Device for detecting air tightness of flexible material under high temperature and high pressure

Abstract

The invention discloses a flexible material airtightness detection device under high temperature and high pressure, and belongs to the technical field of airtightness detection.The flexible material airtightness detection device comprises a high-temperature and high-pressure cavity, a material airtightness detection module is installed in the center of a flange cover of the high-temperature and high-pressure cavity in a sealed mode, and the material airtightness detection module is connected with a leaked gas recovery detection module; the system further comprises a temperature and pressure control analysis system which is used for controlling the temperature and pressure of the high-temperature and high-pressure cavity and receiving pressure real-time data and temperature real-time data of the high-temperature and high-pressure cavity and leakage real-time data of the material airtightness detection module for analysis and calculation. According to the invention, air tightness detection can be carried out on the material under the simulated real working condition, so that rapid evaluation and screening of the air tightness performance of different materials under the extreme working condition can be realized.

Description

Technical Field

[0001] The invention relates to an air tightness detection device for flexible materials under high temperature and high pressure, belonging to the technical field of air tightness detection. Background Art

[0002] With the development of new energy technologies, compressed air energy storage (CAES) has attracted widespread attention as a clean and efficient energy storage method. In underground energy storage facilities, the reliability of the sealing structure directly impacts safety and energy efficiency. Especially under high-temperature and high-pressure cycling conditions, sealing materials such as elastomers, composite diaphragms, and metals within the facility are prone to aging, deformation, or micro-leakage, affecting the stable operation of the entire system.

[0003] Existing material sealing performance tests are mostly conducted at room temperature and pressure, which makes it difficult to truly simulate actual working environments. Some high-temperature or high-pressure testing devices suffer from complex structures, discontinuous testing processes, and poor repeatability of results. Therefore, there is an urgent need for a dedicated device and method that can test material airtightness under simulated working conditions, enabling rapid evaluation and screening of the airtightness performance of different materials under extreme working conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing technology and provide an airtightness detection device for flexible materials under high temperature and high pressure, which can perform airtightness detection on materials under simulated real working conditions, so as to realize rapid evaluation and screening of the airtightness performance of different materials under extreme working conditions.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A device for detecting air tightness of flexible materials under high temperature and high pressure, comprising a high temperature and high pressure cavity, wherein a material air tightness detection module is installed on the center seal of the flange cover of the high temperature and high pressure cavity, wherein the material air tightness detection module is connected to a leakage gas recovery detection module, and further comprising a temperature and pressure control and analysis system, wherein the temperature and pressure control and analysis system is used to control the temperature and pressure of the high temperature and high pressure cavity, and receives real-time pressure data and temperature data of the high temperature and high pressure cavity, as well as real-time leakage data of the material air tightness detection module for analysis and calculation.

[0007] The high-temperature and high-pressure cavity includes a pressure vessel, which is provided with an air booster pump interface, a hydraulic valve interface, a thermal resistor interface, and a pressure gauge and pressure transmitter interface. The air booster pump interface, hydraulic valve interface, thermal resistor interface, and pressure gauge and pressure transmitter interface are respectively installed with an air booster pump, a hydraulic valve, a thermal resistor, and a pressure transmitter. The outside of the pressure vessel is wrapped with an electric heating jacket, and the end of the pressure vessel is provided with a flange cover connecting shaft.

[0008] The pressure vessel is provided with a reserved interface.

[0009] A container support is provided on the side of the pressure container.

[0010] The material air tightness detection module includes a flange cover, which is fixed to the high-temperature and high-pressure cavity by the flange cover connecting shaft, a step-shaped cavity is opened in the flange cover, a leakage plate is provided on the side of the step-shaped cavity close to the high-temperature and high-pressure cavity, and a gas collecting hood is provided on the side of the step-shaped cavity away from the high-temperature and high-pressure cavity, the leakage plate is sealed to the gas collecting hood, the gas collecting hood is connected to the air inlet end of the thermal flow meter, and the air outlet end of the thermal flow meter is connected to the leakage gas recovery detection module, the material air tightness detection module also includes a gasket, which is installed in the annular groove at the end of the pressure vessel, and a test sample is provided between the gasket and the leakage plate.

[0011] The gas collecting hood and the thermal flow meter are connected via a rectifier tube.

