A SF6 gas chamber constant volume filling and discharging measurement device

Abstract

The invention relates to a SF6 gas chamber constant volume filling and discharging measuring device, which belongs to the technical field of SF6 equipment and solves the problem of how to design a device that can accurately measure the gas volume in the SF6 gas chamber when the pressure in the SF6 gas chamber is low or high. When the device of the invention is used to measure the gas volume in the SF6 gas chamber of an electrical device, when the pressure in the SF6 gas chamber is high, the deflation measurement is performed, and when the pressure in the SF6 gas chamber is low, the inflation measurement is performed. The measuring device cannot measure the pressure in the SF6 gas chamber in two situations at the same time. It has a wide range of applications. A constant volume filling and discharging gas tank is used to replace a weighing device, and a set of temperature and pressure sensors and a control valve group are used to realize temperature and pressure measurement under different conditions. There is no need to carry a weighing device to the site to weigh the gas cylinder. The device has a simple structure and is easy to install.

Description

Technical Field

[0001] The invention belongs to the technical field of SF6 equipment, and in particular relates to a constant-volume filling and discharging measuring device for an SF6 gas chamber. Background Art

[0002] Sulfur hexafluoride (SF6) gas has been widely used in high and medium voltage electrical equipment due to its excellent insulation and arc extinguishing properties. According to statistics, the global annual production of sulfur hexafluoride (SF6) gas is about 20,000 tons, and about 80% is used in the power industry. With the large-scale construction and commissioning of AC / DC UHV projects, the consumption of SF6 gas is increasing. However, the greenhouse effect of SF6 gas is more than 23,900 times that of CO2, and it can exist in the air for more than 3,200 years. It is one of the six gases banned from emission in 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), and the SF6 gas filling volume is unknown; the SF6 gas filling volume marked on the nameplate of some newly commissioned equipment 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 does not 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" is formed to achieve on-site sulfur hexafluoride gas recovery, refilling and purification.

[0004] In the prior art, the Chinese utility model patent "A SF6 gas metering device" with application number 201821892226.7 and publication date of June 7, 2019, 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, and realize real-time monitoring and management of the filling and replenishing data of SF6 electrical equipment and the use of gas cylinders. If the device is used to fill and replenish the vacuum chamber, the amount of SF6 gas in the chamber after the gas is replenished can be determined according to the weighing device, and a SF6 chamber constant volume filling and discharging measuring device is required.

[0005] Disadvantages of the existing technology:

[0006] (1) When measuring the volume of the SF6 gas chamber of the operating electrical equipment, there is a situation where the pressure in the SF6 gas chamber is too high or too low. When the pressure in the SF6 gas chamber is too high, it needs to be deflated. When the pressure in the SF6 gas chamber is too low, it needs to be inflated. The above device can only measure the inflation of the SF6 gas chamber, and cannot measure the pressure in the SF6 gas chamber in both situations at the same time.

[0007] (2) The weighing device is used to determine the amount of SF6 gas filled, but the original amount of SF6 gas in the gas chamber cannot be known, nor can the internal volume of the gas chamber be effectively measured. Moreover, the weighing sensor is easily affected by external factors and has poor stability.

[0008] Therefore, how to design a device with simple structure, easy installation, and accurate measurement of the original SF6 gas amount in the gas chamber of electrical equipment by respectively inflating or deflating when the pressure in the SF6 gas chamber is low or high has become a problem that needs to be solved urgently. Summary of the invention

[0009] The purpose of the present invention is to design a device that can accurately measure the gas volume in an SF6 gas chamber when the pressure in the SF6 gas chamber is low or high.

