Portable gas detector on-site quantitative detection device

Abstract

The utility model provides an on-site quantitative detection device for a portable gas detector. The on-site quantitative detection device comprises a main controller, an electric control gas source assembly, a miniature gas pool, a gas circulation assembly, a gas detection assembly and an open / closed loop dual-purpose gas detection assembly. The device can be used for mixing standard gases with different concentrations and different proportions, so that the device can be suitable for different types of gas detectors; and an open-loop and closed-loop dual-purpose detection gas circuit structure is adopted, so that the alarm response performance of the gas detector can be efficiently and quantitatively detected on site.

Description

Technical Field

[0001] The utility model relates to the field of quantitative detection of gas detectors, and in particular, to a portable on-site quantitative detection device for gas detectors. Background Technique

[0002] Combustible gas detectors are used to check for leaks of combustible gases in indoor and outdoor hazardous locations and are important instruments for ensuring production and personal safety. Gas detectors are widely used in places where combustible gases exist, such as petroleum, gas, chemical industry, oil depots, metallurgy, mines, and household kitchens, and these places can all become various combustible gas environments. Once these gases leak (accumulate / diffuse), it is very easy to cause combustion and explosion, posing a danger to people and equipment. In order to avoid terrible accidents, it is necessary to detect and alarm the concentration of the leaked (accumulated / diffused) combustible gas, and even drive a linkage device to automatically turn on the fan through the alarm point to eliminate the danger.

[0003] With the continuous expansion of market demand, the types and quantities of new products are also constantly increasing, and the awareness of people's property and life protection needs is constantly strengthening. As a result, the task of quality supervision of fire protection products is becoming increasingly heavy. In order to further strengthen the quality supervision and inspection of fire protection products in the use field, on the premise of ensuring the detection quality, how to simplify the test method and improve the detection efficiency plays an extremely important role in ensuring the inspection capabilities of production enterprises and fire protection supervision departments and improving the acceptance efficiency of fire protection supervision departments.

[0004] Currently, the common method for on-site detection of the action value of combustible gas detectors is to directly introduce a high-concentration standard gas into the combustible gas detector and observe whether it emits an alarm signal to determine whether it is qualified. However, this detection method can only roughly judge the alarm performance of detectors with different alarm points and cannot accurately measure the alarm action value of the detector, nor can it be compared with its set value.

[0005] There is a currently better detection method that uses on-site gas preparation and realizes an on-site detection device for the alarm performance of combustible gas detectors through an open-loop of a conduit and a detection probe. However, this device has disadvantages such as large volume, heavy weight, long gas preparation cycle, open gas path, and low detection efficiency. Content of the Utility Model

[0006] To solve the above problems, the present utility model provides a portable gas detector on-site quantitative detection device. The portable gas detector on-site quantitative detection device of the present utility model can meet the needs of on-site detection by the fire supervision department in the use field. Through the combination of a high-precision gas monitoring component and a closed-loop detection component to form a closed-loop control, it can automatically prepare corresponding gases with any set concentration within the range of 0-100% LEL according to different alarm action values of the gas detection component, accurately measure the alarm action value of the gas detector, and then determine the alarm performance of the on-site gas detector.

[0007] According to one aspect of the present invention, there is provided a portable gas detector on-site quantitative detection device, the detection device comprising: a main controller, an electronic control gas source assembly, a micro gas cell, a gas circulation assembly, a gas detection assembly, and an open / closed-loop dual-use gas detection assembly;

[0008] The main controller is communicatively connected to the gas detection assembly, the electronic control gas source assembly, and the gas circulation assembly, and is used to control the operation of the gas detection assembly, the electronic control gas source assembly, and the gas circulation assembly; the open / closed-loop dual-use gas detection assembly is hermetically connected to the gas detector to be tested;

[0009] The electronic control gas source assembly is used to introduce different types of detection gases or air into the micro gas cell at any different concentration through electronic control adjustment;

[0010] The gas circulation assembly is respectively connected to the micro gas cell and the gas detection assembly, and is used to circulate the detection gas between the micro gas cell and the gas detection assembly to form a closed-loop circuit;

[0011] The gas detection assembly is used to monitor in real time the concentration information of the detection gas in the micro gas cell, and send the concentration information of the detection gas to the main controller.

[0012] Optionally, the gas detection assembly includes a plurality of different types of gas sensing modules, so as to use the gas sensing modules to monitor in real time the concentration of the detection gas in the micro gas cell, and the main controller controls the electronic control gas source assembly to adjust and supply the detection gas.

