CN116292316A - Stator assembly, electronic pump and electronic pump manufacturing method - Google Patents

Abstract

The application discloses stator module includes stator shell, stator winding and pump shaft, and stator pump shell includes the isolation part, and the isolation part includes medial part and interior bottom, and interior bottom forms the rotor chamber with the medial part, and the pump shaft includes installation department, cooperation portion and location portion, and installation department is located the rotor intracavity at least partially, and cooperation portion is spacing to be connected or fixed connection with interior bottom, and installation department is located the rotor intracavity at least partially, and cooperation portion runs through in the upper surface of interior bottom and the lower surface of interior bottom, location portion at least partial protrusion in the lateral surface of interior bottom. The application also discloses an electronic pump and a manufacturing method of the electronic pump. Through the structure, the coaxiality error of the pump shaft and the stator shell is reduced, so that the assembly performance of the stator assembly and matched parts, such as a rotor assembly, is improved, and noise is reduced.

Description

Stator assembly, electronic pump and electronic pump manufacturing method

[ field of technology ]

The present disclosure relates to electronic pumps, and more particularly, to a stator assembly for a thermal cycling system, an electronic pump, and a method of manufacturing the electronic pump.

[ background Art ]

In recent decades, electronic pumps have gradually replaced traditional mechanical pumps and have been used in large numbers in circulatory systems. The electronic pump has the advantages of no electromagnetic interference, high efficiency, environmental protection, stepless speed regulation and the like, and can well meet the market requirements.

The electronic pump comprises a rotor assembly, a stator assembly and a pump shaft, wherein the rotor assembly and the stator assembly are completely isolated by an isolating sleeve, the rotor assembly is sleeved on the pump shaft, the pump shaft and the isolating sleeve are arranged in a split mode, and the accumulation of multistage assembly errors causes the out-of-tolerance coaxiality of the pump shaft relative to the stator assembly, so that the electronic pump is quite noisy. Therefore, reducing the noise of the electronic pump is a technical problem to be considered.

[ invention ]

The invention aims to provide a stator assembly, which is beneficial to reducing the coaxiality tolerance of a pump shaft relative to a stator shell, so that the assembly performance of the stator assembly and a matched piece such as a rotor assembly is improved, and noise is reduced.

In view of this, an aspect of the present invention provides a stator assembly, the stator assembly including a stator winding, the stator winding including a stator core, an insulating frame, and a winding, the stator assembly further including a stator housing and a pump shaft, the stator housing being disposed on at least a portion of an outer surface of the stator winding, the stator housing including a partition portion including an inner portion and an inner bottom portion, the inner portion and the inner bottom portion forming a rotor cavity, the pump shaft including a mounting portion, a mating portion, and a positioning portion, the mating portion being in limited or fixed connection with the inner bottom portion, the mounting portion being at least partially located in the rotor cavity, the mating portion penetrating an upper surface of the inner bottom portion and a lower surface of the inner bottom portion, the positioning portion being at least partially protruding from an outer surface of the inner bottom portion.

On the other hand, the invention also provides an electronic pump, which comprises a pump housing, a rotor assembly and the stator assembly, wherein the rotor assembly is sleeved on the mounting part of the pump shaft, the rotor assembly comprises a permanent magnet and an impeller assembly, and the positioning part of the pump shaft and the pump housing are integrally injection molded.

In still another aspect, the present invention also provides a method for manufacturing an electronic pump, including the stator assembly as described above, including the steps of: providing a stator winding and a pump shaft, putting the stator winding and the pump shaft into a same side mold of an external injection mold as an insert, wherein the injection mold comprises a bottom part and a side part, at least part of the outer wall of the stator winding is in limit connection with the side wall of the side part, a first hole is formed in the bottom part, the pump shaft is provided with a positioning part, the positioning part is positioned in the first hole, the stator winding and the pump shaft are used as insert injection molding, injection molding materials are filled into an inner cavity of the injection mold, demolding is performed to form a stator shell of the stator assembly, the stator shell forms an inner bottom part and an inner side part in the injection molding process, the positioning part of the pump shaft protrudes out of the outer side surface of the inner bottom part to obtain the stator assembly, or providing the stator winding, placing the stator winding into an inner cavity of the external injection mold, the injection mold comprises a bottom and a side part, at least part of the outer wall of the stator winding is in limit connection with the side wall of the side part, a first shaft is arranged at the bottom, one end of the first shaft is fixedly connected or in limit connection with the bottom, the other end of the first shaft is at least partially positioned in an inner hole of the stator winding, the stator winding is used as an insert for injection molding, injection molding materials are filled into an inner cavity of the injection mold, a stator shell of the stator assembly is formed by demolding, the inner bottom and the inner side part are formed in the injection molding process, the inner bottom comprises a matching hole, a pump shaft is provided with a positioning part and a matching part, the matching part is arranged in the matching hole in a limit connection or fixed connection mode, and the positioning part protrudes out of the outer side surface of the inner bottom to obtain the stator assembly.

