Multifunctional intelligent monitoring system for combustible gas in closed space

Abstract

The utility model discloses a multifunctional intelligent monitoring system for combustible gas in a closed space. The multifunctional intelligent monitoring system comprises an underground well chamber combustible gas monitoring device, a laser gas sensor, a water level rod, a well lid displacement alarm device, a pressure sensor, a communication antenna and a data management center, the underground well chamber combustible gas monitoring device comprises an upper shell and a lower shell, a liquid crystal window is arranged in the middle of the upper shell; a PCB mainboard and a battery compartment are arranged in the cavity of the lower shell; external interfaces of the laser gas sensor, the water level rod, the communication antenna, the pressure sensor and the well lid displacement alarm device are arranged outside the lower shell; the PCB mainboard comprises a control unit, a power supply module, a communication module, a liquid crystal module and a storage module; the data management center is connected with the communication module through a 4G communication network; according to the technical method, gas leakage, management pressure, well chamber water level and well lid displacement or loss of the well chamber of the urban natural gas underground pipe network can be solved, and real-time alarm information can be realized through the Internet of Things platform.

Description

Technical Field

[0001] This utility model patent belongs to the technical field of combustible gas detection in underground well chambers of urban natural gas pipelines, and specifically relates to a multifunctional intelligent monitoring system for combustible gas in a confined space. Background Art

[0002] With the rapid development of natural gas in my country over the past few decades, the construction of underground natural gas pipelines has continued to extend. At the same time, the natural gas pipelines have been buried 1 to 2 meters underground for a long time. The underground well chambers of urban gas pipelines have a harsh environment and are often soaked in rainwater, sewage, corroded, and equipment is aged, which makes it easy for gas leaks to cause explosions.

[0003] At present, the space of underground well chambers of urban gas pipelines is relatively narrow. The general method for checking whether the combustible gas in the underground well chamber is to open the well cover, and then extend the probe of the combustible gas concentration tester into the well or the bottom of the well, and obtain the concentration through the reading of the tester, and visually check the water level in the well chamber; this method may cause gas leakage and cannot accurately detect the original concentration. If the gas concentration in the well is very high, it will threaten the life safety of the inspection personnel, especially the pressure in the pipeline cannot be detected at all, and the displacement or missing of the well cover of the underground well chamber of the pipeline cannot be discovered in time, which can easily lead to accidents. In addition, most of the underground well chambers of urban gas pipelines are in open areas or in complex terrain in the wild, and the specific location cannot be accurately located.

[0004] To summarize the above reasons, there are many problems in the underground well chambers of urban gas pipelines. Therefore, it is necessary to design a multifunctional intelligent monitoring system for combustible gas in a confined space to solve the above technical problems. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, this utility model patent proposes a multifunctional intelligent monitoring system for combustible gases in a confined space; it can completely solve the problems of natural gas concentration in underground well chambers of urban gas pipelines, pipeline pressure, water immersion detection in the well chamber, displacement or loss of manhole covers, and accurate positioning that cannot be achieved by existing products and technologies.

[0006] The technical solution of the utility model patent is: to solve the problems existing in the above-mentioned prior art, the utility model patent adopts a multifunctional intelligent monitoring system for combustible gas in a confined space, which is characterized by: including an underground well chamber combustible gas monitoring device, a laser gas sensor, a water level rod, a manhole cover displacement alarm device, a pressure sensor, a communication antenna and a data management center; the laser gas sensor, the water level rod, the manhole cover displacement alarm device, the pressure sensor, the communication antenna are connected to the underground well chamber combustible gas monitoring device; and the data management center is connected to the communication module of the underground well chamber combustible gas monitoring device.

[0007] Furthermore, the underground well chamber combustible gas monitoring device comprises an upper shell, a sealing ring and a lower shell; the sealing ring is installed between the upper shell and the lower shell, and the upper shell is tightened and fixed with a hexagon socket screw penetrating the sealing ring and the screw hole of the lower shell; the upper shell, the lower shell and the sealing ring reach the IP68 explosion-proof grade; the underground well chamber combustible gas monitoring device has been subjected to a 72-hour water immersion test, and after the upper shell is opened, there is no trace of water inside, and all functions and data indicators are consistent with those before the immersion.

[0008] Furthermore, a 50*30mm rectangular window is opened in the middle of the upper shell, with explosion-proof transparent glass embedded inside, and the window is used for the liquid crystal module to display data.

