A harmful gas dynamic monitoring and automatic ventilation device in limited operation space

Abstract

This invention discloses a dynamic monitoring and automatic ventilation device for hazardous gases in confined work spaces, relating to the field of gas monitoring technology. It includes: a portable integrated module comprising a body and an active suction generating unit and a gas detection unit installed on the body; an exhaust pipe assembly including a first air pipe for connecting to the inlet end of the first active suction generating unit and a second air pipe for connecting to the outlet end of the first active suction generating unit; a movable exhaust mechanism including a movable carrier and a bypass pipe connected at one end to the movable carrier; the movable carrier includes an elastic airbag for filling with gas and an inflation unit for inflation; the first air pipe is divided into secondary channels along its length; one end of the bypass pipe is fixed to the elastic airbag and has an open end, and one end of the bypass pipe is connected to the secondary channels; the detection end of the gas detection unit is connected to the secondary channels. This application improves the convenience of risk assessment and mitigation before confined space operations.

Description

Technical Field

[0001] This application relates to the field of gas monitoring technology, and in particular to a device for dynamic monitoring and automatic ventilation of harmful gases in a confined workspace. Background Technology

[0002] For power engineering projects, due to the needs of cable laying and maintenance, workers sometimes need to enter confined spaces such as pipe trenches and underground integrated pipe corridors. Because these scenarios are relatively enclosed, flammable, explosive, toxic and harmful substances may accumulate if they are not opened for a long time, posing a threat to the health and safety of the personnel entering. Therefore, relevant personnel often need to conduct a hazardous gas assessment before entering such areas and, after assessing the risks, implement measures such as wearing protective equipment and ventilation in accordance with regulations.

[0003] However, ventilation in confined spaces often relies on natural and passive ventilation after the entrances and vents are opened. This method has a relatively low efficiency in "purifying" the air in confined spaces and is affected by local weather conditions (such as temperature and wind speed). It is difficult for staff to accurately judge the ventilation effect and requires repeated testing. In actual operation, some staff will simply come back after a long time to save time, resulting in a lot of unnecessary time consumption. Therefore, this application proposes a new technical solution. Summary of the Invention

[0004] To improve the convenience of risk assessment and elimination before confined space operations and reduce unnecessary waiting time, this application provides a device for dynamic monitoring and automatic ventilation of harmful gases in confined work spaces.

[0005] This application provides a device for dynamic monitoring and automatic ventilation of hazardous gases in confined work spaces, employing the following technical solution:

[0006] A device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace, comprising:

[0007] A portable integrated module, comprising a main body and an active suction generating unit and a gas detection unit installed on the main body;

[0008] An air extraction pipe assembly, comprising an air pipe one for connecting to the air inlet of an active suction generating unit one, and an air pipe two for connecting to the air outlet of the active suction generating unit one; and,

[0009] A movable air extraction mechanism, comprising a movable carrier and a bypass pipe connected at one end to the movable carrier;

[0010] The active carrier includes an elastic airbag for filling with a gas with a density less than that of air and an inflation unit for inflation. The inflation unit is installed at the end of the air tube away from the active suction generating unit and is a timed triggering device or electrically connected to a wireless communication module.

[0011] The trachea is divided into a secondary channel along its length. The bypass tube is a flexible tube. One end of the bypass tube is fixed to the elastic airbag and has an open end. The end of the bypass tube away from the elastic airbag is connected to the secondary channel. The detection end of the gas detection unit is connected to the secondary channel.

[0012] Optionally, a circular foam support block is fixed to the bottom of the elastic airbag. The foam support block has a cavity inside. The side wall of the foam support block has multiple air inlets communicating with the cavity along its circumference. The open end of the bypass pipe is fixedly connected to the cavity of the foam support block. The foam support block is provided with an adjustment component for adjusting the gas to enter each air inlet in turn.

