Multi-site gas collection device

Abstract

The invention discloses a multi-site gas collection device, and belongs to the field of gas collection devices. The multi-site gas collection device comprises a gas collection assembly, a gas collection control assembly, a hose assembly, a collection pipe and a fixing assembly used for supporting the gas collection assembly and placing the gas collection control assembly. The gas collection assembly comprises a gas guide main pipe with the bottom end movably connected to the fixing assembly, a gas collection ring sleeve movably connected to the top end of the gas guide main pipe and a plurality of gas guide branch pipe sets, the gas guide branch pipe sets are detachably connected to the gas collection ring sleeve, and gas collection parts are detachably arranged at the ends, away from the gas collection ring sleeve, of the gas guide branch pipe sets. The multi-site gas collection device has the beneficial effects that the device replaces an existing manual multi-site gas collection mode, multi-site gas collection is achieved, meanwhile, the problem that gas collection is not uniform in manual gas collection is solved, and experimental errors are reduced.

Description

Technical Field

[0001] The invention relates to the field of gas collection devices, in particular to a multi-point gas collection device. Background Art

[0002] With the improvement of people's living standards, the enhancement of public environmental awareness and the advancement of science and technology, people have higher and higher requirements for the quality of ambient air in their living and working places. In order to protect people's health, the national standards GB 18883-2022 "Indoor Air Quality Standard" and GB 3095-2012 "Ambient Air Quality Standard" clearly define the concentration of pollutants in ambient air, and determine whether the ambient air quality meets the standards by collecting and analyzing ambient air. The sampling of ambient air is an important part of gas composition analysis. Scientific gas sample collection methods are the basis for accurate analysis of gas composition and content, and are of great significance to ensure accurate analysis of pollutant concentrations in gas samples.

[0003] At present, gas sample collection mainly involves collecting a certain volume of air samples at a single sampling point through an adsorption tube, and performing qualitative and quantitative analysis of pollutants through a thermal desorption-gas chromatography-mass spectrometer. In order to reduce experimental errors, it is necessary to collect gas at multiple locations and analyze multiple collected samples. In existing methods, gas collectors perform simple and repetitive gas collection, which is labor-intensive. In addition, the difference in gas collection height at each location will cause uneven gas collection, which will lead to inaccurate test results. In addition, existing gas collection instruments are large in size and inconvenient to move. Summary of the invention

[0004] The present invention provides a multi-point gas collection device, which replaces the existing manual multi-point gas collection method, realizes multi-point gas collection, improves production efficiency, saves labor, and also reduces the problem of uneven gas collection existing in manual gas collection, reduces experimental errors, and the device is detachable and can be easily moved.

[0005] The technical solution of the present invention is as follows:

[0006] The gas collecting assembly is used for guiding gas; the gas collecting assembly comprises a gas guiding main pipe whose bottom end is movably connected to the fixed assembly, a gas collecting ring sleeve movably connected to the top of the gas guiding main pipe and a plurality of gas guiding branch pipe groups, the bottom end of the gas guiding main pipe and the top end of the gas collecting ring sleeve are both closed ends, the gas guiding branch pipe groups are detachably connected to the gas collecting ring sleeve and are arranged at intervals along the circumference of the gas collecting ring sleeve, the inner cavity of the gas guiding branch pipe group is communicated with the inner cavity of the gas collecting ring sleeve, the gas guiding branch pipe group is a plurality of extension pipes connected in sequence, and a gas collecting piece is detachably provided at one end of the gas guiding branch pipe group away from the gas collecting ring sleeve, and the gas collecting pieces connected by the plurality of gas guiding branch pipe groups are at the same height position; the gas collecting assembly also comprises a first pipe connector, and the gas collecting ring sleeve and the gas guiding branch pipe group are connected by the first pipe connector; the first pipe connector is an intermediate transition portion and connecting columns located on both sides of the intermediate transition portion; the gas collecting ring sleeve is provided with second through holes at intervals along its circumference, one of the connecting columns of the first pipe connector is connected to the second through hole, and the other connecting column of the first pipe connector is connected to the gas guiding branch pipe group;

[0007] A gas collection control component, used to control the gas flow rate and sampling time during the gas collection process;

[0008] A hose assembly is used to connect the gas collection assembly and the gas collection control assembly and guide the gas; the hose assembly includes a first hose and a second hose, one end of the first hose is detachably connected to the gas guide pipe, the other end of the first hose is detachably connected to the collection pipe, one end of the second hose is detachably connected to the gas collection control assembly, and the other end of the second hose is detachably connected to the collection pipe;

[0009] A collection tube is detachably connected in the middle of the hose assembly, and the collection tube is used to collect gas; the hose assembly is communicated with the gas collection assembly and the inside of the collection tube respectively;

[0010] The fixed assembly is used to support the gas collection assembly and place the gas collection control assembly.

