A stirred tank sampling device

Abstract

The application relates to a stirred tank sampling device, which comprises a stirred tank, a diaphragm pump, a feeding pipeline, a back feeding pipeline and a sampling valve. The diaphragm pump comprises a feeding port and a discharging port, the feeding pipeline comprises a sampling end, a suction end and a sampling port arranged between the sampling end and the suction end, the sampling end extends into material in the stirred tank, and the suction end is connected with the feeding port of the diaphragm pump. One end of the back feeding pipeline is connected with the discharging port of the diaphragm pump, and the other end is connected to the stirred tank, and the sampling valve is connected with the sampling port of the feeding pipeline. The stirred tank sampling device can realize cyclic sampling and self-cleaning of the cyclic sampling pipeline, improve the representativeness of the sampling sample, reduce the pollution risk and improve the sampling efficiency.

Description

Technical Field

[0001] This application relates to the field of stirred tank sampling technology, specifically to a stirred tank sampling device. Background Technology

[0002] In the fields of chemical, pharmaceutical, and food industries, stirred tanks are core production equipment. Sampling and monitoring of material parameters are necessary to ensure product quality and process safety, but existing sampling methods have significant drawbacks.

[0003] Currently, the mainstream sampling methods fall into two categories: The first is manual sampling, where materials are manually obtained through a fixed sampling port on the vessel. This method is prone to poor sample representativeness due to uneven material distribution within the vessel, and manual sampling may also lead to material contamination or safety risks for operators. The second is simple mechanical sampling, which uses a fixed pipeline connecting the vessel and the sampling valve, relying on pressure or gravity within the vessel to extract the material. However, it still has core problems: firstly, air or residual material can easily accumulate in the pipeline, resulting in insufficient sample accuracy; secondly, residual material can easily dry and clog the pipeline, requiring manual disassembly and cleaning, which is cumbersome and prone to cross-contamination. Utility Model Content

[0004] The purpose of this application is to provide a stirred tank sampling device that can perform cyclic sampling and self-cleaning of the cyclic sampling pipeline, thereby improving the representativeness of the sampled samples, reducing the risk of contamination, and increasing sampling efficiency.

[0005] This application provides a sampling device for a stirred tank, comprising a stirred tank, a diaphragm pump, a feed pipeline, a return pipeline, and a sampling valve. The diaphragm pump includes an inlet and an outlet. The feed pipeline includes a sampling end, a suction end, and a sampling port disposed between the sampling end and the suction end. The sampling end extends into the material inside the stirred tank, and the suction end is connected to the inlet of the diaphragm pump. One end of the return pipeline is connected to the outlet of the diaphragm pump, and the other end is connected to the stirred tank. The sampling valve is connected to the sampling port of the feed pipeline.

[0006] In one feasible embodiment, the feed line section inside the mixing vessel is positioned close to the inner wall of the mixing vessel.

[0007] In one feasible approach, a transparent sight glass section is installed at the front end of the sampling port of the feed line.

[0008] In one feasible solution, a first switching valve is installed at one end of the return pipeline near the mixing vessel, a discharge port is installed between the first switching valve and the discharge port, and a second switching valve is installed at the discharge port.

[0009] In one feasible approach, a main switch valve is installed between the end of the feed line near the mixing vessel and the sampling port.

[0010] In one feasible embodiment, the sampling end of the feed line is configured to have an adjustable height within the mixing vessel.

[0011] In one feasible embodiment, the feed pipeline includes a rigid straight pipe, a sampling port is provided on the mixing vessel, and a sliding groove is provided on the inner side wall of the mixing vessel. The sliding groove is located below the sampling port and the axial direction of the sliding groove is consistent with that of the sampling port. The rigid straight pipe passes through the sampling port and the sliding groove in sequence, and the rigid straight pipe and the sampling port are configured with an assembly structure having a locked state and a released state.

[0012] In one feasible embodiment, the sampling port is provided with a through hole for the passage of a rigid straight pipe. The through hole includes a tapered section and a threaded section located on the upper side of the tapered section. The larger diameter end of the tapered section is on top, and the smaller diameter end is on the bottom. The diameter of the larger diameter end of the tapered section is not greater than the diameter of the threaded section. The sampling device of the stirred tank also includes a tapered sealing ring and a tightening ring. The shape of the tapered sealing ring is adapted to the shape of the tapered section. The tapered sealing ring is fitted onto the rigid straight pipe and is located within the tapered section. The tightening ring is provided with external threads. The tightening ring is fitted onto the rigid straight pipe and is threadedly engaged with the threaded section to press the tapered sealing ring.

