Liquid oxygen sampling equipment

Abstract

The utility model belongs to the technical field of sample collection, and discloses liquid oxygen sampling equipment which comprises a liquid sampler, and a second three-way valve, a first three-way valve and a needle valve are sequentially arranged on an outlet pipeline of the liquid sampler; the second three-way valve is connected with the pressure gauge, and the first three-way valve is connected with the gas connection gas circuit. The two three-way valves, the pressure gauge and the needle valve are additionally arranged on the sampler, the pressure gauge displays the pressure in the sampler, whether the sample amount in the sampler meets the analysis amount or not can be known through the pressure gauge, and meanwhile the pressure in the sampler can be known to guarantee use safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of sample collection, and particularly relates to a liquid oxygen sampling device. Background Art

[0002] When analyzing the total hydrocarbons and acetylene in liquid oxygen using a gas chromatograph, a liquid oxygen sample needs to be collected. The liquid oxygen sample is in a liquid state in the device and vaporizes instantaneously at room temperature. Since the solubilities of total hydrocarbons and acetylene in liquid oxygen and gaseous oxygen are different, the concentrations of total hydrocarbons and acetylene in the gaseous state are relatively small, which cannot represent the actual situation in the device and is not representative. Therefore, the sample must be in a liquid state during collection to ensure its representativeness. Conventional methods include collecting gas samples using gas bags or collecting a large amount of liquid oxygen with containers and bringing it back to the testing room for sampling. The former has poor sample representativeness and low results; the latter is not very safe because the temperature of liquid oxygen is extremely low (-183°C), and it is easy to cause cold injury accidents if personnel operate carelessly when bringing a large amount of liquid oxygen back to the testing room. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is: how to safely collect liquid oxygen at a low temperature.

[0004] To solve the above technical problem, the specific technical solution of the utility model is as follows:

[0005] A liquid oxygen sampling device includes a liquid sampler 4. A second three-way valve 3, a first three-way valve 2, and a needle valve 1 are sequentially arranged on the outlet pipeline of the liquid sampler 4. The second three-way valve 3 is connected to a pressure gauge 6, and the first three-way valve 2 is connected to a gas connection gas path.

[0006] Among them, the pressure gauge is used to display the pressure inside the liquid sampler.

[0007] The needle valve is a cryogenic needle valve with a valve cover.

[0008] The utility model has the following advantages: Two three-way valves, a pressure gauge, and a needle valve are installed on the sampler. The pressure gauge shows the pressure inside the sampler. Through the pressure gauge, it is possible to know whether the sample volume inside the sampler meets the analysis requirements, and at the same time, it is also possible to understand the pressure inside the sampler to ensure safe use. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the liquid oxygen sampling device of the utility model;

[0010] Marking description in the figure: 1. Needle valve; 2. First three-way valve; 3. Second three-way valve; 4. Liquid sampler; 5. Gas connection gas path; 6. Pressure gauge. Detailed Embodiment

[0011] To better understand the purpose, structure and function of the present utility model, the following will further describe the present utility model in detail with reference to the accompanying drawings.

[0012] As Figure 1 shown, the liquid oxygen sampling device of the present utility model includes a liquid sampler 4. A second three-way valve 3, a first three-way valve 2 and a needle valve 1 are sequentially arranged on the outlet pipeline of the liquid sampler 4; the second three-way valve 3 is connected to a pressure gauge 6, and the first three-way valve 2 is connected to a gas connection gas path 5. The gas discharge of the entire sampling device is controlled by the needle valve 1.

[0013] When using the liquid oxygen sampler for sampling, only about 1 mL of liquid oxygen needs to be filled into the sampler, sealed and then taken back to the testing room. The sample vaporizes in the sampler, which not only meets the representativeness of the sample but also solves the requirement that the sample is in a gaseous state during chromatographic analysis in the testing room.

[0014] After the liquid sample vaporizes in the sampler, the volume expands, causing the pressure in the steel cylinder to increase to 1.5 MPa. Two three-way valves, a pressure gauge and a needle valve are installed on the sampler. The pressure gauge shows the pressure inside the sampler. Through the pressure gauge, it is possible to know whether the sample volume inside the sampler meets the analytical requirements, and at the same time, it is also possible to understand the pressure inside the sampler to ensure safe use.

[0015] The needle valve is used to control the pressure during sample injection and relieve pressure in case of overpressure.

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

Claims

1. A liquid oxygen sampling device, characterized in that, It includes a liquid sampler (4), and a second three-way valve (3), a first three-way valve (2) and a needle valve (1) are sequentially arranged on the outlet pipeline of the liquid sampler (4); the second three-way valve (3) is connected to a pressure gauge (6), and the first three-way valve (2) is connected to a gas connection gas path.

2. The liquid oxygen sampling device according to claim 1, wherein The pressure gauge is used to display the pressure inside the liquid sampler.

3. The liquid oxygen sampling device according to claim 1, characterized in that, The needle valve is a low-temperature needle valve with a valve cover added.

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