Method for manufacturing electric pump, and electric pump

Abstract

The manufacturing method of the electric pump comprises the steps that a connecting plate assembly and a stator winding are assembled, so that the connecting plate assembly and the stator winding are electrically connected, and an assembly formed by combining the connecting plate assembly and the stator winding is defined as a first component; and preparing the motor assembly: at least taking the first part and the shaft as inserts to form a motor shell through injection molding. In this way, some independent parts such as installation of a shock pad can be reduced, the assembly steps of the electric pump can be simplified, and then the production cost of the electric pump can be reduced.

Description

[Technical field]

[0001] The present application relates to the field of fluid control, and in particular to an electric pump manufacturing method and an electric pump. [Background technology]

[0002] The electric pump includes multiple parts, each of which needs to be assembled. The process steps for assembling each part are relatively complicated and the production cost is high. How to simplify the assembly process steps of the electric pump and thus reduce the production cost of the electric pump is a technical problem that those skilled in the art need to consider. [Summary of the invention]

[0003] The object of the present invention is to provide a method for manufacturing an electric pump and an electric pump, which are helpful to simplify the assembly process steps of the electric pump and further help to reduce the production cost of the electric pump.

[0004] To achieve the above-mentioned purpose, an implementation method provided in the present application adopts the following technical solution: a manufacturing method of an electric pump comprises: assembling a connecting plate assembly and a stator winding so that the connecting plate assembly is electrically connected to the stator winding, and defining the assembly formed by combining the connecting plate assembly and the stator winding as a first component; preparing a motor assembly: at least using the first component and the shaft as inserts for injection molding to form a motor housing.

[0005] The present application also discloses an electric pump, which includes a motor assembly, which includes a connecting plate assembly, a stator winding, a shaft and a motor housing; the connecting plate assembly is electrically connected to the stator winding, and the assembly composed of the connecting plate assembly and the stator winding is defined as a first component; the motor housing is formed by injection molding with at least the first component and the shaft as inserts.

[0006] In one embodiment of the present application, the step of preparing the motor assembly includes: defining the assembly of the connecting plate assembly and the stator winding as the first component; forming the motor housing by injection molding at least with the first component and the shaft as inserts; defining the assembly of the first component, the shaft and the motor housing as the motor assembly. In this way, some individual parts can be reduced, such as the installation of the shock pad, which is conducive to simplifying the assembly steps of the electric pump, and further conducive to reducing the production cost of the electric pump.

Brief Description of the Drawings

[0007] Figure 1 It is a three-dimensional structural schematic diagram of a first embodiment of the electric pump of the present application;

[0008] Figure 2 yes Figure 1 A schematic diagram of an exploded structure of an electric pump;

[0009] Figure 3 yes Figure 1 A schematic diagram of the structure of the first embodiment of the electric pump along the XX section;

[0010] Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure of the motor assembly in one direction;

[0011] Figure 5 yes Figure 4 The schematic diagram of the motor assembly structure along the YY section;

[0012] Figure 6 yes Figure 5 The schematic diagram of the motor assembly along the ZZ section;

[0013] Figure 7 is a schematic flow chart of a step of a method for manufacturing an electric pump in a first embodiment;

[0014] Figure 8 yes Figure 1 A schematic diagram of the structure of the second embodiment of the electric pump along the XX section;

[0015] Fig. 9 yes Figure 8 A schematic diagram of the three-dimensional structure of the motor assembly in one direction;

[0016] Fig.10 yes Fig. 9 The schematic diagram of the motor assembly structure along the YY section;

[0017] Fig.11 is a schematic flow chart of a step of a method for manufacturing an electric pump in a second embodiment;

[0018] Fig.12 yes Figure 1 A schematic diagram of the structure of the third embodiment of the electric pump along the XX section;

[0019] Fig.13 yes Fig.12 A schematic diagram of the exploded structure of the first shell and the second shell in the electronic assembly;

[0020] Fig.14 yes Figure 1 A schematic diagram of the structure of the fourth embodiment of the electric pump along the XX section;

[0021] Fig.15 yes Fig.14 The enlarged structural diagram at position I in the middle;

[0022] Fig.16 is a schematic flow chart of a step of a method for manufacturing an electric pump in a third embodiment;

[0023] Fig.17 yes Figure 3 , Figure 8 , Fig.12 , Fig.14 A three-dimensional structural schematic diagram of an implementation method of a stator winding;

[0024] Fig.18 yes Figure 3 , Figure 8 , Fig.12 , Fig.14 A schematic diagram of a three-dimensional structure of an embodiment in which the middle connecting plate assembly is not installed to the stator winding;

[0025] Fig.19 yes Figure 3 , Figure 8 , Fig.12 , Fig.14 A three-dimensional structural schematic diagram of an implementation method of installing the middle connecting plate assembly to the stator winding;

[0026] Fig. 20 yes Fig.17 Schematic diagram of the structure of the middle section along WW;

[0027] Fig.21 is a schematic diagram of the three-dimensional structure of the first assembly in one direction;

[0028] Fig. 22 It is a schematic diagram of a three-dimensional structure in which a first assembly part and a limiting part are injection molded together;

[0029] Fig.23 It is a schematic diagram of the three-dimensional structure of a connection plate assembly formed after multiple conductive parts are disconnected in one direction;

[0030] Fig.24 It is a schematic diagram of a three-dimensional structure in which multiple conductive parts are split structures in one direction; in the accompanying drawings: 100, electric pump;