[0010] The present invention solves the above technical problems through the following technical solutions:

[0011] A SF6 gas chamber constant volume charging and discharging measuring device, comprising a first manual valve (1), a first electric valve (2), a pressure gauge (3), a second electric valve (4), a vacuum pumping device, a temperature sensor (8), a pressure sensor (9), a first flow regulating valve (10), a constant volume charging and discharging tank (11), a second flow regulating valve (12), a buffer tank (13), a fourth electric valve (14), a compressor (15), a refrigeration unit (16), a second manual valve (17), and a third flow regulating valve (18); the first manual valve (1), the first electric valve (2), the pressure gauge (3), the temperature sensor (8), the pressure sensor (9), the first flow regulating valve (10), the constant volume charging and discharging tank (11), the second The 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 second electric valve (4) is connected in series and sealed in series with the vacuum pump, and the non-series end of the second electric valve (4) is connected in series and sealed between the pressure gauge (3) and the temperature sensor (8); one end of the fourth electric valve (14) is connected in series and sealed between the buffer tank (13) and the compressor (15), and the other end of the fourth electric valve (14) is connected in series and sealed to the output end of the refrigeration unit (16); the second manual valve (17) is connected in series and sealed in series with the third flow regulating valve (18), and the non-series end of the third flow regulating valve (18) is connected between the pressure gauge (3) and the temperature sensor (8).

[0012] When the device of the present invention is used to measure the amount of gas in the SF6 gas chamber of electrical equipment, when the pressure in the SF6 gas chamber is high, the deflation measurement is carried out, and when the pressure in the SF6 gas chamber is low, the inflation measurement is carried out; the measuring device cannot measure the pressure in the SF6 gas chamber in two situations at the same time; it has a wide range of applications; a constant volume charging and discharging gas tank is used to replace the weighing device, and a set of temperature and pressure sensors and a control valve group are used to realize temperature and pressure measurement under different conditions. There is no need to carry the weighing device to the site to weigh the gas cylinder, and the device has a simple structure and is easy to install.

[0013] As a further improvement of the technical solution of the present invention, the vacuum pumping device comprises a vacuum pump (5), a third electric valve (6), and a vacuum gauge (7); the second electric valve (4) is sealedly connected in series with the vacuum pump (5), and the non-series end of the second electric valve (4) is sealedly connected between the pressure gauge (3) and the temperature sensor (8); the third electric valve (6) is sealedly connected in series with the vacuum gauge (7), and the non-series end of the third electric valve (6) is sealedly connected between the second electric valve (4) and the vacuum pump (5).

[0014] As a further improvement of the technical solution of the present invention, before using the device, the device body is first vacuumed, the exhaust pipe is connected at B, the waste gas cylinder is connected at C, the first manual valve (1), the second manual valve (17) and the valve at the waste gas cylinder are closed, and then the first electric valve (2), the second electric valve (4), the third electric valve (6), the fourth electric valve (14) and the vacuum gauge (7) and the vacuum pump (5) are opened in sequence, all the pipelines in the device are connected, and the vacuum pump (5) starts to vacuum the device body until the vacuuming work is completed.

[0015] As a further improvement of the technical solution of the present invention, the method for performing inflation-type measurement of the gas volume in the SF6 gas chamber is:

[0016] The second flow regulating valve (12) is closed, the second manual valve (17) is opened, the first electric valve (2) and the second electric valve (4) are closed, the first flow regulating valve (10) and the third flow regulating valve (18) are opened to the maximum, an external SF6 steel cylinder is used to inflate the constant volume charging and discharging tank (11) to a set pressure value, and the temperature sensor (8) and the pressure sensor (9) detect the current temperature and pressure data in the constant volume charging and discharging tank (11);

[0017] Controlling the first flow regulating valve (10) and the third flow regulating valve (18) to close and the first electric valve (2) to open, where only the first electric valve (2) is in an open state, and the temperature sensor (8) and the pressure sensor (9) to detect current temperature and pressure data in the SF6 gas chamber;

[0018] The first flow regulating valve (10) is controlled to open slowly, and the gas in the constant volume gas charging and discharging tank (11) enters the SF6 gas chamber. The temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current gas chamber in real time. When the pressure in the gas chamber approaches the set value, the first flow regulating valve (10) is controlled to decrease slowly. When the pressure in the gas chamber reaches the set value, the first flow regulating valve (10) and the first electric valve (2) are completely closed, and the charging is completed.

[0019] After the inflation is completed, the first electric valve (2) is controlled to open, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current air chamber. After the detection data is stable, the first electric valve (2) is controlled to close; then the first flow regulating valve (10) is opened to the maximum, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current constant volume inflation and deflation tank (11). At this point, the test of all the data of the inflation measurement is completed.

