WO2012122909A1

WO2012122909A1 - Light concentrating solar apparatus

Info

Publication number: WO2012122909A1
Application number: PCT/CN2012/071995
Authority: WO
Inventors: 刘阳
Original assignee: Liu Yang
Priority date: 2011-03-15
Filing date: 2012-03-06
Publication date: 2012-09-20
Also published as: CN102683461A; CN102683461B

Abstract

A light concentrating solar apparatus comprises a reflector structure (2), a receiving device (5) and a cover glass (6), wherein the reflector structure (2) comprises a primary reflector (3) for receiving solar light and a secondary reflector (4) for receiving the solar light reflected by the primary reflector (3); the secondary reflector (4) is disposed in the space of the primary reflector (3); the receiving device (5) is located at the bottom of the primary reflector (3) and in the path of the reflected light from the secondary reflector (4), for receiving the solar light reflected by the secondary reflector (4); and the reflector structure (2), the receiving device (5) and the cover glass (6) form a closed light concentrating unit. Such a construction has reliable performance, high strength, low cost, and long lifetime, and can be mounted in array, for use in large scale applications.

Description

Concentrating solar device

Technical field

The invention relates to a concentrating solar device. Background technique

As a clean and environmentally friendly energy source, solar energy has long been committed to its development and utilization. In particular, in recent years, due to rising oil prices and increasing environmental protection requirements, as well as restrictions on atmospheric carbon dioxide emissions, countries have made more efforts to conduct research on solar energy utilization, which is a key component in solar energy applications. It is a higher requirement for the efficiency and manufacturing cost of solar energy reception. Concentration has the advantage of low cost, but optical tracking costs are high. In the optical concentrating system, there are mainly two kinds of transmission concentrating and reflection concentrating; wherein the transmission mirror is mostly made of organic materials; the reflection condensing mirror is formed by bending or injection molding of glass; the external surface is exposed to the atmosphere and sand. , seriously affecting reliability and service life.

At present, the commercial solar energy gathering device is mainly a reflective concentrating mirror structure, and the light-heating gathering device is a linear focusing trough structure, the parabolic trough opening is large, the wind resistance is poor, and the support structure is highly demanded, the surface The cleanliness is difficult to guarantee, and it is difficult to clean, and the heat collecting tube arranged at the focal line position is arranged on the upper part of the mirror surface, which has a shading effect on the mirror, is not easy to be made too large, and cannot take insulation measures due to large receiving area, and heat dissipation. The amount of loss is large. The solar energy gathering device for photovoltaics is reported as a butterfly gathering device, and the cleanliness of the butterfly concentrating mirror is also difficult to ensure. After a long working time, the efficiency is significantly reduced, the wind and sand resistance are low, and the support structure strength requirement is required. High, and common in single control and single installation, promotion is inconvenient; Moreover, the photoelectric conversion efficiency of solar photovoltaic cells is

10%~40%, during the operation, most of the unused solar radiation is converted into heat by the photovoltaic cell, causing the battery temperature to rise, resulting in lower power generation efficiency (according to the statistics of the battery component temperature, the output power is reduced every 1K) 0.2%~0.5%), and the long-term operation of photovoltaic cells at high temperatures will quickly age and shorten the service life, so the heat in the photovoltaic cells needs to be discharged in time. At present, the common cooling methods for photovoltaic cells include: air cooling mode and water cooling mode. A typical water cooling system consists of a heat exchanger, a water tank, and several connecting valves. Although the heat transfer efficiency is high, there are structural complexes. Miscellaneous, high cost and prone to problems such as leakage and insulation of working fluids.

Therefore, how to obtain a solar device with stable structure, safe operation and low cost, and excellent concentrating effect has become a key technical problem in the field of solar energy utilization. Summary of the invention

The object of the present invention is to solve the problem of structural stability, practicability and reliability of a solar concentrating device, and heat dissipation of a photovoltaic cell.

In order to solve the above problems, the present invention provides a concentrating solar device comprising a mirror structure, a receiving device and a cover glass. The mirror structure includes a primary mirror for receiving sunlight, and a secondary mirror for receiving sunlight reflected by the primary mirror. The secondary mirror is disposed in the space of the primary mirror. The receiving device is disposed at the bottom of the primary mirror and is located at a position of the secondary mirror reflecting the light path to receive the solar light reflected by the secondary mirror. The mirror structure, the receiving device and the cover glass constitute a closed concentrating unit.

