Closed sampling device

Abstract

The utility model discloses a closed sampling device which comprises a sampling bottle, an inlet of the sampling bottle is connected with a feeding pipeline, an outlet of the sampling bottle is connected with a replacement pipeline, the feeding pipeline is connected with a circulating pipeline in parallel, and the feeding pipeline is further connected with a nitrogen pipeline in parallel. The device disclosed by the utility model has the beneficial effects that (1) the device is provided with the circulating pipeline, so that circulation is carried out before sampling, air in a sample is replaced, the quality of the sample is as average as possible, and an obtained result is real and reliable; (2) a nitrogen pipeline and a replacement pipeline are arranged, so that the sample is not in contact with water or oxygen in the sampling process, the sampling accuracy and safety are ensured, and meanwhile, the sample is not left after the sampling is finished; and (3) corresponding temperature control medium can be selected according to the actual condition of the sample by using the jacket sampling bottle, so that the sampling stability is ensured.

Description

Technical Field

[0001] The utility model belongs to a sampling device for hazardous chemicals, in particular to a closed sampling device. Background Art

[0002] Continuous chemical industrial production equipment needs to detect the component content of reaction liquid intermediates or synthetic liquids every day. Normal chemical products can be sampled on-site, but the sampling liquid has properties such as being sensitive to water and oxygen, reacting when in contact with water, and being easily oxidized. Traditional sampling methods will not meet the sampling conditions, which will be a major hidden danger to sampling personnel and on-site safety. In addition, traditional sampling methods are not easy to operate and require frequent visits to the sampling port to open and close the valve, which is inefficient and has a high risk factor. Summary of the Invention

[0003] In response to the above-mentioned problems in the prior art, the utility model provides a closed sampling device, whose technical solution is: it includes a sampling bottle, the inlet of the sampling bottle is connected to the feed pipeline, the outlet of the sampling bottle is connected to the replacement pipeline, the circulation pipeline is connected in parallel to the feed pipeline, and the feed pipeline is also connected in parallel with the nitrogen pipeline.

[0004] As a preferred solution, the sample main pipe feed valve, sample feed control valve and circulation pipeline valve are arranged in sequence on the feed pipeline according to the fluid flow direction, and a sampler switch valve is arranged in parallel at the feed pipeline and the circulation pipeline.

[0005] As a preferred solution, a check valve and a sample return main pipe valve are sequentially arranged on the circulation pipeline according to the direction of fluid flow.

[0006] As a preferred solution, a nitrogen replacement valve and a vacuum valve are provided on the replacement pipeline, and the nitrogen replacement valve and the vacuum valve are provided in parallel.

[0007] As a preferred solution, a nitrogen purge valve and a nitrogen control valve are sequentially arranged on the nitrogen pipeline according to the direction of gas flow.

[0008] As a preferred embodiment, an inlet sampler valve is provided at the inlet of the sampling bottle, and the inlet sampler valve is connected to the feed pipeline through a feed joint. An outlet sampler valve is provided at the outlet of the sampling bottle, and the outlet sampler valve is connected to the replacement pipeline through a vacuum nitrogen joint.

[0009] As a preferred solution, the sampling bottle is also provided with a pressure gauge.

[0010] As a preferred solution, the sampling bottle is a jacketed structure, and a temperature control medium outlet and a temperature control medium inlet are provided at the jacket.

[0011] Beneficial effects of the utility model:

[0012] (1) The device is equipped with a circulation pipeline to allow circulation before sampling, displacing the air in the sample and making the sample quality as uniform as possible, so that the results obtained are true and reliable;

[0013] (2) By setting up nitrogen pipelines and displacement pipelines, the sample will not come into contact with water or oxygen during the sampling process, ensuring the accuracy and safety of sampling, and no sample will remain after the sampling is completed;

[0014] (3) When using a jacketed sampling bottle, you can select the appropriate temperature control medium according to the actual situation of the sample to ensure the stability of the sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure: 1. Sample return main pipe valve; 2. Nitrogen purge valve; 3. Sample main pipe feed valve; 4. Nitrogen control valve; 5. Sample feed control valve; 6. Check valve; 7. Sampler switch valve; 8. Pressure gauge; 9. Nitrogen displacement valve; 10. Vacuum valve; 11. Circulation pipeline valve; 12. Sampling bottle; 13. Feed connector; 14. Vacuum nitrogen connector; 15. Temperature control medium outlet; 16. Temperature control medium inlet; 17. Sampler inlet valve; 18. Sampler outlet valve; 19. Feed pipeline; 20. Circulation pipeline; 21. Displacement pipeline; 22. Nitrogen pipeline. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below based on the accompanying drawings and specific embodiments.

[0018] Example

[0019] like Figure 1 The closed sampling device shown is characterized in that it includes a sampling bottle 12, the inlet of the sampling bottle 12 is connected to the feed pipeline 19, the outlet of the sampling bottle 12 is connected to the replacement pipeline 21, the circulation pipeline 20 is connected in parallel to the feed pipeline 19, and the feed pipeline 19 is also connected in parallel with the nitrogen pipeline 22.

