JPH037787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of melting ice and snow adhering to the branch lines of utility poles using a heat pipe to prevent the branch lines from being cut due to ice and snow.

(Prior Art) FIG. 3 is a schematic explanatory diagram of a method for preventing ice and snow cutting of utility pole branch lines using a heat pipe.

In the drawing, 1 is a utility pole, 2 is its branch line, and 3'
is a heat pipe, and the heat absorbing and evaporating part 31' of the heat pipe 3' is buried in the soil 4, and its heat dissipating and condensing part 32' is arranged along the branch line 2, especially the snow-covered part. The endothermic evaporation part 31' of the heat pipe 3' pumps up soil heat from 3 to 5 meters or deeper underground, and this heat is radiated by the heat dissipation and condensation part 32' above the ground, causing the ice and snow around the branch line 2 to be pumped up. This method prevents the branch line 2 from being cut due to ice and snow.

(Problems to be Solved) In the above-described method of preventing ice and snow cutting of utility pole branch lines using heat pipes, effective use of soil heat is important. That is, by pumping up too much soil heat, there is a risk that there will be insufficient soil heat when snow melting is required in March and April, making it impossible to melt ice and snow around utility pole branch lines.

In the conventional method, the heat dissipation and condensation part 32' of the heat pipe 3' with a circular cross section is simply arranged along the branch line 2, but as shown in Figure 4, snow melting is especially necessary in the snowy part. The snow inevitably melts in areas A that are not covered by the soil, and it is particularly difficult to melt snow in areas B that require snow melting, making it impossible to say that soil heat is being used effectively. Ideally, the snow should be melted evenly around the heat pipe, but the heat reaches the snow in area A where the heat pipe is in contact, and the back side of the branch line 2 seen from the heat pipe 3' receives sufficient heat. This is because it is difficult to reach and melt snow.

This causes too much soil heat to be pumped up.
This poses a problem in consistently supplying the necessary and sufficient heat during the period required for snow melting.

(Means for Solving the Problems) The present invention provides a method for preventing ice and snow cutting of utility pole branch lines using heat pipes that solves the above-mentioned problems.
The above-ground part of the heat pipe, which is a mmφ copper pipe or aluminum pipe, is wound spirally around the branch line of a utility pole.

(Embodiment) FIG. 1 is an explanatory diagram of an embodiment of the method for preventing ice and snow cutting of utility pole branch lines according to the present invention, and the same symbols as in FIG. 3 represent the same parts.

In this example, an easily bendable copper or aluminum pipe with an outer diameter of about 4 mmφ to 10 mmφ is used as the heat pipe container, and it is buried in the ground at a depth of 1 to 8 meters or more, and The part is spirally wound on the branch line 2 so that the height is higher than the snowfall at the place where it is installed, for example, 3 to 4 m above the ground.

If the outer diameter of the heat pipe container is less than 4 mmφ, the required amount of heat cannot be obtained, and if the outer diameter is 10 mm or less, the required amount of heat cannot be obtained.
If it exceeds mmφ, it will be difficult to wrap it around the branch line 2, so an outer diameter of about 4 mmφ to 10 mmφ is preferable. For example, using a copper heat pipe with an outer diameter of 6 mmφ, the hydraulic fluid R1
In the case of 2, the maximum heat transport amount is about several tens of W,
There is no use of soil heat during the shortest period of winter. Regarding snow melting, if snow melts from 1 mm to several mm on the surface of the branch line 2 to which ice and snow have adhered, it is sufficient to prevent the branch line from being cut, and even a heat pipe with an outer diameter of 6 mmφ has sufficient snow melting ability.

FIG. 2A is a cross-sectional view of another embodiment of the present invention,
In the embodiment of FIG. 1, a heat insulating layer 5 of plastic material is provided on the outer periphery of the branch line 2.

