CN116255341A

CN116255341A - Electric pump and method for assembling electric pump

Info

Publication number: CN116255341A
Application number: CN202111506617.7A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2023-06-13

Abstract

According to the electric pump and the assembly method of the electric pump, the injection molding body is formed by taking the stator assembly and the contact pin as inserts, the rotor cavity is formed, the rotor assembly is fixedly connected with the pump cover after being arranged in the rotor cavity, the assembly method of the electric pump is relatively simple, and the formed electric pump is relatively simple in structure.

Description

Electric pump and method for assembling electric pump

Technical Field

The invention relates to a fluid pump, in particular to an electric pump.

Background

The electric pump comprises a stator assembly, a pump housing and a contact pin, wherein the contact pin is used for being connected with the outside, so that energy or driving signals or control signals are provided for the electric pump, the pump housing comprises a plurality of sub-components, the sub-components are required to be connected and sealed, the structure of the electric pump is relatively complex, and the electric pump with a simple structure is also relatively complex to assemble and is a technical problem.

Disclosure of Invention

The present application provides an electric pump and an assembling method thereof, which are beneficial to simplifying the electric pump and the assembling method thereof.

In order to achieve the above object, an embodiment of the present application adopts the following technical scheme: the utility model provides an electric pump, includes rotor subassembly, stator subassembly, contact pin and injection molding body, stator subassembly's wire winding with the contact pin is fixed and the electricity is connected, the injection molding body at least with stator subassembly and contact pin are inserts injection molding, the cladding of injection molding body stator subassembly, the contact pin with the injection molding body is moulded plastics fixedly, the electric pump has the rotor chamber, forms the wall in rotor chamber includes the inner wall of injection molding body, at least part rotor subassembly is located the rotor chamber, the electric pump includes the joint portion, the joint portion with the integrative structure of injection molding body or the fixed of moulding plastics, the needle portion of contact pin is located the holding chamber of joint portion.

Another embodiment of the present application also provides an assembly method of an electric pump, applied to an electric pump, the electric pump including a stator assembly, a pin, a rotor assembly, and a pump housing, the pump housing including an injection molding body and a pump cover, the electric pump assembly method including:

forming the injection molding body by taking the stator assembly and the contact pin as inserts;

placing the rotor assembly in a rotor cavity of the injection body;

the pump cover is fixedly connected with the injection molding body.

Drawings

FIG. 1 is a schematic cross-sectional view of a first embodiment of an electric pump of the present invention;

FIG. 2 is a schematic illustration of an exploded construction of the electric pump of FIG. 1;

FIG. 3 is a schematic front view of the motor of FIG. 1;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic structural view of a view of the first housing;

FIG. 6 is a schematic structural view of another view of the first housing;

FIG. 7 is a schematic perspective view of a stator assembly;

FIG. 8 is a schematic structural view of a stator assembly in combination with an inner housing from one perspective;

FIG. 9 is a schematic structural view of another perspective of the stator assembly in combination with the inner housing;

FIG. 10 is a schematic perspective view of a pin;

FIG. 11 is a schematic view of the mating of the first housing, pins, and windings;

FIG. 12 is a schematic cross-sectional view of a second embodiment of the electric pump of the present invention;

FIG. 13 is a schematic view of the structure of FIG. 12 with the second housing removed;

fig. 14 is a schematic view of the structure of the removed joint of fig. 13.

Detailed Description

The invention is further described with reference to the drawings and the specific embodiments below:

the electric pump in the following embodiments can provide flowing power for the working medium of the automobile thermal management system, and the working medium can be a 50% glycol aqueous solution or clear water, and of course, the working medium can also be other substances.

