CN115853820A

CN115853820A - Shaft sleeve assembly of cooling fan, assembly method thereof and cooling fan

Info

Publication number: CN115853820A
Application number: CN202211124186.2A
Authority: CN
Inventors: 文志高; 欧阳定邦; 王娥
Original assignee: Dongguan Zhichen Technology Co ltd
Current assignee: Dongguan Zhichen Technology Co ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-03-28

Abstract

The invention relates to the field of cooling fans, in particular to a shaft sleeve component of a cooling fan, an assembling method thereof and the cooling fan, wherein a first bearing, a first bush, a second bearing and a second bush are sequentially assembled in the shaft sleeve from top to bottom, and an elastic component is assembled between a limiting step and the first bearing or between the first bearing and the first bush or between the first bush and the second bearing or between the second bearing and the second bush. The shaft sleeve completes inner diameter machining through one-time feeding without secondary clamping, and can be directly installed according to the first bearing and the second bearing through the tail end of the shaft sleeve, the machining cost of the shaft sleeve can be reduced to the maximum extent through the change, and meanwhile, the flexible and mechanical manufacturing process ensures the precision of a product, improves the expected service life of the product and maximizes the reliability of the product; the continuous processing and manufacturing difficulty of the product is greatly solved through a brand new structure design, and the reliability of the product is greatly improved while the cost is maintained or even reduced.

Description

Shaft sleeve assembly of cooling fan, assembly method thereof and cooling fan

Technical Field

The present invention relates to the field of heat dissipation fans, and particularly to a shaft sleeve assembly of a heat dissipation fan, an assembly method thereof, and a heat dissipation fan thereof.

Background

The brushless DC motor is a typical electromechanical integration product, because the brushless DC motor runs in a self-control mode, a starting winding is not additionally arranged on a rotor like a synchronous motor which is started under the condition of heavy load under the condition of variable frequency speed regulation, and oscillation and desynchronization are not generated when the load suddenly changes, so that the brushless DC motor is rapidly developed along with the gradual maturity and perfection of the technology.

In current various devices, because the brushless motor has the characteristics of high rotating speed and high stability, the brushless motor is generally adopted to drive a cooling fan for cooling various devices; particularly, in the relatively high-end fields of various new energy sources emerging in recent years, such as charging piles, photovoltaics, communication servers and the like, because the severe working environment and the high integration of the fan per se have extremely high requirements on the heat dissipation fan, the fan is required to ensure continuous operation without failure for 10 ten thousand hours or even longer at the rotating speed of tens of thousands of revolutions, the high-end fields emerging at present are basically supported by stable and reliable rotation under the condition of extremely high revolution by the Germany system, the Japanese system and the Taiwan system fan factories are almost completely monopolized, the domestic factories continuously strive continuously, but the traditional structure of the foreign factories is difficult to realize complete localization and maintain the reliability, the difficulty is that the foreign factories generally adopt high-precision automatic machine tool machining in Japan, the precision machine tools of the types are controlled by the Japanese export, the machined products are sold to the domestic fan factories at extremely high unit price, and the precision of the machine tools generally adopted by the domestic factories is difficult to achieve, so that the fan shaft assembly in the existing heat dissipation fan has the following problems:

1. referring to fig. 1-2, a shaft sleeve in the prior art generally adopts two-end cutting processing to form a corresponding bearing slot (i.e., one end is processed and then another end is clamped for processing), then a bearing is assembled in the corresponding bearing slot from two ends, because the bearing slots at two ends are respectively in a two-end cutting processing mode, the concentricity of the bearing slots at two ends is difficult to guarantee (the precision of each time of disassembling and clamping is affected), the concentricity cannot be guaranteed, a fan generates abnormal sound or shakes in the working process, and in addition, the structure of a conventional shaft sleeve leads to the need of turning the shaft sleeve to assemble the bearing, and the assembly difficulty is complex.

2. In addition, in a conventional shaft sleeve assembly, the rotating speed of the brushless motor can reach several ten thousand revolutions per minute, when the fan runs at a high speed for a long time, the outer ring of the bearing and the inner wall of the shaft sleeve move relatively, so that metal chips are generated by the rotation of the outer wall of the bearing and the friction of the inner wall of the shaft sleeve, the metal chips enter the bearing to cause the clamping of the bearing, the fan does not rotate, the function fails, and serious accidents of customer equipment are caused.

