Stator assembly and electronic water pump thereof

Abstract

The utility model relates to the technical field of water pumps, in particular to a stator assembly and an electronic water pump thereof. The stator assembly comprises a stator iron core, a first framework and a grounding pin, the first framework is connected with the stator iron core, a fixing hole is formed in the first framework, at least part of the grounding pin is fixed in the fixing hole, and at least part of the grounding pin abuts against the first framework and the stator iron core along the two ends of the axial direction of the stator iron core respectively. Therefore, the first framework is used for fixing the grounding pin, and the grounding pin penetrates through the fixing hole, so that the connection strength of the first framework and the grounding pin is high, the grounding pin is limited more firmly, and the situation that the grounding pin is not tightly connected with the stator core after shaking and shifting is avoided.

Description

Stator assembly and its electric water pump Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a stator assembly and its electronic water pump. Background Technology

[0002] As a crucial component of automotive thermal management systems, the electric water pump's primary function is to cool the engine, turbocharger, battery, motor, and controllers. The stator assembly, a vital part of the electric water pump, has a magnetic saturation strength that is closely related to the pump's operational stability.

[0003] A stator assembly typically consists of a stator core and a grounding pin. The grounding pin is electrically connected to the stator core and is used for grounding, thereby reducing electromagnetic interference and ensuring the stable operation of the stator assembly. However, the grounding pin is prone to poor contact with the stator core due to its own positional wobble and offset, which can lead to magnetic circuit discontinuities and reduce the magnetic saturation intensity of the stator core. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides an electronic water pump.

[0005] A stator assembly includes: a stator core; a first frame connected to the stator core, the first frame having a fixing hole; and a grounding pin, at least a portion of the grounding pin being fixed in the fixing hole, and the two ends of the grounding pin along the axial direction of the stator core respectively abutting against the first frame and the stator core.

[0006] With this configuration, the first frame is used to fix the grounding pin, and the grounding pin passes through the fixing hole, which makes the connection between the first frame and the grounding pin strong, and the grounding pin is more firmly limited, so as to avoid the grounding pin shaking and shifting and the connection with the stator core being not tight enough.

[0007] In one embodiment, the grounding pin includes a first part and a second part, the first part and the second part are connected and the first part and the second part are set at an angle, the first part is inserted into the fixing hole and electrically connected to an external conductive element, and the second part is in surface contact with the axial end face of the stator core.

[0008] In one embodiment, the fixing hole extends along the axial direction of the first frame, and the first frame is also provided with a fixing groove extending radially. The fixing groove communicates with the fixing hole. The second part is located in the fixing groove and is perpendicular to the first part. The side of the second part away from the first part abuts against the stator core.

[0009] In one embodiment, the first frame includes a frame body and a grounding boss. The grounding boss is connected to the frame body and extends along the axial direction of the first frame. The fixing hole is formed in the grounding boss and extends through both ends of the grounding boss in the length direction. The fixing groove is formed in the frame body. The side of the frame body away from the grounding boss abuts against the stator core.

[0010] In one embodiment, the stator assembly further includes a stator pin, a pin slot is provided on one side of the first frame, the stator pin is engaged in the pin slot and partially extends out of the pin slot, the portion of the stator pin extending out of the pin slot is electrically connected to an external conductive element, and the stator pin and the first portion are located on the same side in the axial direction of the first frame.

[0011] In one embodiment, the stator pin includes a main body, a connecting portion, and an extension portion. The connecting portion is connected to the main body and extends at least partially out of the pin slot and is electrically connected to an external conductive element. The extension portion is connected to the side of the main body away from the connecting portion and extends into the pin slot.

[0012] In one embodiment, guide teeth are provided on both sides of the extension along the width direction of the stator pin.

[0013] In one embodiment, the extension has a movable slot that extends along the length of the stator pin and is located at the middle of the width of the extension.

[0014] In one embodiment, a bending plate is elastically connected to the stator pin, and the bending plate is set at an angle to the stator pin. When the stator pin is installed in the pin slot, the bending plate is in interference contact with the wall of the pin slot.

[0015] In one embodiment, the stator assembly further includes a second frame, wherein the first frame and the second frame respectively abut against both sides of the stator core along the axial direction;

[0016] The outer periphery of the first frame and / or the second frame is provided with at least one first limiting rib, and the inner side of the stator core is provided with at least one positioning groove, and the first limiting rib and the positioning groove are engaged.

