A marine engine gas leak detection and alarm system

Abstract

The application discloses a kind of marine diesel engine gas leakage detection and alarm system of marine diesel engine gas leakage detection technical field, comprising: at least one acquisition module;The acquisition module includes: gas detector main body and the sealing connector of being arranged in the outer wall of gas detector main body, the outer wall of the pipeline to be installed is connected with installation pipe, the outer wall of the installation pipe is fixedly provided with connecting base, one side of the connecting base is connected with sealing cover, and the sealing cover is equipped with auxiliary gas sensor;Control module, connect acquisition module and alarm module.The closed cavity surrounded by sealing cover, gas detector main body, sealing connector and the outer wall of installation pipe in the acquisition module, and the independent monitoring of methane leakage in closed cavity is combined with auxiliary gas sensor, realizes the double redundancy monitoring of methane concentration in pipeline and the sealing state of detector itself, significantly improves the accuracy and reliability of leakage detection.

Description

Technical Field

[0001] This invention relates to the field of gas leak detection in marine internal combustion engines, and specifically to a gas leak detection and alarm system for marine internal combustion engines. Background Technology

[0002] With the increasing environmental protection requirements for marine power systems, the application of dual-fuel engines and gas engines with natural gas as the main fuel is becoming more and more widespread. In order to ensure the stable and safe operation of the engine, gas detectors are usually installed on the demisting pipeline to detect the methane gas concentration in the crankcase of the gas engine and output an alarm signal before the methane concentration approaches the lower explosive limit so that the operators can deal with it in time. However, the above-mentioned gas detection method for marine internal combustion engines still has the following problems when in use: leakage detection is not performed at the connection between the gas detector and the pipeline. When methane gas leaks at the connection between the gas detector and the pipeline due to vibration, aging of sealing materials, or installation deviation, it will cause methane to leak into the external environment and create a safety hazard. Therefore, we propose a gas leakage detection and alarm system for marine internal combustion engines. Summary of the Invention

[0003] The purpose of this invention is to provide a gas leak detection and alarm system for marine internal combustion engines, which solves the technical problem that existing systems do not detect leaks at the connection between the gas detector and the pipeline, which can cause methane to leak into the external environment and create safety hazards.

[0004] The present invention achieves the above objectives through the following technical solutions: A gas leak detection and alarm system for marine internal combustion engines includes: At least one acquisition module is used to be installed on the pipeline to be installed in the marine internal combustion engine to acquire methane gas concentration data in the pipeline in real time. The acquisition module includes: a gas detector body and a sealing connector disposed on the outer wall of the gas detector body. The outer wall of the pipe to be installed is connected to an installation pipe that is connected to the sealing connector and allows the gas detector body to enter. A connecting base is fixedly sleeved on the outer wall of the installation pipe. A sealing cover is detachably connected to one side of the connecting base. The sealing cover is movably sleeved on the outside of the gas detector body and together with the gas detector body, the sealing connector, the connecting base and the outer wall of the installation pipe, forms a sealed cavity. An auxiliary gas sensor for monitoring whether there is methane in the sealed cavity is provided on the sealing cover. The control module connects the acquisition module and the alarm module. The control module is configured to receive methane gas concentration data and monitoring data sent by the auxiliary gas sensor, and to trigger the alarm module when the methane gas concentration data exceeds a preset threshold and / or when there is methane in the sealed cavity.

[0005] A further improvement is that the control module includes a signal converter connected to the acquisition module and a monitor connected to the signal converter, both of which are housed in a single enclosure.

[0006] A further improvement is that the sealing connector includes a connecting cylinder disposed inside the installation pipe and threadedly connected to the installation pipe, the detection end of the gas detector body passes through the connecting cylinder and extends into the pipe to be installed, the outer wall of the gas detector body is fitted with a plurality of sets of sealing elements for abutting against the inner wall of the connecting cylinder, and the outer wall of the gas detector body is also fitted with a fixing ring, the fixing ring and the end of the connecting cylinder away from the pipe to be installed are detachably connected.

