Self-rescuer comprehensive performance calibrator

Abstract

This invention relates to the field of calibration equipment technology, specifically to a comprehensive performance calibrator for self-rescue devices, comprising: a second interface; an air pump sequentially connected to a low-pressure switching valve, a shut-off valve, the second interface, a U-shaped pressure gauge, and a constant-volume chamber. It also includes: a third interface; the third interface sequentially connected to a first reversing valve, a third flow meter, a second reversing valve, and a third reversing valve; the third reversing valve is connected to the constant-volume chamber. Furthermore, it includes: a fourth interface; the fourth interface is connected to a second flow meter. Finally, it includes: a fifth interface; the fifth interface sequentially connected to a first flow meter, a precision pressure reducer, a low-pressure air source valve, and a low-pressure air source; a low-pressure air source pressure gauge is installed between the first flow meter and the precision pressure reducer. The fifth interface is also sequentially connected to a second reversing valve, a third flow meter, the first reversing valve, and the low-pressure switching valve. It features high functional integration and is compatible with the testing of both chemical oxygen self-rescue devices and compressed oxygen self-rescue devices, improving calibration efficiency and convenience.

Description

Technical Field

[0001] This invention relates to the field of calibration equipment technology, specifically to a self-rescue device comprehensive performance calibration instrument. Background Technology

[0002] Self-rescue devices are core protective equipment used by workers in high-risk industries such as coal mines and chemical plants to escape independently and maintain their lives in emergencies such as gas explosions, fires, or oxygen deficiency and asphyxiation underground. Based on their working principles, they can be divided into two main categories: chemical oxygen self-rescue devices and isolated compressed oxygen self-rescue devices. Their performance and reliability directly affect the wearer's life safety. Therefore, according to the national standard GB24502-2023 "Self-Rescue Devices for Coal Mines," self-rescue devices must undergo rigorous verification of core indicators such as airtightness, breathing resistance, oxygen supply performance, exhaust valve characteristics, and gas storage bag performance before use and during regular maintenance.

[0003] Existing self-rescue device testing technologies are no longer fully compatible with the testing requirements under the GB24502-2023 standard due to their fragmented equipment, complex operation, and difficulty in guaranteeing accuracy. Therefore, there is an urgent need to develop a comprehensive self-rescue device performance calibrator that is compact, functionally integrated, and easy to operate, in order to solve the problems of low testing efficiency, large errors, and poor compatibility in existing technologies. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a comprehensive performance verification instrument for self-rescue devices, which has a high degree of functional integration and can be compatible with the testing of both chemical oxygen self-rescue devices and compressed oxygen self-rescue devices, thereby improving verification efficiency and convenience.

[0005] The technical solution adopted by this invention to solve its technical problem is: A self-rescue device comprehensive performance verification instrument, comprising: Second interface; The air pump is connected in sequence to a low-pressure switching valve, a shut-off valve, a second interface, a U-shaped pressure gauge, and a constant-volume chamber.

[0006] Furthermore, a self-rescue device comprehensive performance verification instrument includes: Third interface; The third interface is connected in sequence to the first reversing valve, the third flow meter, the second reversing valve, and the third reversing valve; The third directional valve is connected to the constant volume chamber.

[0007] Furthermore, a self-rescue device comprehensive performance verification instrument includes: Fourth interface; The fourth interface is connected to a second flow meter.

[0008] Furthermore, a self-rescue device comprehensive performance verification instrument includes: Fifth interface; The fifth interface is connected in sequence to the first flow meter, the precision pressure reducer, the low-pressure gas source valve, and the low-pressure gas source; A low-pressure gas source pressure gauge is installed between the first flow meter and the precision pressure reducer.

[0009] Furthermore, the fifth interface is also connected in sequence to the second reversing valve, the third flow meter, the first reversing valve, and the low-pressure switching valve; The fifth interface is also connected to an exhaust valve and a pressure gauge.

[0010] Furthermore, the second interface is sequentially connected to a U-shaped pressure gauge, a constant volume chamber, a third reversing valve, a second reversing valve, a third flow meter, a first reversing valve, and a low-pressure switching valve.

[0011] Furthermore, a self-rescue device comprehensive performance verification instrument includes: First interface; The first interface is connected to a low-pressure switching valve.

[0012] Furthermore, the constant-volume cavity includes: The cylindrical body is equipped with interfaces; The first end is detachably mounted on the upper end of the cylinder and is equipped with an interface; The second end is detachably located at the lower end of the cylinder.

