JPH03287990A - Over-radiant heat prevention device of heat wire, etc. - Google Patents

Abstract

PURPOSE:To make it possible to exhibit the effect of radiant heat by bearing hollow bodies as wind-shielding covers on the peripheral surface of a radiation section of a heat wire combining a heat pipe to a pole branch line with a spring to be provided. CONSTITUTION:A wind-shielding cover 2 formed of an aluminum heat conduction material 3 and a plastic heat insulating material 4 in the shape of a cylinder is divided and placed to the peripheral surface of a heat wire 1. A spring 5 is provided between a mounting metal fitting 6 of the heat wire 1 and the heat insulating material 4, and even if heat is transferred to the spring 5, radiant heat is controlled. After that, a radiation section of the heat wire 1 is provided up to an anticipated snow height, a part above that is held by a wirewrap grip 13 and a ball insulater 12, and it is connected to a pole 10 through a stay 11. According to the constitution, snow melting operation can be sufficiently exhibited.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a heat pipe constructed by combining a heat pipe with a branch line that supports a supported object such as a telephone pole so that snow around the branch line can be melted. The present invention relates to an overheat radiation prevention device configured to minimize wasteful heat radiation in wires and the like during seasons without snowfall.

[Prior Art] Long erected structures such as utility poles are usually provided with branch lines to prevent them from collapsing.

When the amount of snow increases in a snowy area, the snow becomes compacted around the branch line due to the snow load, and a large downward settling force is generated. This sinking force is greater than expected and can cause utility poles to tilt and branch lines to break.

For this reason, workers remove snow around the branch line every time there is snow to prevent accidents caused by the settling force, but this requires a great deal of effort, time, and cost.

Therefore, as a measure to solve this problem of labor and expense, a heat wire in which a heat pipe is built into the branch wire has been proposed.

This is a composite wire made by twisting high tensile strength wires around the outer periphery of a heat pipe.

The heat wire 1 configured as described above is stretched between, for example, a utility pole 10 and an anchor 14 as a branch wire, as shown in FIG. 4, and one end of the combined heat pipe is buried underground. The heat collecting part 1a is used as the heat collecting part 1a, and the other end side is used as the heat radiating part 1b on the ground, and the snow around the heat radiating part ib is melted and the contact with the snow is cut off, so that the settling force of the snow is not transmitted to the branch line. , to prevent breakage of the above-mentioned branch line.

The heat pipe referred to here is a pipe-shaped sealed container filled with a working fluid that causes evaporation and condensation.The working fluid absorbs geothermal heat in the heat collecting part 1a, evaporates, and the vapor moves to the heat radiating section 1b, condenses and liquefies there, flows back to the heat collecting section 1a, and evaporates again. This process is repeated. Heat is released when the steam is condensed in the heat radiating section 1b, which melts the snow around the branch line.

[Problems to be Solved by the Invention] In the above-mentioned heat wire, the length of the ground heat dissipation section in which the heat pipe is built-in is determined based on the expected maximum snowfall height in the region.

Therefore, during periods when there is little snowfall, or even when there is no snowfall, when the outside temperature is low and the temperature difference between the ground and the ground is large enough, the heat pipe starts collecting geothermal heat, and that heat is wasted in the heat dissipation section. Heat is dissipated. In particular, on windy days, this heat dissipation effect increases, and the wasteful collection of geothermal heat continues at the heat collecting section, lowering the underground temperature, and as a result, the heat wire's snow melting ability is reduced when it snows. This could lead to a decline.

The purpose of the present invention is to minimize wasteful heat radiation in the conventional technology as described above, thereby sufficiently conserving geothermal heat, and improving efficiency when full-scale heat radiation becomes necessary due to large snowfall. The present invention aims to provide a novel device for preventing heat dissipation in a heat wire or the like that can exert a snow melting effect.

