KR20140043611A - Dual pipe with strain compensation device - Google Patents

Abstract

The present invention relates to a dual pipe including a deformation compensation device and, more specifically, a dual pipe including a deformation compensation device, capable of improving durability and stability of a pipe and stably supporting an inner pipe by compensating expansion and contraction of the inner pipe in both a circumferential direction and a longitudinal direction. The dual pipe including the deformation compensation device in accordance with the present invention includes the inner pipe arranged in the center; an outer pipe having a space unit at a gap with the inner pipe; and the deformation compensation device which is installed on the circumference of the inner pipe and compensates the expansion and the contraction of the inner pipe. The deformation compensation device includes a support member installed in the inner pipe; a rolling member which is rolled by being attached to the inner circumference of the outer pipe and is installed in the support member to be able to rotate; and a pressing elastic member elastically supporting the rolling member in order to vertically move the rolling member.

Description

[0001] DUAL PIPE WITH STRAIN COMPENSATION DEVICE [0002]

More particularly, the present invention relates to a double tube having a deformation compensating device, and more particularly, to a double tube having a deformation compensating device, which can stably support the inner tube in a bending connection portion of the double tube while effectively compensating for a longitudinal expansion amount of a straight section adjacent to the inner tube, , It is possible to reduce the construction cost of piping and shorten the air, and it is possible to compensate the expansion and contraction in the longitudinal direction of the inner pipe and to compensate the expansion and contraction in the circumferential direction, And a durability and safety of the piping are improved.

Generally, in the industrial field, a double pipe is installed to supply steam or heat fluid safely and efficiently.

For example, as shown in FIG. 1, a piping system for supplying high-temperature steam includes an inner pipe 10 for moving high temperature steam, a heat insulating material 20 installed to surround the inner pipe, And the outer tube (30, also referred to as a protective tube) is disposed.

The insulation double pipes are connected to each other by expansion joints (not shown) for absorbing and mitigating the expansion due to expansion due to hot heat and settlement of the ground when they are installed along the underground or bridge piers, The space portion formed between the outer tube 10 and the outer tube 30 is kept in a vacuum state by extracting air to increase the heat insulating effect.

On the other hand, since the high-temperature steam of 130 ° C or higher is conveyed to the above-mentioned heat insulating double tube, deformation such as thermal expansion and heat shrinkage occurs in the inner tube and the outer tube formed of the metallic material. Particularly, since the inner pipe 10 is a pipe through which hot steam directly passes, the degree of deformation is so severe that damage or breakage due to concentration of stress is caused. Therefore, a device for compensating for expansion and contraction (hereinafter referred to as a deformation compensating device) Lt; / RTI >

Fig. 2 is a longitudinal sectional view for explaining a double pipe having a conventional deformation compensating device.

2 shows a longitudinal sectional structure of a thermal fluid transportation tube disclosed in Korean Patent Registration No. 10-0554682. The outer tube is spaced apart from the outer tube so as to form a hollow portion on the outer side of the inner tube 10, (10) is provided with a heat insulating material (20) for protecting the heat fluid and protecting the inner pipe itself.

A plurality of roller type flow members 40 are provided as a flow member on the outer side of the inner tube 10 to compensate for the contraction and expansion of the inner tube 10. The roller-type flow member 40 includes a clamp 42 that is interconnected and is releasably fixed to the inner tube 10, and a roller 42 rotatably provided on each of the clamps 42, And a roller 44 which is rotatably contacted with the roller.

As shown in FIG. 2, when the roller type flow member 40 is installed in the inner pipe of the double pipe, when the inner pipe is thermally expanded and heat shrank, the roller moves on the inner circumferential surface of the outer pipe so that the inner pipe is prevented from being damaged or damaged So that it is possible to stably support the inner tube.

However, the roller type flow member 40 shown in FIG. 2 has a disadvantage in that the roller 44 is firmly fixed to the inner tube at a height of a predetermined dimension, thus causing a serious problem on the bent portion of the pipe.

More specifically, the double pipe has a portion bent naturally at the time of piping from the supply source of the fluid, and since the piping route must be changed by various utility pipes, facilities, or structures constructed on the ground or underground, On the path, there are provided a plurality of bending connection portions provided with a fitting member of a double pipe structure commonly referred to as an elbow or a band.

