A sampling device for collecting dense gas samples

Abstract

The present invention relates to the field of sampling detection, and discloses a sampling device for collecting dense gas samples, which includes a connecting pipe, a sampling pipe, a buffer tank and a sampler. One side of the buffer tank is connected to the connecting pipe, and a pressure valve is arranged in the connecting pipe. The other side of the buffer tank is connected to the sampler through the sampling pipe. The sampler includes a tank body part and a tank mouth part arranged on the tank body part. A piston body is slidably arranged in the tank body part, and the bottom of the tank body is an opening. The sampling device further includes a bottom plate detachably connected to the opening at the bottom of the tank body part, and a first spring is provided with both ends abutted against the piston body and the bottom plate respectively. To provide a sampling device that can quickly store and sample dense gas.

Description

Technical Field

[0001] The present invention relates to the field of sampling detection, and particularly to a sampling device for collecting dense gas samples. Background Art

[0002] Dense gas, also known as supercritical fluid, is a special state different from ordinary gases and liquids. It has the dual characteristics of both liquids and gases. The density of dense gas is close to that of a liquid, while the viscosity and diffusion coefficient are close to those of a gas. Therefore, dense gas does not simply refer to a gas with a large density, but rather a gas with special physical properties under specific conditions (such as high temperature and high pressure). The density, viscosity, and diffusion coefficient of dense gas are different from those of ordinary gases. Sampling equipment needs to be connected to equipment such as compressors for sampling. After sampling, it is necessary to ensure the properties of the dense gas and then quickly conduct detection. Sampling dense gas is difficult and the operation is complex. Therefore, a sampling device that can quickly store and sample dense gas needs to be provided. Summary of the Invention

[0003] The present invention aims to provide a sampling device for collecting dense gas samples, so as to provide a sampling device that can quickly store and sample dense gas.

[0004] To achieve the above object, the present invention adopts the following technical solution: A sampling device for collecting dense gas samples includes a connecting pipe, a sampling pipe, a buffer tank, and a sampler. One side of the buffer tank is connected to the connecting pipe, and a pressure valve is provided in the connecting pipe. The other side of the buffer tank is connected to the sampler through the sampling pipe. The sampler includes a tank body part and a tank mouth part provided on the tank body part. A piston body is slidably provided in the tank body part. The bottom of the tank body is an opening, and it further includes a bottom plate detachably connected to the opening at the bottom of the tank body part. A first spring is provided with both ends respectively abutted against the piston body and the bottom plate.

[0005] The beneficial effects of this solution are:

[0006] In this technical solution, a connecting pipe, a buffer tank and a sampler are provided. When the compressor processes dense gas, by setting the value of the pressure valve, only the dense gas reaching the set pressure can enter the buffer tank through the connecting pipe for temporary storage. When the sampler is connected to the sampling pipe, the dense gas in the buffer tank can enter the tank body part. The density, viscosity and diffusion coefficient of the dense gas are different from those of ordinary gas. A spring is provided at the bottom of the tank body part, and the spring can provide a pre-pressure. During sampling, it drives the piston body to push upward to evacuate the internal gas of the tank body part, ensuring that a pure dense gas sample can be sampled. When the dense gas enters the tank body part, due to the existence of the pre-pressure, it helps to maintain the high-pressure state of the dense gas, delays the denaturation of the dense gas, and keeps the gas in a dense state, so as to ensure the accurate collection and preservation of the sample. As the dense gas in the tank increases, it drives the piston body to slide downward, continuously maintaining a high air pressure, ensuring rapid and efficient gas collection and stable preservation, reducing the analysis deviation caused by long-term sample preservation, and thus improving the accuracy and reliability of the analysis results.

[0007] Through the above settings, with the design of the pressure valve and the pre-pressure of the first spring on the piston body, it can be ensured that during the collection process, the dense gas remains in a high-pressure state in the tank body part, preventing the gas from undergoing a phase change or losing its dense characteristics due to changes in the external environmental pressure; the density, viscosity and diffusion coefficient of the dense gas remain stable under high pressure, which enables the collected gas sample to faithfully reflect its original characteristics, avoiding analysis errors caused by unstable pressure, and ensuring the accuracy and reliability of the sample.

