A sulfur hexafluoride gas sampling device and sampling test method

Abstract

The present invention discloses a sulfur hexafluoride gas sampling device and a sampling test method. The device is provided with a multi-way valve and a transfer valve, which cooperate with a recovery bottle and a sampling bottle to collect residual gas in the sampling bottle and a pipeline connected to the equipment into the recovery bottle, and then the gas in the recovery bottle is discharged in an orderly manner. When the equipment is connected, the recovery bottle can purify the pipeline connected to the equipment and then sample through the sampling bottle. Therefore, the disordered emission of sulfur hexafluoride gas can be controlled, which is more environmentally friendly. The recovery bottle purifies the pipeline before sampling, and the sampled gas has higher consistency with the gas in the equipment, and the detection result is more reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of gas detection, and in particular relates to a sulfur hexafluoride gas sampling device and a sampling testing method. Background Art

[0002] Sulfur hexafluoride (SF6) is colorless, odorless, and non-toxic, with excellent insulation and arc-extinguishing properties, making it widely used in electrical equipment. However, SF6 is also a greenhouse gas, with a global warming potential (GWP) 23,900 times that of CO2 and a natural lifespan of 3,200 years. It is one of the six greenhouse gases banned under the Kyoto Protocol, making the recovery and treatment of SF6 extremely important.

[0003] Existing online testing solutions for electrical insulation equipment struggle to accurately detect SF6 gas decomposition products within electrical equipment, making it difficult to accurately assess the operating status of SF6 electrical equipment. To more accurately detect SF6 gas decomposition products within operating electrical equipment, as a basis for determining the operating status of SF6 electrical equipment, samples must be collected from the field and sent to a laboratory for testing.

[0004] While existing sampling devices can perform sampling tasks, issues with internal materials and sampling design can distort samples and prevent reliable judgment of equipment operation. One reason for this is that current SF6 gas sampling containers cannot be vacuumed before sampling and lack a purge process, making it impossible to guarantee the true state of the sample.

[0005] In addition, the disorderly emission of residual gas after sampling has aggravated greenhouse gas emissions. Measures should be taken to improve the recovery rate and utilization rate of sulfur hexafluoride gas in the sampling gas.

[0006] Based on this, it is necessary to develop and design a sulfur hexafluoride gas sampling device. Summary of the Invention

[0007] The object of the present invention is to provide a sulfur hexafluoride gas sampling device and a sampling test method to improve the recovery rate and utilization rate of sulfur hexafluoride gas in the sampled gas.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a sulfur hexafluoride gas sampling device, comprising:

[0010] Multi-way valves, transfer valves, recovery bottles and sampling bottles;

[0011] The multi-way valve is a five-way valve, and the transfer valve is a two-position three-way valve. The first port of the transfer valve is connected to the second port of the multi-way valve, and the second port of the transfer valve is connected to the third port of the multi-way valve. The first port of the multi-way valve and the third port of the transfer valve are used to connect to external equipment;

[0012] The recovery bottle and the sampling bottle are respectively connected to the fourth port and the fifth port of the multi-way valve;

[0013] The multi-way valve has multiple gears, including: a transfer gear, a recovery gear, a gas washing gear and a sampling gear, wherein the transfer gear connects the second port of the multi-way valve with the fourth port and the third port with the fifth port; the recovery gear connects the third port with the fifth port of the multi-way valve; the gas washing gear connects the first port of the multi-way valve with the fifth port, and the sampling gear connects the first port of the multi-way valve with the fourth port.

[0014] In some embodiments, the inner surface of the sampling bottle is coated with a polytetrafluoroethylene coating.

