A multi-sampling point gas detection system and a gas circulation detection method

Abstract

The present application discloses a multi-sampling point gas detection system and a gas circulation detection method, which relate to the field of gas detection technology. The system includes two gas analysis devices, an exhaust device, multiple sampling devices and multiple gas delivery devices; the sampling devices and the gas delivery devices are connected one-to-one through pipelines; the sampling devices are used to sample the gas at the corresponding sampling points, and the gas outlet of the sampling device is connected to the gas inlet of the corresponding gas delivery device through a pipeline; the first gas outlet of each of the gas delivery devices is connected to the exhaust device through a pipeline, the second gas outlet of each of the gas delivery devices is connected to one of the gas analysis devices through a pipeline, and the third gas outlet of each of the gas delivery devices is connected to another gas analysis device through a pipeline. The present application realizes patrol inspection of multi-point gas through two gas analysis devices.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a multi-sampling point gas detection system and a gas circulation detection method. Background Art

[0002] When it comes to gas detection at industrial sites, traditional detection methods mostly use a "one-to-many" system or a "one-to-one" system; the "one-to-many" system uses a set of analyzers to detect gases at multiple sampling points in turn, while the "one-to-one" system uses a set of analyzers to detect only one sampling point.

[0003] For the traditional "one-to-many" system, when the gas at each sampling point is detected and analyzed, it is necessary to wait until the gas at the sampling point completely replaces the gas in the pipeline. In this way, the data measured by the analyzer is the actual gas data corresponding to the sampling point. Therefore, the gas detection results of the "one-to-many" system have high delay and lag; in addition, since there is only one analyzer in the system, when this analyzer fails and the detection data is inaccurate, it will cause the corresponding data of all sampling points during the analyzer failure period to be inaccurate, and the staff will not be able to know in time that the instrument has a detection failure, which will cause erroneous data guidance for the production process and have a greater impact on the enterprise; and for the traditional "one-to-one" system, since one set of analyzers only detects the gas at one sampling point, therefore, when there are more sampling points, more analyzers are required, which will not only increase the cost, but also occupy a larger volume.

[0004] In summary, the existing "one-to-many" system has problems such as high delay and lag in detection results, and failure of the analyzer to be detected promptly and accurately. The existing "one-to-one" system also has problems such as high application cost and large volume, and both cannot meet the user's needs. Summary of the invention

[0005] In order to solve one or more of the above-mentioned technical problems, the present application provides a multi-sampling point gas detection system and a gas circulation detection method.

[0006] In the first aspect, the present application provides a multi-sampling point gas detection system, which adopts the following technical solution:

[0007] A multi-sampling point gas detection system comprises: two gas analysis devices, an exhaust device, a plurality of sampling devices and a plurality of gas delivery devices; the sampling devices and the gas delivery devices are connected one by one through pipelines.

[0008] The sampling device is used to sample the gas at the corresponding sampling point, and the gas outlet of the sampling device is connected to the gas inlet of the corresponding gas delivery device through a pipeline; the first gas outlet of each gas delivery device is connected to the exhaust device through a pipeline, the second gas outlet of each gas delivery device is connected to one of the gas analysis devices through a pipeline, and the third gas outlet of each gas delivery device is connected to another gas analysis device through a pipeline.

[0009] By adopting the above technical solution, 1) a redundant gas analysis device is added to the system, and two gas analysis devices are used to cooperate with each other to extract and detect the gas at multiple sampling points, which not only improves the accuracy of the gas detection results at the sampling points, but also when the number of sampling points increases, the gas inspection can still be achieved without adding gas analysis devices, and is not limited by the number of sampling points. Compared with the traditional "one-to-one" system, the cost and volume occupancy are greatly reduced; 2) when the data measured by the two gas analysis devices have a large deviation, the staff can also promptly discover the faulty gas analysis device. During the maintenance of a certain gas analysis device, the other gas analysis device can still perform gas inspections at different sampling points in the system. Carry out detection in turns, so that users can still obtain accurate detection data, avoid affecting the normal production process, and avoid problems that are difficult to find when the detection instrument fails in the traditional "one to many" system; 3) Through the exhaust device, when there is no need to perform gas detection at a certain sampling point, the gas at the sampling point can be discharged through the exhaust device. The exhaust device can ensure that each sampling point always has an air pump to extract gas, thereby ensuring the real-time nature of the gas in the pipeline. When the gas at the sampling point needs to be detected, the gas can be quickly transported to the corresponding gas analysis device, which improves the efficiency of gas detection and avoids the problem of gas transmission and detection delays caused by the suspension of pipeline gas extraction in the traditional "one to many" system.

[0010] In a specific implementation scheme, the gas analysis device includes a first air pump and a gas analyzer connected in sequence through a pipeline; the exhaust device includes a second air pump; the gas delivery device includes a first three-way solenoid valve and a second three-way solenoid valve;

[0011] Wherein, the air outlet of the sampling device is connected to the air inlet of the first three-way solenoid valve through a pipeline, and the first air outlet of the first three-way solenoid valve is connected to the air inlet of the exhaust device through a pipeline;

[0012] The second gas outlet of the first three-way solenoid valve is connected to the gas inlet of the second three-way solenoid valve through a pipeline, the first gas outlet of the second three-way solenoid valve is connected to the gas inlet of one of the gas analysis devices through a pipeline, and the second gas outlet of the second three-way solenoid valve is connected to the gas inlet of another gas analysis device through a pipeline.

