Method for detecting residual harmful gas protection capability of carbon layer based on built-in sampling gas path

Abstract

This invention discloses a device and method for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path. The adsorption unit of the device includes N sampling probes, which are used to sample the gas in the area where the probe is located. Each probe is located at a different carbon layer depth, enabling the measurement of the atmosphere concentration at different carbon layer depths. The adsorption carbon zero gas module is used to perform zero-point calibration of the detection module, so that the detection module can obtain a stable relative baseline value at the beginning of each detection cycle. The sampling gas path control module is used to control each gas path and the adsorbed carbon zero gas module to periodically form a path with the detection module, so as to realize the cyclic detection of the atmosphere concentration at different carbon layer depths. The detection module is used to detect the atmosphere concentration at different carbon layer depths, thereby forming a fitting curve to lay the foundation for subsequent calculations, improving testing efficiency and sensor reliability.

Description

Technical Field

[0001] This invention belongs to the field of target gas detection technology, and specifically relates to a device and method for detecting the residual protective capability of carbon layers based on a built-in sampling gas path. Background Technology

[0002] In recent years, incidents of poisoning by hazardous gases among factory workers have occurred frequently. While proper personal protective equipment is essential, the filtration efficiency of the surrounding environment also needs to be strictly controlled. Although large-scale gas filter canisters currently possess excellent filtration capabilities for hazardous gases in open spaces, the protective performance of the adsorption layer gradually decreases with continuous use, eventually reaching a threshold and being penetrated.

[0003] Currently, there are built-in probe detection methods, where the sensor is directly inserted into the protective layer to detect the atmospheric concentration in the current area. However, this method has some drawbacks. When inserted into the protective layer for a long time, the sensor needs to be heated for a period of time before it starts working to remove impurities adsorbed on the surface due to the influence of the environment. This results in an excessively long warm-up time, which affects the adaptability of the sensor in practical applications. At the same time, the zero point of the metal oxide semiconductor sensor itself drifts due to the influence of environmental factors such as temperature. In the built-in detection mode, the zero point cannot be determined, leading to inaccurate detection results. Therefore, there is an urgent need to develop a detection device that can solve the above-mentioned problems. A detection method is proposed for detecting the remaining filtration capacity of a filter. Summary of the Invention

[0004] This invention provides a device and method for detecting the remaining protective capability of a carbon layer based on a built-in sampling gas path. The zero point is determined by sampling, and an external sensor is used to avoid excessive impurity adsorption within the sensor, thereby shortening the preheating time.

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] This invention provides a device for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, comprising an adsorption unit, a filtration unit, a sampling gas path control module, a carbon adsorption zero-gas module, and a detection module. The adsorption unit contains a carbon layer, and the filtration unit is connected to the adsorption unit. The adsorption unit includes N sampling probes, which are connected to the sampling gas path control module via N gas paths, where N is a positive integer ≥ 1. The carbon adsorption zero-gas module is connected to the sampling gas path control module via a zero-gas path, and the sampling gas path control module is connected to the detection module.

[0007] N sampling probes are used to sample the gas in the area where the probes are located. Each probe is located at a different carbon layer depth, enabling the measurement of the atmosphere concentration at different carbon layer depths. The adsorbed carbon zero gas module is used to perform zero-point calibration of the detection module, so that the detection module can obtain a stable relative baseline value at the beginning of each detection cycle. The sampling gas path control module is used to control each gas path and the adsorbed carbon zero gas module to periodically form a path with the detection module, so as to realize the cyclic detection of the atmosphere concentration at different carbon layer depths. The detection module is used to detect the atmosphere concentration at different carbon layer depths, thereby forming a fitting curve to lay the foundation for subsequent calculations.

