EP1574716A1 - Blower - Google Patents
Blower Download PDFInfo
- Publication number
- EP1574716A1 EP1574716A1 EP05004577A EP05004577A EP1574716A1 EP 1574716 A1 EP1574716 A1 EP 1574716A1 EP 05004577 A EP05004577 A EP 05004577A EP 05004577 A EP05004577 A EP 05004577A EP 1574716 A1 EP1574716 A1 EP 1574716A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hub
- projection
- shroud
- blade
- blower
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
Definitions
- the present invention relates to a centrifugal turbo type blower.
- Centrifugal turbo type blowers are used for ceiling type or cassette type air conditioners and various ventilators.
- FIGS. 20 to 23 Japanese Patent Application Laid-open No.2001-263294.
- a rotation body 2 is rotated by a motor 1, and the rotation body 2 includes a hub 3, a plurality of blades 4 which are radially mounted on an outer periphery of the hub 3, and a shroud 5 disposed on an opposite side from the hub 3 for connecting the blades 4 to one another.
- the shroud 5 is formed into such a shape that a portion between the adjacent blades 4 becomes an inclined surface 6 in a stepwise manner, the separation region of air from the negative pressure surface of the blade 4 is reduced, thereby reducing the noise.
- the present invention has been achieved to solve the conventional problem, and has object to provide a blower capable of further reducing a separation region of air from a negative pressure surface of a blade.
- the present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to the hub side.
- the present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to the hub side, the projection having a height being reduced from the shroud side toward the hub side.
- the present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to the hub side, the projection having a height being the same from the shroud side to the hub side and a width being reduced from the shroud side toward the hub side, the width being in a direction from an inner peripheral side to an outer peripheral side of the hub.
- the present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to a midpoint toward the hub side.
- the present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to a midpoint toward the hub side, the projection having a height being reduced from the shroud side toward the hub side.
- the present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to a midpoint toward the hub side, and the projection has a height being reduced from the shroud side toward the hub side and a width being reduced from the shroud side toward the hub side, the width being in a direction from an inner peripheral side to an outer peripheral side of the hub.
- a plurality of blades are radially disposed between a hub and a shroud, and each blade has a substantially half-wing shaped projection formed on a negative pressure surface of its outer periphery portion. Airflow which is once separated again adheres to the projection and flows along the blade, turbulence on the discharge side is reduced, noise is reduced, and volume of air is increased.
- Embodiments of the present invention will be explained based on FIGS. 1 to 19, and 24.
- FIGS. 1 to 4 show a blower according to the first embodiment of the present invention.
- a rotation body 2 is rotated by a motor 1, and the rotation body 2 includes a hub 3, a plurality of blades 4 which are radially mounted on an outer periphery of the hub 3, and a shroud 5 disposed on an opposite side from the hub 3 for connecting the blades 4 to one another.
- the arrow A shows a rotation direction.
- Substantially one-wing shaped projections 8 are formed on an outer periphery of negative pressure surfaces of the blades 4.
- FIG. 2 is a sectional view of the blade 4.
- a phantom line 9 shows a shape of the conventional blade formed with no projection 8.
- a maximum height portion of the projection 8 is disposed at outer side of a substantially central portion 10 of the projection 8.
- FIGS. 3 and 4 show detailed shapes of the blade 4 and the projection 8 formed on the blade 4.
- FIG. 4A is a front view of the blade 4 on the side of the negative pressure surface.
- FIGS. 4B, 4C and 4D are sectional views of an upper portion, a central portion and a lower portion of the blade 4.
- FIGS. 5 to 7 show a blower according to the second embodiment of the present invention.
- FIG. 5 is a perspective view of the blower, and a portion of the shape of the projection 8 is different from that of the first embodiment. Other portions are the same.
- FIG. 6 is an enlarged view of an essential portion of the blower.
- FIG. 7A is a front view of the blade 4 on the side of the negative pressure surface.
