CN102478020B - Centrifugal fan and fan blade thereof - Google Patents
Centrifugal fan and fan blade thereof Download PDFInfo
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- CN102478020B CN102478020B CN201010563587.9A CN201010563587A CN102478020B CN 102478020 B CN102478020 B CN 102478020B CN 201010563587 A CN201010563587 A CN 201010563587A CN 102478020 B CN102478020 B CN 102478020B
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Abstract
The invention discloses a fan blade of a centrifugal fan. The fan blade comprises a hub and multiple blades, wherein the hub is provided with a center point, the multiple blades are connected to the hub, and the most outer edges of the blades can approximately define a circle taking the center point as the centre; and each blade is provided with at least one groove, each groove is more than 0.5mm in depth and is provided with an obtuse angle less than 170 degrees, and the obtuse angle is an included angle of the inner side edge of each groove and the outer edge of each blade.
Description
Technical field
The present invention relates to a kind of fan assembly, and particularly relate to a kind of centrifugal fan.
Background technique
Centrifugal cutter is different from axial fan part and is, centrifugal cutter by the axial admission of flabellum, but is given vent to anger by the radial direction of flabellum.Please refer to Fig. 1, it illustrates a kind of top view of flabellum of existing centrifugal fan.The flabellum 100 of centrifugal fan comprises wheel hub 101 and multiple blade 102.Blade 102 is along the arrangement of wheel hub 101 product.
In order to increase centrifugal cutter performance (such as increasing air quantity), a kind of mode is wherein exactly the quantity increasing blade 102.When blade quantity is increased to too many, the density at internal diameter blade place can be caused to increase.For Fig. 1, when 23 blades 102 are connected to wheel hub 101, just cause the increase of blade 102 density near wheel hub 101.Because leaves density is too high, air flow spaces can be caused to reduce, therefore cause centrifugal cutter air output also can reduce.
Please refer to Fig. 2, it illustrates the sectional view of existing a kind of centrifugal fan.One of existing method improving the problems referred to above, reduce the axial height (blade in such as figure upper and lower between beveled edge 102a, 102b close to the distance of root of blade) of high leaves density exactly, reduce the resistance along axial (direction of arrow as in the figure) air inlet of blade 102, allow air be easy to flow to blade, and then increase giving vent to anger along blade 102 radial direction.
But, while minimizing blade 102 axial height, reduce the work area of blade 102 also, the air output of centrifugal fan is declined.How reducing the resistance of centrifugal fan air intake, increase blade working area again, fan duty is further improved, is facing a difficult choice that design meets with.
Summary of the invention
Therefore, an object of the present invention is the centrifugal fan providing a kind of improvement, for solving the problem mentioned by above-mentioned background technology.
According to above-mentioned the object of the invention, the present invention proposes a kind of flabellum of centrifugal fan, and it comprises a wheel hub and multiple blade.Wheel hub has a central point.Multiple blade is connected to wheel hub, and the outer most edge of those blades roughly to define with central point be the circular of the center of circle.Circle has Radius R, and each blade has at least one groove.Groove comprises the obtuse angle that the degree of depth and being greater than 0.5 millimeter is less than 170 degree, and this obtuse angle is the angle of the outer rim of groove inner side edge and blade.
According to one embodiment of the invention, groove is positioned at each blade lights calculation 0.6R scope from center.
According to another embodiment of the present invention, groove is positioned at each blade lights calculation 0.6R scope from center, and the quantity of groove has two at least, and groove is positioned at two opposed outer edge of each blade.
According to another embodiment of the present invention, groove to light scope between the 0.6R to 0.9R of calculation at each blade from center.
According to another embodiment of the present invention, groove to light scope between the 0.6R to 0.9R of calculation at each blade from center, and the quantity of groove has two at least, and groove is positioned at two relative outer rims of each this blade.
According to above-mentioned the object of the invention, the present invention also proposes a kind of flabellum of centrifugal fan, and it comprises a wheel hub, a connecting ring and multiple blade.Wheel hub has a central point.Connecting ring is located at around wheel hub.Multiple blade is connected to connecting ring, and the circle that it is the center of circle that the outer most edge of those blades roughly defines with this central point, circle has Radius R.At least one first groove is defined between each blade and wheel hub.First groove comprises the degree of depth and being greater than 0.5 millimeter and is less than 170 degree, the angle of the outer rim of this obtuse angle groove inner side edge and blade.
