Sample pretreatment device

Abstract

The present application relates to a sample pretreatment device, which relates to the field of chemical reaction pretreatment, and comprises: a sampling unit for sucking a sample liquid; the proportional valve unit is connected with the sampling unit, and the proportional valve unit is connected with a diluent storage unit; the diluting and filtering unit is connected with the proportional valve unit and is used for mixing and filtering the sample liquid and the diluent; and the sample conveying unit is used for conveying and conveying the mixed and filtered sample liquid. Through the integrated design of the sampling unit, the proportional valve unit and the diluting and filtering unit, the whole treatment process can be completed in a relatively closed system, and the opportunity that a sample is exposed to an external environment is reduced, so that the air tightness is improved, and a sample solution and a diluent are prevented from being influenced by environmental factors in the treatment process; and the automatic sample treatment process can control the volume of the sample liquid and the addition of the diluent, so that the error of manual operation is reduced, and the sample treatment efficiency and accuracy are improved.

Description

Technical Field

[0001] This application relates to the field of chemical reaction pretreatment, and particularly to a sample pretreatment device. Background Art

[0002] During the process of sample submission for testing, especially in the chemical reaction detection stage, the sample pretreatment stage is crucial for ensuring the accuracy and reliability of the test results. Existing sample pretreatment systems usually rely on manual operation, and this traditional operation method has deficiencies in multiple aspects.

[0003] First of all, manual operation cannot effectively guarantee the airtightness during the processing. This is because during the operation, the sample and the solvent are often exposed to the external environment. Insufficient airtightness will cause the sample and the solvent to be affected by pollutants or moisture in the air during the processing, which may lead to sample degradation or solvent volatilization. This environmental instability not only affects the quality of the sample but also may introduce additional errors, thus reducing the accuracy of the test results.

[0004] Secondly, there is a high risk of misoperation during the manual operation process. The operator needs to manually select and adjust multiple parameters according to specific experimental requirements, such as solvent type, flow rate, and volume, etc. Due to the dependence on each step during the operation and the differences in the experience and skill levels of the operators, the probability of misoperation is relatively high. For example, improper selection of the solvent type, inaccurate control of the dilution rate, or even omission of some operation steps will have an adverse impact on the final result.

[0005] In summary, traditional manual operation has problems such as insufficient airtightness guarantee, high risk of misoperation, and excessive time consumption during the sample pretreatment process. These deficiencies limit the precision, reliability, and efficiency of sample processing. Therefore, there is an urgent need for an improved solution to overcome these problems and improve the overall performance of sample pretreatment. Summary of the Utility Model

[0006] In order to improve the problems of insufficient airtightness guarantee, high risk of misoperation, and excessive time consumption in sample pretreatment, this application provides a sample pretreatment device.

[0007] The sample pretreatment device provided by this application adopts the following technical solutions:

[0008] A sample pretreatment device includes:

[0009] A sampling unit for sucking the sample liquid;

[0010] A metering valve unit connected to the sampling unit, and the metering valve unit is connected to a diluent storage unit;

[0011] A dilution and filtration unit, connected to the metering valve unit, for mixing and filtering the sample liquid with the diluent;

[0012] A sample feeding unit for transporting the mixed and filtered sample liquid.

[0013] By adopting the above technical solution, through the integrated design of the sampling unit, metering valve unit and dilution and filtration unit, the whole processing process can be completed in a relatively closed system, reducing the chance of the sample being exposed to the external environment, thus improving the airtightness and avoiding the influence of environmental factors on the sample liquid and diluent during the processing; the automated sample processing flow can control the volume of the sample liquid and the addition of the diluent, reducing the error of manual operation and improving the efficiency and accuracy of sample processing; and through accurate quantification, uniform mixing and efficient filtration processes, the accuracy and purity of the sample are ensured, the stability and reliability of the sample during the processing are ensured, thereby optimizing the overall performance of sample pretreatment and making the experimental results more accurate.

[0014] In a specific feasible embodiment, the sampling unit includes a sampling needle and a first driving member, the first driving member is connected to the sampling needle and drives the sampling needle to move, and the sampling needle is connected to the metering valve unit.

