DE8813583U1 - Burner-heated hot water tank - Google Patents

Description

Burner-heated hot water tank

The invention relates to a burner-heated hot water tank with a drain outlet arranged in the floor area and an outlet arranged in the ceiling area for the connection of a circulation line.

The object of the invention is first of all to cool the area of the burner flames of such a directly heated hot water tank of the type described at the beginning by means of an advantageously designed cooling system to such an extent that pollutants occurring in the exhaust gas, the formation of which is caused by thermal factors, such as NO, are at least largely reduced.

Furthermore, it is an aim of the invention to design the cooling of the burner flames in such a hot water storage tank in such a way that the necessary structural measures can be carried out subsequently even in existing storage tanks of this type using a retrofit kit, without having to make any fundamental changes to the basic structure of the storage tank.

Finally, it is also an aim of the invention to use the heat obtained by cooling the burner flames to heat the stored water.

According to the invention, all of these objects are achieved in that a water-carrying line from the outlet arranged in the ceiling area for cooling the burner with a section over the area of the fuel outlet openings of the burner

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to the emptying outlet located in the bottom area of the container*

If the above-mentioned connections are present on the storage tank, this line section can be installed without difficulty and with little effort, whereby the drainage outlet of the floor area can be used as an entrance to the floor area, contrary to its intended purpose.

Insofar as circulation according to the thermosiphon principle does not necessarily occur in this pipe line, a circulation pump can be arranged in this pipe line serving as a circulation line to promote water circulation.

Furthermore, this line may contain a check valve to prevent the entry of storage water via the drain outlet.

In order to avoid heat losses, it is advisable to arrange a valve in the circuit of this pipework that is controlled depending on the burner operation, e.g. the fuel supply valve of the burner, which only enables the circuit for the respective operating time of the burner.

Embodiments of the subject matter of the invention are illustrated in the drawings, where

Fig.l a schematic vertical section through the hot water tank and

Fig.2 shows such a storage tank in the same section as the line section forming a circulation line.

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The storage tank encloses the storage space 2 with its tank wall 1 and is itself surrounded by an insulating jacket 3. In its lower area it encloses the combustion chamber 5 heated by a burner 4, from which the exhaust gas duct 6, which contains a coil 7 that promotes heat exchange, extends and opens into a chimney.

In the area of the ceiling, the wall of the tank is usually traversed by a connection 8 for a circulation line.

Furthermore, the bottom area 15 of the container wall 1 usually has an outlet 9 for emptying the container as required.

According to the invention, the connections 8 and 9 are now used to install a line 12 with a circulation pump 11, which ensures the cooling of the burner area and runs with a section 13 above the fuel outlet openings 14 of this burner 4. In this section 13, the line 12 can branch into any desired group of cooling pipes, which are to be adapted to the type, shape and size of the burner 4.

The line 12 then flows via the connection 9 into the bottom area l5 of the tank, in which, as is known, the comparatively cooler storage water is located, with which the cooling water from the line 12 heated by the burner flames mixes and gradually rises into the upper area of the tank as it becomes increasingly heated.

The burner area of section 13 of the line

The pipe system formed can, within the scope of the invention, consist of several parts and is designed according to the type of burner 4 (rod, can or pot burner) and adapted to the burner output.

According to the embodiment of Fig. 2, the line 12 with the circulation pump 11 and the non-return valve 10 forms a circulation line that leads from the connection 8 via various service water taps 16 and 17. These taps 16, 17 are also connected to a cold water supply line 18, which also supplies the storage tank with cold water via a branch line 19 and the connection 20 on the tank ceiling.

Claims (6)

1 - Burner-heated hot water tank with a drain outlet arranged in the operating area and an outlet arranged in the ceiling area for connecting a circulation line, characterized in that a water-carrying line (12) is led from the outlet (8) arranged in the ceiling area for cooling the burner (4) with a section (13) over the area of the fuel outlet openings (14) of this burner (4) to the drain outlet (9) arranged in the bottom area (15) of the container (I). 2. Hot water storage tank according to claim 1, characterized in that a circulation pump (11) serving to promote the water circulation is arranged in this line (12). 3. Hot water tank according to claim 1 or 2, characterized in that a non-return valve (10) is arranged in this line (12). 4. Hot water storage tank according to one of claims 1 to 3, characterized in that in this line (12) there is arranged a valve which is controlled as a function of the burner operation, e.g. by the fuel supply valve of the burner (4), and which only enables circulation for the operating time of the burner (4). 5. Hot water storage tank according to one of claims 1 to 5, characterized in that the line (12) forms a circulation line which leads via service water taps (16, 17). 6. Hot water storage tank according to claim 5, characterized in that the taps (16, 17) are connected to a cold water supply line (18) which also supplies the storage tank (1) with cold water via a branch line (19).