Mobile eco-friendly smoking room with internal and external circulation purification

Abstract

This invention discloses a mobile environmentally friendly smoking chamber with internal and external circulation purification, comprising: a smoking chamber body, the bottom of which is equipped with casters with directional locking; and an internal and external circulation switching mechanism, which includes ventilation pipes, multiple of which are staggered and installed on the top of the smoking chamber body, with an exhaust pipe and an internal air supply pipe fixedly installed at the bottom of each ventilation pipe. This invention employs a design that incorporates an airbag inside the internal and external circulation switching mechanism. When the switching mechanism is stationary, the airbag inflates and seals against the inner wall of the ventilation pipe; when the switching mechanism moves, the airbag automatically deflates and contracts, disengaging from the inner wall of the ventilation pipe. This design solves the technical problems of existing smoking chamber circulation switching mechanisms where the switching mechanism is constantly in contact with the pipe wall, leading to easy wear of the sealing surface and air leakage after long-term use. It achieves a significant reduction in the moving resistance of the switching mechanism and a significant extension of the service life of the sealing components and the entire machine while ensuring a zero-leakage sealing effect.

Description

Technical Field

[0001] This invention belongs to the field of flue gas treatment technology, and in particular relates to a mobile environmentally friendly smoking room with internal and external circulation purification. Background Technology

[0002] Currently, in public places and office areas, dedicated smoking rooms are usually set up to meet the needs of smokers and reduce the harm of secondhand smoke to non-smokers. Existing smoking rooms are mainly divided into two types: fixed and mobile. Among them, mobile smoking rooms are gradually gaining market favor due to their advantages such as flexible deployment and small footprint.

[0003] Existing mobile smoking rooms are typically equipped with air circulation and purification systems to filter the smoke inside. Depending on the operating mode, the circulation system can be divided into two types: internal circulation and external circulation. In internal circulation mode, the air inside the smoking room is purified and then returned to the room, which is suitable for scenarios where outdoor air quality is poor or where it is necessary to maintain indoor temperature and humidity. In external circulation mode, the air inside the smoking room is purified and then directly exhausted to the outside, which is suitable for scenarios where it is necessary to quickly remove smoke from the room.

[0004] However, existing smoking rooms still have the following shortcomings in actual use:

[0005] First, the design of the existing smoking room's circulation mode switching mechanism is unreasonable. To achieve the switching between internal and external circulation, a complex air duct structure and valve device are usually required. However, during the operation of traditional valves, there is always contact friction between the valve core and the inner wall of the valve body. After long-term use, this can easily lead to wear on the sealing surface, resulting in problems such as airflow leakage and poor sealing, which seriously affects the purification effect and operational stability of the circulation system.

[0006] Secondly, existing smoking rooms generally lack intelligent control over the movement of sealing components. During the movement of valves or switching components, the sealing components remain in constant pressure contact with the pipe wall, which not only increases the load on the drive mechanism but also accelerates the fatigue aging of the sealing components, shortening the service life of the equipment.

[0007] Therefore, we propose a mobile environmentally friendly smoking room with internal and external circulation purification. Summary of the Invention

[0008] To address the problems in the prior art, the present invention proposes the following technical solution:

[0009] The mobile, environmentally friendly smoking room with internal and external circulation purification system includes:

[0010] The smoking room body has casters with directional locking installed at its bottom;

[0011] An internal / external circulation switching mechanism includes ventilation pipes. Multiple ventilation pipes are staggered and installed on the top of the smoking room body. An exhaust pipe and an internal air supply pipe are fixedly installed at the bottom of the ventilation pipes, and an external air supply pipe is fixedly installed at the top. The external air supply pipe passes through the top of the smoking room body. An exhaust fan, an internal air supply fan, and an external air supply fan are respectively installed on the exhaust pipe, the internal air supply pipe, and the external air supply pipe. A linearly movable internal / external circulation switching component is installed inside the ventilation pipe. A cylinder and an air filter are respectively installed inside the ventilation pipe on both sides of the internal / external circulation switching component. The output end of the cylinder is fixedly connected to the internal / external circulation switching component to control the movement position of the internal / external circulation switching component. When the passage of the internal / external circulation switching component is aligned with the internal air supply pipe, it is internal circulation; when aligned with the external air supply pipe, it is external circulation. The air filter is used to filter the air drawn into the smoking room body by the exhaust fan.

