KR100712726B1 - Apparatus for collecting light - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light collecting device, and in particular, a light collecting device for collecting and transmitting solar light to an optical pipe, comprising: a base and a rotating body rotatably installed with respect to the base using the first axis as a rotation center line. A first rotating means for rotating the center around the first axis line, a second mirror line intersecting the first axis line as a center of rotation, and rotatably installed with respect to the rotating body and reflecting the incident sunlight And a second rotating means for rotating the reflector about the second axis, and a condenser configured to focus the sunlight reflected from the reflector and to transmit the sunlight to the light pipe. The present invention relates to a light collecting device having a structure capable of controlling a tilt angle and a rotation angle of a reflector by tracking a trajectory of sunlight.

Description

Condenser {Apparatus for collecting light}

1 is a front view showing a light collecting device according to an embodiment of the present invention with the front part of the cover cut out;

FIG. 2 is a sectional view taken along the line II-II of the light collecting device shown in FIG. 1; FIG.

3 is a cross-sectional view taken along line III-III of the light collecting device shown in FIG. 1;

4 is an enlarged view of a portion "A" of the cover of the light collecting device shown in FIG.

<Description of the symbols for the main parts of the drawings>

10: base 20: rotating body

31: 1st axis 32: driven gear

33: drive gear 34: first motor

40: reflector 41: auxiliary reflector

51: second axis 52: driven pulley

53: drive pulley 55: second motor

61 Fresnel lens 62 optical focus lens

70: cover

The present invention relates to a light collecting device, and in detail, the inclination angle and rotation angle of the reflector can be controlled by tracking the azimuth and altitude angles of the sunlight that change according to the movement trajectory of the sun, thereby maximizing the incident amount of sunlight. It relates to a light collecting device that can adjust the position of the reflector to a position that can be.

Solar energy supplied to the earth is not only very rich in the total amount of energy required by all human beings on the planet, but also very good as a source of pollution-free energy. Recently, the depletion and price of fossil energy sources such as coal and petroleum, and the environmental pollution caused by the use of fossil energy sources are seriously emerging. It is true.

Under these circumstances, research has been conducted to develop a light concentrator that collects sunlight and directly distributes it into a building. In this light concentrator, the accuracy of tracking solar light having different movement trajectories according to date and time is determined accordingly. Efficiency depends.

The conventional light concentrating device for tracking and condensing sunlight is configured with one axis such that a control unit for controlling the position of a reflector reflecting incident sunlight is capable of responding only to a change in either one of an azimuth or an elevation angle of sunlight. there was. The Earth's azimuth and elevation angles are changed by drawing an elliptical orbit by the Earth's rotational movement around the tilted rotation axis. As in the conventional art, the reflector which can only control one axis has a limit that cannot track the movement trajectory of sunlight. Will be.

Therefore, as a result, the light collecting efficiency of the solar light is reduced, so that the fossil energy is used as much as the insufficient amount due to the lack of sunlight, resulting in an increase in energy cost and environmental pollution.

The present invention, by tracking the azimuth and altitude of the sunlight changes according to the movement trajectory of the sun is controlled so that the tilt angle and rotation angle of the reflector is controlled to adjust the position of the reflector to a position that can maximize the amount of incident sunlight An object of the present invention is to provide a light collecting device having an improved structure.

According to an aspect of the present invention, there is provided a light concentrating device for condensing sunlight and delivering light to a light pipe. A first rotating means for rotating the light source, a second axis line intersecting the first axis line as a center of rotation, rotatably installed with respect to the rotating body, a reflecting mirror reflecting incident sunlight, and the reflecting mirror in the second It provides a light concentrating device including a second rotating means for rotating about an axis, and a light converging unit for concentrating the sunlight reflected from the reflector to transmit the sunlight to the light pipe.

In the light collecting device according to the present invention, the first rotating means includes: a driven gear coaxially disposed with the rotating body and fixed to the rotating body, an old synchronous gear gear connected to the driven gear; And it may include a first motor for rotating the drive gear.

In the light collecting device according to the present invention, the second rotating means is coupled to the reflector, the driven pulley disposed on the second axis, the driving pulley for transmitting the rotational force to the driven pulley, the driving pulley and the driven pulley A belt wound around, and may include a second motor for rotating the drive pulley.

