RO130930A2 - Mixed heliothermal actuator with parabolic concentrator - Google Patents

Abstract

The invention relates to a solar actuator designed based on the principle of solar-thermal-mechanical conversion. The claimed actuator comprises a bimetallic spiral (1), shaped according to the path of a plane spiral spring, said spiral being placed in a paraffin thermally conductive medium (2) contained in a flat cylindrical tightly closed container (3) placed, by means of tubular supporting leg (4), within the focus point of a parabolic concentrator (5), fixed in a support (6) adjustable on a supporting surface (7), the thermal dilation of paraffin thermally conductive medium (2), generated by a solar thermal effect, being compensated by means of some Bourdon tubes (10 and 10') connected, by means of some collecting channels (11 and 11'), the outward deformation of the Bourdon tubes (10 and 10') caused by the pressure generated by the molten paraffin being converted into force and linear displacement by means of roll and spring rods (12 and 12').

Description

Deposit Date

Mixed heliothermal actuator with parabolic concentrator

The invention relates to a solar actuator designed on the principle of helio-thermo-mechanical conversion consisting mainly of a thermomechanical converter with thermobimetal lamella associated with a thermomechanical converter with paraffin, both placed in the focus of a parabolic type solar concentrator.

in order to achieve an actuator based on the principle of helio-thermo-mechanical conversion, a solution is known (CERNOMAZU, D .; MANDICI, L .; SOREA, N. et. al. Solar actuator. Patent application no. A / 01101 / 2011, OSIM Bucharest) consisting mainly of a thermobimetallic strip modeled after the path of a spiral arc with several turns, in a paraffinic thermoconductive environment and closed in a flat cylindrical container positioned in the focus of a parabolic concentrator.

The disadvantage of the described solution is that it does not capitalize on the ability of paraffin to generate force and displacement, by increasing the volume, when changing the state of solid-liquid aggregation.

The technical problem solved by the invention consists in the use of paraffin initially used only as a thermally conductive medium and to generate force and displacement when changing the state of solid-liquid aggregation.

The mixed heliothermal actuator with parabolic concentrator according to the invention removes the aforementioned disadvantage, in that the flat bimetallic spiral and the paraffin container in which it is embedded are connected to an outer assembly, consisting of two coaxial and coplanar Boudon tubes, through collecting channels; said Bourdon tubes are intended to compensate for variations in the volume of the paraffinic thermal medium and to generate force and displacement by means of roller and spring rods connected to the actuated elements.

The invention has the following advantages:

increasing the number of actuated elements;

small size;

constructive simplicity.

An embodiment of the invention is given below in connection with FIG. 1 and fig. 2 which represents as follows:

Fig. l a longitudinal section through the actuator;

Fig.2 - a cross section through the actuator.

_a 20U-- 0 0 6 2 0 t 3 am

The mixed heliothermal actuator with parabolic concentrator according to the invention (fig. 1 and fig.

2) consists mainly of a bimetallic strip 1, modeled after a spiral arc path with several turns, embedded in a paraffin-based thermal conductive medium 2 contained in a flat cylindrical container 3, sealed and placed by means of a tubular support piece 4 in the focus of a parabolic concentrator 5 fixed in turn by an adjustable support with "nut-type" joint 6 of a support surface 7. The bimetallic spiral 1 is anchored with the outer end to the inner wall of the container 3, and with the inner end of a hub shaft which rests on gasket-sealed sliding bearings and whose shaft end is connected, by a mechanical coupling 8, to a flexible shaft by which the associated mechanism is actuated, and which are positioned inside the tubular support

4.

To compensate for variations in the volume of the medium 2, when switching from the solid to the liquid phase, under the action of heat of solar origin, an assembly is used consisting of two Bourdon tubes 10 and 10 'positioned coaxially and coplanarly and which by means of channels collectors 11 and 11 'are fixed to the cylindrical surface of the container 3 and are connected, at the same time, to the internal thermal conductive environment 2.

The molten paraffin discharged to the two Bourdon tubes 10 and 10 'determines, by the created pressure, their deformation towards the outside. In the manner described, said deformation is converted by means of roller and spring rods 12 and 12 ', respectively, in linear motion, transmitted to said two other mechanisms.

The mixed heliothermal actuator with parabolic concentrator can be reproduced with the same performance and characteristics whenever necessary, which is, of course, an argument in favor of compliance with the criterion of industrial applicability.

Claims (2)

claims 1. Mixed heliothermal actuator with parabolic concentrator made on the principle of helio-thermo-mechanical conversion, characterized in that it consists mainly of an internal thermomechanical converter made of a thermobimetallic lamella (1) modeled after the path of a spiral spring with several coils, placed in a paraffinic thermoconductive medium (2), contained in a flat cylindrical container (3), tightly closed and placed by means of a tubular support (4), in the focus of a parabolic concentrator and where the thermal expansion of the paraffinic thermoconductive medium (2), generated by the heliothermal effect, is compensated by means of Bourdon tubes (10) and (10 ') connected by some collecting channels (11) and (11') to the paraffin-filled container (2). Heliothermal actuator according to claim 1, characterized in that the thermomechanical converter (2) is fixed at the upper end to the wall of the container (3) and at the inner end by a shaft with a hub whose rotational movement results from the deformation of the bimetallic blade ( 1) it is transmitted by means of a mechanical coupling and a flexible shaft to one of the actuated mechanisms; the two Bourdon tubes (10) and (10 ') are in fact two other thermomechanical converters deform outwards, as a result of the expansion of the paraffin by the same heliothermal effect generating force and linear displacement by means of roller and spring rods (12) respectively ( 12 ').