[0011] According to the aforementioned multi-point gas collection device, the gas guide main pipe is connected to the gas collection ring sleeve through a clamp;

[0012] A first convex ring is arranged at the top of the outer surface of the gas guide pipe, a second convex ring is arranged at the bottom of the outer surface of the gas collecting ring sleeve, the outer diameters of the first convex ring and the second convex ring are equal, and a limiting groove is arranged at the middle position of the inner surface of the clamp, and the limiting groove is adapted to the first convex ring and the second convex ring;

[0013] The upper end of the gas guide main pipe is provided with a first convex body. When the gas guide main pipe is in a connected state with the gas collecting ring sleeve, the first convex body is embedded in the gas collecting ring sleeve.

[0014] Furthermore, at least one extension pipe is provided between the gas guide pipe and the gas collection ring sleeve, and the extension pipe and the gas guide pipe, the extension pipe and the gas collection ring sleeve, and adjacent extension pipes are connected by clamps;

[0015] A third convex ring is arranged at the top end of the outer surface of the extension tube, and a fourth convex ring is arranged at the bottom end of the outer surface of the extension tube. The outer diameters of the third convex ring and the fourth convex ring are equal to the outer diameter of the first convex ring.

[0016] A second convex body is provided at the upper end of the extension tube. When the extension tube is in a connected state with the gas collecting ring sleeve, the second convex body is embedded in the gas collecting ring sleeve. When adjacent extension tubes are in a connected state, the second convex body of the lower extension tube is embedded in the upper extension tube. When the extension tube is in a connected state with the gas guiding main pipe, the first convex body of the gas guiding main pipe is embedded in the extension tube.

[0017] According to the aforementioned multi-point gas collection device, the extension tubes constituting the gas branch tube group have the same diameter;

[0018] Adjacent extension pipes are connected via a second pipe connector, and the structure of the second pipe connector is the same as that of the first pipe connector.

[0019] According to the aforementioned multi-point gas collection device, the diameters of the extension tubes of the gas guide branch tube group toward the gas collection piece are successively reduced, adjacent extension tubes are connected by threads, and the last extension tube away from the gas collection ring is connected to the gas collection piece by a reducing connector;

[0020] The reducing connector includes a sizing tube, a connecting portion and a reducing tube which are interconnected. The sizing tube is detachably connected to the gas collecting piece, and the sizing tube is connected to the gas collecting piece. The connecting portion is integrally formed between the sizing tube and the reducing tube, and is used to connect the sizing tube and the reducing tube. The diameter of the reducing tube gradually decreases from one end close to the connecting portion to the end away from the connecting portion, and the last section of the extension tube away from the gas collecting ring sleeve is tightly sleeved on the reducing tube.

[0021] Furthermore, three annular sealing rings are fixed on the outer wall of the reducer, the diameters of the three annular sealing rings increase successively, and the three annular sealing rings are evenly arranged along the axial direction of the reducer;

[0022] When the extension tube is tightly sleeved on the reducer, the extension tube is covered on one of the annular sealing rings.

[0023] According to the aforementioned multi-point gas collection device, a connecting ring is provided at one end of the first hose and one end of the second hose, the inner diameter of the connecting ring is consistent with the outer diameter of the collection tube, and the end of the collection tube is movably connected to the connecting ring.

[0024] According to the aforementioned multi-site gas collection device, the gas collection control assembly includes an upper shell and a lower shell, and the upper shell is hingedly connected to the lower shell;

[0025] The upper shell is provided with a power switch, a knob for controlling the gas flow rate, a knob for controlling the gas collection amount and a display screen, and the inner cavity of the lower shell is provided with an electric pump, a controller, a solenoid valve, a flow rate control valve and a battery, and the controller is electrically connected to the power switch, the knob for controlling the gas flow rate, the knob for controlling the gas collection amount, the display screen, the electric pump, the solenoid valve, the flow rate control valve and the battery respectively;

[0026] The side wall of the lower shell is provided with an air inlet and an exhaust port, and the air inlet, the flow rate control valve, the solenoid valve, the electric pump and the exhaust port are connected in sequence through pipelines; the end of the second hose is detachably connected to the air inlet.

[0027] According to the aforementioned multi-point gas collection device, a dustproof mesh cover is provided on the outer side of the gas collecting member;

[0028] A drying pipe is arranged in the middle of the first hose.

