Modular multi-gas detector

Abstract

The application discloses a modular multi-gas detector and relates to the technical field of gas detection equipment. The modular multi-gas detector comprises a shell, a fixing piece fixed on the shell and a sensor module dismounting block arranged in the shell. The sensor module dismounting block is provided with an air inlet, an air outlet and a gas detection cavity communicating with the air inlet and the air outlet. A flow guide block, a filtering unit for dynamically adjusting filtering precision and a detection unit are sequentially arranged in the gas detection cavity. A gas pump for forming negative pressure is arranged in the flow guide block. The filtering unit comprises expandable and contractible filtering fibers and a pressure applying assembly for driving the filtering fibers to expand and contract. The application has the effect of realizing efficient and accurate detection of multiple gases.

Description

Technical Field

[0001] This invention relates to the technical field of gas detection equipment, and in particular to a modular multi-gas detector. Background Technology

[0002] Gas detection technology has significant application value in industrial safety and environmental monitoring. Currently, most gas detection equipment on the market is either a single-gas detector or a fixed multi-gas detection system. Single-gas detectors have limited functionality and cannot meet the needs of simultaneous detection of multiple gases in complex environments; while fixed multi-gas detection systems are bulky, expensive, and inconvenient to carry and deploy quickly. With increasing industrial safety requirements and growing environmental monitoring needs, portable, multi-functional gas detection equipment has become a technological trend. In recent years, modular design concepts have been increasingly applied to gas detection equipment.

[0003] With the development of urban technology, modular multi-gas detectors are typically installed in urban sewer systems to monitor various gas components, ensuring the safe operation of the sewer system and environmental protection. These modular multi-gas detectors integrate multiple gas sensors, enabling real-time detection of different types of gases, such as hydrogen sulfide, biogas, and carbon monoxide.

[0004] However, existing modular detectors generally lack flexible filtration mechanisms, making it difficult to dynamically adjust the filtration effect according to different gas compositions and requirements, which may lead to reduced detection accuracy. In addition, traditional filtration mechanisms often use fixed filtration devices, which, although simple and easy to use, have poor filtration effects when faced with impurities of different particle sizes and concentrations, affecting the accuracy of the detection results. Summary of the Invention

[0005] This application provides a modular multi-gas detector, which enables efficient and accurate detection of multiple gases.

[0006] This application provides a modular multi-gas detector, which adopts the following technical solution:

[0007] A modular multi-gas detector includes a housing, a fastener fixed to the housing, and a sensor module disassembly block disposed within the housing. The sensor module disassembly block has an air inlet, an air outlet, and a gas detection chamber connecting the air inlet and the air outlet. A flow guide block, a filter unit for dynamically adjusting the filtration accuracy, and a detection unit are sequentially disposed within the gas detection chamber. A negative pressure air pump is disposed within the flow guide block. The filter unit includes expandable and contractible filter fibers and a pressure application component for driving the expansion and contraction of the filter fibers.

[0008] Preferably, the filter fibers of the filter unit are fixed on a filter screen with an arc-shaped cross-section, and a vibrating screen for cleaning the filter screen is provided between the filter screen and the detection unit.

[0009] Preferably, the detection unit includes a mounting frame with an arc-shaped cross-section, and a plurality of longitudinally extending mounting strips are provided inside the mounting frame. Multiple detection probes are fixed on the mounting strips, and airflow gaps are formed between adjacent mounting strips.

[0010] Preferably, the filter fiber is made of silicone and has an internal air cavity, which is connected to the airbag in the disassembly block through a pipe assembly, and the pressure application component includes a pressure plate for squeezing the airbag.

[0011] Preferably, the pressure application component includes a micro motor, a gear linked to the output end of the micro motor, a rack meshing with the gear, and a pressure plate fixed to the end of the rack, wherein the rack is slidably disposed within the guide rail of the disassembly block.

