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JP-2026514342-A - Electronic expansion valve

JP2026514342AJP 2026514342 AJP2026514342 AJP 2026514342AJP-2026514342-A

Abstract

This application provides an electronic expansion valve comprising: a valve seat portion; a gasket provided within the valve seat portion and having a valve opening; and a spindle portion movably provided within the valve seat portion, wherein a sealing annular line used for sealing is provided between the spindle portion and the valve seat portion, the radius of the sealing annular line being R1; an upper chamber being provided on one side of the spindle portion that is separated from the gasket; a balancing passage being provided within the spindle portion, the balancing passage being connected to the valve opening and the upper chamber; and an annular sealing surface surrounding the valve opening being provided at the end of the spindle portion, the annular sealing surface being used for sealing engagement with the gasket, the inner diameter of the annular sealing surface being R2, and the outer diameter being R3, where R2 < R1 < R3 and R3 - R2 ≤ 0.1 mm. In this embodiment, the width of one side of the annular sealing surface is limited to within 0.1 mm, and after closing the valve port, it is ensured that the fluid pressures on both ends of the spindle portion are equal, thereby truly achieving internal equilibrium of the electronic expansion valve, reducing the influence of fluid pressure on the spindle portion, and improving valve opening performance. [Selection Diagram] Figure 1

Inventors

  • 趙 俊
  • 徐 冠軍
  • 賀 宇辰
  • 黄 鴻峰

Assignees

  • 浙江盾安人工環境股▲ふん▼有限公司

Dates

Publication Date
20260511
Application Date
20240801
Priority Date
20230809

Claims (12)

  1. Valve seat (10) and A gasket (20) provided within the valve seat portion (10) and having a valve opening (21), A spindle portion (30) is movably provided within the valve seat portion (10), wherein a sealing annular wire is provided between the spindle portion (30) and the valve seat portion (10) for sealing, the radius of the sealing annular wire is R1, and on one side of the spindle portion (30) that is separated from the gasket (20) is an upper chamber (11), and a balancing passage (31) is provided within the spindle portion (30), the balancing passage (31) includes the spindle portion (30) which connects the valve opening (21) and the upper chamber (11), The end of the spindle portion (30) has an annular sealing surface (321) surrounding the valve opening (21), and the annular sealing surface (321) is used to seal and engage with the gasket (20), the inner diameter of the annular sealing surface (321) is R2 and the outer diameter is R3. Here, an electronic expansion valve where R2 < R1 < R3 and R3 - R2 ≤ 0.1 mm.
  2. The electronic expansion valve according to claim 1, wherein 0.02 mm ≤ R3 - R2 ≤ 0.04 mm.
  3. The electronic expansion valve according to claim 1, wherein 0.1 mm² < R1*(R3-R2) < 1.8 mm² .
  4. The electronic expansion valve according to claim 1, wherein the annular sealing surface (321) is a flat or arcuate surface, and the surface on which the gasket (20) and the annular sealing surface (321) engage is flat.
  5. The electronic expansion valve according to claim 1, wherein the end of the spindle portion (30) has an inner tapered surface (322), the inner edge of the inner tapered surface (322) and the inner edge of the annular sealing surface (321) overlap, and the inner tapered surface (322) is located on one side of the annular sealing surface (321) that is separated from the gasket (20).
  6. The electronic expansion valve according to claim 5, wherein the angle between the inner tapered surface (322) and the valve port (21) in the radial direction is A, and 5° ≤ A ≤ 40°.
  7. The electronic expansion valve according to claim 1, wherein the end of the spindle portion (30) has an outer tapered surface (323), the inner edge of the outer tapered surface (323) and the outer edge of the annular sealing surface (321) overlap, and the outer tapered surface (323) is located on one side of the annular sealing surface (321) that is separated from the gasket (20).
  8. The electronic expansion valve according to claim 7, wherein the angle between the outer tapered surface (323) and the valve port (21) in the radial direction is B, and 15° ≤ B ≤ 45°.
  9. The valve seat portion (10) includes a valve seat body (12) and a guide sleeve, the gasket (20) is fixed inside the valve seat body (12), and the electronic expansion valve further includes a sealing ring (40), where, The outer wall of the spindle portion (30) has a sealing groove, the sealing ring (40) is located within the sealing groove, and the sealing annular line is formed at the position where the outer wall of the sealing ring (40) and the inner wall of the guide sleeve come into contact, or, The electronic expansion valve according to claim 1, wherein the inner wall of the guide sleeve has a sealing groove, the sealing ring (40) is located within the sealing groove, and the sealing annular line is formed at a position where the inner wall of the sealing ring (40) and the outer wall of the spindle portion (30) come into contact.
  10. The end of the spindle portion (30) has a first tapered surface (324) and a second tapered surface (325) provided in order, the first tapered surface (324) being located inside the annular sealing surface (321), the second tapered surface (325) being located inside the first tapered surface (324), the tapered angles of the first tapered surface (324) and the second tapered surface (325) being different, and when the valve opening (21) is closed, the second tapered surface (325) being located inside the valve opening (21), and a portion of the first tapered surface (324) being located inside the valve opening (21), as described in claim 1.
  11. The electronic expansion valve according to claim 1, wherein the gasket (20) is made of an elastic material, the gasket (20) is located in a groove of the valve seat (10), the valve seat (10) has a limiting ring (14), the limiting ring (14) is crimped to the end face of the gasket (20), and the inner wall of the valve port (21) has a tapered surface for adjusting the flow rate.
  12. The spindle portion (30) includes a valve head (32), a screw (33), a bearing (34), a bush (35), and an elastic member (36), wherein the valve head (32) has the annular sealing surface (321), one end of the screw (33) is inserted into the chamber of the valve head (32), the bearing (34) is located between the screw (33) and the inner wall of the valve head (32), and the bearing (34), the bush (35), the elastic member (3 6) and the bottom wall of the valve head (32) are in sequential contact, wherein the valve head (32) has a first passage, the bush (35) has a second passage, and the screw (33) has a third passage; the valve port (21), the first passage, the second passage, the third passage, and the upper chamber (11) are in sequential communication, and the first passage, the second passage, and the third passage constitute the balancing passage (31), as described in claim 1.

