High-precision air sampling equipment

Abstract

The invention belongs to the technical field of air sampling, and particularly relates to high-precision air sampling equipment which comprises a sampling pipe, a closable rainproof mechanism, a multi-channel manifold and a sampling controller, the upper end of the sampling pipe extends out of the roof; the closable rainproof mechanism is mounted at one end, extending out of the roof, of the sampling pipe, the closable rainproof mechanism comprises an annular base, the annular base is mounted on the side wall of the sampling pipe, a pair of first electric cylinders is symmetrically mounted on the annular base, the free ends of the first electric cylinders are connected with rainproof caps, and the rainproof caps correspond to ports of the sampling pipe; and an annular belt is connected between the annular base and the rainproof cap. When the device is not used, especially in a strong wind season, the port of the sampling pipe can be sealed, particulate matters or other suspended matters in external air are effectively prevented from entering the sampling pipe, then the clean effect of the inner wall of the sampling pipe can be ensured, the subsequent air quality detection cannot be influenced, and the detection precision is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air sampling, and in particular relates to a high-precision air sampling device. Background Art

[0002] Air quality testing refers to the process of quantitatively and qualitatively analyzing pollutants in the air through scientific methods and means to evaluate the air quality status. The objects of air quality testing include various pollutants such as particulate matter, sulfur dioxide, nitrogen oxides, ozone, volatile organic compounds, etc. By testing and analyzing these pollutants, we can understand the degree, source and changing trend of air pollution, and provide a scientific basis for formulating effective environmental protection policies.

[0003] The air sampling main pipe is a device used to collect samples from the ambient air. It is mainly used for environmental monitoring and pollution detection. It is usually composed of a sampling tube, a rain cap and an induced draft fan. When working, the induced draft fan is turned on to drive the air flow in the sampling tube, so that the outside air flows in from one end of the sampling tube and is introduced into the analysis instrument through the sampling port to measure the concentration of pollutants in the air. However, when the air sampling main pipe is not in use, the rain cap cannot fully seal the sampling tube port, especially in windy seasons, which causes particulate matter or other suspended matter in the outside air to easily enter the sampling tube through the rain cap and adhere to the inner wall of the sampling tube, which will affect the subsequent air quality detection and easily increase the detection error, thereby affecting the staff's judgment of the air quality test results.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a high-precision air sampling device.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a high-precision air sampling device, which can solve the problem that particles or suspended matter are easily introduced into the sampling tube when the air sampling main tube is not in use.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A high-precision air sampling device, comprising: a sampling tube, a closable rainproof mechanism, a multi-channel manifold and a sampling controller;

[0009] The upper end of the sampling tube extends out of the roof;

[0010] The closable rainproof mechanism is installed at the end of the sampling tube extending out of the roof, and the closable rainproof mechanism includes an annular base, which is installed on the side wall of the sampling tube, and a pair of first electric cylinders are symmetrically installed on the annular base, and the free ends of the first electric cylinders are connected to rainproof caps, and the rainproof caps correspond to the ports of the sampling tubes. An annular belt is connected between the annular base and the rainproof cap, and the annular belt is provided with a plurality of air holes evenly distributed around the circumference, and a rotating auxiliary mechanism is also installed on the rainproof cap;

[0011] The multi-channel manifold is connected to one end of the sampling tube away from the closable rainproof mechanism, and is connected to an air intake pipe, a plurality of mounting seats and a plurality of sampling seats. The air intake pipe, the mounting seats and the sampling seats are all in communication with the interior of the sampling tube. A fan is installed on the air intake pipe, and a first temperature and humidity sensor and a wind speed sensor are respectively installed on a pair of the mounting seats, an air quality analyzer is installed on one of the sampling seats, and a water storage bottle is connected to the bottom of the multi-channel manifold;

[0012] The sampling controller is installed on one side of the multi-channel manifold, and the fan, the first temperature and humidity sensor, the wind speed sensor and the air quality analyzer are all electrically connected to the sampling controller.

[0013] In one or more embodiments of the present invention, the sampling tube includes a sampling inner tube, and the sampling inner tube is used for the flow of air so as to sample the external air;

[0014] A heating layer is provided outside the sampling inner tube, and the heating layer is electrically connected to the sampling controller. The heating layer is used to heat the sampling inner tube to avoid condensation when air flows in the sampling inner tube, thereby ensuring the air sampling effect.

[0015] In one or more embodiments of the present invention, a stainless steel outer tube is provided outside the sampling inner tube to protect the sampling inner tube;

[0016] Insulation cotton is arranged between the sampling inner tube and the stainless steel outer tube, and the insulation cotton covers the heating layer to increase the insulation effect, so as to ensure the heating effect of the heating layer on the sampling inner tube.

