JPS60133107A - Traffic mark - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a traffic sign that prevents snow and frost from accumulating on the traffic sign, maintains a clear sign surface, and facilitates construction and maintenance work.

During the winter, in many regions and cold regions, roads become unclear and cannot function as traffic signs, leading to serious problems such as traffic accidents.

One possible solution to this problem is to use commercial power to heat the sign surface with an electric heater, etc.; It has not been put into practical use due to the risk of causing an unexpected short circuit or electric shock due to an accident, and the need for maintenance work after installation.

Furthermore, the concept of heating the sign surface by utilizing geothermal heat using a heat pipe is disclosed in Japanese Patent Publication No. 5429. For example, as shown in Fig. 1, the condensing side part 3 of the heat pipe 2 buried underground on the back side of the sign surface l of a traffic sign is located in an enlarged or multi-branched structure. The outer surface of the section 3 is used as the sign surface 1, and the working fluid 4 in the heat pipe 2 is heated by geothermal heat, evaporates, and heat is transferred to the condensation side 3 on the back of the sign surface 1, and the sign surface l
It is used to heat the

In this method, the hydraulic fluid 4 that has absorbed geothermal heat directly heats the sign surface l, which is preferable in terms of high heat transfer, but it also warms the sign surface l and prevents snow and frost formation. For this purpose, it is sufficient if the sign surface temperature is around 5 degrees Celsius, and a very high heat transfer is not necessary. Furthermore, since the condensing side portion 3 of the heat pipe 2 and the sign surface l are integrated, it is impossible to adjust the angle or replace the sign surface l after installation.

That is, at the production stage, the dimensions and shape of the heat pipe 2 must be determined according to the conditions of the installation location, and the condensing side part 3 of the heat pipe 2 must be enlarged or processed into a multi-branched structure. After that, it is necessary to evacuate the inside of the heat pipe 2, resulting in extremely low productivity.

Furthermore, even when the sign surface 1 is replaced, there are drawbacks such as the need to replace the entire traffic sign including the heat pipe 2, and this has not yet been put into practical use.

There are some that are installed on the back of the sign surface. however,
The contact area between the cylindrical heat pipe and the planar heat transfer conductor is extremely small, and an air layer is likely to form between the heat pipe and the heat transfer conductor, increasing thermal resistance and reducing thermal efficiency. Furthermore, if the shape of the heat pipe is processed to match the angle of the sign surface, or if a heat conductor with good heat transfer coefficient is used, there are problems such as increased costs.

Therefore, the purpose of the present invention is to eliminate all of the above-mentioned drawbacks by using a heat pie that pumps up geothermal heat and a heating section that heats the surface of the sign using a different heat transfer system using a heat exchanger. It is an object of the present invention to provide a practical traffic sign that prevents binding and has extremely high productivity and construction workability.

According to the present invention, geothermal heat is pumped up by a pipe,
In this traffic sign whose sign surface is heated by geothermal heat, a heat exchanger filled with a heat medium is attached to the heat radiation part of the heat pipe, a heating chamber is formed on the sign surface, and the heat exchanger A traffic sign is provided in which the heating chamber is removably connected to the heating chamber.

Hereinafter, the present invention will be explained in detail based on the embodiment shown in FIG.

The traffic signs indicated by 5 as a whole include instruction signs, regulation signs, curved mirrors, delineators, and various traffic signals depending on the installation location and purpose, and each sign is formed on the sign surface 6.

First, the heat pipe 7 for effectively pumping geothermal heat is filled with an appropriate amount of working fluid 8 such as ammonia, and is evacuated and has a certain size. The heat pipe 7 is installed at a depth of 2 m to 10111 cm to effectively pump up geothermal heat.
), the heat pipe 7 is temporarily installed, fixed with cracked stones and concrete, and installed. In addition, in order to prevent heat loss of the absorbed geothermal heat, the heat pipe 7 is installed underground.
It is inserted into the sign post 9 from the vicinity of point m to a heat exchanger 13, which will be described later, while being covered with a heat insulating material such as a urethane encapsulant.

A bag-like body 10 made of polyethylene or the like is placed on the back side of the sign surface 6 so as to form a heating chamber 10 extending over the area requiring heating.
' is attached at the top of the heating chamber 10, and an opening/closing opening 11 for heating medium injection is provided at the top of the heating chamber 10, and heating medium circulation ports 12a and izb are provided at the upper and lower parts, respectively. Although not shown, the portion of the bag-shaped body lO' exposed to the outside air is covered with a heat insulating material.

Reference numeral 13 denotes a heat exchanger, which includes a heat transfer system that transfers the geothermal heat pumped up by the heat absorption section 15 of the heat pipe 7 to the heat radiation section 14 of the heat pipe 7 using the working fluid 8, and a heating system that heats the sign surface 6. It exchanges heat with a heat transfer system that transfers heat to the greenhouse 10, and is attached to the sign post 9 at a position lower than the position of the heating room 10. The heat exchanger 13 is provided with at least one heat pipe connection loe 6;
With the heat radiating portion 14 of the doped pipe 7 positioned within the heat exchanger 13, the connection port 16 is sealed with a seal ring or the like. The heating chamber 10 is located above and below the heat exchanger 13.
Heating medium circulation ports 17a, 17b are provided corresponding to the heating medium circulation ports 12a, izb, respectively, and the upper heating medium circulation ports 17a, 12a and the lower heating medium circulation ports 17b,
12b and flexible insulating ports 18a, 18b are removably connected, and the flexible insulating ports 18a, 18
By removing b, the sign surface 6 with the heating chamber 10 attached
can be removed from the heat exchanger 13. Heat exchanger 13, combustible insulation hose 18a.