[0008] Preferably, as an improvement, a connecting rod is fixed on the piston body, and a sealing cover is provided at the end of the connecting rod. The tank mouth part includes a tank mouth, and a sealing part that can be hermetically matched with the sealing cover is rotatably provided in the middle of the tank mouth.

[0009] The beneficial effects are as follows: Through the above settings, when sampling, the tank mouth is docked with the sampling pipe. Under the action of the elastic force of the first spring, it pushes the piston body to move upward, driving the sealing cover to slide in the sampling pipe. During the sliding process of the sealing cover, it can clean the inner wall of the sampling pipe, scrape off the dust and impurities on the pipe wall, improve the purity of the sample, and ensure the accuracy and reliability of the analysis results. At the same time, when the dense gas in the tank body part continuously increases and drives the piston body to slide downward, the sealing cover can cover the sealing part to achieve sealing, ensuring the integrity of the gas sample, avoiding gas leakage or denaturation caused by poor sealing during the sampling process, improving the stability of the gas sample, and reducing the error caused by poor sealing, ensuring the reliability of the sample.

[0010] Preferably, as an improvement, a plurality of limit blocks are circumferentially provided on the top of the inner wall of the tank mouth, a limit ring is provided on the top of the sealing cover, and limit openings are circumferentially provided on the limit ring with the same number as the limit blocks, so that the limit ring can slide through the limit blocks, an arc-shaped through groove is provided at the bottom of the tank body, a blind hole is provided on the side wall of the piston body, and an insert is also included, which can be inserted into the blind hole to drive the piston body to rotate along the arc-shaped through groove.

[0011] The beneficial effect is as follows: through the above arrangement, when the tank mouth is opened, the limit opening is aligned with the limit block, the sealing cover and the limit ring can slide through the limit block for ventilation, and when the sampling is completed and the sealing cover is closed on the sealing part, the insert can be inserted into the blind hole to drive the piston body to rotate along the arc groove, and the limit opening and the limit block are staggered, which can prevent the sealing cover from sliding outwards and thus achieve sealing, effectively preventing gas leakage after sampling, ensuring the integrity of the sample, and ensuring the gas pressure in the tank body, so that the sample can be tested within 24 hours. At the same time, during the rotation process, the limit block passes around the sealing cover, which can remove the impurities scraped off the upper surface of the sealing cover, so that the sealing cover remains clean, ensuring that there are no impurities left over from the last sampling process in the sample tube during the next sampling, ensuring that the gas sample will not be contaminated due to residual impurities during each sampling, and ensuring the accuracy of the analysis results.

[0012] Preferably, as an improvement, the sealing cover is circumferentially provided with a plurality of ventilation holes, the inner wall of the tank mouth is provided with a first annular groove, the sealing portion comprises a rotating ring and a second spring, the rotating ring is embedded in the first annular groove and slidably cooperates with the first annular groove, the second spring is embedded in the first annular groove and its two ends are respectively against the bottom surface of the first annular groove and the bottom surface of the rotating ring, and a plurality of sealing blocks which can be slidably inserted into the ventilation holes are fixed circumferentially on the inner wall of the rotating ring.

[0013] The beneficial effect is: through the above-mentioned arrangement, the multiple vent holes on the sealing cover cooperate with the sealing blocks on the rotating ring so that when the sealing cover slides downward, the sealing blocks are inserted into the vent holes to form a sealing body, thereby completely sealing the tank mouth to ensure a sealed state; when the piston body rotates, it drives the sealing cover and the rotating ring to rotate together; the embedded design of the rotating ring and the sliding cooperation of the first ring groove enable the rotating ring to slide smoothly, and the second spring provides appropriate pre-pressure to ensure that the upper surface of the sealing cover and the limit block can be accurately closed.

[0014] Preferably, as an improvement, a sealing ring is provided at the top of the vent hole, and a stepped groove matching the sealing ring is provided on the upper surface of the limit block.

[0015] Beneficial effect: After the sealing ring cooperates with the stepped groove on the limit block, when the sealing ring and the stepped groove are docked, a tighter closed structure can be formed, making the sealing ring more stable when in contact with the limit block, effectively preventing gas leakage and enhancing the sealing performance.

[0016] Preferably, as an improvement, there is also an outer tank for placing the tank body part and a tank cover that can be closed on the outer tank. There is a gap between the inner wall of the outer tank and the outer wall of the tank body part. A heat preservation cover is placed in the gap, and a temperature sensor is provided on the inner wall of the heat preservation cover.