In the light collecting device according to the present invention, the light collecting unit may include a Fresnel lens.

The light concentrating device according to the present invention may further include an optical focus lens for adjusting a focal length of the sunlight focused by the light concentrating unit.

The light collecting device according to the present invention may further include an auxiliary reflector for reflecting the sunlight focused by the light collecting unit to a desired position in the light pipe.

In the light collecting device according to the present invention, the cover may further include a cover made of a transparent material covering the reflector.

In the light collecting device according to the present invention, the light-shielding film and the moisture barrier film formed on the cover may further include.

Hereinafter, a preferred embodiment of a light collecting device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing a light collecting device according to an embodiment of the present invention with the front part of the cover cut out, FIG. 2 is a cross-sectional view taken along line II-II of the light collecting device shown in FIG. 1, and FIG. 3 is shown in FIG. 1. Sectional view taken along line III-III of the light collecting device shown in FIG. 4 is an enlarged view of a portion "A" of the cover of the light collecting device shown in FIG.

1 to 3, the light collecting device of the present embodiment includes a base 10, a rotating body 20, a first rotating means, a reflecting mirror 40, a second rotating means, a light collecting part, and an optical focus lens 62. ), An auxiliary reflector 41, and a cover 70 are included.

The base 10 is fixed to the ground, to which other components constituting the light collecting device are attached and serve to support them.

The rotating body 20 uses the vertical axis of the light concentrating device 100 as the first axis 31 so that the rotation angle can be controlled according to the change in the azimuth angle of the sunlight, and the first axis 31 is It is installed as a center of rotation and rotatable.

The first rotating means is for rotating the rotating body 30 about the first axis 31, and includes a driven gear 32, a drive gear 33, a first motor 34. have.

The driven gear 32 has an annular shape, and teeth are formed around the inner circumferential surface thereof. The driven gear 32 is coaxially coupled to the lower surface of the rotating body 20 to support the rotating body 20 and at the same time when the rotational force is transmitted to the driven gear 32, the first axis along with the rotating body 20. It is rotated about 31. In addition, the support ring 35 is provided on the outside of the driven gear 32, the support ring 35 is coupled to a fixed state on the upper surface of the base (10). Since the ball 36 is interposed between the driven gear 32 and the support ring 35, the driven gear 32 and the support ring 35 is a bearing structure that allows a relative rotational movement between the driven gear 32 and the support ring 35. When the rotational force is transmitted to 32, the rotating body 20 which is coaxially coupled thereto is rotated, and the base 10 coupled with the support ring 35 is in a fixed state.

The drive gear 33 is meshed with the driven gear 32 and gear-connected. The rotation center line of the drive gear 33 and the rotation center line of the driven gear 32 are not arranged coaxially, but the teeth formed around the outer circumferential surface of the drive gear and the teeth formed around the inner circumferential surface of the driven gear are engaged with the drive gear 33. Rotational force is transmitted to the driven gear 32.

Preferably, the first motor 34 is a step motor. The step motor means that the rotation angle of the motor shaft is proportional to the number of digital pulses input, and the rotation speed of the motor shaft is equal to the number of digital pulses input for one second. Proportionally, it refers to a motor capable of driving control according to the number and interval of digital pulses input. The shaft of the first motor 34 and the drive gear 33 are coaxially coupled so that the rotational force of the first motor 34 is transmitted to the driven gear 32 via the drive gear 33.

The reflector 40 is connected to the rotating rod 42 attached to the rear surface thereof is installed on the support 21 on the rotating body 20. In order to control the inclination angle of the reflector according to the change in the elevation angle of the sunlight, the support shaft 21 has the central axis of the rotating rod 42 as the second axis 51 and the second axis 51 as the rotation center line. The reflecting mirror 40 is provided so as to be rotatable with respect. The second axis 51 and the first axis 31 intersect, where the term "intersect" means that when two axes are on the same plane, they are arranged to meet only at one point and on different planes. If present, they are not parallel, but include staggered positions. The reflector 40 reflects the incident sunlight and transmits it to the light collecting unit 60 to be described later.

The second rotation means is for rotating the reflector 40 about the second axis 51, the driven pulley 52, the drive pulley 53, the belt 54, the second motor 55 Equipped with.

