Control device and manufacturing method

Abstract

The control device further comprises a shell, a stator assembly and a rotor assembly which are located in the shell, the control device further comprises a first shaft, the first shaft is fixedly connected with the shell, the rotor assembly is arranged on the first shaft in a sleeving mode and can rotate around the first shaft, the shell is provided with a first limiting column, the first limiting column is provided with a first limiting hole, and the first limiting hole is provided with a second limiting hole. One end of the heated first shaft is inserted into the first limiting hole; through the arrangement, deflection of the motor shaft is prevented, and the precision of the control device is improved. Meanwhile, the invention further provides a manufacturing method which is beneficial to preventing the motor shaft from deflecting and improving the precision of the control device.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and in particular to a control device and a manufacturing method thereof. Background Art

[0002] The control device can be applied to an electric valve, and the control device includes a stator assembly, a rotor assembly, and a gear, and the output end of the rotor assembly is meshed with the gear. The control device also includes a motor shaft, and the rotor assembly is sleeved on the motor shaft and can rotate around the motor shaft. In the related art, the motor shaft and the outer shell of the control device are fixed by injection molding, and the outer shell of the control device is formed by injection molding with the motor shaft as an insert. However, in this arrangement, during the cooling process of the injection molding material, the injection molding material may deform, causing the motor shaft to be deflected, thereby affecting the accuracy of the control device. Summary of the invention

[0003] The purpose of the present application is to provide a control device and a manufacturing method, which are helpful to prevent the motor shaft from being deflected and improve the accuracy of the control device.

[0004] To achieve the above purpose, an embodiment of the present application adopts the following technical solution:

[0005] A control device comprises a stator assembly, a rotor assembly and a transmission mechanism, wherein the stator assembly is located at a portion of the outer periphery of the rotor assembly, the rotor assembly comprises a magnetic rotor and a support portion, the magnetic rotor is fixedly connected to the support portion, the support portion comprises a gear portion, the transmission mechanism comprises a first gear, and the rotor assembly is transmission-connected to the first gear via the gear portion;

[0006] The control device also includes a shell, and the stator assembly and the rotor assembly are located in the shell. The control device also includes a first shaft, which is fixedly connected to the shell, and the rotor assembly is sleeved on the first shaft and can rotate around the first shaft. The shell has a first limiting column, and the first limiting column has a first limiting hole. One end of the heated first shaft is inserted into the first limiting hole.

[0007] A manufacturing method for manufacturing a control device, the control method comprising:

[0008] Providing a housing, wherein the housing has a first limiting column, and the first limiting column has a first limiting hole;

[0009] providing a first shaft, and heating the first shaft;

[0010] Insert one end of the heated first shaft into the first limiting hole.

[0011] An embodiment of the present application provides a control device, the control device also includes a housing, a stator assembly and a rotor assembly are located in the housing, the control device also includes a first shaft, the first shaft is fixedly connected to the housing, the rotor assembly is sleeved on the first shaft and can rotate around the first shaft, the housing has a first limit column, the first limit column has a first limit hole, and one end of the heated first shaft is inserted into the first limit hole; such a configuration is conducive to preventing the motor shaft from being deflected and improving the accuracy of the control device. A manufacturing method is also provided, and the application of the manufacturing method is conducive to preventing the motor shaft from being deflected and improving the accuracy of the control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the control device provided by the present application;

[0013] Figure 2 yes Figure 1 A schematic diagram of a top view of the structure of the control device;

[0014] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of the central control device along the AA plane;

[0015] Figure 4 yes Figure 2 A schematic diagram of the cross-sectional structure of the middle control device along plane BB;

[0016] Figure 5 yes Figure 2 A schematic diagram of the cross-sectional structure of the central control device along the CC plane;

[0017] Figure 6 Figure 2 A schematic diagram of the three-dimensional structure of the central control device without the cover plate from one viewing angle;

