AT395771B - CHIMNEY - Google Patents

Description

AT 395 771B

The invention relates to a chimney, in particular constructed of masonry, which penetrates a roof of a building and is provided with an insert, a gap being provided between the insert and the inner wall of the chimney, which is in the region of the chimney opening through a flange of the insert is completed.

According to the relevant regulations, it is necessary for the operation of a chimney to prove that the temperature of the inner wall in the area of the chimney opening does not fall below the dew point temperature of the exhaust gas. Because of these regulations, the operation of many old chimneys with modern equipment is not permitted. In the case of old chimney bricks without a protective insert, the connection of modern heaters with high efficiencies and correspondingly low exhaust gas temperatures due to water vapor condensation in the cold area above the roof can result in the Schomstein inner wall becoming damp.

From US Pat. No. 610,396 a chimney insert consisting of a plurality of segments which can be telescopically pushed into one another has become known. This insert penetrates the entire chimney from the base of the building to the top of the chimney. The purpose of the application is to protect against exhaust gas leaks from the chimney. The segments consist of iron-metal so that there is no corrosion protection. Another disadvantage is the complicated structure with a rectangular cross section and vertically extending, U-shaped spacers.

In order to make chimneys suitable for operation with modern devices, it has also been proposed to insert stainless steel pipes into the chimney or to eject the chimney. It has also already been proposed to convert the chimneys to ventilated chimneys or to install external insulation on the chimneys. All of these proposals have the disadvantage that they require a very considerable effort.

The aim of the invention is to avoid these disadvantages and to propose a chimney of the type mentioned at the beginning, in which condensate formation is largely avoided even when operated with modern heaters and thus with relatively low temperature exhaust gases and which is distinguished by a particularly simple construction.

According to the invention, this is achieved in that the insert is arranged in a section of the chimney which penetrates the roof and protrudes beyond the roof and consists of a thin stainless round tube of constant or widening diameter, the lower edge of which, if appropriate, into a gap between the inner wall engages the chimney and the insert, essentially L-shaped profiled spacers.

The air gap between the inside wall of the chimney and the outside wall of the insert acts as insulation and prevents the temperature of the inside of the insert from falling below the dew point temperature of the exhaust gas. The stainless material for the round tube can be plastic or aluminum, for example.

The inserts are very easy to manufacture from these materials, and they are characterized by a high degree of corrosion resistance.

In addition to the centering of the insert, the L-shaped spacer very largely prevents gas exchange between the gap determined by the insert and the free interior of the chimney, which further reduces the risk of condensate formation.

With a conical design of the insert and a round inner cross-section of the chimney, the design already provides for extensive sealing of the gap delimited by the insert and the inner wall of the chimney, so that there is only very little gas exchange between the gap and the rest of the chimney. A spacer is then unnecessary. This embodiment also has the advantage that the width of the gap increases towards the cold end of the chimney and thus its insulating effect. In addition, the cross-sectional narrowing of the chimney leads to an increase in the flow velocity of the exhaust gases, as a result of which the exit pulse of the exhaust gas increases. This reduces the risk of disturbances in exhaust gas removal, for example due to wind

The invention will now be explained in more detail with reference to the drawing

Show:

1 shows a cross section through a first embodiment of a chimney according to the invention and

Figure 2 shows a cross section through a further embodiment of a chimney according to the invention.

In the embodiment according to FIG. 1, an insert (4) which has an essentially cylindrical section (5) is arranged in the section (2) of the chimney (3) which penetrates the roof (1) and projects beyond the roof (1) , which has at one end a flange (6) resting on the end face of the chimney (3). The insert (4) is connected to the chimney (3) by screws that pass through its flange (6).

This flange (6) closes a gap (8) remaining between the inner wall (7) of the chimney (3) and the insert (4).

The lower end of the insert (4) is held by a spacer (9) which is essentially formed by a ring (10) provided with a cylindrical extension (11), the insert (4) being separated from the cylindrical extension (11 ) isL

The gap between the inner wall (7) of the chimney (3) and the insert is preferably at least 10 mm. The insert (4) itself can be made of a relatively thin plastic or a -2-

Claims (2)

AT 395 771 B aluminum sheet or another non-rusting material, the wall thickness of the cylindrical portion (5) preferably about Is 2 mm. In the embodiment according to FIG. 2, the insert (4) has a conical section (51) which is provided with a flange (6) at its upper end. The lower end of the conical section (51) lies against the inner wall (7) of the chimney (3). The gap (81) remaining between the conical section (51) of the insert (4) and the inner wall of the chimney (3) widens towards the cold end of the chimney (3). This results in a correspondingly good insulation in the coldest area of the chimney (3) and the narrowing of the chimney cross section leads to an increase in the flow velocity of the exhaust gas, so that the exit pulse increases. PATENT CLAIM, in particular made of masonry, which penetrates a roof of a building and is provided with an insert, a gap being provided between the insert and the inner wall of the chimney, which is closed off in the region of the chimney opening by a flange of the insert, characterized in that that the insert (4) is arranged in a section (2) of the chimney (3) which penetrates the roof (1) and projects beyond the roof (11) and consists of a thin stainless round tube of constant or expanding diameter, the lower edge optionally engages in a gap (8, 81) between the inner wall (7) of the chimney (3) and the insert (4), essentially L-shaped profiled spacer (9). For this 1 sheet drawing -3-