CN103104555A

CN103104555A - Centrifugal fan

Info

Publication number: CN103104555A
Application number: CN2011103519702A
Authority: CN
Inventors: 林星晨; 黄祥荣
Original assignee: Delta Optoelectronics Inc
Current assignee: Delta Optoelectronics Inc
Priority date: 2011-11-09
Filing date: 2011-11-09
Publication date: 2013-05-15
Anticipated expiration: 2031-11-09
Also published as: CN103104555B

Abstract

A centrifugal fan comprises an impeller and a shell body. The impeller comprises a shaft core and a fan blade, and the impeller is covered by the shell body. The shell body comprises an upper shell body, a lower shell body, at least one convex portion and a first air inlet, wherein the convex portion is arranged above at least one of the upper shell body and the lower shell body and positioned around the fan blade, the first air inlet is arranged on the upper shell body, the first air inlet comprises a first area and a second area, and the diameter of the first area is larger than that of the second area. The centrifugal fan can reduce pressure leakage caused by air backflow, can increase air inlet amount by adjusting the size of the air inlet and can achieve the best heat radiation effects.

Description

Centrifugal fan

Technical field

The present invention relates to a kind of fan, particularly a kind of centrifugal fan.

Background technique

Along with electronic industry develops rapidly, the heat that the heat-generating electronic elements such as chip in electronic product produce is more and more.For described waste heat is effectively distributed, usually a radiator is sticked on the surface of heat-generating electronic elements, then one centrifugal fan is set on radiator, and the cooling blast that utilizes centrifugal cutter to produce carries out forced heat radiation to radiator, thereby the heat that heat-generating electronic elements is produced leaves.

Please refer to shown in Figure 1A and Figure 1B, wherein Figure 1A is the plan view of the centrifugal fan of prior art, and Figure 1B is the sectional drawing of the centrifugal fan of Figure 1A.Centrifugal fan 1 comprises an impeller 11 and a housing 12.Impeller 11 is arranged in housing 12, and impeller 11 is connected with housing 12 by an axle center 111, and a flabellum 112 is located on axle center 111.Housing 12 has a upper casing 121 and a lower casing 122, and upper casing 121 is connected with lower casing 122, and impeller 11 is arranged between upper casing 121 and lower casing 122.

Lower casing 121 on existing centrifugal cutter, 122 surface are a planar design, and can be gapped between flabellum 112 and upper lower casing 121,122, therefore when the hydrodynamic pressure in fan increases to pressure greater than the outside, fluid can through this gap up the wind inlet of lower casing 121,122 inside overflow (as shown by arrows), reduce so that enter air quantity, also cause air output to descend, and then the whole heat dissipation of impact.

Therefore, how to provide a kind of centrifugal fan, can avoid gas backstreaming and reduce into air quantity, more effectively pilot gas flows to exhaust outlet, air output is increased, with the usefulness of effective heat radiation.

Summary of the invention

Because above-mentioned problem, purpose of the present invention is for providing a kind of centrifugal fan, and the phenomenon that can reduce the air return leak pressure produces, and can be by the size of adjusting wind inlet being added to air quantity, and then obtains best heat radiation function.

In order to achieve the above object, the invention provides a kind of centrifugal fan and comprise an impeller and a housing.Impeller has an axle center and a flabellum.Housing coats impeller, housing has a upper casing, a lower casing, at least one protuberance and one first wind inlet, wherein, protuberance be arranged at upper casing and lower casing at least one of them, and be arranged at flabellum around, the first wind inlet is arranged at upper casing, and the first wind inlet has a first area and a second area, and the radius of first area is greater than the radius of second area.

In a preferred embodiment of the present invention, housing has more an exhaust outlet, is arranged between upper casing and lower casing.

In a preferred embodiment of the present invention, take in the axle center as the center of circle, the angle of first area is less than 270 degree.

In a preferred embodiment of the present invention, protuberance is ring-type or circular-arc.

In a preferred embodiment of the present invention, lower casing has a throat.

