DE3007509A1 - DEVICE FOR CONNECTING TWO TUBES - Google Patents

Description

_ ₄ . 30Q7509

The invention relates to a device for connecting two pipes according to the preamble of the claim 1.

In a known device of this type, the first part of the connecting body is designed as a pipe socket, onto which the second part can be screwed in the manner of a union nut. This second part has an in the end of the first part with an extension! engaging tubular approach, which together with the end of the sleeve bounds an annular space for receiving a ring seal. Between this ring seal and the receiving area of the socket for the first pipe end is located opposite the receiving area Extended ring area in which a locking device is housed in an axially displaceable manner. This locking device consists of a ring body with resilient claws or teeth on the inner circumference, which can dig into the material of the first pipe end and pull this pipe end out of the Prevent connecting device, but without a limited axial mobility of the first pipe end in to hinder the connecting device.

Such a device is useless in the absence of adequate tightness in pipes that form a pipeline for the transport of gaseous or of

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to form liquid media under pressure The known connecting device requires a considerable amount for its union with the first pipe end On-site assembly work, but does not result in any Tension-proof connection of the parts, since the locking device is only a safeguard against being pulled off again of the connecting body forms from the first pipe end Such a fuse is set. assume that the The first pipe end is made of plastic, and when the safety function occurs, this will be damaged The pipe end enters the outer circumference, especially with gas supply lines For buildings, the pipe that is the first end of the pipe often consists of a metal pipe, especially if it is a main line pipe to which supply lines to the individual Buildings or parts of buildings are to be connected.

The invention is based on the object of a connecting device the type specified in the preamble of claim 1 to create a factory-prefabricated Forms unit that can be produced quickly and easily without assembling its individual parts at the location of a Connection to the first pipe end is reliably sealing and tensile strength connectable and one Connection to the second pipe end made possible by welding or gluing. The invention solves this problem by the features of claim 1. Further issues

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arrangements result from the subclaims.

The connecting device according to the invention is simply pushed onto the first pipe end This can be combined without requiring additional screwing or other assembly work. All components the connecting device are joined together to form a unit that cannot be separated without destroying it surrounds a first pipe end inserted in the connection end position with a double seal and with this in Double-sided tensile engagement is available as soon as the locking ring is in its locking position in the locking groove of the first end of the pipe. While maintaining a tight and tensile connection, the connecting device is rotatable around the first pipe end and thus alignable.

In the following, an embodiment of the subject matter of the invention is explained in more detail with reference to the drawing which reproduces a preferred connecting device in an axial half section.

The connecting device shown consists of a connecting body 1 made of plastic, in particular polyethylene, which comprises two parts 2 and 3. The first part 2 is formed by a substantially cylindrical sleeve, which have a first receiving area 4 for a first pipe end 5 and a second receiving area 6 in their presents a cylindrical interior, in which a second pipe end 7 of a plastic pipe, in particular polyethylene

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pipe, welded or glued. The pipe to be fixed with its end 5 in the connecting body 1 is made as is increasingly common in the gas supply sector from a tubular body 8 made of metal, the. on the outside with a plastic coating 9 is provided, which ends at a certain distance in front of the front edge 10 of the pipe end 5. In its area free of a coating 9 is the first pipe end 5 with a circumferential in a radial plane Securing groove 11 is provided, which preferably has an approximately semicircular cross-section, but one may have a different cross-sectional shape. The cross-sectional shape depends on the cross-sectional shape of a for the determination of the security link to be used and / or according to whether and to what extent e.g. the securing member in the securing groove is to be given a certain axial displaceability, as may be the case may be desirable to compensate for pressure surges, but does not have to be present. On the outer circumference the first pipe end has 5 bevels 12, 13 to make it easier an insertion of this pipe end into the safety device.

In the receiving area 4, the sleeve 2 has a first ring seal 14 in an inner circumferential groove 15. One second ring seal 16 is located in an inner circumferential groove 17 in a receiving area 18 for the first Tube end 5, which is formed by the second part 3 of the fuse body. This receiving area 18 has an inner

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diameter which corresponds essentially to the outer diameter of the pipe end 5 in j enem the receiving area 18 in the connection end position of the parts opposite area. In the example shown, it is a stepped area 9 ^{1 of} the plastic sheathing 9 at the first pipe end 5 with a reduced diameter.

The second part 3 of the connecting body 1 comprises one tubular extension 19 with an inner widening 20 for the positive reception of the end of the sleeve 2, which is welded to the extension 1 9 in the area of its overlap with this, but instead also glued, can also be screwed if necessary. The inner extension 20, like the sleeve end, can be cylindrical or light be conical in shape.

