WO2023088475A1

WO2023088475A1 - Rotor assembly of electronic water pump and electronic water pump

Info

Publication number: WO2023088475A1
Application number: PCT/CN2022/133383
Authority: WO
Inventors: 王俊杰; 周小伟
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2021-11-22
Filing date: 2022-11-22
Publication date: 2023-05-25
Also published as: CN216278538U

Abstract

A rotor assembly of an electronic water pump and an electronic water pump comprising the rotor assembly. The rotor assembly comprises: a bearing assembly (1), a magnetic ring assembly (2), an impeller seat (3), and an impeller cover (4). The bearing assembly (1) has a first central through hole (11); an end portion of the bearing assembly (1) is provided with a first limiting portion (12); the magnetic ring assembly (2) is sleeved on and in interference connection with the bearing assembly (1); at least one end of the bearing assembly (1) extends out of the magnetic ring assembly (2); the impeller seat (3) covers the end portion of the bearing assembly (1); and the impeller seat (3) is provided with a second limiting portion (31) in limiting fit with the first limiting portion (12). According to the rotor assembly, the number of times of injection molding of the rotor assembly is reduced, and the dynamic balance precision of the rotor assembly is ensured.

Description

Rotor assembly of electronic water pump and electronic water pump

cross reference

This disclosure claims the priority of the Chinese patent application with the application number 202122906945.8 titled "Electronic Water Pump Rotor Assembly and Electronic Water Pump" filed on November 22, 2021, the entire content of which is incorporated herein by reference.

technical field

The present disclosure relates to the technical field of electronic water pumps, in particular, to a rotor assembly of an electronic water pump and the electronic water pump.

Background technique

The rotor assembly is the core component of the electronic water pump. When the electronic water pump is working, the rotor assembly is energized and converts its own mechanical energy into fluid kinetic energy. The quality of the rotor assembly seriously affects the working efficiency of the electronic water pump. For example, if the dynamic balance accuracy of the rotor assembly is poor, it will cause the vibration of the electronic water pump to reduce the service life of the electronic water pump, and it will emit loud noises and cause environmental pollution.

It should be noted that the information disclosed in the above background section is only for enhancing the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art.

Contents of the invention

The purpose of the present disclosure is to provide a rotor assembly of an electronic water pump and an electronic water pump, which can ensure the dynamic balance accuracy of the rotor assembly, increase the service life of the electronic water pump, and reduce noise pollution at the same time.

According to one aspect of the present disclosure, there is provided a rotor assembly of an electronic water pump, including:

A bearing assembly, the bearing assembly has a first central through hole, the first central through hole is used to be sleeved on the rotating shaft, and the end of the bearing assembly has a first stopper;

A magnetic ring assembly, the magnetic ring assembly is sleeved on the bearing assembly, the magnetic ring assembly is in interference connection with the bearing assembly, and at least one end of the bearing assembly protrudes from the magnetic ring assembly;

an impeller seat, the impeller seat wraps the end of the bearing assembly, and the impeller seat has a second stopper that is limitedly fitted with the first stopper;

The impeller cover is fixedly connected to the side of the impeller seat away from the bearing assembly.

According to the rotor assembly according to an embodiment of the present disclosure, the bearing assembly includes a shaft sleeve, and the impeller seat has a bush extending along the axial direction of the shaft sleeve and adjoining the hole wall of the first central through hole.

According to the rotor assembly according to an embodiment of the present disclosure, the material of the impeller seat includes polyphenylene sulfide.

According to the rotor assembly according to an embodiment of the present disclosure, the bearing assembly includes a shaft sleeve and a bearing;

The bearing has the first central through hole, the sleeve is sleeved on the bearing, and is in interference connection with the bearing;

The impeller seat wraps at least one of the end of the bearing and the end of the sleeve.

According to the rotor assembly according to an embodiment of the present disclosure, the bearing is a graphite bearing.

According to the rotor assembly according to an embodiment of the present disclosure, one of the outer wall of the bearing and the inner wall of the sleeve has a groove, and the other has a protrusion limited in the groove.

According to the rotor assembly according to an embodiment of the present disclosure, at least one of the outer wall of the bearing and the outer wall of the sleeve has the first limiting portion.

