KR20200092248A - An expansion joint of double insulator pipe - Google Patents

Abstract

The present invention relates to an expansion joint device for heat-insulated double pipes. According to the present invention, the expansion joint device for heat-insulated double pipes comprises: a body; a fluid transfer pipe consisting of a connection part and a pipe expansion part; a sliding pipe; and a fixing anchor installed in the body and fixing the fluid transfer pipe to the body. According to the present invention, the work productivity can be maximized by shortening construction time.

Description

An expansion joint of double insulator pipe

The present invention relates to a telescopic joint device for an insulated double pipe, and more particularly, to a telescopic joint device for an insulated double pipe that maximizes work productivity through increased construction convenience and reduced manpower.

In general, hot fluid such as hot water or steam produced from facilities such as a cogeneration plant and an integrated energy management facility is supplied to a user through a pipe.

The pipe through which the high-temperature fluid is transferred is configured to be supplied through an adiabatic double pipe to minimize energy loss during transportation, and the adiabatic double pipe is composed of an inner pipe through which the fluid flows and an exterior spaced apart from the inner pipe.

Between the inner tube and the outer tube, an insulating material is filled to minimize heat loss of the fluid being transported through the inner tube.

On the other hand, due to changes in the external temperature and the temperature of the fluid being transported, the heat-insulated double pipe is stretched, and when deformation occurs in the heat-insulated double pipe due to twisting or the like due to expansion and contraction, the fluid is cracked due to stress concentration. Leaking accidents may occur.

Accordingly, in the case of installation of underground pipes using heat-insulated double pipes, expansion joints must be installed on the connecting parts of the pipes, which may be caused by expansion, contraction, or distortion caused by ground subsidence due to temperature changes or earthquakes in the transport fluid. Protects piping by absorbing excessive stress.

Hereinafter, with reference to the accompanying Figure 1 to look briefly about the construction of the heat insulation double pipe according to the prior art.

1 is a view schematically showing a state in which a heat-insulated double pipe according to the prior art is buried, an anchor 10 for fixing and supporting the heat-insulated double pipe is installed, and the heat-insulated double pipe 20 is disposed between the anchors 10. It is constructed.

At this time, between the insulating double pipe 20 and the anchor 10, a telescopic joint device 30 is installed, and the telescopic joint device 30 provides a telescopic action according to the temperature of the thermally insulating double pipe through which high-temperature fluid flows.

As such, due to the installation of the expansion and contraction device 30, it is possible to flexibly cope with the temperature change during expansion and contraction due to the temperature change of the heat insulation double pipe 20, and also to flexibly cope with external pressure changes such as earthquakes. It is possible to prevent fluid leakage due to the insulation double pipe 20 being damaged.

However, the above-described construction of the conventional heat-insulated double pipe 20 and the expansion joint 30 has the following problems.

The expansion joint device 30 and the anchor 10 should be provided respectively, and the construction also caused inconvenience.

That is, since the construction of the anchor 10 and the construction of the expansion and contraction device 30 are performed, the convenience of construction is poor.

In addition, since there are many welding points between the anchor 10 and the heat-insulated double pipe 20, it is difficult to shorten the construction period due to the increased number of man-hours, so there is a problem in that work productivity is deteriorated.

In particular, since there are many welding point sections, there is a problem in that the work convenience in the narrow space in the ground is poor.

Republic of Korea Registration No. 10-1741621

The present invention has been devised to solve the above-mentioned problems, and the object of the present invention is to allow the expansion and contraction to be performed while sliding in the direction of thermal expansion of the inner tube, and an anchor that induces the direction of thermal expansion is provided integrally, thereby providing convenience in construction. And to provide a flexible joint device for an insulated double pipe that maximizes work productivity.

