A tool and container for measuring and taking liquid

Abstract

The present invention provides a tool and container for measuring and taking liquid, comprising a pressure-changing device, a metering pipeline, an outflow channel, a liquid collection channel, and a reflux channel; wherein the pressure-changing device comprises a cylinder and a piston located therein, the two together forming a pressure-changing chamber; the pressure-changing chamber is provided with an opening connected to the zero-scale end of the metering pipeline; the pressure-changing chamber is provided with a space for temporarily accommodating liquid that has passed the zero-scale end of the metering pipeline; the liquid collection channel is connected to the metering pipeline via a one-way flow device leading to the metering pipeline; the end of the metering pipeline can be connected to the outflow channel or the reflux channel; the outflow channel is provided with a shutoff valve and a one-way flow device leading to the outflow outlet of the outflow channel; the reflux channel is provided with a shutoff valve. This tool and container has a simple structure, is easy to use, and provides accurate measurement.

Description

Technical Field

[0001] The present invention relates to a tool and a container for metering and taking liquid, in particular to a tool and a container for metering and taking liquid with a reflux channel. Background Art

[0002] People often need to measure the volume of liquids in their daily lives and work, such as measuring and removing various liquid reagents, liquid pesticides, liquid chemical raw materials, detergents, sterilizing solutions, liquid food ingredients, and liquid medicines from containers. Traditional liquid volume measurement tools such as graduated cylinders, measuring cups, and pipettes have numerous drawbacks, including inconvenience, waste and contamination caused by contact between the liquid and the measuring tool, volatilization of toxic liquids, oxidation of the liquid by air, and loss during transfer that affects measurement accuracy. To address these issues, new technologies such as self-metering tools and containers have been used in recent years to address these issues.

[0003] However, after repeated use, existing self-metering tools and containers may lose their ability to return to the zero mark, or even exceed it, due to factors such as airtightness, operating force, and speed. This not only affects measurement accuracy but also compromises operational convenience, hindering the widespread adoption of self-metering containers.

[0004] People need tools and containers that can smoothly fill up the liquid and return to the 0 scale position through a reset operation when the liquid can no longer return to the 0 scale position in the measuring pipe, or when the liquid exceeds the 0 scale position. Summary of the Invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a tool for measuring and taking liquid, including a pressure changing device, a metering pipeline, an outflow channel, a liquid taking channel and a reflux channel; wherein, the pressure changing device includes a cylinder and a piston located therein, and the two together form a pressure changing chamber; the pressure changing chamber is provided with an opening connected to the 0 scale end of the metering pipeline; the pressure changing chamber is provided with a space for temporarily accommodating liquid that passes the 0 scale end of the metering pipeline; the liquid taking channel is connected to the metering pipeline through a one-way circulation device leading to the metering pipeline; the end of the metering pipeline can be connected to the outflow channel or the reflux channel; the outflow channel is provided with a shut-off valve and a one-way circulation device leading to the outflow outlet of the outflow channel; the reflux channel is provided with a shut-off valve.

[0006] This liquid metering and access tool is equipped with a reflux channel and shut-off valves in the outflow channel and the reflux channel. When the liquid level in the metering pipe cannot return to the zero scale position during the negative pressure stage, or if there is too much liquid above the zero scale position and cannot be discharged, the outflow channel is closed, the reflux channel is opened, and the pressure transformer applies positive pressure to discharge the gas and liquid in the pressure transformer chamber to the maximum extent possible to a designated location (usually back into the liquid container). Then the outflow channel is opened, the reflux channel is closed, and the pressure transformer applies negative pressure, and the liquid returns to the zero scale line position (predetermined setting state) so that it can be measured and accessed again. The main advantages of this tool for liquid metering and access are that it can be quickly reset, has simple components, and is easy to operate.