In the bending connection portion, deformation and damage occur because the amount of deformation (an amount of increase in length) in the straight section is collected at the time of thermal expansion of the inner tube. That is, since the inner tube 10 is moved to the inner circumferential surface of the outer tube 30, the inner tube and the outer tube are adhered to each other and are damaged or repeatedly damaged by the deformation force. Particularly, when the roller type flow member 40 shown in FIG. 2 is installed on the inner pipe of the bending connection portion, the roller 44 protruding in a fixed manner according to the deformation of the inner pipe 10 presses the inner peripheral surface of the outer tube strongly The vacuum is broken in the space portion provided between the inner pipe and the outer pipe due to the repetitive deformation force, thereby deteriorating the adiabatic effect remarkably and the safety of the steam pipe passing through the hot steam is poor.

Due to such a problem, Korean Patent Registration No. 10-0656876 discloses a piping system for compensating for thermal expansion, which can improve the durability by preventing breakage of a connecting portion connecting two straight portions of a double pipe.

The piping system for compensating thermal expansion disclosed in Korean Patent Registration No. 10-0656876 includes an outer pipe 250 embedded in the ground as shown in FIG. 3, an inner pipe 220 provided inside the outer pipe 250, A rectilinear section 200 connected with a double insulated pipe including a roller 280 attached to the outer circumference of the inner pipe 220 and an anchor 290 for fixing the inner pipe 220, And a sealing device (130) for transporting high-temperature steam produced in a heat production facility to a heat-using area, wherein the piping system is located at a portion where the path of the straight line part (200) And an elbow inner pipe (314) directly connected to the elbow inner pipe (220). The elbow inner pipe (314) is installed inside the elbow inner pipe (314) and is slid by the inner pipe (220) (312) having a larger diameter than the outer tube (250) And an elbow 310 made of; Sliding means provided at both ends of the elbow inner tube (314) to assist both ends of the elbow inner tube (314) to move simultaneously; And a reducer 320 connecting the outer tube 250 and the elbow tube 312 having diameters different from each other.

The sliding means of the refracting portion 300 is provided at a position spaced apart from both ends of the elbow outer tube 312 by a predetermined distance and is attached to the inner peripheral edge of the elbow outer tube 312 in parallel with the ground surface, An inner tube supporting plate 340 for guiding the inner tube to slide on the upper surface thereof; A support body 332 surrounding the outer circumference of the elbow inner tube 314 so as not to be damaged by friction when the elbow inner tube 314 slides on the inner tube support plate 340 and the support body 332 And an inner tube supporter 330 having a support pedestal 336 attached to a lower portion thereof.

However, in the piping system for compensating thermal expansion shown in FIG. 3, a separate elbow 310 and a reducer 320 having a larger volume and weight than those of the double tube of a straight line section are required to be specially manufactured and installed. (330) must be additionally installed, which is not only complicated in structure but also has a disadvantage that the material cost and the construction cost are excessively increased and the air is expanded.

2 and 3 can compensate the longitudinal deformation of the inner tube to some extent, but the inner tube does not thermally expand and contract only in the longitudinal direction, but the circumferential direction The roller 44 of the roller-type flow member 40 shown in FIG. 2 presses the inner circumferential surface of the outer tube at the time of expansion of the inner tube. Therefore, if such an operation is repeated, Resulting in deformation of the inner tube. If the height of the roller 44 is not exactly made uniform so that the outer circumferential surface of the roller 44 is separated from the inner circumferential surface of the outer tube 30 during the contraction of the inner tube 10, There is a disadvantage that it adversely affects stability and durability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a method of efficiently supporting a longitudinal extension of an inner tube in a bending connection portion of the inner tube, And it is an object of the present invention to provide a dual tube having a deformation compensating device capable of shortening the air.

It is another object of the present invention to provide an internal pipe capable of compensating for expansion and contraction in the longitudinal direction of the inner pipe and compensating for expansion and contraction in the circumferential direction, thereby stably supporting the inner pipe and improving the durability and safety of the pipe And to provide a double tube having such a deformation compensating device.

In order to achieve the above object, a dual tube having a deformation compensating device according to the present invention comprises an inner tube disposed at the center, an outer tube arranged so as to provide a space between the inner tube and an inner tube provided around the inner tube, And a deformation compensating device for compensating for the shrinkage, wherein the deformation compensating device comprises: a supporting member installed in the inner tube; And a rolling member which is rotatably installed on the support member and rolls on the inner circumferential surface of the outer tube in a rolling motion, wherein the rolling member is provided to elastically support the rolling member, And is movable in a direction.

