Air sample collection tube

Abstract

The utility model discloses an air sample collection tube which comprises a sampling tube, a sample introduction tube, a first fixing ring, a sample introduction joint, a ring cover and a second fixing ring, the sampling pipe is connected with a plurality of air analysis devices and is connected with an external fan, the sample introduction pipe is arranged in the sampling pipe in a sleeving manner and is positioned at a position close to the sampling joint, the sample introduction pipe is fixed in the sampling pipe through the first fixing ring, and meanwhile, the sampling pipe is indirectly fixed; the sampling pipe and the sampling pipe are communicated through the sampling connector, the sampling pipe is covered with the ring cover, air leakage is prevented, and the ring cover is fixed in the sampling pipe through the second fixing ring. Air enters from the sample inlet pipe and is collected by the sampling pipe, the fan ensures air circulation, the air sample collecting pipe is connected through a bolt and is convenient to mount and dismount, the whole structure is not influenced when the sampling pipe is cleaned, and cleaning work is convenient to carry out.

Description

Technical Field

[0001] The utility model relates to the technical field of air sample collection, and more specifically to an air sample collection tube, which is especially used for providing air samples for a plurality of environmental monitoring devices. Background Art

[0002] Air samples are fluid and changeable. The existence, concentration and distribution of harmful substances in the air are easily affected by meteorological conditions and change. To correctly reflect the degree, scope and dynamic changes of air pollution, air samples must be collected correctly. Otherwise, even if sensitive and accurate analysis methods are used, the measured results cannot represent the true situation of air pollution on site. Therefore, the collection of air samples is a crucial link in the physical and chemical inspection of air.

[0003] An air collection tube is a commonly used air sample collection device. In existing equipment, the inner tube of most air collection tubes is made of polytetrafluoroethylene or glass. Both materials have relatively high production costs. Compared with glass materials, air collection tubes with polytetrafluoroethylene as the inner tube have relatively low production costs, but their inner tubes are more prone to residual pollutants. Although glass materials rarely have residual pollutants, they have high production costs, are more difficult to transport, and are more difficult to remove and clean regularly.

[0004] Therefore, how to provide an air sample collection tube that is easy to disassemble and clean, has low manufacturing cost, and is quick to install and use is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] In view of this, the utility model provides an air sample collection tube, aiming to solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An air sample collection tube, comprising:

[0008] A sampling tube, the sampling tube having a first end and a second end, a plurality of sampling connectors connected to the tube cavity are fixedly connected to the outer wall of the sampling tube, and the plurality of sampling connectors can be connected to a plurality of air analysis devices in a one-to-one correspondence; a connecting tube connected to the tube cavity is vertically fixed near the second end of the sampling tube, and the free end of the connecting tube is connected to the air inlet of an external fan;

[0009] An injection tube, one end of which is inserted into the inner cavity of the sampling tube from the first end of the sampling tube and corresponds to the position between the first end of the sampling tube and the adjacent sampling connector;

[0010] A first fixing ring, wherein the first fixing ring is sleeved on the outer wall of the sample injection tube, and the outer end side is threadedly connected to the inner wall of the sampling tube, and a fastener is threadedly connected on a ring surface of the first fixing ring to fasten the sample injection tube to the sampling tube;

[0011] An injection connector, which is sleeved on the inner end of the injection tube and has an outer wall threadedly connected to the inner wall of the sampling tube;

[0012] A ring cover, wherein the gap of the ring cover is arranged inside the sampling tube and is located between the connecting tube and the second end of the sampling tube;

[0013] A second fixing ring, wherein the outer wall of the second fixing ring is threadedly connected to the inner wall of the sampling tube, and the inner wall of the second fixing ring is tightly fitted to the outer wall of the ring cover.

[0014] The beneficial effect of the above technical solution is that air enters from the sampling tube and enters the sampling tube through the sampling connector. The sampling tube collects the incoming air, and the sampling connector can be connected to multiple air analysis equipment to analyze and detect the collected air; the fan provides power for the sampling tube, which can send air into the sampling tube and flow out from the tail end of the fan to form a circulating airflow; the threaded connection method facilitates the disassembly of the sampling tube and the sampling tube, and is convenient for cleaning the residual dirt in the sampling tube and the sampling tube.

