Liquid gas sampling device for chromatographic analysis
By designing the volume ratio between the transparent quantitative loop and the sample vaporization bottle, and through the coordinated structure of the four-valve pipeline, the problems of large sampling errors and cumbersome operation in liquefied gas sampling devices are solved. This achieves visualization of sample status, uniform vaporization, and closed-loop cleaning, thereby improving sampling accuracy and the reliability of analysis results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN WINTEC SPECIALTY GAS CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-06-19
AI Technical Summary
Existing liquefied gas sampling devices suffer from problems such as large sampling errors, poor vaporization effects, and cumbersome operation. In particular, the non-transparent quantitative tube makes it impossible to intuitively judge the sample state, the unoptimized volume ratio of the quantitative tube to the vaporization tank leads to liquid accumulation, and the separation of the cleaning circuit and the sampling circuit increases the number of steps and the risk of contamination.
The system employs a 1:600~1000 volume ratio design between a transparent quantitative loop and a sample vaporization bottle, combined with a four-valve pipeline collaborative structure, to achieve visualized observation of sample status, natural vaporization and mixing of liquid within the quantitative loop, forming a closed loop for cleaning and sampling, thus simplifying the operation process.
It improves sampling accuracy and the repeatability of analysis results, reduces equipment costs and energy consumption, ensures stable sample concentration, simplifies operation steps, and improves the stability and efficiency of the sampling process.
Smart Images
Figure CN224383221U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of chromatographic analysis, specifically a liquefied gas sampling device for chromatographic analysis. Background Technology
[0002] In the field of chromatographic analysis, the component detection of liquefied gas samples such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) requires sequential quantitative liquid sampling, uniform vaporization, and detection. However, existing sampling devices have many shortcomings: Most existing technologies use a structure of "metal quantitative tube + vaporization tank + valve assembly." Because the quantitative tube is not transparent, it is impossible to visually determine whether the sample is liquid, and pressure fluctuations can easily lead to gas contamination, causing quantitative deviations. Furthermore, the volume ratio of the quantitative tube to the vaporization tank is not optimized, and liquid tends to accumulate locally after entering the vaporization tank, making it difficult to naturally form a uniform gas concentration through volume difference. Additional stirring or heating devices are required, increasing structural complexity and energy consumption. Although some devices have cleaning functions, the cleaning circuit is separate from the sampling circuit, requiring external piping, which is not only cumbersome but also prone to sample contamination by residual impurities. Other solutions rely on flow and pressure sensors to determine the sample state and volume, which is costly, susceptible to temperature and pressure interference, and cannot replace the visual verification of "liquid filling the quantitative tube," leading to decreased quantitative accuracy. Utility Model Content
[0003] To address the problems mentioned in the background art, this utility model provides a liquefied gas sampling device for chromatographic analysis, which solves the problems of large sampling error, poor vaporization effect, and cumbersome operation.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a liquefied gas sampling device for chromatographic analysis, characterized in that it includes a sample inlet, a liquid injection valve, a transparent quantitative loop, a vaporization valve, a sample vaporization bottle, a sample outlet valve, and a sample outlet. The transparent quantitative loop has a bypass interface connected to a liquid sample purge valve. The liquid injection valve controls the flow of sample into the transparent quantitative loop. The liquid sample purge valve is used to discharge cleaning fluid or residual sample. The vaporization valve controls the liquid in the transparent quantitative loop to enter the sample vaporization bottle. The sample outlet valve controls the output of the vaporized sample. The volume ratio of the transparent quantitative loop to the sample vaporization bottle is (1:600~1000), allowing the liquid in the transparent quantitative loop to naturally vaporize and mix through volume difference after entering the sample vaporization bottle. The sample inlet is connected to the liquid injection valve, and the sample outlet is connected to the sample outlet valve.
[0005] Optionally, the transparent quantitative ring is a visual structure and quantitative sampling is achieved through visualization, and a quantitative volume of liquid sample is retained inside the transparent quantitative ring.
[0006] Optionally, the liquid injection valve, liquid sample purge valve, vaporization valve, and sample outlet valve constitute a dual-loop cleaning structure.
