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JP-7857425-B2 - Electronic expansion valve

JP7857425B2JP 7857425 B2JP7857425 B2JP 7857425B2JP-7857425-B2

Inventors

  • ▲デン▼ 岳忠
  • 王 傅鋼

Assignees

  • 浙江盾安人工環境股▲ふん▼有限公司

Dates

Publication Date
20260512
Application Date
20230306
Priority Date
20220616

Claims (9)

  1. The assembly includes a valve seat assembly (10), a soft gasket (20), a spindle (30), and a drive assembly (40), The valve seat assembly (10) includes a valve seat (11) and a valve core seat (12) connected to each other, the valve core seat (12) having a flow hole (121), The soft gasket (20) is located at one end of the valve core seat (12) facing the valve seat (11), and both the valve seat (11) and the valve core seat (12) are restrictedly engaged with the soft gasket (20), and the soft gasket (20) has a valve opening (21) that communicates with the flow hole (121). The spindle (30) is provided within the valve seat (11) so as to be movable in the axial direction to open and close the valve port (21), and when the spindle (30) closes the valve port (21), the spindle (30) comes into contact with the soft gasket (20), and there is a gap between the spindle (30) and the inner wall of the valve core seat (12). The drive assembly (40) includes a screw (41) and a transition structure (42), the screw (41) is connected to the spindle (30) via the transition structure (42), the screw (41) is rotatable relative to the spindle (30), and the screw (41) drives the spindle (30) to move axially without rotating it when moving axially . The transition structure (42) includes a rotating member (421), a guide sleeve (422), and an elastic member (423), wherein the inner ring of the rotating member (421) is connected to the screw (41), the outer ring of the rotating member (421) is clearance-fitted to the inner wall of the guide sleeve (422), one end of the spindle (30) away from the valve port (21) is restrictedly engaged with the guide sleeve (422), the elastic member (423) is located within the guide sleeve (422), and the elastic member (423) is located between the rotating member (421) and the spindle (30) , in an electronic expansion valve.
  2. The electronic expansion valve according to claim 1, wherein when the spindle (30) closes the valve opening (21), a portion of the spindle (30) penetrates into the valve opening (21), and the outer wall of the spindle (30) abuts against the inner wall of the valve opening (21).
  3. The electronic expansion valve according to claim 2, wherein the inner wall of the valve port (21) is in the shape of a straight cylinder or a tapered cylinder.
  4. The spindle (30) includes, in order, a main body segment (31), a first tapered segment (32), and a second tapered segment (33), wherein the taper angle of the first tapered segment (32) is greater than that of the second tapered segment (33), and when the spindle (30) closes the valve opening (21), the outer wall of the first tapered segment (32) abuts against the inner wall of the valve opening (21), and the second tapered segment (33) penetrates into the flow hole (121), as described in claim 2.
  5. The valve core seat (12) has a mounting groove at one end facing the valve seat (11), and the soft gasket (20) is located within the mounting groove, Alternatively, the electronic expansion valve according to claim 1, wherein one end of the valve seat (11) facing the valve core seat (12) has a mounting groove, and the soft gasket (20) is located within the mounting groove.
  6. The electronic expansion valve according to claim 1, wherein the inner wall of the valve seat (11) has a positioning step (111), a portion of the valve core seat (12) penetrates into the positioning step (111), and the stepped surface of the positioning step (111) abuts against the side of the soft gasket (20) away from the valve core seat (12).
  7. The electronic expansion valve according to claim 6, wherein the valve core seat (12) includes a first annular cylinder (122), a second annular cylinder (123), and a third annular cylinder (124) connected in order, the diameters of the first annular cylinder (122), the second annular cylinder (123), and the third annular cylinder (124) increasing in order, the soft gasket (20) is located within the first annular cylinder (122), the first annular cylinder (122) penetrates into the positioning step (111), and the end face of the second annular cylinder (123) abuts against the end face of the valve seat (11).
  8. The electronic expansion valve according to claim 1, wherein the transition structure (42) further includes a bush (424) and a limiting sleeve (425), the bush (424) being located within the guide sleeve (422) and in contact with the outer ring of the rotating member (421), the elastic member (423) being fitted into the bush (424), the limiting sleeve (425) being fixedly connected to one end of the guide sleeve (422) facing the valve port (21), the spindle (30) passing through the limiting sleeve (425), the spindle (30) having a limiting ring (34), and both sides of the limiting ring (34) in contact with the elastic member (423) and the limiting sleeve ( 425 ), respectively.
  9. The electronic expansion valve according to claim 1, wherein the side wall of the valve seat (11) has a flow hole (112), the valve port (21) communicates with the flow hole (112) when opened, the electronic expansion valve further includes a connecting seat (50), a valve pipe (60), and a drive unit (70), both of which are connected to the connecting seat (50), the flow hole (112) and the valve core seat (12) are both located on the side of the connecting seat (50) away from the valve pipe (60), the drive unit (70) is provided within the valve pipe (60), and the drive unit (70) drives the screw (41) to move.

