Gas sampling device and method

Abstract

The present invention relates to the technical field of gas detection, and discloses a gas sampling device and method. The gas sampling device comprises a sampling head, a sampling tube and a fan. The gas sampling method comprises absorbing gas, adsorbing particles with larger particle sizes, and outputting gas. The present invention generates an airflow with a certain speed through the rotation of an internal fan, which causes the gas to flow from the sampling head to the sampling tube and rotate around the axis of the sampling tube. In combination with the structure inside the sampling head and the sampling tube, particles with a particle size larger than a preset value in the gas can be adsorbed on the inner wall of the gas sampling device, thereby removing particles with a particle size larger than the preset value in the gas, greatly reducing the influence of particles outside the particle size range to be detected in the gas on the detection process, and can effectively improve the accuracy of the detection result.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a gas sampling device and method. Background Art

[0002] In meteorological and environmental monitoring work, it is often necessary to detect particulate matter in ambient gas, especially to detect and analyze particulate matter of different particle size standards separately, which is of great significance. In existing gas sampling devices and methods, there is generally no structure or step for fine filtering and separation of particulate matter in the gas, resulting in a large number of particulate matter within various particle size standard ranges in the obtained gas samples, which seriously affects the accuracy of detecting particulate matter of specific particle size standards in the gas. Summary of the invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a gas sampling device and method, which can adsorb particles in the gas with a particle size larger than a preset value on the inner wall of the gas sampling device, thereby removing particles in the gas with a particle size larger than the preset value, making the detection of standard particles with specific particle sizes in the gas more accurate and the detection results more valuable as a reference for related analysis.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A gas sampling device, characterized in that it comprises: a sampling head, the sampling head comprises a sampling head air inlet and a sampling head air outlet; a sampling tube, the sampling tube is provided with a tubular cavity for gas to pass through, one end of the tubular cavity is connected to the sampling head air outlet, and the other end is connected to a gas detection device; a fan is arranged in the tubular cavity, and is used to generate an airflow of a certain speed, causing the gas to flow from the sampling head to the sampling tube and rotate around the axis of the sampling tube.

[0006] In the present invention, preferably, the gas sampling device also includes a large particle gas adsorption component, which is located between the sampling head and the sampling tube, and the large particle gas adsorption component includes an internal ventilation pipe and an adsorption chamber, and the internal ventilation pipe is connected to the gas outlet of the sampling head, and the internal ventilation pipe passes through the center of the adsorption chamber, and the adsorption chamber is connected to the sampling tube.

[0007] In the present invention, preferably, the gas sampling device also includes a drainage component, a liquid accumulation tube and a liquid accumulation bottle, the drainage component is provided with a gas supply hole for gas to pass through and a drainage hole for liquid to discharge from the gas sampling device, the gas supply hole is connected to the upper bottom surface and the lower bottom surface of the drainage component, the drainage hole is connected to the upper bottom surface and the side surface of the drainage component, and the drainage component is located between the large particle gas adsorption component and the sampling tube; one end of the liquid accumulation tube is connected to the drainage hole on the side of the drainage component, and the other end is connected to the liquid accumulation bottle.

[0008] In the present invention, preferably, the gas sampling device further comprises a heating component fixed on the sampling tube for heating the gas in the sampling tube.

[0009] In the present invention, preferably, the heating component is a heating strip.

[0010] In the present invention, preferably, the gas sampling device also includes a buffer component, and both ends of the buffer component are provided with a conical cavity with the tip pointing to the center of the buffer component, and the conical cavities at both ends are connected through the tubular cavity in the center of the buffer component, and the buffer component is located between the drainage component and the fan.