- FIGS. 7B, 7C and 7D are sectional views of an upper portion, a central portion and a lower portion of the blade 4, respectively.
- FIGS. 8 to 10 shows a blower according to the third embodiment of the present invention.
- FIG. 8 is a perspective view of the blower, and a portion of the shape of the projection 8 is different from that of the first embodiment. Other portions are the same.
- FIG. 9 is an enlarged view of an essential portion of the blower.
- FIG. 10A is a front view of the blade 4 on the side of the negative pressure surface.
- FIGS. 10B, 10C and 10D are sectional views of an upper portion, a central portion and a lower portion of the blade 4, respectively.
- FIGS. 11 to 13 show a blower according to the fourth embodiment of the present invention.
- FIG. 11 is a perspective view of the blower, and a portion of the shape of the projection 8 is different from that of the first embodiment. Other portions are the same.
- FIG. 12 is an enlarged view of an essential portion of the blower.
- FIG. 13A is a front view of the blade 4 on the side of the negative pressure surface.
- FIGS. 13B, 13C and 13D are sectional views of an upper portion, a central portion and a lower portion of the blade 4, respectively.
- FIGS. 14 to 16 show a blower according to the fifth embodiment of the present invention.
- FIG. 14 is a perspective view of the blower, and a portion of the shape of the projection 8 is different from that of the first embodiment. Other portions are the same.
- FIG. 15 is an enlarged view of an essential portion of the blower.
- FIG. 16A is a front view of the blade 4 on the side of the negative pressure surface.
- FIGS. 16B, 16C and 16D are sectional views of an upper portion, a central portion and a lower portion of the blade 4, respectively.
- FIGS. 17 to 19 show a blower according to the sixth embodiment of the present invention.
- FIG. 17 is a perspective view of the blower, and a portion of the shape of the projection 8 is different from that of the first embodiment. Other portions are the same.
- FIG. 18 is an enlarged view of an essential portion of the blower.
- FIG. 19A is a front view of the blade 4 on the side of the negative pressure surface.
- FIGS. 19B, 19C and 19D are sectional views of an upper portion, a central portion and a lower portion of the blade 4, respectively.
- FIGS. 24 show another concrete example according to the fourth embodiment shown in FIGS. 11 to 13.
- a cross sectional shape of the blade taken along the line K1-K1 passing through the projection 8 which is formed from the shroud 5 to a midpoint is formed such that the wing thickness is gently increased from a front edge F1 of the blade 4 along a rear edge E1 as shown in FIG. 24B, the blade wing thickness becomes maximum at a point P1 and then, is reduced on the opposite side gently to a point P2.
- the wing thickness on the side of the negative pressure surface is increased, and the wing thickness becomes maximum at the rear edge E1 from the point P2 in a point P3.
- the cross sectional shape of the blade taken along the line K2-K2 passing through the projection 8 which is formed from the shroud 5 to the midpoint is formed as shown in FIG. 24C.
- the blade 4 of the seventh embodiment is formed such that the wing thickness becomes constricted at the point 2 which is a boundary with respect to the projection 8 to the midpoint to the rear edge E1 from the front edge F1.
- the projection 8 extends from the point P2 to the rear edge E1, and the position of the maximum wing thickness point (point P3) is located (outside of the blower) closer to the rear edge E1 than the substantially central portion of the projection 8.
- the seventh embodiment is a different example from the fourth embodiment
- the shape of the projection 8 of the blade 4 shown FIG. 4 in the first embodiment the shape of the projection 8 of the blade 4 shown in FIG. 7 in the second embodiment, and the shape of the projection 8 of the blade 4 shown in FIG. 10 in the third embodiment can also be employed.
- the present invention can be applied to blowers of ceiling type or cassette type air conditioners and various ventilators.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The present invention relates to a centrifugal turbo type blower.
- Centrifugal turbo type blowers are used for ceiling type or cassette type air conditioners and various ventilators.
