A multi-channel atmospheric pollutant sampling device

Abstract

The present invention belongs to the field of atmospheric sampling technology, and in particular relates to a multi-channel atmospheric pollutant sampling device. In view of the problem that the existing device adopts a split sampling structure, resulting in low sampling efficiency and lacks control of the constant temperature value during constant temperature adjustment, which leads to the problem that it cannot be well applied to sampling in environments with large temperature differences, the following scheme is proposed, including an integrated constant temperature control tube, an integrated airflow stabilizing tube, and an integrated sampling bottle. The present invention creatively maximizes heat utilization to achieve temperature regulation while also controlling the temperature value. It creatively adopts the integrated airflow stabilizing tube to coordinate the noise reduction and flow equalization measures, thereby ensuring that the constant temperature and constant flow atmosphere is stably delivered to the integrated sampling bottle; it can not only greatly improve the sampling efficiency, but also reduce the variable factors of each sample collected by each group of sampling bottles, so that more accurate analysis conclusions can be obtained in the later analysis and processing stage.

Description

Technical Field

[0001] The present invention relates to a sampling device, in particular to a multi-channel atmospheric pollutant sampling device, belonging to the technical field of atmospheric sampling. Background Art

[0002] Atmospheric particulate matter (PM2.5, PM10, and ultrafine particles) is a core indicator of air pollution. Its complex composition, including heavy metals, organic carbon, sulfates, and nitrates, poses significant risks to human health and the ecological environment. Accurately collecting particulate matter samples is fundamental to studying its sources, chemical composition, and toxicological effects. It also provides a key technical support for the implementation of ambient air quality standards (such as China's "Ambient Air Quality Standard" GB 3095-2012 and the US EPA standard). Currently, mainstream atmospheric particulate matter sampling devices are based on the following technical principles: membrane capture, which uses a pump to draw air and deposit particles on the surface of a filter membrane (such as quartz or Teflon); inertial impactor classification, which uses a multi-stage impactor plate to classify particles by size (such as a PM2.5 / PM10 cutter); and electrostatic deposition, which uses a high-voltage electric field to deposit charged particles on a collector plate.

[0003] For the existing atmospheric sampling related equipment, such as a constant temperature and constant flow atmospheric sampling device disclosed in announcement number CN116539380A, it includes a collection box and an air path collection mechanism arranged on the collection box, a constant temperature control unit and a gas flow control unit are arranged in the collection box, the air path collection mechanism includes an air inlet, a porous sieve plate absorption bottle, an electromagnetic valve, a flow sensor, an output air pump and an exhaust port connected in sequence, a lower porous plate and an upper porous plate are arranged transversely in the porous sieve plate absorption bottle, a first through hole for the sampling gas to pass through is provided on the lower porous plate, and a second through hole for the sampling gas to pass through is provided on the upper porous plate, at least one of the lower porous plate and the upper porous plate can be driven so that the first through hole and the second through hole are combined to form an aperture of different sizes. The same gas delivery channel can adjust the size of the gas delivery channel so that the sampled gas is dispersed to form bubbles of appropriate size, increasing the contact area and contact time between the sampled gas and the absorption liquid. However, the sampling method adopted by the sampling device is a single absorption liquid collection, and the sampling method is relatively single. Although it can achieve constant temperature and constant flow control of the atmospheric airflow, when performing constant temperature control, the specific structure of how to control the temperature of the atmospheric airflow is not disclosed. A constant temperature and constant flow atmospheric sampling device disclosed in announcement number CN118980552A includes a main frame, and an airflow detection control component is provided on the upper side of the main frame. The airflow detection control component is used to detect the airflow velocity and airflow temperature. The airflow detection control component is used to To control the air flow temperature, an electric heating wire is used to control the temperature of the atmospheric air flow. Although this method can realize temperature regulation in conjunction with a temperature sensor, the regulation method is to maintain the air flow temperature at a constant temperature state at the same level as the surrounding environment temperature for sampling, that is, the air flow temperature can only be increased for constant temperature regulation when the air flow temperature is low. However, for the northern region, which is mainly in an environment with a large temperature difference between day and night, even if the existing device can maintain the air flow at a constant temperature, it uses a temperature increase method for constant temperature regulation. However, when the external environment is at a high temperature, the constant temperature value that can be adjusted is also a high temperature. The high temperature will lead to reduced sampling accuracy and sampling efficiency, and the atmospheric air entering the ventilation pipe When maintaining a constant temperature at a higher temperature, the Reynolds number will be large, which will not promote the formation of laminar flow, and will lead to uneven flow velocity distribution, which is not conducive to the collection of atmospheric particulate matter and various pollutants in the atmosphere. In addition, during the temperature control process, the existing control method cannot maximize the utilization of heat, resulting in a certain amount of energy loss. In addition, when sampling, the existing device adopts a split sampling structure, that is, it can only perform particulate matter sampling, adsorption sampling or absorption sampling separately. Not only can the sampling efficiency not be improved, but the variable factors of each sample collected by each group of sampling bottles will be increased, and thus in the later analysis and processing stage, more accurate analysis conclusions cannot be obtained. Based on this, the present application proposes a multi-channel atmospheric pollutant sampling device. Summary of the Invention

[0004] The present invention provides a multi-channel atmospheric pollutant sampling device to solve the problems that the existing device adopts a split sampling structure, resulting in low sampling efficiency and lacks control of the constant temperature value during constant temperature adjustment, which makes it unable to be well applied for sampling in environments with large temperature differences.

[0005] The present invention achieves the above-mentioned object through the following technical solutions: a multi-channel atmospheric pollutant sampling device, comprising a sampling box, the sampling box comprising a box shell and a multi-channel sampling assembly disposed within the box shell, the inlet and outlet ports of the multi-channel sampling assembly being both located outside the box shell; the multi-channel sampling assembly comprising a plurality of sampling channels and a plurality of integrated sampling bottles, each sampling channel being connected to an integrated constant temperature control tube and an integrated airflow stabilizing tube;

[0006] The integrated constant temperature control tube includes an airflow cooling tube, an airflow preheating tube and a constant temperature heating tube, which are sequentially arranged from the inside out. A cooling channel is formed inside the airflow cooling tube, a preheating channel is formed in the gap between the airflow cooling tube and the airflow preheating tube, and a heating channel is formed in the gap between the airflow preheating tube and the constant temperature heating tube. The integrated airflow stabilizing tube includes a large-diameter diamond orifice plate, a hexagonal honeycomb orifice plate and a matrix microporous plate sequentially arranged along the airflow direction. One side of the integrated airflow stabilizing tube is also connected to a constant flow regulating tube.

[0007] The integrated sampling bottle is provided with a cutting sampler, an adsorption sampling vent tube and an absorption sampling vent tube which are connected in sequence along the airflow direction. The bottom of the integrated sampling bottle is connected to a partition unit, and a screen unit is provided on the partition unit.