[0017] The beneficial effects are as follows: The dissolution ability of dense gas depends on its temperature and pressure, and is usually positively correlated with the density of the fluid, increasing with the increase of the fluid density. Therefore, during the sampling process, the temperature and pressure conditions must be strictly controlled. The design of the heat preservation cover can effectively isolate the temperature change of the external environment, ensuring that the dense gas in the tank body part remains within a relatively stable temperature range. Since the properties of dense gas are closely related to temperature, a stable temperature helps to maintain the high-density state of the gas. By reducing the influence of external temperature fluctuations, the heat preservation cover can ensure that the sample maintains its characteristics during sampling and storage, avoiding changes in gas properties caused by temperature changes, thereby improving the accuracy and stability of the collected sample. The temperature sensor can provide accurate temperature data to ensure that during the entire sampling and storage process, the temperature of the dense gas is maintained within an appropriate range, avoiding sample denaturation or gas distortion caused by too high or too low temperature, thereby ensuring the reliability and repeatability of the collection results.

[0018] Preferably, as an improvement, a partition is fixedly sleeved on the outer walls of the upper and lower parts of the outer tank, and the partition is rectangular.

[0019] The beneficial effects are as follows: By setting the rectangular partition, when arranging multiple tanks in an array, it helps to maintain the gap between the tanks. The setting of the partition can provide additional support, reducing the risk of the tank tilting or collapsing during storage and transportation. Through the combination with the tank body, the partition enhances the overall structural stability, preventing to a certain extent the change of gas properties caused by the tilting and collapse of the tank, maintaining the integrity and stability of the gas sample, and at the same time avoiding mutual extrusion between the tanks.

[0020] Preferably, as an improvement, a detection port is also provided on the tank body part, and the detection port can be connected to a pressure gauge.

[0021] The beneficial effects are as follows: By connecting the detection port to the pressure gauge, the pressure change of the gas in the tank body part can be monitored in real time. The connection between the detection port and the pressure gauge can help the operator verify whether the air pressure in the tank meets the set standards before, during, and after sampling, helping the operator to understand the pressure condition in the tank at any time, ensuring the consistency and reliability of the sample in subsequent analysis.

[0022] Preferably, as an improvement, a filter screen is provided on the upper surface of the ventilation hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the sampler according to Embodiment 1 of the present invention;

[0024] Figure 2 Exploded view of the sampler in Embodiment 1 of the present invention;

[0025] Figure 3 is Figure 2 Enlarged schematic view of part A in

[0026] Figure 4 Cross-sectional view of the tank mouth in Embodiment 1 of the present invention;

[0027] Figure 5 Cross-sectional view of the tank mouth part in Embodiment 2 of the present invention. Detailed implementation manners

[0028] The following is a further detailed description through specific implementation manners:

[0029] The reference numerals in the accompanying drawings of the specification include: tank body part 1, piston body 2, bottom plate 3, connecting rod 4, sealing cover 5, tank mouth 6, limit block 7, limit ring 8, limit opening 9, arc-shaped through groove 10, blind hole 11, ventilation hole 12, first ring groove 13, rotating ring 14, first spring 15, plugging block 16, plugging ring 17, stepped groove 18, outer tank 19, tank cover 20, partition plate 21, second spring 22, arc-shaped groove 23.

