JPH0697149B2 - Terminal of heat pipe container with anticorrosion layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is to improve the corrosion resistance of a container end portion of a heat pipe with an anticorrosion layer.

(Prior Art) Heat pipes have come to be used for various heat transports as heat transfer elements for heat transport. With the increase in capacity of underground power cables, heat pipes have come to be used for cooling power cables as well, but in order to accompany power cables, long heat pipe containers of 20 to 200 m are needed. is necessary. Copper, aluminum, stainless steel, etc. are generally used as the heat pipe container, but copper and aluminum containers are generally considered to be suitable for cooling the power cable from the viewpoint of price etc. . By the way, the groundwater-embedded power cable is laid in a duct in the ground, and is in a bad corrosive environment due to groundwater, humidity and the like. Therefore, when using a copper or aluminum container, to prevent corrosion,
A pitch was coated on the surface of an aluminum container and the surface was covered with a polyethylene tube or the like to provide an anticorrosion layer, and in particular, a special anticorrosion structure was applied to the terminal portion of the container.

As shown in FIG. 3, this anticorrosion structure is prepared by stripping the pitch (not shown) and the polyethylene tube (2), which are coated on the surface of the container end (1) such as copper or aluminum, to the end cap of the container. (3) is covered and welded at the welded portion (4) and the entire container end portion is covered with a polyethylene adhesive tape (5). However, this structure has a drawback in that it is easily scratched by handling at the time of construction on the electric power cable, and also has mechanical strength that is damaged and water is invaded to corrode the metal of the heat pipe container.

(Means for Solving Problems and Actions Thereof) The present invention has been made to solve the above-mentioned problems. The container end portion, the polyethylene tube coated on this surface, and the end cap of the container are The surface is covered with an epoxy resin to form a first protective layer, and the outside is covered with a cap made of polyethylene or polyvinyl chloride to form a second protective layer. This end is covered with a polyethylene adhesive tape to form a first adhesive layer. It is characterized in that a third layer is formed by coating a heat-shrinkable tube on the outside of the layer. In addition, the end of the container and the surface of the polyethylene tube covered with this surface are covered with a polychloride adhesive tape to form a first adhesive layer, and this surface, the end of the container and the end cap of the container are covered with an epoxy resin. As a first protective layer, the outside is covered with a polyethylene or polyvinyl chloride cap to form a second protective layer.
Heat-shrinkable tube as a second protective layer, which is covered with a polyethylene adhesive tape at its end to form a second protective layer. It is the container terminal part of the pipe.

That is, in the first aspect of the invention, first, the container end, the polyethylene tube coated on the surface of the container, and the end cap of the container are made of an epoxy resin that has excellent adhesiveness to a metal such as aluminum and has improved mechanical strength in a cured state. Since the first protective layer is coated to fix the terminal portion of the container, the strength is maintained.

Next, the outside is covered with a cap such as polyethylene or polyvinyl chloride to form a second protective layer. Although such a waterproof protective layer further enhances the water resistance, there is a risk that water may enter from the end portion of the cap, so a polyethylene adhesive tape is wrapped around the end portion of the cap so that the first It is used as an adhesive layer to enhance waterproofness. A heat-shrinkable tube is coated on the outer side of the tube to serve as a third protective layer to further improve waterproofness.

In the first invention, waterproofness and strength are enhanced by the first to third protective layers and the first adhesive layer, but in the second invention, waterproofness is further enhanced. That is, in the second invention, the container end and the surface of the polyethylene tube covered with this surface are wound and covered with a polyvinyl chloride tape having good adhesiveness to any of polyethylene, epoxy resin, and metal, and the first adhesive is applied. Layer. This surface, the end of the container, and the end cap of the container are covered with an epoxy resin to form a first protective layer, whereby the end of the container is strongly fixed. The outside is covered with a cap made of polyethylene, polyvinyl chloride or the like to form a second protective layer to enhance waterproofness. Then, the end portion of this cap is wrapped with a polyethylene adhesive tape to cover it to form a second adhesive layer to further enhance waterproofness. Further, the outermost layer is covered with a heat-shrinkable tube to form a third protective layer.

That is, in the second invention, since the end portion of the heat pipe container and the polyethylene tube are covered with the first polyvinyl chloride tape having excellent adhesiveness,
Even if the outer second adhesive layer is damaged, the first adhesive layer can be used for waterproofing.

