阅读说明：本技术 隔爆测试系统及测试方法 (Flame-proof test system and test method ) 是由 石磊 赵宏 金兆辉 于 2020-12-30 设计创作，主要内容包括：本发明涉及一种隔爆测试系统及测试方法,系统包括5个隔爆试验罐,5个隔爆试验罐容积从小到大,系统分为3个独立的测试子系统,3个测试子系统可同时进行测试,第一个测试子系统中仅有一个容积最小隔爆试验罐,另两个测试子系统均包括并联的两个隔爆试验罐。每个测试子系统每次测试使用同一种可燃气混合气,3个测试子系统可使用3种相同或3种不同的可燃气混合气同时进行测试。通过系统设计,可完成多个试样同时配气同时测试,提高系统利用率和测试效率；配气过程中不需对管道中气体进行置换,缩短配气时间；流量调节结合含氧测试保证配气精度。(The invention relates to an explosion-proof test system and a test method, wherein the system comprises 5 explosion-proof test tanks, the volume of the 5 explosion-proof test tanks is from small to large, the system is divided into 3 independent test subsystems, the 3 test subsystems can carry out test simultaneously, only one explosion-proof test tank with the smallest volume is arranged in the first test subsystem, and the other two test subsystems respectively comprise two explosion-proof test tanks which are connected in parallel. Each test subsystem uses the same combustible gas mixture for each test, and 3 test subsystems can simultaneously test by using 3 same or 3 different combustible gas mixtures. Through system design, simultaneous testing of gas distribution of a plurality of samples can be completed, and the system utilization rate and the testing efficiency are improved; gas in the pipeline does not need to be replaced in the gas distribution process, so that the gas distribution time is shortened; the flow regulation is combined with the oxygen-containing test to ensure the gas distribution precision.)

1. A flame-proof test system is characterized by comprising 5 flame-proof test tanks, wherein the volumes of the 5 flame-proof test tanks are from small to large, the system is divided into 3 independent test subsystems, only one flame-proof test tank with the smallest volume is arranged in the first test subsystem, and the other two test subsystems comprise two flame-proof test tanks which are connected in parallel;

each testing subsystem comprises three groups of adjusting and detecting gas circuits, a group of gas mixing gas circuits, a tank body input adjusting valve group, an explosion-proof testing tank, a tank body output adjusting valve group, a group of pressure adjusting gas circuits, a group of gas analyzing pipelines, a tank body controller, an ignition pressure measuring device, a high-speed camera and a plurality of temperature and pressure sensors; the three independent testing subsystems share one vacuum pump and various gas tanks for containing gas, methane, propane, ethylene and acetylene are used as a first group of gas tanks, hydrogen and nitrogen are used as a second group of gas tanks, oxygen and compressed air are used as a third group of gas tanks, the output end of each gas tank is connected with a manual valve, each gas tank of gas corresponds to a unique gas pipeline, the front ends of the hydrogen in the first group of gas tanks and the second group of gas tanks, which enters a first group of adjusting and detecting gas circuits, are respectively connected with a controllable conduction valve, the front ends of the second group of gas tanks, which enters the second group of adjusting and detecting gas circuits, are respectively connected with a controllable conduction valve, and the third group of gas tanks directly enters a third group of adjusting and detecting gas circuits; the output ends of the three groups of adjusting and detecting gas paths are connected with each explosion-proof test tank through a tank input adjusting valve group and a tank output adjusting valve group;

the two sides of each flameproof test tank are symmetrically provided with a plurality of groups of flameproof test tank inlet and outlet pipelines consisting of tank body input regulating valve groups, tank body output regulating valve groups and ventilation pipelines, and the inlet and outlet pipelines of each flameproof test tank are respectively connected with an exhaust port through a corresponding pressure regulating gas circuit, a corresponding gas analysis pipeline and a vacuum pump;

the pressure that the pressure sensor on regulation detection gas circuit, three gas mixture gas circuits of group and every flame proof test jar output pipeline detected, the temperature that the temperature sensor in every flame proof test jar detected, the oxygen content data that every group gas analysis pipeline detected, flame propagation state data send corresponding tank control ware when the explosion of shooting through the observation window at a high speed, tank control ware output control signal is to the conduction valve, the governing valve, ignition pressure measurement device, realizes the test.

