Mechanical solar tracking and solar concentrator

• US 10,330,345 B1
• Filed: 04/28/2017
• Issued: 06/25/2019
• Est. Priority Date: 04/28/2016
• Status: Active Grant

• Current Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Original Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Inventors: Sanchez Vega, L. Rafael
• Primary Examiner(s): Baker, Lori L
• Application Number:
  US15/581,946
• Time in Patent Office: 788 Days
• Field of Search: 385 33, 2502034, 136246, 126424, 126440, 353 3, 188382, 4678
• CPC Class Codes: F24S 20/30 Solar heat collectors for heating objects, e.g. solar cookers or solar furnaces
• CPC Class Codes: F24S 2025/018 Means for preventing movements, e.g. stops
• CPC Class Codes: F24S 2030/11 Driving means
• CPC Class Codes: F24S 2030/115 Linear actuators, e.g. pneumatic cylinders
• CPC Class Codes: F24S 2030/14 Movement guiding means
• CPC Class Codes: F24S 2030/145 Tracks
• CPC Class Codes: F24S 2030/18 Load balancing means, e.g. use of counter-weights
• CPC Class Codes: F24S 23/31 having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F24S 30/452 Vertical primary axis
• CPC Class Codes: F24S 30/458 with inclined primary axis
• CPC Class Codes: F24S 50/20 for tracking
• CPC Class Codes: Y02E 10/47 Mountings or tracking

Abstract

A mechanical solar tracking and solar concentrating system having a Fresnel lens, moving frame, track, retaining mechanism, and solar collector. The lens focuses solar energy at the collector; the frame holds the collector and lens, keeping them aligned as the frame rotates; the track guides the frame to maintain a perpendicular orientation to the Sun; the solar collector receives the Sun'"'"'s rays; and the retaining mechanism releases at established intervals, allowing the frame to rotate to the next location. The cycle repeats, tracking the Sun and concentrating its rays at a focal point, to generate temperatures at the focal point in excess of 500° C. These high temperatures can be exploited in several applications, such as producing drinking water from dirty water; cooking food; disinfecting medical instruments; accelerating fermentation of certain types of flora to produce electricity; generating work for generic purposes; etc.

Claims

1. An apparatus for mechanically tracking the Sun and concentrating the Sun'"'"'s rays, comprising:

a lens that concentrates the Sun'"'"'s rays at a focal point;

a frame having a first end and a second end with the lens secured near the first end and a solar collector near the second end, wherein the solar collector is located at a distance from the lens that is generally equal to a focal length of the lens, the frame further including a vertical pivoting axis and a horizontal pivoting axis;

a tracking guide proximate the second end of the frame, the tracking guide having a plurality of stopping members spaced at predetermined intervals and at least one guiding member proximate the plurality of stopping members;

a retaining/releasing mechanism attached to the second end of the frame, the retaining/releasing mechanism adapted to engage and disengage with the plurality of stopping members;

an actuator in communication with the retaining/releasing mechanism, wherein the actuator is a pressure operated piston adapted to receive thermal energy received by the solar collector causing a piston rod to extend outward from the piston which in turn actuates the retaining/releasing mechanism and controls whether the retaining/releasing mechanism engages or disengages the plurality of stopping members; and

a biasing member applying a constant biasing force on the frame causing the frame to rotate about the vertical axis of the frame when the retaining/releasing mechanism is disengaged with the plurality of stopping members.

2. The apparatus as in claim 1, further comprising a timer in communication with the actuator, the timer controlling the actuation of the actuator.

3. The apparatus as in claim 1, further comprising:

the retaining/releasing mechanism having a piston rod that has a first position of repose and a second actuated position, wherein the movement of the piston rod between the first position and the second position is controlled by the actuator;

the first position of repose including the piston rod extended outward away from the lens at a distance that results in the piston rod contacting one of the plurality of stopping members when the frame rotates the piston rod into contact with one of the plurality of stopping members; and

the second actuated position including the piston rod retracted inward towards the lens such that the piston rod is incapable of contacting one of the plurality of stopping members.

4. The apparatus as in claim 3, further comprising:

the tracking guide having two guide members extending generally in parallel relation to each other with the plurality of stopping members intersecting a plane extending perpendicularly between the two guide members;

the stopping members distally located from the lens a distance greater than a distance between the lens and the two guide members; and

the retaining/releasing mechanism extending distally beyond the two guide members such that the retaining/releasing mechanism at least partially resides between the two guide members.

5. The apparatus as in claim 3, further comprising:

the retaining/releasing mechanism having a lever arm pivotally secured thereto with a first end of the lever in mechanical communication with the piston rod and a second free end, the piston rod thereby adapted to move the lever arm into a first extended position or a second retracted position;

the first extended position of the lever arm being achieved when the piston rod is in the first position of repose, the first extended position of the lever arm including the second free end of the lever arm extending distally beyond the plurality of stopping members such that the second free end is capable of contacting one of the plurality of stopping members; and

the second retracted position of the lever arm being achieved when the piston rod is in the second actuated position, the second retracted position of the lever arm including the second free end of the lever arm residing proximal the plurality of stopping members such that the second free end is incapable of contacting one of the plurality of stopping members.

