A gas leakage monitoring alarm

Abstract

The application discloses a kind of gas leak monitoring alarm in gas detection technical field, including detection box, the surface of detection box is connected with natural gas detector, the detection box includes the box body connected in the lower end of natural gas detector, the upper and lower ends of the box body are all set to open, the lower end of natural gas detector is connected in the upper end opening of box body and the upper end opening of box body is sealed, the lower end opening of the box body is connected with box cover plate, the connecting shaft is inserted in the box cover plate, the sealing plate is connected on the connecting shaft, the air in the detection environment can be flowed to the detection box by the setting of detection box, so that the natural gas content in air is detected in the smaller space in detection box, since detection space becomes smaller, only a small amount of natural gas in proportion, natural gas detector can quickly determine whether natural gas leaks, to improve detection efficiency, ensure user safety.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically a gas leak monitoring alarm. Background Technology

[0002] A search revealed Chinese patent number CN201110130876.4, which discloses a centralized residential gas leak monitoring and alarm device. This device includes a detection pipeline, a pipeline ventilation device, residential end-users, and a central monitoring device. Its key features are: connecting each residential end-user to the central monitoring device via the detection pipeline; transporting the gas to be tested from each end-user's home to the central detection point for detection and processing via the pipeline; determining the leak location based on changes in gas concentration and the control and logic judgment of the main control chip; and ensuring that each residential end-user is equipped with a central control signal receiving and processing module, a gas delivery control module, and an alarm module. The central monitoring device includes a ventilation device installed at the end of the monitoring pipeline, a gas detection sensor, and a centralized control module.

[0003] The beneficial effects of the above-mentioned device are: it greatly reduces the initial investment and maintenance costs for individual households using gas detection and alarm systems; it effectively improves the reliability and accuracy of gas leak monitoring; and it facilitates the professional maintenance and management of the monitoring and alarm system, enabling timely detection and effective handling of problems.

[0004] However, in practical applications, existing gas leak monitoring and alarm devices have relatively limited functions, which means they can only detect gas leaks after they occur. Furthermore, when the detection area is large, it often takes a long time for the gas leak to detect the abnormal gas content in the air and issue an alarm, leaving users with little time for emergency response. Therefore, we propose a gas leak monitoring and alarm device. Summary of the Invention

[0005] The purpose of this invention is to provide a gas leak monitoring alarm to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gas leak monitoring alarm, comprising a detection box, a natural gas detector connected to the surface of the detection box, the detection box including a housing connected to the lower end of the natural gas detector, both the upper and lower ends of the housing being open, the lower end of the natural gas detector being connected to the upper opening of the housing and sealing the upper opening of the housing, a cover plate connected to the lower opening of the housing, a connecting shaft inserted into the cover plate, a sealing plate connected to the connecting shaft, the cover plate and the sealing plate being used to seal the lower opening of the housing, the surface of the cover plate... A through-hole is provided on one side of the connecting shaft, which is inserted into the through-hole. A synchronous gear is connected to the surface of the connecting shaft within the through-hole. A limit rod is connected to the inner wall of the housing above the through-hole. A slidable rack is fitted onto the surface of the through-hole. A limit slider is connected to the surface of the rack and fits onto the limit rod, allowing the rack to slide back and forth on the surface of the limit rod. The lower end of the rack meshes with the synchronous gear. An electric telescopic rod is connected to the surface of the housing cover. A connecting block is connected to the piston rod of the electric telescopic rod and is connected to the rack.

[0007] Preferably, at least one set of connecting shafts is inserted into the box cover plate, and each connecting shaft is connected to a sealing plate. The multiple sets of sealing plates are linearly distributed at equal distances. Sealing strips are provided on both sides of the sealing plate. A gap is left between two adjacent sets of sealing plates, and the size of the gap is adapted to the size of the two sets of sealing strips connected to the surfaces of the two sets of sealing plates. The number of through holes on the box cover plate corresponds to the number of connecting shafts.

[0008] Preferably, the surface of the through-hole is connected with a sealing gasket located on both sides of the upper end of the synchronous gear, and the sealing gasket abuts against the surface of the synchronous gear.