2. The flameproof test system according to claim 1, wherein the adjustment detection gas circuits corresponding to methane, propane, ethylene, acetylene, hydrogen, nitrogen and oxygen are the same and each comprises a first flame arrester, a manual valve, a filter, a pressure reducing valve, a pressure sensor, a conduction valve, a gas flowmeter, a second flame arrester and a one-way valve in sequence; the oxygen and the compressed air are used as non-combustible gas distribution gas, a regulation detection gas path of the oxygen and the compressed air is partially shared, the compressed air firstly passes through an oil mist separator after entering the regulation detection gas path, is output through a manual valve after being ensured to be dry by a cold dryer, and then sequentially enters a compressed air filter, a compressed air pressure reducing valve, a compressed air pressure sensor, a compressed air conduction valve, a non-combustible gas distribution gas flowmeter, a non-combustible gas distribution gas flame arrester and a non-combustible gas distribution gas one-way valve to enter a gas mixing gas path, and the oxygen and the compressed air partially share the non-combustible gas distribution gas flowmeter, the non-combustible gas distribution flame arrester and the non-combustible gas distribution one-way valve.

3. The flameproof test system according to claim 1 or 2, wherein the gas mixing gas circuit comprises a static gas mixing device, a mixing container, a third flame arrester, a gas mixing gas circuit pressure sensor and a regulating valve in sequence; the tail end of the gas mixing gas circuit is divided into three paths by a regulating valve, one path of the gas mixing gas circuit is introduced into a tank body input regulating valve group and a tank body output regulating valve group of the tank body controller, the other path of the gas mixing gas circuit is connected with an exhaust port through a pressure regulating gas circuit, and the other path of the gas mixing gas circuit is connected with an exhaust port through a gas analysis pipeline;

the pressure regulating valve is connected with one regulating valve in series and then connected with the other regulating valve in parallel to form a pressure regulating gas circuit; the regulating valve is connected in series with a gas analyzer to form a gas analysis pipeline.

4. The flameproof test system of claim 3, wherein the pressure regulating valve is connected in series with one regulating valve and then connected in parallel with another regulating valve to form a pressure regulating gas circuit; a regulating valve is connected in series with a gas analyzer to form a gas analysis pipeline.

5. The test method of the flameproof test system according to claim 4, characterized by comprising the following steps:

first-step gas distribution: opening a manual valve at the output end of one of the first combustible gas and the third group of gas tanks, opening two groups of adjusting and detecting gas circuits, one group of gas mixing gas circuits and one group of gas analyzing pipelines corresponding to the gas tanks in a test subsystem corresponding to the explosion-proof test tank of the sample to be tested, and closing other pipelines;

the tank controller in the testing subsystem simultaneously receives signals of gas flow meters and opening degrees of regulating valves in two groups of regulating and detecting gas paths, outputs control signals to the conduction valves at the front ends of the two gas flow meters to control the flow of single gas before mixing of each path, and opens the manual valve at the output end of the third gas tank if the third gas is required to be mixed after the oxygen content of the two gases is reached; closing the regulating valve at the output end of the gas mixing gas circuit;

the second step is that the gas replacement method is carried out on the explosion-proof test tank: there are two methods for gas replacement, and one of them can be selected;

1) gas replacement by a vacuum method:

opening all tank body input regulating valve groups and tank body output regulating valve groups corresponding to the flameproof test tank to be tested, simultaneously opening each regulating valve communicated with the vacuum pump, closing other regulating valves, opening the vacuum pump, vacuumizing the flameproof test tank, simultaneously carrying out pressure detection through a pressure sensor on a pipeline of the output regulating valve groups, and closing the regulating valves on the corresponding paths of the flameproof test tank and the vacuum pump when detecting that the air pressure in the corresponding flameproof test tank is a negative value;

opening an on-passage regulating valve of a combustible gas mixture output end regulating valve communicated with an explosion-proof test tank to be tested, uniformly filling the combustible gas mixture into two explosion-proof test tanks, and closing the regulating valves on passages of all combustible gas mixture output ends communicated with the explosion-proof test tanks when the combustible gas mixture in the explosion-proof test tanks is completely full and the pressure reaches a set value;

2) and (3) performing gas replacement by a simultaneous purging method:

opening a regulating valve at the output end of the combustible gas mixture and all regulating valves on all input and output passages of the explosion-proof test tank to be tested, simultaneously opening all passages between the explosion-proof test tank and an exhaust port to form that the combustible gas mixture flows in the two explosion-proof test tanks from left to right, replacing gas inside the explosion-proof test tank, opening and adjusting corresponding gas analysis pipelines to detect the concentration of gas blown out from the exhaust port, and if the concentration reaches the concentration of the combustible gas mixture entering the explosion-proof test tank, indicating that the replacement is finished, and closing all regulating valves under the control of a tank controller;

thirdly, carrying out explosion suppression test:

igniting under the control of a tank controller, carrying out explosion tests on samples in the two explosion-proof test tanks through an ignition pressure measuring device and a high-speed camera for data acquisition, monitoring the pressure and the temperature in the tanks after explosion to obtain a pressure waveform and a temperature change curve of a time period, and judging according to a test standard; the high-speed camera is placed outside the explosion-proof test tank, and shooting and collecting the flame propagation state during explosion through the observation window;

fourthly, purging pipelines from the explosion-proof test tank and from the explosion-proof test tank to an exhaust port: and opening a passage from the compressed air to the explosion-proof test tank to the vacuum pump, and blowing pipelines communicated with all the explosion-proof test tanks to the exhaust port in the tank body by the compressed air through the vacuum pump while vacuumizing.