2.1 in order to solve above-mentioned second problem, go into the axle sleeve through tight fit (interference fit) of bearing among the prior art, but this method need keep the absolute level of keeping in the dress process of dress of bearing, but this dress degree of difficulty is big, if the bearing does not put right, cause the bearing to damage and produce abnormal sound after the axle sleeve of impressing by force, so whole dress degree of difficulty is great and more loaded down with trivial details

2.2 in order to solve the second problem, the bearing can be installed after the glue is applied to the inner wall of the shaft sleeve in the prior art, but in the method, the glue application amount is not well controlled, the glue is easy to seep into the bearing after the bearing is installed, and the bearing is locked after the glue is dried, so that the fan does not rotate.

Therefore, the inventor aims to design a shaft sleeve assembly of a heat dissipation fan and an assembling method thereof to break through the above core rotation supporting problem of the neck on the localization road of the high-end high-performance heat dissipation fan.

Disclosure of Invention

In order to solve the problems, the invention provides a shaft sleeve assembly of a cooling fan, an assembly method thereof and the cooling fan thereof, which can well ensure that a bearing outer ring and a shaft sleeve inner wall do not move relatively when the fan runs at a high speed, thereby avoiding metal debris generated by the rotation of a bearing outer wall and the friction of the shaft sleeve inner wall, and the metal debris enters the bearing to cause the bearing to be blocked, the fan does not rotate, the function fails and serious accidents of a client are caused.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a radiator fan axle sleeve subassembly which characterized in that: the bearing comprises a shaft sleeve, a first bearing, a second bearing, an elastic component, a first bush and a second bush, wherein a circle of limiting steps are arranged inwards at the edge of the upper end of the shaft sleeve, and the first bearing, the first bush, the second bearing and the second bush are sequentially assembled in the shaft sleeve from top to bottom, wherein the elastic component is assembled between the limiting steps and the first bearing or between the first bearing and the first bush or between the first bush and the second bearing or between the second bearing and the second bush.

Further, the elastic component is a wave washer.

Further, the wave washer is arranged between the limiting step and the first bearing, and the first bearing is tightly pressed with the first bushing under the action of the wave washer.

Further, the lateral surface of axle sleeve sets up from top to bottom and has seted up a plurality of circles and store up gluey groove.

Furthermore, the inner wall of the end, close to the second bush, of the shaft sleeve is provided with a step-shaped limiting boss, a circle of clamping boss is convexly arranged on the outer side wall of the second bush, the second bush is assembled in the shaft sleeve, and the clamping boss of the second bush abuts against the limiting boss to achieve limiting.

Furthermore, a yielding hole is formed in the center of the limiting step, and the aperture of the yielding hole is smaller than the outer diameter of the first bearing.

Furthermore, let out hole, wave washer, first bearing, first bush, second bearing, second bush and be coaxial setting.

The application also provides an assembling method of the shaft sleeve component of the heat dissipation fan, which comprises the following steps: the first bearing, the second bearing, the elastic component, the first bushing and the second bushing are all arranged in the shaft sleeve from the bottom of the shaft sleeve according to a preset sequence and are fastened tightly;

the elastic assembly, the first bearing, the first bushing, the second bearing and the second bushing are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in a preset sequence; or a first bearing, an elastic component, a first bush, a second bearing and a second bush are arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in sequence; or a first bearing, a first bush, an elastic component, a second bearing and a second bush are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve; or a first bearing, a first bush, a second bearing, an elastic component and a second bush are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve.

The application also provides a cooling fan, which comprises a shell, a stator component, a rotor component, a shaft core, fan blades and a cooling fan shaft sleeve component, wherein the stator component and the cooling fan shaft sleeve component are both arranged on the shell, the shaft sleeve is positioned at the center of the stator component, and the fan blades are assembled on the surface of the rotor component; wherein the shaft core sequentially penetrates through the wave washer, the first bearing, the first bush, the second bearing and the second bush from top to bottom.

Further, the rotor subassembly includes that the cover establishes the motor shell, the rotor magnet of interval distribution at the motor shell inner wall, fixes the axle core seat of motor shell diapire center department at the lateral surface of stator module, wherein the tip and the axle core seat fixed connection of axle core.

Further, the rotor subassembly still includes pre-compaction spring, and this pre-compaction spring cover is established on the axle center, and the both ends of pre-compaction spring are supported respectively and are stopped on the inner race of axle center seat and first bearing.

