Electric valve

Abstract

An electric valve comprises a stator assembly, a valve part, a valve body, a first sealing ring and a sleeve, the first sealing ring is arranged between the stator assembly and the sleeve, and the first sealing ring is limited through a concave part formed in the stator assembly and the sleeve. The moisture in the external environment can be reduced to a certain extent to enter the stator assembly through a gap between the stator assembly and the sleeve, the valve component is in limiting connection with the valve body through the compression nut, the lower end face of the first sealing ring abuts against the supporting pad, the supporting pad is supported by the compression nut, and the supporting pad is located at the upper end of the compression nut. And the limiting structure of the first sealing ring is simplified.

Description

[0001] (This application is a divisional application of the Chinese invention patent application with a filing date of March 16, 2020, application number 202010179491.6, and titled “An Electric Valve and Assembly Method Thereof”) Technical Field

[0002] The invention relates to an electric valve. Background Art

[0003] Electric valves are used in air-conditioning and refrigeration systems. The electric valves include a stator assembly, a rotor assembly and a sleeve. The sleeve is located between the rotor assembly and the stator assembly. How to reduce the external moisture from entering the stator assembly through the gap between the sleeve and the stator assembly is a technical problem. Summary of the Invention

[0004] The present invention provides an electric valve, which is beneficial to reducing external moisture from entering the stator assembly through the gap between the sleeve and the stator assembly, and is also beneficial to simplifying the limiting structure of the first sealing ring.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] 18. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said valve body. said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said valve body.

[0007] The electric valve of the present technical solution sets a first sealing ring between the stator assembly and the sleeve, and limits the first sealing ring by the recess formed in the stator assembly and the sleeve, which is helpful to reduce the moisture in the external environment from entering the stator assembly through the gap between the stator assembly and the sleeve to a certain extent. In addition, the valve component is connected to the valve body by a clamping nut, the lower end face of the first sealing ring abuts against the support pad, and the support pad is supported by the clamping nut. The support pad is located at the upper end of the clamping nut. This arrangement is helpful to simplify the limiting structure of the first sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1It is a cross-sectional structural diagram of an embodiment of an electric valve;

[0009] Figure 2 yes Figure 1 A partially enlarged cross-sectional schematic diagram;

[0010] Figure 3 It is a cross-sectional structural diagram of the stator assembly;

[0011] Figure 4 yes Figure 3 A local enlarged schematic diagram of point I in the middle;

[0012] Figure 5 Schematic diagram of the three-dimensional structure of the support pad;

[0013] Figure 6 It is a schematic diagram of the three-dimensional structure of the compression nut;

[0014] Figure 7 It is a three-dimensional structural schematic diagram of another embodiment of the clamping nut and the support pad. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 This is an embodiment of an electric valve 100. The electric valve 100 can be used in air conditioning systems for flow adjustment and on / off control, and is particularly suitable for automotive air conditioning systems. The electric valve 100 comprises a stator assembly 1, a circuit board 2, a valve component 3, a valve body 4, a rotor assembly 31, and a sleeve 9. The stator assembly 1 is located outside the rotor assembly 31. Together, the stator assembly 1 and the rotor assembly 31 can directly or indirectly drive the movement of the valve component 3. The stator assembly 1 is located outside the sleeve 9, which is located between the stator assembly 1 and the rotor assembly 31. The stator assembly 1 is positionally or fixedly connected to the valve body 4 and electrically / signally connected to the circuit board 2. The stator assembly 1 includes a winding 12, which is located within the stator assembly 1. The valve component 3 includes a valve core 32 and a valve seat 33. The electric valve also has a valve port 331. In this embodiment, the valve port 331 is located on the valve seat 33. Alternatively, the valve port can be directly located on the valve body, eliminating the valve seat. When the electric valve 100 is in operation, the current passing through the winding 12 of the stator assembly 1 is controlled to change according to a predetermined rule, thereby controlling the stator assembly 1 to generate a changing excitation magnetic field. Under the action of the excitation magnetic field, the rotor assembly 31 rotates. The rotor assembly 31 can directly or indirectly drive the valve core 32 to move relative to the valve port 331 and adjust the opening of the valve port 331 to achieve flow adjustment and on-off control of the system. Here, it is explained that if the stator assembly 1 is located on the periphery of the casing 9, the designated subassembly is located outside the casing wall, rather than on the casing wall. Other references to the periphery in this article should be understood in the same way.