[0013] Furthermore, a correction mechanism is provided inside the cylinder, the correction mechanism including: The bimetallic strip is vortex-shaped and its outer end is fixedly connected to the cylinder. A nut is fixedly installed at the inner end of the bimetallic strip; The lifting plate is installed inside the cylinder and can be raised and lowered. The lead screw is located at the upper end of the lifting plate and is connected to the nut for transmission.

[0014] Furthermore, the lifting plate is equipped with an airbag, which is sealed to the cylinder.

[0015] The beneficial effects of this invention are: (1) By integrating multiple functional modules such as air tightness testing, breathing resistance testing, oxygen supply performance testing, exhaust valve characteristic testing and gas storage bag testing into one device, and also being compatible with the performance testing of both chemical oxygen self-rescue devices and compressed oxygen self-rescue devices, the problem of dispersed equipment and large space occupation in traditional testing is solved.

[0016] (2) By setting multiple reversing valves and low-pressure switching valves, the testing station can be quickly switched. At the same time, standardized interfaces are prefabricated, which replaces the traditional pipeline disassembly and assembly process, significantly improving the testing efficiency and reducing the dependence on the skill level of the operators.

[0017] (3) The built-in correction mechanism of the constant volume chamber can automatically adjust the internal volume through the thermal expansion and contraction characteristics of the bimetallic strip. When the temperature changes, the bimetallic strip deforms with the temperature, causing the nut to rotate, which drives the screw to control the lifting plate to rise and fall, and simultaneously drives the sealed airbag to expand and contract. By adjusting the volume of the constant volume chamber, the pressure fluctuation caused by the thermal expansion and contraction of the gas is offset, avoiding the measurement error caused by the heat release of gas compression during inflation and the temperature drop during the pressure holding stage, thus ensuring the stability and accuracy of the test data. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the piping system of the present invention; Figure 2 This is a schematic diagram of the structure of a constant-volume cavity; Figure 3 This is a partial sectional view of a constant-volume cavity; Figure 4 This is a partial sectional view of the correction mechanism.

[0020] In the picture: 1. Air pump, 2. Low-pressure switching valve, 3. First port, 4. Shut-off valve, 5. Second port, 6. Third port, 7. First directional valve, 8. Second directional valve, 9. Third directional valve, 10. Fourth port, 11. Fifth port, 12. Exhaust valve, 13. Pressure gauge, 14. First flow meter, 15. Precision pressure reducer, 16. Low-pressure air source valve, 17. Low-pressure air source, 18. Low-pressure air source pressure gauge, 19. Second flow meter, 20. Constant volume chamber, 21. Third flow meter, 22. U-shaped pressure gauge; 201. First end; 202. Cylinder body; 203. Second end; 204. Correction mechanism; 2041. Bimetallic strip, 2042. Nut, 2043. Lead screw, 2044. Lifting plate, 2045. Airbag. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, this invention provides a comprehensive performance calibration instrument for self-rescue devices. Through pipeline connections and valve switching, it can perform multiple testing functions, including testing the airtightness of the breathing system of compressed oxygen self-rescue devices and chemical oxygen self-rescue devices. Furthermore, it adopts a compact cabinet structure, with various control valves and display instruments arranged in sections on the panel, clearly labeled. Operators can perform pressure observation, flow adjustment, and valve switching from a single viewpoint.

[0023] A self-rescue device comprehensive performance verification instrument includes a second interface 5. An air pump 1 is sequentially connected to a low-pressure switching valve 2, a shut-off valve 4, the second interface 5, a U-shaped pressure gauge 22, and a constant-volume chamber 20. Through this pathway, the airtightness of the breathing system of both chemical oxygen self-rescue devices and compressed oxygen self-rescue devices can be tested. In a specific embodiment, the low-pressure switching valve 2 is simultaneously connected to both the positive and negative pressure ends generated by the air pump 1, allowing switching according to operating conditions and controlling the subsequent pipeline to switch between positive pressure supply and negative pressure suction modes. The rear end of the low-pressure switching valve 2 can be connected to a first reversing valve 7 and a shut-off valve 4, or to the first interface 3.

