Gas detection method and system, and computer-readable storage medium

Abstract

A gas detection method and system, and a computer-readable storage medium, wherein the method includes: receiving an acetic acid detection signal, wherein the acetic acid detection signal is used to characterize the concentration of the acetic acid gas component in the gas; receiving a first candidate detection signal and a second candidate detection signal, wherein the first candidate detection signal and the second candidate detection signal are both used to characterize the concentration of the target gas component in the gas, and the first candidate detection signal and the second candidate detection signal are respectively obtained from gas detection devices with different sensitivities to acetic acid; and selecting a preferred detection signal from the first candidate detection signal and the second candidate detection signal based on the acetic acid detection signal and displaying the selected detection signal. The disclosed solution can more reliably achieve gas detection that is resistant to acetic acid interference, especially improve the detection accuracy of the target gas component in complex gas environments.

Description

Technical Field

[0001] The present disclosure relates to the field of gas detection technology, and in particular to a gas detection method and system, and a computer-readable storage medium. Background Art

[0002] In the industrial sector, methane, due to its flammable and explosive properties, has long been a major risk factor for accidents in industries like coal mining and petrochemicals. Therefore, gas detection devices are used to monitor methane concentrations in industrial production environments, enabling timely detection of methane leaks and enabling preventive and remedial measures.

[0003] Currently, the main methods used for methane gas detection include carrier catalytic combustion, thermal conductivity, optical interferometry, and infrared absorption. Compared to other detection methods, infrared absorption offers advantages such as high reliability, high precision, good selectivity, resistance to poisoning, long life, minimal environmental impact, and independence from oxygen. Therefore, methane detectors utilizing infrared absorption (hereinafter referred to as infrared gas detection devices) possess unique advantages, are highly favored by users, and are increasingly being used.

[0004] With the implementation of the national standard "GB 15322.1-2019 Combustible Gas Detectors Part 1: Point-Type Combustible Gas Detectors for Industrial and Commercial Use" on November 1, 2020, it clarified that methane sensors must be immune to interference from acetic acid and ethanol gases. This requirement places higher demands on infrared gas detection devices, as the near-infrared spectrum of acetic acid and methane highly overlaps, making it difficult for infrared gas detectors to distinguish between the two substances. In other words, acetic acid interferes with methane detection in infrared gas detectors. Existing infrared gas detectors will display false alarms when acetic acid is present in the ambient gas.

[0005] Chinese patent application CN111982850A discloses a sensor array detection device and method for infrared methane interference resistance. This device utilizes the catalytic combustion sensor's lack of responsiveness to acetic acid to address the effects of acetic acid interference on the infrared methane sensor through combined detection with an infrared methane sensor and a catalytic combustion sensor. However, this dual-sensor combined detection solution only resists acetic acid interference in single-gas environments (e.g., environments containing only acetic acid or only methane). It performs poorly in complex gas environments, such as those containing both methane and acetic acid, and may even fail to resist acetic acid interference at all.

[0006] Therefore, the existing technology urgently needs a gas detection solution that can adapt to complex gas environments and resist acetic acid interference. Summary of the Invention

[0007] The technical problem solved by the present invention is how to more reliably realize gas detection that is resistant to acetic acid interference, especially to improve the detection accuracy of target gas in a complex gas environment.

[0008] To solve the above technical problems, an embodiment of the present invention provides a gas detection method, comprising: receiving an acetic acid detection signal, wherein the acetic acid detection signal is used to characterize the concentration of the acetic acid gas component in the gas; receiving a first candidate detection signal and a second candidate detection signal, wherein the first candidate detection signal and the second candidate detection signal are both used to characterize the concentration of the target gas component in the gas, and the first candidate detection signal and the second candidate detection signal are respectively obtained from gas detection devices with different sensitivities to acetic acid; according to the acetic acid detection signal, selecting a preferred detection signal from the first candidate detection signal and the second candidate detection signal and displaying it.

[0009] Optionally, the first candidate detection signal is obtained from a first gas detection device that is sensitive to acetic acid, and the second candidate detection signal is obtained from a second gas detection device that is insensitive to acetic acid. The selecting and displaying of a preferred detection signal from the first candidate detection signal and the second candidate detection signal based on the acetic acid detection signal includes: when the concentration value represented by the acetic acid detection signal is greater than a first preset threshold value, determining the second candidate detection signal as the preferred detection signal and displaying it; otherwise, determining the first candidate detection signal as the preferred detection signal and displaying it.

[0010] Optionally, the first gas detection device includes an infrared gas detection device, and / or the second gas detection device includes a catalytic combustion gas sensor.

[0011] Optionally, the first candidate detection signal is obtained from a first gas detection device that is sensitive to acetic acid, and the method further includes: when the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, restricting the acetic acid gas component in the gas from entering the first gas detection device.

[0012] Optionally, limiting the acetic acid gas component in the gas from entering the first gas detection device includes: filtering the gas entering the first gas detection device to remove the acetic acid gas component in the gas.

[0013] Optionally, the method further comprises: simultaneously displaying the preferred detection signal and the acetic acid detection signal.

[0014] In order to solve the above technical problems, an embodiment of the present invention also provides a gas detection system, including: a first gas detection device, used to detect the concentration of the target gas component in the gas and output a first candidate detection signal; a second gas detection device, used to detect the concentration of the target gas component in the gas and output a second candidate detection signal, wherein the first gas detection device and the second gas detection device have different sensitivities to acetic acid; an acetic acid gas detection device, used to detect the concentration of the acetic acid gas component in the gas and output an acetic acid detection signal; a control module, coupled to the first gas detection device, the second gas detection device and the acetic acid gas detection device respectively, the control module is used to receive the acetic acid detection signal, the first candidate detection signal and the second candidate detection signal, and according to the acetic acid detection signal, select a preferred detection signal from the first candidate detection signal and the second candidate detection signal; a display module, coupled to the control module, the display module is used to receive the preferred detection signal and display it.

[0015] Optionally, the sensitivity of the second gas detection device to acetic acid is lower than that of the first gas detection device to acetic acid; when the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, the control module determines the second candidate detection signal as the preferred detection signal and sends it to the display module; when the concentration value represented by the acetic acid detection signal is less than or equal to the first preset threshold, the control module determines the first candidate detection signal as the preferred detection signal and sends it to the display module.

[0016] Optionally, the first gas detection device includes: a main body, the main body having a gas chamber for accommodating gas and respectively opening a gas chamber inlet and a gas chamber outlet; a cover body, which is covered on the main body, the cover body having an air inlet and a gas outlet, the air inlet being connected to the gas chamber inlet, and the gas outlet being connected to the gas chamber outlet; an infrared gas sensor, used to detect the concentration of the target gas in the gas chamber and output the first candidate detection signal; an acetic acid insulating membrane, movable between a first position and a second position, the acetic acid insulating membrane at the first position at least covering the cross section of the air inlet section, and the acetic acid insulating membrane at the second position at least exposing the cross section of the air inlet section to limit acetic acid gas from entering the air chamber, and the air inlet section being used to form a gas flow path connecting the air chamber inlet and the air inlet.

[0017] Optionally, the first gas detection device further includes a driving mechanism, which is disposed within the cover and is used to drive the acetic acid isolation membrane to switch between a first position and a second position; when the concentration value represented by the acetic acid detection signal is greater than a first preset threshold value, the control module sends a first control instruction, which is used to instruct the driving mechanism to drive the acetic acid isolation membrane to switch to the first position.

[0018] Optionally, the first gas detection device includes an infrared gas detection device, and / or the second gas detection device includes a catalytic combustion gas sensor.

[0019] Optionally, the display module is further configured to receive the acetic acid detection signal and display it simultaneously with the preferred detection signal.

[0020] To solve the above technical problems, an embodiment of the present invention further provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored. When the computer program is run by a processor, the steps of the above method are executed.

