JP2850914B2 - Airtight liquid mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] A liquid mixing device usable in outer space, which aims to obtain a mixed liquid without the presence of a gas phase and a stirring medium, and has two cylinder containers each having a piston, Each vessel and the connecting pipe are provided so that they can be filled with the liquid to be mixed while discharging gas, and the respective pistons reciprocate synchronously in opposite directions to each other, and the flow rate is increased. It is configured to have adjusting means.

[Conventional technology]

Generally, mixing of liquids is performed using rotational force. For example, a stirring rod is turned by hand, a magnet stirrer is turned by an external magnetic field, a rotary blade is turned by power, and a cylindrical container containing a solution is turned on a roller.

In the methods (1) to (4), the concentration of the solution can be easily adjusted, but since a stirring medium is required, contaminants are mixed in the liquid, and the removal of the medium involves loss of the solution. Is effective only in the presence of gravity, and it is difficult to adjust the solution concentration.

These methods are usually performed in the presence of a gas phase,
In the case of mixing in a zero-gravity space, it is conceivable that a liquid is entangled with the stirring medium in the presence of the gas phase.

[Problems to be solved by the invention]

The present invention aims at obtaining a mixture without the presence of a gas phase and a stirring medium.

[Means for solving the problem]

The object is that two cylinder containers each having a piston communicate with each other through a connecting pipe, and each container and the connecting pipe are provided so as to be able to fill a liquid to be mixed while discharging gas, and The solution can be solved by an airtight liquid mixing device, characterized in that the pistons reciprocate synchronously in mutually opposite directions and have flow rate adjusting means.

(Operation)

FIG. 1 is a diagram illustrating the principle of an airtight liquid mixing apparatus according to the present invention. Containers 3 and 4 having pistons 1 and 2 are cylinders and communicate with each other through a connecting pipe 5. The pipe 5 is provided with a concentration measuring window 6, and the concentration of the liquid in the pipe is measured by an absorptiometer (not shown). I do. Since the pistons 1 and 2 reciprocate synchronously in opposite directions, the liquid in the containers 3 and 4
As they move through, they mix with each other. The concentration of the mixed liquid can be measured by a densitometer. As shown in a later example, the absorbance (y) representing the change in concentration is obtained by taking the time t required to push the piston to a certain constant,
It is represented by a damping curve using the number of reciprocations n of the piston as a variable. It should be noted that as the time t for pushing the piston once is smaller,
That is, as the flow rate increases, the time required for mixing to a predetermined concentration is reduced. In order to increase the flow velocity, in addition to the operating speed, the piston may have a larger cross-sectional area, or may be achieved by reducing the flow diameter of the connecting pipe.

When the predetermined concentration is not reached during mixing, the replenishing liquid can be supplied from the container 11. This container is the same as the two cylinder containers 3 and 4 described above. Further, the mixed solution having reached the predetermined concentration can be transferred to the bellows type receiver 13. These containers are connected to the two containers 3, 4 via automatic valves 7, 8, respectively.
Is linked to the system containing

It should be noted that the same system as described above, as well as the replenishing liquid container and the mixed liquid receiver, are provided so that the gas phase can be discharged when the undiluted liquid or mixed liquid is filled.

〔Example〕

FIG. 3 shows one embodiment of the device of the present invention. The containers 3 and 4 use a 200 μ airtight syringe (manufactured by Hamilton), the connecting pipe 5 is a Teflon (trade name of fluorocarbon resin) tube having an inner diameter of 0.5 mm and a length of 180 mm, and a 30 μ flow cell (art Co., Ltd., absorptiometer AC-5200), and two types of pistons having a diameter of 3.2574 mm and 4.6066 mm were prepared as flow rate adjusting means.
The piston 2 is a driving piston, and the piston 1 is a floating piston. Each container 3, 4 has an automatic valve 7, 8 and a connecting pipe 1, respectively.
It communicates with the replenishing liquid container 11 and the mixed liquid receiver 13 via 2 and 14.