[0029] According to the aforementioned multi-point gas collection device, the fixing assembly includes a base plate and a mounting tube vertically fixedly disposed on the base plate, and the bottom end of the gas guide pipe is movably connected in the mounting tube;

[0030] The fixing assembly also includes adjustment support legs arranged at the four corners of the bottom surface of the bottom plate and a level bubble meter arranged on the top surface of the bottom plate.

[0031] Compared with the prior art, the multi-point gas collection device provided by the present invention has at least the following beneficial effects:

[0032] (1) The multi-point gas collection device replaces the existing manual multi-point gas collection method, realizes multi-point gas collection, improves production efficiency, saves labor, and also reduces the problem of uneven gas collection in manual gas collection, reduces experimental errors, and the device is detachable and easy to move;

[0033] (2) At least one extension tube is provided between the gas guide pipe and the gas collecting ring sleeve. The number of extension tubes can be adjusted according to actual needs to adjust the height of the gas collecting piece to meet the requirements of different sampling heights;

[0034] (3) The diameters of the extension tubes of the gas branch tube group toward the gas collecting component decrease successively. Adjacent extension tubes are connected by threads. The last extension tube away from the gas collecting ring is connected to the gas collecting component by a reducer. The reducer can adapt to extension tubes of different diameters to meet the use of different numbers of gas branch tube groups, thus solving the problem that the extension tubes close to the gas collecting component bend downward due to gravity, causing the gas collecting component to deviate from the set gas collection height. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a perspective view of a multi-point gas collection device according to Example 1;

[0036] Fig. 2 is a perspective view of the installation cylinder;

[0037] FIG3 is a perspective view of the gas collecting assembly of Example 1;

[0038] FIG4 is a three-dimensional view of the connection state of the gas guide main pipe and the gas collecting ring sleeve of Example 1;

[0039] FIG5 is a perspective view of the air guide pipe;

[0040] FIG6 is a front view of the air guide main pipe;

[0041] FIG7 is a perspective view of a gas collection ring;

[0042] FIG8 is a perspective view of a clamp;

[0043] FIG9 is a perspective view of a first pipe connector;

[0044] FIG10 is a perspective view of the first hose, the second hose, the connecting ring and the collection tube;

[0045] FIG11 is a perspective view of the gas collection control assembly in a closed state;

[0046] FIG12 is a perspective view of the gas collection control assembly in an open state;

[0047] FIG13 is a perspective view of the air guide pipe assembly, the air collecting member and the dustproof screen in connection;

[0048] FIG14 is a perspective view of a multi-point gas collection device according to Example 2;

[0049] FIG15 is a perspective view of the extension pipe of Example 2;

[0050] FIG16 is a front view of the extension pipe of Example 2;

[0051] FIG17 is a perspective view of a multi-point gas collection device according to Example 3;

[0052] FIG18 is a partial enlarged view of point A in FIG17;

[0053] FIG. 19 is a perspective view of a reducer connector.

[0054] Description of reference numerals:

[0055] 10. Fixing assembly; 11. Bottom plate; 12. Mounting tube; 121. Through slot; 13. Adjusting support legs; 14. Level bubble meter;

[0056] 20. Gas collecting assembly; 21. Gas guiding main pipe; 211. First through hole; 212. Connecting port; 213. First convex ring; 214. First convex body; 22. Gas collecting ring; 221. Second through hole; 222. Second convex ring; 23. Gas guiding branch pipe group; 24. Gas collecting part; 25. First pipe connecting piece; 251. Intermediate transition part; 252. Connecting column; 26. Second pipe connecting piece; 27. Clamp; 271. Limiting groove; 28. Extension pipe; 281. Third convex ring; 282. Fourth convex ring; 283. Second convex body; 29. ​​Reducer connector; 291. Sizing pipe; 292. Connecting part; 293. Reducer; 294. Annular sealing ring;

[0057] 30. Gas collection control assembly; 31. Upper shell; 32. Lower shell; 33. Power switch; 34. Control knob for gas flow rate; 35. Control knob for gas collection volume; 36. Display screen; 37. Electric pump; 38. Controller; 39. Solenoid valve; 310. Flow rate control valve; 311. Battery; 312. Air inlet; 313. Exhaust port;

[0058] 40. Hose assembly; 41. First hose; 42. Second hose; 43. Connecting ring;

[0059] 50. Collection tube;

[0060] 60. Dustproof mesh cover;

[0061] 70. Drying tube. DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0063] Embodiment 1:

[0064] The technical solution of Example 1 is described in detail with reference to Figures 1 to 13. The multi-point gas collection device includes a fixed component 10, a gas collection component 20 movably connected to the fixed component 10, and a gas collection control component 30. The gas collection component 20 and the gas collection control component 30 are connected by a hose component 40. A collection tube 50 is detachably connected in the middle of the hose component 40. The hose component 40 is communicated with the inside of the gas collection component 20 and the collection tube 50, respectively.

