CN103742429A - Axial blower - Google Patents
Axial blower Download PDFInfo
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- CN103742429A CN103742429A CN201310689782.XA CN201310689782A CN103742429A CN 103742429 A CN103742429 A CN 103742429A CN 201310689782 A CN201310689782 A CN 201310689782A CN 103742429 A CN103742429 A CN 103742429A
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- Prior art keywords
- stator blade
- edge portions
- inclination angle
- axial flow
- imaginary plane
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/0646—Details of the stator
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/542—Bladed diffusers
- F04D29/544—Blade shapes
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An axial-flow fan according to the present disclosure can increase the amount of the airflow and simultaneously reduce the noise level. A plurality of stationary blades are curved, in a convex manner, toward a rotating direction of an impeller. The plurality of stationary blades to are generally inclined so that discharge-side edge portions thereof are located more forward than suction-side edge portions thereof in the rotating direction. An inclination angle theta of each of the plurality of stationary blades to in the vicinity of the external end portion a is larger than the inclination angle theta in the vicinity of the internal end portion. The inclination angle is gradually changed from the vicinity of the external end portion a toward the vicinity of the internal end portion .
Description
Technical field
The present invention relates to a kind of axial flow fan for cooling electronic components etc.
Background technique
Figure 16 is a kind of perspective view of axial flow fan, and this axial flow fan is equipped with at the stator blade shown in Fig. 1 of U.S. design patent No.D506540 (Official Journal).Figure 17 is the rear view of the conventional axial flow fan shown in Fig. 5 of same Official Journal.As shown in these figures, in the conventional axial flow fan that is equipped with stator blade, a side of each circumferencial direction towards axle in multiple stator blades 101 is with protruding mode bending.Described multiple stator blade 101 tilts substantially, and the lateral edge portions 101 that makes to bleed is located in a side relative with the lateral edge portions of bleeding on the circumferencial direction of axle.Described multiple stator blade tilts with roughly constant angle.
But for traditional axial flow fan, it is impossible increasing throughput and reducing noise level and do not change its structure simultaneously.
Summary of the invention
The object of this invention is to provide a kind of axial flow fan, described axial flow fan can increase throughput and reduce noise level simultaneously.
Another object of the present invention is to provide a kind of axial flow fan, even if work as the distance between the object being cooled and the relief opening of axial flow fan more in short-term, described axial flow fan also can be cooling by the object being cooled up hill and dale.
According to axial flow fan of the present invention, comprising: fan guard, described fan guard comprises the air passageways with relief opening and bleeding point; There are multiple blades and be arranged on the impeller in fan guard; The rotor that impeller is fixed thereon, and described rotor encloses and pivots; The stator that respective rotor arranges; The motor body that stator is fixed thereon; Multiple stator blades with connecting engine housing and fan guard.Described motor body comprises the peripheral wall part that is positioned at the bottom wall portion of relief opening one side and forms continuously and extend towards bleeding point with bottom wall portion.Stator is fixed on bottom wall portion.Described multiple stator blade interval in the sense of rotation of rotor arranges and is positioned at the relief opening of air passageways.Each in described multiple stator blade have the inner wall section that is connected to fan guard outer end, be connected to the peripheral wall part of motor body inner end, be formed between outer end and inner end and be positioned at the discharge-side edge portions of relief opening one side, and be formed between outer end and inner end and be positioned at the lateral edge portions of bleeding of bleeding point one side.Each sense of rotation towards rotor in described multiple stator blade is bent in protruding mode.Whole or most of stator blades in described multiple stator blade tilt substantially, make the discharge-side edge portions of stator blade more forward in sense of rotation than the side part of bleeding of described stator blade.When neither one stator blade is when being contained in device wherein by the lead-in wire that is used to motor power supply, in described multiple stator blades, all there is essentially identical structure.When being used as the lead-in wire that is used to motor power supply to be contained in device wherein for one in described multiple stator blades, the multiple stator blades (that is, most of stator blades) except a described stator blade have essentially identical structure.
