Stator assembly and electronic water pump

Abstract

The utility model relates to a stator assembly and an electronic water pump. The stator assembly includes a stator core and at least one positioning portion. The at least one positioning portion is fixed to the stator core. One side of the positioning part in the axial direction is provided with an axial positioning surface, and two opposite sides of the positioning part in the circumferential direction are provided with circumferential positioning surfaces. The axial positioning surface is configured to cooperate with an injection mold to position the stator assembly in the injection mold along the axial direction. The circumferential positioning surface is configured to cooperate with an injection mold to position the stator assembly in the injection mold in the circumferential direction. By means of the at least one positioning part with the axial positioning surface and the circumferential positioning surface, the stator assembly can be conveniently and accurately positioned in multiple directions in an injection mold in the injection molding process with the stator assembly as an insert.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic water pumps, and in particular, to a stator assembly of an electronic water pump and an electronic water pump having the same. Background Art

[0002] Electronic water pumps have many advantages, such as low power consumption, high efficiency, and accurate flow control. Electronic water pumps can be used in automobiles, especially new energy vehicles. For example, electronic water pumps can be used in automotive thermal management systems to drive cooling fluid media to flow in pipelines.

[0003] Reducing the number of parts helps to reduce the difficulty of assembling the electronic water pump, and thus helps to reduce the manufacturing cost of the electronic water pump. To achieve this goal, one or several parts can be injection molded as an insert into a whole. However, during the injection molding process, it is difficult to conveniently and accurately position the insert in the injection mold in multiple directions. Utility Model Content

[0004] In view of this, the present disclosure provides a stator assembly of an electronic water pump and an electronic water pump having the same, aiming to help the stator assembly be positioned in multiple directions in an injection mold more conveniently and accurately during an injection molding process using the stator assembly as an insert.

[0005] The stator assembly provided by the present disclosure includes a stator core and at least one positioning portion. The at least one positioning portion is fixed to the stator core. The positioning portion is provided with an axial positioning surface on one side in the axial direction, and circumferential positioning surfaces on two opposite sides in the circumferential direction. The axial positioning surface is configured to cooperate with the injection mold to position the stator assembly in the axial direction in the injection mold. The circumferential positioning surface is configured to cooperate with the injection mold to position the stator assembly in the circumferential direction in the injection mold.

[0006] The inner side surface of the inner cavity of the injection mold is provided with at least one positioning groove, at least one positioning groove corresponds to at least one positioning part, and each positioning groove is provided with an axial end face and two circumferential side faces. In the process of placing the stator assembly into the injection mold, the two circumferential side faces of each positioning groove respectively conflict with the two circumferential positioning surfaces of the corresponding positioning part to ensure that the stator assembly is accurately positioned relative to the injection mold in the circumferential direction. After the stator assembly reaches the target position in the axial direction, the axial end face of the positioning groove conflicts with the axial positioning surface of the positioning part to ensure that the stator assembly is accurately positioned relative to the injection mold in the axial direction. It can be seen that with the help of at least one positioning part having an axial positioning surface and a circumferential positioning surface, in the injection molding process with the stator assembly as an insert, the stator assembly can be positioned in multiple directions in the injection mold more conveniently and accurately.

[0007] In a possible implementation, the stator assembly includes a fixing seat, the stator core is fixed to the fixing seat, the fixing seat includes a main body and at least one positioning portion, and the at least one positioning portion protrudes radially outward from an outer circumferential surface of the main body.

[0008] In this implementation, at least one positioning portion is a part of the fixing seat, and the fixing of the fixing seat to the stator core is relatively easy to achieve, and the combination is relatively reliable. In addition, the fixing seat can also play other roles, for example, the fixing seat can help fix multiple stator laminations of the stator core, and can also provide a winding portion for winding the stator winding.

[0009] In a possible implementation, the stator assembly further includes a stator winding, a pin electrically connected to the stator winding, and a pin positioning member for fixing the pin, wherein the pin positioning member is fixed to the main body and is radially located outside the stator winding.