[0007] On the other hand, through the positive and negative pressure changes of the pressure transformer, the liquid in the metering pipeline can be filled, positioned, and measured and taken out, which is simple to operate and convenient to measure; the removal process does not require the help of external tools and is isolated from the outside to the greatest extent, which can prevent liquid waste, contamination, oxidation, and prevent liquid volatilization or moisture absorption.

[0008] In the liquid metering and taking tool of the present invention, the piston is located horizontally to the side or obliquely below the cylinder. Such arrangement can optimize the structure and improve operation.

[0009] In the liquid metering and taking tool of the present invention, a water retaining device is provided at the upper end of the metering pipe, which can reduce the problem of liquid stratification and outflow caused by the large diameter of the metering pipe, thereby reducing the measurement accuracy.

[0010] In the liquid metering and dispensing tool of the present invention, the cylinder or the piston is driven by a motor. This motor-driven mechanism can be used in conjunction with other functional components and applied to other fields, such as smart kitchens and smart robots, to address the need for metered liquid dispensing.

[0011] In the liquid metering and taking tool of the present invention, the liquid taking channel and the return channel, except for a section connected to the metering channel, share a single channel, which can save components and optimize the appearance.

[0012] The instrument for measuring and taking liquid of the present invention further comprises a lid or a plug, which can be fixed on a container for holding the liquid to be taken. After being fixed, the lid or the plug is more convenient to use and can also be used for a long time.

[0013] The liquid metering and access tool of the present invention can utilize the same three-way valve for the shutoff valves provided for the outflow channel and the return channel. The metering pipeline connects to the main branch of the three-way valve, while the outflow channel and the return channel connect to the two branches of the three-way valve, respectively. The three-way valve can selectively close one branch while simultaneously opening the other. Using a three-way shutoff valve reduces component count and optimizes operation.

[0014] Furthermore, the three-way valve of the liquid metering and taking tool is controlled by a central knob to close or open the two branches. The three-way valve controlled by the central knob has a simple structure and is easy to operate.

[0015] On the other hand, this liquid metering and taking tool can, as needed, install the one-way flow device that should be installed in the outflow channel in the main branch section of the three-way valve or the branch section leading to the outflow outlet of the outflow channel.

[0016] The present invention also relates to a container comprising the aforementioned tool for measuring and dispensing liquids. The container comprising the aforementioned tool for measuring and dispensing liquids has the advantages of being simple in structure, easy to operate, responsive, convenient for positioning and measuring, and preventing liquid waste, contamination, oxidation, volatilization, and moisture absorption. The container is suitable for daily use by ordinary residents, industrial production measurement applications, and precision measurement by scientific researchers; it can be operated manually by pushing or pulling, or electrically powered. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of the liquid measuring and taking tool described in Example 1;

[0018] Figure 2 is a schematic structural diagram of the liquid metering and taking container described in Example 2;

[0019] Figure 3 This is a partial enlarged view of the liquid measuring and taking container A described in Example 2;

[0020] Figure 4 This is a partial structural diagram of the liquid measuring and taking container described in Example 3;

[0021] Figure 5 is a structural diagram of the liquid measuring and taking tool described in Example 4;

[0022] Figure 6 is a cross-sectional view of the three-way valve described in Example 4;

[0023] Figure 7 This is a structural diagram of the liquid measuring and taking container described in Example 5;

[0024] Figure 8This is a structural diagram of the liquid measuring and taking tool described in Example 6. DETAILED DESCRIPTION