[0065] The fixing assembly 10 is used to support the gas collecting assembly 20 and place the gas collection control assembly 30; the gas collecting assembly 20 is used to guide the gas; the gas collection control assembly 30 is used to control the gas flow rate and sampling time of the gas collection process; the hose assembly 40 is used to connect the gas collecting assembly 20 and the gas collection control assembly 30 and to guide the gas; the collection tube 50 is used to collect gas, specifically, the collection tube 50 is an activated carbon sampling tube or a Tenax sampling tube, and can also be other components that can collect gas. Before using the Tenax sampling tube for sampling, the sampling tube and the adsorbent must be activated.

[0066] The gas collecting assembly 20 includes a gas guiding main pipe 21 whose bottom end is movably connected to the fixed assembly 10, a gas collecting ring sleeve 22 movably connected to the top of the gas guiding main pipe 21, and a plurality of gas guiding branch pipe groups 23. The bottom end of the gas guiding main pipe 21 and the top of the gas collecting ring sleeve 22 are both closed ends. The gas guiding branch pipe group 23 is detachably connected to the gas collecting ring sleeve 22 and is arranged at intervals along the circumference of the gas collecting ring sleeve 22. The inner cavity of the gas guiding branch pipe group 23 is connected to the inner cavity of the gas collecting ring sleeve 22. The gas guiding branch pipe group 23 is a plurality of extension pipes connected in sequence. The end of the gas guiding branch pipe group 23 away from the gas collecting ring sleeve 22 is detachably provided with a gas collecting piece 24. The gas collecting pieces 24 connected to the plurality of gas guiding branch pipe groups 23 are at the same height. The gas collecting piece 24 is trumpet-shaped and introduces gas into the gas guiding branch pipe group 23. The extension pipes of the gas guiding main pipe 21 and the gas guiding branch pipe group 23 are hard pipes that can be stably extended.

[0067] The hose assembly 40 includes a first hose 41 and a second hose 42. One end of the first hose 41 is detachably connected to the gas guide main pipe 21, and the other end of the first hose 41 is detachably connected to the collection pipe 50. One end of the second hose 42 is detachably connected to the gas collection control assembly 30, and the other end of the second hose 42 is detachably connected to the collection pipe 50. Specifically, one end of the first hose 41 and one end of the second hose 42 are provided with a connecting ring 43, which is a ring structure, and the inner diameter of the connecting ring 43 is consistent with the outer diameter of the collection pipe 50, and the end of the collection pipe 50 is movably connected to the connecting ring 43.

[0068] A first through hole 211 is formed on a side wall of the air guide main pipe 21 near the bottom end. A connecting port 212 is fixedly connected to the first through hole 211 . The connecting port 212 is connected to one end of the first hose 41 .

[0069] The fixing assembly 10 includes a bottom plate 11 and a mounting tube 12 vertically fixed on the bottom plate 11, and the bottom end of the air guide tube 21 is movably connected in the mounting tube 12. A through groove 121 is axially formed on the side wall of the mounting tube 12, and the connection port 212 is penetrated in the through groove 121.

[0070] The gas collection assembly 20 further includes a first pipe connector 25, through which the gas collection ring 22 and the gas guide branch pipe group 23 are connected. Specifically, the first pipe connector 25 is an intermediate transition portion 251 and connecting columns 252 located on both sides of the intermediate transition portion 251. The gas collection ring 22 is provided with second through holes 221 spaced apart along its circumference, one of the connecting columns 252 of the first pipe connector 25 is connected to the second through hole 221, and the other connecting column 252 of the first pipe connector 25 is connected to the gas guide branch pipe group 23.

[0071] The various components of the gas collecting assembly 20 are made of materials with good corrosion resistance, such as polypropylene, polytetrafluoroethylene, and stainless steel, and have good corrosion resistance to different types of gas components.

[0072] The bottom end of the gas guide main pipe 21 is a closed end. The gas guide main pipe 21 is a straight pipe that runs through from top to bottom, and a bottom cover is provided at the bottom end of the gas guide main pipe 21. The bottom cover can be integrally connected to the gas guide main pipe 21, or the bottom cover can be separately connected to the gas guide main pipe 21. The gas guide main pipe 21 can also be a straight pipe with an open top and a closed bottom, without the need for a bottom cover.