In the technical scheme of the application, the stator winding and the pump shaft are used as inserts for injection molding, the pump shaft comprises a positioning part, a matching part and a mounting part, the mounting part is at least partially positioned in the rotor cavity, the matching part penetrates through the upper surface and the lower surface of the inner bottom, and the positioning part is at least partially protruded out of the outer side surface of the inner bottom; or the stator winding is singly used as an insert for injection molding, the pump shaft is arranged in a matching hole formed by injection molding, the pump shaft and the stator winding can be arranged in a mold cavity on the same side, and the pump shaft and the inner bottom are integrally injection molded and connected in a sealing manner; or the pump shaft is arranged in the matching hole formed by injection molding, so that the coaxiality error of the pump shaft and the stator shell is reduced, the assembly performance of the stator assembly and a matched piece, such as a rotor assembly, is improved, and noise is reduced.

[ description of the drawings ]

FIG. 1 is a schematic diagram of one orientation of one embodiment of an electronic pump of the present application;

FIG. 2 is a schematic view of a cross-sectional A-A configuration of the electronic pump of FIG. 1;

FIG. 3 is a schematic illustration of one orientation of one embodiment of a stator assembly of the electronic pump of FIG. 1;

FIG. 4 is a schematic cross-sectional view of one embodiment of a stator assembly of the electronic pump of FIG. 2;

FIG. 5 is a schematic cross-sectional view of another embodiment of a stator assembly of the electronic pump of FIG. 2;

FIG. 6 is a schematic cross-sectional view of a third embodiment of a stator assembly of the electronic pump of FIG. 2;

FIG. 7 is a schematic cross-sectional view of a fourth embodiment of a stator assembly of the electronic pump of FIG. 2;

FIG. 8 is a schematic cross-sectional view of a fifth embodiment of a stator assembly of the electronic pump of FIG. 2;

FIG. 9 is a schematic cross-sectional view of a sixth embodiment of a stator assembly of the electronic pump of FIG. 2;

FIG. 10 is a schematic cross-sectional view of a seventh embodiment of a stator assembly of the electronic pump of FIG. 2;

[ detailed description ] of the invention

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

the following detailed description of specific embodiments of the present 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 they are relative concepts, so that they may be changed according to different positions and different usage states thereof. These and other directional terms should not be construed as limiting terms.

The electronic pump 100 in the following embodiment is capable of providing flow power to a working medium of an automotive thermal management system, which may be water or an aqueous solution, such as an aqueous solution including 50% glycol, although other materials are possible.

Referring to fig. 1 and 3, the electronic pump 100 includes a pump housing 12, a rotor assembly 11, a stator assembly 10, and a connection plate assembly 13, the pump housing 12 includes a motor housing 121 and an impeller cavity cover 122, the motor housing 121 includes an inner cavity, the stator assembly 10 divides the inner cavity into a first chamber 1211 and a second chamber 1212, which are not communicated with each other, the first chamber 1211 is capable of flowing a working medium therethrough, and the second chamber 1212 is not in direct contact with the working medium. The stator assembly 10 and the connection plate assembly 13 are located in the second chamber 1212, the stator assembly 10 includes a stator winding, the stator winding includes a stator core 102, an insulation frame 103 and a winding 101, the insulation frame 103 is disposed on at least a portion of a surface of the stator core 102, the winding 101 is wound on the insulation frame 103 and forms a stator winding, and the pump shaft 105 is disposed at least partially in an inner hole of the stator winding. The pump shaft includes a mounting portion 1052, a mating portion 1053, and a positioning portion 1051, the positioning portion 1051 being integrally injection molded with the pump housing 12. The rotor assembly 11 is sleeved on the outer periphery of the mounting portion 1052 of the pump shaft 105 and is located in the first chamber 1211, the rotor assembly 11 comprises a permanent magnet and an impeller assembly, and when the electronic pump 100 works, the rotor assembly 11 rotates around the pump shaft 105 or together with the pump shaft 105 under the action of the excitation magnetic field by controlling the excitation magnetic field generated by the stator assembly 10 through controlling the current passing through the stator windings of the stator assembly 10.

