CN116044792A

CN116044792A - Brushless fan with self-adaptation regulatory function

Info

Publication number: CN116044792A
Application number: CN202310212435.1A
Authority: CN
Inventors: 杨浩
Original assignee: Hunan Dongni Automobile Parts Co ltd
Current assignee: Hunan Dongni Automobile Parts Co ltd
Priority date: 2023-03-07
Filing date: 2023-03-07
Publication date: 2023-05-02

Abstract

The invention relates to the field of ventilation equipment for an automobile air conditioning system, in particular to a brushless fan with a self-adaptive regulation function, which comprises a shell fixed on the inner wall of a pipeline through a bracket I, wherein a stator and a chip are fixed on the inner side wall of the shell, a rotor is coaxially arranged on the inner side of the stator, the rotor is coaxially and fixedly connected with a rotating shaft, one end of the rotating shaft extends to the outer side of the shell, a fan blade component capable of self-adaptively regulating an angle is arranged at one end of the rotating shaft, which is positioned at the outer side of the shell, a heat dissipation component used for dissipating heat of the chip is arranged on the shell, and a dust removal mechanism used for purifying air entering the shell is arranged on the heat dissipation component. This kind of brushless fan with self-adaptation regulatory function through setting up the fan blade subassembly that can self-adaptation angle of adjustment, realizes the installation angle of the blade that the automatic regulation was suited when adjusting the amount of wind through the output of adjusting brushless fan to increase brushless fan's air regulation efficiency, and then improve the sensitivity that air conditioning system air regulation of car.

Description

Brushless fan with self-adaptation regulatory function

Technical Field

The invention relates to the field of ventilation equipment for an automobile air conditioning system, in particular to a brushless fan with a self-adaptive adjusting function.

Background

The brushless fan is usually used in an air conditioning system of an automobile to input or output air to the space in the automobile, when the air quantity is required to be adjusted, the air quantity is adjusted by only singly adjusting the output power of the brushless fan, so that the air quantity adjusting efficiency is lower, a chip in the brushless fan can generate larger heat in the working process, if the chip is not timely cooled, the chip is burnt out, and therefore the brushless fan cannot work normally.

Disclosure of Invention

The invention aims to provide a brushless fan with a self-adaptive adjusting function, so as to solve the problems in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a brushless fan with self-adaptation regulatory function, include through a support casing of fixing on the pipeline inner wall, the casing inside wall is fixed with stator and chip, and the inboard coaxial rotor that is provided with of stator, the coaxial fixed connection pivot of rotor, the one end of pivot is overhanging to the casing outside, and the one end that the pivot is located the casing outside is provided with the fan blade subassembly that can self-adaptation angle of regulation, be provided with on the casing and be used for the radiating subassembly of chip, and be provided with on the radiating subassembly and be used for entering the inside air purification's of casing dust removal mechanism.

Preferably, the fan blade assembly comprises a rotary table coaxially fixed at one end part of the rotary shaft outside the casing, a plurality of grooves are formed in the rotary table at positions far away from the circle center, the grooves are arranged at equal intervals along the circumferential direction of the rotary table, a gear is fixedly connected in the grooves in a rotating manner, a shaft lever II is coaxially and fixedly connected to the gear, the shaft lever II is perpendicular to the rotary shaft, the shaft lever II penetrates through and is fixedly connected to the side wall of the groove in a rotating manner, and one end of the shaft lever II far away from the gear is fixedly connected with a blade.

Preferably, one end of the blade, which is far away from the second shaft lever, is fixedly connected with the first shaft lever, the first shaft lever and the second shaft lever share a central axis, one end of the first shaft lever, which is far away from the blade, is fixedly connected to the inner side wall of the ring frame in a rotating way, and the ring frame is fixedly connected to the inner wall of the pipeline in a rotating way.

