Impeller rotor assembly, electronic water pump, thermal management system, and vehicle

Abstract

An impeller rotor assembly (100), comprising a rotor core (10) and a permanent magnet (20), the permanent magnet (20) penetrating into a permanent magnet (101) of the rotor core (10). The impeller rotor assembly (100) further comprises a rotor insulator (30), the rotor insulator (30) being an injection molded body. The rotor insulator (30) comprises an impeller part (301) and a rotor part (302) which are arranged in the axial direction and are connected to one another. The rotor part (302) is connected to the rotor core (10) and the permanent magnet (20) by means of injection molding. The rotor part (302) comprises a first part (3021). The first part (3021) partially covers the end surfaces of the rotor core (10) and the permanent magnet (20) facing away from the impeller part (301), and defines a first positioning hole (32) and a second positioning hole (33). An axial projection of the first positioning hole (32) partially coincides with an end surface of one end of the rotor core (10) in the axial direction such that the end surface of the one end of the rotor core (10) in the axial direction is partially exposed, and an axial projection of the second positioning hole (33) partially coincides with an end surface of one end of the permanent magnet (20) in the axial direction such that the end surface of the one end of the rotor core (10) in the axial direction is partially exposed. According to the described impeller rotor assembly, structural strength and stability are improved, and machining costs and difficulty are reduced.

Description

Impeller rotor assemblies, electronic water pumps, thermal management systems and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent applications No. 202410308445.X and No. 202420565969.2 filed by Anqing Welling Auto Parts Co., Ltd., Anhui Welling Auto Parts Co., Ltd. and Guangdong Welling Auto Parts Co., Ltd. on March 18, 2024. The entire contents of the above Chinese patent applications are hereby incorporated into this application by reference. Technical Field

[0003] The present application relates to the technical field of electronic water pumps, and more specifically, to an impeller rotor assembly, an electronic water pump, a thermal management system, and a vehicle. Background Art

[0004] Electronic water pumps are widely used due to their high efficiency and precise control. In related technologies, the impeller and rotor assembly of electronic water pumps is typically manufactured using a two-shot injection molding process. First, the core and permanent magnets are joined in a single injection molding process to form a single-shot molded part. Then, the impeller and the connection between the impeller and the single-shot molded part are formed in a second injection molding process. This two-shot molding process requires multiple steps and is costly. The joint between the two injection molding processes is susceptible to temperature fluctuations and is prone to cracking and deformation. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide an impeller rotor assembly that is injection molded in one step, has low processing cost, and stable structural performance.

[0006] Another object of the present application is to provide an electronic water pump having the above-mentioned impeller rotor assembly.

[0007] Another object of the present application is to provide a thermal management system having the above-mentioned electronic water pump.

[0008] Another object of the present application is to provide a vehicle having the above thermal management system.

[0009] According to an embodiment of the present application, the impeller rotor assembly includes: a rotor core and permanent magnets, wherein the permanent magnets are inserted into the permanent magnet slots of the rotor core; a rotor insulator, wherein the rotor insulator is an injection molded body, wherein the rotor insulator includes an impeller portion and a rotor portion arranged and connected in the axial direction, and the rotor portion is injection-molded to connect the rotor core and the permanent magnets; wherein the rotor portion includes a first part, wherein the first part partially covers the end surface of the rotor core and the permanent magnet facing away from the impeller portion and defines a first positioning hole and a second positioning hole, wherein the axial projection of the first positioning hole coincides with the end surface of one axial end of the rotor core so that the end surface of one axial end of the rotor core is partially exposed, and the axial projection of the second positioning hole coincides with the end surface of one axial end of the permanent magnet so that the end surface of one axial end of the rotor core is partially exposed.

[0010] According to the impeller rotor assembly of the embodiment of the present application, by setting the first positioning hole and the second positioning hole at the first part of the rotor part, the rotor insulator can be injection molded in one time, and the position accuracy of the rotor core and the permanent magnet is also good, which reduces the number and difficulty of injection molding, reduces the production cost of the rotor insulator, and improves the structural stability of the impeller rotor assembly, and has good reliability and economic value.

[0011] According to some embodiments of the present application, the outer diameter of the rotor core is larger than the outer diameter of the first part, and the end face of one axial end of the rotor core includes an annular axial support surface, which extends around the first part, and the rotor part includes a second part, which covers the rotor core and an end surface of the permanent magnet facing the impeller part.

[0012] According to some embodiments of the present application, a positioning groove is provided on the inner circumferential surface of the rotor core, the positioning groove extends axially and an end notch is formed on an axial end surface of the rotor core, the first part is provided with a third positioning hole, the third positioning hole is located on the side of the positioning groove axially away from the impeller part and the positioning groove is at least partially exposed.

[0013] According to some embodiments of the present application, the rotor portion includes a third part, which is connected to the inner circumferential surface of the rotor core, and the positioning groove includes a first slot segment and a second slot segment, the first slot segment is located on the side of the second slot segment away from the first part, and the outer circumferential surface of the third part is provided with a first connecting protrusion, the first connecting protrusion is embedded in the first slot segment, and the third positioning hole exposes the second slot segment.

[0014] According to some embodiments of the present application, the rotor part includes a third part, which is connected to the inner circumferential surface of the rotor core, and the axial ends of the third part are respectively connected to the first part and the impeller part, and the inner circumferential surface of the rotor core is provided with a connecting groove, and the connecting groove and the positioning groove are alternately arranged along the circumference of the third part, and the outer circumferential surface of the third part is provided with a second connecting protrusion embedded in the connecting groove.

[0015] According to some embodiments of the present application, the rotor portion includes a third part, which is connected to the inner circumference of the rotor core and defines an axial hole. A shaft sleeve is provided in the axial hole, and the rotor portion is injection-molded to the shaft sleeve.

[0016] According to some embodiments of the present application, the first part is annular, and a limiting protrusion is provided on the inner circumference of the first part, and the limiting protrusion stops on the side of the sleeve away from the impeller part; and / or, a recess is provided on the outer circumference of the sleeve, and a protrusion is embedded in the recess on the inner circumference of the third part.

[0017] According to some embodiments of the present application, an avoidance groove is provided on the end surface of the sleeve facing away from the first part, the third part is connected to the impeller part through a connecting part, the sleeve part is located in the space enclosed by the connecting part, and the inner circumferential surface of the connecting part is spaced apart from the outer circumferential surface of the sleeve, and the axial height of the part of the sleeve located in the space enclosed by the connecting part is greater than the depth of the avoidance groove.

