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CN-116733922-B - Electronic expansion valve

CN116733922BCN 116733922 BCN116733922 BCN 116733922BCN-116733922-B

Abstract

The invention provides an electronic expansion valve which comprises a nut assembly, a valve seat, a guide sleeve and a guide sleeve, wherein the nut assembly comprises a nut and a connecting plate sleeved on the nut, the connecting plate is in clearance fit with the nut in the radial direction, the outer side wall of the connecting plate is fixedly connected with the valve seat, the connecting plate is in clearance fit with the valve seat in the axial direction of the nut, the guide sleeve is fixedly arranged in a cavity of the valve seat, the guide sleeve is spliced with the nut, and the guide sleeve is in butt joint with the nut in the axial direction and in interference fit in the radial direction. By adopting the scheme, the coaxiality of the guide sleeve and the nut is ensured by limiting the relative movement between the guide sleeve and the nut in the axial direction and the radial direction, further, under the condition that the coaxiality of the nut and the guide sleeve is determined, enough adjusting gaps are reserved among the connecting plates, the nuts and between the connecting plates and the valve seat, the influence on the coaxiality between the nut and the guide sleeve caused by over-positioning of the connecting plates in the installation process is prevented, the coaxiality of the nut assembly is improved, and the performance of the electronic expansion valve is ensured.

Inventors

  • ZHAN SHAOJUN
  • HE YUCHEN

Assignees

  • 浙江盾安禾田金属有限公司

Dates

Publication Date
20260505
Application Date
20220304

Claims (13)