[0009] Preferably, the side of the housing is provided with a ventilation opening, a hinge shaft is hinged inside the ventilation opening, a sealing baffle is connected to the surface of the hinge shaft and located inside the ventilation opening, the size of the ventilation opening and the size of the sealing baffle are adapted to each other, a protruding plate is connected to the surface of the sealing baffle, a fixed shaft is inserted into the protruding plate, an electric telescopic rod two is connected to the inner wall of the housing and located above the sealing baffle, a hinge block is connected to the piston rod of the electric telescopic rod two, the hinge block is hinged to the fixed shaft, and a ventilation pipe is connected to the surface of the housing outside the ventilation opening.

[0010] Preferably, the ventilation duct includes a ventilation duct body connected to the housing, a fixed head connected to the end of the ventilation duct body away from the detection housing, a drive shaft A inserted inside the fixed head, a fan blade A connected to one end of the drive shaft A, a motor connected to the surface of the ventilation duct body, the output shaft of the motor being drivenly connected to the drive shaft A, a fixed seat connected to the inner wall of the ventilation duct body, a drive shaft B inserted inside the fixed seat, the drive shaft B being perpendicularly connected to the drive shaft A, a fan blade B connected to the lower end of the drive shaft B, and a bevel gear B connected to the upper end of the drive shaft B, which meshes with the bevel gear A connected to the surface of the drive shaft A.

[0011] Preferably, a filter screen is connected to the outdoor opening of the ventilation duct.

[0012] Preferably, a vent is provided on the back of the box, a solenoid valve is connected inside the vent, a connecting pipe is connected to the solenoid valve, and a pipe plug is connected to the other end of the connecting pipe. The pipe plug is connected to the inside of the test box.

[0013] Preferably, the pipe plug includes a plug head A connected to the connecting pipe. The plug head A is annular, and both sides of the plug head A are provided with protrusions. The protrusions are provided with threaded holes and connected to a plug head B by fixing bolts. The plug head B is also annular.

[0014] Preferably, a sealing sleeve A is connected to the inner wall of the sealing head A, and a sealing sleeve B is connected to the inner wall of the sealing head B. The sealing head A and the sealing sleeve A are provided with a communication port that completely penetrates into the connecting pipe, and a vent groove is provided at the center of the surface of the sealing sleeve A and the sealing sleeve B.

[0015] Preferably, the upper and lower surfaces of the sealing head A are provided with slots A, and a sealing airbag is connected in the slot A. The sealing airbag is connected to the connecting pipe through an air supply pipe. The surface of the sealing head B is provided with slots B that are compatible with slots A. A limiting plate is provided on the surface of the sealing head B outside the slots B.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This solution, through the setting of the detection box, allows air from the detection environment to flow into the detection box, enabling the detection of natural gas content in the air within a small space. Because the detection space is smaller, only a small amount of natural gas in the same proportion is needed for the natural gas detector to quickly determine whether there is a natural gas leak, thereby improving detection efficiency and ensuring user safety.

[0018] 2. This solution, through the installation of ventilation ducts, allows the natural gas detector to quickly operate through the ventilation ducts after detecting a natural gas leak, thereby expelling the air in the detection space and further reducing the natural gas content in the detection space. This extends the time before a natural gas accident occurs, giving users sufficient reaction time after being notified of the leak, and further effectively protecting the safety of users' lives and property.

[0019] 3. This solution utilizes a pipe plug to seal the gas pipe connection, preventing gas leaks. During the sealing process, if a leak occurs, the natural gas detector will quickly detect it and alert the user, allowing for rapid location of the leak. Furthermore, when a gas leak occurs, the pipe plug forms a ring around the connection, creating a temporary seal. This delays the user's ability to address the leak quickly, extending their emergency response time, reducing property damage, and ensuring personal safety. Attached Figure Description

[0020] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a rear view schematic diagram of the structure of the present invention;

[0022] Figure 3 This is a bottom view of the structure of the present invention;

[0023] Figure 4 This is a frontal cross-sectional view of the internal structure of the detection box of the present invention;

[0024] Figure 5 This is a rear cross-sectional view of the internal structure of the detection box of the present invention;

[0025] Figure 6 This is a top sectional view of the internal structure of the detection box of the present invention;

[0026] Figure 7 This is a schematic diagram of the ventilation duct structure of the present invention;

