CN117189682A - Electric pump - Google Patents

Abstract

The application discloses an electric pump, which comprises a rotor assembly and a stator assembly, wherein the electric pump comprises a first cavity and a fourth cavity, the first cavity is not communicated with the fourth cavity, the rotor assembly is positioned in the first cavity, the stator assembly comprises a winding, the wall surface corresponding to the fourth cavity comprises at least part of the outer surface of the winding, the electric pump also comprises heat conducting liquid, at least part of the heat conducting liquid is positioned in the fourth cavity, and at least part of the winding is in contact with the heat conducting liquid. In this way, heat dissipation from the stator assembly is facilitated.

Description

Electric pump

[ field of technology ]

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

[ background Art ]

The electric pump comprises a stator assembly, when the electric pump works, the stator assembly can generate heat, the heat can not be accumulated to a certain extent and can not be timely dissipated, so that the performance of the stator assembly is affected, the service life of the electric pump is shortened, and therefore, how to effectively dissipate heat of the stator assembly is a technical problem.

[ application ]

The application aims to provide an electric pump which is beneficial to heat dissipation of a stator assembly.

In order to achieve the above object, an embodiment of the present application adopts a technical scheme that an electric pump includes a rotor assembly and a stator assembly, the electric pump includes a first cavity and a fourth cavity, the first cavity and the fourth cavity are not communicated, the rotor assembly is located in the first cavity, the stator assembly includes windings, a wall surface corresponding to the fourth cavity includes at least a part of an outer surface of the windings, the electric pump further includes a heat conducting liquid, at least a part of the heat conducting liquid is located in the fourth cavity, and at least a part of the windings are in contact with the heat conducting liquid.

In the technical scheme of the application, the stator assembly comprises a winding, the wall surface corresponding to the fourth cavity comprises at least part of the outer surface of the winding, the electric pump further comprises heat conducting liquid, at least part of the heat conducting liquid is positioned in the fourth cavity, and at least part of the winding is in contact with the heat conducting liquid. In this way, the stator assembly is facilitated to dissipate heat, thereby facilitating an increase in the service life of the electric pump.

[ description of the drawings ]

FIG. 1 is a schematic perspective view of one embodiment of an electric pump of the present application in one view;

FIG. 2 is a schematic cross-sectional view of the electric pump of FIG. 1 in one direction;

FIG. 3 is a schematic cross-sectional view of another embodiment of an electric pump according to the present application in one direction;

FIG. 4 is a schematic cross-sectional view of a third embodiment of an electric pump according to the present application in one direction;

fig. 5 is a schematic cross-sectional view of a fourth embodiment of an electric pump according to the present application in one direction;

fig. 6 is a schematic perspective view of the control panel assembly of fig. 2, 3, 4 and 5 from one perspective;

FIG. 7 is a schematic perspective view of the spacer sleeve of FIGS. 2, 3, 4 and 5 from one perspective;

FIG. 8 is a schematic cross-sectional view of the spacer sleeve of FIGS. 2, 3, 4 and 5 in one direction;

fig. 9 is a schematic perspective view of the embodiment of fig. 2, 3, 4 and 5 showing the electric pump from one perspective;

FIG. 10 is a schematic perspective view from one perspective of FIG. 9 without the second and fourth portions installed;

in the accompanying drawings: 100, an electric pump; 11, a pump housing; 111 a first housing; 1111, inlet; 1112, an outflow port, 1113, a first connection portion; 112 a second housing; 1121 a second connection; 1122, a first inner groove; 113, a bottom cover; 121 a rotor assembly; 122 an impeller assembly; 13, a stator assembly; 131, a stator; 14, a pump shaft; 15, a control panel assembly; 151, a substrate; 1511, front surface; 1512, the back surface; 152 electronic components; 16, a spacer sleeve; 161 top; 1611, a flange portion; 162, bottom; 1621 an upper surface; 1622 a lower surface; 163 side portions; 1631 an inner surface; 1632 an outer surface; 164, pump shaft limiting part; 18, a second communication part; 19, a jack; 20, heat conducting liquid; 22, an oil inlet part; 221 a first portion; 222 a second portion; 23, an air outlet part; 231, a third part; 232 a fourth part; 25, a first sealing ring; 26, a second sealing ring; 27: a first chamber; 281 a second chamber; 282 a third chamber; 29 a fourth chamber; 30, a separator; 101, the axial direction of an electric pump; 1123 a third connection; 1133 a fourth connection; 40, a second inner groove; 50, a third sealing ring; 51, a first communication part;

[ detailed description ] of the application

The application is further described with reference to the accompanying drawings and specific examples:

the following detailed description of the application refers to the accompanying drawings. First, it should be noted that, in the present specification, terms of upper, lower, left, right, front, rear, inner, outer, top, bottom, and the like are defined with respect to the configurations shown in the corresponding drawings, and are relative concepts, so that they may be changed according to different positions and different usage states. Therefore, these and other directional terms should not be construed as limiting terms.

