A flow test device with adjustable medium temperature and ambient temperature

Abstract

The utility model relates to a flow test device of medium temperature and environmental temperature can be adjusted. Including high pressure gas source, gas filter drying device, gas storage tank, pressure regulating valve, medium gas inlet control valve, medium temperature temperature control box, the temperature control box of being examined table working environment, standard ware environment temperature control box and vacuum pump. The utility model carries out accurate regulation and management and control to medium temperature, the temperature control of being examined table working environment and standard ware environment respectively, and then realizes the test appeal of working medium temperature and the temperature of being examined table working environment under different temperature conditions, through the medium gas inlet control valve of additional equipment, the gas outlet control valve of being examined table, medium gas inlet three way valve and the gas inlet control three way valve of being examined table, the whole test process is divided into several subintervals, and each subinterval contains execution stage and recovery stage, utilizes the valve control, through shortening the test length of single execution stage and prolonging the temperature recovery time mode, reduces the influence that medium and gas meter cause to test because of heat exchange.

Description

Technical Field

[0001] This utility model relates to a flow test device in which both the medium temperature and the ambient temperature can be adjusted. Background Technology

[0002] Existing gas meter flow detection devices typically only simulate static temperature conditions (such as setting the medium temperature and ambient temperature to the same value), making it difficult to reproduce the coupled scenarios where the medium temperature and the ambient temperature of the meter under test change dynamically in actual applications (for example, when there is a significant difference between indoor and outdoor temperatures, natural gas flows from an outdoor gas pipeline into an indoor gas meter). Because of the temperature difference between the medium and the ambient temperature, heat exchange inevitably occurs between them during the test, which can cause changes in both the medium and ambient temperatures, exceeding the test requirements. Simultaneously, due to temperature changes during the test, the volume of the working condition traversed by the meter under test is affected by temperature variations, making it difficult to accurately calculate the reference volume. This limitation results in insufficient verification of the gas meter's temperature sensitivity, dynamic response, and accuracy stability, failing to meet the stringent requirements of EN 1359 "Diaphragm Gas Meters" and EN 14236 "Ultrasonic Gas Meters" for testing under complex conditions (such as a 20°C difference between the working medium temperature and the gas meter's operating ambient temperature). Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a technical solution for a flow test device in which both the medium temperature and the ambient temperature can be adjusted.

[0004] The flow test device, which allows for adjustment of both medium temperature and ambient temperature, is characterized by comprising a high-pressure gas source, a gas filtration and drying device, a gas storage tank, a pressure regulating valve, a medium inlet control valve, a medium temperature control chamber, a working environment temperature control chamber for the instrument under test, a standard environment temperature control chamber, and a vacuum pump. The high-pressure gas source is connected in sequence to the gas filtration and drying device, the gas storage tank and the pressure regulating valve. The outlet of the pressure regulating valve is connected to the inlet of the medium inlet control valve. The medium temperature control box is equipped with a medium heat exchanger and a medium inlet three-way valve. One inlet of the medium inlet three-way valve is connected to the outlet of the medium inlet control valve, and the other inlet of the medium inlet three-way valve is connected to the outlet of the medium recovery insulation pipe. The outlet of the medium inlet three-way valve is connected to the inlet of the medium heat exchanger. The outlet of the medium heat exchanger is connected to the inlet of the medium outlet insulation pipe. The outlet of the medium outlet insulation pipe passes through the medium temperature control box and the working environment temperature control box of the instrument under test, and then connects to one inlet of the inlet control three-way valve of the instrument under test. The test instrument's working environment temperature control box is equipped with a test instrument inlet control three-way valve, a test instrument outlet control valve, and the test instrument itself. One outlet of the test instrument inlet control three-way valve is connected to the inlet of the medium recovery insulation pipe, and the other outlet of the test instrument inlet control three-way valve is connected to the inlet of the test instrument. The inlet of the test instrument outlet control valve is connected to the outlet of the test instrument. The outlet of the test instrument outlet control valve passes through the test instrument working environment temperature control box and the standard environment temperature control box and is connected to the inlet of the heat exchanger for the nozzle standard. The outlet of the heat exchanger for the nozzle standard is connected to the inlet of the nozzle standard. The outlet of the nozzle standard is connected to the vacuum pump. The heat exchanger and nozzle standard of the nozzle standard are installed inside the ambient temperature control box of the standard.