[0008] In an optional embodiment of the present invention, the detection module includes an air pump, a failure warning chip chamber, a power supply module, and a working status indicator module. The failure warning chip chamber is connected to the sampling gas path control module through an air inlet, and is connected to the air pump through a gas path. The power supply module supplies power to the air pump, the failure warning chip chamber, and the working status indicator module. The air pump is used to rapidly extract sampling gas, the failure warning chip in the failure warning chip chamber provides a stable detection environment, and the working status indicator module visualizes the detection status of the device.

[0009] In an optional embodiment of the present invention, the sampling gas path control module includes a switch control module and a gas path switching valve. N sampling probes are connected to the gas path switching valve through N gas paths. The gas path switching valve is connected to the detection module through a gas path. The switch control module is used to open or close the gas path switching valve.

[0010] In one optional embodiment of the present invention, N sampling probes are 6 sampling probes and N gas paths are 6 gas paths; the first to sixth sampling probes are respectively connected to the sampling gas path control module through the first to sixth gas paths.

[0011] In an optional embodiment of the present invention, the gas path switching valve includes first to sixth cut-off solenoids and first to sixth three-way connectors; a first sampling probe is connected to the first three-way connector via the first cut-off solenoid, a second sampling probe is connected to the first three-way connector via the second cut-off solenoid, a third sampling probe is connected to the second three-way connector via the third cut-off solenoid, a fourth sampling probe is connected to the second three-way connector via the fourth cut-off solenoid, a fifth sampling probe is connected to the third three-way connector via the fifth cut-off solenoid, and a sixth sampling probe is connected to the third three-way connector via the sixth cut-off solenoid; the adsorbed carbon zero gas module is connected to the fifth three-way connector via a seventh cut-off solenoid.

[0012] The first and second tee connectors are connected to the sixth tee connector via the fourth tee connector, the third tee connector is connected to the sixth tee connector via the fifth tee connector, and the sixth tee connector is connected to the detection module.

[0013] In an optional embodiment of the present invention, the switch control module is used to turn on or off the first to sixth cut-off electromagnetics, which are a channel rotary switching valve, an external pilot-operated pneumatic control valve, and an air switching valve.

[0014] This invention also provides a method for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, implemented using the apparatus for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path described in the above embodiments, and including the following steps:

[0015] Step 1: First, install the sampling probe in the adsorption unit, then install the carbon layer in the adsorption unit, and then connect the sampling gas path control module and detection module to each sampling probe. Turn on the device switch to start working.

[0016] Step 2: The sampling gas path control module turns on the switch of the zero gas path. The gas pump in the detection module draws gas from the adsorbed carbon zero gas module. The gas enters the failure warning chip chamber in the detection module to perform zero-point calibration on the failure warning chip. After 10 seconds of evacuation, the sampling gas path control module controls the zero gas path to close.

[0017] Step 3: The sampling gas path control module turns on the switch of the sixth gas path. The gas pump in the detection module draws gas from the carbon layer area where the sixth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the sixth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0018] Step 4: The sampling gas path control module turns on the switch of the fifth gas path. The gas pump in the detection module draws gas from the carbon layer area where the fifth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of evacuation, the sampling gas path control module controls the fifth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0019] Step 5: The sampling gas path control module turns on the switch of the fourth gas path. The gas pump in the detection module draws gas from the carbon layer area where the fourth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the fourth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0020] Step 6: The sampling gas path control module turns on the switch of the third gas path. The gas pump in the detection module draws gas from the carbon layer area where the third sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the third gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0021] Step 7: The sampling gas path control module turns on the switch of the second gas path. The gas pump in the detection module draws gas from the carbon layer area where the second sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the second gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0022] Step 8: The sampling gas path control module turns on the switch of the first gas path. The gas pump in the detection module draws gas from the carbon layer area where the first sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the first gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0023] Step 9: Repeat steps 2 to 8. The detection module will summarize the atmosphere concentration of each step to obtain a concentration fitting curve.

