A high-efficiency precise airtightness inspection device and method

Abstract

The application discloses a kind of high-efficiency precision airtight inspection detection device and method, including nitrogen cylinder, primary pressure regulating mechanism, precision filter and gas storage chamber sequentially sealed connection along the direction of detection gas flow, a group or multiple groups of secondary pressure regulating mechanism are sealed to the gas storage chamber body Connection, the gas outlet end of the secondary pressure regulating mechanism connects the component to be measured.This inspection detection device can overcome the drawbacks of the above-mentioned conventional detection method, easy to operate, nitrogen is modulated after high-pressure pressure reducing valve and pressure reducing valve, each product air-tightness inspection only needs to control the panel fixed straight-through type manual stop valve in air-tightness inspection component and the panel fixed straight-through type manual stop valve commonly used in air-tightness inspection component two, read the pressure value displayed by pressure gauge at any time, can implement multi-channel product air-tightness inspection detection, realize product high-efficiency precision air-tightness inspection, and through the addition of precision filtering mechanism, can fully guarantee the cleanliness of modulated nitrogen, ensure test accuracy.

Description

Technical Field

[0001] This invention relates to the field of product airtightness testing technology, and in particular to a high-efficiency and precision airtightness inspection and testing device and method. Background Technology

[0002] Currently, a purchased general-purpose gas distribution platform is used to supply gas to the products. While this platform is highly versatile, it only has two branches (high-pressure and low-pressure), resulting in long pipelines, low testing accuracy, and unsuitability for high-efficiency, precision airtightness testing. The platform is expensive; due to the long pipelines, it lacks a precision filtration device that directly interfaces with the tested product, leading to insufficient cleanliness of the prepared nitrogen; the testing accuracy is low, the instantaneous gas response is poor, and there is a significant discrepancy between the pressure on the platform instruments and the pressure experienced by the tested product. Even minor gas leaks in the branches are not reflected on the platform's pressure gauges, affecting the accuracy of airtightness testing; and the testing dynamics of the product cannot be monitored, easily leading to misjudgments. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a high-efficiency and precision airtightness inspection and testing device and method. This inspection and testing device is easy to operate and can simultaneously perform airtightness inspections on multiple products. By adding a precision filtration mechanism, the cleanliness of the modulated nitrogen gas can be fully guaranteed, ensuring testing accuracy.

[0004] A high-efficiency and precision airtightness inspection and testing device includes a nitrogen cylinder, a primary pressure regulating and stabilizing mechanism, a precision filter, and a gas storage chamber that are sequentially and sealed along the direction of gas flow. One or more sets of secondary pressure regulating and stabilizing mechanisms are sealed and connected to the main body of the gas storage chamber. The outlet end of the secondary pressure regulating and stabilizing mechanism is connected to the component to be tested.

[0005] The primary pressure regulating and stabilizing mechanism includes a high-pressure reducing valve, a reducing valve, a manual shut-off valve one, a support base, and a manual shut-off valve two connected in sequence. The high-pressure reducing valve and the reducing valve are connected by a slip-fit ​​joint one and two sets of opposite sealing adapters one. The reducing valve and the manual shut-off valve one are connected by a slip-fit ​​joint two and two sets of opposite sealing adapters one and two sealing adapters two. The manual shut-off valve two and the precision filter are sealed together by a slip-fit ​​joint three and two sets of opposite sealing adapters two. The precision filter is connected to one end of the gas storage chamber by a sealing adapter three. The support base is also equipped with a pressure gauge one and a manual shut-off valve three used as a pressure relief valve.

[0006] The secondary pressure regulating and stabilizing mechanism includes a manual shut-off valve four, a pressure gauge base, and a pressure gauge two installed on the pressure gauge base, which are connected in sequence. The manual shut-off valve four is connected to the gas storage chamber through a loose-fitting sealing component one, and the gas outlet of the pressure gauge base is connected to the component to be tested through a metal flexible hose one.

[0007] The other end of the gas storage chamber is equipped with a slip-on sealing component two, and the outlet end of the slip-on sealing component two is equipped with a manual shut-off valve five for depressurization after the test is completed.

[0008] As a preferred embodiment of the above technical solution, the three loose fittings have the same structure, and the two ends of their connecting pipes are spherical and are sealed to fit with the tapered opening at one end of the sealing adapter and the sealing adapter.

[0009] As a preferred embodiment of the above technical solution, the other end of the sealing adapter is provided with a copper sealing gasket and the outer ring is provided with connecting threads.

