Electronic water pump with magnetic coupling cooling fan

Abstract

The application relates to the technical field of electronic water pumps, and particularly discloses an electronic water pump with a magnetic coupling heat dissipation fan, which comprises a pump shell, a front cover and a rear cover which are respectively arranged on the two sides of the pump shell, a stator which is fixedly arranged on the inner side of the pump shell, a transmission shaft which is arranged in the pump shell, a rotor which is arranged on the outer side of the transmission shaft, an impeller which is arranged on the front end of the transmission shaft, a water-proof sleeve which is arranged between the outer side of the rotor and the inner side of the stator, a baffle which is fixedly arranged on the inner side of the rear cover, a rear end bearing of the transmission shaft which is connected to the baffle, an arc-shaped groove which is arranged on the inner side of the rear cover, and two arc-shaped grooves. The electronic water pump does not need additional power supply during heat dissipation, does not cause the controller to bear a large load, does not damage the sealing performance of the electronic water pump during heat dissipation, and is beneficial to guaranteeing the stability of the electronic water pump.

Description

Technical Field

[0001] This invention relates to the field of electronic water pump technology, specifically to an electronic water pump with a magnetically coupled cooling fan. Background Technology

[0002] The three-electric system of new energy vehicles has stringent requirements for thermal management and electromagnetic compatibility. Traditional electronic water pumps are prone to electromagnetic interference and have insufficient sealing reliability, which affects the safety and stability of the whole vehicle. Shielded electronic water pumps can suppress interference, improve sealing performance and lifespan, and have become a key component of thermal management system.

[0003] The core advantage of shielded electric water pumps lies in their shaftless, fully sealed structure. By isolating the motor rotor from the stator through the shielding sleeve, zero leakage of the conveyed medium is achieved. Therefore, they are widely used in working conditions with extremely high requirements for sealing performance, such as corrosive, flammable and explosive, and clean environments.

[0004] However, due to the compact structure of the canned motor pump, its motor and controller usually dissipate heat through natural heat dissipation without a dedicated active cooling mechanism. In actual operation, when the electric water pump operates under high load for a long time, the heat generated by the motor and controller will increase significantly. If the heat cannot be dissipated in time, the temperature of the motor and controller will continue to rise, which will not only greatly reduce the operating efficiency of the motor and increase energy consumption, but also cause the motor coil to burn out and the controller to be damaged in severe cases, leading to the failure of the entire electric water pump, affecting the normal operation of the equipment, and even causing safety hazards.

[0005] To solve the aforementioned heat dissipation problem, existing technologies typically employ active cooling by adding a centrifugal fan between the motor and the water jacket to accelerate heat dissipation and prevent overheating of the motor and controller. However, this technical solution has significant drawbacks:

[0006] Centrifugal fans require additional power to drive. If the power is drawn from the pump's own controller, it will increase the load on the controller and further increase the heat generated by the controller, creating a contradiction between "heat dissipation and energy consumption". If an independent power supply device is used, it will increase the structural complexity and manufacturing cost of the equipment. At the same time, the traditional centrifugal fan drive requires the motor shaft to extend to the fan position and a hole to be drilled in the rear of the pump housing for the motor shaft to pass through. This will destroy the fully sealed structure of the shielded electronic water pump, leading to the risk of leakage of the transported medium, which violates the core advantage of zero leakage of the shielded pump and cannot meet the use requirements of harsh working conditions such as corrosive, flammable and explosive environments.

