Electric pump

Abstract

The utility model relates to an electric pump, the electric pump comprises a stator assembly and an isolation assembly, the isolation assembly comprises an electric connection part and an isolation piece, the electric connection part and the isolation piece are fixed in an injection molding or welding or bonding mode, the electric connection part comprises a winding connection part, the stator assembly comprises an insertion part, and the insertion part is connected with the isolation piece. At least part of the winding connecting part is located in an inserting groove of the inserting part, the winding connecting part is electrically connected with the winding located in the inserting groove, the electric pump comprises a metal guiding part, and the stator assembly comprises a first containing part; the metal guide part is in circumferential contact or abutting connection or close fit with the corresponding wall of the first containing part, the isolation piece comprises a positioning column, the positioning column comprises a positioning groove, and the metal guide part is in circumferential contact or abutting connection or close fit with the groove wall of the positioning groove. The method has the characteristic of improving the yield of the assembly process of the separator and the stator assembly.

Description

Technical Field

[0001] The present application relates to components of a vehicle lubrication system and / or cooling system, and in particular to an electric pump. Background Art

[0002] The electric pump mainly provides a power source for the vehicle's lubrication system and / or cooling system. The electric pump includes an isolator, an electrical connecting pin and a stator assembly. The isolator is fixedly connected to the electrical connecting pin, and the stator assembly is electrically connected to the electrical connecting pin. When the electrical connecting pin is electrically connected to the winding of the stator assembly, the positioning column of the isolator is first inserted into the positioning hole of the insulating part for pre-positioning, and the electrical connecting pin is then inserted into the plug hole of the insulating part to pierce the winding. If the above-mentioned pre-positioning method is adopted, the yield rate of the assembly process of the isolator and the stator assembly is low. Utility Model Content

[0003] The locating post of the isolating piece is first inserted into the locating hole of the insulating part for pre-positioning. If the locating post and the locating hole are precisely positioned, since the isolating piece with the locating post is formed by injection molding, when the isolating piece is press-fitted, the locating post may deviate from the predetermined position due to plastic deformation during injection molding and be broken by stress. Therefore, the locating post and the wall gap corresponding to the locating hole are matched, but the locating post has a certain offset in the locating hole, so that the electrical connection pin may not pierce the winding, and the stator assembly and the isolating piece can only be scrapped as defective products, thereby reducing the yield rate of the isolating piece and stator assembly assembly process. The present application provides an electric pump that is conducive to improving the yield rate of the isolating piece and stator assembly assembly process.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] An electric pump, comprising a stator assembly and an isolation assembly, the isolation assembly comprising an electrical connection portion and an isolation piece, the electrical connection portion being fixed to the isolation piece by injection molding, welding, or adhesive bonding, the electrical connection portion comprising a winding connection portion, the stator assembly comprising a plug-in portion, at least a portion of the winding connection portion being located in a plug-in slot of the plug-in portion, the winding connection portion being electrically connected to the winding located in the plug-in slot, the electric pump comprising a metal guide portion, the stator assembly comprising a first accommodating portion, the metal guide portion being in circumferential contact, abutting, or tightly fitting with a wall corresponding to the first accommodating portion, the isolation piece comprising a positioning column, the positioning column comprising a positioning slot, the metal guide portion being in circumferential contact, abutting, or tightly fitting with a slot wall of the positioning slot.

[0006] In the above technical solution, the electric pump includes a metal guide part, the stator assembly includes a first accommodating part, the metal guide part is in circumferential contact or abutment or tight fit with the wall corresponding to the first accommodating part, the isolating part includes a positioning column, the positioning column includes a positioning groove, the metal guide part is in circumferential contact or abutment or tight fit with the groove wall of the positioning groove, relative to matching the plastic positioning column with the wall gap corresponding to the positioning hole of the insulating part, the deformation of the metal guide part is smaller than the deformation of the plastic part, and the metal guide part and the stator assembly, the metal guide part and the positioning column are pre-positioned. The metal guide part can be fixed with the stator assembly and the positioning column in a predetermined position, which is beneficial to maintaining the relative position between the winding connection part and the groove wall of the plug-in slot, thereby facilitating the electrical connection part to pierce the winding, and further beneficial to improving the yield rate of the assembly process of the isolating part and the stator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a schematic diagram of the three-dimensional structure of the electric pump of this application;