[0015] In some embodiments, the sulfur hexafluoride gas sampling device further includes: a hydrogen fluoride testing module, the hydrogen fluoride testing module including: a throttle valve, a colorimetric tube holder, and a pressure reducing valve;

[0016] The second port of the throttle valve is communicated with the first end of the colorimetric tube holder, the second end of the colorimetric tube holder is communicated with the first port of the pressure reducing valve, the second port of the pressure reducing valve is communicated with the first port of the multi-way valve, and the first port of the throttle valve is used to connect to an external device;

[0017] The multi-way valve further has a test position, which connects the first port and the fifth port of the multi-way valve.

[0018] In some embodiments, the sulfur hexafluoride gas sampling device further includes a detachable group and an indicator group, the detachable group including: a one-way valve and a vacuum pump, the one-way valve inlet is connected to the second port of the multi-way valve, the one-way valve outlet is connected to the vacuum pump inlet, and the vacuum pump outlet is connected to the first port of the transfer valve;

[0019] The indicator group includes: a first pressure gauge, a second pressure gauge and a third pressure gauge. The pressure measuring port of the first pressure gauge is connected to the first port of the throttle valve, the pressure measuring port of the second pressure gauge is connected to the first port of the pressure reducing valve, and the pressure measuring port of the third pressure gauge is connected to the third port of the multi-way valve.

[0020] In some embodiments, the recovery bottle sleeve is arranged outside the sampling bottle, and a heating device and a heat preservation device are sequentially provided between the sampling bottle and the peripheral wall of the recovery bottle.

[0021] In a second aspect, the present invention provides a sulfur hexafluoride gas sampling and testing method, which is applied to the sulfur hexafluoride gas sampling device as described in the first aspect, comprising:

[0022] Transfer the gas in the sampling bottle to the recovery bottle through a vacuum pump;

[0023] Transferring the gas in the recovery bottle to an external recovery device through the vacuum pump;

[0024] Connecting a first port of the multi-way valve to a target device through a pipeline, wherein the target device stores sulfur hexafluoride gas to be sampled;

[0025] Purifying the gas in the pipeline through the recovery bottle;

[0026] The sampling bottle takes out a sulfur hexafluoride gas sample from the target device.

[0027] In some embodiments, transferring the gas in the sampling bottle to the recovery bottle via a vacuum pump comprises:

[0028] Connect the first port and the second port of the transfer valve;

[0029] Switching the multi-way valve to the transfer gear;

[0030] Starting the vacuum pump to transfer the gas in the sampling bottle to the recovery bottle, and stopping the vacuum pump when the vacuum degree in the sampling bottle reaches a threshold value;

[0031] The step of transferring the gas in the recovery bottle to an external recovery device by the vacuum pump comprises:

[0032] connecting the first port and the third port of the transfer valve;

[0033] Switching the multi-way valve to the recovery gear;

[0034] The vacuum pump is started to transfer the gas in the recovery bottle to the external recovery device, and when the vacuum degree in the sampling bottle reaches a threshold value, the vacuum pump is stopped.

[0035] In some embodiments, purifying the gas in the pipeline through the recovery bottle includes:

[0036] Switch the multi-way valve to the gas washing position and evacuate the pipeline until the vacuum degree of the recovery bottle no longer changes;

[0037] The sampling bottle takes out the sulfur hexafluoride gas sample from the target device, comprising: switching the multi-way valve to the sampling gear until the gas pressure of the recovery bottle is the same as the gas pressure of the target device.

[0038] In some embodiments, before connecting the first port of the multi-way valve to the target device through a pipeline, the method includes:

[0039] Install the hydrogen fluoride colorimetric tube through the colorimetric tube holder;

[0040] After the first port of the multi-way valve is connected to the target device through a pipeline, the method includes:

[0041] Adjust the pressure reducing valve and the throttle valve according to the air pressure of the target device;

[0042] The multi-way valve is switched to the test position to perform a hydrogen fluoride test on the gas in the target device.

