HYBRID WIND AND SOLAR POWERED TURBINE; HYDO-TURBINE; AIR
COMPRESSOR; HYDRAULIC PUMP; AIR OR HYDRO-PROPELLER, HAVING
P OTABLE SHUTTERS OH A ROT TIHG DISK
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of applicant's U.S. Provisional Application Number 60/452,119 titled, "Hydraulic or pneumatical sail mechanism -- Improved method of power generation, refrigeration, pumping, and compression from wind energy, wave energy, or water current energy, via the use of sails constructed of electronically controlled rotatable and extendable shutters to reduce drag and to increase power" dated March 6, 2003, the entire disclosure of which is incorporated herein by reference.
[0002] This application claims the benefit of applicant's U..S. Provisional Application Number 60/500,362 titled, "Self- Actuated Horizontal Wind Shutters For a Vertical Axis Wind Turbine" dated September 3, 2003, the entire disclosure of which is incorporated herein by reference.
[0003] This application claims the benefit of applicant's U.S. Provisional Application with no number yet assigned and titled, "Gravity Powered, Fuel-Less Glider Useful in the Air, on the Surface of the Water, or as an Underwater Sea Glider" dated December 26, 2003, the entire disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0004] The above referenced U.S. Provisional Application Number 60/452,119 discloses the invention of a vertical axis wind turbine that has shutters that are actuated by hydraulic or pneumatic rams that are electronically controlled. The
vertical axis wind turbine uses drag instead of lift as a means of more efficiently harnessing the power of the wind. The wind turbine alternates from a high drag configuration to a low drag configuration by opening and closing shutters. The shutters provide substantial surface area perpendicular to the direction of the wind to catch the wind when open to create high drag and have minimal surface area perpendicular to the direction of the wind when closed to create low drag. [0005] Actuation of the shutters via hydraulic or pneumatic rams as disclosed in the above referenced patent application presents a number of problems. The direction of the wind must be electronically determined by pitot tubes or other methods. And once the direction of the wind has been determined, proximity sensors must tell the shutters to open and to close within the desired arc around the circumference of the wind turbine in order to accomplish proper operation of the wind turbine. Thus substantial effort and cost must be expended in order to electronically actuate the wind turbine in the proper location using hydraulic or pneumatic rams as disclosed in the above referenced provisional patent.
[0006] The above referenced U.S. Provisional Application Number 60/500,362 discloses a self-actuation mechanism to operate the shutters instead of the use of a hydraulic or pneumatic ram as proposed in the original previous application. The self-actuation mechanism beneficially used a counterweight to accomplish self actuation. The counter-weight worked well in actual prototypes developed by the present applicant. However, the design using an actual counterweight is not aerodynamically efficient.
[0007] The above referenced U.S. Provisional Application dated December 26, 2003, discloses a wind turbine and hyro-
turbine that employs a disk mounted to a shaft with pivot able shutters mounted to the disk. The shutters may be folded down into the disk to provide a very aerodynamic or hydro-dynamic design that substantially reduces drag the shutters move into the wind or water as they rotate with the disk and shaft. [0008] Conventional wind turbines must be directed into the wind and may not be used readily in many applications for which it would be desirable to use a wind turbine and they produce a large amount of detrimental drag due to the large swept are of the vertical blade circumference of rotation. [0009] Conventional turbines must be very tall in order to create leverage by having very long blades to sweep a very large area.
SUMMARY OF THE INVENTION
[0010] The present inventor has succeeded at designing methods and systems for producing a wind turbine, high pressure gas turbine, hydro-turbine, pneumatic motor, or hydraulic pump that has shutters that are hydraulically operated, pneumatically operated, or self-actuated.