[0005] The flow test device, in which both the medium temperature and ambient temperature are adjustable, is characterized in that the medium temperature control chamber, the working environment temperature control chamber of the tested instrument, and the standard instrument environment temperature control chamber are each independently temperature controlled, and are used to adjust the working medium temperature, the working environment temperature of the tested instrument, and the working environment temperature of the nozzle standard instrument, respectively.

[0006] The flow test device, which allows for adjustment of both medium temperature and ambient temperature, is characterized in that a temperature sensor and a pressure sensor for the air inlet of the instrument under test are provided at the air inlet of the instrument under test.

[0007] The flow test device, in which both the medium temperature and the ambient temperature are adjustable, is characterized in that the nozzle standard is equipped with a nozzle standard temperature sensor and a nozzle standard pressure sensor.

[0008] The flow test device, in which both the medium temperature and the ambient temperature are adjustable, is characterized in that a medium temperature control chamber temperature sensor is installed inside the medium temperature control chamber.

[0009] The flow test device, in which both the medium temperature and the ambient temperature are adjustable, is characterized in that a temperature sensor for the working environment temperature control chamber of the gas meter is installed inside the working environment temperature control chamber of the meter under test.

[0010] The flow test device, in which both the medium temperature and the ambient temperature are adjustable, is characterized in that a nozzle standard temperature control chamber temperature sensor is installed inside the standard ambient temperature control chamber.

[0011] The flow test device, in which both the medium temperature and the ambient temperature are adjustable, is characterized in that a vacuum pump pressure sensor is installed between the nozzle standard and the vacuum pump.

[0012] The flow test device, in which both the medium temperature and the ambient temperature are adjustable, is characterized in that both the medium outlet insulation pipe and the medium recovery insulation pipe are stainless steel pipes with insulation layers.

[0013] The flow test device is characterized in that the gas filtration and drying device is a refrigerated dryer, used to remove oil and water vapor from the gas source.

[0014] This invention employs three temperature control chambers to precisely regulate and control the temperature of the medium, the working environment temperature of the meter under test, and the ambient temperature of the standard, preventing mutual interference and meeting the different test temperature requirements of the three. This allows for testing under varying temperature conditions for both the working medium and the meter under test. By adding a medium inlet control valve, a meter under test outlet control valve, a medium inlet three-way valve, and a meter under test inlet control three-way valve, the gas path is controlled during the test. The entire test process is divided into several sub-sections, each containing an execution phase and a recovery phase. Valve control reduces the impact of heat exchange between the medium and the gas meter on the test by shortening the test time of each execution phase and extending the temperature recovery time. Simultaneously, by adding a medium recovery insulation pipe between the medium heat exchanger and the meter under test inlet, medium recovery is achieved, allowing the working medium temperature to quickly rise to the specified test temperature during the recovery phase. Furthermore, this utility model utilizes the air inlet temperature sensor, the air inlet pressure sensor, the nozzle standard temperature sensor, and the nozzle standard pressure sensor to achieve high-speed synchronous acquisition and processing of temperature and pressure data during the test. It can simultaneously analyze the medium temperature, the working environment temperature of the tested instrument, the standard temperature, and the flow data, effectively eliminating cross-interference between temperature and flow, thereby achieving accurate measurement of the standard volume during the test. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1-High-pressure gas source, 2-Gas filtration and drying device, 3-Gas storage tank, 4-Pressure regulating valve, 5-Medium inlet control valve, 6-Medium inlet three-way valve, 7-Medium heat exchanger, 8-Medium outlet insulation pipe, 9-Medium recovery insulation pipe, 10-Medium temperature control box, 11-Working environment temperature control box for the instrument under test, 12-Inlet control three-way valve for the instrument under test, 13-Instrument under test, 14-Outlet control valve for the instrument under test, 15-Heat exchanger for the nozzle standard, 16-Nozzle standard, 17-Standard environment temperature control box, 18-Vacuum pump. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings: A flow test device with adjustable medium temperature and ambient temperature includes a high-pressure gas source 1, a gas filtration and drying device 2, a gas storage tank 3, a pressure regulating valve 4, a medium inlet control valve 5, a medium temperature control box 10, a working environment temperature control box for the instrument under test 11, a standard instrument environment temperature control box 17, and a vacuum pump 18.