Preferably, the shaft sleeve is sleeved on a section of the rotating shaft between the shell and the turntable and is in sliding connection with the shaft sleeve, the first convex ring and the second convex ring are respectively fixed at two ends of the shaft sleeve, a plurality of racks which are in one-to-one correspondence with the grooves are fixed on the second convex ring, and the racks are in meshed connection with the gears in the corresponding grooves.

Preferably, a first circular plate is coaxially fixed on a section of the rotating shaft between the shell and the shaft sleeve, the shaft sleeve is connected with the first circular plate through a spring, a balancing weight is arranged between the first convex ring and the first circular plate, and the balancing weight is hinged with the first convex ring and the first circular plate through two connecting rods respectively.

Preferably, the heat dissipation assembly comprises a heat dissipation disc which is arranged inside the shell and used for dissipating heat of the chip, the heat dissipation disc is coaxially fixed on the rotating shaft, the heat dissipation disc is buckled on a positioning groove formed in the rotor, a heat dissipation fin is fixed on the heat dissipation disc, the shell is provided with a first air inlet hole and a first air outlet hole, and the first air inlet hole and the first air outlet hole are respectively positioned on two sides of the chip.

Preferably, the outer side wall of the shell is sleeved with and slidably connected with a sealing cylinder, the sealing cylinder can simultaneously seal the first air inlet hole and the first air outlet hole, the sealing cylinder is provided with the second air inlet hole and the second air outlet hole, the second air inlet hole is completely identical to and corresponds to the first air inlet hole, the second air outlet hole is completely identical to and corresponds to the first air outlet hole, and the first air inlet hole is communicated with the second air inlet hole while the first air outlet hole is communicated with the second air outlet hole.

Preferably, the shaft sleeve is sleeved with and fixed with a shaft rotating connecting sleeve, the sleeve is positioned between the first convex ring and the second convex ring, the sleeve is fixedly provided with a second convex rod, the second convex rod is fixedly connected with the first convex rod through a first connecting rod, and the first convex rod is fixedly connected with the sealing cylinder.

Preferably, the dust removing mechanism comprises an air inlet pipe fixed at the two ports of the air inlet hole and an air outlet pipe fixed at the two ports of the air outlet hole, and a filter screen is fixed at one end of the air inlet pipe, which is far away from the second air inlet hole.

Preferably, a pump wheel which corresponds to and is communicated with the air outlet pipe is fixed on the sealing cylinder, a circular plate II is arranged on the outer end wall of the pump wheel, and the circular plate II is coaxially and fixedly connected with an impeller inside the pump wheel.

Preferably, a second bracket corresponding to the pump wheel is fixed on the sealing cylinder, a sliding rod is connected to the second bracket in a sliding manner, a sliding frame and a brush head are respectively fixed at two ends of the sliding rod, a pin rod is fixed at a position, far away from the center of a circle, on the second circular plate, the pin rod is inserted and can slide on a strip-shaped through groove formed in the sliding frame, and the brush head is used for cleaning dust on the surface of the filter screen.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, by arranging the fan blade assembly capable of adaptively adjusting the angle, the installation angle of the corresponding blade is automatically adjusted while the air quantity is adjusted by adjusting the output power of the brushless fan, so that the air quantity adjusting efficiency of the brushless fan is increased, and the air quantity adjusting sensitivity of an air conditioning system of an automobile is further improved.

According to the invention, the brushless fan is used for conveying air quantity and simultaneously driving the heat radiating assembly to radiate heat to the chip, so that damage caused by overhigh temperature of the chip is avoided, the service life of the brushless fan is prolonged, the fan blade assembly is used for driving the sealing cylinder to increase the communication area between the air inlet hole II and the air inlet hole I and between the air outlet hole II and the air outlet hole I, and the air flow quantity is improved, so that when the brushless fan works under high load, the cooling effect on the chip is correspondingly improved, when the brushless fan stops and does not work, the sealing cylinder simultaneously seals the air outlet hole I and the air inlet hole I, so that damage to internal components caused by external dust entering the machine shell is avoided, and the dustproof function is realized when the brushless fan does not work.

