Valve tightness testing device

Abstract

The utility model relates to a valve sealing property testing arrangement, including detection case and support platform, its technical key point is: support platform is hollow round table and is equipped with with its intercommunication lower positioning ring on the upper surface, the lower surface of support platform is equipped with the extension pipe of inserting detection case bottom liquid layer, the outer circumferential surface of support platform is equipped with lower horizontal air inlet pipeline, the side of detection case is equipped with cantilever frame, and the longitudinal cylinder is fixed in cantilever frame top plate end, and the lower end of the cylinder rod of longitudinal cylinder is fixed with upper pressure seat, and upper pressure seat is hollow seat and is equipped with with its intercommunication upper positioning ring on the lower surface, and the center line of upper positioning ring and lower positioning ring coincides, and the outer circumferential surface of upper pressure seat is equipped with upper horizontal air inlet pipeline, and upper horizontal air inlet pipeline is equipped with the longitudinal air escape pipeline that end extends to the below of detection case bottom liquid layer. The device solves the problem that the accuracy of one-way detection needs to be improved, and the sealing property detection accuracy of valve body is significantly improved through bidirectional detection structure.

Description

Technical Field

[0001] This utility model relates to the technical field of valve testing equipment, specifically to a valve sealing performance testing device. Background Technology

[0002] Valves are commonly used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium. To ensure their effectiveness, quality inspection, including sealing tests, is usually performed during the manufacturing process using testing equipment.

[0003] In general testing, the valve is placed on a support platform, with its upper end connected to the air passage and its lower end connected to an external pipeline extending into the liquid. The valve is closed, and compressed gas is injected into the valve through the air passage. It is then observed whether bubbles emerge from the end of the external pipeline. This test is only a one-way detection, and its accuracy still needs improvement. Utility Model Content

[0004] The purpose of this invention is to provide a valve sealing performance testing device with a reasonable structure and reliable use, which solves the problem that the accuracy of unidirectional testing needs to be improved, and significantly improves the accuracy of valve body sealing performance testing through a bidirectional testing structure.

[0005] The technical solution of this utility model is: A valve sealing performance testing device includes a testing chamber and a support platform suspended below the testing chamber. The key technical features are: the support platform is a hollow frustum with a lower positioning ring communicating with it on its upper surface; an extension pipe inserted into the liquid layer at the bottom of the testing chamber is provided on the lower surface of the support platform; a first solenoid valve is provided on the extension pipe; a lower horizontal air inlet pipe is provided on the outer circumference of the support platform; a second solenoid valve is provided on the lower horizontal air inlet pipe; a cantilever frame is provided on the side of the testing chamber; a longitudinal cylinder is fixed to the end of the top plate of the cantilever frame; an upper pressure seat is fixed to the lower end of the cylinder rod of the longitudinal cylinder; the upper pressure seat is a hollow seat with an upper positioning ring communicating with it on its lower surface; the center lines of the upper and lower positioning rings coincide; an upper horizontal air inlet pipe is provided on the outer circumference of the upper pressure seat; a longitudinal vent pipe extending below the liquid layer at the bottom of the testing chamber is provided on the upper horizontal air inlet pipe; a third solenoid valve is provided at the upper end of the longitudinal vent pipe; and a fourth solenoid valve is provided at the beginning section of the upper horizontal air inlet pipe.

[0006] In the valve sealing test device described above, the outer circumferential surface of the support platform is provided with multiple support ribs, the ends of the support ribs are connected and fixed to the inner wall of the test chamber, and the outer end of the lower horizontal air inlet pipe passes through the side wall of the test chamber to reach the outside of the test chamber.

[0007] The valve sealing test device described above has a first camera module facing the end of the extension pipe and a first camera module facing the lower end of the longitudinal venting pipe fixed on the side wall of the test box.

[0008] The valve sealing test device described above comprises two first solenoid valves arranged at intervals on an extension pipe; two second solenoid valves arranged at intervals on a lower horizontal intake pipe; two third solenoid valves arranged at intervals on a longitudinal vent pipe; and two fourth solenoid valves arranged at intervals on an upper horizontal intake pipe.

