JPH0542203Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for melting snow on branch lines supporting utility poles.

PRIOR ART It is well known that among the supports of power transmission lines, wooden poles and concrete poles are provided with branch wires to provide reinforcement against wind pressure loads, horizontal loads, and the like. The branch line is usually a stranded wire made by twisting together three or more mild steel wires with a diameter of about 4 mm, and is strung diagonally between the utility pole and the underground anchor. Since this branch line is placed in the natural environment along with the power transmission line, the number of twists and the diameter of the strands are determined and constructed with consideration to environmental changes.
In any case, the branch wires are made of solid stranded wire, so
Abnormalities may occur in cold regions or in unexpected environments. In other words, if a branch line is buried in snow due to a large amount of snow, or if it is subjected to a large wind pressure load with a large amount of ice and snow, the load may become extremely large and the branch line may break or the utility pole may break. Accidents such as falling down occur.

Conventionally, as a device to prevent such accidents, a device that uses geothermal heat to melt snow was developed in 1986-152756.
It is proposed by No. This device brings one end of the heat pipe into contact with a branch line, and
The other end of the line is inserted into the ground, and the heat pipe is used to transport geothermal heat around the branch line to melt snow.

Problems that the invention aims to solve According to the above-mentioned conventional device, it is possible to melt the snow around the utility pole branch lines and prevent the accumulation of snow and ice, so it is possible to prevent an extreme increase in the load on the branch lines. However, since heat pipes used for snow melting on branch lines are also placed in the branch line environment in the same way as branch lines, in practical use they must be able to adapt to the diverse situations that occur in the natural environment. However, the conventional technology described above does not take any measures regarding this point, and there is still room for further improvement in preventing snow damage to branch lines using heat pipes.

This invention was made against the background of the above-mentioned circumstances, and the purpose is to provide a snow melting device for utility pole branch lines that is excellent in durability and has good thermal efficiency.

Means for solving the problem In order to achieve the above purpose, this invention has the upper end of the heat pipe aligned with the branch wire stretched diagonally between the utility pole and the underground anchor. In a snow melting device for a utility pole branch line, which is constructed by fixing the heat pipe and inserting the lower end portion of the heat pipe into a high-temperature heat collecting section underground, the heat pipe connects a flexible corrugated pipe to a container. It is characterized by being a corrugated heat pipe.

In particular, in this invention, an air layer is formed on the outer circumferential side of the heat pipe from a point near the ground surface to a point located at a predetermined depth, and a heat shrinkable material having electrical insulation properties is formed on the outer circumferential surface of the heat pipe. Preferably, a tube is attached.

Further, when a heat insulating material is provided around the outer periphery of the heat pipe, it is preferable to provide a gap between the heat insulating material and the heat pipe in order to prevent crevice corrosion.

Function: In the device of this invention, since the temperature of the underground heat collecting part is higher than the temperature of the utility pole branch line above ground, the working fluid evaporates inside the heat pipe at the lower end, and the vapor flows toward the upper end. flows and dissipates heat, resulting in
The geothermal heat carried by the heat pipes melts the snow around the utility poles. In that case, since the heat pipe is of a corrugated type, the working fluid that carries the heat widely wets the entire inner peripheral surface, so the actual area of the heat input part becomes larger, and a large amount of heat is used for snow melting. be able to. In addition, if the branch line is bent due to loads such as snow accumulation, ice accumulation, wind pressure, etc., since the heat pipe itself is flexible, the heat pipe will follow the branch line and bend, resulting in a high risk of abnormalities in the heat pipe. The heat pipe may be damaged due to the added load,
Alternatively, it is possible to effectively prevent the occurrence of a situation in which a part of the heat pipe separates from the branch line and the transmission of heat from the heat pipe to the branch line is obstructed. Furthermore, the upper end of the corrugated heat pipe, which is attached to the diagonally extending branch line, is especially attached to the lower side of the branch line, so that the heat of the high-temperature gas-phase working fluid inside the heat pipe is efficiently used. It can be transmitted well to the branch line. In other words, in a corrugated heat pipe, liquid-phase working fluid may accumulate in the inner recess on the lower surface of the corrugated heat pipe when it is installed diagonally. It acts as a heat insulating layer for the high temperature gas phase working fluid. If a corrugated heat pipe is placed along the top side of a branch line stretched diagonally, the bottom side of the corrugated heat pipe will be in contact with the branch line. The fluid prevents the heat of the high-temperature gas-phase working fluid inside the heat pipe from being transferred to the branch line, and as a result, there is a risk that the snow melting function of the branch line may not be sufficiently exerted. On the other hand, in the case of this device, since the corrugated heat pipe is attached to the bottom side of the branch line, there is a problem of heat transfer to the branch line being inhibited by the gas-phase working fluid accumulated in the recess on the bottom side of the corrugated heat pipe. The heat of the high-temperature gas-phase working fluid inside the heat pipe can be efficiently transferred to the branch line.