[0025] Example 1

[0026] Figure 1 The figure shows a schematic structural diagram of a liquid metering and dispensing tool according to Example 1. The metering tool comprises a pressure-variable chamber 1, a piston 2, a spring 12, an operating rod 3, a metering pipe 4, a liquid collection channel 5, an outflow channel 6, and a reflux channel 7. The piston 2 is located below the pressure-variable chamber 1; the zero-scale end of the metering pipe 4 connects to the upper bottom portion of the pressure-variable chamber 1, and the end connects to the liquid collection channel 5, the outflow channel 6, and the reflux channel 7. The outflow channel 6 and the reflux channel 7 merge at the front section of the metering pipe 4 and are then separated by a three-way valve 9, leading to the outflow channel outlet and the reflux channel outlet, respectively. A manual control valve 10 on the three-way valve 9 can selectively close either branch of the outflow channel 6 or the reflux channel 7 while simultaneously opening the other branch. The outer surface of the metering pipe 4 is marked with scales indicating the corresponding volume from the zero-scale end; a one-way flow device 8 is provided inside the liquid collection channel 5, which is connected to the metering pipe 4. A one-way flow device 11 is provided in the branch section of the outflow channel 6, which is connected to the outflow channel 6 outlet. Pressing the operating lever 3 causes the piston 2 to move diagonally upward toward the bottom of the pressure-transforming chamber 1, generating positive pressure within the chamber. Releasing the operating lever 3 causes the spring 12 to move the piston 2 diagonally downward within the chamber, generating negative pressure. The stopper 13 secures the liquid metering and dispensing tool to the container containing the liquid.

[0027] Here's how to use this measurement tool:

[0028] For normal use, rotate valve 10 to open outflow channel 6 and close reflux channel 7, then:

[0029] A. When liquid needs to be taken out, the operating lever 3 is pressed, and the piston 2 moves obliquely upward. The pressure-changing chamber 1 generates positive pressure, and positive pressure is applied to the zero-scale end of the metering pipe 4 connected to it. The gas in the pressure-changing chamber 1 first enters the metering pipe 4, pushing the liquid in the metering pipe 4 out through the outflow channel 6. If the positive pressure is continued, the liquid in the pressure-changing chamber 1 enters the metering pipe 4, pushing the liquid in the metering pipe 4 to continue to flow out.

[0030] B. Read the amount of liquid flowing out by measuring the distance the liquid-gas interface moves at the zero scale end in the measuring pipe 4 when pressurization begins;

[0031] C. The piston 2 moves obliquely downward under the push of the spring 12, and the pressure-changing chamber 1 generates negative pressure, which applies negative pressure to the 0 scale end of the metering pipe 4 connected to it, so that the liquid to be taken enters the end of the metering pipe 4 from the liquid taking channel 5;

[0032] D. The liquid to be taken fills the metering pipe 4, and the excess liquid that exceeds the 0 scale end of the metering pipe 4 enters the temporary liquid storage space set in the pressure conversion chamber 1;

[0033] When there is too much or too little liquid in the metering pipe 4 and / or the pressure-changing chamber 1, and the liquid level in the pressure-changing chamber 1 is not on the 0 scale line when the pressure is 0, and a reset is required:

[0034] Rotate the valve 10 to close the outflow channel 6 and open the reflux channel 7. Press the operating lever 3 to move the piston 2 upward. The pressure-changing chamber 1 generates positive pressure, which removes the liquid and gas in the pressure-changing chamber 1 from the reflux channel 7 to the maximum extent possible.

[0035] Rotate the valve 10 to close the reflux channel 7, release the operating lever 3, and the piston 2 moves obliquely downward under the push of the spring 12, generating negative pressure in the pressure-changing chamber 1. The liquid flows along the liquid-taking channel 5 into the metering pipe 4 and reaches the zero scale end, or a small amount of liquid passes the zero scale end and enters the pressure-changing chamber 1.

[0036] The metering reset is completed and the next use can be carried out.

[0037] This measuring tool has a simple structure and is easy to operate, sensitive, fast and accurate.

[0038] Example 2

[0039] Figure 2 The figure shows the structure of the liquid metering container according to Example 2. Figure 3 This is a partial enlarged view of the liquid measuring and taking container A described in Example 2.

[0040] The liquid metering and taking container comprises a pressure changing chamber 1, a piston 2, a connecting rod 3, an electric device 10, a metering pipeline 4, a liquid taking channel 5, an outflow channel 6, a reflux channel 7, a steering valve and a container body 9.

