CN220822769U - Fan brushless motor and fan - Google Patents

Abstract

The utility model provides a fan brushless motor and a fan, and relates to the technical field of fans, comprising: the motor support is provided with a motor support shaft with a shaft hole at one end, and a first bearing is coaxially assembled with the shaft hole at the other end; the brushless motor comprises a stator assembly provided with a motor middle hole, wherein the stator assembly is sleeved on a motor supporting shaft through the motor middle hole and fixedly assembled in a motor bracket, and a shaft core penetrating through the shaft hole; one end of the bearing bracket is fixedly assembled with the motor bracket and/or the stator assembly, and the other end of the bearing bracket is coaxially assembled with the shaft hole; the shaft core is rotatably arranged in the middle hole of the motor through a first bearing and a second bearing; the outer diameters of the first bearing and the second bearing are both larger than the inner diameter of the shaft hole. Therefore, the bearing has the advantages of larger size, long service life and difficult noise generation.

Description

Fan brushless motor and fan

Technical Field

The present utility model relates to the field of fans, and in particular, to a brushless motor and a fan.

Background

The fan motor is generally divided into a brush motor and a brushless motor, wherein the brush motor has large starting moment, but has higher failure rate; compared with a brush motor, the brushless motor has the advantages of stable work, low failure rate, silence, power saving and long service life.

The existing fan brushless motor generally comprises a motor bracket, a stator assembly fixed on the motor bracket support shaft, a shaft core penetrating through a hole in the stator assembly and bearings fixed at two ends of the motor bracket shaft hole, wherein the motor bracket comprises a support shaft with a shaft hole; because the bearing is fixed on the inner wall of the shaft hole, the size of the bearing is necessarily smaller for the size requirement, and steel balls in the small-size bearing are easy to wear, and noise is generated after the steel balls are worn, so that the service life of a fan adopting the brushless motor is short, and noise is easy to generate.

Therefore, a brushless fan motor and a fan with a large bearing size, a long service life and less possibility of generating noise are to be designed.

Disclosure of utility model

The utility model aims to overcome the defects and shortcomings of the prior art, and provides a fan brushless motor and a fan, which at least solve one of the technical problems, and have the advantages of larger bearing size, long service life and difficult noise generation.

In order to achieve the above object, the present utility model provides a fan brushless motor, comprising a motor bracket, wherein one end of the motor bracket is provided with a motor support shaft with a shaft hole, and the other end is coaxially provided with a first bearing with the shaft hole;

the brushless motor comprises a stator assembly provided with a motor middle hole, wherein the stator assembly is sleeved on the motor support shaft through the motor middle hole, is fixedly assembled in the motor bracket and penetrates through a shaft core of the shaft hole;

The bearing bracket is fixedly assembled with the motor bracket and/or the stator assembly at one end, and a second bearing is coaxially assembled with the shaft hole at the other end;

The shaft core is rotatably arranged in the motor middle hole through the first bearing and the second bearing; the outer diameters of the first bearing and the second bearing are both larger than the inner diameter of the shaft hole.

Optionally, a first supporting section and a second supporting section with different diameters are formed on the peripheral wall of the motor supporting shaft from bottom to top, and a first step surface is formed at the joint of the first supporting section and the second supporting section; the inner periphery of the motor middle hole is provided with a first middle hole section matched with the first supporting section and a second middle hole section matched with the second supporting section, and a second step surface is formed at the joint of the first middle hole section and the second middle hole section; the second step surface is arranged on the first step surface.

Optionally, a connecting sleeve is arranged at one end of the bearing support, which is fixedly assembled with the motor support and/or the stator assembly, and a third step surface is formed inwards on the connecting sleeve, and is fixedly assembled with the motor support shaft and/or the stator assembly through a fastener.

Optionally, a first part of threaded hole is formed in the outer peripheral wall of the motor support shaft, a corresponding second part of threaded hole is formed in the inner peripheral wall of the stator assembly, and the first part of threaded hole and the second part of threaded hole are relatively attached to each other to form just one threaded hole; the third step surface is provided with a positioning through hole; the bearing support, the brushless motor and the motor support are fixedly assembled through the first part threaded hole, the second part threaded hole, the positioning through hole and the fastening piece.