[0031] 11. Pump cover;

[0032] 12. Rotating assembly; 121. Impeller assembly; 122. Rotor assembly;

[0033] 13. Motor assembly; 131. Stator winding; 1311. Stator core; 1312. Insulation frame;

[0034] 1313, winding; 132, connecting plate assembly; 1321, stopper; 1322, conductive member; 1322a, plug pin; 1322b, main body; 1322c, power connection part; 1323, first assembly; 1324, connection part;

[0035] 133, shaft; 1331, fixed portion; 1332, rotating portion;

[0036] 134, motor housing; 1341, first housing; 1342, second housing;

[0037] 135, first component; 1351, first cavity; 1351a, bottom wall; 1351b, side wall;

[0038] 20, pump inner cavity; 141, rotor cavity; 1411, barrel; 1411a, rotor cavity bottom;

[0039] 1411b, rotor chamber side; 1412, extension portion; 1412, extension portion; 15, impeller chamber; 22, first component. [Specific implementation method]

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0041] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings. First of all, it should be noted that the directional terms such as up, down, left, right, front, back, inside, outside, top, bottom, etc. mentioned or may be mentioned in the specification of the present invention are defined relative to the structure shown in the corresponding drawings. They are relative concepts, and therefore may change accordingly according to their different locations and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0042] The electric pump 100 in the following embodiments can provide flow power for the working medium of the automobile thermal management system. The working medium may include a 50% ethylene glycol aqueous solution or clean water. Of course, the working medium may also be other substances.

[0043] Please refer to Figures 1 to 24As shown, the present application provides an electric pump 100 including a pump cover 11, a rotating assembly 12, and a motor assembly 13, wherein the motor assembly 13 includes a connecting plate assembly 132, a stator winding 131, a shaft 133, and a motor housing 134. The pump cover 11 and the motor assembly 13 are sealed and fixed. It should be noted that the sealing and fixing here means: when the electric pump 100 is working, the working medium is prevented from leaking to the outside of the electric pump 100. The shaft 133 is fixed to the motor housing 134 by injection molding. The electric pump 100 has a pump cavity 20, the rotating assembly 12 is located in the pump cavity 20, the pump cavity 20 includes a rotor cavity 141 and an impeller cavity 15, and the rotor cavity 141 is connected to the impeller cavity 15. The rotating assembly 12 includes a rotor assembly 122 and an impeller assembly 121, and the rotor assembly 122 includes a permanent magnet. At least part of the rotor assembly 122 is located in the rotor cavity 141, and the impeller assembly 121 is located in the impeller cavity 15, and the pump cavity 20 can have a working medium flowing through. In a specific embodiment, the other end of the shaft 133 is at least partially located in the rotor cavity 141, at least part of the rotating assembly 12 is sleeved on the outer periphery of the shaft 133, and the rotating assembly 12 is rotatably connected to the shaft 133. Of course, as other embodiments, the rotating assembly 12 and the shaft 133 are fixedly connected, and the shaft 133 rotates with the rotor assembly 122. The connecting plate assembly 132 includes a stopper 1321 and a conductive member 1322, the stopper 1321 is limitatively connected or fixedly connected to the stator winding 131, and the conductive member 1322 is limitatively connected or fixedly connected to the stopper 1321. Specifically, the conductive member 1322 is partially embedded in the stopper 1321, and the stopper 1321 is an injection molded part. The conductive member 1322 includes a pin 1322a, a main body 1322b and a power connection portion 1322c. The pin 1322a is electrically connected to the stator winding 131. As an implementation method, specifically, one end of the pin 1322a can pierce the enameled wire of the stator winding 131 to achieve electrical connection. The power connection portion 1322c can be used as a pin end when electrically connected to the external power supply of the electric pump 100. Of course, as other implementation methods, the electric pump 100 may not include the pump cover 11. The pump cover 11 is integrated into the external structure. For example, the pump cover 11 can be integrated on the flow channel plate. Such a setting is more conducive to the integrated design of the electric pump 100, making the structure of the electric pump 100 more compact, and more conducive to the miniaturization and lightweight of the structure of the electric pump 100. In this way, the parts of the electric pump 100 are reduced, which is conducive to simplifying the assembly route of the electric pump 100. When the electric pump 100 is working, the current of the stator winding 131 is controlled to thereby control the excitation magnetic field generated by the stator winding 131 , and the rotating assembly 12 rotates around the shaft 133 under the action of the excitation magnetic field.

[0044] See also Fig.17As shown, the stator winding 131 includes a stator core 1311, an insulating frame 1312 and a winding 1313, the number of windings 1313 is at least three, the insulating frame 1312 is coated on at least part of the surface of the stator core 1311, and the insulating frame 1312 is used to isolate the winding 1313 and the stator core 1311, so that the winding 1313 and the stator core 1311 are electrically insulated. The insulating frame 1312 and the stator core 1311 can be an integrated structural member. Specifically, as an implementation method, the insulating frame 1312 is formed by injection molding with the stator core 1311 as an insert. Of course, as other implementation methods, the insulating frame 1312 and the stator core 1311 are separately set, and the "separate setting" here means that the insulating frame 1312 and the stator core 1311 are respectively processed into two separate parts and then assembled. The connection is limited or fixed by assembly. In this embodiment, the insulating frame 1312 is formed by injection molding with the stator core 1311 as an insert. It can be understood that the stator core 1311 and the insulating frame 1312 are an integrated structure. The winding 1313 is wound around the insulating frame 1312. As a specific embodiment, the winding 1313 includes nine windings 1313. Of course, as other embodiments, the winding 1313 can also include other numbers of windings 1313, such as three, six, twelve, or other numbers.

