JP2002105915A - Dew condensation preventing method for curve mirror, its device, and curve mirror using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a curve mirror main body from getting wet with dew without use of a special heating body. SOLUTION: A dew condensation preventive device 20 provided with a turned-up guide cylinder 21 and a fan 22 is combined with the curve mirror main body 10. The dew condensation preventive device 20 which heats the curve mirror main body 10 is heated by making use of the air from the upper side of the curve mirror main body 10 and the surface temperature of the curve mirror main body 10 can be kept higher than the dew point of the ambient air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for preventing dew condensation on a curved mirror which can effectively prevent dew condensation on a curved mirror without using a special heating element, and a curve mirror using the same. About.

[0002]

2. Description of the Related Art A curved mirror having a dew condensation preventing function has been proposed (for example, Japanese Patent Application Laid-Open No. Hei 8-209637).

A conventional curve mirror with a condensation preventing function is as follows.
It is formed by incorporating a heater into a curved mirror body composed of a convex mirror. Therefore, in this apparatus, the heater is energized to heat the curve mirror main body, thereby preventing condensation on the surface of the curve mirror main body.

[0004]

According to the prior art, the curved mirror body uses the heat of the heater to prevent dew condensation, and the power consumption of the heater is large.
You have to use large capacity batteries and solar cells,
There has been a problem that the product cost tends to be excessive.

Accordingly, an object of the present invention is to provide air at natural temperature (air taken from the atmosphere, which is not subjected to a special temperature change operation such as heating or cooling) in view of the problems of the prior art. The same applies to the following), a method for preventing dew condensation on a curved mirror, which can effectively prevent dew condensation on the surface of the curved mirror without using a special heating element, and reduce product cost, and a device therefor. There is in providing a curved mirror that uses it.

[0006]

According to a first aspect of the present invention for achieving the above object, in preventing dew condensation on a curved mirror, air at a natural temperature is forcibly blown toward a curved mirror body. That is the gist.

[0007] Air can be blown to the back side or the front side of the curved mirror body.

Further, air can be blown from above the curved mirror main body, and the surface temperature of the curved mirror main body can be maintained at a temperature equal to or higher than the dew point of the air in contact with the surface side of the curved mirror main body.

The gist of the second invention is to provide a fan for forcibly blowing air at a natural temperature toward the curved mirror body.

[0010] The fan may be supplied with power by a solar cell panel, or may be provided with a guide tube for guiding air to the curved mirror body.

According to a third aspect of the present invention, a curved mirror body,
The gist of the present invention is to provide a dew condensation preventing device according to the second invention to be combined with a curved mirror body.

[0012]

According to the first aspect of the invention, the curved mirror body can effectively prevent dew condensation by forcibly blowing air at a natural temperature. In general, the reason why condensation occurs on the curved mirror is that the surface temperature of the curved mirror falls below the dew point of the surrounding air due to the radiation cooling phenomenon. Therefore, if air is forcibly blown to the curved mirror main body and the surface temperature of the curved mirror main body is forcibly matched with the temperature of the surrounding air, dew condensation does not occur on the curved mirror main body. This is apparent from the fact that even under radiant cooling, if there is a slight wind, dew condensation hardly occurs on the curved mirror facing the windward direction.

The surface temperature of the curved mirror main body can be quickly matched with the temperature of the surrounding air by blowing air to one or both of the front side and the rear side.

[0014] The surface of the curved mirror body can be made to more effectively prevent dew condensation on the surface by sending air from above to match the surface temperature with the air above. The air above the curved mirror body is generally warmer than the air around the curved mirror body due to the formation of the ground inversion layer even if radiative cooling occurs, so the curved mirror body is heated and This is because the surface temperature of the mirror main body can be reliably set higher than the dew point of the surrounding air. However, "above the curve mirror main body" means above the lower end of the curve mirror main body, and more preferably at least 1 to 1.5 m or more from the upper end of the curve mirror main body.

In order to prevent the dew condensation on the curved mirror main body, generally, the surface temperature of the curved mirror main body only needs to be maintained at a temperature equal to or higher than the dew point of the surrounding air. It is sufficient that the temperature is not lower than the temperature of the surrounding air, and it is sufficient if the temperature is equal to or higher than that.

According to the structure of the second invention, the fan is
Air at a natural temperature is forcibly blown toward the curved mirror main body to prevent dew condensation on the curved mirror main body.

If power is supplied to the fan by the solar cell panel, the fan can be operated without using a commercial power supply. The solar panel is combined with a battery of sufficient capacity to operate the fan continuously from at least every sunset to the next morning, and floats and charges the battery during daylight hours when the sun is shining. To generate the electric power required to continuously operate.

If a guide cylinder is added,
Air above the curved mirror body can be easily guided to the curved mirror body. The fan may be mounted on the distal end side of the guide cylinder, or may be mounted on the base end side of the guide cylinder, that is, on the curve mirror main body side.

According to the third aspect of the invention, a curved mirror having a dew condensation preventing function can be easily realized by combining the curved mirror main body and the dew condensation preventing device according to the second aspect of the present invention.

