Large lightweight mirror composite construction (options)

 

(57) Abstract:

Usage: optical instrumentation and solar technology, in particular optical mirrors are of composite construction, which is characterized by high rigidity, heat resistance and heat stability, in the manufacture of solar concentrators. The invention is: to improve the manufacturability and regulation forms at high concentrations of the focal spot of a concentrating mirror composite construction in large lightweight composite mirror structure containing the basis bonded together hollow polyhedrons placed on the top of the footing elements with flat optical surface, the mirror is made in the form of a hub, polyhedra made in the form of a right truncated hexagonal pyramids, with their side faces are oriented to the plane of the corresponding upper base of the truncated pyramid at an angle selected from the ratios given in the description. 2 S. p. f-crystals, 2 Il.

The invention relates to an optical instrument engineering and solar technology, namely to the optical mirrors are of composite construction, characterized by the centralizers of solar radiation.

Currently, the problem of obtaining clean, affordable and cheap sources of energy rose sharply enough. A special place among these energy sources on the inexhaustible and availability is solar energy. Large mirrors are of composite construction, currently used for concentration of solar radiation are either insufficiently rigid, heat-resistant and thermostable, or the convergence and mutual fastening of the basis elements with the optical surface during the formation of the hub cause is often difficult to overcome obstacles.

Known as the hub of the solar radiation, containing the supporting frame and mounted thereon by means of alignment of nodes spaced straight rows of bezel having a cylindrical surface and a combined minimum cross section of the reflected their flows of solar radiation [1]

However, framing the famous hub of solar radiation has insufficient rigidity, heat resistance and heat stability, resulting in effects on the hub, for example, extreme temperatures, wind, etc. is defocusing facet of the hub is ICIE adjusting device does not allow again to quickly focus a significant number of facet especially with the rapid changes affecting factors leading to rasfokusirovka facet.

The closest in technical essence (prototype) is a large mirror composite structures containing in the base is bonded between a hollow polyhedral prism made in the form of an inverted cups, the tops of the reasons which made depressions in the form of sectors of cylinders with a common radius and centers at the points of overlapping peaks and recesses made one hole in each of which includes a pin of the mating disc, made in the form of a cylinder with a radius and height, sootvetsvenno equal to the radius and height of the cylindrical recesses in the tops of the bases of the prisms, and on these grounds and made them flush with the base and made them flush base interfacing disks that form a common continuous plane, the applied layer, the outer surface of which is optically processed, and fixing all of the elements together made through solder [2]

However, the known large lightweight composite mirror structure does not allow to receive the hub of the solar radiation due to the inability of attachment and mutual mounting bases sostaga layer makes it impossible to create a concentrating mirror of the individual optical elements.

The purpose of the invention improve the manufacturability and regulation forms at high concentrations of the focal spot of a concentrating mirror composite construction.

The objective is achieved by the fact that in large lightweight composite mirror structure containing the basis bonded together hollow polyhedrons placed on the top of the footing elements with flat optical surface, the mirror is made in the form of a hub, polyhedra made in the form of a right truncated hexagonal pyramids, with their side faces are oriented to the plane of the corresponding upper base of the truncated pyramid at an angle selected from the following equation:

cos where d is the diameter of a circle inscribed in an element with an optical surface;

- minimum clearance between adjacent elements at the location of their optical axis normal to the corresponding upper base of the truncated pyramid;

L the shortest distance from the location information reflected from the optical elements of radiation beams to the respective upper bases of the truncated pyramids at the location of the optical axis of the elements normal to the upper base of the curved shape of the optical surface, when this angle is chosen from the following relationship:

cos where Raboutthe radius of curvature of the optical surface of the element;

h the minimum distance between the optical surface of the element and the upper base of the corresponding truncated pyramid.

In Fig. 1 is a schematic diagram of large lightweight mirrors are of composite construction; Fig. 2 is the same, with a curved optical elements.