[0012] Preferably, the disassembly block is provided with a vibration component that shares a power source with the pressure application component. The vibration component includes a rotating rod that is fixed coaxially with the gear, and an eccentric block for impacting the vibration component is provided on the rotating rod.

[0013] Preferably, the vibration assembly includes metal vibration fibers fixed on the vibration net, a positioning sleeve disposed in the disassembly block, and a first ball, a second ball, and a spring disposed in the positioning sleeve. The second ball is linked with the first ball through the spring, and the eccentric block periodically impacts the second ball.

[0014] Preferably, a connecting layer with a zigzag cross-section is provided between the filter screen and the vibrating screen. The connecting layer is made of non-woven fabric and has air vents.

[0015] Preferably, the detection probe includes an electrochemical sensor, a catalytic combustion sensor, an infrared sensor, and a semiconductor sensor, and the detection probe is detachably fixed within the arc-shaped mounting frame via the mounting strip.

[0016] Preferably, the linkage mechanism between the pressure application component and the vibration component is realized through the coaxial connection of the rotating rod and the gear, and the negative pressure channel of the air pump and the gas flow path of the guide block are distributed at a preset angle.

[0017] In summary, this application has the following beneficial effects:

[0018] 1. This modular multi-gas detector achieves real-time, accurate, and stable monitoring and early warning of multiple gases (toxic, flammable, oxygen, VOCs, etc.) in complex environments such as sewers through the coordinated operation of active suction, intelligent dynamic filtration, spatially distributed multi-point detection, precise signal processing, efficient linkage self-cleaning, remote data transmission, and threshold alarm.

[0019] 2. An air pump is used to create negative pressure inside the gas detection chamber, allowing external gas to enter through the inlet. The gas then passes through a filter unit and a detection unit within the chamber before exiting through the outlet, achieving a purification process before detection. Pre-detection filtration effectively prevents dust from adhering to the detection unit, eliminating dust interference with the results and ensuring the accuracy and stability of the measurement data. This also prevents interference with subsequent detection operations.

[0020] 3. The filter contains numerous filter fibers evenly distributed within its mesh openings, capable of expanding and contracting. When the filter fibers expand, they occupy more space within the mesh, effectively reducing the airflow path (pore size). This increases the density and surface area of ​​the filter media, thereby improving the capture efficiency of smaller particles (such as PM2.5, fine dust, allergens, etc.). The contraction of the filter fibers physically shakes off or releases particles adhering to the fiber surface. These particles can be removed by reverse airflow or gravity, thus enabling the filter unit to self-clean or be easily regenerated.

[0021] 4. By installing a vibrating screen between the filter screen and the mounting frame for cleaning the filter screen, the fine particles and dust attached to the filter screen can be effectively shaken off through mechanical vibration, thus maintaining the cleanliness of the filter screen.

[0022] 5. The pressure application component and the vibration component work together. Specifically, the bottom of the rotating rod is coaxially fixed with the gear. Driven by the gear, the rotating rod is rotated to achieve the linkage between the pressure application component and the vibration component. This reduces energy efficiency and, driven by a micro motor, cleans the filter and changes its filtration effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the modular multi-gas detector in Embodiment 1.

[0024] Figure 2 This is a schematic diagram of the internal structure of the detection unit in Embodiment 2;

[0025] Figure 3 This is a schematic diagram of the internal partial structure of the filter unit in Embodiment 2;

[0026] Figure 4 This is a schematic diagram of the internal partial structure of the vibration component in Embodiment 2;

[0027] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Sensor module disassembly block; 3. Air inlet; 4. Air outlet; 5. Flow guide block; 6. Air pump; 7. Filter unit; 701. Filter screen; 702. Filter fiber; 703. Pipeline assembly; 704. Airbag; 8. Detection unit; 801. Mounting frame; 802. Mounting strip; 803. Detection probe; 9. Pressure application assembly; 901. Micro motor; 902. Guide rail; 903. Gear; 904. Rack; 905. Pressure plate; 10. Vibration net; 11. Vibration assembly; 1101. Positioning sleeve; 1102. Metal vibration fiber; 1103. Rotating rod; 1104. Eccentric block; 1105. First ball bearing; 1106. Second ball bearing; 12. Connecting layer. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Example 1

[0030] This invention discloses a modular multi-gas detector, such as... Figure 1 As shown, it includes a housing 1, on which a fixing member is provided. The housing 1 is fixed to the inner wall of the sewer by the fixing member, and is used to monitor the gas inside the sewer in real time. The housing 1 has built-in electrochemical sensor, catalytic combustion sensor, infrared sensor and semiconductor sensor.