The electric pump in the following embodiments is capable of providing flow power to a working medium of an automotive thermal management system, the working medium comprising 50% glycol aqueous solution or clear water.

Referring to fig. 1 and 2, the electric pump 100 includes a pump housing 11, a rotor assembly 121, a stator assembly 13, a pump shaft 14, a control plate assembly 15, a spacer, and an impeller assembly 122, the pump housing 11 includes a first housing 111, a second housing 112, and a bottom cover 113, the second housing 112 is located between the first housing 111 and the bottom cover 113 along a height direction of the electric pump 100, and of course, only a part of the second housing 112 may be located between the first housing 111 and the bottom cover 113; referring to fig. 1 and 2, the first housing 111, the second housing 112 and the bottom cover 113 are fixedly and sealingly connected with each other, the electric pump 100 includes a first cavity 27 and a fourth cavity 29, the first cavity 27 can have a working medium flowing therethrough, the fourth cavity 29 has no working medium flowing therethrough, at least a portion of the pump shaft 14 is disposed in the first cavity 27, the rotor assembly 121 is sleeved outside the pump shaft 14, the rotor assembly 121 is fixedly connected with the impeller assembly 122, the stator assembly 13 includes a stator 131 and a pin, the stator includes a stator core and a winding, the winding is wound on the stator core, and the winding of the stator 131 is electrically connected with the control board assembly 15 through the pin.

Referring to fig. 1 and 2, the first housing 111 is an injection molding member, the injection molding member is provided with a flow inlet 1111 and a flow outlet 1112, when the electric pump 100 works, a working medium enters the first cavity 27 through the flow inlet 1111, then the working medium leaves the first cavity 27 through the flow outlet 1112, when the electric pump 100 works, a control circuit on the control board assembly 15 is connected with an external power supply by inserting a connector (not shown in the drawing) into a connector socket 19 of the electric pump 100, the control circuit controls current passing through the stator assembly 13 to change according to a certain rule, so that the stator assembly 13 is controlled to generate a changing magnetic field, the rotor assembly 121 rotates around the pump shaft 14 under the action of the magnetic field or rotates along with the pump shaft 14, so that the working medium entering the first cavity 27 rotates along with the rotor assembly 121, and the working medium leaves the first cavity 27 due to centrifugal force to generate flowing power.

Referring to fig. 2, as an implementation, the first cavity 27 and the fourth cavity 29 are not communicated, the rotor assembly 121 is located in the first cavity 27, the stator assembly 13 includes a stator 131, the stator 131 includes a stator core and windings, the windings are wound on the stator core, a wall surface corresponding to the fourth cavity 29 includes at least a part of an outer surface of the windings, the electric pump 100 further includes a heat conductive liquid 20, at least a part of the heat conductive liquid 20 is located in the fourth cavity 29, and at least a part of the windings are in contact with the heat conductive liquid 20. In this way, heat dissipation from the stator assembly 13 is facilitated, thereby increasing the service life of the electric pump 100.

Further, as an implementation, as shown in fig. 2 and 6, the heat conducting liquid 20 includes an insulating heat conducting liquid, and the insulating heat conducting liquid has an insulating property and a heat conducting property, specifically, a heat conducting coefficient of the insulating heat conducting liquid is greater than a heat conducting coefficient of air at the same temperature. The resistivity of the insulating heat-conducting liquid at normal temperature is more than or equal to 10 ¹⁰ Omega.m. The thermal conductivity of air, λ (W/m·k), increases as the temperature increases. At 0 ℃, the thermal conductivity of air, λ, is 0.024, and at 100 ℃ the thermal conductivity of air, λ, is 0.031. More specifically, the insulating and heat conducting liquid includes insulating and heat conducting oil. Of course, the insulating heat conducting oil is not limited, and other liquids with insulating and heat conducting properties can be used. In this way, when the stator assembly 13 is processed, only the surface of the stator 131 of the stator assembly 13 may be provided with the first protection portion for reducing the corrosion of the stator 131 by the insulating and heat-conducting liquid 20, specifically, the winding further includes the first protection portion (not shown in the figure), and at least the outer surface of the winding of the stator 131 is covered with the protection portion. Of course, the first protecting part may not be provided, and the windings of the stator 131 of the stator assembly 13 may be directly contacted with the insulating heat conducting liquid. In this way, the manufacturing process of the stator assembly 13 is effectively simplified, the production cycle of the electric pump 100 is shortened, and the production cost of the electric pump 100 is further reduced. Because the thermal conductivity of the insulating and thermally conductive liquid 20 is greater than that of air, the heat dissipation efficiency can be effectively improved compared with the prior method of conducting heat through air.

Of course, as another implementation manner, please refer to fig. 2 and fig. 6 again, the heat-conducting liquid 20 may have only a heat-conducting property, and the winding of the stator 131 of the stator assembly 13 may be insulated, where the winding further includes a first insulation portion (not shown) and an enameled wire, the first insulation portion is at least disposed on an outer surface of the enameled wire, and the first insulation portion is used for isolating the winding from the heat-conducting liquid 20. Since the heat conducting liquid 20 has only the property of heat conduction, the selectable space of the heat conducting liquid 20 is increased, which lays a foundation for reducing the production cost of the electric pump 100.