[0020] As a further improvement of the technical solution of the present invention, the method for performing deflation measurement on the gas volume of the SF6 gas chamber is:

[0021] First, manually open the first manual valve (1), and the first electric valve (2), the second electric valve (4), the third electric valve (6), and the fourth electric valve (14) in the device are all in a closed state; control the first flow regulating valve (10) to open to the maximum, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current constant volume charging and discharging tank (11);

[0022] The first flow regulating valve (10) is controlled to be closed and the first electric valve (2) is controlled to be opened. At this time, the first manual valve (1) and the first electric valve (2) are in an open state, and the temperature sensor (8) and the pressure sensor (9) detect the current temperature and pressure data in the SF6 gas chamber;

[0023] The first flow regulating valve (10) is controlled to open slowly, and the gas in the SF6 gas chamber enters the constant volume charging and discharging gas tank (11). The temperature sensor (8) and the pressure sensor (9) detect the real-time temperature and pressure data in the current SF6 gas chamber. When the pressure in the SF6 gas chamber approaches the set value, the first flow regulating valve (10) is controlled to decrease slowly. When the pressure in the gas chamber reaches the set value, the first flow regulating valve (10) and the first electric valve (2) are completely closed.

[0024] After the deflation is completed, the first electric valve (2) is controlled to open, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current SF6 gas chamber. After the detection data is stable, the first electric valve (2) is controlled to close, the first flow regulating valve (10) is opened to the maximum, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current constant volume charging and discharging tank (11);

[0025] The released gas is discharged as waste gas outside the device, and a waste gas cylinder is connected at C. The compressor (15) and the refrigeration unit (16) are turned on in sequence, and the first flow regulating valve (10) and the second flow regulating valve (12) are opened to the maximum state. The first electric valve (2), the second electric valve (4), and the third electric valve (6) 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).

[0026] As a further improvement of the technical solution of the present invention, the first manual valve (1) and the second manual valve (17) are both Q41F-16P stainless steel flange ball valves.

[0027] As a further improvement of the technical solution of the present invention, the model of the pressure gauge (3) is Y-60BFZ.

[0028] As a further improvement of the technical solution of the present invention, the temperature sensor (8) adopts the TJ36-CASS-116U-6 temperature sensor of OMEGA Company; and the pressure sensor (9) adopts the PX409-series pressure sensor of OMEGA Company.

[0029] As a further improvement of the technical solution of the present invention, the model of the first flow regulating valve (10), the second flow regulating valve (12) and the third flow regulating valve (18) is AOX-L.

[0030] As a further improvement of the technical solution of the present invention, the first electric valve (2), the second electric valve (4), the third electric valve (6), and the fourth electric valve (14) are all Q911F-16S electric UPVC ball valves; the vacuum pump (5) is of model 2RH090C; and the vacuum gauge (7) is a German PPT20 vacuum gauge.

[0031] The advantages of the present invention are:

[0032] (1) When the device of the present invention is used to measure the amount of gas in the SF6 gas chamber of an electrical device, when the pressure in the SF6 gas chamber is high, the deflation measurement is performed, and when the pressure in the SF6 gas chamber is low, the filling measurement is performed; the measuring device cannot measure the pressure in the SF6 gas chamber in two situations at the same time; it has a wide range of applications; a constant volume charging and discharging gas tank is used to replace the weighing device, and a set of temperature and pressure sensors and a control valve group are used to achieve temperature and pressure measurement under different conditions. There is no need to carry a weighing device to the site to weigh the gas cylinder, and the device has a simple structure and is easy to install.

[0033] (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.

[0034] (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.

[0035] (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.

[0036] (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.

[0037] (6) The temperature sensor used is the TJ36-CASS-116U-6 temperature sensor from OMEGA, which has high measurement accuracy.

[0038] (7) The pressure sensor uses the 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.

[0039] (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.

[0040] (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 precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a SF6 gas chamber constant volume charging and discharging measuring device according to an embodiment of the present invention;

[0042] Figure 2 It is a structural diagram of the SF6 gas metering device in the prior art. DETAILED DESCRIPTION

[0043] 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.

