JPH10220641A - Laying jig for heat pipe for cooling cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig for laying heat pipes for cooling a cable which has good cooling performance for the cable and can simplify the laying work of heat pipes. SOLUTION: This device has holding members 5, 7 that are provided on predetermined positions in the direction of length of heat pipes 8 disposed on the outer peripheral side of a cable 2 arranged in a pipeline 1 and that hold the heat pipes 8, and rollers 6 that support the holding members 5, 7 and the heat pipes 8 in a state in which the holding members 5, 7 and the heat pipes 8 are separated from the outside surface of the cable 2 and that are put into contact with the outer surface of the cable 2 and are rolled thereby to move the holding members 5, 7 in the direction of length of the cable 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable cooling device using a heat pipe, and more particularly to a jig used when laying a heat pipe inside a pipeline.

[0002]

2. Description of the Related Art As a method of laying a power cable underground, there is known a pipe laying method in which a pipe material such as an FRP pipe or a fume pipe is buried in the ground and a cable is laid along the inside thereof. . In this type of laying method, the inside of the pipeline becomes high temperature due to heat generated from the cable, and there is a possibility that insulation failure or the like may occur as it is. Therefore, conventionally, a heat pipe which is excellent in heat transport capacity and free of maintenance is employed as a cooling means.

[0003] As an example, a configuration is known in which a heat pipe is laid directly inside a pipe in which a cable to be cooled is accommodated. There is also known a configuration in which an empty pipeline separately prepared is buried near a pipeline accommodating a cable, and a heat pipe is laid in the pipeline. According to these structures, when the cable generates heat, the heat evaporates the working fluid of the heat pipe, and the working fluid flows toward the other end where both the temperature and the pressure are low, where the heat is taken away and condensed. I do. The condensed working fluid returns to the evaporating section, where it is heated and evaporated again by the heat of the cable. Thereafter, the same cycle is continued, and as a result, overheating of the cable can be prevented.

[0004]

When laying a heat pipe in a gap in an existing pipeline, the heat pipe is inserted from the open end of the pipeline, and the end of the heat pipe reaches a desired position. The heat pipe is housed in the pipeline by sending out the heat pipe.

However, in the above-mentioned operation, since the heat pipe is simply drawn into the conduit, the heat pipe, which is a long object, is similarly extended on the outer surface of the cable, which is also a long object, and the inner wall surface of the conduit. Inefficient work, such as rubbing over distances, is required. That is,
When laying a heat pipe in an existing pipeline, there is an inconvenience that it is difficult to lay a heat pipe.

On the other hand, in the case where the pipe containing the heat pipe is buried in the vicinity of the cable, the work of laying the heat pipe can be performed relatively easily. In addition to increasing the distance to a certain heat pipe, the heat transfer between the two is conducted through the air and soil between the pipe and the heat pipe and the walls of the two pipes, so the cable The heat resistance between the heat pipe and the heat pipe increases. For this reason, this configuration has a disadvantage that the cooling capacity for the cable is inferior.

The present invention has been made in view of the above circumstances, and provides a jig for laying a heat pipe for cooling a cable, which has an excellent cooling ability for a cable and can easily perform the work of laying a heat pipe. It is intended for.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a heat pipe disposed at an outer peripheral side of a cable laid inside a pipeline in a predetermined position in a longitudinal direction of the heat pipe. A holder for holding the heat pipe attached to the cable, supporting the holder and the heat pipe in a state where the holder and the heat pipe are separated from the outer surface of the cable, and contacting the outer surface of the cable for rolling. And a roller for moving the holding tool in the longitudinal direction of the cable by moving the holding tool.

Therefore, according to the present invention, first, the holder is attached to the cable with each roller in contact with the outer surface of the cable. This operation is performed at a place such as an open end of a pipeline. Then, the holder holding the heat pipe is sent out a predetermined distance along the length direction of the cable. In this case, since the rollers roll on the outer surface of the cable to guide the holder, the heat pipe can be smoothly moved on the outer surface of the cable. Thus, the heat pipe is laid in the vicinity of the outer peripheral side of the cable along the length direction thereof.