Furthermore, a limit gap is reserved between the shaft core seat and a limit step of the shaft sleeve, and the distance of the limit gap is smaller than the maximum compression amount of the pre-pressing spring.

Furthermore, the end of the shaft core close to the second bearing is provided with a retaining ring which is abutted against the bottom surface of the second bearing.

The invention has the beneficial effects that:

1. the axle sleeve in this application, accomplish the internal diameter processing through once the feed, need not the secondary clamping, ensure the concentricity of front and back first bearing and second bearing, and now can be according to the wave form packing ring, first bearing, first bush, the second bearing, the second bush, or first bearing, the wave form packing ring, first bush, the second bearing, the second bush, or first bearing, first bush, the wave form packing ring, the second bearing, the second bush, or first bearing again, first bush, the second bearing, the wave form packing ring, the order of second bush will correspond the direct tail end of axle sleeve of part and pack into, the common point of foretell several kinds of assembly methods is by the bottom installation of axle sleeve, can realize the preassembly of whole axle sleeve subassembly, when having avoided traditional assembly, need from axle sleeve both ends assembly bearing, also avoided needing to overturn the axle sleeve in the assembly process and realize the assembly of bearing, the event is assembled more portably.

2. In the application, a wave washer is preassembled above a first bearing, a second bearing at the bottom is supported and pressed by a second bushing, the stressed elastic wave washer forms axial pre-pressure on the outer ring of the first bearing, namely, the wave washer and the first bushing realize pre-pressure fixation on the outer ring of the first bearing, and the first bushing and the second bushing realize pre-pressure fixation on the outer ring of the second bearing (the axial pre-pressure of the wave washer is also transmitted to the first bushing through the outer ring of the first bearing and then acts on the outer ring of the second bearing and the second bushing in sequence); the event can be fine guarantees that bearing outer lane and axle sleeve inner wall do not do relative motion when the high-speed operation of fan to avoid bearing outer wall rotation and axle sleeve inner wall friction to produce the metal piece, cause the bearing card to die after the metal piece gets into the bearing, the fan does not change, and the functional failure leads to the serious accident of customer end.

3. Compared with the prior art, the method and the device have the advantages that the process procedure and the shaft sleeve design are updated, the processing cost of the shaft sleeve can be reduced to the maximum extent by the change, meanwhile, the flexible and mobile procedure ensures the precision of the product, prolongs the expected service life of the product, and realizes the maximization of the reliability of the product; the continuous processing and manufacturing difficulty of the product is greatly solved through a brand new structure design, and the reliability of the product is greatly improved while the cost is maintained or even reduced.

Drawings

Fig. 1 is a schematic view of the feed machining principle of two ends of a shaft sleeve in the prior art.

Fig. 2 is a schematic view of the prior art shaft sleeve with bearings at both ends.

FIG. 3 is a cross-sectional structural schematic view of the bushing assembly of the present application.

Fig. 4 is a schematic sectional view of the sleeve of the present application.

Fig. 5 is a schematic cross-sectional view of a cooling fan according to the present application.

FIG. 6 is a graph showing the results of a prior art test

Fig. 7 is a graph showing the test results of the present application.

The reference numbers indicate: the structure comprises a shaft sleeve 1, a wave washer 2, a first bearing 3, a first bush 4, a second bearing 5, a second bush 6, a clamping boss 61, a shaft core 7, a retaining ring 8, a pre-pressing spring 9, a shaft core seat 10, a limiting boss 11, a glue storage groove 12, a limiting step 13, an escape hole 14, a limiting gap 101, a shell 21, fan blades 22, a motor shell 23, a stator assembly 24 and a rotor magnet 25.

Detailed Description

Referring to fig. 1-7, the present invention relates to a shaft sleeve assembly of a heat dissipation fan, including a shaft sleeve 1, a first bearing 3, a second bearing 5, an elastic assembly, a first bushing 4, and a second bushing 6, wherein a circle of limiting step 13 is inward arranged at the edge of the upper end of the shaft sleeve 1, and the first bearing 3, the first bushing 4, the second bearing 5, and the second bushing 6 are sequentially assembled in the shaft sleeve 1 from top to bottom, wherein the elastic assembly is assembled between the limiting step 13 and the first bearing 3, or between the first bearing 3 and the first bushing 4, or between the first bushing 4 and the second bearing 5, or between the second bearing 5 and the second bushing 6. In this embodiment, the elastic component is preferably a wave washer 2, and the wave washer 2 is preferably disposed between the limit step 13 and the first bearing 3, and the first bearing 3 is pressed against the first bushing by the wave washer 2.