[0015] Preferably, in the above-mentioned air sample collection tube, the first fixing ring includes an annular seat and a semicircular ring connector fixed on an annular surface of the annular seat, the outer end side of the annular seat is threadedly connected to the inner wall of the sampling tube; a side wall of the fastener is provided with a semicircular ring notch corresponding to the radius of the semicircular ring groove of the semicircular ring connector, the end face of the fastener is threadedly connected to the end face of the semicircular ring connector to form an annular connector, and the inner wall of the annular connector is tightly fitted with the outer wall of the injection tube. The annular cavity of the first fixing ring is similar to a pagoda structure, and the fastener cooperates with the semicircular ring connector below the first fixing ring. During installation, the injection tube is inserted into the annular cavity of the small radius of the first fixing ring. After the fixing member is bolted to the semicircular ring connector, the sampling tube can be clamped, and at the same time, the annular seat is threadedly connected to the inner wall of the sampling tube, so that the first fixing ring can be fixed in the tube, completing the connection and tightening of the sampling tube bracket of the injection tube.

[0016] Preferably, in the above-mentioned air sample collection tube, it also includes a mounting tube, an upper flange, a support tube and a lower flange. The first end of the mounting tube is threadedly connected to the first end of the sampling tube through a flange plate; the two ends of the sampling tube pass through the tube lumen of the mounting tube; the upper flange is fixed to the second end of the mounting tube so that it can be fixed on the ceiling; the first end of the support tube penetrates into the inner cavity of the second end of the sampling tube and is threadedly connected thereto; the lower flange is fixed to the second end of the support tube so that it can be fixed on the ground. The sampling tube is fixed in the house through the mounting tube and the support tube to collect, analyze and detect the indoor air, which is convenient to install and use.

[0017] Preferably, in the above-mentioned air sample collection tube, a plurality of tapped holes are provided on the tube wall of the support tube; the sampling tube comprises a tube body and a sealing cover, a long slot along its length direction is provided on the tube wall at one end of the tube body, the long slot corresponds to the plurality of tapped holes, a self-tapping screw passes through the long slot and is threadedly connected with the tapped holes, so as to fix the sampling tube to the tube body; a semicircular long groove along its length direction is provided on the tube wall of the tube body opposite to the long slot, and the semicircular long groove is staggered with the long slot; a first through hole is provided on the groove wall of the semicircular long groove, so as to fix the connecting tube, the sealing cover is threadedly connected to the tube body for covering the semicircular long slot, and a plurality of second through holes are provided on the outer wall of the sealing cover, so as to be fixedly connected with a plurality of the sampling joints. The setting of the sampling tube cover and the semicircular long groove facilitates the disassembly between the sampling tube and the sampling tube; the first fixing ring is installed above the semicircular long groove by bolts, the sampling tube is inserted into the annular cavity of the first fixing ring, and then threadedly connected with the first fixing ring by fasteners, and the bottom end of the sampling tube is provided with an injection connector, and the injection connector is threadedly connected to the outer wall of the sampling tube. After the installation is completed, the cover is tightened by bolts to cover the semicircular long groove. When the sampling tube and the sampling tube need to be cleaned, they can be disassembled in the reverse order of installation.

[0018] Preferably, in the above-mentioned air sample collection tube, the sampling tube can slide along the outer wall of the support tube to adjust the height of the sampling tube relative to the support tube. The relative position between the sampling tube and the support tube is adjusted, and the self-tapping screw is threadedly connected with the tapping hole through the long slot, and the nut of the self-tapping screw abuts against the slot wall of the long slot, so that the tube and the support tube can be fixed; in order to adapt to the height of the house, the position of the tapping hole in the long slot can be adjusted, and then the height of the sampling tube relative to the support tube can be adjusted, which can be suitable for houses of different heights, with a wider range of use and flexible operation.

[0019] Preferably, in the above-mentioned air sample collection tube, the sampling tube is a double-layer structure, and a heat-insulating cavity is formed between its outer wall and inner wall. A heating belt is wrapped in the heat-insulating cavity near the inner wall of the sampling tube, and the heating belt is electrically connected to an external temperature controller through a wire; and heat-insulating cotton is filled between the heating belt and the outer wall of the sampling tube. The heating belt can heat the collected air and control the temperature of the air sample, and the heat-insulating cotton can maintain the stability of the temperature of the air sample, ensuring that the analysis and detection structure of the air sample is more accurate and true.