[0012] An airbag is provided inside the internal and external circulation switching component. When the internal and external circulation switching component is stationary, the airbag is fully inflated and seals against the inner wall of the ventilation duct to prevent air from escaping from the gaps in the internal and external circulation switching component. When the internal and external circulation switching component is in motion, the airbag automatically deflates and disengages from the inner wall of the ventilation duct to reduce wear.

[0013] As a preferred embodiment of the above technical solution, a pick-up and drop-out port is provided on one side of the ventilation pipe, and a sealing plate is installed on the pick-up and drop-out port by bolts. The cylinder is detachably installed on the sealing plate.

[0014] As a preferred embodiment of the above technical solution, the bottom and top of the internal and external circulation switching component are respectively provided with an internal circulation channel and an external circulation channel. The inner ring of the internal circulation channel is fixedly fitted with an internal circulation duct, and the inner ring of the external circulation channel is fixedly fitted with an external circulation duct. The diameter of the internal circulation duct is adapted to the diameter of the internal air supply duct, and the diameter of the external circulation duct is adapted to the diameter of the external air supply duct, so as to facilitate air circulation.

[0015] As a preferred embodiment of the above technical solution, the internal and external circulation switching component is provided with a placement cavity, and the bottom and top of the internal and external circulation switching component are respectively provided with a sealing port one and a sealing port two communicating with the placement cavity. The airbag is placed in the placement cavity, and the airbag is in an inflated state and is sealed to the inner wall of the ventilation pipe through the placement cavity, sealing port one and sealing port two.

[0016] As a preferred embodiment of the above technical solution, the ventilation duct is internally equipped with a status detection unit, an inflation control unit, an air source, an exhaust control unit, and a controller. The status detection unit is used to detect the movement status of the internal and external circulation switching component. The inflation control unit is connected to the air source to control the gas entering the airbag. A pressure regulating valve is provided between the air source and the inflation control unit to regulate the gas pressure supplied to the airbag. The exhaust control unit is used to control the gas discharge from the airbag. The controller is signal-connected to the status detection unit, the inflation control unit, and the exhaust control unit, respectively.

[0017] The gas source inlet is equipped with a gas source processing triplet, which includes a filter, a pressure reducing valve, and an oil mist lubricator.

[0018] The controller is configured such that when the state detection unit detects that the internal and external circulation switching component is in a stationary state, it controls the inflation control unit to open to inflate the airbag. Before the internal and external circulation switching component moves, it first controls the exhaust control unit to open to exhaust the airbag and contract, and then controls the internal and external circulation switching component to start moving.

[0019] As a preferred embodiment of the above technical solution, the state detection unit is a position sensor, which is disposed on the inner and outer circulation switching component and is used to detect whether the inner and outer circulation switching component has reached a predetermined position.

[0020] The state detection unit is a pressure sensor, which is installed inside the internal and external circulation switching component to detect the pressure change inside the internal and external circulation switching component in order to determine the motion state of the internal and external circulation switching component.

[0021] The inflation control unit is an inflation solenoid valve, and the exhaust control unit is an exhaust solenoid valve. Both the inflation solenoid valve and the exhaust solenoid valve are normally closed solenoid valves, and the exhaust solenoid valve is connected to a muffler at its outlet.

[0022] As a preferred embodiment of the above technical solution, the position sensor is a proximity switch or a limit switch.

[0023] As a preferred embodiment of the above technical solution, the inflation control unit and the exhaust control unit are integrated into a two-position three-way solenoid valve, which has an inflation position and an exhaust position.

[0024] As a preferred embodiment of the above technical solution, the controller is a programmable logic controller or a microcontroller, and is equipped with a delay module. The delay module provides a preset safety delay after the exhaust control unit is turned on and before the internal and external circulation switching component starts to move.

