CN114336386B - Method for quickly discharging waste gas of gas switch - Google Patents
Method for quickly discharging waste gas of gas switch Download PDFInfo
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Abstract
The invention relates to a gas switch, in particular to a gas switch waste gas rapid discharge method, which solves the technical problems that the gas switch waste gas discharge method in the existing large-scale pulse power device has long discharge time, high gas consumption, easy pipeline fatigue damage or difficult realization of complete discharge of waste gas, long discharge time and high gas consumption, and further the maintenance frequency of the large-scale pulse power device is increased; firstly, a gas switch waste gas rapid discharge system is built, an air inlet of a gas switch is connected with an air source through an air charging pipeline, and the air charging pipeline is sequentially provided with an air charging valve and an air charging pressure gauge along the air flow direction; the exhaust port of the gas switch is communicated with the outside through an exhaust pipeline, and the exhaust pipeline is sequentially provided with an exhaust pressure gauge and an exhaust valve along the gas flow direction; an exhaust gas monitoring unit is arranged on the exhaust pipe, so that the rapid and full discharge of high-voltage discharge products of the gas switch is realized, the service life of the gas switch is prolonged, and the good working requirement of a large pulse power device is met.
Description
Technical Field
The invention relates to a gas switch, in particular to a method for quickly discharging waste gas of the gas switch.
Background
With the rapid development of pulse power technology in recent years, gas switches are widely used in large-scale pulse power devices, and the working stability, high-voltage insulation resistance and switch life of the gas switches directly determine the running state and fault rate of the large-scale pulse power devices, so that the gas switches become important contents of the research of the large-scale pulse power devices.
The gas switch works in high voltage (hundred kilovolts), high gas pressure (tens of bars) and high current (hundred kA) environments, and two types of products are generated in the breakdown discharge process: the high-temperature arc plasma generates unavoidable ablation on electrode materials, so that the electrodes are melted, splashed and gasified to form gaseous metal or metal oxide, and the gaseous metal or metal oxide is suspended in a gas switch cavity; the other type is that under the extreme working condition of high-voltage and strong-current discharge, the insulating gas in the gas switch generates complex chemical reaction to generate a large amount of nitrogen oxides or fluorides, and the like, and has strong oxidability and corrosiveness. The two products can cause the problems of reduced insulating property, material aging failure, reduced pressure resistance of a gas pipeline and the like of the gas switch, thereby causing the gas switch to have reduced performance or gas leakage and oil leakage faults. Thus, after each switching high voltage discharge, gaseous products (i.e. exhaust gases) should be discharged as soon as possible.
The existing gas switch exhaust emission methods are divided into a high-pressure ventilation method and a purging method. The high-pressure ventilation method is to start exhausting after breakdown of the gas switch, re-charge the gas switch to working pressure after the internal pressure of the gas switch is reduced to external pressure, and re-exhaust the gas, and complete the exhausting of the gas switch after the gas switch is circulated for 2-3 times according to the method. The method has the defects of long exhaust time, large high/low pressure difference and easy pipeline fatigue damage. The purging method refers to direct purging by compressed air after the gas switch is exhausted. Because the gas switch cavity has a complex structure, the distance between the gas charging and discharging ports is relatively short, the efficiency of the sweeping gas flow for taking out the waste gas is relatively low, the waste gas is difficult to completely discharge, and the defects of long exhaust time and large gas consumption are caused.
In summary, in the conventional large pulse power device, if the exhaust gas generated by the high-voltage discharge of the gas switch cannot be discharged quickly in time, the problems of the reduced insulation performance of the gas switch, the aged and invalid material, the reduced pressure resistance of the gas pipeline and the like are easily caused, so that the performance of the gas switch is reduced or the gas leakage and oil leakage faults occur. The existing gas switch exhaust emission method has the defects of long exhaust time, high gas consumption, easy pipeline fatigue damage, difficult realization of complete exhaust of exhaust, long exhaust time and high gas consumption, and further increased maintenance frequency of a large pulse power device.
Disclosure of Invention
The invention aims to solve the technical problems that the exhaust gas emission method of the gas switch in the existing large pulse power device is long in exhaust time, high in gas consumption and easy to cause fatigue damage of a pipeline or difficult to realize complete exhaust of exhaust gas, and the exhaust time is long, the gas consumption is high, and further the maintenance frequency of the large pulse power device is increased.