[0024] In one optional embodiment of the present invention, the types of gases detected by the failure warning chip include ammonia, hydrogen sulfide, and benzene compounds, and the concentration range of the detected gases includes ppb level, ppm level, and percentage level.

[0025] Compared with existing technologies, the embodiments of the present invention provide a device and method for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, which has the following beneficial effects: The probe scheme of the present invention is less expensive than the built-in probe scheme because the external probe first installs the purely structural gas path into the filter absorber before loading carbon, while the insertion detection would destroy the uniformity of the carbon layer, so it has good applicability to the filter absorber; In the external scheme, the difference between each gas path is reflected by detecting the difference in the detection signal, so the detection can start without waiting for the sensor to preheat and stabilize, and no absolute baseline value is required, thus having better detection capability at the penetration start time; The external probe can avoid the problem of the front sensor adsorbing a large number of harmful gas molecules due to prolonged insertion into the protective layer, thus prolonging the sensor's response time, which greatly improves the testing efficiency and sensor reliability; The external scheme only requires a single sensor, and the probability of failure is much lower than the probability of failure of a multi-sensor probe. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a device for detecting the remaining protective capability of a carbon layer based on a built-in sampling gas path, provided in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of a detection module for a device based on a built-in sampling gas path for detecting the residual protective capability of a carbon layer, as provided in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the sampling gas path control module of a device for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, provided in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of a device for detecting the remaining protective capability of a carbon layer based on six built-in sampling gas paths, provided as an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of a sampling gas path control module for a device that detects the remaining protective capability of a carbon layer based on six built-in sampling gas paths, as provided in an embodiment of this application.

[0032] Figure 6 This is a flowchart illustrating a method for detecting the remaining protective capability of a carbon layer based on a built-in sampling gas path, as provided in an embodiment of this application.

[0033] Figure 7 The raw data of the detection results of a device for detecting the residual protective capability of carbon layer based on a built-in sampling gas path, provided in the embodiments of this application.

[0034] Figure 8 The detection result fitting curve is provided for an embodiment of this application of a device for detecting the residual protective capability of the carbon layer based on a built-in sampling gas path. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] like Figure 1As shown, this embodiment of the invention provides a device for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, including an adsorption unit, a filtration unit, a sampling gas path control module, a carbon adsorption zero-gas module, and a detection module; the adsorption unit has a carbon layer installed inside, the filtration unit is connected to the adsorption unit, the adsorption unit includes N sampling probes, the N sampling probes are connected to the sampling gas path control module through N gas paths, where N is a positive integer ≥ 1; the carbon adsorption zero-gas module is connected to the sampling gas path control module through a zero-gas path, and the sampling gas path control module is connected to the detection module.

[0037] N sampling probes are used to sample the gas in the area where the probes are located. Each probe is located at a different carbon layer depth, enabling the measurement of the atmosphere concentration at different carbon layer depths. The adsorbed carbon zero gas module is used to perform zero-point calibration of the detection module, so that the detection module can obtain a stable relative baseline value at the beginning of each detection cycle. The sampling gas path control module is used to control each gas path and the adsorbed carbon zero gas module to periodically form a path with the detection module, so as to realize the cyclic detection of the atmosphere concentration at different carbon layer depths. The detection module is used to detect the atmosphere concentration at different carbon layer depths, thereby forming a fitting curve to lay the foundation for subsequent calculations.

[0038] like Figure 2 As shown, the detection module includes an air pump, a failure warning chip chamber, a power supply module, and a working status indicator module. The failure warning chip chamber is connected to the sampling gas path control module via an air inlet and to the air pump via a gas path. The power supply module provides power to the air pump, the failure warning chip chamber, and the working status indicator module. The air pump is used to quickly extract the sampling gas, the failure warning chip in the failure warning chip chamber provides a stable detection environment, and the working status indicator module visualizes the current detection status of the device. The types of gases detected by the failure warning chip include ammonia, hydrogen sulfide, and benzene compounds, and the detected gas concentration range includes ppb, ppm, and percentage levels.

