Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve body, a coil assembly, a valve component and a first filter, the valve component is assembled with the valve body, the coil assembly is fixedly connected with the valve body, the valve component comprises a valve seat component and a valve needle, the valve seat component comprises a valve seat and a connecting seat, and the connecting seat is fixedly connected with the valve needle. The valve seat is fixedly connected with the connecting seat, the valve seat comprises a valve port, a circulation hole and a valve seat inner cavity, the coil assembly drives the valve needle to move relative to the valve port, the valve body comprises a valve body cavity and a first channel, the first channel is communicated with the valve body cavity, the valve body cavity communicates with the valve seat inner cavity through the circulation hole, and the first channel is communicated with the valve seat inner cavity through the circulation hole. Part of the valve component is located in the valve body cavity, the first filter comprises a support and a filter screen, the filter screen is fixedly connected with the support, and the first filter is clamped to the periphery of the valve seat in a surrounding mode and wraps the circulation hole; the filter is easy to install, and cost of the electronic expansion valve can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, and in particular to an electronic expansion valve. Background Technology

[0002] Refrigeration systems include compressors, evaporators, condensers, throttling elements, and reversing valves, typically using electronic expansion valves as throttling elements. Existing technology 202121723653.4 discloses an electric valve including a filter device located within the valve body cavity. The filter device includes a support and a filter screen, with the filter screen fixedly connected to the support. One end of the support is limited by the valve body or a connecting seat, and the other end is limited by the valve seat or the valve body. The filter device surrounds the outer periphery of the valve seat. A first buffer chamber exists between the filter screen and the side wall surrounding the valve body cavity, and a second buffer chamber exists between the filter screen and the valve seat. The first buffer chamber is directly connected to a first channel, and the second buffer chamber is directly connected to the inner cavity of the valve seat through a flow hole. The first and second buffer chambers are connected through the filter screen. This configuration facilitates the installation of the filter device and increases its filtration area. However, the filter device is complex to install, making it unsuitable for mass production. Utility Model Content

[0003] The purpose of this invention is to provide an electronic expansion valve with a simple filter installation, which can reduce the cost of the electronic expansion valve.

[0004] This utility model provides an electronic expansion valve, including a valve body, a coil assembly, and a valve component. The valve component is assembled with the valve body, and the coil assembly is fixedly connected to the valve body. The valve component includes a valve seat component and a valve needle. The valve seat component includes a valve seat and a connecting seat. The valve seat is fixedly connected to the connecting seat. The valve seat includes a valve port, a flow hole, and a valve seat cavity. The coil assembly drives the valve needle to move relative to the valve port. The valve body includes a valve body cavity and a first channel. The first channel communicates with the valve body cavity. The valve body cavity flows through the flow hole to the inner cavity of the valve seat. Part of the valve component is located in the valve body cavity. The electronic expansion valve further includes a first filter. The first filter includes a bracket and a filter screen. The filter screen is fixedly connected to the bracket. The first filter is snapped around the outer periphery of the valve seat and covers the flow hole.

[0005] In some embodiments, the bracket includes a longitudinal groove that extends through both longitudinal end faces of the bracket.

[0006] In some embodiments, the bracket includes an opening with a protrusion at one end and a recess at the other end, the protrusion and the recess being snap-fitted together.

[0007] In some embodiments, the recessed groove is wider at the inside and narrower at the outside, and the head of the protrusion is wider than the root.

[0008] In some embodiments, the valve seat has an annular groove on its outer periphery, into which the first filter is placed.

[0009] In some embodiments, the electronic expansion valve further includes a second filter comprising multiple layers of spaced-apart second filter screens, the second filter being located outside the valve port and fixed to the lower end of the valve body cavity.

[0010] In some embodiments, the second filter is cylindrical, with the bottom of the cylinder near the valve port.

[0011] In some embodiments, the ends of the multi-layered, spaced-apart second filter screens are fixed with an annular bracket.

