JPS61502006A - A joining device that permanently joins pipes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] A connecting device that permanently connects g i ′f A connecting device that permanently connects ξ eve , the pipe end is compressed by an axially moving compression ring, resulting in Cold-open molding occurs within the area and no? Positive leak-free connection with coupling pieces of Eve fittings For example, the forming apparatus is described in US Pat. No. 3,149,860, US Pat. In many examples such as No. 498648, No. 3528689, No. 4061367, etc. Are known.

This type of coupling device provides good mechanical strength and good leakage protection. It is possible to easily create e-beam bonds with physical properties that require less time and materials. From this point of view, its consumption is relatively small.

However, in practice with this type of pipe connection, in certain applications, the quality of the above physical properties is not maintained over a long period of time, on the contrary, as a result of corrosion and erosion effects for a relatively short period of time is known to deteriorate to an unacceptable degree over time, resulting in failure of the ing.・ If the pipe end is e.g. If it is fixed in the joint piece like the Nonobu joint according to No. 67 (Fig. 5), the flow will be reduced. When a body medium flows through a pipe at high speed, turbulence may occur on the end face of the pipe end or on the two / It occurs at the junction of the curved ends, resulting in a shoulder or gap. This turbulence is coupled This creates an erosive effect on the inner walls of the pieces, i.e. material is removed from the joining pieces until the joining pieces eventually fail. (and/or from the eve end). This disadvantage is due to the fact that the joints are constructed in a suitable manner. Although this can be largely avoided if the pipe connections are made correctly, Despite this, 5. It is important to ensure that the e-tube ends are cut correctly. . However, in all applications where pipe connections are not made in a factory, e.g. on construction sites. does not guarantee that the required high accuracy will be maintained.

In this regard, for example, U.S. Pat. Pipe connections such as No. 67 (Figure 10) where the e-tube end is placed outside the connection piece. Several problems arise. In these examples, the axis of the pipe fitting with the connecting piece There are no discontinuities within the channel cross-section in the direction. Opposite number (, here, the joining of the ends of the joining piece The area at risk is the connecting piece, surrounding it, and a slip fit. As a result of the capillary infiltration of the pipe liquid into the gap between the pipe and the 7" wall, This is because crevice corrosion occurs and the pipe is attacked from the inside and gradually breaks. On top of that, The discontinuity in the flow cross-section change at the end of the coupling piece also creates turbulence, which Erosion occurs within the eclipse bond area.

The present invention is a coupling device of the type mentioned in the preamble, which overcomes the above-mentioned drawbacks and increases the service life of pipe couplings. It is intended to provide a coupling device that can be avoided in order to improve performance.

Starting from the elucidation shown in FIG. 5 of U.S. Pat. No. 3,528,689, the present invention The present invention relates to a coupling device according to claim 1.

The gap between the connecting piece and the gib end, and therefore the risk of crack corrosion, is This can be avoided by compression bonding of these parts at the same location. therefore , in the present invention, the compression ring has an annular inner bead at its trailing end; , when the compression ring is pushed onto the sleeve, the sleeve material is pressed against the back end of the sleeve. moving radially inward at the length of the coupling piece with respect to the length of the compression ring, hence The location of the annular recess that occurs at the rear end of the sleeve and is located within the Q-beam end of the coupling piece The free end is chosen so that it does not protrude beyond the lowest point of the recess.

In this way, 1. If the e-beam joint is made correctly, the compression joint will close to the end of the joint piece. section, thus ensuring that there are no gaps between the pipe end and the connecting piece. .

The coupling piece is made of -ξ end and its outside to obtain a positive bond.

In contrast to the coupling piece according to FIG. 5 of US Pat. No. 3,528,689, which has an annular groove on the side. , is preferably designed as a smooth hollow cylinder. In this patent, the connecting piece is )2 I do not think that the Eve bond must be transformed when it is created. Therefore, the connecting piece The wall thickness is large, resulting in a relatively sharp increase in the flow velocity of the fluid medium and therefore erosion, The increased risk of turbulence occurring at the inlet edge of the coupling piece occurs within the region of the coupling. .

In contrast, the wall thickness of the smooth joint piece must be kept thinner, so When a pipe connection is made, jointly deform the ξin'' end and the connection piece. becomes possible. At the same time, the risk of erosion is reduced.

5 If at the free end of the connecting piece its inner wall extends at least approximately to the point of intersection with its outer wall, If the area is gradually widened, the risk of erosion can be further reduced. like this , an axis with virtually no discontinuity that causes turbulence and obtains in the pieo coupling. A cross section of the channel in the linear direction can be obtained.

When the connecting piece is designed as a smooth hollow cylinder, the pressure that may be applied The tensile stress within the compression ring becomes excessive, causing pressure on the sleeve, e-blade end, and coupling piece. The shrunken material may be stressed beyond its yield point at that location.

In order to eliminate this drawback, the coupling piece can receive the material displaced by the compression ring on its outside. It has at least one annular groove for opening.

