DE9005677U1 - Wall duct fitting for connecting a plastic gas supply line to a metal house pipe - Google Patents

Description

Metalworks Gebr. Seppe Lfricke GrabK S Co., Gelsenkirchen

nauer feedthrough fitting for connecting a plastic gas supply line to a metal house line

5 Description

The invention relates to a chewing device for connecting a through a chewing device

3 Plastic gas supply line to a: Metal house line- "o-

? with a pipe body that can be screwed to the metal pipe

%. 10 ^ ^as plugged in; ; jns^^toff rahi i.-nde sealed and against

^ Pull outfi^n inserted" ⁿ t takes up and whereby a the

i plastic ear over a noise-absorbing layer

I metallic protective tube OL~r a screw connection to the

&Iacgr; Pohr body is connected.

I 15 A wall duct fitting of the aforementioned type is known, for example, from DE-GM 86 06 166. In this

-I Wall duct fitting is used to connect

,< Plastic pipe and pipe body in such a way, d&3 by means of

a union nut that can be screwed onto the pipe body from the plastic pipe, a clamping sleeve that is pushed onto the plastic pipe end that is inserted into the pipe body, is pressed into the pipe body in order to radially clamp the plastic pipe end with the clamping sleeve in the pipe body in a gas-tight manner and to clamp it against being pulled out. At the same time, the union nut holds the protective pipe on a collar on the outside, over which the union nut presses against the clamping sleeve. The clamping sleeve has a closed peripheral wall and is made of metal, so that a gas-tight metallic contact that meets the safety requirements remains between the clamping sleeve and the pipe body and between the clamping sleeve and the collar of the protective pipe when the plastic pipe is pulled out of the pipe by mechanical force.

^410 should be torn out of the pipe body or in case

38.05.90

of a building fire due to the heat from the Rohi&mdash; body.

Wall duct fittings of the aforementioned known type are complex to manufacture and assemble. For example, in order to be able to slide the union nut onto the protective pipe behind its collar, the protective pipe must be made in two parts with a separate nozzle end containing the collar, onto which the union nut is first pushed and which must then be tightly and firmly connected to the rest of the protective pipe, for example by welding or soldering. Above all, however, the known wall duct fittings are increasingly being rejected by gas supply companies because of the clamping sleeve and the sealing and fastening of the plastic pipe end in the pipe body, which only takes place by means of a clamping effect. The invention therefore has the object of creating a wall duct fitting that avoids the clamping sleeve connection criticized in practice and is also easier to manufacture and assemble and also meets the safety requirements for gas tightness, particularly in the event of a building fire. The wall duct fitting according to the invention that solves this problem is characterized in that the protective pipe, which has an external thread at one end, is screwed into the pipe body, which has an internal thread, until there is metallic contact between an axial sealing surface of the protective pipe and an axial counter surface of the pipe body, and that the plastic pipe end is tightly and firmly welded into a plastic bushing and this plastic bushing is inserted into the protective pipe end screwed to the pipe body between an inner axial stop shoulder of the protective pipe and an axial inner wall. surface of the pipe body, whereby between the inner surface of the pipe body and the front surface of the plastic bushing facing it and between the opposite

lying cylinder surfaces of the protective tube and plastic bushing sealing rings are arranged.

An embodiment of this inventive manifold fitting is shown in the drawing in longitudinal section. The fitting contains a metal pipe body 1, which serves as a screw connection for connecting a plastic pipe 2 used as a gas supply line to a metal pipe (not shown in detail) that continues as a house line, and a metal protective pipe 3, which encases the plastic pipe 2 in a fire-protected manner over a predetermined length, for example at least corresponding to the thickness of a building wall. The protective pipe 3 is provided with a corrosion-protecting curing material coating 4. The metal protective pipe is provided with an external thread on its end 5 to be connected to the pipe body 1 and is screwed with this external thread end directly into the pipe body 1 provided with an internal thread. The protective pipe is screwed into the pipe body 1 until the front surface of the protective pipe end 5 comes into metallic contact with the inner surface of the pipe body 1. This metallic contact between the axial sealing surface of the protective pipe end 5 and the axial counter surface 6 of the pipe body 1 ensures that a gas-tight connection between the protective pipe 3 and the pipe body 1 is maintained that satisfies the fire protection regulations and that no gas can escape into the building if the normal gas-tight connection of the plastic pipe 2 to the pipe body 1 is destroyed by the effects of heat. For the normal gas-tight and tensile connection of the plastic pipe 2 to the pipe body 1, the end of the plastic pipe 2 is tightly and firmly welded into a plastic bushing 7, which is made of a plastic material that can be welded or melted with the plastic material of the plastic pipe 2. To increase strength, the plastic pipe end and

a metallic support sleeve 8 is arranged in the protruding part of the plastic bushing 7. The metallic protective tube 3 is formed on the inside with an axial stop shoulder 9. In the section of the protective tube 5 with the larger inside diameter, the plastic bushing 7 is firmly sealed between the axial stop shoulder 9 of the protective tube and the axial inner surface 6 of the tube body 1, so that the plastic tube 2 together with the plastic bushing 7 is positively secured against being pulled out of the tube body 1 by the stop shoulder 9. So that the protective tube 3 can be screwed into the tube body 1 up to the aforementioned metallic gas-tight contact with the latter, the plastic bushing 7 has an axial length which corresponds to the axial length of the section of the bushing with the larger inside diameter. pipe end 5, or is slightly shorter. The gas-tightness between the plastic bushing 7 and the pipe body 1 is achieved by an arranged on the axial inner surface 6 of the pipe body 1 and resting on the front surface of the plastic bushing 7; and axially elastically compressible O-ring 11. The G 2 ε seal between the adjacent cylindrical surfaces of the plastic bushing 7 and the protective pipe end 5 is achieved by preferably two O-ring seals 11 which are arranged on the cylindrical outside of the

Plastic bushing 7 are arranged.

Claims (1)

MetaLlwerke Gebr. Seppe Lfricke GmbH & Co., Gelsenkirchen Wall duct fitting for connecting a plastic gas supply line to a metal house line Protection claim Wall duct fitting for connecting a plastic gas supply line, which is led through a masonry opening, to a metal house line, whereby a pipe body which can be screwed to the metal pipe receives the inserted plastic pipe end in a sealed manner and is clamped in place to prevent it from being pulled out, and whereby a metal protective pipe which envelops the plastic pipe over a length section is connected to the pipe body via a screw connection, characterized in that the protective pipe, which is provided with an external thread at one end (5), is screwed into the metal pipe body, which is provided with an internal thread, until an axial sealing surface of the protective pipe comes into metallic contact with an axial counter-surface of the pipe body, and that the plastic pipe end is welded tightly and firmly into a plastic bushing (7), and this plastic bushing is inserted into the protective pipe end (5) screwed to the pipe body (1) between an inner axial stop shoulder (9) of the protective pipe and an axial Inner surface (6) of the tubular body is held in place, sealing rings (10, 11) being arranged between the inner surface (6) of the tubular body (1) and the end face of the plastic bushing <7> facing it, as well as between the opposite cylindrical surfaces of the protective tube (3) and the plastic bushing (7).