Sampling device for methanol detection

Abstract

The utility model relates to the technical field of methanol sampling, and particularly discloses a sampling device for methanol detection, which comprises a storage tank, a circulating pipeline is arranged on the storage tank, and a first sampling barrel and a second sampling barrel are arranged on the storage tank. The methanol liquid levels of the second sampling barrel and the first sampling barrel are flush with the liquid inlet end of the telescopic pipe, at the moment, an operator controls the telescopic pipe to ascend and descend, meanwhile, the methanol liquid levels in the first sampling barrel and the second sampling barrel can ascend and descend synchronously, and ascending and descending of the telescopic pipe are stopped until the methanol liquid level in the second sampling barrel reaches the milliliter scale value position of the sampling amount; at the moment, even if methanol is injected into the first sampling barrel all the time, the methanol is discharged from the telescopic pipe, so that the sampling amount is always stable, the problem that the actual sampling amount exceeds the expectation due to the fact that additional methanol still flows into the sampling bottle after the valve is closed during sampling is avoided, and the problem that the sampling amount is not accurate each time due to the fact that the valve is closed according to experience is also solved.

Description

Technical Field

[0001] The utility model relates to the technical field of methanol sampling, and particularly designs a sampling device for methanol detection. Background Art

[0002] In an industrial environment, methanol is a widely used organic solvent and raw material, especially in the fields of chemical industry, pharmaceuticals, fuels, etc. However, as a flammable and toxic chemical substance, its storage, handling and use must strictly comply with safety regulations. Moreover, for industrial processes, ensuring the quality of raw materials is crucial for producing high-quality products. By sampling and detecting methanol, the quality status of methanol can be timely understood, and corresponding measures can be taken.

[0003] In the existing methanol detection and sampling technology, a common practice is to install a sampling valve and a sampling pipe on the pipeline system where methanol flows. When sampling, the operator needs to place a sampling bottle below the outlet of the sampling pipe, and then open the valve to let the methanol in the pipeline flow into the sampling bottle. During this process, the operator must constantly monitor the change of the liquid level in the sampling bottle to ensure obtaining the required amount of sample. After reaching the liquid level, the valve is closed. However, the closing of the valve requires a certain response time, and there is still additional methanol flowing into the bottle after closing, resulting in the actual sampling amount exceeding the expectation. And closing the valve in advance according to experience will result in the sampling amount being lower than expected. This inaccuracy of the sampling amount will directly affect the reliability of the detection result. Based on this, the inventor purposefully provides a sampling device for methanol detection that can automatically control the sampling amount and quickly and accurately complete methanol sampling. Content of the Utility Model

[0004] The purpose of the utility model is to provide a sampling device for methanol detection that can automatically control the sampling amount and quickly and accurately complete methanol sampling for the deficiencies of the prior art, so as to solve the problem that it is difficult to accurately control the methanol sampling amount in the prior art.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A sampling device for methanol detection, which includes a storage tank. A circulation pipeline is arranged on the storage tank. A first sampling cylinder and a second sampling cylinder are arranged on the storage tank. The height of the second sampling cylinder is not less than that of the first sampling cylinder. The first sampling cylinder is communicated with the second sampling cylinder through a connecting pipe. A second valve is arranged on the connecting pipe. The circulation pipeline is communicated with the first sampling cylinder through a sampling pipe. A first valve is arranged on the sampling pipe. The bottom of the second sampling cylinder is communicated with a discharge pipe. A third valve is arranged on the discharge pipe. A telescopic pipe is slidably inserted into the first sampling cylinder, and the telescopic pipe is driven by an electric cylinder to move up and down. The second valve, the first valve, the third valve and the electric cylinder are all connected to an external control box, and the second valve and the first valve are opened synchronously, and the second valve and the third valve are opened asynchronously. The first sampling cylinder and the second sampling cylinder are both made of transparent materials, and milliliter scales are arranged on the outer cylindrical surfaces of the first sampling cylinder and the second sampling cylinder.

[0007] As a further optimization or improvement of this solution.

[0008] The radius of the first sampling cylinder is the same as that of the second sampling cylinder. A compensation rod is arranged in the second sampling cylinder, and the radius of the compensation rod is the same as that of the telescopic pipe.

[0009] As a further optimization or improvement of this solution.

[0010] The movable end of the electric cylinder is connected with a connecting plate, and the connecting plate is connected with the outer cylindrical surface of the telescopic pipe.

[0011] As a further optimization or improvement of this solution.