[0017] The high-pressure gas source 1 is connected in sequence to the gas filtration and drying device 2, the gas storage tank 3 and the pressure regulating valve 4. The outlet of the pressure regulating valve 4 is connected to the inlet of the medium inlet control valve 5. The gas filtration and drying device 2 is a refrigerated dryer used to remove oil and water vapor from the gas source.

[0018] The medium temperature control chamber 10 is equipped with a medium heat exchanger 7 and a medium inlet three-way valve 6. One inlet of the medium inlet three-way valve 6 is connected to the outlet of the medium inlet control valve 5, and the other inlet of the medium inlet three-way valve 6 is connected to the outlet of the medium recovery insulation pipe 9. The outlet of the medium inlet three-way valve 6 is connected to the inlet of the medium heat exchanger 7. The outlet of the medium heat exchanger 7 is connected to the inlet of the medium outlet insulation pipe 8. The outlet of the medium outlet insulation pipe 8 passes through the medium temperature control chamber 10 and the working environment temperature control chamber 11 of the instrument under test, and then connects to one inlet of the inlet control three-way valve 12 of the instrument under test. Both the medium outlet insulation pipe 8 and the medium recovery insulation pipe 9 are stainless steel pipes with insulation layers.

[0019] The test instrument working environment temperature control box 11 is equipped with a test instrument inlet control three-way valve 12, a test instrument outlet control valve 14, and a test instrument 13. One outlet of the test instrument inlet control three-way valve 12 is connected to the inlet of the medium recovery insulation pipe 9, and the other outlet of the test instrument inlet control three-way valve 12 is connected to the inlet of the test instrument 13. The inlet of the test instrument outlet control valve 14 is connected to the outlet of the test instrument 13. The outlet of the test instrument outlet control valve 14 passes through the test instrument working environment temperature control box 11 and the standard environment temperature control box 17 and is connected to the inlet of the nozzle standard heat exchanger 15. The outlet of the nozzle standard heat exchanger 15 is connected to the inlet of the nozzle standard 16. The outlet of the nozzle standard 16 is connected to the vacuum pump 18. The nozzle standard heat exchanger 15 and the nozzle standard 16 are located inside the standard environment temperature control box 17.

[0020] To eliminate cross-interference between temperature and flow rate during the test, this invention incorporates several sensors, specifically: a medium temperature control chamber temperature sensor Tg, a gas meter operating environment temperature control chamber temperature sensor TA, a gas meter inlet temperature sensor Tm, a gas meter inlet pressure sensor Pm, a nozzle standard temperature control chamber temperature sensor TS, a nozzle standard temperature sensor TR, a nozzle standard pressure sensor PR, and a vacuum pump pressure sensor P. These sensors allow for real-time monitoring of temperature and pressure data at relevant locations. The measured values ​​from these sensors can be used to correct the flow rate during the test in real time, enabling accurate calculation of the reference volume. In implementation, existing computers and high-speed data acquisition and processing modules can be used for control. These modules collect sensor data and control valve operation. The computer, high-speed data acquisition, and processing modules are existing technologies and not within the scope of this invention; therefore, they will not be elaborated upon here. This invention only relates to structural design; specific applications will be configured according to user requirements.

[0021] The medium temperature control box 10, the working environment temperature control box 11 of the instrument under test, and the standard environment temperature control box 17 are each independently temperature controlled to adjust the working medium temperature, the working environment temperature of the instrument under test, and the working environment temperature of the nozzle standard, respectively.

[0022] A temperature sensor Tm and a pressure sensor Pm are installed at the air inlet of the meter under test 13. A temperature sensor TR and a pressure sensor PR are installed on the nozzle standard 16. A medium temperature control box temperature sensor Tg is installed inside the medium temperature control box 10. A gas meter working environment temperature control box temperature sensor TA is installed inside the working environment temperature control box 11 of the meter under test. A nozzle standard temperature control box temperature sensor TS is installed inside the standard environment temperature control box 17. A vacuum pump pressure sensor P is installed between the nozzle standard 16 and the vacuum pump 18.