[0013] In one feasible embodiment, the outer surface of the rigid straight tube is provided with graduations for indicating the depth of insertion into the mixing vessel.

[0014] Compared with existing technologies, the technical solution of this application has at least the following beneficial effects: This application constructs a closed-loop flow channel connected to the inside of the stirred tank through a diaphragm pump, a feed pipeline, and a return pipeline. This enables both cyclic sampling and self-cleaning of the cyclic sampling pipeline. Circulation sampling avoids the problems of interference from stagnant material and limited local sampling in traditional single-pass sampling. The sample accurately reflects the overall state of the material inside the stirred tank, solving the problem of sample deviation misleading process adjustments. Furthermore, it eliminates the need for manual disassembly of the pipeline or the addition of cleaning media, achieving online self-cleaning through material self-circulation, saving cleaning time for the sampling pipeline, and avoiding the risk of contamination during disassembly, thus solving the problems of cumbersome cleaning and residual contamination. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a stirred tank sampling device provided in an embodiment of this application; Figure 2 A schematic diagram of the overall structure of another stirred tank sampling device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the feed pipeline inside the reactor provided in the embodiments of this application; Figure 4 A schematic diagram of a vertical cross-section along a rigid straight pipe provided for an embodiment of this application; Figure 5An exploded structural diagram of the rigid straight pipe and sampling port provided in an embodiment of this application; Figure 6 for Figure 4 Enlarged view of the structure at point A in the diagram.

[0016] In the diagram: 1. Stirring vessel; 11. Sampling port; 111. Through hole; 112. Conical hole section; 113. Threaded hole section; 12. Sliding groove; 2. Diaphragm pump; 21. Inlet; 22. Outlet; 3. Inlet pipeline; 31. Sampling end; 32. Suction end; 33. Sampling port; 34. Main switch valve; 301. Rigid straight pipe; 302. Scale line; 4. Return pipeline; 41. First switch valve; 42. Discharge port; 43. Second switch valve; 5. Sampling valve; 6. Sight glass section; 7. Conical sealing ring; 8. Tightening ring. Detailed Implementation

[0017] The following detailed description of the technical solution of this application will further illustrate the specific implementation of the technical solution of this application. However, it should be noted that the specific implementation is only a specific implementation and explanation of the essence of the technical solution of this application and should not be construed as a limitation on the scope of protection of this application.

[0018] like Figure 1 As shown, this embodiment provides a sampling device for a stirred tank, including a stirred tank 1, a diaphragm pump 2, a feed pipeline 3, a return pipeline 4, and a sampling valve 5.

[0019] The diaphragm pump 2 includes an inlet 21 and an outlet 22. The feed line 3 includes a sampling end 31, a suction end 32, and a sampling port 33 located between the sampling end 31 and the suction end 32. The sampling end 31 extends into the material inside the mixing vessel 1, and the suction end 32 is connected to the inlet 21 of the diaphragm pump 2. One end of the return line 4 is connected to the outlet 22 of the diaphragm pump 2, and the other end is connected to the mixing vessel 1. The sampling valve 5 is connected to the sampling port 33 of the feed line 3.

[0020] In this embodiment, a closed-loop flow channel is formed by diaphragm pump 2, feed pipeline 3, and return pipeline 4, which is connected to the inside of the mixing vessel 1.

[0021] During sampling, the diaphragm pump 2 is the core power source. Its inlet 21 is connected to the suction end 32 of the feed pipe 3, and its outlet 22 is connected to the return pipe 4. The return pipe 4 is connected back to the mixing vessel 1, forming a closed-loop circulation path in which the material in the mixing vessel 1 passes through the feed pipe 3, the diaphragm pump 2, and the return pipe 4 in sequence, and finally returns to the mixing vessel 1.