[0025] As a preferred embodiment of the above technical solution, the airbag is made of wear-resistant rubber material, and its surface is provided with serrated protrusions and dents.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. This invention adopts a design that sets an airbag inside the internal and external circulation switching component, and inflates the airbag to seal against the inner wall of the ventilation pipe when the switching component is stationary, and automatically deflates and contracts to detach from the inner wall of the ventilation pipe when the switching component moves. This solves the technical problems of the existing smoking room circulation switching mechanism, which is prone to wear of the sealing surface due to constant contact and friction between the switching component and the pipe wall, and air leakage after long-term use. It achieves a significant reduction in the movement resistance of the switching component and a significant extension of the service life of the sealing component and the whole machine while ensuring zero leakage sealing effect.

[0028] 2. This invention adopts a design in which a cylinder drives the internal and external circulation switching component to move linearly within the ventilation duct. Combined with a specific layout structure of the exhaust duct, internal air supply duct, and external air supply duct, the internal or external circulation working mode can be flexibly switched by aligning the switching component's path with different air supply ducts. This solves the problems of cumbersome operation and complex duct structure in existing smoking rooms when switching circulation modes. It achieves the beneficial effects of quickly switching circulation modes as needed, improving air purification efficiency, and reducing energy consumption, allowing the smoking room to flexibly adjust the airflow direction according to environmental conditions and actual usage needs.

[0029] 3. The present invention adopts a design that allows for the detachable installation of cylinders, internal and external circulation switching components and internal pneumatic components by opening an access port on one side of the ventilation duct and using a sealing plate. This solves the problems of high maintenance costs and long downtime that require disassembling a large number of external structures during the inspection and maintenance of existing smoke chamber internal air ducts and switching mechanisms. It achieves the beneficial effect of quick inspection, replacement or maintenance of core switching components without disassembling the entire ventilation duct, greatly improving maintenance convenience and reducing equipment downtime.

[0030] 4. This invention adopts an intelligent control design that sets up a status detection unit, controller and inflation / deflation control unit inside the ventilation duct, and automatically executes the airbag inflation or deflation action according to the detected movement status of the switching component. This solves the problem that the sealing status in traditional smoking rooms cannot be automatically adjusted according to the actual working conditions, relies on manual judgment or has no control strategy at all. It realizes fully automatic and accurate management of airbag pressure, avoids the hidden danger of airbag damage due to excessive inflation pressure or insufficient sealing due to excessive pressure, and ensures the reliability and stability of the system in long-term operation.

[0031] 5. This invention integrates the inflation control unit and the deflation control unit into a two-position three-way solenoid valve, and with the help of a delay module, provides a preset safety delay before driving the switching component to move after the deflation is completed. This solves the problem that when the airbag is not completely deflated, the movement of the switching component still has frictional resistance, which affects the life of the seal and the smoothness of the action. It realizes the simplification of the air circuit structure and the precise control of the action sequence, effectively reduces the equipment failure rate, and improves the smoothness and reliability of the switching action. Attached Figure Description

[0032] Figure 1 The diagram shown is a structural schematic of the mobile environmentally friendly smoking room with internal and external circulation purification in the embodiment.

[0033] Figure 2 The diagram shown is a structural schematic of the internal and external circulation switching mechanism in the embodiment;

[0034] Figure 3 The diagram shown is a cross-sectional view of the ventilation duct in the embodiment;

[0035] Figure 4 The diagram shown is a structural schematic of the internal and external circulation switching component in the embodiment.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10. Smoking room body; 20. Internal and external circulation switching mechanism; 21. Ventilation duct; 22. Sealing plate; 23. Exhaust duct; 24. Exhaust fan; 25. Internal air supply duct; 26. Internal air supply fan; 27. External air supply duct; 28. External air supply fan; 29. ​​Internal and external circulation switching component; 291. Internal circulation channel; 292. Internal circulation duct; 293. External circulation channel; 294. External circulation duct; 295. Placement cavity; 296. Sealing port one; 297. Sealing port two; 210. Cylinder; 211. Air filter element. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0039] Example

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, the mobile environmentally friendly smoking room with internal and external circulation purification includes a smoking room body 10 and an internal and external circulation switching mechanism 20. The bottom of the smoking room body 10 is equipped with casters with directional locking.

