CN201705690U - Cooling fan - Google Patents

Abstract

Disclosed is a cooling fan, comprising a fan frame, a coil group, a fan wheel and a circuit board. The fan frame is provided with a side wall part, the inside of the side wall part is provided with a base, the base is provided with a coupling part. The coil group is combined at the inside of the fan frame. The fan wheel contains a hub, a plurality of blades as well as a permanent magnet, the hub is combined with the coupling part, each blade is arranged at the peripheral surface of the hub, and each blade has a radial rotating range, the permanent magnet is combined at the inside of the hub and an air-gap is formed between the permanent magnet and the coil group. The circuit board is combined at the base of the fan frame and is electrically connected with the coil group, the circuit board is provided with at least one electronic component which is located within the radial rotating range of each blade. Thereby, under the condition without increasing the whole width of the fan frame, the whole axial height of the cooling fan can be decreased effectively.

Description

Radiation fan

Technical field

The utility model is about a kind of radiation fan, especially a kind of radiation fan that reduces whole axial height.

Background technique

Existing radiation fan roughly can be divided into two kinds in axial-flow type radiator fan and blast-type cooling fan.Please refer to shown in Figure 1ly, disclose comparatively common existing axial-flow type radiator fan 6, this radiation fan 6 roughly has a fan frame 61, a stator 62, a rotor 63 and a circuit board 64.This fan frame 61 has a pedestal 611, and this pedestal 611 is in conjunction with a central siphon 612; This stator 62 is incorporated into the central siphon 612 of this fan frame 61; This rotor 63 comprises a wheel hub 631, several blades 632 and a permanent magnet 633, and this wheel hub 631 is rotatably in conjunction with this central siphon 612, and respectively this blade 632 is incorporated into the outside circumference of this wheel hub 631, and this permanent magnet 633 is incorporated into this wheel hub 631 inboards; This circuit board 64 have in order to several electronic components 641 that drive this stator 62 (for example resistance, electric capacity ... etc.); Whereby, can form air gap between this permanent magnet 633 and this stator 62, so that behind these stator 62 energising generation magnetic fields of each electronic component 641 control of this circuit board 64, can drive this rotor 63 rotary works.

Because the circuit board 64 of above-mentioned existing axial-flow type radiator fan 6 respectively this electronic component 641 is arranged between this pedestal 611 and this wheel hub 631, therefore, when reality is used, still have problems as described below (though this paper is example with the axial-flow type radiator fan, but the blast-type cooling fan also has same problem):

1, radiating effect is not good: each electronic component 641 of this circuit board 64 lacks suitable cooling mechanism, if the heat energy that is produced when respectively this electronic component 641 is worked can't disperse immediately, then too high temperature will reduce the respectively task performance of this electronic component 641 easily, even may influence the working life of this radiation fan 6.

2, can't reduce axial height: since respectively this electronic component 641 between this pedestal 611 and this wheel hub 631, cause to have a spacing between this pedestal 611 and this wheel hub 631, the axial height of this spacing must bring up to be enough to ccontaining and can not influence the rotary work of this rotor 63 for this electronic component respectively 641, therefore, the whole axial height of this radiation fan 6 is difficult for reduction, can't be towards more compact direction research and development design.

For addressing the above problem, claimant's research and development of the present utility model have following described several radiation fans, wherein:

Please refer to shown in Figure 2ly, be I290673 number " radiation fan " patent of TaiWan, China case, this existing radiation fan 7 comprises a housing 71, an impeller 72 and a circuit board 73.This housing 71 and this impeller 72 keep specific relative assembled relation, this impeller 72 has a wheel hub 721, the outer circumferential face of this wheel hub 721 forms several blades 722, this circuit board 73 is incorporated into a pedestal 711 surfaces of this housing 71 and has several electronic components, and respectively this electronic component is divided into heat-generating electronic elements 731 and reached not heat-generating electronic elements 732.Should have radiation fan 7 is mainly protruded out at least one heat-generating electronic elements 731 of this circuit board 73 blade 722 of this impeller 72 by this pedestal 711 leeward now.Whereby, the air-flow that this impeller 72 is driven also can reduce the temperature of this heat-generating electronic elements 731 simultaneously, to improve the working life of this radiation fan 7.