Referring to fig. 1-4, the electric pump 1000 includes a pump housing 1100, a rotor assembly 1200, a stator assembly 1300, and a pump shaft 16, at least a portion of the rotor assembly 1200 is sleeved on the periphery of the pump shaft 16, and the rotor assembly 1200 is rotationally connected with the pump shaft 16; the pump housing 1100 is capable of forming a pump cavity 1010, the rotor assembly 1200 being located in the pump cavity 1010, the pump cavity 1010 including a rotor cavity 1011 and an impeller cavity 1012, the rotor cavity 1011 and the impeller cavity 1012 being in communication; the rotor assembly 1200 includes a rotor 1220 and an impeller 1210, in this embodiment, the rotor 1220 includes permanent magnets, wherein at least a portion of the rotor 1220 is located in the rotor cavity 1011 and the impeller 1210 is located in the impeller cavity 1012. In operation of the electric pump 1000, the rotor assembly 1200 rotates about the pump shaft 16 under the influence of the excitation magnetic field generated by the stator assembly 1300 by controlling the current of the stator assembly 1300 and thus the excitation magnetic field generated by the stator assembly 1300.

Referring to fig. 7, the stator assembly 1300 includes a stator core 1310, an insulating frame 1320 and windings 1330, the number of windings 1330 is at least three, the insulating frame 1320 is wrapped on at least part of the surface of the stator core 1310, the windings 1330 are wound on the insulating frame 1320, in a specific embodiment, the stator assembly 1300 includes nine windings 1330, and of course, the stator assembly 13002 may include other numbers of windings 1330, such as three, six, twelve, or other numbers. Referring to fig. 4, 7, 8 and 9, in the present embodiment, a first assembly is defined, the first assembly includes a stator core 1310, an insulation frame 1320 and a winding 1330, the insulation frame 1320 is coated on at least a portion of a surface of the stator core 1310, and a winding wire of the winding 1330 is wound on the insulation frame 1320. The stator assembly includes an inner housing 100, the inner housing 100 is formed by insert molding at least with a first assembly body, the inner housing 100 covers a stator core 1310, an insulation frame 1320, and a winding 1330 wound around the insulation frame 1320, and the inner housing 100 is a molded body. The inner housing 100 has a rotor cavity 1011 or, alternatively, the walls forming the rotor cavity 1011 comprise the walls of the inner housing 100 or the inner housing 100 separates the first assembly from the rotor cavity 1011, effecting separation of the fluid within the rotor cavity 1011 from the first assembly. Of course, the pump shaft 16 may be fixed with the inner housing 100 by injection molding, or alternatively, the inner housing 100 may be formed by injection molding the first assembly and the pump shaft 16 as an insert, the inner housing 100 has an assembly hole for accommodating a portion of the pump shaft 16, where the pump shaft 16 is fixed with the inner housing 100 by injection molding, and the assembly hole of the pump shaft 16 may be a through hole or a blind hole, in this embodiment, the pump shaft 16 includes a first fixing section 161 fixed with the inner housing 100, a second fixing section 162 protruding from the pump housing 1100, and a first end fixed with the rotor assembly 1200, and accordingly, the inner housing 100 has a first assembly hole 110 for accommodating the first fixing section 161, and the first fixing section 161 is fixed with the inner housing 100 by injection molding. The first end includes a distance extending inward from the end surface, and the "injection molding" may be one-time injection molding, two-time injection molding or more than two-time injection molding, so that a set of molds can realize the inner housing 100, thereby saving cost.

Referring to fig. 7 to 8, the electric pump 1000 further includes a conductive member 1500, where the conductive member 1500 includes a first connection section 1510 and a second connection section 1520, the second connection section 1520 is needle-shaped, and the second connection section 1520 is used for being connected to the outside, in this embodiment, the first connection section 1510 of the conductive member 1500 contacts the stator core 1310 for grounding the stator assembly 1300, thereby being beneficial to reducing the influence of accumulated charges on the electric pump 1000 and improving the electromagnetic compatibility of the electric pump 1000. Referring to fig. 7, in this embodiment, the conductive member 1500 is a single piece, and of course, the conductive member 1500 may also include two or more components. The conductive member 1500 includes a first injection molding segment 1540, the first injection molding segment 1540 is connected to the first connection segment 1510, the inner housing 100 has a first injection molding hole through which the first injection molding segment 1540 passes, the first injection molding hole is formed with the first injection molding segment 1540 as an insert, the first connection segment 1510 of the conductive member 1500 is located in the inner housing 100, and a portion of the conductive member 1500, such as the second connection segment 1520, is exposed outside the inner housing 100. The conductive member 1500 further includes a connection portion 1530, the connection portion 1530 being located at a different side of the inner housing 100 in the axial direction of the electric pump 1000, the connection portion 1530 being connected to the first injection molding section 1540, the connection portion 1530 extending in a direction perpendicular to the axial direction of the electric pump 1000, the conductive member 1500 being provided with the connection portion 1530 for changing the protruding position of the second connection section 1520, in the present embodiment, the second connection section 1520 being closer to the pump shaft 16 than the first connection section 1510 in the radial direction of the electric pump 1000.

