Limited space gas monitoring device and method

Abstract

The invention provides a limited space gas monitoring device and method, and relates to the technical field of gas monitoring, the limited space gas monitoring device comprises a gas monitoring device body, the top surface of the gas monitoring device body is fixedly provided with a control panel, and one side of the gas monitoring device body is fixedly connected with a circuit wiring; one end of the gas monitoring device body is fixedly connected with a frequency converter, the end, provided with the frequency converter, of the gas monitoring device body is provided with a gas extraction mechanism used for extracting gas, and the side, away from the gas extraction mechanism, of the gas monitoring device body is provided with an exhaust mechanism used for exhausting gas. The exhaust mechanism is connected with the three storage mechanisms used for collecting gas, and the metal hose is thin, long, deformable and capable of extending into a narrow space, so that the gas monitoring device can monitor the limited and narrow space, and the problems that most of existing gas monitoring devices are low in applicability and not prone to gas monitoring in the limited space are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas monitoring, and more specifically, particularly relates to a gas monitoring device and method for confined spaces. Background Art

[0002] In modern industrial production and the construction and maintenance of various infrastructure, confined space operations are extremely common, such as underground pipelines, chemical reactors, storage tanks, etc. These confined spaces usually have the characteristics of poor ventilation and relatively small space.

[0003] The gas components in confined spaces are complex and variable. Toxic and harmful gases contained therein, such as carbon monoxide (CO), hydrogen sulfide (H2S), etc., are extremely likely to accumulate in confined spaces. Once these gases reach a certain concentration, they will pose a great threat to the lives of personnel entering the space for operation, and may cause serious consequences such as poisoning and asphyxiation. Combustible gases such as methane (CH4), when mixed with air in a confined space to reach a certain ratio, may also cause an explosion when encountering an open flame or high temperature, seriously endangering the safety of personnel and the integrity of facilities and equipment. The existing solution is to monitor the gases in these spaces through gas monitoring devices.

[0004] Currently, most of the existing gas monitoring devices achieve their effects through the following technologies; Sensor technology, including electrochemical sensor technology, catalytic combustion sensor technology, infrared absorption sensor technology, and semiconductor sensor technology; Spectral analysis technology, including laser spectroscopy technology and Fourier transform infrared spectroscopy technology; Gas chromatography technology, which uses the difference in the distribution coefficients of gas mixtures between the stationary phase and the mobile phase to separate and analyze gases. The gas sample to be measured is injected into the chromatographic column, and different gases have different retention times in the chromatographic column, flowing out in sequence and being detected by the detector. The composition and concentration of the gas are determined based on information such as the retention time and peak area.

[0005] Data processing and transmission technology, including data processing technology and data transmission technology.

[0006] Currently, when the existing gas monitoring devices are actually used, it is found that there are at least the following technical problems; Since the existing gas monitoring devices need to integrate a variety of sensors and various electrical units, their volume is often large. When applied to some small spaces, due to the volume reason, it is impossible to penetrate deeply, resulting in limited monitoring effects on the gases in small spaces. And these small spaces are most likely to accumulate harmful gases due to poor ventilation. Therefore, most of the existing gas monitoring devices have low applicability and are not easy to monitor the gases in limited spaces. Summary of the Invention

[0007] In order to at least improve or solve one of the above technical problems, the present invention provides a confined space gas monitoring device and method.

[0008] To achieve the above object, the present invention adopts the following scheme: In a first aspect of the present invention, there is provided a confined space gas monitoring device, including a gas monitoring device body. A control panel is fixedly installed on the top surface of the gas monitoring device body. One side of the gas monitoring device body is fixedly connected with a circuit wiring. One end of the gas monitoring device body is fixedly connected with a frequency converter. At the end of the gas monitoring device body where the frequency converter is installed, there is an air extraction mechanism for extracting gas. On the side of the gas monitoring device body away from the air extraction mechanism, there is an exhaust mechanism for discharging gas. The exhaust mechanism is connected with three storage mechanisms for collecting gas. The air extraction mechanism includes an air pump, a guiding pipe and a metal hose. The exhaust mechanism includes a guiding pipe, three second electromagnetic valves and three docking heads. The storage mechanism includes a threaded joint, an inner cylinder, a sealing valve and a folding airbag.

