Patent Publication Number: US-2004057829-A1

Title: High efficiency vertical axis windmill

Description:
PRIOR ART  
       [0001] In my previous patent applications “All weather windmills” and “All weather turbines” I have discussed a safety mechanism to withstand heavy storms and continuous stable PRM&#39;s through unstable weather patterns and building larger windmills which was not possible by the old technology however efficiency enhancement has been a challenge throughout this time till this day and now the art of enhanced efficiency has been disclosed by this present invention.  
                               U.S. Patent Documents                                             274541   February 1883   Zwiebel.       1413411   April 1922   Lloyd et al.       1766765   June 1930   Savonius.       2007963   July 1935   Cleveland.       4005947   February 1977   Norton et al.       4037983   July 1977   Poeta.       4039849   August 1977   Mater et al.       4288200   September 1981   O&#39;Hare.       4359311   November 1982   Benesh.       4362470   December 1982   Locastro et al.       4474529   October 1984   Kinsey.       4715776   December 1987   Benesh.       4784568   November 1988   Benesh.       4830570   May 1989   Benesh.       4838757   June 1989   Benesh.                  
 
       [0002]                               Foreign Patent Documents                                            37015   January 1927   DK.       65940   December 1924   FI.       658943   June 1929   FR.       727519   June 1932   FR.       797106   October 1935   FR.       0961999   May 1950   FR       2286955   April 1976   FR.       2468003   April 1981   FR.       2522074   August 1983   FR.       821930   November 1951   DE.       1628140   February 1970   DE.       1916460   October 1970   DE.       60-145464   July 1985   JP.       270858   March 1926   GB.       1518151   July 1978   GB.       WO81/03683   December 1981   WO.                    
       OTHER REFERENCES  
       [0003] Augmentation of Power in Slow-Running Vertical-Axis Wind Rotors Using Multiple Vanes, Sivasegaram et al., Wind Engineering, vol. 7, No. 1. 1983. pp. 12-19. Design of a Prototype Improved Savonius Rotor: “As A System Totality”, Rao, pp. 967-973 (no date).  
       [0004] Article entitiled “Vertical Axis Wind Rotors-Status and Potential”. from Wind Energy Conservation, pp. 28-29 (no date, but published prior to date of application).  
       [0005] “The Savonius Super Rotor!” by Michael Hackleman reprinted from the Mother Earth News, No.  193  (no date, but published prior to date of application).  
       [0006] Mechanical Engineering, Vo. 53. May 1931. No. 5. “The S-Rotor and Its Applications” by Savonius.  
       [0007] The Wind Power Book by Jack Park. 1981. pp. 93-95.  
       [0008] Newsletter 1. A Supplement to Wind and Wind Spinners. Jul. 1975. pp. 1-26.  
       [0009] “Wind Tunnel Performance Data for Two-and Three-Bucket Savonius Rotors”, Report No. SAND  76 - 0131 . July, 1977 authored by Blackwell et al.  
       [0010] Paper Presented at the Second International Symposium on Wind Energy Systems, held in Amsterdam, Netherlands, Oct. 3rd-6th, 1978. vol. 2. pp. F3-30 to F3-34.  
       SUMMARY OF INVENTION  
       [0011] In this art the sail/wing or blade is perforated with vents (openings) based on the size of the vertical axis rotor blade and blinds are placed inside the blade in such a way that the wind coming from the vents open the blinds by its force and pass through it with least possible resistance and when this rotor blade comes into position facing the wind directly when the vents are behind the blinds, the wind close the blinds against the vents and the total blade becomes a large cavity with no vents at all. This principle drives the wind to put maximum pressure and a passage is provided to force the wind to move the rotor blade and pass through the space between the two inner edges of the rotor blades. In this process the opposing blade is made open to pass the wind directly through its open vents reducing the drag to its minimum translating into an increased efficiency.  
     
    
    
     BRIEF DESCRIPTION OF DRAWINGS  
     [0012]FIG. 1 is the diagrammatic side views of this preferred embodiment wherein the wind is coming through the air vents.  
     [0013]FIG. 2 is the diagrammatic side view of this preferred embodiment wherein the wind is coming directly towards the blinds and the vents are in closed position.  
     [0014]FIG. 3 is the diagrammatic front view of the rotor assembly showing both wings one open and the second in close position.  
     [0015]FIG. 4 is the diagrammatic View from top showing grind direction and blinds open and close position  
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
     [0016] In this preferred embodiment the rotor blade is perforated with vents (openings) based on the size of the vertical axis rotor blade and blinds are placed inside the blade in such a way that the wind coming from the vents open the blinds by its force and pass through it with least possible resistance and when this rotor blade comes into position facing the wind directly when the vents are behind the blinds the wind close the blinds against the vents and the total blade becomes a large cavity with no vents at all. This principle drives the wind to put maximum pressure and a passage is provided to force the wind to move the rotor blade and pass through the space between the two inner edges of the rotor blades. In this process the opposing blade is made open to pass the wind directly through its open vents reducing the drag to its minimum translating into an increased efficiency. The safety mechanism balanced by centrifugal force and spring force is also placed as described in my previous patent applications named “All weather windmills” and “All weather wind turbines” makes it possible to rum it constantly without the need for a gear system in all kinds of windy conditions. The Preferred embodiment improves the efficiency by reducing the drag caused by the forward rotor blade moving against the wind.