[0010] As a preferred embodiment of the above technical solution, the other end of the second sealing adapter is provided with a spherical sealing gasket and the inner ring is provided with connecting threads.

[0011] As a preferred embodiment of the above technical solution, the sealing adapter three is a two-section shaft structure, with a spherical sealing gasket two inside the large end and a connecting thread on the inner ring, and a connecting thread on the outer ring of the small end, and a copper sealing gasket one sleeved at the diameter-changing part.

[0012] As a preferred embodiment of the above technical solution, both the first and second loose-fitting sealing components include a sealing adapter four. The sealing adapter four is a two-section shaft structure. The inner ring of its large end is provided with a connecting thread and connected to a loose-fitting connector. A copper sealing gasket two is provided between one end of the loose-fitting connector and the sealing adapter four. A loose-fitting nut one is fitted on the other end. The outer ring of the small end is provided with a connecting thread, and a copper sealing flat gasket two is fitted at the diameter-changing part.

[0013] As a preferred embodiment of the above technical solution, the gas storage chamber is provided in multiple sets, and adjacent sets of gas storage chambers are connected by a sealing adapter five, a slip-on nut two, and a metal hose two.

[0014] As a preferred embodiment of the above technical solution, a conical sealing gasket is provided on the contact surface between the sealing adapter five and the metal hose two.

[0015] As a preferred embodiment of the above technical solution, the manual shut-off valve four is a panel-fixed straight-through manual shut-off valve.

[0016] The beneficial effects of this invention are as follows:

[0017] This inspection and testing device overcomes the drawbacks of conventional testing methods. It is easy to operate. After the nitrogen is regulated by the high-pressure reducing valve and the pressure reducing valve, each product's airtightness test only requires controlling the panel-fixed straight-through manual shut-off valve in the airtightness test component and the common panel-fixed straight-through manual shut-off valve in the second airtightness test component. By constantly reading the pressure value displayed on the pressure gauge, multiple product airtightness tests can be carried out, achieving efficient and precise airtightness testing of products. Furthermore, by adding a precision filtration mechanism, the cleanliness of the regulated nitrogen can be fully guaranteed, ensuring test accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a partial structural schematic diagram of the gas storage chamber of the present invention.

[0020] Figure 3 This is a schematic diagram of either the first or second loose-fitting sealing component.

[0021] Figure 4 This is a top view of the supporting base.

[0022] The attached diagram is labeled as follows: 1-Nitrogen cylinder, 2-Precision filter, 3-Gas storage chamber, 4-High-pressure reducing valve, 5-Reducing valve, 6-Manual shut-off valve I, 7-Support base, 8-Manual shut-off valve II, 9-Loose fitting I, 10-Sealing adapter I, 11-Loose fitting II, 12-Sealing adapter II, 13-Loose fitting III, 14-Sealing adapter III, 15-Pressure gauge I, 16-Manual shut-off valve III, 17-Manual shut-off valve IV, 18-Pressure gauge... 19-Pressure Gauge II, 20-Metal Hose I, 21-Manual Shut-off Valve V, 22-Copper Sealing Gasket I, 23-Spherical Sealing Gasket I, 24-Spherical Sealing Gasket II, 25-Copper Sealing Flat Gasket I, 26-Sealing Adapter IV, 27-Union Joint, 28-Copper Sealing Gasket II, 39-Slipper Nut I, 30-Copper Sealing Flat Gasket II, 31-Sealing Adapter V, 32-Slipper Nut II, 33-Metal Hose II, 34-Conical Sealing Gasket. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] like Figures 1 to 4The device for testing and inspecting high-efficiency and precision airtightness includes a nitrogen cylinder 1, a primary pressure regulating and stabilizing mechanism, a precision filter 2, and a gas storage chamber 3, which are sequentially and sealed along the direction of gas flow. One or more secondary pressure regulating and stabilizing mechanisms are sealed on the gas storage chamber 3. The outlet of the secondary pressure regulating and stabilizing mechanism is connected to the component to be tested.

[0025] The primary pressure regulating and stabilizing mechanism includes a high-pressure reducing valve 4, a reducing valve 5, a manual shut-off valve 6, a support base 7, and a manual shut-off valve 8 connected in sequence. The high-pressure reducing valve 4 and the reducing valve 5 are connected by a slip-on joint 9 and two sets of sealing adapters 10 arranged opposite to each other. The reducing valve 5 and the manual shut-off valve 6 are connected by a slip-on joint 11 and two sets of sealing adapters 10 and 12 arranged opposite to each other. The manual shut-off valve 8 and the precision filter 2 are sealed together by a slip-on joint 12 and two sets of sealing adapters 12 arranged opposite to each other. The precision filter 2 is connected to one end of the gas storage chamber 3 by a sealing adapter 14. The support base 7 is also equipped with a pressure gauge 15 and a manual shut-off valve 16 used as a pressure relief valve.

