KR20050108572A - Flexible tube coupling and method for connecting tube - Google Patents

Abstract

A coupling capable of flexibly connecting a pipe is disclosed. Such a flexible tube coupling is provided inside the outer tube, one rim of the outer tube, and when the pipe is inserted, the inner tube which is integrally connected to the outer peripheral surface of one end of the pipe, the outer tube and the inner tube flexible The diameter change absorbing part for absorbing the external force in the radial direction acting on the pipe, the flange protruding outward from the other edge of the outer tube in the radial direction, and the flexible connecting the outer tube and the flange And an axial change absorbing portion for absorbing axial external force acting on the pipe.

Description

FLEXIBLE TUBE COUPLING AND METHOD FOR CONNECTING TUBE}

The present invention relates to a pipe coupling and a pipe connecting method using the same, and more particularly, having a structure having an appropriate elastic force in the axial direction and the radial direction coupling of the pipe that can be flexibly connected to the pipe and using the same It relates to a pipe connection method.

In general, the most widely used method of transporting a fluid is to construct a pipeline in a ground or underground way to pressurize the fluid and move it far away.

Such a pipe line can be completed by assembling a plurality of unit pipes integrally with each other. Typically, a unit pipe is manufactured at a factory and then transferred to a construction site. To complete the long pipeline.

In addition, as a method of connecting the unit pipes transported to the site by a single type, a connection method widely used is classified into a welding method and a flange joint method.

In the case of the welding method, the two unit pipes are arranged to face each other, and then approached as close as possible and connected by butt welding.

In addition, the flange joint method is a method of attaching flanges to both ends of the unit pipe to weld the flanges to each other, or fasten the flanges with bolts or rivets.

However, this connection method has a problem in that the joint is relatively weak and there is no flexibility because the joint points of the unit pipes are connected by a rigid body such as weld beads or bolts.

Therefore, in order to overcome this problem, a flexible coupling having a proper ductility is inserted in the middle of the pipeline to prevent breakage due to thermal expansion and contraction of the pipeline.

However, despite the increase of safety by inserting flexible couplings at various points in the pipeline, accidents due to large water pipe rupture and gas pipe rupture are constantly occurring. Since the part is not exactly the same as the metal of the part of the tube body, the coefficient of thermal expansion and contraction between the joint and the body is different, so that the fracture is caused by accumulated metal fatigue due to repeated repeated expansion and contraction for many years. There is this.

Accordingly, the present invention has been made in view of the above, and an object of the present invention is to have a structure having an appropriate elastic force in the axial direction and the radial direction to fundamentally solve the cumulative fatigue such as expansion and contraction caused during piping connection By making the connection of the unit pipes extremely easy and allowing the pipe joints to perform the flexible coupling function, not only can the pipe construction cost be reduced, but the pipe life can be extended and the maintenance cost can be reduced. The present invention provides a flexible tube coupling of a pipe that can increase the savings and safety and a pipe connecting method using the same.

In order to realize the object of the present invention, the present invention is an outer tube; An inner tube provided inside one side of the outer tube and integrally connected to an outer circumferential surface of one end of the pipe when the pipe is inserted; A diameter change absorbing part configured to flexibly connect the outer tube and the inner tube to absorb an external force in a radial direction acting on the pipe; A flange protruding from the other edge of the outer tube in an outer radial direction; And it provides a flexible tube coupling comprising an axial change absorbing portion for absorbing the axial external force acting on the pipe by connecting the outer tube and the flange flexible.

Hereinafter, with reference to the accompanying drawings will be described in detail a flexible coupling of the tube according to a preferred embodiment of the present invention.

As shown in Figures 1 to 3, the flexible tube coupling provided by the present invention is provided on the inner tube (2) and the inner tube (2), the inner tube (9) is inserted into the pipe ( 3) and a diameter change absorbing portion 5 for absorbing the external force in the radial direction acting on the pipe 9 by flexibly connecting the outer and inner tube bodies 2 and 3, and the outer tube 2 of An axial change that absorbs an axial external force acting on the pipe 9 by flexibly connecting the flange 7 and the outer tube 2 and the flange 7 protruding outward from the other edge in the radial direction. It includes an absorbing portion (11).

In the flexible tube coupling having such a structure, the outer tube body 2 has a cylindrical pipe shape having a predetermined diameter.

In addition, the inner tube 3 is formed by extending one side edge of the outer tube 2 is bent inward.

The inner tube 3 may be manufactured by pressing a side edge of the outer tube 2 or the like.

That is, the edge of the outer tube 2 may be heated to a predetermined temperature, preferably about 700 ° C. to 800 ° C., and the heated outer tube 2 may be inserted into the mold and then manufactured by pressing.

At this time, the length of the inner tube (3) can be bent to have a length smaller than the length of the outer tube (2) can be prevented from interfering when connected to the other tube.