[0021] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0022] An embodiment of the present invention provides a gas detection method, comprising: receiving an acetic acid detection signal, wherein the acetic acid detection signal is used to characterize the concentration of the acetic acid gas component in the gas; receiving a first candidate detection signal and a second candidate detection signal, wherein the first candidate detection signal and the second candidate detection signal are both used to characterize the concentration of the target gas component in the gas, and the first candidate detection signal and the second candidate detection signal are respectively obtained from gas detection devices with different sensitivities to acetic acid; and according to the acetic acid detection signal, selecting a preferred detection signal from the first candidate detection signal and the second candidate detection signal and displaying it.

[0023] By adopting this embodiment, gas detection that is resistant to acetic acid interference can be achieved more reliably, especially improving the detection accuracy of target gas components in complex gas environments. Specifically, compared with the existing dual-sensor joint detection scheme that determines whether there is acetic acid interference based on mutual verification between two sensors, resulting in the inability to effectively identify the presence of acetic acid interference in complex gas environments where acetic acid and target gas components coexist, this embodiment is based on a special acetic acid detection signal to accurately identify acetic acid interference in any gas environment. Furthermore, using the acetic acid detection signal as the selection criterion, a more appropriate one is selected from the first candidate detection signal and the second candidate detection signal for display, to ensure that the displayed preferred detection signal can always accurately characterize the concentration of the target gas component.

[0024] An embodiment of the present invention also provides a gas detection system, comprising: a first gas detection device, for detecting the concentration of a target gas component in the gas and outputting a first candidate detection signal; a second gas detection device, for detecting the concentration of a target gas component in the gas and outputting a second candidate detection signal, wherein the first gas detection device and the second gas detection device have different sensitivities to acetic acid; an acetic acid gas detection device, for detecting the concentration of the acetic acid gas component in the gas and outputting an acetic acid detection signal; a control module, coupled to the first gas detection device, the second gas detection device and the acetic acid gas detection device, respectively, the control module being configured to receive the acetic acid detection signal, the first candidate detection signal and the second candidate detection signal, and to select a preferred detection signal from the first candidate detection signal and the second candidate detection signal based on the acetic acid detection signal; a display module, coupled to the control module, the display module being configured to receive and display the preferred detection signal.

[0025] This embodiment enables more reliable gas detection that is resistant to acetic acid interference, particularly improving the detection accuracy of target gas components in complex gas environments. Specifically, by adding an acetic acid gas detection device specifically designed for acetic acid detection, acetic acid interference can be accurately identified in any gas environment. Furthermore, using the acetic acid detection result output by the acetic acid gas detection device as the selection criterion, the more appropriate candidate detection signal is selected for display from the first and second candidate detection signals, ensuring that the displayed preferred detection signal always accurately represents the concentration of the target gas component.

[0026] Furthermore, gas detection devices with varying degrees of sensitivity to acetic acid can specifically include a first gas detection device sensitive to acetic acid and a second gas detection device insensitive to acetic acid. Furthermore, the first gas detection device more accurately detects the target gas component. This embodiment uses the acetic acid detection signal as the selection criterion. When no acetic acid interference is detected, the output of the more accurate first gas detection device is displayed. When acetic acid interference is detected, the output of the insensitive second gas detection device is displayed. This maximizes the advantages of the expensive and accurate first gas detection device, which can be, for example, an infrared gas detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a principle block diagram of a gas detection system according to an embodiment of the present invention;

[0028] Figure 2 is a flow chart of a gas detection method according to an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a first gas detection device according to an embodiment of the present invention;

[0030] Figure 4 yes Figure 3 An exploded view of the first gas detection device shown;

[0031] Figure 5 yes Figure 3 A cross-sectional view of the first gas detection device along the AA direction;

[0032] Figure 6 yes Figure 3 A cross-sectional view of the infrared gas sensor in the first gas detection device along direction BB is shown. DETAILED DESCRIPTION

[0033] As mentioned in the background art, existing gas detection solutions that resist acetic acid interference are only applicable to single gas environments and perform poorly in complex gas environments.

[0034] Taking the dual-sensor joint detection solution disclosed in Chinese patent application CN111982850A as an example, the core idea of this solution is to use a catalytic combustion sensor that is not affected by acetic acid to assist the infrared methane sensor in double verification to determine whether the infrared methane sensor has a false alarm.

[0035] Specifically, when the concentration C detected by the infrared methane sensor is less than 5% FS and the concentration C1 detected by the catalytic combustion sensor is less than 5% FS (recorded as case 1), or when the concentration C detected by the infrared methane sensor is greater than or equal to 5% FS and the concentration C1 detected by the catalytic combustion sensor is greater than or equal to 5% FS (recorded as case 2), since the output difference between the infrared methane sensor and the catalytic combustion sensor is not large, the concentration C detected by the infrared methane sensor is displayed on the LCD operation panel.

[0036] When the infrared methane sensor detects a concentration C ≥ 5% FS, but the catalytic combustion sensor detects a concentration C1 < 5% FS (Case 3), the infrared methane sensor and the catalytic combustion sensor show a significant difference in detection results, indicating that the infrared methane sensor is being interfered with by acetic acid. In this case, the infrared methane sensor's concentration C is not displayed on the LCD control panel to eliminate the impact of acetic acid on the infrared methane sensor.

[0037] It can be understood that the dual sensors in situation 1 are actually in a single gas environment containing only methane, or a gas environment containing neither methane nor acetic acid; the dual sensors in situation 2 may be in a single gas environment containing only methane, or in a complex gas environment containing both acetic acid and methane; the dual sensors in situation 3 are actually in a single gas environment containing only acetic acid.

[0038] In the complex gas environment of Case 2, where both acetic acid and methane are present, the existing solution will display the concentration C detected by the infrared methane sensor on the LCD panel. However, the value of C is actually incorrect because both acetic acid and methane in this scenario will cause the infrared methane sensor to output a signal. Therefore, the existing dual-sensor joint detection solution is not reliable in resisting acetic acid interference, especially in complex gas environments.

[0039] After analysis, the inventors discovered that one of the causes of this problem is that existing technology relies solely on mutual verification between two sensors to determine whether an infrared methane sensor is interfered with by acetic acid, rather than considering the actual presence of acetic acid in the environment. As a result, existing technology blindly trusts the output of the infrared methane sensor as long as the outputs of the two sensors are essentially consistent, which is clearly unreasonable.

[0040] Taking the complex gas environment described in Case 2 above as an example, when both acetic acid and methane are present, the concentrations detected by both sensors may be ≥ 5% FS. However, the concentration C detected by the infrared methane sensor is inaccurate due to interference from acetic acid. Using C as the displayed value clearly fails to effectively resist acetic acid interference. Therefore, existing dual-sensor combined detection solutions have poor reliability in resisting acetic acid interference.

[0041] To solve the above technical problems, an embodiment of the present invention provides a gas detection method, comprising: receiving an acetic acid detection signal, wherein the acetic acid detection signal is used to characterize the concentration of the acetic acid gas component in the gas; receiving a first candidate detection signal and a second candidate detection signal, wherein the first candidate detection signal and the second candidate detection signal are both used to characterize the concentration of the target gas component in the gas, and the first candidate detection signal and the second candidate detection signal are respectively obtained from gas detection devices with different sensitivities to acetic acid; according to the acetic acid detection signal, selecting a preferred detection signal from the first candidate detection signal and the second candidate detection signal and displaying it.

[0042] This implementation enables more reliable gas detection that is resistant to acetic acid interference, particularly improving the detection accuracy of target gas components in complex gas environments. Specifically, a dedicated acetic acid detection signal enables accurate identification of acetic acid interference in any gas environment. Furthermore, using the acetic acid detection signal as the selection criterion, the preferred candidate detection signal is selected for display from the first and second candidate detection signals, ensuring that the displayed preferred detection signal consistently accurately represents the concentration of the target gas component.