In axial flow fan of the present invention, whole or most of described stator blades are greater than near the inclination angle of whole or most of described stator blades inner end near inclination angle outer end, and inclination angle near outer end towards near inner end gradually change.At this, inclination angle is restricted to along the imaginary plane of relief opening with by the angle between the first intersection point and the dummy line of the second intersection point, wherein be restricted to orthogonally with described imaginary plane and crossing at described the first intersection point place with discharge-side edge portions and orthogonal orthogonal imaginary plane and the discharge-side edge portions of the lateral edge portions of bleeding, described orthogonal imaginary plane is crossing at described the second intersection point place with the lateral edge portions of bleeding.
The flow velocity of the air of discharging from the relief opening of axial flow fan is trending towards sooner apart from the nearer region of fan guard (outside), flow velocity trends towards slower in the region nearer apart from motor body (inner side).When using the stator blade of simple shape, this trend is identical.According to the present invention, by whole or most of multiple stator blades are set as mentioned above, at the flow velocity of the air-flow of the inner end Flow Structure Nearby of stator blade, with respect to the flow velocity of the air-flow of the outer end Flow Structure Nearby at stator blade, be increased.Air-flow velocity increases to inner end gradually from the outer end of stator blade.Therefore, the flow velocity of the air of discharging from relief opening is substantially by homogenization as much as possible, thereby increased throughput and reduced noise level simultaneously.
In small-sized axial flow fan, when air passageways is the shape of cross section that intercepts in the direction of vertical line at axis in the position existing from impeller when becoming large towards relief opening in the region of relief opening position, inclination angle is preferably restricted to: near inclination angle outer end can be in the scope of 50 ° to 60 °, and near inclination angle inner end can be in the scope of 45 ° to 55 °.The preferable range that one ordinarily skilled in the art will readily appreciate that each inclination angle can change according to shape (shape of air passageways) of the inner wall section of the shape of the shape of rotation blade and quantity, stator blade and quantity, fan guard etc.
A stator blade in described multiple stator blade can be formed and be used to rotor to provide the lead-in wire of electric power to be contained in wherein by many.In the case, the multiple stator blades except a described stator blade are great majority of described multiple stator blades.
The outer surface of the bottom wall portion of motor body is comparable all or the more close bleeding point of discharge-side edge portions of most of described multiple stator blades.Utilize this to arrange, along a part for the mobile air-flow of stator blade, enter in the region near motor body bottom surface, be then blown relief opening.Therefore, even by the distance between the object being cooled and the relief opening of axial flow fan more in short-term, the air of discharging from axial flow fan can be blown to relative to the motor body of axial flow fan a part for the object that is cooled, thereby cooling by the object being cooled up hill and dale.
The outer surface of the bottom wall portion of motor body comprise planar base surface and with the continuous peripheral surface part of described planar base surface.Note that it is the surface of plane that flat bottom surface not only comprises whole, also comprises that major component is the surface of plane.For example, for the bearing of back shaft, can be disposed in the center region of bottom surface.In the case, peripheral surface part is preferably shaped to the peripheral surface of the wall section bending gradually to the periphery from bottom surface.Utilize this to arrange, along stator blade, towards the mobile air of motor body, can flow to smoothly on the bottom surface of motor body.Therefore the air quantity that, flows to relief opening from the bottom surface of motor body can be increased.
Preferably, each all or in most of described multiple stator blades is included in the extension of extending on the bottom wall portion of motor body, and described extension has guiding surface, for guiding the portion of air that flows to the bottom surface of bottom wall portion along stator blade.By such guiding surface, air can actively be introduced to bottom wall portion along guiding surface (actively).
Further, described extension preferably includes extension guiding surface, and described extension guiding surface and guiding surface form continuously and extend to sense of rotation.Described extension guiding surface contributes to flow to the flow spiral on the bottom wall portion of motor body and leaves smoothly relief opening.
According to the present invention, the throughput being produced by axial flow fan can be increased and be reduced more noise level more simultaneously.
