High-speed mute brushless direct current motor

Abstract

The invention discloses a high-speed mute brushless direct-current motor, and relates to the technical field of brushless direct-current motors, the high-speed mute brushless direct-current motor comprises a motor outer shell, a motor inner shell is arranged in the motor outer shell, a stator is arranged in the motor inner shell, a rotor is arranged in the stator, and the rotor is arranged in the motor outer shell. The rotor penetrates through the surface of the motor outer shell and is rotationally connected with the interior of the motor outer shell, the surface of the rotor is fixedly connected with a heat dissipation fan, the heat dissipation fan is located in the motor outer shell, the surface of the motor outer shell is provided with a heat dissipation opening, and the two ends of the motor inner shell are fixedly connected with mounting plates which are circumferentially arranged at equal intervals. According to the high-speed mute brushless direct current motor, elements of the motor are wrapped in two layers, active heat dissipation is carried out on the interior of the motor in an air cooling and water cooling mode, the situation that internal devices of the motor are polluted due to the fact that the internal structure of the motor is exposed outside is avoided, cleanliness of the interior of the motor is guaranteed, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless DC motors, and particularly to a high-speed silent brushless DC motor. Background Art

[0002] The brushless motor adopts electronic commutation, with the coil stationary and the magnetic pole rotating. The brushless motor senses the position of the permanent magnet pole through Hall elements, and uses electronic circuits to timely switch the direction of the current in the coil to ensure the generation of the correct magnetic force to drive the motor. Using electronic switching devices to replace traditional contact commutators and brushes has the advantages of high reliability, no commutation sparks, and low mechanical noise compared with traditional brushed motors, and is widely used in various electronic instruments and automated office equipment.

[0003] However, when the existing brushless DC motor is in use, it usually adopts the method of fan heat dissipation. As heat energy is transferred with the air flow, fine impurities in the external environment will also be "sucked" into the motor interior, which will directly affect the structures such as the rotor and stator inside the motor and thus affect the motor operation efficiency. Summary of the Invention

[0004] An object of the present invention is to solve at least one of the technical problems existing in the prior art, and provide a high-speed silent brushless DC motor, which can solve the problems in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A high-speed silent brushless DC motor, including a motor housing, a motor inner housing is arranged inside the motor housing, a stator is arranged inside the motor inner housing, a rotor is arranged in the stator, the rotor penetrates the surface of the motor housing and is rotatably connected to the inside of the motor housing, a cooling fan is fixedly connected to the surface of the rotor, the cooling fan is located inside the motor housing, a heat dissipation port is opened on the surface of the motor housing, both ends of the motor inner housing are fixedly connected with mounting plates arranged at equal circumferential intervals, the surface of the mounting plate is fixedly connected with the inner wall of the motor housing, a rotating rod is rotatably connected between two opposite mounting plates, both ends of the rotating rod penetrate the surface of the mounting plate, a ring groove is opened on the surface of the motor inner housing, a rotating shell is rotatably connected to the inner wall of the ring groove, a first exhaust groove arranged at equal circumferential intervals is opened on the surface of the rotating shell, and a second exhaust groove arranged at equal circumferential intervals is opened on the inner wall of the ring groove.

[0006] Preferably, an external gear ring is fixedly connected to the surface of the rotating shell, a first gear is fixedly connected to the surface of the rotating rod, the surface of the first gear is meshed with the surface of the external gear ring, a connecting rod arranged at equal circumferential intervals is fixedly connected to the surface of the rotor, a transmission gear ring is fixedly connected to the end of the connecting rod away from the rotor, a transmission gear is fixedly connected to one end of the rotating rod, and the surface of the transmission gear is meshed with the surface of the transmission gear ring.