[0045] In the prior art, the stator winding and the motor housing are separately arranged. Here, "separate arrangement" means that the stator winding and the motor housing are respectively processed into two separate parts and then assembled. In order to prevent the working medium from contacting the stator winding, in the prior art, the electric pump also includes an isolation sleeve, part of which is located in the inner hole of the stator winding. In order to reduce the axial movement of the stator winding, a shock-absorbing pad is arranged between the end of the stator winding and the upper end of the isolation sleeve along the axial direction of the electric pump. As mentioned above, the electric pump has many parts, the manufacturing process is relatively complicated, the assembly steps are relatively cumbersome, and the cost is relatively high. How to simplify the assembly steps of the electric pump is a technical problem.

[0046] Please refer to Figures 1 to 24As shown, as an implementation, the electric pump 100 includes a motor assembly 13, the motor assembly 13 includes a connecting plate assembly 132, a stator winding 131, a shaft 133 and a motor housing 134; the connecting plate assembly 132 is electrically connected to the stator winding 131, and the assembly of the connecting plate assembly 132 and the stator winding 131 is defined as the first component 22; at least the first component 22 and the shaft 133 are used as inserts to form the motor housing 134 by injection molding. The motor assembly 13 has a rotor cavity 141, part of the rotating assembly 12 is located in the rotor cavity 141, and the pump cover 11 is fixedly connected to the motor assembly 13. In this way, first, it is conducive to simplifying the structure of the electric pump 100, simplifying the assembly process steps of the electric pump 100, and then helping to reduce the production cost of the electric pump 100. Second, the motor housing 134 has a rotor cavity 141, and the motor housing 134 is integrated with the isolation sleeve function, which reduces the installation process of the isolation sleeve and helps to shorten the assembly steps of the electric pump 100. Third, since the motor housing 134 and the stator winding 131 are fixed by injection molding, it is not necessary to set a shock-absorbing pad component at the end of the stator winding 131, thereby reducing the number of components and laying a certain foundation for reducing the production cost of the electric pump 100.

[0047] The motor housing 134 can be formed by injection molding with the first component 22 and the shaft 133 as inserts. The assembly formed by the injection molding of the first component 22 and the shaft 133 is the motor assembly 13. As an implementation method, please refer to Figures 1 to 7 as well as Fig.17 , Fig. 20 As shown, the motor assembly 13 has a rotor cavity 141, and the motor assembly 13 includes a rotor cavity bottom 1411a and a rotor cavity side 1411b. The rotor cavity bottom 1411a is located at one end of the rotor cavity side 1411b, and the shaft 133 is fixed to the rotor cavity bottom 1411a by injection molding. The wall corresponding to the rotor cavity side 1411b includes a wall 1311b corresponding to a part of the inner hole of the stator winding 131 and a part of the motor housing 134. Please refer to Fig. 20 As shown, the stator winding 131 includes a stator core 1311, the stator core 1311 has a stator slot 1311a, a part of the winding 1313 is located in the stator slot 1311a, and the stator winding 131 has an inner hole 1311c, and the stator slot 1311a is connected to the inner hole 1311c. The above-mentioned "part of the motor housing 134" refers to the injection material portion filled in the stator slot 1311a. At least part of the rotor assembly 122 is located in the rotor cavity 141. In this way, no part of the motor housing is set between the rotor assembly 122 and the inner hole 1311c of the stator winding 131, which is conducive to reducing the gap between the rotor assembly 122 and the stator winding 131, thereby facilitating the enhancement of the magnetic field strength between the stator winding 131 and the rotor assembly 122, thereby facilitating the improvement of the output power of the electric pump 100.

[0048] Please refer to Figures 1 to 7 , Fig.17 and Fig. 20 As shown, the working medium can flow in the rotor cavity 141. In order to reduce the corrosion of the working medium on the stator core 1311 in the stator winding 131, the stator core 1311 can be made of corrosion-resistant materials. That is to say, if a corrosion-resistant stator core 1311 is selected, the inner wall surface 1311b of the stator core 1311 can be unprotected. Of course, as another implementation method, the stator core 1311 is made of conventional materials. In order to reduce the corrosion of the stator core 1311 in the stator winding 131 by the working medium, a protective material can be provided on the wall corresponding to the inner hole 1311c of the stator winding 131 to protect the inner hole of the stator winding 131 from the corrosion of the working medium. As for the protective material, as an implementation method, the above-mentioned protective material includes three-proof paint and epoxy resin. The three-proof paint covers the wall corresponding to the inner hole of the stator winding 131, which is conducive to reducing the protection of the stator core 1311 exposed to the outside by the working medium. It should be noted that the stator core 1311 exposed to the outside here refers to the part that is not covered by the motor housing 134. The above-mentioned injection molding method for forming the motor housing 134 can be formed by one injection molding or two injection molding, that is to say, there is no specific limitation on the number of injection molding. For the protective material, as an implementation method, other materials with waterproof and rust-proof functions are also possible, and the above two materials are only given as examples here. If the protective material used is epoxy resin, the motor component coated with the protective material is heat-cured to cure the protective material. Of course, the motor component coated with the protective material can also be cold-cured to cure the protective material. It should be noted that the heat curing here refers to heating the protective material to a preset temperature and then curing the protective material. The cold curing here refers to the curing of the protective material at room temperature (23°C ± 1°C). The three-proof paint at least covers the wall corresponding to the inner hole of the stator winding 131, which is conducive to reducing the protection of the stator core 1311 exposed to the outside by the working medium.