For the path conducted by the electric pump, the heat generated by the stator assembly can be conducted to the outside of the electric pump through the pump housing by contacting the heat conducting liquid with the pump housing, and the heat generated by the stator assembly can be conveyed to the outside of the electric pump through the flow of the working medium in the isolation part by contacting the heat conducting liquid with the isolation part.

Specifically, referring to fig. 1 and 2, as an implementation manner, the isolation portion includes an injection molding body, the electric pump 100 includes a pump housing 11, the pump housing 11 is integrally injection molded with the injection molding body, specifically, the isolation portion may be integrally injection molded by using the stator assembly 13 as an insert or using the stator assembly 13 and the pump shaft 14 as an insert, or may be directly injection molded without an insert to form the pump housing 11 and the injection molding body.

Of course, the isolation part may also be a separate component, as an implementation manner, please refer to fig. 1 and 2 again, where the isolation part includes an isolation sleeve 16, the electric pump 100 includes a pump housing 11, the pump housing 11 includes a first housing 111, a second housing 112 and a bottom cover 113, the isolation sleeve 16 is located in the second housing 112, the first housing 111 is fixedly and hermetically connected to the second housing 112, the bottom cover 113 is fixedly and hermetically connected to the second housing 112 or the bottom cover 113 and the second housing 112 are integrated, a cavity enclosed by the isolation sleeve 16 and the first housing 111 includes a first cavity 27, and a cavity enclosed by the second housing 112, the isolation sleeve 16 and the bottom cover 113 includes a fourth cavity 29. In this way, the spacer 16 is manufactured separately, which is advantageous in simplifying the structure of the mold in the manufacturing process of the spacer 16, and thus in reducing the manufacturing cost of the electric pump 100.

Further, referring to fig. 2, 7 and 8, the spacer 16 includes a bottom 162 and a side 163, the side 163 protrudes from the bottom 162, the stator assembly 13 is limited to the side 163, and at least a portion of the heat-conducting liquid 20 contacts the side 163. The following explanation is required: the limit setting referred to herein includes an interference fit and a transition fit. In this way, when the electric pump 100 works, heat generated by the stator assembly 13 is transferred to the working medium flowing in the isolation sleeve 16 through the heat conduction liquid 20, and at least part of heat generated by the stator assembly 13 is output to the outside of the electric pump 100 through the flow of the working medium 20, so that heat dissipation of the stator assembly 13 is facilitated, and the service life of the electric pump 100 is prolonged.

As an implementation manner, referring to fig. 3 and 6, the electric pump further includes a control board assembly 15, the stator assembly 13 is electrically connected to the control board assembly 15, the electric pump 100 includes a second cavity 281, the control board assembly 15 includes an electronic component 152, a wall corresponding to the second cavity 281 includes at least a portion of an outer side wall of the electronic component 152, at least a portion of the heat conductive liquid 20 is located in the second cavity 281, and at least a portion of the electronic component 152 is in contact with the heat conductive liquid 20. Through such a mode, can dispel the heat to stator module 13 and control panel subassembly 15 simultaneously, and radiating efficiency is faster, to high-power electric pump, quick heat dissipation, more be favorable to improving electric pump's life.

Further, as an implementation, referring to fig. 3, the stator assembly 13, the spacer sleeve 16, and the control board assembly 15 are disposed along the height direction of the electric pump, the electric pump 100 includes a third cavity 282, the third cavity 282 is located between the control board assembly 15 and the spacer sleeve 16, and the second cavity 281 is located between the bottom cover 113 and the control board assembly 15; or third chamber 282 is located between bottom cover 113 and control panel assembly 15 and second chamber 281 is located between control panel assembly 15 and spacer 16. Thus, a miniaturized design of the electric pump 100 in the radial direction is facilitated. The height direction of the electric pump 100 is the direction in which the pump shaft of the electric pump extends. The radial direction of the electric pump is the direction perpendicular to the height of the electric pump. By such an arrangement, only the second chamber 281 can be filled with an appropriate amount of the heat conductive liquid 20, which is advantageous in realizing a lightweight design of the electric pump 100. Specifically, as an implementation manner, referring to fig. 5, 7 and 8, the second cavity 281 and the third cavity 282 are not communicated, the second cavity 281 is located between the control board assembly 15 and the spacer 16, the substrate 151 includes a front surface 1511 and a back surface 1512, the front surface 1511 is closer to the spacer 16 than the back surface 1512, at least part of the electronic components 152 are disposed on the front surface 1511, a proper amount of heat-conducting liquid 20 can be filled into the second cavity 281, and at least part of the electronic components 152 are in contact with the heat-conducting liquid 20, so that the lightweight design of the electric pump is facilitated.