In a preferred embodiment of the present invention, protuberance is arranged at a side of upper casing or the close exhaust outlet of lower casing, and protuberance also can be arranged at upper casing or lower casing away from a side of exhaust outlet.

In a preferred embodiment of the present invention, when housing has a plurality of protuberance, described a plurality of protuberances be arranged at respectively upper casing and lower casing at least one of them.

From the above, centrifugal fan of the present invention is by one of them is provided with protuberance at least in upper casing and lower casing, and is arranged at the outside of flabellum, makes from wind inlet and sends the wind that comes to, can avoid being back to the external world because of the air pressure in housing.In addition, a plurality of or difform protuberance can be set in housing, being applied to varying environment, or the centrifugal fan of corresponding different size is used.Moreover centrifugal fan of the present invention is provided with first area and second area with wind inlet, by the opening of first area and second area is adjusted not formed objects, is adjusted the air quantity that enters of centrifugal fan.

Description of drawings

Figure 1A is the plan view of existing centrifugal fan;

Figure 1B is the sectional drawing according to the centrifugal fan of Figure 1A;

Fig. 2 A is the decomposing schematic representation according to the centrifugal fan of preferred embodiment of the present invention;

Fig. 2 B is the combination schematic diagram according to the centrifugal fan of Fig. 2 A;

Fig. 2 C is the plan view according to the centrifugal fan of Fig. 2 B;

Fig. 2 D is the sectional drawing according to the centrifugal fan of Fig. 2 C;

Fig. 3 A and Fig. 3 B are the variation aspect schematic diagram of housing of the present invention;

Fig. 4 A to Fig. 4 C is the variation aspect schematic diagram of housing of the present invention; And

Fig. 5 is the variation aspect schematic diagram according to centrifugal fan of the present invention.

Wherein, description of reference numerals is as follows:

1,2,2a, 2b, 2c, 2d, 2e, 2f: centrifugal fan

11,3: impeller

111,31: the axle center

112,32: flabellum

12,4,4a, 4b, 4c, 4d, 4e, 4f: housing

121,41: upper casing

122,42: lower casing

421: throat

43,43a: protuberance

44: the first wind inlets

441: the first area

442: second area

45: the second wind inlets

46: exhaust outlet

A: gap

B: highly

L: reference line

θ: angle

Embodiment

Hereinafter with reference to correlative type, a kind of centrifugal fan according to preferred embodiment of the present invention is described, wherein identical element will be illustrated with identical reference marks.

Please refer to shown in Fig. 2 A to Fig. 2 B, wherein Fig. 2 A is the decomposing schematic representation according to a kind of centrifugal fan of preferred embodiment of the present invention; Fig. 2 B is the combination schematic diagram according to the centrifugal fan of Fig. 2 A.Centrifugal fan 2 comprises an impeller 3 and a housing 4.

Impeller 3 has an axle center 31 and a flabellum 32.Flabellum 32 is located on axle center 31.Impeller 3 is connected with housing 4 with axle center 31.

Housing 4 coats impeller 3, and housing 4 has a upper casing 41, a lower casing 42, at least one protuberance 43 and one first wind inlet 44.Upper casing 41 is oppositely arranged with lower casing 42, and interconnects, and in the present embodiment, impeller 3 31 is connected with the lower casing 42 of housing 4 by the axle center.

Please be simultaneously with reference to shown in Fig. 2 A to Fig. 2 D, wherein Fig. 2 C is the plan view according to the centrifugal fan of Fig. 2 B; Fig. 2 D is the sectional drawing according to the centrifugal fan of Fig. 2 C.Protuberance 43 is arranged at one of them of upper casing 41 and lower casing 42, and be arranged at flabellum 32 around, wherein, protuberance 43 can be integrated element with upper casing 41 or lower casing 42, also can be respectively independent component, protuberance 43 is arranged at upper casing 41 or lower casing 42, so non-limiting the use of in the present invention.When housing 4 had a plurality of protuberance 43, described a plurality of protuberances 43 can be arranged at respectively upper casing 41 and lower casing 42, or described a plurality of protuberance 43 all is arranged at upper casing 41 and lower casing 42 one of them.In addition, the shape of protuberance 43 can be ring-type, circular-arc, straight line shape or other aspects.The protuberance 43 that the centrifugal fan 2 of the present embodiment has two ring-types take housing 4 is as example, and described a plurality of protuberance 43 is arranged at respectively upper casing 41 and lower casing 42, and is so non-in order to limit the present invention.