According to the rotor assembly according to an embodiment of the present disclosure, the side wall of the end portion of the bearing assembly has a plurality of the first limiting portions in the circumferential direction, and the impeller seat has a first end for accommodating the bearing assembly. The embedding groove, the groove wall of the embedding groove has a plurality of the second limiting parts in the circumferential direction, and the plurality of the second limiting parts are respectively limited in the plurality of the first limiting parts. Ministry.

According to the rotor assembly according to an embodiment of the present disclosure, the magnetic ring assembly includes an iron core assembly, a first cover plate, a second cover plate and a sleeve;

The first cover plate, the iron core assembly, and the second cover plate are sequentially sleeved on the bearing assembly, the iron core assembly is in interference connection with the bearing assembly, and the first cover plate Both the inner circle and the inner circle of the second cover plate are sealed and fixedly connected with the bearing assembly;

The sleeve is sleeved on the iron core assembly, and the sleeve is respectively sealed and fixedly connected to the outer circle of the first cover plate and the outer circle of the second cover plate.

According to another aspect of the present disclosure, there is provided an electronic water pump, which includes a housing and the rotor assembly described in the above aspect;

The housing has an inner cavity and a rotating shaft located in the inner cavity, and the rotor assembly is accommodated in the inner cavity and rotatably sleeved on the rotating shaft.

In the embodiment of the present disclosure, the coaxiality between the magnetic ring assembly and the bearing assembly is ensured through the interference connection between the magnetic ring assembly and the bearing assembly, and then the interference connected magnetic ring assembly and bearing assembly are connected to the impeller seat. Therefore, in the embodiment of the present disclosure, the number of embedded injection molding processes is reduced when the rotor assembly is produced, thereby ensuring the dynamic balance accuracy of the rotor assembly, avoiding the vibration of the electronic water pump with the rotor assembly during operation, and prolonging the life of the electronic water pump. service life, while avoiding noise pollution to the environment.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure. Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a rotor assembly provided in the related art.

Fig. 2 is a schematic structural diagram of a rotor assembly provided by an embodiment of the present disclosure.

Fig. 3 is an exploded schematic diagram of a partial structure of a rotor assembly provided by an embodiment of the present disclosure.

Fig. 4 is a partial structural schematic diagram of another rotor assembly provided by an embodiment of the present disclosure.

Fig. 5 is a schematic structural diagram of another rotor assembly provided by an embodiment of the present disclosure.

Fig. 6 is a schematic diagram of a partial structure of a rotor assembly provided by an embodiment of the present disclosure.

Reference signs:

1. Bearing assembly; 2. Magnetic ring assembly; 3. Impeller seat; 4. Impeller cover;

11. The first central through hole; 12. The first limiting part; 13. The shaft sleeve; 14. The bearing;

21. Iron core assembly; 22. First cover plate; 23. Second cover plate; 24. Sleeve;

31. The second limiting part; 32. The bushing.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience, for example, according to the description in the accompanying drawings directions for the example described above. It will be appreciated that if the illustrated device is turned over so that it is upside down, then elements described as being "upper" will become elements that are "lower". When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" placed on another structure, or that a structure is "indirectly" placed on another structure through another structure. other structures.

The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/etc; the terms "comprising" and "have" are used to indicate an open and means that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first", "second" and "third" etc. only Used as a marker, not a limit on the number of its objects.

An embodiment of the present disclosure provides an electronic water pump, which includes a housing and a rotor assembly. The housing has an inner cavity and a rotating shaft located in the inner cavity. The rotor assembly is accommodated in the inner cavity and is rotatably sleeved on the rotating shaft. .

The shell wall of the housing has a water inlet and a water outlet connected to the inner cavity. When the electronic water pump is working, the rotor assembly is connected to an external power supply and rotates, and the fluid enters the inner cavity of the housing along the water inlet. The mechanical energy is converted into the kinetic energy of the fluid, so that the fluid flows out along the water outlet at a higher flow rate.

