Gas supply system and test system for high temperature gas flow meter testing

Abstract

This invention discloses a gas supply system for testing high-temperature gas flow meters, belonging to the technical field of testing equipment. It includes: a first balancing valve connected to a flow regulator to control the flow regulator's airflow magnitude via diaphragm movement; a first gas supply pipeline for providing control gas to the first balancing valve; a gas source output pipeline equipped with the flow regulator to adjust fluid parameters within the gas source output pipeline; and a first loop, one end connected to the output end of the gas source output pipeline and the other end connected to the first balancing valve. The gas supply system of this application can improve the adjustment accuracy of the gas supply system.

Description

Technical Field

[0001] This invention belongs to the technical field of flow meter testing systems, and specifically relates to a gas supply system and testing system for testing high-temperature gas flow meters. Background Technology

[0002] As aviation fluid instruments develop towards high performance and high reliability, more stringent requirements are placed on the control accuracy of the working parameters of their various subsystems. In particular, key parameters such as pressure and flow rate of the gas supply system directly affect the testing accuracy and operational stability of aero engines, aerodynamic accessories, and high-temperature gas flow meters.

[0003] Therefore, the testing environment for this type of fluid instrument needs to accurately simulate preset parameters such as temperature, pressure, and flow rate. Existing testing equipment typically employs a conventional closed-loop feedback control structure for its gas supply system. This involves acquiring the outlet pressure signal through a pressure sensor and adjusting the valve opening or compressor speed via a controller to maintain the set pressure. However, in actual high-temperature gas environments (e.g., media temperatures exceeding 300°C), pressure sensors are susceptible to thermal drift, resulting in significant delays and nonlinearities in the feedback signal. Furthermore, traditional PID control algorithms lack sufficient response speed when facing rapidly changing loads or temperature disturbances, easily exhibiting overshoot or oscillation. Consequently, the accuracy and timeliness of pressure feedback regulation fail to meet aerospace-grade testing requirements.

[0004] The aforementioned problems are particularly prominent in the dynamic calibration and performance evaluation of high-temperature gas flow meters. Fluctuations in the supply gas pressure directly introduce additional measurement errors, affecting the accuracy verification of the flow meter. Therefore, there is an urgent need to design a gas supply system that can achieve rapid and accurate pressure regulation and adapt to high-temperature operating conditions to improve the reliability and consistency of high-temperature gas flow meter testing. Summary of the Invention

[0005] To address the aforementioned problems, the technical objective of the first aspect of this invention is to provide a gas supply system for testing high-temperature gas flow meters, thereby improving the adjustment accuracy of the gas supply system. To achieve the above objectives, the following technical solution is proposed: This invention provides a gas supply system for testing high-temperature gas flow meters, characterized in that it comprises: A first balancing valve is connected to a flow regulator to control the flow regulator to adjust the airflow size by moving the diaphragm of the first balancing valve. The first gas supply line is used to provide control gas to the first balancing valve; The gas source output pipeline is equipped with the flow regulator to adjust the fluid parameters within the gas source output pipeline; The first circuit has one end connected to the output end of the gas source output pipeline and located downstream of the flow regulator, and the other end connected to the first balancing valve and located on the opposite side of the first gas supply pipeline connected to the first balancing valve, so as to automatically adjust the parameters of the output fluid when the output pressure in the gas source output pipeline exceeds the set pressure.

[0006] In some embodiments, a second gas supply line is also included, which is provided with a pressure regulating valve. The output end of the pressure regulating valve is connected to the first gas supply line for providing control gas to the first balancing valve. The first circuit is connected to the first end of the second circuit, and the second end of the second circuit is connected to the return port of the pressure regulating valve, so that the diaphragm of the pressure regulating valve moves in the opening direction under the action of feedback air pressure.

[0007] In some embodiments, the pressure regulating valve includes: The valve body includes an upper cavity, on which a diaphragm that can move up and down is installed. A spring is installed above the diaphragm. A movable disk is installed above the spring. A control component is installed on the top of the movable disk. The pressure applied by the spring to the diaphragm is controlled by moving the control component. A valve seat, in which a valve core is installed, the valve core is mounted on a valve shaft, the valve shaft is mounted on a valve body that can move up and down, and the valve shaft is configured to have a tendency to move in the direction of the diaphragm; An air inlet and an air outlet are configured to adjust the opening degree between the two by the cooperation of the valve core and the valve seat; The valve body is also provided with a return air port that connects to the cavity below the diaphragm.

