Gas sampling device

Abstract

The utility model relates to the technical field of gas sampling, in particular to a gas sampling device. The gas sampling device comprises an outer cylinder, a cylinder cover and a sealing cylinder, the outer cylinder sleeves the periphery of the cylinder cover, the cylinder cover can extend out of the top opening of the outer cylinder, the extending height is adjustable, and the opening of the cylinder cover faces the bottom opening of the outer cylinder; the top of the sealing cylinder is connected with the inner side wall of the cylinder cover, and the bottom of the sealing cylinder is connected with the inner side wall of the outer cylinder so as to seal a gap between the outer cylinder and the cylinder cover; the sealing cylinder is arranged to stretch out and draw back along with the height change of the cylinder cover. In the scheme, by adjusting the height of the cylinder cover extending out of the outer cylinder, accommodating spaces with different heights can be formed among the cylinder cover, the sealing cylinder and the outer cylinder, and closed spaces with different heights can also be formed among the cylinder cover, the sealing cylinder, the outer cylinder and the ground, so that the gas sampling device can be used for sampling plants with different heights; and the application range of the applicable gas sampling device is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of gas sampling, in particular to a gas sampling device. Background Art

[0002] When investigating and studying the carbon and nitrogen cycle in field wetlands, it is necessary to collect gases such as methane, carbon dioxide, and nitrous oxide in the wetland system. To sample gases in a wetland system, a gas sampling device must be completely placed over the wetland plants, enclosing the entire wetland system above ground, including the plants. The gas within the device is then sampled over a predetermined period of time.

[0003] However, existing gas sampling devices are typically of a fixed height and are only suitable for sampling gases in a single scenario, in a wetland system planted with plants of a certain fixed height. When gas sampling is required in a wetland system planted with plants of different types and heights, the varying heights of the plants in the wetland system itself will limit the use of the gas sampling device. In particular, when the height of the plants exceeds the height of the gas sampling device, a taller gas sampling device must be replaced, which will cause inconvenience to the gas sampling work. Utility Model Content

[0004] The utility model provides a gas sampling device with adjustable height.

[0005] The above-mentioned gas sampling device includes an outer tube, a tube cover and a sealing tube; the outer tube is sleeved on the outer circumference of the tube cover, the tube cover can be extended from the top opening of the outer tube and the extension height is adjustable, and the opening of the tube cover is open to the bottom of the outer tube; the top of the sealing tube is connected to the inner side wall of the tube cover, and the bottom of the sealing tube is connected to the inner side wall of the outer tube to seal the gap between the outer tube and the tube cover; the sealing tube is configured to expand and contract as the height of the tube cover changes.

[0006] Optionally, the height of the barrel cover is adjusted by a height adjustment structure, which includes a mounting groove, an elastic member, a limit block and multiple positioning holes; the mounting groove is arranged on the side wall of the barrel cover and is recessed toward the inner side of the barrel cover; the limit block is installed in the mounting groove, and the limit block is arranged to be movable along the depth direction of the mounting groove; the elastic member is located between the limit block and the bottom of the mounting groove; the positioning holes are arranged on the side wall of the outer cylinder, and all the positioning holes are spaced apart along the height direction of the outer cylinder; the elastic member applies an elastic force toward the outer cylinder to the limit block so that the end of the limit block can be movably inserted into any positioning hole; and when the end of the limit block is inserted into the positioning holes at different heights, the barrel cover is adjusted to different heights.

[0007] Optionally, a slide groove is provided on the side wall of the installation groove, the slide groove extends along the depth direction of the installation groove, and a slider is provided on the limit block; the slider can move along the slide groove so that the limit block can move along the depth direction of the installation groove.

[0008] Optionally, the outer side of the positioning hole is covered with a sealing film, and the sealing film is elastic.

[0009] Optionally, the end surface of the limiting block facing the outer cylinder is set to be a spherical surface; a sliding groove is provided between each two adjacent positioning holes, and the end of the limiting block can move between the two adjacent positioning holes along the sliding groove.

[0010] Optionally, the cross-sectional size of the middle portion of the limiting block is larger than the aperture of the positioning hole.

[0011] Optionally, a first flange is provided along the top edge of the outer cylinder, and a free end of the first flange points toward the cylinder cover and extends obliquely upward.