[0031] Specifically, electrochemical sensors are used to detect toxic gases and oxygen. When the target gas reacts with the electrolyte or electrodes within the sensor, a current signal is generated, the intensity of which is proportional to the gas concentration. Catalytic combustion sensors are primarily used to detect combustible gases. The sensor contains two coils: a measuring coil covered by an active catalyst and an uncovered compensation coil. When combustible gas passes through, it burns on the surface of the measuring coil, causing the coil temperature to rise and resistance to increase, thus generating a bridge imbalance signal related to the gas concentration. Infrared sensors are commonly used to detect carbon dioxide and high concentrations of combustible gases. These gases absorb infrared light of specific wavelengths, and the sensor determines the gas concentration by measuring the degree of infrared light attenuation. Semiconductor sensors are sensitive to a variety of gases, but their selectivity is lower than the previous types; they are often used to monitor volatile organic compounds or as early warning sensors.

[0032] Analog electrical signals (changes in current, voltage, or resistance) generated by electrochemical sensors, catalytic combustion sensors, infrared sensors, and semiconductor sensors are received by the device's microprocessor. The microprocessor converts these analog signals into digital signals and performs necessary calibration, temperature compensation, and linearization to accurately calculate the actual concentrations of various gases.

[0033] The processed gas concentration data can be stored in the device's internal memory for subsequent analysis. More importantly, real-time data can be transmitted to a remote monitoring platform or cloud server via a wireless communication module built into the housing 1.

[0034] When the concentration of any gas exceeds the preset safety threshold, the device will immediately trigger an alarm (audio and visual alarm, and send SMS / email notifications to management personnel or the monitoring center) to remind relevant personnel to take action.

[0035] Example 2

[0036] like Figure 2 As shown, the device also includes a sensor module disassembly block 2 that is detached from the housing 1. The bottom and top of the sensor module disassembly block 2 are respectively provided with an air inlet 3 and an air outlet 4. The air inlet 3, air outlet 4, and gas detection chamber are interconnected. A guide block 5 is provided inside the gas detection chamber of the disassembly block, near the air inlet 3. An air pump 6 is installed inside the guide block 5. The air pump 6 is used to create a negative pressure inside the gas detection chamber, allowing external gas to pass through the air inlet 3 and enter the gas detection chamber. The gas then passes through the filter unit 7 and the detection unit 8 located within the gas detection chamber, and is discharged through the air outlet 4, achieving the effect of purification before detection. By filtering before detection, dust in the gas can be effectively prevented from adhering to the detection unit 8, eliminating interference from dust on the detection results and ensuring the accuracy and stability of the measurement data. This also avoids affecting subsequent detection by the detection unit 8.

[0037] like Figure 2As shown, specifically, the detection unit 8 includes a mounting frame 801 with an arc-shaped cross-section. This arc-shaped frame allows it to better adapt to or surround a curved area, thus achieving more comprehensive coverage of that area. Compared to a planar structure, the arc-shaped design provides a wider contact surface. The mounting frame 801 contains several mounting strips 802, each with a detection probe 803. It's worth noting that the detection probes 803 are the aforementioned electrochemical sensors, catalytic combustion sensors, infrared sensors, and semiconductor sensors. The arrangement of several mounting strips 802 within the arc-shaped frame, and the mounting of multiple detection probes 803 on them, means that the sensors are not concentrated at a single point but are distributed across the entire arc-shaped detection surface. This allows the detection unit 8 to simultaneously sample and monitor at multiple spatial locations, providing more comprehensive spatial information, such as detecting the concentration distribution of specific substances and temperature gradients. Gaps are formed between adjacent mounting strips to allow airflow, ensuring that air can freely flow through the entire detection unit 8 and fully contact each detection probe 803.

