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CN-224216244-U - Sealing test tool for electronic expansion valve

CN224216244UCN 224216244 UCN224216244 UCN 224216244UCN-224216244-U

Abstract

The utility model discloses an electronic expansion valve sealing test tool which is used for testing a cylindrical electronic expansion valve with a convex ring in the middle. The tool comprises a lower sealing seat and an upper sealing seat which are separated, wherein the lower sealing seat is fixed, and the upper sealing seat is driven by a thrust part to lift. The lower sealing seat is provided with a sample slot for fixing the electronic expansion valve, one side of the lower sealing seat is provided with a vent hole, the upper sealing seat comprises a hollow shell, a sealing sleeve with an elastic mechanism is arranged in the hollow shell, and the lower end of the sealing sleeve presses the convex ring of the electronic expansion valve. The upper and lower sealing seats have smooth contact surfaces and are provided with first sealing rings, the sample slot is in a step shape and is matched with a second sealing ring, and the upper sealing seat is also provided with a third sealing ring. The tool is reliable in sealing, high in adaptability and capable of protecting a tested piece and testing the tightness of the electronic expansion valve efficiently and accurately.

Inventors

  • SUN HOUTAO

Assignees

  • 中创华工智能科技(上海)有限公司

Dates

Publication Date
20260508
Application Date
20250630

Claims (8)

  1. 1. The electronic expansion valve sealing test tool is characterized by comprising a lower sealing seat and an upper sealing seat which are separated, wherein the lower sealing seat is fixed on a machine tool or a table top, the upper sealing seat is coaxially positioned right above the lower sealing seat and connected with a thrust component, and the thrust component drives the upper sealing seat to lift so as to be far away from or close to the lower sealing seat; The upper end face of the lower sealing seat is provided with a downward concave sample slot, the sample slot is used for fixing the electronic expansion valve, the inner contour of the sample slot is matched with the outer contour of the lower end of the electronic expansion valve, one side of the lower sealing seat is provided with a vent hole, the lower sealing seat is internally provided with a lower sampling channel, and the bottom of the lower sealing seat is provided with a vacuumizing sampling hole which is connected with the gas detector; The upper sealing seat comprises a hollow shell, a sealing sleeve is arranged in the hollow shell in a floating manner up and down, an elastic mechanism is connected between the top end of the sealing sleeve and the top wall inside the hollow shell, a blocking ring for limiting the downward sliding travel of the sealing sleeve is arranged on the lower end face of the upper sealing seat, the sealing sleeve is tightly pressed on the upper surface of a convex ring of an electronic expansion valve arranged in the lower sealing seat and applies downward pressure, an upper sampling channel connected with the cavity inside the hollow shell is arranged in the upper sealing seat, and the upper sampling channel is communicated with the lower sampling channel after the upper sealing seat and the lower sealing seat form sealing contact; The contact end surfaces of the upper sealing seat and the lower sealing seat are smooth planes without burrs, a first annular groove is formed in the contact end surface of the upper sealing seat and/or the contact end surface of the lower sealing seat, and a first sealing ring is arranged in the first annular groove.
  2. 2. The tool for testing the sealing of the electronic expansion valve according to claim 1, wherein the elastic mechanism is a spring.
  3. 3. The tool for testing the sealing of the electronic expansion valve according to claim 2, wherein the upper wall of the inner part of the hollow shell is provided with an upward concave spring groove, and the upper end of the spring is embedded and arranged in the spring groove.
  4. 4. The electronic expansion valve sealing test fixture according to claim 3, wherein an axial chute is arranged in the upper sealing seat, the sealing sleeve is arranged in the chute in a floating manner, and the outer wall of the sealing sleeve is in sliding fit with the chute; A circle of groove is arranged on the lower end surface of the upper sealing seat, a blocking ring which is flush with the lower end surface of the upper sealing seat and surrounds the outside of the chute is arranged in the groove through a screw, and the diameter of the inner ring of the blocking ring is smaller than that of the inner ring of the chute so as to form a limit step between the blocking ring and the bottom of the chute; the bottom of the sealing sleeve is provided with a positioning shaft shoulder matched with the limiting step, and the limiting step is matched with the positioning shaft shoulder to limit the maximum stroke of the downward sliding of the sealing sleeve.
  5. 5. The tool for testing the sealing of the electronic expansion valve according to claim 1, wherein the sample slot is a step-shaped groove matched with a convex ring and a lower shell of the convex ring of the electronic expansion valve, and a second sealing ring is arranged between the lower surface of the convex ring and the step-shaped groove of one stage.
  6. 6. The tool for testing the sealing of the electronic expansion valve according to claim 5, wherein the lower sealing seat is provided with a gasket groove positioned at the bottom of the sample slot, and a third sealing ring is arranged in the gasket groove.
  7. 7. The tool for testing the sealing of the electronic expansion valve according to claim 1, wherein the lower end face of the sealing sleeve is detachably provided with a rubber pressing cap for pressing on the upper surface of the convex ring.
  8. 8. The tool for testing the sealing of the electronic expansion valve according to claim 4, wherein a lubricating grease is arranged between the inner wall of the chute and the outer wall of the sealing sleeve.