[0008] In some embodiments, the second gas supply line is provided with a first solenoid valve located between the pressure regulating valve and the first gas supply line; and / or The second circuit is equipped with a second solenoid valve.

[0009] In some embodiments, a proportional valve is provided on the first gas supply line.

[0010] In some embodiments, an adjustable flow valve is provided on the first circuit, and a silencer is provided at the exhaust end of the adjustable flow valve.

[0011] In some embodiments, the flow regulator includes a valve housing, a sealing seat formed within the valve housing, and a valve core disposed within the valve housing. The valve core is connected to the diaphragm of the first balancing valve via a control rod. The flow regulator is configured to adjust fluid parameters by controlling the distance between the valve core and the sealing seat.

[0012] The second aspect of the present invention aims to provide a high-temperature gas flow meter testing system to improve the accuracy of the test.

[0013] A high-temperature gas flow meter testing system, employing the aforementioned gas supply system.

[0014] In some implementations, the following are included: The gas supply module is used to provide the gas supply. An air intake module is connected to the exhaust end of the air source module. At least one pipeline of the air intake module is equipped with the air supply system for high-temperature gas flow meter testing, which is used to provide a stable air source. A high-temperature environment test chamber is connected to the exhaust end of the air intake module and is used to receive air and test the test pieces. The exhaust module is connected to the exhaust end of the high-temperature environment test chamber and is used to vent the high-temperature environment test chamber and the gas.

[0015] In some embodiments, the air intake module includes a filter, a first control valve, a first temperature thermocouple, a first pressure sensor, a first humidity sensor, a second control valve, a first mass flow meter, a gas supply system tested by a high-temperature gas flow meter, a fourth control valve, a sixth control valve, two electric heaters connected in series, a fourth control valve, a second temperature thermocouple, and a second pressure sensor, wherein multiple gas supply systems may be connected in parallel. The exhaust module includes a third temperature thermocouple, a third pressure sensor, an expansion joint, a fifth control valve, and a heat exchanger connected in sequence. The heat exchanger is vented at its end, and the two ends of the pipe that exchanges heat with the heat exchanger are respectively connected to the two ends of a sixth control valve. A seventh control valve is also provided on this pipe. A pipeline for supplying gas to the test system instruments and valves is provided between the first control valve and the first temperature thermocouple.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention include at least the following: This invention uses the first gas supply pipeline as a pilot stage to provide precise settings; the balance valve and flow regulator are linked to achieve high-gain amplification. This solution can also effectively absorb pressure fluctuations in the gas source, making the output gas source stable, accurate, and reliable. The adjustment action is synchronized with the pressure deviation, with no calculation delay. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a gas supply system for testing a high-temperature gas flow meter, according to a specific embodiment of this application.

[0018] Figure 2 This is a cross-sectional structural schematic diagram of a pressure regulating valve according to a specific embodiment of this application; Figure 3 This is a schematic diagram of a flow meter testing system according to a specific embodiment of this application; Figure 4 This is a schematic diagram of a gas source module according to a specific embodiment of this application; Figure 5 yes Figure 3 The schematic diagrams of the intake module, high-temperature environment test chamber, and exhaust module are shown.

[0019] 01-First gas supply line; 02-Second gas supply line; 03-Gas source output line; 04-First circuit; 05-Second circuit; 1-Proportional valve; 3-First balancing valve; 4-Pressure regulating valve, 401-Valve body, 402-Valve core, 403-Spring, 404-Diaphragm, 405-Valve shaft, 406-Valve seat, 407-Control component, 408-Moving disc, 409-Inlet, 410-Outlet, 411-Return port; 5-Flow regulator; 6-Adjustable flow valve; 7-First solenoid valve; 8-Second solenoid valve; 001 - Gas source module; 002 - Intake module; 003 - High Temperature Environment Test Chamber; 004 - Exhaust module. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Currently, aviation fluid instruments have high requirements for the accuracy and timeliness of pressure and flow regulation of the air supply system. Existing closed-loop feedback control has problems such as sensor thermal drift, slow PID response, and overshoot oscillation. Therefore, new technical solutions are needed.