[0017] The stator assembly 1 also includes a stator housing 11, a frame 13, and an injection molding section 14. The windings 12 are located within the stator housing 11, and the frame 13 provides support for the windings 12. The injection molding section 14 is formed by integrally molding the windings 12, the frame 13, and the stator housing 11 as an injection-molded insert. The injection molding section 14 has a first cavity 141 and a second cavity 142. The first cavity 141 and the second cavity 142 are not connected. The first cavity 141 is located above the windings 12, and the second cavity 142 is located in the middle of the stator assembly 1. The first cavity 141 and the second cavity 142 are separated by a first cover 143 of the injection molding section 14. The circuit board 2 is located in the first cavity 141, and the windings 12 are electrically and / or signal-connected to the circuit board 2. A cover plate 15 is provided above the first cavity 141. The cover plate 15 is secured to the injection molding section 14 by welding. A second sealing ring 6 is provided between the cover plate 15 and the injection molding section 14 to seal the first cavity 141, preventing the ingress of moisture, impurities, and the like from affecting the normal operation of the circuit board 2. The valve component 3 is at least partially located in the second cavity 142 .

[0018] Combine Figure 2The valve component 3 also includes a connector 35, a nut 36, and a screw 37, and the electric valve also includes a tightening nut 38. The sleeve 9 is located in the second chamber 142, and part of the sleeve 9 is located between the rotor assembly 31 and the stator assembly 1, which plays an isolation role. The rotor assembly 31 is fixedly connected to one end of the screw 37. The inner wall of the nut 36 has an internal thread section 361, and the other end of the screw 37 passes through the nut 36 and is connected to the valve core 32. The outer peripheral wall of the screw 37 has an external thread section that cooperates with the internal thread section 361. The internal thread of the screw 37 and the external thread of the nut 36 cooperate with each other to convert the rotation of the rotor assembly into axial movement of the valve core 32. In this embodiment, the nut 36 is fixedly connected to the connector 35, the valve seat 33 is connected to the connector 35, the valve seat 33 is located in the valve body 4, and the valve core 32 is at least partially located in the valve seat 33. The connector 35 has a flange portion 351, the lower end surface of which abuts the valve body 4. A compression nut 38 is sleeved on the radially outer periphery of the side wall of the main body of the connector 35. The compression nut 38 contacts the upper end surface of the flange portion 351. The compression nut 38 is threadedly connected to the valve body 4, thereby securing the connector 35 to the valve body 4. The electric valve further includes a pressure plate 7, through which the stator assembly 1 is securely connected to the valve body 4. The pressure plate 7 has a generally L-shaped cross-section. A portion of the pressure plate 7 is securely connected to the stator assembly 1, while the other portion of the pressure plate 7 can be securely connected to the valve body 4 by threading or other means. When the stator assembly 1 generates an excitation magnetic field, the rotor assembly 31 drives the screw rod 37 to rotate together under the action of the excitation magnetic field. At the same time, the screw rod 37 and the nut 36 are threaded together to drive the valve core 32 to move axially. The valve core 32 changes the flow cross-sectional area of the working medium at the valve port 331 by approaching and moving away from the valve port 331, thereby forming throttling and / or on-off of the working medium at the valve port 331.