In order to prevent the heat pumped up from the soil by the heat pipe 3 from being dissipated via the branch line 2, a heat insulating layer 5 made of a plastic material that acts as a heat resistance is provided on the outer periphery of the heat pipe 3 to prevent soil heat from being pumped up. It suppresses excess.

As the plastic material for the heat insulating layer 5, polyvinyl chloride, polyethylene, nylon, Teflon (registered trademark), etc. are used. Since the heat dissipation is small, the thickness is made relatively thick, for example, 1 mm or more, in order to increase the thermal resistance.

FIG. 2B is a cross-sectional view of still another embodiment of the present invention, in which a heat insulating layer 6 made of plastic material is provided on the outer periphery of the branch line 2 and heat pipe 3 provided with a heat insulating layer 5 as shown in FIG. It was established.

The thickness of this heat retaining layer 6 is preferably changed depending on the soil temperature so that snow melting is necessary and sufficient to prevent excessive pumping of soil heat.
For example, if the soil temperature is relatively low at 10℃ at 3 to 5 meters underground, the thickness of the coating should be thin, about 0.1 to 0.5mm, and if the soil temperature is relatively high, 15℃, the thickness should be thicker.
Approximately mm.

Physically, this heat insulating layer 6 has the effect of making it easier for the ice and snow around the heat pipe 3 and the branch line 2 to peel off and slide down, and thermally, the heat is used relatively evenly, and the ice and snow around the heat pipe 3 and the branch line 2 are Since the difference in snow melting and snow melting on the back side of the branch line 2 when viewed from the heat pipe side is reduced, heat can be used more effectively.

The heat insulating layer 6 may be covered with, for example, polyvinyl chloride or polyethylene adhesive tape, or
It is suitable to use these shrink tubes.
Furthermore, in the embodiment shown in FIG. 2B, a metal layer having low thermal resistance such as aluminum or copper may be provided on the outer periphery of the branch line 2 and the heat pipe 3, and the heat insulating layer 6 may be provided on the metal layer. . By doing so, the temperature difference between the branch line 2 and the heat pipe 3 is further reduced, and even more effective use of soil heat can be achieved.

(Effects of the Invention) According to the above-described method for preventing ice and snow breakage of utility pole branch lines of the present invention, since the heat pipe is wrapped around the outer periphery of the branch line, heat is uniformly transmitted over the outer periphery of the branch line, resulting in stable heat pumping. It is possible to increase In particular, when a small diameter copper pipe or aluminum pipe with an outer diameter of about 4 mmφ to 10 mmφ is used as a heat pipe container, it is easy to wrap it around a branch line, and stable snow melting is possible during the snowy season.

In addition, by providing a heat insulating layer on the branch line, or placing a heat insulating layer on the branch line and heat pipe all together, it is possible to prevent too much geothermal heat from being pumped up, and it is also possible to melt snow more evenly around the heat pipe and on the back side of the branch line. This makes it possible to make even more effective use of soil heat.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the method for preventing ice and snow cutting of utility pole branch lines according to the present invention, and FIGS. 2A and 2B are cross-sectional views of other embodiments. FIG. 3 is an explanatory diagram of the conventional method, and FIG. 4 is a sectional view for explaining the problems of the conventional method. 1... Telephone pole, 2... Branch line, 3... Heat pipe, 4... Soil, 5... Heat insulation layer, 6... Heat retention layer.

Claims (1)

[Claims] 1 The heat-absorbing and evaporating part of the heat pipe is buried underground,
The heat dissipation condensation section is placed along the branch line of the utility pole,
In a method to prevent ice and snow from breaking on utility pole branch lines that uses geothermal heat to melt ice and snow adhering to utility pole branch lines, the above-ground portion of a heat pipe, which is a copper pipe or aluminum pipe with a container outer diameter of 4 mmφ to 10 mmφ, is spirally attached to the utility pole branch line. A method for preventing ice and snow cutting of utility pole branch lines, characterized by wrapping the cables around the poles.