Electric pump

Abstract

An electric pump (100) is disclosed, which includes a stator winding (131) and a housing (134). The housing (134) includes a first housing (1341) and a second housing (1342), the first housing (1341) being formed by injection molding a first unit (136) with the stator winding (131) as an insert. The second housing (1342) is formed to be injection molded with the first unit (136) as an insert, and the housing (134) includes a protrusion (1341c) and an engaging portion (1342d). One of the protrusion (1341c) and the engaging portion (1342d) is provided in the first housing (1341), and the other is provided in the second housing (1342). Along the axial direction of the electric pump (100), the protrusion (1341c) and the engaging portion (1342d) are engaged in such a way that their position is restricted. This electric pump (100) is advantageous in restricting the position of the second housing (1342), and furthermore, when an external force acts on the electric pump (100), the risk of the first housing (1341) and the second housing (1342) separating is reduced.

Description

Technical Field

[0001] This application claims the priority of two Chinese patent applications, one filed with the China National Intellectual Property Administration on March 28, 2023, with the application number 202310315730.X and the invention title "Electric Pump", and the other filed with the China National Intellectual Property Administration on March 28, 2023, with the application number 202310335358.9 and the invention title "Electric Pump", and all of its content is incorporated herein by reference.

[0002] The present invention relates to a fluid pump, particularly an electric pump.

Background Art

[0003] An electric pump includes a stator winding and a housing. The housing is an injection molded body formed by at least two injection moldings. Reducing the risk of separation between the injection molded bodies formed by two injection moldings by an external force is a technical problem that those skilled in the art need to consider.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present invention is to provide an electric pump that is advantageous for performing position limitation on a second housing and further reduces the risk of separation between a first housing and the second housing.

Means for Solving the Problems

[0005] In view of this, the present invention An electric pump comprising a stator winding and a housing, the housing comprising a first housing and a second housing, at least a portion of the first housing being formed to be injection molded with the stator winding as an insert, the first unit being defined to include the first housing and the stator winding, at least a portion of the second housing being formed to be injection molded with the first unit as an insert, the housing comprising a protrusion and an engaging portion, one of the protrusion and the engaging portion being provided on the first housing and the other on the second housing, the protrusion and the engaging portion being engaged such that their positions are restricted along the axial direction of the electric pump.

[0006] The housing in the present invention includes a protrusion and an engaging portion, one of which is provided in the first housing and the other in the second housing, and the protrusion and the engaging portion are engaged in such a way that their positions are restricted. Thus, it is advantageous to impose positional restrictions on the second housing, and furthermore, it reduces the risk of the first and second housings separating when an external force acts on the electric pump. [Brief explanation of the drawing]

[0007] [Figure 1] This is a three-dimensional view of an electric pump, which is a first embodiment of the present invention. [Figure 2] Figure 1 is an exploded view of the electric pump. [Figure 3] This is a structural diagram of the electric pump along the XX cross-section shown in Figure 1. [Figure 4] Figure 1 is a three-dimensional view of the stator windings of the electric pump. [Figure 5] Figure 1 is a three-dimensional view of the stator unit of the electric pump. [Figure 6] Figure 5 is an exploded view of the stator unit. [Figure 7] This is a cross-sectional view of the stator unit along the YY direction in Figure 5. [Figure 8] This is a three-dimensional view of the first unit from one direction. [Figure 9] This is a cross-sectional view of the first unit along the ZZ line in Figure 8. [Figure 10] This is a three-dimensional view of the second housing in Figure 5. [Figure 11] This is a cross-sectional view of the second housing in one direction in Figure 10. [Figure 12] This is a cross-sectional view of the stator unit along the Y'-Y' line in Figure 5. [Figure 13] Figure 5 is a three-dimensional view of the connecting plate unit assembled onto the stator winding. [Figure 14] This is a three-dimensional view of the connecting plate unit (with the connector removed) in Figure 13. [Figure 15] Figure 13 is a cross-sectional view of another embodiment of the connecting plate unit. [Figure 16] Figure 15 is a three-dimensional view showing the main body fitted into the position limiting member. [Figure 17] Figure 15 is a three-dimensional view showing a portion of the pin section fitted into the connector. [Figure 18] Figure 15 is a three-dimensional view of another embodiment in which a portion of the pin portion is fitted into the connector. [Figure 19] This is a cross-sectional view of the second housing along AA in Figure 11. [Modes for carrying out the invention]

[0008] The present invention will be further described below based on the drawings and examples.

[0009] The present invention will be further described below with reference to the drawings. First, the directional terms such as top, bottom, left, right, front, back, inside, outside, ceiling, and bottom, as mentioned or referable in the specification of this invention, are defined to correspond to the structure in the drawings and are relative concepts, and therefore may change accordingly depending on different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0010] The electric pump 100 in the following embodiments can provide flowing power to the working medium of the vehicle thermal management system. The working medium may be an aqueous solution containing 50% ethylene glycol or fresh water, or other substances.

