CN101377201B

CN101377201B - Centrifugal fan

Info

Publication number: CN101377201B
Application number: CN 200710148383
Authority: CN
Inventors: 林星晨
Original assignee: Delta Optoelectronics Inc
Current assignee: Delta Electronics Inc; Delta Optoelectronics Inc
Priority date: 2007-08-31
Filing date: 2007-08-31
Publication date: 2013-05-22
Anticipated expiration: 2027-08-31
Also published as: CN101377201A

Abstract

The present invention discloses a centrifugal fan, which comprises a blade body and a shell. The shell is provided with a containing part, a throat part and a concave part; wherein, the blade body is arranged in the containing part; a first axial line and a second axial line, which are vertical to each other at the central point of the shell, divide the shell into four areas; and the throat part and the concave part are positioned in a first area.

Description

Centrifugal fan

Technical field

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

Background technique

Along with development electric, electronic product, its also relative increase of demand to heat radiation is so heat dissipation technology also becomes one of development priority of computer technology.Have the advantages such as low cost, technology maturation due to fan, therefore be used as the sink in product.

Please refer to shown in Figure 1ly, existing centrifugal fan 1 comprises a flabellum body 11 and a housing 12.This housing 12 has a holding part 121, and this flabellum body 11 is arranged in this holding part 121.In addition, this housing 12 has more an exhaust outlet h1 and a T1 of throat, and wherein the T1 of this throat is adjacent to this exhaust outlet h1.The setting of the T1 of this throat is should be taken back in this holding part 121 by this flabellum body 11 by the air-flow that this exhaust outlet h1 discharges for fear of former, thereby has reduced the discharge air quantity.

Yet, please be simultaneously referring to figs. 1 through shown in Fig. 2 B, Fig. 2 A is the projection ratio spectrogram of existing centrifugal fan 1, and Fig. 2 B is the noise pattern of existing centrifugal fan 1.Can be found by Fig. 2 B, existing centrifugal fan 1 can produce a higher flabellum frequency peak P2 in this noise pattern when a certain flabellum rotating speed, and wherein this flabellum frequency peak P2 is about 25 decibels (dB).And for example Fig. 2 A can find, corresponding in Fig. 2 B this flabellum frequency peak P2 place, existing centrifugal fan can produce a projection ratio peak value P1 (being about 5.24 decibels).Therefore, though can avoid the generation of these holding part 121 air returns by the setting of the T1 of this throat, the quick variation that produces pressure because air-flow constantly impacts the T1 of this throat also, and then cause existing centrifugal fan 1 to produce this higher flabellum frequency peak P2 and the problem of this projection ratio peak value P1.

Therefore, how to design a kind of flabellum frequency noise of avoiding excessive, and reduce the centrifugal fan of projection ratio, real one of the present important topic that belongs to.

Summary of the invention

Because above-mentioned problem the object of the present invention is to provide a kind of flabellum frequency noise of avoiding excessive, and reduce the centrifugal fan of projection ratio.

Edge is for reaching above-mentioned purpose, to comprise a flabellum body and a housing according to a kind of centrifugal fan of the present invention.This housing has a throat and a recess, wherein this flabellum body is contained in this housing, and a mutually perpendicular first axle and one second axis are divided into four zones with this housing with the central point of this housing, and this throat is positioned at a first area, and this recess is arranged at this first area.

From the above, a kind of centrifugal fan of the present invention arranges a recess on this bottom of this throat of close this housing, can increase thus air-flow at free air space and the air-guiding flow direction of this throat's near zone, constantly impact to reduce air-flow the pressure that this throat's near zone is produced, and improve the flow field of this throat's near zone and the graded of pressure, and then avoid centrifugal fan to produce higher flabellum peak value frequently, and then reduce the projection ratio peak value.

