Electronic water pump with rotor axial limiting structure

Abstract

The utility model discloses an electronic water pump with a rotor axial limiting structure, which relates to the technical field of electronic water pumps and parts thereof, and comprises a pump shell component, a pump cover component, a rotor component, a rotating shaft, an impeller group and a stator component, thrust-limiting parts are respectively arranged at two axial end parts of the rotor assembly; the thrust-limiting part of the rotor assembly can abut against a structure / part in the rotor cavity, or the thrust-limiting part of the rotor assembly is close to the structure / part in the rotor cavity. The utility model mainly solves the problem of how to provide an axial limiting structure for the rotor assembly of the electronic water pump. According to the electronic water pump, the two ends of the stator assembly can be effectively and axially limited respectively, so that axial movement of the stator assembly is limited, the stator assembly, the thrust washer and other parts of the electronic water pump are prevented from being worn or damaged, the performance and stability of the electronic water pump are improved, and the service life of the electronic water pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic water pumps and parts thereof, in particular to an electronic water pump with a rotor axial limiting structure. Background Art

[0002] Electronic water pumps have high output efficiency and can achieve precise flow control. Therefore, electronic water pumps are widely used in automobiles, household appliances and industrial equipment. For example, new energy vehicles are usually equipped with two or more electronic water pumps as the power source for the entire cooling system.

[0003] The impeller and rotor assembly are both core components of the electronic water pump. The impeller and rotor assembly are usually rigidly connected through a rotating shaft. When the electronic water pump is in operation, it is affected by various factors, which will cause a certain degree of axial movement of the rotor assembly. For example, when the electronic water pump is operating under rated conditions, its impeller is affected by hydraulic pressure, which will generate a force opposite to the direction of the incoming water flow, and then pull the rotor assembly through the rotating shaft, causing the rotor assembly to move closer to the impeller.

[0004] In order to avoid excessive displacement of the impeller-rotor assembly and protect other components of the electronic water pump, thrust washers are usually installed at the rotor assembly or the chamber of the electronic water pump. However, the rotor assembly and thrust washers are both rigid components. Axial movement with excessive stroke and high frequency may still cause damage to the rotor assembly, thrust washers and other components of the electronic water pump.

[0005] In summary, how to provide an axial limiting structure for the rotor assembly of the electronic water pump has become one of the problems that need to be solved urgently. Utility Model Content

[0006] The purpose of the utility model is to provide an electronic water pump with a rotor axial limiting structure, which can provide an axial limiting structure for a rotor assembly.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electronic water pump with a rotor axial limiting structure, comprising a pump casing assembly, a pump cover member, a rotor assembly, a rotating shaft, an impeller group and a stator assembly; the inner cavity of the pump casing assembly forms a rotor chamber, the inner cavity of the pump cover member forms an impeller chamber, the pump cover member covers and is fixed to one end of the pump casing assembly to shield the impeller chamber; the rotating shaft is supported in the pump casing assembly and passes through the rotor chamber of the pump casing assembly and the impeller chamber of the pump cover member; the rotor assembly is accommodated in the rotor chamber of the pump casing assembly and is sleeved on the rotating shaft, so that the rotor assembly and the rotating shaft are fixed relative to each other in the circumferential direction and relative to the axial direction; The impeller group is accommodated in the impeller chamber of the pump cover component and is sleeved on the rotating shaft, so that the impeller group and the rotating shaft are fixed relative to each other in the circumferential direction and relative to the axial direction; the stator assembly is accommodated and fixed in the pump casing assembly and is arranged in an annular manner outside the rotor chamber; when the stator assembly is energized, it can magnetically couple and drive the rotor assembly to rotate in the rotor chamber, thereby driving the rotating shaft and the impeller group to rotate; thrust-limiting components are respectively provided at the two axial ends of the rotor assembly; the thrust-limiting components of the rotor assembly can resist the structure / components in the rotor chamber, or the thrust-limiting components of the rotor assembly are close to the structure / components in the rotor chamber.

[0008] In the above technical solution, the rotor assembly includes a rotor core, permanent magnets inserted into the rotor core according to polarity, and a rotor shell covering the surface of the rotor core.