The receiving area 18 is on the inside by a radial Limited shoulder surface 21, to which a cylindrical circumferential surface 22 is connected axially inward, the one larger diameter than the receiving area 18 but a slightly smaller diameter than the inner extension 20 owns. The surfaces 21,22 together with the end face 23 of the sleeve 2 delimit an inward direction open groove-shaped chamber 24 in which a locking device is fixed. This exists in the case of the one shown Example of two ring bodies 25, 26 made of metal, arranged coaxially directly next to one another, are given

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if also high-strength plastic, which together have one Form cage bodies for a locking ring 27 divided along a radial surface. The one in the drawing left ring body 26 has an approximately T-shaped cross-sectional shape on, while the right ring body 25 has an approximately rectangular basic shape. In the area At its inner corners, the ring body 25 is provided with inclined surfaces 28, 28 '.

According to this design, the two ring bodies 25, 26 limit a circumferential inner pocket 29, which the locking ring 27 secures against axial displacement, but on the other hand this when inserting the the first pipe end 5 until the locking ring 27 can fall into the locking groove 11. The shape of the side walls of the inner pocket is in the illustrated preferred embodiment of the locking ring 27 of particular importance, since with the circular cross-section of the advantageously made of spring steel, split locking ring must be ensured on the one hand that when inserting the first Tube end 5 and the associated resilient expansion of the locking ring taken along with no cycle or is supported and can expand unhindered. At the same time, on the other hand, must come up with of the locking ring 27 in its locking groove 11 be guaranteed that in both directions, in particular but in the withdrawal direction, a tensile union

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is also retained if, for example, considerable axial loads occur in the course of pressure surges. The bevel 28, which presses the securing ring into its securing groove 11 with a corresponding pulling direction, has a particular effect on this .

Instead of the two-part cage body shown, which facilitates the assembly of the parts 25,26,27 in the chamber 24 before inserting and welding the sleeve 2, a one-piece cage body can also be provided, in which case the retaining ring is prior to insertion would be contracted accordingly in the inner pocket 29 to be brought into place.

The T-shape of the ring body 26 offers a recess on the side facing the end face 23 of the sleeve 2, which is primarily of importance in the case of a welded connection of parts 2, 3, because this recess is used for receiving a weld bead can be used, which may be when the to be connected to their Plastic parts heated to melting temperature can form.

The ring bodies 25, 26 are in the chamber 24 at a distance from and also with the delimiting wall surfaces a parting line between each other. However, this is only for the sake of clarity of illustration

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been given. In practice, not only do the ring bodies 25, 26 bear directly against one another, but they touch also the boundary surfaces for a backlash-free definition.

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Claims (4)

Busse & Busse patent attorneys Dipl.-Ing. Dr. iur. V. Busse Dipl.-Ing. Dietrich Busse Dipl.-Ing. Egon Bünemann Händellaan 251 D-4 5 Ο Ο Osnabrück GroBhandelsrlng 6 ■ Postlach 1226 AD ZWOlle, Netherlands ' Telephone ^^) 588081 and 586082 Telegrams: patgewar Osnabrück February 27, 1980 DB / Ka Expectations: 1 .J device for connecting two pipes with a facing end of the pipes in the connection position of the parts encompassing connecting body made of plastic, which has a first receiving area with sealing and locking members for the sealed definition of a first pipe end and a second receiving area in which the second . The pipe end can be welded or glued in, the connection body consisting of two parts that can be connected to one another in the area of mutual overlap, one part of which presents receiving areas for both pipe ends and of which the second part in turn has a receiving area for the first pipe end its inside diameter is essentially matched to the outside diameter of this pipe end, characterized in that the first part (2) of the connecting body (1) is formed by a substantially cylindrical sleeve which is located in the receiving area (4) for the first pipe end (5 ) has an annular seal (14) arranged in an inner circumferential groove (1.5), the second part (3) of the connecting body in a tubular extension (19) an inner extension (20) for a form-fitting reception of one end of the sleeve and is welded or glued to the sleeve end, in the receiving area (18) of the second part (3) of the connecting body, one arranged in an inner circumferential groove (17) another ring seal (16) is provided for the first pipe end, and in one of both parts of the Connection body limited inner, groove-shaped. Chamber (24) set a locking device is that by means of a resilient locking ring (27) on the circumference with a circumferential locking groove (11) provided first pipe end in its connection end position locked against axial displacement in the connecting body. 2. Device according to claim 1, characterized in that the locking ring (27) is housed in a circumferential groove-shaped inner pocket (29) of a cage body (25, 26) of the locking device, which secures the locking ring against axial displacement and this when expanding during insertion the first pipe end (5) receives. 3. Apparatus according to claim 2, characterized in that the retaining ring (27) is designed as a split, circular in cross section spring steel ring and the inner pocket (29) of the cage body (25,26) has radially aligned side walls, of which the 130036/0418 30Q7509 Front end (23) of the sleeve (2) facing side wall into a radially inner, circumferential inclined surface (28) transforms. 4. Apparatus according to claim 2 or 3, characterized in that the cage body consists of two separate ring bodies (25, 26) arranged coaxially directly next to one another, the side surfaces of which together delimit the inner pocket (29). 130038/0 418