  1. 1. An electronic expansion valve, comprising: The nut assembly (10), the nut assembly (10) comprises a nut (11) and a connecting plate (12) sleeved on the nut (11), and the connecting plate (12) and the nut (11) are in clearance fit in the radial direction; the outer side wall of the connecting plate (12) is fixedly connected with the valve seat (20), and the connecting plate (12) and the valve seat (20) are in clearance fit in the axial direction of the nut (11); the guide sleeve (30) is fixedly arranged in the cavity of the valve seat (20), the guide sleeve (30) is inserted into the nut (11), and the guide sleeve (30) and the nut (11) are in axial butt joint and in radial interference fit.
  2. 2. The electronic expansion valve of claim 1, wherein, The nut (11) is provided with a positioning hole (111), a stop surface (112) is arranged in the positioning hole (111), one end of the guide sleeve (30) penetrates into the positioning hole (111), the end surface of the guide sleeve (30) is abutted against the stop surface (112), and the outer wall of the guide sleeve (30) is in interference fit with the inner wall of the positioning hole (111); Or the guide sleeve (30) is provided with a positioning hole (111), a stop surface (112) is arranged in the positioning hole (111), one end of the nut (11) penetrates into the positioning hole (111), the end surface of the nut (11) is abutted to the stop surface (112), and the outer wall of the nut (11) is in interference fit with the inner wall of the positioning hole (111).
  3. 3. The electronic expansion valve according to claim 1, further comprising a positioning boss (41) provided in the valve seat (20), the positioning boss (41) and an end of the guide sleeve (30) remote from the nut (11) being inserted, the positioning boss (41) and the guide sleeve (30) abutting in an axial direction and being interference fit in a radial direction.
  4. 4. The electronic expansion valve according to claim 3, wherein the positioning boss (41) and the valve seat (20) are of an integrated structure, or the electronic expansion valve comprises a valve port piece (40), the valve port piece (40) comprises the positioning boss (41) and a body (42) connected with the positioning boss (41), the valve port piece (40) is further provided with a valve port penetrating through the body (42) and the positioning boss (41), the body (42) is fixedly connected with the valve seat (20), the positioning boss (41) penetrates into one end, far away from the nut (11), of the guide sleeve (30), the positioning boss (41) is in interference fit with the guide sleeve (30), and the guide sleeve (30) is abutted against the body (42).
  5. 5. The electronic expansion valve according to claim 4, wherein the body (42) comprises a first shaft section (421), a second shaft section (422) and a third shaft section (423) which are sequentially connected, the outer diameters of the first shaft section (421), the second shaft section (422) and the third shaft section (423) are sequentially reduced, the first shaft section (421) and the positioning boss (41) are connected, the valve seat (20) is provided with a first matching hole and a second matching hole which are communicated with each other, the diameter of the first matching hole is larger than the diameter of the second matching hole, the first shaft section (421) penetrates into the first matching hole, the second shaft section (422) penetrates through the second matching hole, and the third shaft section (423) is located outside the valve seat (20).
  6. 6. The electronic expansion valve according to claim 1, wherein the nut (11) comprises a nut body (113) and a first limiting structure (114) arranged on the nut body (113), the connecting plate (12) comprises a connecting ring (121) and a second limiting structure (122) arranged on the connecting ring (121), wherein the connecting ring (121) is sleeved on the nut body (113), the connecting ring (121) and the nut body (113) are in clearance fit, the first limiting structure (114) and the second limiting structure (122) are in clearance fit in the radial direction of the connecting ring (121), and the first limiting structure (114) and the second limiting structure (122) are in interference fit in the circumferential direction of the connecting ring (121).
  7. 7. The electronic expansion valve of claim 6, wherein the first limiting structure (114) is a limiting boss disposed on an outer wall of the nut body (113), the second limiting structure (122) is a limiting groove disposed on an inner wall of the connecting plate (12), the limiting boss has two first limiting surfaces (1141) and a first mating surface (1142) disposed between the two first limiting surfaces (1141), the limiting groove has two second limiting surfaces (1221) and a second mating surface (1222) disposed between the two second limiting surfaces (1221), the first mating surfaces (1142) and the second mating surfaces (1222) are in clearance fit, and the two first limiting surfaces (1141) and the two second limiting surfaces (1221) are in one-to-one corresponding limiting fit.
  8. 8. The electronic expansion valve according to claim 7, wherein the nut body (113) comprises a nut section (1131), a transition section (1132), a connecting section (1133) and a limiting plate (1134) which are sequentially connected, the outer diameter of the connecting section (1133) is larger than that of the nut section (1131), the outer diameter of the limiting plate (1134) is larger than that of the connecting section (1133), the connecting section (1133) is detachably sleeved with the connecting plate (12), the connecting plate (12) is abutted with the limiting plate (1134), and the first limiting structure (114) is located on the outer wall of the connecting section (1133).
  9. 9. Electronic expansion valve according to claim 1, characterized in that the inner side wall of the valve seat (20) has a first stepped surface (21) parallel to the axis of the nut (11) and a second stepped surface (22) perpendicular to the axis of the nut (11), the first stepped surface (21) and the second stepped surface (22) forming a stepped structure, the outer side wall of the connecting plate (12) being connected to the first stepped surface (21), the connecting plate (12) and the second stepped surface (22) being in a clearance fit.
  10. 10. Electronic expansion valve according to claim 9, wherein a part of the connection plate (12) is located inside the step structure and another part of the connection plate (12) is located outside the step structure, the connection plate (12) and the valve seat (20) being welded.
  11. 11. The electronic expansion valve according to claim 10, further comprising a valve cover (50) and a rotor assembly (60), wherein the valve cover (50) and the valve seat (20) are connected, the rotor assembly (60) is arranged in the valve cover (50), the rotor assembly (60) comprises a magnetic rotor (61) and a rotating connecting piece (62) arranged in the magnetic rotor (61), the rotating connecting piece (62) comprises a rotor connecting plate (621) and a guide rod (622) which are connected with each other, the rotor connecting plate (621) is fixedly connected with the magnetic rotor (61), the guide rod (622) extends along the axial direction of the nut (11), and the nut assembly (10) further comprises a stop ring rotatably arranged on the nut (11), and the side wall of the guide rod (622) is in limit fit with the stop ring.
  12. 12. The electronic expansion valve according to claim 11, wherein the rotary connecting piece (62) is of an integral structure, or the rotor connecting plate (621) and the guide rod (622) are of two independent structures, and the guide rod (622) is in clearance fit with the inner wall of the magnetic rotor (61), or the guide rod (622) is attached to the inner wall of the magnetic rotor (61).
  13. 13. The electronic expansion valve of claim 11, wherein the rotor assembly (60) further comprises a stop (63), the rotor connecting plate (621) has a press-fit groove (623), the stop (63) is disposed in the press-fit groove (623), a portion of the nut (11) is disposed in the magnetic rotor (61), the electronic expansion valve further comprises a valve needle assembly (70), a screw of the valve needle assembly (70) and the stop (63) are welded, and the screw and the nut (11) are threadedly connected.