[0012] Optionally, a second flange is provided along the bottom edge of the cylinder cover, and the free end of the first flange points toward the outer cylinder.

[0013] Optionally, a base plate is provided around the bottom of the outer cylinder, and a plurality of insertion holes are provided at intervals in the circumferential direction on the base plate, and insertion rods are movably inserted into the insertion holes.

[0014] Optionally, a fan is provided on the inner side of the top of the cylinder cover, and the fan is used to blow the gas in the cylinder cover and the outer cylinder so that the various gas components inside are evenly distributed.

[0015] The technical solution provided by the embodiment of the utility model has the following advantages compared with the prior art:

[0016] By adjusting the height of the tube cover extending out of the outer tube, accommodating spaces of different heights can be formed between the tube cover, the sealing tube and the outer tube, and closed spaces of different heights can also be formed between the tube cover, the sealing tube, the outer tube and the ground, so that the gas sampling device can sample plants at different heights, thereby enhancing the applicability of the gas sampling device; and the sealing tube can also isolate the gap between the outer tube and the tube cover from the accommodating space (or closed space), so that the accommodating space (or closed space) is better sealed, which also helps to ensure the accuracy of gas sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic diagram of a gas sampling device in one embodiment of the present invention;

[0020] Figure 2 It is a partial schematic diagram of the height adjustment structure in one embodiment of the present utility model.

[0021] Among them, 1. outer cylinder; 2. cylinder cover; 3. sealing cylinder; 4. mounting groove; 5. elastic part; 6. limit block; 7. positioning hole; 8. sealing film; 9. first flange; 10. second flange; 11. sampling tube; 12. fan; 13. base plate; 14. insertion rod; 15. slider; 16. stop plate. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] like Figure 1 As shown, the utility model provides a gas sampling device, which includes an outer tube 1, a tube cover 2 and a sealing tube 3. The outer tube 1 is sleeved on the outer periphery of the tube cover 2, and the tube cover 2 can extend from the top opening of the outer tube 1, and the height at which the tube cover 2 extends can be adjusted. The opening of the tube cover 2 is toward the bottom opening of the outer tube 1, that is, the tube cover 2 is open downward. The top of the sealing tube 3 is connected to the inner side wall of the tube cover 2, and the bottom of the sealing tube 3 is connected to the inner side wall of the outer tube 1 to seal the gap between the outer tube 1 and the tube cover 2. The sealing tube 3 is configured to expand and contract as the height of the tube cover 2 changes.

[0025] In this embodiment, the outer tube 1 is configured as a cylindrical component having a top opening and a bottom opening that are interconnected. The outer tube 1 can be placed directly on the ground, while the tube cover 2 is supported by the outer tube 1 to stand on the ground. Therefore, the outer tube 1 must have high stability, that is, it is not easy to fall over. For example, the outer tube 1 is not easily blown over by the wind, or it is not easily affected by surrounding vibrations and fall over. In addition, even when the height of the tube cover 2 is adjusted to the highest level, the outer tube 1 must also have high stability to ensure that the center of the entire device is still at a low position, thereby making the gas sampling device not easy to fall over. Therefore, the outer tube 1 should have a large weight. Of course, there are many ways to increase the weight of the outer tube 1. For example, the material of the outer tube 1 can be made of a high-density metal material such as stainless steel, or the wall thickness of the outer tube 1 can be increased. The present utility model will not list them one by one. A number of handles can also be provided on the outside of the outer tube 1 for the convenience of the experimenter.

[0026] In the present embodiment, the barrel cover 2 includes a top wall and a side wall. Specifically, the top of the barrel cover 2 is sealed, and the bottom of the barrel cover 2 has a downward opening, which allows plants to extend into the internal space of the barrel cover 2. Taking into account that plants may also need to perform photosynthesis during the sampling period, the top of the barrel cover 2 should be made of a light-transmitting material so that the plants located in the barrel cover 2 can also receive sunlight. Of course, the material of the barrel cover 2 can be made of some light and non-destructive materials, such as plastic, to reduce the mass of the gas sampling device as much as possible and increase portability.