[0009] Preferably, the air outlet end of the air pump is docked with the air inlet end of the gas monitoring device body. The air pump is fixedly connected with the gas monitoring device body. The air inlet end of the air pump is fixedly connected with the guiding pipe.

[0010] Preferably, the end of the guiding pipe away from the air pump is fixedly connected with a metal hose. An electromagnetic check valve is fixedly installed at the end of the guiding pipe close to the air pump. A first electromagnetic valve is fixedly installed in the middle section of the guiding pipe. The air pump is controlled by the control panel to start, and extracts the gas in the confined space through the guiding pipe and the metal hose and introduces it into the gas monitoring device body for monitoring by the gas monitoring device body. The air pump is electrically connected with the frequency converter. The frequency converter is electrically connected with the control panel. Both the electromagnetic check valve and the first electromagnetic valve are electrically connected with the control panel.

[0011] Preferably, the guiding pipe is docked with the exhaust end of the gas monitoring device body. The guiding pipe is fixedly connected with the gas monitoring device body. Three shunt pipes are provided on the side of the guiding pipe away from the gas monitoring device body.

[0012] Preferably, a second electromagnetic valve is fixedly installed in the middle section of each of the three shunt pipes of the guiding pipe. The three shunt pipes are respectively fixedly connected with the three docking heads. The gas monitored by the gas monitoring device body is guided to the three storage mechanisms for storage through the guiding pipe in cooperation with the three docking heads. The three second electromagnetic valves are all electrically connected with the control panel. The control panel is electrically connected with the gas monitoring device body.

[0013] Preferably, the inner walls of the three docking heads are all provided with first threads, and the outer walls of the three docking heads are all provided with three second threads.

[0014] Preferably, an inner cylinder is fixedly connected to the inner side of the threaded joint. A first threaded groove is formed on the outer surface of the inner cylinder, and a second threaded groove is formed on the inner wall of the threaded joint.

[0015] Preferably, the sealing valve is fixedly connected to the threaded joint. The inner cylinder is communicated with the sealing valve. One end of the sealing valve away from the threaded joint is fixedly connected to the folding airbag. The sealing valve is a manual valve. The folding airbag is used to store the gas discharged by the gas monitoring device body to prevent harmful gas leakage, and the sealing valve cooperates for sealing.

[0016] Preferably, handles are fixedly connected to both ends of the top surface of the gas monitoring device body. The two handles are used to transfer the whole device, which is convenient for the user to transport. The threaded joint is threadedly connected to the second thread of the docking head through the second threaded groove. The docking head is sleeved inside the threaded joint. The inner cylinder is threadedly connected to the first thread of the docking head through the first threaded groove. The inner cylinder is sleeved inside the docking head. The inner cylinder is sleeved with the docking head, and the docking head is sleeved with the threaded joint, forming two interlayers, and cooperating with the two threaded structures to achieve double-layer sealing, thereby obtaining a higher sealing performance.

[0017] In the second aspect of the present invention, a method for using a confined space gas monitoring device is provided, including the following steps: S1: Place the device near the position where the gas needs to be monitored, insert the metal hose into the narrow space, and start the device through the control panel after completion of the placement; S2: The specific monitoring process is as follows: The control panel controls the air pump to start. The air pump extracts the gas in the space through the guiding pipe and the metal hose and introduces it into the gas monitoring device body for monitoring. The second solenoid valve in the middle is in an open state, and in cooperation with the folding airbag, the air originally remaining in the gas monitoring device body has a discharge space; S3: When the gas monitoring of the narrow space by the gas monitoring device body is completed, it is discharged into the folding airbags on the left and right sides according to the nature of the gas. For example, if the gas monitoring device body monitors that the gas in the narrow space is a toxic gas, it is discharged into the left folding airbag. If it is a combustible gas, it is discharged into the right folding airbag. The gases are classified and stored. When discharging, the corresponding second solenoid valve is automatically opened by the control panel and automatically controlled to close after the discharge is completed. At the same time, the second solenoid valve in the middle is automatically closed during the discharge.