[0015] By adopting the above technical solution, by integrating the sampling needle and the first driving member, an automated and accurate sample sampling process can be realized, making the sample acquisition speed faster, improving the overall working efficiency, and enhancing the stability of the sampling process, reducing the unstable factors caused by manual operation, making the sample sampling process more reliable, thereby improving the working stability and processing efficiency of the system; and the connection design between the sampling needle and the metering valve unit can ensure the seamless transfer of the sample liquid and reduce the risk of sample contamination.

[0016] In a specific feasible embodiment, the metering valve unit includes a multi-channel fluid valve and a screw assembly, the multi-channel fluid valve is respectively connected to the sampling needle, the diluent storage unit and the dilution and filtration unit, and the opening and closing of each valve of the multi-channel fluid valve are adjusted by the forward or backward movement of the screw assembly.

[0017] By adopting the above technical solution, the cooperation of the multi-channel fluid valve and the screw assembly provides control over the fluid channels. By adjusting the opening and closing states of the valves, the flow rate and flow direction of the liquid can be accurately controlled, ensuring that the sample processing process can proceed according to the preset requirements, thereby improving the accuracy and reliability of sample processing.

[0018] In a specific feasible implementation, the dilution and filtration unit includes a sampling and dispensing needle and a dilution and filtration assembly. The sampling and dispensing needle is connected to the multi-channel fluid valve, and the sampling and dispensing needle sends the sample liquid and the dilution liquid to the dilution and filtration assembly for mixing and filtration.

[0019] By adopting the above technical solution, integrating the functions of the sampling and dispensing needle and the dilution and filtration assembly in one system can reduce the complexity of operation. The mixing and filtration processes of the sample liquid and the dilution liquid are completed within one assembly, making the operation more simple and efficient.

[0020] In a specific feasible implementation, the dilution and filtration assembly includes a syringe. A filter head is provided inside the syringe, and the sampling and dispensing needle is inserted into the syringe. A sample bottle is provided at the bottom of the syringe to store the sample liquid after mixing and filtration.

[0021] By adopting the above technical solution, the design of the sampling and dispensing needle, the syringe and its filter head provides an efficient mixing and filtration of the sample liquid. The sampling and dispensing needle is responsible for sending the sample liquid into the syringe for mixing with the dilution liquid, and the filter head inside the syringe effectively removes impurities to ensure the purity of the sample. Finally, the processed sample is stored in the sample bottle. This design can simplify the operation steps, improve the processing efficiency and the accuracy of the results, and at the same time ensure the quality of the sample.

[0022] In a specific feasible implementation, it further includes a second driving member, which is used to drive the dilution and filtration unit to move to a position corresponding to the sampling and dispensing needle, so that the sampling and dispensing needle enters the syringe.

[0023] By adopting the above technical solution, the second driving member is responsible for driving the movement of the dilution and filtration unit, ensuring that the sampling and dispensing needle accurately enters a predetermined position inside the syringe, controlling the depth and position of the sampling and dispensing needle inserted into the syringe, thereby improving the automation level of the whole system, enhancing the accuracy and efficiency of the sample processing process; and the automatically driven sampling and dispensing needle reduces the risk of manual operation and reduces the safety problems caused by improper operation.

[0024] In a specific feasible implementation, it further includes a spring structure, which is arranged inside the syringe and abuts against the sampling and dispensing needle, and is used to drive the sampling and dispensing needle to rebound.

[0025] By adopting the above technical solution, the spring structure is responsible for automatically pushing the sampling needle back to its original position after the sampling needle completes the injection operation. The design of this rebound mechanism simplifies the operation process, prepares for the next sample injection, optimizes the operation process, reduces the need for manual operation, and improves the automation level of the system. Moreover, the spring structure can buffer the movement of the sampling needle, avoiding excessive impact or friction on the sampling needle during operation, which helps to protect the lifespan and performance of the sampling needle and related components.

[0026] In a specific feasible implementation, the sample delivery unit includes a third driving member and a slider seat connected to the third driving member. The sample vial is disposed on the slider seat, and the third driving member is used to drive the slider seat to move.

[0027] By adopting the above technical solution, through the driving control of the third driving member and the design of the slider seat movement, the automation level and operation efficiency of sample processing can be improved. At the same time, the stability and accuracy of the sample vial position can be ensured, and the need for manual intervention can be reduced, improving the operation efficiency.