The support member may include a support body having a lift space for lifting and lowering the rolling member at a center thereof. The support body is perforated in the form of a long hole toward the outer surface of the support body, and a moving hole for guiding the up- have.

The moving member may further include a moving member which is inserted into the moving hole and moved up and down, and in which the rolling member is rotatably installed.

The shifting member may have a structure in which the rolling member is provided on the upper portion and the connecting rod is inserted into the moving hole in the lower portion. The pressing elastic member is constituted by a compression coil spring provided on the bottom of the shifting member .

In order to achieve the above object, a dual tube having a deformation compensating device according to the present invention comprises an inner tube disposed at the center, an outer tube arranged so as to provide a space between the inner tube and an inner tube provided around the inner tube, And a deformation compensating device for compensating for the shrinkage, wherein the deformation compensating device comprises: a supporting member installed in the inner tube; And a rolling member which is installed through the supporting member so as to be in rolling contact with the inner circumferential surface of the outer tube, wherein a lower end of the rolling member is rotatably connected to the supporting member, A tiltable member having a moving ball of a shape; And a pressing elastic member provided on the pivoting member to elastically support the rolling member.

In this case, it is preferable that a restoring elastic member is further provided to apply an elastic force to restore the first upright state in the forward and reverse directions while the tiltable member is standing upright. The moving member may further include a moving member which is inserted into the moving hole and moved up and down, and in which the rolling member is rotatably installed.

Meanwhile, the rolling member may be formed of a roller or a circular ball which is rotated with respect to a rotation axis inserted in the center, and the support member may be protruded and formed so as to be equally divided into a clamping member fastened to the outer circumferential surface of the inner pipe.

According to the double pipe having the deformation compensating device according to the present invention, since the rolling member is installed not only to roll but also to move up and down by the pressing elastic member, it is possible to compensate the longitudinal thermal deformation of the inner pipe, Can be compensated.

In addition, since the rolling member of the deformation compensating device can move up and down, it is possible to effectively compensate for the longitudinal expansion amount of the straight section of the pipe adjacent to each other at the bending connection portion of the double pipe. Thus, damage or breakage of the outer pipe or inner pipe can be prevented, It is not necessary to provide a separate compensating device having a large volume and a heavy weight at the bending connection portion as in the prior art, so that the construction of the piping can be simplified in a simple and simple manner, and the material cost and the construction cost can be reduced.

Particularly, the double pipe having the deformation compensating device according to the present invention can perform the angular motion according to the degree of deformation of the inner pipe as well as the vertically moving roll member of the deformation compensating device. Therefore, So that the construction quality and safety of the steam piping can be improved.

1 is a longitudinal sectional view showing a conventional double tube,
2 and 3 are views for explaining a dual tube having a conventional deformation compensating device,
4A to 4C are views for explaining a dual tube having a deformation compensation apparatus according to a first embodiment of the present invention, wherein FIG. 4A is a partially cutaway perspective view showing the overall structure, FIG. 4B is a perspective view And Fig. 4C is a sectional view showing the assembled state.
5A and 5B are views showing a modified example of the dual tube having the deformation compensation device according to the first embodiment of the present invention, wherein FIG. 5A is a principal part separated perspective view, FIG. 5B is a sectional view showing an assembled state,
6A and 6B are views showing a double tube having a deformation compensation device according to a second embodiment of the present invention, wherein FIG. 6A is a principal part separated perspective view, FIG. 6B is a sectional view showing an assembled state,
FIGS. 7A and 7B are views showing a double tube having a deformation compensation apparatus according to a third embodiment of the present invention, wherein FIG. 7A is a principal part separated perspective view, and FIG. 7B is a principal perspective view showing an assembled state.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 4A to 7B. In FIGS. 4A to 7B, the same elements are denoted by the same reference numerals. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

4A to 4C are views for explaining a dual tube having a deformation compensation apparatus according to a first embodiment of the present invention, FIG. 4A is a partially cutaway perspective view showing the overall structure, FIG. 4B is a cross- And Fig. 4C is a cross-sectional view showing the assembled state.

4A and 4B, a dual tube 1 having a deformation compensation device according to a first embodiment of the present invention includes an inner tube 11 disposed at the center and having a through hole 111 for fluid flow at its center, An outer tube 12 spaced apart from the inner tube 11 so as to provide a space 14 therebetween and a heat insulating layer 13 formed of a material having a superior thermal insulating property And a deformation compensating device 2 provided around the inner tube 11 and compensating for the expansion and contraction of the inner tube.

