DE510055C - Device for adding small amounts of make-up fluids to a main fluid, e.g. a reagent solution to water for water purification - Google Patents

Description

R 73135

In the known devices for mixing a main liquid (tap water) with very small amounts of an additional liquid (reagent), according to FIG. 1 Enclosed drawing a water knife motor ι in the main water pressure line 2 switched on.

When the water flows through

the water-knife motor is given a certain amount of rotating power through it.

which can be used to drive a small reagent pump 3.

By means of this reagent pump 3, it is then possible to pull from an open reagent container 4 Aspirate reagent and then feed this reagent behind the water knife motor into the water pressure line 2 " push in the small reagent pump.

However, these known devices have the following disadvantage:

With a mixing ratio of 1: 1000 up to ι: 5000 becomes especially with small consumption water quantities the reagent pump so small that it is no longer able to handle extremely small amounts of additional liquid to press into the water pressure line, which is under several atmospheres.

Experience has shown the following on the basis of the following example:
A water knife motor for a maximum output of 3 cbm per hour generally requires a water pressure drop of 10 m water column.

With such a pressure drop, of course, the action of the water knife motor is extremely powerful. ^{However, if such a water knife motor delivers only 1} I ₂ cbm per hour instead of 3 cbm per hour in the same time unit, the pressure loss and thus the driving force of the water knife motor decrease significantly, according to experiments in this example from 10 m water column to 1 m water column .

With such low pressure losses, however, there may be minor frictional disturbances in the reagent pump help to barely move the water knife motor or to bring it to a standstill in spite of the Water flow. The water would therefore be significantly reduced or none at all Received additional fluid because the water knife motor no longer receives as much power, to drive the reagent pump so vigorously that the same amount of reagent from the open Sucks in container and into the pressure line of z. B. 4 to 6 atm. Presses in counter pressure. In addition, the small ■ reagent pump must deliver reagents which are applied to the material the pump can have a corrosive effect and also otherwise carry impurities with it.

To all these difficulties and irregularities of an evenly proportional Mixing the additional liquid to the main liquid means to fix at the same time to make the action of the small reagent pump as sensitive as possible while doing this

but also the material of the small pump. In no way to be influenced by the reagent, the device for which a patent has been applied has the following arrangement:
In Fig. 2 of the accompanying drawing, 1 denotes the water knife motor with the associated reagent pump 2, 3 and 3 ° the main water pressure line in which the water knife motor is installed, 4 the reagent container, 5 a connection line from the pressure line to the reagent pump, 6 a connection line for the reagent pump with the upper part of the reagent container, 7 a dip tube from the reagent container to the water pressure line.

The arrangement according to the present invention uses what is known per se, a closed one Reagent container. The essential feature of the arrangement according to the invention is that through the connecting lines' 6 and: 7 both the small reagent pump and the reagent container 4 are under the hydrostatic pressure of the water line 3 ", namely under the same, which at the points where the lines 5 and 7 converge into the pressurized water line 2 prevails. This arrangement increases the work efficiency of the small pump reduced to a minimum by eliminating the need to aspirate reagent and into a water pipe of several atmospheres pressure, but the reagent pump has now only to make a shift in the amount of liquid, namely a shift, which occurs almost without measurable pressure differences. Because in the Reagent pump, in the reagent container and the associated connecting lines of the If the same hydrostatic pressure acts, the small reagent pump only has a liquid displacement to cause in the sense that they through the connecting line 5 water sucked in and through the connecting lines! device 6 in the upper part of the reagent container conveyed into it, creating a corresponding volume of the somewhat heavier reagent solution introduced from the container 4 by means of the immersion pipe 7 into the pressurized water line will.

Because the reagent pump is completely under the same hydrostatic pressure the water pipe is in place, stuffing boxes and piston seals are no longer necessary. The slightest water measurement or work done by the water knife motor can can therefore be transferred smoothly to the reagent pump and thereby becomes even the safe, constant, proportional mixing of the water with the reagent guaranteed for any amount of water flowing through.

Furthermore, since the reagent pump no longer draws in reagent, but only clear Tap water, the latter being used to draw the reagent solution out of its container to displace, the pump is also not a change in material or contamination exposed by the reagent.

These are all tremendous advantages in relatively small mixing devices Amount of water and small mixing ratios, such as ζ. Β. ι: 1000 to 1: 5000.

Claims (1)

Claim:
Device for feeding smaller Amounts of additional liquids for a main liquid, e.g. a reagent solution for water for water purification, consisting of a water column motor and one driven by it Pump for the reagent solution, characterized in that the reagent pump (2) and the associated closed reagent container (4) through connecting lines (5, 6 and 7) are placed under the same pressure as the pressurized water pipe. For this purpose ι sheet of drawings