- A conventional blower is shown in FIGS. 20 to 23 (Japanese Patent Application Laid-open No.2001-263294).
- As shown in FIG. 20, in a general blower of this kind, a
rotation body 2 is rotated by amotor 1, and therotation body 2 includes ahub 3, a plurality ofblades 4 which are radially mounted on an outer periphery of thehub 3, and ashroud 5 disposed on an opposite side from thehub 3 for connecting theblades 4 to one another. - According to this structure, when the
rotation body 2 is rotates in a direction of the arrow A, separation of airflow is generated around a negative pressure surface of theblade 4 in the vicinity of the connection portion between theblade 4 and theshroud 5 as shown with hatchings B in FIG. 21 and thus, noise is high. - Thereupon, as shown in FIGS. 22 and 23, the
shroud 5 is formed into such a shape that a portion between theadjacent blades 4 becomes aninclined surface 6 in a stepwise manner, the separation region of air from the negative pressure surface of theblade 4 is reduced, thereby reducing the noise. - If the rotating body is formed as shown in FIGS. 22 and 23, the noise can be reduced, but since the
shroud 5 is formed in the stepwise manner to form theinclined surface 6,air turbulence 7 is generated at that portion. - The present invention has been achieved to solve the conventional problem, and has object to provide a blower capable of further reducing a separation region of air from a negative pressure surface of a blade.
- The present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to the hub side.
- The present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to the hub side, the projection having a height being reduced from the shroud side toward the hub side.
- The present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to the hub side, the projection having a height being the same from the shroud side to the hub side and a width being reduced from the shroud side toward the hub side, the width being in a direction from an inner peripheral side to an outer peripheral side of the hub.
- The present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to a midpoint toward the hub side.
- The present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to a midpoint toward the hub side, the projection having a height being reduced from the shroud side toward the hub side.
- The present invention provides a blower in which a plurality of blades are radially disposed between a hub and a shroud, wherein each blade has a substantially half-wing shaped projection formed on a negative pressure surface of an outer periphery portion thereof to extend from the shroud side to a midpoint toward the hub side, and the projection has a height being reduced from the shroud side toward the hub side and a width being reduced from the shroud side toward the hub side, the width being in a direction from an inner peripheral side to an outer peripheral side of the hub.
- According to the present invention, a plurality of blades are radially disposed between a hub and a shroud, and each blade has a substantially half-wing shaped projection formed on a negative pressure surface of its outer periphery portion. Airflow which is once separated again adheres to the projection and flows along the blade, turbulence on the discharge side is reduced, noise is reduced, and volume of air is increased.
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- FIG. 1 is a perspective view of a blower according to a first embodiment of the present;
- FIG. 2 is a sectional view of the blade of the embodiment;
- FIG. 3 is an enlarged view of an essential part of FIG. 1;
- FIGS. 4A, 4B, 4C and 4D are a front view, a sectional view of an upper portion, a sectional view of a central portion and a sectional view of a lower portion, respectively of the blower of the embodiment;
- FIG. 5 is a perspective view of a blower according to a second embodiment of the present invention;
- FIG. 6 is an enlarged view of an essential part of FIG. 5;
- FIGS. 7A, 7B, 7C and 7D are a front view, a sectional view of an upper portion, a sectional view of a central portion and a sectional view of a lower portion, respectively of the blower of the embodiment;
- FIG. 8 is a perspective view of a blower according to a third embodiment of the present invention;
- FIG. 9 is an enlarged view of an essential part of FIG. 8;
- FIGS. 10A, 10B, 10C and 10D are a front view, a sectional view of an upper portion, a sectional view of a central portion and a sectional view of a lower portion, respectively of the blower of the embodiment;
- FIG. 11 is a perspective view of a blower according to a fourth embodiment of the present invention;
- FIG. 12 is an enlarged view of an essential part of FIG. 11;