[0049] Of course, as a way to implement it, please refer to Figures 1 to 7 , Fig.17 as well as Fig. 20As shown, the stator winding 131, the connecting plate assembly 132, and the shaft 133 are used as inserts to form a motor housing 134 by one injection molding. The motor assembly 13 has a rotor cavity 141, and the wall surface corresponding to the rotor cavity 141 includes the wall portion corresponding to the inner hole 1311c of the stator winding 131 and part of the motor housing 134. Here, part of the motor housing 134 can be understood as the part located in the stator slot 1311a. In order to simplify the difficulty of manufacturing, the wall surface corresponding to the rotor cavity 141 can be coated with protective material. In this way, first, while improving the power of the electric pump 100, it is helpful to simplify the process manufacturing method of the electric pump 100, and then it is helpful to reduce the cost of the electric pump 100. The injection mold for forming the motor housing 134 by injection molding includes a positioning shaft for positioning with the wall portion corresponding to the inner hole 1311c of the stator winding 131. In this way, secondly, since the shaft 133 and the stator winding 131 are simultaneously injection molded as inserts, the coaxial accuracy of the shaft 133 and the stator winding 131 can be improved, thereby reducing the noise of the electric pump 100. Thirdly, the motor housing 134 is formed by one-time injection molding, that is, the motor housing 134 requires a set of injection molds, which is conducive to reducing the production cost of the electric pump 100. Fourthly, the protective material is applied to all the walls corresponding to the rotor cavity 141, which is conducive to sealing the rotor cavity 141.

[0050] Please refer to the picture Figures 3 to 7 as well as Fig.17 , Fig. 20 As shown, the stator core 1311 has a stator slot 1311a. Please refer to the figure, the winding 1313 is located in the stator slot 1311a. During injection molding, the stator slot 1311a will be filled with injection molding material, and the position where the stator core 1311 is located will not be filled with injection molding material, so that along the circumferential direction of the stator winding 131, the size and thickness of the motor housing 134 in the radial direction are different. It can be understood that some places have more injection molding material and some places have less injection molding material. For details, please refer to Figure 6 As shown. When the motor assembly 13 is cooled after injection molding, the motor housing 134 has different dimensional thicknesses in the radial direction and different shrinkage rates, which makes it easy for cracks to appear on the wall corresponding to the rotor cavity 141. Since the working medium can flow through the wall corresponding to the rotor cavity 141, the working medium can easily leak through the cracks, increasing the defective rate of the product. In order to reduce the occurrence of the above cracks, the motor housing 134 is formed by two injection moldings, that is, injection molding is performed by two sets of injection molds.

[0051] As an implementation, see Figure 1 , Figure 2 , Figures 12 to 16As shown, the motor housing includes a first housing 1341 and a second housing 1342. The first housing 1341 is formed by injection molding with the connecting plate assembly 132, the stator winding 131, and the shaft 133 as inserts. It can be understood that the first housing 1341 is formed by injection molding with the first component 22 and the shaft 133 as inserts. An injection mold is used in the injection molding process to define a first component 135. The first component 135 includes the connecting plate assembly 132, the stator winding 131, the first housing 1341, and the shaft 133. The first component 135 has a first cavity 1351. The wall portion corresponding to the first cavity 1351 includes a bottom wall 1351a and a side wall 1351b. The first housing 1341 includes a bottom wall 1351a, and a portion of the shaft 133 is fixed to the bottom wall 1351a by injection molding. The first housing 1341 covers a portion of the stator winding 131 and a portion of the connecting plate assembly 132. Specifically, the first component 135 includes a positioning portion, and the positioning portion includes a supporting portion and a limiting portion, the supporting portion is located at the end of the stator core 1311, and the limiting portion is located at the outer peripheral side of the stator core 1311. During the first injection molding, the supporting portion and the limiting portion cooperate as a positioning reference during injection molding. Other parts except the positioning portion and the inner wall surface of the stator core 1311 are located in the first shell 1341. It can be understood that the first shell 1341 isolates other parts except the positioning portion and the inner wall surface of the stator core 1311 from the air. The second housing 1342 is formed by injection molding with the first component 135 as an insert. The second housing 1342 includes a barrel 1411, and the barrel 1411 includes a rotor cavity side portion 1411a. Along the radial direction of the electric pump 100, the rotor cavity side portion 1411b is located radially inside the side wall 1351b, and the rotor cavity side portion 1411b contacts the side wall 1351b, and the rotor cavity side portion 1411b is fixed to the side wall 1351b by injection molding. Along the direction of the axis 133 of the electric pump 100, the rotor cavity side portion 1411b extends to the bottom wall 1351a, and the rotor cavity side portion 1411b is fixed to the bottom wall 1351a by injection molding. The wall portion corresponding to the rotor cavity 141 includes a rotor cavity side portion 1411b and a rotor cavity bottom portion 1411a. The rotor cavity side portion 1411b is formed in the second housing 1342, and the rotor cavity bottom portion 1411b is formed in the first housing 1341. In this way, since the shaft 133 and the stator winding 131 are placed in the injection mold B at the same time when they are injected as inserts, the stator winding 131 and the shaft 133 are respectively located in different injection molding steps, which is conducive to improving the coaxial accuracy of the shaft 133 and the stator winding 131, and further conducive to reducing the noise of the electric pump 100. For the convenience of the following description, this embodiment is defined as the first embodiment.