[0007] A further improvement is that the two ends of the connecting cylinder are respectively provided with a first groove and a second groove that are connected to each other. The second groove is located at the end of the connecting cylinder facing the pipe to be installed. The first groove is provided with an annular inflatable sealing bladder. The connecting cylinder wall is provided with an annular air storage cavity. A piston is movably provided at one end of the air storage cavity. The piston is connected to the inner wall of one side of the air storage cavity through an elastic element. An electromagnetic ring that is electrically attracted to the piston is provided on the inner wall of the other side of the air storage cavity. The air storage cavity and the side of the piston are filled with gas. When the auxiliary gas sensor detects methane in the sealed cavity, it sends a signal to the control module. The control module then controls the electromagnetic ring to energize and move the piston to compress the gas in the storage cavity into the inflatable sealing bladder, so that the inflatable sealing bladder expands and contacts the outer wall of the gas detector body for sealing.

[0008] A further improvement is that the sealing connector also includes sealing plates symmetrically hinged to the inner walls on both sides of the second tank. When the gas detector body is inserted, the two sets of sealing plates are pushed and flipped open. Each sealing plate is connected to the inner wall of the second tank through a reset elastic element. When the gas detector body is removed from the second tank, the reset elastic element drives the two sets of sealing plates to reset so as to close the second tank.

[0009] A further improvement is that the fixed ring has a cavity inside, and a connecting block is provided inside the cavity. One end of the connecting block is fixedly connected to the outer wall of the gas detector body. The inner wall of the fixed ring has a corresponding movable opening for the connecting block to move. The connecting block is connected to the inner wall of the cavity through an elastic connector. A locking block is engaged at the end of the connecting block away from the gas detector body. The locking block is located at the output end of the micro telescopic component, and the micro telescopic component is fixed to the inner wall of the cavity. When the micro telescopic component drives the locking block to detach from the connecting block, the elastic connector drives the connecting block to move the gas detector body, so that the gas detector body moves out of the second groove.

[0010] A further improvement is that an arc-shaped component is provided on one side of the sealing plate, and the other end of the arc-shaped component is movably inserted into one end of an arc-shaped seat. The arc-shaped seat is embedded in the inner wall of the second groove. Gas is filled in the arc-shaped seat and on one side of the arc-shaped component. Assembly cavities are provided on both sides of the end of the connecting cylinder facing the pipe to be installed. One end of each assembly cavity is connected to the arc-shaped seat on the corresponding side. A limiting component is movably provided in the assembly cavity. The limiting component is connected to the inner wall of one side of the assembly cavity through an elastic component. An opening is provided on the outer wall of the connecting cylinder for one end of the limiting component to pass through. When the sealing plate flips open, the arc-shaped component squeezes the gas in the arc-shaped seat into the assembly cavity, thereby driving the limiting component to move, so that one end of the limiting component passes through the movable opening and contacts the inner wall of the pipe to be installed.

[0011] A further improvement is that the sealing cover is connected to a methane gas processing device via a pipeline, and a solenoid valve is installed in the pipeline.

[0012] The beneficial effects of this invention are as follows: By acquiring the sealed cavity formed by the sealing cover, the gas detector body, the sealing connector, and the outer wall of the installation pipe in the acquisition module, and combining it with the auxiliary gas sensor to independently monitor methane leakage within the sealed cavity, this invention achieves dual redundant monitoring of the methane concentration inside the pipeline and the sealing status of the detector itself. It can trigger an alarm when the methane concentration in the pipeline exceeds the standard or when a leak occurs at the connection between the gas detector body and the installation pipe, significantly improving the accuracy and reliability of leak detection. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the detection and alarm system structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of a partial structure; Figure 3 This is a cross-sectional view of the acquisition module structure in this invention; Figure 4 For the present invention Figure 3 Enlarged view of structure A in the image; Figure 5 For the present invention Figure 3 Enlarged view of the B structure in the image.

[0014] In the diagram: 100, Pipe to be installed; 101, Installation pipe; 102, Connecting base; 200, Acquisition module; 201, Connecting cylinder; 202, Gas detector body; 203, Fixing ring; 204, First groove; 205, Sealing element; 206, Second groove; 207, Sealing plate; 208, Arc-shaped seat; 209, Reset elastic element; 210, Assembly cavity; 211, Limiting element; 212, Inflatable sealing bladder; 213, Gas storage cavity; 214, Piston; 215, Electromagnetic ring; 216, Elastic connecting element; 217, Locking block; 218, Miniature telescopic element; 219, Connecting block; 220, Auxiliary gas sensor; 221, Discharge pipe; 300, Control module; 301, Housing; 302, Signal converter; 303, Monitor. Detailed Implementation

[0015] 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.