[0024] When testing the airtightness of the breathing system of the chemical oxygen self-rescue device, the second interface 5 is connected to the breathing port of the self-rescue device. Press the low-pressure switching valve 2 to the negative pressure end, slowly open the shut-off valve 4, turn on the power switch of the air pump 1, and make the pressure in the breathing system of the self-rescue device -800Pa. Close the shut-off valve 4. Observe the U-shaped pressure gauge 22; the pressure rise should be ≤100Pa after 30 seconds. After the test, keep the shut-off valve 4 in the closed state.

[0025] When testing the positive pressure airtightness of the compressed oxygen self-rescue device's breathing system, remove the exhaust valve from the device and reinstall it in reverse, or seal the exhaust valve port with a plug. Pull out the low-pressure switching valve 2 to the positive pressure end, open the shut-off valve 4, turn on the power switch of the air pump 1, and set the pressure inside the self-rescue device's breathing system to 980 Pa. Close the shut-off valve 4. Observe the U-tube manometer 22; the pressure drop should be ≤50 Pa after 1 minute.

[0026] When testing the negative pressure airtightness of the compressed oxygen self-rescue device's breathing system, remove the exhaust valve from the self-rescue device and insert it into the exhaust valve port in the correct direction, or seal the exhaust valve port with a plug. Press the low-pressure switching valve 2 to the negative pressure end, open the shut-off valve 4, and turn on the power switch of the air pump 1 to make the pressure in the self-rescue device's breathing system -784Pa. Close the shut-off valve 4. Observe the U-tube manometer 22; the pressure rise should be ≤50Pa after 1 minute. After the test, keep the shut-off valve 4 in the closed position.

[0027] A self-rescue device comprehensive performance verification instrument includes a third interface 6. The third interface 6 is sequentially connected to a first reversing valve 7, a third flow meter 21, a second reversing valve 8, and a third reversing valve 9. The third reversing valve 9 is connected to a constant volume chamber 20. Through this pathway, the oxygen supply performance of the compressed oxygen self-rescue device in a quantitative oxygen supply mode can be verified. In a specific embodiment, the first reversing valve 7 can be selectively connected to the third interface 6 or the low-pressure switching valve 2. The third reversing valve 9 can be selectively connected to the constant volume chamber 20 or the atmosphere. The second reversing valve 8 can be selectively connected to the third reversing valve 9 or the fifth interface 11.

[0028] When testing the oxygen supply performance of a compressed oxygen self-rescue device in quantitative oxygen supply mode, detach the self-rescue device's airbag from the pressure reducer. Connect one end of the flow adapter to the pressure reducer body in a sealed manner, and connect the other end to the instrument interface via a hose. Connect the quantitative oxygen supply tube to the third interface 6, press the first reversing valve 7, and fully open the valve on the third flow meter 21. With pressures in the high-pressure system at 20 MPa-18 MPa and 5 MPa-3 MPa, read the third flow meter 21. Record that the quantitative oxygen supply should not be less than 2.1 L / min at a breathing rate of 35 L / min and not less than 0.5 L / min at a breathing rate of 10 L / min. After the test, keep the first reversing valve 7 pressed.

[0029] A self-rescue device comprehensive performance verification instrument includes a fourth interface 10. The fourth interface 10 is connected to a second flow meter 19. The other end of the second flow meter 19 is connected to the atmosphere. Through this pathway, the oxygen supply performance of the compressed oxygen self-rescue device can be verified in both automatic and manual oxygen supply modes.

[0030] When testing the oxygen supply performance of the compressed oxygen self-rescuer in automatic oxygen supply mode, connect the automatic oxygen supply pipe to the fourth port 10 and fully open the valve on the second flow meter 19. When the pressure in the high-pressure system is 20MPa-18MPa and 5MPa-3MPa, activate the automatic supply valve, read the second flow meter 19, and measure its automatic supply rate, which should be no less than 65L / min.

[0031] When testing the oxygen supply performance of the compressed oxygen self-rescuer in manual oxygen supply mode, connect the manual oxygen supply pipe to the fourth port 10 and fully open the valve on the second flow meter 19. When the pressure in the high-pressure system is 20MPa-18MPa and 5MPa-3MPa, activate the manual supply valve and read the second flow meter 19 to measure the manual oxygen supply rate, which should be no less than 65L / min.

[0032] A self-rescue device comprehensive performance calibration instrument includes a fifth interface 11. The fifth interface 11 is sequentially connected to a first flow meter 14, a precision pressure reducer 15, a low-pressure air source valve 16, and a low-pressure air source 17. A low-pressure air source pressure gauge 18 is installed between the first flow meter 14 and the precision pressure reducer 15. Through this pathway, the ventilation resistance of the exhalation valve and inhalation valve can be tested.