According to one embodiment of the invention, the inner edge of connecting ring and the outer rim of wheel hub are seamless connectivities.
According to another embodiment of the present invention, the inner edge of connecting ring and the outer rim of wheel hub have recessed bond ing.
According to another embodiment of the present invention, the first groove is positioned at each blade lights calculation 0.6R scope from center.
According to another embodiment of the present invention, the quantity of the first groove has two at least, and the first groove is positioned at the two opposite sides of connecting ring.
According to another embodiment of the present invention, each blade also comprises at least one second groove scope between the 0.6R to 0.9R started at from this central point.
According to another embodiment of the present invention, the quantity of the second groove has two at least, and the second groove is positioned at two relative outer rims of each blade.
According to above-mentioned the object of the invention, the present invention also proposes a kind of centrifugal fan, and it comprises a flabellum, a motor and a housing.Motor is connected to wheel hub and drives flabellum to rotate.The coated flabellum of housing and motor, housing has the axis that at least one wind inlet is positioned at flabellum, and has the radial direction that at least one wind inlet is positioned at flabellum.Flabellum comprises a wheel hub and multiple blade.Wheel hub has a central point.Multiple blade is connected to wheel hub, and the outer most edge of those blades roughly to define with central point be the circular of the center of circle.Circle has Radius R, and each blade has at least one groove.Groove comprises the obtuse angle that the degree of depth and being greater than 0.5 millimeter is less than 170 degree, and this obtuse angle is the angle of the outer rim of groove inner side edge and blade.
According to one embodiment of the invention, groove is positioned at each blade lights calculation 0.6R scope from center.
According to one embodiment of the invention, groove to light scope between the 0.6R to 0.9R of calculation at each blade from center.
According to above-mentioned the object of the invention, propose a kind of centrifugal fan, it comprises a flabellum, a motor and a housing.Motor is connected to wheel hub and drives flabellum to rotate.The coated flabellum of housing and motor, housing has the axis that at least one wind inlet is positioned at flabellum, and has the radial direction that at least one wind inlet is positioned at flabellum.Flabellum comprises a wheel hub, a connecting ring and multiple blade.Wheel hub has a central point.Connecting ring is located at around wheel hub.Multiple blade is connected to connecting ring, and the circle that it is the center of circle that the outer most edge of those blades roughly defines with this central point.At least one first groove is defined between each blade and wheel hub.First groove comprises the degree of depth and being greater than 0.5 millimeter and is less than 170 degree, the angle of the outer rim of this obtuse angle groove inner side edge and blade.
According to one embodiment of the invention, the inner edge of connecting ring and the outer rim of wheel hub are seamless connectivities, and the first groove is positioned at each blade lights calculation 0.6R scope from center.
According to another embodiment of the present invention, the inner edge of connecting ring and the outer rim of wheel hub are seamless connectivities, and each blade also comprises at least one second groove, scope between the 0.6R to 0.9R started at from this central point.
According to another embodiment of the present invention, the inner edge of connecting ring and the outer rim of wheel hub have recessed bond ing, and the first groove is positioned at each blade lights calculation 0.6R scope from center.
According to another embodiment of the present invention, the inner edge of connecting ring and the outer rim of wheel hub have recessed bond ing, and each blade also comprises at least one second groove, scope between the 0.6R to 0.9R lighting calculation from center.
From the above, apply the groove design of centrifugal fan of the present invention and flabellum thereof, effectively can promote the usefulness of centrifugal fan, remove from reducing and cut down larger blade working area, make centrifugal fan usefulness effectively promote on the contrary.
Accompanying drawing explanation
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended the description of the drawings is as follows:
Fig. 1 is the top view of the flabellum of existing a kind of centrifugal fan;
Fig. 2 is the sectional view of existing a kind of centrifugal fan;
Fig. 3 is the exploded view of a kind of centrifugal fan of the first embodiment of the present invention;
Fig. 4 is the sectional view of a kind of centrifugal fan of the second embodiment of the present invention;
Fig. 5 is the sectional view of a kind of centrifugal fan of the third embodiment of the present invention;
Fig. 6 is the sectional view of a kind of centrifugal fan of the fourth embodiment of the present invention;
Fig. 7 is the sectional view of a kind of centrifugal fan of the fifth embodiment of the present invention;
Fig. 8 is the sectional view of a kind of centrifugal fan of the sixth embodiment of the present invention;
Fig. 9 is the sectional view of a kind of centrifugal fan of the seventh embodiment of the present invention;
Figure 10 is the top view of a kind of centrifugal fan of the eighth embodiment of the present invention;
Figure 11 is the sectional view of the hatching 11-11 ' along Figure 10;
Figure 12 is the top view of a kind of centrifugal fan of ninth embodiment of the invention; And
Figure 13 is the top view of the hatching 13-13 ' along Figure 12.