[0008] As a further solution of the present invention: a movable handle placement groove is provided on the top of the box shell, and a movable handle is rotatably connected to the movable handle placement groove; a human-computer interaction screen is embedded in the front of the box shell, and a ventilation window is connected to one side wall of the box shell; a control cabinet, a placement seat card slot and an energy supply battery are fixedly connected inside the box shell, and the connection positions of the control cabinet and the energy supply battery are respectively arranged on both sides of the placement seat card slot, the control cabinet is connected to the various electrical components of the sampling device for signal transmission, and the energy supply battery is electrically connected to the various electrical components of the sampling device;

[0009] A sampling bottle placement seat is movably placed on the placement seat slot, and the sampling bottle placement seat is provided with a plurality of limiting placement slots, in which integrated sampling bottles are movably placed.

[0010] As a further solution of the present invention, an output pipe and a plurality of input pipes are connected through the top of the box shell, the top of the input pipe is movably sleeved with an input pipe end cap, the bottom end of the input pipe is connected to the air flow cooling pipe of the integrated constant temperature control pipe, the top of the output pipe is movably sleeved with an output pipe end cap, the pipe body of the output pipe is installed with an output air pump, the bottom end of the output pipe is connected to a confluence main pipe, the pipe body of the confluence main pipe is connected to a plurality of confluence branches, the confluence branches are arranged in a one-to-one correspondence with the integrated constant temperature control pipe, and the bottom end of the confluence branch pipe is connected to the gas outlet end of the integrated sampling bottle;

[0011] The inner wall of the input pipe is fixedly connected with a limiting ring, an atmospheric drying cylinder is movably arranged in the input pipe, and the limiting ring is supported on the bottom end of the atmospheric drying cylinder.

[0012] As a further solution of the present invention: the bottom ends of the converging branch pipe and the bottom ends of the integrated airflow stabilizing pipe are both connected to a connecting hose, the bottom ends of the connecting hose are connected to a docking pipe, a docking pressure plate is provided in the box shell, the pipe bodies of the multiple docking pipes are all fixedly connected to the docking pressure plate, a pneumatic push rod is fixedly connected to the center of the upper plate surface of the docking pressure plate, and the upper end of the pneumatic push rod is fixedly connected to the top inner wall of the box shell;

[0013] An outer ring gasket and an inner ring gasket are fixedly connected to the inner wall of the butt pipe. The upper ends of the outer ring gasket and the inner ring gasket are both arranged to be inclined inward, and the installation positions of the inner ring gasket and the outer ring gasket are distributed up and down.

[0014] As a further solution of the present invention: the inner wall of the air flow cooling tube is fixedly connected to a ring-shaped heat sink, and the ring-shaped heat sink is installed with thermoelectric cooling plates distributed in a ring shape. The outside of the tube body of the air flow cooling tube is provided with a number of heat-conducting fins evenly distributed in a ring shape, and one end of the heat-conducting fin embedded in the tube body of the air flow cooling tube is fixedly connected to the ring-shaped heat sink.

[0015] As a further solution of the present invention: a plurality of heat-conducting guide plates are provided in the preheating channel between the airflow preheating tube and the airflow cooling tube. The heat-conducting guide plates are staggered and connected to the inner wall of the airflow preheating tube and the outer wall of the airflow cooling tube, and the heat-conducting guide plates are inclined along the airflow direction.

[0016] A conical guide block is fixedly connected to the inner part of the air flow preheating pipe near the air outlet end of the air flow cooling pipe, and the tip of the conical guide block is arranged at the air outlet port of the air flow cooling pipe. An air guide channel is opened at the air outlet port of the air flow preheating pipe, and the preheating channel and the heating channel are connected through the air guide channel.

[0017] As a further solution of the present invention: a spiral guide groove is opened inside the constant temperature rising tube, the outer wall of the constant temperature rising tube is wrapped with a constant temperature heating film and a heating film substrate in sequence, and the gap between the outer wall of the constant temperature rising tube and the constant temperature heating film is filled with aluminum nitride thermal paste.

[0018] As a further solution of the present invention: a piezoelectric ceramic microvalve and a pressure difference sensor are connected in the constant current regulating tube.

[0019] As a further solution of the present invention: the upper opening of the integrated sampling bottle is sealed and connected with a sealed bottle cap, the middle part of the sealed bottle cap is vertically penetrated and connected with an air inlet duct, the bottom end of the air inlet duct is sealed and docked with the air inlet end of the cutting sampler, the air outlet end of the cutting sampler is connected with a diversion joint, each air outlet joint of the diversion joint is connected with an adsorption sampling vent pipe, the other end of the adsorption sampling vent pipe is connected with a vertically arranged absorption sampling vent pipe, and the bottom of the absorption sampling vent pipe is inserted into the bottom of the integrated sampling bottle, the bottom of the integrated sampling bottle is filled with sampling absorption liquid, the inside of the adsorption sampling vent pipe is filled with sampling adsorbent, one side wall of the integrated sampling bottle is penetrated and connected with an air outlet duct, and a vacuum insulation cavity is opened in the bottle body of the integrated sampling bottle.

[0020] As a further solution of the present invention: the partition unit includes an upper convex partition and a lower concave partition, the screen unit includes a central screen and a peripheral screen, the upper convex partition and the lower concave partition are arranged at intervals on one side, the central screen is connected to the middle convex portion of the upper convex partition, the peripheral screen is evenly distributed in an annular shape and is connected to the plate body of the lower concave partition, and the mesh diameters of the screen units arranged from bottom to top are reduced in sequence;

[0021] A supporting mesh plate is also fixedly connected to the integrated sampling bottle. The connection position of the supporting mesh plate is located above the partition unit. The adsorption sampling vent tube is supported above the supporting mesh plate, and the absorption sampling vent tube passes through the body of the supporting mesh plate.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention is provided with a box shell and a multi-channel sampling assembly. The multi-channel sampling assembly includes multiple sampling channels and multiple integrated sampling bottles. Each sampling channel is connected to an integrated constant temperature control tube and an integrated airflow stabilizing tube. When using the sampling device to sample atmospheric pollutants, multiple groups of samples can be simultaneously sampled through the multi-channel sampling assembly to obtain multiple sampling samples. During sampling, the integrated constant temperature control tube and the integrated airflow stabilizing tube are used to perform constant temperature and constant flow control on the atmosphere, thereby ensuring that the atmosphere is in a constant temperature and constant flow state and enters the integrated sampling bottle for sampling operation, thereby achieving high-precision sampling;

