Liquid vacuum sampling device

Abstract

The utility model discloses a kind of liquid vacuum sampling devices, including flange connection sight glass, vacuum pipeline, nitrogen pipeline, pressure gauge, sampling pipeline and sampling pipeline;The upper end of the flange connection sight glass is equipped with upper interface, and lower end is equipped with lower interface, the upper interface of the flange connection sight glass is connected vacuum pipeline, nitrogen pipeline and pressure gauge simultaneously by a tee joint, the lower interface of the flange connection sight glass is connected sampling pipeline and the sampling pipeline simultaneously;The utility model adds nitrogen pipeline, vacuum is extracted through vacuum pipeline before sampling, nitrogen is filled after sampling Pressure, both can avoid operator and dangerous material direct contact, prevent toxic and harmful substance volatilization leakage, can also maintain the inert atmosphere in the sampling kettle to be taken, avoid air into leading material oxidation, deterioration, solve the problem that container atmosphere is easily destroyed in prior art.

Description

Technical Field

[0001] This utility model belongs to the technical field of industrial liquid sampling, specifically relating to a liquid vacuum sampling device. Background Technology

[0002] In industrial production, extracting liquid samples from sealed pressure vessels for quality testing is a crucial step in ensuring product quality. Traditional sampling methods, often involving direct open sampling, have significant drawbacks: First, they are unsafe. For flammable, explosive, toxic, or hazardous materials, open sampling can easily lead to material volatilization and leakage, causing safety accidents, environmental pollution, and health risks to personnel. Second, materials are easily damaged and contaminated. Opening the container can cause leakage of inert protective gases (such as nitrogen), disrupting the internal atmosphere. At the same time, oxygen and moisture from the air may enter the container, leading to oxidation and deterioration of the material. Third, the operation is cumbersome. For systems that need to maintain a specific pressure, the process of restoring pressure after sampling is complex.

[0003] While some closed samplers exist in the existing technology, such as the "device for vacuum sampling of liquid materials in a closed container" with announcement number CN215640355U, which uses components such as a transparent cylinder, vacuum tube, and venting pipe in conjunction with a control console to control valves to achieve vacuum sampling, although it can ensure production continuity, it does not have an inert gas protection system. When restoring the container atmosphere after sampling, it is easily affected by air, and there is no special treatment structure designed for residual materials in the pipeline, which may lead to cross-contamination of samples and waste of materials.

[0004] Another patent, CN204903225U, discloses a "liquid sampling device under vacuum conditions." It uses a sampling tank and multiple valves to complete the sampling, and excess liquid can be returned to the system. However, it also lacks an inert gas protection mechanism and cannot maintain an inert atmosphere inside the container. Furthermore, pressure monitoring during the sampling process relies on an observation window and is not equipped with a precise pressure gauge, making it difficult to accurately control the sampling pressure, which may affect the sampling accuracy. At the same time, it does not solve the problem of thoroughly cleaning residual materials in the pipeline.

[0005] In summary, existing closed sampling devices generally suffer from problems such as lack of inert atmosphere protection, easy cross-contamination caused by pipeline residues, and insufficient pressure control accuracy. There is an urgent need for a sampling device that can overcome the above defects. Utility Model Content

[0006] The present invention aims to overcome the shortcomings of the prior art and provide a liquid vacuum sampling device that is simple in structure, low in manufacturing cost, easy to operate, highly safe, and has precise pressure control, and can achieve inert atmosphere protection and residue-free sampling.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a liquid vacuum sampling device, comprising a flange-connected sight glass, a vacuum pipe, a nitrogen pipe, a pressure gauge, a sampling pipe, and a sampling tube.

[0008] Preferably, the flange-connected sight glass is a hollow cavity made of transparent material, which facilitates observation of the internal liquid level and sample status. Its nominal diameter is DN100, and it has an upper interface and a lower interface at the upper and lower ends, respectively. Both the upper and lower interfaces are connected by flanges, which facilitates disassembly and maintenance.

[0009] Preferably, the upper interface is connected to the vacuum pipeline, nitrogen pipeline and pressure gauge simultaneously through a T-connector, wherein the pressure gauge has a range of -0.1MPa to 0.3MPa, which can accurately monitor the pressure changes in the sight glass and provide data support for pressure control during the sampling process.

[0010] Preferably, the lower interface connects one end of the sampling pipe and the sampling tube simultaneously. The end of the sampling pipe away from the sight glass extends to the bottom of the vessel to be sampled, ensuring that a representative liquid sample can be extracted from the vessel. The outlet end of the sampling tube is bent downward to form a sampling port with the elbow facing downward, which facilitates safe sample collection and avoids sample spillage during the sampling process.