[0007] Optionally, the liquid entering through the transparent metering ring naturally vaporizes inside the bottle and is allowed to stand and mix for more than a minute. Through the structural design of the volume ratio (1:600~1000), it is ensured that a gaseous sample of uniform concentration is formed after the liquid vaporizes.
[0008] Optionally, the liquid injection valve, vaporization valve, sample outlet valve, and liquid sample purge valve are stainless steel shut-off valves, and the connecting pipes between the valves and the transparent quantitative ring and the sample vaporization bottle are stainless steel pipes.
[0009] Optionally, the sample outlet is used to connect to the injection port of a gas chromatograph, and by opening the sample outlet valve, the vaporized sample can be directly introduced into the chromatograph for analysis.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0011] This invention enables visual observation of the sample state during sampling by setting a transparent quantitative ring. Operators can directly confirm that what enters the quantitative ring is liquid rather than gas, effectively avoiding sampling errors caused by uncertain sample state. Compared with the blind sampling method of traditional non-transparent quantitative tubes, it significantly improves the accuracy of sampling. At the same time, the transparent quantitative ring integrates observation and quantification functions into a single structure, eliminating the need for additional sensors and other measuring components, simplifying the overall structure of the device and reducing equipment costs.
[0012] This invention establishes a structural relationship between a small volume liquid and a large volume vaporization by designing a transparent quantitative ring and a sample vaporization bottle at a volume ratio of 1:600~1000. This allows the liquid in the quantitative ring to diffuse naturally and fully vaporize after entering the vaporization bottle due to the volume difference. Uniform mixing of gaseous samples can be achieved without the need for additional stirring or heating devices, which reduces energy consumption and avoids sample contamination or compositional changes that may be caused by external intervention. This ensures the stability of the sample concentration entering the chromatograph and improves the repeatability and reliability of chromatographic analysis results.
[0013] This utility model adopts a four-valve group pipeline collaborative structure. The layout of the liquid injection valve, purge valve, vaporization valve and outlet valve forms a complete cleaning and sampling closed loop. During cleaning, by reasonably switching the valve state, residual impurities in the pipeline can be quickly discharged, avoiding the cumbersome operation and pollution risk caused by the separation of the cleaning loop and sampling loop in traditional devices. At the same time, the clear division of the valves makes the process of "cleaning-sampling-vaporization-detection" smoother, reduces manual operation steps, and reduces the probability of sample distortion due to operational errors.
[0014] This invention employs a step-by-step structural design for sampling and vaporization. First, the liquid is quantitatively intercepted within a transparent quantitative ring. Then, the liquid is controlled to enter the vaporization bottle for vaporization via a vaporization valve. This design ensures that the sampling and vaporization processes are independent yet sequentially connected, avoiding problems such as localized liquid accumulation and incomplete vaporization that easily occur when sampling and vaporization are performed simultaneously in traditional devices. This improves the stability and efficiency of the entire sampling process. Furthermore, the device as a whole forms a closed-loop structure of "sampling-vaporization-detection," which can be directly connected to a gas chromatograph. This simplifies the intermediate steps from sample collection to analysis, further ensuring sample purity and the timeliness of analysis. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] In the picture:
[0017] 1. Sample inlet; 2. Liquid injection valve; 3. Transparent metering loop; 4. Vaporization valve; 5. Sample vaporization bottle; 6. Sample outlet valve; 7. Sample outlet; 8. Liquid sample purge valve. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] like Figure 1 As shown, this utility model provides a liquefied gas sampling device for chromatographic analysis, characterized in that it includes a sample inlet 1, a liquid injection valve 2, a transparent quantitative loop 3, a vaporization valve 4, a sample vaporization bottle 5, a sample outlet valve 6, and a sample outlet 7. The transparent quantitative loop 3 has a bypass interface connected to a liquid sample purge valve 8. The liquid injection valve 2 controls the flow of sample into the transparent quantitative loop, and the liquid sample purge valve 8 is used to discharge cleaning fluid or residual sample. The vaporization valve 4 controls the liquid in the transparent quantitative loop 3 to enter the sample vaporization bottle 5. The sample outlet valve 6 controls the output of the vaporized sample. The volume ratio of the transparent quantitative loop 3 to the sample vaporization bottle 5 is (1:600~1000), allowing the liquid in the transparent quantitative loop 3 to naturally vaporize and mix through volume difference after entering the sample vaporization bottle 5. The sample inlet 1 is connected to the liquid injection valve 2, and the sample outlet 7 is connected to the sample outlet valve 6.