[0013] By adopting the above technical scheme, a first air pump and a gas analyzer are used in the gas analysis device, and the gas in the pipeline can be pumped into the gas analyzer through the first air pump; only the second air pump is used in the exhaust device to extract the gas in the pipeline; two three-way solenoid valves are used in the gas delivery device, and the connection design between different air outlets of the three-way solenoid valves and the first and second air pumps of the subsequent stages makes it possible to connect the air outlets of each gas delivery device with the two gas analysis devices and the exhaust device, and the conduction control of each pipeline can be realized through the three-way solenoid valve, thereby ensuring the orderly transmission of the gas extracted by different sampling devices in the system.

[0014] In a specific embodiment, the gas delivery device further comprises a second two-way solenoid valve, a third two-way solenoid valve and a fourth two-way solenoid valve;

[0015] The second two-way solenoid valve is connected to the pipeline between the first air outlet of the first three-way solenoid valve and the exhaust device;

[0016] The third two-way solenoid valve is connected to the pipeline between the first gas outlet of the second three-way solenoid valve and the corresponding gas analysis device;

[0017] The fourth two-way solenoid valve is connected to a pipeline between the second gas outlet of the second three-way solenoid valve and a corresponding gas analysis device.

[0018] In a specific embodiment, the system further comprises a plurality of pre-filtering devices; the pre-filtering devices are connected to the pipeline between the sampling device and the gas delivery device;

[0019] The pre-filter device comprises a first filter and a first drainage pump; the air inlet of the first filter is connected to the sampling device through a pipeline, the air outlet is connected to the air inlet of the gas delivery device through a pipeline, and the liquid discharge port is connected to the liquid inlet of the first drainage pump through a pipeline;

[0020] The pre-filter device is used to filter moisture and impurities in the pipeline gas.

[0021] By adopting the above technical solution, the first filter is used to filter moisture and impurities in the pipeline gas, and the first drain pump is used to quickly extract the liquid from the drain port of the first filter and take away the impurities at the same time, thereby avoiding liquid retention inside the first filter, ensuring the filtering effect of the first filter, and improving the accuracy of subsequent gas detection results.

[0022] In a specific possible implementation scheme, the system further comprises a plurality of condensing devices; the condensing devices are connected to the gas inlet end of the gas analysis device and the gas inlet end of the exhaust device in a one-to-one correspondence through pipelines;

[0023] The condensing device comprises a condenser and a second drainage pump; the condenser is used to condense the moisture in the pipeline gas and discharge the moisture through the second drainage pump.

[0024] By adopting the above technical solution, the gas entering the gas analysis device and the exhaust device is condensed in advance to achieve gas-liquid separation, thereby improving the detection accuracy of the gas analysis device and making the reliability of the gas detection results higher.

[0025] In a specific possible implementation manner, the gas analysis device further comprises a first needle valve;

[0026] One end of the first needle valve is connected to the pipeline between the first vacuum pump and the gas analyzer. The first needle valve is used to discharge excess gas from the outlet of the first vacuum pump and control the flow entering the gas analyzer.

[0027] In a specific possible implementation scheme, the system further includes two calibration devices and two calibration gas switching devices; the calibration gas switching devices are connected to the calibration devices in a one-to-one correspondence, and the calibration gas switching devices are also connected to the gas analysis devices in a one-to-one correspondence;

[0028] Among them, the calibration device includes multiple standard gas storage devices, each standard gas storage device stores a type of standard gas, the gas outlet of each standard gas storage device is connected to the gas inlet of the standard gas switching device through a pipeline, and the gas outlet of the standard gas switching device is connected to the gas analysis device through a pipeline.

[0029] The standard gas switching device is used to control the introduction of standard gas into the gas analysis device to calibrate the gas analysis device.

[0030] By adopting the above technical solution, the gas detection accuracy of the gas analyzer is guaranteed.

[0031] In a specific possible implementation scheme, the gas analysis device further includes a third three-way solenoid valve, and the standard gas switching device includes a switching valve;

[0032] The third three-way solenoid valve is connected to the pipeline between the first air pump and the gas analyzer; the third three-way solenoid valve is connected to the pipeline between the first air pump and the gas analyzer; the air outlet of each calibration gas storage device in the calibration device is connected to the different air inlets of the switching valve through a pipeline; the air outlet of the switching valve is connected to the second air inlet of the third three-way solenoid valve through a pipeline.

[0033] In a second aspect, the present application provides a gas circulation detection method, which is applied to the multi-sampling point gas detection system described in the first aspect or any possible implementation scheme of the first aspect, and the gas circulation detection method includes:

[0034] The two gas analysis devices are named as the first gas analysis device and the second gas analysis device respectively; the multiple sampling devices are named as the first sampling device, the second sampling device, the third sampling device...the nth sampling device respectively; according to the set detection rules, the first gas analysis device and the second gas analysis device are used to perform cyclic detection on the gases sampled by the first sampling device to the nth sampling device.