[0024] 2. The integrated constant temperature control tube provided by the present invention includes an airflow cooling tube, an airflow preheating tube and a constant temperature heating tube which are sequentially arranged from the inside to the outside. A cooling channel is formed inside the airflow cooling tube, a preheating channel is formed in the gap between the airflow cooling tube and the airflow preheating tube, and a heating channel is formed in the gap between the airflow preheating tube and the constant temperature heating tube. The integrated airflow stabilizing tube includes a large-diameter diamond-shaped orifice plate, a hexagonal honeycomb orifice plate and a matrix microporous plate which are sequentially arranged along the airflow direction. A constant flow regulating tube is also connected to one side of the integrated airflow stabilizing tube. For the atmosphere entering the integrated constant temperature control tube, the atmospheric temperature is reduced to an intermediate value through the airflow cooling tube, so that the adjustment amplitude of the subsequent temperature control fine adjustment becomes smaller, thereby reducing the heating power of the subsequent temperature control fine adjustment and eliminating thermal inertia. Interference, the pre-cooling treatment of the atmosphere by the airflow cooling tube can reduce the temperature gradient, reduce the non-steady-state heat transfer effect between the airflow and the pipeline, and enable the atmosphere to enter the thermal equilibrium state faster in the subsequent temperature adjustment process. In addition, the atmospheric temperature is lowered by pre-cooling, the gas volume of the atmosphere is contracted, and the measurement error of the flow sensor caused by thermal expansion and contraction of the gas is reduced, turbulent disturbances are suppressed, laminar flow formation is promoted, and the flow velocity distribution is more uniform. After the airflow is preheated by the airflow preheating tube and then heated at a constant temperature by the constant temperature heating tube, the energy required for heating can be greatly reduced, and the constant temperature after heating can be controlled within the optimal sampling temperature range. Therefore, when the sampling device is used for sampling in an environment with a large temperature difference, when the ambient temperature is low, it can pass through the airflow preheating tube and the constant temperature heating tube. The heating pipes work together to maintain the air flow temperature at a constant temperature of a specific temperature. When the ambient temperature is high, the temperature is first lowered and then raised to maintain a constant temperature. That is, it can have better applicability in environments with large temperature differences, greatly improving sampling efficiency and sampling accuracy. It is very suitable for use in environments with large temperature differences. Moreover, since the pipes are arranged in a set in sequence, on the one hand, the space occupied by each pipe can be reduced. On the other hand, the air flow cooling pipe can cool the atmosphere in the cooling channel while the heat generated by the heat exchange will be transported to the preheating channel. When the heating channel heats the atmosphere, part of the heat dissipated will also be transported to the preheating channel, and they are used together to preheat the atmosphere, thereby realizing multi-level utilization of energy. , and there is no need to adopt other additional heat conduction measures for heat transfer. The maximum utilization of heat can be achieved by relying on the specific docking connection relationship of each pipeline. After the atmosphere with constant temperature control enters the integrated airflow stabilizing tube, the expansion-contraction effect of the diagonal direction of the diamond holes of the large-diameter diamond orifice plate is used to decompose the concentrated jet into multiple sub-streams. The sharp edges of the hole edge induce controllable flow separation, weakening the large-scale vortex in advance. Then, the hexagonal structure of the holes of the hexagonal honeycomb orifice plate is used to produce approximately isotropic permeability, eliminating the flow directional deviation, and the honeycomb wall guides the fluid to generate Taylor vortices, converting kinetic energy into ordered vortex motion. Finally, the micropore array of the matrix microporous plate is used to generate a large number of micro-vortices in the airflow, completing the submillimeter turbulent kinetic energy dissipation.Breaking through the limitations of the traditional single hole type of the flow equalizing plate, the cascade control chain of diamond decomposition, honeycomb isotropy, and micropore dissipation is used to achieve multi-objective simultaneous optimization of energy efficiency, noise reduction, and flow equalization. It can also cooperate with the constant flow regulating tube to dynamically adjust the bypass flow. The coordinated effect of the integrated constant temperature regulating tube's creative heat utilization maximization temperature control method, the dynamic adjustment of the branch pipe, and the integrated airflow stabilizing tube's creative noise reduction and flow equalization measures can ensure the stable delivery of constant temperature and constant flow atmosphere to the integrated sampling bottle.

[0025] 3. The integrated sampling bottle provided in the present invention is provided with a cutting sampler, an adsorption sampling vent tube and an absorption sampling vent tube which are connected in sequence along the airflow direction. The bottom of the integrated sampling bottle is connected to a partition unit, and a screen unit is provided on the partition unit. Particulate matter sampling, adsorption sampling and absorption sampling can be performed in sequence in the integrated sampling bottle. During absorption sampling, since the partition unit can divide the sampling absorption liquid into multiple layers, the atmospheric airflow moves upward along the lower plate surface of the partition unit in the form of bubbles and can enter the cavity of the upper layer through the screen unit, that is, it can delay the buffering time of the bubbles in the absorption liquid, and each time it passes through the screen unit, the bubbles can be broken so that the pollutants in the atmosphere can be fully absorbed by the absorption liquid, further improving the accuracy of absorption collection, that is, for the atmosphere in the same channel, multi-stage sampling can be achieved along the flow direction of the atmosphere. Compared with the existing decentralized separate sampling, it can not only greatly improve the sampling efficiency, but also reduce the variable factors of each sample collected by each group of sampling bottles, so that more accurate analysis conclusions can be obtained in the later analysis and processing stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the box shell of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection structure between the sampling bottle placement seat and the box shell of the present invention;

[0029] Figure 4 This is a schematic cross-sectional view of the sampling bottle placement seat of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the multi-channel sampling component of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the integrated constant temperature control pipe and the manifold;

[0032] Figure 7 This is a schematic diagram of the cross-sectional structure of the butt-jointed pipe of the present invention;

[0033] Figure 8 This is a schematic diagram of the cross-sectional structure of the input pipe of the present invention;

[0034] Figure 9 This is a schematic diagram of the cross-sectional structure of the integrated constant temperature control tube of the present invention;

[0035] Figure 10 Schematic diagram of the longitudinal cross-section structure of the air flow cooling tube of the present invention;

[0036] Figure 11 This is a schematic diagram of the local tube body structure of the air flow preheating tube of the present invention;

[0037] Figure 12 This is a schematic diagram of the cross-sectional structure of the constant temperature heating pipe of the present invention;

[0038] Figure 13 Schematic diagram of the cross-sectional structure of the integrated airflow stabilizing tube of the present invention;

[0039] Figure 14 This is a schematic diagram of the structure of the integrated sampling bottle of the present invention;

[0040] Figure 15 This is a schematic diagram of the cross-sectional structure of the integrated sampling bottle of the present invention.