[0022] Because the feed pipeline 3 has a sampling port 33 and a sampling valve 5 between the sampling end 31 and the suction end 32, after the diaphragm pump 2 is started, the material in the stirred tank 1 will continuously circulate along the closed loop. At this time, by opening the sampling valve 5, the material flowing in real time can be extracted from the circulation channel. Because the material is in a dynamic circulation state, it can prevent air or residual old material from being trapped in the pipeline and mixed into the sample.

[0023] Furthermore, whether it's pipeline pretreatment before sampling or residue cleaning after sampling, simply keeping the diaphragm pump 2 running allows the material in the stirred tank 1 to continuously circulate along the feed pipe 3 and return pipe 4. The flowing material will flush the inner walls of the pipes, carrying away any residual material (such as sticky or crystalline materials) that may be adhering to the sampling port 33 and the inner wall of the feed pipe 3, and returning it to the stirred tank 1 through the return pipe 4, preventing residual material from drying out and clogging the pipes or contaminating the next sample. At the same time, the circulation process can drive the flow of material in different areas of the stirred tank 1, ensuring that the sampling end 31 continuously contacts the entire material in the tank, rather than just a localized static material.

[0024] Furthermore, the closed-loop flow channel covers the entire sampling-related pipeline, including the entire feed pipeline 3, the entire return pipeline 4, and the internal flow channel of the diaphragm pump 2. During material circulation, it can thoroughly flush all contact inner walls. Compared with the shortcomings of traditional fixed pipelines that can only clean local areas, it achieves self-cleaning of the entire flow channel of the sampling system.

[0025] In summary, the sampling device for the stirred tank in this embodiment can achieve both cyclic sampling and self-cleaning of the cyclic sampling pipeline. Specifically, cyclic sampling avoids the problems of interference from stagnant material and limited local sampling in traditional single-pass sampling. The sample can truly reflect the overall state of the material in the stirred tank 1, solving the problem of sample deviation misleading process adjustments. Furthermore, it eliminates the need for manual disassembly of the pipeline or addition of cleaning media, achieving online self-cleaning through material self-circulation, saving cleaning time for the sampling pipeline, and avoiding the risk of contamination during disassembly, thus solving the problems of cumbersome cleaning and residual contamination.

[0026] In some embodiments, such as Figure 1 As shown, the section of the feed pipe 3 inside the mixing vessel 1 is set close to the inner wall of the mixing vessel 1, so that the mixing structure in the mixing vessel 1 will not interfere with the sampling end 31 of the feed pipe 3.

[0027] Therefore, during the entire cyclic sampling and cleaning process, since the stirring structure in the mixing vessel 1 and the portion of the feed pipe 3 located in the mixing vessel 1 do not interfere with each other, the mixing vessel 1 can maintain a normal stirring state. This allows materials from different locations within the mixing vessel 1 to be obtained from the sampling port 33, improving the accuracy of sampling and testing. Simultaneously, because the closed-loop flow channel is an independently connected external structure, the power circulation of the diaphragm pump 2 does not affect the mixing or reaction of materials within the mixing vessel 1, and sampling can be completed without pausing stirring. This enables continuous cyclic sampling and cleaning, thus minimizing the problems caused by production interruptions.

[0028] In some embodiments, such as Figure 2 As shown, a transparent sight glass section 6 is provided at the front end of the sampling port 33 of the feed pipe 3 to facilitate observation of the material circulation.

[0029] In some embodiments, such as Figure 2 As shown, a first switching valve 41 can be installed on one end of the return pipeline 4 near the mixing vessel 1, and a discharge port 42 can be installed between the first switching valve 41 and the discharge port 22, and a second switching valve 43 is installed on the discharge port 42.

[0030] Specifically, if there is contamination in the pipeline, directly returning the cleaned material to the mixing tank 1 during cleaning will cause contamination of the material in the mixing tank 1. Therefore, during overall pipeline cleaning, the first switch valve 41 can be closed and the second switch valve 43 opened. The diaphragm pump 2 can be used to draw material to flush the feed pipeline 3, the internal cavity of the diaphragm pump 2, and the return pipeline 4, and then the material can be discharged through the discharge port 42 to remove the cleaning waste. Afterward, the first switch valve 41 can be opened again and the second switch valve 43 closed.

[0031] In some embodiments, such as Figure 2 As shown, a main switch valve 34 can be installed between the end of the feed pipeline 3 near the mixing vessel 1 and the sampling port 33.

