Electric valve

Abstract

A movable sealing assembly is located in a valve cavity, part of a valve rod is located in the valve cavity, the movable sealing assembly comprises a piston, a first sealing piece, a second sealing piece and a third sealing piece, the first sealing piece surrounds the valve rod and is axially pressed between a valve body and the piston, and the second sealing piece surrounds the valve rod and is axially pressed between the valve body and the piston. The second sealing piece is pressed between the valve rod and the piston in the radial direction, the third sealing piece is pressed between the piston and the valve body in the radial direction, and a cavity is formed between the piston and the valve body and filled with lubricating oil. The electric valve further comprises a spring, the spring surrounds the valve rod, the lower end of the piston abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block. By arranging the lubricating oil cavity, lubrication of the dynamic sealing assembly is maintained, low friction force between the dynamic sealing assembly and the valve rod is reduced, and the reliability that the driving component drives the valve block to rotate is ensured.

Description

Technical Field

[0001] The utility model relates to the field of automotive air conditioners, in particular to an electric valve. Background Art

[0002] The prior art such as utility application 202320882635.3 discloses an electric valve, which includes a driving component, a valve body and a valve block. The electric valve is provided with a valve cavity, and the valve block is arranged in the valve cavity. The driving component can drive the valve block to act. The electric valve includes a valve seat integrally formed with, relatively fixed to or limitedly arranged with the valve body. The valve seat is relatively located at the bottom of the valve cavity. The valve seat is provided with a first through hole, a second through hole, a third through hole, a fourth through hole and a fifth through hole. The electric valve is provided with a first interface, a second interface, a third interface, a fourth interface and a fifth interface. The first interface, the second interface, the third interface, the fourth interface and the fifth interface are respectively communicated with the first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole. The valve block can act relative to the valve seat, and the valve block is in sliding fit with the valve seat on the surface facing the valve seat. The valve block is provided with a first groove and a second groove on the surface opposite to the valve seat. By rotating the valve block, when the second interface and the third interface are communicated, the fourth interface and the fifth interface are communicated. When the first interface and the second interface are communicated, the third interface and the fourth interface are communicated. Among them, when the valve block rotates to control the first groove to communicate the second through hole and the third through hole, the second groove communicates the fourth through hole and the fifth through hole. When the valve block rotates to control the first groove to communicate the first through hole and the second through hole, the second groove communicates the third through hole and the fourth through hole. Among them, a shaft seal assembly is used to ensure the isolation of the refrigeration medium from the outside. The shaft seal assembly includes a gland, a U-shaped sealing ring, a T-shaped sealing ring and a rubber O-ring. The rotation shaft is sealed by pressing the gland with a pressing ring. However, the shaft seal assembly needs to be regularly maintained and lubricated to ensure low friction between it and the valve stem and ensure the reliability of the driving component to drive the valve block to rotate. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide an electric valve.

[0004] The technical solution of the present utility model is as follows: an electric valve, comprising a driving component, a valve body, a valve stem and a valve block. The electric valve is provided with a valve cavity, and the valve block is arranged in the valve cavity. The driving component can drive the valve stem to rotate, and the valve stem drives the valve block to act. The electric valve includes a valve seat integrally formed with, relatively fixed to, or limitedly arranged with the valve body. The valve seat is relatively located at the bottom of the valve cavity. The valve seat is provided with at least a first through hole and a second through hole. The electric valve is provided with at least a first interface and a second interface, and the first interface and the second interface are respectively communicated with the first through hole and the second through hole. The valve block can rotate relative to the valve seat, and the valve block is in sliding fit with the valve seat on the surface facing the valve seat. By rotating the valve block, the communication or closing of the first interface and the second interface is controlled. It is characterized in that: the electric valve further includes a dynamic sealing assembly. The dynamic sealing assembly is located in the valve cavity, and part of the valve stem is located in the valve cavity. The dynamic sealing assembly includes a piston, a first seal, a second seal and a third seal. The first seal surrounds the valve stem and is axially pressed between the valve body and the piston. The second seal is radially pressed between the valve stem and the piston. The third seal is radially pressed between the piston and the valve body. A chamber is formed between the piston and the valve body, and the chamber is filled with lubricating oil. The electric valve further includes a spring. The spring surrounds the valve stem. The lower end of the piston abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block.

[0005] Further, the electric valve further includes a plurality of gaskets. Along the axis of the gasket, the gasket is located between the lower end of the piston and the valve block. The lower end of the gasket abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block.

[0006] Further, the valve body includes a first stepped hole section. The diameter of the first stepped hole section is larger than the diameter of the valve stem, and a first sealing ring is placed in the first stepped hole section.