[0018] Figure 7 It is an exploded structural diagram of a part of the structure of the control device;

[0019] Figure 8 A schematic cross-sectional view of the combined structure of the housing and the first shaft from one viewing angle;

[0020] Fig. 9 It is a schematic diagram of the cross-sectional structure of the shell from one perspective;

[0021] Fig.10 It is a structural schematic diagram of a stator assembly from one perspective;

[0022] Fig.11 yes Fig.10 A structural schematic diagram of the stator assembly from another perspective;

[0023] Fig.12 yes Fig.10A structural diagram of the stator core from one perspective;

[0024] Fig.13 It is a structural schematic diagram of the rotor assembly from one perspective;

[0025] Fig.14 It is a structural schematic diagram of the rotor assembly from another perspective;

[0026] Fig.15 yes Fig.14 Schematic diagram of the cross-sectional structure of the middle rotor assembly from one perspective along the DD plane. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. In order to fully understand the present invention, many specific details are mentioned in the following detailed description. However, it should be understood by those skilled in the art that the specific components, devices and features illustrated in the accompanying drawings and described herein are merely exemplary and should not be regarded as limiting.

[0028] Combination Figure 1-Figure 7 The control device 100 provided in the embodiment of the present application can be applied to fluid control, such as a water valve for controlling water, a refrigerant ball valve for controlling refrigerant, etc.

[0029] Combination Figure 1-Figure 7 In this embodiment, the control device 100 includes a rotor assembly 1, a stator assembly 2 and a transmission mechanism 3. The stator assembly 2 is located at the outer periphery of a portion of the rotor assembly 1. The rotor assembly 1 includes a support portion 11 and a magnetic rotor 12, and the magnetic rotor 12 is fixedly connected to the support portion 11. The support portion 11 includes a gear portion 111, and the transmission mechanism 3 includes a first gear 31. The rotor assembly 1 is transmission-connected to the first gear 31 through the gear portion 111. The transmission mechanism 3 also includes an output gear 33, and the output gear 33 has an output shaft 331. The output shaft 331 can drive a valve core (not shown in the figure) to move and control the flow of fluid. The valve core can be, for example, a ball valve core.

[0030] Combination Figure 3-Figure 9The control device 100 further includes a housing 4, and the stator assembly 2 and the rotor assembly 1 are located in a cavity formed by the housing 4. The control device 100 further includes a first shaft 51, which is fixedly connected to the housing 4, and the rotor assembly 1 is sleeved on the first shaft 51 and can rotate around the first shaft 51. The housing 4 has a first limiting column 41, and the first limiting column 41 has a first limiting hole 411, and one end of the heated first shaft 51 is inserted into the first limiting hole 411. The housing 4 is made of plastic, and the first shaft 51 is made of metal. One end of the first shaft 51 is heated to at least a degree that softens the surface of the first limiting column 41 in contact with it, thereby eliminating the stress of the assembly of the housing 4 and the first shaft 51, avoiding the first shaft 51 from being deflected relative to the first limiting column 41, and improving the accuracy of the control device 100. In this embodiment, the first shaft 51 is heated to a degree that melts the surface of the first limiting column 41 in contact with it, which can achieve a better effect. During the process of inserting the first shaft 51 into the first limiting hole 411 , the first shaft 51 and the first limiting column 41 are kept coaxial by a fixture.

[0031] Combination Figure 3-Figure 9 In this embodiment, the housing 4 includes a bottom wall portion 4a and a peripheral wall portion 4b, and a first limiting column 41 is protruded from the bottom wall portion 4a. The first limiting column 41 has a guide section 412, which is close to the opening side of the first limiting hole 411. The guide section 412 forms part of the first limiting hole 411. The guide section 412 is a conical surface, and the inner diameter of the conical surface is larger at the top and smaller at the bottom. The guide section 412 can provide guidance for the first shaft 51 to be inserted into the first limiting hole 411, so as to facilitate installation.