Referring to fig. 7, the winding wire of the winding 1330 includes a first section 1331, a second section 1332 and a third section 1333, wherein the second section 1332 is located between the first section 1331 and the third section 1333, the first section 1331 is wound on the insulating frame 1320, the inner housing 100 has a second injection hole formed by using the winding wire of the winding 1330 as an insert, or the winding wire is one of inserts formed in the inner housing 100 by injection molding, the inner housing 100 has a second injection hole for the winding wire to extend out of the inner housing 100, and the second section 1332 and the third section 1333 of the winding wire are exposed to the inner housing 100, or the winding wire has a portion extending out of the inner housing 100.

Please refer to fig. 2, 11 and 4. The electric pump 1000 further includes a first housing 200 and a pin 1400, the first housing 200 is fixedly connected with the stator assembly 1300, specifically, the first housing 200 is fixedly connected with the stator assembly 1300 through the inner housing 100, the first housing 200 is fixedly connected with the pin 1400, the first housing 200 has a winding hole 240, a second section 1332 of the winding is located in the winding hole 240, a third section 1333 is exposed to the first housing 200, a connection section of the third section 1333 is fixedly and electrically connected with a hanging wire portion 1430 of the pin 1400, and the stator core 1310 and the hanging wire portion 1430 of the pin 1400 are located on different sides of the first housing 200. Thus, the winding wire of the winding 1330 passes through the first housing 200 and is further fixed and electrically connected with the wire hanging portion 1430 of the pin 1400, and the pin 1400 is fixedly connected with the first housing 200, so that the connection between the winding wire of the winding 1330 and the pin 1400 can be simplified, the assembly is convenient, and the structure of the electric pump 1000 is also facilitated to be simplified.

In a specific embodiment, referring to fig. 6, 8 and 11, the first housing 200 has a winding hole 240, the second section 1332 of the winding is located in the winding hole 240, the third section 1333 of the winding is exposed to the first housing 200, the first housing 200 is injection-molded and fixed with the stator assembly 1300, specifically, the first housing 200 is injection-molded and fixed with the inner housing 100 and then injection-molded and fixed with the stator assembly 1300, the second section 1332 of the winding is injection-molded and fixed with the first housing 200, and the winding hole 240 is injection-molded and molded with the second section 1332 of the winding as an insert. The conductive member 1500 includes a second injection molding section 1550, the first housing 200 has a conductive hole 280 through which the second injection molding section 1550 passes, and since the connection portion 1530 protrudes from the inner housing 100, the first housing 200 is formed with a receiving groove 260 receiving the connection portion 1530 during injection molding; in addition, since the extension direction of the connection part 1530 is perpendicular to the axial direction of the electric pump 1000, in order to prevent the connection part 1530 from moving during injection molding, the connection part 1530 is compressed by a second tool, which is an insert during injection molding to form the first housing 200, and after the injection molding of the first housing 200 is completed, the first housing 200 has a second receiving hole 250 for receiving the second tool. Since the second fixing section 162 of the pump shaft protrudes out of the inner housing 100, the first housing 200 is injection molded with the pump shaft 16 as an insert, the second fixing section 162 is injection molded with the first housing 200, and the first housing 200 has a second assembly hole 270 for accommodating the second fixing section 162. Thus, the second fixing section 162 of the pump shaft 16 is injection-fixed with the first casing 200, and the casing 100 in the first fixing section 161 of the pump shaft 16 is injection-fixed, which is beneficial to enhancing the fixing strength of the pump shaft 16 and the pump casing 1100.