[0009] Furthermore, the lower shell cavity includes a PCB mainboard and a battery compartment, the PCB mainboard has fixing screw holes at four corners, and the PCB mainboard is fixed to the lower shell bracket hole with screws; the battery compartment is at the bottom of the lower shell cavity; a lithium battery is installed in the battery compartment, and a fixing strip is provided in the middle of the battery compartment, and screw holes are provided at both ends of the fixing strip, which is fixed to the lower shell bracket hole with two screws to fix the lithium battery.

[0010] Furthermore, the PCB mainboard includes a control unit, a power module, a communication module, a liquid crystal module and a storage module; the PCB mainboard, the power module, the communication module, the liquid crystal module and the storage module are connected to the control unit; the control unit sends instructions to control the power supply of the power module; controls the display content of the liquid crystal module; controls the data storage of the storage module; controls the communication module to communicate with the data management center; and the control unit collects data from the laser gas sensor, the water level rod, the manhole cover displacement alarm device and the pressure sensor according to a preset time period.

[0011] Furthermore, six lithium batteries are installed in the battery compartment, and the battery compartment is connected to the lithium batteries; the battery compartment is connected to the power module.

[0012] Furthermore, the power module is connected to the PCB mainboard to supply power to the PCB mainboard, and then the PCB mainboard power circuit supplies power to the control unit, communication module, liquid crystal module and storage module as well as the laser gas sensor at the external interface of the lower shell, the manhole cover displacement alarm device, the pressure sensor, and the communication antenna.

[0013] Furthermore, the storage module is connected to the control unit, the control unit collects and calculates data, and stores relevant information in the storage module, and the storage module can store a maximum of 5,000 records.

[0014] Furthermore, the liquid crystal module is connected to the control unit, and the control unit displays the collected and calculated data, alarm or fault information through the liquid crystal module. The liquid crystal module is installed inside the liquid crystal window of the upper shell to display information content.

[0015] Furthermore, the communication module is connected to the control unit, and the control unit connects the collected data and alarm or fault information to the communication antenna through the communication module, and is connected to the data management center through the communication antenna in a 4G wireless communication mode, and the data management center saves the data.

[0016] Furthermore, the laser gas sensor has a female threaded hole on the leftmost side of the lower shell, and a male threaded head at one end of the laser gas sensor. The male threaded head of the laser gas sensor is inserted into the leftmost female threaded hole on the lower shell and tightened, and the thread is painted with waterproof glue; the laser gas sensor is connected to the control unit; the laser gas sensor sends the collected combustible gas concentration value to the control unit, and when the combustible gas concentration value is greater than a preset threshold value calculated by the control unit, the control unit sends a real-time alarm instruction and the combustible gas concentration value to the communication module, and the communication module is connected to the communication antenna, and is connected to the data management center through the communication antenna in a 4G wireless communication mode, and the alarm information is stored in the data management center, and the relevant departments understand the real-time alarm information and combustible gas concentration value in real time through the SCADA system.

[0017] Furthermore, the water level rod has a female threaded hole on the far right below the lower shell body, and a male threaded head at one end of the water level rod. The male threaded head of the water level rod is inserted into the rightmost female threaded hole below the lower shell body and tightened. The thread is painted with waterproof glue, and a float is provided at the other end of the water level rod. There is a minimum water level limit strip at the lower end of the float, and a maximum water level limit strip for the float to float 20 mm above the upper end of the float; the water level rod is connected to the control unit; the position of the float at the lowest water level limit strip indicates that there is no water or the water level is normal; when the float floats to the highest water level limit strip, the control unit generates water level alarm information, and stores the alarm information in the storage module at the same time, and controls the communication module to be connected to the communication antenna, and connects to the data management center via 4G wireless communication through the communication antenna, and stores the alarm information in the data management center, and the relevant departments understand the water level alarm information in real time through the SCADA system.

[0018] Furthermore, the manhole cover displacement alarm device is equipped with an aviation plug female head at the second external interface on the left side below the lower shell body, the lower interface of the manhole cover displacement alarm device is connected to the data cable, and the other end of the data cable is equipped with an aviation plug male head, which is inserted into the second aviation plug female head on the left side below the lower shell body and tightened; the manhole cover displacement alarm device is connected to the control unit; a spring sensing device is installed at the upper end of the manhole cover displacement alarm device, and the manhole cover is placed directly above the underground well chamber, and the manhole cover presses the spring sensing device at the upper end of the manhole cover displacement alarm device. When the manhole cover is missing or moved out of the spring sensing device, the control unit generates a manhole cover displacement or missing alarm information, and stores the alarm information in the storage module at the same time, and controls the communication module to be connected to the communication antenna, and connects to the data management center through the communication antenna in a 4G wireless communication mode, and stores the alarm information in the data management center. The relevant departments understand the manhole cover displacement or missing alarm information in real time through the SCADA system.