[0043] In a third aspect, the present invention provides a method for coating a sampling bottle with polytetrafluoroethylene, which is applied to the sulfur hexafluoride gas sampling device as described in the first aspect, comprising:

[0044] The polytetrafluoroethylene coating is obtained by spraying through the following steps:

[0045] Pickling the sampling bottle blank;

[0046] The inner surface of the sampling bottle is sandblasted or shot blasted, wherein the sandblasting pressure is 0.6 MPa and the duration is 45-55 seconds when the sandblasting process is adopted;

[0047] The sampling bottle is boiled at least three times, wherein each boiling is performed in a different boiling tank, the boiling water temperature is controlled to be above 90° C., the boiling water is pure water obtained by reverse osmosis or distillation, and the total boiling time is not less than 30 minutes;

[0048] The mouth of the sampling bottle is flushed down and hung, and then dried with water vapor;

[0049] Maintaining the suspended posture, the inner surface of the sampling bottle is sprayed with polytetrafluoroethylene coating using a spray gun, wherein the nozzle of the spray gun is a long rod-shaped nozzle, and the nozzle adopts a bottom-up and rotational spraying method, and the rotation axis of the nozzle coincides with the axis of the sampling bottle;

[0050] Keep the hanging posture and send it into the drying furnace for drying. The temperature of the drying furnace is 240℃-290℃ and the drying time in the drying furnace is not less than 30 minutes;

[0051] Keep hanging and let it stand at room temperature for at least 24 hours.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] The present invention is provided with a multi-way valve and a transfer valve, which cooperate with a recovery bottle and a sampling bottle to collect the residual gas in the sampling bottle and the pipeline of the connecting equipment into the recovery bottle, and then discharge the gas in the recovery bottle in an orderly manner. When connecting the equipment, the recovery bottle can purify the pipeline of the connecting equipment and then sample through the sampling bottle. Therefore, the disorderly emission of sulfur hexafluoride gas can be controlled, which is more environmentally friendly. The recovery bottle purifies the pipeline before sampling, and the sampled gas has higher consistency with the gas in the equipment, and the detection result is more reliable.

[0054] The invention is equipped with a hydrogen fluoride test module, which stabilizes the pressure difference at both ends of the colorimetric tube and controls the cross-sectional area of ​​the effective cross-section of the colorimetric tube, so that the flow rate of the airflow through the colorimetric tube is stable, and the final tested gas is recovered by the recovery bottle, thereby achieving the purpose of accurate gas measurement and efficient utilization.

[0055] The present invention first transfers the gas in the sampling bottle to a recovery bottle through a vacuum pump, then transfers the gas in the recovery bottle to an external recovery device through the vacuum pump, then connects the first port of the multi-way valve to the target device through a pipeline, wherein the target device stores sulfur hexafluoride gas to be sampled, then purifies the gas in the pipeline through the recovery bottle, and finally, the sampling bottle takes out the sulfur hexafluoride gas sample from the target device. This method recovers, purifies the pipeline, samples and tests the residual gas in an orderly manner. Therefore, this method has a high gas utilization rate, less disordered emissions, and little interference of residual gas on the sample gas, thereby ensuring the accuracy of the sampled sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0057] Figure 1 This is a schematic diagram of a sulfur hexafluoride gas sampling device provided in an embodiment of the present invention;

[0058] Figure 2 is a perspective view of a recovery bottle sleeve and a sampling bottle provided in an embodiment of the present invention;

[0059] Figure 3 This is a flow chart of a sulfur hexafluoride gas sampling and testing method provided by an embodiment of the present invention;

[0060] Among them: 1-multi-way valve; 2-transfer valve; 3-recovery bottle; 5-throttle valve; 6-colorimetric tube holder; 7-pressure reducing valve; 8-check valve; 9-vacuum pump; 10-first pressure gauge; 11-second pressure gauge; 12-third pressure gauge; 13-hydrogen fluoride colorimetric tube; 14-heating device; 15-insulation device; 16-GIS equipment; 18-sampling bottle. DETAILED DESCRIPTION

[0061] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0062] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0063] Figure 1 Schematic diagram of the sulfur hexafluoride gas sampling device provided in an embodiment of the present invention.

