DE2208950A1 - Electrolyte cell for the sterilization of drinking water and water for swimming pools - Google Patents

Description

Patent attorneys
Dipl.-Chem. I. SCHULZE es Heidelberg ι

Gaisbergstrasse 3 Dipl.-Ing. E. GUTSCHER telephone 232 69

Abs. Dipl.-Chem. I. Schulze, Dipl.-Ing. E. Gutscher, Patentanwälte 1 OUR REFERENCE: 2J72 Heidelberg, Gaisbergstrasse 3 _{| HR ZE} , _CHEN .

Applicant: Piltro S.A., 5, route de Che ^ ne, 1207 Geneva, Switzerland

Slectrolyte cell for the sterilization of drinking water and water for swimming pools.

The invention relates to an electrolyte cell for sterilization of drinking water and water for swimming pools in one Housing two essentially round, nested electrodes are used, between which a passage for the water to be sterilized is free. >

In a known method for sterilizing drinking water and water for swimming pools, slightly salty water is used between the electrodes of an electrolytic cell to remove chlorine and other oxidation products, in particular Ozone, release that special disinfectant properties exhibit.

Due to the released chlorine, the aggressiveness of the ElektroLytes are large and extend the life of the electrodes

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extend, these are often made of precious metals, preferably platinum, or at least made of a coating Precious metals protected.

Because of the high price of electrodes made of precious metal or even just platinum-coated electrodes, it is important to that small electrodes are used. For this reason, two concentric ring electrodes are expediently grounded used, between which the water is led and passed through.

In these known cells, the water circulates axially between the two electrodes and also relatively slowly if only a small amount of hard water is treated, limescale will quickly deposit on the electrodes and reduce their effectiveness and the life of the cell.

The object of the invention is to provide a cell with concentrically arranged To create electrodes in which the formation of solid deposits on the electrodes is reduced and the Cell life is increased.

This object is achieved by an electrolytic cell of the type mentioned, which is characterized in that one or several guides are provided for the water flow, which communicate a spiral swirl to this and which with the passage are connected.

In a preferred embodiment of the invention Electrolyte cell, this guide consists of obliquely arranged pipe stubs, which are upstream at the end of the annular passage are used, which is left free between the two electrodes and has no obstacles.

In another embodiment, the leadership can also be through one or more spiral threads in the passage between the electrical

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to be educated. Such a spiral thread can be, for example, a spiral band that is detachable between the two electrodes is used.

The invention is based on the drawings, in which an embodiment is shown, explained in more detail.

Show it:

Fig. 1 is an axial section in which the middle stuok of the cell
omitted and thus the cell is shown in abbreviated form;

Fig. 2 is a reduced plan view of one arranged in the cell Plate; Lind

2 shows an enlarged assembly of an electrode piece

The cell consists of an outer jacket or housing 1, which
see composed of a tubular central body 1 and two identical end parts 2. These two end parts are provided with axially arranged tubes (not shown),
mi-; to which the cell is connected and which form the water inlet and outlet.

Between the central body 1 and the end parts 2, two identically designed support plates 5 are inserted, which support a central core 4. Each of these platen is with five openings 5 provided for the passage of water.

At each of its ends, the core 4 has a tip 6 which is inserted into centrally arranged holes in the support plates 3 are. It is surrounded by an annular inner electrode 7, which consists of a thin platinum foil, which tightly fits the core encloses.

The inner surface of the central body 1 is covered with a thin platinum foil, which forms the annular outer electrode 8 and concentrically surrounds the inner electrode 7.

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A distance is provided between the two electrodes 7 and 8, so that here an annular passage 9 for the to be sterilized Water is formed, which flows through the cell.

On an outside of each support plate 3 is one Terminal 11 arranged. A stuffing box 12 serves as a seal between the support plate and a platinum conductor Ij5 or which passes through one of the openings 5 in the support plate and is welded to the end of the electrode assigned to it is .. In this way the electrodes are opposite by their Ends fed so that the uniformity of the electric field is ensured, eliminating any Limescale deposits due to local overheating can be avoided. This measure enables better utilization of the metal of the electrode.

As can be seen from FIG. 3, the platinum conductor Ij5 is welded to the inner electrode 7 *, specifically to its lower end. The platinum foil is reinforced at this point by an outer sleeve Ja , which is also made of platinum. The conductor 14 is welded to the opposite end of the outer electrode 8 with the interposition of a reinforcing sleeve 8a (FIG. 1).

The central body 1 and the end parts 2 consist, for example, of glass, while the support plates 3 are made of plastic could be. Each support plate 3 is between the ends of the central body 1 and the corresponding adjacent one End part 2 clamped very tightly. The clamping device consists of two collar flanges 15, which are connected to one another by clamping anchors or tie rods 16 are connected.

