Expansion valve zeroing structure

Abstract

The utility model relates to the technical field of valve body detection, relate to a kind of expansion valve zero setting structure.The utility model is compressed by material assembly and is driven to be compressed in detection fixture by material plate valve body, and air path component is filled to the detection fixture and is discharged to carry out airtight detection to valve body, and rotating component is rotated to the valve body held by clamping part and is opened and closed, and fluid is introduced into valve body to carry out airtight detection to the opening and closing of valve body, improve detection efficiency, material assembly can avoid the position deviation of valve body, positioning is reliable, not prone to moving, ensure air pressure detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of valve body testing technology, and specifically to a zero-adjustment structure for an expansion valve. Background Technology

[0002] The expansion valve is a crucial component in a refrigeration system, typically installed between the liquid receiver and the evaporator. Over time, the valve body will inevitably wear down, leading to a decrease in airtightness. Airtightness testing plays an increasingly important role in ensuring product quality. During the manufacturing process, the position of the valve needle is uncertain. Therefore, the valve body needs to undergo a zero-adjustment test before leaving the factory. This test adjusts the valve needle to the zero position, ensuring a completely closed state. The zero-adjustment test is performed manually or using a handheld device to seal the valve body. While these methods can seal the valve body, the positioning effect is poor, and valve body displacement is prone to occur, affecting the proper execution of the zero-position test. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an expansion valve zeroing structure that improves detection efficiency, avoids valve body position deviation, ensures reliable positioning, and prevents movement.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An expansion valve zero-adjustment structure includes:

[0006] The machine is equipped with a testing station, and the testing station is equipped with a testing fixture that matches the valve body;

[0007] A switch assembly is disposed above the detection fixture. The switch assembly includes a clamping component and a rotating component. The rotating component is used to rotate the valve body clamped by the clamping component to open and close the valve body.

[0008] A pressing assembly is provided on the machine base. The pressing assembly is provided with a pressing plate and a pressing hole that matches the valve body. The switching assembly is disposed opposite to the pressing hole. The pressing assembly is used to drive the pressing plate to press the valve body held by the clamping component onto the testing fixture.

[0009] An air circuit assembly is connected to the testing fixture, and the air circuit assembly is used to pressurize and depress the testing fixture to perform airtightness testing on the valve body.

[0010] In one embodiment of this utility model, the pressing assembly includes a pressing frame, which is disposed on the machine base. A pressing cylinder is disposed on the pressing frame and is drivenly connected to the pressing bracket. A pressing plate is disposed at the bottom of the pressing bracket, and a switching assembly is disposed on the pressing bracket. The pressing cylinder drives the pressing plate to press the valve body onto the detection fixture so that the clamping component can clamp the valve stem on the valve body.

[0011] In one embodiment of the present invention, the clamping component includes a rotating jaw, a clamping block is provided on the clamping arm of the rotating jaw, a clamping groove is provided on the clamping block, the clamping grooves on the plurality of clamping blocks form a limiting hole that matches the valve stem, a protrusion is provided on the clamping block, and a groove that matches the protrusion is provided on the clamping arm.

[0012] In one embodiment of this utility model, the rotating component includes a rotating motor, which is mounted on a pressure support and driven by a rotating table. The clamping component is mounted on the base plate of the rotating table, and the rotating motor drives the base plate on the rotating table to rotate and open / close the valve body clamped by the clamping component.

[0013] In one embodiment of this utility model, a detection plate is provided on the clamping component, and a detection sensor matching the detection plate is provided on the pressure bracket.

[0014] In one embodiment of this utility model, the detection fixture includes a body, on which a chamber matching the valve body is formed, and a sealing step matching the valve body is provided on the chamber. A sealing ring is provided between the sealing step and the valve body. An air inlet and an air outlet are provided on the chamber, and the air passage assembly is connected to the air inlet and the air outlet.

[0015] In one embodiment of this utility model, a first plate is provided on the testing station, a first waist-shaped groove is provided on the first plate, a second plate is provided on the first plate, a second waist-shaped groove is provided on the second plate, the first waist-shaped groove is perpendicular to the length direction of the first waist-shaped groove, a first bolt is provided on the first waist-shaped groove, the first plate is connected to the machine base by the first bolt, a second bolt is provided on the second waist-shaped groove, the second plate is connected to the first plate by the second bolt, and the testing fixture is provided on the second plate.

