WO2009144937A1 - Heat dissipating mechanism for flat display television set - Google Patents

Heat dissipating mechanism for flat display television set Download PDF

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Publication number
WO2009144937A1
WO2009144937A1 PCT/JP2009/002350 JP2009002350W WO2009144937A1 WO 2009144937 A1 WO2009144937 A1 WO 2009144937A1 JP 2009002350 W JP2009002350 W JP 2009002350W WO 2009144937 A1 WO2009144937 A1 WO 2009144937A1
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WO
WIPO (PCT)
Prior art keywords
fan
chassis
fan unit
groove
air
Prior art date
Application number
PCT/JP2009/002350
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French (fr)
Japanese (ja)
Inventor
山西敏弘
南部壮寿
高橋計行
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2008141927A external-priority patent/JP2011166190A/en
Priority claimed from JP2008141926A external-priority patent/JP2011166189A/en
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2009144937A1 publication Critical patent/WO2009144937A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

Definitions

  • the present invention relates to a heat dissipating mechanism for a flat display television that prevents an air cooling fan from rotating due to dust accumulation in a flat display television such as a plasma display television.
  • the heat dissipation mechanism of the conventional plasma display TV uses an axial fan, and air with less dust is taken into the TV casing from the air inlet provided with an air filter, and the electric circuit board, plasma display panel, and chassis that are heat sources (See, for example, Patent Document 1).
  • FIG. 16 shows a heat dissipation mechanism of a conventional plasma display television described in Patent Document 1.
  • a conventional plasma display television includes a plasma display panel 1105, a chassis 1101, a protective glass 1113, an electric circuit board 1107, an axial fan unit 1102, a front cover 1109, and a back cover 1108.
  • the chassis 1101 is a metal plate such as aluminum and holds the plasma display panel 1105 via a heat conductive sheet with an adhesive.
  • the chassis 1101 also holds a plurality of electric circuit boards 1107 on the surface opposite to the mounting surface of the plasma display panel 1105.
  • a group of a chassis 1101, a plasma display panel 1105, and an electric circuit board 1107 is combined with a front cover 1109. Further, the front cover 1109 is combined with the back cover 1108 to constitute a casing of the plasma display television.
  • the back cover 1108 includes an intake port 1118, an air filter 1111, an exhaust port 1110, and a screw fastening boss 1147.
  • the axial fan unit 1102 includes a fan casing 1170, a fan casing 1171, a fan motor, and fan blades.
  • An axial fan unit 1102 shown in FIG. 16 is a suction type fan.
  • the axial fan unit 1102 is attached to a screw fastening boss 1147 provided on the back cover 1108 with a screw 1119.
  • the low temperature air is removed from the air inlet 1118 via the air filter 1111 and is taken into the housing of the plasma display television.
  • the air that has entered the casing of the plasma display television cools the electric circuit board 1107 and the chassis 1101 heated by the plasma display panel 1105. Then, as indicated by an arrow 1156, the air is exhausted from the exhaust port 1110.
  • FIG. 17 is a view showing a heat dissipation mechanism of a plasma display television using the prior art axial fan unit 1102 shown in FIG. 16 as a discharge type.
  • a specific heat source it is more effective to use the axial fan unit 1102 as a suction type.
  • the axial fan unit 1102 is more effective to use the axial fan unit 1102 as a discharge fan in order to dissipate heat of the entire casing of the plasma display television.
  • the plasma display television shown in FIG. 17 has the same components as those in FIG. 16, and includes a plasma display panel 1105, a chassis 1101, an electric circuit board 1107, an axial fan unit 1102, a front cover 1109, and a back cover 1108. It consists of and.
  • FIG. 16 is different from FIG. 16 in that the axial fan unit 1102 is fixed to the chassis 1101 and used as a discharge fan.
  • FIG. 18 is a cross-sectional view of a plasma display television using a centrifugal fan unit.
  • a plasma display television using the centrifugal fan unit 1103 includes a plasma display panel 1105, a chassis 1101, a protective glass 1113, an electric circuit board 1107, a centrifugal fan unit 1103, a front cover 1109, an air duct 1131, a back And a cover 1108.
  • an air duct 1131 is added as compared with the plasma display television of the axial fan unit 1102 in FIG. 16.
  • the centrifugal fan unit 1103 is used as a discharge type fan.
  • the inlets of the centrifugal fan unit 1103 are on both sides of the fan casing 1170 and the fan casing 1171 (see, for example, Patent Document 2).
  • the centrifugal fan unit 1103 is attached to a screw fastening boss 1146 provided on the chassis 1101 with a screw 1119.
  • the air duct 1131 is attached to the outlet of the centrifugal fan unit 1103.
  • the air duct 1131 is attached to a screw fastening boss 1145 provided on the back cover 1108 with a screw 1119.
  • the air duct 1131 guides the air discharged from the centrifugal fan unit 1103 to the exhaust port 1110 of the back cover 1108.
  • the electric circuit board 1107 and the chassis 1101 are cooled, and the warmed air is discharged from the exhaust port 1110 as indicated by an arrow 1156.
  • the dust countermeasures of the axial fan unit 1102 shown in FIGS. 16 and 17 and the centrifugal fan unit 1103 shown in FIG. 18 take advantage of the thick case of the plasma display TV in addition to the air filter 1111.
  • a system is used in which a gap between the casing 1171 and the back cover 1108 and a gap between the fan casing 1170 and the chassis 1101 are made large.
  • FIG. 19A shows the fan air volume with respect to the gap d between the exhaust port of the axial fan unit 1102 and the electric circuit board 1107 shown in FIG.
  • FIG. 19B shows the fan air volume with respect to the gap h between the air inlet of the axial fan unit 1102 and the chassis 1101 shown in FIG.
  • FIG. 19A shows the fan air volume with respect to the gap d between the exhaust port of the axial fan unit 1102 and the electric circuit board 1107 shown in FIG.
  • FIG. 19B shows the fan air volume with respect to the gap h between the air inlet of the axial fan unit 1102 and the chassis 1101 shown in FIG.
  • 19C shows the sum (s1 + s2) of the clearance s1 between the chassis-side intake port of the centrifugal fan unit 1103 and the chassis 1101 and the clearance s2 between the back cover-side intake port of the centrifugal fan unit 1103 and the back cover 1108 shown in FIG. ),
  • the fan air volume There, these fans described above have, as common specifications, a fan blade diameter of 80 mm, a fan thickness of 15 mm, and a fan drive voltage of 5V.
  • the fan air cooling capacity is reduced in proportion to the decrease in the fan air volume.
  • the distance between the plasma display panel 1105 which is a main heating element and the electric circuit board 1107 is shortened, and the heat generation density per unit volume of the television casing is increased.
  • the temperature is higher than that of a plasma display television having a conventional thickness. Therefore, in order to further reduce the thickness of the flat display television, a cooling mechanism with high air cooling capability is required.
  • the first factor that dust tends to accumulate is that the gap between the air cooling fan unit and the chassis 1101 or the back cover 1108 becomes narrow.
  • the 2nd factor with which dust tends to accumulate is that the space
  • the air filter 1111 has a thickness of 1 to 2 mm and cannot be ignored as a flow resistance. Further, the air filter 1111 cannot be used from the viewpoint of a thinner design.
  • the third factor that dust is likely to accumulate is the abolition of the air filter 1111. Therefore, when the casing of the flat display television is thinned, the factor that dust tends to accumulate increases.
  • the air cooling fan unit when reducing the thickness of a flat panel display TV case, the air cooling fan unit has a new problem of improving the fan air cooling capacity while reducing the fan thickness and being resistant to dust. ing.
  • the present invention is a heat dissipating mechanism for a flat panel display TV provided with an air cooling fan unit between a metal chassis of the flat panel display TV and a back cover.
  • the air cooling fan unit uses the chassis or the back cover as a motor base part.
  • a fan motor installed on the motor base, and fan blades concentric with the rotation axis of the fan motor.
  • the chassis or the back cover is a motor base portion for fixing the air cooling fan unit.
  • This configuration makes it possible to make a large gap between the air cooling fan unit and the chassis and a gap between the air cooling fan unit and the back cover. Therefore, the gap around the air cooling fan unit is increased, and dust is less likely to accumulate.
  • the present invention is a heat dissipating mechanism for a flat display television provided with an air cooling fan unit between a metal chassis of the flat display television and a back cover, and the chassis faces the air inlet of the air cooling fan unit. Further, a groove concentric with the rotating shaft of the fan motor may be provided.
  • FIG. 1 is a cross-sectional view of a plasma display television using an axial fan unit in a heat dissipation mechanism for a flat display television according to Embodiment 1 of the present invention.
  • FIG. 2 is a perspective view for explaining a dimensional relationship between an annular groove provided in the chassis and an axial fan unit in the first embodiment of the present invention.
  • FIG. 3 is an exploded perspective view of the coaxial flow fan unit according to Embodiment 1 of the present invention before it is assembled to the chassis.
  • FIG. 4 is an exploded perspective view showing a second example of the shape of the groove provided in the chassis according to the first embodiment of the present invention.
  • FIG. 1 is a cross-sectional view of a plasma display television using an axial fan unit in a heat dissipation mechanism for a flat display television according to Embodiment 1 of the present invention.
  • FIG. 2 is a perspective view for explaining a dimensional relationship between an annular groove provided in the chassis and an axial fan unit in the first embodiment
  • FIG. 5 is a developed perspective view showing a third example of the shape of the groove provided in the chassis according to the first embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of a plasma display television using a centrifugal fan unit in the heat dissipation mechanism for a flat display television according to Embodiment 2 of the present invention.
  • FIG. 7 is an exploded perspective view before assembling the centrifugal fan unit on the groove provided in the chassis in the flat panel display TV heat dissipating mechanism according to Embodiment 2 of the present invention.
  • FIG. 8 is a cross-sectional view of a plasma display television using a centrifugal fan unit in the heat dissipation mechanism for a flat display television according to Embodiment 3 of the present invention.
  • FIG. 9 is a cross-sectional view of the fan unit for explaining the components of the centrifugal fan unit according to Embodiment 3 of the present invention.
  • FIG. 10 is an exploded perspective view of the fan motor of the centrifugal fan unit according to the third embodiment of the present invention as components.
  • FIG. 11 is a perspective view in which the fan rotating portion of the centrifugal fan unit according to Embodiment 3 of the present invention is disassembled into components.
  • FIG. 12 is a perspective view before assembling the centrifugal fan unit, the air duct, the outer fan casing, and the plate-shaped fan casing in the third embodiment of the present invention into the chassis.
  • FIG. 10 is an exploded perspective view of the fan motor of the centrifugal fan unit according to the third embodiment of the present invention as components.
  • FIG. 11 is a perspective view in which the fan rotating portion of the centrifugal fan unit according to Embodiment 3 of the present invention is disassembled into components.
  • FIG. 12 is a perspective
  • FIG. 13 is a perspective view when the centrifugal fan unit according to Embodiment 3 of the present invention is assembled and the back cover is attached to the chassis.
  • FIG. 14 is a cross-sectional view of a plasma display television using a centrifugal fan unit in a heat dissipation mechanism for a flat display television according to Embodiment 4 of the present invention.
  • FIG. 15 is a cross-sectional view of a plasma display television for explaining the components of the centrifugal fan unit according to Embodiment 4 of the present invention.
  • FIG. 16 is a cross-sectional view of a plasma display television using an axial fan unit in the prior art as a suction fan.
  • FIG. 17 is a cross-sectional view of a plasma display television using an axial fan unit in the prior art as a discharge fan.
  • FIG. 18 is a cross-sectional view of a plasma display television using a centrifugal fan unit in the prior art.
  • FIG. 19A is a diagram illustrating the relationship of the fan air volume with respect to the gap between the exhaust port of the axial fan unit and the electric circuit board in the prior art.
  • FIG. 19B is a diagram illustrating the relationship of the fan air volume with respect to the gap between the air inlet and the chassis of the axial fan unit in the prior art.
  • 19C is a diagram illustrating the relationship of the fan air volume with respect to the sum of the clearance between the chassis-side intake port and the chassis of the centrifugal fan unit and the clearance between the back cover-side intake port and the back cover of the centrifugal fan unit in the prior art. .
  • Embodiment 1 of the present invention will be described with reference to FIGS. An example in which the flat panel display TV heat dissipation mechanism according to the present embodiment is applied to a plasma display TV will be described.
  • FIG. 1 is a cross-sectional view of a plasma display television using an axial fan unit 2 in the heat dissipation mechanism for a flat display television according to Embodiment 1 of the present invention.
  • FIG. 2 is a perspective view for explaining the dimensional relationship between the annular groove 32 provided in the chassis 1 and the axial fan unit 2.
  • FIG. 3 is an exploded perspective view of the axial flow fan unit 2 according to the first embodiment of the present invention before the chassis 1 is assembled.
  • FIG. 4 is an exploded perspective view showing a second example of the shape of the groove 36 provided in the chassis 1.
  • FIG. 5 is an exploded perspective view showing a third example of the shape of the groove 37 provided in the chassis 1.
  • the plasma display television in the heat dissipation mechanism for a flat display television includes a protective glass 13, a front cover 9, a back cover 8, a chassis 1, and a plasma display panel 5.
  • the electric circuit board 7, the sponge cushion 80, and the axial fan unit 2 are configured.
  • the front cover 9 is made of metal such as aluminum.
  • the front cover 9 is fixed to the aluminum chassis 1 with screws 19 and is combined with the iron back cover 8 at the same time.
  • the protective glass 13 is attached to the front cover 9 with an auxiliary metal fitting (not shown).
  • the electric circuit board 7 is mounted on the plasma display TV in a size of about 6 to 10 in total.
  • the breakdown includes a control circuit for performing image processing and the like, a television tuner, a power supply board, and the like.
  • the back cover 8 is made of an iron-based steel plate and includes an intake port 18 and an exhaust port 10.
  • the axial fan unit 2 includes a fan motor 4, fan blades 29, a plate-shaped fan casing 70, and an outer fan casing 71.
  • the plate-like fan casing 70 and the surrounding fan casing 71 are provided with an annular intake port having a fan casing hole inner radius r1 and a fan casing hole outer radius r2.
  • the plate-shaped fan casing 70 is screwed to the screw-fastening boss 45 on the chassis 1 with screws 19.
  • the screw fastening boss 45 is made of aluminum and is manufactured by a caulking method. That is, the screw-fastening boss 45 is manufactured by caulking a stepped boss, which is knurled at the tip, toward a preliminary hole provided in advance in the chassis 1 (not shown).
  • the groove 32 is an annular recess of the chassis 1 and is provided on the side facing the back cover 8.
  • the groove 32 has a chassis groove inner radius r3 and a chassis groove outer radius r4.
  • the groove 32 is formed by simultaneous processing when the chassis 1 is pressed.
  • the thickness of the chassis 1 is 2 mm, and the depth of the groove 32 is 0.7 mm.
  • the depth of the groove 32 is deep, it is effective for preventing dust accumulation. However, if the depth of the groove 32 is deep, the mechanical strength of the chassis 1 is lowered.
  • the chassis 1 is at a high temperature of 80 ° C. or higher while the plasma display television is drawing. Therefore, it is not preferable to deepen the groove 32 in order to reduce the thermal stress generated in the chassis 1.
  • the depth of the groove 32 is 10% to 50% of the thickness of the chassis 1. That is, the volume of the groove 32 is 10% or more and 50% or less of the product of the area of the outer diameter circle of the groove 32 and the thickness of the chassis 1.
  • the depth of the groove 32 is more preferably 30% or more and 50% or less of the thickness of the chassis 1 from the viewpoint of dust accumulation prevention and the mechanical strength of the chassis 1.
  • the center of the annular shape of the groove 32 is arranged so as to be concentric with the rotational axis of the fan motor 4 when the axial fan unit 2 is installed in the casing of the plasma display television. Therefore, a screw fastening boss 45 for fixing the axial fan unit 2 is disposed on the chassis 1. That is, the chassis 1 has a groove 32 concentric with the rotation shaft of the fan motor 4 on the side facing the intake port of the axial fan unit 2 as an air cooling fan unit.
  • the radius of each member is formed so that r3 ⁇ r1 ⁇ r2 ⁇ r4. Therefore, the air passing through the gap between the chassis 1 and the back cover 8 in the plasma display television can pass through the inside of the axial fan unit 2 and be exhausted from the exhaust port 10.
  • r1 is 15 mm
  • r2 is 30 mm
  • r3 is 10 mm
  • r4 is 35 mm. That is, the chassis groove outer radius r4, which is the outer diameter of the groove, is set to be larger than the fan casing hole outer radius r2, which is the outer diameter of the air inlet of the air-cooled fan unit.
  • the material of the sponge cushion 80 is urethane foam.
  • the shape of the sponge cushion 80 is a ring.
  • the inner radius of the sponge cushion 80 is equal to the outer radius r2 of the fan casing hole, and the outer radius of the sponge cushion 80 is several mm larger than the outer radius of the axial fan unit 2.
  • the sponge cushion 80 has a thickness of 2 to 5 mm.
  • the sponge cushion 80 is affixed to the outer fan casing 71 with double-sided tape, and closes the gap between the outer fan casing 71 and the back cover 8.
  • the gap between the plate-shaped fan casing 70 and the chassis 1 is widened by the depth of the groove 32 as compared with the conventional example. Therefore, the channel resistance in the air flow in the plasma display television is reduced. As a result, the air cooling capability of the air cooling fan unit is improved. At the same time, the dust is less likely to accumulate.
  • the cold air sucked from the air inlet 18 is heated by the heat generating electric circuit board 7 and the plasma display panel as indicated by the arrow 55 by the rotation of the axial fan unit 2.
  • the chassis 1 is cooled.
  • the air heated by this cooling action continues to rise and advances to the gap between the groove 32 and the plate-shaped fan casing 70 immediately before the axial fan unit 2.
  • the air passes through the groove 32 and enters the axial fan unit 2 from the inlet of the fan casing hole inner radius r1 and the fan casing hole outer radius r2 provided in the plate fan casing 70.
  • the air in the axial fan unit 2 is discharged from the exhaust port 10 as indicated by an arrow 56.
  • the groove 32 is provided in the chassis 1 to increase the gap between the axial fan unit 2 and the chassis 1. As a result, dust accumulation on the axial fan unit 2 can be prevented, and the problem that the fan motor 4 does not rotate when starting the thin casing plasma display television can be solved.
  • the groove 32 has an annular shape, but the groove may have a circular shape.
  • FIG. 4 shows a second example of the groove shape formed in the chassis 1.
  • the groove 36 has a circular shape in which the rotation center of the axial fan unit 2 is concentric.
  • the chassis groove radius r3 is zero.
  • the groove 32 has an annular shape.
  • the groove may have a plurality of fan shapes that radially extend with the rotation axis of the axial fan unit 2 being concentric.
  • FIG. 5 shows a third example of the groove shape formed in the chassis 1.
  • the groove 37 is a fan-shaped recess having the rotation axis of the axial fan unit 2 concentric, and a plurality of grooves 37 are arranged in the circumferential direction on the chassis 1.
  • the chassis groove inner radius r3 and the chassis groove outer radius r4 of the groove 37 are the fan casing hole inner radius r1 and the fan casing hole outer radius r2 of the air inlets of the plate fan casing 70 and the surrounding fan casing 71 of the axial fan unit 2, respectively.
  • the portion of the chassis 1 that is not 2 mm thick between the plurality of fan-shaped grooves 37 is larger than the area of the fan-shaped grooves 37, that is, the fan-shaped grooves 37 have an area of 50% or less.
  • the mechanical strength of 1 has no practical problem. Therefore, the groove 37 may be a through hole instead of a recess.
  • the present invention can also be applied to flat display televisions such as liquid crystal display televisions and field emission televisions.
  • the axial fan unit 2 is arranged in a chassis that holds the display panel in the housing.
  • Embodiment 2 A second embodiment of the present invention will be described with reference to FIGS. An example in which the flat panel display TV heat dissipation mechanism according to this embodiment is applied to a plasma display TV will also be described. About the same component as Embodiment 1, the same code
  • FIG. 6 is a cross-sectional view of a plasma display television using the centrifugal fan unit 3 in the heat dissipation mechanism for a flat display television according to Embodiment 2 of the present invention.
  • FIG. 7 is a developed perspective view of the centrifugal fan unit 3 in the heat dissipating mechanism for a flat display television according to the second embodiment of the present invention before the chassis 1 is assembled.
  • the difference between the first embodiment and the second embodiment is that the air-cooling fan unit is not the axial fan unit 2 but the double-sided intake centrifugal fan unit 3, the air duct 31 is added, and the back cover 8 and a groove 33 added thereto.
  • the plasma display TV in the heat dissipation mechanism for a flat display TV includes a protective glass 13, a front cover 9, a back cover 8, a chassis 1, a plasma display panel 5, an electric circuit board 7,
  • the sponge cushion 81, the air duct 31, and the centrifugal fan unit 3 are configured.
  • the back cover 8 is made of an iron-based steel plate and includes an intake port 18, an exhaust port 10, and a groove 33.
  • the groove 32 is an annular recess of the chassis 1 and is provided on the side facing the back cover 8.
  • the groove 32 has a chassis groove inner radius r3 and a chassis groove outer radius r4.
  • the groove 32 is formed by simultaneous processing when the chassis 1 is pressed.
  • the thickness of the chassis 1 is 2 mm, and the depth of the groove 32 is 0.7 mm.
  • the groove 33 is an annular concave portion of the back cover 8 and is provided on the side facing the chassis 1.
  • the groove 33 has a back cover groove inner radius r5 and a back cover groove outer radius r6.
  • the back cover 8 has a groove 33 concentric with the rotating shaft of the fan motor 4 on the side facing the air inlet of the centrifugal fan unit 3. The groove 33 is formed by simultaneous processing when the back cover 8 is pressed.
  • the plate thickness of the back cover 8 is 2 mm, and the depth of the groove 33 is 0.7 mm. That is, the back cover groove outer radius r6, which is the outer diameter of the groove, is set to be larger than the fan casing hole outer radius r2, which is the outer diameter of the air inlet of the air cooling fan unit.
  • the air duct 31 is molded from a plastic material such as polycarbonate.
  • the air duct 31 is fixed to a screw fastening boss 46 on the back cover 8 by a screw 19.
  • the air duct 31 guides the air that has exited from the discharge port 49 of the centrifugal fan unit 3 to the exhaust port 10 of the back cover 8.
  • the material of the sponge cushion 81 is urethane foam.
  • the shape of the sponge cushion 81 is rectangular.
  • the dimension of the sponge cushion 81 corresponds to the outlet 39 of the air duct 31 and is affixed to the air duct 31 with a double-sided tape.
  • the space of the inlet of the centrifugal fan unit 3 is widened by the depth of the groove 32 and the groove 33.
  • the flow resistance in the air flow in the plasma display television is further reduced, and the air cooling capability is improved.
  • dust accumulation on the centrifugal fan unit 3 can be prevented, and the problem that the fan motor 4 does not rotate when starting the thin casing plasma display television can be solved.
  • the air that has been divided into two parts is the air inlet from the fan casing hole inner radius r1 to the fan casing hole inner radius r2 of the plate fan casing 70 and the fan casing hole inner radius r1 of the outer fan casing 71, respectively.
  • the centrifugal fan unit 3 is entered from the air inlet having the inner radius r2. Then, the air that has entered the centrifugal fan unit 3 passes through the centrifugal fan unit 3 from the discharge port 49 and proceeds to the blower duct 31. Finally, the air is exhausted from the exhaust port 10 of the back cover 8 connected to the discharge port 39 of the blower duct 31 as indicated by an arrow 56.
  • the plasma display television chassis 1 and the back cover 8 in the flat panel display television heat dissipating mechanism according to the present embodiment are provided with the grooves 32 and 33, respectively, to increase the clearance with the centrifugal fan unit 3.
  • dust accumulation on the centrifugal fan unit 3 can be prevented, and the problem that the fan motor 4 does not rotate when the plasma display television as the flat display television is started can be solved.
  • FIG. 8 is a cross-sectional view of a plasma display television using the centrifugal fan unit 103 in the heat dissipation mechanism for a flat display television according to Embodiment 3 of the present invention.
  • FIG. 9 is a cross-sectional view illustrating components of centrifugal fan unit 103 according to Embodiment 3 of the present invention.
  • FIG. 10 is an exploded perspective view of the fan motor 104 of the centrifugal fan unit 103 according to the third embodiment of the present invention as components.
  • FIG. 11 is an exploded perspective view of the fan rotating unit 112 of the centrifugal fan unit 103 according to the third embodiment of the present invention.
  • FIG. 12 is a perspective view before the centrifugal fan unit 103, the air duct 131, the outer fan casing 130, and the plate-shaped fan casing 134 according to the third embodiment of the present invention are assembled to the chassis 101.
  • FIG. 13 is a perspective view when the centrifugal fan unit 103 according to the third embodiment of the present invention is assembled and the back cover 108 is attached to the chassis 101.
  • the plasma display television includes a protective glass 113, a front cover 109, a back cover 108, a chassis 101, a front panel 106, a back panel 105, an electric circuit board 107, and an external fan.
  • the casing 130, the air duct 131, the spacer 144, and the centrifugal fan unit 103 are configured.
  • the chassis 101 is made of metal such as aluminum and has a thickness of 2 mm. Two pieces of a back panel 105 and a front panel 106 of the plasma display panel are attached to the chassis 101 by a heat conductive sheet (not shown) with an adhesive.
  • the groove 132 is an annular recess of the chassis 1 and is carved on the surface facing the back cover 108. The depth of the groove 132 is 0.7 mm. The depth of the groove 132 is less than half the plate thickness of the chassis 101, and there is no problem in strength.
  • the groove 132 is pressed into a concave shape when the chassis 101 is molded. As shown in FIG.
  • the central axis of the annular ring of the groove 132 and the rotation center of the centrifugal fan unit 103 are arranged on the chassis 101 so as to be concentric.
  • the chassis 101 is sandwiched between the front panel 106 and the back panel 105 that generate heat and the electric circuit board 107 and is heated to a high temperature state.
  • the chassis 101 includes a screw fastening boss 141 for fixing the fan motor 104.
  • the screw-fastening boss 141 is formed by fixing a stepped boss, which is knurled at the tip, to a preliminary hole provided in the chassis 101 by a caulking method (not shown).
  • the chassis 101 is provided with a screw fastening boss 140 for fixing the air duct 131 and a screw fastening boss 142 for fixing the plate-shaped fan casing 134 by a caulking method.
  • the material of the above-described three types of screw fastening bosses 140, 141, 142 is aluminum, and a preliminary hole is carved for a screw fastening operation.
  • the screw fastening bosses 140, 141, and 142 are integrally formed with the chassis 101, but may be additional parts on the flat chassis 101.
  • the aluminum front cover 109 is fixed to the chassis 101 with screws 119. Further, a protective glass 113 is attached to the front cover 109 with auxiliary metal fittings (not shown).
  • the back cover 108 is made of metal such as iron and is combined with the front cover 109. Further, the back cover 108 includes an intake port 118 and an exhaust port 110.
  • the electric circuit board 107 is mounted on the plasma display television about 6 to 10 in total.
  • the breakdown includes a control circuit for performing image processing and the like, a tuner, a power supply board, and the like.
  • the spacer 144 is an aluminum ring plate having a thickness of 0.5 mm, and holes through which screws 119 pass are formed at three locations on the outer periphery.
  • the spacer 144 is used for positioning the chassis 101 and the centrifugal fan unit 103 in the plasma display television case.
  • the centrifugal fan unit 103 includes a fan motor 104 and a fan rotating unit 112.
  • the fan motor 104 includes a motor fixing part 121, a motor circuit board 122, a coil 123, an iron core 124, a radial bearing part 127, a thrust bearing part 135, a radial bearing insertion hole 165, and an iron core mounting cylindrical surface 166. And a motor circuit board receiving surface 167.
  • the radial bearing portion 127 employs an oil-impregnated fluid bearing system.
  • the motor fixing portion 121 is first formed by machining an aluminum round bar into a flange having a plurality of cylindrical surfaces with different diameters.
  • the motor fixing portion 121 is made by simultaneously machining the radial bearing insertion hole 165 and the iron core mounting cylindrical surface 166 from the aluminum round bar.
  • a circular recess is cut out on the bottom surface of the motor fixing portion 121.
  • the thrust bearing part 135 of a coin-type magnet is fixed to an above-mentioned circular recessed part with an adhesive agent.
  • the lowermost flange of the motor fixing part 121 has three holes through which screws 119 pass. Subsequently, the radial bearing 127 is inserted into the radial bearing insertion hole 165 and fixed with an adhesive. Since the radial bearing 127 is a material obtained by sintering cast iron, there are many gaps in the material, and lubricating oil is held in these gaps.
  • the motor circuit board 122 is fixed to the motor circuit board receiving surface 167 with an adhesive.
  • the iron core 124 is made of SS400, for example. Then, the iron core 124 is inserted into the iron core mounting cylindrical surface 166 of the motor fixing portion 121, and the height is adjusted and fixed with an adhesive. A copper wire coil 123 is wound around the iron core 124. Thus, the fan motor 104 is completed.
  • the fan rotating unit 112 includes a fan blade 129, a magnet 125, a back yoke 126, and a rotating shaft 128. Inside the fan blade 129, the magnet 125, the back yoke 126 made of SS400, and the rotating shaft 128 made of SUS430 are aligned on the same core and fixed with an adhesive. On the cylindrical surface of the rotating shaft 128, a substantially U-shaped thin dynamic pressure groove is carved by a rolling method.
  • the rotating shaft 128 of the fan rotating portion 112 thus configured is fitted and inserted into the hole of the radial bearing portion 127 as shown in FIG.
  • the lubricating oil held on the radial bearing 127 oozes out from the gap between the sintered materials and enters the substantially dog-shaped dynamic pressure groove of the rotating shaft 128 to form a lubricating oil film.
  • the motor rotating portion 112 rotates, a large hydraulic pressure is generated in the lubricating oil film, and the radial bearing portion 127 and the rotating shaft 128 are kept in non-contact.
  • the rotating shaft 128 is a magnetic SUS304. Further, the thrust bearing portion 135 on the bottom surface of the motor fixing portion 121 is a magnet. Therefore, the fan rotating portion 112 including the rotating shaft 128 does not come out of the radial bearing portion 127 due to the suction force of the thrust bearing portion 135.
  • the air duct 131 is formed of a plastic material such as polycarbonate.
  • the air duct 131 includes a suction port 138, a discharge port 139, and a plate-shaped fan casing 134.
  • the air duct 131 is fixed to a screw fastening boss 140 for fixing the air duct provided on the chassis 101 with screws 119.
  • a screw tightening boss 140 is disposed so that the central axis of the hole of the suction port 138 is concentric with the rotation shaft 128 when the fan rotation unit 112 is attached to the chassis 101. That is, the rotating shaft 128 of the fan motor 104 and the fan blade 129 are concentric.
  • the shape of the suction port 138 provided in the center of the plate-shaped fan casing 134 has an outer radius r8 and an inner radius r7.
  • the radius of the fan blade 129 is larger than the inner radius r7 of the suction port 138, and the outer radius r8 of the suction port 138. Smaller than.
  • the screw through hole of the spacer 144 is placed on the screw fastening boss 141 of the chassis 101 so as to match. Further, the screw through hole of the fan motor 104 is placed on the screw fastening boss 141. Finally, the fan motor 104 and the spacer 144 are fixed to the chassis 101 with screws 119. That is, the centrifugal fan unit 103 as an air cooling fan unit uses the chassis 101 as a motor base portion for fixing the fan motor 104. And the fan motor 104 is installed in the motor base part.
  • the surrounding fan casing 130 is a substantially U-shaped curved plate having an arc shape around the position of the rotation shaft 128 when the fan motor 104 is attached to the chassis 101.
  • the surrounding fan casing 130 is molded of plastic such as polycarbonate.
  • the arc portion of the outer fan casing 130 is located on the opposite side of the air duct 131 with the motor rotation shaft 128 interposed therebetween.
  • the outer fan casing 130 is fixed to a screw fastening boss 142 provided on the chassis 101 with a screw 119 (see FIG. 12).
  • the inner radius of the outer fan casing 130 is the same as the outer radius r8 of the plate fan casing 134 so as to be combined with the plate fan casing 134 on the chassis 101 without a gap.
  • the centrifugal fan unit 103 as an air cooling fan unit includes a plate-shaped fan casing and an outer fan casing 130.
  • the plate-shaped fan casing 134 is disposed between the chassis 101 and the fan blades 129 and is fixed to the motor base portion.
  • the surrounding fan casing 130 surrounds the outer periphery of the fan blade 129 in the direction perpendicular to the rotation axis of the fan blade 129.
  • the plate-shaped fan casing 134 has a suction port 138 that sucks air by rotation of the fan blades 129.
  • the screw through hole of the spacer 144 is placed on the screw fastening boss 141 of the chassis 101 so as to match. Further, the screw through hole of the fan motor 104 is placed on the screw fastening boss 141. Finally, the fan motor 104 and the spacer 144 are fixed to the chassis 101 with screws 119. Subsequently, the air duct 131 is placed on the screw fastening boss 141 on the chassis 101 while the suction port 138 of the air duct 131 is passed through the fan motor 104. Then, the air duct 131 is fixed to the chassis 101 with screws 119.
  • the rotating shaft 128 of the fan rotating portion 112 is inserted into the radial bearing portion 127 of the fan motor 104.
  • the outer fan casing 130 is fixed to the screw fastening boss 142 on the chassis 101 with screws 119 so as to be combined with the air duct 131 connected to the exhaust hole 110 of the back cover 108.
  • FIG. 13 is a schematic perspective view of a plasma display television heat dissipating mechanism using the centrifugal fan unit 103 assembled on the chassis 101.
  • Above the chassis 101 is an iron back cover 108, which is fastened to the chassis 101 with screws 119.
  • the exhaust port 110 of the back cover 108 is fitted with a discharge port 139 provided in the air duct 131 and becomes a flow path for exhausting air heated in the plasma display television.
  • a sponge cushion (not shown) is sandwiched in the gap to close the gap.
  • a plurality of centrifugal fan units 103 are installed on the upper part of the plasma display television and on the back cover side of the chassis 101.
  • the electric circuit board 107 is installed below the centrifugal fan unit 103.
  • the fan rotating unit 112 of the centrifugal fan unit 103 rotates, cold air enters the plasma display television from the air inlet 118 of the back cover 108 as indicated by an arrow 155.
  • the cold air rises between the chassis 101 and the back cover 108 toward the centrifugal fan unit 103.
  • the electric circuit board 107 and the chassis 101 generating heat are being cooled in the process of rising air, the air rises toward the centrifugal fan unit 103.
  • the chassis 101 has a groove concentric with the rotating shaft 128 of the fan motor 104 on the side facing the suction port 138 of the centrifugal fan unit 103. Therefore, the air that has reached the centrifugal fan unit 103 cannot rise straight by the surrounding fan casing 130, rises through the gap between the plate-like fan casing 134 and the groove 132, and enters the centrifugal fan unit 103 from the suction port 138 shown in FIG. Proceed inside. The air finally passes through the outlet 139 of the air duct 131 while turning along the inner wall of the outer fan casing 130 by the rotation of the fan rotating portion 112. That is, the fan blade 129 is a centrifugal fan system that discharges air in the centrifugal direction from the center of rotation. Finally, the air is exhausted out of the plasma display television from the exhaust port 110 of the back cover 108 shown in FIG.
  • the centrifugal fan unit 103 is configured using the chassis 101 and the back cover 108 of the plasma display television. As a result, compared with the conventional centrifugal fan unit 1103 shown in FIG. 18, the thickness of the fan casing 1171 is reduced, so that there is a gap between the fan rotating portion 112 and the stationary components (chassis 101, back cover 108). Become wider.
  • the gap between the fan blades 1172 and the fan casing 1170 provided in the conventional centrifugal fan unit 1103 is also unnecessary.
  • the plate-shaped fan casing 134 in FIG. 9 does not have to be the same as the height of the mounting surface of the screw fastening boss 141. Further, the plate-shaped fan casing 134 is embedded in the groove 132. As a result, the gap between the fan rotating unit 112 and the plate-shaped fan casing 134 that is the stationary part of the present embodiment is wider than the gap between the rotating fan blades 1172 and the fan casing 1170 that is the stationary part of the prior art. Can do.
  • the back cover 108 is used as a substitute for the fan casing 1171 of the conventional centrifugal fan unit 1103 shown in FIG. Therefore, the fan casing 1171 shown in FIG. 18 is also unnecessary. As a result, the gap between the fan blades 29 and the back cover 8 that is a stationary part can be made wider than the gap between the rotating fan blades 1172 and the fan casing 1170 that is a stationary part in the prior art.
  • the approximate value of the clearance obtained by the centrifugal fan unit 103 of this embodiment is about 1.5 mm thick of the fan casing 1171, the fan blades 1172 and the fan casing 1171.
  • the total gap of 0.7 mm and the gap of 0.7 mm between the chassis 101 and the fan casing 1170 is about 2.9 mm.
  • a new gap of 2.9 mm is important in design.
  • the spacer 144 is for adjusting the gap between the plate-shaped fan casing 134 and the fan rotating portion 112, and the thickness of the spacer 144 is not related to the total gap of 2.9 mm.
  • the gap between the fan rotating portion 112 and the plate-shaped fan casing 134 and the gap between the fan rotating portion 112 and the back cover 108 are enlarged.
  • the gap around the fan rotating portion 112 can be enlarged, and when starting a plasma display television with a thin casing, a centrifugal fan The problem that dust accumulates in the unit 103 and the fan rotating unit 112 does not rotate can be solved.
  • the present invention can also be applied to flat display televisions such as liquid crystal display televisions and field emission televisions.
  • the centrifugal fan unit is arranged in the chassis that holds the display panel in the housing.
  • FIGS. 10 to 11 are also used.
  • An example in which the flat panel display TV heat dissipation mechanism according to this embodiment is applied to a plasma display TV will also be described.
  • FIG. 14 is a sectional view of a plasma display television using the centrifugal fan unit 103 according to Embodiment 4 of the present invention.
  • FIG. 15 is a cross-sectional view showing a configuration of centrifugal fan unit 103 according to Embodiment 4 of the present invention.
  • the difference between the third embodiment and the fourth embodiment is that the centrifugal fan unit 103 is assembled to the back cover 108 and a work hole 115 for performing the electrical wiring 150 is added to the back cover 108. That is, the centrifugal fan unit 103 as an air cooling fan unit uses the back cover 108 as a motor base portion to which the fan motor 104 is fixed.
  • Other constituent elements are denoted by the same reference numerals as those in the third embodiment, and description thereof may be omitted.
  • the plasma display television includes a protective glass 113, a front cover 109, a back cover 108, a chassis 101, a front panel 106, a back panel 105, an electric circuit board 107, and an electric wiring 150.
  • the connector convex portion 151, the connector concave portion 152, the surrounding fan casing 130, the blower duct 131, and the centrifugal fan unit 103 is also included.
  • the centrifugal fan unit 103 includes a fan motor 104 and a fan rotating unit 112 as shown in FIG.
  • the fan motor 104 has the same configuration as that shown in FIG. 10, and includes a motor fixing part 121, a motor circuit board 122, a coil 123, an iron core 124, a radial bearing part 127, a thrust bearing 135, and a radial bearing insertion hole 165. And an iron core mounting cylindrical surface 166 and a motor circuit board receiving surface 167.
  • the radial bearing 127, the motor circuit board 122, the iron core 124, the coil 123, and the thrust bearing 135 are each attached to the motor fixing part 121 with an adhesive.
  • the fan motor 104 is attached with a screw 119 to a screw fastening boss 143 fixed to the back cover 108 by a caulking method.
  • the screw fastening boss 143 is fixed to the back cover 108 so as to be located inside the fan rotating portion 112 when the centrifugal fan unit 103 is attached to the casing of the plasma display television.
  • the fan rotating unit 112 has the same configuration as that of FIG. 11 and includes a fan blade 129, a magnet 125, a back yoke 126, and a rotating shaft 128. Inside the fan blade 129, the magnet 125, the back yoke 126, and the rotating shaft 128 are aligned so as to be concentric, and are attached to the fan blade 129 with an adhesive.
  • the fan rotating part 112 including the rotating shaft 128 is fitted and inserted into the radial bearing part 127 attached to the fan motor 104.
  • the rotating shaft 128 is a magnetic SUS304, and the thrust bearing portion 135 is a magnet. Therefore, the fan rotating unit 112 does not come out of the fan motor 104 by the suction force of the thrust bearing unit 135.
  • a connector projection 151 is attached to the tip of the electric wiring 150.
  • a connector recess 152 is provided on the electric circuit board 107 as a pair of connector protrusions 151. And these two connectors are fitted and electrically connected.
  • the work hole 115 is a hole having a diameter of 3 cm for performing the connector fitting operation, and is closed by the seal 114 when the fitting operation is completed.
  • the air duct 131 includes a suction port 138, a discharge port 139, and a plate-shaped fan casing 134.
  • the air duct 131 guides the air discharged from the centrifugal fan unit 103 to the exhaust port 110.
  • the inner diameter of the suction port 138 is made smaller than the diameter of the fan rotation unit 112 so that air is sucked into the rotation center of the centrifugal fan unit 103.
  • a gap between the discharge port 139 and the exhaust port 110 is generated due to component tolerance and assembly tolerance. In order to close the gap, a sponge cushion (not shown) is sandwiched between the discharge port 139 and the exhaust port 110.
  • the groove 132 is an annular concave portion of the back cover 8 and is carved on the surface on the chassis 101 side.
  • the center axis of the ring of the groove 132 is aligned with the position of the rotation shaft 128 when the centrifugal fan unit 103 is installed on the back cover 108.
  • the depth of the annular recess of the groove 132 was set to 0.7 mm as a category that does not hinder the mechanical strength of the chassis 101.
  • the outer fan casing 130 is a substantially U-shaped curved plate having an arc shape around the rotating shaft 128 of the centrifugal fan unit 103 as in the third embodiment.
  • the arc portion of the outer fan casing 130 is located on the opposite side of the air duct 131 with the rotating shaft 128 interposed therebetween.
  • the outer fan casing 130 is fixed to the screw fastening boss 142 with a screw 119.
  • the centrifugal fan unit 103 is configured using the back cover 108 and the chassis 101 of the plasma display television.
  • the fan casing 1170 is reduced as compared with the prior art centrifugal fan unit 1103 shown in FIG. 18, so that a new gap is obtained in the casing of the plasma display television.
  • the position of the screw fastening boss 1145 for attaching the motor fixing portion 1173 to the chassis 1101 is outside the rotating fan blade 1172. Therefore, it is necessary to extend the plate of the fan casing 1170 from the motor fixing portion 1173 to the mounting position on the chassis 1101.
  • the screw fastening boss 143 for attaching the motor fixing part 121 and the back cover 108 can be arranged inside the fan rotating part 112. Therefore, the fan casing 1170 shown in FIG. 18 is not necessary. As a result, the gap between the fan rotating portion 112 and the plate-shaped fan casing 134 and the gap between the fan rotating portion 112 and the back cover 108 are widened. Since the approximate value of these gaps is 2.9 mm, which is the same as in the third embodiment, description thereof is omitted. In this way, since the gap around the fan rotation unit 112 is enlarged, dust does not collect in the centrifugal fan unit 103 when starting up the plasma display television, so that the problem that the fan rotation unit 112 does not rotate can be solved.
  • the heat dissipating mechanism for a flat display television can increase the gap between the chassis and the air cooling fan unit or the gap between the back cover and the air cooling fan unit. Therefore, it is possible to solve the problem that dust accumulates in the gaps and the air cooling fan cannot rotate, and the present invention is particularly useful for a thin plasma display television.