- FIGS. 13A, 13B, 13C and 13D are a front view, a sectional view of an upper portion, a sectional view of a central portion and a sectional view of a lower portion, respectively of the blower of the embodiment;
- FIG. 14 is a perspective view of a blower according to a fifth embodiment of the present invention;
- FIG. 15 is an enlarged view of an essential part of FIG. 14;
- FIGS. 16A, 16B, 16C and 16D are a front view, a sectional view of an upper portion, a sectional view of a central portion and a sectional view of a lower portion, respectively of the blower of the embodiment;
- FIG. 17 is a perspective view of a blower according to a sixth embodiment of the present invention;
- FIG. 18 is an enlarged view of an essential part of FIG. 17;
- FIGS. 19A, 19B, 19C and 19D are a front view, a sectional view of an upper portion, a sectional view of a central portion and a sectional view of a lower portion, respectively of the blower of the embodiment;
- FIG. 20 is a sectional view of a conventional blower;
- FIG. 21 is a front view of the conventional blower;
- FIG. 22 is a perspective view of another conventional example;
- FIG. 23 is a front view of FIG. 22; and
- FIGS. 24A, 24B and 24C are a front view, a sectional view of an upper portion and a sectional view of a central portion, respectively of a blower according to a seven embodiment of the present invention.
-
- Embodiments of the present invention will be explained based on FIGS. 1 to 19, and 24.
- FIGS. 1 to 4 show a blower according to the first embodiment of the present invention.
- As shown in FIG. 1, a
rotation body 2 is rotated by amotor 1, and therotation body 2 includes ahub 3, a plurality ofblades 4 which are radially mounted on an outer periphery of thehub 3, and ashroud 5 disposed on an opposite side from thehub 3 for connecting theblades 4 to one another. - The arrow A shows a rotation direction. Substantially one-wing
shaped projections 8 are formed on an outer periphery of negative pressure surfaces of theblades 4. FIG. 2 is a sectional view of theblade 4. Aphantom line 9 shows a shape of the conventional blade formed with noprojection 8. A maximum height portion of theprojection 8 is disposed at outer side of a substantiallycentral portion 10 of theprojection 8. - FIGS. 3 and 4 show detailed shapes of the
blade 4 and theprojection 8 formed on theblade 4. Theprojection 8 of eachblade 4 is formed such that a width of theprojection 8 from an inner peripheral side to an outer peripheral side of thehub 3 are the same (W1=W2=W3) over the entire height of theblade 4, and a height of theprojection 8 is the same (H1=H2=H3). FIG. 4A is a front view of theblade 4 on the side of the negative pressure surface. FIGS. 4B, 4C and 4D are sectional views of an upper portion, a central portion and a lower portion of theblade 4. - According to this structure, since the
projections 8 are formed on theblades 4 on the side of the negative pressure surface, airflow which is once separated adheres again and flows along theblade 4. Therefore, even if theshroud 5 is not formed in the stepwise manner as in the conventional technique, the separation region of air from the negative pressure surface of theblade 4 can extremely be reduced, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. - FIGS. 5 to 7 show a blower according to the second embodiment of the present invention.
- FIG. 5 is a perspective view of the blower, and a portion of the shape of the
projection 8 is different from that of the first embodiment. Other portions are the same. FIG. 6 is an enlarged view of an essential portion of the blower. - FIG. 7A is a front view of the
blade 4 on the side of the negative pressure surface. FIGS. 7B, 7C and 7D are sectional views of an upper portion, a central portion and a lower portion of theblade 4, respectively. - The
projection 8 of theblade 4 of the second embodiment is formed such that a width of theprojection 8 from an inner peripheral side to an outer peripheral side of thehub 3 are the same (W1=W2=W3) over the entire height of theblade 4, but a height of theprojection 8 is gradually reduced toward the hub 3 (H1>H2>H3). - With this structure, airflow which is once separated again adheres to the substantially one-wing shaped
projection 8 in which its maximum height is located at the outer side of the substantially central portion over the entire height of the blade on the side of the negative pressure surface of theblade 4, and the airflow flows along theprojection 8. Therefore, the separation region of air from the negative pressure surface of theblade 4 is reduced, and the height of theprojection 8 on the side of thehub 3 is lowered and thus, reduction in the volume of air can be suppressed. That is, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. With this, noise can be reduced. - FIGS. 8 to 10 shows a blower according to the third embodiment of the present invention.
