Electronic water pump

Abstract

The utility model provides an electronic water pump which comprises a pump body and a rotor. The rotor is contained in the pump body, the rotor can rotate around a rotating axis relative to the pump body, the rotor comprises an impeller and a rotor magnet, and the impeller and the rotor magnet are combined together to rotate synchronously. The electronic water pump further comprises a first stator and a second stator, the first stator is located on the side, facing the impeller, of the rotor magnet in the extending direction of the rotating axis and located between the rotor magnet and the impeller, and the second stator is located on the side, facing the impeller, of the rotor magnet in the extending direction of the rotating axis. The second stator is located on the side, opposite to the impeller, of the rotor magnet in the extending direction of the rotating axis, and the first stator and the second stator generate a rotating magnetic field acting on the rotor magnet when powered on so as to drive the rotor to rotate. By arranging the rotor magnet between the first stator and the second stator, the electromagnetic force of the magnetic field on the rotor magnet can be effectively enhanced, and the torque output of the rotor is increased, so that the output torque of the electronic water pump is improved, and the electronic water pump adapts to application scenes with high torque requirements.

Description

Technical Field

[0001] The utility model relates to the field of water pumps, in particular to an electronic water pump. Background Art

[0002] An electronic water pump converts electrical energy into mechanical energy to transport fluids. It consists of a rotor and a stator. The rotor consists of a rotor magnet and an impeller. When energized, the stator generates a rotating magnetic field that acts on the rotor magnet, driving the rotor. The impeller's rotation generates centrifugal force that propels the fluid.

[0003] Torque is a crucial parameter for the operation of electronic water pumps. The magnitude of torque directly impacts the pump's starting ability and delivery efficiency. High torque overcomes fluid resistance, ensuring smooth operation, especially in high-flow or high-head applications. Insufficient torque can cause the pump to experience difficulty starting or inefficiency. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides an electronic water pump, aiming to improve the output torque of the electronic water pump.

[0005] The electronic water pump provided by the present disclosure includes a pump body and a rotor. The rotor is housed within the pump body and is rotatable relative to the pump body about a rotation axis. The rotor includes an impeller and a rotor magnet. The impeller and the rotor magnet are combined to rotate synchronously. The impeller and the rotor magnet are spaced apart in the direction in which the rotation axis extends. The electronic water pump also includes a first stator and a second stator. The first stator is located on a side of the rotor magnet that faces the impeller in the direction in which the rotation axis extends and is located between the rotor magnet and the impeller. The second stator is located on a side of the rotor magnet that faces away from the impeller in the direction in which the rotation axis extends. When energized, the first stator and the second stator generate a rotating magnetic field that acts on the rotor magnet to drive the rotor to rotate.

[0006] Compared to a single stator, two stators work together to generate a rotating magnetic field, providing a greater electromagnetic force. With this configuration, the rotor magnets are positioned between the first and second stators. This effectively enhances the electromagnetic force exerted by the magnetic field on the rotor magnets, thereby increasing the rotor's torque output. This implementation improves the output torque of the electronic water pump, making it suitable for applications requiring high torque.

[0007] As a possible implementation method, the pump body includes a first pump body part and a second pump body part, the first pump body part covers the first stator, and the second pump body part covers the second stator. The first pump body part and the second pump body part are assembled together along the extension direction of the rotation axis to form a first chamber for accommodating the rotor magnet between the first stator and the second stator.

[0008] The first stator and the second stator are respectively enclosed within the first pump body and the second pump body, isolating the first stator and the second stator from the fluid medium to ensure the electrical safety of the stators during operation. On the other hand, if the pump body enclosing the first and second stators were integrally formed, and the first chamber was formed between the first and second stators, it would be difficult to install the rotor magnet within the first chamber. According to the above implementation, the first pump body, the rotor magnet, and the second pump body can be assembled along the extension direction of the rotation axis, reducing the difficulty of assembling the electronic water pump.