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Abstract

A heat dissipating mechanism for a flat display television set is provided with an air-cooling fan unit between a metal chassis and a back cover of the flat display television set.  The chassis faces an inlet port of the air-cooling fan unit and has a groove concentric with the rotating axis of a fan motor.  A large space is taken for a space between the air-cooling fan unit and the chassis and that between the air-cooling fan unit and the back cover.

Description

平面型ディスプレイテレビ用放熱機構Heat dissipation mechanism for flat panel display TV
　本発明は、プラズマディスプレイテレビなどの平面型ディスプレイテレビにおいて、埃堆積により、空冷ファンが、回転できなくなるのを防止する平面型ディスプレイテレビ用放熱機構に関する。 The present invention relates to a heat dissipating mechanism for a flat display television that prevents an air cooling fan from rotating due to dust accumulation in a flat display television such as a plasma display television.
　従来のプラズマディスプレイテレビの放熱機構は、軸流ファンを使っており、エアーフィルターを設けた吸気口から埃の少ない空気をテレビ筐体内に取り入れ、発熱源である電気回路基板とプラズマディスプレイパネルとシャーシを冷却している（例えば、特許文献１参照）。 The heat dissipation mechanism of the conventional plasma display TV uses an axial fan, and air with less dust is taken into the TV casing from the air inlet provided with an air filter, and the electric circuit board, plasma display panel, and chassis that are heat sources (See, for example, Patent Document 1).
　図１６は、特許文献１に記載された従来のプラズマディスプレイテレビの放熱機構を示すものである。従来のプラズマディスプレイテレビは、プラズマディスプレイパネル１１０５と、シャーシ１１０１と、保護ガラス１１１３と、電気回路基板１１０７と、軸流ファンユニット１１０２と、フロントカバー１１０９と、バックカバー１１０８とから構成されている。 FIG. 16 shows a heat dissipation mechanism of a conventional plasma display television described in Patent Document 1. A conventional plasma display television includes a plasma display panel 1105, a chassis 1101, a protective glass 1113, an electric circuit board 1107, an axial fan unit 1102, a front cover 1109, and a back cover 1108.
　シャーシ１１０１は、アルミなどの金属板であり、接着剤が付いた熱伝導シートを介してプラズマディスプレイパネル１１０５を保持している。また、シャーシ１１０１は、プラズマディスプレイパネル１１０５の取り付け面と反対側の面に複数の電気回路基板１１０７も保持している。シャーシ１１０１とプラズマディスプレイパネル１１０５と電気回路基板１１０７をひとかたまりとしたものが、フロントカバー１１０９と組み合わされている。さらに、フロントカバー１１０９は、バックカバー１１０８と合わさり、プラズマディスプレイテレビの筐体を構成している。 The chassis 1101 is a metal plate such as aluminum and holds the plasma display panel 1105 via a heat conductive sheet with an adhesive. The chassis 1101 also holds a plurality of electric circuit boards 1107 on the surface opposite to the mounting surface of the plasma display panel 1105. A group of a chassis 1101, a plasma display panel 1105, and an electric circuit board 1107 is combined with a front cover 1109. Further, the front cover 1109 is combined with the back cover 1108 to constitute a casing of the plasma display television.
　バックカバー１１０８は、吸気口１１１８とエアーフィルター１１１１と排気口１１１０とビス締めボス１１４７とから構成されている。 The back cover 1108 includes an intake port 1118, an air filter 1111, an exhaust port 1110, and a screw fastening boss 1147.
　軸流ファンユニット１１０２は、ファンケーシング１１７０と、ファンケーシング１１７１と、ファンモータと、ファン羽根とから構成されている。図１６に示す軸流ファンユニット１１０２は吸い込み型ファンである。軸流ファンユニット１１０２は、バックカバー１１０８に設けられたビス締めボス１１４７に、ビス１１１９で取り付けられる。矢印１１５５で示すように、低温空気は、エアーフィルター１１１１経由で吸気口１１１８から埃を除去して、プラズマディスプレイテレビの筐体内に取り込まれる。プラズマディスプレイテレビの筐体内に入った空気は、電気回路基板１１０７とプラズマディスプレイパネル１１０５に加熱されたシャーシ１１０１とを空冷する。そして、矢印１１５６で示すように、空気は、排気口１１１０から排出される。 The axial fan unit 1102 includes a fan casing 1170, a fan casing 1171, a fan motor, and fan blades. An axial fan unit 1102 shown in FIG. 16 is a suction type fan. The axial fan unit 1102 is attached to a screw fastening boss 1147 provided on the back cover 1108 with a screw 1119. As indicated by an arrow 1155, the low temperature air is removed from the air inlet 1118 via the air filter 1111 and is taken into the housing of the plasma display television. The air that has entered the casing of the plasma display television cools the electric circuit board 1107 and the chassis 1101 heated by the plasma display panel 1105. Then, as indicated by an arrow 1156, the air is exhausted from the exhaust port 1110.
　図１７は、図１６に示した従来技術の軸流ファンユニット１１０２を、吐き出し型として使用したプラズマディスプレイテレビの放熱機構を表した図である。特定の発熱源を局所的に空冷する場合は、軸流ファンユニット１１０２を吸い込み型として使う方が有効である。しかし、プラズマディスプレイテレビの筐体全体の放熱を行うには、軸流ファンユニット１１０２を吐き出し型ファンとして使う方が有効である。 FIG. 17 is a view showing a heat dissipation mechanism of a plasma display television using the prior art axial fan unit 1102 shown in FIG. 16 as a discharge type. In the case of locally cooling a specific heat source, it is more effective to use the axial fan unit 1102 as a suction type. However, it is more effective to use the axial fan unit 1102 as a discharge fan in order to dissipate heat of the entire casing of the plasma display television.
　図１７に示したプラズマディスプレイテレビは、図１６と同構成要素であり、プラズマディスプレイパネル１１０５と、シャーシ１１０１と、電気回路基板１１０７と、軸流ファンユニット１１０２と、フロントカバー１１０９と、バックカバー１１０８とから構成されている。軸流ファンユニット１１０２がシャーシ１１０１に固定される点と、吐き出し型ファンとして使用される点とが、図１６と異なる。 The plasma display television shown in FIG. 17 has the same components as those in FIG. 16, and includes a plasma display panel 1105, a chassis 1101, an electric circuit board 1107, an axial fan unit 1102, a front cover 1109, and a back cover 1108. It consists of and. FIG. 16 is different from FIG. 16 in that the axial fan unit 1102 is fixed to the chassis 1101 and used as a discharge fan.
　図１８は、遠心ファンユニットを用いたプラズマディスプレイテレビの断面図である。遠心ファンユニット１１０３を用いたプラズマディスプレイテレビは、プラズマディスプレイパネル１１０５と、シャーシ１１０１と、保護ガラス１１１３と、電気回路基板１１０７と、遠心ファンユニット１１０３と、フロントカバー１１０９と、送風ダクト１１３１と、バックカバー１１０８とから構成されている。図１８に示すプラズマディスプレイテレビの放熱機構の構成では、図１６の軸流ファンユニット１１０２のプラズマディスプレイテレビと比較して送風ダクト１１３１が追加されている。図１８の放熱機構において、遠心ファンユニット１１０３は、吐き出し型ファンとして使用されている。遠心ファンユニット１１０３の吸気口は、ファンケーシング１１７０とファンケーシング１１７１の両面に有る（例えば、特許文献２参照）。 FIG. 18 is a cross-sectional view of a plasma display television using a centrifugal fan unit. A plasma display television using the centrifugal fan unit 1103 includes a plasma display panel 1105, a chassis 1101, a protective glass 1113, an electric circuit board 1107, a centrifugal fan unit 1103, a front cover 1109, an air duct 1131, a back And a cover 1108. In the structure of the heat dissipating mechanism of the plasma display television shown in FIG. 18, an air duct 1131 is added as compared with the plasma display television of the axial fan unit 1102 in FIG. 16. In the heat dissipation mechanism of FIG. 18, the centrifugal fan unit 1103 is used as a discharge type fan. The inlets of the centrifugal fan unit 1103 are on both sides of the fan casing 1170 and the fan casing 1171 (see, for example, Patent Document 2).
　図１８に示すプラズマディスプレイテレビの放熱機構の構成において、遠心ファンユニット１１０３は、シャーシ１１０１に備えられたビス締めボス１１４６に、ビス１１１９で取り付けられている。送風ダクト１１３１は、遠心ファンユニット１１０３の吐き出し口に取り付けられている。また、送風ダクト１１３１は、バックカバー１１０８に備えられたビス締めボス１１４５に、ビス１１１９で取り付けられている。そして、送風ダクト１１３１は、遠心ファンユニット１１０３から吐き出された空気を、バックカバー１１０８の排気口１１１０に導く。矢印１１５５で示すように、空気がエアーフィルター１１１１を通して吸気口１１１８からプラズマディスプレイテレビの筐体内に入る。そして、電気回路基板１１０７とシャーシ１１０１を冷却して、温められた空気が矢印１１５６で示すように、排気口１１１０から排出される。 18, the centrifugal fan unit 1103 is attached to a screw fastening boss 1146 provided on the chassis 1101 with a screw 1119. The air duct 1131 is attached to the outlet of the centrifugal fan unit 1103. The air duct 1131 is attached to a screw fastening boss 1145 provided on the back cover 1108 with a screw 1119. The air duct 1131 guides the air discharged from the centrifugal fan unit 1103 to the exhaust port 1110 of the back cover 1108. As indicated by an arrow 1155, air enters the casing of the plasma display television from the air inlet 1118 through the air filter 1111. Then, the electric circuit board 1107 and the chassis 1101 are cooled, and the warmed air is discharged from the exhaust port 1110 as indicated by an arrow 1156.
　図１６、図１７に示した軸流ファンユニット１１０２及び図１８に示した遠心ファンユニット１１０３の埃対策は、エアーフィルター１１１１に加えて、プラズマディスプレイテレビの筐体が厚いことを活用して、ファンケーシング１１７１とバックカバー１１０８との隙間、及びファンケーシング１１７０とシャーシ１１０１との隙間を大きく取る方式を用いている。 The dust countermeasures of the axial fan unit 1102 shown in FIGS. 16 and 17 and the centrifugal fan unit 1103 shown in FIG. 18 take advantage of the thick case of the plasma display TV in addition to the air filter 1111. A system is used in which a gap between the casing 1171 and the back cover 1108 and a gap between the fan casing 1170 and the chassis 1101 are made large.
　しかしながら、今日のようにプラズマディスプレイテレビなどの平面型ディスプレイテレビの更なる薄型化が進むと、空冷ファンユニットの吸気口と対面するバックカバー１１０８あるいはシャーシ１１０１との隙間が狭くなる。図１９Ａは、図１６に示した軸流ファンユニット１１０２の排気口と電気回路基板１１０７との隙間ｄに対する、ファン風量を表している。図１９Ｂは、図１７に示した軸流ファンユニット１１０２の吸気口とシャーシ１１０１との隙間ｈに対する、ファン風量を表している。図１９Ｃは、図１８に示した遠心ファンユニット１１０３のシャーシ側吸気口とシャーシ１１０１との隙間ｓ１と、遠心ファンユニット１１０３のバックカバー側吸気口とバックカバー１１０８との隙間ｓ２との和（ｓ１＋ｓ２）、に対する、ファン風量を表している。ここで、上記したこれらのファンは、共通仕様として、ファン羽根径が８０ｍｍ、ファン厚さが１５ｍｍ、ファン駆動電圧が５Ｖである。 However, as flat display televisions such as plasma display televisions become thinner as today, the gap between the back cover 1108 or the chassis 1101 facing the air inlet of the air cooling fan unit becomes narrower. FIG. 19A shows the fan air volume with respect to the gap d between the exhaust port of the axial fan unit 1102 and the electric circuit board 1107 shown in FIG. FIG. 19B shows the fan air volume with respect to the gap h between the air inlet of the axial fan unit 1102 and the chassis 1101 shown in FIG. FIG. 19C shows the sum (s1 + s2) of the clearance s1 between the chassis-side intake port of the centrifugal fan unit 1103 and the chassis 1101 and the clearance s2 between the back cover-side intake port of the centrifugal fan unit 1103 and the back cover 1108 shown in FIG. ), The fan air volume. Here, these fans described above have, as common specifications, a fan blade diameter of 80 mm, a fan thickness of 15 mm, and a fan drive voltage of 5V.
　図１９Ａ、図１９Ｂ、図１９Ｃに示すように、空冷ファンユニットとシャーシあるいはバックカバーとの隙間が狭くなると、ファン風量の減少に比例してファン空冷能力の低下が発生することを示している。加えて、平面型ディスプレイテレビの更なる薄型化を図ると、主な発熱体であるプラズマディスプレイパネル１１０５と電気回路基板１１０７の距離が短くなり、テレビ筐体の単位体積あたりの発熱密度が大きくなって、従来の厚みのプラズマディスプレイテレビよりも高温になる。ゆえに、平面型ディスプレイテレビの更なる薄型化には、空冷能力の高い冷却機構が必要になる。 As shown in FIGS. 19A, 19B, and 19C, when the gap between the air cooling fan unit and the chassis or the back cover is narrowed, the fan air cooling capacity is reduced in proportion to the decrease in the fan air volume. In addition, when the flat panel display television is further reduced in thickness, the distance between the plasma display panel 1105 which is a main heating element and the electric circuit board 1107 is shortened, and the heat generation density per unit volume of the television casing is increased. Thus, the temperature is higher than that of a plasma display television having a conventional thickness. Therefore, in order to further reduce the thickness of the flat display television, a cooling mechanism with high air cooling capability is required.
　また、埃が堆積しやすい第１の要因は、空冷ファンユニットとシャーシ１１０１あるいはバックカバー１１０８との隙間が狭くなることである。そして、埃が堆積しやすい第２の要因は、図１９Ａ、図１９Ｂ、図１９Ｃで示したように、空冷ファンユニットとの隙間が狭まるために、ファン風量が減ることである。なぜなら、隙間に堆積した埃を空冷ファンによる空気の流れで吹き飛ばすことが出来なくなるからである。 Also, the first factor that dust tends to accumulate is that the gap between the air cooling fan unit and the chassis 1101 or the back cover 1108 becomes narrow. And the 2nd factor with which dust tends to accumulate is that the space | gap with an air-cooling fan unit narrows, as shown in FIG. 19A, FIG. 19B, and FIG. This is because the dust accumulated in the gap cannot be blown away by the air flow from the air cooling fan.
　また、エアーフィルター１１１１は厚みが１～２ｍｍあり、流路抵抗として無視できなくなり、さらに薄型化の設計の観点でもエアーフィルター１１１１は使えなくなる。埃が堆積しやすい第３の要因は、エアーフィルター１１１１の廃止である。従って、平面型ディスプレイテレビの筐体厚みが薄くなると、連鎖的に埃が堆積しやすい要因が増加する。 In addition, the air filter 1111 has a thickness of 1 to 2 mm and cannot be ignored as a flow resistance. Further, the air filter 1111 cannot be used from the viewpoint of a thinner design. The third factor that dust is likely to accumulate is the abolition of the air filter 1111. Therefore, when the casing of the flat display television is thinned, the factor that dust tends to accumulate increases.
　以上のように、平面型ディスプレイテレビの筐体厚みを薄くするとき、空冷ファンユニットには、ファン厚みを薄くしながらファン空冷能力を向上させ、かつ埃に強いこと、という新たな課題が発生している。 As described above, when reducing the thickness of a flat panel display TV case, the air cooling fan unit has a new problem of improving the fan air cooling capacity while reducing the fan thickness and being resistant to dust. ing.
特開２００７－００３８０４号公報JP 2007-003804 A 特開２００５－３４７６７１号公報JP 2005-347671 A
　本発明は、平面型ディスプレイテレビの金属製のシャーシとバックカバーの間に空冷ファンユニットを備える平面型ディスプレイテレビ用放熱機構であって、空冷ファンユニットは、シャーシ、あるいはバックカバーをモータベース部とし、モータベース部に設置されるファンモータと、ファンモータの回転軸と同心のファン羽根とを備えている。シャーシ、あるいはバックカバーは、空冷ファンユニットを固定するモータベース部とする。 The present invention is a heat dissipating mechanism for a flat panel display TV provided with an air cooling fan unit between a metal chassis of the flat panel display TV and a back cover. The air cooling fan unit uses the chassis or the back cover as a motor base part. A fan motor installed on the motor base, and fan blades concentric with the rotation axis of the fan motor. The chassis or the back cover is a motor base portion for fixing the air cooling fan unit.
　このような構成により、空冷ファンユニットとシャーシとの隙間及び空冷ファンユニットとバックカバーとの隙間を大きく取ることができる。したがって、空冷ファンユニット周辺の隙間が大きくなり、埃が堆積しにくくなる。 This configuration makes it possible to make a large gap between the air cooling fan unit and the chassis and a gap between the air cooling fan unit and the back cover. Therefore, the gap around the air cooling fan unit is increased, and dust is less likely to accumulate.
　また、本発明は、平面型ディスプレイテレビの金属製のシャーシとバックカバーの間に空冷ファンユニットを備える平面型ディスプレイテレビ用放熱機構であって、シャーシは、空冷ファンユニットの吸気口に対面する側に、ファンモータの回転軸と同心の溝を有してもよい。 Further, the present invention is a heat dissipating mechanism for a flat display television provided with an air cooling fan unit between a metal chassis of the flat display television and a back cover, and the chassis faces the air inlet of the air cooling fan unit. Further, a groove concentric with the rotating shaft of the fan motor may be provided.