Referring to fig. 1-4 and 8, the pump housing 1100 further includes a pump cover 1110, where the pump cover 1110 is sealed and fixed with the first housing 200, the pump cover 1110 has an impeller cavity 1012, an inlet and an outlet, the inlet and the outlet are respectively communicated with the impeller cavity 1012, the impeller 1210 is located in the impeller cavity 1012, in this embodiment, along the axial direction of the electric pump 1000, the outer side wall of the inner housing 100 includes a first side wall 120 and a second side wall 130, and the first side wall 120 is embedded into the first housing 200 when injection molding, or the first side wall 120 is wrapped in the first housing 200, and the second side wall 130 is located in the impeller cavity 1012. The first housing 200 includes a bottom 210 and a side 220, wherein the bottom 210 of the first housing 200 has a winding hole 240, a pin hole 230, and a third injection hole for a conductive member to pass through, the side 220 extends from the bottom 210 toward the pump cover 1110 in the axial direction of the electric pump 1000, the side 220 surrounds the first sidewall 110 of the stator assembly 1300, and the side 220 is in sealing connection with the first sidewall 110 of the stator assembly 1300. The first housing 200 further includes a first sealing portion, the pump cover 1110 includes a second sealing portion, and the first sealing portion and the second sealing portion are sealed and fixed, and the fixing manner includes welding, bonding, and the like, and the welding manner includes laser welding, friction welding, and ultrasonic welding, which are not described in detail; alternatively, the electric pump 1000 includes a seal member that abuts against the first seal portion and the second seal portion, respectively, and the pump cover 1110 is fixedly connected to the first housing 200 by bolts. This helps prevent leakage of fluid within the pump lumen 1010. In order to enhance the sealing, further, at least one of the first housing 200 and the first side wall 110 is provided with a plurality of concave portions, the extending direction of the concave portions intersects with the axial direction of the electric pump 1000, preferably, the extending direction of the concave portions is perpendicular to the axial direction of the electric pump 1000, and it can be known that when the first housing 200 is injection-molded with the inner housing 100, the other of the first housing 200 and the first side wall 110 is a convex portion, and these convex portions and concave portions cooperate with each other, so that not only the sealing performance between the inner housing 100 and the first housing 200, but also the fixing strength between the inner housing 100 and the first housing 200 can be enhanced.

The first housing 200 further includes a mounting portion 201, and the mounting portion 201 is used for mounting the electric pump 1000, specifically, the mounting portion 201 has a plurality of holes, which may be threaded holes or through holes, and will not be described in detail.