Accompanying drawing explanation
Fig. 1 is the perspective view of looking from its front side, upper right according to the axial flow fan of the embodiment of the present invention, has omitted lead-in wire here;
Fig. 2 is the plan view of the axial flow fan of embodiment shown in Fig. 1;
Fig. 3 is the rear view of the axial flow fan of embodiment shown in Fig. 1;
Fig. 4 is the right elevation of the axial flow fan shown in Fig. 2;
Fig. 5 is the cross-sectional view along the axial flow fan of Fig. 4 center line 5-5 intercepting, has wherein omitted the internal structure of motor;
Fig. 6 is the cross-sectional view along the axial flow fan of Fig. 4 center line 6-6 intercepting, has wherein omitted the internal structure of motor;
Fig. 7 is the cross-sectional view intercepting along Fig. 2 center line 7-7;
Fig. 8 illustrates the cross section of rotation blade and stator blade, to explain rotation blade and stator blade shape separately;
Fig. 9 A is the perspective view that demonstrates air flow path in this embodiment; And Fig. 9 B is the perspective view that represents air flow path in conventional layout;
Figure 10 A is the partial view of the stator blade for describing an inclination angle; Figure 10 B is near the cross-sectional view of stator blade inner end; And Figure 10 C is near the cross-sectional view of stator blade outer end;
Figure 11 A represents respectively structure and the inclination angle for the test axial flow fan of proving effect to 11C, it is by by stator blade, near the inclination angle its outer end is defined as and is greater than near the inclination angle of stator blade inner end, and from obtaining described structure and inclination angle towards changing inclination angle gradually near inner end near outer end;
Figure 12 be static pressure-Figure 11 A to the plotted curve of the measurement result of the airflow characteristic of three kinds of fans shown in 11C (wherein structure arrange identical, except the shape of stator blade and revolution remain unchanged);
Figure 13 is the form of display measurement result;
Figure 14 shows static pressure-use the respectively plotted curve of Figure 11 A to the measurement result of the airflow characteristic of three fans of the stator blade shown in Figure 11 C;
Figure 15 is the form of display measurement result;
Figure 16 is the perspective view of conventional axial flow fan;
Figure 17 is the rear view of conventional axial flow fan.
Embodiment
Hereinafter with reference to accompanying drawing, describe in detail according to axial flow fan of the present invention embodiment.Fig. 1 is the perspective view that axial flow fan 1 is looked from its front side, upper right according to an embodiment of the invention, has wherein omitted lead-in wire.Fig. 2 is the plan view of the axial flow fan 1 of embodiment shown in Fig. 1, and Fig. 3 is its rear view.Fig. 4 is the right elevation of the axial flow fan 1 shown in Fig. 2.Fig. 5 is the cross-sectional view along the axial flow fan 1 of Fig. 4 center line 5-5 intercepting, has wherein omitted the internal structure of motor.Fig. 6 is the cross-sectional view along the axial flow fan 1 of Fig. 4 center line 6-6 intercepting, has wherein omitted the internal structure of motor.Fig. 7 is the cross-sectional view intercepting along Fig. 2 center line 7-7.
With reference to these accompanying drawings, axial flow fan 1 comprises fan guard 3 and the impeller 7 of being furnished with seven rotation blades 5, and it can be rotatably set in the inside of fan guard 3.As shown in Figure 7, axial flow fan 1 further comprises that motor 9 and five stator blade 11A are to 11E.Motor 9 comprises rotor 9A and stator 9B.Rotor 9A is provided with impeller 7.In this embodiment, rotor 9A comprises rotating shaft 8 and multiple permanent magnet M, and it is fixed in the peripheral wall part that is fixedly mounted on the cup-shaped parts 12 in rotating shaft 8.Stator 9B comprises stator core and around stator core excitation winding around.Stator 9B is fixed on motor body 10.In motor body 10 inside, be provided with and be used to excitation winding to provide the circuit board of the circuit of exciting current to be installed regularly.Motor body 10 comprise be positioned at relief opening 16(it will be described later) the bottom wall portion 10A at a side place, and form continuously and will be described later to bleeding point 14(with bottom wall portion 10A) the peripheral wall part 10B that extends.The outer surface of the bottom wall portion 10A of motor body 10 comprise planar base surface 10C and with the continuous outer peripheral surface portion 10D of described planar base surface 10C.Peripheral surface part 10D is from the bottom surface 10C peripheral surface bending gradually of wall section 10B to the periphery.