[0007] Therefore, an electronic water pump with a magnetically coupled cooling fan is needed to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide an electronic water pump with a magnetically coupled cooling fan to solve the problem mentioned in the background art that existing electronic water pumps require additional power or increase the load on the controller when cooling.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An electronic water pump with a magnetically coupled cooling fan includes a pump housing and a front cover and a rear cover respectively mounted on both sides thereon. A stator is fixedly mounted on the inner side of the pump housing, a drive shaft is installed inside the pump housing, a rotor is mounted on the outer side of the drive shaft, an impeller is mounted at the front end of the drive shaft, and the impeller is disposed inside the front cover. A water-proof sleeve is provided between the outer side of the rotor and the inner side of the stator. A baffle is fixedly mounted on the inner side of the rear cover, and a bearing at the rear end of the drive shaft is connected to the baffle. Two arc-shaped grooves are provided on the inner side of the rear cover. The sides extend to the outer side of the rear cover through air inlet and exhaust vents respectively. A support plate is fixedly connected inside the rear cover. A mounting plate is fixedly connected to the support plate through protrusions. A heat dissipation mechanism is mounted on the mounting plate. The heat dissipation mechanism includes a mounting plate connected to the mounting plate. The mounting plate is connected to the drive shaft through a magnetic coupling mechanism. The magnetic coupling mechanism includes a back iron fixedly connected coaxially to the outside of the drive shaft. The air inlet and exhaust vents are connected to the mounting plate through an adaptive opening and closing mechanism. The adaptive opening and closing mechanism includes a sealing plate provided inside the air inlet and exhaust vents.

[0011] Preferably, the air inlet and air outlet are connected to the sealing plate via a sliding assembly. The sliding assembly includes an arc-shaped groove and an arc-shaped slide bar. The arc-shaped slide bar on the sliding assembly is disposed on the side of the sealing plate facing the inside of the rear cover. The arc of the arc-shaped groove is not less than twice the arc of the sealing plate. The arc-shaped groove and the sealing plate are movably engaged. The arc-shaped groove on the sliding assembly is disposed on the inner side of the arc-shaped groove.

[0012] Preferably, the heat dissipation mechanism further includes air guide vanes evenly distributed on the outside of the mounting plate. The mounting plate is disposed through the mounting plate via its shaft end bearing. A volute is mounted on the mounting plate. One end of the volute opens towards the air guide vanes, and the other end of the volute opens towards the exhaust port.

[0013] Preferably, the magnetic coupling mechanism further includes a groove on the surface of the mounting plate, the groove being coaxial with the mounting plate, a conical sleeve coaxial with the groove being fixedly installed inside the groove, a support plate being connected to the inner side of the groove, three strip-shaped grooves being equally spaced on the inner side of the groove, each strip-shaped groove having a corresponding sliding block slidably connected in it, the three sliding blocks being equally spaced and fixedly connected to the outer side of the support plate, and a copper disc shaft end coaxial with the support plate being passed through by a bearing on the support plate, a frustum block matching the conical sleeve being installed on the shaft end of the copper disc, a memory alloy spring sleeved on the outer side of the copper disc being provided between the inner bottom surface of the groove and the support plate, and heat-conducting holes passing through both sides of the support plate being equally spaced.

[0014] Preferably, the back iron has a disc-shaped structure, and permanent magnets are arranged at equal angles on the side of the back iron. The magnetic poles of adjacent permanent magnets are opposite on their outer surfaces. Copper blocks are evenly distributed on the side of the copper disc facing the baffle, and the copper blocks are arranged corresponding to the permanent magnets.

[0015] Preferably, the adaptive opening and closing mechanism further includes a rotary groove provided inside the mounting plate, and a through groove extending through the shaft end of the mounting plate to the rotary groove. A pressure guiding assembly is connected in the through groove. The pressure guiding assembly consists of a piston block and a transmission rod. The piston block is slidably connected in the through groove, and the transmission rod is coaxially and bearing-connected to the piston block. The transmission rod extends through the shaft end of the mounting plate. A rubber ring is provided on the outside of the piston block to fill the gap between the piston block and the inside of the through groove. The piston block and the rotary groove are filled with hydraulic oil with a volume smaller than its capacity.