Referring to fig. 2, 10 and 11, the pin 1400 includes a fixing portion 1410, a hanging portion 1430 and a needle portion 1420, the hanging portion 1430 is located between the needle portion 1420 and the fixing portion 1410 along the axial direction of the electric pump 1000, the fixing portion 1410 of the pin 1400 is closer to the stator core 1310 than the hanging portion 1430 of the pin 1400, and the fixing portion 1410, the hanging portion 1430 and the needle portion 1420 may be integrally or separately fixed by welding. The first housing 200 has a pin hole 230, the pin hole 230 can be injection molded by using the first tool as an insert when the first housing 200 is injection molded, the pin hole 230 can also be formed by machining, the pin hole 230 can penetrate through the first housing 200, the pin hole can also be a blind hole, a fixing portion 1410 of the pin 1400 is positioned at the pin hole 230, an opening of the pin hole 230 faces away from the stator core 1310, the pin 1400 can be in interference fit with a hole wall of the pin hole 230, the pin 1400 can also be adhered and fixed to the first housing 200, and the pin 1400 and the first housing 200 are fixed, so that damage of the electric pump 1000 during molding can be reduced, such as winding breakage can be prevented, and positioning of the pin 1400 can also be facilitated. In a specific embodiment, fixing portion 1410 of pin 1400 includes a tooth 1411 and a protrusion 1412, wherein protrusion 1412 protrudes with respect to tooth 1411, in the axial direction of electric pump 1000, protrusion 1412 is closer to stator core 1310 than tooth 1411, tooth 1411 is located at pin hole 230, part of protrusion 1412 is located at pin hole 230, and protrusion 1412 has a limiting effect on pin 1400. The hanging wire portion 1430 includes an extension portion 1431 and a bending portion 1432, the extension portion 1431 connects the fixing portion 1410 and the needle portion 1420, the bending portion 1432 is bent relative to the extension portion 1431, a space for accommodating a third section 1333 of the portion is provided between the bending portion 1432 and the extension portion 1431, and the connecting end hanging wire portion 1430 of the third section 1333 is fixed and electrically connected. In a more specific embodiment, the winding hole 240 penetrates the first housing 200 along the axial direction of the electric pump 1000, the stator core 1310 and the hanging wire portion 1430 of the pin 1400 are located at opposite sides of the first housing 200, the pin portion 1420 includes a vertical section 1421, and the extending direction of the vertical section 1421 is parallel to the axial direction of the electric pump 1000, so that the radial dimension of the electric pump 1000 can be reduced compared to the direction of the pin portion 1420 perpendicular to the axial direction of the electric pump 1000 or at other angles. In addition, referring to fig. 12 and 13, the needle portion 1420 may further include a vertical section 1421 and a horizontal section 1422, where the extending direction of the vertical section 1421 is parallel to the axial direction of the electric pump 1000, the extending direction of the horizontal section 1422 is perpendicular to the axial direction of the electric pump 1000, and the vertical section 1421 is closer to the hanging line portion 1430 than the horizontal section 1422 along the axial direction of the electric pump 1000, so that the direction of the joint portion 400 of the electric pump 1000 can be adjusted according to actual needs, which is convenient for installation and also improves the applicability of the electric pump 1000.

Referring to fig. 2, 12 and 13, the electric pump 1000 includes a second housing 300, the second housing 300 is formed by insert molding at least with the pin 1400 and the conductive member 1500, a third section 1333 of the winding is also located in the second housing 300, the second housing 300 is fixed with the pin 1400 and the first housing 200 by injection molding, and it can be known that the second housing 300 is fixedly connected with the first housing 200 by injection molding; the second housing 300 includes a connector portion 400, the connector portion 400 is used for being connected with the outside, the connector portion 400 has a receiving cavity 410, and at least part of the needle portion 1420 and at least part of the second connecting section 1520 are located in the receiving cavity 410. In a specific embodiment, the pin 1400 includes only the vertical section 1421, and the joint portion 400 is formed by injection molding, but of course, the joint portion 400 may also be an insert, and in injection molding, the joint portion 400 is an insert, and the second housing 300 is injection molded with the joint portion 400, the pin 1400, and the conductive member 1500. In another specific embodiment, the pin 1400 includes a vertical section 1421 and a horizontal section 1422, where the joint 400 is in a split structure with the second housing 300, the joint 400 is an insert, and the joint 400 is injection-molded and fixed with the second housing 300.

In the above embodiment, the inner housing 100 is injection molded with the first assembly body as an insert, the first assembly body is injection fixed with the inner housing 100, the first housing 200 is injection fixed with the inner housing 100, and the third section 1333 of the second housing 300 with the winding wire and the conductive member 1500 are injection molded as an insert. In still another embodiment of the electric pump 1000, the pump housing 1100 may not include the first housing 200, the pin hole 230 may be formed when the inner housing 100 is injection molded, the pin 1400 may be fixed to the inner housing 100, and the second housing 300 may be injection molded with the pin 1400 and the conductive member 1500 as inserts, which will not be described in detail.