In a further embodiment, the overall mechanical structure of the sealed concentrating unit has a certain compressive performance to resist changes in internal air pressure caused by changes in external temperature, and the sealed concentrating unit is filled with a protective gas.

In a further embodiment, a gas pressure balance device is disposed in the sealed concentrating unit. In a further embodiment, the cover glass is supported by a support structure disposed at the bottom and/or side of the curved mirror of the primary mirror.

In a further embodiment, a plurality of the closed concentrating units are regularly arranged in an array, and are fixed and supported by a cover glass, a supporting structure, and a rigid supporting member at the back of the closed concentrating unit to form a stereo composite structure of the concentrating unit combination. , greatly increase the overall strength, which is conducive to low-cost layout and installation.

In a further embodiment, the rigid supporting member of the back is a plate-like structure; preferably, the tempered glass plate is formed in parallel with the cover glass to form a double plate, and the air flow guiding channel is formed while increasing the overall strength, and the air is increased. Flow speed for enhanced heat dissipation.

In a further embodiment, the primary mirror is stamped from a sheet of metal.

In a further embodiment, a plurality of said primary mirrors are on the same large metal sheet The stamping is obtained, and the integrated plurality of primary mirror arrays and the cover glass form a concentrating unit combination.

In a further embodiment, the concentrating solar device can be applied to the field of solar photovoltaic, the receiving device is a photovoltaic cell device; the photovoltaic device includes a monolithic photovoltaic cell, soldered at the bottom of the primary mirror, located at two Receiving the sunlight reflected by the secondary mirror on the exiting light path of the secondary mirror; the selected photovoltaic cell is a plurality of photoelectric conversion batteries such as a gallium arsenide battery, a single crystal silicon concentrating battery, a CIGS concentrating thin film battery, and the like . An auxiliary concentrator is disposed around the photovoltaic cell to reflect a portion of the light that is not directly incident into the photovoltaic cell device to increase the tolerance of the incident light.

In a further implementation manner, the photovoltaic cell device includes at least two photovoltaic cells disposed on the primary mirror, and a thin insulating heat conduction between the plurality of photovoltaic cells and the primary mirror The layers, the plurality of photovoltaic cells are connected in series and in parallel to form a photovoltaic cell group, and receive the sunlight reflected by the secondary mirror; reduce the generated high current by the series-parallel combination, and reduce the voltage drop and power loss during the conduction process.

In a further embodiment, the photovoltaic device may further include a substrate disposed at a bottom of the primary mirror on a path of the exiting light of the secondary mirror; wherein at least two photovoltaic cells are disposed on Above the substrate; and a thin insulating and thermally conductive layer is disposed between the plurality of photovoltaic cells and the substrate.

In a further embodiment, the substrate is a metal substrate.

Preferably, the metal substrate is an aluminum or copper alloy substrate.

In a further embodiment, the concentrating solar device further includes a heat dissipating device disposed on the back of the substrate, and the metal stamping sheet of the primary mirror and the other bottom metal stamping sheet composite hollow And the hollow portion is filled with a medium.

In a further embodiment, the bottom metal stamped sheet forms a relief point during stamping and a concave and convex fin structure of a certain size inward or outward to increase the heat dissipation area.

In a further embodiment, fins of a certain size (welding or bonding or crimping, etc.) are disposed downwardly on the outer surface of the bottom metal stamping sheet to increase the heat dissipation area.

In a further embodiment, the bottom metal stamping sheet is stamped when stamping A rib of a certain size is formed upward to enhance the mechanical strength of the heat sink. The two layers of the mirror sheet and the bottom sheet are fixedly connected by bumps and/or embossed fins of the bottom layer by welding or bonding to increase the overall strength.

In a further implementation, one of the positive and negative poles of the output of the photovoltaic cell stack is coupled to a metal mirror structure to transfer electrical energy out of the cell.