[0008] Figure 2 for Figure 1 A schematic cross-sectional view of the electric pump shown;

[0009] Figure 3 A schematic diagram of a guide portion just about to be inserted into a positioning post of an isolating member;

[0010] Figure 4 is a schematic diagram of the stator assembly and the isolation assembly after assembly from a first perspective;

[0011] Figure 5 is a schematic diagram of the stator assembly and the isolation assembly after assembly from a second perspective;

[0012] Figure 6 for Figure 5 Schematic diagram of the AA section;

[0013] Figure 7 for Figure 6 A magnified schematic diagram of part A;

[0014] Figure 8 Schematic diagram of the connection between the stator assembly and the guide part;

[0015] Figure 9 for Figure 5 Schematic diagram of the isolation component;

[0016] Figure 10 for Figure 8 Schematic diagram of the stator core;

[0017] Figure 11 is a schematic diagram of the first stator punching sheet;

[0018] Figure 12 is a schematic diagram of the second stator punching sheet;

[0019] Figure 13 is a schematic diagram of an electrical connection portion;

[0020] Figure 14 A schematic diagram of the guide portion.

[0021] 1. Pump housing; 11. Pump cover; 12. Pump housing; 13. Motor housing; 14. Isolator; 141. First end face; 142. Positioning post; 142a. First positioning post; 142b. Second positioning post; 1421. Positioning groove; 1422. Extension portion; 1422a. Through hole; 1422b. First hole wall; 1422c. Second hole wall; 1423. Main body; 1423a. Groove; 143. Accommodation groove; 144. Inner circumferential wall; 145. Outer circumferential wall; 15. Bottom cover; 2. Pump rotor; 3. Stator assembly; 31. Insulation portion; 311. Connecting portion; 3111. Connecting groove; 3112. Second end face; 312. Second accommodating portion; 32. Winding; 33. Stator core; 331. First accommodating portion; 331a. Accommodating portion Nano-division; 332, upper surface; 333, lower surface; 334, stator punching sheet; 3341, first stator punching sheet; 3342, second stator punching sheet; 335, core yoke; 336, core neck; 4, motor rotor assembly; 41, motor rotor; 42, shaft; 5, electronic control assembly; 6, isolation assembly; 61, electrical connection part; 611, first division; 6111, winding connection part; 612, second division; 613, third division; 61a, first phase pin; 61b, second phase pin; 61c, third phase pin; 10, pump chamber; 7, metal guide part; 7a, first guide part; 7b, second guide part; 71, guide division; 72, first fixing part; 73, second fixing part; 8, sealing part; 20, motor chamber; 30, electronic control chamber. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other technical solutions can be obtained based on these technical solutions without paying any creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts relative to each other shown in the accompanying drawings. They are only for the clarity and convenience of expressing the technical solutions. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0023] Electric pumps can be used in automotive lubrication and / or cooling systems to provide circulating power for the working medium in the automotive lubrication and / or cooling systems, which in turn can provide lubricating and / or cooling oil to the transmission system. In this application, "A and B are fixedly connected" means that there is no relative displacement between A and B after the connection, for example, when A and B are welded together; "A and B are limitedly connected" means that A limits B's movement in a certain direction, or B limits A's movement in a certain direction.