[0041] Piston 2 is located on the right side of pressure-changing chamber 1. Metering conduit 4 connects to the upper portion of pressure-changing chamber 1. Metering conduit 4 is marked with a scale that indicates the amount of liquid flowing out, based on the distance the liquid-gas interface moves at the zero mark on the metering conduit 4. The end of metering conduit 4 connects to liquid extraction channel 5 and to confluence channel 11, the merging channel between outflow channel 6 and reflux channel 7, via a diverter valve (shown at A).

[0042] The steering valve comprises a valve body 15, a valve core 14, and a return spring 16. The valve core 14 is provided with an internal passage 17, which consists of a vertical portion connected to the metering pipe 4 and a transverse portion extending to the sidewalls of the valve core 14. When the pressure in the pressure-changing chamber 1 is positive, the valve core 14 moves downward, and the transverse portion of the internal passage 17 connects with the opening of the merging channel 11 in the valve body 15. When the pressure in the pressure-changing chamber 1 is negative, the valve core 14 moves upward, and the transverse portion of the internal passage 17 connects with the opening of the liquid extraction channel 5 in the valve body 15. The spring 16 maintains the valve core 14 in a neutral position when there is no pressure, disconnecting the transverse portion of the internal passage 17 from either the liquid extraction channel 5 or the merging channel 11. An opening 18 allows the valve core 14 to move smoothly up and down within the valve body 15.

[0043] The converging channel 11 is split by a three-way valve 12, with the two branches leading to the outflow channel 6 and the outflow channel 7, respectively. A manual control handle 13 on the three-way valve 12 allows one branch to be closed while the other is opened. The liquid extraction channel 5 extends to the bottom of the container body 9; the outflow channel 6 flows to the exterior of the container; the reflux channel 7 flows into the interior of the container body 9.

[0044] The method for measuring and taking out liquid from this measuring container is as follows:

[0045] For normal use, rotate the handle 13 to open the outflow channel 6 and close the return channel 7, then:

[0046] 1. When liquid needs to be taken out, the electric device 10 is started, driving the connecting rod 3 and the piston 2 to move to the left, applying positive pressure to the metering pipe 4. The lateral portion of the internal channel 17 of the valve core 14 is connected to the confluence channel 11. The gas in the pressure-changing chamber 1 first enters the metering pipe 4, pushing the liquid in the metering pipe 4 to flow out from the 0 scale end along the outflow channel 6. Continuing to apply positive pressure, the liquid in the pressure-changing chamber 1 enters the metering pipe 4, pushing the liquid in the metering pipe 4 to continue to flow out.

[0047] 2. The amount of outflow is measured by the distance the liquid-gas surface moves from the initial position in the metering pipe 4 when pressurization begins;

[0048] 3. Start the electric device 10, driving the connecting rod 3 and the piston 2 to move to the right, generating negative pressure in the pressure-changing chamber 1. The pressure-changing chamber 1 applies negative pressure to the metering pipe 4 connected to its upper portion. The lateral portion of the internal channel 17 of the valve core 14 is connected to the liquid extraction channel 5, allowing the liquid to be extracted to enter the metering pipe 4 along the liquid extraction channel 5. The gas in the metering pipe 4, or the liquid and gas in the metering pipe 4, enters the pressure-changing chamber 1;

[0049] 4. The liquid to be taken fills the metering pipe 4, and the excess liquid beyond the initial position of the metering pipe 4 enters the pressure transformation chamber 1;

[0050] When there is too much or too little liquid in the metering pipe 4 and / or the air bag 1, and the zero pressure liquid level is not on the 0 scale line and needs to be reset:

[0051] Rotate the handle 13 to close the outflow channel 6 and open the return channel 7, start the electric device 10, and drive the connecting rod 3 and the piston 2 to move to the left. The pressure-changing chamber 1 generates positive pressure, and the liquid and gas in the pressure-changing chamber 1 are discharged to the maximum extent.