[0043] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] Figure 1 This is a principle block diagram of a gas detection system according to an embodiment of the present invention.

[0045] The disclosed solution can be applied to combustible gas detection scenarios. For example, a gas detection system can be installed in industrial sites such as the petrochemical industry where combustible gas leaks are likely to occur, to detect combustible gas leaks in the environment. Combustible gas is the target gas detected by the infrared gas detection device 1, and the main component of the combustible gas is the target gas component that the gas detection system needs to detect. The target gas component (or target gas) can be, for example, methane.

[0046] Specifically, refer to Figure 1 The gas detection system of this embodiment may include a first gas detection device 1, a second gas detection device 2, and an acetic acid gas detection device 3. The three gas detection devices may be deployed in the same industrial site to detect the concentration of specific gas components in the ambient gas of the industrial site.

[0047] Furthermore, the acetic acid gas detection device 3 is used to detect the acetic acid gas component. The first gas detection device 1 and the second gas detection device 2 are used to detect the same gas component, such as the target gas component. The target gas component is a gas component different from acetic acid, such as methane.

[0048] For example, the first gas detection device 1 is used to detect the concentration of the target gas component in the gas and output a first candidate detection signal (denoted as sigal_1), the second gas detection device 2 is used to detect the concentration of the target gas component in the gas and output a second candidate detection signal (denoted as sigal_2), and the acetic acid gas detection device 3 is used to detect the concentration of the acetic acid gas component in the gas and output an acetic acid detection signal (denoted as sigal_3). The gas can be a gas collected from the environment in which the gas detection system is located, that is, the ambient gas of the industrial site.

[0049] Furthermore, the first gas detection device 1 and the second gas detection device 2 can be different types of gas sensors, each with different sensitivities to acetic acid. The sensitivity to acetic acid can specifically refer to whether the sensor reacts to acetic acid and outputs a detection signal representing the concentration of acetic acid in the gas. Different types can specifically refer to operating using different principles, such as one of the first gas detection device 1 and the second gas detection device 2 being an infrared absorption type, while the other being a carrier catalytic combustion type, thermal conductivity type, or optical interferometry type.

[0050] In some embodiments, three gas detection devices may be arranged close to each other in an industrial site to ensure that the gas detected by each gas detection device contains substantially the same gas components.

[0051] In some embodiments, for any of the three types of gas detection devices, the gas detection device may include a single gas sensor or a sensor array comprising multiple gas sensors of the same type (or different types with the same sensitivity to acetic acid). For example, a single gas sensor may be installed at the junction of a pipeline used to transport methane at an industrial site to focus on monitoring whether there is a methane leak at the pipeline junction. For another example, the multiple gas sensors included in the sensor array may be distributed in different areas of the industrial site, thereby achieving gas detection throughout the industrial site.

[0052] Next, this embodiment will be described in detail by taking the example that the sensitivity of the second gas detection device 2 to acetic acid is lower than that of the first gas detection device 1 to acetic acid.

[0053] Specifically, the first gas detection device 1 may include an infrared gas detection device that is sensitive to acetic acid. That is, the first gas detection device 1 will react to both acetic acid and the target gas component and output corresponding concentration values.

[0054] Furthermore, the second gas detection device 2 may include a catalytic combustion gas sensor that is insensitive to acetic acid. That is, the second gas detection device 2 only responds to target gas components and outputs corresponding concentration values.

[0055] In one specific implementation, continue to refer to Figure 1 The gas detection system may further include a control module 4, which is coupled to the first gas detection device 1, the second gas detection device 2 and the acetic acid gas detection device 3 respectively.

[0056] In some embodiments, for any of the three gas detection devices, the control module 4 and the gas detection device can be connected via a wired connection. For example, the control module 4 can be located in a control room at an industrial site, and the gas detection device transmits detection signals to the control module 4 via a signal line.

[0057] In some embodiments, for any of the three gas detection devices, the control module 4 and the gas detection device may also be connected wirelessly. For example, the gas detection device may wirelessly transmit detection signals to the control module 4 via Bluetooth, Wi-Fi, Zigbee, or the like.

[0058] Figure 2 This is a flow chart of a gas detection method according to an embodiment of the present invention. The control module 4 can execute Figure 2The method steps described in the illustrated embodiment are to select a detection result that more accurately represents the concentration of the target gas component in the current gas environment from the candidate detection signals output by the first gas detection device 1 and the second gas detection device 2. Furthermore, the selected detection result can be displayed as the preferred detection signal for user viewing.

[0059] Specifically, combined Figure 1 and Figure 2 , the control module 4 may execute step S101 to receive an acetic acid detection signal. For example, the acetic acid gas detection device 3 may periodically transmit the acetic acid detection signal to the control module 4. For another example, the acetic acid gas detection device 3 may continuously monitor the concentration of acetic acid gas components in the environment and generate an acetic acid detection signal and transmit it to the control module 4 when a change (e.g., a surge) in the acetic acid concentration is detected.

[0060] Furthermore, the control module 4 may execute step S102 to receive the first candidate detection signal and the second candidate detection signal. For example, the first gas detection device 1 may transmit the first candidate detection signal to the control module 4 in real time. For another example, the second gas detection device 2 may periodically generate the second candidate detection signal and transmit it to the control module 4.

[0061] In some embodiments, step S101 and step S102 may be executed synchronously or asynchronously. Furthermore, when executed asynchronously, the order of executing step S101 and step S102 may be interchanged.

[0062] After receiving the first candidate detection signal, the second candidate detection signal and the acetic acid detection signal respectively, the control module 4 may further execute step S103 to select and display a preferred detection signal from the first candidate detection signal and the second candidate detection signal according to the acetic acid detection signal.

[0063] In a specific implementation, when executing step S103 , the control module 4 may determine, based on the acetic acid detection signal, whether to determine the first candidate detection signal or the second candidate detection signal as the preferred detection signal for display.

[0064] Specifically, if the concentration value represented by the acetic acid detection signal is greater than the first preset threshold, the control module 4 may determine the second candidate detection signal as the preferred detection signal and display it. If the concentration value represented by the acetic acid detection signal is less than or equal to the first preset threshold, the control module 4 may determine the first candidate detection signal as the preferred detection signal and display it.

[0065] Furthermore, the first preset threshold can be used to determine whether the concentration of acetic acid gas in the gas meets the criteria for determining an acetic acid leak. For example, the first preset threshold can be 0. This means that as long as acetic acid gas is present in the detected gas, an acetic acid leak is considered to have occurred, and the control module 4 will select the output of the catalytic combustion gas sensor as the preferred detection signal for display. If no acetic acid gas is detected in the detected gas, the control module 4 will select the output of the infrared gas detection device as the preferred detection signal for display. In actual applications, the specific value of the first preset threshold can be adjusted as needed.

[0066] In some embodiments, a first preset threshold value can be set based on the concentration of the acetic acid gas component that would cause a false alarm by the first gas detection device 1, so as to rationally design the timing for switching from the first candidate detection signal to the second candidate detection signal for display. For example, assuming that a false alarm would be caused by the first gas detection device 1 when the concentration of the acetic acid gas component in the detected gas reaches 0.08, the first preset threshold value can be set to 0.08.

[0067] Therefore, using the acetic acid detection signal as the selection criterion, when no acetic acid interference is detected, the output of the more accurate first gas detection device 1 is selected for display; when acetic acid interference is detected, the output of the second gas detection device 2, which is insensitive to acetic acid, is selected for display. This maximizes the advantages of expensive and accurate infrared gas detection devices.

[0068] In one embodiment, the acetic acid detection signal output by the acetic acid gas detection device 3 can be a qualitative analysis result. That is, the acetic acid detection signal represents a concentration value of 0 or 1, where 0 indicates the absence of acetic acid gas in the gas, and 1 indicates the presence of acetic acid gas in the gas. Accordingly, the first preset threshold value can be 0. Acetic acid gas detection devices 3 that perform qualitative analysis are generally low-cost, so this embodiment can detect acetic acid interference at a lower cost, thereby achieving a balance between low cost and accurate target gas detection.