[0011] The preferred embodiment of the present invention is an apparatus that consists of shutters that are rotatably attached to a disk that is mounted on a vertical axis, although a horizontal axis may be used if the shutters are not self-actuated. The axis is connected to a central frame, housing, or stand via bearings that allow rotation of the horizontal disk and vertical shaft. The disk provides structural integrity for the shutters and provides a mechanically efficient aerodynamic design that produces far less drag than the amount of drag produced by a conventional
horizontal axis wind turbine that uses vertical propeller type blades of which the entire circumference of the vertical blades, known as the "swept area", creates drag. An additional negative aspect of conventional wind turbines is
100 that they must be directed into the wind.
[0012] The new vertical axis wind turbine of the present invention attaches a rotating horizontal disk to a vertical axis. The axis is attached to a frame via bearings that allow the disk and shaft to rotate. Shutters are made into the disk
105 that open up near vertically to catch the wind or close by folding down horizontally into the disk to reduce drag as the shutters move into the wind.
[0013] In the preferred embodiment of the present invention, the shutters are used in pairs with an upper and
110 lower shutter placed over each other on the disk. As the two shutters open, the top shutter opens upward and the bottom shutter opens downward to form a "V" shape that is directed into the wind or water to harness kinetic energy of motion. The shutters are self-actuated and work automatically,
115 irregardless of the direction of the wind.
[0014] The force of gravity is used to open the shutters as they are directed into the wind. The lower shutter is pivoted at the back of the shutter and gravity causes it to fall downward on its pivot point to the open position. As the
120 shutter begins to open, the force of the wind catches the shutter and forcefully opens it until it reaches stops that allow the shutter to open to approximately sixty degrees upward from the horizontal plane of the disk. Then the stops prevent the shutter from opening any further. The upper
125 shutter is connected to the bottom shutter by a gear mechanism and opens in response to the opening of the bottom shutter;
and, likewise, once partially open the force of the wind makes the top shutter fully open.
[0015] Aerodynamic lift is used to close the shutters. As
130 the disk rotates over a 180 degree arc, the direction of the "V" into the wind reverses and the direction of rotation of the backside of the "V" moves forward into the wind that further increases the velocity of the wind against the backside of the "V", which causes the wind to apply a force
135 against the back of the shutters to push them closed. The upper and lower shutters are connected together by gears that cause them to close at the same time as the force of the wind exceeds the gravitational pull of the lower shutter and both shutters fully close downward into the disk to reduce drag as
140 the shutters move into the wind.
[0016] Three or more pairs of shutters are placed around the circumference of the disk so that at least one pair of shutters always form a "V" that is directed into the wind to harness the power of the wind or water. On the side of the
145 wind turbine that is opposite from the open "V, the shutters close to go into the wind with minimal drag - about the same amount of drag as is created by a discus or aileron cutting through the wind or water. Thus, the swept area of the vertical axis wind turbine is only a fraction of the swept
150 area of a conventional wind turbine, depending on the exact size and design of the shutters being approximately twenty percent of the amount of drag of a conventional wind turbine with propeller type blades.
[0017] Further the open shutters move backward in response
155 to the motion of the wind, which further reduces drag and allows control of the amount of drag applied against the "V" as the resistance may be increased or decreased by the amount
of load applied to the shaft. Of course, the amount of kinetic energy gained is also determined by the amount of
160 breaking of the wind or water, with greater breaking generating more power and less breaking of the kinetic energy source producing less power. Because the amount of breaking is controllable, the amount of drag force may, therefore, also be controlled.
165 [0018] Conventional horizontal axis wind turbines work by the principal of lift. The vertical axis wind turbine of the present invention works by the use of drag. Its efficiency comes from creating controllable maximum drag on the power generating side of the turbine with open shutters that move
170 backward with the motion of the wind and the opposite side of the turbine produces minimal drag as only a disk moves forward into the wind. Its efficiency increases with the degree of differential between high drag and low drag. The greater the surface area of the shutters on the high drag side of the wind
175 or water turbine and the lower the surface area of the disk on the low drag side, the greater the efficiency of the wind turbine or hydro-turbine
[0019] Conventional turbines must be very tall in order to create leverage by having very long blades to sweep a very
180 large area. The new vertical axis turbine of the present invention creates leverage by increasing its width instead of height. This allows the vertical turbine to be used in many applications, in which horizontal axis turbines cannot be used, such as flat building rooftops or just above the rooftop of a
185 house, as a sailboat wind turbine over a cabin area, attached to cellular telephone towers, on top of advertisement billboards, at the top of power line towers, etc without
having long blades hanging downward like a conventional horizontal axis wind turbine.
