A kind of SF 6 Air chamber weighing and filling and deflation measuring device

Abstract

A kind of SF 6 Air chamber weighing filling and deflation measuring device, belonging to SF 6 In the field of equipment technology, how to design a SF with simple structure and easy installation 6 Gas chamber weighing filling and deflation measuring device, accurately measuring the original SF in the gas chamber of electrical equipment 6 Gas volume; Use this device to measure the SF 6 When measuring the amount of gas in the gas chamber, when SF 6 When the pressure in the air chamber is high, deflation measurement is performed. 6 When the pressure in the air chamber is low, the inflation measurement is performed; the measuring device cannot measure the SF in two situations at the same time 6 The pressure in the air chamber; it has a wide range of applications, simple device structure and easy installation.

Description

Technical Field

[0001] The present invention belongs to SF 6 The technical field of equipment particularly relates to a SF 6 Air chamber weighing and filling and deflation measuring device. Background Art

[0002] Sulfur hexafluoride (SF 6 ) gas has been widely used in high and medium voltage electrical equipment due to its excellent insulation and arc extinguishing properties. According to statistics, sulfur hexafluoride (SF 6 ) gas production is about 20,000 tons, about 80% of which is used in the power industry. With the large-scale construction and commissioning of AC / DC UHV projects, SF 6 The amount of gas used is increasing. 6 The greenhouse effect of gas is CO 2 It is more than 23,900 times the concentration of carbon dioxide, can exist in the air for more than 3,200 years, and is one of the six gases banned from emission under the Kyoto Protocol.

[0003] There are a huge number of sulfur hexafluoride electrical equipment in the power industry. Most of the equipment in operation does not have the gas consumption and equipment volume marked on the nameplate (the equipment contains a variety of complex structures, which are difficult to estimate by appearance). 6 The gas filling volume is unknown; the SF 6 The gas filling volume is inaccurate, and the actual operating pressure is generally higher than the rated pressure value. Therefore, it is difficult to obtain accurate data on the sulfur hexafluoride gas consumption of electrical equipment, and the gas recovery rate cannot be controlled during equipment maintenance and decommissioning, and the recovery rate often fails to meet the standard. In order to control and reduce sulfur hexafluoride gas emissions, a working mode of "decentralized recovery, centralized treatment, unified testing, and recycling" has been formed, realizing the recovery, recharging and purification of sulfur hexafluoride gas on site.

[0004] In the prior art, the Chinese invention patent "A SF 6 Gas Metering Devices, such as Figure 2 As shown, it specifically includes a weighing device 1, a mass flow meter 2, a self-sealing joint 3, a connector 4, a pressure regulating needle valve 5, a first pressure gauge 6, a second pressure gauge 7, a heating device 8, and a gas cylinder 9. The device can obtain data such as the weight of the gas cylinder, the gas flow, the temperature of the cylinder, and the equipment pressure before and after the operation in real time, so as to realize the SF 6 Real-time monitoring and management of electrical equipment filling and replenishing data and gas cylinder usage. If the device is used to fill and replenish the vacuum chamber, the weighing device can be used to determine whether there is SF in the chamber after the gas is replenished. 6 The amount of gas.

[0005] Disadvantages of the existing technology: SF 6 When measuring the volume in the air chamber, there is SF 6 The pressure in the air chamber is too high or too low. 6 When the pressure in the air chamber is too high, it needs to be deflated. 6 When the pressure in the air chamber is low, it needs to be inflated; the above device can only inflate the SF 6 The air chamber is inflated for measurement, and the SF in two situations cannot be measured at the same time 6 The pressure inside the air chamber.

