Airtight gas sampling device

Abstract

The utility model belongs to the technical field of gas detection, and discloses a gas closed sampling device which comprises a medium side valve (1), a flow limiting orifice plate (2), a sampling needle valve (3), a gas-liquid shared quick connector (4), a sampling ball bladder (5), a one-way valve (6) and a torch system valve (7), a medium side valve (1) is arranged at a sampled medium pipeline, a torch system valve (7) is arranged at a torch system, the medium side valve (1) and the torch system valve (7) are connected through a pipeline, a flow limiting orifice plate (2) and a one-way valve (6) are sequentially arranged on the pipeline, and a sampling needle valve (3) is arranged on the pipeline between the flow limiting orifice plate (2) and the one-way valve (6). And the sampling ball bladder (5) is connected with the sampling needle valve (3) through the gas-liquid shared quick connector (4). The device is simple in structure, easy-to-wear parts are reduced, maintenance is convenient, and cost is reduced; the pipeline is thicker than a closed sampler in diameter, so that the pipeline blockage risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection, and particularly relates to a gas closed sampling device. Background Technique

[0002] At present, common gas samplers are on-site samplers and closed samplers.

[0003] On-site sampler: When sampling, the on-site sampler uses a needle valve switch. The valve opening controls the sampling and discharging flow rate, and a balloon (other forms of sampling bags) is used for sampling. When the sampled medium components contain harmful substances such as hydrogen sulfide, if the flow rate is too large during sampling, the sealing of the sampling balloon interface is not good, and the medium leaks, there are risks of medium splashing and personnel poisoning. During replacement, on-site discharge is required, resulting in medium waste and environmental pollution. At the same time, there are risks of personnel poisoning and deflagration when encountering an open flame.

[0004] Closed sampler: The closed sampler is a relatively advanced sampling facility in terms of safety, environmental protection, energy consumption reduction, etc. among current samplers. However, both the sampling operation and the replacement operation are relatively cumbersome. Moreover, the control valves of the closed sampler mostly use plastic knobs. The process switching is frequent, and the switch knobs are easily damaged, increasing the frequency of maintenance and replacement. The process is complex, the number of valve switching points increases, and there are many flexible joints, so the potential leakage points also increase. The leakage is mostly slight and not easy to detect. After sampling, the gas accumulates in the sampling box. When sampling again, it is easy to cause physical damage to personnel and even poisoning in severe cases, seriously affecting the health of operators. At the same time, the medium pipelines in the closed sampling box are generally thin. When sampling media containing impurities and other particulate matters, there is a risk of pipeline blockage, which occurs frequently in actual production.

[0005] When the on-site sampler samples, if the valve is opened too large, it is easy to splash. During the replacement process, there are risks such as personnel poisoning and deflagration when encountering an open flame, and medium waste and environmental pollution are caused during replacement. When using the closed sampler, the process switching is frequent, the switch knobs are easily damaged, and the frequency of maintenance and replacement increases. There are many flexible joints, the potential leakage points increase, seriously affecting the health of operators. The medium pipelines in the closed sampling box are generally thin, and there is a risk of pipeline blockage. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is as follows: When the on-site sampler samples, if the valve is opened too large, it is easy to splash. During the replacement process, there are risks such as personnel poisoning and deflagration when encountering an open flame, and medium waste and environmental pollution are caused during replacement. When using the closed sampler, the process switching is frequent, the switch knobs are easily damaged, and the frequency of maintenance and replacement increases. There are many flexible joints, the potential leakage points increase, seriously affecting the health of operators. The medium pipelines in the closed sampling box are generally thin, and there is a risk of pipeline blockage.

[0007] To solve the above technical problems, the specific technical solutions of the utility model are as follows:

[0008] A gas tight sampling device includes a medium side valve 1, a flow limiting orifice plate 2, a sampling needle valve 3, a gas-liquid common quick connector 4, a sampling balloon 5, a check valve 6, and a flare system valve 7. A medium side valve 1 is provided at the pipeline of the medium to be sampled, and a flare system valve 7 is provided at the flare system. The medium side valve 1 and the flare system valve 7 are connected by a pipeline. The pipeline is sequentially provided with a flow limiting orifice plate 2 and a check valve 6. A sampling needle valve 3 is provided on the pipeline between the flow limiting orifice plate 2 and the check valve 6. The sampling balloon 5 is connected to the sampling needle valve 3 through the gas-liquid common quick connector 4.

