JPS6227045A - Precision addition device - Google Patents

Abstract

PURPOSE:To control an additive liquid with high accuracy by forming a fine cylindrical dispensing port having an inverted U-shape top end extending toward the outside and providing a buffer chamber forming a cylindrical part expanded into part of an addition cylinder connecting to the fine cylindrical dispensing port. CONSTITUTION:A solenoid 28 instantaneously changes over a selector valve 26 to shut off the supply of pressurized air and to release an air chamber 200 to the atm. via a flexible tube 24 and a pressurizing port 22. As a result, the additive liquid 100 in the addition cylinder 16 is immediately returned back into a hermetic vessel 10 by the reduced pressure in the air chamber 200. The excess additive liquid storing in the top end of the dispensing port 18 is also quickly returned back into the hermetic chamber from the buffer chamber 20 by the reduced pressure in the chamber 200 without dropping into a vessel 38 to be added. The good and precise dispensing and dropping are thus made possible without generating any drop at all which is the major cause for the deterioration in accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application for Business Owners] The present invention relates to a precision addition device, particularly an improved precision addition device capable of precisely dispensing additive liquid in the fields of chemistry, pharmacy, and biochemistry.

[Prior art] Precise addition of chemicals and additives is required in various experiments and production processes in chemical processing facilities, pharmaceutical sciences, biochemistry, etc., and especially when accurately measuring the amount of dispensed material as has been the case in recent years. Precise addition of 1 ffl is required.

Such devices have found widespread use, particularly as reactors for oxidizing agents, reducing agents, etc., pH adjustment devices using caustic soda or hydrochloric acid, and addition of nutrients or growth inhibitors to biological fluids.

In normal cases, such precision addition mostly relies on visual inspection and manual operations by skilled workers, and automatic addition devices using a simple suction device have also been proposed.

[Problems to be Solved by the Invention] However, with such conventional devices, a skilled operator is required for the former, and the metering accuracy is not necessarily sufficient to perform a uniform addition metering action. The problem was that it was not possible.

Further, although the latter automatic metering and addition device allows rough addition, it is impossible to perform precise dispensing action on the lateral base with the current device.

In particular, in the past, various types of addition devices have had a serious problem in that the addition liquid dropped from a glass tube such as a pipette after addition has been completed significantly reduces accuracy, making it impossible to perform precise addition in practice.

[Means for Solving the Problems 1] The present invention has been made in view of the above-mentioned conventional problems, and includes providing an addition cylinder in a closed container filled with an additive liquid, and immersing the lower end of this addition cylinder in the additive liquid. In addition, the thin tube dispensing spout extending outside the addition tube faces the desired addition container or saucer, while pressurized gas is supplied to the addition container and the addition is carried out by the pressure of this pressurized gas. This allows for precise dispensing of liquids.

According to the present invention, the addition tube has a thin tube dispensing port extending outward, and the tip thereof is formed into an inverted U shape, and a buffer chamber communicating with this is further provided, so that pressurized gas is supplied during dispensing and addition. The additive liquid is sent to the air chamber on the top surface of the airtight container, and the additive liquid is pushed out at a predetermined speed. Furthermore, when the additive liquid reaches a predetermined volume, the air is removed to quickly remove the additive liquid from the sweat opening by m cylinders. It is characterized by being pulled back toward the buffer chamber to reliably prevent dripping like in the conventional case.

In the present invention, the buffer chamber provided in the addition cylinder further absorbs vibrations generated when the additive liquid is moved, making it possible to achieve a precise addition action without splashing out the additive liquid.

[Example] Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment in which the amount of addition is detected by changes in the mold to perform a gauging action, and at the same time a stirring action is performed in the container to be added.

The airtight container 10 has a glass beaker shape, and a top lid 14 is airtightly and removably fitted into the upper opening of the container through a gasket 12 to seal the inside.

The sealed container is filled with an additive liquid 100, and an air chamber 2 is provided above the additive liquid 100 in the sealed container 10.
00 is formed.