[0018] According to some embodiments of the present application, the outer peripheral surface of the rotor core is at least partially exposed to the rotor insulator.

[0019] According to some embodiments of the present application, the impeller portion includes a first cover plate, and the impeller rotor assembly further includes a second cover plate, the second cover plate is arranged on a side of the impeller portion away from the rotor portion, a blade is arranged between the first cover plate and the second cover plate, and one of the first cover plate and the second cover plate is integrally injection molded with the blade.

[0020] According to some embodiments of the present application, there are multiple blades, and the first cover plate is provided with multiple gate grooves, and the multiple gate grooves and the multiple blades are alternately arranged along the circumference of the first cover plate.

[0021] According to some embodiments of the present application, the thickness of the first cover plate decreases in a direction away from the axis.

[0022] According to some embodiments of the present application, a side surface of the first cover plate facing the blade is perpendicular to the axis, a side surface of the first cover plate away from the blade is radially away from the axis and inclined axially toward the blade, and an angle between the two side surfaces of the first cover plate is less than or equal to 5°.

[0023] An electronic water pump according to an embodiment of the present application includes an impeller rotor assembly according to an embodiment of the present application.

[0024] A thermal management system according to an embodiment of the present application includes an electronic water pump according to an embodiment of the present application.

[0025] A vehicle according to an embodiment of the present application includes a thermal management system according to an embodiment of the present application.

[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] FIG1 is a bottom view of an impeller rotor assembly according to an embodiment of the present application;

[0029] FIG2 is a cross-sectional view taken along line AA in FIG1 ;

[0030] FIG3 is a partial cross-sectional view of FIG1;

[0031] FIG4 is a cross-sectional view taken along line BB in FIG1 ;

[0032] FIG5 is a schematic diagram of a shaft sleeve in an impeller rotor assembly according to an embodiment of the present application;

[0033] 6 is a cross-sectional view of an impeller rotor assembly and a second cover plate according to an embodiment of the present application;

[0034] FIG7 is a partial enlarged view of portion C in FIG6 ;

[0035] FIG8 is a schematic diagram of an impeller rotor assembly and a second cover plate according to an embodiment of the present application;

[0036] FIG9 is an exploded view of an impeller rotor assembly and a second cover plate according to an embodiment of the present application;

[0037] FIG10 is a schematic diagram of an impeller rotor assembly according to an embodiment of the present application;

[0038] FIG11 is a schematic diagram of a vehicle according to an embodiment of the present application.

[0039] Reference numerals:

[0040] Vehicle 1000; electronic water pump 200; thermal management system 300; impeller rotor assembly 100;

[0041] Rotor core 10; permanent magnet slot 101; annular axial support surface 102; positioning groove 103; first slot section 1031; second slot section 1032; connecting groove 104;

[0042] Permanent magnet 20;

[0043] Rotor insulator 30; impeller portion 301; first cover plate 3011; blades 3012; second cover plate 3013; gate groove 31; rotor portion 302; first portion 3021; ​​first positioning hole 32; second positioning hole 33; third positioning hole 34; second portion 3022; third portion 3023; first connecting protrusion 35; second connecting protrusion 36; shaft hole 37; limiting protrusion 38; protrusion 39; connecting portion 303;

[0044] Bushing 40; recess 41; avoidance groove 42. Modes for Carrying Out the Invention

[0045] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In the description of this application, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0048] The impeller rotor assembly 100 of the electronic water pump 200 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0049] 1 to 11 , the impeller rotor assembly 100 of the electronic water pump 200 according to an embodiment of the present application may include a rotor core 10 , permanent magnets 20 , and a rotor insulator 30 .

[0050] Specifically, permanent magnets 20 are disposed within permanent magnet slots 101 of the rotor core 10. Permanent magnets 20 are also referred to as magnetic steel, and for example, can be iron-cobalt-nickel magnetic steel. Multiple permanent magnet slots 101 are spaced apart along the circumference of the rotor core 10, and correspondingly, multiple permanent magnets 20 are also provided.

[0051] The rotor insulator 30 is an injection molded body, and includes an impeller portion 301 and a rotor portion 302 arranged and connected in the axial direction. In other words, the impeller portion 301 and the rotor portion 302 are integrally injection molded, and the impeller portion 301 is located on one axial side of the rotor portion 302. Specifically, the impeller portion 301 may include only the first cover plate 3011, and the first cover plate 3011 and the rotor portion 302 are injection molded as one piece; or, the impeller portion 301 may include the first cover plate 3011 and the blades 3012, and the blades 3012 are arranged on the side of the first cover plate 3011 facing away from the rotor portion 302, and the first cover plate 3011, the blades 3012 and the rotor portion 302 are injection molded as one piece; or, the impeller portion 301 may include the first cover plate 3011, the blades 3012 and the second cover plate 3013, and the blades 3012 are arranged between the first cover plate 3011 and the second cover plate 3013, and the first cover plate 3011 is connected to the rotor portion 302, and the first cover plate 3011, the blades 3012, the second cover plate 3013 and the rotor portion 302 are injection molded as one piece.

[0052] The rotor portion 302 is injection-molded to connect the rotor core 10 and the permanent magnet 20. That is, during the injection molding process, the rotor portion 302 is simultaneously connected to the rotor core 10 and the permanent magnet 20 and fixes the relative positions of the rotor core 10 and the permanent magnet 20.

[0053] The rotor portion 302 includes a first portion 3021, which partially covers the end surface of the rotor core 10 and the permanent magnet 20 facing away from the impeller portion 301 and defines a first positioning hole 32 and a second positioning hole 33. The axial projection of the first positioning hole 32 partially overlaps with the end surface of one axial end of the rotor core 10, so that the end surface of one axial end of the rotor core 10 is partially exposed. Here, the axial projection of the first positioning hole 32 partially overlaps with the end surface of one axial end of the rotor core 10. This can be that the entire axial projection of the first positioning hole 32 overlaps with a portion of the end surface of one axial end of the rotor core 10; or, it can be that a portion of the axial projection of the first positioning hole 32 overlaps with a portion of the end surface of one axial end of the rotor core 10. The setting of the first positioning hole 32 exposes a portion of the axial end surface of the rotor core 10. During injection molding, the mold used to mold the rotor insulator 30 can offset the exposed portion of the rotor core 10 to limit the axial position of the rotor core 10, reduce the possibility of axial movement of the rotor core 10 during the injection molding process, and help improve the accuracy of the position of the rotor core 10.

