A wood organic matter release detection device equipped with an organic matter gas sampling structure

Abstract

This invention relates to the field of gas detection technology, specifically to a wood organic matter release detection device equipped with an organic matter gas sampling structure. The device includes a constant temperature and pressure chamber and a door hinged to the front of the chamber. It also includes a circulation mechanism, which comprises interconnected circulation ducts formed on the inner walls of the four sides of the chamber. Several sets of guide vanes are installed in the circulation ducts on both sides, spaced equidistantly. This invention collects gas from multiple sampling holes at multiple points. The collected gas is transported to a mixing tank via a gas guide pipe for mixing. A gas distribution hood disperses the gas. A drive assembly drives several drive components to alternately rotate up and down, with opposite rotation directions for two opposing movable plates. These movable plates increase airflow disturbance. The mixed gas is then guided in different directions by a grid plate on the mixing grid, further improving the uniformity of gas mixing and enhancing detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically to a wood organic matter release detection device equipped with an organic matter gas sampling structure. Background Technology

[0002] As people's requirements for wooden furniture become increasingly demanding, it is essential to test wood for organic gases. The core purpose is to identify pollution risks in advance, protect human health, verify product compliance, and avoid long-term pollution of the indoor environment caused by the release of harmful gases such as formaldehyde and benzene from wood. Wooden furniture (especially engineered wood furniture) continuously releases organic gases such as formaldehyde, benzene, toluene, and xylene due to the use of urea-formaldehyde resin adhesives, paints, and edge banding strips. Long-term exposure to these gases can cause multi-system damage to human health.

[0003] Therefore, before using wood to make furniture, it is necessary to test the wood for organic matter release to assess its quality. Existing testing equipment involves placing the wood in a sealed chamber for several hours to allow it to naturally release organic matter, and then collecting and testing the gas in the chamber. This method has the following shortcomings: wood typically releases various organic gases such as formaldehyde, benzene, toluene, and xylene. Since different organic gases have different densities, and the airflow in a sealed chamber is poor, denser gases tend to settle, resulting in uneven gas distribution and inconsistent gas concentrations at different locations. This makes the sampled gas unrepresentative and affects the accuracy of the test. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a wood organic matter release detection device equipped with an organic gas sampling structure, comprising a constant temperature and pressure chamber and a door hinged to the front of the constant temperature and pressure chamber, and a circulation mechanism. The circulation mechanism includes circulating air ducts that are opened on the inner walls of the four sides of the constant temperature and pressure chamber and are interconnected. Several sets of air guide plates are installed in the circulating air ducts on both the left and right sides, which are distributed vertically and vertically.

[0005] The sampling mechanism includes a plurality of sampling holes that are equidistantly distributed on the door, a gas sampling unit is installed on the front side of the door, and a gas guide pipe for supplying gas to the gas sampling unit is connected to the plurality of sampling holes. A detection unit is installed below the gas sampling unit.

[0006] The gas sampling unit includes a gas mixing tank fixedly installed on the front side of the box door. The end of the gas guide pipe away from the sampling hole is connected to the top of the gas mixing tank. A gas distribution hood covering the gas guide pipe is fixedly installed on the inner wall of the gas mixing tank. Several circumferentially evenly distributed movable plates are hinged to the inner wall of the gas mixing tank. A gas mixing fan is rotatably installed inside the gas mixing tank. A drive assembly for driving the movable plates to flip up and down and driving the gas mixing fan to rotate is also installed on the gas mixing tank.

[0007] In one possible implementation, an isolation plate for sealing the circulating air duct is fixedly installed on the inner wall of the constant temperature and pressure chamber. The bottom of the isolation plate has several downward ventilation holes evenly distributed on the left and right sides, and a fan is fixedly installed on the top of the isolation plate.

[0008] In one possible implementation, each group of the air guide plates consists of two plates, which are distributed alternately up and down. The two air guide plates in the same group are oriented in opposite directions. The air guide plates are composed of an inclined plate and an arc-shaped plate connected to the bottom of the inclined plate. The air guide plates are fixedly installed on the left and right sides of the isolation plate.