[0035] In a specific implementation scheme, the detection rule includes:

[0036] At the detection time t1, the connection passage between the first sampling device and the first gas analysis device, the connection passage between the second sampling device and the second gas analysis device, and the connection passage between other sampling devices and the exhaust device are respectively opened, so that the first gas analysis device detects the gas sampled by the first sampling device, the second gas analysis device detects the gas sampled by the second sampling device, and the gas of other sampling devices is discharged through the exhaust device;

[0037] At the detection time t2, the connection passage between the second sampling device and the first gas analysis device, the connection passage between the third sampling device and the second gas analysis device, and the connection passage between other sampling devices and the exhaust device are respectively opened, so that the first gas analysis device detects the gas sampled by the second sampling device, the second gas analysis device detects the gas sampled by the third sampling device, and the gas of other sampling devices is discharged through the exhaust device;

[0038] At the detection time t3, the connection passage between the third sampling device and the first gas analysis device, the connection passage between the fourth sampling device and the second gas analysis device, and the connection passage between other sampling devices and the exhaust device are respectively opened, so that the first gas analysis device detects the gas sampled by the third sampling device, the second gas analysis device detects the gas sampled by the fourth sampling device, and the gas of other sampling devices is discharged through the exhaust device;

[0039] Traverse the first sampling device to the nth sampling device until at the detection time tn, respectively open the connection path between the nth sampling device and the first gas analysis device, the connection path between the first sampling device and the second gas analysis device, and the connection path between other sampling devices and the exhaust device, so that the first gas analysis device detects the gas sampled by the nth sampling device, the second gas analysis device detects the gas sampled by the first sampling device, and the gas of other sampling devices is discharged through the exhaust device, completing a gas cycle detection.

[0040] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0041] 1. A redundant gas analysis device is added to the system. Two gas analysis devices are used to cooperate with each other to extract and detect the gas at multiple sampling points. This not only improves the accuracy of the gas detection results at the sampling points, but also allows gas inspection to be realized without adding gas analysis devices when the number of sampling points increases. It is not limited by the number of sampling points. Compared with the traditional "one-to-one" system, it greatly reduces the cost and volume occupancy;

[0042] 2. When the data measured by the two gas analysis devices show a large deviation, the staff can also find the faulty gas analysis device in time. During the maintenance of a gas analysis device, the other gas analysis device can still detect the gas at different sampling points in the system in turn. For users, accurate test data can still be obtained to avoid affecting the normal production process and avoid problems that are difficult to find when the detection instrument fails in the traditional "one-to-many" system;

[0043] 3. Through the exhaust device, when there is no need to perform gas detection at a certain sampling point, the gas at the sampling point can be discharged through the exhaust device. The use of the exhaust device can ensure that each sampling point always has an air pump to extract gas, thereby ensuring the real-time nature of the gas in the pipeline. When the gas at the sampling point needs to be detected, the gas can be quickly transported to the corresponding gas analysis device, which improves the efficiency of gas detection and avoids the problem of gas transmission and detection delays caused by the suspension of pipeline gas extraction in the traditional "one-to-many" system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a partial structural diagram of a multi-sampling point gas detection system in an embodiment of the present application;

[0045] Figure 2 It is a schematic diagram of the overall structure of a multi-sampling point gas detection system in an embodiment of the present application;

[0046] Figure 3It is a first structural schematic diagram of a multi-sampling point gas detection system in an embodiment of the present application;

[0047] Figure 4 is a second structural schematic diagram of a multi-sampling point gas detection system in an embodiment of the present application;

[0048] Figure 5 It is a third structural schematic diagram of the multi-sampling point gas detection system in the embodiment of the present application;

[0049] Figure 6 It is a schematic diagram of the main process of the gas circulation detection method in the embodiment of the present application.

[0050] Description of reference numerals:

[0051] 1. Gas analysis device; 11. First air pump; 12. Gas analyzer; 13. Particulate filter; 14. First needle valve; 15. Membrane filter; 16. Flow meter; 17. Third three-way solenoid valve; 18. Second needle valve; 2. Exhaust device; 21. Second air pump; 3. Sampling device; 31. Fifth two-way solenoid valve; 32. Sixth two-way solenoid valve; 33. Seventh two-way solenoid valve; 4. Gas delivery device; 41. First three-way solenoid valve; 42. Second three-way solenoid valve; 43. Second two-way solenoid valve; 44. Third two-way solenoid valve; 45. Fourth two-way solenoid valve; 5. Pre-filter device; 51. First filter; 52. First drain pump; 6. Condensation device; 61. Condenser; 62. Second drain pump; 7. Calibration device; 8. Calibration gas switching device; 81. Switching valve; 9. Manual control device. DETAILED DESCRIPTION

[0052] In order to enable technicians in this field to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0053] In the description of the embodiments of the present application, words such as "for example" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "for example" or "for example" is intended to present related concepts in a specific way.

[0054] In the description of the embodiments of the present application, the term "multiple" means two or more. For example, multiple systems refer to two or more systems. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0055] The present application provides a multi-sampling point gas detection system for detecting gases at multiple sampling points, such as Figure 1 As shown, the system includes two gas analysis devices 1, an exhaust device 2, multiple sampling devices 3 and multiple gas delivery devices 4; the sampling devices 3 and the gas delivery devices 4 are connected one-to-one through pipelines; it can be understood by those skilled in the art that the number of the sampling devices 3 and the gas delivery devices 4 is the same and they are connected one-to-one;

[0056] The sampling device 3 is used to sample the gas at the corresponding sampling point, and the gas outlet of the sampling device 3 is connected to the gas inlet of the corresponding gas delivery device 4 through a pipeline; the first gas outlet of each gas delivery device 4 is connected to the exhaust device 2 through a pipeline, the second gas outlet of each gas delivery device 4 is connected to one of the gas analysis devices 1 through a pipeline, and the third gas outlet of each gas delivery device 4 is connected to another gas analysis device 1 through a pipeline.

[0057] Those skilled in the art will appreciate that the gas detection system of the present application is suitable for situations with a large number of sampling points, such as 3 or more.