[0010] The pin electrically connected to the stator winding is fixed to the pin positioning member, and the pin positioning member is fixed to the main body of the fixing seat. In this way, after injection molding with the stator assembly as an insert, the resulting pump body will form a connector of the electronic water pump. In this way, when assembling the pump body with other parts, there is no need to assemble the connector separately, which helps to reduce the number of parts of the electronic water pump. In addition, since the pin positioning member is located radially outside the stator winding, the connector formed after injection molding is radially further outward.

[0011] In one possible implementation, the stator assembly also includes a card plate, a stator winding, a pin electrically connected to the stator winding, and a pin positioning member for fixing the pin. The card plate is radially located on the inner side of the stator winding and fixed to a fixing seat, and the pin positioning member is fixed to the card plate.

[0012] The pin electrically connected to the stator winding is fixed to the pin positioning member, the pin positioning member is fixed to the card plate, and the card plate is fixed to the seat. In this way, after injection molding with the stator assembly as an insert, the resulting pump body will form a joint of the electronic water pump. In this way, when assembling the pump body with other parts, there is no need to assemble the joint separately, which helps to reduce the number of parts of the electronic water pump. In addition, because the card plate is located on the inner side of the stator winding in the radial direction, the joint formed after injection molding is closer to the middle of the radial direction.

[0013] In one possible implementation, the pin positioning member is provided with a positioning groove open to one axial side, the groove wall of the positioning groove is provided with a first wire passing notch which is roughly V-shaped, the pin is partially seated in the positioning groove, and the wire connecting the winding and the pin extends into the positioning groove through the first wire passing notch.

[0014] By inserting the pin into the positioning groove, the pin can be reliably positioned and fixed. The wire connecting the winding and the pin extends into the positioning groove through the first wire-passing notch to connect with the pin. In addition, the first wire-passing notch cooperates with the wire to effectively fix the position of the wire, prevent it from loosening or dislocation during use, and improve the reliability of the connection.

[0015] In a possible implementation, the stator assembly further includes a lead member. The lead member is fixed to the main body, radially located outside the winding, provided with a plurality of second wire-passing notches spaced apart in the circumferential direction, and provided with a wire routing groove located radially outside. The wire connecting the stator winding and the pin passes through the second wire-passing notches and partially extends in the wire routing groove.

[0016] The wire connected to the winding can extend from the inside of the lead piece to the outside through the second wire-passing notch, and then extend circumferentially in the wiring groove to the plug pin to be connected with the plug pin. In this way, the arrangement of the wires will be more orderly.

[0017] In a possible implementation manner, the at least one positioning portion includes a plurality of positioning portions, and the plurality of positioning portions are distributed at intervals along the circumferential direction.

[0018] By means of a plurality of positioning portions spaced apart along the circumferential direction, the stator assembly can be positioned more reliably and accurately. The electronic water pump provided by the present disclosure includes a pump body and a rotor assembly. The pump body is formed by injection molding with the above-mentioned stator assembly as an insert, so that the pump body covers the stator assembly and forms a rotor cavity. The rotor assembly is rotatably arranged in the rotor cavity relative to the pump body. During assembly, the main content of the assembly work of the electronic water pump can be completed by only placing the rotor assembly in the rotor cavity of the pump body. In this way, it is helpful to reduce the number of parts of the electronic water pump, simplify the assembly process, thereby improving assembly efficiency and reducing manufacturing costs.

[0019] In one possible implementation, the pump body includes a first covering portion and a second covering portion distributed along the axial direction, the first covering portion and the second covering portion are connected at at least one positioning portion of the stator assembly, the outer diameter of the first covering portion is greater than the outer diameter of the second covering portion, and the outer diameter of the first covering portion is approximately equal to the outer diameter of at least one positioning portion.

