CN107899627B - Initial positioning system and method for liquid metering - Google Patents
Initial positioning system and method for liquid metering Download PDFInfo
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- CN107899627B CN107899627B CN201711148827.7A CN201711148827A CN107899627B CN 107899627 B CN107899627 B CN 107899627B CN 201711148827 A CN201711148827 A CN 201711148827A CN 107899627 B CN107899627 B CN 107899627B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0289—Apparatus for withdrawing or distributing predetermined quantities of fluid
- B01L3/0293—Apparatus for withdrawing or distributing predetermined quantities of fluid for liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F19/00—Calibrated capacity measures for fluids or fluent solid material, e.g. measuring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0605—Metering of fluids
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- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses an initial positioning system for liquid metering and taking. The initial positioning system comprises a metering channel, a pressure changing cavity and a piston, wherein the initial end of the metering channel is communicated with the upper part of the pressure changing cavity; the piston reciprocates in the pressure changing cavity to enable the pressure changing cavity to generate positive and negative pressure changes; simultaneously, the device also comprises a pressure relief opening which is positioned on the wall of the pressure transformation cavity and can be communicated with the outside of the pressure transformation cavity; the reciprocating motion of the piston can pass through the pressure relief opening; when the piston is positioned at the pressure relief opening, the pressure changing cavity is communicated with the inside and the outside, and the maximum volume of the liquid which can be contained in the pressure changing cavity is not less than one third of the total volume in the pressure changing cavity. The initial positioning system is simple to operate and convenient to measure; the taking-out process does not use an external tool, so that the waste, pollution and oxidation of liquid can be prevented, and the volatilization or moisture absorption of the liquid can be prevented; the measuring and taking sensitivity can be improved.
Description
Technical Field
The present invention relates to an initial positioning system for liquid metering, a tool and a container using such an initial positioning system for liquid metering, and an initial positioning method for liquid metering.
Background
When people use liquid in life, the liquid volume is often required to be accurately measured, such as various reagents, liquid pesticides, chemical raw materials, washing liquid, sterilizing liquid, edible oil, liquid medicines and the like. The metering of these liquids typically uses metering tools such as measuring cylinders, measuring cups, pipettes. There are a number of drawbacks to using conventional metering tools, such as waste and contamination caused by contact of the liquid with the metering tool; volatilizing the toxic liquid; oxidizing the liquid with air; loss during transfer affects metering accuracy, etc. In recent years, there have been new technologies such as a self-metering container to solve the above problems. The container with the self-metering function is used for containing the liquid, and an external metering tool is not needed when the container is taken, so that the defects can be avoided.
However, when the conventional self-metering container is used for metering, the initial position of the liquid in the metering channel is difficult to fix due to the influence of factors such as operation force, operation speed, liquid volume in the container body, gas volume in the pressure changing component and the like. The initial metering position cannot be fixed, so that the metering accuracy is disturbed, and the operation convenience is affected. These have prevented the wide spread use of containers with self-metering capabilities.
In life, an initial positioning system or method for liquid metering and taking is needed, so that a liquid volume metering tool or a container with a liquid volume metering and taking function is sensitive to control reaction, each taking process can be accurate and convenient, and the liquid to be metered and taken is influenced by external air or impurities as little as possible.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an initial positioning system for liquid metering and taking.
The initial positioning system comprises a metering channel, a pressure changing cavity and a piston, wherein the initial end of the metering channel is communicated with the upper part of the pressure changing cavity; the piston reciprocates in the pressure transformation cavity to enable the pressure transformation cavity to generate positive and negative pressure changes; simultaneously, the device also comprises a pressure relief opening which is positioned on the wall of the pressure transformation cavity and can be communicated with the outside of the pressure transformation cavity; the reciprocating motion of the piston can pass through the pressure relief opening; when the piston is positioned at the pressure relief opening, and the pressure transformation cavity is communicated with the inside and the outside, the maximum volume of the liquid which can be contained in the pressure transformation cavity is not less than one third of the total volume in the pressure transformation cavity; when the piston moves the pressure changing cavity outwards to negative pressure, liquid in the metering channel flows towards the pressure changing cavity, and liquid passing through the initial position enters the pressure changing cavity; when the piston is positioned at or passes through the pressure relief opening, external air of the pressure transformation cavity enters the pressure transformation cavity from the pressure relief opening; the piston moves inwards to cross the pressure relief opening, when the pressure of the pressure transformation cavity is positive, liquid in the metering channel flows outwards, and gas in the pressure transformation cavity or gas and liquid in the pressure transformation cavity enter the metering channel; the amount of liquid flowing out is measured from the distance moved by the liquid-gas interface at the initial position at the start of positive pressure.
The initial positioning system realizes filling, positioning and metering taking out of liquid in the metering channel by reciprocating movement of the piston in the pressure changing cavity, so that the operation is simple and the metering is convenient; the taking-out process does not use an external tool, so that the waste, pollution and oxidation of liquid can be prevented, and the volatilization or moisture absorption of the liquid can be prevented; the pressure relief opening can enable certain gas to exist in the pressure transformation cavity, so that the existence and visualization of a liquid-gas interface in the metering channel are ensured; the liquid in the pressure-changing cavity is not less than one third of the volume, so that the reaction hysteresis phenomenon caused by excessive gas in the pressure-changing cavity can be prevented, and the metering and taking sensitivity is improved.