The shaft sleeve 1 in the application completes inner diameter machining through once feeding, secondary clamping is not needed, the concentricity of the front and rear first bearings 3 and the second bearings 5 is ensured, and the first bearings 2, the first bearings 3, the first bushings 4, the second bearings 5 and the second bushings 6 can be arranged at present, or the first bearings 3, the wave washers 2, the first bushings 4, the second bearings 5 and the second bushings 6, or the first bearings 3, the first bushings 4, the wave washers 2, the second bearings 5 and the second bushings 6, or the first bearings 3, the first bushings 4, the second bearings 5, the wave washers 2 and the second bushings 6 are arranged in sequence to enable corresponding parts to be directly arranged in the tail end of the shaft sleeve, so that the bottom of the shaft sleeve is installed at the common point positions of the above assembling modes, pre-assembling of the whole shaft sleeve assembly can be realized, when the traditional assembling is avoided, the bearings are required to be assembled at two ends of the shaft sleeve, and the assembling of the bearings is also avoided to be realized by overturning in the assembling process, so that the assembling is simpler and more convenient.

Compared with the prior art, the method has the advantages that the process procedure and the design of the shaft sleeve 1 are updated, the processing cost of the shaft sleeve 1 can be reduced to the maximum extent by the change, meanwhile, the flexible procedure ensures the precision of the product, prolongs the expected service life of the product, and the maximization of the reliability of the product is realized; the continuous processing and manufacturing difficulty of the product is greatly solved through a brand new structure design, and the reliability of the product is greatly improved while the cost is maintained or even reduced.

In this embodiment, the wave washer 2, the first bearing 3, the first bush 4, the second bearing 5, and the second bush 6 are assembled inside the bearing from the bottom of the bearing.

In this embodiment, the wave washer 2 is pre-installed above the first bearing 3, the second bearing 5 at the bottom is supported and pressed by the second bushing 6, the stressed elastic wave washer 2 forms axial pre-pressure on the outer ring of the first bearing 3, that is, the wave washer 2 and the first bushing 4 realize pre-pressure fixation on the outer ring of the first bearing 3, and the first bushing 4 and the second bushing 6 realize pre-pressure fixation on the outer ring of the second bearing 5 (the axial pre-pressure of the wave washer 2 is also transmitted to the first bushing 4 through the outer ring of the first bearing 3, and then acts on the outer ring of the second bearing 5 and the second bushing 6 in sequence); the event can be fine guarantee that first bearing 3 and second bearing 5 do not do relative motion with 1 inner wall of axle sleeve when the fan is high-speed to avoid bearing outer wall rotation and the friction of 1 inner wall of axle sleeve to produce the metal piece, cause the bearing card to die after the metal piece gets into the bearing, the fan does not rotate, and the function is lost efficacy, leads to the serious accident of customer end.

Further, the lateral surface of axle sleeve 1 has set up from top to bottom and has seted up a plurality of circles and has stored up gluey groove 12, because axle sleeve 1 in this embodiment is the subsequent meeting with stator module 24 equipment, in order to fix stator module 24 on axle sleeve 1, so generally realize through the mode of gluing, and seted up a plurality of circles in this embodiment and store up gluey groove 12, can increase the storage capacity of glue, can increase axle sleeve 1 and stator module 24's area of contact simultaneously, improve the stability of both connections.

Furthermore, the inner wall of one end of the shaft sleeve 1 close to the second bushing 6 is provided with a step-shaped limiting boss 11, and the outer side wall of the second bushing 6 is convexly provided with a circle of clamping boss 61, wherein the second bushing 6 is assembled in the shaft sleeve 1, and the clamping boss 61 of the second bushing 6 abuts against the limiting boss 11 to realize limiting, so as to avoid the second bushing 6 from being excessively pressed in to damage the first bearing 3, the second bearing 5 and the wave-shaped gasket 2, so that the clamping boss 61 and the limiting boss 11 abut against and realize limiting through the second bushing 6, and when the assembly is completed, sealant can be filled between the outer side wall of the lower section of the clamping boss 61 and the inner side wall of the lower section of the limiting boss 11 to achieve the dustproof and waterproof effects.