図１は、本発明の実施の形態１に係る平面型ディスプレイテレビ用放熱機構における軸流ファンユニットを用いたプラズマディスプレイテレビの断面図である。FIG. 1 is a cross-sectional view of a plasma display television using an axial fan unit in a heat dissipation mechanism for a flat display television according to Embodiment 1 of the present invention. 図２は、本発明の実施の形態１における同シャーシに設けた円環形状の溝と軸流ファンユニットの寸法関係を説明する斜視図である。FIG. 2 is a perspective view for explaining a dimensional relationship between an annular groove provided in the chassis and an axial fan unit in the first embodiment of the present invention. 図３は、本発明の実施の形態１における同軸流ファンユニットをシャーシに組み立てる前の展開斜視図である。FIG. 3 is an exploded perspective view of the coaxial flow fan unit according to Embodiment 1 of the present invention before it is assembled to the chassis. 図４は、本発明の実施の形態１における同シャーシに設けた溝の形状について、第二の例を示した展開斜視図である。FIG. 4 is an exploded perspective view showing a second example of the shape of the groove provided in the chassis according to the first embodiment of the present invention. 図５は、本発明の実施の形態１における同シャーシに設けた溝の形状について、第三の例を示した展開斜視図である。FIG. 5 is a developed perspective view showing a third example of the shape of the groove provided in the chassis according to the first embodiment of the present invention. 図６は、本発明の実施の形態２に係る平面型ディスプレイテレビ用放熱機構における遠心ファンユニットを用いたプラズマディスプレイテレビの断面図である。FIG. 6 is a cross-sectional view of a plasma display television using a centrifugal fan unit in the heat dissipation mechanism for a flat display television according to Embodiment 2 of the present invention. 図７は、本発明の実施の形態２に係る平面型ディスプレイテレビ用放熱機構においてシャーシに設けた溝の上に遠心ファンユニットを組み立てる前の展開斜視図である。FIG. 7 is an exploded perspective view before assembling the centrifugal fan unit on the groove provided in the chassis in the flat panel display TV heat dissipating mechanism according to Embodiment 2 of the present invention. 図８は、本発明の実施の形態３に係る平面型ディスプレイテレビ用放熱機構における遠心ファンユニットを用いたプラズマディスプレイテレビの断面図である。FIG. 8 is a cross-sectional view of a plasma display television using a centrifugal fan unit in the heat dissipation mechanism for a flat display television according to Embodiment 3 of the present invention. 図９は、本発明の実施の形態３における同遠心ファンユニットの構成要素を説明するファンユニットの断面図である。FIG. 9 is a cross-sectional view of the fan unit for explaining the components of the centrifugal fan unit according to Embodiment 3 of the present invention. 図１０は、本発明の実施の形態３における同遠心ファンユニットのファンモータを構成要素に分解した斜視図である。FIG. 10 is an exploded perspective view of the fan motor of the centrifugal fan unit according to the third embodiment of the present invention as components. 図１１は、本発明の実施の形態３における同遠心ファンユニットのファン回転部を構成要素に分解した斜視図である。FIG. 11 is a perspective view in which the fan rotating portion of the centrifugal fan unit according to Embodiment 3 of the present invention is disassembled into components. 図１２は、本発明の実施の形態３における同遠心ファンユニットと送風ダクトと外囲ファンケーシングと板状ファンケーシングとをシャーシに組み立てる前の斜視図である。FIG. 12 is a perspective view before assembling the centrifugal fan unit, the air duct, the outer fan casing, and the plate-shaped fan casing in the third embodiment of the present invention into the chassis. 図１３は、本発明の実施の形態３における同遠心ファンユニットを組立てて、バックカバーをシャーシに取り付けるときの斜視図である。FIG. 13 is a perspective view when the centrifugal fan unit according to Embodiment 3 of the present invention is assembled and the back cover is attached to the chassis. 図１４は、本発明の実施の形態４に係る平面型ディスプレイテレビ用放熱機構における遠心ファンユニットを用いたプラズマディスプレイテレビの断面図である。FIG. 14 is a cross-sectional view of a plasma display television using a centrifugal fan unit in a heat dissipation mechanism for a flat display television according to Embodiment 4 of the present invention. 図１５は、本発明の実施の形態４における同遠心ファンユニットの構成要素を説明するプラズマディスプレイテレビの断面図である。FIG. 15 is a cross-sectional view of a plasma display television for explaining the components of the centrifugal fan unit according to Embodiment 4 of the present invention. 図１６は、従来技術における軸流ファンユニットを吸い込み型ファンとして用いたプラズマディスプレイテレビの断面図である。FIG. 16 is a cross-sectional view of a plasma display television using an axial fan unit in the prior art as a suction fan. 図１７は、従来技術における軸流ファンユニットを吐き出し型ファンとして用いたプラズマディスプレイテレビの断面図である。FIG. 17 is a cross-sectional view of a plasma display television using an axial fan unit in the prior art as a discharge fan. 図１８は、従来技術における遠心ファンユニットを用いたプラズマディスプレイテレビの断面図である。FIG. 18 is a cross-sectional view of a plasma display television using a centrifugal fan unit in the prior art. 図１９Ａは、従来技術における軸流ファンユニットの排気口と電気回路基板との隙間に対するファン風量の関係を表す図である。FIG. 19A is a diagram illustrating the relationship of the fan air volume with respect to the gap between the exhaust port of the axial fan unit and the electric circuit board in the prior art. 図１９Ｂは、従来技術における軸流ファンユニットの吸気口とシャーシとの隙間に対するファン風量の関係を表す図である。FIG. 19B is a diagram illustrating the relationship of the fan air volume with respect to the gap between the air inlet and the chassis of the axial fan unit in the prior art. 図１９Ｃは、従来技術における遠心ファンユニッのシャーシ側吸気口とシャーシとの隙間と、遠心ファンユニットのバックカバー側吸気口とバックカバーとの隙間との和に対するファン風量の関係を表す図である。FIG. 19C is a diagram illustrating the relationship of the fan air volume with respect to the sum of the clearance between the chassis-side intake port and the chassis of the centrifugal fan unit and the clearance between the back cover-side intake port and the back cover of the centrifugal fan unit in the prior art. .
　以下本発明を実施するための最良の形態について、図面を参照しながら説明する。 Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
　（実施の形態１）
　本発明の実施の形態１について、図１～図５を用いて説明する。本実施の形態に係る平面型ディスプレイテレビ用放熱機構について、プラズマディスプレイテレビに適用した一例を説明する。 (Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. An example in which the flat panel display TV heat dissipation mechanism according to the present embodiment is applied to a plasma display TV will be described.
　図１は、本発明の実施の形態１に係る平面型ディスプレイテレビ用放熱機構における軸流ファンユニット２を用いたプラズマディスプレイテレビの断面図である。図２は、シャーシ１に設けた円環形状の溝３２と軸流ファンユニット２の寸法関係を説明する斜視図である。図３は、本発明の実施の形態１における軸流ファンユニット２をシャーシ１に組み立てる前の展開斜視図である。図４は、シャーシ１に設けた溝３６の形状について、第二の例を示した展開斜視図である。図５は、シャーシ１に設けた溝３７の形状について、第三の例を示した展開斜視図である。 FIG. 1 is a cross-sectional view of a plasma display television using an axial fan unit 2 in the heat dissipation mechanism for a flat display television according to Embodiment 1 of the present invention. FIG. 2 is a perspective view for explaining the dimensional relationship between the annular groove 32 provided in the chassis 1 and the axial fan unit 2. FIG. 3 is an exploded perspective view of the axial flow fan unit 2 according to the first embodiment of the present invention before the chassis 1 is assembled. FIG. 4 is an exploded perspective view showing a second example of the shape of the groove 36 provided in the chassis 1. FIG. 5 is an exploded perspective view showing a third example of the shape of the groove 37 provided in the chassis 1.
　図１に示すように、本実施の形態に係る平面型ディスプレイテレビ用放熱機構におけるプラズマディスプレイテレビは、保護ガラス１３と、フロントカバー９と、バックカバー８と、シャーシ１と、プラズマディスプレイパネル５と、電気回路基板７と、スポンジクッション８０と、軸流ファンユニット２とから構成されている。 As shown in FIG. 1, the plasma display television in the heat dissipation mechanism for a flat display television according to the present embodiment includes a protective glass 13, a front cover 9, a back cover 8, a chassis 1, and a plasma display panel 5. The electric circuit board 7, the sponge cushion 80, and the axial fan unit 2 are configured.
　フロントカバー９は、アルミなどの金属製である。フロントカバー９は、ビス１９にてアルミ製のシャーシ１と固定され、同時に鉄製のバックカバー８と組み合わされる。保護ガラス１３は、補助金具（図は省略）にてフロントカバー９に取り付けられる。 The front cover 9 is made of metal such as aluminum. The front cover 9 is fixed to the aluminum chassis 1 with screws 19 and is combined with the iron back cover 8 at the same time. The protective glass 13 is attached to the front cover 9 with an auxiliary metal fitting (not shown).
　電気回路基板７は、プラズマディスプレイテレビ内に大小合わせて６～１０枚程度搭載される。その内訳は、画像処理等を行う制御回路、テレビチューナー、電源基板などがある。 The electric circuit board 7 is mounted on the plasma display TV in a size of about 6 to 10 in total. The breakdown includes a control circuit for performing image processing and the like, a television tuner, a power supply board, and the like.
　バックカバー８は、鉄系鋼板でできており、吸気口１８と排気口１０を備えている。 The back cover 8 is made of an iron-based steel plate and includes an intake port 18 and an exhaust port 10.
　図２に示すように、軸流ファンユニット２は、ファンモータ４とファン羽根２９と板状ファンケーシング７０と外囲ファンケーシング７１とから構成されている。板状ファンケーシング７０と外囲ファンケーシング７１には、ファンケーシング孔内半径ｒ１とファンケーシング孔外半径ｒ２の円環形状の吸気口が設けられている。板状ファンケーシング７０は、ビス１９にてシャーシ１上のビス締めボス４５にビス締めされる。 As shown in FIG. 2, the axial fan unit 2 includes a fan motor 4, fan blades 29, a plate-shaped fan casing 70, and an outer fan casing 71. The plate-like fan casing 70 and the surrounding fan casing 71 are provided with an annular intake port having a fan casing hole inner radius r1 and a fan casing hole outer radius r2. The plate-shaped fan casing 70 is screwed to the screw-fastening boss 45 on the chassis 1 with screws 19.
　ビス締めボス４５は、アルミ製であり、カシメ工法で製作される。すなわち、ビス締めボス４５は、先端にローレット加工した段つきボスを、シャーシ１に予め設けた予備孔に向かってかしめることで、製作される（図は省略）。 The screw fastening boss 45 is made of aluminum and is manufactured by a caulking method. That is, the screw-fastening boss 45 is manufactured by caulking a stepped boss, which is knurled at the tip, toward a preliminary hole provided in advance in the chassis 1 (not shown).
　引き続き図２を用いて、シャーシ１に設けられた溝３２について説明する。溝３２は、シャーシ１の円環形状の凹部であって、バックカバー８と対面する側に設けている。溝３２は、シャーシ溝内半径がｒ３、シャーシ溝外半径がｒ４である。溝３２は、シャーシ１をプレス加工するときに、同時加工にて形成される。シャーシ１の板厚は２ｍｍ、溝３２の深さは０．７ｍｍである。 Next, the groove 32 provided in the chassis 1 will be described with reference to FIG. The groove 32 is an annular recess of the chassis 1 and is provided on the side facing the back cover 8. The groove 32 has a chassis groove inner radius r3 and a chassis groove outer radius r4. The groove 32 is formed by simultaneous processing when the chassis 1 is pressed. The thickness of the chassis 1 is 2 mm, and the depth of the groove 32 is 0.7 mm.
　溝３２の深さが、深ければ、埃の堆積防止には有効である。しかし、溝３２の深さが、深ければ、シャーシ１の機械的強度が低下する。また、シャーシ１は、プラズマディスプレイテレビが描画中は８０℃以上の高温となる。したがって、シャーシ１で生じる熱応力を小さくするために溝３２を深くするのは好ましくない。シャーシ１の面積と溝３２の面積の比率にもよるが、溝３２の深さは、シャーシ１の厚みの１０％以上５０％以下とする。すなわち、溝３２の体積は、溝３２の外径円の面積とシャーシ１の厚みの積の１０％以上５０％以下とする。溝３２の深さは、シャーシ１の厚みの３０％以上５０％以下が、埃の堆積防止とシャーシ１の機械的強度との観点から、さらに望ましい。 If the depth of the groove 32 is deep, it is effective for preventing dust accumulation. However, if the depth of the groove 32 is deep, the mechanical strength of the chassis 1 is lowered. The chassis 1 is at a high temperature of 80 ° C. or higher while the plasma display television is drawing. Therefore, it is not preferable to deepen the groove 32 in order to reduce the thermal stress generated in the chassis 1. Although depending on the ratio of the area of the chassis 1 to the area of the groove 32, the depth of the groove 32 is 10% to 50% of the thickness of the chassis 1. That is, the volume of the groove 32 is 10% or more and 50% or less of the product of the area of the outer diameter circle of the groove 32 and the thickness of the chassis 1. The depth of the groove 32 is more preferably 30% or more and 50% or less of the thickness of the chassis 1 from the viewpoint of dust accumulation prevention and the mechanical strength of the chassis 1.
　溝３２の円環形状の中心は、軸流ファンユニット２がプラズマディスプレイテレビの筐体内に設置された時のファンモータ４の回転軸と同心となるように、配置されている。そのために、軸流ファンユニット２を固定するためのビス締めボス４５がシャーシ１上に配置されている。すなわち、シャーシ１は、空冷ファンユニットとしての軸流ファンユニット２の吸気口に対面する側に、ファンモータ４の回転軸と同心の溝３２を有する。 The center of the annular shape of the groove 32 is arranged so as to be concentric with the rotational axis of the fan motor 4 when the axial fan unit 2 is installed in the casing of the plasma display television. Therefore, a screw fastening boss 45 for fixing the axial fan unit 2 is disposed on the chassis 1. That is, the chassis 1 has a groove 32 concentric with the rotation shaft of the fan motor 4 on the side facing the intake port of the axial fan unit 2 as an air cooling fan unit.
　さて、軸流ファンユニット２と溝３２において、ｒ３＜ｒ１＜ｒ２＜ｒ４となるよう各部材の半径を形成している。したがって、プラズマディスプレイテレビ内のシャーシ１とバックカバー８との隙間を通る空気は、軸流ファンユニット２の内部を通過して、排気口１０から排気できる。ここで、ｒ１は１５ｍｍ、ｒ２は３０ｍｍ、ｒ３は１０ｍｍ、ｒ４は３５ｍｍである。すなわち、溝の外径であるシャーシ溝外半径ｒ４は、空冷ファンユニットの吸気口の外径であるファンケーシング孔外半径ｒ２より大きく設定している。 Now, in the axial fan unit 2 and the groove 32, the radius of each member is formed so that r3 <r1 <r2 <r4. Therefore, the air passing through the gap between the chassis 1 and the back cover 8 in the plasma display television can pass through the inside of the axial fan unit 2 and be exhausted from the exhaust port 10. Here, r1 is 15 mm, r2 is 30 mm, r3 is 10 mm, and r4 is 35 mm. That is, the chassis groove outer radius r4, which is the outer diameter of the groove, is set to be larger than the fan casing hole outer radius r2, which is the outer diameter of the air inlet of the air-cooled fan unit.
　次に、スポンジクッション８０について、図３を用いて説明する。スポンジクッション８０の材質は、ウレタンフォームである。スポンジクッション８０の形状は円環である。スポンジクッション８０の内半径はファンケーシング孔外半径ｒ２に等しく、スポンジクッション８０の外半径は軸流ファンユニット２の外半径より数ｍｍ大きい。スポンジクッション８０の厚みは２～５ｍｍである。スポンジクッション８０は、外囲ファンケーシング７１に両面テープで貼られ、外囲ファンケーシング７１とバックカバー８との隙間を塞ぐ。 Next, the sponge cushion 80 will be described with reference to FIG. The material of the sponge cushion 80 is urethane foam. The shape of the sponge cushion 80 is a ring. The inner radius of the sponge cushion 80 is equal to the outer radius r2 of the fan casing hole, and the outer radius of the sponge cushion 80 is several mm larger than the outer radius of the axial fan unit 2. The sponge cushion 80 has a thickness of 2 to 5 mm. The sponge cushion 80 is affixed to the outer fan casing 71 with double-sided tape, and closes the gap between the outer fan casing 71 and the back cover 8.
　本実施の形態における平面型ディスプレイテレビ用放熱機構を適用したプラズマディスプレイテレビは、従来例に比べて、溝３２の深さだけ板状ファンケーシング７０とシャーシ１との隙間が広くなる。したがって、プラズマディスプレイテレビ内の空気の流れにおける流路抵抗が減る。その結果、空冷ファンユニットの空冷能力が向上する。同時に埃が堆積しにくい構成となる。 In the plasma display television to which the heat dissipation mechanism for a flat display television in the present embodiment is applied, the gap between the plate-shaped fan casing 70 and the chassis 1 is widened by the depth of the groove 32 as compared with the conventional example. Therefore, the channel resistance in the air flow in the plasma display television is reduced. As a result, the air cooling capability of the air cooling fan unit is improved. At the same time, the dust is less likely to accumulate.
　次に、本実施の形態における熱の流れを説明する。図１と図２において軸流ファンユニット２の回転により、矢印５５で示すように、吸気口１８から吸い込まれた冷たい空気は、発熱している電気回路基板７と、プラズマディスプレイパネルによって加熱されたシャーシ１とを冷却する。この冷却作用によって加熱された空気は上昇を続け、軸流ファンユニット２の直前で溝３２と板状ファンケーシング７０との隙間に進む。そして、空気は溝３２を経て、板状ファンケーシング７０に設けたファンケーシング孔内半径ｒ１とファンケーシング孔外半径ｒ２の吸気口から軸流ファンユニット２の中に入っていく。それから、軸流ファンユニット２の中の空気は、矢印５６で示すように、排気口１０から吐き出される。 Next, the heat flow in this embodiment will be described. 1 and 2, the cold air sucked from the air inlet 18 is heated by the heat generating electric circuit board 7 and the plasma display panel as indicated by the arrow 55 by the rotation of the axial fan unit 2. The chassis 1 is cooled. The air heated by this cooling action continues to rise and advances to the gap between the groove 32 and the plate-shaped fan casing 70 immediately before the axial fan unit 2. Then, the air passes through the groove 32 and enters the axial fan unit 2 from the inlet of the fan casing hole inner radius r1 and the fan casing hole outer radius r2 provided in the plate fan casing 70. Then, the air in the axial fan unit 2 is discharged from the exhaust port 10 as indicated by an arrow 56.
　上記したように、本実施の形態における平面型ディスプレイテレビ用放熱機構を適用したプラズマディスプレイテレビは、シャーシ１に溝３２を設けて、軸流ファンユニット２とシャーシ１との隙間を増やしている。その結果、軸流ファンユニット２への埃堆積が防止でき、薄型筐体プラズマディスプレイテレビを起動するときにファンモータ４が回転しない課題を解決できる。 As described above, in the plasma display television to which the flat display television heat dissipation mechanism in the present embodiment is applied, the groove 32 is provided in the chassis 1 to increase the gap between the axial fan unit 2 and the chassis 1. As a result, dust accumulation on the axial fan unit 2 can be prevented, and the problem that the fan motor 4 does not rotate when starting the thin casing plasma display television can be solved.
　なお、本実施の形態において、溝３２を円環形状としたが、溝を円形状としても良い。図４は、シャーシ１に形成された溝形状の第二の例を示している。溝３６は、軸流ファンユニット２の回転中心を同心とした円形状であり、溝３２と異なりシャーシ溝内半径ｒ３は０である。このとき板状ファンケーシング７０と外囲ファンケーシング７１の吸気口のファンケーシング孔内半径ｒ１、ファンケーシング孔外半径ｒ２と、シャーシ１に設けた溝３６のシャーシ溝外半径ｒ４の関係は、ｒ３（＝０）＜ｒ１＜ｒ２＜ｒ４であり、溝３２と同様である。軸流ファンユニット２のファン羽根２９が小口径のときは、シャーシ溝外半径ｒ４も小さくなる。したがって、ｒ３＝０でもシャーシ１の機械強度は実用上支障ない。 In the present embodiment, the groove 32 has an annular shape, but the groove may have a circular shape. FIG. 4 shows a second example of the groove shape formed in the chassis 1. The groove 36 has a circular shape in which the rotation center of the axial fan unit 2 is concentric. Unlike the groove 32, the chassis groove radius r3 is zero. At this time, the relationship between the fan casing hole inner radius r1 and the fan casing hole outer radius r2 of the air inlet of the plate fan casing 70 and the surrounding fan casing 71 and the chassis groove outer radius r4 of the groove 36 provided in the chassis 1 is r3. (= 0) <r1 <r2 <r4, which is similar to the groove 32. When the fan blade 29 of the axial fan unit 2 has a small diameter, the chassis groove outer radius r4 is also reduced. Therefore, even if r3 = 0, the mechanical strength of the chassis 1 has no practical problem.
　なお、本実施の形態において、溝３２を円環形状としたが、溝を軸流ファンユニット２の回転軸を同心として放射状に広がる複数の扇形状としてもよい。図５は、シャーシ１に形成された溝形状の第三の例を示している。溝３７は、軸流ファンユニット２の回転軸を同心とした扇形状の凹部であり、シャーシ１上の周方向に複数個配置している。溝３７のシャーシ溝内半径ｒ３、シャーシ溝外半径ｒ４は、軸流ファンユニット２の板状ファンケーシング７０と外囲ファンケーシング７１の吸気口のファンケーシング孔内半径ｒ１、ファンケーシング孔外半径ｒ２に対して、ｒ３＜ｒ１＜ｒ２＜ｒ４の関係を持つ。複数の扇形状の溝３７の間にシャーシ１の厚みが２ｍｍの溝でない部分が扇形状の溝３７の面積以上あるため、すなわち、扇形状の溝３７が５０％以下の面積であるため、シャーシ１の機械強度は実用上支障ない。したがって、溝３７は凹部でなく、貫通孔にしてもよい。 In the present embodiment, the groove 32 has an annular shape. However, the groove may have a plurality of fan shapes that radially extend with the rotation axis of the axial fan unit 2 being concentric. FIG. 5 shows a third example of the groove shape formed in the chassis 1. The groove 37 is a fan-shaped recess having the rotation axis of the axial fan unit 2 concentric, and a plurality of grooves 37 are arranged in the circumferential direction on the chassis 1. The chassis groove inner radius r3 and the chassis groove outer radius r4 of the groove 37 are the fan casing hole inner radius r1 and the fan casing hole outer radius r2 of the air inlets of the plate fan casing 70 and the surrounding fan casing 71 of the axial fan unit 2, respectively. In contrast, r3 <r1 <r2 <r4. The portion of the chassis 1 that is not 2 mm thick between the plurality of fan-shaped grooves 37 is larger than the area of the fan-shaped grooves 37, that is, the fan-shaped grooves 37 have an area of 50% or less. The mechanical strength of 1 has no practical problem. Therefore, the groove 37 may be a through hole instead of a recess.
