Motor shell assembly, machining die and fluid driving device

Abstract

The motor shell assembly comprises a stator winding and an injection molding part, the injection molding part is formed by injection molding at least with the stator winding as an insert, the stator winding comprises a stator iron core and an insulation part, the insulation part at least wraps part of the stator iron core, the stator iron core comprises a plurality of sub iron cores, the insulation part comprises a first end part and a second end part, and the first end part is connected with the second end part. The injection molding part comprises a first injection molding body, the second end part comprises a first section part and a second section part, the first end part and the first section part are located outside the first injection molding body, the second section part is located in the first injection molding body, the motor shell assembly comprises a supporting part, part of the supporting part is located outside the first injection molding body, and the supporting part and the second section part are positively projected to a first datum plane; the projection of at least part of the supporting part is located in the projection of the second section part. In this way, the yield of the motor shell assembly can be improved. The invention further discloses a machining die and a fluid driving device.

Description

Technical Field

[0001] This application relates to the field of fluid control, and in particular to a motor housing assembly, a processing mold, and a fluid driving device.

Background Art

[0002] The motor housing assembly includes a stator winding and an injection molding part. The stator winding includes a stator core, and the stator core includes a plurality of sub-cores. The injection molding part is formed by injection molding at least with the stator winding as an insert. During the injection molding process, under the action of the injection pressure, the plurality of sub-cores are prone to displacement, and the yield of the motor housing assembly decreases.

Summary of the Invention

[0003] The purpose of the present invention is to provide a motor housing assembly, a processing mold, and a fluid driving device, which are beneficial to improving the yield of the motor housing assembly.

[0004] To achieve the above purpose, a technical solution provided by an embodiment of the present application is as follows: A motor housing assembly, the motor housing assembly includes a stator winding and an injection molding part. The injection molding part is formed by injection molding at least with the stator winding as an insert. The stator winding includes a stator core and an insulating part. The insulating part at least covers part of the stator core. The stator core includes a plurality of sub-cores. The insulating part includes a first end and a second end. Along the axial direction of the motor housing assembly, the first end is located on one side of the plurality of sub-cores, and the second end is located on the other side of the plurality of sub-cores. The injection molding part includes a first injection body. The second end includes a first section and a second section. The first end and the first section are located outside the first injection body, and the second section is located inside the first injection body. The motor housing assembly includes a support part, and part of the support part is located outside the first injection body. Define the plane where the upper surface of the sub-core is located as the first reference plane. Project the support part and the second section onto the first reference plane in the positive direction. At least part of the projection of the support part is located within the projection of the second section.

[0005] In the technical solution of an embodiment of the present application, the insulating part includes a first end and a second end. The first end and part of the second end are located outside the first injection body. The motor housing assembly includes a support part, and part of the support part is located outside the first injection body. Define the plane where the upper surface of the sub-core is located as the first reference plane. Project the support part and the second section onto the first reference plane in the positive direction. At least part of the projection of the support part is located within the projection of the second section. Thus, the first end, the second end, and the support part can be used as the limiting reference along the axial direction of the motor housing assembly during injection molding. Thus, it is beneficial to reduce the displacement of the sub-core in the axial direction, and further beneficial to improve the yield of the motor housing assembly.

[0006] One implementation provided by this application adopts the following technical solution: A processing mold includes an upper mold and a lower mold. The upper mold has an upper mold cavity, and the wall corresponding to the upper mold cavity includes an upper mold bottom. The upper mold further includes a positioning portion, which protrudes from the upper mold bottom in a direction away from the upper mold bottom. The lower mold has a lower mold cavity, and the wall corresponding to the lower mold cavity includes a lower mold bottom. The lower mold further includes a limiting portion, which protrudes from the lower mold bottom in a direction away from the lower mold bottom. Define a first surface, which is the plane where the upper mold bottom is located. Project the positioning portion and the limiting portion onto a plane parallel to the plane where the first surface is located, and at least part of the projection of the limiting portion is located within the projection of the positioning portion. In this way, it is beneficial to improve the yield rate of the product to be injection-molded.

[0007] One implementation provided by this application adopts the following technical solution: A fluid driving device includes the above-mentioned motor housing assembly. The motor housing assembly has a rotor cavity. The fluid driving device includes a rotating assembly, and the rotating assembly includes a rotor assembly, and at least part of the rotor assembly is located in the rotor cavity. In this way, it is beneficial to improve the yield rate of the fluid driving device.

