JPS6323124A - Sunlight collecting device - Google Patents

Abstract

PURPOSE:To prevent an excessive temperature rise or drop at a sensor section so as to guarantee the normal operation of the sensor section and improve the sunlight collecting efficiency of a sunlight collecting device, by producing an air flow inside the sensor section. CONSTITUTION:When a suction pump 30 is actuated, the air in a spherical body 2 is led to a base body section 1 through an air hole 31 provided in the supporting arm 16 on one side and cooled by a heat exchanger 33 provided in the base body section 1. The cooled air is returned to the spherical body section 2 through another air hole 32 provided in the supporting arm 16 on the other side, but the air is discharged toward a sensor section 12 from the end section of the supporting arm 16 as shown by the arrow C after passing through the supporting arm 16. Then an air flow is produced inside the sensor section 12 and hot air staying in the sensor section 12 is blown out. Therefore, the entire temperature inside the spherical body section 2 does not rise and temperature of the sensor section 12 can be controlled to a prescribed level.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a solar light collection device, and in particular, a solar light collecting device, which includes a lens for concentrating sunlight into a transparent capsule, and a sensor for detecting the direction of the sun. In the sunlight collecting device, which detects the direction of the lens and makes the light-receiving surface of the lens follow the movement of the sun to constantly collect sunlight efficiently, an air flow is generated in the capsule, and This is intended to prevent malfunction of the sensor due to temperature rise or temperature drop within the capsule.

FIG. 1 is a perspective view for explaining an example of a sunlight collecting device previously proposed by the applicant. In the figure, 1 is a cylindrical base portion, 2 is a transparent spherical body portion, and these This constitutes a capsule 3 for a solar collector, and in use, a solar collector bag @10 is accommodated in the capsule as shown. This sunlight collecting device 1o includes a large number of concentrically arranged lenses 11□ to 11□ for concentrating sunlight, for example, 19 lenses, and a sunlight direction sensor 12 for detecting the direction of the sun. Support frame 1 that holds these in one piece
3. A first motor 15 for rotating these in the direction of arrow A. A support arm 16 that supports the lenses 11□ to 11□ and the motor 15, a rotating shaft 17 disposed perpendicular to the rotating shaft of the motor 15, and a rotating shaft 17 for rotating the rotating shaft 17 in the direction of arrow B. The sunlight direction sensor 12 detects the direction of the sun, and the detection signal is used to control the lenses 11□ to 111.
The first and second motors are controlled so that the lenses 11□ to 11□ always face the direction of the sun.

The sunlight focused by the lens is introduced into a large number (19 in the example of FIG. 1) of optical conductor cables (not shown) whose light-receiving ends are arranged at each focal position of the lens, and the optical conductor cables It is possible to transmit the information to any desired location.

Therefore, in the above-mentioned solar light collecting device, in order to protect the solar light collecting device from wind, rain, dust, etc., the sunlight collecting device is placed inside a transparent capsule as shown in FIG. However, as a result, the temperature inside the capsule increases (or decreases due to an abnormal drop in outside temperature, etc.), which has various negative effects on the equipment inside the capsule. There have been drawbacks such as the characteristics of the sensor section that detects changes due to temperature rise or fall, resulting in inefficient collection of sunlight. The present invention solves the above-mentioned drawbacks of the conventional technology. In particular, it is designed to generate an air flow within the capsule, thereby preventing abnormal temperature rise or fall of the sensor part so that the sensor always operates normally, This allows for efficient collection of sunlight at all times.

FIG. 2 is a schematic side sectional view of the main parts for explaining one embodiment of the solar light collecting device according to the present invention. In FIG. 1, 14 is a first rotating shaft rotated by a first motor 15; is a second motor for rotating the second rotating shaft 17;
．． ~11. are lenses, and these lenses 111-11s are the lenses 111-11. shown in FIG. It corresponds to
These lenses 11□-11. The sunlight focused by is introduced into the light guides 211 to 21s whose light-receiving end surfaces are arranged at the focal point of each lens (however, in the present invention, the sunlight focused by the lens 113 shown in FIG. Since the light guide 22 is provided, a lens corresponding to the lens 11. is not used).

FIG. 3 is a schematic configuration diagram of the lens system made up of a large number of lenses as described above, viewed from the back side.