Among them, the specific structure of the housing can refer to related technologies. The rotor assembly mainly includes a shaft sleeve 13, a magnetic ring assembly 2, an impeller seat 3 and an impeller cover 4, and the magnetic ring assembly 2 includes an iron core and a magnetic steel. For details, see Figure 2 below. the implementation described above.

In the related art, the rotor assembly can only be processed through at least two injection molding processes. As shown in Figure 1, the magnetic ring assembly 2 (iron core and magnetic steel) is injected as an insert to obtain the first injection molded part including the impeller seat 3 (containing part) and the magnetic ring assembly 2 (contained part), and then The first injection molded part obtained by injection molding is injected as an insert to obtain the second injection molded part comprising the first injection molded part (contained part) and the shaft sleeve 13 (contained part), and finally the impeller cover 4 is fixed on the second injection molded part. The rotor assembly is obtained from the 3 ends of the impeller seat.

In the related art, at least two insert injection molding processes are required to produce the rotor assembly. The inventor found that it is difficult to ensure the coaxiality of the containing part and the contained part in the insert injection molding process. Therefore, the more times the insert injection molding process is performed, the rotor assembly The more difficult it is to guarantee the dynamic balance accuracy. In this way, the electronic water pump with the rotor assembly will vibrate during operation, thereby reducing the service life of the electronic water pump, and will also emit relatively large noises to cause environmental pollution.

Fig. 2 shows a schematic structural view of a rotor assembly of an electronic water pump according to an embodiment of the present disclosure. As shown in Figure 2, the rotor assembly includes a bearing assembly 1, a magnetic ring assembly 2, an impeller seat 3 and an impeller cover 4, the bearing assembly 1 has a first central through hole 11, and the first central through hole 11 is used to be sleeved in the rotating Shaft, the end of the bearing assembly 1 has a first stopper 12; the magnetic ring assembly 2 is sleeved on the bearing assembly 1, the magnetic ring assembly 2 is in interference connection with the bearing assembly 1, and at least one end of the bearing assembly 1 protrudes from the magnetic The ring assembly 2; the impeller seat 3 wraps the end of the bearing assembly 1, and the impeller seat 3 has a second limiter 31 that is limitedly fitted with the first limiter 12; the impeller cover 4 is fixedly connected to the impeller seat 3 away from the bearing assembly 1 side.

In the embodiment of the present disclosure, the coaxiality between the magnetic ring assembly 2 and the bearing assembly 1 is ensured through the interference connection between the magnetic ring assembly 2 and the bearing assembly 1, and then the interference-connected magnetic ring assembly 2 and the bearing assembly 1 is connected with the impeller seat 3. Therefore, in the embodiment of the present disclosure, the number of embedded injection molding processes can be reduced when the rotor assembly is produced, thereby ensuring the dynamic balance accuracy of the rotor assembly, avoiding the vibration of the electronic water pump with the rotor assembly during operation, and prolonging the life of the electronic water pump. service life, while avoiding noise pollution to the environment. In addition, in the embodiment of the present disclosure, after the first end of the bearing assembly 1 is injection-molded to form the impeller seat 3 , the relative relationship between the bearing assembly 1 and the impeller seat 3 can be limited by the cooperation of the first limiting portion 12 and the second limiting portion 31 . Rotation avoids the phenomenon of slipping between the bearing assembly 1 and the impeller seat 3, and ensures the working efficiency of the rotor assembly.

Wherein, the first limiting portion 12 is a limiting groove, and the second limiting portion 31 is a limiting block; or, the first limiting portion 12 is a limiting block, and the second limiting portion 31 is a limiting groove, as long as It only needs to realize the limited cooperation between the first limiting part 12 and the second limiting part 31 , which is not limited by the embodiments of the present disclosure. The first end of the bearing assembly 1 protrudes from the magnetic ring assembly 2 , and the second end of the bearing assembly 1 protrudes from the magnetic ring assembly 2 or is flush with the end surface of the magnetic ring assembly 2 .

In the embodiment of the present disclosure, the impeller cover 4 and the impeller seat 3 are fixed by welding, specifically, the impeller cover 4 and the impeller seat 3 are fixed by ultrasonic welding. Of course, other connection methods are also possible, as long as the fixed connection between the impeller cover and the impeller seat can be realized, which is not limited in the embodiments of the present disclosure.