[0041] Specifically, the casters allow the smoking room body 10 to move flexibly to different locations, while the directional locking function ensures that it stays stably in the working position, preventing accidental slippage during use, thus balancing ease of movement and safety of use.

[0042] The internal and external circulation switching mechanism 20 includes ventilation ducts 21. Multiple ventilation ducts 21 are staggered and installed on the top of the smoking chamber body 10. An exhaust duct 23 and an internal air supply duct 25 are fixedly installed at the bottom of each ventilation duct 21, and an external air supply duct 27 is fixedly installed at the top, penetrating the top of the smoking chamber body 10. An exhaust fan 24, an internal air supply fan 26, and an external air supply fan 27 are respectively installed on the exhaust duct 23, the internal air supply duct 25, and the external air supply duct 27. A linearly movable internal and external circulation mechanism is installed inside the ventilation ducts 21. The inner and outer circulation switching component 29 has cylinders 210 and air filters 211 installed inside the ventilation pipe 21 on both sides. The output end of the cylinder 210 is fixedly connected to the inner and outer circulation switching component 29 to control the movement position of the inner and outer circulation switching component 29. When the passage of the inner and outer circulation switching component 29 is aligned with the inner air supply pipe 25, it is inner circulation; when it is aligned with the outer air supply pipe 27, it is outer circulation. The air filter 211 is used to filter the air drawn into the smoking room body 10 by the exhaust fan 24.

[0043] The cylinder 210 drives the internal and external circulation switching component 29 to move linearly within the ventilation duct 21, allowing for flexible switching between internal and external circulation modes. During internal circulation, air is purified by the air filter 211 and then returned to the room. During external circulation, air is purified by the air filter 211 and then discharged outdoors, enabling on-demand switching, improving air purification efficiency and reducing energy consumption. The air filter 211 effectively removes smoke particles and odors, ensuring the cleanliness of the discharged or returned air.

[0044] An airbag is provided inside the internal and external circulation switching component 29. When the internal and external circulation switching component 29 is stationary, the airbag is fully inflated and fits tightly against the inner wall of the ventilation pipe 21 to prevent air from escaping from the gaps in the internal and external circulation switching component 29. When the internal and external circulation switching component 29 is in motion, the airbag automatically deflates and disengages from the inner wall of the ventilation pipe 21 to reduce wear.

[0045] Specifically, when stationary, the airbag inflates and tightens to achieve a zero-leakage circumferential seal, ensuring the accuracy and tightness of the airflow path after switching the circulation mode and preventing cross-flow. When moving, it actively exhausts and contracts, creating a gap between the inner and outer circulation switching component 29 and the ventilation pipe 21, significantly reducing sliding friction resistance, extending the service life of the inner and outer circulation switching component 29 and the ventilation pipe 21, and reducing the load on the cylinder 210.

[0046] like Figure 2 and Figure 3As shown, a pick-up and drop-out port is provided on one side of the ventilation pipe 21. A sealing plate 22 is installed on the pick-up and drop-out port by bolts. The cylinder 210 is detachably installed on the sealing plate 22.

[0047] Specifically, the access port, in conjunction with the removable sealing plate 22, facilitates quick inspection, replacement, or maintenance of the cylinder 210 and the internal / external circulation switching component 29 without disassembling the entire ventilation pipe 21, significantly improving maintenance convenience and reducing downtime.

[0048] like Figure 3 and Figure 4 As shown, the bottom and top of the internal and external circulation switching component 29 are respectively provided with an internal circulation channel 291 and an external circulation channel 293. The inner ring of the internal circulation channel 291 is fixedly fitted with an internal circulation duct 292, and the inner ring of the external circulation channel 293 is fixedly fitted with an external circulation duct 294. The diameter of the internal circulation duct 292 is matched with the diameter of the internal air supply duct 25, and the diameter of the external circulation duct 294 is matched with the diameter of the external air supply duct 27, so as to facilitate air circulation.