[0007] Preferably, a cooling water tank is fixedly connected to the top of the motor housing. The interior of the cooling water tank contains a coolant. A water collecting cylinder is fixedly connected to the interior of the motor housing. A second return pipe communicating with the interior of the water collecting cylinder is fixedly connected to the interior of the water collecting cylinder. One end of the second return pipe away from the water collecting cylinder is fixedly connected to the cooling water tank and communicates with the interior of the cooling water tank. Two spiral pipes are sleeved on the surface of the rotating shell. The two spiral pipes are respectively located on both sides of the external tooth ring, and the two spiral pipes are communicated with each other through a connecting pipe. One end of the spiral pipe close to the water collecting cylinder communicates with the interior of the water collecting cylinder. One end of the spiral pipe away from the water collecting cylinder is fixedly connected to a first return pipe. One end of the first return pipe away from the spiral pipe is fixedly connected to the interior of the cooling water tank and communicates with the interior of the cooling water tank.

[0008] Preferably, a pressing block penetrating the surface of the water collecting cylinder is slidably connected to the interior of the water collecting cylinder. The cross section of the pressing block is T-shaped. A sealing gasket is arranged on the surface of the pressing block. A first return spring is fixedly connected between the water collecting cylinder and the pressing block.

[0009] Preferably, a filter screen is rotatably connected to the inner wall of the motor housing. An installation shell is fixedly connected to the inner wall of the motor housing. The rotor penetrates the surface of the installation shell and is rotatably connected to the interior of the installation shell. A second gear is rotatably connected to the inner wall of the installation shell. A third gear is fixedly connected to the surface of the rotor. The surface of the third gear is meshed with the surface of the second gear. An internal tooth ring is fixedly connected to the inner wall of the filter screen. The surface of the internal tooth ring is meshed with the surface of the second gear. A through groove is arranged on the surface of the installation shell.

[0010] Preferably, a fixing frame is fixedly connected to one end of the pressing block located outside the water collecting cylinder. A connecting frame arranged in a circumferentially equidistant manner is fixedly connected to the surface of the fixing frame. One end of the connecting frame away from the fixing frame is slidably connected to one end of a rotating rod.

[0011] Preferably, two arc-shaped grooves are formed at one end of the rotating rod close to the water collecting cylinder. Two straight grooves are formed on the surface of the rotating rod. Two ends of the two straight grooves are respectively communicated with the two arc-shaped grooves. Two sliding rods are fixedly connected to the interior of the connecting frame. The surface of the sliding rods is slidably connected to the inner walls of the arc-shaped grooves and the straight grooves. One end of the sliding rod away from the connecting frame is hemispherical.

[0012] Preferably, fixing rings are fixedly connected inside both the first return pipe and the second return pipe. A plugging block with a T-shaped cross-section is slidably connected to the inner wall of the fixing ring. A sealing gasket is also arranged between the plugging block and the fixing ring. A second return spring is fixedly connected to the surface of the plugging block, and the end of the second return spring away from the plugging block is fixedly connected to the surface of the fixing ring. The fixing rings and the plugging blocks of the first return pipe and the second return pipe are arranged in opposite directions.

[0013] Preferably, a brush plate is fixedly connected to the inner wall of the motor housing, and the surface of the brush plate is in contact with the surface of the filter screen.

[0014] Preferably, heat dissipation fins are arranged on the surface of the motor housing.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) For this high-speed silent brushless DC motor, the components of the motor are wrapped in two layers, and the inside of the motor is actively cooled by air cooling and water cooling methods. This avoids the situation where the internal structure of the motor is exposed to the outside, preventing the internal components of the motor from being contaminated, ensuring the cleanliness inside the motor, and extending the service life of the motor.

[0016] (2) For this high-speed silent brushless DC motor, the differential rotation of the filter screen and the cooling fan is used to cut the discharged hot air, avoiding the situation of high wind speed and large wind noise when the hot air is discharged, thereby improving the silent effect during the use of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments: Figure 1 is a schematic structural diagram of the high-speed silent brushless DC motor of the present invention; Figure 2 is a schematic diagram of the internal structure of the motor housing of the present invention; Figure 3 is of the present invention Figure 2 the enlarged schematic diagram at A in; Figure 4 is a schematic diagram of the internal structure of the water collecting cylinder of the present invention; Figure 5 is of the present invention Figure 4 the enlarged schematic diagram at B in; Figure 6 is a schematic diagram of the internal structure of the connecting frame of the present invention; Figure 7 is a schematic diagram of the surface structure of the inner housing of the motor of the present invention; Figure 8 is a schematic diagram of the internal structure of the second return pipe of the present invention; Figure 9 is a schematic diagram of the surface structure of the motor housing of the present invention.