Fig. 8 has illustrated the cross section of rotation blade 5 and stator blade 11C, to explain that rotation blade 5 and stator blade 11A are to 11D shape separately.In Fig. 8, solid arrow represents the sense of rotation of rotation blade 5, and dotted arrow represents respectively airflow direction.Fig. 8 has represented the viewgraph of cross-section of the stator blade 11C intercepting along Fig. 2 center line 8-8.Fig. 8 also represents the cross-sectional view of the rotation blade 5 of getting in the mode identical with the viewgraph of cross-section of stator blade 11C.With each of bending seven rotation blades 5 of mode below: sunk part 5a (is seen as clockwise towards the sense of rotation opening of impeller 7 as shown in Figure 8 from Fig. 2; From Fig. 3, be seen as counterclockwise).As shown in Figure 8, with the stator blade of mode bending below 11C:, when looking along the viewgraph of cross-section of Fig. 2 center line 8-8, sunk part is towards the direction opening contrary with the sense of rotation of impeller 7.
Five stator blade 11A to 11E at impeller 7(rotor) sense of rotation on be spaced, and be positioned at relief opening 16 inside of air passageways 19, as depicted in figs. 1 and 2.Four stator blade 11A to each of 11D have the inner wall section that is connected to fan guard 3 outer end 11a, be connected to the peripheral wall part 10B of motor body 10 inner end 11b, be formed between outer end 11a and inner end 11b and be positioned at the discharge-side edge portions 11c of relief opening 16 sides, and be formed between outer end 11a and inner end 11b and be positioned at the lateral edge portions 11d that bleeds of bleeding point 14 sides.In this embodiment, a blade 11E of stator blade has groove part 27, wherein holds a plurality of leads 25, is used to the excitation winding power supply of stator 9B.Groove part 27 is towards relief opening 16 openings.The discharge-side edge portions 11c of a described stator blade 11E comprises two edges that separate, and described edge lays respectively at groove part 27 either side places.Two edge 11c1 that separate and 11c2 tilt near inner end 11b, and the edge 11c1 that the planar base surface 10C of the bottom wall portion 10A of motor body 10 is separated with two is mutually concordant with 11c2.By such setting, lead-in wire 25 easily inserts in groove part 27.
In this embodiment, as shown in Fig. 1,2 and 7, the outer surface of the bottom wall portion 10A of motor body 10 (bottom surface 10C) arranges to the more close bleeding point 14 of discharge-side edge portions 11c of 11D than four stator blade 11A.In other words, four stator blade 11A arrange than the more close relief opening 16 of the outer surface of the bottom wall portion 10A of motor body 10 (bottom surface 10C) to the exhaust side edge section 11c of 11D.By this setting, along stator blade 11A to the mobile portion of air of 11E, flow in the region of bottom surface 10C top of motor body 10, then described air is discharged from relief opening 16, and as shown in Fig. 9 (A), wherein air flow path represents with arrow.Therefore, though by the distance between the object being cooled and the relief opening of axial flow fan 1 more in short-term, the air-flow of discharging from axial flow fan can be blown to relative to the motor body 10 of axial flow fan 1 part for the object that is cooled.Therefore, can be by thoroughly cooling by the object being cooled.For relatively, Fig. 9 (B) represents the air flow path when bottom surface that stator blade 11A ' arrives the discharge-side edge portions 11c ' of 11D ' and the bottom wall portion 10A of motor body 10 is concordant each other; That is, discharge-side edge portions 11c with the bottom surface of the bottom wall portion 10A of motor body 10 in same At The Height.The space S that Fig. 9 (B) represents is the immobilising region of air.