[0007] Further, the valve body includes a second stepped hole section. The piston includes a small-diameter section and a large-diameter section. The diameter of the second stepped hole section is larger than the diameter of the small-diameter section of the piston, and the bottom surface of the second stepped hole section abuts against the end surface of the small-diameter section of the piston.

[0008] Further, the valve body includes a third stepped hole section, and the third stepped hole section is in clearance fit with the large-diameter section of the piston.

[0009] Further, the small-diameter section of the piston includes an oil inlet hole communicating with the outer circumference of the valve stem.

[0010] Further, the piston includes an annular lubricating groove surrounding the valve stem.

[0011] Further, the electric valve includes a central shaft, the valve block includes a central through hole, and the central shaft passes through the central through hole and is in guiding cooperation with the valve rod.

[0012] Further, the electric valve further includes a driving head, the driving head includes a radial limiting post, a limiting groove is provided at the top end of the valve body, and the limiting post is in cooperation with the limiting groove for limiting.

[0013] Further, the electric valve includes a bracket with screw holes provided on both the side surface and the upper end surface. The driving component is fixedly connected to the upper end of the bracket by screws, and the bracket is fixedly connected to the valve body by screws.

[0014] The electric valve of the present utility model includes a driving component, a valve body, a valve rod, a valve block and a dynamic sealing component. The dynamic sealing component is located in the valve cavity, and part of the valve rod is located in the valve cavity. The dynamic sealing component includes a piston, a first sealing member, a second sealing member and a third sealing member. The first sealing member surrounds the valve rod and is axially pressed between the valve body and the piston. The second sealing member is radially pressed between the valve rod and the piston. The third sealing member is radially pressed between the piston and the valve body. A chamber is formed between the piston and the valve body, and the chamber is filled with lubricating oil. The electric valve further includes a spring. The spring surrounds the valve rod. The lower end of the piston abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block. By providing the lubricating oil chamber, the lubrication of the dynamic sealing component is maintained, the low friction force between it and the valve rod is reduced, and the reliability of the driving component driving the valve block to rotate is ensured. Description of the Drawings

[0015] Figure 1 is a schematic cross-sectional structure view of an embodiment of the electric valve of the present utility model;

[0016] Figure 2 is the present utility model Figure 1 exploded structure view of the driving component, the bracket and the driving head;

[0017] Figure 3 is the present utility model Figure 1 bottom view structure view;

[0018] Figure 4 is the present utility model Figure 1 schematic structure view of the valve seat;

[0019] Figure 5 is the present utility model Figure 1 schematic structure view of the valve block;

[0020] Figure 6 is the present utility model Figure 1 exploded structure view of the valve body, the shaft seal assembly and the valve rod. Detailed Embodiments

[0021] The technical solution of the present utility model will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0022] See Figures 1 to 6 As shown, this embodiment discloses an electric valve, which can be applied to refrigerant circuits such as automotive air-conditioning systems. The electric valve includes a valve body 1 and a driving component 4. The valve body 1 includes a valve cavity with one end open, and a valve seat 2 and a valve block 3 are arranged in the valve cavity. A dynamic sealing component 6 is arranged at one end of the valve cavity. The driving component 4 drives the driving head 5 to rotate, the driving head 5 drives the valve stem 7 to rotate, the valve stem 7 drives the valve block 3 to rotate, and the rotation center of the output end of the driving component 4 and the rotation center of the valve block 3 are located on the same axis. The valve seat 2 is relatively located at the bottom of the valve cavity. The open end of the valve cavity of the valve body 1 is connected to the valve seat by screws, and can also be fixed by welding or other means, or a valve seat integrated with the valve body can be adopted. The driving component is generally a motor, and the motor can directly drive the valve block to act, or the motor can directly drive a reduction mechanism, and the reduction mechanism drives the valve block to act. Among them, the electric valve includes a plastic bracket 10 with screw holes provided on both the side surface and the upper end surface. The driving component 4 is fixedly connected to the upper end of the bracket 10 by screws, and the bracket 10 is fixedly connected to the valve body 1 by screws. By installing the driving component through the bracket, the radial installation dimension at the upper end of the valve body is reduced. In this embodiment, the driving head 5 includes a radial limiting post 51, and a limiting groove 101 is provided at the top of the valve body. The limiting post cooperates with the limiting groove to limit the rotation angle of the valve block.