Primary clustering symbol description
100 flabellum 203 grooves
101 wheel hub 203a grooves
102 blade 203b grooves
102a beveled edge 203c groove
102b beveled edge 203d groove
110 housing 203g grooves
200 centrifugal fan 203g ' grooves
202 flabellum 203h grooves
202 ' flabellum 203i groove
202 " flabellum 205 motor
202c central point 205a rotating shaft
202a wheel hub 210a upper shell
202b blade 210b lower shell body
202c central point 210c wind inlet
202d connecting ring 210d wind inlet
202e rib 210e rib
R radius 210f base plate
C
1degree of depth 210g exhaust outlet
C
2the degree of depth
D
1distance
D
2distance
A
1~ A
7angle
Embodiment
As mentioned above, the invention provides a dynamical centrifugal fan, by designing groove on the blade of fan, and then increasing the efficiency of centrifugal fan air inlet.Embodiment's details of this case is described by accompanying drawing below.
Please refer to Fig. 3, it illustrates the exploded view of a kind of centrifugal fan of first embodiment of the invention.Centrifugal fan 200 comprises upper shell 210a, lower shell body 210b, flabellum 202 and a motor 205.After upper shell 210a and lower shell body 210b combines, flabellum 202 and motor 205 can be coated on the housing interior (combination of upper shell 210a and lower shell body 210b) of combination.The bottom surface of motor 205 is fixed on the base plate 210f of lower shell body 210b.The rotating shaft 205a of motor 205 is connected to the wheel hub 202a of flabellum 202, rotates for driving flabellum 202.Upper shell 210a has a wind inlet 210c, and lower shell body 210b has multiple wind inlet 210d, and wind inlet 210c, 210d are all positioned at the axis of flabellum 202.Wind inlet 210d is between many roots bar 210e, and rib 210e is in order to connecting bottom board 210f and lower shell body 210b.When flabellum 202 rotates, band moving air flow is flowed into by wind inlet 210c, 210d, and is flowed out by exhaust outlet 210g.Exhaust outlet 210g is positioned at the radial direction of flabellum 202.Flabellum 202 comprises wheel hub 202a and multiple blade 202b.Blade 202b is connected on wheel hub 202a, and each blade 202b has at least one groove 203, for increasing the intake efficiency of air-flow.
In other embodiments, wind inlet only designs on upper shell 210a or lower shell body 210b, and in other words, centrifugal fan 200 can only from the wherein side air inlet of flabellum 202.
Please refer to Fig. 4, it illustrates the sectional view of a kind of centrifugal fan of second embodiment of the invention.Centrifugal fan comprises a housing 210, motor 205, wheel hub 202a and multiple blade 202b.The circle (the multiple blade 202b referring to Fig. 3) that it is the center of circle that multiple blade 202b outer most edge roughly defines with central point 202c, and circle has Radius R.Each blade 202b has a groove 203a, and it is positioned at the distance D that each blade 202b starts at from central point 202c
1in scope.Experimental result, distance D
1be approximately 0.6R, groove 203a more effectively can promote the usefulness of centrifugal fan.In addition, the degree of depth C of groove 203a
1also must be greater than 0.5 millimeter, and the included angle A of the outer rim of groove 203a inner side edge and blade 202b
1must for the obtuse angle being less than 170 degree, the usefulness of centrifugal fan just can promote, otherwise the groove of blade only can reduce work area, lowers the usefulness of centrifugal fan on the contrary.
Please refer to Fig. 5, it illustrates the sectional view of a kind of centrifugal fan of third embodiment of the invention.The difference of this embodiment and the second embodiment is the position of groove.In the third embodiment, groove 203b distance wheel hub 202a (comparing with groove 203a) comparatively far away.Groove 203b is positioned at the distance D that each blade 202b starts at from central point 202c
2in scope.Experimental result, distance D
2be approximately 0.9R, groove 203b more effectively can promote the usefulness of centrifugal fan.In addition, the degree of depth C of groove 203b
2also must be greater than 0.5 millimeter, and the included angle A of the outer rim of groove 203b inner side edge and blade 202b
2, A
3must for the obtuse angle being less than 170 degree, the usefulness of centrifugal fan just can promote, otherwise the groove of blade only can reduce work area, lowers the usefulness of centrifugal fan on the contrary.