[0020] According to this structure of the pump body, when the injection mold is moved relative to the pump body along the direction from the first covering part to the second covering part to open the mold, the part of the injection mold inner cavity side corresponding to the first covering part will be able to pass over at least one positioning part, so that the injection mold can be smoothly separated from the pump body, reducing the difficulty of demolding.

[0021] In a possible implementation, the pump body further includes a flange and a joint, wherein the flange protrudes radially outward from the outer circumferential surface of the first covering portion, and the joint is arranged on a side of the second covering portion axially away from the first covering portion.

[0022] According to this structure of the pump body, when the injection mold is moved relative to the pump body along the direction from the first covering portion to the second covering portion to open the mold, the flange and the joint will not prevent the pump body from being separated from the mold, thereby facilitating demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments are briefly introduced below.

[0024] It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be considered to limit the scope. It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements.

[0025] It should also be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate. Figure 1 is a schematic diagram of an exploded view of an electronic water pump according to an embodiment of the present disclosure.

[0026] Figure 2 yes Figure 1 Schematic diagram of the structure of the stator assembly of the electronic water pump.

[0027] Figure 3 yes Figure 2 Schematic diagram of the structure of the positioning part of the stator assembly.

[0028] Figure 4 yes Figure 2 Exploded diagram of the stator assembly in FIG.

[0029] Figure 5 yes Figure 2 Schematic diagram of the structure of the pins and pin locating parts of the stator assembly.

[0030] Figure 6 yes Figure 1 Schematic diagram of the structure of the pump body of the electronic water pump.

[0031] Figure 7 yes Figure 6 Schematic cross-sectional view of the pump body in FIG.

[0032] Figure 8 It is a schematic structural diagram of a stator assembly according to a variation of the present disclosure.

[0033] Fig. 9 yes Figure 8 Schematic diagram of the structure of the card plate and pin positioning parts of the stator assembly.

[0034] Fig.10 It is a schematic diagram of the structure of a pump body according to a modified example of the present disclosure.

[0035] Fig.11yes Fig.10 Schematic cross-sectional view of the pump body in FIG.

[0036] Fig.12 It is a structural schematic diagram of an injection mold according to an embodiment of the present disclosure.

[0037] Fig.13 yes Fig.12 Schematic diagram of the structure of the positioning groove of the injection mold.

[0038] Fig.14 yes Fig.12 The injection mold in FIG. 1 is provided with a structural schematic diagram of a stator assembly. DETAILED DESCRIPTION

[0039] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described here. The embodiments described here are only for a more thorough and clear understanding of the present disclosure.

[0040] Exemplary Electronic Water Pump

[0041] The present disclosure provides an electronic water pump 100. For example, the electronic water pump 100 can be applied to automobiles, especially new energy vehicles. In particular, the electronic water pump 100 can be applied to automobile thermal management systems. More particularly, the electronic water pump 100 can be used to drive a cooling fluid medium to flow in a pipeline of a thermal management system. It should be understood that the application scenarios mentioned here are exemplary, and the application scenarios of the electronic water pump 100 are not necessarily limited thereto.

[0042] For ease of understanding, the following is an example of the structure of the electronic water pump 100. It should be understood that the structure of the electronic water pump 100 should not be limited to the following description. For example, one or more of the elements cited below can be omitted or replaced, and the layout relationship between them can be replaced.

[0043] refer to Figure 1 The electronic water pump 100 may include a pump body 10, a pump cover 20 and a rotor assembly 30. A rotor cavity 11 may be formed in the pump body 10, and a pump shaft 12 may be disposed in the rotor cavity 11. Figure 7 The pump cover 20 can be assembled with the pump body 10 to close the rotor cavity 11. The rotor assembly 30 can be accommodated in the rotor cavity 11 and supported by the pump shaft 12 so that the rotor assembly 30 can rotate around the pump shaft 12 relative to the pump body 10.