In addition, the diameter change absorbing portion 5 is provided between the outer tube 2 and the inner tube 3 to absorb the external force in the radial direction of the pipe (9).

The diameter change absorbing part 5 is formed when the inner tube body 3 is manufactured by pressing the one side edge 17 of the outer tube body 2.

In addition, the diameter change absorbing part 5 may have an appropriate elastic force by having the outer and inner tubes 2 and 3 having an appropriate elastic force disposed in parallel with each other and a gap formed therebetween.

Therefore, when an external force such as thermal stress or pressure acts on the flexible tube coupling 1 in the direction of the arrow 19, the external force may be absorbed by the elastic force.

The flange 7 can be manufactured by pressing the other edge 21 of the outer tube 2.

At this time, the axial change absorbing portion 11 is provided between the outer tube 2 and the flange 7 to absorb the external force acting in the axial direction of the pipe (9).

The axial change absorbing part 11 is made of a material having an elastic force between the flange 7 and the outer tube 2 and the flange 7 has a shape inclined at an angle with respect to the outer tube 2. It has elastic force.

Therefore, when the external force acts in the axial direction of the pipe 9, the external force may be absorbed by the axial change absorbing part 11.

Hereinafter, a method of manufacturing the flexible tube coupling having the structure as described above will be described in detail with reference to FIGS. 4 (a) to (e).

As shown in Fig. 4 (a), when the outer tube 2 is formed, a cylindrical pipe 15, preferably a cast iron pipe, having a predetermined diameter is prepared, and the pipe 15 is cut to an appropriate length. do.

And, as shown in Figure 4 (b) of the one side edge 17 of the outer tube (2), it is possible to form the inner tube (3) by bending the inside of the outer tube (2).

At this time, the method of bending the inner tube 3 can be performed by pressing one edge of the outer tube 2 by a press.

That is, the edge of the outer tube 2 may be heated to a predetermined temperature, preferably about 700 ° C. to 800 ° C., and the heated outer tube 2 may be inserted into the mold and then manufactured by pressing.

At this time, the length of the inner tube (3) can be bent to have a length smaller than the length of the outer tube (2) can be prevented from interfering when connected to the other tube.

In addition, the diameter change absorbing part 5 is formed when the inner tube body 3 is bent by bending one edge 17 of the outer tube body 2.

The diameter change absorbing part 5 is formed of a material having a certain degree of elasticity of the outer and inner tube bodies 2 and 3, and is disposed in parallel with each other to form a gap therebetween, thereby having an appropriate elastic force.

Therefore, when the external force in the arrow direction 19 acts on the flexible tube coupling 1, the external force can be absorbed by the elastic force.

Thus, after manufacturing the diameter change absorbing part 5, a flange is processed.

The flange 7 may be formed by bending the other edge 21 (Fig. 4 (b)) of the outer tube 2 in the outer radial direction, as shown in Fig. 4 (c).

That is, in the same manner as the manufacturing process of the inner tube (3), the edge of the outer tube (2) is heated to a predetermined temperature, preferably about 700 ℃ to 800 ℃ temperature range, the heated outer tube (2) to the mold After inserting, it can be manufactured by press working.

At this time, the axial change absorbing portion 11 is provided between the outer tube 2 and the flange 7 to effectively absorb the external force acting in the arrow direction 23.

The axial change absorbing part 11 is formed of a material having an elastic force between the flange 7 and the outer tube 2 and has a shape in which the flange 7 is inclined at an angle with respect to the outer tube 2.

Therefore, when the external force acts in the axial direction of the pipe 9 (FIG. 1), the external force can be absorbed by the axial change absorbing portion 11.

Through the manufacturing process as described above it can be produced a flexible tube coupling.

On the other hand, Figure 4 (d) shows a process of attaching the flexible tube coupling manufactured as described above to the pipe.

As shown, the flexible tube coupling 1 is inserted into one end of the pipe 9 so that the inner surface 25 of the inner tube 3 contacts the outer surface 27 of one side of the pipe 9. .

Then, the one end of the inner tube 3 and the pipe 9 coincide with each other and welded together to be integrally connected by a bead 29.

Therefore, the flexible tube coupling 1 may be attached to one side of the pipe 9.

At this time, since the welding process is performed by Lap-joint (overlap welding), a special welding functional worker such as butt welding is unnecessary in the unit pipe connection welding work, which is the most difficult task among pipeline construction works.

Since the strain does not act on the weld bead due to the nature of the superposition welding, there is no possibility of cracks in the weld due to the control of the welding speed and the adjustment of the weld bead thickness. Do.

In addition, in the above, it is limited to connecting both ends by welding, but the present invention is not limited thereto and may be connected by a bolt method.

1 and 4 (e) show a process of connecting one pipe with a flexible tube coupling as described above to another pipe.

As shown, after attaching the first flexible tube coupling 1 to one side of the first pipe 9, the second flexible tube coupling 32 is also applied to the corresponding second pipe 30 in the same manner as described above. Attach).