[0009] As a possible implementation, the electronic water pump further includes a first electrical connector, which extends from the inside of the first pump body, through the outer peripheral side of the rotor magnet, to the inside of the second pump body to electrically connect the first stator and the second stator.

[0010] Since the first electrical connector is located on the outer circumference of the rotor magnet, it is possible to avoid interference with the rotor magnet while electrically connecting the first stator and the second stator.

[0011] As a possible implementation, the electronic water pump further includes a barrier member, which forms a barrier channel between the first pump body and the second pump body to block entry of the fluid medium, and the first electrical connector extends through the barrier channel.

[0012] By extending the first electrical connector in the blocking channel, the first electrical connector can be isolated from the fluid medium between the first pump body portion and the second pump body portion, thereby ensuring the safety and reliability of the electrical connection.

[0013] As one possible implementation, a second chamber is defined on the side of the first pump body facing away from the second pump body. The first pump body is provided with a through-hole on the inner circumference of the first stator. The diameter of the through-hole is smaller than the diameters of the impeller and the rotor magnet. The rotor further includes a connecting portion, one end of which extends into the second chamber to connect with the impeller, and the other end of which extends through the through-hole into the first chamber to connect with the rotor magnet. At least one of the impeller and the rotor magnet is assembled and connected to the connecting portion.

[0014] Because the diameter of the through-hole is smaller than the diameters of the impeller and the rotor magnet, installing the rotor into the pump body would be difficult if the rotor (i.e., the impeller, rotor magnet, and connecting portion) were formed integrally. According to the above structure, at least one of the impeller and rotor magnet is assembled and connected to the connecting portion. Thus, the connecting portion can be first passed through the through-hole, and then the impeller and / or rotor magnet can be assembled and connected to the connecting portion, thereby achieving installation of the rotor into the pump body. Therefore, this structure helps to reduce the difficulty of assembling the electronic water pump.

[0015] As a possible implementation method, the electronic water pump also includes a retaining ring and a fastener. The connecting part includes a large diameter part and a small diameter part in sequence along the direction away from the impeller. The rotor magnet and the retaining ring are arranged on the small diameter part. The rotor magnet is located between the large diameter part and the retaining ring and is against the two. The fastener fastens the retaining ring to the connecting part.

[0016] Since the rotor magnet is located between the large diameter portion and the retaining ring, the large diameter portion and the retaining ring can limit the displacement of the rotor magnet along the extension direction of the rotation axis, thereby ensuring the stability of the installation.

[0017] As one possible implementation, the outer circumference of the small-diameter portion is provided with a first protrusion and a first recess, the first protrusion and the first recess being aligned along the extension direction of the rotation axis, with the first protrusion being closer to the large-diameter portion than the first recess. A second recess is provided on the inner circumference of the rotor magnet, and a second protrusion is provided on the inner circumference of the retaining ring. The second recess receives the first protrusion, and the first recess receives the second protrusion. The fastener passes through the second protrusion and connects to the first protrusion.

[0018] When the rotor magnet tends to displace about the axis, the second recess of the rotor magnet is restrained by the first protrusion of the smaller diameter portion, preventing the rotor magnet from displacing about the axis. Similarly, when the retaining ring tends to displace about the axis, the second protrusion of the retaining ring is restrained by the first recess of the smaller diameter portion, preventing the retaining ring from displacing about the axis. Furthermore, the second protrusion of the retaining ring radially protrudes beyond the other portions, providing space for fasteners to pass through the second protrusion and connect with the first protrusion. This allows the remaining portions of the retaining ring, excluding the second protrusion, to be constructed with a smaller size about the axis, thereby reducing manufacturing costs.

[0019] As a possible implementation, the electronic water pump further includes a support shaft fixed to the second pump body. The connection portion is provided with a support hole extending along the direction of the rotation axis. The support shaft extends into the support hole to rotatably support the rotor. When the impeller rotates, the fluid medium flows from the outer periphery of the impeller, sequentially through the through hole, the gap between the first pump body and the rotor magnet, the gap between the second pump body and the rotor magnet, and the support hole, and then back to the center of the impeller.