[0017] This utility model also provides an electronic water pump, including the stator assembly as described above. The electronic water pump further includes a pump housing, an isolation sleeve, and a rotor assembly. The stator assembly is installed inside the pump housing. The isolation sleeve is located inside the stator assembly and is snapped into the stator assembly. The rotor assembly is installed inside the isolation sleeve. The stator core has a plurality of abutment bosses on its outer periphery, and the abutment bosses abut against the inner wall of the pump housing.

[0018] In one embodiment, at least one of the abutting protrusions has a limiting groove, and a second limiting rib is provided on the inner wall of the pump housing, the second limiting rib being engaged with the limiting groove.

[0019] In one embodiment, the isolation sleeve includes at least a mounting portion and a cylindrical portion. The cylindrical portion includes an expanded diameter section and a reduced diameter section. The expanded diameter section is connected to the mounting portion, and the reduced diameter section is connected to the expanded diameter section. The expanded diameter section and the reduced diameter section are coaxially arranged, and the diameter of the expanded diameter section is larger than the diameter of the reduced diameter section. The expanded diameter section is snapped into the stator assembly.

[0020] In one embodiment, the stator assembly further includes a second frame connected to the stator core. The inner side of the second frame is provided with a plurality of flanges, which are circumferentially spaced around the axis of the second frame. Each flange is provided with a plurality of fastening ribs, which are engaged with the expanded diameter section.

[0021] Compared with the prior art, this utility model can ensure the stability of the contact between the grounding pin and the stator core by clamping at least part of the grounding pin between the first frame and the stator core. After the first frame and the stator core are connected, the magnetic saturation intensity of the stator core is improved. Attached Figure Description

[0022] Figure 1 is a cross-sectional view of one embodiment of the electronic water pump provided by this utility model;

[0023] Figure 2 is an exploded view of one embodiment of the stator assembly provided by this utility model;

[0024] Figure 3 is a structural schematic diagram of one embodiment of the stator assembly provided by this utility model;

[0025] Figure 4 is a side view of one embodiment of the stator assembly provided by this utility model;

[0026] Figure 5 is a structural schematic diagram of one embodiment of the grounding pin provided by this utility model;

[0027] Figure 6 is a partial structural cross-sectional view of one embodiment of the stator assembly provided by this utility model;

[0028] Figure 7 is a top view of one embodiment of the stator core provided by this utility model;

[0029] Figure 8 is a structural schematic diagram of one embodiment of the first skeleton provided by this utility model;

[0030] Figure 9 is a structural schematic diagram from another angle of one embodiment of the first skeleton provided by this utility model;

[0031] Figure 10 is a structural schematic diagram of one embodiment of the second skeleton provided by this utility model;

[0032] Figure 11 is a structural schematic diagram from another angle of one embodiment of the second skeleton provided by this utility model;

[0033] Figure 12 is a schematic diagram of one embodiment of the stator insert provided by this utility model;

[0034] Figure 13 is a structural schematic diagram of one embodiment of the pump casing provided by this utility model;

[0035] Figure 14 is a structural schematic diagram of one embodiment of the isolation sleeve provided by this utility model;

[0036] Figure 15 is a structural schematic diagram from another angle of one embodiment of the isolation sleeve provided by this utility model.

[0037] The symbols in the diagram represent the following meanings:

[0038] 100. Stator assembly; 10. Stator core; 11. Positioning groove; 12. Abutment boss; 121. Limiting groove; 20. First frame; 21. Frame body; 211. Fixing groove; 22. Grounding boss; 221. Fixing hole; 23. Pin boss; 231. Pin groove; 24. First limiting rib; 30. Second frame; 31. Flanged plate; 311. Fastening rib; 40. Grounding pin; 41. Part 1; 42, Part 2; 50, Stator pin; 51, Main body; 52, Connecting part; 53, Extension part; 531, Guide tooth; 532, Movable groove; 54, Bending plate; 200, Electric water pump; 60, Pump housing; 61, Second limiting rib; 70, Isolation sleeve; 71, Mounting part; 72, Cylindrical part; 721, Expanding section; 722, Reducing section; 80, Rotor assembly; 90, Control board. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0044] This utility model provides a stator assembly 100, which is provided with a grounding pin 40 for grounding. The grounding pin 40 is in contact with the surface of the stator core 10, eliminating the need to drill holes in the stator core 10 and avoiding the problem of drilling holes affecting the magnetic circuit of the stator core 10.