[0019] See also Figure 1 、 2 The stator assembly 1 also has a recess 144, which is located in the injection molding portion 14 and is formed by injection molding. At least part of the opening of the recess 144 faces the valve body 4. The recess 144 is located between the valve component 3 and the stator assembly 1. The recess 144 is also located between the valve body 4 and the stator assembly 1. Specifically, the recess 144 is located in the injection molding portion 14 near the valve body 4 and the sleeve 9 and is located on the outer periphery of the sleeve 9. The electric valve 100 also includes a support pad 34 and a first sealing ring 5. The support pad 34 is fixedly connected to the compression nut 38. From an axial perspective, the recess 144 is located between the support pad 34 and the injection molding portion 14. From a radial perspective, the recess 144 is located between the sleeve 9 and the injection molding portion 14. The first sealing ring 5 is located within the recess 144. See Figure 4The recess 144 has a first mounting surface 1441, a second mounting surface 1442, and a connecting portion 1443. The first mounting surface 1441 is substantially perpendicular to the main body sidewall of the sleeve 9 and is disposed opposite the valve body 4. The second mounting surface 1442 is disposed opposite the outer peripheral surface of the sleeve 9. The second mounting surface 1442 is connected to the first mounting surface 1441 via a connecting portion. The connecting portion 1443 is arc-shaped. Of course, the recess 1444 may not have a connecting portion, and the second mounting surface 1442 and the first mounting surface 1441 may be directly connected. In the radial direction, the outer side of the first sealing ring 5 abuts the second mounting surface 1442, and the inner side of the first sealing ring 5 abuts the sidewall of the sleeve 9. In the axial direction, the first sealing ring 5 is limited by the first mounting surface 1441. The first sealing ring 5 is located above the support pad 34 and abuts the upper surface of the support pad 34. The first sealing ring 5 is squeezed by the sleeve 9, the stator assembly 1, and the valve body 4 to produce radial deformation. The support pad 34 is supported on the clamping nut 38, and the clamping nut 38 is connected to the valve body for limiting position. The first sealing ring 5 is supported on the support pad 34, which is equivalent to indirect limiting of part of the first sealing ring 5 and the valve body 4. The valve body 4 provides at least partial support for the first sealing ring 5.

[0020] The structure of the compression nut 38 is as follows: Figure 6 As shown, the outer peripheral wall of the compression nut 38 has an external thread (the external thread is not shown in the figure), and the compression nut 38 has two recesses 381. The function of these two recesses 381 is that the tooling can act on these two recesses 381 to tighten the compression nut 38 and the valve body 4 through the threads during assembly. In order to make the changes to the original electric valve structure as little as possible, this embodiment adds a support pad 34 based on the compression nut 38 structure. Its structure is as follows Figure 5 As shown, the support pad 34 primarily supports the first sealing ring 5, allowing the first sealing ring 5 to indirectly abut against the valve body 4, making the first sealing ring more stable and secure. To limit the rotation of the support pad 34 relative to the compression nut 38, the lower end of the support pad 34 also has two positioning bosses 341. The positioning bosses 341 match the recesses 381 of the compression nut 38. Pressing the positioning bosses 341 of the support pad into the recesses 381 of the compression nut 38 can limit the support pad 34, reducing damage to the first sealing ring 5 caused by shaking or rotation of the support pad 34 during vibration of the electric valve.

[0021] The first mounting surface 1441 and the second mounting surface 1442 are planes in this embodiment. There is an angle α between the second mounting surface 1442 and the side wall of the sleeve body, and the angle α is greater than 0° and less than 90°. The second mounting surface 1442 is located on the side away from the sleeve 9. In the direction presented in the figure, the end of the recess 144 close to the winding 12 is narrow, and the end of the recess 144 close to the valve body 4 / support pad 34 is wide, presenting a structure that is narrow at the top and wide at the bottom. Figure 1In the illustrated electric valve structure, to minimize the remaining structural dimensions and ensure that the first sealing ring achieves a certain compression ratio, such as 25% to 35%, the included angle α can be selected between 5° and 18° while meeting structural constraints. The included angle α can be adjusted appropriately based on the specific dimensions of the electric valve.

[0022] Figure 4 The middle angle α is specifically 10°, Figure 4 Omitted some Figure 3 Of course, the first mounting surface 1441 and the second mounting surface 1442 are not limited to planes (the plane in this specification is a plane in a broad sense, including smooth planes, surfaces with roughness that are flat to the naked eye, etc.), but can also be curved surfaces with an arc. In this case, the angle α between the second mounting surface and the sleeve is the angle between the tangent surface of the second mounting surface and the sleeve.