According to the invention, the heat radiation assembly radiates heat to the chip and simultaneously purifies and removes dust and impurities in the air by the air in the dust removal mechanism, so that when the brushless fan works, external dust is prevented from entering the inside of the casing to damage internal components, the service life of the brushless fan is prolonged, the air flow output from the air outlet pipe drives the dust removal mechanism to clean and brush the outer surface of the filter screen to remove dust and impurities on the filter screen, the filter screen is prevented from being blocked, the efficient filtering effect of the filter screen is ensured, the blockage is prevented from being unsmooth, and the cooling effect of the chip is further ensured.

Drawings

FIG. 1 is a schematic view of the sectional structure of the assembly of the present invention;

FIG. 2 is a schematic cross-sectional view of the turntable of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the housing of FIG. 1;

fig. 4 is an enlarged schematic view of the structure at a in fig. 3.

In the figure: 1. a rotating shaft; 2. a first convex rod; 3. a first connecting rod; 4. a spring; 5. balancing weight; 6. a second protruding rod; 7. a shaft sleeve; 8. a chip; 9. a heat dissipation plate; 10. a rotor; 11. a housing; 12. a first bracket; 13. a circular plate I; 14. a second connecting rod; 15. a convex ring I; 16. a sleeve; 17. a convex ring II; 18. a rack; 19. a ring frame; 20. a first shaft lever; 21. a blade; 22. a second shaft lever; 23. a turntable; 24. a groove; 25. a gear; 26. a circular plate II; 27. a positioning groove; 28. a heat sink; 29. sealing the cylinder; 30. an air outlet pipe; 31. a pump wheel; 32. a second bracket; 33. a slide bar; 34. a filter screen; 35. a brush head; 36. an air outlet hole I; 37. an air outlet hole II; 38. an air inlet hole I; 39. an air inlet II; 40. an air inlet pipe; 41. a pin rod; 42. and a carriage.

Detailed Description

The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which are obtained by a worker of ordinary skill in the art without creative efforts, are within the protection scope of the present invention based on the embodiments of the present invention.

Referring to fig. 1 to 4, the present invention provides a technical solution: the utility model provides a brushless fan with self-adaptation regulatory function, include the casing 11 of fixing on the pipeline inner wall through support one 12, casing 11 inside wall is fixed with stator and chip 8, and the inboard coaxial rotor 10 that is provided with of stator, the coaxial fixed connection pivot 1 of rotor 10, the overhanging to the casing 11 outside of one end of pivot 1, and the one end that pivot 1 is located the casing 11 outside is provided with the fan blade subassembly that can self-adaptation angle of regulation, be provided with on the casing 11 and be used for the radiating subassembly of chip 8, and be provided with on the radiating subassembly and be used for entering the inside air purification's of casing 11 dust removal mechanism.

In this embodiment, the fan blade assembly includes a turntable 23 coaxially fixed at an end portion of the rotating shaft 1 located outside the casing 11, a plurality of grooves 24 are formed in a position, away from the center of a circle, on the turntable 23, and a plurality of grooves 24 are arranged at equal intervals along a circumferential direction of the turntable 23, gears 25 are rotatably connected in the grooves 24, a second shaft 22 is coaxially and fixedly connected to the gears 25, the second shaft 22 is perpendicular to the rotating shaft 1, the second shaft 22 penetrates through and is fixedly connected to a side wall of the grooves 24, the second shaft 22 is fixedly connected to a blade 21 at an end, away from the gears 25, of the first shaft 21, one end, away from the second shaft 22, of the first shaft 20 is fixedly connected to a first shaft 20, the second shaft 22 shares a central axis, one end, away from the first shaft 20, of the first shaft 21 is fixedly connected to an inner wall of the ring frame 19 in a fixed shaft rotation manner, and the ring frame 19 is fixedly connected to the inner wall of the pipe.