[0011] In the present invention, preferably, the sampling tube comprises: a fan cap, a sampling inner tube, a sampling outer tube, a gas supply connector and an inner and outer connecting component, wherein the fan cap is located on a side of the fan away from the sampling head, is connected to the gas outlet of the sampling head, is provided with a funnel-shaped cavity inside, the bottom of the funnel-shaped cavity is an internal connecting tube, and the fan is installed at the top position of the funnel-shaped cavity; one end of the sampling inner tube is fixedly connected and connected to the internal connecting tube, and the other end is connected to the inner and outer connecting components for conveying gas; the sampling outer tube is sleeved on the outside of the sampling inner tube, is fixedly connected to the outer wall of the fan cap, and is used to protect the sampling inner tube; a cavity for gas to pass through is provided inside the gas supply connector, which is fixed on the sampling outer tube and is used to be directly connected to the gas detection device; a cavity for gas to pass through is provided inside the inner and outer connecting components, one end of which is connected to the sampling inner tube, and the other end is connected to the gas supply connector, and the sampling inner tube is connected to the gas supply connector.

[0012] In the present invention, preferably, the sampling head includes: upper and lower draft plates, each of which has a funnel-shaped cavity inside, the top of the funnel-shaped cavity is set as the air inlet of the sampling head, and the bottom of the funnel-shaped cavity is set as the air outlet of the sampling head; a filter plate, covering the top of the funnel-shaped cavity of the upper and lower draft plates, and used for filtering the gas entering the upper and lower draft plates; a top cover, covering the filter plate, fixedly connected to the upper and lower draft plates, and having gaps at the edges of the upper and lower draft plates for gas to enter the upper and lower draft plates, so as to allow gas to enter the air inlet of the sampling head from the side.

[0013] The present invention also provides the following technical solutions:

[0014] A gas sampling method, characterized in that it includes: absorbing gas: absorbing gas into the gas sampling device by relying on the airflow generated by the gas sampling device; adsorbing particulate matter with larger particle size: placing gas in a cylindrical chamber, and inputting an airflow with a determined speed and rotating around the axis of the cylindrical chamber into the cylindrical chamber, so that particulate matter in the gas with a particle size larger than a preset value is adsorbed on the inner wall of the cylindrical chamber; outputting gas: outputting the gas to a gas detection device.

[0015] In the present invention, preferably, between the absorption gas and the output gas, it also includes: removing moisture: heating the gas to evaporate the moisture therein, condensing the water vapor at a specific position, and discharging the condensed liquid water out of the gas sampling device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the gas sampling device and method of the present invention generates an airflow with a certain speed through the rotation of the internal fan, causing the gas to flow from the sampling head to the sampling tube and rotate around the axis of the sampling tube. Combined with the structure inside the sampling head and the sampling tube, the particles in the gas with a particle size larger than a preset value can be adsorbed on the inner wall of the gas sampling device, thereby removing the particles in the gas with a particle size larger than the preset value, greatly reducing the influence of particles outside the particle size range that needs to be detected in the gas on the detection process, and can effectively improve the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the gas sampling device.

[0018] Figure 2 A cross-sectional view of the gas sampling device.

[0019] Figure 3 An exploded view of the gas sampling device.

[0020] Figure 4 This is a schematic diagram of the structure of the large particle gas adsorption component.

[0021] Figure 5 It is a schematic diagram of the structure of the drainage component.

[0022] Figure 6 A schematic diagram of the structure of the buffer component.

[0023] Figure 7 It is a schematic diagram of the structure of the fan cap.

[0024] Figure 8 It is a structural schematic diagram of the gas transmission joint.

[0025] Fig. 9It is a structural schematic diagram of internal and external connecting parts.

[0026] In the accompanying drawings: 1-sampling head, 2-sampling tube, 3-fan, 4-large particle gas adsorption component, 5-drainage component, 6-liquid accumulation tube, 7-liquid accumulation bottle, 8-heating component, 9-buffer component, 10-fan cap, 11-sampling inner tube, 12-sampling outer tube, 13-gas supply connector, 14-inner and outer connecting components, 15-upper and lower draft plates, 16-filter plate, 17-top cover, 18-internal ventilation pipe, 19-adsorption chamber, 20-gas supply hole, 21-drainage hole, 22-sampling head air inlet, 23-sampling head air outlet, 24-internal connecting tube. DETAILED DESCRIPTION

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

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] One embodiment of the present invention provides a gas sampling device, see Figure 1 and Figure 2 , including a sampling head 1, a sampling tube 2 and a fan 3. Among them, the sampling head air outlet 23 is fixedly connected to one end of the sampling tube 2, and the two are connected, and the other end of the sampling tube 2 is connected to the gas detection device, and the fan 3 fixed inside the sampling tube 2 can generate an airflow of a certain speed by rotating, so that the gas flows from the sampling head 1 to the sampling tube 2 and rotates around the axial direction of the sampling tube 2, and the speed of the airflow can be changed by adjusting the rotation speed of the fan 3.