[0033] When the exhalation valve's ventilation resistance needs to be tested, connect the exhalation valve to the fifth interface 11 via the tooling. Turn the precision pressure reducer 15 left to its loosest position, open the low-pressure air source valve 16, and slowly turn the precision pressure reducer 15 right to adjust the pressure to a suitable level ≤0.2MPa. Adjust the valve on the first flow meter 14 to make the incoming flow rate 30L / min. After the low-pressure air source pressure gauge 18 stabilizes, the value read is the internal resistance H0 of the exhalation valve during the ventilation resistance test.

[0034] When the inhalation valve's ventilation resistance needs to be tested, connect the inhalation valve to the fifth interface 11 via the tooling. Read the value of the low-pressure gas source pressure gauge 18 as the internal resistance X0 of the exhalation valve during the ventilation resistance test.

[0035] Turn the precision pressure regulator 15 left to its loosest position, open the low-pressure air source valve 16, and slowly turn the precision pressure regulator 15 right to adjust the pressure to a suitable level ≤0.2MPa. Adjust the valve on the first flow meter 14 to make the incoming flow rate 30L / min 1.8m³. 3 After the low-pressure gas source pressure gauge 18 stabilizes, read the overall resistance value Z. The ventilation resistance value H of the exhalation valve is calculated as Z - H0, and the ventilation resistance value X of the inhalation valve is calculated as Z - X0. This method eliminates the interference of the pipeline's own resistance on the test results, further improving the accuracy of the data.

[0036] The fifth interface 11 is also connected in sequence to the second reversing valve 8, the third flow meter 21, the first reversing valve 7, and the low-pressure switching valve 2. The fifth interface 11 is also connected to the exhaust valve 12 and the pressure gauge 13. The second interface 5 is connected in sequence to the U-shaped pressure gauge 22, the constant volume chamber 20, the third reversing valve 9, the second reversing valve 8, the third flow meter 21, the first reversing valve 7, and the low-pressure switching valve 2. Through the above path, combined with the path formed by the second reversing valve 8, the third flow meter 21, the first reversing valve 7, and the low-pressure switching valve 2, reverse leakage testing of the exhalation and inhalation valves can be achieved.

[0037] When the reverse leakage of the exhalation valve needs to be tested, connect the exhalation valve to the fifth port 11 and the wet gas flow meter through the tool. When the reverse leakage of the inhalation valve needs to be tested, connect the inhalation valve to the connecting pipe of the fifth port 11 and the wet gas flow meter through the tool.

[0038] Pull out the low-pressure switching valve 2 to the positive pressure end, pull out the second reversing valve 8 and the first reversing valve 7 to the leakage test, fully open the exhaust valve 12, turn on the power switch of the air pump 1, and adjust the valve on the third flow meter 21 to make the incoming flow a stable airflow of 1.2 L / min. Record the initial value m of the wet gas flow meter. Slowly close the exhaust valve 12, observe the pressure gauge 13, and keep the air pressure at about 1000 Pa. Measure the amount of gas leaking into the wet gas flow meter in 1 minute. Record the final value n of the wet gas flow meter. Reverse leakage l = nm.

[0039] After the test is completed, keep the first reversing valve 7, the second reversing valve 8, and the third reversing valve 9 in the pressed state, and completely close the exhaust valve 12.

[0040] When the second interface 5, U-shaped pressure gauge 22, constant volume chamber 20, third reversing valve 9, second reversing valve 8, third flow meter 21, first reversing valve 7 and low pressure switching valve 2 are connected, a test path for the opening pressure of the exhaust valve and the reverse air tightness can be formed.

[0041] When the pressure test of the exhaust valve is required, connect the exhaust valve to the second interface 5 via the tooling. Pull out the low-pressure switching valve 2 to the positive pressure end, close the shut-off valve 4, pull out the first reversing valve 7 and the third reversing valve 9, press the second reversing valve 8, fully open the valve on the third flow meter 21, turn on the air pump 1, adjust the valve on the third flow meter 21 to make the incoming flow rate 1.5L / min, observe the exhaust valve when it is venting, and read the value of the U-tube manometer 22. After the test is completed, keep the first reversing valve 7, the second reversing valve 8, and the third reversing valve 9 in the pressed state.