[0009] In the above technical solution, the thrust-limiting component includes a flexible sleeve and a thrust washer embedded in the flexible sleeve; the flexible sleeve of the thrust-limiting component abuts against the end face of the rotor assembly; the end face of the thrust washer of the thrust-limiting component can abut against the structure / component in the rotor chamber, or the end face of the thrust washer of the thrust-limiting component is close to the structure / component in the rotor chamber.

[0010] In the above technical solution, an annular embedding groove is formed at the flexible sleeve; the thrust washer is configured as annular embedding ribs and contact portions in sequence along its radial direction; the annular embedding ribs of the thrust washer are embedded in the annular embedding groove of the flexible sleeve, and the contact portion of the thrust washer is exposed to the flexible sleeve.

[0011] In the above technical solution, the end face of the rotor shell of the rotor core is convex to form a matching rib; the flexible sleeve of the thrust-limiting component is concave relative to one end face of the thrust washer to form a matching groove; when the flexible sleeve of the thrust-limiting component presses against the end face of the rotor assembly, the matching rib of the rotor shell is embedded in the matching groove of the flexible sleeve.

[0012] In the above technical solution, the pump casing assembly includes a main pump casing component, a rear end casing component and a dry-wet shielding sleeve; an end plate is formed at one end of the main pump casing component, and a first bearing is embedded in the end plate; the pump cover component is combined and fixed to the end of the main pump casing component provided with the end plate to shield the impeller chamber; a second bearing is embedded in the rear end casing component; the rear end casing component is combined and fixed to the other end of the main pump casing component relative to the end plate, and the first bearing and the second bearing are aligned with each other in the axial direction; the two ends of the dry-wet shielding sleeve are respectively sealed with the end plate of the main pump casing component and the rear end casing component, so that the end plate of the main pump casing component, the dry-wet shielding sleeve and the rear end casing component form the rotor chamber; one end of the rotating shaft is supported by the second bearing, and the rotating shaft passes through the first bearing from the rotor chamber of the pump casing assembly to enter the impeller chamber of the pump cover component, and the rotating shaft is also supported by the first bearing; the stator assembly is arranged around the periphery of the dry-wet shielding sleeve.

[0013] In the above technical solution, one of the thrust-limiting components can abut against the first bearing or be close to the first bearing; the other thrust-limiting component can abut against the second bearing or be close to the second bearing.

[0014] In the above technical solution, the electronic water pump with a rotor axial limiting structure of the present invention further includes a driving circuit board; the driving circuit board is accommodated and fixed in the pump housing assembly and is electrically connected to the stator assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the electronic water pump with a rotor axial limiting structure of the present invention has thrust-limiting components at the two axial ends of its rotor assembly, respectively. The thrust-limiting components of the rotor assembly can bear against the structure / components in the rotor chamber, or the thrust-limiting components of the rotor assembly are close to the structure / components in the rotor chamber; through the thrust-limiting components, the two ends of the stator assembly can be effectively axially limited to limit the axial movement of the stator assembly, thereby avoiding loss / damage to the stator assembly, thrust washer and other components of the electronic water pump, and improving the performance, stability and service life of the electronic water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional structural view of the utility model.

[0017] Figure 2 This is an exploded structural view of the present invention.

[0018] Figure 3 This is a cross-sectional structural view of the present invention.

[0019] Figure 4 This is a cross-sectional structural view of the rotor assembly and the rotating shaft in the present invention.

[0020] The accompanying drawings are marked as follows: 1. pump casing assembly; 11. main pump casing component; 111. end plate; 1111. first bearing seat; 1112. first shielding sleeve interface; 12. rear end casing component; 121. second bearing seat; 122. second shielding sleeve interface; 13. dry and wet shielding sleeve; 2. pump cover component; 21. water inlet; 22. water outlet; 3. rotor assembly; 31. rotor core; 32. permanent magnet; 33. rotor housing; 331. mating rib; 34. thrust-limiting component; 341. flexible sleeve; 3411. annular embedding groove; 3412. mating groove; 342. thrust washer; 3421. annular embedding rib; 3422. contact portion; 4. rotating shaft; 5. first bearing; 6. second bearing; 7. impeller group; 8. stator assembly; 9. drive circuit board; 10. rotor chamber; 20. impeller chamber. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0022] This embodiment provides an electronic water pump with a rotor axial limiting structure, which is used to drive a liquid medium to flow in a directional manner.