6. The test method of the flameproof test system according to claim 5, characterized in that when the combustible gas required by the test of the two samples is the same, the two samples are respectively put into two flameproof test tanks of one test subsystem, and one path of gas distribution is performed in sequence, the two flameproof test tanks perform gas replacement simultaneously, the two flameproof test tanks perform flameproof test simultaneously, and the two flameproof test tanks perform purging on pipelines in the tank body and from the flameproof test tanks to the exhaust port simultaneously.

7. The test method of the flameproof test system according to claim 5, characterized in that when the flammable gas distribution bodies required by the two test samples are different, the two test samples are respectively put into the two flameproof test tanks of the two test subsystems, two paths of gas distribution are sequentially and simultaneously carried out, the two flameproof test tanks simultaneously carry out gas replacement, the two flameproof test tanks simultaneously carry out flameproof test, and the two flameproof test tanks simultaneously carry out purging on pipelines in the tank body and from the flameproof test tanks to the exhaust port.

Technical Field

The invention relates to a safety test technology of electrical equipment, in particular to an explosion-proof test system and a test method.

Background

The explosion-proof performance test of the explosion-proof electrical product is generally carried out in an explosion-proof test tank, and in order to enable the explosion-proof test tank to reach the combustible gas concentration range of the standard specified test, gas in the explosion-proof test tank is generally replaced by a configured combustible gas mixed gas through a vacuum method or a blowing method before the explosion-proof test, and the test is carried out after the requirement of the test gas is met. The specification of the explosion-proof test tank and the introduced combustible mixed gas are different in each experiment according to the structure and the test requirements of a test sample, a conventional test system is shown in figure 1, the system generally comprises units of ternary gas distribution, exhaust, air suction, air return and the like besides the explosion-proof test tank, the explosion-proof test tanks of various specifications are connected to a common pipeline, and peripheral equipment can be shared, so that the system is suitable for various explosion-proof tests.

The conventional configuration combustible gas in the ternary distribution is methane, hydrogen and compressed air, but with the diversification of the materials used by the sample, different configuration requirements are often met, the gas mixing combination which can be realized by the flame-proof testing system with the structure is less, different gas tanks need to be replaced each time, and time and labor are consumed.

As shown in figure 1, because 5 tanks share a conveying pipeline, the configured gas needs to be conveyed to the tank body through a long gas path for testing, only one mixed gas can be configured at a time, and only one tank body can be used for testing at a time. Resulting in low system utilization and considerable waste of gas on the piping in gas replacement, resulting in longer replacement times.

Disclosure of Invention

In order to improve the test efficiency of the existing explosion-proof test and reduce the labor, an explosion-proof test system and a test method are provided, so that the same group of steel cylinders can be used for configuring combustible gases with different components for different test groups, and the switching of the gases can be realized without influencing the gas distribution precision under the condition of not replacing the gases in the pipeline.

The technical scheme of the invention is as follows: a flame-proof test system comprises 5 flame-proof test tanks, wherein the volumes of the 5 flame-proof test tanks are from small to large, the system is divided into 3 independent test subsystems, only one flame-proof test tank with the smallest volume is arranged in the first test subsystem, and the other two test subsystems comprise two flame-proof test tanks which are connected in parallel;

each testing subsystem comprises three groups of adjusting and detecting gas circuits, a group of gas mixing gas circuits, a tank body input adjusting valve group, an explosion-proof testing tank, a tank body output adjusting valve group, a group of pressure adjusting gas circuits, a group of gas analyzing pipelines, a tank body controller, an ignition pressure measuring device, a high-speed camera and a plurality of temperature and pressure sensors; the three independent testing subsystems share one vacuum pump and various gas tanks for containing gas, methane, propane, ethylene and acetylene are used as a first group of gas tanks, hydrogen and nitrogen are used as a second group of gas tanks, oxygen and compressed air are used as a third group of gas tanks, the output end of each gas tank is connected with a manual valve, each gas tank of gas corresponds to a unique gas pipeline, the front ends of the hydrogen in the first group of gas tanks and the second group of gas tanks, which enters a first group of adjusting and detecting gas circuits, are respectively connected with a controllable conduction valve, the front ends of the second group of gas tanks, which enters the second group of adjusting and detecting gas circuits, are respectively connected with a controllable conduction valve, and the third group of gas tanks directly enters a third group of adjusting and detecting gas circuits; the output ends of the three groups of adjusting and detecting gas paths are connected with each explosion-proof test tank through a tank input adjusting valve group and a tank output adjusting valve group;