The initial positioning system for liquid metering can be provided with one pressure changing cavity, and the piston is positioned at the horizontal side or obliquely below the pressure changing cavity. And the pressure relief opening can be positioned in the middle or upper part of the horizontal height of the pressure transformation cavity. The single pressure-changing cavity is simple in structure, the piston is positioned on the horizontal side or obliquely below the pressure-changing cavity, the pressure relief opening is positioned in the middle or upper part of the horizontal height of the pressure-changing cavity, and the initial positioning system arranged in the way can enable the pressure-changing cavity to store more liquid and can realize the functional requirements of initial positioning and excessive backflow.
The initial positioning system for liquid metering can be provided with a valve which is opened under a certain pressure at a pressure relief opening. The pressure relief opening is provided with a valve which is opened under certain pressure, so that a certain amount of liquid can be stored in the pressure-changing cavity under the condition of adapting to different design requirements.
The initial positioning system for liquid metering can enable the pressure relief opening to be communicated with a pipeline which is opened outside the pressure transformation cavity, and the horizontal position of the opening at the other end of the pipeline is equal to the height of the middle part or the upper part of the pressure transformation cavity. By means of the design of the communicating vessel, a certain amount of liquid can be stored in the pressure-changing cavity.
The initial positioning system for liquid metering is provided with two or more than two pressure changing cavities; the piston is positioned below the transformation cavity or obliquely below the transformation cavity. The two or more than two pressure changing cavities are arranged, and one purpose is to enable part of the pressure changing cavities to store excessive liquid in the pressure changing process, prevent reaction hysteresis caused by excessive gas in the pressure changing cavities and improve metering and taking sensitivity.
Further, an initial positioning system for metering and taking the liquid is provided, wherein one pressure transformation cavity is provided with the pressure relief opening. The pressure relief opening is arranged in part of the pressure transformation cavity, so that a certain amount of gas can be stored in the pressure transformation cavity, and a liquid-gas interface in the metering channel is visible.
When the piston is positioned at the pressure relief opening, the maximum volume of the liquid which can be contained in the pressure transformation cavity is not less than two thirds of the total volume in the pressure transformation cavity when the pressure transformation cavity is communicated with the inside; further, when the piston is located at the pressure relief opening, the pressure changing cavity is communicated with the inside and the outside, so that the maximum volume of the liquid which can be contained in the pressure changing cavity is not lower than ninety percent of the total volume in the pressure changing cavity. In general, the higher the liquid ratio in the pressure-changing chamber is, the higher the measurement sensitivity is. However, too little gas in the pressure-changing cavity may cause the disadvantage that excessive liquid is mixed with the liquid in the metering channel again during pressurization.
The invention also comprises a metering tool which comprises the initial positioning system for metering and taking the liquid. The invention also includes a metering container comprising the initial positioning system for liquid metering and taking as described above. The metering tool or the metering container comprising the initial positioning system has the advantages of sensitive response, simple operation, convenient positioning and metering, liquid waste, pollution and oxidation prevention, liquid volatilization prevention or moisture absorption and the like.
The invention also comprises an initial positioning method for liquid metering and taking, which comprises the following steps:
A. pulling a piston in the pressure changing cavity outwards to generate negative pressure in the pressure changing cavity, and applying negative pressure in a metering channel communicated with the upper part of the pressure changing cavity to enable liquid to be taken to enter the metering channel, and enabling gas in the metering channel or liquid and gas in the metering channel to enter the pressure changing cavity;
B. the metering channel is filled with liquid to be taken, and excessive liquid which passes through the metering initial position enters the pressure changing cavity;
C. when the piston is positioned at or passes over the position of the pressure relief opening arranged on the wall of the pressure transformation cavity, and the pressure transformation cavity is communicated with the outside, the piston is stopped from being pulled; external gas enters the pressure changing cavity, negative pressure in the pressure changing cavity disappears, excessive liquid does not enter the pressure changing cavity any more, and the metering initial position is determined; the liquid in the pressure changing cavity flows outwards from the pressure relief port and is recovered through the backflow channel;
D. when liquid is required to be taken out, the piston in the pressure changing cavity is pushed inwards to reversely move beyond the position of the pressure relief opening, and the pressure changing cavity is isolated from the outside; the maximum volume of the resident liquid in the pressure changing cavity is not lower than one third of the total volume in the pressure changing cavity at the moment, or not lower than two thirds of the total volume in the pressure changing cavity at the moment, or not lower than ninety percent of the total volume in the pressure changing cavity at the moment;
E. continuously pushing the piston to compress the pressure changing cavity, adding positive pressure into the metering channel, enabling gas in the pressure changing cavity to enter the metering channel at first, and pushing liquid in the metering channel to flow out from an initial position; if the positive pressure is continuously applied, the liquid in the pressure-changing cavity enters the metering channel to push the liquid in the metering channel to continuously outflow;
F. the amount of the outflow is measured from the start of pressurization by measuring the distance of the liquid-gas surface movement of the initial position in the passage.
The initial positioning method for liquid metering and taking has the advantages of simple operation, convenient positioning and metering, capability of preventing liquid from being wasted, polluted and oxidized, liquid volatilization or moisture absorption, high operation sensitivity and the like. The device is suitable for daily application of common residents, industrial production metering application and precise metering application of scientific researchers; the piston can be manually pushed and pulled for operation or driven by electricity.
Drawings
FIG. 1 is a schematic view of the liquid measuring tool according to embodiment 1;
FIG. 2 is a schematic view showing the structure of a liquid metering container according to embodiment 2;
FIG. 3 is an enlarged view of a portion of the liquid measuring container A according to example 2;
FIG. 4 is a schematic view showing the structure of a liquid container according to embodiment 3;
FIG. 5 is a schematic view showing the structure of a liquid container according to example 4;
fig. 6 is a schematic structural view of the liquid container according to embodiment 5.
