Full-automatic sampling device for liquid storage tank

Abstract

This utility model relates to the field of liquid storage tank sampling technology, and more particularly to a fully automatic liquid storage tank sampling device, including a fixed shell; it also includes a connecting block installed inside the fixed shell. The fixed shell is connected to a blind plate via a flange. Five sampling tubes are installed in the groove of the blind plate. One end of each of the five sampling tubes extends to the outside of the blind plate and is used to connect to the liquid storage tank for sampling. The end of each of the five sampling tubes away from the blind plate is connected to a fixed tube. A needle valve is installed on the outer side of each of the five sampling tubes. A ferrule three-way pneumatic diaphragm valve and a discharge pump are installed at the front end of the connecting block. The fixed tube is connected to the first interface of the ferrule three-way pneumatic diaphragm valve, and the second interface of the ferrule three-way pneumatic diaphragm valve is connected to a discharge pipe, which is installed at the output end of the discharge pump. This utility model uses multi-point combined sampling and can individually close a sampling channel to avoid cross-contamination or abnormal data interference, ensuring the representativeness and accuracy of the samples.

Description

Technical Field

[0001] This utility model relates to the field of liquid storage tank sampling technology, and in particular to a fully automatic liquid storage tank sampling device. Background Technology

[0002] Liquid tank sampling devices are mainly used to collect liquid samples from large storage tanks for quality testing, composition analysis or other laboratory tests. The sampling device is usually installed on the top of the tank and uses the pressure difference between the inside and outside of the tank to make the liquid flow through the sampling pipeline into the collection container.

[0003] Common liquid storage tank sampling devices are installed on the top of the tank, making it difficult to obtain representative liquid samples from each layer. Fixed-depth sampling cannot meet the requirements for stratified sampling, and the sampling process is prone to causing medium volatilization or contamination.

[0004] Therefore, the above-mentioned liquid storage tank sampling devices are difficult to obtain representative samples from each layer, fixed-depth sampling cannot meet the stratification requirements, and the sampling process is prone to problems such as medium volatilization and pollution. There is an urgent need to design a new type of fully automatic liquid storage tank sampling device. Utility Model Content

[0005] To overcome the difficulties of obtaining representative samples from each layer in common liquid storage tank sampling devices, fixed-depth sampling cannot meet the requirements of stratification, and the sampling process is prone to problems such as media volatilization and contamination.

[0006] The technical solution of this utility model is as follows: a fully automatic sampling device for liquid storage tanks, including a fixed shell; and a connecting block installed inside the fixed shell. The fixed shell is connected to a blind plate via a flange. Five sampling tubes are installed in the groove of the blind plate. One end of each of the five sampling tubes extends to the outside of the blind plate. The outer ends of the five sampling tubes are used to connect to the liquid storage tank for sampling. The ends of the five sampling tubes away from the blind plate are connected to a fixed tube. A needle valve is installed on the outer side of each of the five sampling tubes. A ferrule three-way pneumatic diaphragm valve and a discharge pump are installed at the front end of the connecting block. The fixed tube is connected to the first interface of the ferrule three-way pneumatic diaphragm valve. The second port of the three-way pneumatic diaphragm valve is connected to a discharge pipe, which is installed at the output end of the discharge pump. Each of the five sampling tubes has a ferrule pneumatic diaphragm valve installed on its outer side. The sampling assembly includes a transport module, a diversion module, a sampling module, and a conveying module installed at the ferrule three-way pneumatic diaphragm valve port. The transport module provides driving force for the transport module. The diversion module is used to introduce the material inside the transport module into the sampling module. The blind plate is used to fix multiple sampling tubes to ensure that they are arranged neatly and sealed well. Each ferrule pneumatic diaphragm valve is used to control the opening and closing of each sampling tube individually. The fixed pipe is the unified confluence path for the five sampling tubes.

