WO2016167510A1

WO2016167510A1 - Unpowered sunlight tracking device

Info

Publication number: WO2016167510A1
Application number: PCT/KR2016/003596
Authority: WO
Inventors: 김홍래
Original assignee: 김홍래
Priority date: 2015-04-11
Filing date: 2016-04-06
Publication date: 2016-10-20

Abstract

An unpowered sunlight tracking device may be provided, the unpowered sunlight tracking device comprising: a barrel-shaped housing, through which light can pass; a fixing means provided inside the housing; a shaft, which penetrates the housing along the direction of extension of the housing, and in which a heat medium fluid can flow; a first guide capable of rotating about the shaft; a reflection unit connected to the first guide to be able to rotate about the shaft together with the first guide, thereby reflecting sunlight towards the shaft; a bimetal, which is fixedly installed on the fixing means to be able to deform, and which is made of two metal plates that have different heat transfer rates; and a second guide for rotating the first guide according to the amount of deformation of the bimetal.

Description

[Revision 14.04.2016 by Rule 26] No-power solar tracking device

The present invention relates to a non-powered solar tracking device.

As fossil fuels are depleted and environmental pollution due to fossil fuels becomes more serious, interest in eco-friendly and semi-permanent renewable energy is increasing day by day. Representative examples of such environmentally friendly energy include solar power generation, wind power generation, tidal or hydroelectric power generation. In particular, solar energy has high thermal energy and thus has high utility value.

In general, solar energy is energy used to collect sunlight using a lens or reflector. However, since the sun is constantly changing altitude and azimuth due to the rotation and rotation of the earth, it is necessary to continuously change the position of the collector that receives sunlight according to the position of the sun to obtain high efficiency. To this end, research on a tracking device that can track sunlight has been recently conducted.

The tracking device is a device that can adjust the position of the reflector according to the movement of the sun in order to improve the power generation efficiency. In the past, a device capable of adjusting the position of the reflector by electric energy using a predetermined transmission device has been used. A tracking device using bimetal has been proposed.

Bimetal refers to a lamination of two kinds of thin metals having different coefficients of thermal expansion, that is, their degree of expansion and contraction change with temperature.

Patent document 1 (Korean Patent No. 1412533) discloses a device capable of tracking sunlight using bimetal. However, the device disclosed in Patent Literature 1 has a problem in that sunlight cannot be continuously tracked due to the nature of the bimetal returning to its original state when no energy is supplied. Specifically, the apparatus disclosed in Patent Literature 1 tracks sunlight and deforms and returns to the initial state, and then deforms again to return to the initial state.

Embodiments of the present invention have been proposed to solve the above problems, to provide a non-powered solar tracking device that can continuously track the sun using one axis.

In addition, it is to provide a non-powered solar tracking device that can be installed and manufactured at low cost.

In addition, to provide a non-powered solar tracking device that can increase the operation reliability.

It is also an object of the present invention to provide a non-powered solar tracking device that can be widely used.

[Measures to solve the problem]

In one embodiment of the present invention, a cylindrical housing through which light can pass; Fastening means provided in the housing; An axis passing through the housing along an extension direction of the housing and provided with an energy conversion means therein; A first guide rotatable about the axis; A reflector connected to the first guide and rotatable with the first guide about the axis and reflecting sunlight toward the axis; A bimetal deformably fixed to the fixing means and formed of two metal plates having different heat transfer rates; And a second guide that rotates the first guide according to the amount of deformation of the bimetal.

In addition, the bimetal is elongated in the axial extension direction, the central portion is fixed to both ends are bent in the horizontal direction, the second guide wraps the bimetal, the end portion of the bimetal and the ring portion formed to be slidably movable inside It may provide a non-powered solar tracking device including a head portion for applying an external force to the first guide in accordance with the movement of the ring portion.

In addition, the bimetal is fixed in the upper portion, the lower portion is bent in the horizontal direction, the second guide includes a rotating bar that is fitted between the pair of bimetal, and both sides of the rotating bar is bent downward to form a head portion To provide a non-powered solar tracking device.

In addition, the first guide may provide a non-powered solar tracking device including a wing that is connected to and fixed to the head of the second guide.

In addition, the wing portion may have a concave shape toward the reflecting portion, the back of the wing portion may provide a non-powered solar tracking device is formed as an auxiliary reflecting surface for reflecting back the light reflected from the reflecting portion.

In addition, the bimetal has a fixed upper portion, the lower portion is bent in a horizontal direction, spaced apart, a pair is provided, the second guide is connected to the bimetal, move in accordance with the movement of the bimetal, According to the movement, it is possible to provide a non-powered solar tracking device in which the first guide rotates.

In addition, the first guide may be a pulley having a predetermined groove, the second guide may provide a non-powered solar tracking device is formed of a ball chain having a ball of a size corresponding to the groove of the pulley.

In addition, the bimetal is provided with a pair, and the two metal plates constituting the bimetal, the inner metal plate of the bimetal close to the axis is provided with a thermal expansion coefficient greater than the outer metal plate of the bimetal far from the axis provides a non-powered solar tracking device. can do.

In addition, the bimetal may provide a non-powered solar tracking device in which the outer surface far from the shaft is a black body surface and the inner surface close to the shaft is a total reflection surface.

In addition, the second guide may provide a non-powered solar tracking device which is a cam that converts the linear movement of the bimetal into a rotational movement and transmits it to the first guide.

In addition, the reflector may provide a non-powered solar tracking device further comprising a main reflecting surface reflecting sunlight and a support portion to fix the curvature and shape of the main reflecting surface.

In addition, the housing may provide a non-powered solar tracking device that is a vacuum tube.