[0028] In a specific feasible implementation, the multi-channel fluid valve is also connected to a pump source.

[0029] By adopting the above technical solution, using the stable fluid power provided by the pump source and combining with the adjustment function of the multi-channel fluid valve, efficient fluid transportation and distribution can be achieved, shortening the operation time, improving the production efficiency, being able to control the flow rate and pressure of the fluid, and being able to adapt to various application scenarios.

[0030] In a specific feasible implementation, the multi-channel fluid valve is also connected to a cleaning liquid storage unit.

[0031] By adopting the above technical solution, by controlling the opening of the valve of the multi-channel fluid valve, the cleaning liquid is introduced from the cleaning liquid storage unit, and the cleaning liquid flows through each channel of the multi-channel fluid valve to clean the internal residues. The multi-channel fluid valve introduced with the cleaning liquid storage unit can not only enhance the cleaning and maintenance functions of the overall device, but also improve the operation efficiency and reliability of the system.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] Through the integrated design of the sampling unit, metering valve unit, and dilution and filtration unit, the entire processing process can be completed in a closed system, reducing the chance of the sample being exposed to the external environment, thereby enhancing the airtightness and preventing the sample liquid and dilution liquid from being affected by environmental factors during the processing; the automated sample processing flow can control the volume of the sample liquid and the addition of the dilution liquid, reducing the error of manual operation and improving the efficiency and accuracy of sample processing; and through precise metering, uniform mixing, and efficient filtration processes, the accuracy and purity of the sample can be ensured, ensuring the stability and reliability of the sample during the processing, thereby optimizing the overall performance of sample pretreatment and making the experimental results more accurate. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of a sample pretreatment device according to an embodiment of the present application.

[0035] Figure 2 is a schematic structural diagram for showing the multi-channel fluid valve and the screw assembly.

[0036] Figure 3 is a schematic structural diagram for showing the dilution and filtration unit and the sample delivery unit.

[0037] Figure 4 is a schematic structural diagram for showing the sampling unit, metering valve unit, dilution and filtration unit, and sample delivery unit.

[0038] Description of the reference numerals: 1. Sampling unit; 11. Sampling needle; 12. First driving member; 13. First motor; 14. First lead screw; 15. First slider; 2. Metering valve unit; 21. Multi-channel fluid valve; 22. Screw assembly; 23. Second motor; 24. Screw; 3. Dilution and filtration unit; 31. Sample pick-up and delivery needle; 32. Dilution and filtration assembly; 33. Syringe; 34. Sample bottle; 4. Sample delivery unit; 41. Third driving member; 42. Slide block seat; 43. Third motor; 44. Third lead screw. Detailed Description of the Embodiment

[0039] The following will further describe the present application in detail Figures 1-4 with reference to the accompanying drawings.

[0040] Referring to Figure 1 , an embodiment of the present application discloses a sample pretreatment device. In this embodiment, the sample pretreatment device includes but is not limited to being used for industrial automation sampling, dilution, filtration, sample injection, transmission and other technological processes, or for the transfer and simple dilution, quenching treatment and other experimental processes of reaction liquids in the laboratory;

[0041] The sample pretreatment device includes:

[0042] Sampling unit 1 is used to aspirate the sample liquid. In this embodiment, the sample liquid for the chemical reaction includes but is not limited to being stored in the reaction kettle;

[0043] Quantitative valve unit 2 is connected to sampling unit 1, and a diluent storage unit is connected to quantitative valve unit 2. In this embodiment, the diluent storage unit stores various diluents. During actual use, the corresponding diluent is transported to quantitative valve unit 2 according to requirements;

[0044] Dilution and filtration unit 3 is connected to quantitative valve unit 2 and is used to mix and filter the sample liquid and the diluent;

[0045] Sample delivery unit 4 is used to transport the mixed and filtered sample liquid;

[0046] During operation, sampling unit 1 aspirates the sample liquid to be processed from the sample container, starts quantitative valve unit 2, and sampling unit 1 transports the obtained sample liquid to quantitative valve unit 2. Quantitative valve unit 2 controls the volume of the sample liquid, connects the diluent storage unit according to requirements, and transports the sample liquid and the diluent to dilution and filtration unit 3 according to a preset ratio. Dilution and filtration unit 3 mixes the diluent and the sample liquid and filters the mixed liquid. Finally, the processed sample liquid is transported to the subsequent detection or analysis equipment through sample delivery unit 4 to complete the sample pretreatment work.