[0009] The utility model has the following advantages: adding contents such as quick connectors, flow limiting orifice plates, and flare recovery pipelines realizes quick connection of sampling joints, good sealing performance, and improved safety; eliminating the problem of sampling splashing; replacing and recycling the gas in a closed manner, which is energy-saving and environmentally friendly, and improves the inherent safety of the sampling process; the sampling facility is simple, the number of vulnerable parts is reduced, it is convenient for maintenance, and the cost is reduced; the pipeline of the closed sampling device is thicker than the diameter of the pipeline, reducing the risk of pipeline blockage. Brief Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the gas tight sampling device of the utility model. Detailed Embodiments

[0011] In order to better understand the purpose, structure, and function of the utility model, the following will make a more detailed description of the utility model in conjunction with the drawings.

[0012] As Figure 1 shown, the gas tight sampling device of the utility model includes a medium side valve 1, a flow limiting orifice plate 2, a sampling needle valve 3, a gas-liquid common quick connector 4, a sampling balloon 5, a check valve 6, and a flare system valve 7.

[0013] A medium side valve 1 is provided at the pipeline of the medium to be sampled, and a flare system valve 7 is provided at the flare system. The medium side valve 1 and the flare system valve 7 are connected by a pipeline. The pipeline is sequentially provided with a flow limiting orifice plate 2 and a check valve 6. A sampling needle valve 3 is provided on the pipeline between the flow limiting orifice plate 2 and the check valve 6. The sampling balloon 5 is connected to the sampling needle valve 3 through the gas-liquid common quick connector 4.

[0014] In this embodiment, a flow limiting orifice plate is added before the sampling medium to prevent phenomena such as uncontrollable flow and splashing caused by opening the valve too wide during sampling operations; a quick connector for the sampling balloon is added to ensure quick connection during the sampling process, greatly improving the sealing effect, and adding a sampling replacement to the flare system, so that the replacement gas can be recovered during sampling replacement, which is safe and environmentally friendly.

[0015] The operation process is as follows: Open the valve 1 on the medium side and the valve 7 of the flare system to displace the medium inside the pipeline. After displacing the medium inside the pipeline, close the valve 7 of the flare system. Connect the sampling balloon 5 and the sampling needle valve 3 with the quick connector 4. Open the needle valve in front of the sampler. After filling the balloon with the gas medium, close the valve 1. Open the valve 7 of the flare system to conduct gas displacement inside the balloon. Since the valve 1 on the medium side is closed, the gas displaced inside the balloon will be discharged to the flare system. After the displacement is completed, open the valve 1 on the medium side again to fill the balloon. After sampling, close the valve 1, the valve 7 of the flare system and the sampling needle valve, and the sampling is completed.

[0016] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, for those skilled in the art, without departing from the principle of the present invention, several modifications and improvements can still be made, and these should also be regarded as falling within the protection scope of the present invention.

Claims

1. A gas-tight sampling device, characterized in that, It includes a medium-side valve (1), a flow-limiting orifice plate (2), a sampling needle valve (3), a gas-liquid common quick connector (4), a sampling balloon (5), a check valve (6), and a flare system valve (7); a medium-side valve (1) is provided at the pipeline of the medium to be sampled, a flare system valve (7) is provided at the flare system, the medium-side valve (1) and the flare system valve (7) are connected by a pipeline, a flow-limiting orifice plate (2) and a check valve (6) are sequentially arranged on the pipeline, a sampling needle valve (3) is arranged on the pipeline between the flow-limiting orifice plate (2) and the check valve (6), and the sampling balloon (5) is connected to the sampling needle valve (3) through a gas-liquid common quick connector (4).

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