[Means for Solving the Problems] The present invention is a method in which, for example, a hollow body serving as a windshield cover is supported by a spring arranged around the outer periphery of a heat radiating part of a heat wire made by combining a heat pipe with a branch line for a utility pole. In addition, the windshield cover is constituted by a cylindrical body, and good heat conductive material and heat insulating material are arranged alternately in the circumferential direction,
A spring supporting this is attached to the heat insulating material side.

[Function] If the heat dissipation section is covered with a hollow windshield cover, the acceleration of heat dissipation due to wind is greatly reduced, and unnecessary heat dissipation is suppressed to a minimum. In addition, the windshield cover is supported by a spring, and when the settling pressure of the snow is applied due to heavy snowfall, the spring deforms due to the pressure of the snow, and the windshield cover and the heat radiating part of the heat wire come into contact with each other. In this way, the heat of the heat radiating section is transferred to the windshield cover and radiated, melting snow occurs, and the function as a heat wire can be reliably operated.

In this case, if the windshield cover is made into a cylindrical body, a good heat conductive material and a heat insulating material are arranged alternately in the circumferential direction, and a spring is attached to the heat insulating material side, heat is transferred to the cylindrical body side through the spring. It is also possible to appropriately prevent movement and wasteful heat radiation when there is no snowfall.

[Example] Hereinafter, a detailed explanation will be given with reference to an example in which the device of the present invention is attached to a heat wire.

FIG. 3 is an explanatory diagram showing a state in which the dissipation heat prevention device according to the present invention is attached to the heat dissipation part of the heat wire 1. FIG.

As explained earlier, the heat dissipation part of the heat wire 1 is provided up to the expected snowfall height, and above that the heat dissipation part of the heat wire 1 is provided to the wrapping grip 13.
It is held back by a ball insulator 2 and connected to a utility pole 10 by an ordinary branch line 11.

Reference numeral 14 denotes an anchor that anchors and fixes the entire branch line including the heat wire portion on the ground side.

In the present invention, windshield covers 2, 2 are attached to the outer periphery of the heat radiation section of the heat wire 1. The figure shows an example in which the length of each piece is approximately 500 to 1,000 mm for ease of installation, and is installed in multiple stages, but it is constructed from a single piece that is vertically split for ease of installation. There is no problem.

Further, in FIG. 3, the windshield cover 2 is shown in a longitudinal section for easy understanding, but specifically, it is formed in a cylindrical shape.

That is, FIGS. 1 and 2 show a case where the cylindrical windshield cover 2 is attached to the outer periphery of the heat wire 1.
FIG. 3 is an explanatory cross-sectional view illustrating a cross-sectional situation of a similar embodiment.

In this embodiment, the windshield cover 2 is composed of a heat conductive material 3 such as aluminum and a heat insulating material 4 such as plastic. Although each is installed in three separate locations, there is no substantial difference in other configurations.

A mounting bracket 6 is attached to the heat wire 1, and a spring 5.5 is provided between the mounting bracket 6 and the heat insulating material 4, and the windshield cover 2 is moved as shown in the figure by this spring 5.5. Supported. If the springs 5, 5 are attached to the heat insulating material 4, 4 side in this way, even if the heat of the heat wire 1 is transferred to the springs 5, 5, the heat is blocked by the heat insulating material 4.4. This suppresses heat dissipation.

If the spring 5 is connected to the good heat conductive material 3 side, the heat of the heat wire 1 will be radiated through the spring 5, and the effect of providing the windshield cover 2 may be halved.

In addition, the reason why the spring 5 is not attached to the good heat conductive material 3 side is to facilitate the contact between the heat wire 1 and the good heat conductive material 3 during snowfall, and to effectively achieve the intended purpose of the present invention. It also has another meaning of achieving.

For this purpose, the elastic force of the spring 5 in the present invention needs to be selected to suit the following effects.

That is, depending on the normal wind pressure, the spring 5 is not deformed to the extent that the windshield cover 2 comes into contact with the heat wire 1, and there is a gap between the windshield cover 2 and the heat wire 1 as shown in FIG. 1(a) or FIG. ) The air layer 7 shown in ) is formed as a heat insulating layer.