[0009] In the valve sealing test device described above, a first pressure gauge is fixed to the bottom surface of the support platform, and a second pressure gauge is fixed to the top surface of the upper pressure seat.

[0010] The beneficial effects of this utility model are: Air can be alternately injected into the valve body using the upper and lower horizontal air intake lines, and the presence of air bubbles at the ends of the extension pipe and longitudinal vent pipe below the liquid surface can be observed to check the sealing degree between the valve seat 401 and the valve core 402 in the valve body (see [reference]). Figure 2 This device achieves bidirectional detection, solving the problem that the accuracy of unidirectional detection needs to be improved. The bidirectional detection structure significantly improves the accuracy of valve body sealing detection. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 A partial longitudinal cross-section view.

[0012] In the diagram: 1. Cantilever frame, 2. Longitudinal cylinder, 3. Upper pressure seat, 4. Valve to be tested, 401. Valve seat, 402. Valve core, 403. Valve stem, 5. Testing box, 6. First camera module, 7. Support rib, 8. Support platform, 9. Extension pipe, 10. Second solenoid valve, 11. Longitudinal vent pipe, 12. First camera module, 13. Lower horizontal air intake pipe, 14. Upper horizontal air intake pipe, 15. Fourth solenoid valve, 16. Third solenoid valve, 17. Second pressure gauge, 18. First pressure gauge, 19. Upper positioning ring, 20. Lower positioning ring. Detailed Implementation

[0013] The present invention will be described in detail with reference to the accompanying drawings.

[0014] like Figure 1 , Figure 2 As shown, the valve sealing test device includes a test box 5 and a support platform 8 suspended below the test box 5.

[0015] The support platform 8 is a hollow frustum with a lower positioning ring 20 communicating with it on its upper surface. An extension pipe 9, inserted into the liquid layer at the bottom of the detection chamber 5, is located on the lower surface of the support platform 8. A first solenoid valve (obscured in the figure) is mounted on the extension pipe 9. A lower horizontal air inlet pipe 13 is located on the outer circumference of the support platform 8, and a second solenoid valve 10 is mounted on the lower horizontal air inlet pipe 13. In this embodiment, multiple support ribs 7 are provided on the outer circumference of the support platform 8. The ends of the support ribs 7 are connected and fixed to the inner wall of the detection chamber 5. The outer end of the lower horizontal air inlet pipe 13 passes through the side wall of the detection chamber 5 to reach the outside of the detection chamber 5. There are two first solenoid valves, spaced apart on the extension pipe 9; there are two second solenoid valves 10, spaced apart on the lower horizontal air inlet pipe 13. A first pressure gauge 18 is fixed to the bottom surface of the support platform 8.

[0016] A cantilever frame 1 is provided on the side of the detection box 5, and a longitudinal cylinder 2 is fixed to the top end of the cantilever frame 1. An upper pressure seat 3 is fixed to the lower end of the cylinder rod of the longitudinal cylinder 2. The upper pressure seat 3 is a hollow seat and its lower surface is provided with an upper positioning ring 19 communicating with it. The center lines of the upper positioning ring 19 and the lower positioning ring 20 coincide. An upper horizontal air inlet pipe 14 is provided on the outer circumference of the upper pressure seat 3. A longitudinal vent pipe 11 extending to the bottom liquid layer of the detection box 5 is provided on the upper horizontal air inlet pipe 14. A third solenoid valve 16 is provided at the upper end of the longitudinal vent pipe 11, and a fourth solenoid valve 15 is provided at the beginning section of the upper horizontal air inlet pipe 14. In this embodiment, there are two third solenoid valves 16, which are arranged at intervals on the longitudinal vent pipe 11; there are two fourth solenoid valves 15, which are arranged at intervals on the upper horizontal air inlet pipe 14. A second pressure gauge 17 is fixed on the top surface of the upper pressure seat 3.

[0017] The detection box 5 has a first camera module 6 facing the end of the extension tube 9 and a first camera module 12 facing the lower end of the longitudinal venting pipe 11 fixed on its side wall.