[0016] In one embodiment of this utility model, the gas path assembly includes an inlet pipe and an outlet pipe. The inlet pipe is connected to an inlet hole on the testing fixture, and the outlet pipe is connected to the outlet hole. A flow meter is installed on the outlet pipe. The free end of the inlet pipe is connected to a pressure reducing valve. A pressure gauge is installed on the inlet pipe. The pressure reducing valve is connected to a gas storage tank through a pipeline.

[0017] In one embodiment of this utility model, a control valve is provided on the intake pipe, the control valve is connected to the exhaust pipe, and a muffler is provided on both the exhaust pipe and the outlet pipe.

[0018] In one embodiment of this utility model, the pressure hole is provided with a countersunk hole that matches the valve body. The depth of the countersunk hole is less than the height of the boss on the valve body, and the countersunk hole is provided with an anti-slip layer.

[0019] The beneficial effects of this utility model are:

[0020] This invention uses a pressing assembly to drive the pressing plate valve body to press against the testing fixture. The air circuit assembly presses and releases air on the testing fixture to perform airtightness testing on the valve body. The rotating component rotates the valve body held by the clamping component to open and close. Fluid is introduced into the valve body to perform airtightness testing on the opening and closing of the valve body, thereby improving testing efficiency. The pressing assembly can prevent the valve body from shifting position, ensuring reliable positioning and preventing movement, thus guaranteeing the accuracy of air pressure testing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an expansion valve zeroing structure according to this utility model.

[0022] Figure 2 This is a schematic diagram of the pressing component of this utility model.

[0023] Figure 3 This is a schematic diagram of the testing fixture of this utility model.

[0024] The following are the labeling instructions in the diagram: 1. Machine base; 2. Air circuit assembly; 21. Exhaust pipe; 22. Air outlet pipe; 23. Flow meter; 24. Control valve; 25. Pressure reducing valve; 26. Pressure gauge; 27. Piping; 28. Air storage tank; 3. Testing fixture; 31. Body; 32. Chamber; 33. Sealing step; 34. Air inlet; 35. Air outlet; 4. Material pressing assembly; 41. Material pressing frame; 42. Material pressing cylinder; 43. 44. Material clamping bracket; 45. Material clamping plate; 56. Countersunk hole; 57. Clamping component; 51. Rotating jaw; 52. Clamping arm; 53. Clamping block; 54. Clamping groove; 55. Protrusion; 6. Rotating component; 61. Rotary motor; 62. Rotary table; 7. Valve body; 71. First plate; 72. First waist-shaped groove; 73. Second plate; 74. Second waist-shaped groove; 75. Detection plate; 76. Detection sensor; 77. Valve stem. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0026] Reference Figure 1-3 As shown, an expansion valve zero-adjustment structure includes:

[0027] Machine 1, which is equipped with a testing station, and the testing station is equipped with a testing fixture 3 that matches the valve body 7;

[0028] A switch assembly is disposed above the detection fixture 3. The switch assembly includes a clamping component 5 and a rotating component 6. The rotating component 6 is used to rotate the valve body 7 clamped by the clamping component 5 to open and close.

[0029] The pressing assembly 4 is disposed on the machine base 1. The pressing assembly 4 is provided with a pressing plate 44. The pressing plate 44 is provided with a pressing hole that matches the valve body 7. The switching assembly is disposed opposite to the pressing hole. The pressing assembly 4 is used to drive the pressing plate 44 to press the valve body 7 held by the clamping component 5 onto the detection fixture 3.

[0030] The air circuit assembly 2 is connected to the testing fixture 3. The air circuit assembly 2 is used to charge and release air on the testing fixture 3 to perform airtightness testing on the valve body 7.

[0031] This invention uses a pressing assembly 4 to drive a pressing plate 44 to press the valve body 7 onto a testing fixture 3. An air circuit assembly 2 presses and releases air onto the testing fixture 3 to perform an airtightness test on the valve body 7. A rotating component 6 rotates the valve body 7 held by a clamping component 5 to open and close the valve body 7. Fluid is introduced into the valve body 7 to perform an airtightness test on the opening and closing of the valve body 7, thereby improving testing efficiency. The pressing assembly 4 can prevent the valve body 7 from shifting position, ensuring reliable positioning and preventing movement, thus guaranteeing the accuracy of air pressure testing.

