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CN-122015353-A - Conical filter screen with spiral flow guiding function and electronic expansion valve

CN122015353ACN 122015353 ACN122015353 ACN 122015353ACN-122015353-A

Abstract

The invention provides a conical filter screen with a spiral flow guiding function and an electronic expansion valve, which comprise a filter screen body, wherein the filter screen body comprises a conical groove at one end and a conical flow guiding surface at the other end, and the conical points of the conical groove and the conical flow guiding surface face in the same direction. The conical flow guide surface is provided with a spiral flow guide structure. According to the invention, the conical flow guiding surface of the spiral flow guiding structure guides the refrigerant to flow, so that the refrigerant is uniformly dispersed through the filter screen body along the spiral path, the generation of vortex is inhibited, and the flow noise and energy loss are reduced. Two connecting pipes of the electronic expansion valve are respectively internally provided with filter screens with opposite conical points, so that one filter screen faces the refrigerant with the conical points under the working conditions of refrigeration and heating, and the spiral flow guide structure is matched to further inhibit vortex noise.

Inventors

  • WANG HENG
  • Wei Zixue
  • JIANG JINLIN

Assignees

  • 太仓京和机电有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. A conical filter screen with a spiral flow guiding function is characterized by comprising a filter screen body (1), wherein one end of the filter screen body (1) is provided with a conical groove (11), the other end of the filter screen body is provided with a conical flow guiding surface (12), conical points of the conical groove (11) and the conical flow guiding surface (12) face in the same direction, and the conical flow guiding surface (12) is provided with a spiral flow guiding structure (121).
  2. 2. The conical filter screen with spiral diversion function according to claim 1, wherein the spiral diversion structure (121) is a spiral bulge continuously extending along the conical diversion surface (12).
  3. 3. The conical filter screen with spiral flow guiding function according to claim 2, wherein the included angle between the spiral flow guiding structure (121) and the central axis of the filter screen body (1) is 20-25 degrees.
  4. 4. The conical filter screen with spiral diversion function according to claim 1, wherein the conical tip angle of the conical diversion surface (12) is 30-60 degrees.
  5. 5. The conical filter screen with spiral diversion function as set forth in claim 1, wherein the length of a conical generatrix of the conical groove (11) and the conical diversion surface (12) is larger than the radius of the conical bottom, so that the effective filtering area is larger than the circular plane area with the same bottom diameter.
  6. 6. The conical filter screen with the spiral flow guiding function according to claim 1, wherein the filter screen body (1) is of an integral structure without a spliced seam and a composite layer, and filter pores (13) are distributed on the filter screen body.
  7. 7. The conical filter screen with spiral flow guiding function according to claim 6, wherein the specification of the filter pores (13) is 80-120 meshes.
  8. 8. The conical filter screen with spiral flow guiding function according to claim 1, wherein the maximum outer diameter of the filter screen body (1) is 6.0mm-7.0mm and is used for adapting to a pipeline with the outer diameter of 8 mm.
  9. 9. The electronic expansion valve is characterized by comprising a valve body (2), wherein the valve body (2) is provided with a first connecting pipe (21) and a second connecting pipe (22), the first connecting pipe (21) and the second connecting pipe (22) are respectively provided with a flow passage for flowing a cooling medium, the first connecting pipe (21) and the second connecting pipe (22) are respectively provided with a first filter screen (23) and a second filter screen (24), and the first filter screen (23) and the second filter screen (24) are conical filter screens with spiral flow guiding functions according to any one of claims 1 to 8.
  10. 10. The electronic expansion valve according to claim 9, wherein the conical tip of the first filter is directed in the direction of the nozzle of the first connecting pipe (21), and the conical tip of the second filter is directed in the direction of the nozzle of the second connecting pipe (22), so that the conical tips of the first filter (23) and the second filter (24) are directed in opposite directions.

Description

Conical filter screen with spiral flow guiding function and electronic expansion valve Technical Field The invention belongs to the technical field of electronic expansion valves, and particularly relates to a conical filter screen with a spiral flow guiding function and an electronic expansion valve. Background The electronic expansion valve is a core throttling element of the refrigeration system, and an internal filter screen of the electronic expansion valve is usually arranged in a valve body flow channel and is used for filtering impurity particles in a refrigerant, preventing impurities from blocking a valve port or damaging a valve core, and ensuring long-term stable operation of the electronic expansion valve. Most of the filter screens adopted by the existing electronic expansion valves are flat filter screens, common single-cone filter screens or cylindrical filter screens. These screens are usually sintered from wire mesh or stainless steel powder metallurgy, enabling basic filtration functions. However, the existing filter screen is usually required to be contracted and processed in order to form a limit step to fix the filter screen. The filter screen has the defects that the effective filtering area of the flat plate-shaped filter screen is limited by the sectional area of a pipeline, so that the flow speed and the resistance of the refrigerant are increased when the refrigerant passes through the filter screen, and the common conical filter screen increases the filtering area to a certain extent, but the outer surface of the common conical filter screen is a smooth conical surface, and the flow guiding structure is lacking, so that vortex and energy loss are easy to generate when the refrigerant passes through the filter screen. And the electronic expansion valve needs to bear the bidirectional flow of the refrigerant in the refrigerating and heating modes, the existing filter screen can only adapt to unidirectional flow, and when the refrigerant reversely flows through the filter screen, larger vortex noise is easy to generate, so that the user experience is influenced. And part of the filter screen adopts a multi-sheet combined or composite layer structure, has a splice seam, and is easy to crack or fall off under the actions of refrigerant impact and temperature change for a long time, so that the filter is invalid. In view of the above, there is a need to develop a novel filter screen structure. Disclosure of Invention The invention aims to overcome the defects, and provides a conical filter screen with a spiral flow guiding function and an electronic expansion valve, which solve the technical problems that the existing filter screen is required to be contracted for processing, has large flow resistance, high bidirectional flow noise and poor structural reliability. In order to achieve the above purpose, the invention provides a conical filter screen with a spiral flow guiding function, which comprises a filter screen body, wherein the filter screen body comprises a conical groove at one end and a conical flow guiding surface at the other end, and the conical points of the conical groove and the conical flow guiding surface face in the same direction. The conical flow guide surface is provided with a spiral flow guide structure. When the refrigerant flows into the electronic expansion valve through the pipeline, the refrigerant flows in from the conical flow guide surface with the spiral flow guide structure and flows out from the conical groove, and when the refrigerant flows in, the spiral flow guide structure on the conical flow guide surface actively guides the flow of the refrigerant, so that the refrigerant is uniformly dispersed through the filter screen body along the spiral path, the generation of vortex is inhibited, and the flow noise and the energy loss are reduced. Further, in the conical filter screen with the spiral flow guiding function, the spiral flow guiding structure is a spiral bulge continuously extending along the conical flow guiding surface. The spiral bulge structure can guide the refrigerant flowing on the surface of the filter screen, so that the refrigerant forms a spiral flow path, vortex and energy loss caused by direct impact of the refrigerant on the surface of the filter screen are avoided, and the through-flow resistance is reduced. And the refrigerant is guided by the continuously extending spiral bulges, so that noise can be reduced. Further, in the conical filter screen with the spiral flow guiding function, in order to ensure the flow guiding effect, the increase of flow resistance caused by the steep angle is avoided, and the included angle between the spiral flow guiding structure and the central axis of the filter screen body is 20-25 degrees. Further, in the conical filter screen with the spiral flow guiding function, the cone tip cone angle of the conical flow guiding surface is 30-60 degrees. The range of the taper angle can obtain larger filt