Description of the Drawings

[0008] Figure 1 is a three-dimensional structural schematic diagram of the first implementation of the fluid driving device of this application;

[0009] Figure 2 is a three-dimensional structural schematic diagram of the second implementation of the fluid driving device of this application;

[0010] Figure 3 is Figure 2 the structural schematic diagram of the fluid driving device in the first implementation along the X-X section in;

[0011] Figure 4 is Figure 3 the view in the A direction of the fluid driving device in;

[0012] Figure 5 is Figure 3 the view in the B direction of the fluid driving device in;

[0013] Figure 6 is Figure 2 the structural schematic diagram of the fluid driving device in the second implementation along the X-X section in;

[0014] Figure 7 is Figure 6 the exploded structural schematic diagram of the motor housing assembly in the fluid driving device;

[0015] Figure 8 is Figure 7 the three-dimensional structural schematic diagram of the first component in one direction in;

[0016] Figure 9 isFigure 7 Schematic diagram of the three-dimensional structure of the first component in another direction;

[0017] Figure 10 Is Figure 9 Schematic diagram of the sectional structure along the Y-Y section in;

[0018] Figure 11 Is Figure 1 、 Figure 2 Schematic diagram of the structure of the first assembly in the fluid driving device in;

[0019] Figure 12 Is Figure 11 Schematic diagram of the explosion structure in;

[0020] Figure 13 Is Figure 12 Schematic diagram of the three-dimensional structure of an implementation manner of the stator winding in;

[0021] Figure 14 Is Figure 13 Schematic diagram of the three-dimensional structure of an implementation manner of the combination of the stator core and the insulating part in;

[0022] Figure 15 Is Figure 14 Schematic diagram of the three-dimensional structure of a sub-core of the stator core in;

[0023] Figure 16 Is Figure 1 、 Figure 2 Schematic diagram of the three-dimensional structure of a connecting plate assembly in the fluid driving device in;

[0024] Figure 17 Is Figure 16 Schematic diagram of the sectional structure of the connecting plate assembly in one direction in;

[0025] Figure 18 Schematic diagram of the structure of the support part and the second section projected positively onto the first reference plane;

[0026] Figure 19 Schematic diagram of the sectional structure of a processing die;

[0027] Figure 20 Is Figure 19 Schematic diagram of the three-dimensional structure of an implementation manner of the lower die in;

[0028] Figure 21 Is Figure 20 View along the C direction in;

[0029] Figure 22 Is Figure 19 Schematic diagram of the three-dimensional structure of an implementation manner of the upper die in;

[0030] Figure 23 is Figure 22 the D-direction view in the figure;

[0031] In the attached drawings: 100, fluid drive device;

[0032] 11, pump cover;

[0033] 12, rotating assembly; 121, impeller assembly; 122, rotor assembly;

[0034] 13, motor housing assembly; 131, stator winding; 1311, stator core; 1311a, sub-core; 1311b, upper surface; 1311c, lower surface; 1311d, sub-yoke; 1311e, sub-boot; 1312, insulation part; 1312a, first end; 1312b, second end;

[0035] 1312c, first section part; 1312d, second section part; 1312d’, projection of the second section part; 1312e, sub-insulation part; 1312f, sub-block part; 1312h, sub-block part one; 1312i, sub-block part two; 1312p, positioning convex part; 1313, winding; 1312q, sub-limiting part; 1312s, sub-limiting part one;

[0036] 132, injection molding part; 1321, first injection molded body; 1322, second injection molded body;

[0037] 133, connecting plate assembly; 1311, conductive part; 1332, limiting part; 1332b, supporting part; 1333, front side; 1334, back side; 1335, positioning groove part; 1336, first contact protrusion; 1337, second contact protrusion;

[0038] 14, shaft;

[0039] 15, pump inner cavity; 151, rotor cavity; 152, impeller cavity; 16, first component; 17, first fitting; 101, first reference surface;

[0040] 102, processing die; 1021, upper die; 1021a, upper die cavity; 1021b, positioning part; 1021c, bottom of the upper die;

[0041] 1022, lower die; 1022a, limiting part; 1022b, bottom of the lower die; 1022c, lower die cavity; 1023, first surface.

Detailed implementation manner

[0042] The present invention will be further described below in conjunction with the attached drawings and specific embodiments:

[0043] The following further details the specific embodiments of the present application in conjunction with the accompanying drawings. First, it should be noted that directional terms such as "up," "down," "left," "right," "front," "rear," "inside," "outside," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the structures shown in the corresponding drawings. These are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0044] The fluid driving device 100 in the following embodiments can provide flow power for the working medium of the automotive thermal management system. The working medium can be water or an aqueous solution, such as an aqueous solution including 50% ethylene glycol. Of course, the working medium can also be other substances.