Optionally, a supporting boss and a vertically arranged positioning column are formed on the inner periphery of the motor supporting shaft; the third step extends downwards to form a positioning sleeve, a positioning groove matched with the positioning column is formed in the inner wall of the positioning sleeve, and the positioning sleeve is inserted into the shaft hole of the motor support shaft and supported by the support boss.

Optionally, a positioning convex ring is formed on the end surface of the stator assembly, which is far away from the motor bracket, and is used for positioning and limiting the connecting sleeve.

Optionally, a damping anti-slip rubber ring is arranged at the fixed connection part of the shaft core and the first bearing, and/or a damping anti-slip rubber ring is arranged at the fixed connection part of the shaft core and the second bearing.

Optionally, the circumferential wall fixedly connected with the shaft core and the first bearing is provided with an annular groove, the damping anti-slip rubber ring part is accommodated in the annular groove, and/or the circumferential wall fixedly connected with the shaft core and the second bearing is provided with an annular groove, and the damping anti-slip rubber ring part is accommodated in the annular groove.

In another aspect, the present utility model provides a fan, including a fan rear housing, a fan blade, and a fan brushless motor as described in any one of the above, wherein a motor bracket of the fan brushless motor is fixedly assembled with the fan rear housing by a fastener, and the fan blade is fixedly assembled with an end of the shaft core, which is close to the second bearing, by the fastener.

Optionally, the fan further comprises a support rod, a head shaking assembly and a clip assembly; the oscillating assembly comprises an oscillating bearing fixing seat fixedly assembled with the clip assembly, and the oscillating bearing fixing seat is provided with a bearing mounting groove and a planet gear inner gear ring; the oscillating bearing is assembled in the bearing mounting groove, and the outer ring of the oscillating bearing is fixedly connected with the bearing mounting groove; the motor installation seat is fixedly connected with the inner ring of the oscillating bearing, the oscillating motor is fixedly arranged at the lower end of the motor installation seat, and an output shaft of the oscillating motor is meshed and connected with the planetary gear ring gear through a planetary gear; one end of the supporting rod is fixedly assembled with the fan rear shell, and the other end of the supporting rod is fixedly assembled with the motor mounting seat.

Compared with the prior art, the application has the advantages that:

Because the first bearing is coaxially arranged on the other side of the motor support relative to the motor support shaft, and the second bearing is coaxially arranged on one side of the bearing support away from the connecting sleeve, the outer diameter of the first bearing and the outer diameter of the second bearing can be larger than the inner diameter of the shaft hole, and bearing steel balls in the large-size bearing are not easy to wear, so that the brushless motor has the advantages of long service life and difficulty in noise generation.

In addition, a first part of threaded hole is formed in the outer peripheral wall of the motor support shaft, a corresponding second part of threaded hole is formed in the inner peripheral wall of the stator assembly, and the first part of threaded hole and the second part of threaded hole are relatively attached to be just one threaded hole; the third step surface is provided with a positioning through hole; the bearing support, the brushless motor and the motor support are fixedly assembled through the first part threaded hole, the second part threaded hole, the positioning through hole and the fastener. Therefore, the motor support, the brushless motor and the bearing support can be fixed in a very small space, so that the whole structure of the fan brushless motor is more compact.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a front view of a brushless fan motor according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of an exploded view of a brushless fan motor according to an embodiment of the utility model;

FIG. 3 is a schematic diagram of an exploded view of a brushless fan motor according to another embodiment of the utility model;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along line B-B in FIG. 3;

FIG. 6 is a schematic view of a bearing support according to an embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view of a bearing support according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram of a brushless motor according to an embodiment of the utility model;

FIG. 9 is a schematic cross-sectional view of a brushless motor according to an embodiment of the utility model;

FIG. 10 is a schematic view of a motor bracket according to an embodiment of the present utility model;

FIG. 11 is a schematic cross-sectional view of a motor bracket according to an embodiment of the present utility model;

FIG. 12 is a schematic diagram of a fan according to an embodiment of the present utility model;

FIG. 13 is a schematic view of another embodiment of a fan according to the present utility model;

fig. 14 is an exploded view of a head assembly according to an embodiment of the present utility model.