[0007] Preferably, the device has five sampling tubes, which are inserted into different liquid levels in the storage tank, corresponding to different depths, to independently collect samples from multiple layers inside the liquid storage tank. Each sampling tube is equipped with a ferrule-operated pneumatic diaphragm valve to control whether the sampling point is opened, enabling selective sampling. The samples collected by all sampling tubes eventually flow into a fixed tube as a unified output path. The fixed tube is connected to the first port of the ferrule-operated three-way pneumatic diaphragm valve, serving as a switching node for subsequent material flow. If the second port of the ferrule-operated three-way pneumatic diaphragm valve is selected, the material flows into discharge pipe one and is discharged to a designated container by a discharge pump. If the third port of the ferrule-operated three-way pneumatic diaphragm valve is selected, the material enters discharge pipe two through a three-way valve, realizing classified discharge for different purposes, such as experimental samples, retained samples, or waste liquid discharge. Each sampling tube is equipped with a needle valve, which can be used for fine adjustment of the flow rate or to cut off a sampling path during maintenance. The entire device is encapsulated in a fixed shell, and the blind plate is connected by a flange for easy disassembly and maintenance.

[0008] Preferably, the conveying module includes an electric gear pump mounted on the upper end face of the connecting block. The output end of the electric gear pump is connected to a return pipe. A one-way valve is installed on the surface of the return pipe to prevent the material inside the return pipe from flowing back. The electric gear pump is used to drive the material flow inside the return pipe.

[0009] Preferably, the transport module includes a connecting pipe installed at the third port of the ferrule three-way pneumatic diaphragm valve. The connecting pipe is used to transport the material in the sampling tube. The end of the connecting pipe away from the ferrule three-way pneumatic diaphragm valve is installed at the input end of the electric gear pump. The ferrule three-way pneumatic diaphragm valve can open and close the port to control whether the material flows into the connecting pipe.

[0010] Preferably, the diversion module includes a three-way valve installed on the outer side of the connecting pipe, which can change the flow direction of the material in the connecting pipe.

[0011] Preferably, the sampling module includes a discharge pipe two installed at the third port of a three-head valve. The three-head valve is used to control the direction of the fluid to achieve the flow of liquid to the discharge pipe two.

[0012] Preferably, a power distribution box is installed on the left end face of the fixed shell, and a control module is installed on the power distribution box. The power distribution box and the control module are used to control the opening and closing of the valves at the corresponding sampling points. A touch screen is installed on the front side of the repair door, and the touch screen displays the current operating status of the sampling operation of the device.

[0013] Preferably, a repair door is movably connected to the front side of the fixed shell, which is used for maintenance and repair of the internal sampling structure.

[0014] The beneficial effects of this utility model are:

[0015] 1. Multiple sampling tubes are arranged at different depths to cover the liquid distribution at various levels of the storage tank. Each sampling tube is equipped with an independent ferrule pneumatic diaphragm valve, which supports flexible selection of sampling positions and enables multi-point combined sampling. When necessary, a single sampling channel can be closed to effectively prevent cross-contamination or abnormal data from affecting the overall sampling results, thereby ensuring that the obtained samples have higher representativeness and accuracy.

[0016] 2. The entire pipeline system adopts a fully enclosed structure, working in conjunction with a compression fitting pneumatic diaphragm valve, a compression fitting three-way pneumatic diaphragm valve, and a discharge pump. This effectively isolates external contamination, reduces the loss of volatile media, improves operational safety, and protects the working environment and personnel health. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the fully automatic sampling device for liquid storage tanks according to this utility model.

[0018] Figure 2 The diagram shown is a three-dimensional perspective view of the connection block of the fully automatic sampling device for liquid storage tanks of this utility model.

[0019] Figure 3 The diagram shown is a top view of the fully automatic sampling device for liquid storage tanks according to this utility model.

[0020] Figure 4 The diagram shown is a frontal perspective three-dimensional structural schematic of the fully automatic sampling device for liquid storage tanks according to this utility model.