In order to achieve the above object, the present invention is provided between a plurality of heat-insulated double pipes including an inner tube that provides a conduit through which a fluid is transferred between a supply source and a demand and an outer tube surrounding the inner tube, and the heat of the heat-insulated double pipe that is installed between the heat insulating double tubes. What is claimed is: 1. An expansion and contraction device for an insulation double pipe performing expansion and contraction according to an expansion, comprising: a body connected between the exteriors of the insulation double pipes and corresponding to the diameter of the exterior; A fluid transfer pipe consisting of a connecting portion connected to an inner pipe installed on one side of the body, and an expanding portion disposed inside the body and expanded from the connecting portion; A sliding tube which is connected to an inner tube installed on the other side of the body and is located inside the expanding tube portion and is slid in the expanding tube portion in a direction of thermal expansion of the inner tube; It is installed on the body, and includes a fixed anchor for fixing the fluid transport pipe to the body, wherein the fixed anchor surrounds the periphery of the fluid transport pipe, and the connection mediation arranged in a plurality in the longitudinal direction of the fluid transport pipe; One end is fixed to the fluid transfer pipe, the other end is a rib fixed to each of the outer surface of the connection parameter ring disposed on the outermost of the connection parameter ring; A fixing ring interposed between the connection mediating rings and fixed to the body; It provides an expansion and contraction device for a heat insulation double pipe, characterized in that it comprises a fastening means for fastening the connecting medium ring and the fixing ring.

At this time, it is preferable that a gasket ring is further interposed between the connection mediating ring and the fixing ring to suppress heat from the fluid transfer pipe from being transferred to the body.

In addition, the body is dividedly configured on both sides based on the fixing ring, and the fixing ring is formed to have a larger diameter than the connection mediating ring and the gasketing ring, and is fixed by being exposed outside the body through the divided portion of the body. It is desirable.

In addition, the fixing anchor is preferably configured to fix the expansion portion inside the body.

The expansion joint device of the heat insulation double pipe according to the present invention has the following effects.

First, when manufacturing an expansion joint of an insulated double pipe, an anchor is provided inside the expansion joint to manufacture the expansion joint and the anchor in one body, so it is not necessary to separately provide an expansion joint and an anchor at the construction site. This simplifies and has the effect of increasing convenience.

Second, since it can serve as an anchor function only with a telescopic joint, there is an effect that can simplify the design of a double insulation pipe construction.

Third, since the welding point for anchor construction can be omitted, there is an effect to increase the convenience of heat insulation double pipe construction according to the reduction in welding work.

Fourth, it is possible to shorten the construction period by reducing the number of labors due to the reduction in welding work, thereby maximizing work productivity.

Fifth, since the welding work section in the ground can be reduced, there is an effect that can increase the convenience for the construction of a heat-insulated double pipe underground.

1 is a view schematically showing a state in which the expansion and contraction device of the heat insulating double pipe according to the prior art is separately installed from the fixed anchor.
Figure 2 is a side cross-sectional view showing the expansion and contraction of the heat insulation double pipe according to a preferred embodiment of the present invention.
3 is an exploded perspective view showing the fixed anchor to help understand the fixed anchor of the expansion and contraction device of the insulating double pipe according to the preferred embodiment of the present invention.
4 is a perspective view showing a fixed anchor to help understand the fixed anchor of the expansion and contraction device of the heat insulating double pipe according to the preferred embodiment of the present invention.
5 is a perspective view showing a fixed anchor is fixed to the body to help understand the fixed anchor of the expansion and contraction device of the insulating double pipe according to the preferred embodiment of the present invention.
6 is a cross-sectional view showing a state in which the expansion and contraction device of the heat insulation double pipe according to a preferred embodiment of the present invention.
7 is a cross-sectional view showing a state in which the expansion and contraction device of the heat insulation double pipe according to a preferred embodiment of the present invention is expanded in the direction of thermal expansion.

The terms or words used in the specification and claims are not to be construed as being limited to ordinary or lexical meanings, and the inventor is based on the principle that the concept of terms can be properly defined in order to best describe his or her invention. It should be interpreted in a sense and concept consistent with the technical idea of the present invention.