　なお、本実施の形態における平面型ディスプレイテレビ用放熱機構について、プラズマディスプレイテレビに適用した一例を説明した。しかし、液晶ディスプレイテレビやフィールドエミッションテレビなどの平面型ディスプレイテレビにも、本発明を適用できる。その場合は、筐体内のディスプレイパネルを保持するシャーシに軸流ファンユニット２を配置する。 In addition, the example which applied the plasma display television about the thermal radiation mechanism for flat type display televisions in this Embodiment was demonstrated. However, the present invention can also be applied to flat display televisions such as liquid crystal display televisions and field emission televisions. In that case, the axial fan unit 2 is arranged in a chassis that holds the display panel in the housing.
　（実施の形態２）
　本発明の実施の形態２について、図６～図７を用いて説明する。本実施の形態に係る平面型ディスプレイテレビ用放熱機構についても、プラズマディスプレイテレビに適用した一例を説明する。実施の形態１と同じ構成要素については、同じ符号を用い、説明を省略することが有る。 (Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. An example in which the flat panel display TV heat dissipation mechanism according to this embodiment is applied to a plasma display TV will also be described. About the same component as Embodiment 1, the same code | symbol is used and description may be abbreviate | omitted.
　図６は、本発明の実施の形態２に係る平面型ディスプレイテレビ用放熱機構における遠心ファンユニット３を用いたプラズマディスプレイテレビの断面図である。図７は、本発明の実施の形態２に係る平面型ディスプレイテレビ用放熱機構における遠心ファンユニット３をシャーシ１に組み立てる前の展開斜視図である。 FIG. 6 is a cross-sectional view of a plasma display television using the centrifugal fan unit 3 in the heat dissipation mechanism for a flat display television according to Embodiment 2 of the present invention. FIG. 7 is a developed perspective view of the centrifugal fan unit 3 in the heat dissipating mechanism for a flat display television according to the second embodiment of the present invention before the chassis 1 is assembled.
　実施の形態１と実施の形態２の違いは、空冷ファンユニットが軸流ファンユニット２でなく、両面吸気仕様の遠心ファンユニット３という点と、送風ダクト３１が追加されている点と、バックカバー８に溝３３を追加した点とである。 The difference between the first embodiment and the second embodiment is that the air-cooling fan unit is not the axial fan unit 2 but the double-sided intake centrifugal fan unit 3, the air duct 31 is added, and the back cover 8 and a groove 33 added thereto.
　本実施の形態に係る平面型ディスプレイテレビ用放熱機構におけるプラズマディスプレイテレビは、保護ガラス１３と、フロントカバー９と、バックカバー８と、シャーシ１と、プラズマディスプレイパネル５と、電気回路基板７と、スポンジクッション８１と、送風ダクト３１と、遠心ファンユニット３とから構成されている。 The plasma display TV in the heat dissipation mechanism for a flat display TV according to the present embodiment includes a protective glass 13, a front cover 9, a back cover 8, a chassis 1, a plasma display panel 5, an electric circuit board 7, The sponge cushion 81, the air duct 31, and the centrifugal fan unit 3 are configured.
　バックカバー８は、鉄系鋼板でできており、吸気口１８と排気口１０と溝３３とを備えている。 The back cover 8 is made of an iron-based steel plate and includes an intake port 18, an exhaust port 10, and a groove 33.
　溝３２は、シャーシ１の円環形状の凹部であって、バックカバー８と対面する側に設けている。溝３２は、シャーシ溝内半径がｒ３、シャーシ溝外半径がｒ４である。溝３２は、シャーシ１をプレス加工するときに同時加工にて形成される。シャーシ１の板厚は２ｍｍ、溝３２の深さは０．７ｍｍである。 The groove 32 is an annular recess of the chassis 1 and is provided on the side facing the back cover 8. The groove 32 has a chassis groove inner radius r3 and a chassis groove outer radius r4. The groove 32 is formed by simultaneous processing when the chassis 1 is pressed. The thickness of the chassis 1 is 2 mm, and the depth of the groove 32 is 0.7 mm.
　溝３３は、バックカバー８の円環形状の凹部であって、シャーシ１と対面する側に設けている。溝３３は、バックカバー溝内半径がｒ５、バックカバー溝外半径がｒ６である。ここで、ｒ３＝ｒ５、ｒ４＝ｒ６とすればよい。また、ｒ５をｒ３未満、ｒ６をｒ４より大きくすれば、空気の流れにおける流路抵抗をさらに小さくできる。すなわち、空冷ファンユニット遠心ファンユニット３は、バックカバー８に対面する側に、さらに吸気口を備えている。そして、バックカバー８は、遠心ファンユニット３の吸気口に対面する側に、ファンモータ４の回転軸と同心の溝３３を有する。溝３３は、バックカバー８をプレス加工するときに同時加工にて形成される。バックカバー８の板厚は２ｍｍ、溝３３の深さは０．７ｍｍである。すなわち、溝の外径であるバックカバー溝外半径ｒ６は、空冷ファンユニットの吸気口の外径であるファンケーシング孔外半径ｒ２より大きく設定している。 The groove 33 is an annular concave portion of the back cover 8 and is provided on the side facing the chassis 1. The groove 33 has a back cover groove inner radius r5 and a back cover groove outer radius r6. Here, r3 = r5 and r4 = r6 may be set. If r5 is less than r3 and r6 is greater than r4, the flow resistance in the air flow can be further reduced. That is, the air cooling fan unit centrifugal fan unit 3 further includes an air inlet on the side facing the back cover 8. The back cover 8 has a groove 33 concentric with the rotating shaft of the fan motor 4 on the side facing the air inlet of the centrifugal fan unit 3. The groove 33 is formed by simultaneous processing when the back cover 8 is pressed. The plate thickness of the back cover 8 is 2 mm, and the depth of the groove 33 is 0.7 mm. That is, the back cover groove outer radius r6, which is the outer diameter of the groove, is set to be larger than the fan casing hole outer radius r2, which is the outer diameter of the air inlet of the air cooling fan unit.
　送風ダクト３１は、ポリカーボネートなどのプラスチック材料で成型されている。送風ダクト３１は、ビス１９によりバックカバー８上のビス締めボス４６に固定される。送風ダクト３１は、遠心ファンユニット３の吐き出し口４９から出た空気を、バックカバー８の排気口１０へ誘導する。 The air duct 31 is molded from a plastic material such as polycarbonate. The air duct 31 is fixed to a screw fastening boss 46 on the back cover 8 by a screw 19. The air duct 31 guides the air that has exited from the discharge port 49 of the centrifugal fan unit 3 to the exhaust port 10 of the back cover 8.
　次に、スポンジクッション８１について、図７を用いて説明する。スポンジクッション８１の材質はウレタンフォームである。スポンジクッション８１の形状は矩形である。スポンジクッション８１の寸法は、送風ダクト３１の吐き出し口３９に対応し、両面テープで送風ダクト３１に貼られる。 Next, the sponge cushion 81 will be described with reference to FIG. The material of the sponge cushion 81 is urethane foam. The shape of the sponge cushion 81 is rectangular. The dimension of the sponge cushion 81 corresponds to the outlet 39 of the air duct 31 and is affixed to the air duct 31 with a double-sided tape.
　本実施の形態における遠心ファンユニット３では、溝３２と溝３３の深さだけ遠心ファンユニット３の吸気口の空間が広くなる。その結果、実施の形態１に比べて、さらに、プラズマディスプレイテレビ内の空気の流れにおける流路抵抗が減って空冷能力が向上する。その結果、遠心ファンユニット３への埃堆積が防止でき、薄型筐体プラズマディスプレイテレビを起動するときにファンモータ４が回転しない課題を解決できる。 In the centrifugal fan unit 3 in the present embodiment, the space of the inlet of the centrifugal fan unit 3 is widened by the depth of the groove 32 and the groove 33. As a result, compared with Embodiment 1, the flow resistance in the air flow in the plasma display television is further reduced, and the air cooling capability is improved. As a result, dust accumulation on the centrifugal fan unit 3 can be prevented, and the problem that the fan motor 4 does not rotate when starting the thin casing plasma display television can be solved.
　次に、本実施の形態における熱の流れを説明する。図６に示すように、遠心ファンユニット３のファンモータ４の回転により、矢印５５で示すように吸気口１８から吸い込まれた冷たい空気は、発熱している電気回路基板７とプラズマディスプレイパネル５によって加熱されたシャーシ１とを冷却する。この冷却作用によって加熱された空気は、上昇を続け遠心ファンユニット３の直前で溝３２と板状ファンケーシング７０の隙間、および外囲ファンケーシング７１と溝３３との隙間に分かれて上昇する。 Next, the heat flow in this embodiment will be described. As shown in FIG. 6, by the rotation of the fan motor 4 of the centrifugal fan unit 3, the cold air sucked from the air inlet 18 as shown by the arrow 55 is generated by the electric circuit board 7 and the plasma display panel 5 that generate heat. The heated chassis 1 is cooled. The air heated by this cooling action continues to rise and rises in the gap between the groove 32 and the plate-shaped fan casing 70 and the gap between the outer fan casing 71 and the groove 33 immediately before the centrifugal fan unit 3.
　二つに分かれた空気は、それぞれに板状ファンケーシング７０のファンケーシング孔内半径ｒ１からファンケーシング孔内半径ｒ２である吸気口と、外囲ファンケーシング７１のファンケーシング孔内半径ｒ１からファンケーシング孔内半径ｒ２である吸気口とから遠心ファンユニット３に入る。そして、遠心ファンユニット３に入った空気は、吐き出し口４９から遠心ファンユニット３を抜け、送風ダクト３１へと進む。そして、最終的に空気は、送風ダクト３１の吐き出し口３９と連結したバックカバー８の排気口１０から、矢印５６で示すように排気される。 The air that has been divided into two parts is the air inlet from the fan casing hole inner radius r1 to the fan casing hole inner radius r2 of the plate fan casing 70 and the fan casing hole inner radius r1 of the outer fan casing 71, respectively. The centrifugal fan unit 3 is entered from the air inlet having the inner radius r2. Then, the air that has entered the centrifugal fan unit 3 passes through the centrifugal fan unit 3 from the discharge port 49 and proceeds to the blower duct 31. Finally, the air is exhausted from the exhaust port 10 of the back cover 8 connected to the discharge port 39 of the blower duct 31 as indicated by an arrow 56.
　上記したように、本実施の形態に係る平面型ディスプレイテレビ用放熱機構におけるプラズマディスプレイテレビのシャーシ１とバックカバー８とに、それぞれ溝３２、溝３３を設けて遠心ファンユニット３との隙間を増やすことにより、遠心ファンユニット３への埃堆積が防止でき、平面型ディスプレイテレビとしてのプラズマディスプレイテレビを起動するときにファンモータ４が回転しない課題を解決できる。 As described above, the plasma display television chassis 1 and the back cover 8 in the flat panel display television heat dissipating mechanism according to the present embodiment are provided with the grooves 32 and 33, respectively, to increase the clearance with the centrifugal fan unit 3. Thus, dust accumulation on the centrifugal fan unit 3 can be prevented, and the problem that the fan motor 4 does not rotate when the plasma display television as the flat display television is started can be solved.
　（実施の形態３）
　本発明の実施の形態３について、図８～図１３を用いて説明する。本実施の形態に係る平面型ディスプレイテレビ用放熱機構についても、プラズマディスプレイテレビに適用した一例を説明する。 (Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. An example in which the flat panel display TV heat dissipation mechanism according to this embodiment is applied to a plasma display TV will also be described.
　図８は、本発明の実施の形態３に係る平面型ディスプレイテレビ用放熱機構における遠心ファンユニット１０３を用いたプラズマディスプレイテレビの断面図である。図９は、本発明の実施の形態３における遠心ファンユニット１０３の構成要素を説明する断面図である。図１０は、本発明の実施の形態３における遠心ファンユニット１０３のファンモータ１０４を構成要素に分解した斜視図である。図１１は、本発明の実施の形態３における遠心ファンユニット１０３のファン回転部１１２を構成要素に分解した斜視図である。図１２は、本発明の実施の形態３における遠心ファンユニット１０３と送風ダクト１３１と外囲ファンケーシング１３０と板状ファンケーシング１３４とをシャーシ１０１に組み立てる前の斜視図である。図１３は、本発明の実施の形態３における遠心ファンユニット１０３を組立てて、バックカバー１０８をシャーシ１０１に取り付けるときの斜視図である。 FIG. 8 is a cross-sectional view of a plasma display television using the centrifugal fan unit 103 in the heat dissipation mechanism for a flat display television according to Embodiment 3 of the present invention. FIG. 9 is a cross-sectional view illustrating components of centrifugal fan unit 103 according to Embodiment 3 of the present invention. FIG. 10 is an exploded perspective view of the fan motor 104 of the centrifugal fan unit 103 according to the third embodiment of the present invention as components. FIG. 11 is an exploded perspective view of the fan rotating unit 112 of the centrifugal fan unit 103 according to the third embodiment of the present invention. FIG. 12 is a perspective view before the centrifugal fan unit 103, the air duct 131, the outer fan casing 130, and the plate-shaped fan casing 134 according to the third embodiment of the present invention are assembled to the chassis 101. FIG. 13 is a perspective view when the centrifugal fan unit 103 according to the third embodiment of the present invention is assembled and the back cover 108 is attached to the chassis 101.
　まず、本実施の形態に係る平面型ディスプレイテレビ用放熱機構におけるプラズマディスプレイテレビの構成について説明する。図８に示すように、プラズマディスプレイテレビは、保護ガラス１１３と、フロントカバー１０９と、バックカバー１０８と、シャーシ１０１と、フロントパネル１０６と、バックパネル１０５と、電気回路基板１０７と、外囲ファンケーシング１３０と、送風ダクト１３１と、スペーサー１４４と、遠心ファンユニット１０３とから構成されている。 First, the configuration of the plasma display TV in the flat panel display TV heat dissipation mechanism according to the present embodiment will be described. As shown in FIG. 8, the plasma display television includes a protective glass 113, a front cover 109, a back cover 108, a chassis 101, a front panel 106, a back panel 105, an electric circuit board 107, and an external fan. The casing 130, the air duct 131, the spacer 144, and the centrifugal fan unit 103 are configured.
　シャーシ１０１は、アルミなどの金属製で、板厚は２ｍｍである。シャーシ１０１には、プラズマディスプレイパネルのバックパネル１０５とフロントパネル１０６の２枚が接着剤の付いた熱伝導シート（図は省略）で取り付けられている。溝１３２は、シャーシ１の円環状の凹部であって、バックカバー１０８に対面する側の面に彫られている。溝１３２の深さは０．７ｍｍである。溝１３２の深さは、シャーシ１０１の板厚の半分以下であり、強度的に問題ない。溝１３２は、シャーシ１０１の成型時に、凹型にプレス加工される。図１２に示すように、溝１３２の円環の中心軸と、遠心ファンユニット１０３の回転中心とは同心になるようにシャーシ１０１上に配置されている。また、シャーシ１０１は、発熱しているフロントパネル１０６およびバックパネル１０５と、電気回路基板１０７とに挟まれて高温状態に加熱されている。 The chassis 101 is made of metal such as aluminum and has a thickness of 2 mm. Two pieces of a back panel 105 and a front panel 106 of the plasma display panel are attached to the chassis 101 by a heat conductive sheet (not shown) with an adhesive. The groove 132 is an annular recess of the chassis 1 and is carved on the surface facing the back cover 108. The depth of the groove 132 is 0.7 mm. The depth of the groove 132 is less than half the plate thickness of the chassis 101, and there is no problem in strength. The groove 132 is pressed into a concave shape when the chassis 101 is molded. As shown in FIG. 12, the central axis of the annular ring of the groove 132 and the rotation center of the centrifugal fan unit 103 are arranged on the chassis 101 so as to be concentric. The chassis 101 is sandwiched between the front panel 106 and the back panel 105 that generate heat and the electric circuit board 107 and is heated to a high temperature state.
　図９に示すように、シャーシ１０１は、ファンモータ１０４を固定するためにビス締めボス１４１を備えている。ビス締めボス１４１は、シャーシ１０１に予め設けた予備孔に向かって、先端にローレット加工した段つきボスを、カシメ工法で固定して形成する（図は省略）。他にもシャーシ１０１には、カシメ工法で、送風ダクト１３１の固定用のビス締めボス１４０と板状ファンケーシング１３４の固定用のビス締めボス１４２が備えられている。上記した３種類のビス締めボス１４０、１４１、１４２の材質はアルミであり、ビス締め作業用に予備孔が彫られている。図９ではビス締めボス１４０、１４１、１４２をシャーシ１０１と一体成型としているが、平らなシャーシ１０１の上の追加部品としてもよい。 As shown in FIG. 9, the chassis 101 includes a screw fastening boss 141 for fixing the fan motor 104. The screw-fastening boss 141 is formed by fixing a stepped boss, which is knurled at the tip, to a preliminary hole provided in the chassis 101 by a caulking method (not shown). In addition, the chassis 101 is provided with a screw fastening boss 140 for fixing the air duct 131 and a screw fastening boss 142 for fixing the plate-shaped fan casing 134 by a caulking method. The material of the above-described three types of screw fastening bosses 140, 141, 142 is aluminum, and a preliminary hole is carved for a screw fastening operation. In FIG. 9, the screw fastening bosses 140, 141, and 142 are integrally formed with the chassis 101, but may be additional parts on the flat chassis 101.
　アルミ製のフロントカバー１０９は、ビス１１９にてシャーシ１０１と固定されている。また、フロントカバー１０９には、保護ガラス１１３が補助金具（図は省略）にて取り付けられている。 The aluminum front cover 109 is fixed to the chassis 101 with screws 119. Further, a protective glass 113 is attached to the front cover 109 with auxiliary metal fittings (not shown).
　バックカバー１０８は、鉄などの金属製で、フロントカバー１０９と組み合わされている。また、バックカバー１０８は、吸気口１１８と排気口１１０を備えている。 The back cover 108 is made of metal such as iron and is combined with the front cover 109. Further, the back cover 108 includes an intake port 118 and an exhaust port 110.
　電気回路基板１０７は、プラズマディスプレイテレビ内に大小合わせて６～１０枚程度搭載されている。その内訳は、画像処理等を行う制御回路、チューナ、電源基板などである。 The electric circuit board 107 is mounted on the plasma display television about 6 to 10 in total. The breakdown includes a control circuit for performing image processing and the like, a tuner, a power supply board, and the like.
　スペーサー１４４は、板厚０．５ｍｍのアルミ円環板で、外周部の３箇所にはビス１１９が通る穴が開いている。スペーサー１４４は、プラズマディスプレイテレビ筐体内でのシャーシ１０１と遠心ファンユニット１０３との位置決めに使用している。 The spacer 144 is an aluminum ring plate having a thickness of 0.5 mm, and holes through which screws 119 pass are formed at three locations on the outer periphery. The spacer 144 is used for positioning the chassis 101 and the centrifugal fan unit 103 in the plasma display television case.
　次に、遠心ファンユニット１０３について、図９から図１１を用いて説明する。図９に示すように、遠心ファンユニット１０３は、ファンモータ１０４と、ファン回転部１１２から構成されている。 Next, the centrifugal fan unit 103 will be described with reference to FIGS. As shown in FIG. 9, the centrifugal fan unit 103 includes a fan motor 104 and a fan rotating unit 112.
　まず、図１０を用いて、ファンモータ１０４に関連する構成部材を説明する。ファンモータ１０４は、モータ固定部１２１と、モータ回路基板１２２と、コイル１２３と、鉄心１２４と、ラジアル軸受け部１２７と、スラスト軸受け部１３５と、ラジアル軸受け挿入孔１６５と、鉄心取り付け円筒面１６６と、モータ回路基板受け面１６７とから構成される。遠心ファンユニット１０３の静音性を長期間にわたって保たせるため、ラジアル軸受け部１２７は含油系の流体軸受け方式を採用している。 First, components related to the fan motor 104 will be described with reference to FIG. The fan motor 104 includes a motor fixing part 121, a motor circuit board 122, a coil 123, an iron core 124, a radial bearing part 127, a thrust bearing part 135, a radial bearing insertion hole 165, and an iron core mounting cylindrical surface 166. And a motor circuit board receiving surface 167. In order to maintain the silence of the centrifugal fan unit 103 for a long period of time, the radial bearing portion 127 employs an oil-impregnated fluid bearing system.