[0045] Please refer to Figures 1-3. The stator assembly 100 includes a stator core 10, a first frame 20, and a grounding pin 40. The first frame 20 is connected to the stator core 10. A fixing hole 221 is provided in the first frame 20. The grounding pin 40 is at least partially fixed in the fixing hole 221, and at least two ends of the grounding pin 40 along the axial direction of the stator core 10 respectively abut against the first frame 20 and the stator core 10. In this way, the first frame 20 is used to fix the grounding pin 40, and the grounding pin 40 passes through the fixing hole 221, which makes the connection strength between the first frame 20 and the grounding pin 40 high, and the grounding pin 40 is more firmly limited, preventing the grounding pin 40 from shaking and shifting and the connection with the stator core 10 from being too loose.

[0046] Furthermore, the grounding pin 40 includes a first part 41 and a second part 42, which are connected and angled together. The first part 41 passes through the fixing hole 221 and is electrically connected to an external conductive element. The second part 42 is in surface contact with the axial end face of the stator core 10. Thus, the grounding pin 40 is in surface contact with the stator core 10, eliminating the need for additional holes on the stator core 10 to connect to the grounding pin 40. This results in a higher magnetic saturation intensity for the stator core 10, leading to more stable performance of the stator assembly 100.

[0047] Further, referring to Figures 4-6 and 8, the fixing hole 221 extends axially along the first frame 20. The first frame 20 also has a fixing groove 211 extending radially, which communicates with the fixing hole 221. The second part 42 is located in the fixing groove 211 and is perpendicular to the first part 41. The side of the second part 42 away from the first part 41 abuts against the stator core 10. Thus, the vertically arranged first part 41 and second part 42 can cooperate to form an L-shaped grounding pin 40. The first part 41 is arranged along the extension direction of the fixing hole 221, that is, the extension direction of the first part 41 is the axial direction of the first frame 20. One end of the first part 41 is exposed on one side of the first frame 20 in the axial direction and is electrically connected to an external conductive element. The other end is connected to the second part 42. The second part 42 extends radially along the first frame 20, thereby completely fitting against the end face of the stator core 10.

[0048] Understandably, in other embodiments, the angle between the second part 42 and the first part 41 can also be greater than 90°, that is, the second part 42 and the first part 41 are set at an obtuse angle. Since the position of the first part 41 is limited by the fixing hole 221, it is always kept in the axial direction of the first frame 20. Therefore, after the second part 42 is at an obtuse angle with it, it will be in interference contact with the axial end face of the stator core 10. The second part 42 always has an elastic force that fits against the stator core 10, making the electrical connection between the grounding pin 40 and the stator core 10 more stable.

[0049] Specifically, the first frame 20 includes a frame body 21 and a grounding boss 22. The grounding boss 22 is connected to the frame body 21 and extends along the axial direction of the first frame 20. A fixing hole 221 is formed in the grounding boss 22 and extends through both ends of the grounding boss 22 along its length. A fixing groove 211 is formed in the frame body 21. The side of the frame body 21 away from the grounding boss 22 abuts against the stator core 10. It should be explained that the length direction of the grounding boss 22 is parallel to the axial direction of the first frame 20. The grounding boss 22 increases the axial thickness of the first frame 20, while the thickness of the frame body 21 does not need to be increased. This extends the length of the fixing hole 221, ensuring the limiting of the grounding pin 40, while reducing space occupation and material costs.

[0050] The stator assembly 100 also includes a stator pin 50. A pin slot 231 is provided on the side of the first frame 20 where the first part 41 extends. That is, along the axial direction of the first frame 20, the stator pin 50 and the first part 41 are located on the same side of the axial direction of the first frame 20. The stator pin 50 is engaged in the pin slot 231 and partially extends out of the pin slot 231. The portion of the stator assembly 100 extending out of the pin slot 231 is electrically connected to an external conductive element. In this way, the first frame 20 can both limit the grounding pin 40 and fix the stator pin 50, resulting in a higher degree of structural integration and a more streamlined structure without affecting the visual appeal of the technology. Furthermore, the fact that the stator pin 50 and the grounding pin 40 are located on the same side of the first frame 20 makes the connection between the various structures more stable.