[0011] As shown in FIGS. 1 to 19, the electric pump 100 of the present invention includes a pump cover 11, a rotating unit 12, and a stator unit 13. The stator unit 13 includes a connection plate unit 132, a stator winding 131, a pump shaft 133, and a housing 134. The pump cover 11 and the stator unit 13 are hermetically fixed. Here, the hermetic fixation can prevent the working medium from leaking outside the electric pump 100 when the electric pump 100 operates. The pump shaft 133 and the housing 134 are injection molded and fixed. The electric pump 100 includes a pump cavity 20. The rotating unit 12 is located in the pump cavity 20. The pump cavity 20 includes a rotor cavity 141 and a blade cavity 15 that communicate with each other. The rotating unit 12 includes a rotor unit 122 and a blade unit 121. The rotor unit 122 includes permanent magnets. At least a part of the rotor unit 122 is located in the rotor cavity 141. The blade unit 121 is located in the blade cavity 15. The working medium flows in the pump cavity 20. At least a part of the other end of the pump shaft 133 is located in the rotor cavity 141. At least a part of the rotating unit 12 is externally fitted on the outer periphery of the pump shaft 133. The rotating unit 12 and the pump shaft 133 are connected so as to transmit power. In another embodiment, the rotating unit 12 and the pump shaft 133 are fixedly connected, and the pump shaft 133 rotates along with the rotor unit 122. The connection plate unit 132 includes a position limiting member 1321 and a conductive member 1322. The position limiting member 1321 is connected or fixed to the stator winding 131 so as to be limited in position, and the conductive member 1322 is connected or fixed to the position limiting member 1321 so as to be limited in position. Specifically, a portion of the conductive member 1322 is fitted into the position limiting member 1321, and the position limiting member 1321 is an injection-molded member. The conductive member 1322 includes a first connection end and a second connection end. The first connection terminal can be electrically connected to the stator winding 131, and the second connection terminal can function as a pin terminal for electrical connection to the external power supply of the electric pump 100. In another implementation, the electric pump 100 does not need to include the pump cover 11, and the pump cover 11 is integrated into an external structure. This arrangement offers advantages in the integrated design of the electric pump 100, resulting in a more compact structure for the electric pump 100, and thus advantages in miniaturization and weight reduction of the electric pump 100 structure. When the electric pump 100 is operating, the current in the stator winding 131 is controlled, which in turn controls the excitation magnetic field generated from the stator winding 131. The rotation unit 12 rotates around the pump shaft 133 due to the action of the excitation magnetic field.

[0012] As shown in Figure 4, the stator winding 131 includes a stator core 1311, an insulating frame 1312, and windings 1313. The number of windings 1313 is at least three, and the insulating frame 1312 covers at least a portion of the surface of the stator core 1311, isolating the windings 1313 from the stator core 1311 to provide electrical insulation. The insulating frame 1312 and the stator core 1311 may be a single, integrated structural component. Specifically, one implementation method involves using the stator core 1311 as an insert and forming the insulating frame 1312 by injection molding. In another embodiment, the insulating frame 1312 and the stator core 1311 are arranged separately, where “separate arrangement” means that the insulating frame 1312 and the stator core 1311 are machined as two separate parts, and then assembled and mounted, or connected in a position-restricted or fixed manner. In this embodiment, the insulating frame 1312 is formed by injection molding with the stator core 1311 as an insert. Here, the stator core 1311 and the insulating frame 1312 are integrated into a single structure. The winding 1313 is wrapped around the insulating frame 1312. The winding 1313 includes nine windings, and of course, in other embodiments, the winding 1313 may include other numbers of windings, such as three, six, or twelve.

[0013] As shown in Figures 3 to 19, the first housing 1341 is formed to be injection molded with at least the stator windings 131 as an insert, specifically, at least a portion of the first housing 1341 is formed to be injection molded with the stator windings 131 as an insert, and the first unit 136 is defined to include the first housing 1341 and the stator windings 131, and the second housing 1342 is formed to be injection molded with at least the first unit 136 and the pump shaft 133 as an insert, specifically, at least a portion of the second housing 1342 is formed to be injection molded with the first unit 136 as an insert, and the second housing 1342 includes the rotor cavity side portion 1412. Furthermore, a working fluid can flow through the pump cavity 20, and the wall portion corresponding to the pump cavity 20 includes the rotor cavity side portion 1412, and at least a portion of the material of the rotor cavity side portion 1412 is different from the material of the first housing 1341. In this way, when the electric pump 100 is in operation, the requirements for the material performance level of the first housing 1341, such as the hydrolysis resistance level, can be reduced, and the manufacturing cost of the electric pump 100 can be further reduced.

[0014] As shown in Figure 12, the first housing 1341 may include the rotor cavity bottom 1411, and the second housing 1342 may also include the rotor cavity bottom 1411. As shown in Figure 12, the first housing 1341 is formed by injection molding with the stator windings 131 and pump shaft 133 as inserts, and the first unit 136 includes the first housing 1341, pump shaft 133 and stator windings 131. The second housing 1342 is formed so as to be injection molded with the first unit 136 as an insert, and the first housing 1341 includes the rotor cavity bottom 1411. The electric pump 100 includes a pump shaft 133, which includes a fixing portion 1331 fitted into the bottom 1411 of the rotor cavity. In this way, the pump shaft 133 and the stator winding 131 are located in the same injection molding step, which reduces the cost of the electric pump 100 and improves the coaxiality between the pump shaft 133 and the stator winding 131. In another embodiment, as shown in Figures 3 to 11, the first housing 1341 is formed by injection molding with the stator winding 131 as an insert, the first unit 136 includes the first housing 1341 and the stator winding 131, and the second housing 1342 is formed by injection molding with the pump shaft 133 and the first unit 136 as inserts.

[0015] As shown in Figures 3 to 11, the second housing 1342 includes a cylindrical portion 1342b, which includes a rotor cavity bottom 1411 and a rotor cavity side portion 1412, and the wall portion corresponding to the pump cavity 20 further includes the rotor cavity bottom 1411. Furthermore, at least a portion of either the rotor cavity bottom 1411 or the rotor cavity side 1412 is made of a different material than the first housing 1341. Thus, when the electric pump 100 is operating, a working fluid is present in the rotor cavity 141. During the second injection molding, the wall portion corresponding to the rotor cavity 141 is formed simultaneously with the rotor cavity bottom 1411 and the rotor cavity side portion 1412. This reduces the joint surface between the rotor cavity bottom 1411 and the rotor cavity side portion 1412, thereby reducing the risk of the working fluid in the rotor cavity 141 leaking from the joint surface when the electric pump 100 is operating. Furthermore, at least a portion of the material of either the rotor cavity bottom 1411 or the rotor cavity side portion 1412 is different from the material of the first housing 1341, thus reducing the manufacturing cost of the electric pump 100.