Further, when the electric pump works, at least part of heat generated by the electronic components is transferred to a side flowing working medium in the isolation sleeve through the heat conduction liquid, and the heat generated by the heat generating electronic components is input to the outside of the electric pump through the flowing of the side working medium in the isolation sleeve. Specifically, as one implementation, referring to fig. 3, 6, 7, and 8, the spacer 16 includes a bottom portion 162 and a side portion 163, the bottom portion 162 includes an upper surface 1621 and a lower surface 1622, the lower surface 1622 is closer to the control plate assembly 15 than the upper surface 1621, and at least a portion of the lower surface 1622 is in contact with the thermally conductive liquid 20. The heat-conducting liquid 20 contacts the spacer 16 to transfer heat to the spacer 16, and the heat generated by at least some electronic components is carried to the outside of the electric pump 100 by the flow of a working medium, such as water or an aqueous solution, inside the spacer 16, and the control board assembly 15 includes a substrate 151 and an electronic component 152, the electronic component 152 is fixedly connected to the substrate 151, the electronic component 152 includes a heat-generating electronic component (not shown in the drawing), and the heat-generating component includes a diode, a MOS tube, an inductance, a resistance, a capacitance, and other common electronic components that are prone to generate heat. In these heat-generating electronic components, the switching tube (diode, MOS tube) is more sensitive to heat, so in order to quickly dissipate the heat of the switching tube, the switching tube is usually disposed on the lower surface 1622 near the bottom of the isolation sleeve, and other heat-generating electronic components, such as an inductor, a resistor and a capacitor, are far away from the lower surface of the bottom of the isolation sleeve due to the limited area of the lower surface 1622 of the bottom 162 of the isolation sleeve 16, and the other heat-generating electronic components can dissipate the heat only by air conduction, so that the heat dissipation efficiency is relatively slow, and the service life of the other heat-generating electronic components is likely to be reduced. Through the above arrangement, firstly, the arrangement of the electronic components 152 on the control board assembly 15 is not affected by the bottom surface area of the spacer sleeve 16, the arrangement space of the electronic components 152 is increased, so that the limited area of the substrate 151 can be utilized as much as possible, which is beneficial to realizing miniaturization of the substrate 151 and further realizing miniaturization design of the electric pump 100; secondly, the arrangement of the electronic components 152 on the control panel assembly 15 is not influenced by the area of the lower surface 1622 of the bottom 162 of the isolation sleeve 16, the arrangement space of the electronic components 152 is increased, the optimization of the control circuit in the control panel assembly 15 is facilitated, and a certain foundation is laid for reducing the production cost of the electric pump; thirdly, the electronic components 152 can be integrally immersed in the heat conducting liquid 20, and the electronic components 152 can fully exchange heat with the heat conducting liquid 20, so that the heat dissipation efficiency of the electronic components 152 is effectively improved. Fourth, because of reasonable heat dissipation, the selectable space of the electronic component 152 is increased, for example, a MOS tube with larger internal resistance can be selected, which is beneficial to reducing the production cost of the electronic component 152 and further reducing the production cost of the electric pump 100.

As an implementation, referring to fig. 3 and 6, the electric pump 100 includes the second communication portion 18, and the fourth chamber 29 communicates with the second chamber 281 or the third chamber 282 through the second communication portion 18. Specifically, when the third chamber 282 is located between the spacer 16 and the control board assembly 15, the fourth chamber 29 communicates with the third chamber 282 through the second communication portion 18, and when the second chamber 281 is located between the spacer 16 and the control board assembly 15, the fourth chamber 29 communicates with the second chamber 281 through the second communication portion 18. More specifically, the electric pump includes a partition board 30, where the partition board 30 and the second housing 112 may be integrally provided, and the partition board 30 and the second housing 112 may be in a split structure, where it should be noted that, in the split structure, the partition board 30 and the second housing 112 are zero separate parts and are fixedly connected in an assembled manner. The fourth chamber 29 is located at one side of the partition 30, the second chamber 281 or the third chamber 282 is located at the other side of the partition 30, and in particular, the fourth chamber 29 is located at the upper side of the partition 30, and the second chamber 281 or the third chamber 282 is located at the lower side of the partition 30. In this embodiment, the second chamber 281 is located at the lower side of the partition plate 30. The second communication portion 18 has a hole-like structure, and penetrates the upper and lower surfaces of the separator 30 in the thickness direction of the separator 30. The second chamber 281 is provided near the fourth chamber 29, and only one oil inlet portion may be provided, which is advantageous in simplifying the structure of the electric pump. Of course, in the above implementation manner, the second cavity 281 and the third cavity 282 may be disposed in a communicating manner, or may not be disposed in a communicating manner, as an implementation manner, please refer to fig. 5, where the second cavity 281 and the third cavity 282 are not connected, so that only the second cavity 281 and the fourth cavity 29 may be filled with an appropriate amount of heat-conducting liquid, so that at least part of the stator assembly 13 and at least part of the electronic components 152 are in contact with the heat-conducting liquid 20, which is beneficial to implementing the lightweight design of the electric pump 100.