[0039] like Figure 3 As shown, the sampling gas path control module includes a switch control module and a gas path switching valve. N sampling probes are connected to the gas path switching valve through N gas paths. The gas path switching valve is connected to the detection module through a gas path. The switch control module is used to open or close the gas path switching valve.

[0040] Figure 4 Combination Figure 1 There are 6 sampling probes for N sampling probes and 6 gas paths for N gas paths; the first to sixth sampling probes are connected to the sampling gas path control module through the first to sixth gas paths respectively.

[0041] Figure 5 Combination Figure 4 and Figure 3 The gas path switching valve includes first to sixth cut-off solenoids and first to sixth three-way connectors; a first sampling probe is connected to the first three-way connector via the first cut-off solenoid, a second sampling probe is connected to the first three-way connector via the second cut-off solenoid, a third sampling probe is connected to the second three-way connector via the third cut-off solenoid, a fourth sampling probe is connected to the second three-way connector via the fourth cut-off solenoid, a fifth sampling probe is connected to the third three-way connector via the fifth cut-off solenoid, and a sixth sampling probe is connected to the third three-way connector via the sixth cut-off solenoid; the adsorbed carbon zero gas module is connected to the fifth three-way connector via the seventh cut-off solenoid; the first and second three-way connectors are connected to the sixth three-way connector via the fourth three-way connector, the third three-way connector is connected to the sixth three-way connector via the fifth three-way connector, and the sixth three-way connector is connected to the detection module.

[0042] The switch control module is used to turn on or off the first to sixth cut-off electromagnetics, which are a channel rotary switching valve, an external pilot-operated pneumatic control valve, and an air switching valve.

[0043] The working process of the device of the present invention is as follows: First, a carbon layer is installed on the adsorption unit, the zero gas path is opened, and the gas in the adsorption carbon zero gas module is extracted by pumping. The detection module is zero-point calibrated. After 10 seconds of evacuation, the sampling gas path control module controls the zero gas path to close. Then, the sampling gas path control switch controls the gas path N to open. The gas in the adsorption unit is extracted by pumping. The gas enters the detection module for detection. After 10 seconds of evacuation, the sampling gas path control module controls the gas path N to close. Then, the same working method is used until all sampling probes have collected data. Finally, based on the atmospheric concentration obtained from the above gas paths, a concentration fitting curve is obtained.

[0044] The device in this embodiment is as follows: Figure 4 and Figure 5 As shown, six sampling probes and an adsorbed carbon zero-gas module are connected to corresponding shut-off solenoid valves. A switch control module is used to regulate each shut-off solenoid valve, thereby achieving the effect of periodically and automatically switching between different gas paths. The other ends of each shut-off solenoid valve are then connected using multi-stage tee connectors to achieve multi-port input and single-port output, allowing sample gases from different sampling gas paths to be introduced into the detection module through a single gas path.

[0045] like Figure 6 As shown, this embodiment of the invention provides a method for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path. This method is implemented using a device with six built-in sampling gas paths, and includes the following steps:

[0046] Step 1: First, install the sampling probe in the adsorption unit, install the carbon layer in the adsorption unit, then connect the sampling gas path control module and the detection module to each sampling probe, and turn on the device switch to start working.

[0047] Step 2: The sampling gas path control module turns on the switch of the zero gas path. The gas pump in the detection module draws gas from the adsorbed carbon zero gas module. The gas enters the failure warning chip chamber in the detection module to perform zero-point calibration on the failure warning chip. After 10 seconds of evacuation, the sampling gas path control module controls the zero gas path to close.