[0031] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the sampling head 1 from the sampling head air inlet 22 and enters the sampling tube 2 through the sampling head air outlet 23. According to the cutting principle of the gas particle cutter, the particulate matter particles in the gas pass through the inner cavity structure at a certain speed. Due to the different volume sizes of the particles, the mass inertia is also different. When large particles pass through the tortuous inner cavity, they have a larger inertia and hit the interceptor and are adhered, while small particles pass smoothly. When the gas passes through the sampling head 1 and the sampling tube 2, the rotation of the fan 3 generates an airflow of a certain speed, in which the particles with a particle size greater than the preset value are adhered to the inner wall of the gas sampling device, and the particles with a particle size less than or equal to the preset value pass through the sampling tube 2. Finally, the gas enters the gas detection device through the sampling tube 2.

[0032] One embodiment of the present invention provides a gas sampling device, see Figures 1 to 4 , including a sampling head 1, a sampling tube 2, a fan 3 and a large particle gas adsorption component 4. The large particle gas adsorption component 4 is located between the sampling head 1 and the sampling tube 2, and includes an internal ventilation pipe 18 and an adsorption chamber 19. The internal ventilation pipe 18 is connected to the sampling head gas outlet 23, and the internal ventilation pipe 18 passes through the center of the adsorption chamber 19. One end of the sampling tube 2 is connected to the large particle gas adsorption component 4, and the two are connected, and the other end is connected to the gas detection device.

[0033] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the sampling head 1 from the sampling head air inlet 22 and enters the large particle gas adsorption component 4 through the sampling head air outlet 23. Due to the rotation of the airflow in the large particle gas adsorption component 4 and the large inner diameter of the large particle gas adsorption component 4, the large particles in the gas will hit the inner wall of the large particle gas adsorption component 4 due to the large inertia and adhere to it, and the small particles pass through the large particle gas adsorption component 4, thereby removing the large particles in the gas. Then, when the gas passes through the sampling tube 2, the rotation of the fan 3 generates an airflow of a certain speed, in which the particles with a particle size greater than the preset value adhere to the inner wall of the gas sampling device, and the particles with a particle size less than or equal to the preset value pass through the sampling tube 2, thereby cleaning the particles in the gas with a particle size greater than the preset value again. Finally, the gas enters the gas detection device through the sampling tube 2.

[0034] One embodiment of the present invention provides a gas sampling device, see Figures 1 to 5, including a sampling head 1, a sampling tube 2, a fan 3, a large particle gas adsorption component 4, a drainage component 5, a liquid collection tube 6 and a liquid collection bottle 7. The drainage component 5 is provided with a gas delivery hole 20 for gas to pass through and a drainage hole 21 for liquid to discharge from the gas sampling device. The gas delivery hole 20 is connected to the upper bottom surface and the lower bottom surface of the drainage component 5. The drainage hole 21 is connected to the upper bottom surface and the side surface of the drainage component 5. The drainage component 5 is located between the large particle gas adsorption component 4 and the sampling tube 2, and its upper bottom surface is connected to the large particle gas adsorption component 4, and its lower bottom surface is connected to the sampling tube 2. One end of the liquid collection tube 6 is connected to the drainage hole 21 on the side of the drainage component 5, and the other end is connected to the liquid collection bottle 7, so as to allow the liquid discharged from the drainage hole 21 to flow into the liquid collection bottle 7.

