A fully automatic degassing device and method for insulating oil chromatographic analysis

Abstract

The application discloses a full-automatic degassing device and method for insulating oil chromatographic analysis. The device comprises a total controller connected with a workstation terminal through a communication interface, and is characterized in that the device further comprises an oil inlet pipe 1, an oil outlet pipe 2, a quantitative oil bucket 3, a degassing chamber 4, a vacuum pump 9, an oil-gas separator 10 and a control valve assembly which are connected through a pipeline assembly. The total controller is electrically connected with the control valve assembly and the vacuum pump 9 respectively, and controls switching of on-off states of the control valve assembly and switching on and off of the vacuum pump 9.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas chromatographic analysis, and particularly discloses a full-automatic degassing device and method for insulating oil chromatographic analysis. BACKGROUND

[0002] The principle of insulating oil sample detection is based on that, under the running state of a transformer, due to the gradual aging and deterioration of the oil sample and the insulating solid, a small amount of gas is decomposed, mainly including hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide and various gases. When overheat failure, discharge failure and the insulating solid of the transformer are damp, the content of these gases will rapidly increase. The related detection gas chromatograph is to monitor the content and growth rate of the fault characteristic gas dissolved in the oil of the high-voltage equipment such as the transformer in real time and on line, and then predict the possible fault information of the equipment, avoid equipment accidents, and improve the safety and reliability of the equipment operation.

[0003] Before the gas chromatograph analyzes the dissolved gas of the insulating oil sample, the insulating oil sample needs to be completely degassed for pretreatment, and then the degassed gas is injected into the chromatograph for component analysis and detection. The complete degassing of the gas in the insulating oil realizes the oil-gas separation treatment, which is a key and necessary step for chromatographic analysis. The oil-gas separation is completed by the degassing device, and the degassed gas is injected into the chromatograph to analyze the components and content of the sample gas. The stability and accuracy of the complete degassing and oil-gas separation technology will directly affect the stability of the chromatographic detection equipment operation and the accuracy of the material content test.

[0004] In the common oil-gas separation method, the vacuum degassing method has the highest degassing efficiency, but has the following technical problems: because the traditional vacuum degassing method is controlled by the vacuum degree of the device, the structure is complex, the stability and reliability are poor, the component change of the oil sample cannot be quickly and real-timely responded, and the working measures of the existing instrument are mostly manual sampling, and the steps such as gas washing and oil washing of the device are completed, the operation steps are complicated, the working efficiency is low, and the automation degree is not high. SUMMARY

[0005] The application aims to overcome the defects in the prior art, and provides a full-automatic degassing device and method for insulating oil chromatographic analysis, which realizes complete degassing and oil-gas separation pretreatment before insulating oil chromatographic detection, is simple and convenient to operate, realizes complete degassing automation, achieves labor liberation, and improves the working efficiency of the entire chromatographic detection.

[0006] The application is implemented as follows: a full-automatic degassing device for insulating oil chromatographic analysis, comprising a total controller connected with a workstation terminal through a communication interface, and further comprising an oil inlet pipe 1, an oil outlet pipe 2, a quantitative oil tank 3, a degassing chamber 4, a vacuum pump 9, an oil-gas separator 10 and a control valve assembly connected through a pipeline assembly; the total controller is electrically connected with the control valve assembly and the vacuum pump 9 respectively, and controls switching of on-off state of the control valve assembly and switching on and off of the vacuum pump 9;

[0007] The control valve assembly comprises a two-position two-way valve group 5, a two-position three-way valve group 6, a six-way switching valve 7, a fixed-point pressure stabilizing valve 8 and an EPC proportional valve 11; the two-position two-way valve group 5 comprises a first two-way valve 501, a second two-way valve 502, a third two-way valve 503, a fourth two-way valve 504, a fifth two-way valve 505, a sixth two-way valve 506, a seventh two-way valve 507 and an eighth two-way valve 508; the two-position three-way valve group 6 comprises a first three-way valve 601, a second three-way valve 602, a third three-way valve 603 and a fourth three-way valve 604;

[0008] An inlet channel of the quantitative oil tank 3 is connected with the oil inlet pipe 1 through the eighth two-way valve 508, a first outlet channel 301 of the quantitative oil tank 3 is connected with a first inlet 404 of the degassing chamber 4 through the second two-way valve 502, and a second outlet channel 302 of the quantitative oil tank 3 is connected with a sixth interface of the six-way switching valve 7 through the seventh two-way valve 507; a second inlet 405 of the degassing chamber 4 is connected with one end of the third two-way valve 503, the other end of the third two-way valve 503 is connected in communication with one end of the fixed-point pressure stabilizing valve 8, a first end of the second three-way valve 602 and one end of the EPC proportional valve 11 respectively; the other end of the fixed-point pressure stabilizing valve 8 is connected with a nitrogen inlet pipe 13; the other end of the EPC proportional valve 11 is connected with a third interface of the six-way switching valve 7;

[0009] A first outlet 401 of the degassing chamber 4 is connected with the oil outlet pipe 2 through the first two-way valve 501;

[0010] A second outlet 402 of the degassing chamber 4, the sixth two-way valve 506, a first end of the first three-way valve 601, a second end of the first three-way valve 601, a first end of the third three-way valve 603, a second end of the third three-way valve 603, a first end of the fourth three-way valve 604, a second end of the fourth three-way valve 604 and a fifth interface of the six-way switching valve 7 are connected in sequence; a third end of the third three-way valve 603 and a third end of the fourth three-way valve 604 are connected with a venting pipeline 15 respectively.

[0011] The third end of the first three-way valve 601, the vacuum pump 9, the oil-gas separator 10, and one end of the fifth two-way valve 505 are sequentially connected, the other end of the fifth two-way valve 505 is connected with the second end of the second three-way valve 602 and one end of the fourth two-way valve 504 respectively, and the other end of the fourth two-way valve 504 is connected with the third outlet 403 of the degassing chamber 4;

[0012] The first interface of the six-way switching valve 7 is connected with the fourth interface of the six-way switching valve 7 through the constant flow pipe 16; in the initial state, the first interface and the second interface of the six-way switching valve 7 are connected, the third interface and the fourth interface are connected, and the fifth interface and the sixth interface are connected.

[0013] The total controller controls the switching of the on-off state of the control valve assembly, forms four switchable working pipeline passages, and the four working pipeline passages are: a gas washing pipeline passage, an oil washing pipeline passage, a degassing pipeline passage, and an oil discharge pipeline passage.

[0014] The gas washing pipeline passage includes a first gas washing passage and a second gas washing passage, and the seventh two-way valve 507 and the six-way switching valve 7 are connected with the first pressure sensor 12.

[0015] The second inlet 405 of the degassing chamber 4 and the third two-way valve 503 are connected with the second pressure sensor 14.

[0016] When the vacuum pump 9 is closed, the gas path is directly connected to the vacuum pump 9; the oil-gas separator 10, the EPC proportional valve 11, and the constant flow pipe 16 are always connected in the gas path;

[0017] When the first three-way valve 601 is closed, the third end of the first three-way valve 601 is connected with the second end of the first three-way valve 601.

[0018] When the first three-way valve 601 is opened, the third end of the first three-way valve 601 is connected with the first end of the first three-way valve 601.

[0019] When the second three-way valve 602 is closed, the first end of the second three-way valve 602 is connected with the third end of the second three-way valve 602.

[0020] When the second three-way valve 602 is opened, the first end of the second three-way valve 602 is connected with the second end of the second three-way valve 602.

[0021] When the third three-way valve 603 is closed, the first end of the third three-way valve 603 is in communication with the second end of the third three-way valve 603;

[0022] When the third three-way valve 603 is opened, the first end of the third three-way valve 603 is in communication with the third end of the third three-way valve 603;

[0023] When the fourth three-way valve 604 is closed, the first end of the fourth three-way valve 604 is in communication with the second end of the fourth three-way valve 604;

[0024] When the fourth three-way valve 604 is opened, the first end of the fourth three-way valve 604 is in communication with the third end of the fourth three-way valve 604.

[0025] A degassing method of a full-automatic degassing device for insulating oil chromatography analysis as described above, by controlling the on-off sequence and time of the two-position two-way valve group 5, the two-position three-way valve group 6 and the vacuum pump 9, completing the gas washing process, the oil washing process, the sample degassing process and the oil discharge process.

[0026] The gas washing process comprises the following steps:

[0027] S1: sequentially perform the gas washing process: in the gas washing process, nitrogen is introduced into the pipeline through the nitrogen inlet pipe 13 for gas washing;

[0028] S1.1: through the total controller, open the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and close the other valves, the opening time is 2-10 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen discharge from the second interface of the six-way switching valve 7 through the fixed-point pressure stabilizing valve 8, the third two-way valve 503, the degassing chamber 4, the fourth two-way valve 504, the second three-way valve 602, the EPC proportional valve 11 and the metering tube 16;

[0029] S1.2: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and close the other valves; the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the degassing chamber 4, the first two-way valve 501 and the oil outlet pipe 2;

[0030] S1.3: Switch the six-way switch valve 7 to the first interface and the sixth interface, the second interface and the third interface, the fourth interface and the fifth interface, open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, and close the other valves; the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed, and the six-way switch valve 7 is switched to the initial state; nitrogen enters from the nitrogen inlet pipe 13, passes through the fixed point pressure stabilizing valve 8, and then passes through the third two-way valve 503, the degassing chamber 4 in turn on one route; passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the fifth interface of the six-way switch valve 7, the fourth interface of the six-way switch valve 7, the quantitative pipe 16, the first interface of the six-way switch valve 7, the sixth interface, the seventh two-way valve 507, the quantitative oil barrel 3, the second two-way valve 502 to the degassing chamber 4 on the second route; nitrogen flows out from the first two-way valve 501, realizing nitrogen cleaning of the quantitative pipe 16 and the degassing chamber 4;

[0031] S1.4: Open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602; the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; nitrogen passes through the fixed point pressure stabilizing valve 8, then passes through the third two-way valve 503 and the degassing chamber 4 on one route, and passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 to the sixth two-way valve 506 on the other route, enters the degassing chamber 4, and then flows out from the first two-way valve 501, so that nitrogen cleans the degassing chamber 4;