[0006] Therefore, how to design a simple structure, easy installation, and 6 When the pressure in the air chamber is too low or too high, the air is inflated and deflated respectively to accurately measure the original SF in the air chamber of the electrical equipment. 6 The amount of gas has become a difficult problem that needs to be solved urgently. Summary of the invention

[0007] The purpose of this invention is to design a SF 6 Gas chamber weighing filling and deflation measuring device, accurately measuring the original SF in the gas chamber of electrical equipment 6 Gas volume.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] A kind of SF 6 An air chamber weighing filling and deflation measuring device comprises a first electric valve (1), a pressure gauge (2), a temperature sensor (7), a pressure sensor (8), a first flow regulating valve (9), a deflation tank (10), a first weighing sensor (11), a second flow regulating valve (12), a buffer tank (13), a fourth electric valve (14), a compressor (15), a refrigeration unit (16), a third flow regulating valve (17), a SF 6 The first electric valve (1), the pressure gauge (2), the temperature sensor (7), the pressure sensor (8), the first flow regulating valve (9), the air release tank (10), the second flow regulating valve (12), the buffer tank (13), the compressor (15), and the refrigeration unit (16) are connected in series and sealed in sequence; the first weighing sensor (11) is installed below the air release tank (10); one end of the fourth electric valve (14) is sealed between the buffer tank (13) and the compressor (15), and the other end of the fourth electric valve (14) is sealed to the output end of the refrigeration unit (16); the second weighing sensor (19) is installed at the SF 6 The bottom of the steel cylinder (18); the SF 6The steel cylinder (18) is sealed and connected between the pressure gauge (2) and the temperature sensor (7) via a third flow regulating valve (17).

[0010] Use this device to detect the SF 6 When measuring the amount of gas in the gas chamber, when SF 6 When the pressure in the air chamber is high, deflation measurement is performed. 6 When the pressure in the air chamber is low, the inflation measurement is performed; the measuring device cannot measure the SF in two situations at the same time 6 The pressure in the air chamber; it has a wide range of applications, simple device structure and easy installation.

[0011] As a further improvement of the technical solution of the present invention, it also includes a second electric valve (3), a vacuum pump (4), a third electric valve (5), and a vacuum gauge (6); the second electric valve (3) and the vacuum pump (4) are sealed in series, and the non-series end of the second electric valve (3) is sealed between the pressure gauge (2) and the temperature sensor (7); the third electric valve (5) and the vacuum gauge (6) are sealed in series, and the non-series end of the third electric valve (5) is sealed between the second electric valve (3) and the vacuum pump (4).

[0012] As a further improvement of the technical solution of the present invention, SF 6 When the gas volume in the gas chamber is measured by inflation, the first flow regulating valve (9) is always in a closed state, and the SF 6 The steel cylinder (18) controls the first electric valve (1) to open, the second electric valve (3) to close, the third flow regulating valve (17) to close, and the temperature sensor (7) and the pressure sensor (8) to detect the current SF 6 Temperature and pressure data in the air chamber; control the first electric valve (1) to close and the third flow regulating valve (17) to open. At this time, only the third flow regulating valve (17) is in the open state, and the second weighing sensor (19) measures SF 6 The mass of the steel cylinder (18); controls the first electric valve (1) to open, at which time SF 6 The gas in the cylinder (18) enters the SF 6 The air chamber, temperature sensor (7) and pressure sensor (8) detect the current SF 6 Real-time temperature and pressure data in the air chamber, SF 6 When the pressure in the air chamber approaches the set value, the third flow regulating valve (17) is controlled to slowly decrease until the SF 6 When the pressure in the air chamber reaches the set value, the third flow regulating valve (17) and the first electric valve (1) are completely closed; after the inflation is completed, the first electric valve (1) is controlled to open, and the temperature sensor (7) and the pressure sensor (8) detect the current SF 6The temperature and pressure data of the air chamber after inflation are measured by the second weighing sensor (19) to obtain SF 6 The mass of the steel cylinder (11), at this point all data measurements have been completed.

[0013] As a further improvement of the technical solution of the present invention, SF 6 When the gas volume in the gas chamber is measured by deflation, the third flow regulating valve (17) is always in a closed state, the first electric valve (1) is controlled to be opened, and the second electric valve (3) and the first flow regulating valve (9) are closed; the temperature sensor (7) and the pressure sensor (8) detect the current SF 6 Temperature and pressure data in the air chamber;

[0014] The first electric valve (1) is controlled to be closed, and the first flow regulating valve (9) is fully opened, at which time only the first flow regulating valve (9) is in an open state, and the first weighing sensor (11) measures the tank body mass of the deflation tank (10) before deflation;