[0023] See also Figures 1-4 The electronic water pump with a rotor axial limiting structure of this embodiment includes a pump casing assembly 1, a pump cover component 2, a rotor assembly 3, a rotating shaft 4, an impeller assembly 7 and a stator assembly 8.

[0024] Among them, the pump housing assembly 1 is a shell structure composed of a single shell component or several shell components, which is used as the structural support basis and functional support basis of the electronic water pump; the pump cover component 2 is a cover-shaped component made of engineering plastic material, which is used as a flow guiding component of the electronic water pump; the rotating shaft 4 is a cylindrical metal shaft; the impeller group 7 is a wheel-shaped body composed of a single engineering plastic component or several engineering plastic components, which has several blades and can drive the liquid medium to flow in a directional manner when it rotates; the stator assembly 8 is a combination of several enameled wires wound on a skeleton, which can generate a rotating magnetic field when energized.

[0025] The inner cavity of the pump casing assembly 1 forms a rotor chamber 10 , and the inner cavity of the pump cover member 2 forms an impeller chamber 20 . The pump cover member 2 covers and is fixed to one end of the pump casing assembly 1 to shield the impeller chamber 20 .

[0026] It can be understood that the pump cover component 2 is also formed with a water inlet 21 and a water outlet 22. In this embodiment, the water inlet 21 and the water outlet 22 are both integrally formed on the pump cover component 2 and have short tubular structural features that connect the outside world and the impeller chamber 20.

[0027] The rotary shaft 4 is supported in the pump housing assembly 1 and penetrates the rotor chamber 10 of the pump housing assembly 1 and the impeller chamber 20 of the pump cover member 2 .

[0028] The rotor assembly 3 is accommodated in the rotor chamber 10 of the pump casing assembly 1 and is sleeved on the rotating shaft 4, so that the rotor assembly 3 and the rotating shaft 4 are fixed relative to each other in the circumferential direction and relative to each other in the axial direction; the impeller group 7 is accommodated in the impeller chamber 20 of the pump cover member 2 and is sleeved on the rotating shaft 4, so that the impeller group 7 and the rotating shaft 4 are fixed relative to each other in the circumferential direction and relative to each other in the axial direction. In this embodiment, the impeller group 7 and the rotating shaft 4 are interference fit, and the impeller group 7 and the end of the rotating shaft 4 are fixed to each other by screws.

[0029] The stator assembly 8 is housed and fixed in the pump casing assembly 1 and is arranged outside the rotor chamber 10; when the stator assembly 8 is energized, it can magnetically couple and drive the rotor assembly 3 to rotate in the rotor chamber 10, thereby driving the rotating shaft 4 and the impeller group 7 to rotate.

[0030] In order to axially limit the stator assembly 8 and restrict the axial movement of the stator assembly 8, thrust-limiting components 34 are respectively provided at the two axial ends of the rotor assembly 3; the thrust-limiting components 34 of the rotor assembly 3 can resist the structure / components in the rotor chamber 10, or the thrust-limiting components 34 of the rotor assembly 3 are close to the structure / components in the rotor chamber 10.

[0031] Specifically, the rotor assembly 3 comprises a rotor core 31, permanent magnets 32 inserted into the rotor core 31 in correspondence with the polarity, and a rotor shell 33 covering the surface of the rotor core 31; wherein the rotor core 31 is a metal block structure stacked by a plurality of silicon steel sheets, and is provided with a plurality of permanent magnet 32 insertion slots; the permanent magnet 32 is a square metal body with permanent magnetism, and is inserted into the permanent magnet 32 insertion slot of the rotor core 31 in correspondence with the polarity; the rotor shell 33 is an integral injection molding structure, and in this embodiment, the rotating shaft 4 also forms an integral injection molding structure with the rotor assembly 3; specifically, the assembled rotating shaft 4, rotor core 31 and permanent magnet 32 are placed in the injection mold of the rotor shell 33, plastic material is injected and solidified and demolded, and then an integral assembly composed of the rotating shaft 4, rotor core 31, permanent magnet 32 and rotor shell 33 is obtained; the rotor shell 33 of the rotor assembly 3 and the rotating shaft 4 are matched by rib-shaped structure-groove-shaped structure, so that the rotor assembly 3 and the rotating shaft 4 are relatively circumferentially fixed and relatively axially fixed.