The deformation compensation apparatus 2 is provided with a plurality of support members 21 installed on an inner tube 11 and a rolling member 20 which is rotatably installed on the support member 22 and is in close contact with the inner circumferential surface of the outer tube 12, (23).

The support member 22 may be directly attached to the inner tube 11 by a welding method. However, in this embodiment, the support member 22 is integrally formed with the clamping member 21 provided on the outer peripheral surface of the inner tube 11 in the form of a band. The clamping member 21 is divided into two or three according to the diameter of the inner tube 11 as shown in FIG. 4A and is fastened to the clamping member 211 such as a fixing bolt, 21 is installed, the heat insulating layer 13 is cut.

On the other hand, the support member 22 is arranged to be divided equiangularly so that the inner tube 11 can be supported on the outer tube 12 at a uniform angle. The shape of the support member 22 is not limited as long as the rolling member and the pressing elastic member 24 described later can be easily installed. However, in the present embodiment, And the lifting and lowering space 222 is formed.

The rolling member 23 has a feature of rolling on the inner circumferential surface of the outer tube 12 so as to be capable of rolling and being vertically movable, and is formed in a ball shape so that the lifting and lowering space 222 is inserted and installed.

The deformation compensation apparatus 2 is characterized in that the rolling member 23 is configured to move (come and go) in accordance with the interval of the space portion 14 between the outer peripheral surface of the inner tube 11 and the inner peripheral surface of the outer tube 12 And a pressing elastic member 24 inserted and installed in the lifting and lowering space 222 of the support main body 221 to elastically support the rolling member 21 to enable such operation. At this time, the pressing elastic member 24 is composed of a compression coil spring.

5A and 5B are views showing a modified example of the dual tube having the deformation compensation device according to the first embodiment of the present invention, wherein FIG. 5A is a principal part separated perspective view, and FIG. 5B is a sectional view showing an assembled state.

5A and 5B, a dual tube having a deformation compensating apparatus according to a modification includes a plurality of support members 22 formed on a clamping member 21 provided on an inner tube 11, And a deformation compensating device 2 having a pressing member 24 and a rolling member 23. The supporting member 22 includes a support body 221 formed in a cylindrical shape and a moving hole 223 are formed on the support body 221. The support body 221 is further provided with a movable member 25 which is vertically movable.

The moving hole 223 is a pair of holes formed in both sides of the support main body 221 so as to be opposed to each other in the form of a long hole, and the connecting rod 26, which will be described later, is inserted and moved up and down.

The moving member 25 is inserted into the lifting and lowering space 222 of the support main body 221 so as to be positioned at the upper end of the pressing elastic member 24 so that the rolling member 23 is rotatably installed.

The moving member 25 includes a rolling member seating portion 251 on which a rolling member 23 is installed on an upper portion of a body having a substantially round bar shape and a support member 251 integrally formed on the lower portion of the rolling member seating portion 251, And a connection connecting portion 252 which is movably connected to the moving hole 223 of the member 22. At this time, a connecting rod 26 inserted into the moving hole 223 is coupled to the connecting connecting portion 252. The connecting rod 26 may be formed of two fastening pins (a thread is formed on the outer circumferential surface of the short round bar) which is fastened to both sides of the connection connecting portion 252. In this embodiment, And a nut 262 fastened to the fastening bolt 261. The fastening bolt 261 has a head portion 261b formed on the fastening bolt 261a.

The rolling member seating portion 251 is formed with a ball seating groove 251a which is recessed in an approximately hemispherical shape so that a lower portion of the ball constituted by the rolling member 23 is inserted and seated and a ball cap member 253, A fastening groove 251b is formed.

The connecting connection portion 252 has a structure in which a bar insertion hole 252a penetrating in the transverse direction is inserted to insert the connecting rod 26 inserted into the moving hole 223.

On the other hand, the deformation compensation apparatus 2 is provided with a ball cap member 253 for preventing the rolling member 23 from coming off. The ball cap member 253 is formed with a ball exposing hole 253a so as to expose a part of the upper part of the rolling member 23 at the center of a body having a substantially disk shape, And a fastening protrusion 253b formed with a female screw thread to be fastened to the fastening groove 251b of the fastening protrusion 251b. At this time, the ball exposing hole 253a is formed to have a corresponding radius of curvature for smooth rotation of the ball constituted by the rolling member 23.