[0015] The first electric valve (1) is controlled to open. At this time, SF 6 The gas in the air chamber enters the air release tank (10), and the temperature sensor (7) and the pressure sensor (8) detect the current SF 6 Real-time temperature and pressure data in the air chamber, SF 6 When the pressure in the air chamber approaches the set value, the first flow regulating valve (9) is controlled to slowly decrease until the SF 6 When the pressure in the air chamber reaches a set value, the first flow regulating valve (9) and the first electric valve (1) are completely closed;

[0016] After deflation is completed, the first electric valve (1) is controlled to open, the temperature sensor (7) and the pressure sensor (8) detect the temperature and pressure data in the current air chamber, and after the detection data are stable, the first electric valve (1) is controlled to close, the first flow regulating valve (9) is opened to the maximum, and the first weighing sensor (11) measures the mass of the deflation tank (10) after deflation.

[0017] As a further improvement of the technical solution of the present invention, after the measurement is completed, the released gas needs to be discharged from the device as waste gas, and a waste gas cylinder is connected at C, and the compressor (15) and the refrigeration unit (16) are turned on in sequence, and the first flow regulating valve (9) and the second flow regulating valve (12) are opened to the maximum state. The first electric valve (1), the second electric valve (3), and the third electric valve (5) in the device are all in the closed state, and the gas in the device is pumped into the waste gas cylinder through the compressor (15) and the refrigeration unit (16).

[0018] As a further improvement of the technical solution of the present invention, before the device is used, the device body is evacuated, an exhaust pipe is connected at B, the first electric valve (1) and the third flow regulating valve (17) are closed, and the second electric valve (3), the third electric valve (5), the fourth electric valve (14), the first flow regulating valve (9), the second flow regulating valve (12) and the vacuum gauge (6), and the vacuum pump (4) are opened in sequence, all pipelines in the device are connected, and the vacuum pump (4) starts to evacuate the device body until the vacuuming work is completed.

[0019] As a further improvement of the technical solution of the present invention, the model of the first weighing sensor (11) and the second weighing sensor (19) is NTJH-4M; the model of the pressure gauge (2) is Y-60BFZ.

[0020] As a further improvement of the technical solution of the present invention, the temperature sensor (7) adopts the TJ36-CASS-116U-6 temperature sensor of OMEGA Company; the pressure sensor (8) adopts the PX409-series pressure sensor of OMEGA Company.

[0021] As a further improvement of the technical solution of the present invention, the first electric valve (1), the second electric valve (3), the third electric valve (5), and the fourth electric valve (14) are all Q911F-16S electric UPVC ball valves; the first flow regulating valve (9), the second flow regulating valve (12), and the third flow regulating valve (17) are of model AOX-L.

[0022] As a further improvement of the technical solution of the present invention, the vacuum gauge (6) adopts a German PPT20 vacuum gauge, and the model of the vacuum pump (4) is 2RH090C.

[0023] The advantages of the present invention are:

[0024] (1) Use this device to detect the SF 6 When measuring the amount of gas in the gas chamber, when SF 6 When the pressure in the air chamber is high, deflation measurement is performed. 6 When the pressure in the air chamber is low, the inflation measurement is performed; the measuring device cannot measure the SF in two situations at the same time 6 The pressure in the air chamber; it has a wide range of applications, simple device structure and easy installation.

[0025] (2) The electric valve adopts Q911F-16S electric UPVC ball valve. This type of electric valve is light and simple, has long-lasting and stable performance, is waterproof, rust-proof and dust-proof, can be installed at any angle, adopts UPVC corrosion-resistant valve body, has a torque of 1 / 4 of that of traditional ball valve, and rotates smoothly.

[0026] (3) The manual valve adopts Q41F-16P stainless steel flange ball valve, which is easy to install, made of stainless steel, and is resistant to pressure, corrosion and high temperature.

[0027] (4) The model of the pressure gauge is Y-60BFZ. This type of pressure gauge is suitable for severe vibration environments, can withstand pulsating media and impact loads, is suitable for corrosive gas environments, can detect the pressure or vacuum of highly corrosive media, and the pressure gauge indication is stable and clear.

[0028] (5) The model of the vacuum pump is 2RH090C. The first cylinder is located outside the body of the vacuum pump, which has fast heat dissipation. It adopts a spring-free vane and forced oil supply method, which has stable exhaust performance. The hydraulic oil check structure solves the problem of power failure or accidental pump stop, in which the pump oil flows back into the pump body and causes difficulty in restarting. The variable oil volume method expands the oil volume indication range.