The driven pulley 52 is coaxially coupled to the rotating rod 42 attached to the rear surface of the reflector 40 and disposed on the second axis 51. Since the driven pulley 52 and the rotating rod 42 are integrally rotatable, the inclination angle of the reflector 40 coupled with the rotating rod 42 can be adjusted by rotating the driven pulley 52. Will be.

The drive pulley 53 serves to transmit rotational force to the driven pulley 52, and is coupled coaxially with the shaft of the second motor 55 to be described later.

The belt 54 is wound around the drive pulley 53 and the driven pulley 52, and the drive pulley is caused by the frictional force generated at the surface where the belt 54 and the respective pulleys 52 and 53 come into contact with each other. The rotational force of 53 is transmitted to the driven pulley 52 side.

The second motor 55 is preferably a step motor, but the driving principle thereof is the same as that described in the first motor 34, and thus a detailed description thereof will be omitted. The second motor 55 is coupled to the support 21 by the bracket 56, the driving force pulley 53, the rotational force of the shaft of the second motor 55 is coupled coaxially with the second motor 55. It is transmitted to the driven pulley 52 via the belt 54 through.

The condensing part is for condensing sunlight reflected from the reflector 40 and is provided in the rotating body 20. A Fresnel lens 61 may be used as the light collecting part, and a Fresnel lens 61 having a short focal length (for example, about 220 mm) may be used to reduce the height of the entire light collecting device. Do. As is well known, a Fresnel lens is one of condensing lenses, which is divided into several bands in order to reduce the thickness of the lens itself, and has a small aberration by having a prism action on each band.

The optical focus lens 62 is used to adjust a focal length of sunlight focused by the Fresnel lens 61, and generally uses a convex lens. In order for the focused solar light to be incident on the light pipe (not shown) to be connected to the light collecting device without loss, the angle formed between the incident light and the inner wall of the light pipe is the limit angle (for example, the light used in the present embodiment). Pipes should be within 27.6 °). In the case of focusing sunlight using a shorter fossil lens 61, the effect of focusing sunlight can be achieved within a short distance. At the incident position, incident may occur outside the limit angle (eg, 27.6 °). Therefore, the optical focus lens 62 having a focal length longer than the focal length of the Fresnel lens 61 used as the light collecting portion is installed on the optical path after the Fresnel lens 61, so that the angle of sunlight incident on the light pipe By reducing, it is possible to minimize the loss of sunlight incident on the light pipe. However, the limit angle (for example, 27.6 °) may be changed according to the type of light pipe.

The auxiliary reflector 41 is provided on the optical path after the Fresnel lens 61 and the optical focus lens 62, and a mirror made of the same material as the reflector 40 is used. By adjusting the installation position of the auxiliary reflector 41 so that sunlight is incident on an optical pipe (not shown) to be connected to the light collecting device while minimizing the loss of sunlight focused by the Fresnel lens 61 and the optical focus lens 62. Fix it to the base 10 and install it.

On the other hand, in the present embodiment, the light pipe connecting member 11 is further provided to connect the light pipe (not shown) for transmitting the solar light focused in the light collecting device to another system. The light pipe connecting member 11 is installed on the side of the base 10, and the solar light focused by the Fresnel lens 61 and reflected by the auxiliary reflector passes through the light pipe connecting member 11. It has a cylindrical pipe shape to be incident on (not shown). The light pipe connecting member 11 serves to connect the base 10 and the light pipe as described above, and also serves to cool the sunlight as described below. The temperature of sunlight incident on the light pipe to be connected to the light collecting device is preferably within 140 ° C. Therefore, when the sunlight collected by the Fresnel lens 61 is a high temperature of more than 140 ℃, by installing the light pipe connecting member 11 between the auxiliary reflecting mirror 41 and the light pipe to be connected to the light collecting device The transmission path can be extended, and the effect of cooling the sunlight to a suitable temperature to be incident on the light pipe by natural cooling while passing through the extended transmission path can be obtained. On the inner wall of the light pipe connecting member 11, a total reflection film made of aluminum or silver or a total reflection film made of an aluminum thin film may be attached to the PET film to minimize the loss of incident sunlight.