[0064] like Figure 1 As shown, it shows a schematic diagram of a sulfur hexafluoride gas sampling device provided by an embodiment of the present invention, which is described in detail as follows:

[0065] A sulfur hexafluoride gas sampling device, comprising:

[0066] Multi-way valve 1, transfer valve 2, recovery bottle 3 and sampling bottle 18;

[0067] The multi-way valve 1 is a five-way valve, and the transfer valve 2 is a two-position three-way valve. The first port of the transfer valve 2 is connected to the second port of the multi-way valve 1, and the second port of the transfer valve 2 is connected to the third port of the multi-way valve 1. The first port of the multi-way valve 1 and the third port of the transfer valve 2 are used to connect to external equipment;

[0068] The recovery bottle 3 and the sampling bottle 18 are connected to the fourth port and the fifth port of the multi-way valve 1 respectively;

[0069] The multi-way valve 1 has multiple gears, including: a transfer gear, a recovery gear, a gas washing gear and a sampling gear, wherein the transfer gear connects the second port of the multi-way valve 1 with the fourth port and the third port with the fifth port; the recovery gear connects the third port with the fifth port of the multi-way valve 1; the gas washing gear connects the first port of the multi-way valve 1 with the fifth port, and the sampling gear connects the first port of the multi-way valve 1 with the fourth port.

[0070] In some embodiments, the sulfur hexafluoride gas sampling device further includes: a hydrogen fluoride testing module, the hydrogen fluoride testing module including: a throttle valve 5, a colorimetric tube holder 6 and a pressure reducing valve 7;

[0071] The second port of the throttle valve 5 is communicated with the first end of the colorimetric tube holder 6, the second end of the colorimetric tube holder 6 is communicated with the first port of the pressure reducing valve 7, the second port of the pressure reducing valve 7 is communicated with the first port of the multi-way valve 1, and the first port of the throttle valve 5 is used to connect to an external device;

[0072] The multi-way valve 1 further has a test gear, which connects the first port and the fifth port of the multi-way valve 1.

[0073] For example, as mentioned above, the sulfur hexafluoride sampling device in the prior art has the problem that the sampling gas is impure, mixed with residual gas, and the sampled gas is discharged disorderly, which increases greenhouse gases.

[0074] In some embodiments, the inner surface of the sampling bottle 18 is coated with a polytetrafluoroethylene coating.

[0075] In the embodiment of the present invention, the multi-way valve 1, the transfer valve 2 cooperate with the recovery bottle 3 and the sampling bottle 18 to collect and purify the residual gas in the pipeline connected to the equipment, thereby ensuring the purity of the sampled gas.

[0076] exist Figure 1 In the figure, the recovery bottle 3 and the sampling bottle 18 are respectively connected to two ports of the multi-way valve 1. The multi-way valve 1 has a total of five ports, and the remaining three ports are respectively used to connect to the target sampling device, the vacuum pump 9 and the transfer valve 2.

[0077] The transfer valve 2 is a two-position three-way valve, and its two positions respectively enable the first port of the transfer valve 2 to be connected to the second port, and the first port to be connected to the third port.

[0078] The multi-way valve 1 is provided with multiple gears, which are used to transfer the gas in the sampling bottle 18 to the recovery bottle 3, transfer the gas in the recovery bottle 3 to the outside, purify the connecting pipeline through the recovery bottle 3, and sample from the external device through the sampling bottle 18.

[0079] In some application scenarios, for example, Figure 1 In the illustrated scenario, the target device to be sampled is the GIS device 16. As we all know, the sulfur hexafluoride gas in the GIS device 16 is partially decomposed into hydrogen fluoride due to the discharge and other phenomena that occur in the internal combined electrical system. Therefore, in some embodiments, the sampling device is also provided with a hydrogen fluoride testing module.