In addition, it is possible to provide a non-powered solar tracking device including a bearing provided in a form surrounding the shaft.

In addition, between the shaft and the bearing may provide a non-powered solar tracking device further comprises an insulating bushing for blocking the thermal interference of the shaft.

In addition, it is possible to provide a non-powered photovoltaic tracking device with weight added to the first guide.

In addition, the energy conversion means may provide a non-powered solar tracking device that is a heat medium fluid flowing through the shaft.

In addition, the energy conversion means may provide a non-powered solar tracking device that is a thermoelectric element provided inside the shaft.

The non-powered solar tracking device according to the embodiments of the present invention does not include a separate power supply device, and there is an effect capable of operating without power.

In addition, since one axis is provided, there is an effect capable of continuously tracking the sun.

In addition, since the installation is simplified, there is an effect that can be installed and manufactured at a low cost.

In addition, since the bimetal is provided inside the sealed housing and is not affected by the external environment, there is an advantage of increasing the operation reliability.

In addition, there is an effect that can be widely used in various fields by changing the condensing ratio.

1 is a perspective view showing a non-powered solar tracking device according to an embodiment of the present invention.

2 is a side view of FIG. 1.

3 is an exploded perspective view of portion A of FIG. 1.

4 is a diagram illustrating a state in which the non-powered solar tracking device of FIG. 1 operates in response to a change in solar azimuth angle.

5 is a perspective view showing a non-powered solar tracking device according to another embodiment of the present invention.

6 is a side view of FIG. 5.

7 is an exploded perspective view of a portion B of FIG. 5.

FIG. 8 is a diagram illustrating a state in which the non-powered solar tracking device of FIG. 5 operates in response to a solar azimuth change.

9 is a perspective view showing a non-powered solar tracking device according to another embodiment of the present invention.

10 is a side cross-sectional view cut near the ball chain of FIG. 9.

FIG. 11 is a partially enlarged perspective view of the ball chain and pulley of FIG. 9. FIG.

12 is a side view of FIG. 11.

13 is a cross-sectional view showing the configuration of the pulley of FIG.

FIG. 14 is a diagram illustrating a state in which the non-powered solar tracking device of FIG. 9 operates in response to a change in solar azimuth angle.

15 is a comparison graph of a solar collector to which a solar tracking device according to an embodiment of the present invention is applied and a conventional solar collector.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a perspective view showing a non-powered solar tracking device according to an embodiment of the present invention, Figure 2 is a side view of Figure 1, Figure 3 is an exploded perspective view of the portion A of FIG.

1 to 3, the non-powered solar tracking device 10 according to an embodiment of the present invention includes a cylindrical housing 100 through which light can pass, and an interior of the housing 100. A shaft 120 which passes in the direction (x-axis direction in FIG. 1) passing through the fixing means 110 and the bottom surface of the housing 100 provided therein, and through which a nut fluid or a thermoelectric element may be disposed. And a first guide 130 rotatable about the shaft 120, a reflector 140 connected to the first guide 130 and rotatable about the shaft 120, and the fixing means 110. The bimetal 150 is fixedly installed, and the second guide 160 rotates the first guide 130 according to the deformation amount of the bimetal 150.

The housing 100 is formed of a transparent material through which light can pass, and can provide a controlled environment. For example, the housing 100 may be a vacuum tube and may have a cylindrical shape having two bottom surfaces. When the housing 100 is provided as a vacuum tube, the inside of the housing 100 may not be affected by an external environment such as air temperature, air pressure, and humidity.

The fixing means 110 is a component provided in the housing 100 to position the bimetal 150 at a predetermined position inside the housing 100. For example, the fixing means 110 may include a frame 111 that may be fixed to an inner side surface of the housing 100, one or more extensions 112 extending from the frame 111 toward the shaft 120, and extending. It may include a fixing portion 113 provided at the end of the portion 112 to which the bimetal 150 may be fixed. In this case, the fixing part 113 may further include a fastening hole 114 for connecting with the bimetal 150. In addition, the fixing part 113 may have a shorter length than the frame 111.

The frame 111 is formed to correspond to the cross-sectional shape of the housing 100 by being connected to the straight portion 111a extending in the extending direction of the housing 100, that is, the X-axis direction, and the straight portion 111. It may be composed of a ring portion (111b) in close contact with the inner surface of the 100.

The frame 111, the extension part 112, and the fixing part 114 may be integrally formed, and the shape of the fixing means 110 is not limited thereto. For example, the frame 111, the extension part 112, and the fixing part 114 may be provided separately and connected to each other, and the ring part 111b may be omitted or the fixing part 113 may be omitted and the extension part ( The bimetal 150 may be directly connected to 112, and may have a structure other than the structure illustrated in the present embodiment.

The shaft 120 may pass through the center of the bottom surface of the housing 100 in the X-axis direction, and may have a shape having a predetermined thickness. At this time, the shaft 120 may be provided with a hollow inside so that the heat-mediated fluid can flow, it may extend through the housing 110 to the outside.

Heat-mediated fluid flows into the shaft 120 and absorbs sunlight and may be heated. Alternatively, a thermoelectric element may be disposed inside the shaft 120, and a predetermined pipe for cooling the thermoelectric element may be further configured, and thus the power generation may be performed by the thermoelectric element absorbing sunlight and being heated. In this embodiment, the heat-mediated fluid flows inside the shaft 120 as an example.

Here, the heat medium fluid flowing inside the shaft 120 or the thermoelectric element provided inside the shaft 120 absorbs sunlight and accumulates or generates predetermined energy, and may be referred to as energy conversion means. That is, it can be said that the energy conversion means is provided inside the shaft 120.