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] Please see Figures 1-2 In a first aspect, this application provides a gas supply system for testing high-temperature gas flow meters. The gas supply system includes: a first balancing valve 3, a first gas delivery pipeline 01, a gas source output pipeline 03, and a first circuit 04. The first balancing valve 3 is connected to a flow regulator 5, and the flow regulator 5 is controlled by the movement of the diaphragm of the first balancing valve 3 to adjust the airflow magnitude. The first balancing valve 3 serves as the main valve for regulating gas pressure and flow rate.

[0026] The first gas supply line 01 is used to provide control gas to the first balancing valve 3. After adjustment and control, the gas source forms a precise pressure airflow to interact with the first balancing valve 3 and adjust the fluid flow rate of the flow regulator 5.

[0027] The gas source output pipeline 03 is equipped with the flow regulator 5 to adjust the fluid parameters in the gas source output pipeline 03, including pressure and flow rate, with pressure adjustment being the main adjustment.

[0028] One end of the first circuit 04 is connected to the output end of the gas source output pipeline 03 and is located downstream of the flow regulator 5. The other end is connected to the first balance valve 3 and is located on the opposite side of the first gas supply pipeline 01 connected to the first balance valve 3, so that when the output pressure in the gas source output pipeline 03 exceeds the set pressure, the parameters of the output fluid are automatically adjusted.

[0029] Its working process is as follows: Pressure setting: The first gas supply line 01 provides a regulated and stable control gas source to one side of the balance valve diaphragm, and the pressure corresponds to the target value setting of the required output pressure.

[0030] Main airflow output: The high-temperature gas in the gas source output pipeline 03 flows through the flow regulator 5, and its opening degree is determined by the displacement of the diaphragm of the balance valve, thereby controlling the output pressure / flow.

[0031] Pressure feedback: The first loop 04 returns the actual pressure downstream of the output pipeline to the other side of the balance valve diaphragm, thereby achieving automatic balance regulation.

[0032] When the output pressure is lower than the set value, the pressure on the feedback side is less than the pressure on the set side, causing the diaphragm to move towards the feedback side. This, in turn, causes the flow regulator to open wider, increasing the output pressure. When the output pressure is higher than the set value, the pressure on the feedback side is greater than the pressure on the set side, causing the diaphragm to move towards the set side. This, in turn, causes the flow regulator to close narrower, decreasing the output pressure. Ultimately, pressure balance is achieved on both sides of the diaphragm, and the output pressure stabilizes near the set value.

[0033] The first gas supply line acts as a pilot stage, providing precise settings. The balancing valve and flow regulator work together to achieve high-gain amplification. This design effectively absorbs pressure fluctuations in the gas source, ensuring a stable, accurate, and reliable output gas supply. The adjustment action is synchronized with the pressure deviation, with no calculation delay. Compared to electronic PID control, this system eliminates the need for pressure sensors, controllers, and electrical converters, avoiding the thermal drift problems of electronic components under high-temperature environments.

[0034] In some embodiments, a second gas supply line 02 is also included, on which a pressure regulating valve 4 is provided. The output end of the pressure regulating valve 4 is connected to the first gas supply line 01 for providing control gas to the first balance valve 3. The first circuit is connected to the first end of the second circuit 05, and the second end of the second circuit is connected to the return port of the pressure regulating valve 4, so that the diaphragm of the pressure regulating valve 4 moves in the opening direction under the action of feedback air pressure.

[0035] It is understandable that, through the set second gas supply pipeline, pressure regulating valve 4, and second circuit 05, the entire gas supply system constitutes a two-stage cascade pneumatic feedback control loop. This design can achieve more precise adjustment of the pressure of the first gas supply pipeline 01 through the second gas supply pipeline, eliminate possible steady-state deviations, quickly offset rapid disturbances, and ensure that the gas supply system has high accuracy and timeliness in testing the flow rate of high-temperature gas. In particular, when the opening of the pressure regulating valve 4 is increased, it can promote the system to quickly reach a steady state.