[0012] The leakage gas recovery detection module includes a heat dissipation copper tube, a copper tube bracket is connected to the heat dissipation copper tube, one end of the heat dissipation copper tube is connected to the material air tightness detection module, and the other end of the heat dissipation copper tube is connected to the upper side of the drainage gas collecting barrel shell. A drainage piston is provided in the drainage gas collecting barrel shell, and the lower side of the drainage gas collecting barrel shell is connected to the water inlet and drainage pipe.

[0013] The heat dissipation copper tubes are arranged in a spiral shape.

[0014] The signal input end of the temperature and pressure control and analysis system is electrically connected to the pressure transmitter, the thermal resistor and the thermal flow meter, and the signal input end of the temperature and pressure control and analysis system is electrically connected to the air booster pump, the electric heating jacket and the pressure relief valve.

[0015] The leakage plate is provided with a groove, and the gas collecting hood is clamped in the groove.

[0016] Beneficial effects of the present invention: The present invention provides a device for detecting air tightness of flexible materials under high temperature and high pressure. The device relies on a specially designed high temperature and high pressure pressure vessel. By setting the air pressure and temperature parameters, a controllable and adjustable test environment is constructed. Combined with a replaceable high-precision material air tightness detection module, the device can perform air tightness detection on the material under simulated real working conditions, and realize real-time observation and comprehensive evaluation of the air tightness performance of the sample under extreme working conditions. In addition, the device has the characteristics of compact structure, easy operation, good repeatability and strong adaptability, and can be widely used in the research and development and verification of compressed air energy storage systems and other high temperature and high pressure sealing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall structural diagram of a device for detecting air tightness of flexible materials under high temperature and high pressure according to the present invention.

[0018] Figure 2 Schematic diagram of the structure of the high temperature and high pressure cavity in the present invention;

[0019] Figure 3 This is a schematic diagram of the connection between the electric heating jacket and the flange cover and the high-temperature and high-pressure cavity in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the material air tightness detection module in the present invention;

[0021] Figure 5 This is a connection diagram of the thermal flow meter in the present invention;

[0022] Figure 6 Schematic diagram of the structure of the leaked gas recovery and detection module in the present invention;

[0023] Figure 7 This is a schematic diagram of the internal structure of the drainage and gas collecting barrel shell in the present invention;

[0024] Figure 8 It is a flow chart of the working process of the present invention;

[0025] The reference numerals in the figure are as follows: 11-high temperature and high pressure cavity; 21-material air tightness detection module; 31-leakage gas recovery detection module; 111-pressure vessel; 112-air booster pump interface; 113-hydraulic valve interface; 114-thermal resistor interface; 115-pressure gauge and pressure transmitter interface; 116-reserved interface; 117-container bracket; 118-electric heating jacket; 119-flange cover connecting shaft; 211-flange cover; 212-gasket; 213-test specimen; 214-leakage plate; 215-gas collecting hood; 216-rectifier tube; 311-heat dissipation copper tube; 312-copper tube bracket; 313-water inlet and drain pipe; 314-drainage gas collecting barrel shell; 315-drainage piston. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1As shown, the present invention discloses a device for testing air tightness of flexible materials under high temperature and high pressure, including a high temperature and high pressure cavity 11, which is a horizontal pressure vessel. A material air tightness testing module 21 is installed in the center seal of the flange cover of the high temperature and high pressure cavity 11, and the material air tightness testing module 21 is fastened to the high temperature and high pressure cavity 11 by a connecting shaft and a flange. The material air tightness testing module 21 is connected to a leakage gas recovery testing module 31, and the leakage gas recovery testing module 31 is fastened to the air tightness testing module 21 by a threaded connection. The present invention also includes a temperature and pressure control and analysis system, which is connected to each sensor element of the device through a data transmission line. The temperature and pressure control and analysis system is used to control the temperature and pressure of the high temperature and high pressure cavity 11, and receives real-time pressure data and temperature data of the high temperature and high pressure cavity 11, as well as real-time leakage data of the material air tightness testing module 21 for analysis and calculation.

[0029] The tightness detection device of the present invention relies on a specially designed high-temperature and high-pressure pressure vessel. By setting the air pressure and temperature parameters, a controllable and adjustable test environment is constructed. Combined with a replaceable high-precision material airtightness detection module, it can perform airtightness detection on materials under simulated real working conditions, and realize real-time observation and comprehensive evaluation of the airtightness performance of samples under extreme working conditions.

