Solar energy utilization device

1 . A solar energy utilization device, comprising:

a light energy utilization unit having a first light energy utilization part which is basically flat and a second light energy utilization part arranged back to back with the first light energy utilization part, wherein the first and second light energy utilization parts are capable of receiving, converting and utilizing sunlight;

two convex light concentrating units, each being a solid lens or an accommodating cavity filled with a transparent liquid, wherein each of the two convex light concentrating units having a tilt light-transmissive convex sidewall capable of transmitting the sunlight to the solid lens or the transparent liquid and having a basically flat bottom, the first light energy utilization part fits the bottom of one of the two convex light concentrating units, the second light energy utilization part fits the bottom of the other convex light concentrating unit, the sunlight in any of the two convex light concentrating units transmitted from the solid lens or the transparent liquid to the light-transmissive convex sidewall forms a total reflection phenomenon such that the sunlight is concentrated onto the respective light energy utilization part;

further comprising a reflecting part and a support structure, wherein the two convex light concentrating units and the light energy utilization unit are supported by the support structure, the reflecting part is arranged below the two convex light concentrating units and the light energy utilization unit to allow the sunlight to be reflected to any of the two convex light concentrating units.

2 . The solar energy utilization device according to claim 1 , wherein each of the two convex light concentrating units has a light-transparent bottom wall, and the respective light energy utilization part fits the outer side of the light-transparent bottom wall, or

wherein the first or second light energy utilization part forms a bottom wall of the respective convex light concentrating unit.

3 . The solar energy utilization device according to claim 1 , wherein any of the two convex light concentrating units is provided therein with a light guide,

wherein the light guide is a Fresnel lens,

wherein the Fresnel lens is arranged vertically with respect to a light-receiving surface of the respective light energy utilization part.

4 . The solar energy utilization device according to claim 1 , further comprises: a light guide arranged on an outer side of any of the two convex light concentrating units and configured for guiding the sunlight to its light-transmissive convex sidewall.

5 . The solar energy utilization device according to claim 4 , wherein the light guide is a reflector arranged on one or both sides of any of the two convex light concentrating units, with a reflective surface of the reflector facing toward the convex light concentrating unit.

6 . The solar energy utilization device according to claim 1 , wherein the reflecting part is a Fresnel lens reflecting surface or a curved mirror.

7 . The solar energy utilization device according to claim 1 , wherein any of the two convex light concentrating units is provided with an external interface for the access of the transparent liquid.

8 . The solar energy utilization device according to claim 1 , wherein a longitudinal cross-section of each convex light concentrating unit is a polygon, and the number of sides of the polygon is greater or equal to three.