[0020] According to the above implementation, the fluid medium can fully dissipate heat to the first stator in the first pump body, the second stator in the second pump body and the rotor magnet during the reflux process, thereby ensuring the performance stability of the electronic water pump during operation.

[0021] As a possible implementation method, the electronic water pump also includes a driving circuit board and a second electrical connector. A third chamber for accommodating the driving circuit board is provided on the side of the second pump body facing away from the first pump body. The second electrical connector extends from the third chamber to the interior of the second pump body to electrically connect the driving circuit board with the second stator.

[0022] The third chamber provides an independent protective space for the driving circuit board, preventing the fluid medium from corroding or damaging the driving circuit board, thereby increasing the service life of the driving circuit board.

[0023] As a possible implementation manner, the first stator and the second stator are connected in parallel.

[0024] After the two stators are connected in parallel, the magnetic fields generated by the stators will be superimposed on each other, thereby enhancing the electromagnetic force of the magnetic field on the rotor magnets, thereby increasing the torque output of the rotor.

[0025] As a possible implementation manner, at least one of the first stator and the second stator includes a printed circuit board having a magnetic induction coil and a magnetic conductor, and the magnetic conductor is located on a side of the printed circuit board facing away from the rotor magnet.

[0026] Compared to wound coils, printed circuit boards with magnetic induction coils do not require a large iron core or large amounts of copper wire, thus reducing the coil's axial size and simplifying installation. The presence of a magnetic conductor concentrates and enhances the magnetic field generated by the magnetic induction coil, strengthening the electromagnetic force of the field. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is an exploded schematic diagram of an electronic water pump according to an embodiment of the present invention.

[0028] Figure 2 for Figure 1 Schematic cross-section of the electronic water pump.

[0029] Figure 3 for Figure 1 Exploded diagram of part of the electronic water pump.

[0030] Figure 4 for Figure 1 Schematic cross-sectional view of the first pump body portion.

[0031] Figure 5 for Figure 1 Schematic cross-section of a portion of the electronic water pump.

[0032] Figure 6 for Figure 2 Magnified view of part B.

[0033] Figure 7 for Figure 1 Schematic diagram of the structure of the rotor of the electronic water pump.

[0034] Figure 8 for Figure 1 Schematic diagram of the rotor in the figure.

[0035] Figure 9 for Figure 2 Magnified view of part C in FIG. DETAILED DESCRIPTION

[0036] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described in the specification and illustrated in the accompanying drawings. It is understood that the embodiments described and illustrated herein are non-limiting examples, and thus it is recognized that the specific structural and functional details disclosed herein are representative and exemplary. Modifications and changes may be made to these embodiments without departing from the scope of the claims.

[0037] refer to Figure 1 and Figure 2 The electronic water pump 100 includes a pump body 10, and a rotor 20, a first stator 31, and a second stator 32 housed within the pump body 10. When energized, the first stator 31 and the second stator 32 generate a rotating magnetic field that acts on the rotor 20, driving the rotor 20 to rotate about the rotation axis AA relative to the pump body 10. Specifically, the rotor 20 includes an impeller 21 and a rotor magnet 22. When energized, the rotating magnetic field generated by the first stator 31 and the second stator 32 acts on the rotor magnet 22, driving the rotor magnet 22 to rotate. The impeller 21 and the rotor magnet 22 are combined to achieve synchronous rotation.

[0038] The impeller 21 and the rotor magnet 22 are spaced apart in the extension direction of the rotation axis AA. The first stator 31 is located on the side of the rotor magnet 22 facing the impeller 21 in the extension direction of the rotation axis AA and is located between the rotor magnet 22 and the impeller 21. The second stator 32 is located on the side of the rotor magnet 22 facing away from the impeller 21 in the extension direction of the rotation axis AA. Compared with a single stator, the two stators work together to generate a rotating magnetic field, which can provide a greater electromagnetic force. According to the above structure, the rotor magnet 22 will be located between the first stator 31 and the second stator 32, which can effectively enhance the electromagnetic force of the magnetic field on the rotor magnet 22, thereby increasing the torque output of the rotor 20. According to the above implementation method, the output torque of the electronic water pump 100 can be improved, so that it can adapt to application scenarios with high torque requirements.