[0058] Two gas analysis devices 1, one exhaust device 2, and sampling devices 3 and gas delivery devices 4 corresponding to different sampling points are used in the detection system, and the connection method of the present application allows the gases at different sampling points to pass through the corresponding connected sampling devices 3 and gas delivery devices 4 in sequence and enter different gas analysis devices 1 or exhaust devices 2.

[0059] This design has the following advantages:

[0060] 1. A redundant gas analysis device is added to the system. Two gas analysis devices 1 are used to cooperate with each other to extract and detect the gas at multiple sampling points. This not only improves the accuracy of the gas detection results at the sampling points, but also when the number of sampling points increases, the gas inspection can still be achieved without adding gas analysis devices 1. It is not limited by the number of sampling points. Compared with the traditional "one-to-one" system, the cost and volume occupation are greatly reduced;

[0061] 2. When the data measured by the two gas analysis devices 1 show a large deviation, the staff can also find the faulty gas analysis device 1 in time. During the maintenance of a certain gas analysis device 1, the other gas analysis device 1 can still detect the gas at different sampling points in the system in turn. For users, accurate detection data can still be obtained to avoid affecting the normal production process and avoid problems that are difficult to find when the detection instrument fails in the traditional "one-to-many" system;

[0062] 3. When there is no need to perform gas detection at a certain sampling point, the gas at the sampling point can be discharged through the exhaust device 2. The exhaust device 2 can ensure that each sampling point always has an air pump to extract gas, thereby ensuring the real-time nature of the gas in the pipeline. When the gas at the sampling point needs to be detected, the gas can be quickly transported to the corresponding gas analysis device 1, thereby improving the efficiency of gas detection and avoiding the problem of gas transmission and detection delays caused by the suspension of pipeline gas extraction in the traditional "one-to-many" system.

[0063] In a possible implementation, based on this structure, the detection of the sampling point can be increased by adding a sampling device 3. For the added sampling device 3, it is only necessary to adopt the same connection method, connect it to the corresponding gas delivery device 4, and then connect it to the gas analysis device 1 and the exhaust device 2 respectively;

[0064] Of course, on the basis of this structure, the reliability of the system can be further improved by adding gas analysis devices 1, but the relative cost and volume occupied will also be greater. Technical personnel in this field can determine the number of gas analysis devices 1 in the system based on actual detection needs; for the added gas analysis devices 1, it is only necessary to connect the outlet of each gas delivery device 4 to the inlet of the gas analysis device 1 respectively.

[0065] In a possible implementation, Figure 4 As shown, the gas analysis device 1 includes a first air pump 11 and a gas analyzer 12 connected in sequence through pipelines; the exhaust device 2 includes a second air pump 21; Figure 3 As shown, the gas delivery device 4 includes a first three-way solenoid valve 41 and a second three-way solenoid valve 42;

[0066] Among them, Figure 3 As shown, the air outlet of the sampling device 3 is connected to the air inlet of the first three-way solenoid valve 41 through a pipeline, and the first air outlet of the first three-way solenoid valve 41 is connected to the air inlet of the exhaust device 2 through a pipeline;

[0067] The second gas outlet of the first three-way solenoid valve 41 is connected to the gas inlet of the second three-way solenoid valve 42 through a pipeline, the first gas outlet of the second three-way solenoid valve 42 is connected to the gas inlet of one of the gas analysis devices 1 through a pipeline, and the second gas outlet of the second three-way solenoid valve 42 is connected to the gas inlet of another gas analysis device 1 through a pipeline.

[0068] It can be understood by those skilled in the art that by using a first three-way solenoid valve 41 and a second three-way solenoid valve 42 in the gas delivery device 4, the connection of different pipelines can be achieved by controlling the corresponding switches of the first three-way solenoid valve 41 and the second three-way solenoid valve 42 in the passage, so that the gas of the sampling device 3 can enter the subsequent gas analysis device 1, or be directly discharged from the exhaust device 2.

[0069] Through the above design, the first air pump 11 and the gas analyzer 12 are used in the gas analysis device 1, and the gas in the pipeline can be pumped into the gas analyzer 12 through the first air pump 11; in the exhaust device 2, only the second air pump 21 is used to extract the gas in the pipeline; two three-way solenoid valves are used in the gas delivery device, and the connection design between the different air outlets of the two three-way solenoid valves and the first air pump 11 and the second air pump 21 of the subsequent stage is made so that the air outlet of each gas delivery device 4 is connected with the two gas analysis devices 1 and the exhaust device 2, and after the system is powered on, the conduction control of each pipeline is realized through the logical control of the first three-way solenoid valve 41 and the second three-way solenoid valve 42, so as to ensure the orderly transmission of the gas extracted by different sampling devices 3 in the system.

[0070] Furthermore, if Figure 3 As shown, the first air outlets of the first three-way solenoid valves 41 are connected by pipelines; the first air outlets of the second three-way solenoid valves 42 are connected by pipelines; and the second air outlets of the second three-way solenoid valves 42 are connected by pipelines. Figure 3 As shown, the first gas outlet of each first three-way solenoid valve 41 is connected through a pipeline and then connected to the gas inlet of the exhaust device 2; the first gas outlet of each second three-way solenoid valve 42 is connected through a pipeline and then connected to the gas inlet of a gas analysis device 1; the second gas outlet of each second three-way solenoid valve 42 is connected through a pipeline and then connected to the gas inlet of another gas analysis device 1. Through such a design, the outputs of the gas delivery device 4 are connected to each other, which can save the use of pipelines and make the arrangement more neat.