[0048] Step 3: The sampling gas path control module turns on the switch of the sixth gas path. The gas pump in the detection module draws gas from the carbon layer area where the sixth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the sixth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0049] Step 4: The sampling gas path control module turns on the switch of the fifth gas path. The gas pump in the detection module draws gas from the carbon layer area where the fifth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of evacuation, the sampling gas path control module controls the fifth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0050] Step 5: The sampling gas path control module turns on the switch of the fourth gas path. The gas pump in the detection module draws gas from the carbon layer area where the fourth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the fourth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0051] Step 6: The sampling gas path control module turns on the switch of the third gas path. The gas pump in the detection module draws gas from the carbon layer area where the third sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the third gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0052] Step 7: The sampling gas path control module turns on the switch of the second gas path. The gas pump in the detection module draws gas from the carbon layer area where the second sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the second gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0053] Step 8: The sampling gas path control module turns on the switch of the first gas path. The gas pump in the detection module draws gas from the carbon layer area where the first sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the first gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth.

[0054] Step 9: Repeat steps 2 to 8. The detection module will summarize the atmosphere concentration of each step to obtain a concentration fitting curve.

[0055] Preferably, the types of gases detected by the failure warning chip include ammonia, hydrogen sulfide, and benzene compounds, and the concentration range of the detected gases includes ppb level, ppm level, and percentage level.

[0056] Based on the above steps, take one period of resistance data as follows: Figure 7 As shown, R0 represents the resistance change after gas is extracted from gas path 7, R6 represents the resistance change after gas is extracted from gas path 6, R5 represents the resistance change after gas is extracted from gas path 5, R4 represents the resistance change after gas is extracted from gas path 4, R3 represents the resistance change after gas is extracted from gas path 3, R2 represents the resistance change after gas is extracted from gas path 2, and R1 represents the resistance change after gas is extracted from gas path 1. Based on the resistance changes, the fitting curve of the current carbon layer atmosphere concentration versus carbon layer depth is obtained as follows. Figure 8 As shown, the remaining protective capability of the carbon layer can be determined based on the current fitted curve.

[0057] Although the invention has been described with respect to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A device for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, characterized in that, The system includes an adsorption unit, a filtration unit, a sampling gas path control module, an adsorption carbon zero-gas module, and a detection module. The adsorption unit contains a carbon layer. The filtration unit is connected to the adsorption unit. The adsorption unit includes N sampling probes, which are connected to the sampling gas path control module via N gas paths, where N is a positive integer greater than 1. The adsorption carbon zero-gas module is connected to the sampling gas path control module via a zero-gas path, and the sampling gas path control module is connected to the detection module. N sampling probes are used to sample the gas in the area where the probe is located. Each probe is located at a different carbon layer depth, which can measure the atmosphere concentration at different carbon layer depths. The adsorbed carbon zero gas module is used to perform zero-point calibration of the detection module, so that the detection module can obtain a stable relative baseline value at the beginning of each detection cycle. The sampling gas path control module is used to control each gas path and the adsorbed carbon zero gas module to periodically form a path with the detection module, so as to realize the cyclic detection of the atmosphere concentration at different carbon layer depths; the detection module is used to detect the atmosphere concentration at different carbon layer depths, thereby forming a fitting curve to lay the foundation for subsequent calculations. The detection module includes an air pump, a failure warning chip chamber, a power supply module, and a working status indicator module. The failure warning chip chamber is connected to the sampling gas path control module through an air inlet, and is also connected to the air pump through a gas path. The power supply module provides power to the air pump, the failure warning chip chamber, and the working status indicator module. The air pump is used to quickly extract sampling gas, the failure warning chip in the failure warning chip chamber provides a stable detection environment, and the working status indicator module visualizes the detection status of the device.

2. The device for detecting the residual protective capability of the carbon layer based on a built-in sampling gas path according to claim 1, characterized in that, The sampling gas path control module includes a switch control module and a gas path switching valve. N sampling probes are connected to the gas path switching valve through N gas paths. The gas path switching valve is connected to the detection module through a gas path. The switch control module is used to open or close the gas path switching valve.