[0027] In the present embodiment, sealing cylinder 3 has the top opening and bottom opening that are interconnected.The top of sealing cylinder 3 is connected with the inner side wall of cylinder cover 2, and the bottom of sealing cylinder 3 is connected (concretely, the bottom of sealing cylinder 3 and the connection position of cylinder cover 1 are positioned at the below of cylinder cover 2) with the inner side wall of ursinus 1, makes to be communicated between cylinder cover 2, sealing cylinder 3 and ursinus 1, and three forms an accommodating space with opening downwards, and this space can hold plant to be measured.And owing to there is gap between ursinus 1 sidewall and cylinder cover 2 sidewalls, sealing cylinder 3 can seal this gap, makes accommodating space can be isolated with gap.So when ursinus 1 was installed on ground, can form the good sealed space of closure between cylinder cover 2, sealing cylinder 3, ursinus 1 and the surface, can effectively prevent the gas in the sealed space from leaking.In addition, sealing cylinder 3 can realize retractability by multiple structure.For example, the sidewall of sealing cylinder 3 is arranged to retractable corrugated structure.For example, sealing cylinder 3 is made by the rubber material with certain elasticity and flexibility. For another example, the sealing cylinder 3 is provided with a plurality of annular bending portions distributed at vertical intervals, and the thickness at the bending portion is less than the thickness of the non-bending portion, so that two adjacent non-bending portions are easy to fold or unfold, thereby realizing the telescopic movement of the sealing cylinder 3. Of course, the sealing cylinder 3 can also be telescopically realized by other technical solutions, which are no longer listed in detail in the present utility model. In addition, in some preferred embodiments, a detachable connection can be adopted between the sealing cylinder 3 and the outer cylinder 1, and a detachable connection can also be adopted between the sealing cylinder 3 and the tube cover 2, so that the gas sampling device is convenient to clean and maintain. For example, the inner side of the tube wall of the outer cylinder 1 and the inner side of the tube wall of the tube cover 2 are both provided with a circle of draw-in grooves, which are recessed back to the sealing cylinder, and a circle of elastic connecting rings are provided along the bottom edge and the top edge of the sealing cylinder 3, which can be embedded in the corresponding draw-in grooves and clamped by the draw-in grooves; when the sealing cylinder 3 needs to be removed, the connecting rings are detached from the corresponding draw-in grooves.

[0028] In the present embodiment, when treating a certain plant sampling, barrel cover 2 is adjusted to suitable height, then gas sampling device cover plant to be measured is covered, plant to be measured is positioned in the accommodating space between barrel cover 2, sealing cylinder 3 and outer cylinder 1.So by adjusting the height that barrel cover 2 stretches out outer cylinder 1, accommodating space of different heights can be formed between barrel cover 2, sealing cylinder 3 and outer cylinder 1, and also can form enclosed space of different heights between barrel cover 2, sealing cylinder 3, outer cylinder 1 and the ground, and then make this gas sampling device can sample plant of different heights, enhance the scope of application of applicability gas sampling device.And sealing cylinder 3 can also isolate the gap between outer cylinder 1 and barrel cover 2 from accommodating space (or enclosed space), make the sealing property of accommodating space (or enclosed space) better, also contribute to guarantee the accuracy of gas sampling.

[0029] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the height of the barrel cover 2 is adjusted by a height adjustment structure. The height adjustment structure includes a mounting groove 4, an elastic member 5, a limit block 6 and a plurality of positioning holes 7. The mounting groove 4 is arranged on the side wall of the barrel cover 2 and is recessed toward the inner side of the barrel cover 2, that is, the opening of the mounting groove 4 faces the side wall of the outer barrel 1. The limit block 6 is movably installed in the mounting groove 4, and the limit block 6 can move along the depth direction of the mounting groove 4, that is, the limit block 6 can move along the direction toward or away from the side wall of the outer barrel 1. The elastic member 5 is arranged between the limit block 6 and the bottom of the mounting groove 4. The elastic member 5 can be a component with excellent elasticity such as a spring or a rubber block, and the utility model does not impose any restrictions. When the elastic member 5 is a spring or a rubber block, the elastic member 5 is preset to a compressed state, so that the elastic member 5 is always in a state of pushing the limit block 6. The positioning holes 7 are arranged on the side wall of the outer barrel 1, and all the positioning holes 7 are spaced apart along the height direction of the outer barrel 1. For example, the positioning holes 7 can be spaced apart along the vertical direction. The end of the limiting block 6 can be movably inserted into any positioning hole 7 .