6. The apparatus as in claim 3, further comprising:

the tracking guide having two guide members temporarily secured to a semi-spherical shell having a plurality of apertures equidistantly disposed therein, wherein the plurality of stopping members are each defined by a perimeter of one of the plurality of apertures;

the two guide members extending generally in parallel relation to each other;

the spherical shell located distally from the lens at a distance greater than a distance between the lens and the two guide members; and

the retaining/releasing mechanism extending distally beyond the two guide members such that the retaining/releasing mechanism at least partially resides between the two guide members.

7. The apparatus as in claim 1, wherein the retaining/releasing mechanism further comprises a lever arm in communication with the piston rod, wherein the translation of the piston rod moves the lever arm between contacting and non-contacting positions with respect to the stopping members, the contacting position preventing the frame from rotating about the vertical axis of the frame and the non-contacting position allowing the frame to rotate a predetermined distance about the vertical axis of the frame.

8. The apparatus as in claim 7, wherein the retaining/releasing mechanism further comprises the piston rod in communication with a valve on the piston, the piston rod adapted to open the valve to release the pressure within the piston when the piston rod extends past a predetermined threshold and close the valve when the piston rod is no longer extended beyond the threshold.

9. The apparatus as in claim 1, wherein the retaining/releasing mechanism further comprises a lever in communication with the actuator, the lever having an open position and a closed position, the actuator altering the lever between the closed and open positions in accordance with a programmable digital timer, and the closed position including the lever in position to contact one of the plurality of stopping members.

10. The apparatus as in claim 1, further comprising mechanisms for harnessing the energy of concentrated solar rays.

11. The apparatus as in claim 1, further comprising the lens being a Fresnel lens.

12. An apparatus for mechanically tracking the Sun and concentrating the Sun'"'"'s rays, comprising:

a Fresnel lens that concentrates the Sun'"'"'s rays at a focal point;

a frame having a first end and a second end with the Fresnel lens secured near the first end and a solar collector near the second end, wherein the solar collector is located at a distance from the Fresnel lens that is generally equal to a focal length of the Fresnel lens, the frame further including a vertical pivoting axis and a horizontal pivoting axis;

a tracking guide proximate the second end of the frame, the tracking guide having a plurality of stopping members at predetermined intervals and at least one guiding member in mechanical communication with the plurality of stopping members;

a retaining/releasing mechanism attached to the second end of the frame, the retaining/releasing mechanism adapted to engage and disengage with the plurality of stopping members;

the retaining/releasing mechanism having a piston rod that has a first position of repose and a second actuated position, wherein the movement of the piston rod between the first and second positions is controlled by an actuator;

the first position of repose including the piston rod extended outward away from the lens at a distance that results in the piston rod contacting one of the plurality of stopping members when the frame rotates the piston rod into contact with one of the plurality of stopping members;

the second actuated position including the piston rod retracted inward towards the lens such that the piston rod is incapable of contacting one of the plurality of stopping members;

the actuator in communication with the retaining/releasing mechanism, the actuator adapted to control whether the retaining/releasing mechanism engages or disengages with the plurality of stopping members;

a timer in communication with the actuator, the timer controlling the actuation of the actuator;

a biasing member applying a constant biasing force on the frame causing the frame to rotate about the vertical axis of the frame when the retaining/releasing mechanism is disengaged with the plurality of stopping members;

the tracking guide having two guide members extending generally in parallel relation to each other with the plurality of stopping members intersecting a plane extending perpendicularly between the two guide members;

the stopping members located distally from the lens at a distance greater than a distance between the lens and the two guide members; and

the retaining/releasing mechanism extending distally beyond the two guide members such that the retaining/releasing mechanism at least partially resides between the two guide members.

13. The apparatus as in claim 12, further comprising:

the retaining/releasing mechanism having a lever arm pivotally secured thereto with a first end of the lever in mechanical communication with the piston rod and a second free end, the piston rod thereby adapted to move the lever arm into a first extended position or a second retracted position;

the first extended position of the lever arm being achieved when the piston rod is in the first position, the first extended position of the lever arm including the second free end of the lever arm extending distally beyond the plurality of stopping members such that the second free end is capable of contacting one of the plurality of stopping members; and

the second retracted position of the lever arm being achieved when the piston rod is in the second actuated position, the second retracted position of the lever arm including the second free end of the lever arm residing proximal the plurality of stopping members such that the second free end is incapable of contacting one of the plurality of stopping members.

14. The apparatus as in claim 12, further comprising:

the tracking guide having two guide members temporarily secured to a semi-spherical shell having a plurality of apertures equidistantly disposed therein, wherein the plurality of stopping members are each defined by a perimeter of one of the plurality of apertures;

the two guide members extending generally in parallel relation to each other;

the spherical shell located distally from the lens at a distance greater than a distance between the lens and the two guide members.

15. The apparatus as in claim 12, further comprising mechanisms for harnessing the energy of concentrated solar rays.