[0011] Preferably, the vacuum pipeline, nitrogen pipeline, sampling pipeline, and extraction pipeline are all DN15 pipelines, and each pipeline is equipped with a ball valve for controlling the on / off state. These are a first ball valve for controlling the vacuum pipeline, a second ball valve for controlling the nitrogen pipeline, a third ball valve for controlling the sampling pipeline, and a fourth ball valve for controlling the extraction pipeline. The sampling and extraction operations are achieved through the combination of switching the ball valves.

[0012] Compared with the prior art, the present invention provides a liquid vacuum sampling device, which has the following beneficial effects: 1. This utility model adds a nitrogen pipeline. Before sampling, a vacuum is drawn through the vacuum pipeline, and after sampling, nitrogen is used to pressurize. This can not only avoid direct contact between operators and hazardous materials and prevent the volatilization and leakage of toxic and harmful substances, but also maintain the inert atmosphere in the sample container to prevent air from entering and causing the material to oxidize and deteriorate. This solves the problem that the container atmosphere is easily destroyed in the prior art. 2. This utility model uses nitrogen gas to force the material remaining in the sampling pipe back into the reactor through the sample removal operation, which saves materials, completely avoids cross-contamination between different samples, and ensures unobstructed pipe flow, thus solving the pollution problem caused by pipe residue in the prior art. 3. This utility model is equipped with a pressure gauge with a range of -0.1MPa to 0.3MPa, which can accurately monitor the pressure inside the sight glass in real time, ensuring that the pressure during the vacuuming and nitrogen filling process meets the process requirements, and improving the sampling accuracy and stability; 4. The sight glass in this utility model is made of transparent material and has a nominal diameter of DN100. Compared with the smaller observation window in the prior art, it can more clearly observe the sample liquid level and state (such as color, whether it contains impurities, etc.). At the same time, the sampling process can be completed by a simple combination of four ball valves. The operation steps are clear and there is no need for a complicated control console or additional vacuum balancing equipment, which reduces the difficulty of operation and equipment cost. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a liquid vacuum sampling device proposed in this utility model; In the diagram: 1. Flange connection sight glass; 2. Tee connector; 3. Vacuum pipeline; 4. First ball valve; 5. Nitrogen pipeline; 6. Second ball valve; 7. Pressure gauge; 8. Sampling pipeline; 9. Third ball valve; 10. Sampling pipeline; 11. Fourth ball valve; 12. Sampling port. Detailed Implementation

[0014] 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.

[0015] Please see Figure 1 This utility model provides a liquid vacuum sampling device, including a flange-connected sight glass 1, a vacuum pipe 3, a nitrogen pipe 5, a pressure gauge 7, a sampling pipe 8, and a sampling pipe 10; The flange connection cup 1 is a hollow cavity, with an upper interface and a lower interface at its upper and lower ends, respectively. The upper interface is connected to the vacuum pipe 3, the nitrogen pipe 5 and the pressure gauge 7 simultaneously through a T-connector 2; The lower interface is connected to one end of the sampling pipe 8 and the sampling pipe 10; The vacuum pipeline 3, nitrogen pipeline 5, sampling pipeline 8 and sampling pipe 10 are all equipped with ball valves for controlling the on and off states. The ball valves include a first ball valve 4 on the vacuum pipeline 3, a second ball valve 6 on the nitrogen pipeline 5, a third ball valve 9 on the sampling pipeline 8 and a fourth ball valve 11 on the sampling pipe 10.

[0016] Furthermore, the flange-connected sight glass 1 is a flange-connected DN100 sight glass, and its body is made of transparent material to facilitate observation of the internal liquid level.

[0017] Furthermore, the vacuum pipe 3, nitrogen pipe 5, sampling pipe 8, and sampling pipe 10 are all DN15 pipes.

[0018] Furthermore, the pressure gauge 7 has a range of -0.1MPa to 0.3MPa, and is used to accurately monitor pressure changes within the sight glass.

[0019] Furthermore, the end of the sampling pipe 8 away from the flange connection sight glass 1 extends deep into the bottom of the sample container.

[0020] Furthermore, the outlet end of the sampling pipe 10 is bent downwards to form a sampling port 12 with the elbow facing downwards, which facilitates safe receipt of the sample.