Detailed Description
Example 1
Fig. 1 is a schematic view showing a structure of a metering tool including an initial positioning system for liquid metering according to embodiment 1. The initial positioning system of the metering tool comprises a pressure changing cavity 1, a piston 2, an operating rod 3, a metering channel 4 and a pressure relief opening 8. The piston 2 is located the horizontal side of the pressure changing cavity 1, the metering channel 4 is communicated with the upper part of the pressure changing cavity 1, the pressure relief opening 8 is located the middle upper part of the horizontal position of the pressure changing cavity 1, penetrates through the cavity wall of the pressure changing cavity 1, and can pass through the pressure relief opening 8 to reach the right side of the pressure relief opening 8 when the piston 2 reciprocates. When the piston 2 is positioned at the pressure relief opening 8 and the pressure changing cavity 1 is communicated with the inside and the outside, the maximum volume of the liquid which can be contained in the pressure changing cavity 1 is two thirds of the total volume in the pressure changing cavity. The semi-cylindrical recovery device 9 can collect and recover the liquid overflowed from the pressure relief port 8, and the liquid flows back to the liquid extraction place through the backflow channel 7. The metering channel 4 is provided with scales, and the amount of the flowing liquid is displayed according to the moving distance of the liquid-gas interface at the starting end of the metering channel 4.
The metering channel 4 is communicated with the cavity 12, the cavity 12 is communicated with the liquid taking channel 5 through the one-way valve 10, and is communicated with the outflow channel 6 through the one-way valve 11; wherein the one-way valve 10 only allows liquid to flow from the liquid taking channel 5 to the cavity 12, and the one-way valve 11 only allows liquid to flow from the cavity 12 to the outflow channel 6. A plug 13 with through openings for the tapping channel 5 and the return channel 7 can fix the metering tool to the container containing the liquid to be tapped.
When the piston 2 moves outwards to change the negative pressure of the pressure chamber 1, the liquid in the metering channel 4 flows towards the direction of the pressure chamber 1, and the liquid which passes over the initial position enters the pressure chamber 1; when the piston 2 passes over the pressure relief opening 8, external air enters the pressure transformation cavity 1 from the pressure relief opening 8; when the piston 2 moves inwards to cross the pressure relief opening 8 and the pressure changing cavity 1 is positive pressure, the liquid in the metering channel 4 flows outwards, and the gas in the pressure changing cavity 1 or the gas and the liquid in the pressure changing cavity 1 enter the metering channel 4; the amount of liquid flowing out is measured from the distance moved by the liquid-gas interface at the initial position at the start of positive pressure.
The steps for metering out liquid of this metering tool are as follows:
the operating rod 3 is pulled outwards, the piston 2 moves to the right side, negative pressure is generated in the pressure changing cavity 1, the one-way valve 11 is closed, liquid to be taken out flows to the metering channel 4 through the liquid taking channel 5, the one-way valve 10 and the cavity 12, and liquid exceeding the initial end of the metering channel 4 flows into the pressure changing cavity 1. When the piston 2 reaches the position of the pressure relief opening 8, external air enters the pressure changing cavity 1, negative pressure in the pressure changing cavity 1 disappears, and liquid in the liquid taking channel 5, the cavity 12 and the metering channel 4 stops flowing. The metering channel 4 is filled with liquid and the initial positioning is completed ready for removal. The liquid in the pressure changing cavity 1 flows outwards from the pressure relief opening 8 and is recovered through the backflow channel 7.
When the liquid is required to be taken out, the operating rod 3 is pushed inwards, the piston 2 moves leftwards, and if the liquid level in the pressure changing cavity 1 exceeds the pressure relief opening 8, the liquid flows outwards from the pressure relief opening 8. When the piston 2 is positioned at the pressure relief opening 8, the maximum volume of the liquid in the pressure changing cavity 1 is not less than two thirds of the total volume in the pressure changing cavity 1. The piston 2 is pushed to pass through the pressure relief opening 8 continuously, positive pressure is generated in the pressure changing cavity 1, the one-way valve 10 is closed, and the liquid flows outwards through the metering channel 4, the cavity 12, the one-way valve 11 and the outflow channel 6. The amount of liquid removed is known from the distance the liquid-gas interface at the initial end of the metering channel 4 moves.
Because of the liquid in the pressure-variable cavity 1, compared with the traditional liquid volume measuring tool, the measuring tool and the measuring method are sensitive, convenient, quick and accurate.
Example 2
Fig. 2 is a schematic view showing the structure of the liquid-metering container according to embodiment 2, and fig. 3 is a partially enlarged view of the liquid-metering container a according to embodiment 2.
The liquid metering and taking container comprises an initial positioning system consisting of a pressure changing cavity 1, a piston 2, a connecting rod 3, a metering channel 4 and a pressure relief opening 8, a bowl-shaped object 9, a backflow channel 7, a liquid taking channel 5, an outflow channel 6, a steering valve, a container main body 13 and facilities convenient to take and operate, wherein the bowl-shaped object is covered outside the pressure relief opening 8, the facilities convenient to take and operate comprise a support 10 fixed on the outer wall of the pressure changing cavity 1, an operating rod 11 movably connected with the support 10 and the connecting rod 3, and a spring 12 positioned between the support 10 and the operating rod 11.