[0071] In a possible implementation, Figure 4As shown, the gas analysis device 1 further includes a second needle valve 18; both ends of the first air pump 11 are connected to both ends of the second needle valve 18 through pipelines. The second needle valve 18 is connected to both ends of the first air pump 11, and by adjusting the opening of the second needle valve 18, the first air pump 11 can form an air circuit, thereby controlling the outlet flow of the first air pump 11 and reducing the influence of flow fluctuation on the stability of the air circuit.

[0072] In a possible implementation, Figure 3 As shown, the gas delivery device 4 further includes a second two-way solenoid valve 43, a third two-way solenoid valve 44 and a fourth two-way solenoid valve 45;

[0073] The second two-way solenoid valve 43 is connected to the pipeline between the first air outlet of the first three-way solenoid valve 41 and the exhaust device 2;

[0074] The third two-way solenoid valve 44 is connected to the pipeline between the first gas outlet of the second three-way solenoid valve 42 and the corresponding gas analysis device 1;

[0075] The fourth two-way solenoid valve 45 is connected to the pipeline between the second gas outlet of the second three-way solenoid valve 42 and the corresponding gas analysis device 1 .

[0076] In actual practice, after the three-way solenoid valve has been running for a long time or has been contaminated, it may not be able to close 100%, and there will be slight air leakage. Therefore, by adding a two-way solenoid valve to the rear end of each three-way solenoid valve, the gas path can be better controlled to prevent the slight leakage of the three-way solenoid valve from causing cross-flow between the gas paths, thereby avoiding affecting the detection accuracy of the subsequent gas analysis device 1.

[0077] In one possible implementation, refer to Figure 2 , the system further comprises a plurality of pre-filtering devices 5; the pre-filtering devices 5 are connected to the pipeline between the sampling device 3 and the gas delivery device 4;

[0078] Further, refer to Figure 5 The pre-filter device 5 includes a first filter 51 and a first drainage pump 52; the air inlet of the first filter 51 is connected to the sampling device 3 through a pipeline, the air outlet is connected to the air inlet of the gas delivery device 4 through a pipeline, and the liquid discharge port is connected to the liquid inlet of the first drainage pump 52 through a pipeline;

[0079] Those skilled in the art can understand that the first filter 51 is used to filter moisture and impurities in the pipeline gas, and the first drain pump 52 is used to quickly extract the liquid from the drain port of the first filter 51 and take away the impurities at the same time, thereby avoiding liquid from being retained inside the first filter 51, ensuring the filtering effect of the first filter 51, and improving the accuracy of subsequent gas detection results.

[0080] Further, refer to Figure 5 The discharge ports of the first drainage pumps 52 are connected by pipelines for discharge, which saves the use of pipelines and avoids occupying a large volume.

[0081] Therefore, by adding a pre-filter device 5 at the front end of the gas delivery device 4, the gas entering the gas delivery device 4 can be initially filtered to prevent impurities in the gas from clogging the subsequent electromagnetic valve, thereby ensuring the fluidity of the gas.

[0082] In one possible implementation, refer to Figure 2 The system further comprises a plurality of condensing devices 6; the condensing devices 6 are connected to the air inlet end of the gas analysis device 1 and the air inlet end of the exhaust device 2 in a one-to-one correspondence through pipelines;

[0083] Reference Figure 5 The condensing device 6 includes a condenser 61 and a second drainage pump 62 ; the condenser 61 is used to condense the moisture in the pipeline gas and discharge the moisture through the second drainage pump 62 .

[0084] Further, refer to Figure 5 If the condenser 61 adopts a double-outlet condenser, then one condenser 61 is connected to two second drainage pumps 62; preferably, the drainage ports of each of the second drainage pumps 62 are connected by a pipeline for discharge, which saves the use of pipelines and avoids occupying a large volume.

[0085] Therefore, the gas entering the gas analysis device 1 and the exhaust device 2 is condensed in advance by the condensation device 6 to achieve gas-liquid separation, and the detection accuracy of the gas analysis device is improved, and the reliability of the gas detection result is higher.

[0086] In one possible implementation, refer to Figure 4 , the gas analysis device 1 further comprises a first needle valve 14;

[0087] One end of the first needle valve 14 is connected to the pipeline between the first vacuum pump 11 and the gas analyzer 12 , and the first needle valve 14 is used to discharge excess gas from the outlet of the first vacuum pump 11 and control the flow entering the gas analyzer 12 .

[0088] Technical personnel in this field can determine the opening degree of the first needle valve 14 according to actual conditions. Since the gas flow rate at the outlet of the first vacuum pump 11 is usually greater than the flow rate required by the gas analyzer 12, a portion of the gas is discharged through the first needle valve 14, so that the gas flow rate entering the gas analyzer 12 can meet actual needs.

[0089] In one possible implementation, refer to Figure 4 , the gas analysis device 1 further comprises a particulate matter filter 13;

[0090] The particle filter 13 is connected to the pipeline between the first air pump 11 and the gas analyzer 12, the air inlet of the particle filter 13 is connected to the air outlet of the first air pump 11 through the pipeline, and the air outlet is connected to the gas analyzer 12 through the pipeline;

[0091] The particle filter 13 is used to filter the particles in the pipeline gas. Considering that all filters have filtering efficiency issues, multi-stage filtering is implemented in combination with the pre-filter device 5 at the previous stage to ensure the filtering effect and the gas detection accuracy of the gas analyzer 12.

[0092] In one possible implementation, refer to Figure 4 , the gas analysis device 1 further comprises a membrane filter 15;

[0093] The membrane filter 15 is disposed on the pipeline between the first vacuum pump 11 and the gas analyzer 12 and is used to filter dust particles in the pipeline gas.