In a further implementation manner, the medium selects a medium having a low boiling point near atmospheric pressure, and the medium receives excess heat of the photovoltaic cell, and at a lower temperature point, for example, within 100 ° C, the phase changes to a gaseous state to a high end. It runs, cools to a liquid state, and then flows back to the bottom of the heat sink to quickly complete a single heat-dissipation cycle with excellent heat transfer and diffusion properties. It should be specially pointed out that the entire heat-dissipation cycle of the heat sink is completed in a pressure range of approximately one atmosphere, specifically 0.75 to 1.25 atmospheres. The space structure formed by the two-layer thin plate of the heat sink is not intentionally added by increasing the thickness. Large pressure bearing capacity to save material cost, and make the endothermic phase transition temperature point basically constant, and the heat dissipation effect is stable.

Preferably, the medium is acetone or ethanol or water.

Preferably, the medium is a mixture of two or three of acetone, ethanol and water.

Preferably, the medium has an additive such as a corrosion inhibitor.

In a further embodiment, the concentrating solar device is a two-dimensional point photovoltaic concentrating device, wherein a curved mirror surface of the primary mirror is obtained by rotating a part of a parabola about a rotation axis parallel to a central axis thereof. Having a focal point or a circular focal line; the face shape of the curved mirror can be obtained by cutting a rotating paraboloid in the direction of the rotation axis by a different shape structure, for example, a circular shape, an elliptical shape or a rectangular shape.

In a further embodiment, the curved mirror of the secondary mirror is obtained by fitting a continuous straight line in at least one plane, so that the light passes through the secondary mirror and the convergence point is diverged to obtain a more uniform hook on the receiving surface. The sun's rays are incident.

In a further embodiment, the curved mirror of the secondary mirror is a cylindrical mirror, and the cross-sectional surface is a paraboloid, an elliptical surface or a part of a hyperbola, or is obtained by fitting a plurality of straight lines.

In a further embodiment, the concentrating solar device is a one-dimensional linear photovoltaic concentrating device, wherein the curved mirror of the primary mirror is a cylindrical mirror, and the cross-sectional shape is a parabolic type. A combination of points or other converging faces or multiple converging faces.

Preferably, in the above-described one-dimensional linear concentrating device, the receiving device portion is provided with an auxiliary concentrator in another dimension parallel to the linear focal line and perpendicular thereto, formed in a dimension along the linear focal line The ability to concentrate, increase the concentrating factor, simplify the tracking drive structure, reduce costs and increase reliability.

In a further embodiment, the concentrating solar device can be applied to the field of solar thermal field, the receiving device is a heat collecting device, and the heat collecting device is arranged at the bottom of the concentrating solar device to realize large-size design and large thickness. Thermal insulation package.

In a further embodiment, the concentrating solar devices can be arranged in an array to achieve a standardized unified tracking.

Compared with other solar tracking systems, the invention has the following advantages: 1. The space with closed concentrating and receiving, reliable structural performance, high strength, easy external cleaning, low cost and long service life; 2. Mirror structure metal sheet stamping obtained, cost Low, high precision; 3, can be array mounted, scaled applications; 4, good heat dissipation, stable performance, low cost, to ensure battery efficiency and longevity. DRAWINGS

Specific embodiments of the present invention will now be described in more detail with reference to the accompanying drawings in which:

1 is a schematic structural view of a concentrating solar device of the present invention;

2 is a schematic structural view of an embodiment of the present invention applied to the field of photovoltaics;

3 is a schematic structural view of another embodiment of a photovoltaic cell device of the present invention;

4a is a schematic structural arrangement diagram of a concentrating solar device of the present invention;

4 is a schematic structural view of another embodiment of the concentrating solar device of the present invention; FIG. 5 is a schematic structural view of a concentrating solar device according to another embodiment of the present invention; FIG.

Figure 7 is a schematic view showing the structure of an embodiment of the present invention applied to the field of photothermal.

Description of the drawings: 1. Concentrating solar device; 2. Mirror structure; 3. Primary reflection Mirror; 4, secondary mirror; 5, receiving device; 6, cover glass; 7, support structure; 8, rigid support member; 9, photovoltaic cell device; 10, substrate; 1 1, photovoltaic cell; Condenser; 13, heat sink; 14, ribs; 15, metal fins; 16, heat collecting device. detailed description