[0047] Sampling unit 1 includes a sampling needle 11 and a first driving member 12. The first driving member 12 is connected to the sampling needle 11 and drives the sampling needle 11 to move. In this embodiment, the sampling needle 11 and quantitative valve unit 2 include but are not limited to being connected and communicated through a pipeline. In this embodiment, the first driving member 12 includes but is not limited to a first motor 13, a first lead screw 14, and a first slider 15. The motor shaft of the first motor 13 is connected to the first lead screw 14. The first slider 15 is rotatably connected to the first lead screw 14 and slides along the first lead screw 14. The first slider 15 is connected to the sampling needle 11, and the first lead screw 14 drives the first slider 15 and the sampling needle 11 connected thereto to move along the vertical direction z;

[0048] By integrating the sampling needle 11 and the first driving member 12, an automated and precise sample sampling process is realized, enabling a faster sample acquisition speed, improving the overall work efficiency, enhancing the stability of the sampling process, reducing the unstable factors caused by manual operation, making the sample sampling process more reliable, thereby improving the working stability and processing efficiency of the system; and the connection design between the sampling needle 11 and the quantitative valve unit 2 can ensure seamless transfer of the sample liquid and reduce the risk of sample contamination;

[0049] The quantitative valve unit 2 includes a multi-channel fluid valve 21 and a screw assembly 22. In this embodiment, the multi-channel fluid valve 21 includes but is not limited to a six-way valve. The multi-channel fluid valve 21 is respectively connected to the sampling needle 11, the diluent storage unit, and the dilution and filtration unit 3. In this embodiment, the screw assembly 22 is provided with six groups corresponding to the valves of each fluid channel of the six-way valve. The screw assembly 22 includes but is not limited to a second motor 23 and a screw 24. The motor shaft of the second motor 23 is connected to the screw 24. By driving the forward or backward movement of the screw 24, the opening and closing of each valve in the six-way valve are adjusted; through the cooperation of the multi-channel fluid valve 21 and the screw assembly 22, control of the fluid channel is provided. By adjusting the opening and closing state of the valve, the flow rate and flow direction of the liquid can be accurately controlled, ensuring that the sample processing process can proceed according to the preset requirements, thereby improving the accuracy and reliability of sample processing;

[0050] The dilution and filtration unit 3 includes a sample pick-up and delivery needle 31 and a dilution and filtration assembly 32. In this embodiment, the sample pick-up and delivery needle 31 and the multi-channel fluid valve 21 include but are not limited to being connected and communicated through a pipeline; the dilution and filtration assembly 32 includes a syringe 33. A filter head is provided inside the syringe 33. The sample pick-up and delivery needle 31 is inserted into the syringe 33 to send the sample liquid and the diluent into the syringe 33 for mixing and filtration. In this embodiment, the sample pick-up and delivery needle 31 is used to deliver the sample liquid and the diluent to the syringe 33, and can also be used to suck the sample liquid from the reaction kettle;

[0051] Through the design of the sample pick-up and delivery needle 31, the syringe 33 and its filter head, an efficient mixing and filtration of the sample liquid are provided. The sample pick-up and delivery needle 31 is responsible for sending the sample liquid into the syringe 33 for mixing with the diluent. The filter head inside the syringe 33 effectively removes impurities, ensuring the purity of the sample. This design is integrated in a system, which can simplify the operation steps. The mixing and filtration process of the sample liquid and the diluent are completed within one component, making the operation more convenient and efficient, improving the processing efficiency and the accuracy of the result, and at the same time ensuring the quality of the sample;

[0052] The sample pretreatment device further includes a second driving member. The second driving member is used to drive the dilution and filtration unit 3 to move to a position corresponding to the sample pick-up and delivery needle 31, so that the sample pick-up and delivery needle 31 can be inserted into the syringe 33. In this embodiment, the second driving member is multiple groups of driving members with three directions of x, y, and z. The second driving member is responsible for driving the dilution and filtration unit 3 to move in the three directions of x, y, and z, controlling the insertion depth and position of the sample pick-up and delivery needle 31, ensuring that the sample pick-up and delivery needle 31 enters a predetermined position inside the syringe 33, thereby improving the automation level of the entire system and enhancing the precision and efficiency of the sample processing process;