[0049] Specifically, the internal circulation duct 292 and the external circulation duct 294 are respectively matched with the diameters of the corresponding internal air supply duct 25 and external air supply duct 27 to ensure a smooth transition of the airflow channel during docking, reduce wind resistance and eddies, and improve air supply efficiency; at the same time, the duct sleeve structure enhances the rigidity of the channel and the sealing fit accuracy, ensuring the alignment reliability during long-term use.

[0050] like Figure 3 and Figure 4 As shown, the internal and external circulation switching component 29 is provided with a placement cavity 295, and the bottom and top of the internal and external circulation switching component 29 are respectively provided with a sealing port 296 and a sealing port 297 that communicate with the placement cavity 295. The airbag is placed in the placement cavity 295. When the airbag is inflated, it is sealed to the inner wall of the ventilation pipe 21 through the placement cavity 295, the sealing port 296 and the sealing port 297.

[0051] Specifically, the placement cavity 295 provides a stable installation space for the airbag, and the sealing port 1 296 and sealing port 297 serve as extension channels when the airbag inflates, enabling the airbag to simultaneously adhere to the tube wall from both the top and bottom directions, forming a full-circumferential, multi-part sealing contact, improving the uniformity and reliability of the seal, and avoiding leakage caused by insufficient sealing on one side.

[0052] like Figure 3 and Figure 4As shown, the ventilation duct 21 is internally equipped with a status detection unit, an inflation control unit, an air source, an exhaust control unit, and a controller. The status detection unit is used to detect the movement status of the internal / external circulation switching component 29. The inflation control unit is connected to the air source to control the gas entering the airbag. A pressure regulating valve (model QTY-15) is installed between the air source and the inflation control unit to regulate the gas pressure supplied to the airbag. The exhaust control unit is used to control the gas discharge from the airbag. The controller is connected to the status detection unit, the inflation control unit, and the exhaust control unit via signals. An air source processing triplet (model AC4000) is installed at the air source inlet. The air source processing triplet includes a filter, a pressure reducing valve, and an oil mist lubricator. The controller is configured as follows: when the status detection unit detects that the internal / external circulation switching component 29 is stationary, it controls the inflation control unit to open to inflate the airbag. Before the internal / external circulation switching component 29 is about to move, it first controls the exhaust control unit to open to deflate and contract the airbag, and then controls the internal / external circulation switching component 29 to start moving.

[0053] Specifically, the status detection unit senses the movement status of the internal and external circulation switching component 29 in real time, and the controller automatically executes inflation or deflation commands accordingly to achieve intelligent and automated airbag pressure management; the pressure regulating valve can set the working pressure of the airbag as needed to avoid damage to the airbag due to excessive pressure or failure to seal due to excessive pressure; the air source treatment triple unit filters, stabilizes, and lubricates the compressed air to ensure stable operation of pneumatic components and extend service life; the timing control of deflation first and movement later ensures that the airbag has contracted before each movement.

[0054] like Figure 3 and Figure 4 As shown, the status detection unit is a position sensor, which is installed on the internal and external circulation switching component 29 to detect whether the internal and external circulation switching component 29 has reached the predetermined position; the status detection unit is a pressure sensor, which is an MSP300 series pressure sensor, such as MSP300-016-B-5-W-1: a stainless steel single-piece integrated structure, without O-rings or welds, with a range of 0-10000Psi, an accuracy of ±1%, and an output of 0-100mV / 0.5-4.5V / 4-20mA selectable, with an operating temperature of -20℃-85℃. The pressure sensor is installed inside the internal and external circulation switching component 29 to detect the internal pressure change of the internal and external circulation switching component 29 to determine the movement status of the internal and external circulation switching component 29; the inflation control unit is an inflation solenoid valve, and the exhaust control unit is an exhaust solenoid valve. Both the inflation solenoid valve and the exhaust solenoid valve are normally closed solenoid valves. The exhaust solenoid valve's outlet is connected to a silencer, which is a KXY-50 model.

[0055] Specifically, the position sensor can accurately determine whether the internal and external circulation switching component 29 is in place, ensuring that the inflation action is performed only in the correct position and avoiding mis-inflation; the pressure sensor indirectly judges the motion state by detecting internal air pressure fluctuations, providing redundant detection methods and enhancing system reliability; the normally closed solenoid valve automatically closes when power is lost to prevent accidental leakage; and the muffler effectively reduces exhaust noise and improves the comfort of the working environment.