[0030] Example 2

[0031] like Figure 1 As shown, the present invention discloses a device for testing air tightness of flexible materials under high temperature and high pressure, including a high temperature and high pressure cavity 11, which is a horizontal pressure vessel. A material air tightness testing module 21 is installed in the center seal of the flange cover of the high temperature and high pressure cavity 11, and the material air tightness testing module 21 is fastened to the high temperature and high pressure cavity 11 by a connecting shaft and a flange. The material air tightness testing module 21 is connected to a leakage gas recovery testing module 31, and the leakage gas recovery testing module 31 is fastened to the air tightness testing module 21 by a threaded connection. The present invention also includes a temperature and pressure control and analysis system, which is connected to each sensor element of the device through a data transmission line. The temperature and pressure control and analysis system is used to control the temperature and pressure of the high temperature and high pressure cavity 11, and receives real-time pressure data and temperature data of the high temperature and high pressure cavity 11, as well as real-time leakage data of the material air tightness testing module 21 for analysis and calculation.

[0032] like Figure 2 and Figure 3As shown, the high-temperature and high-pressure chamber 11 includes a pressure vessel 111, which has a hemispherical head at one end and a flange at the other end. The pressure vessel 111 is provided with an air booster pump interface 112, a hydraulic valve interface 113, a thermal resistor interface 114, and a pressure gauge and pressure transmitter interface 115. In order to facilitate the replacement of different types of supporting equipment during later use, all are connected to the corresponding equipment using flanges. Among them, the thermal resistor interface 114 and the force transmitter interface 115 require threaded holes to be opened on the flange cover for easy installation. The air booster pump interface 112, the hydraulic valve interface 113, the thermal resistor interface 114, and the pressure gauge and pressure transmitter interface 115 are respectively installed with an air booster pump, a hydraulic valve, a thermal resistor, a pressure gauge, and a pressure transmitter. The pressure gauge and pressure transmitter are connected to an external interface via a flange double-thread conversion interface, where the pressure gauge facilitates real-time observation to ensure safety.

[0033] Thermistors are used to measure the temperature of the gas environment inside a pressure vessel and have the advantages of high temperature measurement accuracy and good stability. Thermistors are connected to the temperature control module via wires to form a closed-loop temperature control system, which is used to adjust the heating power of the electric heating jacket to achieve precise control of the temperature inside the container. The gas booster pump is used to inject the source gas into the pressure vessel after multi-stage pressurization, gradually increasing the gas pressure inside the container. The gas booster pump is preferably a pneumatic piston pump or an electric booster pump, which, in conjunction with a solenoid valve and a pressure regulator, can achieve automatic pressure stabilization control of the gas pressure. The pressure relief valve is used to automatically open and release excess gas when the pressure inside the container exceeds the preset safety value to prevent the system from operating under overpressure. The pressure relief valve can be a spring-loaded safety valve or an automatically controlled electromagnetic pressure relief valve with high response speed and repeated opening and closing reliability to ensure the safety of the testing process.

[0034] The pressure vessel 111 is provided with a reserved interface 116, which is sealed with a flange cover. A container bracket 117 is provided on the side of the pressure vessel 111, and the container bracket 117 is connected to the pressure vessel 111 by welding. A total of four container brackets 117 are provided to ensure that the flange end of the pressure vessel 11 is suspended in the air and the inner chamber of the pressure vessel is horizontal. The outside of the pressure vessel 111 is wrapped with an electric heating jacket 118 for heating. The electric heating jacket is composed of an electric heating tape, a stainless steel metal sheet, and a glass wool insulation layer. It covers the entire outer surface of the pressure vessel, ensuring the airtightness of the interior of the container while reducing the heat loss of the pressure vessel. A flange cover connecting shaft 119 is provided at the end of the pressure vessel 111. The flange cover connecting shaft 119 is a large bolt and nut used to connect the container and the flange cover.