[0036] The pressure regulating valve 4 includes: The valve body 401 includes an upper cavity on which a diaphragm 404 is mounted that can move up and down. A spring 403 is mounted above the diaphragm 404. A movable disk 408 is mounted on the upper part of the spring 403. A control element 407 is mounted on the top of the movable disk 408. The pressure applied to the diaphragm by the spring 403 is controlled by moving the control element 407. The valve seat 406 contains a valve core 402 mounted on a valve shaft 405. The valve shaft is mounted on the valve body that can move up and down, and the valve shaft is configured to have a tendency to move towards the diaphragm 404. The air inlet 410 and the air outlet 411 are configured to adjust the opening degree between them by the cooperation of the valve core 402 and the valve seat 406. The valve body 401 is also provided with a return air port 411 that connects to the cavity below the diaphragm 404.

[0037] The control element 407 can be manually controlled or automatically controlled via pressure feedback. In manual control, the control element is a rotary wheel, which is threaded onto the valve body 401. Rotation causes the wheel to move up and down, which in turn moves the movable disc up and down, applying greater / less pressure to the spring, thus causing the diaphragm 404 to move up and down, controlling the opening of the valve core 402. The provided return air port 411 improves control response and steady-state adjustment speed.

[0038] In some embodiments, the second gas supply line 02 is provided with a first solenoid valve 7 located between the pressure regulating valve 4 and the first gas supply line 01, and the second circuit 05 is provided with a second solenoid valve 8.

[0039] In some embodiments, the first gas supply line 01 is provided with a proportional valve 1 to precisely adjust the airflow parameters of the first gas source.

[0040] In some embodiments, the first circuit 04 is provided with an adjustable flow valve 6, and the exhaust end of the adjustable flow valve 6 is provided with a muffler, and the adjustable flow valve 6 can...

[0041] In this pneumatic feedback loop, the adjustable flow valve 6 is equivalent to an adjustable air resistance, which forms an air-capacitance-air resistance filtering link with the volume of the diaphragm cavity of the balance valve. This can filter out high-frequency noise or pulsation in the output pressure, prevent the balance valve from frequently shaking due to small pressure fluctuations, and extend the service life of the valve and flow regulator.

[0042] During adjustment, especially when the adjustable flow valve in the first loop is at a small opening or when pressure fluctuates, a small amount of gas may be discharged from the valve's exhaust port or pilot exhaust port. This high-speed airflow generates a sharp noise. Installing a silencer reduces airflow velocity and pressure pulsation, significantly decreasing exhaust noise and meeting the noise control requirements of aviation test facilities, typically below 85 dB.

[0043] In addition, the built-in filter layer of the silencer, such as sintered copper or foam metal, can prevent dust and oil mist in the air from entering the diaphragm cavity of the adjustable flow valve and the first balance valve, ensuring the cleanliness of the air path, avoiding throttling orifice blockage or diaphragm contamination, and improving the long-term reliability of the system.

[0044] In some embodiments, the flow regulator 5 includes a valve housing, a sealing seat formed within the valve housing, and a valve core disposed within the valve housing. The valve core is connected to the diaphragm of the first balancing valve via a control rod. The flow regulator 5 is configured to adjust the fluid parameters of the fluid by controlling the distance between the valve core and the sealing seat.

[0045] The valve body, sealing seat, and valve core can all be made of high-temperature resistant alloys or ceramic coatings. The control lever can be equipped with a heat-insulating section or made of a material with low thermal conductivity to prevent the diaphragm from overheating, enabling the first balancing valve to operate stably for extended periods in high-temperature gas environments ranging from 300℃ to 600℃. Under the scouring of high-temperature, high-speed airflow, the minute gap between the valve core and the sealing seat generates a shearing airflow, which can blow away any carbon particles, oxides, or oil stains that may accumulate on the surface, preventing valve jamming. This is particularly suitable for testing high-temperature fuel gas after aviation kerosene combustion.

[0046] The valve core is directly connected to the diaphragm of the first balance valve via a control rod, which enables this gas supply system to have the characteristics of extremely fast response, high linearity adjustment of pressure deviation-opening degree-pressure stability, high temperature resistance of 300℃~600℃, self-cleaning, and easy maintenance.

[0047] Please see Figures 1-5 In a second aspect, this application provides a high-temperature gas flow meter testing system that uses the aforementioned gas supply system. Since this testing system has all the technical features of the aforementioned gas supply system, it also has all its technical effects.