[0020] Furthermore, the feed pipeline 19 is provided with a sample main pipe feed valve 3, a sample feed control valve 5 and a circulation pipeline valve 11 in sequence according to the fluid flow direction, and a sampler switch valve 7 is provided in parallel with the feed pipeline 19 and the circulation pipeline 20.

[0021] Furthermore, a check valve 6 and a sample return main pipe valve 1 are sequentially provided on the circulation pipeline 20 according to the fluid flow direction.

[0022] Furthermore, a nitrogen replacement valve 9 and a vacuum valve 10 are provided on the replacement pipeline 21, and the nitrogen replacement valve 9 and the vacuum valve 10 are provided in parallel.

[0023] Furthermore, a nitrogen purge valve 2 and a nitrogen control valve 4 are sequentially arranged on the nitrogen pipeline 22 according to the direction of gas flow.

[0024] Furthermore, an inlet sampler valve 17 is provided at the inlet of the sampling bottle 12, and the inlet sampler valve 17 is connected to the feed pipeline 19 through the feed connector 13. An outlet sampler valve 18 is provided at the outlet of the sampling bottle 12, and the outlet sampler valve 18 is connected to the replacement pipeline 21 through the vacuum nitrogen connector 14. The connection using the connector is convenient and fast, and the operation is simple.

[0025] Furthermore, the sampling bottle 12 is also provided with a pressure gauge 8 for observing the pressure index in the sampling bottle 12 .

[0026] Furthermore, the sampling bottle 12 is a jacket structure, and a temperature control medium outlet 15 and a temperature control medium inlet 16 are provided at the jacket, and different temperature control media can be selected according to different sampling requirements.

[0027] The operation process of the above device is as follows: keep all valves closed, connect the sampler 12 to the feed line 19 and the displacement line 21 through the feed connector 13 and the vacuum nitrogen connector 14, then open the vacuum valve 10, and pump negative pressure into the inside of the sampling bottle 12 until the pressure gauge 8 shows -0.1Mpa, close the vacuum valve 10, open the nitrogen displacement valve 9, and fill with nitrogen until the pressure gauge 8 shows 0.1Mpa, repeat the above operation three times, and finally open the vacuum valve 10 until the pressure gauge shows a pressure of -0.01Mpa, and pass the temperature control medium into the jacket of the sampling bottle 12 for insulation, and complete the sampling preparation;

[0028] Keep the sampler switch valve 7 closed, maintain the internal pressure of the sampling bottle 12 at -0.05Mpa, close the sampler outlet valve 18, open the sample main pipe feed valve 3, the sample feed control valve 5, the circulation pipeline valve 11, and the return sample main pipe valve 1. After the sample circulates for 5 minutes, open the sampler switch valve 7 and close the return sample main pipe valve 1. After completing the sampling operation, close the sampler inlet valve 17 and the sampler outlet valve 18, disconnect the feed connector 13 and the vacuum nitrogen connector 14, take the sampling bottle 12 away for testing, open the sampler inlet valve 17, the nitrogen purge valve 2 and the nitrogen control valve to purge the pipeline to avoid sample residue.

Claims

1. A closed sampling device, characterized in that: The invention comprises a sampling bottle (12), wherein the inlet of the sampling bottle (12) is connected to the feed line (19), the outlet of the sampling bottle (12) is connected to the displacement line (21), the feed line (19) is connected in parallel with the circulation line (20), and the feed line (19) is also connected in parallel with the nitrogen line (22).

2. A closed sampling device according to claim 1, characterized in that: The feed line (19) is provided with a sample main pipe feed valve (3), a sample feed control valve (5) and a circulation line valve (11) in sequence according to the fluid flow direction, and a sampler switch valve (7) is provided at the parallel connection between the feed line (19) and the circulation line (20).

3. A closed sampling device according to claim 1, characterized in that: The circulation pipeline (20) is provided with a check valve (6) and a return sample main pipe valve (1) in sequence according to the fluid flow direction.

4. A closed sampling device according to claim 1, characterized in that: The displacement pipeline (21) is provided with a nitrogen displacement valve (9) and a vacuum valve (10), and the nitrogen displacement valve (9) and the vacuum valve (10) are arranged in parallel.

5. A closed sampling device according to claim 1, characterized in that: A nitrogen purge valve (2) and a nitrogen control valve (4) are sequentially arranged on the nitrogen pipeline (22) according to the direction of the gas flow.

6. A closed sampling device according to claim 1, characterized in that: The inlet of the sampling bottle (12) is provided with an inlet sampler valve (17), which is connected to the feed pipeline (19) through the feed connector (13); the outlet of the sampling bottle (12) is provided with an outlet sampler valve (18), which is connected to the displacement pipeline (21) through the vacuum nitrogen connector (14).

7. A closed sampling device according to claim 1, characterized in that: The sampling bottle (12) is also provided with a pressure gauge (8).

8. A closed sampling device according to claim 1, characterized in that: The sampling bottle (12) is a jacket structure, and a temperature control medium outlet (15) and a temperature control medium inlet (16) are provided at the jacket.

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