Method to manufacture reflecting device of solar station

FIELD: power engineering.

SUBSTANCE: in the method to manufacture a reflecting device of a solar station including web rolling, its installation into the body of the reflecting device and its further tensioning with a force determined in accordance with the empirical formula: T I = ( δ h 1,33 ) в Е 10 3 , where: T1 - web tensioning load, te, δh - transverse variation in thickness of the web, mm (h - web thickness), "в" - web width, mm, E - elastic modulus in kgf/mm2 for web material used in the reflecting element.

EFFECT: reduced mass and cost of a reflecting device due to reduction of mass and cost of a reflecting element through usage of a metal tape with smaller thickness as the base.

4 dwg

 

The invention relates to the field of solar power and can be used on plants in the manufacture and installation of reflective elements.

Known reflective device for solar systems, in which the reflective element used transparent glass sheets, one side of which is covered with silver amalgam, set in massive buildings. (See "High-temperature solar furnace". Edited by V.A. Bauman. Moscow. Publishing house of foreign literature. 1990. P.12).

By virtue of the known reflective device is a high flatness of the glass bases reflective element.

The disadvantages of the known device is that the basis of the reflective element is glass. Therefore, in order to avoid destruction of the element under the action of its own weight, its a glass substrate has to do with increased thickness and weight.

Known reflective device for solar systems, in which the reflective element of the mirror used sheet metal, mounted in a robust housing. (See ibid, p.15).

By virtue of the known device is that the basis of the reflective element made in the form of sheet metal, is not susceptible to brittle fracture; in addition, it is possible to shape cylindric the ski paraboloid due to the plastic bending.

The disadvantage of this device is that the metal base of the reflective element has an increased thickness (5...7 mm) to give it the necessary flatness.

The technical result of the invention is to reduce the weight and cost reflective devices, by reducing the mass and cost of the reflective element by using as the base metal strip having a reduced thickness.

The technical result is achieved in that in the method of manufacturing a reflective devices, solar systems, including rolling canvases and install it in the case of the reflective device installed in the building fabric reflective element stretch with a force determined by the empirical formula:

TI=(δh1,33)inE10-3

where: TI- force stretching canvases, TC;

δh is the transverse thickness of blade, mm (h - height of fabric);

in - width, mm;

E - the modulus of elasticity of the first kind in kgf/mm2for the material of the cloth used in the reflective element.

The invention is illustrated by the graphic material is AMI, where:

- figure 1 is a diagram of the solar systems,

- figure 2 shows a reflective device, a top view,

- 3 - section a-a in figure 2;

- figure 4 shows a schematic cross section of a cloth reflective element.

In the center of the solar systems (figure 1) placed the heated object 1. Around him on the path 2 set of reflective elements 3, 4, 5, 6, 7, 8 and 9. The direction of the sun at any given point in time shown by arrows 10.

In each of the reflective device of the reflective elements 3-9 set at such an angle to the horizontal, so that the angles αiand βiare mutually equal (i.e. α11; α22etc).

Reflective device (2) includes a housing 11 and left and right tensioning mechanisms, each of which includes (3) lower lip 12 with the shank 13, which is screwed the tension nut 14 with resistant thread and the top of the sponge 15 is connected with the lower sponge 12 securing screws 16.

Between the jaws 12 and 15 of the left and right tensioning mechanisms are placed the ends of the fabric reflective element 17, clamped with clamp screws 16. Thanks tension nuts 14 canvas reflective element 17 is in a pre-tensioned state.

Between the nut 14 and the housing 11 is installed thrust bearing 18 for raising the efficiency of screw pair.

Ways is as follows.

Canvas reflective element 17 made in the form of a mirrored sheet metal, a measure of the roughness of the mirror surface is Ra=0,08µ)with width=1200 mm, working length l=2000 mm (figure 2), the thickness h=0.6 mm (figure 4) and the transverse thickness variation δh=0,002 mm=2µ.

The material of the reflective element 17 - alumomagnesium alloy AMG-2; the modulus of elasticity of the first kind for this alloy E=7000 kN/mm; mass body 11 is equal to GI=2000 kg

Cross-sectional and cross struts casing: 2B1×H1=150×250 mm2; B2×H2=250×150 mm2(the latter is in the form of girder) (figure 2 and 3). Between the housing 11 and the nut 14 has a bearing 18.

Rolling canvas reflective element (mirrored sheet metal) carried out at the mill "quarto", fitted mirror rolling rolls with the length of the work roll barrel L=1350 mm, its diameter D=400 mm and a diameter of support roll (D0=800 mm, and an indication of the roughness of the mirror surface of the barrel Ra=0,04µ.

Load - R=360 TC; as a result, precision rolling get the relative transverse thickness ε=δh/h=0,002/0,6=0,0033 or 0.33% under normal rolling is ε=0,5...1%. Approximately the same value is different and the difference between the hoods on the middle and along the edges of the sheet (on the edges it more)that take place when the use of the ke.

Thus, ε=0,0033 and is a measure of the flatness of the mirror sheet, which he has after rolling.

To achieve the required flatness of the mirror sheet, when used in a reflective device, you want the middle of the sheet to pull additional 0.33% and to equalize it, thus, with the hood on edges. For this purpose, the sheet must be applied tensile stress:

TI=(δh1,33)inE10-3

where: TI- the tensile stress in the cu;

δh=0,002 mm - transverse thickness of the sheet (sheet), mm;

E=7000 kN/mm2- the modulus of elasticity of the first kind for the material of the reflective element;

h=0.6 mm, the thickness of the mirror plate (sheet), mm

in=1200 mm - width mirror sheet (cloth), mm.

Then the necessary tensile stress

TI=(0,0021,33)1200700010-3=12,5twith a

This rustagi the abuser effort and develop tension nuts 14 threaded type Up×3, tightening them with a force equal to Q=50 kgf on the shoulder of the application of this effort, the components of one meter.

Given the effort TIcan be achieved if stretch fabric reflective element by the value of Δλ=5 mm And the elastic deformation of the reflective device, this value should be increased by 10%, then the nut 14 screw under load on the shank 13 the total value of Δλc=5,5 mm

To achieve tensile forces TI=12,5 TC force clamping the ends of the element 17 between the jaws 12 and 15 must be twice as big and reach N=2TI=2·12,5=25 TC.

This total effort and develop the ten clamping screws 16 (on each side) with thread M20.

In order to ensure uniformity of mirror reflection across the surface of the reflective element, it is produced in the casting and rolling machine for rolling aluminium and its alloys, i.e. from liquid metal to the finished mirror sheet in the same unit; this allows you to exclude in-process transport operations, thereby avoiding possible injury to the mirror surface of the element. In addition, the proposed solution allows to reduce the thickness of the reflective element with 5...7 mm to 0.6 mm, i.e 8-11 times, 7...10 times to reduce the weight of the reflective element solar power plants and about the same time SNES shall be its value.

A method of manufacturing a reflective devices, solar systems, including rolling canvases reflective element and inserting it in the case of the reflective device, wherein the set of body painting reflective element stretch with a force which is determined by the empirical formula:
TI=(δh1,33)inE10-3,
where TI- force stretching canvases, TC;
δh is the transverse thickness of blade, mm (h - height of fabric);
in - width, mm;
E - the modulus of elasticity of the first kind in kgf/mm2for the material used in the reflective element.



 

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