In order to solve the technical problems, the invention adopts the following technical scheme:
the quick exhaust method for the gas switch is characterized by comprising the following steps of:
1.1, connecting an air inlet of the air switch with an air source through an air charging pipeline, wherein the air charging pipeline is sequentially provided with an air charging valve and an air charging pressure gauge along the air charging air flow direction;
1.2, the exhaust port of the gas switch is communicated with the outside through an exhaust pipeline, and the exhaust pipeline is sequentially provided with an exhaust pressure gauge and an exhaust valve along the exhaust gas flow direction; an exhaust gas monitoring unit is arranged on the exhaust pipe;
2.1 according to the atmospheric pressure P a Calculating the exhaust gas lower limit pressure P l ，P l ＝AP a Wherein A is the lower limit pressure coefficient of exhaust, and the value range is 1.7-2.1;
2.2 according to the air pressure P of the air source s Calculating the upper limit pressure P of inflation h ,P h ＝BP s Wherein B is an inflation upper limit pressure coefficient, and the value range is 1.7-2.1;
2.3 calculating a time constant tau;
wherein: v is the total volume of the gas switch, k is the gas insulation coefficient of the gas source, the value range is 1.3-1.4, S is the effective sectional area of the charging pipeline, T s Is the gas temperature of the gas source;
4.1 opening the exhaust valve to start exhausting all the discharged gas switches, observing the pressure P in the gas switches by the inflation pressure gauge, when P=P l Closing the exhaust valve and stopping exhausting;
4.2 calculating the first exhaust time T of the gas switch 0 ；
Wherein: p (P) w Working air pressure for the air switch;
4.3 calculating the relative concentration C of the exhaust gas in the gas switch cavity 0 ；
After the gas switch discharges, the waste gas content Q in the cavity thereof 0 ＝P w V, the gas switch firstly exhausts, and the pressure drop in the cavity is P l Waste gas content Q 1 ＝P l V relative concentration
4.4 opening the charging valve, starting charging the air source, observing the internal pressure of the air switch by the exhaust pressure gaugeStrong P, when p=p h When the air charging valve is closed, the air charging is stopped;
4.5 calculating the gas switch inflation time T c ；
4.6 opening the exhaust valve again to start exhausting all the gas switches, observing the pressure P in the gas switches through the inflation pressure gauge, when P=P l Closing the exhaust valve and stopping exhausting;
4.7 calculating the gas switch exhaust time T p ；
4.8 calculating the time t taken from inflation to deflation once;
t＝T c +T p
4.9 calculating the total time consumption T for the first exhaust and the complete n charges to exhaust n ；
T n ＝T 0 +n*t
Wherein: n is the number of times from the completion of inflation to the exhaustion, and n is more than or equal to 1;
4.10 calculating the relative concentration C of exhaust gas in the gas switch cavity n ；
According to the design technical index requirement of the gas switch of the large pulse power device, after the gas switch is observed to exhaust by the exhaust gas monitoring unit, the relative concentration of the exhaust gas in the cavity is smaller than the designated concentration C d ；
If the relative concentration of the waste gas in the gas switch cavity meets C n <C d When in use, the inflation valve is directly closed, and the process is completedForming gas switch for ventilation, recording the number of times n of gas switch inflation to gas discharge, and the relative concentration C of waste gas in the gas switch cavity 0 And C n And total time consumption T for first to n times of complete charge to exhaust n ；
If the relative concentration of the waste gas in the gas switch cavity meets C n ≥C d And (4) returning to the step (4.4) until the relative concentration of the waste gas in the gas switch cavity meets C n <C d When the gas switch ventilation is completed, the number of times n of gas switch inflation to gas exhaustion and the relative concentration C of the waste gas in the gas switch cavity are recorded 0 And C n And total time consumption T for first to n complete charges to exhaust n 。
Further, in the step 2, the lower limit pressure coefficient a of the exhaust gas is 1.893, the upper limit pressure coefficient B of the inflation gas is 0.528, and the adiabatic coefficient k of the gas source gas is 1.4.
Further, the exhaust gas monitoring unit is arranged in front of the exhaust pressure gauge or/and behind the exhaust valve.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the invention provides a method for rapidly discharging waste gas of a gas switch, which has the advantages of rapid discharging speed and high efficiency of the waste gas inside the gas switch, can accurately measure whether the gas pressure and the waste gas discharge inside the gas switch are sufficient in the stage of charging and discharging, and provides a technical scheme for reliably connecting a large number of gas switches in a large pulse power device and measuring the internal gas pressure of the gas switch.