[0013] Optionally, the main controller includes a single-chip microcomputer and a screen and a keyboard connected to the single-chip microcomputer.

[0014] Optionally, the detection gases include methane, propane, isobutane, hydrogen, or carbon monoxide.

[0015] Optionally, the concentration of the detection gas is 0-100% LEL.

[0016] The portable gas detector on-site quantitative detection device provided by the utility model has the following beneficial effects:

[0017] 1. The portable gas detector provided by the utility model can modulate standard gases of different concentrations and proportions on site, so it can be applied to on-site quantitative detection of gas detectors of different types and different alarm thresholds. Since a micro gas pool, a circulating detection gas circuit and an electronically controlled gas source component are used to achieve high-precision gas distribution, the detection setting of different alarm thresholds is achieved through electric distribution of pure gas or other high-concentration small gas cylinders. It has the advantages of easy use, small size and high efficiency. Compared with conventional detection, which requires carrying a large capacity of calibration gas and a larger mixed gas pool, each detection will discharge the gas of the entire detection gas circuit. The utility model effectively improves the detection efficiency, reduces the risk, and improves the overall environmental performance.

[0018] 2. The open-loop and closed-loop dual-purpose detection gas path structure can efficiently and quantitatively detect the alarm response performance of the gas detector on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the framework structure of a portable on-site quantitative detection device for a gas detector of the utility model;

[0021] Figure 2 This is a schematic diagram of an electrically controlled gas source of a portable on-site quantitative detection device of a gas detector of the utility model;

[0022] Figure 3 This is a schematic diagram of an open-loop and closed-loop dual-purpose detection gas circuit structure of the utility model, wherein 1 refers to the circulating gas circuit pipeline; 2 is the elastic closed structure of the circulating gas circuit. When 3 is not connected, the circulating gas circuit is sealed to the outside. When 3 is connected, the middle of the gas circuit is closed to ensure that the gas circuit enters from the air inlet of 3 and returns to the circulating gas circuit from the air outlet of 3; 3 refers to the sensor detection circulation component structure; 4 refers to the sensor detection sealing structure, and the structure can be selected according to different sensor structures for sealing adaptation;

[0023] Among them, 11-main controller, 12-electrically controlled gas source component, 13-micro gas cell, 14-gas detection component, 15-open / closed loop dual-purpose gas detection component, 16-gas circulation component. DETAILED DESCRIPTION

[0024] The embodiments of the present utility model will be described below in conjunction with the accompanying drawings. Those skilled in the art should understand that these embodiments are illustrative only and not restrictive.

[0025] Figure 1 It is a schematic structural diagram of a on-site quantitative detection device for a portable gas detector of the present utility model.

[0026] As Figure 1 shown, the embodiments of the present utility model provide a on-site quantitative detection device for a portable gas detector, including: a main controller 11, an electric control gas source assembly 12, a micro gas cell 13, a gas circulation assembly 16, a gas detection assembly 14, and an open / closed loop dual-purpose gas detection assembly 15.

[0027] The main controller 11 is control-connected to the gas detection assembly 14, the electric control gas source assembly 12, and the gas circulation assembly 16, and is used to control the operation of the gas detection assembly 14, the electric control gas source assembly 12, and the gas circulation assembly 16; the open / closed loop dual-purpose gas detection assembly 15 is hermetically connected to the detection part structure of the gas detector to be detected through sealing clamps with different structural configurations; optionally, the main controller 11 includes a single-chip microcomputer, a screen, and a keyboard connected to the single-chip microcomputer. The main controller 11 communicates with the gas detection assembly 14 and controls the operation of the electric control gas source assembly 12, the gas circulation assembly 16, etc.

[0028] As Figure 2 shown, the electric control gas source assembly 12 may include a detection gas cylinder 121, an air solenoid valve 122, and a detection gas cylinder solenoid valve 123 connected to the detection gas cylinder 121. The electric control gas source assembly 12 is used to introduce different types of detection gases or air into the micro gas cell 13 at any different concentrations and different gas volumes through electric control adjustment. Optionally, the detection gases in this embodiment may include methane, propane, isobutane, hydrogen, or carbon monoxide. The concentration of the detection gas is 0-100% LEL. In this embodiment, different concentrations of detection gases are jointly realized by the electric control gas source assembly 12, the micro gas cell 13, the gas circulation assembly 16, and the gas detection assembly 14. Combining Figure 2 it can be known that the gas detection assembly 14 collects and analyzes the concentration of the detection gas inside the circulation pipeline in real time. If the gas concentration is lower than the set value, the electric control gas source assembly 12 opens the detection gas cylinder solenoid valve 123 to supplement the pure detection gas, and realizes gas circulation and mixing through the micro gas cell 13 in combination with the gas circulation assembly 16 to ensure that the gas concentration meets the detection requirement concentration; if the gas concentration is higher than the set value, the electric control gas source assembly 12 opens the air solenoid valve 122 to supplement air, and realizes gas circulation and mixing through the micro gas cell 13 in combination with the gas circulation assembly 16 to ensure that the gas concentration meets the detection requirement concentration.