In the illustrated example, 18 lenses consisting of 11□ to 11□ (however, 11° is not included) are arranged approximately concentrically,
Light guides 21□ to 21□ are placed at the focal point of each lens (however,
21. The light-receiving end face of each light guide (not shown) is arranged, and the light-emitting end of each light guide is centered at the center of the lens system as shown and connected within the light guide 22 at the center, through which any desired and is used for illumination or other purposes at any desired location. In this way, sunlight focused by a large number of lenses 111 to 111s is introduced into the light guides 21□ to 21□ arranged opposite to each lens, but the light emitted from each light guide is The end sides are gathered at the center of a substantially concentric circle formed by a large number of lenses, and a single light guide 22 is located at the center of the circle.
Since the solar light introduced into each light guide is transmitted to any desired location through the single light guide 22, the wiring of the light guides is very easy.

It is also possible to use a light guide as a light guide in addition to a light guide cable, and the cost for the light guide can be reduced.

Therefore, as mentioned above, a sunlight collecting device is housed in the capsule, and a sensor installed in the sunlight collecting device detects the direction of the sun so that the lens surface always faces the direction of the sun. In the solar light collecting device to be controlled, it is impossible to capture all the light that enters the capsule into the light guide, and the temperature inside the capsule increases due to the sunlight that is not captured, causing the device inside the capsule to In particular, the sensor section is easily affected by temperature, and as shown in Figure 2, at midday when the light-receiving surface of the lens coincides with the meridian, the sensor section is exposed to the apex of the capsule where temperature concentration occurs. The sensor was located nearby and there was a risk that the sensor would malfunction. ``The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and in particular, generates an air flow in the sensor section, thereby preventing excessive temperature rise or fall of the sensor section. This is intended to ensure the normal operation of the sensor and improve sunlight collection efficiency.

In FIG. 2, 30 is a suction pump, and 31 and 32 are air circulation holes provided in the support arm 16.

33 is a heat exchanger, and when the suction pump 3o is operated, the air in the spherical body part 2 is guided to the base part 1 through the air circulation hole 31 provided in one of the support arms 16, and the air in the base part 1 is It is cooled by a heat exchanger 33 provided in the. The air cooled in this way is then returned to the spherical body part 2 through the air circulation hole 32 provided in the other support arm 16, but at this time, the air that has passed through the support arm 16 is Arrow C inside
As shown in , it is emitted from the tip of the support arm 16 toward the sensor section 12 . Therefore, an air flow is generated in the sensor section 12, and the hot air accumulated in the sensor section 12 is blown away, so that the air in the sensor section 12 does not become abnormally high temperature.

The air thus blown away is transmitted through the air bleeding holes 31 to the base body part 1 in the manner described above, where it is cooled by the heat exchanger 33 and thus
The overall temperature inside the spherical body part 2 does not become high.
The temperature of the sensor section 12 can be suppressed to a predetermined temperature.

The base portion 1 houses a control circuit 34 that processes signals from the sensor 12 and controls the motor 15.18. If hot air hits the control circuit 34, there is a risk that the control circuit 34 will malfunction. Therefore, in order to avoid such an inconvenience, the base portion 1 is divided into two by a partition plate 35 as shown in the figure, and the control circuit portion It is a good idea to prevent hot air from hitting 34.

Furthermore, not all of the sunlight focused by the lens is introduced into the light guide, and the focused image of sky light is too large to be introduced into the light guide, so some of the sunlight that is not collected is not necessarily introduced into the light guide. is converted into thermal energy and the spherical body 2
This increases the temperature inside the spherical body and has an adverse effect on the equipment inside the spherical body. The condensing reflector plate 36 is provided to alleviate such problems, and the condensing reflector plate 36 reflects the light and sky light that was not introduced into the light guide due to the reasons mentioned above, and makes the reflected light L' and the reflected light L' is introduced into the light guide and the light guide, not only can the temperature rise inside the spherical body be reduced, but also the solar light collection efficiency can be improved. Further, in the above embodiment, an example was shown in which the suction pump 3o was provided in the airflow passage 31, but the present invention is not limited to the above embodiment.

It will be easily understood that a blower may be provided in the air flow passage 32 instead of the suction pump 3o, and furthermore, both a suction pump and a blower may be provided.