The first guide 130 may be provided to be rotatable about the shaft 120, and transmits the movement of the bimetal 150 to the reflector 140 to rotate the reflector 140. Here, the bearing 170 may be formed in the lower portion of the first guide 130 to smoothly rotate the first guide 130. The bearing 170 may be formed to be fitted to the shaft 120, and the insulating bushing 180 for blocking thermal interference of the shaft 120 is provided between the shaft 120 and the bearing 170. Can be. In the present embodiment, the bearing 170 is connected to the first guide 130 as an example, but the bearing 170 is connected to the reflector 140, and the first guide 130 is the reflector 140. It may be provided in the form formed in. That is, the bearing 170 is provided so that the first guide 130 and the reflector 140 can be smoothly rotated about the shaft 120.

The first guide 130 is disposed between the shaft 120, the bimetal 150, and the second guide 160, and rotates about the shaft 120 by an external force applied from the second guide 160. Can be. The first guide 130 and the reflector 140 may be directly or indirectly connected. When the first guide 130 is rotated, the reflector 140 may also rotate together.

The first guide 130 may have a shape in which the head portion 162 of the second guide 160 to be described later may be fitted, whereby the first guide 130 as the second guide 160 moves. Can be rotated. For example, the first guide 130 may include a pair of wings 131 extending in both directions from the shaft 120, and a valley 134 may be provided between the wings 131. have. That is, the first guide 130 may be formed in a shape similar to '3'.

The pair of wings 131 may have a curved shape concave toward the reflector 140. Here, the upper surface of the first guide 130 functions as a contact surface interlocking with the second guide 160, and the lower surface of the first guide 130 reflects light reflected from the reflector 140 again. 132 may function. In this case, there is an advantage that the light collecting efficiency can be further increased through the concave auxiliary reflective surface 132.

Here, the first guide 130 may be formed in a relatively small size compared to the reflector 140, thereby allowing the reflector 140 to be greatly rotated even when the bimetal 150 is deformed in small amounts.

The first guide 130 may be provided with a weight 133 for adding weight to the side of the first guide 130 around the shaft 120. Since the weight 133 is provided, even when only a weak force is applied from the second guide 160, a large moment may be generated on the side of the first guide 130, so that the reflector 140 may be easily rotated.

The reflector 140 may be connected to the first guide 130 and provided to be rotatable about the shaft 120. The reflector 140 may include a main reflecting surface 141 reflecting sunlight toward the axis 120 and a support 142 supporting the main reflecting surface 141. The main reflective surface 141 may be concave toward the axis 120, and the support 142 may have a sector shape having a flat center angle to fix the curvature and the shape of the reflector 140. . At this time, the curvature of the main reflective surface 141 may be changed according to the angle of the support 142.

The bimetal 150 may be deformably fixed to the fixing means 110. In this case, the bimetal 150 may be formed of two metal plates having different heat transfer rates, and may have a rectangular cross section. For example, the bimetal 150 may have a rectangular cross section extending longer in the X-axis direction.

In the present embodiment, a pair of bimetals 150 will be described as an example in which faces for absorbing sunlight are disposed to face outwards. In this case, there is an advantage that the bimetal can react even if sunlight is emitted from either side.

The pair of bimetals 150 may be fixed to the fixing means 110 by a fastening means 151 such as a bolt, or may be connected to each other, and the two bimetals 150 may be formed at regular intervals to allow the fastening means 151 to pass therethrough. More fastening holes 152 may be included. In the present exemplary embodiment, four fastening holes 152 are formed in the bimetal 150, but the present disclosure is not limited thereto.

Specifically, the fastening holes 152 at both end sides of the bimetal 150 may be used for joining a pair of bimetals 150 to each other, and the fastening hole 152 at the center side may be fastening means 110. It is configured to correspond to the fastening hole 114 of the bimetal 150 may be used for the purpose of coupling to the fixing means (110). The fastening means 151 may include a washer, a sleeve, a bolt, and a nut, but is not limited thereto.

Here, the bimetal 150 may be disposed such that the metal plate having a higher thermal expansion coefficient faces the center side, that is, the fixing part 113 side. As a result, when the bimetal 150 absorbs and deforms thermal energy, the bimetal 150 may be bent toward the direction in which sunlight is provided.

The outer surface of the bimetal 150 may be treated with a low reflective black body by a technique such as titanium vacuum deposition to absorb sunlight well, and the rear surface may be a mirror that can be totally reflected. That is, when the bimetals 150 are provided in pairs, the opposite inner surfaces of the bimetals 150 may be total reflection surfaces. The total reflection surface can prevent mutual thermal interference due to radiation between the pair of bimetals 150. In the present exemplary embodiment, the inner surface of the bimetal 150 is formed as a total reflection surface, but the spirit of the present invention is not limited thereto. For example, a highly elastic insulating material may be provided between the pair of bimetals 150 to block heat transfer.

The bimetal 150 is bent as it absorbs solar heat. Specifically, since the outer surface of the bimetal 150, that is, the black body treated surface, may absorb sunlight well, the deformation amount of the bimetal 150 may be increased. As the solar light is absorbed, the bimetal 150 is bent according to the difference in thermal expansion rates of the two metals forming the bimetal 150. At this time, the bimetal 150 is a metal plate having a greater thermal expansion coefficient is disposed toward the center side, that is, the fixing portion 113, it is concave concave toward the sunlight.

In this embodiment, the bimetals 150 are provided in pairs, and when sunlight is irradiated toward either 150a of the pair of bimetals 150, the other bimetals 150b absorb energy well. It does not thermally expand or only thermally expand by a relatively small amount. In this case, since the other bimetal 150b is connected by any one of the bimetals 150a and the fastening means 151, the other bimetals 150b are deformed together according to the deformation of any one of the bimetals 150a.