[0030] Embodiment 1

[0031] Embodiment 1 is basically as Figures 1 - 4 shown, as Figure 1 and Figure 2A sampling device for collecting dense gas samples as shown, comprising a connecting pipe, a sampling pipe, a buffer tank and a sampler. One side of the buffer tank is connected to the connecting pipe, and a pressure valve is arranged in the connecting pipe. The pressure valve can be a conventional pressure control device such as an electromagnetic valve or a valve core. The other side of the buffer tank is connected to the sampler through the sampling pipe. The sampler includes a tank body part 1 and a tank mouth part arranged on the tank body part 1. A piston body 2 is slidably arranged in the tank body part 1, and the bottom of the tank body is an opening. It also includes a bottom plate 3 detachably connected to the opening at the bottom of the tank body part 1. A first spring 15 has two ends respectively abutted against the piston body 2 and the bottom plate 3. In this embodiment, a connecting ring is arranged on the bottom plate 3, and threads are arranged on both the connecting ring and the bottom of the tank body part 1 to realize the detachable connection between the bottom plate 3 and the tank body part 1, and it is convenient to replace the first spring 15, etc.; a detection port is also arranged on the tank body part 1, and the detection port can be connected to a pressure gauge. By connecting the detection port to the pressure gauge, the pressure change of the gas in the tank body part 1 can be monitored in real time. The connection between the detection port and the pressure gauge can help the operator verify whether the air pressure in the tank meets the set standard before, during and after sampling, so as to facilitate understanding the pressure condition in the tank at any time and ensure the consistency and reliability of the sample in subsequent analysis; partitions 21 are fixedly sleeved on the outer walls of the upper and lower parts of the outer tank 19. In this embodiment, the cross section of the partition 21 is rectangular. When arranging multiple tanks in an array, it helps to maintain the gap between the tanks. The setting of the partition 21 can provide additional support and reduce the risk of the tank tilting or collapsing during storage and transportation. Through the combination with the tank body, the partition 21 prevents the change of gas properties caused by the tilting and collapsing of the tank body, and maintains the integrity and stability of the gas sample. This technical solution is provided with a connecting pipe, a buffer tank and a sampler. When the compressor processes dense gas, by setting the value of the pressure valve, only the dense gas reaching the set pressure can enter the buffer tank through the connecting pipe for temporary storage. When the sampler is connected to the sampling pipe, the dense gas in the buffer tank can enter the tank body part 1. The density, viscosity and diffusion coefficient of dense gas are different from those of ordinary gas. A spring is arranged at the bottom of the tank body part 1, and the spring can provide a pre-pressure. During sampling, it drives the piston body 2 to move upward to empty the internal gas of the tank body part 1, ensuring that a pure dense gas sample can be sampled. When the dense gas enters the tank body part 1, due to the existence of the pre-pressure, it helps to maintain the high-pressure state of the dense gas, delay the denaturation of the dense gas, and keep the gas in a dense state to ensure the accurate collection and preservation of the sample. As the dense gas in the tank body increases, it drives the piston body 2 to slide downward, continuously maintaining a high air pressure, ensuring rapid and efficient gas collection and stable preservation, reducing the analysis deviation caused by long-term sample preservation, and thus improving the accuracy and reliability of the analysis result.

[0032] In this embodiment, the piston body 2 is fixed with such as Figure 2The connecting rod 4 shown in the figure has a sealing cover 5 at the end thereof, and the tank mouth portion includes a tank mouth 6. A sealing portion that can be rotatably provided in the middle of the tank mouth 6 and can be sealed with the sealing cover 5 is provided. When sampling is performed, the tank mouth 6 is docked with the sampling tube, and the piston body 2 is pushed to move under the elastic force of the first spring 15, driving the sealing cover 5 to slide in the sampling tube. During the sliding process of the sealing cover 5, the tube wall of the sampling tube can be cleaned, and dust and impurities on the tube wall can be scraped off. At the same time, filtering can be performed in the later stage to improve the purity of the sample and ensure the accuracy and reliability of the analysis results. At the same time, when the dense gas in the tank body 1 continues to increase and drives the piston body 2 to slide downward, the sealing cover 5 can cover the sealing portion to achieve sealing, thereby ensuring the integrity of the gas sample, avoiding gas leakage or denaturation due to poor sealing during the sampling process, and improving the stability of the gas sample. Figure 3 and Figure 4 As shown, in this embodiment, a plurality of limit blocks 7 are circumferentially arranged on the top of the inner wall of the tank mouth 6. In this embodiment, the number of limit blocks 7 is 5, and a limit ring 8 is arranged on the top of the sealing cover 5. The limit openings 9 with the same number as the limit blocks 7 are circumferentially arranged on the limit ring 8, so that the limit ring 8 can slide through the limit blocks 7. When the tank mouth 6 is opened, the limit openings 9 are aligned with the limit blocks 7, and the sealing cover 5 and the limit ring 8 can slide through the limit blocks 7 for ventilation. At the same time, during the rotation process, the limit blocks 7 pass around the sealing cover 5, which can remove the impurities scraped off the upper surface of the sealing cover 5, so that the surface of the sealing cover 5 is kept clean, ensuring that there is no impurity in the sample tube during the next sampling. In addition, there are impurities left over from the last sampling process. An arc-shaped through groove 10 is opened at the bottom of the tank body 1, and a blind hole 11 is opened on the side wall of the piston body 2. It also includes an insert, which can be inserted into the blind hole 11 to drive the piston body 2 to rotate along the arc-shaped through groove 10. When the sampling is completed, the sealing cover 5 is closed on the sealing part, and the insert can be inserted into the blind hole 11 to drive the piston body 2 to rotate along the arc-shaped through groove 10, and the limit opening 9 is staggered with the limit block 7, which can prevent the sealing cover 5 from sliding outward and thus achieve sealing, effectively preventing gas leakage after sampling, ensuring the integrity of the sample, and ensuring the air pressure of the gas in the tank body 1, so that the sample can be tested within 24 hours.