[0012] In some embodiments, the valve seat includes a flared channel, and the bottom of the second filter is hemispherical, extending into the flared channel.

[0013] In some embodiments, the bottom of the second filter cylinder maintains a predetermined gap with the flared channel.

[0014] The electronic expansion valve of this invention has a first filter that is snapped around the outer periphery of the valve seat and covers the flow hole. The filter is easy to install and can reduce the cost of the electronic expansion valve. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the electronic expansion valve according to an embodiment of the present invention;

[0016] Figure 2 This is an embodiment of the present utility model. Figure 1 A schematic diagram of the coil assembly and valve components;

[0017] Figure 3 This is a schematic diagram of the structure of the electronic expansion valve in one direction according to an embodiment of this utility model;

[0018] Figure 4 This is an embodiment of the present utility model. Figure 1 Schematic diagram of the opening state of the three-dimensional structure of the first filter;

[0019] Figure 5 This is an embodiment of the present utility model. Figure 1 A schematic diagram of the first filter's three-dimensional structure in the snap-fit ​​state. Detailed Implementation

[0020] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0021] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0022] refer to Figures 1 to 5 As shown, according to an embodiment of this utility model, the electronic expansion valve includes a valve body 1, a coil assembly 2, and a valve component 3. The valve component 3 is assembled with the valve body 1, and the coil assembly 2 is fixedly connected to the valve body 1. The coil assembly 2 includes a stator 21, an injection-molded body 22, and a connector 23. Part of the injection-molded body 22 covers the stator 21, and the stator 21 and the connector 23 are connected by pins inside. The valve component 3 includes a valve seat component 31, a magnetic rotor 32, a screw 33, a nut 34, a sleeve 35, and a valve needle 36. The lower end of the sleeve 35 is connected to the valve seat component 31 by welding. Part of the sleeve 35 is located between the magnetic rotor 32 and the stator 21. The valve seat component 31 includes a valve seat 311 and a connecting seat 312. The coil assembly 2 drives the magnetic rotor 32 to rotate the screw 33. The screw 33 and the nut 34 are threadedly engaged, causing the valve needle 36 to move up and down relative to the valve port 3112. The valve component is connected to the valve body through the external thread of the adapter seat. The outer periphery of the nut includes a guide rail and a slip ring. The magnetic rotor drives the slip ring to move along the guide rail to the upper and lower stop points, limiting the upper and lower movement limits of the valve needle.

[0023] The valve body 1 includes a first channel 11, a second channel 12, a valve body cavity 13, and a third channel 14. At least a portion of the valve seat component 31 is located in the valve body cavity 13. In this embodiment, the first channel 11 serves as an inlet channel, and the second channel 12 serves as an outlet channel. At least a portion of the valve seat 311 has a generally cylindrical sidewall, and along the height direction of the electronic expansion valve, the valve seat 311 is located at a relatively lower position on the valve seat component 31. The valve seat 311 includes a valve seat inner cavity 3113 and a flow hole 3114. The first channel 11 is directly connected to the valve body cavity 13, and the valve body cavity 13 is connected to the valve seat inner cavity 3113 through the flow hole 3114. The second channel 12 is directly connected to the valve body cavity 13, and the second channel 12 flows through the valve seat inner cavity 3113 through the valve port 3112.