[0080] Specifically, the hydrogen fluoride test module is tested by a hydrogen fluoride colorimetric tube 13. The colorimetric tube has high requirements for the flow rate required for the test. Therefore, the module is provided with a pressure reducing valve 7 and a throttle valve 5. The pressure reducing valve 7 is used to make the pressure difference at both ends of the colorimetric tube on the colorimetric tube holder 6 constant, and the throttle valve 5 can change the effective cross-sectional area of ​​gas circulation by adjustment. Because the pressure reducing valve 7 for stabilizing the pressure difference and the throttle valve 5 for controlling the flow are respectively provided at both ends of the colorimetric tube holder 6, the air flow rate is always stable within a reasonable range.

[0081] Correspondingly, a test gear is provided on the multi-way valve 1, the purpose of which is to establish an airflow from the GIS equipment 16 to the colorimetric tube, and then from the colorimetric tube to the recovery bottle 3. That is to say, the gas after the test is finally collected in the recovery bottle 3, which serves the purpose of preventing disorderly emission of greenhouse gases.

[0082] The embodiment of the present invention is provided with a multi-way valve 1 and a transfer valve 2, which cooperate with a recovery bottle 3 and a sampling bottle 18 to collect the residual gas in the sampling bottle 18 and the pipeline of the connecting device into the recovery bottle 3, and then the gas in the recovery bottle 3 is discharged in an orderly manner. When connecting the device, the recovery bottle 3 can purify the pipeline of the connecting device and then sample through the sampling bottle 18. Therefore, the disordered emission of sulfur hexafluoride gas can be controlled, which is more environmentally friendly. The recovery bottle 3 purifies the pipeline before sampling, and the sampled gas has a higher consistency with the gas in the device, and the detection result is more reliable.

[0083] In some embodiments, the sulfur hexafluoride gas sampling device further includes a detachable group and an indicator group, the detachable group including: a one-way valve 8 and a vacuum pump 9, the air inlet of the one-way valve 8 is connected to the second port of the multi-way valve 1, the air outlet of the one-way valve 8 is connected to the air inlet of the vacuum pump 9, and the air outlet of the vacuum pump 9 is connected to the first port of the transfer valve 2;

[0084] The indicator group includes: a first pressure gauge 10, a second pressure gauge 11 and a third pressure gauge 12. The pressure measuring port of the first pressure gauge 10 is connected to the first port of the throttle valve 5, the pressure measuring port of the second pressure gauge 11 is connected to the first port of the pressure reducing valve 7, and the pressure measuring port of the third pressure gauge 12 is connected to the third port of the multi-way valve 1.

[0085] In some embodiments, the recovery bottle 3 is sleeved on the outside of the sampling bottle 18 , and a heating device 14 and a heat preservation device 15 are sequentially provided between the sampling bottle 18 and the peripheral wall of the recovery bottle 3 .

[0086] For example, in some application scenarios, the sampling device is equipped with a detachable vacuum pump 9. The inlet of vacuum pump 9 is equipped with a one-way valve 8. When vacuum pump 9 stops working, one-way valve 8 can quickly close the port to prevent pressure release. There are three pressure gauges in total, one for detecting the outlet pressure of the target device, the pressure after pressure reduction by pressure reducing valve 7, and the pressure at the third port of multi-way valve 1.

[0087] like Figure 2 As shown, in some application scenarios, the sampling bottle 18 is set inside the recovery bottle 3, and the outside of the sampling bottle 18 is respectively wrapped with a heating device 14 and a heat preservation device 15. When the gas in the sampling bottle 18 is discharged, the gas in the sampling bottle 18 can be preheated to a preset temperature and then connected to the gas analyzer to ensure the accuracy of the gas analyzer detection. The heating device 14 can be electrically heated, for example, a heating wire, and the heat preservation device 15 can be of various types, such as heat preservation cotton. Those skilled in the art should understand that this is only an example provided for ease of understanding and is not limiting.