[0094] In one possible implementation, refer to Figure 4 , the gas analysis device 1 further includes a flow meter 16;

[0095] The flow meter 16 is disposed on the pipeline between the first vacuum pump 11 and the gas analyzer 12 to limit the flow of pipeline gas.

[0096] In one possible implementation, refer to Figure 2 and Figure 4 The system further comprises two calibration devices 7 and two calibration gas switching devices 8; the calibration gas switching devices 8 are connected one-to-one with the calibration devices 7, and the calibration gas switching devices 8 are also connected one-to-one with the gas analysis devices 1;

[0097] The calibration device 7 includes a plurality of standard gas storage devices, each of which stores a type of standard gas, and the gas outlet of each standard gas storage device is connected to the gas inlet of the standard gas switching device 8 through a pipeline, and the gas outlet of the standard gas switching device 8 is connected to the gas analysis device 1 through a pipeline;

[0098] The standard gas switching device 8 is used to control the introduction of standard gas into the gas analysis device 1 to calibrate the gas analysis device 1 .

[0099] Therefore, the calibration device 7 is connected to the gas analysis device 1 through the standard gas switching device 8. Different types of standard gases in the calibration device 7 can be passed through the standard gas switching device 8 and introduced into the gas analysis device 1 to calibrate the gas analysis device 1, thereby ensuring the gas detection accuracy of the gas analysis device 1.

[0100] In one possible implementation, refer to Figure 4 , the gas analysis device 1 further comprises a third three-way solenoid valve 17, and the standard gas switching device 8 comprises a switching valve 81;

[0101] The third three-way solenoid valve 17 is connected to the pipeline between the first air pump 11 and the gas analyzer 12; the air outlets of each calibration gas storage device in the calibration device 7 are connected to different air inlets of the switching valve 81 through pipelines; the air outlet of the switching valve 81 is connected to the second air inlet of the third three-way solenoid valve 17 through pipelines.

[0102] Those skilled in the art can understand that the switching valve 81 is used to switch the type of standard gas introduced into the gas analyzer 12 , and the third three-way solenoid valve 17 is used to control the introduction of standard gas or the introduction of gas sampled from the sampling device 3 .

[0103] In one possible implementation, refer to Figure 2 A manual control device 9 is also provided on the pipeline between the sampling device 3 and the gas delivery device 4; Figure 5 , the manual control device 9 includes a manual ball valve 91;

[0104] The manual control device 9 is used for the staff to manually control the on and off of the pipeline.

[0105] In one possible implementation, refer to Figure 5 The sampling device 3 and the manual control device 9 are connected via a heating pipeline.

[0106] In one possible implementation, refer to Figure 5 , the sampling device 3 also includes a fifth two-way solenoid valve 31, a sixth two-way solenoid valve 32 and a seventh two-way solenoid valve 33;

[0107] The fifth two-way solenoid valve 31 is arranged on the main pipeline of the sampling device 3, and is used to control the gas transmission between the sampling device 3 and the gas delivery device 4; the sixth two-way solenoid valve 32 is used to control the introduction of high-pressure nitrogen into the sampling device 3, and blow it out through the seventh two-way solenoid valve 33, so as to realize backblowing of the sampling device 3 and clean the pipeline of the sampling device 3.

[0108] In a possible implementation, the sampling device 3 further includes a heating device, and the heating device is used to heat the gas extracted by the sampling device 3 .

[0109] Those skilled in the art will appreciate that the various valves such as the two-way solenoid valve, three-way solenoid valve, needle valve, etc. used in the embodiments of the present application can be controlled by a controller, an MCU with analytical control functions, or manually to control the conductance of the air inlet and outlet, which will not be elaborated here.

[0110] The present application provides a gas circulation detection method, which is applied to the multi-sampling point gas detection system described in the above embodiment. The gas circulation detection method includes the following steps:

[0111] The two gas analysis devices 1 are named as the first gas analysis device and the second gas analysis device respectively; the multiple sampling devices 3 are named as the first sampling device, the second sampling device, the third sampling device, ... the nth sampling device respectively;

[0112] According to the set detection rules, the first gas analysis device and the second gas analysis device are used to perform cyclic detection on the gases sampled by the first sampling device to the nth sampling device.

[0113] In one possible implementation, refer to Figure 6 , the detection rule comprises the following steps:

[0114] S1, at the detection time t1, the connection path between the first sampling device and the first gas analysis device, the connection path between the second sampling device and the second gas analysis device, and the connection path between other sampling devices and the exhaust device 2 are respectively opened; the first gas analysis device detects the gas sampled by the first sampling device, the second gas analysis device detects the gas sampled by the second sampling device, and the gas of other sampling devices is discharged through the exhaust device 2;

[0115] It can be understood by those skilled in the art that the other sampling devices mentioned in this step are the other sampling devices in the sampling device 3 except the first sampling device and the second sampling device;

[0116] Specifically, the gas sampled by the first sampling device passes through the second gas outlet of the first three-way solenoid valve 41 and the second gas outlet of the second three-way solenoid valve 42 in the first gas delivery device in sequence, and then enters the first gas analysis device, wherein the first gas delivery device is the gas delivery device 4 correspondingly connected to the first sampling device; similarly, the gas sampled by the second sampling device passes through the second gas outlet of the first three-way solenoid valve 41 and the first gas outlet of the second three-way solenoid valve 42 in the second gas delivery device in sequence, and then enters the second gas analysis device, wherein the second gas delivery device is the gas delivery device 4 correspondingly connected to the second sampling device; for other sampling devices, that is, the third sampling device to the nth sampling device, the gas sampled by the sampling device passes through the first gas outlet of the first three-way solenoid valve 41 in the gas delivery device 4 connected to the sampling device, and then enters the exhaust device 2.