As shown in Fig. 1,2 and 7, four stator blade 11A are integrally formed with the extension 11e extending on the bottom wall portion 10A of motor body 10 to each of 11D.Each extension 10e has guiding surface 11f, guides the bottom surface 10C of bottom wall portion 10A for handle along stator blade 11A and the mobile portion of air of 11D into.Guiding surface 11f extends along peripheral surface part 10D, and its outer surface from the peripheral wall part 10B of motor body 10, to the bottom surface 10C bending of bottom wall portion 10A, then extends on the 10C of bottom surface.Such guiding surface 11f allows air initiatively to be guided into bottom wall portion 10C along it.Further, described extension 11e also has the guiding surface of extension 11g, and itself and guiding surface 10f form continuously and extend to the sense of rotation of impeller 7.Described extension guiding surface 11g impels the air on the bottom wall portion 10C that flows to motor body 10, from relief opening 16 spiral discharge smoothly.By guiding surface 11f being provided and extending guiding surface 11g, more substantial air flows on the bottom surface 10C of motor body 10.Even when not possessing guiding surface 11f and extending guiding surface 11g, due to bottom surface 10C than stator blade 11A the more close bleeding point in exhaust side edge to 11D, air-flow is also drawn towards the center region of motor body 10.Thus, compare with the conventional structure shown in Fig. 9 (B), more substantial air is discharged from the center region of motor body 10.
The bottom surface 10C of the bottom wall portion 10A of motor body 10 and stator blade 11A are preferably 3mm or larger to difference in size in height between the discharge-side edge portions 11c of 11E.
Now, with reference to Fig. 2, take stator blade 11A as example, the shape of how to confirm stator blade 11A to 11D below described.First, limit the first imaginary plane (virtual plane) PS1 extending diametrically, on it, comprise the inner and the centre line C L that extends through rotating shaft 8 centers of the discharge-side edge portions 11c of stator blade 11A.Then, limit the second imaginary plane PS2 extending diametrically, on it, comprise outer end and the centre line C L of the discharge-side edge portions 11c of stator blade 11A.And, limit the 3rd imaginary plane PS3 extending diametrically, on it, comprise outer end and the centre line C L of the lateral edge portions 11d that bleeds of stator blade 11A.Then, determine the shape of each stator blade 11, thus from the first imaginary plane PS1 to the second imaginary plane PS2 and from the both direction of the second imaginary plane PS2 to the three imaginary plane PS3 all towards the direction contrary with impeller 7 sense of rotation.
In this embodiment, arrange four stator blade 11A to 11D, make near the inclination angle [theta] 3 near the inclination angle [theta] 4 11a of outer end is greater than inner end 11b, and inclination angle gradually changes near inner end 11b from outer end 11a.That is, four stator blade 11A are shaped as to each of 11D: outer end 11a is fixed, and then, when observing outer end 11a from inner end 11b, inner end 11b is deasil reversed by the outer end 11a with respect to fixing.In other words, four stator blade 11A are shaped as to each of 11D: inner end 11b is fixed, and then, when observing inner end 11b from outer end 11a, outer end 11a is deasil reversed by the inner end 11b with respect to fixing.
Here, with reference to Figure 10, inclination angle is described.Figure 10 A is the partial view of the stator blade for describing inclination angle.Figure 10 B is cross-sectional view, and wherein stator blade 11D is cut near inner end 11b, and Figure 10 C is cross-sectional view, and wherein stator blade 11D is cut near the 11a of outer end.First, limit the imaginary plane PS4 extending along relief opening 16.Then, limit orthogonal imaginary plane PS5, PS6, it is orthogonal with imaginary plane PS4 respectively, and orthogonal with discharge-side edge portions 11c and the lateral edge portions 11d that bleeds respectively.Limit dummy line PL1 by the first intersection point CP1, orthogonal imaginary plane PS5 is crossing with discharge-side edge portions 11c here, and by the second intersection point CP2, orthogonal imaginary plane PS5 is crossing with the lateral edge portions 11d that bleeds here.Limit dummy line PL2 by another first intersection point CP11, orthogonal imaginary plane PS6 is crossing with discharge-side edge portions 11c here, and by another second intersection point CP12, orthogonal imaginary plane PS6 is crossing with the lateral edge portions 11d that bleeds here.Then, inclination angle is restricted to arbitrary the angle forming with imaginary plane PS4 by dummy line (PL1, PL2).