2. The invention provides a method for rapidly discharging waste gas of a gas switch, which can effectively reduce the number and the length of gas charging and discharging pipelines of the gas switch, has great significance in improving the service life of the gas switch, keeping the good working state of the switch and prolonging the service life of the gas pipeline, and can be widely applied to various large-scale pulse power devices.
Drawings
FIG. 1 is a schematic diagram of a gas switch exhaust gas rapid discharge device according to the present invention;
FIG. 2 is a schematic diagram showing the relationship between the pressure in the gas switch cavity and time during the inflation in the method for rapidly discharging the exhaust gas of the gas switch according to the present invention;
FIG. 3 is a schematic diagram showing the relationship between the pressure in the gas switch cavity and time during the exhaust in the method for rapidly exhausting the exhaust gas of the gas switch according to the present invention;
FIG. 4 is a schematic diagram showing the relationship between the pressure in the gas switch cavity and time during ventilation in a method for rapidly discharging exhaust gas of a gas switch according to the present invention;
the reference numerals in the drawings are:
the device comprises a 1-exhaust pipeline, a 2-charging pipeline, a 3-charging pressure gauge, a 4-gas source, a 5-charging valve, a 6-exhaust valve, a 7-exhaust pressure gauge, an 8-gas switch and a 9-exhaust gas monitoring unit.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the term "disposed" should be interpreted broadly, and for example, it may be fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
A gas switch exhaust gas rapid discharge method comprises the following steps:
1.1, an air inlet of the air switch 8 is connected with an air source 4 through an air charging pipeline 2, and the air charging pipeline 2 is sequentially provided with an air charging valve 5 and an air charging pressure gauge 3 along the air charging air flow direction;
1.2, the exhaust port of the gas switch 8 is communicated with the outside through an exhaust pipeline 1, and the exhaust pipeline 1 is sequentially provided with an exhaust pressure gauge 7 and an exhaust valve 6 along the exhaust gas flow direction; an exhaust gas monitoring unit 9 is arranged on the exhaust pipeline 1;
2.1 according to the atmospheric pressure P a Calculating the exhaust gas lower limit pressure P l ，P l ＝AP a Wherein A is the lower limit pressure coefficient of exhaust, and the value is 1.893;
2.2 according to air pressure P of air source 4 s Calculating the upper limit pressure P of inflation h ,P h ＝BP s Wherein B is an inflation upper limit pressure coefficient, and the value is 0.528;
2.3 calculating a time constant tau;
wherein: v is the total volume of the gas switch, k is the gas insulation coefficient of the gas source, the value is 1.4, S is the effective sectional area of the charging pipeline, T s Is the gas temperature of the gas source;
4.1 opening the exhaust valve 6 to start the exhaust of all the gas switches 8 after discharge, observing the pressure P in the gas switch 8 by the inflation pressure gauge 3, when p=p l Closing the exhaust valve 6 to stop exhausting;
4.2 calculating the first exhaust time T of the gas switch 0 ；
Wherein: p (P) w Working air pressure for the air switch;
4.3 calculating the relative concentration C of exhaust gas in the cavity of the gas switch 8 0 ；
After the gas switch 8 discharges, the exhaust gas content Q in the cavity thereof 0 ＝P w V, the gas switch 8 exhausts for the first time, and the pressure drop in the cavity is P l Waste gas content Q 1 ＝P l V relative concentration
4.4 opening the charging valve 5, the gas source 4 starts to charge, the pressure P in the gas switch 8 is observed by the exhaust pressure gauge 7, when p=p h When the air charging valve 5 is closed, the air charging is stopped;
4.5 calculating the gas switch 8 inflation time T c ；
4.6 reopening the vent valve 6 to start venting all gas switches 8, observing the pressure P in the gas switch 8 through the inflation pressure gauge 3 when p=p l Closing the exhaust valve 6 to stop exhausting;