[0029] The gas circulation component 16 is respectively connected to the micro gas cell 13 and the gas detection component 14, and is used to circulate the detection gas between the micro gas cell 13 and the gas detection component 14 to form a closed-loop circuit. The gas circulation component 16 realizes the circulation of the detection gas in the pipeline and the gas detection end of the micro gas cell 13 and the gas detection component 14, ensuring that the gas concentrations in the pipeline and the gas detection end of the micro gas cell 13 and the gas detection component 14 are consistent.

[0030] The gas detection component 14 is used to monitor the concentration information of the detection gas in the micro gas cell 13 in real time and send the concentration information of the detection gas to the main controller 11. In this embodiment, the gas detection component 14 monitors the gas concentration in real time and sends the concentration information to the main controller 11; the implementation site of the gas detection end is hermetically connected to the detection sensing component of the gas detector to be detected on site, and forms a closed-loop circuit with the gas cell, the gas circulation component 16, and the gas detection component 14.

[0031] In some embodiments, the gas detection component 14 includes multiple different types of gas sensing modules to use the gas sensing modules to monitor the concentration of the detection gas in the micro gas cell 13 in real time, so that the main controller 11 controls the electronic control gas source component 12 to adjust the supply of the detection gas.

[0032] The on-site quantitative detection device of the portable gas detector in this embodiment tests the corresponding type of gas detector on site by mixing different types of standard gases with different proportion concentrations. The main controller 11 adjusts the supply of the detection gas by controlling the detection gas source component. The gas circulation component 16 is used to circulate the detection gas to fill the entire detection gas path space and reach the on-site detector to be detected, such as the detector installed on site. The electronic control gas source uses standard pure gas or high-concentration detection gas, and combines with the solenoid valve to realize the adjustment work of the electronic control gas source component 12. The gas detection component 14 uses different types of gas sensing modules to support the real-time monitoring of the gas concentration to determine whether the output gas concentration meets the set detection value. The embodiment of the present utility model matches different types of gas concentration alarm thresholds through the micro gas cell 13 combined with the internal gas concentration monitoring and dynamic control method of the pipeline, realizes the on-site quantitative detection of different types of gas detectors, and adopts an open-loop and closed-loop dual-use detection gas path structure to realize the efficient on-site quantitative detection of the alarm response performance of the gas detector.

[0033] First, determine the set value of the on-site detector. After determination, set the gas concentration and start the automatic gas mixing. The gas circulation component 16 starts to work. The open / closed-loop dual-use gas detection component 15 is in the closed-loop state, and the gas does not pass through the on-site detector but directly returns to the gas pool. When the gas detection component 14 detects that the current gas concentration is higher than the set value, open the air makeup valve, monitor the concentration in real time, and pre-close the air makeup valve according to the downward trend of the concentration to ensure that the gas concentration meets the positive deviation for detection. When the gas detection component 14 detects that the current gas concentration is lower than the set value, calculate the amount of gas to be supplemented according to the concentration deviation, determine the time to open the detection gas makeup valve in combination with the flow coefficient, and monitor the detection gas concentration in real time. Pre-close the detection gas makeup valve according to the upward trend of the concentration to ensure that the gas concentration meets the positive deviation for detection.

[0034] The detection method of the portable gas detector on-site quantitative detection device provided by the embodiment of the present invention includes:

[0035] Step S1, power on and initialize the detection device;

[0036] Step S2, set the set value of the corresponding gas concentration when the detector to be detected responds through the main controller 11, and connect the detector sealing component in the open / closed-loop dual-use gas detection component 15 to the gas detector to be detected;

[0037] Step S3, start the electric control gas source component 12, and the main controller 11 controls the detection gas to enter the micro gas pool 13 through the electric control gas source component 12;

[0038] Step S4, use the gas detection component 14 to monitor the concentration information of the detection gas in the micro gas pool 13, and send the concentration information of the detection gas to the main controller 11;

[0039] Step S5, when the main controller 11 determines that the concentration of the detection gas in the pipeline reaches the set value, maintain it for a certain time, and determine whether the corresponding response value of the gas detector to be detected meets the requirements. If it meets the requirements, it is determined that the response is normal. If it does not meet the requirements, it is determined that the response is abnormal, and it is recommended to replace or repair. Separate the circulation pipeline from the detector sealing component in the open / closed-loop dual-use gas detection component 15, keep the gas concentration in the pipeline unchanged, and perform the next detector response test.