[0017] In one or more embodiments of the present invention, a protective cover is provided on the outer side of the first electric cylinder, the protective cover is connected between the annular base and the rainproof cap, and the protective cover is used to protect the first electric cylinder;

[0018] The protective cover and the annular belt are both made of elastic rubber material. By setting the protective cover to be made of elastic rubber material, the protective cover can fully protect the first electric cylinder.

[0019] By using the elastic rubber material of the annular band, when the rain cap is away from the sampling tube port, the annular band is pulled and stretched, so that the overall aperture of the pore becomes larger. At this time, the outside air can enter the sampling inner tube through the pore; when the rain cap covers the sampling tube port, the annular band is not stretched. At this time, the aperture of the pore becomes smaller, and the outside air is not easy to pass through the pore.

[0020] In one or more embodiments of the present invention, an installation cavity is provided in the rain cap, and a control unit and a power supply are installed in the installation cavity. The first electric cylinder is electrically connected to the control unit and the power supply. The control unit is used to control the first electric cylinder, thereby realizing the movement of the rain cap. When the sampling tube is not in use as a whole, the rain cap can cover the port of the sampling tube to prevent particles or other suspended matter in the outside air from entering the sampling tube, thereby ensuring the cleanliness of the inner wall of the sampling tube, and will not affect subsequent air quality detection, thereby greatly improving the detection accuracy.

[0021] In one or more embodiments of the present invention, the rotary auxiliary mechanism includes a first rotating shaft, the first rotating shaft is rotatably connected to the rainproof cap, and one end of the first rotating shaft located in the sampling tube is connected to a blade. When air sampling is required, the fan is operated, and the fan forms a negative pressure inside the sampling inner tube through the suction pipe and the multi-channel manifold, so that the outside air can enter the sampling inner tube. When air flows in the sampling inner tube, the air will impact the blade, so that the blade drives the first rotating shaft to rotate;

[0022] The side wall of the first rotating shaft is fixedly connected with a boss and a support plate, and a sealing plate is slidably provided on the boss. The sealing plate is in contact with the support plate. When the rain cap covers the port of the sampling inner tube, the sealing plate can completely cover the port of the sampling inner tube, thereby increasing the overall sealing effect and preventing particulate matter or other suspended matter in the outside air from entering the sampling tube.

[0023] In one or more embodiments of the present invention, the sealing plate is provided with a plurality of through holes, which will not affect the entry of outside air into the sampling inner tube, so as to perform air sampling;

[0024] The bottom wall of the rain cap is provided with a receiving groove matching the sealing plate. When the sampling tube is not sampling air, the rain cap will cover the sampling inner tube port. At this time, the sealing plate will be in the receiving groove and can fully cover the sampling inner tube port, so as to improve the covering effect of the rain cap on the sampling inner tube port;

[0025] A pair of storage grooves are symmetrically provided on the side wall of the sealing plate, and an elastic rope is fixedly connected in the storage groove. One end of the elastic rope is connected to a hammer ball. When the first rotating shaft rotates, the first rotating shaft can drive the sealing plate to rotate synchronously through the convex column, so that the hammer ball in the storage groove is subjected to the rotating centrifugal force. Under the action of the rotating centrifugal force, the hammer ball will pull the elastic rope to extend, and make the hammer ball hammer the annular belt, so that the surface of the annular belt vibrates, thereby preventing the pores from being blocked by particulate matter, so as to ensure that air can pass through the pores normally.

[0026] In one or more embodiments of the present invention, one end of the first rotating shaft located in the installation cavity is fixedly connected to a linkage column, a second electric cylinder is installed in the linkage column, a free end of the second electric cylinder is connected to a limiting column, the second electric cylinder is wirelessly connected to the control unit, and the control unit can control the extension and retraction of the second electric cylinder through wireless signals.

[0027] In one or more embodiments of the present invention, a second rotating shaft is rotatably connected to the rain cap, and one end of the second rotating shaft located in the installation cavity is connected to a force-bearing column. The force-bearing column is provided with a locking groove matching the limit column, and when the second electric cylinder is extended, the second electric cylinder can drive the limit column to be inserted into the locking groove on the force-bearing column.

[0028] In one or more embodiments of the present invention, one end of the second rotating shaft located outside the rain cap is connected to a rotating plate, and bristles are installed on the rotating plate, and the bristles correspond to the rain cap. When the limiting column is inserted into the engaging groove, if the first rotating shaft rotates, the second rotating shaft can also rotate synchronously, so that the rotating plate can rotate. The rotating rotating plate can achieve a bird-repelling effect. At the same time, the bristles on the rotating rotating plate can be used to clean the upper surface of the rain cap to avoid excessive dust accumulation and increase the load on the rain cap.