[0032] S1.5: Open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the third three-way valve 603 and the vacuum pump 9, the opening time is 40-80 seconds, after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump 9 is closed; negative pressure is drawn by the vacuum pump 9, so that the gas in the pipeline enters the degassing chamber 4 through the quantitative oil barrel 3 and the second two-way valve 502, and the gas in the sixth two-way valve 506 enters the degassing chamber 4, then passes through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the third three-way valve 603 from the degassing chamber 4 in turn, and is discharged through the venting pipeline 15, so that the entire degassing chamber 4 reaches a vacuum environment;

[0033] S1.6: open the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, the opening time is 2-10 seconds, after the set opening time is completed, the opened valves are automatically closed; after the nitrogen enters the fixed-point pressure stabilizing valve 8, one way passes through the third two-way valve 503, and the other way passes through the second three-way valve 602 and the fourth two-way valve 504 into the degassing chamber 4, so that the degassing chamber is filled with nitrogen;

[0034] S1.7: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; after the nitrogen enters the fixed-point pressure stabilizing valve 8, one way passes through the third two-way valve 503, and the other way passes through the second three-way valve 602 to the fourth two-way valve 504 into the degassing chamber 4, and is discharged from the first two-way valve 501, so that the degassing chamber 4 is washed by positive pressure;

[0035] S1.8: open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; after the nitrogen enters the fixed-point pressure stabilizing valve 8, one way passes through the third two-way valve 503 into the degassing chamber 4, and the other way passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switching valve 7, the seventh two-way valve 507, the fixed-volume oil tank 3, the second two-way valve 502 into the degassing chamber 4, so that the nitrogen flows out from the first two-way valve 501, and the fixed-volume oil tank 3 and the degassing chamber 4 are washed by nitrogen;

[0036] S1.9: open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, the opening time is 50-70 seconds; after the set opening time is completed, the opened valves are automatically closed; one way of the nitrogen enters the degassing chamber 4 through the third two-way valve 503, and the other way passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the sixth two-way valve 506 into the degassing chamber 4, and flows out from the first two-way valve 501, so that the degassing chamber 4 is washed by nitrogen, and the circulation gas washing is completed twice.

[0037] The oil washing process comprises the following steps:

[0038] S2: performing the oil washing process in sequence:

[0039] S2.1: opening the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the third three-way valve 603, and the vacuum pump 9, and closing other valves, the opening time being 20-40 seconds, after the set opening time is completed, automatically closing the opened valves and closing the vacuum pump 9; through the vacuum pump 9, negative pressure is drawn to make the gas in the pipeline pass through the second two-way valve 502, the degassing chamber 4, the sixth two-way valve 506, the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, and the third three-way valve 603, and finally pass through the venting pipeline 15 to be discharged, so that the entire degassing chamber 4 and the quantitative oil tank 3 reach a vacuum environment;

[0040] S2.2: opening the eighth two-way valve 508, the opening time being 20-40 seconds, after the set opening time is completed, automatically closing the opened valve; the oil inlet pipe 1 is used to feed oil, so that the oil enters the quantitative oil tank 3 through the eighth two-way valve 508;

[0041] S2.3: opening the second two-way valve 502, the opening time being 50-70 seconds, after the set opening time is completed, automatically closing the opened valve; the oil in the quantitative oil tank 3 enters the degassing chamber 4 through the second two-way valve 502, so as to realize oil transfer;

[0042] S2.4: opening the fourth two-way valve 504 and the second three-way valve 602, the opening time being 2-10 seconds, after the set opening time is completed, automatically closing the opened valve; nitrogen enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in sequence, so as to realize oil-gas balance;

[0043] S2.5: opening the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504, and the second three-way valve 602, the opening time being 80-100 seconds, after the set opening time is completed, automatically closing the opened valve; nitrogen enters the degassing chamber 4 through the third two-way valve 503 in one way, and enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in the other way, so as to discharge the oil from the degassing chamber 4 through the first two-way valve 501 from the oil outlet pipe 2; the oil is used to wash the degassing chamber 4 for the first time;

[0044] S2.6: open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed. The nitrogen gas passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switching valve 7, the seventh two-way valve 507, the quantitative oil barrel 3 and the second two-way valve 502 in sequence, enters the degassing chamber 4, passes through the third two-way valve 503, enters the degassing chamber 4, and finally is discharged from the first two-way valve 501, so as to realize cleaning of the quantitative oil barrel 3;

[0045] S2.7: open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed. The nitrogen gas enters the degassing chamber 4 through the third two-way valve 503, and the other route passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the sixth two-way valve 506, enters the degassing chamber 4, and is discharged from the first two-way valve 501, so as to complete the second cleaning of the degassing chamber 4;

[0046] S2.8: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the second three-way valve 602 and the third three-way valve 603, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed. The nitrogen gas passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, and is discharged from the vent line 15; the other route passes through the second three-way valve 602, the fourth two-way valve 504, the degassing chamber 4, the second two-way valve 502, the quantitative oil barrel 3, and reaches the seventh two-way valve 507, so as to complete the pressure holding detection of the entire gas circuit;

[0047] S2.9: open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507; the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switch valve 7, the seventh two-way valve 507, the quantitative oil barrel 3, the second two-way valve 502 in sequence on one way, and pass through the third two-way valve 503, the degassing chamber 4 on the other way, and finally be discharged from the first two-way valve 501, so as to realize the secondary cleaning of the quantitative oil barrel 3;

[0048] S2.10: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504, the sixth two-way valve 506 and the second three-way valve 602; the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the third two-way valve 503 into the degassing chamber 4 on one way, and pass through the second three-way valve 602, the fourth two-way valve 504 into the degassing chamber 4, flow into the sixth two-way valve 506 on the other way, and finally be discharged from the first two-way valve 501, so as to complete the third cleaning of the degassing chamber 4; at this time, the oil washing process is completed.

[0049] The forward sampling degassing process comprises the following steps:

[0050] S3: carry out the forward sampling degassing process in sequence:

[0051] S3.1 open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the seventh two-way valve 507 and the third three-way valve 603, and open the vacuum pump 9; the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump 9 is closed; through the vacuum pump 9, negative pressure is drawn to make the gas in the pipeline pass through the sixth two-way valve 506 on one way, pass through the degassing chamber 4, pass through the fourth three-way valve 604, the six-way switch valve 7, the seventh two-way valve 507, the quantitative oil barrel 3, the second two-way valve 502 in sequence on the other way, enter the degassing chamber 4, then pass through the fourth two-way valve 504, the fifth two-way valve 505 from the degassing chamber 4, and be discharged from the third three-way valve 603, so that the entire degassing chamber 4 and the quantitative oil barrel 3 reach a vacuum environment;

[0052] S3.2: open the eighth two-way valve 508, the opening time is 20-40 seconds, and after the set opening time is completed, the opened valve is automatically closed; the oil inlet pipe 1 is used to make the oil enter the quantitative oil bucket 3 through the eighth two-way valve 508;

[0053] S3.3: open the second two-way valve 502, the opening time is 50-70 seconds, and 60 seconds are the best; after the set opening time is completed, the opened valve is automatically closed; the oil in the quantitative oil bucket 3 enters the degassing chamber 4 through the second two-way valve 502, so that the oil is transferred;

[0054] S3.4: open the second three-way valve 602, the opening time is 1-3 seconds, and after the set opening time is completed, the opened valve is automatically closed; the nitrogen gas enters the pipeline connected with the valve passage through the second three-way valve 602, so that the pre-charging is realized;

[0055] S3.5: open the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506 and the first three-way valve 601, the opening time is 50-70 seconds, and after the set opening time is completed, the opened valve is automatically closed; the dissolved gas in the oil and the pre-charged nitrogen gas in step S3.4 enter the degassing chamber 4 in sequence through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the sixth two-way valve 506, so that the first small cycle degassing of the dissolved gas in the oil is realized;

[0056] S3.6: switch the six-way switch valve 7 to the first interface in communication with the sixth interface, the second interface in communication with the third interface, and the fourth interface in communication with the fifth interface, open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506 and the seventh two-way valve 507, the opening time is 50-70 seconds, and after the set opening time is completed, the opened valve is automatically closed, and the six-way switch valve 7 is switched to the initial state; the dissolved gas in the oil enters the fifth interface and the fourth interface of the six-way switch valve 7 in sequence through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, then enters the quantitative pipe 16, and then enters the quantitative oil bucket 3 through the first interface and the sixth interface of the six-way switch valve 7, the second two-way valve 502 and the degassing chamber 4, so that the first large cycle degassing of the dissolved gas in the oil is realized;

[0057] S3.7: open the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the vacuum pump 9, the opening time is 50-70 seconds, after the set opening time is completed, the opened valves are automatically closed, the vacuum pump 9 remains open, and the next step continues to be used; the oil dissolved gas passes through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the sixth two-way valve 506 in sequence to enter the degassing chamber 4, and the second small cycle degassing of the oil dissolved gas is performed;

[0058] S3.8, open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the seventh two-way valve 507 and the vacuum pump 9, the opening time is 50-70 seconds, after the set opening time is completed, the opened valves are automatically closed, the vacuum pump 9 remains open, and the next step continues to be used; the oil dissolved gas passes through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, enters the switching valve 7 after valve switching, enters the quantitative pipe 16, and then enters the quantitative oil tank 3 through the seventh two-way valve 507, enters the degassing chamber 4 from the second two-way valve 502, and realizes the second large cycle degassing of the oil dissolved gas;

[0059] S3.9, the six-way switching valve 7 is switched to the first interface and the sixth interface in communication, the second interface and the third interface in communication, and the fourth interface and the fifth interface in communication, the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506 and the vacuum pump 9 are opened, the opening time is 80-110 seconds, after the set opening time is completed, the opened valves are automatically closed, the vacuum pump 9 is closed, and the six-way switching valve 7 is switched to the initial state; the oil dissolved gas passes through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604 in sequence, enters the fifth interface and the fourth interface of the six-way switching valve 7, and then enters the quantitative pipe 16, to realize the pressure holding of the quantitative pipe 16;

[0060] S3.10, all valves of the two-position two-way valve group 5 and the two-position three-way valve group 6 and the vacuum pump 9 are closed, and the oil in the dosing tube 16 is allowed to stand for 2-10 seconds to reach an equilibrium state of dissolved gas, and the on-off valve 12 is opened to complete pressure relief in the device; S3.11, the six-way switching valve 7 is opened to place the six-way switching valve 7 in the initial state, and the opening time is 5-15 seconds, and after the set opening time is completed, the opened valves are automatically closed, and through the switching of the six-way switching valve 7, the gas in the dosing tube 16 enters the gas chromatograph for analysis, and then all the valves are closed, and the sample injection degassing process is completed.