1 is a schematic view showing the structure of a concentrating solar device of the present invention. 1 is a schematic view showing the structure of a cross section or a rotating cross section of a concentrating solar device 1, mainly comprising a mirror structure 2, a receiving device 5 and a cover glass 6, wherein the mirror structure 2 is composed of two curved mirrors, one for each time. Mirror 3 and secondary mirror 4. The primary mirror 3 is obtained by stamping and coating a metal sheet; and has a ring-shaped focal line; the secondary mirror 4 is disposed in the space of the primary mirror and located at two positions adjacent to the parallel focal line or the annular focal line. The layout helps to improve the angular tolerance of the entire optical system and reduce the pressure required for the accuracy of the mechanical tracking system. In practical use, the curved mirror of the primary mirror 3 is a part of the paraboloid, and the curved mirror section of the secondary mirror 4 is designed to fit at least one continuous straight line in the same plane, which can obtain more uniform sunlight incidence; The receiving device 5 is disposed at a position on the path of the reflected light of the secondary mirror 4; the top of the mirror structure 2 is a cover glass, and is supported by a metal support structure vertically disposed at the bottom and/or the side of the curved mirror of the primary mirror 3. 7 supported; wherein the mirror structure 2, the receiving device 5 and the cover glass 6 constitute a closed concentrating unit; the overall mechanical structure of the closed concentrating unit has a certain compressive performance, and can resist internal pressure caused by changes in external temperature The inside of the closed concentrating unit is filled with a shielding gas, which isolates the contact between the mirror reflection layer and the external water vapor, maintains the cleanliness and performance stability of the reflective layer, and protects the battery sheet from damage and reduces the packaging cost; Reduce the processing requirements and manufacturing costs of the mirror and receiver of the mirror structure mirror, while maintaining High specular reflectance and a battery receiving rate; poly sealed light unit disposed pressure balance means can continue to guarantee the composition and pressure of the protective gas inside, to ensure the life of the condensing means.

2 is a schematic view showing the structure of an embodiment of the present invention applied to the field of photovoltaics. The concentrating solar device can be applied to the field of two-dimensional point concentrating solar photovoltaic, wherein the receiving device is a photovoltaic cell device 9, which includes a substrate 10, a photovoltaic cell 11 and an auxiliary concentrator 12, The substrate 10 is disposed at the bottom of the primary mirror 3, in the vicinity of the reflected light path of the secondary mirror 4, usually an aluminum alloy or a copper alloy metal substrate 10; two or more photovoltaic cells 11 are arranged on the substrate and are mutually stringed In parallel, a photovoltaic cell is formed to receive the sunlight reflected by the secondary mirror 4; the auxiliary concentrator 12 surrounds the photovoltaic cell, and the sunlight that is not directly incident on the photovoltaic device 9 is reflected again to the photovoltaic device 9. In actual operation, a thin insulating and thermally conductive layer is disposed between the photovoltaic cell and the substrate 10, and the thin insulating and thermally conductive layer has good insulation effect and good thermal conductivity; and the photovoltaic design is very clever due to the structural design. The positive and negative poles can be respectively connected to the metal supporting structure 7 supporting the cover glass 6 and the metal mirror structure 2, and the received electric energy is sent out. Since the two parts of the metal structure are large in size, the on-resistance is small. Can effectively reduce the pressure drop and energy loss. In order to facilitate the processing of the structure, the auxiliary concentrator 12 is designed as a cylindrical surface, which is simple in manufacture, convenient in installation, and improves the light-emitting property of the photovoltaic cell, the concentrating magnification, and the tolerance of the incident light. Preferably, the photovoltaic cell device 9 as a receiving device may not be provided with the substrate 10,

3 is a schematic structural view of another embodiment of a photovoltaic cell device of the present invention. As shown in FIG. 3, the photovoltaic battery pack is applied to a two-dimensional point concentrating solar photovoltaic field, wherein a photovoltaic cell device 9 includes a monolithic photovoltaic cell 11 and an auxiliary concentrator 12, wherein the photovoltaic cell 11 Arranged at the bottom of the primary mirror 3 (not shown), located near the reflected ray path of the secondary mirror 4 (not shown); the auxiliary concentrator 12 is disposed around the monolithic photovoltaic cell 11, its shape Regarding the shape of the monolithic photovoltaic cell 11, as shown in FIG. 3, the inside of the auxiliary concentrator 12 is an equi-angular cylindrical mirror, and the sunlight that is not directly incident on the photovoltaic cell device 9 is reflected again and then incident on the photovoltaic cell. In the device 9, the uniformity of the photovoltaic cell is increased, the concentrating ratio is increased, and the tolerance of the incident light is increased; and the monolithic photovoltaic cell 11 is directly disposed at the bottom of the primary mirror 3, which requires the unevenness of the light. Lower, one pole of the two electrodes of the photovoltaic cell 11 can be directly connected to the metal primary mirror 3, and the generated electric energy is sent out of the system with low loss.