[0038] like Figure 2 and Figure 3 As shown, the filter unit 7 includes a filter screen 701 with an arc-shaped cross-section. The arc-shaped design, rather than a planar design, significantly increases the surface area of ​​the filter medium within a limited space. This helps to distribute airflow more evenly, reducing pressure concentration and filtration efficiency loss caused by excessively high local airflow velocities, while simultaneously improving the overall processing capacity of the filter unit 7. The filter screen 701 has several mesh openings for air to pass through. Inside these openings are evenly distributed several filter fibers 702 whose volume can expand and contract. When the filter fibers 702 expand, they occupy more space within the mesh openings, effectively reducing the air passageway (pore size). This increases the density and surface area of ​​the filter medium, thereby improving the capture efficiency of smaller particles (such as PM, fine dust, allergens, etc.).

[0039] like Figure 3 As shown, when the filter fibers 702 retract, they release the space inside the mesh, increasing the air passage. When high-efficiency filtration is not required, the retraction significantly reduces the resistance of airflow through the filter 701, thereby reducing the energy consumption of the air pump 6. Additionally, the retraction of the filter fibers 702 physically shakes off or releases particles adhering to the fiber surface. These particles can be removed by reverse airflow or gravity, thus enabling the filter unit 7 to self-clean or be easily regenerated.

[0040] like Figure 3As shown, the filter fiber 702 is made of silicone, and an air cavity is formed inside the filter fiber 702. This air cavity is connected to an external air bladder 704 via a pipe assembly 703 on the filter screen 701. The air bladder 704 is fixed inside the disassembly block. A pressure application component 9 is located inside the disassembly block, on one side of the air bladder 704. The silicone filter fiber 702 has tiny air cavities designed inside. These air cavities are connected to the external air bladder 704 via the pipe assembly 703 on the filter screen 701. When the pressure application component 9 applies pressure to the air bladder 704 fixed inside the disassembly block, the gas inside the air bladder 704 is compressed. The compressed gas enters the air cavity inside the filter fiber 702 through the pipe assembly 703. The properties of silicone allow it to elastically expand when the internal air cavity is inflated. This expansion changes the shape, volume, and gaps between the filter fibers 702, thereby dynamically adjusting the physical state of the filter medium.

[0041] By controlling the pressure applied to the air bladder 704 by the pressure application component 9, the degree of expansion of the filter fibers 702 can be precisely adjusted. When the fibers expand, the pores between them may become smaller, thereby improving filtration accuracy and enabling the capture of finer particles; conversely, reducing the pressure can increase the pore size to adapt to different filtration needs.

[0042] like Figure 3 As shown, the pressure application component 9 further includes a micro motor 901 and a guide rail 902 fixed inside the disassembly block. The output end of the micro motor 901 is connected to a rotating shaft, and a gear 903 is coaxially connected to the rotating shaft. A rack 904 is meshed with one side of the gear 903. The rack 904 slides in the guide rail 902. A pressure plate 905 is provided at the end of the rack 904. The pressure plate 905 is located on one side of the airbag 704, and the cross-sectional dimension of the pressure plate 905 is larger than that of the airbag 704. By driving the gear 903 through the micro motor 901, the rack 904 is driven to slide back and forth on the guide rail 902 to achieve the function of applying pressure and releasing pressure on the airbag 704.

