Gas sampling device

Abstract

The invention relates to the technical field of environment monitoring, in particular to a gas sampling device. The gas sampling device comprises a main body, the main body is internally provided with a gas inlet passage and a gas outlet passage, and the gas inlet passage is provided with a detection piece; the connecting passage is arranged in the main body; the cleaning passage is arranged in the main body, a filter assembly is arranged on the cleaning passage, and the filter assembly comprises a filter element and a heating structure; the blowdown passage is arranged in the main body, and one end of the blowdown passage extends out of the main body; the switching assembly is arranged in the main body, the switching assembly has three states, when the switching assembly is in the first state, the air inlet channel communicates with the air outlet channel through the connecting channel, when the switching assembly is in the second state, the air inlet channel communicates with the air outlet channel through the cleaning channel, and when the switching assembly is in the third state, the air inlet channel communicates with the air outlet channel through the cleaning channel. The air outlet passage is communicated with one end of the cleaning passage, and the other end of the cleaning passage is communicated with the blowdown passage.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology, and specifically to a gas sampling device. Background Technology

[0002] In the field of environmental monitoring, it is necessary to accurately collect external gas samples using vehicle-mounted equipment to provide reliable data for air quality assessment and support environmental governance decisions. In emergency rescue scenarios, rescue vehicles need to quickly and accurately obtain gas information around the accident site in order to take appropriate rescue measures, ensure the safety of rescue personnel, and improve rescue efficiency. In toxic gas protection work, relevant vehicles must be able to collect external gases in a timely manner, monitor the concentration and distribution of toxic gases, and provide a basis for the formulation of protection strategies.

[0003] However, vehicle-mounted gas sampling devices used in these scenarios have many drawbacks. Once the filter of the traditional sampling gas path becomes clogged, it relies on manual replacement. In emergency rescue and toxic gas protection operations where every second counts, the failure to replace the filter in time may interrupt critical gas monitoring, delay rescue opportunities, and also affect the consistency and accuracy of data in environmental monitoring. Summary of the Invention

[0004] In view of this, the present invention provides a gas sampling device to solve the problem that filter clogging relies on manual replacement, which can interrupt critical gas monitoring and delay rescue opportunities due to untimely filter replacement, and also affect the consistency and accuracy of data in environmental monitoring.

[0005] This invention provides a gas sampling device, comprising:

[0006] The main body has an air inlet passage and an air outlet passage, and a detection element is provided on the air inlet passage;

[0007] A connection path is disposed within the main body;

[0008] A cleaning passage is provided within the main body, and a filter assembly is provided on the cleaning passage, the filter assembly including a filter element and a heating structure;

[0009] A sewage discharge passage is provided inside the main body, with one end of the sewage discharge passage extending out of the main body;

[0010] A switching component is disposed within the main body. The switching component has three states. In the first state, the air intake passage and the air outlet passage are connected through the connecting passage. In the second state, the air intake passage and the air outlet passage are connected through the cleaning passage. In the third state, the air outlet passage is connected to one end of the cleaning passage, and the other end of the cleaning passage is connected to the sewage discharge passage.

[0011] Beneficial effects:

[0012] By switching different states using the switching components, the gas sampling device in this embodiment possesses sampling and detection functions, self-cleaning functions, and filter element recovery functions. This improves the automation level of the gas sampling device, reduces the need for manual intervention, and ensures the continuity and accuracy of gas monitoring, especially in emergency situations such as emergency rescue and toxic gas protection. It also avoids monitoring interruptions caused by filter element blockage, thereby improving sampling efficiency and safety.

[0013] In one optional embodiment, one end of the connection passage is connected to the air intake passage, and the switching component includes a first switching element and a second switching element. The first switching element is connected to the air outlet passage, and the air outlet passage is adapted to be connected to the other end of the connection passage or one end of the cleaning passage through the first switching element. The second switching element is connected to the other end of the cleaning passage, and the other end of the cleaning passage is adapted to be connected to the other end of the air intake passage or the sewage discharge passage through the second switching element.

