EP0076486A1 - Apparatus for producing and storing domestic hot water - Google Patents

Abstract

In order to make effective both surfaces of an electric and correspondingly insulated plastic heating mat on a device for heating domestic water and consequently to avoid special measures on the heating mat for the one-sided orientation of the heat transmission to the water in the container and likewise measures for ensuring a perfect contact of the mat band on the outer wall of the container, the device is designed in such a manner that the heating element (1) is arranged in the water-conducting inner space of the container (3) and is formed from an electrically insulated plastic heating mat (2), and that the plane of extent of the plastic heating mat (2) is arranged vertically in the container (3). <IMAGE>

Description

The invention relates to a device for generating and storing hot domestic water according to the preamble of the main claim.

The device previously known from DE-GM 1 9o3 198 is a bathing oven converted to electric heating, in the heating or flue gas shaft of which the electric heating element is arranged suspended.

In addition to this device, separately erectable and electrically heatable memories are known, the electrical heating elements being used in two forms, either in the form of a "immersion heater", ie as a metallic, spiral or helical tube with an internal electrical heating resistor or in the form of an outside broadband-like heating bandage wrapped around the container. The disadvantages of "immersion heaters" are generally known, which is why it has become common to simply wrap heating bandages around the outside of the container, as is the case with the subject of DE-GM 72 19 718.

Such heating mats are known in various forms and types of training. This prior art is represented, for example, by DE-OS 25 33 936 and DE-GM 71 04 174.7 ₀ 21 046, 67 52 874, 71 10 939.

The arrangement of such heating mats on the outside of the storage tank is fundamentally associated with the disadvantage that on the one hand the heat is emitted on two sides, but on the other hand this can only be effective in the direction of the wrapped container wall, which requires that the heating mats on the non-effective side Insulate intensively and, if possible, develop it in such a way that the radiation is at least reduced to the ineffective side. It has also been observed that over time, despite the pre-tensioned arrangement of the heating mats on the container, a no longer ideal system of the heating mat bandage on the container can be set, which leads to the formation of gaps and heat transfer conditions that are no longer optimal.

This disadvantageous situation can also occur from the outset if the installation is not perfect, then leads to overheating and possibly even to the result of burning or scorching of the external heat insulation if it consists, for example, of foam plastic, which is preferably used in such devices.

The invention is accordingly based on the object, using the plastic heating mats known per se, to improve a device of the type mentioned in such a way that both surfaces of the heating mat can be effective, so that special measures for the one-sided orientation of the radiation can be dispensed with and measures as well to ensure that the bandage fits perfectly against the outer wall of the container.

This object is achieved with a device of the type mentioned according to the invention by what is covered in the characterizing part of the main claim. Advantageous further developments result from the subclaims.

In contrast to the bath oven according to the aforementioned DE-GM 1 9o3 198, the arrangement of the mat directly in the water-carrying container interior itself, ie, directly in the medium itself to which the heat is to be transferred, is essential for this solution. It is also important from this point of view that the level of the heating mat is vertical so that no sludge can build up and an optimal circulation can take place. Since such devices are usually equipped anyway with a lid that can be closed with a lid, the heating element, of which, depending on the heating power to be installed, of course, several can be attached one above the other, is connected to the lid, so that one ready-to-install unit. The opening or the closure lid does not even have to be kept extremely large with respect to the container diameter, since the heating mat certainly offers the possibility of being deformed with regard to its actual winding diameter and thus also being able to be introduced through an opening of the container with a smaller diameter.

In the case of, for example, a spiral or star-shaped arrangement of the heating mat, care must be taken that adjacent mat areas are kept at a distance from one another.

Basically, it is possible to simply let one or more mats, weighted down at the lower end if necessary, hang from the lid downwards into the interior of the container.

The device according to the invention is explained in more detail below with reference to the drawing of exemplary embodiments.

• Fig. 1 einen Längsschnitt durch das Gerät;
• Fig. 2 einen Querschnitt durch das Gerät gemäß Fig. 1;
• Fig. 3 einen Querschnitt durch das Gerät gemäß Fig. 1 mit einer anderen Ausführungsform der Kunststoffheizmatte;
• Fig. 3 A eine besondere Form des Halteelementes;
• Fig. 4 einen Längsschnitt durch das Gerät mit besonderer Anordnungsform der Kunststoffheizmatte und
• Fig. 5- 7 Querschnitte durch das Gerät gemäß Fig. 4 mit besonderen Anordnungsformen der Kunststoffheizmatte.