4a is a schematic view showing the structure array arrangement of the two-dimensional point photovoltaic concentrating solar device of the present invention. As shown in FIG. 4a, in a two-dimensional point concentrating device, a curved mirror surface of a primary mirror is obtained by rotating a part of a parabola about a rotation axis parallel to a central axis thereof, and has a focus or a circular focal line; That is, the shape of the curved mirror can be obtained by cutting a rotating paraboloid in the direction of the rotation axis by a different shape structure, for example, a circular shape, an elliptical shape or a rectangular shape. The plurality of mirror structures 2 of the array of concentrating solar devices 1 are, for example, 2-1, 2-3 regular arrays are covered by cover glass 6 covered by a top arrangement, a plurality of arrays of primary mirrors 3, and a cover plate The sealed space formed by the glass 6 is fixed and supported by the support structure 7 and the rigid support structure 8 of the back to form a closed concentrating unit combination, wherein the rigid support structure 8 preferably adopts a tempered glass plate of a plate-like structure.

Figure 4b is a schematic view showing the structure of another embodiment of the two-dimensional point photovoltaic concentrating solar device of the present invention. As shown in FIG. 4b, a plurality of the mirror structures 2, such as 2-1, 2-2, are stamped on the same large metal sheet to form a large array of large primary mirrors 3, and covered with a primary mirror. The upper glass cover constitutes a concentrating unit combination.

The concentrating devices described in Figures 4a and 4b can be arranged in an array, scaled up, and tracked in a unified manner (as long as a certain driving device drives the concentrating device to meet the sun's normal incidence of the mirror structure to complete tracking).

FIG. 5 is a schematic structural view of a concentrating solar device according to another embodiment of the present invention. As shown in Fig. 5, sunlight is incident on the primary mirror 3 having the cylindrical surface through the cover glass 6 (not shown) and is concentrated at the linear focal line position. The secondary mirror 4 is disposed near the focal line of the primary mirror 3, and reflects the incident solar light to the vicinity of the bottom of the primary mirror 3; the receiving device of the concentrating solar device 1 is a linearly arranged photovoltaic cell device 9 disposed at The reflected light path of the secondary mirror 4 is near receiving sunlight, and continuously converts sunlight into electrical energy. The primary mirror 3, the photovoltaic cell device 9 and the cover glass 6 constitute a closed concentrating unit; the sealed concentrating unit is internally filled with a shielding gas for isolating the contact between the reflective reflecting layer and the external water vapor, and keeping the reflective layer clean. Degree and performance stability, while protecting the battery from damage and reducing packaging costs, reducing the processing requirements and manufacturing cost of the mirror and receiving device of the mirror structure mirror, while maintaining high efficiency of reflectivity and receiving rate; The air pressure balance device is arranged to continuously ensure the internal protective gas atmosphere and ensure the service life of the concentrating device. A plurality of photovoltaic cell devices, such as 9-5, 9-7 arrays, are linearly arranged to form an interconnected photovoltaic cell combination. In practice, the cross section of the primary mirror 3 is parabolic and has a linear focal line. The cross section of the secondary mirror 4 may be part of a parabolic shape, or may be part of an elliptical or hyperbolic shape. Or a plurality of straight line fitting lines; wherein the photovoltaic cell device 9 includes a substrate 10 (not shown), a photovoltaic cell 11 and an auxiliary concentrator 12; wherein the substrate 10 is disposed at the bottom of the primary mirror 3 , in the vicinity of the reflected light path of the secondary mirror 4, usually an aluminum alloy or a copper alloy metal substrate 10; a plurality of photovoltaic cells 11 are arranged on the substrate and connected in series and in parallel to form a photovoltaic battery for receiving secondary reflection The sunlight reflected by the mirror 4; the auxiliary concentrator 12, surrounding the photovoltaic battery pack and reflecting the sunlight not directly incident on the photovoltaic cell device 9 to the photovoltaic cell device; as shown, the auxiliary concentrator 12 includes two The distribution of the directions is an auxiliary concentrator 12-1 arranged in parallel along the linear focal line and an auxiliary concentrator 12-2 arranged in the vertical direction. The auxiliary concentrator 12-1 can tolerate a certain range. The light is incident so that the auxiliary concentrator 12-2 can converge the light in another dimension perpendicular to the convergence dimension of the primary mirror 3 without active tracking, on a linear focal line. A smaller number of photovoltaic cells 11 are arranged to achieve a higher concentration of light for the overall device. Reduce the active tracking of one dimension within the design scope, greatly improve the simplicity and practicability of the device, and is suitable for larger-scale promotion. In actual operation, a thin insulating and thermally conductive layer is disposed between the photovoltaic cell 11 and the substrate 10, and the thin insulating and thermally conductive layer has good insulation effect and has good thermal conductivity; the concentrating light for linear photovoltaic The solar device has many advantages over the point-type photovoltaic concentrating solar device (as described in Figures 3 and 4), such as excellent heat transfer performance, and the advantages of the positive and negative pole wiring of the photovoltaic battery pack, etc. description.