In some embodiments, as shown in FIG. 3 , the magnetic ring assembly 2 mainly includes an iron core assembly 21, the iron core assembly 21 has a second central through hole, and the iron core assembly 21 is sleeved on the bearing assembly 1 based on the second central through hole. Above, the iron core assembly 21 is in interference connection with the bearing assembly 1 to ensure the coaxiality of the iron core assembly 21 and the bearing assembly 1 .

Wherein, the iron core assembly 21 includes the above-mentioned iron core and magnetic steel, which can be manufactured in advance through an integral molding process to ensure the coaxiality of the iron core and the magnetic steel, and the iron core and the magnetic steel are integrated For the manufacturing process of molding, reference may be made to related technologies. Of course, the iron core and the magnetic steel can also be obtained through other processes, as long as the coaxiality between the iron core and the magnetic field can be ensured, which is not limited in the embodiments of the present disclosure.

Optionally, the inner wall of the second central through hole has a protrusion, and the outer wall of the bearing assembly 1 has a groove matching the protrusion; or the inner wall of the second central through hole has a groove, and the outer wall of the bearing assembly 1 has a groove that matches the groove. The matching protrusions, protrusions and grooves are all along the axial direction of the second central through hole. In this way, through the cooperation of the protrusion and the groove, the contact area between the core assembly 21 and the bearing assembly 1 is increased, and at the same time, the relative rotation between the iron core assembly 21 and the bearing assembly 1 is further avoided.

In order to realize the sealing of the core assembly 21 , as shown in FIG. 3 , the magnetic ring assembly 2 further includes a first cover plate 22 , a second cover plate 23 and a sleeve 24 . The first cover plate 22 and the second cover plate 23 are sleeved on the bearing assembly 1, and are located at both ends of the iron core assembly 21 respectively, that is, the first cover plate 22, the iron core assembly 21, the second cover plate 22 included in the magnetic ring assembly 2 The two cover plates 23 are sequentially sleeved on the bearing assembly 1 , and the inner circles of the first cover plate 22 and the second cover plate 23 are sealed and fixedly connected with the bearing assembly 1 . The sleeve 24 is sleeved on the iron core assembly 21 , and the sleeve 24 is respectively sealed and fixedly connected to the outer circle of the first cover plate 22 and the outer circle of the second cover plate 23 .

In this way, through the connection between the first cover plate 22 and the second cover plate 23 and the bearing assembly 1 respectively, and the connection between the first cover plate 22 and the second cover plate 23 and the bushing 24 respectively, a steel plate for accommodating iron can be formed. The sealed cavity of the core assembly 21 realizes the sealing protection of the iron core assembly 21 .

The connection between the first cover plate 22 and the second cover plate 23 and the bearing assembly 1 respectively, and the connection between the first cover plate 22 and the second cover plate 23 and the bushing 24 respectively can be welding, specifically, Laser welding is available. Of course, other connection methods may also be used, as long as the sealing and protection of the iron core assembly 21 can be achieved, which is not limited in the embodiments of the present disclosure.

In some embodiments, as shown in FIG. 4 or FIG. 5 , the bearing assembly 1 includes a shaft sleeve 13 having a first central through hole 11 , and an end of the shaft sleeve 13 has a first limiting portion 12 . The shaft sleeve 13 is used for being rotatably sleeved on the rotating shaft.

Wherein, the shaft sleeve 13 can be used as an insert, and the impeller seat 3 is formed at the end of the shaft sleeve 13 by insert injection molding. Of course, the impeller seat 3 can also be pre-injected, and the impeller seat 3 is connected to the end of the shaft sleeve 13 while ensuring the limited fit between the first limiting portion 12 and the second limiting portion 31 .

Since the shaft sleeve 13 and the rotating shaft are both rigid parts, the friction between the shaft sleeve 13 and the rotating shaft is relatively large when the rotor assembly rotates. Therefore, in order to reduce the friction between the shaft sleeve 13 and the rotating shaft, the impeller is formed by injection When the seat 3 is installed, as shown in FIG. 4 or FIG. 5 , a bushing 32 is also formed on the inner wall of the first central through hole 11 . That is, the impeller seat 3 has a bushing 32 extending along the axial direction of the sleeve 13 and adjoining the hole wall of the first central through hole 11 . In this way, when the rotor assembly rotates, the bushing 32 is in direct contact with the rotating shaft and rotates relative to each other, so that the contact between the sleeve 13 and the rotating shaft can be avoided.