[0035] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the sampling head 1 from the sampling head air inlet 22 and enters the large-particle gas adsorption component 4 through the sampling head air outlet 23. Due to the rotation of the airflow in the large-particle gas adsorption component 4 and the large inner diameter of the large-particle gas adsorption component 4, the large particles in the gas will hit the inner wall of the large-particle gas adsorption component 4 due to its large inertia and adhere to it. Small particles pass through the large-particle gas adsorption component 4, thereby removing the large particles in the gas. At the same time, a part of the water vapor in the gas condenses on the inner wall of the large-particle gas adsorption component 4 and the upper bottom surface of the drainage component 5 to form liquid water. This part of the liquid water passes through the drainage hole 21 and the liquid collection tube 6 in turn and flows into the liquid collection bottle 7. Then, when the gas passes through the sampling tube 2, the rotation of the fan 3 generates an airflow of a certain speed, in which particles with a particle size larger than the preset value are adhered to the tube wall, and particles with a particle size smaller than or equal to the preset value pass through the sampling tube 2, thereby cleaning the particles in the gas with a particle size larger than the preset value again. Finally, the gas enters the gas detection device through the sampling tube 2.

[0036] One embodiment of the present invention provides a gas sampling device, see Figures 1 to 5 , including a sampling head 1, a sampling tube 2, a fan 3, a large particle gas adsorption component 4, a drainage component 5, a liquid collection tube 6, a liquid collection bottle 7 and a heating component 8. Among them, the drainage component 5 is provided with a gas transmission hole 20 for gas to pass through and a drainage hole 21 for liquid to discharge from the gas sampling device, the gas transmission hole 20 is connected to the upper bottom surface and the lower bottom surface of the drainage component 5, the drainage hole 21 is connected to the upper bottom surface and the side surface of the drainage component 5, the drainage component 5 is located between the large particle gas adsorption component 4 and the sampling tube 2, its upper bottom surface is connected to the large particle gas adsorption component 4, and its lower bottom surface is connected to the sampling tube 2. One end of the liquid collection tube 6 is connected to the drainage hole 21 on the side of the drainage component 5, and the other end is connected to the liquid collection bottle 7, so that the liquid discharged from the drainage hole 21 flows into the liquid collection bottle 7. The heating component is fixed on the sampling tube 2, and is used to heat the gas in the sampling tube 2.

[0037] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the sampling head 1 from the sampling head air inlet 22 and enters the large-particle gas adsorption component 4 through the sampling head air outlet 23. Due to the rotation of the airflow in the large-particle gas adsorption component 4 and the large inner diameter of the large-particle gas adsorption component 4, the large particles in the gas will hit the inner wall of the large-particle gas adsorption component 4 due to their large inertia and adhere to it, and the small particles pass through the large-particle gas adsorption component 4, thereby removing the large particles in the gas. At the same time, a part of the water vapor in the gas condenses on the inner wall of the large-particle gas adsorption component 4 and the upper bottom surface of the drainage component 5 to form liquid water. Since the heating component 8 heats the gas in the sampling tube 2, the moisture in the gas entering the sampling tube 2 will reduce the condensation in the sampling tube 2 due to the heat, and re-gather in the form of water vapor to the inner wall of the large particle gas adsorption component 4 and the upper bottom surface of the drainage component 5, condensing into liquid water, thereby further dehumidifying the gas entering the gas sampling device. The liquid water condensed on the inner wall of the large particle gas adsorption component 4 and the upper bottom surface of the drainage component 5 passes through the drainage hole 21 and the liquid accumulation tube 6 in turn, and flows into the liquid accumulation bottle 7. Then, when the gas passes through the sampling tube 2, the rotation of the fan 3 generates an airflow with a certain speed, in which the particles with a particle size greater than the preset value are adhered to the tube wall, and the particles with a particle size less than or equal to the preset value pass through the sampling tube 2, thereby cleaning the particles in the gas with a particle size greater than the preset value again. Finally, the gas enters the gas detection device through the sampling tube 2.

[0038] One embodiment of the present invention provides a gas sampling device, see Figures 1 to 5 , including a sampling head 1, a sampling tube 2, a fan 3, a large particle gas adsorption component 4, a liquid discharge component 5, a liquid collection tube 6, a liquid collection bottle 7 and a heating component 8. The heating component 8 is a heating strip, which is attached to the sampling tube 2 and is used to heat the gas in the sampling tube 2.