[0052] Rotate the handle 13 to close the reflux channel 7, start the electric device 10, and drive the connecting rod 3 and the piston 2 to move to the right. The pressure-changing chamber 1 generates negative pressure, and the liquid enters the metering pipe 4 along the liquid extraction channel 5 and reaches the 0 scale end or a small amount of liquid passes the 0 scale end and enters the pressure-changing chamber 1;

[0053] The metering reset is completed and the next use can be carried out.

[0054] This measuring container and taking method are also sensitive, convenient, fast and accurate.

[0055] Example 3

[0056] Figure 4 The diagram shows the partial structure around the diverter valve of a liquid metering and dispensing container according to Example 3. This container can be considered a variation of Example 2. The confluence channel 11 of Example 2 is eliminated, replaced by a diverging outflow channel 6 and a return channel 7, each connected to the diverter valve. The three-way valve 12 of Example 2 is eliminated, and a shutoff valve 12 and a shutoff valve 13 are provided on the outflow channel 6 and the return channel 7, respectively. All other components are identical to Example 2.

[0057] Its usage is similar to that of Example 2, except that in this embodiment, the shut-off valve 12 and the shut-off valve 13 on the outflow channel 6 and the reflux channel 7 need to be operated separately, while in Example 2, only the handle 13 needs to be rotated.

[0058] Example 4

[0059] Figure 5 FIG2 is a structural diagram of a liquid measuring and taking tool according to Example 4; Figure 6This is a cross-sectional view of the three-way valve 12 in Example 4. This liquid metering and dispensing tool includes a trigger 17, a torsion spring 11, a piston 2, a pressure-variable chamber 7, a metering pipeline 8, a liquid dispensing channel 20, a one-way valve 10 within the liquid dispensing channel 20 that allows flow into the metering pipeline 8, the three-way valve 12, an outflow channel 4, a return channel 21, and a connecting seat 16. The torsion spring 11 pushes the trigger 17 to shift and then reset it. The trigger 17 is connected to the piston 2, whose head is covered with a rubber stopper 6. The piston 2 can reciprocate within the cylinder, causing pressure changes in the pressure-variable chamber 7. The outlet 5 of the pressure-variable chamber 7 is connected to the inlet 1 of the metering pipeline 8 via a hose 19. The metering pipeline 8 is marked with a scale that indicates the amount of liquid flowing out, based on the distance the liquid-gas interface at the zero mark on the metering pipeline 8 moves. The metering pipeline 8 is connected to the liquid inlet 18 of the three-way valve 12 via a one-way valve 9 and a hose 15. The one-way valve 9 allows liquid to flow from the metering pipeline 8 to the three-way valve inlet 18. Control valve 13 of three-way valve 12 controls the flow of liquid from liquid inlet 18 to either return port 14 or outflow channel 4. Return port 14 connects to reflux channel 21. Near the end of metering conduit 8, a one-way valve 10 connects to liquid extraction channel 20, allowing liquid to enter metering conduit 8 from extraction channel 20. Connector 16 secures the metering tool to a container storing liquid.

[0060] The method of measuring and taking out liquid with this measuring tool is as follows:

[0061] During normal use, the control valve 13 of the three-way valve 12 is rotated to open the outflow channel 4 and close the return channel 21, and then:

[0062] 1. When liquid needs to be taken out, press the trigger 17 to generate positive pressure inside the pressure-changing chamber 7. Then, apply positive pressure to the 0 scale end of the metering pipe 8 connected to it. The one-way valve 9 opens, and the gas in the pressure-changing chamber 7 first enters the metering pipe 8, pushing the liquid in the metering pipe 8 out through the three-way valve 12 and the outflow channel 4. Continue to apply positive pressure, and the liquid at the bottom of the pressure-changing chamber 7 enters the metering pipe 8, pushing the liquid in the metering pipe 8 to continue to flow out.