[0048] This high-temperature gas flow meter testing system includes: Gas source module 001 is used to provide a gas source; The intake module 002 is connected to the exhaust end of the gas source module 001. At least one pipeline of the intake module 002 is equipped with the gas supply system for high-temperature gas flow meter testing, which is used to provide a stable gas source. The high-temperature environment test chamber 003 is connected to the exhaust end of the air intake module 002 and is used to receive the air source and test the test piece; The exhaust module 004 is connected to the exhaust end of the high-temperature environment test chamber 003 and is used to vent the high-temperature environment test chamber 003 and the gas.

[0049] The intake module 002 integrates the aforementioned two-stage cascade pneumatic feedback air supply system, enabling millisecond-level response to load changes and controlling output pressure fluctuations within an extremely small range, such as ±0.2%. Compared to traditional test benches using electronic PID control, this solution exhibits no overshoot, no oscillation, and no sensor thermal drift, making it particularly suitable for steady-state and dynamic calibration of flow meters in high-temperature environments. Stable air supply pressure directly reduces additional uncertainties in the flow meter measurement process. Especially for vortex flow meters, pressure fluctuations can cause changes in fluid density, thus affecting the conversion relationship between frequency and flow rate. This system suppresses pressure fluctuations to within 0.5%, reducing flow meter calibration uncertainty by more than 30%.

[0050] In some embodiments, the air intake module 002 includes a filter, a first control valve, a first temperature thermocouple, a first pressure sensor, a first humidity sensor, a second control valve, a first mass flow meter, a high-temperature gas flow meter test air supply system PR, a fourth control valve, a sixth control valve, two electric heaters connected in series, a fourth control valve, a second temperature thermocouple, and a second pressure sensor, wherein multiple air supply systems PR can be connected in parallel. The exhaust module 004 includes a third temperature thermocouple, a third pressure sensor, an expansion joint, a fifth control valve, and a heat exchanger connected in sequence. The heat exchanger is vented at its end, and the two ends of the pipe that exchanges heat with the heat exchanger are respectively connected to the two ends of a sixth control valve. A seventh control valve is also provided on this pipe. A pipeline for supplying gas to the test system instruments and valves is provided between the first control valve and the first temperature thermocouple.

[0051] In the above scheme, the sequential arrangement of filters, first control valves, temperature, pressure and humidity sensors, and mass flow meters ensures that the gas entering the PR system is clean, its state is measurable, and its flow rate is controllable. Multiple parallel PR units can be flexibly activated according to test requirements, achieving wide-range, high-precision independent adjustment of pressure / flow. Two series-connected electric heaters, in conjunction with the front and rear fourth control valves and the second temperature and pressure sensor, can rapidly heat the gas to the target high temperature and precisely control the temperature, thereby simulating the real high-temperature environment of aviation. The third temperature and pressure sensor in the exhaust module monitors the state of the exhaust gas in real time, the expansion joint absorbs thermal deformation stress, the heat exchanger cools the high-temperature exhaust gas and safely discharges it, and the bypass formed by the sixth and seventh control valves can lead some of the hot gas back to the hot side inlet of the heat exchanger to achieve waste heat recovery or regulate the exhaust temperature. At the same time, the branch pipeline before the first control valve provides a clean instrument air source for all pneumatic valves and instruments in the test system, ensuring the long-term stable operation of the entire system.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the technical solution of this invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of this application.

Claims

1. A gas supply system for testing high-temperature gas flow meters, characterized in that, include: The first balancing valve (3) is connected to the flow regulator (5) to control the flow regulator (5) to adjust the airflow size by moving the diaphragm of the first balancing valve (3); The first gas supply line (01) is used to provide control gas to the first balancing valve (3); The gas source output pipeline (03) is equipped with the flow regulator (5) to adjust the fluid parameters in the gas source output pipeline (03); The first circuit (04) is connected at one end to the output end of the gas source output pipeline (03) and at the other end to the first balance valve (3), and is located on the opposite side of the first gas supply pipeline (01) connected to the first balance valve (3), so that when the output pressure in the gas source output pipeline (03) exceeds the set pressure, the parameters of the output fluid are automatically adjusted.

