A permanent magnet brushless motor structure based on water pump

Abstract

The invention relates to the technical field of brushless motors, and proposes a permanent magnet brushless motor structure based on a water pump, comprising a motor housing, a motor body, a water pump body, a water inlet, a water outlet, a cooling component, a circulation component, a driving component and a ventilation component, wherein the motor body is installed inside the motor housing, the motor body is provided with two output shafts, the water pump body is installed on the upper part of the motor housing, the top of the water pump body is provided with a water inlet, the side of the water pump body is provided with a water outlet, the cooling component is installed inside the motor housing, the circulation component is installed on the cooling component, the driving component is installed on the output shaft of the motor body located at the bottom, and the ventilation component is installed at the bottom of the motor housing. Through the above technical scheme, the problem in the prior art that the motor may generate too much heat during use, resulting in unstable operation of the motor during operation, thereby affecting its service life is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless motors, and in particular to a permanent magnet brushless motor structure based on a water pump. Background Art

[0002] Permanent magnet brushless motor is a common type of motor with the advantages of high efficiency, low noise and low maintenance cost. Its working principle is to drive the rotor to rotate through a rotating magnetic field to achieve the conversion of mechanical energy. This motor does not have traditional components such as brushes and commutators, so it can reduce friction and wear, improve efficiency and extend service life.

[0003] During the operation of the motor, the rotor will generate a large amount of heat during high-speed rotation, which will cause the rotor to heat up. If the motor generates too much heat during use, it may cause the motor material to expand and deform, resulting in its performance degradation, and may even damage the internal parts of the motor, such as bearings, insulating materials, etc., causing the motor speed to be unstable, affecting its output power and efficiency. In addition, it may also cause the noise during the operation of the motor to increase, affecting its use environment, shortening the service life of the motor, and posing a safety hazard. Summary of the invention

[0004] The present invention proposes a permanent magnet brushless motor structure based on a water pump, which solves the problem in the prior art that the motor may generate excessive heat during use, resulting in unstable operation of the motor during operation, thereby affecting its service life.

[0005] The technical solution of the present invention is as follows:

[0006] A permanent magnet brushless motor structure based on a water pump comprises a motor housing, a motor body, the motor body is fixedly mounted inside the motor housing, the motor body is provided with two output shafts, a water pump body is fixedly mounted on the upper part of the motor housing, the output shaft of the motor body located at the upper part is fixedly connected to the pump shaft of the water pump body, the water pump body is provided with a water inlet and a water outlet, and further comprises:

[0007] A cooling assembly, the cooling assembly is installed inside the motor housing and is used to cool the motor body;

[0008] A circulation component, the circulation component is installed on the cooling component and is used for heat dissipation;

[0009] A driving assembly, the driving assembly being mounted on an output shaft at the lower portion of the motor body and used for driving the circulation assembly to move;

[0010] A ventilation assembly is installed at the bottom of the motor housing for ventilation.

[0011] Based on the above solution, the cooling assembly includes:

[0012] A water outlet pipe, the water outlet pipe is connected to the water outlet;

[0013] A joint, wherein the end of the water outlet pipe away from the water outlet is fixedly mounted with the joint;

[0014] A spiral tube is fixedly installed inside the motor housing, the spiral tube is in contact with the motor body, and the input end of the spiral tube is connected to the water outlet pipe through a one-way valve.

[0015] Based on the above scheme, the circulation component includes:

[0016] A circulation pipe, wherein the circulation pipe is fixedly mounted on the motor housing;

[0017] A rotating shell is provided on one end of the circulation pipe so as to be rotatably and sealably mounted thereon, and the rotating shell is rotatably and sealably connected to the output end of the spiral pipe.