[0040] Figure 3It is a schematic diagram of an open-loop and closed-loop dual-use detection gas path structure of the present utility model, where 1 refers to the circulating gas path pipeline; 2 is the elastic closed structure of the circulating gas path. When 3 is not connected, the circulating gas path is airtight externally. When 3 is connected, the middle of the gas path is closed to ensure that the gas enters from the air inlet of 3 and returns to the circulating gas path from the air outlet of 3; 3 refers to the sensor detection circulating component structure; 4 refers to the sensor detection sealing structure, and different structures can be selected according to different sensor structures for sealing adaptation.

[0041] The following is an illustration of the limit setting of the alarm set value through different embodiments.

[0042] Detected gases: methane, propane, isobutane, hydrogen, carbon monoxide

[0043] Alarm set value: The low-limit alarm set values of methane, propane, isobutane, and hydrogen should be between 5% LEL and 25% LEL. Currently, most of the products submitted for inspection have low-limit alarm action values set at 20% LEL and 25% LEL, and a few are also 10% LEL and 15% LEL. The high-limit alarm set value standard requires that it must be set at 50% LEL.

[0044] Alarm set value: The low-limit alarm set value of carbon monoxide should be at 150×10 -6 (volume fraction) - 300×10 -6 (volume fraction), currently most of the products submitted for inspection have low-limit alarm action values set at 150 -6 (volume fraction) ~ 200 -6 (volume fraction), and the high-limit alarm set value standard requires that it must be set at 500×10 -6 (volume fraction)

[0045] Detected gases: methane, propane, carbon monoxide

[0046] Alarm set value: The alarm set values of methane and propane should be between 5% LEL - 25% LEL. Currently, most of the products submitted for inspection have alarm action values set at 8% LEL - 10% LEL

[0047] The alarm set value of carbon monoxide should be at 150×10 -6 (volume fraction) - 300×10 -6 (volume fraction), currently most of the products submitted for inspection have alarm action values set at 150 -6 (volume fraction) ~ 200 -6 (volume fraction)

[0048] In order to combine with the current national standard on-site detection rules and guide personnel to on-site inspect the alarm performance of gas detectors in the use environment, the present utility model also provides a portable gas detector on-site quantitative detection method, which is simple, convenient, and has higher feasibility.

[0049] The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A portable gas detector on-site quantitative detection device, characterized in that: The detection device comprises: a main controller (11), an electrically controlled gas source component (12), a micro gas pool (13), a gas circulation component (16), a gas detection component (14) and an open / closed loop dual-purpose gas detection component (15); The main controller (11) is in communication connection with the gas detection component (14), the electric control gas source component (12), and the gas circulation component (16), and is used to control the operation of the gas detection component (14), the electric control gas source component (12), and the gas circulation component (16); the open / closed loop dual-purpose gas detection component (15) is sealedly connected to the gas detector to be detected; The electrically controlled gas source component (12) is used to allow different types of detection gases or air to enter the micro gas pool (13) at any different concentrations through electrical control adjustment; The gas circulation component (16) is connected to the micro gas pool (13) and the gas detection component (14) respectively, and is used to circulate the detection gas between the micro gas pool (13) and the gas detection component (14) to form a closed loop; The gas detection component (14) is used to monitor the concentration information of the detection gas in the micro gas pool (13) in real time, and send the concentration information of the detection gas to the main controller (11).

2. The portable gas detector on-site quantitative detection device according to claim 1, characterized in that: The gas detection component (14) comprises a plurality of gas sensor modules of different types, so as to utilize the gas sensor modules to monitor the concentration of the detection gas in the micro gas pool (13) in real time, so that the main controller (11) controls the electric-controlled gas source component (12) to adjust and supply the detection gas.

3. The portable gas detector on-site quantitative detection device according to claim 1, characterized in that: The main controller (11) comprises a single chip microcomputer and a screen and a keyboard connected to the single chip microcomputer.

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