[0024] The electronic expansion valve includes a first filter 4. A valve seat 311 has an annular groove on its outer periphery. The first filter is placed in the annular groove for axial positioning. The first filter 4 includes a bracket 41 and a filter screen 42. The bracket is made of plastic, and the filter screen is not less than 80 mesh. The filter screen and bracket are fixedly connected by injection molding. The filter screen is close to the outer side of the bracket. The first filter 4 is snapped around the outer periphery of the valve seat and covers the flow hole 3114. The filter screen maintains a predetermined distance from the bottom of the annular groove to increase the flow area. The bracket includes an opening circumferentially. One end of the opening has a protrusion 411, and the other end has a recess 412. The recess is wider at the inside than at the outside, and the head of the protrusion is wider than the root. The protrusion 411 and the recess 412 are snapped together. The bracket 41 includes a longitudinal groove 413 that penetrates both longitudinal end faces of the bracket. When installing the first filter, the bracket opening is opened, and the filter is snapped into the annular groove, where the protrusion and recess are snapped together. The longitudinal groove has a relatively thin wall, making it easy to open the bracket opening. The filter is easy to install via snap-fit ​​connection, which can reduce the cost of electronic expansion valves.

[0025] The electronic expansion valve includes a second filter 5, which comprises multiple layers of spaced-apart second filter screens 51. In this embodiment, there are three layers of filter screens, with a spacing of not less than 1 mm between them and a mesh size of not less than 80 mesh. The ends of the multiple layers of spaced-apart second filter screens 51 are welded together using an annular bracket 52. The second filter 5 is cylindrical, with a hemispherical bottom 511. The bottom of the cylinder is located near the valve port to increase the flow area. The second filter 5 is located outside the valve port and fixed to the lower end of the valve body cavity. The valve seat includes a flared channel 3115. The bottom 511 of the second filter 5 extends into the flared channel, maintaining a predetermined gap between the bottom 511 and the flared channel 3115, ensuring that the medium flows not only through the bottom but also through the side of the cylinder, thus guaranteeing sufficient flow area. The second filter, located outside the valve port, can disperse high-speed flowing medium bubbles and reduce noise.

[0026] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electronic expansion valve, comprising a valve body, a coil assembly, and a valve component, wherein the valve component is assembled with the valve body, the coil assembly is fixedly connected to the valve body, the valve component includes a valve seat component and a valve needle, the valve seat component includes a valve seat and a connecting seat, the valve seat is fixedly connected to the connecting seat, the valve seat includes a valve port, a flow hole, and a valve seat cavity, the coil assembly drives the valve needle to move relative to the valve port, the valve body includes a valve body cavity and a first channel, the first channel communicating with the valve body cavity, the valve body cavity communicating with the valve seat cavity through the flow hole, and a portion of the valve component is located in the valve body cavity, characterized in that... The electronic expansion valve also includes a first filter, which includes a bracket and a filter screen. The filter screen is fixedly connected to the bracket, and the first filter is snapped around the outer periphery of the valve seat and covers the flow hole.

2. The electronic expansion valve according to claim 1, characterized in that, The bracket includes a longitudinal groove that extends through both longitudinal end faces of the bracket.

3. The electronic expansion valve according to claim 1, characterized in that, The bracket includes an opening, one end of which has a protrusion and the other end of which has a recess, the protrusion and the recess being snapped together.

4. The electronic expansion valve according to claim 3, characterized in that, The groove width of the concave part is wider at the inside and narrower at the outside, and the width of the head of the convex part is greater than that of the root.

5. The electronic expansion valve according to claim 1, characterized in that, The valve seat has an annular groove on its outer periphery, and the first filter is placed in the annular groove.

6. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve also includes a second filter, which comprises multiple layers of spaced-apart second filter screens. The second filter is located outside the valve port and fixed to the lower end of the valve body cavity.

7. The electronic expansion valve according to claim 6, characterized in that, The second filter is cylindrical, with the bottom of the cylinder near the valve port.

8. The electronic expansion valve according to claim 6, characterized in that, The second filter screens, which are spaced apart from each other in multiple layers, are fixed at their ends with a ring-shaped bracket.

9. The electronic expansion valve according to claim 7, characterized in that, The valve seat includes a flared channel, and the bottom of the second filter is hemispherical, extending into the flared channel.

10. The electronic expansion valve according to claim 9, characterized in that, The bottom of the second filter cylinder maintains a predetermined gap with the flared channel.

Images