[0013] Optionally, the adjustment assembly includes an assembly ring, a fan blade, a rotating rod, and an arc-shaped plug. The assembly ring is annular and fixedly inserted through the side wall of the foam support block. One end of the assembly ring, facing away from the foam support block, extends outward and is fixedly inserted through the opening end of the bypass pipe. A support rod is fixedly connected to the assembly ring radially. The support rod is rotatably connected to a central shaft. The fan blade is coaxially fixed with the central shaft, so that the fan blade is located at the center of the opening of the bypass pipe. The rotating rod is arranged radially along the assembly ring, with one end fixedly connected to the central shaft and the other end fixed to the arc-shaped plug. The arc-shaped plug is arc-shaped and its center is concentric with the central shaft. There is a gap between the arc-shaped protruding surface of the arc-shaped plug and the inner wall of the foam support block, and the position of the arc-shaped plug corresponds to the air inlet.

[0014] Optionally, the interior of the machine body is hollow. The first active suction generating unit includes a battery, a motor, a fan, and a filter plate. The filter plate is fixedly connected inside the machine body. The battery and the motor are both located inside the machine body and below the filter plate. The first fan is rotatably connected to the upper surface of the filter plate. The output shaft of the motor passes through the filter plate and is coaxially fixed with the fan. The battery is electrically connected to the motor. The end of the first air pipe extends into the interior of the machine body and its port is fixed to the lower surface of the filter plate. The filter plate and the port of the first air pipe have multiple filter holes. The port of the second air pipe communicates with the interior of the machine body.

[0015] Optionally, the portable integrated module further includes an active suction generating unit two, which includes a handwheel, a connecting rod, a second fan, and a bracket. The bracket is fixedly connected inside the body and located above the first fan. The second fan is rotatably connected to the bracket. The connecting rod rotates vertically through the body, with its upper end extending out of the body and fixed to the handwheel. The lower end of the connecting rod is coaxially fixed to the second fan.

[0016] Optionally, the inflation unit includes an inflation tank, a solenoid valve, a pressure relief valve, and a controller. The inflation tank is connected to a flexible tube, the elastic airbag is fixedly connected to an air nozzle, the tube is fixedly connected to the air nozzle, the solenoid valve is located in the inflation tank and is used to switch the gas supply on and off, the pressure relief valve is installed on the tube, and the controller is electrically connected to the solenoid valve, the pressure relief valve, and the wireless communication module.

[0017] The controller is configured as follows:

[0018] When a user-initiated command to start the detection is received, the timer starts based on the current moment;

[0019] When the timing reaches the preset ground detection time, the solenoid valve is controlled to execute the opening command;

[0020] When a user-initiated command indicating that the test is complete is received, the pressure relief valve is controlled to execute the pressure relief command.

[0021] Optionally, the inflation unit further includes a counterweight base, which has a slot for the bottom of the inflation tank to be inserted.

[0022] Optionally, the counterweight seat is fixedly connected to a limiting clamp, which is sleeved on the air pipe.

[0023] In summary, this application includes the following beneficial technical effects: Initially, when the air tube and the elastic airbag are placed in the confined working space, the elastic airbag is not inflated. The active suction generating unit actively draws air from the confined working space and discharges it to the outside for ventilation. At the same time, the bypass pipe collects air near the ground, and the gas detection unit detects harmful gases in the collected air. After the elastic airbag has been drawing air near the ground for a certain period of time, the inflation unit inflates the elastic airbag, causing the elastic airbag to lift the bypass pipe along with it. This allows the gas in the upper area of ​​the confined working space to enter the bypass pipe and be collected and detected by the gas detection unit. This not only detects the local area within the confined working space but also detects the gas in different areas, improving detection accuracy and enhancing the convenience of risk assessment and mitigation before confined space operations. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the internal structure of the machine body in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the connection structure between the foam support block and the bypass pipe in an embodiment of this application.

[0027] Figure 4This is a schematic diagram of the internal structure of the foam support block in an embodiment of this application.

[0028] Figure 5 This is a connection block diagram of the controller in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Portable integrated module; 2. Movable suction mechanism; 11. Main body; 12. Active suction generating unit one; 13. Gas detection unit; 14. Air tube one; 15. Air tube two; 21. Elastic airbag; 22. Inflation unit; 23. Bypass pipe; 24. Foam support block; 25. Air inlet; 3. Adjustment component; 31. Assembly ring; 32. Fan blade; 33. Rotating rod; 34. Arc-shaped block; 35. Support rod; 221. Air tank; 222. Solenoid valve; 223. Pressure relief valve; 224. Controller; 225. Counterweight seat; 226. Limiting clamp; 121. Battery; 122. Motor; 123. Fan one; 124. Filter plate; 4.1 Handwheel; 42. Connecting rod; 43. Fan two; 44. Bracket. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a device for dynamic monitoring and automatic ventilation of harmful gases in a confined workspace.

