Tunnel toxic gas monitoring device

Abstract

The utility model belongs to tunnel toxic gas monitoring technical field discloses tunnel toxic gas monitoring devices, including gas monitoring device including a plurality of installation in the tunnel monitoring unit, monitoring unit includes: fixed frame, fixed frame is installed in the tunnel, gas collection structure, gas collection structure includes micro -pneumatic pump, the air inlet end of micro -pneumatic pump is installed with the air inlet pipe of intercommunication, and the exhaust end of micro -pneumatic pump is installed with the exhaust pipe of intercommunication, gas reaction structure, gas reaction structure includes reaction box, and reaction box inside places inflatable capsule and lithium cell, inflatable capsule is linked together with exhaust pipe, and lithium cell is connected with micro -pneumatic pump electrically, and the top of inflatable capsule is installed with guide column, warning light. The utility model discloses the way of combining mechanical trigger design and chemical detection, solved the problem that traditional electronic sensor is easy to be damaged and electromagnetic interference under the environment of humidity, dust, can improve the stability and environmental adaptability of device significantly.

Description

Technical Field

[0001] This utility model relates to the field of tunnel toxic gas monitoring technology, and in particular to a tunnel toxic gas monitoring device. Background Technology

[0002] The tunnel toxic gas monitoring device is a safety monitoring device used to detect the concentration of hazardous gases in the tunnel environment in real time, mainly targeting carbon monoxide (CO), hydrogen sulfide (H2S), and nitrogen oxides (NOx). x Dynamic monitoring of toxic and harmful gases such as methane (CH4) is conducted to prevent safety accidents such as explosions, poisoning, or suffocation caused by excessive gas concentrations.

[0003] With the rapid development of urban underground transportation networks and mountain tunnel construction, tunnel environmental safety issues are becoming increasingly prominent. The enclosed space inside tunnels and poor air circulation easily lead to the accumulation of vehicle exhaust fumes (such as carbon monoxide and nitrogen oxides) and toxic and harmful gases generated during construction (such as methane and hydrogen sulfide). Current tunnel gas monitoring technologies mainly rely on electronic sensors, which have the following problems: 1) Electronic components are easily damaged in the humid and dusty tunnel environment; 2) The detection results are susceptible to electromagnetic interference. Therefore, we proposed a monitoring device for toxic gases in tunnels. Utility Model Content

[0004] In view of the problems of existing tunnel monitoring devices, such as the susceptibility of electronic components to damage in humid and dusty tunnel environments and the susceptibility of detection results to electromagnetic interference, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A tunnel toxic gas monitoring device, comprising multiple monitoring units installed within the tunnel, wherein the monitoring unit includes: A fixing frame, which is installed inside the tunnel; A gas collection structure, comprising a miniature air pump mounted on the bottom of a fixed frame via a fixed base, wherein the air pump has an air inlet pipe connected to it and an air outlet pipe connected to it. A gas reaction structure includes a detachable reaction box mounted on the top of the mounting frame. An expandable bladder and a lithium battery are placed inside the reaction box. The expandable bladder is connected to the exhaust pipe. The lithium battery is electrically connected to the micro gas pump. A guide post is mounted on the top of the expandable bladder. A first conductive contact is mounted on the top of the guide post. The first conductive contact is electrically connected to the lithium battery via a wire. A warning light is installed on the reaction box. A second conductive contact is electrically connected to the bottom of the warning light. When the first conductive contact comes into contact with the second conductive contact, an open circuit is formed, and the warning light illuminates.

[0006] As a technical solution of the tunnel toxic gas monitoring device of this utility model, a gas filter and a selective permeation membrane are installed in the air inlet pipe, and the gas filter and the selective permeation membrane are arranged sequentially along the gas flow direction.

[0007] As a technical solution of the tunnel toxic gas monitoring device of this utility model, the selective permeation membrane is a polymer film with selective permeation capability for specific toxic gases.

[0008] As a technical solution of the tunnel toxic gas monitoring device of the present invention, the reaction box has an integrally formed partition, and the partition divides the reaction box into a first placement area and a second placement area, the expandable bladder is located in the first placement area, and the lithium battery is located in the second placement area.