In the present invention, the addition tube 16 is fixed to the g-closed container 10, and in the embodiment, the addition fl 116 is fixed to the upper lid 14 in an airtight manner. This addition cylinder 16 is preferably made of a glass cylinder, and is fixed to the upper lid 14 via a rubber gasket or the like, although not shown in detail.

The addition cylinder 16 has its lower end 16 inside the closed container 10.
a is immersed in the additive liquid 100, and the additive liquid 100 can be easily communicated with the addition cylinder 16.

Further, the addition tube 16 has a dispensing port 18 extending to one side of the closed container 10. In the embodiment, this dispensing port 18 is provided integrally with the addition tube 16, and the tip of the narrow tube protrudes to the outside. You can face the predetermined container to be dispensed.

Further, the dispensing port 18 is formed in an inverted U-shape as shown in the figure, and the additive liquid 100 can be easily dispensed from its tip.

The addition cylinder 16 is connected to the dispensing port 18 by 3!1! This buffer chamber 20 forms a wide buffer chamber whose diameter is sufficiently enlarged compared to the dispensing chamber 118.

The closed container 10 is further provided with a pressurizing port 22, and in the embodiment, this pressurizing port 22 is made of a glass tube,
Like the addition tube 16, it is airtightly fixed to the upper lid 14.

A solenoid valve 26 is connected to the pressurizing port 22 via a flexible tube 24, and this solenoid valve 26 is activated by the excitation action of a solenoid 28.
and a conduit 3 connected to an external source of pressurized air, not shown.
0 can be electrically connected. Further, the solenoid valve 26
In the preferred embodiment, the flexible duplex 24 or pressurized port 22 can be isolated from an external source of pressurized air and instead opened to the atmosphere by switching a solenoid 28.

The sealed container 10 itself is placed on a scale ffi[32, and the weighed value of this scale 32 is converted into an electrical signal by a mold temperature measuring device 34. This electrical signal is also compared with a predetermined dosing by a dosing setter 36,
The output signal is supplied to the solenoid 28.

In order to receive the additive liquid added from the dispensing port 18,
An additive container 38 is provided near the closed container 310.
3. The additive liquid 100 is added in a predetermined amount to the liquid 300 filled inside.

In the embodiment, the solution 3 inside the container 38 is rotated by a magnet 42 driven by a motor 40.
00 is stirred and the desired stirring effect is achieved in the container 38, for example by the movement of magnetic powder or other material inserted into the solution 300.

The embodiment of the present invention has the above configuration, and its dispensing action will be explained below.

The closed container 10, which has been filled with a predetermined amount of the additive liquid 100, is placed in a weighing device 32, and its initial weight is measured and stored in a gravimeter 34. In this initial state, the pressurizing port 22, that is, the air chamber 200 is connected to the flexible duplex 2.
4 is open to the atmosphere via a solenoid valve 26, and as a result, the liquid level in the addition cylinder 16 matches the liquid level of the additive liquid 100.

Next, the necessary addition 0 is set in advance as an electric signal in the three-stage addition regulator 36, and the preparation of the precision addition device is completed.

On the other hand, after the addition container 38 is filled with a predetermined amount of the solution 300, stirring of the solution 300 is started by the rotation of the motor 40.

After the above preparation process is completed, a start signal is supplied from the addition amount setting device 36 to the solenoid 28, and the solenoid 28 switches the solenoid valve 26 to electromagnetically supply pressurized air from an external pressurized air source. The air is supplied to the air chamber 200 of the closed container 10 through the valve 26, the flexible tube 24, and the pressurizing port 22 as shown by the solid arrow.

This pressurized air gradually increases the pressure in the air chamber 200, and as a result, the liquid level of the additive liquid 100 is pushed down,
The additive liquid 100 is pushed into the addition 116, and the extruded additive liquid 100 is poured out from the dispensing port 18 into the added volume as shown in the figure! It is added in portions towards 838.