[0018] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, by providing a metal hose, the device is placed near the position where the gas needs to be monitored, and the metal hose is inserted into a narrow space. After the placement is completed, the device is started through the control panel. The specific monitoring process is as follows: The control panel controls the air pump to start. The air pump extracts the gas in the space through the guiding pipe and the metal hose and introduces it into the gas monitoring device body for monitoring. Since the metal hose is relatively slender and deformable, it can extend into the narrow space, enabling the present application to monitor a limited and narrow space, and solving the problem that most existing gas monitoring devices have relatively low applicability and are not easy to monitor the gas in a limited space.

[0019] In the present invention, by providing three storage mechanisms, the detected gas can be stored to prevent the gas from leaking to the outside and thus polluting the environment, making the present application have the advantages of being more environmentally friendly and not easily polluting the environment.

[0020] In the present invention, by providing three storage mechanisms, the gas monitoring device body continuously starts to monitor the gas in the narrow space. When the monitoring is completed or the folding airbag is filled with gas, the staff adjusts the sealing valve to the closed state and then removes the entire storage mechanism and replaces it with a new one. Before that, the staff needs to take out the metal hose from the narrow space, control the first solenoid valve to the closed state through the control panel, control the electromagnetic check valve to the open state, start the air pump to suck the gas outside the narrow space through the guiding pipe and the electromagnetic check valve for a period of time to introduce all the gas in the gas monitoring device body and the exhaust mechanism into the folding airbag in the middle to prevent gas leakage. Subsequently, the control panel controls the three second solenoid valves to the closed state. This process is automatically controlled by the control panel. After the replacement of the storage mechanism is completed, the control panel is used to control the start to repeat the first-step monitoring operation, enabling the present application to transfer the gas that has been monitored, which can play a role in sampling, and these gases can be transferred to a more advanced laboratory for further component detection, making the present application have the advantage of being easy to use.

[0021] In the present invention, by providing a docking head and a threaded joint, the first thread and the second thread cooperate with the thread groove one and the thread groove two for sealing, making the present application have high sealing performance, effectively preventing gas leakage, and making the present application have high stability.

[0022] In the present invention, by providing two handles, it is convenient for the staff to exert force, making the present application have the advantage of being easy to transport. Description of the Drawings

[0023] Figure 1 is the left side view structural schematic diagram of the whole of the present invention; Figure 2 is the right side view structural schematic diagram of the whole of the present invention; Figure 3 is the top view structural schematic diagram of the whole of the present invention; Figure 4 It is a schematic structural diagram of the separated state of the overall exhaust mechanism and storage mechanism of the present invention; Figure 5 It is a schematic structural diagram of the overall exhaust mechanism of the present invention; Figure 6 It is a schematic structural diagram of the overall storage mechanism of the present invention; Figure 7 It is a schematic structural diagram of the overall air extraction mechanism of the present invention; Figure 8 It is the present invention Figure 2 Schematic enlarged structural diagram at position A.