As another implementation, referring to fig. 3, the electric pump 100 further includes a first communication portion 51, and the third chamber 282 and the second chamber 281 are communicated through the first communication portion 51. Specifically, when the third chamber 282 is located between the control board assembly 15 and the spacer sleeve 16 and the second chamber 281 is located between the bottom cover 113 and the control board assembly 15, the fourth chamber 29 communicates with the second chamber 281 through the second communication portion 51, and the second chamber 281 communicates with the third chamber 282 through the first communication portion 51. Specifically, the first communication portion 51 includes a communication hole, which may be disposed on the substrate 151, and the communication hole penetrates the substrate 151 along a thickness direction of the substrate 151, and of course, a first gap may be preset between a sidewall of the substrate 151 and an inner wall of the second housing 112, and the first communication portion 51 includes the first gap. Of course, other embodiments are possible and are not specifically limited herein. In this way, firstly, the heat-conducting liquid 20 in the fourth chamber 29 can flow into the second chamber 281, so that an oil inlet can be designed, which is advantageous for simplifying the structure of the electric pump. Because the heat conducting liquid 20 exists in the second cavity 281 and the third cavity 282, when the electronic components 152 are arranged, the electronic components 152 can be arranged on the front surface 1511 and the back surface 1512 of the substrate 151, the front surface 1511 of the substrate 151 is close to the isolation sleeve 16, and the back surface 1512 of the substrate 151 is far away from the isolation sleeve 16, so that the arrangement space of the electronic components 152 can be increased, the radial dimension of the substrate 151 can be reduced, the miniaturization of the substrate 151 can be facilitated, and the miniaturization design of the electric pump 100 can be facilitated.

As an implementation manner, referring to fig. 3, 9 and 10, the electric pump 100 further includes an oil inlet portion 22, where the oil inlet portion 22 includes a first portion 221 and a second portion 222, the first portion 221 is in a hole structure, the second portion 222 is in a column structure, the first portion 221 is used as a filling inlet when the electric pump 100 is filled with the heat-conducting liquid 20, one end of the first portion 221 is communicated with the second cavity 281, the other end of the first portion 221 is communicated with the outside of the electric pump 100, at least part of the second portion 222 is located in the first portion 221, and the first portion 221 and the second portion 222 are fixedly connected in a sealing manner. Therefore, the structure of the oil inlet part is facilitated to be simplified, and the structure of the electric pump is further simplified.

Further, referring to fig. 3, 9 and 10, the electric pump further includes an air outlet portion, the air outlet portion 23 includes a third portion 231 and a fourth portion 232, the third portion 231 is in a hole structure, the fourth portion 232 is in a column structure, when the heat conductor 20 is filled into the electric pump 100, the fourth portion 232 is not installed into the third portion 231, and the third portion 231 can be used as an outlet of air inside the electric pump 100. The other end of the third portion 231 communicates with the outside of the electric pump 100, and at least a part of the fourth portion 232 is located at the third portion 231, and the third portion 231 is fixedly connected with the fourth portion 232 in a sealing manner. Specifically, the oil inlet portion 22 and the air outlet portion 23 are provided on the bottom cover 113. When the heat conducting liquid is filled, the second part 222 is not fixedly connected to the first part 221 in a sealing way, the fourth part 232 is not fixedly connected to the second part 222 in a sealing way, after the insulating heat conducting liquid is filled, the first part 221 is fixedly connected to the second part 222 in a sealing way, and the third part 231 is fixedly connected to the second part 222 in a sealing way. In this embodiment, the bottom cover 113, the second portion 222 and the fourth portion 232 are all plastic members, the first portion 221 and the second portion 222 may be fixedly connected by welding, and the third portion 231 and the fourth portion 232 may be fixedly connected by welding. Further, in order to enhance the sealing property of the first portion 221 and the second portion 222, a leakage preventing glue may be circumferentially disposed at a gap where the first portion 221 and the second portion 222 are connected, and a leakage preventing glue may be circumferentially disposed at a gap where the third portion 231 and the fourth portion 232 are connected, for preventing the heat conductive liquid from penetrating to the outside of the electric pump through the gap.