[0073] The top of the gas collection ring 22 is a closed end. The gas collection ring 22 is a straight tube that passes through from top to bottom. A top cover is provided at the top of the gas collection ring 22. The top cover can be integrally connected to the gas collection ring 22, or the top cover can be separately connected to the gas collection ring 22. The gas collection ring 22 can also be a straight tube with an open top and a closed bottom, without the need for a top cover.

[0074] The gas guide main pipe 21 is connected to the gas collection ring sleeve 22 through a clamp 27; a first convex ring 213 is provided at the top of the outer surface of the gas guide main pipe 21, and a second convex ring 222 is provided at the bottom of the outer surface of the gas collection ring sleeve 22. The outer diameters of the first convex ring 213 and the second convex ring 222 are equal. A limiting groove 271 is provided at the middle position of the inner surface of the clamp 27, and the limiting groove 271 is adapted to the first convex ring 213 and the second convex ring 222; a first convex body 214 is provided at the upper end of the gas guide main pipe 21. When the gas guide main pipe 21 and the gas collection ring sleeve 22 are in a connected state, the first convex body 214 is embedded in the gas collection ring sleeve 22, and the clamp 27 connects and fixes the first convex ring 213 and the second convex ring 222. The gas guide main pipe 21 and the gas collection ring sleeve 22 can also be connected by threads.

[0075] The extension tubes constituting the gas guide branch tube group 23 have the same diameter. When multiple extension tubes are connected, adjacent extension tubes are connected via a second tube connector 26 , and the structure of the second tube connector 26 is the same as that of the first tube connector 25 .

[0076] The extension tubes can be plugged and connected to each other, and the length can be increased or decreased as needed, which is convenient for adjustment and expansion. It should be noted that the embodiment of the present invention does not limit the number of extension tubes of the same gas branch tube group 23, and the number of extension tubes of different gas branch tube groups 23 can be the same or different. Therefore, the embodiment of the present invention does not limit this. Since this is not the focus of the embodiment of the present invention, it will not be repeated here.

[0077] The gas collection control assembly 30 includes an upper shell 31 and a lower shell 32, and the upper shell 31 is hingedly connected to the lower shell 32; the upper shell 31 is provided with a power switch 33, a gas flow rate control knob 34, a gas collection volume control knob 35 and a display screen 36, and the inner cavity of the lower shell 32 is provided with an electric pump 37, a controller 38, a solenoid valve 39, a flow rate control valve 310 and a battery 311, and the controller 38 is electrically connected to the power switch 33, the gas flow rate control knob 34, the gas collection volume control knob 35, the display screen 36, the electric pump 37, the solenoid valve 39, the flow rate control valve 310 and the battery 311 respectively. The side wall of the lower shell 32 is provided with an air inlet 312 and an exhaust port 313, and the air inlet 312, the flow rate control valve 310, the solenoid valve 39, the electric pump 37 and the exhaust port 313 are connected in sequence through pipelines. The end of the second hose 42 is detachably connected to the air inlet 312. The electric pump 37 provides power for collecting gas. The gas collection volume control knob 35 cooperates with the solenoid valve 39 to control the opening and closing status of the gas collection channel and the gas collection volume. The flow rate control valve 310 cooperates with the gas flow rate control knob 34 to adjust the gas flow rate. The display screen 36 displays the set gas collection volume and gas flow rate so that the operator can obtain information, accurately collect gas, and ensure that the set requirements of the test are met.

[0078] In order to prevent dust particles in the room from being collected into the collection pipe 50 during the gas collection process, a dustproof mesh cover 60 is provided on the outer side of the gas collecting member 24, as shown in FIG. 13 .

[0079] In order to prevent the moisture in the room from being collected into the collection tube 50 during the gas collection process, a drying tube 70 is provided in the middle of the first hose 41. Before the gas enters the collection tube 50, the gas is dehumidified in the drying tube 70 to ensure that the gas collected in the collection tube 50 is dry gas, thereby avoiding affecting the detection.

[0080] The fixing assembly 10 also includes adjustment support legs 13 arranged at the four corners of the bottom surface of the base plate 11 and a horizontal bubble meter 14 arranged on the top surface of the base plate 11. The adjustment support legs 13 and the horizontal bubble meter 14 are used to level the entire multi-point gas collection device to ensure that the gas collecting parts 24 connected to the multiple gas branch pipe groups 23 are at the same height position.