[0054] The axial projection of the second positioning hole 33 partially overlaps with the axial end surface of the permanent magnet 20, so that the axial end surface of the rotor core 10 is partially exposed. Here, the axial projection of the second positioning hole 33 partially overlaps with the axial end surface of the permanent magnet 20. It can be that the entire axial projection of the second positioning hole 33 overlaps with the axial end surface of the permanent magnet 20; or, a portion of the axial projection of the second positioning hole 33 overlaps with the axial end surface of the permanent magnet 20. The provision of the second positioning hole 33 can partially expose the axial end surface of the permanent magnet 20. During injection molding, the mold used to mold the rotor insulator 30 can offset the exposed portion of the permanent magnet 20 to achieve axial position limitation of the permanent magnet 20, reduce the possibility of axial movement of the permanent magnet 20 during the injection molding process, and ensure better position consistency of multiple permanent magnets 20.

[0055] In addition, the portion of the first part 3021 where the first positioning hole 32 and the second positioning hole 33 are not provided will cover a portion of the end surface of one axial end of the rotor core 10 and a portion of the end surface of one axial end of the permanent magnet 20 to connect and fix the permanent magnet 20 and the rotor core 10, thereby reducing the possibility of axial separation of the rotor part 302 from the permanent magnet 20 and the rotor core 10.

[0056] In some embodiments, for example, as shown in Figures 1 and 2, the first positioning hole 32 and the second positioning hole 33 can be the same through-hole; the first positioning hole 32 and the second positioning hole 33 can also be two separate through-holes spaced apart. The shapes of the first positioning hole 32 and the second positioning hole 33 can be elongated, circular, elliptical, arched, triangular, polygonal, or irregular, etc., all of which are within the scope of protection of this application. In particular, the first positioning hole 32 and the second positioning hole 33 are the same through-hole. In this way, the total contact area between the inner circumferential wall of the first positioning hole 32 and the second positioning hole 33 and the mold is smaller, making demolding easier.

[0057] In some embodiments, multiple first positioning holes 32 are provided and spaced apart along the circumference of the rotor core 10. For example, as shown in FIG1 , four first positioning holes 32 are provided, and the four first positioning holes 32 are symmetrically arranged about the central axis of the rotor core 10. For example, two first positioning holes 32 may be provided, and the two first positioning holes 32 are arranged axially symmetrically. For example, three, five, six, and so on, may also be provided, and this application does not impose specific limitations on this. This improves the positioning effect of the rotor core 10.

[0058] In some embodiments, there are multiple second positioning holes 33 and they are arranged in a one-to-one correspondence with the permanent magnets 20. It should be noted that there are usually multiple permanent magnets 20 and they are spaced apart along the circumference of the rotor core 10. Therefore, multiple second positioning holes 33 can be provided and correspond one-to-one with multiple permanent magnets 20 to achieve positioning of the multiple permanent magnets 20. Compared to the embodiment in which a single second positioning hole 33 is used to position multiple permanent magnets 20, multiple second positioning holes 33 are provided and correspond one-to-one with the permanent magnets 20. In this way, the cross-section of the first portion 3021 perpendicular to the axial direction is larger, and the first portion 3021 has a better support effect on the rotor core 10 and the permanent magnets 20.

[0059] In conventional concepts, the rotor insulator needs to completely cover the rotor core and the permanent magnets to prevent external gas or water from contacting the rotor core and the permanent magnets, causing the rotor core and the permanent magnets to rust. Therefore, in the related art, secondary injection molding is required to ensure that the injection molding body well covers the rotor core and the permanent magnets and that the rotor core and the permanent magnets are well positioned during the injection molding process. However, the casing for accommodating the impeller rotor assembly 100 usually has good sealing performance, and the rotor part 302 is usually immersed in antifreeze, which itself has anti-rust properties, high sealing reliability and long sealing effect. The rotor core 10 and the permanent magnet 20 are not easy to rust when in contact with water or air.

[0060] The present application breaks through the conventional understanding that the rotor insulator needs to completely cover the rotor core and permanent magnet, and innovatively directly sets a first positioning hole 32 and a second positioning hole 33 at the first part 3021 of the rotor part 302. The first positioning hole 32 and the second positioning hole 33 are respectively used to axially limit the rotor core 10 and the permanent magnet 20 during the injection molding process, thereby reducing the possibility of axial movement of the rotor core 10 and the permanent magnet 20, and at the same time enabling one-time injection molding of the rotor insulator 30 to be achieved, reducing processing costs and difficulty, improving the structural strength and stability of the impeller rotor assembly 100, and enhancing the performance of the electronic water pump 200.

[0061] According to the impeller rotor assembly 100 of the embodiment of the present application, by setting the first positioning hole 32 and the second positioning hole 33 at the first part 3021 of the rotor part 302, the rotor insulator 30 can be injection molded in one time, and the position accuracy of the rotor core 10 and the permanent magnet 20 is also good, which reduces the number and difficulty of injection molding, reduces the production cost of the rotor insulator 30, and improves the structural stability of the impeller rotor assembly 100, with good reliability and economic value.

[0062] According to some embodiments of the present application, as shown in FIG1 and FIG2 , the outer diameter of the rotor core 10 is greater than the outer diameter of the first portion 3021, and the end surface of one axial end of the rotor core 10 includes an annular axial support surface 102, which extends around the first portion 3021. During the injection molding process of the impeller rotor assembly 100 of the embodiment of the present application, the mold and the annular axial support surface 102 of the rotor core 10 are abutted to achieve axial positioning of the rotor core 10. By providing the annular axial support surface 102 to position the axial position of the rotor core 10, the annular axial support surface 102 is closer to the outer circumferential surface of the rotor core 10, which improves the positioning stability of the rotor core 10 and helps further increase the stability of the axial positioning of the rotor core 10.

[0063] It should be noted that the rotor core 10 is formed by stacking multiple punching sheets. The axial size tolerance of the rotor core 10 is much larger than the tolerance of the mold. During the injection molding process, the mold may be damaged if it forcibly presses the axial end faces of the rotor core 10.