Please refer to shown in Fig. 3 A and Fig. 3 B, it is the variation aspect schematic diagram of housing of the present invention.The housing 4a of centrifugal fan 2a is take protuberance 43 with a ring-type as example, and protuberance 43 is arranged at lower casing 42.The housing of centrifugal fan 2b also has the protuberance 43 of a ring-type, yet its protuberance 43 is arranged at upper casing 41.

Refer again to shown in Fig. 2 D, it is worth mentioning that, has a gap A between flabellum 32 and upper casing 41 or lower casing 42, and protuberance 43 has a height B, the height B of protuberance 43 is greater than 1/4th gap A, for example, if gap A is 0.4 centimeter, the height B of protuberance 43 should be greater than 0.1 centimeter, to avoid being back to the external world because air pressure inside is excessive from the air fluid that the first wind inlet 44 flows in housing 4.

Refer again to shown in Fig. 2 A to Fig. 2 C, the first wind inlet 44 is arranged at upper casing 41.First wind inlet 44 of the present embodiment has a first area 441 and a second area 442, and the radius of first area 441 is greater than the radius of second area 442.In more detail, the centrifugal fan 2 of the present embodiment can be considered as the center of circle with axle center 31, the first wind inlet 44 can be seen a circle as, yet it is not exclusively round, wherein, the opening of first area 441 stretches out, and makes the radius of the radius of first area 441 and second area 442 unequal, and 441 radius is example greater than the radius of second area 442 to the present embodiment take the first area.

In addition, housing 4 has more one second wind inlet 45, is arranged at lower casing 42, is oppositely arranged with the first wind inlet 44, and shape and the size of the shape of second wind inlet 45 of the present embodiment and size and the first wind inlet 44 are unequal.

Housing 4 has more an exhaust outlet 46, is arranged between this upper casing 41 and lower casing 42.Exhaust outlet 46 and the first wind inlet 44 and the vertical setting of the second wind inlet 45 are in order to discharging the gas in centrifugal fan 2, with to an electronic product radiating.

Lower casing 42 has a throat 421, and in more detail, throat 421 is arranged at a side of the close exhaust outlet 46 of lower casing 42, and also near flabellum 32, makes the gas in housing 4 to discharge to exhaust outlet 46 with counterclockwise (shown in the drawing of Fig. 2 A).

The angle that the angle that only is noted that the first area 441 of the first wind inlet 44 adds second area 442 is 360 degree, and wherein, the angle θ of first area 441 is less than 270 degree.In more detail, as shown in Fig. 2 C, 31 are the center of circle take the axle center, 31 are reference line L to throat 421 take the axle center, in the scope of first area 441 is spent to exhaust outlet 46 directions (as shown by arrows) rotation 270 from reference line L, that is first area 441 is arranged in 270 degree that rotate clockwise from reference line L for better, whereby to increase the air quantity that enters near exhaust outlet 46 sides.The present embodiment is by being divided into a plurality of zones with the first wind inlet 44, and the openings of sizes in described a plurality of zones is unequal, to be added to air quantity.In other embodiments, the first wind inlet 44 more can have the 3rd zone or the 4th zone, with the size of increase and decrease wind inlet, also can be different according to setting position, and adjust air quantity.