[0029] Compared with the prior art, the high-precision air sampling equipment of the present invention can seal the port of the sampling tube when not in use, especially in windy seasons, effectively preventing particulate matter or other suspended matter in the outside air from entering the sampling tube, thereby ensuring the cleanliness of the inner wall of the sampling tube, and will not affect subsequent air quality detection, thereby greatly improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a three-dimensional diagram of a high-precision air sampling device in one embodiment of the present invention;

[0032] Figure 2 This is an installation effect diagram of a high-precision air sampling device in one embodiment of the present invention;

[0033] Figure 3 It is a cross-sectional view of a first state of a closable rainproof mechanism in one embodiment of the present invention;

[0034] Figure 4 for Figure 3 Schematic diagram of the structure at A in the middle;

[0035] Figure 5 for Figure 3 Schematic diagram of the structure at B in the middle;

[0036] Figure 6 for Figure 3 Schematic diagram of the structure at C in the middle;

[0037] Figure 7 for Figure 3 Schematic diagram of the structure at D in the middle;

[0038] Figure 8 It is a cross-sectional view of the second state of the closable rainproof mechanism in one embodiment of the present invention;

[0039] Fig. 9 for Figure 8 Schematic diagram of the structure at E in the middle;

[0040] Fig.10 for Figure 8 Schematic diagram of the structure at F in the middle;

[0041] Fig.11 It is a schematic diagram of a partial structure of a closable rainproof mechanism in one embodiment of the present invention;

[0042] Fig.12 for Fig.11 Schematic diagram of the structure at G in the middle.

[0043] Description of main reference numerals:

[0044] 1-sampling tube, 101-sampling inner tube, 102-heating layer, 103-stainless steel outer tube, 104-insulation cotton, 2-closeable rainproof mechanism, 201-annular base, 2011-groove, 2012-leakage hole, 202-first electric cylinder, 203-rainproof cap, 204-protective cover, 205-annular belt, 206-air hole, 207-installation cavity, 208-control unit, 209-first rotating shaft, 210-blade, 211-convex column, 212-support plate, 213-sealing plate, 214-through hole, 215-storage groove , 216-hammer ball, 217-linkage column, 218-second electric cylinder, 219-limit column, 220-second rotating shaft, 221-force column, 222-rotating plate, 223-annular groove, 224-annular tube, 225-nozzle, 226-suction pump, 227-heating box, 228-heating wire, 229-air pipe, 230-second temperature and humidity sensor, 3-multi-channel manifold, 301-suction pipe, 302-fan, 303-first temperature and humidity sensor, 304-wind speed sensor, 305-water bottle, 4-sampling controller. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0046] like Figures 1 to 12 As shown, a high-precision air sampling device in one embodiment of the present invention includes a sampling tube 1, a sealable rainproof mechanism 2, a multi-channel manifold 3 and a sampling controller 4.

[0047] The upper end of the sampling tube 1 extends out of the roof for air sampling. The sampling tube 1 includes a sampling inner tube 101, which is a borosilicate glass or Teflon-coated aluminum tube. The sampling inner tube 101 is used for air flow for air sampling.

[0048] Preferably, the total length of the sampling inner tube 101 is 3 m, wherein the length of the sampling inner tube 101 outside the roof is 1.5 m.

[0049] In addition, a heating layer 102 is provided outside the sampling inner tube 101, and the heating layer 102 is electrically connected to the sampling controller 4. The heating layer 102 is used to heat the sampling inner tube 101 to avoid condensation when the air flows in the sampling inner tube 101, thereby ensuring the air sampling effect.

[0050] Preferably, the heating layer 102 is a heating belt wrapped around the outside of the sampling inner tube 101, the power supply voltage of the heating belt is 12V, or the heating layer 102 is an electric heating conductive film covering the outside of the sampling inner tube 101, and the electric heating conductive film is an ITO conductive film, which is made of PET.

[0051] Specifically, a stainless steel outer tube 103 is disposed outside the sampling inner tube 101 , and the stainless steel outer tube 103 is connected to the multi-channel manifold 3 by bolts to protect the sampling inner tube 101 .

[0052] In addition, a heat-insulating cotton 104 is provided between the sampling inner tube 101 and the stainless steel outer tube 103 , and the heat-insulating cotton 104 covers the heating layer 102 to increase the heat-insulating effect, so as to ensure the heating effect of the heating layer 102 on the sampling inner tube 101 .

[0053] like Figures 1 to 12 As shown, the closable rainproof mechanism 2 is installed at the end of the sampling tube 1 extending out of the roof. When the air is not sampled, the closable rainproof mechanism 2 is used to block the port of the sampling inner tube 101, effectively preventing particles or other suspended matter in the outside air from entering the sampling inner tube 101, especially in windy seasons, thereby ensuring the cleanliness of the inner wall of the sampling inner tube 101, and will not affect the subsequent air quality detection, thereby greatly improving the detection accuracy.