[0043] like Figure 3 and Figure 4As shown, a vibrating screen 10 for cleaning the filter screen 701 is provided between the filter screen 701 and the mounting frame 801. The vibrating screen 10 is a flexible structure and is fixedly connected to the filter screen 701. A vibration assembly 11 for vibrating the vibrating screen 10 is connected to the vibrating screen 10. The vibration assembly 11 includes a positioning sleeve 1101 fixed in the disassembly block, a metal vibrating fiber 1102 connected to the vibrating screen 10, and a rotating rod 1103 rotatably disposed in the disassembly block. Specifically, an eccentric block 1 is provided on the rotating rod 1103. 104. The positioning sleeve 1101 internally houses a first ball bearing 1105 and a second ball bearing 1106. The first ball bearing 1105 is connected to the metal vibrating fiber 1102, and the second ball bearing 1106 is connected to the first ball bearing 1105 via a spring. The second ball bearing 1106 is located on one side of the eccentric block 1104. Because the rotating rod 1103 has the eccentric block 1104, when the rotating rod 1103 rotates, the eccentric block 1104 periodically approaches and intermittently impacts the second ball bearing 1106. After being impacted by the eccentric block 1104, the second ball bearing 1106 transmits the impact force to the first ball bearing 1105 connected by the spring. The spring acts as a buffer and releases accumulated energy, making the impact more effective. The first ball bearing 1105 is connected to the metal vibrating fiber 1102, and its vibration is directly transmitted to the metal vibrating fiber 1102. The metal vibrating fiber 1102 then drives the flexible vibrating net 10 fixedly connected to it to vibrate. Since the vibrating screen 10 is fixedly connected to the filter screen 701, the vibration is transmitted to the filter screen 701, causing the dust and particles attached to the filter screen 701 to fall off due to the vibration, thereby achieving the purpose of cleaning the filter screen 701.

[0044] Mechanical vibration effectively shakes off fine particles and dust adhering to filter 701, maintaining the cleanliness of filter 701.

[0045] like Figure 3 and Figure 4 As shown, the pressure application component 9 and the vibration component 11 work together. Specifically, the bottom of the rotating rod 1103 is coaxially fixed with the gear 903. Driven by the gear 903, the rotating rod 1103 is rotated to achieve the linkage between the pressure application component 9 and the vibration component 11. This has the effect of reducing energy efficiency. Furthermore, driven by the micro motor 901, it is used to clean the filter screen 701 and change the filtration effect of the filter screen 701.

[0046] like Figure 4As shown, a connecting layer 12 with a zigzag cross-section and made of non-woven fabric is provided in the interlayer between the vibrating screen 10 and the filter screen 701. The connecting layer 12 has air vents inside and is used to connect the vibrating screen 10 and the filter screen 701. The connecting layer 12 acts as a bridge between the vibrating screen 10 and the filter screen 701. Its flexible non-woven fabric material and zigzag structure enable it to effectively receive the cleaning vibration from the vibrating screen 10. The zigzag structure provides a spring-like or buffer-like effect, allowing the vibration to be evenly distributed and transmitted to all parts of the filter screen 701, while avoiding stress concentration and wear that may be caused by rigid connections.

[0047] Working principle: First, when the equipment starts monitoring, the air pump 6 inside the guide block 5 located near the air inlet 3 in the gas detection chamber begins to work. The air pump 6 generates negative pressure in the detection chamber. This negative pressure causes the gas to be tested (such as the mixed gas in the sewer) outside the disassembly block to be drawn into the gas detection chamber through the air inlet 3 at the bottom. The design of the guide block 5 helps to guide the drawn-in airflow more orderly into the subsequent processing stages.

[0048] Then, the inhaled gas first encounters the filter unit 7. The core of the filter unit 7 is a filter screen 701 with an arc-shaped cross-section, the surface of which is covered with mesh holes, and the mesh holes are filled with filter fibers 702 made of silicone and containing air chambers with variable volume.

[0049] The airbag 704 is connected to the air chamber inside the filter fiber 702 through the pipe assembly 703. When the airbag 704 is under pressure, the gas is forced into the air chamber of the filter fiber 702, the silicone fiber expands, occupies more space in the mesh, reduces the effective pore size, and improves the filtration accuracy. It is suitable for high dust environments or when more accurate measurements are required, but the airflow resistance increases.