In this embodiment, a section of the rotating shaft 1 between the casing 11 and the turntable 23 is sleeved and slidably connected with the shaft sleeve 7, two ends of the shaft sleeve 7 are respectively fixed with the first convex ring 15 and the second convex ring 17, a plurality of racks 18 corresponding to the grooves 24 one by one are fixed on the second convex ring 17, and the racks 18 are engaged with and connected with the gears 25 in the corresponding grooves 24.

In this embodiment, a circular plate 13 is coaxially fixed on a section of the rotating shaft 1 between the casing 11 and the shaft sleeve 7, the shaft sleeve 7 is connected with the circular plate 13 through a spring 4, a balancing weight 5 is arranged between the convex ring 15 and the circular plate 13, and the balancing weight 5 is hinged with the convex ring 15 and the circular plate 13 through two connecting rods 14 respectively.

In this embodiment, the heat dissipation assembly includes a heat dissipation disc 9 disposed inside a housing 11 and used for dissipating heat from a chip 8, the heat dissipation disc 9 is coaxially fixed on a rotating shaft 1, the heat dissipation disc 9 is buckled on a positioning slot 27 formed on a rotor 10, a heat dissipation fin 28 is fixed on the heat dissipation disc 9, an air inlet hole I38 and an air outlet hole I36 are formed on the housing 11, the air inlet hole I38 and the air outlet hole I36 are respectively located at two sides of the chip 8, a sealing cylinder 29 is sleeved on and slidingly connected with an outer side wall of the housing 11, the sealing cylinder 29 can simultaneously seal the air inlet hole I38 and the air outlet hole I36, when the brushless fan is stopped and does not work, the sealing cylinder 29 simultaneously seals the air outlet hole I36 and the air inlet hole I38, thereby preventing external dust from entering the housing 11 and damaging internal components, the brushless fan has a dustproof function when not working, the sealing cylinder 29 is provided with a second air inlet hole 39 and a second air outlet hole 37, the second air inlet hole 39 is completely identical to and corresponds to the first air inlet hole 38, the second air outlet hole 37 is completely identical to and corresponds to the first air outlet hole 36, the first air inlet hole 38 is communicated with the second air inlet hole 39, the first air outlet hole 36 is communicated with the second air outlet hole 37, the shaft sleeve 7 is sleeved with and fixedly connected with the sleeve 16 in a shaft rotating manner, the sleeve 16 is positioned between the first convex ring 15 and the second convex ring 17, the sleeve 16 is fixedly provided with a second convex rod 6, the second convex rod 6 is fixedly connected with the first convex rod 2 through a first connecting rod 3, and the first convex rod 2 is fixedly connected with the sealing cylinder 29.

In this embodiment, the dust removing mechanism includes an air inlet pipe 40 fixed at the port of the air inlet hole II 39 and an air outlet pipe 30 fixed at the port of the air outlet hole II 37, one end of the air inlet pipe 40 away from the air inlet hole II 39 is fixed with a filter screen 34, a pump wheel 31 corresponding to and communicating with the air outlet pipe 30 is fixed on a sealing cylinder 29, a circular plate II 26 is arranged on the outer end wall of the pump wheel 31, the circular plate II 26 is fixedly connected with an impeller inside the pump wheel 31 coaxially, a bracket II 32 corresponding to the pump wheel 31 is fixed on the sealing cylinder 29, a sliding rod 33 is slidingly connected on the bracket II 32, two ends of the sliding rod 33 are respectively fixed with a carriage 42 and a brush head 35, a pin 41 is fixed at a position, away from the center of a circle, on the circular plate II 26, the pin 41 is spliced and can slide on a strip-shaped through groove arranged on the carriage 42, and the brush head 35 is used for cleaning dust on the surface of the filter screen 34.