[0018] Reference numerals: 1, motor housing; 2, heat dissipation fins; 3, rotor; 4, heat dissipation port; 5, cooling water tank; 6, first return pipe; 7, second return pipe; 8, filter screen; 9, heat dissipation fan; 10, transmission gear; 11, connecting rod; 12, transmission gear ring; 13, spiral pipe; 14, first gear; 15, rotating rod; 16, external gear ring; 17, rotating housing; 18, mounting plate; 19, inner motor housing; 20, extrusion block; 21, first return spring; 22, water collecting cylinder; 23, mounting housing; 24, internal gear ring; 25, second gear; 26, through slot; 27, third gear; 28, fixing bracket; 29, connecting bracket; 30, arc-shaped slot; 31, straight slot; 32, sliding rod; 33, first exhaust slot; 34, second exhaust slot; 35, plugging block; 36, second return spring; 37, fixing ring; 38, brush plate. Detailed implementation manners

[0019] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0020] Please refer to Figures 1-9 , the present invention provides a technical solution: a high-speed silent brushless DC motor, including a motor housing 1. Heat dissipation fins 2 are arranged on the surface of the motor housing 1 to assist the motor in heat dissipation. An inner motor housing 19 is arranged inside the motor housing 1. A stator is arranged inside the inner motor housing 19. A rotor 3 is arranged in the stator. The rotor 3 penetrates the surface of the motor housing 1 and is rotatably connected to the inside of the motor housing 1. A heat dissipation fan 9 is fixedly connected to the surface of the rotor 3. The heat dissipation fan 9 is located inside the motor housing 1, so that the power when the rotor 3 rotates can be utilized to drive the heat dissipation fan 9 to rotate, and then the heat inside the motor housing 1 can be sucked out.

[0021] A heat dissipation port 4 is opened on the surface of the motor housing 1 to provide a discharge channel for the hot air inside the motor housing 1. A filter screen 8 is rotatably connected to the inner wall of the motor housing 1. Thus, through the setting of the filter screen 8, when the motor is not in use, the situation that impurities in the external air enter the motor through the heat dissipation port 4 can be prevented.

[0022] The inner wall of the motor housing 1 is fixedly connected with a mounting shell 23. The rotor 3 passes through the surface of the mounting shell 23 and is rotatably connected to the inside of the mounting shell 23. The inner wall of the mounting shell 23 is rotatably connected with a second gear 25. The surface of the rotor 3 is fixedly connected with a third gear 27. The surface of the third gear 27 is meshed with the surface of the second gear 25. The inner wall of the filter screen 8 is fixedly connected with an internal gear ring 24. The surface of the internal gear ring 24 is meshed with the surface of the second gear 25. Thus, through the transmission of the third gear 27, the second gear 25 and the internal gear ring 24, when the rotor 3 starts, it can synchronously drive the filter screen 8 to rotate in the motor housing 1. At the same time, since the rotation speeds of the filter screen 8 and the rotor 3 are different, when the filter screen 8 rotates, it can divide the hot air flow sucked out by the cooling fan 9, thereby reducing the situation that when the hot air is discharged, the wind speed is relatively fast, resulting in wind noise, and thus improving the mute effect of the motor during use.

[0023] A through groove 26 is formed on the surface of the mounting shell 23 to provide a meshing space for the second gear 25 and the internal gear ring 24.

[0024] The inner wall of the motor housing 1 is fixedly connected with a brush plate 38. The surface of the brush plate 38 is in contact with the surface of the filter screen 8. Thus, through the arrangement of the brush plate 38, when the filter screen 8 rotates, the impurities adhered to the surface of the filter screen 8 can be scraped off by the relative movement between the brush plate 38 and the filter screen 8, so that the impurities will not adhere to the filter screen 8, and then, under the blowing force generated by the cooling fan 9, the impurities on the filter screen 8 can be blown out through the heat dissipation port 4, ensuring the cleanliness inside the motor.