[0020] Preferably, in the above-mentioned air sample collection tube, the injection connector includes a connector tube and a sleeve, the two ends of the connector tube are respectively sleeved in the inner end of the injection tube and the inner cavity of the first end of the sampling tube, and the connector tube is threadedly connected to the outer wall of the injection tube; the sleeve is sleeved on the outer wall of the middle part of the connector tube, and its two end faces are respectively tightly fitted with the end faces of the injection tube and the sampling tube; the outer wall of the sleeve is tightly fitted with the inner wall of the sampling tube. The two ends of the injection connector are respectively connected to the injection tube and the sampling tube, and the air entering the injection tube can enter the sampling tube through the injection connector, and the air entering the tube is adopted through the sampling tube, and the collected air sample is analyzed and detected by entering the air analysis equipment through the connector.

[0021] Preferably, in the above-mentioned air sample collection tube, a sealing ring is provided between the outer wall of the sleeve and the inner wall of the sampling tube. The sealing ring can ensure the air tightness between the outer wall of the sleeve and the inner wall of the sampling tube, thereby ensuring the accuracy of the air sample.

[0022] Preferably, in the above-mentioned air sample collection tube, a silicone sealing ring is sleeved between the outer wall of the ring cover and the inner wall of the second fixing ring to ensure the sealing between the ring cover and the second fixing ring and prevent the collected air sample from flowing out from the gap of the sealing cover.

[0023] Preferably, in the above-mentioned air sample collection tube, a rainproof cap is fixed to the top of the sampling tube, which can prevent rainwater or dust from entering the sampling tube and affecting the air sampling effect.

[0024] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses an air sample collection tube, in which a heating belt and heat preservation cotton are arranged, which can better control the temperature of the air sample, and the operation of the fan can ensure the circulation of air, so that the air sample collected each time is always kept fresh and real-time; the split design of the sampling tube only requires the removal of the cover to complete the disassembly of the injection tube, and then the sampling tube and the injection tube can be cleaned, and the cleaning work can be completed without dismantling the overall structure, thereby reducing the labor intensity of the detection personnel and making the installation more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the air sample collection tube provided by the utility model;

[0027] Figure 2 A perspective view of the air sample collection tube provided by the utility model;

[0028] Figure 3 A cross-sectional view of the air sample collection tube provided by the utility model;

[0029] Figure 4 for Figure 3 A magnified schematic diagram of part A in FIG.

[0030] Figure 5 for Figure 3 A magnified schematic diagram of part B in FIG.

[0031] Figure 6 for Figure 3 The enlarged schematic diagram of the C part in FIG.

[0032] Figure 7 A schematic diagram of the explosion of the sampling tube provided by the utility model;

[0033] Figure 8 A schematic diagram of the structure of the first fixing ring provided by the utility model;

[0034] Fig. 9 A schematic diagram of the locking member structure provided by the utility model;

[0035] Fig.10 A schematic diagram of the structure of the injection connector provided by the utility model;

[0036] Fig.11 This is a schematic diagram of the structure of the second fixing ring provided by the utility model.

[0037] in:

[0038] 1- injection tube;

[0039] 2-mounting pipe; 21-upper flange;

[0040] 3-sampling tube; 31-sampling joint; 32-connecting tube; 33-long notch;

[0041] 4-support tube; 41-tapped hole; 42-lower flange;

[0042] 5-rain cap; 6-flange; 7-first fixing ring; 8-fastener; 9-injection connector; 10-ring cover; 11-second fixing ring; 12-heating belt; 13-insulation cotton. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] See attached Figures 1 to 10 The utility model embodiment discloses an air sample collection tube, comprising:

[0045] The sampling tube 3 has a first end and a second end, and a plurality of sampling connectors 31 connected to the outer wall thereof and communicating with the inner cavity of the tube are fixedly connected thereto, and the plurality of sampling connectors 31 can be connected to a plurality of air analysis devices one by one; a connecting tube 32 connected to the inner cavity of the tube is vertically fixed near the second end of the sampling tube 3, and a free end of the connecting tube 32 is connected to an air inlet of an external fan;

[0046] The sampling tube 1, one end of which is inserted into the inner cavity of the sampling tube 3 from the first end of the sampling tube 3 and corresponds to the position between the first end of the sampling tube 3 and the adjacent sampling connector 31;