Reference numerals illustrate:

1000-fans;

100-fan brushless motor;

1-a motor bracket; a-a motor mounting groove; 11-a motor support shaft; 111-a first support section; 112-a second support section; 113-a first step surface; b-a first partial threaded bore; 12-supporting the boss; 13-positioning columns; c-shaft holes; d-a first bearing groove; e-wire passing holes;

2-brushless motor; a 21-stator assembly; 211-a circuit board; f-a motor middle hole; 22-a first mesoporous section; 23-a second mesoporous section; g-a second partial threaded bore; 24-a second step surface; 25-positioning convex rings; 26-a shaft core; h-an annular groove;

3-bearing support; 31-connecting the sleeve; 311-a third step surface; 32-positioning a sleeve; 321-positioning grooves; 322-positioning through holes; i-a second bearing groove;

4-a first bearing;

5-a second bearing;

6-a screw;

7-a damping anti-skid rubber ring;

8-a fan rear case;

9-fan blades;

300-supporting rods;

400-shaking head assembly; 410-a swing bearing fixing seat; 420-planet wheel inner gear ring; 430-a rocking bearing; 440-motor mount; 450-a shaking motor; 460-planetary gear;

500-clip assembly.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "back", "side", "circumferential", and the like of the present utility model indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Moreover, the terms first, second, etc. are only used to distinguish a plurality of components or structures having the same or similar structure, and do not denote any particular limitation on the arrangement order or connection relationship.

Referring to fig. 1 to 12, an embodiment of the present application provides a fan brushless motor 100, including: motor support 1, brushless motor 2, bearing support 3, first bearing 4 and second bearing 5. Wherein, one end of the motor bracket 1 is provided with a motor mounting groove a and a motor supporting shaft 11 positioned in the motor mounting groove a, and the motor supporting shaft 11 is provided with a shaft hole c; the other end of the motor bracket 1 and the shaft hole c are coaxially provided with a first bearing groove d; in addition, the motor bracket 1 is also provided with a wire passing hole e. The brushless motor 2 comprises a stator assembly 21 and a shaft core 26, wherein the stator assembly 21 is provided with a motor middle hole f, and the stator assembly 21 is sleeved on the motor support shaft 11 through the motor middle hole f and is assembled in a motor mounting groove a; the shaft core 26 is rotatably arranged in the motor middle hole f and penetrates through the shaft hole c; specifically, the stator assembly 21 includes a stator core (not shown in the drawing) and a stator winding (not shown in the drawing) wound around the stator core and a circuit board 211 electrically connected to the stator winding, the circuit board 211 being connected to an external power source through a wire through-hole e in the motor bracket 1 by a wire; the mandrel 26 has a magnetic ring (not shown); the magnetic field of the stator assembly 21 and the shaft core 26 is used for driving the shaft core 26 to rotate and driving the fan blades 9 to rotate; one end of the bearing bracket 3 is provided with a connecting sleeve 31 connected with the motor bracket 1 and/or the stator assembly 21, and the other end is provided with a second bearing groove i; the first bearing 4 is fixedly assembled in the first bearing groove d, and the inner ring of the first bearing is fixedly connected with one end of the shaft core 26; the second bearing 5 is fixedly assembled in the second bearing groove i, and the inner ring of the second bearing 5 is fixedly connected with the other end of the shaft core 26; wherein the outer diameters of the first bearing 4 and the second bearing 5 are both larger than the inner diameter of the shaft hole c.