Description of drawings

Fig. 1 is for showing the schematic diagram of existing centrifugal fan;

Fig. 2 A is the projection ratio spectrogram of existing centrifugal fan, and Fig. 2 B is the noise pattern of existing centrifugal fan;

Fig. 3 A is the schematic diagram according to the centrifugal fan of first embodiment of the invention;

Fig. 3 B is the plan view according to the first sub-housing figure of the centrifugal fan of first embodiment of the invention;

Fig. 4 A is the schematic diagram according to the first sub-housing of the centrifugal fan of second embodiment of the invention, and Fig. 4 B is the plan view as the first sub-housing of Fig. 4 A;

Figure 5 shows that the schematic diagram according to the first sub-housing of the centrifugal fan of third embodiment of the invention;

Fig. 6 A is the projection ratio spectrogram that has as the centrifugal fan of the first sub-housing of Fig. 5, and Fig. 6 B is the noise pattern that has as the centrifugal fan of the first sub-housing of Fig. 5;

Fig. 7 A is depicted as the schematic diagram according to the first sub-housing of the centrifugal fan of fourth embodiment of the invention;

Fig. 7 B and Fig. 7 C are depicted as the first different state of changing schematic diagram of sub-housing according to the centrifugal fan of fifth embodiment of the invention;

Figure 8 shows that the first whole schematic diagram of sub-housing according to the centrifugal fan of sixth embodiment of the invention;

Fig. 9 A is depicted as the schematic diagram according to the centrifugal fan of seventh embodiment of the invention;

Fig. 9 B is depicted as the constitutional diagram of Fig. 9 A.

The primary component symbol description

1,2,3:

centrifugal fan

11,21,41: the flabellum body

111,211,411: axle

center

12,22,42: housing

121,221,4211: holding part 222,4231: the axle center fixed point

223a: the wall 223b of section, 323b: bottom

223,323,323A, 323B, 323C, 323D, 421: the first sub-housings

224,423: the three sub-housings of 422: the second sub-housings

4212: open-work

23,33,33A, 33B, 33C, 33D, 43: recess

C: sub-recess F: air-flow

L1: first axle L2: the second axis

L3: the 3rd axis h1, H1, H4: exhaust outlet

H2, H3, H5, H6: wind inlet P1: projection ratio peak value

P2: flabellum frequency peak S, S1: inclined-plane

T1, T2, T3, T4: the Z1 of throat: first area

Z2: second area Z2a: the first subregion

Z2b: the second subregion

Embodiment

Hereinafter with reference to relevant drawings, illustrate according to centrifugal fan of the present invention.

Please refer to shown in Fig. 3 A, the centrifugal fan 2 of first embodiment of the invention comprises a flabellum body 21 and a housing 22.

This flabellum body 21 has an axle center 211.This housing 22 has a holding part 221, axle center fixed point 222, one T2 of throat and a recess 23.In addition, this housing 22 has more one first sub-housing 223, one second sub-housing 224 and an exhaust outlet H1.Wherein this first sub-housing 223 has a wall 223a of section, a bottom 223b and a wind inlet H2, and this wall 223a of section arranges around the 223b of this bottom, and this second sub-housing 224 has a wind inlet H3.

This flabellum body 21 should axle center fixed point 222 with 211 pairs, this axle center and be arranged in this holding part 221.Again, please refer to shown in Fig. 3 B, it is the plan view of this first housing 223, if a mutually perpendicular first axle L1 and the one second axis L2 of point divide into four zones with this first sub-housing 223 centered by this axle center fixed point 222, the T2 of this throat is positioned at a first area Z1.This recess 23 is arranged at this bottom 223b of this first area Z1, and is adjacent to this exhaust outlet H1.

Therefore, after this flabellum body 21 began rotation, the direction of air-flow F can be inhaled into by this two wind inlet H2, H3, and along with the sense of rotation of this flabellum body 21 (for example being counterclockwise) certainly this exhaust outlet H1 be discharged from.

Then part air-flow F is due to effect of inertia, still can flow along with the sense of rotation of this flabellum body 21, thereby impacts as avoiding interference air return and produce the set T2 of this throat, and the air pressure of the T2 of this throat is produced fast change.Therefore, the present embodiment increases the free air space of the T2 of this throat near zone air-flow F by the setting of this recess 23, part air-flow F can be flowed along with the bearing of trend of this recess 23, thereby reduced the gas shock T2 of this throat.

