DE3321260A1 - Thrust-proof insertion-sleeve connection for pipes - Google Patents

Abstract

A detachable, thrust-proof insertion sleeve connection for pressurised pipelines, in which the sleeve end and insertion end are secured in a positively-locking manner by means of a ring which is arranged in mutually opposite grooves, is constructed for simple preparation in the factory, or production on site where it is to be used, such that a sliding and sealing means (8), which cures, is arranged on the mutually opposite surfaces of the insertion end (7) and/or of the sleeve end (8), which means supports a round-wire expanding ring (9). <IMAGE>

Description

Shear-proof push-in socket connection for pipes

The innovation concerns a non-detachable, shear-proof plug-in socket connection for pressure pipes, at the socket end and spigot end through a ring arranged in opposing grooves are secured.

A connection of the type mentioned (DE-PS 9428) for cast iron pipes is known. To create a groove for an inserted lead ring or kit ring, there are at the insertion end Cast on collar rings. For manufacturing and technical reasons, this connection is for Steel pipes or asbestos-cement pipes are not suitable.

Plug-in socket connections for cast iron pipes (AT-PS 200 865) as well as plastic pipes and asbestos-cement pipes (DE-AS 1 182 483, DE-AS 1 249 o28, DE-AS 2 759 392), which has a form-fitting; shear-proof connection through angular Have rings, while the sealing function is taken over by rubber rings.

What all connections have in common is the high accuracy requirement and sharp edges of the grooves for the thrust locking rings.

The state of the art also includes adhesive bonds (DE-AS 2 600 621). The adhesive technology does not guarantee adequate shear protection.

It is also known to use positive connections in mechanical engineering, which are not gas- or liquid-tight due to round wire snap rings according to DIN 7993 to manufacture.

The task of the innovation is to create a socket joint for pipes to create that are simply prepared at the factory and just as easy at the point of use can be produced, i.e. without the need for welding, soldering or screwing technology, but still for gas, water and oil high pressure pipes made of steel, asbestos cement, Plastic and similar materials can be used.

In the case of a plug-in socket connection, this task is carried out at the beginning described in more detail solved that on the opposite Surfaces of the insertion end and / or the socket end have a hardening sliding and Sealing means is arranged, which supports a Rur.ãdrahtsprengring The innovation according to Push-in socket connection - the sockets and grooves are prepared at the factory - Can be produced on the construction site by unskilled workers.

There are only plug-in and / or socket ends with a sliding and to provide sealant and the shear locking ring towards the male end before pushing the tubes into each other. As a lubricant and sealant For example, a cold-curing epoxy resin is selected that provides an absolutely tight connection guaranteed The diameter of the ring, e.g. a split round wire snap ring, is chosen so large that it is slightly more than half the wire diameter in the Socket groove penetrates.

The hardened epoxy resin gives the ring the necessary support, so that it always remains in position and the connection cannot be broken.

The innovation has the following advantages in particular: The groove the shear locking ring does not need to be sharp-edged; thereby reduced the manufacturing effort and there is no notch effect in the connection.

- Commercially available, standardized round wire snap rings can be used will.

- A pipeline with a socket joint according to the innovation can be provided with an internal coating throughout; Gaps in the connection area of the pipes do not arise. The tubes could also be coated on the inside at the factory will.

An exemplary embodiment is illustrated using a schematic drawing the innovation explained in more detail.

A steel pipe 1 was factory-fitted with a thermoformed socket 3 provided, in which a groove 4 was sunk.

The socket end 5 was designed to facilitate the introduction of the pinned Insertion end 7 of the steel pipe 2 widened.

The insertion end 7 is also provided with a sunk-in groove 6.

To achieve the finished push-in socket connection shown, Before joining the steel pipes 1, 2, the socket 3 must be on the inner surface be coated with epoxy resin 8 as a lubricant and sealant. Then becomes a divided Round wire snap ring 9 pushed over the insertion end 7 into the groove 6 and the The area of the groove 6 is also coated with epoxy resin 8.

When inserting the insertion end 7 into the socket 3 of the steel pipe 1 the epoxy resin 8 evenly wets the surfaces to be connected; at the socket end 5 and at the insertion end 7 epoxy resin beads 8 ', 8 "are produced.

As soon as the groove 6 lies opposite the groove 4, the split round wire snap ring jumps 9 in the position shown.

The groove 4 has a depth of slightly more than half the diameter of the round wire snap ring 9, so that the round wire snap ring 9 with security in the groove 4 remains when the pipe connection is subjected to a tensile load. A spring-back of the round wire snap ring 9 in the groove 6 is caused by the supporting effect of the cured epoxy resin 8 avoided.

For the strength of the connection, the choice of fit is between the Diameters (inside) of the sleeve 3 and the spigot end 7 (outside) are decisive. The gap width lo should be between - 0.5 mm (press fit) and + 1.5 mm Steel pipe diameters from 40 - 500 mm.

A socket joint on steel pipes produced in this way 114.3 x 3.6 mm with a gap width 10 of 75 mm held more than roo in the test bar test pressure stood without leaking.

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Claims (1)

Shear-proof push-in socket connection for pipes Claim: Non-detachable, Shear-proof insert socket connection for pressure pipes at the socket end and spigot end positively through a groove in opposite one another arranged ring are secured, characterized in that on the opposite Surfaces of the insertion end (7) and / or of the socket end (5) a hardening one Sliding and sealing means (8) is arranged, which supports a round wire snap ring (9).