[0024] In the figure, the corresponding relationship between the component names and the drawing reference numbers is as follows: 1. Gas monitoring device body; 2. Air extraction mechanism; 3. Diversion pipe; 4. Storage mechanism; 101. Control panel; 102. Circuit wiring; 103. Handle; 104. Frequency converter; 201. Air pump; 202. Guide pipe; 203. Electromagnetic check valve; 204. First solenoid valve; 205. Metal hose; 301. Second solenoid valve; 302. Docking head; 303. First thread; 304. Second thread; 401. Threaded joint; 402. Inner cylinder; 403. First thread groove; 404. Second thread groove; 405. Sealing valve; 406. Folding airbag. Specific embodiments

[0025] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] Example: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8, the present invention provides a limited space gas monitoring device, including a gas monitoring device body 1. A control panel 101 is fixedly installed on the top surface of the gas monitoring device body 1. One side of the gas monitoring device body 1 is fixedly connected with a circuit wiring 102. One end of the gas monitoring device body 1 is fixedly connected with a frequency converter 104. At the end of the gas monitoring device body 1 where the frequency converter 104 is installed, there is an air extraction mechanism 2 for extracting gas. On the side of the gas monitoring device body 1 away from the air extraction mechanism 2, there is an exhaust mechanism for discharging gas. The exhaust mechanism is connected with three storage mechanisms 4 for collecting gas. The air extraction mechanism 2 includes an air pump 201, a guiding pipe 202, and a metal hose 205. The exhaust mechanism includes a diversion pipe 3, three second solenoid valves 301, and three docking heads 302. The storage mechanism 4 includes a threaded joint 401, an inner cylinder 402, a sealing valve 405, and a folding airbag 406.

[0027] The air outlet end of the air pump 201 is docked with the air inlet end of the gas monitoring device body 1. The air pump 201 is fixedly connected with the gas monitoring device body 1. The air inlet end of the air pump 201 is fixedly connected with the guiding pipe 202.

[0028] The end of the guiding pipe 202 away from the air pump 201 is fixedly connected with a metal hose 205. An electromagnetic check valve 203 is fixedly installed at the end of the guiding pipe 202 close to the air pump 201. A first solenoid valve 204 is fixedly installed in the middle section of the guiding pipe 202. The air pump 201 is controlled by the control panel 101 to start and extract the gas in the limited space through the guiding pipe 202 and the metal hose 205 and introduce it into the gas monitoring device body 1 for monitoring by the gas monitoring device body 1. The air pump 201 is electrically connected with the frequency converter 104. The frequency converter 104 is electrically connected with the control panel 101. Both the electromagnetic check valve 203 and the first solenoid valve 204 are electrically connected with the control panel 101.

[0029] The diversion pipe 3 is docked with the exhaust end of the gas monitoring device body 1. The diversion pipe 3 is fixedly connected with the gas monitoring device body 1. Three shunt pipes are arranged on the side of the diversion pipe 3 away from the gas monitoring device body 1.

[0030] A second solenoid valve 301 is fixedly installed in the middle section of each of the three shunt pipes of the diversion pipe 3. The three shunt pipes are respectively fixedly connected with three docking heads 302. The gas monitored by the gas monitoring device body 1 is guided to the three storage mechanisms 4 for storage through the diversion pipe 3 in cooperation with the three docking heads 302. The three second solenoid valves 301 are all electrically connected with the control panel 101. The control panel 101 is electrically connected with the gas monitoring device body 1.

[0031] First threads 303 are provided on the inner walls of the three docking heads 302. Three second threads 304 are provided on the outer walls of the three docking heads 302.

[0032] The inner side of the threaded joint 401 is fixedly connected with an inner cylinder 402. Thread grooves one 403 are formed on the outer surface of the inner cylinder 402, and thread grooves two 404 are formed on the inner wall of the threaded joint 401.

[0033] The sealing valve 405 is fixedly connected with the threaded joint 401. The inner cylinder 402 is communicated with the sealing valve 405. One end of the sealing valve 405 away from the threaded joint 401 is fixedly connected with the folding airbag 406. The sealing valve 405 is a manual valve. The folding airbag 406 is used to store the gas discharged by the gas monitoring device body 1 to prevent harmful gas leakage, and the sealing valve 405 cooperates for sealing.

