JPS5930243B2 - heliostat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A GL type heliostat is known as a heliostat that follows the movement of the sun and always reflects sunlight in a fixed direction.

This principle is shown in Figure 1, where 1 is an axis parallel to the earth's axis and tilted by the latitude ψ of the point on the north-south line.
A rod 5 is pivotally supported at the tip B of a rotary arm 2 centered on a fixed point A on the shaft 1. The reflecting mirror 7 is rotatably supported by a support 12, and the reflecting mirror 7 is attached perpendicularly to the rod 5 at this support point M. , 9 are heat collectors installed at the top of the tower 8. Point M is positioned so that the direction of AM points toward the heat collector 9 and AM=AB.

The sun apparently rotates around the earth's axis at a speed of 15 degrees per hour, so at a certain time, arm 2 is set to face the direction of the sun's rays 10, and the relationship between axis 1 and arm 2 is If the axis 1 and the arm 2 are rotated together around the axis 1 at the same angular velocity as the sun without changing the angle δ (this is called rotation tracking), the arm 2 will always face the direction of the sun's rays 10. (This is called rotation tracking.) In triangle ABM, the length of arm 2 is equal to the length of AM, so this triangle AB
M is an isosceles triangle and always LABM=LAMB.

By the way, the sunlight ray 10 incident on point M is reflected by the reflecting mirror 7, but since the angle between the sunlight ray 10 and the normal line of the reflecting mirror 7 is equal to LABM, and therefore LAMB, the reflected ray 11 The angle LAMB between and the connection of the reflector
are equal, and the direction of the reflected light ray 11 is always the same as the direction of AM, that is, it points in the direction of the heat collector 9. Here, the angle δ formed between the shaft 1 and the arm 2 can be fixed for a day, but there is no problem in practical use.However, since the altitude of the sun changes slightly every day, it is necessary to adjust the angle δ for a day or several days to match this. This time, correct the angle δ. (This is called revolution tracking.) The specific structure of this GL type heliostat is shown in Fig. 2.
This is done by rotating the shaft 1 through the gear 21 and the reduction gear 20 at the same angular velocity as the sun.

Reference numeral 13 denotes a casing that is integrated with the rotating arm 2, and the revolution motor 14 and the worm 16 are fixed to the casing 13.

The worm wheel 15 is centered at a point A and is fixed to a bracket 17 that is integral with the shaft 1. When the worm 16 is rotated by the revolution motor 14, the wheel 1
5 is fixed, the worm 16 rotates around point A, and therefore the casing 13, arm 2, and bearing 18 at the tip of the arm also rotate around point A.

The bearing 18 is capable of absorbing three-dimensional movement and has a structure that allows the rod 5 to slide.

The bearing 19 is capable of absorbing three-dimensional movement. Note that 7 indicates a reflecting mirror, 5 indicates a rod, and 12 indicates a support.
Therefore, in the above-mentioned heliostat, the position of point M is installed so that the direction of AM faces the heat collector 9.
Depending on the positional relationship between the heliostat and the heat collector 9, the rod 5 may collide with the casing 13.

In view of the above, the present invention eliminates the members that become obstacles around the point A, so that the rod can move without any obstruction no matter where the heliostat is installed.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4.

Since the mechanism for rotationally driving the shaft 1 is the same as the conventional one, this mechanism is not shown. Axis 1 is the axis parallel to the earth's axis, 1
7 is a boss fixed to the shaft 1.

13 is a bracket integrated with the boss 17, on which the revolution motor 14, reduction gear 28, and guide plate 2 are mounted.
7 is installed.

24 is an arcuate gear, 25 is a guide roll, and 26 is a bearing.

When the motor 14 is rotated, the shaft 29 is rotated via the reducer 28, and the gear 23 attached to the shaft 29 is rotated. Note that the shaft 29 is supported by a bearing 26 attached to the guide plate 27. The arcuate gear 24 meshes with the gear 23 and is supported by a guide roll 25. The bow gear 24 has an arc shape, and its center is at point A. Further, the guide roll 25 is attached to a guide plate 27, and the arcuate gear 24
is placed in such a position that it can rotate around point A. A bearing 18 is attached to the tip of the arcuate gear 24.

19 is also a bearing, 12 is a support that supports it, 7 is a mirror, 5 is a rod attached perpendicular to mirror 7, and rod 5
is supported by bearings 18 and 19.

When tracking rotation, the motor 14 is stopped.

In this state, axis 1 rotates at the same speed of 15 degrees/h as the sun, and point B rotates around the earth's axis at 15 degrees/h, so according to the principle described above, the point B is reflected by mirror 7. Sun's rays are always accelerated in a fixed direction. In the case of revolution tracking, when the motor 14 is driven, the shaft 29 rotates via the reducer 28, and the gear 23 attached to the shaft 29 rotates.

Then, the arcuate gear 24 meshed with this is guided by the guide roll 25 and rotates around point A. It was tough,
By rotating around points B and A, you can track seasonal changes in solar altitude. Note that point M in FIG. 3 is fixed to the rod 5, but point B is slidable along the axial direction of the rod 5.

In the conventional one shown in Fig. 2, there is a worm wheel at the circle point A, and there is a casing on the outside of the worm wheel, so this can only be used when the point M is at a position where the rod 5 will not collide with it. I couldn't.

That is, in plants where the heat collector is located in the center of the circular field, it is not possible to use it on the north side of the field.

However, although the function of the heliostat of the present invention is exactly the same as that of the conventional one, since there is nothing around point A, it has the advantage that it can be used as a heliostat for the entire field.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram for explaining the principle of the G-L heliostat, Fig. 2 is a side view showing a conventional G-L heliostat with one part cut away and one part omitted; 3
The figure is a side view showing one embodiment of the main part of the present invention, and FIG.
It is a sectional view taken along the - line in the figure. Rotating axis...1, Bow gear...24, Reflector...7, Rod...5, Drive mechanism...14,23 .

Claims (1)

[Claims] 1. A rotating shaft 1 that is installed parallel to the earth's rotation axis and rotates at the same angular velocity as the sun, and a rotating shaft 1 that is supported at one end of this rotating shaft 1 so as to rotate around a point A on an extension of this rotating shaft 1. an arcuate gear 24, a drive mechanism 14, 23 for rotating the arcuate gear 24, and a reflecting mirror tiltably supported around a fixed point M on a straight line connecting the point A and the condenser 9. 7, and the bow gear 2 is fixed to the reflector 7 perpendicularly thereto.
A rod 5 is slidably pivoted at a point B at one end of 4.
A heliostat characterized by being visible.