[0026] The secondary pressure regulating and stabilizing mechanism includes a manual shut-off valve 17, a pressure gauge base 18, and a pressure gauge 19 installed on the pressure gauge base 18, which are connected in sequence. The manual shut-off valve 17 is connected to the gas storage chamber 3 through a loose-fitting sealing component. The gas outlet of the pressure gauge base 18 is connected to the component to be tested through a metal flexible hose 20.

[0027] The other end of the gas storage chamber 3 is equipped with a slip-on sealing component 2, and the outlet end of the slip-on sealing component 2 is equipped with a manual shut-off valve 5 21 for depressurization after the test is completed.

[0028] In this embodiment, the slip-fitting joint 19, slip-fitting joint 21, and slip-fitting joint 313 have the same structure, and the two ends of their connecting pipes are spherical and are sealed to fit with the tapered opening at one end of the sealing adapter 10 and sealing adapter 212.

[0029] In this embodiment, the other end of the sealing adapter 10 is provided with a copper sealing gasket 22 and the outer ring is provided with connecting threads.

[0030] In this embodiment, the other end of the sealing adapter 12 is provided with a spherical sealing gasket 23 and the inner ring is provided with connecting threads.

[0031] In this embodiment, the sealing adapter 314 is a two-section shaft structure. The large end is also provided with a spherical sealing gasket 24 and the inner ring is provided with a connecting thread. The small end is provided with a connecting thread on the outer ring, and a copper sealing gasket 25 is fitted at the diameter-changing part.

[0032] In this embodiment, both the first and second loose-fitting sealing components include a sealing adapter 26. The sealing adapter 26 is a two-section shaft structure. The inner ring of the larger end is provided with a connecting thread and connected to a loose-fitting connector 27. A copper sealing gasket 28 is provided between one end of the loose-fitting connector 27 and the sealing adapter 26. A loose-fitting nut 29 is fitted on the other end. The outer ring of the smaller end is provided with a connecting thread, and a copper sealing flat gasket 30 is fitted at the diameter-changing part.

[0033] In this embodiment, the gas storage chamber 3 is provided in multiple sets, and adjacent sets of gas storage chambers 3 are connected by a sealing adapter 31, a slip-on nut 32 and a metal hose 33.

[0034] In this embodiment, a conical sealing gasket 34 is provided on the contact surface between the sealing adapter 31 and the metal hose 33.

[0035] In this embodiment, the manual shut-off valve 417 is a panel-fixed straight-through manual shut-off valve.

[0036] In this embodiment, the high-pressure reducing valve 4 is model GENTC 591IN-3000, the reducing valve 5 is model R07-04C, the manual shut-off valve 1 6, manual shut-off valve 2 8, and manual shut-off valve 3 16 are all model XJ / J03-40 / 10 DN10 PN40, the manual shut-off valve 4 17 is a panel-fixed straight-through manual shut-off valve model XJ / J03M-40 / 04, the precision filter 2 is model XJ / G01 / 10-35(10μ), the pressure gauge 1 15 and pressure gauge 2 19 are 0.6MPa and 0.4 grade specifications, and the metal hose 1 20 and metal hose 2 33 are both model JR6BL1-300 PN=23MPa.

[0037] During operation, the high-pressure reducing valve 4 coarsely adjusts the nitrogen pressure output from the nitrogen cylinder 1, making the output pressure slightly higher than the pressure required by the product being tested by 0.1 MPa; the reducing valve 5 precisely adjusts the nitrogen pressure to the pressure required by the product being tested; the manual reducing valve and pressure gauge work together to assist the reducing valve 5 in adjusting the pressure to the pressure required by the product being tested; the precision filter 2 is used to filter impurities in the nitrogen and excess matter (burrs, rust, dirt, etc.) in the pre-gas path, supplying the product being tested with highly clean nitrogen.

[0038] The specific testing method of this high-efficiency and precision airtightness inspection and testing device is as follows:

[0039] Before ventilating the product, check that all manual shut-off valves are in the shut-off position (closed).

[0040] Slowly rotate the hand dial on the top of nitrogen cylinder 1 counterclockwise to turn on the nitrogen source.