[0054] The closable rainproof mechanism 2 includes an annular base 201, which is fixedly mounted on the side wall of the stainless steel outer tube 103. The annular base 201 is used to install a rainproof cap 203. A pair of first electric cylinders 202 are symmetrically mounted on the annular base 201. The free ends of the first electric cylinders 202 are connected to rainproof caps 203, which correspond to the ports of the sampling tube 1. When the first electric cylinders 202 are retracted, the rainproof caps 203 can block the ports of the sampling inner tube 101. Figure 8 When the first electric cylinder 202 is extended, the rain cap 203 is away from the sampling inner tube 101, so that the outside air can enter the sampling inner tube 101 to complete the air sampling. Figure 3 Status shown.

[0055] In addition, a groove 2011 is provided in the annular base 201 , and a plurality of leakage holes 2012 are provided at the bottom of the groove 2011 . The gas discharged from the nozzle 225 will be discharged through the leakage holes 2012 to avoid excessive pressure between the stainless steel outer tube 103 and the annular belt 205 .

[0056] Specifically, a protective cover 204 is provided on the outside of the first electric cylinder 202 . The protective cover 204 is connected between the annular base 201 and the rain cap 203 . The protective cover 204 is used to protect the first electric cylinder 202 .

[0057] like Figures 1 to 12As shown, an annular belt 205 is connected between the annular base 201 and the rain cap 203, and a plurality of air holes 206 evenly distributed around the circumference are provided on the annular belt 205. When the rain cap 203 blocks the port of the sampling inner tube 101, the annular belt 205 is in an unstretched state. At this time, the aperture of the air hole 206 is small, and it is not easy for the outside air to pass through the air hole 206. When the rain cap 203 is away from the sampling inner tube 101, the annular belt 205 is stretched, and the aperture of the air hole 206 becomes larger, and the outside air can quickly pass through the air hole 206, which will not affect the air sampling.

[0058] Preferably, the protective cover 204 and the annular belt 205 are both made of elastic rubber material. By making the protective cover 204 of elastic rubber material, the protective cover 204 can fully protect the first electric cylinder 202 .

[0059] By using the elastic rubber material of the annular belt 205, when the rain cap 203 is away from the end of the sampling inner tube 101, the annular belt 205 is pulled and stretched, so that the overall aperture of the air hole 206 becomes larger, and the outside air can enter the sampling inner tube 101 through the air hole 206. When the rain cap 203 covers the end of the sampling inner tube 101, the annular belt 205 is not stretched, and the aperture of the air hole 206 becomes smaller, and the outside air cannot easily pass through the air hole 206.

[0060] Among them, the rain cap 203 is provided with an installation cavity 207, and the installation cavity 207 is provided with a control unit 208 and a power supply, and the first electric cylinder 202 is electrically connected to the control unit 208 and the power supply. The control unit 208 is used to control the first electric cylinder 202, so as to realize the movement of the rain cap 203. That is, when it is not necessary to sample air, the first electric cylinder 202 shrinks, so that the rain cap 203 can cover the port of the sampling inner tube 101, so as to prevent particles or other suspended matter in the outside air from entering the sampling inner tube 101, thereby ensuring the clean effect of the inner wall of the sampling inner tube 101, and will not affect the subsequent air quality detection, thereby greatly improving the detection accuracy. When it is necessary to sample air, the first electric cylinder 202 extends, so that the rain cap 203 is away from the port of the sampling inner tube 101, so that the outside air can enter the sampling inner tube 101.

[0061] In addition, a wireless transmission module is provided on the control unit 208, and a wireless receiving module is provided in the sampling controller 4, and the wireless transmission module is connected to the wireless receiving module. The staff can control the control unit 208 through the sampling controller 4, thereby facilitating the operation.

[0062] like Figures 1 to 12 As shown, a rotating auxiliary mechanism is also installed on the rain cap 203, which is used to eliminate external interference, such as external particles, suspended matter or birds, so as to better perform air sampling and improve sampling accuracy, thereby ensuring the accuracy of subsequent air quality detection.

[0063] The rotary auxiliary mechanism includes a first rotating shaft 209, which is rotatably connected to the rain cap 203, and a blade 210 is connected to one end of the first rotating shaft 209 located in the sampling tube 1. When air sampling is required, the fan 302 is operated, and the fan 302 forms a negative pressure inside the sampling inner tube 101 through the suction pipe 301 and the multi-channel manifold 3, so that the outside air can enter the sampling inner tube 101. When the air flows in the sampling inner tube 101, the air will impact the blade 210, so that the blade 210 drives the first rotating shaft 209 to rotate.