In this way, the internal heat wire 1 is protected by the windshield cover 2, and no wasteful heat is radiated even if it receives wind pressure.

Snow accumulation occurs, and the resulting large snow settling pressure is shown in Figure 1 (b
) or when the spring 5 is loaded as shown by the arrow P in Fig. 2(b), the spring 5 is easily deformed by such a large pressure, and as shown in each Fig. 2(b), the spring 5 is easily deformed. The heat wire 1 is brought into contact with the heat conductive material 3 in which the heat conductive material 5 is not present. As a result, the heat dissipated from the heat wire 1 is directly transmitted to the heat conductive material 3, and the original sufficient snow melting effect is produced. The snow-melting action is particularly noticeable in the direction of the arrow, where the snow settling pressure has been applied, resulting in a significant increase in thermal efficiency.

As described above, when there is no snow or when there is still little snow, the heat dissipation in the heat radiating part of the heat wire is prevented by the presence of the windshield cover 2, but when the snow is large and a settling force is applied, Heat is dissipated through the good heat conductive material 3 of the windshield cover 2, and the snow is melted more selectively, especially on the side where the settling pressure is applied.
The snow melting effect, which is the original purpose, will be fully demonstrated.

According to experiments, the following values are appropriate for the specific values of the spring constant necessary for the spring 5 to exhibit the above-mentioned effects.

It is now assumed that the maximum wind pressure due to the wind is 500 Pa.

A windshield cover 2 having an outer diameter of 30 calibers is supported by two springs 5.5 arranged at an interval of 180° as shown in Fig. 1, and is attached at intervals of 250 W in the longitudinal direction of the heat wire 1. For example, the spring constant of the spring 5 used =
Approximately 90 ON/m is appropriate.

Assuming that the windshield cover 2, which also has an outer diameter of 30 m, has three springs 5.5 arranged at 120° intervals as shown in Fig. 2, and is attached at 250° intervals in the longitudinal direction of the heat wire 1. , the spring constant of the spring 5 used is approximately 50 ON/m.

Note that the dissipation heat prevention device according to the present invention is not only applied to the above-mentioned heat wire, but also to those having a similar usage mode as a heat pipe, such as a heat pipe for melting snow on a steel tower. Needless to say, it is possible to suppress wasteful heat radiation. Further, the windshield cover does not necessarily have to be divided into materials having different thermal properties, and can be made of only a single material by selecting the material of the spring or a mounting method that allows heat insulation.

[Effects of the Invention] As described above, according to the overheat radiation prevention device according to the present invention, wasteful heat radiation in the heat radiation part is suppressed with a simple structure,
By preventing unnecessary heat collection from the heat source, sufficient heat dissipation effect can be achieved when heat dissipation is seriously required, and this can be applied to heat wires, etc. This enables efficient snow melting.

[Brief explanation of the drawing]

Figures 1 and 2 show two embodiments in which the device according to the invention is attached to a heat wire, in each figure (a) without snow and (b) with snow. Figure 3 is an explanatory diagram showing a situation in which the device according to the present invention is attached to a heat wire used as a utility pole branch wire, and Figure 4 is an explanatory diagram showing a situation in which a conventional heat wire is attached. FIG. 1: heat wire, 2: windshield cover 3: good heat conductive material, 4: heat insulating material, 5: spring, 6: mounting bracket, 7: air layer, 10: telephone pole.

Claims (2)

[Claims] (1) Consists of a hollow windshield cover that can be attached to the outer periphery of a heat radiating part such as a heat wire made by combining a heat pipe with a utility pole branch line, and can form an air layer between the heat wire and the heat wire via a spring. An overheat radiation prevention device such as a heat wire configured as follows. (2) A claim in which the windshield cover is constituted by a hollow cylindrical body, in which a good heat conductive material and a heat insulating material are arranged alternately in the circumferential direction, and a spring supporting the windshield cover is attached to the heat insulating material side. Item 1. Overheat radiation prevention device.