Please refer to Fig. 6, it illustrates the sectional view of a kind of centrifugal fan of fourth embodiment of the invention.The difference of this embodiment and second and third embodiment is, each blade has two grooves.When each blade 202b has groove 203a, 203b, groove 203a is positioned at the distance D that each blade 202b starts at from central point 202c
1in scope, and groove 203b is positioned at the distance D that each blade 202b starts at from central point 202c
1to distance D
2between scope in, groove 203a, 203b more effectively can promote the usefulness of centrifugal fan.
Please refer to Fig. 7, it illustrates the sectional view of a kind of centrifugal fan of the fifth embodiment of the present invention.The difference of this embodiment and the 4th embodiment is, the distance D that each blade 202b starts at from central point 202c
1to distance D
2between scope in there are two grooves.Groove 203c, 203d are positioned at the distance D that each blade 202b starts at from central point 202c
1to distance D
2between scope in, and to have and above-mentioned groove identical characteristics (such as " degree of depth is greater than 0.5 millimeter " and " angle of the outer rim of groove inner side edge and blade is be less than the obtuse angle of 170 degree ").
Please refer to Fig. 8, it illustrates the sectional view of a kind of centrifugal fan of sixth embodiment of the invention.The difference of this embodiment and the 5th embodiment is, the distance D that each blade 202b starts at from central point 202c
1to distance D
2between scope in there is comparatively wide groove.The width of groove 203i is slightly less than distance D
1to distance D
2between scope.The degree of depth of groove 203i still needs to be greater than 0.5 millimeter, and the included angle A of the outer rim of groove 203i inner side edge and blade 202b
4, A
5must for the obtuse angle being less than 170 degree.
Please refer to Fig. 9, it illustrates the sectional view of a kind of centrifugal fan of seventh embodiment of the invention.The difference of this embodiment and the 6th embodiment is, two opposed outer edge of each blade 202b all have groove.In the 7th embodiment, each blade 202b has the upper limb that groove 203a, 203b are positioned at blade, and has the lower edge that groove 203e, 203f are positioned at blade.Groove 203a, 203e can be positioned at the distance D that each blade 202b starts at from central point 202c
1in scope.Groove 203b, 203f are positioned at the distance D started at from central point 202c from each blade 202b
1to distance D
2between scope in.In another embodiment, each blade 202b also only can have the upper limb that groove 203a is positioned at blade, and has the lower edge that groove 203e is positioned at blade, and groove 203a, 203e are all positioned at the distance D that each blade 202b starts at from central point 202c
1in scope.In another embodiment, each blade 202b also only can have the upper limb that groove 203b is positioned at blade, and has the lower edge that groove 203f is positioned at blade, and groove 203b, 203f are all positioned at the distance D started at from central point 202c from each blade 202b
1to distance D
2between scope in.
Please refer to Figure 10, its illustrate a kind of centrifugal fan of eighth embodiment of the invention top view.Figure 11 is the sectional view of the hatching 11-11 ' illustrated along Figure 10.This embodiment is the different of blade structure from the Main Differences of above-described embodiment.In the 8th embodiment, flabellum 202 ' comprises a wheel hub 202a, multiple blade 202b and a connecting ring 202d.Connecting ring 202d is arranged at around wheel hub 202a, for multiple blade 202b connection.Connecting ring 202d can discongest the too high problem of wheel hub 202a surrounding vanes density, makes the efficiency of air inlet better.At least one groove is defined between each blade 202b and wheel hub 202a.Groove only can be formed at the upside (such as groove 203g) of connecting ring 202d; Groove only can be formed at the downside (such as groove 203g ') of connecting ring 202d; Or groove is formed at the relative upper and lower side of connecting ring 202d two simultaneously.Groove 203g, 203g ' be all positioned at the distance D that each blade 202b starts at from central point 202c
1in scope.Groove 203g, 203g ' the degree of depth still need to be greater than 0.5 millimeter, and groove 203g, 203g ' angle (the such as A of outer rim of inner side edge and blade 202b
6) must for the obtuse angle being less than 170 degree.