The first and second pipes 9 and 30, to which the first and second flexible tube couplings 1 and 32 are attached, are aligned with each other so as to correspond to each other.

At this time, the flanges 7 and 33 of the two flexible tube couplings 1 and 32 are in contact with each other.

In this state, the flanges 7 and 33 are matched with each other and welded together so that the two flexible tube couplings 1 and 32 are integrally connected to each other by the beads 34.

Therefore, the two pipes 9 and 30 may be integrally connected to each other through this process, and the two pipes 9 and 30 may be connected to each other in the axial change absorbing portion 11 and 11a and the radial change absorbing portion 5. , 5a) can effectively cope with external forces in the vertical direction or the horizontal direction.

And, Figure 5 shows a state in which an external force acts on a plurality of pipes connected through this process.

As shown, when an external force acts on the plurality of pipes 9 and 30 integrally connected by the plurality of flexible tube couplings 1 and 32, the outer side (I) of the flexible tube couplings 1 and 32 The inner force (II) and the inner side (II) are properly deformed with each other, whereby the external force can be effectively reduced.

That is, the length of the radial change absorbing portions 5, 5a of the flexible tube couplings 1, 32 provided on the outer side I increases, and the length of the axial change absorbing portions 11, 11a also increases. .

On the contrary, the lengths of the radial change absorbing portions 38 and 38a of the flexible tube couplings 1 and 32 provided on the inner side II are reduced, and the lengths of the axial change absorbing portions 11 and 11a are also reduced. .

Therefore, when an external force such as thermal stress or hydraulic pressure acts on the pipeline consisting of a plurality of pipes, the flexible tube coupling appropriately absorbs the external force, thereby improving durability.

As described above, the flexible tube coupling and the pipe connection method using the same according to the preferred embodiment of the present invention are adapted to deformation of the diameter change absorbing part and the axial change absorbing part when the position change of the pipe occurs due to external factors after the connection is completed. By absorbing the deformation within a certain range, there is an advantage to protect the pipeline by absorbing the deformation in a much wider range than the conventional pipeline with no deformation absorbing capacity.

In addition, in the present invention, the unit pipe connection welding operation is not a conventional butt-joint but a lap-joint (overlap welding). There is an advantage that the same special welder is unnecessary.

In addition, due to the nature of superposition welding, since no strain is applied to the weld bead, there is no possibility of cracks in the weld due to the control of the welding speed and the adjustment of the thickness of the weld bead. There are significant advantages, such as the possibility to skip work.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims, the detailed description of the invention, and the scope of the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

1 is a perspective view showing a pipe with a flexible tube coupling according to a preferred embodiment of the present invention.

FIG. 2 is a side sectional view showing the flexible tube coupling shown in FIG. 1; FIG.

3 is a front view of the flexible tube coupling shown in FIG.

4 (a) to (c) are flow charts showing the process of manufacturing the flexible tube coupling shown in FIG.

4 (d) shows attaching the flexible tube coupling shown in FIG. 1 to the pipe.

Fig. 4E is a view showing a state in which two pipes are connected to each other by a flexible tube coupling.

5 is a view showing a state in which a plurality of pipes are connected by a flexible tube coupling according to a preferred embodiment of the present invention.

Claims (5)

An outer tube; An inner tube provided inside one side of the outer tube and integrally connected to an outer circumferential surface of one end of the pipe when the pipe is inserted; A diameter change absorbing part configured to flexibly connect the outer tube and the inner tube to absorb an external force in a radial direction acting on the pipe; A flange protruding from the other edge of the outer tube in an outer radial direction; And And an axial change absorbing portion configured to flexibly connect the outer tube and the flange to absorb an axial external force acting on the pipe. The flexible tube coupling of claim 1, wherein the outer and inner tubes have a cylindrical shape. The flexible tube coupling of claim 1, wherein a length of the inner tube is smaller than a length of the outer tube. The first flexible tube cuffing is formed by processing one side edge of the outer tube and bending it inward to form an inner tube connected by the diameter change absorbing portion, and processing the other edge to form a flange connected by the axial change absorbing portion. Preparing a; Attaching a first flexible tube coupling to the first pipe by inserting an end of the first pipe into the inner pipe and integrally connecting the end of the first pipe; Inserting and fixing a second flexible tube coupling having the same shape as the first flexible tube coupling to an end of the second pipe; And Integrally securing the flanges of the first and second flexible tube couplings by corresponding the first and second pipes to each other, And a method of connecting pipes by a flexible tube coupling capable of absorbing external forces by the diameter change absorber and the axial change absorber when an external force is applied to the first and second pipes. 5. The method of claim 4, wherein inserting and attaching the first and second flexible tube couplings to the first and second pipes, respectively, and fixing the flanges of the first and second flexible tube couplings are welded. A method of connecting a pipe by means of a flexible tube coupling.