[0016] Preferably, a limiting component is connected to the piston block. The limiting component extends movably to the outside of the mounting disc shaft end. The limiting component consists of an annular disc and rods distributed at equal angles between the annular disc and the piston block. The annular disc is movably penetrated by a transmission rod. The annular disc and the piston block are coaxially arranged. The rods slide through the mounting disc shaft end.

[0017] Preferably, the support plate is provided with a through hole for guiding the transmission rod, the transmission rod is movably inserted through the through hole, and a support seat is provided on the side of the support plate facing away from the mounting plate. There are two support seats, and each support seat is axially connected to a rocker arm. The transmission rod passes through to the end of the support plate facing away from the mounting plate and is fixedly connected to a support block coaxial with it. The two ends of the support block are respectively axially connected to one end of the two rocker arms.

[0018] Preferably, a mounting column is movably passed through the support plate and the mounting plate, and the mounting column is centrally symmetrically arranged in the structure formed by the support plate and the mounting plate. A drive rod perpendicular to the front end of the mounting column is fixedly connected. Each sealing plate is provided with an inclined arc-shaped guide groove, and a corresponding drive rod end is slidably connected in each arc-shaped guide groove. A connecting seat is fixedly connected to the rear end of the mounting column. A return spring sleeved on the outside of the mounting column is provided between the connecting seat and the support plate. The connecting seat is axially connected to the other end of the corresponding rocker arm.

[0019] Preferably, the ratio of the rotation center of the rocker arm to its two ends is not less than 2, and the distance from the rotation center of the rocker arm to the connecting seat is less than its distance from the support block, in order to reduce the pressure required for the support block to drive the connecting seat to move.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the electronic water pump with magnetically coupled cooling fan does not require additional power supply during heat dissipation, and does not cause the controller to bear a large load. In addition, the heat dissipation process does not damage the sealing performance of the electronic water pump, which helps to ensure the stability of the electronic water pump in use.

[0021] 1. The magnetic coupling transmission structure composed of permanent magnets and copper blocks allows the air guide fins used for heat dissipation of the electronic water pump to rotate without additional power supply. The magnetic coupling transmission structure can greatly reduce the load on the controller, which is conducive to ensuring the normal and stable operation of the electronic water pump. In addition, since the magnetic coupling transmission structure is a non-contact transmission structure, it can ensure that the electronic components inside the electronic water pump will not be easily corroded.

[0022] 2. The transmission structure consisting of a conical sleeve and a frustum block, and the support structure consisting of a support plate and a shape memory alloy spring, ensure that the air guide vane will not rotate with the transmission shaft when the internal temperature of the electronic water pump is low, thereby reducing the load on the controller and helping to reduce the difficulty of starting the electronic water pump.

[0023] 3. During the high-speed rotation of the air guide vane with the mounting plate, centrifugal force drives the pressure guiding component upward, which in turn drives the mounting column upward via the support block and rocker arm. This, in turn, drives the sealing plate to rotate via the drive rod and arc-shaped guide groove. The rotation of the sealing plate opens or closes the air inlet and outlet. Combined with the structure consisting of a memory alloy spring, support plate, conical sleeve, and frustum block, the internal temperature of the electronic water pump is not easily dissipated to the external environment when the temperature is low. This avoids the problem of the internal temperature of the electronic water pump remaining low, which would cause the bearing grease to thicken during use, leading to increased wear and reduced service life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0026] Figure 3 This is a partial top view of the structure of the present invention;

[0027] Figure 4 This is a schematic diagram of a partial explosion structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the oblique sectional view of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged structural diagram of point A in the middle;

[0030] Figure 7 For the present invention Figure 5 Enlarged structural diagram of point B;

[0031] Figure 8 This is a schematic cross-sectional view of the present invention;

[0032] Figure 9 For the present invention Figure 8 Enlarged structural diagram of point C;

[0033] Figure 10 This is a schematic diagram of the connection structure between the copper disk and the volute of the present invention;

[0034] Figure 11 For the present invention Figure 10 A schematic diagram of the structure viewed from below;

[0035] Figure 12 This is a cross-sectional view of the mounting disk of the present invention.