[0027] Figure 8 This is an exploded view of the pipe plugging device structure of the present invention;

[0028] Figure 9 This is a schematic diagram of a portion of the pipe plugging device of the present invention;

[0029] Figure 10 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0030] In the diagram: 1. Detection box; 101. Box body; 102. Box cover; 103. Connecting shaft; 104. Sealing plate; 105. Sealing strip; 106. Through-hole; 107. Solenoid valve; 108. Synchronous gear; 109. Limiting rod; 110. Rack; 111. Limiting slider; 112. Electric telescopic rod one; 113. Connecting block; 114. Sealing gasket; 115. Vent; 116. Hinge shaft; 117. Sealing baffle; 118. Vent; 119. Electric telescopic rod two; 120. Protruding plate; 121. Fixed shaft; 122. Hinge block; 2. Natural gas detector; 3. Connecting pipe; 4. Pipeline plug. ; 401, Sealing head A; 402, Protrusion; 403, Fixing bolt; 404, Sealing head B; 405, Sealing sleeve A; 406, Sealing sleeve B; 407, Ventilation groove; 408, Connecting port; 409, Slot A; 410, Sealing airbag; 411, Air supply pipe; 412, Slot B; 413, Limiting plate; 5, Ventilation pipe; 501, Ventilation pipe body; 502, Fixing head; 503, Drive shaft A; 504, Fan blade A; 505, Motor; 506, Fixing seat; 507, Drive shaft B; 508, Fan blade B; 509, Conical drive gear B; 510, Conical drive gear A; 511, Filter screen. Detailed Implementation

[0031] Example 1

[0032] Please see Figure 1-10 The present invention provides a technical solution:

[0033] A gas leak monitoring alarm includes a natural gas detector 2 installed on the surface of a detection box 1. The lower end of the detection box 1 is open, allowing air from the detection environment to circulate into the detection box 1. The natural gas detector 2 can detect the natural gas content in the air inside the detection box 1 to determine whether there is a natural gas leak. The natural gas detector 2 has a built-in alarm that will sound an alarm to alert the user when a natural gas leak occurs.

[0034] The testing box 1 includes a box body 101 connected to the lower end of the natural gas detector 2. Both the upper and lower ends of the box body 101 are open. The lower end of the natural gas detector 2 is connected to the upper opening of the box body 101 and seals the upper opening of the box body 101, so that the natural gas detector 2 can detect the natural gas content in the air inside the box body 101 and avoid inaccurate test results caused by air flow during the test.

[0035] The lower end of the housing 101 is designed as an opening to facilitate the entry of external air. A cover plate 102 is connected to the lower opening of the housing 101. At least one set of connecting shafts 103 are inserted into the cover plate 102, and a sealing plate 104 is connected to the connecting shafts 103. This allows the sealing plate 104 to rotate on the cover plate 102 via the connecting shafts 103. When the sealing plate 104 rotates parallel to the cover plate 102, it seals the lower opening of the housing 101 with the cover plate 102. This further allows air to flow into the housing 101 and then be sealed by the connecting shafts 103. This also allows the natural gas detector 2 to quickly detect the natural gas content in the air inside the housing 101. Compared to detecting natural gas leaks in a larger space, which requires a higher natural gas content, detection inside the housing 1 requires only a small, proportional amount of natural gas to quickly determine if a leak has occurred, thus improving detection efficiency and ensuring user safety.

[0036] Furthermore, sealing strips 105 are provided on both sides of the sealing plate 104, so that the sealing strips 105 can seal the gap at the connection between the sealing plate 104 and the box 101, further improving the sealing performance inside the box 101 and preventing air circulation during the testing process, which could lead to inaccurate test results.

[0037] When multiple sets of sealing plates 104 are hinged to the cover plate 102, the multiple sets of sealing plates 104 are linearly distributed at equal distances and rotate synchronously with each other. This further ensures that the multiple sets of sealing plates 104 can always seal the opening below the box body 101 after rotating parallel. There is a gap between two adjacent sets of sealing plates 104, and the size of the gap is adapted to the size of the two sets of sealing strips 105 connected to the surfaces of the two sets of sealing plates 104. This further ensures that the sealing strips 105 can always achieve effective sealing when they abut against each other after rotating parallel.