[0021] The working principle and usage process of this utility model are as follows: Initially, confirm that all valves (first ball valve 4, second ball valve 6, third ball valve 9, and fourth ball valve 11) are closed, ensuring that there is no connection between the device and the sample container, and pressure gauge 7 shows an initial pressure-free state.

[0022] Step 1, Sampling (vacuum aspiration): 1. Open the first ball valve 4 on the vacuum pipeline 3 and the third ball valve 9 on the sampling pipeline 8 to connect the vacuum pipeline 3 and the sampling pipeline 8; 2. Start the vacuum equipment. Under vacuum negative pressure, the vacuum pipe 3, tee joint 2, and flange connection sight glass 1 act on the sampling pipe 8, thereby generating suction on the liquid in the vessel to be sampled. Under negative pressure, the liquid enters the flange connection sight glass 1 through the sampling pipe 8. 3. The operator observes the internal liquid level through the transparent flange connected to the sight glass 1. When the sample liquid level reaches about half of the sight glass 1, first close the third ball valve 9 to cut off the connection between the sampling pipe 8 and the sight glass, then close the first ball valve 4 to stop the vacuuming operation. At this time, the pressure gauge 7 shows that the sight glass is under negative pressure.

[0023] Step 2, Sampling (Nitrogen-filled and depressurized sampling): 1. Open the second ball valve 6 on the nitrogen pipeline 5. Nitrogen gas enters the flange connection sight glass 1 through the tee connector 2. The operator observes the pressure gauge 7. When the pressure shows normal pressure (0MPa), close the second ball valve 6 to stop the nitrogen charging. 2. Place the sample bottle directly below the sampling port 12, open the fourth ball valve 11 on the sampling pipe 10, and the sample in the sight glass 1 connected to the flange flows into the sample bottle from the sampling port 12 through the sampling pipe 10 under the action of gravity. 3. Once a sufficient amount of sample has been obtained, close the fourth ball valve 11 to complete the sampling.

[0024] Step 3, Sample removal (purge and reset): 1. Keep the fourth ball valve 11 closed, and open the third ball valve 9 again to connect the sampling pipe 8 with the flange connection sight glass 1; 2. Open the second ball valve 6, fill the flange connection sight glass 1 with nitrogen, adjust the nitrogen inlet flow rate, observe the pressure gauge 7, and stabilize the pressure at 0.05MPa; 3. Under pressure, nitrogen gas pushes the residual material in the flange connection sight glass 1 and the sampling pipe 8 back into the sample container through the sampling pipe 8, and continues to purge for about 1 minute to ensure that there is no material residue in the pipe. 4. First, close the second ball valve 6 to stop nitrogen charging, then close the third ball valve 9. At this point, the device returns to its initial state, all valves are closed, and one complete sampling cycle is completed.

[0025] 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 liquid vacuum sampling device, characterized in that, It includes a flange-connected sight glass (1), a vacuum pipe (3), a nitrogen pipe (5), a pressure gauge (7), a sampling pipe (8), and a sampling pipe (10); the flange-connected sight glass (1) has an upper interface at the upper end and a lower interface at the lower end. The upper interface of the flange-connected sight glass (1) is connected to the vacuum pipe (3), the nitrogen pipe (5), and the pressure gauge (7) through a tee connector (2). The lower interface of the flange-connected sight glass (1) is connected to the sampling pipe (8) and the sampling pipe (10); the vacuum pipe (3), the nitrogen pipe (5), the sampling pipe (8), and the sampling pipe (10) are respectively equipped with a first ball valve (4), a second ball valve (6), a third ball valve (9), and a fourth ball valve (11) to control their opening and closing.

2. The liquid vacuum sampling device according to claim 1, characterized in that: The flange connection cup (1) is a flange connection cup with a cylinder made of transparent material, and its upper and lower interfaces are connected by flanges.

3. The liquid vacuum sampling device according to claim 1, characterized in that: The nominal diameter of the flange connection cup (1) is DN100; the nominal diameters of the vacuum pipe (3), nitrogen pipe (5), sampling pipe (8) and sampling pipe (10) are all DN15.

4. A liquid vacuum sampling device according to claim 1, characterized in that: The pressure gauge (7) has a range of -0.1 MPa to 0.3 MPa.

5. A liquid vacuum sampling device according to claim 1, characterized in that: The end of the sampling pipe (8) away from the flange connection sight glass (1) is used to penetrate deep into the bottom of the vessel to be sampled.

6. A liquid vacuum sampling device according to claim 1, characterized in that: The sampling pipe (10) bends downward away from the outlet end of the flange connection sight glass (1) to form a sampling port (12) with the bend facing downward.

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