The container 3 is filled with the undiluted solution a in advance, and the undiluted solution b to be mixed is filled into the container 4 and the replenisher container 11. At this time, each of the connecting pipes 5 and 12 is also filled and discharged so that gas does not remain in the container and the connecting pipe. When the piston 2 is driven, the piston 1 moves and the stock solution b mixes with the stock solution a. The concentration of the mixture is measured by an absorptiometer through a window 6. If the concentration does not reach a predetermined concentration, an automatic valve 7 is opened and a piston is opened.
Drive 10 to make undiluted solution b from replenisher tank 11 through connecting pipe 12
Add to Further, the piston 2 is driven to repeat the mixing. In order to increase the mixing speed, the diameter may be reduced by the flow diameter adjusting device 9. However, in this embodiment, pistons having different cross-sectional areas are used, and the reciprocating motion of the pistons is increased. And
The time t required for pushing the driving piston 2 is taken as a certain constant, the number of reciprocations n of the piston is made a variable, and the graph is made with the absorbance y as a function.

The graph shown in FIG. 2 is as follows: y = A · exp (−r · (n−1)) (where y is the absorbance, r is the damping constant, n is the number of reciprocations of the piston, and A is the value when n = 1) Indicates the height of the peak of the amplitude)
2 shows an attenuation curve represented by.

Furthermore, as shown in Table 1, as the cross-sectional area of the piston is larger and the operation of the piston is faster, the damping constant becomes larger, and the number of reciprocating movements of the piston before mixing to a predetermined concentration can be reduced. all right.

After reaching the predetermined concentration, the automatic valve 8 is opened, and the mixture is sent to the bellows-type receiver 13 through the connecting pipe 14. Since the replenishing liquid container 11 and the mixed liquid receiver 13 are set to be evacuable at the time of receiving the liquid, similarly to the containers 3 and 4, the mixed liquid can be obtained by shutting off the gas phase.

[Effect of the Invention] Since the stirring medium is not brought into contact with the solution, there is no danger of contaminants being mixed.

There is no loss of sample when removing the stirring medium after mixing.

Since no gas phase is mixed, a solution free of air bubbles can be prepared even in a zero gravity environment such as the universe.

A predetermined concentration can be accurately obtained with a concentration measuring device.

Faster mixing can be achieved by reducing the flow diameter.

Faster mixing can be achieved by increasing the operating speed of the piston.

Faster mixing can be achieved by increasing the cross-sectional area of the piston.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a graph showing a decay constant of a concentration change with a time of pushing a piston as a variable in the apparatus of the present invention, and FIG. It is explanatory drawing which shows the embodiment of an apparatus. 1,2,10… Piston, 3,4… Cylinder vessel, 5,12,14… Connecting pipe, 6… Concentration measurement window, 7,8… Automatic valve, 9… Flow diameter adjusting device , 11 ... Replenisher tank, 13 ... Mixed liquid receiver.

Continued on the front page (72) Inventor Takaharu Asano 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Fumio Takei 1015 Uedanaka, Nakahara-ku, Nakazaki-ku Kawasaki City, Kanagawa Prefecture Fujitsu Limited (56) References JP-A-51-102252 (JP, A) JP-A-61-159034 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01F 3/08, 5/00 A61M 5 / 00 A61J 3/00

Claims (3)

(57) [Claims] 1. Two cylinder containers each having a piston are communicated with each other via a connecting tube, and each container and the connecting tube are provided so as to be able to fill a liquid to be mixed while discharging gas. An airtight type liquid mixing apparatus, wherein each piston reciprocates synchronously in opposite directions and has flow rate adjusting means. 2. The device according to claim 1, wherein a cylinder container having a piston capable of filling the replenishing liquid while discharging gas into one container is connected via an automatic valve. 3. The apparatus according to claim 1, wherein a bellows-type container capable of filling the mixture with discharging the gas to another container is connected via an automatic valve.