[0030] In the present embodiment, when the end of the limit block 6 is inserted into the positioning holes 7 at different heights, the barrel cover 2 is adjusted to different heights. Specifically, when the barrel cover 2 is at a certain height, the limit block 6 is inserted into a positioning hole 7. When adjusting the height of the barrel cover 2, the free end of the limit block 6 is pushed, and the limit block 6 is retracted into the mounting groove 4 until the limit block 6 is disengaged from the positioning hole 7. The positioning state of the barrel cover 2 is released and the height can be adjusted. In the process of adjusting the height of the barrel cover 2, the limit block 6 will move between the positioning holes 7 at different heights, and the limit block 6 is pressed against the inner side of the outer cylinder 1 by the elastic force of the elastic member 5. When the height of the barrel cover 2 is adjusted to the target height, the limit block 6 pops up and is inserted into the new positioning hole 7 at the corresponding height. At this time, the barrel cover 2 is in a positioning state and is positioned at the target height. In addition, it will be understood by those skilled in the art that the cross-sectional dimensions of the barrel of the barrel cover 2 should be close to the cross-sectional dimensions of the outer barrel 1, so as to reduce the gap between the two on the one hand; on the other hand, it is to limit the side of the barrel cover 2 where the limit block 6 is not installed from tilting significantly (i.e., the top of the side of the outer barrel 1 where the positioning hole 7 is not provided will support the barrel cover 2), thereby ensuring the stability of the barrel cover 2. Of course, there can also be multiple height adjustment structures. When multiple height adjustment structures are provided, all height adjustment structures are preferably distributed at intervals along the circumference of the outer barrel 1 so that the barrel cover 2 is not easy to shake.

[0031] In some other embodiments, the height of the barrel cover 2 can also be adjusted in a variety of ways. For example, the inner side of the outer barrel 1 is provided with an internal thread, and the outer side of the barrel cover 2 is provided with an external thread, and the height of the inner barrel is adjusted by rotating the outer barrel 1 or the inner barrel. For example, a plurality of screw holes are provided on the barrel wall of the outer barrel 1, and screws are installed in the screw holes; after the height of the inner barrel is adjusted, the screws are tightened until the screws press against the outer wall of the inner barrel. For another example, some wedge nails are provided between the gap between the outer barrel 1 and the barrel cover 2, so that the barrel cover 2 can be clamped; when the height adjustment of the barrel cover 2 is completed, the wedge nails are inserted into the gap, and the height of the barrel cover 2 is fixed. For other height adjustment schemes, the utility model will not go into details one by one.

[0032] In some embodiments of the present invention, Figure 2 As shown, a chute is provided on the side wall of the mounting groove 4, and the chute extends along the depth direction of the mounting groove 4. A slider 15 is provided on the limit block 6. The slider 15 can move along the chute so that the limit block 6 can move along the depth direction of the mounting groove 4. Through the cooperation of the slider 15 and the chute, the limit block 6 is limited to moving only along the depth direction of the mounting groove 4, thereby preventing the limit block 6 from rotating circumferentially, thereby avoiding affecting the smoothness of the barrel cover 2 during the telescopic process. A stop plate 16 can also be provided at the end of the chute (i.e., the end of the chute facing the opening of the mounting groove 4), and the stop plate 16 is used to prevent the slider 15 from detaching from the chute.

[0033] In some embodiments of the present invention, Figure 2As shown, the outer side of the positioning hole 7 is covered with a sealing membrane 8, which is elastic. The sealing membrane 8 is preferably made of rubber. The sealing membrane 8 prevents contaminants such as water and dust from entering the gap between the outer cylinder 1 and the cylinder cover 2 through the positioning hole 7. In addition, due to the certain elasticity of the sealing membrane 8, the sealing membrane 8 will not be punctured when the stop block 6 is inserted into the positioning hole 7.

[0034] In some embodiments of the present invention, Figure 2 As shown, the end surface of the stopper 6 facing the outer cylinder 1 is configured as a spherical surface, that is, the end surface of the free end of the stopper 6 is configured as a spherical surface, thereby reducing the friction force when the stopper 6 moves along the inner sidewall of the outer cylinder 1. A chute is provided between each two adjacent positioning holes 7, and the end of the stopper 6 can move along the chute between the two adjacent positioning holes 7. The chute serves as a moving track for the stopper 6, allowing the stopper 6 to move only in a straight line, thus preventing the stopper 6 from deviating when moving between the two positioning holes 7. Of course, the chute can be a U-shaped chute to facilitate matching with the free end surface of the stopper 6.