[0032] Reference Figure 1 and Figure 2 A device for dynamic monitoring and automatic ventilation of harmful gases in a confined workspace includes a portable integrated module 1, an exhaust pipe assembly, and a movable exhaust mechanism 2.

[0033] The portable integrated module 1 includes a hollow body 11 and an active suction generating unit 12 and a gas detection unit 13 installed inside the body 11. The active suction generating unit 12 is used to draw out the gas in the limited working space. The gas detection unit 13 includes a gas sensor installed inside the body 11 to detect the concentration of harmful gases in the air. The gas sensor can also be electrically connected to a display screen, which is installed on the outer shell of the body 11 for easier and more intuitive viewing of the detection data.

[0034] The air extraction tube assembly includes an air tube 14 for connecting to the air inlet end of the active suction generating unit 12 and an air tube 2 15 for connecting to the air outlet end of the active suction generating unit 12. Both air tubes 14 and 15 are made of flexible tubing, and each end of them can be detachably connected to an additional external tube through an installation tube interface, thereby extending the length of the air tube as needed. This allows the operator to place the machine body 11 outside the limited working space and extend the air tube 14 into the limited working space. Furthermore, the external tube can be removed for easy carrying.

[0035] Reference Figure 1 and Figure 2 The active suction mechanism 2 includes an active carrier and a bypass pipe 23 connected to the active carrier at one end. The active carrier includes an elastic airbag 21 for filling with a gas (such as helium) with a density less than air and an inflation unit 22 for inflation. The inflation unit 22 is installed at the end of the air pipe 14 away from the active suction generating unit 12 and is a timed triggering device or electrically connected to a wireless communication module, such as a 4 / 5G / Bluetooth module.

[0036] The trachea 14 is separated into a secondary channel by a partition along its length. The bypass tube 23 is a flexible tube made of plastic film, making it lightweight. One end of the bypass tube 23 is fixed to the elastic airbag 21 and is open at the end. The other end of the bypass tube 23 is connected to the secondary channel. When the elastic airbag 21 is filled with helium by the inflation unit 22, it can cause the bypass tube 23 to float upward. Under the suction action of the active suction generating unit 12, the gas in the upper area is drawn into the bypass tube 23 and enters the secondary channel. The detection end of the gas detection unit 13 is connected to the secondary channel to sample and detect the inhaled gas. It should be noted that, in order to improve sampling efficiency, the end of the secondary channel away from the active suction generating unit 12 is sealed, while the end of the trachea 14 away from the active suction generating unit 12 is open, so that the active suction generating unit 12 can draw out the air in the limited working space.

[0037] With the above setup, when the air tube 14 and the elastic airbag 21 are initially placed in the confined working space, the elastic airbag 21 is not inflated. The active suction generating unit 12 actively draws air from the confined working space and discharges it to the outside for ventilation. At the same time, the bypass pipe 23 collects air near the ground, and the gas detection unit 13 detects harmful gases in the collected air. After the elastic airbag 21 has been drawing air near the ground for a certain period of time, the inflation unit 22 inflates the elastic airbag 21, causing the elastic airbag 21 to lift the bypass pipe 23 together. This allows the gas in the upper area of ​​the confined working space to enter the bypass pipe 23 and be collected and detected by the gas detection unit 13. This not only detects local areas within the confined working space but also detects gases in different areas, improving detection accuracy and enhancing the convenience of risk assessment and mitigation before confined space operations.