[0014] Beneficial effects:

[0015] The cooperation of the first and second switching components makes the gas sampling device more flexible in switching between sampling and detection, self-cleaning and filter element recovery functions, further improving the degree of automation, reducing the complexity of operation, and improving the overall work efficiency and reliability.

[0016] In one alternative implementation, the first switching element and the second switching element are rotary valves.

[0017] Beneficial effects:

[0018] Using a rotary valve as the switching element results in a simple structure, convenient operation, and fast switching speed. Furthermore, the rotary valve has good sealing performance, which can prevent gas leakage and ensure the sampling accuracy and reliability of the gas sampling device.

[0019] In one alternative embodiment, an air extraction device is further included, which is respectively disposed in the connection passage and the cleaning passage.

[0020] Beneficial effects;

[0021] The installation of the gas extraction device ensures smooth gas flow during sampling, detection, and self-cleaning, guaranteeing stable operation of the gas sampling device while improving sampling efficiency and cleaning effectiveness.

[0022] In one alternative embodiment, the air extraction device is an air pump.

[0023] Beneficial effects:

[0024] Using an air pump as the extraction device has the advantages of simple structure, reliable operation, and easy maintenance. In addition, the air pump can provide a stable airflow, which further ensures the sampling accuracy and cleaning effect of the gas sampling device.

[0025] In one alternative embodiment, a control system is further included, which is signal-connected to the switching component, the detection element, and the pumping device, respectively.

[0026] Beneficial effects;

[0027] By setting up the control system, intelligent control of the gas sampling device is realized, enabling the switching components, detection devices, and pumping devices to work together, further improving the automation level and sampling accuracy of the gas sampling device. At the same time, the control system can also adjust the sampling strategy in real time based on the gas information detected by the detection devices, improving sampling efficiency and accuracy.

[0028] In one alternative embodiment, the filter assembly further includes a heat insulation layer disposed outside the filter element and the heating structure, the heat insulation layer being adapted to accommodate the filter element and the heating structure.

[0029] Beneficial effects;

[0030] By setting up an insulation layer, heat loss during the heating process of the filter element is reduced, heating efficiency is improved, and impurities on the filter element can be removed more quickly. At the same time, the insulation layer also protects the filter element and the heating structure, extending their service life.

[0031] In one optional embodiment, the main body further has an air inlet and an air outlet, each having a filter structure.

[0032] Beneficial effects;

[0033] By setting up filter structures at the air inlet and outlet, the purity of the gas entering the gas sampling device can be further guaranteed, avoiding contamination of the internal components of the device by impurities. At the same time, it can also prevent gas leakage inside the device, ensuring the sampling accuracy and reliability of the gas sampling device.

[0034] In one optional embodiment, a rain shield is further included, which is disposed at the air inlet and the air outlet. The rain shield has a ventilation channel, one end of which is connected to the air inlet or the air outlet, and the other end of which opens towards the ground.

[0035] Beneficial effects:

[0036] By incorporating a rain shield, rainwater and other liquids are effectively prevented from entering the gas sampling device, thus avoiding damage to the device or a decrease in sampling accuracy caused by liquid ingress. At the same time, the ventilation channel design within the rain shield ensures smooth gas flow and does not affect sampling efficiency.

[0037] In one optional embodiment, the rain shield is detachably connected to the main body, the rain shield has a slot, and the filter structure is disposed in the ventilation duct through the slot.