[0041] In the figure: 1. Box shell; 11. Movable handle; 12. Human-computer interaction screen; 13. Ventilation window; 14. Sampling bottle holder; 15. Movable handle holder slot; 16. Control cabinet; 17. Holder slot; 18. Power supply battery; 19. Input pipe end cap; 110. Output pipe end cap; 111. Docking plate; 112. Pneumatic push rod; 113. Connecting hose; 114. Docking pipe; 115. Outer ring gasket; 116. Inner ring gasket; 117. Limiting slot; 2. Input pipe; 21. Limiting ring; 22. Atmospheric drying cylinder; 3. Output pipe; 31. Output vacuum pump; 32. Converging main pipe; 33. Converging branch pipe; 4. Integrated constant temperature control pipe; 41. Air flow cooling pipe; 411. Thermoelectric cooling chip; 412. Annular heat sink; 413. Thermal fin; 42. Air flow preheater Heat pipe; 421, heat conduction guide plate; 422, air guide channel; 423, conical arc guide block; 43, constant temperature heating tube; 431, constant temperature heating film; 432, heating film substrate; 433, spiral guide groove; 5, integrated air flow stabilizing tube; 51, constant flow regulating tube; 52, large-diameter diamond orifice plate; 53, hexagonal honeycomb orifice plate; 54, matrix microporous plate; 55, piezoelectric ceramic microvalve; 56, differential pressure sensor; 6, integrated sampling bottle; 61, sealed bottle cap; 62, air inlet duct; 63, air outlet duct; 64, vacuum insulation chamber; 65, cutting sampler; 66, diversion joint; 67, adsorption sampling vent tube; 68, absorption sampling vent tube; 69, upper convex partition; 610, central screen; 611, lower concave partition; 612, outer screen; 613, supporting mesh plate. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0043] Example 1

[0044] like Figures 1 to 15 As shown, a multi-channel atmospheric pollutant sampling device includes a sampling box, which includes a box shell 1 and a multi-channel sampling assembly arranged in the box shell 1, and the air inlet and outlet ports of the multi-channel sampling assembly are both located on the outside of the box shell 1; the multi-channel sampling assembly includes multiple sampling channels and multiple integrated sampling bottles 6, each sampling channel is connected to an integrated constant temperature control tube 4 and an integrated airflow stabilizing tube 5. When the sampling device is used for sampling atmospheric pollutants, multiple groups of samples can be simultaneously sampled through the multi-channel sampling assembly to obtain multiple sampling samples, and during sampling, the atmosphere is subjected to constant temperature and constant flow control through the integrated constant temperature control tube 4 and the integrated airflow stabilizing tube 5, thereby ensuring that the atmosphere is in a constant temperature and constant flow state and enters the integrated sampling bottle 6 for sampling operation, so as to achieve high-precision sampling;

[0045] The integrated constant temperature control tube 4 includes an airflow cooling tube 41, an airflow preheating tube 42 and a constant temperature heating tube 43 which are sequentially arranged from the inside out. A cooling channel is formed in the airflow cooling tube 41, a preheating channel is formed in the gap between the airflow cooling tube 41 and the airflow preheating tube 42, and a heating channel is formed in the gap between the airflow preheating tube 42 and the constant temperature heating tube 43. The integrated airflow stabilizing tube 5 includes a large-diameter diamond-shaped orifice plate 52, a hexagonal honeycomb orifice plate 53 and a matrix microporous plate 54 which are sequentially arranged along the airflow direction. One side of the integrated airflow stabilizing tube 5 is also connected to a constant flow regulating tube 51. It should be noted that temperature sensors and flow sensors can be installed in each pipe of the integrated constant temperature control tube 4. The atmosphere is cooled to an intermediate value such as 15°C by the airflow cooling tube 41, so that the adjustment range of the subsequent temperature control fine adjustment becomes smaller, from ±25°C to ±10°C, thereby reducing the heating power of the subsequent temperature control fine adjustment and eliminating thermal inertia interference. The pre-cooling treatment of the atmosphere by the airflow cooling tube 41 can reduce the temperature gradient, reduce the non-steady-state heat transfer effect between the airflow and the pipeline, and enable the atmosphere to enter the thermal equilibrium state faster in the subsequent temperature adjustment process. In addition, the atmospheric temperature is reduced by pre-cooling, so that the gas volume of the atmosphere shrinks, and the measurement error of the flow sensor caused by the thermal expansion and contraction of the gas is reduced, turbulent disturbance is suppressed, laminar flow is promoted, and the flow velocity distribution is more uniform. After the airflow is preheated by the airflow preheating tube 42, it is heated at a constant temperature. The tube 43 is heated at a constant temperature to increase the temperature, which can greatly reduce the energy required for heating, and the constant temperature after heating can be controlled within the optimal sampling temperature range. Therefore, when the sampling device is used to sample in an environment with a large temperature difference, when the ambient temperature is low, the air flow preheating tube and the constant temperature heating tube can work together to maintain the air flow temperature at a constant temperature state at a specific temperature. When the ambient temperature is high, the temperature is first lowered and then increased to maintain a constant temperature state, that is, it can have better applicability in an environment with a large temperature difference, greatly improve the sampling efficiency and sampling accuracy, and is very suitable for use in some environments with a large temperature difference. Moreover, since the pipes are arranged in a set in sequence, on the one hand, the space occupied by each pipe can be reduced, and on the other hand, the air flow can be reduced. While the temperature pipe 41 cools the atmosphere in the cooling channel, the heat generated by the heat exchange will be transported to the preheating channel. While the heating channel heats the atmosphere, part of the heat dissipated will also be transported to the preheating channel, and they are used together to preheat the atmosphere, thereby realizing multi-level utilization of energy. In addition, there is no need to adopt other additional heat conduction measures for heat transfer. The maximum utilization of heat can be achieved by relying on the specific docking connection relationship of each pipe. After the atmosphere with constant temperature control enters the integrated airflow stabilizing pipe 5, the expansion-contraction effect of the diagonal direction of the diamond holes of the large-diameter diamond orifice plate 52 is utilized to decompose the concentrated jet into multiple sub-flows. The sharp edges of the hole edge induce controllable flow separation, thereby weakening the large-scale vortex in advance.Then, the hexagonal structure of the holes in the hexagonal honeycomb orifice plate 53 is used to generate approximately isotropic permeability, eliminating the directional deviation of the flow, and the honeycomb wall guides the fluid to generate Taylor vortices, converting kinetic energy into ordered vortex motion. Finally, the micropore array of the matrix microporous plate 54 is used to generate a large number of microvortices in the airflow, completing the submillimeter level turbulent kinetic energy dissipation, breaking through the limitation of the single hole type of the traditional flow equalizing plate, and using the cascade control chain of diamond decomposition, honeycomb isotropy, and micropore dissipation to achieve multi-objective simultaneous optimization of energy efficiency, noise reduction, and flow equalization, and can cooperate with the constant flow regulating tube 51 to dynamically adjust the bypass flow, adopt the integrated constant temperature regulating tube 4's creative heat utilization maximization temperature control method, the branch pipe dynamic adjustment, and the integrated airflow stabilizing tube 5's creative noise reduction and flow equalization measures to coordinate, thereby ensuring that the constant temperature and constant flow atmosphere is stably delivered to the integrated sampling bottle 6;

[0046] The integrated sampling bottle 6 is provided with a cutting sampler 65, an adsorption sampling vent tube 67 and an absorption sampling vent tube 68 which are connected in sequence along the airflow direction. The bottom of the integrated sampling bottle 6 is connected to a partition unit, and a screen unit is provided on the partition unit. Particulate matter sampling, adsorption sampling and absorption sampling can be performed in sequence in the integrated sampling bottle 6. During absorption sampling, since the partition unit can divide the sampling absorption liquid into multiple layers, the atmospheric airflow moves upward along the lower plate surface of the partition unit in the form of bubbles and can enter the cavity of the upper layer through the screen unit, that is, it can delay the buffering time of the bubbles in the absorption liquid, and each time it passes through the screen unit, the bubbles can be broken so that the pollutants in the atmosphere can be fully absorbed by the absorption liquid, further improving the accuracy of absorption collection, that is, for the atmosphere in the same channel, multi-level sampling can be achieved along the flow direction of the atmosphere. Compared with the existing decentralized single sampling, it can not only greatly improve the sampling efficiency, but also reduce the variable factors of each sample collected by each group of sampling bottles, and thus in the later analysis and processing stage, more accurate analysis conclusions can be obtained.