Large lightweight mirror in the form of a hub 1 a composite structure includes a base fastened by a hollow right truncated hexagonal pyramid 2 placed on the upper grounds 3 elements 4 flat optical surface 5, mounted for adjustment device 6, while the side faces 7 of the pyramids 2 is oriented to the plane of the upper base 3 corresponding truncated pyramid 2 at an angle selected from the following equation:

cos where d is the diameter of a circle inscribed in item 4 with the optical surface 5;

- minimum clearance between adjacent elements 4 at the location of their optical axis normal to the corresponding upper base of the truncated pyramid;

L shortest Russ is Sevani 3 truncated pyramids 2 at the location of the optical axis of the elements normal to the upper base.

In Fig. 2 presents a schematic diagram similar large lightweight mirrors are of composite construction with elements 4 with the curved shape of the optical surface 9, the angle selected from the following equation:

cos where Rothe radius of curvature of the optical surface 9 item 4;

h the minimum distance between the optical surface 9 of the element 4 and the corresponding upper base 3 of a truncated pyramid 2.

As element 4 is used, for example, an element with a reflecting surface (reflectance in the visible region of the spectrum 82-84%), made of aluminium alloy AMG-6 and optically processed by standard techniques, for example, by the method of diamond turning.

As the correct hollow truncated pyramids 2 is used, for example, plastic injection moulds from aluminium alloy AL-24, cast by the standard technology in the forms for the formation of the side faces 7, oriented at an angle to the upper base 3 pyramids 2 and pastoralist pyramids.

Numerical calculation of the hub is shown below.

The hub with a flat reflective elements: d=360 mm, =10 mm, L= 3000 mm, angle =91about30'.

Con="ptx2">

Mount pyramids 2 between them is carried out, for example, by bolts or rivets. Installation and adjustment of the elements 4 is realized by using, for example, widely used in solar technology mechanisms guidance.

Large lightweight mirror composite construction operates as follows.

Solar radiation strikes the surface of the mirror, representing the hub 1 through the construction of its Foundation from the correct truncated hexagonal hollow pyramids 2 with the side edges 7, oriented in the plane of the upper base 3 corresponding truncated pyramid at an angle . Solar radiation is reflected from the flat optical surface 5 elements 4, pre-adjusted using the adjusting device 6, and sent them to the place of 8 information of the reflected beam solar radiation in the so-called focus F of the multi-element mirror, which focuses the energy of solar radiation and which is located at a distance L from the upper base 3 corresponding truncated pyramids 2 with an angle of inclination of the side faces 7 of the pyramids 2 to the plane of the upper base 3 corresponding truncated pyramid 2.

The technical result of the invention are: to improve the manufacturability of a concentrating mirror not less than 20% by ensuring the coupling of the bases in the proper application of hollow truncated hexagonal pyramids with the side edges oriented to the plane of the upper base of the corresponding pyramid at a given angle, depending on the focus of the hub; providing the possibility of various forms of the hub due to the alignment of the optical elements and the surface of the curved shape on the latter; to provide a high concentration of the focal spot due to the alignment of optical elements and a curved surface on the latter.

1. Large lightweight composite mirror structure containing the basis bonded together hollow polyhedrons placed on their bases flat reflecting optical element is e, the base of which is connected with the flat reflecting optical elements, this side faces of the pyramids are oriented to the plane of the smaller base at an angle selected from the conditions of the contacting side faces of the pyramids, the smaller base of which is placed tangent to the sector of a sphere with radius equal to twice the distance from the designated information reflected from the optical elements of radiation beams to the respective upper bases of the truncated hexagonal pyramid, and the reflecting optical elements mounted for alignment.

2. Large lightweight composite mirror structure containing the basis bonded together hollow polyhedrons placed on their bases reflecting optical elements, wherein the reflecting optical elements are made curved polyhedra in the form of a right truncated hexagonal pyramid, the smaller base of which is connected with the optical reflecting elements, while the side faces of the pyramids are oriented to the plane of the smaller base at an angle which is chosen from the condition of the contacting side faces of the pyramids, the smaller base of which is placed tangent to the sector of a sphere with radius equal to the distance from the center of curvature optical is

 

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