[0069] In a specific implementation, the acetic acid detection signal output by the acetic acid gas detection device 3 may be a quantitative analysis result. That is, the concentration value represented by the acetic acid detection signal is the specific concentration of the acetic acid gas component in the gas.

[0070] Furthermore, in this embodiment, the control module 4 can simultaneously display the received acetic acid detection signal and the selected preferred detection signal. This expands the functionality of the gas detection system, allowing it to present the user with both the concentration of the detected target gas component (e.g., methane) and the acetic acid concentration.

[0071] In one specific implementation, continue to refer to Figure 1The gas detection system may further include: a display module 5 coupled to the control module 4, for receiving and displaying the preferred detection signal.

[0072] In some embodiments, the display module 5 can be integrated with the control module 4, or can be independently provided. For example, the display module 5 and the control module 4 can be a display and a processor of a computer provided in a control room, respectively.

[0073] In some embodiments, the display module 5 may include a display screen, on which the received preferred detection signal is displayed for the user to view. For example, the display screen may display in real time the concentration value represented by the currently received preferred detection signal. In another example, the display screen may display the concentration values represented by the preferred detection signal received over a recent period of time in the form of a curve, allowing the user to intuitively view the recent changing trends of the target gas composition within the industrial site.

[0074] In some embodiments, the display module 5 may include a user's smart terminal, such as a mobile phone, IPAD, etc. Thus, the user can conveniently view the detection results (ie, the preferred detection signal) of the gas detection system anytime and anywhere.

[0075] Furthermore, the display module 5 and the control module 4 can communicate with each other via wired or wireless means.

[0076] In one embodiment, when executing step S103, after determining the preferred detection signal, the control module 4 can directly send the preferred detection signal to the display module 5. That is, in this embodiment, the display module 5 directly receives the concentration value to be displayed from the control module 4 and displays it on the display screen.

[0077] In one variation, when executing step S103, after determining the preferred detection signal, the control module 4 may send an indication to the display module 5 to indicate whether the first candidate detection signal or the second candidate detection signal is selected as the preferred detection signal. Accordingly, the display module 5 may also be coupled to the first gas detection device 1 and the second gas detection device 2, respectively, to directly receive the preferred detection signal from the selected gas detection device based on the indication.

[0078] Taking the case where the control module 4 determines the first candidate detection signal as the preferred detection signal as an example, in response to receiving the indication information, the display module 5 obtains and displays the first candidate detection signal.

[0079] In this variation, candidate detection signals that are not indicated as preferred detection signals may not be acquired by the display module 5. Alternatively, the display module 5 may acquire the first candidate detection signal and the second candidate detection signal separately, and display only the candidate detection signal selected as the preferred detection signal according to the indication information.

[0080] In a specific implementation, the control module 4 may further send an acetic acid detection signal to the display module 5. In response to receiving the acetic acid detection signal, the display module 5 may simultaneously display the received acetic acid detection signal and the preferred detection signal.

[0081] Alternatively, the acetic acid detection signal may be directly obtained by the display module 5 from the acetic acid gas detection device 3. For example, the display module 5 may be directly coupled to the acetic acid gas detection device 3 to directly obtain the acetic acid detection signal.

[0082] In a specific implementation, the gas detection system may further include: a reminder module (not shown), coupled to the control module 4 , configured to issue reminder information in the form of sound, light, etc. under the control of the control module 4 .

[0083] For example, the reminder module may be integrated into the first gas detection device 1 , the second gas detection device 2 and / or the acetic acid gas detection device 3 , or be disposed near the gas detection device.

[0084] When the concentration of the target gas component represented by the preferred detection signal exceeds a second preset threshold, the control module 4 can control the reminder module to issue a reminder so that people near the gas detection device can promptly discover and take appropriate measures. In actual applications, the specific value of the second preset threshold can be set as needed.

[0085] As described above, this embodiment enables more reliable gas detection that is resistant to acetic acid interference, particularly improving the detection accuracy of target gas components in complex gas environments. Specifically, by adding an acetic acid gas detection device 3 specifically designed for acetic acid detection, acetic acid interference can be accurately identified in any gas environment. Furthermore, using the acetic acid detection result output by the acetic acid gas detection device 3 as the selection criterion, the more appropriate candidate detection signal is selected for display from the first and second candidate detection signals, ensuring that the displayed preferred detection signal consistently accurately represents the concentration of the target gas component.

[0086] Figure 3 1 is a schematic structural diagram of a first gas detection device 1 according to an embodiment of the present invention; Figure 4 yes Figure 3 An exploded view of the first gas detection device 1 is shown; Figure 5 yes Figure 3 A cross-sectional view of the first gas detection device 1 along the AA direction is shown; Figure 6 yes Figure 3 The sectional view of the infrared gas sensor 13 along the BB direction in the first gas detection device 1 is shown. In order to more clearly illustrate the technical features of this embodiment, Figure 4 The infrared gas sensor 13 is not shown. Figure 5The cover 12, the main body 11 and the portion of the infrared gas sensor 13 located inside the cover 12 are mainly cut out for exemplary display. Figure 6 The cross-sectional view of the portion of the infrared gas sensor 13 located inside the cover 12 along the BB direction is shown as an example only.

[0087] For ease of description, the first gas detection device 1 is Figure 3 The length direction when placed at the angle shown is recorded as the x direction, and the height direction is recorded as the z direction. Figure 3 The angle shown may be a conventional placement posture of the first gas detection device 1 when it is working, that is, the first gas detection device 1 may be placed in an industrial site in a roughly horizontal cylindrical posture, in which case the x direction may be parallel to the radial direction of the cylinder. Figure 3 The first gas detection device 1 shown is rotated 90° and arranged in an upright cylindrical posture. This embodiment does not limit the placement posture of the first gas detection device 1.

[0088] Specifically, refer to Figures 3 to 5 In this embodiment, the first gas detection device 1 may include a main body 11 (also referred to as an inner cavity). The main body 11 may be generally cylindrical and extend along the x-direction. A hollow portion of the cylindrical structure extends along the x-direction and passes through both ends of the main body 11. The hollow portion is adapted to form a gas chamber 111.

[0089] The main body 11 is provided with an air chamber inlet 112 and an air chamber outlet 113. Furthermore, the air chamber inlet 112 and the air chamber outlet 113 can be provided on opposite sides of the main body 11. For example, the air chamber inlet 112 and the air chamber outlet 113 can be provided on opposite sides of the main body 11 along the z-direction and connected to the air chamber 111. Gas enters the air chamber 111 through the air chamber inlet 112 and exits through the air chamber outlet 113. For example, the air chamber inlet 112 is located below the air chamber outlet 113 along the z-direction.

[0090] Furthermore, the first gas detection device 1 may include a cover 12, which is disposed over the main body 11. The cover 12 can provide a degree of protection and sealing. During assembly, the main body 11 can be extended into the cover 12 along the x-direction at the angle shown in the figure until the chassis 114 of the main body 11 and the cover 12 abut against each other. At this point, the majority of the main body 11 is contained within the cover 12, which is adapted to seal the left end of the gas chamber 111 along the x-direction.

[0091] The housing 12 may be provided with an air inlet 121 and an air outlet 122 on opposite sides thereof, wherein the air inlet 121 communicates with the air chamber inlet 112, and the air outlet 122 communicates with the air chamber outlet 113. To match the relative positions of the air chamber inlet 112 and the air chamber outlet 113 on the main body 11, the air inlet 121 and the air outlet 122 may be provided on opposite sides of the housing 12 along the z-direction. For example, the air inlet 121 may be located below the air outlet 122 along the z-direction.