[0052] For further information, please refer to Figures 12 to 16As shown, in order to reduce the leakage of the working medium along the contact surface between the side and bottom of the rotor cavity 141, as an implementation method, the cylinder 1411 includes a rotor cavity bottom 1411a, and the rotor cavity bottom 1411a extends from the rotor cavity side 1411b to the direction of the shaft 133 along the radial direction of the electric pump 100. The rotor cavity bottom 1411a does not cover the bottom wall 1351a. The rotor cavity bottom 1411a includes a first bottom surface 1411c and a second bottom surface 1411d. In the axial direction of the pump 100, the first bottom surface 1411c is away from the rotating assembly 12 relative to the second bottom surface 1411d, and the electric pump 100 includes a labyrinth 21, and the labyrinth 21 includes a protrusion 211 and a recess 212, one of which is located at the bottom 1411a of the rotor cavity, and the other of which is located at the first housing 1341, and the protrusion 211 and the recess 212 are limitedly matched. As an implementation method, the protrusion 211 protrudes from the upper surface of the bottom wall 1351a in a direction away from the upper surface of the bottom wall 1351a, and the recess 212 is recessed from the first bottom surface 1411c in a direction close to the second bottom surface 1411d, and the protrusion 211 and the recess 212 are fixed by injection molding. In this way, the contact area between the rotor chamber bottom 1411a and the bottom wall 1351a is increased, thereby reducing the leakage of the working medium in the rotor chamber 141. More specifically, the electric pump 100 may include a plurality of labyrinths 21. For the convenience of the following description, this embodiment is defined as the second embodiment.

[0053] As an implementation, see Figures 8 to 11 As shown, the motor housing 134 includes a first housing 1341 and a second housing 1342. The first housing 1341 is formed by injection molding with the connecting plate assembly 132 and the stator winding 131 as inserts, and a first component 135 is defined. The first component 135 includes the connecting plate assembly 132, the stator winding 131 and the first housing 1341; the second housing 1342 is formed by injection molding with the first component 135 and the shaft 133 as inserts. The first housing 1341 and the second housing 1342 are fixed by injection molding, and part of the shaft 133 is fixed by injection molding with the second housing 1342. The first component 135 has a first cavity 1351, and the wall portion corresponding to the first cavity 1351 includes a bottom wall 1351a and a side wall 1351b. The second housing 1342 includes a barrel 1411 and an extension 1412. Specifically, the barrel 1411 includes a rotor cavity bottom 1411a and a rotor cavity side 1411b. The wall portion corresponding to the rotor cavity 141 includes a rotor cavity bottom 1411a and a rotor cavity side 1411b.

[0054] 1411b, the rotor chamber bottom 1411a is located on one side of the rotor chamber side 1411b, the rotor chamber bottom 1411a is located on the upper side of the bottom wall 1351a, the rotor chamber bottom 1411a is in contact with the bottom wall 1351a, the rotor chamber bottom 1411a covers the bottom wall 1351a, and the rotor chamber bottom 1411a and the bottom wall 1351a are fixed by injection molding. Along the radial direction of the electric pump 100, the extension 1412 is arranged on the radial outer side of the barrel 1411, specifically, the wall corresponding to the impeller chamber 15 includes the extension 1412, the electric pump 100 has a pump inner cavity 20, and part of the shaft 133 is fixed by injection molding to the rotor chamber bottom 1411a. When the electric pump 100 is working, the pump inner cavity 20 can flow the working medium, and the wall corresponding to the pump inner cavity 20 includes the barrel 1411 and the extension 1412. In this way, first, the material of one injection molding is divided into two injection moldings to reduce the amount of single feeding, which is beneficial to reduce the cracks in the wall corresponding to the rotor cavity 141, and is beneficial to improve the injection molding quality of the motor housing 134. Second, when the electric pump 100 is working, there is working medium in the rotor cavity 141 and the impeller cavity 15. During the second injection molding, the wall surface corresponding to the rotor cavity 141 and the wall surface corresponding to the impeller cavity 15 are formed at the same time. The relative extension 1412 and the wall surface corresponding to the rotor cavity 141 can be understood that the rotor cavity bottom 1411a and the rotor cavity side 1411b are not in the same injection molding step, reducing the direct joint surface between the extension and the rotor cavity side 1411b, thereby reducing the risk of leakage of the working medium in the rotor cavity 141 and the impeller cavity 15 through the above-mentioned joint surface. For the convenience of the following description, this embodiment is defined as the third embodiment.