The five openings 5 in the support plates 3 are uniform and angled about the axis A-A of the cell. The axes B-B of these continuous through the thickness of the platen openings are ir. 1-

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-D-

planes inclined at an angle of about JO in such a way that they form pipe sockets or guide passages which give the water in the passage 9 delimited by the electrodes 7 and 8 a spiral twist. The spiral flow of the water caused by this is shown schematically by the lines 17 (FIG. 1).

The rotation of the water flow in the passage has the following advantages:

a) Over the main part of the cell length, the water retains the greatest speed obtained in the pipe socket of the openings 5 with and thereby a better whirling and a more uniform sterilization is achieved.

o) Under the effect of centrifugal force, the solids become ground kept away from the inner electrode 7, so that this electrode with the smallest surface and the higher current density is relatively protected in this way. o) Due to the greater speed which the water in the Cell can be lent, if this remains in the treatment channel for a very short period of time, becomes the largest Part of the contaminants and debris are taken out of the cell.

d) The rotating movement of the water also contributes to better decanting of the heavy ones due to the so-called cyclone effect Particles at.

On the other hand, in the cell according to the invention

e) a uniform electric field is generated because the electrodes To feed their opposite ends, whereby the electric field is built up almost only between the directly opposite surfaces of the electrodes. Of the Hüe ^ eri dor outer electrode 8, which is on the inner surface of the middle

to! body 1 and the inner surface of the inner electrode 7 » <lUi rests against the core h are no tightly sealed that practical, coine deposits or any signs of corrosion occur.

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f) The two electrodes resting on surfaces, which have no guiding tasks whatsoever, can be made very thin, so that they can be made entirely of precious metal without their cost becoming too high.

g) The assembly of the various housing parts by means of independent External flanges and stuffing boxes simplify the glass parts.

In a modified embodiment (not shown), the inclined pipe sockets of the openings 5 can be conical or extended by nozzles v / ground, increasing the flow rate of the water and its rotation is accelerated even further.

Other guide means for the water can also be provided, in particular one or more spiral turns (not shown) in the passage limited by the electrodes. Such a guide can, for example, by a be formed in the passage inserted spiral band, which optionally has a diagonal stiffener between the two electrodes forms.

In another embodiment, the end parts 2, the carrier plates 3 and the central body 1 can also be through only two Flanges are held together, clamped against the end pieces and connected to one another by tension or tension anchors which extend the entire length of the sterilizer.

The electrodes can also be made of other stainless metals. In particular, the inner electrode can also consist of a carbon rod.

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Claims (10)

P_a tent claims c_h_e 1. Electrolyte cell for sterilizing drinking water or water for swimming pools, essentially two in one housing round, nested electrodes are used, between which there is a passage for the water to be sterilized free is, characterized in that one or several guides are provided for the water flow, which communicate this a spiral twist and which with the passage (9) are connected. 2. Electrolytic cell according to claim 1, characterized in that at least one opening (5) for the spiral guidance of the water at the upstream end of the passage (9) is arranged with an adjoining inclined pipe socket. 3. electrolytic cell according to claim 1, characterized in that a spiral passage arranged in the passage (9) is arranged for the spiral guidance of the water. 4. Elektrolytzel'le according to claim 1, the housing of which consists of a central body and there are two end parts on which the pipe sockets for the water inlet and outlet are arranged, thereby characterized in that between the central body (1) and the respective End parts (2) support plates (j5) with openings (5) are used for the passage of water and as a support for serve a central core (4) on which the inner electrode (7) is arranged. 5. electrolytic cell according to claims 1 and 4, characterized in that that on an outer area of the support plates (J) Terminals (11) are arranged, which are connected to the inner and outer electrode 3 (7 and 8) via conductors guided through stuffing boxes (12) (13 and 14) are connected. 2098 3 8/0734 6. Electrolyte cell according to claims 1 to 3 *, characterized in that the openings (5) in the support plates (3) for the passage of water are formed in at least one of the support plates in the form of inclined pipe sockets. 7. electrolytic cell according to claims 1 and 4, characterized in that that the end parts (2) are pressed against the support plates (j5), one of which is between an end part and the central body (1) is clamped and held in place by tension or tension anchors (16) which are located between two at the end part (2) and the central body (1) or flanges (15) resting against the two end parts (2) are arranged. 8. electrolytic cell according to claim 4, characterized in that the electrodes consist of a thin noble metal foil, the inner electrode (7) around the circumference of the central core (4) and the outer electrode (8) is placed on the inner surface of the tubular central body (1). 9. Electrolyte electrode according to claims 4 to 8, characterized in that that to achieve a uniform electric field the electrodes at their opposite ends connected and powered. 10. Electrolytic cell according to claims 1 and 2, characterized in that that the spiral guide for the water has a reinforcement inserted between the two electrodes and a spacer forms. 209838/0734