[0042] When a reverse airtightness test of the exhaust valve is required, the connection remains unchanged as above. Press the low-pressure switching valve 2 to the negative pressure end, close the shut-off valve 4, pull out the first reversing valve 7 and the third reversing valve 9, press the second reversing valve 8, fully close the valve on the third flow meter 21, turn on the air pump 1, slowly open the valve on the third flow meter 21, observe the value of the U-tube manometer 22, when the pressure reaches 1000Pa, pull out the second reversing valve 8, and simultaneously turn off the air pump 1, record the pressure drop value within 1 minute. After the test, keep the first reversing valve 7, the second reversing valve 8, and the third reversing valve 9 in the pressed state.

[0043] A self-rescue device comprehensive performance calibration instrument includes a first interface 3. The first interface 3 is connected to a low-pressure switching valve 2. Through the above path, the airtightness test of the gas storage bag and the effective volume measurement can be realized.

[0044] When the airtightness of the gas bag needs to be tested, the second interface 5 is sealed to the breathing port of the self-rescuer. The first interface 3 is connected to a wet gas flow meter, and the initial value x of the wet gas flow meter is recorded. The exhaust valve installation port of the self-rescuer is sealed with a plug. Pull out the low-pressure switching valve 2 to the positive pressure end, open the shut-off valve 4, and turn on the air pump 1 to inflate the gas bag. When the gas bag is almost full, slowly adjust the shut-off valve 4 to reduce the air intake. When the value of the U-shaped pressure gauge 22 reaches 1000Pa, close the shut-off valve 4 and the air pump 1. If the pressure drop is ≤50Pa within 1 minute, or immerse the gas bag in water to check for leaks.

[0045] When the effective volume of the gas storage bag needs to be measured, following the previous test, press the low-pressure switching valve 2 to the negative pressure end, open the shut-off valve 4, and turn on the air pump 1 to evacuate air. The gas storage bag will shrink until it is deflated. Observe the U-shaped pressure gauge 22 when the negative pressure rises, then close the air pump 1 and the shut-off valve 4. Record the end value y of the wet gas flow meter. Effective volume z = yx.

[0046] The piping structure, interface type, and connection relationship of the conventional components of the self-rescue device described above are all common knowledge or existing technology in this field. Those skilled in the art can achieve the corresponding air circuit connections and conduction based on the description in this embodiment and in conjunction with common knowledge.

[0047] Furthermore, to address the issue that temperature fluctuations can cause pressure changes within the constant-volume chamber 20, resulting in false flow rates and thus affecting detection accuracy, the built-in correction mechanism 204 of the constant-volume chamber 20 can automatically adjust the internal volume using the thermal expansion and contraction characteristics of the bimetallic strip.

[0048] like Figure 2 , 3 As shown, the specific structure of the constant-volume cavity 20 includes a cylindrical body 202, which is provided with an interface. A first end 201 is detachably disposed at the upper end of the cylindrical body 202 and is also provided with an interface. A second end 203 is detachably disposed at the lower end of the cylindrical body 202. By replacing the cylindrical body 202 with different lengths, the volume of the constant-volume cavity 20 can be changed, thereby meeting different inspection requirements.

[0049] like Figure 4 As shown, a straightening mechanism 204 is provided inside the cylinder 202. The specific structure of the straightening mechanism 204 includes a bimetallic strip 2041, which is vortex-shaped and its outer end is fixedly connected to the cylinder 202. The bimetallic strip 2041 is made of two alloys with different coefficients of thermal expansion, which produce significant bending deformation when the temperature changes.

[0050] Nut 2042 is fixedly mounted on the inner end of bimetallic strip 2041. Nut 2042 is rotatably mounted inside cylinder 202 via a bracket (not shown in the figure). The central axis of nut 2042 coincides with the central axis of cylinder 202. Nut 2042 acts as a power converter, transmitting the torque generated by temperature deformation of bimetallic strip 2041.

[0051] The lifting plate 2044 is vertically and flexibly disposed within the cylinder 202. To guide the lifting plate 2044 to move axially along the cylinder 202, a guide mechanism (not shown in the figure) is provided between the lifting plate 2044 and the cylinder 202. A lead screw 2043 is fixedly disposed at the upper end of the lifting plate 2044 and is drively connected to the nut 2042. When the nut 2042 rotates with the bimetallic strip 2041, the lead screw 2043 drives the lifting plate 2044 to move vertically along the axial direction of the cylinder 202.