[0032] Combination Figure 3-Figure 9 In this embodiment, the first shaft 51 includes a first section 511 and a second section 512, and at least a portion of the first section 511 is located in the first limiting hole 411. The first shaft 51 has a chip storage groove 513, which is located at the outer periphery of the first section 511. The chip storage groove 513 is generally annular, and the provision of the chip storage groove 513 is conducive to storing impurities generated during the installation of the first shaft 51, so as to prevent the impurities from causing the first shaft 51 to deflect. Of course, the chip storage groove 513 can also be other shapes, such as a semi-annular groove.

[0033] Combination Figure 3-Figure 9 , Figure 13-Figure 15In this embodiment, the control device 100 further includes a cover plate 6, the cover plate 6 has a second limiting column 61, and the second limiting column 61 has a second limiting hole 611. The first limiting hole 411 and the second limiting hole 611 are coaxially arranged, and at least part of the second section 512 of the first shaft 51 is located in the second limiting hole 611. The support portion 11 includes a support shaft 112 and a rotor bearing portion 113, and the rotor bearing portion 113 and the magnetic rotor 12 are fixed by injection molding. The support shaft 112 has a center hole 1121. The first shaft 51 passes through the center hole 1121, and the support shaft 112 is limited between the first limiting column 41 and the second limiting column 61, so that the rotor assembly 1 can rotate around the first shaft 51 at the first limiting column 41 and the second limiting column 61.

[0034] Combination Figure 3-Figure 9 In this embodiment, the control device 100 also includes a second shaft 52, which is fixedly connected to the housing 4, and the first gear 31 is sleeved on the second shaft 52 and can rotate around the second shaft 52. The housing 4 has a third limiting column 42, which is protruding from the bottom wall portion 4a. The third limiting column 42 has a third limiting hole 421, and one end of the heated second shaft 52 is inserted into the third limiting hole 421. In this embodiment, the second shaft 52 is heated to a degree that the surface of the third limiting column 42 in contact with it can be melted. During the process of the second shaft 52 being inserted into the third limiting hole 421, the second shaft 52 and the third limiting column 42 are kept coaxial by a fixture. The second shaft 52 can also be provided with a chip storage groove. This arrangement can eliminate the stress of the assembly of the housing 4 and the second shaft 52, avoid the second shaft 52 from being deflected relative to the third limiting column 42, and improve the accuracy of the control device 100.

[0035] Combination Figure 3-Figure 9 In this embodiment, further, the control device 100 also includes a third shaft 53, and the third shaft 53 is fixedly connected to the housing 4. The transmission mechanism 3 includes a second gear 32, and the second gear 32 is transmission-connected to the first gear 31. The second gear 32 is sleeved on the third shaft 53 and can rotate around the third shaft 53. The housing 4 has a fourth limiting column 43, and the fourth limiting column 43 is protruded from the bottom wall portion 4a. The fourth limiting column 43 has a fourth limiting hole 431, and one end of the heated third shaft 53 is inserted into the fourth limiting hole 431. Such a configuration can also eliminate the stress of the assembly of the housing 4 and the third shaft 53, avoid the deflection of the third shaft 53 relative to the fourth limiting column 43, and improve the accuracy of the control device 100. Similarly, other shafts for cooperating with gears can also be configured in the same way.

[0036] Combination Figure 3-Figure 7 , Figure 10-12In this embodiment, the stator assembly 2 includes an outer peripheral portion 21. Along the radial direction of the stator assembly 2, the stator assembly 2 has a first groove 211 recessed in the outer peripheral portion 21, and a portion of the first shaft 51 is located in the first groove 211. In this configuration, since a portion of the second shaft 52 is located in the first groove 211, the distance between the second shaft 52 and the central axis of the rotor assembly 1 is smaller, thereby reducing the radius of the first gear 31, reducing the space occupied by the first gear 31, and further reducing the size of the control device 100.