- FIG. 8 is a perspective view of the blower, and a portion of the shape of the
projection 8 is different from that of the first embodiment. Other portions are the same. FIG. 9 is an enlarged view of an essential portion of the blower. - FIG. 10A is a front view of the
blade 4 on the side of the negative pressure surface. FIGS. 10B, 10C and 10D are sectional views of an upper portion, a central portion and a lower portion of theblade 4, respectively. - The
projection 8 of theblade 4 of the third embodiment is formed such that the maximum height over the entire height of the blade is the same (H1=H2=H3), but the width of theprojection 8 from the inner peripheral side toward the outer peripheral side is reduced toward the hub 3 (W1>W2>W3). - With this structure, airflow which is once separated again adheres to the substantially one-wing shaped
projection 8 in which its maximum height is located at the outer side of the substantially central portion over the entire height of the blade on the side of the negative pressure surface of theblade 4, and the airflow flows along theprojection 8. Therefore, the separation region of air from the negative pressure surface of theblade 4 can extremely be reduced. That is, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. Since the width of theprojection 8 on the side of thehub 3 is reduced, the reduction of volume of air can be suppressed. That is, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. With this, noise can be reduced. - FIGS. 11 to 13 show a blower according to the fourth embodiment of the present invention.
- FIG. 11 is a perspective view of the blower, and a portion of the shape of the
projection 8 is different from that of the first embodiment. Other portions are the same. FIG. 12 is an enlarged view of an essential portion of the blower. - FIG. 13A is a front view of the
blade 4 on the side of the negative pressure surface. FIGS. 13B, 13C and 13D are sectional views of an upper portion, a central portion and a lower portion of theblade 4, respectively. - The
projection 8 of theblade 4 of the fourth embodiment is formed such that theprojection 8 is not formed over the entire height of the blade but is formed to a midpoint from the side of theshroud 5, and the width of theprojection 8 from the inner peripheral side to the outer peripheral side of thehub 3 is the same (W1=W2), and the maximum height of theprojection 8 is the same (H1=H2). - With this structure, airflow which is once separated from the
projection 8 on the side of the negative pressure surface again adheres and flows along theprojection 8. Thus, the separation region of air from the negative pressure surface of theblade 4 can be reduced. Further, the length of theprojection 8 on the side of theshroud 5 is set to an appropriate position. With this, the reduction in the volume of air can be suppressed. That is, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. With this, noise can be reduced. - FIGS. 14 to 16 show a blower according to the fifth embodiment of the present invention.
- FIG. 14 is a perspective view of the blower, and a portion of the shape of the
projection 8 is different from that of the first embodiment. Other portions are the same. FIG. 15 is an enlarged view of an essential portion of the blower. - FIG. 16A is a front view of the
blade 4 on the side of the negative pressure surface. FIGS. 16B, 16C and 16D are sectional views of an upper portion, a central portion and a lower portion of theblade 4, respectively. - The
projection 8 of theblade 4 of the fifth embodiment is formed such that theprojection 8 is not formed over the entire height of the blade but is formed to a midpoint from the side of theshroud 5, and the width of theprojection 8 from the inner peripheral side to the outer peripheral side of thehub 3 is the same (W1=W2), and the maximum height of theprojection 8 is reduced toward the hub 3 (H1>H2). - With this structure, airflow which is once separated on the side of the negative pressure surface again adheres to the
projection 8 and flows along theprojection 8. Thus, the separation region of air from the negative pressure surface of theblade 4 can be reduced. Further, the length of theprojection 8 on the side of theshroud 5 is set to an appropriate position, and the height of theprojection 8 on the side of thehub 3 is reduced. With this, the reduction in the volume of air can be suppressed. That is, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. With this, noise can be reduced. Thus, the effect of the first to fourth embodiments is enhanced, whereby noise can be reduced and the volume of air is increased. - FIGS. 17 to 19 show a blower according to the sixth embodiment of the present invention.