It will be appreciated that the pump housing 1100 includes a pump cover 1110, a first housing 200, and a second housing 300, the stator assembly includes an inner housing 100, wherein the inner housing 100, the first housing 200, and the second housing 300 are injection molded, and the inner housing 100, the first housing 200, and the second housing 300 are defined as injection molded bodies, such that the electric pump 1000 includes a rotor assembly 1200, a stator assembly 1300, a pin 1400, and injection molded bodies, which are injection molded with at least the stator assembly 1300 and the pin 1400 as inserts, the injection molded bodies cover the stator assembly 1300, the electric pump 1000 has a rotor cavity 1011, walls forming the rotor cavity 1011 include inner walls of the injection molded bodies, at least a portion of the rotor assembly 1200 is located in the rotor cavity 1011, the electric pump 1000 includes a joint portion 400, the joint portion 400 is integrally structured with the injection molded bodies or injection molded fixed, and a pin portion 1420 of the pin 1400 is located in a receiving cavity 410 of the joint portion 400. The injection molded body may be formed by one injection molding, or may be formed by two or more injection molding, for example, in this embodiment, the injection molded body is formed by three injection molding, the inner housing 100 is formed by a first injection molding, which is defined as a first injection molded body, the first housing 200 is formed by a second injection molding, which is defined as a second injection molded body, and the second housing 300 is formed by a third injection molding, which is defined as a third injection molded body. The stator assembly 1300 and the contact pin 1400 are fixed through injection molding, the pump cover 1110 is fixed with the injection molding body in a sealing way, one part of the rotor assembly 1200 is positioned in the injection molding body, and the other part of the rotor assembly 1200 is positioned in the pump cover 1110, so that the electric pump 1000 has a simple structure and relatively simplified assembly. The injection molded body may be injection molded twice, and the first housing 200 may not be required, and only the inner housing 100 and the second housing 300 may be injection molded separately, which will not be described in detail.

In another embodiment, the first housing 200 may be fixed to the inner housing 100 after injection molding, and the fixing manner may be adhesive or by bolting, which will not be described in detail.

One embodiment of the present application also provides an electric pump 1000 assembling method applied to the electric pump 1000, the electric pump 1000 including a stator assembly 1300, a pin 1400, a rotor assembly 1200 and a pump housing 1100, the pump housing 1100 including an injection molding body and a pump cover 1110, the electric pump 1000 assembling method including:

forming an injection molded body with the stator assembly 1300 and the pins 1400 as inserts;

placing the rotor assembly 1200 into a rotor cavity 1011 of the injection molded body;

fixedly connects the pump cover 1110 and the injection molded body.

The injection molding body is formed by taking the stator assembly 1300 and the contact pin 1400 as inserts, and simultaneously forms the rotor cavity 1011, and the rotor assembly 1200 is fixedly connected with the pump cover 1110 after being placed in the rotor cavity 1011, so that the assembly method of the electric pump 1000 is relatively simple, and the structure of the formed electric pump 1000 is relatively simple.

In this embodiment, the injection molding body includes a first injection molding body, a second injection molding body, and a third injection molding body, and forming the injection molding body with the stator assembly 1300 and the pin 1400 as inserts includes at least:

the stator assembly 1300 is used as an insert for injection molding to form a first injection molding body; alternatively, the stator assembly 1300 and the pump shaft 16 are used as insert injection molding to form a first injection molding body; alternatively, the electric pump 1000 includes a conductive member 1500, wherein the first connection section 1510 of the conductive member 1500 contacts the stator core 1310, and the stator assembly 1300, the pump shaft 16, and the conductive member 1500 are injection molded to form a first injection molded body;

forming a second injection molding body by injection molding; specifically, the second injection molded body is formed with the wire winding and the conductive member 1500 as an insert; thus, the second injection molded body has a winding hole 240 through which the winding wire passes, and the second injection molded body has a third injection molded hole through which the conductive member 1500 passes; where the pump shaft 16 has a portion that protrudes from the first injection molded body, the protruding portion of the pump shaft 16 is also an insert that forms the second injection molded body;

further, the injection molding to form the second injection molded body further includes: forming pin holes 230 by using the first tool as an insert, and forming second accommodating holes 250 by using the second tool as an insert; the second tool is used for limiting the connection part 1530 of the conducting piece 1500, and preventing the connection part 1530 from moving during injection molding of the first housing 200.