[0037] Combination Figure 3-Figure 7 , Figure 10-12 In this embodiment, the stator assembly 2 includes a coil assembly 22, a stator core 23, an injection molding body 24 and a pin 25. The injection molding body 24 covers a portion of the stator core 23, the pin 25 and the injection molding body 24 are fixed by injection molding, and the coil assembly 22 is wound around the stator core 23. The pin 25 includes a first pin 251, a second pin 252 and a third pin 253. In this embodiment, the coil assembly 22 adopts a triangle connection method, the head and the tail of the three-phase winding are connected respectively, and the first pin 251, the second pin 252 and the third pin 253 are respectively led out as each connected point. The pin 25 includes a first terminal 254, the first terminal 254, the first terminal 254 has a winding groove 2541, the enameled wire of the coil assembly 22 is wound around the first terminal 254, and the enameled wire is welded and electrically connected to the first terminal 254 by tinning. The control device 100 further includes an electric control board 7 , and the plug pin 25 includes a second terminal 255 . The second terminal 255 of the plug pin 25 is electrically connected to the electric control board 7 .

[0038] Combination Figure 3-Figure 7 , Figure 10-12 In this embodiment, the stator assembly 2 further includes a grounding terminal 26, and the stator assembly 2 has a mounting hole 27. In the mounting hole 27, the outer peripheral wall of the stator core 23 is exposed. Part of the grounding terminal 26 is located in the mounting hole 27, one end of the grounding terminal 26 abuts against the stator core 23, and the other end of the grounding terminal 26 is connected to the grounding end of the electric control board 7, thereby achieving grounding of the stator core 23 and improving the EMC performance of the control device. In this embodiment, the mounting hole 27 is formed on the stator core 23, which can facilitate the assembly of the grounding terminal 26 and improve the reliability of the grounding connection.

[0039] In this embodiment, the first plug pin 251, the second plug pin 252, the third plug pin 253 and the ground terminal 26 are all connected to the electric control board 7 by means of fisheye pin press-fit. Of course, in other embodiments, they can also be directly welded.

[0040] refer to Figure 1-Figure 15 This embodiment further provides a manufacturing method for manufacturing the control device 100, the control method comprising:

[0041] A housing 4 is provided, wherein the housing 4 has a first limiting column 41, and the first limiting column 41 has a first limiting hole 411;

[0042] providing a first shaft 51 and heating the first shaft 51;

[0043] One end of the heated first shaft 51 is inserted into the first limiting hole 411 .

[0044] In this embodiment, the housing 4 is made of plastic material, the housing 4 is pre-injection molded, and the first shaft 51 is made of metal material. One end of the first shaft 51 is heated to at least the extent that the surface of the first limiting column 41 in contact with it is softened, thereby eliminating the stress of the assembly of the housing 4 and the first shaft 51, avoiding the first shaft 51 from being deflected relative to the first limiting column 41, and improving the accuracy of the control device 100. In this embodiment, the first shaft 51 is heated to the extent that the surface of the first limiting column 41 in contact with it is melted, which can achieve a better effect. During the process of inserting the first shaft 51 into the first limiting hole 411, the first shaft 51 and the first limiting column 41 are kept coaxial by a fixture.

[0045] The manufacturing method provided in this embodiment can be applied to the manufacture of the above-mentioned control device 100.

[0046] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A control device, characterized in that: It comprises a stator assembly, a rotor assembly and a transmission mechanism, wherein the stator assembly is located at a portion of the outer periphery of the rotor assembly, the rotor assembly comprises a magnetic rotor and a support portion, the magnetic rotor is fixedly connected to the support portion, the support portion comprises a gear portion, the transmission mechanism comprises a first gear, and the rotor assembly is transmission-connected to the first gear through the gear portion; The control device also includes a shell, and the stator assembly and the rotor assembly are located in the shell. The control device also includes a first shaft, which is fixedly connected to the shell, and the rotor assembly is sleeved on the first shaft and can rotate around the first shaft. The shell has a first limiting column, and the first limiting column has a first limiting hole. One end of the heated first shaft is inserted into the first limiting hole.