[0064] In the present application, as shown in Figures 2, 4, and 6, the rotor portion 302 includes a second portion 3022, which covers the end surface of the rotor core 10 and the permanent magnet 20 facing the impeller portion 301. In other words, during injection molding, the mold does not abut against the end surface of the rotor core 10 and the permanent magnet 20 facing the impeller portion 301, but only against the end surface of the rotor core 10 and the permanent magnet 20 facing away from the impeller portion 301. The rubber fills the gap between the mold and the end surface of the rotor core 10 facing the impeller portion 301. This reduces the possibility of injection molding failure due to dimensional mismatch between the mold and the rotor core 10.

[0065] According to some embodiments of the present application, as shown in FIG. 1 and FIG. 2 , the inner circumferential surface of the rotor core 10 is provided with a positioning groove 103. The positioning groove 103 extends axially and has an end notch formed on one axial end surface of the rotor core 10. The first portion 3021 is provided with a third positioning hole 34. The third positioning hole 34 is located on a side of the positioning groove 103 axially away from the impeller portion 301, leaving the positioning groove 103 at least partially exposed. In other words, during the injection molding process, the mold partially fills the positioning groove 103 to position the rotor core 10 radially and circumferentially, reducing radial and circumferential movement of the rotor core 10 during the casting process and improving the accuracy of the relative position between the rotor core 10 and the rotor insulator 30.

[0066] Specifically, the positioning groove 103 may be at least partially exposed, and multiple positioning grooves 103 may be provided along the circumference of the rotor core 10, and some of the multiple positioning grooves 103 are exposed; or, the axial end portion of the positioning groove 103 close to the first part 3021 may be partially exposed.

[0067] Specifically, the third positioning hole 34, the first positioning hole 32, and the second positioning hole 33 can be the same through-hole; alternatively, the third positioning hole 34, the first positioning hole 32, and the second positioning hole 33 can each be a separate through-hole, all of which fall within the scope of protection of this application. If the first positioning hole 32, the second positioning hole 33, and the third positioning hole 34 are the same through-hole, the total contact area between the inner circumferential walls of the first positioning hole 32, the second positioning hole 33, and the third positioning hole 34 and the mold is smaller, making demolding easier.

[0068] According to some embodiments of the present application, as shown in FIG. 2 and FIG. 6 , the rotor portion 302 includes a third portion 3023 connected to the inner circumferential surface of the rotor core 10. The positioning groove 103 includes a first slot segment 1031 and a second slot segment 1032. The first slot segment 1031 is located on the side of the second slot segment 1032 away from the first portion 3021. The outer circumferential surface of the third portion 3023 is provided with a first connecting protrusion 35, which is embedded in the first slot segment 1031. During operation of the impeller rotor assembly 100, the rotor core 10 rotates at high speed, thereby driving the rotor insulator 30 to rotate at high speed. The first connecting protrusion 35 is embedded in the first slot segment 1031. This increases the connection area between the third portion 3023 and the rotor core 10, strengthens the connection between the third portion 3023 and the rotor core 10, improves torque transmission, and reduces the possibility of asynchronous rotation of the rotor core 10 and the rotor insulator 30.

[0069] In addition, the third positioning hole 34 exposes the second slot section 1032. It is understandable that the second slot section 1032 and the permanent magnet 20 are both provided on the rotor core 10. Therefore, the positional correspondence between the second slot section 1032 and the permanent magnet 20 is uniquely determined. After injection molding is completed, the magnetization process begins. The second slot section 1032 can be used to position the permanent magnet 20. Based on the position of the permanent magnet 20, the magnetization position of the permanent magnet 20 can be accurately located, thereby improving the accuracy of magnetization and ensuring that the permanent magnet 20 is fully magnetized. Because the second slot section 1032 is provided on the rotor core 10, the second slot section 1032 has high hardness and is less likely to deform due to temperature changes. Therefore, the positioning accuracy is higher, which is conducive to improving the magnetization accuracy.

[0070] According to some embodiments of the present application, as shown in FIG. 4 , the rotor portion 302 includes a third portion 3023 connected to the inner circumference of the rotor core 10. The axial ends of the third portion 3023 are respectively connected to the first portion 3021 and the impeller portion 301, so that the first portion 3021, the third portion 3023, and the impeller portion 301 can be integrally injection molded. A connecting groove 104 is provided on the inner circumference of the rotor core 10, and a second connecting protrusion 36 is provided on the outer circumference of the third portion 3023, which engages within the connecting groove 104. The connection groove 104 and the second connecting protrusion 36 cooperate to increase the connection area between the third portion 3023 and the rotor core 10, strengthen the connection between the third portion 3023 and the rotor core 10, improve torque transmission, and reduce the possibility of asynchronous rotation of the rotor core 10 and the rotor insulator 30.

[0071] In some embodiments, as shown in Figure 3, there are multiple connecting grooves 104, and the connecting grooves 104 and the positioning grooves 103 are alternately arranged along the circumference of the third part 3023. In this way, the rotor core 10 has better uniformity in the circumferential direction, the impeller rotor assembly 100 has better dynamic balancing effect, and the electronic water pump 200 is not prone to abnormal noise and damage during operation.

[0072] In some embodiments, multiple connecting grooves 104 may be provided between adjacent positioning grooves 103, and multiple positioning grooves 103 may be provided between adjacent connecting grooves 104, wherein the multiple connecting grooves 104 of the rotor core 10 are arranged in a centrally symmetrical manner, and the multiple positioning grooves 103 of the rotor core 10 are arranged in a centrally symmetrical manner.

[0073] According to some embodiments of the present application, as shown in Figures 1 to 6 , the rotor portion 302 includes a third portion 3023 . The third portion 3023 is connected to the inner circumference of the rotor core 10 and defines an axial hole 37 . A shaft sleeve 40 is disposed within the shaft hole 37 . The rotor portion 302 and the shaft sleeve 40 are injection-molded together. In other words, the rotor insulator 30 is integrally injection-molded while also being connected to the shaft sleeve 40 . This eliminates the need for secondary assembly or connection between the shaft sleeve 40 and the rotor insulator 30 , saving process steps and reducing processing costs.