[0045] See also Figures 1 to 17 As shown, the present application provides a fluid drive device 100 including a pump cover 11, a rotating assembly 12, a motor housing assembly 13 and a shaft 14. The motor housing assembly 13 includes a stator winding 131, a connecting plate assembly 133 and an injection molding portion 132. The fluid drive device 100 has a pump inner cavity 15. The rotating assembly 12 is located in the pump inner cavity 15. The shaft 14 is injection-molded and fixed to the injection molding portion 132. The pump cover 11 is sealed and fixed to the motor housing assembly 13. It should be noted that the sealing and fixing here means that when the fluid drive device 100 is working, the working medium is prevented from leaking to the outside of the fluid drive device 100 through the above-mentioned sealing and fixing structure. The pump inner cavity 15 includes a rotor cavity 151 and an impeller cavity 152, and the rotor cavity 151 and the impeller cavity 152 are connected. The rotating assembly 12 includes a rotor assembly 122 and an impeller assembly 121. The rotor assembly 122 includes a permanent magnet. At least part of the rotor assembly 122 is located in the rotor cavity 151, the impeller assembly 121 is located in the impeller cavity 152, and the working medium can flow through the pump cavity 15. In a specific embodiment, the other end of the shaft 14 is at least partially located in the rotor cavity 151, at least part of the rotating assembly 12 is sleeved on the outer periphery of the shaft 14, and the rotating assembly 12 is connected to the shaft 14 in a transmission manner. Of course, as other implementation methods, the shaft 14 is limitedly matched with the injection molding part 132, the rotating assembly 12 and the shaft 14 are fixedly connected, and the shaft 14 rotates with the rotor assembly 122. In this embodiment, the shaft 14 is fixed to the injection molding part 132 by injection molding. Of course, as other implementation methods, please refer to Figures 3 to 4As shown, the fluid drive device 100 may also not include the pump cover 11, and the pump cover 11 is integrated on an external structure. Such a setting is more conducive to the integrated design of the fluid drive device 100, making the structure of the fluid drive device 100 more compact, and more conducive to the miniaturization and light weight of the structure of the fluid drive device 100. When the fluid drive device 100 operates, the current of the stator winding 1313 is controlled to control the excitation magnetic field generated by the stator winding 1313, and the rotating assembly 12 rotates around the shaft 14 under the action of the excitation magnetic field. It should be noted that the axial direction of the following fluid drive device 100 is the direction in which the shaft 14 extends, and the radial direction of the fluid drive device 100 is perpendicular to the axial direction of the fluid drive device 100. It should be noted that: the axial direction of the fluid drive device is the direction in which the center line of the shaft extends, the radial direction of the fluid drive device is perpendicular to the axial direction of the fluid drive device, the axial direction of the motor housing assembly is the same as the axial direction of the fluid drive device, and the radial direction of the motor housing assembly is the same as the radial direction of the fluid drive device.

[0046] See Figure 13 As shown, the stator winding 131 includes a stator core 1311, an insulating portion 1312, and windings 1313. The number of windings 1313 is at least three. The insulating portion 1312 covers at least part of the surface of the stator core 1311. The insulating portion 1312 is used to isolate the windings 1313 and the stator core 1311, so that the windings 1313 and the stator core 1311a are electrically insulated. The insulating portion 1312 and the stator core 1311 may be an integral structural member. Specifically, as an implementation manner, the insulating portion 1312 is formed by insert molding with the stator core 1311. Of course, as other implementation manners, the insulating portion 1312 and the stator core 1311 are separately arranged. Here, "separately arranged" means that the insulating portion 1312 and the stator core 1311 are respectively processed into two separate parts and then assembled. They are connected in a limited manner or fixedly connected by an assembly method. In this embodiment, the insulating portion 1312 is formed by insert molding with the stator core 1311. It can be understood that the stator core 1311 and the insulating portion 1312 are an integral structure. The windings 1313 are wound around the insulating portion 1312. As a specific embodiment, the number of windings 1313 is nine. Of course, as other implementation manners, the windings 1313 may also include other numbers of windings 1313, such as three or six or twelve or other numbers.

[0047] As described in the background art, the stator core includes a plurality of sub-cores. During the process of forming the injection molding portion, the plurality of sub-cores are prone to displacement, and the yield of the motor housing assembly decreases.