Hereinafter, the operation of the dual tube having the deformation compensation device according to the first embodiment of the present invention will be briefly described.

First, the deformation compensating device 2 is provided between the outer peripheral surface of the inner tube 11 and the inner peripheral surface of the outer tube 12. [ The method of installing the deformation compensation device 2 is such that the supporting member 22 is equally welded around the clamping member 21 and the pressing elastic member 24 and the rolling member 22 are inserted into the lifting and lowering space 222 of the supporting member 22. [ And then the clamping member 21 is fastened and fixed to the outer peripheral surface of the inner tube 11 by using the fastening member 211. [ At this time, the deformation compensation apparatus 2 of the type shown in FIG. 5A is free from the risk of separation of the rolling member 23, but the deformation compensation apparatus 2 formed in the form shown in FIG. Care is taken to prevent the rolling member 23 from being detached, or the rolling member is weakly fixed by using an attachment means (not shown) such as a scotch tape or the like, and then the assembly process is performed.

When the double pipe 1 having the deformation compensating device 2 is completed through such an assembling process, the steam supply line is constructed according to the determined path and specifications and the air in the space portion 14 is supplied to a vacuum pump (not shown) Pulls out negative pressure. When the steam supply line is completed and steam is supplied through the inner pipe, the inner pipe 11 is thermally expanded and heat-shrunk in the longitudinal direction depending on whether steam is supplied. At this time, the rolling member 23 rides on the inner peripheral surface of the outer pipe 12 So that the inner tube 11 and the outer tube 12 are prevented from being damaged or damaged by performing a function of absorbing and compensating the load according to the longitudinal deformation force of the inner tube.

Since the rolling member 23 is provided so as to be movable up and down by the pressing elastic member 24, the deformation compensating device according to the present invention compensates the longitudinal thermal deformation of the inner tube 11, The deformation can be compensated. That is, when the inner tube 11 is thermally expanded in the circumferential direction (outer diameter direction), when the rolling member 23 is pressed and conversely the inner tube 11 is thermally contracted, the inner tube 11 is protruded onto the inner peripheral surface of the outer tube 12 by the elastic force of the pressing elastic member 24 So that the rolling member 23 always stably comes in close contact with the inner circumferential surface of the outer tube so that the rolling member 23 can always move in the rolling direction.

Particularly, the double pipe having the deformation compensating device according to the present invention has an advantage of solving the problem caused by the thermal expansion occurring in the bending connection portion such as the elbow (not shown) in the steam supply line. More specifically, since the amount of deformation (an amount of increase in length) of the straight section is collected at the time of thermal expansion of the inner tube 11, the bending connection part can be easily removed from the inner tube 11 or the heat insulating layer 13 are pressed against the outer tube 12 or the outer tube 12 is damaged due to the pressing force of the deformation compensating device 2 because the structure is such that the rolling member 23 is moved up and down, Since the rolling member 23 is moved inward when the space between the space portions 14 is narrowed, damage to the outer tube 12 can be prevented, the vacuum state of the space portion 14 can be stably maintained, It is possible to prevent problems such as leakage of steam, so that the safety and stability of the steam piping can be improved.

6A and 6B are views showing a double tube having a deformation compensation device according to a second embodiment of the present invention, wherein FIG. 6A is a principal part separated perspective view and FIG. 6B is a sectional view showing an assembled state. Explanations about the same components as those of the first embodiment are omitted because they are similar to those of the first embodiment.

6A and 6B, a dual tube 1 having a deformation compensation device according to a second embodiment of the present invention includes an inner tube 11, an outer tube 12, a heat insulating layer 13, The deformation compensating device 2 is provided with a plurality of support members 32 and a support member 32 formed on a clamping member 31 installed in the inner tube 11, And a moving member 35 and a pressing elastic member 34 for movably supporting the rolling member 33 on the supporting member 32 so that the rolling member 33 is rotated by the roller 33, .

The support member 32 includes a support body 321 in the form of a rectangular plate protruding from both edges of the clamping member 31 so as to provide a lifting space 322 at the center thereof, And a hole 323 in the form of a long hole to be drilled into the hole 323.

The rolling member 33 is formed by a roller 331 having a shaft insertion hole formed at the center of a body having a round rod shape, and a rotation shaft 332 is inserted into the shaft insertion hole.