[0009] In one possible implementation, the drive assembly includes a drive motor fixedly mounted on the top of the mixing tank. The bottom of the output shaft of the drive motor rotatably passes through the interior of the mixing tank and is coaxially fixedly connected to a rotating shaft. The bottom end of the rotating shaft rotatably passes through the bottom of the air distribution hood and is coaxially fixedly connected to the air mixing fan. An elliptical ring located between the air distribution hood and the air mixing fan is fixedly mounted on the drive motor.

[0010] In one possible implementation, the movable plate has a groove on the side near the central axis of the mixing tank, and movable slots are provided on the front and rear side walls of the groove. A movable frame is slidably installed between the two corresponding movable slots along its length. A sliding frame is rotatably installed at the end of the movable frame near the central axis of the mixing tank, and the sliding frame is slidably installed on the elliptical ring.

[0011] In one possible implementation, the interior of the mixing tank is further equipped with several mixing grilles located below the mixing fan and equidistantly distributed vertically. The uppermost mixing grille is composed of several inclined grille plates equidistantly distributed horizontally, and the adjacent grille plates are inclined vertically.

[0012] In one possible implementation, the detection unit includes a gas distribution pipe fixedly connected to the bottom of the mixing tank, the gas distribution pipe communicating with the mixing tank, a plurality of one-way ventilation valves evenly distributed on the left and right sides fixedly installed at the bottom of the gas distribution pipe, a mounting bracket located below the one-way ventilation valves fixedly installed on the front side of the door, a sample retention component fixedly installed at the bottom of the rightmost one-way ventilation valve through a pipe, and sampling bottles fixedly connected to the bottom of the other mounting brackets through pipes, and a placement slot for placing sampling bottles is provided above the mounting bracket.

[0013] In one possible implementation, the sample retention assembly includes a sealed container placed on top of a mounting frame. A sealing cap is detachably mounted on the top of the sealed container. A connector is mounted at the bottom center of the sealing cap. A gas collection bag is detachably mounted at the bottom of the connector. The top of the connector is fixedly connected to the rightmost one-way vent valve via a pipe. A sampling pump is fixedly mounted on the front side of the mounting frame. Several air inlets of the sampling pump are connected and communicated with the sampling bottle and the sealed container via pipes.

[0014] The beneficial effects of this invention are as follows: 1. This invention collects gas from multiple sampling holes at multiple points. The collected gas is transported to a mixing tank through a gas guide pipe for mixing. The gas is dispersed using a gas distribution hood. A driving component drives several driving components to alternately flip up and down. The flipping directions of two opposite moving plates are opposite. The moving plates increase the disturbance of the airflow and improve the uniformity of gas mixing. Then, the mixing fan blows the gas toward the mixing grid. The grid plates on the mixing grid guide the mixed gas in different directions, further improving the uniformity of gas mixing and improving the accuracy of detection.

[0015] 2. In this invention, when wood is placed in a constant temperature and pressure chamber to release gas, the gas in the chamber enters the bottom circulation duct through the lower ventilation hole, then flows upward through the circulation ducts on both sides to the fan, and is finally blown back into the constant temperature and pressure chamber by the fan. The fan agitates the gas inside the chamber to circulate continuously along the circulation duct, improving the uniformity of the gas inside the chamber. When the gas passes through the circulation ducts on the left and right sides, the air guide plate guides the gas to flow along an S-shaped trajectory. When the gas passes through the arc-shaped plate at the bottom of the air guide plate, the arc-shaped plate guides the gas to generate vortices, further improving the gas mixing effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a front sectional view of the constant temperature chamber of the present invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the air guide plate of the present invention.

[0019] Figure 4 This is a front sectional view of the mixing tank of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the movable plate of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the driving component of the present invention.

[0022] Figure 7 This is a separate view of the air-mixing grille of the present invention.

[0023] Figure 8 This is a partial cross-sectional view of the detection unit of the present invention.