[0117] S2, at the detection time t2, the connection passages between the second sampling device and the first gas analysis device, the connection passages between the third sampling device and the second gas analysis device, and the connection passages between other sampling devices and the exhaust device 2 are respectively opened, so that the first gas analysis device detects the gas sampled by the second sampling device, the second gas analysis device detects the gas sampled by the third sampling device, and the gas from other sampling devices is discharged through the exhaust device 2;

[0118] Those skilled in the art can understand that the other sampling devices mentioned in this step are the other sampling devices in the sampling device 3 except the second sampling device and the third sampling device;

[0119] In this process, for the control of corresponding solenoid valves in different connection paths, those skilled in the art may refer to the above description, which will not be repeated here.

[0120] S3, at the detection time t3, the connection passage between the third sampling device and the first gas analysis device, the connection passage between the fourth sampling device and the second gas analysis device, and the connection passage between the other sampling devices and the exhaust device 2 are respectively opened, so that the first gas analysis device detects the gas sampled by the third sampling device, the second gas analysis device detects the gas sampled by the fourth sampling device, and the gas of the other sampling devices is discharged through the exhaust device 2;

[0121] Those skilled in the art can understand that the other sampling devices mentioned in this step are the other sampling devices in the sampling device 3 except the third sampling device and the fourth sampling device.

[0122] S4, referring to step S1-step S3, traverse the first sampling device to the nth sampling device until at the detection time tn, respectively open the connection path between the nth sampling device and the first gas analysis device, the connection path between the first sampling device and the second gas analysis device, and the connection path between other sampling devices and the exhaust device 2, so that the first gas analysis device detects the gas sampled by the nth sampling device, the second gas analysis device detects the gas sampled by the first sampling device, and the gas of other sampling devices is discharged through the exhaust device 2, completing a gas cycle detection;

[0123] Those skilled in the art can understand that the other sampling devices mentioned in this step are the other sampling devices in the sampling device 3 except the nth sampling device and the first sampling device.

[0124] The above-mentioned gas circulation detection method detects the concentration of multiple sampling points in turn through two gas analysis devices, which can not only realize continuous detection in a single-point sampling method similar to a "one-to-one" system, but also detect the gas output by the same sampling device 3 through two gas analysis devices, thus avoiding the problem of detection interruption and inaccurate data caused by a problem of a certain instrument itself.

[0125] Optionally, the intervals between the detection moments are the same, for example, 5 minutes. Then, according to the detection method of the present application, the process of detecting the gas can refer to Table 1 to obtain the gas sources corresponding to the first gas analysis device, the second gas analysis device and the exhaust device at different times:

[0126] Table 1

[0127] ,

[0128] According to Table 1, it can be obtained that within the time of 5*(n-1), the first gas analysis device and the second gas analysis device complete a cycle detection of the gas from the first sampling device to the nth sampling device.

[0129] For ease of understanding, referring to Table 2, when the number of sampling devices 3 in the system is set to three, the gas sources corresponding to the first gas analysis device, the second gas analysis device and the exhaust device at different times are specifically described:

[0130] Table 2

[0131] ,

[0132] That is to say, after completing one gas circulation detection of the three sampling devices at 10 minutes, the system still keeps detecting the gas sampled by each sampling device according to the same detection sequence.

[0133] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-sampling point gas detection system, characterized in that: The invention comprises two gas analysis devices (1), an exhaust device (2), a plurality of sampling devices (3) and a plurality of gas delivery devices (4); the sampling devices (3) and the gas delivery devices (4) are connected in a one-to-one correspondence via pipelines; The sampling device (3) is used to sample the gas at the corresponding sampling point, and the gas outlet of the sampling device (3) is connected to the gas inlet of the corresponding gas delivery device (4) through a pipeline; the first gas outlet of each gas delivery device (4) is connected to the exhaust device (2) through a pipeline, the second gas outlet of each gas delivery device (4) is connected to one of the gas analysis devices (1) through a pipeline, and the third gas outlet of each gas delivery device (4) is connected to another gas analysis device (1) through a pipeline; The gas analysis device (1) comprises a first air pump (11) and a gas analyzer (12) connected in sequence through a pipeline, and also comprises a second needle valve (18); the exhaust device (2) comprises a second air pump (21); the gas delivery device (4) comprises a first three-way solenoid valve (41) and a second three-way solenoid valve (42), and also comprises a second two-way solenoid valve (43), a third two-way solenoid valve (44) and a fourth two-way solenoid valve (45); The air outlet of the sampling device (3) is connected to the air inlet of the first three-way solenoid valve (41) through a pipeline, and the first air outlet of the first three-way solenoid valve (41) is connected to the air inlet of the exhaust device (2) through a pipeline; The second gas outlet of the first three-way solenoid valve (41) is connected to the gas inlet of the second three-way solenoid valve (42) through a pipeline, the first gas outlet of the second three-way solenoid valve (42) is connected to the gas inlet of one of the gas analysis devices (1) through a pipeline, and the second gas outlet of the second three-way solenoid valve (42) is connected to the gas inlet of another gas analysis device (1) through a pipeline; The second two-way solenoid valve (43) is connected to a pipeline between the first air outlet of the first three-way solenoid valve (41) and the exhaust device (2); The third two-way solenoid valve (44) is connected to a pipeline between the first gas outlet of the second three-way solenoid valve (42) and the corresponding gas analysis device (1); The fourth two-way solenoid valve (45) is connected to a pipeline between the second gas outlet of the second three-way solenoid valve (42) and the corresponding gas analysis device (1); The second needle valve (18) is connected to both ends of the first air pump (11).