In the present embodiment, the bimetal 150 is provided in a form in which the length of the same direction (X-axis direction) as the extension direction of the shaft 120 is longer than the length of the other direction (Z-axis direction). In addition, since the center of the bimetal 150 is fixed to the fixing part 113, the bimetal 150 may be bent in the horizontal direction at both ends with respect to the center.

The second guide 160 may rotate the first guide 130 according to the deformation amount of the bimetal 150. The bimetal 150 is fixed to the fixing means 110 and is bent, and the second guide 160 may be configured to rotate together according to the degree to which the bimetal 150 is bent. Specifically, the bimetal 150 is bent in the left and right directions based on FIG. 2, and the second guide 160 converts the linear motion of the bimetal 150 into a rotational motion to transmit the bimetal 150 to the first guide 130. It may be a cam. In this case, the second guide 160 may be made of a Teflon material having a low thermal conductivity and high heat resistance, but is not limited thereto.

The second guide 160 is directly connected to the bimetal 130, so that the first guide 130 rotates according to the change of the bimetal 130, and the connection between the bimetal 130 and the first guide 130 is performed. Can be used as a structure. Therefore, the second guide 160 may be provided on the first guide 130 to have a structure interlocked with the bimetal 130.

Specifically, the second guide 160 includes a ring portion 161 surrounding the bimetal 150, and a head portion 162 in contact with the first guide 130 to rotate the first guide 130. can do. In this case, the head part 162 may have a shape corresponding to the top shape of the first guide 130 so that the second guide 160 is interlocked with the first guide 130. In detail, the head 162 is connected to the first guide 130 and rotates together with the first guide 130. For example, when the first guide 130 has a pair of wings 131, the head portion 162 may be formed in a wedge shape that fits into the valley portion 134, and the head portion 162 and The wing 131 may be adhesively fixed.

The ring portion 161 is rotated as the bimetal 150 is bent, and the rotation center may be a contact portion between the head portion 162 and the first guide 130. In detail, the ring portion 161 may be formed in an elliptic shape or a cam shape having a predetermined curvature and may be fitted in a shape surrounding the bimetal 150. When the bimetal 150 is bent, the edge portion of the bimetal 150 pushes the inner surface of the ring portion 161, whereby the ring portion 161 is in a tangential direction of the shaft 120 (left and right directions in FIG. 2). External force is applied. Since the head portion 162 is connected to the first guide 130, the external force acts as a moment to rotate the entire first guide 130. Therefore, the bimetal 150 is slid along the inner surface of the ring portion 161 when bent, and the first guide 130 rotates around the contact portion of the head portion 162 and the first guide 130 as a whole. do.

In the present embodiment, a method in which the head portion 162 is bonded to the valley portion 134 of the first guide 130 is fixed as an example, but the coupling method of the second guide 160 and the first guide 130 is illustrated. Is not limited to this. For example, a lower portion of the second guide 160 may be fitted and fixed to a portion of the first guide 130.

FIG. 4A is a side view of the solar tracking device, and FIG. 4B is a plan view of the solar tracking device. Referring to FIG. 4, the shape of the bimetal 150 according to the change of the position of the sun and the states of the first guide 130, the reflector 140, and the second guide 160 may be confirmed.

In detail, the solar tracking device 10 is disposed such that the sun is located on one side of the solar tracking device 10 when the morning is based on the noon, and the sun is located on the other side of the solar tracking device 10 when the afternoon occurs. Can be. In the present embodiment, the sun is positioned on the left side of the solar tracking device 10 in the morning, and the example is positioned on the right side in the afternoon.

The bimetal 150 may bend toward the direction in which the sun is located. Specifically, as described above, a pair of bimetals 150 may be provided, and each of the bimetals 150 may be installed such that a metal plate having a high thermal expansion rate is positioned inside. Since it is arrange | positioned toward the phosphorus fixing part 113, it becomes curved concave toward sunlight.

In addition, when sunlight is irradiated toward any one 150a of the pair of bimetals 150, the other bimetals 150b do not absorb energy well, and thus are not thermally expanded or only by a relatively small amount. Thermal expansion. In this case, since the other bimetal 150b is connected by any one of the bimetals 150a and the fastening means 151, the other bimetals 150b are deformed together according to the deformation of any one of the bimetals 150a.

Since the bimetal 150 is not thermally expanded by sunlight before sunrise, the bimetal 150 is maintained at noon in FIG. 4.

In the morning, since the sun is located on the left side of the housing 100, any one of the bimetals 150a can absorb sunlight better, so that the entire bimetals 150 concave concave leftward toward the sun. .

The second guide 160 is connected to both end portions of the bimetal 150, and as described above, the bimetal 150 pushes and rotates the annular portion 162 of the second guide 160 so that the second guide 160 is rotated. 160 moves together with the bimetal 150 in the direction in which the bimetal 150 is bent, so that the first guide 130 and the reflector 140 coupled to the second guide 160 may be the shaft 120. Rotate around. That is, when the bimetal 150 is bent to the left side, the first guide 130, the second guide 160, and the reflector 140 rotate in the counterclockwise direction. As a result, the main reflection surface 141 of the reflection unit 140 may be positioned to face the sun.

At noon, the altitude of the sun becomes higher and higher, and the angle of incidence of sunlight incident on any one of the bimetals 150a becomes smaller. That is, since the amount of heat transmitted to any one of the bimetals 150a is reduced, the amount of thermal expansion of any one of the bimetals 150a is gradually reduced. Accordingly, the rotation angle of the reflector 140 also becomes small.

