U.S. Pat. No. 4,960,363 describes a fluid flow engine in which the incoming fluid is passed through a venturi-shaped opening that is said to increase the velocity of flow prior to directing the fluid toward the innermost blades of the counter-rotating turbines in the channel formed between the two turbines. It has also been suggested that the efficiency of fluid energy conversion devices based upon counter-rotating motors can be increased by advantageously directing the fluid flow against the vanes of each such motor, as disclosed in U.S.
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Mechanical stops 238 are positioned adjacent the circumference of intermediate plate 225 and lower plate 229 rearward of the outermost subvane 236A of each vane 231 to prevent the innermost edge of said outermost subvane from moving beyond the circumference of said motor. Each vane 228 in said first array further comprises two or more rigid subvanes 230A, 230B, 230C, 230D, each pivotally attached at the top of its outermost vertical edge to upper plate 227 and at the bottom of said innermost edge to intermediate plate 225 such that the innermost vertical edge of each said subvane is free to pivot about said outermost edge. Such devices have generally been based upon fluid driven vaned motors caused to rotate by the force of the fluid impacting each motor vane. As the vane is rotated beyond its point of initial contact with the liquid flow toward the first point of closest adjacency 250, 252 to inner wall 80, 82, the force of the current acting upon said vane increases, reaching a maximum when the outermost subvane of vane 228, 231 is positioned generally perpendicular to the liquid flow and nearest the first point of closest adjacency 250, 252. As the first vane continues to rotate past said point of closest adjacency, liquid entering the subchamber exerts a force on both said first vane and the next adjacent following vane.
Dolor Muscular Antebrazo
Mechanical stops 210 which, in the form illustrated, are metal rods secured to plates 200, 202, are positioned adjacent the circumference of upper plate 200 and lower plate 202 rearward with respect to the direction of rotation of the outermost subvane 206A, 207A, 208A, 209A to stop the innermost edge of said outermost subvane from moving beyond the circumference line of the motor. Mechanical stops 234 are positioned adjacent the circumference of upper plate 227 and intermediate plate 225 rearward of each outermost subvane 230A of each vane to prevent the innermost edge of said outermost subvane from moving beyond the circumference of said motor.
Each subvane is sized such that the innermost vertical edge of said subvane overlaps the outermost vertical edge of the next adjacent subvane when the subvanes are moving in the direction of liquid flow. As each vane traverses the outer arc of closest adjacency to inner wall 80, 82, the inner wall 80, 82 resists the spilling of the liquid between the vanes over the edge of the vane.
Dolores Musculares Por Ansiedad
It is preferred that the distance between the topmost horizontal edge of each subvane 206A, 206B, 206C and 206D and the bottom surface of upper plate 200 and that the bottommost horizontal surface of each subvane 206A, 206B, 206C and 206D and the top surface of lower plate 202 be minimized in order to limit the amount of liquid flowing over and under said subvanes when they are in the closed position as shown in FIG. Referring to FIGS. 1, 3, and 6, the most preferred embodiment of the present invention comprises a fully submersible system for generating electricity from ocean or river currents in which each hollow side portion 20, 22 of buoyant housing 1 is configured such that (a) the outer wall 76, 78 of said side portion is generally planar in order to decrease resistance to liquid flow and to keep the orientation of outer walls 76, 78 of buoyant housing or structure 1 parallel to the direction of liquid flow, (b) inner wall 80, 82 is generally planar from the front wall 84, 86 of said side portion to the first point of closest adjacency 250, 252 to the circumference of associated hydrodynamic motor 2, 4, (c) inner wall 80, 82 is curvilinear inward from said first point of closest adjacency 250, 252 over an arc of less than 90 degrees to the terminus 254, 256 of the arc, hereinafter the “outer arc of closest adjacency”, such that the distance between said inner wall and said circumference of hydrodynamic motor 2, 4 is maintained relatively constant over the length of said inward curvilinear surface, and (d) inner wall 80, 82 extends outwardly rearward from the terminus 254, 256 of said arc of closest adjacency to the point at which said inner wall intersects outer wall 76, 78 at the back edge 88, 90 of said hollow side portion.
Curvilinear central walls 114, 116 extend inwardly from said point 266, 268 such that the distance between said curvilinear inner walls and the circumference of each associated hydrodynamic motor 2, 4 is maintained relatively constant over an arc of less than 90 degrees, hereinafter the “inner arc of closest adjacency.” At the rear terminus of said arc 270, 272 said curvilinear inner walls intersect each other and the planar rear portion 120 of central wall 70. The inner arc of closest adjacency between said inner wall and said circumference normally ranges from 45 degrees to 90 degrees of rotation of the adjacent hydrodynamic motor. The aforementioned angular displacement of about 70-75 degrees between each of the five vanes in said first array and each of the five vanes in said second array, coupled with the angular displacement of about 35-37 degrees between vanes 228 in the first array and vanes 231 in the second array in this embodiment of the invention, results in 10 percent of the total surface of the vanes in the hydrodynamic motor being within about 16 to 20 degrees of rotation of the maximum force of the liquid flow entering the motor at all times during rotation of the motor.
Dolor Muscular Piernas
The force on the first vane decreases and the force on the following adjacent vane increases as the adjacent following vane approaches its first point of closest adjacency 250, 252 with inner wall 80, 82, at which point all of the force of the current is concentrated on the adjacent following vane. Dolor en lado interno de la rodilla . U.S. Pat. Nos. 4,551,066, 4,418,888, 4,684,817, 5,266,006, and 4,134,710, all disclose fluid-driven motors utilizing vertically oriented blades rotating about the vertical axis of the motor. 1, shaft 36 of motor 2 is secured to upper and lower bearings 38, 40 and has a spur gear 42 fixedly secured thereto which, through gear box 10, produces responsive rotation of shaft 44 which, in turn, provides rotational input power to electrical generator 6. The bottom wall 46 of top portion 24 is traversed by a water-tight centrally-located bearing 38 for receiving the upper portion of central shaft 36 which extends through bearing 38 and bottom wall 46 such that said upper portion of said shaft projects into top space 47. Similarly, the top wall 48 of bottom portion 26 is traversed by a centrally-located bearing 40 for receiving the lower portion of central shaft 36 which extends through said bearing 40 and top wall 48 such that said lower portion of shaft 36 projects into bottom space 26. A similar system (not shown) is provided in motor 4. Each motor 2, 4, in chamber 28 is rotatably attached to top portion 24 and bottom portion 26 of buoyant housing 1 such that said motor is suspended in said chamber 28 in a manner that causes the liquid flow traversing chamber 28 in direction A to rotate said motor shafts 34, 36 about their respective axes.