[0029] (6) The temperature sensor uses the TJ36-CASS-116U-6 temperature sensor from OMEGA, which has high measurement accuracy.

[0030] (7) The pressure sensor adopts the PX409 series pressure sensor of OMEGA. This type of pressure sensor has a full stainless steel structure, a standard thread pressure measurement method, a constant current source power supply, and laser resistance adjustment to compensate for zero point and temperature performance.

[0031] (8) The model of the flow control valve is AOX-L. The flow control valve body of this model has a compact structure, an S-shaped fluid channel, small pressure drop loss, large flow rate and a wide adjustable range.

[0032] (9) The vacuum gauge uses the German PPT20 vacuum gauge. The signal received by this type of vacuum gauge can be a digital signal or an analog signal. It has a wide vacuum measurement range, is corrosion-resistant, and has high accuracy.

[0033] (10) The model of the weighing sensor is NTJH-4M. This type of weighing sensor has low height, good rigidity, high precision and strong anti-eccentric load capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a SF of the embodiment of the present invention. 6 Structural diagram of the air chamber weighing and filling and deflation measuring device.

[0035] Figure 2 It is a structural diagram of a measuring device in the prior art. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0038] Embodiment 1

[0039] like Figure 1 As shown, a SF 6 The gas chamber weighing charging and discharging measuring device includes a first electric valve 1, a pressure gauge 2, a second electric valve 3, a vacuum pump 4, a third electric valve 5, a vacuum gauge 6, a temperature sensor 7, a pressure sensor 8, a first flow regulating valve 9, a deflation tank 10, a first weighing sensor 11, a second flow regulating valve 12, a buffer tank 13, a fourth electric valve 14, a compressor 15, a refrigeration unit 16, a third flow regulating valve 17, a SF 6 The steel cylinder 18 and the second weighing sensor 19; the first electric valve 1, the pressure gauge 2, the temperature sensor 7, the pressure sensor 8, the first flow regulating valve 9, the air release tank 10, the second flow regulating valve 12, the buffer tank 13, the compressor 15, and the refrigeration unit 16 are connected in series and sealed in sequence; the first weighing sensor 11 is installed below the air release tank 10; the second electric valve 3 is connected in series and sealed with the vacuum pump 4, and the non-series end of the second electric valve 3 is sealed between the pressure gauge 2 and the temperature sensor 7; the third electric valve 5 is connected in series and sealed with the vacuum gauge 6, and the non-series end of the third electric valve 5 is sealed between the second electric valve 3 and the vacuum pump 4; one end of the fourth electric valve 14 is sealed between the buffer tank 13 and the compressor 15, and the other end of the fourth electric valve 14 is sealed at the output end of the refrigeration unit 16; the second weighing sensor 19 is installed at the SF 6 Below the cylinder 18; the SF 6 The steel cylinder 18 is sealed and connected between the pressure gauge 2 and the temperature sensor 7 through the third flow regulating valve 17 .

[0040] When the device is in use, the A of the device is in contact with the SF 6 The B part of the device is directly connected to the outside during use, the C part of the device is connected to the waste gas cylinder during use, and the D part of the device is connected to the SF 6The first electric valve 1, the second electric valve 3, the third electric valve 5, and the fourth electric valve 14 are used to control the direction of the gas in the device; the pressure gauge 2 is used to observe the SF during the filling and discharging process. 6 Pressure changes in the air chamber; vacuum pump 4 and vacuum gauge 6 are used to evacuate the device body and detect the vacuum degree; temperature sensor 7 and pressure sensor 8 are used to detect the temperature and pressure in the air chamber of the device and electrical equipment; the gas release tank 10 is used for SF 6 Deflation of the air chamber; the first weighing sensor 11 is used to detect the mass change in the deflation tank 10; the first flow regulating valve 9, the second flow regulating valve 12 and the third flow regulating valve 17 are used to control the gas flow; the buffer tank 13, the compressor 15, and the refrigeration unit 16 are used to discharge the exhaust gas in the device.