[0016] Furthermore, as shown in Figures 3-11, the pump cavity 20 includes a rotor cavity 141, and the electric pump 100 includes a rotor unit 122. Furthermore, at least a portion of this rotor unit 122 is located in the rotor cavity 141, and the wall portion corresponding to the rotor cavity 141 includes a rotor cavity bottom 1411 and a rotor cavity side 1412, and the material of both the rotor cavity bottom 1411 and the rotor cavity side 1412 is different from the material of the first housing 1341. Thus, since the materials of the rotor cavity bottom 1411 and the rotor cavity side 1412 are different from the materials of the first housing 1341, the manufacturing cost of the electric pump 100 can be reduced and the service life of the electric pump 100 can be extended.

[0017] As shown in Figures 3 to 12, the second housing 1342 is formed to be injection-molded with at least the first unit 136 as an insert, and the first housing 1341 and the second housing 1342 are injection-molded and fixed together, and the second housing 1342 includes a radially extending segment 1342a. Furthermore, along the radial direction of the electric pump 100, the radially extending segment 1342a is provided radially outward from the rotor cavity side portion 1412, and the pump cavity 20 includes the blade cavity 15. The electric pump 100 includes a blade unit 121, at least a portion of which is located in a blade cavity 15, and the wall portion corresponding to the blade cavity 15 includes a radially extending segment 1342a. Furthermore, at least a portion of the material of this radially extending segment 1342a is different from the material of the first housing 1341. Specifically, the second housing 1342 includes a rotor cavity side portion 1412 and a radially extending segment 1342a, and in another embodiment, the second housing 1342 includes a cylindrical portion 1342b and a radially extending segment 1342a. Furthermore, this cylindrical portion 1342b includes a rotor cavity bottom portion 1411 and a rotor cavity side portion 1412, and the wall portion corresponding to the rotor cavity 141 includes the rotor cavity bottom portion 1411 and the rotor cavity side portion 1412. Furthermore, the radially extending segment 1342a is provided radially outward of the cylindrical portion 1342b along the radial direction of the electric pump 100. Specifically, the wall portion corresponding to the blade cavity 141 includes the radially extending segment 1342a, the electric pump 100 includes a pump cavity 20, and when the electric pump 100 is operating, a working medium can flow through the pump cavity 20. The wall portion corresponding to the pump cavity 20 includes the cylindrical portion 1342b and the radially extending segment 1342a, and at least a portion of the material of the radially extending segment 1342a and the cylindrical portion 1342b is different from the material of the first housing 1341. In this way, when the electric pump 100 is operating, the requirements for the material performance level of the first housing 1341, which is not in contact with the working medium, such as the hydrolysis resistance level, are reduced, and the manufacturing cost of the electric pump 100 is further reduced. At the same time, when the electric pump 100 is operating, the working medium is present in the rotor cavity 141 and the blade cavity 15, and during the second injection molding, the wall surface corresponding to the rotor cavity 141 and the wall surface corresponding to the blade cavity 15 are formed simultaneously. With respect to the wall surface corresponding to the radially extending segment 1342a and the rotor cavity 141, the rotor cavity bottom 1411 and the rotor cavity side 1412 are not located in the same injection molding step, thereby reducing the direct contact surface between the radially extending segment 1342a and the rotor cavity side 1412, and further reducing the risk of the working fluid present in the rotor cavity 141 and blade cavity 15 leaking from the aforementioned contact surface.

[0018] As shown in Figures 3 to 11, the first unit 136 comprises a first cavity 1362, and the wall portion corresponding to the first cavity 1362 includes a bottom portion 1362a and a side portion 1362b. The bottom portion 1362a is provided at one end of the side portion 1362b, and the second housing 1342 includes the rotor cavity bottom portion 1411 and the rotor cavity side portion 1412. The rotor cavity bottom 1411 and the rotor cavity side 1412 are sealed and connected so as to be injection molded, and the rotor cavity bottom 1411 is positioned above the bottom 1362a of the first cavity 1362 and is positioned to contact the bottom 1362a of the first cavity 1362, and the wall portion corresponding to the rotor cavity 141 includes the rotor cavity bottom 1411 and the rotor cavity side 1412. The rotor cavity bottom 1411 covers the bottom 1362a of the first cavity 1362 in the radial direction of the electric pump 100, and the rotor cavity side 1412 is positioned radially inward of the side 1362b of the first cavity 1362 and is arranged to contact the side 1362b of the first cavity 1362, and along the circumferential direction of the side 1362b of the first cavity 1362, the rotor cavity side 1412 covers the side 1362b of the first cavity 1362. Thus, the housing is formed by at least two injection molding processes, which improves the appearance quality of the wall portion corresponding to the rotor cavity 141, for example, the cylindricity of the wall portion corresponding to the rotor cavity, and further improves the efficiency of the electric pump.