The cover 70 uses a transparent acrylic to improve the transmittance of the incident sunlight, and covers the reflector 40 so that the reflector 40 is not exposed to the external environment. When the light collecting device is installed such that the reflector 40 is exposed to the external environment without the cover 70, the external force due to the wind is generated due to the large cross-sectional area of the reflector 40 in the windy weather. Due to the external force caused by the wind, an overload is generated which is out of the rated capacity of the first motor 34 and the second motor 55 appropriately selected according to the weight of the reflector 40, so that the reflector 40 is inclined. In some cases, the angle and the rotation angle may not be controlled. When the cover 70 is installed in the light collecting device, the above-described risks may be eliminated, and the first motor 34 and the second motor 55 may be removed. The service life of can also be extended.

In the present embodiment, as shown in FIG. 4, the light concentrating device is provided with a UV blocking film 71 and a moisture barrier film 72 on the cover 70.

The UV blocking film 71 is to prevent the cover 70 from being discolored by sunlight, and is formed in a film form by applying a known UV blocking solution to the outer surface of the cover 70. Even if the cover is made of transparent acrylic in the initial stage of installation, the cover may be discolored yellow due to ultraviolet rays when exposed to sunlight for a long time. The cover discolored in yellow lowers the transmittance of sunlight by the discolored concentration, resulting in a decrease in the efficiency of the light collecting device as a whole. Therefore, the transparency of the acrylic can be maintained by the UV blocking film 71 formed on the cover 70, it is possible to obtain the effect of operating a high efficiency light concentrating device steadily.

The moisture barrier 72 is formed in the form of a film by applying a known moisture barrier in order to prevent the moisture on the inner surface of the cover 70. Due to the temperature difference between the inside and the outside of the cover 70, the path of sunlight incident on the light collecting device may be scattered by the water droplets formed on the inner surface of the cover 70, and the refractive angle of the sunlight may also be changed by hitting the water droplets. Therefore, by applying the moisture barrier film 72 to the inner surface of the cover 70, it is possible to increase the incident amount of sunlight to obtain the effect of improving the efficiency of the light collecting device as a whole.

Hereinafter, an example of an operation process for condensing sunlight while the light concentrating device 100 of the present embodiment configured as described above tracks the altitude and azimuth angle of the sunlight will be described.

According to the latitude and longitude of the place where the light concentrating device 100 is to be installed, the movement trajectory of the solar light may be preliminarily dataed for each day of the year and daily time. The movement trajectory data of sunlight by date and time is stored in a controller (not shown), and the controller generates a digital pulse signal corresponding to the data, and generates a digital pulse signal corresponding to the change in the azimuth and elevation angles of the sunlight. When transmitted to the first motor 34 and the second motor 55, the inclination angle and the rotation angle of the reflector 40 can be controlled to be in a position that can maximize the incident amount of sunlight.

First, the data corresponding to the azimuth of the previously inputted movement trajectory data of the sunlight are transmitted to the first motor 34 to track the change in the azimuth of the sunlight. The rotation angle of the shaft of the first motor 34 is determined in proportion to the number of pulse signals added to the first motor 34, and the rotational force of the first motor 34 is driven through the drive gear 33. ), The rotating body 20 coupled with the driven gear 32 and the reflecting mirror 40 installed on the rotating body are rotated using the first axis 31 as the center of rotation. Therefore, the rotation angle of the reflector 40 can be controlled in response to the change in the azimuth angle of sunlight.

In addition, the pulse signal corresponding to the azimuth angle of the sunlight is transmitted to the first motor 34 and at the same time the data corresponding to the altitude angle of the movement trajectory data of the sunlight, which is inputted so that the change of the altitude angle of the sunlight can be digitally detected. The pulse signal is transmitted to the second motor 55. Like the first motor 34, the rotation angle of the shaft of the second motor 55 is determined in proportion to the number of pulse signals added to the second motor 55, and the rotational force of the second motor 55 is driven by a driving pulley ( 53) and the rotating rod 42 and the reflector 40 coupled to the driven pulley 52 through the belt 54, are rotated using the second axis 51 as the center of rotation. . Therefore, the tilt angle of the reflector 40 can be controlled in response to the change in the elevation angle of sunlight.