[0088] like Figure 3 As shown, it shows a schematic diagram of the sulfur hexafluoride gas sampling and testing method provided by an embodiment of the present invention, which is described in detail as follows:

[0089] The method is applied to the aforementioned sulfur hexafluoride gas sampling device, comprising:

[0090] Step 301 : The gas in the sampling bottle 18 is transferred to the recovery bottle 3 via the vacuum pump 9 .

[0091] In some embodiments, step 301 includes:

[0092] Connect the first port and the second port of the transfer valve 2.

[0093] The multi-way valve 1 is switched to the transfer gear.

[0094] The vacuum pump 9 is started to transfer the gas in the sampling bottle 18 to the recovery bottle 3 , and when the vacuum degree in the sampling bottle 18 reaches a threshold value, the vacuum pump 9 is stopped.

[0095] Step 302: Transfer the gas in the recovery bottle 3 to an external recovery device through the vacuum pump 9.

[0096] In some embodiments, step 302 includes:

[0097] The first port and the third port of the transfer valve 2 are connected.

[0098] Switch the multi-way valve 1 to the recovery gear.

[0099] The vacuum pump 9 is started to transfer the gas in the recovery bottle 3 to the external recovery device. When the vacuum degree in the sampling bottle 18 reaches a threshold value, the vacuum pump 9 is stopped.

[0100] Step 303: Connect the first port of the multi-way valve 1 to a target device through a pipeline, wherein the target device stores sulfur hexafluoride gas to be sampled.

[0101] Step 304: Purify the gas in the pipeline through the recovery bottle 3.

[0102] In some implementations, step 304 includes:

[0103] The multi-way valve 1 is switched to the gas washing gear, and the pipeline is evacuated until the vacuum degree of the recovery bottle 3 no longer changes.

[0104] Step 305: The sampling bottle 18 takes out the sulfur hexafluoride gas sample from the target device.

[0105] In some embodiments, step 305 includes:

[0106] The sampling bottle 18 takes out the sulfur hexafluoride gas sample from the target device, including: switching the multi-way valve 1 to the sampling gear until the gas pressure of the recovery bottle 3 is the same as the gas pressure of the target device.

[0107] In some embodiments, steps 306 and 307 are further included. Step 306 is provided before step 303 and includes:

[0108] The hydrogen fluoride colorimetric tube 13 is installed through the colorimetric tube holder 6 .

[0109] Step 307 is provided after step 303 and includes:

[0110] Adjust the pressure reducing valve 7 and the throttle valve 5 according to the air pressure of the target device;

[0111] The multi-way valve 1 is switched to the test position to perform a hydrogen fluoride test on the gas in the target device.

[0112] It should be noted that in some application scenarios, heating may also be enabled. For example, before executing step 301, enabling the heating device 14 can completely gasify the sulfur hexafluoride gas and transfer it more completely.

[0113] In a third aspect, the present invention provides a method for coating a sampling bottle with polytetrafluoroethylene, which is applied to the sampling bottle coating process as described in the first aspect, comprising:

[0114] The polytetrafluoroethylene coating is obtained by spraying through the following steps:

[0115] Pickling the blank of the sampling bottle 18;

[0116] The inner surface of the sampling bottle 18 is sandblasted or shot blasted, wherein the sandblasting pressure is 0.6 MPa and the duration is 45-55 seconds when the sandblasting process is adopted;

[0117] The sampling bottle 18 is boiled at least three times, wherein each boiling is performed in a different boiling tank, the boiling water temperature is controlled to be above 90° C., the boiling water is pure water obtained by reverse osmosis or distillation, and the total boiling time is not less than 30 minutes;

[0118] The sampling bottle 18 is hung with the bottle mouth flushed down and then dried with water vapor;

[0119] Maintaining the suspended posture, the inner surface of the sampling bottle 18 is sprayed with polytetrafluoroethylene coating using a spray gun, wherein the nozzle of the spray gun is a long rod-shaped nozzle, and the nozzle adopts a bottom-up and rotational spraying method, and the rotation axis of the nozzle coincides with the axis of the sampling bottle 18;

[0120] Keep the hanging posture and send it into the drying furnace for drying. The temperature of the drying furnace is 240℃-290℃ and the drying time in the drying furnace is not less than 30 minutes;

[0121] Keep hanging and let it stand at room temperature for at least 24 hours.