Further, as an implementation, referring to fig. 2 and 6, the heat conducting liquid 20 includes an insulating heat conducting liquid, where the insulating heat conducting liquid has an insulating property and a heat conducting property, and specifically, the heat conducting coefficient of the insulating heat conducting liquid is greater than that of air at the same temperature. The resistivity of the insulating heat-conducting liquid at normal temperature is more than or equal to 10 ¹⁰ Omega.m. The thermal conductivity of air, λ (W/m.k), increases with increasing temperature. The thermal conductivity of air at 0℃is 0.024 and at 100℃is 0.031. More specifically, the insulating and heat conducting liquid includes insulating and heat conducting oil. Of course and togetherThe liquid is not limited to insulating heat conducting oil, and can be other liquids with insulating and heat conducting properties. In this way, when the surface of the electronic component 152 of the control board assembly 15 is treated, a protection portion (not shown in the drawing) for reducing corrosion of the electronic component 152 by the heat-conducting liquid 20 may be disposed on the surface of the electronic component 152, and specifically, the electronic component further includes a second protection portion and a component, where the second protection portion wraps at least part of the outer surface of the component. More specifically, the electronic component 152 includes a soldering portion and a component, the component is electrically connected to the substrate 151 through the soldering portion, and the second protection portion is provided on at least a surface of the component and a surface of the soldering portion. In this way, the manufacturing process of the control board assembly 15 can be effectively simplified, the production cycle of the electric pump 100 can be shortened, and the production cost of the electric pump 100 can be further reduced. Because the thermal conductivity of the insulating and thermally conductive liquid 20 is greater than that of air, the heat dissipation efficiency can be effectively improved compared with the prior method of conducting heat through air.

Of course, as another implementation manner, please refer to fig. 2 and fig. 6 again, the heat-conducting liquid 20 may have only a heat-conducting property, and the electronic component 152 of the control board assembly 15 may be subjected to an insulation treatment, where the electronic component 152 includes a second insulation portion (not shown in the drawing), and the second insulation portion is used to isolate the electronic component 152 from the heat-conducting liquid 20. Specifically, the electronic component 152 includes a solder portion, an insulating portion, and a component, and the component is electrically connected to the substrate 151 through the solder portion. The second insulating part is arranged at least on the outer side wall surface of the component and the surface of the welding part. The second insulation does not affect the heat transfer between the electronic component 152 and the heat conducting liquid 20. Since the heat conducting liquid 20 has only the property of heat conduction, the selectable space of the heat conducting liquid 20 is increased, which lays a foundation for reducing the production cost of the electric pump 100. Further, in order to prevent the insulating and heat-conducting liquid from corroding the insulating portion, as an implementation manner, the electronic component includes a second insulating portion, a soldering portion, a protecting portion, and a component, the component is electrically connected to the substrate 151 through the soldering portion, the second insulating portion is at least disposed on an outer side wall surface of the component, a surface of the soldering portion, and the protecting portion is at least disposed on a surface of the second insulating portion. In this way, the lifetime of the electronic component can be increased.

To achieve that the first cavity 27 is not in communication with the fourth cavity 29, as an implementation, please refer to fig. 1, 4, 7 and 8, where the spacer 16 includes a top portion 161, a bottom portion 162 and a side portion 163, the side portion 163 is located between the top portion 161 and the bottom portion 162, the top portion 161 includes a flange portion 1611, the flange portion 1611 extends radially outward of the side portion 163, the first cavity 27 is located inside the side portion 163, the stator assembly 13 is disposed outside the side portion 163, and specifically, the stator 131 is disposed in cooperation with the side portion 163 of the spacer 16, where the cooperation includes an interference fit, a transition fit or a clearance fit. The first housing 111 includes a first connection portion 1113, the second housing 112 includes a second connection portion 1121, the flange portion 1611 is located between the first connection portion 1113 and the second connection portion 1121, the second connection portion 1121 includes a first inner groove 1122, the first inner groove 1122 is recessed in an upper surface of the second connection portion 1121, the electric pump 100 further includes a first seal ring 25, the first seal ring 25 is located in the first inner groove 1122, a lower surface of the flange portion 1611 is in contact with the first seal ring 25, a certain force is applied in a direction perpendicular to an upper surface of the flange portion 1611, for example, a certain downward force may be applied, and the lower surface of the flange portion 1611 and the second connection portion 1121 are in sealing connection through the first seal ring 25, so that the first chamber 27 and the second chamber 281 are in sealing non-communication. The working medium is prevented from seeping out to the outside of the side portion 163 from the gap between the second connecting portion 1121 and the lower surface of the flange portion 1611 by the structure in which the first seal ring 25 is provided. More specifically, the electric pump 100 further includes a second sealing ring 26, where the second sealing ring 26 is disposed between the first housing 111 and the upper surface of the flange portion 1611, and the first housing 111, the spacer sleeve 16, and the second housing 112 are fixedly connected in a sealing manner by a fastening structure, specifically, the first housing 111, the spacer sleeve 16, and the second housing 112 are fixedly connected in a sealing manner by bolts, and other manners, for example, the first housing 111 and the second housing 112 are all made of plastic materials, the first housing 111 and the second housing 112 are fixedly and hermetically connected by welding, and the second sealing ring 26 is configured to form a two-way protection, so that it is fully ensured that an external medium does not penetrate into the outer side of the side portion 163 of the spacer sleeve 16. Referring to fig. 4, the second housing 112 includes a third connecting portion 1123, the bottom cover includes a fourth connecting portion 1133, the third connecting portion 1123 or the fourth connecting portion 1133 is provided with a second groove 40, in this embodiment, the second groove 40 is concave in the lower surface of the third connecting portion 1123, a third sealing ring 50 is disposed in the second groove 40, and the third connecting portion 1123 and the fourth connecting portion 1133 are fixedly connected by the third sealing ring 50. To enhance the sealing property of the second chamber 281, an adhesive portion may be provided around a circumference of a gap where the third connection portion 1123 and the fourth connection portion 1133 are connected, the adhesive portion being for preventing the heat conductive liquid 20 in the second chamber 281 from leaking to the outside of the electric pump through the gap where the third connection portion 1123 and the fourth connection portion 1133 are connected.