[0092] The channel connecting the gas inlet 121 and the gas chamber inlet 112 is referred to as the gas inlet section s1, and the channel connecting the gas chamber outlet 113 and the gas outlet 122 is referred to as the gas outlet section s2. Gas enters the first gas detection device 1 from the gas inlet 121, passes through the gas inlet section s1 to the gas chamber inlet 112, and then enters the gas chamber 111. It then leaves the gas chamber 111 at the gas chamber outlet 113, and finally passes through the gas outlet section s2 to the gas outlet 122 before leaving the first gas detection device 1. Thus, the gas inlet section s1, the gas chamber 111, and the gas outlet section s2 together constitute the gas flow path within the first gas detection device 1.

[0093] The passage of the air inlet section s1 may be formed by at least one of the cover body 12 and the main body 11 . Similarly, the passage of the air outlet section s2 may be formed by at least one of the cover body 12 and the main body 11 .

[0094] For example, the main body 11 may be provided with a partition 115 within the cylindrical structure, with the partition 115 extending a certain distance from the bottom plate 114 along the x-direction toward the cover 12. The partition 115 is adapted to form the lower boundary of the air chamber 111 along the z-direction, and the gap between the partition 115 and the left end of the main body 11 along the z-direction forms the air chamber inlet 112. The partition 115 can separate the air inlet 121 from the air chamber 111 in the z-direction, thereby preventing foreign matter from directly entering the air chamber 111 through the air inlet 121. The partition 115 and the wall of the main body 11 located below the partition 115 along the z-direction together form the air inlet section s1.

[0095] For another example, on a plane perpendicular to the x-direction, a non-zero gap may exist between the cover 12 and the main body 11. Accordingly, the walls of the cover 12 and the main body 11 that are suitable for forming the upper boundary of the air chamber 111 along the z-direction together form an air outlet section s2.

[0096] Along the z-direction, the air inlet 121 and the air chamber entrance 112 can be staggered, that is, they are not on the same straight line along the z-direction. Similarly, the air outlet 122 and the air chamber outlet 113 can also be staggered along the z-direction. This can prevent foreign matter from easily entering the air chamber 111 through the air inlet 121 or the air outlet 122.

[0097] Further, continue to refer to Figures 3 to 6The first gas detection device 1 may include an infrared gas sensor 13 for detecting the concentration of the target gas in the gas chamber 111 using the infrared absorption principle and outputting a first detection signal. Specifically, the infrared gas sensor 13 may detect the concentration of the target gas component in the gas flowing through the gas chamber 111 and output a first candidate detection signal.

[0098] The infrared gas sensor 13 may include an insert 131 and a base 132. The insert 131 may be, for example, two symmetrically arranged columns extending outward from the base 132 in the x-direction and connected at the far left to form an end face. During assembly, the insert 131 extends into the cylindrical structure of the main body 11 along the x-direction at the angle shown in the figure until it abuts the left end of the cover 12 in the x-direction. The screw 15 extends from the left end of the cover 12 and couples with the screw hole 135 provided in the insert 131, thereby at least securing the cover 12 and the infrared gas sensor 13.

[0099] The contour shape of the inserting portion 131 may be adapted to at least a portion of the cylindrical structure of the main body 11 , thereby achieving mutual positioning between the infrared gas sensor 13 and the main body 11 .

[0100] An infrared light source 134 is provided on the side of the base 132 facing the main body 11 . A reflector 133 is provided on the side of the left end of the insertion portion 131 in the x direction facing the base 132 for reflecting infrared light emitted by the infrared light source 134 .

[0101] The base 132 may be integrated with components such as a processing module (not shown) for receiving and processing the near-infrared spectrum generated by the target gas component in the gas chamber 111 under infrared light irradiation to obtain a first candidate detection signal.

[0102] Furthermore, the first gas detection device 1 may include an acetic acid barrier 14 that is movable between a first position and a second position. In the first position, the acetic acid barrier 14 covers at least the cross-section of the gas inlet section s1, while in the second position, the acetic acid barrier 14 exposes at least the cross-section of the gas inlet section s1 to restrict acetic acid gas (e.g., the acetic acid gas component in the gas entering the first gas detection device 1) from entering the gas chamber 111. For example, the acetic acid barrier 14 may be movably positioned at any position in the passage between the gas inlet 121 and the gas chamber inlet 112. Thus, the acetic acid barrier 14 in the first position can filter out acetic acid gas components that may be present in the gas before the gas reaches the gas chamber 111.

[0103] Figure 5The example shown here uses the acetic acid isolation film 14 covering the gas chamber inlet 112. In practice, the acetic acid isolation film 14 can also be positioned anywhere else in the inlet section s1, such as at the inlet 121 or midway through the passageway from the inlet 121 to the gas chamber inlet 112. Covering the gas chamber inlet 112 with the acetic acid isolation film 14 can mean that the acetic acid isolation film 14 blocks the through-hole forming the gas chamber inlet 112.

[0104] In one embodiment, the main body 11 may be provided with a snap-fit portion (not shown), and the acetic acid isolation membrane 14 may be correspondingly provided with a coupling portion (not shown). The snap-fit portion cooperates with the coupling portion to secure the acetic acid isolation membrane 14 within the first gas detection device 1 and ensure that the acetic acid isolation membrane 14 is securely positioned to cover the cross section of the air inlet section s1.

[0105] In a variation, the buckle portion may be provided on the cover 12. Alternatively, the cover 12 and the main body 11 may be provided with buckle portions respectively to ensure reliable fixation of the acetic acid isolation membrane 14.

[0106] Furthermore, the buckle portion and the coupling portion can be decoupled, so that the acetic acid isolation membrane 14 can be removed from the first gas detection device 1 for replacement.

[0107] In one embodiment, there may be multiple acetic acid isolation membranes 14, which may be spaced apart at multiple locations along the gas flow path in the gas inlet section s1. Thus, if one of the multiple acetic acid isolation membranes 14 fails, the remaining acetic acid isolation membranes 14 can continue to isolate acetic acid from entering the gas chamber 111.

[0108] In one embodiment, the acetic acid barrier film 14 can also cover the cross-section of the gas outlet section s2. For example, the acetic acid barrier film 14 can be positioned anywhere in the passage between the gas outlet 122 and the gas chamber outlet 113. Thus, by also positioning the acetic acid barrier film 14 in the passage between the gas outlet 122 and the gas chamber outlet 113, acetic acid gas can be prevented from penetrating into the gas chamber 111 from the gas outlet 122.

[0109] Figure 5 The example in which the acetic acid isolation film 14 covers the gas chamber outlet 113 is used for exemplary display. In actual application, the acetic acid isolation film 14 can also be set at any other position of the gas outlet section s2, such as the middle position of the channel between the gas outlet 122 and the gas chamber outlet 113.

[0110] Furthermore, the number of the acetic acid isolation membranes 14 can be multiple, and the multiple acetic acid isolation membranes 14 can be spaced apart and arranged at multiple positions of the gas outlet section s2 along the gas flow path.

[0111] In some embodiments, the main body 11 and / or the cover 12 near the gas outlet section s2 may be provided with a snap portion to fix the acetic acid insulation membrane at a position covering the cross section of the gas outlet section s2.

[0112] The following describes in detail the example where both the gas chamber inlet 112 and the gas chamber outlet 113 are provided with the acetic acid isolation membrane 14 .

[0113] Taking the acetic acid isolation membrane 14 movably disposed at the gas chamber inlet 112 as an example, in its first position, the acetic acid isolation membrane 14 covers the through-hole forming the gas chamber inlet 112, ensuring that all gas passing through the gas chamber inlet 112 effectively contacts the acetic acid isolation membrane 14. In contrast, in its second position, the acetic acid isolation membrane 14 completely exposes the through-hole forming the gas chamber inlet 112. In this case, gas passing through the gas chamber inlet 112 does not pass through the acetic acid isolation membrane 14. In other words, along the z-direction, the acetic acid isolation membrane 14 in its second position and the gas chamber inlet 112 are not collinear.

