A gas sampling device

Abstract

The utility model discloses a kind of gas quantitative sampling devices, including gas reserve tank and sampling tank, the inner chamber sliding and sealed connection of sampling tank has space limiting plate, the bottom of sampling tank is connected with a scale frame, a volume indicator plate and the volume scale of the volume indicator plate cooperation are used are equipped on scale frame, volume scale is used to show the volume of the sealed cavity formed by sampling tank and space limiting plate, the bottom of sampling tank is screw-connected with a screw rod piece, screw rod piece penetrates the bottom of sampling tank, the bottom of space limiting plate is rotatably connected between the upper end of screw rod piece, the lower end of screw rod piece is rotatably connected with volume indicator plate;The top of sampling tank is equipped with the gas inlet that communicates with sealed cavity, gas inlet is connected between the gas outlet on gas reserve tank by self-locking quick-release connection connector, and the gas outlet of the sealed cavity of sampling tank is equipped on sampling tank.

Description

Technical Field

[0001] This utility model belongs to the field of gas sampling technology, and in particular relates to a gas quantitative sampling device. Background Technology

[0002] To accelerate the increase of natural gas reserves and production, oilfields and research institutions often need to sample and analyze gases during reservoir research. Gas refers to a shapeless, compressible, and expandable fluid with volume. Because gas is constantly flowing, sampling is generally used to collect and analyze the extracted gas to better meet research needs and guide subsequent exploration deployments. As research progresses, sometimes specific gas detection and analysis require precise sample quantities, necessitating accurate sampling before analysis.

[0003] Conventional sampling methods often only allow determining the sample quantity based on the container's volume, making it difficult to manually control the sample size. Currently available quantitative gas sampling devices (CN220356751U and CN218994870U) control the sample size by manually controlling the opening time of manual or solenoid valves, and require high timeliness in valve closure. These devices only allow for adjustable sample sizes, enabling manual control over the amount sampled, but they cannot achieve precise sampling. Furthermore, untimely valve closure can sometimes lead to sample waste. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a gas quantitative sampling device to solve the problems of inaccurate sampling and gas waste in the existing gas sampling and detection process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A gas quantitative sampling device includes a gas storage tank and a sampling tank. The inner cavity of the sampling tank is slidably and sealingly connected to a space limiting plate. A scale frame is connected to the bottom of the sampling tank, and the scale frame is provided with a volume indicator plate and a volume scale that works in conjunction with the volume indicator plate. The volume scale is used to display the volume of the sealed cavity formed by the sampling tank and the space limiting plate. A screw is threadedly connected to the bottom of the sampling tank, and the screw penetrates through the bottom of the sampling tank. The upper end of the screw is rotatably connected to the bottom of the space limiting plate, and the lower end of the screw is rotatably connected to the volume indicator plate. The top of the sampling tank is provided with a gas inlet communicating with the sealed cavity. The gas inlet is connected to the gas outlet on the gas storage tank through a self-locking quick-release connector. The sampling tank is provided with a gas outlet for the sealed cavity.

[0006] Preferably, the self-locking quick-release connector is a C-type self-locking quick connector, and both the male and female ends of the C-type self-locking quick connector have a self-locking structure.

[0007] Preferably, the female connector of the C-type self-locking quick connector specifically includes a female connector body. A three-sided frame A is fixedly provided in the inner cavity of the female connector body. A gas channel for gas flow is formed between the three-sided frame A and the female connector body. A limiting member A is provided on the end of the three-sided frame A facing the female connector body and connected to the male connector. The end of the limiting member A facing the female connector body and connected to the male connector is a frustum structure. A sealing element is provided on the side of the frustum structure. The female connector body has a matching frustum surface at a position corresponding to the side of the frustum structure of the limiting member A. A spring member A is sleeved on the limiting member A. One end of the spring member A is connected to the three-sided frame A, and the other end of the spring member A is connected to the limiting member A. The spring member A is in a compressed state and can make the side of the frustum structure of the limiting member A in sealed contact with the frustum surface on the female connector body. A protrusion A that can push open the male connector is provided on the end of the limiting member A facing the female connector body and connected to the male connector.