Referring to fig. 4, an insulation frame 103 is provided at least at a surface portion of the stator core 102, and the insulation frame 103 and the stator core 102 may be of a split structure, i.e., the insulation frame 103 is mounted at least at a surface portion of the stator core 102. The term "split arrangement" as used herein means that the insulator 103 and the stator core 102 are manufactured as two separate parts, respectively, and then assembled. The insulator 103 and the stator core 102 may be integrally formed. For example, the insulating frame 103 may also be coated on at least a surface portion of the stator core 102 by injection molding, for achieving electrical isolation between the winding 101 and the stator core 102. The winding wire 101 is wound on the surface of the insulating frame 103 to form a stator winding, the stator housing 104 is disposed on at least part of the outer surface of the stator winding, in this embodiment, the stator housing 104 is coated on part of the outer surface of the stator winding by injection molding, and in other embodiments, the stator housing is coated on all of the outer surface of the stator winding by injection molding. The stator housing 104 includes a spacer 1041, the spacer 1041 includes an inner side portion 1041a and an inner bottom portion 1041b, the inner side portion 1041a is disposed on a circumferential surface of an inner hole wall of the stator winding, the inner bottom portion 1041b is disposed at an end of an inner hole of the stator winding and forms a rotor cavity 1041c with the inner side wall 1041a, the pump shaft 105 includes a mounting portion 1052, a mating portion 1053 and a positioning portion 1051, the mounting portion 1052 is at least partially disposed in the rotor cavity 1041c, the mating portion 1053 is in limited connection or fixed connection with the inner bottom portion 1041b, the mounting portion 1052 is at least partially disposed in the rotor cavity 1041c, the mating portion 1053 penetrates through an upper surface of the inner bottom portion 1041b and a lower surface of the inner bottom portion, and the positioning portion 1051 is at least partially protruded out of an outer side surface of the inner bottom portion 1041 b. In a specific embodiment, the outer surface of the inner bottom is coplanar with the plane where the first end of the stator winding is located, defining a first reference plane 1001, the first reference plane 1001 is a plane where the lower surface of the inner bottom 1041b is located, the pump shaft 105 includes a mounting portion 1052, a mating portion 1053 and a positioning portion 1051, the mounting portion 1052 is at least partially located in the rotor cavity 1041c, the mating portion 1053 is in limited connection or fixed connection with the inner bottom 1041b, the mounting portion 1052 is at least partially located in the rotor cavity 1041c, the mating portion 1053 penetrates through the upper surface of the inner bottom 1041b and the lower surface of the inner bottom, and the positioning portion 1051 is at least partially protruding from the first reference plane 1001. In this embodiment, the pump shaft 105 and the stator winding are integrally injection molded to form at least a portion of the stator housing 104, and the mating portion 1053 is integrally injection molded to sealingly connect to the inner bottom 1041 b. In this manner, first, the stator windings and pump shaft 105 may be disposed in the same mold cavity as the stator assembly 10 is injection molded, it being understood that the stator windings and pump shaft 105 may be placed in either the upper mold cavity or the lower mold cavity at the same time. In this embodiment, the stator winding and the pump shaft 105 are simultaneously placed in the inner cavity of the lower die body, the inner cavity of the lower die body includes a first positioning hole and a second positioning hole, the first positioning hole is in spacing fit with the positioning portion 1051 of the pump shaft 105, the second positioning hole is in spacing fit with the stator winding, and it can be understood that the spacing fit is a clearance fit, an excessive fit or an interference fit. So, when processing the bed die, with the spacing complex second locating hole of stator winding and with the spacing complex first locating hole of location portion 1051 of pump shaft 105 can once clamping machine-shaping, like this, can effectively prevent the machining error that the secondary clamping brought, reduce the axiality error between pump shaft 105 and the stator winding, and then reduced the axiality error between rotor subassembly 11 and the stator subassembly 10, the electron pump is at the during operation, reduces rotor subassembly pivoted swing, and then reduces the noise of electron pump 100. Secondly, because the stator winding and the pump shaft 105 are placed in the inner cavity of the mold at the same side, when injection molding is carried out, a vertical injection molding machine can be selected to carry out injection molding, and the stator winding and the pump shaft 105 are subjected to injection molding on the vertical injection molding machine, so that multiple stations can work simultaneously, and the injection molding efficiency of the stator assembly 10 is improved.