[0024] In the diagram: 1. Constant temperature and pressure chamber; 11. Placement rack; 2. Chamber door; 3. Circulation mechanism; 31. Circulation air duct; 32. Isolation plate; 33. Lower ventilation hole; 34. Air guide plate; 35. Fan; 4. Sampling mechanism; 41. Sampling hole; 42. Gas sampling unit; 421. Mixing tank; 422. Gas distribution hood; 423. Movable plate; 4231. Groove; 4232. Movable slot; 4233. Movable rack; 4234. Sliding rack; 424. Mixing fan; 425, Drive assembly; 4251, Drive motor; 4252, Shaft; 4253, Elliptical ring; 426, Mixing grille; 43, Air guide pipe; 44, Detection unit; 441, Air distribution pipe; 442, One-way ventilation valve; 443, Mounting bracket; 444, Sampling bottle; 445, Sample retention assembly; 4451, Sealed container; 4452, Sealing cap; 4453, Connector; 4454, Air collection bag; 446, Sampling pump. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Please see Figure 1 - Figure 8 A wood organic matter release detection device equipped with an organic matter gas sampling structure includes a constant temperature and pressure chamber 1 and a door 2 hinged to the front of the constant temperature and pressure chamber 1. The constant temperature and pressure chamber 1 is also equipped with a placement rack 11 for carrying wood. It also includes a circulation mechanism 3. The circulation mechanism 3 includes circulation air ducts 31 that are opened on the inner walls of the four sides of the constant temperature and pressure chamber 1 and are interconnected. Several sets of air guide plates 34 are installed in the circulation air ducts 31 on both the left and right sides.

[0027] The sampling mechanism 4 includes a number of sampling holes 41 that are opened on the door 2 and are distributed at equal intervals. A gas sampling unit 42 is installed on the front side of the door 2. A gas guide pipe 43 for conveying gas to the gas sampling unit 42 is connected to the number of sampling holes 41. A detection unit 44 is installed below the gas sampling unit 42.

[0028] The gas sampling unit 42 includes a gas mixing tank 421 fixedly installed on the front side of the box door 2. The end of the gas guide pipe 43 away from the sampling hole 41 is connected to the top of the gas mixing tank 421. A gas distribution hood 422 is fixedly installed on the inner wall of the gas mixing tank 421 and covers the gas guide pipe 43. The gas distribution hood 422 has several small holes evenly distributed around the circumference. Several movable plates 423 evenly distributed around the circumference are hinged on the inner wall of the gas mixing tank 421. A gas mixing fan 424 is rotatably installed inside the gas mixing tank 421. A drive assembly 425 is also installed on the gas mixing tank 421 for driving the movable plates 423 to flip up and down and driving the gas mixing fan 424 to rotate.

[0029] In practical use, place the wood on the placement rack 11, then close the box door 2, allowing the wood to naturally release gas in the constant temperature and pressure box 1. The gas in the constant temperature and pressure box 1 circulates along the circulation duct 31 on the inner wall, and the air guide plates 34 on the left and right sides create vortices in the gas, improving the uniformity of the gas inside the constant temperature and pressure box 1.

[0030] Gas is collected from different locations inside the constant temperature and pressure chamber 1 through multiple sampling holes 41 distributed vertically. Then, the gases at different levels are transported to the mixing tank 421 through the gas guide pipe 43 for mixing. By sampling the gas from different locations in the constant temperature and pressure chamber 1, different sedimentation conditions due to different gas densities can be avoided, thus improving the accuracy of sampling.

[0031] After the gas enters the mixing tank 421, the gas is dispersed in different directions by the gas distribution hood 422. Then, the drive component 425 drives several movable plates 423 to rotate up and down repeatedly. The rotation direction of two opposite movable plates 423 is opposite. The movable plates 423 fan the gas to continuously generate convection, which further improves the uniformity of gas mixing. At the same time, the drive component 425 drives the mixing fan 424 to rotate, which drives the gas to rotate downward and promotes gas mixing. Finally, the gas is delivered to the detection unit 44 for detection.

[0032] Please see Figure 2 and Figure 3 An isolation plate 32 for sealing the circulating air duct 31 is fixedly installed on the inner wall of the constant temperature and pressure box 1. Several lower ventilation holes 33 are equidistantly distributed on the left and right sides at the bottom of the isolation plate 32. A fan 35 is fixedly installed on the top of the isolation plate 32.