[0064] In addition, the side wall of the first rotating shaft 209 is fixedly connected with a boss 211 and a support plate 212. The boss 211 is used to limit the sealing plate 213 so that the sealing plate 213 can rotate with the first rotating shaft 209. The support plate 212 is also used to limit the sealing plate 213. That is, when the rain cap 203 is away from the port of the sampling inner tube 101, the sealing plate 213 will slide down along the side wall of the first rotating shaft 209 under the action of gravity. The support plate 212 can limit the sliding distance of the sealing plate 213. The maximum sliding distance of the sealing plate 213 is Figure 3 Position shown.

[0065] Specifically, a sealing plate 213 is slidably disposed on the convex column 211, and the sealing plate 213 contacts the supporting plate 212. The diameter of the sealing plate 213 is larger than the diameter of the sampling tube 1. When the rain cap 203 covers the port of the sampling inner tube 101, the sealing plate 213 can also completely cover the port of the sampling inner tube 101. Figure 8 As shown, the overall sealing effect can be increased to prevent particles or other suspended matter in the outside air from entering the sampling inner tube 101, especially in windy seasons, thereby ensuring the cleanliness of the inner wall of the sampling inner tube 101, without affecting subsequent air quality detection, thereby greatly improving detection accuracy.

[0066] In addition, a plurality of through holes 214 are provided through the sealing plate 213 , which will not affect the outside air from entering the sampling inner tube 101 , thereby ensuring the air sampling effect.

[0067] Furthermore, the bottom wall of the rain cap 203 is provided with a receiving groove matching the sealing plate 213. When air sampling is not required, the sealing plate 213 will cover the port of the sampling inner tube 101 and will also be in the receiving groove, that is, Figure 8 As shown, the covering effect of the rainproof cap 203 on the port of the sampling inner tube 101 is improved.

[0068] like Figures 1 to 12 As shown, a pair of receiving grooves 215 are symmetrically provided on the side wall of the sealing plate 213 , and an elastic rope is fixedly connected in the receiving groove 215 , and a hammer ball 216 is connected to one end of the elastic rope.

[0069] When the first rotating shaft 209 rotates, the first rotating shaft 209 can drive the sealing plate 213 to rotate synchronously through the convex column 211, so that the hammer ball 216 in the storage groove 215 is subjected to the rotating centrifugal force. The hammer ball 216 will pull the elastic rope to extend under the action of the rotating centrifugal force, and make the hammer ball 216 hammer the annular belt 205, so that the surface of the annular belt 205 can vibrate, avoiding the air hole 206 from being blocked by particulate matter, so as to ensure that the air can pass through the air hole 206 normally and enter the sampling inner tube 101 to complete the air sampling.

[0070] Among them, one end of the first rotating shaft 209 located in the installation cavity 207 is fixedly connected to the linkage column 217, and the second electric cylinder 218 is installed in the linkage column 217. The free end of the second electric cylinder 218 is connected to the limit column 219, and the second electric cylinder 218 is wirelessly connected to the control unit 208. The control unit 208 can control the second electric cylinder 218 to extend and retract through wireless signals.

[0071] In addition, the rain cap 203 is rotatably connected with a second rotating shaft 220, and one end of the second rotating shaft 220 located in the installation cavity 207 is connected with a force-bearing column 221, and the force-bearing column 221 is provided with a clamping groove matching the limit column 219. When the second electric cylinder 218 is extended, the second electric cylinder 218 can drive the limit column 219 to be inserted into the clamping groove on the force-bearing column 221, thereby realizing the linkage between the first rotating shaft 209 and the second rotating shaft 220, that is, when the first rotating shaft 209 rotates, the second rotating shaft 220 will also rotate synchronously.

[0072] Specifically, one end of the second rotating shaft 220 located outside the rain cap 203 is connected to a rotating plate 222, on which bristles are installed, and the bristles correspond to the rain cap 203. When the limiting column 219 is inserted into the engaging groove, if the first rotating shaft 209 rotates, the second rotating shaft 220 can also rotate synchronously, thereby enabling the rotating plate 222 to rotate. The rotating rotating plate 222 can achieve a bird-repelling effect to prevent birds from interfering with air sampling. At the same time, the bristles on the rotating plate 222 can be used to clean the upper surface of the rain cap 203 to prevent excessive accumulation of dust and increase the load of the rain cap 203.

[0073] like Figures 1 to 12 As shown, a side of the rain cap 203 close to the sampling tube 1 is provided with an annular groove 223, the diameter of which is larger than the diameter of the sealing plate 213 and smaller than the diameter of the annular belt 205. The annular groove 223 is used to accommodate the annular tube 224.

[0074] Among them, an annular tube 224 is installed in the annular groove 223, and a plurality of nozzles 225 evenly distributed around the circumference are connected to the annular tube 224. The gas in the annular tube 224 can be discharged through the plurality of nozzles 225. When the nozzles 225 discharge the gas, the gas capacity between the stainless steel outer tube 103 and the annular belt 205 can be increased. The annular belt 205 will expand to a certain extent under the action of the gas, thereby slightly increasing the aperture of the pores 206. At this time, part of the gas between the stainless steel outer tube 103 and the annular belt 205 will be discharged through the pores 206, which is used to blow out the particles that may enter the pores 206 in the reverse direction, so as to avoid the pores 206 from being blocked and ensure the flow effect of the subsequent gas.