[0021] Figure 5 The diagram shown is a right-side view of the fully automatic sampling device for liquid storage tanks according to this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Fixed housing; 2. Repair door; 3. Touch screen; 4. Distribution box; 5. Control module; 6. Blind plate; 7. Connecting block; 8. Sampling tube; 9. Compression fitting pneumatic diaphragm valve; 10. Fixed tube; 11. Electric gear pump; 12. Compression fitting three-way pneumatic diaphragm valve; 13. Needle valve; 14. Return pipe; 15. Check valve; 16. Connecting pipe; 18. Discharge pump; 19. Discharge pipe one; 20. Discharge pipe two; 21. Three-way valve. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figures 1-5This utility model provides an embodiment of a fully automatic sampling device for liquid storage tanks, including a fixed shell 1; and a connecting block 7 disposed inside the fixed shell 1. The fixed shell 1 is connected to a blind plate 6 via a flange. Five sampling tubes 8 are installed in the groove of the blind plate 6. One end of each sampling tube 8 extends to the outside of the blind plate 6 and is used to connect to the liquid storage tank for sampling. The end of each sampling tube 8 away from the blind plate 6 is connected to a fixed tube 10. A needle valve 13 is installed on the outer surface of each of the five sampling tubes 8. A compression fitting three-way pneumatic diaphragm valve 12 and a drain valve are installed at the front end of the connecting block 7. The material pump 18 and the fixed pipe 10 are connected to the first interface of the ferrule three-way pneumatic diaphragm valve 12. The second interface of the ferrule three-way pneumatic diaphragm valve 12 is connected to the discharge pipe 19, which is installed at the output end of the discharge pump 18. A ferrule pneumatic diaphragm valve 9 is installed on the outer side of each of the five sampling tubes 8. The sampling assembly includes a transport module, a diversion module, a sampling module, and a conveying module installed at the interface of the ferrule three-way pneumatic diaphragm valve 12. The conveying module provides driving force for the transport module. The diversion module is used to introduce the material inside the transport module into the sampling module. The blind plate 6 is used to fix the multiple sampling tubes 8 to ensure their arrangement. Neatly arranged and well-sealed, each ferrule-operated pneumatic diaphragm valve 9 is used to individually control the opening and closing of each sampling tube 8. The fixed tube 10 serves as a unified confluence path for the five sampling tubes 8. The device contains five sampling tubes 8, which are inserted into different liquid levels in the storage tank, corresponding to different depths, enabling independent sampling of multiple layers of samples inside the liquid storage tank. Each sampling tube 8 is equipped with a ferrule-operated pneumatic diaphragm valve 9 on its outer side to control whether the sampling point is opened, achieving selective sampling. The samples collected by all sampling tubes 8 ultimately flow into the fixed tube 10, serving as a unified output path. The fixed tube 10 is connected to the ferrule-operated three-way pneumatic diaphragm valve 1. The first interface of 2 serves as a switching node for subsequent material flow. If the second interface of the ferrule three-way pneumatic diaphragm valve 12 is selected, the material flows into the discharge pipe 19 and is discharged to the designated container via the discharge pump 18. If the third interface of the ferrule three-way pneumatic diaphragm valve 12 is selected, the material enters the discharge pipe 20 through the three-head valve 21, realizing classified discharge for different purposes, such as experimental samples, retained samples, or waste liquid discharge. Each sampling pipe 8 is equipped with a needle valve 13, which can be used to finely adjust the flow rate or cut off a certain sampling path during maintenance. The entire device is encapsulated in the fixed shell 1, and the blind plate 6 is connected by a flange for easy disassembly and maintenance.