[0038] The surface of the box cover 102 has a through-hole 106 located on one side of the connecting shaft 103, and the connecting shaft 103 is inserted into the through-hole 106. A synchronous gear 108 is connected to the surface of the connecting shaft 103 and is located within the through-hole 106, allowing the through-hole 106 and the sealing plate 104 to rotate synchronously on the connecting shaft 103. A limit rod 109 is connected to the inner wall of the box body 101 above the through-hole 106, and a slidable rack 110 is fitted onto the surface of the through-hole 106. The rack 110 is fitted onto the limit rod 109 via a limit slider 111 connected to its surface, further allowing the rack 110 to slide back and forth on the surface of the limit rod 109. The lower end of the rack 110 meshes with the synchronous gear 108, causing the rack 110 to drive the synchronous gear 108 to rotate during its sliding motion on the surface of the limit rod 109, further enabling the sealing plate 104 to rotate synchronously on the box cover 102. The rotation of the valve 2 controls the opening and closing of the opening below the box 101. An electric telescopic rod 112 is connected to the surface of the box cover 102. A connecting block 113 is connected to the piston rod of the electric telescopic rod 112, and the connecting block 113 is connected to the rack 110. The operation of the electric telescopic rod 112 drives the piston rod to extend and retract, so that the piston rod drives the connecting block 113 to push the rack 110 to slide, which in turn drives the sealing plate 104 to rotate. When the natural gas detector 2 needs to detect the natural gas content in the air, the electric telescopic rod 112 drives the sealing plate 104 to rotate so that it is perpendicular to the box cover 102, which further allows air to flow into the box 101 for detection by the natural gas detector 2. During the detection process, the electric telescopic rod 112 drives the sealing plate 104 to rotate so that it is parallel to the box cover 102, sealing the inside of the box 101 and improving the detection effect.

[0039] If multiple sets of sealing plates 104 are installed on the cover plate 102 at the same time, the surface of the connecting shaft 103 of each set of sealing plates 104 is connected to a synchronous gear 108, and the cover plate 102 is provided with a corresponding number of through holes 106, so that the rack 110 can mesh with multiple sets of synchronous gears 108 at the same time, thereby driving multiple sets of sealing plates 104 to rotate synchronously, realizing the opening and closing of the detection box 1;

[0040] A sealing gasket 114 is connected to the surface of the through-hole 106 and is located on both sides of the upper end of the synchronous gear 108. The sealing gasket 114 abuts against the surface of the synchronous gear 108, so that the sealing gasket 114 can seal the gap between the synchronous gear 108 and the through-hole 106, thereby improving the sealing performance of the housing 101.

[0041] A vent 115 is provided on the side of the housing 101, and a hinge shaft 116 is hinged inside the vent 115. A sealing baffle 117 is connected to the surface of the hinge shaft 116 and is located inside the vent 115. The size of the vent 115 and the size of the sealing baffle 117 are matched so that when the sealing baffle 117 rotates vertically inside the hinge shaft 116, it seals the vent 115. When the sealing baffle 117 rotates parallel on the hinge shaft 116, the vent 115 can be opened. A ventilation pipe 5 is connected to the surface of the housing 101 outside the vent 115. Air can circulate inside the detection box 1 through the ventilation pipe 5. When the natural gas detector 2 detects a natural gas leak in the environment, the natural gas in the environment can be quickly discharged to the outdoors through the ventilation pipe 5, reducing the natural gas content in the detection environment and further extending the time before an accident occurs, thus giving the user enough time to stop the natural gas leak.

[0042] Furthermore, an electric telescopic rod 119 is connected to the inner wall of the housing 101, located above the sealing baffle 117. A hinge block 122 is connected to the piston rod of the electric telescopic rod 119, and a protruding plate 120 is connected to the surface of the sealing baffle 117. A fixed shaft 121 is inserted into the protruding plate 120, and the hinge block 122 is hinged to the fixed shaft 121. During the extension and retraction of the piston rod driven by the electric telescopic rod 119, the hinge block 122 can drive the sealing baffle 117 to rotate on the hinge shaft 116, thereby further realizing the sealing and opening / closing of the vent 115 by the sealing baffle 117.