The shifting member 35 is formed in a substantially rectangular plate shape and has a rotation axis insertion hole 351a in which the rotation axis 332 of the rolling member 33 is inserted and a rod insertion hole 351a in which a connecting rod 36 A pair of rolling member seating portions 351 on which the rolling member seating portions 351b and 351b are formed and a connection connecting portion 352 connected to a lower portion of the rolling member seating portion 351.

The connecting rod 36 may be formed by two fastening pins which are fastened to both sides of the rod insertion hole 351b. In this embodiment, however, the rod body 361a has a head portion 361b formed in the pin body 361a And includes a fastening bolt 361 and a nut 362 fastened to the fastening bolt.

FIGS. 7A and 7B are views showing a double tube having a deformation compensation apparatus according to a third embodiment of the present invention, wherein FIG. 7A is a principal part separated perspective view, and FIG. 7B is a principal perspective view showing an assembled state.

7A and 7B, a dual pipe 1 having a deformation compensation device according to a third embodiment of the present invention includes an inner pipe 11, an outer pipe 12, a heat insulating layer 13, (4) for compensating for expansion and contraction, wherein the deformation compensating device (4) is constructed so as to be capable of angular movement in a clockwise or counterclockwise direction at a bending connection such as an excessive deformation of the inner tube (11) The point is characterized. To this end, the deformation compensating device 4 has a rotating member 47 and a restoring elastic member 48 in addition to the supporting member 42, the rolling member 43, the pressing elastic member 44, and the moving member 45 Respectively.

The support member 42 includes a hinge pin insertion hole 421a into which a hinge pin 422 is inserted at an upper end of a pair of support bodies 421 protruding in the form of a rectangular plate facing opposite edge portions of the clamping member 41 And is formed into a perforated structure.

The pivoting member 47 includes a pivoting body 471 rotatably connected to the support member 42 via a hinge pin 422 at the lower end thereof, a vertically movable space 472 formed at the center thereof, And a movable hole 473 in the form of a long hole is formed so as to be movable up and down.

The rolling member 43 is formed by a roller 431 having a shaft insertion hole formed at the center of a body having a round rod shape and a rotary shaft 432 inserted into the shaft insertion hole. And is inserted into and fixed to the moving hole 473 of the member 47.

The pressurizing elastic member 44 is constituted by a compression coil spring and is inserted into the lifting and lowering space 472 of the pivoting member 47 so as to elastically support the rolling member 43.

The moving member 45 is formed in a structure similar to the moving member 35 of the second embodiment described above and is formed in a substantially rectangular plate shape and is arranged to face the rotating shaft 432 in which the rotating shaft 432 of the rolling member 43 is inserted. A pair of rolling member seating portions 451 formed with a rod insertion hole 451b into which a hole 451a and a connecting rod 46 are inserted and a connection connecting portion 452 connected to a lower portion of the rolling member seating portion 451, .

The restoring elastic member 48 is configured to apply an elastic force to the pivoting member for restoring the pivoting member 47 to the initial state in which the pivoting member 47 is rotated in the normal and reverse directions (clockwise and counterclockwise) A first restoring elastic member 481 for applying an elastic force in a counterclockwise direction which is counterclockwise in a clockwise direction and a second restoring elastic member 481 for applying an elastic force in a clockwise direction opposite to the counterclockwise rotation of the pivoting member 47 482).

The first and second restoring elastic members 481 and 482 may be various elastic members such as a leaf spring if they can provide a restoring force, but in the present embodiment, they are generally composed of springs called torsion springs. The first restoring elastic member 481 is provided with a coil body 481a on the hinge pin 422 so as to apply an elastic force for restoring in a counterclockwise direction opposite to the rotating direction of the pivoting member 47 in the clockwise direction And the one distal end portion 481b is hooked on one side of the pivoting member 48 and the other distal end portion 481c is hooked on one side of the supporting member 42 (one supporting body 421). The second restoring elastic member 482 is inserted into the hinge pin 422 such that the coil body 482a is inserted into the second restoring elastic member 482 so as to apply an elastic force for restoring the reverse direction when the pivoting member 47 rotates in the counterclockwise direction, 482b are hooked on the other side of the pivoting member 48 and the other distal end portion 482c is hooked on the other side of the support member 42 (the other support main body 421).

Hereinafter, the function and effect of the dual tube having the deformation compensation device according to the third embodiment of the present invention will be briefly described.