[0039] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the sampling head 1 from the sampling head air inlet 22 and enters the large particle gas adsorption component 4 through the sampling head air outlet 23. Due to the rotation of the airflow in the large particle gas adsorption component 4 and the large inner diameter of the large particle gas adsorption component 4, the large particles in the gas will hit the inner wall of the large particle gas adsorption component 4 due to the large inertia and adhere to it, and the small particles pass through the large particle gas adsorption component 4, thereby removing the large particles in the gas. At the same time, a part of the water vapor in the gas condenses on the inner wall of the large particle gas adsorption component 4 and the upper bottom surface of the drainage component 5 to form liquid water. The heating strip as the heating component 8 heats the gas in the sampling tube 2. The moisture in the gas entering the sampling tube 2 will reduce condensation in the sampling tube 2 due to the heat, and will be re-gathered in the form of water vapor to the inner wall of the large particle gas adsorption component 4 and the upper bottom surface of the drainage component 5, condensing into liquid water, thereby further dehumidifying the gas entering the gas sampling device. The liquid water condensed on the inner wall of the large particle gas adsorption component 4 and the upper bottom surface of the drainage component 5 passes through the drainage hole 21 and the liquid accumulation tube 6 in turn, and flows into the liquid accumulation bottle 7. Then, when the gas passes through the sampling tube 2, the rotation of the fan 3 generates an airflow with a certain speed, in which particles with a particle size greater than the preset value are adhered to the tube wall, and particles with a particle size less than or equal to the preset value pass through the sampling tube 2, thereby cleaning the particles in the gas with a particle size greater than the preset value again. Finally, the gas enters the gas detection device through the sampling tube 2.

[0040] One embodiment of the present invention provides a gas sampling device, see Figures 1 to 6 , including a sampling head 1, a sampling tube 2, a fan 3, a large particle gas adsorption component 4, a drainage component 5, a liquid collection tube 6, a liquid collection bottle 7 and a buffer component 9. The drainage component 5 is provided with a gas transmission hole 20 for gas to pass through and a drainage hole 21 for liquid to discharge from the gas sampling device. The gas transmission hole 20 is connected to the upper bottom surface and the lower bottom surface of the drainage component 5. The drainage hole 21 is connected to the upper bottom surface and the side surface of the drainage component 5. The drainage component 5 is located between the large particle gas adsorption component 4 and the sampling tube 2, and its upper bottom surface is connected to the large particle gas adsorption component 4, and its lower bottom surface is connected to the sampling tube 2. One end of the liquid collection tube 6 is connected to the drainage hole 21 on the side of the drainage component 5, and the other end is connected to the liquid collection bottle 7, so as to allow the liquid discharged from the drainage hole 21 to flow into the liquid collection bottle 7. Both ends of the buffer component 9 are provided with a conical cavity with the tip pointing to the center of the buffer component 9. The conical cavities at both ends are connected through the tubular cavity in the center of the buffer component 9. The buffer component 9 is located between the drainage component 5 and the fan 3, and plays a role in correcting the gas flow direction.

[0041] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the sampling head 1 from the sampling head air inlet 22 and enters the large-particle gas adsorption component 4 through the sampling head air outlet 23. Due to the rotation of the airflow in the large-particle gas adsorption component 4 and the large inner diameter of the large-particle gas adsorption component 4, the large particles in the gas will hit the inner wall of the large-particle gas adsorption component 4 due to its large inertia and adhere to it. Small particles pass through the large-particle gas adsorption component 4, thereby removing the large particles in the gas. At the same time, a part of the water vapor in the gas condenses on the inner wall of the large-particle gas adsorption component 4 and the upper bottom surface of the drainage component 5 to form liquid water. This part of the liquid water passes through the drainage hole 21 and the liquid accumulation tube 6 in sequence and flows into the liquid accumulation bottle 7. Then, the gas enters the conical cavity at the top of the buffer component 9 from the gas transmission hole 20, passes through the tubular cavity in the center and the conical cavity at the bottom, and enters the sampling tube 2. Since the gas delivery hole 20 may be set at a position deviated from the center of the drainage component 5, the flow direction of the gas when entering the sampling tube 2 is not necessarily perpendicular to the fan 3, which will cause the rotation direction of the airflow in the sampling tube 2 to tilt and deviate from the direction around the axial direction of the sampling tube, affecting the cleaning of the particles in the gas by the sampling tube 2. However, due to the correction of the buffer component 9, the gas can enter the sampling tube 2 from the center of the sampling tube 2 perpendicular to the fan 3, thereby ensuring that the rotation direction of the airflow in the sampling tube 2 is around the axial direction of the sampling tube 2. When passing through the sampling tube 2, the rotation of the fan 3 generates an airflow with a certain speed, in which particles with a particle size greater than the preset value are adhered to the tube wall, and particles with a particle size less than or equal to the preset value pass through the sampling tube 2, thereby cleaning the particles in the gas with a particle size greater than the preset value again. Finally, the gas enters the gas detection device through the sampling tube 2.