[0025] Both ends of the motor inner housing 19 are fixedly connected with mounting plates 18 arranged at equal circumferential intervals. The surface of the mounting plates 18 is fixedly connected with the inner wall of the motor housing 1, providing a stable mounting basis for the motor inner housing 19 inside the motor housing 1. A rotating rod 15 is rotatably connected between two opposite mounting plates 18. Both ends of the rotating rod 15 pass through the surface of the mounting plates 18.

[0026] The surface of the inner housing 19 of the motor is provided with an annular groove. The inner wall of the annular groove is rotatably connected to a rotating housing 17. The surface of the rotating housing 17 is provided with first exhaust grooves 33 arranged at equal circumferential intervals. The inner wall of the annular groove is provided with second exhaust grooves 34 arranged at equal circumferential intervals. The surface of the rotating housing 17 is fixedly connected with an external gear ring 16. The surface of the rotating rod 15 is fixedly connected with a first gear 14. The surface of the first gear 14 is meshed with the surface of the external gear ring 16. Thus, through the transmission of the first gear 14 and the external gear ring 16, when the rotating rod 15 rotates, it can drive the rotating housing 17 to rotate synchronously through the meshing of the first gear 14 and the external gear ring 16, so that the air flow at the position of the first exhaust groove 33 flows at a high speed, thus forming a "negative pressure suction" situation. Therefore, the hot air inside the inner housing 19 of the motor can be continuously sucked out through the second exhaust groove 34 into the space between the motor housing 1 and the inner housing 19 of the motor. Subsequently, with the suction generated by the cooling fan 9, it is discharged to the outside, so that the inside of the motor is always not connected to the outside, and the heat dissipation of the inside of the motor can be completed, thus ensuring the cleanliness inside the motor, avoiding the situation of the inside of the motor being polluted, and improving the service life of the motor.

[0027] The surface of the rotor 3 is fixedly connected with connecting rods 11 arranged at equal circumferential intervals. One end of the connecting rod 11 away from the rotor 3 is fixedly connected with a transmission gear ring 12. One end of the rotating rod 15 is fixedly connected with a transmission gear 10. The surface of the transmission gear 10 is meshed with the surface of the transmission gear ring 12. Furthermore, when the rotor 3 rotates, it can drive the rotating rod 15 to rotate synchronously through the meshing of the transmission gear ring 12 and the transmission gear 10.

[0028] The top of the motor housing 1 is fixedly connected with a cooling water tank 5. The inside of the cooling water tank 5 contains coolant. The inside of the motor housing 1 is fixedly connected with a water collecting cylinder 22. The inside of the water collecting cylinder 22 is fixedly connected with a second return pipe 7 that is communicated with the inside of the water collecting cylinder 22. One end of the second return pipe 7 away from the water collecting cylinder 22 is fixedly connected with the cooling water tank 5 and is communicated with the inside of the cooling water tank 5. The inside of the water collecting cylinder 22 is slidably connected with a pressing block 20 that penetrates the surface of the water collecting cylinder 22. The cross section of the pressing block 20 is T-shaped. The surface of the pressing block 20 is provided with a sealing gasket to seal the gap between the water collecting cylinder 22 and the pressing block 20 to ensure the sealing effect between the water collecting cylinder 22 and the pressing block 20.