[0055] For further information, please refer to Figures 8 to 11 As shown, in order to increase the structural strength of the second housing 1342, the inner wall surface of the side wall 1351b includes the inner wall surface of the stator core 1311. Specifically, the first component 135 includes a positioning portion, the positioning portion includes a support portion and a limit portion, the support portion is located at the end of the stator core 1311, and the limit portion is located at the outer peripheral side of the stator core 1311. During the first injection molding, the support portion and the limit portion cooperate as a positioning reference during injection molding. The first housing 1341 covers other parts except the positioning portion and the inner wall 1351b surface of the stator core 1311. It can be understood that the first housing 1341 isolates other parts except the positioning portion and the inner wall surface of the stator core 1311 from the air. In this way, while ensuring a smaller magnetic air gap between the stator core 1311 and the rotor assembly 122, it is beneficial to improve the strength of the side of the rotor cavity 141.

[0056] As an implementation, see Figures 8 to 16As shown, the first component 135 formed with at least the stator winding 131 as the insert and part of the injection mold are not demolded and enter the next injection molding step. In the next injection molding step, at least the first component 135 and the shaft 133 are injection molded as inserts, and the first component 135 formed with at least the stator winding 1313 as the insert and part of the injection mold may not be demolded, thereby reducing the positioning error caused by repeated clamping of the first component 135 as an insert and the injection mold, which is beneficial to reducing the coaxial accuracy of the shaft 133 and the stator winding 131. For the convenience of description, the injection mold is defined to include a first mold. The mold used for the first injection molding is the first mold. After the first injection molding is completed, part of the mold in the first mold needs to be demolded. The second component is located in the first mold. During the second injection molding, part of the first mold B and the second mold are used in conjunction to complete the second injection molding. In this way, during the second injection molding, at least when the shaft 133 is used as an insert, the same positioning reference is used when positioning the stator core 1311 in the second injection molding and the first injection molding, which is beneficial to reduce the positioning error between the first component 135 and the second mold, thereby improving the coaxiality between the shaft 133 and the stator core 1311.

[0057] To further simplify the manufacturing and assembly steps of the electric pump 100 , the first mold and the second mold required in the three embodiments of the motor housing 134 formed by two injection molding can be placed in the same station to complete the injection molding of the motor housing 134 .

[0058] Please refer to Figures 1 to 24 As shown, the present application also discloses a method for manufacturing an electric pump 100, assembling a connecting plate assembly 132 and a stator winding 131 so that the connecting plate assembly 132 and the stator winding 131 are electrically connected, defining the assembly of the connecting plate assembly 132 and the stator winding 131 as the first component 22; preparing a motor assembly 13, at least using the first component 22 and the shaft 133 as inserts to form a motor housing 134 by injection molding; defining the assembly of the first component 22, the shaft 133 and the motor housing 134 as the motor assembly 13. In this way, first, it is conducive to simplifying the manufacturing process of the electric pump 100, simplifying the assembly steps of the electric pump 100, and thus helping to reduce the production cost of the electric pump 100. Second, the motor housing 134 has a rotor cavity 141, and the motor housing 134 is integrated with the function of an isolation sleeve, which reduces the installation process of the isolation sleeve, and helps to shorten the manufacturing process of the electric pump 100. Third, since the motor housing 134 is fixed to the stator winding 131 by injection molding, it is not necessary to set a shock-absorbing pad component at the end of the stator winding 131, reducing the number of components and laying a certain foundation for reducing the production cost of the electric pump 100. Further, the rotor cavity 141 is formed by injection molding with at least the first component 22 and the shaft 133 as inserts.

[0059] Please refer to Figures 8 to 24As shown, the present application also discloses a method for manufacturing the electric pump 100, including: the step of preparing the motor assembly 13" includes: using the first component 22 as an insert to form a first shell 1341 by injection molding, defining the first component 22 and the first shell formed by the combination of the first component 22 as a first component 135; using the first component 135 and the shaft 133 as an insert to form a second shell 1342 by injection molding; forming a rotor cavity 141 in the second shell 1342. The motor assembly 13 is formed by two injection moldings, which reduces the single feed amount and is conducive to improving the injection molding quality of the second shell 1342.

[0060] As another implementation, see Figures 12 to 16 As shown, the step of "preparing the motor assembly 13" includes: using the first component 22 and the shaft 133 as inserts to form the first housing 1341 by injection molding; defining the first component 22, the shaft 133 and the first housing 1341 as a first component 135'; forming the rotor cavity bottom 1411a in the first housing 1341, using the first component 135' as an insert to form the second housing 1342 by injection molding, and forming the rotor cavity side 1411 in the second housing 1342. In this way, the motor assembly 13 is formed by two injection moldings, which reduces the single feed amount, is conducive to improving the injection molding quality of the rotor cavity 141 side wall 1351b of the second housing 1342, and reduces the risk of leakage of the working medium in the rotor cavity 141.

[0061] Please refer to Figures 12 to 16 As shown, in order to improve the coaxiality 133 accuracy of the shaft 133 and the stator winding 131, the manufacturing method of the electric pump 100 includes: forming the first component 135 and part of the injection mold without demolding to enter the next injection molding step, and in the next injection molding step, at least the first component 135 is used as an insert for injection molding. Reducing the positioning error caused by repeated clamping of the first component 135 as an insert and the injection mold is conducive to reducing the coaxiality 133 accuracy of the shaft 133 and the stator winding 131. For the convenience of description, the injection mold is defined to include a first mold. The mold used in the first injection molding is the first mold. After the first injection molding is completed, part of the mold in the first mold needs to be demolded. The second component is located in the first mold. During the second injection molding, part of the first mold and the second mold are used in combination to complete the second injection molding. In this way, during the second injection molding, at least when the shaft 133 is used as an insert, the same positioning reference is used when positioning the stator core 1311 in the second injection molding and the first injection molding, which is beneficial to reduce the positioning error between the first component 135 and the second mold, thereby improving the coaxial accuracy between the shaft 133 and the stator winding 131.

