DE3029202C1

DE3029202C1 - Chimney insert pipe

Info

Publication number: DE3029202C1
Application number: DE19803029202
Authority: DE
Inventors: Hans-Dieter Funk; Bruno Kohl; Günter 7530 Pforzheim Kreder
Original assignee: Witzenmann GmbH
Current assignee: Witzenmann Rohrtechnik GmbH
Priority date: 1980-08-01
Filing date: 1980-08-01
Publication date: 1981-12-03

Description

Der Schnitt in F i g. 2 zeigt deutlich, wie die benachbarten Bandkanten einander überlappen und durch Falzung miteinander verbunden sind. Der Falz verläuft dabei etwa auf demselben Durchmesser wie die Innenkrempen des Wellrohres, und zwar zweckmäßig etwa in der Mitte zwischen zwei Wellen. Ferner zeigt Fig. 2 die Position der Schweißpunkte 3 im Zentrum des Falzes 2. Ihr Abstand untereinander hängt vom Rohrdurchmesser ab und liegt in den meisten Fällen zwischen 1 und 5 cm. Man erhält dadurch eine wirkungsvolle und auf einfache Weise herstellbare Sicherung gegen das Auflösen des Falzes. The section in FIG. 2 clearly shows how the adjacent band edges overlap each other and are connected to each other by folding. The fold runs roughly on the same diameter as the inner rims of the Corrugated pipe, and it is useful approximately in the middle between two waves. Also shows Fig. 2 the position of the welding points 3 in the center of the fold 2. Their distance from one another depends on the pipe diameter and is in most cases between 1 and 5 cm. This gives an effective fuse that is easy to manufacture against dissolving the fold.

Im rechten Teil von F i g. 2 ist eine Alternative für die Positionierung der Schweißpunkte dargestellt. Dabei ist die Überlappung der Bandkanten etwas breiter gewählt, so daß die eine Bandkante seitlich aus dem Falz herausragt und mit diesem herausragenden Teil mit der anderen Bandlage lokal verschweißt werden kann. In the right part of FIG. 2 is an alternative for positioning of the welding points are shown. The overlap of the tape edges is a little wider chosen, so that one band edge protrudes laterally from the fold and with this protruding part can be locally welded to the other tape layer.

Dadurch befinden sich die Schweißpunkte 3' neben dem Falz 2. Die Schweißpunkte sind dadurch von den im Falz auftretenden Biegewechselbeanspruchungen befreit und sie können überdies schwächer ausgeführt werden, da lediglich zwei Bandlagen miteinander zu verbinden sind.As a result, the weld points 3 'are located next to the fold 2. The weld points are thereby freed from the alternating bending stresses occurring in the fold and they can also be made weaker, since only two layers of tape with each other are to be connected.

Selbstverständlich kann der Falz 2 entsprechend dem Wickelverfahren gleichermaßen auch auf einem den Außenkrempen entsprechenden Durchmesser oder aber z. B. Iängs den Wellenflanken verlaufen. Of course, the fold 2 can according to the winding method equally also on a diameter corresponding to the outer rim or else z. B. extend along the wave flanks.

Claims

Claims: 1. Flexible chimney insert pipe, especially for subsequent Installation in chimneys at risk of sooting, consisting of at least one helical thread wrapped, pre-corrugated metal tape, the tape edges of which overlap with one another are folded, characterized in that the overlapping tape edges are additionally connected to one another by local welding points (3) distributed over the circumference are.

2. Chimney insert pipe according to claim 1, characterized in that the welding points (3) are attached from the outside of the pipe.

3. Chimney insert pipe according to claim 1 or 2, characterized in that that the welding points (3) are arranged near the inner rims of the corrugated metal strips (1) are.

4. Chimney insert pipe according to one of the preceding claims, characterized characterized in that the welding points (3) in the fold (2) of the overlapping tape edges are arranged.

5. Chimney insert pipe according to one of the preceding claims, characterized characterized in that the weld points (3) of adjacent folds (2) in the circumferential direction are offset from one another.

6. Chimney insert pipe according to one of the preceding claims, characterized characterized in that the fold (2) is knurled in a known manner.

The invention relates to a flexible chimney liner, in particular for retrofitting in chimneys at risk of sooting, consisting of at least a helically wound, pre-corrugated metal band, the overlapping Tape edges are folded together.

Such flexible chimney insert pipes can be easily Introduce into existing chimneys from above and reliably secure them against Sooting. They are currently mainly used for old fireplaces that have already been severely damaged used to avoid canceling them. At the same time, through this measure, the Chimney draft or the efficiency of the chimney improves and the soot and dirt deposits decreased.

The critical point with the known fireplace insert pipes is Seam connection on the overlapping tape edges. When it comes to transport, but above all When assembling the chimney insert pipes, they are sometimes considerable bending and Subjected to torsional stresses, as a result of which the folds tend to crack open.

Attempts have already been made by additional knurling of the fold to increase the strength of the seam joint. But this measure did not yet have the desired success. Investigations by the applicant showed that with a such knurls the movement in the fold and the resulting cracking cannot be reliably prevented.

Starting from this, the object of the present invention is to to realize the attachment of adjacent tape edges in such a way that one Absolutely solid bond is obtained, which causes the fold to pop open under all conceivable Conditions of use excludes. In addition, the flexibility of the Pipe through experience no impairment of this measure.

This object is achieved according to the invention in that the folded strip edges additionally through local welding spots distributed over the circumference are connected to each other. This results in a particularly stable and durable Connection that can withstand severe and multiple bending of the corrugated pipe. In addition, this type of fastening does not affect the flexibility of the corrugated pipe still forms a source of stress cracks, as is the case with multiple folds is.

Although it is known per se, the layers of multi-walled corrugated pipes with one another to weld. However, these are always continuously revolving, Continuous weld seams, which are primarily required to seal the pipe are.

The welding points can be from the inside as well as from the outside of the pipe are attached, mostly because of the better accessibility the outside of the pipe is selected. When using a resistance welding process the electrical connection is made at opposite points of the overlapping Tape edges. Depending on the wave profile, there are different areas of the wave for the Positioning of the welding points into consideration, i.e. the outer and / or inner rims and / or the flanks, the rims, in particular the inner rims, from manufacturing technology Reasons are particularly useful.

Relative to the axial positioning of the welding points to the overlap area of the strip edges, the welding points near one or the other band edge be arranged. It is particularly useful, however, to use them to be positioned in the center of the fold. The fold can be made before application the welding points are also knurled.

The invention is explained below on the basis of an exemplary embodiment described in more detail; F i g. 1 is a plan view of a chimney liner and F i g. 2 shows an enlarged view of the detail "Z" in FIG. 1.

F i g. 1 shows part of the chimney insert tube, which consists of a corrugated Metal band 1 is wound in a helical manner. The tape 1 is made of corrosion-resistant material Metal, preferably made of chromium-nickel-molybdenum steel. It has one parallel to his Longitudinal corrugation and is wound with such a slope, that the adjacent tape edges each with one to produce a fold 2 overlap of sufficient width. The fold 2 is produced in that the overlapping tape edges when winding the hose and then bent several times be flattened.

Of course, it is also possible to have the chimney insert pipe in multiple layers Manufacture execution.

To the opening that occurs with conventional chimney insert pipes To prevent the fold, the overlapping tape edges are additional connected to one another by local welding points 3 distributed over the circumference. These Welding points 3 are expediently located directly in the interlocking area, they can but instead also be arranged next to it, if by a correspondingly low Belt pitch also an overlap of adjacent belt edges in addition to the rebate area is present.