[0032] In one embodiment of this utility model, the pressing assembly 4 includes a pressing frame 41, which is disposed on the machine base 1. A pressing cylinder 42 is disposed on the pressing frame 41. The pressing cylinder 42 is drivenly connected to the pressing bracket 43. A pressing plate 44 is disposed at the bottom of the pressing bracket 43. A switch assembly is disposed on the pressing bracket 43. The pressing cylinder 42 drives the pressing plate 44 to press the valve body 7 onto the detection fixture 3 so that the clamping component 5 can clamp the valve stem 77 on the valve body 7.

[0033] Specifically, the pressure cylinder 42 drives the pressure plate 44 on the pressure bracket 43 to move toward the testing fixture 3, so that the valve body 7 passes through the pressure hole of the pressure plate 44. An anti-slip layer is provided on the countersunk hole 45 of the pressure hole, which can prevent the valve body 7 from rotating when the valve rod 77 is rotated, and prevent the valve body 7 from shifting position, thus ensuring the accuracy of air pressure detection.

[0034] In one embodiment of the present invention, the clamping component 5 includes a rotating jaw 51, a clamping block 53 is provided on the clamping arm 52 of the rotating jaw 51, a clamping groove 54 is provided on the clamping block 53, and the clamping grooves 54 on the plurality of clamping blocks 53 form a limiting hole that matches the valve stem 77. A protrusion 55 is provided on the clamping block 53, and a groove that matches the protrusion 55 is provided on the clamping arm 52.

[0035] Specifically, the rotating gripper 51 synchronously drives the gripping blocks 53 on multiple gripping arms 52 to grip the valve stem 77 of the valve body 7. The gripping grooves 54 on the multiple gripping blocks 53 form limiting holes that match the valve stem 77, which can clamp and limit the valve stem 77, avoid slippage and other problems when rotating the valve stem 77 later, and ensure detection accuracy.

[0036] In one embodiment of the present invention, the rotating component 6 includes a rotating motor 61, which is mounted on the pressure support 43 and drivenly connected to the rotating table 62. The clamping component 5 is mounted on the base plate of the rotating table 62. The rotating motor 61 drives the base plate on the rotating table 62 to rotate and open / close the valve body 7 clamped by the clamping component 5.

[0037] Specifically, the rotary motor 61 drives the base plate on the rotary table 62 to rotate, thereby rotating and closing the valve body 7 held by the clamping component 5, completing the airtightness test of the valve body 7 opening and closing, and improving the test efficiency.

[0038] In one embodiment of the present invention, a detection plate 75 is provided on the clamping component 5, and a detection sensor 76 matching the detection plate 75 is provided on the pressing bracket 43.

[0039] Specifically, the detection sensor 76 detects the position of the detection piece 75 on the rotating gripper 51, which can detect the rotation angle of the valve stem 77 of the valve body 7, ensuring the complete opening or closing of the valve body 7, improving detection accuracy, and avoiding damage and relative movement caused by excessive opening and closing of the valve body 7.

[0040] In one embodiment of this utility model, the detection fixture 3 includes a body 31, on which a chamber 32 matching the valve body 7 is provided. A sealing step 33 matching the valve body 7 is provided on the chamber 32. A sealing ring is provided between the sealing step 33 and the valve body 7. An air inlet 34 and an air outlet 35 are provided on the chamber 32. The air passage assembly 2 is connected to the air inlet 34 and the air outlet 35.

[0041] Specifically, the valve body 7 to be tested is placed on the chamber 32 of the testing fixture 3. A sealing ring is provided between the valve body 7 and the sealing step 33 on the chamber 32. The valve body 7 passes through the pressing hole of the pressing plate 44. Fluid is introduced into the chamber to test the air tightness, thereby improving the efficiency of the air tightness test of the valve body 7.

[0042] In one embodiment of this utility model, a first plate 71 is provided on the detection station, a first waist-shaped groove 72 is provided on the first plate 71, a second plate 73 is provided on the first plate 71, and a second waist-shaped groove 74 is provided on the second plate 73. The first waist-shaped groove 72 is perpendicular to the length direction of the first waist-shaped groove 72. A first bolt is provided on the first waist-shaped groove 72. The first plate 71 is connected to the machine base 1 by the first bolt. A second bolt is provided on the second waist-shaped groove 74. The second plate 73 is connected to the first plate 71 by the second bolt. The detection fixture 3 is provided on the second plate 73.