- FIG. 17 is a perspective view of the blower, and a portion of the shape of the
projection 8 is different from that of the first embodiment. Other portions are the same. FIG. 18 is an enlarged view of an essential portion of the blower. - FIG. 19A is a front view of the
blade 4 on the side of the negative pressure surface. FIGS. 19B, 19C and 19D are sectional views of an upper portion, a central portion and a lower portion of theblade 4, respectively. - The
projection 8 of theblade 4 of the sixth embodiment is formed such that theprojection 8 is not formed over the entire height of the blade but is formed to a midpoint from the side of theshroud 5, and the width of theprojection 8 from the inner peripheral side to the outer peripheral side of thehub 3 is reduced toward the hub 3 (W1>W2), and the maximum height of theprojection 8 is the same (H1=H2). - With this structure, airflow which is once separated on the side of the negative pressure surface again adheres to the
projection 8 and flows along theprojection 8. Thus, the separation region of air from the negative pressure surface of theblade 4 can be reduced. Further, the length of theprojection 8 on the side of theshroud 5 is set to an appropriate position, and the width of theprojection 8 on the side of thehub 3 is reduced. With this, the reduction in the volume of air can be suppressed. That is, turbulence is not generated almost at all on the discharging side of the blower, and the volume of air is increased. With this, noise can be reduced. Thus, the effect of the first to fourth embodiments is enhanced, whereby noise can be reduced and the volume of air is increased. - FIGS. 24 show another concrete example according to the fourth embodiment shown in FIGS. 11 to 13.
- As in the side of the negative pressure surface of the
blade 4 shown in FIG. 24A, a cross sectional shape of the blade taken along the line K1-K1 passing through theprojection 8 which is formed from theshroud 5 to a midpoint is formed such that the wing thickness is gently increased from a front edge F1 of theblade 4 along a rear edge E1 as shown in FIG. 24B, the blade wing thickness becomes maximum at a point P1 and then, is reduced on the opposite side gently to a point P2. At the point P2, the wing thickness on the side of the negative pressure surface is increased, and the wing thickness becomes maximum at the rear edge E1 from the point P2 in a point P3. The cross sectional shape of the blade taken along the line K2-K2 passing through theprojection 8 which is formed from theshroud 5 to the midpoint is formed as shown in FIG. 24C. - The
blade 4 of the seventh embodiment is formed such that the wing thickness becomes constricted at thepoint 2 which is a boundary with respect to theprojection 8 to the midpoint to the rear edge E1 from the front edge F1. - That is, the
projection 8 extends from the point P2 to the rear edge E1, and the position of the maximum wing thickness point (point P3) is located (outside of the blower) closer to the rear edge E1 than the substantially central portion of theprojection 8. - With this shape, even if air which flows along the surface of the
blade 4 separates, the air reliably adheres to the surface of theblade 4 and thus, swirl is prevented from being generated and noise can be reduced. - Although the seventh embodiment is a different example from the fourth embodiment, the shape of the
projection 8 of theblade 4 shown FIG. 4 in the first embodiment, the shape of theprojection 8 of theblade 4 shown in FIG. 7 in the second embodiment, and the shape of theprojection 8 of theblade 4 shown in FIG. 10 in the third embodiment can also be employed. - The present invention can be applied to blowers of ceiling type or cassette type air conditioners and various ventilators.