[0114] Furthermore, the first gas detection device 1 may include a driving mechanism 22 , which is disposed in the housing 12 and is used to drive the acetic acid isolation membrane 14 to switch between the first position and the second position.

[0115] Continuing with the example of the acetic acid barrier membrane 14 movably positioned at the gas chamber inlet 112, the drive mechanism 22 may include a rotation mechanism fixed to the side of the partition 115 facing away from the gas chamber 111. The acetic acid barrier membrane 14 is connected to the rotation mechanism and is driven by the rotation mechanism to rotate within a plane perpendicular to the z-direction. Thus, when acetic acid isolation is required, the drive mechanism 22 rotates the acetic acid barrier membrane 14 to a first position covering the gas chamber inlet 112. When acetic acid isolation is not required, the drive mechanism 22 rotates the acetic acid barrier membrane 14 in the opposite direction to a second position exposing the gas chamber inlet 112.

[0116] The driving mechanism 22 can also be, for example, push rods provided on both sides of the acetic acid isolation membrane 14 along the x-direction. The push rods on both sides cooperate to push the acetic acid isolation membrane 14 to move along the x-direction to switch between the first position and the second position.

[0117] In one specific implementation, when the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, before / while / after executing step S103 to determine the second candidate detection signal as the preferred detection signal and display it, the control module 4 may also execute the step of limiting the acetic acid gas component in the gas from entering the first gas detection device 1.

[0118] Specifically, the gas entering the first gas detection device 1 may be filtered to remove acetic acid gas components in the gas.

[0119] For example, the acetic acid isolation membrane 14 can normally be maintained in the second position. When the concentration value represented by the acetic acid detection signal is greater than the first preset threshold, the control module 4 can send a first control instruction to instruct the driving mechanism 22 to drive the acetic acid isolation membrane 14 to switch to the first position.

[0120] In one possible scenario, even if the first candidate detection signal is not selected as the preferred detection signal for display, the first gas detection device 1 still remains in operation, which means that gas will continue to enter the gas chamber 111. If the acetic acid isolation membrane 14 is not provided, when there is no longer acetic acid in the environment, the gas chamber 111 may continue to give false alarms due to the residual acetic acid that has previously entered therein, resulting in the control module 4 being unable to use the first candidate detection signal as the preferred detection signal. Therefore, when the presence of acetic acid in the environment is detected, this embodiment actively restricts the entry of acetic acid into the gas chamber 111, thereby preventing the residual acetic acid in the gas chamber 111 from affecting the accuracy of the subsequent output of the first gas detection device 1.

[0121] Furthermore, by configuring the acetic acid isolation membrane 14 as a movable component, the acetic acid isolation membrane 14 is prevented from excessive contact with gas when acetic acid isolation is not required, which helps extend the service life of the acetic acid isolation membrane 14. This is particularly helpful in resolving the problem of natural failure of the acetic acid isolation membrane 14 when the gas environment of the first gas detection device 1 is devoid of acetic acid. This natural failure can be caused by the acetic acid isolation membrane 14 being continuously exposed to air and affected by impurities in the air. Furthermore, this embodiment removes the acetic acid isolation membrane 14 that blocks the gas flow path when acetic acid isolation is not required, which helps ensure gas flow efficiency along the gas flow path.

[0122] In one embodiment, the first gas detection device 1 may further include a sealing mechanism 21, and the acetic acid isolation membrane 14 located in the second position is sealed within the sealing mechanism 21. For example, the sealing mechanism 21 may be disposed on a side of the partition 115 facing away from the gas chamber 111 to accommodate the acetic acid isolation membrane 14 that is moved to the second position by the driving mechanism 22.

[0123] In a specific implementation, the first gas detection device 1 may include a second control module 23 coupled to the driving mechanism 22 to control the operation of the driving mechanism 22 , thereby switching the acetic acid isolation membrane 14 to the first position or the second position.

[0124] Specifically, the second control module 23 can be integrated into the base 132, such as Figure 6 Alternatively, the second control module 23 can be disposed at any other location of the first gas detection device 1. Alternatively, the second control module 23 can be disposed at another location outside the first gas detection device 1 and coupled to the driving mechanism 22 wirelessly.

[0125] In one embodiment, the second control module 23 can communicate with a user's smart terminal. For example, in response to receiving a control instruction sent by the user via the smart terminal, the second control module 23 controls the drive mechanism 22 to move the acetic acid isolation membrane 14 to the first position or the second position indicated by the control instruction.

[0126] In another specific implementation, the second control module 23 can be coupled to the control module 4 and control the operation of the driving mechanism 22 according to the first control instruction sent by the control module 4.

[0127] For example, when the acetic acid detection signal output by the acetic acid gas detection device 3 indicates the presence of acetic acid gas in the environment described by the first gas detection device 1, the control module 4 sends a first control instruction to the second control module 23. In response to receiving the first control instruction, the second control module 23 controls the drive mechanism 22 to switch the acetic acid barrier 14 from the second position to the first position. In this state, the acetic acid barrier 14, switched to the first position, prevents acetic acid from entering the gas chamber 111.

[0128] For another example, when the acetic acid detection signal output by the acetic acid gas detection device 3 indicates that the gas entering the first gas detection device 1 does not contain acetic acid, the second control module 23 can control the drive mechanism 22 to drive the acetic acid isolation membrane 14 to switch from the first position to the second position. In this case, the gas can smoothly enter the gas chamber 111 without passing through the acetic acid isolation membrane 14.

[0129] In a specific implementation, under the premise of not hindering the realization of other components and functions in the first gas detection device 1, the apertures of the gas chamber inlet 112 and the gas chamber outlet 113 can be designed to be relatively large.

[0130] In some embodiments, the area enclosed by the projection of the air chamber inlet 112 on the first plane may occupy 1 / 2 to 2 / 3 of the area enclosed by the projection of the wall (e.g., partition 115) on the first plane in which the air chamber inlet 112 is formed. The first plane may be perpendicular to the z-direction.

[0131] In some embodiments, the area of the region enclosed by the projection of the air chamber outlet 113 on the first plane may account for 1 / 3-1 / 2 of the area of the region enclosed by the projection of the wall on which the air chamber outlet 113 is formed on the first plane.

[0132] In this way, the reaction speed of intake and exhaust gas that may be slowed down due to covering the acetic acid isolation film 14 on the gas flow path can be compensated, thereby ensuring the response speed of the first gas detection device 1.

[0133] In some embodiments, the air chamber inlet 112 and the air chamber outlet 113 can both be circular holes. Alternatively, the air chamber inlet 112 and the air chamber outlet 113 can also be rectangular holes, irregularly shaped holes, etc. Accordingly, the specific dimensions of the air chamber inlet 112 and the air chamber outlet 113 can be described by other suitable physical quantities besides the aperture. For example, the air chamber inlet 112 and / or the air chamber outlet 113 can be roughly trapezoidal. The trapezoidal design can both conform to the extended curvature of the wall of the main body 11 and maximize the opening size.

[0134] In one specific embodiment, the first gas detection device 1 may include a heating portion 136 disposed in the main body 11 and configured to heat the gas chamber 111. For example, the heating portion 136 may include a heating tube disposed within the insertion portion 131. Because the insertion portion 131 substantially extends through the entire gas chamber 111, the heating tube disposed therein facilitates uniform heating of the gas chamber 111. Thus, the chimney effect can be utilized to promote the automatic and spontaneous movement of gas along the gas flow path. This allows gas flow to be achieved without requiring a pump or other extraction device within the first gas detection device 1, thereby reducing costs.