[0043] Specifically, the first waist-shaped groove 72 is set perpendicular to the length direction of the first waist-shaped groove 72. The first plate 71 is connected to the machine base 1 by the first bolt, and the second plate 73 is connected to the first plate 71 by the second bolt. The position of the detection fixture 3 can be adjusted in the plane by the first plate 71 and the second plate 73 to ensure the relative matching accuracy of the valve body 7 for the pressure plate 44 and the switch assembly, and improve the subsequent detection efficiency.

[0044] In one embodiment of this utility model, the gas path assembly 2 includes an inlet pipe and an outlet pipe 22. The inlet pipe is connected to the inlet hole 34 on the testing fixture 3, and the outlet pipe 22 is connected to the outlet hole 35. A flow meter 23 is provided on the outlet pipe 22. The free end of the inlet pipe is connected to a pressure reducing valve 25. A pressure gauge 26 is provided on the inlet pipe. The pressure reducing valve 25 is connected to the gas storage tank 28 through a pipeline 27.

[0045] Specifically, gas at a certain pressure is introduced into the chamber 32 of the testing fixture 3 through the air inlet pipe. The rotary motor 61 drives the base plate on the rotary table 62 to rotate, thereby rotating and opening the valve body 7 held by the clamping component 5. This allows the gas to pass through the chamber 32 and be discharged through the air outlet pipe 22. The flow meter 23 on the air outlet pipe 22 can monitor the gas in real time, so as to introduce fluid into the valve body 7 for airtightness testing, thereby improving the efficiency of the airtightness testing of the valve body 7.

[0046] In one embodiment of this utility model, a control valve 24 is provided on the intake pipe, the control valve 24 is connected to the exhaust pipe 21, and both the exhaust pipe 21 and the outlet pipe 22 are provided with mufflers.

[0047] Specifically, the rotary motor 61 drives the base plate on the rotary table 62 to rotate, thereby rotating and closing the valve body 7 held by the clamping component 5. After the detection of the valve body 7 is completed, the control valve 24 exhausts the gas through the exhaust pipe 21, which can quickly release the detection gas pressure.

[0048] In one embodiment of this utility model, the pressure hole is provided with a countersunk hole 45 that matches the valve body 7. The depth of the countersunk hole 45 is less than the height of the boss on the valve body 7, and the countersunk hole 45 is provided with an anti-slip layer.

[0049] Specifically, the valve body 7 is installed in the pressure hole of the pressure plate 44. An anti-slip layer is provided on the countersunk hole 45 of the pressure hole to prevent the valve body 7 from rotating when the valve stem 77 is rotated, thus preventing the valve body 7 from shifting position, ensuring reliable positioning, preventing movement, and guaranteeing the accuracy of air pressure detection.

[0050] Usage process

[0051] The valve body 7 to be tested is placed on the chamber 32 of the testing fixture 3. A sealing ring is provided between the valve body 7 and the sealing step 33 on the chamber 32. The pressing cylinder 42 drives the pressing plate 44 on the pressing bracket 43 to move towards the testing fixture 3, so that the valve body 7 passes through the pressing hole of the pressing plate 44. An anti-slip layer is provided on the countersunk hole 45 located in the pressing hole to prevent the valve body 7 from rotating when the valve stem 77 is rotated, thus preventing the valve body 7 from shifting position and ensuring the accuracy of air pressure detection. The rotating gripper 51 synchronously drives the clamping blocks 53 on multiple clamping arms 52 to clamp the valve stem 77 of the valve body 7. The clamping grooves 54 on the multiple clamping blocks 53 form limiting holes that match the valve stem 77. The valve stem 77 can be clamped and limited to avoid slippage during subsequent rotation, ensuring detection accuracy. Gas at a certain pressure is introduced into the chamber 32 of the detection fixture 3 through the air inlet pipe. The rotary motor 61 drives the base plate on the rotary table 62 to rotate, thereby opening the valve body 7 held by the clamping component 5. The gas is discharged through the air outlet pipe 22 after passing through the chamber 32. The flow meter 23 on the air outlet pipe 22 can monitor the gas in real time. The rotary motor 61 drives the base plate on the rotary table 62 to rotate, thereby closing the valve body 7 held by the clamping component 5. After the detection of the valve body 7 is completed, the control valve 24 returns the gas to the gas storage tank 28 through the pressure reducing valve 25.