[0032] Specifically, the thrust-limiting component 34 comprises a flexible sleeve 341 and a thrust washer 342 embedded in the flexible sleeve 341; wherein the flexible sleeve 341 is a sleeve-shaped member made of rubber material, silica gel material or soft plastic material, and the thrust washer 342 is a ceramic sheet; the flexible sleeve 341 of the thrust-limiting component 34 abuts against the end face of the rotor assembly 3; the end face of the thrust washer 342 of the thrust-limiting component 34 can abut against the structure / component in the rotor chamber 10, or the end face of the thrust washer 342 of the thrust-limiting component 34 is close to the structure / component in the rotor chamber 10.

[0033] Further specifically, the flexible sleeve 341 is formed with an annular embedding groove 3411, that is, the annular embedding groove 3411 is integrally injection molded with the body of the flexible sleeve 341; the thrust washer 342 is sequentially configured with an annular embedding rib 3421 and a contact portion 3422 along the radial direction thereof, specifically, the annular embedding rib 3421 and the contact portion 3422 are integrally formed and constitute a stacked structure along the axial direction, thereby constituting the thrust washer 342, and the outer diameter of the annular embedding rib 3421 is larger than that of the contact portion 3422; the annular embedding rib 3421 of the thrust washer 342 is embedded in the annular embedding groove 3411 of the flexible sleeve 341, and the contact portion 3422 of the thrust washer 342 is exposed outside the flexible sleeve 341.

[0034] Furthermore, the end surface of the rotor shell 33 of the rotor core 31 is convex to form a matching rib 331, and the matching rib 331 is injection-molded integrally with the rotor shell 33; the flexible sleeve 341 of the thrust-limiting component 34 is concave on one side of the end surface relative to the thrust washer 342 to form a matching groove 3412, and the matching groove 3412 is injection-molded integrally with the flexible sleeve 341; when the flexible sleeve 341 of the thrust-limiting component 34 presses against the end surface of the rotor assembly 3, the matching rib 331 of the rotor shell 33 is embedded in the matching groove 3412 of the flexible sleeve 341.

[0035] Specifically, the pump casing assembly 1 includes a main pump casing member 11, a rear end casing member 12 and a dry and wet shielding sleeve 13; wherein, the main pump casing member 11 and the rear end casing member 12 are both semi-shell members made of engineering plastics, and the dry and wet shielding sleeve 13 is a sleeve-shaped metal member with magnetic conductivity; an end plate 111 is formed at one end of the main pump casing member 11, and a first bearing 5 is embedded in the end plate 111. Specifically, the end plate 111 is a plate-shaped structural feature that closes one end of the main pump casing member 11 (but a first bearing seat 1111 is left at the end plate 111 to embed the first bearing 5, and the end plate 11 1 also leaves a flow hole to connect the rotor chamber 10 and the impeller chamber 20); the pump cover member 2 is combined and fixed to one end of the main pump casing member 11 provided with an end plate 111 to shield the impeller chamber 20 (specifically fixed by screws or snaps, and sealed by a sealing ring); the second bearing 6 is embedded in the rear end casing member 12, specifically, the rear end casing member 12 leaves a second bearing seat 121 to embed the second bearing 6; the rear end casing member 12 is combined and fixed to the other end of the main pump casing member 11 relative to the end plate 111 (specifically fixed by screws or snaps, and sealed by a sealing ring The ring is sealed), and the first bearing 5 and the second bearing 6 are aligned with each other in the axial direction; the two ends of the dry and wet shielding sleeve 13 are respectively sealed with the end plate 111 and the rear end shell member 12 of the main pump casing member 11, so that the end plate 111 of the main pump casing member 11, the dry and wet shielding sleeve 13 and the rear end shell member 12 form a rotor chamber 10. In this embodiment, a first shielding sleeve interface 1112 is formed on the inner side of the end plate 111 of the main pump casing member 11, and a second shielding sleeve interface 122 is formed on the inner side of the rear end shell member 12. One end of the dry and wet shielding sleeve 13 is plugged into the first shielding sleeve of the main pump casing member 11 The interface 1112 is sealed by a sealing ring. The other end of the dry and wet shielding sleeve 13 is sleeved on the second shielding sleeve interface 122 of the rear end shell component 12 and is sealed by a sealing ring. One end of the rotating shaft 4 is supported by the second bearing 6, and the rotating shaft 4 passes through the first bearing 5 from the rotor chamber 10 of the pump casing assembly 1, thereby entering the impeller chamber 20 of the pump cover component 2, and the rotating shaft 4 is also supported by the first bearing 5. The stator assembly 8 is arranged on the periphery of the dry and wet shielding sleeve 13, and the stator assembly 8 can be fixed by interference fit, snap fasteners, glue or screws.