[0044] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0045] Embodiment 1

[0046] like Figure 1 As shown, a SF6 gas chamber constant volume charging and discharging measuring device comprises a first manual valve 1, a first electric valve 2, a pressure gauge 3, a second electric valve 4, a vacuum pump 5, a third electric valve 6, a vacuum gauge 7, a temperature sensor 8, a pressure sensor 9, a first flow regulating valve 10, a constant volume charging and discharging tank 11, a second flow regulating valve 12, a buffer tank 13, a fourth electric valve 14, a compressor 15, a refrigeration unit 16, a second manual valve 17, and a third flow regulating valve 18; the first manual valve 1, the first electric valve 2, the pressure gauge 3, the temperature sensor 8, the pressure sensor 9, the first flow regulating valve 10, the constant volume charging and discharging tank 11, the second flow regulating valve 12, the buffer tank 13, the compressor 15, the refrigeration unit 16, the second manual valve 17, and the third flow regulating valve 18; The units 16 are sealed and connected in series in sequence; the second electric valve 4 is sealed and connected in series with the vacuum pump 5, and the non-series end of the second electric valve 4 is sealed and connected between the pressure gauge 3 and the temperature sensor 8; the third electric valve 6 is sealed and connected in series with the vacuum gauge 7, and the non-series end of the third electric valve 6 is sealed and connected between the second electric valve 4 and the vacuum pump 5; one end of the fourth electric valve 14 is sealed and connected between the buffer tank 13 and the compressor 15, and the other end of the fourth electric valve 14 is sealed and connected to the output end of the refrigeration unit 16; the second manual valve 17 is sealed and connected in series with the third flow regulating valve 18, and the non-series end of the third flow regulating valve 18 is connected between the pressure gauge 3 and the temperature sensor 8.

[0047] When in use, the SF6 gas chamber connector of the electrical equipment at A of the device is connected to measure the total amount of gas; B is directly connected to the outside world for exhausting the gas in the device; C is connected to the exhaust gas cylinder for exhausting the exhaust gas; D is connected to the SF6 cylinder for inflating the given volume filling and discharging tank 11; wherein, the first manual valve 1 is used to control the connection between the device and the external SF6 gas chamber; the pressure gauge 3 is used to observe the pressure change in the SF6 gas chamber during charging and discharging at all times during use; the first electric valve 2, the second electric valve 4, the third electric valve 6, and the fourth electric valve 14 are used to control the gas in the device The vacuum pump 5 and the vacuum gauge 7 are used to evacuate the device body and detect the vacuum degree; the temperature sensor 8 and the pressure sensor 9 are used to detect the temperature and pressure in the device and the SF6 gas chamber; the constant volume charging and discharging gas tank 11 is used to inflate the SF6 gas chamber or receive the gas discharged from the SF6 gas chamber; the first flow regulating valve 10, the second flow regulating valve 12, and the third flow regulating valve 18 are used to control the gas flow; the buffer tank 13 is used to buffer the gas at the front end of the compressor 15 when discharging the exhaust gas; the compressor 15 and the refrigeration unit 16 are used to discharge the exhaust gas in the device into the exhaust gas cylinder.

[0048] The first electric valve 2, the second electric valve 4, the third electric valve 6, 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 valves, and rotates smoothly.

[0049] The first manual valve 1 and the second manual valve 17 are both Q41F-16P stainless steel flange ball valves, which are easy to install, made of stainless steel, and are resistant to pressure, corrosion and high temperature.

[0050] The model of the pressure gauge 3 is Y-60BFZ, which is suitable for severe vibration environments, resistant to pulsating media and impact loads, suitable for corrosive gas environments, and can detect the pressure or vacuum of highly corrosive media. The pressure gauge indication is stable and clear.

[0051] The model of the vacuum pump 5 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 the pump oil flowing back into the pump body due to power outage or accidental pump stop; the variable oil quantity method expands the oil quantity indication range.

[0052] The temperature sensor 8 is a TJ36-CASS-116U-6 temperature sensor from OMEGA, which has high measurement accuracy.