At noon, the sun supplies the same energy to both bimetals 150a and 150b, so that the amount of thermal expansion of both bimetals 150a and 150b is the same, so that the bimetals 150 do not bend in any direction. The unit 140 may face upward.

In the afternoon, since the sun is located on the right side of the housing 100, any one of the bimetals 150b can absorb sunlight better, so that the entire bimetals 150 concave in the right direction towards the sun. Bent.

The second guide 160 is connected to both end portions of the bimetal 150, and as described above, the bimetal 150 pushes and rotates the annular portion 162 of the second guide 160 so that the second guide 160 is rotated. 160 moves together with the bimetal 150 in the direction in which the bimetal 150 is bent, so that the first guide 130 and the reflector 140 coupled to the second guide 160 may be the shaft 120. Rotate around. That is, when the bimetal 150 is bent to the right, the first guide 130, the second guide 160, and the reflector 140 are rotated in the clockwise direction. As a result, the main reflection surface 141 of the reflection unit 140 may be positioned to face the sun.

The above description is an ideal situation when the sensitivity of the bimetal 150 is very excellent, and in fact, since the bimetal 150 takes time to absorb and thermally expand energy transmitted from the sun, the reflector rather than the movement of the sun. This may be done in a somewhat late fashion. In this case, in order to increase the light collecting efficiency, the reflector 140 may be rotated in a clockwise direction at an angle about a virtual line connecting the center of the first guide 130 and the center of the axis 120.

The non-powered solar tracking device 10 according to the embodiment of the present invention as described above does not include a separate power supply device, and the first guide 130 and the reflector 140 according to the direction in which the bimetal 150 is bent. And the second guide 160 to rotate, there is an effect that can be operated with no power.

In addition, since the first guide 130, the second guide 160 and the reflector 140 is connected to one axis 120 and rotates, there is an effect capable of continuously tracking the sun.

In addition, because one shaft 120 is provided to simplify the installation, there is an effect that can be installed and manufactured at a low cost.

In addition, since the bimetal 150 is provided inside the sealed housing 100 and is not affected by the external environment, there is an advantage of increasing the operation reliability.

In addition, by adjusting the angle of the reflector 140, by changing the light condensing ratio, there is an effect that can be used in various fields.

Hereinafter, a non-powered solar tracking device according to another embodiment of the present invention will be described with reference to FIGS. 5 to 8. However, other embodiments have a difference in the form of connection between the bimetal and the second guide as compared to the embodiment, and thus the description will be mainly focused on the differences. In addition, in the following description, in order to avoid duplicate description, detailed descriptions of the components will be omitted, and if necessary, the preceding numerals will be replaced with 2, 3, and 4 respectively. For example, the housing of the non-powered solar tracking device 20 corresponding to the housing 100 of the non-powered solar tracking device 10 may be represented by reference numeral 200. For example, the non-powered solar tracking device 20 includes a housing 200, a fixing means 210, a shaft 220, a first guide 230, a reflector 240, a bimetal 250, and a second guide. 260, bearing 270, and thermal insulation bushing 280.

5 is a perspective view showing a non-powered solar tracking device according to another embodiment of the present invention, Figure 6 is a side view of Figure 5, Figure 7 is an exploded perspective view of the portion B of FIG.

5 to 7, the non-powered solar tracking device 20 according to another embodiment of the present invention is a cylindrical housing 200 through which light can pass, and fixing means provided in the housing 200. 210 and a shaft 220 passing in the direction (x-axis direction in FIG. 5) passing through the bottom surface of the housing 200 and passing through the fruiting fluid therein, and rotating about the shaft 220. Possible first guide 230, a reflector 240 connected to the first guide 230 and rotatable about an axis 220, a bimetal 250 fixed to the fixing means 210, and a bimetal It includes a second guide 260 for rotating the first guide 230 in accordance with the deformation amount of (250).

The bimetal 250 may be deformably fixed to the fixing means 210. In this case, the bimetal 250 may be formed of two metal plates having different heat transfer rates, and may have a rectangular cross section. For example, the bimetal 250 may have a rectangular cross section extending longer in the Z-axis direction.

In this embodiment, a pair of bimetals 250 will be described as an example in which faces for absorbing sunlight from each other are disposed to face outwards. In this case, there is an advantage that the bimetal can react even if sunlight is emitted from either side.

The pair of bimetals 250 may be fixed to the fixing means 210 by fastening means 251 such as bolts or may be connected to each other, and two or more bimetals 250 may be formed at regular intervals to allow the fastening means 251 to pass therethrough. It may include more fastening holes 252. In the present exemplary embodiment, four fastening holes 252 are formed in the bimetal 250, but the present disclosure is not limited thereto.

Specifically, the fastening hole 252 on the upper side of the bimetal 250 is configured to correspond to the fastening hole 214 of the fixing means 210 to be used for coupling the bimetal 250 to the fixing means 210. Can be. In addition, the fastening hole 252 at the lower side of the bimetal 250 may be used to join the pair of bimetals 250 to each other. The fastening means 251 may include a washer, a sleeve, a bolt, and a nut, but is not limited thereto.

In this case, the bimetal 250 may be disposed such that the metal plate having a higher thermal expansion coefficient faces the fixing part 213. As a result, when the bimetal 250 absorbs and deforms thermal energy, the lower portion of the bimetal 250 may be bent toward the direction in which sunlight is provided.