[0035] like Figure 4 and Figure 5As shown, the material airtightness testing module 21 is installed at the center of the flange cover 211 of the pressure vessel 111. The module 21 includes the flange cover 211, which is secured to the high-temperature, high-pressure chamber 11 via the flange cover connecting shaft 119. The flange cover 211 features a central opening and defines a stepped cavity. The diameter of the inner half of the opening equals the inner diameter of the pressure vessel 111, while the diameter of the outer half equals two-thirds of the inner diameter. A leakage plate 214 is located within the stepped cavity, with test holes defined in it. The diameter of the leakage plate 214 equals the inner diameter of the pressure vessel 111, and its thickness equals half the thickness of the flange cover 211. The area with a central diameter equal to two-thirds of the inner diameter of the pressure vessel 111 serves as the test hole area. Holes of varying sizes, numbers, spacing, and shapes can be added to this area to meet testing requirements. Gas collection hoods 215 are provided inside and outside the stepped cavity. Gas collection hoods 215 are cylindrical, thin-walled structures with no cylindrical bottom at one end and a truncated cone with a diameter of 20-30 mm and a length of 50 mm at the center of the cone at the other end. A hole with an inner diameter of 15-25 mm is provided in the center of the cone, extending into the interior of the cylindrical chamber. The outer diameter of gas collection hood 215 is two-thirds the inner wall of the pressure vessel. The overall length of the cylinder is 2 mm longer than half the length of flange cover 211. The wall thickness is 2 mm, and the outer wall surface is threaded for easy threaded connection with flange cover 211. Leakage plate 214 has a groove with a width of 2 mm and a depth of 2 mm on the outer side of the plate, corresponding to two-thirds of the inner diameter of pressure vessel 111, extending toward the center. Gas collection hood 215 is snapped into the groove, improving the sealing performance during the gas collection process and reducing test errors. Leakage plate 214 is sealed to gas collection hood 215. The gas collection hood 215 is connected to the air inlet of the thermal flowmeter 217, and the air outlet of the thermal flowmeter 217 is connected to the leaked gas recovery and detection module 31. The thermal flowmeter 217 is used to measure the gas flow through the diaphragm sample. It is preferably a thermal mass flowmeter, which can achieve high-precision, low-flow gas flow detection, and thus quantitatively evaluate the material's airtightness performance. The material airtightness detection module 21 also includes a gasket 212. The gasket 212 is installed in the annular groove at the end of the pressure vessel 111. A test sample 213 is provided between the gasket 212 and the leakage plate 214. The size of the test sample 213 should be 8 to 10 mm larger than the inner diameter of the pressure vessel 111, and the thickness should be between 1 and 12 mm. For thinner samples, an annular gasket 212 is used to supplement the thickness of the sample clamping edge.

[0036] To facilitate testing materials of varying thicknesses and studying the differences in leakage caused by different leak holes and leak areas, this module's materials are removable and replaceable. Specifically, gaskets 212 of varying thicknesses can be used to securely seal test specimens 213, depending on the thickness of the test specimens. Furthermore, the leakage plate 214 is replaceable, with various opening sizes.

[0037] In order to improve the accuracy of the test results of the thermal flow meter 217 and prevent the influence of unstable airflow, a rectifier tube 216 is added between the thermal flow meter 217 and the gas collecting cover 215, and is also fastened with threads.

[0038] like Figure 6 and Figure 7 As shown, to ensure more accurate test results, the device uses the drainage collection method to design a leaked gas recovery and detection module 31. This module 31 includes a heat dissipation copper tube 311, which is spirally mounted on a copper tube support 312. This minimizes footprint, cools the high-temperature gas, facilitates testing, and reduces errors caused by thermal expansion and contraction. The inner diameter of the heat dissipation copper tube 311 is 15-25 mm, the outer diameter is 20-30 mm, and the length is between 6 and 12 meters. One end of the heat dissipation copper tube 311 is connected to the material airtightness detection module 21. The other end of the heat dissipation copper tube 311 is connected to the upper side of the drainage gas collection barrel housing 314. A drainage piston 315 is installed within the drainage gas collection barrel housing 314, and the lower side of the drainage gas collection barrel housing 314 is connected to the water inlet drain pipe 313. Both the heat dissipation copper tube 311 and the water inlet drain pipe 313 are threadedly fastened to the drainage gas collection barrel housing 314. The piston collects gas on the top and water is injected into the bottom through the water inlet and outlet pipe 313. When the gas increases, the piston moves downward to discharge the gas. A water scale line is provided on the outer surface of the drainage and gas collecting barrel shell 314 to facilitate the calculation of the water volume and thus obtain the gas leakage amount.