[0050] When the pressure in the air bladder 704 is released: the gas inside the filter fiber 702 flows back into the air bladder 704, the silicone fiber shrinks inward, increasing the effective pore size and reducing airflow resistance (saving energy consumption of the air pump), making it suitable for environments with low dust or when high flow rates are required. At the same time, the fiber shrinkage action helps to shake off particles adhering to the fiber surface, achieving initial self-cleaning.

[0051] By dynamically adjusting the pressure of the airbag 704, the device can intelligently adapt to different environmental dust concentrations, achieving a balance between ensuring detection accuracy and reducing energy consumption / airflow resistance. The gas, after preliminary filtration, continues to flow through the space between the filter 701 and the mounting frame 801 of the detection unit 8.

[0052] Subsequently, the purified gas flows through the detection unit 8. This unit uses an arc-shaped mounting frame 801, with multiple mounting strips 802 inside, and multiple detection probes 803 distributed on the mounting strips.

[0053] This arc-shaped frame and multi-point probe distribution design allows gas to flow fully through the gaps between adjacent mounting strips and be monitored simultaneously by multiple probes, enabling more comprehensive sampling of the spatial distribution of gas components and reducing the impact of local gas concentration unevenness on measurement results.

[0054] Specifically, the detection probe 803 includes an electrochemical sensor, a catalytic combustion sensor, an infrared sensor, and a semiconductor sensor, which directly contact the flowing gas.

[0055] Electrochemical sensors: These sensors detect the concentration of toxic gases and oxygen by utilizing the change in current generated by the reaction between the target gas and the electrolyte / electrode inside the sensor.

[0056] Catalytic combustion sensor: It uses the change in resistance caused by the combustion of combustible gas on the surface of the measuring coil (generating a bridge imbalance signal) to detect the concentration.

[0057] Infrared sensor: Determines concentration by measuring the degree of absorption and attenuation of infrared light of a specific wavelength by a specific gas.

[0058] Semiconductor sensors: primarily sensitive to volatile organic compounds, utilizing gas adsorption to cause changes in the resistance of semiconductor materials, and are often used for broad-spectrum early warning.

[0059] All electrochemical sensors, catalytic combustion sensors, infrared sensors, and semiconductor sensors sense the characteristics of the gas flowing through it in real time.

[0060] Subsequently, the raw analog signals (current, voltage, resistance changes, etc.) generated by the electrochemical sensor, catalytic combustion sensor, infrared sensor, and semiconductor sensor are transmitted to the device's microprocessor. The microprocessor first converts these analog signals into digital signals.

[0061] Then, errors are corrected based on sensor characteristics and preset parameters, and the influence of ambient temperature changes on sensor readings is eliminated. The sensor output is converted into standard data that is linearly related to gas concentration. The processed signal is then used by a microprocessor to accurately calculate the actual concentration values ​​of various target gases.

[0062] Simultaneously, as the pressure application component 9 operates, the rotating rod 1103 rotates accordingly. The eccentric block 1104 on the rotating rod 1103 periodically impacts the second ball bearing 1106 as it rotates. The impact force is transmitted to the first ball bearing 1105 via a spring. The first ball bearing 1105 drives the connected metal vibrating fiber 1102 to vibrate. The vibration of the metal vibrating fiber 1102 is transmitted to the flexible vibrating mesh 10 (fixedly connected to the filter screen 701). The vibrating mesh 10 transmits the vibration to the entire filter screen 701 (the vibration is effectively diffused through the zigzag nonwoven fabric connecting layer 12), causing dust particles adhering to the filter screen 701 and filter fibers 702 to be shaken off.

[0063] The shaken-off dust is eventually discharged from the air outlet 4 with the airflow. This cleaning mechanism shares the same micro motor 901 drive with the pressure regulation of the airbag 704 of the pressure application component 9, realizing the linkage between dynamic adjustment of the filter 701 state and periodic mechanical cleaning, which greatly reduces system energy consumption and ensures the continuous and efficient operation of the filter 701.