[0009] As a technical solution of the tunnel toxic gas monitoring device of this utility model, the top of the reaction box is equipped with a guide cylinder that is adapted to and connected to the guide column, and the warning light is installed on the guide cylinder.

[0010] As a technical solution of the tunnel toxic gas monitoring device of this utility model, the expandable bladder is filled with a chemical substance that reacts with the target gas in a volume change reaction.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model solves the problems of traditional electronic sensors being easily damaged in humid and dusty environments and electromagnetic interference by combining mechanical triggering design with chemical detection, and can significantly improve the stability and environmental adaptability of the device.

[0012] 2. This utility model, by adopting a compartmentalized design, a detachable reaction box, and standardized components, can facilitate the quick replacement of faulty parts or the adjustment of the target gas to be detected, while reducing maintenance costs and supporting expansion in multiple scenarios. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the monitoring unit structure of this utility model.

[0014] Figure 2 This is a cross-sectional structural diagram of the monitoring unit of this utility model.

[0015] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0016] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B.

[0017] Explanation of reference numerals in the attached figures: In the diagram: 1. Fixture; 201. Miniature air pump; 202. Air inlet pipe; 2021. Gas filter; 2022. Selective permeation membrane; 203. Exhaust pipe; 3. Reaction box; 301. Partition; 302. Guide tube; 303. Expandable bladder; 304. Guide post; 305. First conductive contact; 4. Lithium battery; 5. Warning light; 501. Second conductive contact. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Reference Figures 1-4 A tunnel toxic gas monitoring device was provided, which includes multiple monitoring units installed inside the tunnel. The monitoring units include: Fixing frame 1 is installed inside the tunnel and fixed to the tunnel sidewall or top with expansion bolts to ensure stability; The gas collection structure includes a miniature air pump 201 (the miniature air pump 201 is waterproof and dustproof and meets the IP65 rating) mounted on the bottom of the mounting frame 1 via a mounting base. The air pump 201 has an air inlet pipe 202 connected to it and an air outlet pipe 203 connected to it. The gas reaction structure includes a detachable reaction box 3 mounted on the top of the fixed frame 1. The reaction box 3 is made of corrosion-resistant plastic (such as ABS). An expandable bladder 303 and a lithium battery 4 are placed inside the reaction box 3. The expandable bladder 303 is connected to the exhaust pipe 203. The lithium battery 4 is electrically connected to the micro air pump 201. A guide post 304 is mounted on the top of the expandable bladder 303. A first conductive contact 305 is mounted on the top of the guide post 304. The first conductive contact 305 is electrically connected to the lithium battery 4 through a wire. Warning light 5 is installed on reaction box 3. A second conductive contact 501 with electrical connection is installed at the bottom of warning light 5. When the first conductive contact 305 contacts the second conductive contact 501, an open circuit is formed and warning light 5 lights up. In application, the physical contact between the first conductive contact 305 and the second conductive contact 501 is triggered by the expandable bladder 303, which can reduce the dependence on electronic sensors, reduce the risk of electronic component failure caused by moisture and dust, avoid electromagnetic interference problems, and improve stability.

[0020] Reference Figure 2 and Figure 3 The inlet pipe 202 is equipped with a gas filter 2021 and a selective permeation membrane 2022, which are arranged sequentially along the gas flow direction. The selective permeation membrane 2022 is a polymer film with selective permeation capability for specific toxic gases (such as polytetrafluoroethylene membrane for hydrogen sulfide detection). In application, the gas filter 2021 intercepts dust particles to protect subsequent components, while the selective permeation membrane 2022 only allows the target gas to enter the reaction chamber 3, which can improve detection accuracy and reduce false alarms.

[0021] Reference Figure 2 and Figure 4 The reaction box 3 has an integrally formed partition 301, which divides the reaction box 3 into a first placement area and a second placement area. The expandable capsule 303 is located in the first placement area, and the lithium battery 4 is located in the second placement area. In application, the partition 301 divides the reaction box 3 into independent areas to prevent the expandable capsule 303 and the lithium battery 4 from interfering with each other, thereby enhancing safety and modular maintenance convenience.