[0039] In the present invention, the signal input end of the temperature and pressure control and analysis system is electrically connected to the pressure transmitter, the thermal resistor, and the thermal flowmeter. The signal input end of the temperature and pressure control and analysis system is also electrically connected to the air booster pump, the electric heating jacket, and the pressure relief valve. The temperature and pressure control and analysis system includes a PLC controller, an alarm system, a data acquisition module, a data analysis module, a control interface, and an operation terminal. The pressure transmitter is used to measure the pressure within the high-temperature and high-pressure cavity 11 in real time and transmit the pressure signal to the PLC controller; the thermal resistor is used to measure the temperature within the high-temperature and high-pressure cavity 11 and transmit the temperature signal to the PLC controller; the gas booster pump is used to increase the pressure within the high-temperature and high-pressure cavity 11, and its operating state is controlled by the PLC controller; the electric heating jacket is used to heat the high-temperature and high-pressure cavity 11, and its operating state is controlled by the PLC controller; the pressure relief valve is used to automatically relieve pressure when the pressure exceeds the safety threshold, and its operating state is controlled by the PLC controller.

[0040] The data acquisition module is used to collect data from sensors such as pressure transmitters, thermal resistors, thermal flow meters, etc., and transmit it to the PLC controller; the data analysis module is used to analyze and process the collected data; the control interface and operation terminal are used for users to input control instructions and display the system operation status and test results; the alarm system is used to issue an alarm when the temperature or pressure exceeds the safe range, and to work with the PLC controller to trigger the safety protection mechanism.

[0041] Specifically, the PLC controller, serving as the system's logical control core, collects signals such as pressure, temperature, and flow, and issues control commands to the electric heating, gas pressurization, and pressure relief components, enabling automatic regulation and coordinated control of temperature and pressure. The PLC controller can be pre-programmed to control multi-stage heating and pressurization processes, and includes a communication interface and remote operation capabilities.

[0042] The alarm system includes audible and visual alarms, as well as over-limit indicators, to generate alarm signals when temperature or pressure exceeds safety set points. Linked to the PLC, the alarm system can automatically shut down the machine, shut off valves, or lock data records, enhancing the system's fault response capabilities and operational safety.

[0043] The data acquisition module is used to collect real-time temperature, pressure, flow rate and other parameter signals during system operation and convert them into digital signals that can be recognized and analyzed by the PLC. The module includes multiple signal acquisition channels and has data buffering and abnormal data identification functions.

[0044] The data analysis module is connected to the data acquisition module and PLC controller to plot curves, identify anomalies, and calculate and store sealing performance data collected during the test. The data analysis module can be connected to the host computer software, touch terminal, or remote monitoring system to realize data processing and analysis output throughout the test process.

[0045] The present invention monitors the relationship between the numerical changes of pressure transmitters and thermal resistors and their set values to control the shutdown and activation of the air booster pump and electric heating jacket. When the measured value reaches the device's safety threshold, all equipment is shut down and the pressure relief valve is activated. Simultaneously, real-time data from the thermal flowmeter, pressure transmitter, and thermal resistor is output, fitted, analyzed, and calculated, and the results are output.

[0046] like Figure 8 As shown, the present invention also discloses a method for using a material air tightness detection device under high temperature and high pressure, and the specific operating steps are as follows:

[0047] Step 1: Connect the power supply, place the sample to be tested in the test area, replace the leakage plate with the specifications required for the test, fill the drainage bucket with water, and check whether the entire equipment is installed in place.

[0048] Step 2: Start the temperature and pressure control analysis system and connect the system to the gas booster pump, electric heating jacket, pressure relief valve and various sensors.

[0049] Step three: Set the ambient air pressure and temperature for the material to be tested, as well as the test termination conditions, including time and leakage volume. The air pressure should be between normal atmospheric pressure and 25 MPa, and the temperature should be between room temperature and 250°C. Set a safety threshold. When the air pressure exceeds 30 MPa, activate the pressure relief valve.

[0050] Step 4: Output the test results.