Though above-mentioned existing radiation fan 7 moves to the leeward of this blade 722 with at least one heat-generating electronic elements 731, to provide this circuit board 73 preferable cooling mechanism.Yet, because the not heat-generating electronic elements 732 of this circuit board 73 and part heat-generating electronic elements 731 are still between this pedestal 711 and this wheel hub 721, therefore, spacing between this pedestal 711 and this wheel hub 721 also can't further be dwindled, and the whole axial height that still can't solve this radiation fan 7 is difficult for problems such as reduction.

Please refer to shown in Figure 3ly, be No. the 87208714th, TaiWan, China application " the ultra-thin wind drum improvement structure of orientable air-supply " patent case, this existing radiation fan 8 has a base 81, and this base 81 can be in conjunction with an impeller 82; In addition, this base 81 is also in conjunction with a circuit board 83, this circuit board 83 has several electronic components, respectively this electronic component is divided into sense cell 831 and control piece 832, these sense cell 831 parts are embedded in the counterbore 833 of this circuit board 83, and this control piece 832 is positioned at outside the radially rotating range of this impeller 82; Whereby, so that further reduce the whole axial height of this radiation fan 8.

Though above-mentioned existing radiation fan 8 moves to this control piece 832 outside the radially rotating range of this impeller 82, to reach the purpose of the whole axial height that reduces this radiation fan 8.Yet, also be positioned at outside the radially rotating range of this impeller 82 owing to this control piece 832, cause the integral width of this radiation fan 8 to increase relatively, therefore, though should can reach the purpose of reducing axial height by existing radiation fan 8, but cause the integral width of this radiation fan 8 to increase on the contrary, so still can't be towards more compact direction research and development design.Moreover this circuit board 83 must be processed to form this counterbore 833 in addition for ccontaining this sense cell 831, causes structure complexity also to increase relatively; In addition, also because this control piece 832 is positioned at outside the radially rotating range of this impeller 82, therefore, it is still quite limited that this impeller 82 can offer the radiating effect of this control piece 832.

Please refer to shown in Figure 4ly, be No. 337965 " radiation fan " patents of TaiWan, China application M case, this existing radiation fan 9 comprises a framework 91 and an impeller 92.One side frame limit of this framework 91 forms a bearing part 911, for one drive circuit plate 93 is set; 92 of this impellers rotatably are arranged in this framework 91.

Above-mentioned existing radiation fan 9 further is arranged at this driving circuit board 93 the formed bearing part 911 of a side of this framework 91, so also can reduce the whole axial height of this radiation fan 9.Yet, because a side of this framework 91 is formed with this bearing part 911, therefore, cause the integral width of this radiation fan 9 to increase relatively equally, and the structure complexity of this framework 91 also improves relatively, still can't design towards more compact direction research and development, and increases whole manufacture cost.

The model utility content

The utility model purpose is the above-mentioned various existing radiation fan shortcomings of improvement, under the condition that does not increase fan frame integral width, provides a kind of radiation fan that can effectively reduce axial height.

Another purpose of the utility model provides a kind of radiation fan with preferable radiating effect.

The another purpose of the utility model provides the radiation fan that a kind of structure is comparatively simplified.

For reaching aforementioned model utility purpose, the technology contents that the utility model used is as follows:

A kind of radiation fan comprises a fan frame, a coil groups, an impeller and a circuit board.This fan frame has a side wall portion, and this side wall portion inboard is provided with a pedestal, and this pedestal is provided with an axis part; This coil groups is incorporated into the inboard of this fan frame; This impeller comprises a wheel hub, several blades and a permanent magnet, this wheel hub is in conjunction with this axis part, respectively this blade is located at the outer circumferential face of this wheel hub, respectively this blade has a rotating range radially, and respectively this blade has the ora terminalis towards this pedestal respectively, respectively the ora terminalis of this blade is to forming a containing space between this pedestal, this permanent magnet be incorporated into this wheel hub inboard and and this coil groups between form air gap; This circuit board is incorporated into the pedestal of this fan frame and is electrically connected this coil groups, and this circuit board is provided with at least one electronic component, and this at least one electronic component is arranged at this containing space and is positioned at the respectively radially rotating range of this blade.