Therefore, can increase these air-flows F at the free air space of the T2 of this throat near zone by arranging of this recess 23, and reduce air-flow F and constantly impact the pressure that the T2 of this throat near zone produces, with the flow field of improving the T2 of this throat near zone and the graded of pressure.

Please be simultaneously with reference to shown in Fig. 4 A and Fig. 4 B, Fig. 4 A is the schematic diagram of one first sub-housing 323 of the centrifugal fan of second embodiment of the invention, Fig. 4 B is the plan view of this first sub-housing 323.Therefore the difference of the present embodiment and previous embodiment is that this first sub-housing 323 of the centrifugal fan 3 of the present embodiment more comprises one the 3rd axis L3 that are 45 degree with this first axle L1, and a second area Z2 of this first area Z1 adjacency is divided into one first subregion Z2a and one second subregion Z2b.And this recess 33 more extending design at least a portion of this bottom 323b of this first subregion Z2a, in the present embodiment, is that this bottom 323b take this first subregion Z2a is also as explaining as this recess 33 as example.

By the extension of these recess 33 scopes, also make air-flow in the increase that extends internally of the free air space of the T3 of this throat near zone, also can reach the effect that reduces the T3 of this throat zone air pressure.

Please refer to the schematic diagram of one first sub-housing 323A of the centrifugal fan that Figure 5 shows that third embodiment of the invention.The difference of the present embodiment and previous embodiment is that this recess 33A is streamlined, can promote thus the effect of this recess 33A steering flow flow direction.

Therefore, if do the test of projection ratio spectrogram and noise pattern with the present embodiment, please refer to shown in Fig. 6 A and Fig. 6 B, wherein Fig. 6 A is the projection ratio spectrogram of the centrifugal fan of the present embodiment, and Fig. 6 B is the noise pattern of the centrifugal fan of the present embodiment.Can find thus, the projection ratio peak value of the centrifugal fan of the present embodiment only is about 2.15 decibels, and the noise spectrum of its flabellum frequency also all maintains below 20 decibels.

Please refer to shown in Fig. 7 A, it is the schematic diagram of one first sub-housing 323B of the centrifugal fan of fourth embodiment of the invention.The difference of the present embodiment and previous embodiment is that this recess 33B except for streamlined, has more an inclined-plane S.Thus except the effect that can promote this recess 33B steering flow flow direction, and because in the middle of this embodiment, this recess 33B does not link with wind inlet (please contrast Fig. 3 A), and make the pressure distribution in this holding part (please contrast Fig. 3 A) different, reduce recess 33B to the impact of fan primary characteristic.

In addition, please refer to shown in Fig. 7 B and Fig. 7 C, for the difference of one first sub-housing 323C of the centrifugal fan of fifth embodiment of the invention changes the aspect schematic diagram.This recess 33C all has this inclined-plane S1, and the shape of this recess 33C can be done different designs.

Please refer to shown in Figure 8ly, it is the schematic diagram of one first sub-housing 323D of the centrifugal fan of sixth embodiment of the invention.The difference of the present embodiment and previous embodiment is that this recess 33D has more a plurality of sub-recess C, and the present embodiment explains as an example of two sub-recess C example.Can increase gas flow space by these different sub-recess C.

At this, it is worth mentioning that in addition above-mentioned each those recesses all are arranged at this bottom 223b of this first sub-housing 223 as shown in Figure 3A, so those recesses also can be arranged at example this second sub-housing 224 as shown in Figure 3A near the zone of the T2 of this throat, and reach identical effect, namely separately do not explain again with accompanying drawing at this.

Shown in Fig. 9 A, it is the schematic diagram of the centrifugal fan of seventh embodiment of the invention.Wherein this centrifugal fan 4 comprises a flabellum body 41 and a housing 42.

This flabellum body 41 has an axle center 411.This housing 42 has a holding part 4211, axle center fixed point 4231, one T4 of throat and a recess 43.In addition, in the present embodiment, this housing 42 has more one first sub-housing 421, one second sub-housing 422, one the 3rd sub-housing 423 and an exhaust outlet H4.Please coordinate simultaneously shown in Fig. 9 B, constitutional diagram for Fig. 9 A, wherein this first sub-housing 421 forms this holding part 4211 with this second sub-housing 422, and the T4 of this throat is formed on this first sub-housing 421, and this first sub-housing 421 has more an open-work 4212 for the 3rd sub-housing 423 combinations.