[0023] Among them, the medium temperature control chamber temperature sensor Tg is used to detect whether the temperature of the medium temperature control chamber 10 reaches the test medium temperature; the gas meter working environment temperature control chamber temperature sensor TA is used to detect whether the temperature of the working environment temperature control chamber 11 of the tested gas meter reaches the test gas meter working temperature; the tested gas meter inlet temperature sensor Tm is used to collect the temperature data of the tested gas meter inlet 13 during the test; the tested gas meter inlet pressure sensor Pm is used to collect the pressure data of the tested gas meter inlet 13 during the test; the nozzle standard temperature sensor TR is used to collect the temperature data of the nozzle standard 16 during the test; and the nozzle standard pressure sensor PR is used to collect the pressure data of the nozzle standard 16 during the test. The flow rate during the test can be corrected in real time using the measured values ​​of the above sensors to achieve accurate calculation of the reference volume. The vacuum pump pressure sensor P is used to collect the pressure data of the vacuum pump 18, and its function is to confirm that the nozzle standard 16 meets the test requirements by calculating the back pressure ratio.

[0024] The functions of each component are as follows: The high-pressure air source 1 is specifically an air compressor, whose function is to supply air to the entire device; the gas filtration and drying device 2 is specifically a refrigerated dryer, whose function is to clean and dry the air source, filtering out oil and water vapor mixed in the air source; the air storage tank 3 acts as a pressure buffer, working in conjunction with the pressure regulating valve 4 to ensure pressure stability during the test; the pressure regulating valve 4 is responsible for adjusting the output pressure of the air storage tank 3 to meet the pressure requirements specified in the test; the medium inlet control valve 5 is used to control the inlet of the medium during the test; the medium inlet valve 3... The function of valve 6 is to switch the source of the medium entering the medium heat exchanger 7; the task of the medium heat exchanger 7 is to ensure that the medium fully carries out heat exchange, so that its temperature reaches the temperature set in the medium temperature control box 10; the medium outlet insulation pipe 8 is specifically a stainless steel pipe with an insulation layer, and its function is to introduce the medium that has completed the heat exchange process through the medium heat exchanger 7 into the test instrument inlet control three-way valve 12 in the test instrument working environment temperature control box 11; the medium recovery insulation pipe 9 is specifically a stainless steel pipe with an insulation layer, and its function is to return the medium from the test instrument... The working environment temperature control chamber 11 of the test instrument guides the medium inlet three-way valve 6 into the medium temperature control chamber 10; the medium temperature control chamber 10 is controlled by the host computer to heat or cool the temperature inside the chamber to meet the temperature requirements of the medium during the test; the working environment temperature control chamber 11 of the test instrument is also controlled by the host computer to heat or cool the temperature inside the chamber, the purpose of which is to ensure that the test instrument 13 meets the conditions of the test working environment; the inlet control three-way valve 12 of the test instrument is used to switch the output direction of the medium in the medium outlet insulation pipe 8; the outlet control of the test instrument The function of valve 14 is to control the entry of the medium into the nozzle standard heat exchanger 15; the function of the nozzle standard heat exchanger 15 is to ensure that the medium undergoes sufficient heat exchange so that its temperature reaches the temperature set in the standard ambient temperature control chamber 17; the nozzle standard 16 is used to control and calculate the test reference flow rate; the standard ambient temperature control chamber 17 is controlled by the host computer to heat or cool the temperature inside the chamber to meet the working ambient temperature requirements of the nozzle standard 16; the vacuum pump 18 is used to generate a low-pressure zone to meet the working pressure requirements of the nozzle standard 16.

[0025] The test process is divided into multiple sub-sections, each including an execution phase and a recovery phase. In the execution phase, the medium inlet control valve 5 and the test instrument outlet control valve 14 are opened, and the medium inlet three-way valve 6 and the test instrument inlet control three-way valve 12 are switched to the test path. In the recovery phase, the two control valves are closed, and the two three-way valves are switched to the medium recovery path, so that the medium flows back to the medium temperature control box 10 through the medium recovery insulation pipe 9 to accelerate the recovery of the medium temperature.