Figure 10 B represents inclination angle [theta] 3, when stator blade 11D records described inclination angle when orthogonal imaginary plane PS5 is cut near inner end 11b.Figure 10 C represents inclination angle [theta] 4, when stator blade 11D records described inclination angle when orthogonal imaginary plane PS6 is cut near inner end 11b.As mentioned above, in this embodiment, at four stator blade 11A, near the inclination angle [theta] 4 each the outer end 11a of 11D, be greater than near the inclination angle [theta] 3 inner end 11b, and inclination angle gradually changes near inner end 11b near the 11a of outer end.In this embodiment, the angle of inclination angle [theta] 3 is preferably in the scope of 45 ° to 55 °, and the angle of inclination angle [theta] 4 is in the scope of 50 ° to 60 °.
The flow velocity of the air of discharging from the relief opening 16 of axial flow fan 1 is apart from fan guard 3(outside) nearer region trends towards sooner, flow velocity is apart from motor body 10(inner side) nearer region trends towards slower.Here it is, and why stator blade 10A is to the 10D reason of shaping as mentioned above.When using the stator blade of simple shape more, this trend is identical.When stator blade 11A is set as mentioned above to 11D, at stator blade 11A to the flow velocity of the air of the inner end 11b Flow Structure Nearby of 11D with respect to being increased to the flow velocity of the air of the outer end 11a Flow Structure Nearby of 11D at stator blade 11A.Air velocity increases to inner end 11b gradually from the outer end 11a of stator blade.Based on foregoing, be understandable that, the flow velocity of the air of discharging from relief opening 16 homogenization as far as possible gradually, thus increase throughput and reduced noise level simultaneously.In this embodiment, rotation blade 5 has and is fixed to the inside edge of rotation blade fixed component 6 and more outer outer ledge diametrically.By the inside edge of rotation blade 5 with to be defined as the angle (inclination angle) that imaginary plane parallel with imaginary plane PS4 and that extend along the bottom wall surface of rotation blade fixed component 6 forms larger than the angle (inclination angle) being formed by the outer ledge of described imaginary plane and rotation blade 5.The difference at these inclination angles can suitably be determined by flow velocity as required.
Figure 11 A represents respectively structure and the inclination angle for the test axial flow fan of proving effect to 11C, wherein by stator blade is defined as and is greater than near the stator blade inclination angle [theta] 3 end therein near the inclination angle [theta] 4 its outer end, and from obtaining described structure and inclination angle towards changing inclination angle gradually near inner end near outer end.Different from the fan in above-described embodiment, in these test fans, all stator blades 11 possess identical shape, and a blade are not used as to the support device of lead-in wire.In order to verify the effect of reversing stator blade, be different from embodiment, the discharge-side edge portions 11c that stator blade 11 is set makes it concordant with the bottom wall portion 10C of motor body 10.Further, each of stator blade 11 is not formed with extension.In the fan shown in Figure 11 A, it is constant (57 °) that the inclination angle of stator blade is set to from inner end to outer end.In the fan shown in Figure 11 B, the same with embodiment's fan, inclination angle arranges littlely (47 °) in stator blade inner end one side, and inclination angle arranges to obtain large (57 °) in stator blade outer end one side, and inclination angle is set to become gradually large from the outside end of inner end.In the fan shown in Figure 11 C, inclination angle arranges to obtain large (57 °) in inner end one side of stator blade, and inclination angle arranges littlely (47 °) in outer end one side, and inclination angle is set to diminish gradually from the outside end of inner end.