[0047] Example 2

[0048] Improvements based on Example 1:

[0049] like Figures 1 to 7As shown, a movable handle placement slot 15 is provided on the top of the box shell 1, and a movable handle 11 is rotatably connected in the movable handle placement slot 15; a human-computer interaction screen 12 is embedded in the front of the box shell 1, and a ventilation window 13 is connected to the side wall of the box shell 1. A control cabinet 16, a placement seat slot 17 and an energy supply battery 18 are fixedly connected in the box shell 1, and the connection positions of the control cabinet 16 and the energy supply battery 18 are respectively arranged on both sides of the placement seat slot 17. The control cabinet 16 is connected to the various electrical components of the sampling device for signal transmission, and the energy supply battery 18 is electrically connected to the various electrical components of the sampling device. Next, it should be noted that the control cabinet 16 can adopt a processing control cabinet in a constant temperature and constant flow atmospheric sampling device disclosed in the announcement number CN118980552A. The monitored atmospheric temperature signal and flow rate signal can be collected through the control cabinet 16 and displayed through the human-computer interaction screen 12. The operator can make appropriate adjustments according to the displayed temperature and flow rate, and then make the electrical components of the integrated constant temperature control tube 4 and the constant flow control tube 51 perform corresponding actions, so that the atmosphere can be maintained at a set constant temperature and constant flow state, ensuring the smooth progress of sampling;

[0050] A sampling bottle seat 14 is movably mounted on the seat slot 17. The sampling bottle seat 14 is provided with a plurality of limit slots 117. An integrated sampling bottle 6 is movably mounted in the limit slots 117. The sampling bottle seat 14 can be pulled out to facilitate taking out the integrated sampling bottle 6, and then the integrated sampling bottle 6 after sampling can be taken out for subsequent processing and analysis to obtain the concentration value of pollutants or particulate matter in the atmosphere.

[0051] Furthermore, the top of the box shell 1 is connected with an output pipe 3 and multiple input pipes 2, the top of the input pipe 2 is provided with an input pipe end cap 19, the bottom of the input pipe 2 is connected to the air flow cooling pipe 41 of the integrated constant temperature control pipe 4, the top of the output pipe 3 is provided with an output pipe end cap 110, the pipe body of the output pipe 3 is installed with an output air pump 31, the bottom end of the output pipe 3 is connected with a confluence main pipe 32, the pipe body of the confluence main pipe 32 is connected with a number of confluence branch pipes 33, the confluence branch pipes 33 are arranged in a one-to-one correspondence with the integrated constant temperature control pipe 4, and the bottom end of the confluence branch pipe 33 is connected to the integrated sampling bottle The air outlet end of 6 is connected, so that when in use, the air is sucked in through the input pipe 2 by the exhaust action of the output air pump 31, and after being regulated by the integrated constant temperature control tube 4, the constant temperature and constant flow air enters the corresponding integrated sampling bottle 6 for sampling processing. The sampled air is output through the confluence branch pipe 33, converged through the confluence main pipe 32 and discharged from the output pipe 3, so as to realize the atmospheric flow of the entire sampling process. The input pipe end cap 19 and the output pipe end cap 110 provided can respectively block the port parts of the input pipe 2 and the output pipe 3, and play a certain protective role.

[0052] A limiting ring 21 is fixedly connected to the inner wall of the input pipe 2, and an atmospheric drying cylinder 22 is movably arranged inside the input pipe 2, and the limiting ring 21 is supported on the bottom end of the atmospheric drying cylinder 22. The atmospheric drying cylinder can be used to dry the atmosphere entering the pipe to avoid the generation of condensed water when the atmosphere enters the air flow cooling pipe 41 for cooling.

[0053] Furthermore, the bottom end of the converging branch pipe 33 and the bottom end of the integrated airflow stabilizing pipe 5 are both connected to a connecting hose 113, and the bottom end of the connecting hose 113 is connected to a docking pipe 114. A docking pressure plate 111 is provided in the box shell 1, and the pipe bodies of multiple docking pipes 114 are all fixedly connected to the docking pressure plate 111. The center of the upper plate surface of the docking pressure plate 111 is fixedly connected to a pneumatic push rod 112, and the upper end of the pneumatic push rod 112 is fixedly connected to the top inner wall of the box shell 1, and the docking pressure plate can be pushed by the pneumatic push rod 112. 111 moves downward, so that the connecting tube 114 can also move downward. As the connecting tube 114 moves, the length of the connecting hose 113 will also change. When the connecting tube 114 moves downward, the connecting tube 114 can be connected to the air inlet and outlet ends of the integrated sampling bottle 6 respectively, so that the atmosphere regulated by constant temperature and constant flow can smoothly enter the integrated sampling bottle 6, and the sampled atmosphere can be smoothly discharged. The movable setting of the connecting tube 114 also makes it easy to take and put the integrated sampling bottle 6.

[0054] An outer ring gasket 115 and an inner ring gasket 116 are fixedly connected to the inner wall of the butt joint pipe 114. The upper ends of the outer ring gasket 115 and the inner ring gasket 116 are both inclined inward, and the installation positions of the inner ring gasket 116 and the outer ring gasket 115 are distributed up and down. When the butt joint pipe 114 is respectively docked with the air inlet end and the air outlet end of the integrated sampling bottle 6, the docking part can be sealed by the cooperation of the outer ring gasket 115 and the inner ring gasket 116, which can prevent the atmosphere from overflowing from the docking part.