[0074] Specifically, the sleeve 40 is used to mount the impeller rotor assembly 100 on the rotating shaft. Specifically, a stopper is provided on the pump cover or the end of the rotating shaft of the electronic water pump 200 near the impeller portion 301. The stopper abuts against the side of the sleeve 40 near the impeller portion 301. The stopper acts as a thrust stop, limiting the axial position of the sleeve 40 so that the sleeve 40 can be mounted on the rotating shaft.

[0075] In some embodiments, as shown in Figures 1 and 4 , the first portion 3021 is annular, with a stopper protrusion 38 disposed along its inner circumference. The stopper protrusion 38 abuts the side of the sleeve 40 away from the impeller portion 301. During operation, the sleeve 40 is subjected to an axial force acting away from the impeller portion 301. The stopper protrusion 38 abuts the side of the sleeve 40 away from the impeller portion 301, thereby supporting the end of the sleeve 40 away from the impeller portion 301 and reducing the possibility of the sleeve 40 moving away from the impeller portion 301 relative to the rotor insulator 30. For example, a single stopper protrusion 38 may be annular, or multiple stopper protrusions 38 may be spaced apart along the inner circumference of the first portion 3021. The inner circumference of the stopper protrusion 38 gradually slopes outward from the impeller portion 301 to the rotor portion 302, facilitating demolding.

[0076] In some embodiments, as shown in Figures 2 and 5 , the outer circumferential surface of the sleeve 40 is provided with a recess 41, and the inner circumferential surface of the third portion 3023 is provided with a protrusion 39 that engages with the recess 41. This increases the connection area between the sleeve 40 and the third portion 3023, enhancing the connection strength between the sleeve 40 and the third portion 3023. It also constrains the sleeve 40 from circumferential rotation and axial movement relative to the third portion 3023, thereby improving the connection stability between the sleeve 40 and the third portion 3023. For example, two, three, four, or other symmetrical recesses 41 may be provided. The cross-sectional area of ​​the recess 41 perpendicular to the axial direction may be rectangular, sector-shaped, arc-shaped, or the like, without specific limitation herein.

[0077] In some embodiments, the outer circumference of the sleeve 40 may also be provided with a protrusion 39 , and the inner circumference of the third portion 3023 may be provided with a recess 41 for embedding the protrusion 39 .

[0078] In some embodiments, as shown in Figures 5 to 7 , the end surface of the sleeve 40 facing away from the first portion 3021 is provided with an escape groove 42. It should be noted that when the electronic water pump 200 is in operation, the end surface of the sleeve 40 facing away from the first portion 3021 will rotate and rub against the thrust surface of the stopper. The provision of the escape groove 42 allows liquid to enter the escape groove 42 to provide lubrication, thereby reducing friction between the sleeve 40 and the thrust surface.

[0079] 5 to 7 , the third portion 3023 is connected to the impeller portion 301 via the connecting portion 303. The sleeve 40 is partially located within the space enclosed by the connecting portion 303, and the inner circumferential surface of the connecting portion 303 is spaced apart from the outer circumferential surface of the sleeve 40. The axial height D2 of the portion of the sleeve 40 located within the space enclosed by the connecting portion 303 is greater than the depth D2 of the avoidance groove 42. Thus, during injection molding, the mold can be positioned between the inner circumferential surface of the connecting portion 303 and the outer circumferential surface of the sleeve 40 within the space enclosed by the connecting portion 303. Furthermore, the mold contacts the outer circumferential surface of the sleeve 40, completely encasing the portion of the sleeve 40 located within the space enclosed by the connecting portion 303. Furthermore, the axial height of the portion of the sleeve 40 located within the space enclosed by the connecting portion 303 is greater than the depth of the avoidance groove 42. Therefore, the rubber cannot enter the avoidance groove 42, and the effectiveness of the avoidance groove 42 is not easily affected. In a specific embodiment, the difference between the axial height of the portion of the sleeve 40 located in the space enclosed by the connecting portion 303 and the depth of the avoidance groove 42 may be 0.5 mm.

[0080] According to some embodiments of the present application, at least a portion of the outer circumference of the rotor core 10 is exposed outside the rotor insulator 30. For example, the portion of the outer circumference of the rotor core 10 near the impeller portion 301 is exposed outside the rotor insulator 30; alternatively, the portion of the outer circumference of the rotor core 10 away from the impeller portion 301 is exposed outside the rotor insulator 30; or alternatively, the entire outer circumference of the rotor core 10 is exposed outside the rotor insulator 30. In this way, the portion of the rotor core 10 exposed outside the rotor insulator 30 contacts the mold during injection molding, providing a certain positioning effect and reducing the possibility of movement of the rotor core 10.

[0081] The entire outer circumference of the rotor core 10 is exposed to the rotor insulator 30 (for example, as shown in Figures 2, 4, and 6). It should be noted that the electronic water pump 200 includes a housing, within which a stator assembly is embedded and has a mounting cavity. The stator assembly surrounds the mounting cavity, and the rotor portion 302 is positioned within the mounting cavity, enabling the impeller rotor assembly 100 to cooperate with the stator assembly and rotate under the action of the stator assembly. The entire outer circumference of the rotor core 10 is exposed to the rotor insulator 30. This reduces the radial gap between the rotor core 10 and the stator assembly, reducing the air gap and improving the performance of the electronic water pump 200.

[0082] According to some embodiments of the present application, as shown in Figures 4, 6, 8, and 9, the impeller portion 301 includes a first cover plate 3011, and the impeller-rotor assembly 100 further includes a second cover plate 3013. The second cover plate 3013 is disposed on a side of the impeller portion 301 away from the rotor portion 302. Blades 3012 are disposed between the first cover plate 3011 and the second cover plate 3013. One of the first cover plate 3011 and the second cover plate 3013 is integrally injection-molded with the blades 3012. For example, the first cover plate 3011 and the blades 3012 are integrally injection-molded, and the second cover plate 3013 is welded or plug-connected to the blades 3012; or the second cover plate 3013 and the blades 3012 are integrally injection-molded, and the first cover plate 3011 and the blades 3012 are welded or plug-connected to achieve efficient assembly of the impeller portion 301.