[0061] The oil discharge process comprises the following steps:

[0062] S4: The oil discharge process is performed in the following order:

[0063] S4.1, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602 are opened, and the opening time is 2-10 seconds, and after the set opening time is completed, the opened valves are automatically closed; nitrogen gas enters the degassing chamber 4 through the third two-way valve 503, and the other route enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in turn, so that the degassing chamber is filled with nitrogen gas;

[0064] S4.2: The first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602 are opened, and the opening time is 50-70 seconds, and after the set opening time is completed, the opened valves are automatically closed; nitrogen gas enters the degassing chamber 4 through the third two-way valve 503, and the other route enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in turn, and is discharged from the first two-way valve 501, and the degassing chamber 4 is cleaned under positive pressure;

[0065] S4.3: Switch the six-way switch valve 7 to the first interface in communication with the sixth interface, the second interface in communication with the third interface, and the fourth interface in communication with the fifth interface, open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602, and the seventh two-way valve 507, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed, and the six-way switch valve 7 is switched to the initial state; one way of nitrogen gas enters the degassing chamber 4 through the third two-way valve 503, and the other way of nitrogen gas enters the degassing chamber 4 through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switch valve 7, the quantitative pipe 16, the seventh two-way valve 507, the quantitative oil tank 3, and the second two-way valve 502, so that the nitrogen gas flows out from the first two-way valve 501, and the quantitative pipe 16 and the degassing chamber 4 are first cleaned by nitrogen gas;

[0066] S4.4, open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601, and the second three-way valve 602, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed; one way of nitrogen gas enters the degassing chamber 4 through the third two-way valve 503; the other way of nitrogen gas enters the oil-gas separator 10 through the second three-way valve 602 and the fifth two-way valve 505, passes through the vacuum pump 9, the first three-way valve 601, and enters the degassing chamber 4 through the sixth two-way valve 506, and the nitrogen gas entering the degassing chamber 4 flows out from the first two-way valve 501, so that the degassing chamber 4 is first cleaned by nitrogen gas;

[0067] S4.5: Open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the seventh two-way valve 507, the third three-way valve 603, and the vacuum pump 9 to vacuumize, and the opening time is 110-130 seconds. After the set opening time is completed, the opened valves are automatically closed; the gas in the pipeline enters the third three-way valve 603 through the seventh two-way valve 507, the quantitative oil tank 3, the second two-way valve 502, the degassing chamber 4, the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, and is vented through the venting pipeline 15, so that the degassing chamber 4 and the entire gas circuit are first vacuumized.

[0068] S4.6: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, the opening time is 50-70 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the third two-way valve 503 into the degassing chamber 4, and the other pass through the second three-way valve 602 and the fourth two-way valve 504 into the degassing chamber 4 in turn, discharge the oil from the degassing chamber 4 through the first two-way valve 501 from the oil outlet pipe 2, and make the degassing chamber 4 perform the first cleaning;

[0069] S4.7: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the seventh two-way valve 507, the third three-way valve 603 and the vacuum pump 9, the opening time is 50-70 seconds, after the set opening time is completed, the opened valves are automatically closed; make the gas in the pipeline pass through the fourth three-way valve 604, the six-way switch valve 7, the seventh two-way valve 507, the quantitative oil barrel 3, the second two-way valve 502 into the degassing chamber 4 in turn, the gas in the sixth two-way valve 506 enters the degassing chamber 4, and then the gas in the degassing chamber 4 passes through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, enters the third three-way valve 603, and is discharged through the venting pipeline 15 to realize the second vacuumizing of the degassing chamber 4 and the whole gas circuit;

[0070] S4.8: open the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, the opening time is 2-10 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the third two-way valve 503 into the degassing chamber 4, and the other pass through the second three-way valve 602 and the fourth two-way valve 504 into the degassing chamber 4 in turn, so that the degassing chamber is filled with nitrogen;

[0071] S4.9: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed; nitrogen gas enters the degassing chamber 4 through the third two-way valve 503, the second three-way valve 602 and the fourth two-way valve 504, and is discharged from the first two-way valve 501, so as to positively wash the degassing chamber 4; S4.10: switch the six-way switching valve 7 to the state that the first interface communicates with the sixth interface, the second interface communicates with the third interface, and the fourth interface communicates with the fifth interface, open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, and the opening time is 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed, and the six-way switching valve 7 is switched to the initial state; nitrogen gas passes through the third two-way valve 503 and the degassing chamber 4 in one way, and passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switching valve 7, the quantitative pipe 16, the seventh two-way valve 507, the quantitative oil bucket 3 and the second two-way valve 502 in the other way, and then enters the degassing chamber 4, so that the nitrogen gas flows out of the first two-way valve 501, and the quantitative pipe 16 and the degassing chamber 4 are washed by nitrogen gas for the second time;

[0072] S4.11: open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, and the opening time is 50-70 seconds. After the set opening time is completed, the opened valves are automatically closed; nitrogen gas passes through the third two-way valve 503 into the degassing chamber 4 in one way, and passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the sixth two-way valve 506 into the degassing chamber 4 in the other way, and then flows out of the first two-way valve 501, so that the degassing chamber 4 is washed by nitrogen gas for the second time; thus, the oil discharging process is completed.

[0073] The beneficial effects of the present application are that the quantitative oil bucket, the degassing chamber, the vacuum pump, the oil-gas separator and the control valve assembly are connected through the pipeline assembly to form the gas washing pipeline passage, the oil washing pipeline passage, the degassing pipeline passage and the oil discharge pipeline passage; that is, the control of multiple operations such as gas washing, oil washing, sample degassing and oil discharge can be realized, the operation method is simple, convenient and fast, and the total controller can be linked with the terminal such as the workstation control device to realize complete degassing automation, achieve the liberation of manpower and improve the working efficiency of the entire chromatographic detection. In addition, the degassing device has simple internal structure, strict control of the vacuum degree of the device and high reliability, and has good popularization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0074] Fig. 1 is a schematic diagram of the pipeline connection relationship structure of the present application.

[0075] Fig. 2 is a schematic diagram of the structural relationship of the device of the present application.

[0076] Fig. 3 is a schematic diagram of the pipeline connection after the six-way switching valve 7 is switched in steps S1.3, S3.6, S3.9 and S4.10 of the present application.

[0077] 1, oil inlet pipe; 2, oil outlet pipe; 3, quantitative oil bucket; 301, first outlet passage; 302, second outlet passage;

[0078] 4, degassing chamber; 401, first outlet; 402, second outlet; 403, third outlet; 404, first inlet; 405, second inlet;

[0079] 5, two-position two-way valve group; 501, first two-way valve; 502, second two-way valve; 503, third two-way valve; 504, fourth two-way valve; 505, fifth two-way valve; 506, sixth two-way valve; 507, seventh two-way valve; 508, eighth two-way valve;

[0080] 6, two-position three-way valve group; 601, first three-way valve; 602, second three-way valve; 603, third three-way valve; 604, fourth three-way valve; 7, six-way switching valve; 8, fixed-point pressure stabilizing valve; 9, vacuum pump; 10, oil-gas separator; 11, EPC proportional valve. DETAILED DESCRIPTION

[0081] According to figures 1-3, the application is a full-automatic degassing device for insulating oil chromatography analysis, which comprises a total controller connected with a workstation terminal through a communication interface, and an oil inlet pipe 1, an oil outlet pipe 2, a quantitative oil tank 3, a degassing chamber 4, a vacuum pump 9, an oil-gas separator 10 and a control valve assembly connected through a pipe assembly; the total controller is electrically connected with the control valve assembly and the vacuum pump 9 respectively, and controls the switching of the on-off state of the control valve assembly and the switching of the vacuum pump 9.

[0082] The control valve assembly comprises a two-position two-way valve group 5, a two-position three-way valve group 6, a six-way switching valve 7, a fixed-point pressure stabilizing valve 8 and an EPC proportional valve 11; the two-position two-way valve group 5 comprises a first two-way valve 501, a second two-way valve 502, a third two-way valve 503, a fourth two-way valve 504, a fifth two-way valve 505, a sixth two-way valve 506, a seventh two-way valve 507 and an eighth two-way valve 508; the two-position three-way valve group 6 comprises a first three-way valve 601, a second three-way valve 602, a third three-way valve 603 and a fourth three-way valve 604.

[0083] The inlet channel of the quantitative oil tank 3 is connected with the oil inlet pipe 1 through the eighth two-way valve 508, the first outlet channel 301 of the quantitative oil tank 3 is connected with the first inlet 404 of the degassing chamber 4 through the second two-way valve 502, and the second outlet channel 302 of the quantitative oil tank 3 is connected with the sixth interface of the six-way switching valve 7 through the seventh two-way valve 507.

[0084] The second inlet 405 of the degassing chamber 4 is connected with one end of the third two-way valve 503, the other end of the third two-way valve 503 is connected with one end of the fixed-point pressure stabilizing valve 8, the first end of the second three-way valve 602 and one end of the EPC proportional valve 11 respectively; the other end of the fixed-point pressure stabilizing valve 8 is connected with a nitrogen inlet pipe 13; the other end of the EPC proportional valve 11 is connected with the third interface of the six-way switching valve 7.

[0085] The first outlet 401 of the degassing chamber 4 is connected with the oil outlet pipe 2 through the first two-way valve 501.