[0024] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the first embodiment of the electric pump of the present application. The electric pump includes a pump housing 1, which includes a pump cover 11, a pump housing 12, a motor housing 13, an isolator 14, and a bottom cover 15. The pump cover 11 is fixedly connected to the pump housing 12, the pump housing 12 is fixedly connected to the motor housing 13, the motor housing 13 is fixedly connected to the isolator 14, and the isolator 14 is fixedly connected to the bottom cover 15. In this embodiment, the pump cover 11 and the pump housing 12 are detachably connected. Compared with a non-detachable connection, this facilitates the inspection and maintenance of components provided in the inner cavity of the pump housing 12, the inner cavity of the pump cover 11, or the cavity formed by the pump cover 11 and the pump housing 12. For example, by opening the connection between the pump cover 11 and the pump housing 12, the operating condition of the pump rotor 2 can be inspected and the pump rotor 2 can be replaced as needed. The electric pump includes a pump rotor 2, a stator assembly 3, a motor rotor assembly 4, and an electronic control assembly 5. In this embodiment, the motor rotor assembly 4 is located radially inward of the stator assembly 3. The stator assembly 3 is positionally connected to the motor housing 13. The motor rotor assembly 4 includes a motor rotor 41 and a shaft 42. The motor rotor 41 and the shaft 42 are fixedly connected, and the motor rotor 41 is in driving connection with the pump rotor 2. When the electric pump is operating, the electronic control assembly 5 controls the current passing through the stator assembly 3 to vary according to a certain pattern, thereby controlling the stator assembly 3 to generate a varying excitation magnetic field. The motor rotor 41 rotates under the action of the excitation magnetic field, and the motor rotor 41 drives the pump rotor 2 to rotate via the shaft 42. The electric pump includes a pump chamber 10, a motor chamber 20 and an electronic control chamber 30. The pump cover 11 is connected to the pump casing 12 to form the pump chamber 10, the pump casing 12 is connected to the motor housing 13, the motor housing 13 and the isolation member 14 are connected to form the motor chamber 20, and the isolation member 14 is connected to the bottom cover 15 to form the electronic control chamber 30. The pump chamber 10 is connected to the motor chamber 20, and the motor chamber 20 is not connected to the electronic control chamber 30. The pump rotor 2 is located in the pump chamber 10, the stator assembly 3 and the motor rotor 41 are located in the motor chamber 20, and the electronic control assembly 5 is located in the electronic control chamber 30. When the electric pump is working, the working medium can contact the stator assembly 3 and dissipate heat for the stator assembly 3; the electronic control assembly 5 can avoid contacting the working medium, thereby preventing the working medium from affecting the electronic control assembly 5.