[0016] Example 1 Please see the appendix Figure 1 A gas leak detection and alarm system for marine internal combustion engines, comprising: At least one acquisition module 200 is used to be installed on the pipeline 100 to be installed in the marine internal combustion engine for real-time acquisition of methane gas concentration data in the pipeline 100 to be installed. The aforementioned marine internal combustion engine pipe 100 to be installed is the demisting pipe of the marine internal combustion engine. This demisting pipe is a pipe connected to the crankcase in the marine internal combustion engine, and can also be called the crankcase ventilation pipe. By installing the acquisition module 200 on the demisting pipe, the concentration of methane gas in the crankcase of fuel engines and gas engines can be effectively detected. The acquisition module 200 includes: a gas detector body 202 and a sealing connector disposed on the outer wall of the gas detector body 202. The outer wall of the pipe to be installed 100 is connected to an installation pipe 101 that is connected to the sealing connector and allows the gas detector body 202 to enter. The installation pipe 101 is integrated with the pipe to be installed 100 or the two are welded together to facilitate the installation of the acquisition module 200. A connecting base 102 is fixedly sleeved on the outer wall of the installation pipe 101. The connecting base 102 is annular. A sealing cover is detachably connected to one side of the connecting base 102. The end of the sealing cover that contacts the connecting base 102 is hollow, and the other end is closed. The connecting base 102 and the sealing cover can be detachably connected by components such as buckles. The two can be sealed by a sealing ring. Optionally, the sealing cover is made of a transparent corrosion-resistant material, which will not be described in detail here. The sealing cover is movably sleeved on the outside of the gas detector body 202 and together with the gas detector body 202, the sealing connector, the connecting base 102 and the outer wall of the mounting pipe 101, forms a sealed cavity. In this way, when methane leaks at the connection between the gas detector body 202 and the mounting pipe 101, the leaked gas is effectively blocked and concentrated in the sealed cavity, preventing it from spreading to the external environment and affecting the environment and operators. The sealing cover is equipped with an auxiliary gas sensor 220 for monitoring whether there is methane in the sealed cavity. Optionally, the auxiliary gas sensor 220 in this embodiment can be a methane gas detection sensor. The above method realizes dual monitoring of internal and external leakage risks, which greatly improves the overall safety, reliability and maintainability of the system. The control module 300 is responsible for the unified control of the operation of all electrical components in the system and processing various input and output data. The control module 300 is connected to the acquisition module 200 and the alarm module. The control module 300 is configured to receive methane gas concentration data and monitoring data sent by the auxiliary gas sensor 220, and to trigger the alarm module when the methane gas concentration data exceeds the preset threshold and / or when there is methane in the sealed cavity. The alarm modules mentioned above include, for example, audible and visual alarms.

[0017] Please see the appendix Figure 1 Preferably, the control module 300 in this embodiment includes a signal converter 302 connected to the acquisition module 200 and a monitor 303 connected to the signal converter 302. Both the signal converter 302 and the monitor 303 are housed in a housing 301. Optionally, the gas detector mentioned above is GD-A59-T, the signal converter 302 is RM-59DH (D), and the monitor 303 is an LEL monitor 303; Specifically, the gas detector body 202 outputs an alarm signal before the methane gas concentration data reaches the lower explosion limit (the threshold is preset by the operator). The signal converter 302 converts the methane concentration value detected by the gas detector body 202 into a digital signal and outputs it to the LEL monitor 303. The LEL monitor 303 controls the alarm module to sound an alarm. The auxiliary gas sensor 220 monitors the sealing cover. When methane data is detected, it outputs a signal to the signal converter 302. The signal converter 302 outputs the signal to the LEL monitor 303, which then controls the alarm module to sound an alarm.