[0008] Preferably, the male connector of the C-type self-locking quick connector specifically includes a male connector body. A three-sided frame B is fixedly provided in the inner cavity of the male connector body. A gas channel for gas flow is formed between the three-sided frame B and the male connector body. A limiting member B is provided on the end of the three-sided frame B facing the male connector body and connected to the female connector. The end of the limiting member B facing the male connector body and connected to the female connector is a frustum structure. A sealing element is provided on the side of the frustum structure. The male connector body has a matching frustum surface at a position corresponding to the side of the frustum structure of the limiting member B. A spring member B is sleeved on the limiting member B. One end of the spring member B is connected to the three-sided frame B, and the other end of the spring member B is connected to the limiting member B. The spring member B is in a compressed state and can make the side of the frustum structure of the limiting member B in sealing contact with the frustum surface on the male connector body. A protrusion B that can push open the female connector is provided on the end of the limiting member B facing the male connector body and connected to the female connector.

[0009] Preferably, the male connector is installed at the gas inlet of the sampling tank, and the female connector is installed at the gas outlet of the gas storage tank; Alternatively, the female connector is installed at the gas inlet of the sampling tank, and the male connector is installed at the gas outlet of the gas storage tank.

[0010] Preferably, the sampling tank is equipped with a pump body, the inlet of the pump body is connected to the self-locking quick-release connector, the outlet of the pump body is connected to the gas inlet of the sampling tank, and the gas outlet of the sampling tank is equipped with an exhaust valve.

[0011] Preferably, the sampling container is connected to a pressure gauge, and the pressure gauge is in communication with the sealed cavity.

[0012] Preferably, the gas inlet of the sampling tank is also equipped with a flow meter.

[0013] Preferably, the gas storage tank is equipped with a pressure gauge for the internal gas pressure of the detector.

[0014] Preferably, the side wall of the scale holder has an operating port for a tool for rotating the screw to pass through, and the operating port is located on one side of the screw.

[0015] This utility model has the following beneficial effects: In this invention, a space limiting plate is slidably and sealingly connected to the inner cavity of the sampling container. This space limiting plate forms a sealed cavity of a certain volume with the sampling container, and the volume of this sealed cavity is variable. This allows for sampling based on the required gas quantity, avoiding gas waste. A screw is threadedly connected to the bottom of the sampling container, penetrating through the bottom. The upper end of the screw is rotatably connected to the bottom of the space limiting plate. Therefore, by rotating the screw, the vertical position of the space limiting plate within the sampling container's inner cavity can be adjusted, thereby adjusting the volume of the sealed cavity. Furthermore, the screw's threaded connection to the bottom of the sampling container provides a self-locking function. Thus, once the volume of the sealed cavity is determined, as gas is introduced into the sealed cavity, causing pressure changes, the space limiting plate will not slide within the sampling container due to these pressure changes. This ensures the accurate determination of the sampling volume using this sampling device. A scale frame is connected to the bottom of the sampling container, which has a volume indicator plate and volume graduations that work in conjunction with the indicator plate. The volume graduations display the volume of the sealed cavity formed by the sampling container and the space limiting plate. The lower end of the screw is rotatably connected to the volume indicator plate. In the above structural design of this invention, when the screw rotates, the volume indicator plate can move up and down synchronously with the screw and the space limiting plate. Therefore, the volume of the sealed cavity can be accurately displayed through the volume graduations that work with the indicator plate. Thus, this invention can quickly and conveniently determine the volume of the sealed cavity based on the required gas volume. The gas inlet of the sampling container is connected to the gas outlet of the gas storage tank via a self-locking quick-release connector, which allows for convenient and quick connection between the sampling container and the gas source (i.e., the gas storage tank), facilitating operation. The sampling container is equipped with a gas outlet in a sealed cavity. When the gas inside the sampling container needs to be used, this outlet can be used to discharge the sample gas. Furthermore, by rotating the screw, the space limiting plate can be moved towards the top of the sampling container, gradually reducing the volume of the sealed cavity. This allows for the discharge of as much gas as possible, effectively increasing gas utilization and avoiding or reducing gas waste. In summary, this invention achieves accurate sampling and avoids gas waste. Attached Figure Description