Please refer to shown in Fig. 4 A to Fig. 4 C, it is the variation aspect schematic diagram of housing of the present invention.Mentioned in above-mentioned, the shape of protuberance can be ring-type, circular-arc, straight line shape or other aspects, and protuberance can be arranged at the outside of part flabellum.As shown in Fig. 4 A, the shape of the protuberance 43a of centrifugal fan 2c is take circular-arc as example, and be arranged at housing 4c near a side of exhaust outlet 46, protuberance 43a can be set respectively in upper casing 41 and lower casing 42, also a protuberance 43a can be arranged at upper casing 41 or lower casing 42 one of them.As shown in Figure 4 B, the protuberance 43a of centrifugal fan 2d also can be arranged at housing 4d away from a side of exhaust outlet 46.As shown in Fig. 4 C, centrifugal fan 2e of the present invention also can arrange a plurality of protuberance 43a in housing 4e, described a plurality of protuberance 43a can all be arranged at upper casing 41 or lower casing 42 one of them, also can be arranged at respectively upper casing 41 and lower casing 42.

With reference to shown in Figure 5, it is the variation aspect schematic diagram of centrifugal fan of the present invention.Centrifugal fan 2f arranges two exhaust outlets 46 in housing 4f, and is arranged at respectively the both sides of housing 4f, and the housing 4f of the present embodiment is provided with protuberance 43 in upper casing 41 and lower casing 42.The centrifugal fan 2f of the present embodiment not only can avoid airflow reflux, is added to air quantity, more can be simultaneously to the both direction air-supply, to increase the effect of heat radiation.Angle θ that it should be noted that the first area 441 of the present embodiment also spends less than 270.

In sum, centrifugal fan of the present invention is by one of them is provided with protuberance at least in upper casing and lower casing, and is arranged at the outside of flabellum, makes from wind inlet and sends the wind that comes to, can avoid being back to the external world because of the effects of air pressure in housing.In addition, a plurality of or difform protuberance can be set in housing, being applied to varying environment, or the centrifugal fan of corresponding different size is used.Moreover centrifugal fan of the present invention is provided with first area and second area with wind inlet, by the opening of first area and second area is adjusted not same size, is adjusted the air quantity that enters of centrifugal fan.

Compared with prior art, centrifugal fan of the present invention is air-guiding effectively, produce with the phenomenon that reduces the air return leak pressure, and can be by the size of adjusting wind inlet to be added to air quantity.In addition, can be because of the environment that uses different or according to the air pressure in housing, shape or the setting position of protuberance adjusted or change, being added to air quantity, and then obtain best heat radiation function.

The above is only illustrative, but not is restricted.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in appended claim.

Claims

1. a centrifugal fan, is characterized in that, comprising:

One impeller has an axle center and a flabellum; And

One housing, this housing coats this impeller, this housing has a upper casing, a lower casing, at least one protuberance and one first wind inlet, wherein, this protuberance be arranged at this upper casing and this lower casing at least one of them, and be arranged at this flabellum around, this first wind inlet is arranged at this upper casing, this first wind inlet has a first area and a second area, and the radius of this first area is greater than the radius of this second area.

2. centrifugal fan as claimed in claim 1, wherein this housing also has an exhaust outlet, is arranged between this upper casing and lower casing.

3. centrifugal fan as claimed in claim 1, wherein take this axle center as the center of circle, the angle of this first area is less than 270 degree.

4. centrifugal fan as claimed in claim 1, wherein this protuberance is ring-type or circular-arc.

5. centrifugal fan as claimed in claim 1, wherein this lower casing has a throat.

6. centrifugal fan as claimed in claim 2, wherein this protuberance is arranged at this upper casing or this lower casing near a side of this exhaust outlet.

7. centrifugal fan as claimed in claim 2, wherein this protuberance is arranged at this upper casing or this lower casing away from a side of this exhaust outlet.

8. centrifugal fan as claimed in claim 1, this housing has a plurality of protuberances, described a plurality of protuberances be arranged at respectively this upper casing and this lower casing at least one of them.

9. centrifugal fan as claimed in claim 1, wherein this housing also has one second wind inlet, is arranged at this lower casing.