[0033] The sealing cover 5 is provided with a plurality of vent holes 12 in the circumferential direction. Figure 4As shown, a first annular groove 13 is formed in the inner wall of the can mouth 6. The sealing part includes a rotating ring 14 and a second spring 22. The rotating ring 14 is embedded and installed in the first annular groove 13 and is in sliding fit with it. The second spring 22 is embedded in the first annular groove 13 and its two ends respectively abut against the bottom surface of the first annular groove 13 and the bottom surface of the rotating ring 14. A plurality of blocking blocks 16 that can be slidably inserted into the ventilation holes 12 in a matching manner are circumferentially fixed on the inner wall of the rotating ring 14. In this embodiment, the number of both the ventilation holes 12 and the blocking blocks 16 is 5. When the sealing cover 5 slides downward, the cooperation between the plurality of ventilation holes 12 on the sealing cover 5 and the blocking blocks 16 on the rotating ring 14 enables the blocking blocks 16 to be inserted into the ventilation holes 12 when the sealing cover 5 slides downward, forming a sealing body, thereby completely blocking the can mouth 6 to ensure the sealed state. When the piston body 2 rotates, it drives the sealing cover 5 and the rotating ring 14 to rotate together. The embedded design of the rotating ring 14 and the sliding fit with the first annular groove 13 enable the rotating ring 14 to slide smoothly, and an appropriate pre-pressure is provided by the second spring 22 to ensure that the upper surface of the sealing cover 5 abuts against the limiting block 7 to accurately close. A filter screen is provided on the upper surface of the ventilation hole 12 in this embodiment to filter the dense gas entering the sampler. At the same time, a blocking ring 17 is provided at the top of the ventilation hole 12. Step grooves 18 that are matched with the blocking ring 17 are formed on the upper surfaces of the limiting blocks 7. After the blocking ring 17 is matched with the step grooves 18 on the limiting blocks 7, when the blocking ring 17 is butted against the step grooves 18, a more tightly closed structure can be formed, making the blocking ring 17 more stable when contacting the limiting blocks 7, effectively preventing gas leakage and enhancing the sealing performance.

[0034] An outer can 19 for placing the can body part 1 and a can lid 20 that can cover the outer can 19 are also provided. There is a gap between the inner wall of the outer can 19 and the outer wall of the can body part 1. A heat preservation cover is placed in the gap. A temperature sensor is provided on the inner wall of the heat preservation cover. The solubility of the dense gas depends on its temperature and pressure, and is usually positively correlated with the density of the fluid and increases with the increase of the fluid density. Therefore, during the sampling process, the temperature and pressure conditions must be strictly controlled. The design of the heat preservation cover can effectively isolate the temperature change of the external environment and ensure that the dense gas in the can body part 1 is maintained within a relatively stable temperature range. Since the properties of the dense gas are closely related to the temperature, a stable temperature helps to maintain the high-density state of the gas. By reducing the influence of external temperature fluctuations, the heat preservation cover can ensure that the sample maintains its characteristics during sampling and storage, avoiding changes in gas properties caused by temperature changes, thereby improving the accuracy and stability of the collected sample. The temperature sensor can provide accurate temperature data to ensure that during the entire sampling and storage process, the temperature of the dense gas is maintained within a suitable range, avoiding sample denaturation or gas distortion caused by too high or too low temperature, thereby ensuring the reliability and repeatability of the collection results.