As another embodiment, please refer to fig. 5, the stator winding is used as an insert to perform injection molding to form the stator housing 104, the stator housing 104 includes the isolation portion 1041, the isolation portion 1041 includes the inner bottom portion 1041b and the inner side portion 1041a, the inner bottom portion 1041b includes the mating hole 1041k, the pump shaft 105 is fixedly connected with the mating hole 1041k of the inner bottom portion, in this way, when the stator assembly 10 is injection molded, a mold core is further provided in the injection mold placed in the stator winding, the mold core is used for being formed in the mating hole 1041k, the mold core and the second positioning hole in limit fit with the stator winding can be subjected to one-time clamping and forming, thus, the machining error caused by secondary clamping can be effectively prevented, the coaxiality error between the pump shaft 105 and the stator winding is reduced, and the coaxiality error between the rotor assembly 11 and the stator assembly 10 is further reduced, and the swing of the rotor assembly is reduced, and the noise of the electronic pump 100 is further reduced. Of course, other embodiments are possible, such as the mating portion 1053 of the pump shaft 105 being in a positive connection with the mating bore, where the positive connection includes a clearance fit. The pump shaft 105 is fixedly connected to the rotor assembly, and the pump shaft 105 rotates with the rotor assembly 11 when the electronic pump is in operation.

Referring to fig. 4 again, the stator housing 104 further includes a winding coating portion 1042, the winding coating portion 1042 includes a first end portion 1042a and a second end portion 1042b, the first end portion 1042a is disposed on the stator winding end surface near the inner bottom portion 1041b, and the second end portion 1042b is disposed on the stator winding end surface far from the inner bottom portion 1041 b. The winding coating 1042 may be achieved by two-shot molding, but may of course also be achieved in other forms, for example by encapsulation of the stator winding. The pouring sealant comprises epoxy resin glue, organic silica gel or pouring sealant with other structures, and is not particularly limited herein. In this embodiment, the winding housing 1042 and the spacer 1041 are formed by one shot molding. In this way, electrical isolation between the windings and the stator core is achieved, and the process is simpler.

Referring to fig. 4 again, the stator housing 104 further includes a core coating portion 1044 and a flange portion 1043, the core coating portion 1044 is disposed on at least a portion of the outer peripheral surface of the stator winding, the flange portion 1043 is disposed along the circumferential outer surface of the core coating portion 1044, and the flange portion 1043 protrudes from the outer surface of the core coating portion. In the present embodiment, the flange portion 1043, the spacer portion 1041, and the winding cover 1042 are formed by one-shot injection molding, and the upper surface of the flange portion 1043 is in contact with the lower surface of the impeller cavity cover, and the fixed connection is achieved by welding, wherein the welding may be ultrasonic welding or laser welding, or may be other welding, and the welding is not particularly limited herein. In this way, there is no need to seal the volute chamber of the impeller chamber cover between the upper surface of the flange portion 1043 and the lower surface of the impeller chamber cover in a separate arrangement, reducing production costs.

Referring to fig. 6, a first plane 1002 is defined, the first plane 1002 is a plane where an end surface of the positioning portion 1051 is located, a distance between the first plane 1002 and the first reference plane 1001 is L1, a total length of the pump body is L0, and L1/L0 is greater than or equal to 0.27mm. In this way, the distance by which the positioning portion 1051 extends from the first reference surface 1001 is controlled within the above-described parameter range, and it is possible to ensure that the coaxiality error of the axial center line of the pump shaft 105 with respect to the axial center line of the stator assembly 10 is controlled within a range of 0.1mm or less. The rotor assembly is installed with the pump shaft 105 in a clearance fit mode, under the condition that the clearance between the inner hole side wall of the rotor assembly and the outer side wall of the pump shaft 105 is constant, the coaxiality error between the axial center line of the pump shaft 105 and the axial center line of the stator winding is controlled, so that the coaxiality error of the rotor assembly and the stator assembly is effectively reduced, the swing amplitude of the rotor assembly during rotation is further reduced, and the noise of the electronic pump is effectively reduced. Further, in order to make the electronic pump compatible with the features of compactness and low noise, the distance between the first plane 1002 and the first reference plane 1001 is L1, and the total length of the pump body is L0, where L1/L0 is 0.27mm or more and 0.30mm or less. The positioning shaft is disposed within the above range, and the coaxiality of the axial center line of the pump shaft 105 and the axial center line of the stator assembly 10 can be controlled within a reasonable range, without increasing the height of the entire electronic pump 100 in the axial direction due to the design of the positioning portion 1051. The electronic pump has the characteristics of compact structure and low noise. The axial height of the electronic pump 100 refers to the vertical distance from the bottom bulge point of the electronic pump housing to the end of the intake manifold of the impeller cavity cover.