[0051] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for detecting air tightness of flexible materials under high temperature and high pressure, characterized by: The invention comprises a high-temperature and high-pressure cavity (11), wherein a material airtightness detection module (21) is installed in the center seal of the flange cover of the high-temperature and high-pressure cavity (11), and the material airtightness detection module (21) is connected to a leakage gas recovery detection module (31). The invention also comprises a temperature and pressure control analysis system, wherein the temperature and pressure control analysis system is used to control the temperature and pressure of the high-temperature and high-pressure cavity (11), and receives the real-time pressure data and temperature data of the high-temperature and high-pressure cavity (11), as well as the real-time leakage data of the material airtightness detection module (21) for analysis and calculation.

2. The device for detecting air tightness of flexible materials under high temperature and high pressure according to claim 1, characterized in that: The high-temperature and high-pressure cavity (11) includes a pressure vessel (111), and the pressure vessel (111) is provided with an air booster pump interface (112), a hydraulic valve interface (113), a thermal resistor interface (114), and a pressure gauge and pressure transmitter interface (115). The air booster pump interface (112), the hydraulic valve interface (113), the thermal resistor interface (114), and the pressure gauge and pressure transmitter interface (115) are respectively installed with an air booster pump, a hydraulic valve, a thermal resistor, and a pressure transmitter. The pressure vessel (111) is wrapped with an electric heating jacket (118), and the end of the pressure vessel (111) is provided with a flange cover connecting shaft (119).

3. The air tightness detection device for flexible materials under high temperature and high pressure according to claim 2, characterized in that: A reserved interface (116) is provided on the pressure container (111).

4. The device for testing air tightness of flexible materials under high temperature and high pressure according to claim 2, characterized in that: A container support (117) is provided on the side of the pressure container (111).

5. The device for testing air tightness of flexible materials under high temperature and high pressure according to claim 2, characterized in that: The material air tightness detection module (21) includes a flange cover (211), the flange cover (211) and the high-temperature and high-pressure cavity (11) are fixed via the flange cover connecting shaft (119), a step-shaped cavity is provided in the flange cover (211), a leakage plate (214) is provided on a side of the step-shaped cavity close to the high-temperature and high-pressure cavity (11), and a gas collecting cover (215) is provided on a side of the step-shaped cavity away from the high-temperature and high-pressure cavity (11). ) is sealedly connected to the gas collecting hood (215), the gas collecting hood (215) is connected to the air inlet end of the thermal flow meter (217), the air outlet end of the thermal flow meter (217) is connected to the leaked gas recovery detection module (31), the material air tightness detection module (21) further includes a gasket (212), the gasket (212) is installed in the annular groove at the end of the pressure vessel (111), and a test sample (213) is provided between the gasket (212) and the leakage plate (214).

6. The device for testing air tightness of flexible materials under high temperature and high pressure according to claim 5, characterized in that: The gas collecting hood (215) and the thermal flow meter (217) are connected via a rectifier tube (216).

7. The device for testing air tightness of flexible materials under high temperature and high pressure according to claim 1, characterized in that: The leaked gas recovery detection module (31) includes a heat dissipation copper tube (311), a copper tube bracket (312) is connected to the heat dissipation copper tube (311), one end of the heat dissipation copper tube (311) is connected to the material air tightness detection module (21), and the other end of the heat dissipation copper tube (311) is communicated with the upper side of the drainage gas collecting barrel shell (314), a drainage piston (315) is provided in the drainage gas collecting barrel shell (314), and the lower side of the drainage gas collecting barrel shell (314) is communicated with the water inlet and drainage pipe (313).

8. The device for testing air tightness of flexible materials under high temperature and high pressure according to claim 7, characterized in that: The heat dissipation copper tube (311) is arranged in a spiral shape.

9. The device for testing air tightness of flexible materials under high temperature and high pressure according to claim 5, characterized in that: The signal input end of the temperature and pressure control and analysis system is electrically connected to the pressure transmitter, the thermal resistor and the thermal flow meter, and the signal input end of the temperature and pressure control and analysis system is electrically connected to the air booster pump, the electric heating jacket and the pressure relief valve.

10. The air tightness testing device for flexible materials under high temperature and high pressure according to claim 5, characterized in that: A groove is provided on the leakage plate (214), and the gas collecting cover (215) is clamped in the groove.

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