The second injection molding body and the first injection molding body can be fixed during injection molding; the second injection-molded body may be formed first and then fixedly connected to the first injection-molded body by welding, bonding or bolting.

Injection molding a third injection molded body, specifically, insert molding the pin 1400 and the conductive member 1500;

before injection molding the third injection molded body, the method of assembling the electric pump 1000 includes: pin 1400 is fixed to pin hole 230, and the wire is fixed to wire hanging portion 1430 of pin 1400.

Where pin 1400 includes vertical section 1421, injection molding the second injection molded body includes injection molding joint 400.

Where pin 1400 includes vertical sections 1421 and horizontal sections 1422, the method of assembling electric pump 1000 further includes: forming a joint 400;

the injection molding of the second injection molded body includes: the second injection molded body is formed by insert molding the joint 400, the pin 1400, and the conductor 1500.

It should be noted that: the above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention may be modified or substituted by the same, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention are intended to be included in the scope of the claims of the present invention.

Claims

1. The utility model provides an electric pump, includes rotor subassembly, stator subassembly, contact pin and injection molding body, stator subassembly's wire winding with the contact pin is fixed and the electricity is connected, the injection molding body at least with stator subassembly and contact pin are inserts injection molding, the cladding of injection molding body stator subassembly, the contact pin with the injection molding body is moulded plastics fixedly, the electric pump has the rotor chamber, forms the wall in rotor chamber includes the inner wall of injection molding body, at least part rotor subassembly is located the rotor chamber, the electric pump includes the joint portion, the joint portion with the integrative structure of injection molding body or the fixed of moulding plastics, the needle portion of contact pin is located the holding chamber of joint portion.

2. The electric pump of claim 1, comprising a pump cap having an inlet, an outlet, and an impeller cavity, the impeller cavity in communication with the rotor cavity, the rotor assembly comprising an impeller fixedly or limitedly connected to the rotor, at least a portion of the impeller being located in the impeller cavity, the rotor being located in the rotor cavity, the rotor cavity in communication with the impeller cavity;

the electric pump comprises a sealing piece, the sealing piece is respectively abutted to the pump cover and the injection molding body, and the pump cover is fixedly connected with the injection molding body;

or the pump cover and the injection molding body are welded and sealed.

3. The electric pump of claim 2, including a pump shaft, one end of the pump shaft being injection molded with the injection molded body, the other end of the pump shaft being in rotational engagement with the rotor assembly.

4. The electric pump according to any one of claims 1 to 3, wherein the stator assembly comprises a stator core, an insulating frame and a winding, the insulating frame is coated on at least part of the surface of the stator core, and a winding wire of the winding is wound on the insulating frame, and the stator core, the insulating frame and the winding are used as a first assembly body; the injection molding body comprises a first injection molding body, the first injection molding body is formed by injection molding at least by taking the first assembly body as an insert, the first injection molding body is used for coating the stator core, the insulating frame and part of windings, and the windings of the windings are provided with parts extending out of the first injection molding body.

5. The electric pump according to claim 4, further comprising a conductive member including a first connection section, a first injection-molded section, and a connection portion, the first injection-molded section being connected to the connection portion and the first connection section, respectively, the first connection section being in contact with the stator core, the first injection-molded body having an injection-molded hole formed with the first injection-molded section and the winding wire as an insert, the connection portion extending in a direction perpendicular to the electric pump axis.

6. The electric pump of claim 5, wherein the injection molding body comprises a second injection molding piece, the conductive piece comprises a second injection molding section, the second injection molding body has a winding hole through which the winding passes, the second injection molding body has a conductive hole through which the second injection molding section passes, the second injection molding body has a receiving cavity for receiving the connection portion, the second injection molding body has a pin hole, the fixing portion of the pin is located at the pin hole, and the winding of the winding is fixed to and electrically connected with the hanging wire portion of the pin.