Description

Sealing test tool for electronic expansion valve Technical Field The utility model relates to a sealing test of an electronic expansion valve, in particular to a sealing test tool of an electronic expansion valve. Background In refrigeration systems, electronic expansion valves are used as critical flow control components, and their tightness directly affects the operating efficiency and safety of the system. If the electronic expansion valve has the problem of poor sealing, the refrigerant leakage can be caused, the refrigeration effect is reduced, and the energy waste, the equipment damage and even the potential safety hazard can be caused. Therefore, before the electronic expansion valve leaves the factory, strict tightness test is carried out on the electronic expansion valve, and the electronic expansion valve is a key link for ensuring the quality of products. At present, the existing electronic expansion valve sealing test tool is often faced with the following problems in the use process: 1) The sealing reliability is insufficient, the design of the sealing structure of part of the tool is unreasonable, and even and stable pressure is difficult to form on the key sealing part of the electronic expansion valve, so that false leakage or sealing failure occurs in the testing process, and the accuracy of the testing result is affected. 2) And in the process of applying sealing pressure, if the pressure is controlled improperly or the contact part is designed unreasonably, the surface or structure of the electronic expansion valve can be scratched, deformed and other damages can be caused, and the qualification rate of the product can be influenced. 3) The sealing part is easy to be disturbed, namely, the insufficient sealing performance of the test tool can lead to the infiltration of external air or the leakage of internal test air, the test data are disturbed, and the actual sealing performance of the electronic expansion valve can not be accurately judged. In order to solve the above problems, it is necessary to design a tool which can stably and reliably perform a sealing test on an electronic expansion valve and has good compatibility and protection performance, so as to improve the testing efficiency and accuracy and ensure the delivery quality of the electronic expansion valve. Disclosure of utility model In order to solve the problems of the background technology, the utility model provides an electronic expansion valve sealing test tool, which adopts a multistage sealing structure to ensure air tightness and adopts a floating compaction mode to avoid damaging the electronic expansion valve. The specific scheme is as follows: The electronic expansion valve sealing test tool comprises a lower sealing seat and an upper sealing seat which are separated, wherein the lower sealing seat is fixed on a machine tool or a table top, and the upper sealing seat is coaxially positioned right above the lower sealing seat and connected with a thrust component, and the thrust component drives the upper sealing seat to be far away from or close to the lower sealing seat; The upper end face of the lower sealing seat is provided with a downward concave sample slot, the sample slot is used for fixing the electronic expansion valve, the inner contour of the sample slot is matched with the outer contour of the lower end of the electronic expansion valve, one side of the lower sealing seat is provided with a vent hole, the lower sealing seat is internally provided with a lower sampling channel, and the bottom of the lower sealing seat is provided with a vacuumizing sampling hole which is connected with the gas detector; The upper sealing seat comprises a hollow shell, a sealing sleeve is arranged in the hollow shell in a floating manner up and down, an elastic mechanism is connected between the top end of the sealing sleeve and the top wall inside the hollow shell, a blocking ring for limiting the downward sliding travel of the sealing sleeve is arranged on the lower end face of the upper sealing seat, the lower end face of the sealing sleeve is tightly pressed on the upper surface of a convex ring of an electronic expansion valve in the lower sealing seat and applies downward pressure, an upper sampling channel connected with the cavity inside the hollow shell is arranged in the upper sealing seat, and after the upper sealing seat and the lower sealing seat form sealing contact, the upper sampling channel is communicated with the lower sampling channel; The contact end surfaces of the upper sealing seat and the lower sealing seat are smooth planes without burrs, a first annular groove is formed in the contact end surface of the upper sealing seat and/or the contact end surface of the lower sealing seat, and a first sealing ring is arranged in the first annular groove. Further, the elastic mechanism is a spring. Further, the top wall inside the hollow shell is provided with an upward concave spring groove, and the upp