Referring to fig. 6, the distance between the first plane 1002 and the first reference plane 1001 is L1, and the distance L1 is 45mm or more and 50mm or less. Through such a mode, the distance that the location portion 1051 protrudes out of the first reference surface 1001 is controlled in a reasonable range, and when guaranteeing that the electronic pump is compact in structure, the coaxiality error between the central axis of the pump shaft 105 and the stator assembly 10 can be effectively reduced, and then the coaxiality error between the rotor set and the stator assembly is reduced, so that the noise of the electronic pump is smaller, and the electronic pump has the characteristics of compact structure and smaller noise.

Referring to fig. 7, in one embodiment of the present application, the mounting portion 1052 includes a rotor mounting portion 1052a and a volute mounting portion 1052b, the rotor mounting portion 1052a is located between the volute mounting portion 1052b and the positioning portion 1051, and defines a second reference plane 1003, the second reference plane 1003 is a plane on which an outer surface of the second end 1042b is located, and the volute mounting portion 1052b protrudes from the second reference plane 1003; a second plane 1004 is defined, the second plane 1004 being a plane in which an end plane of the scroll mounting portion 1052b is located, a distance L2 between the second plane 1004 and the second reference plane 1003 being 5.3mm or more and 5.9mm or less. The distance between the end surface of the scroll housing mounting portion 1052b of the pump shaft 105 and the second reference surface 1003 is controlled within a certain range, the compact structure of the electronic pump is ensured, the contact area between the outer surface of the scroll housing mounting portion 1052b and the surface matched with the scroll housing mounting hole is increased as much as possible, the center of the scroll housing of the impeller cavity cover and the center of rotation of the impeller assembly are overlapped as much as possible, and the efficiency of the electronic pump is improved.

Referring to fig. 8, in another embodiment of the present application, an inner bottom portion 1041b includes an inner bottom portion upper portion, the inner bottom portion upper portion is located in a rotor cavity 1041c, an inner bottom portion 1041b of a partition portion 1041 includes a first flat plate portion 1041d, a rotor mounting portion 1052a includes a rotor limiting portion 1052c and a rotor supporting portion 1052d, the rotor supporting portion 1052d is disposed near the first flat plate portion 1041d, a radial direction dimension of the rotor supporting portion 1052d is larger than a radial direction dimension of the rotor limiting portion 1052c, a rotor assembly 11 includes a first rotor end 111 and a second rotor end 112, the first rotor end 111 is mounted near the rotor supporting portion 1052d, the second rotor end 112 is mounted far from the rotor supporting portion 1052d, and the rotor assembly 11 is sleeved on the rotor limiting portion 1052c with a predetermined gap between a surface of the first rotor end 111 and an upper surface of the rotor supporting portion 1052 d. More specifically, the rotor assembly 11 is provided with a through contact hole in the axial direction, the inner side surface of the contact hole is mounted in cooperation with the outer side surface of the rotor limit portion 1052c, as another implementation manner, a first bearing is mounted at one end of the contact hole of the rotor assembly 11, a second bearing is mounted at the other end of the contact hole of the rotor assembly 11, an inner hole of the first bearing and an inner hole of the second bearing are respectively matched with the outer wall of the rotor limit shaft, the first bearing is mounted close to the rotor support portion 1052d, and a preset clearance value exists between the lower end surface of the first bearing and the upper surface of the rotor support portion 1052 d. As another implementation manner, the mounting portion 1052 of the pump shaft 105 is configured to have a secondary shaft diameter, the pump shaft 105 can ensure that the radial dimension of the rotor limiting portion 1052c is smaller than the radial dimension of the rotor supporting portion 1052d by physically removing materials, and under the condition that the axial protrusion distance of the positioning portion 1051 from the first reference surface 1001 is ensured to be constant, the axial dimension of the rotor supporting portion 1052d is effectively controlled, the gap between the first end surface of the rotor assembly 11 and the upper surface of the rotor supporting portion 1052d can be better ensured, and the rotor supporting portion 1052d can effectively limit the rotor assembly 11 of the low-power electronic pump in the axial direction, so that the rotor assembly 11 of the low-power electronic pump is prevented from moving in the axial direction.

