A solar light concentration principle verification system

Abstract

The present invention discloses a solar light concentrating principle verification system, comprising: a primary mirror unit, a secondary mirror unit, a support fixture unit, a system computer, and an electrical box. The system computer is connected to the electrical box, which is connected to the primary mirror unit. Both the primary and secondary mirror units are connected to the support fixture unit. The system computer, via the electrical box, controls the primary mirror unit to deploy to a preset calibration position. Parallel light then perpendicularly illuminates the primary mirror unit. After being reflected twice by the primary and secondary mirror units, the collimation and spot energy density of the emitted, contracted parallel light are measured. This invention reduces the overall machining and assembly difficulty of ground-based prototypes and can verify the feasibility of deploying a large-aperture deployable solar light concentrating system in space.

Description

Technical Field

[0001] The present invention belongs to the technical field of sunlight concentrating by applying spatial large-aperture spliced reflectors, and in particular relates to a sunlight concentrating principle verification system. Background Art

[0002] In order to verify the technical feasibility of a solar concentrating system using large-aperture spliced mirrors in space, it is necessary to build a ground-based experimental system for the principle of solar concentrating. Currently, there is no solar concentrating verification system for large-aperture spliced mirrors, which makes it impossible to effectively evaluate and verify their application performance in a space environment, and it is impossible to promptly discover and eliminate deficiencies at the principle level. Summary of the Invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the existing technology, provide a solar light concentration principle verification system, reduce the difficulty of overall processing and assembly of the ground principle prototype, and verify the feasibility of the deployment plan of a large-aperture deployable solar light concentration system in space.

[0004] The objectives of the present invention are achieved through the following technical solutions: A sunlight concentration principle verification system, comprising: a primary mirror unit, a secondary mirror unit, a supporting tooling unit, a system computer and an electrical box; wherein, the system computer is connected to the electrical box; the electrical box is connected to the primary mirror unit; the primary mirror unit and the secondary mirror unit are both connected to the supporting tooling unit; after the system computer controls the primary mirror unit to unfold to a preset calibration position through the electrical box, parallel light is vertically irradiated on the primary mirror unit, and after being reflected twice by the primary mirror unit and the secondary mirror unit, the collimation of the output shrinkage parallel light and the energy density of the light spot are measured.

[0005] In the above-mentioned sunlight concentration principle verification system, the main mirror unit includes a central mounting flange, a fixed sub-mirror, an L-shaped connecting plate, a deployable sub-mirror, and a support assembly; wherein the central mounting flange is connected to the support fixture unit; and the fixed sub-mirror is connected to the central mounting flange via the L-shaped connecting plate.

[0006] The deployable sub-mirror is connected to the central mounting flange via the support assembly.

[0007] In the above-mentioned sunlight concentration principle verification system, the number of the fixed sub-mirrors is five, and the six sub-mirrors consisting of five fixed sub-mirrors and one fixed sub-mirror are evenly distributed along the circumference of the central mounting flange.

[0008] In the above-mentioned sunlight concentration principle verification system, the support assembly includes a mirror base cover, a mirror base, a boss with a flange, an L-shaped mirror base, a hinge and an unfolding mechanism; wherein, the unfoldable sub-mirror is arranged inside the mirror base; the mirror base cover is connected to the end face of the mirror base, and the mirror base cover is pressed against the boss of the unfoldable sub-mirror; the middle part of the mirror base is connected to one end of the boss with a flange; the other end of the boss with a flange is connected to one end of the unfolding mechanism through the L-shaped mirror base; the other end of the unfolding mechanism is connected to the supporting tooling unit; the bottom of the L-shaped mirror base is connected to the central mounting flange through the hinge.

[0009] In the above-mentioned sunlight concentration principle verification system, the secondary mirror unit includes a secondary mirror, a wedge-shaped support block, a first rod joint, a second rod joint, a carbon fiber tube, a secondary mirror support tooling and a secondary mirror support assembly; wherein, the secondary mirror is connected to the wedge-shaped support block through the secondary mirror support assembly; the wedge-shaped support block is connected to one end of the carbon fiber tube through the first rod joint; and the other end of the carbon fiber tube is connected to the secondary mirror support tooling through the second rod joint.

[0010] In the above-mentioned sunlight concentration principle verification system, the secondary mirror support assembly includes a secondary mirror support frame, an adapter plate and a three-dimensional precision adjustment slide; wherein, the secondary mirror is arranged at the middle opening position of the secondary mirror support frame; the secondary mirror support frame is connected to the adapter plate; the adapter plate is arranged on the upper part of the three-dimensional precision adjustment slide; the bottom of the three-dimensional precision adjustment slide is connected to the wedge-shaped support block.