[0020] Specifically, when the liquid injection valve 2 and the liquid sample purge valve 8 are opened, the sample can be discharged from the sample inlet through the liquid injection valve 2, the transparent quantitative ring 3, and the liquid sample purge valve 8, thereby flushing the sampling pipeline. When the liquid injection valve 2 and the liquid sample purge valve 8 are closed, and the vaporization valve 4 and the sample outlet valve 6 are opened, the sample outlet is connected to a vacuum system, which can vacuum clean the sample vaporization bottle 5 and the pipeline containing the vaporization valve 4 and the sample outlet valve 6.
[0021] The transparent quantitative ring 3 is a visual structure and quantitative sampling is achieved through visualization. A quantitative volume of liquid sample is retained inside the transparent quantitative ring 3.
[0022] Specifically, by setting a transparent quantitative ring 3, this utility model enables visual observation of the sample state during the sampling process. Operators can directly confirm that what enters the quantitative ring is liquid rather than gas, effectively avoiding sampling errors caused by uncertain sample state. Compared with the blind sampling method of traditional non-transparent quantitative tubes, it significantly improves the sampling accuracy. At the same time, the transparent quantitative ring 3 integrates observation and quantification functions into a single structure, eliminating the need for additional sensors and other measuring components, simplifying the overall structure of the device and reducing equipment costs.
[0023] The liquid injection valve 2, liquid sample purging valve 8, vaporization valve 4, and sample outlet valve 6 constitute a dual-loop cleaning structure.
[0024] Specifically, a four-valve assembly with coordinated piping structure is adopted. The layout of liquid injection valve 2, purge valve, vaporization valve 4 and outlet valve forms a complete closed loop for cleaning and sampling. During cleaning, residual impurities in the pipeline can be quickly discharged by reasonably switching the valve status. This avoids the cumbersome operation and pollution risk caused by the separation of the cleaning loop and sampling loop in traditional devices. At the same time, the clear division of labor of the valves makes the process of "cleaning-sampling-vaporization-detection" smoother, reduces manual operation steps, and reduces the probability of sample distortion due to operational errors.
[0025] The liquid entering through the transparent quantitative ring 3 naturally vaporizes inside the bottle and is allowed to stand and mix for more than 30 minutes. Through the structural design of the volume ratio (1:600~1000), it is ensured that a gaseous sample with uniform concentration is formed after the liquid vaporizes.
[0026] Specifically, this invention designs a volume ratio (1:600~1000) between a transparent quantitative ring 3 and a sample vaporization bottle 5, establishing a structural relationship from small-volume liquid to large-volume vaporization. This allows the liquid in the quantitative ring to diffuse naturally and fully vaporize after entering the vaporization bottle due to the volume difference, achieving uniform mixing of gaseous samples without the need for additional stirring or heating devices. This reduces energy consumption and avoids sample contamination or compositional changes that may occur due to external intervention, ensuring stable sample concentration entering the chromatograph and improving the repeatability and reliability of chromatographic analysis results.
[0027] The liquid injection valve 2, vaporization valve 4, sample outlet valve 6, and liquid sample purge valve 8 are stainless steel shut-off valves, and the connecting pipes between the valves and the transparent quantitative ring 3 and the sample vaporization bottle 5 are stainless steel pipes.
[0028] The sample outlet 7 is used to connect to the inlet of the gas chromatograph. By opening the sample outlet valve 6, the vaporized sample can be directly introduced into the chromatograph for analysis.