Hereinafter, with reference to the accompanying Figures 2 to 7 will be described with respect to the expansion and contraction device of the heat insulation double pipe according to a preferred embodiment of the present invention (hereinafter referred to as'extension joint device').

The expansion joint allows the thermal expansion of the inner pipe through which the fluid flows to be made by sliding, and the technical anchor is provided with a fixed anchor that guides the expansion direction of the inner pipe during expansion and contraction due to the thermal expansion of the inner pipe as one body inside the expansion joint. There are features.

2, the expansion joint device 100 includes a body 110, a fluid transfer pipe 120, a sliding pipe 130, a fixed anchor 140, and an airtight holding means 150, as shown in FIG. do.

The body 110 constitutes the external appearance of the expansion and contraction device, and corresponds to the external appearance 21 constituting the heat insulation double pipe 20.

That is, the body 110 is connected between the exterior 21 of the plurality of heat-insulating double pipes 20 that are buried in the ground, and the diameter of the body 110 corresponds to the exterior 21 of the heat-insulating double pipes 20. . The body 110 is dividedly configured as shown in FIG. 3 for coupling with a fixed anchor 140, which will be described later.

Next, the fluid transfer pipe 120 provides a pipeline through which high-temperature fluid flows, and is connected to an adiabatic double pipe 20 installed on one side of the body 110.

Precisely, as shown in Figure 6, the expansion and contraction joints 100 are sandwiched between the expansion and contraction joints 100 on both sides of the expansion joints 20, the fluid transfer pipe 120 is the expansion joint 100 It is to be connected to the inner tube 22 of the heat insulation double pipe 20 installed on one side of.

At this time, the one side of the expansion joint device 100 refers to the left side of the drawing (FIGS. 2 and 6 ).

The fluid transfer pipe 120 is composed of a connecting portion 121 connected to the inner pipe 22 and an expansion pipe 122 into which a sliding pipe 130 to be described later is inserted.

The connecting portion 121 constitutes one end of the fluid transfer pipe 120 and is a portion integrally connected to the inner pipe 22.

The connection portion 121 may be fixed through the inner tube 22 and welding.

The expansion tube 122 constitutes the other end of the fluid transfer tube 120, and is a portion into which the sliding tube 130 is inserted.

The expansion tube 122 is formed to have an inner diameter larger than the outer diameter of the sliding tube 130, and the sliding tube 130 may be reciprocated straight in the expansion tube 122.

Next, the sliding pipe 130 is configured to interlock with expansion and contraction due to thermal expansion of the inner pipe 22 when a temperature change occurs in the inner pipe 22 through which high-temperature fluid flows, sliding inside the fluid transfer pipe 120 This is the configuration.

The sliding pipe 130 is disposed in the expansion pipe 122 of the fluid transfer 120 pipe and is connected to the inner pipe 22 of the heat insulation double pipe 20 installed on the other side of the body 110.

The sliding pipe 130 may also be connected to the inner pipe 22 through welding.

Due to the configuration of the sliding tube 130, when the inner tube 22 through which the fluid flows expands, the length of the inner tube 22 according to the expansion is extended, and the sliding tube interlocked with the length extension of the inner tube 22 130 is moved in the direction of thermal expansion within the expansion portion (122).

As the sliding pipe 130 moves in the thermal expansion direction of the inner pipe 22, the stress of the inner pipe 22 due to thermal expansion can be relieved, so that the inner pipe 22 of the heat insulation double pipe 20 is twisted or Breaking does not happen.

Next, the fixed anchor 140 is configured to induce a direction of thermal expansion of the inner tube 22, and to be a fixed point during expansion and contraction due to thermal expansion of the inner tube 22.

The fixed anchor 140 is composed of a telescopic joint device 100 and one body, and fixes the fluid transfer pipe 120 inside the body 110 as shown in FIG. 2.

As the fixed anchor 140 fixes the fluid transfer tube 120 inside the body 110, the direction of thermal expansion of the inner tube 22 around the fixed anchor 140 maintains one direction.