[0010] As described above, in addition to the cable and the heat pipe being laid in the same conduit, the cable and the heat pipe are arranged close to each other, and the heat resistance between the two is small. Ability increases.

[0011]

Next, one embodiment of the present invention will be described with reference to FIGS. As an example, a cable 2 is laid inside a pipe 1 made of a pipe material having a circular cross section such as an FRP pipe or a fume pipe. As an example, the cable 2 is a power cable having a known configuration in which the outer peripheral portion of the conductor 3 is covered with a semiconductive cloth tape or braid (both not shown), a sheath 4 made of PVC, and the like. In addition, pipeline 1
Is buried underground substantially parallel to the ground surface (not shown).

On the other hand, reference numeral 5 indicates a base. The base 5 is formed of a metal plate having a predetermined width in the length direction of the cable 2 and has a substantially semicircular shape slightly larger than the outer diameter of the cable 2. Also, three rollers 6 are attached to the left and right sides and the upper part of the base 5 in FIG. 1 so as to rotate around an axis along the tangential direction of the base 5. That is, each of these rollers 6 is configured to rotate in contact with the outer surface of the sheath 4 of the cable 2 and to guide in the longitudinal direction.

On the other hand, a support member 7 is attached to the outer surface of the base 5, that is, the surface not facing the cable 2. The support fitting 7 is a member for attaching the heat pipe 8 to the base 5 and is made of a thin metal plate.
The heat pipe 8 has an arcuate portion 7a substantially following the shape of the outer peripheral portion, and a flat portion 7b extending radially from both edges of the arcuate portion 7a. Note that a protective rubber sheet 9 is interposed on the inner surface of the arc portion 7a.

The support member 7 is attached to the base 5 by connecting the flat portion 7b and the base 5 with bolts and nuts so that the axis of the arc portion 7a is aligned with the axis of the cable. I have. Further, in this specific example, the support fittings 7 are provided at a total of four locations, that is, two locations on the left and right sides and two locations above the base 5 in FIG. Note that the support 7 and the base 5 correspond to the holder of the present invention.

Next, the operation of the present invention configured as described above will be described. By the specific example of the above configuration,
To lay the heat pipe 8 inside the pipeline 1, first,
At the location such as the open end of the conduit 1, each base 5 is attached to the outer periphery of the cable 2 so that the three rollers 6 are in contact with the sheath 4 of the cable 2, and the heat pipe 8 is attached to a support fitting. 7 attaches to the base 5.

More specifically, each support fitting 7 and base 5
After loosening the fastening force between the bolt and the nut connecting the heat pipes, the heat pipes 8 are inserted into the respective arc portions 7a,
Tighten the bolt and nut again. Then, each heat pipe 8 is attached to the base 5 in a state where the heat pipe 8 is sandwiched between the support fitting 7 and the outer surface of the base 5. In this specific example, a container having a circular cross section and a straight shape is employed as the heat pipe 8. Also,
In this specific example, a plurality of locations in the longitudinal direction of each heat pipe 8 are attached to the base 5. In other words, a plurality of bases 5 are provided at intervals in the longitudinal direction of each heat pipe 8.

Next, in a state where both edges of each base 5 are spread apart so as to be separated from each other, each base 5 is moved in the radial direction of the cable 2 so that each base 5 can be viewed from the outer peripheral portion of the sheath 4 of the cable 2. 1 so as to cover the upper part from both sides. Then, each base 5 holding each heat pipe 8 is supported by the roller 6 on the outer peripheral side thereof in a non-contact manner with the cable 2. Therefore, the distance between each heat pipe 8 and the cable 2 can be arbitrarily set according to the size of the roller 6 and the shape of the base 5. In addition,
Even if the operation of attaching the base 5 to the cable 2 and the operation of attaching the heat pipe 8 to the base 5 are performed in the reverse order, nothing is supported.