Description

This application claims priority to the patent application filed with the China National Intellectual Property Administration on August 9, 2023, with application number 202322142786.8, and the title of the invention being "Electronic Expansion Valve." This application relates to the technical field of electronic expansion valves, and more specifically, to electronic expansion valves. In electronic expansion valves, to minimize the influence of fluid pressure on the opening and closing of the valve port, some embodiments provide an equilibrium passage inside the spindle. This equilibrium passage connects the valve port to a chamber on one side of the spindle away from the valve port, thereby equalizing the fluid pressure at both ends of the spindle. The fluid pressure at the spindle is determined by the area of fluid bias at both ends. To reduce the pressure difference at both ends of the spindle, it is necessary to make the area of fluid bias at both ends of the spindle as similar as possible. In conventional electronic expansion valves, the large size of the sealing surface for sealing the valve opening of the spindle results in a larger actual sealing area relative to the valve opening's sealing position. This makes it difficult to confirm the force-bearing area at one end of the spindle facing the valve opening after valve closure, leading to a larger differential pressure at both ends of the spindle. This affects the pressure balance at both ends of the spindle and consequently impacts the valve opening performance. This application provides an electronic expansion valve that solves the problem in the prior art where the large sealing area of the spindle portion within the electronic expansion valve makes it difficult to achieve pressure balance, which affects the valve opening performance. To solve the above-mentioned problems, this application provides an electronic expansion valve comprising: a valve seat; a gasket provided within the valve seat and having a valve opening; and a spindle portion movably provided within the valve seat, wherein a sealing annular line used for sealing is provided between the spindle portion and the valve seat, the radius of the sealing annular line being R1; an upper chamber being provided on one side of the spindle portion that is separated from the gasket; a balancing passage being provided within the spindle portion, the balancing passage connecting the valve opening and the upper chamber; and an annular sealing surface surrounding the valve opening at the end of the spindle portion, the annular sealing surface being used for sealing engagement with the gasket, the inner diameter of the annular sealing surface being R2, and the outer diameter being R3, where R2 < R1 < R3 and R3 - R2 ≤ 0.1 mm. Furthermore, 0.02 mm ≤ R3 - R2 ≤ 0.04 mm. Furthermore, 0.1 mm² < R1*(R3-R2) < 1.8 mm² . Furthermore, the annular sealing surface is either a flat or arcuate surface, and the surface on which the gasket engages with the annular sealing surface is flat. Furthermore, the end of the spindle portion has an inner tapered surface, the inner edge of the inner tapered surface and the inner edge of the annular sealing surface overlap, and the inner tapered surface is located on one side of the annular sealing surface that is separated from the gasket. Furthermore, the angle between the inner tapered surface and the radial direction of the valve opening is A, where 5° ≤ A ≤ 40°. Furthermore, the end of the spindle portion has an outer tapered surface, the inner edge of the outer tapered surface and the outer edge of the annular sealing surface overlap, and the outer tapered surface is located on one side of the annular sealing surface that is separated from the gasket. Furthermore, the angle between the outer tapered surface and the valve opening in the radial direction is B, where 15° ≤ B ≤ 45°. Furthermore, the valve seat portion includes a valve seat body and a guide sleeve, and the gasket is fixed within the valve seat body. The electronic expansion valve further includes a sealing ring, where the outer wall of the spindle portion has a sealing groove, the sealing ring is located within the sealing groove, and a sealing annular line is formed at the position where the outer wall of the sealing ring and the inner wall of the guide sleeve come into contact, or the inner wall of the guide sleeve has a sealing groove, the sealing ring is located within the sealing groove, and a sealing annular line is formed at the position where the inner wall of the sealing ring and the outer wall of the spindle portion come into contact. Furthermore, the end of the spindle portion has a first tapered surface and a second tapered surface, arranged in sequence. The first tapered surface is located inside the annular sealing surface, and the second tapered surface is located inside the first tapered surface. The taper angles of the first and second tapered surfaces are different. When the valve opening is c