[0011] In the above-mentioned sunlight concentration principle verification system, the three-dimensional precision adjustment slide can provide translational precision adjustment of the three degrees of freedom of X, Y, and Z, and the secondary mirror support frame can realize the swing angle adjustment of the X and Y axes.

[0012] In the above-mentioned sunlight concentration principle verification system, the back of the deployable sub-mirror is in contact with the finely ground circular surface of the mirror base, and the uncontacted gap is filled with epoxy resin glue.

[0013] In the above-mentioned sunlight concentration principle verification system, the inner diameter of the mirror base is Φ160mm-Φ165mm.

[0014] In the above-mentioned sunlight converging principle verification system, when parallel light vertically illuminates the primary mirror unit, it is reflected twice by the primary mirror unit and the secondary mirror unit, thereby achieving sunlight converging. The constraints between the primary mirror unit size, the secondary mirror unit size and the light spot energy density, and the collimation of the output beam-shrinking parallel light and the light spot energy density are as follows:

[0015]

[0016]

[0017]

[0018]

[0019] Among them, S1 and S2 are the primary mirror area and spot area respectively, D1 and D2 are the primary mirror unit aperture and spot diameter respectively, W1 and W2 are the spot energy density and input energy density respectively, δ is the angular radius, P is the axial distance, C 光学 、C 几何 are the optical concentration ratio and the geometric concentration ratio, respectively.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The main mirror unit of the present invention includes a group of deployable sub-mirror units and five groups of fixed sub-mirror units. The feasibility of the deployment mechanism is verified by using a group of deployable sub-mirror units, which reduces the overall processing and assembly difficulty of the ground prototype.

[0022] (2) The support method of the mirror body of the deployable sub-mirror unit of the present invention can ensure the position accuracy of the sub-mirror and reduce the processing difficulty compared with the back flexible joint support method;

[0023] (3) The secondary mirror of the present invention is designed with a platform structure, the boss is placed on the mirror frame and fixed by locking screws distributed perpendicular to the axis, and the mirror frame is designed with pitch and yaw adjustment screws to achieve two-dimensional rotation adjustment;

[0024] (4) The secondary mirror frame of the present invention is connected to the three-dimensional precision adjustment slide through an adapter plate, which can provide three-degree-of-freedom translational precision adjustment requirements and cooperate with the frame adjustment screws to meet the five-degree-of-freedom posture adjustment requirements of the sub-mirror. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 Schematic diagram of the structure of a sunlight concentration principle verification system provided by an embodiment of the present invention;

[0027] Figure 2 is another structural schematic diagram of a sunlight concentration principle verification system provided by an embodiment of the present invention;

[0028] Figure 3 is a cross-sectional view of a support structure for a deployable sub-mirror unit provided by an embodiment of the present invention;

[0029] Figure 4 is a cross-sectional view of a secondary mirror support structure provided by an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of a secondary mirror unit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] In order to verify the technical feasibility of a solar concentrating system using large-aperture space-based spliced reflectors, it is necessary to build a ground-based experimental system for the principle of solar concentrating. Through simulation and experimentation of the prototype, its performance can be effectively evaluated and verified, and deficiencies at the principle level can be promptly discovered and eliminated. The experiment tests the collimation of the outgoing beam and the energy density of the concentrated spot, and further calculates the system's concentration ratio. By comparing it with the design indicators, its satisfaction can be analyzed. The key technical issues that need to be solved in the development of a solar concentrating principle verification system are to ensure that the beam collimation and spot energy density meet the design concentration ratio indicator requirements.

[0033] Figure 1 Schematic diagram of the structure of a sunlight concentration principle verification system provided by an embodiment of the present invention; Figure 2 FIG. 1 is another structural diagram of a system for verifying the principle of sunlight concentration provided by an embodiment of the present invention. Figure 1 and Figure 2 As shown, the solar light concentration principle verification system is characterized by comprising: a primary mirror unit 1, a secondary mirror unit 2, a support tooling unit 3, a system computer 4 and an electrical box 5; wherein,

[0034] The system computer 4 is connected to the electric box 5 ; the electric box 5 is connected to the primary mirror unit 1 ; the primary mirror unit 1 and the secondary mirror unit 2 are both connected to the supporting fixture unit 3 .