[0048] To improve the yield of the motor housing assembly 13, as an implementation manner, please refer to Figures 1 to 17As shown, the motor housing assembly 13 includes a stator winding 131 and an injection molding part 132. The injection molding part 132 is formed by injection molding with at least the stator winding 131 as an insert. The stator winding 131 includes a stator core 1311 and an insulating part 1312. The insulating part 1312 covers at least part of the stator core 1311. The stator core 1311 includes a plurality of sub-cores 1311a. The insulating part 1312 includes a first end part 1312a and a second end part 1312b. Along the axial direction of the motor housing assembly 13, the first end part 1312a is on one side of the plurality of sub-cores 1311a, and the second end part 1312b is on the other side of the plurality of sub-cores 1311a. The injection molding part 132 includes a first injection molded body 1321 / 1321'. The second end part 1312b includes a first section part 1312c and a second section part 1312d. The first end part 1312a and the first section part 1312c are located outside the first injection molded body 1321 / 1321', and the second section part 1312d is located inside the first injection molded body 1321 / 1321'. The motor housing assembly 13 includes a support part 1332b. Part of the support part 1332b is located outside the first injection molded body 1321 / 1321'. Define the plane where the upper surface 1311b of the sub-core 1311a is located as the first reference plane 101. Project the support part 1332b and the second section part 1312d onto the positive direction of the first reference plane 101. At least part of the projection 1332b' of the support part 1332b is located inside the projection 1312d' of the second section part 1312d. In this way, the first end part 1312a, the second end part 1312b, and the support part 1332b can be used as the limit reference along the axial direction of the motor housing assembly 13 during injection molding. In this way, it is beneficial to reduce the axial displacement of the sub-core, and thus beneficial to improve the yield rate of the motor housing assembly 13. It should be noted that: The first end part 1312a is the end surface on one side of the insulating part 1312, and the second end part 1312b is the end surface on the other side of the insulating part 1312. "The second end part 1312b includes a first section part 1312c and a second section part 1312d. The first end part 1312a and the first section part 1312c are located outside the first injection molded body 1321 / 1321'" means that the first end part 1312a and the first section part 1312c are not covered by the first injection molded body 1321 / 1321'. "The second section part 1312d is located inside the first injection molded body 1321 / 1321'" means that the second section part 1312d is covered by the first injection molded body 1321 / 1321'. "Part of the support part 1332b is located outside the first injection molded body 1321 / 1321'" means that part of the support part 1332b is not covered by the first injection molded body 1321 / 1321'.

[0049] The insulating part can be an integral structure. It can be understood that the integral insulating part can be an integral structural member, or it can be an integral structure formed by fixing and connecting multiple sub-insulating parts to each other. Of course, the insulating part can also be a split structure, and multiple sub-insulating parts are not connected to each other. Specifically, please refer to Figures 1 to 14 As shown, in this embodiment, the insulating part 1312 is a split structural member. As a realization method, the insulating part 1312 includes multiple sub-insulating parts 1312e. The sub-insulating part 1312e is fixedly connected or limitedly connected to the sub-core 1311a. Specifically, the sub-insulating part 1312e is injection-molded with the sub-core 1311a as an insert. The sub-insulating part 1312e includes a sub-block part 1312f. The sub-core 1311a part includes a sub-yoke part 1311d and a sub-boot part 1311e. Along the radial direction of the motor housing assembly 13, the sub-block part 1312f is arranged closer to the sub-yoke part 1311d relative to the sub-boot part 1311e. The sub-core 1311a part includes an upper surface 1311b and a lower surface 1311c. The sub-block part 1312f includes a first sub-block part 1312h and a second sub-block part 1312i. Along the axial direction of the motor housing assembly 13, the first sub-block part 1312h extends from the upper surface 1311b in a direction away from the upper surface 1311b, and the second sub-block part 1312i extends from the lower surface 1311c in a direction away from the lower surface 1311c. For the first sub-block part 1312h, the end surface of the first sub-block part 1312h forms a first end 1312a, and the end surface of the second sub-block part 1312i forms a second end 1312b. In this way, taking the insulating part as the limiting reference when forming the injection part is beneficial to reducing the situation of the end leakage of the stator core 1311, and further beneficial to reducing the risk of corrosion of the stator core 1311. In this embodiment, the reference plane formed by the first end 1312a will limit three degrees of freedom of the stator winding. In this way, while reducing the risk of corrosion of the stator core 1311, it is beneficial to increase the distance dimension between each base point along the radial direction of the motor housing assembly 13, and further beneficial to reducing the situation that the stator winding 131 shakes due to the injection pressure during injection molding. It should be noted that the "distance dimension between each base point along the radial direction of the motor housing assembly" here is along the radial direction of the motor housing assembly, and is the distance dimension between each reference point and the axis of the fluid driving device.