[0086] The second outlet 402 of the degassing chamber 4, the sixth two-way valve 506, the first end of the first three-way valve 601, the second end of the first three-way valve 601, the first end of the third three-way valve 603, the second end of the third three-way valve 603, the first end of the fourth three-way valve 604, the second end of the fourth three-way valve 604, and the fifth interface of the six-way switching valve 7 are sequentially connected; the third end of the third three-way valve 603 and the third end of the fourth three-way valve 604 are respectively connected with the vent line 15;

[0087] The third end of the first three-way valve 601, the vacuum pump 9, the oil-gas separator 10, and one end of the fifth two-way valve 505 are sequentially connected, the other end of the fifth two-way valve 505 is connected with the second end of the second three-way valve 602 and one end of the fourth two-way valve 504, and the other end of the fourth two-way valve 504 is connected with the third outlet 403 of the degassing chamber 4;

[0088] The first interface of the six-way switching valve 7 is connected with the fourth interface of the six-way switching valve 7 through the constant flow pipe 16; in the initial state, the first interface of the six-way switching valve 7 is connected with the second interface, the third interface is connected with the fourth interface, and the fifth interface is connected with the sixth interface.

[0089] The total controller controls the switching of the on-off state of the control valve assembly, forms four switchable working pipeline passages, and the four working pipeline passages are: a gas washing pipeline passage, an oil washing pipeline passage, a degassing pipeline passage, and an oil discharge pipeline passage.

[0090] The gas washing pipeline passage includes a first gas washing passage and a second gas washing passage, and the seventh two-way valve 507 and the six-way switching valve 7 are connected with the first pressure sensor 12.

[0091] The second inlet 405 of the degassing chamber 4 and the third two-way valve 503 are connected with the second pressure sensor 14.

[0092] When the vacuum pump 9 is closed, the gas path is directly connected with the vacuum pump 9; the oil-gas separator 10, the EPC proportional valve 11, and the constant flow pipe 16 are always connected in the gas path;

[0093] When the first three-way valve 601 is closed, the third end of the first three-way valve 601 is connected with the second end of the first three-way valve 601;

[0094] When the first three-way valve 601 is opened, the third end of the first three-way valve 601 is connected with the first end of the first three-way valve 601;

[0095] When the second three-way valve 602 is closed, the first end of the second three-way valve 602 communicates with the third end of the second three-way valve 602;

[0096] When the second three-way valve 602 is opened, the first end of the second three-way valve 602 communicates with the second end of the second three-way valve 602;

[0097] When the third three-way valve 603 is closed, the first end of the third three-way valve 603 communicates with the second end of the third three-way valve 603;

[0098] When the third three-way valve 603 is opened, the first end of the third three-way valve 603 communicates with the third end of the third three-way valve 603;

[0099] When the fourth three-way valve 604 is closed, the first end of the fourth three-way valve 604 communicates with the second end of the fourth three-way valve 604;

[0100] When the fourth three-way valve 604 is opened, the first end of the fourth three-way valve 604 communicates with the third end of the fourth three-way valve 604.

[0101] The arrow direction of the first three-way valve 601, the second three-way valve 602, the third three-way valve 603, and the fourth three-way valve 604 in FIG. 1 and FIG. 3 is the flow direction when the four valves are closed, respectively.

[0102] A degassing method of a full-automatic degassing device for insulating oil chromatography as described above, by controlling the sequence and time of opening and closing of the two-position two-way valve group 5, the two-position three-way valve group 6, and the vacuum pump 9, the gas washing process, the oil washing process, the sample degassing process, and the oil discharge process are completed.

[0103] The gas washing process includes the following steps:

[0104] S1: sequentially perform the gas washing process: in the gas washing process, nitrogen is introduced through the nitrogen inlet pipe 13 to wash the pipeline with nitrogen.

[0105] S1.1: open the third two-way valve 503, the fourth two-way valve 504, and the second three-way valve 602 through the total controller; other valves are closed; the opening time is 2-10 seconds, preferably 5 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes nitrogen flow from the nitrogen inlet pipe 13 through the fixed-point pressure stabilizing valve 8, the third two-way valve 503, the degassing chamber 4, the fourth two-way valve 504, the second three-way valve 602, the EPC proportional valve 11, the fixed-volume tube 16, and the second interface of the six-way switching valve 7 in sequence.

[0106] S1.2: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602; other valves are closed; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes nitrogen pass through the degassing chamber 4, the first two-way valve 501 and the oil outlet pipe 2.

[0107] S1.3: switch the six-way switch valve 7 to a state that the first interface communicates with the sixth interface, the second interface communicates with the third interface, and the fourth interface communicates with the fifth interface; open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507; other valves are closed; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed, and the six-way switch valve 7 is switched to the initial state.

[0108] This step makes nitrogen enter from the nitrogen inlet pipe 13, pass through the fixed-point pressure stabilizing valve 8, and then pass through the third two-way valve 503 and the degassing chamber 4 in sequence in one way; pass through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the fifth interface of the six-way switch valve 7, the fourth interface of the six-way switch valve 7, the metering pipe 16, the first interface of the six-way switch valve 7, the sixth interface, the seventh two-way valve 507, the metering oil barrel 3 and the second two-way valve 502 in sequence in the other way to reach the degassing chamber 4; so that nitrogen flows out from the first two-way valve 501, realizing nitrogen cleaning of the metering pipe 16 and the degassing chamber 4.

[0109] S1.4: open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes nitrogen pass through the fixed-point pressure stabilizing valve 8, then pass through the third two-way valve 503 and the degassing chamber 4 in one way, and pass through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the sixth two-way valve 506 in the other way to enter the degassing chamber 4, and then flow out from the first two-way valve 501, so that nitrogen cleans the degassing chamber 4.

[0110] S1.5: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the third three-way valve 603 and the vacuum pump 9, and the opening time is 40-80 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump 9 is closed. In this step, the vacuum pump 9 is used to draw negative pressure, so that the gas in the pipeline enters the degassing chamber 4 through the quantitative oil drum 3, the second two-way valve 502, and the gas in the sixth two-way valve 506 enters the degassing chamber 4, and then enters the degassing chamber 4 from the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the third three-way valve 603, and is discharged through the venting pipeline 15, so that the entire degassing chamber 4 reaches a vacuum environment.

[0111] S1.6: open the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 2-10 seconds, preferably 5 seconds; after the set opening time is completed, the opened valves are automatically closed. In this step, after the nitrogen enters the fixed-point pressure stabilizing valve 8, one way passes through the third two-way valve 503, and the other way passes through the second three-way valve 602 and the fourth two-way valve 504 into the degassing chamber 4, so that the degassing chamber is filled with nitrogen.

[0112] S1.7: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. In this step, the nitrogen enters the fixed-point pressure stabilizing valve 8, one way passes through the third two-way valve 503, and the other way passes through the second three-way valve 602 to the fourth two-way valve 504 into the degassing chamber 4, and is discharged from the first two-way valve 501, which pressurizes and cleans the degassing chamber 4.

[0113] S1.8: open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen enter the fixed-point pressure stabilizing valve 8 through the third two-way valve 503 into the degassing chamber 4, and the other way is sequentially through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switching valve 7, the seventh two-way valve 507, the quantitative oil barrel 3, the second two-way valve 502 into the degassing chamber 4, so that the nitrogen flows out from the first two-way valve 501, realizing the nitrogen cleaning of the quantitative oil barrel 3 and the degassing chamber 4.

[0114] S1.9: open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen enter the degassing chamber 4 through the third two-way valve 503, and the other way is sequentially through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the sixth two-way valve 506 into the degassing chamber 4, and flows out from the first two-way valve 501, so that the nitrogen cleans the degassing chamber 4, and completes the circulation gas washing twice.

[0115] The oil washing process comprises the following steps: S2: sequentially performing the oil washing process:

[0116] S2.1: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the third three-way valve 603 and the vacuum pump 9, and the other valves are closed, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump 9 is closed. This step makes the gas in the pipeline pass through the second two-way valve 502, the degassing chamber 4, the sixth two-way valve 506, the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601 and the third three-way valve 603 through the vacuum pump 9, and finally discharged through the venting pipeline 15, so that the entire degassing chamber 4 and the quantitative oil barrel 3 reach a vacuum environment.

[0117] S2.2: open the eighth two-way valve 508, the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valve is automatically closed. In this step, the oil in the oil inlet pipe 1 enters the quantitative oil tank 3 through the eighth two-way valve 508.

[0118] S2.3: open the second two-way valve 502, the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valve is automatically closed. In this step, the oil in the quantitative oil tank 3 enters the degassing chamber 4 through the second two-way valve 502, realizing the transfer of the oil.

[0119] S2.4: open the fourth two-way valve 504 and the second three-way valve 602, the opening time is 2-10 seconds, preferably 5 seconds; after the set opening time is completed, the opened valve is automatically closed. In this step, the nitrogen enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in turn, realizing the balance of the oil and gas.

[0120] S2.5: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, the opening time is 80-100 seconds, preferably 90 seconds; after the set opening time is completed, the opened valve is automatically closed. In this step, the nitrogen enters the degassing chamber 4 through the third two-way valve 503, and the other way enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in turn, and the oil is discharged from the oil outlet pipe 2 through the first two-way valve 501; the oil is washed in the degassing chamber 4 for the first time.

[0121] S2.6: open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valve is automatically closed. In this step, the nitrogen enters the degassing chamber 4 through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switching valve 7, the seventh two-way valve 507, the quantitative oil tank 3 and the second two-way valve 502 in turn, and the other way enters the degassing chamber 4 through the third two-way valve 503, and finally is discharged from the first two-way valve 501, realizing the cleaning of the quantitative oil tank 3.

[0122] S2.7: open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen pass through the third two-way valve 503 into the degassing chamber 4, and the other way passes through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the sixth two-way valve 506, enters the degassing chamber 4, and is discharged from the first two-way valve 501, completing the second cleaning of the degassing chamber 4.