[0041] Slowly rotate the handle of the high-pressure reducing valve 4 clockwise while observing the pressure gauge reading at the output end of the reducing valve 5. Stop rotating the handle of the high-pressure reducing valve 4 when the pressure gauge reading rises to 1.05 times (or 0.1 MPa) of the pressure required by the product being tested.

[0042] Rotate the hexagonal screw at the top of the pressure reducing valve 5 counterclockwise with a wrench. Observe the slider in the side cavity of the pressure reducing valve 5 move upward until it rises to the top (until the hexagonal screw can no longer be rotated). At this time, the pressure reducing valve 5 should be in the shut-off state.

[0043] Open manual shut-off valve 6. Use a wrench to slowly rotate the hexagonal screw at the top of pressure reducing valve 5 clockwise. The air pressure output (outlet) of pressure reducing valve 5 will gradually increase. Observe the reading of pressure gauge 15 while rotating, until the reading of pressure gauge 15 reaches 1.05 times the pressure of the product being tested. Stop rotating the handle of pressure reducing valve 5. If the reading of pressure gauge 15 exceeds 1.05 times the pressure of the product being tested, use a wrench to slowly rotate the hexagonal screw at the top of pressure reducing valve 5 counterclockwise by half a turn. Then open manual shut-off valve 316 and close it. Use a wrench to slowly rotate the hexagonal screw at the top of pressure reducing valve 5 clockwise. The air pressure output (outlet gauge pressure) of pressure reducing valve 5 will gradually increase. Observe the reading of pressure gauge 15 while rotating, until the reading of pressure gauge 15 reaches 1.05 times the pressure of the product being tested.

[0044] Inspect the product being tested and the air-pressurizing equipment (sealing end caps, airtight connectors, etc.) to ensure they are free of oil stains, burrs, rust spots, and excess material in the sealing groove.

[0045] Open manual shut-off valve 28, and then open manual shut-off valve 417 in each branch pipeline one by one. Use 0.3MPa nitrogen to purge any excess material in each branch pipeline during the airtightness check, and then close manual shut-off valve 417 in each branch pipeline one by one. Similarly, open manual shut-off valve 417 in the loop sealing component 2, use 0.3MPa nitrogen to purge any excess material in the gas storage chamber 3 during the airtightness check, and then close manual shut-off valve 417.

[0046] Purge the air-pressing fixtures (sealed end caps, airtight connectors, etc.) with 0.3 MPa nitrogen. Connect the conical sealing gasket 34 to the metal hose 20 and the six air-pressing fixtures (sealed end caps, airtight connectors, etc.) in the airtightness inspection component and tighten them. Cover the outlet of the air-pressing fixtures (sealed end caps, airtight connectors, etc.) with a clean cloth, open the manual shut-off valve 17 in the corresponding branch of the product under test, and supply 0.3 MPa air pressure for at least 30 seconds. Close the manual shut-off valve 17 in the corresponding branch of the product under test, remove the clean cloth, and use a 5x magnifying glass to check for any foreign matter on the clean white cloth that has been purged with nitrogen. This will help determine the cleanliness of the nitrogen and the absence of foreign matter in the pipeline. Repeat this process to check the remaining pipelines for foreign matter. Finally, only after the clean white cloth that has been purged with nitrogen is free of foreign matter can the product under test be installed and the airtightness inspection performed.

[0047] Open the manual shut-off valve 4.17 in the corresponding branch of the product under test, and inflate to the specified pressure as specified in the corresponding process procedure of the product under test. Then close the manual shut-off valve 4.17 in the branch. Close the manual shut-off valve 2.8. After the air pressure stabilizes for 5 minutes, start timing and record the pressure, time, and temperature at this time.

[0048] After holding the pressure for the specified time, record the pressure, time, and temperature at that point.

[0049] Pressure drop correction:

[0050] Because the airtightness testing chamber of this airtightness inspection and testing agency is small and very sensitive to temperature, the testing pressure of the product needs to be adjusted according to changes in the ambient temperature.

[0051] The effect of ambient temperature changes on pressure can be corrected according to Formula 1 in QJ2652-1994 "General Specifications for Gas Distribution Platforms":

[0052] …………………………(1)

[0053] Where: T1—ambient temperature at the start of the test, K;

[0054] T2—Ambient temperature after the corresponding pressure holding time, in K;

[0055] p1—Pressure at the start of the test, MPa;

[0056] p2 — Pressure after the corresponding holding time, in MPa.