[0025] Please refer to Figures 2 to 14The stator assembly 3 includes an insulating portion 31, a winding 32, and a stator core 33. The insulating portion 31 supports the winding 32, and the stator core 33 and the insulating portion 31 are fixedly connected. In this embodiment, the stator core 33 and the insulating portion 31 are fixed by injection molding, for example, the insulating portion 31 is formed by injection molding with the stator core 33 as an insert. The electric pump includes an isolation assembly 6, which includes an isolation member 14 and an electrical connection portion 61. The electrical connection portion 61 and the isolation member 14 are fixedly connected. In this embodiment, the electrical connection portion 61 and the isolation member 14 are fixed by injection molding, for example, the isolation member 14 is formed by injection molding with the electrical connection portion 61 as an insert. In other embodiments, the electrical connection portion 61 and the isolation member 14 are fixed by welding or bonding. The electrical connection part 61 includes a first division 611, a second division 612 and a third division 613. The second division 612 is located between the first division 611 and the third division 613. The first division 611 is located in the motor cavity 20, and the third division 613 is located in the electric control cavity 30. The first division 611 includes a winding connection part 6111, and the winding connection part 6111 is electrically connected to the winding 32. The third division 613 is electrically connected to the electric control component 5. The stator assembly 3 includes a plug-in portion 311, at least part of the winding connection portion 6111 is located in the plug-in slot 3111 of the plug-in portion 311, the winding connection portion 6111 is electrically connected to the winding 32 located in the plug-in slot 3111, the electric pump includes a metal guide portion 7, the stator assembly 3 includes a first accommodating portion 331, the metal guide portion 7 is in circumferential contact or abutment or tight fit with the wall corresponding to the first accommodating portion 331, the isolation member 14 includes a positioning column 142, the positioning column 142 includes a positioning groove 1421, the metal guide portion 7 is in circumferential contact or abutment or tight fit with the groove wall of the positioning groove 1421. Compared to matching the plastic positioning post with the wall clearance corresponding to the positioning hole of the insulating part, the deformation of the metal guide part 7 is smaller than that of the plastic part. By pre-positioning the metal guide part 7 with the stator assembly 3 and the positioning post 142, the metal guide part 7 can be fixed to the stator assembly 3 and the positioning post 142 in a predetermined position, which is beneficial for maintaining the relative position between the winding connection part 6111 and the slot wall of the plug-in slot 3111, thereby facilitating the electrical connection part 61 to pierce the winding 32, and further beneficial for improving the yield rate of the assembly process of the isolation member 14 and the stator assembly 3. The metal guide part 7 circumferentially abuts the wall corresponding to the first accommodating part 331, or the metal guide part 7 is circumferentially tightly matched with the wall corresponding to the first accommodating part 331; the metal guide part 7 circumferentially abuts the slot wall of the positioning slot 1421, or the metal guide part 7 is circumferentially tightly matched with the slot wall of the positioning slot 1421. The metal guide part 7 and the stator assembly 3, and the metal guide part 7 and the positioning column 142 are pre-positioned. The metal guide part 7 can be fixed at a predetermined position with the stator assembly 3 and the positioning column 142, which is beneficial to maintaining the relative position between the winding connection part 6111 and the slot wall of the plug-in slot 3111, thereby facilitating the electrical connection part 61 to pierce the winding 32, and further beneficial to improving the yield rate of the assembly process of the isolation part 14 and the stator assembly 3.

[0026] The isolation member 14 has a first end face 141, and the winding connection portion 6111 protrudes from the first end face 141; the plug-in portion 311 includes a second end face 3112, and the plug-in groove 3111 is recessed from the second end face 3112 in a direction away from the isolation member 14. The metal guide portion 7 includes a guide section 71, and the guide section 71 is close to the isolation member 14 relative to the second end face 3112, and at least part of the guide section 71 is located in the positioning groove 1421 of the positioning column 142; the positioning column 142 includes an extension portion 1422, and the extension portion 1422 protrudes from the first end face 141. In the axial direction of the electric pump, the sum of the length L1 of the extension portion 1422 and the length L2 of the guide section 71 is greater than the length L3 of the winding connection portion 6111. When assembling the isolator 14 and the stator assembly 3, the guide section 71 of the metal guide part 7 first enters the positioning groove 1421, and then guides the winding connection part 6111 to enter the plug-in groove 3111, which is beneficial to maintaining the relative position between the winding connection part 6111 and the slot wall of the plug-in groove 3111, thereby facilitating the electrical connection part 61 to pierce the winding 32, and further facilitating improving the yield rate of the assembly process of the isolator 14 and the stator assembly 3.

[0027] Please refer to Figures 4 to 14 The stator core 33 includes a first accommodating portion 331, and the metal guide portion 7 includes a first fixing portion 72. The first fixing portion 72 is interference fit with the wall corresponding to the first accommodating portion 331. During the assembly process of the stator assembly 3 and the isolation member 14, the metal guide portion 7 is not easy to shift, which is conducive to the metal guide portion 7 having a better pre-positioning effect. The insulating part 31 includes a plug-in part 311; the metal guide part 7 includes a second fixing part 73, the second fixing part 73 extends from the first fixing part 72 toward the direction close to the isolating part 14, and the second fixing part 73 is fixed to the insulating part 31 by injection molding. The metal guide part 7 is first interference fit with the stator core 33, and then the stator core 33 is used as an insert for injection molding to form the insulating part 31. The process is relatively simple, and the position of the metal guide part 7 can be further limited during injection molding, which is beneficial to reducing the risk of the metal guide part 7 falling off from the stator assembly 3. The metal guide part 7 is not easy to shift, which is beneficial to the metal guide part 7 having a better pre-positioning effect; or, the insulating part 31 includes a second accommodating part 312, the second accommodating part 312 is connected to the first accommodating part 331, the second fixing part 73 is matched with the wall gap corresponding to the second accommodating part 312, and the stator core 33 is used as an insert for injection molding to form the insulating part 31 including the second accommodating part 312. The precision of the second accommodating part 312 can be relatively low, which is beneficial to reducing the process requirements during injection molding.