The fixed anchor 140 is preferably to fix the expansion portion of the fluid transfer pipe 120 inside the body 110.

In this way, since the fixed anchor 140 is configured inside the body 110, the expansion and contraction of the inner tube 22 can be performed only by the expansion and contraction device 100, and it also serves as a fixed point for inducing the direction of thermal expansion. It becomes possible.

The fixed anchor 140 may be any configuration that can fix the fluid transfer pipe 120 inside the body 110, and it is preferable to fix the fluid transfer pipe 120 inside the body 110 through welding.

As the expansion pipe 122 side of the fluid transfer pipe 120 is fixed as described above, the direction of thermal expansion is directed to the opposite side of the fixed anchor 140.

The fixed anchor 140 will be described in detail with reference to FIGS. 3 to 5. The fixed anchor 140, as shown in Figures 3 and 5, the connection parameter ring 141, the rib 142, the fixed ring 143, the gasket ring 144, and the fastening means 145 And, includes a finishing ring (146).

The connection parameter ring 141 serves to connect the ribs 142 and the fixing ring 143, and is preferably formed of a ring that can wrap the fluid transfer pipe 120. The connection mediating ring 141 is preferably provided in plural in the longitudinal direction of the fluid transfer pipe 120, and the number is not limited, but is preferably provided in two. A plurality of fastening holes 141a are formed around the connection mediating ring 141. The inner diameter of the connection parameter ring 141 is formed larger than the outer diameter of the fluid transfer pipe 120. Accordingly, as shown in FIG. 2, a clearance occurs between the connection mediating ring 141 and the fluid transfer pipe 120.

The rib 142 is fixed between the fluid transfer pipe 120 and the connection parameter ring 141, and is provided to fix the fluid transfer pipe 120 to the body 110. One end of the rib 142 is fixed to the fluid transfer pipe 120 through welding, and the other end of the rib 142 is fixed to the connection parameter ring 141 through welding. The ribs 142 are fixed to each connection parameterization ring 141, and as described above, the connection parameterization ring 141 is provided in two bars, and the ribs 142 are also fixed to the connection parameterization rings 141 on both sides. do. In addition, the ribs 142 may also serve to increase the rigidity of the fluid transfer pipe 120.

The fixing ring 143 serves to fix the connection media ring 141 welded to the rib 142 to the body 110. One side of the fixing ring 143 is interposed on the other side of the connection medium ring 141, the other side of the fixing ring 143 can be fixed to the body 110, thereby fixing the fluid transfer pipe 120 to the body 110. The inner diameter of the fixing ring 143 is formed larger than the outer diameter of the fluid transfer pipe 120. The diameter of the fixing ring 143 is formed larger than the diameter of the connecting medium ring 141, it is preferable that it is formed larger than the diameter of the body 110. By such a configuration, the edge of the fixing ring 143 is exposed outside the connecting portion of the divided body 110, and the exposed portion of the fixing ring 143 is fixed to the body 110. Although only the edge of the fixing ring 143 may be fixed to the connecting portion of the divided body 110, in order to increase the area of the fixing portion, the edge of the fixing ring 143 is the body 110 as shown in FIG. It is preferable that it is formed to protrude outward. A plurality of fastening holes 143a are also formed around the fixing ring 143, and the fastening holes 143a are formed to correspond to the fastening holes 141a of the connection medium ring 141.

The gasketing 144 serves to inhibit heat from the fluid transfer pipe 120 from being transferred to the body 110. High-temperature fluid is transferred to the pipeline of the fluid transfer pipe 120, and the gasket ring 144 uses high-temperature heat generated from the high-temperature fluid through the ribs 142 and the connection parameter ring 141 and the fixing ring 143. It is provided to suppress the transmission to the body 110. The body 110 is made of PE coating, and this coating holding force can withstand heat of approximately 40° C. to 60° C. When considering the temperature of the fluid flowing through the fluid transfer tube 120 is approximately 200° C. to 400° C. It is very important not to transfer the heat of the fluid transfer pipe 120 through the body 144 to the body 110. The gasket ring 144 is interposed between the connection mediation ring 141 and the fixing ring 143, and the inner diameter of the gasket ring 144 is also formed larger than the outer diameter of the fluid transfer pipe 120. The gasket ring 144 is also formed with a fastening hole 144a corresponding to the fastening holes 141a and 143a of the connection medium ring 141 and the fixing ring 143.