[0033] In practical use, the gas at the bottom of the constant temperature and pressure chamber 1 enters the bottom circulation duct 31 through the lower ventilation hole 33, then moves upward along the left and right circulation ducts 31 to the upper circulation duct 31, and finally is blown to the top of the constant temperature and pressure chamber 1 by the fan 35, so that the gas inside the constant temperature and pressure chamber 1 circulates continuously, improving the uniformity of the gas.

[0034] Please see Figure 2 and Figure 3 Each group of air guide plates 34 consists of two plates, which are distributed alternately up and down. The two air guide plates 34 in the same group are in opposite directions. The air guide plate 34 is composed of an inclined plate and an arc plate connected to the bottom of the inclined plate. The air guide plate 34 is fixedly installed on the left and right sides of the isolation plate 32.

[0035] In practical use, when the gas moves upward along the circulating air ducts 31 on the left and right sides, the air guide plate 34 guides the gas to flow along an S-shaped trajectory. When the gas passes through the arc plate, the arc plate guides the gas to generate vortices, further improving the gas mixing effect and the uniformity of the gas.

[0036] Please see Figure 1 , Figure 4 and Figure 6 The drive assembly 425 includes a drive motor 4251 fixedly installed on the top of the mixing tank 421. The bottom of the output shaft of the drive motor 4251 rotates through the interior of the mixing tank 421 and is coaxially fixedly connected to a rotating shaft 4252. The bottom end of the rotating shaft 4252 rotates through the bottom of the air distribution hood 422 and is coaxially fixedly connected to the mixing fan 424. An elliptical ring 4253 located between the air distribution hood 422 and the mixing fan 424 is fixedly installed on the drive motor 4251.

[0037] In practical use, the drive motor 4251 drives the rotating shaft 4252 to rotate, and the rotating shaft 4252 drives the mixing fan 424 to rotate, so that the mixing fan 424 delivers the gas downward. At the same time, the rotating mixing fan 424 drives the gas to rotate continuously, which can improve the uniformity of gas mixing.

[0038] Please see Figure 4 - Figure 6 The movable plate 423 has a groove 4231 on the side near the central axis of the mixing tank 421. Movable grooves 4232 are provided on the front and rear side walls of the groove 4231. A movable frame 4233 is slidably installed between the two corresponding movable grooves 4232 along its length. A sliding frame 4234 is rotatably installed at the end of the movable frame 4233 near the central axis of the mixing tank 421. The sliding frame 4234 is slidably installed on the elliptical ring 4253.

[0039] In practical use, the elliptical ring 4253 is rotated by the rotating shaft 4252. Since the elliptical ring 4253 is inclined, the height of a certain point on it will continuously change up and down when the elliptical ring 4253 rotates. The elliptical ring 4253 drives the movable plate 423 to continuously flip up and down, which can improve the uniformity of the sampling gas mixture. During the up and down flipping process of the movable plate 423, the movable frame 4233 can slide along the length direction of the movable groove 4232, continuously adjusting the distance between the movable plate 423 and the elliptical ring 4253. At the same time, the sliding frame 4234 can rotate with the movable frame 4233, so that the sliding frame 4234 can match different parts of the elliptical ring 4253, thereby satisfying the connection between the movable plate 423 and the elliptical ring 4253 at different flipping angles.

[0040] Please see Figure 4 and Figure 7 Inside the mixing tank 421, there are also several mixing grilles 426 located below the mixing fan 424 and distributed at equal intervals. The uppermost mixing grille 426 is composed of several inclined grille plates distributed at equal intervals on the left and right, and the adjacent grille plates are inclined and vertically arranged.

[0041] In practical use, the sampling gas is blown downward by the mixing fan 424. When the gas passes through the multi-layer mixing grid 426, the grid plates on different mixing grids 426 will guide the sampling gas to flow in different directions. At the same time, the grid plates themselves will continuously split and merge the sampling gas, so that the sampling gas at different positions can be fully mixed together, further improving the uniformity of the sampling gas.