[0044] The pump body 10 may include a stator assembly 13. Figure 2The pump body 10 can be formed by injection molding with the stator assembly 13 as an insert, so that the pump body 10 covers the stator assembly 13 and forms the rotor cavity 11. Accordingly, during assembly, the main content of the assembly work of the electronic water pump 100 can be completed by only placing the rotor assembly 30 in the rotor cavity 11 of the pump body 10, which helps to reduce the number of parts of the electronic water pump 100, simplify the assembly process, thereby improving assembly efficiency and reducing manufacturing costs.

[0045] The working principle of the electronic water pump 100 may not be significantly different from that of a conventional electronic water pump, so here only a brief example is given of the working principle of the electronic water pump 100. When the electronic water pump 100 is running, the stator winding 131 of the stator assembly 13 with current flowing therethrough generates a rotating magnetic field, which acts on the rotor part 31 of the rotor assembly 30 to form a magneto-electrical rotation torque, and the rotor part 31 rotates with the impeller part 32 under the action of the torque, thereby driving the fluid medium to flow.

[0046] Exemplary stator assembly

[0047] refer to Figure 2 and Figure 3 In addition to the aforementioned stator winding 131, the stator assembly 13 may also include a stator core 132. The stator core 132 may also be referred to as a stator iron core, but this does not mean that the stator core 132 is necessarily made of an iron material. For example, the stator core 132 may be composed of a plurality of stator laminations stacked in the axial direction.

[0048] The stator assembly 13 may further include a positioning portion 133, and the positioning portion 133 is fixed to the stator core 132. Figure 2 and Figure 3 The positioning portion 133 may have an axial positioning surface 1331 and two circumferential positioning surfaces 1332 , wherein the axial positioning surface 1331 is located on one side of the positioning portion 133 in the axial direction, and the two circumferential positioning surfaces 1332 are located on two opposite sides of the positioning portion 133 in the circumferential direction.

[0049] In the process of injecting the stator assembly 13 as an insert to obtain the pump body 10, it is necessary to accurately position the stator assembly 13 in multiple directions in the injection mold 200. For this purpose, refer to Fig.12 The injection mold 200 has an inner cavity 210 suitable for accommodating at least part of the stator assembly 13, and a positioning groove 220 is provided on the inner side of the inner cavity 210. Fig.13 The positioning groove 220 may be provided with an axial end face 221 and two circumferential side faces 222 .

[0050] Combination Figure 2 , Figure 3 as well as Figure 12 to Figure 14When the stator assembly 13 is placed in the inner cavity 210 of the injection mold 200, the two circumferential side surfaces 222 of the positioning groove 220 respectively contact the two circumferential positioning surfaces 1332 of the positioning portion 133 to ensure that the stator assembly 13 is accurately positioned relative to the injection mold 200 in the circumferential direction. After the stator assembly 13 reaches the target position in the axial direction, the axial end surface 221 of the positioning groove 220 contacts the axial positioning surface 1331 of the positioning portion 133 to ensure that the stator assembly 13 is accurately positioned relative to the injection mold 200 in the axial direction.

[0051] It can be seen that, with the help of the positioning portion 133 having the axial positioning surface 1331 and the circumferential positioning surface 1332 , during the injection molding process with the stator assembly 13 as an insert, the stator assembly 13 can be positioned in multiple directions in the injection mold 200 more conveniently and accurately.

[0052] The stator assembly 13 may include a plurality of positioning portions 133, and the plurality of positioning portions 133 may be distributed at intervals along the circumferential direction. Correspondingly, the inner side surface of the inner cavity 210 of the injection mold 200 may be provided with a plurality of positioning grooves 220, and the plurality of positioning grooves 220 may be distributed at intervals along the circumferential direction. The plurality of positioning portions 133 correspond to the plurality of positioning grooves 220, respectively, so that when the stator assembly 13 is placed in the inner cavity 210 of the injection mold 200, each positioning portion 133 is guided by a corresponding positioning groove 220. By means of the plurality of positioning portions 133 distributed at intervals along the circumferential direction, the stator assembly 13 can be positioned more reliably and accurately.

