JPH05118776A - Heat conducting membrane - Google Patents

Abstract

PURPOSE:To obtain a heat conducting membrane capable of being cut into an arbitrary shape and area. CONSTITUTION:The heat conducting membrane consists of a plurality of small heat pipes 15 having a diameter of at most 1mm and a length of a few millimeters arranged in contact with one another, a caking agent 21 for retaining each of the small heat pipes 15 and a surface membrane 22 and a rear surface membrane 23 provided on each side face of the caking agent 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat conductive film having high heat conductivity.

[0002]

2. Description of the Related Art Conventionally, a heating wire or a pipe is arranged in a film when it is desired to make the temperature uniform over the film or generate heat. To prevent freezing of the valve body, etc., a copper tube through which steam is passed is wrapped around the valve body.

FIG. 6 is a plan view showing a heating wire arranged in a conventional film. This figure shows an electric blanket which is an example of heating using electricity as a heat source. A heating wire 14 for heat generation is laid in a very dense blanket 12 in a very dense manner.

FIG. 7 is a front view in which a pipe is arranged on the surface of a prior art object. This figure shows an example of the construction of a steam trace, which is an example of the valve body anti-freezing method. A copper pipe 3 having a diameter of about 10 mm is arranged between the pipe 2 and the pipe heat insulating material 4 to prevent freezing of the pipe portion, and steam is flown into the copper pipe 3.

FIG. 8 is a perspective view of a conventional device for preventing snow from melting and freezing on roads and entrances. Usually, geothermal heat, groundwater, heat from hot spring drainage, etc. are used as the heat source, and this figure shows the case of geothermal heat. It consists of an evaporation tube of the heat pipe 7 that receives heat from the ground and a condensation tube of the heat pipe 7 that radiates heat under the road surface. The medium vaporized in the evaporation section of the heat pipe 7 flows in the tube arranged under the road surface. , Heating the road surface 6,
The snow on the road surface 6 is melted and the road surface 6 is prevented from freezing.

FIG. 9 is a perspective view showing an example of floor heating in the prior art. A heat pump or
The hot water heated by the engine for generation is forcibly circulated in the hot water pipe 11 arranged on the floor 8 by a pump, indirectly warms the room, and returns to the heat pump or the like to be heated again.

[0007]

In the prior art shown in FIG. 6, the purpose cannot be achieved by breaking the heating wire 14 at one position. Therefore, the size of the blanket decided at the manufacturing stage is
After that, it cannot be cut into any shape and area depending on the application.

In the prior art shown in FIG. 7, in the case of preventing the valve body 1 from freezing, the copper pipe 3 is wound around the valve body 1 as shown in the figure, so that the valve body 1 is formed into a linear copper wire. Only the periphery of the tube 3 is heated, and the shape and area required for heating the valve body 1 cannot be obtained.

In the prior art shown in FIG. 8, the heating performance deteriorates when the heat pipe 7 under the road surface is damaged. Further, since the heat pipe 7 is buried in the ground, it is not easy to change the heating area.

In the prior art shown in FIG. 9, the heating performance is lost when the hot water pipe 11 is damaged, as in the case of the snow melting and freezing prevention device. Moreover, it is not easy to arbitrarily change the heating area at the beginning of construction.

As described above, the prior art does not consider the arbitrariness of the shape of the heat conducting film.

An object of the present invention is to provide a heat conductive film which can be cut to obtain an arbitrary shape and area.

[0013]

The above object can be achieved by holding a plurality of minute heat pipes which are in contact with each other in a binder for connecting a front surface material and a back surface material.

The outer diameter of the minute heat pipe is 1 m.
It is preferably m or less.

Further, it is desirable that the outer cylinder of the minute heat pipe is made of plastic.

..

According to the above construction, the plurality of minute heat pipes that are in contact with each other are held in the binder that joins the front surface material and the back surface material, and the heat applied to one end of the heat conducting film is the minute heat. Conducting from one end of the pipe to the other end, and from one end of the other micro heat pipe that contacts the other end of the micro heat pipe to the other end, heat conduction is performed by the micro heat pipes one after another in this way. Heat reaches the other end of the conductive film,
The function as a heat conductive film occurs.

Since the minute heat pipes are extremely small and held in large numbers, even if a part of the heat conducting film is damaged, the minute heat pipes in that part only lose their functions, and the other minute heat pipes function. Therefore, the thermal conductivity of the heat conductive film is maintained. Even if a part of the heat conducting film is cut in this way, it functions as a whole and can be cut freely to obtain a heat conducting surface having an arbitrary shape.

By setting the outer diameter of the minute heat pipe to 1 mm or less, the inner pressure and outer pressure proof strength increases.

By using plastic as the material of the outer cylinder of the minute heat pipe, the corrosion resistance becomes high, and it is possible to use it outdoors and to use ammonia, which cannot be used with a copper material, as the working medium.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

First, the basic characteristics of the micro heat pipe of the present invention will be described.

FIG. 1 is a cross-sectional view of a heat conductive film according to an embodiment of the present invention.

The heat conducting film comprises a minute heat pipe 15 having a diameter of 1 mm or less and a length of several millimeters, a binder 21 for holding each minute heat pipe 15, a front surface film 22 and a back surface film 23. .. When the heat-dissipating surface is a part or one surface, the other surface may be a heat insulating film having a small heat conductivity to improve the heat transfer efficiency. When a part of the heat conductive film is heated, the medium in the minute heat pipe 15 in the heated part evaporates, is cooled and condensed in the next minute heat pipe 15, and returns to the evaporation section by surface tension. .. In the next minute heat pipe 15, heat is transferred to the plane of the heat conductive film by the same phenomenon.