[0026] The usage process is as follows: S1: First, by controlling the two control valves and the three three-way valves, the medium circulates in the medium temperature control box 10, and the working environment temperature control box 11 of the instrument under test and the standard environment temperature control box 17 are adjusted to their respective set temperatures and stabilized. S2: Switch valve control to allow the medium, whose temperature has been adjusted by the medium temperature control box 10, to enter the test instrument 13 through the medium outlet insulation pipe 8, and after flowing through the test instrument 13, it enters the nozzle standard device 16 for flow test, and at the same time starts data acquisition. S3: After the preset single test duration is reached, switch the valve control system to stop the medium flow to the tested gauge 13 and nozzle standard 16, and make the medium flow back to the medium temperature control box 10 through the medium recovery insulation pipe 9 for temperature recovery. S4: Wait for the temperature inside each temperature control box to recover to the set value and stabilize for the preset recovery time; S5: Repeat steps S2 to S4 a predetermined number of times to complete the test of all sub-intervals; S6: Calculate the indication error of the tested table 13 based on the data of each sub-interval collected by the high-speed data acquisition and processing module. Example

[0027] Using a G2.5 ultrasonic gas meter, with a working medium temperature of 20℃, a gas meter operating temperature of 0℃, and a standard temperature of 20℃, at a distance of 4m... 3 Using / h as an example of the test flow rate, the following explanation will be provided: Turn on the high-pressure gas source 1 and start the gas filtration and drying device 2. Adjust the pressure regulating valve 4 to make the output pressure of the gas storage tank 3 reach 2 kPa. Close the medium inlet control valve 5 and the test instrument outlet control valve 14. The medium inlet three-way valve 6 connects to the inlet of the medium heat exchanger 7 and the outlet of the medium recovery insulation pipe 9. The test instrument inlet control three-way valve 12 connects to the outlet of the medium outlet insulation pipe 8 and the inlet of the medium recovery insulation pipe 9. Start the medium temperature control chamber 10 so that the temperature detected by the temperature sensor of the medium temperature control chamber reaches the test medium temperature of 20℃; start the working environment temperature control chamber 11 of the gas meter under test so that the temperature detected by the temperature sensor of the working environment temperature control chamber of the gas meter reaches the working temperature of the test gas meter of 0℃; start the standard ambient temperature control chamber 17 so that the temperature detected by the temperature sensor of the nozzle standard temperature control chamber reaches the standard working temperature of 20℃. Wait until the temperature inside all temperature control chambers reaches the corresponding test temperature and remains stable at that temperature for 2 hours. Open the medium inlet control valve 5 and the test gauge outlet control valve 14. The medium inlet three-way valve 6 connects the outlet of the medium inlet control valve 5 to the inlet of the medium heat exchanger 7. The test gauge inlet control three-way valve 12 connects the outlet of the medium outlet insulation pipe 8 to the inlet of the test gauge 13. After the temperature of the medium is regulated by the temperature control box 10, the medium enters the test meter 13 through the medium outlet insulation pipe 8. After flowing through the test meter 13, it enters the nozzle standard device 16 for flow test, and the high-speed data acquisition and processing module is started to collect data of each sub-interval. Stop the nozzle standard 16 and vacuum pump 18, close the medium inlet control valve 5 and the test instrument outlet control valve 14, the medium inlet three-way valve 6 connects the inlet of the medium heat exchanger 7 and the outlet of the medium recovery insulation pipe 9, and the test instrument inlet control three-way valve 12 connects the outlet of the medium outlet insulation pipe 8 and the inlet of the medium recovery insulation pipe 9. Once the temperature inside all the temperature control chambers reaches the corresponding test temperature, and stabilizes at that temperature for the preset recovery time; Repeat the above steps, and finally calculate the indication error of the tested table 13 based on the data of each sub-interval collected by the high-speed data acquisition and processing module.