Referring to fig. 9, in another embodiment of the present application, an inner bottom portion 1041b includes an inner bottom portion upper portion, the inner bottom portion upper portion is disposed in a rotor cavity 1041c, the inner bottom portion upper portion includes a second flat plate portion 1041e and a protruding portion 1041f, the protruding portion 1041f protrudes from the second flat plate portion 1041e toward the rotor cavity 1041c, a mating portion penetrates through an upper surface and a lower surface of the protruding portion, the mating portion 1053 is connected with the inner bottom portion 1041b through integral injection molding, the positioning portion 1051 protrudes from an outer surface of the inner bottom portion, when the rotor assembly 11 is sleeved on the mounting portion 1052, the rotor assembly 11 includes a rotor main body portion 113 and a first rotor end portion 111, the first rotor end portion 111 is disposed at one end of the rotor main body portion 113, the first rotor end portion 111 includes a fourth flat plate portion, a first preset gap is disposed between the fourth flat plate portion and an upper surface of the protruding portion 1041f, or the first rotor end portion 111 further includes a first concave portion (not shown in the drawing), the first concave portion is protruded along the fourth flat plate portion protruding portion in the rotor main body portion direction, the first circumferential direction includes a first circumferential gap is disposed between the first concave portion and the first circumferential side portion, and the first circumferential side portion is disposed on the first circumferential side portion and the first circumferential side portion has a preset gap is disposed between the first concave portion and the first circumferential side portion and the first concave portion is disposed on the first side portion. In the present embodiment, the mounting portion 1052 and the positioning portion 1051 of the pump shaft 105 have the same size in the radial direction, and it is understood that the pump shaft 105 has an optical axis with the same diameter. More specifically, a cross section is formed along the direction of the center line of the pump shaft 105, and the dimension of the projection 1041f gradually decreases in the radial direction of the inner bottom 1041b toward the axial direction of the rotor assembly 11. In such a way, firstly, the rotor assembly 11 of the low-power electronic pump can be limited in the axial direction, so that the low-power electronic pump is prevented from moving in the axial direction; second, in injection molding, demolding is easier.

Referring to fig. 9 again, in another embodiment of the present application, the inner bottom portion 1041b further includes an inner bottom portion, the inner bottom portion is on the same side as the end of the positioning portion 1051, the inner bottom portion 1041b includes a third flat plate portion 1041g and a second concave portion 1041h, the second concave portion 1041h corresponds to the position of the protruding portion 1041f, the second concave portion 1041h is concave from the third flat plate portion 1041g to the rotor cavity 1041c, and the positioning portion 1051 extends from the concave portion 1041h and protrudes from the first reference surface 1001. More specifically, a section is formed along the direction of the central axis of the pump shaft 105, and the concave portion gradually increases between the inner bottom portion and the axial direction of the rotor assembly 11. In this way, when the injection mold is designed while ensuring the compact structure of the electronic pump, the depth of the external first positioning hole matched with the pump shaft 105 is deeper, and when the positioning portion 1051 of the pump shaft 105 is placed in the first positioning hole, the freedom degrees of the pump shaft 105 in four directions can be limited. Thus, the coaxiality precision of the pump shaft 105 and the stator assembly 10 can be effectively improved, the coaxiality precision of the rotor assembly 11 and the stator assembly 10 is further improved, the electronic pump 100 is ensured to be compact in structure, and meanwhile, the noise of the electronic pump is reduced.

Referring to fig. 10, in another embodiment of the present application, the pump shaft 105 is made of metal, the positioning portion 1051 further includes a ring groove portion 1051c, the ring groove portion 1051c is recessed along the outer side surface of the positioning portion 1051, the ring groove portion includes an upper sidewall, a lower sidewall and a bottom wall, and a plane of the upper sidewall is located below the first reference plane 1001 and has a predetermined gap from the first reference plane 1001. When the stator assembly 10 is subjected to secondary injection molding, the annular groove portion 1051c and the outer side surface of the positioning portion 1051 are coated with the injection molding body, and in this way, the pump shaft 105 and the injection molding body are formed into a whole after the secondary injection molding, so that the stability of the pump shaft 105 is increased. Further, the pump shaft 105 further includes a flattened portion 1051d, the flattened portion 1051d is disposed on an outer side surface of the positioning portion 1051, the flattened portion 1051d includes an anti-rotation surface, and a distance between the anti-rotation surface and a center line of the positioning portion 1051 is smaller than a distance between the outer side surface of the positioning portion 1051 and the center line of the positioning portion 1051. In this way, the pump shaft 105 can be effectively prevented from rotating in the circumferential direction.