[0057] Temperature can be converted using Formula 2:

[0058] ………………………(2)

[0059] Where: T—ambient temperature at the start of the test and after pressure holding, in K;

[0060] t—Ambient temperature at the start of the test and after pressure holding, in °C.

[0061] The product's airtightness is determined based on the sum of the measured value and the pressure correction value.

[0062] After the product passes inspection, open the manual shut-off valve 21 in the second loop sealing component. Slowly release the pressure of the corresponding manual shut-off valve 17 in each branch of the tested product until the air pressure in each branch drops to zero. Replace with a new tested product. Close the manual shut-off valve 21 in the second loop sealing component and the manual shut-off valve 17 in the corresponding branch.

[0063] When multimedia recording is required, photos should be taken and multimedia recording should be performed.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-efficiency and precision airtightness inspection and testing device, characterized in that: It includes a nitrogen cylinder, a primary pressure regulating and stabilizing mechanism, a precision filter, and a gas storage chamber that are sequentially and sealed along the direction of gas flow. One or more secondary pressure regulating and stabilizing mechanisms are sealed on the gas storage chamber body, and the outlet of the secondary pressure regulating and stabilizing mechanism is connected to the component under test. The primary pressure regulating and stabilizing mechanism includes a high-pressure reducing valve, a reducing valve, a manual shut-off valve one, a support base, and a manual shut-off valve two connected in sequence. The high-pressure reducing valve and the reducing valve are connected by a slip-fit ​​joint one and two sets of opposite sealing adapters one. The reducing valve and the manual shut-off valve one are connected by a slip-fit ​​joint two and two sets of opposite sealing adapters one and two sealing adapters two. The manual shut-off valve two and the precision filter are sealed together by a slip-fit ​​joint three and two sets of opposite sealing adapters two. The precision filter is connected to one end of the gas storage chamber by a sealing adapter three. The support base is also equipped with a pressure gauge one and a manual shut-off valve three used as a pressure relief valve. The secondary pressure regulating and stabilizing mechanism includes a manual shut-off valve four, a pressure gauge base, and a pressure gauge two installed on the pressure gauge base, which are connected in sequence. The manual shut-off valve four is connected to the gas storage chamber through a loose-fitting sealing component one, and the gas outlet of the pressure gauge base is connected to the component to be tested through a metal flexible hose one. The other end of the gas storage chamber is equipped with a slip-on sealing component two, and the outlet end of the slip-on sealing component two is equipped with a manual shut-off valve five for depressurization after the test is completed.

2. The high-efficiency precision airtightness inspection and testing device according to claim 1, characterized in that: The three slip-fitting joints have the same structure, and the two ends of their connecting pipes are spherical and are sealed to fit with the tapered opening at one end of the sealing adapter one and sealing adapter two.

3. The high-efficiency precision airtightness inspection and testing device according to claim 2, characterized in that: The other end of the sealing adapter is provided with a copper sealing gasket and the outer ring is provided with connecting threads.

4. The high-efficiency precision airtightness inspection and testing device according to claim 2, characterized in that: The other end of the second sealing adapter is provided with a spherical sealing gasket and the inner ring is provided with connecting threads.

5. The high-efficiency precision airtightness inspection and testing device according to claim 1, characterized in that: The sealing adapter three is a two-section shaft structure. The large end is also provided with a spherical sealing gasket two and the inner ring is provided with connecting threads. The small end is provided with connecting threads on the outer ring and a copper sealing flat gasket one is fitted at the diameter change part.

6. The high-efficiency and precision airtightness inspection and testing device according to claim 1, characterized in that: Both the first and second loose-fitting sealing components include a sealing adapter four. The sealing adapter four is a two-section shaft structure. The inner ring of its large end is provided with a connecting thread and connected to a loose connector. A copper sealing gasket two is provided between one end of the loose connector and the sealing adapter four. A loose nut one is fitted on the other end. The outer ring of the small end is provided with a connecting thread, and a copper sealing flat gasket two is fitted at the diameter-changing part.

7. The high-efficiency and precision airtightness inspection and testing device according to claim 1, characterized in that: The gas storage chamber is provided in multiple sets, and adjacent sets of gas storage chambers are connected by a sealing adapter five, a loose nut two, and a metal hose two.

8. The high-efficiency precision airtightness inspection and testing device according to claim 7, characterized in that: The contact surface between the sealing adapter five and the metal hose two is provided with a conical sealing gasket.

9. The high-efficiency and precision airtightness inspection and testing device according to claim 1, characterized in that: The manual shut-off valve four is a panel-fixed straight-through manual shut-off valve.

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