[0038] Beneficial effects:

[0039] The detachable connection between the rain shield and the main body allows users to easily remove and install the rain shield, facilitating cleaning or replacement. Meanwhile, the slot design makes the installation and removal of the filter structure simpler, allowing users to quickly replace the filter structure according to actual needs, ensuring the continuous and stable operation of the gas sampling device. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the switching component in the gas sampling device according to an embodiment of the present invention when it is in the first state;

[0042] Figure 2 This is a schematic diagram of the switching component in the gas sampling device according to an embodiment of the present invention when it is in the second state;

[0043] Figure 3 This is a schematic diagram of the switching component in the gas sampling device according to an embodiment of the present invention when it is in the third state.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Main body; 2. Air inlet passage; 3. Air outlet passage; 4. Detection component; 5. Connection passage; 6. Cleaning passage; 7. Filter assembly; 701. Filter element; 702. Heating structure; 703. Insulation layer; 8. Sewage discharge passage; 9. First switching component; 10. Second switching component; 11. Air extraction device; 12. Air inlet; 13. Air outlet; 14. Filter structure; 15. Rainproof component; 16. Ventilation duct; 17. Slot. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0048] According to an embodiment of the present invention, a gas sampling device is provided, comprising: a main body 1, a connection passage 5, a cleaning passage 6, a sewage discharge passage 8, and a switching component.

[0049] Specifically, the main body 1 has an air inlet passage 2 and an air outlet passage 3, with a detection element 4 installed on the air inlet passage 2. A connection passage 5 is located within the main body 1. A cleaning passage 6 is located within the main body 1, and a filter assembly 7 is installed on the cleaning passage 6. The filter assembly 7 includes a filter element 701 and a heating structure 702. A sewage discharge passage 8 is located within the main body 1, with one end extending out of the main body 1. A switching assembly is located within the main body 1 and has three states. In the first state, the air inlet passage 2 and the air outlet passage 3 are connected through the connection passage 5. In the second state, the air inlet passage 2 and the air outlet passage 3 are connected through the cleaning passage 6. In the third state, the air outlet passage 3 is connected to one end of the cleaning passage 6, and the other end of the cleaning passage 6 is connected to the sewage discharge passage 8.

[0050] In this embodiment, the main body 1 can be placed inside a mobile trolley for movement, thereby entering the accident scene to collect gas information. The main body 1 has an air inlet 12 and an air outlet 13. An air inlet passage 2 and an air outlet passage 3 are respectively connected to the air inlet 12 and the air outlet 13. A detection element 4 is provided on the air inlet passage 2, which can detect gas information within the air inlet passage 2. The gas sampling device in this embodiment has a sampling and detection function, a self-cleaning function, and a filter element recovery function. These three functions correspond to three states of the switching component. When the gas sampling device is operating the sampling and detection function, the switching component is in the first state, such as... Figure 1As shown, at this time, the air intake passage 2 and the air outlet passage 3 are interconnected through the connecting passage 5. The main body 1 has an air extraction device 11, which draws gas from the air intake port 12 into the air intake passage 2, where it is detected by the detection element 4 on the air intake passage 2. The gas then enters the air outlet passage 3 through the connecting passage 5 and finally exits the main body 1 from the air outlet port 13. Dust and chemical pollutants carried in the gas to be detected will accumulate in the air intake passage 2 and the air outlet passage 3, affecting the detection accuracy of the detection element 4. Therefore, a self-cleaning function needs to be activated to clean the air intake passage 2 and the air outlet passage 3. When the self-cleaning function is running, the switching component is in the second state, such as... Figure 2 As shown, at this time, the intake passage 2 and the exhaust passage 3 are interconnected through the cleaning passage 6. The extraction device 11 can draw external gas from the exhaust port 13 into the exhaust passage 3. The gas enters the cleaning passage 6 along the exhaust passage 3, carrying dust and chemical pollutants from the exhaust passage 3 into the cleaning passage 6. The filter element 701 on the cleaning passage 6 can filter the dust and chemical pollutants in the gas. After passing through the filter element 701, the gas enters the intake passage 2 along the cleaning passage 6. When passing through the intake passage 2, it carries the dust and chemical pollutants from the intake passage 2 and discharges them through the intake port 12. After multiple self-cleaning cycles, the dust and chemical pollutants in the filter element 701 will gradually clog it. Therefore, the filter element recovery function needs to be activated. When the filter element recovery function is activated, the switching component is in the third state, such as... Figure 3 As shown, one end of the air outlet passage 3 is connected to one end of the cleaning passage 6, and the other end of the cleaning passage 6 is connected to one end of the sewage discharge passage 8. The other end of the sewage discharge passage 8 extends out of the main body 1. The air extraction device 11 can draw external gas into the air outlet passage 3 from the air outlet 13. The gas enters the cleaning passage 6 along the air outlet passage 3. The heating structure 702 can heat the filter element 701, causing the chemical pollutants attached to the filter element 701 to vaporize. The gas can carry the vaporized chemical pollutants into the sewage discharge passage 8 and discharge them out of the main body 1 through the other end of the sewage discharge passage 8, thereby completing the filter element recovery function.