the two sides of each flameproof test tank are symmetrically provided with a plurality of groups of flameproof test tank inlet and outlet pipelines consisting of tank body input regulating valve groups, tank body output regulating valve groups and ventilation pipelines, and the inlet and outlet pipelines of each flameproof test tank are respectively connected with an exhaust port through a corresponding pressure regulating gas circuit, a corresponding gas analysis pipeline and a vacuum pump;

the pressure that the pressure sensor on regulation detection gas circuit, three gas mixture gas circuits of group and every flame proof test jar output pipeline detected, the temperature that the temperature sensor in every flame proof test jar detected, the oxygen content data that every group gas analysis pipeline detected, flame propagation state data send corresponding tank control ware when the explosion of shooting through the observation window at a high speed, tank control ware output control signal is to the conduction valve, the governing valve, ignition pressure measurement device, realizes the test.

The adjusting and detecting gas circuits corresponding to methane, propane, ethylene, acetylene, hydrogen, nitrogen and oxygen are the same, and the adjusting and detecting gas circuits sequentially comprise a first flame arrester, a manual valve, a filter, a pressure reducing valve, a pressure sensor, a conduction valve, a gas flowmeter, a second flame arrester and a one-way valve; the oxygen and the compressed air are used as non-combustible gas distribution gas, a regulation detection gas path of the oxygen and the compressed air is partially shared, the compressed air firstly passes through an oil mist separator after entering the regulation detection gas path, is output through a manual valve after being ensured to be dry by a cold dryer, and then sequentially enters a compressed air filter, a compressed air pressure reducing valve, a compressed air pressure sensor, a compressed air conduction valve, a non-combustible gas distribution gas flowmeter, a non-combustible gas distribution gas flame arrester and a non-combustible gas distribution gas one-way valve to enter a gas mixing gas path, and the oxygen and the compressed air partially share the non-combustible gas distribution gas flowmeter, the non-combustible gas distribution flame arrester and the non-combustible gas distribution one-way valve.

The gas mixing gas circuit sequentially comprises a static gas mixing device, a mixing container, a third flame arrester, a gas mixing gas circuit pressure sensor and an adjusting valve; the tail end of the gas mixing gas circuit is divided into three paths by a regulating valve, one path of the gas mixing gas circuit is introduced into a tank body input regulating valve group and a tank body output regulating valve group of the tank body controller, the other path of the gas mixing gas circuit is connected with an exhaust port through a pressure regulating gas circuit, and the other path of the gas mixing gas circuit is connected with an exhaust port through a gas analysis pipeline;

the pressure regulating valve is connected with one regulating valve in series and then connected with the other regulating valve in parallel to form a pressure regulating gas circuit; the regulating valve is connected in series with a gas analyzer to form a gas analysis pipeline.

The pressure regulating valve is connected with one regulating valve in series and then connected with the other regulating valve in parallel to form a pressure regulating gas circuit; a regulating valve is connected in series with a gas analyzer to form a gas analysis pipeline.

The test method of the explosion-proof test system specifically comprises the following steps:

first-step gas distribution: opening a manual valve at the output end of one of the first combustible gas and the third group of gas tanks, opening two groups of adjusting and detecting gas circuits, one group of gas mixing gas circuits and one group of gas analyzing pipelines corresponding to the gas tanks in a test subsystem corresponding to the explosion-proof test tank of the sample to be tested, and closing other pipelines;

the tank controller in the testing subsystem simultaneously receives signals of gas flow meters and opening degrees of regulating valves in two groups of regulating and detecting gas paths, outputs control signals to the conduction valves at the front ends of the two gas flow meters to control the flow of single gas before mixing of each path, and opens the manual valve at the output end of the third gas tank if the third gas is required to be mixed after the oxygen content of the two gases is reached; closing the regulating valve at the output end of the gas mixing gas circuit;

the second step is that the gas replacement method is carried out on the explosion-proof test tank: there are two methods for gas replacement, and one of them can be selected;

1) gas replacement by a vacuum method:

opening all tank body input regulating valve groups and tank body output regulating valve groups corresponding to the flameproof test tank to be tested, simultaneously opening each regulating valve communicated with the vacuum pump, closing other regulating valves, opening the vacuum pump, vacuumizing the flameproof test tank, simultaneously carrying out pressure detection through a pressure sensor on a pipeline of the output regulating valve groups, and closing the regulating valves on the corresponding paths of the flameproof test tank and the vacuum pump when detecting that the air pressure in the corresponding flameproof test tank is a negative value;

opening an on-passage regulating valve of a combustible gas mixture output end regulating valve communicated with an explosion-proof test tank to be tested, uniformly filling the combustible gas mixture into two explosion-proof test tanks, and closing the regulating valves on passages of all combustible gas mixture output ends communicated with the explosion-proof test tanks when the combustible gas mixture in the explosion-proof test tanks is completely full and the pressure reaches a set value;

