FI74123C - FOERFARANDE OCH PRODUKT FOER FRAMSTAELLNING AV ROERSKARV UTAN SVETSNING. - Google Patents

Description

1 74123

METHOD AND PRODUCT FOR PIPE MAKING II MAN WELDING

The invention relates to a method and products for producing a flange joint without welding and prior to changing the ends of the pipe ends, cutting and deburring prior to joining the joint, especially for use in connection with thin-walled and also seamless pipes, which are widely used in the process industry.

A few methods are known for the production of pipelines without welding joints and without the pre-fabrication of the pipe end joint, for example from DE-A-2022 287 and SE-pat. La. 151 804. These connections are made by means of a threaded connection piece-15, a union nut and a connection ring. When tightening 1 connecting piece and nut, the connecting ring between them in the former presses a groove in the wall of the pipe and in the latter it partially presses into the wall of the pipe.

The disadvantage of these joints is their expensive price. For example, in a joint according to DE-A-2022287, in addition to a special connecting piece, 2 connecting nuts and a connecting ring as well as seals are required to make one joint. Because the shapes of the connector and the union nut are quite complex in both joints and, in addition, they are threaded, their manufacturing costs are high, which naturally raises the price of these joints.

The joints according to Figures 2 and 3 of DE-A-3 014 158 are also produced without welding and by pre-shaping the ends of the pipe ends 30 by means of conical flanges. When tightening the flanges with screws, the connecting ring between the flange and the pipe tends to press into the wall of the pipe, as a result of which a force holding the connection is created.

2 7 412 o However, the parts of these joints, especially the joint ring of the joint in Fig. * 5, are so complex and the parts in general require good dimensional accuracy. This disadvantage makes the production of parts expensive and thus the cost of these lijtns-5s also becomes high.

In addition, there is a known joint in which the retaining force and sealing of the pipe ends is provided by a flange ring i der. (cutting ring connection).

Since the uniform tightening of the play: the tightening of the ring is achieved with tightening nuts, the Ti Ti connection is not practical for large (over 0 4 Γ) ... 5 0) pipe diameters. In addition, the operating principle requires high dimensional accuracy and a good quality external surface for pipes that cross k. Thus, such connections are generally used only in high-pressure hydraulic systems; (precision orifice tubes) or in the case of small copper or similar tubes.

Other known methods and products, such as those known from DE-A-3014158 (Fig. 1), which provide pipe joints without welding, require pre-shaping of the pipe ends either by machining, which requires high wall strength, or by forming a flange at the pipe end. In both cases, the manufacture of the joint requires special equipment, which increases costs, especially in the installation conditions.

In addition, when flanging is used, there is a strong tensile yield in the pipe, which, for example in the case of welded pipes, easily causes cracks at the end of the pipe and thus deteriorates the quality of the joint.

The splicing method according to the invention and the products with which the splicing is provided have advantages over known methods. The method is applicable to Norma a - i.

3 74123 list for steel and stainless steel pipes used at lower pressures (eg nominal pressures 1D ... 16). No special requirements are set for the dimensional accuracy of the pipe and the quality of the surface, and the connection is also well suited for welded pipes. In addition, the cost of the joint according to the method is obtained because the products required for making the joint can be manufactured advantageously by the serial production method Imi n and the manufacture of the joint itself is relatively fast.

The method and product according to the invention are characterized by the elements set out in the claims.

The invention will now be described in detail with reference to the drawings, in which

Figure 1 shows a pipe joint according to the invention as a crack-15 roof before tightening the joint.

Figure 2 shows a cross-section of the finished pipe connection according to Figure 1.

In the connection according to Figures 1 and 2, flanges (2), wrestling rings (3), conical connection-20 rings (A), sealing rings (5), support rings (6) and a seal (7) between the support rings are placed at the ends of the pipe (1). When the connection is tightened by means of screws (8), the press ring (3) presses the connection ring (4) supported by the support ring (6) so that its sharp edge opposite the tube (1) tends to press into the tube (1). This forces the end of the pipe (1) to move in the direction of the longitudinal axis of the pipe when the connection is further tightened. In this case, the conical surface in the support ring (6) causes the end wall of the tube (1) to bend conically. In the finished joint according to Figure 2, the holding force 30 of the joint is the result of this curvature of the end of the pipe (1) and, in addition, the intersection between the pipe (1) and the connecting ring (4). Between the tube (1) and the support ring (6)

Claims (2)

4 74123 tightness is provided by a seal (5) flattened in the finished connection between the connecting ring (4) and the support ring (6), the support rings (6) being shaped so that a seal (7) can be placed between them to provide the support rings (6) tightness between. One embodiment of the invention is a joint in which the pressure ring (3) is an integral part of the flange (2). PATENT REVIEW A method and product for providing a flange joint type connection between the ends of pipes (1) used in industrial piping, comprising flanges (2), press rings (3), connecting rings (4), support rings (6), seals (3, 7) and screws ( 8) 1. found that when tightening the connection with screws (8), the press ring (3) presses the conical connecting ring (4) supported by the support ring (6), whereby the connecting ring (4) further presses against the conical ring of the support ring (6). part and at the same time the edge of the connecting ring (4) is partially pressed into the wall of the tube (1) as the germination ring (a) of part 1 i presses against the support ring (6) and the bent wall of the end of the tube (1) flattening the seal (3) With a parasitic seal (7) pressed between the support rings (6) into a special sealing groove formed in the support rings (6). A method and a product according to claim 1, characterized in that when manufacturing the connecting ring (4) by stamping from a plate, the manufacturing steps are designed so that the edge of the connecting ring (4) against the pipe becomes as sharp as possible. li