[0083] In some embodiments, as shown in FIG. 10 , there are multiple blades 3012, and the first cover plate 3011 is provided with multiple gate grooves 31. That is, the gate of the mold is close to the second portion 3022 and away from the first portion 3021. During injection molding, the rubber compound flows through the end of the rotor core 10 facing the impeller portion 301 to the end of the rotor core 10 facing away from the impeller portion 301. As the rubber compound flows, it applies a force to the rotor core 10, causing the end surface of the rotor core 10 facing away from the impeller portion 301 to press against the mold, thereby reducing the possibility of axial movement of the rotor core 10.

[0084] In an embodiment where the blades 3012 and the first cover plate 3011 are integrally injection molded, the first cover plate 3011 is provided with a plurality of gate grooves 31. These gate grooves 31 and the blades 3012 are arranged alternately along the circumference of the first cover plate 3011. In other words, a gate is provided between each adjacent blade 3012. This ensures that the injection-molded blades 3012 have high precision and a high yield, and are less susceptible to problems such as material shortages. For example, in one specific embodiment, as shown in FIG10 , seven blades 3012 and seven gate grooves 31 are provided.

[0085] In some embodiments, the thickness of the first cover plate 3011 decreases as it moves away from the axis. This reduces the risk of warping of the first cover plate 3011. For example, as shown in FIG8 , the surface of the first cover plate 3011 facing the blades 3012 is perpendicular to the axis, the surface of the first cover plate 3011 facing away from the blades 3012 is radially away from the axis and tilted axially toward the blades 3012, and the angle a between the two side surfaces of the first cover plate 3011 is less than or equal to 5°. For example, the surface of the first cover plate 3011 facing away from the blades 3012 is perpendicular to the axis, the surface of the first cover plate 3011 facing away from the blades 3012 is radially away from the axis and tilted axially toward the blades 3012.

[0086] Specifically, the angle between the two side surfaces of the first cover plate 3011 can be 5°, 4°, 3°, 2°, 1°, or any value between any two of these values.

[0087] The impeller rotor assembly 100 according to a specific embodiment of the present application is described in detail below with reference to the accompanying drawings. It is worth noting that the following description is merely illustrative and should not be construed as limiting the application.

[0088] As shown in Figures 1 to 10, the impeller rotor assembly 100 according to some embodiments of the present application includes a rotor core 10, a permanent magnet 20, a rotor insulator 30 and a sleeve 40. The permanent magnet 20 is inserted into the permanent magnet slot 101 of the rotor core 10; the rotor insulator 30 is an injection molded body, and the rotor insulator 30 includes an impeller portion 301 and a rotor portion 302 arranged and connected in the axial direction. The rotor portion 302 is injection molded to connect the rotor core 10 and the permanent magnet 20; wherein the rotor portion 302 includes the first A portion 3021 is provided. The first portion 3021 partially covers the end surfaces of the rotor core 10 and the permanent magnets 20 facing away from the impeller portion 301 and defines a first positioning hole 32 and a second positioning hole 33. The axial projection of the first positioning hole 32 partially overlaps with the end surface of one axial end of the rotor core 10, thereby exposing the end surface of the rotor core 10. The axial projection of the second positioning hole 33 partially overlaps with the end surface of one axial end of the permanent magnets 20, thereby exposing the end surface of the rotor core 10. The rotor portion 302 includes a third portion 3023. The third portion 3023 is connected to the inner circumferential surface of the rotor core 10 and defines an axial hole 37. A shaft sleeve 40 is disposed within the shaft hole 37. The rotor portion 302 and the shaft sleeve 40 are injection-molded together.

[0089] The outer diameter of the rotor core 10 is larger than the outer diameter of the first part 3021, and the end face of one axial end of the rotor core 10 includes an annular axial support surface 102, which extends around the first part 3021. The rotor part 302 includes a second part 3022, which covers the rotor core 10 and the permanent magnet 20 at one end surface facing the impeller part 301.

[0090] During injection molding, the permanent magnets 20 are installed in the rotor core 10 and then placed in an injection molding machine together with the sleeve 40 to form the impeller rotor assembly 100 through a single injection molding process. The rotor insulator 30 covers the rotor core 10, the permanent magnets 20, and the sleeve 40. The present application only requires a single injection molding process to obtain the impeller rotor assembly 100, greatly simplifying the processing technology and processing costs of the impeller rotor assembly 100.

[0091] During injection molding, the mold and the partially exposed axial end face of the rotor core 10 and the annular axial support surface 102 are in contact with each other to support the rotor core 10 in the axial direction, thereby reducing the possibility of axial movement of the rotor core 10. At the same time, because the rotor core 10 is formed by stacking punching sheets one by one, the height tolerance is generally around plus or minus 0.5 mm, which is much larger than the tolerance of the mold. Therefore, there may be a problem of mismatch between the corresponding dimensions of the rotor core 10 and the mold. The mold forcibly presses the two end faces of the rotor core 10, which may damage the mold. In the present application, the second part 3022 covers the rotor core 10 and the end surface of the permanent magnet 20 facing the impeller part 301, that is, the rotor core 10 is supported only by the end surface of the rotor core 10 away from the impeller part 301. The end surface of the rotor core 10 facing the impeller part 301 is completely sealed by the rubber material and does not contact the mold. The larger or smaller axial dimensions of the rotor core 10 have little effect on the mold. The mold abuts against the partially exposed axial end surface of the permanent magnet 20 to reduce the possibility of axial movement of the permanent magnet 20 during the injection molding process.

[0092] The inner circumference of the rotor core 10 is provided with a positioning groove 103. The positioning groove 103 extends axially and has an end notch formed at one axial end surface of the rotor core 10. The first portion 3021 is provided with a third positioning hole 34. The third positioning hole 34 is located on the side of the positioning groove 103 axially away from the impeller portion 301, leaving at least a portion of the positioning groove 103 exposed. The rotor portion 302 includes a third portion 3023, which is connected to the inner circumference of the rotor core 10. The positioning groove 103 includes a first slot segment 1031 and a second slot segment 1032. The first slot segment 1031 is located on the side of the second slot segment 1032 away from the first portion 3021. The outer circumference of the third portion 3023 is provided with a first connecting protrusion 35, which is embedded in the first slot segment 1031. The third positioning hole 34 leaves the second slot segment 1032 exposed. The partially exposed positioning groove 103 can cooperate with the mold to achieve the circumferential positioning of the rotor core 10, reducing the possibility of the rotor core 10 rotating relative to the mold. After injection molding is completed, in the next magnetization process, the second groove section 1032 can also be used to position the permanent magnet 20. Because the positioning groove 103 is opened in the rotor core 10, the dimensional accuracy of the rotor core 10 is higher than the dimensional accuracy of the plastic. Therefore, the second groove section 1032 facilitates high-precision positioning of the permanent magnet 20 and improves magnetization accuracy.