[0018] In addition to the above solutions, it also includes:

[0019] A rotating block, wherein the rotating block is arranged inside the rotating housing, and the axis position of the rotating block coincides with the axis position of the rotating housing;

[0020] Circulating blades, a plurality of circulating blades are fixedly mounted on the rotating block at equal angles, and the circulating blades are fixedly connected to the inner wall of the rotating shell;

[0021] A drainage part, which is mounted on the motor housing and is used to drain the water entering the spiral tube back to the water outlet pipe;

[0022] The filter part is installed inside the drainage part and is used for filtering the water passing through the spiral tube.

[0023] On the basis of the above scheme, the drainage part comprises:

[0024] A drainage cylinder, wherein the drainage cylinder is fixedly mounted on the motor housing, and a side portion of the bottom end of the drainage cylinder is connected to the circulation pipe;

[0025] A drain pipe, the drain pipe is connected to the side of the top end of the drain cylinder, and the drain pipe is connected to the water outlet pipe through the one-way valve;

[0026] A sealing cover is detachable and sealingly installed at the bottom of the drainage cylinder.

[0027] On the basis of the above scheme, the filter unit comprises:

[0028] An installation cylinder, the installation cylinder is detachably installed inside the drainage cylinder, and the outer wall of the installation cylinder slides and seals with the inner wall of the drainage cylinder;

[0029] An installation cover, the installation cover is detachably and sealingly installed on the top of the installation cylinder;

[0030] A positioning frame, the bottom of the installation tube and the top of the installation cover are both fixedly mounted with the positioning frame;

[0031] The upper positioning frame abuts against the inner top wall of the drainage tube, and the lower positioning frame abuts against the inner bottom wall of the sealing cover;

[0032] Drainage grooves, a plurality of drainage grooves are provided on the two positioning frames at equal angles in a circular shape.

[0033] Based on the above solution, the driving component includes:

[0034] A first helical gear, the output shaft at the bottom of the motor body is fixedly mounted with the first helical gear;

[0035] A second bevel gear is fixedly mounted on the rotating housing and is meshed with the first bevel gear.

[0036] Based on the above solution, the ventilation assembly includes:

[0037] Air inlet slots, a plurality of air inlet slots are provided on the motor housing in a circular shape with equal angles, and the air inlet slots are located on the upper part of the motor body;

[0038] Air outlet slots, a plurality of air outlet slots are provided at equal distances at the bottom of the motor housing;

[0039] An exhaust part is installed at the bottom of the motor housing and is used for exhausting air.

[0040] On the basis of the above scheme, the exhaust part includes:

[0041] A protective shell, the protective shell is fixedly mounted on the bottom of the motor shell;

[0042] An exhaust fan, the exhaust fan being rotatably mounted at the bottom of the motor housing;

[0043] A third bevel gear is fixedly mounted on the exhaust fan and is meshed with the second bevel gear.

[0044] In addition to the above solutions, it also includes:

[0045] Exhaust slots, a plurality of exhaust slots are provided at equal distances at the bottom of the protective shell;

[0046] Dustproof plates, a plurality of dustproof plates are fixedly installed at equal distances inside the protective shell, and the dustproof plates are located on the upper part of the exhaust slot.

[0047] The working principle and beneficial effects of the present invention are:

[0048] 1. In the present invention, the filter element is installed on the installation cylinder, and the installation cover is installed on the top of the installation cylinder, so that the installation cover and the installation cylinder become a whole, the installation cylinder is placed inside the drainage cylinder, and the sealing cover is covered. At this time, the two positioning frames are respectively abutted against the inner top wall of the drainage cylinder and the inner bottom wall of the sealing cover. When water enters the drainage cylinder through the circulation pipe, it enters the positioning frame through the setting of the drainage groove. The water entering the positioning frame will be filtered by the filter element and discharged into the drainage pipe, which is convenient for replacing the filter element and does not affect the circulation of water.

[0049] 2. In the present invention, during the cooling process, as the motor body runs, the first bevel gear can be driven to rotate, and the first bevel gear can drive the rotating shell to rotate through the second bevel gear, thereby starting cooling. At the same time, the second bevel gear drives the third bevel gear to rotate, and the third bevel gear drives the exhaust fan to rotate, thereby realizing air circulation in the motor shell, and the flow rate of water in the spiral tube and the flow rate of air in the motor shell will change with the change of the power of the motor body, thereby automatically cooling the motor body according to its operating status under different conditions, reducing energy consumption and improving cooling efficiency.