[0019] Furthermore, the pressure sensor is equipped with an aviation plug female at the third external interface on the left side below the lower shell; the lower interface of the pressure sensor is connected to the data cable, and the other end of the data cable is equipped with an aviation plug male. The aviation plug male is inserted into the third aviation plug female on the left side below the lower shell and tightened, and the other end is connected to the underground well chamber pipeline interface; the pressure sensor is connected to the control unit, and the control unit presets the interval time for collecting pressure sensor data. The control unit collects pressure sensor data according to the preset interval time, and the control unit presets the pressure alarm value. When the pressure data reaches or exceeds the preset threshold, the control unit generates pressure alarm information, and stores the alarm information in the storage module, and controls the communication module to be connected to the communication antenna, and is connected to the data management center through the communication antenna in a 4G wireless communication mode, and the alarm information is stored in the data management center. The relevant departments understand the pressure alarm information in real time through the SCADA system.

[0020] Furthermore, the communication antenna is installed on the top of the lower shell body with an external interface female screw hole, and one end of the communication antenna has a male screw head. The end of the communication antenna with the male screw head is inserted into the female screw hole and tightened; the communication antenna is connected to the communication module, and the control unit controls the connection between the communication module and the communication antenna as needed.

[0021] Furthermore, the data management center is connected to the data management center by sending 4G wireless communication through a communication antenna by a communication module.

[0022] Furthermore, a multifunctional intelligent monitoring system for combustible gas in a confined space has the following technical advantages: ① The utility model patent is equipped with a laser gas sensor, which can detect the concentration of combustible gas leakage in the underground well chamber of the city gas pipeline in real time, and upload it to the data management center through the 4G network in real time; ② Real-time measurement of the water level in the underground well chamber of the city gas pipeline, and when the water level exceeds the water level, the water level alarm information is uploaded to the data management center in real time through the 4G network; ③ Real-time detection of the status of the manhole cover in the underground well chamber of the city gas pipeline, if it is displaced or missing, the manhole cover missing alarm information is uploaded to the data management center in real time through the 4G network; ④ Real-time detection of the pressure of the city gas pipeline, if the pressure is lower or higher than the preset pressure, When the value is set, the manhole cover missing alarm information is uploaded to the data management center in real time through the 4G network; ⑤ This utility model patent also has a Beidou satellite positioning function. The gas company staff can check the longitude and latitude of each device through the SCADA system platform to accurately find the equipment installation location; ⑥ Through the above technical solutions, the gas company staff can monitor the operation of each control node in real time through the SCADA system platform. If an abnormality is found, the relevant maintenance personnel can be immediately arranged to solve the fault on site in time to prevent accidents; ⑦ This utility model patent is mainly suitable for natural gas leakage detection, water level detection, pipeline pressure detection and manhole cover displacement or missing detection in underground wells of urban gas pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model patent or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model patent. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative labor.

[0024] Figure 1 The attached figure is a schematic diagram of the structure of a multifunctional intelligent monitoring system for combustible gas in a confined space provided by the utility model patent.

[0025] Figure 2 The attached figure is a schematic diagram of the upper shell structure of the underground well chamber combustible gas monitoring device provided by the utility model patent.

[0026] Figure 3 The attached drawing is a schematic diagram of the structure of the lower shell of the underground well chamber combustible gas monitoring device provided by the utility model patent, the laser gas sensor, the water level rod, the pressure sensor, the manhole cover displacement alarm device, the communication antenna and the data management center. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model patent to clearly and completely describe the technical solutions in the embodiments of the utility model patent. Obviously, the described embodiments are only part of the embodiments of the utility model patent, not all of them. Based on the embodiments in the utility model patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model patent.