[0051] In this embodiment, when the stator assembly 100 is applied in the electronic water pump 200, the external conductive element is set as the control board 90. The connection between the stator assembly 100 and the control board 90 can reduce electromagnetic interference and electrostatic interference, and improve the EMC characteristics of the water pump.

[0052] For example, in this embodiment, both the stator pin 50 and the ground pin 40 are made of copper to take advantage of the good conductivity of copper.

[0053] Preferably, the first frame 20 is also provided with a plurality of pin protrusions 23, and the aforementioned pin slots 231 are formed on the pin protrusions 23. The pin protrusions 23 also extend along the axial direction of the first frame 20, and their technical effect is similar to that of the grounding protrusions 22 mentioned above, which will not be described again here.

[0054] Furthermore, multiple pin protrusions 23 are provided and are arranged circumferentially around the outer edge of the first frame 20. Each pin protrusion 23 has a pin slot 231, and a stator pin 50 is installed in each pin slot 231, thereby forming multiple electrical connection lines with the control board 90.

[0055] Preferably, in this embodiment, both the grounding pin 40 and the stator pin 50 are electrically connected to the control board 90 by soldering.

[0056] Further, referring to Figure 12, the stator pin 50 includes a main body 51, a connecting part 52, and an extension part 53. The connecting part 52 is connected to the main body 51 and extends at least partially out of the pin slot 231, and is electrically connected to an external conductive element. The extension part 53 is connected to the side of the main body 51 away from the connecting part 52 and extends into the pin slot 231. Thus, the main body 51, as the main structure of the stator pin 50, serves to connect multiple parts, the connecting part 52 is used to achieve electrical connection with the aforementioned control board 90, and the extension part 53 guides the stator pin 50 into the pin slot 231.

[0057] Preferably, guide teeth 531 are provided on both sides of the extension 53 along the width direction of the stator pin 50. In this way, the guide teeth 531 can guide the assembly direction of the stator pin 50 during the press-fitting process and improve the connection strength between the stator pin 50 and the first frame 20.

[0058] Optionally, the extension 53 has a movable groove 532, which extends along the length of the stator pin 50 and is located in the middle of the width of the extension 53. Thus, the extension 53 has two spaced-apart portions, with the movable groove 532 between them. Because of the movable groove 532, the structural strength of the two spaced-apart portions is reduced, and the connection between them and the main body 51 is more prone to deformation, thus facilitating their entry into the pin slot 231.

[0059] For example, the two spaced portions of the extension 53 expand outward along the width direction. When it is assembled into the pin slot 231, it needs to be deformed inward for installation. After installation, the guide tooth 531 can make interference contact with the slot wall of the pin slot 231, thereby making the installation of the stator pin 50 more stable.

[0060] A bent plate 54 is elastically connected to the stator pin 50. The bent plate 54 is set at an angle to the stator pin 50. When the stator pin 50 is installed in the pin slot 231, the bent plate 54 and the slot wall of the pin slot 231 are in interference fit. The interference fit between the bent plate 54 and the pin slot 231 further enhances the connection strength between the stator pin 50 and the first frame 20.

[0061] Specifically, the bending plate 54 is disposed in the aforementioned movable groove 532, connecting the extension 53 and the main body 51, and located in the middle of the entire stator pin 50, thereby making the force on the stator pin 50 more balanced.

[0062] The stator assembly 100 also includes a second frame 30. The first frame 20 and the second frame 30 abut against the two sides of the stator core 10 along the axial direction, respectively. Referring to Figure 9, the outer periphery of the first frame 20 and / or the second frame 30 is provided with at least one first limiting rib 24, and the inner side of the stator core 10 is provided with at least one positioning groove 11. The first limiting rib 24 and the positioning groove 11 are engaged. In this way, after the first limiting rib 24 is engaged with the positioning groove 11, the relative position of the first frame 20 and the second frame 30 with the stator core 10 can be made more stable, and rotation and slippage are less likely to occur.

[0063] Preferably, in this embodiment, the second frame 30 has a similar structure to the first frame 20, except that the first frame 20 is not equipped with a grounding pin 40 and a stator pin 50 for connection to the control board 90. The first frame 20 and the second frame 30 are used for limiting the stator core 10, and their cooperation structure with the stator core 10 is prior art, which will not be described in detail here.