Further, a yielding hole 14 is formed in the center of the limiting step 13, and the aperture of the yielding hole 14 is smaller than the outer diameter of the first bearing 3. The hole 14 is designed to allow the shaft core 7 to pass through, and the diameter of the hole 14 is smaller than the outer diameter of the first bearing 3, so that the first bearing 3 is prevented from falling out of the hole 14. Furthermore, the hole 14, the wave washer 2, the first bearing 3, the first bush 4, the second bearing 5 and the second bush 6 are coaxially arranged.

The application also provides an assembling method of the shaft sleeve component of the heat dissipation fan, which comprises the following steps: the first bearing, the second bearing, the elastic component, the first bushing and the second bushing are all rotated into the shaft sleeve from the bottom of the shaft sleeve according to a preset sequence and are fastened; wherein the elastic component, the first bearing, the first bushing, the second bearing and the second bushing are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in a preset sequence; or a first bearing, an elastic component, a first bush, a second bearing and a second bush are arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in sequence; or a first bearing, a first bush, an elastic component, a second bearing and a second bush are arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in sequence; or a first bearing, a first bush, a second bearing, an elastic component and a second bush are arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in sequence.

In the embodiment, an elastic component (a wave washer), a first bearing, a first bushing, a second bearing and a second bushing are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve.

In a specific embodiment, the improved heat dissipation fan shaft sleeve 1 assembly of the present application is applied to a heat dissipation fan, wherein the heat dissipation fan comprises a housing 21, a stator assembly 24, a rotor assembly, a shaft core 7, fan blades 22, and the heat dissipation fan shaft sleeve 1 assembly, wherein the stator assembly 24 (the stator assembly 24 of a conventional brushless motor) and the heat dissipation fan shaft sleeve 1 assembly are both mounted on the housing 21, and the heat dissipation fan shaft sleeve 1 assembly shaft sleeve 1 is located at the center of the stator assembly 24, and the fan blades 22 are assembled on the surface of the rotor assembly, wherein the rotor assembly is movably assembled in the shaft sleeve 1 through the shaft core 7; the shaft core 7 sequentially penetrates through the wave washer 2, the first bearing 3, the first bush 4, the second bearing 5 and the second bush 6 from top to bottom.

Further, the rotor assembly comprises a motor shell 23 sleeved on the outer side surface of the stator assembly 24, rotor magnets 25 distributed on the inner wall of the motor shell 23 at intervals, and a shaft core seat 10 fixed at the center of the bottom wall of the motor shell 23, wherein the end part of the shaft core 7 is fixedly connected with the shaft core seat 10. Further, the rotor assembly further comprises a pre-pressing spring 9, the pre-pressing spring 9 is sleeved on the shaft core 7, and two ends of the pre-pressing spring 9 respectively abut against the inner ring of the shaft core seat 10 and the inner ring of the first bearing 3.

Further, a limit gap 101 is reserved between the shaft core seat 10 and the limit step 13 of the shaft sleeve 1, and the distance of the limit gap 101 is smaller than the maximum compression amount of the pre-pressing spring 9. Spacing clearance 101 is reserved with axle sleeve 1 to axle core seat 10, and the simulation fan falls from the eminence, and prevention flabellum 22 combination is under the effect of falling back inertia axle core seat 10 directly through pre-compaction spring 9 striking first bearing 3 inner circle to cause the 3 ball injuries of first bearing and produce the abnormal sound. After the design of the limit gap 101, the axle center seat 10 directly collides with the axle sleeve 1 after falling, and the inner ring of the first bearing 3 and the axle center seat 10 are buffered by the pre-pressing spring 9, so that the impact force of the inner ring of the bearing is reduced to a great extent.

Further, the end of the shaft core 7 near the second bearing 5 is fitted with a snap ring 8, and the snap ring 8 abuts against the bottom surface of the second bearing 5. In order to prevent the shaft core 7 from being separated from the shaft sleeve 1 in the operation process of the fan, a retaining ring 8 is assembled on a fixing groove at the tail end of the shaft core 7.

The following test reports prove the performance of the cooling fan of the present application:

1. and (3) testing items: reliability behind high-temperature baking machine of patent structure

1.1 test item conditions: the 10 groups of patented fans with new structures are tested after continuously working for 30 days at 90 ℃.

1.2 test results:

1.3 test results (see fig. 7): the patent structure 90 ℃ accelerated life test, each item of test data of the finished product are all OK as a result, the fan is disassembled to see that the internal parts are all normal, especially the most important bearing system is abnormal-free, the normal operation of the fan is ensured without functional failure, and the patent structure design product has higher reliability.