4.7 calculating the exhaust time T of the gas switch 8 p ；
4.8 calculating the pressure P in the primary gas switch 8 from P l Inflated to P h From P h Exhaust to P l Time t used in this process;
t＝T c +T p
4.9 calculating the total time consumption T for the first exhaust and the complete n charges to exhaust n ；
T n ＝T 0 +n*t
Wherein: n is the number of times from the completion of inflation to the exhaustion, and n is more than or equal to 1;
4.10 calculating the relative concentration C of exhaust gas in the cavity of the gas switch 8 n ；
According to the design technical index requirement of the gas switch 8 of the large pulse power device, after the gas switch 8 is observed to exhaust through the exhaust gas monitoring unit 9, the relative concentration of the exhaust gas in the cavity should be smaller than the designated concentration C d ；
If the relative concentration of the waste gas in the cavity of the gas switch 8 meets C n <C d When the gas switch 8 is in the gas discharge state, the gas charging valve 5 is directly closed to complete the gas exchange of the gas switch 8, the gas charging time n of the gas switch 8 is recorded, and the relative concentration C of the waste gas in the cavity of the gas switch 8 is recorded 0 And C n And total time consumption T for first to n times of complete charge to exhaust n ；
If the relative concentration of the waste gas in the cavity of the gas switch 8 meets C n ≥C d And returning to the step 4.4 until the relative concentration of the waste gas in the cavity of the gas switch 8 meets C n <C d When the ventilation of the gas switch 8 is completed, the number n of times of the gas switch 8 to be inflated to be exhausted is recorded, and the relative concentration C of the exhaust gas in the cavity of the gas switch 8 is recorded 0 And C n And total time consumption T for first to n complete charges to exhaust n 。
When the exhaust is carried out, when P is more than or equal to P l The speed of exhaust is sound speed, and the exhaust speed is high; p < P l The exhaust speed is subsonic, and becomes slow; when inflated, P is less than or equal to P h The speed of inflation is sound speed, and the inflation speed is high; p > P h The inflation speed is subsonic, and the inflation speed is reduced; the exhaust and charge control of the gas switch 8 is performed in the sonic region.
In order to better explain the technical scheme of the invention, the embodiment sets a gas switch exhaust gas rapid discharging device in a Marx generator, and the specific setting is as follows: grouping the gas switches 8, namely grouping 8 gas switches of the same Marx generator into a group, wherein one group of gas switches comprises 8 gas inlets which are connected to the gas charging pipeline 2 in parallel, the gas inlets of the gas switches 8 are connected with the gas source 4 through the gas charging pipeline 2, and the gas charging pipeline 2 is sequentially provided with the gas charging valve 5 and the gas charging pressure gauge 3 along the gas charging flow direction; the exhaust gas flow control method comprises the following steps that 8 exhaust ports of the same group of gas switches are connected to an exhaust pipeline 1 in parallel, the exhaust ports of the gas switches 8 are communicated with the outside through the exhaust pipeline 1, and an exhaust pressure gauge 7 and an exhaust valve 6 are sequentially arranged in the exhaust pipeline 1 along the exhaust gas flow direction; an exhaust gas monitoring unit 9 is arranged on the exhaust pipeline 1;
according to the gas switch exhaust gas rapid discharge method, the gas switch 8 exhaust gas rapid discharge operation in the Marx generator is as follows:
the total volume of the gas switch 8 is v=1m 3 Air pressure P of air source 4 s ＝1MP a Working air pressure P of air switch 8 w ＝1MP a Atmospheric pressure P a ＝0.1MP a The effective sectional area of the charging pipeline 2 is S=0.00002 m 2 Gas source 4 gas temperature T s 298K, gas source 4 gas insulation coefficient k=1.4;
according to the above parameters, the calculation results are:
P h ＝0.528×P s ＝0.528MP a ；
P l ＝1.839×P a ＝0.184MP a ；