[0050] To simplify the manufacturing steps of the motor housing assembly 13, as a realization method, please refer to Figures 1 to 17As shown, the motor housing assembly 13 includes a connecting plate assembly 133. The connecting plate assembly 133 is fixedly connected or limit-connected to the stator winding 131. Along the axial direction of the motor housing assembly 13, the connecting plate assembly 133 is arranged closer to the second end 1312b relative to the first end 1312a. The connecting plate assembly 133 includes a front surface 1333 and a back surface 1334. Along the axial direction of the motor housing assembly 13, the front surface 1333 is farther from the stator winding 131 relative to the back surface 1334. The connecting plate assembly 133 includes a supporting portion 1332b. The supporting portion 1332b protrudes away from the front surface 1333 along the front surface 1333. The second end 1312b is in contact with the back surface 1333. The first injection molded body 1321 is injection molded with at least the connecting plate assembly 133 and the stator winding 131 as inserts.

[0051] Further, please refer to Figures 12 to 18 As shown, as an implementation manner, the supporting portion 1332b and the first sub-block portion 1312g are orthogonally projected onto the first reference plane 101. The projection 1332b' of the supporting portion 1332b is at least partially located within the projection 1312h' of the first sub-block portion 1312h. In this way, for each sub-insulating portion 1312, there is a corresponding position for axial limiting along the fluid driving device 100. During the injection molding process, it is beneficial to reduce the displacement of the sub-core, and thus beneficial to improve the yield rate of the motor housing assembly 13.

[0052] As an implementation manner, please refer to Figures 1 to 18 As shown, the insulating portion 1312 includes a plurality of sub-insulating portions 1312e. The sub-insulating portion 1312e is fixedly connected or limit-connected to the sub-core 1311a. The sub-insulating portion 1312e includes a sub-limiting portion 1312q. Along the radial direction of the motor housing assembly 13, the sub-limiting portion 1312q is closer to the boot portion of the sub-core 1311a relative to the yoke portion of the sub-core 1311a. The sub-limiting portion 1312q includes a first sub-limiting portion 1312s. Along the axial direction of the motor housing assembly 13, the first sub-limiting portion 1312s extends away from the lower surface of the sub-core 1311a from the lower surface of the sub-core 1311a. The connecting plate assembly 133 includes a first contact protrusion 1336. The first contact protrusion 1337 protrudes away from the back surface 1334 along the back surface 1334. The first contact protrusion 1336 is in contact with the first sub-limiting portion 1312s. In this way, the first contact protrusion 1336 can be in contact with the first sub-limiting portion 1312s. During the subsequent injection molding process, the front portion opposite to the first sub-limiting portion 1312s can be used as an injection molding support portion. Thus, it is beneficial to increase the support points when the stator winding is injection molded as an insert, and beneficial to reduce the deformation of the portion of the sub-core close to the axis along the radial direction of the motor housing assembly under the action of the injection molding pressure.

[0053] As another implementation manner, please refer toFigures 1 to 18 As shown, the connecting plate assembly 133 includes a second contact protrusion 1337 that protrudes from the reverse side 1334 in a direction away from the reverse side 1334. The second contact protrusion 1337 is in contact with one of the second segment portions 1312d. In this way, the sub-block portion of the insulating portion can meet different design requirements, and thus can match different customer needs.

[0054] Further, as an implementation manner, please refer to Figures 10 to 17 As shown, when the connecting plate assembly 133 is orthogonally projected in the direction of the first reference plane 101, the projection of the connecting plate assembly 133 covers a part of the projection of the stator winding 131. This is beneficial for realizing the miniaturized design of the fluid driving device 100.

[0055] As an implementation manner, please refer to Figures 7 to 18 As shown, the connecting plate assembly 133 includes a limiting member 1332 and a conductive member 1331. The limiting member 1332 is at least injection-molded with the conductive member 1331 as an insert. The limiting member 1332 includes a front side 1333 and a reverse side 1334. Along the axial direction of the motor housing assembly 13, the supporting portion 1332b protrudes from the front side 1333 in a direction away from the front side 1333. In this way, during injection molding, when axially limiting the stator winding 131, the connecting plate assembly 133 can also be axially limited, which is beneficial for simplifying the mold required during injection molding.