The bimetal 250 is bent as it absorbs solar heat. Specifically, since the outer surface of the bimetal 250, that is, the black body treated surface may absorb sunlight well, the deformation amount of the bimetal 250 may be increased. As the solar light is absorbed, the bimetal 250 is bent according to the difference in thermal expansion rates of the two metals forming the bimetal 250. In this case, since the metal plate having a larger thermal expansion rate is disposed toward the fixing part 213, the bimetal 250 may be concavely curved toward the sunlight.

In the present embodiment, since the upper part of the bimetal 250 is fixed to the fixing part 213, the lower part of the bimetal 250 may be bent in the horizontal direction with respect to the upper part.

The second guide 260 may include a rotation bar 261 rotatably fitted between the pair of bimetals 250 and a head portion 262 provided at an end of the rotation bar 261. At this time, both ends of the pivoting bar 261 may be bent to extend downward, and the head portion 262 may be provided with a pair of the bent ends.

The head part 262 may have a shape corresponding to the shape of the top surface of the first guide 230 so that the second guide 260 is interlocked with the first guide 230. In detail, the head 262 is connected to the first guide 130 and rotates together with the first guide 230. For example, when the first guide 230 has a pair of wings 231, the head portion 262 may be formed in a wedge shape that fits into the valley portion 234, and the head portion 262 and The wing 231 may be adhesively fixed.

The rotation bar 261 is rotated as the bimetal 250 is bent, and the rotation center may be a contact portion of the head 262 and the first guide 230. In detail, the pivoting bar 261 may be provided in a space between the bottoms of the pair of bimetals 250.

When the bimetal 250 is bent, the bimetal 250 pushes the outer surface of the pivoting bar 261 fitted to the lower part, whereby the pivoting bar 261 is tangential to the shaft 220 (left and right directions in FIG. 6). External force is applied. Since the head portion 262 is connected to the first guide 230, this external force acts as a moment to rotate the entire first guide 230. Therefore, when the bimetal 250 is bent, the pivoting bar 261 is attracted to the bimetal 250, and the first guide 230 generally centers the contact portion between the head part 262 and the first guide 230. Is rotated.

In the present embodiment, a method in which the head portion 262 is bonded to the valley portion 234 of the first guide 230 is fixed as an example, but the coupling method of the second guide 260 and the first guide 230 is illustrated. Is not limited to this. For example, a lower portion of the second guide 260 may be fitted and fixed to a portion of the first guide 230.

FIG. 8 is a diagram illustrating a state in which the non-powered solar tracking device of FIG. 5 operates in response to a solar azimuth change. FIG. 8A is a side view of the solar tracking device, and FIG. 8B is a plan view of the solar tracking device. Referring to FIG. 8, the shape of the bimetal 250 according to the change of the position of the sun and the states of the first guide 230, the reflector 240, and the second guide 260 may be confirmed.

In the present embodiment, the sun is positioned on the left side of the solar tracking device 20 in the morning, and the example is positioned on the right side in the afternoon.

Since the bimetal 250 is not thermally expanded by sunlight before sunrise, the bimetal 250 is maintained at noon in FIG. 8.

In the morning, since the sun is located on the left side of the housing 200, any one of the bimetals 250a can absorb sunlight better, so that the entire bimetal 250 concave concave leftward toward the sun. .

The second guide 260 is connected to the lower part of the bimetal 250, and as described above, since the rotating bar 261 is provided between the lower parts of the bimetal 250, the rotating bar 261 includes the bimetal 250. The bimetal 250 moves together in the bending direction, and thus, the first guide 230 and the reflector 240 coupled to the second guide 260 rotate about the axis 220. That is, when the bimetal 250 is bent to the left side, the first guide 230, the second guide 260, and the reflector 240 rotate in the counterclockwise direction. As a result, the main reflective surface 241 of the reflector 240 may be positioned to face the sun.

At noon, the altitude of the sun becomes higher and higher, and at noon, the sun supplies the same energy to both bimetals 250a and 250b, with the same amount of thermal expansion of both bimetals 250a and 250b. The bimetal 250 may not be bent in any direction, and the reflector 240 may face upward.

In the afternoon, since the sun is located on the right side of the housing 200, any one of the bimetals 250b can absorb sunlight better, so that the entire bimetal 250 is concave in the right direction towards the sun. Bent. Accordingly, the rotation bar 261 moves together with the bimetal 250 in the direction in which the bimetal 250 is bent, and thus the first guide 230 and the reflector 240 coupled to the second guide 260. Since the axis 220 rotates in a clockwise direction, the main reflective surface 241 of the reflector 240 may be positioned to face the sun.

Hereinafter, a non-powered solar tracking device according to another embodiment of the present invention will be described with reference to FIGS. 9 to 14. However, another embodiment has a difference in that a ball chain and a belt pulley are included in the second guide as compared to the embodiment, and thus, the difference will be mainly described. In addition, in the following description, in order to avoid duplicate description, detailed descriptions of the components will be omitted, and if necessary, the preceding numerals will be replaced with 2, 3, and 4 respectively. For example, the housing of the non-powered solar tracking device 30 corresponding to the housing 100 of the non-powered solar tracking device 10 may be represented by the reference numeral 300. For example, the non-powered solar tracking device 30 includes the housing 300, the fixing means 310, the shaft 230, the first guide 330, the reflector 340, the bimetal 350, and the second guide. 360, bearing 370, and thermal insulation bushing 380.

9 is a perspective view showing a non-powered solar tracking device according to another embodiment of the present invention, Figure 10 is a side cross-sectional view cut near the ball chain of Figure 9, Figure 11 is a part of the ball chain and pulley of Figure 9 12 is an enlarged perspective view, FIG. 12 is a side view of FIG. 11, and FIG. 13 is a cross-sectional view showing the configuration of the pulley of FIG. 9.