　モータ固定部１２１は、最初に、アルミ丸棒を機械加工で削りだして、直径の異なる複数の円筒面を有するフランジに形成する。ファンモータ１０４を形成する上で、鉄心１２４とラジアル軸受け部１２７の同芯度は重要である。したがって、モータ固定部１２１は、ラジアル軸受け挿入孔１６５と鉄心取り付け円筒面１６６とを、アルミ丸棒から同時加工で削り出して作る。モータ固定部１２１の底面には、円形凹部が削り出されている。そして、コイン型磁石のスラスト軸受け部１３５が、上記した円形凹部に接着剤で固定される。 The motor fixing portion 121 is first formed by machining an aluminum round bar into a flange having a plurality of cylindrical surfaces with different diameters. In forming the fan motor 104, the concentricity of the iron core 124 and the radial bearing 127 is important. Therefore, the motor fixing portion 121 is made by simultaneously machining the radial bearing insertion hole 165 and the iron core mounting cylindrical surface 166 from the aluminum round bar. A circular recess is cut out on the bottom surface of the motor fixing portion 121. And the thrust bearing part 135 of a coin-type magnet is fixed to an above-mentioned circular recessed part with an adhesive agent.
　モータ固定部１２１の最も下のフランジには、ビス１１９が通るための穴が、３箇所、開いている。続いて、ラジアル軸受け挿入孔１６５にラジアル軸受け部１２７が挿入され、接着剤で固定される。ラジアル軸受け部１２７は、鋳鉄を焼結した材料なので材料内にたくさんの隙間があり、この隙間には潤滑油が保持されている。モータ回路基板１２２は、モータ回路基板受け面１６７に接着剤にて固定される。鉄心１２４は、例えば、ＳＳ４００で作られている。そして、鉄心１２４はモータ固定部１２１の鉄心取り付け円筒面１６６に挿入され、高さを調整して接着剤で固定される。鉄心１２４には銅線のコイル１２３を巻く。以上でファンモータ１０４が完成する。 The lowermost flange of the motor fixing part 121 has three holes through which screws 119 pass. Subsequently, the radial bearing 127 is inserted into the radial bearing insertion hole 165 and fixed with an adhesive. Since the radial bearing 127 is a material obtained by sintering cast iron, there are many gaps in the material, and lubricating oil is held in these gaps. The motor circuit board 122 is fixed to the motor circuit board receiving surface 167 with an adhesive. The iron core 124 is made of SS400, for example. Then, the iron core 124 is inserted into the iron core mounting cylindrical surface 166 of the motor fixing portion 121, and the height is adjusted and fixed with an adhesive. A copper wire coil 123 is wound around the iron core 124. Thus, the fan motor 104 is completed.
　次に、図１１を用いて、ファン回転部１１２に関連する構成部材を説明する。ファン回転部１１２は、図１１に示すように、ファン羽根１２９と、磁石１２５と、バックヨーク１２６と、回転軸１２８とから構成される。ファン羽根１２９の内側に、磁石１２５と、ＳＳ４００で作ったバックヨーク１２６と、ＳＵＳ４３０系で作った回転軸１２８とを同芯上に整列させて接着剤にて固定する。回転軸１２８の円筒表面には実質的にくの字状の細い動圧溝が転造工法にて彫られている。 Next, components related to the fan rotating unit 112 will be described with reference to FIG. As shown in FIG. 11, the fan rotating unit 112 includes a fan blade 129, a magnet 125, a back yoke 126, and a rotating shaft 128. Inside the fan blade 129, the magnet 125, the back yoke 126 made of SS400, and the rotating shaft 128 made of SUS430 are aligned on the same core and fixed with an adhesive. On the cylindrical surface of the rotating shaft 128, a substantially U-shaped thin dynamic pressure groove is carved by a rolling method.
　こうして構成されたファン回転部１１２の回転軸１２８を、図９で示すように、ラジアル軸受け部１２７の穴に勘合挿入する。ラジアル軸受け部１２７に保持されている潤滑油は、焼結材の隙間からにじみ出し、回転軸１２８の実質的にくの字状の動圧溝に入って、潤滑油膜を作る。モータ回転部１１２が回転すると、潤滑油膜には大きな油圧が発生して、ラジアル軸受け部１２７と回転軸１２８とが非接触に保たれる。 The rotating shaft 128 of the fan rotating portion 112 thus configured is fitted and inserted into the hole of the radial bearing portion 127 as shown in FIG. The lubricating oil held on the radial bearing 127 oozes out from the gap between the sintered materials and enters the substantially dog-shaped dynamic pressure groove of the rotating shaft 128 to form a lubricating oil film. When the motor rotating portion 112 rotates, a large hydraulic pressure is generated in the lubricating oil film, and the radial bearing portion 127 and the rotating shaft 128 are kept in non-contact.
　なお、回転軸１２８は磁性を帯びたＳＵＳ３０４である。また、モータ固定部１２１の底面にあるスラスト軸受け部１３５は磁石である。したがって、スラスト軸受け部１３５の吸引力によって、回転軸１２８を含むファン回転部１１２は、ラジアル軸受け部１２７から抜けることはない。 The rotating shaft 128 is a magnetic SUS304. Further, the thrust bearing portion 135 on the bottom surface of the motor fixing portion 121 is a magnet. Therefore, the fan rotating portion 112 including the rotating shaft 128 does not come out of the radial bearing portion 127 due to the suction force of the thrust bearing portion 135.
　次に、図１２を用いて、送風ダクト１３１を説明する。送風ダクト１３１は、ポリカーボネートなどのプラスチック材料で成型されている。また送風ダクト１３１は、吸い込み口１３８と、吐き出し口１３９と、板状ファンケーシング１３４とから構成されている。送風ダクト１３１は、シャーシ１０１上に設けられた送風ダクト固定用のビス締めボス１４０にビス１１９により固定されている。なお吸い込み口１３８の穴の中心軸は、ファン回転部１１２がシャーシ１０１に取り付けられたときの回転軸１２８と同心となるようビス締めボス１４０を配置している。すなわち、ファンモータ１０４の回転軸１２８とファン羽根１２９とは、同心である。板状ファンケーシング１３４の中央に設けた吸い込み口１３８の形状は外半径がｒ８で内半径ｒ７であり、ファン羽根１２９の半径は吸い込み口１３８の内半径ｒ７より大きく、吸い込み口１３８の外半径ｒ８より小さい。 Next, the air duct 131 will be described with reference to FIG. The air duct 131 is formed of a plastic material such as polycarbonate. The air duct 131 includes a suction port 138, a discharge port 139, and a plate-shaped fan casing 134. The air duct 131 is fixed to a screw fastening boss 140 for fixing the air duct provided on the chassis 101 with screws 119. A screw tightening boss 140 is disposed so that the central axis of the hole of the suction port 138 is concentric with the rotation shaft 128 when the fan rotation unit 112 is attached to the chassis 101. That is, the rotating shaft 128 of the fan motor 104 and the fan blade 129 are concentric. The shape of the suction port 138 provided in the center of the plate-shaped fan casing 134 has an outer radius r8 and an inner radius r7. The radius of the fan blade 129 is larger than the inner radius r7 of the suction port 138, and the outer radius r8 of the suction port 138. Smaller than.
　引き続き図１２を用いて、外囲ファンケーシング１３０を説明する。まず、シャーシ１０１のビス締めボス１４１の上に、スペーサー１４４のビス貫通用穴が一致するように置く。さらに、ファンモータ１０４のビス貫通用穴がビス締めボス１４１の上に位置するよう置く。最後に、ビス１１９にて、ファンモータ１０４とスペーサー１４４をシャーシ１０１に固定する。すなわち、空冷ファンユニットとしての遠心ファンユニット１０３は、シャーシ１０１を、ファンモータ１０４を固定するモータベース部としている。そして、ファンモータ１０４は、モータベース部に設置している。 Subsequently, the surrounding fan casing 130 will be described with reference to FIG. First, the screw through hole of the spacer 144 is placed on the screw fastening boss 141 of the chassis 101 so as to match. Further, the screw through hole of the fan motor 104 is placed on the screw fastening boss 141. Finally, the fan motor 104 and the spacer 144 are fixed to the chassis 101 with screws 119. That is, the centrifugal fan unit 103 as an air cooling fan unit uses the chassis 101 as a motor base portion for fixing the fan motor 104. And the fan motor 104 is installed in the motor base part.
　外囲ファンケーシング１３０は、ファンモータ１０４がシャーシ１０１に取り付けられたときの回転軸１２８の位置を中心に円弧形状を持つ実質的にＵの字の曲板である。また、外囲ファンケーシング１３０は、ポリカーボネートなどのプラスチックで成型されている。外囲ファンケーシング１３０の円弧部分は、モータ回転軸１２８をはさんで送風ダクト１３１と反対側に位置している。また外囲ファンケーシング１３０は、ビス１１９によりシャーシ１０１に備えたビス締めボス１４２に固定される(図１２参照)。外囲ファンケーシング１３０の内半径は、シャーシ１０１上で板状ファンケーシング１３４と隙間なく組み合わさるように板状ファンケーシング１３４の外半径ｒ８と同じとしている。 The surrounding fan casing 130 is a substantially U-shaped curved plate having an arc shape around the position of the rotation shaft 128 when the fan motor 104 is attached to the chassis 101. The surrounding fan casing 130 is molded of plastic such as polycarbonate. The arc portion of the outer fan casing 130 is located on the opposite side of the air duct 131 with the motor rotation shaft 128 interposed therebetween. The outer fan casing 130 is fixed to a screw fastening boss 142 provided on the chassis 101 with a screw 119 (see FIG. 12). The inner radius of the outer fan casing 130 is the same as the outer radius r8 of the plate fan casing 134 so as to be combined with the plate fan casing 134 on the chassis 101 without a gap.
　すなわち、空冷ファンユニットとしての遠心ファンユニット１０３は、板状ファンケーシングと外囲ファンケーシング１３０とを備えている。板状ファンケーシング１３４は、シャーシ１０１とファン羽根１２９との間に配置され、モータベース部に固定されている。外囲ファンケーシング１３０は、ファン羽根１２９の外周であってファン羽根１２９の回転軸に対して垂直方向の外周を囲んでいる。そして、板状ファンケーシング１３４は、ファン羽根１２９の回転により空気を吸い込む吸い込み口１３８を有している。 That is, the centrifugal fan unit 103 as an air cooling fan unit includes a plate-shaped fan casing and an outer fan casing 130. The plate-shaped fan casing 134 is disposed between the chassis 101 and the fan blades 129 and is fixed to the motor base portion. The surrounding fan casing 130 surrounds the outer periphery of the fan blade 129 in the direction perpendicular to the rotation axis of the fan blade 129. The plate-shaped fan casing 134 has a suction port 138 that sucks air by rotation of the fan blades 129.
　引き続き図１２を用いて、遠心ファンユニット１０３をシャーシ１０１に組み立てる手順を説明する。まず、シャーシ１０１のビス締めボス１４１の上に、スペーサー１４４のビス貫通用穴が一致するように置く。さらに、ファンモータ１０４のビス貫通用穴がビス締めボス１４１の上に位置するよう置く。最後に、ビス１１９にてファンモータ１０４とスペーサー１４４をシャーシ１０１に固定する。続いて送風ダクト１３１の吸い込み口１３８をファンモータ１０４に通しながら、送風ダクト１３１をシャーシ１０１上のビス締めボス１４１に置く。そして、ビス１１９で送風ダクト１３１をシャーシ１０１に固定する。次に、ファン回転部１１２の回転軸１２８を、ファンモータ１０４のラジアル軸受け部１２７に挿入する。最後に、外囲ファンケーシング１３０は、バックカバー１０８の排気孔１１０につながる送風ダクト１３１と合わさるようシャーシ１０１上のビス締めボス１４２に、ビス１１９で固定される。 The procedure for assembling the centrifugal fan unit 103 to the chassis 101 will be described with reference to FIG. First, the screw through hole of the spacer 144 is placed on the screw fastening boss 141 of the chassis 101 so as to match. Further, the screw through hole of the fan motor 104 is placed on the screw fastening boss 141. Finally, the fan motor 104 and the spacer 144 are fixed to the chassis 101 with screws 119. Subsequently, the air duct 131 is placed on the screw fastening boss 141 on the chassis 101 while the suction port 138 of the air duct 131 is passed through the fan motor 104. Then, the air duct 131 is fixed to the chassis 101 with screws 119. Next, the rotating shaft 128 of the fan rotating portion 112 is inserted into the radial bearing portion 127 of the fan motor 104. Finally, the outer fan casing 130 is fixed to the screw fastening boss 142 on the chassis 101 with screws 119 so as to be combined with the air duct 131 connected to the exhaust hole 110 of the back cover 108.
　図１３は、シャーシ１０１上に組み立てられた遠心ファンユニット１０３を用いたプラズマディスプレイテレビ放熱機構の概略斜視図である。シャーシ１０１の上方には鉄製のバックカバー１０８があり、ビス１１９によりシャーシ１０１へ締結される。バックカバー１０８の排気口１１０は、送風ダクト１３１に設けられた吐き出し口１３９と勘合し、プラズマディスプレイテレビ内で加熱された空気を排気する流路になる。部品公差と組立公差により生じる吐き出し口１３９とバックカバー１０８の排気口１１０との隙間対策として、隙間にスポンジクッション（図示せず）を挟みこみ隙間を塞いでいる。 FIG. 13 is a schematic perspective view of a plasma display television heat dissipating mechanism using the centrifugal fan unit 103 assembled on the chassis 101. Above the chassis 101 is an iron back cover 108, which is fastened to the chassis 101 with screws 119. The exhaust port 110 of the back cover 108 is fitted with a discharge port 139 provided in the air duct 131 and becomes a flow path for exhausting air heated in the plasma display television. As a countermeasure against a gap between the discharge port 139 and the exhaust port 110 of the back cover 108 caused by component tolerance and assembly tolerance, a sponge cushion (not shown) is sandwiched in the gap to close the gap.
　次に、本実施の形態における熱の流れについて、図８、図１２を用いて説明する。図８に示すように、遠心ファンユニット１０３は、プラズマディスプレイテレビの上部、かつ、シャーシ１０１のバックカバー側に複数個設置される。電気回路基板１０７は、遠心ファンユニット１０３の下側に設置する。遠心ファンユニット１０３のファン回転部１１２が回転すると、矢印１５５で示すように冷たい空気がバックカバー１０８の吸気口１１８からプラズマディスプレイテレビの中に入る。そして、冷たい空気は、シャーシ１０１とバックカバー１０８の間を遠心ファンユニット１０３に向かって上昇する。空気が上昇する過程において発熱している電気回路基板１０７とシャーシ１０１とを冷却しながら、遠心ファンユニット１０３に向かって上昇していく。 Next, the heat flow in the present embodiment will be described with reference to FIGS. As shown in FIG. 8, a plurality of centrifugal fan units 103 are installed on the upper part of the plasma display television and on the back cover side of the chassis 101. The electric circuit board 107 is installed below the centrifugal fan unit 103. When the fan rotating unit 112 of the centrifugal fan unit 103 rotates, cold air enters the plasma display television from the air inlet 118 of the back cover 108 as indicated by an arrow 155. The cold air rises between the chassis 101 and the back cover 108 toward the centrifugal fan unit 103. While the electric circuit board 107 and the chassis 101 generating heat are being cooled in the process of rising air, the air rises toward the centrifugal fan unit 103.
　上記したように、シャーシ１０１は、遠心ファンユニット１０３の吸い込み口１３８に対面する側に、ファンモータ１０４の回転軸１２８と同心の溝を有している。したがって、遠心ファンユニット１０３に到達した空気は、外囲ファンケーシング１３０により真っ直ぐ上昇できず、板状ファンケーシング１３４と溝１３２の隙間を上昇し、図１２に示す吸い込み口１３８から遠心ファンユニット１０３の内部に進行する。そして、空気は、ファン回転部１１２の回転により、外囲ファンケーシング１３０の内壁に沿って旋回しながら、最終的に送風ダクト１３１の吐き出し口１３９を通過する。すなわち、ファン羽根１２９は、回転中心から遠心方向に空気を吐き出す遠心ファン方式である。最後に、空気は、図８に示したバックカバー１０８の排気口１１０から、矢印１５６で示すように、プラズマディスプレイテレビの外へ排気される。 As described above, the chassis 101 has a groove concentric with the rotating shaft 128 of the fan motor 104 on the side facing the suction port 138 of the centrifugal fan unit 103. Therefore, the air that has reached the centrifugal fan unit 103 cannot rise straight by the surrounding fan casing 130, rises through the gap between the plate-like fan casing 134 and the groove 132, and enters the centrifugal fan unit 103 from the suction port 138 shown in FIG. Proceed inside. The air finally passes through the outlet 139 of the air duct 131 while turning along the inner wall of the outer fan casing 130 by the rotation of the fan rotating portion 112. That is, the fan blade 129 is a centrifugal fan system that discharges air in the centrifugal direction from the center of rotation. Finally, the air is exhausted out of the plasma display television from the exhaust port 110 of the back cover 108 shown in FIG.
　本実施の形態おいては、プラズマディスプレイテレビのシャーシ１０１とバックカバー１０８を利用して遠心ファンユニット１０３を構成している。その結果、図１８で示す従来の遠心ファンユニット１１０３と比較して、ファンケーシング１１７１の厚みが減るため、ファン回転部１１２と静止している構成部品（シャーシ１０１、バックカバー１０８）との隙間が広くなる。 In this embodiment, the centrifugal fan unit 103 is configured using the chassis 101 and the back cover 108 of the plasma display television. As a result, compared with the conventional centrifugal fan unit 1103 shown in FIG. 18, the thickness of the fan casing 1171 is reduced, so that there is a gap between the fan rotating portion 112 and the stationary components (chassis 101, back cover 108). Become wider.
　また、図１８に示す従来の遠心ファンユニット１１０３の場合、遠心ファンユニット１１０３をシャーシ１１０１に取り付けるためのビス締めボス１１４５の位置は、回転するファン羽根１１７２より外側になる。そのために、モータ固定部１１７３からシャーシ１１０１への取り付け位置までファンケーシング１１７０の板材を伸ばす必要があった。これに対して、本実施の形態では、図９に示すように、ファン回転部１１２の内側において、モータ固定部１２１とシャーシ１０１を取り付けるビス締めボス１４１を配置できる。したがって、図１８の従来の遠心ファンユニット１１０３のファンケーシング１１７０が不要となる。同時に、従来技術の遠心ファンユニット１１０３で設けていたファン羽根１１７２とファンケーシング１１７０との隙間も不要となる。さらに、図９における板状ファンケーシング１３４は、ビス締めボス１４１の取り付け面の高さと同一にする必要がない。また、板状ファンケーシング１３４が、溝１３２に埋まる構成としている。その結果、本実施の形態のファン回転部１１２と静止部である板状ファンケーシング１３４との隙間は、従来技術の回転するファン羽根１１７２と静止部であるファンケーシング１１７０との隙間より、拡げることができる。 In the case of the conventional centrifugal fan unit 1103 shown in FIG. 18, the position of the screw fastening boss 1145 for attaching the centrifugal fan unit 1103 to the chassis 1101 is outside the rotating fan blade 1172. Therefore, it is necessary to extend the plate of the fan casing 1170 from the motor fixing portion 1173 to the mounting position on the chassis 1101. In contrast, in the present embodiment, as shown in FIG. 9, a screw fastening boss 141 for attaching the motor fixing portion 121 and the chassis 101 can be arranged inside the fan rotating portion 112. Therefore, the fan casing 1170 of the conventional centrifugal fan unit 1103 of FIG. 18 is not necessary. At the same time, the gap between the fan blades 1172 and the fan casing 1170 provided in the conventional centrifugal fan unit 1103 is also unnecessary. Furthermore, the plate-shaped fan casing 134 in FIG. 9 does not have to be the same as the height of the mounting surface of the screw fastening boss 141. Further, the plate-shaped fan casing 134 is embedded in the groove 132. As a result, the gap between the fan rotating unit 112 and the plate-shaped fan casing 134 that is the stationary part of the present embodiment is wider than the gap between the rotating fan blades 1172 and the fan casing 1170 that is the stationary part of the prior art. Can do.