In particular, in this invention, an electrically insulating heat-shrinkable tube is attached to the outer circumferential surface of the heat pipe with an air layer formed on the outer circumferential side of the heat pipe from a point near the ground surface to a point located at a predetermined depth. By installing this, it is possible to efficiently melt snow on the branch line by preventing heat radiation from the heat collection part to the branch line, and at the same time, it is possible to insulate the induced current that accompanies power transmission.

Furthermore, when a heat insulating material is provided around the outer periphery of the heat pipe, crevice corrosion can be prevented by providing a gap between the heat insulating material and the heat pipe.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an embodiment of this invention, in which a branch line 2 for reinforcing a utility pole 1 has one end fixed to the utility pole 1 and the other end fixed to an underground anchor 3. As a result, it is stretched diagonally to the utility pole 1. This branch line 2 is made of twisted mild steel wires, for example, and a heat pipe 4 is attached and tightly fixed to the lower surface of the branch line from approximately the middle to the lower part, and the lower end of the heat pipe 4 is inserted into the ground. It is inserted even into the heat collecting part 5 whose temperature is relatively high. As shown in FIG. 2, the heat pipe 4 has a structure in which a corrugated pipe is used as a container to provide flexibility, and substantially only a condensable fluid is sealed therein as a working fluid. The portion is fixed to the lower surface side of the branch line 2 with a binding tape such as heat insulating tape or aluminum tape. In addition, the entire heat pipe 4 is
It is covered with a heat-shrinkable tube 6 made of synthetic resin having electrical insulation properties, and the heat-shrinkable tube 6 covers a portion of the heat pipe 4 from a point near the ground surface to a predetermined depth (for example, a portion of the heat pipe 4 from
0.5 to 1.5 m), and forms a heat insulating effect with the outer circumferential surface of the heat pipe 4 at a portion from near the ground surface to a predetermined depth. It is configured so that an air layer 7 is generated. In this installation state of the heat shrink tube 6, the heat shrink tube 6 and the heat pipe 4 are
After the two are fitted together, the heat-shrinkable tube 6 may be shrunk from both ends so that air remains inside without heating at necessary locations.

Note that it is preferable that the place where the heat pipe 4 is drawn into the ground be separated from the place where the branch line 2 is drawn into the ground, as shown in FIG. excavation work becomes easier.

Next, the operation of the apparatus configured as described above will be explained.

When it snows, the temperature on the ground side becomes lower than the temperature of the heat collecting part 5 underground, so the lower end of the heat pipe 4 located in the heat collecting part 5 becomes the heating part, and the upper end along the branch line 2 becomes the heating part. Since the side serves as a cooling section, the working fluid sealed inside evaporates at the lower end, and the vapor flows to the upper end to radiate heat.
Therefore, the heat pipe 4 carries geothermal heat to the ground side to melt snow on the branch line 2. In this case, since the heat pipe 4 is a corrugated pipe as a container, the working fluid generated on the ground side flows down along the inner peripheral surface of the heat pipe 4 while wetting the entire surface, which causes heat input. The working fluid is widely supplied to the entire area, in other words, the substantial heating section (heat input section) is widened, which increases the amount of heat input and enables efficient snow melting. Here, in the upper end side portion of the heat pipe 4 that is attached to the diagonally stretched branch line 2, the heat pipe 4 is also inclined, so that the bottom surface of the heat pipe 4 is Liquid-phase working fluid may accumulate in the inner recess of the corrugated pipe on the side, but the heat pipe 4
Since it is attached to the lower surface side, the upper surface side part where the liquid phase working fluid does not accumulate as described above is the branch line 2.
Therefore, the liquid-phase working fluid accumulated in the recess as described above will not impede the transfer of heat from the high-temperature gas-phase working fluid inside the heat pipe to the branch line 2. Furthermore, the heat pipe 4 operates in a state where there is a temperature difference, and even if it is underground, the temperature near the ground surface is as low as above ground.
is provided on the outer circumferential side of the heat pipe 4, the working fluid vapor generated at the lower end of the heat pipe 4 does not radiate heat and liquefy while reaching the ground side part, and therefore the heat collecting part 5 The entire amount of heat input can be used for snow melting on the branch line 2, and efficient snow melting is possible in this respect as well. Furthermore, the heat pipe 4 generally uses a metal container in order to improve the thermoelectric coefficient and the heat transfer coefficient, but in the above device, it is covered with a heat shrink tube 6 having electrical insulation properties. Therefore, it is possible to insulate the heat pipe 4 and prevent electrolytic corrosion caused by the flow of induced current accompanying power transmission. and branch line 2
The heat pipe 2 bends somewhat due to frost heaving on the ground, wind pressure load, etc., but since the container of the heat pipe 2 is a flexible corrugated pipe, it deforms as the branch line 2 bends, and as a result, the heat pipe 4 Since no undue stress is applied to the material, damage to it can be prevented and durability can be improved.