[0063] 2. Read the amount of liquid flowing out by measuring the distance the liquid-gas interface moves at the zero scale end in the metering pipe 8 when pressurization begins;

[0064] 3. Stop pressing and release the trigger 17. The torsion spring 11 pushes the trigger 17 back to its original position. The pressure-changing chamber 7 generates negative pressure, which is applied to the zero-scale end of the metering pipe 8 connected to it. The one-way valve 10 opens, and the liquid to be taken enters the metering pipe 8 along the liquid collection channel 20.

[0065] 4. The liquid to be taken fills the metering pipe 8, and the excess liquid that exceeds the 0 scale end of the metering pipe 8 enters the bottom of the pressure changing chamber 7;

[0066] When there is too little liquid in the metering pipe 8 and / or too much liquid in the pressure changing chamber 7, the liquid level is not on the 0 scale line and needs to be reset:

[0067] Rotate the control valve 13 to close the outflow channel 4 and open the reflux channel 21. Pull the trigger 17 to squeeze the pressure-changing chamber 7 and remove the liquid and gas in the pressure-changing chamber 7 from the reflux channel 21 to the maximum extent possible.

[0068] Rotate the control valve 13 to open the outflow channel 4 and close the return channel 21. Release the trigger 17, and the torsion spring 11 rebounds, generating negative pressure in the pressure-changing chamber 7. The liquid flows along the liquid extraction channel 20 into the metering pipe 8 and reaches the zero scale end, or a small amount of liquid passes the zero scale end and enters the bottom of the pressure-changing chamber 7.

[0069] The metering reset is completed and can be used normally.

[0070] This measuring tool is also sensitive, accurate, easy and quick to use.

[0071] Example 5

[0072] Figure 7 The diagram shows the structure of a liquid metering container according to Example 5. This container utilizes a similar metering tool as that used in Example 4. Specifically, it comprises a trigger 11, a torsion spring 20, a piston 2, a pressure-variable chamber 7, a metering pipeline 8, a liquid withdrawal channel 10 with a one-way valve 19 inside that allows flow into the metering pipeline 8, a three-way valve 12, an outflow channel 4, a return channel 17, and a connecting seat 16. The torsion spring 20 pushes the trigger 11 to shift and then reset it. The trigger 11 connects to the piston 2, whose head is capped with a rubber stopper 6. The piston 2 can reciprocate within the cylinder, causing pressure changes in the pressure-variable chamber 7. The outlet 5 of the pressure-variable chamber 7 is connected to the inlet of the metering pipeline 8 via a hose 14. A scale is marked on the metering pipeline 8, indicating the amount of liquid flowing out based on the distance the liquid-gas interface at the zero mark on the metering pipeline 8 moves. The metering pipeline 8 is connected to the liquid inlet 18 of the three-way valve 12 via a one-way valve 9 and a hose 15. The one-way valve 9 allows liquid to flow from the metering pipeline 8 to the liquid inlet 18. The control valve 13 of the three-way valve 12 controls the flow of liquid from the liquid inlet 18 to either the return channel 17 or the outflow channel 4. Near the end of the metering pipe 8, a one-way valve 19 connects to the liquid extraction channel 10, allowing liquid to enter the metering pipe 8 from the liquid extraction channel 10. The connector 16 secures the metering tool to the container body 1. The securing rib 3 secures the upper metering tool as a single unit.

[0073] The method of measuring and taking out liquid from this measuring container is similar to that in Example 4.