[0122] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0123] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A sulfur hexafluoride gas sampling device, characterized in that: include: A multi-way valve (1), a transfer valve (2), a recovery bottle (3), and a sampling bottle (18); The multi-way valve (1) is a five-way valve, and the transfer valve (2) is a two-position three-way valve. The first port of the transfer valve (2) is connected to the second port of the multi-way valve (1), and the second port of the transfer valve (2) is connected to the third port of the multi-way valve (1). The first port of the multi-way valve (1) and the third port of the transfer valve (2) are used to connect to external equipment. The recovery bottle (3) and the sampling bottle (18) are respectively connected to the fourth port and the fifth port of the multi-way valve (1); The multi-way valve (1) has a plurality of gears, including a transfer gear, a recovery gear, a gas washing gear, and a sampling gear, wherein the transfer gear connects the second port of the multi-way valve (1) with the fourth port and connects the third port with the fifth port; the recovery gear connects the third port of the multi-way valve (1) with the fifth port; the gas washing gear connects the first port of the multi-way valve (1) with the fifth port, and the sampling gear connects the first port of the multi-way valve (1) with the fourth port.

2. The sulfur hexafluoride gas sampling device according to claim 1, characterized in that: The inner surface of the sampling bottle (18) is coated with a polytetrafluoroethylene coating.

3. The sulfur hexafluoride gas sampling device according to claim 1, characterized in that: The sulfur hexafluoride gas sampling device further comprises: a hydrogen fluoride testing module, wherein the hydrogen fluoride testing module comprises: a throttle valve (5), a colorimetric tube seat (6) and a pressure reducing valve (7); The second port of the throttle valve (5) is communicated with the first end of the colorimetric tube holder (6), the second end of the colorimetric tube holder (6) is communicated with the first port of the pressure reducing valve (7), the second port of the pressure reducing valve (7) is communicated with the first port of the multi-way valve (1), and the first port of the throttle valve (5) is used to connect to an external device; The multi-way valve (1) further has a test gear, and the test gear connects the first port and the fifth port of the multi-way valve (1).

4. The sulfur hexafluoride gas sampling device according to claim 3, characterized in that: The sulfur hexafluoride gas sampling device further comprises a detachable group and an indicator group, wherein the detachable group comprises: a one-way valve (8) and a vacuum pump (9), wherein the air inlet of the one-way valve (8) is communicated with the second port of the multi-way valve (1), the air outlet of the one-way valve (8) is communicated with the air inlet of the vacuum pump (9), and the air outlet of the vacuum pump (9) is communicated with the first port of the transfer valve (2); The indicator group includes: a first pressure gauge (10), a second pressure gauge (11) and a third pressure gauge (12), wherein the pressure measuring port of the first pressure gauge (10) is connected to the first port of the throttle valve (5), the pressure measuring port of the second pressure gauge (11) is connected to the first port of the pressure reducing valve (7), and the pressure measuring port of the third pressure gauge (12) is connected to the third port of the multi-way valve (1).

5. The sulfur hexafluoride gas sampling device according to claim 1, characterized in that: The recovery bottle (3) is sleeved on the outside of the sampling bottle (18), and a heating device (14) and a heat preservation device (15) are sequentially provided between the peripheral walls of the sampling bottle (18) and the recovery bottle (3).