[0050] 3. In the present invention, by cooperating with the cooling component and the driving component, the cooling effect can be automatically adjusted according to the different states of the motor body, thereby improving the cooling efficiency. By setting the ventilation component, the cooling efficiency is improved, and the occurrence of obstacles during operation caused by overheating of the motor body is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0053] Figure 2 It is a schematic diagram of the overall structure from another angle in the present invention;

[0054] Figure 3 It is a schematic diagram of a three-dimensional structure in cross section in the present invention;

[0055] Figure 4 It is a schematic diagram of the structure of the water outlet pipe, the spiral pipe and the one-way valve in the present invention;

[0056] Figure 5It is a cross-sectional structural schematic diagram of the cooperation of the cooling component, the circulation component, the driving component and the ventilation component in the present invention;

[0057] Figure 6 It is a cross-sectional structural schematic diagram of the cooperation of the circulation component, the driving component and the ventilation component in the present invention;

[0058] Figure 7 It is a cross-sectional structural schematic diagram of the cooperation between the cooling component and the circulation component in the present invention;

[0059] Figure 8 It is a schematic diagram of the structure of the driving assembly and the drainage part in the present invention;

[0060] Fig. 9 It is a schematic diagram of the cross-sectional structure of the drainage part in the present invention;

[0061] Fig.10 It is a schematic diagram of the cross-sectional structure of the filter part in the present invention.

[0062] In the figure: 1. motor housing; 2. motor body; 3. water pump body; 4. water inlet; 5. water outlet; 6. water outlet pipe; 7. joint; 8. spiral tube; 9. one-way valve; 10. circulation pipe; 11. rotating housing; 12. rotating block; 13. circulation fan blades; 14. drainage cylinder; 15. drainage pipe; 16. sealing cover; 17. mounting cylinder; 18. mounting cover; 19. positioning frame; 20. drainage groove; 21. first bevel gear; 22. second bevel gear; 23. air inlet groove; 24. air outlet groove; 25. protective housing; 26. exhaust fan; 27. third bevel gear; 28. exhaust groove; 29. ​​dust plate; 30. filter element. DETAILED DESCRIPTION

[0063] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] like Figures 1 to 10As shown, this embodiment proposes a permanent magnet brushless motor structure based on a water pump, including a motor housing 1, a motor body 2, a water pump body 3, a water inlet 4, a water outlet 5, a cooling component, a circulation component, a driving component and a ventilation component. The motor body 2 is fixedly installed inside the motor housing 1, and the motor body 2 is provided with two output shafts. The water pump body 3 is fixedly installed on the upper part of the motor housing 1. The output shaft of the motor body 2 located at the upper part is fixedly connected to the pump shaft of the water pump body 3. The top of the water pump body 3 is provided with a water inlet 4, and the side of the water pump body 3 is provided with a water outlet 5. The cooling component is installed inside the motor housing 1 for cooling the motor body 2. The cooling component includes a water outlet pipe 6, a joint 7 and a spiral tube 8. The water outlet pipe 6 is connected to the water outlet 5, and the end of the water outlet pipe 6 away from the water outlet 5 is fixedly installed with a joint 7. The spiral tube 8 is fixedly installed inside the motor housing 1, and the spiral tube 8 is in contact with the motor body 2. The input end of the spiral tube 8 is connected to the water outlet pipe 6 through a one-way valve 9.