[0039] In one possible implementation, the first stator 31 can be connected in parallel with the second stator 32. After the two stators are connected in parallel, the magnetic fields generated by the stators will be superimposed on each other, thereby increasing the electromagnetic force of the magnetic field on the rotor magnet 22, thereby increasing the torque output of the rotor 20.

[0040] Continue to refer Figure 1 and Figure 2At least one of the first stator 31 and the second stator 32 includes a printed circuit board 33 with a magnetic induction coil and a magnetizer 34. The magnetizer 34 is located on the side of the printed circuit board 33 facing away from the rotor magnet 22. As an example, the first stator 31 may include a printed circuit board 33a and a magnetizer 34a, and the second stator 32 may include a printed circuit board 33b and a magnetizer 34b. Compared to wound coils, the printed circuit board 33 with the magnetic induction coil does not require a large iron core and a large amount of copper wire, thereby reducing the axial size of the coil and simplifying the installation process. In addition, the presence of the magnetizer can concentrate and enhance the magnetic field generated by the magnetic induction coil, thereby enhancing the electromagnetic force of the magnetic field.

[0041] It is understood that the magnetic conductor 34 is generally made of a material with high magnetic permeability to effectively guide and concentrate the magnetic field. For example, the magnetic conductor can be selected from materials such as iron, cobalt, nickel, silicon steel alloy, aluminum nickel cobalt alloy, etc.

[0042] refer to Figure 1 and Figure 2 The pump body 10 includes a first pump body portion 11 and a second pump body portion 12. The first pump body portion 11 encloses the first stator 31, and the second pump body portion 12 encloses the second stator 32. The first pump body portion 11 and the second pump body portion 12 are assembled together along the extension direction of the rotation axis AA to form a first chamber 15 for accommodating the rotor magnet 22 between the first stator 31 and the second stator 32. The first stator 31 and the second stator 32 are respectively enclosed in the first pump body portion 11 and the second pump body portion 12, which can isolate the first stator 31 and the second stator 32 from the fluid medium in the pump body 10 to ensure the electrical safety of the stator during operation. On the other hand, if the pump body 10 portion enclosing the first stator 31 and the second stator 32 is formed integrally, and the first chamber 15 is formed between the first stator 31 and the second stator 32, then it will be difficult to install the rotor magnet 22 in the first chamber 15. According to the above implementation, the first pump body 11 , the rotor magnet 22 and the second pump body 12 can be assembled along the extension direction of the rotation axis AA, thereby reducing the difficulty of assembling the electronic water pump 100 .

[0043] refer to Figure 2 and Figure 3 The electronic water pump 100 may further include a first electrical connector 41. The first electrical connector 41 extends from the interior of the first pump body 11, through the outer periphery of the rotor magnet 22, and into the interior of the second pump body 12 to electrically connect the first stator 31 and the second stator 32. Because the first electrical connector 41 is located on the outer periphery of the rotor magnet 22, it can electrically connect the first stator 31 and the second stator 32 while avoiding interference with the rotor magnet 22.

[0044] Continue to refer Figure 2 and Figure 3The electronic water pump 100 may further include a barrier 50, which forms a barrier passage 51 between the first pump body 11 and the second pump body 12 to prevent the fluid medium from entering. The first electrical connector 41 extends through the barrier passage 51. By extending the first electrical connector 41 within the barrier passage 51, the first electrical connector 41 can be isolated from the fluid medium between the first pump body 11 and the second pump body 12, thereby ensuring the safety and reliability of the electrical connection.