[0047] A first fixing ring 7, which is sleeved on the outer wall of the sample injection tube 1, and the outer end side is threadedly connected to the inner wall of the sampling tube 3, and a fastener 8 is threadedly connected on one ring surface of the first fixing ring 7 to fasten the sample injection tube 1 and the sampling tube 3;

[0048] The sampling connector 9 is sleeved on the inner end of the sampling tube 1 and its outer wall is threadedly connected with the inner wall of the sampling tube 3;

[0049] The ring cover 10 is provided inside the sampling tube 3 and is located between the connecting tube 32 and the second end of the sampling tube 3;

[0050] The second fixing ring 11 , the outer wall of the second fixing ring 11 is threadedly connected to the inner wall of the sampling tube 3 , and the inner wall of the second fixing ring 11 is tightly fitted to the outer wall of the ring cover 10 .

[0051] In this embodiment, the sampling tube is installed in the room, and the sampling tube is installed vertically to collect, analyze and detect air samples in the room.

[0052] See attached Figure 4 , 8And 9, the first fixing ring 7 includes an annular seat 71 and a semicircular ring connector 72 fixed on an annular surface of the annular seat 71, and the outer end side of the annular seat 71 is threadedly connected to the inner wall of the sampling tube 3; a side wall of the fastener 8 is provided with a semicircular ring groove corresponding to the radius of the semicircular ring groove of the semicircular ring connector 72, and the end face of the fastener 8 is threadedly connected to the end face of the semicircular ring connector 72 to form an annular connector, and the inner wall of the annular connector is tightly fitted with the outer wall of the sampling tube 1.

[0053] See attached Figures 1 to 3 In order to further optimize the above technical solution, the sampling tube can be fixed in the house, the sampling tube extends out of the house to introduce the outside air into the room, and the tube is used to collect the indoor air. It also includes a mounting tube 2, an upper flange 21, a support tube 4 and a lower flange 42. The first end of the mounting tube 2 is threadedly connected to the first end of the sampling tube 3 through a flange 6; both ends of the sampling tube 1 pass through the inner cavity of the mounting tube 2; the upper flange 21 is fixed to the second end of the mounting tube 2 so that it can be fixed on the ceiling of the building; the first end of the support tube 4 penetrates into the inner cavity of the second end of the sampling tube 3 and is threadedly connected to it; the lower flange 42 is fixed to the second end of the support tube 4 so that it can be fixed on the ground.

[0054] Referring to Attachments 1 and 7, in order to further optimize the above technical solution and ensure that the sampling tube can be used in houses of different heights, a plurality of tapping holes 41 are provided on the tube wall of the support tube 4; the sampling tube 3 includes a tube body 34 and a cover 35, and a long slot 33 along its length direction is provided on the tube wall at one end of the tube body 34, and the long slot 33 corresponds to the plurality of tapping holes 41, and a self-tapping screw passes through the long slot 33 and is threadedly connected with the tapping hole 41, so as to fix the sampling tube 3 to the tube body 34; a semicircular long groove along its length direction is provided on the tube wall of the tube body 34 opposite to the long slot 33, and the semicircular long groove is staggered with the long slot 33; a first through hole is provided on the groove wall of the semicircular long groove for fixing the connecting tube 32, and the cover 35 is threadedly connected to the tube body 34 for covering the semicircular long slot, and a plurality of second through holes are provided on the outer wall of the cover 35 for fixed connection with a plurality of sampling joints 31.

[0055] The sampling tube 3 can slide along the outer wall of the supporting tube 4 to adjust the height of the sampling tube 3 relative to the supporting tube 4 .

[0056] When the installation height of the sampling tube needs to be adjusted, the relative position of the long slot and the tapped hole is changed by adjusting the height of the sampling tube relative to the supporting tube upward or downward, and a tapped hole of a suitable height is selected and the self-tapping screw is tightened with the tapped hole. The nut of the self-tapping screw abuts against the groove wall of the long slot, thereby fixing the position of the sampling tube relative to the supporting tube.