[0053] It can be understood that, although, in the current example of the present disclosure, the stator assembly 13 includes a plurality of positioning portions 133 and the injection mold 200 is provided with a plurality of positioning grooves 220, in other examples of the present disclosure, the stator assembly 13 may also include only one positioning portion 133, and correspondingly, the injection mold 200 may only have one positioning groove 220.

[0054] There are many ways to fix the positioning portion 133 to the stator core 132, and this disclosure does not impose any specific restrictions on this. As an implementation method, Figure 4 As shown, the stator assembly 13 may include a fixing seat 130, and the stator core 132 is fixed to the fixing seat 130. For example, the fixing seat 130 may be formed by integral injection molding with the stator core 132 as an insert, and the positioning portion 133 may be a part of the fixing seat 130. Specifically, the fixing seat 130 may include a main body 134 and a positioning portion 133, and the positioning portion 133 may protrude radially outward from the outer circumferential surface of the main body 134.

[0055] In this implementation, the positioning portion 133 is a part of the fixing seat 130, and the fixing of the fixing seat 130 and the stator core 132 is relatively easy to achieve, and the combination is relatively reliable. In addition, the fixing seat 130 can also play other roles, for example, the fixing seat can help fix the multiple stator laminations of the stator core 132, and can also provide a winding portion 135 for winding the stator winding 131.

[0056] To energize the stator winding 131, refer to Figure 2 and Figure 4 The stator assembly 13 may further include a pin 136 and a pin positioning member 137 for fixing the pin 136. The pin 136 is electrically connected to the stator winding 131, for example, through a wire 1311. The pin positioning member 137 is fixed to the main body 134 and is radially located outside the stator winding 131. In order to simplify the manufacturing process, in one example, the pin positioning member 137 may be a part of the fixing seat 130. Of course, in other examples, the pin positioning member 137 may also be an independent component installed on the fixing seat 130.

[0057] The pin 136 electrically connected to the stator winding 131 is fixed to the pin positioning member 137, and the pin positioning member 137 is fixed to the main body 134. In this way, after injection molding with the stator assembly 130 as an insert, the resulting pump body 10 will be formed with the connector 14 of the electronic water pump 100. In this way, when assembling the pump body 10 with other parts, there is no need to assemble the connector 14 separately, which helps to reduce the number of parts of the electronic water pump 100. In addition, since the pin positioning member 137 is located radially outside the stator winding 131, the connector 14 formed after injection molding is radially further outward.

[0058] The present disclosure does not impose any particular limitation on the structure of the pin positioning member 137, as long as it can relatively reliably fix the pin 136. Here is a possible implementation of the pin positioning member 137. Figure 4 and 5 The pin positioning member 137 may be provided with a positioning groove 1371 open toward one axial side, and the groove wall of the positioning groove 1371 is provided with a first wire passing notch 1372 which is substantially V-shaped. The pin 136 may be partially seated in the positioning groove 1371, and the wire 1311 connecting the stator winding 131 and the pin 136 may extend into the positioning groove 1371 through the first wire passing notch 1372.

[0059] By inserting the plug pin 136 into the positioning groove 1371, the plug pin 136 can be reliably positioned and fixed. The wire 1311 connecting the winding 131 and the plug pin 136 extends into the positioning groove 1371 through the first wire-passing notch 1372 to be connected with the plug pin 136. In addition, through the cooperation between the first wire-passing notch 1372 and the wire 1311, the position of the wire 1311 can be effectively fixed, preventing the wire 1311 from loosening or misalignment during use, thereby improving the reliability of the connection between the wire 1311 and the plug pin 136.