[0045] refer to Figure 3 and Figure 4 The second pump body 12 may be provided with a mounting portion 121 open toward the first pump body 11. The barrier 50 may be mounted on the second pump body 12 via the mounting portion 121. After installation, the barrier 50 at least partially protrudes from the second pump body 12. When the first and second pump bodies 11, 12 are assembled, the barrier 50 is squeezed and deformed, forming a blocking passage 51 that prevents the fluid medium from entering.

[0046] It is understood that in order to achieve the above functions, the material of the barrier 50 needs to have good elasticity. For example, the barrier can be selected from materials such as chloroprene rubber, nitrile rubber, polyurethane, etc.

[0047] It is understandable that in some other embodiments, the barrier 50 may also be constructed as a part of the second pump body 12, as long as the portion protruding from the second pump body 12 is elastically deformable.

[0048] Back to Figure 1 and Figure 2 The pump body 10 may further include a first pump cover 13. The first pump body portion 11 and the first pump cover 13 are assembled together along the extension direction of the rotation axis AA, so that a second chamber 16 is defined on the side of the first pump body portion 11 facing away from the second pump body portion 12. An impeller 21 is located in the second chamber 16. The second chamber 16 is provided with an inlet and an outlet (not shown) for a fluid medium. The impeller 21 is capable of guiding the fluid medium to enter from the inlet and, through the centrifugal force generated by its rotation, propels the fluid medium to flow toward the outlet.

[0049] refer to Figure 4 and Figure 5 The first pump body 11 is provided with a through hole 110 on the inner circumference of the first stator 31. The diameter D1 of the through hole 110 is smaller than the diameter D2 of the impeller 21 and the diameter D3 of the rotor magnet 22. Wherein, D2 refers to the maximum diameter of the impeller 21 in the radial direction, and D3 refers to the outer diameter of the rotor magnet 22. Figure 2The rotor 20 may further include a connecting portion 23, one end of which extends to the second chamber 16 to connect with the impeller 21, and the other end of which extends to the first chamber 15 through the through-hole 110 to connect with the rotor magnet 22. At least one of the impeller 21 and the rotor magnet 22 is assembled and connected to the connecting portion 23. Since the diameter of the through-hole 110 is smaller than the diameter of the impeller 21 and the diameter of the rotor magnet 22, if the rotor 20, that is, the impeller 21, the rotor magnet 22 and the connecting portion 23, are integrally formed, it is difficult to install the rotor in the pump body 10. According to the above structure, at least one of the impeller 21 and the rotor magnet 22 is assembled and connected to the connecting portion 23. Accordingly, the connecting portion 23 can be first passed through the through-hole 110, and then the impeller 21 and / or the rotor magnet 22 can be assembled and connected to the connecting portion 23 to achieve the installation of the rotor 20 in the pump body 10. Therefore, this structure helps to reduce the difficulty of assembling the electronic water pump 100 .

[0050] refer to Figure 2 and Figure 6 The electronic water pump 100 may further include a retaining ring 60 and a fastener 70. The connecting portion 23 includes a large diameter portion 231 and a small diameter portion 232 in the direction away from the impeller 21. The rotor magnet 22 and the retaining ring 60 are sleeved on the small diameter portion 232. The rotor magnet 22 is located between the large diameter portion 231 and the retaining ring 60 and abuts against both. The fastener 70 fastens the retaining ring 60 to the connecting portion 23. Because the rotor magnet 22 is located between the large diameter portion 231 and the retaining ring 60, the large diameter portion 231 and the retaining ring 60 can limit the displacement of the rotor magnet 22 along the extension direction of the rotation axis AA, thereby ensuring reliable installation.