[0055] like Figure 5 、 Figure 6 、 Figures 8 to 12As shown, the inner wall of the air flow cooling tube 41 is fixedly connected to an annular heat sink 412, and a thermoelectric cooling sheet 411 distributed in an annular shape is installed on the annular heat sink 412. A number of annular evenly distributed heat-conducting fins 413 are provided on the outside of the tube body of the air flow cooling tube 41, and one end of the heat-conducting fins 413 embedded in the tube body of the air flow cooling tube 41 is fixedly connected to the annular heat sink 412. Specifically, the thermoelectric cooling sheet 411 adopts the model TEC1-12706, and the heat-conducting fins 413 have a wing height of 15 mm. The thermoelectric cooling sheet 411 is bonded to the annular heat sink 412 by a thermal conductive glue σ=8W / m·K, and the annular distribution of the thermoelectric cooling sheet 411 can fully contact with the atmosphere in the tube, and the annular heat sink 412 and the heat-conducting fins 413 can transfer heat to the outside of the air flow cooling tube 41, thereby improving the cooling rate of the atmosphere.

[0056] Specifically, when the sampling device is used in a relatively high temperature environment, the thermoelectric cooling plate 411 can be used to narrow the subsequent temperature control range.

[0057] Ambient temperature fluctuations can be dramatic, reaching 50°C in the summer. Directly adjusting the temperature to a target temperature of, say, 25°C requires significant power consumption. Thermoelectric cooler 411 reduces the temperature to an intermediate value, such as 15°C, reducing the adjustment range of the subsequent temperature control unit from ±25°C to ±10°C, reducing the second-stage heating / cooling power by 60%. Thermoelectric cooler 411's functions include:

[0058] 1. Eliminate thermal inertia interference. According to Fourier's law of heat conduction, pre-cooling treatment can reduce the temperature gradient, reduce the unsteady-state heat transfer effect between the airflow and the pipeline, and enable the system to enter a thermal equilibrium state faster.

[0059] Second, fluid mechanics optimization: pre-cooling reduces the gas temperature, shrinks the gas volume, reduces the measurement error of the flow sensor caused by thermal expansion and contraction of the gas, and stabilizes the gas volume. For example, from 50℃ to 25℃, the volume shrinks by about 8.3%;

[0060] Suppress turbulent disturbances, increase the viscosity of low-temperature gas, reduce the Reynolds number, promote laminar flow formation, and make the flow velocity distribution more uniform.

[0061] Furthermore, a plurality of heat-conducting guide plates 421 are provided in the preheating channel between the airflow preheating tube 42 and the airflow cooling tube 41. The heat-conducting guide plates 421 are staggeredly connected to the inner wall of the airflow preheating tube 42 and the outer wall of the airflow cooling tube 41, and the heat-conducting guide plates 421 are tilted along the airflow direction. The specific tilting method can form a structural principle similar to that of a Tesla valve, which has a good one-way guiding effect on the airflow. At the same time, the heat-conducting guide plates 421 can conduct heat treatment to the heat generated by the airflow cooling tube 41 in the cooling heat exchange with the atmosphere in the cooling channel and part of the heat dissipated by the heating channel in the heating treatment of the atmosphere, that is, the heat distribution in the preheating channel can be uniform, ensuring that a good preheating effect can be achieved when preheating the atmospheric airflow.

[0062] The airflow preheating tube 42 is fixedly connected to a conical guide block 423 at the inner position of the tube near the air outlet end of the airflow cooling tube 41, and the tip of the conical guide block 423 is arranged at the air outlet port of the airflow cooling tube 41, which can form a guiding effect on the airflow, so that after the airflow is discharged from the airflow cooling tube 41, it can enter the preheating channel between the airflow preheating tube 42 and the airflow cooling tube 41 in a uniform and dispersed manner to flow. An air guide channel 422 is provided at the air outlet port of the airflow preheating tube 42, and the preheating channel and the heating channel are connected through the air guide channel 422. The preheated airflow can be directly transported to the heating channel through the opened air guide channel 422, thereby shortening the airflow transport distance and preventing the preheated airflow from cooling.

[0063] Furthermore, a spiral guide groove 433 is provided inside the constant temperature heating tube 43, and the outer wall of the constant temperature heating tube 43 is wrapped with a constant temperature heating film 431 and a heating film substrate 432 in sequence, and the gap between the outer wall of the constant temperature heating tube 43 and the constant temperature heating film 431 is filled with aluminum nitride thermal paste. The spiral guide groove 433 can enable the atmospheric airflow to be transported in a spiral shape in the heating channel. The coordinated effect of the heating film substrate 432 and the filled aluminum nitride thermal paste can enable the constant temperature heating film 431 to uniformly heat the atmosphere in the heating channel, thereby achieving fine adjustment of the atmospheric airflow temperature and ensuring that the atmosphere can be transported at a constant temperature.

[0064] Specifically, the resistance of the constant temperature heating film 431 is 0.8Ω / cm², and the heating film is bonded to the heating film substrate 432 through a silver paste printed circuit. The constant temperature rising tube 43 includes but is not limited to a quartz glass tube. The temperature sensor installed in the constant temperature rising tube 43 includes but is not limited to an infrared temperature measuring probe. The response time of the infrared temperature measuring probe is 10ms, and the infrared temperature measuring probe is installed at the outlet end of the constant temperature rising tube 43.

[0065] like Figure 5 、 Figure 6 and Figure 13As shown, a piezoelectric ceramic microvalve 55 and a pressure differential sensor 56 are connected to the constant flow regulating tube 51. The pressure differential sensor 56 can monitor the pressure of the atmospheric airflow, control the opening and closing of the piezoelectric ceramic microvalve 55 according to the monitoring results, and dynamically adjust the bypass flow so that the atmosphere in the integrated airflow stabilizing tube 5 can be in a constant flow state.

[0066] like Figure 1 、 Figure 5 、 Figure 14 and Figure 15As shown, the upper end opening of the integrated sampling bottle 6 is sealed and connected with a sealed bottle cap 61, and the middle part of the sealed bottle cap 61 is vertically penetrated and connected with an air inlet duct 62. The bottom end of the air inlet duct 62 is sealed and docked with the air inlet end of the cutting sampler 65, and the air outlet end of the cutting sampler 65 is connected with a shunt joint 66. Each air outlet joint of the shunt joint 66 is connected with an adsorption sampling vent pipe 67, and the other end of the adsorption sampling vent pipe 67 is connected with an absorption sampling vent pipe 68 arranged vertically, and the bottom of the absorption sampling vent pipe 68 is inserted into the integrated sampling bottle 6. The bottom of the bottle of the integrated sampling bottle 6 is filled with a sampling absorption liquid, and the inside of the adsorption sampling vent tube 67 is filled with a sampling adsorbent. A side wall of the integrated sampling bottle 6 is connected with an air outlet duct 63. A vacuum insulation cavity 64 is provided in the body of the integrated sampling bottle 6, and the inside of the bottle can be sealed by a sealing bottle cap 61. When the integrated sampling bottle 6 is connected to the sampling channel, it can be connected to the confluence branch 33 and the integrated air flow stabilizing pipe 5 respectively through the air inlet duct 62 and the air outlet duct 63. The connecting hose 113 is connected, so that the air flow can enter the cutting sampler 65, the adsorption sampling vent tube 67 and the absorption sampling vent tube 68 in turn, realizing graded process sampling, and the diversion joint 66 can enable multiple adsorption sampling vent tubes 67 to perform adsorption sampling at the same time, further improving the adsorption sampling efficiency; at the same time, since the cutting sampler 65 is detachably connected to the integrated sampling bottle 6, it can be replaced according to actual collection needs to meet the targeted collection of PM10, PM2.5 and PM1.0 in the atmosphere, and multiple types of collection operations can be realized on the atmosphere. The vacuum insulation chamber 64 provided has a good thermal insulation effect, which can avoid the influence of external temperature during the collection process, further improving the collection accuracy; it should be noted that the sampling absorption liquid includes but is not limited to formaldehyde buffer absorption liquid, Saltzman method absorption liquid, indigo disulfonate sodium IDS absorption liquid, dilute sulfuric acid absorption liquid, boric acid absorption liquid, nitric acid absorption liquid; the sampling adsorbent includes but is not limited to: polymer porous microspheres: Tenax TA poly 2,6-diphenyl paraphenylene ether, Chromosorb series such as Chromosorb106, Porapak series; molecular sieves: 3A, 5A, 13X; carbon molecular sieves: Carboxen, Carbotrap; alumina and calcium sulfate; the cutting plates provided in the cutting sampler 65 include but are not limited to PM10, PM2.5, PM1.0 and TSP cutting plates, and the filter membranes provided in the cutting sampler 65 include but are not limited to PM10, PM2.5, PM1.0 and TSP filter membranes.