[0016] Figure 1This is a front view of the gas quantitative sampling device provided in this embodiment of the utility model; Figure 2 This is a three-dimensional structural schematic diagram of the gas quantitative sampling device provided in this embodiment of the utility model; Figure 3 This is a three-dimensional structural diagram of the assembly of the storage seat and the outer tube conveying component in an embodiment of this utility model; Figure 4 This is a cross-sectional view of the assembly of the inner tube conveying component and the sampling tank in an embodiment of this utility model; Figure 5(a) is a schematic diagram of the half-section disassembly of the outer tube conveying component in an embodiment of the present invention; Figure 5(b) is a schematic diagram of the half-section disassembly of the inner tube conveying component in an embodiment of the present invention. Figure 6 This is a side view diagram of the half-section disassembly of the outer tube conveying component and the inner tube conveying component in the embodiment of this utility model; Figure label: 1. Storage seat; 101. Limiting frame; 102. Positioning frame; 103. Gas storage tank; 104. Input pipe; 105. Pressure gauge; 2. External pipe delivery component; 201. Three-sided frame A; 202. Limiting component A; 203. Spring component A; 204. Flow meter; 205. Protrusion A; 3. Internal pipe delivery component; 301. Three-sided frame B; 302. Limiting component B; 303. Spring component B; 304. Protrusion B; 4. Sampling tank; 401. Space limiting plate; 402. Screw component; 403. Volume indicator plate; 404. Pump body; 405. Exhaust valve; 406. Operating port. Detailed Implementation

[0017] The present invention will now be clearly and completely described with reference to the accompanying drawings and embodiments. The described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0018] See Figures 1-4This embodiment of the gas quantitative sampling device includes a gas storage tank 103 and a sampling tank 4. The inner cavity of the sampling tank 4 is slidably and sealingly connected to a space limiting plate 401. A scale frame is connected to the bottom of the sampling tank 4. The scale frame is provided with a volume indicator plate 403 and a volume scale that works in conjunction with the volume indicator plate 403. The volume scale is used to display the volume of the sealed cavity formed by the sampling tank 4 and the space limiting plate 401. A screw member 402 is threadedly connected to the bottom of the sampling tank 4. The screw member 402 passes through the bottom of the sampling tank 4. The upper end of the screw member 402 is rotatably connected to the bottom of the space limiting plate 401, and the lower end of the screw member 402 is rotatably connected to the volume indicator plate 403. The top of the sampling tank 4 is provided with a gas inlet communicating with the sealed cavity. The gas inlet is connected to the gas outlet on the gas storage tank 103 through a self-locking quick-release connector. The sampling tank 4 is provided with a gas outlet for the sealed cavity.

[0019] In this embodiment, the gas quantitative sampling device is used by first adjusting the vertical position of the space limiting plate 401 by rotating the screw 402, so that the volume of the sealed cavity formed by the sampling tank 4 and the space limiting plate 401 is equal to the volume of the gas to be sampled. Then, the gas storage tank 103 and the sampling tank 4 are connected by a self-locking quick-release connector. After the connection is completed, the self-locking quick-release connector connects the gas storage tank 103 and the sampling tank 4, so that the gas in the gas storage tank 103 flows into the sampling tank 4 due to the pressure difference. After sampling is completed, the self-locking quick-release connector is separated. At this time, the self-locking quick-release connector can seal the gas outlet on the gas storage tank 103 to prevent gas leakage. For added security, a valve can also be installed on the gas outlet of the gas storage tank 103 to seal the gas outlet. At the same time, it can also seal the gas inlet of the sampling tank 4 to prevent gas leakage. The gas in sampling container 4 can then be used for experiments. During the experiment, the gas in sampling container 4 can be discharged through the gas outlet of the sealed cavity. This gas outlet can be equipped with a valve. When the gas in sampling container 4 is small and the exhaust is slow, the space limiting plate 401 can be moved upward by rotating the screw 402, thereby further reducing the volume of the sealed cavity, so that the remaining gas in the sealed cavity can be discharged and utilized.