[0075] In addition, an air suction pump 226 is installed in the installation cavity 207, and the air outlet of the air suction pump 226 is connected to a heating box 227, and a heating wire 228 is installed in the heating box 227, and the heating temperature range of the heating wire 228 is 30-50° C. The air suction pump 226 absorbs external air through the air suction hole, and when the external air flows in the heating box 227, it will be heated by the heating wire 228 to increase the gas temperature.

[0076] Specifically, a gas pipe 229 is connected between the heating box 227 and the annular tube 224, and the gas in the heating box 227 enters the annular tube 224 through the gas pipe 229, and is then discharged through a plurality of nozzles 225. The gas discharged through the nozzles 225 can increase the gas capacity between the stainless steel outer tube 103 and the annular belt 205. The annular belt 205 will expand to a certain extent under the action of the gas, thereby slightly increasing the aperture of the pores 206. At this time, part of the gas between the stainless steel outer tube 103 and the annular belt 205 will be discharged through the pores 206, which is used to blow out the particles that may enter the pores 206, avoid the pores 206 from being blocked, and ensure the flow effect of the subsequent gas.

[0077] If air sampling is performed in winter, the heating wire 228 can be operated to instantly heat the gas in the heating box 227 to increase the gas temperature. When the nozzle 225 discharges hot air, the hot air can be used to preheat the annular belt 205 and the port of the sampling tube 1. On the one hand, the annular belt 205 can be prevented from being pulled and broken due to overcooling. On the other hand, the heating time of the heating layer 102 on the port of the sampling inner tube 101 can be shortened to prevent condensation of air at the port of the sampling inner tube 101 and affect air sampling.

[0078] In addition, an air suction hole is provided at the bottom of the rain cap 203 , and the installation cavity 207 is connected to the outside through the air suction hole, so that the air suction pump 226 can absorb external gas to transport the gas to between the stainless steel outer tube 103 and the annular belt 205 .

[0079] Furthermore, a second temperature and humidity sensor 230 is installed on the bottom surface of the rain cap 203, and the second temperature and humidity sensor 230 is arranged between the annular tube 224 and the sealing plate 213. The air pump 226 and the second temperature and humidity sensor 230 are both electrically connected to the control unit 208. The second temperature and humidity sensor 230 is used to detect the temperature and humidity of the air at the port of the sampling inner tube 101.

[0080] like Figures 1 to 12 As shown, the multi-channel manifold 3 is connected to one end of the sampling tube 1 away from the closable rainproof mechanism 2 , and the multi-channel manifold 3 is used to connect a fan 302 , a first temperature and humidity sensor 303 , and a wind speed sensor 304 .

[0081] Among them, the multi-channel manifold 3 is connected to an intake pipe 301, a plurality of mounting seats and a plurality of sampling seats. The intake pipe 301, the mounting seats and the sampling seats are all connected to the interior of the sampling tube 1. A fan 302 is installed on the intake pipe 301. When the fan 302 is running, the fan 302 can form a negative pressure in the multi-channel manifold 3 and the sampling inner tube 101 through the intake pipe 301, so that the outside air can enter the sampling inner tube 101 for sampling.

[0082] In addition, a first temperature and humidity sensor 303 and a wind speed sensor 304 are respectively installed on one pair of mounting bases. The first temperature and humidity sensor 303 is used to detect the air temperature and humidity in the sampling inner tube 101, and the wind speed sensor 304 is used to detect the air flow rate in the sampling inner tube 101, so as to perform air sampling. The first temperature and humidity sensor 303 and the wind speed sensor 304 are both threadedly connected to avoid air leakage.

[0083] Specifically, an air quality analyzer is installed on one of the sampling seats, and the air quality can be analyzed by using the air quality analyzer. A water storage bottle 305 is connected to the bottom of the multi-channel manifold 3 to collect the liquid in the sampling inner tube 101.

[0084] Preferably, the multi-channel manifold 3 is a cube and made of polytetrafluoroethylene. The sampling inner tube 101 is plugged into the multi-channel manifold 3, and the connection between the sampling inner tube 101 and the multi-channel manifold 3 is sealed with a rubber ring.

[0085] like Figures 1 to 12 As shown, the sampling controller 4 is installed on one side of the multi-channel manifold 3 , and the fan 302 , the first temperature and humidity sensor 303 , the wind speed sensor 304 and the air quality analyzer are all electrically connected to the sampling controller 4 .