[0064] Finally, the calculated real-time gas concentration data is stored in the device's internal memory for historical retrieval or subsequent analysis.

[0065] More importantly, the device's built-in wireless communication module transmits this real-time data to a remote monitoring platform or cloud server, enabling remote and centralized monitoring. The microprocessor continuously compares the real-time concentrations of various gases with their preset safety thresholds.

[0066] If the concentration of any gas exceeds its threshold, the equipment immediately triggers a local alarm, such as an audible and visual alarm. Simultaneously, an alarm notification is sent to management personnel or the monitoring center via the wireless communication module. The alarm signal alerts relevant personnel to take timely countermeasures (such as evacuation, ventilation, and maintenance) to ensure safety.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modular gas detection device, characterized by, The utility model relates to a sensor module dismounting block, including shell (1), fixed on the shell (1) fixed part and set up in the sensor module dismounting block (2) of shell (1), the sensor module dismounting block (2) has air inlet (3), air outlet (4) and the gas detection cavity of intercommunication air inlet (3) with air outlet (4), the gas detection cavity is provided with guide vane (5) in proper order, the filter unit (7) for dynamic regulation filtering accuracy and detection unit (8), guide vane (5) is provided with the air pump (6) of forming negative pressure in, the filter unit (7) includes the filter fiber (702) of swellable contraction and the pressure assembly (9) of driving filter fiber (702) swellable contraction, The filter fiber (702) of filter unit (7) is fixed on the filter screen (701) with arc-shaped structure, and a vibrating screen (10) for cleaning the filter screen (701) is arranged between the filter screen (701) and the detection unit (8). The detection unit (8) includes an installation frame (801) with arc-shaped structure, a plurality of installation bars (802) longitudinally extending are arranged in the installation frame (801), a plurality of detection probes (803) are fixed on the installation bars (802), and air flow gaps are formed between adjacent installation bars (802). The filter fiber (702) is made of silica gel material and has an air cavity formed therein, the air cavity is communicated with an air bag (704) in the dismounting block through a pipeline assembly (703) arranged on the filter screen (701), and the pressure assembly (9) includes a pressure plate (905) for pressing the air bag (704). The pressure assembly (9) includes a micro motor (901), a gear (903) connected with an output end of the micro motor (901), a rack (904) engaged with the gear (903), and the pressure plate (905) fixed on an end of the rack (904), and the rack (904) is slidingly arranged in a guide rail (902) of the dismounting block. A vibration assembly (11) sharing a power source with the pressure assembly (9) is arranged in the dismounting block, the vibration assembly (11) includes a rotating rod (1103) coaxially fixed with the gear (903), and an eccentric block (1104) is arranged on the rotating rod (1103). The vibration assembly (11) includes metal vibrating fibers (1102) fixed on the vibrating screen (10), a positioning sleeve (1101) arranged in the dismounting block, a first ball (1105), a second ball (1106) and a spring arranged in the positioning sleeve (1101), the second ball (1106) is connected with the first ball (1105) through the spring, and the eccentric block (1104) periodically hits the second ball (1106).

2. The modular gas detection device of claim 1, wherein, An adapter layer (12) with zigzag structure is arranged between the filter screen (701) and the vibrating screen (10), and the adapter layer (12) is made of non-woven fabric and has air holes.

3. The modular gas detection device of claim 2, wherein, The detection probe (803) comprises an electrochemical sensor, a catalytic combustion sensor, an infrared sensor and a semiconductor sensor, and is detachably fixed in the arc-shaped mounting frame (801) through the mounting strip (802).

4. The modular gas detection device of claim 3, wherein, The linkage mechanism of the pressure applying assembly (9) and the vibration assembly (11) is realized through coaxial connection of the rotating rod (1103) and the gear (903), and the negative pressure channel of the air pump (6) and the gas flow path of the flow guide block (5) are distributed at a preset included angle.

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