[0029] A first return spring 21 is fixedly connected between the water collecting cylinder 22 and the extrusion block 20 to reset the extrusion block 20. One end of the extrusion block 20 located outside the water collecting cylinder 22 is fixedly connected with a fixing frame 28. The surface of the fixing frame 28 is fixedly connected with connecting frames 29 arranged at equal circumferential intervals. One end of the connecting frame 29 away from the fixing frame 28 slides with one end of the rotating rod 15. Two arc-shaped grooves 30 are opened at one end of the rotating rod 15 close to the water collecting cylinder 22. Two straight grooves 31 are opened on the surface of the rotating rod 15. The two ends of the two straight grooves 31 are respectively communicated with the two arc-shaped grooves 30. Two sliding rods 32 are fixedly connected inside the connecting frame 29. The surface of the sliding rod 32 slides with the inner walls of the arc-shaped groove 30 and the straight groove 31. One end of the sliding rod 32 away from the connecting frame 29 is hemispherical, thereby improving the smoothness of the sliding rod 32 when sliding in the straight groove 31 and the arc-shaped groove 30.

[0030] Two sets of spiral pipes 13 are sleeved on the surface of the rotating shell 17. The two sets of spiral pipes 13 are respectively located on both sides of the external tooth ring 16, and the two sets of spiral pipes 13 are communicated with each other through a connecting pipe. One end of the spiral pipe 13 close to the water collecting cylinder 22 is communicated with the inside of the water collecting cylinder 22, so that the coolant inside the water collecting cylinder 22 can be injected into the spiral pipe 13 for flow. One end of the spiral pipe 13 away from the water collecting cylinder 22 is fixedly connected with a first return pipe 6. One end of the first return pipe 6 away from the spiral pipe 13 is fixedly connected with the inside of the cooling water tank 5 and is communicated with the inside of the cooling water tank 5, so that the coolant in the cooling water tank 5 can circulate to cool the inside of the motor.

[0031] Fixing rings 37 are fixedly connected inside the first return pipe 6 and the second return pipe 7. A plugging block 35 with a T-shaped cross-section is slidably connected to the inner wall of the fixing ring 37. A sealing gasket is also arranged between the plugging block 35 and the fixing ring 37 to seal the gap between the fixing ring 37 and the plugging block 35. A second return spring 36 is fixedly connected to the surface of the plugging block 35. One end of the second return spring 36 away from the plugging block 35 is fixedly connected to the surface of the fixing ring 37 to reset the plugging block 35. The fixing rings 37 and the plugging blocks 35 of the first return pipe 6 and the second return pipe 7 are arranged in the opposite direction to control the flow direction of the coolant.

[0032] Working principle: When the motor is started, the rotor 3 rotates, thereby driving the cooling fan 9 to rotate to suck out the heat inside the motor. At the same time, the rotation of the rotor 3 drives the third gear 27 to rotate, and through the transmission of the second gear 25 and the internal tooth ring 24, drives the filter screen 8 to rotate to disperse the discharged hot air and reduce the wind speed when the hot air is discharged, thereby reducing the wind noise generated when the motor is working.

[0033] Secondly, while the rotor 3 is rotating, it drives the transmission gear ring 12 to rotate through the connecting rod 11, and drives the rotating rod 15 to rotate through the meshing of the transmission gear ring 12 and the transmission gear 10. While the rotating rod 15 is rotating, it drives the first gear 14 to rotate synchronously, and then drives the rotating shell 17 to rotate through the meshing with the external gear ring 16, so that the air flow at the position of the first exhaust groove 33 flows at a high speed. Since the hot air inside the motor inner shell 19 is in a static state, under the high-speed flow of the air flow at the position of the first exhaust groove 33, a "negative pressure suction" is formed, and the hot air inside the motor inner shell 19 is sucked out through the second exhaust groove 34 and injected between the motor outer shell 1 and the motor inner shell 19. Then, when the cooling fan 9 rotates, under the suction force generated, the hot air in the motor outer shell 1 and the motor inner shell 19 is sucked out and discharged to the outside.

[0034] When the hot air in the motor inner shell 19 flows between the motor outer shell 1 and the motor inner shell 19, the hot air contacts the spiral pipe 13, and the coolant inside the spiral pipe 13 is used to cool the hot air, further achieving the cooling effect of the motor.

