Untitled record

Process for the preparation of a flowing liquid mixture containing two or more liquids in constant proportion It is frequently the object of the art to supply two or more liquids in a constant proportion to a particular use, whether they are to be mixed or emulsified or wants to react with each other.

The proposals made so far for achieving this object relate to methods or apparatus arrangements in which the constant quantity ratio of the liquid flows is controlled by valves or other devices serving to change the cross-section of the discharge lines. Thus, it has been proposed for this purpose to make the outflow of two different liquids thereby under the same pressure that a stabilized by a counterweight ausbalaniceerter container with the one liquid in the vessel containing the other liquid tv.urde, but also here the adjustment of the constant quantity ratio by stopcocks, the continuous monitoring is required. It has also been proposed to regulate the outflow of a liquid from a container by displacing the liquid from the bale container by means of a float whose weight is increased by a liquid entering it. But even here, the running amount of liquid is given by the adjustment of that valve, by which the amount of auxiliary fluid flowing into the float is regulated, so that here a Überfachung requiring control element is present and also the absolute constancy of the ratio, especially in Schxvankungen in the liquid withdrawal, is not given.

According to another known proposal, the constancy of the mixing ratio should be achieved by taking out the regulated liquid streams of Mariott's bottles. whereby the liquids to be mixed kept constantly under the same overpressure. But here too, the mixing ratio itself is regulated by appropriate adjustment of drain taps.

Finally, it is already known to remove a mixture consisting of several liquids from a device. the individual vessels during the removal of the liquid mixture on the way via the common outflow leading connecting lines communicate with each other. Again, shut-off valves are used as regulator organs which are connected to each other by a rigid adjusting device and serve to regulate the specific ratio of the individual liquid components. An undisturbed outflow of several liquids is apparently only possible in such a device. if the Verbindungsletitungen leading to the outflow are filled only imperfectly with the effluent from the vessels, so that no true communication in the physical sense can develop between the individual vessels. Otherwise, a liquid would pass through the connecting line to the other liquid during the removal of liquid until pressure equalization has been achieved in both containers. Of course, this transfer would completely disturb the achievement of a constant quantitative ratio of the liquids in the discharge line. In the former case, however, the liquids evidently stand during the outflow at a pressure different from each other and also constantly changing. This results from the fact that the rise heights of both liquids during removal in different amounts decrease, since the container at a certain time z. B. is completely empty. while the other container is only half emptied. The difference in the rise heights, however, inevitably results in a corresponding difference in the pressure under which the individual liquid flows, and this difference in pressure in turn results in a difference in the outflow velocity. The proportions of the liquids must therefore during the. Flows are subject to a permanent change, so that it would be necessary to maintain a really constant Mengenverhäluncs always be nachzuregulieren the position of Abflußhäjne the einzclnen vessels accordingly.

It was also known. to suck each of the liquids through a controllable pump and thus to produce a certain proportion or to come to the stated aim by other metering and measuring devices, as they are common in the art.

All of these devices need monitoring for a long time without guaranteeing an absolutely exact ratio.

In particular, difficulties are to be expected if the course of the process, for which the supply or removal of liquid mixtures in constant Megenverhältnis is required, a change in the total time required in the total amount of liquid mixture. Such a regulation always encounters considerable apparatus difficulties in the hitherto known methods and devices for producing liquid mixtures of constant composition due to the necessary conversion of the regulating devices.

It has now been found that one can avoid these disadvantages in a simple manner by that in the preparation of a flowing liquid mixture containing zmei or more liquids in a constant ratio. by removal from a common outflow voiil vessels. which contain the individual liquids and the contents of which are in communication with each other via the connecting lines leading to the outflow, proceeds in the manner that the desired ratio of the components during withdrawal is adjusted solely by appropriate dimensioning of the cross section or the number of vessels or both becomes. wherein the liquids are in each GefäDen from the beginning against each other in the pressure balanced state.

The principle of the invention will be explained with reference to FIG. The cross section of the container A is twice as large as that of the container B. Both containers are at the same spec. Weight of liquids filled to the same height. After opening of the Höhne a and b then no mixture takes place, since the pressure levels of both liquids are the same. After opening the tap c liquid flows from both Behoilterll. The liquid level iii two containers thereby decreases one of the time unit by the same amount. It's easy to see. that at the same time the quantity A was taken from the vessel A, than from the vessel B,> i>. From the faucet c flows at every flow rate cin mixture of exactly constant lenververhälinis, and the retention of this constant Meugenverhältniscs is completely independent of any change in the flow rate of the mixture required by the intended use. The cross sections of the lines and the valves a and b are chosen here. that the resistance in them is low or about the same for both liquids. In any case, these valves are not used to adjust the mixing ratio.

A change in the quantitative ratio can easily be achieved by introducing into the containers displacement bodies which change the cross sections to the required extent. It is also possible to have several containers in parallel, which may have the same or different cross sections. In picture five containers of the same cross section are connected in parallel. By means of the taps # and g, it is possible to remove part of the containers with one liquid, the one remaining with the other liquid, and then remove them from the tap into both liquids in the corresponding constant proportion. By changing the number and cross section of the container you can achieve any desired ratio.

It goes without saying that the method can also be used in the processing of more than two liquids.

Are the spec. Weights of liquids different, this is when filling the container and calculating the ratio without difficulty. to take into account that the container the different spec. Weight of the liquids are accordingly filled up to different riser heights. As a result, the passage of a liquid in the container of another liquid is impossible, and the outflow is the same as in liquids of the same spec. Weight under retention of the constant quantity ratio and independent of the flow velocity.