In other is implemented, groove 203a, 203b, 203c, 203d, 203e, 203f or 203i of the second ~ seven embodiment also can design on the flabellum 202b of the 8th embodiment.
Please refer to Figure 12, it illustrates the top view of a kind of centrifugal fan of ninth embodiment of the invention.Figure 13 is the sectional view of the hatching 13-13 ' illustrated along Figure 12.This embodiment and the Main Differences of the 8th embodiment are the different of Placement between connecting ring and wheel hub.In the 8th embodiment, the inner edge of connecting ring 202d and the outer rim of wheel hub 202a are seamless connectivities.In the 9th embodiment, the inner edge of connecting ring 202d and the outer rim of wheel hub 202a have recessed bond ing, and the multiple rib 202e of connecting ring 202d mat is connected to wheel hub 202a.Flabellum 202 " comprise a wheel hub 202a, multiple blade 202b, rib 202e and a connecting ring 202d.Connecting ring 202d is arranged at around wheel hub 202a, for multiple blade 202b connection.Connecting ring 202d can alleviate the too high problem of wheel hub 202a surrounding vanes density, makes the efficiency of air inlet better.A groove 203h is defined between each blade 202b and wheel hub 202a.Groove 203h is positioned at the distance D that each blade 202b starts at from central point 202c
1in scope.The included angle A 7 of the outer rim of groove 203h inner side edge and blade 202b must for the obtuse angle being less than 170 degree.
In other is implemented, groove 203a, 203b, 203c, 203d, 203e, 203f or 203i of the second ~ seven embodiment also can design on the flabellum 202b of the 9th embodiment.
From the invention described above mode of execution, apply the groove design of centrifugal fan of the present invention and flabellum thereof, fan duty can be made further to improve, remove from reducing and cut down larger blade working area, make centrifugal fan usefulness effectively promote on the contrary.
Although disclose the present invention in conjunction with above mode of execution; but itself and be not used to limit the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, what therefore protection scope of the present invention should define with the claim of enclosing is as the criterion.
Claims (18)
1. a flabellum for centrifugal fan, at least comprises:
Wheel hub, has a central point; And
Multiple blade, is connected to this wheel hub, and the circle that it is the center of circle that the outer most edge of those blades roughly defines with this central point, this circle has Radius R, and each this blade has at least one first groove, and this first groove at least comprises:
One degree of depth being greater than 0.5 millimeter; And
One obtuse angle being less than 170 degree is the angle of the outer rim of this first groove inner side edge and this blade;
Each this blade also comprises at least one second groove, scope between the 0.6R to 0.9R that this second groove is started at from this central point at each this blade.
2. flabellum as claimed in claim 1, wherein this first groove is positioned at the 0.6R scope that each this blade is started at from this central point.
3. flabellum as claimed in claim 1, wherein this first groove is positioned at the 0.6R scope that each this blade is started at from this central point, and the quantity of this first groove has two at least, and this first groove is positioned at two opposed outer edge of each this blade.
4. flabellum as claimed in claim 1, wherein the quantity of this second groove has two at least, and this second groove is positioned at two relative outer rims of each this blade.
5. a flabellum for centrifugal fan, at least comprises:
Wheel hub, has a central point;
Connecting ring, is located at around this wheel hub; And
Multiple blade, be connected to this connecting ring, and the circle that it is the center of circle that the outer most edge of those blades roughly defines with this central point, this circle has Radius R, at least one first groove is defined between each this blade and this wheel hub, each this blade also comprises at least one second groove, scope between the 0.6R to 0.9R that this second groove is started at from this central point at each this blade, and this first groove at least comprises:
One degree of depth being greater than 0.5 millimeter; And
One obtuse angle being less than 170 degree is the angle of the outer rim of this first groove inner side edge and this blade.
6. flabellum as claimed in claim 5, wherein the inner edge of this connecting ring and the outer rim of this wheel hub are seamless connectivities.
7. flabellum as claimed in claim 6, wherein this first groove is positioned at the 0.6R scope that each this blade is started at from this central point.
8. flabellum as claimed in claim 7, wherein this first groove has two, and this first groove is positioned at the two opposite sides of this connecting ring.
9. flabellum as claimed in claim 5, wherein the quantity of this second groove has two at least, and this at least two second groove is positioned at two relative outer rims of each this blade.
10. flabellum as claimed in claim 5, wherein the inner edge of this connecting ring and the outer rim of this wheel hub have recessed bond ing.