Wherein, piston 2 is located pressure transformation chamber 1 oblique below, and measurement passageway 4 intercommunication pressure transformation chamber 1 upper portion, and pressure release mouth 8 is located pressure transformation chamber 1 horizontal position's well upper portion, link up pressure transformation chamber 1 chamber wall, can cross pressure release mouth 8 when piston 2 reciprocating motion, reach pressure release mouth 8 left side below. When the piston 2 is positioned at the pressure relief opening 8 and the pressure changing cavity 1 is communicated with the inside and the outside, the maximum volume of the liquid which can be contained in the pressure changing cavity 1 is one third of the total volume in the pressure changing cavity. The bowl 9 can collect and recycle the liquid overflowed from the pressure relief port 8 and flow back into the container body 13 through the backflow channel 7. The metering channel 4 is provided with scales, and the amount of the flowing liquid is displayed according to the moving distance of the liquid-gas interface at the starting end of the metering channel 4.
The metering channel 4 communicates with the liquid taking channel 5 and the outflow channel 6 through a steering valve (shown at A). The diverter valve comprises a valve body 15, a valve core 14 and a return spring 16, the valve core 14 being provided with an internal passage 17, the internal passage 17 comprising a vertical portion which communicates centrally with the metering passage 4 and a lateral portion which opens into a side wall of the valve core 14. The valve core 14 moves downwards when the pressure of the pressure changing cavity 1 is positive, and the transverse part of the inner channel 17 is communicated with the opening of the outflow channel 6 on the valve body 15; the valve core 14 moves upwards when the pressure of the pressure changing cavity 1 is negative, and the transverse part of the inner channel 17 is communicated with the liquid taking channel 5 at the opening of the valve body 15. The return spring 16 makes the valve core 14 at the middle position when no pressure exists, and the transverse part of the inner channel 17 is not communicated with the liquid taking channel 5 and the outflow channel 6. The opening 18 allows the valve core 14 to smoothly move up and down in the cavity of the valve body 15.
The steps for metering out the liquid in the metering container are as follows:
1. stopping pressing the operating rod 11 to the upper right, pushing the operating rod 11 to the lower left by the spring 12, driving the connecting rod 3 and the piston 2 to move to the lower left, generating negative pressure in the pressure changing cavity 1, applying negative pressure in the pressure changing cavity 1 to the metering channel 4 communicated with the upper part of the pressure changing cavity, communicating the transverse part of the internal channel 17 of the valve core 14 with the liquid taking channel 5, and enabling liquid to be taken to enter the metering channel 4, and enabling gas in the metering channel 4 or liquid and gas in the metering channel 4 to enter the pressure changing cavity 1;
2. the metering channel 4 is filled with liquid to be taken, and excessive liquid which passes through the initial position of the metering channel 4 enters the pressure changing cavity 1;
3. the piston 2 reaches the position of a pressure relief opening 8 arranged on the wall of the pressure transformation cavity 1, so that the pressure transformation cavity 1 is communicated with the outside; the negative pressure in the pressure changing cavity 1 disappears, the transverse part of the internal channel 17 of the valve core 14 is disconnected with the liquid taking channel 5, excessive liquid does not enter the pressure changing cavity 1 any more, and the metering initial position is determined; part of liquid in the pressure changing cavity 1 flows outwards through the pressure relief opening 8 and is recovered into the container main body 13 through the backflow channel 7;
4. when liquid is required to be taken out, the operating rod 11 is pressed, the connecting rod 3 and the piston 2 in the pressure changing cavity 1 are pushed to the right and the upper side, so that the piston 2 reversely moves beyond the position of the pressure relief opening 8, and the pressure changing cavity 1 is isolated from the outside; at this time, the maximum volume of the liquid which can be contained in the pressure changing cavity 1 is not less than one third of the total volume in the pressure changing cavity;
5. continuing to press the operating rod 11, pushing the piston 2 to compress the pressure changing cavity 1, adding positive pressure into the metering channel 4, communicating the transverse part of the internal channel 17 of the valve core 14 with the outflow channel 6, enabling gas in the pressure changing cavity 1 to enter the metering channel 4 at first, and pushing liquid in the metering channel 4 to outflow from the initial position; if the positive pressure is continuously applied, the liquid in the pressure changing cavity 1 enters the metering channel 4 to push the liquid in the metering channel 4 to continuously outflow;
6. the amount of the outflow is measured from the initial position of the liquid-gas surface movement distance in the measurement passage 4 at the start of pressurization.
The metering container is sensitive, convenient, quick and accurate.
Example 3
Fig. 4 is a schematic view showing the structure of a liquid metering container according to embodiment 3. The liquid metering and taking container comprises an initial positioning system consisting of a pressure changing cavity 1, a piston 2, a connecting rod 3, a metering channel 4, a pressure relief opening 8 provided with a valve opened under certain pressure, a backflow channel 7 connected to the outside of the pressure relief opening 8, an opening 9 arranged on the upper part of the backflow channel 7, a liquid taking channel 5, an internal one-way valve 10 thereof, an outflow channel 6, an internal one-way valve 11 thereof, a container main body 13 and an electric device 12 connected with the connecting rod 3.