[0032] In some embodiments, such as Figure 1 As shown, the connection between the feed pipe 3 and the mixing vessel 1, as well as the connection between the return pipe 4 and the mixing vessel 1, can all be sealed to maintain the sealed environment of the mixing vessel 1.

[0033] In some embodiments, the sampling end 31 of the feed line 3 is configured to have an adjustable height within the mixing vessel 1.

[0034] For example, different height snap-fit ​​structures can be configured on the inner wall of the mixing vessel 1, and the sampling end 31 of the feed pipe 3 can be snapped onto the snap-fit ​​structures of different heights to achieve height adjustment of the sampling end 31 of the feed pipe 3. However, this adjustment structure requires stopping the machine for adjustment.

[0035] Preferably, in some embodiments, the sampling end 31 of the feed pipe 3 is configured to be height-adjustable within the mixing vessel 1, and height adjustment can be achieved without stopping the machine.

[0036] Specifically, such as Figure 3 and Figure 4 As shown, the feed pipe 3 may include a rigid straight pipe 301. A sampling port 11 is provided on the mixing vessel 1. A sliding groove 12 is provided on the inner side wall of the mixing vessel 1. The sliding groove 12 is located below the sampling port 11, and the axial direction of the sliding groove 12 is consistent with that of the sampling port 11. The rigid straight pipe 301 passes through the sampling port 11 and the sliding groove 12 in sequence. The rigid straight pipe 301 and the sampling port 11 are configured with an assembly structure that has a locked state and a released state.

[0037] Specifically, the rigid straight pipe 301 of the feed pipe 3 passes sequentially through the sampling port 11 of the mixing vessel 1 and the sliding groove 12 on the inner wall. The sliding groove 12 is located below the sampling port 11 and the axes of both are aligned, providing directional guidance for the vertical movement of the rigid straight pipe 301 and ensuring that the rigid straight pipe 301 can only be adjusted to the depth of insertion into the mixing vessel 1 in the set direction. The assembly structure at the sampling port 11 of the rigid straight pipe 301 has a locked state and a loose state. When it is necessary to adjust the sampling height, the assembly structure is switched to the loose state. At this time, the rigid straight pipe 301 can move freely up and down along the axis of the sliding groove 12 and the sampling port 11 until the sampling end 31 reaches the target height. After the adjustment is completed, the assembly structure is switched to the locked state to fix the position of the rigid straight pipe 301 and prevent it from shifting during the normal operation of the mixing vessel 1. The entire adjustment process does not require opening the closed structure of the mixing vessel 1 or stopping the mixing operation of the mixing vessel 1. The height adjustment can be completed simply by operating the state of the assembly structure.

[0038] This design allows for flexible adjustment of the sampling height. The rigid straight tube 301 can be adjusted to different depths according to changes in the liquid level of the material in the stirred tank 1 or the sampling requirements of different process stages, meeting the sampling needs of materials at different liquid levels in the stirred tank 1 and further improving the representativeness of the samples. Secondly, it achieves the goal of adjusting the sampling height without stopping the machine. During the adjustment process, the stirred tank 1 can maintain normal stirring without interrupting the production process, avoiding the disruption of the material reaction balance caused by machine stoppage for adjustment, and eliminating the need to wait for the material to be mixed evenly again, thus improving production continuity and efficiency. At the same time, the directional fit between the sliding groove 12 and the sampling port 11, as well as the fixing effect after the assembly structure is locked, ensure that the rigid straight tube 301 is stable in position after adjustment, and will not shake or shift due to the impact of material flow in the stirred tank 1. It can also maintain the sealing of the stirred tank 1, avoiding material leakage or external contamination, and ensuring production safety and sample purity.

[0039] In some embodiments, such as Figure 5 and Figure 6 As shown, the sampling port 11 may be provided with a through hole 111 for the rigid straight pipe 301 to pass through. The through hole 111 includes a tapered section 112 and a threaded section 113 located on the upper side of the tapered section 112. The larger diameter end of the tapered section 112 is on top, and the smaller diameter end is on the bottom. The diameter of the larger diameter end of the tapered section 112 is not greater than the diameter of the threaded section 113.

