DE7421432U - HEATING ELEMENT FOR HOT WATER BOILER - Google Patents

Description

MERTENS & KEIIL PATENT LAWYERS

G 74 21 243.7 6OOO Frankfurt / Fi, June 6, 1977

K 83 P 44

Austria email Aktiengesellschaft in Vienna

(Austria)

Heating element for domestic water boiler

The innovation concerns a heating element for domestic water boilers, which consists of two nested, a water space including η cylindrical jackets, between which a helix is provided, the protrudes from one of the two sheaths, preferably the inner sheath, and through the other. Coat, which is made of sheet metal consists, covered the water space divided into oinen helically running channel.

In heating elements of this type, it is necessary that the water is completely helical through this Channel flows. This is only possible if there are no leaks exist between the coil and the dumbbells. If there are any crevices, the water will follow the principle of least resistance through this gap and does not participate in the whole helical movement. This naturally has the desired effect of achieving high performance, depending on the size of this loss amount, reduced.

In an effort to achieve this tightness, in a known preheater with an inner tube, the outer surface of which has a double spiral, and

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an ua-ruuei. ^ tiotulytc ~ λ dumbbell be tried the required fit by turning the parts well to obtain.

Another known heating element mix a smooth outer jacket and a continuous, helical, embossed grooves having inner jacket the suggestion has been made to provide short ... weld seams at regular intervals, which bring both dumbbells together so that they fit tightly should.

3EI a further known heating element nested of two shells and an interposed, provided with helical corrugations V / ellrohr-metal cylinder or a Außenraantel and a ^': .i forming from this enclosed helically gewicki Yuen and the inner shell Yierkantproi. I "<, wedge locks are provided to seal the spiral-shaped channels tightly.

However, the known allowances are not in able to produce a completely tight seal, rather small gaps occur through v / cal one The k value deteriorates.

To counter this I-deficiency, a heating element is used proposed of the type mentioned, in which the innovation according to the coil, which of a Pressed-in groove is formed, covering liantel is pressed over this with a tight fit.

Another feature of the innovation is that the outer jacket at its lower end a Has widening, at the start of which a conical surface is provided.

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Further details of the innovation are explained at Jland, the drawing in v / elcher a domestic water boiler is shown with the renewal heating element. Show it

1 shows a longitudinal section of the boiler and FIG. 2 shows section A of FIG. 1 on a larger scale.

1 denotes the xJrauchwasserboiler, in

which the heating element 2 according to the invention is installed, which consists of a smooth outer jacket 5 and an inner jacket 5 provided with a helical groove 4. Through this pressed-in groove 4, the V / 'asserraura between the outer and inner casing 3 or 5 is converted into a helically running channel 6 uiite.ri.eii L, wuiuii; a Zwäiigüötx ^- umüJig u6S WaSScI ¹ B is created, which produces the high k-value of the heating element.

You can now achieve that the water flows completely through this helical channel 6, that's it required that the grooves 4 with their vertices 7 as close as possible to the outer jacket 3 lie.

To achieve an absolutely tight fit of the outer shell '■}, it is darübergepreßt means of a press on the provided with the grooves 4 inner shell and that with such a stern seat, that an absolutely tight fit of the outer shell 5 at the crests 7 of the groove 4 is guaranteed.

The outer jacket 3 ".lat at its lower end a widening 8, whereby a conical surface arises at the point 9, which the pushing of the outer cylinder is made much easier. Furthermore, after pressing on the outer jacket with a

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correspondingly shaped .j chlie. '.', tool on the same press the '' .inbnrrifiln dar both ünaen "i υ and ii made. During this pressing process, the straight ends of the outer jacket are bent inward until they are close to the inner jacket come, with one circular seam 12 or 13, the heating element 2 is then welded tightly at the top and bottom.

Of course, various structural changes can be made as part of the innovation. For example, it is possible to provide the grooves 4 on the outer spiral 3 and to insert the inner jacket 5 under pressure. In this I? Alie and the inner coat with the widening 8 can be provided with abgebördelten land on the outer jacket 'j arigeaohweißt üein. Finally, there is also the ricglichkeit, instead of the groove 4 has a v / endelförin provide ^ gcn use, v / hich at most? -... \ outer or inner sheath, s for example, by Schwfti is fixed.

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Claims (3)

MERTENS & KEIL patent attorneys protection claims 1. Heating element for domestic water boiler, which consists of two nested, enclosing a water space cylindrical dumbbells, between which a helix is provided, which is from one of the two dumbbells, preferably the inner jacket protrudes and the other jacket, which is made of sheet metal, covers the water space in subdivided a helically extending channel, characterized in that the helix which is pressed in by one Groove (4) is formed, covering dumbbell (3) is pressed over this with strict Sit-z. 2. Heating element according to claim 1, characterized., that the Außenmaritel at its lower inde has an upgrade (8), at the beginning point (9) a conical Area is provided. 3. Heating element according to claim 2, characterized in that both ends of the outer casing (3) are crimped and adjacent to the inner jacket (5) with one round seam each (12, 13) are welded on. 7421432 09/08/77