AT390666B - BOILER FOR LIQUID OR GASEOUS FUELS - Google Patents

Description

No. 390 666

The invention relates to a boiler for liquid or gaseous fuels according to the preamble of claim 1.

Heating boilers of this type according to DE-PS 29 48 905 require the rear arrangement of a flue gas discharge box which, according to the arrangement provided there, is an integral component of the heating boiler and is also included in the boiler rear wall insulation. In the case of boilers with larger dimensions, however, it is desirable to be able to separate the flue gas flue box from the boiler in view of the fact that it can be easily inserted into installation rooms, but this is not readily possible with boilers of the type mentioned at the beginning. It should be taken into account that condensate accumulating in this area in particular must not be allowed to escape to the outside, since the entire connection part would be corroded over the course of time, which not only consists of castings that are insensitive to condensate, but also of sheet steel.

The invention is therefore based on the object to improve a boiler of the type mentioned in such a way that on the one hand the flue gas duct remains condensate-tight in its end region and nevertheless the detachably attached flue gas duct box, which is also made of cast iron, can be easily fitted to and removed from this connection region can be.

It is therefore a matter of removing the releasable seal from the condensate-critical area for the boiler without requiring a large amount of additional space and of being able to assemble or disassemble the flue gas extraction box independently of the rear wall insulation of the boiler.

This object is achieved for a boiler of the type mentioned according to the invention by the features stated in the characterizing part of claim 1. Advantageous further developments result from the subclaims.

In this solution, therefore, only the intermediate ring forms an integral component of the boiler, which always remains on the boiler with a temperature-resistant, elastic seal, does not have a large amount of space there and represents the actual connection part for the flue gas extraction box, which forms a separate component for itself and for connection with is provided with a connection opening edge. The intermediate ring is arranged braced against the housing rear wall of the heating boiler with suitable means, against which the flue gas discharge box is then held appropriately braced. The width of the intermediate ring is no more than the thickness of the rear wall insulation, the flue gas discharge box is advantageously provided with an outer circumferential cover flange, which at the same time serves as a pressing element for the opening edge of the insulation material surrounding the intermediate ring Form bracing element of the flue gas discharge box against the intermediate ring, which will be explained in more detail. For the connection of the flue gas discharge box with its connection opening edge, the intermediate ring is provided on the discharge box side with an opening edge connection groove into which a seal of a known type is inserted. Although not to be expected per se, the condensate escaping there cannot do any damage, since there are no sheet steel parts in this area.

The boiler according to the invention is explained in more detail below with reference to the drawing

They show schematically

Fig. 1 in section the rear part of the boiler of interest here

2 is a view of the boiler in the direction of arrow (A) according to FIG. 1st

As can be seen from FIG. 1, the heating boiler, which is only partially shown, consists of a water-carrying housing (13), in which behind the combustion chamber, not shown here, at least one flue gas duct (7) lined with an internally ribbed cast insert (1) with a flue gas box (3) connected. is arranged behind the rear wall (6)

Between the cast insert (1) and the connection opening edge (2) of the flue gas discharge box (3), the intermediate ring (4) made of cast iron is arranged, which engages in the flue gas discharge channel (7) in a sealed manner with a connection ring web (5). This connecting ring web (5) is braced against the housing rear wall (6) and the cast insert (1) with suitable elements, the gaps between the connecting ring web (5), the cast insert (1) and the sheet steel part or the end (7 ') of the flue gas discharge duct (7) made of sheet steel, temperature-resistant, elastic sealant (11) is introduced. Since this intermediate ring (4) is an integral component of the heating boiler and remains on it even when the flue gas discharge box (3) is removed, this connection area of the intermediate ring is absolutely leak-proof and no condensate can reach the condensate-sensitive steel parts of the heating boiler.

On the outside or on the flue gas discharge box side, the intermediate ring (4) is provided with an opening edge connection groove (9) in which a seal (8) is arranged, against which the connection opening edge (2) of the flue gas discharge box (3) presses when it is attached to the boiler

Both the intermediate ring (4) and the flue gas discharge box are provided with bracing elements (10) either in the form of flange lugs (10 ') or in the form of flange rings (10' '), with the help of which, for example, stud bolts on the rear wall (6) of the housing the intermediate ring (4) remains permanently on the rear wall (6), and on the other hand the flue gas discharge box can be releasably clamped to the rear wall of the housing. As mentioned, the tensioning element (10) on the flue gas discharge box (3) is advantageously designed as a flange ring (10 '), since this can then simultaneously serve as a cover for the opening edge of the insulation material (14) arranged in this area. -2-

Claims (3)

No. 390 666 PATENT CLAIMS 1. Boiler for liquid or gaseous fuels, consisting of a water-bearing housing, in which behind the combustion chamber at least one flue gas duct with an internally ribbed cast insert with connected flue gas box is arranged behind the rear wall of the housing, characterized in that between the casting insert (1 ) and the connection opening edge (2) of the flue gas discharge box (3), an intermediate ring (4) made of cast is arranged, which is sealed with a connection ring web (5), braced against the rear wall (6) of the boiler and the cast insert (1), into the ranch gas discharge duct (7) of the boiler engages and has an outer edge groove (9) provided with a seal (8) on the outside. 2. Boiler according to claim 1, characterized in that the intermediate ring (4) and the flue gas discharge box (3) with bracing elements (10), such as flange lugs (10 '), flange rings (10 ”) or the like, are provided. 3. Boiler according to claim 1 or 2, characterized in that the intermediate ring (4) with its connecting ring web (5) with respect to the end (7 ') of the flue gas discharge duct (7) and the end (1') of the cast insert (1) in the boiler with temperature-resistant, elastic sealing compound (11) and the connecting groove (9) for the flue gas vent box (3) are provided with a seal (12). For this 1 sheet drawing -3-