The invention has the working principle and advantages that: when the brushless fan with the self-adaptive adjusting function is used, the working process is as follows:

as shown in fig. 1 and fig. 2, when the brushless fan is used for inputting or outputting air to the space in the vehicle, the rotor 10 drives the turntable 23 to rotate through the rotating shaft 1, so that the turntable 23 drives the blades 21 to rotate through the second shaft lever 22, and the blades 21 apply thrust to the air in the pipeline to realize inputting or outputting of the air.

When the air quantity is regulated, the output power of the brushless fan is regulated to enable the rotating speed of the rotor 10 driving the rotating shaft 1 to be increased or reduced, so that the rotating speed of the turntable 23 driving the blades 21 is increased or reduced, and the air quantity is regulated.

When the rotation speed of the rotation shaft 1 is increased, the rotation shaft 1 synchronously drives the first circular plate 13 to increase in rotation speed, the first circular plate 13 drives the balancing weight 5 to increase in rotation speed through the second connecting rod 14, the centrifugal force obtained by the balancing weight 5 is increased, the balancing weight 5 drives the first convex ring 15 to approach the first circular plate 13 through the second connecting rod 14, meanwhile, the first convex ring 15 drives the shaft sleeve 7 to approach the first circular plate 13 and compress the spring 4, the spring 4 obtains a restoring force, the shaft sleeve 7 drives the shaft sleeve 7 to approach the first circular plate 13 and simultaneously enables the shaft sleeve 7 to pull out each rack 18 into the corresponding groove 24 through the second convex ring 17, so that the racks 18 drive the corresponding gears 25 to rotate, and the gears 25 drive the corresponding blades 21 to rotate through the second connecting rod 22, and accordingly the installation angle of the corresponding blades 21 is automatically adjusted, and the thrust of the blades 21 to air is correspondingly increased.

When the rotation speed of the rotation shaft 1 is reduced, the rotation shaft 1 synchronously drives the circular plate I13 to slow down, the circular plate I13 drives the balancing weight 5 to slow down through the connecting rod II 14, the centrifugal force obtained by the balancing weight 5 is reduced, the convex ring I15 is far away from the circular plate I13 under the action of the restoring force of the spring 4, meanwhile, the shaft sleeve 7 moves each rack 18 into the corresponding groove 24 through the convex ring II 17, the racks 18 drive the corresponding gears 25 to reversely rotate, the gears 25 drive the corresponding blades 21 to reversely rotate through the shaft II 22, and accordingly the installation angle of the corresponding blades 21 is automatically adjusted, and the thrust of the blades 21 to air is correspondingly reduced.

In summary, the mounting angle of the corresponding blade 21 is automatically adjusted while the air quantity is adjusted by adjusting the output power of the brushless fan, so that the air quantity adjusting efficiency of the brushless fan is increased, and the sensitivity of the air quantity adjusting of the air conditioning system of the automobile is improved.

As shown in fig. 1, fig. 3 and fig. 4, the rotating shaft 1 rotates while making the balancing weight 5 obtain centrifugal force, thereby making the shaft sleeve 7 approach to the circular plate 13, and then making the shaft sleeve 7 drive the sealing cylinder 29 to move left on the shell 11 through the sleeve 16, the protruding rod two 6, the connecting rod one 3 and the protruding rod one 2, thereby making the sealing cylinder 29 drive the air inlet two 39 to be communicated with the air inlet one 38, the air outlet two 37 to be communicated with the air outlet one 36, and simultaneously rotating the rotating shaft 1 while driving the heat dissipation disc 9 to rotate, making the heat dissipation disc 9 suck external air into the shell 11 through the air inlet two 39 and the air inlet one 38 through the heat dissipation disc 28, and push the air entering into the shell 11 to the chip 8, so that the air takes away heat on the chip 8, cool down the chip 8, avoid damaging the chip 8 due to overhigh temperature, and improve the service life of the brushless fan, and make the balancing weight 5 obtain larger centrifugal force while improving output power, and further make the air inlet two 39 to be communicated with the air inlet one 38, the air outlet two 37 to the air outlet one 36 to correspondingly increase the communication area of the air inlet two 37 and the air outlet one 36, so as to correspondingly increase the air flow rate of the brushless fan, and realize the corresponding cooling effect on the chip 8 when cooling down the chip 8.