The structure and materials of the spacer will be further described below:

referring to fig. 3, 7 and 8, the material of the spacer 16 may be a plastic material, and as an implementation manner, the plastic material is a heat conductive plastic material, and it should be noted that, at the same temperature, the heat conductivity coefficient of the heat conductive plastic material is greater than or equal to that of a metal material, where the metal material includes, but is not limited to, aluminum, copper, aluminum alloy, stainless steel, and the like. Of course, the material of the insulating sleeve 16 may be partially made of metal, specifically, the insulating sleeve 16 may be injection molded with a metal piece as an insert, and as an implementation manner, the material of at least part of the side 163 of the insulating sleeve 16 is made of metal, at least the side 163 of the insulating sleeve 16 is in contact with the heat conducting liquid 20, so that the heat conducting efficiency of the insulating sleeve 16 is improved, and at the same time, the lightweight design of the electric pump 100 is further facilitated. Of course, as other embodiments, the bottom 162 and the side 163 of the spacer 16 are both metallic materials.

Referring to fig. 3, 7 and 8 again, as an implementation manner, the spacer 16 is made of a metal material, the stator assembly 13 is sleeved on the outer periphery of the side portion 163, the rotor assembly 121 is located on the inner periphery of the side portion 163, the side portion 163 includes an inner surface 1631 and an outer surface 1632, the inner surface 1631 is located closer to the central axis of the spacer 16 than the outer surface 1632, in this embodiment, the inner surface 1631 and the outer surface 1632 of the side portion 163 are both smooth, that is, no other structure is provided on the inner surface 1631 and the outer surface 1632, although other structures may be provided on the inner surface 1631 and the outer surface 1632 of the side portion 163; the bottom 162 includes an upper surface 1621 and a lower surface 1622, the upper surface 1621 is closer to the opening side of the spacer 16 than the lower surface 1622, in this embodiment, the upper surface 1621 and the lower surface 1622 of the bottom 162 are both smooth, i.e. no other structure is provided on the upper surface 1621 and the lower surface 1622, although other structures may be provided on the upper surface 1621 and the lower surface 1622 of the bottom 162; in this embodiment, the thickness of the side portion 163 is equal to or less than the thickness of the bottom portion 162, where "thickness of the side wall" refers to the vertical distance between the inner surface 1631 and the outer surface 1632 of the side portion 163, and "thickness of the bottom portion" refers to the vertical distance between the upper surface 1621 and the lower surface 1622 of the bottom portion 162; the thickness of the side 163 is smaller than or equal to the thickness of the bottom 162, so that on one hand, the strength of the bottom of the spacer sleeve 16 can be ensured, and referring to fig. 3 again, the thin side 163 is more beneficial to heat conduction among the working medium, the side of the spacer sleeve 16, the stator assembly 13 and the heat conducting liquid 20, so that the heat dissipation of the stator assembly 13 is facilitated, and in this embodiment, the thickness of the side 163 is smaller than or equal to 1.5mm; as shown in fig. 7, the spacer 16 is made of a stainless steel material, specifically, referring to fig. 7 again, the spacer 16 is made of an austenitic stainless steel material, the spacer 16 is formed by stamping and stretching a metal plate, the spacer 16 is provided with a pump shaft 14 limiting portion 164, the pump shaft 14 limiting portion 164 is formed at the bottom 162, and in combination with fig. 3, the pump shaft 14 limiting portion 164 is convexly arranged towards the second cavity 281, so that the contact area between the bottom 162 and the heat conducting liquid 20 can be increased, and the heat dissipation efficiency of the electric pump 100 is improved.

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

Claims (16)

1. An electric pump comprising a rotor assembly (121) and a stator assembly (13), the electric pump (100) comprising a first chamber (27) and a fourth chamber (29), characterized in that: the first cavity (27) and the fourth cavity (29) are not communicated, the rotor assembly (121) is located in the first cavity (27), the stator assembly (13) comprises windings, the wall surface corresponding to the fourth cavity (29) comprises at least part of the outer surface of the windings, the electric pump (100) further comprises heat conducting liquid (20), at least part of the heat conducting liquid (20) is located in the fourth cavity (29), and at least part of the windings are in contact with the heat conducting liquid (20).