Thus, since the first bearing groove d is coaxially provided at the other side of the motor support 1 with respect to the motor support shaft 11, and the second bearing groove i is coaxially provided at the side of the bearing support 3 away from the connection sleeve 31, the inner diameters of the first bearing groove d and the second bearing groove i can be set to be larger than the inner diameter of the shaft hole c, and thus a bearing larger than the inner diameter of the shaft hole c can be accommodated. The bearing steel balls in the large-size bearing are not easy to wear, so that the brushless motor 2 has the advantages of long service life and low probability of generating noise.

In order to achieve the fixed assembly of the motor support 1 and the brushless motor 2, referring to fig. 8 to 11, alternatively, in the present embodiment, the outer peripheral wall of the motor support shaft 11 is formed with a first support section 111 and a second support section 112 having different diameters from bottom to top, and a first step surface 113 is formed at the junction of the first support section 111 and the second support section 112, specifically, the outer diameter of the first support section 111 is larger than the outer diameter of the second support section 112; the inner periphery of the motor middle hole f is provided with a first middle hole section 22 matched with the first supporting section 111 and a second middle hole section 23 matched with the second supporting section 112, and a second step surface 24 is formed at the joint of the first middle hole section 22 and the second middle hole section 23; the second step surface 24 is provided on the first step surface 113.

In order to achieve the fixed assembly of the bearing bracket 3, referring to fig. 6 to 9, alternatively, in the present embodiment, the connection sleeve 31 is inwardly formed with a third step surface 311, and the third step surface 311 is fixedly assembled with the motor support shaft 11 and/or the stator assembly 21 by a fastener. Specifically, the third step surface 311 may be fixed to the motor support shaft 11 and/or the stator assembly 21 by a fit of the screw 6 and the screw hole, or a fit of the snap and the snap hole. Specifically, in the present embodiment, the third step surface 311 is fixed to the second support section 112 and/or the stator assembly 21 by a fastener at one end forming the second middle hole section 23.

In order to make the overall structure of the fan brushless motor 100 more compact, referring to fig. 2, 6, 8 and 10, alternatively, in this embodiment, the outer peripheral wall of the motor supporting shaft 11 is provided with a first partial threaded hole b, the inner peripheral wall of the stator assembly 21 is provided with a corresponding second partial threaded hole g, and the first partial threaded hole b and the second partial threaded hole g are relatively attached to be exactly one threaded hole; the third step surface 311 is provided with a positioning through hole 322; bearing support 3, brushless motor 2 and motor support 1 pass through first partial screw hole b, second partial screw hole g, location through-hole 322 and fastener fixed assembly, and optionally, the fastener is screw 6, and preferably, first partial screw hole b and second partial screw hole g are half screw holes, so for the connection is more firm. In this embodiment, four first partial threaded holes b are uniformly spaced on the outer peripheral wall of the motor support shaft 11, and four corresponding second partial threaded holes g are uniformly spaced on the inner peripheral wall of the stator assembly 21. Of course, the number of the first partial screw holes b and the second partial screw holes g is not particularly limited as long as the motor bracket 1, the brushless motor 2, and the bearing bracket 3 can be fixed together in a very small space.

Specifically, in the present embodiment, the outer peripheral wall of the second support section 112 is provided with a first partial threaded hole b, and the inner peripheral wall of the stator assembly 21 forming the second middle hole section 23 is provided with a corresponding second partial threaded hole g, and the first partial threaded hole b and the second partial threaded hole g are relatively fit to be exactly one threaded hole; the third step surface 311 is provided with a positioning through hole 322; the bearing bracket 3, the brushless motor 2 and the motor bracket 1 are fixedly assembled by the first part screw hole b, the second part screw hole g, the positioning through hole 322 and the fastener.

In order to facilitate the assembly connection of the motor support 1 and the bearing support 3, referring to fig. 6 and 10, preferably, the inner circumference of the motor support shaft 11 is formed with a support boss 12 and a vertically arranged positioning column 13; the third step surface 311 extends downward to form a positioning sleeve 32, and a positioning groove 321 matched with the positioning post 13 is formed on the inner wall of the positioning sleeve 32, and the positioning sleeve 32 is inserted into the shaft hole c of the motor support shaft 11 and is supported by the support boss 12.