[0028] Please refer to Figures 10 to 12 The stator core 33 includes a plurality of stacked stator punching sheets 334, which are fixed as a whole by riveting or stamping. In one embodiment, please refer to Figure 6 、 Figures 9 to 11The stator core 33 has an upper surface 332 and a lower surface 333. The first accommodating portion 331 is recessed from the upper surface 332 toward the lower surface 333. The stator punching 334 includes a first stator punching 3341 and a second stator punching 3342. In the axial direction of the electric pump, the first stator punching 3341 is closer to the electronic control component than the second stator punching 3342. The first stator punching 3341 has an accommodating sub-portion 331a. The accommodating sub-portion 331a passes through the upper surface and the lower surface of the second stator punching 3342. The first stator punching 3341 is stacked to form the first accommodating portion 331. The second stator punching 3342 does not have an accommodating sub-portion. The second stator punching 3342 can block an opening of the first accommodating portion 331 to fix the stator core 333. When the sub-core 33 is an insert for injection molding, liquid plastic is not easy to flow into the first accommodating portion 331, which is beneficial to increasing the contact area between the metal guide portion 7 and the stator core 33; in one embodiment, the stator core 33 includes a plurality of stacked first stator punchings 3341, the first accommodating portion 331 passes through the upper surface 332 and the lower surface 333, the first stator punching 3341 has an accommodating section 331a, the accommodating section 331a passes through the upper surface and the lower surface of the first stator punching 3341, and a plurality of first stator punchings 3341 are stacked to form the first accommodating portion 331. The preparation process of each stator punching 334 is the same, which is beneficial to improving the preparation efficiency of the stator core 33, and can also relatively reduce the weight of the stator core 33.

[0029] Please refer to Figure 10 The stator core 33 includes a core yoke 335 and a core neck 336. The core neck 336 extends from the core yoke 335 toward the axial direction of the stator core 33. The core yoke 335 includes a partial wall surface that defines the first accommodating portion 331. The core neck 336 includes a partial wall surface that defines the first accommodating portion 331. The first accommodating portion 331 is located at the connection between the core yoke 335 and the core neck 336. The winding slot that accommodates part of the winding is located between two adjacent core necks, which is beneficial to reducing the occupation of the winding space of the winding and is beneficial for the electric pump to have a better slot fill rate.

[0030] Please refer to Figures 5 to 9 、 Figure 13 and Figure 14The positioning post 142 includes a main body 1423, which extends from the extension portion 1422 away from the stator assembly 3. The positioning groove 1421 includes a through-hole 1422a in the extension portion 1422 and a groove 1423a in the main body 1423. The guide portion 71 contacts the bottom of the groove 1423a, which can help confirm whether the winding connection portion 6111 has pierced the winding 32, thereby improving the connection reliability between the winding connection portion 6111 and the winding 32. The extension portion 1422 includes a first hole wall 1422b and a second hole wall 1422c defining the through-hole 1422a. The first hole wall 1422b extends obliquely from the second hole wall 1422c away from the axis of the positioning post 142. The axis of the positioning post 142 is parallel to the central axis of the electric pump. The first hole wall 1422b has a certain inclination to reduce the resistance of the metal guide portion 7 when inserting into the positioning post 142. The metal guide part 7 includes a first guide part 7a and a second guide part 7b. The first guide part 7a is a cotter pin, a rolled pin or a solid pin; the second guide part 7b is a cotter pin, a rolled pin or a solid pin. The metal guide part 7 is a metal part, and the stator core 33 is made of metal. The fit between the metal guide part 7 and the stator core 33 is the fit between metal parts, and the fit between the two is of high precision.