[0034] Both ends of the top surface of the gas monitoring device body 1 are fixedly connected with a handle 103. The two handles 103 are used to transfer the whole device, facilitating the user to transport. The threaded joint 401 is threadedly connected with the second thread 304 of the docking head 302 through the thread groove two 404. The docking head 302 is sleeved inside the threaded joint 401. The inner cylinder 402 is threadedly connected with the first thread 303 of the docking head 302 through the thread groove one 403. The inner cylinder 402 is sleeved inside the docking head 302. The inner cylinder 402 is sleeved with the docking head 302, and the docking head 302 is also sleeved with the threaded joint 401, forming two interlayers, and cooperating with the two thread structures to achieve double-layer sealing, thereby obtaining a relatively high sealing performance.

[0035] The gas monitoring device body 1: As the core component, it monitors the gas in the extracted limited space, integrates the cooperation of each component, and realizes the overall gas monitoring function.

[0036] The air extraction mechanism 2: Responsible for extracting the gas in the limited space and transporting the gas into the gas monitoring device body 1 for monitoring.

[0037] The diversion pipe 3: Connects the exhaust end of the gas monitoring device body 1, guides the monitored gas to the storage mechanism 4, and plays a role in gas diversion.

[0038] The storage mechanism 4: Used to collect and store the gas discharged by the gas monitoring device body 1 to prevent harmful gas leakage.

[0039] The control panel 101: Controls the start, stop and operation of each component of the device, and realizes the operation of the air pump 201, solenoid valve, etc. and the control of the monitoring process.

[0040] The circuit wiring 102: Provides power connection and circuit transmission for the gas monitoring device body 1 and related components, ensuring the normal power supply and signal transmission of the device.

[0041] The handle 103: Facilitates the user to transfer and transport the whole device, enhancing the portability of the device.

[0042] Frequency converter 104: Electrically connected to the air pump 201, it adjusts the rotational speed of the air pump 201 to adapt to different gas extraction requirements.

[0043] Air pump 201: Plays a power role in the air extraction mechanism 2. It extracts the gas in the limited space through the guide pipe 202 and the metal hose 205 and introduces it into the gas monitoring device body 1.

[0044] Guide pipe 202: Connects the air pump 201 and the metal hose 205, provides a channel for gas extraction, and guides the gas flow to the air pump 201.

[0045] Electromagnetic check valve 203: Installed at one end of the guide pipe 202 close to the air pump 201, it controls the one-way flow of gas and prevents gas backflow.

[0046] First solenoid valve 204: Installed in the middle section of the guide pipe 202, it is controlled by the control panel 101 and is used to adjust and control the gas extraction volume and extraction time.

[0047] Metal hose 205: Has flexibility, is convenient to insert into a narrow limited space, and realizes the extraction of gas at different positions.

[0048] Second solenoid valve 301: Installed in the middle sections of the three shunt pipes of the diversion pipe 3, it is controlled by the control panel 101 and is used to control the discharge of the monitored gas to different storage mechanisms 4.

[0049] Docking joint 302: Connects the diversion pipe 3 and the storage mechanism 4, realizes the transportation of gas from the diversion pipe 3 to the storage mechanism 4, and its threaded structure is used for sealed connection with the storage mechanism 4.

[0050] First thread 303: Located on the inner wall of the docking joint 302, it cooperates with the thread groove one 403 of the inner cylinder 402 to realize the threaded connection and sealing between the docking joint 302 and the inner cylinder 402.

[0051] Second thread 304: Located on the outer wall of the docking joint 302, it cooperates with the thread groove two 404 of the threaded joint 401 to realize the threaded connection and sealing between the docking joint 302 and the threaded joint 401.

[0052] Threaded joint 401: Is threadedly connected to the docking joint 302, connects the storage mechanism 4 with the exhaust mechanism, and at the same time provides an installation basis for the inner cylinder 402 and the sealing valve 405.

[0053] Inner cylinder 402: Is threadedly connected to the docking joint 302, and cooperates with the threaded joint 401 to form a double-layer sealing structure, improving the sealing performance of the connection between the storage mechanism 4 and the exhaust mechanism.