[0042] One embodiment of the present invention provides a gas sampling device, see Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Fig. 9, including a sampling head 1, a fan 3, a fan cap 10, a sampling inner tube 11, a sampling outer tube 12, a gas delivery connector 13 and an inner and outer connecting component 14. Among them, the fan 3 can generate an airflow of a certain speed by rotating, so that the gas flows from the sampling head 1 to the sampling inner tube 11 and rotates around the axial direction of the sampling inner tube 11, and the speed of the airflow can be changed by adjusting the rotation speed of the fan 3. A funnel-shaped cavity is provided inside one end of the fan cap 10, and the top of the funnel-shaped cavity is fixedly connected and communicated with the sampling head air outlet 23. The fan 3 is fixed at the connection between the fan cap 10 and the sampling head 1, and is installed at the top position of the funnel-shaped cavity. The bottom of the funnel-shaped cavity of the fan cap 10 is an internal connecting tube 24, one end of the sampling inner tube 11 is fixedly connected and communicated with the internal connecting tube 24, and the other end is connected with the gas detection device for conveying gas. The sampling outer tube 12 is sleeved on the outside of the sampling inner tube 11, and is fixedly connected to the outer wall of the fan cap 10, and is used to protect the sampling inner tube 11. The gas supply connector 13 has a cavity inside for gas to pass through, which is fixed on the sampling outer tube 12 and is used to directly connect with the gas detection device. The inner and outer connecting parts 14 have a cavity inside for gas to pass through, one end of which is connected to the sampling inner tube 11, and the other end is connected to the gas supply connector 13, so that the sampling inner tube 11 and the gas supply connector 13 are connected.

[0043] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling inner tube 11 and rotate around the axial direction of the sampling inner tube 11. The gas enters the sampling head 1 from the sampling head air inlet 22, and enters the fan cap 10 and the sampling inner tube 11 in turn through the sampling head air outlet 23. When the gas passes through the sampling head 1, the fan cap 10 and the sampling inner tube 11, the rotation of the fan 3 generates an airflow of a certain speed, in which particles with a particle size greater than a preset value are adhered to the inner walls of each part, and particles with a particle size less than or equal to the preset value pass through the sampling inner tube 11. Since the inner diameter of the sampling inner tube 11 is small, it is possible to clean particles with smaller particle sizes in the gas as needed. Finally, the gas enters the gas detection device from the sampling inner tube 11 through the internal and external connecting components 14 and the gas supply connector 13 in turn.

[0044] One embodiment of the present invention provides a gas sampling device, see Figures 1 to 3, including a sampling head 1, a sampling tube 2 and a fan 3. Among them, the sampling head air outlet 24 is fixedly connected to one end of the sampling tube 2, and the two are connected. The other end of the sampling tube 2 is connected to the gas detection device. The fan 3 fixed inside the sampling tube 2 can generate an airflow of a certain speed by rotating, so that the gas flows from the sampling head 1 to the sampling tube 2 and rotates around the axial direction of the sampling tube 2, and the speed of the airflow can be changed by adjusting the rotation speed of the fan 3. The sampling head 1 includes upper and lower draft plates 15, a filter plate 16 and a top cover 17. A funnel-shaped cavity is provided inside the upper and lower draft sheets 15, the top of the funnel-shaped cavity is set as the sampling head air inlet 22, and the bottom of the funnel-shaped cavity is set as the sampling head air outlet 23; the filter 16 covers the top of the funnel-shaped cavity of the upper and lower draft sheets 15, and is used to filter the gas entering the upper and lower draft sheets 15; the top cover 17 covers the filter 16, is fixedly connected to the upper and lower draft sheets 15, and has gaps at the edges of the upper and lower draft sheets 15 for gas to enter the upper and lower draft sheets 15, so that the gas enters the sampling head air inlet 22 from the side.