[0060] In order to avoid the messy arrangement of the wires 1311, refer to Figure 2 , the stator assembly 130 may further include a lead piece 138, and the lead piece 138 is fixed to the fixing seat 134. In order to simplify the manufacturing process, in one example, the lead piece 138 may be a part of the fixing seat 130. Of course, in other examples of the present disclosure, the lead piece 138 may also be an independent component installed on the fixing seat 130. The lead piece 138 may be located radially outside the stator winding 131, may be provided with a plurality of second wire-passing notches 1381 spaced apart in the circumferential direction, and may be provided with a wiring groove 1382 located radially outside. The wire 1311 connecting the stator winding 131 and the pin 136 passes through the second wire-passing notch 1381 and partially extends in the wiring groove 1382.

[0061] The wire 1311 connected to the stator winding 131 can extend from the inside of the lead member 138 to the outside of the lead member 138 through the second wire notch 1382, and then extend circumferentially in the wiring groove 1382 to the plug pin 136 to connect with the plug pin 136. In this way, the arrangement of the wire 1311 will be more orderly.

[0062] Exemplary Pump Body

[0063] refer to Figure 6 and Figure 7 As described above, the pump body 10 is formed by injection molding with the stator assembly 13 as an insert, and the pump body 10 covers the stator assembly 13 and forms a rotor cavity 11. The rotor assembly 30 is placed in the rotor cavity 11 and supported by the pump shaft 12 so as to be rotatable relative to the pump body 10. In one example, the pump body 10 can be formed by injection molding with both the stator assembly 13 and the pump shaft 12 as inserts to further reduce the number of components and simplify the assembly process.

[0064] Further, refer to Figure 6The pump body 10 may include a first covering portion 15 and a second covering portion 16 distributed along the axial direction, and the first covering portion 15 and the second covering portion 16 are connected at the positioning portion 133 of the stator assembly 13. The outer diameter of the first covering portion 15 is greater than the outer diameter of the second covering portion 16, and the outer diameter of the first covering portion 15 is substantially equal to the outer diameter of the positioning portion 133. Here, the outer diameter of the positioning portion 133 may refer to the diameter of the cylindrical surface defined by the outer peripheral surface of the positioning portion 133. According to this configuration of the pump body 10, when the injection mold 200 is moved relative to the pump body 10 in the direction from the first covering portion 15 to the second covering portion 16 to open the mold, the inner side surface of the inner cavity 210 of the injection mold 200 corresponding to the first covering portion 15 will be able to pass over the positioning portion 133, so that the injection mold 200 can be smoothly separated from the pump body 10 to reduce the difficulty of demolding.

[0065] Further, the pump body 10 may further include a flange 17 and a joint 14, wherein the flange 17 radially protrudes outward from the outer peripheral surface of the first covering portion 15, and the joint 14 is provided on a side of the second covering portion 16 axially away from the first covering portion 15. According to this configuration of the pump body 10, when the injection mold 200 is moved relative to the pump body 10 in a direction from the first covering portion 15 to the second covering portion 16 to open the mold, the flange 17 and the joint 14 will not prevent the pump body 10 from being separated from the injection mold 200, thereby facilitating demoulding.

[0066] Modification of stator assembly

[0067] The following is an example of a stator assembly 13a according to a modified example of the present disclosure. The stator assembly 13a in the modified example has many of the same elements as the stator assembly 13 in the aforementioned embodiment. For the purpose of simplicity, the same elements will be denoted by the same reference numerals to appropriately omit repeated descriptions.

[0068] contrast Figure 2 and Figure 8 It can be seen that an obvious difference between the stator assembly 13 and the stator assembly 13a is that the pins 136 of the stator assembly 13 are relatively outside in the radial direction, while the pins 136 of the stator assembly 13a are relatively inside in the radial direction. For example, the pins 136 of the stator assembly 13 are located outside the stator winding 131 in the radial direction, while the pins 136 of the stator assembly 13a are located inside the stator winding 131 in the radial direction.