[0035] After the system computer 4 controls the primary mirror unit 1 to deploy to a preset calibration position via the electrical box 5, parallel light is directed perpendicularly to the primary mirror unit 1. After being reflected twice by the primary mirror unit 1 and the secondary mirror unit 2, the collimation and energy density of the outgoing, reduced-beam parallel light are measured, and the system's concentration ratio is calculated. If the concentration ratio calculated from actual measurements is not less than the theoretically calculated concentration ratio, the solar light concentrating system solution is proven to be feasible.

[0036] The constraints on the primary and secondary mirror sizes and the spot energy density, and the collimation of the outgoing beam and the spot energy density are as follows:

[0037]

[0038]

[0039]

[0040]

[0041] Among them, S1 and S2 are the primary mirror area and spot area respectively, D1 and D2 are the primary mirror aperture and spot diameter respectively, W1 and W2 are the spot energy density and input energy density respectively, δ is the angular radius, which is used to evaluate the collimation of the system's output light, P is the axial distance, C 光学 、C 几何 are the optical concentration ratio and the geometric concentration ratio, respectively.

[0042] This set of formulas is used to design the solar concentration ratio and support the optimization of the solar concentration system solution.

[0043] like Figure 2 As shown, the main mirror unit 1 includes a central mounting flange 1-1, a fixed sub-mirror 1-2, an L-shaped connecting plate 1-3, a deployable sub-mirror 1-4 and a support assembly; wherein,

[0044] The central mounting flange 1-1 is connected to the supporting fixture unit 3; the fixed sub-mirror 1-2 is connected to the central mounting flange 1-1 through the L-shaped connecting plate 1-3; the deployable sub-mirror 1-4 is connected to the central mounting flange 1-1 through the supporting assembly.

[0045] The number of the fixed sub-mirrors 1-2 is five, and the six sub-mirrors consisting of five fixed sub-mirrors 1-2 and one fixed sub-mirror 1-2 are evenly distributed along the circumference of the central mounting flange 1-1.

[0046] The secondary mirror unit 2 includes a secondary mirror 2-1, a wedge-shaped support block 2-5, a first rod joint 2-6, a second rod joint 2-62, a carbon fiber tube 2-7, a secondary mirror support tooling 2-8 and a secondary mirror support assembly; wherein, the secondary mirror 2-1 is connected to the wedge-shaped support block 2-5 through the secondary mirror support assembly; the wedge-shaped support block 2-5 is connected to one end of the carbon fiber tube 2-7 through the first rod joint 2-6; the other end of the carbon fiber tube 2-7 is connected to the secondary mirror support tooling 2-8 through the second rod joint 2-62.

[0047] The secondary mirror support assembly includes a secondary mirror support frame 2-2, an adapter plate 2-3, and a three-dimensional precision adjustment slide 2-4; wherein the secondary mirror 2-1 is arranged at the central opening position of the secondary mirror support frame 2-2; the secondary mirror support frame 2-2 is connected to the adapter plate 2-3; the adapter plate 2-3 is arranged on the upper part of the three-dimensional precision adjustment slide 2-4;

[0048] The central mounting flange 1-1 in the primary mirror unit 1 is supported by the support fixture unit 3, and serves as a central fixed connection structure to provide a connection interface for the primary and secondary mirror assemblies; the primary mirror unit 1 is divided into a deployable sub-mirror 1-4 and a fixed sub-mirror 1-2, and the fixed sub-mirror 1-2 is connected and installed on the central mounting flange 1-1 through an L-shaped connecting plate 1-3; the secondary mirror unit 2 is supported by a secondary mirror support fixture 2-8, three carbon fiber tubes 2-7 with an outer diameter of 12 mm and a wedge-shaped support block 2-5, and the secondary mirror support fixture 2-8 and the carbon fiber tubes 2-7 are connected by a rod joint 2-6; the wedge-shaped support block 2-5 carries the three-dimensional precision adjustment slide 2-4, the adapter plate 2-3, the secondary mirror support frame 2-2, and the secondary mirror 2-1.

[0049] like Figure 3 As shown, the support assembly includes a mirror base cover 1-5, a mirror base 1-6, a boss with a flange 1-7, an L-shaped mirror base 1-8, a hinge 1-9 and an unfolding mechanism 1-10; wherein, the unfoldable sub-mirror 1-4 is arranged inside the mirror base 1-6; the mirror base cover 1-5 is connected to the end face of the mirror base 1-6, and the mirror base cover 1-5 is pressed against the boss of the unfoldable sub-mirror 1-4; the middle part of the mirror base 1-6 is connected to one end of the boss with a flange 1-7; the other end of the boss with a flange is connected to one end of the unfolding mechanism 1-10 through the L-shaped mirror base 1-8; the other end of the unfolding mechanism 1-10 is connected to the supporting tooling unit 3; the bottom of the L-shaped mirror base 1-8 is connected to the central mounting flange 1-1 through the hinge 1-9.