Next, a plurality of bases 5 holding the four heat pipes 8 are sequentially sent out by a predetermined distance along the length direction of the cable 2. In this case, since three places in the circumferential direction of the cable 2 are supported by the three rollers 6, the base 5 does not shift in the circumferential direction of the cable 2 and moves smoothly while maintaining the mounting posture. . Thus, each heat pipe 8 is laid in the vicinity of the outer surface of the cable 2 along the length direction thereof. As described above, since each base 5 and each heat pipe 8 do not contact the cable 2 and only each roller 6 rolls on the outer surface of the cable 2, these units can be easily moved to the expected positions. Can be installed.

Next, the operation of cooling the cable 2 will be described. When the cable 2 generates heat with energization, the heat is transmitted to each heat pipe 8, and the working fluid sealed in the container is heated and evaporated. In this case, since both are arranged close to the inside of the same pipeline 1, heat transfer from the cable 2 to each heat pipe 8 is performed well, and the heat pipe operation is actively performed.

The working fluid vapor generated in the container of each heat pipe 8 flows toward the other end having a low internal pressure,
There it is deprived of heat and condenses. That is, the heat of the cable 2 is transported outside by the working fluid of the heat pipe 8. As a result, the cable 2 is cooled.

As described above, the cable 2 and the heat pipe 8
Are laid in the same pipeline 1 and both are close to each other, so that the thermal resistance between them is small, and as a result, the cooling capacity for the cable 2 can be improved as compared with the conventional case. Further, in the above specific example, since the heat pipe 8 does not contact the cable 2 and only the roller 6 contacts and rolls, the heat pipe 8 can be smoothly fed into the pipeline 1. As a result, the work of laying the long heat pipe 8 along the long cable 2 can be easily performed.

Next, another specific example will be described with reference to FIG. The example shown here is an example in which the auxiliary roller 10 is provided on the base 5, and the other configuration is almost the same as the above specific example. Auxiliary rollers 10 are attached to the left and right edges of the base 5 in FIG. 3 so as to rotate about an axis along the tangential direction of the base 5. Further, these auxiliary rollers 10 are in contact with the inner wall surface of the pipeline 1 respectively. That is, each auxiliary roller 10 is configured to rotate in contact with the pipeline 1 and to guide in the longitudinal direction.

Therefore, according to the above configuration, when moving the base 5 holding the heat pipe 8 along the longitudinal direction of the cable 2, each auxiliary roller 10 rolls on the inner wall surface of the pipe 1. As a result, the heat pipe 8 is moved more smoothly than when the auxiliary roller 10 is not provided and a part of the base 5 is in contact with the inner wall surface of the pipeline 1. Easy to do.

In the above specific example, a semicircular base is illustrated, but the present invention is not limited to the above specific example, and may have a U-shaped cross section, for example.

[0025]

As is apparent from the above description, according to the present invention, the heat pipe is attached to a predetermined position in the longitudinal direction of the heat pipe disposed on the outer peripheral side of the cable laid inside the conduit. The holder for holding the pipe, the holder and the heat pipe are supported in a state where the holder and the heat pipe are separated from the outer surface of the cable, and the holder is rolled by contacting the outer surface of the cable and rolling. Since a roller for moving the heat pipe in the longitudinal direction is provided, the work of laying the heat pipe in the conduit can be performed more easily than in the past, and the cooling capacity for the cable can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a specific example of the present invention.

FIG. 2 is a schematic diagram showing an arrangement relationship between a heat pipe and rollers of the specific example.

FIG. 3 is a schematic diagram showing another specific example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe line, 2 ... Cable, 5 ... Base, 6 ... Roller, 7 ... Support bracket, 8 ... Heat pipe.

Continued on the front page (72) Inventor Masayoshi Saito 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Minoru Shirakura 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd.

Claims (1)

[Claims] 1. A holder attached to a predetermined position in a longitudinal direction of a heat pipe disposed on an outer peripheral side of a cable laid inside a pipeline to hold the heat pipe, and the holder and the heat pipe A roller that supports the holder and the heat pipe in a state of being separated from the outer surface of the cable, and that moves the holder in the longitudinal direction of the cable by rolling in contact with the outer surface of the cable. A jig for laying a heat pipe for cooling a cable.