[0031] Please refer to Figures 2 to 9 The electric pump includes a sealing portion 8, an isolating member 14 which is an injection molded part, and the isolating member 14 has a receiving groove 143. The isolating member 14 includes an inner peripheral wall 144 and an outer peripheral wall 145. The receiving groove 143 is recessed from the outer peripheral wall 145 toward the inner peripheral wall 144. In the radial direction of the electric pump, at least part of the sealing portion 8 is located between the groove wall forming the receiving groove 143 and the motor housing 13; at least part of the positioning column 142 extends from the inner peripheral wall 144 toward the axis of the electric pump. Along the same radial direction of the electric pump, the projection of the positioning column 142 on the first plane covers the projection of at least part of the groove wall on the first plane. The axis of the electric pump is parallel to the first plane. The axis of the electric pump is the axis of the motor rotor assembly. Since in the radial direction of the electric pump, the distance from the groove wall of the accommodating groove 143 to the inner peripheral wall 144 is smaller than the distance from the inner peripheral wall 144 to the outer peripheral wall 145, the isolating member 14 will shrink unevenly when it changes from liquid to solid during the injection molding process. The positioning column 142 is arranged corresponding to the accommodating groove 143, which can reduce the internal stress formed during shrinkage and can relatively reduce the amount of shrinkage from liquid to solid when the accommodating groove 143 is formed by injection molding, which is beneficial to control the size of the accommodating groove 143 of the isolating member 14.

[0032] In this embodiment, please refer to Figure 9The electrical connection part 61 includes a first phase pin 61a, a second phase pin 61b and a third phase pin 61c, and the positioning column 142 includes a first positioning column 142a and a second positioning column 142b. The first positioning column 142a is arranged corresponding to the first guide part 7a, and the second positioning column 142b is arranged corresponding to the second guide part 7b. In the circumferential direction of the isolating part 14, the first positioning column 142a is located between the first phase pin 61a and the second phase pin 61b, and the second positioning column 142b is located between the second phase pin 61b and the third phase pin 61c. By arranging the positioning column 142 between the two phase pins, the accuracy of inserting the winding connection part 6111 into the plug-in slot 3111 can be further improved.

[0033] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0034] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art would be able to make various modifications and variations without departing from the spirit of the present application, and all such modifications and variations fall within the scope of protection of the present application.

Claims

1. An electric pump, characterized in that: The electric pump comprises a stator assembly (3) and an isolation assembly (6); the isolation assembly (6) comprises an electrical connection portion (61) and an isolation member (14); the electrical connection portion (61) and the isolation member (14) are fixed by injection molding, welding, or bonding; the electrical connection portion (61) comprises a winding connection portion (6111); the stator assembly (3) comprises a plug-in portion (311); at least a portion of the winding connection portion (6111) is located in a plug-in slot (3111) of the plug-in portion (311); the winding connection portion (6111) The electric pump is electrically connected to the winding (32) located in the plug-in slot (3111), the electric pump includes a metal guide portion (7), the stator assembly (3) includes a first accommodating portion (331), the metal guide portion (7) is in circumferential contact with, abutting against, or tightly fitting with the wall corresponding to the first accommodating portion (331), the isolating member (14) includes a positioning column (142), the positioning column (142) includes a positioning slot (1421), and the metal guide portion (7) is in circumferential contact with, abutting against, or tightly fitting with the slot wall of the positioning slot (1421).