2. The gas supply system for testing high-temperature gas flow meters according to claim 1, characterized in that, It also includes a second gas supply line (02), on which a pressure regulating valve (4) is provided. The output end of the pressure regulating valve (4) is connected to the first gas supply line (01) for providing control gas to the first balance valve (3). The first circuit is connected to the first end of the second circuit (05), and the second end of the second circuit is connected to the return port of the pressure regulating valve (4) so ​​that the diaphragm of the pressure regulating valve (4) moves in the opening direction under the action of the feedback air pressure.

3. The gas supply system for testing high-temperature gas flow meters according to claim 2, characterized in that, The pressure regulating valve (4) includes: The valve body (401) includes an upper cavity on which a diaphragm (404) is mounted that can move up and down. A spring (403) is mounted above the diaphragm (404). A movable disk (408) is mounted on the upper part of the spring (403). A control element (407) is mounted on the top of the movable disk (408). The pressure applied to the diaphragm by the spring (403) is controlled by the movement of the control element (407). A valve seat (406) is provided with a valve core (402) installed therein. The valve core (402) is mounted on a valve shaft (405). The valve shaft is mounted on the valve body in a way that allows it to move up and down. The valve shaft is configured to have a tendency to move in the direction of the diaphragm (404). An air inlet (410) and an air outlet (411) are configured to adjust the opening between the two by the cooperation of the valve core (402) and the valve seat (406); The valve body (401) is also provided with a return air port (411) that connects to the cavity below the diaphragm (404).

4. The gas supply system for testing high-temperature gas flow meters according to claim 2 or 3, characterized in that, The second gas supply line (02) is provided with a first solenoid valve (7) located between the pressure regulating valve (4) and the first gas supply line (01); and / or The second circuit (05) is equipped with a second solenoid valve (8).

5. The gas supply system for testing high-temperature gas flow meters according to claim 1, 2, or 3, characterized in that, The first gas pipeline (01) is equipped with a proportional valve (1).

6. The gas supply system for testing high-temperature gas flow meters according to claim 1, 2, or 3, characterized in that, The first circuit (04) is equipped with an adjustable flow valve (6), and the exhaust end of the adjustable flow valve (6) is equipped with a muffler.

7. The gas supply system for testing high-temperature gas flow meters according to claim 1, 2, or 3, characterized in that, The flow regulator (5) includes a valve housing, a sealing seat formed within the valve housing, and a valve core disposed within the valve housing. The valve core is connected to the diaphragm of the first balancing valve via a control rod. The flow regulator (5) is configured to adjust the fluid parameters of the fluid by controlling the distance between the valve core and the sealing seat.

8. A high-temperature gas flow meter testing system, characterized in that, The gas supply system described in any one of claims 1-7 is used.

9. The high-temperature gas flow meter testing system according to claim 8, characterized in that, include: Gas source module (001) is used to provide a gas source; An intake module (002) is connected to the exhaust end of the gas source module (001). At least one pipeline of the intake module (002) is provided with the gas supply system for high-temperature gas flow meter testing, which is used to provide a stable gas source. The high-temperature environment test chamber (003) is connected to the exhaust end of the air intake module (002) and is used to receive the air source and test the test piece; The exhaust module (004) is connected to the exhaust end of the high-temperature environment test chamber (003) and is used to vent the high-temperature environment test chamber (003) and the gas.

10. The high-temperature gas flow meter testing system according to claim 9, characterized in that, The air intake module (002) includes a filter, a first control valve, a first temperature thermocouple, a first pressure sensor, a first humidity sensor, a second control valve, a first mass flow meter, a gas supply system (PR) tested by a high-temperature gas flow meter, a fourth control valve, a sixth control valve, two electric heaters connected in series, a fourth control valve, a second temperature thermocouple, and a second pressure sensor, wherein multiple gas supply systems (PR) can be connected in parallel. The exhaust module (004) includes a third temperature thermocouple, a third pressure sensor, an expansion joint, a fifth control valve, and a heat exchanger connected in sequence. The heat exchanger is vented at its end, and the two ends of the pipe that exchanges heat with the heat exchanger are respectively connected to the two ends of a sixth control valve. A seventh control valve is also provided on this pipe. A pipeline for supplying gas to the test system instruments and valves is provided between the first control valve and the first temperature thermocouple.

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