[0020] As an optional implementation of this utility model, in this embodiment, the self-locking quick-release connector adopts a C-type self-locking quick connector, and both the male and female heads of the C-type self-locking quick connector have a self-locking structure.

[0021] As an optional embodiment of this utility model, see Figure 5(a) and Figure 6In this embodiment, the female connector of the C-type self-locking quick connector, as described above, specifically includes a female connector body. A three-sided frame A 201 is fixedly installed inside the female connector body. A gas channel for gas flow is formed between the three-sided frame A 201 and the female connector body. A limiting member A 202 is provided on the end of the three-sided frame A 201 facing the male connector on the female connector body. The end of the limiting member A 202 facing the male connector on the female connector body is a frustum structure. A sealing element is provided on the side of the frustum structure. A matching frustum surface is provided on the female connector body at a position corresponding to the side of the frustum structure of the limiting member A 202. A spring A 203 is fitted on the limiting member A 202. One end of the spring A 203 is connected to the three-sided frame A 201, and the other end of the spring A 203 is connected to the limiting member A 202. The spring A 203 is in a compressed state and can cause the limiting member A 202 to be compressed. The side of the frustum structure of 202 is in sealed contact with the frustum surface of the female head body, thereby achieving self-locking of the female head. The end of the limiting member A 202 facing the female head body and connected to the male head is provided with a protrusion A205 that can push open the male head. When the male and female heads are inserted, the protrusion B 304 in the male head abuts against the protrusion A 205, causing the side of the frustum structure of the limiting member A 202 to lose the sealed contact with the frustum surface of the female head body, thereby realizing the conduction of the inner cavity of the male and female heads, thus realizing the flow of gas from the sample gas storage tank 103 into the sampling tank 4. When the male and female heads are separated, due to the restoring force of the spring A 203, the side of the frustum structure of the limiting member A 202 re-seales with the frustum surface of the female head body, thereby achieving self-locking of the female head and preventing gas from leaking from the female head.

[0022] As an optional embodiment of this utility model, see Figure 5(b) and Figure 6In this embodiment, the male connector of the C-type self-locking quick connector, as described above, specifically includes a male connector body. A three-sided bracket B301 is fixedly installed inside the male connector body. A gas channel for gas flow is formed between the three-sided bracket B301 and the male connector body. A limiting member B302 is provided on the end of the three-sided bracket B301 facing the male connector body and connected to the female connector. The end of the limiting member B302 facing the male connector body and connected to the female connector is a frustum structure. A sealing element is provided on the side of the frustum structure. The male connector body is positioned at a position corresponding to the side of the frustum structure of the limiting member B302. The device has a matching frustum surface. A spring B303 is fitted onto the limiting member B302. One end of the spring B303 is connected to the tripod B301, and the other end is connected to the limiting member B302. The spring B303 is in a compressed state, which allows the side of the frustum structure of the limiting member B302 to make a sealing contact with the frustum surface on the male connector body, thereby achieving self-locking of the male connector. The limiting member B302 has a protrusion B304 on the end of the male connector body that connects to the female connector, which can push open the female connector. When the male and female connectors are inserted, the protrusion B304 in the female connector... When the male and female protrusions B304 abut against each other, the side of the frustum structure of the limiting member B302 is no longer in sealed contact with the frustum surface on the male body, thus achieving communication between the inner cavities of the male and female heads, and allowing the gas in the sample gas storage tank 103 to flow into the sampling tank 4. When the male and female heads separate, due to the restoring force of the spring member B303, the side of the frustum structure of the limiting member B302 re-seales with the frustum surface on the male body, thus achieving self-locking of the male head and preventing gas from leaking from the male head.

[0023] As an optional embodiment of this utility model, in this embodiment, the male connector is installed at the gas inlet of the sampling tank 4, and the female connector is installed at the gas outlet of the gas storage tank 103, such as... Figure 2 As shown; or, the female connector is installed at the gas inlet of the sampling tank 4, and the male connector is installed at the gas outlet of the gas storage tank 103. Either of these methods is acceptable.