Wherein, piston 2 is located pressure transformation chamber 1 below, and measuring channel 4 intercommunication pressure transformation chamber 1 upper right portion, and pressure release mouth 8 is located pressure transformation chamber 1 horizontal position's lower part, link up pressure transformation chamber 1 chamber wall, can cross pressure release mouth 8 when piston 2 reciprocating motion, reach pressure release mouth 8 below. The pressure relief port 8 is fitted with a valve that opens under a certain pressure. When the liquid level in the pressure changing cavity 1 is higher than one third of the distance from the pressure relief opening 8 to the top of the pressure changing cavity 1, the valve is pressed and opened, external air enters the pressure changing cavity 1, and liquid in the pressure changing cavity 1 flows back into the container through the pressure relief opening 8 and the backflow channel 7. When the level of liquid in the pressure-changing cavity 1 is lower than one third of the distance from the pressure relief opening 8 to the top of the pressure-changing cavity 1, the valve is closed. An opening 9 is arranged at the upper part of the backflow channel 7, so that the pressure outside the pressure relief opening 8 is zero, and the phenomenon that liquid in the backflow channel 7 affects a valve in the pressure relief opening 8 to cause the valve to be opened erroneously is prevented. The liquid taking channel 5 and the internal one-way valve 10 thereof can be opened upwards in a one-way, and the outflow channel 6 and the internal one-way valve 11 thereof can be opened leftwards in a one-way. The electric device 12 connected with the connecting rod 3 can be controlled by a panel, and the piston 2 is pushed to reciprocate by the connecting rod 3.
When the piston 2 is positioned at the pressure relief opening 8 and the pressure changing cavity 1 is internally and externally communicated, the maximum volume of the liquid which can be contained in the pressure changing cavity 1 is more than one third of the total volume in the pressure changing cavity, the volume of the gas in the pressure changing cavity 1 is smaller, and the liquid in the metering channel 4 reacts more sensitively along with the reciprocating movement of the piston. The liquid flowing out of the pressure relief port 8 flows back into the container body 13 through the return passage 7. The metering channel 4 is provided with scales, and the amount of the flowing liquid is displayed according to the moving distance of the liquid-gas interface of the starting end on the right side of the metering channel 4.
The steps for metering out the liquid in the metering container are as follows:
1. the piston 2 is positioned above the pressure relief opening 8, the electric device 12 is started, the connecting rod 3 drives the piston 2 to move downwards, negative pressure is generated in the pressure changing cavity 1, the pressure changing cavity 1 applies negative pressure to the metering channel 4 communicated with the upper right part of the pressure changing cavity, the one-way valve 10 is opened, liquid to be taken enters the metering channel 4 through the liquid taking channel 5, and gas in the metering channel 4 or liquid and gas in the metering channel 4 enter the pressure changing cavity 1;
2. the metering channel 4 is filled with liquid to be taken, and excessive liquid which passes through the initial position of the metering channel 4 enters the pressure changing cavity 1;
3. when the piston 2 is positioned at the pressure relief opening 8, the electric device 12 is closed, the connecting rod 3 stops driving the piston 2, excessive liquid does not enter the pressure changing cavity 1 any more, and the metering initial position is determined; part of liquid in the pressure changing cavity 1 flows back into the container main body 13 through the pressure relief opening 8 and the backflow channel 7;
4. when liquid is required to be taken out, the electric device 12 is started, the piston 2 in the pressure changing cavity 1 is driven to move upwards through the connecting rod 3, so that the piston 2 passes through the pressure relief opening 8, and the pressure changing cavity 1 is isolated from the outside; at this time, the maximum volume of the liquid which can be contained in the pressure changing cavity 1 is not less than one third of the total volume in the pressure changing cavity;
5. the electric device 12 continuously pushes the piston 2 to compress the pressure changing cavity 1 through the connecting rod 3, positive pressure is added into the metering channel 4, the one-way valve 11 in the outflow channel 6 is opened, gas in the pressure changing cavity 1 firstly enters the metering channel 4, and liquid in the metering channel 4 is pushed to outflow from an initial position; if the positive pressure is continuously applied, excessive liquid in the pressure-changing cavity 1 enters the metering channel 4 to push the liquid in the metering channel 4 to continuously outflow;
6. the amount of the outflow is measured from the initial position of the liquid-gas surface movement distance in the measurement passage 4 at the start of pressurization.
The metering container is also sensitive and accurate to take, and is convenient and quick to use.
Example 4
Fig. 5 is a schematic view showing a structure of a liquid metering container according to embodiment 4. The liquid metering and taking container comprises an initial positioning system consisting of a pressure changing cavity 1, a piston 2, a connecting rod 3, a metering channel 4 and a pressure relief opening 8, an inverted J-shaped pipe 9 communicated with the outside of the pressure relief opening 8, a backflow channel 7, a liquid taking channel 5, an internal one-way valve 10, an outflow channel 6, an internal one-way valve 11, a container main body 13 and an electric device 12 connected with the connecting rod 3.
The piston 2 is located the transformation chamber 1 right side, and measurement passageway 4 intercommunication transformation chamber 1 left side upper portion, and pressure release mouth 8 is located the lower part of transformation chamber 1 horizontal position, link up transformation chamber 1 chamber wall, can cross pressure release mouth 8 when piston 2 reciprocating motion, reach pressure release mouth 8 right side. The outside of the pressure relief opening 8 is communicated with an inverted J-shaped pipe 9. When the liquid level position in the pressure changing cavity 1 is higher than the high-end outlet position of the inverted J-shaped pipe 9, the liquid in the pressure changing cavity 1 flows back into the container main body 13 through the pressure relief opening 8 and the backflow channel 7, and the air outside the pressure changing cavity 1 enters the pressure changing cavity 1. The one-way valve 10 in the liquid taking channel 5 can be opened upwards in a one-way, and the one-way valve 11 in the outflow channel 6 can be opened leftwards in a one-way. The electric device 12 connected with the connecting rod 3 can be electrically controlled, and the piston 2 is pushed to reciprocate by the connecting rod 3.