[0012] A bearing plate is fixedly connected to the outer cylindrical surface of the storage tank. The first sampling cylinder, the second sampling cylinder and the electric cylinder are all installed on the bearing plate.

[0013] As a further optimization or improvement of this solution.

[0014] One end of the telescopic pipe away from the first sampling cylinder is communicated with a reflux cylinder, and the reflux cylinder is communicated with the storage tank, and a one-way valve is arranged at the communicating place between the two.

[0015] The beneficial effects of the present utility model:

[0016] 1. When the present utility model takes a sample, the methanol liquid levels in the second sampling cylinder and the first sampling cylinder are flush with the height of the liquid inlet end of the telescopic pipe. At this time, the operator observes the methanol liquid level in the second sampling cylinder and the milliliter scale on it, and then controls the lifting of the telescopic pipe. At the same time, the methanol liquid levels in the first sampling cylinder and the second sampling cylinder will rise and fall synchronously until the methanol liquid level in the second sampling cylinder reaches the numerical position of the milliliter scale of the sampling volume. Then, stop the lifting of the telescopic pipe. At this time, even if methanol is continuously injected into the first sampling cylinder, it will be discharged from the telescopic pipe, ensuring the stability of the sampling volume all the time, avoiding the problem that extra methanol still flows into the sampling bottle after closing the valve during sampling, resulting in the actual sampling volume exceeding the expectation, and also solving the problem that the sampling volume is inaccurate each time due to closing the valve according to experience.

[0017] 2. The present utility model sets the radius of the first sampling cylinder to be the same as that of the second sampling cylinder, and the radius of the compensation rod and the telescopic pipe to be the same. When the methanol in the first sampling cylinder enters the telescopic pipe through the connecting pipe, not only the liquid levels are consistent, but the methanol volume in the telescopic pipe is always the same as that in the first sampling cylinder. That is, the value corresponding to the alignment of the liquid inlet end of the telescopic pipe with the milliliter scale on the first sampling cylinder is the finally sampled sampling volume. In this way, before sampling methanol, the operator can adjust the height of the telescopic pipe through the electric cylinder according to the sampling volume, so that the liquid inlet end of the telescopic pipe is aligned with the milliliter scale on the first sampling cylinder, and then perform the sampling operation to obtain the expected sampling volume, without the need to adjust the height of the telescopic pipe during sampling and observe the liquid level height in the second sampling cylinder, further simplifying the sampling operation, reducing the sampling time, and still ensuring the sampling accuracy.

[0018] 3. In the present utility model, the methanol passes through the telescopic pipe and is discharged into the reflux cylinder. Then, open the one-way valve on the reflux cylinder to re - transport the methanol in the reflux cylinder back to the storage tank. The reflux cylinder is set to temporarily store the methanol discharged from the telescopic pipe, avoiding the situation that the methanol in the telescopic pipe flows too much, causing the liquid level to rise and flow back into the first sampling cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further describes the present utility model with reference to the drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0021] Figure 2 It is a schematic diagram of the connection structure between the first sampling cylinder and the second sampling cylinder of the present utility model.

[0022] Figure 3 For the present utility model Figure 2 Schematic cross - sectional structure diagram.

[0023] The labels in the figure are as follows:

[0024] 1. Storage tank; 2. Circulation pipeline; 3. First sampling cylinder; 4. Telescopic pipe; 5. Second sampling cylinder; 6. Compensation rod; 7. Connecting pipe; 8. Second valve; 9. Sampling pipe; 10. First valve; 11. Discharge pipe; 12. Third valve; 13. Bearing plate; 14. Electric cylinder; 15. Connecting plate; 16. Return cylinder. Detailed implementation manner

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the protection scope of the present invention.

[0026] See Figures 1 - 3 , a sampling device for methanol detection, which includes a storage tank 1. A circulation pipeline 2 is arranged on the storage tank 1. A first sampling cylinder 3 and a second sampling cylinder 5 are arranged on the storage tank 1. The height of the second sampling cylinder 5 is not less than that of the first sampling cylinder 3. The first sampling cylinder 3 is communicated with the second sampling cylinder 5 through a connecting pipe 7. A second valve 8 is arranged on the connecting pipe 7. The circulation pipeline 2 is communicated with the first sampling cylinder 3 through a sampling pipe 9. A first valve 10 is arranged on the sampling pipe 9. The bottom of the second sampling cylinder 5 is communicated with a discharge pipe 11. A third valve 12 is arranged on the discharge pipe 11. A telescopic pipe 4 is slidably inserted into the first sampling cylinder 3, and the telescopic pipe 4 is driven by an electric cylinder 14 to move up and down. The second valve 8, the first valve 10, the third valve 12 and the electric cylinder 14 are all connected to an external control box, and the second valve 8 and the first valve 10 are opened synchronously, and the second valve 8 and the third valve 12 are opened asynchronously. Both the first sampling cylinder 3 and the second sampling cylinder 5 are made of transparent materials, and milliliter scales are arranged on the outer circumferential surfaces of the first sampling cylinder 3 and the second sampling cylinder 5.