[0052] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A zero-adjustment structure for an expansion valve, characterized in that, include: The machine is equipped with a testing station, and the testing station is equipped with a testing fixture that matches the valve body; A switch assembly is disposed above the detection fixture. The switch assembly includes a clamping component and a rotating component. The rotating component is used to rotate the valve body clamped by the clamping component to open and close the valve body. A pressing assembly is provided on the machine base. The pressing assembly is provided with a pressing plate and a pressing hole that matches the valve body. The switching assembly is disposed opposite to the pressing hole. The pressing assembly is used to drive the pressing plate to press the valve body held by the clamping component onto the testing fixture. An air circuit assembly is connected to the testing fixture, and the air circuit assembly is used to pressurize and depress the testing fixture to perform airtightness testing on the valve body.

2. The expansion valve zero-adjustment structure as described in claim 1, characterized in that, The pressing assembly includes a pressing frame, which is mounted on the machine base. A pressing cylinder is mounted on the pressing frame and is drivenly connected to the pressing bracket. A pressing plate is mounted at the bottom of the pressing bracket, and a switching assembly is mounted on the pressing bracket. The pressing cylinder drives the pressing plate to press the valve body onto the detection fixture so that the clamping component can clamp the valve stem on the valve body.

3. The expansion valve zero-adjustment structure as described in claim 2, characterized in that, The clamping component includes a rotating jaw, a clamping block is provided on the clamping arm of the rotating jaw, a clamping groove is provided on the clamping block, the clamping grooves on multiple clamping blocks form a limiting hole that matches the valve stem, a protrusion is provided on the clamping block, and a groove that matches the protrusion is provided on the clamping arm.

4. The expansion valve zero-adjustment structure as described in claim 2, characterized in that, The rotating component includes a rotary motor, which is mounted on a pressure support and driven by a rotary table. The clamping component is mounted on the base plate of the rotary table, and the rotary motor drives the base plate on the rotary table to rotate and open / close the valve body held by the clamping component.

5. The expansion valve zero-adjustment structure as described in claim 4, characterized in that, The clamping component is provided with a detection plate, and the pressure bracket is provided with a detection sensor that matches the detection plate.

6. The expansion valve zero-adjustment structure as described in claim 1, characterized in that, The testing fixture includes a body, on which a chamber matching the valve body is formed. A sealing step matching the valve body is provided on the chamber. A sealing ring is provided between the sealing step and the valve body. An air inlet and an air outlet are provided on the chamber. The air passage assembly is connected to the air inlet and the air outlet.

7. The expansion valve zero-adjustment structure as described in claim 1, characterized in that, The testing station is provided with a first plate, which has a first waist-shaped groove. A second plate is provided on the first plate, which has a second waist-shaped groove. The first waist-shaped groove is perpendicular to the length direction of the first waist-shaped groove. A first bolt is provided on the first waist-shaped groove. The first plate is connected to the machine base by the first bolt. A second bolt is provided on the second waist-shaped groove. The second plate is connected to the first plate by the second bolt. The testing fixture is provided on the second plate.

8. The expansion valve zero-adjustment structure as described in claim 6, characterized in that, The gas path assembly includes an inlet pipe and an outlet pipe. The inlet pipe is connected to an inlet hole on the testing fixture, and the outlet pipe is connected to the outlet hole. A flow meter is installed on the outlet pipe. The free end of the inlet pipe is connected to a pressure reducing valve. A pressure gauge is installed on the inlet pipe. The pressure reducing valve is connected to the gas storage tank through a pipeline.

9. The expansion valve zero-adjustment structure as described in claim 8, characterized in that, The intake pipe is equipped with a control valve, which is connected to the exhaust pipe. Both the exhaust pipe and the outlet pipe are equipped with mufflers.

10. The expansion valve zero-adjustment structure as described in claim 1, characterized in that, The pressure hole is provided with a countersunk hole that matches the valve body. The depth of the countersunk hole is less than the height of the boss on the valve body. The countersunk hole is provided with an anti-slip layer.

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