[0043] The ventilation duct 5 includes a ventilation duct body 501 connected to the housing 101, and a fixing head 502 is connected to the end of the ventilation duct body 501 away from the detection housing 1. The ventilation duct body 501 can be fixed to the ventilation opening of the building wall through the fixing head 502, and the outer end of the ventilation duct body 501 extends into the building, so that the ventilation duct 5 can connect the detection environment with the outdoors, and further allow the air in the detection environment to be discharged through the ventilation duct 5.

[0044] A drive shaft A503 is inserted inside the fixed head 502, and one end of the drive shaft A503 is connected to a fan blade A504. A motor 505 is connected to the surface of the ventilation duct 501. The output shaft of the motor 505 is connected to the drive shaft A503, so that the motor 505 can drive the fan blade A504 to rotate, which in turn causes the fan blade A504 to drive the air circulation in the ventilation duct 501. By changing the rotation direction of the fan blade A504 driven by the motor 505, the air circulation direction in the ventilation duct 501 can be controlled. When the air in the ventilation duct 501 flows outward, it can draw in air from the detection environment through the detection box 1, making the air content in the detection box 1 the same as the air content in the detection environment, thus improving the accuracy of the detection results of the natural gas detector 2. When the natural gas detector 2 detects a natural gas leak, it can quickly expel the air from the detection environment through the ventilation duct 5, thereby reducing the air content in the detection environment and extending the user's response time.

[0045] A fixed seat 506 is connected to the inner wall of the ventilation duct 501, and a drive shaft B507 is inserted into the fixed seat 506. The drive shaft B507 is perpendicularly connected to the drive shaft A503. The lower end of the drive shaft B507 is connected to a fan blade B508, and the upper end of the drive shaft B507 is connected to a bevel gear B509, which meshes with a bevel gear A510 connected to the surface of the drive shaft A503. This allows the motor 505 to drive the drive shaft A503 to rotate the fan blade A504. The meshing of the bevel gear A510 and the bevel gear B509 can control the drive shaft B507 to drive the fan blade B508 to rotate simultaneously. The fan blades A504 and B508 are located in two perpendicular sections inside the ventilation duct 501, making the airflow inside the ventilation duct 501 smoother and faster, and accelerating the emission efficiency of natural gas in the detection environment.

[0046] A filter screen 511 is connected to the outdoor opening of the ventilation duct 501 to provide dust protection for the inside of the ventilation duct 501.

[0047] The back of the housing 101 is provided with at least one set of vents 118, and a solenoid valve 107 is connected inside the vent 118. The connecting pipe 3 is connected to the solenoid valve 107, so that the pipe plug 4 is connected to the inside of the detection box 1 through the connecting pipe 3.

[0048] The pipeline plug 4 includes a plug head A401 connected to the connecting pipe 3. The plug head A401 is annular and can wrap around the surface of the gas pipeline. Both sides of the plug head A401 are provided with protrusions 402, and the protrusions 402 are provided with threaded holes. The plug head B404 is connected to the protrusions 402 by fixing bolts 403. The plug head B404 is also annular. After the protrusions 402 and the plug head B404 are connected and combined, they can wrap around the surface of the gas pipeline. This allows the pipeline plug 4 to wrap around the gas pipeline connection and seal the gas pipeline connection to prevent natural gas leakage.

[0049] A sealing sleeve A405 is connected to the inner wall of the sealing head A401, and a sealing sleeve B406 is connected to the inner wall of the sealing head B404. When the sealing head A401 and the sealing head B404 seal the gas pipe connection, the sealing sleeves A405 and B406 wrap around the outside of the gas pipe connection, further improving the sealing performance.

[0050] Furthermore, the plugging head A401 and the sealing sleeve A405 are provided with a fully penetrating connecting port 408, which further allows the plugging head A401 and the plugging head B404 to wrap the gas pipe connection. When a gas leak occurs at the gas pipe connection, the gas will enter the connecting pipe 3 through the connecting port 408, and then enter the detection box 1 through the connecting pipe 3. This allows the natural gas detector 2 to detect the gas leak at the gas pipe wrapped by the pipe plug 4, and further remind the user.