In order to locate and limit the connecting sleeve 31 of the bearing bracket 3, referring to fig. 8, alternatively, in the present embodiment, a locating convex ring 25 is formed on the end surface of the stator assembly 21 away from the motor bracket 1, and the connecting sleeve 31 may be inserted into the inner peripheral wall of the locating convex ring 25.

In order to facilitate the fixed connection between the shaft core 26 and the bearing and solve the problem of noise caused by the shaft slipping of the shaft core 26, referring to fig. 2, preferably, in this embodiment, a shock-absorbing and anti-slip rubber ring 7 is disposed at the fixed connection between the shaft core 26 and the first bearing 4 and/or a shock-absorbing and anti-slip rubber ring 7 is disposed at the fixed connection between the shaft core 26 and the second bearing 5. Specifically, the circumferential wall fixedly connected between the shaft core 26 and the first bearing 4 is provided with an annular groove h, the shock-absorbing and anti-slip rubber ring 7 is partially accommodated in the annular groove h, and/or the circumferential wall fixedly connected between the shaft core 26 and the second bearing 5 is provided with an annular groove h, and the shock-absorbing and anti-slip rubber ring 7 is partially accommodated in the annular groove h.

Referring to fig. 12, another aspect of the present application provides a fan 1000, which includes a fan rear housing 8, a fan blade 9, and the fan brushless motor 100 as described above, wherein the motor support 1 of the fan brushless motor 100 is fixedly assembled with the fan rear housing 8 through a fastening member, and the fan blade 9 is fixedly assembled with an end of the shaft core 26 near the second bearing 5 through a fastening member. Since the present fan 1000 has all the structures and connection relationships of the fan brushless motor 100, it has all the priority of the fan brushless motor 100, and is not described in detail herein.

In addition, in order to make the fan 1000 have the functions of shaking head and clamping, referring to fig. 13 and 14, optionally, in the present embodiment, the fan 1000 further includes a support rod 300, a shaking head assembly 400 and a clamp assembly 500. Wherein the oscillating assembly 400 includes an oscillating bearing holder 410 fixedly assembled with the clip assembly 500, the oscillating bearing holder 410 having a bearing mounting groove (not shown) and a planet ring gear 420; the oscillating bearing 430 is assembled into the bearing mounting groove, and the outer ring of the oscillating bearing 430 is fixedly connected with the bearing mounting groove; the motor mounting seat 440 is fixedly connected with the inner ring of the oscillating bearing 430; a shaking motor 450 is fixedly arranged at the lower end of the motor mounting seat 440, and an output shaft of the shaking motor 450 is in meshed connection with the planetary gear ring gear 420 through a planetary gear 460; one end of the support rod 300 is fixedly assembled with the fan rear case 8, and the other end of the support rod 300 is fixedly assembled with the motor mount 440.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions.

Claims (10)

1. A fan brushless motor, comprising:

A motor support (1) having a motor support shaft (11) with a shaft hole (c) at one end and a first bearing (4) coaxially fitted to the shaft hole (c) at the other end;

The brushless motor (2) comprises a stator assembly (21) provided with a motor middle hole (f), wherein the stator assembly (21) is sleeved on the motor support shaft (11) through the motor middle hole (f), fixedly assembled in the motor support (1) and a shaft core (26) penetrating through the shaft hole (c);

A bearing bracket (3) which is fixedly assembled with the motor bracket (1) and/or the stator assembly (21) at one end and is coaxially assembled with the shaft hole (c) at the other end with a second bearing (5);

Wherein the shaft core (26) is rotatably arranged in the motor middle hole (f) through the first bearing (4) and the second bearing (5); the outer diameters of the first bearing (4) and the second bearing (5) are both larger than the inner diameter of the shaft hole (c).

2. A fan brushless motor according to claim 1, characterized in that a first support section (111) and a second support section (112) with different diameters are formed on the outer peripheral wall of the motor support shaft (11) from bottom to top, and a first step surface (113) is formed at the connection of the first support section (111) and the second support section (112); the inner periphery of the motor middle hole (f) is provided with a first middle hole section (22) matched with the first supporting section (111) and a second middle hole section (23) matched with the second supporting section (112), and a second step surface (24) is formed at the joint of the first middle hole section (22) and the second middle hole section (23); the second step surface (24) is provided on the first step surface (113).