[0041] The first electric valve 1, the second electric valve 3, the third electric valve 5, and the fourth electric valve 14 all adopt Q911F-16S electric UPVC ball valve. This type of electric valve is light and simple, has long-lasting and stable performance, is waterproof, rust-proof, and dust-proof, can be installed at any angle, adopts UPVC corrosion-resistant valve body, has a torque of 1 / 4 of that of traditional ball valve, and rotates smoothly.

[0042] The model of the pressure gauge 2 is Y-60BFZ, which is suitable for severe vibration environments, resistant to pulsating media and impact loads, and suitable for corrosive gas environments. It can detect the pressure or vacuum of highly corrosive media, and the pressure gauge indication is stable and clear.

[0043] The model of the vacuum pump 4 is 2RH090C. This model of vacuum pump adopts the method of placing the first cylinder outside the body, which has fast heat dissipation; adopts the method of spring-free vane and forced oil supply, which has stable exhaust performance; the hydraulic oil check structure solves the problem of difficulty in restarting caused by power outage or accidental pump stop due to pump oil backflow into the pump body; the variable oil quantity method expands the oil quantity indication range.

[0044] The temperature sensor 7 is a TJ36-CASS-116U-6 temperature sensor from OMEGA, which has high measurement accuracy.

[0045] The pressure sensor 8 is a PX409 series pressure sensor from OMEGA. This type of pressure sensor has a full stainless steel structure, a standard threaded pressure measurement method, a constant current source power supply, and laser resistance adjustment to compensate for zero point and temperature performance.

[0046] The model of the first flow regulating valve 9, the second flow regulating valve 12 and the third flow regulating valve 17 is AOX-L, which has a compact valve body structure, an S-shaped streamlined fluid channel, a small pressure drop loss, a large flow rate and a wide adjustable range.

[0047] The vacuum gauge 6 adopts the German PPT20 vacuum gauge. The signal received by this type of vacuum gauge can be a digital signal or an analog signal. It has a wide vacuum measurement range, is corrosion-resistant, and has high precision.

[0048] The model of the first weighing sensor 11 and the second weighing sensor 19 is NTJH-4M. This type of weighing sensor has low height, good rigidity, high precision and strong anti-eccentric load capacity.

[0049] 1. SF 6 When the gas volume in the gas chamber is measured by inflation method:

[0050] The first flow regulating valve 9 is always in the closed state, and the SF 6 The cylinder 18 controls the first electric valve 1 to open, the second electric valve 3 to close, and the third flow regulating valve 17 to close. The temperature sensor 7 and the pressure sensor 8 detect the current SF 6 Temperature and pressure data in the air chamber; control the first electric valve 1 to close and the third flow regulating valve 17 to open. At this time, only the third flow regulating valve 17 is in the open state, and the second weighing sensor 19 measures SF 6 The mass of the cylinder 18; control the first electric valve 1 to open, at this time SF 6 The gas in cylinder 18 enters the SF 6 The air chamber, temperature sensor 7 and pressure sensor 8 detect the current SF 6 Real-time temperature and pressure data in the air chamber, SF 6 When the pressure in the air chamber approaches the set value, the third flow regulating valve 17 is controlled to decrease slowly until the SF 6 When the pressure in the air chamber reaches the set value, the third flow regulating valve 17 and the first electric valve 1 are completely closed; after the inflation is completed, the first electric valve 1 is controlled to open, and the temperature sensor 7 and the pressure sensor 8 detect the current SF 6 The temperature and pressure data of the air chamber after inflation are measured by the second weighing sensor 19 to obtain SF 6 The quality of the steel cylinder 11, at this point all the data has been measured.

[0051] 2. SF 6 When the gas volume in the gas chamber is measured by deflation:

[0052] The third flow regulating valve 17 is always in the closed state, controlling the first electric valve 1 to open, and the second electric valve 3 and the first flow regulating valve 9 to close; the temperature sensor 7 and the pressure sensor 8 detect the current SF 6 Temperature and pressure data in the air chamber.

[0053] The first electric valve 1 is controlled to be closed, and the first flow regulating valve 9 is fully opened. At this time, only the first flow regulating valve 9 is in an open state, and the first weighing sensor 11 measures the tank body mass of the deflation tank 10 before deflation.