When the bushing 32 rotates relative to the rotating shaft, in order to avoid the wear of the bushing 32 and reduce the frictional force, the impeller seat 3 with the bushing 32 can be formed by injection molding of a material with good mechanical properties such as high temperature resistance and wear resistance. . Exemplarily, the material of the impeller seat 3 includes PPS (Polyphenylene sulphide, polyphenylene sulfide).

In other embodiments, as shown in Figure 2 or 6, the bearing assembly 1 includes a shaft sleeve 13 and a bearing 14, the bearing 14 has a first central through hole 11, the shaft sleeve 13 is sleeved on the bearing 14, and is connected to the bearing 14 Interference connection: the impeller seat 3 wraps at least one of the end of the bearing 14 and the end of the shaft sleeve 13 .

The interference connection between the shaft sleeve 13 and the bearing 14 can ensure the coaxiality of the shaft sleeve 13 and the bearing 14, so as to ensure the dynamic balance accuracy of the rotor assembly. The bearing 14 is used for rotatable positioning on the rotating shaft, and the first end of the bearing 14 and/or the first end of the shaft sleeve 13 can be injection-molded as an insert to obtain the impeller seat 3 .

In some embodiments, at least one of the outer wall of the bearing 14 and the outer wall of the sleeve 13 has a first limiting portion 12 . Wherein, the outer wall of the bearing 14 and the outer wall of the shaft sleeve 13 can be specifically determined according to the positional relationship between the bearing 14 and the shaft sleeve 13 .

The first end of the bearing 14 protrudes from the first end of the shaft sleeve 13. At this time, the first end of the bearing 14 is wrapped by the impeller seat 3. The first end of the bearing 14 has a first stopper 12 to pass through the The first limiting part 12 cooperates with the second limiting part 31 on the impeller seat 3 to limit the position, or as shown in Figure 2, the first end of the bearing 14 and the first end of the shaft sleeve 13 are wrapped by the impeller seat 3, The first end of the bearing 14 and the first end of the shaft sleeve 13 both have a first stopper 12, so as to pass through the first stopper 12 on the shaft sleeve 13, the first stopper 12 on the bearing 14 and the impeller seat The second limit part 31 on the 3 cooperates with the limit.

Of course, it is also possible that the first end of the bearing 14 does not protrude from the first end of the shaft sleeve 13. At this time, the first end of the shaft sleeve 13 is wrapped by the impeller seat 3, and the first end of the shaft sleeve 13 has a first stopper. 12, to be limited by the cooperation of the first limiting portion 12 at the first end of the shaft sleeve 13 and the second limiting portion 31 on the impeller seat 3 .

In the embodiment of the present disclosure, as shown in FIG. 2 , first stoppers 12 are provided on the outer walls of the bearing 14 near both ends to prevent the bearing 14 from being reversed when assembling the bushing 13 , thereby improving the assembly process. efficiency.

In order to reduce the friction between the bearing 14 and the rotating shaft when the rotor assembly rotates, and avoid the wear of the bearing 14, the bearing 14 can be made of materials with good mechanical properties such as high temperature resistance, wear resistance, and self-lubrication. Exemplarily, the material of the bearing 14 is graphite, that is, the bearing 14 is a graphite bearing.