[0050] The deployable sub-mirror 1-4 can be regarded as an off-axis parabolic reflector, and its supporting components include a mirror base 1-6 and a mirror base cover 1-5. The deployable sub-mirror 1-4 has a diameter of 150mm and is designed with a Φ160mm boss structure. It is placed in a mirror base 1-6 with an inner diameter of Φ160mm, so that the back of the sub-mirror contacts the finely ground circular surface of the mirror base, and the non-contact surface is filled with epoxy resin glue. The mirror base cover 1-5 is connected to the end face of the mirror base 1-6 by screws to tighten the sub-mirror boss. The mirror base 1-6 is connected to the boss 1-7 with a flange by screws. The boss 1-7 with a flange is connected to the deployment mechanism 1-10 through an L-shaped mirror base 1-8, and the L-shaped mirror base 1-8 is provided with a hinge 1-9 connected to the center mounting flange 1-1. The folding and unfolding of the deployable sub-mirror 1-4 is completed under the drive of the deployment mechanism. This support method can ensure the position accuracy of the sub-mirror and reduces the processing difficulty compared to the back flexible joint support method.

[0051] like Figure 4As shown, the secondary mirror 2-1 has a diameter of 90 mm and is designed with a Φ100 mm boss structure. The boss is placed in the Φ100 mm secondary mirror frame 2-2 and is locked by locking screws distributed vertically along the axis. The secondary mirror frame 2-2 is designed with pitch and yaw adjustment screws to achieve two-dimensional swing angle adjustment of the secondary mirror.

[0052] like Figure 5 As shown, the secondary mirror frame 2-2 is connected to the three-dimensional precision adjustment slide 2-4 through the adapter plate 2-3. The three-dimensional precision adjustment slide 2-4 can provide translational precision adjustment of the three degrees of freedom of X, Y, and Z. The secondary mirror frame 2-2 can achieve swing angle adjustment of the X and Y axes through adjusting screws. The secondary mirror frame 2-2 and the three-dimensional precision adjustment slide 2-4 meet the five-degree-of-freedom posture adjustment requirements of the secondary mirror.

[0053] The main mirror unit of the present invention is modularly designed. The main mirror unit includes a group of deployable sub-mirror units and five groups of fixed sub-mirror units. The feasibility of the deployment mechanism is verified by a group of deployable sub-mirror units, which reduces the difficulty of overall processing and assembly of the ground prototype.

[0054] The mirror body of the deployable sub-mirror unit of the present invention is supported by a mirror seat and a mirror seat cover. The Φ150mm reflector is designed with a Φ160mm boss structure, which is placed in a mirror seat with an inner diameter of Φ160mm so that the back of the sub-mirror contacts the finely ground annular surface of the mirror seat. The mirror seat cover is connected to the end face of the mirror seat by screws to tighten the sub-mirror boss. This support method can ensure the position accuracy of the sub-mirror and reduces the processing difficulty compared to the back flexible joint support method.

[0055] The Φ90mm secondary mirror of the present invention is designed with a Φ100mm boss structure, which is placed on a Φ100mm mirror frame and fixed by locking screws distributed vertically along the axis. The mirror frame is also designed with pitch and yaw adjustment screws to achieve two-dimensional rotation adjustment.

[0056] The secondary mirror frame of the present invention is connected to the three-dimensional precision adjustment slide through an adapter plate, which can provide three-degree-of-freedom translational precision adjustment requirements and cooperate with the frame adjustment screws to meet the five-degree-of-freedom posture adjustment requirements of the sub-mirror.

[0057] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A solar light concentration principle verification system, characterized by include: A primary mirror unit (1), a secondary mirror unit (2), a support fixture unit (3), a system computer (4) and an electrical box (5); wherein, The system computer (4) is connected to the electrical box (5); The electrical box (5) is connected to the main mirror unit (1); The primary mirror unit (1) and the secondary mirror unit (2) are both connected to the supporting fixture unit (3); After the system computer (4) controls the primary mirror unit (1) to unfold to a preset calibration position through the electrical box (5), parallel light is vertically irradiated on the primary mirror unit (1), and after being reflected twice by the primary mirror unit (1) and the secondary mirror unit (2), the collimation degree of the output contracted parallel light and the energy density of the light spot are measured.