[0051] Furthermore, the main body 1 contains a battery, which is electrically connected to the detection element 4, the switching assembly, the vacuum device 11, and the heating structure 702, respectively, to provide the power required for the operation of the detection element 4, the switching assembly, the vacuum device 11, and the heating structure 702.

[0052] Preferably, the detection element 4 is a gas detector and the heating structure 702 is an electric heating wire.

[0053] It should be noted that the test item 4 is to detect sulfur dioxide, hydrogen sulfide, nitric oxide, nitrogen dioxide, ammonia, carbon monoxide, chlorine, hydrogen fluoride, hydrogen chloride, hydrogen cyanide, ozone, methane, ethane, tetrahydrofuran, benzene, xylene, formaldehyde, acetaldehyde, acetone, sarin, mustard gas, and VEX, etc., with sulfur being the main chemical pollutant.

[0054] By switching different states using the switching components, the gas sampling device in this embodiment possesses sampling and detection functions, self-cleaning functions, and filter element recovery functions. This improves the automation level of the gas sampling device, reduces the need for manual intervention, and ensures the continuity and accuracy of gas monitoring, especially in emergency situations such as emergency rescue and toxic gas protection. It also avoids monitoring interruptions caused by filter element blockage, thereby improving sampling efficiency and safety.

[0055] In one embodiment, one end of the connecting passage 5 is connected to the air intake passage 2, and the switching component includes a first switching element 9 and a second switching element 10. The first switching element 9 is connected to the air outlet passage 3, and the air outlet passage 3 is adapted to be connected to the other end of the connecting passage 5 or one end of the cleaning passage 6 through the first switching element 9. The second switching element 10 is connected to the other end of the cleaning passage 6, and the other end of the cleaning passage 6 is adapted to be connected to the other end of the air intake passage 2 or the sewage discharge passage 8 through the second switching element 10.

[0056] In this embodiment, as Figures 1 to 3 As shown, the first switching element 9 connects the air outlet passage 3 to the air outlet of the connecting passage 5 or the air inlet of the cleaning passage 6, and the second switching element 10 connects the air outlet of the cleaning passage 6 to the air outlet of the inlet passage 2 or the air inlet of the drain passage 8. When the sampling and detection function is running, the first switching element 9 connects the air outlet passage 3 to the air outlet of the connecting passage 5, and the second switching element 10 connects the air outlet of the cleaning passage 6 to the air inlet of the drain passage 8; at this time, the switching component is in the first state. When the self-cleaning function is running, the first switching element 9 connects the air outlet passage 3 to the air inlet of the cleaning passage 6, and the second switching element 10 connects the air outlet of the cleaning passage 6 to the air outlet of the inlet of the inlet passage 2; at this time, the switching component is in the second state. When the filter element recovery function is running, the first switching element 9 connects the air outlet passage 3 to the air inlet of the cleaning passage 6, and the second switching element 10 connects the air outlet of the cleaning passage 6 to the air inlet of the drain passage 8; at this time, the switching component is in the third state.

[0057] Preferably, the first switching element 9 and the second switching element 10 are rotary valves.

[0058] In one embodiment, an air extraction device 11 is also included, which is respectively disposed in the connection passage 5 and the cleaning passage 6.