[0067] Furthermore, the partition unit includes an upper convex partition 69 and a lower concave partition 611, and the screen unit includes a central screen 610 and a peripheral screen 612. The upper convex partition 69 and the lower concave partition 611 are arranged at intervals on one side. The central screen 610 is connected to the middle convex part of the upper convex partition 69, and the peripheral screen 612 is evenly distributed in an annular shape and connected to the plate body of the lower concave partition 611. The mesh diameters of the screen units arranged from bottom to top decrease successively, ensuring that each time the bubbles pass through the screen, they can be broken to form smaller bubbles, so that pollutants in the atmosphere can be fully absorbed by the absorption liquid, further improving the accuracy of absorption and collection.

[0068] A supporting mesh plate 613 is also fixedly connected to the integrated sampling bottle 6. The connection position of the supporting mesh plate 613 is located above the partition unit. The adsorption sampling vent tube 67 is supported above the supporting mesh plate 613, and the absorption sampling vent tube 68 passes through the body of the supporting mesh plate 613. The supporting mesh plate 613 can support and limit the adsorption sampling vent tube 67, thereby ensuring that the cutting sampler 65 can also be stably placed in the integrated sampling bottle 6, and the mesh holes opened on the body of the supporting mesh plate 613 can facilitate the passage of airflow, so that the airflow can fill the integrated sampling bottle 6 and then be discharged through the air outlet duct 63. During a long sampling process, the temperature in the bottle can be kept consistent with the airflow temperature, which is also beneficial to improving the accuracy of collection.

[0069] Working principle: Through the suction effect of the output vacuum pump 31, the atmosphere is drawn in through the input pipe 2. For the atmosphere entering the integrated constant temperature control pipe 4, when the ambient atmospheric temperature is too high, the atmospheric temperature is reduced to an intermediate value through the air flow cooling pipe 41, and then the air flow is preheated through the air flow preheating pipe 42, and then constant temperature heating and heating is performed through the constant temperature heating pipe 43, which can greatly reduce the energy required for heating, and the constant temperature after heating can be controlled within the optimal sampling temperature range. After adjustment by the integrated constant temperature control pipe 4, the constant temperature and constant flow atmosphere enters the corresponding integrated sampling bottle 6 for sampling and processing. When the ambient atmospheric temperature is too low, constant temperature heating and heating is performed through the constant temperature heating pipe 43. During the heating and heating process, the temperature in the air flow preheating pipe 42 will also increase accordingly, thereby achieving the preheating of the relatively low atmospheric temperature first, and then further heating to a constant temperature state, and then the constant temperature atmospheric airflow maintaining the mobile temperature is delivered to the integrated sampling bottle 6, and the particles are sequentially collected in the integrated sampling bottle 6. Particle sampling, adsorption sampling and absorption sampling, and during absorption sampling, since the partition unit is set up to divide the sampling absorption liquid into multiple layers, the atmospheric airflow moves upward along the lower plate surface of the partition unit in the form of bubbles, and can enter the cavity of the upper layer through the screen unit, that is, it can delay the buffering time of the bubbles in the absorption liquid, and the bubbles can be broken each time passing through the screen unit, so that the pollutants in the atmosphere can be fully absorbed by the absorption liquid, further improving the accuracy of absorption collection, and the sampled atmosphere is output through the confluence branch pipe 33, and then converged through the confluence main pipe 32 and discharged from the output pipe 3 to realize the atmospheric flow of the entire sampling process, and multiple groups of sampling can be carried out simultaneously through the multi-channel sampling assembly set up to obtain multiple sampling samples, and during sampling, the atmosphere is controlled at a constant temperature and a constant flow by the integrated constant temperature control pipe 4 and the integrated airflow stabilizing pipe 5, thereby ensuring that the atmosphere is in a constant temperature and constant flow state and enters the integrated sampling bottle 6 for sampling operation to achieve high-precision sampling.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0071] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A multi-channel atmospheric pollutant sampling device, comprising a sampling box, characterized in that: The sampling box comprises a box shell (1) and a multi-channel sampling assembly arranged in the box shell (1), wherein the air inlet and outlet ports of the multi-channel sampling assembly are both located outside the box shell (1); the multi-channel sampling assembly comprises a plurality of sampling channels and a plurality of integrated sampling bottles (6), and each of the sampling channels is connected to an integrated constant temperature control tube (4) and an integrated air flow stabilizing tube (5); The integrated constant temperature control tube (4) includes an airflow cooling tube (41), an airflow preheating tube (42) and a constant temperature heating tube (43) which are sequentially arranged from the inside out. A cooling channel is formed in the airflow cooling tube (41). The gap between the airflow cooling tube (41) and the airflow preheating tube (42) forms a preheating channel. The gap between the airflow preheating tube (42) and the constant temperature heating tube (43) forms a heating channel. The integrated airflow stabilizing tube (5) includes a large-diameter diamond orifice plate (52), a hexagonal honeycomb orifice plate (53) and a matrix microporous plate (54) which are sequentially arranged along the airflow direction. One side of the integrated airflow stabilizing tube (5) is also connected to the constant flow regulating tube (51). The integrated sampling bottle (6) is provided with a cutting sampler (65), an adsorption sampling vent pipe (67) and an absorption sampling vent pipe (68) which are sequentially connected along the airflow direction. The bottom of the integrated sampling bottle (6) is connected to a partition unit, and a screen unit is provided on the partition unit.