　また、本実施の形態ではバックカバー１０８を、図１８の従来の遠心ファンユニット１１０３のファンケーシング１１７１の代替品としている。したがって、図１８で示すファンケーシング１１７１も不要である。その結果、ファン羽根２９と静止部であるバックカバー８との隙間は、従来技術の回転するファン羽根１１７２と静止部であるファンケーシング１１７０との隙間より、広くすることができる。 In this embodiment, the back cover 108 is used as a substitute for the fan casing 1171 of the conventional centrifugal fan unit 1103 shown in FIG. Therefore, the fan casing 1171 shown in FIG. 18 is also unnecessary. As a result, the gap between the fan blades 29 and the back cover 8 that is a stationary part can be made wider than the gap between the rotating fan blades 1172 and the fan casing 1170 that is a stationary part in the prior art.
　図１８の従来の遠心ファンユニット１１０３と比較して本実施の形態の遠心ファンユニット１０３で得られる隙間の概算値は、ファンケーシング１１７１の板厚約１.５ｍｍ、ファン羽根１１７２とファンケーシング１１７１との隙間０．７ｍｍ、シャーシ１０１とファンケーシング１１７０の隙間０．７ｍｍの合計２．９ｍｍ程度となる。プラズマディスプレイテレビの筐体厚みが３０ｍｍに近づく今日においては、２．９ｍｍの新たな隙間は設計上、重要である。また、スペーサー１４４は板状ファンケーシング１３４とファン回転部１１２との隙間を調整するためのもであって、スペーサー１４４の厚みは、上記した合計隙間２．９ｍｍとは関係しない。 Compared with the conventional centrifugal fan unit 1103 of FIG. 18, the approximate value of the clearance obtained by the centrifugal fan unit 103 of this embodiment is about 1.5 mm thick of the fan casing 1171, the fan blades 1172 and the fan casing 1171. The total gap of 0.7 mm and the gap of 0.7 mm between the chassis 101 and the fan casing 1170 is about 2.9 mm. In today's plasma display television case thickness approaching 30 mm, a new gap of 2.9 mm is important in design. The spacer 144 is for adjusting the gap between the plate-shaped fan casing 134 and the fan rotating portion 112, and the thickness of the spacer 144 is not related to the total gap of 2.9 mm.
　これらのことから、図９のように、ファン回転部１１２と板状ファンケーシング１３４との隙間と、ファン回転部１１２とバックカバー１０８との隙間とが拡大する。その結果、プラズマディスプレイテレビのような平面型ディスプレイテレビの更なる薄型化において、ファン回転部１１２の周辺の隙間を拡大することができ、薄型筐体のプラズマディスプレイテレビを起動するときに、遠心ファンユニット１０３に埃が溜まってファン回転部１１２が回転しないという課題を解決できる。 For these reasons, as shown in FIG. 9, the gap between the fan rotating portion 112 and the plate-shaped fan casing 134 and the gap between the fan rotating portion 112 and the back cover 108 are enlarged. As a result, in further thinning of a flat display television such as a plasma display television, the gap around the fan rotating portion 112 can be enlarged, and when starting a plasma display television with a thin casing, a centrifugal fan The problem that dust accumulates in the unit 103 and the fan rotating unit 112 does not rotate can be solved.
　なお、本実施の形態における平面型ディスプレイテレビ用放熱機構について、プラズマディスプレイテレビに適用した一例を説明した。しかし、液晶ディスプレイテレビやフィールドエミッションテレビなどの平面型ディスプレイテレビにも、本発明を適用できる。その場合は、筐体内のディスプレイパネルを保持するシャーシに遠心ファンユニットを配置する。 In addition, the example which applied the plasma display television about the thermal radiation mechanism for flat type display televisions in this Embodiment was demonstrated. However, the present invention can also be applied to flat display televisions such as liquid crystal display televisions and field emission televisions. In that case, the centrifugal fan unit is arranged in the chassis that holds the display panel in the housing.
　（実施の形態４）
　本発明の実施の形態４について、図１４～図１５を用いて説明する。一部、図１０～図１１も用いる。本実施の形態に係る平面型ディスプレイテレビ用放熱機構についても、プラズマディスプレイテレビに適用した一例を説明する。 (Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIGS. In part, FIGS. 10 to 11 are also used. An example in which the flat panel display TV heat dissipation mechanism according to this embodiment is applied to a plasma display TV will also be described.
　図１４は、本発明の実施の形態４における遠心ファンユニット１０３を用いたプラズマディスプレイテレビの断面図である。図１５は本発明の実施の形態４における遠心ファンユニット１０３の構成を示す断面図である。 FIG. 14 is a sectional view of a plasma display television using the centrifugal fan unit 103 according to Embodiment 4 of the present invention. FIG. 15 is a cross-sectional view showing a configuration of centrifugal fan unit 103 according to Embodiment 4 of the present invention.
　実施の形態３と実施の形態４との差異は、遠心ファンユニット１０３がバックカバー１０８に組み付けられることと、電気配線１５０を行う作業孔１１５がバックカバー１０８に追加されたことである。すなわち、空冷ファンユニットとしての遠心ファンユニット１０３は、バックカバー１０８を、ファンモータ１０４を固定するモータベース部としている。その他の構成要素については、実施の形態３と同じ符号を用い、説明を省略することがある。 The difference between the third embodiment and the fourth embodiment is that the centrifugal fan unit 103 is assembled to the back cover 108 and a work hole 115 for performing the electrical wiring 150 is added to the back cover 108. That is, the centrifugal fan unit 103 as an air cooling fan unit uses the back cover 108 as a motor base portion to which the fan motor 104 is fixed. Other constituent elements are denoted by the same reference numerals as those in the third embodiment, and description thereof may be omitted.
　まず、本実施の形態に係る平面型ディスプレイテレビ用放熱機構におけるプラズマディスプレイテレビの構成について説明する。図１４に示すように、プラズマディスプレイテレビは、保護ガラス１１３と、フロントカバー１０９と、バックカバー１０８と、シャーシ１０１と、フロントパネル１０６と、バックパネル１０５と、電気回路基板１０７と、電気配線１５０と、コネクタ凸部１５１と、コネクタ凹部１５２と、外囲ファンケーシング１３０と、送風ダクト１３１と、遠心ファンユニット１０３とから構成されている。 First, the configuration of the plasma display TV in the flat panel display TV heat dissipation mechanism according to the present embodiment will be described. As shown in FIG. 14, the plasma display television includes a protective glass 113, a front cover 109, a back cover 108, a chassis 101, a front panel 106, a back panel 105, an electric circuit board 107, and an electric wiring 150. And the connector convex portion 151, the connector concave portion 152, the surrounding fan casing 130, the blower duct 131, and the centrifugal fan unit 103.
　次に、遠心ファンユニット１０３は、図１５に示すようにファンモータ１０４と、ファン回転部１１２から構成される。ファンモータ１０４は、図１０と同じ構成であり、モータ固定部１２１と、モータ回路基板１２２と、コイル１２３と、鉄心１２４と、ラジアル軸受け部１２７と、スラスト軸受け１３５と、ラジアル軸受け挿入孔１６５と、鉄心取り付け円筒面１６６と、モータ回路基板受け面１６７とから構成される。ラジアル軸受け部１２７とモータ回路基板１２２と鉄心１２４とコイル１２３とスラスト軸受け部１３５は、それぞれに接着剤でモータ固定部１２１に取り付けられる。次に、ファンモータ１０４は、カシメ工法でバックカバー１０８に固定されたビス締めボス１４３に、ビス１１９で取り付けられる。なお、プラズマディスプレイテレビの筐体に遠心ファンユニット１０３が取り付けられた時に、ファン回転部１１２の内側に位置するようにビス締めボス１４３はバックカバー１０８へ固定されている。 Next, the centrifugal fan unit 103 includes a fan motor 104 and a fan rotating unit 112 as shown in FIG. The fan motor 104 has the same configuration as that shown in FIG. 10, and includes a motor fixing part 121, a motor circuit board 122, a coil 123, an iron core 124, a radial bearing part 127, a thrust bearing 135, and a radial bearing insertion hole 165. And an iron core mounting cylindrical surface 166 and a motor circuit board receiving surface 167. The radial bearing 127, the motor circuit board 122, the iron core 124, the coil 123, and the thrust bearing 135 are each attached to the motor fixing part 121 with an adhesive. Next, the fan motor 104 is attached with a screw 119 to a screw fastening boss 143 fixed to the back cover 108 by a caulking method. The screw fastening boss 143 is fixed to the back cover 108 so as to be located inside the fan rotating portion 112 when the centrifugal fan unit 103 is attached to the casing of the plasma display television.
　ファン回転部１１２は、図１１と同じ構成であり、ファン羽根１２９と、磁石１２５と、バックヨーク１２６と、回転軸１２８とから構成される。ファン羽根１２９の内側には、磁石１２５とバックヨーク１２６と回転軸１２８は同心となるように整列され、接着剤でファン羽根１２９へ取り付けられる。 The fan rotating unit 112 has the same configuration as that of FIG. 11 and includes a fan blade 129, a magnet 125, a back yoke 126, and a rotating shaft 128. Inside the fan blade 129, the magnet 125, the back yoke 126, and the rotating shaft 128 are aligned so as to be concentric, and are attached to the fan blade 129 with an adhesive.
　次に、回転軸１２８を含むファン回転部１１２を、ファンモータ１０４に取り付けたラジアル軸受け部１２７に勘合挿入する。回転軸１２８は磁性を帯びたＳＵＳ３０４であり、スラスト軸受け部１３５は磁石である。したがって、スラスト軸受け部１３５の吸引力によって、ファン回転部１１２はファンモータ１０４から抜けることはない。 Next, the fan rotating part 112 including the rotating shaft 128 is fitted and inserted into the radial bearing part 127 attached to the fan motor 104. The rotating shaft 128 is a magnetic SUS304, and the thrust bearing portion 135 is a magnet. Therefore, the fan rotating unit 112 does not come out of the fan motor 104 by the suction force of the thrust bearing unit 135.
　再び、図１４を用いて、電気配線１５０やその他を説明する。電気配線１５０はモータ回路基板１２２と電気回路基板１０７とを結ぶために、電気配線１５０の先端にコネクタ凸部１５１が取り付けられている。コネクタ凸部１５１のペアとしてコネクタ凹部１５２が電気回路基板１０７に設けられている。そして、これらの２つのコネクタが勘合して電気的に結線される。作業孔１１５は、コネクタの勘合作業を行うための直径３ｃｍの孔であり、勘合作業が終わればシール１１４で塞がれる。 Again, the electrical wiring 150 and others will be described with reference to FIG. In order to connect the electric circuit 150 to the motor circuit board 122 and the electric circuit board 107, a connector projection 151 is attached to the tip of the electric wiring 150. A connector recess 152 is provided on the electric circuit board 107 as a pair of connector protrusions 151. And these two connectors are fitted and electrically connected. The work hole 115 is a hole having a diameter of 3 cm for performing the connector fitting operation, and is closed by the seal 114 when the fitting operation is completed.
　次に、送風ダクト１３１は、吸い込み口１３８と、吐き出し口１３９と、板状ファンケーシング１３４とから構成される。送風ダクト１３１は、遠心ファンユニット１０３から吐き出される空気を排気口１１０に誘導する。空気が遠心ファンユニット１０３の回転中心部に吸い込まれるように、吸い込み口１３８の内径はファン回転部１１２の直径より小さくする。部品公差と組立公差により吐き出し口１３９と排気口１１０との隙間が発生する。その隙間を塞ぐため、スポンジクッション（図示せず）が吐き出し口１３９と排気口１１０との間に挟み込まれる。 Next, the air duct 131 includes a suction port 138, a discharge port 139, and a plate-shaped fan casing 134. The air duct 131 guides the air discharged from the centrifugal fan unit 103 to the exhaust port 110. The inner diameter of the suction port 138 is made smaller than the diameter of the fan rotation unit 112 so that air is sucked into the rotation center of the centrifugal fan unit 103. A gap between the discharge port 139 and the exhaust port 110 is generated due to component tolerance and assembly tolerance. In order to close the gap, a sponge cushion (not shown) is sandwiched between the discharge port 139 and the exhaust port 110.
　溝１３２は、バックカバー８の円環形状の凹部であって、シャーシ１０１側の面に彫られている。バックカバー１０８に遠心ファンユニット１０３が設置された時の回転軸１２８の位置に、溝１３２の円環の中心軸を合わせている。なお、溝１３２の円環形状の凹部の深さは、シャーシ１０１の機械的強度に支障ない範疇として０．７ｍｍとした。 The groove 132 is an annular concave portion of the back cover 8 and is carved on the surface on the chassis 101 side. The center axis of the ring of the groove 132 is aligned with the position of the rotation shaft 128 when the centrifugal fan unit 103 is installed on the back cover 108. The depth of the annular recess of the groove 132 was set to 0.7 mm as a category that does not hinder the mechanical strength of the chassis 101.
　外囲ファンケーシング１３０は、実施の形態３と同じく、遠心ファンユニット１０３の回転軸１２８を中心に円弧形状を持つ実質的にＵの字状の曲板である。そして、外囲ファンケーシング１３０の円弧部分は、回転軸１２８をはさんで送風ダクト１３１と反対側に位置している。また、外囲ファンケーシング１３０は、ビス１１９によりビス締めボス１４２に固定される。 The outer fan casing 130 is a substantially U-shaped curved plate having an arc shape around the rotating shaft 128 of the centrifugal fan unit 103 as in the third embodiment. The arc portion of the outer fan casing 130 is located on the opposite side of the air duct 131 with the rotating shaft 128 interposed therebetween. In addition, the outer fan casing 130 is fixed to the screw fastening boss 142 with a screw 119.
　本実施の形態における熱の流れは、実施の形態３と同様なので説明を省略する。 Since the heat flow in this embodiment is the same as that in Embodiment 3, the description thereof is omitted.
　上記したように、本実施の形態おいては、プラズマディスプレイテレビのバックカバー１０８とシャーシ１０１を利用して遠心ファンユニット１０３を構成している。その結果、図１８で示す従来技術の遠心ファンユニット１１０３と比較してファンケーシング１１７０が減るので、プラズマディスプレイテレビの筐体内に新たな隙間が得られる。従来技術においては、モータ固定部１１７３をシャーシ１１０１に取り付けるビス締めボス１１４５の位置は回転するファン羽根１１７２より外側になる。そのため、モータ固定部１１７３からシャーシ１１０１への取り付け位置までファンケーシング１１７０の板材を伸ばす必要があった。これに対して、本実施の形態では、モータ固定部１２１とバックカバー１０８とを取り付けるためのビス締めボス１４３をファン回転部１１２の内側に配置できる。したがって、図１８で示したファンケーシング１１７０が不要である。その結果、ファン回転部１１２と板状ファンケーシング１３４との隙間、ファン回転部１１２とバックカバー１０８との隙間が広くなる。これらの隙間の概算値は、本実施の形態３と同じ２．９ｍｍなので説明は省略する。このようにして、ファン回転部１１２周辺の隙間が拡大することにより、プラズマディスプレイテレビを起動するときに遠心ファンユニット１０３に埃が溜まらないので、ファン回転部１１２が回転しないという課題を解決できる。 As described above, in this embodiment, the centrifugal fan unit 103 is configured using the back cover 108 and the chassis 101 of the plasma display television. As a result, the fan casing 1170 is reduced as compared with the prior art centrifugal fan unit 1103 shown in FIG. 18, so that a new gap is obtained in the casing of the plasma display television. In the prior art, the position of the screw fastening boss 1145 for attaching the motor fixing portion 1173 to the chassis 1101 is outside the rotating fan blade 1172. Therefore, it is necessary to extend the plate of the fan casing 1170 from the motor fixing portion 1173 to the mounting position on the chassis 1101. On the other hand, in the present embodiment, the screw fastening boss 143 for attaching the motor fixing part 121 and the back cover 108 can be arranged inside the fan rotating part 112. Therefore, the fan casing 1170 shown in FIG. 18 is not necessary. As a result, the gap between the fan rotating portion 112 and the plate-shaped fan casing 134 and the gap between the fan rotating portion 112 and the back cover 108 are widened. Since the approximate value of these gaps is 2.9 mm, which is the same as in the third embodiment, description thereof is omitted. In this way, since the gap around the fan rotation unit 112 is enlarged, dust does not collect in the centrifugal fan unit 103 when starting up the plasma display television, so that the problem that the fan rotation unit 112 does not rotate can be solved.
　本発明にかかる平面型ディスプレイテレビ用放熱機構は、シャーシと空冷ファンユニットとの隙間あるいはバックカバーと空冷ファンユニットとの隙間を大きく出来る。したがって、それらの隙間に埃が堆積して、空冷ファンが回転できないという課題を解消でき、特に、薄型のプラズマディスプレイテレビには、本発明は有用である。 The heat dissipating mechanism for a flat display television according to the present invention can increase the gap between the chassis and the air cooling fan unit or the gap between the back cover and the air cooling fan unit. Therefore, it is possible to solve the problem that dust accumulates in the gaps and the air cooling fan cannot rotate, and the present invention is particularly useful for a thin plasma display television.
　１　　シャーシ
　２　　軸流ファンユニット
　３　　遠心ファンユニット
　４　　ファンモータ
　５　　プラズマディスプレイパネル
　７　　電気回路基板
　８　　バックカバー
　９　　フロントカバー
　１０　　排気口
　１２　　ファン回転部
　１３　　保護ガラス
　１８　　吸気口
　１９　　ビス
　２９　　ファン羽根
　３１　　送風ダクト
　３２　　溝
　３３　　溝
　３６　　溝
　３７　　溝
　３８　　吸い込み口
　３９　　吐き出し口
　４５　　ビス締めボス
　４６　　ビス締めボス
　４９　　吐き出し口
　５５，５６　　矢印
　７０　　板状ファンケーシング
　７１　　外囲ファンケーシング
　８０　　スポンジクッション
　８１　　スポンジクッション
　１０１　　シャーシ
　１０３　　遠心ファンユニット
　１０４　　ファンモータ
　１０５　　バックパネル
　１０６　　フロントパネル
　１０７　　電気回路基板
　１０８　　バックカバー
　１０９　　フロントカバー
　１１０　　排気口
　１１２　　ファン回転部
　１１３　　保護ガラス
　１１４　　シール
　１１５　　作業孔
　１１８　　吸気口
　１１９　　ビス
　１２１　　モータ固定部
　１２２　　モータ回路基板
　１２３　　コイル
　１２４　　鉄心
　１２５　　磁石
　１２６　　バックヨーク
　１２７　　ラジアル軸受け部
　１２８　　回転軸
　１２９　　ファン羽根
　１３０　　外囲ファンケーシング
　１３１　　送風ダクト
　１３２　　溝
　１３４　　板状ファンケーシング
　１３５　　スラスト軸受け部
　１３８　　吸い込み口
　１３９　　吐き出し口
　１４０　　ビス締めボス
　１４１　　ビス締めボス
　１４２　　ビス締めボス
　１４３　　ビス締めボス
　１４４　　スペーサー
　１５０　　電気配線
　１５１　　コネクタ凸部
　１５２　　コネクタ凹部
　１５５，１５６　　矢印
　１６５　　ラジアル軸受け挿入孔
　１６６　　鉄心取り付け円筒面
　１６７　　モータ回路基板受け面
　１６８　　ファンケーシング
　ｒ１　　ファンケーシング孔内半径
　ｒ２　　ファンケーシング孔外半径
　ｒ３　　シャーシ溝内半径
　ｒ４　　シャーシ溝外半径
　ｒ５　　バックカバー溝内半径
　ｒ６　　バックカバー溝外半径
　ｒ７　　内半径
　ｒ８　　外半径 DESCRIPTION OF SYMBOLS 1 Chassis 2 Axial fan unit 3 Centrifugal fan unit 4 Fan motor 5 Plasma display panel 7 Electric circuit board 8 Back cover 9 Front cover 10 Exhaust port 12 Fan rotating part 13 Protective glass 18 Inlet port 19 Screw 29 Fan blade 31 Fan duct 31 Groove 33 groove 36 groove 37 groove 38 suction port 39 discharge port 45 screw tightening boss 46 screw tightening boss 49 discharge port 55, 56 arrow 70 plate fan casing 71 outer fan casing 80 sponge cushion 81 sponge cushion 101 chassis 103 centrifugal fan unit 104 fan motor 105 back panel 106 front panel 107 electric circuit board 108 back cover 109 front cover 110 exhaust port 1 2 Fan rotating part 113 Protective glass 114 Seal 115 Working hole 118 Air inlet 119 Screw 121 Motor fixing part 122 Motor circuit board 123 Coil 124 Iron core 125 Magnet 126 Back yoke 127 Radial bearing part 128 Rotating shaft 129 Fan blade 130 Surrounding fan casing 131 Air blow duct 132 Groove 134 Plate fan casing 135 Thrust bearing portion 138 Suction port 139 Exhaust port 140 Screw tightening boss 141 Screw tightening boss 142 Screw tightening boss 143 Screw tightening boss 144 Spacer 150 Electric wiring 151 Connector convex portion 152 Connector concave portion 155, 156 Arrow 165 Radial bearing insertion hole 166 Iron core mounting cylindrical surface 167 Motor circuit board receiving surface 168 Fan casein R1 Fan casing hole inner radius r2 Fan casing hole outer radius r3 Chassis groove inner radius r4 Chassis groove outer radius r5 Back cover groove inner radius r6 Back cover groove outer radius r7 Inner radius r8 Outer radius