[0019] As shown in Figures 7 to 9, the inner wall surface of the side portion 1362b may include only the inner wall surface of the first housing 1341. When the inner wall surface of the side portion 1362b covers the inner wall surface of the stator core 1311 during the first injection molding, the rotor cavity side portion 1412 is provided on the inner wall surface of the side portion 1362b during the second injection molding to ensure a small magnetic air gap between the stator core 1311 and the rotor unit, and the thickness of the rotor cavity side portion 1412 is reduced. In order to increase the thickness of the rotor cavity side portion 1412 and improve its strength, one implementation is that the inner wall surface of the side portion 1362b includes the inner wall surface of the stator core 1311 and the inner wall surface of the first housing 1341. Specifically, the first unit 136 includes a positioning portion, the positioning portion includes a support portion and a position limiting portion, the support portion is located at the end of the stator core 1311, and the position limiting portion is located on the outer peripheral side of the stator core 1311. During the first injection molding, the support section and the position limiting section work together to serve as the positioning reference for the injection molding process. The first housing 1341 positions the parts other than the positioning portion and the inner wall surface of the stator core 1311 within the first main body portion 1341a, and the first housing 1341 isolates the parts other than the positioning portion and the inner wall surface of the stator core 1311 from the air. In this way, a small magnetic air gap between the stator core 1311 and the rotor unit can be guaranteed, and the strength of the rotor cavity side portion 1412 can be improved.

[0020] As another specific embodiment, as shown in Figures 7 to 9, the first housing 1341 and the second housing 1342 are injection-molded and fixed together, and the second housing 1342 includes a cylindrical portion 1342b and a radially extending segment 1342a. Furthermore, this cylindrical portion 1342b includes a rotor cavity bottom portion 1411 and a rotor cavity side portion 1412, and the wall portion corresponding to the rotor cavity 141 includes the rotor cavity bottom portion 1411 and the rotor cavity side portion 1412. The radially extending segment 1342a is provided radially outward of the cylindrical portion 1342b along the radial direction of the electric pump 100, and here and below, "radially outward" refers to a direction perpendicular to the axial direction of the electric pump 100 and away from the axis of the electric pump 100. Specifically, the wall portion corresponding to the blade cavity 141 includes a radially extending segment 1342a, the electric pump 100 includes a pump cavity 20, and when the electric pump 100 is operating, a working medium can flow through the pump cavity 20, the wall portion corresponding to the pump cavity 20 includes a cylindrical portion 1342b and a radially extending segment 1342a, and the material of the first housing 1341 is different from the material of the second housing 1342. In this way, when the electric pump 100 is operating, the requirements for the material performance level of the first housing 1341, which is not in contact with the working medium, such as the hydrolysis resistance level, are reduced, and the manufacturing cost of the electric pump 100 is further reduced. At the same time, when the electric pump 100 is operating, the working medium is present in the rotor cavity 141 and the blade cavity 15, and during the second injection molding, the wall surface corresponding to the rotor cavity 141 and the wall surface corresponding to the blade cavity 15 are formed simultaneously. With respect to the radially extending segment 1342a and the wall surface corresponding to the rotor cavity 141, the rotor cavity bottom 1411 and the rotor cavity side 1412 are not located in the same injection molding step, thereby reducing the direct contact surface between the radially extending segment 1342a and the rotor cavity side 1412, and further reducing the risk of the working fluid present in the rotor cavity 141 and blade cavity 15 leaking from the aforementioned contact surface.

[0021] Furthermore, as shown in Figures 1-12, the hydrolysis resistance of the material of the first housing 1341 is lower than that of the polyphenylene sulfide (PPS) material, while the hydrolysis resistance of the material of the second housing 1342 is higher than that of the polyphenylene sulfide material. The material for the first housing 1341 includes, but is not limited to, thermoplastic polyester material, and the thermoplastic polyester material includes, but is not limited to, polybutylene terephthalate (PBT), and a material having overall performance such as heat resistance, flame retardancy, and electrical insulation may be selected for the first housing 1341. The material for the second housing 1342 includes, but is not limited to, thermoplastic resin material, and specifically a material that has hydrolysis resistance, heat resistance, is weldable, has low dimensional shrinkage, and low hygroscopicity may be selected for the material for the second housing 1342, and the thermoplastic resin material includes, but is not limited to, polyphenylene sulfide (PPS). In this way, the manufacturing cost of the electric pump 100 can be reduced, and the service life of the electric pump 100 can be extended.

[0022] As shown in Figures 3 to 19, the first unit 136 comprises a first cavity 1362, and the wall portion corresponding to the first cavity 1362 includes a bottom portion 1362a and a side portion 1362b. The bottom portion 1362a is provided at one end of the side portion 1362b, and the second housing 1342 includes a rotor cavity bottom portion 1411 and a rotor cavity side portion 1412, the rotor cavity bottom portion 1411 and the rotor cavity side portion 1412 are sealed and connected so as to be injection molded, the rotor cavity bottom portion 1411 is located above the bottom portion 1362a of the first cavity 1362 and is positioned to contact the bottom portion 1362a of the first cavity 1362, and the wall portion corresponding to the rotor cavity 141 includes the rotor cavity bottom portion 1411 and the rotor cavity side portion 1412. In the radial direction of the electric pump 100, the rotor cavity bottom 1411 covers the bottom 1362a of the first cavity 1362, and the rotor cavity side 1412 is located radially inward of the side 1362b of the first cavity 1362 and is positioned to contact the side 1362b of the first cavity 1362, and along the circumferential direction of the side 1362b of the first cavity 1362, the rotor cavity side 1412 covers the side 1362b of the first cavity 1362. Thus, the housing is formed by at least two injection molding processes, improving the appearance quality of the wall portion corresponding to the rotor cavity 141, for example, the cylindricity of the wall portion corresponding to the rotor cavity, and further improving the efficiency of the electric pump.