In addition, the utility model radiation fan also can comprise a fan frame, a coil groups, an impeller and a circuit board.This fan frame has a side wall portion, and this side wall portion inboard is provided with a pedestal, and this pedestal is provided with an axis part; This coil groups is incorporated into the inboard of this fan frame; This impeller comprises a wheel hub, several blades and a permanent magnet, this wheel hub is in conjunction with this axis part, respectively this blade mutually combines by a junction and this wheel hub, respectively this blade has one first end and one second end respectively, this first end is near this wheel hub, this second end is away from this wheel hub, this impeller axially on, respectively this blade and this joint are to forming a containing space between this pedestal, respectively have a rotating range radially between the outer circumferential face of second end of this blade and this wheel hub, this permanent magnet be incorporated into this wheel hub inboard and and this coil groups between form air gap; This circuit board is incorporated into the pedestal of this fan frame and is electrically connected this coil groups, and this circuit board is provided with at least one electronic component, and this at least one electronic component is arranged at this containing space and is positioned at the respectively radially rotating range of this blade.

Useful technique effect of the present utility model is: by the ora terminalis of this blade respectively between this pedestal or respectively this blade and this joint to forming a containing space between this pedestal, to hold electronic component, under the condition that does not increase fan frame integral width, effectively reduce the whole axial height of this radiation fan, and can increase thermolysis electronic component.

Description of drawings

Fig. 1: the assembled sectional view of first kind of existing radiation fan.

Fig. 2: the assembled sectional view of second kind of existing radiation fan.

Fig. 3: the assembled sectional view of the third existing radiation fan.

Fig. 4: the assembled sectional view of the 4th kind of existing radiation fan.

Fig. 5: the three-dimensional exploded view of the utility model first embodiment's radiation fan.

Fig. 6: the plan view of the utility model first embodiment's radiation fan.

Fig. 7: the assembled sectional view of the utility model first embodiment's radiation fan.

Fig. 8: the three-dimensional exploded view of the utility model second embodiment's radiation fan.

Fig. 9: the plan view of the utility model second embodiment's radiation fan.

Figure 10: the assembled sectional view of the utility model second embodiment's radiation fan.

Figure 11: the three-dimensional exploded view of the utility model the 3rd embodiment's radiation fan.

Figure 12: the plan view of the utility model the 3rd embodiment's radiation fan.

Figure 13: the assembled sectional view of the utility model the 3rd embodiment's radiation fan.

The primary component symbol description

1 radiation fan, 11 fan frames, 111 side wall portions, 112 wind inlets

113 exhaust outlets, 114 pedestals, 115 axis parts, 116 links

12 coil groups, 13 impellers, 131 wheel hub 131a bottoms

132 blade 132a ora terminalis, 133 permanent magnets, 134 containing spaces

14 circuit boards, 141 electronic components, 2 radiation fans, 21 fan frames

211 side wall portions, 212 wind inlets, 213 exhaust outlets, 214 pedestals

215 axis parts, 216 cover plate 216a, 22 coil groups of boring a hole

23 impellers, 231 wheel hub 231a bottoms, 232 blades

232a ora terminalis 233 permanent magnets 234 containing spaces 24 circuit boards

241 electronic components, 3 radiation fans, 31 fan frames, 311 side wall portions

312 wind inlets, 313 exhaust outlets, 314 pedestals, 315 axis parts

316 cover plate 316a, 32 coil groups, 33 impellers of boring a hole

331 wheel hubs, 332 blade 332a, the first end 332b, second end

333 permanent magnets, 334 containing spaces, 335 joint 335a ribs

335b ring 34 circuit boards 341 electronic components 6 radiation fans

61 fan frames, 611 pedestals, 612 central siphons, 62 stators

63 rotors, 631 wheel hubs, 632 blades, 633 permanent magnets

64 circuit boards, 641 electronic components, 7 radiation fans, 71 housings

711 pedestals, 72 impellers, 721 wheel hubs, 722 blades

73 circuit boards, 731 heat-generating electronic elements 732 are heat-generating electronic elements 8 radiation fans not