[0123] S2.8: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the second three-way valve 602 and the third three-way valve 603, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen pass through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, and is discharged from the vent line 15; the other way passes through the second three-way valve 602, the fourth two-way valve 504, the degassing chamber 4, the second two-way valve 502, the metering oil tank 3, and reaches the seventh two-way valve 507, completing the pressure holding detection of the entire gas circuit.

[0124] S2.9: open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen pass through the second three-way valve 602, pass through the fifth two-way valve 505, pass through the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switch valve 7, the seventh two-way valve 507, the metering oil tank 3, the second two-way valve 502 into the degassing chamber 4, and the other way passes through the third two-way valve 503, the degassing chamber 4, and is finally discharged from the first two-way valve 501, realizing the secondary cleaning of the metering oil tank 3.

[0125] S2.10: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504, the sixth two-way valve 506 and the second three-way valve 602; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen gas enter the degassing chamber 4 through the third two-way valve 503, and enter the degassing chamber 4 through the second three-way valve 602, the fourth two-way valve 504, flow into the sixth two-way valve 506, and finally be discharged from the first two-way valve 501, completing the third cleaning of the degassing chamber 4; at this point, the oil washing process is completed.

[0126] The forward sample degassing process comprises the following steps:

[0127] S3.1: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the seventh two-way valve 507 and the third three-way valve 603, and open the vacuum pump 9; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump 9 is closed. This step uses the vacuum pump 9 to create a negative pressure in the pipeline, so that the gas in the pipeline enters the degassing chamber 4 from the sixth two-way valve 506, and then enters the degassing chamber 4 from the fourth three-way valve 604, the six-way switch valve 7, the seventh two-way valve 507, the quantitative oil bucket 3, the second two-way valve 502 in sequence, and then is discharged from the third three-way valve 603, so that the entire degassing chamber 4 and the quantitative oil bucket 3 reach a vacuum environment.

[0128] S3.2: open the eighth two-way valve 508; the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valve is automatically closed. This step makes the oil in the oil inlet pipe 1 enter the quantitative oil bucket 3 through the eighth two-way valve 508.

[0129] S3.3: open the second two-way valve 502; the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valve is automatically closed. This step makes the oil in the quantitative oil bucket 3 enter the degassing chamber 4 through the second two-way valve 502, realizing the transfer of the oil.

[0130] S3.4: open the second three-way valve 602; the opening time is 1-3 seconds, preferably 2 seconds; after the set opening time is completed, the opened valve is automatically closed. This step makes the nitrogen gas enter the pipeline connected by the valve channel through the second three-way valve 602, realizing pre-charging.

[0131] S3.5: open the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506 and the first three-way valve 601, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the dissolved gas in the oil, the pre-charged nitrogen in step S3.4 pass through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the sixth two-way valve 506 in turn, and enter the degassing chamber 4 for the first small cycle degassing of the dissolved gas in the oil.

[0132] S3.6: switch the six-way switching valve 7 to the first interface in communication with the sixth interface, the second interface in communication with the third interface, and the fourth interface in communication with the fifth interface, open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506 and the seventh two-way valve 507, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed, and the six-way switching valve 7 is switched to the initial state. This step makes the dissolved gas in the oil pass through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, enter the fifth interface and the fourth interface of the six-way switching valve 7, then enter the dosing tube 16, pass through the first interface and the sixth interface of the six-way switching valve 7 again, enter the dosing tank 3 through the seventh two-way valve 507, and enter the degassing chamber 4 from the second two-way valve 502, to realize the first large cycle degassing of the dissolved gas in the oil.

[0133] S3.7: open the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the vacuum pump 9, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump 9 remains in the open state and is continuously used in the next step. This step makes the dissolved gas in the oil pass through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the sixth two-way valve 506 in turn, and enter the degassing chamber 4 for the second small cycle degassing of the dissolved gas in the oil.

[0134] S3.8, open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the seventh two-way valve 507 and the vacuum pump 9, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed, the vacuum pump 9 remains open, and the next step continues to be used. This step makes the dissolved gas in the oil pass through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, enter the switching valve 7 after valve switching, enter the quantitative tube 16, then enter the quantitative oil tank 3 through the seventh two-way valve 507, enter the degassing chamber 4 from the second two-way valve 502, and realize the second large circulation degassing of the dissolved gas in the oil.

[0135] S3.9, switch the six-way switching valve 7 to the first interface in communication with the sixth interface, the second interface in communication with the third interface, and the fourth interface in communication with the fifth interface, open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506 and the vacuum pump 9, and the opening time is 80-110 seconds, preferably 90 seconds; after the set opening time is completed, the opened valves are automatically closed, the vacuum pump 9 is closed, and the six-way switching valve 7 is switched to the initial state. This step makes the dissolved gas in the oil pass through the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, enter the fifth interface and the fourth interface of the six-way switching valve 7, and then enter the quantitative tube 16, to realize the pressure holding of the quantitative tube 16.

[0136] S3.10, all valves of the two-position two-way valve group 5 and the two-position three-way valve group 6, and the vacuum pump 9 are closed, and stand still for 2-10 seconds, preferably 5 seconds. This step makes the dissolved gas in the oil in the quantitative tube 16 reach an equilibrium state; and the switch valve 12 is opened, to complete the pressure relief in the device.

[0137] S3.11, open the six-way switching valve 7, so that the six-way switching valve 7 is in the initial state, and the opening time is 5-15 seconds, preferably 10 seconds; after the set opening time is completed, the opened valve is automatically closed. This step makes the gas in the quantitative tube 16 enter the gas chromatograph for analysis through the switching of the six-way switching valve 7; then all the valves are closed, and the sampling and degassing process is completed.

[0138] The oil discharge process includes the following steps:

[0139] S4: perform the oil discharge process in order:

[0140] S4.1, open the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 2-10 seconds, preferably 5 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes nitrogen enter the degassing chamber 4 through the third two-way valve 503, and the other way enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in turn, so that the degassing chamber is filled with nitrogen.

[0141] S4.2: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes nitrogen enter the degassing chamber 4 through the third two-way valve 503, and the other way enters the degassing chamber 4 through the second three-way valve 602 and the fourth two-way valve 504 in turn, and then is discharged from the first two-way valve 501, which cleans the degassing chamber 4 under positive pressure.

[0142] S4.3: switch the six-way switch valve 7 to the first interface in communication with the sixth interface, the second interface in communication with the third interface, and the fourth interface in communication with the fifth interface, open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, and the opening time is 20-40 seconds, preferably 30 seconds. After the set opening time of this step is completed, the opened valves are automatically closed, and the six-way switch valve 7 is switched to the initial state; nitrogen enters the degassing chamber 4 through the third two-way valve 503, and the other way enters the degassing chamber 4 through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switch valve 7, the metering pipe 16, the seventh two-way valve 507, the metering oil tank 3, the second two-way valve 502 in turn, so that nitrogen flows out from the first two-way valve 501, realizing the first cleaning of the metering pipe 16 and the degassing chamber 4 by nitrogen.

[0143] S4.4, open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen enter the degassing chamber 4 through the third two-way valve 503; another route of nitrogen enters the oil-gas separator 10 through the second three-way valve 602, the fifth two-way valve 505, the vacuum pump 9, the first three-way valve 601, and the sixth two-way valve 506, and the nitrogen entering the degassing chamber 4 flows out from the first two-way valve 501, so that the nitrogen first cleans the degassing chamber 4.

[0144] S4.5: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the seventh two-way valve 507, the third three-way valve 603 and the vacuum pump 9 to perform vacuumizing, and the opening time is 110-130 seconds, preferably 120 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the gas in the pipeline sequentially pass through the seventh two-way valve 507, the quantitative oil tank 3, the second two-way valve 502, the degassing chamber 4, the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, enters the third three-way valve 603, passes through the venting pipeline 15 to be vented, and realizes the first vacuumizing of the degassing chamber 4 and the entire gas circuit.

[0145] S4.6: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen pass through the third two-way valve 503 into the degassing chamber 4, and another route sequentially passes through the second three-way valve 602 and the fourth two-way valve 504 into the degassing chamber 4, and the oil from the degassing chamber 4 is discharged from the oil outlet pipe 2 through the first two-way valve 501, so that the degassing chamber 4 is first cleaned.

[0146] S4.7: open the second two-way valve 502, the fourth two-way valve 504, the fifth two-way valve 505, the sixth two-way valve 506, the seventh two-way valve 507, the third three-way valve 603 and the vacuum pump 9, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the gas in the pipeline enter the degassing chamber 4 from the fourth three-way valve 604, the six-way switching valve 7, the seventh two-way valve 507, the quantitative oil drum 3, the second two-way valve 502 in turn, the gas in the sixth two-way valve 506 enters the degassing chamber 4, and then the gas in the degassing chamber 4 enters the fourth two-way valve 504, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603 in turn, and is discharged through the venting pipeline 15 to realize the second vacuumizing of the degassing chamber 4 and the entire gas circuit.

[0147] S4.8: open the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 2-10 seconds, preferably 5 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen enter the degassing chamber 4 through the third two-way valve 503 in one way, and enters the degassing chamber 4 from the second three-way valve 602, the fourth two-way valve 504 in turn in another way, so that the degassing chamber is filled with nitrogen.

[0148] S4.9: open the first two-way valve 501, the third two-way valve 503, the fourth two-way valve 504 and the second three-way valve 602, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen enter the degassing chamber 4 through the third two-way valve 503, the second three-way valve 602, the fourth two-way valve 504, and is discharged from the first two-way valve 501 to clean the degassing chamber 4 under positive pressure.

[0149] S4.10: Switch the six-way switch valve 7 to a state that the first interface communicates with the sixth interface, the second interface communicates with the third interface, and the fourth interface communicates with the fifth interface, open the first two-way valve 501, the second two-way valve 502, the third two-way valve 503, the fifth two-way valve 505, the second three-way valve 602 and the seventh two-way valve 507, and the opening time is 20-40 seconds, preferably 30 seconds; after the set opening time is completed, the opened valves are automatically closed, and the six-way switch valve 7 is switched to the initial state. This step makes the nitrogen pass through the third two-way valve 503, the degassing chamber 4 in one way, and pass through the second three-way valve 602, the fifth two-way valve 505, the oil-gas separator 10, the vacuum pump 9, the first three-way valve 601, the third three-way valve 603, the fourth three-way valve 604, the six-way switch valve 7, the quantitative pipe 16, the seventh two-way valve 507, the quantitative oil bucket 3, the second two-way valve 502 in turn in the other way, and then enter the degassing chamber 4, so that the nitrogen flows out from the first two-way valve 501, realizing the second cleaning of the quantitative pipe 16 and the degassing chamber 4 by nitrogen.