[0057] See attached Figure 3 and 5In order to further optimize the above technical solution and ensure that the collected sample air reaches the detection temperature, the sampling tube 3 has a double-layer structure, and a heat-insulating cavity is formed between its outer wall and inner wall. A heating belt 12 is wrapped on the inner wall side of the heat-insulating cavity close to the sampling tube 3. The heating belt 12 is electrically connected to an external temperature controller through a wire 14; and heat-insulating cotton 13 is filled between the heating belt 12 and the outer wall of the sampling tube 3.

[0058] See attached Figure 4 and 10 In order to further optimize the above technical solution and ensure the effective connection between the sampling tube and the sampling tube, the sampling joint 9 includes a joint tube 91 and a sleeve 92. The two ends of the joint tube 91 are respectively sleeved in the inner end of the sampling tube 1 and the inner cavity of the first end of the sampling tube 3. The joint tube 91 is threadedly connected to the outer wall of the sampling tube 1; the sleeve 92 is sleeved on the outer wall of the middle part of the joint tube 91, and its two end surfaces are respectively tightly fitted with the end surfaces of the sampling tube 1 and the sampling tube 3; the outer wall of the sleeve 92 is tightly fitted with the inner wall of the sampling tube 3.

[0059] In order to further optimize the above technical solution and ensure the sealing performance at the injection joint, a sealing ring is provided between the outer wall of the sleeve 92 and the inner wall of the sampling tube 3 .

[0060] In order to further optimize the above technical solution, ensure the sealing performance at the second end of the sampling tube and prevent air leakage, a silicone sealing ring is sleeved between the outer wall of the ring cover 10 and the inner wall of the second fixing ring 11.

[0061] In order to further optimize the above technical solution and prevent rainwater from entering the sampling tube and causing rust to occur, a rainproof cap 5 is fixed to the top of the sampling tube 1.

[0062] The utility model provides an air sample collection tube, air enters from a sampling tube, the sampling tube collects samples, and the collected samples enter an air analysis device through a joint to analyze and detect the air samples.

[0063] When the sampling tube needs to be cleaned, first remove the cover, loosen the screws that fix the second fixing ring on the second end of the sampling tube, and remove the sampling tube by slightly lifting it; and then remove the sampling joint; and then loosen the fasteners to remove the sampling tube. The sampling tube and the sampling tube can be cleaned comprehensively. Since the first fixing ring and the second fixing ring can fix the tube body and the cover at the same time, the overall structure will not be affected after the cover is removed.

[0064] The air sample collection tube provided by the utility model has an uninterrupted operation of the fan, which can ensure the effective circulation of air and ensure that a fresh air sample is used each time; the sampling tube can be cleaned only by removing the cover, and there is no need to disassemble the entire device, which facilitates the cleaning operation and reduces the labor intensity of the operators; at the same time, the bolt connection method is convenient for installation and disassembly, which improves the construction efficiency. One sampling tube can be connected to multiple air analysis equipment, which can ensure the accuracy of the analysis of the collected air samples and reduce the occurrence of detection errors.

[0065] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air sample collection tube, characterized in that: include: A sampling tube (3), the sampling tube (3) having a first end and a second end, a plurality of sampling connectors (31) connected to the tube cavity are fixedly connected to the outer wall of the sampling tube, and the plurality of sampling connectors (31) can be connected to a plurality of air analysis devices in a one-to-one correspondence; a connecting tube (32) connected to the tube cavity is vertically fixed near the second end of the sampling tube (3), and the free end of the connecting tube (32) is connected to the air inlet of an external fan; An injection tube (1), one end of which is inserted into the inner cavity of the sampling tube (3) from the first end of the sampling tube (3) and corresponds to the position between the first end of the sampling tube (3) and the adjacent sampling connector (31); A first fixing ring (7), the first fixing ring (7) being sleeved on the outer wall of the sample injection tube (1), and the outer end side of the first fixing ring (7) being threadedly connected to the inner wall of the sampling tube (3), and a fastener (8) being threadedly connected on an annular surface of the first fixing ring (7) to fasten the sample injection tube (1) and the sampling tube (3); An injection connector (9), the injection connector (9) is sleeved on the inner end of the injection tube (1) and the outer wall of the injection connector is threadedly connected to the inner wall of the sampling tube (3); A ring cover (10), wherein the gap of the ring cover (10) is arranged inside the sampling tube (3) and is located between the connecting tube (32) and the second end of the sampling tube (3); A second fixing ring (11), the outer wall of the second fixing ring (11) is threadedly connected to the inner wall of the sampling tube (3), and the inner wall of the second fixing ring (11) is tightly fitted to the outer wall of the ring cover (10).