[0036] In the diagram: 1. Front cover; 2. Rear cover; 3. Air inlet; 4. Air outlet; 5. Impeller; 6. Support plate; 7. Mounting plate; 8. Drive shaft; 9. Waterproof sleeve; 10. Rotor; 11. Stator; 12. Baffle; 13. Sliding assembly; 14. Sealing plate; 15. Mounting column; 16. Drive rod; 17. Mounting disc; 18. Rotary groove; 19. Through groove; 20. Pressure guiding assembly; 21. Limiting assembly; 22. Conical sleeve; 23. Frustum block; 24. Copper disc; 25. Support disc; 26. Memory alloy spring; 27. Permanent magnet; 28. Copper block; 29. ​​Air guide vane; 30. Volute; 31. Arc-shaped guide groove; 32. Support block; 33. Rocker arm; 34. Support seat; 35. Connecting seat; 36. Return spring; 37. Pump casing. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-12 The present invention provides the following technical solution:

[0039] Example 1: To address the issue that conventional electronic water pumps require additional power or increased controller load when cooling via a fan, the following technical solution is provided: an electronic water pump with a magnetically coupled cooling fan, comprising a pump housing 37 and a front cover 1 and a rear cover 2 respectively mounted on its two sides. A stator 11 is fixedly mounted inside the pump housing 37, a drive shaft 8 is mounted inside the pump housing 37, a rotor 10 is mounted on the outside of the drive shaft 8, an impeller 5 is mounted at the front end of the drive shaft 8, and the impeller 5 is located inside the front cover 1. A water-resistant sleeve 9 is provided between the outside of the rotor 10 and the inside of the stator 11. The rear cover 2... A baffle 12 is fixedly installed on the inner side. The rear bearing of the drive shaft 8 is connected to the baffle 12. An arc-shaped groove is provided on the inner side of the rear cover 2. There are two arc-shaped grooves. The inner sides of the two arc-shaped grooves are respectively connected to the outer side of the rear cover 2 through the air inlet hole 3 and the air outlet hole 4. A support plate 6 is also fixedly connected inside the rear cover 2. A mounting plate 7 is fixedly connected to the support plate 6 through a protrusion. A heat dissipation mechanism is installed on the mounting plate 7. The heat dissipation mechanism includes a mounting plate 17 connected to the mounting plate 7. The mounting plate 17 is connected to the drive shaft 8 through a magnetic coupling mechanism. The magnetic coupling mechanism includes a back iron fixedly connected to the outer side of the drive shaft 8.