[0036] Specifically, for one of the thrust-limiting components 34, it (specifically, the contact portion 3422 of its thrust washer 342) can press against the first bearing 5, or be close to the first bearing 5; for the other thrust-limiting component 34, it (specifically, the contact portion 3422 of its thrust washer 342) can press against the second bearing 6, or be close to the second bearing 6.

[0037] Specifically, the electronic water pump with a rotor axial limiting structure in this embodiment also includes a drive circuit board 9, which is a printed circuit board equipped with a main control, a stator drive module / stator drive chip and necessary peripheral circuits for driving the stator assembly 8 to operate; the drive circuit board 9 is accommodated and fixed in the pump housing assembly 1, and is electrically connected to the stator assembly 8; in this embodiment, the drive circuit board 9 is accommodated and fixed in the rear end shell member 12 of the pump housing assembly 1, and is fixed by screws or snaps, and the open end of the rear end shell member 12 is also provided with a cover plate to shield the drive circuit board 9; in this embodiment, a terminal is provided at the stator assembly 8, and the terminal passes through the rear end shell member 12 and is welded to the drive circuit board 9 to realize the electrical connection between the stator assembly 8 and the drive circuit board 9; a connector is provided at the rear end shell member 12, which is electrically connected to the drive circuit board 9 and selectively connected to the signal, so that the drive circuit board 9 can take power and can selectively receive control signals and / or feedback operating status.

[0038] In the electronic water pump with a rotor axial limiting structure of this embodiment, when in use, the driving circuit board 9 draws power from an external power supply through a connector and drives the stator assembly 8 to operate. When the stator assembly 8 is in operation, a rotating magnetic field can be generated in its inner ring, thereby magnetically coupling and driving the rotor assembly 3 to rotate in the rotor chamber 10, thereby driving the rotating shaft 4 and the impeller assembly 7 to rotate, thereby achieving the basic function of driving the directional flow of the liquid medium. In the above process, one of the thrust-limiting components 34 (specifically, the contact portion 3422 of its thrust washer 342) can abut against the first bearing 5 or be close to the first bearing 5; for the other thrust-limiting component 34, it (specifically, the contact portion 3422 of its thrust washer 342) can abut against the second bearing 6 or be close to the second bearing 6, thereby effectively axially limiting the two ends of the stator assembly 8 to limit the axial movement of the stator assembly 8.

[0039] The electronic water pump with the rotor axial limiting structure of the embodiment is provided with the thrust-limiting components 34 at two axial ends of the rotor assembly 3, the thrust-limiting components 34 of the rotor assembly 3 can abut against the structures / parts in the rotor chamber 10, or the thrust-limiting components 34 of the rotor assembly 3 are close to the structures / parts in the rotor chamber 10; through the thrust-limiting components 34, the two ends of the stator assembly 8 can be effectively axially limited respectively, so as to limit the axial movement of the stator assembly 8, avoid the wear / damage of the stator assembly 8, the thrust washer 342 and other parts of the electronic water pump, and improve the performance, stability and service life of the electronic water pump.

