DE7640985U1 - SCREW CONNECTION FOR A GAS-CONVEYING PLASTIC PIPE - Google Patents

Description

The invention relates to a screw connection for a gas-carrying plastic pipe, in which on a support pipe the pipe end is plugged in a connection housing and sealingly on by means of a pushed-on clamping ring Support tube is pressed on by a union nut screwed onto the housing against a front face to the support tube concentric housing collar is pressed and radially compressed.

Plastic pipes for gas lines have so far been used because of various safety regulations not found widespread use. In a few cases there is a screw

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Bnngsanschluss has been used for gas-carrying plastic pipes, in which the pipe end is attached to a support pipe in a connection housing. By means of a slotted clamping ring pushed on from the outside, this pipe end is sealed on the support pipe provided with a serrated tooth profile. This slotted metal clamping ring is pressed at the end against a housing collar concentric to the support tube by a union nut screwed onto the housing and is thereby radially compressed.

Future legal regulations prescribe an internal support tube for such a screw connection, which is known. With this screw connection, the gas-tight seal only takes place between the inner wall of the pipe end and the support pipe. However, such a seal does not appear to be sufficient elastic seal required.

The object of the invention is to change the screw connection mentioned at the beginning so that a multiple Sealing is guaranteed with at least one elastic seal.

Such a screw connection is used to solve this problem of the invention characterized by an O-ring pushed onto the plastic pipe end, which is held by the

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Clamping ring against a conical sealing surface in the housing collar and is sealingly pressed against the pipe.

According to a preferred embodiment of the invention a closed plastic cycle control with a Wuistraiui pressed against the O-ring, the outer diameter of which is greater than as the mean diameter of the Komis area i in the housing collar is. In the well-known Wpj se both aui. '^ N am Fit the support tube as well as the inside of the clamping ring Sägezalm pro f'i 1 j be provided. With such a screw connection the well-known interior sealing is carried out between the interior wall of the plastic tube and the support tube, as well as an outer elastic seal see with the O-ring. An additional third seal is achieved by pressing the closed plastic clamping ring against the outer wall of the Plastic pipe as well as by the on the conical surface in The housing collar is placed on the beaded edge of the clamping ring.

The selection of the size of the outer diameter. ·· of the bead edge in relation to the mean diameter of the conical surface ensures protection of the O-ring, which can only be compressed to a certain extent.

For manufacturing reasons, it can prove to be advantageous to screw the support tube into the housing in a sealed manner.

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In such a case the connection must be two tone Ii?;,. The machining of the outer surface of the support tube and the The inner surface of the case is made easier by this,

Based on an illustrated hot game, the Invention explained in more detail below. It shows:

Fig. 1 is a partially sectioned view of a Verschi'aubung.sanschlusses

and

Fig. 2-5 i ⁿ a mounting structure which partially

cut items of this connection.

The end of the plastic tube 1 is small on the support tube 23 in the connector housing 2 and pushes with its front end against the stopper 22 This connector housing 2 has an end connector 28 and a housing collar 2 ~ formed concentrically around the support tube 23. It also widens a key surface 2J and «in external thread 21 in the vicinity of the Ge'niusebundes 25.

An O-ring 4 is pushed onto the plastic pipe end 1, the over the plastic clamping ring 5 "from siner on the thread 21 on the housing collar 25 screwed union nut pressed against a conical surface 26 inside the collar 25

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will. When tightening this nut 3 takes place both Pressing the plastic tube 1 on the support tube 2 3 provided with outer Sägezalir.profilierungen 2 ^ 4 as also the pressing of the O-ring from the outside against the Plastic pipe 1 and against the conical surface 2b.

On the union nut 3 », which is screwed with its internal thread 31 onto the external thread 2 1, an inner conical end face 2 , which acts against a corresponding bevel on the end face of the clamping ring 5. On the end face facing the O-ring h , the clamping ring has a bulged edge 51, the outer diameter of which is selected to be greater than the mean diameter of the conical surface 26. On the inside of the clamping ring 5, sawtooth profiles 52 are provided in known Vedse.

Through the selection of the outer diameter of the meniscus 5-1 2ο in relation to the mean diameter of the conical surface is achieved that this beaded edge touches down after a certain attraction of the cap nut 3 51 ^at the conical surface 26 so that the O-ring can not be further compressed .

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Compilation of the reference symbols

Plastic pipe

2 Connection loop 21 External thread 22nd Stop surface 23 Support tube 2k Sawtooth profiling 25th Housing association 2o Conical surface 27 Key area 28 Threaded connector 3 Union nut 31 inner thread 32 conical end face

5 clamp ring

51 WuIs trand

52 Sm ge / ahnnro f i I. i

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Claims (3)

ScI πι tzan speak 1. Screw connection for a gas-carrying plastic pipe, in which the pipe end is pushed onto a support pipe in a connection housing and is pressed sealingly against the support pipe by means of a pushed-on clamping ring, which is pressed at the end by a union nut screwed onto the housing against a housing collar concentric to the support pipe and is radially compressed , characterized by an O-ring (k) pushed onto the plastic pipe end (l), which O-ring (k) is pressed against a conical sealing surface (26) in the housing collar (25) and sealingly against the pipe (l) by the clamping ring (5). 2. Screw connection according to claim 1, characterized by a closed plastic clamping ring (5) »which is pressed with a beaded edge (51) against the O-ring (h) , the outer diameter of which is greater than the mean diameter of the conical surface (26) in the housing collar (25 ) is. 3. screw connection according to claims 1 and 2, in that (; ekenn /, e d dme t, that both the outside of the support tube (23) 7640985 05.05.77 as well as inside the Klernrnrj n _c 'j (5) "' ^{n, in a} manner known per se, saw-tooth profiles (2 ' ¹ I b; ^v .w. 52) are provided. ■ l. Screw connection according to claims J., characterized in that the support tube is sealed and screwed into the housing. 7640985 05.0577