[0053] And in this embodiment, the second driving member can drive the dilution and filtration unit 3 and the sample feeding unit 4 to move in three directions of x, y, and z together, so that after the sample pretreatment is completed, the second driving member can also drive the sample feeding unit 4 to move in three directions of x, y, and z;

[0054] The dilution and filtration assembly 32 further includes a spring structure. The spring structure is disposed in the syringe 33 and abuts against the sampling and dispensing needle 31 for driving the sampling and dispensing needle 31 to rebound. The spring structure is responsible for automatically pushing the sampling and dispensing needle 31 back to the original position after the sampling and dispensing needle 31 completes the injection operation. The design of this rebound mechanism simplifies the operation process, prepares for the next sample injection, optimizes the operation process, reduces the need for manual operation, and improves the automation level of the system;

[0055] A sample bottle 34 is provided at the bottom of the syringe 33. The mixed and filtered sample liquid flows out through the needle of the syringe 33 into the sample bottle 34;

[0056] The sample feeding unit 4 includes a third driving member 41 and a slider seat 42 connected to the third driving member 41. In this embodiment, the third driving member 41 includes but is not limited to a third motor 43 and a third lead screw 44. The motor shaft of the third motor 43 is connected to the third lead screw 44. The slider seat 42 is rotationally connected to the third lead screw 44 and slides along the third lead screw 44. The sample bottle 34 is disposed on the slider seat 42. Through the driving control and the design of the movement of the slider seat 42, the effect of moving out the sample bottle 34 can be achieved. Then, the second driving member drives the sample feeding unit 4 to move in three directions of x, y, and z to transport the sample bottle 34 to the next process, thereby improving the automation level and operation efficiency of sample processing, ensuring the stability and accuracy of the position of the sample bottle 34, and reducing the need for manual intervention and improving the operation efficiency;

[0057] During operation, the sampling needle 11 rotates the first lead screw 14 under the drive of the first motor 13, and the first lead screw 14 drives the first slider 15 to move into the reaction kettle filled with the sample liquid to aspirate the sample liquid. The sample liquid aspirated from the sampling needle 11 is transported to the multi-channel fluid valve 21 through a pipeline to complete the sampling work;

[0058] When it is necessary to mix the sample liquid and the diluent, start the corresponding screw assembly 22, drive the screw 24 to move forward or backward through the second motor 23, and adjust the opening and closing states of the relevant valves of the multi-channel fluid valve 21, so that the diluent and the sample liquid are transported to the dilution and filtration unit 3 according to the set ratio; during this process, drive the dilution and filtration unit 3 to move in the x, y, and z directions through the second driving member to control the sampling and dispensing needle 31 to accurately enter the syringe 33. At this time, the sample liquid and the diluent can be transported into the syringe 33 through the sampling and dispensing needle 31. The sample liquid and the diluent are mixed in the syringe 33 and filtered through the filter head. The mixed and filtered sample liquid is transported into the sample bottle 34 through the needle of the syringe 33 for storage. During this process, the spring structure in the syringe 33 will push the sampling and dispensing needle 31 back to the original position to prepare for the next sample injection;

[0059] After the dilution and filtration work is completed, start the third motor 43 to drive the third lead screw 44 to rotate. The third lead screw 44 drives the slider seat 42 to move, and the sample bottle 34 also adjusts its position accordingly, and transports the sample bottle 34 to the subsequent detection or analysis equipment to complete the entire sample pretreatment work.

[0060] The multi-channel fluid valve 21 is also connected to a pump source. In this embodiment, the pump source includes but is not limited to a gas source; during the working process, by using the pump source to provide stable fluid power and combining the adjustment function of the multi-channel fluid valve 21, efficient fluid transportation and distribution can be achieved, the operation time can be shortened, the production efficiency can be improved, the flow rate and pressure of the fluid can be controlled, and various application scenarios can be adapted.