[0023] The valve seat is provided with a first through hole 201, a second through hole 202, a third through hole 203, a fourth through hole 204 and a fifth through hole 205. The electric valve is provided with a first interface 01, a second interface 02, a third interface 03, a fourth interface 04 and a fifth interface 05. The first interface, the second interface, the third interface, the fourth interface and the fifth interface are respectively communicated with the first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole. The distances between the centers of the first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole and the rotation center of the valve seat are the same, and the first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole are evenly distributed along the circumference with the rotation center of the valve seat as the center. The valve block 3 can rotate relative to the valve seat, and the valve block slides on the surface facing the valve seat. The valve block 3 is provided with a first groove 301 and a second groove 302 on the surface opposite to the valve seat 2.

[0024] In use, by rotating the valve block, when the second interface 02 and the third interface 03 are connected, the fourth interface 04 and the fifth interface 05 are connected, and when the first interface 01 and the second interface 02 are connected, the third interface 03 and the fourth interface 04 are connected. Among them, when the first groove 301 is controlled by the rotation of the valve block to connect the second through hole 202 and the third through hole 203, the second groove 302 connects the fourth through hole 204 and the fifth through hole 205, and the valve block 3 closes the first through hole 201 to cut off the first interface. When the first groove 301 is controlled by the rotation of the valve block to connect the first through hole 201 and the second through hole 202, the second groove 302 connects the third through hole 203 and the fourth through hole 204, and the valve block 3 closes the fifth through hole 205 to cut off the fifth interface. The valve block can rotate counterclockwise or clockwise and can rotate continuously to switch adjacent through holes. By adopting multiple grooves and five interfaces, more switching functions can be realized, and one of the interfaces can also be closed at the same time. The electric valve in this embodiment has 5 interfaces, and two interfaces can also be set. By rotating the valve block, the connection or disconnection of the first interface and the second interface can be controlled; three or more interfaces can also be set.

[0025] Combined Figure 1 with Figure 5 as shown, the valve block 3 has a disc structure. The valve block is divided into a disc portion 31 that fits and rotates with the valve seat for sealing and a flow portion 32 with a first groove 301 and a second groove 302 inside. On the disc portion of the side of the valve block opposite to the valve seat, there are a first blind hole 311, a second blind hole 312, a third blind hole 313, and a fourth blind hole 314. The first blind hole and the second blind hole communicate with the first groove 301, and the third blind hole and the fourth blind hole communicate with the second groove 302. It should be specifically noted that the blind hole specifically refers to a hole that does not penetrate the flow portion but only penetrates the disc portion. Among them, the valve block 3 is divided into an independent disc portion that fits and rotates with the valve seat for sealing and a flow portion with the first and second grooves. The disc portion and the flow portion are fixedly and sealedly connected by welding. Sealing seats 206 are provided for the first through hole, the second through hole, the third through hole, the fourth through hole, and the fifth through hole. The valve seat through hole is a stepped hole. The sealing seat 206 includes a stepped surface. Along the axial direction of the stepped hole, the sealing ring 207 is located between the stepped surface and the bottom wall of the stepped hole. For through holes with low sealing requirements, the sealing seat can be not used. In the figure, 4 through holes are installed with sealing seats, and the sealing seats are made of rubber or plastic. There is an isolation between the first blind hole and the second blind hole on the disc portion of the side of the valve block opposite to the valve seat, and there is also an isolation between the third blind hole and the fourth blind hole on the disc portion of the side of the valve block opposite to the valve seat. In this way, the through-hole diameter of the blind hole matches the through-hole diameter of the through hole, ensuring good sealing performance and flow capacity.

[0026] In this embodiment, the dynamic seal assembly 6 is located in the valve cavity, and part of the valve stem is located in this valve cavity. The dynamic seal assembly 6 includes a piston 61, a first seal 62, a second seal 63, and a third seal 64. The first seal 62 surrounds the valve stem 7 and is axially pressed between the valve body 1 and the piston 61. The second seal 63 is radially pressed between the valve stem 7 and the piston 61. The third seal 64 is radially pressed between the piston 61 and the valve body 1. A chamber 65 is formed between the piston 61 and the valve body 1, and the chamber is filled with lubricating oil. Among them, the valve body 1 sequentially includes a first stepped hole section, a second stepped hole section, and a third stepped hole section from top to bottom. The diameter of the first stepped hole section is larger than the diameter of the valve stem, and a first sealing ring is placed in the first stepped hole section. The piston includes a small-diameter section and a large-diameter section. The diameter of the second stepped hole section is larger than the diameter of the small-diameter section of the piston, and the bottom surface of the second stepped hole section abuts against the end surface of the small-diameter section of the piston. The third stepped hole section has a clearance fit with the large-diameter section of the piston. The small-diameter section of the piston includes an oil inlet hole 66 communicating with the outer circumference of the valve stem. The piston includes an annular lubricating groove 67 surrounding the valve stem, and the oil inlet hole communicates with the annular lubricating groove. By providing a lubricating oil chamber, the lubrication of the dynamic seal assembly is maintained, the low friction between it and the valve stem is reduced, and the reliability of the driving component to drive the valve block to rotate is ensured.