The fastening means 145 serves to fasten the connection medium ring 141, the gasket ring 144, and the fixing ring 143, and is preferably provided with bolts and nuts.

The closing ring 146 is configured to be fixed to the fixing anchor 140 to the body 110 by being welded to the edge of the fixing ring 143 exposed outside the body 110 and the outer circumferential surface of the body 110. When the closing ring 146 constituting one side of the fixed anchor 140 is fixed to the body 110, since the rib 142 constituting the other side of the fixed anchor 140 is fixed to the fluid transfer pipe 120, the fluid is The pipe 120 is the same as being fixed to the body 110.

On the other hand, the inner diameter of each of the connection mediating ring 141, the fixing ring 143, and the gasket ring 144 is formed larger than the outer diameter of the fluid transport pipe 120, which causes a clearance with the fluid transport pipe 120. Order. As such, by generating a gap, the gap can form an air layer to minimize heat loss from the fluid transfer pipe 120.

The fixed anchor 140 configured as described above can further strengthen the fixing force of the fluid transfer pipe 120 with respect to the body 110, and can effectively perform a fastening operation inside the body 110 according to the divided configuration. .

Next, the airtight maintenance means 150 serves to maintain airtightness between the sliding pipe 130 and the fluid transfer pipe 120, and between the sliding pipe 130 and the expansion portion 122 of the fluid transfer pipe 120. Is installed.

The airtight holding means 150 is installed on the other side of the fluid transfer pipe 120, it is preferable that it consists of a tube body having an inner diameter corresponding to the outer diameter of the sliding pipe (130).

At this time, a sealing member 151 is installed on the inner circumferential surface of the airtight holding means 150, and the sealing member 151 is in close contact with the outer circumferential surface of the sliding tube 130, but does not interfere with the movement of the sliding tube 130.

Hereinafter, with reference to the attached Figures 3 and 4 for the construction of the heat insulation double pipe is installed expansion and contraction device having the above-described configuration will be described.

3 is a state in which the adiabatic double pipe 20 and the expansion and contraction device 100 are buried in the ground, and are constructed between the fluid supply source and the fluid demand destination.

In the present specification, for convenience of description, the right side in the drawing is referred to as a fluid supply destination and the left side in the drawing is referred to as a fluid demand destination.

As shown in FIG. 3, a plurality of heat insulating double pipes 20 are disposed along the fluid transfer pipe line, and a telescopic joint device 100 is installed between the heat insulating double pipes 20.

At this time, the inner pipe 22 is connected to the connecting portion 121 and the sliding pipe 130 of the telescopic joint device 100 through welding, respectively.

At this time, since the installation of the expansion and contraction device 100 is also provided with a fixed anchor 140 for providing a fixed point in the direction of thermal expansion of the inner tube 22 by simply installing the expansion joint 100, it is possible to increase the convenience of construction.

In addition, since the welding point with the inner tube 22 can also be minimized, the construction period can be shortened, and the number of man-hours can be reduced, thereby improving work convenience.

As described above, the construction of the heat insulation double pipe 20 and the expansion joint 100 is completed, and the high temperature fluid is transferred from the fluid supply source to the fluid demand destination.

At this time, since the fluid is at a high temperature below 150°C to 200°C, the inner tube 22 through which the fluid flows expands.

As shown in FIG. 3, thermal expansion of the inner tube 22 is performed according to the temperature of the inner tube 22 through which the fluid flows, and the sliding tube 130 connected to the inner tube 22 has a fluid transfer tube as shown in FIG. 4. It moves from the expansion part 122 of (120).