[0081] When the multi-point gas collection device is used, the various components of the multi-point gas collection device are assembled and installed first. The fixing assembly 10 is placed on the floor of the room, the bottom end of the gas guide main pipe 21 is installed on the fixing assembly 10, the gas collection ring sleeve 22 is connected to the top of the gas guide main pipe 21 through the clamp 27, and then the gas guide branch pipe group 23 is connected to the side wall of the gas collection ring sleeve 22. The number of extension pipes to be used is determined according to the length of the gas guide branch pipe group 23, and the gas collection piece 24 is connected to the last extension pipe. One end of the first hose 41 is connected to the connection port 212 at the bottom of the gas guide main pipe 21, the end of the second hose 42 is connected to the air inlet 312, and the two ends of the collection pipe 50 are connected to the connection ring sleeve 43. The operator turns on the power switch 33, operates the gas flow rate control knob 34 and the gas collection volume control knob 35, and adjusts the gas flow rate and gas collection volume displayed on the display screen 36 to the set requirements to collect gas. After the gas collection reaches the set requirements, the collection tube 50 is removed from the connecting ring sleeve 43, and then the various components of the multi-point gas collection device are disassembled to complete the gas collection work. The collection tube 50 is connected to the analysis instrument to further analyze the gas concentration.

[0082] The multi-point gas collection device replaces the existing manual multi-point gas collection method. The device replaces the existing manual multi-point gas collection method, realizes multi-point gas collection, improves production efficiency, saves labor, and also reduces the problem of uneven gas collection in manual gas collection, reduces experimental errors, and the device is detachable for easy movement.

[0083] Embodiment 2:

[0084] The technical solution of Example 2 is specifically described in conjunction with Figures 14 to 16. The difference from Example 1 is that at least one extension tube 28 is further provided between the gas guide main pipe 21 and the gas collection ring sleeve 22. The extension tube 28 and the gas guide main pipe 21, the extension tube 28 and the gas collection ring sleeve 22, and adjacent extension tubes 28 are connected by a clamp 27; the top end of the outer surface of the extension tube 28 is provided with a third convex ring 281, and the bottom end of the outer surface of the extension tube 28 is provided with a fourth convex ring 282. The third convex ring 281 and the fourth convex ring 282 are connected to each other. 2 is equal to the outer diameter of the first convex ring 213; the upper end of the extension tube 28 is provided with a second convex body 283, when the extension tube 28 is in a connected state with the gas collection ring sleeve 22, the second convex body 283 is embedded in the gas collection ring sleeve 22, when the adjacent extension tubes 28 are in a connected state, the second convex body 283 of the lower extension tube 28 is embedded in the upper extension tube 28, when the extension tube 28 is in a connected state with the gas guide main pipe 21, the first convex body 214 of the gas guide main pipe 21 is embedded in the extension tube 28. The other parts are exactly the same as those in Example 1.

[0085] A.2.4 in the national standard GB 18883-2022 "Indoor Air Quality Standard" states: "In principle, it should be consistent with the breathing zone height of adults, and the relative height should be between 0.5m and 1.5m. If conditions permit, consider the breathing height in the sitting and lying states and the height of children, and increase the sampling at a relative height of 0.3m to 0.6m." In this embodiment, the number of extension tubes 28 can be adjusted according to actual needs to achieve height adjustment of the gas collecting component 24 to meet the requirements of different sampling heights.

[0086] Embodiment 3:

[0087] In order to prevent the length of the gas guide branch pipe group 23 from being too long, the extension pipe close to the gas collecting piece 24 is bent downward due to gravity, causing the gas collecting piece 24 to deviate from the set gas collection height, a technical solution of Example 3 is provided, and the technical solution of Example 3 is specifically described in conjunction with Figures 17 to 19. The difference between this embodiment and Example 1 is that the diameter of the extension pipe of the gas guide branch pipe group 23 toward the gas collecting piece 24 is reduced successively, the adjacent extension pipes are connected by threads, and the last extension pipe away from the gas collection ring sleeve 22 is connected to the gas collecting piece 24 through a reducing connector 29. The reducing connector 29 includes a sizing pipe 291, a connecting portion 292 and a reducing pipe 293 that are interconnected. The sizing pipe 291 is detachably connected to the gas collecting piece 24, and the sizing pipe 291 is connected to the gas collecting piece 24. The connecting portion 292 is integrally formed between the sizing pipe 291 and the reducing pipe 293, and is used to connect the sizing pipe 291 and the reducing pipe 293. The diameter of the reducer 293 gradually decreases from an end close to the connection portion 292 to an end away from the connection portion 292 , and the last section of the extension pipe away from the gas collecting ring sleeve 22 is tightly sleeved on the reducer 293 .