[0035] In some embodiments of the present invention, Figure 2 As shown, the cross-sectional dimensions of the middle portion of the stopper 6 are larger than the diameter of the positioning hole 7. Specifically, the cross-sectional dimensions of the free end of the stopper 6 are smaller than the diameter of the positioning hole 7, so that the free end of the stopper 6 can be smoothly inserted into the positioning hole 7, while the middle portion of the stopper 6 is constrained inside the outer cylinder 1 and cannot be inserted into the positioning hole 7, thereby preventing the stopper 6 from falling out through the positioning hole 7.

[0036] In some embodiments of the present invention, Figure 1 As shown, a first flange 9 is provided along the top edge of the outer cylinder 1, and the free end of the first flange 9 points to the cylinder cover 2 and extends upward at an angle. The first flange 9 is used to prevent water or dust from entering the gap between the outer cylinder 1 and the cylinder cover 2. Specifically, the first flange 9 can close the opening of the gap between the outer cylinder 1 and the cylinder cover 2 to a certain extent, and when dust or water drops onto the first flange 9, the dust or water droplets will slide outward along the first flange 9. In addition, the first flange 9 can also be used as a baffle for the limit block 6 to prevent the limit block 6 from detaching from the top of the outer cylinder 1.

[0037] In some embodiments of the present invention, Figure 1As shown, a second flange 10 is provided along the bottom edge of the barrel cover 2, and the free end of the first flange 9 faces the outer barrel 1. The first flange 9 can point to the outer barrel 1 and extend obliquely upward, or it can point to the outer barrel 1 and extend obliquely downward, but the first flange 9 preferably extends horizontally toward the outer barrel 1. On the one hand, the first flange 9 forms a protection for the sealing barrel 3 to prevent the bottom edge of the barrel cover 2 from piercing the sealing barrel 3 downward. On the other hand, if the number of height adjustment structures is small, the gap between the outer barrel 1 and the barrel cover 2 may cause the barrel cover 2 to tip over toward the side where the height adjustment structure is not provided, but the first flange 9 and the second flange 10 can jointly limit the deviation of the barrel cover 2 to prevent the barrel cover 2 from tipping over too much relative to the outer barrel 1. For example, when there is only one height adjustment structure, when the limit block 6 is inserted into the positioning hole 7, the side of the barrel cover 2 where the limit block 6 is not provided will fall to a certain extent, and the barrel cover 2 will tilt toward the side where the positioning hole 7 is not provided. However, after the barrel cover 2 tilts slightly, the first flange 9 is released from the barrel cover 2, and the first flange 9 supports the barrel cover 2 to prevent the increase of the inclination of the barrel cover 2; at the same time, the second flange 10 on the side of the barrel cover 2 with the limit block 6 will press on the side wall of the outer tube 1, which can also prevent the increase of the inclination of the barrel cover 2; so at this time, the first flange 9 and the second flange 10 jointly limit the deviation of the barrel cover 2 to prevent the barrel cover 2 from tipping over too much relative to the outer tube 1.

[0038] In some embodiments of the present invention, Figure 1 As shown, the bottom ring of the outer tube 1 is provided with a base plate 13, and the base plate 13 is preferably fixedly connected to the outer tube 1. The base plate 13 can increase the weight of the outer tube 1. A plurality of sockets are provided at intervals circumferentially on the base plate 13, and a plug rod 14 is movably inserted into the socket. When the outer tube 1 needs to be firmly fixed to the ground, the plug rod 14 can be passed through the socket and inserted into the soil. A handle can also be provided on the top of the plug rod to facilitate the experimenter to perform plugging and unplugging operations. In other embodiments, the base plate 13 and the plug rod 14 may not be provided at the bottom of the outer tube 1, but the bottom edge of the outer tube 1 can be sharpened to facilitate insertion into the soil, and also to a certain extent, the gas sampling device can be more firmly fixed on the ground.

[0039] In some embodiments of the present invention, Figure 1 As shown, a sampling tube 11 is provided on the outside of the top of the barrel cover 2. The sampling tube 11 is connected to the inside of the barrel cover 2, and a sealing cap is detachably installed on the top of the sampling tube 11. When it is necessary to collect a gas sample inside the barrel cover 2, the sealing cap is opened and the sample analysis device is connected to the sampling tube 11.