[0020]

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

The curved mirror is a curved mirror body 10
And the dew condensation preventing device 20 (FIGS. 1 and 2).

The curved mirror body 10 includes a convex mirror 11 and
It is configured by combining the back plate 12 and the eaves member 13. The convex mirror 11 is formed of a glass material, a stainless steel material, or the like, has a convex mirror surface on the front surface, and has a flange 11a protruding to the back surface formed all around. Back plate 12
Are the vent holes 12a in the central portion and the exhaust holes 12 in the outer peripheral portion.
., 12b,... and are screwed into the flange 11a via set screws 12c, 12c. The eaves member 13 is screwed to the upper part of the convex mirror 11 via set screws 12c, 12c,... And protrudes forward of the convex mirror 11.

The curved mirror body 10 includes a bracket 1
5. It is supported by a pole 17 via a sub bracket 16. The bracket 15 is fixed to a central portion of the back plate 12 via a reinforcing plate 15b, set screws 15c, 15c. The bracket 15 and the reinforcing plate 15b include:
The ventilation holes 12a are formed in common. Deputy bracket 1
6 is fixed to the pole 17 via bolts 16b, 16b. The bracket 15 and the sub-bracket 16 are connected via common bolts 15a, 15a, and the bracket 15 is tilted up and down with respect to the sub-bracket 16 via an elongated hole 15a1 through which a lower bolt 15a is inserted. Can be.

The dew condensation preventing device 20 includes a guide tube 21, a fan 22, and a solar cell panel 23.
The guide cylinder 21 is mounted upward on the back surface of the curved mirror body 10 via a lower bracket 21a.
The bracket 21a is fixed to the guide cylinder 21 via bolts 21c, 21c, and set screws 21b, 21b
Are screwed to the back plate 12. The lower part of the guide cylinder 21 is bent laterally and communicates with the inside of the curved mirror body 10 through the ventilation hole 12a.

The solar cell panel 23 has a set screw 23a1
, 23a1,..., The case 2 at the upper end of the guide cylinder 21
3b is mounted diagonally (FIGS. 1, 3). Case 2
3b are formed with suction holes 23b1, 23b1... At the bottom, and are provided with guide cylinders 2 through set screws 23b2, 23b2.
1 is fixed to the upper end flange 21d. A fan 22 is mounted on an opening 23b3 communicating with the guide cylinder 21 at the bottom of the case 23b. The case 23b has a fan 23, a control circuit 23c combined with the solar panel 23, and a battery 23d. Is stored.

The solar cell panel 23 floats and charges the battery 23d by daytime sunlight, and can operate the fan 22 by the battery 23d at night.
That is, the fan 22 is operated by being supplied with power from the solar cell panel 23 via the battery 23d,
The air at the natural temperature above the curved mirror main body 10 can be forcibly blown to the back side of the curved mirror main body 10 via the.

Such a curved mirror functions as follows.

The dew condensation preventing device 20 introduces warm air from above the curved mirror main body 10 to the back side of the curved mirror main body 10 even when the surface temperature of the curved mirror main body 10 decreases due to the radiation cooling phenomenon. Thereby, the convex mirror 11 is heated to a temperature equal to or higher than the temperature of the surrounding air. Therefore, the convex mirror 11 is maintained at a surface temperature equal to or higher than the dew point of the air in contact with the front surface side, and no dew condensation occurs on the front surface side.

In general, dew condensation occurs on the surface of the convex mirror 11 of the curved mirror body 10 installed outdoors because the surface temperature of the convex mirror 11 becomes lower than the dew point of the surrounding air due to the radiative cooling phenomenon. This is because the relative humidity of the air in contact with the side reaches 100%. on the other hand,
At this time, a ground inversion layer is generated, and the temperature of the ground surface portion is the lowest, and the temperature increases as the distance from the ground surface increases. That is, if warm air from above the curved mirror main body 10 is blown to the curved mirror main body 10 via the fan 22, the convex mirror 11 is heated, and dew condensation on the convex mirror 11 can be effectively prevented.

In the above description, if the guide cylinder 21 has a height of 1 to 1.5 m or more above the curved mirror main body, the effect is generally sufficient. Further, it is preferable that the guide cylinder 21 and the case 23b are made of a synthetic resin which is excellent in heat insulation, mechanically strong, and lightweight.

[0031]

[Other Embodiments] In the dew condensation preventing device 20, a connection box 24 is provided on the back side of the curved mirror main body 10 (FIGS. 4 and 5), and the control circuit 2 for the fan 22 and the solar cell panel 23 is provided.
3c and the battery 23d can be stored in the connection box 24.