[0061] The multi-channel fluid valve 21 is also connected to a cleaning liquid storage unit; when it is necessary to clean the fluid valve or pipeline, by controlling the opening of the valve of the multi-channel fluid valve 21, the cleaning liquid is introduced from the cleaning liquid storage unit, and the cleaning liquid flows through each channel of the multi-channel fluid valve 21 to clean the internal residues; the multi-channel fluid valve 21 introduced with the cleaning liquid storage unit can not only enhance the cleaning and maintenance functions of the overall device, but also improve the operation efficiency and reliability of the system.

[0062] The implementation principle of the embodiment of the present application is as follows: The present application realizes the independent and precise control of multiple modules, realizes the complete sample submission and pretreatment process, and overcomes the limitations and disadvantages of traditional manual sample submission;

[0063] Through the integrated design of the sampling unit 1, the metering valve unit 2, and the dilution and filtration unit 3, the entire processing process can be completed in a closed system, which can reduce the chance of the sample being exposed to the external environment, thereby improving the airtightness and avoiding the influence of environmental factors on the sample liquid and the diluent during the processing process; the automated sample processing flow can control the volume of the sample liquid and the addition of the diluent, reduce the error of manual operation, and improve the efficiency and accuracy of sample processing;

[0064] Moreover, through precise quantification, uniform mixing, and efficient filtration processes, it is possible to ensure the accuracy and purity of the sample, guarantee the stability and reliability of the sample during the processing, thereby optimizing the overall performance of sample pretreatment and making the experimental results more accurate.

[0065] The above are all preferred embodiments of this application. Without restricting the protection scope of this application based on this, therefore: All equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A sample pretreatment device, characterized in that: Comprising: A sampling unit (1) for sucking a sample liquid; A metering valve unit (2) connected to the sampling unit (1), and a diluent storage unit is connected to the metering valve unit (2); A dilution and filtration unit (3) connected to the metering valve unit (2) for mixing and filtering the sample liquid and the diluent; A sample delivery unit (4) for transporting the mixed and filtered sample liquid.

2. The sample pretreatment device according to claim 1, wherein: The sampling unit (1) includes a sampling needle (11) and a first driving member (12), the first driving member (12) is connected to the sampling needle (11) and drives the sampling needle (11) to move, and the sampling needle (11) is connected to the metering valve unit (2).

3. The sample pretreatment device according to claim 2, characterized in that: The metering valve unit (2) includes a multi-channel fluid valve (21) and a screw assembly (22), the multi-channel fluid valve (21) is respectively connected to the sampling needle (11), the diluent storage unit and the dilution and filtration unit (3), and the opening and closing of each valve of the multi-channel fluid valve (21) are adjusted by the advancement or retraction of the screw assembly (22).

4. The sample pretreatment device according to claim 3, wherein: The dilution and filtration unit (3) includes a sample pick-up and delivery needle (31) and a dilution and filtration assembly (32), the sample pick-up and delivery needle (31) is connected to the multi-channel fluid valve (21), and the sample pick-up and delivery needle (31) sends the sample liquid and the diluent to the dilution and filtration assembly (32) for mixing and filtering.

5. The sample pretreatment device according to claim 4, characterized in that: The dilution and filtration assembly (32) includes a syringe (33), a filter head is provided in the syringe (33), and the sample pick-up and delivery needle (31) is inserted into the syringe (33); a sample bottle (34) is provided at the bottom of the syringe (33) to store the mixed and filtered sample liquid.

6. The sample pretreatment device according to claim 5, characterized in that: It further includes a second driving member for driving the dilution and filtration unit (3) to move to a position corresponding to the sample pick-up and delivery needle (31) so that the sample pick-up and delivery needle (31) enters the syringe (33).

7. The sample pretreatment device according to claim 5, wherein: It further includes a spring structure provided in the syringe (33) and abutted against the sample pick-up and delivery needle (31) for driving the sample pick-up and delivery needle (31) to rebound.

8. The sample pretreatment device according to claim 5, characterized in that: The sample delivery unit (4) includes a third driving member (41) and a slider seat (42) connected to the third driving member (41), the sample bottle (34) is provided on the slider seat (42), and the third driving member (41) is used to drive the slider seat (42) to move.

9. The sample pretreatment device according to claim 3, wherein: The multi-channel fluid valve (21) is further connected to a pump source.

10. The sample pretreatment device according to claim 3, wherein: The multi-channel fluid valve (21) is further connected to a cleaning liquid storage unit.

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