[0023] As shown in Figures 3 to 19, the first housing 1341 is formed to be injection-molded with at least the stator windings 131 as an insert, the first unit 136 is defined to include the first housing 1341 and the stator windings 131, the second housing 1341 is formed to be injection-molded with at least the first unit 136 and the pump shaft 133 as an insert, the first housing 1341 and the second housing 1342 are injection-molded and fixed together, and the housing 134 includes a protrusion 1341c and an engaging portion 1342d. Furthermore, one of the two protrusions 1341c and engaging portion 1342d is provided on the first housing 1341, and the other is provided on the second housing 1342. The protrusions 1341c and engaging portion 1342d are engaged in such a way that their positions are restricted, thereby preventing the second housing 1342 from being displaced relative to the first housing 1341 along the axial direction of the electric pump 100. Specifically, the protrusion 1341c and the engaging portion 1342d are fixed and connected by injection molding. As is well known, the operating environment of the electric pump 100 is complex, and the first housing 1341 and the second housing 1342 are injection molded bodies. The first housing 1341 and the second housing 1342 are injection molded and fixed together, and if the connection strength between the first housing 1341 and the second housing 1342 is not strong enough to withstand the effects of external forces, the first housing 1341 and the second housing 1342 may separate. By arranging them in this manner, it is possible to restrict the axial position of the second housing 1342, where the axial direction is the axial direction of the electric pump 100, and the risk of the first housing 1341 and the second housing 1342 separating can be reduced. Here, external forces include, but are not limited to, the internal stresses experienced by the electric pump 100 in alternating hot and cold environments, and the external forces experienced by the electric pump 100 due to vibrations under each operating condition.

[0024] As shown in Figures 2 to 19, the protrusion 1341c may be provided on the first housing 1341 or on the second housing 1342, and the engaging portion 1342d may be provided on the first housing 1341 or on the second housing 1342. In this embodiment, the protrusion 1341c is provided on the second housing 1342, and the engaging portion 1342d is provided on the first housing 1341. As shown in Figures 5 to 19, the engaging portion 1342d is provided on the second housing 1342, the flange portion 1342c includes an inner wall surface 1342h and an outer wall surface 1342r, and along the radial direction of the electric pump 100, the inner wall surface 1342h approaches the cylindrical portion 1342b relative to the outer wall surface, and the engaging portion 1342d includes a position limiting groove 1342g. Furthermore, this position limiting groove 1342g is recessed in the inner wall surface 1342h and does not penetrate the outer wall surface 1342r, and here the position limiting groove 1342g has a position limiting groove bottom. The first housing 1341 includes a first body portion 1341a and a first edge portion 1341b, where at least a portion of the stator winding 131 is located within the first body portion 1341a, and the first edge portion 1341b is provided radially outward of the first body portion 1341a and includes a protrusion 1341c. In this way, the positional constraints of the second housing 1342 can be applied simultaneously in the axial and radial directions, and the risk of the first housing 1341 and the second housing 1342 separating can be reduced.

[0025] As shown in Figures 5 to 19, the second housing 1342 further includes at least one reinforcing rib 1342e. Furthermore, at least a portion of the reinforcing rib 1342e is located in the position limiting groove 1342g, and at least a portion of the reinforcing rib 1342e is injection molded and fixed to the wall surface corresponding to the position limiting groove 1342g, and the first edge portion 1341b includes at least one engagement groove 1341d. The engagement groove 1341d penetrates the first edge portion 1341b along the axial direction of the electric pump 100, and at least a portion of the reinforcing rib 1342e is located in the engagement groove 1341d, specifically, at least a portion of the reinforcing rib 1342e is fitted into the engagement groove 1341d so as to be injection molded. Specifically, the second housing 1342 includes a plurality of reinforcing ribs 1342e, and the first edge portion 1341b includes a plurality of engagement grooves 1341d. Thus, the reinforcing rib 1342e is positioned within the engagement groove 1341d, reducing the circumferential movement of the second housing 1342. At the same time, the provision of multiple reinforcing ribs 1342e and multiple engagement grooves 1341d improves the connection strength between the second housing 1342 and the first housing 1341, thereby providing a certain basis for reducing the connection strength between the first housing 1341 and the second housing 1342.

[0026] As shown in Figures 5 to 19, the housing 134 includes a first projection 1342f and a first recess 1341f. One of the first projection 1342f and the first recess 1341f is provided in the first housing 1341, and the other is provided in the second housing 1342. The first projection 1342f is located within the first recess 1341f and is fixed and connected so as to be injection molded. In this way, the connection strength between the first housing 1341 and the second housing 1342 can be improved.

[0027] As shown in Figures 1 to 19, the first projection 1342f may be provided on the first housing 1341 or on the second housing 1342, and the first recess 1341f may be provided on the first housing 1341 or on the second housing 1342. As shown in Figures 5 to 19, the first projection 1342f is provided on the second housing 1342, and the engaging portion 1342d includes a position limiting groove 1342g. The first projection 1342f is provided to protrude from the lower surface of the position limiting groove 1342g along the axial direction of the electric pump 100, the first recess 1341f includes a recessed groove 1341e, and the first housing 1341 includes a first main body 1341a and a first edge 1341b. The first edge portion 1341b is provided on the radially outer side of the first main body portion 1341a, and the groove portion 1341e is recessed in the upper surface of the first main body portion 1341a and / or the upper surface of the first edge portion 1341b along the axial direction of the electric pump 100. Here, along the axial direction of the electric pump 100, the upper surface of the first main body portion 1341a is separated from the rotor cavity bottom 1411 relative to the lower surface of the first main body portion 1341a, and the upper surface of the first edge portion 1341b is separated from the rotor cavity bottom 1411 relative to the lower surface of the first edge portion 1341b. In this way, the connection strength between the first housing 1341 and the second housing 1342 is improved, and external moisture can be prevented from entering the stator winding 131 and corroding the stator winding 131.