2) and (3) performing gas replacement by a simultaneous purging method:

opening a regulating valve at the output end of the combustible gas mixture and all regulating valves on all input and output passages of the explosion-proof test tank to be tested, simultaneously opening all passages between the explosion-proof test tank and an exhaust port to form that the combustible gas mixture flows in the two explosion-proof test tanks from left to right, replacing gas inside the explosion-proof test tank, opening and adjusting corresponding gas analysis pipelines to detect the concentration of gas blown out from the exhaust port, and if the concentration reaches the concentration of the combustible gas mixture entering the explosion-proof test tank, indicating that the replacement is finished, and closing all regulating valves under the control of a tank controller;

thirdly, carrying out explosion suppression test:

igniting under the control of a tank controller, carrying out explosion tests on samples in the two explosion-proof test tanks through an ignition pressure measuring device and a high-speed camera for data acquisition, monitoring the pressure and the temperature in the tanks after explosion to obtain a pressure waveform and a temperature change curve of a time period, and judging according to a test standard; the high-speed camera is placed outside the explosion-proof test tank, and shooting and collecting the flame propagation state during explosion through the observation window;

fourthly, purging pipelines from the explosion-proof test tank and from the explosion-proof test tank to an exhaust port: and opening a passage from the compressed air to the explosion-proof test tank to the vacuum pump, and blowing pipelines communicated with all the explosion-proof test tanks to the exhaust port in the tank body by the compressed air through the vacuum pump while vacuumizing.

According to the test method of the explosion-proof test system, when combustible gas required by two test samples is the same, the two test samples are respectively placed into two explosion-proof test tanks of one test subsystem, one-way gas distribution is sequentially carried out, gas replacement is simultaneously carried out on the two explosion-proof test tanks, explosion-proof tests are simultaneously carried out on the two explosion-proof test tanks, and the two explosion-proof test tanks simultaneously carry out purging on pipelines in the tank bodies and from the explosion-proof test tanks to an exhaust port.

According to the test method of the explosion-proof test system, when the combustible gas distribution bodies required by the two test samples are different, the two test samples are respectively placed into the two explosion-proof test tanks of the two test subsystems, two paths of gas distribution are sequentially and simultaneously carried out, the two explosion-proof test tanks simultaneously carry out gas replacement, the two explosion-proof test tanks simultaneously carry out explosion-proof test, and the two explosion-proof test tanks simultaneously carry out purging on pipelines in the tank bodies and from the explosion-proof test tanks to the exhaust port.

The invention has the beneficial effects that: according to the explosion-proof test system and the test method, through system design, simultaneous gas distribution and simultaneous test of a plurality of samples can be completed, and the system utilization rate and the test efficiency are improved; gas in the pipeline does not need to be replaced in the gas distribution process, so that the gas distribution time is shortened; the flow regulation is combined with the oxygen-containing test to ensure the gas distribution precision.

Drawings

FIG. 1 is a schematic structural diagram of an explosion suppression testing device;

FIG. 2 is a schematic structural diagram of the flameproof test system of the present invention.

Reference numerals: 1. a gas tank; 2. a manual valve (SD); 3. a conduction valve (K); 4. flame arrestors (ZH); 5. a filter (GL); 6. pressure reducing valve (JF); 7. a pressure sensor (Y); 8. a gas flow Meter (MFC); 9. a one-way valve (DF); 10. a static gas mixing device (JH); 11. a mixing vessel (HC); 12. a regulating valve (ZK); 13. a tank controller; 14. an ignition pressure measuring device; 15. an explosion-proof test tank; 16. a sample; 17. a temperature sensor (W); 18. a high-speed camera; 19. a vacuum pump (ZB); 20. an exhaust port; 21. a pressure regulating valve (TY); 22. a gas analyzer; 23. an oil mist separator (YL); 24. a freeze dryer (LG).

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 2, the structure schematic diagram of the explosion-proof test system includes 5 explosion-proof test tanks, the 5 explosion-proof test tanks are from top to bottom, the volume is from small to large, the system is divided into 3 independent test subsystems, the 3 test subsystems can simultaneously test, only one explosion-proof test tank with the smallest volume is arranged in the first test subsystem, and the other two test subsystems include two explosion-proof test tanks connected in parallel. Each test subsystem uses the same combustible gas mixture for each test, and 3 test subsystems can simultaneously test by using 3 same or 3 different combustible gas mixtures.