7. The electric pump according to claim 6, wherein the injection molded body includes a third injection molded with the pin and the conductive member, the third injection molded body being injection molded with the second injection molded body, a needle portion of the pin including a vertical section extending in parallel with an axial direction of the electric pump, the joint portion being at least a part of the third injection molded body, the joint portion being insert molded with the needle portion;

or, the needle part comprises a vertical section and a horizontal section, the extending direction of the vertical section is parallel to the axial direction of the electric pump, the extending direction of the horizontal section is perpendicular to the axial direction of the electric pump, the joint part is fixed with the third injection molding body in an injection molding way, and the third injection molding body is formed by injection molding the needle part and the joint part as inserts.

8. The electric pump according to claim 5, wherein the first injection molded body has a pin hole, the fixing portion of the pin is located in the pin hole, and the winding wire of the winding is fixed to and electrically connected with the wire hanging portion of the pin;

the injection molding body comprises a second injection molding body, the second injection molding body is injection molded by the contact pin and the conducting piece, the second injection molding body is injection molded and fixed with the first injection molding body, the needle part of the contact pin comprises a vertical section, the extending direction of the vertical section is parallel to the axial direction of the electric pump, the joint part is at least one part of the second injection molding body, and the joint part is injection molded by the needle part as an insert;

or, the needle part comprises a vertical section and a horizontal section, the extending direction of the vertical section is parallel to the axial direction of the electric pump, the extending direction of the horizontal section is perpendicular to the axial direction of the electric pump, the joint part and the point injection molding body are fixed in an injection molding way, and the second injection molding body is formed by injection molding of the needle part and the joint part as inserts.

9. The electric pump of any of claims 3-8, wherein the first injection molded body is injection molded with a first fixed section of the pump shaft, the first injection molded body having a first mounting hole for receiving the first fixed section of the pump shaft, the second fixed section of the pump shaft protruding from the first injection molded body, the second injection molded body being injection molded with a second fixed section of the pump shaft, the second injection molded body having a second mounting hole for receiving the second fixed section of the pump shaft.

10. An assembly method of an electric pump, applied to the electric pump, the electric pump includes a stator assembly, a pin, a rotor assembly and a pump housing, the pump housing includes an injection molding body and a pump cover, the electric pump assembly method includes:

placing the rotor assembly in a rotor cavity of the injection body;

the pump cover is fixedly connected with the injection molding body.

11. The method of assembling of claim 10, wherein the injection molded body comprises a first injection molded body, a second injection molded body, and a third injection molded body, the forming the injection molded body with the stator assembly and the pins as inserts comprising at least:

forming a first injection molding body by taking the stator assembly as an insert injection molding; or the electric pump comprises a pump shaft, and the stator assembly and the pump shaft are used as inserts to form a first injection molding body through injection molding; or the electric pump comprises a conducting piece, wherein a first connecting section of the conducting piece is in contact with the stator core, and the stator assembly, the pump shaft and the conducting piece are subjected to insert injection molding to form a first injection molding body;

injection molding to form a second injection molded body: forming a second injection molding body by taking a winding wire of the winding and a conducting piece as an insert; alternatively, the electric pump comprises a pump shaft, and when the pump shaft is provided with a part protruding out of the first injection molding body, a second injection molding body is formed by taking the protruding part of the pump shaft, the winding and the conducting piece as an insert;

injection molding the third injection molded body: and forming the third injection molding body by taking the contact pin and the conducting piece as insert molding.

12. The method of assembling of claim 11, wherein injection molding the second injection molded body further comprises: and forming a pin hole by taking the first tool as an insert, and forming a second accommodating hole by taking the second tool as an insert.

13. The method of assembling of claim 12, wherein prior to injection molding the third injection molded body, the method of assembling the electric pump comprises: and fixing the contact pin to the contact pin hole, and fixing the winding wire to a wire hanging part of the contact pin.

14. The method of assembling of claim 13, wherein injection molding the second injection molded body when the pin includes a vertical section includes injection molding the joint portion;

alternatively, when the pin includes a vertical section and a horizontal section, the electric pump assembly method further includes: forming the joint portion; injection molding the second injection molded body includes: and forming the second injection molding body by insert molding of the joint part, the pin and the conducting piece.