[0038] Reference Figure 3 and Figure 4In another embodiment of this application, considering that the bypass pipe 23 has only one opening at its upper end, when the active suction generating unit 12 draws air, due to the air pressure difference, the bypass pipe 23 will cause the elastic airbag 21 to tilt downwards, which may cause the elastic airbag 21 to scrape against or get stuck in other facilities in the limited working space, affecting the upward movement of the elastic airbag 21. Therefore, this application is configured as follows:

[0039] The bottom of the elastic airbag 21 is fixed with a circular cross-section foam support block 24. The foam support block 24 has a cavity inside. The side wall of the foam support block 24 has multiple air inlets 25 that communicate with the cavity. The open end of the bypass pipe 23 is fixedly connected to the cavity of the foam support block 24. The foam support block 24 is provided with an adjustment component 3 for adjusting the gas to enter each air inlet 25 in turn.

[0040] The adjusting assembly 3 includes an assembly ring 31, a fan blade 32, a rotating rod 33, and an arc-shaped blocking block 34. The assembly ring 31 is annular and is fixedly attached to the inner wall of the foam support block 24 by adhesive. The end of the assembly ring 31 opposite to the foam support block 24 extends outward and is fixedly attached to the opening end of the bypass pipe 23 by adhesive. A support rod 35 is fixedly connected to the assembly ring 31 radially. The support rod 35 is rotatably connected to a vertical central shaft via a bearing. The fan blade 32 is coaxially fixed with the central shaft, so that the fan blade 32 is located at the center of the opening of the bypass pipe 23.

[0041] The rotating rod 33 is arranged radially along the assembly ring 31, with one end fixedly connected to the central shaft and the other end fixed to the arc-shaped block 34. The arc-shaped block 34 is arc-shaped with its center concentric with the central shaft. There is a gap between the arc-shaped protruding surface of the arc-shaped block 34 and the inner wall of the foam support block 24, and the arc-shaped block 34 corresponds to the position of the air inlet 25. The arc-shaped block 34 can cover several air inlets 25 at the same time. It should be noted that the above components are all made of lightweight plastic and will not affect the floating of the elastic airbag 21.

[0042] With the above setup, after the elastic airbag 21 floats up, the active suction generating unit 12 draws in air. The airflow enters the bypass pipe 23 through multiple air inlets 25 of the foam support block 24, which drives the fan blade 32 and the central shaft to rotate. This, in turn, drives the rotating rod 33 and the arc-shaped blocking block 34 to rotate in the cavity of the foam support block 24. The arc-shaped blocking block 34 sequentially covers and blocks the air inlets 25, so that the airflow is not limited to entering from a certain fixed air inlet 25, but can enter the air inlets 25 in different directions in turn. This causes the elastic airbag 21 to swing back and forth in the air. At the same time, the back and forth swing of the elastic airbag 21 can also be used to mix the air in the limited working space, thereby improving the overall detection effect.

[0043] Reference Figure 1 and Figure 5In another embodiment of this application, the inflation unit 22 includes an inflation tank 221, a solenoid valve 222, a pressure relief valve 223, and a controller 224. The inflation tank 221 is filled with helium and is connected to a flexible tube. The elastic airbag 21 is fixedly connected to an air nozzle, and the tube and the air nozzle are fixedly connected. The solenoid valve 222 is disposed in the inflation tank 221 for switching the gas on and off. The pressure relief valve 223 is installed on the tube. The controller 224 is electrically connected to the solenoid valve 222, the pressure relief valve 223, and the wireless communication module. The controller 224 can be a PLC controller 224 or an MCU controller 224.

[0044] The controller 224 is configured as follows:

[0045] 1) When a user-initiated command to start the detection is received, the timer will start based on the current moment;

[0046] It is understandable that when the operator turns on the active suction generating unit 12, the detection start command is triggered. The detection start command refers to the operator operating the remote control that is pre-connected via a wireless communication module. The remote control has physical buttons. By pressing the detection start button, the detection start command can be triggered, and the pressure relief valve 223 will be closed.

[0047] 2) When the timing reaches the preset ground detection time (e.g., 15 minutes), the solenoid valve 222 is controlled to execute the opening command;

[0048] It is understandable that the opening command means that the inflation tank 221 inflates the elastic airbag 21, and the solenoid valve 222 is closed when the inflation time reaches a preset time, such as 5 seconds, or other inflation time that has been tested and can ensure that the elastic airbag 21 floats.