Description

Electronic expansion valve Technical Field The invention relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve. Background In the installation process of the electronic expansion valve in the prior art, the installation precision among the nut component, the valve seat and the guide sleeve cannot be guaranteed, so that the coaxiality among the nut component, the valve seat and the guide sleeve is reduced. Meanwhile, the electronic expansion valve in the prior art is easy to have the over-positioning or inaccurate positioning of the nut or the connecting plate in the installation process, and the installation accuracy of the electronic expansion valve is affected. Disclosure of Invention The invention provides an electronic expansion valve, which is used for improving the installation precision of the electronic expansion valve in the prior art. In order to solve the problems, the invention provides an electronic expansion valve which comprises a nut assembly, a valve seat, a guide sleeve and a guide sleeve, wherein the nut assembly comprises a nut and a connecting plate sleeved on the nut, the connecting plate is in clearance fit with the nut in the radial direction, the outer side wall of the connecting plate is fixedly connected with the valve seat, the connecting plate is in clearance fit with the valve seat in the axial direction of the nut, the guide sleeve is fixedly arranged in a cavity of the valve seat, the guide sleeve is spliced with the nut, and the guide sleeve is in butt joint with the nut in the axial direction and in interference fit in the radial direction. Further, the nut is provided with a positioning hole, a stop surface is arranged in the positioning hole, one end of the guide sleeve penetrates into the positioning hole, the end face of the guide sleeve is abutted against the stop surface, the outer wall of the guide sleeve is in interference fit with the inner wall of the positioning hole, or the guide sleeve is provided with the positioning hole, the stop surface is arranged in the positioning hole, one end of the nut penetrates into the positioning hole, the end face of the nut is abutted against the stop surface, and the outer wall of the nut is in interference fit with the inner wall of the positioning hole. Further, the electronic expansion valve further comprises a positioning boss arranged in the valve seat, one end, far away from the nut, of the positioning boss and the guide sleeve is inserted, and the positioning boss and the guide sleeve are in axial butt joint and in radial interference fit. Further, the positioning boss and the valve seat are of an integrated structure, or the electronic expansion valve comprises a valve port piece, the valve port piece comprises a positioning boss and a body connected with the positioning boss, the valve port piece is further provided with a valve port penetrating through the body and the positioning boss, the body is fixedly connected with the valve seat, the positioning boss penetrates into one end, far away from the nut, of the guide sleeve, the positioning boss is in interference fit with the guide sleeve, and the guide sleeve is abutted against the body. Further, the body comprises a first shaft section, a second shaft section and a third shaft section which are sequentially connected, the outer diameters of the first shaft section, the second shaft section and the third shaft section are sequentially reduced, the first shaft section is connected with the positioning boss, the valve seat is provided with a first matching hole and a second matching hole which are mutually communicated, the diameter of the first matching hole is larger than that of the second matching hole, the first shaft section penetrates into the first matching hole, the second shaft section penetrates through the second matching hole, and the third shaft section is located outside the valve seat. Further, the nut comprises a nut main body and a first limiting structure arranged on the nut main body, the connecting plate comprises a connecting ring and a second limiting structure arranged on the connecting ring, the connecting ring is sleeved on the nut main body, the connecting ring is in clearance fit with the nut main body, the first limiting structure and the second limiting structure are in clearance fit with each other in the radial direction of the connecting ring, and the first limiting structure and the second limiting structure are in interference fit with each other in the circumferential direction of the connecting ring. Further, the first limiting structure is a limiting boss arranged on the outer wall of the nut main body, the second limiting structure is a limiting groove arranged on the inner wall of the connecting plate, the limiting boss is provided with two first limiting surfaces and a first matching surface positioned between the two first limiting surfaces, the limiting groove is provide