Figure 12 is static pressure-Figure 11 A to the plotted curve of the measurement result of the airflow characteristic of three kinds of fans shown in 11C (wherein arrange identical, except the shape of stator blade and revolution remain unchanged).As shown in figure 12, among the feature B obtaining from fan (shown in Figure 11 B), wherein at Yi Ce inclination angle, outer end, be greater than the inclination angle in inner end one side, this is identical with the embodiment of the present invention, and its air-flow is greater than the air-flow feature A and the C obtaining from other two fans (shown in Figure 11 A and 11C) under identical static pressure.
When carry out shown in Figure 12 measurement time, noise is also simultaneously measured under identical condition.Form shown in Figure 13 has represented measurement result.Form has represented the sound pressure level difference with respect to the sound pressure level Na of noise, its by shown in Figure 11 A, with the driven fan of specific speed, produced (inclination angle of stator blade is constant).In fan (shown in Figure 11 B), wherein same as the previously described embodiments, Yi Ce inclination angle, outer end is set to than large at the inclination angle of inner end one side, and the sound pressure level of noise is lowered 1dB(A); And in fan (shown in Figure 11 C), wherein Yi Ce inclination angle in outer end is set to than little at the inclination angle of inner end one side, sound pressure level is increased 0.5dB(A).Measurement result shows, when identical with embodiments of the invention, while being set to be greater than the inclination angle of inner end one side at Yi Ce inclination angle, outer end, air-flow can increase and reduce noise level simultaneously.
Confirm, when the stator blade of shape shown in Figure 11 B is used as the stator blade of the axial flow fan disclosed in the applicant's earlier application (Japanese patent application No.2004-278370), air-flow is increased and noise level is lowered.Figure 14 shows static pressure-use the respectively plotted curve of Figure 11 A to the measurement result of the airflow characteristic of three fans of the stator blade shown in Figure 11 C.Form shown in Figure 15 has shown the variation of noise level, and its measurement is the same with the form shown in Figure 13.
In the above-described embodiments, stator blade blade 11E is configured to hold lead-in wire 25.When lead-in wire is simply pulled out and while not adopting arranging shown in this embodiment, the structure of stator blade 11E is identical to the structure of 11D with other stator blade 11A.All stator blade 11A are reversed as previously described to 11E.
Further, the invention is not restricted to these embodiments, can, in the situation that not departing from scope of the present invention, carry out various changes and change.
Claims (8)
1. an axial flow fan, comprising:
Fan guard, described fan guard comprises the air passageways with relief opening and bleeding point;
There are multiple blades and be arranged on the impeller in fan guard;
The rotor that impeller is fixed thereon, and described rotor encloses and pivots;
The stator that respective rotor arranges;
Motor body, described motor body comprises the peripheral wall part that is positioned at the bottom wall portion of relief opening one side and forms continuously and extend towards bleeding point with bottom wall portion, stator is fixed on bottom wall portion; And
Multiple stator blades, described multiple stator blades interval in the sense of rotation of rotor arranges and is positioned at the relief opening of air passageways, each connecting engine housing and fan guard of described multiple stator blades,
Each of described multiple stator blades have the inner wall section that is connected to fan guard outer end, be connected to the peripheral wall part of motor body inner end, be formed between outer end and inner end and be positioned at the discharge-side edge portions of relief opening one side, and be formed between outer end and inner end and be positioned at the lateral edge portions of bleeding of bleeding point one side
Each sense of rotation towards rotor in described multiple stator blade is bent in protruding mode,
Whole or most of stator blades in described multiple stator blade roughly tilt, and make the discharge-side edge portions of stator blade more forward in sense of rotation than the lateral edge portions of bleeding of described stator blade,
Wherein limit the imaginary plane extending along relief opening, limit the orthogonal imaginary plane orthogonal with described imaginary plane, orthogonal imaginary plane is crossing with discharge-side edge portions and the lateral edge portions of bleeding so that orthogonal imaginary plane and discharge-side edge portions and the lateral edge portions of bleeding are all orthogonal, limit dummy line by the first intersection point and the second intersection point, orthogonal at the first orthogonal imaginary plane in intersection point place and discharge-side edge portions, orthogonal with the lateral edge portions of bleeding at the second orthogonal imaginary plane in intersection point place
Discharge-side edge portions is extended and parallel with described imaginary plane along described imaginary plane,
Inclination angle is restricted to the angle being formed by described imaginary plane and dummy line; Wherein whole or most of described stator blades are greater than near whole or most of described stator blades inclination angle end therein near the inclination angle its outer end, and inclination angle near inner end towards becoming gradually large near outer end, thereby air velocity increases to inner end gradually from the outer end of stator blade.