[0042] Please see Figure 1 and Figure 8 The detection unit 44 includes a gas distribution pipe 441 fixedly connected to the bottom of the gas mixing tank 421. The top of the gas distribution pipe 441 is connected to the bottom of the gas mixing tank 421. Several one-way ventilation valves 442 are fixedly installed at equal intervals on the left and right sides at the bottom of the gas distribution pipe 441. A mounting bracket 443 located below the one-way ventilation valves 442 is fixedly installed on the front side of the door 2. A sample retention component 445 is fixedly installed at the bottom of the rightmost one-way ventilation valve 442 through a pipe. Sampling bottles 444 are fixedly connected to the bottom of the other mounting brackets 443 through pipes. A placement slot for placing the sampling bottles 444 is opened on the top of the mounting bracket 443.

[0043] In practical use, the sampled gas, after being mixed in the mixing tank 421, enters downward into the gas distribution pipe 441, and is then distributed to different sampling bottles 444 and the sample retention component 445 through the one-way ventilation valve 442 at the bottom. The sample retention component 445 is used to retain the sampled gas. Before testing, different types of absorbent liquids need to be added to different sampling bottles 444. Phenolic reagent absorbent liquid is used in the sampling bottle 444 used to collect formaldehyde, and carbon disulfide absorbent liquid is used in the sampling bottle 444 used to collect benzene and toluene. The absorbent liquid in the sampling bottle 444 is used to collect the corresponding organic gases. Finally, the absorbent liquid is detected and analyzed by existing spectrophotometer and chromatograph to determine the content of formaldehyde, benzene and toluene.

[0044] Please see Figure 1 and Figure 8 The sample retention assembly 445 includes a sealed container 4451 placed on top of the mounting frame 443. A sealing cap 4452 is detachably installed on the top of the sealed container 4451. The sealed container 4451 and the sealing cap 4452 are connected by bolts. A connector 4453 is installed at the bottom center of the sealing cap 4452. A gas collection bag 4454 is detachably installed at the bottom of the connector 4453. The gas collection bag 4454 is connected to the connector 4453 by a clip. The top of the connector 4453 is fixedly connected to the rightmost one-way vent valve 442 through a pipe. A sampling pump 446 is fixedly installed on the front side of the mounting frame 443. Several air inlets of the sampling pump 446 are connected and communicated with the sampling bottle 444 and the sealed container 4451 through pipes.

[0045] In practical use, the sampling pump 446 draws gas from the sampling bottle 444 and the sealed container 4451, allowing the sampling gas to enter the sampling bottle 444 and the gas collection bag 4454. The organic gas entering the sampling bottle 444 is absorbed by the absorbent liquid, while the sampling gas entering the gas collection bag 4454 is retained. When the gas in the sealed container 4451 is full, the sealed container 4451 is removed from the sealing cap 4452. After sealing the interface of the gas collection bag 4454, the connecting clip is released, thus completing the retention of the sampled gas.

[0046] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A wood organic matter release detection device equipped with an organic matter gas sampling structure, comprising a constant temperature and pressure chamber (1) and a door (2) hinged to the front side of the constant temperature and pressure chamber (1), characterized in that, Also includes: The circulation mechanism (3) includes circulation ducts (31) that are opened on the inner walls of the upper, lower, left and right sides of the constant temperature and pressure box (1) and are interconnected. Several sets of air guide plates (34) are installed in the circulation ducts (31) on both the left and right sides. The sampling mechanism (4) includes a plurality of sampling holes (41) that are opened on the door (2) and are distributed at equal intervals. A gas sampling unit (42) is installed on the front side of the door (2). A gas guide pipe (43) for conveying gas to the gas sampling unit (42) is connected to the plurality of sampling holes (41). A detection unit (44) is installed below the gas sampling unit (42). The gas sampling unit (42) includes a gas mixing tank (421) fixedly installed on the front side of the box door (2). The end of the gas guide pipe (43) away from the sampling hole (41) is connected to the top of the gas mixing tank (421). A gas distribution hood (422) covering the gas guide pipe (43) is fixedly installed on the inner wall of the gas mixing tank (421). Several circumferentially evenly distributed movable plates (423) are hinged on the inner wall of the gas mixing tank (421). A gas mixing fan (424) is rotatably installed inside the gas mixing tank (421). A drive assembly (425) for driving the movable plates (423) to flip up and down and driving the gas mixing fan (424) to rotate is also installed on the gas mixing tank (421). The inner wall of the constant temperature and pressure chamber (1) is fixedly installed with an isolation plate (32) for sealing the circulating air duct (31). The bottom of the isolation plate (32) is provided with a number of downward ventilation holes (33) evenly distributed on the left and right. The top of the isolation plate (32) is fixedly installed with a fan (35). The number of air guide plates (34) in each group is two and they are distributed alternately up and down. The two air guide plates (34) in the same group are in opposite directions. The air guide plate (34) is composed of an inclined plate and an arc plate connected to the bottom of the inclined plate. The air guide plate (34) is fixedly installed on the left and right sides of the isolation plate (32).