[0022] Reference Figure 2 and Figure 4 The top of the reaction box 3 is equipped with a guide cylinder 302 that is compatible with and connected to the guide post 304, and the warning light 5 is installed on the guide cylinder 302. In application, the guide cylinder 302 cooperates with the guide post 304 to ensure the stability of the contact between the first conductive contact 305 and the second conductive contact 501, and avoid false triggering caused by mechanical deformation or vibration.

[0023] Reference Figure 2 and Figure 4 The expandable capsule 303 is filled with a chemical substance that reacts with the target gas to change volume. In application, the expandable capsule 303 is filled with a chemical substance that reacts with a specific gas (such as a palladium-based material that expands with CO, or a palladium-silica composite material that expands with methane), which can flexibly adapt to different tunnel environment requirements and expand application scenarios.

[0024] The working principle of this utility model is as follows: Installation and start-up: S1. Install fixed frames 1 every 50-100 meters in the tunnel to ensure coverage of high-risk areas (such as ventilation dead corners). S2. Place the reaction box 3 on the mounting frame 1 and connect the exhaust pipe 203 and the power cord of the lithium battery 4. S3. Start the micro air pump 201. The gas is filtered through the air inlet pipe 202 and then pumped into the inflatable bladder 303. Gas monitoring and alarm: Triggering condition: When the target gas (such as CO) penetrates the selective permeation membrane 2022 and enters the expandable capsule 303, the chemical substance expands and pushes the guide column 304 upward, so that the first conductive contact 305 contacts the second conductive contact 501 to form a closed circuit. Alarm response: Warning light 5 illuminates (flashing red light) to warn vehicles entering the tunnel; Maintenance and Replacement: Regular Inspection: Clean the gas filter 2021 of the air intake pipe 202 monthly, and replace the reaction box 3 every 3-6 months (the replacement period can be determined according to the expiration date of the chemical substances). Troubleshooting: If warning light 5 is abnormal, check if guide post 304 is stuck or conductive contact is oxidized. If necessary, replace reaction box 3.

[0025] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A toxic gas monitoring device for tunnels, characterized in that: The gas monitoring device includes multiple monitoring units installed inside the tunnel, and the monitoring units include: A fixing frame (1) is installed inside the tunnel; A gas collection structure, the gas collection structure includes a miniature air pump (201) mounted on the bottom of the fixed frame (1) via a fixed base, the air pump (201) has an air inlet pipe (202) connected to it at the air inlet end, and an air outlet pipe (203) connected to it at the air outlet end. A gas reaction structure includes a detachable reaction box (3) mounted on the top of the fixed frame (1). An expandable bladder (303) and a lithium battery (4) are placed inside the reaction box (3). The expandable bladder (303) is connected to the exhaust pipe (203). The lithium battery (4) is electrically connected to the micro air pump (201). A guide post (304) is mounted on the top of the expandable bladder (303). A first conductive contact (305) is mounted on the top of the guide post (304). The first conductive contact (305) is electrically connected to the lithium battery (4) through a wire. Warning light (5), the warning light (5) is installed on the reaction box (3), and a second conductive contact (501) electrically connected is installed at the bottom of the warning light (5). When the first conductive contact (305) contacts the second conductive contact (501), an open circuit is formed and the warning light (5) lights up.

2. The tunnel toxic gas monitoring device according to claim 1, characterized in that: The air inlet pipe (202) is equipped with a gas filter (2021) and a selective permeation membrane (2022), and the gas filter (2021) and the selective permeation membrane (2022) are arranged sequentially along the gas flow direction.

3. The tunnel toxic gas monitoring device according to claim 2, characterized in that: The selective permeation membrane (2022) is a polymer film that has selective permeation capability for specific toxic gases.

4. The tunnel toxic gas monitoring device according to claim 1, characterized in that: The reaction box (3) has an integrally formed partition (301), and the partition (301) divides the reaction box (3) into a first placement area and a second placement area. The expandable capsule (303) is located in the first placement area, and the lithium battery (4) is located in the second placement area.

5. The tunnel toxic gas monitoring device according to claim 1, characterized in that: The top of the reaction box (3) is equipped with a guide cylinder (302) that is compatible with and connected to the guide column (304), and the warning light (5) is installed on the guide cylinder (302).

6. The tunnel toxic gas monitoring device according to claim 3, characterized in that: The expandable capsule (303) is filled with a chemical substance that reacts with the target gas in a volume change manner.

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