[0040] In some embodiments of the present invention, Figure 1As shown, a fan 12 is provided on the inner side of the top of the barrel cover 2. The fan 12 can blow the gas within the barrel cover 2, the outer barrel 1, and the sealing barrel 3 (i.e., within the enclosed space) to evenly distribute the gas components within the space and improve the accuracy of sampling. The fan can be powered by an external power supply or a built-in battery, which is not limited by the present invention.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0042] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features of the present invention.

Claims

1. A gas sampling device, characterized in that: It comprises an outer cylinder (1), a cylinder cover (2) and a sealing cylinder (3); The outer cylinder (1) is sleeved on the outer periphery of the cylinder cover (2); the cylinder cover (2) can extend from the top opening of the outer cylinder (1) and the extending height is adjustable; the opening of the cylinder cover (2) opens toward the bottom of the outer cylinder (1); The top of the sealing cylinder (3) is connected to the inner wall of the cylinder cover (2), and the bottom of the sealing cylinder (3) is connected to the inner wall of the outer cylinder (1) to seal the gap between the outer cylinder (1) and the cylinder cover (2); the sealing cylinder (3) is configured to expand and contract as the height of the cylinder cover (2) changes.

2. The gas sampling device according to claim 1, characterized in that The height of the barrel cover (2) is adjusted by a height adjustment structure, and the height adjustment structure comprises a mounting groove (4), an elastic member (5), a limit block (6) and a plurality of positioning holes (7); The mounting groove (4) is provided on the side wall of the barrel cover (2) and is recessed toward the inner side of the barrel cover (2); the limit block (6) is installed in the mounting groove (4), and the limit block (6) is arranged to be movable along the depth direction of the mounting groove (4); the elastic member (5) is located between the limit block (6) and the bottom of the mounting groove (4); the positioning holes (7) are provided on the side wall of the outer barrel (1), and all the positioning holes (7) are distributed at intervals along the height direction of the outer barrel (1); The elastic member (5) applies an elastic force toward the outer cylinder (1) to the limit block (6), so that the end of the limit block (6) can be movably inserted into any of the positioning holes (7); and when the end of the limit block (6) is inserted into the positioning holes (7) at different heights, the cylinder cover (2) is adjusted to different heights.

3. The gas sampling device according to claim 2, characterized in that: A sliding groove is provided on the side wall of the installation groove (4), and the sliding groove extends along the depth direction of the installation groove (4). A slider (15) is provided on the limit block (6); the slider (15) can move along the sliding groove, so that the limit block (6) can move along the depth direction of the installation groove (4).

4. The gas sampling device according to claim 2, characterized in that: The outer side of the positioning hole (7) is covered with a sealing film (8), and the sealing film (8) is elastic.

5. The gas sampling device according to claim 2, characterized in that: The end surface of the limit block (6) facing the outer cylinder (1) is set as a spherical surface; a sliding groove is provided between each two adjacent positioning holes (7), and the end of the limit block (6) can move between the two adjacent positioning holes (7) along the sliding groove.

6. The gas sampling device according to claim 2, characterized in that: The cross-sectional size of the middle portion of the limiting block (6) is larger than the aperture of the positioning hole (7).

7. The gas sampling device according to claim 1 or 2, characterized in that: A first flange (9) is provided along the top edge of the outer cylinder (1), wherein the free end of the first flange (9) points toward the cylinder cover (2) and extends obliquely upward.

8. The gas sampling device according to claim 7, characterized in that: A second flange (10) is provided along the bottom edge of the cylinder cover (2), and the free end of the first flange (9) points toward the outer cylinder (1).

9. The gas sampling device according to claim 1, characterized in that: A base plate (13) is provided around the bottom of the outer cylinder (1), and a plurality of insertion holes are provided at intervals in the circumferential direction on the base plate (13), and insertion rods (14) are movably inserted into the insertion holes.

10. The gas sampling device according to claim 1, characterized in that: A fan (12) is provided on the inner side of the top of the cylinder cover (2), and the fan (12) is used to blow the gas in the cylinder cover (2) and the outer cylinder (1) so that the various gas components inside are evenly distributed.

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