This second sub-housing 422 and the 3rd sub-housing 423 have respectively a wind inlet H5 and another wind inlet H6, and this axle center fixed point 4231 and this recess 43 all are formed on the 3rd sub-housing 423, the 3rd sub-housing 423 can be established for 41 groups of this flabellum bodies, and be bonded to again on this first sub-housing 421, and make the position of this recess 43 and the T4 of this throat be located in as (please refer to Fig. 3 B) in defined this first area in the middle of the first embodiment.

Therefore, after this flabellum body 41 begins rotation, the direction of air-flow F can be inhaled into by this two wind inlet H5, H6, and along with the sense of rotation of this flabellum body 41 is discharged from from this exhaust outlet H4, and because the setting of this recess 43, can reduce air-flow and constantly impact the pressure that this throat's near zone produces, only this effect has been exposed in aforementioned each embodiment, therefore namely separately do not give unnecessary details at this.

In sum, a kind of centrifugal fan of the present invention arranges a recess on this bottom of the throat of close this housing, can increase thus air-flow at free air space and the air-guiding flow direction of this throat's near zone, constantly impact to reduce air-flow the pressure that this throat's near zone is produced, and improve the flow field of this throat's near zone and the graded of pressure, and then avoid centrifugal fan to produce larger flabellum frequency noise and higher projection ratio peak value.

The above is only illustrative, but not is restricted person.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 comprise in the appended claims.

Claims

1. centrifugal fan comprises:

The flabellum body; And

Housing has throat and recess, and wherein this flabellum body is contained in this housing, and mutually perpendicular first axle and the second axis are divided into four zones with this housing with the central point of this housing, this throat is positioned at the first area, and this recess is arranged at this first area

Wherein this housing also has the first sub-housing and the second sub-housing, and both are connected to each other to form this housing, and

Wherein this first sub-housing also has bottom and wall section, and this wall section arranges along this bottom periphery, and this recess is positioned at this bottom.

2. centrifugal fan comprises:

The flabellum body; And

Wherein this housing also has the 3rd sub-housing for this flabellum body assembling, and this first sub-housing also has open-work for the 3rd sub-housing assembling.

3. centrifugal fan as claimed in claim 2, wherein this recess is formed on the 3rd sub-housing.

4. centrifugal fan comprises:

The flabellum body; And

The 3rd axis that wherein are 45 degree with this first axle are divided into the first subregion and the second subregion with the second area of this first area adjacency.

5. centrifugal fan as claimed in claim 4, wherein this recess also extends at least a portion of this first subregion.

6. centrifugal fan comprises:

The flabellum body; And

Housing, have throat and recess, wherein this flabellum body is contained in this housing, and mutually perpendicular first axle and the second axis are divided into four zones with this housing with the central point of this housing, this throat is positioned at the first area, and this recess is arranged at the bottom of this first area and is adjacent to exhaust outlet

Wherein this recess is streamlined.

7. as claim 1,2,4 or 6 described centrifugal fans, wherein this recess has a plurality of sub-recesses.

8. as claim 1,2,4 or 6 described centrifugal fans, wherein this housing has at least one exhaust outlet and at least one wind inlet, and the wind direction of this exhaust outlet is vertical with the wind direction of this wind inlet.

9. as claim 1,2,4 or 6 described centrifugal fans, wherein this housing has at least one exhaust outlet and at least one wind inlet, and the wind direction of this exhaust outlet is vertical with the wind direction of this wind inlet, and this recess is adjacent to this throat.

10. as claim 1,2,4 or 6 described centrifugal fans, wherein this housing has at least one exhaust outlet and at least one wind inlet, and the wind direction of this exhaust outlet is vertical with the wind direction of this wind inlet, and this recess is connected with this wind inlet.

11. as claim 1,2,4 or 6 described centrifugal fans, wherein this recess has the inclined-plane.