81 bases, 82 impellers, 83 circuit boards, 831 sense cells

832 control pieces, 833 counterbores, 9 radiation fans, 91 frameworks

911 bearing parts, 92 impellers, 93 driving circuit boards

Embodiment

For above-mentioned and other purpose of the present utility model, feature and advantage can be become apparent, preferred embodiment of the present utility model cited below particularly, and conjunction with figs. are described in detail below:

Please refer to shown in Fig. 5,6 and 7, the utility model first embodiment's radiation fan 1 comprises a fan frame 11, a coil groups 12, an impeller 13 and a circuit board 14.The fan frame 11 that present embodiment disclosed is mainly used in axial-flow type radiator fan, and is applicable to the radiation fan of no sensor motor; This coil groups 12 is in conjunction with this fan frame 11; This impeller 13 rotatably is incorporated into this fan frame 11 inboards, and this circuit board 14 is electrically connected this coil groups 12, in order to drive these impeller 13 rotary works by this coil groups 12.

This fan frame 11 has a side wall portion 111, and this side wall portion 111 is provided with a wind inlet 112 and an exhaust outlet 113; Again, these side wall portion 111 inboards are provided with a pedestal 114, and this pedestal 114 is provided with an axis part 115, and this axis part 115 can select one in conjunction with this pedestal 114 or be assembled on this pedestal 114; In present embodiment, this pedestal 114 interconnects with this side wall portion 111 by several links 116, and this link 116 can be the design of stator blade or rib, to constitute the fan frame of axial-flow type radiator fan.

This coil groups 12 is incorporated into the inboard of this fan frame 11.Wherein this coil groups 12 can directly be incorporated into the outer circumferential face of this axis part 115, and perhaps, this coil groups 12 also can directly be incorporated into pedestal 114 or other suitable positions of this fan frame 11.

This impeller 13 comprises a wheel hub 131, several blades 132 and a permanent magnet 133.This wheel hub 131 is rotatably in conjunction with this axis part 115, and this wheel hub 131 has the bottom 131a towards this pedestal 114, has a gap (D) between this bottom 131a and this pedestal 114; Respectively this blade 132 is located at the outer circumferential face of this wheel hub 131, wherein shown in Fig. 6 and 7, respectively this blade 132 has a rotating range (R) radially, and respectively this blade 132 has the ora terminalis 132a towards this pedestal 114 respectively, this impeller 13 axially on, respectively the ora terminalis 132a of this blade 132 is to forming a containing space 134 between this pedestal 114; This permanent magnet 133 is incorporated into this wheel hub 131 inboards, and has air gap between this permanent magnet 133 and this coil groups 12.

This circuit board 14 is incorporated into the pedestal 114 of this fan frame 11, and this circuit board 14 is electrically connected this coil groups 12.Again, this circuit board 14 is provided with in order to drive several electronic components 141 (visual demand is integrated into single electronic component) of these coil groups 12 work, respectively this electronic component 141 is arranged at this containing space 134 and is positioned at the respectively radially rotating range (R) of this blade 132, order respectively this electronic component 141 relatively outside formed gap (D) between this bottom 131a and this pedestal 114, so that reduce the whole axial height of the utility model radiation fan 1.

More in detail, this impeller 13 axially on, the bottom 131a of this wheel hub 131 is to the distance of this pedestal 114, less than the ora terminalis 132a of this blade 132 respectively distance to this pedestal 114; Whereby, make to have a height difference between this ora terminalis 132a and this bottom 131a, so that utilize this height difference to form this containing space 134.