[0027] In a specific embodiment, it should be noted that the external control box, the second valve 8, the first valve 10, the third valve 12 and the electric cylinder 14 described in this application are all prior arts, and this application has not improved them. Therefore, it is not necessary to disclose their specific mechanical structures and circuit structures, which does not affect the integrity of this application.

[0028] The working principle of the utility model is as follows: Methanol flows in the circulation pipeline 2. When sampling is required, first, the third valve 12 is controlled to close and the second valve 8 and the first valve 10 are opened through an external control box. At this time, the methanol in the circulation pipeline 2 flows into the first sampling cylinder 3 through the sampling pipe 9. Due to the principle of communicating vessels, the methanol in the first sampling cylinder 3 flows into the second sampling cylinder 5 through the connecting pipe 7. Since the height of the second sampling cylinder 5 is not lower than that of the first sampling cylinder 3, the methanol liquid levels in the second sampling cylinder 5 and the first sampling cylinder 3 are always flush. At the initial stage of sampling, the methanol liquid levels in the second sampling cylinder 5 and the first sampling cylinder 3 will continuously rise. Once the methanol liquid level in the first sampling cylinder 3 is higher than the liquid inlet end height of the telescopic pipe 4, the excess methanol will be discharged from the first sampling cylinder 3 through the telescopic pipe 4, making the methanol liquid levels in the second sampling cylinder 5 and the first sampling cylinder 3 flush with the liquid inlet end height of the telescopic pipe 4. At this time, the operator observes the methanol liquid level in the second sampling cylinder 5 and the milliliter scale value on the second sampling cylinder 5, and then controls the telescopic movement of the electric cylinder 14 through the external control box to drive the telescopic pipe 4 to rise and fall. At the same time, the methanol liquid levels in the first sampling cylinder 3 and the second sampling cylinder 5 will rise and fall synchronously until the methanol liquid level in the second sampling cylinder 5 reaches the milliliter scale value position of the sampling volume. Then, the external control box controls the second valve 8 and the first valve 10 to close. The operator aligns the sampling bottle mouth with the discharge pipe 11 and then opens the third valve 12. The methanol sample in the second sampling cylinder 5 flows into the sampling bottle through the discharge pipe 11, and at this time, the sampling operation is completed.

[0029] This structure temporarily stores the methanol sample through the second sampling cylinder 5. Even if the first valve 10 is always open and methanol is continuously injected into the first sampling cylinder 3, the excess methanol will be discharged through the telescopic pipe 4, ensuring the stability of the sampling volume at all times. As long as the position of the telescopic pipe 4 is adjusted properly, the sample volume of methanol taken each time can be ensured to be consistent, avoiding the problem that extra methanol still flows into the sampling bottle after the valve is closed during sampling, resulting in the actual sampling volume exceeding the expected value, and also solving the problem that the sampling volume is inaccurate each time due to closing the valve according to experience.

[0030] Specifically, the radius of the first sampling cylinder 3 is the same as that of the second sampling cylinder 5. A compensation rod 6 is arranged in the second sampling cylinder 5, and the radius of the compensation rod 6 is the same as that of the telescopic pipe 4.

[0031] In a specific embodiment, since the radius of the first sampling cylinder 3 is the same as that of the second sampling cylinder 5, and the radius of the compensation rod 6 is the same as that of the telescopic tube 4, when the methanol in the first sampling cylinder 3 enters the telescopic tube 4 through the connecting pipe 7, not only is the liquid level consistent, but the volume of methanol in the telescopic tube 4 is always the same as that in the first sampling cylinder 3. That is, the value where the liquid inlet end of the telescopic tube 4 aligns with the milliliter scale on the first sampling cylinder 3 is the finally sampled amount. In this way, before sampling methanol, the operator can adjust the height of the telescopic tube 4 according to the sampled amount through the electric cylinder 14, so that the liquid inlet end of the telescopic tube 4 aligns with the milliliter scale on the first sampling cylinder 3, and then perform the sampling operation to obtain the expected sampled amount, without the need to adjust the height of the telescopic tube 4 during sampling and observe the liquid level height in the second sampling cylinder 5, which further simplifies the sampling operation, reduces the sampling time, and still ensures the sampling accuracy.