2. The multi-channel air pollutant sampling device according to claim 1, characterized in that: The top of the box shell (1) is provided with a movable handle placement groove (15), and a movable handle (11) is rotatably connected in the movable handle placement groove (15); a human-machine interaction screen (12) is embedded in the front of the box shell (1), and a ventilation window (13) is connected to a side wall of the box shell (1); a control cabinet (16), a placement seat slot (17) and an energy supply battery (18) are fixedly connected in the box of the box shell (1), and the connection positions of the control cabinet (16) and the energy supply battery (18) are respectively arranged on both sides of the placement seat slot (17); the control cabinet (16) is connected to each electrical component of the sampling device for signal transmission, and the energy supply battery (18) is electrically connected to each electrical component of the sampling device; A sampling bottle placement seat (14) is movably placed on the placement seat slot (17), and the sampling bottle placement seat (14) is provided with a plurality of position-limiting placement slots (117), and an integrated sampling bottle (6) is movably placed in the position-limiting placement slots (117).

3. The multi-channel air pollutant sampling device according to claim 2, characterized in that: An output tube (3) and a plurality of input tubes (2) are connected through the top of the box shell (1), the top of the input tube (2) is provided with an input tube end cap (19), the bottom of the input tube (2) is connected to the air flow cooling tube (41) of the integrated constant temperature control tube (4), the top of the output tube (3) is provided with an output tube end cap (110), the tube body of the output tube (3) is installed with an output air pump (31), the bottom end of the output tube (3) is connected to a confluence main tube (32), the tube body of the confluence main tube (32) is connected to a plurality of confluence branch tubes (33), the confluence branch tubes (33) are arranged in a one-to-one correspondence with the integrated constant temperature control tube (4), and the bottom end of the confluence branch tube (33) is connected to the air outlet end of the integrated sampling bottle (6); A limiting ring (21) is fixedly connected to the inner wall of the input pipe (2), an atmospheric drying cylinder (22) is movably arranged in the input pipe (2), and the limiting ring (21) is supported on the bottom end of the atmospheric drying cylinder (22).

4. The multi-channel air pollutant sampling device according to claim 3, characterized in that: The bottom ends of the branch pipe (33) and the integrated airflow stabilizing pipe (5) are both connected to a connecting hose (113), and the bottom ends of the connecting hose (113) are connected to a docking pipe (114). A docking pressure plate (111) is provided in the box shell (1), and the pipe bodies of the plurality of docking pipes (114) are all fixedly connected to the docking pressure plate (111). A pneumatic push rod (112) is fixedly connected to the center of the upper plate surface of the docking pressure plate (111), and the upper end of the pneumatic push rod (112) is fixedly connected to the top inner wall of the box shell (1); An outer ring gasket (115) and an inner ring gasket (116) are fixedly connected to the inner wall of the butt-joint pipe (114), the upper ends of the outer ring gasket (115) and the inner ring gasket (116) are both arranged in an inwardly inclined shape, and the installation positions of the inner ring gasket (116) and the outer ring gasket (115) are distributed in an upper and lower manner.

5. The multi-channel air pollutant sampling device according to claim 1, characterized in that: The inner wall of the airflow cooling tube (41) is fixedly connected to an annular heat sink (412), and the annular heat sink (412) is mounted with annularly distributed thermoelectric cooling fins (411). The outer side of the tube body of the airflow cooling tube (41) is provided with a plurality of annularly evenly distributed heat conducting fins (413), and one end of the heat conducting fin (413) embedded in the tube body of the airflow cooling tube (41) is fixedly connected to the annular heat sink (412).

6. The multi-channel air pollutant sampling device according to claim 5, characterized in that: A plurality of heat-conducting guide plates (421) are provided in the preheating channel between the airflow preheating tube (42) and the airflow cooling tube (41), the heat-conducting guide plates (421) are distributed in a staggered manner and connected to the inner wall of the airflow preheating tube (42) and the outer wall of the airflow cooling tube (41), and the heat-conducting guide plates (421) are inclined along the airflow direction; A conical arc surface guide block (423) is fixedly connected to the inner portion of the air flow preheating pipe (42) near the air outlet end of the air flow cooling pipe (41), and the tip portion of the conical arc surface guide block (423) is arranged at the air outlet port of the air flow cooling pipe (41). An air guide channel (422) is provided at the air outlet port of the air flow preheating pipe (42), and the preheating channel and the heating channel are connected via the air guide channel (422).

7. The multi-channel air pollutant sampling device according to claim 6, characterized in that: The constant temperature heating tube (43) has a spiral guide groove (433) formed inside the tube, the outer wall of the constant temperature heating tube (43) is wrapped with a constant temperature heating film (431) and a heating film substrate (432) in sequence, and the gap between the outer wall of the constant temperature heating tube (43) and the constant temperature heating film (431) is filled with aluminum nitride thermal paste.

8. The multi-channel air pollutant sampling device according to claim 1, characterized in that: The constant current regulating tube (51) is internally connected to a piezoelectric ceramic microvalve (55) and a differential pressure sensor (56).

9. The multi-channel air pollutant sampling device according to claim 1, characterized in that: The upper opening of the integrated sampling bottle (6) is sealed and connected to a sealed bottle cap (61), and the middle part of the sealed bottle cap (61) is vertically penetrated and connected to an air inlet conduit (62). The bottom end of the air inlet conduit (62) is sealed and docked with the air inlet end of the cutting sampler (65). The air outlet end of the cutting sampler (65) is connected to a diverter joint (66), and each air outlet joint of the diverter joint (66) is connected to an adsorption sampling vent pipe (67). The adsorption sampling vent pipe (67) The other end is connected to a vertically arranged absorption sampling vent tube (68), and the bottom of the absorption sampling vent tube (68) is inserted into the bottom of the integrated sampling bottle (6). The bottom of the integrated sampling bottle (6) is filled with a sampling absorption liquid, and the inside of the absorption sampling vent tube (67) is filled with a sampling adsorbent. A side wall of the integrated sampling bottle (6) is penetrated and connected to an air outlet conduit (63), and a vacuum insulation cavity (64) is opened in the bottle body of the integrated sampling bottle (6).

10. The multi-channel air pollutant sampling device according to claim 9, characterized in that: The partition unit includes an upper convex partition (69) and a lower concave partition (611), and the screen unit includes a central screen (610) and a peripheral screen (612). The upper convex partition (69) and the lower concave partition (611) are arranged on one side in a spaced manner. The central screen (610) is connected to the middle convex portion of the upper convex partition (69). The peripheral screen (612) is connected to the plate body of the lower concave partition (611) in a ring-shaped and evenly distributed manner. The mesh diameters of the screens of the screen unit arranged from bottom to top decrease in sequence. The integrated sampling bottle (6) is further fixedly connected to a supporting mesh plate (613), wherein the connection position of the supporting mesh plate (613) is located above the partition unit, the adsorption sampling vent tube (67) is supported above the supporting mesh plate (613), and the absorption sampling vent tube (68) passes through the body of the supporting mesh plate (613).

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