The main feature of the utility model first embodiment's radiation fan 1 is: each electronic component 141 of this circuit board 14 is positioned at the leeward of each blade 132 of this impeller 13, therefore, when this impeller 13 in the process of rotary work, the air-flow that this impeller 13 is driven can directly provide respectively this electronic component 141 preferable radiating effect.In addition, the utility model radiation fan 1 more moves to the respectively radially rotating range (R) of this blade 132 with each electronic component 141 of this circuit board 14, and respectively this electronic component 141 is arranged at this containing space 134, whereby, make that formed gap (D) do not hold any electronic component 141 between this bottom 131a and this pedestal 114, therefore, the bottom 131a of the wheel hub 131 of this impeller 13 can more be close to this circuit board 14, with the whole axial height of this radiation fan 1 of effective reduction.

The more important thing is, also because each electronic component 141 of this circuit board 14 is positioned at the radially rotating range (R) of each blade 132 of this impeller 13, make that the utility model radiation fan 1 need not be in order to reduce whole axial height, and respectively this electronic component 141 is provided with outside the radially rotating range of this impeller 13, therefore, but fan frame 11 of the present utility model need not increase width or design the structural design (the existing radiation fans 8,9 shown in Fig. 3 and 4) of other containment circuit boards 14; Generally speaking, the utility model radiation fan 1 can provide a kind of and can effectively reduce the radiation fan 1 that axial height and structure are more simplified really not increasing fan frame 11 integral width or increasing under the condition of structure complexity.

Please refer to shown in Fig. 8,9 and 10, the utility model second embodiment's radiation fan 2 comprises a fan frame 21, a coil groups 22, an impeller 23 and a circuit board 24.The fan frame 21 that present embodiment disclosed is mainly used in the blast-type cooling fan, is particularly useful for not having the radiation fan of sensor motor; This coil groups 22 is in conjunction with this fan frame 21; This impeller 23 rotatably is incorporated into this fan frame 21 inboards, and this circuit board 24 is electrically connected this coil groups 22, in order to drive these impeller 23 rotary works by this coil groups 22.

This fan frame 21 has a side wall portion 211, this side wall portion 211 is provided with a wind inlet 212 and an exhaust outlet 213, these wind inlet 212 preferable cover plates 216 that are provided with wherein, this cover plate 216 are provided with a perforation 216a who is communicated with this wind inlet 212, and this exhaust outlet 213 is positioned at the side of this fan frame 21; Again, these side wall portion 211 inboards are provided with a pedestal 214, and this pedestal 214 is provided with an axis part 215; In present embodiment, the outer periphery of this pedestal 214 connect this side wall portion 211, make this side wall portion 211 can center on this pedestal 214, to constitute the fan frame of blast-type cooling fan.

This coil groups 22 is incorporated into the inboard of this fan frame 21.Wherein this coil groups 22 can directly be incorporated into the outer circumferential face of this axis part 215, and perhaps, this coil groups 22 also can directly be incorporated into pedestal 214 or other suitable positions of this fan frame 21.

This impeller 23 comprises a wheel hub 231, several blades 232 and a permanent magnet 233.This wheel hub 231 is rotatably in conjunction with this axis part 215, and this wheel hub 231 has the bottom 231a towards this pedestal 214, has a gap (D) between this bottom 231a and this pedestal 214; Respectively this blade 232 is located at the outer circumferential face of this wheel hub 231, wherein shown in Fig. 9 and 10, respectively this blade 232 has a rotating range (R) radially, and respectively this blade 232 has the ora terminalis 232a towards this pedestal 214 respectively, this impeller 23 axially on, respectively the ora terminalis 232a of this blade 232 is to forming a containing space 234 between this pedestal 214; This permanent magnet 233 is incorporated into this wheel hub 231 inboards, and has air gap between this permanent magnet 233 and this coil groups 22.

This circuit board 24 is incorporated into the pedestal 214 of this fan frame 21, and this circuit board 24 is electrically connected this coil groups 22.Again, this circuit board 24 is provided with in order to drive several electronic components 241 (visual demand is integrated into single electronic component) of these coil groups 22 work, respectively this electronic component 241 is arranged at this containing space 234 and is positioned at the respectively radially rotating range (R) of this blade 232, and order respectively this electronic component 241 is positioned at outside this gap (D) relatively.