[0028] As shown in Figures 1 to 19, the second housing 1342 includes a first sealing section, and the pump cover 11 includes a second sealing section. The first sealing section and the second sealing section are sealed and fixed together, and the fixing method includes methods such as welding and bonding. Furthermore, this welding method includes laser welding, friction welding, and ultrasonic welding, and in order to further reduce the manufacturing cost of the electric pump 100, as one implementation, the second housing 1342 further includes a flange portion 1342c, as shown in Figures 1 to 19. Furthermore, along the radially outer side of the electric pump 100, the flange portion 1342c is provided on the radially outer side of the radially extending segment 1342a. The electric pump 100 includes a pump cover 11, the welding portion of the pump cover 11 is located above the flange portion 1342c, and the pump cover 11 and the flange portion 1342c are fixed and connected by welding. In this way, the number of fixing structural components for connecting the pump cover 11 and the stator unit 13, and the sealing structural components at the connection point between the pump cover 11 and the stator unit 13 can be reduced, further lowering the manufacturing cost of the electric pump 100.

[0029] The following describes the connection plate unit 132 in detail.

[0030] As shown in Figures 1 to 4 and Figures 13 to 18, the connecting plate unit 132 is positioned or fixedly connected to the end of the stator winding 131 along the axial direction of the electric pump 100, and is electrically connected to the winding 1313 of the stator winding 131. The first housing 1341 is formed by injection molding with at least the stator winding 131 and the connecting plate unit 132 as inserts, and at least a portion of the connecting plate unit 132 and a portion of the stator winding 131 are located within the first housing 1341. In this way, the electric pump 100 can be made smaller in the radial direction, and the assembly process of the electric pump 100 can be simplified by injection molding the connecting plate unit 132 and the stator winding 131 as inserts. To facilitate subsequent descriptions, the injection molding of the stator winding 131 and connecting plate unit 132 as inserts is defined as the first injection molding, and the injection molding of the first unit 136 and pump shaft 133 as inserts is defined as the second injection molding.

[0031] As shown in Figures 13 to 18, the connecting plate unit 132 includes a position limiting member 1321, a conductive member 1322, and a connector 1323. Furthermore, the position limiting member 1321 and the connector 1323 are injection-molded members, and the conductive member 1322 is a metal member. The conductive member 1322 includes a main body portion 1322a and a pin portion 1322b, which are fixed and connected or connected in such a way that their position is restricted. The main body portion 1322a and the pin portion 1322b may be an integrated structural component or separate structural components, and are fixed and connected by welding, or an electrical connection is made after the main body portion 1322a and the pin portion 1322b are inserted together. The electric pump 100 includes a connecting pin (not shown), and the connecting pin and the conductive member 1322 may be an integrated structure or separate structures. One end of the connecting pin is electrically connected to the wiring end of the stator winding 131, and the other end is fixed and connected to the main body. The connector 1323 is connected to or fixed to the position limiting member 1321 in such a way that its position is restricted. The connector 1323 has an insertion hole 1323a, at least a portion of the main body 1322a is fitted onto the position limiting member 1321, and at least a portion of the pin portion 1322b is located in the insertion hole 1323a. Thus, the connector 1323 may be injection molded in advance. Here, during the first injection molding, the connector 1323 is used as an insert to form the first housing 1341. In this way, the mold structure used during the first injection molding is simplified, laying a certain foundation for reducing the manufacturing cost of the electric pump 100.

[0032] As shown in Figures 1, 13 to 18, the main body 1322a and the pin portion 1322b are separate structures, the connector 1323 is connected to the position limiting member 1321 so as to be position-limited, and the pin portion 1322b includes an electrical connection portion 1322c, a base portion 1322d, and an external power supply connection portion 1322. The electrical connection portion 1322c is connected to the main body portion 1322a in a position-restricted manner, the base portion 1322d is injection-molded and fixed to the connector 1323, the external power connection portion 1322e is connected to an external power source, and at least a portion of the external power connection portion 1322e is located within the insertion hole 1323a. Thus, the unit formed by fixing at least a portion of the pin portion 1322b to the connector 1323 via injection molding is inserted into the conductive member 1322 fitted into the position limiting member 1321 to achieve electrical connection. In this way, the adaptability of the connecting plate unit 132 is improved, meaning that the unit formed by fixing at least a portion of the pin portion 1322b to the connector 1323 via injection molding can be applied to electric pumps of different models, and furthermore, the manufacturing cost of the electric pump can be reduced.

[0033] To reduce deformation of the connecting plate unit 132 during injection molding, as shown in Figures 1, 13 to 18, in one implementation, the insertion hole 1323a penetrates the connector 1323 along a direction parallel to the axial direction of the electric pump 100, and the insertion hole 1323a includes a first opening 1323b and a second opening 1323c. The first opening 1323b is closer to the position limiting member 1321 than the second opening 1323c, and the connecting plate unit 132 includes a pressure relief hole 1324, which penetrates the position limiting member 1321 in a direction parallel to the thickness direction of the position limiting member 1321, where the thickness direction of the position limiting member 1321 is parallel to the axial direction of the electric pump 100. Along the direction parallel to the axial direction of the electric pump 100, the wall portion corresponding to the first opening 1323b and the wall portion corresponding to the pressure relief hole 1324 are projected onto the upper surface of the position limiting member 1321, and the projection of the wall portion corresponding to the pressure relief hole 1324 is located within the projection of the wall portion corresponding to the first opening 1323b. The connector 1323 is fixedly connected to or positioned to the position limiting member 1321, the first opening 1323b is located above the position limiting member 1321, and during the first injection molding, the position limiting member 1321 corresponding to the first opening 1323b is deformed by the action of the injection molding pressure. Thus, the position limiting member 1321 corresponding to the first hole 1323b is provided with a pressure relief hole 1324, and during the first injection molding, at least a portion of the injection molding pressure is released through the pressure relief hole 1324. In this way, deformation of the connecting plate unit 132 is reduced during the first injection molding, and the situation in which the electrical connection of the electric pump 100 becomes invalid is reduced.