The above configuration is intended to be easily performed by hand and particularly applicable to work in a narrow duct.

(Embodiment 1) FIG. 1 is a view showing an embodiment of the first invention, (1) is an end of a heat pipe container, (2) is a polyethylene tube coated thereon, and (3) is The end cap of the container, (4) is the welded part of the end cap.
As a heat pipe container, use an aluminum pipe with an outer diameter of 52.5 mm and a length of 30 m that is coated with a pitch (not shown) on the surface and a polyethylene tube is coated on this surface to form an anticorrosion layer with an outer diameter of 58.5 mm. I was there. The pitch and polyethylene of the end portion (1) of the heat pipe container were peeled off, the end cap (3) of the container was covered, and the end portion of the cap was welded at the welding portion (4). A two-part, room-temperature-curable epoxy resin so that the container end (1) thus prepared, the polyethylene tube (2) coated on the surface thereof, and the end cap (3) of the container are wrapped around the entire surface. It was covered with (6) and fixed to form a first protective layer. Next, the outside was covered with a polyethylene cap (7) having a thickness of 2 mm to form a second protective layer. A polyethylene adhesive tape having a rubber-based adhesive layer (trade name: EFCO No. 2) was wound around the end of the cap to cover the end portion, and the polyethylene adhesive tape (5) was used as the first adhesive layer. . A heat-shrinkable tube (8) was further coated on the outer side of the tube, which was then heated to 80 to 100 ° C. with a burner so as to be tightened to form a third protective layer.

Example 2 An example of the second invention is shown in FIG.

A polyvinyl chloride adhesive tape (9) having a rubber-based adhesive layer is wound around the end (1) of the heat pipe container and the surface of the polyethylene tube (2) using a heat pipe container having exactly the same material and dimensions as in Example 1. It was rotated and covered to form a first adhesive layer. Next, this surface was coated with the same epoxy resin as in Example 1 to form a first protective layer. Then, the outside was covered with the same polyethylene cap (7) as in Example 1 to form a second protective layer. Next, the end portion of this cap is wrapped with a polyethylene adhesive tape (4) to cover it to form a second adhesive layer (4), and the outermost layer is covered with a heat-shrinkable tube (8) and shrinked by heat to produce a first adhesive layer. 3 was used as the protective layer.

(Effect) As described above, in the first aspect of the invention, the protective layer composed of three layers and the
Since the end portion of the heat pipe container is protected by the adhesive layer of two layers and is protected by the three protective layers and the two adhesive layers in the second invention, the mechanical strength is high and the waterproof property is excellent. Moreover, since it is easy to handle, it has excellent industrial workability such as excellent workability in the duct.

[Brief description of drawings]

FIG. 1 is a sectional view of a terminal portion of a heat pipe container with a waterproof layer according to an embodiment of the first invention, and FIG. 2 is a sectional view of a terminal portion of a heat pipe container with a waterproof layer according to the embodiment of the second invention. FIG. 3 is a sectional view of a terminal portion of a conventional heat pipe container with a waterproof layer. 1 ... End of heat pipe container, 2 ... Polyethylene tube, 3 ... End cap of container, 4 ... Welded portion, 5 ... Polyethylene adhesive tape, 6 ... Epoxy resin, 7 ... Polyethylene cap, 8 ... … Heat-shrinkable tube, 9 …… Polyvinyl chloride adhesive tape

Claims (2)

[Claims] 1. A cap made of polyethylene or polyvinyl chloride, wherein the end of the container, the polyethylene tube coated on the surface of the container and the surface of the end cap of the container are covered with an epoxy resin to form a first protective layer, and the outside of the first protective layer is made of polyethylene or polyvinyl chloride. To form a second protective layer, the end portion of which is covered with a polyethylene adhesive tape to form a first adhesive layer, and a heat-shrinkable tube is further coated on the outside to form a third protective layer. The terminal part of the heat pipe container with the characteristic anticorrosion layer. 2. A container is provided with a polyvinyl chloride adhesive tape to cover the end of the container and the surface of a polyethylene tube covered with this surface to form a first adhesive layer. To form a first protective layer, the outside of which is covered with a cap made of polyethylene or polyvinyl chloride to form a second protective layer, and the end portion of which is covered with a polyethylene adhesive tape to form a first adhesive layer, Further, a heat-shrinkable tube is coated on the outer side of the heat-shrinkable tube to form a third protective layer.