DE3200474A1 - Electrical flow heater - Google Patents

Abstract

In electrical flow heaters equipped with tubular heaters for liquid media not only is a good, as loss-free as possible heat transfer between the tubular heater and the medium to be heated required but said heat transfer is also required to be as uniform as possible, i.e. that no excessively high surface loadings occur which result in stiff lime encrustations which in turn reduce the service life of the heater or even result in malfunctions in the device concerned. These requirements are fulfilled in the novel flow heater by making the flow tube of the heater from an outer tube and an inner tube of smaller diameter, placing one or more tubular heaters between the walls of these tubes and embedding them in a metal powder, and by compressing this structure into a unit under high pressure, thus highly compacting the metal powder, and by installing this structure as a heating insert in a larger container used to convey the medium to be heated.

Description

Electrical flow heater The invention relates to an electrical heated water heater for liquid media, such as water or the like, in particular a heater with high power consumption, there are water heaters known at one or more electric tubular heating elements on the outer jacket of a flow pipe are soldered through which the medium to be heated flows. This, in itself, simple Construction has the disadvantage that a part of the heat generated by the radiator is radiated outwards and therefore useless. However, this can only be achieved through elaborate Thermal insulation can be reduced to a certain extent.

Other known instantaneous water heaters are characterized in that the tubular heating elements are arranged inside the flow tube, i.e. directly be flowed around by the medium to be heated. This embodiment probably has a very favorable shield transition, but on the other hand shows very high surface loads, which lead to premature calcification of the radiator. Consequences of this are then often deformation of the heating elements, short service life and possibly complete Blockage of the heater due to heavy limescale deposits.

The invention aims to overcome these disadvantages and a Thermal water heater to create the relatively low surface load for the radiator, high is resilient and has only slight calcification, or this calcification problem-free to be removed.

For this purpose, the instantaneous water heater according to the invention has a flow tube consisting of an outer tube and an inner tube with a smaller diameter, between the walls one or more liohrheizkörper are arranged and with means a metal powder are embedded, this structure under high pressure to a Unit pressed and so the metal powder is highly compressed and such a heating insert which in turn forms the lead for the medium in a larger one Container is arranged.

With this new type of instantaneous water heater with a very stable structure high outlet temperatures with relatively low OberClächert pollution reach. Inevitable limescale deposits either come off by themselves, or can be easily removed.

The object of the invention is in one embodiment in Drawing shown. FIG. 1 shows the water heater in a side view FIG. 2 and FIG. 3 show the partial insert of the heater in a longitudinal section in the plane II-II of Figure 3 and in cross section in the plane III-III of Figure 2, and Figure 4 one of the tubular heating elements of the heating insert according to FIG. 2.

The water heater shown in Figure 1 consists of a pot-shaped Container 1 with side inlet nozzle 2, one installed centrally in container 1, tubular heating element 3 with outlet nozzle 4 and a cap 5, Which covers the connection side of the water heater. Container 1 heating insert 3 and cap 5 are by means of a flange connection 6, the ring plate 14 of which with the heating insert is soldered together.

The heating insert 3 consists of two concentrically arranged tubes 7 and 8 of different diameters, one of which is the outer jacket and the other form the inner jacket of the insert. Both tubes 7 and 8 are at their lower ones Ends welded to one another in such a way that they form a roof-shaped lower edge 12. The inner tube 8 protrudes beyond the outer tube 7 and thus forms the one already mentioned There are several outlet nozzles between the outer and inner tubes, for example three tubular tubular bodies 9 bent in the shape of a hairpin, as shown in FIG are. These tubular heating elements 9 are by means of a metal powder 10, for example Copper powder embedded between the tubes. The above structure, consisting of Outer and inner pipe, tubular heating element and metal powder is pressed under high pressure, so that the metal powder 10 is correspondingly highly compressed. The connections 11 of the Tleizkörper 9 are led out upwards and are covered by the cap 5. The overall electrical connection takes place via a cable opening 13 in the cap 5.

A temperature limiter is used to regulate or limit the operating temperature known type, the heat sensor 15 within the cap 5 and directly on the outlet nozzle 4 is attached.

The water heater described is so in the pipe system for the medium to be heated, for example water, built in that the cold medium is supplied via the nozzle 2, then initially via the outer jacket of the pipe 7 heated and finally when passing through the inner tube 8 completely on the Gesinscht final temperature is brought.

In addition, it is added that the invention does not apply to what is shown and described embodiment is limited, but also arbitrarily different can be designed, in particular with regard to the external shapes of the individual parts of the water heater.

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Claims (5)

P A T E N T A N S P R Ü C H E = = = = = = = = = = = = = = = = = = = = = = 1. Electric instantaneous water heater for liquid media, in which the medium flows through a through-flow pipe equipped with tubular heating elements, characterized in that that the flow tube consists of an outer tube (7) and one with a smaller diameter Inner tube (8) is formed and between the walls of these tubes (7und8) one or a plurality of tubular heating elements (9) arranged and embedded by means of a metal powder (10) are, and that this structure (7 to 10) pressed into a unit under high pressure and so the metal powder (10) is highly compressed, and that this structure (7 to 10) as an Ifeiz insert (3) in a larger one serving to guide the medium to be heated Container (1) is installed. 2.) water heater according to claim 1, characterized in that the container (1) is provided with an inlet nozzle (2) and the inner tube (8) of the heating insert (3) forms an outlet connection (4) in its extension. 3.) Water heater according to claims 1 and 2, characterized in that that at the outlet connection (4) a heat sensor (15) or the like. a temperature limiter is arranged. 4.) Water heater according to claims 1 and 2, characterized in that that the tubular heating element (9) are bent into a hairpin shape. 5.) water heater according to claims 1 and 2, characterized in that} that the lower ends of the two tubes (7 and 8) of the insert (3) so with each other are welded so that they have a roof-like lower edge (12)