[0093] The rotor portion 302 includes a third portion 3023, which is connected to the inner circumference of the rotor core 10. Its axial ends are connected to the first portion 3021 and the impeller portion 301, respectively. The inner circumference of the rotor core 10 is provided with connecting grooves 104, which are arranged alternately with the positioning grooves 103 along the circumference of the third portion 3023. The outer circumference of the third portion 3023 is provided with second connecting protrusions 36 that engage with the connecting grooves 104. During operation, the rotor core 10 rotates at high speed, simultaneously rotating with the connecting grooves 104 and the second connecting protrusions 36, driving the impeller portion 301 to rotate. The provision of the connecting grooves 104 and the second connecting protrusions 36 increases the contact area between the rotor portion 302 and the rotor core 10, thereby enhancing torque transmission.

[0094] The first portion 3021 is annular and has a stopper protrusion 38 on its inner circumference. This stopper protrusion 38 abuts the side of the sleeve 40 away from the impeller 301. The outer circumference of the sleeve 40 is provided with a recess 41, and the inner circumference of the third portion 3023 is provided with a protrusion 39 that engages with the recess 41. This supports the sleeve 40 and prevents it from rotating. The stopper protrusion 38 effectively prevents axial movement of the sleeve 40.

[0095] The end surface of the sleeve 40 facing away from the first portion 3021 is provided with an escape groove 42. The third portion 3023 is connected to the impeller portion 301 via the connecting portion 303. The sleeve 40 is partially located within the space enclosed by the connecting portion 303, and the inner circumferential surface of the connecting portion 303 is spaced apart from the outer circumferential surface of the sleeve 40. The axial height of the portion of the sleeve 40 located within the space enclosed by the connecting portion 303 is greater than the depth of the escape groove 42. The escape groove 42 is provided to improve the friction performance between the end surface of the sleeve 40 facing away from the first portion 3021 and the thrust surface. However, during injection molding, the rubber material may enter the escape groove 42. In order to seal the escape groove 42 and prevent the rubber material from flowing into the escape groove 42 during injection molding, in this application, the portion of the sleeve 40 located within the space enclosed by the connecting portion 303 contacts the mold to achieve sealing and prevent the material from flowing into the escape groove 42.

[0096] The outer circumferential surface of the rotor core 10 is at least partially exposed to the rotor insulator 30 . Here, the gap between the rotor core 10 and the stator assembly is smaller, which is beneficial to enhancing the performance of the electronic water pump 200 .

[0097] The impeller portion 301 includes a first cover plate 3011. The impeller-rotor assembly 100 also includes a second cover plate 3013. The second cover plate 3013 is disposed on a side of the impeller portion 301 away from the rotor portion 302. Blades 3012 are disposed between the first and second cover plates 3011 and 3013. The first cover plate 3011 and blades 3012 are integrally injection-molded, and the second cover plate 3013 is welded to the blades 3012. There are multiple blades 3012, and the first cover plate 3011 is provided with multiple gate grooves 31. The gate grooves 31 and the blades 3012 are arranged alternately along the circumference of the first cover plate 3011. For example, seven blades 3012 have seven gate grooves 31, and a gate is disposed between each two adjacent blades 3012. This injection-molded blade 3012 has high precision and a high yield, and is less likely to suffer from problems such as material shortages. In addition, the gate groove 31 is provided on the first cover plate 3011, that is, the flow direction of the rubber material generally flows from the impeller part 301 to the rotor part 302. In this way, when the rubber material is filled into the mold, it will apply a force toward the first part 3021 to the rotor core 10, thereby making it difficult for the rotor core 10 to move axially.

[0098] The surface of the first cover plate 3011 facing the blades 3012 is perpendicular to the axis, and the surface of the first cover plate 3011 facing away from the blades 3012 is radially away from the axis and tilted axially toward the blades 3012. The angle between the two side surfaces of the first cover plate 3011 is less than or equal to 5°. In the related art, the surface of the first cover plate facing away from the blades and the surface of the first cover plate facing the blades are perpendicular to the axis. This injection-molded first cover plate is prone to warping. In the present application, the surface of the first cover plate 3011 facing away from the blades 3012 is radially away from the axis and tilted axially toward the blades 3012, forming a taper that acts like a reinforcing rib, greatly alleviating the problem of severe deformation of the first cover plate 3011.

[0099] As shown in FIG11 , the electronic water pump 200 according to the embodiment of the present application includes the impeller-rotor assembly 100 according to the embodiment of the present application. Since the impeller-rotor assembly 100 according to the embodiment of the present application has the aforementioned beneficial technical effects, the electronic water pump 200 according to the embodiment of the present application, by providing the first positioning hole 32 and the second positioning hole 33 in the first portion 3021 of the rotor portion 302, allows the rotor insulator 30 to be injection molded in one step, and the positioning accuracy of the rotor core 10 and the permanent magnet 20 is also improved, thereby reducing the number of injection molding cycles and the difficulty, and reducing the production cost of the rotor insulator 30. The impeller-rotor assembly 100 also has better structural stability, and has good reliability and economic value.

[0100] As shown in FIG11 , the thermal management system 300 according to an embodiment of the present application includes the electronic water pump 200 according to an embodiment of the present application. Because the electronic water pump 200 according to an embodiment of the present application has the aforementioned beneficial technical effects, the thermal management system 300 according to an embodiment of the present application, by providing the first positioning hole 32 and the second positioning hole 33 in the first portion 3021 of the rotor portion 302, allows the rotor insulator 30 to be injection molded in a single step, and the positioning accuracy of the rotor core 10 and the permanent magnet 20 is also improved. This reduces the number of injection molding cycles and the difficulty, lowers the production cost of the rotor insulator 30, and improves the structural stability of the impeller-rotor assembly 100, thereby providing good reliability and economic value.

[0101] In some embodiments, the thermal management system 300 is an important component for regulating the vehicle cabin environment (temperature, humidity, etc.) and the working environment of other components. The thermal management system 300 mainly includes: valves, heat exchangers, compressors and pumps, such as the electronic water pump 200 or other water pumps, and the thermal management system 300 has a circulating refrigerant.