3. The device for detecting the residual protective capability of the carbon layer based on a built-in sampling gas path according to claim 2, characterized in that, N sampling probes are 6 sampling probes, and N gas paths are 6 gas paths; the first to sixth sampling probes are respectively connected to the sampling gas path control module through the first to sixth gas paths.

4. The device for detecting the residual protective capability of the carbon layer based on a built-in sampling gas path according to claim 3, characterized in that, The gas path switching valve includes first to sixth cut-off solenoids and first to sixth three-way connectors; the first sampling probe is connected to the first three-way connector via the first cut-off solenoid, the second sampling probe is connected to the first three-way connector via the second cut-off solenoid, the third sampling probe is connected to the second three-way connector via the third cut-off solenoid, the fourth sampling probe is connected to the second three-way connector via the fourth cut-off solenoid, the fifth sampling probe is connected to the third three-way connector via the fifth cut-off solenoid, and the sixth sampling probe is connected to the third three-way connector via the sixth cut-off solenoid; the adsorbed carbon zero gas module is connected to the fifth three-way connector via the seventh cut-off solenoid. The first and second tee connectors are connected to the sixth tee connector via the fourth tee connector, the third tee connector is connected to the sixth tee connector via the fifth tee connector, and the sixth tee connector is connected to the detection module.

5. The device for detecting the residual protective capability of the carbon layer based on a built-in sampling gas path according to claim 4, characterized in that, The switch control module is used to turn on or off the first to sixth cut-off electromagnetics, which are a channel rotary switching valve, an external pilot-operated pneumatic control valve, and an air switching valve.

6. A method for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path, implemented using the device for detecting the residual protective capability of a carbon layer based on a built-in sampling gas path as described in claim 5, characterized in that... Includes the following steps: Step 1: First, install the sampling probe in the adsorption unit, then install the carbon layer in the adsorption unit, and then connect the sampling gas path control module and detection module to each sampling probe. Turn on the device switch to start working. Step 2: The sampling gas path control module turns on the switch of the zero gas path. The gas pump in the detection module draws gas from the adsorbed carbon zero gas module. The gas enters the failure warning chip chamber in the detection module to perform zero-point calibration on the failure warning chip. After 10 seconds of evacuation, the sampling gas path control module controls the zero gas path to close. Step 3: The sampling gas path control module turns on the switch of the sixth gas path. The gas pump in the detection module draws gas from the carbon layer area where the sixth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the sixth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth. Step 4: The sampling gas path control module turns on the switch of the fifth gas path. The gas pump in the detection module draws gas from the carbon layer area where the fifth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of evacuation, the sampling gas path control module controls the fifth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth. Step 5: The sampling gas path control module turns on the switch of the fourth gas path. The gas pump in the detection module draws gas from the carbon layer area where the fourth sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the fourth gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth. Step 6: The sampling gas path control module turns on the switch of the third gas path. The gas pump in the detection module draws gas from the carbon layer area where the third sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the third gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth. Step 7: The sampling gas path control module turns on the switch of the second gas path. The gas pump in the detection module draws gas from the carbon layer area where the second sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the second gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth. Step 8: The sampling gas path control module turns on the switch of the first gas path. The gas pump in the detection module draws gas from the carbon layer area where the first sampling probe is located. The gas enters the failure warning chip chamber in the detection module. The failure warning chip detects the gas. After 10 seconds of gas evacuation, the sampling gas path control module controls the first gas path to close. The detection module obtains the atmosphere concentration at the current carbon layer depth. Step 9: Repeat steps 2 to 8. The detection module will summarize the atmosphere concentration of each step to obtain a concentration fitting curve.

7. The method for detecting the residual protective capability of the carbon layer based on a built-in sampling gas path according to claim 6, characterized in that, The failure warning chip detects gases including ammonia, hydrogen sulfide, and benzene compounds, and the detected gas concentration range includes ppb, ppm, and percentage levels.

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