ELEKTRODENKESSEL FOR STEAM OR HOT WATER PRODUCTION.

The invention concerns one the Dampfoder hot water production serving Elektrodenkessel fastened with partial containers, in which at least an electrode connected with a a.c. mains is arranged, filled with water, those under inserting an electrical insulator arranged above the water level to the container ist.

With boilers of this kind mostly one is the electrode assigned backplate electrode electrically connected with the container present, and between the electrode and the backplate electrode the present, if necessary moving water forms an electrical current path. In the 4s enterprise such boilers was observed that in the water contained substances are carried over forming steam and/or over Wasserspritzer into the range of the insulator and on the surface of the insulator in the form of crystals to settle. It is particularly dangerous, s0 if these deposits too electrically leading layers grows together, the short-circuits causes können.

In addition the deposits attack the ceramic insulator chemically, so that its surface becomes increasingly rougher due to these corrosion, whereby the Entss stand the deposits and thus the danger by short-circuits one favours. Additionally the insulator mechanical loads is subjected, which can lead because of the Sprödheit of the ceramic material to the destruction of the insulator. Consequently the insulator must be frequently replaced, which to unwanted operating interrupts führt.

It is task of the invention to improve a Elektrodenkessel of the kind initially specified in such a way that deposits on the insulator considerably reduced or completely avoided 6s become and the danger of fracture of the insulator eliminated wird.

This task is solved according to invention by the fact that the insulator from an electrically isolating, hollow, a Fig. 1 a Elektrodenkessel according to the water jet principle in the profile, Fig. 2 a profile by an insulator of the Elektro3s denkessels after Fig. 1 and Fig. 3 the detail A of the insulator after Fig. 2.

A water jet electrode boiler points in accordance with Fig. 1 a cylindrical, vertically arranged and container 2 closed at both ends up, which is filled approximately to the half with water 3 and is fastened to its upper end of three electrodes 4, of those in Fig. 1 only one is represented. An upper insulator 6 isolates itself downward the extending electrode 4 electrically from the container 2, likewise a further insulator 7, which falls the electrode 4 additionally against the vertical container wall, in order to prevent for example with earthquakes horizontal excursions of the electrode. By an electric motor 11 propelled, in the water a 3 arranged pump 10 promotes water by means of a central tubing 12 to a blast connection 13 and to a housing following to it 15, which is provided with an overflow pipe 16, back-flowed over the water to the lower part of the container 2. The blast connection 13 exhibits the form of a vertical hexagonal prism. Each second side this prism has arranged nozzles 14, which against the assigned electrode 4 arranged, parallel water jets to form in the center a set from vertical one above the other. In such a way water the hitting each electrode 4 falls on an injector plate 18 consisting attached at the lower electrode end of a punched sheet metal. Between this injector plate and dern water level in the container 2 is arranged a backplate electrode, likewise from a metal sheet provided with vertical drillings exists and electrically leading to the container fastened ist.

The upper insulator 6 is essentially tubular and by means of fastening parts not shown down with the electrode 4 and above with a Durehführungsrohr 8 firmly connected. Ever one of the three conductor 9, which by the cavity of the pipe 8, from this electrically isolates itself, and the insulator 6 extended, connects the electrode 4 with one of the phases of a three-phase source of alternating voltage 19.

Further lsolator 7, which is arranged similarly the insulator 6, is at an end with the wall of the container 2 firmly and at the s with the electrode 4 articulated connected to other end. The container 2 is provided with a ground wire 9 ', so that the water jets between the injector plate 18 and the backplate electrode 5 form the current path for the electrical alternating current. Due to the electrical resistance of the Waslo serstrahlen heats up their water and partly evaporates. Steam escapes over a discharge part and does not arrive too to using not shown. Feed water becomes over a feed part 31 zugeführt.

The Leistungssteuerung of the Elektrodenkessels happens is by means of a vertically mobile rule hood 20 hexagonal in the cross section, which is arranged around the tubing 12 and the blast connection 13 around and exhibits at its upper end a scraper ring 21 sliding over the blast connection 13. For the vertical movement of the Regelhaabe 20 this is connected with a vertical, coaxial rack 23, which stands with a gear wheel in interference, which is propelled over a wave 26 by a gear motor 27 with reversible direction of rotation. The more is lifted the rule hood, the more nozzles 14 by the Abstreif2z ring 21 is überdeekt and the less Wasserstra ¿ EN to have with the assigned electrode 4 connection, so that the quantity of water arriving at the respective backplate electrode 5 is reduced and the steam quantity sinkt.

In accordance with Fig. the insulator consists 2 and 3 6 of an essentially hollowcylindrical supporting body 61 and an electrically isolating, hollow molded article 62 from fluoroplastic, e.g. Polytetrafluoroethylene. The molded article exhibits a Aussenmante162' also over its length distributes arranged ring bulges 63 and a Innenmante162 " as, whereby that supporting body 61 between the coats 62 ' and 62 " extends. At the upper end of the supporting body 61 the two coats are connected by means of a connecting section 62 ' “, which covers the front surface of the supporting body 670,147. The axial length of the molded article 62 and/or its two coats reaches nearly up to the lower end of the supporting body 61. At the lower end the insulator 6 the supporting body is the upper end of the insulator 6 to 61 in a cylindrical pivoting 4 ' of the electrode 4. is in a ringnutförmigen recess 8 ' of the execution pipe 8, whereby at this attachment end of the insulator of the molded articles 62 between the supporting body and the recess 8 ' is firmly gotten jammed. Thereby flowing the plastic in the attachment place is prevented, also at strong mechanical load and high temperature. Thus both a fixed connection between the insulator 6 and its neighbouring construction units is ensured and sufficient electrical isolation. The mechanical connections of the insulator 6 with the execution pipe 8 and with the electrode 4 can be realised for example by means of, a not represented hollow screw coaxial to the insulator 6, by their interior itself the likewise conductor not shown erstreckt.

The electrical conductivity of the water is optimized by adding electrolytes (salts or bases). These as well as other substances contained in the water have the tendency, see in the form of crystals inside the container 2 setting off. As far as the insulators 6 and 7 present above the water level are affected by it, this - wíe bereíts described - can have serious consequences. By the arrangement of the Fluorkunststofformkörpers 62 setting such substances off on the insulators 6 and 7 is prevented, since the plastic surface is so smooth and resistant against chemical attacks that no considerable deposits stattfinden.

The achievement of the Elektrodenkessels can be stopped also in such a way that only hot water is produced. The invention can be applied also to other electrode boiler types; e.g. on such, in those also it spill sheet for the water or in those the electrode and the backplate electrode exhibit the electrode and the backplate electrode per the form of a bowl coaxially into one another and dived in water arranged sind.

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