[0027] The electric valve is also provided with a thrust gasket 8 and a spring 9. The gasket is located in the valve cavity. Along the axis of the gasket 8, the gasket 8 is located between the lower end of the piston and the valve block 3, sleeved outside the valve stem 7. The lower end of the gasket abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block. The inner side of the flow-through part is arc-shaped to avoid the spring, making the valve block very compact. The spring applies a certain pre-tightening force to the valve block to ensure the sealing performance. The valve block has a disc structure, which is beneficial to the balance of the spring pressure and will not cause local seal failure due to skewed pressure. The lower end of the piston can also directly abut against the upper end of the spring, and the lower end of the spring abuts against the valve block. Through the spring, the piston and the valve block are simultaneously pressed, reducing the installation difficulty of the first sealing ring.

[0028] In addition, the electric valve includes a central shaft 12, and the valve block includes a central through hole 33. The central shaft passes through the central through hole 33 and is in guiding cooperation with the valve stem 7. The central shaft is in hole fit and guiding with the hole at the rotation center of the valve seat. The central shaft can be a hollow shaft, and a bushing is provided at the rotation center of the valve seat to reduce friction.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "surface", "periphery", "top end", "bottom", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Electric valve, comprising a driving component, a valve body, a valve stem and a valve block. The electric valve is provided with a valve cavity, and the valve block is arranged in the valve cavity. The driving component can drive the valve stem to rotate, and the valve stem drives the valve block to act. The electric valve includes a valve seat integrally formed with or relatively fixed or limitedly arranged with the valve body. The valve seat is relatively located at the bottom of the valve cavity. The valve seat is provided with at least a first through hole and a second through hole. The electric valve is provided with at least a first interface and a second interface. The first interface and the second interface are respectively communicated with the first through hole and the second through hole. The valve block can rotate relative to the valve seat, and the valve block is in sliding fit with the valve seat on the surface facing the valve seat. By rotating the valve block, the communication or closing of the first interface and the second interface is controlled. It is characterized in that, The electric valve further includes a dynamic sealing assembly. The dynamic sealing assembly is located in the valve cavity, and part of the valve stem is located in the valve cavity. The dynamic sealing assembly includes a piston, a first seal, a second seal, and a third seal. The first seal surrounds the valve stem and is axially pressed between the valve body and the piston. The second seal is radially pressed between the valve stem and the piston. The third seal is radially pressed between the piston and the valve body. A chamber is formed between the piston and the valve body, and the chamber is filled with lubricating oil. The electric valve further includes a spring. The spring surrounds the valve stem. The lower end of the piston abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block.

2. The electric valve according to claim 1, characterized in that, The electric valve further includes a plurality of gaskets. Axially along the gaskets, the gaskets are located between the lower end of the piston and the valve block. The lower end of the gasket abuts against the upper end of the spring, and the lower end of the spring abuts against the valve block.

3. The electric valve according to claim 1, characterized in that, The valve body includes a first stepped hole section. The diameter of the first stepped hole section is larger than the diameter of the valve stem, and a first sealing ring is placed in the first stepped hole section.

4. The electric valve according to claim 3, characterized in that, The valve body includes a second stepped hole section. The piston includes a small-diameter section and a large-diameter section. The diameter of the second stepped hole section is larger than the diameter of the small-diameter section of the piston, and the bottom surface of the second stepped hole section abuts against the end face of the small-diameter section of the piston.

5. The electric valve according to claim 4, characterized in that, The valve body includes a third stepped hole section, and the third stepped hole section has a clearance fit with the large-diameter section of the piston.

6. The electric valve according to claim 4, characterized in that, The small-diameter section of the piston includes an oil inlet hole communicating with the outer circumference of the valve stem.

7. The electric valve according to claim 4, characterized in that The piston includes an annular lubricating groove surrounding the valve stem.

8. The electric valve according to claim 1, wherein The electric valve includes a central shaft. The valve block includes a central through hole, and the central shaft passes through the central through hole and is in guiding cooperation with the valve stem.

9. The electric valve according to claim 1, characterized in that, The electric valve further includes a drive head. The drive head includes a radial limit post. A limit groove is provided at the top end of the valve body, and the limit post is in cooperation with the limit groove for limiting.

10. The electric valve according to claim 1, characterized in that, The electric valve includes a bracket with screw holes provided on both the side surface and the upper end surface. The driving component is fixedly connected to the upper end of the bracket by screws, and the bracket is fixedly connected to the valve body by screws.

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