2. The wood organic matter release detection device equipped with an organic matter gas sampling structure according to claim 1, characterized in that: The drive assembly (425) includes a drive motor (4251) fixedly installed on the top of the mixing tank (421). The bottom of the output shaft of the drive motor (4251) rotates through the interior of the mixing tank (421) and is coaxially fixedly connected to a rotating shaft (4252). The bottom end of the rotating shaft (4252) rotates through the bottom of the air distribution hood (422) and is coaxially fixedly connected to the mixing fan (424). An elliptical ring (4253) located between the air distribution hood (422) and the mixing fan (424) is fixedly installed on the drive motor (4251).

3. The wood organic matter release detection device equipped with an organic matter gas sampling structure according to claim 2, characterized in that: The movable plate (423) has a groove (4231) on one side near the central axis of the mixing tank (421). Movable slots (4232) are provided on the front and rear side walls of the groove (4231). A movable frame (4233) is slidably installed between the two corresponding movable slots (4232) along its length. A sliding frame (4234) is rotatably installed at one end of the movable frame (4233) near the central axis of the mixing tank (421). The sliding frame (4234) is slidably installed on the elliptical ring (4253).

4. The wood organic matter release detection device equipped with an organic matter gas sampling structure according to claim 1, characterized in that: The mixing tank (421) is also equipped with several mixing grilles (426) located below the mixing fan (424) and distributed at equal intervals. The uppermost mixing grille (426) is composed of several inclined grille plates distributed at equal intervals on the left and right, and the adjacent grille plates are inclined and vertically arranged.

5. The wood organic matter release detection device equipped with an organic matter gas sampling structure according to claim 1, characterized in that: The detection unit (44) includes a gas distribution pipe (441) fixedly connected to the bottom of the gas mixing tank (421). The gas distribution pipe (441) is connected to the gas mixing tank (421). Several one-way ventilation valves (442) are fixedly installed at the bottom of the gas distribution pipe (441) and are distributed equidistantly on the left and right. A mounting bracket (443) located below the one-way ventilation valve (442) is fixedly installed on the front side of the door (2). A sample retention component (445) is fixedly installed at the bottom of the one-way ventilation valve (442) on the far right through a pipe. Sampling bottles (444) are fixedly connected to the bottom of the other mounting brackets (443) through pipes. A placement slot for placing the sampling bottles (444) is opened above the mounting bracket (443).

6. The wood organic matter release detection device equipped with an organic matter gas sampling structure according to claim 5, characterized in that: The sample retention assembly (445) includes a sealed container (4451) placed on top of the mounting frame (443). A sealing cap (4452) is detachably installed on the top of the sealed container (4451). A connector (4453) is installed at the bottom center of the sealing cap (4452). A gas collection bag (4454) is detachably installed at the bottom of the connector (4453). The top of the connector (4453) is fixedly connected to the rightmost one-way vent valve (442) through a pipe. A sampling pump (446) is fixedly installed on the front side of the mounting frame (443). Several air inlets of the sampling pump (446) are connected and communicated with the sampling bottle (444) and the sealed container (4451) through pipes.

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