[0018] Preferably, the sealing cover of this embodiment is connected to a methane gas treatment device through a pipeline, and a solenoid valve is provided in the pipeline. Optionally, the methane gas treatment device of this embodiment can be a commercially available mature product such as a catalytic oxidation device, a thermal combustion device, or a methane recovery system, which is used to harmlessly decompose or recycle methane that leaks into the sealed cavity. When the auxiliary gas sensor 220 detects methane in the sealed cavity, the control module 300 can automatically open the solenoid valve while triggering the alarm (of course, the solenoid valve can also be manually opened by the operator after receiving the alarm information), and introduce the leaked gas into the methane gas treatment equipment for treatment, thereby realizing the capture and treatment of leaked methane and improving the overall safety of the system.

[0019] Example 2 Please see the appendix Figure 2-5 Based on Embodiment 1, the sealing connector of this embodiment includes a connecting cylinder 201 disposed inside the mounting tube 101 and threadedly connected to the mounting tube 101. That is, the outer wall of the connecting cylinder 201 is provided with an external thread, and the inner wall of the mounting tube 101 is provided with an internal thread that matches it to achieve reliable engagement. The vertical cross section of the connecting cylinder 201 is T-shaped, so that the operator can screw the connecting cylinder 201 in or out with the help of tools or by manual force. While ensuring the connection strength and sealing between the connecting cylinder 201 and the mounting tube 101, the disassembly and assembly process is significantly simplified. Of course, a high-temperature resistant sealing ring can also be embedded at the threaded connection between the two to further block the gas leakage path, which will not be described in detail here. Optionally, the connecting cylinder 201 of this embodiment can be made of 316 stainless steel or Hastelloy, etc. The detection end of the gas detector body 202 passes through the connecting cylinder 201 and extends into the pipeline 100 to be installed. The outer wall of the gas detector body 202 is fitted with several sets of sealing elements 205 for abutting against the inner wall of the connecting cylinder 201. Preferably, the sealing element 205 is a corrosion-resistant and high-temperature resistant rubber sealing ring, such as fluororubber. The sealing element 205 improves the sealing performance of the connection between the gas detector body 202 and the connecting cylinder 201 to prevent methane gas from leaking from the connection between the gas detector body 202 and the connecting cylinder 201. The outer wall of the gas detector body 202 is also fitted with a fixing ring 203. The fixing ring 203 and the end of the connecting cylinder 201 away from the pipeline 100 to be installed are detachably connected. Preferably, the fixing ring 203 and the connecting cylinder 201 are detachably connected by a bolt-like structure. A high-temperature resistant sealing ring can also be embedded at the connection between the two to further block the gas leakage path.

[0020] This system connects the gas detector body 202 to the mounting tube 101 through a sealed connector, which not only provides high sealing performance but also facilitates disassembly and assembly. When maintaining the gas detector body 202 in the later stage, it is only necessary to unscrew the bolt-like structures in the fixing ring 203 and the connecting tube 201.

[0021] Please see the appendix Figure 2-5 Preferably, in this embodiment, the two ends of the connecting cylinder 201 are respectively provided with a first groove 204 and a second groove 206 that are connected to each other. Optionally, as shown in the attached figure... Figure 4 As shown, in this embodiment, the first groove 204 has a T-shaped vertical cross-section, and the second groove 206 has a rectangular cross-section. The transverse section of the first groove 204 is connected to the second groove 206. The second groove 206 is located at the end of the connecting cylinder 201 facing the pipe 100 to be installed. The first groove 204 is provided with an annular inflatable sealing bladder 212, which is made of high-temperature and corrosion-resistant rubber material. An annular gas storage chamber 213 is opened in the wall of the connecting cylinder 201. A piston 214 is movably provided at one end of the gas storage chamber 213. The piston 214 is connected to the inner wall of one side of the gas storage chamber 213 by an elastic element (such as a spring). An electromagnetic ring 215 is provided on the inner wall of the other side of the gas storage chamber 213 to attract the piston 214. The gas storage chamber 213 and the side of the piston 214 are filled with gas (preferably nitrogen). When the auxiliary gas sensor 220 detects methane in the sealed cavity, it sends a signal to the control module 300. The control module 300 controls the electromagnetic ring 215 to be energized and the piston 214 to move, compressing the gas in the gas storage chamber 213 into the inflatable sealing bladder 212, so that the inflatable sealing bladder 212 expands and contacts and seals with the outer wall of the gas detector body 202. Initially, the inner wall of the inflatable sealing bladder 212 may not contact the outer wall of the gas detector body 202. By means of the above method, when methane leakage is detected at the connection between the acquisition module 200 and the installation pipe 101, the expansion of the inflatable sealing bladder 212 adaptively compensates for the gap and wear, reduces further methane leakage, lowers the potential explosion risk and maintenance requirements caused by leakage, and extends the continuous working time and overall service life of the system.