[0028] like Figure 1 , Figure 3 As shown, a multifunctional intelligent monitoring system for combustible gas in a confined space includes an underground well chamber combustible gas monitoring device 1, a laser gas sensor 11, a water level rod 12, a manhole cover displacement alarm device 13, a pressure sensor 14, a communication antenna 15 and a data management center 26; the laser gas sensor 11, the water level rod 12, the manhole cover displacement alarm device 13, the pressure sensor 14, the communication antenna 14 are connected to the underground well chamber combustible gas monitoring device 1; the data management center 26 is communicatively connected to the underground well chamber combustible gas monitoring device 1.

[0029] like Figure 2 , Figure 3 As shown, the underground well chamber combustible gas monitoring device 1 includes an upper shell 23, a sealing ring 3 and a lower shell 2; the sealing ring 3 is installed between the upper shell 23 and the lower shell 2, and there are 8 screw holes 24 on the surface of the upper shell 23, and 8 hexagonal screws are used to penetrate the sealing ring 3 and the screw holes 18 of the lower shell 2 to tighten and fix; the upper shell 23, the lower shell 2 and the sealing ring 3 reach the IP68 explosion-proof grade; the underground well chamber combustible gas monitoring device 1 has been subjected to a 72-hour water immersion test, and after the upper shell 23 is opened, there is no trace of water inside, and all functions and data indicators are consistent with those before the immersion.

[0030] like Figure 2 As shown, a 50*30 mm rectangular liquid crystal window 25 is opened in the middle of the upper shell 23, with explosion-proof transparent glass embedded therein, and the window is used for the liquid crystal module 5 to display data.

[0031] like Figure 3 As shown, the cavity of the lower shell 2 includes a PCB mainboard 4 and a battery compartment 10, the PCB mainboard 4 has four corner fixing screw holes 17, and the PCB mainboard 4 is fixed to the bracket hole of the lower shell 2 with four screws; the battery compartment 10 is in the cavity of the lower shell 2, below the PCB mainboard 4; a lithium battery is installed in the battery compartment 10, and a fixing strip 19 is provided in the middle of the battery compartment 10, and screw holes 20 are provided at both ends of the fixing strip 19, which is fixed to the bracket hole of the lower shell 2 with two screws for fixing the lithium battery.

[0032] like Figure 3As shown, the PCB main board 4 includes a control unit 6, a power module 8, a communication module 9, a liquid crystal module 5 and a storage module 7; the PCB main board 4, the power module 8, the communication module 9, the liquid crystal module 5 and the storage module 7 are connected to the control unit 6; the control unit 6 sends instructions to control the power supply module 8 to supply power; the liquid crystal module 5 is controlled to display content; the storage module 7 is controlled to store data; the communication module 9 is controlled to communicate with the data management center 26; the power supply module 8 is controlled to collect laser gas sensor 11, water level rod 12, manhole cover displacement alarm device 13, and pressure sensor data 14 according to a preset time period.

[0033] like Figure 3 As shown, six lithium batteries are installed in the battery compartment 10 , and the battery compartment 10 is connected to the lithium batteries; the battery compartment 10 is connected to the power module 8 .

[0034] like Figure 3 As shown, the power module 8 is connected to the PCB main board 4 to supply power to the PCB main board 4, and then the power line of the PCB main board 4 supplies power to the control unit 6, the communication module 9, the liquid crystal module 5 and the storage module 7, as well as the laser gas sensor 11 and the communication antenna 15 at the external interface of the lower shell 2; at the same time, the aviation plug female head 15 on the lower side of the lower shell 2 is supplied with power, and the aviation plug female head 15 supplies power to the manhole cover displacement alarm device 13 through the power line 21, and at the same time, the aviation plug female head 16 on the lower side of the lower shell 2 is supplied with power, and the aviation plug female head 16 supplies power to the pressure sensor 14 through the power line 22.

[0035] like Figure 3 As shown, the storage module 7 is connected to the control unit 6. The control unit 6 collects and calculates data and saves relevant information in the storage module 7. The maximum storage record of the storage module 7 is 5000.

[0036] like Figure 3 As shown, the liquid crystal module 5 is connected to the control unit 6, and the control unit 6 displays the collected and calculated data, alarm or fault information through the liquid crystal module 5. The liquid crystal module 5 is installed inside the liquid crystal window 25 of the upper shell 23 to display information content.

[0037] like Figure 3 As shown, the communication module 9 is connected to the control unit 6, and the control unit 6 connects the collected data and alarm or fault information to the communication antenna 15 through the communication module 9, and is connected to the data management center 26 through the communication antenna 15 in a 4G wireless communication mode, and the data management center 26 saves the data.