6. A sulfur hexafluoride gas sampling and testing method, implemented based on the sulfur hexafluoride gas sampling device according to any one of claims 1 to 5, characterized in that: include: Transferring the gas in the sampling bottle (18) to the recovery bottle (3) via the vacuum pump (9); Transferring the gas in the recovery bottle (3) to an external recovery device via the vacuum pump (9); Connecting the first port of the multi-way valve (1) to a target device through a pipeline, wherein the target device stores sulfur hexafluoride gas to be sampled; Purifying the gas in the pipeline through the recovery bottle (3); The sampling bottle (18) takes out a sulfur hexafluoride gas sample from the target device.

7. The sulfur hexafluoride gas sampling and testing method according to claim 6, characterized in that: The method of transferring the gas in the sampling bottle (18) to the recovery bottle (3) via the vacuum pump (9) comprises: Connecting the first port and the second port of the transfer valve (2); Switching the multi-way valve (1) to the transfer gear; Starting the vacuum pump (9) to transfer the gas in the sampling bottle (18) to the recovery bottle (3), and stopping the vacuum pump (9) when the vacuum degree in the sampling bottle (18) reaches a threshold value; The method of transferring the gas in the recovery bottle (3) to an external recovery device by means of the vacuum pump (9) comprises: Connecting the first port and the third port of the transfer valve (2); Switching the multi-way valve (1) to the recovery gear; The vacuum pump (9) is started to transfer the gas in the recovery bottle (3) to the external recovery device, and when the vacuum degree in the sampling bottle (18) reaches a threshold value, the vacuum pump (9) is stopped.

8. The sulfur hexafluoride gas sampling and testing method according to claim 6, characterized in that: The gas in the pipeline is purified by the recovery bottle (3), including: Switch the multi-way valve (1) to the gas washing position, and evacuate the pipeline until the vacuum degree of the recovery bottle (3) no longer changes; The sampling bottle (18) takes out a sulfur hexafluoride gas sample from the target device, comprising: switching the multi-way valve (1) to the sampling gear until the gas pressure of the recovery bottle (3) is the same as the gas pressure of the target device.

9. The sulfur hexafluoride gas sampling and testing method according to claim 6, characterized in that: Before the first port of the multi-way valve (1) is connected to the target device through a pipeline, the method includes: Installing a hydrogen fluoride colorimetric tube (13) through a colorimetric tube holder (6); After the first port of the multi-way valve (1) is connected to the target device through a pipeline, the method includes: adjusting the pressure reducing valve (7) and the throttle valve (5) according to the air pressure of the target device; The multi-way valve (1) is switched to the test position to perform a hydrogen fluoride test on the gas in the target device.

10. A method for coating a sampling bottle with polytetrafluoroethylene, applied to the sulfur hexafluoride gas sampling device according to any one of claims 1 to 5, characterized in that: include: The polytetrafluoroethylene coating is obtained by spraying through the following steps: Pickling the blank of the sampling bottle (18); The inner surface of the sampling bottle (18) is sandblasted or shot-blasted, wherein the sandblasting pressure is 0.6 MPa and the duration is 45-55 seconds when the sandblasting process is adopted; The sampling bottle (18) is boiled in water at least three times, wherein each boiling is performed in a different boiling tank, the water temperature of the boiling is controlled to be above 90° C., the boiling water is pure water obtained by reverse osmosis or distillation, and the total boiling time is not less than 30 minutes; The sampling bottle (18) is hung with the mouth facing downward and then dried with water vapor; Maintaining the suspended posture, the inner surface of the sampling bottle (18) is sprayed with polytetrafluoroethylene coating using a spray gun, wherein the nozzle of the spray gun is a long rod-shaped nozzle, and the nozzle adopts a bottom-up and rotational spraying method, and the rotation axis of the nozzle coincides with the axis of the sampling bottle (18); Keep the hanging posture and send it into the drying furnace for drying. The temperature of the drying furnace is 240℃-290℃ and the drying time in the drying furnace is not less than 30 minutes; Keep hanging and let it stand at room temperature for at least 24 hours.

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