[0051] refer to Figure 7 and Figure 8The outer circumferential surface of the small-diameter portion 232 may be provided with a first protrusion 2311 and a first recess 2312. The first protrusion 2311 and the first recess 2312 are aligned along the extending direction of the rotation axis AA, and the first protrusion 2311 is closer to the large-diameter portion 231 than the first recess 2312. The inner circumference of the rotor magnet 22 is provided with a second recess 221, and the inner circumference of the retaining ring 60 is provided with a second protrusion 61. The second recess 221 receives the first protrusion 2311, and the first recess 2312 receives the second protrusion 61. The fastener 70 passes through the second protrusion 61 and is connected to the first protrusion 2311. When the rotor magnet 22 tends to displace in the axial direction, the second recess 221 of the rotor magnet 22 is restrained by the first protrusion 2311 of the small-diameter portion 232, preventing the rotor magnet 22 from displacing in the axial direction. Similarly, when the retaining ring 60 tends to displace in the axial direction, the second protrusion 61 of the retaining ring 60 is restrained by the first recess 2312 of the small-diameter portion 232, preventing the retaining ring 60 from displacing in the axial direction. Furthermore, the second protrusion 61 of the retaining ring 60 radially protrudes beyond the other portions, providing space for the fastener 70 to pass through the second protrusion 61 and connect with the first protrusion 2311. Thus, the remaining portions of the retaining ring 60, excluding the second protrusion 61, can be constructed with a smaller size in the axial direction, thereby reducing manufacturing costs.

[0052] Back to Figure 2 The electronic water pump 100 may further include a support shaft 80 fixed to the second pump body 12, and the connecting portion 23 is provided with a support hole 233 along the extension direction of the rotation axis AA, and the support shaft 80 extends into the support hole 233 to rotatably support the rotor 20. Figure 9 , the path indicated by the arrow in the figure is the return path of the fluid medium. When the impeller 21 rotates, the fluid medium starts from the outer periphery of the impeller 21, passes through the through hole 110, the gap between the first pump body 11 and the rotor magnet 22, the gap between the second pump body 12 and the rotor magnet 22, and the support hole 233, and flows back to the middle part of the impeller 21. According to the above implementation method, the fluid medium can fully dissipate heat to the first stator 31 in the first pump body 11, the second stator 32 in the second pump body 12, and the rotor magnet 22 during the return flow process, so as to ensure the stability of the electronic water pump 100 during operation.

[0053] Back to Figure 1 and Figure 2, the pump body 10 may further include a second pump cover 14. The second pump body portion 12 and the second pump cover 14 are assembled together along the extension direction of the rotation axis AA to form a third chamber 17 on the side of the second pump body portion 12 facing away from the first pump body portion 11. The electronic water pump 100 may further include a driving circuit board 90 and a second electrical connector 42. The second electrical connector 42 extends from the third chamber 17 to the interior of the second pump body 10 to electrically connect the driving circuit board 90 to the second stator 32. The third chamber 17 provides an independent protective space for the driving circuit board 90 to prevent the fluid medium from corroding or damaging the driving circuit board 90, thereby improving the service life of the driving circuit board 90.

[0054] It should be understood that the term "including" and its variations used in the embodiments of the present invention are open-ended, i.e., "including but not limited to." The term "according to" means "at least in part according to." The term "one embodiment" means "at least one embodiment," and the term "another embodiment" means "at least another embodiment." The term "plurality" means "more than one," which is intended to cover two, three, or more embodiments.

[0055] It should be understood that although the terms "first" or "second" etc. may be used in embodiments of the present invention to describe various elements, such as a first chamber and a second chamber, these elements are not defined by these terms, which are merely used to distinguish one element from another.

[0056] The scope of protection of the embodiments of the present invention is not limited to the above-mentioned embodiments. Any changes or substitutions that can be imagined by a person skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included in the scope of protection of the embodiments of the present invention. Therefore, the scope of protection of the embodiments of the present invention should be based on the scope of protection of the claims.