When the piston 2 is positioned at the pressure relief opening 8, namely the pressure changing cavity 1 is communicated with the inside and the outside, the maximum volume of the liquid which can be contained in the pressure changing cavity 1 accounts for more than 90 percent of the total volume in the pressure changing cavity, the volume of the gas in the pressure changing cavity 1 is small, and the liquid in the metering channel 4 reacts sensitively along with the reciprocating movement of the piston. The liquid flowing out of the pressure relief port 8 flows back into the container main body 13 through the inverted J-shaped pipe 9 and the backflow channel 7. The metering channel 4 is provided with scales, and the amount of the flowing liquid is displayed according to the moving distance of the liquid-gas interface at the starting end of the metering channel 4.
The steps for metering out the liquid in the metering container are as follows:
1. the piston 2 is positioned at the left side of the pressure relief opening 8, the electric device 12 is started, the connecting rod 3 drives the piston 2 to move rightwards, negative pressure is generated in the pressure changing cavity 1, the pressure changing cavity 1 applies negative pressure to the metering channel 4 communicated with the upper part of the left side, the one-way valve 10 is opened, liquid to be taken enters the metering channel 4 through the liquid taking channel 5, and gas in the metering channel 4 or liquid and gas in the metering channel 4 enter the pressure changing cavity 1;
2. the metering channel 4 is filled with liquid to be taken, and excessive liquid which passes through the initial position of the metering channel 4 enters the pressure changing cavity 1;
3. when the piston 2 is positioned at the pressure relief opening 8, the electric device 12 is closed, the connecting rod 3 stops driving the piston 2, excessive liquid does not enter the pressure changing cavity 1 any more, and the metering initial position is determined; the liquid in the pressure changing cavity 1, which is higher than the outlet of the inverted J-shaped pipe 9, flows into the container main body 13 through the pressure relief opening 8, the inverted J-shaped pipe 9 and the backflow channel 7.
4. When liquid is required to be taken out, the electric device 12 is started, the piston 2 in the pressure changing cavity 1 is driven to move leftwards through the connecting rod 3, so that the piston 2 passes through the pressure relief opening 8, and the pressure changing cavity 1 is isolated from the outside; at this time, the maximum volume of the liquid in the pressure changing cavity 1 is not less than 90% of the total volume in the pressure changing cavity 1;
5. the electric device 12 continuously pushes the piston 2 to compress the pressure changing cavity 1 through the connecting rod 3, positive pressure is added into the metering channel 4, the one-way valve 11 in the outflow channel 6 is opened, gas in the pressure changing cavity 1 firstly enters the metering channel 4, and liquid in the metering channel 4 is pushed to outflow from an initial position; if the positive pressure is continuously applied, the liquid in the pressure changing cavity 1 enters the metering channel 4 to push the liquid in the metering channel 4 to continuously outflow;
6. the amount of the outflow is measured from the initial position of the liquid-gas surface movement distance in the measurement passage 4 at the start of pressurization.
The metering container is also sensitive and accurate to take, and is convenient and quick to use.
Example 5
Fig. 6 is a schematic view showing the structure of a liquid metering container according to embodiment 5.
The liquid metering and taking container comprises an initial positioning system consisting of a pressure changing cavity 1, a piston 2, a connecting rod 3, a metering channel 4 and a pressure relief opening 8, a backflow channel 7, a liquid taking channel 5, an outflow channel 6, a container main body 13 and an operating rod 12 connected with the connecting rod 3.
Wherein, the pressure changing cavity 1 and the piston 2 are two. The bottoms of the two pressure changing cavities 1 are independent and the upper parts are communicated, a piston 2 which can move up and down in each pressure changing cavity is arranged at the lower side of each pressure changing cavity, and a connecting rod 3 is connected with the two pistons 2 and an operating rod 12. The metering channel 4 is communicated with the top of the left-side variable-pressure cavity 1, and the pressure relief opening 8 is positioned at the middle lower part of the right-side variable-pressure cavity 1 and penetrates through the cavity wall of the variable-pressure cavity 1. The right piston 2 can pass through the pressure relief opening 8 and reach the lower part of the pressure relief opening 8 when reciprocating. When the right piston 2 is positioned at the pressure relief opening 8, the pressure changing cavity 1 is internally and externally communicated, and the liquid stored in the left pressure changing cavity cannot flow out, so that the maximum volume of the liquid which can be contained in the two pressure changing cavities 1 is more than about one third of the total volume in the pressure changing cavities 1. The liquid overflowed from the pressure relief port 8 flows back into the container body 13 through the return passage 7. The metering channel 4 is provided with scales, and the amount of the flowing liquid is displayed according to the moving distance of the liquid-gas interface of the starting end at the left side of the metering channel 4. The one-way valve 10 in the liquid taking channel 5 can be opened upwards in one direction, and the one-way valve 11 in the outflow channel 6 can be opened rightwards in one direction.
The steps for metering out the liquid in the metering container are as follows:
1. the right piston 2 is positioned above the pressure relief opening 8, the operating rod 12 is pressed downwards, the connecting rod 3 drives the piston 2 to move downwards, negative pressure is generated in the two pressure changing cavities 1, negative pressure is applied to the metering channel 4 communicated with the top of the left pressure changing cavity, the one-way valve 10 is opened, liquid to be taken enters the metering channel 4 through the liquid taking channel 5 through the one-way valve 10, and gas in the metering channel 4 or liquid and gas in the metering channel 4 enter the pressure changing cavity 1;
2. the metering channel 4 is filled with liquid to be taken, and excessive liquid which passes through the initial position of the metering channel 4 enters the pressure changing cavity 1;
3. when the piston 2 is positioned at the pressure relief opening 8, the operating rod 12 is stopped being pressed, the connecting rod 3 stops driving the piston 2, excessive liquid does not enter the pressure changing cavity 1 any more, and the metering initial position is determined; the liquid in the right pressure changing cavity 1, which is higher than the pressure relief opening 8, flows into the container main body 13 through the pressure relief opening 8 and the backflow channel 7.