[0064] This utility model also provides an electronic water pump 200, including the stator assembly 100 as described above. The electronic water pump 200 also includes a pump housing 60, an isolation sleeve 70, and a rotor assembly 80. The stator assembly 100 is installed inside the pump housing 60, the isolation sleeve 70 is located inside the stator assembly 100 and is snapped into the stator assembly 100, and the rotor assembly 80 is installed inside the isolation sleeve 70.

[0065] Referring to Figure 7, the stator core 10 has multiple abutment bosses 12 on its outer periphery, which abut against the inner wall of the pump housing 60. Thus, the pump housing 60 protects the internal components. The isolation sleeve 70 is installed between the stator assembly 100 and the rotor assembly 80 to prevent the rotor assembly 80 from affecting the stator assembly 100 during rotation. The rotor assembly 80 responds to the drive of the stator assembly 100, outputting power outwards. The stator core 10 achieves self-limitation with the help of the pump housing 60. The multiple abutment bosses 12 provide support force to the pump housing 60 from multiple directions, and the reverse limiting effect on the stator core 10 stabilizes its position.

[0066] Furthermore, referring to Figure 13, at least one abutment boss 12 has a limiting groove 121, and a second limiting rib 61 protrudes from the inner wall of the pump housing 60, the second limiting rib 61 being engaged with the limiting groove 121. This further improves the connection strength between the pump housing 60 and the stator assembly 100.

[0067] Please refer to Figures 14-15. The isolation sleeve 70 includes at least a mounting portion 71 and a cylindrical portion 72. The cylindrical portion 72 includes an expanded diameter section 721 and a reduced diameter section 722. The expanded diameter section 721 is connected to the mounting portion 71, and the reduced diameter section 722 is connected to the expanded diameter section 721. The expanded diameter section 721 and the reduced diameter section 722 are coaxially arranged, and the diameter of the expanded diameter section 721 is larger than the diameter of the reduced diameter section 722. The expanded diameter section 721 is snapped into the stator assembly 100. Thus, because the expanded diameter section 721 has a larger outer diameter, it is used to snap into the stator assembly 100, specifically, it snaps into the second frame 30 in the stator assembly 100. The reduced diameter section 722 has a smaller outer diameter and does not interfere with either the first frame 20 or the second frame 30, thus ensuring its isolation function.

[0068] Please refer to Figures 10-11. To improve the connection strength between the stator assembly 100 and the isolation sleeve 70, the inner side of the second frame 30 is constructed with multiple flanges 31. These flanges 31 are circumferentially spaced around the axis of the second frame 30. Each flange 31 has multiple protruding fastening ribs 311, which engage with the expanded diameter section 721. Thus, the flanges 31 increase the friction with the isolation sleeve 70 through the fastening ribs 311. The multiple flanges 31 provide abutment and restraint to the expanded diameter section 721 in multiple circumferential directions, thereby improving the balance of force transmission between the second frame 30 and the isolation sleeve 70.

[0069] Compared to existing technologies, this invention, by setting a grounding pin 40 that contacts the surface of the stator core 10, eliminates the need for opening holes in the stator core 10 for grounding, thereby improving the magnetic saturation intensity of the stator core 10. Simultaneously, the grounding pin 40 and stator pin 50 are located on one side of the first frame 20, resulting in a more compact structure and optimized connections between various components. This leads to more stable operation of the entire electronic water pump 200 and achieves lightweight and miniaturization.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A stator assembly, characterized in that, include: Stator core (10); first frame (20) connected to the stator core (10), the first frame (20) having a fixing hole (221); grounding pin (40), at least part of the grounding pin (40) being fixed in the fixing hole (221), and the two ends of the grounding pin (40) along the axial direction of the stator core (10) respectively abutting against the first frame (20) and the stator core (10).

2. The stator assembly according to claim 1, characterized in that, The grounding pin (40) includes a first part (41) and a second part (42). The first part (41) and the second part (42) are connected and are angled. The first part (41) passes through the fixing hole (221) and is electrically connected to an external conductive element. The second part (42) is in surface contact with the axial end face of the stator core (10).