Description

This application claims priority to the patent application filed with the China National Intellectual Property Administration on June 16, 2022, with application number 202221510246.X, 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. Currently, various cooling and heating devices such as air conditioners, refrigerators, and heat pump water heaters typically use electronic expansion valves to regulate fluid flow. Electronic expansion valves usually consist of a valve seat assembly, spindle, and drive assembly, and control flow by adjusting the valve opening through the movement of the spindle. Conventional electronic expansion valves typically prevent internal leakage using a wire seal engagement between a metal spindle and a metal valve core. However, factors such as machining accuracy of the parts and surface roughness of the metal can lead to a high failure rate due to internal leakage, which reduces the sealing effect of the valve opening and makes fluid leakage more likely. Application Summary This application provides an electronic expansion valve that solves the problem of low sealing effectiveness in conventional electronic expansion valves. To solve the above problems, this application provides an electronic expansion valve comprising a valve seat assembly, a soft gasket, a spindle, and a drive assembly, wherein the valve seat assembly includes a valve seat and a valve core seat connected to each other, the valve core seat having a flow hole, the soft gasket is located at one end of the valve core seat facing the valve seat, both the valve seat and the valve core seat are restrictedly engaged with the soft gasket, the soft gasket has a valve opening communicating with the flow hole, the spindle is provided within the valve seat so as to be axially movable to open and close the valve opening, and when the spindle closes the valve opening, the spindle abuts against the soft gasket and there is a gap between the spindle and the inner wall of the valve core seat, and the drive assembly includes a screw and a transition structure, the screw is connected to the spindle via the transition structure, the screw is rotatable relative to the spindle, and when the screw moves axially, it drives the spindle to move axially, thereby providing an electronic expansion valve. Furthermore, when the spindle closes the valve opening, a portion of the spindle penetrates into the valve opening, and the outer wall of the spindle abuts against the inner wall of the valve opening. Furthermore, the inner wall of the valve opening is either straight or tapered. Furthermore, the spindle includes a body segment, a first tapered segment, and a second tapered segment connected in sequence. The taper angle of the first tapered segment is greater than that of the second tapered segment. When the spindle closes the valve opening, the outer wall of the first tapered segment abuts against the inner wall of the valve opening, and the second tapered segment penetrates into the flow hole. Furthermore, one end of the valve core seat facing the valve seat has a mounting groove, and the soft gasket is positioned within the mounting groove, or, one end of the valve seat facing the valve core seat has a mounting groove, and the soft gasket is positioned within the mounting groove. Furthermore, the inner wall of the valve seat has a positioning step, a portion of the valve core seat penetrates into the positioning step, and the stepped surface of the positioning step abuts against the side of the soft gasket away from the valve core seat. Furthermore, the valve core seat includes a first annular cylinder, a second annular cylinder, and a third annular cylinder connected in sequence, with the diameters of the first, second, and third annular cylinders increasing in order. The soft gasket is located within the first annular cylinder, the first annular cylinder penetrates into a positioning step, and the end face of the second annular cylinder abuts against the end face of the valve seat. Furthermore, the transition structure includes a rotating member, a guide sleeve, and an elastic member. The inner ring of the rotating member is connected to a screw, the outer ring of the rotating member is connected to the inner wall of the guide sleeve, one end of the spindle away from the valve port is restrictedly engaged with the guide sleeve, and the elastic member is located within the guide sleeve and between the rotating member and the spindle. Furthermore, the transition structure further includes a bush and a limiting sleeve. The bush is located within the guide sleeve and abuts against the outer ring of the rotating member. The elastic member is fitted into the bush. The limiting sleeve is fixedly connected to one end of the guide sleeve facing the valve opening. The spindle passes through the limit