and calculating to obtain a time constant tau= 89.21s;
the first exhaust operation after the discharge of the gas switch 8, the working pressure P from the gas switch 8 w Exhaust to pressure in cavity drop to P l Time T for exhausting 0 ＝167.63s；
The relative concentration of the waste gas in the cavity of the gas switch 8 is C 0 ＝18.9％；
The inflation valve 5 is opened for the first time, the air source 4 starts to inflate, the pressure P in the air switch 8 is observed by the exhaust pressure gauge 7, when p=p h When the air charging valve 5 is closed, the air charging is stopped;
calculate the time t for inflation c1 ＝30.22s；
The exhaust valve 6 is opened again, all the gas switches 8 are started to exhaust, the pressure P of the gas switches 8 is observed through the inflation pressure gauge 3, and when p=p l Closing the exhaust valve 6 to stop exhausting;
calculate the exhaust time t p1 ＝98.51s；
Time t=t taken from charge to exhaust for the first operation c1 +t p1 ＝30.22+98.51＝128.73s；
Total time spent after the first operation: t (T) 1 ＝T 0 +1*t＝167.63+128.73＝296.36s；
Relative concentration of exhaust gas in the cavity of the gas switch 8 after the first operation
Repeating the first operation for the second operation;
calculate the time t for inflation c2 ＝30.22s；
Calculate the exhaust time t p2 ＝98.51s；
Time t=t taken from charge to exhaust for the second operation c2 +t p2 ＝30.22+98.51＝128.73s；
Total time spent after the second operation: t (T) 2 ＝T 0 +2*t＝167.63+257.46＝425.09s；
The relative concentration of the exhaust gas in the cavity of the gas switch 8 after the second operation is as follows:
repeating the first operation for the third operation;
calculate the time t for inflation c3 ＝30.22s；
Calculate the exhaust time t p3 ＝98.51s；
Time t=t taken from charge to exhaust for the third operation c3 +t p3 ＝30.22+98.51＝128.73s；
Total time spent after the third operation: t (T) 3 ＝T 0 +3*t＝167.63+386.19＝553.82s；
The relative concentration of the waste gas in the cavity of the gas switch 8 after the third operation is as follows:
repeating the first operation for a fourth time;
calculate the time t for inflation c4 ＝30.22s；
Calculate the exhaust time t p4 ＝98.51s；
Time t=t taken from charge to exhaust for the fourth operation c4 +t p4 ＝30.22+98.51＝128.73s；
Total time spent after the fourth run: t (T) 4 ＝T 0 +4*t＝167.63+514.92＝682.65s；
After the fourth operation, the relative concentration of the exhaust gas in the cavity of the gas switch 8 is as follows:
when the high-pressure ventilation method is used, the air pressure in the cavity of the air switch 8 is controlled from P s =1 Mpa down to P a ＝0.1MpaP a ；
This time is time consuming: t is t 1 ＝t p1 ＝284.79s；
Relative concentration of exhaust gas in the gas switch 8 chamber: c (C) 1 ＝10％；
The gas switch 8 is inflated again to 1Mpa, when in use: t is t c2 ＝146.45s；
The gas switch 8 is exhausted to P for the first time a When in use: t is t p2 ＝284.79s；
This time is time consuming: t is t 2 ＝t c2 +t p2 ＝146.45+284.79＝431.24s；
Total time consuming: t (T) 2 ＝t 1 +t 2 ＝284.79+431.24＝716.03s；
Relative concentration of exhaust gas in the gas switch 8 chamber: c (C) 1 ＝1％。
The residual concentration of the exhaust gas in the cavity of the gas switch 8 for exhaust gas charging calculated by the two methods is shown in table 1:
TABLE 1 exhaust time and residual exhaust gas relative concentration
The invention relates to a method for rapidly discharging waste gas of a gas switch, which is used for 682.65s when the relative concentration of the waste gas in a cavity of the gas switch 8 is less than or equal to 0.31 percent; the high-pressure ventilation method is adopted, and when the relative concentration of waste gas in the cavity of the gas switch 8 is less than or equal to 1%, the service time is 716.03s; compared with the two methods, the method for quickly discharging the exhaust gas of the gas switch has the advantages that the relative concentration of the exhaust gas in the gas switch 8 is reduced by more than 69%, and the exhaust time and the relative concentration of the residual exhaust gas are recorded as above by different methods in the gas switch 8.