[0088] Furthermore, three annular sealing rings 294 are fixed on the outer wall of the reducer 293, and the diameters of the three annular sealing rings 294 increase successively, and the three annular sealing rings 294 are evenly arranged along the axial direction of the reducer 293. When the extension tube is tightly sleeved on the reducer 293, the extension tube can be covered on one of the annular sealing rings 294, and the annular sealing ring 294 can further enhance the tightness of the connection between the extension tube and the reducer 293. The reducer connector 29 can adapt to extension tubes of different diameters to meet the use of different numbers of gas guide branch tube groups 23. The closer the extension tube is to the gas collecting part 24, the smaller the diameter is, which solves the problem that the extension tube close to the gas collecting part 24 bends downward due to gravity, causing the gas collecting part 24 to deviate from the set gas collection height.

[0089] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "bottom", "top", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0090] The terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features.

[0091] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A multi-point gas collection device, characterized in that: include: A gas collecting assembly (20) is used for guiding gas; the gas collecting assembly (20) comprises a gas guiding main pipe (21) whose bottom end is movably connected to a fixed assembly (10), a gas collecting ring sleeve (22) movably connected to the top of the gas guiding main pipe (21), and a plurality of gas guiding branch pipe groups (23); the bottom end of the gas guiding main pipe (21) and the top of the gas collecting ring sleeve (22) are both closed ends; the gas guiding branch pipe groups (23) are detachably connected to the gas collecting ring sleeve (22) and are arranged at intervals along the circumference of the gas collecting ring sleeve (22); the inner cavity of the gas guiding branch pipe group (23) is in communication with the inner cavity of the gas collecting ring sleeve (22); the gas guiding branch pipe group (23) is a plurality of sequentially connected extension pipes; the end of the gas guiding branch pipe group (23) away from the gas collecting ring sleeve (22) is detachable. A gas collecting member (24) is arranged on the ground, and the gas collecting members (24) connected to the plurality of gas branch pipe groups (23) are at the same height position; the gas collecting assembly (20) further comprises a first pipe connecting member (25), and the gas collecting ring sleeve (22) and the gas branch pipe group (23) are connected via the first pipe connecting member (25); the first pipe connecting member (25) comprises an intermediate transition portion (251) and connecting columns (252) located on both sides of the intermediate transition portion (251); the gas collecting ring sleeve (22) is provided with second through holes (221) at intervals along its circumference, one of the connecting columns (252) of the first pipe connecting member (25) is connected to the second through hole (221), and the other connecting column (252) of the first pipe connecting member (25) is connected to the gas branch pipe group (23); A gas collection control component (30) is used to control the gas flow rate and sampling time during the gas collection process; A hose assembly (40) is used to connect the gas collection assembly (20) and the gas collection control assembly (30) and guide the gas; the hose assembly (40) comprises a first hose (41) and a second hose (42); one end of the first hose (41) is detachably connected to the gas guide main pipe (21), the other end of the first hose (41) is detachably connected to the collection pipe (50), one end of the second hose (42) is detachably connected to the gas collection control assembly (30), and the other end of the second hose (42) is detachably connected to the collection pipe (50); A collection tube (50) is detachably connected in the middle of the hose assembly (40), and the collection tube (50) is used to collect gas; the hose assembly (40) is in communication with the inside of the gas collection assembly (20) and the collection tube (50), respectively; and a fixing assembly (10) for supporting the gas collection assembly (20) and accommodating the gas collection control assembly (30).

2. The multi-point gas collection device according to claim 1, characterized in that: The gas guide main pipe (21) is connected to the gas collecting ring sleeve (22) via a clamp (27); A first convex ring (213) is provided at the top of the outer surface of the gas guide main pipe (21), a second convex ring (222) is provided at the bottom of the outer surface of the gas collection ring sleeve (22), the outer diameters of the first convex ring (213) and the second convex ring (222) are equal, a limiting groove (271) is provided at the center of the inner surface of the clamp (27), and the limiting groove (271) is adapted to the first convex ring (213) and the second convex ring (222); A first convex body (214) is provided at the upper end of the gas guide main pipe (21); when the gas guide main pipe (21) and the gas collection ring sleeve (22) are in a connected state, the first convex body (214) is embedded in the gas collection ring sleeve (22).