The system comprises gas tanks, a plurality of groups of regulating and detecting gas circuits, three groups of gas mixing gas circuits, a tank body input regulating valve group, 5 explosion-proof test tanks, a tank body output regulating valve group, three groups of pressure regulating gas circuits, three groups of gas analysis pipelines, a vacuum pump, three tank controllers, three ignition pressure measuring devices, three high-speed cameras, a plurality of temperature and pressure sensors, methane, propane, ethylene and acetylene are used as a first group of gas tanks, hydrogen and nitrogen are used as a second group of gas tanks, oxygen and compressed air are used as a third group of gas tanks, the output ends of the gas tanks are connected with manual valves (SD1, SD2, SD3, SD4, SD8, SD9, SD13 and SD14), corresponding manual valves are opened according to the gas requirement of the required configuration, each gas tank corresponds to a unique gas pipeline, the front ends of hydrogen in the first group of gas tanks and the second group of gas tanks, which enters the first group of regulating and detecting gas circuits, are respectively connected with a controllable, the front end of the second group of gas tanks entering the second group of adjusting and detecting gas circuits is provided with a controllable conduction valve (K) corresponding to each gas pipeline, and the third group of gas tanks directly enter the third group of adjusting and detecting gas circuits. Three groups are adjusted and are detected gas circuit output and let in gas mixture gas circuit of the same kind, gas mixture gas circuit output is detected through the gas analysis pipeline again, up to detecting and reaching experiment distribution requirement, gas mixture gas circuit output is controlled by tank controller 13 and is got into flame proof test tank 15 and carry out the gas replacement, after flame proof test tank 15 is full of combustible gas mixture, it carries out the explosion experiment to sample 16 in the tank body to ignite, ignition pressure measuring device 14, tank body temperature sensor 17 and high speed camera 18 carry out the experimental data acquisition, tank controller 13 collects data, and control after the experiment carries out the residual gas of flame proof test tank and handle.

Every three groups of adjusting and detecting gas circuits correspond to a group of gas mixing gas circuits, and every group of gas mixing gas circuits corresponds to a group of pressure adjusting gas circuits and a group of gas analyzing pipelines.

The regulating and detecting gas circuits of methane, propane, ethylene, acetylene, hydrogen, nitrogen and oxygen are the same, and the regulating and detecting gas circuits sequentially comprise a first flame arrester 4(ZH), a manual valve (SD), a filter 5(GL), a pressure reducing valve 6(JF), a pressure sensor 7(Y), a conduction valve (K), a gas flowmeter 8(MFC), a second flame arrester (ZH) and a one-way valve 9 (DF); oxygen and compressed air are used as non-combustible gas, the regulation and detection gas path has partial sharing, the compressed air needs to be subjected to gas treatment firstly when entering the regulation and detection gas path, namely, the compressed air firstly passes through the oil mist separator 23(YL), is dried by the cold dryer 24(LG) and then is output through the manual valve SD14, and then sequentially passes through the filter GL10, the pressure reducing valve JF10, the pressure sensor Y13, the conduction valve (MFC), the gas flowmeter (MFC), the flame arrester (ZH) and the one-way valve (DF) to enter the gas mixing gas path, and the oxygen and the compressed air share the rear partial gas flowmeter (MFC), the flame arrester (ZH) and the one-way valve (DF).

The gas mixing gas circuit comprises a static gas mixing device 10(JH), a mixing container 11(HC), a flame arrester (ZH), a pressure sensor (Y) and a regulating valve 12(ZK) in sequence. The tail end of the gas mixing gas circuit is divided into three paths by regulating valves, one path of the gas mixing gas circuit is introduced into a tank body input regulating valve group and a tank body output regulating valve group of the tank body controller, the other path of the gas mixing gas circuit is connected with the exhaust port 20 through a pressure regulating gas circuit, and the other path of the gas mixing gas circuit is connected with the exhaust port 20 through a gas analysis pipeline. The pressure regulating valve (TY) is connected with one regulating valve (ZK) in series and then connected with the other regulating valve (ZK) in parallel to form a pressure regulating gas circuit. The regulating valve (ZK) is connected in series with a gas analyzer to form a gas analysis pipeline.

And the two sides of each flameproof test tank are symmetrically provided with a plurality of groups of flameproof test tank inlet and outlet pipelines consisting of tank body input regulating valve groups, tank body output regulating valve groups and ventilation pipelines, and the sample is arranged in the middle of each flameproof test tank body.

The inlet and outlet pipelines of each explosion-proof test tank are connected with an exhaust port 20 through a controllable regulating valve (ZK) and a vacuum pump.