2. The solar light concentration principle verification system according to claim 1, characterized in that: The main mirror unit (1) comprises a central mounting flange (1-1), a fixed sub-mirror (1-2), an L-shaped connecting plate (1-3), a deployable sub-mirror (1-4) and a support assembly; wherein, The central mounting flange (1-1) is connected to the supporting fixture unit (3); The fixed sub-mirror (1-2) is connected to the central mounting flange (1-1) via the L-shaped connecting plate (1-3); The deployable sub-mirror (1-4) is connected to the central mounting flange (1-1) via the supporting assembly.

3. The solar light concentration principle verification system according to claim 2, characterized in that: The number of the fixed sub-mirrors (1-2) is five, and the six sub-mirrors consisting of the five fixed sub-mirrors (1-2) and one fixed sub-mirror (1-2) are evenly distributed along the circumference of the central mounting flange (1-1).

4. The solar light concentration principle verification system according to claim 2, characterized in that: The support assembly comprises a mirror base cover plate (1-5), a mirror base (1-6), a boss with a flange (1-7), an L-shaped mirror base (1-8), a hinge (1-9) and an unfolding mechanism (1-10); wherein, The deployable sub-mirror (1-4) is arranged inside the mirror base (1-6); The mirror base cover plate (1-5) is connected to the end surface of the mirror base (1-6), and the mirror base cover plate (1-5) is pressed against the boss of the deployable sub-mirror (1-4); The middle portion of the mirror base (1-6) is connected to one end of the boss (1-7) with a flange; The other end of the flanged boss (1-7) is connected to one end of the unfolding mechanism (1-10) via the L-shaped mirror base (1-8); The other end of the unfolding mechanism (1-10) is connected to the supporting tooling unit (3); The bottom of the L-shaped mirror base (1-8) is connected to the central mounting flange (1-1) via the hinge (1-9).

5. The solar light concentration principle verification system according to claim 1, characterized in that: The secondary mirror unit (2) comprises a secondary mirror (2-1), a wedge-shaped support block (2-5), a first rod joint (2-6), a second rod joint (2-62), a carbon fiber tube (2-7), a secondary mirror support tool (2-8) and a secondary mirror support assembly; wherein, The secondary mirror (2-1) is connected to the wedge-shaped support block (2-5) via the secondary mirror support assembly; The wedge-shaped support block (2-5) is connected to one end of the carbon fiber tube (2-7) via the first rod joint (2-6); The other end of the carbon fiber tube (2-7) is connected to the secondary mirror support fixture (2-8) via the second rod joint (2-62).

6. The solar light concentration principle verification system according to claim 5, characterized in that: The secondary mirror support assembly comprises a secondary mirror support frame (2-2), an adapter plate (2-3) and a three-dimensional precision adjustment slide (2-4); wherein, The secondary mirror (2-1) is arranged at a central opening position of the secondary mirror support frame (2-2); The secondary mirror support frame (2-2) is connected to the adapter plate (2-3); The adapter plate (2-3) is arranged on the upper part of the three-dimensional precision adjustment slide (2-4); The bottom of the three-dimensional precision adjustment slide (2-4) is connected to the wedge-shaped support block (2-5).

7. The solar light concentration principle verification system according to claim 6, characterized in that: The three-dimensional precision adjustment slide (2-4) can provide translation precision adjustment of the three degrees of freedom of X, Y, and Z, and the secondary mirror support frame (2-2) can realize swing angle adjustment of the two axes of X and Y.

8. The solar light concentration principle verification system according to claim 4, characterized in that: The back of the deployable sub-mirror (1-4) contacts the finely ground annular surface of the mirror base (1-6), and the uncontacted gap is filled with epoxy resin glue.

9. The solar light concentration principle verification system according to claim 4, characterized in that: The inner diameter of the mirror seat (1-6) is Φ160mm-Φ165mm.

10. The solar light concentration principle verification system according to claim 4, characterized in that: When parallel light vertically irradiates the primary mirror unit (1), it is reflected twice by the primary mirror unit (1) and the secondary mirror unit (2), thereby achieving sunlight convergence. The constraint relationships between the primary mirror unit size, the secondary mirror unit size and the light spot energy density, and the collimation of the output beam-shrink parallel light and the light spot energy density are as follows: Among them, S1 and S2 are the primary mirror area and spot area respectively, D1 and D2 are the primary mirror unit aperture and spot diameter respectively, W1 and W2 are the spot energy density and input energy density respectively, δ is the angular radius, P is the axial distance, C 光学 、C 几何 are the optical concentration ratio and the geometric concentration ratio, respectively.

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