In this way, the pressing force of the compression ring is low, as well as the anti-ebbing end and the connecting piece. It becomes possible to obtain a positive and complete connection between the two parties. At the same time, compression The scissor pressure required to press the button is reduced. The joining piece is slightly deformed, thereby , the desired degree of positive bonding is obtained with slight deformation operations and therefore no effort is exerted on the bonding device. Prevents the end of the guide from loosening from the connecting piece under tension. Moreover, the deformation of the joint piece Due to its small size, the flow path cross section of the e-beam joint remains virtually constant.

Pulled and rolled ξves may have longitudinal scratches on their inner walls, and these scratches are produced as a result of fabrication and are completely invisible in the bond area during cold-open forming, resulting in a leaky bond. It is easy to make a coincidence. The disadvantage of this is that if the coupling piece is located in the area of its outer annular groove, It can also be salvaged if it has a peripheral lip with one sharp edge tip. This hand Any longitudinal scratches due to steps? When the eve is compressed, it is shut off and sealed.

Peripheral lips are placed appropriately where the compressive force is greatest.

An exemplary embodiment of the invention is shown in the drawing in partial longitudinal section. Figure 1, fig. Figure 2 shows a coupling device for coupling two respective tubes to each other. Left side of each drawing shows the parts of the coupling device in the assembled state before the compression ring is compressed, while the The resulting Q-ib connections are shown on the right side of these figures. Figure 3: /Give joint Another example is shown.

The coupling device according to FIG. It consists of a rib 3 and a compression ring 4. Connecting piece 1 is designed as a smooth hollow cylinder and inserted into the straight curved end 5. , Q-ib fitting 2 has flange 6 The pipe end 5, sleeve 3, and compression ring 6 approach this flange. . The sleeve 3, which is pushed over the pipe end 5, is provided with an annular outer bead 7. It will be done. When the compression ring 4 is pushed in the direction of the arrow, the sleeve 3 deforms and slides out. The Q-beam material moves radially inwardly in the bead area 8 and the Q-beam end 5 and the connecting piece 1 and obtains an annular recess 9 at this point, and at the same time, mutual (IC active and leak-free) Compressed to combine.

The compression ring 4 has at its rear end an annular inner bead 10 which is fitted with a compression ring. When the ring 4 is pushed onto the sleeve 3, the sleeve material is compressed to a radius at the rear end of the sleeve. move inward. At the same time, another annular recess 11 is formed between the pipe end 5 and the connecting piece 1. appear and these parts are compressed at the sleeve end 5. Length of compression ring 4 The length of the connecting piece 1 with respect to the axis and therefore the axial position of the recess 1j The end is chosen so that it does not protrude beyond the lowest point of the recess 11. This caused a pickpocket. The magnitude of the pressure acting on the joint piece 1 at the end of the joint is maximum at the end of the joint piece. ensure that cold working is carried out. Transition of the channel cross-section at the end of the coupling piece In order to make the connection as continuous as possible, the end 12 of the joining piece should not have any edge surface other than the edge. It should not be. For this purpose, the inner wall of the connecting piece 1 should be at least approximately at its intersection with its outer wall. The gap is gradually widening.

In certain cases, the connection at the flange 6 of the pipe fitting 2 may be interrupted by a liquid or gaseous medium on the outside. -Protect the pipe from entering the connection point between the pipe end 5 and the pipe fitting 2. It may be appropriate to Seal breakage is also caused by compression/gage 4 in this regard. This is properly achieved as a result of compression.

For this purpose, the sleeve 3 is fitted with another outer bead 13 at its front end, this bead When the compression ring 4 is pushed onto the sleeve 3, the edge 14 of the pipe end 5 compressed radially inward at the top.

The pipe has an edge 14 to facilitate the insertion of the coupling piece 1 into the pipe end 5. It is pushed into a conical shape at the zero point.

If the coupling device according to FIG. 2 is used, for each It consists of one sleeve and a compression ring 24. The connecting piece 21 is designed in the shape of a hollow cylinder. and inserted straight into the eve end 5. A compression ring is placed on the outside of the connecting piece 21. There are two annular grooves 35, 36 for receiving the material moved by the tool U. Nomii Joint n is flange: l! 6, with this flange facing the pipe end 5, Sleeve O and compression ring U approach. , e e f A sleeve pushed onto the end 5 The ring n is provided with an annular outer bead I. The compression ring 24 is pushed in the direction of the arrow. As the sleeve deforms, the sleeve material moves radially inward within the bead area. The rib end 5 acquires an annular recess 9 at this point and at the same time connects the connecting piece 21. compressed together to form a positive leak-tight connection.