[0102] As shown in FIG11 , a vehicle 1000 according to an embodiment of the present application includes a thermal management system 300 according to an embodiment of the present application. Because the thermal management system 300 according to an embodiment of the present application has the aforementioned beneficial technical effects, the vehicle 1000 according to an embodiment of the present application, by providing the first positioning hole 32 and the second positioning hole 33 in the first portion 3021 of the rotor portion 302, allows the rotor insulator 30 to be injection molded in a single step, and the positioning accuracy of the rotor core 10 and the permanent magnet 20 is also improved. This reduces the number of injection molding cycles and the difficulty, lowers the production cost of the rotor insulator 30, and improves the structural stability of the impeller rotor assembly 100, thereby providing excellent reliability and economic value.

[0103] Among them, vehicle 1000 can be a new energy vehicle. In some embodiments, the new energy vehicle can be a pure electric vehicle with an electric motor as the main driving force. In other embodiments, the new energy vehicle can also be a hybrid vehicle with an internal combustion engine and an electric motor as the main driving force. Regarding the internal combustion engine and the electric motor mentioned in the above embodiments that provide driving power for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy to the electric motor can use power batteries, hydrogen fuel cells, etc., and there is no special limitation here. It should be noted that this is only an exemplary description of the structure of new energy vehicles, etc., and it does not limit the scope of protection of this application.

[0104] Other structures and operations of the electronic water pump 200 , the thermal management system 300 , and the vehicle 1000 according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0105] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0106] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An impeller rotor assembly, wherein: include: A rotor core and a permanent magnet, wherein the permanent magnet is inserted into a permanent magnet slot of the rotor core; A rotor insulator, the rotor insulator being an injection-molded body, comprising an impeller portion and a rotor portion arranged and connected in the axial direction, the rotor portion being injection-molded to connect the rotor core and the permanent magnet; In which, the rotor part includes a first part, which partially covers the rotor core and the end surface of the permanent magnet facing away from the impeller part and defines a first positioning hole and a second positioning hole, the axial projection of the first positioning hole coincides with the axial end surface of the rotor core so that the axial end surface of the rotor core is partially exposed, and the axial projection of the second positioning hole coincides with the axial end surface of the permanent magnet so that the axial end surface of the rotor core is partially exposed.

2. The impeller rotor assembly according to claim 1, wherein: The outer diameter of the rotor core is larger than the outer diameter of the first part, and the end surface of one axial end of the rotor core includes an annular axial support surface, which extends around the first part. The rotor part includes a second part, which covers the rotor core and an end surface of the permanent magnet facing the impeller part.

3. The impeller rotor assembly according to claim 1 or 2, wherein: The inner circumferential surface of the rotor core is provided with a positioning groove, which extends axially and has an end notch formed on an axial end surface of the rotor core. The first part is provided with a third positioning hole, which is located on the side of the positioning groove axially away from the impeller part and makes the positioning groove at least partially exposed.

4. The impeller rotor assembly according to claim 3, wherein: The rotor portion includes a third part, which is connected to the inner circumferential surface of the rotor core. The positioning groove includes a first slot segment and a second slot segment. The first slot segment is located on a side of the second slot segment away from the first portion. A first connecting protrusion is provided on the outer circumferential surface of the third part. The first connecting protrusion is embedded in the first slot segment. The third positioning hole exposes the second slot segment.

5. The impeller rotor assembly according to claim 3 or 4, wherein: The rotor part includes a third part, which is connected to the inner circumferential surface of the rotor core. The axial ends of the third part are respectively connected to the first part and the impeller part. The inner circumferential surface of the rotor core is provided with a connecting groove. The connecting groove and the positioning groove are alternately arranged along the circumference of the third part. The outer circumferential surface of the third part is provided with a second connecting protrusion embedded in the connecting groove.

6. The impeller rotor assembly according to any one of claims 1 to 5, wherein: The rotor part includes a third portion, the third portion is connected to the inner circumferential surface of the rotor core and defines an axial hole, a shaft sleeve is provided in the axial hole, and the rotor part is injection-molded connected to the shaft sleeve.

7. The impeller rotor assembly according to claim 6, wherein: The first part is annular, and a limiting protrusion is provided on the inner circumference of the first part, and the limiting protrusion stops on the side of the sleeve away from the impeller part; and / or, a recess is provided on the outer circumference of the sleeve, and a protrusion is embedded in the recess on the inner circumference of the third part.

8. The impeller rotor assembly according to claim 6 or 7, wherein: An avoidance groove is provided on the end surface of the sleeve facing away from the first part, the third part is connected to the impeller part through a connecting part, the sleeve part is located in the space enclosed by the connecting part, and the inner circumferential surface of the connecting part is spaced apart from the outer circumferential surface of the sleeve, and the axial height of the part of the sleeve located in the space enclosed by the connecting part is greater than the depth of the avoidance groove.

9. The impeller rotor assembly according to any one of claims 1 to 8, wherein: The outer peripheral surface of the rotor core is at least partially exposed to the rotor insulator.

10. The impeller rotor assembly according to any one of claims 1 to 9, wherein: The impeller part includes a first cover plate, and the impeller rotor assembly also includes a second cover plate, the second cover plate is arranged on a side of the impeller part away from the rotor part, a blade is arranged between the first cover plate and the second cover plate, and one of the first cover plate and the second cover plate is injection molded integrally with the blade.

11. The impeller rotor assembly according to claim 10, wherein: There are a plurality of blades, and the first cover plate is provided with a plurality of gate grooves, and the plurality of gate grooves and the plurality of blades are alternately arranged along the circumference of the first cover plate.

12. The impeller rotor assembly according to claim 10 or 11, wherein: The thickness of the first cover plate decreases in a direction away from the axis.

13. The impeller rotor assembly according to claim 12, wherein: The side surface of the first cover plate facing the blade is perpendicular to the axis, the side surface of the first cover plate away from the blade is radially away from the axis and inclined axially toward the blade, and the angle between the two side surfaces of the first cover plate is less than or equal to 5°.

14. An electronic water pump, wherein: The invention comprises an impeller rotor assembly according to any one of claims 1 to 13.

15. A thermal management system, wherein: Comprising the electronic water pump according to claim 14.

16. A vehicle, wherein Comprising the thermal management system of claim 15 .

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