4. When liquid is required to be taken out, the operating rod 12 is lifted upwards, and the connecting rod 3 drives the two pistons 2 in the pressure changing cavity 1 to move upwards, so that the pistons 2 pass through the pressure relief opening 8, and the pressure changing cavity 1 is isolated from the outside; at this time, the maximum volume of the liquid contained in the pressure changing cavity 1 is not less than one third of the total volume in the pressure changing cavity;
5. continuously pushing the piston 2 to compress the pressure changing cavity 1 upwards through the operating rod 12 and the connecting rod 3, adding positive pressure into the metering channel 4, opening the one-way valve 11 in the outflow channel 6, enabling gas in the pressure changing cavity 1 to enter the metering channel 4 at first, and pushing liquid in the metering channel 4 to outflow from an initial position; if the positive pressure is continuously applied, the liquid in the left pressure changing cavity 1 enters the metering channel 4 to push the liquid in the metering channel 4 to continuously outflow;
6. the liquid-gas interface in the metering passage 4 is moved from the initial position at the start of pressurization to meter the amount of outflow.
The metering container is sensitive, convenient, quick and accurate.
Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, variations and combinations of the embodiments may be made without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An initial positioning system for liquid metering and taking comprises a metering channel, a pressure changing cavity and a piston, wherein the initial end of the metering channel is communicated with the upper part of the pressure changing cavity; the piston reciprocates in the pressure transformation cavity to enable the pressure transformation cavity to generate positive and negative pressure changes; the method is characterized in that:
the piston is positioned at the horizontal side or obliquely below the transformation cavity;
the initial positioning system also comprises a pressure relief opening which is positioned on the wall of the pressure transformation cavity and can be communicated with the outside of the pressure transformation cavity; the reciprocating motion of the piston can pass through the pressure relief opening;
when the piston is positioned at the pressure relief opening, and the pressure changing cavity is communicated with the inside and the outside, the volume of the liquid which can be contained in the pressure changing cavity is not less than one third of the total volume in the pressure changing cavity;
when the piston moves outwards to enable the pressure changing cavity to be negative pressure, liquid in the metering channel flows towards the pressure changing cavity, and liquid passing through the initial position enters the pressure changing cavity; when the piston is positioned at or passes through the pressure relief opening, external air of the pressure transformation cavity enters the pressure transformation cavity from the pressure relief opening;
the piston moves inwards to cross the pressure relief opening, when the pressure of the pressure transformation cavity is positive, liquid in the metering channel flows outwards, and gas in the pressure transformation cavity or gas and liquid in the pressure transformation cavity enter the metering channel;
the amount of liquid flowing out is measured from the distance moved by the liquid-gas interface at the initial position at the start of positive pressure.
2. An initial positioning system for liquid metering according to claim 1, wherein: the pressure relief opening is positioned in the middle or upper part of the horizontal height of the pressure transformation cavity.
3. An initial positioning system for liquid metering according to claim 1, wherein: the pressure relief opening is provided with a valve which is opened under a certain pressure.
4. An initial positioning system for liquid metering according to claim 1, wherein: the pressure relief opening is communicated with a pipeline which is opened outside the pressure transformation cavity, and the horizontal position of the opening at the other end of the pipeline is equal to the height of the middle part or the upper part of the pressure transformation cavity.
5. An initial positioning system for liquid metering according to claim 1, wherein: more than two transformation cavities are arranged; the piston is positioned below the transformation cavity or obliquely below the transformation cavity.
6. An initial positioning system for liquid metering according to claim 5, wherein: one of the pressure changing cavities is provided with the pressure relief opening.
7. An initial positioning system for liquid metering according to claim 1, wherein: when the piston is positioned at the pressure relief opening, and the pressure transformation cavity is communicated with the inside and the outside, the volume of the liquid which can be contained in the pressure transformation cavity is not less than two thirds of the total volume in the pressure transformation cavity; further, when the piston is located at the pressure relief opening, and the pressure transformation cavity is communicated with the inside and the outside, the volume of the liquid which can be contained in the pressure transformation cavity is not less than ninety percent of the total volume in the pressure transformation cavity.