The fan 22 faces the ventilation hole 12a on the side of the curved mirror main body 10 through the ventilation hole 24a on the connection box 24 made of, for example, a synthetic resin. The guide cylinder 21 communicates with the connection box 24 via a connector 24b, and the connection box 24 is airtightly closed via an opening / closing lid 24c. The connection box 24 is fixed to the back plate 12 via a mounting flange 24e and set screws 24d. Therefore, the fan 22 sucks air from above the curved mirror main body 10 into the connection box 24 through the guide cylinder 21 and the ventilation holes 24a, 1b.
Forced air is blown to the back side of the curved mirror body 10 via 2a to prevent condensation on the convex mirror 11. In addition,
4 and 5, the solar cell panel 23 is disposed on the guide cylinder 21, the pole 17, the curved mirror main body 10, or an appropriate base (not shown), and is connected to the control circuit 23c and the battery 23d via a cable (not shown). Shall be connected.

The fan 22 is connected to the nozzle 2 in the guide cylinder 21.
A jet pump type blowing function may be realized via 2b (FIG. 6). The guide cylinder 21 can suck air above the curved mirror main body 10 and blow the air to the curved mirror main body 10 by the airflow from the nozzle 22b by the fan 22 (in the direction of the arrow in the figure).

The dew condensation preventing device 20 may blow air toward the surface of the curved mirror main body 10 through injection nozzles 25, 25 arranged on the peripheral edge of the convex mirror 11 (FIG. 7).
(A)). The injection nozzles 25, 25 have nozzle holes 25a, 25a,... Formed toward the center of the convex mirror 11. The injection nozzles 25 are connected to the guide cylinder 21, and are connected to the curved mirror main body 1 via a fan 22.
It is assumed that air is blown from above 0. Therefore,
The fan 22 blows the upper air along the surface side of the convex mirror 11 through the injection nozzles 25, 25, and can prevent dew condensation on the curved mirror main body 10. The injection nozzle 25 may be made to protrude toward the surface of the curved mirror main body 10 (FIG. 7B), and air may flow along the surface of the convex mirror 11 (in the direction of the arrow in FIG. 7).

In the above description, the fan 22 is
6 to 6, air may be blown to the back side of the curved mirror main body 10 and air may be blown to the front side of the curved mirror main body 10 according to FIG. The guide cylinder 21 is
Instead of the self-standing type, a part or the whole thereof may be a flexible hose, and the upper end may be supported higher than the curved mirror main body 10 by a suitable column member, a gantry or the like.

The guide cylinder 21 may be omitted. At this time, the fan 22 is
Air around the bottom of the curved mirror body 10, preferably air above the lower end of the curved mirror body 10,
The surface temperature of the curved mirror body 10 can be matched with the temperature of the surrounding air, and can be maintained at the dew point of the surrounding air or higher.

The dew condensation preventing device 20 may be formed separately from the curved mirror body 10. Further, the dew condensation preventing device 20 can be used in combination with an existing curve mirror having no dew condensation preventing function.

[0038]

As described above, according to the first aspect of the present invention, the surface temperature of the curved mirror main body is reduced by the radiant cooling phenomenon by forcibly blowing air at the natural temperature toward the curved mirror main body. Even if it is lowered, dew condensation on the curved mirror main body can be effectively prevented, so that there is no need to use a special heating element, and there is an excellent effect that the product cost can be reduced.

According to the second and third aspects of the present invention, the provision of the fan for forcibly blowing the air at the natural temperature can prevent the dew condensation on the curved mirror main body, and the first aspect of the present invention can be easily implemented. .

[Brief description of the drawings]

FIG. 1 is an explanatory view of the entire configuration longitudinal section.

FIG. 2 is an enlarged exploded perspective view of a main part (1).

FIG. 3 is an enlarged exploded perspective view of a main part (2).

FIG. 4 is an enlarged sectional view of a main part showing another embodiment.

FIG. 5 is an exploded perspective view of a main part of FIG. 4;

FIG. 6 is a schematic explanatory view showing another embodiment.

FIG. 7 is an explanatory diagram of a main part configuration showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Curve mirror main body 20 ... Condensation prevention device 21 ... Guide cylinder 22 ... Fan 23 ... Solar cell panel

Claims (9)

[Claims] 1. In preventing dew condensation on a curved mirror,
A method for preventing dew condensation on a curved mirror, which comprises forcibly blowing air at a natural temperature toward the curved mirror body. 2. The method for preventing dew condensation on a curved mirror according to claim 1, wherein air is blown to the back side of the curved mirror body. 3. The method for preventing dew condensation on a curved mirror according to claim 1, wherein air is blown to the front side of the curved mirror body. 4. The method for preventing dew condensation on a curved mirror according to claim 1, wherein air is blown from above the curved mirror main body. 5. The method for preventing dew condensation on a curved mirror according to claim 1, wherein the surface temperature of the curved mirror body is maintained at a temperature equal to or higher than the dew point of air in contact with the surface side of the curved mirror body. . 6. A dew condensation preventing device for a curved mirror, comprising a fan for forcibly blowing air at a natural temperature toward the curved mirror body. 7. The dew condensation preventing device for a curved mirror according to claim 6, wherein the fan is supplied with power by a solar cell panel. 8. The dew condensation preventing device for a curved mirror according to claim 6, further comprising a guide tube for guiding air to the curved mirror main body. 9. A curved mirror comprising: a curved mirror main body; and the dew condensation preventing device according to claim 6 combined with the curved mirror main body.