[0035] Through the above settings, by setting the pre-pressure of the pressure valve and the first spring 15 on the piston body 2, it can be ensured that during the collection process, the dense gas remains in a high-pressure state within the tank body 1, preventing the gas from undergoing a phase change or losing its dense characteristics due to changes in the external environmental pressure; the density, viscosity, and diffusion coefficient of the dense gas remain stable under high pressure, which enables the collected gas sample to faithfully reflect its original characteristics, avoiding analysis errors caused by unstable pressure, and ensuring the accuracy and reliability of the sample.

[0036] Embodiment 2

[0037] Embodiment 2 is basically as Figure 5 shown. The difference between Embodiment 2 and Embodiment 1 is that a plurality of arc-shaped grooves 23 are circumferentially provided on the inner wall of the tank mouth 6. The distance from one end of the arc-shaped groove 23 to the center of the tank mouth 6 is less than the distance from the other end to the center of the tank mouth 6. The shape of the rotating ring 14 matches the shape of the inner wall of the tank mouth 6. The materials of the rotating ring 14 and the plugging block 16 are soft. The rotating ring 14 and the plugging block 16 can be made of materials with sealing functions such as silica gel. When the sealing cover 5 drives the rotating ring 14 to rotate, the outer wall of the rotating ring 14 and the inner wall of the tank mouth 6 are in sliding extrusion fit. Through the above settings, on the one hand, it can prevent the sealing cover 5 from sliding back and forth during transportation and affecting the stability of the seal, and on the other hand, it can reduce the gap between the plugging block 16 and the ventilation hole 12, ensuring the sealing performance of the device.

[0038] The above are only the embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics known in the solutions are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A sampling device for collecting dense gas samples, characterized in that: It includes a connecting pipe, a sampling pipe, a buffer tank and a sampler. One side of the buffer tank is connected to the connecting pipe. A pressure valve is arranged in the connecting pipe. The other side of the buffer tank is connected to the sampler through the sampling pipe. The sampler includes a tank body and a tank mouth arranged on the tank body. A piston body is slidably arranged in the tank body. The bottom of the tank body is an opening. It also includes a bottom plate detachably connected to the bottom opening of the tank body. Two ends of a first spring are respectively abutted against the piston body and the bottom plate. A connecting rod is fixed on the piston body, a sealing cover is arranged at the end of the connecting rod, and the tank mouth part includes a tank mouth, and a sealing part which can be rotatably matched with the sealing cover is arranged in the middle of the tank mouth; A plurality of limit blocks are arranged on the top of the inner wall of the tank mouth in the circumferential direction, a limit ring is arranged on the top of the sealing cover, and a limit opening with the same number as the limit blocks is arranged on the limit ring in the circumferential direction, so that the limit ring can slide through the limit blocks, an arc-shaped through groove is opened at the bottom of the tank body, a blind hole is opened on the side wall of the piston body, and an insert is also included, which can be inserted into the blind hole to drive the piston body to rotate along the arc-shaped through groove; The sealing cover is circumferentially provided with a plurality of vent holes, the inner wall of the tank mouth is provided with a first annular groove, the sealing portion comprises a rotating ring and a second spring, the rotating ring is embedded and installed in the first annular groove and slidably cooperates with the first annular groove, the second spring is embedded in the first annular groove and the two ends are respectively against the bottom surface of the first annular groove and the bottom surface of the rotating ring, and a plurality of sealing blocks which can be slidably inserted into the vent holes are fixed circumferentially on the inner wall of the rotating ring.

2. A sampling device for collecting dense gas samples according to claim 1, characterized in that: A sealing ring is arranged on the top of the vent hole, and stepped grooves matching with the sealing ring are arranged on the upper surface of the limit block.

3. A sampling device for collecting dense gas samples according to claim 2, characterized in that: An outer tank for placing the tank body and a tank cover that can cover the outer tank are also provided. There is a gap between the inner wall of the outer tank and the outer wall of the tank body. A heat preservation cover is placed in the gap. A temperature sensor is provided on the inner wall of the heat preservation cover.

4. A sampling device for collecting dense gas samples according to claim 3, characterized in that: The outer walls of the upper part and the bottom of the outer tank are both fixedly sleeved with a partition plate, which is rectangular.

5. A sampling device for collecting dense gas samples according to claim 4, characterized in that: The tank body is also provided with a detection port which can be connected to a pressure gauge.

6. A sampling device for collecting dense gas samples according to claim 5, characterized in that: A filter screen is arranged on the upper surface of the vent hole.

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