[0022] Please see the appendix Figure 2-5 Preferably, the sealing connector in this embodiment further includes sealing plates 207 symmetrically hinged to the inner walls on both sides of the second groove 206. The two sets of sealing plates 207 are pushed and flipped open when the gas detector body 202 is inserted. Each sealing plate 207 is connected to the inner wall of the second groove 206 through a reset elastic member 209 (such as a spring). Optionally, a convex edge structure is formed on the inner wall of the second groove 206. The convex edge structure is used to limit the sealing plate 207 to open only in one direction and to limit it by contacting one side of the sealing plate 207 when it is in the closed state. The side of the convex edge structure that contacts the sealing plate 207 can also be embedded with a high-temperature resistant rubber sealing strip to significantly improve the sealing performance of the contact position. When the gas detector body 202 is removed from the second groove 206, the reset elastic member 209 drives the two sets of sealing plates 207 to reset and close the second groove 206. In this way, when maintaining the gas detector body 202, the operator unscrews the bolts in the fixing ring 203 and the connecting cylinder 201 and pulls the gas detector body 202 outward. The reset elastic element 209 drives the two sets of sealing plates 207 to automatically rotate and reset, so that the sealing plates 207 fit tightly with the sealing strip on the convex edge structure, thereby reliably sealing the opening of the second groove 206. During the disassembly or maintenance of the gas detector body 202, the methane gas in the pipeline to be installed 100 is completely blocked and will not leak through the connecting cylinder 201. This not only ensures the safety of the operator, but also allows the marine internal combustion engine to maintain the detection equipment without interrupting its operation, greatly improving the safety, reliability and maintenance convenience of the system.

[0023] Preferably, the fixing ring 203 of this embodiment has a cavity inside. Preferably, at least two cavities are provided, respectively on both sides inside the fixing ring 203. A connecting block 219 is provided inside the cavity. One end of the connecting block 219 is fixedly connected to the outer wall of the gas detector body 202. The inner wall of the fixing ring 203 has a corresponding movable opening for the connecting block 219 to move. The connecting block 219 is connected to the inner wall of the cavity through an elastic connector 216. Preferably, the elastic connector 216 includes a guide rod that is parallel to the axis of the connecting cylinder 201 and movably passes through the connecting block 219 and a spring sleeved outside the guide rod. The guide rod movably passes through the connecting block 219 and both ends are fixed to the inner wall of the cavity. One end of the spring is connected to the inner wall of the cavity, and the other end is connected to the connecting block 219. A locking block 217 is attached to the end of the connecting block 219 away from the gas detector body 202. The locking block 217 is located at the output end of the miniature telescopic component 218, which is fixed to the inner wall of the cavity. Optionally, the miniature telescopic component 218 can be a miniature electric telescopic rod, etc. By controlling the movement of the miniature telescopic component 218, the locking block 217 can be engaged with or disengaged from the connecting block 219. When the locking block 217 is engaged with the connecting block 219, the detection end of the gas detector body 202 is stably placed in the pipeline 100 to be installed to perform the monitoring task. When the locking block 217 is disengaged from the connecting block 219, the spring of the elastic connecting component 216 releases potential energy, pulls the connecting block 219, and moves the gas detector body 202, causing its detection end to exit from the second groove 206 into the first groove 204. When a serious leak occurs at the connection between the acquisition module 200 and the installation pipe 101, or when the operator needs to maintain the gas detector body 202, the operator can control the miniature telescopic component 218 through the control module 300. This causes the miniature telescopic component 218 to drive the locking block 217 to disengage from the connecting block 219. Consequently, when the miniature telescopic component 218 drives the locking block 217 to disengage from the connecting block 219, the elastic connecting component 216 drives the connecting block 219 to move the gas detector body 202, allowing the gas detector body 202 to move out of the second groove 206. At this time, the two sets of sealing plates 207 reset to seal the second groove 206, effectively limiting the further development of the leak while improving the safety and efficiency of the maintenance operation, and ensuring the uninterrupted normal operation of the marine internal combustion engine during maintenance.