[0135] Specifically, when the temperature in the gas chamber 111 is higher than the ambient temperature of the environment in which the first gas detection device 1 is located, gas convection from bottom to top will be formed. Therefore, in this embodiment, by setting a heating portion 136 in the gas chamber 111, the gas can automatically enter the first gas detection device 1 from the air inlet 121 located below, and after flowing through the air inlet section s1, the air chamber inlet 112, the air chamber 111, the air chamber outlet 113 and the air outlet section s2 in the first gas detection device 1, it is finally discharged from the first gas detection device 1 from the air outlet 122 located above. The flow path of the gas in the first gas detection device 1 can be as follows: Figure 5 The directions of the arrows illustrated by the dotted and double-dotted lines are shown.

[0136] Furthermore, the gas chamber inlet 112 and the gas chamber outlet 113 can be staggered and arranged on opposite sides of the main body 11. Thus, the gas chamber inlet 112 and the gas chamber outlet 113 are staggered in the vertical direction, so that the gas can fill the gas chamber 111 as much as possible, so that the gas concentration exposed in the optical path of the infrared light and the gas concentration in the gas environment in which the first gas detection device 1 is located are kept as consistent as possible.

[0137] In a specific implementation, the acetic acid isolation membrane 14 may include an alkaline membrane 141. The alkaline membrane 141 may be an alkaline thin film suitable for neutralizing the acetic acid gas component in the gas by chemical absorption based on the principle of acid-base neutralization.

[0138] Specifically, basicity refers to the property expressed by hydroxide "OH-", and acidity refers to the property expressed by hydrogen ions "H+".

[0139] Furthermore, an acetic acid isolation membrane 14 can be composed of one or more thin film layers. The more thin film layers a acetic acid isolation membrane 14 has, the thicker it is. Thickness may be positively correlated with the effectiveness of the acetic acid isolation membrane 14 in neutralizing acids and bases. That is, the thicker the acetic acid isolation membrane 14, the longer its lifespan.

[0140] Furthermore, the acetic acid barrier film 14 disposed at different locations along the gas flow path can comprise different numbers of film layers. Thus, the thickness of the acetic acid barrier film 14 at different locations along the gas flow path can be appropriately designed based on the probability of contact with acetic acid gas. For example, if the probability of contact with acetic acid gas is higher at the gas chamber inlet 112, the thickness of the acetic acid barrier film 14 covering the gas chamber inlet 112 can be greater than the thickness of the acetic acid barrier film 14 covering the gas chamber outlet 113.

[0141] In one embodiment, the first gas detection device 1 may include a coupled detection module 16 and a first control module 17. The detection module 16 is used to detect the effectiveness of the acetic acid isolation membrane 14, and the first control module 17 receives the detection result of the detection module 16 and issues a replacement reminder message when the detection result is failure.

[0142] Specifically, the effectiveness of the acetic acid isolation membrane 14 can be measured based on the alkalinity of the alkaline membrane 141, which refers to the alkalinity of the ions in the membrane. For example, when the alkalinity of the alkaline membrane 141 is greater than a specific threshold, the alkaline membrane 141 can effectively neutralize the acetic acid, and the alkaline membrane 141 is effective. As the alkaline membrane 141 and the acetic acid in the gas undergo an acid-base neutralization reaction, the alkalinity of the alkaline membrane 141 gradually decreases. When the alkalinity drops below a specific threshold, the alkaline membrane 141 can no longer effectively neutralize the acetic acid, and the alkaline membrane 141 becomes ineffective. The specific threshold can be, for example, a neutral pH of 7. In practical applications, the specific threshold can also be set to a specific value as needed.

[0143] Therefore, by adding a detection module 16 to detect the effectiveness of the acetic acid isolation membrane 14, it is beneficial to proactively and promptly monitor whether the life of the acetic acid isolation membrane 14 has expired. Furthermore, if the monitoring detects that the acetic acid isolation membrane 14 has failed, the first control module 17 promptly issues a replacement reminder message to remind the user to replace the acetic acid isolation membrane 14 as soon as possible.

[0144] Furthermore, the first control module 17 may be integrated into the base 132, such as Figure 6 Alternatively, the first control module 17 can be disposed at any other location of the first gas detection device 1. Alternatively, the first control module 17 can be disposed at another location outside the first gas detection device 1 and communicate with the detection module 16 wirelessly.

[0145] Furthermore, the replacement reminder information can be sent to the user's smart terminal, such as a mobile phone, IPAD, a central control computer that communicates with the first gas detection device 1, etc.

[0146] Furthermore, the replacement reminder information may be sent directly through the first gas detection device 1 in the form of sound, light, etc., so that people near the first gas detection device 1 can find it in time and take corresponding measures.

[0147] In one embodiment, the color of the alkaline membrane 141 can change with the alkalinity of the ions in the membrane. For example, an indicator can be added to the alkaline membrane 141, following the preparation process of litmus paper or pH test paper, so that the color of the alkaline membrane 141 changes with the alkalinity of the ions in the membrane.

[0148] Accordingly, the detection module 16 may include an image acquisition unit 161 disposed toward the alkaline membrane 141 for acquiring an image of the alkaline membrane 141. The image acquisition unit 161 may be, for example, a micro camera that may be fixed to a wall of the main body 11 facing the air chamber inlet 112 to ensure that the imaging area of the micro camera covers the alkaline membrane 141 disposed at the air chamber inlet 112.

[0149] Furthermore, the image acquisition unit 161 may acquire images of the alkaline film 141 periodically or in real time.

[0150] Furthermore, the detection module 16 may further include a first detection unit (not shown), coupled to the image acquisition unit 161 and the first control module 17. The first detection unit is configured to identify the color of the alkaline film 141 in the image captured by the image acquisition unit 161 and detect the effectiveness of the alkaline film 141 based on the color recognition result. The first detection unit may transmit the detection result to the first control module 17.

[0151] The first detection unit may be integrated into the first control module 17 . Alternatively, the first detection unit may be provided in the first gas detection device 1 independently of the first control module 17 .

[0152] The first detection unit may pre-store various possible colors of the alkaline film 141 and validity conclusions corresponding to each color. For example, when the alkaline film 141 is yellow, it is invalid, and when the alkaline film 141 is blue, it is valid.

[0153] Furthermore, the image captured by the image capturing unit 161 may be a color image, so that the first detection unit may directly recognize the color of the alkaline film 141 in the image and detect the effectiveness of the alkaline film 141 based on the color recognition result.

[0154] Alternatively, the image captured by the image acquisition unit 161 may be a black and white image, and the first detection unit may identify the grayscale value of the alkaline film 141 in the image and detect the effectiveness of the alkaline film 141 based on the grayscale value. In this example, the first detection unit may pre-store effectiveness conclusions corresponding to different grayscale values.

[0155] Therefore, the acetic acid insulation film 14 gradually changes color as its service life increases. By adding an image acquisition unit 161 in the first gas detection device 1 to monitor the color change of the acetic acid insulation film 14, a replacement prompt can be triggered in time when the acetic acid insulation film 14 is found to be invalid.

[0156] In another embodiment, the detection module 16 may include an acetic acid gas detection device 3 and a second gas detection device 2. When the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, the control module 4 determines the second candidate detection signal as the preferred detection signal and displays it, and controls the drive mechanism 22 to switch the acetic acid isolation membrane 14 to the first position.

[0157] If the concentration value represented by the second candidate detection signal is low, it can be assumed that the current gas contains only acetic acid and does not contain the target gas component. Control module 4 can further compare the difference between the concentration value represented by the first candidate detection signal and the concentration value represented by the second candidate detection signal. If the difference is large, it can be confirmed that acetic acid isolation membrane 14 has failed because acetic acid has entered gas chamber 111, causing infrared gas sensor 13 to output a large reading.

[0158] Therefore, the existing acetic acid gas detection device 3 and the second gas detection device 2 in the reused gas detection system can jointly determine whether the acetic acid isolation membrane 14 has failed through multiple sensors, thereby triggering a replacement prompt in time when the monitoring finds that the acetic acid isolation membrane 14 has failed.