[0053] The pressure sensor 9 adopts the PX409-series pressure sensor of OMEGA Company. 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.

[0054] The model of the first flow regulating valve 10, the second flow regulating valve 12 and the third flow regulating valve 18 is AOX-L, which has a compact valve body structure, an S-shaped fluid channel, a small pressure drop loss, a large flow rate and a wide adjustable range.

[0055] The vacuum gauge 7 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.

[0056] Before using the device, first, evacuate the device body, connect the exhaust pipe at B, connect the waste gas cylinder at C, close the first manual valve 1, the second manual valve 17 and the valve at the waste gas cylinder, then open the first electric valve 2, the second electric valve 4, the third electric valve 6, the fourth electric valve 14 and the vacuum gauge 7, the vacuum pump 5 in turn, all the pipelines in the device are connected, and the vacuum pump 5 starts to evacuate the device body until the vacuum work is completed.

[0057] 1. When measuring the gas volume in the SF6 gas chamber by inflation method:

[0058] Close the second flow regulating valve 12, open the second manual valve 17, close the first electric valve 2 and the second electric valve 4, open the first flow regulating valve 10 and the third flow regulating valve 18 to the maximum, and inflate the constant volume charging and discharging gas tank 11 with an external SF6 cylinder to the set pressure value. The temperature sensor 8 and the pressure sensor 9 detect the current temperature and pressure data in the constant volume charging and discharging gas tank 11.

[0059] The first flow regulating valve 10 and the third flow regulating valve 18 are controlled to be closed, and the first electric valve 2 is opened. At this time, only the first electric valve 2 is in the open state. The temperature sensor 8 and the pressure sensor 9 detect the current temperature and pressure data in the SF6 gas chamber.

[0060] The first flow regulating valve 10 is controlled to open slowly, and the gas in the constant volume charging and discharging gas tank 11 enters the SF6 gas chamber. The temperature sensor 8 and the pressure sensor 9 detect the temperature and pressure data in the current gas chamber in real time. When the pressure in the gas chamber is close to the set value, the first flow regulating valve 10 is controlled to decrease slowly. When the pressure in the gas chamber reaches the set value, the first flow regulating valve 10 and the first electric valve 2 are completely closed, and the inflation is completed.

[0061] After the inflation is completed, the first electric valve 2 is controlled to open, and the temperature sensor 8 and the pressure sensor 9 detect the temperature and pressure data in the current air chamber. After the detection data is stable, the first electric valve 2 is controlled to close; then the first flow regulating valve 10 is opened to the maximum, and the temperature sensor 8 and the pressure sensor 9 detect the temperature and pressure data in the current constant volume charging and discharging tank 11. At this point, the test of all inflation measurement data is completed.

[0062] 2. When the gas volume in the SF6 gas chamber is measured by deflation method:

[0063] First, manually open the first manual valve 1, and the first electric valve 2, the second electric valve 4, the third electric valve 6, and the fourth electric valve 14 in the device are all in the closed state; control the first flow regulating valve 10 to open to the maximum, and the temperature sensor 8 and the pressure sensor 9 detect the temperature and pressure data in the current constant volume charging and discharging tank 11.

[0064] After the detection data is stable, the first flow regulating valve 10 is controlled to close and the first electric valve 2 is opened. At this time, only the first electric valve 2 is in the open state, and the temperature sensor 8 and the pressure sensor 9 detect the current temperature and pressure data in the SF6 gas chamber.

[0065] After the detection data stabilizes, the first flow regulating valve 10 is controlled to open slowly, and the gas in the SF6 gas chamber enters the constant volume charging and discharging tank 11. The temperature sensor 8 and the pressure sensor 9 detect the real-time temperature and pressure data in the current SF6 gas chamber. When the pressure in the SF6 gas chamber is close to the set value, the first flow regulating valve 10 is controlled to decrease slowly. When the pressure in the gas chamber reaches the set value, the first flow regulating valve 10 and the first electric valve 2 are completely closed.

