Solar semi-shading heat-driven automatic tracking device

Abstract

A solar semi-shielding type thermal drive automatic tracking device aims at improving tracking accuracy and reducing tracking cost. A heat collection pipe (1) is arranged at the focal line position of a paraboloidal concentration groove (2). An opening (19) is formed in the center of the paraboloidal concentration groove (2). A paraboloidal concentration groove (12) is arranged on the opening (19). A heat collection pipe (14) is arranged at the focal line position of the paraboloidal concentration groove (12). Sunlight which is emitted towards the heat collection pipe (14) from the positions behind and on the rear side of the paraboloidal concentration groove (12) is totally shielded by the first heat collection pipe (1) and the paraboloidal concentration groove (12). Sunlight emitted towards to the heat collection pipe (14) from the positions in front of and on the front side of the paraboloidal concentration groove (12) is focused on the heat collection pipe (14). Sunlight emitted towards the heat collection pipe (14) from the heat collection pipe (1) is partly shielded. An expansion pipe (13) is arranged inside the heat collection pipe (14). An inner cavity of the expansion pipe (13) is communicated with an inner cavity of a hydraulic cylinder (9) through a pressure guide pipe (8).

Description

technical field [0001] The invention belongs to the technical field of solar tracking, and in particular relates to a technology and a device for tracking the position of the sun by using sunlight to heat an expansion fluid in a heat collecting tube. Background technique [0002] The direct sun incident light at a certain point on the earth is changing at any time. In order to utilize the direct sun radiation energy as much as possible, the solar energy utilization device is required to be equipped with a device that can track the position of the sun. Most solar tracking devices are mainly electric drive devices. This type of device has high tracking accuracy, but energy consumption and high cost in the tracking process. A device that can track the position of the sun through the energy of sunlight, that is, a device that tracks the sun through the sun, has no energy consumption, low cost, and easy maintenance, and has high application prospects and market value. [0003] S...

AI Technical Summary

Problems solved by technology

Furthermore, in the early morning or later in the afternoon, the solar radiation becomes weaker, and to ensure a larger temperature difference must require a larger light-receiving area difference, so the gap between the device and the sun's incident light The angle must be further increased, and the tracking error is correspondingly larger

In short, the tracking error of this technology is small at noon, and the tracking error of this technology gradually increases with the increase of the sun's azimuth angle and the weakening of the solar radiation intensity

[0006]3. The device will automatically reset when the cloud is shading the gap, and then track after the sun comes out, but because there is no concentrating device, there is a slow rotation tracking process, which requires a long adjustment time

[0007]4. The rack and pinion transmission is a linear displacement angle conversion device, that is, when the rotation angle of the gear is the same, the displacement distance of the rack is required to remain unchanged, that is, the thermal expansion is required The volume expansion of the fluid remains constant, and in the morning and evening, the amount of solar radiation is small, and the temperature of the thermally expanding fluid rises slowly, so its tracking speed is slower than at noon, and it is difficult to keep the rotation speed of the device constant throughout the day , and it is difficult to keep consistent with the angular velocity of the sun, so its tracking error is relatively large

[0008]5. This technology is easy to shake under strong wind conditions, which may easily cause damage to the device

The double-endothermic cavity differential pressure piston drive device requires filling gaseous substances, or semi-gaseous and semi-liquid substances inside. If the double cavity is completely filled with liquid substances, due to the incompressibility of liquid, the liquid heat-absorbing cavity on the high temperature side will also It is impossible to squeeze the heat-absorbing chamber on the low-temperature side to cause piston displacement. In addition, when the temperature in the double heat-absorbing chambers is high, the volume expansion of the liquid has no place to release, which will cause the heat-absorbing chamber to burst

This kind of device containing gaseous substances inside is easy to shake with the size of the wind under strong wind conditions, resulting in large tracking errors and easy damage to the device

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