[0069] Since the pin 136 of the stator assembly 13 is relatively outward in the radial direction, the connector 14 of the pump body 10 having the same is also relatively outward in the radial direction. Correspondingly, since the pin 136 of the stator assembly 13a is relatively inward in the radial direction, the connector 14 of the pump body 10a having the same is also relatively inward in the radial direction. In this way, two options can be provided for the position of the connector 14, which is helpful to adapt to various application scenarios.

[0070] In order to help the pin 136 obtain a relatively inner position in the radial direction, refer to Figure 8 and Fig. 9 , the stator assembly 13a may include a clamping plate 139. The clamping plate 139 is located radially inside the stator winding 131, the pin positioning member 137 is fixed to the clamping plate 139, and the clamping plate 139 is fixed to the fixing seat 130. As an example, the fixing seat 130 may include a supporting portion 1351 located inside the winding portion 135, and the clamping plate 139 may be fixed to the supporting portion 1351.

[0071] The pin 136 electrically connected to the stator winding 131 is fixed to the pin positioning member 137, the pin positioning member 137 is fixed to the clamping plate 139, and the clamping plate 139 fixes the seat 130. In this way, after injection molding with the stator assembly 13 as an insert, the resulting pump body 10 will be formed with the connector 14 of the electronic water pump 100. In this way, when assembling the pump body 10 with other parts, there is no need to assemble the connector 14 separately, which helps to reduce the number of parts of the electronic water pump 100. In addition, because the clamping plate 139 is located radially on the inner side of the stator winding 131, the connector 14 formed after injection molding is closer to the radial middle. Deformation of the pump body

[0072] The pump body 10a according to the modified example of the present disclosure is described below by way of example. The pump body 10a in the modified example has many of the same elements as the pump body 10 in the aforementioned embodiment. For the purpose of simplicity, the same elements will be labeled with the same reference numerals to appropriately omit repeated descriptions.

[0073] The main difference between the pump body 10a and the pump body 10 is that the pump body 10a includes a stator assembly 13a, while the pump body 10 includes a stator assembly 13. According to this difference, the joint 14 of the pump body 10a is relatively inward in the radial direction, while the joint 14 of the pump body 10 is relatively outward in the radial direction. In this way, two options can be provided for the position of the joint 14, which helps to adapt to a variety of application scenarios.

[0074] Example Injection Mold

[0075] The injection mold 200 has been generally introduced above, and a supplementary explanation is given here. The injection mold 200 is a component of an injection molding device, and the injection molding device may include multiple injection molds, and the injection mold 200 is one of them. For example, the injection molding device may include two or three injection molds. Multiple injection molds cooperate to form an injection cavity, and the inner cavity 210 of the injection mold 200 constitutes a part of the injection cavity.

[0076] During the injection molding process, the injection molding cavity can be opened, and inserts such as the stator assembly 13, 13a and the pump shaft 12 can be placed therein. Then, the injection molding cavity can be closed, and molten material can be injected therein. Then, after the molten material is cooled and solidified, the multiple injection molds can be relatively moved to open the injection molding cavity, and the injection-molded pump body 10 can be removed to achieve demolding.

[0077] Exemplary Manufacturing Methods

[0078] Next, the manufacturing method of the electronic water pump 100 is described. It should be understood that the following description is only illustrative, and other manufacturing methods can be used to manufacture the electronic water pump 100. First, the stator core 132 can be used as an insert for the first injection molding to obtain the stator core 132 and the fixing seat 130 fixed together.

[0079] Next, the enameled wire may be wound on the winding portion 135 of the fixing seat 130 to form the stator winding 131, the pins 136 may be installed in the pin positioning members 137, and the wires may be connected between the stator winding 131 and the pins 136 to obtain the stator assembly 13, 13a.

[0080] Next, the pump body 10 may be formed by injection molding using an injection molding device including the injection mold 200 with the stator assembly 13 , 13 a and the pump shaft 12 as inserts.