[0028] Taking a gas meter of model G2.5 as an example, with a working medium temperature of 40℃, a gas meter operating temperature of 20℃, and a standard temperature of 20℃, and using 0.4m... 3 Using / h as an example of the test flow rate, the following explanation will be provided: Turn on the high-pressure gas source 1 and start the gas filtration and drying device 2. Adjust the pressure regulating valve 4 to make the output pressure of the gas storage tank 3 reach 2 kPa. Close the medium inlet control valve 5 and the test instrument outlet control valve 14. The medium inlet three-way valve 6 connects to the inlet of the medium heat exchanger 7 and the outlet of the medium recovery insulation pipe 9. The test instrument inlet control three-way valve 12 connects to the outlet of the medium outlet insulation pipe 8 and the inlet of the medium recovery insulation pipe 9. Start the medium temperature control chamber 10 so that the temperature detected by the temperature sensor of the medium temperature control chamber reaches the test medium temperature of 40℃; start the working environment temperature control chamber 11 of the gas meter under test so that the temperature detected by the temperature sensor of the working environment temperature control chamber of the gas meter reaches the working temperature of the test gas meter of 20℃; start the standard ambient temperature control chamber 17 so that the temperature detected by the temperature sensor of the nozzle standard temperature control chamber reaches the working temperature of the standard of 20℃. Wait until the temperature inside all temperature control chambers reaches the corresponding test temperature and remains stable at that temperature for 2 hours. Open the medium inlet control valve 5 and the test gauge outlet control valve 14. The medium inlet three-way valve 6 connects the outlet of the medium inlet control valve to the inlet of the medium heat exchanger 7. The test gauge inlet control three-way valve 12 connects the outlet of the medium outlet insulation pipe 8 to the inlet of the test gauge 13. Stop the nozzle standard 16 and vacuum pump 18, close the medium inlet control valve 5 and the test instrument outlet control valve 14, the medium inlet three-way valve 6 connects the inlet of the medium heat exchanger 7 and the outlet of the medium recovery insulation pipe 9, and the test instrument inlet control three-way valve 12 connects the outlet of the medium outlet insulation pipe 8 and the inlet of the medium recovery insulation pipe 9. After the temperature of the medium is adjusted by the temperature control box 10, the medium enters the test instrument 13 through the medium outlet insulation pipe 8. After flowing through the test instrument 13, it enters the nozzle standard 16 for flow test, and the high-speed data acquisition and processing module is started to collect data of each sub-interval.

[0029] Stop the nozzle standard 16 and vacuum pump 18, close the medium inlet control valve 5 and the test instrument outlet control valve 14, the medium inlet three-way valve 6 connects the inlet of the medium heat exchanger 7 and the outlet of the medium recovery insulation pipe 9, and the test instrument inlet control three-way valve 12 connects the outlet of the medium outlet insulation pipe 8 and the inlet of the medium recovery insulation pipe 9. Once the temperature inside all the temperature control chambers reaches the corresponding test temperature, and stabilizes at that temperature for the preset recovery time; Repeat the above steps, and finally calculate the indication error of the tested table 13 based on the data of each sub-interval collected by the high-speed data acquisition and processing module.

[0030] The advantages of this utility model are: 1. This utility model uses three temperature control chambers to precisely adjust and control the temperature of the medium, the working environment temperature of the instrument under test, and the ambient temperature of the standard instrument, respectively, to prevent mutual interference and meet the different test temperature requirements of the three, thereby realizing the test requirements of the working medium temperature and the working environment temperature of the instrument under test under different temperature conditions.

[0031] 2. This utility model achieves control over the gas path during the test process by adding a medium inlet control valve, a test gauge outlet control valve, a medium inlet three-way valve, and a test gauge inlet control three-way valve. The entire test process is divided into several sub-sections, each containing an execution phase and a recovery phase. By utilizing valve control, the test duration of a single execution phase is shortened, and the temperature recovery time is extended, reducing the impact of heat exchange between the medium and the gas meter on the test.

[0032] 3. This utility model achieves the recovery of the medium by adding a medium recovery insulation pipe between the medium heat exchanger and the air inlet of the instrument under test, so that the working medium temperature can quickly rise back to the test temperature during the recovery phase.