[0045] In this embodiment, when the gas sampling device is in operation, the rotation of the fan 3 generates an airflow of a certain speed, which causes the gas to flow from the sampling head 1 to the sampling tube 2 and rotate around the axial direction of the sampling tube 2. The gas enters the funnel-shaped cavity of the upper and lower draft plates 15 through the filter 16 from the gap between the top cover 17 and the upper and lower draft plates 15, and enters the sampling tube 2 from the bottom of the funnel-shaped cavity. In this way, the gas is filtered by the filter 16 before entering the upper and lower draft plates 15, and larger impurities in the gas can be intercepted outside the gas sampling device. When the gas passes through the sampling head 1 and the sampling tube 2, the rotation of the fan 3 generates an airflow of a certain speed, in which particles with a particle size greater than a preset value are adhered to the tube wall, and particles with a particle size less than or equal to the preset value pass through the sampling tube 2. Finally, the gas enters the gas detection device through the sampling tube 2.

[0046] One embodiment of the present invention provides a gas sampling method, see Figures 1 to 3 ,include:

[0047] Absorbing gas: The rotation of the fan 3 inside the gas sampling device generates an airflow with a certain speed, which makes the gas flow from the sampling head 1 to the sampling tube 2 and rotates around the axial direction of the sampling tube 2, and absorbs the gas from the sampling head air inlet 22 of the sampling head 1 into the gas sampling device;

[0048] Adsorption of particles with larger particle sizes: The gas enters the sampling tube 2 through the sampling head outlet 23. The inner cavity of the sampling tube 2 is cylindrical, and the rotation of the fan 3 generates an airflow with a certain speed rotating around the axis of the sampling tube 2 in the sampling tube 2, so that particles with a particle size larger than a preset value in the gas are adsorbed on the inner wall of the sampling tube 2;

[0049] Output gas: The gas is output from the sampling tube 2 to the gas detection device.

[0050] One embodiment of the present invention provides a gas sampling method, see Figures 1 to 5 ,include:

[0051] Absorbing gas: The rotation of the fan 3 inside the gas sampling device generates an airflow with a certain speed, which makes the gas flow from the sampling head 1 to the sampling tube 2 and rotates around the axial direction of the sampling tube 2, and absorbs the gas from the sampling head air inlet 22 of the sampling head 1 into the gas sampling device;

[0052] Adsorption of particles with larger particle sizes: The gas enters the sampling tube 2 through the sampling head outlet 23. The inner cavity of the sampling tube 2 is cylindrical, and the rotation of the fan 3 generates an airflow with a certain speed rotating around the axis of the sampling tube 2 in the sampling tube 2, so that particles with a particle size larger than a preset value in the gas are adsorbed on the inner wall of the sampling tube 2;

[0053] Removing moisture: The heating component 8 heats the gas at the sampling tube 2 to evaporate the moisture therein, and the water vapor condenses on the inner wall of the large particle gas adsorption component 4 and the upper bottom surface of the drainage component 5. The condensed liquid water is discharged from the gas sampling device through the drainage hole 21, the liquid collection tube 6, and the liquid collection bottle 7;

[0054] Output gas: The gas is output from the sampling tube 2 to the gas detection device.

[0055] In this embodiment, the water removal can also be carried out between the absorption gas and the adsorption of particles with larger particle sizes, which can also achieve the purpose of the present invention.