[0034] As an alternative embodiment, as shown in Figures 1, 13 to 18, the insertion hole 1323 penetrates the connector 1323 in a direction parallel to the axial direction of the electric pump 100, the insertion hole 1323 includes a first opening 1323b and a second opening 1323c, the first opening 1323b approaches the position limiting member 1321 relative to the second opening 1323c, and the connector 1323 further includes a plate portion 1323d. Furthermore, at least a portion of the plate portion 1323d is located at the first opening 1323b, the plate portion 1323d has at least one perforated portion 1323e, and at least a portion of the outer wall of the plate portion 1323d is injection molded and fixed to the wall portion corresponding to the first opening 1323b. By positioning the plate portion 1323d, the strength of the connector 1323 is improved, deformation of the connecting plate unit 132 is reduced when it is injection molded as an insert, and the situation in which the electrical connection of the electric pump 100 becomes invalid is reduced.

[0035] Hereinafter, the above embodiments are not intended to limit the present invention, but are merely used to illustrate the present invention. This specification has described the present invention in detail with reference to the above embodiments, but any amendments or equivalent substitutions may be made to the present invention, and any improvements that do not depart from the spirit and scope of the invention should fall within the scope of the claims of this application. [Explanation of symbols]

[0036] 100... Electric pump 11... Pump cover 12 ··· Rotating Unit 121 ···Blade Unit 122 ···Rotor Unit 13 ···Stator Unit 131 ···Stator winding 1311 ··· Stator Core 1312 ···Insulating frame 1313 ···winding 132 ···Connecting plate unit 1321 ···Position limiting member 1322 ···Conductive component 1322a...Main body 1322b ···Pin part 1322c ···Electrical connection 1322d...Base 1322e ···External power connection section 1323 ··· Connector 1323a ···Insertion hole 1323b...1st hole 1323c...Second hole 1323d ···Plate part 1323e ···Watermark 1324 ···Pressure relief hole 133... Pump shaft 1331...Fixed part 1332 ···Rotating part 134 ···Housing 1341 ···First Housing 1341a...1st body part 1341b ···First edge section 1341c ···Convex part 1341d...Engagement groove 1341e...concave groove 1342 ···Second Housing 1342a ···Radially extending segment 1342b...Cylinder part 1342c ···Flange section 1342d...Engagement part 1342e ···Reinforcement ribs 1342f...1st protrusion 1342g ·· Position limiting groove 1342h ···Interior wall surface 1342r...Outer wall surface 1411 ···Bottom of the rotor cavity 1412 ···Rotor cavity side 136 ···Unit 1 1362 ···First Cavity 1362a...bottom 1362b ···Side 141 ···Rotatum Cavity 15... Blade cavity 20 ···Pump Cavity

Claims

1. An electric pump (100), Including the stator winding (131) and the housing (134), The housing (134) includes a first housing (1341) and a second housing (1342), At least a portion of the first housing (1341) is formed to be injection molded with the stator winding (131) as an insert, The first unit (136) is defined to include the first housing (1341) and the stator winding (131), At least a portion of the second housing (1342) is formed to be injection molded with the first unit (136) as an insert, The housing (134) includes a protrusion (1341c) and an engaging portion (1342d), One of the two protrusions (1341c) and the engaging portion (1342d) is provided on the first housing (1341), and the other is provided on the second housing (1342). The electric pump (100) is characterized in that the protrusion (1341c) and the engaging portion (1342d) are engaged such that their position is restricted along the axial direction of the electric pump (100).

2. The second housing (1342) includes a cylindrical portion (1342b) and a radially extending segment (1342a), The radially extending segment (1342a) is provided radially outward of the cylindrical portion (1342b) along the radial direction of the electric pump (100), The second housing (1342) further includes a flange portion (1342c), The flange portion (1342c) is provided radially outward of the radially extending segment (1342a) along the radially outward side of the electric pump (100), The engagement portion (1342d) is provided on the second housing (1342), The flange portion (1342c) includes an inner wall surface (1342h) and an outer wall surface (1342r), The inner wall surface (1342h) approaches the cylindrical portion (1342d) relative to the outer wall surface (1342r) along the radial direction of the electric pump (100), The engagement portion (1342d) includes a position limiting groove (1342g), The position limiting groove (1342g) is recessed relative to the inner wall surface (1342h), The position limiting groove (1342g) is provided with a position limiting groove bottom, The first housing (1341) includes a first main body portion (1341a) and a first edge portion (1341b), The first edge portion (1341b) is provided on the radially outer side of the first main body portion (1341a), The electric pump (100) according to claim 1, characterized in that the first edge portion (1341b) includes the convex portion (1341c).

3. The second housing (1342) further includes at least one reinforcing rib (1342e), At least a portion of the reinforcing rib (1342e) is located in the position limiting groove (1342g), At least a portion of the reinforcing rib (1342e) and the wall surface corresponding to the position limiting groove (1342g) are integrally structured. The first edge portion (1341b) includes at least one engagement groove (1341d), The engagement groove (1341d) penetrates the first edge portion (1341b) along the axial direction of the electric pump (100), At least a portion of the reinforcing rib (1342e) is located in the engagement groove (1341d), The electric pump (100) according to claim 2, characterized in that the reinforcing rib (1342e) and the engagement groove (1341d) are fixed and connected so as to be injection molded.

4. The housing (134) includes a first projection (1342f) and a first recess (1341f), One of the first projection (1342f) and the first recess (1341f) is provided in the first housing (1341), and the other is provided in the second housing (1342). The electric pump (100) according to any one of claims 1 to 3, characterized in that the first projection (1342f) is located within the first recess (1341f), and the first projection (1342f) and the first recess (1341f) are fixedly connected so as to be injection molded.