[0059] In this embodiment, as Figures 1 to 3As shown, the suction device 11 on the connecting passage 5 can be activated when the sampling and detection function is running, drawing gas from the inlet 12 into the inlet passage 2, and then along the connecting passage 5 and the first switching element 9 into the outlet passage 3, and finally exiting from the outlet 13. The suction device 11 on the cleaning passage 6 can be activated when the self-cleaning function and the filter element recovery function are running. When the self-cleaning function is running, the suction device 11 draws external gas from the outlet 13 into the outlet passage 3, and then along the first switching element 9, the cleaning passage 6, and the second switching element 10 into the inlet passage 2, and finally exiting from the inlet 12. When the filter element recovery function is running, the suction device 11 draws external gas from the outlet 13 into the outlet passage 3, and then along the first switching element 9, the cleaning passage 6, and the second switching element 10 into the drain passage 8, and finally exiting from the other end of the drain passage 8.

[0060] Preferably, the air extraction device 11 is an air pump.

[0061] In one embodiment, a control system is included, which is signal-connected to the switching component, the detection element 4, and the vacuum device 11, respectively.

[0062] In this embodiment, the control system (not shown) includes a mobile controller. The mobile controller has a central processing unit (CPU), a display screen, and a human-machine interface (HMI). The CPU receives gas analysis information transmitted from the detection unit 4, processes it, and transmits it to the display screen for display, allowing staff to obtain gas information at the accident site. Staff can use the mobile controller to select the function of the gas sampling device through the HMI. The CPU processes the corresponding control information to obtain control signals and sends these signals to the switching component, the extraction device 11, and the heating structure 702. This causes the switching component to switch between a first, second, or third state, and activates or deactivates the corresponding extraction device 11 and heating structure 702. The mobile controller can wirelessly communicate with the detection unit 4, the switching component, the extraction device 11, and the heating structure 702 via a communication protocol, or via a wired connection using a data cable. Through the mobile controller, staff can remotely monitor and control the operating status of the gas sampling device, further enhancing the convenience and flexibility of operation.

[0063] In one embodiment, the filter assembly 7 further includes a heat insulation layer 703 disposed on the outside of the filter element 701 and the heating structure 702, and the heat insulation layer 703 is adapted to accommodate the filter element 701 and the heating structure 702.

[0064] In this embodiment, as Figures 1 to 3As shown, the heat insulation layer 703 is sleeved on the outside of the filter element 701 and the heating structure 702. The heat insulation layer 703 is suitable for housing the filter element 701 and the heating structure 702. When the heating structure 702 heats the filter element 701, the heat insulation layer 703 can play a heat preservation role, prevent heat from escaping, avoid energy waste, and effectively reduce the heating time.

[0065] Preferably, the insulation layer 703 is a ceramic fiber product, such as ceramic cotton or aluminum silicate fiber. Ceramic fiber products are inorganic non-metallic materials that are resistant to high temperatures, have good insulation effects, and have high corrosion resistance.

[0066] In one embodiment, the main body 1 also has an air inlet 12 and an air outlet 13, and the air inlet 12 and the air outlet 13 each have a filter structure 14.

[0067] In this embodiment, the filter structure 14 is a micron-sized filter screen. The filter screen can filter out impurities and dust from entering the air intake passage 2 and the air outlet passage 3, preventing them from affecting the detection results. After prolonged use, a large amount of impurities and dust will accumulate on the filter screen at the air intake 12. When the self-cleaning function is activated, the gas in the air intake passage 2 will blow away the impurities and dust on the filter screen at the air intake 12, thereby completing the cleaning and ensuring that the filter screen at the air intake 12 is always unobstructed, thus ensuring the purity of the sampled gas.

[0068] In one embodiment, a rain shield 15 is also included. The rain shield 15 is disposed at the air inlet 12 and the air outlet 13. A ventilation channel 16 is constructed inside the rain shield 15. One end of the ventilation channel 16 is connected to the air inlet 12 or the air outlet 13, and the opening of the other end of the ventilation channel 16 faces the ground.