[0056] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A gas sampling device, characterized in that: include: A sampling head, the sampling head comprising a sampling head air inlet and a sampling head air outlet; A sampling tube, wherein a tubular cavity is provided inside the sampling tube for gas to pass through, one end of the tubular cavity is connected to the gas outlet of the sampling head, and the other end is connected to the gas detection device; A fan is disposed in the tubular cavity and is used to generate an airflow of a certain speed, causing the gas to flow from the sampling head to the sampling tube and rotate around the axial direction of the sampling tube; The gas sampling device further comprises a large particle gas adsorption component, which is located between the sampling head and the sampling tube, and the large particle gas adsorption component comprises an internal ventilation pipe and an adsorption chamber, wherein the internal ventilation pipe is connected to the gas outlet of the sampling head, the internal ventilation pipe passes through the center of the adsorption chamber, and the adsorption chamber is connected to the sampling tube; The sampling tube includes: a fan cap, an inner sampling tube, an outer sampling tube, a gas transmission joint and inner and outer connecting parts. The fan cap is located on a side of the fan away from the sampling head, is connected to the air outlet of the sampling head, and is provided with a funnel-shaped cavity inside, the bottom of the funnel-shaped cavity is an internal connecting pipe, and the fan is installed at the top of the funnel-shaped cavity; One end of the sampling inner tube is fixedly connected and communicated with the internal connecting tube, and the other end is communicated with the internal and external connecting components for conveying gas; The sampling outer tube is sleeved on the outside of the sampling inner tube and is fixedly connected to the outer wall of the fan cap to protect the sampling inner tube; The gas transmission connector is provided with a cavity for gas to pass through, fixed on the sampling outer tube, and used for direct communication with the gas detection device; The inner and outer connecting parts have a cavity for gas to pass through, one end of which is connected to the sampling inner tube, and the other end is connected to the gas supply connector, so that the sampling inner tube is connected to the gas supply connector; The sampling head comprises: The upper and lower draft plates have a funnel-shaped cavity inside, the top of the funnel-shaped cavity is set as the air inlet of the sampling head, and the bottom of the funnel-shaped cavity is set as the air outlet of the sampling head; A filter sheet, covering the top of the funnel-shaped cavity of the upper and lower draft sheets, and used for filtering the gas entering the upper and lower draft sheets; The top cover covers the filter and is fixedly connected to the upper and lower draft plates. A gap is left at the edge of the upper and lower draft plates for gas to enter the upper and lower draft plates, so as to allow gas to enter the air inlet of the sampling head from the side.

2. A gas sampling device according to claim 1, characterized in that: The gas sampling device also includes a liquid discharge component, a liquid collection tube and a liquid collection bottle. The liquid discharge component is provided with a gas delivery hole for gas to pass through and a liquid discharge hole for liquid to discharge from the gas sampling device, the gas delivery hole is connected to the upper bottom surface and the lower bottom surface of the liquid discharge component, the liquid discharge hole is connected to the upper bottom surface and the side surface of the liquid discharge component, and the liquid discharge component is located between the large particle gas adsorption component and the sampling tube; One end of the liquid collection tube is communicated with the liquid discharge hole at the side of the liquid discharge component, and the other end is communicated with the liquid collection bottle.

3. A gas sampling device according to claim 2, characterized in that: The gas sampling device also includes a heating component fixed on the sampling tube and used for heating the gas in the sampling tube.

4. A gas sampling device according to claim 3, characterized in that: The heating component is a heating strip.

5. A gas sampling device according to claim 2, characterized in that: The gas sampling device also includes a buffer component, both ends of which are provided with a conical cavity with the tip pointing to the center of the buffer component, and the conical cavities at both ends are connected through the tubular cavity in the center of the buffer component. The buffer component is located between the drainage component and the fan.

6. A gas sampling method according to any one of claims 1 to 5, characterized in that: include: Absorbing gas: absorbing gas into the gas sampling device by relying on the airflow generated by the gas sampling device; Adsorption of particles: placing gas in a cylindrical chamber, and inputting a flow of air with a certain speed rotating around the axis of the cylindrical chamber into the cylindrical chamber, so that particles in the gas with a particle size larger than a preset value are adsorbed on the inner wall of the cylindrical chamber; Output gas: Output gas to the gas detection device.

7. A gas sampling method according to claim 6, characterized in that: Also included between the absorption gas and the output gas: Removing moisture: heating the gas to evaporate the moisture therein, condensing the water vapor on the inner wall of the large particle gas adsorption component (4) and the upper bottom surface of the liquid discharge component (5), and discharging the condensed liquid water out of the gas sampling device.

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