[0040] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An electronic water pump with a rotor axial limit structure, comprising a pump housing assembly, a pump cover member, a rotor assembly, a rotating shaft, an impeller assembly, and a stator assembly; The inner cavity of the pump housing assembly forms a rotor chamber, the inner cavity of the pump cover member forms an impeller chamber, and the pump cover member covers and is fixed to one end of the pump housing assembly to shield the impeller chamber; The rotating shaft is supported in the pump housing assembly and passes through the rotor chamber of the pump housing assembly and the impeller chamber of the pump cover member; The rotor assembly is accommodated in the rotor chamber of the pump housing assembly and is sleeved on the rotating shaft, so that the rotor assembly and the rotating shaft are fixed relative to each other in the circumferential direction and the axial direction; the impeller group is accommodated in the impeller chamber of the pump cover member and is sleeved on the rotating shaft, so that the impeller group and the rotating shaft are fixed relative to each other in the circumferential direction and the axial direction; The stator assembly is accommodated and fixed in the pump housing assembly and is arranged outside the rotor chamber. When the stator assembly is energized, it can drive the rotor assembly to rotate in the rotor chamber through magnetic coupling, thereby driving the rotating shaft and the impeller assembly to rotate. It is characterized in that The two axial ends of the rotor assembly are respectively provided with thrust-limiting components; The thrust-stop member of the rotor assembly can abut against a structure / component in the rotor chamber, or the thrust-stop member of the rotor assembly is close to a structure / component in the rotor chamber.

2. The electronic water pump with a rotor axial limiting structure according to claim 1, characterized in that: The rotor assembly includes a rotor core, permanent magnets inserted into the rotor core according to polarity, and a rotor shell covering the surface of the rotor core.

3. The electronic water pump with a rotor axial limiting structure according to claim 2, characterized in that: The thrust-limiting component includes a flexible sleeve and a thrust washer embedded in the flexible sleeve; The flexible sleeve of the thrust-limiting component abuts against the end surface of the rotor assembly; The end surface of the thrust washer of the thrust-limiting component can abut against the structure / component in the rotor chamber, or the end surface of the thrust washer of the thrust-limiting component is close to the structure / component in the rotor chamber.

4. The electronic water pump with a rotor axial limiting structure according to claim 3, characterized in that: An annular embedding groove is formed at the flexible sleeve; The thrust washer is sequentially configured as an annular embedded rib and a contact portion along its radial direction; The annular embedding rib of the thrust washer is embedded in the annular embedding groove of the flexible sleeve, and the contact portion of the thrust washer is exposed to the flexible sleeve.

5. The electronic water pump with a rotor axial limiting structure according to claim 3 or 4, characterized in that: The end surface of the rotor shell of the rotor core is convex to form a matching rib; The flexible sleeve of the thrust-limiting component is concave relative to one end surface of the thrust washer to form a matching groove; When the flexible sleeve of the thrust-limiting component abuts against the end surface of the rotor assembly, the matching rib of the rotor housing is embedded in the matching groove of the flexible sleeve.

6. The electronic water pump with a rotor axial limiting structure according to claim 1, characterized in that: The pump casing assembly includes a main pump casing component, a rear end casing component and a dry and wet shielding sleeve; An end plate is formed at one end of the main pump housing component, and a first bearing is embedded in the end plate; The pump cover member covers and is fixed to one end of the main pump casing member provided with the end plate to shield the impeller chamber; A second bearing is embedded in the rear end housing component; The rear end housing member covers and is fixed to the other end of the main pump housing member relative to the end plate, and aligns the first bearing and the second bearing with each other in the axial direction; The two ends of the dry and wet shielding sleeve are respectively sealed with the end plate of the main pump casing member and the rear end casing member, so that the end plate of the main pump casing member, the dry and wet shielding sleeve and the rear end casing member enclose the rotor chamber; One end of the rotating shaft is supported by the second bearing, and the rotating shaft passes through the first bearing from the rotor chamber of the pump housing assembly to enter the impeller chamber of the pump cover member, and the rotating shaft is also supported by the first bearing; The stator assembly is arranged around the periphery of the dry and wet shielding sleeve.

7. The electronic water pump with a rotor axial limiting structure according to claim 6, characterized in that: One of the thrust-limiting components is capable of abutting against the first bearing or being close to the first bearing; The other thrust-limiting component can abut against the second bearing or be close to the second bearing.

8. The electronic water pump with a rotor axial limiting structure according to claim 1, characterized in that: Also includes a driver circuit board; The driving circuit board is accommodated and fixed in the pump housing assembly and is electrically connected to the stator assembly.

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