[0065] Specifically, in the process of using the water pump, the water inlet 4 of the water pump body 3 is first connected to the water source. At this time, the circuit is turned on to drive the two output shafts of the motor body 2 to rotate synchronously. At this time, the motor body 2 can drive the water pump body 3 to draw water out through the water inlet 4, and discharge it into the water outlet pipe 6 through the water outlet 5. The joint 7 is connected to the set pipeline, and the water is discharged into the pipeline and flows to the specified position. As the motor continues to run, the driving component is synchronously driven to move, thereby driving the circulation component to run, and the water discharged from the water outlet 5 and flowing into the water outlet pipe 6 is partially sucked into the spiral tube 8 through the setting of the one-way valve 9, thereby cooling the motor body 2. At the same time, through the setting of the ventilation component, the cooling efficiency is improved, and the occurrence of obstacles during operation caused by overheating of the motor body 2 is reduced.

[0066] The circulation component is installed on the cooling component for heat dissipation. The circulation component includes a circulation pipe 10 and a rotating shell 11. The circulation pipe 10 is fixedly installed on the motor housing 1. One end of the circulation pipe 10 is rotatably and sealedly installed with the rotating shell 11. The rotating shell 11 is rotatably and sealedly connected with the output end that drives the spiral tube 8. It also includes a rotating block 12, a circulation fan blade 13, a drainage part and a filter part. The rotating block 12 is arranged inside the rotating shell 11. The axial position of the rotating block 12 coincides with the axial position of the rotating shell 11. A plurality of circulation fan blades 13 are fixedly installed at equal angles on the rotating block 12. The circulation fan blades 13 are fixedly connected to the inner wall of the rotating shell 11. The drainage part is installed on the motor housing 1 for discharging the water entering the spiral tube 8 back to the outlet pipe 6. The filter part is installed inside the drainage part for filtering the water passing through the spiral tube 8.

[0067] Specifically, when the motor body 2 needs to be cooled, as the motor body 2 continues to run, the rotating shell 11 is driven to rotate. At this time, the rotating shell 11 and the contact position of the circulation pipe 10 and the spiral tube 8 rotate relative to each other, thereby driving the circulation fan blades 13 to rotate, thereby drawing water into the spiral tube 8. The water entering the spiral tube 8 will flow through the rotating shell 11 and the circulation pipe 10 in turn until it enters the drainage part, filters the water through the filter part, and then discharges the water back to the outlet pipe 6 to realize circulation.

[0068] As mentioned above, the drainage part includes a drainage cylinder 14, a drainage pipe 15 and a sealing cover 16. The drainage cylinder 14 is fixedly installed on the motor housing 1. The side of the bottom end of the drainage cylinder 14 is connected to the circulation pipe 10. The drainage pipe 15 is connected to the side of the top end of the drainage cylinder 14. The drainage pipe 15 is connected to the outlet pipe 6 through the one-way valve 9. The sealing cover 16 is detachable and sealed at the bottom of the drainage cylinder 14.

[0069] Specifically, after the water enters the drain tube 14 through the circulation pipe 10, as the water level rises, the water eventually flows back to the outlet pipe 6 through the drain pipe 15. Through the setting of the one-way valve 9, the water entering the spiral tube 8 or being discharged from the drain pipe 15 cannot flow back, thereby improving the cooling efficiency.

[0070] As mentioned above, the filter part includes a mounting cylinder 17, a mounting cover 18, a positioning frame 19, a drainage groove 20 and a filter element 30. The mounting cylinder 17 is detachably mounted inside the drainage cylinder 14. The outer wall of the mounting cylinder 17 slides and seals with the inner wall of the drainage cylinder 14. The top of the mounting cylinder 17 is detachably and sealably mounted with a mounting cover 18. The bottom of the mounting cylinder 17 and the top of the mounting cover 18 are both fixedly mounted with positioning frames 19, wherein the upper positioning frame 19 abuts against the inner top wall of the drainage cylinder 14, and the lower positioning frame 19 abuts against the inner bottom wall of the sealing cover 16. Both positioning frames 19 are provided with a plurality of drainage grooves 20 in a circular shape with equal angles, and the filter element 30 is detachably mounted inside the mounting cylinder 17.