8. A metering tool or metering container comprising the initial positioning system for metering of liquids of claim 1.
9. An initial positioning method for liquid metering and taking, which is realized based on the initial positioning system of any one of claims 1 to 7, and is characterized by comprising the following steps:
A. pulling a piston in the pressure changing cavity outwards to generate negative pressure in the pressure changing cavity, and applying negative pressure in a metering channel communicated with the upper part of the pressure changing cavity to enable liquid to be taken to enter the metering channel, and enabling gas in the metering channel or liquid and gas in the metering channel to enter the pressure changing cavity;
B. the metering channel is filled with liquid to be taken, and excessive liquid which passes through the metering initial position enters the pressure changing cavity;
C. when the piston is positioned at or passes over the position of the pressure relief opening arranged on the wall of the pressure transformation cavity, and the pressure transformation cavity is communicated with the outside, the piston is stopped from being pulled; external gas enters the pressure changing cavity, negative pressure in the pressure changing cavity disappears, excessive liquid does not enter the pressure changing cavity any more, and the metering initial position is determined; the liquid in the pressure changing cavity flows outwards from the pressure relief port and is recovered through the backflow channel;
D. when liquid is required to be taken out, the piston in the pressure changing cavity is pushed inwards to reversely move beyond the position of the pressure relief opening, and the pressure changing cavity is isolated from the outside; the volume of the liquid residing in the pressure changing cavity is not lower than one third of the total volume in the pressure changing cavity at the moment, or not lower than two thirds of the total volume in the pressure changing cavity at the moment, or not lower than ninety percent of the total volume in the pressure changing cavity at the moment;
E. continuously pushing the piston to compress the pressure changing cavity, adding positive pressure into the metering channel, enabling gas in the pressure changing cavity to enter the metering channel at first, and pushing liquid in the metering channel to flow out from an initial position; if the positive pressure is continuously applied, the liquid in the pressure-changing cavity enters the metering channel to push the liquid in the metering channel to continuously outflow;
F. the amount of the outflow is measured from the start of pressurization by measuring the distance of the liquid-gas surface movement of the initial position in the passage.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711148827.7A CN107899627B (en) | 2017-11-17 | 2017-11-17 | Initial positioning system and method for liquid metering |
| KR1020207016801A KR20200081482A (en) | 2017-11-17 | 2018-11-19 | Initial positioning system and method for liquid metering and use |
| PCT/CN2018/116282 WO2019096319A1 (en) | 2017-11-17 | 2018-11-19 | Initial positioning system and method for liquid measuring and removing |
| ZA2019/08582A ZA201908582B (en) | 2017-11-17 | 2019-12-23 | Initial positioning system and method for measuring and taking liquid |
| US16/876,124 US11253851B2 (en) | 2017-11-17 | 2020-05-18 | Initial positioning system and method for liquid measuring and removing |
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| CN201711148827.7A CN107899627B (en) | 2017-11-17 | 2017-11-17 | Initial positioning system and method for liquid metering |
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| CN107899627A CN107899627A (en) | 2018-04-13 |
| CN107899627B true CN107899627B (en) | 2023-09-12 |
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| KR20200081482A (en) * | 2017-11-17 | 2020-07-07 | 베이징 레드-시 테크 컴퍼니 리미티드 | Initial positioning system and method for liquid metering and use |
| CN108627212A (en) * | 2018-05-10 | 2018-10-09 | 北京红海科技开发有限公司 | Tool, container and the method taken for liquid meter |
| CN114917840B (en) * | 2021-11-26 | 2023-09-01 | 刘贝 | Device and method for quantitatively adding solid powder into reaction kettle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321540A (en) * | 2000-04-30 | 2001-11-14 | 中国石油化工集团公司 | Membrane back-washing equipment of cross-flow type membrane filtration system |
| EP1195518A3 (en) * | 2000-10-04 | 2003-07-02 | Robert Bosch Gmbh | Method and device for dosed pumping |
| CN201991845U (en) * | 2011-03-16 | 2011-09-28 | 东莞市尚正机电科技有限公司 | High-speed heavy-load linear reciprocating-movement body running energy storing device |
| CN202321227U (en) * | 2011-09-28 | 2012-07-11 | 厦门柏润氟材料科技有限公司 | Manual quantitative liquid taking device |
| CN202538805U (en) * | 2012-03-30 | 2012-11-21 | 苏丹 | Reusable quantitative liquid transfer device |
| CN105214748A (en) * | 2015-10-14 | 2016-01-06 | 南京白云化工环境监测有限公司 | A kind of sampler of quantitative liquid getting |
| CN206459818U (en) * | 2016-11-14 | 2017-09-01 | 深圳市鲲鹏智能装备制造有限公司 | The test device of deep-sea movable component |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB833217A (en) * | 1955-02-04 | 1960-04-21 | Aeratom A G | Improvements in or relating to the bottling of pressurized liquids |
| EP1728560A1 (en) * | 2005-06-03 | 2006-12-06 | 3M Innovative Properties Company | System for storing and dispensing of a substance |
| CN104029927A (en) * | 2013-03-05 | 2014-09-10 | 北京红海科技开发有限公司 | Self-measuring container and method for taking out accommodated object in container |
| CN105730891B (en) * | 2016-02-04 | 2024-04-16 | 北京红海科技开发有限公司 | Liquid volume metering tool, container and method |
| CN207478608U (en) * | 2017-11-17 | 2018-06-12 | 北京红海科技开发有限公司 | The initial location system taken for liquid meter |
-
2017
- 2017-11-17 CN CN201711148827.7A patent/CN107899627B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321540A (en) * | 2000-04-30 | 2001-11-14 | 中国石油化工集团公司 | Membrane back-washing equipment of cross-flow type membrane filtration system |
| EP1195518A3 (en) * | 2000-10-04 | 2003-07-02 | Robert Bosch Gmbh | Method and device for dosed pumping |
| CN201991845U (en) * | 2011-03-16 | 2011-09-28 | 东莞市尚正机电科技有限公司 | High-speed heavy-load linear reciprocating-movement body running energy storing device |
| CN202321227U (en) * | 2011-09-28 | 2012-07-11 | 厦门柏润氟材料科技有限公司 | Manual quantitative liquid taking device |
| CN202538805U (en) * | 2012-03-30 | 2012-11-21 | 苏丹 | Reusable quantitative liquid transfer device |
| CN105214748A (en) * | 2015-10-14 | 2016-01-06 | 南京白云化工环境监测有限公司 | A kind of sampler of quantitative liquid getting |
| CN206459818U (en) * | 2016-11-14 | 2017-09-01 | 深圳市鲲鹏智能装备制造有限公司 | The test device of deep-sea movable component |
Non-Patent Citations (1)
| Title |
|---|
| 液控活塞式小流量计的研制;李晓东, 苏学利, 赵仕俊;石油仪器(03);全文 * |
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