[0150] S4.11: Open the first two-way valve 501, the third two-way valve 503, the fifth two-way valve 505, the sixth two-way valve 506, the first three-way valve 601 and the second three-way valve 602, and the opening time is 50-70 seconds, preferably 60 seconds; after the set opening time is completed, the opened valves are automatically closed. This step makes the nitrogen pass through the third two-way valve 503 into the degassing chamber 4 in one way, and pass through the second three-way valve 602, the fifth two-way valve 505 into the oil-gas separator 10, the vacuum pump 9, through the first three-way valve 601, the sixth two-way valve 506 into the degassing chamber 4 in the other way, and then flow out from the first two-way valve 501, so that the nitrogen cleans the degassing chamber 4 for the second time; at this time, the oil discharging process is completed.

Claims

1. A full-automatic degassing device for chromatographic analysis of insulating oil, comprising a total controller connected with a work station terminal through a communication interface, characterized in that: It also includes an oil inlet pipe (1), an oil outlet pipe (2), a quantitative oil tank (3), a degassing chamber (4), a vacuum pump (9), an oil-gas separator (10) and a control valve assembly connected through the pipeline assembly; the total controller is electrically connected with the control valve assembly, the vacuum pump (9) respectively, and controls the switching of the on-off state of the control valve assembly and the opening and closing of the vacuum pump (9); The control valve assembly includes a two-position two-way valve group (5), a two-position three-way valve group (6), a six-way switching valve (7), a fixed-point pressure stabilizing valve (8) and an EPC proportional valve (11); the two-position two-way valve group (5) includes a first two-way valve (501), a second two-way valve (502), a third two-way valve (503), a fourth two-way valve (504), a fifth two-way valve (505), a sixth two-way valve (506), a seventh two-way valve (507) and an eighth two-way valve (508); the two-position three-way valve group (6) includes a first three-way valve (601), a second three-way valve (602), a third three-way valve (603) and a fourth three-way valve (604); The inlet channel of the quantitative oil tank (3) is connected with the oil inlet pipe (1) through the eighth two-way valve (508), the first outlet channel (301) of the quantitative oil tank (3) is connected with the first inlet (404) of the degassing chamber (4) through the second two-way valve (502), and the second outlet channel (302) of the quantitative oil tank (3) is connected with the sixth interface of the six-way switching valve (7) through the seventh two-way valve (507); The second inlet (405) of the degassing chamber (4) is connected with one end of the third two-way valve (503), the other end of the third two-way valve (503) is connected in communication with one end of the fixed-point pressure stabilizing valve (8), the first end of the second three-way valve (602) and one end of the EPC proportional valve (11) respectively; the other end of the fixed-point pressure stabilizing valve (8) is connected with a nitrogen inlet pipe (13); the other end of the EPC proportional valve (11) is connected with the third interface of the six-way switching valve (7); The first outlet (401) of the degassing chamber (4) is connected with the oil outlet pipe (2) through the first two-way valve (501); The second outlet (402) of the degassing chamber (4), the sixth two-way valve (506), the first end of the first three-way valve (601), the second end of the first three-way valve (601), the first end of the third three-way valve (603), the second end of the third three-way valve (603), the first end of the fourth three-way valve (604), the second end of the fourth three-way valve (604) and the fifth interface of the six-way switching valve (7) are sequentially connected; the third end of the third three-way valve (603) and the third end of the fourth three-way valve (604) are respectively connected with a vent line (15). The third end of the first three-way valve (601), the vacuum pump (9), the oil-gas separator (10), and one end of the fifth two-way valve (505) are sequentially connected, the other end of the fifth two-way valve (505) is connected with the second end of the second three-way valve (602) and one end of the fourth two-way valve (504) respectively, and the other end of the fourth two-way valve (504) is connected with the third outlet (403) of the degassing chamber (4). The first interface of the six-way switching valve (7) is connected with the fourth interface of the six-way switching valve (7) through the constant flow pipe (16); in the initial state, the first interface of the six-way switching valve (7) is connected with the second interface, the third interface is connected with the fourth interface, and the fifth interface is connected with the sixth interface. The total controller controls the switching of the on-off state of the control valve assembly, forming four switchable working pipeline passages, and the four working pipeline passages are a gas washing pipeline passage, an oil washing pipeline passage, a degassing pipeline passage, and an oil discharge pipeline passage. The degassing pipeline passage includes a small cycle degassing passage and a large cycle degassing passage. The small cycle degassing passage includes a passage sequentially connected between the degassing chamber (4), the third outlet (403) of the degassing chamber (4), the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the sixth two-way valve (506), the second outlet (402) of the degassing chamber (4), and the degassing chamber (4); and the large cycle degassing passage includes a passage sequentially connected between the degassing chamber (4), the third outlet (403) of the degassing chamber (4), the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the fifth interface of the six-way switching valve (7), the fourth interface of the six-way switching valve (7), the constant flow pipe (16), the first interface of the six-way switching valve (7), the sixth interface of the six-way switching valve (7), the seventh two-way valve (507), the constant oil barrel (3), the second two-way valve (502), and the degassing chamber (4). The small cycle degassing passage and the large cycle degassing passage are alternately degassed.

2. A fully automatic degassing device for chromatographic analysis of insulating oil according to claim 1, characterized in that: The degassing pipeline passage further includes a sample degassing pipeline, and after the small cycle degassing passage and the large cycle degassing passage are alternately degassed, the gas enters the gas chromatograph for analysis through the sample degassing pipeline. The sample degassing pipeline is sequentially connected between the degassing chamber (4), the third outlet (403) of the degassing chamber (4), the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the fifth interface of the six-way switching valve (7), the fourth interface of the six-way switching valve (7), the constant flow pipe (16), the first interface of the six-way switching valve (7), and the second interface of the six-way switching valve (7).

3. A fully automatic degassing device for chromatographic analysis of insulating oil according to claim 1, characterized in that: The degassing pipeline passage further comprises a sample inlet pipeline, which comprises an oil inlet pipe (1), an eighth two-way valve (508), a constant oil tank (3), a second two-way valve (502) and a degassing chamber (4) connected in sequence.

4. A fully automatic degassing device for chromatographic analysis of insulating oil according to claim 1, characterized in that: The gas washing pipeline passage comprises a first gas washing passage and a second gas washing passage, and a first pressure sensor (12) is connected between the seventh two-way valve (507) and the six-way switching valve (7).

5. A fully automatic degassing device for chromatographic analysis of insulating oil according to claim 1, characterized in that: A second pressure sensor (14) is connected between the second inlet (405) of the degassing chamber (4) and the third two-way valve (503).

6. A fully automatic degassing device for chromatographic analysis of insulating oil according to claim 1, characterized in that: When the vacuum pump (9) is closed, the gas path is directly connected to the vacuum pump (9); the oil-gas separator (10), the EPC proportional valve (11) and the constant tube (16) are always connected in the gas path; When the first three-way valve (601) is closed, the third end of the first three-way valve (601) is connected to the second end of the first three-way valve (601); when the first three-way valve (601) is opened, the third end of the first three-way valve (601) is connected to the first end of the first three-way valve (601); When the second three-way valve (602) is closed, the first end of the second three-way valve (602) is connected to the third end of the second three-way valve (602); when the second three-way valve (602) is opened, the first end of the second three-way valve (602) is connected to the second end of the second three-way valve (602); When the third three-way valve (603) is closed, the first end of the third three-way valve (603) is connected to the second end of the third three-way valve (603); when the third three-way valve (603) is opened, the first end of the third three-way valve (603) is connected to the third end of the third three-way valve (603); When the fourth three-way valve (604) is closed, the first end of the fourth three-way valve (604) is connected to the second end of the fourth three-way valve (604); when the fourth three-way valve (604) is opened, the first end of the fourth three-way valve (604) is connected to the third end of the fourth three-way valve (604).

7. A method for degassing of a full-automatic degassing device for chromatographic analysis of insulating oil according to any one of claims 1 to 6, characterized in that: By controlling the sequence and time of opening and closing of the two-position two-way valve group (5), the two-position three-way valve group (6) and the vacuum pump (9), the gas washing process, the oil washing process, the sample degassing process and the oil discharge process are completed.