[0024] Example 3 Please see the appendix Figure 3-5 Based on Embodiment 2, in this embodiment, the sealing plate 207 has an arc-shaped component on one side, and the other end of the arc-shaped component is movably inserted into one end of the arc-shaped seat 208. The arc-shaped seat 208 is embedded in the inner wall of the second groove 206. The arc-shaped component and the arc-shaped seat 208 are coaxial with the hinge joint of the sealing plate 207 and the second groove 206, ensuring that when the sealing plate 207 is flipped, the end of the arc-shaped component can slide smoothly in the arc-shaped seat 208. The arc-shaped seat 208, located on one side of the arc-shaped component, is filled with gas (preferably nitrogen). The connecting cylinder 201 has assembly cavities 210 on both sides of the end facing the pipe 100 to be installed. One end of each assembly cavity 210 is connected to the corresponding side of the arc-shaped seat 208. Preferably, a gas channel is opened in the wall thickness of the connecting cylinder 201 to connect the assembly cavity. One end of cavity 210 and one end of arc-shaped seat 208 are connected. A limiting member 211 is movably provided in the assembly cavity 210. The vertical section of the limiting member 211 is T-shaped. Its horizontal section matches the inner wall of the assembly cavity 210 and can move under the push of gas. The limiting member 211 is connected to the inner wall of one side of the assembly cavity 210 through an elastic member (such as a spring). When the sealing plate 207 is reset, it drives the arc-shaped member to reset, thereby causing the gas in the assembly cavity 210 to flow back to the arc-shaped seat 208. At this time, the elastic member drives the limiting member 211 to reset and retract into the assembly cavity 210. The outer wall of the connecting cylinder 201 is provided with an active opening for one end of the limiting member 211 to pass through. Furthermore, the outer wall of the connecting cylinder 201 is also provided with a vent hole communicating with the assembly cavity 210 so that the limiting member 211 can move under the action of gas. When the sealing plate 207 is flipped open, the arc-shaped component squeezes the gas in the arc-shaped seat 208 into the assembly cavity 210, thereby driving the limiting component 211 to move. One end of the limiting component 211 passes through the movable opening and contacts the inner wall of the pipe 100 to be installed. In this way, the displacement or loosening between the connecting cylinder 201 and the installation pipe 101 caused by external factors such as the vibration of the ship engine can be effectively restricted. This enhances the connection stability and sealing between the connecting cylinder 201 and the installation pipe 101, thereby ensuring the accuracy and reliability of the detection data of the gas detector body 202. At the same time, this structure does not require an external power source. It works when the gas detector body 202 is inserted and is released when the gas detector body 202 is removed, without affecting the removal and maintenance of the connecting cylinder 201.

