DE1195928B - Metal pipe chimney - Google Patents

Description

Metal pipe chimney The invention relates to a metal pipe chimney with two the central smoke pipe in the area of the attic of a building is concentric surrounding casing pipes, the between the two casing pipes and the inner Jacket pipe and smoke pipe formed spaces near the lower end of the jacket pipes are in communication, so that between the jacket pipes downward flowing air after Deflection at the connection point by 180 °, heated by the exhaust gases in the Smoke pipe, between the latter and the inner jacket pipe flows upwards.

It is known to use metal flue pipes, as this opposite masonry or made of ceramic materials has a low level have effective heat capacity and when using one or more jacket pipes for guiding cooling air when the furnace is started up and low heating are thermally insulated and do not tend to form condensation while increasing Temperature, especially in the case of a strong fire, can be cooled effectively and quickly, so that the necessary fire safety is given.

In a known metal pipe flue that described at the beginning Art, the smoke pipe is kept shorter than the inner jacket pipe, which is on his upper end opens into a chimney head. This training of the chimney leads to the fact that at overpressure in the jacket pipe above the smoke pipe, in particular in certain weather conditions or when the chimney head is exposed to sunlight or less favorable Wind direction, the flue gas emerging from the flue pipe with the cooling air in the Rinauen between jacket pipe and smoke pipe and against the operating direction enters the cooling air system. As a result, the cooling effect no longer occurs in the provided manner.

The invention is based on the object of this in the known Metal pipe chimney to eliminate the disadvantage that occurs and the chimney so too improve that with security penetration of the smoke gases into the cooling air system is prevented.

The solution to the above problem is according to the invention in the Metal pipe chimney described above in that the upper mouth of the inner Jacket pipe is approximately at the level of the upper mouth of the smoke pipe.

The upper mouth of the smoke pipe can, for example, be a little deeper lie than that of the inner jacket tube, without the mode of action being disadvantageous being affected.

According to a further feature of the invention, the deflection zone is located between the jacket pipes in the area of the ceiling that closes off the top floor at the bottom and is the outer jacket tube in the deflection zone of one preferably made of aluminum existing, below closed envelope surrounded.

This achieves a particularly favorable cooling effect in the range of the attic and thus increases the fire safety of the chimney.

It is useful if between the jacket pipes and if necessary between these and the smoke pipe spacers, preferably in the form of adjustable Baffles, are arranged, as this gives a stable and simple design receives which with the arrangement of adjustable baffles still an adjustment of the cooling air flow allows.

An exemplary embodiment of the invention is shown schematically in the drawing reproduced.

The smoke pipe 2 leads through the top floor 1 of a building above, which is concentric of two jacket tubes, the inner jacket tube 3 and the outer jacket tube 4, is surrounded. In the top floor 1 at the bottom Floor ceiling 7 is the chimney by means of a downward through a ring plate 5 closed casing 8 made of aluminum, which is also an additional Brings about thermal insulation. In. the casing 8 is located in the lower area the deflection zone 6 for the cooling air.

During operation, the smoke or the exhaust gas flows upwards in the direction of the arrows 9 in the smoke pipe 2, which gives off heat to the air in the annular space between the smoke pipe 2 and the inner jacket pipe 3. As a result, this air rises in the direction of the arrows 10 . As a result, air is sucked in from the annular space between the inner and outer jacket pipe, which thus flows downwards in the direction of the arrows 11 and in the area of the deflection zone 6 passes under a change of direction of 180 ° into the inner annular space and is heated in this in the manner described above and flows upwards. The cooling air emerges from the inner annular space at the upper mouth 12 of the inner jacket tube 3, which is approximately at the level of the upper mouth of the smoke tube 2. The entry of the cooling air takes place at the upper opening 13 of the outer jacket tube 4, which is covered by a protective structure 14 in this area.

To prevent the smoke pipe from being destroyed by acid or acid vapors will prevent the same from corrosion-resistant material, such as rust-free alloyed or enamelled steel.

Claims (3)

Claims: 1. Metal pipe chimney with two the central smoke pipe in the area of the attic of a building concentrically surrounding casing pipes, the between the two casing pipes and the inner casing pipe and smoke pipe spaces formed near the lower end of the casing pipes are in communication, so that between the jacket pipes downward flowing air after deflection at the connection point by 180 °, heated by the exhaust gases in the smoke pipe, between the latter and the inner jacket pipe flows upwards that the upper mouth (12) of the inner jacket tube (3) approximately at the height of the upper mouth of the smoke pipe (2) is. 2. Chimney according to claim 1, characterized in that the deflection zone (6) is in the region of the top floor (1) at the bottom closing floor (7) and that the outer jacket tube (4) in the deflection zone (6) by one, preferably made of aluminum, closed at the bottom casing (8) is surrounded. 3. Chimney according to claim 1 or 2, characterized in that spacers, preferably in the form of adjustable baffles, are arranged between the casing pipes (3 and 4) and optionally between these and the smoke pipe (2). Considered publications: Swiss Patent Specifications No. 167 735, 217 413; USA: Patent Nos. 236141, 1337746, 2713301.