2. axial flow fan according to claim 1, wherein, air passageways is that the shape of cross section intercepting in the direction of vertical line becomes large towards relief opening in the position existing from impeller in the region of relief opening position at axis.
3. axial flow fan according to claim 2, wherein, near inclination angle outer end is in the scope of 50 ° to 60 °, and near inclination angle inner end is in the scope of 45 ° to 55 °.
4. axial flow fan according to claim 1, wherein, a stator blade in described multiple stator blade has the many lead-in wires that are used to rotor that electric power is provided is contained in to structure wherein, and the stator blade except a described stator blade is the great majority of described multiple stator blades.
5. axial flow fan according to claim 1, wherein, the outer surface of the bottom wall portion of motor body is than the more close bleeding point of discharge-side edge portions of whole or most of described multiple stator blades.
6. axial flow fan according to claim 5, wherein, the outer surface of the bottom wall portion of motor body comprise planar base surface and with the continuous peripheral surface part of described planar base surface, and peripheral surface part from bottom surface, the peripheral surface of wall section is bending gradually to the periphery.
7. according to the axial flow fan described in claim 4 or 5, wherein, each all or in most of described multiple stator blades is included in the extension of extending on the bottom wall portion of motor body, and described extension has guiding surface, for guiding the portion of air that flows to bottom wall portion bottom surface along stator blade.
8. axial flow fan according to claim 7, wherein, described extension further has extension guiding surface, and described extension guiding surface and guiding surface form continuously and extend to sense of rotation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005-346880 | 2005-11-30 | ||
| JP2005346880A JP4664196B2 (en) | 2005-11-30 | 2005-11-30 | Axial blower |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101637116A Division CN1975180A (en) | 2005-11-30 | 2006-11-30 | Axial-flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103742429A true CN103742429A (en) | 2014-04-23 |
Family
ID=38087735
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310689782.XA Pending CN103742429A (en) | 2005-11-30 | 2006-11-30 | Axial blower |
| CNA2006101637116A Pending CN1975180A (en) | 2005-11-30 | 2006-11-30 | Axial-flow fan |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101637116A Pending CN1975180A (en) | 2005-11-30 | 2006-11-30 | Axial-flow fan |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US20070122271A1 (en) |
| JP (1) | JP4664196B2 (en) |
| CN (2) | CN103742429A (en) |
| TW (1) | TWI391564B (en) |
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| CN112128124A (en) * | 2020-09-28 | 2020-12-25 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Air-cooled heat dissipation axial flow cooling fan for electronic equipment |
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| CN106687698A (en) * | 2014-09-26 | 2017-05-17 | Ksb 股份公司 | Flow-conducting component |
| CN106687698B (en) * | 2014-09-26 | 2018-12-25 | Ksb 股份公司 | Guide the component of stream |
| CN112128124A (en) * | 2020-09-28 | 2020-12-25 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Air-cooled heat dissipation axial flow cooling fan for electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4664196B2 (en) | 2011-04-06 |
| TWI391564B (en) | 2013-04-01 |
| CN1975180A (en) | 2007-06-06 |
| TW200734548A (en) | 2007-09-16 |
| JP2007154671A (en) | 2007-06-21 |
| US20070122271A1 (en) | 2007-05-31 |
| US20140105763A1 (en) | 2014-04-17 |
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Application publication date: 20140423 |