Claims (11)

  1. 平面型ディスプレイテレビの金属製のシャーシとバックカバーの間に空冷ファンユニットを備える平面型ディスプレイテレビ用放熱機構であって、
    前記空冷ファンユニットは、
    　前記モータベース部に設置されるファンモータと、
    　前記ファンモータの回転軸と同心のファン羽根と、
    を備え、
    　前記シャーシ、あるいは前記バックカバーを、前記空冷ファンユニットを固定するモータベース部とする平面型ディスプレイテレビ用放熱機構。     A heat dissipating mechanism for a flat panel display TV comprising an air cooling fan unit between a metal chassis of the flat panel display TV and a back cover,
    The air cooling fan unit is
    A fan motor installed in the motor base,
    Fan blades concentric with the rotation axis of the fan motor;
    With
    A heat dissipating mechanism for a flat panel display TV, wherein the chassis or the back cover is a motor base portion for fixing the air cooling fan unit.
  2. 前記シャーシと前記ファン羽根との間に配置され、前記モータベース部に固定されている板状ファンケーシングと、
    前記ファン羽根の外周であって、前記ファン羽根の回転軸と垂直方向の外周を囲む外囲ファンケーシングと
    を更に備え、
    前記板状ファンケーシングは、前記ファン羽根の回転により空気を吸い込む吸い込み口を有する請求項１に記載の平面型ディスプレイテレビ用放熱機構。     A plate-shaped fan casing disposed between the chassis and the fan blades and fixed to the motor base;
    An outer fan casing that is an outer periphery of the fan blade and surrounds an outer periphery in a direction perpendicular to a rotation axis of the fan blade;
    2. The flat panel display TV heat dissipation mechanism according to claim 1, wherein the plate-shaped fan casing has a suction port for sucking air by rotation of the fan blades.
  3. 前記外囲ファンケーシングは、前記バックカバーの排気孔につながる送風ダクトに合わさるように固定する請求項２に記載の平面型ディスプレイテレビ用放熱機構。 The flat panel display TV heat dissipating mechanism according to claim 2, wherein the outer fan casing is fixed so as to be fitted to a blower duct connected to an exhaust hole of the back cover.
  4. 前記ファン羽根は、回転中心から遠心方向に空気を吐き出す遠心ファン方式であることを特徴とする請求項２に記載の平面型ディスプレイテレビ用放熱機構。 The heat dissipation mechanism for a flat display television according to claim 2, wherein the fan blades are of a centrifugal fan type that discharges air in a centrifugal direction from a rotation center.
  5. 前記シャーシは、
    　前記吸い込み口に対面する側に、前記ファンモータの回転軸と同心の溝を有する請求項２に記載の平面型ディスプレイテレビ用放熱機構。     The chassis is
    The heat dissipating mechanism for a flat display television according to claim 2, further comprising a groove concentric with a rotation shaft of the fan motor on a side facing the suction port.
  6. 平面型ディスプレイテレビの金属製のシャーシとバックカバーの間に空冷ファンユニットを備える平面型ディスプレイテレビ用放熱機構であって、
    前記シャーシは、
    　前記空冷ファンユニットの吸気口に対面する側に、ファンモータの回転軸と同心の溝を有する
    平面型ディスプレイテレビ用放熱機構。     A heat dissipating mechanism for a flat panel display TV comprising an air cooling fan unit between a metal chassis of the flat panel display TV and a back cover,
    The chassis is
    A flat panel display heat dissipating mechanism having a groove concentric with a rotation axis of a fan motor on a side facing the air inlet of the air cooling fan unit.
  7. 前記溝は、円形、あるいは、円環形状、あるいは、前記回転軸から放射状に広がる複数の扇形状である請求項６に記載の平面型ディスプレイテレビ用放熱機構。 The heat dissipating mechanism for a flat display television according to claim 6, wherein the groove has a circular shape, an annular shape, or a plurality of fan shapes extending radially from the rotation axis.
  8. 前記溝の外径が、前記空冷ファンユニットの吸気口の外径より大きい請求項６に記載の平面型ディスプレイテレビ用放熱機構。 The heat dissipating mechanism for a flat display television according to claim 6, wherein an outer diameter of the groove is larger than an outer diameter of an air inlet of the air cooling fan unit.
  9. 前記溝の体積は、前記溝の外径円の面積と前記シャーシの厚みの積の１０％以上５０％以下である請求項６に記載の平面型ディスプレイテレビ用放熱機構。 7. The heat dissipation mechanism for a flat display television according to claim 6, wherein a volume of the groove is 10% or more and 50% or less of a product of an area of an outer diameter circle of the groove and a thickness of the chassis.
  10. 前記空冷ファンユニットは、前記バックカバーに対面する側に、さらに吸気口を備え、
    前記バックカバーは、前記空冷ファンユニットの前記吸気口に対面する側に、前記ファンモータの前記回転軸と同心の溝を有する請求項６に記載の平面型ディスプレイテレビ用放熱機構。     The air cooling fan unit further includes an air inlet on the side facing the back cover,
    The flat panel display television heat dissipation mechanism according to claim 6, wherein the back cover has a groove concentric with the rotation shaft of the fan motor on a side facing the air inlet of the air cooling fan unit.
  11. 前記溝の外径が、前記空冷ファンユニットの前記吸気口の外径より大きい請求項１０に記載の平面型ディスプレイテレビ用放熱機構。 The heat dissipation mechanism for a flat display television according to claim 10, wherein an outer diameter of the groove is larger than an outer diameter of the air inlet of the air cooling fan unit.
PCT/JP2009/002350 2008-05-30 2009-05-28 Heat dissipating mechanism for flat display television set WO2009144937A1 (en)