FIG. 2 is a vertical cross-sectional view of the heat conducting film of the embodiment of the present invention.

As shown in the figure, the respective minute heat pipes 15 are in close contact with each other to conduct heat between the minute heat pipes 15.

FIG. 3 is a cross-sectional view showing the structure of the minute heat pipe 15.

The micro heat pipe 15 is manufactured by cutting both ends of a plastic pipe, enclosing a single working medium 17 in an outer cylinder 16 and heating and adhering both ends. The working medium is selected such that evaporation and condensation are repeated within a range that does not result in excessive pressure under operating temperature conditions.
Usually, in the case of heating or freeze prevention, the temperature is about 10 to 50 degrees Celsius, and pure water is optimal in consideration of safety. For snow melting and freezing prevention on roads and entrances, use outdoors and ammonia or other medium. The wall thickness of the minute heat pipe 15 is determined so as to withstand the internal pressure and external force that can be placed under the operating conditions.
For that purpose, the smaller the diameter of the cylinder, the more advantageous. For example, allowable stress 2 kg / mm ² , wall thickness 20 μm, outer diameter 10
For plastic heat pipes of 00 microns (1 mm) and 100 microns, the withstand pressure is about 8 kg / cm ² when the outside diameter is 1000 microns, and about 80 kg / cm ² when the outside diameter is 100 microns. growing.
Similarly, with respect to the external force, the smaller the diameter, the greater the external force.
However, if the diameter is too small, the heat transfer capacity per unit heat pipe will be small, so the number of heat pipes required to transfer a predetermined amount of heat will increase, and the ratio of heat conduction through the outer cylinder of the heat pipe. And the heat conductivity of the outer tube is not as high as that inside the heat pipe, so the heat transfer performance of the heat conductive film is reduced. Since the outer cylinder film thickness is several microns to several tens of microns, plastics with poor thermal conductivity can be used. It is sufficient that the medium amount is 5% or less of the outer cylinder inner volume, but even if it exceeds 10%, the medium operates.

Next, specific examples of the present invention will be described.

FIG. 4 is a front view of a valve body using the heat conducting film of this embodiment for preventing freezing.

The copper pipe 3 for steam tracing arranged in the pipe 2 is linearly arranged in the valve body 1 as well.
The heat conducting film 20 covers the valve body 1 in contact with the. Copper tube 3
The heat conducting film 20 that receives heat from the steam inside the heat conducting film 20
Heat is transferred sequentially by the small heat pipes 15 inside the valve body 1
Keep the whole warm. Since the copper pipes 3 are arranged linearly along the pipes 2, the work is easy and the flow of steam is smooth. Also, the heat conductive film 20 can be cut in accordance with the valve body 1 and can be operated as a part of heat retention work.
Construction man-hours are also reduced.

FIG. 5 is a vertical sectional view of a road surface using the heat conductive film of this embodiment for preventing freezing. The heat conducting film 20 is arranged over the required heating surface and heat source portion. The heat source portion may be any of the hot water pipe 18, the hot drainage side groove 19 or a heater (not shown), and the areas of the heat source portion and the heating surface portion of the heat conductive film 20 are determined by the temperatures of the heat source and the heating surface. The heat conducting film 20 that receives heat from the heat source transfers heat sequentially through the internal small heat pipes, raises the temperature of the film on the entire heating surface, and serves to prevent freezing. It is easy to remove the heat conductive film 20 when the antifreeze is not needed. In addition to freeze prevention, it is possible to use a heat conductive film for floor heating in the building.

As described above, by heating a part of the heat conducting film of this embodiment, the temperature of the entire film is raised, so that the structure for preventing freezing and heating is simplified, and the mounting and maintenance are also easy. effective.

[0033]

According to the present invention, the heat conducting film can be formed into an arbitrary shape and area required for heating by holding a plurality of minute heat pipes which are in contact with each other. The effect that becomes easy is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat conductive film according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a heat conductive film according to an example of the present invention.

FIG. 3 is a transverse cross-sectional view showing the structure of the minute heat pipe of the embodiment of the present invention.

FIG. 4 is a front view of a valve body using a heat conductive film for freeze prevention according to an embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a road surface in which a heat conductive film is used to prevent freezing in the embodiment of the present invention.

FIG. 6 is a plan view of a heating wire arranged in a prior art film.

FIG. 7 is a front view in which a pipe is arranged on the surface of a prior art object.

FIG. 8 shows a perspective view of a conventional road surface anti-icing device.

FIG. 9 is a perspective view showing an example of floor heating according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 2 Piping 3 Copper pipe 4 Piping heat insulating material 5 Floor 6 Road surface 7 Heat pipe 8 Floor 11 Hot water piping 12 Blanket 14 Electric heating wire 15 Micro heat pipe 16 Outer cylinder 17 Working medium 18 Hot water piping 19 Hot drainage gutter 20 Thermal conductive film 21 Caking Material 22 Surface Film 23 Backside Film

Claims (3)

[Claims] 1. A binding material for bonding a front material and a back material,
A heat conducting film, characterized in that it holds a plurality of minute heat pipes that are in contact with each other. 2. The heat conductive film according to claim 1, wherein the outer diameter of the minute heat pipe is 1 mm or less. 3. The heat conductive film according to claim 2, wherein an outer cylinder of the minute heat pipe is made of plastic.