And the brushless fan reduces output power and simultaneously enables the balancing weight 5 to obtain smaller centrifugal force, so that the communication area between the air inlet hole II 39 and the air inlet hole 38 and the communication area between the air outlet hole II 37 and the air outlet hole 36 are correspondingly reduced, when the brushless fan stops and does not work, the sealing cylinder 29 simultaneously seals the air outlet hole 36 and the air inlet hole 38, external dust is prevented from entering the shell 11 and damaging internal components, and the brushless fan has a dustproof function when not working.

As described above, the external air is filtered and purified by the filter screen 34 to remove dust and impurities in the air, and then enters the housing 11 through the air inlet pipe 40, the second air inlet hole 39 and the first air inlet hole 38, so that when the brushless fan works, the external dust is prevented from entering the housing 11 to damage internal components, and the service life of the brushless fan is prolonged.

When the hot air is output to the outside of the shell 11 through the first air outlet hole 36, the second air outlet hole 37 and the air outlet pipe 30, the air flow in the air outlet pipe 30 drives the impeller in the pump impeller 31 to rotate, so that the impeller synchronously drives the second circular plate 26 to rotate, the second circular plate 26 drives the sliding frame 42 to move left and right in the figure 4 through the pin rod 41, and the sliding frame 42 drives the brush head 35 to reciprocate through the sliding rod 33 to remove dust and sundries on the outer surface of the filter screen 34, so that the filter screen 34 is prevented from being blocked, the efficient filtering effect of the filter screen 34 is ensured, the blocking is prevented from being unsmooth, and the cooling effect of the chip 8 is further ensured.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Claims

1. The utility model provides a brushless fan with self-adaptation regulatory function, includes casing (11) of fixing on the pipeline inner wall through support one (12), casing (11) inside wall is fixed with stator and chip (8), and the inboard coaxial rotor (10) that is provided with of stator, its characterized in that: the rotor (10) is coaxially and fixedly connected with the rotating shaft (1), one end of the rotating shaft (1) extends outwards to the outer side of the shell (11), one end of the rotating shaft (1) located at the outer side of the shell (11) is provided with a fan blade assembly capable of self-adaptively adjusting angles, the shell (11) is provided with a heat dissipation assembly used for dissipating heat of the chip (8), and the heat dissipation assembly is provided with a dust removal mechanism used for purifying air entering the inner part of the shell (11).

2. The brushless fan with adaptive tuning function of claim 1, wherein: the fan blade assembly comprises a rotary table (23) coaxially fixed at one end part of the rotary shaft (1) located at the outer side of the casing (11), a plurality of grooves (24) are formed in positions, away from the center of a circle, of the rotary table (23), the grooves (24) are arranged at equal intervals along the circumferential direction of the rotary table (23), gears (25) are rotatably connected with the inner shafts of the grooves (24), shaft rods II (22) are coaxially and fixedly connected to the gears (25), the shaft rods II (22) are perpendicular to the rotary shaft (1), the shaft rods II (22) penetrate through and fixedly connected to the side walls of the grooves (24) in a rotating mode, and one ends, away from the gears (25), of the shaft rods II (22) are fixedly connected with blades (21).

3. The brushless fan with adaptive tuning function of claim 2, wherein: one end of each blade (21) far away from the corresponding shaft lever II (22) is fixedly connected with the corresponding shaft lever I (20), the shaft lever I (20) and the shaft lever II (22) share the central axis, one end of each shaft lever I (20) far away from each blade (21) is fixedly connected onto the inner side wall of the corresponding ring frame (19) in a rotating mode, and the corresponding ring frame (19) is fixedly connected onto the inner wall of the pipeline in a rotating mode.