When the steam supply line is constructed using the dual pipe 1 having the deformation compensating device according to the third embodiment shown in Figs. 7A and 7B, the rolling member 43, as in the operation description of the first embodiment described above, Since it rolls on the inner peripheral surface of the outer tube 12, it absorbs and compensates for the longitudinal strain force of the inner tube. At the same time, since the rolling member 43 is provided so as to be movable up and down by the pressing elastic member 44, it is possible to compensate the longitudinal thermal deformation of the inner pipe 11 and to compensate the circumferential thermal deformation of the inner pipe 11 have.

Particularly, in the third embodiment, the double pipe 1 having the deformation compensating device is configured such that when the deformation compensating device 4 is disposed in the bending connection portion such as the elbow, the inner pipe is excessively deformed, Since the member 47 is rotatably coupled to the support member 42, angular movement can be performed in a clockwise or counterclockwise direction.

The rolling member 43 including the tilting member 47 is rotated so that the load applied to the outer tube 12 is reduced even when the gap of the space portion 14 is narrowed within the bending connection portion due to the excessive deformation of the inner tube 11. [ Can be minimized, so that damage to the appearance can be prevented. As a result, the vacuum state of the space portion 14 can be more stably maintained, and damage to the inner tube 11 due to overload can be prevented.

It is to be understood that the present invention is not limited to the above-described embodiment, and that various modifications may be made without departing from the scope of the present invention It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Double pipe 11: Inner pipe
12: Appearance 13: Insulating layer
14: space part 2.3, 4: deformation compensation device
21, 31, 41: clamping member 22, 32, 42:
221, 321, 421: Support body 222, 322, 427:
23, 33, 43: rolling member 24, 34, 44: pressing elastic member
25, 35, 45: Movable members 251, 351, 451:
252, 352, 452: connection connection 253, 323, 473:
26, 36, 46: connecting rod 47:
471: rotating body 48: restoring elastic member
481: first restoring elastic member 482: second restoring elastic member

Claims (8)

And a deformation compensating device provided around the inner tube and compensating for the expansion and contraction of the inner tube, wherein the inner tube has an inner tube disposed at the center, an outer tube arranged so as to provide a space between the inner tube and the inner tube,
Wherein the deformation compensation apparatus comprises:
A support member installed in the inner tube; And
And a rolling member rotatably installed on the support member and being in close contact with the inner circumferential surface of the exterior to move the cloud.
And a pressurized elastic member installed to elastically support the rolling member, wherein the rolling member is installed to be movable in the vertical direction. The method of claim 1,
The support member is composed of a support body provided with a lifting space for the lifting of the cloud member in the center, the support body is perforated in the form of a long hole toward the exterior, characterized in that the movement hole for guiding the shangdong of the cloud member is formed; Double pipe with strain compensation device. 3. The method of claim 2,
Further comprising a moving member which is inserted into the moving hole and moves up and down, and in which the rolling member is rotatably installed. The method of claim 3,
Wherein the moving member has a structure in which the rolling member is installed on the upper portion and the connecting rod is inserted into the moving hole in the lower portion,
Wherein the pressing elastic member is composed of a compression coil spring provided on a bottom portion of the moving member. And a deformation compensating device provided around the inner tube and compensating for the expansion and contraction of the inner tube, wherein the inner tube has an inner tube disposed at the center, an outer tube arranged so as to provide a space between the inner tube and the inner tube,
Wherein the deformation compensation apparatus comprises:
A support member installed in the inner tube; And
And a rolling member installed on the inner circumferential surface of the outer tube so as to be in close contact with the inner circumferential surface of the outer tube,
A pivoting member having a lower end rotatably connected to the supporting member and having a moving hole in the form of a slot so that the rolling member is vertically movable; And
And a pressing elastic member provided on the pivoting member to elastically support the rolling member. 6. The method of claim 5,
And a restoring elastic member provided to apply an elastic force for returning to a first upright state in the forward and reverse directions while the tiltable member is standing upright. The method according to claim 6,
Further comprising a moving member which is inserted into the moving hole and moves up and down, and in which the rolling member is rotatably installed. 8. The method according to any one of claims 1 to 7,
Wherein the rolling member is constituted by a roller or a circular ball which is rotated with respect to a rotational shaft inserted in the center,
Wherein the support member is protruded and formed so as to be equally divided into a clamping member fastened to an outer circumferential surface of the inner tube.

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