As mentioned above, the temperature of the soil near the ground surface is about the same as the outside air temperature, and there is almost no difference in temperature between the ground and the ground during the snowy season, so the heat carried by the heat pipe 4 from the heat collecting section 5 is transferred to a place near the ground surface. There is a risk that it will be given to the soil. Therefore, in the above-mentioned device, the air layer 7 was provided on the outer circumferential side of the heat pipe 4, but in this invention, the air layer 7 is provided as shown in FIGS. 3 and 4.
A heat insulating material 8 may be provided instead. That is, a suitable protection pipe 9 is buried to a predetermined depth from the ground surface, a heat insulating material 8 is placed inside it, and a heat pipe 4 is inserted so as to create a void 10 between it and the heat insulating material 8. .

In the configuration shown in FIGS. 3 and 4, the specific means for maintaining the void 10 is arbitrary, but for example, as shown in FIG.
A plurality of protrusions 11 are formed on the inner circumferential surface of the cylindrical member and protrudes toward the axial position, and the gap 10 is maintained by these protrusions 11. In this case, it goes without saying that the protrusions 11 may be provided in a long strip over the entire length of the protective tube 9 and the heat insulating material 8 in the longitudinal direction, or may be provided only at several locations. In addition, instead of providing the protrusion 11 as described above,
An appropriate heat insulating spacer may be interposed between the heat pipe 4 and the heat insulating material 9.

Even with such a configuration, almost the entire amount of heat input in the heat collecting section 5 can be transported to the ground side portion. Further, by providing the air hole 10, it is possible to prevent crevice corrosion of the heat pipe 4 and improve its durability.

Effects of the Invention As is clear from the above explanation, the device of this invention uses a heat pipe with a flexible corrugated tube as a container, which makes it possible to supply sufficient working fluid to the entire part receiving heat, thereby improving thermal efficiency.In addition, it is possible for the heat pipe to deform in a way that follows the support wire, preventing undue stress from being generated in the heat pipe, and preventing damage to the heat pipe and a decrease in its durability.

Furthermore, since the upper end of the corrugated heat pipe is attached to the bottom side of the diagonally extending branch line, the top side of the corrugated heat pipe comes into contact with the branch line, so the bottom side of the inside of the heat pipe The working fluid accumulated in the concave portion does not prevent the heat of the high-temperature gas-phase working fluid inside the heat pipe from being transferred to the branch line, and the heat is efficiently transferred to the branch line, allowing the snow melting function to be fully demonstrated.

In addition, by covering the heat pipe with an electrically insulating heat shrink tube so that an air layer is created around the outer circumference of the portion of the heat pipe located near the ground surface, the heat pipe is insulated and the induced current is prevented from flowing. At the same time, the existence of an air layer prevents heat dissipation in the middle of the heat pipe, and the heat input at the heat collecting part can be effectively used for snow melting. In this respect as well, thermal efficiency can be improved.

Furthermore, when using a heat insulating material to prevent heat dissipation in the middle of the heat pipe, a space is set between the heat pipe and the heat pipe, thereby preventing clearance corrosion of the heat pipe and improving its durability. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing one embodiment of this invention, Fig. 2 is a schematic diagram showing the structure of the heat pipe, Fig. 3 is a partial schematic cross-sectional view when using heat insulating material, and Fig. 4 is a schematic diagram showing the structure of the heat pipe. 3 is a view taken along the line arrow 3, and FIG. 5 is an enlarged cross-sectional view showing an example of a configuration for maintaining a gap when a heat insulating material is used at the same position as FIG. 4. 1... Telephone pole, 2... Branch line, 3... Anchor, 4
... Heat pipe, 5 ... Heat collection section, 6 ... Heat shrink tube, 7 ... Air layer, 8 ... Insulation material, 10 ...
...Empty〓.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The upper end of the heat pipe is fixed along with a branch wire stretched diagonally between the utility pole and the underground anchor, and the lower end of the heat pipe is In the snow melting device for utility pole branch lines, the heat pipe is a corrugated heat pipe using a flexible corrugated pipe as a container, A snow melting device for a utility pole branch line, characterized in that an upper end portion of the heat pipe is attached to a lower surface side of the diagonally stretched branch line. (2) An electrically insulating heat shrink tube is attached to the outer peripheral surface of the heat pipe with an air layer formed on the outer peripheral side from a point near the ground surface to a point located at a predetermined depth of the heat pipe. A snow melting device for a utility pole branch line as set forth in claim 1 of the utility model registration claim. (3) A utility model registration request characterized in that a heat insulating material is disposed around the outer periphery of at least a portion near the ground surface of the heat pipe, and a gap is formed between the heat insulating material and the surface of the heat pipe. A snow melting device for utility pole branch lines as described in Scope 1.