4. The brushless fan with adaptive tuning function of claim 2, wherein: the rotating shaft (1) is sleeved on a section between the shell (11) and the rotary table (23) and is connected with a shaft sleeve (7) in a sliding manner, a first convex ring (15) and a second convex ring (17) are respectively fixed at two ends of the shaft sleeve (7), a plurality of racks (18) which are in one-to-one correspondence with the grooves (24) are fixed on the second convex ring (17), and the racks (18) are in meshed connection with gears (25) in the corresponding grooves (24);

the rotary shaft (1) is located at a section between the shell (11) and the shaft sleeve (7) and is coaxially fixed with a circular plate I (13), the shaft sleeve (7) is connected with the circular plate I (13) through a spring (4), a balancing weight (5) is arranged between the convex ring I (15) and the circular plate I (13), and the balancing weight (5) is hinged with the convex ring I (15) and the circular plate I (13) through two connecting rods II (14) respectively.

5. The brushless fan with adaptive tuning function of claim 4, wherein: the heat dissipation assembly comprises a heat dissipation disc (9) which is arranged inside a shell (11) and used for dissipating heat of a chip (8), the heat dissipation disc (9) is coaxially fixed on a rotating shaft (1), the heat dissipation disc (9) is buckled on a positioning groove (27) formed in a rotor (10), a heat dissipation fin (28) is fixed on the heat dissipation disc (9), an air inlet hole I (38) and an air outlet hole I (36) are formed in the shell (11), and the air inlet hole I (38) and the air outlet hole I (36) are respectively located on two sides of the chip (8).

6. The brushless fan with adaptive tuning function of claim 5, wherein: the shell (11) is sleeved on the outer side wall of the shell and is connected with a sealing cylinder (29) in a sliding manner, the sealing cylinder (29) can simultaneously seal the first air inlet hole (38) and the first air outlet hole (36), the sealing cylinder (29) is provided with the second air inlet hole (39) and the second air outlet hole (37), the second air inlet hole (39) and the first air inlet hole (38) are completely identical and are correspondingly arranged, the second air outlet hole (37) and the first air outlet hole (36) are completely identical and are correspondingly arranged, and the first air inlet hole (38) and the second air inlet hole (39) are communicated, and the first air outlet hole (36) and the second air outlet hole (37) are communicated.

7. The brushless fan with adaptive tuning function of claim 6, wherein: the shaft sleeve (7) is sleeved with a fixed shaft rotary connecting sleeve (16), the sleeve (16) is positioned between the first convex ring (15) and the second convex ring (17), the second convex rod (6) is fixed on the sleeve (16), the second convex rod (6) is fixedly connected with the first convex rod (2) through the first connecting rod (3), and the first convex rod (2) is fixedly connected with the sealing cylinder (29).

8. The brushless fan with adaptive tuning function of claim 6, wherein: the dust removing mechanism comprises an air inlet pipe (40) fixed at the port of the air inlet hole II (39) and an air outlet pipe (30) fixed at the port of the air outlet hole II (37), and a filter screen (34) is fixed at one end, far away from the air inlet hole II (39), of the air inlet pipe (40).

9. The brushless fan with adaptive tuning function of claim 8, wherein: the sealing cylinder (29) is fixedly provided with a pump wheel (31) which corresponds to and is communicated with the air outlet pipe (30), the outer end wall of the pump wheel (31) is provided with a circular plate II (26), and the circular plate II (26) is coaxially and fixedly connected with an impeller inside the pump wheel (31).

10. The brushless fan with adaptive tuning function of claim 9, wherein: be fixed with on seal section of thick bamboo (29) with the corresponding support second (32) of pump impeller (31), sliding connection has slide bar (33) on support second (32), and the both ends of slide bar (33) are fixed with balladeur train (42) and brush head (35) respectively, the position of keeping away from the centre of a circle on plectane second (26) is fixed with round pin pole (41), round pin pole (41) are pegged graft and can slide on the bar logical groove of seting up on balladeur train (42), brush head (35) are used for cleaning the dust to the surface of filter screen (34).