Fig. 6 is a schematic view showing a heat dissipation structure of an embodiment of the present invention. The heat sink of the concentrating solar device can be applied not only to the linear one-dimensional concentrating solar photovoltaic power generation device but also to the point two-dimensional concentrating solar photovoltaic power generation device, and FIG. 6 is a schematic diagram of the cross section or the rotating sectional structure of the heat dissipation device 13 The heat sink 13 is disposed on the back of the photovoltaic cell structure. For better heat dissipation, the design is composed of a metal stamped sheet of the primary mirror 3 and another metal stamped sheet composite hollow; in actual operation, the bottom metal stamped sheet is stamped. When the concave and convex points are formed and the fins 15 of a certain size are formed downward to increase the heat dissipation area, or the bottom metal stamping sheets are arranged with the fins 15 of a certain size downward to increase the heat dissipation area. In order to increase the mechanical strength of the heat sink 13, The bottom metal stamping sheet is stamped to form a rib 14 of a certain size upward. The hollow portion of the heat sink 13 is filled with a medium; the medium may be a low-boiling liquid medium in the vicinity of normal pressure. In actual operation, the low-boiling liquid medium may be acetone or ethanol water, or a mixture of two or three; the medium receives excess heat of the photovoltaic cell 11, at a lower temperature point, for example, within 100 ° C (acetone) 56.5 °C), the phase change absorbs heat, turns into a gaseous state to run to the high end, cools to a liquid state, and then returns to the bottom of the heat sink 13 to complete a heat dissipation cycle in a short time, so that the photovoltaic cell 11 is continuously ensured. Normal operating temperature and service life. It should be particularly pointed out that the entire heat dissipation cycle of the heat sink 13 is completed within a certain pressure range, for example, near an atmospheric pressure, specifically 0.75 to 1.25 atmospheres, and the inner and outer metal sheets are not intentionally provided with pressure support.

Figure 7 is a schematic view showing the structure of an embodiment of the present invention applied to the field of photothermal. The embodiment of the concentrating solar device 1 is applied to the field of photothermal, and the receiving device is arranged with a heat collecting device 16, as shown in Fig. 7, a plurality of mirror structures 2 are linearly arranged, for example, 2-1 and 2-3, having a certain distance a plurality of focal points of the distance, the heat collecting device 16 is linearly arranged along the plurality of focusing points, and receives the light concentrated by the mirror device 2; in actual operation, the mirror structure 2 is composed of the primary mirror 3 and the secondary mirror 4. (not shown in detail in the figure), the top is covered by the cover glass 6, blocking the air and water and the inside is filled with protective gas, etc., to protect the internal structure of the mirror structure 2, to ensure efficient operation accuracy and extended use; The heat collecting device 16 receives only a limited amount of heat at a certain convergence point within a certain length, and the outside of the heat collecting device 16 can be wrapped with a low thermal conductivity material in all areas except several receiving points in order to maintain less heat loss. Furthermore, since the heat collecting device 16 is disposed at the lower portion of the concentrating solar device 1, there is no problem of shading and light blocking, and the volume can be made large, for large size storage. Heat.

It will be apparent that the invention described herein can be varied in many ways without departing from the true spirit and scope of the invention. Therefore, all changes that are obvious to those skilled in the art are intended to be included within the scope of the claims. The scope of the invention is intended to be limited only by the scope of the appended claims.

