DE19509580C2 - Double-walled pipe element made of stainless steel for creating double-walled chimneys, flue gas or steam lines - Google Patents

Description

The invention relates to double-walled tubular elements Stainless steel for creating double-walled chimneys, Exhaust or exhaust pipes, with an outer tube and one in this concentric to its longitudinal central axis Inner tube, the ends of the inner and outer tubes Form coupling parts of pipe couplings.

In a tubular element known from EP 0 443 222 A1 this genus is the inner tube by several on its Perimeter spaced, radially extending Spacer bracket with a triangular shape held in the outer tube. The Spacers are supported on one in the outer jacket of the Outer tube molded, inwardly protruding, surrounding bead and are with both of their arms bent tabs welded to the inner tube.

The invention has for its object the bracket of the inner tube in the outer tube in the generic to simplify double-walled tubular element and To avoid spot welding in the area in contact with the exhaust gas, which lead to corrosion.

This object is achieved by a double-walled tubular element with the characteristics of Claim 1.  

The sub-claims contain expedient Refinements of the double-walled tubular element.

The double-walled tubular element according to the invention for Creating double-walled chimneys, flue gas or Steam lines are characterized by a star shape trained spacer and clamping ring for holding the Inner tube in the outer tube, which is a simple Assembly of the tubular element enables and inexpensive in the manufacture is.

An embodiment according to the invention is below with reference to drawings explained. It shows

Fig. 1 is a side view of a double-walled tubular element equipped with a spacer and clamping ring for the inner tube and

Fig. 2 shows a cross-section of the tubular element according to line II-II in FIG. 1.

The double-walled tubular element 1 made of stainless steel according to FIGS. 1 and 2 for creating double-walled chimneys, exhaust gas or steam lines has an outer tube 2 , which is also referred to as an outer shell, and one in the outer tube 2 by means of a spacer and clamping ring 3 concentrically Longitudinal central axis 4-4 of the outer tube 2 held inner tube 5 , which is also referred to as the inner shell. The two tubes 2 , 5 are each expanded at their socket end 6 , 7 to a clear inner diameter which corresponds to the outer diameter at their insertion end 8 , 9 , so that two tube elements 1 , 1 can be plugged together.

The star-shaped, limited elastic spacing and clamping ring 3 made of stainless steel, which is folded from a flat strip to form a pentagonal ring, is with cutouts 10 in the corner area 11 on a molded on the socket end 6 of the outer tube 2 in its outer jacket 12 , inwardly projecting , circumferential bead 13 held positively and spot welded to each ring portions 14 of the inner tube 5 tangent to the outer jacket 15 at its socket end 7 with the outer sheath 15 of the inner tube. 5

By holding the inner tube 5 with the star-shaped spacer and clamping ring 3 , which is spot-welded to the individual ring sections 14 with the socket end 7 of the inner tube 5 , in the outer tube 2 it is ensured that the inner tube 5 of the double-walled tube element 1 during heating by hot exhaust gases and vapors flowing through the inner tube 5 , can expand both in the axial direction and in the circumferential direction.

Reference list

1 pipe element
2 outer tube
3 spacer and clamping ring
4-4 longitudinal central axis of 2
5 inner tube
6 socket ends of 2
7 socket end of 5
8 insertion ends of 2
9 insertion ends of 5
10 detail in 11 of 3
11 corner area of 3
12 outer sheath of 2
13 bead in 12 of 2
14 ring section of 3
15 outer sheath of 5

Claims (3)

1. Double-walled pipe element made of stainless steel for creating double-walled chimneys, flue gas or steam lines, with an outer pipe and an inner pipe held therein concentrically to its longitudinal central axis, the ends of the inner and outer pipes forming coupling parts of pipe couplings, characterized by a star-shaped design , limited elastic spacer and clamping ring ( 3 ) made of stainless steel, which is folded from a flat band to a polygonal ring, with cutouts ( 10 ) in the corner areas ( 11 ) on one at one end ( 6 ) of the outer tube ( 2 ) in its outer jacket ( 12 ) molded, inwardly projecting, circumferential bead ( 13 ) is held in a form-fitting manner and with the individual ring sections ( 14 ), which touch the outer jacket ( 15 ) of the inner tube ( 5 ) at one end ( 7 ), with the outer jacket ( 15 ) is non-positively connected. 2. Pipe element according to claim 1, characterized in that the individual sections ( 14 ) of the clamping ring ( 3 ) with the outer jacket ( 15 ) of the inner tube ( 5 ) are welded, in particular are spot welded. 3. Pipe element according to claim 1 and 2, characterized in that the clamping ring ( 3 ) has a pentagonal shape.