2. The electric pump according to claim 1, characterized in that The isolating member (14) has a first end face (141), and the winding connecting portion (6111) protrudes from the first end face (141); the plug-in portion (311) includes a second end face (3112), and the plug-in slot (3111) is recessed from the second end face (3112) in a direction away from the isolating member (14); the metal guide portion (7) includes a guide sub-portion (71), and the guide sub-portion (71) is relatively close to the second end face (3112). ) is close to the isolation member (14), and at least part of the guide section (71) is located in the positioning groove (1421); the positioning column (142) includes an extension portion (1422), and the extension portion (1422) protrudes from the first end face (141). In the axial direction of the electric pump, the sum of the length (L1) of the extension portion (1422) and the length (L2) of the guide section (71) is greater than the length (L3) of the winding connection portion (6111).

3. The electric pump according to claim 1 or 2, characterized in that The stator assembly (3) includes a stator core (33), the stator core (33) includes the first accommodating portion (331), the metal guide portion (7) includes a first fixing portion (72), and the first fixing portion (72) is interference-fitted with a wall corresponding to the first accommodating portion (331).

4. The electric pump according to claim 3, characterized in that The stator assembly (3) includes an insulating portion (31), the insulating portion (31) is fixedly connected to the stator core (33), and the insulating portion (31) includes the plug-in portion (311); the metal guide portion (7) includes a second fixing portion (73), and the second fixing portion (73) extends from the first fixing portion (72) toward the direction close to the isolation member (14); the second fixing portion (73) is fixed to the insulating portion (31) by injection molding; or, the insulating portion (31) includes a second accommodating portion (312), the second accommodating portion (312) is communicated with the first accommodating portion (331), and the second fixing portion (73) is matched with the wall gap corresponding to the second accommodating portion (312).

5. The electric pump according to claim 3 or 4, characterized in that: The stator core (33) has an upper surface (332) and a lower surface (333), and the first accommodating portion (331) is recessed from the upper surface (332) toward the lower surface (333); or the first accommodating portion (331) passes through the upper surface (332) and the lower surface (333).

6. The electric pump according to any one of claims 3 to 5, characterized in that: The stator core (33) includes a core yoke (335) and a core neck (336), wherein the core neck (336) extends from the core yoke (335) toward the axis of the electric pump, the core yoke (335) includes a partial wall surface defining the first accommodating portion (331), and the core neck (336) includes a partial wall surface defining the first accommodating portion (331).

7. The electric pump according to claim 2, characterized in that The positioning column (142) includes a main body (1423), the main body (1423) extends from the extension portion (1422) in a direction away from the stator assembly (3), the positioning groove (1421) includes a through hole (1422a) of the extension portion (1422) and a groove (1423a) of the main body (1423), and the guide portion (71) contacts the bottom of the groove (1423a).

8. The electric pump according to any one of claims 1 to 7, characterized in that: The metal guide part (7) comprises a first guide part (7a) and a second guide part (7b), wherein the first guide part (7a) is a cotter pin, a rolled pin or a solid pin; and the second guide part (7b) is a cotter pin, a rolled pin or a solid pin.

9. The electric pump according to claim 8, characterized in that The electrical connection portion (61) includes a first phase pin (61a), a second phase pin (61b) and a third phase pin (61c); the positioning column (142) includes a first positioning column (142a) and a second positioning column (142b); in the circumferential direction of the isolating member (14), the first positioning column (142a) is located between the first phase pin (61a) and the second phase pin (61b), and the second positioning column (142b) is located between the second phase pin (61b) and the third phase pin (61c).

10. The electric pump according to any one of claims 1 to 9, characterized in that: The electric pump includes a motor housing (13), the isolating member (14) is an injection molded member, the isolating member (14) is fixedly connected to the motor housing (13), the isolating member (14) has a receiving groove (143), the isolating member (14) includes an inner peripheral wall (144) and an outer peripheral wall (145), the receiving groove (143) is recessed from the outer peripheral wall (145) toward the inner peripheral wall (144); at least part of the positioning column (142) extends from the inner peripheral wall (144) toward the axis of the electric pump, and along the same radial direction of the electric pump, the projection of the positioning column (142) on a first plane covers at least part of the projection of the groove wall of the receiving groove (143) on the first plane, and the axis of the electric pump is parallel to the first plane.

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