[0074] Example 6

[0075] Figure 8Figure 1 shows a schematic diagram of the structure of a liquid metering and dispensing tool according to Example 6. The liquid metering and dispensing tool includes a trigger 6, a spring 11, a cylinder 2, a piston 8, a rubber stopper 7, a pressure-varying chamber 9, a connecting hose 19, a metering pipe 17, a three-way valve 4, a liquid dispensing channel 1 with a one-way valve 3 inside that allows liquid to flow into the metering pipe 17, an outflow channel 13, a return channel 18, and a connecting seat 12. The spring 11 pushes the trigger 6 to shift and then reset it. The rubber stopper 7 is sleeved on the bottom end of the piston 8. The trigger 6 drives the piston 8 to reciprocate within the cylinder 2, generating positive and negative pressure fluctuations in the pressure-varying chamber 9. The pressure-varying chamber 9 is connected to the zero-scale end of the metering pipe 17 via a hose 19. A scale is marked on the metering pipe 17, indicating the amount of liquid flowing out based on the distance the liquid-gas interface at the zero-scale end of the metering pipe 17 moves. A water baffle 16 is provided at the other end of the metering pipe 17 to prevent the liquid from stratifying and flowing out during pressurization, which could affect metering accuracy. The end of metering pipe 17 is connected to the liquid inlet 10 of three-way valve 4 via connector 14. A one-way valve 15 is located within liquid inlet 10, allowing liquid to flow from metering pipe 17 to the three-way valve 4. The control valve 5 of three-way valve 4 selectively connects to either the outflow channel 13 or the return channel 18. Near the end of metering pipe 17, it connects to the liquid extraction channel 1 via a one-way valve 3, allowing liquid to enter metering pipe 17 from the liquid extraction channel 1. A connector 12 secures the metering tool to a container containing liquid.

[0076] This measuring tool is also sensitive and accurate, and easy and quick to use.

[0077] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, variations, and combinations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the following claims and their equivalents.

Claims

1. A tool for measuring and taking liquid, comprising a pressure transformer, a metering pipe, an outflow channel, a liquid taking channel, and a reflux channel; in, The pressure-changing device includes a cylinder and a piston located therein, which together form a pressure-changing chamber; the pressure-changing chamber is provided with an opening connected to the zero-scale end of the metering pipe; the pressure-changing chamber is provided with a space for temporarily accommodating liquid that has passed the zero-scale end of the metering pipe; The liquid collection channel is connected to the metering pipeline through a one-way flow device leading to the metering pipeline; The end of the metering pipe can be selectively connected to the outflow channel or the reflux channel; The outflow channel is provided with a shutoff valve and a one-way flow device leading to the outflow outlet of the outflow channel; The reflux channel is provided with a cut-off valve.

2. A tool for measuring and taking liquid according to claim 1, characterized in that: The piston is located horizontally to the side or obliquely below the cylinder.

3. A tool for measuring and taking liquid according to claim 1, characterized in that: A water retaining device is provided on the upper portion of the end of the metering pipe.

4. A tool for measuring and taking liquid according to claim 1, characterized in that: The cylinder or the piston is driven by a motor.

5. A tool for measuring and taking liquid according to claim 1, characterized in that: The liquid collection channel and the reflux channel, except for a section connected to the metering pipe respectively, share a channel with other parts.

6. A tool for measuring and taking liquid according to claim 1, characterized in that: The container further comprises a lid or a plug, which can be fixed on the container containing the liquid to be taken.

7. A tool for measuring and taking liquid according to claim 1, characterized in that: The shut-off valves provided for the outflow channel and the reflux channel are the same three-way valve, the metering pipeline is connected to the main branch of the three-way valve, the outflow channel and the reflux channel are respectively connected to the two branches of the three-way valve, and the three-way valve can optionally close any one branch while opening the other branch.

8. A tool for measuring and taking liquid according to claim 7, characterized in that: The three-way valve controls the two branches to be closed or opened through a central knob.

9. A tool for measuring and taking liquid according to claim 7, characterized in that: The one-way flow device provided in the outflow channel is provided in the main branch section of the three-way valve or the branch section leading to the outflow outlet of the outflow channel.

10. A container comprising the tool for measuring and taking liquid according to claim 1.

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