[0056] Further, as an implementation manner, please refer to Figures 8 to 17 As shown, the insulating portion 1312 includes a positioning convex portion 1312p. Along the axial direction of the motor housing assembly 13, the positioning convex portion 1312p protrudes from the second segment portion 1312d in a direction away from the second segment portion 1312d. The connecting plate assembly 133 includes a positioning groove portion 1335. Along the axial direction of the motor housing assembly 13, the positioning groove portion 1335 is recessed from the reverse side 1334 in a direction away from the reverse side 1334. At least a part of the positioning convex portion 1312p is located in the positioning groove. In this way, while limiting the connecting plate assembly 133, it is beneficial to reduce the axial displacement of the stator winding 131, and thus beneficial to improve the yield rate of the motor housing assembly 13.

[0057] Furthermore, please refer to Figures 8 to 17 As shown, along the axial direction of the motor housing, a part of the stator groove portion 1335 extends within the supporting portion 1332b, and a part of the supporting portion 1332b is located in the positioning groove portion 1335. In this way, it is beneficial to reduce the entry of external moisture or air into the interior of the fluid driving device 100 and contact the stator winding 1313, and thus beneficial to improve the service life of the fluid driving device 100.

[0058] As an implementation, please refer to Figures 1 to 3 As shown, the injection molding part 132 can be formed by one-time injection molding. Specifically, the injection molding part 132 can only have the first injection molded body 1321. The inserts for forming the first injection molded body 1321 at least include the stator winding 131 and the connecting plate assembly 133. The assembly of the connecting plate assembly 133 and the stator winding 131 together is the first assembly 17.

[0059] The first injection molded body 1321 is at least injection molded with the stator winding 131 and the connecting plate assembly 133 as inserts. The fluid driving device 100 includes a rotor cavity 151. The wall portion forming the rotor cavity 151 includes the first injection molded body 1321. The rotor cavity 151 can be formed by injection molding, and of course, it can also be formed by other methods. For example, the rotor cavity 151 is formed by machining the first injection molded body 1321. In this embodiment, the rotor cavity 151 is formed by injection molding. In this way, it is beneficial to simplify the process manufacturing steps of the fluid driving device 100.

[0060] As another implementation, please refer to Figures 1 to 2 and Figures 4 to 18As shown, the injection molding part 132 can be formed by two injection moldings. The injection molding part 132 includes a second injection molding body 1322. Define the first component 16. The first component 16 at least includes a stator winding 1313131 and a first injection molding body 1321. The second injection molding body 1322 is at least formed by insert injection molding with the first component 16. The second injection molding body 1322 covers the first end portion 1312a and the first section portion 1312c. Specifically, define the first component 16. The first component 16 includes a first injection molding body 1321, a stator winding 1313, and a connecting plate assembly 133. The second injection molding body 1322 is at least formed by insert injection molding with the first component 16 as an insert. The fluid driving device 100 includes a rotor cavity 151. The wall portion forming the rotor cavity 151 is located in the second injection molding body 1322. In this way, the wall portion forming the rotor cavity 151 is located in the second injection molding body 1322. The rotor cavity 151 can be formed by injection molding, and of course, it can also be formed by other methods. For example, the rotor cavity 151 is formed by machining the second injection molding body 1322. The shaft 14 is injection molded and fixed to the second injection molding body 1322. Part of the stator winding 131 and two parts of the connecting plate assembly 133 are located in the first injection molding body 1321. The second injection molding body 1322 wraps part of the first injection molding body 1321. In this way, first, the wall portion forming the rotor cavity 151 is completely located in the second injection molding body 1322, which is beneficial to reducing the risk of the working medium leaking through the contact surface between the first injection molding body 1321 and the second injection molding body 1322. Second, since two injection moldings are selected, in terms of the material selection of the first injection molding body 1321 and the second injection molding body 1322, different injection molding materials can be selected for the injection molding material of the first injection molding body 1321 and the injection molding material of the second injection molding body 1322. For example, the material of the first injection molding body 1321 can be selected to be relatively cheaper than the material of the second injection molding body 1322. In this way, it is beneficial to reduce the cost of the fluid driving device 100. Of course, to increase the bonding strength between the first injection molding body and the second injection molding body, reduce the situation that external water vapor enters the interior of the motor housing assembly through the joint surface between the first injection molding body and the second injection molding body and contacts the stator winding, and then corrodes the stator core, the same injection molding material can be used for the first injection molding body and the second injection molding body.