[0051] Furthermore, the housing 101 is equipped with multiple vents 118, and each of the solenoid valves 107 on the multiple vents 118 is connected to a connecting pipe 3, so that each of the multiple pipe plugs 4 corresponds to a different gas pipe. The multiple pipe plugs 4 are wrapped around different gas pipes. When the corresponding gas pipe leaks, the leaking gas will flow into the detection box 1 from the corresponding solenoid valve 107, which further enables the natural gas detector 2 to accurately locate the gas pipe that is leaking natural gas, thereby more accurately locating which gas pipe is leaking, thus improving the accuracy and efficiency of the user in stopping gas leaks.

[0052] Both sealing sleeves A405 and B406 have vent grooves 407 at their center positions. This allows the leaked natural gas to enter the connection port 408 through the vent grooves 407 when the gas pipe is leaking due to aging, even if the sealing sleeves A405 and B406 are tightly wrapped around it. This allows the leaked natural gas to be detected by the natural gas detector 2, thereby improving the accuracy of the device in detecting natural gas leaks.

[0053] The upper and lower surfaces of the sealing head A401 are provided with slots A409, and a sealing airbag 410 is connected inside the slot A409. The sealing airbag 410 is connected to the connecting pipe 3 through the air supply pipe 411. When the motor 505 drives the fan blade A504 to rotate and controls the air to flow inward in the ventilation pipe 501, the sealing airbag 410 can be inflated through the connecting pipe 3, which further causes the sealing airbag 410 to expand after being inflated.

[0054] The surface of the plugging head B404 is provided with grooves B412 and A409 for compatibility. This allows the plugging heads A401 and B404 to connect. When the natural gas detector 2 detects a natural gas leak in the gas pipe encased within the pipe plugger 4, the ventilation pipe 5 inflates the sealing bladder 410, causing it to expand and press tightly against the gas pipe surface, thus sealing the gas pipe connection. A limit plate is provided on the surface of the plugging head B404 outside the groove B412. 413 ensures that after the sealing head B404 and sealing head A401 are connected and fixed, the limiting plate 413 just covers the outer surface of the slot A409 and slot B412. This ensures that the sealing airbag 410, after expanding, remains within the slot A409 and slot B412, forming a ring around the outside of the gas pipe connection, creating a new temporary enclosure. This prevents the user from taking immediate action after noticing a gas pipe leak, prolonging the time before the leak occurs, thus increasing the user's emergency response time, further reducing property damage, and ensuring life safety.

Claims

1. A gas leakage monitoring alarm, comprising a detection box (1), a natural gas detector (2) is connected to the surface of the detection box (1), characterized in that: The detection box (1) includes a box body (101) connected to the lower end of the natural gas detector (2), the upper and lower ends of the box body (101) are provided in an open shape, the lower end of the natural gas detector (2) is connected to the upper end opening of the box body (101) and seals the upper end opening of the box body (101), the lower end opening of the box body (101) is connected with a box cover plate (102), the box cover plate (102) is provided with a connecting shaft (103) inserted therein, the connecting shaft (103) is connected with a sealing plate (104), the box cover plate (102) and the sealing plate (104) are used for sealing the lower end opening of the box body (101), the surface of the box cover plate (102) is provided with a through hole (106) located on one side of the connecting shaft (103), the connecting shaft (103) is inserted in the through hole (106), the surface of the connecting shaft (103) is connected with a synchronous gear (108) located in the through hole (106), the inner wall of the box body (101) is connected with a limiting rod (109) located above the through hole (106), the surface of the through hole (106) is sleeved with a rack (110) which can slide, the surface of the rack (110) is connected with a limiting sliding block (111) sleeved on the limiting rod (109), so that the rack (110) can reciprocate on the surface of the limiting rod (109), the lower end surface of the rack (110) is engaged with the synchronous gear (108), the surface of the box cover plate (102) is connected with an electric telescopic rod (112), the piston rod of the electric telescopic rod (112) is connected with a connecting block (113), and the connecting block (113) is connected to the rack (110).

2. A gas leakage monitoring alarm as claimed in claim 1, wherein: The box cover plate (102) is inserted with at least one group of connecting shafts (103), the connecting shafts (103) are all connected with sealing plates (104), a plurality of groups of the sealing plates (104) are linearly distributed at equal distances, the surfaces of the two sides of the sealing plate (104) are both provided with sealing strips (105), gaps are left between two adjacent groups of the sealing plates (104), and the gap size is matched with the size of the two groups of sealing strips (105) connected to the surfaces of the two groups of sealing plates (104).