[0038] like Figure 3As shown, the laser gas sensor 11 has a female threaded hole on the leftmost side below the lower shell 2, and a male threaded head at one end of the laser gas sensor 11. The male threaded head of the laser gas sensor 11 is inserted into the leftmost female threaded hole below the lower shell 2 and tightened, and the thread is painted with waterproof glue; the laser gas sensor 11 is connected to the control unit 6; the laser gas sensor 11 sends the collected combustible gas concentration value to the control unit 6, and when the combustible gas concentration value calculated by the control unit 6 is greater than the preset threshold, the control unit 6 sends a real-time alarm instruction and the combustible gas concentration value to the communication module 9, and the communication module 9 is connected to the communication antenna 15, and is connected to the data management center 26 through the communication antenna 15 in a 4G wireless communication mode, and the alarm information is stored in the data management center 26. The relevant departments understand the real-time alarm information and the combustible gas concentration value in real time through the SCADA system.

[0039] like Figure 3 As shown, the water level rod 12 has a female threaded hole at the rightmost side below the lower shell 2, and a male threaded head at one end of the water level rod 12. The male threaded head of the water level rod 12 is inserted into the rightmost female threaded hole below the lower shell 2 and tightened. The thread is painted with waterproof glue. A float 122 is provided at the other end of the water level rod 12. A minimum water level limit bar 123 is provided at the lower end of the float 122, and a maximum water level limit bar 121 for the float 122 is provided 20 mm above the upper end of the float 122. The water level rod 12 is connected to the control unit 6; the float 122 is at the position When the lowest water level limit bar 123 indicates that there is no water or the water level is normal; when the float 122 floats to the highest water level limit bar 121, the control unit 6 generates water level alarm information, and stores the alarm information in the storage module 7, and controls the communication module 9 to connect with the communication antenna 15, and connects with the data management center 26 through the communication antenna 15 in a 4G wireless communication mode, and stores the alarm information in the data management center 26. The relevant departments can understand the water level alarm information in real time through the SCADA system.

[0040] like Figure 3As shown, the manhole cover displacement alarm device 13 is provided with an aviation plug female head 15 at the second external interface on the left side below the lower shell 2, the lower interface of the manhole cover displacement alarm device 13 is connected to the data line 21, and the other end of the data line 21 is provided with an aviation plug male head, and the aviation plug male head is inserted into the second aviation plug female head 15 on the left side below the lower shell 2 and tightened; the manhole cover displacement alarm device 13 is connected to the control unit 6; the upper end of the manhole cover displacement alarm device 13 is provided with a spring sensing device 131, the manhole cover is placed just above the underground well chamber, and the manhole cover presses the spring sensing device 131 at the upper end of the manhole cover displacement alarm device 13, when the manhole cover is missing or moved out of the spring sensing device 131, the control unit 6 generates a manhole cover displacement or missing alarm information, and stores the alarm information in the storage module 7, and controls the communication module 9 to be connected to the communication antenna 15, and connects to the data management center 26 through the communication antenna 15 in a 4G wireless communication mode, and stores the alarm information in the data management center 26, and the relevant departments learn the manhole cover displacement or missing alarm information in real time through the SCADA system.

[0041] like Figure 3 As shown, the pressure sensor 14 is provided with an aviation plug female head 16 at the third external interface on the left side below the lower shell 2; the lower interface of the pressure sensor 14 is connected to the data line 22, and the other end of the data line 22 is provided with an aviation plug male head, and the aviation plug male head is inserted into the third aviation plug female head 16 on the left side below the lower shell 2 and tightened, and the upper end of the pressure sensor 14 is provided with a threaded access to the indoor pipeline pressure interface 27 of the underground well; the pressure sensor 16 is connected to the control unit 6, and the control unit 6 presets the interval time for collecting the data of the pressure sensor 14, and the control unit 6 collects the data of the pressure sensor 14 according to the preset interval time, and the control unit 6 presets the pressure alarm value, and when the pressure data reaches or exceeds the preset threshold value, the control unit 6 generates the pressure alarm information, and stores the alarm information in the storage module 7 at the same time, and controls the communication module 9 to be connected with the communication antenna 15, and connects with the data management center 26 through the communication antenna 15 in a 4G wireless communication mode, and stores the alarm information in the data management center 26, and the relevant departments understand the pressure alarm information in real time through the SCADA system.