[0061] Please refer to Figures 19 to 23As shown in the figure, the present application further includes a processing mold 102. The processing mold 102 includes an upper mold 1021 and a lower mold 1022. The upper mold 1021 has an upper mold cavity 1021a. The wall portion corresponding to the upper mold cavity 1021a includes an upper mold bottom 1021c. The upper mold 1021 further includes a positioning portion 1021b. The positioning portion 1021b is recessed inward from the upper mold bottom 1021c in a direction away from the upper mold bottom 1021c. The lower mold 1022 has a lower mold cavity 1022c. The wall portion corresponding to the lower mold cavity 1022c includes a lower mold bottom 1022b. The lower mold further includes a limiting portion 1022a. The limiting portion 1022a protrudes from the lower mold bottom 1022b in a direction away from the lower mold bottom 1022b. Define a first surface 1023. The first surface 1023 is the plane where the upper mold bottom 1022b is located. Project the positioning portion 1021b and the limiting portion 1022a onto the plane where the first surface 1023 is located. At least a part of the projection of the limiting portion 1022a is located within the projection of the positioning portion 1021b. In this way, it is beneficial to improve the yield of the product to be injection-molded.

[0062] It should be noted that the above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the technical field can still modify the present application or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present application shall be covered by the scope of the claims of the present application.

Claims

1. A motor housing assembly (13), characterized in that: The motor housing assembly (13) includes a stator winding (131) and an injection molding part (132). The injection molding part (132) is formed by injection molding with at least the stator winding (131) as an insert. The stator winding (131) includes a stator core (1311) and an insulating part (1312). The insulating part (1312) covers at least part of the stator core (1311). The stator core (1311) includes a plurality of sub-cores (1311a). The insulating part (1312) includes a first end (1312a) and a second end (1312b). Along the axial direction of the motor housing assembly (13), the first end (1312a) is located on one side of the plurality of sub-cores (1311a), and the second end (1312b) is located on the other side of the plurality of sub-cores (1311a). The injection molding part (132) includes a first injection molding body (1321). The second end (1312b) includes a first section (1312c) and a second section (1312d). The first end (1312a) and the first section (1312c) are located outside the first injection molding body (1321), and the second section (1312d) is located inside the first injection molding body (1321). The motor housing assembly (13) includes a support part (1332b). Part of the support part (1332b) is located outside the first injection molding body (1321). Define the plane where the upper surface (1311b) of the sub-core (1311a) is located as the first reference plane (101). Project the support part (1332b) and the second section (1312d) onto the positive direction of the first reference plane (101). At least part of the projection of the support part (1332b) is located within the projection of the second section (1312d).

2. The motor housing assembly (13) according to claim 1, characterized in that: The insulating portion (1312) includes a plurality of sub-insulating portions (1312e). The sub-insulating portions (1312e) are fixedly connected or limitedly connected to the sub-core (1311a). The sub-insulating portion (1312e) includes a sub-block portion (1312f). The sub-core (1311a) includes a sub-yoke portion (1311d) and a sub-boot portion (1311e). Along the radial direction of the motor housing assembly (13), the sub-block portion (1312f) is disposed closer to the sub-yoke portion (1311d) than the sub-boot portion (1311e). The sub-core (1311a) includes an upper surface (1311b) and a lower surface (1311c). The sub-block portion (1312f) includes a first sub-block portion (1312h) and a second sub-block portion (1312i). Along the axial direction of the motor housing assembly (13), the first sub-block portion (1312h) extends from the upper surface (1311b) in a direction away from the upper surface (1311b), and the second sub-block portion (1312i) extends from the lower surface (1311c) in a direction away from the lower surface (1311c). For the first sub-block portion (1312h), an end surface of the first sub-block portion (1312h) forms the first end portion (1312a), and an end surface of the second sub-block portion (1312i) forms the second end portion (1312b).

3. The motor housing assembly (13) according to claim 1 or 2, characterized in that: The motor housing assembly (13) includes a connecting plate assembly (133). The connecting plate assembly (133) is fixedly connected or limitedly connected to the stator winding (131). Along the axial direction of the motor housing assembly (13), the connecting plate assembly (133) is disposed closer to the second end portion (1312b) than the first end portion (1312a). The connecting plate assembly (133) includes a front surface (1333) and a back surface (1334). Along the axial direction of the motor housing assembly (13), the front surface (1333) is farther from the stator winding (131) than the back surface (1334). The connecting plate assembly (133) includes the supporting portion (1332b). The supporting portion (1332b) protrudes from the front surface (1333) in a direction away from the front surface (1333). The second end portion (1312b) is in contact with the back surface (1333). The first injection molded body (1321) is injection molded at least with the connecting plate assembly (133) and the stator winding (131) as inserts.