2. The electric pump of claim 1, wherein: the heat conductive liquid (20) comprises an insulating heat conductive liquid, the heat conductive coefficient of the insulating heat conductive liquid is larger than that of air at the same temperature, and the resistivity of the insulating heat conductive liquid is larger than or equal to 10 at normal temperature ¹⁰ Ω.m。

3. The electric pump of claim 1, wherein: the winding comprises a first insulation part and an enameled wire, wherein the first insulation part is at least arranged on the outer surface of the enameled wire, and the first insulation part is used for isolating the winding from the heat conducting liquid (20).

4. A motor pump according to any one of claims 1-3, characterized in that: the electric pump comprises a separation part, the separation part comprises an injection molding body, the electric pump comprises a pump housing (11), the pump housing (11) and the injection molding body are integrally formed by injection molding,

or the isolation part comprises an isolation sleeve (16), the electric pump (100) comprises a pump housing (11), the pump housing (11) comprises a second housing (112) and a bottom cover (113), the isolation sleeve (16) is positioned in the second housing (112), the isolation sleeve (16) comprises a bottom (162) and a side part (163), a cavity formed by the bottom (162) and the side part (163) comprises a first cavity (27), the bottom cover (113) is fixedly and hermetically connected with the second housing (112) or the bottom cover (113) and the second housing (112) are integrated into a whole, and the cavity formed by the isolation sleeve (16) and the bottom cover (113) comprises a fourth cavity (29).

5. The electric pump of claim 4, wherein: the stator assembly (13) is limited to the side part (163), and at least part of the heat conducting liquid (20) is in contact with the side part (163).

6. The electric pump of claim 5, wherein: the material of the isolation sleeve (16) is at least partially metal.

7. The electric pump harvested as claimed in claim 6, wherein: at least a portion of the side portion (163) is of a metallic material.

8. An electric pump according to any one of claims 4-7, characterized in that: the electric pump further comprises a control board assembly (15), the stator assembly (13) is electrically connected with the control board assembly (15), the electric pump (100) comprises a second cavity (281), the control board assembly (15) comprises an electronic component (152), the wall surface corresponding to the second cavity (281) comprises at least part of the outer side wall surface of the electronic component (152), at least part of the heat conducting liquid (20) is located in the second cavity (281), and at least part of the electronic component (152) is in contact with the heat conducting liquid (20).

9. The electric pump of claim 8, wherein: -arranging the stator assembly (13), the spacer sleeve (16) and the control board assembly (15) along the height direction of the electric pump (100), wherein the electric pump (100) comprises a third cavity (282), the third cavity (282) is positioned between the control board assembly (15) and the spacer sleeve (16), and the second cavity 281 is positioned between a bottom cover (113) and the control board assembly (15);

or the third cavity (282) is located between the bottom cover (113) and the control board assembly (15), and the second cavity (281) is located between the control board assembly (15) and the spacer sleeve (16).

10. The electric pump of claim 9, wherein: the spacer sleeve (16) includes a bottom (162) and a side (163), the bottom (162) including an upper surface (1621) and a lower surface (1622), the lower surface (1622) being closer to the control board assembly (15) than the upper surface (1621), at least a portion of the lower surface (1622) being in contact with the thermally conductive liquid (20).

11. The electric pump according to claim 9 or 10, characterized in that: the electric pump (100) includes a second communication portion (18), and the fourth chamber (29) communicates with the second chamber (281) or the third chamber (282) through the second communication portion (18).

12. The electric pump of claim 11, wherein: the electric pump (100) further includes a first communication portion (51), and the second chamber (281) and the third chamber (282) communicate through the first communication portion (51).

13. An electric pump according to any one of claims 8-12, characterized in that: the control board assembly (15) comprises a substrate (151), the electronic component (152) comprises a welding part, a second insulating part and a component, the component is electrically connected with the substrate (151) through the welding part, the second insulating part is at least arranged on the outer side wall surface of the component and the surface of the welding part, and the second insulating part isolates the electronic component (152) from the heat conducting liquid (20).

14. An electric pump according to any one of claims 8-13, characterized in that: the electronic component further comprises a second protection part, and the second protection part is at least arranged on the surface of the electronic component (152).

15. An electric pump according to any one of claims 1-14, characterized in that: the electric pump (100) further comprises an oil inlet part (22), the oil inlet part (22) comprises a first part (221) and a second part (222), the first part (221) is of a hole-shaped structure, the second part (222) is of a columnar structure, one end of the first part (221) is communicated with the second cavity (281), the other end of the first part (221) is communicated with the outside of the electric pump (100), at least part of the second part (222) is located in the first part (221), and the first part (221) is fixedly connected with the second part (222) in a sealing mode.

16. The electric pump of claim 15, wherein: the electric pump (100) further comprises an air outlet part (23), the air outlet part (23) comprises a third part (231) and a fourth part (232), one end of the third part (231) is communicated with the second cavity (281), the other end of the third part (231) is communicated with the outside of the electric pump (100), at least part of the fourth part (232) is located at the third part (231), and the third part (231) is fixedly connected with the fourth part (232) in a sealing mode.