[0086] The sampling controller 4 can dynamically control the heating temperature of the heating layer 102, that is, the heating temperature of the heating layer 102 can be controlled within the range of 30-50° C. The sampling controller 4 can also collect the temperature, humidity and wind speed in the sampling inner tube 101 through the first temperature and humidity sensor 303 and the wind speed sensor 304 to control the power of the fan 302.

[0087] In addition, the sampling controller 4 is provided with a display screen, through which parameters such as the temperature, humidity and wind speed of the air in the sampling inner tube 101 can be directly read.

[0088] In specific use, when air sampling is not needed, the first electric cylinder 202 is controlled to retract, and the first electric cylinder 202 makes the rain cap 203 approach and cover the port of the sampling inner tube 101. At the same time, since the diameter of the sealing plate 213 is larger than the diameter of the sampling tube 1, the sealing plate 213 will be fixed between the rain cap 203 and the port of the sampling tube 1, that is, the sealing plate 213 can also completely cover the port of the sampling inner tube 101, that is, Figure 8 The state shown can further increase the sealing effect of the port of the sampling inner tube 101, thereby preventing particulate matter or other suspended matter in the outside air from entering the sampling inner tube 101, especially in windy seasons, thereby ensuring the cleanliness of the inner wall of the sampling inner tube 101, and will not affect subsequent air quality detection, thereby greatly improving the detection accuracy.

[0089] As the first electric cylinder 202 contracts, the annular belt 205 is not pulled, the aperture of the air hole 206 is relatively small, and the outside air is not easy to pass through the air hole 206, so as to achieve the re-blocking of the port of the sampling inner tube 101.

[0090] When air sampling is required, the suction pump 226 is controlled to operate first, and the suction pump 226 absorbs external gas through the suction hole. The external gas enters the annular tube 224 through the heating box 227 and the gas pipe 229, and then is discharged through a plurality of nozzles 225. The gas discharged by the nozzle 225 can increase the gas capacity between the stainless steel outer tube 103 and the annular belt 205. The annular belt 205 will expand to a certain extent under the action of the gas, thereby slightly increasing the aperture of the pore 206. At this time, part of the gas between the stainless steel outer tube 103 and the annular belt 205 will be discharged through the pore 206 to blow out the particles that may enter the pore 206, which can not only prevent the pore 206 from being blocked and ensure the subsequent gas flow effect, but also prevent the particles in the pore 206 from directly entering the sampling inner tube 101 during the subsequent air sampling, thereby causing a large error in air detection.

[0091] If air sampling is performed in winter, the heating wire 228 can also be operated to instantly heat the gas flowing in the heating box 227 by using the heating wire 228 to increase the gas temperature. When the nozzle 225 discharges hot air, the hot air can be used to preheat the annular belt 205 and the port of the sampling tube 1. On the one hand, the annular belt 205 can be prevented from being pulled and broken due to overcooling. On the other hand, the heating time of the heating layer 102 on the port of the sampling inner tube 101 can be shortened to prevent condensation of air at the port of the sampling inner tube 101 and affect air sampling.

[0092] The suction pump 226 stops running after running for 3 minutes, controls the first electric cylinder 202 to extend, and the first electric cylinder 202 drives the rain cap 203 away from the end of the sampling inner tube 101. The annular belt 205 is pulled, and the aperture of the air hole 206 becomes larger. At the same time, the sealing plate 213 slides down from the storage groove along the side wall of the first rotating shaft 209 under the action of gravity until the sealing plate 213 contacts the support plate 212, that is, Figure 3 Status shown.

[0093] The heating layer 102 and the fan 302 are operated. The heating layer 102 is used to heat the sampling inner tube 101 to prevent condensation when the air flows in the sampling inner tube 101. When the fan 302 is in operation, a negative pressure is formed in the sampling inner tube 101 through the air intake pipe 301 and the multi-channel manifold 3. Under the action of the negative pressure, the outside air can enter the sampling inner tube 101 through the air hole 206 to flow to complete the sampling. When the air passes through the second temperature and humidity sensor 230, the second temperature and humidity sensor 230 can detect the temperature and humidity of the air at the port of the sampling inner tube 101, and the air quality can be analyzed using the air quality analyzer installed on the multi-channel manifold 3.

[0094] In addition, when air flows in the sampling inner tube 101, the air will impact the blade 210, causing the blade 210 to drive the first rotating shaft 209 to rotate. The first rotating shaft 209 can drive the sealing plate 213 to rotate synchronously through the boss 211, thereby causing the hammer ball 216 in the storage groove 215 to be subjected to the rotating centrifugal force. Under the action of the rotating centrifugal force, the hammer ball 216 will pull the elastic rope to extend, and cause the hammer ball 216 to hammer the annular belt 205, so that the surface of the annular belt 205 can vibrate, preventing the air hole 206 from being blocked by particulate matter during the air sampling process, so as to ensure that the air can pass through the air hole 206 normally and enter the sampling inner tube 101 to complete the air sampling.