[0024] As a preferred embodiment of this utility model, see [link to embodiment]. Figure 4 In this embodiment, the sampling tank 4 is equipped with a pump body 404. The inlet of the pump body 404 is connected to the self-locking quick-release connector, and the outlet of the pump body 404 is connected to the gas inlet of the sampling tank 4. In this embodiment, the pump body 404 can accelerate the flow of gas from the gas storage tank 103 into the sampling tank 4, improving sampling efficiency. Furthermore, the pump body 404 can also ensure that the gas in the sampling tank 4 reaches a preset pressure. The gas outlet of the sampling tank 4 is equipped with an exhaust valve 405, which effectively controls the discharge operation of the sampling tank 4.

[0025] As a preferred embodiment of this utility model, see [link to embodiment]. Figure 4In this embodiment, the sampling container 4 is connected to a pressure gauge, which is in communication with the sealed cavity. The pressure gauge allows for quick and accurate observation of the pressure within the sampling container 4.

[0026] As a preferred embodiment of this utility model, see [link to embodiment]. Figure 6 In this embodiment, the gas inlet of the sampling tank 4 is also equipped with a flow meter 204. The flow meter 204 can be used to measure the amount of gas delivered from the gas storage tank 103 to the sampling tank 4, which helps to measure the amount of sampled gas in the sampling tank 4.

[0027] As a preferred embodiment of this utility model, see [link to embodiment]. Figure 1 In this embodiment, the gas storage tank 103 is equipped with a pressure gauge 105 for detecting the internal gas pressure. This pressure gauge 105 allows for real-time monitoring of the gas pressure in the gas storage tank 103 and whether any leaks have occurred, ensuring the safety of the gas storage tank 103.

[0028] As a preferred embodiment of this utility model, see [link to embodiment]. Figure 4 In this embodiment, the side wall of the scale holder is provided with an operating port 406 for a tool for rotating the screw 402 to pass through. The operating port is located on one side of the screw 402. The operating port 406 provides a certain operating space for rotating the screw 402.

[0029] Example 1: like Figures 1 to 6 As shown: This embodiment provides a gas quantitative sampling device, including: a storage base 1; a limiting frame 101 is fixedly installed at the top of the storage base 1, a gas storage tank 103 is fixedly installed at the upper part of the inner side of the limiting frame 101, and an outer tube delivery component 2 (i.e., the female end of the aforementioned C-type self-locking quick connector) is provided at the front end of the gas storage tank 103. Figure 2 , Figure 6 The inner tube conveying component 3 (i.e., the male end of the aforementioned C-type self-locking quick connector) is inserted into the right end of the inner tube conveying component 3. The front end of the inner tube conveying component 3 (i.e., Figure 2 , Figure 6 A sampling container 4 is located at the right end (as shown). A scale frame is located below the sampling container 4, and a threaded hole is opened at the middle of the bottom of the sampling container 4. A screw rod 402 is rotatably connected to the threaded hole of the sampling container 4. A space limiting plate 401 is rotatably connected to the top of the screw rod 402. The space limiting plate 401 is slidably connected to the inside of the sampling container 4, and the circumference (i.e., side) of the space limiting plate 401 is sealed to the inner wall of the sampling container 4. A volume indicator plate 403 is located at the bottom of the screw rod 402, and the volume indicator plate 403 is located in the scale frame below the sampling container 4. A pump body 404 is located at the top of the sampling container 4. The front end of the pump body 404 (i.e., Figure 2 , Figure 4 An exhaust valve 405 is provided at the right end shown. When the pump body 404 is started, it accelerates the gas inside the gas storage tank 103 to pass through the outer pipe conveyor 2 and the inner pipe conveyor 3 and quickly enter the sampling tank 4, thereby improving the sampling effect of the sampling tank 4.