[0069] In this embodiment, as Figures 1 to 3 As shown, the main body 1 has two mounting holes (not shown), which form an air inlet 12 and an air outlet 13. The rainproof component 15 is fastened to the mounting holes. The ventilation channels 16 in the two rainproof components 15 are respectively connected to the air inlet passage 2 and the air outlet passage 3. One end of the ventilation channel 16 is connected to the air inlet 12 or the air outlet 13, and the opening of the other end of the ventilation channel 16 faces the ground, which can effectively prevent rainwater from entering the ventilation channel 16 and avoid rainwater from entering the air inlet passage 2 and the air outlet passage 3, thus affecting the detection results of the detection component 4.

[0070] In one embodiment, the rain shield 15 is detachably connected to the main body 1, and the rain shield 15 has a slot 17, through which the filter structure 14 is disposed in the ventilation channel 16.

[0071] In this embodiment, the rain shield 15 is fastened to the mounting hole by fasteners (not shown), and the rain shield 15 is detachably connected to the main body 1, facilitating the installation and removal of the rain shield 15. Simultaneously, the slot 17 design within the rain shield 15 ensures that the filter structure 14 is securely installed within the ventilation duct 16, preventing displacement or falling off during gas sampling. Furthermore, the slot 17 design facilitates the disassembly and cleaning of the filter structure 14. When the filter structure 14 becomes clogged or requires maintenance, personnel can easily remove the rain shield 15 for appropriate operations.

[0072] Preferably, the fastener is a fastening bolt.

[0073] Furthermore, a sealing plug (not shown) is snapped onto the other end of the ventilation duct 16. The sealing plug seals the ventilation duct 16, preventing dust and other impurities from entering the main body 1 when the gas sampling device is not in use. When the gas sampling device needs to be used, the operator only needs to pull the sealing plug out of the ventilation duct 16 to open the ventilation duct 16.

[0074] To more clearly describe the gas sampling device in this embodiment, a method of using the gas sampling device is provided below:

[0075] When using the gas sampling device in this embodiment, the operator first ensures that the sealing plug at the ventilation duct 16 has been removed, so that the ventilation duct 16 is in the open state. Then, the operator holds a mobile controller and selects the function of the gas sampling device through the human-machine interface. If the sampling and detection function is selected, the mobile controller sends corresponding control signals to the switching component and the extraction device 11. The switching component switches to the first state, connecting the inlet passage 2 and the outlet passage 3 through the connecting passage 5. The extraction device 11 starts, drawing in external gas from the ventilation duct 16 of the inlet 12, and then along the inlet passage 2, connecting passage 5, first switching component 9, and outlet passage 3, finally expelling it from the ventilation duct 16 of the outlet 13. During this process, the detection component 4 monitors the gas information in the inlet passage 2 in real time and transmits the detection information to the mobile controller for display, allowing the operator to obtain real-time gas monitoring data.

[0076] If the self-cleaning function is selected, the mobile controller sends corresponding control signals to the switching component and the extraction device 11. The switching component switches to the second state, connecting the air intake passage 2 and the air outlet passage 3 through the cleaning passage 6. The extraction device 11 starts, drawing in external air from the ventilation duct 16 of the air outlet 13, and then along the air outlet passage 3, the first switching component 9, the cleaning passage 6, the filter element 701, the second switching component 10, and the air intake passage 2, finally exiting from the ventilation duct 16 of the air inlet 12. During this process, the filter element 701 filters out dust and chemical pollutants in the air, achieving cleaning of the air intake passage 2 and the air outlet passage 3.