Claims

1. An electronic water pump comprising a pump body and a rotor, the rotor being housed in the pump body and rotatable relative to the pump body about a rotation axis, the rotor comprising an impeller and a rotor magnet, the impeller and the rotor magnet being combined to rotate synchronously, characterized in that: The impeller and the rotor magnet are spaced apart in the extension direction of the rotation axis. The electronic water pump also includes a first stator and a second stator. The first stator is located on the side of the rotor magnet facing the impeller in the extension direction of the rotation axis and is located between the rotor magnet and the impeller. The second stator is located on the side of the rotor magnet facing away from the impeller in the extension direction of the rotation axis. When the first stator and the second stator are energized, a rotating magnetic field acting on the rotor magnet is generated to drive the rotor to rotate.

2. The electronic water pump according to claim 1, characterized in that: The pump body includes a first pump body portion and a second pump body portion, the first pump body portion covers the first stator, and the second pump body portion covers the second stator. The first pump body portion and the second pump body portion are assembled together along the extension direction of the rotation axis to form a first chamber between the first stator and the second stator to accommodate the rotor magnet.

3. The electronic water pump according to claim 2, characterized in that: The pump further includes a first electrical connector extending from the inside of the first pump body, through the outer peripheral side of the rotor magnet, to the inside of the second pump body, so as to electrically connect the first stator and the second stator.

4. The electronic water pump according to claim 3, characterized in that: The pump further includes a barrier member, wherein the barrier member forms a barrier passage between the first pump body portion and the second pump body portion to block entry of a fluid medium, and the first electrical connector extends through the barrier passage.

5. The electronic water pump according to claim 2, characterized in that: A second chamber is provided on a side of the first pump body away from the second pump body, and a through hole is provided on the inner circumference of the first stator of the first pump body, wherein the diameter of the through hole is smaller than the diameter of the impeller and the diameter of the rotor magnet; The rotor also includes a connecting portion, one end of which extends to the second chamber to be connected to the impeller, and the other end of which extends to the first chamber through the through hole to be connected to the rotor magnet, and at least one of the impeller and the rotor magnet is assembled and connected to the connecting portion.

6. The electronic water pump according to claim 5, characterized in that: It also includes a retaining ring and a fastener. The connecting portion includes a large diameter portion and a small diameter portion in sequence along the direction away from the impeller. The rotor magnet and the retaining ring are sleeved on the small diameter portion. The rotor magnet is located between the large diameter portion and the retaining ring and abuts against the two. The fastener fastens the retaining ring to the connecting portion.

7. The electronic water pump according to claim 6, characterized in that: The outer peripheral surface of the small diameter portion is provided with a first convex portion and a first concave portion, the first convex portion and the first concave portion are arranged along the extending direction of the rotation axis, and the first convex portion is closer to the large diameter portion than the first concave portion; The inner periphery of the rotor magnet is provided with a second recess, the inner periphery of the retaining ring is provided with a second protrusion, the second recess receives the first protrusion, the first recess receives the second protrusion, and the fastener passes through the second protrusion and is connected to the first protrusion.

8. The electronic water pump according to claim 5, characterized in that: It also includes a support shaft fixed to the second pump body, the connecting portion is provided with a support hole along the extending direction of the rotation axis, the support shaft extends into the support hole to rotatably support the rotor; When the impeller rotates, the fluid medium flows from the outer periphery of the impeller through the through hole, the gap between the first pump body and the rotor magnet, the gap between the second pump body and the rotor magnet, and the support hole, and then flows back to the middle of the impeller.

9. The electronic water pump according to claim 2, characterized in that: It also includes a driving circuit board and a second electrical connector. A third chamber for accommodating the driving circuit board is provided on the side of the second pump body facing away from the first pump body. The second electrical connector extends from the third chamber to the interior of the second pump body to electrically connect the driving circuit board with the second stator.

10. The electronic water pump according to any one of claims 1 to 9, characterized in that: The first stator and the second stator are connected in parallel; and / or at least one of the first stator and the second stator includes a printed circuit board having a magnetic induction coil and a magnetic conductor, and the magnetic conductor is located on a side of the printed circuit board facing away from the rotor magnet.

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