5. The first projection (1342f) is provided on the second housing (1342), The engagement portion (1342d) includes a position limiting groove (1342g), The first projection (1342f) is provided so as to protrude from the lower surface of the position limiting groove (1342g) along the axial direction of the electric pump (100), The first recess (1341f) includes a groove (1341e), The first housing (1341) includes a first main body portion (1341a) and a first edge portion (1341b), The first edge portion (1341b) is provided on the radially outer side of the first main body portion (1341a), The electric pump (100) according to claim 4, characterized in that the groove portion (1341e) is recessed in the upper surface of the first main body portion (1341a) and / or the upper surface of the first edge portion (1341b) along the axial direction of the electric pump (100).

6. The electric pump (100) includes a pump cavity (20), The second housing (1342) includes a rotor cavity side portion (1412), A working medium can flow through the pump cavity (20). The wall portion corresponding to the pump cavity (20) includes the rotor cavity side portion (1412), The electric pump (100) according to claim 1, characterized in that at least a portion of the rotor cavity side portion (1412) is made of a different material from the material of the first housing (1341).

7. The second housing (1342) includes the rotor cavity bottom (1411), The rotor cavity bottom (1411) is sealed and connected to one end of the rotor cavity side (1412), The wall portion corresponding to the pump cavity (20) includes the rotor cavity bottom portion (1411), The electric pump (100) according to claim 6, characterized in that at least a portion of one of the rotor cavity bottom (1411) and the rotor cavity side (1412) is made of a different material from the material of the first housing (1341).

8. The electric pump includes a pump shaft (133), The second housing (1342) is formed by injection molding with the first unit (136) and the pump shaft (133) as inserts. The pump shaft (133) includes a fixing portion (1331) that is fitted into the bottom of the rotor cavity (1411), The electric pump (100) according to claim 7, characterized in that a part of the rotor cavity bottom (1411) encloses the end of the fixing part (1331).

9. The pump cavity (20) includes a rotor cavity (141), The electric pump (100) includes a rotor unit (122), At least a portion of the rotor unit (122) is located in the rotor cavity (141), The wall portion corresponding to the rotor cavity (141) includes the rotor cavity bottom portion (1411) and the rotor cavity side portion (1412), The electric pump (100) according to claim 7 or 8, characterized in that the material of the rotor cavity bottom (1411) and the rotor cavity side (1412) are both different from the material of the first housing (1341).

10. The hydrolysis resistance of the material of the first housing (1341) is lower than that of the polyphenylene sulfide material. The electric pump (100) according to any one of claims 6 to 9, characterized in that the hydrolysis resistance of the material of the second housing (1342) is greater than or equal to that of the polyphenylene sulfide material.

11. The second housing (1342) includes a cylindrical portion (1342b) and a radially extending segment (1342a), The radially extending segment (1342a) is provided radially outward of the cylindrical portion (1342b) along the radial direction of the electric pump (100), The electric pump (100) includes a pump cavity (20), and when the electric pump (100) is operating, a working medium can flow through the pump cavity (20). The wall portion corresponding to the pump cavity (20) includes the cylindrical portion (1342b) and the radially extending segment (1342a), The electric pump (100) according to any one of claims 1 to 10, characterized in that the material of the first housing (1341) is different from the material of the second housing (1342).

12. The electric pump includes a pump shaft (133), At least a portion of the second housing (1342) is formed to be injection molded with the pump shaft (133) and the first unit (136) as inserts, The cylindrical portion (1342b) includes a rotor cavity bottom portion (1411) and a rotor cavity side portion (1412), The rotor cavity bottom (1411) and the rotor cavity side (1412) are sealed and connected by injection molding. The rotor cavity bottom (1411) is located at one end of the rotor cavity side (1412), The pump shaft (133) includes a fixing portion (1331) that is fitted into the bottom of the rotor cavity (1411), The electric pump (100) according to any one of claims 2 to 11, characterized in that a part of the rotor cavity bottom (1411) encloses the end of the fixing part (1331).

13. The first unit (136) comprises a first cavity (1362), The wall portion corresponding to the first cavity (1362) includes a bottom portion (1362a) and a side portion (1362b), The bottom portion (1362a) is provided at one end of the side portion (1362b), The second housing (1342) includes a rotor cavity bottom (1411) and a rotor cavity side (1412), The rotor cavity bottom (1411) and the rotor cavity side (1412) are sealed and connected by injection molding. The rotor cavity bottom (1411) is positioned above the bottom (1362a) of the first cavity (1362) and is arranged to contact the bottom (1362a) of the first cavity (1362). The rotor cavity bottom (1411) covers the bottom (1362a) of the first cavity (1362) in the radial direction of the electric pump (100). The rotor cavity side portion (1412) is positioned radially inward of the side portion (1362b) of the first cavity (1362) and is arranged to contact the side portion (1362b) of the first cavity (1362). The electric pump according to any one of claims 1 to 12, characterized in that the rotor cavity side portion (1412) covers the side portion (1362b) of the first cavity (1362) along the circumferential direction of the side portion (1362b) of the first cavity (1362).

14. The electric pump according to claim 13, characterized in that the inner wall surface of the side portion (1362b) includes the inner wall surface of the stator core (1311) and the inner wall surface of the first housing (1341).

15. The electric pump (100) further includes a connecting plate unit (132), The connecting plate unit (132) and the stator winding (131) are positioned or fixed and connected so as to be restricted in position along the axial direction of the electric pump (100). The connecting plate unit (132) and the stator winding (131) are electrically connected. The first housing (1341) is formed by injection molding with at least the stator winding (131) and the connecting plate unit (132) as inserts, The electric pump (100) according to any one of claims 1 to 14, characterized in that at least a portion of the connecting plate unit (132) and a portion of the stator winding (131) are located within the first housing (1341).

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