[0062] Please refer to Figures 1 to 7As shown, the present application also discloses a method for manufacturing an electric pump 100, and the step of "preparing a motor component 13" includes: using the inner wall of the stator winding 131 as the positioning reference surface 101 to cooperate with the injection mold; installing the first component 22 and the shaft 133 to the injection mold, and using the first component 22 and the shaft 133 as inserts to form a motor housing 134 by injection molding; demolding; applying a protective material to the positioning reference surface 101, so that the protective material at least covers the positioning reference surface 101. In this way, it is beneficial to reduce the magnetic gap between the rotor component 122 and the stator winding 131, and then it is beneficial to improve the output power of the electric pump 100. Further, using the first component 22 and the shaft 133 as inserts to form a rotor cavity 141 including the positioning reference surface 101 by injection molding; applying epoxy resin to the wall corresponding to the rotor cavity 141; and heat curing or cold curing the epoxy resin. The rotor cavity 141 including the positioning reference surface 101 is formed by injection molding with the first component 22 and the shaft 133 as inserts; conformal coating is applied to the wall corresponding to the rotor cavity 141; and the conformal coating is cured. As an implementation method, the rotor cavity 141 including the positioning reference surface 101 is formed by injection molding with the first component 22 and the shaft 133 as inserts; conformal coating is applied to the wall corresponding to the rotor cavity 141; and the conformal coating is cured. In this way, it is helpful to reduce the corrosion of the working medium in the rotor cavity 141 to the stator core 1311, which is helpful to increase the service life of the electric pump.

[0063] Please refer to Figures 1 to 24 As shown, the electric pump 100 includes a connecting plate assembly 132 including a conductive member 1322 and a stopper 1321. The manufacturing method of the electric pump 100 includes: at least the conductive member 1322 is used as an insert for injection molding to form the stopper 1321. In this way, first, the conductive member 1322 is supported and limited by the stopper 1321, which is conducive to reducing the deformation of the conductive member 1322, and further conducive to reducing the injection pressure of the conductive member 1322 during the injection molding process of the motor assembly 13, and reducing the risk of electrical connection failure of the conductive member 1322. Second, the conductive member 1322 is supported and limited by the stopper 1321, and the structure of the connecting plate assembly 132 cooperating with the stator winding 131 can be set on the stopper 1321. Compared with directly setting the above-mentioned cooperating structure on the conductive member 1322, it is more conducive to facilitating the production and manufacturing of the electric pump 100.

[0064] Please refer to Figures 1 to 24As shown, the electric pump 100 includes a plurality of conductive members 1322, and the manufacturing method of the electric pump 100 includes: providing a conductive raw material for forming the conductive member 1322; processing the conductive raw material to form a first assembly 1323, the first assembly 1323 includes a plurality of conductive members 1322 and a connecting portion 1324, and the plurality of conductive members 1322 are connected to form an integrated structure through the connecting portion 1324; using the first assembly 1323 as an insert for injection molding to form a stopper 1321; disconnecting the connecting portion 1324 connecting the plurality of conductive members 1322, so that the plurality of conductive members 1322 are not connected to each other. In this way, first, during the injection molding of the connecting plate, the plurality of conductive members 1322 form an integrated structure through the connecting portion 1324, and when the connecting plate assembly 132 is injected, the positioning structure of the conductive member 1322 is simpler, which is conducive to simplifying the injection mold. Second, during the injection molding process of the connecting plate, the integrated structure formed by the plurality of conductive members 1322 through the connecting portion 1324 is conducive to reducing the deformation of the conductive members 1322 .

[0065] Please refer to Fig.24 As shown, as another implementation, the manufacturing method of the electric pump 100 includes: providing a conductive raw material for forming a conductive member 1322; processing the conductive raw material to form a first assembly 1323, wherein the first assembly 1323 includes a plurality of conductive members 1322, and the plurality of conductive members 1322 are not connected to each other; and using the first assembly 1323 as an insert for injection molding to form a stopper 1321. In this way, there is more room for selection of the conductive raw material, which lays a certain foundation for reducing the cost of the connecting plate assembly 132.

[0066] Please refer to Figures 1 to 24 As shown, the conductive member 1322 includes a pin 1322a, a main body 1322b and a power connection part 1322c, and the manufacturing method of the electric pump 100 includes: stamping to form the first assembly 1323, the first assembly 1323 includes a plurality of the conductive members 1322, the pin 1322a, the main body 1322b and the power connection part 1322c are an integrated structural member. In this way, the number of parts is reduced and the assembly steps of parts are reduced.

[0067] Please refer to Figures 1 to 24As shown, as an implementation, the electric pump 100 includes a rotating assembly 12, the rotating assembly 12 includes a rotor assembly 122 and an impeller assembly 121; the electric pump 100 has a pump inner cavity 20, and the manufacturing method of the electric pump 100 includes: forming the rotating assembly 12; assembling the rotating assembly 12 to the pump inner cavity 20. The pump inner cavity 20 includes a rotor cavity 141 and an impeller cavity 15, the rotor cavity 141 and the impeller cavity 15 are connected, the pump inner cavity 20 can flow the working medium, the rotating assembly 12 to the pump inner cavity 20, specifically, at least part of the rotor assembly 122 is located in the rotor cavity 141, and the impeller assembly 121 is located in the impeller cavity 15.

