Pipe joints or couplings – Having plural independent paths – For concentric tubes or pipes
Patent
1998-07-17
2000-09-05
Nicholson, Eric K.
Pipe joints or couplings
Having plural independent paths
For concentric tubes or pipes
285 47, 285374, 285110, 454 45, F23L 1702, F16L 3900
Patent
active
061131555
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a modular metal duct designed particularly, but not exclusively, for discharging flue gases from boilers.
BACKGROUND OF THE INVENTION
In general, such ducts are known and are built up of elements suitable for being interconnected, each having a reduced-diameter male endpiece at one end, and an enlarged-diameter female endpiece at its other end.
In domestic installations, where combustion gases are to be discharged from a cooker, connection between two adjacent duct elements is generally the result of a friction assembly, with successive elements merely being fitted one within another. It is also known to place collars along the length of pipes assembled together in this way for the purpose of fixing such pipes to an adjacent wall, and such collars can optionally serve to reinforce the connection between two successive elements.
Large-diameter chimneys for industrial installations are generally made either of concrete or of steel, with the steel elements being united via flanges that are welded on in the factory and being transported directly to the site.
For installations of medium size, the present practice is to use modular ducts made up of tubes that are connected together end to end. Sealing means may be provided between two tubes, but unfortunately such sealing is insufficient against condensed flue gases, particularly when the duct is used with a counter slope. In addition, they are unsuitable for being cut to length, for example so that the collars correspond to joints between facing stones.
OBJECTS AND SUMMARY OF THE INVENTION
A first object of the present invention is to improve sealing at the junction between two tubular elements, said elements being easy to disassemble and then reassemble.
A second object of the present invention is to provide a modular duct in which at least one element is capable of being cut to a desired length while nevertheless conserving good sealing characteristics for the assembly.
According to the invention, the interfitting modular metal duct, in particular for a chimney, comprises at least one inner duct made up of interconnected elements each having a male end and a female end that are interfitted in succession, and means for uniting two successive tubular elements, and the female end includes a lip gasket with a fold chamber.
In this way, sealing is guaranteed between two elements by the lip of the gasket mounted in the female endpiece bearing against the outside surface of the male endpiece. After assembly, the lip is pressed against said surface by the pressure that obtains in the fold chamber.
In an embodiment of the invention, the duct comprises an outer duct or envelope surrounding the inner duct and mounted the opposite way round to the inner duct elements, two duct elements (an inner element and an outer element) being assembled together by a gasket stuck at a head end, insulation being inserted between the two ducts.
The invention thus provides two layers of connection, thereby increasing the stiffness of the assembly.
In yet another embodiment of the invention, the duct further comprises a load-carrying modular outer envelope for assembling together two concentric elements, respectively an inner element and an outer element, by surrounding them, the assembly zones of the outer envelope lying, after assembly, in the middle of the other two elements.
This provides a duct that is automatically stable and self-supporting, i.e. its stability is ensured at a single point by being anchored to the ground, thereby avoiding any need for stays or stability-ensuring means.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the present invention appear from the following description of particular embodiments, given purely by way of non-limiting example, and with reference to the accompanying drawings, in which:
FIG. 1 is a view of a duct of the invention;
FIG. 2 is an identical view of a duct in which one of its elements has been cut to length;
FIG. 3 is a view on a larger scale showing the profile of the
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Constructions Metalliques Mecaniques Beirens C.M.M. Beirens, SA
Nicholson Eric K.
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