Claims (6)
- A blower comprising a hub (3), a shroud (5), and a plurality of blades (4) radially disposed between the hub and the shroud (5), characterized in that
each blade (4) has a substantially half-wing shaped projection (8) formed on a negative pressure surface of an outer periphery portion thereof, the projection (8) extending from the shroud side toward the hub side. - A blower comprising a hub (3), a shroud (5), and a plurality of blades (4) radially disposed between the hub (3) and the shroud (5), characterized in that
each blade (4) has a substantially half-wing shaped projection (8) formed on a negative pressure surface of an outer periphery portion thereof, the projection (8) extending from the shroud side toward the hub side and being reduced in height from the shroud side toward the hub side. - A blower comprising a hub (3), a shroud (5), and a plurality of blades (4) radially disposed between the hub (3) and the shroud (5), characterized in that
each blade (4) has a substantially half-wing shaped projection (8) formed on a negative pressure surface of an outer periphery portion thereof, the projection (8) being the same in height from the shroud side toward the hub side and being reduced in width from the shroud side toward the hub side, the width being in a direction from an inner peripheral side to an outer peripheral side of the hub. - A blower comprising a hub (3), a shroud (5), and a plurality of blades (4) radially disposed between the hub (3) and the shroud (5), characterized in that
each blade (4) has a substantially half-wing shaped projection (8) formed on a negative pressure surface of an outer periphery portion thereof, the projection (8) extending from the shroud side to a midpoint toward the hub side. - A blower comprising a hub (3), a shroud (5), and a plurality of blades (4) radially disposed between the hub (3) and the shroud (5), characterized in that
each blade (4) has a substantially half-wing shaped projection (8) formed on a negative pressure surface of an outer periphery portion thereof, the projection (8) extending from the shroud side to a midpoint toward the hub side and being reduced in height from the shroud side toward the hub side. - A blower comprising a hub (3), a shroud (5), and a plurality of blades (4) radially disposed between the hub (3) and the shroud (5), characterized in that
each blade (4) has a substantially half-wing shaped projection (8) formed on a negative pressure surface of an outer periphery portion thereof, the projection (8) extending from the shroud side to a midpoint toward the hub side, the projection (8) being reduced in height from the shroud side toward the hub side and being reduced in width from the shroud side toward the hub side, the width being in a direction from an inner peripheral side toward an outer peripheral side of the hub.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004061493 | 2004-03-05 | ||
JP2004061493 | 2004-03-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1574716A1 true EP1574716A1 (en) | 2005-09-14 |
EP1574716B1 EP1574716B1 (en) | 2008-08-13 |
Family
ID=34824511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05004577A Expired - Fee Related EP1574716B1 (en) | 2004-03-05 | 2005-03-02 | Blower |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1574716B1 (en) |
CN (1) | CN100485193C (en) |
ES (1) | ES2309608T3 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2363609A1 (en) * | 2010-02-26 | 2011-09-07 | ebm-papst Mulfingen GmbH & Co. KG | Radial or diagonal ventilator wheel |
CN102374192A (en) * | 2010-08-17 | 2012-03-14 | 日本电产伺服有限公司 | Fan |