At this time, since the fixed anchor 140 fixes the fluid transfer pipe 120 inside the body 110 of the telescopic joint device 100, the fixed point becomes the interior of the telescopic joint device 100.

Thereafter, the fluid is continuously transported along the inner tube 22, and when the temperature falls due to a temperature change of the fluid itself or a factor according to the temperature change of the inner tube 22, the inner tube 22 contracts.

At this time, due to the contraction of the inner tube 22, the sliding tube 130 moves to the right in the drawing.

That is, according to the temperature change of the inner tube 22, as shown in FIGS. 3 and 4, the stretching action of the inner tube 22 is interlocked with the sliding action of the sliding tube 130.

Thereafter, as the inner tube 22 expands and contracts as described above, even if a temperature change occurs in the inner tube 22, damage to the inner tube due to stress generation can be prevented.

As described so far, the expansion joint device 100 of the heat insulating double pipe according to the present invention is made of a sliding method when the inner pipe 22 expands and contracts due to thermal expansion, but is a fixed anchor that is a fixed point for the inner pipe 22 to expand and contract. (140) was provided inside the expansion joint device (100).

Since the fixed anchor 140 and the telescopic joint device 100 are composed of one body, it is possible to increase the convenience of construction and shorten the construction period to increase work productivity.

In the above, the present invention has been described in detail with respect to the described embodiments, but it is obvious to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and it is natural that such modifications and modifications belong to the appended claims.

100: expansion joint 110: body
120: fluid transfer pipe 121: connection
122: expansion tube 130: sliding tube
140: fixed anchor 141: connection parameter ring
141a, 143a, 144a: fastener 142: rib
143: fixing ring 144: gasket ring
145: fastening means 146: finishing ring
150: airtight means 151: sealing member
20: insulation double pipe 21: appearance
22: inner tube

Claims (4)

A plurality of heat-insulating double pipes including an inner pipe that provides a pipe through which the fluid is transferred between the supply and the demand and an outer body surrounding the inner pipe, and an insulating double pipe that is installed between the insulating double pipes and performs a stretching operation according to the thermal expansion of the insulating double pipes. In the expansion joint device,
A body connected between the exteriors of the heat insulation double pipes and corresponding to the diameters of the exteriors;
A fluid transfer pipe consisting of a connecting portion connected to an inner pipe installed on one side of the body, and an expanding portion disposed inside the body and expanded from the connecting portion;
A sliding tube which is connected to an inner tube installed on the other side of the body and is located inside the expanding tube portion and is slid in the expanding tube portion in a direction of thermal expansion of the inner tube;
It is installed on the body, and includes a fixed anchor: for fixing the fluid transfer pipe to the body,
The fixed anchor,
A connection parameter ring surrounding the periphery of the fluid transfer pipe and arranged in plural in the longitudinal direction of the fluid transfer pipe;
One end is fixed to the fluid transfer pipe, the other end is a rib fixed to each of the outer surface of the connection parameter ring disposed on the outermost of the connection parameter ring;
A fixing ring interposed between the connection parameter rings and fixed to the body;
Stretching joint device of an insulating double pipe, characterized in that it comprises a fastening means for fastening the connection medium ring and the fixing ring. According to claim 1,
A gasket ring is further interposed between the connection mediating ring and the fixing ring, and the expansion joint device of the insulating double pipe is characterized in that heat from the fluid transfer pipe is suppressed from being transferred to the body. The method according to claim 1 or 2,
The body is dividedly configured on both sides based on the fixing ring, and the fixing ring is formed to have a larger diameter than the connection mediating ring and the gasketing ring, so that the body is exposed and fixed through the divided portion of the body. Characterized by expansion and contraction of insulation double pipe. The method according to claim 1 or 2,
The fixed anchor,
The expansion and contraction device of the heat insulation double pipe, characterized in that it consists of fixing the expansion pipe inside the body.

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