[0040] Furthermore, the sampling device for the stirred tank also includes a conical sealing ring 7 and a tightening ring 8. The shape of the conical sealing ring 7 is adapted to the shape of the conical bore section 112. The conical sealing ring 7 is fitted onto the rigid straight tube 301 and is located within the conical bore section 112. The tightening ring 8 is provided with external threads. The tightening ring 8 is fitted onto the rigid straight tube 301 and engages with the threaded bore section 113, pressing the conical sealing ring 7. After being compressed, the conical sealing ring 7 forms a tight fit with the rigid straight tube 301 and the conical bore section 112, achieving both a sealing effect and height locking of the rigid straight tube 301, i.e., a locked state. Reverse rotation of the tightening ring 8 releases the pressure on the conical sealing ring 7, entering a loosened state, allowing for free height adjustment of the rigid straight tube 301.

[0041] In some embodiments, such as Figure 5 As shown, the outer surface of the rigid straight tube 301 may be provided with a scale line 302 for marking the depth of insertion into the mixing vessel 1, so that the operator can judge the height adjustment amount.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sampling device for a stirred tank, comprising a stirred tank (1), characterized in that, Also includes: The diaphragm pump (2) includes an inlet (21) and an outlet (22); The feed pipeline (3) includes a sampling end (31), a suction end (32) and a sampling port (33) disposed between the sampling end (31) and the suction end (32). The sampling end (31) extends into the material in the mixing vessel (1), and the suction end (32) is connected to the feed port (21) of the diaphragm pump (2). The return pipeline (4) is connected at one end to the outlet (22) of the diaphragm pump (2) and at the other end to the mixing vessel (1); The sampling valve (5) is connected to the sampling port (33) of the feed pipeline (3).

2. The sampling device for a stirred tank according to claim 1, characterized in that, The feed pipe (3) is located inside the mixing vessel (1) and its section is closely attached to the inner wall of the mixing vessel (1).

3. The sampling device for a stirred tank according to claim 1, characterized in that, A transparent sight glass section (6) is provided at the front end of the sampling port (33) of the feed pipeline (3).

4. The sampling device for a stirred tank according to claim 1, characterized in that, The return pipeline (4) is provided with a first switch valve (41) at one end near the mixing vessel (1), and a discharge port (42) is provided between the first switch valve (41) and the discharge port (22), and a second switch valve (43) is provided at the discharge port (42).

5. The sampling device for a stirred tank according to claim 1, characterized in that, A main switch valve (34) is provided between the end of the feed pipeline (3) near the mixing vessel (1) and the sampling port (33).

6. The stirred tank sampling device according to any one of claims 1 to 5, characterized in that, The sampling end (31) of the feed line (3) is configured to be height-adjustable within the mixing vessel (1).

7. The sampling device for a stirred tank according to claim 6, characterized in that, The feed pipeline (3) includes a rigid straight pipe (301), the mixing vessel (1) is provided with a sampling port (11), the inner side wall of the mixing vessel (1) is provided with a sliding groove (12), the sliding groove (12) is located below the sampling port (11), and the sliding groove (12) is aligned with the axial direction of the sampling port (11). The rigid straight tube (301) passes through the sampling port (11) and the sliding groove (12) in sequence. The rigid straight tube (301) and the sampling port (11) are configured to have an assembly structure with a locked state and a released state.

8. The sampling device for a stirred tank according to claim 7, characterized in that, The sampling port (11) is provided with a through hole (111) for the rigid straight pipe (301) to pass through. The through hole (111) includes a tapered hole section (112) and a threaded hole section (113) located on the upper side of the tapered hole section (112). The tapered hole section (112) has its large diameter end on top and its small diameter end on the bottom, and the diameter of the large diameter end of the tapered hole section (112) is not greater than the diameter of the threaded hole section (113). The sampling device of the stirred tank also includes a conical sealing ring (7) and a tightening ring (8); the shape of the conical sealing ring (7) is adapted to the shape of the conical hole section (112), the conical sealing ring (7) is sleeved on the rigid straight pipe (301) and is located in the conical hole section (112); the tightening ring (8) is provided with external threads, the tightening ring (8) is sleeved on the rigid straight pipe (301) and threadedly engaged with the threaded hole section (113) to press the conical sealing ring (7).

9. The sampling device for a stirred tank according to claim 7, characterized in that, The outer surface of the rigid straight tube (301) is provided with scale lines (302) for marking the depth of insertion into the stirring vessel (1).

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