US8215916B2 (en) | 2007-06-28 | 2012-07-10 | Mitsubishi Electric Corporation | Axial flow fan |
CN101825113B (en) * | 2009-02-12 | 2013-05-01 | 依必安-派特穆尔芬根股份有限两合公司 | Radial or diagonal ventilator wheel |
EP2003340A4 (en) * | 2006-03-31 | 2015-12-02 | Daikin Ind Ltd | Multi-blade fan |
US9267510B2 (en) | 2009-05-08 | 2016-02-23 | Mitsubishi Electric Corporation | Centrifugal fan and air conditioner |
WO2017061540A1 (en) * | 2015-10-07 | 2017-04-13 | Minebea Mitsumi Inc. | Impeller and axial fan including the same |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202009018770U1 (en) | 2009-02-12 | 2013-03-07 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial or diagonal fan wheel |
KR101720491B1 (en) * | 2015-01-22 | 2017-03-28 | 엘지전자 주식회사 | Centrifugal Fan |
JP2016160905A (en) * | 2015-03-05 | 2016-09-05 | パナソニックIpマネジメント株式会社 | Centrifugal fan |
JP7086229B2 (en) * | 2019-01-21 | 2022-06-17 | 三菱電機株式会社 | Blower, indoor unit and air conditioner |
CN114109896B (en) * | 2021-11-26 | 2022-08-02 | 北京航空航天大学 | High-performance nonlinear symmetrical bionic centrifugal impeller applied to flow control |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB723706A (en) * | 1951-10-29 | 1955-02-09 | Bruno Eck | Improvements in rotors for radial flow fans |
DE20016414U1 (en) * | 2000-09-21 | 2001-01-04 | Ind Tech Res Inst | Leaf-shaped, three-dimensional metal wing structures formed in one piece by embossing |
US20020064460A1 (en) * | 2000-11-29 | 2002-05-30 | Industrial Technology Research Institute | Integrated 3-D blade structure |
EP1249617A2 (en) * | 2001-04-13 | 2002-10-16 | Hewlett-Packard Company | Impeller |
-
2005
- 2005-03-02 EP EP05004577A patent/EP1574716B1/en not_active Expired - Fee Related
- 2005-03-02 ES ES05004577T patent/ES2309608T3/en active Active
- 2005-03-03 CN CNB2005100531711A patent/CN100485193C/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB723706A (en) * | 1951-10-29 | 1955-02-09 | Bruno Eck | Improvements in rotors for radial flow fans |
DE20016414U1 (en) * | 2000-09-21 | 2001-01-04 | Ind Tech Res Inst | Leaf-shaped, three-dimensional metal wing structures formed in one piece by embossing |
US20020064460A1 (en) * | 2000-11-29 | 2002-05-30 | Industrial Technology Research Institute | Integrated 3-D blade structure |
EP1249617A2 (en) * | 2001-04-13 | 2002-10-16 | Hewlett-Packard Company | Impeller |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2003340A4 (en) * | 2006-03-31 | 2015-12-02 | Daikin Ind Ltd | Multi-blade fan |
US8215916B2 (en) | 2007-06-28 | 2012-07-10 | Mitsubishi Electric Corporation | Axial flow fan |
CN101825113B (en) * | 2009-02-12 | 2013-05-01 | 依必安-派特穆尔芬根股份有限两合公司 | Radial or diagonal ventilator wheel |
US8454317B2 (en) | 2009-02-12 | 2013-06-04 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial or diagonal fan wheel |
US9267510B2 (en) | 2009-05-08 | 2016-02-23 | Mitsubishi Electric Corporation | Centrifugal fan and air conditioner |
EP2363609A1 (en) * | 2010-02-26 | 2011-09-07 | ebm-papst Mulfingen GmbH & Co. KG | Radial or diagonal ventilator wheel |
CN102374192A (en) * | 2010-08-17 | 2012-03-14 | 日本电产伺服有限公司 | Fan |
CN102374192B (en) * | 2010-08-17 | 2014-12-17 | 日本电产伺服有限公司 | Fan |
WO2017061540A1 (en) * | 2015-10-07 | 2017-04-13 | Minebea Mitsumi Inc. | Impeller and axial fan including the same |
US10634162B2 (en) | 2015-10-07 | 2020-04-28 | Minebea Mitsumi Inc. | Axial fan |
Also Published As
Publication number | Publication date |
---|---|
EP1574716B1 (en) | 2008-08-13 |
CN100485193C (en) | 2009-05-06 |
ES2309608T3 (en) | 2008-12-16 |
CN1664376A (en) | 2005-09-07 |
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