[0054] Thread groove 1 403: It is opened on the outer surface of the inner cylinder 402 and is matched with the first thread 303 of the docking head 302 to realize the threaded connection and sealing between the inner cylinder 402 and the docking head 302.

[0055] Thread groove 2 404: It is opened on the inner wall of the threaded joint 401 and is matched with the second thread 304 of the docking head 302 to realize the threaded connection and sealing between the threaded joint 401 and the docking head 302.

[0056] Sealing valve 405: It is fixedly connected to the threaded joint 401 and is a manual valve, which is used to control the gas entering the folding airbag 406 and plays a sealing role during gas storage to prevent gas leakage.

[0057] Folding airbag 406: It is used to store the gas discharged from the gas monitoring device body 1, can expand and contract according to the amount of stored gas, and cooperates with the sealing valve 405 to prevent harmful gas leakage.

[0058] Working principle: First step, place this device near the position where the gas needs to be monitored, insert the metal hose 205 into the narrow space. After the placement is completed, start the device through the control panel 101. The specific monitoring process is as follows: The control panel 101 controls the air pump 201 to start. The air pump 201 extracts the gas in the space through the guide pipe 202 and the metal hose 205 and introduces it into the gas monitoring device body 1 for monitoring. The second solenoid valve 301 in the middle is in the normally open state, which cooperates with the folding airbag 406 to enable the air originally retained in the gas monitoring device body 1 to have a discharge space. When the gas monitoring device body 1 finishes monitoring the gas in the narrow space, it is discharged into the folding airbags 406 on the left and right according to the nature of the gas. For example, if the gas monitoring device body 1 monitors that the gas in the narrow space is a toxic gas, it is discharged into the left folding airbag 406. If it is a combustible gas, it is discharged into the right folding airbag 406. The gas is stored separately. When discharging, the corresponding second solenoid valve 301 is automatically opened by the control panel 101 and automatically closed after the discharge is completed. At the same time, the second solenoid valve 301 in the middle is automatically closed during the discharge.

[0059] Step 2: The gas monitoring device body 1 continuously starts to monitor the gas in the narrow space. After the monitoring is completed or the folding airbag 406 is filled with gas, the staff adjusts the sealing valve 405 to the closed state and then removes the entire storage mechanism 4 and replaces it with a new one. Before that, the staff needs to take out the metal hose 205 from the narrow space, control the first solenoid valve 204 to the closed state through the control panel 101, control the electromagnetic check valve 203 to the open state, start the air pump 201, and suck the gas outside the narrow space through the guide pipe 202 and the electromagnetic check valve 203 for a period of time to introduce all the gas in the gas monitoring device body 1 and the exhaust mechanism into the folding airbag 406 in the middle to prevent gas leakage. Subsequently, the control panel 101 controls the three second solenoid valves 301 to the closed state. This process is automatically controlled by the control panel 101. After replacing the storage mechanism 4, the control panel 101 is used to control and start to repeat the monitoring operation in Step 1.

[0060] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] As is known by technical common sense, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A confined space gas monitoring device, characterized in that: It comprises a gas monitoring device body (1); A control panel (101) is fixedly mounted on the top surface of the gas monitoring device body (1), a circuit connection (102) is fixedly connected to one side of the gas monitoring device body (1), and a frequency converter (104) is fixedly connected to one end of the gas monitoring device body (1); An exhaust mechanism (2) for extracting gas is provided at one end of the gas monitoring device body (1) on which the frequency converter (104) is installed, and an exhaust mechanism for exhausting gas is provided at a side of the gas monitoring device body (1) away from the exhaust mechanism (2), and the exhaust mechanism is connected to three storage mechanisms (4) for collecting gas.

2. A confined space gas monitoring device as claimed in claim 1, characterized in that: The air extraction mechanism (2) comprises an air pump (201), a guide tube (202) and a metal hose (205); the air outlet end of the air pump (201) is butted against the air inlet end of the gas monitoring device body (1), the air pump (201) is fixedly connected to the gas monitoring device body (1), and the air inlet end of the air pump (201) is fixedly connected to the guide tube (202).