[0068] As an implementation, see Figures 1 to 24 The electric pump 100 shown includes a pump cover 11, and the manufacturing method of the electric pump 100 includes: forming the pump cover 11; the pump cover 11 is an injection molded part, and welding the pump cover 11 and the second housing 1342. In this way, the fixed structural parts connecting the pump cover 11 and the stator assembly and the sealing structural parts at the connection between the pump cover 11 and the stator assembly are reduced, which is conducive to reducing the production cost of the electric pump 100.

[0069] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for manufacturing an electric pump (100), characterized in that: The manufacturing method of the electric pump (100) comprises: Assembling a connection plate assembly (132) and a stator winding (131) so that the connection plate assembly (132) and the stator winding (131) are electrically connected, and defining the assembly of the connection plate assembly (132) and the stator winding (131) as a first component (22); The motor assembly (13) is prepared by injection molding at least the first component (22) and the shaft (133) as inserts to form a motor housing (134).

2. The method for manufacturing the electric pump (100) according to claim 1, characterized in that The step of "preparing a motor component (13)" comprises: A rotor cavity (141) is formed by injection molding at least with the first component (22) and the shaft (133) as inserts.

3. The method for manufacturing the electric pump (100) according to claim 2, characterized in that: The step of "preparing a motor assembly (13)" comprises: The first shell (1341) is formed by injection molding using the first component (22) as an insert, and a component formed by combining the first component (22) and the first shell is defined as a first assembly (135); The second shell (1342) is formed by injection molding with the first component (135) and the shaft (133) as inserts; and the rotor cavity (141) is formed in the second shell (1342).

4. The method for manufacturing the electric pump (100) according to claim 2, characterized in that: The step of "preparing a motor assembly (13)" comprises: The first housing (1341) is formed by injection molding with the first component (22) and the shaft (133) as inserts; a component formed by combining the first component (22), the shaft (133) and the first housing (1341) is defined as a first assembly (135'); a rotor cavity bottom (1411a) is formed in the first housing (1341), The second shell (1342) is formed by injection molding with the first component (135') as an insert, and a rotor cavity side portion (1411) is formed on the second shell (1342).

5. The method for manufacturing the electric pump (100) according to claim 3 or 4, characterized in that: The step of "preparing a motor assembly (13)" comprises: The first component (135, 135') and part of the injection mold are not demoulded and enter the next injection molding step. In the next injection molding step, at least the first component (135, 135') is used as an insert for injection molding.

6. The method for manufacturing the electric pump (100) according to claim 1, characterized in that: The step of "preparing a motor assembly (13)" comprises: Using the inner side wall of the stator winding (131) as a positioning reference surface (101) to cooperate with the injection mold; Installing the first component (22) and the shaft (133) to the injection mold, and using the first component (22) and the shaft (133) as inserts to form the motor housing (134) by injection molding; Demolding; A protective material is applied to the positioning reference surface (101), so that the protective material at least covers the positioning reference surface (101).

7. The method for manufacturing the electric pump (100) according to claim 6, characterized in that: Using the first component (22) and the shaft (133) as inserts, injection molding is performed to form a rotor cavity (141) including the positioning reference surface (101); Applying epoxy resin to the wall portion corresponding to the rotor cavity (141); The epoxy resin is heat cured or cold cured.

8. The method for manufacturing the electric pump (100) according to claim 6, characterized in that: Using the first component (22) and the shaft (133) as inserts, injection molding is performed to form a rotor cavity (141) including the positioning reference surface (101); Applying conformal coating to the wall portion corresponding to the rotor cavity (141); The conformal coating is cured.

9. The method for manufacturing the electric pump (100) according to any one of claims 1 to 8, characterized in that: The connecting plate assembly (132) is prepared by injection molding at least using the conductive member (1322) as an insert to form a limiting member (1321).

10. The method for manufacturing the electric pump (100) according to claim 9, characterized in that: The manufacturing method of the electric pump (100) comprises: Providing a conductive raw material for forming the conductive member (1322); Processing the conductive raw material to form an integrated first assembly (1323) including a plurality of conductive parts (1322) and a connecting part (1324); The limiting component (1321) is formed by injection molding using the first assembly component (1323) as an insert; The connection portion (1324) between the plurality of conductive members (1322) is disconnected, so that the plurality of conductive members (1322) are not connected to each other.

11. The method for manufacturing the electric pump (100) according to claim 9 or 10, characterized in that: The conductive member (1322) comprises a pin (1322a), a main body (1322b) and a power connection portion (1322c). The manufacturing method of the electric pump (100) comprises: The first assembly (1323) is formed by stamping to form the conductive member (1322) including a pin (1322a), a main body (1322b) and a power connection portion (1322c).

12. An electric pump (100), characterized in that: The electric pump (100) comprises a motor assembly (13), wherein the motor assembly (13) comprises a connecting plate assembly (132), a stator winding (131), a shaft (133) and a motor housing (134); the connecting plate assembly (132) is electrically connected to the stator winding (131), and a component formed by combining the connecting plate assembly (132) and the stator winding (131) is defined as a first component (22); and the motor housing (134) is formed by injection molding using at least the first component (22) and the shaft (133) as inserts.

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