9 to 13, the non-powered solar tracking device 30 according to another embodiment of the present invention has a cylindrical housing 300 through which light can pass, and a fixing provided inside the housing 300. It passes about the means 310 and the direction through which the bottom surface of the housing 300 passes (the x-axis direction in FIG. 9), and the axis 320 through which a nut fluid flows through, and the axis 320 about. The rotatable first guide 330, the reflecting portion 340 is connected to both sides of the first guide 330 rotatable about the shaft 320, and the bimetal 350 is fixed to the fixing means 310 And a second guide 360 for rotating the first guide 330 according to the deformation amount of the bimetal 350.

The fixing means 310 may have two or more straight portions 311a extending in the X axis in the housing 300. At this time, since the fixing portion 312 having a rectangular cross section for directly fixing the bimetal 350 may be provided in the straight portion 311a, two or more fixing portions 312 may be provided together with the straight portion 311a. Can be.

The first guide 330 may be provided to be rotatable about the axis 320, and transmits the movement of the bimetal 350 to the reflector 340 to rotate the reflector 340. In this case, the first guide 330 may be a pulley having a plurality of grooves having the same size, and may have a structure in which the plurality of grooves are constantly arranged.

In addition, the first guide 330 may be provided to be fitted to the central portion of the shaft (320). Therefore, the reflector 340 and the auxiliary reflector 390 may be provided at both sides of the first guide 330.

The pair of bimetals 350 may be spaced apart from each other by a predetermined distance about the shaft 320 and may be fixedly fixed to the fixing means 310. In this case, the bimetal 350 may be formed of two metal plates having different heat transfer rates, and may have a rectangular cross section. For example, the bimetal 350 may have a rectangular cross section extending longer in the Z-axis direction.

The pair of bimetals 350 may be fixed to the fixing means 310 by fastening means 351 such as bolts, or may be connected to each other, and at least one formed at regular intervals to allow the fastening means 351 to pass therethrough. The fastening hole 352 may be included. In the present embodiment, the bimetal 350 has two fastening holes 352 formed as an example, but is not limited thereto.

Specifically, the fastening hole 352 on the upper side of the bimetal 350 is configured to correspond to the fastening hole 314 of the fixing means 310 to be used for coupling the bimetal 350 to the fixing means 310. Can be. The fastening means 351 may include a washer, a sleeve, a bolt, and a nut, but is not limited thereto.

Here, the bimetal 350 may be disposed such that the metal plate having a higher thermal expansion coefficient faces the inside of the housing 300. As a result, when the bimetal 350 absorbs and deforms thermal energy, the lower portion of the bimetal 350 may be bent toward the direction in which sunlight is provided.

The bimetal 350 bends as it absorbs solar heat. In detail, since the outer surface of the bimetal 350, that is, the black body treated surface may absorb sunlight well, the deformation amount of the bimetal 350 may be increased. As the solar light is absorbed, the bimetal 350 is bent according to the difference in thermal expansion rates of the two metals forming the bimetal 350. At this time, the bimetal 350 has a larger thermal expansion coefficient is disposed toward the inside of the housing 300, it is bent concave toward the sunlight.

In the present embodiment, since the upper part of the bimetal 350 is fixed to the fixing part 312, the lower part of the bimetal 350 may be bent in the horizontal direction with respect to the upper part.

The second guide 360 may be directly connected to the bimetal 350 to operate the first guide 330 to be rotated according to the deformation amount of the bimetal 350. In this case, the second guide 360 may surround the first guide 330, and both sides of the second guide 360 may be connected to the bimetal 350.

The second guide 360 may be a ball chain having a structure in which a plurality of balls are extended. At this time, the ball may be formed in a size corresponding to the groove of the first guide 330, the ball of the second guide 360 may be coupled to the groove of the first guide 330. Therefore, when the bimetal 350 is bent, the second guide 360 moves along the direction in which the bimetal 350 is bent, whereby the first guide 330 overlapped with the ball due to the ball of the second guide 360. As the groove is rotated, the first guide 330 may rotate.

In the present exemplary embodiment, the first guide 330 is described as an example of the pulley, and the second guide 360 is described as an example of the ball chain, but the first guide 330 and the second guide 360 are described. It is not limited to this. For example, it may be provided as a sprocket having a tooth structure and a corresponding chain.

FIG. 14A is a side view of the solar tracking device, and FIG. 14B is a plan view of the solar tracking device. Referring to FIG. 14, the shape of the bimetal 350 according to the change of the position of the sun and the states of the first guide 330, the reflector 340, and the second guide 360 may be confirmed.

In the present embodiment, the sun is positioned on the left side of the solar tracking device 30 in the morning, and the example is positioned on the right side in the afternoon.

Since the bimetal 350 is not thermally expanded by sunlight before sunrise, the bimetal 350 is maintained at noon in FIG. 14.

Since the second guide 360 is connected to the lower portion of the bimetal 350, the second guide 360 moves together with the bimetal 350 in a direction in which the bimetal 350 is bent, thereby causing the second guide 360 to move. The first guide 330 and the reflector 340 coupled to each other are rotated about the shaft 320. That is, when the bimetal 350 is bent to the left side, the first guide 330, the second guide 360, and the reflector 340 rotate in the counterclockwise direction. As a result, the main reflective surface 341 of the reflector 340 may be positioned to face the sun.

At noon, the altitude of the sun becomes higher and higher, and at noon, the sun supplies the same energy to both bimetals 350a and 350b, and the amount of thermal expansion of both bimetals 350a and 350b is the same. The bimetal 350 may not be bent in any direction, and the reflector 340 may face upward.