[0018] Working principle: 1. Before testing, place the valve 4 to be tested on the support platform 8, insert the lower positioning ring 20 into the lower end tube of the valve, and ensure that the lower positioning ring 20 is in close contact with the inner wall of the lower end tube; the cylinder rod of the longitudinal cylinder 2 moves downward, causing the upper pressure seat 3 to press against the upper end tube of the valve 4 to be tested, and the upper positioning ring 19 is inserted into the upper end tube and in close contact with the inner wall of the upper end tube. An outer sheath is provided on the outside of the valve stem 403 of the valve.

[0019] 2. First, perform an upper air intake test. Specifically, inject compressed gas into the upper pressure seat 3 through the upper horizontal air intake pipe 14. The first and fourth solenoid valves 15 are in the open state, while the second solenoid valve 10 and the third solenoid valve 16 are in the closed state. The compressed gas accumulates in the upper pressure seat 3. Use the first camera module 6 to observe whether air bubbles are generated at the end of the extension pipe 9. At the same time, use the second pressure gauge 17 to detect whether the pressure value in the upper pressure seat 3 is rising steadily. Stop the test when the set value is reached and stabilized.

[0020] 3. Next, perform a lower air intake test. Specifically, compressed gas is injected into the support platform 8 through the lower horizontal air intake pipe 13. The second solenoid valve 10 and the third solenoid valve 16 are in the open state, while the first solenoid valve and the fourth solenoid valve 15 are in the closed state. The compressed gas accumulates in the support platform 8. The second camera module 12 is used to observe whether air bubbles are generated at the end of the longitudinal vent pipe 11. At the same time, the first pressure gauge 18 is used to detect whether the pressure value in the support platform 8 is rising steadily. The test stops when the set value is reached and stabilized.

[0021] 4. The number of the first solenoid valve, the second solenoid valve 10, the third solenoid valve 16, and the fourth solenoid valve 15 are two each, which is intended to ensure the reliability of the shut-off function.

[0022] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A valve sealing performance testing device, comprising a testing box and a support platform suspended below the testing box, characterized in that: The support platform is a hollow frustum with a lower positioning ring connected to its upper surface. An extension pipe, inserted into the liquid layer at the bottom of the detection chamber, is located on the lower surface of the support platform. A first solenoid valve is installed on the extension pipe. A lower horizontal air inlet pipe is located on the outer circumference of the support platform, and a second solenoid valve is installed on the lower horizontal air inlet pipe. A cantilever frame is located on the side of the detection chamber. A longitudinal cylinder is fixed to the end of the top plate of the cantilever frame. An upper pressure seat is fixed to the lower end of the cylinder rod of the longitudinal cylinder. The upper pressure seat is hollow, and an upper positioning ring is connected to its lower surface. The center lines of the upper and lower positioning rings coincide. An upper horizontal air inlet pipe is located on the outer circumference of the upper pressure seat. A longitudinal vent pipe, extending to below the liquid layer at the bottom of the detection chamber, is located on the upper horizontal air inlet pipe. A third solenoid valve is installed at the upper end of the longitudinal vent pipe, and a fourth solenoid valve is installed at the beginning section of the upper horizontal air inlet pipe.

2. The valve sealing performance testing device according to claim 1, characterized in that: The outer circumferential surface of the support platform is provided with multiple support ribs, the ends of which are connected and fixed to the inner wall of the test box, and the outer end of the lower horizontal air intake pipe passes through the side wall of the test box to reach the outside of the test box.

3. The valve sealing performance testing device according to claim 1, characterized in that: The side wall of the detection box is fixed with a first camera module facing the end of the extension tube and a first camera module facing the lower end of the longitudinal vent pipe.

4. The valve sealing performance testing device according to claim 1, characterized in that: The first solenoid valve consists of two valves, spaced apart on the extension pipe; the second solenoid valve consists of two valves, spaced apart on the lower horizontal intake pipe; the third solenoid valve consists of two valves, spaced apart on the longitudinal vent pipe; and the fourth solenoid valve consists of two valves, spaced apart on the upper horizontal intake pipe.

5. The valve sealing performance testing device according to claim 1, characterized in that: A first pressure gauge is fixed to the bottom surface of the support platform, and a second pressure gauge is fixed to the top surface of the upper pressure seat.

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