[0049] 3) When a user-initiated test completion command is received, the pressure relief valve 223 is controlled to execute the pressure relief command.

[0050] It is understandable that when the operator presses the "Detection Complete" button on the remote control, the "Detection Complete" command is triggered; the "Pressure Relief" command refers to controlling the pressure relief valve 223 to open, causing the elastic airbag 21 to deflate.

[0051] Reference Figure 1 In another embodiment of this application, in order to prevent the inflation tank 221 from shifting, the inflation unit 22 further includes a counterweight 225. The counterweight 225 has a slot for the bottom of the inflation tank 221 to be inserted into, and the counterweight 225 is fixedly connected to a limiting clamp 226. The limiting clamp 226 is sleeved on the air tube 14, thereby preventing the air tube 14 from being lifted by the elastic airbag 21 and affecting the air pumping effect.

[0052] Reference Figure 2In another embodiment of this application, the active suction generating unit 12 includes a battery 121, a motor 122, a fan 123, and a filter plate 124. The filter plate 124 is fixedly connected inside the body 11. The battery 121 and the motor 122 are both disposed inside the body 11 and located below the filter plate 124. The fan 123 is rotatably connected to the upper surface of the filter plate 124 through a bearing. The output axis of the motor 122 passes through the filter plate 124 and is coaxially fixed with the fan 123. The battery 121 is electrically connected to the motor 122 through a wire to supply power to the motor 122. The battery 121 also supplies power to the gas detection unit 13 and the controller 224 mentioned above. For ease of installation, the bottom of the body 11 has a base plate that can be removed by screws.

[0053] The end of the first air pipe 14 extends into the body 11 and the port is fixed to the lower surface of the filter plate 124. Multiple filter holes are provided at the connection surface between the filter plate 124 and the port of the first air pipe 14 to filter out impurities and prevent damage to the first fan 123. The port of the second air pipe 15 is connected to the inside of the body 11.

[0054] With the above settings, the motor 122 drives the fan 123 to rotate, which generates negative pressure inside the machine body 11, thereby drawing air from the limited working space into the air pipe 14, and after being filtered by the filter plate 124, it is discharged from the air pipe 15.

[0055] In another embodiment of this application, considering that it can still be used in an emergency when the battery 121 is out of power, the portable integrated module 1 also includes an active suction generating unit 2. The active suction generating unit 2 includes a handwheel 41, a connecting rod 42, a second fan 43, and a bracket 44. The bracket 44 is horizontally fixed inside the body 11 and located above the first fan 123. The second fan 43 is rotatably connected to the lower surface of the bracket 44 through a bearing. The connecting rod 42 is rotatably inserted through the body 11 in a vertical direction, and the upper end of the connecting rod 42 extends out of the body 11 and is fixed to the handwheel 41. The lower end of the connecting rod 42 is coaxially fixed with the second fan 43.

[0056] With the above settings, even if the battery 121 suddenly runs out of power, the operator can still drive the fan 43 to rotate by hand cranking the handwheel 41, thereby actively ventilating the limited working space.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for dynamic monitoring and automatic ventilation of harmful gases in a confined workspace, characterized in that: include: The portable integrated module (1) includes a body (11) and an active suction generating unit (12) and a gas detection unit (13) installed on the body (11). The suction pipe assembly includes a first air pipe (14) for connecting to the air inlet of the first active suction generating unit (12), a second air pipe (15) for connecting to the air outlet of the first active suction generating unit (12); and, The movable air extraction mechanism (2) includes a movable carrier and a bypass pipe (23) connected to the movable carrier at one end. The active carrier includes an elastic airbag (21) for filling with a gas with a density less than that of air and an inflation unit (22) for inflation. The inflation unit (22) is installed at the end of the air tube (14) away from the active suction generating unit (12) and is a timed triggering device or electrically connected to a wireless communication module. The trachea (14) is divided into a secondary channel along its length. The bypass tube (23) is a flexible tube. One end of the bypass tube (23) is fixed to the elastic airbag (21) and the end is open. The end of the bypass tube (23) away from the elastic airbag (21) is connected to the secondary channel. The detection end of the gas detection unit (13) is connected to the secondary channel.

2. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined working space according to claim 1, characterized in that: The bottom of the elastic airbag (21) is fixed with a foam support block (24) with a circular cross section. The foam support block (24) has a cavity inside. The side wall of the foam support block (24) has multiple air inlets (25) communicating with the cavity along its circumference. The opening end of the bypass pipe (23) is fixedly connected to the cavity of the foam support block (24). The foam support block (24) is provided with an adjustment component (3) for adjusting the gas to enter each air inlet (25) in turn.

3. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace according to claim 2, characterized in that: The adjusting component (3) includes an assembly ring (31), a fan blade (32), a rotating rod (33), and an arc-shaped block (34). The assembly ring (31) is annular and fixedly inserted through the side wall of the foam support block (24). The end of the assembly ring (31) facing away from the foam support block (24) extends outward and is fixedly inserted through the opening end of the bypass pipe (23). A support rod (35) is fixedly connected to the assembly ring (31) radially. The support rod (35) is rotatably connected to a central shaft. The fan blade (32) is... 2) The fan blade (32) is fixed coaxially with the central shaft so that the fan blade (32) is located at the center of the opening of the bypass pipe (23). The rotating rod (33) is arranged radially along the assembly ring (31), and one end of the rotating rod (33) is fixedly connected to the central shaft, and the other end is fixed to the arc-shaped block (34). The arc-shaped block (34) is arc-shaped and its center is concentric with the central shaft. There is a gap between the arc-shaped protruding surface of the arc-shaped block (34) and the inner wall of the foam support block (24), and the position of the arc-shaped block (34) corresponds to the air inlet (25).

4. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace according to claim 1, characterized in that: The interior of the body (11) is hollow. The active suction generating unit (12) includes a battery (121), a motor (122), a fan (123), and a filter plate (124). The filter plate (124) is fixedly connected inside the body (11). The battery (121) and the motor (122) are both located inside the body (11) and below the filter plate (124). The fan (123) is rotatably connected to the upper surface of the filter plate (124). On the side, the output shaft of the motor (122) passes through the filter plate (124) and is coaxially fixed with the fan (123). The battery (121) is electrically connected to the motor (122). The end of the air pipe (14) extends into the body (11) and the port is fixed on the lower surface of the filter plate (124). The filter plate (124) and the port of the air pipe (14) are provided with multiple filter holes. The port of the air pipe (15) is connected to the inside of the body (11).

5. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace according to claim 4, characterized in that: The portable integrated module (1) also includes an active suction generating unit two, which includes a handwheel (41), a connecting rod (42), a second fan (43) and a bracket (44). The bracket (44) is fixedly connected inside the body (11) and located above the first fan (123). The second fan (43) is rotatably connected to the bracket (44). The connecting rod (42) rotates vertically through the body (11), and the upper end of the connecting rod (42) extends out of the body (11) and is fixed with the handwheel (41). The lower end of the connecting rod (42) is coaxially fixed with the second fan (43).

6. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace according to claim 1, characterized in that: The inflation unit (22) includes an inflation tank (221), a solenoid valve (222), a pressure relief valve (223), and a controller (224). The inflation tank (221) is connected to a flexible tube. The elastic airbag (21) is fixedly connected to an air nozzle. The tube is fixedly connected to the air nozzle. The solenoid valve (222) is located in the inflation tank (221) and is used to switch the gas on and off. The pressure relief valve (223) is installed on the tube. The controller (224) is electrically connected to the solenoid valve (222), the pressure relief valve (223), and the wireless communication module. The controller (224) is configured as follows: When a user-initiated command to start the detection is received, the timer starts based on the current moment; When the timing duration reaches the preset ground detection duration, the solenoid valve (222) is controlled to execute the opening command; When a user-initiated test completion command is received, the pressure relief valve (223) is controlled to execute the pressure relief command.

7. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace according to claim 6, characterized in that: The inflation unit (22) also includes a counterweight (225), which has a slot for the bottom of the inflation tank (221) to be inserted.

8. The device for dynamic monitoring and automatic ventilation of hazardous gases in a confined workspace according to claim 7, characterized in that: The counterweight (225) is fixedly connected to a limiting clamp (226), which is sleeved on the air tube (14).

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