[0054] Control the first electric valve 1 to open. At this time, SF 6 The gas in the air chamber enters the gas release tank 10, and the temperature sensor 7 and the pressure sensor 8 detect the current SF 6 Real-time temperature and pressure data in the air chamber, SF 6 When the pressure in the air chamber approaches the set value, the first flow regulating valve 9 is controlled to decrease slowly until the SF 6 When the pressure in the air chamber reaches the set value, the first flow regulating valve 9 and the first electric valve 1 are completely closed.

[0055] After deflation is completed, the first electric valve 1 is controlled to open, and the temperature sensor 7 and the pressure sensor 8 detect the temperature and pressure data in the current air chamber. After the detection data is stable, the first electric valve 1 is controlled to close, the first flow regulating valve 9 is opened to the maximum, and the first weighing sensor 11 measures the mass of the deflation tank 10 after deflation.

[0056] After the measurement, the released gas needs to be discharged out of the device as waste gas. Connect the waste gas cylinder at C, turn on the compressor 15 and the refrigeration unit 16 in turn, open the first flow regulating valve 9 and the second flow regulating valve 12 to the maximum state, and the first electric valve 1, the second electric valve 3, and the third electric valve 5 in the device are all in the closed state. The gas in the device is pumped into the waste gas cylinder through the compressor 15 and the refrigeration unit 16.

[0057] Before the device is used, if it is necessary to evacuate the device body, connect the exhaust pipe at B, close the first electric valve 1 and the third flow regulating valve 17, and open the second electric valve 3, the third electric valve 5, the fourth electric valve 14, the first flow regulating valve 9, the second flow regulating valve 12, the vacuum gauge 6, and the vacuum pump 4 in sequence. All pipelines in the device are connected, and the vacuum pump 4 starts to evacuate the device body until the vacuuming work is completed.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A kind of SF 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that The invention comprises a first electric valve (1), a pressure gauge (2), a temperature sensor (7), a pressure sensor (8), a first flow regulating valve (9), a gas release tank (10), a first weighing sensor (11), a second flow regulating valve (12), a buffer tank (13), a fourth electric valve (14), a compressor (15), a refrigeration unit (16), a third flow regulating valve (17), a SF 6 The steel cylinder (18) and the second weighing sensor (19) are provided. The first electric valve (1), the pressure gauge (2), the temperature sensor (7), the pressure sensor (8), the first flow regulating valve (9), the air release tank (10), the second flow regulating valve (12), the buffer tank (13), the compressor (15), and the refrigeration unit (16) are connected in series and sealed in sequence. The first weighing sensor (11) is installed below the air release tank (10). One end of the fourth electric valve (14) is sealed between the buffer tank (13) and the compressor (15), and the other end of the fourth electric valve (14) is sealed to the output end of the refrigeration unit (16). The second weighing sensor (19) is installed on the SF 6 The bottom of the cylinder (18); the SF 6 The steel cylinder (18) is sealedly connected between the pressure gauge (2) and the temperature sensor (7) via a third flow regulating valve (17).

2. A SF according to claim 1 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that The device further comprises a second electric valve (3), a vacuum pump (4), a third electric valve (5), and a vacuum gauge (6); the second electric valve (3) and the vacuum pump (4) are sealedly connected in series, and the non-series end of the second electric valve (3) is sealedly connected between the pressure gauge (2) and the temperature sensor (7); the third electric valve (5) and the vacuum gauge (6) are sealedly connected in series, and the non-series end of the third electric valve (5) is sealedly connected between the second electric valve (3) and the vacuum pump (4).