[0035] At the same time, during the rotation of the rotating rod 15, the positions of the arc-shaped groove 30 and the straight groove 31 are changed, so that the sliding rod 32 slides in the straight groove 31. At the same time, the inner wall of the arc-shaped groove 30 pushes the sliding rod 32, thereby driving the connecting frame 29 to slide, and driving the extrusion block 20 to slide in the water collecting cylinder 22 through the fixing frame 28, and stretching the first return spring 21, so that the space between the extrusion block 20 and the water collecting cylinder 22 increases, so that the pressure inside it becomes smaller. Under the action of the pressure difference, the coolant in the cooling water tank 5 impacts the blocking block 35 in the second return pipe 7 and stretches the second return spring 36, so that the blocking block 35 is separated from the fixing ring 37, and the coolant in the cooling water tank 5 is injected into the water collecting cylinder 22 through the second return pipe 7 until the pressure in the water collecting cylinder 22 is equal to the pressure in the cooling water tank 5, and the second return spring 36 and the blocking block 35 gradually return to their original states. Then, when the sliding rod 32 moves to the connection position of the arc-shaped groove 30 and the straight groove 31, under the elastic force of the first return spring 21, the water collecting cylinder 22 is pulled to slide back to its original state in the extrusion block 20, and at the same time, the fixing frame 28 and the connecting frame 29 are driven to move, so that the sliding rod 32 slides in the straight groove 31, and the sliding rod 32 moves to the connection position of the straight groove 31 and the other end of the arc-shaped groove 30 again. At the same time, when the extrusion block 20 moves, the coolant inside the water collecting cylinder 22 is squeezed, so as to drive the coolant to flow in the spiral pipe 13, and then flow back into the cooling water tank 5 through the second return pipe 7, realizing the circulating flow of the coolant, avoiding the situation that the coolant does not flow, resulting in a higher temperature of the coolant and unable to cool the hot air, thereby further cooling the motor and improving the service life of the motor.

[0036] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A high-speed silent brushless DC motor, comprising a motor housing (1), characterized in that: A motor inner shell (19) is arranged inside the motor outer shell (1), a stator is arranged inside the motor inner shell (19), a rotor (3) is arranged in the stator, the rotor (3) penetrates the surface of the motor outer shell (1) and is rotatably connected to the inside of the motor outer shell (1), a heat dissipation fan (9) is fixedly connected to the surface of the rotor (3), the heat dissipation fan (9) is located inside the motor outer shell (1), a heat dissipation port (4) is opened on the surface of the motor outer shell (1), and both ends of the motor inner shell (19) are fixedly connected to mounting plates arranged equidistantly around the circumference. (18), the surface of the mounting plate (18) is fixedly connected to the inner wall of the motor housing (1), a rotating rod (15) is rotatably connected between the two opposing mounting plates (18), both ends of the rotating rod (15) penetrate the surface of the mounting plate (18), a ring groove is provided on the surface of the motor inner housing (19), a rotating shell (17) is rotatably connected to the inner wall of the ring groove, the surface of the rotating shell (17) is provided with first exhaust grooves (33) arranged at equal distances around the circumference, and the inner wall of the ring groove is provided with second exhaust grooves (34) arranged at equal distances around the circumference.

2. The high-speed silent brushless DC motor according to claim 1, characterized in that: The surface of the rotating shell (17) is fixedly connected to an outer gear ring (16), the surface of the rotating rod (15) is fixedly connected to a first gear (14), the surface of the first gear (14) is meshingly connected to the surface of the outer gear ring (16), the surface of the rotor (3) is fixedly connected to connecting rods (11) arranged at circumferential equidistant intervals, one end of the connecting rod (11) away from the rotor (3) is fixedly connected to a transmission gear ring (12), one end of the rotating rod (15) is fixedly connected to a transmission gear (10), the surface of the transmission gear (10) is meshingly connected to the surface of the transmission gear ring (12).