3. A gas leakage monitoring alarm as claimed in claim 1 wherein: The surface of the through hole (106) is connected with a sealing gasket (114) located on the upper end of the two sides of the synchronous gear (108), and the sealing gasket (114) abuts against the surface of the synchronous gear (108).

4. A gas leakage monitoring alarm as claimed in claim 1, wherein: The side of the box (101) is provided with a ventilation opening (115), the ventilation opening (115) is hinged with a hinge shaft (116), the surface of the hinge shaft (116) is connected with a sealing baffle (117) located in the ventilation opening (115), the size of the ventilation opening (115) and the size of the sealing baffle (117) are matched, the surface of the sealing baffle (117) is connected with a lug plate (120), the lug plate (120) is inserted with a fixed shaft (121), the inner wall of the box (101) is connected with an electric telescopic rod two (119) located above the sealing baffle (117), the piston rod of the electric telescopic rod two (119) is connected with a hinge block (122), the hinge block (122) is hinged on the fixed shaft (121), the surface of the box (101) is connected with a ventilation pipe (5) outside the ventilation opening (115).

5. A gas leak monitoring alarm as claimed in claim 4, wherein: The ventilation pipe (5) includes a ventilation pipe body (501) connected to the box (101), one end of the ventilation pipe body (501) away from the detection box (1) is connected with a fixed head (502), the inside of the fixed head (502) is inserted with a transmission shaft A (503), one end of the transmission shaft A (503) is connected with a fan blade A (504), the surface of the ventilation pipe body (501) is connected with a motor (505), the output shaft of the motor (505) and the transmission shaft A (503) are in transmission connection, the inner wall of the ventilation pipe body (501) is connected with a fixed seat (506), the fixed seat (506) is inserted with a transmission shaft B (507), the transmission shaft B (507) and the transmission shaft A (503) are connected vertically, the lower end of the transmission shaft B (507) is connected with a fan blade B (508), the upper end of the transmission shaft B (507) is connected with a conical transmission gear B (509) and a conical transmission gear A (510) meshed connected with the surface of the transmission shaft A (503).

6. A gas leak monitoring alarm according to claim 5, wherein: The outdoor opening of the ventilation pipe body (501) is connected with a filter screen (511).

7. A gas leakage monitoring alarm as claimed in claim 1, wherein: The back of the box (101) is provided with a breathable port (118), the breathable port (118) is connected with a solenoid valve (107), the solenoid valve (107) is connected with a connecting pipe (3), the other end of the connecting pipe (3) is connected with a pipeline plugging device (4), the pipeline plugging device (4) and the inside of the detection box (1) are connected.

8. A gas leak monitoring alarm according to claim 7, wherein: The pipeline plugging device (4) includes a plugging head A (401) connected to the connecting pipe (3), the plugging head A (401) is arranged in a ring shape, the two sides of the plugging head A (401) are provided with protrusions (402), the protrusions (402) are provided with threaded holes and connected with a plugging head B (404) through fixing bolts (403), the plugging head B (404) is also arranged in a ring shape.

9. A gas leak monitoring alarm according to claim 8, wherein: The inner wall of the sealing head A (401) is connected with a sealing sleeve A (405), the inner wall of the sealing head B (404) is connected with a sealing sleeve B (406), the sealing head A (401) and the sealing sleeve A (405) are provided with a communication port (408) penetrating into the connecting pipe (3), and the surface center positions of the sealing sleeve A (405) and the sealing sleeve B (406) are provided with air permeation grooves (407).

10. A gas leak monitoring alarm as claimed in claim 8, wherein: The upper and lower surfaces of the sealing head A (401) are provided with clamping grooves A (409), the clamping grooves A (409) are connected with sealing air bags (410), the sealing air bags (410) are connected with the connecting pipe (3) through air conveying pipes (411), the surface of the sealing head B (404) is provided with clamping grooves B (412) matched with the clamping grooves A (409), and the surface of the sealing head B (404) is provided with a limiting plate (413) outside the clamping grooves B (412).

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