More in detail, this impeller 23 axially on, each blade 232 of this impeller 23 connects the axial height of an end of this wheel hub 231, less than the axial height of each blade 232 away from an end of this wheel hub 231, making that respectively an end of these blade 232 contiguous these wheel hubs 231 has is large enough to hold the respectively containing space 234 of this electronic component 241, end away from this wheel hub 231 then has bigger wind dispelling area, so that this impeller 23 is after the top is introduced air communication and crossed this wind inlet 212, can be more effectively the air-flow side direction be pushed out to this exhaust outlet 213 by this blade 232 respectively.For example, respectively this blade 232 of present embodiment forms a groove in the ora terminalis 232a of an end that connects this wheel hub 231, and this groove forms this containing space 234, whereby, this impeller 23 can guarantee that each blade 232 of this impeller 23 more is difficult for touching respectively this electronic component 241 when rotary work.

The utility model second embodiment's radiation fan 2 and aforementioned first embodiment's radiation fan 1 all can utilize this impeller 23 to provide respectively this electronic component 241 preferable radiating effect, and can under the condition that does not increase fan frame 21 integral width, effectively reduce the whole axial height of this radiation fan 2 equally.The more important thing is, water conservancy diversion direction (introduce air-flow and side direction from the top and release air-flow) based on the impeller 23 of the fan frame of general blast-type cooling fan, therefore, when each blade 232 connects the axial height of an end of these wheel hubs 231 less than away from the axial height of an end of this wheel hub 231 time, respectively this blade 232 has bigger wind dispelling area away from an end of this wheel hub 231, be beneficial to this impeller 23 and carry out thermolysis, in addition, this blade 232 connects in formed this containing space 234 of an end of these wheel hubs 231 more can conveniently to make this electronic component 241 respectively be located immediately at respectively, and is also quite convenient on assembling is used; So better blast-type cooling fan that is applicable to of major technique feature of the present utility model.

Please refer to shown in Figure 11,12 and 13, the utility model the 3rd embodiment's revolution part comprises a fan frame 31, a coil groups 32, an impeller 33 and a circuit board 34.Wherein the structure characteristic of the fan frame 31 of present embodiment and coil groups 32 and second embodiment's fan frame 21 and coil groups 22 is identical, does not give unnecessary details in this appearance.

The difference of the utility model the 3rd embodiment's impeller 33 and second embodiment's impeller 23 is: this impeller 33 comprises a wheel hub 331, several blades 332, a permanent magnet 333.This wheel hub 331 is incorporated into the axis part 315 of this fan frame 31 equally; Respectively this blade 332 mutually combines by a junction 335 and this wheel hub 331, this impeller 33 axially on, respectively this blade 332 and this joint 335 are to forming a containing space 334 between this pedestal 314; This permanent magnet 333 is incorporated into this wheel hub 331 inboards, and has air gap between this permanent magnet 333 and this coil groups 32.

More in detail, in the present embodiment, this joint 335 comprises several a ribs 335a and a ring 335b, and respectively the end of this rib 335a connects the outer circumferential face of this wheel hub 331, the other end connects this ring 335b, makes this ring 335b can center on respectively this rib 335a and this wheel hub 331; Again, respectively this blade 332 is incorporated into this ring 335b respectively, and respectively this blade 332 has one first end 332a and one second end 332b, this first end 332a is near this wheel hub 331, this second end 332b is away from this wheel hub 331, wherein as shown in figure 13, respectively has a rotating range (R) radially between the outer circumferential face of the second end 332b of this blade 332 and this wheel hub 331.

This circuit board 34 is incorporated into the pedestal 314 of this fan frame 31, and this circuit board 34 is electrically connected this coil groups 32.Again, this circuit board 34 is provided with in order to drive several electronic components 341 (visual demand is integrated into single electronic component) of these coil groups 32 work, and respectively this electronic component 341 is arranged at this containing space 334 and is positioned at the respectively radially rotating range (R) of this blade 332; Wherein this impeller 33 axially on, respectively this electronic component 341 is preferable relative with this joint 335.