[0077] If the filter element recovery function is selected, the mobile controller sends corresponding control signals to the switching component, the suction device 11, and the heating structure 702. The switching component switches to the third state, connecting one end of the exhaust passage 3 to the cleaning passage 6, and the other end of the cleaning passage 6 to the sewage discharge passage 8. The suction device 11 is activated, drawing in external gas from the ventilation hole 16 of the exhaust port 13, and guiding it along the exhaust passage 3, the first switching component 9, the cleaning passage 6, the filter element 701, the heating structure 702, and the sewage discharge passage 8, finally discharging it from the other end of the sewage discharge passage 8. During this process, the heating structure 702 heats the filter element 701, causing the chemical pollutants attached to the filter element 701 to vaporize and be discharged with the gas, thereby restoring the filter element 701.

[0078] With the gas sampling device in this embodiment, staff can easily perform gas sampling and detection, self-cleaning, and filter element restoration functions without the need for frequent manual replacement of filter element 701. This greatly improves the continuity and accuracy of gas monitoring, especially in emergency situations such as emergency rescue and toxic gas protection, ensuring the timeliness and effectiveness of gas monitoring and providing strong support for rescue operations.

[0079] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A gas sampling device, characterized in that, include: The main body (1) has an air intake passage (2) and an air outlet passage (3) inside, and a detection element (4) is provided on the air intake passage (2); A connection path (5) is provided within the main body (1); A cleaning passage (6) is provided in the main body (1), and a filter assembly (7) is provided on the cleaning passage (6). The filter assembly (7) includes a filter element (701) and a heating structure (702). A sewage discharge passage (8) is provided inside the main body (1), and one end of the sewage discharge passage (8) extends out of the main body (1); A switching component is disposed within the main body (1). The switching component has three states. In the first state, the air intake passage (2) and the air outlet passage (3) are connected through the connecting passage (5). In the second state, the air intake passage (2) and the air outlet passage (3) are connected through the cleaning passage (6). In the third state, the air outlet passage (3) is connected to one end of the cleaning passage (6), and the other end of the cleaning passage (6) is connected to the sewage discharge passage (8).

2. The gas sampling device according to claim 1, characterized in that, One end of the connecting passage (5) is connected to the air intake passage (2). The switching component includes a first switching element (9) and a second switching element (10). The first switching element (9) is connected to the air outlet passage (3). The air outlet passage (3) is adapted to be connected to the other end of the connecting passage (5) or one end of the cleaning passage (6) through the first switching element (9). The second switching element (10) is connected to the other end of the cleaning passage (6). The other end of the cleaning passage (6) is adapted to be connected to the other end of the air intake passage (2) or the sewage discharge passage (8) through the second switching element (10).

3. The gas sampling device according to claim 2, characterized in that, The first switching element (9) and the second switching element (10) are rotary valves.

4. The gas sampling device according to any one of claims 1 to 3, characterized in that, It also includes an air extraction device (11), which is respectively disposed in the connection passage (5) and the cleaning passage (6).

5. The gas sampling device according to claim 4, characterized in that, The air extraction device (11) is an air pump.

6. The gas sampling device according to claim 4, characterized in that, It also includes a control system, which is signal-connected to the switching component, the detection element (4) and the air extraction device (11) respectively.

7. The gas sampling device according to claim 1, characterized in that, The filter assembly (7) further includes a heat insulation layer (703) disposed on the outside of the filter element (701) and the heating structure (702), and the heat insulation layer (703) is adapted to accommodate the filter element (701) and the heating structure (702).

8. The gas sampling device according to claim 1, characterized in that, The main body (1) also has an air inlet (12) and an air outlet (13), and the air inlet (12) and the air outlet (13) each have a filter structure (14).

9. The gas sampling device according to claim 8, characterized in that, It also includes a rain shield (15), which is disposed in the air inlet (12) and the air outlet (13). The rain shield (15) has a ventilation channel (16) inside. One end of the ventilation channel (16) is connected to the air inlet (12) or the air outlet (13), and the opening of the other end of the ventilation channel (16) faces the ground.

10. The gas sampling device according to claim 9, characterized in that, The rain shield (15) is detachably connected to the main body (1). The rain shield (15) has a slot (17). The filter structure (14) is disposed in the ventilation channel (16) through the slot (17).

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