4. The motor housing assembly (13) according to claim 3, characterized in that: Project the supporting portion (1332b) and the first sub-block portion (1312h) onto the first reference plane (101). At least a part of the projection of the supporting portion (1332b) is located within the projection of the first sub-block portion (1312h).

5. The motor housing assembly (13) according to claim 3 or 4, characterized in that: The insulating portion (1312) includes a plurality of sub-insulating portions (1312e). The sub-insulating portions (1312e) are fixedly connected or limit-connected to the sub-iron cores (1311a). The sub-insulating portion (1312e) includes a sub-limiting portion (1312q). Along the radial direction of the motor housing assembly (13), the sub-limiting portion (1312q) is closer to the sub-boot portion of the sub-iron core (1311a) than the sub-yoke portion of the sub-iron core (1311a). The sub-limiting portion (1312q) includes a first sub-limiting portion (1312s). Along the axial direction of the motor housing assembly (13), the first sub-limiting portion (1312s) extends from the lower surface of the sub-iron core (1311a) in a direction away from the lower surface of the sub-iron core (1311a). The connecting plate assembly (133) includes a first contact projection (1336), and the first contact projection (1336) is in contact with the first sub-limiting portion (1312s).

6. The motor housing assembly (13) according to any one of claims 3 to 5, characterized in that: The connecting plate assembly (133) includes a limiting member (1332) and a conductive member (1331). The limiting member (1332) is at least formed by insert molding with the conductive member (1331) as an insert. The limiting member (1332) includes the front surface (1333) and the back surface (1334). Along the axial direction of the motor housing assembly (13), the supporting portion (1322b) protrudes from the front surface (1333) in a direction away from the front surface (1333).

7. The motor housing assembly (13) according to claim 6, characterized in that: The insulating portion (1312) includes a positioning convex portion (1312p). Along the axial direction of the motor housing assembly (13), the positioning convex portion (1312p) protrudes from the second section portion (1312d) in a direction away from the second section portion (1312d). The connecting plate assembly (133) includes a positioning groove portion (1335). Along the axial direction of the motor housing assembly (13), the positioning groove portion (1335) is recessed from the back surface (1334) towards the front surface (1333), and at least part of the positioning convex portion (1312p) is located in the positioning groove portion (1335).

8. The motor housing assembly (13) according to any one of claims 1 to 7, characterized in that: The injection molding portion (132) includes a second injection molded body (1322). Define a first assembly (16). The first assembly (16) at least includes the stator winding (131) and the first injection molded body (1321). The second injection molded body (1322) is at least formed by insert molding with the first assembly (16) as an insert, and the second injection molded body (1322) covers the first end portion (1312a).

9. A processing mold (102), characterized in that, The processing die (102) includes an upper die (1021) and a lower die (1022). The upper die (1021) has an upper die cavity (1021a). The wall portion corresponding to the upper die cavity (1021a) includes an upper die bottom (1021c). The upper die (1021) further includes a positioning portion (1021b). The positioning portion (1021b) is recessed from the upper die bottom (1021c) in a direction away from the upper die bottom (1021c). The lower die (1022) has a lower die cavity (1022c). The wall portion corresponding to the lower die cavity (1022c) includes a lower die bottom (1022b). The lower die (1022) further includes a limiting portion (1022a). The limiting portion (1022a) protrudes from the lower die bottom (1022b) in a direction away from the lower die bottom (1022b). Define a first surface (1023). The first surface (1023) is the plane where the upper die bottom (1021c) is located. Project the positioning portion (1021b) and the limiting portion (1022a) onto a plane parallel to the plane where the first surface (1023) is located. At least a part of the projection of the limiting portion (1022a) is located within the projection of the positioning portion (1021b).

10. A fluid driving device (100), characterized in that: Including the motor housing assembly (13) according to any one of claims 1 to 9 above, the motor housing assembly (13) has a rotor cavity (151). The fluid driving device (100) includes a rotating assembly (12). The rotating assembly (12) includes a rotor assembly (122). At least a part of the rotor assembly (122) is located in the rotor cavity (151).

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