[0042] like Figure 3 As shown, the communication antenna 15 is installed on the upper part of the lower shell 2 and has a female screw hole for the external interface. One end of the communication antenna 15 has a male screw head. The end of the communication antenna 15 with the male screw head is inserted into the female screw hole for the external interface on the upper part of the lower shell 2 and tightened. The communication antenna 15 is connected to the communication module 9, and the control unit 6 controls the connection between the communication module 9 and the communication antenna 15 as needed.

[0043] like Figure 3 As shown, the data management center 26 is connected to the data management center 26 by sending 4G wireless communication through the communication antenna 15 by the communication module 9.

Claims

1. A multifunctional intelligent monitoring system for combustible gas in a confined space, characterized by: It includes an underground well chamber combustible gas monitoring device, a laser gas sensor, a water level rod, a well cover displacement alarm device, a pressure sensor, a communication antenna and a data management center; the laser gas sensor, the water level rod, the well cover displacement alarm device, the pressure sensor, the communication antenna are connected to the underground well chamber combustible gas monitoring device; the data management center is connected to the underground well chamber combustible gas monitoring device communication module.

2. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 1 is characterized in that: The underground well chamber combustible gas monitoring device comprises an upper shell, a sealing ring and a lower shell; the sealing ring is installed between the upper shell and the lower shell, and the upper shell is tightened and fixed with hexagon socket screws penetrating the sealing ring and the screw holes of the lower shell; the upper shell, the lower shell and the sealing ring reach the IP68 explosion-proof grade; a 50*30mm rectangular window is opened in the middle of the upper shell, with explosion-proof transparent glass embedded in it.

3. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 2 is characterized by: The lower shell cavity includes a PCB mainboard and a battery compartment, and the PCB mainboard is provided with fixing screw holes at the four corners, and the PCB mainboard is fixed to the lower shell bracket holes by screws; the battery compartment is at the bottom of the lower shell cavity; 6 lithium batteries are installed in the battery compartment, and a fixing strip is provided in the middle of the battery compartment, and screw holes are provided at both ends of the fixing strip, which is fixed to the lower shell bracket holes by two screws for fixing the lithium battery; the battery compartment is connected to the lithium battery; the battery compartment is connected to the power module.

4. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 3 is characterized by: The PCB mainboard comprises a control unit, a power module, a communication module, a liquid crystal module and a storage module; the PCB mainboard, the power module, the communication module, the liquid crystal module and the storage module are connected to the control unit.

5. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 4 is characterized by: The power module is connected to the PCB mainboard, and supplies power to the control unit, communication module, liquid crystal module and storage module through the PCB mainboard power circuit, as well as to the laser gas sensor, manhole cover displacement alarm device, pressure sensor and communication antenna at the external interface of the lower shell.

6. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 1 is characterized by: The laser gas sensor has a female threaded hole on the leftmost side below the lower shell, and a male threaded head at one end of the laser gas sensor. The male threaded head of the laser gas sensor is inserted into the female threaded hole on the leftmost side below the lower shell and tightened, and the thread is painted with waterproof glue; the laser gas sensor is connected to the control unit.

7. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 1 is characterized by: The water level rod has a female threaded hole on the far right below the cavity of the lower shell, and a male threaded head at one end of the water level rod. The male threaded head of the water level rod is inserted into the female threaded hole on the far right below the cavity of the lower shell and tightened, and the thread is painted with waterproof glue; the water level rod is connected to the control unit.

8. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 1 is characterized by: The manhole cover displacement alarm device has a second external interface on the left side below the lower shell body installed with an aviation plug female head. The lower interface of the manhole cover displacement alarm device is connected to the data cable. The other end of the data cable is equipped with an aviation plug male head. The aviation plug male head is inserted into the second aviation plug female head on the left side of the lower shell body and tightened. The manhole cover displacement alarm device is connected to the control unit.

9. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 1 is characterized by: The pressure sensor has a third external interface on the left side below the lower shell body installed with an aviation plug female head. The lower interface of the pressure sensor is connected to a data cable. The other end of the data cable is equipped with an aviation plug male head. The aviation plug male head is inserted into the third aviation plug female head on the left side of the lower shell body and tightened. The pressure sensor is connected to the control unit.

10. The multifunctional intelligent monitoring system for combustible gas in a confined space according to claim 1 is characterized in that: The communication antenna is installed on the external interface above the cavity of the lower shell; the communication antenna is connected to the communication module, and the 4G communication wireless signal is sent through the communication antenna to connect to the data management center.

Images