[0025] Please see Figures 2-5In this embodiment, the conveying module includes an electric gear pump 11 mounted on the upper surface of the connecting block 7. The output end of the electric gear pump 11 is connected to a return pipe 14. A one-way valve 15 is mounted on the surface of the return pipe 14 to prevent material backflow inside the return pipe 14. The electric gear pump 11 is used to drive the material flow inside the return pipe 14. The electric gear pump 11 is a power source that provides driving force for the material flow. The transport module includes a connecting pipe 16 installed at the third interface of the ferrule three-way pneumatic diaphragm valve 12. The connecting pipe 16 is used to transport the material in the sampling tube 8. The end of the connecting pipe 16 away from the ferrule three-way pneumatic diaphragm valve 12 is installed at the input end of the electric gear pump 11. The ferrule three-way pneumatic diaphragm valve 12 can open and close the interface to control the material flow. The material flows into the connecting pipe 16. The third port of the ferrule three-way pneumatic diaphragm valve 12 is connected to the connecting pipe 16, serving as the inlet of the transport module. The ferrule three-way pneumatic diaphragm valve 12 can be controlled to automatically open and close, determining whether the material enters the discharge pipe 19 for discharge or enters the transport module for further processing. The electric gear pump 11 has good self-priming capability and stable flow output, suitable for conveying high-viscosity or low-flow-rate liquids. The diversion module includes a three-head valve 21 installed on the outer side of the connecting pipe 16. The sampling module includes a discharge pipe 20 installed on the third port of the three-head valve 21. The three-head valve 21 is used to control the direction of the fluid to achieve the flow of liquid to the discharge pipe 20. The discharge pipe 20 works in conjunction with the three-head valve 21 to achieve multi-channel sorting function and improve the flexibility of the device.

[0026] Please see Figures 1-4 In this embodiment, a power distribution box 4 is installed on the left end face of the fixed shell 1, and a control module 5 is installed on the power distribution box 4. The power distribution box 4 and the control module 5 are used to control the opening and closing of the valves at the corresponding sampling points. (The power distribution box 4 and the control module 5 are responsible for executing the preset control logic and coordinating the operation of various pneumatic valves, pumps and other electric components.) A touch screen 3 is installed on the front side of the repair door 2. The touch screen 3 displays the current operating status of the sampling operation of the device. The repair door 2 allows users to set parameters, adjust the sampling plan, view historical records and receive alarm notifications. The repair door 2 is movably connected to the front side of the fixed shell 1. The repair door 2 is used for maintenance and repair of the internal sampling structure. The setting of the repair door 2 facilitates maintenance personnel to access the internal components for daily inspection, maintenance or replacement of parts, increases the maintainability of the equipment, reduces downtime and improves work efficiency.

[0027] Working principle: The user selects the sampling tube 8 to be opened via touchscreen 3. Each sampling tube 8 corresponds to a different depth within the storage tank. Touchscreen 3 displays the current operating status. The ferrule-operated pneumatic diaphragm valve 9 is opened according to the selected sampling point, allowing liquid to enter the corresponding sampling tube 8. Each sampling tube 8 is equipped with an independent valve for selective sampling. The sample flows into the fixed tube 10. All samples collected from the opened sampling tubes 8 ultimately flow into the fixed tube 10 as a unified output path. The electric gear pump 11 starts operating, providing driving force for material flow. The sample in the fixed tube 10 is transported to the pump inlet through the connecting pipe 16. A one-way valve 15 is installed on the return pipe 14 to prevent backflow and ensure the device's operation. With stable pressure, the ferrule three-way pneumatic diaphragm valve 12 switches the flow direction, determining whether the material is directly discharged or enters the transport module for further processing. If the second interface is selected, the material will flow into discharge pipe 19 and be discharged to the designated container via discharge pump 18. If the third interface is selected, the material will enter discharge pipe 20 through three-way valve 21, achieving classified discharge, such as experimental samples, retained samples, or waste liquid discharge. Three-way valve 21 controls the flow direction, guiding the material to different discharge pipes as needed. For example, discharge pipe 20 is used for sample collection for special purposes. Other interfaces can be connected to return pipelines or other processing facilities. After closing the valve, sampling is completed. After sampling is completed, all relevant valves are closed. If necessary, the remaining material can be sent back to the storage tank through return pipe 14.

[0028] Through the above steps, multiple sampling tubes 8 are arranged according to different liquid levels in the storage tank, which can accurately obtain liquid samples from each layer. Each sampling tube 8 is equipped with an independent ferrule-operated pneumatic diaphragm valve 9, which supports opening any sampling point as needed, realizing flexible combination of multi-point collection. When necessary, a certain sampling channel can also be closed individually to avoid cross-contamination or abnormal data interference, thereby improving the representativeness of the sample and the accuracy of the test results. This solves the problems of common liquid storage tank sampling devices, which are difficult to obtain representative samples from each layer, fixed depth sampling cannot meet the stratification requirements, and the easy occurrence of medium volatilization and contamination during the sampling process.