190 [0020] The shaft of the new innovative vertical axis wind turbine may be connected to an air compressor to produce high pressure compressed air that may be used as a form of energy storage and may additionally be used as ballast weight as used in the gravityplane.
195 [0021] The vertical axis wind or water turbine is far more flexible in its operation than is a conventional horizontal axis turbine: (1) the wind may be blowing from any direction and it does not have to be directed into the wind; and, (2) the amount of drag is dramatically reduced because its swept
200 area is much smaller than the swept area of a conventional wind turbine and the drag force may be controlled; and, (2) torque is gained be an increase in horizontal distance instead of an increase in vertical distance, which allows it to be used in many applications in which a conventional horizontal
205 axis wind turbine may not be used.
[0022] The wind shutters are mounted to a pivot point at the rear of the wind shutters. As the wind shutters rotate around the vertical axis, the wind shutters open to catch the force of the wind via drag when the wind is directed toward
210 the front of the wind shutters and they close to reduce drag when the wind is directed into the rear of the wind shutters, which is during the portion of their rotation that they move forward into the oncoming wind.
[0023] The vertical axis wind turbine uses four separate
215 technical aspects of design that work together to control self-actuation of the shutters: (1) aerodynamic lift; and, 2) gravity acceleration to actuate the lower shutters downward; and, (3) a counter-weight system that may comprise actual
counterweights that extend outward beyond the shutters; or, a
220 lever mechanism that causes the upper shutter to open in response to gravity pulling the lower shutter downward; or, (3) a gear mechanism that causes the upper shutter to open in response to gravity pulling the lower shutter downward; and, (3) the use of stops to prevent the shutters from actuating to
225 a position beyond the desired position.
[0024] The stops prevent the shutters from reaching an undesirable angle of attack into the wind. The stops control both the downward limit to which the shutters may rotate and control the upward limit to which the shutters may rotate on
230 the fulcrum to prevent detrimental angles of attack of the shutters into the wind from occurring in order to control the self-actuation process of the self-actuated shutters of the present invention.
[0025] The actuation process may be hydraulically operated,
235 pneumatically operated, or self-actuated. Self-actuation is the preferred embodiment of the present invention for use as a wind turbine of hydro-turbine harnessing environmental energy. However, for uses such as a high pressure gas turbine, a more powerful method of actuation, such as hydraulic or pneumatic
240 actuation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 describes a top view of the preferred 245 embodiment of the wind turbine or hydro-turbine (100) of the present invention having self-actuated wind shutters (104), mounted on a horizontal upper disk (102) that rotates on bearings (not shown) around a central vertical axis (not shown) . The wind shutters (104) mount to a pivot point (110) 250 at the rear of the wind shutters. Solar cells are placed on
the upper surfaces of the disk (102) and the upper surfaces of the wind shutters (104) . The upper disc (102) counter-rotates a lower disk (108)
[0027] Figure 2 is a side view of the preferred embodiment
255 of the vertical axis wind turbine (200) shown in Figure 1 from a top view. As the wind shutters (204) rotate around the vertical axis (206 & 220) the wind shutters (204) open to catch the force of the wind via drag when the wind is directed toward the front of the wind shutters and they close to reduce
260 drag when the wind is directed into the rear of the wind shutters (204), which is during the portion of their rotation that they move forward into the oncoming wind in order to generate useful power from the force of the wind.