[0071] Specifically, when installing the filter element 30, first prepare the filter element 30 and install the filter element 30 on the installation cylinder 17. At this time, install the installation cover 18 on the top of the installation cylinder 17 so that the installation cover 18 and the installation cylinder 17 become a whole. Put the installation cylinder 17 into the drainage cylinder 14 and cover the sealing cover 16. At this time, the two positioning frames 19 are respectively abutted against the inner top wall of the drainage cylinder 14 and the inner bottom wall of the sealing cover 16. When water enters the drainage cylinder 14 through the circulation pipe 10, it enters the positioning frame 19 through the setting of the drainage groove 20. The water entering the positioning frame 19 will be filtered by the filter element 30 and come to the upper layer inside the drainage cylinder 14, and then it will be discharged into the drainage pipe 15.

[0072] The driving assembly is installed on the output shaft at the bottom of the motor body 2, and is used to drive the circulation assembly to move. The driving assembly includes a first bevel gear 21 and a second bevel gear 22. The output shaft at the bottom of the motor body 2 is fixedly installed with the first bevel gear 21, and the second bevel gear 22 is fixedly installed on the rotating shell 11, and the second bevel gear 22 is meshed with the first bevel gear 21.

[0073] Specifically, during the cooling process, as the motor body 2 runs, the first bevel gear 21 can be driven to rotate, and the first bevel gear 21 can drive the rotating housing 11 to rotate through the second bevel gear 22, thereby starting cooling.

[0074] A ventilation assembly is installed at the bottom of the motor housing 1 for ventilation. The ventilation assembly includes an air inlet slot 23, an air outlet slot 24 and an exhaust part. The motor housing 1 is provided with a plurality of air inlet slots 23 at equal angles in a circular shape. The air inlet slots 23 are located at the upper part of the motor body 2. A plurality of air outlet slots 24 are provided at equal distances at the bottom of the motor housing 1. The exhaust part is installed at the bottom of the motor housing 1 for exhaust.

[0075] Specifically, during the cooling process, as the second bevel gear 22 rotates, the exhaust part is driven to operate, thereby forming a negative pressure inside the motor housing 1, allowing air to enter the motor housing 1 from the air inlet slot 23 and then be discharged from the motor housing 1 through the air outlet slot 24, thereby improving the cooling efficiency.

[0076] As mentioned above, the exhaust part includes a protective shell 25, an exhaust fan 26 and a third bevel gear 27. The protective shell 25 is fixedly installed at the bottom of the motor shell 1, and the exhaust fan 26 is rotatably installed at the bottom of the motor shell 1. The third bevel gear 27 is fixedly installed on the exhaust fan 26. The third bevel gear 27 is meshed with the second bevel gear 22. It also includes an exhaust slot 28 and a dustproof plate 29. A plurality of exhaust slots 28 are equidistantly provided at the bottom of the protective shell 25, and a plurality of dustproof plates 29 are fixedly installed equidistantly inside the protective shell 25. The dustproof plates 29 are located above the exhaust slots 28.

[0077] Specifically, as the second bevel gear 22 rotates, the second bevel gear 22 drives the third bevel gear 27 to rotate, and the third bevel gear 27 drives the exhaust fan 26 to rotate, thereby realizing air circulation in the motor housing 1, improving the cooling efficiency of the motor body 2, and the air discharged from the air outlet slot 24 into the protective housing 25 will be discharged through the exhaust slot 28. Through the setting of the dustproof plate 29, the occurrence of external dust entering the motor housing 1 can be effectively reduced, thereby improving the service life of the motor body 2.

