JPS6051208A - Curve mirror - 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 a curved mirror that is installed upright at curved corners or intersections where visibility is poor, so that the driver can see through the road ahead by reflection.

As a means to ensure safe driving of automobiles, many curved mirrors are currently installed next to roads with poor visibility.According to the conventional curved mirrors made by @, they are suitable for use in cold regions during the winter. If the outside air temperature drops below 15 degrees Celsius, the mirror surface becomes cloudy due to water droplets adhering to it, making it impossible to see the destination.

One possible solution to this problem is to heat and insulate the mirror surface, but since the number of curved mirrors installed is extremely large, a large capacity is required for the heat source, and therefore it is not cost effective. Therefore, this countermeasure has little practicality.

The present invention has been made in view of the current situation, and the purpose of the present invention is to provide a system that is easy to purchase, requires almost no maintenance cost, and has a mirror surface that does not fog up in cold regions. The purpose of the present invention is to provide a curved mirror that has the following features.

As a means to achieve this objective, the curved mirror of the present invention provides a closed space (hereinafter referred to as
a reflector formed with a jacket space (referred to as a jacket space) and installed at a required height above the ground;
A heat-receiving tank whose inner space forms a closed space (hereinafter referred to as heat exchange space) and which is buried underground, and insulation that communicates between the upper end of the jacket space and the upper end of the heat exchange space. An ascending pipe made of a Nonobu, a descending pipe made of a Nonobu, which communicates between the lower end of the jacket space and the lower end of the heat exchange space, and the space and the inner hole of the both dish pipes. It is characterized in that it is formed by an antifreeze solution filled in an annular closed space formed by.

The present invention will be explained below with reference to an illustrated embodiment.

As shown in Figures 1 to 3, the curved mirror of the embodiment is installed on the ground at a height H (for example, 3yn) for easy viewing.
A pipe support], a reflector 2 of easy-to-see size 4 (for example, diameter 1m) attached to the upper end of the support I, and a depth U of 1m or more underground E below the support 1 (for example, 1m) It is formed by a heat receiving tank 3 made of an iron plate power cylinder buried in An annular closed space (described later) is filled with an antifreeze solution (methanol solution 6 in the illustrated case).

Thus, the reflector 2 includes a convex reflector 7 with a flange 7a formed of a stainless steel plate, and a flange 7 of the reflector 7.
It is formed by a back plate 8 made of a circular iron plate spread on the surface with a side, and a stay 9 is provided at the center of the outer surface of the back plate 8.
is provided protrudingly, and the top and bottom of the outer surface are
The pipe fitting 8a and the pipe fitting 8b are open, and the back plate 8
The entire outer surface of is covered with a heat insulating material]0.

Note that the tip of the stay 9 is fixed to the upper end of the support column by a clamp.

On the other hand, the heat receiving tank 3 whose inner space does not form the heat exchange space 12 has a sufficient volume whose outer surface area exceeds ]d,
In addition, the lower end of the ascending passage pipe 4 opens on the upper plate of the tank 3, and the descending passage pipe 5 opens on the upper plate. The lower end of the through pipe 5 is opened to the bottom of the heat exchange space 12 after passing through the heat exchanger space 12 closely.

Therefore, after the descending pipe 5 made of metal pipe, resin pipe, etc. rises from the heat receiving tank 3, there is a crack in the middle.
3 is fixed to the support column 1, and its upper end is bent toward the reflector 2 side and then joined to a g-joint 8b at the lower end of a jacket space 14 forming the inner space of the reflector 2.

The rising pipe 4 is made of metal pipes, resin pipes, etc., and the outer circumference of the pipe is covered with a heat insulating material.
After rising from the upper plate of the tank 3, it passes through the inner hole of the support column 1, and its upper end is bent toward the reflector 2 and then joined to the pipe joint 8a at the upper end of the jacket space]4.

In addition, in the above-mentioned purchase, the reflector flange 7a and the back plate 8
The upper and lower end joints of both plates g4 and 5 are liquid-tightly sealed by a sealing member (not shown).

Finally, the annular sealed space that circulates through the heat exchange space 12→inner hole of the ascending pipe 4→jacket space] 4→inner hole of the descending pipe 5→heat exchange space]2 is filled with antifreeze tositenomethanol liquid 6. , is enclosed.

Next, we will discuss the operation of the curved mirror of the example purchased in this way.The characteristics of the geothermal temperature at a depth of In or more from the ground surface fluctuates somewhat depending on the level of the outside air temperature on the ground. The amount of variation is generally a slight variation range of less than IO°, and the minimum does not fall below 00 even in extremely cold seasons.