They show schematically

• 1 shows a longitudinal section through the device.
• FIG. 2 shows a cross section through the device according to FIG. 1;
• 3 shows a cross section through the device according to FIG. 1 with another embodiment of the plastic heating mat;
• 3 A shows a special shape of the holding element;
• Fig. 4 shows a longitudinal section through the device with a special arrangement form of the plastic heating mat and
• Fig. 5- 7 cross sections through the device of FIG. 4 with special arrangement forms of the plastic heating mat.

As can be seen from FIGS. 1-3, the plastic mat 2 is simply hung in a spiral or star shape (seen in cross section) from above into the container 3, the power supply lines 6, which are of course electrically insulated from water, themselves being able to serve as holders.

Insofar as the plastic of the heating mat completely enveloping the heating resistor is not dimensionally stable but elastic in the sense of the courses according to FIG. 2, 3 can be preformed permanently, shaping measures are easily possible, for example, by guiding the heating mat over a possibly deformable holder B '(FIG. 3A) or simple spacer 8 "(FIG. 2). Deformability is of course only necessary then , if the outer diameter of the heating element 1 should be larger than the inner diameter of the opening 4 of the container 3. In this case, the container 3 at the inner edge 10 of the opening 4 can also be provided with a funnel 11 opening towards the interior 3 'of the container 3 be, which facilitates the removal of the entire heating element 1 if necessary.

According to FIG. 4, the plastic heating mat 2 "can also be easily arranged in the interior 3 'of the container simply hanging in a flag-like manner from top to bottom, possibly provided with a load weight 12 at the lower end.

Since the plastic heating mats 2 "are anyway provided at their ends with tightly integrated metal current bridges in the plastic, these can be semicircular or circularly curved and thus be shaping for the entire heating mat strip, as can be seen from FIGS. 6, 7.

A reduced-diameter insertion into a possibly smaller opening 7 is also readily possible, since the entire structure expands again after insertion into the housing 3.

As indicated in a highly schematic manner in FIG. 1.3, thermal sensors 9 can also be arranged directly on the heating element 1 or on the holder 8, for example sensors for temperature control, temperature monitors and safety temperature limiters.

As can be seen, special container wall penetrations which are otherwise required are no longer necessary at all, since the entire structure is introduced into the container 3 through the opening 4 which is present anyway.

The heating element or the heating elements 1 together with the thermal sensors and the lid 5 form a container 3 that can be produced completely independently. Unit that is accessible to a problem-free exchange if necessary, without interventions on the outer heat insulation 13 are required or the water must be drained.

The cover 5 can contain the entire required connection rotation with plug connections in an attached housing (not shown), wherein there is still sufficient space to accommodate the supply and return connections 14, 15 on the cover 5. The return pipe 15 leading into the lower floor area can serve as a holder or as part of the holder for the heating element (s) 1.

Claims (9)

1. Device for the production and storage of hot service water, consisting of a, provided with a covered access opening container with flow and return connections and with at least one electric heating element, characterized in that the heating element (1) in the water-carrying interior (3 ') of Container (3) is arranged and formed from an electrically insulated plastic heating mat (2) and that the level plane of the plastic heating mat (2) is arranged vertically in the container (3). 2. Apparatus according to claim 1, characterized in that the plastic heating mat (2) is wound spirally and the winding turns (7) are wound at a distance from each other. 3. Apparatus according to claim 1, characterized in that the plastic heating mat (2 ') extending in a star shape in the container (3) is arranged. 4. Device according to one of claims 1 to 3, characterized in that the support elements are designed as insulated power supplies. 5. Device according to one of claims 1 to 4, characterized in that the plastic heating mat (2) is arranged on a deformable or expandable holder (8 '). 6. Apparatus according to any one of claims 1 to 5, characterized in that the heating element (1) by means of support elements (8) on the container interior upward closing cover (5) is arranged. 7. Apparatus according to claim 1, characterized in that the at least one Kunstszoffheizmatte (2 ") is arranged hanging in a flag-like manner hanging down on the sealing cover (5). 8. Apparatus according to claim 7, characterized in that the plastic heating mat (2 ") is provided at the end remote from the cover with a loading weight (12). 9. Apparatus according to claim 7 and / or B, characterized in that the plastic heating mat (2 ") is semicircular or circularly curved.

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