3. The stator assembly according to claim 2, characterized in that, The fixing hole (221) extends along the axial direction of the first frame (20). The first frame (20) is also provided with a fixing groove (211) extending radially. The fixing groove (211) communicates with the fixing hole (221). The second part (42) is located in the fixing groove (211) and is perpendicular to the first part (41). The side of the second part (42) away from the first part (41) abuts against the stator core (10).

4. The stator assembly according to claim 3, characterized in that, The first frame (20) includes a frame body (21) and a grounding boss (22). The grounding boss (22) is connected to the frame body (21) and extends along the axial direction of the first frame (20). The fixing hole (221) is opened on the grounding boss (22) and passes through both ends of the grounding boss (22) in the length direction. The fixing groove (211) is opened on the frame body (21). The side of the frame body (21) away from the grounding boss (22) abuts against the stator core (10).

5. The stator assembly according to claim 2, characterized in that, The stator assembly also includes a stator pin (50). A pin slot (231) is provided on one side of the first frame (20). The stator pin (50) is engaged in the pin slot (231) and partially extends out of the pin slot (231). The portion of the stator pin (50) extending out of the pin slot (231) is electrically connected to an external conductive element. The stator pin (50) and the first part (41) are located on the same side of the axial direction of the first frame (20).

6. The stator assembly according to claim 5, characterized in that, The stator pin (50) includes a main body (51), a connecting part (52) and an extension part (53). The connecting part (52) is connected to the main body (51) and extends at least partially out of the pin slot (231) and is electrically connected to an external conductive element. The extension part (53) is connected to the side of the main body (51) away from the connecting part (52) and extends into the pin slot (231).

7. The stator assembly according to claim 6, characterized in that, Guide teeth (531) are provided on both sides of the extension (53) along the width direction of the stator pin (50).

8. The stator assembly according to claim 6 or 7, characterized in that, The extension (53) has a movable groove (532) that extends along the length of the stator pin (50) and is located in the middle of the width of the extension (53).

9. The stator assembly according to claim 5, characterized in that, A bending plate (54) is elastically connected to the stator pin (50). The bending plate (54) is set at an angle to the stator pin (50). When the stator pin (50) is installed in the pin slot (231), the bending plate (54) and the slot wall of the pin slot (231) are in interference fit.

10. The stator assembly according to claim 1, characterized in that, The stator assembly further includes a second frame (30), the first frame (20) and the second frame (30) respectively abut against the two sides of the stator core (10) axially; the outer periphery of the first frame (20) and / or the second frame (30) is provided with at least one first limiting rib (24), and the inner side of the stator core (10) is provided with at least one positioning groove (11), the first limiting rib (24) and the positioning groove (11) are engaged.

11. An electronic water pump, characterized in that, The electronic water pump includes a stator assembly as described in any one of claims 1-10, and further includes a pump housing (60), an isolation sleeve (70), and a rotor assembly (80). The stator assembly is installed inside the pump housing (60), the isolation sleeve (70) is located inside the stator assembly and is engaged with the stator assembly, and the rotor assembly (80) is installed inside the isolation sleeve (70). The stator core (10) has a plurality of abutment bosses (12) on its outer periphery, and the abutment bosses (12) abut against the inner wall of the pump housing (60).

12. The electronic water pump according to claim 11, characterized in that, At least one of the abutting bosses (12) has a limiting groove (121) and a second limiting rib (61) is provided on the inner wall of the pump housing (60). The second limiting rib (61) is engaged with the limiting groove (121).

13. The electronic water pump according to claim 11, characterized in that, The isolation sleeve (70) includes at least a mounting portion (71) and a cylindrical portion (72). The cylindrical portion (72) includes an expanded diameter section (721) and a reduced diameter section (722). The expanded diameter section (721) is connected to the mounting portion (71), and the reduced diameter section (722) is connected to the expanded diameter section (721). The expanded diameter section (721) and the reduced diameter section (722) are coaxially arranged, and the diameter of the expanded diameter section (721) is larger than the diameter of the reduced diameter section (722). The expanded diameter section (721) is engaged with the stator assembly.

14. The electronic water pump according to claim 13, characterized in that, The stator assembly also includes a second frame (30), which is connected to the stator core (10). The inner side of the second frame (30) is provided with a plurality of flanges (31). The plurality of flanges (31) are arranged circumferentially around the axis of the second frame (30). Each flange (31) is provided with a plurality of fastening ribs (311), which are engaged with the expanded diameter section (721).

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