As described above, after adjusting the rotation and inclination positions of the reflector 40 so as to maximize the amount of incident sunlight, the light reflected by the reflector 40 is rotated. Focusing is performed using a Fresnel lens 61 provided in the whole 20. In the case of using the Fresnel lens 61 having a short focal length, the focal length of the sun is adjusted by using the optical focus lens 62 to reduce the loss of sunlight that may occur in the process of being incident on the light pipe to be installed in the light collecting device. do. The solar light focused by the Fresnel lens 61 and the optical focus lens 62 is incident on an optical pipe to be connected to the light collecting device, and is transmitted to a system such as an illumination device in which the sunlight is used.

Using the light concentrating device 100 of the present embodiment configured as described above, it is possible to control the inclination angle and the rotation angle of the reflector according to the azimuth and altitude angle of the solar light, so that the change of the solar light while drawing an elliptical orbit The incident amount of sunlight can be maximized while tracking the movement trajectory. Therefore, by using a light collecting device having an improved light condensing efficiency, it is possible to save a large amount of electric energy when used in an underground parking lot or a tunnel that requires lighting even during the daytime.

In addition, by using a light collecting device having improved light condensing efficiency directly connected to the indoor lighting source of the building, it can not only reduce the electric energy but also provide a pleasant office environment, and can also have side effects such as increasing productivity of the office worker.

In this embodiment, the drive gear 33 has a configuration in which the driven gear 32 is inscribed. However, the drive gear has a configuration in which the driven gear is circumscribed (the teeth are formed on the outer circumferential surface of the driven gear and the drive gear is formed on the teeth. Interlocking configuration).

In the present embodiment, a Fresnel lens 61 having a relatively short focal length (for example, about 200 mm) was used. According to the size of the entire system of the light concentrating device, a Fresnel lens having a different focal length can be used. A convex lens having the same function of condensing as a Fresnel lens may be used instead.

Unlike the present embodiment, when using a long fossil lens or a convex lens having a long focal length, which is designed to allow sunlight to be incident within a limit angle of incidence of the light pipe, the optical focus lens 62 is not used. A light collecting device can be implemented. However, when the Fresnel lens or the convex lens having a long focal length is used in order not to use the optical focus lens 62, the size of the entire light concentrator system increases in order to secure the focal length.

In the present embodiment, the cover 70 is made of transparent acrylic, but can be made of any transparent material that can maintain a certain degree of robustness, as long as the transmittance of incident sunlight is not reduced. For example, a cover may be manufactured using glass.

Although the preferred embodiments and modifications have been described above, the light concentrating device according to the present invention is not limited to the above-described examples, and various modifications and combinations thereof may be made within the scope not departing from the technical spirit of the present invention. A condenser of the type can be embodied.

The light concentrating device of the present invention can control the tilt angle and rotation angle of the reflector to a position where the incident light can be maximized, thereby replacing electricity or fossil energy by using a light concentrating device having improved light condensing efficiency. Not only can it use pollution-free natural energy, but it also has the effect of reducing costs.

Claims (8)

In the light collecting device for condensing sunlight and transmitting it to the light pipe, Base; A rotating body rotatably installed with respect to the base using a first axis as a center of rotation; First rotating means for rotating the rotating body about the first axis; A reflecting mirror installed to be rotatable with respect to the rotating body using a second axis line intersecting the first axis line as a center of rotation, and reflecting incident sunlight; Second rotating means for rotating the reflecting mirror about the second axis; And And a light collecting unit for focusing the sunlight reflected from the reflector and transferring the sunlight to the light pipe. The method of claim 1, The first rotating means, A driven gear disposed coaxially with the rotating body and fixed to the rotating body; A drive gear connected to the driven gear; And Condensing device comprising a first motor for rotating the drive gear. The method according to claim 1 or 2, The second rotating means, A driven pulley coupled to the reflector and disposed on the second axis; A drive pulley for transmitting rotational force to the driven pulley; A belt wound around the driving pulley and the driven pulley; And Condensing device comprising a second motor for rotating the drive pulley. The method of claim 1, The light collecting part includes a Fresnel lens. The method according to claim 1 or 4, And a light focus lens for adjusting a focal length of sunlight focused by the light collecting unit. The method of claim 1, And a sub-reflecting mirror for reflecting the sunlight focused by the light collecting unit to a desired position in the light pipe. The method of claim 1, Condensing device further comprises a cover of a transparent material covering the reflector. The method of claim 7, wherein A light collecting device further comprising a sunscreen and a moisture barrier formed on the cover.

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