2. The multi-sampling point gas detection system according to claim 1, characterized in that: It also includes a plurality of pre-filtering devices (5); the pre-filtering devices (5) are connected to the pipeline between the sampling device (3) and the gas delivery device (4); The pre-filter device (5) comprises a first filter (51) and a first drainage pump (52); the air inlet of the first filter (51) is connected to the sampling device (3) through a pipeline, the air outlet is connected to the air inlet of the gas delivery device (4) through a pipeline, and the liquid discharge port is connected to the liquid inlet of the first drainage pump (52) through a pipeline; The pre-filter device (5) is used to filter moisture and impurities in the pipeline gas.

3. The multi-sampling point gas detection system according to claim 1, characterized in that: It also includes a plurality of condensing devices (6); the condensing devices (6) are connected to the gas inlet end of the gas analysis device (1) and the gas inlet end of the exhaust device (2) in a one-to-one correspondence through pipelines; The condensing device (6) comprises a condenser (61) and a second drainage pump (62); the condenser (61) is used to condense moisture in the pipeline gas and discharge the moisture through the second drainage pump (62).

4. The multi-sampling point gas detection system according to claim 1, characterized in that: The gas analysis device (1) further comprises a first needle valve (14); One end of the first needle valve (14) is connected to the pipeline between the first vacuum pump (11) and the gas analyzer (12), and the first needle valve (14) is used to discharge excess gas from the outlet of the first vacuum pump (11) and control the flow rate entering the gas analyzer (12).

5. The multi-sampling point gas detection system according to claim 1, characterized in that: It also includes two calibration devices (7) and two calibration gas switching devices (8); the calibration gas switching devices (8) are connected to the calibration devices (7) in a one-to-one correspondence, and the calibration gas switching devices (8) are also connected to the gas analysis devices (1) in a one-to-one correspondence; The calibration device (7) comprises a plurality of standard gas storage devices, each of which stores a type of standard gas, and the gas outlet of each standard gas storage device is connected to the gas inlet of the standard gas switching device (8) through a pipeline, and the gas outlet of the standard gas switching device (8) is connected to the gas analysis device (1) through a pipeline; The standard gas switching device (8) is used to control the introduction of standard gas into the gas analysis device (1) to calibrate the gas analysis device (1).

6. The multi-sampling point gas detection system according to claim 5, characterized in that: The gas analysis device (1) further comprises a third three-way solenoid valve (17), and the standard gas switching device (8) comprises a switching valve (81); The third three-way solenoid valve (17) is connected to the pipeline between the first air pump (11) and the gas analyzer (12); the gas outlets of each calibration gas storage device in the calibration device (7) are connected to different gas inlets of the switching valve (81) through pipelines; and the gas outlet of the switching valve (81) is connected to the second gas inlet of the third three-way solenoid valve (17) through a pipeline.

7. A gas circulation detection method, applied to the multi-sampling point gas detection system according to any one of claims 1 to 6, characterized in that: The gas circulation detection method comprises: The two gas analysis devices (1) are respectively named as a first gas analysis device and a second gas analysis device; the plurality of sampling devices (3) are respectively named as a first sampling device, a second sampling device, a third sampling device, ... an nth sampling device; According to the set detection rules, the first gas analysis device and the second gas analysis device are used to perform cyclic detection on the gases sampled by the first sampling device to the nth sampling device.

8. The gas circulation detection method according to claim 7, characterized in that: The detection rules include: At the detection time t1, the connection passage between the first sampling device and the first gas analysis device, the connection passage between the second sampling device and the second gas analysis device, and the connection passage between the other sampling devices and the exhaust device (2) are respectively opened, so that the first gas analysis device detects the gas sampled by the first sampling device, the second gas analysis device detects the gas sampled by the second sampling device, and the gas of the other sampling devices is discharged through the exhaust device (2); At the detection time t2, the connection passage between the second sampling device and the first gas analysis device, the connection passage between the third sampling device and the second gas analysis device, and the connection passage between the other sampling devices and the exhaust device (2) are respectively opened, so that the first gas analysis device detects the gas sampled by the second sampling device, the second gas analysis device detects the gas sampled by the third sampling device, and the gas of the other sampling devices is discharged through the exhaust device (2); At the detection time t3, the connection path between the third sampling device and the first gas analysis device, the connection path between the fourth sampling device and the second gas analysis device, and the connection path between the other sampling devices and the exhaust device (2) are respectively opened, so that the first gas analysis device detects the gas sampled by the third sampling device, the second gas analysis device detects the gas sampled by the fourth sampling device, and the gas of the other sampling devices is discharged through the exhaust device (2); The method traverses the first sampling device to the nth sampling device until, at the detection time tn, the connection path between the nth sampling device and the first gas analysis device, the connection path between the first sampling device and the second gas analysis device, and the connection path between the other sampling devices and the exhaust device (2) are respectively opened, so that the first gas analysis device detects the gas sampled by the nth sampling device, the second gas analysis device detects the gas sampled by the first sampling device, and the gas from the other sampling devices is discharged through the exhaust device (2), thereby completing a gas cycle detection.

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