[0030] Among them, the rear end of the restraint frame 101 (i.e. Figure 1 A positioning frame 102 is fixedly installed above the left end shown. The front end of the positioning frame 102 (i.e., Figure 1 The position shown on the right end is opposite to the rear end of the gas storage tank 103 (i.e., the right end shown). Figure 1 The gas storage tank 103 is fixedly connected at the left end position shown. An input pipe 104 is provided at the rear end position of the top of the gas storage tank 103, and a pressure gauge 105 is provided at the front end position of the top of the gas storage tank 103. The pressure gauge 105 is located at the front end of the input pipe 104 (i.e., the left end shown). Figure 1 At the position shown on the right, pressure gauge 105 will visually display the pressure inside gas storage tank 103, and pressure gauge 105 can be used to measure the sealing performance.

[0031] This embodiment adopts the method shown in Figure 5(a)- Figure 6 The outer pipe conveying component 2 and the inner pipe conveying component 3 are shown.

[0032] When using the gas quantitative sampling device in this embodiment: First, gas is introduced into the gas storage tank 103 through the input pipe 104 for storage. When it is necessary to sample the gas inside the gas storage tank 103 quantitatively, the outer pipe delivery component 2 and the inner pipe delivery component 3 are inserted and fixed. Then, the screw component 402 is rotated. Through the cooperation between the screw component 402 and the threaded hole at the bottom of the sampling tank 4, the position of the space limiting plate 401 inside the sampling tank 4 is adjusted, and the storage space above the sampling tank 4 is adjusted. When the screw component 402 rotates, it will drive the volume indicator plate 403 to move within the scale frame below the sampling tank 4. By reading the scale value of the volume indicator plate 403 being flush with the scale frame inside the sampling tank 4, the current capacity of the sampling tank 4 can be determined, thus achieving the effect of quantitative sampling.

[0033] When the pump body 404 is started, it accelerates the gas inside the gas storage tank 103 to pass through the outer pipe conveying component 2 and the inner pipe conveying component 3 and quickly enter the sampling tank 4, thereby improving the sampling effect of the sampling tank 4.

[0034] After sampling is completed by sampling tank 4, the outer tube delivery component 2 and the inner tube delivery component 3 disengage. At this time, the protruding contact post B on the limiting component B 302 and the protruding contact post A205 on the limiting component A 202 are no longer in contact. When the limiting member A 202 is not subjected to the squeezing force of the limiting member B 302, the spring member A 203 will be in an extended state, thereby driving the limiting member A 202 to reset. The conical position of the limiting member A 202 will fit against the conical position of the outer tube conveying member 2, and the rubber ring set by the limiting member A 202 will seal the internal space of the outer tube conveying member 2, preventing the leakage of the original gas sample of the gas storage tank 103 inside the outer tube conveying member 2.

[0035] When the limiting member B 302 is not subjected to the squeezing force of the limiting member A 202, the spring member B 303 will be in an extended state, thereby driving the limiting member B 302 to reset. The conical position of the limiting member B 302 will fit against the conical position of the inner tube conveying member 3, and the rubber ring set by the limiting member B 302 will seal the internal space of the inner tube conveying member 3, preventing leakage of the gas sample taken quantitatively by the sampling tank 4 from the inner tube conveying member 3.

[0036] The device described in this embodiment has excellent sealing performance, preventing gas leakage and reducing gas loss. It achieves precise quantitative sampling, improving sampling and detection efficiency and accuracy. Simultaneously, by effectively preventing gas leakage, it reduces resource waste, lowers costs, and ensures stable operation. Furthermore, by adding baffles inside the tank, it can effectively block moisture and eliminate moisture interference. Overall, the technical level is relatively high, providing fundamental technical support for the fine exploration of natural gas in the Ordos Basin.

[0037] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A gas quantitative sampling device, characterized in that, The system includes a gas storage tank (103) and a sampling tank (4). The inner cavity of the sampling tank (4) is slidably and sealingly connected to a space limiting plate (401). A scale frame is connected to the bottom of the sampling tank (4). The scale frame is provided with a volume indicator plate (403) and a volume scale that cooperates with the volume indicator plate (403). The volume scale is used to display the volume of the sealed cavity formed by the sampling tank (4) and the space limiting plate (401). A screw (40) is threadedly connected to the bottom of the sampling tank (4). 2) The screw (402) penetrates the bottom of the sampling tank (4), the upper end of the screw (402) is rotatably connected to the bottom of the space restriction plate (401), and the lower end of the screw (402) is rotatably connected to the volume indicator plate (403); the top of the sampling tank (4) is provided with a gas inlet communicating with the sealed cavity, and the gas inlet is connected to the gas outlet on the gas storage tank (103) through a self-locking quick-release connector, and the sampling tank (4) is provided with a gas outlet of the sealed cavity.