3. A confined space gas monitoring device as claimed in claim 2, characterized in that: The end of the guide tube (202) away from the air pump (201) is fixedly connected to a metal hose (205), the end of the guide tube (202) close to the air pump (201) is fixedly installed with an electromagnetic one-way valve (203), and the middle section of the guide tube (202) is fixedly installed with a first electromagnetic valve (204).

4. A confined space gas monitoring device as claimed in claim 3, characterized in that: The exhaust mechanism comprises a flow guide pipe (3), three second solenoid valves (301) and three docking joints (302); the flow guide pipe (3) is docked with the exhaust end of the gas monitoring device body (1), the flow guide pipe (3) is fixedly connected to the gas monitoring device body (1), and three shunt pipes are arranged on a side of the flow guide pipe (3) away from the gas monitoring device body (1).

5. A confined space gas monitoring device as claimed in claim 4, characterized in that: A second solenoid valve (301) is fixedly mounted on the middle sections of the three flow diversion pipes of the flow guide pipe (3), and the three flow diversion pipes are fixedly connected to the three docking joints (302) respectively.

6. A confined space gas monitoring device as claimed in claim 5, characterized in that: The inner walls of the three butt joints (302) are each provided with a first thread (303), and the outer walls of the three butt joints (302) are each provided with three second threads (304).

7. A confined space gas monitoring device as claimed in claim 6, characterized in that: The storage mechanism (4) comprises a threaded joint (401), an inner tube (402), a sealing valve (405) and a folding airbag (406); the inner side of the threaded joint (401) is fixedly connected to the inner tube (402), the outer surface of the inner tube (402) is provided with a first thread groove (403), and the inner wall of the threaded joint (401) is provided with a second thread groove (404).

8. A confined space gas monitoring device as claimed in claim 7, characterized in that: The sealing valve (405) is fixedly connected to the threaded joint (401), the inner tube (402) is in communication with the sealing valve (405), and one end of the sealing valve (405) away from the threaded joint (401) is fixedly connected to the folding airbag (406).

9. A confined space gas monitoring device as claimed in claim 8, characterized in that: A handle (103) is fixedly connected to both ends of the top surface of the gas monitoring device body (1); the threaded joint (401) is threadedly connected to the second thread (304) of the docking joint (302) via the second thread groove (404); the docking joint (302) is sleeved on the inner side of the threaded joint (401); the inner tube (402) is threadedly connected to the first thread (303) of the docking joint (302) via the first thread groove (403); and the inner tube (402) is sleeved on the inner side of the docking joint (302).

10. The method for using the confined space gas monitoring device as claimed in claim 9, characterized in that: The following steps are involved: S1: insert the metal hose (205) into the narrow space and start the device through the control panel (101); S2: The control panel (101) controls the air pump (201) to start, and the air pump (201) extracts gas in the space through the guide tube (202) and the metal hose (205) and introduces the gas into the gas monitoring device body (1) for monitoring. The second solenoid valve (301) located in the middle is in a normally open state, and cooperates with the folding air bag (406) to allow the air originally retained in the gas monitoring device body (1) to have space to be discharged; S3: When the gas monitoring device body (1) completes monitoring of the gas in the narrow space, it discharges the gas into the folding airbags (406) on the left and right sides according to the nature of the gas; if the gas monitoring device body (1) detects that the gas in the narrow space is toxic, it discharges the gas into the folding airbag (406) on the left side; if the gas is flammable, it discharges the gas into the folding airbag (406) on the right side; the gas is classified and stored; during the discharge, the corresponding second solenoid valve (301) is automatically opened by the control panel (101); after the discharge is completed, it is automatically closed; and at the same time, the second solenoid valve (301) located in the middle is automatically closed during the discharge.

Images