3. The multi-point gas collection device according to claim 2, characterized in that: At least one extension pipe (28) is further provided between the gas guide main pipe (21) and the gas collection ring sleeve (22); the extension pipe (28) and the gas guide main pipe (21), the extension pipe (28) and the gas collection ring sleeve (22), and adjacent extension pipes (28) are connected via clamps (27); A third convex ring (281) is provided at the top end of the outer surface of the extension tube (28), and a fourth convex ring (282) is provided at the bottom end of the outer surface of the extension tube (28); the outer diameters of the third convex ring (281) and the fourth convex ring (282) are equal to the outer diameter of the first convex ring (213); A second protrusion (283) is provided at the upper end of the extension tube (28); when the extension tube (28) and the gas collecting ring sleeve (22) are in a connected state, the second protrusion (283) is embedded in the gas collecting ring sleeve (22); when the adjacent extension tubes (28) are in a connected state, the second protrusion (283) of the lower extension tube (28) is embedded in the upper extension tube (28); when the extension tube (28) and the gas guiding main pipe (21) are in a connected state, the first protrusion (214) of the gas guiding main pipe (21) is embedded in the extension tube (28).

4. The multi-point gas collection device according to claim 1, characterized in that: The extension tubes constituting the gas guide branch tube group (23) have the same diameter; Adjacent extension pipes are connected via a second pipe connector (26), and the structure of the second pipe connector (26) is the same as that of the first pipe connector (25).

5. The multi-point gas collection device according to claim 1, characterized in that: The diameters of the extension pipes of the gas guide branch pipe group (23) that are directed toward the gas collecting member (24) are successively reduced, and adjacent extension pipes are connected by threads, and the last extension pipe away from the gas collecting ring sleeve (22) is connected to the gas collecting member (24) by a reducing connector (29); The reducer connector (29) comprises a calibrating tube (291), a connecting portion (292) and a reducer (293) which are interconnected; the calibrating tube (291) is detachably connected to the gas collecting member (24), and the calibrating tube (291) is in communication with the gas collecting member (24); the connecting portion (292) is integrally formed between the calibrating tube (291) and the reducer (293), and is used to connect the calibrating tube (291) and the reducer (293); the diameter of the reducer (293) gradually decreases from an end close to the connecting portion (292) to an end away from the connecting portion (292), and the last section of the extension tube away from the gas collecting ring sleeve (22) is tightly sleeved on the reducer (293).

6. The multi-point gas collection device according to claim 5, characterized in that: Three annular sealing rings (294) are fixed on the outer wall of the reducer (293), the diameters of the three annular sealing rings (294) increase in sequence, and the three annular sealing rings (294) are evenly arranged along the axial direction of the reducer (293); When the extension tube is tightly sleeved onto the reducer (293), the extension tube is covered on one of the annular sealing rings (294).

7. The multi-point gas collection device according to claim 1, characterized in that: One end of the first hose (41) and one end of the second hose (42) are provided with a connecting ring (43); the inner diameter of the connecting ring (43) is consistent with the outer diameter of the collection tube (50); and the end of the collection tube (50) is movably connected to the connecting ring (43).

8. The multi-point gas collection device according to claim 1, characterized in that: The gas collection control assembly (30) comprises an upper shell (31) and a lower shell (32), wherein the upper shell (31) and the lower shell (32) are hingedly connected; The upper shell (31) is provided with a power switch (33), a knob for controlling the gas flow rate (34), a knob for controlling the gas collection amount (35), and a display screen (36); an electric pump (37), a controller (38), a solenoid valve (39), a flow rate control valve (310), and a battery (311) are provided in the internal cavity of the lower shell (32); the controller (38) is electrically connected to the power switch (33), the knob for controlling the gas flow rate (34), the knob for controlling the gas collection amount (35), the display screen (36), the electric pump (37), the solenoid valve (39), the flow rate control valve, and the battery (311), respectively; An air inlet (312) and an air outlet (313) are provided on the side wall of the lower housing (32); the air inlet (312), the flow rate control valve (310), the solenoid valve (39), the electric pump (37) and the air outlet (313) are connected in sequence via pipelines; and the end of the second hose (42) is detachably connected to the air inlet (312).

9. The multi-point gas collection device according to claim 1, characterized in that: A dustproof mesh cover (60) is provided on the outer side of the gas collecting member (24); A drying pipe (70) is provided in the middle of the first hose (41).

10. The multi-point gas collection device according to claim 1, characterized in that: The fixing assembly (10) comprises a base plate (11) and a mounting tube (12) vertically fixedly disposed on the base plate (11), and the bottom end of the air guide main pipe (21) is movably connected in the mounting tube (12); The fixing assembly (10) further comprises adjustable support legs (13) arranged at the four corners of the bottom surface of the bottom plate (11) and a level bubble gauge (14) arranged on the top surface of the bottom plate (11).

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