3. Fan brushless motor according to claim 1, characterized in that the end of the bearing bracket (3) fixedly assembled with the motor bracket (1) and/or the stator assembly (21) is provided with a connecting sleeve (31), the connecting sleeve (31) is inwardly formed with a third step surface (311), and the third step surface (311) is fixedly assembled with the motor support shaft (11) and/or the stator assembly (21) by means of a fastener.

4. A fan brushless motor according to claim 3, characterized in that the outer circumferential wall of the motor support shaft (11) is provided with a first partial threaded hole (b), the inner circumferential wall of the stator assembly (21) is provided with a corresponding second partial threaded hole (g), and the first partial threaded hole (b) and the second partial threaded hole (g) are relatively fitted to be exactly one threaded hole; the third step surface (311) is provided with a positioning through hole (322); the bearing support (3), the brushless motor (2) and the motor support (1) are fixedly assembled through the first part threaded hole (b), the second part threaded hole (g), the positioning through hole (322) and the fastening piece.

5. A fan brushless motor according to claim 4, characterized in that the motor support shaft (11) is formed with a support boss (12) at an inner periphery thereof, and a vertically arranged positioning column (13); the third step surface (311) extends downwards to form a positioning sleeve (32), a positioning groove (321) matched with the positioning column (13) is formed in the inner wall of the positioning sleeve (32), and the positioning sleeve (32) is inserted into the shaft hole (c) of the motor support shaft (11) and supported by the support boss (12).

6. A fan brushless motor as claimed in claim 4, characterized in that the end face of the stator assembly (21) remote from the motor support (1) is formed with a positioning collar (25) for positioning and limiting the connecting sleeve (31).

7. Fan brushless motor according to claim 1, characterized in that the fixed connection of the shaft core (26) and the first bearing (4) is provided with a damping and anti-slip rubber ring (7), and/or the fixed connection of the shaft core (26) and the second bearing (5) is provided with a damping and anti-slip rubber ring (7).

8. Fan brushless motor according to claim 7, characterized in that the circumferential wall of the fixed connection of the shaft core (26) and the first bearing (4) is provided with an annular groove (h), the damping and anti-slip rubber ring (7) is partly accommodated in the annular groove (h), and/or the circumferential wall of the fixed connection of the shaft core (26) and the second bearing (5) is provided with an annular groove (h), the damping and anti-slip rubber ring (7) being partly accommodated in the annular groove (h).

9. A fan, characterized by comprising a fan rear housing (8), a fan blade (9) and a fan brushless motor as claimed in any one of claims 1-8, wherein the motor support (1) of the fan brushless motor is fixedly assembled with the fan rear housing (8) by means of a fastening member, and the fan blade (9) is fixedly assembled with one end of the shaft core (26) close to the second bearing (5) by means of a fastening member.

10. The fan of claim 9, further comprising a support bar (300), a head-shaking assembly (400), and a clip assembly (500); the oscillating assembly (400) comprises an oscillating bearing fixing seat (410) fixedly assembled with the clip assembly (500), and the oscillating bearing fixing seat (410) is provided with a bearing mounting groove and a planet gear inner gear ring (420); a head-shaking bearing (430) fitted into the bearing mounting groove, an outer ring of the head-shaking bearing (430) being fixedly connected with the bearing mounting groove; the motor installation seat (440) is fixedly connected with the inner ring of the oscillating bearing (430), the oscillating motor (450) is fixedly arranged at the lower end of the motor installation seat (440), and an output shaft of the oscillating motor (450) is in meshed connection with the planetary gear ring gear (420) through a planetary gear (460); one end of the supporting rod (300) is fixedly assembled with the fan rear shell (8), and the other end of the supporting rod (300) is fixedly assembled with the motor mounting seat (440).