Optionally, in order to further ensure the tight fit between the shaft sleeve 13 and the bearing 14, one of the outer wall of the bearing 14 and the inner wall of the shaft sleeve 13 has a groove, and the other has a protrusion limited in the groove . In this way, through the cooperation of the groove and the protrusion, the contact area between the sleeve 13 and the bearing 14 is increased, and at the same time, the relative rotation between the sleeve 13 and the bearing 14 is further avoided. In some embodiments, the side wall of the end of the bearing assembly 1 has a plurality of first stoppers 12 in the circumferential direction, the impeller seat 3 has an inserting groove for accommodating the first end of the bearing assembly 1, and the inserting groove The wall has a plurality of second limiting portions 31 in the circumferential direction. In this way, the possibility of vigorous relative rotation between the bearing assembly 1 and the impeller seat 3 can be avoided through the corresponding positioning of the plurality of first limiting portions 12 and the plurality of second limiting portions 31 . Taking the first limiting portion 12 as a limiting groove and the second limiting portion 31 as a limiting block as an example, the plurality of second limiting portions 31 are correspondingly limited in the plurality of first limiting portions 12 .

Of course, it is also possible that the side arm at the end of the bearing assembly 1 has a plurality of first stoppers 12 in the axial direction, and the groove wall of the embedded groove has a plurality of second stoppers 31 in the axial direction, as long as it does not affect the position of the bearing. The assembly 1 can be used as an embedded part to form the impeller seat 3 , which is not limited in the embodiments of the present disclosure.

The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of illustration and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, those skilled in the art can understand that the utility model is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teaching of the utility model, and these variations and modifications all fall within the scope of the utility model. within the scope of protection. The protection scope of the utility model is defined by the appended claims and their equivalent scope.

Claims

A rotor assembly of an electronic water pump, characterized in that it comprises:

A bearing assembly, the bearing assembly has a first central through hole, the first central through hole is used to be sleeved on the rotating shaft, and the end of the bearing assembly has a first stopper;

A magnetic ring assembly, the magnetic ring assembly is sleeved on the bearing assembly, the magnetic ring assembly is in interference connection with the bearing assembly, and at least one end of the bearing assembly protrudes from the magnetic ring assembly;

an impeller seat, the impeller seat wraps the end of the bearing assembly, and the impeller seat has a second stopper that is limitedly fitted with the first stopper;

The impeller cover is fixedly connected to the side of the impeller seat away from the bearing assembly.
The rotor assembly according to claim 1, wherein the bearing assembly comprises a shaft sleeve, and the impeller seat has a shape extending along the axial direction of the shaft sleeve and adhering to the hole wall of the first central through hole. bushing.
The rotor assembly of claim 2 wherein said impeller seat material comprises polyphenylene sulfide.
The rotor assembly of claim 1, wherein said bearing assembly comprises a bushing and a bearing;

The bearing has the first central through hole, the sleeve is sleeved on the bearing, and is in interference connection with the bearing;

The impeller seat wraps at least one of the end of the bearing and the end of the sleeve.
The rotor assembly of claim 4 wherein said bearings are graphite bearings.
The rotor assembly according to claim 4, wherein one of the outer wall of the bearing and the inner wall of the sleeve has a groove, and the other has a protrusion limited in the groove.
The rotor assembly according to claim 4, wherein at least one of the outer wall of the bearing and the outer wall of the sleeve has the first limiting portion.
The rotor assembly according to any one of claims 1-7, characterized in that, the side wall at the end of the bearing assembly has a plurality of first limiting portions in the circumferential direction, and the impeller seat has a The insertion groove at the end of the bearing assembly, the groove wall of the insertion groove has a plurality of second limiting parts in the circumferential direction, and the plurality of second limiting parts are respectively limited in a plurality of Inside the first limiting part.
The rotor assembly according to any one of claims 1-7, wherein the magnetic ring assembly comprises an iron core assembly, a first cover plate, a second cover plate and a sleeve;

The first cover plate, the iron core assembly, and the second cover plate are sequentially sleeved on the bearing assembly, the iron core assembly is in interference connection with the bearing assembly, and the first cover plate Both the inner circle and the inner circle of the second cover plate are sealed and fixedly connected with the bearing assembly;

The sleeve is sleeved on the iron core assembly, and the sleeve is respectively sealed and fixedly connected to the outer circle of the first cover plate and the outer circle of the second cover plate.
An electronic water pump, characterized in that the electronic water pump comprises a casing and the rotor assembly according to any one of claims 1-9;

The housing has an inner cavity and a rotating shaft located in the inner cavity, and the rotor assembly is accommodated in the inner cavity and rotatably sleeved on the rotating shaft.