[0095] During the air sampling process, the second electric cylinder 218 can also be controlled to extend, and the second electric cylinder 218 can drive the limit column 219 to be inserted into the engaging groove on the force-bearing column 221, thereby realizing the linkage between the first rotating shaft 209 and the second rotating shaft 220, that is, when the first rotating shaft 209 rotates, the second rotating shaft 220 will also rotate synchronously. When the second rotating shaft 220 rotates, the second rotating shaft 220 can drive the rotating plate 222 to rotate, and the rotating rotating plate 222 can achieve the effect of driving away birds and prevent birds from interfering with air sampling. At the same time, the bristles on the rotating plate 222 can be used to clean the upper surface of the rain cap 203 to prevent excessive accumulation of dust and increase the load of the rain cap 203.

[0096] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0097] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-precision air sampling device, characterized in that: include: A sampling tube, the upper end of which extends out of the roof; A closable rainproof mechanism is installed at one end of the sampling tube extending out of the roof, the closable rainproof mechanism comprises an annular base, the annular base is installed on the side wall of the sampling tube, a pair of first electric cylinders are symmetrically installed on the annular base, the free ends of the first electric cylinders are connected to rainproof caps, the rainproof caps correspond to the ports of the sampling tubes, an annular belt is connected between the annular base and the rainproof cap, a plurality of circumferentially evenly distributed air holes are provided on the annular belt, and a rotating auxiliary mechanism is also installed on the rainproof cap; A multi-channel manifold is connected to one end of the sampling tube away from the closable rainproof mechanism, an air intake pipe, a plurality of mounting seats and a plurality of sampling seats are connected to the multi-channel manifold, the air intake pipe, the mounting seat and the sampling seat are all connected to the inside of the sampling tube, a fan is installed on the air intake pipe, a first temperature and humidity sensor and a wind speed sensor are respectively installed on a pair of the mounting seats, an air quality analyzer is installed on one of the sampling seats, and a water storage bottle is connected to the bottom of the multi-channel manifold; The sampling controller is installed on one side of the multi-channel manifold, and the fan, the first temperature and humidity sensor, the wind speed sensor and the air quality analyzer are all electrically connected to the sampling controller.

2. A high-precision air sampling device according to claim 1, characterized in that: The sampling tube comprises a sampling inner tube, a heating layer is arranged outside the sampling inner tube, and the heating layer is electrically connected to the sampling controller.

3. A high-precision air sampling device according to claim 2, characterized in that: A stainless steel outer tube is arranged outside the sampling inner tube, and heat-insulating cotton is arranged between the sampling inner tube and the stainless steel outer tube, and the heat-insulating cotton covers the heating layer.

4. A high-precision air sampling device according to claim 1, characterized in that: A protective cover is provided on the outer side of the first electric cylinder, and the protective cover is connected between the annular base and the rainproof cap. Both the protective cover and the annular belt are made of elastic rubber.

5. A high-precision air sampling device according to claim 1, characterized in that: An installation cavity is provided in the rainproof cap, a control unit and a power supply are installed in the installation cavity, and the first electric cylinder is electrically connected to the control unit and the power supply.

6. A high-precision air sampling device according to claim 5, characterized in that: The rotary auxiliary mechanism includes a first rotating shaft, which is rotatably connected to the rainproof cap, and one end of the first rotating shaft located in the sampling tube is connected to a blade, and the side wall of the first rotating shaft is fixedly connected to a boss and a support plate, and a sealing plate is slidably provided on the boss, and the sealing plate is in contact with the support plate.

7. A high-precision air sampling device according to claim 6, characterized in that: The sealing plate is provided with a plurality of through holes, the bottom wall of the rain cap is provided with a storage groove matching the sealing plate, the side wall of the sealing plate is symmetrically provided with a pair of storage grooves, an elastic rope is fixedly connected in the storage groove, and one end of the elastic rope is connected to a hammer ball.

8. A high-precision air sampling device according to claim 7, characterized in that: One end of the first rotating shaft located in the installation cavity is fixedly connected to a linkage column, a second electric cylinder is installed in the linkage column, a free end of the second electric cylinder is connected to a limiting column, and the second electric cylinder is wirelessly connected to the control unit.

9. A high-precision air sampling device according to claim 8, characterized in that: The rainproof cap is rotatably connected with a second rotating shaft, one end of the second rotating shaft located in the installation cavity is connected with a force-bearing column, and the force-bearing column is provided with a clamping groove matching the limiting column.

10. A high-precision air sampling device according to claim 9, characterized in that: One end of the second rotating shaft located outside the rainproof cap is connected with a rotating plate, and bristles are installed on the rotating plate, and the bristles correspond to the rainproof cap.

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