[0032] More specifically, the movable end of the electric cylinder 14 is connected with a connecting plate 15, and the connecting plate 15 is connected with the outer cylindrical surface of the telescopic tube 4.

[0033] In a specific embodiment, the telescopic tubes 4 are connected together through the connecting plate 15. When the electric cylinder 14 expands and contracts, it will drive the connecting plate 15 to rise and fall, and then drive the telescopic tubes 4 to rise and fall in the first sampling cylinder 3, thereby adjusting the sampled amount.

[0034] At the same time, it should be noted that a bearing plate 13 is fixedly connected to the outer cylindrical surface of the storage tank 1, and the first sampling cylinder 3, the second sampling cylinder 5, and the electric cylinder 14 are all installed on the bearing plate 13.

[0035] In a specific embodiment, the first sampling cylinder 3, the second sampling cylinder 5, and the electric cylinder 14 are all installed on the bearing plate 13 to form an integrated installation, which facilitates the installation and disassembly of the entire sampling device.

[0036] More specifically, one end of the telescopic tube 4 far from the first sampling cylinder 3 is communicated with a return cylinder 16, and the return cylinder 16 is communicated with the storage tank 1, and a one-way valve is provided at the communication part between the two.

[0037] In a specific embodiment, it should be noted that the one-way valve described in this application is a prior art, and this application has not improved them. Therefore, it is not necessary to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of this application; the methanol passing through the telescopic tube 4 will be discharged into the return cylinder 16, and then the one-way valve on the return cylinder 16 is opened to re - transport the methanol in the return cylinder 16 back to the storage tank 1. The setting of the return cylinder 16 is to temporarily store the methanol discharged from the telescopic tube 4 to avoid the situation where the methanol flowing in the telescopic tube 4 is too much, causing the liquid level to rise and flow back into the first sampling cylinder 3.

[0038] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A sampling device for methanol detection, characterized in that: The invention comprises a storage tank (1), wherein a circulation pipeline (2) is arranged on the storage tank (1), a first sampling cylinder (3) and a second sampling cylinder (5) are arranged on the storage tank (1), the height of the second sampling cylinder (5) is not less than the height of the first sampling cylinder (3), the first sampling cylinder (3) is connected with the second sampling cylinder (5) through a connecting pipe (7), a second valve (8) is arranged on the connecting pipe (7), the circulation pipeline (2) is connected with the first sampling cylinder (3) through a sampling pipe (9), a first valve (10) is arranged on the sampling pipe (9), the bottom of the second sampling cylinder (5) is connected with a discharge pipe (11), and a valve (11) is arranged on the discharge pipe (11). A third valve (12) is provided, a telescopic tube (4) is slidably inserted in the first sampling tube (3), and the telescopic tube (4) is driven by an electric cylinder (14) to perform lifting and lowering movements, the second valve (8), the first valve (10), the third valve (12) and the electric cylinder (14) are all connected to an external control box, and the second valve (8) and the first valve (10) are opened synchronously, and the second valve (8) and the third valve (12) are opened asynchronously, the first sampling tube (3) and the second sampling tube (5) are both made of transparent materials, and milliliter scales are provided on the outer circumferential surfaces of the first sampling tube (3) and the second sampling tube (5).

2. A sampling device for methanol detection according to claim 1, characterized in that: The radius of the first sampling cylinder (3) is the same as the radius of the second sampling cylinder (5); a compensation rod (6) is arranged in the second sampling cylinder (5); and the radius of the compensation rod (6) is the same as the radius of the telescopic tube (4).

3. A sampling device for methanol detection according to claim 1, characterized in that: The movable end of the electric cylinder (14) is connected to a connecting plate (15), and the connecting plate (15) is connected to the outer circumferential surface of the telescopic tube (4).

4. A sampling device for methanol detection according to claim 3, characterized in that: The outer circumferential surface of the storage tank (1) is fixedly connected to a bearing plate (13), and the first sampling cylinder (3), the second sampling cylinder (5) and the electric cylinder (14) are all mounted on the bearing plate (13).

5. A sampling device for methanol detection according to claim 1, characterized in that: The end of the telescopic tube (4) away from the first sampling tube (3) is connected to the reflux tube (16), the reflux tube (16) is connected to the storage tank (1), and a one-way valve is provided at the connection point between the two.

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