One embodiment of the present application also provides a method of manufacturing an electronic pump, the electronic pump including a stator assembly, comprising the steps of: providing a stator winding and a pump shaft, putting the stator winding and the pump shaft into a same side mold of an external injection mold as an insert, wherein the injection mold comprises a bottom part and a side part, at least part of the outer wall of the stator winding is in limit connection with the side wall of the side part, a first hole is formed in the bottom part, the pump shaft is provided with a positioning part, the positioning part is positioned in the first hole, the stator winding and the pump shaft are used as insert injection molding, injection molding materials are filled into an inner cavity of the injection mold, demolding is performed to form a stator shell of the stator assembly, the stator shell forms an inner bottom part and an inner side part in the injection molding process, the positioning part of the pump shaft protrudes out of the outer side surface of the inner bottom part to obtain the stator assembly, or providing the stator winding, placing the stator winding into an inner cavity of the external injection mold, the injection mold comprises a bottom and a side part, at least part of the outer wall of the stator winding is in limit connection with the side wall of the side part, a first shaft is arranged at the bottom, one end of the first shaft is fixedly connected or in limit connection with the bottom, the other end of the first shaft is at least partially positioned in an inner hole of the stator winding, the stator winding is used as an insert for injection molding, injection molding materials are filled into an inner cavity of the injection mold, a stator shell of the stator assembly is formed by demolding, the inner bottom and the inner side part are formed in the injection molding process, the inner bottom comprises a matching hole, a pump shaft is provided with a positioning part and a matching part, the matching part is arranged in the matching hole in a limit connection or fixed connection mode, and the positioning part protrudes out of the outer side surface of the inner bottom to obtain the stator assembly. By the mode, coaxiality precision between the pump shaft and the stator winding is improved, swing amplitude of the rotor assembly during rotation is reduced, and noise of the electronic pump is effectively reduced.

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 technical solutions and modifications thereof without departing from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims (14)

1. The stator assembly comprises a stator winding, the stator winding comprises a stator core, an insulating frame and a winding wire, and is characterized by further comprising a stator shell and a pump shaft, the stator shell is arranged on at least part of the outer surface of the stator winding, the stator shell comprises an isolation part, the isolation part comprises an inner side part and an inner bottom part, the inner side part and the inner bottom part form a rotor cavity, the pump shaft comprises a mounting part, a matching part and a positioning part, the matching part is in limiting connection or fixed connection with the inner bottom part, the mounting part is at least partially positioned in the rotor cavity, the matching part penetrates through the upper surface of the inner bottom part and the lower surface of the inner bottom part, and the positioning part is at least partially protruded out of the outer side surface of the inner bottom part.

2. The stator assembly of claim 1, wherein: the pump shaft and the stator winding are integrally injection molded, at least part of the stator housing is integrally injection molded, and the matching part is integrally injection molded and connected with the inner bottom in a sealing manner.

3. The stator assembly of claim 1, wherein: the inner bottom comprises a matching hole, and the matching part of the pump shaft is in limit connection or fixed connection with the matching hole.

4. The stator assembly of claim 1 or 2, wherein: the inner bottom comprises an inner bottom upper portion and an inner bottom lower portion, the inner bottom upper portion is located in the rotor cavity, the inner bottom upper portion comprises a second flat plate portion and a protruding portion, the protruding portion protrudes from the second flat plate portion to the rotor cavity, the inner bottom lower portion further comprises a concave portion, the concave portion corresponds to the protruding portion in position, and the protruding portion is integrally injection-molded and sealed with the matching portion.

5. A stator assembly according to any one of claims 1-4, wherein: defining a first plane, wherein the first plane is a plane where the end surface of the positioning part is located, the distance between the first plane and the outer surface of the inner bottom is L1, the total length of the pump shaft is L0, and the L1/L0 is more than or equal to 0.27.