At this time, the flexible tube 24 has sufficient flexibility so as not to affect changes in the airtight container 10.

Therefore, the weight measuring device 34 adjusts the reduction of the type seedlings by the amount m of the additive liquid 100 dispensed from the dispensing port 18, and supplies this as an electric signal to the addition m setting 2S36. Addition f? l
The setting device 36 supplies a switching signal to the solenoid 28 when the decrease in the weight n reaches a predetermined addition level, and in the embodiment, the solenoid 28 momentarily switches the switching valve 26 to cut off the supply of pressurized air. At the same time, the air chamber 200 is opened to the atmosphere via the flexible tube 24 and the pressurizing port 22.

As a result, the additive liquid 100 in the additive cylinder 16 is transferred to the air chamber 200.
The excess additive liquid accumulated at the tip of the dispensing port 18 is immediately drawn back into the closed container 10 by the reduced pressure of the container 38.
It is rapidly drawn back from the buffer chamber 20 toward the closed container 10 by the reduced pressure in the air chamber 200 without dripping.

Therefore, according to the present invention, after a predetermined amount has been added, it is possible to perform good and precise dispensing without causing any dripping, which is the main cause of deterioration of accuracy.

During the dispensing, the buffer chamber 20 contains the additive liquid 100.
It is clear that this absorbs the vibrations of the liquid, reliably prevents the addition liquid from protruding from the dispensing port 18, and is useful for the precise addition described above.

In the embodiment, during the addition operation, the solution 300 in the addition container 38 is stirred by a stirrer, so that a sufficient reaction action can be promoted.

Through the series of steps described above, a predetermined addition amount preset in the addition a setting device 36 is precisely dispensed and added, and although not shown, a well-known continuous feeding device is used to sequentially feed different containers 38 to be added. It is also possible to automatically dispense and add a desired fixed amount to a plurality of containers to be added by moving the dosing position to the dispensing position of
6 is capable of updating the set addition amount for each dispensed addition and constantly comparing the electric signal from the weight measurement temperature 34 with the new setting m, even if the addition liquid 100 decreases. , which allows for a constant additive action at all times.

In the embodiments described above, air is used to pressurize the additive liquid 100, but in the present invention, any other gas that does not react with the additive liquid, such as nitrogen gas, can be used instead of air. It is also possible to do so.

Furthermore, in the above-mentioned examples, the amount added is determined by the change in weight of the sealed container, but in the present invention,
For example, it is also possible to detect the boehm or concentration in the container 38 to be added and control the addition action based on the detected signal.

[Effects of the Invention] As explained above, according to the present invention, it is possible to control the additive liquid to extremely high purity according to a predetermined m or the necessary addition m, and it is applicable to various chemistry, pharmaceutical sciences, Alternatively, it can be widely used for biochemical dispensing actions.
Moreover, it becomes possible to automate these dispensing additions.

[Brief explanation of the drawing]

The figure is a schematic diagram showing a preferred embodiment of the precision addition device according to the present invention. 10... Airtight container 16... Addition tube 18... Dispensing port 20... Buffer chamber 22... Pressurizing port 100... Additive liquid 200... Air chamber.

Claims (1)

[Claims] (1) An airtight container that can be filled with an additive liquid; an addition cylinder that is fixed to the airtight container; its lower end is immersed in the additive liquid; and its upper end extends upwardly from the airtight container; and an additive tube formed above the additive liquid in the airtight container. and a pressurizing port for supplying pressurized air to the air chamber to be filled, and the addition cylinder has an outwardly extending tip forming a narrow cylinder dispensing port with an inverted U shape, and is connected to the narrow cylinder dispensing port. At least a part of the addition cylinder is provided with a buffer chamber forming an expanded cylinder part, and a predetermined amount of the additive liquid is extruded and dispensed by pressurized gas supplied from the pressurization port to the air chamber of the closed container. A precision addition device characterized in that by removing the pressurized gas, the additive liquid accumulated in the narrow tube dispensing port is drawn back to the addition tube.