In the afternoon, since the sun is located on the right side of the housing 300, the entire bimetal 350 concave concave in the right direction toward the sun. Accordingly, the second guide 360 is moved together with the bimetal 350 in the direction in which the bimetal 350 is bent, and thus, the first guide 330 and the reflecting part are engaged with and coupled to the second guide 360. Since the 340 rotates in a clockwise direction about the axis 320, the main reflective surface 341 of the reflector 340 may be positioned to face the sun.

Hereinafter, an efficiency comparison graph of a non-powered solar tracking device according to an embodiment of the present invention will be described with reference to FIG. 15.

Referring to FIG. 15, when the efficiency of the collector having a two-axis tracking device is 100, the power-supply

solar tracking device

10, 20, 30 according to the present invention may vary in efficiency with time.

For example, the radiation energy black body emission of the

bimetals

150, 250 and 350 at 08 o'clock is smaller than the direct solar radiation, and at 10 o'clock, the

bimetals

150, 250 and 350 can exhibit the same efficiency. Since the radiant energy of the black body is the same as the direct solar radiation of the sun, the same efficiency as ⓑ can be obtained, and at 12 o'clock, the radiant energy of the black metal (150, 250, 350) is a direct solar radiation of the sun. Since it becomes smaller than the energy, it can show the efficiency as ⓒ.

In addition, since the radiation energy black body emission of the

bimetals

150, 250 and 350 at 14:00 is the same as the direct radiation of the sun, the efficiency can be the same as ⓓ, and the

bimetals

150, 250 and 350 are about 15 o'clock. Since the radiant energy of the blackbody is smaller than the direct radiant energy of the sun, it can exhibit the same efficiency as ⓔ.

As such, the non-powered

photovoltaic tracking device

10, 20, 30 in the present invention may exhibit a unique curved shape according to the reaction time delay of the

bimetals

150, 250, 350.

Although the solar tracking device according to the embodiment of the present invention has been described as a specific embodiment, this is only an example, and the present invention is not limited thereto and is interpreted as having the broadest range in accordance with the basic idea disclosed herein. Should be. One skilled in the art can combine and substitute the disclosed embodiments to implement a pattern of a shape that is not indicated, but this is also within the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, it is apparent that such changes or modifications belong to the scope of the present invention.

The non-powered solar tracking device according to the embodiments of the present invention may be used in the industrial solar tracking device industry.

Claims

A cylindrical housing through which light can pass;

Fastening means provided in the housing;

An axis passing through the housing along an extension direction of the housing and provided with an energy conversion means therein;

A first guide rotatable about the axis;

A reflector connected to the first guide and rotatable with the first guide about the axis and reflecting sunlight toward the axis;

A bimetal deformably fixed to the fixing means and formed of two metal plates having different heat transfer rates; And

It includes a second guide for rotating the first guide according to the deformation amount of the bimetal,

Powerless solar tracking device.
The method of claim 1,

The bimetal is extended in the axial extension direction, the central portion is fixed, both ends are bent in the horizontal direction, the second guide wraps the bimetal, the ring portion formed so that the end of the bimetal is slidably movable, and It includes a head portion for applying an external force to the first guide in accordance with the movement of the ring portion

Powerless solar tracking device.
The method of claim 1,

The bimetal is fixed in the upper portion, the lower portion is bent in the horizontal direction, the second guide includes a rotating bar fitted between the pair of bimetal, the both sides of the rotating bar is bent to include a head portion formed below

Powerless solar tracking device.
The method according to any one of claims 1 to 3,

The first guide includes a wing portion to which the head portion of the second guide is connected and fixed

Powerless solar tracking device.
The method of claim 4, wherein

The wing portion has a concave shape toward the reflecting portion, and a rear surface of the wing portion is formed as an auxiliary reflecting surface for reflecting light reflected from the reflecting portion again.

Powerless solar tracking device.
The method of claim 1,

The bimetal has a top fixed, a bottom bent in a horizontal direction, spaced apart and provided a pair,

The second guide is connected to the bimetal and moves in accordance with the movement of the bimetal,

The first guide rotates according to the movement of the second guide

Powerless solar tracking device.
The method of claim 6,

The first guide is a pulley having a constant groove, the second guide is formed of a ball chain having a ball of a size corresponding to the groove of the pulley

Powerless solar tracking device.
The method of claim 1,

The bimetal is provided in pairs,

Of the two metal plates constituting the bimetal, the inner metal plate of the bimetal close to the axis has a higher coefficient of thermal expansion than the outer metal plate of the bimetal away from the axis.

Powerless solar tracking device.
The method of claim 8,

The bimetal has a black body surface outside the shaft and an inner surface close to the axis is a total reflection surface.

Powerless solar tracking device.
The method of claim 1,

The second guide is a cam that converts the linear movement of the bimetal into a rotational movement and transmits it to the first guide.

Powerless solar tracking device.
The method of claim 1,

The reflector further includes a main reflecting surface that reflects sunlight and a support to fix the curvature and shape of the main reflecting surface.

Powerless solar tracking device.
The method of claim 1,

The housing is a vacuum tube

Powerless solar tracking device.
The method of claim 1,

It includes a bearing provided in the form surrounding the shaft

Powerless solar tracking device.
The method of claim 13,

Further comprising a thermal insulation bushing between the shaft and the bearing for blocking thermal interference of the shaft

Powerless solar tracking device.
The method of claim 1,

The weight is mounted on the first guide

Powerless solar tracking device.
The method of claim 1,

The energy conversion means is a heat medium fluid flowing inside the shaft.

Powerless solar tracking device.
The method of claim 1,

The energy conversion means is a thermoelectric element provided inside the shaft

Powerless solar tracking device.