1.4 comparison of the test results of conventional equipment (see FIG. 6), the abnormality occurred before the old structure, which finally appeared as a dead halt of the product, no rotation, failure of the basic function of the fan, and highest severity level.

2. And (3) testing items: reliability of fall of proprietary structure

2.1 drop test conditions: the 1# to 10# conventional fan is dropped from a 1-meter high altitude, the noise change before and after dropping is tested, and the 11# to 20# cooling fan device is dropped from a 1.5-meter high altitude, and the noise before and after dropping is tested.

Drop test results are given in the following table:

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from the above table, it can be seen that: the conventional cooling fan (1 # -10 #) and the cooling fan (11 # -20 #) of the invention have little noise change before and after falling off and can also normally operate, but the conventional fan is accompanied by noise, the cooling fan of the invention has no abnormal sound, and the falling resistance of the cooling fan of the invention is obviously better than that of the conventional fan.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.

Claims

1. The utility model provides a radiating fan axle sleeve subassembly which characterized in that: the bearing comprises a shaft sleeve, a first bearing, a second bearing, an elastic component, a first bush and a second bush, wherein a circle of limiting steps are arranged inwards at the edge of the upper end of the shaft sleeve, and the first bearing, the first bush, the second bearing and the second bush are sequentially assembled in the shaft sleeve from top to bottom, wherein the elastic component is assembled between the limiting steps and the first bearing or between the first bearing and the first bush or between the first bush and the second bearing or between the second bearing and the second bush.

2. The cooling fan shaft sleeve assembly according to claim 1, wherein: the elastic component is a wave washer.

3. The heat dissipating fan boss assembly according to claim 2, wherein: the wave washer is arranged between the limiting step and the first bearing, and the first bearing is tightly pressed with the first bushing under the action of the wave washer.

4. The cooling fan shaft sleeve assembly according to claim 3, wherein: the inner wall of one end, close to the second bush, of the shaft sleeve is provided with a step-shaped limiting boss, a circle of clamping boss is convexly arranged on the outer side wall of the second bush, the second bush is assembled in the shaft sleeve, and the clamping boss of the second bush abuts against the limiting boss to achieve limiting.

5. A method of assembling a radiator fan boss assembly according to claim 1, comprising the steps of: the first bearing, the second bearing, the elastic component, the first bushing and the second bushing are all arranged in the shaft sleeve from the bottom of the shaft sleeve according to a preset sequence and are fastened tightly;

wherein the elastic component, the first bearing, the first bushing, the second bearing and the second bushing are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in a preset sequence; or a first bearing, an elastic component, a first bush, a second bearing and a second bush are arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve in sequence; or a first bearing, a first bush, an elastic component, a second bearing and a second bush are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve; or a first bearing, a first bush, a second bearing, an elastic component and a second bush are sequentially arranged from the upper end of the shaft sleeve to the lower end of the shaft sleeve.

6. A kind of heat-dissipating fan, characterized by: the shaft sleeve of the cooling fan is positioned at the center of the stator component, and the fan blades are assembled on the surface of the rotor component, wherein the rotor component is movably assembled in the shaft sleeve through the shaft core; wherein the axle core passes wave washer, first bearing, first bush, second bearing, second bush from top to bottom in proper order.

7. The heat dissipating fan as claimed in claim 6, wherein: the rotor subassembly is including the motor shell, the rotor magnet of interval distribution at the motor shell inner wall, fixing the axle center seat of motor shell diapire center department of establishing at the lateral surface of stator module, wherein the tip and the axle center seat fixed connection of axle core.

8. The heat dissipating fan as claimed in claim 7, wherein: the rotor assembly further comprises a pre-pressing spring, the pre-pressing spring is sleeved on the shaft core, and two ends of the pre-pressing spring are respectively abutted to the inner ring of the shaft core seat and the inner ring of the first bearing.

9. The heat dissipating fan as claimed in claim 8, wherein: a limiting gap is reserved between the shaft core seat and the limiting step of the shaft sleeve, and the distance of the limiting gap is smaller than the maximum compression amount of the pre-pressing spring.

10. The heat dissipating fan according to claim 9, wherein: the end of the shaft core close to the second bearing is provided with a retaining ring which is abutted against the bottom surface of the second bearing.