2. The gas quantitative sampling device according to claim 1, characterized in that, The self-locking quick-release connector adopts a C-type self-locking quick connector, and both the male and female ends of the C-type self-locking quick connector have a self-locking structure.

3. A gas quantitative sampling device according to claim 2, characterized in that, The C-type self-locking quick connector specifically includes a female connector body. A three-sided bracket A (201) is fixedly installed inside the female connector body. A gas channel for gas flow is formed between the three-sided bracket A (201) and the female connector body. A limiting member A (202) is provided on the end of the three-sided bracket A (201) facing the female connector body and connected to the male connector. The end of the limiting member A (202) facing the female connector body and connected to the male connector is a frustum structure. A sealing element is provided on the side of the frustum structure. The female connector body is connected to the side of the frustum structure of the limiting member A (202). A matching frustum is provided at the corresponding position. A spring A (203) is fitted on the limiting member A (202). One end of the spring A (203) is connected to the three-sided frame A (201), and the other end of the spring A (203) is connected to the limiting member A (202). The spring A (203) is in a compressed state and can make the frustum structure side of the limiting member A (202) seal in contact with the frustum on the female head body. The end of the limiting member A (202) facing the female head body and connected to the male head is provided with a protrusion A (205) that can push open the male head.

4. A gas quantitative sampling device according to claim 2, characterized in that, The male connector of the C-type self-locking quick connector specifically includes a male connector body. A three-sided bracket B (301) is fixedly installed inside the male connector body. A gas channel for gas flow is formed between the three-sided bracket B (301) and the male connector body. A limiting member B (302) is provided on the end of the three-sided bracket B (301) facing the male connector body and connected to the female connector. The end of the limiting member B (302) facing the male connector body and connected to the female connector is a frustum structure. A sealing element is provided on the side of the frustum structure. The male connector body is connected to the side of the frustum structure of the limiting member B (302). A matching frustum is provided at the corresponding position. A spring B (303) is fitted on the limiting member B (302). One end of the spring B (303) is connected to the three-sided frame B (301), and the other end of the spring B (303) is connected to the limiting member B (302). The spring B (303) is in a compressed state and can make the frustum structure side of the limiting member B (302) seal in contact with the frustum on the male head body. A protrusion B (304) that can push open the female head is provided on the end of the limiting member B (302) that faces the male head body and is connected to the female head.

5. A gas quantitative sampling device according to any one of claims 2-4, characterized in that, The male connector is installed at the gas inlet of the sampling tank (4), and the female connector is installed at the gas outlet of the gas storage tank (103); Alternatively, the female connector is installed at the gas inlet of the sampling tank (4), and the male connector is installed at the gas outlet of the gas storage tank (103).

6. A gas quantitative sampling device according to claim 1, characterized in that, The sampling tank (4) is equipped with a pump body (404), the inlet of the pump body (404) is connected to the self-locking quick-release connector, the outlet of the pump body (404) is connected to the gas inlet of the sampling tank (4), and the gas outlet of the sampling tank (4) is equipped with an exhaust valve (405).

7. A gas quantitative sampling device according to claim 1, characterized in that, The sampling container (4) is connected to a pressure gauge, which is in communication with the sealed cavity.

8. A gas quantitative sampling device according to claim 1, characterized in that, The gas inlet of the sampling tank (4) is also equipped with a flow meter (204).

9. A gas quantitative sampling device according to claim 1, characterized in that, The gas storage tank (103) is equipped with a pressure gauge (105) for the internal gas pressure of the detector.

10. A gas quantitative sampling device according to claim 1, characterized in that, The scale holder has an operating port (406) on its side wall for a tool for rotating the screw (402) to pass through. The operating port is located on one side of the screw (402).

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