8. The degassing method of a full-automatic degassing device for chromatographic analysis of insulating oil according to claim 7, characterized in that: The gas washing process comprises the following steps: S1: sequentially perform the gas washing process: in the gas washing process, nitrogen is introduced into the pipeline through the nitrogen inlet pipe (13); S1.1: open the third two-way valve (503), the fourth two-way valve (504) and the second three-way valve (602) through the total controller; other valves are closed, the opening time is 2-10 seconds, and after the set opening time is completed, the opened valves are automatically closed; nitrogen is discharged from the second interface of the six-way switching valve (7) through the constant pressure valve (8), the third two-way valve (503), the degassing chamber (4), the fourth two-way valve (504), the second three-way valve (602), the EPC proportional valve (11) and the constant tube (16); S1.2: open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504) and the second three-way valve (602), and close other valves, the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; nitrogen gas passes through the degassing chamber (4), the first two-way valve (501) and the oil outlet pipe (2); S1.3: switch the six-way switch valve (7) to the first interface and the sixth interface in communication, the second interface and the third interface in communication, the fourth interface and the fifth interface in communication, open the first two-way valve (501), the second two-way valve (502), the third two-way valve (503), the fifth two-way valve (505), the second three-way valve (602) and the seventh two-way valve (507), and close other valves, the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed, and the six-way switch valve (7) is switched to the initial state; nitrogen gas enters from the nitrogen inlet pipe (13), passes through the fixed-point pressure stabilizing valve (8), and then passes through the third two-way valve (503), the degassing chamber (4) in sequence along one path; passes through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the fifth interface of the six-way switch valve (7), the fourth interface of the six-way switch valve (7), the quantitative pipe (16), the first interface of the six-way switch valve (7), the sixth interface, the seventh two-way valve (507), the quantitative oil barrel (3), the second two-way valve (502) in sequence along another path to reach the degassing chamber (4), so that nitrogen gas flows out from the first two-way valve (501), realizing nitrogen cleaning of the quantitative pipe (16) and the degassing chamber (4); S1.4: open the first two-way valve (501), the third two-way valve (503), the fifth two-way valve (505), the sixth two-way valve (506), the first three-way valve (601) and the second three-way valve (602), and close other valves, the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; nitrogen gas passes through the fixed-point pressure stabilizing valve (8), and then passes through the third two-way valve (503), the degassing chamber (4) in sequence along one path; passes through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the sixth two-way valve (506) in sequence along another path to enter the degassing chamber (4), and then flows out from the first two-way valve (501), so that nitrogen gas cleans the degassing chamber (4); S1.5: open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the third three-way valve (603) and the vacuum pump (9), the opening time is 40-80 seconds, after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump (9) is closed; negative pressure is drawn through the vacuum pump (9), so that the gas in the pipeline enters the degassing chamber (4) through the quantitative oil drum (3), the second two-way valve (502), and the gas in the sixth two-way valve (506) enters the degassing chamber (4), and then passes through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601) and the third three-way valve (603) from the degassing chamber (4) in sequence and is discharged through the venting pipeline (15), so that the entire degassing chamber (4) reaches a vacuum environment; S1.6: open the third two-way valve (503), the fourth two-way valve (504) and the second three-way valve (602), the opening time is 2-10 seconds; after the set opening time is completed, the opened valves are automatically closed; after the nitrogen enters the fixed-point pressure stabilizing valve (8), one way passes through the third two-way valve (503), and the other way passes through the second three-way valve (602) and the fourth two-way valve (504) into the degassing chamber (4), so that the degassing chamber is filled with nitrogen; S1.7: open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504) and the second three-way valve (602), the opening time is 20-40 seconds; after the set opening time is completed, the opened valves are automatically closed; after the nitrogen enters the fixed-point pressure stabilizing valve (8), one way passes through the third two-way valve (503), and the other way passes through the second three-way valve (602) to the fourth two-way valve (504) into the degassing chamber (4) and is discharged from the first two-way valve (501), so as to positively wash the degassing chamber (4). S1.8: open the first two-way valve (501), the second two-way valve (502), the third two-way valve (503), the fifth two-way valve (505), the second three-way valve (602) and the seventh two-way valve (507), the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; nitrogen enters the fixed-point pressure stabilizing valve (8) and flows through the third two-way valve (503) into the degassing chamber (4), and flows through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the six-way switching valve (7), the seventh two-way valve (507), the quantitative oil barrel (3), the second two-way valve (502) into the degassing chamber (4) in sequence, so that the nitrogen flows out from the first two-way valve (501), and the nitrogen cleans the quantitative oil barrel (3) and the degassing chamber (4); S1.9: open the first two-way valve (501), the third two-way valve (503), the fifth two-way valve (505), the sixth two-way valve (506), the first three-way valve (601) and the second three-way valve (602), the opening time is 50-70 seconds; after the set opening time is completed, the opened valves are automatically closed; nitrogen flows into the degassing chamber (4) from the third two-way valve (503) in one way, and flows through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the sixth two-way valve (506) into the degassing chamber (4) in sequence in another way, and flows out from the first two-way valve (501), so that the nitrogen cleans the degassing chamber (4), and the circulation gas washing is completed twice.

9. The degassing method of a full-automatic degassing device for chromatographic analysis of insulating oil according to claim 7, characterized in that: The oil washing process comprises the following steps: S2: sequentially performing the oil washing process: S2.1: open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the third three-way valve (603) and the vacuum pump (9), and close the other valves, the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump (9) is closed; negative pressure is drawn by the vacuum pump (9) to make the gas in the pipeline flow from the quantitative oil barrel (3) through the second two-way valve (502), the degassing chamber (4), the sixth two-way valve (506), the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601) and the third three-way valve (603), and finally discharged through the venting pipeline (15), so that the entire degassing chamber (4) and the quantitative oil barrel (3) reach a vacuum environment; S2.2: open the eighth two-way valve (508), the opening time is 20-40 seconds, after the set opening time is completed, the opened valve is automatically closed; the oil inlet pipe (1) is used to feed oil, so that the oil enters the quantitative oil barrel (3) through the eighth two-way valve (508); S2.3: open the second two-way valve (502) for 50-70 seconds, and automatically close the opened valve after the set opening time is completed; the oil in the quantitative oil tank (3) enters the degassing chamber (4) through the second two-way valve (502), so as to realize oil transfer; S2.4: open the fourth two-way valve (504) and the second three-way valve (602) for 2-10 seconds, and automatically close the opened valve after the set opening time is completed; make the nitrogen enter the degassing chamber (4) through the second three-way valve (602) and the fourth two-way valve (504) in sequence, so as to realize oil and gas balance; S2.5: open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504) and the second three-way valve (602) for 80-100 seconds, and automatically close the opened valve after the set opening time is completed; make the nitrogen enter the degassing chamber (4) through the third two-way valve (503) in one way, and enter the degassing chamber (4) through the second three-way valve (602) and the fourth two-way valve (504) in another way, so as to make the oil be discharged from the oil outlet pipe (2) through the first two-way valve (501) and realize first oil washing of the degassing chamber (4); S2.6: open the first two-way valve (501), the second two-way valve (502), the third two-way valve (503), the fifth two-way valve (505), the second three-way valve (602) and the seventh two-way valve (507) for 20-40 seconds, and automatically close the opened valve after the set opening time is completed; make the nitrogen enter the degassing chamber (4) through the second three-way valve (602), the fifth two-way valve (505), the oil and gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the six-way switching valve (7), the seventh two-way valve (507), the quantitative oil tank (3) and the second two-way valve (502) in sequence in one way, and enter the degassing chamber (4) through the third two-way valve (503) in another way, and finally be discharged from the first two-way valve (501), so as to realize cleaning of the quantitative oil tank (3); S2.7: open the first two-way valve (501), the third two-way valve (503), the fifth two-way valve (505), the sixth two-way valve (506), the first three-way valve (601) and the second three-way valve (602) for 20-40 seconds, and automatically close the opened valve after the set opening time is completed; make the nitrogen enter the degassing chamber (4) through the third two-way valve (503) in one way, and enter the degassing chamber (4) through the second three-way valve (602), the fifth two-way valve (505), the oil and gas separator (10), the vacuum pump (9), the first three-way valve (601), the sixth two-way valve (506) in another way, and finally be discharged from the first two-way valve (501), so as to complete second cleaning of the degassing chamber (4); S2.8: open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the second three-way valve (602) and the third three-way valve (603), the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603) in turn from the vent line (15) on one route; on the other route, pass through the fourth two-way valve (504), the degassing chamber (4), the second two-way valve (502), the quantitative oil tank (3) from the second three-way valve (602) to the seventh two-way valve (507) in turn, complete the pressure holding detection of the whole gas circuit; S2.9: open the first two-way valve (501), the second two-way valve (502), the third two-way valve (503), the fifth two-way valve (505), the second three-way valve (602) and the seventh two-way valve (507), the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the second three-way valve (602), pass through the fifth two-way valve (505), pass through the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the six-way switch valve (7), the seventh two-way valve (507), the quantitative oil tank (3), the second two-way valve (502) into the degassing chamber (4) on one route, pass through the third two-way valve (503), the degassing chamber (4) on the other route, finally discharge from the first two-way valve (501), realize the secondary cleaning of the quantitative oil tank (3); S2.10: open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504), the sixth two-way valve (506) and the second three-way valve (602), the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the third two-way valve (503) into the degassing chamber (4) on one route, pass through the second three-way valve (602), the fourth two-way valve (504) into the degassing chamber (4) on the other route, flow into the sixth two-way valve (506), finally discharge from the first two-way valve (501), complete the third cleaning of the degassing chamber (4); at this time, the oil washing process is completed.