The system carries out testing steps, namely, combustible gas mixture is configured in the first step, gas in the explosion-proof test tank is replaced in the second step, explosion-proof test is carried out in the third step, and finally, the explosion-proof test tank and pipelines from the explosion-proof test tank to an exhaust port are swept.

The specific test control of the second test subsystem is described below according to the test procedure by taking the second test subsystem as an example. The other two test subsystems work on the same principle.

First-step gas distribution: taking combustible gas and air as an example, wherein the configuration concentration is known, the ratio of methane and hydrogen in the combustible gas is known, manual valves SD1 and SD14 at the output ends of a methane gas tank and a compressed air gas tank are opened, a conduction valve at the front end of an adjustment detection gas path is opened under the control of a tank controller 13, methane sequentially passes through a flame arrester ZH8, a manual valve SD10, a filter GL4, a pressure reducing valve JF4, a pressure sensor Y5, a conduction valve K5, a gas flowmeter MFC4, a flame arrester ZH11 and a one-way valve DF4 in a first adjustment detection gas path to enter a second group of gas mixing gas paths, compressed air sequentially passes through an oil mist separator YL, a cold dryer LG, is dried and then passes through a manual valve 14, a filter GL10, a pressure reducing valve JF10, a pressure sensor Y13, a conduction valve K8, a gas flowmeter MFC 6866, a ZH13 and a one-way valve DF6 in a third adjustment detection gas mixing gas path to enter a second group of gas mixing gas paths, and static gas mixing gas path, The mixed container HC2, a flame arrester ZH14, a pressure sensor Y8 and an adjusting valve ZK10 output, the mixed gas enters ZK19 and a gas analyzer in a second group of gas analysis pipelines through the adjusting valves ZK12 and ZK15 which are opened, the gas analyzer is sent to the tank controller 13 after oxygen content analysis, the tank controller 13 simultaneously receives opening signals of MFC4 and MFC6 and adjusting valves ZK10, ZK12 and ZK15 of a gas flowmeter, the tank controller 13 outputs control signals to a conduction valve K5 and K7 at the front end of the MFC to control the flow of single gas before mixing in each pipeline, after the oxygen content of the mixed gas reaches the mixed gas of methane and air, an SD valve 8 at the output end of the hydrogen tank is opened, a conduction valve at the front end of a detection gas pipeline is opened under the control of the tank controller 13, and the hydrogen sequentially passes through the flame arrester ZH9, the SD valve SD11, the GL filter 5, the JF pressure reducing valve 5, the pressure sensor Y6, the K6 and, And the gas flow meter MFC5, the flame arrester ZH12 and the check valve DF5 enter a second group of gas mixing gas circuits to be mixed with the mixed gas prepared in the front, and the tank controller 13 controls and adjusts the conduction valve K6 at the front end of the gas flow meter MFC5 to control the hydrogen flow until the gas analyzer detects that the oxygen content reaches the required concentration obtained by calculation, so that the gas distribution of the combustible gas is completed. Turn off ZK10, ZK12, ZK15, ZK 19.

The used gas of distribution generally all stores in high-pressure cylinder, has very big potential safety hazard as combustible gas in transportation process, consequently has all set up the spark arrester at the both ends of adjusting the detection gas circuit, and the air is the incombustible gas body, and factor of safety is high relatively, consequently only sets up the spark arrester before getting into the mixture, sets up the spark arrester after the combustible mixture, carries out safety protection to the mixed section.

The gas analyzer 22 comprises an oxygen meter tank controller 13 which converts the oxygen content in each process of the mixing scheme according to the configured concentration and the proportion requirement among various combustible gases, converts the oxygen content into the flow rate and sequentially controls the configuration.

And a second step of simultaneously carrying out gas replacement on the two explosion-proof test tanks: gas replacement is performed by one of two methods.

1. And simultaneously performing gas replacement by a vacuum method:

opening the tank body input regulating valve group and the tank body output regulating valve group of the two flameproof test tanks, simultaneously opening regulating valves ZK 12-ZK 16 and ZK5 communicated with the vacuum pump, closing other regulating valves, opening the vacuum pump ZB, simultaneously vacuumizing the two flameproof test tanks, simultaneously carrying out pressure detection through a pressure sensor on a pipeline of the output regulating valve group, and closing regulating valves ZK 13-ZK 16 and ZK5 on a passage between the corresponding flameproof test tank and the vacuum pump ZB when detecting that the air pressure in the corresponding flameproof test tank is a negative value;

opening the regulating valve on the passage of the combustible gas mixed gas output end regulating valve ZK10 communicated with the two flameproof test tanks, uniformly filling the combustible gas mixed gas into the two flameproof test tanks, and closing the regulating valve on the passage of the combustible gas mixed gas output end communicated with the two flameproof test tanks when the combustible gas mixed gas in the flameproof test tanks is completely full (the pressure reaches a set value) through measurement.