2. The control device according to claim 1, characterized in that: The first shaft includes a first section and a second section. At least a portion of the first section is located in the first limiting hole. The first shaft has a chip storage groove. The chip storage groove is located at the outer periphery of the first section and is substantially annular.

3. The control device according to claim 1 or 2, characterized in that: The shell includes a peripheral wall portion and a bottom wall portion, the first limiting column is protruded from the bottom wall portion, the first limiting column has a guide section, the guide section is close to the opening side of the first limiting hole, the guide section forms part of the first limiting hole, and the guide section is a conical surface.

4. The control device according to claim 3, characterized in that: The control device also includes a cover plate, the cover plate has a second limiting column, the second limiting column has a second limiting hole, the first limiting hole and the second limiting hole are coaxially arranged, and at least a portion of the second section of the first shaft is located in the second limiting hole.

5. The control device according to claim 4, characterized in that: The support portion includes a rotor bearing portion and a support shaft, the rotor bearing portion and the magnetic rotor are fixed by injection molding, the support shaft has a center hole, the first shaft passes through the center hole, and the support shaft is limited between the first limiting column and the second limiting column.

6. The control device according to any one of claims 1 to 5, characterized in that: The control device also includes a second shaft, which is fixedly connected to the shell. The first gear is sleeved on the second shaft and can rotate around the second shaft. The shell has a third limiting column, and the third limiting column has a third limiting hole. One end of the heated second shaft is inserted into the third limiting hole.

7. The control device according to claim 6, characterized in that: The control device also includes a third shaft, which is fixedly connected to the shell. The transmission structure includes a second gear, which is transmission-connected to the first gear. The second gear is sleeved on the third shaft and can rotate around the third shaft. The shell has a fourth limiting column, and the fourth limiting column has a fourth limiting hole. One end of the heated third shaft is inserted into the fourth limiting hole.

8. The control device according to any one of claims 1 to 7, characterized in that: The stator assembly includes an outer peripheral portion. Along a radial direction of the stator assembly, the stator assembly has a first groove recessed in the outer peripheral portion. A portion of the first shaft portion is located in the first groove.

9. The control device according to any one of claims 1 to 8, characterized in that: The stator assembly includes a coil assembly, a stator core, an injection molded body and a pin, the injection molded body covers a portion of the stator core, the pin and the injection molded body are fixed by injection molding, the coil assembly is wound around the stator core, the pin includes a first pin, a second pin and a third pin, the pin includes a first terminal, the first terminal has a winding groove, the enameled wire of the coil assembly is wound around the first terminal, and is welded and electrically connected by tinning; the control device also includes an electric control board, the pin includes a second terminal, and the second terminal of the pin is electrically connected to the electric control board.

10. The control device according to claim 9, characterized in that: The stator assembly also includes a grounding terminal. The stator assembly has a mounting hole, in which the outer peripheral wall of the stator core is exposed, a portion of the grounding terminal is located in the mounting hole, one end of the abutting terminal abuts against the outer peripheral wall of the stator core, and the other end of the grounding terminal is connected to the grounding terminal of the electric control board.

11. A manufacturing method, characterized in that: For manufacturing a control device, the control method comprises: Providing a housing, wherein the housing has a first limiting column, and the first limiting column has a first limiting hole; providing a first shaft, and heating the first shaft; Insert one end of the heated first shaft into the first limiting hole.

12. The manufacturing method according to claim 11, characterized in that: The shell is made of plastic, and the first shaft is made of metal. One end of the first shaft is heated to a degree that at least softens the surface of the first limit column in contact with it. During the process of inserting the first shaft into the first limit hole, the first shaft and the first limit column are kept coaxial by a tooling fixture.

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