2. An air sample collection tube according to claim 1, characterized in that: The first fixing ring (7) comprises an annular seat (71) and a semicircular ring connecting piece (72) fixed on an annular surface of the annular seat (71), and the outer end side of the annular seat (71) is threadedly connected to the inner wall of the sampling tube (3); a side wall of the fastener (8) is provided with a semicircular ring groove corresponding to the radius of the semicircular ring groove of the semicircular ring connecting piece (72), and the end face of the fastener (8) is threadedly connected to the end face of the semicircular ring connecting piece (72) to form an annular connecting piece, and the inner wall of the annular connecting piece is tightly fitted with the outer wall of the sampling tube (1).

3. The air sample collection tube according to claim 1, characterized in that: It also comprises a mounting tube (2), an upper flange (21), a support tube (4) and a lower flange (42); the first end of the mounting tube (2) is threadedly connected to the first end of the sampling tube (3) via a flange (6); both ends of the sampling tube (1) pass through the inner cavity of the mounting tube (2); the upper flange (21) is fixed to the second end of the mounting tube (2) so that it can be fixed on the ceiling; the first end of the support tube (4) penetrates into the inner cavity of the second end of the sampling tube (3) and is threadedly connected thereto; the lower flange (42) is fixed to the second end of the support tube (4) so ​​that it can be fixed on the ground.

4. The air sample collection tube according to claim 3, characterized in that: The support tube (4) is provided with a plurality of tapped holes (41) on its wall; the sampling tube (3) comprises a tube body (34) and a cover (35); a long slot (33) is provided on the tube wall at one end of the tube body (34) along its length direction; the long slot (33) corresponds to the plurality of tapped holes (41); a self-tapping screw passes through the long slot (33) and is threadedly connected to the tapped hole (41) for fixing the sampling tube (3) to the tube body (34); the tube A semicircular long groove is provided on the tube wall of the body (34) opposite to the long slot (33) along the length direction thereof, and the semicircular long groove is arranged in a staggered manner with the long slot (33); a first through hole is provided on the groove wall of the semicircular long groove for fixing the connecting tube (32); the sealing cover (35) is threadedly connected to the tube body (34) for covering the semicircular long groove; a plurality of second through holes are provided on the outer wall of the sealing cover (35) for fixedly connecting with a plurality of sampling joints (31).

5. An air sample collection tube according to claim 4, characterized in that: The sampling tube (3) can slide along the outer wall of the support tube (4) to adjust the height of the sampling tube (3) relative to the support tube (4).

6. The air sample collection tube according to claim 1, characterized in that: The sampling tube (3) is a double-layer structure, and a heat-insulating cavity is formed between its outer wall and inner wall. A heating belt (12) is wrapped around the inner wall side of the heat-insulating cavity close to the sampling tube (3), and the heating belt (12) is electrically connected to an external temperature controller through a wire (14); and heat-insulating cotton (13) is filled between the heating belt (12) and the outer wall of the sampling tube (3).

7. An air sample collection tube according to claim 6, characterized in that: The sampling joint (9) comprises a joint pipe (91) and a sleeve (92); the two ends of the joint pipe (91) are respectively sleeved in the inner end of the sampling pipe (1) and the inner cavity of the first end of the sampling pipe (3); the joint pipe (91) is threadedly connected to the outer wall of the sampling pipe (1); the sleeve (92) is sleeved on the outer wall of the middle part of the joint pipe (91), and the two end surfaces thereof are respectively tightly fitted with the end surfaces of the sampling pipe (1) and the sampling pipe (3); the outer wall of the sleeve (92) is tightly fitted with the inner wall of the sampling pipe (3).

8. An air sample collection tube according to claim 7, characterized in that: A sealing ring is sleeved between the outer wall of the sleeve (92) and the inner wall of the sampling tube (3).

9. The air sample collection tube according to claim 1, characterized in that: A silicone sealing ring is sleeved between the outer wall of the ring cover (10) and the inner wall of the second fixing ring (11).

10. The air sample collection tube according to claim 1, characterized in that: A rainproof cap (5) is fixed to the top end of the sample injection tube (1).

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