Claims

Claim

A concentrating solar device comprising a mirror structure (2), a receiving device (5) and a cover glass (6), characterized in that: the mirror structure (2) comprises a primary mirror for receiving sunlight (3) and a secondary mirror (4) that receives the solar ray reflected by the primary mirror (3), the secondary mirror (4) being disposed in the space of the primary mirror (3), The receiving device (5) is arranged at the bottom of the primary mirror (3) and is located at a position of the secondary mirror (4) reflecting the light path, receiving the sun reflected by the secondary mirror (4) Light, the mirror structure (2), the receiving device (5) and the cover glass (6) constitute a closed concentrating unit.

2. A concentrating solar device according to claim 1, characterized in that the primary mirror (3) has an annular focal line or two mutually parallel focal lines.

3. A concentrating solar device according to claim 1, characterized in that said mirror structure (2) comprises a plurality of primary mirrors (3) arranged in an array of said plurality of primary mirrors (3).

4. A concentrating solar device according to claim 3, characterized in that said plurality of primary mirrors (3) are covered by a complete cover glass (6).

The concentrating solar device according to claim 3, wherein the plurality of primary mirrors (3) are stamped from a metal plate.

The concentrating solar device according to claim 1, characterized in that the back of the hermetic concentrating unit is provided with a rigid supporting member (8).

7. A concentrating solar device according to claim 6, wherein: said rigid supporting member (8) is a plate-like structure.

8. A concentrating solar device according to claim 6, wherein: said rigid supporting member (8) is a tempered glass plate.

9. A concentrating solar device according to claim 1, characterized in that the section of the curved mirror of the secondary mirror (4) is at least one continuous straight line fit in the same plane.

10. The concentrating solar device according to claim 1, wherein the sealed concentrating unit is internally filled with a shielding gas.

The concentrating solar device according to claim 1, wherein a gas pressure balancing device is provided in the sealed concentrating unit.

12. A concentrating solar device according to claim 1, characterized in that the receiving device (5) is a photovoltaic cell device (9) comprising a monolithic photovoltaic cell at the bottom of the primary mirror (3) (11) And an auxiliary concentrator (12); the auxiliary concentrator (12) is arranged around the photovoltaic cell (11).

13. The concentrating solar device according to claim 1, wherein: the receiving device (5) is a photovoltaic cell device (9) comprising at least two photovoltaic cells at the bottom of the primary mirror (3) (11) and an auxiliary concentrator (12), the auxiliary concentrator (12) is disposed around the photovoltaic cell (11), and the photovoltaic cell (11) and the primary mirror (3) A thin insulating thermally conductive layer is placed between the bottoms.

14. The concentrating solar device according to claim 1, wherein: the receiving device (5) is a photovoltaic cell device (9), comprising a substrate (10), at least two photovoltaic cells

(11) and an auxiliary concentrator (12); the auxiliary concentrator (12) is located around the photovoltaic cell (11) and between the photovoltaic cell (11) and the substrate (10) Set a thin insulating thermal layer.

The concentrating solar device according to claim 14, wherein the substrate (10) is a metal substrate.

16. A concentrating solar device according to claim 12, characterized in that one of the positive and negative poles of the photovoltaic cell (11) is connected to the mirror structure (2).

17. A concentrating solar device according to claim 12, characterized in that said solar device comprises a heat sink (13), said heat sink (13) being stamped by a metal sheet and bottom of said primary mirror (3) a metal stamped sheet composite hollow structure, the metal stamped sheet forms a concave-convex point during stamping, and the bottom metal stamped sheet is formed with a reinforcing rib (14) upwardly and a fin (15) formed downward during pressing, the composite The hollow portion is filled with a medium.

18. A concentrating solar device according to claim 17, wherein: said medium is a low boiling liquid medium under normal pressure.

19. The concentrating solar device of claim 18, wherein: said low The boiling point liquid medium is a mixture of one or more of acetone, ethanol or water.

The concentrating solar device according to claim 17, wherein the low-boiling liquid medium is added with a force-adding agent.

The concentrating solar device according to claim 1, characterized in that the receiving device (5) is a heat collecting device (16).

The concentrating solar device according to claim 1, wherein the concentrating solar device can be arranged in an array to realize large-scale unified tracking.