6. The stator assembly of claim 1, wherein: the stator housing further includes a winding cladding including a first end portion disposed on the stator winding end surface near the inner bottom side and a second end portion disposed on the stator winding end surface far from the inner bottom side.

7. The stator assembly of claim 6, wherein: the winding cladding portion and the isolation portion are integrally injection molded.

8. A stator assembly according to any one of claims 1-7, wherein: the stator housing further comprises an iron core coating portion and a flange portion, the iron core coating portion is arranged on at least part of the outer peripheral side surface of the stator winding, the flange portion is arranged along the circumferential outer surface of the iron core coating portion, and the flange portion protrudes out of the outer surface of the iron core coating portion.

9. The stator assembly of claim 6 or 7, wherein: the installation part comprises a rotor installation part and a volute installation part, the rotor installation part is positioned between the volute installation part and the matching part, a second datum plane is defined, the second datum plane is a plane where the surface of the second end part is positioned, and the volute installation part protrudes out of the second datum plane; defining a second plane, wherein the second plane is a plane where the end surface of the volute mounting part is located, the distance between the second plane and the second reference plane is L2, and the distance L2 is more than or equal to 5.3mm and less than or equal to 5.9mm.

10. A stator assembly according to any one of claims 1-9, wherein: the positioning part further comprises a ring groove part, the ring groove part is sunken along the outer side surface of the positioning part, the ring groove part comprises an upper side wall, a lower side wall and a bottom wall, the plane where the upper side wall is located below the outer side of the inner bottom, and a preset second gap is reserved between the plane and the outer side of the inner bottom.

11. A stator assembly according to any one of claims 1-10, wherein: the locating part still includes the flattening portion, the flattening portion sets up on the outside surface of locating part, the edging portion is including preventing the face of changeing, prevent changeing the face with the distance between the locating part central line is less than the outside surface of locating part with the distance between the locating part central line.

12. An electronic pump, characterized in that: the electronic pump comprises a pump housing, a rotor assembly and the stator assembly as claimed in any one of claims 1-10, wherein the rotor assembly is sleeved on the mounting part of the pump shaft, the rotor assembly comprises a permanent magnet and an impeller assembly, and the positioning part of the pump shaft and the pump housing are integrally injection molded.

13. An electronic pump according to claim 12, wherein: the inner bottom comprises an inner bottom upper portion and an inner bottom lower portion, the inner bottom upper portion is located in the rotor cavity, the inner bottom upper portion comprises a second flat plate portion and a protruding portion, the protruding portion protrudes from the second flat plate portion to the rotor cavity, the inner bottom lower portion further comprises a concave portion, the concave portion corresponds to the protruding portion in position, and the protruding portion is integrally injection-molded and sealed with the matching portion.

14. A method of manufacturing an electronic pump comprising the method of manufacturing a stator assembly according to any one of claims 1 to 11, comprising the steps of:

a stator winding and a pump shaft are provided,

the stator winding and the pump shaft are used as inserts to be placed into a same side mold of an external injection mold, the injection mold comprises a bottom and a side part, at least part of the outer wall of the stator winding is in limit connection with the side wall of the side part, a first hole is arranged at the bottom, the pump shaft is provided with a positioning part, the positioning part is positioned in the first hole,

the stator winding and the pump shaft are used as insert injection molding, the injection molding material is filled into the inner cavity of the injection mold,

demolding to form a stator housing of the stator assembly, wherein the stator housing forms an inner bottom and an inner side part in an injection molding process, and a positioning part of the pump shaft protrudes out of the outer side surface of the inner bottom to obtain the stator assembly, or,

a stator winding is provided which is arranged to be wound around the stator,

placing the stator winding into an inner cavity of an injection mold, wherein the injection mold comprises a bottom and a side part, at least part of the outer wall of the stator winding is in limit connection with the side wall of the side part, the bottom is provided with a first shaft, one end of the first shaft is fixedly connected or in limit connection with the bottom, the other end of the first shaft is at least partially positioned in the inner hole of the stator winding,

the stator winding is used as an insert for injection molding, the injection molding material is filled into the inner cavity of the injection mold,

demolding to form a stator housing of the stator assembly, and forming an inner bottom and an inner side of the stator housing during injection molding, the inner bottom including mating holes,

the pump shaft is provided with a positioning part and a matching part, the matching part is installed in the matching hole in a limiting connection or fixed connection mode, and the positioning part protrudes out of the outer side surface of the inner bottom to obtain the stator assembly.

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