The compression ring 24 has an annular inner bead at its rear end that is compressible. When ring U is pushed onto sleeve n, the sleeve material is cut in half at the rear end of the sleeve. Move radially inward. At the same time, another annular recess 31 is formed between the two-way end 5 and the connecting piece 2. 1 and these parts are compressed at the sleeve end. compression ring tone The length of the coupling piece 21 and therefore the axial position of the recess 31 with respect to the length of the coupling The free end of the piece 2 is chosen so that it does not protrude beyond the lowest point of the recess 31. to this thing Therefore, the magnitude of the pressure acting on the coupling piece 21 at the sleeve end is Ensure that cold working is carried out at maximum locations. At the end of the joining piece In order to make the transition of the flow path cross section as continuous as possible, the joint end 32 should not be connected anywhere other than the edge. It must not have any edges. For this purpose, the inner wall of the coupling piece 21 is at least The area is gradually expanded to almost the intersection with the outer wall.

In certain cases 1. e If a liquid or gas medium connects that part of the flange of 7 from outside? Prevent it from entering the connection point between the blade end 5 and the blade joint n. Sometimes it is appropriate to protect. Seal isolation is also provided in this regard by compression ring 24. This is properly done as a result of the compression that occurs.

For this purpose, the sleeve has at its front end another annular external bead, which When the compression ring prisoner is pushed onto the sleeve, the edge of the tube end 6 This edge is compressed radially inwardly into the annular outer groove 36 of the coupling piece 21. Moving.

FIG. 3 shows another embodiment of the pipe fitting, which is similar to that shown in FIG. Each Eve fitting Similarly, each coupling piece 41 has an annular groove 42 on its outer side. Moreover, the annular groove 42 There are two peripheral ribs within the area, which have a triangular cross-section and therefore have a sharp tip. have.・When the ξ-ib is pushed upward, these peripheral ribs 43 are inside the pipe. penetrate inside the wall. As a result, any longitudinal flaws on the inner wall of the pipe are interrupted and sealed be done.

As is known, no? Special with interchangeable grips for Eve binding Pliers are used, and in the illustrated embodiment these are compression rings and... Eve fitting flange or two compression rings.

The above coupling device is suitable for all types of pipe couplings, especially metal pipes and plastic/two-piece pipes. Suitable for combining both with

A pipe fitting is coupled to this. It is made of the same deformable material as e-ive. preferable. Coupling devices can be used not only for pipe conduits, but also for mechanical tubular structures, e.g. scaffolding. also has possible uses.

Metal pipes may be made of, for example, aluminum, copper and their alloys, or suitable types of steel. It can be composed of

FIG.1 FIo, 2 FIG.3 International Search Report MTI/”IJIIAI-117ANNEX To T+-i rNTERNATIONAL 5EARCH 5PORT ON

Claims (1)

[Claims] (1) A coupling device for permanently coupling pipes, with the pipe end (5) oriented in the axial direction. is compressed by the compression ring (4) moving into the area resulting in cold forming in the area. and a coupling piece (1) inserted into the pipe end and belonging to the pipe joint (2). forming a positive connection, and furthermore there is a sleeve (3), said sleeve being connected to said pipe. is pressed onto the end and has an annular outer bead (7), and the compression ring is compressed. deforms when the sleeve material is radially deformed in the bead area (8). moving inwardly, further said pipe fitting has a flange (6), said flange a pipe coupling device in which the pipe end, the sleeve, and the compression ring approach each other until In the position, said compression ring (4) has an annular inner bead (10) at its rear end. In other words, the bead is pressed against the sleeve (3) when the compression ring is pushed onto the sleeve (3). Compressing the rib material radially inwardly at the rear end of the sleeve and compressing the compression ring. (4) the length of said coupling piece (1) in relation to the length, and therefore at the rear end of said sleeve; the axial direction of the annular recess (11) occurring in and located in said pipe end (5); The position is such that the free end (12) of the coupling piece does not protrude beyond the lowest point of the recess. Pipe joining device selected for. (2) In the pipe coupling device according to claim 1, the coupling piece (1) is slidable. Pipe coupling device designed as a straight hollow cylinder. (3) In the pipe coupling device according to claim 2, the coupling piece (1) is self-contained. At the end, the inner wall is gradually widened at least approximately to its intersection with the outer wall. Pipe coupling device. (4) In the pipe coupling device according to claim 1, the sleeve (3) is At its front end it has another outer bead (13), said bead being connected to said compression ring (4). ) on the edge (14) of the pipe end (5) when pressed onto the sleeve. A pipe coupling device that is compressed radially inward. (5) In the pipe coupling device according to claim 1, the pipe joint (2) is a pipe coupling device made of the same deformable material as the pipe to which it is coupled. Place. (6) In the pipe coupling device according to claim 1, the coupling piece (21) is On the outside thereof, at least one for receiving the material moved by said compression ring (24). The pipe coupling device also has one annular groove (35, 36). (7) In the pipe coupling device according to claim 6, the annular groove (35, 3 There are two 6), each of which is attached to the outer bead (27, 33) of the sleeve (23). Pipe coupling equipment located within the area of (8) In the pipe coupling device according to claim 6, the coupling piece (41) is at least one circumference with as sharp a point as possible in the area of its outer annular groove (42); Pipe coupling device with side lip (43).