11. flabellums as claimed in claim 10, wherein this first groove is positioned at the 0.6R scope that each this blade is started at from this central point.
12. flabellums as claimed in claim 11, wherein the quantity of this second groove has two at least, and this at least two second groove is positioned at two relative outer rims of each this blade.
13. 1 kinds of centrifugal fans, at least comprise:
Flabellum, comprises:
Wheel hub, has a central point; And
Multiple blade, is connected to this wheel hub, and the circle that it is the center of circle that the outer most edge of those blades roughly defines with this central point, this circle has Radius R, and each this blade has at least one first groove, and this first groove at least comprises:
Be greater than the degree of depth of 0.5 millimeter; And
Being less than the obtuse angle of 170 degree, is the angle of the outer rim of this first groove inner side edge and this blade;
Wherein this first groove is positioned at the 0.6R scope that each this blade is started at from this central point, and the quantity of this first groove has two at least, and this first groove is positioned at two opposed outer edge of each this blade;
Each this blade also comprises at least one second groove, scope between the 0.6R to 0.9R that this second groove is started at from this central point at each this blade;
Motor, is connected to this wheel hub and drives this flabellum to rotate; And
Housing, this flabellum coated and this motor, this housing has the axis that at least one wind inlet is positioned at this flabellum, and has the radial direction that at least one exhaust outlet is positioned at this flabellum.
14. centrifugal fans as claimed in claim 13, wherein this first groove is positioned at the 0.6R scope that each this blade is started at from this central point.
15. centrifugal fans as claimed in claim 13, wherein the quantity of this second groove has two at least, and this at least two second groove is positioned at two relative outer rims of each this blade.
16. 1 kinds of centrifugal fans, at least comprise:
Flabellum, comprises:
Wheel hub, has a central point;
Connecting ring, is located at around this wheel hub; And
Multiple blade, is connected to this connecting ring, and the circle that it is the center of circle that the outer most edge of those blades roughly defines with this central point, this circle has Radius R, defines at least one first groove between each this blade and this wheel hub, and this first groove at least comprises:
One degree of depth being greater than 0.5 millimeter; And
One obtuse angle being less than 170 degree is the angle of the outer rim of this first groove inner side edge and this blade;
Each this blade also comprises at least one second groove, scope between the 0.6R to 0.9R that this second groove is started at from this central point at each this blade;
Motor, is connected to this wheel hub and drives this flabellum to rotate; And
Housing, this flabellum coated and this motor, this housing has the axis that at least one wind inlet is positioned at this flabellum, and has the radial direction that at least one exhaust outlet is positioned at this flabellum.
17. centrifugal fans as claimed in claim 16, wherein the inner edge of this connecting ring and the outer rim of this wheel hub are seamless connectivities, and this first groove is positioned at the 0.6R scope that each this blade is started at from this central point.
18. centrifugal fans as claimed in claim 16, wherein the inner edge of this connecting ring and the outer rim of this wheel hub have recessed bond ing, and this first groove is positioned at the 0.6R scope that each this blade is started at from this central point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010563587.9A CN102478020B (en) | 2010-11-24 | 2010-11-24 | Centrifugal fan and fan blade thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010563587.9A CN102478020B (en) | 2010-11-24 | 2010-11-24 | Centrifugal fan and fan blade thereof |
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| CN102478020A CN102478020A (en) | 2012-05-30 |
| CN102478020B true CN102478020B (en) | 2015-06-03 |
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| CN106640321A (en) * | 2016-12-09 | 2017-05-10 | 重庆道同动力机械设备有限公司 | Heat exchange wind wheel structure of engine |
| WO2019148468A1 (en) * | 2018-02-02 | 2019-08-08 | 华为技术有限公司 | Fan and mobile terminal |
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| JP5005181B2 (en) * | 2005-04-01 | 2012-08-22 | 日本電産サーボ株式会社 | Centrifugal fan |
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| JP3855533B2 (en) * | 1999-05-17 | 2006-12-13 | 松下電器産業株式会社 | Mixed flow fan |
| CN2527760Y (en) * | 2001-11-20 | 2002-12-25 | 元力电机股份有限公司 | Centrifugal heat radiation fan |
| CN2755321Y (en) * | 2004-11-22 | 2006-02-01 | 广达电脑股份有限公司 | Centrifugal fan |
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| Publication number | Publication date |
|---|---|
| CN102478020A (en) | 2012-05-30 |
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