In addition, although we have explained cases in which the airflow passage is provided within the support arm and the case in which the sunlight direction sensor is provided in the center of the lens system, the sunlight direction sensor does not necessarily have to be located in the center of the lens system. It is not necessary, nor does it necessarily require that air flow holes be provided in the support arm.Furthermore, the generation of the air flow may be continuous or intermittent, or A temperature sensor may be provided in the capsule, preferably in the vicinity of the sunlight direction sensor in the capsule, and the air flow may be generated when the temperature in the capsule becomes above or below a predetermined value. In the case where the sunlight direction sensor is provided at the center of the lens system, the temperature of the sunlight direction sensor section is highest at midday when the light receiving surface of the lens system coincides with the meridian. (In other words, the temperature inside the capsule is highest near the apex of the spherical body, and when the sunlight direction sensor is installed at the center of the lens system, the sunlight direction sensor A microswitch or the like is provided on the first rotation axis or the second rotation axis to detect when the lens system approaches the meridian (closest to the apex of the capsule). An air flow may be generated toward the sunlight direction sensor when the sunlight direction sensor reaches the sunlight direction sensor. In addition, although the above explanation focused on lowering the air temperature inside the capsule using a heat exchanger, conversely, the thermal energy inside the capsule is actively taken out using the heat exchanger, and the thermal energy inside the capsule is It is easy to understand that the temperature inside the capsule may be lowered as a result.

Furthermore, in the above explanation, the main focus was placed on the case where the temperature inside the capsule increases, but in some cases, the temperature inside the capsule may become abnormally low in relation to the outside temperature. In such a case, thermal energy may be supplied from the outside through a heat exchanger into the capsule to maintain the temperature inside the capsule at a predetermined temperature.

As is clear from the above description, according to the present invention, the temperature inside the capsule, in particular, the excessive temperature rise or fall of the sensor part inside the capsule is effectively suppressed, thereby preventing malfunction of the sunlight sensor. Furthermore, it is possible to improve the solar light collection efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining an example of a sunlight collecting device to which the present invention is applied, and FIG. 2 is a schematic side view of main parts for explaining an embodiment of the sunlight collecting device according to the present invention. The cross-sectional view, FIG. 3, is a schematic configuration diagram of the lens system shown in FIG. 2, viewed from the back side. 1... Capsule base portion, 2... Capsule spherical body portion,
3... Capsule, 10... Solar collector section, 11
□~11□,... Lens, 12... Sunlight direction sensor, 14... Rotating shaft, 15... Motor, 16...
Support arm, 17... Rotating shaft, 18... Motor, 21□
~21□9 mountain light guide, 22... light guide, 30...
Suction pump, 31° 32...Air circulation hole, 33...
Heat exchanger, 34... Control circuit, 35... Partition plate, 36
...Light condensing reflector. Patent applicant Takashi Mori - Figure 1 Figure 2

Claims (6)

[Claims] (1) a lens for concentrating sunlight; a sensor for detecting the direction of the sun; a light guide into which the sunlight focused by the lens is introduced; a first rotation shaft that rotatably supports a member; a support arm that supports the first rotation shaft; and a support arm that rotatably supports the support arm about an axis perpendicular to the first rotation shaft. and a transparent capsule that houses the overall structure, and the direction of the sun is detected by the sensor, and the first rotation axis and the second rotation axis are adjusted to receive light of the lens. In the solar light collecting device, the surface of the solar light collecting device is controlled to face the direction of the sun so that sunlight focused by the lens is introduced into the light guide, and the capsule is a transparent spherical body that houses the solar light collecting device part. and a base part that supports the spherical part, the base part has a heat exchanger, and the air in the spherical part is cooled or heated in the base part and is returned to the spherical part. A sunlight collecting device characterized by: (2) The lens is composed of a large number of lenses arranged in a substantially concentric circle, the light receiving surface of the light guide is arranged at the focal point of each lens, and the large number of light guides are connected to a single light guide. Claim 1, characterized in that the single light guide is disposed coaxially through the first rotation axis.
) The solar light collecting device described in item 1. (3) The sunlight collecting device according to claim (2), wherein the light guide is disposed coaxially with the second rotation axis through the support arm. (4) The sensor according to claim 2 or 3, wherein the sensor is disposed at the center of a substantially concentric circle formed by the plurality of lenses. Solar collector. (5) The sun according to claim (4), wherein an air flow is generated in the sensor section when the light receiving surface of the lens is near a meridian (including the meridian). Light collection device. (6) The blower or the suction pump is attached to the support arm, and the air flow in the sensor section is performed through an air circulation hole bored in the support arm. ) to (5).