[0052] The lifting plate 2044 is equipped with an airbag 2045, which is sealed to the cylinder 202. A chamber is formed below the airbag 2045. The chamber is sealed to the inner cavity of the constant volume chamber 20, but is open to the atmosphere.

[0053] When the gas temperature inside the cylinder 202 changes, such as a drop in temperature, the bimetallic strip 2041 senses the temperature change and generates stress. Due to the large deformation stroke of the vortex structure, the inner end of the bimetallic strip 2041 will undergo angular displacement, causing the nut 2042 to rotate synchronously. With the cooperation of the lead screw 2043 and the nut 2042, the rotational motion is converted into linear motion, driving the lifting plate 2044 to move upward, thereby reducing the volume of the constant-volume cavity 20. In this way, by adjusting the volume of the constant-volume cavity 20, the pressure fluctuations caused by the thermal expansion and contraction of the gas are offset, avoiding measurement errors caused by the heat release during gas compression during inflation and the temperature drop during the pressure holding stage. Furthermore, because the lead screw 2043 and the nut 2042 have a self-locking characteristic, pressure changes inside the constant-volume cavity 20 caused by non-temperature changes such as self-rescue device leakage will not change the volume of the constant-volume cavity 20, thus ensuring the stability and accuracy of the detection data.

[0054] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A self-rescue device comprehensive performance verification instrument, characterized in that, include: Second interface (5); The air pump (1) is connected in sequence to a low-pressure switching valve (2), a shut-off valve (4), a second interface (5), a U-shaped pressure gauge (22), and a constant volume chamber (20).

2. The self-rescue device comprehensive performance verification instrument according to claim 1, characterized in that, include: Third interface (6); The third interface (6) is connected in sequence to the first reversing valve (7), the third flow meter (21), the second reversing valve (8) and the third reversing valve (9). The third reversing valve (9) is connected to the constant volume chamber (20).

3. The self-rescue device comprehensive performance verification instrument according to claim 2, characterized in that, include: Fourth interface (10); The fourth interface (10) is connected to a second flow meter (19).

4. The self-rescue device comprehensive performance verification instrument according to claim 3, characterized in that, include: Fifth interface (11); The fifth interface (11) is connected in sequence to the first flow meter (14), the precision pressure reducer (15), the low-pressure gas source valve (16) and the low-pressure gas source (17). A low-pressure gas source pressure gauge (18) is provided between the first flow meter (14) and the precision pressure reducer (15).

5. A self-rescue device comprehensive performance verification instrument according to claim 4, characterized in that, The fifth interface (11) is also connected in sequence to the second reversing valve (8), the third flow meter (21), the first reversing valve (7) and the low-pressure switching valve (2). The fifth interface (11) is also connected to an exhaust valve (12) and a pressure gauge (13).

6. A self-rescue device comprehensive performance verification instrument according to claim 5, characterized in that, The second interface (5) is connected in sequence to the U-shaped pressure gauge (22), the constant volume chamber (20), the third reversing valve (9), the second reversing valve (8), the third flow meter (21), the first reversing valve (7) and the low pressure switching valve (2).

7. The self-rescue device comprehensive performance verification instrument according to claim 1, characterized in that, include: First interface (3); The first interface (3) is connected to the low-pressure switching valve (2).

8. A self-rescue device comprehensive performance verification instrument according to claim 1, characterized in that, The constant-volume cavity (20) includes: The cylindrical body (202) is provided with an interface; The first end (201) is detachably disposed at the upper end of the cylinder (202) and is provided with an interface; The second end (203) is detachably disposed at the lower end of the cylinder (202).

9. A self-rescue device comprehensive performance verification instrument according to claim 8, characterized in that, A correction mechanism (204) is provided inside the cylinder (202), and the correction mechanism (204) includes: The bimetallic strip (2041) is vortex-shaped and its outer end is fixedly connected to the cylinder (202); Nut (2042) is fixedly disposed at the inner end of the bimetallic strip (2041); The lifting plate (2044) is vertically and vertically installed inside the cylinder (202); The lead screw (2043) is located at the upper end of the lifting plate (2044) and is connected to the nut (2042) for transmission.

10. A self-rescue device comprehensive performance verification instrument according to claim 8, characterized in that, The lifting plate (2044) is equipped with an airbag (2045), which is sealed to the cylinder (202).

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