[0040] The air inlet 3 and air outlet 4 are connected to the sealing plate 14 via a sliding assembly 13. The sliding assembly 13 includes an arc-shaped groove and an arc-shaped slide bar. The arc-shaped slide bar on the sliding assembly 13 is located on the side of the sealing plate 14 facing the inner side of the rear cover 2. The curvature of the arc-shaped groove is not less than twice the curvature of the sealing plate 14. The arc-shaped groove and the sealing plate 14 are movably engaged. The arc-shaped groove on the sliding assembly 13 is located on the inner side of the arc-shaped groove (rubber rings are provided at the positions of the arc-shaped groove where the air inlet 3 and air outlet 4 are located). Furthermore, the rubber rings on the air inlet 3 and exhaust 4 have the same shape, and the areas of the air inlet 3 and exhaust 4 are smaller than the area of ​​the rubber rings, so that the side of the sealing plate 14 makes compression contact with the rubber rings, which can completely seal the air inlet 3 and exhaust 4. The heat dissipation mechanism also includes air guide vanes 29 evenly distributed on the outside of the mounting plate 17. The mounting plate 17 is set through the mounting plate 7 through its shaft end bearing. A volute 30 is installed on the mounting plate 7. One end of the volute 30 opens towards the air guide vane 29, and the other end of the volute 30 opens towards the air guide vane 29. The end opening faces the exhaust port 4. The magnetic coupling mechanism also includes a groove on the surface of the mounting plate 17, which is coaxial with the mounting plate 17. A conical sleeve 22, coaxial with the groove, is fixedly installed inside the groove. A support plate 25 is connected to the inner side of the groove. Three strip-shaped sliding grooves are provided at equal angles on the inner side of the groove. A corresponding sliding block is slidably connected in each strip-shaped sliding groove. The three sliding blocks are fixedly connected at equal angles to the outer side of the support plate 25. A bearing on the support plate 25 passes through the end of a copper disc 24, which is coaxial with the support plate 25. A frustoconical block 23 that matches the conical sleeve 22 is installed on the shaft end of the copper disk 24. A memory alloy spring 26 is sleeved on the outside of the copper disk 24 between the inner bottom surface of the groove and the support disk 25. Heat conduction holes that penetrate both sides of the support disk 25 are distributed at equal angles. The back iron is a disc-shaped structure. Permanent magnets 27 are arranged at equal angles on the side of the back iron. The magnetic poles of the outer sides of adjacent permanent magnets 27 are opposite. Copper blocks 28 are evenly distributed on the side of the copper disk 24 facing the baffle 12. The copper blocks 28 are arranged correspondingly to the permanent magnets 27.

[0041] according to Figures 1-9 When in use, the stator 11 is energized to generate a rotating magnetic field. The magnetic force passes through the water-proof sleeve 9 to drive the rotor 10 to rotate synchronously, thereby causing the transmission shaft 8 connected to the rotor 10 to rotate.

[0042] When the drive shaft 8 rotates, one end of it drives the impeller 5 to rotate, thereby achieving the purpose of water delivery. At the same time, the lower end of the drive shaft 8 drives the copper disk 24 to rotate in a non-contact manner through the permanent magnet 27 and the copper block 28. During this process, if the internal temperature of the electronic water pump is low, the memory alloy spring 26 will not contract, thus preventing the conical sleeve 22 and the frustum block 23 from squeezing into contact (the inner side of the conical sleeve 22 and the outer side of the frustum block 23 are both provided with anti-slip rubber pads, so that the two have sufficient friction after squeezing into contact, causing them to rotate synchronously). As a result, the rotation of the copper disk 24 will not drive the mounting plate 17 to rotate. At this time, the mounting plate 17 will not put a load on the drive shaft 8, that is, it will not cause an increase in the load on the controller.

[0043] When the temperature inside the electronic water pump rises, the memory alloy spring 26 contracts, causing the conical sleeve 22 and the frustum block 23 to press against each other, so that the mounting plate 17 rotates synchronously with the copper plate 24, thereby driving the air guide vane 29 to rotate.

[0044] When the air guide vane 29 rotates, it allows the high-temperature air inside the rear cover 2 to pass through the volute 30 and be discharged from the exhaust hole 4. After the air is discharged from the rear cover 2 through the exhaust hole 4, a negative pressure is generated inside the rear cover 2, which causes outside air to enter through the air inlet 3.

[0045] Through the above cycle, the electric water pump can be continuously cooled to prevent it from overheating. In addition, the above process will not damage the sealing of the electric water pump, thereby preventing corrosion of the electronic components inside the electric water pump. During the above process, the rotation of the air guide 29 does not require additional power supply, and the non-contact magnetic coupling structure formed by the permanent magnet 27 and the copper block 28 can reduce the load borne by the controller driving the air guide 29 to rotate.

[0046] Example 2: To address the problem that increased wear and reduced service life of conventional electronic water pumps when used in low-temperature environments, the following technical solution is provided: the air inlet 3 and the air outlet 4 are connected to the mounting plate 17 via an adaptive opening and closing mechanism, which includes a sealing plate 14 disposed inside the air inlet 3 and the air outlet 4.