[0078] To sum up, in the process of using the water pump, the water inlet 4 of the water pump body 3 is first connected to the water source. At this time, the circuit is turned on to drive the two output shafts of the motor body 2 to rotate synchronously. At this time, the motor body 2 can drive the water pump body 3 to pump water out through the water inlet 4 and discharge it into the outlet pipe 6 through the water outlet 5. As the motor body 2 continues to run, the first bevel gear 21 can be driven to rotate synchronously, and the first bevel gear 21 can drive the rotating shell 11 to rotate. At this time, the rotating shell 11 and the contact position of the circulation pipe 10 and the spiral tube 8 rotate relative to each other, thereby driving the circulation fan blades 13 to rotate, thereby pumping water into the spiral tube 8. The water entering the spiral tube 8 will flow through the rotating shell 11 and the circulation pipe 10 in turn until it enters the drainage tube 14, thereby achieving cooling of the motor body 2.

[0079] Before filtering the water, install the filter element 30 first. When installing the filter element 30, first prepare the filter element 30 and install it on the installation cylinder 17. At this time, install the installation cover 18 on the top of the installation cylinder 17 so that the installation cover 18 and the installation cylinder 17 become a whole. Put the installation cylinder 17 into the drainage cylinder 14 and cover the sealing cover 16. At this time, the two positioning frames 19 are respectively abutted against the inner top wall of the drainage cylinder 14 and the inner bottom wall of the sealing cover 16. When the water enters the drainage cylinder 14 through the circulation pipe 10, it enters the positioning frame 19 through the setting of the drainage groove 20. The water entering the positioning frame 19 will be filtered by the filter element 30 and come to the upper layer inside the drainage cylinder 14. As the water level rises, the water eventually flows back to the outlet pipe 6 through the setting of the drainage pipe 15. Through the setting of the one-way valve 9, the water entering the spiral tube 8 or being discharged from the drainage pipe 15 cannot flow back, thereby improving the cooling efficiency and realizing circulation.

[0080] At the same time, as the second bevel gear 22 rotates, the second bevel gear 22 drives the third bevel gear 27 to rotate, and the third bevel gear 27 drives the exhaust fan 26 to rotate. At this time, negative pressure is formed inside the motor casing 1, and air enters the motor casing 1 from the air inlet slot 23, and then is discharged from the motor casing 1 through the air outlet slot 24, thereby improving the cooling efficiency, realizing air circulation in the motor casing 1, and improving the cooling efficiency of the motor body 2. The air discharged from the air outlet slot 24 into the protective casing 25 will be discharged through the exhaust slot 28, thereby improving the cooling efficiency and reducing the occurrence of obstacles during operation caused by overheating of the motor body 2.

[0081] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet brushless motor structure based on a water pump, characterized in that: The invention comprises a motor housing (1), a motor body (2), the motor body (2) being fixedly mounted inside the motor housing (1), the motor body (2) being provided with two output shafts, a water pump body (3) being fixedly mounted on the upper part of the motor housing (1), the output shaft of the motor body (2) being located at the upper part being fixedly connected to the pump shaft of the water pump body (3), the water pump body (3) being provided with a water inlet (4) and a water outlet (5), and further comprising: A cooling assembly, the cooling assembly being installed inside the motor housing (1) and being used to cool the motor body (2); A circulation component, the circulation component is installed on the cooling component and is used for heat dissipation; A drive assembly, the drive assembly being mounted on an output shaft located at a lower portion of the motor body (2) and used to drive the circulation assembly to move; A ventilation assembly, the ventilation assembly being mounted on the bottom of the motor housing (1) and being used for ventilation; The cooling assembly comprises: a water outlet pipe (6), the water outlet pipe (6) being connected to the water outlet (5); A joint (7), the joint (7) being fixedly mounted on one end of the water outlet pipe (6) away from the water outlet (5); a spiral tube (8), the spiral tube (8) being fixedly mounted inside the motor housing (1), the spiral tube (8) being in contact with the motor body (2), and the input end of the spiral tube (8) being connected to the water outlet pipe (6) via a one-way valve (9); The loop components include: A circulation pipe (10), wherein the circulation pipe (10) is fixedly mounted on the motor housing (1); A rotating shell (11) is rotatably and sealingly mounted on one end of the circulation tube (10), and the rotating shell (11) is rotatably and sealingly connected to the output end of the driving spiral tube (8).