10. The degassing method of a full-automatic degassing device for insulating oil chromatographic analysis according to claim 7, characterized in that: The sample injection and degassing process comprises the following steps: S3: carry out the sample injection and degassing process in order: S3.1 open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the seventh two-way valve (507) and the third three-way valve (603), and open the vacuum pump (9), the opening time is 20-40 seconds, after the set opening time is completed, the opened valve is automatically closed, and the vacuum pump (9) is closed; the negative pressure is drawn by the vacuum pump (9) to make the gas in the pipeline pass through the degassing chamber (4) from the sixth two-way valve (506) one way, and pass through the sixth two-way valve (506) from the fourth three-way valve (604) another way, through the six-way switch valve (7), the seventh two-way valve (507), the quantitative oil barrel (3), the second two-way valve (502) in sequence, into the degassing chamber (4), then pass through the fourth two-way valve (504), the fifth two-way valve (505) from the degassing chamber (4), and discharge from the third three-way valve (603), so that the entire degassing chamber (4) and the quantitative oil barrel (3) reach a vacuum environment; S3.2: open the eighth two-way valve (508), the opening time is 20-40 seconds, after the set opening time is completed, the opened valve is automatically closed; the oil inlet pipe (1) is filled with oil, so that the oil enters the quantitative oil barrel (3) through the eighth two-way valve (508); S3.3: open the second two-way valve (502), the opening time is 50-70 seconds, after the set opening time is completed, the opened valve is automatically closed; the oil in the quantitative oil barrel (3) enters the degassing chamber (4) through the second two-way valve (502), realizing oil transfer; S3.4: open the second three-way valve (602), the opening time is 1-3 seconds, after the set opening time is completed, the opened valve is automatically closed; the nitrogen gas enters the pipeline connected with the valve passage through the second three-way valve (602), realizing pre-charging; S3.5: open the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506) and the first three-way valve (601), the opening time is 50-70 seconds, after the set opening time is completed, the opened valve is automatically closed; the dissolved gas in the oil and the pre-charged nitrogen gas in step S3.4 pass through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the sixth two-way valve (506) in sequence into the degassing chamber (4) to carry out the first small cycle degassing of the dissolved gas in the oil; S3.6: Switch the six-way switching valve (7) to the first interface and the sixth interface, the second interface and the third interface, the fourth interface and the fifth interface, open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506) and the seventh two-way valve (507), the opening time is 50~70 seconds, after the set opening time is completed, the opened valves are automatically closed, and the six-way switching valve (7) is switched to the initial state; the oil dissolved gas passes through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604) in sequence, enters the fifth interface and the fourth interface of the six-way switching valve (7), then enters the quantitative pipe (16), and then passes through the first interface and the sixth interface of the six-way switching valve (7), enters the quantitative oil tank (3) through the seventh two-way valve (507), and enters the degassing chamber (4) from the second two-way valve (502), to realize the first large circulation degassing of the oil dissolved gas; S3.7: Open the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the first three-way valve (601) and the vacuum pump (9), the opening time is 50~70 seconds, after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump (9) remains in the open state and is continuously used in the next step; the oil dissolved gas passes through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the sixth two-way valve (506) in sequence, and enters the degassing chamber (4) to perform the second small circulation degassing of the oil dissolved gas; S3.8, open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the seventh two-way valve (507) and the vacuum pump (9), the opening time is 50~70 seconds, after the set opening time is completed, the opened valves are automatically closed, and the vacuum pump (9) remains in the open state and is continuously used in the next step; the oil dissolved gas passes through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604) in sequence, enters the switching valve (7) after valve switching, enters the quantitative pipe (16), then passes through the seventh two-way valve (507) and enters the quantitative oil tank (3), and enters the degassing chamber (4) from the second two-way valve (502), to realize the second large circulation degassing of the oil dissolved gas; S3.9, switch the six-way switching valve (7) to connect the first port and the sixth port, the second port and the third port, and the fourth port and the fifth port, open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506) and the vacuum pump (9) for 80~110 seconds. After the set opening time is completed, automatically close the opened valves, close the vacuum pump (9), and switch the six-way switching valve (7) to the initial state; let the dissolved gas in the oil pass through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604) in sequence, enter the fifth port and the fourth port of the six-way switching valve (7), and then enter the metering tube (16) to achieve the pressure build-up of the metering tube (16); S3.10, all valves of the two-position two-way valve group (5) and the two-position three-way valve group (6), as well as the vacuum pump (9), are closed and left to stand for 2 to 10 seconds; so that the dissolved gas in the oil in the metering tube (16) reaches a balanced state; and the switch valve (12) is opened to complete the depressurization of the device; S3.11, open the six-way switching valve (7) to put the six-way switching valve (7) in the initial state. The opening time is 5 to 15 seconds. After the set opening time is completed, the opened valve is automatically closed. Through the switching of the six-way switching valve (7), the gas in the quantitative tube (16) enters the gas chromatograph for analysis. Then close all valves and the sample injection and degassing process is completed.

11. The degassing method of a full-automatic degassing device for insulating oil chromatographic analysis according to claim 7, characterized in that: The oil removal process includes the following steps: S4: Perform the oil draining process in sequence: S4.1, open the third two-way valve (503), the fourth two-way valve (504), and the second three-way valve (602) for 2 to 10 seconds. After the set opening time is completed, the opened valves are automatically closed. This allows nitrogen to enter the degassing chamber (4) through the third two-way valve (503) and through the second three-way valve (602) and the fourth two-way valve (504) in sequence, thus filling the degassing chamber with nitrogen. S4.2: Open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504), and the second three-way valve (602) for 50-70 seconds. After the set opening time is completed, the opened valves will be automatically closed. This allows nitrogen to enter the degassing chamber (4) through the third two-way valve (503) and enter the degassing chamber (4) through the second three-way valve (602) and the fourth two-way valve (504) in sequence, and then be discharged from the first two-way valve (501). The degassing chamber (4) is cleaned under positive pressure. S4.3: Switch the six-way switching valve (7) to connect the first port to the sixth port, the second port to the third port, and the fourth port to the fifth port. Open the first two-way valve (501), the second two-way valve (502), the third two-way valve (503), the fifth two-way valve (505), the second three-way valve (602), and the seventh two-way valve (507). The opening time is 20-40 seconds. After the set opening time is completed, automatically close the opened valves and switch the six-way switching valve (7) to the initial state. Let the nitrogen gas enter the degassing chamber (4) through the third two-way valve (503) in one path, and through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the six-way switching valve (7), the metering tube (16), and the seventh two-way valve (507) in the other path. After passing through the metering oil tank (3) and the second two-way valve (502), the nitrogen enters the degassing chamber (4), allowing nitrogen to flow out from the first two-way valve (501), thus achieving the first nitrogen cleaning of the metering tube (16) and the degassing chamber (4). S4.4, open the first two-way valve (501), the third two-way valve (503), the fifth two-way valve (505), the sixth two-way valve (506), the first three-way valve (601), and the second three-way valve (602) for 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed. Nitrogen gas enters the degassing chamber (4) through the third two-way valve (503) in one direction. Nitrogen gas enters the oil-gas separator (10) through the second three-way valve (602), the fifth two-way valve (505), the vacuum pump (9), the first three-way valve (601), and the sixth two-way valve (506) in the other direction. Nitrogen gas entering the degassing chamber (4) flows out from the first two-way valve (501), thus cleaning the degassing chamber (4) for the first time. S4.5: Open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the seventh two-way valve (507), the third three-way valve (603), and the vacuum pump (9) to evacuate the gas. The opening time is 110~130 seconds. After the set opening time is completed, the opened valves will be automatically closed. The gas in the pipeline will flow from the fourth three-way valve (604) through the seventh two-way valve (507), the metering oil tank (3), the second two-way valve (502), the degassing chamber (4), the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), and into the third three-way valve (603). The gas will be vented through the venting pipeline (15) to achieve the first vacuuming of the degassing chamber (4) and the entire gas path. S4.6: Open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504), and the second three-way valve (602) for 50-70 seconds. After the set opening time is completed, the opened valves will be automatically closed. Nitrogen gas will pass through the third two-way valve (503) and enter the degassing chamber (4) in one direction, and pass through the second three-way valve (602) and the fourth two-way valve (504) in the other direction to enter the degassing chamber (4). Oil will be discharged from the degassing chamber (4) through the first two-way valve (501) and out of the oil outlet pipe (2), so that the degassing chamber (4) will be cleaned for the first time. S4.7: Open the second two-way valve (502), the fourth two-way valve (504), the fifth two-way valve (505), the sixth two-way valve (506), the seventh two-way valve (507), the third three-way valve (603), and the vacuum pump (9). The opening time is 50-70 seconds. After the set opening time is completed, the opened valves will automatically close. The gas in the pipeline will enter the degassing chamber (4) sequentially from the fourth three-way valve (604), through the six-way switching valve (7), the seventh two-way valve (507), the metering oil tank (3), and the second two-way valve (502). The gas in the sixth two-way valve (506) will also enter the degassing chamber (4). Then the gas in the degassing chamber (4) passes through the fourth two-way valve (504), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), and enters the third three-way valve (603). It is then vented through the venting pipeline (15) to achieve a second vacuuming of the degassing chamber (4) and the entire gas path. S4.8: Open the third two-way valve (503), the fourth two-way valve (504), and the second three-way valve (602) for 2 to 10 seconds. After the set opening time is completed, the opened valves will be automatically closed. This allows nitrogen to enter the degassing chamber (4) through the third two-way valve (503) and through the second three-way valve (602) and the fourth two-way valve (504) in sequence, thus filling the degassing chamber with nitrogen. S4.9: Open the first two-way valve (501), the third two-way valve (503), the fourth two-way valve (504), and the second three-way valve (602) for 20-40 seconds. After the set opening time is completed, the opened valves are automatically closed; allowing nitrogen to enter the degassing chamber (4) through the third two-way valve (503), the second three-way valve (602), and the fourth two-way valve (504), and be discharged from the first two-way valve (501), thus cleaning the degassing chamber (4) under positive pressure. S4.10: Switch the six-way switch valve (7) to the first interface in communication with the sixth interface, the second interface in communication with the third interface, the fourth interface in communication with the fifth interface, open the first two-way valve (501), the second two-way valve (502), the third two-way valve (503), the fifth two-way valve (505), the second three-way valve (602) and the seventh two-way valve (507), the opening time is 20-40 seconds, after the set opening time is completed, the opened valves are automatically closed, and the six-way switch valve (7) is switched to the initial state; make the nitrogen pass through the third two-way valve (503), the degassing chamber (4) in one way, and pass through the second three-way valve (602), the fifth two-way valve (505), the oil-gas separator (10), the vacuum pump (9), the first three-way valve (601), the third three-way valve (603), the fourth three-way valve (604), the six-way switch valve (7), the quantitative pipe (16), the seventh two-way valve (507), the quantitative oil bucket (3), the second two-way valve (502) in another way, enter the degassing chamber (4), so that the nitrogen flows out from the first two-way valve (501), realize the second cleaning of the quantitative pipe (16) and the degassing chamber (4) by nitrogen; S4.11: Open the first two-way valve (501), the third two-way valve (503), the fifth two-way valve (505), the sixth two-way valve (506), the first three-way valve (601) and the second three-way valve (602), the opening time is 50-70 seconds, after the set opening time is completed, the opened valves are automatically closed; make the nitrogen pass through the third two-way valve (503) into the degassing chamber (4) in one way, and pass through the second three-way valve (602), the fifth two-way valve (505) into the oil-gas separator (10), the vacuum pump (9), through the first three-way valve (601), the sixth two-way valve (506) into the degassing chamber (4) in another way, and flow out from the first two-way valve (501), so that the nitrogen cleans the degassing chamber (4) for the second time; at this time, the oil discharge process is completed.

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