Claims

1. A fully automatic sampling device for liquid storage tanks, comprising a fixed shell (1); characterized in that: It also includes a connecting block (7) installed inside the fixed shell (1). The fixed shell (1) is connected to a blind plate (6) via a flange. Five sampling tubes (8) are installed in the groove of the blind plate (6). One end of the five sampling tubes (8) extends to the outside of the blind plate (6). The end of the five sampling tubes (8) extending to the outside is used to connect to the liquid storage tank for sampling. The end of the five sampling tubes (8) away from the blind plate (6) is connected to a fixed tube (10). The outer surfaces of the five sampling tubes (8) are all A needle valve (13) is installed. A ferrule three-way pneumatic diaphragm valve (12) and a discharge pump (18) are installed at the front end of the connecting block (7). The fixed pipe (10) is connected to the first interface of the ferrule three-way pneumatic diaphragm valve (12). The second interface of the ferrule three-way pneumatic diaphragm valve (12) is connected to the discharge pipe (19). The discharge pipe (19) is installed at the output end of the discharge pump (18). A ferrule pneumatic diaphragm valve (9) is installed on the outer side of each of the five sampling tubes (8). The sampling assembly includes a transport module, a diversion module, a sampling module, and a conveying module installed at the interface of the ferrule three-way pneumatic diaphragm valve (12). The transport module provides driving force for the transport module, and the diversion module is used to introduce the material inside the transport module into the sampling module. The blind flange (6) is used to fix multiple sampling tubes (8) to ensure that they are arranged neatly and sealed. Each ferrule pneumatic diaphragm valve (9) is used to control the opening and closing of each sampling tube (8) individually. The fixing tube (10) is the unified confluence path for the five sampling tubes (8).

2. The fully automatic sampling device for liquid storage tanks according to claim 1, characterized in that: The conveying module includes an electric gear pump (11) mounted on the upper surface of the connecting block (7). The output end of the electric gear pump (11) is connected to a return pipe (14). A one-way valve (15) is mounted on the surface of the return pipe (14). The one-way valve (15) prevents the material inside the return pipe (14) from flowing back. The electric gear pump (11) is used to drive the material flow inside the return pipe (14).

3. The fully automatic sampling device for liquid storage tanks according to claim 1, characterized in that: The transport module includes a connecting pipe (16) installed at the third port of the ferrule three-way pneumatic diaphragm valve (12). The connecting pipe (16) is used to transport the material in the sampling tube (8). The end of the connecting pipe (16) away from the ferrule three-way pneumatic diaphragm valve (12) is installed at the input end of the electric gear pump (11). The ferrule three-way pneumatic diaphragm valve (12) can open and close the port to control whether the material flows into the connecting pipe (16).

4. The fully automatic sampling device for liquid storage tanks according to claim 3, characterized in that: The diversion module includes a three-way valve (21) installed on the outer side of the connecting pipe (16), which can change the flow direction of the material in the connecting pipe (16).

5. The fully automatic sampling device for liquid storage tanks according to claim 4, characterized in that: The sampling module includes a discharge pipe two (20) installed at the third port of the three-head valve (21). The three-head valve (21) is used to control the direction of the fluid to achieve the flow of liquid to the discharge pipe two (20).

6. The fully automatic sampling device for liquid storage tanks according to claim 1, characterized in that: A distribution box (4) is installed on the left end face of the fixed shell (1). A control module (5) is installed on the distribution box (4). The control module (5) is used to control the opening and closing of the valves at the corresponding sampling points. A repair door (2) is movably connected to the front side of the fixed shell (1). The repair door (2) is used to maintain and repair the internal sampling structure.

7. The fully automatic sampling device for liquid storage tanks according to claim 6, characterized in that: A touch screen (3) is installed on the front side of the repair door (2), and the touch screen (3) displays the current operating status of the sampling operation of the device.

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