As shown in figure 2, the connecting regulating valve ZK12 is opened between the input and output regulating valve groups of the two explosion-proof test tanks, and after vacuumizing, combustible gas mixture can inflate the explosion-proof test tanks from the input and output ends, so that the inflation is uniform and rapid.

2. And (3) performing gas replacement by a simultaneous purging method:

open combustible gas mixture output end governing valve ZK10 and two flame proof test jar inputs, all governing valves on the output passage, open all passages (governing valve ZK13, ZK15, ZK17, ZK18) between two flame proof test jar and gas vent 20 simultaneously, it flows to form combustible gas mixture and advance right side in the interior left side of two flame proof test jar, replace the inside gas of two flame proof test jar, open governing valve ZK19, detect the gas vent through gas analyzer 22 and blow out gas concentration, when concentration reaches the combustible gas mixture concentration that gets into in the flame proof test jar, explain the replacement and accomplish, close all governing valves under the control of jar controller.

Thirdly, simultaneously carrying out explosion suppression tests on the two explosion suppression test tanks:

and (3) igniting under the control of a tank controller 13, carrying out explosion tests on samples in the two explosion-proof test tanks through an ignition pressure measuring device 14 and a high-speed camera 18 to acquire data, monitoring the pressure and the temperature in the tanks after explosion to obtain a pressure waveform and a temperature change curve of a time period, and judging according to a test standard. The high-speed camera is placed outside the explosion-proof test tank, and the flame propagation state during explosion is shot and collected through the observation window.

And finally, purging pipelines from the explosion-proof test tank and from the explosion-proof test tank to an exhaust port: opening SD14, K8, ZK11, ZK14, ZK16 and ZK5 and input and output regulating valve groups of two explosion-proof test tanks, and vacuumizing and purging the tank body and all pipelines communicated with the back by compressed air.

The type of gas required by the second test subsystem is changed as follows, if methane is changed into acetylene, as long as hydrogen and air are mixed, after the oxygen contents of the two gases are detected, SD10, K5, DF4, ZK10, ZK12, ZK15, ZK17, ZK18 and ZK19 from the acetylene regulation detection gas circuit and the gas mixing gas circuit to the pipeline of the vacuum pump are opened, the gas is naturally communicated with an exhaust port through a pressure regulation gas circuit and a gas analysis pipeline, and when the oxygen contents are detected by gas analysis to meet the actual requirement, the requirement of the gas required to be configured can be directly indicated.

Gas distribution examples: for example, to prepare a 12.5% mixture of combustible gas and air, wherein the ratio of methane to hydrogen in the combustible gas is 58:42, the methane is first mixed with the air, since the ratio of methane in the final mixture should be 12.5% 58%, then the air content should be (100% -12.5% 58%), and the measured oxygen content should be (100% -12.5% 58%) 20.95%, which is about 18.43%; (default oxygen content in air 20.95%); and mixing the prepared mixed gas with hydrogen, wherein the change of the oxygen representation value is only required to be observed, the flow of methane is not required to be adjusted, and the combustible gas is mixed completely as long as the oxygen content reaches the standard. The oxygen content of the final gas mixture should be (100% -12.5%) 20.95%, about 18.33%.

The system has two flameproof test tanks, and a gas passage is designed for flameproof test under a set of control system, so that the same combustible gas can be conveniently used for simultaneously testing two samples, and the test time is saved; the minimum explosion-proof test tank is independent of the control system, so that the system is convenient to use independently, the capacity is small, and the configuration speed is high; and multiple paths of in and out ensure that various tested structures can be applied and simultaneously detected, and the combination of multiple paths of out and various discharge modes can change the realization of various suitable ventilation modes according to the requirements of various gas and sample structures, thereby ensuring the efficiency and the accuracy of the explosion suppression test of the system. In addition, the design of the pressure regulating device can regulate the pressure of the whole gas replacement, control the process speed of the gas replacement and ensure the replacement precision. The number of groups of input and output regulating valves of each explosion-proof test tank which are put into use can be selected according to the structure and the size of a sample, and all regulating valves are not required to be used every time. All set up pressure sensor on the output control valve group pipeline with cavity connecting line in the sample for output gas pressure detection in the cavity, only need have pressure sensor can detect jar body output pressure on a set of pipeline on the output control valve group pipeline with explosion proof test jar connecting line, output pressure detects and jar internal pressure detects, the adjustment of being convenient for.

The whole system is reasonably designed, various gases can be conveniently configured, the gases in various gas conveying pipelines at the front end of the gas distribution are unique gases, purging and replacement are not needed, and waste of gas sources is avoided. The gas distribution and mixing at the front end of the explosion-proof test tank are properly designed, and frequent purging and replacement are avoided.