FI67441B - FLAENSFOERBINDNING FOER TUNNVAEGGIGA ROER - Google Patents

Description

67441

Flange connection for thin-walled pipes

In the case of flanged joints for thick-walled pipes, an embodiment is generally used, in which a latch is turned at the pipe end, in which is placed a pouring ring which is gripped by an inner shoulder formed in the clamping flange.

This embodiment can also be applied to pipes with thin walls, provided that the required latch for the pouring ring is formed by deformation of the pipe wall.

This deformation has so far been performed separately e.g.

by mangling in a special machine.

The present invention is intended to provide a new flange connection for thin-walled pipes, which removes the need for pipe wall deformation in advance and of the required machine.

The invention thus relates to a flange connection for thin-walled pipes, the pipe to be connected is intended to be poured in place by mediating an around the pipe wall, arranged in this engaging pour ring 20 and a flange gripping ring formed in the flange.

Characteristic of the flange connection according to the invention is that in front of the pouring ring is arranged around the pipe end a sealing means with the task of also making stops against axial displacement of the pouring ring against the pipe end, that the pouring ring is a spiral spring filled with balls or the like. in a manner known per se, and that the flange attachment is so dimensioned that, upon eating the flange, it presses the coil spring with the balls or the like. during radial contraction of the coil spring, in the pipe wall 30 deforming it and thus forming a holding ring retaining latch.

Alternative detail designs of the invention are defined in claims 2 and 3.

In the following, the invention will be described in more detail with reference to the accompanying drawing.

Figure 1 shows a first embodiment of the connection before mounting.

2 67441

Figure 2 shows the same embodiment in mounted condition.

Figure 3 shows a second embodiment of the connection, in mounted condition.

By reference numeral 1 is indicated a pipe which in the example shown in the drawing is intended to be connected to a fixed connection, for example to a pump, denoted by reference numeral 2. On flange end 1 is applied a flange 3 which can be clamped to bolts by means of bolts. the connection 2 in threaded bores formed therein, a pitch ring which is constituted by a spring 4 preferably filled with balls 5, and a sealing ring 6. The flange 3 has an inner shoulder 7 for receiving the pitch ring 4 and the seal 6. The flange 3 inner shoulder 7 runs obliquely against the tube, tapered to the vicinity of its trailing edge where it preferably has the same radius as the pouring ring 4.

As the flange 3 is tensioned, its inner shoulder 7 projects at an initial pouring ring 4 in front of the seal 6 and initially deforms it somewhat as well. Since the seal 6 no longer yields and the flange 3 further engages the clamp, its inner shoulder 7 will push the pouring ring 4 into the wall of the pipe 1, which is deformed so that a pouring ring 4 receives receiving latch 8, as shown in Figure 2.

The embodiment of FIG. 3 differs from the embodiment of FIGS. 1 and 2 in that, instead of the deformable seal 6, a non-deformable support ring 9 is provided, which at its end abutting the connector 2 has a latch with fitted O-ring. ring 10 for sealing. The embodiment of Figure 3 provides a certain advantage in that the pipe wall deformation forming the latch 8 becomes somewhat sharper, but on the other hand, the sealing by the ring 10 is usually somewhat worse than the sealing by the deformable sealing ring 6 according to figures 1 and 2.

However, the invention is not limited only to the advantageous embodiments shown in the drawing. It can also be thought that the shoulder of the flange 3 can be allowed to be cylindrical and parallel to the pipe wall 1 if the cylindrical inner wall is arranged to hit the pouring ring high enough to be used at the flange of the flange so that it serves as oblique stop and in the same way as The 5 digits described will be pushed into the pipe wall.

The inclination ring consisting of a coil spring filled with balls or similar short reinforcing parts has in this context the very essential property that it can be compressed straight radially around without peripheral sliding along the pipe wall 1.

Claims (3)

67441 A flange connection for thin-walled pipes, wherein the pipe (1) to be connected is intended to be poured in place by mediating a disposable ring ring (4) arranged in this engagement ring (4) and one formed in the flange (3), gripping ring gripping ring, characterized in that in front of the pouring ring (4) is arranged around the pipe end (1) a sealing means (6; 9, 10) with the purpose of also acting as an axial displacement of the pouring ring against the pipe end , that the pour ring is a spiral spring (4) filled with balls (5) or the like. known per se and that the flange shoulder (7) is so dimensioned that, upon eating the flange (3), it presses the coil spring (4) with the balls (5) or the like, during radial contraction of the coil spring, in the tube wall (1) deforming it and thus forming a holding ring retaining latch (8). Flange connection according to claim 1, characterized in that the flange shoulder (7) is designed to decrease substantially conically inert against the tube (1) at the vicinity of the rear edge of the shoulder (7), where it has the same radius of curvature as the pouring ring (4). 3. Flange connection according to claim 1, characterized in that the sealing means arranged in front of the pouring ring (4) consists of a non-compliant support ring (9), preferably of metal, with a ring lock and sealing ring (10) disposed therein in its front front surface. .