[0047] The adaptive opening and closing mechanism also includes a rotary groove 18 provided inside the mounting plate 17. A through groove 19 extending through the rotary groove 18 is provided at the shaft end of the mounting plate 17. A pressure guiding assembly 20 is connected within the through groove 19. The pressure guiding assembly 20 consists of a piston block and a transmission rod. The piston block is slidably connected within the through groove 19, and the transmission rod is coaxially and bearing-connected to the piston block. The transmission rod extends through the shaft end of the mounting plate 17. A rubber ring is provided on the outer side of the piston block to fill the gap between the piston block and the inner side of the through groove 19. A wave spring compensation shim is provided inside the rubber ring to allow the rubber ring to move outwards and inwards after wear. Internal expansion prevents gaps between the rubber ring and the through groove 19. The piston block and the rotary groove 18 are filled with hydraulic oil with a volume smaller than its capacity. A limit component 21 is connected to the piston block. The limit component 21 extends movably through to the outside of the shaft end of the mounting plate 17. The limit component 21 consists of an annular disc and rods evenly distributed between the annular disc and the piston block. The annular disc is movably penetrated by a transmission rod. The annular disc and the piston block are coaxially arranged. The rods slide through the shaft end of the mounting plate 17. A hole is provided on the shaft end of the mounting plate 17 for the rods to pass through, and the gap between the hole and the rod is between 0.03-0.05mm. The support plate 6 is provided with... A through hole is provided for guiding the transmission rod, which is movably inserted through the through hole. A support base 34 is provided on the side of the support plate 6 facing away from the mounting plate 7. Two support bases 34 are provided, each with a rocker arm 33 axially connected to it. A support block 32, coaxial with the transmission rod, is fixedly connected to the end of the support plate 6 facing away from the mounting plate 7. Both ends of the support block 32 are axially connected to one end of each of the two rocker arms 33. Mounting posts 15 movably pass through the support plate 6 and the mounting plate 7, and are centrally symmetrically arranged in the structure formed by the support plate 6 and the mounting plate 7. A drive rod perpendicular to the front end of each mounting post 15 is fixedly connected. The moving rod 16, each sealing plate 14 is provided with an inclined arc-shaped guide groove 31, and each arc-shaped guide groove 31 is slidably connected to the end of the corresponding driving rod 16. The rear end of the mounting column 15 is fixedly connected to the connecting seat 35. A return spring 36 is provided between the connecting seat 35 and the support plate 6 and sleeved on the outside of the mounting column 15. The connecting seat 35 is axially connected to the other end of the corresponding rocker arm 33. The ratio of the rotation center of the rocker arm 33 to its two ends is not less than 2, and the distance of the rotation center of the rocker arm 33 from the connecting seat 35 is less than its distance from the support block 32, so as to reduce the pressure required for the support block 32 to drive the connecting seat 35 to move.

[0048] according to Figures 5-12 When in use, because the mounting plate 17 rotates at high speed, the hydraulic oil in the swirling groove 18 and the through groove 19 can move towards the corner of the swirling groove 18 through centrifugal force, thereby generating negative pressure in the through groove 19, causing the piston block on the pressure guiding assembly 20 to move towards the swirling groove 18 under the limiting action of the limiting assembly 21.

[0049] When the piston block on the pressure guiding assembly 20 moves, it will drive the transmission rod connected to the piston block bearing to move synchronously, which in turn can drive the support block 32 to move. During the movement of the support block 32, the rocker arm 33 can be driven to rotate through the support seat 34, so that the connecting seat 35 can gradually approach the support plate 6.

[0050] During the above process, when the connecting seat 35 moves, the mounting column 15 and the drive rod 16 on it will move synchronously, thereby driving the sealing plate 14 to rotate through the arc-shaped guide groove 31. When the sealing plate 14 rotates, it can open the air inlet 3 and the air outlet 4.