[0066] After the deflation is completed, the first electric valve 2 is controlled to open, and the temperature sensor 8 and the pressure sensor 9 detect the current temperature and pressure data in the SF6 gas chamber. After the detection data is stable, the first electric valve 2 is controlled to close, and the first flow regulating valve 10 is opened to the maximum. The temperature sensor 8 and the pressure sensor 9 detect the current temperature and pressure data in the constant volume charging and discharging tank 11.

[0067] The released gas is discharged outside the device as waste gas, and a waste gas cylinder is connected at C. The compressor 15 and the refrigeration unit 16 are turned on in sequence, and the first flow regulating valve 10 and the second flow regulating valve 12 are opened to the maximum state. The first electric valve 2, the second electric valve 4, and the third electric valve 6 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.

[0068] 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 SF6 gas chamber constant volume filling and discharging measuring device, characterized in that: The invention comprises a first manual valve (1), a first electric valve (2), a pressure gauge (3), a second electric valve (4), a vacuum pump, a temperature sensor (8), a pressure sensor (9), a first flow regulating valve (10), a constant volume gas charging and discharging tank (11), a second flow regulating valve (12), a buffer tank (13), a fourth electric valve (14), a compressor (15), a refrigeration unit (16), a second manual valve (17), and a third flow regulating valve (18); the first manual valve (1), the first electric valve (2), the pressure gauge (3), the temperature sensor (8), the pressure sensor (9), the first flow regulating valve (10), the constant volume gas charging and discharging tank (11), 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, and the first manual valve (1) The non-series end of the second electric valve (4) is connected to the SF6 gas chamber connector of the electrical equipment; the second electric valve (4) is sealedly connected in series with the vacuum pumping device, the output end of the vacuum pumping device is connected to the outside, and the non-series end of the second electric valve (4) is sealedly connected between the pressure gauge (3) and the temperature sensor (8); one end of the fourth electric valve (14) is sealedly connected between the buffer tank (13) and the compressor (15), and the other end of the fourth electric valve (14) is sealedly connected to the output end of the refrigeration unit (16), and the output end of the refrigeration unit (16) is connected to the waste gas cylinder; the second manual valve (17) is sealedly connected in series with the third flow regulating valve (18), the non-series end of the second manual valve (17) is connected to the SF6 cylinder, and the non-series end of the third flow regulating valve (18) is connected between the pressure gauge (3) and the temperature sensor (8).

2. A SF6 gas chamber constant volume filling and discharging measuring device according to claim 1, characterized in that: The vacuum pumping device comprises a vacuum pump (5), a third electric valve (6), and a vacuum gauge (7); the second electric valve (4) is sealedly connected in series with the vacuum pump (5), and the non-series end of the second electric valve (4) is sealedly connected between the pressure gauge (3) and the temperature sensor (8); the third electric valve (6) is sealedly connected in series with the vacuum gauge (7), and the non-series end of the third electric valve (6) is sealedly connected between the second electric valve (4) and the vacuum pump (5).

3. A SF6 gas chamber constant volume filling and discharging measuring device according to claim 2, characterized in that: Before using the device, the device body must first be evacuated, an exhaust pipe must be connected to the output end of the vacuum pump (5), the output end of the refrigeration unit (16) must be connected to the waste gas cylinder, the first manual valve (1), the second manual valve (17) and the valve at the waste gas cylinder must be closed, and then the first electric valve (2), the second electric valve (4), the third electric valve (6), the fourth electric valve (14) and the vacuum gauge (7) and the vacuum pump (5) must be opened in sequence, all the pipes in the device must be connected, and the vacuum pump (5) must start evacuating the device body until the evacuation is completed.

