AT513731A1 - boiler - Google Patents

Abstract

The invention relates to a heating boiler. The heating boiler has a burner, a combustion chamber for generating hot gases and a heat exchanger for emitting the heat from the hot gas to water. The heat exchanger is composed of one or more modules in parallel. The combustion chamber is arranged outside the heat exchanger so that the hot gas is formed outside the heat exchanger and that no temperatures in the range of the flame temperatures occur in the area of the heat exchanger. This reduces the calcification and corrosion of the heat exchanger.

Description

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Vaillant Group Austria GmbH PT 5225 AT

boiler

The invention relates to a boiler.

A generic boiler is known from the patent EP 1 989 499 B1. It describes a heat exchanger with one or more composite modules. The assembled modules form a combustion chamber in the upper area. In the lower area there is a common outlet opening. Each module is inexpensively formed by two deep-drawn basic elements. Between the combustion chamber and the common outlet opening, the assembled modules form a plurality of rib-shaped chambers, which have a grooved surface outside the modules for better heat transfer from the hot gas carried inside the modules to the water to be heated.

In operation, the known from the patent EP 1 989 499 B1 heat exchanger in a housing is completely surrounded by the water to be heated. Due to the high temperatures in the area of the combustion chamber, limescale will build up on the outside of the heat exchanger during operation. In addition, there is the risk that in the combustion chamber due to high temperatures, the weld seams will leak due to corrosion. 2.10

It is therefore an object of the invention to improve a generic boiler so that limescale and corrosion of the welds are avoided.

This object is achieved according to the features of claim 1, characterized in that the combustion chamber is arranged outside of the heat exchanger. This has the consequence that the hot gas, which is formed by the combustion in the combustion chamber, is homogenized before entering the heat exchanger, so that no high peak temperatures occur in the heat exchanger. As a result, both the calcification and the corrosion of the welds is reduced.

In a development of the invention, the modules from which the heat exchanger can be modularly assembled have an application area and exit area with respective openings at which the modules are assembled. The combustion chamber is provided at the opening of an end module.

In two embodiments of the invention, the module or modules of aluminum casting or stainless steel sheet. These materials are particularly suitable for heat exchangers either because of the good thermal conductivity or because of the high corrosion resistance.

In one embodiment of the module, a module is formed from at least one deep-drawn sheet metal. As a result, a module can be produced particularly inexpensively.

In a particularly advantageous embodiment, the module is formed from at least one tube section formed by hydroforming. This has the advantage that in this case a hollow body can be produced with only a small number of welds. This is advantageous for the corrosion resistance. 3/10 • · ·····················································

The invention will now be explained in detail with reference to FIG.

FIG. 1 shows in section a heating boiler according to the invention. A heat transfer medium, generally water, is heated in a housing 8. The water to be heated flows in via a return connection 10, is heated by the heat exchanger 3 and flows out via the flow connection 9 in order, for example, to heat a radiator and / or a service or drinking water storage and / or drinking or service water. The heat exchanger 3 is constructed from one or more modules 4 and is similar to a ribbed heater. The modules 4 are designed substantially plate-shaped and have an inlet side in the upper region and an outlet side in the lower region.

FIG. 2 shows a single module 4. The module 4 is essentially a flat hollow body, which is flowed through in the interior of the hot gas during operation. In the upper part of an entrance side 5 is provided, which is open on both sides. In the lower area an exit side 6 is provided, which is also open on both sides. For improved heat transfer from the hot gas in the interior of the module to the heat transfer medium outside the module intersecting grooves in the form of pressed depressions or elevations are provided on the front and back. The module can be made for example of aluminum casting or stainless steel sheet. In cases where the module is made of sheet metal, this may for example be welded together from two deep-drawn sheets and / or comprise a hydroformed formed pipe section.

Return to FIG. 1. The modules 4 are combined to form a heat exchanger 3. On the outlet side of the heat exchanger 3 is connected to an outlet 7 for the exhaust gas. The second open side on the outlet side 6 of the heat exchanger 3 is closed by a cover 12. On the inlet side of the heat exchanger 3 is connected on one side with a combustion chamber 2 and on the other side with a lid 11. The combustion chamber 4/10 ♦ ♦ ···· ································································································ ····· «9 mer 2 is connected directly to a burner or a burner assembly 1. The combustion chamber 2 is thus advantageously outside the heat exchanger 3. This ensures that the modules 4 are not burdened with the high peak temperatures occurring in the combustion chamber 2, whereby limescale deposits are reduced by the water on the outside and corrosion on the inside. 5.10

List of Reference Numerals 1 burner 2 combustion chamber 3 heat exchanger 4 module 5 inlet side 6 outlet side 7 outlet 8 housing 9 flow connection 10 return connection 11 cover inlet side 12 cover outlet side 13 grooves »······ ······························································· ··· · · · · ···· ··· ···

Vaillant Group Austria GmbH PT 5225 AT

1. A boiler comprising a burner, a combustion chamber for generating hot gases and a heat exchanger for delivering the heat from the hot gas to a heat transfer medium, wherein the heat exchanger of one or more modules is assembled in parallel and the hot gas in the interior of the module and the heat transfer medium in Exterior of the module is feasible, characterized in that the combustion chamber is arranged outside of the heat exchanger, that the hot gas is formed outside the heat exchanger and that in the region of the heat exchanger no temperatures in the range of flame temperatures occur. 2. A heating boiler according to claim 1, wherein each module has an inlet region at which the hot gas enters and has an outlet region where the hot gas exits, wherein the modules are joined together at the inlet and outlet regions and wherein the combustion chamber at the inlet region an end module is attached. 3. Heating boiler according to claim 1 or 2, wherein the module consists of cast aluminum. 4. Heating boiler according to claim 1 or 2, wherein the module consists of stainless steel sheet. 10.7

A boiler as claimed in any one of the preceding claims, wherein the Module is composed of several parts and wherein at least one of the parts is formed by a deep-drawn sheet metal. 6. Heating boiler according to one of the preceding claims, wherein the module is in one piece or is assembled from a plurality of parts and wherein at least one of the parts is formed by a hydroformed tube section. 8.10