Claims (3)
1. The quick exhaust method for the gas switch is characterized by comprising the following steps of:
step 1, a gas switch (8) exhaust gas rapid discharge system is built
1.1, an air inlet of the air switch (8) is connected with an air source (4) through an air charging pipeline (2), and the air charging pipeline (2) is sequentially provided with an air charging valve (5) and an air charging pressure gauge (3) along the air charging flow direction;
1.2, the exhaust port of the gas switch (8) is communicated with the outside through an exhaust pipeline (1), and the exhaust pipeline (1) is sequentially provided with an exhaust pressure gauge (7) and an exhaust valve (6) along the exhaust gas flow direction; an exhaust gas monitoring unit (9) is arranged on the exhaust pipeline (1);
step 2 calculating the exhaust gas lower limit pressure P l Upper limit pressure P of inflation h And a time constant tau
2.1 according to the atmospheric pressure P a Calculating the exhaust gas lower limit pressure P l ，P l ＝AP a Wherein A is the lower limit pressure coefficient of exhaust, and the value range is 1.7-2.1;
2.2 according to the air pressure P of the air source (4) s Calculating the upper limit pressure P of inflation h ,P h ＝BP s Wherein B is an inflation upper limit pressure coefficient, and the value range is 0.3-0.7;
2.3 calculating a time constant tau;
wherein: v is the total volume of the gas switch, k is the gas insulation coefficient of the gas source, the value range is 1.3-1.4, S is the effective sectional area of the charging pipeline, T s Is the gas temperature of the gas source;
step 3, a gas switch (8) performs discharging operation;
step 4 gas switch (8) exhaust
4.1 opening the exhaust valve (6) to start exhausting all the discharged gas switches (8), observing the pressure P in the gas switches (8) through the inflation pressure gauge (3), when P=P l Closing the exhaust valve (6) and stopping exhausting;
4.2 calculating the first exhaust time T of the gas switch (8) 0 ；
Wherein: p (P) w Working air pressure for the air switch;
4.3 calculating the relative concentration C of the exhaust gas in the cavity of the gas switch (8) 0 ；
After the gas switch (8) discharges, the waste gas content Q in the cavity thereof 0 ＝P w V, the gas switch (8) exhausts for the first time, and the air pressure drop in the cavity is P l Waste gas content Q 1 ＝P l V relative concentration
4.4 opening the charging valve (5), the gas source (4) starts charging, and the pressure in the gas switch (8) is observed through the exhaust pressure gauge (7)P, when p=p h When the air charging valve (5) is closed, the air charging is stopped;
4.5 calculating the gas switch (8) charging time T c ；
4.6 reopening the vent valve (6) to start venting all the gas switches (8), observing the pressure P in the gas switch (8) through the inflation pressure gauge (3), when p=p l Closing the exhaust valve (6) and stopping exhausting;
4.7 calculating the exhaust time T of the gas switch (8) p ；
4.8 calculating the time t taken from inflation to deflation once;
t＝T c +T p
4.9 calculating the total time consumption T for the first exhaust and the complete n charges to exhaust n ；
T n ＝T 0 +n*t
Wherein: n is the number of times from the completion of inflation to the exhaustion, and n is more than or equal to 1;
4.10 calculating the relative concentration C of the waste gas in the cavity of the gas switch (8) n ；
Step 5, judging the relative concentration C of the waste gas in the cavity of the gas switch (8) n Whether or not to meet the requirements
According to the design technical index requirement of a gas switch (8) of a large pulse power device, after the gas switch (8) is observed to exhaust through an exhaust gas monitoring unit (9), the relative concentration of the exhaust gas in a cavity is smaller than the designated concentration C d ；
If the relative concentration of the waste gas in the cavity of the gas switch (8) meets C n ＜C d When the gas switch (8) is inflated, the inflation valve (5) is directly closed to complete the ventilation of the gas switch (8), the number of times of inflation and deflation of the gas switch (8) is recorded, and the relative concentration C of the exhaust gas in the cavity of the gas switch (8) is recorded 0 And C n And total time consumption T for first to n times of complete charge to exhaust n ；
If the relative concentration of the waste gas in the cavity of the gas switch (8) meets C n ≥C d And returning to the step 4.4 until the relative concentration of the waste gas in the cavity of the gas switch (8) meets the requirement of C n ＜C d When the ventilation of the gas switch (8) is completed, the number of times n of the gas switch (8) to be inflated and exhausted is recorded, and the relative concentration C of the exhaust gas in the cavity of the gas switch (8) is recorded 0 And C n And total time consumption T for first to n complete charges to exhaust n 。
2. The method for rapidly discharging exhaust gas of a gas switch according to claim 1, wherein: in the step 2, the lower limit pressure coefficient a of the exhaust gas is 1.893, the upper limit pressure coefficient B of the inflation gas is 0.528, and the adiabatic coefficient k of the gas source gas is 1.4.
3. A gas switching exhaust gas rapid discharge method according to claim 1 or 2, characterized in that: the exhaust gas monitoring unit (9) is arranged in front of the exhaust pressure gauge (7) or/and behind the exhaust valve (6).
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