[0033] 4. This utility model utilizes the air inlet temperature sensor, air inlet pressure sensor, nozzle standard temperature sensor, and nozzle standard pressure sensor to achieve high-speed synchronous acquisition and processing of temperature and pressure data during the test. It simultaneously analyzes the medium temperature, the working environment temperature of the tested instrument, the standard temperature, and the flow rate data, effectively eliminating cross-interference between temperature and flow rate, thereby achieving accurate measurement of the standard volume during the test.

Claims

1. A flow test device with adjustable medium temperature and ambient temperature, characterized in that... It includes a high-pressure gas source (1), a gas filtration and drying device (2), a gas storage tank (3), a pressure regulating valve (4), a medium inlet control valve (5), a medium temperature control box (10), a working environment temperature control box for the instrument under test (11), a standard instrument environment temperature control box (17), and a vacuum pump (18). The high-pressure gas source (1) is connected in sequence to the gas filtration and drying device (2), the gas storage tank (3) and the pressure regulating valve (4), and the outlet of the pressure regulating valve (4) is connected to the inlet of the medium inlet control valve (5); The medium temperature control box (10) is equipped with a medium heat exchanger (7) and a medium inlet three-way valve (6). One inlet of the medium inlet three-way valve (6) is connected to the outlet of the medium inlet control valve (5), and the other inlet of the medium inlet three-way valve (6) is connected to the outlet of the medium recovery insulation pipe (9). The outlet of the medium inlet three-way valve (6) is connected to the inlet of the medium heat exchanger (7). The outlet of the medium heat exchanger (7) is connected to the inlet of the medium outlet insulation pipe (8). The outlet of the medium outlet insulation pipe (8) passes through the medium temperature control box (10) and the working environment temperature control box (11) of the meter under test and is connected to one inlet of the inlet control three-way valve (12) of the meter under test. The test instrument working environment temperature control box (11) is equipped with a test instrument inlet control three-way valve (12), a test instrument outlet control valve (14) and a test instrument (13). One outlet of the test instrument inlet control three-way valve (12) is connected to the inlet of the medium recovery insulation pipe (9), and the other outlet of the test instrument inlet control three-way valve (12) is connected to the inlet of the test instrument (13). The inlet of the test instrument outlet control valve (14) is connected to the outlet of the test instrument (13). The outlet of the test instrument outlet control valve (14) passes through the test instrument working environment temperature control box (11) and the standard instrument environment temperature control box (17) and is connected to the inlet of the nozzle standard heat exchanger (15). The outlet of the nozzle standard heat exchanger (15) is connected to the inlet of the nozzle standard (16). The outlet of the nozzle standard (16) is connected to the vacuum pump (18). The heat exchanger (15) and nozzle standard (16) for the nozzle standard are installed inside the ambient temperature control box (17) of the standard.

2. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... The medium temperature control box (10), the working environment temperature control box (11) of the test instrument, and the standard environment temperature control box (17) are each independently temperature controlled to adjust the working medium temperature, the working environment temperature of the test instrument, and the working environment temperature of the nozzle standard, respectively.

3. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... The air inlet of the test instrument (13) is equipped with a test instrument inlet temperature sensor Tm and a test instrument inlet pressure sensor Pm.

4. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... The nozzle standard (16) is equipped with a nozzle standard temperature sensor TR and a nozzle standard pressure sensor PR.

5. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... The medium temperature control box (10) is equipped with a medium temperature control box temperature sensor Tg.

6. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... The gas meter working environment temperature control box (11) is equipped with a gas meter working environment temperature sensor TA.

7. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... The nozzle standard temperature control box (17) is equipped with a nozzle standard temperature control box temperature sensor TS.

8. The flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... A vacuum pump pressure sensor P is installed between the nozzle standard (16) and the vacuum pump (18).

9. A flow test device with adjustable medium temperature and ambient temperature according to claim 1, characterized in that... Both the medium outlet insulation pipe (8) and the medium recovery insulation pipe (9) are stainless steel pipes with insulation layers.

10. The flow testing device according to claim 1, characterized in that... The gas filtration and drying device (2) is a refrigerated dryer used to remove oil and water vapor from the gas source.

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