The utility model the 3rd embodiment's radiation fan 3 is compared with aforementioned first and second embodiment's radiation fan 1,2, also can utilize this impeller 33 to provide respectively this electronic component 341 preferable radiating effect, and can under the condition that does not increase fan frame 31 integral width, effectively reduce the whole axial height of this radiation fan 3 equally.

By on learn, the utility model radiation fan 1,2,3 really can be under the condition that does not increase fan frame 11,21,31 integral width, effectively reduce the whole axial height of this radiation fan 1,2,3, and, quite be fit to towards more compact direction research and development design with excellent in heat dissipation effect and plurality of advantages such as simple in structure.

Claims (11)

1. radiation fan is characterized in that comprising:

A fan frame has a side wall portion, and this side wall portion inboard is provided with a pedestal, and this pedestal is provided with an axis part;

A coil groups is incorporated into the inboard of this fan frame;

An impeller, comprise a wheel hub, several blades and a permanent magnet, this wheel hub is in conjunction with this axis part, respectively this blade is located at the outer circumferential face of this wheel hub, respectively this blade has radially rotating range, and respectively this blade has a ora terminalis towards this pedestal respectively, this impeller axially on, respectively the ora terminalis of this blade forms containing space between this pedestal, this permanent magnet be incorporated into this wheel hub inboard and and this coil groups between form air gap; And

A circuit board is incorporated into the pedestal of this fan frame and is electrically connected this coil groups, and this circuit board is provided with at least one electronic component, and this at least one electronic component is arranged at this containing space and is positioned at the respectively radially rotating range of this blade.

2. according to the described radiation fan of claim 1, it is characterized in that, this wheel hub has a bottom towards this pedestal, has the gap between this bottom and this pedestal, this impeller axially on, the bottom of this wheel hub to the distance of this pedestal less than the ora terminalis of this blade respectively distance to this pedestal, have height difference between this ora terminalis and this bottom, this height difference forms this containing space.

3. according to the described radiation fan of claim 1, it is characterized in that, this impeller axially on, the axial height of an end that each blade of this impeller connects this wheel hub less than this blade respectively away from the axial height of an end of this wheel hub.

4. according to the described radiation fan of claim 3, it is characterized in that respectively this blade forms a groove in the ora terminalis of an end that connects this wheel hub, this groove forms this containing space.

5. according to claim 1,2,3 or 4 described radiation fans, it is characterized in that the pedestal of this fan frame interconnects by several links and this side wall portion.

6. according to claim 1,2,3 or 4 described radiation fans, it is characterized in that the outer periphery of the pedestal of this fan frame connect this side wall portion, this side wall portion is around this pedestal.

7. radiation fan is characterized in that comprising:

A fan frame has a side wall portion, and this side wall portion inboard is provided with a pedestal, and this pedestal is provided with an axis part;

A coil groups is incorporated into the inboard of this fan frame;

An impeller, comprise a wheel hub, several blades and a permanent magnet, this wheel hub is in conjunction with this axis part, respectively this blade mutually combines by a joint and this wheel hub, respectively this blade has one first end and one second end respectively, this first end is near this wheel hub, this second end is away from this wheel hub, this impeller axially on, respectively this blade and this joint form containing space between this pedestal, respectively have radially rotating range between the outer circumferential face of second end of this blade and this wheel hub, this permanent magnet be incorporated into this wheel hub inboard and and this coil groups between form air gap; And

A circuit board is incorporated into the pedestal of this fan frame and is electrically connected this coil groups, and this circuit board is provided with at least one electronic component, and this at least one electronic component is arranged at this containing space and is positioned at the respectively radially rotating range of this blade.

8. according to the described radiation fan of claim 7, it is characterized in that, this impeller axially on, respectively this electronic component is relative with this joint.

9. according to claim 7 or 8 described radiation fans, it is characterized in that this joint comprises several ribs and a ring, respectively an end of this rib connects the outer circumferential face of this wheel hub, and the other end connects this ring, and this ring centers on respectively this rib and this wheel hub.

10. according to claim 7 or 8 described radiation fans, it is characterized in that the pedestal of this fan frame interconnects by several links and this side wall portion.

11., it is characterized in that this side wall portion is around this pedestal according to claim 7 or 8 described radiation fans.

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