[0159] In one specific implementation, continue to refer to Figures 3 to 5 A waterproof mechanism 18 may be provided in the gap between the cover 12 and the main body 11 to guide the liquid entering the cover 12 from the air inlet 121 and / or the air outlet 122 to flow out of the cover 12 along the outside of the main body 11. This prevents liquid from entering the air chamber 111 and interfering with the optical path of the infrared light.

[0160] Specifically, the cover body 12 may be provided with a liquid inlet 123 and a liquid outlet 124 on opposite sides along the z-direction, wherein the liquid inlet 123 may be provided adjacent to the air outlet 122 , and the liquid outlet 124 may be provided adjacent to the air inlet 121 .

[0161] During rain, water enters the housing 12 through the upper liquid inlet 123. Water is blocked by the waterproof mechanism 18 and flows downward along the outer side of the main body 11 due to gravity, ultimately flowing out of the housing 12 through the lower liquid outlet 124. The waterproof mechanism 18 effectively separates the liquid flow area from the gas flow area, effectively preventing external liquid from entering the gas chamber 111 and affecting the acetic acid detection results.

[0162] Furthermore, the waterproof mechanism 18 may include a first baffle 181 disposed near the air chamber inlet 112 . The first baffle 181 extends from the main body 11 toward the cover 12 to prevent liquid from reaching the air chamber inlet 112 .

[0163] Furthermore, the waterproof mechanism 18 may include a second baffle 182 disposed near the air chamber outlet 113 . The second baffle 182 extends from the main body 11 toward the cover 12 to prevent liquid from reaching the air chamber outlet 113 .

[0164] Furthermore, the second baffle 182 may be disposed as close to the gas outlet 122 as possible to ensure that the acetic acid isolation membrane 14 disposed in the gas outlet section s2 does not come into contact with the liquid.

[0165] In one variation, the portion of the main body 11 between the end distal to the air chamber outlet 113 and the first baffle 181 and / or the second baffle 182 can be flared. That is, along the x-direction, the wall of the main body 11 between the first baffle 181 and its left end can extend upwardly and in the x-direction. Similarly, along the x-direction, the wall of the main body 11 between the second baffle 182 and its left end can extend downwardly and in the x-direction. This allows liquid entering the housing 12 from the liquid inlet 123 to accelerate along the slope and reach the liquid outlet 124.

[0166] In a specific implementation, the first gas detection device 1 may include a sealing cover 19 disposed between the main body 11 and the base 132 . The sealing cover 19 may seal the connection gap between the main body 11 and the infrared gas sensor 13 .

[0167] In one embodiment, the main body 11 may be provided with a mesh 116 near the air chamber outlet 113. Along the z-direction, the mesh 116 may be higher than the air chamber outlet 113 to prevent foreign matter from falling into the air chamber outlet 113 from the air outlet 122.

[0168] The embodiment of the present invention further provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transient storage medium, on which a computer program is stored, and the computer program is executed by a processor. Figure 2The gas detection method provided in the illustrated embodiment preferably includes a computer-readable storage medium such as a non-volatile memory or a non-transitory memory. The storage medium may include a ROM, RAM, a magnetic disk, or an optical disk.

[0169] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A gas detection method, characterized in that: include: receiving an acetic acid detection signal, wherein the acetic acid detection signal is used to represent the concentration of the acetic acid gas component in the gas; receiving a first candidate detection signal and a second candidate detection signal, wherein the first candidate detection signal and the second candidate detection signal are both used to represent the concentration of the target gas component in the gas, and the first candidate detection signal and the second candidate detection signal are respectively obtained from gas detection devices having different sensitivities to acetic acid; According to the acetic acid detection signal, a preferred detection signal is selected from the first candidate detection signal and the second candidate detection signal and displayed.

2. The gas detection method according to claim 1, characterized in that: The first candidate detection signal is obtained from a first gas detection device that is sensitive to acetic acid, and the second candidate detection signal is obtained from a second gas detection device that is insensitive to acetic acid. The selecting and displaying a preferred detection signal from the first candidate detection signal and the second candidate detection signal based on the acetic acid detection signal includes: When the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, determining the second candidate detection signal as the preferred detection signal and displaying the signal; Otherwise, the first candidate detection signal is determined as the preferred detection signal and displayed.

3. The gas detection method according to claim 2, characterized in that: The first gas detection device includes an infrared gas detection device, and / or the second gas detection device includes a catalytic combustion gas sensor.

4. The gas detection method according to claim 1, wherein: The first candidate detection signal is obtained from a first gas detection device that is sensitive to acetic acid, and the method further includes: When the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, the acetic acid gas component in the gas is restricted from entering the first gas detection device.

5. The gas detection method according to claim 4, characterized in that: The limiting the acetic acid gas component in the gas from entering the first gas detection device comprises: The gas entering the first gas detection device is filtered to remove acetic acid gas components in the gas.

6. The gas detection method according to claim 1, characterized in that: Also includes: The preferred detection signal and the acetic acid detection signal are displayed simultaneously.

7. A gas detection system, characterized in that: include: a first gas detection device for detecting the concentration of a target gas component in the gas and outputting a first candidate detection signal; a second gas detection device, configured to detect a concentration of a target gas component in the gas and output a second candidate detection signal, wherein the first gas detection device and the second gas detection device have different sensitivities to acetic acid; an acetic acid gas detection device for detecting the concentration of the acetic acid gas component in the gas and outputting an acetic acid detection signal; a control module, coupled to the first gas detection device, the second gas detection device, and the acetic acid gas detection device, respectively, the control module being configured to receive the acetic acid detection signal, the first candidate detection signal, and the second candidate detection signal, and select a preferred detection signal from the first candidate detection signal and the second candidate detection signal based on the acetic acid detection signal; A display module is coupled to the control module, and is used to receive and display the preferred detection signal.

8. The gas detection system according to claim 7, characterized in that The sensitivity of the second gas detection device to acetic acid is lower than the sensitivity of the first gas detection device to acetic acid; When the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, the control module determines the second candidate detection signal as the preferred detection signal and sends it to the display module; When the concentration value represented by the acetic acid detection signal is less than or equal to the first preset threshold, the control module determines the first candidate detection signal as the preferred detection signal and sends it to the display module.

9. The gas detection system according to claim 7, wherein: The first gas detection device comprises: a main body, the main body having a gas chamber for containing gas and respectively opening a gas chamber inlet and a gas chamber outlet; A cover body is provided on the main body, and an air inlet and an air outlet are respectively opened on the cover body, wherein the air inlet is connected to the air chamber inlet, and the air outlet is connected to the air chamber outlet; an infrared gas sensor, configured to detect the concentration of the target gas in the gas chamber and output the first candidate detection signal; The acetic acid isolation membrane can move between a first position and a second position. The acetic acid isolation membrane in the first position covers at least the cross-section of the air inlet section. The acetic acid isolation membrane in the second position exposes at least the cross-section of the air inlet section to restrict acetic acid gas from entering the air chamber. The air inlet section is used to form a gas flow path connecting the air chamber entrance and the air inlet.

10. The gas detection system according to claim 9, wherein: The first gas detection device further includes a driving mechanism disposed in the housing and configured to drive the acetic acid isolation membrane to switch between the first position and the second position; When the concentration value represented by the acetic acid detection signal is greater than a first preset threshold, the control module sends a first control instruction, where the first control instruction is used to instruct the driving mechanism to drive the acetic acid isolation membrane to switch to a first position.

11. The gas detection system according to any one of claims 7 to 10, characterized in that The first gas detection device includes an infrared gas detection device, and / or the second gas detection device includes a catalytic combustion gas sensor.

12. The gas detection system according to claim 7, wherein: The display module is further configured to receive the acetic acid detection signal and display it simultaneously with the preferred detection signal.

13. A computer-readable storage medium, wherein the computer-readable storage medium is a non-volatile storage medium or a non-transient storage medium, and a computer program is stored thereon, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are performed.

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