[0029] Specifically, this invention employs a step-by-step structural design for sampling and vaporization. First, the liquid is quantitatively intercepted within the transparent quantitative ring 3. Then, the liquid is controlled to enter the vaporization bottle for vaporization via the vaporization valve 4. This design ensures that the sampling and vaporization processes are independent yet sequentially connected, avoiding problems such as localized liquid aggregation and incomplete vaporization that easily occur when sampling and vaporization are performed simultaneously in traditional devices. This improves the stability and efficiency of the entire sampling process. Furthermore, the device as a whole forms a closed-loop structure of "sampling-vaporization-detection," which can be directly connected to a gas chromatograph. This simplifies the intermediate steps from sample collection to analysis, further ensuring the purity of the sample and the timeliness of the analysis.
[0030] The working principle and usage process of this utility model are as follows: When the liquid injection valve 2 and the liquid sample purge valve 8 are opened, the sample can be discharged from the sample inlet through the liquid injection valve 2, the transparent quantitative ring 3, and the liquid sample purge valve 8, thus rinsing the sampling pipeline. When the liquid injection valve 2 and the liquid sample purge valve 8 are closed, and the vaporization valve 4 and the sample outlet valve 6 are opened, the sample outlet is connected to a vacuum system, which can vacuum clean the sample vaporization bottle 5 and the pipeline containing the vaporization valve 4 and the sample outlet valve 6. The pipeline collaborative structure of the four-valve group is adopted. The layout of the liquid injection valve 2, the purge valve, the vaporization valve 4, and the outlet valve forms a complete cleaning and sampling closed loop. During cleaning, by reasonably switching the valve state, residual impurities in the pipeline can be quickly discharged, avoiding the cumbersome operation and pollution risk caused by the separation of the cleaning loop and the sampling loop in traditional devices. At the same time, the clear division of the valves makes the process of "cleaning-sampling-vaporization-detection" smoother, reduces manual operation steps, and reduces the probability of sample distortion due to operational errors.
[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A liquefied gas sampling device for chromatographic analysis, characterized in that, The system includes a sample inlet (1), a liquid injection valve (2), a transparent quantitative loop (3), a vaporization valve (4), a sample vaporization bottle (5), a sample outlet valve (6), and a sample outlet (7). The transparent quantitative loop (3) is connected to a liquid sample purge valve (8) via a bypass interface. The liquid injection valve (2) controls the flow of the sample into the transparent quantitative loop. The liquid sample purge valve (8) is used to discharge cleaning fluid or residual sample. The vaporization valve (4) controls the liquid in the transparent quantitative loop (3) to enter the sample vaporization bottle (5). The sample outlet valve (6) controls the output of the vaporized sample. The volume ratio of the transparent quantitative loop (3) to the sample vaporization bottle (5) is 1:(600~1000), so that after the liquid in the transparent quantitative loop (3) enters the sample vaporization bottle (5), it naturally vaporizes and mixes through the volume difference. The sample inlet (1) is connected to the liquid injection valve (2), and the sample outlet (7) is connected to the sample outlet valve (6).
2. The liquefied gas sampling device for chromatographic analysis according to claim 1, characterized in that, The transparent quantitative ring (3) is a visual structure and quantitative sampling is achieved through visualization. A quantitative volume of liquid sample is retained inside the transparent quantitative ring (3).
3. The liquefied gas sampling device for chromatographic analysis according to claim 1, characterized in that, The liquid injection valve (2), liquid sample purging valve (8), vaporization valve (4), and sample outlet valve (6) constitute a dual-loop cleaning structure.
4. The liquefied gas sampling device for chromatographic analysis according to claim 1, characterized in that, The liquid entering the transparent quantitative ring (3) is naturally vaporized in the bottle and allowed to stand and mix for more than 30 minutes. Through the structural design of the volume ratio (1:600~1000), it is ensured that a gaseous sample with uniform concentration is formed after the liquid vaporizes.
5. A liquefied gas sampling device for chromatographic analysis according to claim 1, characterized in that, The liquid injection valve (2), vaporization valve (4), sample outlet valve (6) and liquid sample purge valve (8) are stainless steel shut-off valves, and the connecting pipes between these valves and the transparent quantitative ring (3) and sample vaporization bottle (5) are stainless steel pipes.
6. The liquefied gas sampling device for chromatographic analysis according to claim 1, characterized in that, The sample outlet (7) is used to connect to the inlet of the gas chromatograph. By opening the sample outlet valve (6), the vaporized sample can be directly entered into the chromatograph for analysis.