[0081] Finally, the pump body 10 , the pump cover 20 , the rotor assembly 30 and other components can be assembled together to complete the assembly of the electronic water pump 100 .

[0082] It should be noted that, in the present disclosure, the axial direction may refer to the extension direction of the rotation axis of the rotor assembly 30, that is, the extension direction of the pump shaft 12. The radial direction may refer to the direction on the radial plane orthogonal to the axial direction and intersecting with the rotation axis, and the circumferential direction may refer to the circumferential direction around the rotation axis.

[0083] It should be understood that the term "including" and its variations used in the present disclosure are open inclusions, i.e., "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0084] It should be understood that although the terms "first" or "second" etc. may be used in the present disclosure to describe various elements (such as a first through-line gap and a second through-line gap), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0085] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Any changes or substitutions that can be conceived by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A stator assembly of an electronic water pump, comprising a stator core, characterized in that: The stator assembly also includes at least one positioning portion fixed to the stator core; the positioning portion is provided with an axial positioning surface on one side in the axial direction, and is provided with circumferential positioning surfaces on two opposite sides in the circumferential direction; the axial positioning surface is configured to cooperate with the injection mold to position the stator assembly axially in the injection mold, and the circumferential positioning surface is configured to cooperate with the injection mold to position the stator assembly circumferentially in the injection mold.

2. The stator assembly according to claim 1, characterized in that: A fixing seat is included, the stator core is fixed to the fixing seat, the fixing seat includes a main body and at least one positioning portion, and the at least one positioning portion radially protrudes outward from the outer circumferential surface of the main body.

3. The stator assembly according to claim 2, characterized in that: It also includes a stator winding, a pin electrically connected to the stator winding, and a pin positioning member for fixing the pin. The pin positioning member is fixed to the main body and is located radially outside the stator winding.

4. The stator assembly according to claim 2, characterized in that: It also includes a card plate, a stator winding, a pin electrically connected to the stator winding, and a pin positioning member for fixing the pin. The card plate is radially located on the inner side of the stator winding and fixed to the fixing seat, and the pin positioning member is fixed to the card plate.

5. The stator assembly according to claim 3 or 4, characterized in that: The pin positioning member is provided with a positioning groove open to one axial side, and the groove wall of the positioning groove is provided with a first wire-passing notch which is roughly V-shaped. The pin is partially seated in the positioning groove, and the wire connecting the winding and the pin extends into the positioning groove through the first wire-passing notch.

6. The stator assembly according to claim 3 or 4, characterized in that: It also includes a lead piece; the lead piece is fixed to the main body, radially located outside the winding, provided with a plurality of second wire-passing notches spaced apart in the circumferential direction, and provided with a wiring groove located radially outside; the wire connecting the stator winding and the pin passes through the second wire-passing notch and partially extends in the wiring groove.

7. The stator assembly according to any one of claims 1 to 4, characterized in that: The at least one positioning portion includes a plurality of positioning portions, and the plurality of positioning portions are distributed at intervals along the circumferential direction.

8. An electronic water pump, characterized in that: include: A pump body, formed by insert injection molding using the stator assembly according to any one of claims 1 to 7, covering the stator assembly and forming a rotor cavity; as well as The rotor assembly is rotatably arranged in the rotor cavity relative to the pump body.

9. The electronic water pump according to claim 8, characterized in that: The pump body includes a first covering portion and a second covering portion distributed along the axial direction, the first covering portion and the second covering portion are connected at at least one positioning portion of the stator assembly, the outer diameter of the first covering portion is greater than the outer diameter of the second covering portion, and the outer diameter of the first covering portion is substantially equal to the outer diameter of the at least one positioning portion.

10. The electronic water pump according to claim 9, characterized in that: The pump body further comprises a flange and a joint, wherein the flange protrudes radially outward from the outer circumferential surface of the first covering portion, and the joint is arranged on a side of the second covering portion which is axially away from the first covering portion.

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