3. A SF according to claim 2 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that About SF 6 When the gas volume in the gas chamber is measured by inflation, the first flow regulating valve (9) is always in the closed state, and the SF 6 The cylinder (18) controls the first electric valve (1) to open, the second electric valve (3) to close, and the third flow regulating valve (17) to close. The temperature sensor (7) and the pressure sensor (8) detect the current SF 6 Temperature and pressure data in the air chamber; control the first electric valve (1) to close and the third flow regulating valve (17) to open. At this time, only the third flow regulating valve (17) is in an open state, and the second weighing sensor (19) measures SF 6 The mass of the steel cylinder (18); controls the first electric valve (1) to open, at which time SF 6 The gas in the cylinder (18) enters the SF 6 The air chamber, temperature sensor (7) and pressure sensor (8) detect the current SF 6 Real-time temperature and pressure data in the air chamber, SF 6 When the pressure in the air chamber approaches the set value, the third flow regulating valve (17) is controlled to slowly decrease until the SF 6 When the pressure in the air chamber reaches a set value, the third flow regulating valve (17) and the first electric valve (1) are completely closed; after the inflation is completed, the first electric valve (1) is controlled to open, and the temperature sensor (7) and the pressure sensor (8) detect the current SF 6 The temperature and pressure data of the air chamber after inflation are measured by the second weighing sensor (19) to obtain SF 6 The mass of the steel cylinder (11). At this point, all data measurements have been completed.

4. A SF according to claim 2 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that About SF 6 When the gas volume in the gas chamber is measured by deflation, the third flow control valve (17) is always in a closed state, the first electric valve (1) is controlled to be opened, and the second electric valve (3) and the first flow control valve (9) are closed; the temperature sensor (7) and the pressure sensor (8) detect the current SF 6 Temperature and pressure data in the air chamber; The first electric valve (1) is controlled to be closed, and the first flow regulating valve (9) is fully opened, at which time only the first flow regulating valve (9) is in an open state, and the first weighing sensor (11) measures the mass of the gas release tank (10) before gas release; The first electric valve (1) is controlled to open. At this time, SF 6 The gas in the air chamber enters the air release tank (10), and the temperature sensor (7) and the pressure sensor (8) detect the current SF 6 Real-time temperature and pressure data in the air chamber, SF 6 When the pressure in the air chamber approaches the set value, the first flow regulating valve (9) is controlled to slowly decrease until the SF 6 When the pressure in the air chamber reaches a set value, the first flow regulating valve (9) and the first electric valve (1) are completely closed; After deflation is completed, the first electric valve (1) is controlled to open, the temperature sensor (7) and the pressure sensor (8) detect the temperature and pressure data in the current air chamber, and after the detection data are stable, the first electric valve (1) is controlled to close, the first flow regulating valve (9) is opened to the maximum, and the first weighing sensor (11) measures the mass of the deflation tank (10) after deflation.

5. A SF according to claim 4 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that After the measurement is completed, the released gas needs to be discharged from the device as waste gas. A waste gas cylinder is connected at C, and the compressor (15) and the refrigeration unit (16) are turned on in sequence. The first flow regulating valve (9) and the second flow regulating valve (12) are opened to the maximum state. The first electric valve (1), the second electric valve (3) and the third electric valve (5) in the device are all in the closed state. The gas in the device is pumped into the waste gas cylinder through the compressor (15) and the refrigeration unit (16).

6. A SF according to claim 4 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that Before the device is used, the device body is evacuated, an exhaust pipe is connected at point B, the first electric valve (1) and the third flow regulating valve (17) are closed, and the second electric valve (3), the third electric valve (5), the fourth electric valve (14), the first flow regulating valve (9), the second flow regulating valve (12) and the vacuum gauge (6) and the vacuum pump (4) are opened in sequence, all pipelines in the device are connected, and the vacuum pump (4) starts to evacuate the device body until the evacuation work is completed.

7. The SF according to claim 1 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that The model of the first weighing sensor (11) and the second weighing sensor (19) is NTJH-4M; the model of the pressure gauge (2) is Y-60BFZ.

8. The SF according to claim 1 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that The temperature sensor (7) is a TJ36-CASS-116U-6 temperature sensor from OMEGA; the pressure sensor (8) is a PX409 series pressure sensor from OMEGA.

9. The SF according to claim 2 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that The first electric valve (1), the second electric valve (3), the third electric valve (5), and the fourth electric valve (14) are all Q911F-16S electric UPVC ball valves; the first flow regulating valve (9), the second flow regulating valve (12), and the third flow regulating valve (17) are of AOX-L model.

10. The SF according to claim 2 6 Air chamber weighing and filling and deflation measuring device, It is characterized in that The vacuum gauge (6) is a German PPT20 vacuum gauge, and the vacuum pump (4) is of model 2RH090C.

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