[0056] like Figure 3 and Figure 4 As shown, the position sensor is a proximity switch or a limit switch. The proximity switch model is APS-30-2N: M12×1 thread, detection distance 2mm, NPN output, response frequency 3kHz. The limit switch is waterproof, model TZ-3108SZ: protection level up to IP67 / IP68, mechanical life over 10 million cycles.

[0057] Specifically, proximity switches are contactless and have a fast response, making them suitable for frequent operation scenarios; limit switches are low-cost and provide direct signals. These two options can be adapted to different cost and accuracy requirements, providing flexible implementation solutions.

[0058] like Figure 3 and Figure 4 As shown, the inflation control unit and the deflation control unit are integrated into a two-position three-way solenoid valve. The model of the two-position three-way solenoid valve is 3V310-08-NC-BT: two-position three-way single solenoid valve, normally closed, DC24V. The two-position three-way solenoid valve has an inflation position and a deflation position.

[0059] Specifically, integrating it into a two-position three-way valve simplifies the gas circuit structure, reduces pipe joints and leakage points, and improves system compactness and response speed; switching the working position allows for quick switching between inflation and deflation, making the control logic simpler and reducing the failure rate.

[0060] like Figure 3 and Figure 4 As shown, the controller is a programmable logic controller or a microcontroller. The programmable logic controller is an S7-1200: a medium-sized PLC with integrated PROFINET industrial Ethernet, supporting complex logic control and multi-device linkage, and has strong expansion capabilities. The microcontroller is an STM32F103C8T6: ARM Cortex-M3 core, 72MHz main frequency, 64KB Flash, integrated USB, CAN and other resources, and is equipped with a delay module. The delay module provides a preset safety delay after the exhaust control unit is turned on and before the internal and external circulation switching component 29 starts to move.

[0061] Specifically, the use of PLC or microcontroller provides high reliability and flexible programming capabilities; the delay module ensures that the airbag has sufficient time to complete the exhaust and contraction, avoiding friction during movement due to incomplete exhaust, and further improving the life of the seals and the smoothness of the operation.

[0062] like Figure 3 and Figure 4 As shown, the airbag is made of wear-resistant rubber material, and its surface is provided with serrated protrusions and dents.

[0063] Specifically, the wear-resistant rubber provides good elasticity and fatigue resistance, making it suitable for frequent inflation and deflation conditions; the serrated texture increases the contact stress and sealing pressure with the pipe wall during inflation, while the texture can block the gas leakage path at the microscopic level, significantly improving the sealing effect. Furthermore, the texture reduces the contact area during contraction, further reducing movement resistance.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A mobile, environmentally friendly smoking room with internal and external circulation purification, characterized in that: include: The smoking room body (10) is equipped with casters with directional locking at the bottom; An internal and external circulation switching mechanism (20) includes ventilation pipes (21). Multiple ventilation pipes (21) are staggered and installed on the top of the smoking room body (10). An exhaust pipe (23) and an internal air supply pipe (25) are fixedly installed at the bottom of the ventilation pipes (21), and an external air supply pipe (27) is fixedly installed at the top. The external air supply pipe (27) penetrates the top of the smoking room body (10). An exhaust fan (24), an internal fan (26), and an external fan (28) are respectively installed on the exhaust pipe (23), the internal air supply pipe (25), and the external air supply pipe (27). The interior of the ventilation pipes (21) An internal and external circulation switching component (29) that can move linearly is installed. On both sides of the internal and external circulation switching component (29), a cylinder (210) and an air filter (211) are respectively installed inside the ventilation pipe (21). The output end of the cylinder (210) is fixedly connected to the internal and external circulation switching component (29) and is used to control the movement position of the internal and external circulation switching component (29). When the passage of the internal and external circulation switching component (29) is aligned with the internal air supply pipe (25), it is internal circulation. When it is aligned with the external air supply pipe (27), it is external circulation. The air filter (211) is used to filter the air drawn into the smoking room body (10) by the exhaust fan (24). An airbag is provided inside the internal and external circulation switching component (29). When the internal and external circulation switching component (29) is stationary, the airbag is fully inflated and seals against the inner wall of the ventilation pipe (21) to prevent air in the ventilation pipe (21) from escaping through the gaps in the internal and external circulation switching component (29). When the internal and external circulation switching component (29) is in motion, the airbag automatically vents and disengages from the inner wall of the ventilation pipe (21) to reduce wear.

2. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 1, characterized in that, The ventilation pipe (21) has a pick-up and drop-out port on one side, and a sealing plate (22) is installed on the pick-up and drop-out port by bolts. The cylinder (210) is detachably installed on the sealing plate (22).

3. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 1, characterized in that, The bottom and top of the internal and external circulation switching component (29) are respectively provided with an internal circulation channel (291) and an external circulation channel (293). The inner ring of the internal circulation channel (291) is fixedly fitted with an internal circulation duct (292), and the inner ring of the external circulation channel (293) is fixedly fitted with an external circulation duct (294). The diameter of the internal circulation duct (292) is matched with the diameter of the internal air supply duct (25), and the diameter of the external circulation duct (294) is matched with the diameter of the external air supply duct (27), which facilitates air circulation.

4. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 1, characterized in that, The internal and external circulation switching component (29) is provided with a placement cavity (295), and the bottom and top of the internal and external circulation switching component (29) are respectively provided with a sealing port one (296) and a sealing port two (297) that communicate with the placement cavity (295). The airbag is placed in the placement cavity (295). When the airbag is inflated, it is sealed to the inner wall of the ventilation pipe (21) through the placement cavity (295), the sealing port one (296) and the sealing port two (297).

5. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 4, characterized in that, The ventilation pipe (21) is equipped with a status detection unit, an inflation control unit, an air source, an exhaust control unit, and a controller. The status detection unit is used to detect the movement status of the internal and external circulation switching component (29). The inflation control unit is connected to the air source to control the gas entering the airbag. A pressure regulating valve is provided between the air source and the inflation control unit to regulate the gas pressure supplied to the airbag. The exhaust control unit is used to control the gas in the airbag to be discharged. The controller is connected to the status detection unit, the inflation control unit, and the exhaust control unit respectively. The gas source inlet is equipped with a gas source processing triplet, which includes a filter, a pressure reducing valve, and an oil mist lubricator. The controller is configured such that when the state detection unit detects that the internal and external circulation switching component (29) is in a stationary state, it controls the inflation control unit to open so that the airbag is inflated. Before the internal and external circulation switching component (29) is about to move, it first controls the exhaust control unit to open so that the airbag is vented and contracted, and then controls the internal and external circulation switching component (29) to start moving.

6. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 5, characterized in that, The state detection unit is a position sensor, which is set on the inner and outer circulation switching component (29) and is used to detect whether the inner and outer circulation switching component (29) has reached the predetermined position. The state detection unit is a pressure sensor, which is installed inside the internal and external circulation switching component (29) to detect the pressure change inside the internal and external circulation switching component (29) in order to determine the motion state of the internal and external circulation switching component (29); The inflation control unit is an inflation solenoid valve, and the exhaust control unit is an exhaust solenoid valve. Both the inflation solenoid valve and the exhaust solenoid valve are normally closed solenoid valves, and the exhaust solenoid valve is connected to a muffler at its outlet.

7. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 6, characterized in that, The position sensor is a proximity switch or a limit switch.

8. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 5, characterized in that, The inflation control unit and the exhaust control unit are integrated into a two-position three-way solenoid valve, which has an inflation position and an exhaust position.

9. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 5, characterized in that, The controller is a programmable logic controller or a microcontroller and is equipped with a delay module. The delay module provides a preset safety delay after the exhaust control unit is turned on and before the internal and external circulation switching component (29) starts to move.

10. The mobile environmentally friendly smoking room with internal and external circulation purification according to claim 4, characterized in that, The airbag is made of wear-resistant rubber material, and its surface is provided with serrated protrusions and dents.

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