[0023] The present technical solution also provides an assembly method for the above-mentioned electric valve, comprising the following steps:

[0024] Assemble the valve component 3 and the sleeve 9 to form a valve component and sleeve assembly, assemble the valve component and sleeve assembly and the valve body 4, and tighten the clamping nut 38 to limit the connection between the valve component and the sleeve assembly and the valve body 4 to form a valve seat assembly; insert the support pad 34 from the upper end of the sleeve 9 and make contact with the clamping nut 38, and insert the positioning boss 341 of the support pad 34 into the pit 381 of the clamping nut 38, so that the support pad 34 and the clamping nut 38 are limited.

[0025] The limiting connection between the valve component, the sleeve assembly and the valve body includes tightening the clamping nut 38 to limit the connection between the valve component, the sleeve assembly and the valve body 4 to form a valve seat assembly. The specific operation is: insert the clamping nut 38 from the upper end of the sleeve 9 until it is against the valve body 4, and use the tooling to act on the pit 381 of the clamping nut 38 to fix the clamping nut 38 and the valve body 4 through threads, thereby fixing the valve body 4, the valve component and the sleeve assembly.

[0026] The assembly of the first sealing ring includes inserting the first sealing ring 5 from the upper end of the sleeve 9 and abutting against the support pad 34 .

[0027] The limiting connection between the stator assembly and the valve body includes: fixing the pressure plate 7 to the stator assembly 1, aligning the second cavity 142 of the stator assembly 1 with the sleeve 9, aligning the recess 144 with the position of the first sealing ring 5, and applying downward force to press the stator assembly 1 until it abuts against the valve body 4 and the first sealing ring 5 is located in the recess 144, and then fixing the pressure plate 7 to the valve body 4 by means of screws 8.

[0028] The assembly of the electric valve also includes the following steps: assembling the stator assembly 1 and the circuit board 2, sealing the cover plate 15 and the injection molding part 14 through the second sealing ring 6 and welding them to fix; this step can be placed before or after the stator assembly and the valve body are limitedly connected.

[0029] This embodiment sets the angle α to facilitate the discharge of air from the recess 144 during the process of pushing the first sealing ring 5 into the recess 144, thereby reducing the difficulty of assembly and also reducing the wear of the first sealing ring 5 during assembly. The assembled first sealing ring 5 can, to a certain extent, isolate the metal material in the injection molding portion 14 of the stator assembly from the outside world, reduce the possibility of external moisture or impurities entering the interior of the stator assembly 1, and reduce the risk of corrosion of metal materials such as the winding 12 and the stator housing 11, as well as damage to the circuit board 2. If the second mounting surface 1442 of the recess 144 does not deviate from the angle α of the sleeve, when installing the stator assembly 1, when the stator assembly 1 is lowered toward the valve seat assembly, an air spring is easily formed between the recess 144 of the stator assembly and the valve seat assembly, and the stator assembly 1 will become increasingly difficult to put on. Moreover, even if the stator assembly 1 and the valve seat assembly are assembled by brute force, after tightening the screws 8 of the pressure plate 7, the air spring formed will cause a force to separate the stator assembly and the valve seat assembly for a long time, so that the pressure plate 7 that fixes the stator assembly 1 and the valve body 4 is continuously subjected to force. Over time, the pressure plate 7 will be deformed and the relative distance between the stator assembly and the valve seat assembly will increase.

[0030] This technical solution also provides another embodiment of the electric valve. Different from the previous embodiment, the clamping nut 38 and the support pad 34 in this embodiment are designed as a whole. Figure 7 As shown, the compression nut and support pad designed as one piece are hereinafter referred to as one-piece 38a. The lower end of the one-piece 38a is the compression nut of Example 1, and the upper end of the one-piece 38a is the support pad of Example 1. The entire one-piece is also provided with two recesses 381a, which function similarly to the recesses 381 of Example 1. During assembly, tooling can act on these two recesses 381a to screw the one-piece 38a and the valve body 4 together via threads. By designing the compression nut and support pad as one piece, the assembly steps can be simplified (the limiting connection between the support pad and the compression nut can be omitted), thereby improving assembly efficiency.