3. The high-speed silent brushless DC motor according to claim 2, characterized in that: The top of the motor housing (1) is fixedly connected to a cooling water tank (5), the interior of the cooling water tank (5) contains coolant, the interior of the motor housing (1) is fixedly connected to a water collecting cylinder (22), the interior of the water collecting cylinder (22) is fixedly connected to a second return pipe (7) connected to the interior of the water collecting cylinder (22), one end of the second return pipe (7) away from the water collecting cylinder (22) is fixedly connected to the cooling water tank (5) and is connected to the interior of the cooling water tank (5), and the surface of the rotating shell (17) is provided with two groups of spiral pipes (1 3), the two groups of spiral pipes (13) are respectively located on both sides of the outer gear ring (16), and the two groups of spiral pipes (13) are interconnected through a connecting pipe, one end of the spiral pipe (13) close to the water collecting cylinder (22) is connected to the interior of the water collecting cylinder (22), and one end of the spiral pipe (13) away from the water collecting cylinder (22) is fixedly connected to the first return pipe (6), and one end of the first return pipe (6) away from the spiral pipe (13) is fixedly connected to the interior of the cooling water tank (5) and is interconnected with the interior of the cooling water tank (5).

4. The high-speed silent brushless DC motor according to claim 3, characterized in that: The water collecting cylinder (22) is slidably connected to an extrusion block (20) penetrating the surface of the water collecting cylinder (22); the cross section of the extrusion block (20) is T-shaped; a sealing gasket is provided on the surface of the extrusion block (20); and a first return spring (21) is fixedly connected between the water collecting cylinder (22) and the extrusion block (20).

5. The high-speed silent brushless DC motor according to claim 4, characterized in that: The inner wall of the motor housing (1) is rotatably connected to a filter screen (8), the inner wall of the motor housing (1) is fixedly connected to a mounting shell (23), the rotor (3) passes through the surface of the mounting shell (23) and is rotatably connected to the inside of the mounting shell (23), the inner wall of the mounting shell (23) is rotatably connected to a second gear (25), the surface of the rotor (3) is fixedly connected to a third gear (27), the surface of the third gear (27) is meshingly connected to the surface of the second gear (25), the inner wall of the filter screen (8) is fixedly connected to an inner gear ring (24), the surface of the inner gear ring (24) is meshingly connected to the surface of the second gear (25), and a through groove (26) is provided on the surface of the mounting shell (23).

6. The high-speed silent brushless DC motor according to claim 5, characterized in that: One end of the extrusion block (20) located outside the water collecting cylinder (22) is fixedly connected to a fixing frame (28), and the surface of the fixing frame (28) is fixedly connected to connecting frames (29) arranged equidistantly around the circumference, and one end of the connecting frame (29) away from the fixing frame (28) slides relative to one end of the rotating rod (15).

7. The high-speed silent brushless DC motor according to claim 6, characterized in that: The rotating rod (15) has two arc grooves (30) at one end close to the water collecting cylinder (22), and the surface of the rotating rod (15) has two straight grooves (31). The two ends of the two straight grooves (31) are respectively connected to the two arc grooves (30). The interior of the connecting frame (29) is fixedly connected to two sliding rods (32). The surface of the sliding rod (32) slides with the inner walls of the arc groove (30) and the straight groove (31), and the end of the sliding rod (32) away from the connecting frame (29) is hemispherical.

8. The high-speed silent brushless DC motor according to claim 7, characterized in that: A fixing ring (37) is fixedly connected to the inside of each of the first return pipe (6) and the second return pipe (7); a blocking block (35) having a T-shaped cross section is slidably connected to the inner wall of the fixing ring (37); a sealing gasket is also provided between the blocking block (35) and the fixing ring (37); a second return spring (36) is fixedly connected to the surface of the blocking block (35); one end of the second return spring (36) away from the blocking block (35) is fixedly connected to the surface of the fixing ring (37); and the fixing ring (37) and the blocking block (35) of the first return pipe (6) and the second return pipe (7) are arranged opposite to each other.

9. The high-speed silent brushless DC motor according to claim 8, characterized in that: A brush plate (38) is fixedly connected to the inner wall of the motor housing (1), and the surface of the brush plate (38) is in contact with the surface of the filter screen (8).

10. The high-speed silent brushless DC motor according to claim 1, characterized in that: A heat dissipation fin plate (2) is provided on the surface of the motor housing (1).

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