[0051] Since the air inlet 3 and air outlet 4 only open when the mounting plate 17 rotates at high speed, the rear cover 2 can be kept in a sealed space in a low-temperature environment, which can prevent the internal temperature of the electronic water pump from dissipating to the external environment too quickly, and help to quickly raise the temperature of the electronic water pump to a suitable operating temperature.

[0052] In addition, it can also prevent the structure inside the back cover 2 from being contaminated or corroded when the electric water pump is not in use.

[0053] All bearings described in this specification are deep groove ball bearings. Any content not described in detail herein is prior art known to those skilled in the art.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electronic water pump with a magnetically coupled cooling fan, comprising a pump housing (37) and a front cover (1) and a rear cover (2) respectively mounted on both sides thereof, characterized in that: A stator (11) is fixedly installed on the inner side of the pump casing (37). A drive shaft (8) is installed inside the pump casing (37). A rotor (10) is installed on the outer side of the drive shaft (8). An impeller (5) is installed at the front end of the drive shaft (8). The impeller (5) is located inside the front cover (1). A water-proof sleeve (9) is provided between the outer side of the rotor (10) and the inner side of the stator (11). A baffle (12) is fixedly installed on the inner side of the rear cover (2). The rear end bearing of the drive shaft (8) is connected to the baffle (12). An arc-shaped groove is provided on the inner side of the rear cover (2). There are two arc-shaped grooves. The inner sides of the two arc-shaped grooves are respectively connected to an air inlet (3) and an air outlet (4). A support plate (6) is fixedly connected inside the back cover (2) to the outside of the back cover (2). A mounting plate (7) is fixedly connected to the support plate (6) by a protrusion. A heat dissipation mechanism is installed on the mounting plate (7). The heat dissipation mechanism includes a mounting plate (17) connected to the mounting plate (7). The mounting plate (17) is connected to the drive shaft (8) by a magnetic coupling mechanism. The magnetic coupling mechanism includes a back iron fixedly connected to the outside of the drive shaft (8) on the same axis. The air inlet (3) and the air outlet (4) are connected to the mounting plate (17) by an adaptive opening and closing mechanism. The adaptive opening and closing mechanism includes a sealing plate (14) provided inside the air inlet (3) and the air outlet (4).

2. The electronic water pump with a magnetically coupled cooling fan according to claim 1, characterized in that: The air inlet (3) and air outlet (4) are connected to the sealing plate (14) via a sliding assembly (13). The sliding assembly (13) includes an arc-shaped groove and an arc-shaped slide bar. The arc-shaped slide bar on the sliding assembly (13) is located on the side of the sealing plate (14) facing the inner side of the rear cover (2). The arc of the arc groove is not less than twice the arc of the sealing plate (14). The arc groove and the sealing plate (14) are movably engaged. The arc-shaped groove on the sliding assembly (13) is located on the inner side of the arc groove.

3. An electronic water pump with a magnetically coupled cooling fan according to claim 1, characterized in that: The heat dissipation mechanism also includes air guide vanes (29) evenly distributed on the outside of the mounting plate (17). The mounting plate (17) is set through the mounting plate (7) by its shaft end bearing. A volute (30) is installed on the mounting plate (7). One end of the volute (30) opens towards the air guide vane (29), and the other end of the volute (30) opens towards the exhaust hole (4).

4. An electronic water pump with a magnetically coupled cooling fan according to claim 1, characterized in that: The magnetic coupling mechanism also includes a groove on the surface of the mounting plate (17), the groove being coaxial with the mounting plate (17), a conical sleeve (22) coaxial with it being fixedly installed inside the groove, a support plate (25) being connected to the inner side of the groove, three strip-shaped grooves being provided at equal angles on the inner side of the groove, a corresponding sliding block being slidably connected in each strip-shaped groove, the three sliding blocks being fixedly connected at equal angles to the outer side of the support plate (25), and a bearing on the support plate (25) having a copper plate (24) shaft end coaxial with it being installed through the bearing, a frustum block (23) matching the conical sleeve (22) being installed on the shaft end of the copper plate (24), a memory alloy spring (26) being sleeved on the outer side of the copper plate (24) being provided between the inner bottom surface of the groove and the support plate (25), and heat conduction holes penetrating both sides of the support plate (25) being distributed at equal angles.