Applications Claiming Priority (4)

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JP2008141927A JP2011166190A (en) 2008-05-30 2008-05-30 Heat dissipation mechanism for flat type display television set
JP2008-141926 2008-05-30
JP2008141926A JP2011166189A (en) 2008-05-30 2008-05-30 Heat dissipation mechanism for flat display television set
JP2008-141927 2008-05-30

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US20110063799A1 (en) * 2008-05-15 2011-03-17 Kazuyuki Takahasi Fan and electronic device equipped with the same
CN104811636A (en) * 2015-03-18 2015-07-29 康佳集团股份有限公司 External reflection type laser television and reflection mirror protective device thereof
JP2018010241A (en) * 2016-07-15 2018-01-18 東京電力ホールディングス株式会社 Signage device
CN109996402A (en) * 2019-04-02 2019-07-09 嘉兴歆瑶商贸有限公司 A kind of multimedia equipment being safely and reliably used for smart home
CN111148394A (en) * 2020-01-16 2020-05-12 东阳仙怀通讯科技有限公司 Wireless communication network device with detachable machine body
CN116916633A (en) * 2023-09-11 2023-10-20 深圳市德兰明海新能源股份有限公司 Resonant converter and energy storage power supply

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JP2002057480A (en) * 2000-08-11 2002-02-22 Fujitsu General Ltd Cooling unit and display device comprising the same
JP2006058679A (en) * 2004-08-20 2006-03-02 Sharp Corp Flat panel display device

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JP2006058679A (en) * 2004-08-20 2006-03-02 Sharp Corp Flat panel display device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110063799A1 (en) * 2008-05-15 2011-03-17 Kazuyuki Takahasi Fan and electronic device equipped with the same
US8508939B2 (en) * 2008-05-15 2013-08-13 Panasonic Corporation Fan and electronic device equipped with the same
CN104811636A (en) * 2015-03-18 2015-07-29 康佳集团股份有限公司 External reflection type laser television and reflection mirror protective device thereof
JP2018010241A (en) * 2016-07-15 2018-01-18 東京電力ホールディングス株式会社 Signage device
CN109996402A (en) * 2019-04-02 2019-07-09 嘉兴歆瑶商贸有限公司 A kind of multimedia equipment being safely and reliably used for smart home
CN109996402B (en) * 2019-04-02 2020-11-24 王锐 Multimedia equipment for smart home
CN111148394A (en) * 2020-01-16 2020-05-12 东阳仙怀通讯科技有限公司 Wireless communication network device with detachable machine body
CN116916633A (en) * 2023-09-11 2023-10-20 深圳市德兰明海新能源股份有限公司 Resonant converter and energy storage power supply
CN116916633B (en) * 2023-09-11 2023-12-29 深圳市德兰明海新能源股份有限公司 Resonant converter and energy storage power supply

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