2. A permanent magnet brushless motor structure based on a water pump according to claim 1, characterized in that: Also includes: A rotating block (12), the rotating block (12) being arranged inside the rotating housing (11), the axis position of the rotating block (12) being coincident with the axis position of the rotating housing (11); Circulating blades (13), a plurality of circulating blades (13) are fixedly mounted at equal angles on the rotating block (12), and the circulating blades (13) are fixedly connected to the inner wall of the rotating housing (11); a drainage portion, the drainage portion being mounted on the motor housing (1) and used to drain water entering the spiral tube (8) back to the water outlet pipe (6); A filter unit is installed inside the drainage unit and is used to filter water passing through the spiral tube (8).

3. A permanent magnet brushless motor structure based on a water pump according to claim 2, characterized in that: The drainage part comprises: A drainage cylinder (14), the drainage cylinder (14) being fixedly mounted on the motor housing (1), and the side portion of the bottom end of the drainage cylinder (14) being in communication with the circulation pipe (10); A drainage pipe (15), the drainage pipe (15) being connected to the side portion of the top end of the drainage cylinder (14), the drainage pipe (15) being connected to the water outlet pipe (6) via the one-way valve (9); A sealing cover (16), wherein the sealing cover (16) is detachable and sealingly mounted on the bottom of the drainage cylinder (14).

4. A permanent magnet brushless motor structure based on a water pump according to claim 3, characterized in that: The filter unit comprises: An installation cylinder (17), the installation cylinder (17) being detachably installed inside the drainage cylinder (14), the outer wall of the installation cylinder (17) slidingly and sealingly fitting with the inner wall of the drainage cylinder (14); An installation cover (18), the installation cover (18) being detachably and sealingly installed on the top of the installation cylinder (17); A positioning frame (19), the positioning frame (19) being fixedly mounted on the bottom of the mounting tube (17) and the top of the mounting cover (18); The upper positioning frame (19) abuts against the inner top wall of the drainage cylinder (14), and the lower positioning frame (19) abuts against the inner bottom wall of the sealing cover (16); Drainage grooves (20), a plurality of drainage grooves (20) are provided on the two positioning frames (19) at equal angles in a circular shape.

5. A permanent magnet brushless motor structure based on a water pump according to claim 4, characterized in that: The drive assembly comprises: A first bevel gear (21), the output shaft at the bottom of the motor body (2) being fixedly mounted with the first bevel gear (21); A second bevel gear (22), wherein the second bevel gear (22) is fixedly mounted on the rotating housing (11), and the second bevel gear (22) is meshed with the first bevel gear (21).

6. A permanent magnet brushless motor structure based on a water pump according to claim 5, characterized in that: The ventilation assembly comprises: Air inlet slots (23), a plurality of the air inlet slots (23) are provided on the motor housing (1) at equal angles in a circular shape, and the air inlet slots (23) are located on the upper part of the motor body (2); Air outlet slots (24), a plurality of the air outlet slots (24) being provided at equal intervals on the bottom of the motor housing (1); An exhaust part is installed at the bottom of the motor housing (1) and is used for exhausting air.

7. A permanent magnet brushless motor structure based on a water pump according to claim 6, characterized in that: The exhaust part comprises: A protective housing (25), the protective housing (25) being fixedly mounted on the bottom of the motor housing (1); An exhaust fan (26), the exhaust fan (26) being rotatably mounted on the bottom of the motor housing (1); A third bevel gear (27), the third bevel gear (27) being fixedly mounted on the exhaust fan (26), the third bevel gear (27) being meshed with the second bevel gear (22).

8. A permanent magnet brushless motor structure based on a water pump according to claim 7, characterized in that: Also includes: Exhaust slots (28), a plurality of exhaust slots (28) being provided at equal intervals on the bottom of the protective housing (25); Dustproof plates (29), a plurality of dustproof plates (29) are fixedly installed at equal intervals inside the protective shell (25), and the dustproof plates (29) are located above the exhaust slot (28).

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