5. An electronic water pump with a magnetically coupled cooling fan according to claim 4, characterized in that: The back iron is a disc-shaped structure. Permanent magnets (27) are arranged at equal angles on the side of the back iron. The magnetic poles of the outer sides of adjacent permanent magnets (27) are opposite. Copper blocks (28) are evenly distributed on the side of the copper disk (24) facing the baffle (12). The copper blocks (28) are arranged corresponding to the permanent magnets (27).

6. An electronic water pump with a magnetically coupled cooling fan according to claim 5, characterized in that: The adaptive opening and closing mechanism also includes a rotary groove (18) provided inside the mounting plate (17). The shaft end of the mounting plate (17) is provided with a through groove (19) that extends through the rotary groove (18). A pressure guiding assembly (20) is connected inside the through groove (19). The pressure guiding assembly (20) is composed of a piston block and a transmission rod. The piston block is slidably connected inside the through groove (19). The transmission rod is coaxially and bearing-connected to the piston block. The transmission rod extends through the shaft end of the mounting plate (17). A rubber ring is provided on the outside of the piston block to fill the gap between the piston block and the inside of the through groove (19). The piston block and the rotary groove (18) are filled with hydraulic oil with a volume smaller than its capacity.

7. An electronic water pump with a magnetically coupled cooling fan according to claim 6, characterized in that: A limiting component (21) is connected to the piston block. The limiting component (21) extends movably through to the outside of the shaft end of the mounting plate (17). The limiting component (21) consists of an annular disk and rods distributed at equal angles between the annular disk and the piston block. The annular disk is movably penetrated by a transmission rod. The annular disk and the piston block are coaxially arranged. The rods slide through the shaft end of the mounting plate (17).

8. An electronic water pump with a magnetically coupled cooling fan according to claim 7, characterized in that: The support plate (6) is provided with a through hole for guiding the transmission rod. The transmission rod is movably connected through the through hole. The side of the support plate (6) facing away from the mounting plate (7) is provided with a support seat (34). There are two support seats (34). Each support seat (34) is axially connected with a rocker arm (33). The transmission rod passes through to the end of the support plate (6) facing away from the mounting plate (7) and is fixedly connected with a support block (32) coaxial with it. The two ends of the support block (32) are respectively axially connected to one end of the two rocker arms (33).

9. An electronic water pump with a magnetically coupled cooling fan according to claim 8, characterized in that: Mounting columns (15) are movably connected through the support plate (6) and mounting plate (7), and the mounting columns (15) are centrally symmetrically arranged on the structure formed by the support plate (6) and mounting plate (7). The front end of the mounting column (15) is fixedly connected to a driving rod (16) perpendicular to it. Each sealing plate (14) is provided with an inclined arc-shaped guide groove (31). The end of the corresponding driving rod (16) is slidably connected in each arc-shaped guide groove (31). A connecting seat (35) is fixedly connected to the rear end of the mounting column (15). A return spring (36) sleeved on the outside of the mounting column (15) is provided between the connecting seat (35) and the support plate (6). The connecting seat (35) is axially connected to the other end of the corresponding rocker arm (33).

10. An electronic water pump with a magnetically coupled cooling fan according to claim 9, characterized in that: The ratio of the rotation center of the rocker arm (33) to its two ends is not less than 2, and the distance from the rotation center of the rocker arm (33) to the connecting seat (35) is less than the distance from it to the support block (32), which is used to reduce the pressure required for the support block (32) to drive the connecting seat (35) to move.

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