[0028] Solar cells (202) are placed on the shutters (204)
265 and upper surface of the upper disk (210) . The upper disk (210) counter-rotates the lower disk (216) . A counter- rotating generator (214) is connected to the upper vertical axis (206) for the upper disk and the lower vertical axis (220) for the lower disk (216) to produce an electrical output (218) .
270 The rotational speed of the wind turbine (200) is effectively doubled by the effect of counter-rotation. The wind turbine (200) is mounted on a stand (208) .
[0029] Figure 3 is a detail of the level system (300) of the apparatus of Figures 1 & 2. The shutters (302) are
275 actuated by the lever system (308) that provides the equivalent of a counter-weight to cause the upper shutter (302) to actuate in response to the lower shutter (316) dropping due to the effect of gravity.
[0030] The lever system (302) is comprised of an upper arm
280 (304) that is rotatably connected to the upper shutter (302) . The upper arm is rotatably connected to a main lever (308)
that pivots on a central pivot point (310) . The lower portion of the main lever (308) is rotatbly connected to a lower arm
(312) that is rotatbly connected to the lower shutter (316) .
285 As the lower shutter (316) falls via gravity, the main lever
(308) pivots on the central pivot point (310) to push the upper shutter (302) upward.
[0031] Figure 4 describes a gas turbine or a hydro-turbine or in the reverse mode an air compressor or water pump
290 apparatus (400) . Rotatable shutters (406) are mounted on a disk (404) that is attached to a shaft (410), having bearings
(414) that rotatably attach the shaft (410) to the housing
(412). The bearings (414) allow the shaft (410), disk (404), and shutters (406) to rotate within the housing (412) .
295 [0032] The open shutters (406) apply a force against the working fluid and pressurize the working fluid that enters at the top of the apparatus (400) . During the rotation of the shutters (406) , they actuate to the open position, which is ninety degrees perpendicular to the surface of the disk (404) ,
300 within zone (408) . The shutters (406) may be actuated by an electric motor, hydraulic or pneumatic motor (these are not shown) using a gear mechanism (not shown) or by a mechanical mechanisum using rollers (416) that become progressive closer together to force the shutters 406) closed from the rotation
305 of the shutters (406) into the rollers (416) . The shutters have a biasing member (not shown) that is located between the shutters that acts as a spring to force the shutters open in zone (408) after the shutters pass through the gap (418).
[0033] The shutters (406) are mounted on rotatable shafts
310 (420) that rotate within bearings (422) attached to the disk
(404) . One half of a shutter (406) actuates upward and the other half of the shutter (406) actuates downward as each
shutter (406) pivots on its shaft (420) to assume the open position and then returns to the previous closed position to
315 penetrate the gap (418) in a cycle. When in the closed position, the upper half of the shutter (406) folds over the lower half of the shutter (406) during opening and closing, a "V" shape is formed by the two halves of the shutter (406) set. Once fully open, the shutter (406) with both halves aligned
320 forms a straight vertical panel.
[0034] The shutters (406) actuate to the closed position, which is folded down within the disk 404) by the rollers (416) before going through a gap (418) in a center wall of the housing (412) on the left side of the apparatus (400) . The
325 space within the gap (418) is always filled by the disk (404) to prevent the working fluid from passing through the gap
(418) . The collapsed shutters (406) pass through the gap (418) by folding down into the disk 404), then re-open to pump the working fluid in a cycle or to produce power from a working
330 fluid flow. Four shutters (406) are shown as usually three or more shutters (406) would be attached to the disk (404) to make sure a shutter (406) is always acting upon or being acted upon by the working fluid.
335 CLAIMS
What is claimed is :
1. A turbine comprising a rotatable vessel attached to 340 an axis mounted to a suitable housing or frame and at least one rotatable shutter for producing rotation from a kinetic energy source, such as from a class of environmental energy like wind power or hydro-power, or from discharging pressurized working fluid past