[0025] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A gas leak detection and alarm system for marine internal combustion engines, characterized in that, include: At least one acquisition module (200) is used to be installed on the pipeline (100) to be installed in the marine internal combustion engine for real-time acquisition of methane gas concentration data in the pipeline (100); The acquisition module (200) includes: a gas detector body (202) and a sealing connector disposed on the outer wall of the gas detector body (202). The outer wall of the pipe to be installed (100) is connected to an installation pipe (101) that is connected to the sealing connector and allows the gas detector body (202) to enter. The outer wall of the installation pipe (101) is fixedly fitted with a connecting base (102). A sealing cover is detachably connected to one side of the connecting base (102). The sealing cover is movably fitted on the outside of the gas detector body (202) and together with the outer wall of the gas detector body (202), the sealing connector, the connecting base (102) and the installation pipe (101) forms a sealed cavity. An auxiliary gas sensor (220) for monitoring whether there is methane in the sealed cavity is provided on the sealing cover. The control module (300) is connected to the acquisition module (200) and the alarm module. The control module (300) is configured to receive methane gas concentration data and monitoring data sent by the auxiliary gas sensor (220), and to trigger the alarm module when the methane gas concentration data exceeds a preset threshold and / or when there is methane in the sealed cavity. The sealing connector includes a connecting cylinder (201) disposed inside the mounting pipe (101) and threadedly connected to the mounting pipe (101). The detection end of the gas detector body (202) passes through the connecting cylinder (201) and extends into the pipe (100) to be installed. The outer wall of the gas detector body (202) is fitted with a plurality of sets of sealing elements (205) for abutting against the inner wall of the connecting cylinder (201). The outer wall of the gas detector body (202) is also fitted with a fixing ring (203). The fixing ring (203) and the end of the connecting cylinder (201) away from the pipe (100) to be installed are detachably connected. The connecting cylinder (201) has a first groove (204) and a second groove (206) that are connected to each other at both ends. The second groove (206) is located at the end of the connecting cylinder (201) facing the pipe (100) to be installed. The first groove (204) is provided with an annular inflatable sealing bladder (212). The connecting cylinder (201) has an annular gas storage chamber (213) in its wall thickness. A piston (214) is movably provided at one end of the gas storage chamber (213). The piston (214) is connected to the inner wall of one side of the gas storage chamber (213) by an elastic element. An electromagnetic ring (215) that is electrically attracted to the piston (214) is provided on the inner wall of the other side of the gas storage chamber (213). The gas storage chamber (213) and the side of the piston (214) are filled with gas. When the auxiliary gas sensor (220) detects methane in the sealed cavity, it sends a signal to the control module (300). The control module (300) controls the electromagnetic ring (215) to be energized and the adsorption piston (214) to move, compressing the gas in the gas storage chamber (213) into the inflatable sealing bladder (212), so that the inflatable sealing bladder (212) expands and contacts and seals the outer wall of the gas detector body (202). The sealing connector also includes sealing plates (207) symmetrically hinged to the inner walls on both sides of the second groove (206). When the gas detector body (202) is inserted, the two sets of sealing plates (207) are pushed and flipped open. Each sealing plate (207) is connected to the inner wall of the second groove (206) through a reset elastic element (209). When the gas detector body (202) is removed from the second groove (206), the reset elastic element (209) drives the two sets of sealing plates (207) to reset and close the second groove (206).

2. The detection and alarm system according to claim 1, characterized in that, The control module (300) includes a signal converter (302) connected to the acquisition module (200) and a monitor (303) connected to the signal converter (302). The signal converter (302) and the monitor (303) are both housed in a box (301).

3. The detection and alarm system according to claim 1, characterized in that, The fixing ring (203) has a cavity inside, and a connecting block (219) is provided inside the cavity. One end of the connecting block (219) is fixedly connected to the outer wall of the gas detector body (202). The inner wall of the fixing ring (203) has a corresponding movable opening for the connecting block (219) to move. The connecting block (219) is connected to the inner wall of the cavity through an elastic connector (216). The end of the connecting block (219) away from the gas detector body (202) is engaged with a locking block (217). The locking block (217) is located at the output end of the miniature telescopic component (218). The miniature telescopic component (218) is fixed to the inner wall of the cavity. When the micro telescopic member (218) drives the locking block (217) to disengage from the connecting block (219), the elastic connector (216) drives the connecting block (219) to move the gas detector body (202) so that the gas detector body (202) is moved out of the second groove (206).

4. The detection and alarm system according to claim 1, characterized in that, The sealing plate (207) has an arc-shaped component on one side, and the other end of the arc-shaped component is movably inserted into one end of the arc-shaped seat (208). The arc-shaped seat (208) is embedded in the inner wall of the second groove (206). The arc-shaped seat (208) and the side of the arc-shaped component are filled with gas. The connecting cylinder (201) has assembly cavities (210) on both sides of the end facing the pipe (100) to be installed. One end of each assembly cavity (210) is connected to the arc-shaped seat (208) on the corresponding side. A limiting component (211) is movably provided in the assembly cavity (210). The limiting component (211) is connected to the inner wall of one side of the assembly cavity (210) by an elastic component. The outer wall of the connecting cylinder (201) has an opening for one end of the limiting component (211) to pass through. When the sealing plate (207) is flipped open, the arc-shaped component squeezes the gas in the arc-shaped seat (208) into the assembly cavity (210), thereby driving the limiting component (211) to move, so that one end of the limiting component (211) passes through the movable opening and contacts the inner wall of the pipe (100) to be installed.

5. The detection and alarm system according to claim 1, characterized in that, The sealing cover is connected to a methane gas processing device via a pipeline, and a solenoid valve is installed inside the pipeline.

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