[0031] The corresponding electric valve assembly method includes the following steps:

[0032] Assemble the valve component 3 and the sleeve to form a valve component and sleeve assembly, assemble the valve component and sleeve assembly with the valve body 4, and tighten the integrated piece 38a to limit the connection between the valve component and sleeve assembly and the valve body 4 to form a valve seat assembly;

[0033] The assembly of the first sealing ring includes inserting the first sealing ring 5 from the upper end of the sleeve 9 and abutting against the upper end of the integral part 38a (equivalent to the support pad in the first embodiment);

[0034] The limiting connection between the stator assembly and the valve body includes: fixing the pressure plate 7 to the stator assembly 1, aligning the second cavity 142 of the stator assembly 1 with the sleeve 9, aligning the recess 144 with the position of the first sealing ring 5, and applying downward force to press the stator assembly 1 until it abuts against the valve body 4 and the first sealing ring 5 is located in the recess 144, and then fixing the pressure plate 7 to the valve body 4 by means of screws 8.

[0035] 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 this specification has described the present invention in detail 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. An electric valve comprising a stator assembly, a valve component, a valve body, and a sleeve, wherein the stator assembly is located on the outer periphery of the sleeve and is positionally or fixedly connected to the valve body, characterized in that: The electric valve also includes a first sealing ring, the stator assembly has a recess, at least part of the recess is opened toward the valve body, the first sealing ring is located in the recess, the recess is located at the outer periphery of the sleeve, and the first sealing ring is located between the valve body and the stator assembly; the recess has a first mounting surface and a second mounting surface, in the radial direction, the inner side of part of the first sealing ring abuts against the outer periphery of the sleeve, and the outer side of the first sealing ring abuts against the second mounting surface, the valve component is connected to the valve body by a clamping nut, the lower end face of the first sealing ring abuts against the support pad, the support pad is supported by the clamping nut, and the support pad is located at the upper end of the clamping nut.

2. The electric valve according to claim 1, wherein: An included angle α is formed between the second mounting surface and the side wall of the sleeve, and the included angle α is greater than 0° and less than 90°. The second mounting surface is arranged opposite to the outer peripheral surface of the sleeve.

3. The electric valve according to claim 2, characterized in that The included angle α is greater than or equal to 5° and less than or equal to 18°.

4. The electric valve according to any one of claims 1 to 3, characterized in that: The sleeve is connected to the valve component in a limiting manner, the support pad is connected to the compression nut in a limiting manner, or the support pad and the compression nut are integrated, and a portion of the recess opens toward the support pad.

5. The electric valve according to any one of claims 1 to 4, characterized in that: The valve component includes a connecting piece, the clamping nut is sleeved on the connecting piece, and the clamping nut is positionally connected to the connecting piece.

6. The electric valve according to claim 4 or 5, characterized in that: The support pad is positionally connected to the clamping nut, the outer peripheral wall of the clamping nut has an external thread, the valve body has an internal thread, and the clamping nut is threadedly connected to the valve body.

7. The electric valve according to claim 6, characterized in that The compression nut further has at least two recesses, and the support pad has at least two protrusions. The recesses cooperate with the protrusions to limit the support pad.

8. The electric valve according to claim 4 or 5, characterized in that: The support pad and the clamping nut are an integral part, the outer peripheral wall of the integral part has an external thread, the valve body has an internal thread, and the integral part is threadedly connected to the valve body; the integral part also has at least two pits, and the lower end face of the first sealing ring abuts against the integral part.

9. The electric valve according to any one of claims 1 to 8, characterized in that: The stator assembly also includes a stator housing, a winding, a skeleton, and an injection molding part. The winding is located inside the stator housing, the skeleton provides support for the winding, and the injection molding part is formed by integrally injecting the winding, skeleton, and stator housing as an injection insert. The recess is located in the injection molding part.

10. The electric valve according to claim 9, wherein: The injection molding part has a first cavity and a second cavity, and the electric valve also has a circuit board. The circuit board is located in the first cavity and is electrically / signally connected to the winding; at least part of the second cavity is located in the middle of the stator assembly, and at least part of the sleeve is located in the second cavity.

Images