Therefore, during extremely hot and extremely cold periods, there is a temperature difference between the jacket space J4, which is at a temperature approximately equal to the outside air temperature, and the heat exchange space J4, which is at approximately the same temperature as the underground temperature. It is in.

By the way, in extremely hot seasons when the temperature of the jacket space 14 is higher than that of the heat exchanger space 12, the temperature of the methanol liquid in the annular closed space is only higher than that of the liquid above. No action is performed, but during extremely cold periods (when the outside air humidity is below 120°C and the mirror surface temperature is below 115°G), the jacket space 14 is lower in temperature than the heat exchanger space]2. jacket space J
Due to the difference in specific gravity between the liquid in I+ and the liquid in the heat exchange space 12, the jacket space] 4→downward passage pipe 5→heat exchange space 12→rising passage pipe 5→jacket space 14. A convection phenomenon occurs, and as a result, the methanol liquid, which has been heated by geothermal heat due to the heat exchange action of the heat receiving tank 3 and has reached a temperature of several degrees Celsius, flows through the jacket space 4 and keeps the reflector plate 7 warm at 0 degrees Celsius or higher. This prevents water droplets from forming on the mirror surface of the reflecting plate 7.

Here, the above-mentioned convection/heat retention phenomenon will be explained based on trial calculations from the aspect of heat exchange action during antifreeze convection, and the following data is used in the trial calculations below.

Liquid temperature in jacket space...--]00℃ outside air-1
5℃) Liquid temperature in heat exchanger space...0℃ (underground temperature + 2°G) Height between both spaces (H+U)...4
m Height of mirror surface (ri...1m Double passage pipe 4.5 Path length...15m Rising pipe 4
Inner hole diameter...0.02m0.825 (0°G
) Methanol liquid specific gravity...0.835 (-10℃) Methanol liquid specific heat...0.59/7 kc
a+ Thermal conductivity of air (k)...0O21/rnhr
. .

Next, the trial calculations for each element are as follows.

(1) Specular plane wall forced convection heat transfer (h) In this equation, μ= ] 63
kg/m1. .

Uo= 20 X3'600"72000 m/hrρ
= 1.29 kv Cp = 0.24, h = 15, 3 kcal /77j hroC.

(2) Amount of heat dissipation from mirror surface (Q) Q'= A X h X △t=--12X 15.3
X 5= 5 Q kcal/hr (3) Methanol liquid circulation amount (4) Flow rate of rising pipe 4 (v) Shima (5) Flow pressure required for reflux (△p) = 10.66 kg/m , the circulating pressure P caused by the difference in specific gravity between the two dish tubes 4 and 5 is p= (4X835)-(4xs2s)=4ok! 9/
Since m, p = 4oky/ln''>>△P20), 6
6 kg/m'', therefore, it can be seen that the convection operation of the methanol liquid in the annular closed space is reliably performed.

In this way, if the curved mirror of the embodiment is difficult, it is possible to keep the reflector warm by using underground heat by simply purchasing piping that does not have any moving parts, so it is possible to keep the reflector warm at low cost in cold weather. Cloudiness can be prevented.

As described above, according to the curved mirror according to the present invention, an antifreeze circulation passage is piped between a heat receiving tank buried underground and a reflector equipped with a convex reflector, thereby absorbing geothermal heat. Since we purchased the reflector to keep it warm at 0°C or higher, it is possible to install a curved mirror that does not fog in cold weather at a low cost, and it has a great practical effect of requiring almost no cost to maintain the mirror. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a mirror showing an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a sectional view of the reflector shown in FIG. 2. 2...Reflector, 3...Tank, 4...Rising pipe, 5
・・Descent pipe, 6・・Methanol liquid as antifreeze, 7
...Reflector, 8. Back plate, 10.15... Heat insulating material,
J2...Heat exchange space, J4...Jacket space. Patent applicant Seidensha Co., Ltd. Agent Patent attorney Satoshi Nishimura Tip rod Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A tank having a reflector having a jacket space formed between a reflector and a back plate of the reflector, the reflector being installed at a required height above the ground, and the inner space forming a heat exchange space. and a heat receiving tank buried underground, a rising pipe consisting of an insulated pipe that communicates between the upper end of the jacket space and the upper end of the heat exchanger space, and a lower end of the jacket space and the heat exchanger space. It is formed by a descending pipe made of a pipe that communicates with the lower end of the exchange space, and an antifreeze filled in an annular sealed space formed by the rain space and the inner hole of the both-way pipe. Curved mirror featuring 〇