4. A SF6 gas chamber constant volume filling and discharging measuring device according to claim 3, characterized in that: The method for measuring the gas volume in the SF6 gas chamber is as follows: The second flow regulating valve (12) is closed, the second manual valve (17) is opened, the first electric valve (2) and the second electric valve (4) are closed, the first flow regulating valve (10) and the third flow regulating valve (18) are opened to the maximum, an external SF6 steel cylinder is used to inflate the constant volume charging and discharging tank (11) to a set pressure value, and the temperature sensor (8) and the pressure sensor (9) detect the current temperature and pressure data in the constant volume charging and discharging tank (11); Controlling the first flow regulating valve (10) and the third flow regulating valve (18) to close and the first electric valve (2) to open, where only the first electric valve (2) is in an open state, and the temperature sensor (8) and the pressure sensor (9) to detect current temperature and pressure data in the SF6 gas chamber; The first flow regulating valve (10) is controlled to open slowly, and the gas in the constant volume gas charging and discharging tank (11) enters the SF6 gas chamber. The temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current gas chamber in real time. When the pressure in the gas chamber approaches the set value, the first flow regulating valve (10) is controlled to decrease slowly. When the pressure in the gas chamber reaches the set value, the first flow regulating valve (10) and the first electric valve (2) are completely closed, and the charging is completed. After the inflation is completed, the first electric valve (2) is controlled to open, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current air chamber. After the detection data is stable, the first electric valve (2) is controlled to close; then the first flow regulating valve (10) is opened to the maximum, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current constant volume inflation and deflation tank (11). At this point, the test of all the data of the inflation measurement is completed.

5. The SF6 gas chamber constant volume filling and discharging measuring device according to claim 3 is characterized in that: The method for venting measurement of the gas volume in the SF6 gas chamber is: First, manually open the first manual valve (1), and the first electric valve (2), the second electric valve (4), the third electric valve (6), and the fourth electric valve (14) in the device are all in a closed state; control the first flow regulating valve (10) to open to the maximum, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current constant volume charging and discharging tank (11); The first flow regulating valve (10) is controlled to be closed and the first electric valve (2) is controlled to be opened. At this time, the first manual valve (1) and the first electric valve (2) are in an open state, and the temperature sensor (8) and the pressure sensor (9) detect the current temperature and pressure data in the SF6 gas chamber; The first flow regulating valve (10) is controlled to open slowly, and the gas in the SF6 gas chamber enters the constant volume charging and discharging gas tank (11). The temperature sensor (8) and the pressure sensor (9) detect the real-time temperature and pressure data in the current SF6 gas chamber. When the pressure in the SF6 gas chamber approaches the set value, the first flow regulating valve (10) is controlled to decrease slowly. When the pressure in the gas chamber reaches the set value, the first flow regulating valve (10) and the first electric valve (2) are completely closed. After the deflation is completed, the first electric valve (2) is controlled to open, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current SF6 gas chamber. After the detection data is stable, the first electric valve (2) is controlled to close, the first flow regulating valve (10) is opened to the maximum, and the temperature sensor (8) and the pressure sensor (9) detect the temperature and pressure data in the current constant volume charging and discharging tank (11); The released gas is discharged out of the device as waste gas, and a waste gas cylinder is connected to the output end of the refrigeration unit (16). The compressor (15) and the refrigeration unit (16) are turned on in sequence, and the first flow regulating valve (10) and the second flow regulating valve (12) are opened to the maximum state. The first electric valve (2), the second electric valve (4), and the third electric valve (6) 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).

6. A SF6 gas chamber constant volume filling and discharging measuring device according to claim 1, characterized in that: The first manual valve (1) and the second manual valve (17) are both Q41F-16P stainless steel flange ball valves.

7. The SF6 gas chamber constant volume filling and discharging measuring device according to claim 1 is characterized in that: The model of the pressure gauge (3) is Y-60BFZ.

8. The SF6 gas chamber constant volume filling and discharging measuring device according to claim 1 is characterized in that: The temperature sensor (8) is a TJ36-CASS-116U-6 temperature sensor from OMEGA; the pressure sensor (9) is a PX409 series pressure sensor from OMEGA.

9. The SF6 gas chamber constant volume filling and discharging measuring device according to claim 1 is characterized in that: The model of the first flow regulating valve (10), the second flow regulating valve (12) and the third flow regulating valve (18) is AOX-L.

10. A SF6 gas chamber constant volume filling and discharging measuring device according to claim 2, characterized in that: The first electric valve (2), the second electric valve (4), the third electric valve (6), and the fourth electric valve (14) are all Q911F-16S electric UPVC ball valves; the vacuum pump (5) is of model 2RH090C; and the vacuum gauge (7) is a German PPT20 vacuum gauge.

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