The interior of the sign surface heating heat transfer system, in which 18b is the heating chamber 10, is filled with a heating medium 19 through the heating medium injection opening/closing opening 11 of the heating chamber 10, and is degassed. The sign surface 6 to which the heating chamber 10 is attached is fixed to the sign post 9 so that the sign surface 6 can be adjusted vertically and horizontally as desired by a row of fasteners.

Next, the operation of the heat transfer system of the present invention will be explained. First, in the geothermal absorption heat transfer system using the heat pipe 7, the working fluid 8 of the heat pipe 7 is heated and vaporized by the geothermal heat in the heat absorption part 15, and is converted into a heat medium 19 in the heat radiation part 14 located in the heat exchanger 13.
The geothermal pumping cycle of transferring heat to the earth, liquefying it, and lowering it to the heat absorption part 15 is repeated.

Next, the sign surface heating heat transfer system uses the heat medium 1 whose temperature has increased by the heat radiating section 14 of the heat pipe 7 in the heat exchanger 13.
9 causes convection due to the difference in specific gravity, and moves from the heat medium circulation port 17a of the heat exchanger 13 into the heating room lo via the flexible heat insulating hose 18a and the heat medium circulation port 12a of the heating room 10, As a result, the sign surface 6 is heated. Since the sign surface heating heat transfer system is a closed system filled with the heat medium 19, natural circulation is efficiently performed by the thermosiphon action. The heat medium 19 in the heating room lo whose temperature has been lowered by heating the sign surface 6 is transferred from the heat medium circulation port 12b of the heating room 10 to the heat exchanger via the flexible heat insulating hose 181) and the heat medium circulation port 171). Move to 13. That is, heat exchanger 13 - heat medium 1
9 Temperature rise - Burnt insulated hose 18a - Heating chamber 10 - Sign surface 6 Heating - Heat medium 19 Temperature fall - Burnt insulated hose 1
8b--Heat exchanger 13 performs a cycle of heat transfer.

As mentioned above, the heat radiation part 14 of the heat pipe 7 is connected to the heat exchanger 1.
3, heat loss is extremely small, the sign surface heating heat transfer system is filled with the heat medium 19, and the heating chamber 10 is
Since it is located higher than the heat exchanger 13, heat is always evenly transferred to the heating chamber 0. In addition, a plurality of heat exchangers 13 are attached to one heat pipe 7, and a plurality of sign surfaces 6
It is possible to heat the When installing the heat exchanger 13 in the middle of the heat pipe 7, simply pass the heat pipe 7 through the heat exchanger 13.
There is no need to process the material into a complicated shape or use a capillary phenomenon to install a wick, and the sign surface heating transmission system is easily constructed from flexible and elastic members, making it easy to manufacture and install. is high.

As described above, according to the traffic sign of the present invention, the sign surface heating heat transfer system is filled with a heat medium and degassed, so heat loss in the heat exchanger is kept extremely low and a good heat transfer coefficient is achieved. This allows natural circulation to occur evenly, and by heating the sign surface, snow accretion and
This is a practical traffic sign that can prevent frost formation.

In addition, by adding multiple heat exchangers, it can be used for traffic signs with multiple sign surfaces, and the heat pipes used at the same time can be of a fixed size and shape. It has excellent versatility and productivity as there is no need to prepare pipes. In addition, the sign surface can be replaced independently of the pipe, which has excellent practical benefits in terms of economy and ease of operation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a traffic sign using a conventional heat pipe. It is. 6... Sign surface 7 - Heat pipe 10... Heating chamber 13... Heat exchanger 18a, 18b... Combustible insulation hose 19... Heat medium applicant Kyocera Corporation Procedures Assistant Device (Method) April 11, 1980 1. Indication of the case 1988 Patent Application No. 241432 2. Name of the invention Traffic sign 3. Relationship with the person making the amendment case Patent applicant address Higashino, Yamashina-ku, Kyoto City 52-114 Inoue-cho Date of amendment March 7, 1980 Column 6 for brief explanation of drawings in the specification, Contents of amendment 4, Brief explanation of drawings Figure 1 uses a conventional heat pipe FIG. FIG. 2 is a sectional view of the traffic sign of the present invention. 6...Sign surface 7...Heat pipe 10...Heating chamber 13...Heat exchanger 18a, 18b...Flexible insulation hose 19...Heat
medium

Claims (1)

[Claims] In a traffic sign in which geothermal heat is pumped up by a heat pipe and the sign surface is heated by this geothermal heat, a heat exchanger filled with a heat medium is attached to the heat radiation part of the heat pipe, and a heating chamber is installed on the back of the sign surface. A traffic sign characterized in that the heat exchanger and the heating chamber are removably connected to each other.