Abstract: An axial flow fan having auxiliary blades which includes a hub rotatably supported and driven by a drive source, a plurality of fan blades extending radially outwardly from the hub and at least one auxiliary blade projecting from an outer part on a suction and/or pressure surface of the fan blade and extending in the chord-length direction in such a manner that the leading region of the auxiliary blade is located nearer to the central axis of the fan than the trailing region thereof. A supplementary angle .theta..sub.0 of an angle formed between a chord line connecting to a leading edge and a trailing edge of the outer auxiliary blade and a reference line decided by the shape or operation of the fan blade has the relation; 5.degree..ltoreq..theta..sub.0 .ltoreq.40.degree.. A supplementary angle .theta..sub.

Abstract: A propeller hub rotatable about an axis is provided with a plurality of airfoil surfaces peripherally arranged about the axis and defining a first pitch angle that is acute and adjustable with respect to the tangent on the circular arc described by rotation of the airfoil surface as seen in a plane perpendicular to the axis, and further by a second pitch angle being acute and adjustable and measured with respect to the axis of rotation within a plane containing the axis of rotation. Peripherally adjacent airfoil surfaces may have their first pitch angles oppositely oriented and second pitch angles oppositely oriented to respectively propel fluid inwardly and outwardly with respect to the axis of rotation. The air foil surfaces may be directly connected to the hub and extend conically outward or connected to the hub by means of arms that may be angled airfoil surfaces functioning as conventional screw propellers. The hub may be mounted coaxially adjacent a counter rotating screw.

Abstract: A centrifugal impeller for use in a combination centrifugal-turbine pump capable of pumping liquids at or near the boiling point thereof with suction heads not greater than about one foot and wherein the entrance portion of the centrifugal impeller includes a plurality of vane inserts removably mounted therein, with adjacent ones of the inserts having vanes that are aligned with each other to define liquid-feeding spiral vanes that extend through the plurality of inserts.

Abstract: Wind turbines are largely divided into vertical axis wind turbines and propeller (horizontal axis) wind turbines. The present invention discloses a vertical axis high speed wind turbine provided with a starting and braking control system. This vertical axis wind turbine is formed by having blades of a proper airfoil fitted to respective supporting arms provided radially from a vertical rotary axis by keeping the blade span-wise direction in parallel with said axis and being provided with a low speed control windmill in which the radial position of each operating piece varies with a centrifugal force produced by the rotation of said vertical rotary axis.

Abstract: For a watercraft which may be a powered craft or a sailboat with an auxiliary engine, a propeller which will pivot relative to its propeller shaft about an axis extending transversely of the propeller shaft so that the propeller retracts into general longitudinal alignment with the propeller shaft. The propeller includes two blades fixed to each other as a unit with a pivot pin passage formed at the juncture of the two blades. In one preferred form, one of the propeller blades is made larger than the other with the smaller blade positioned rearwardly in relation to the pivot pin passage and the larger blade forwardly of the passage. Furthermore, in this embodiment, the pivot pin passage extends at a relatively slight teetering angle to a plane extending perpendicular to the propeller shaft axis.

Abstract: The efficiency of a hydro-electric generator is improved by providing open-ended hollow tubes having influx ends proximate the axis and efflux ends proximate the periphery of a fan-bladed turbine. The jets of water developed by rotation of the fan-bladed turbine are directed against turbine vanes at the periphery of the fan blades. The device is particularly suitable for mounting in a water current such as in an ocean current or river.

Abstract: A wind mill construction is disclosed, including a rigid tower structure (6, 7) to the upper end of which is connected for rotation about a vertical axis a wind turbine housing (5) to which is journalled for rotation about a horizontal axis a propeller (2) of the two-blade on three-blade type, characterized in that a strip member (8) extends generally helically about the tower structure for counteracting the effects of wind upon the tower and the blades. The strip may be mounted on the upper portion of a tower the base portion of which has a frustoconical configuration. The pitch of the helical strip is preferably no greater than three times the maximum diameter of the upper tower portion.

Abstract: A centrifugal impeller for use in a combination centrifugal-turbine pump capable of pumping liquids at or near the boiling point thereof with suction heads not greater than about one foot and wherein the entrance portion of the centrifugal impeller includes one or more of vane inserts removably mounted therein, with adjacent ones of the inserts having vanes that are aligned with each other to define liquid-feeding spiral vanes that extend through the plurality of inserts.

Abstract: A propeller hub rotatable about an axis is provided with a plurality of airfoil surfaces peripherally arranged about the axis and defining a first pitch angle that is acute and adjustable with respect to the tangent on the circular arc described by rotation of the airfoil surface as seen in a plane perpendicular to the axis, and further by a second pitch angle being acute and ajustable and measured with respect to the axis of rotation within a plane containing the axis of rotation. Peripherally adjacent airfoil surfaces may have their first pitch angles oppositely oriented and second pitch angles oppositely oriented to respectively propel fluid inwardly and outwardly with respect to the axis of rotation. The air foil surfaces may be directly connected to the hub and extend conically outward or connected to the hub by means of arms that may be angled airfoil surfaces functioning as conventional screw propellers. The hub may be mounted coaxially adjacent a counter rotating screw.

Abstract: An axial flow fan includes a plurality of auxiliary blades disposed upon and projecting from the suction and/or pressure surfaces of primary fan blades radially disposed on a hub member. The auxiliary blades extend substantially in the width direction or transversely of the primary blades, and the leading edges of the auxiliary blades, as viewed in the rotational axis direction of the fan, are disposed closer to the rotational center of the hub member than the trailing edges of the auxiliary blades. In this manner, the axial flow fan produces an axial fluid flow by means of the primary blades and a radial fluid flow by means of the auxiliary blades.

Abstract: A rotor for compressors, turbines or the like and having a plurality of circumferentially-spaced blades in which every other blade is modified so that the average natural frequency of said modified blades differs from that of the other blades by at least 4% but by no more than 15% so as to reduce the maximum amplitude of turbine blade vibration.

Abstract: A centrifugal fan for circulating room air characterized by an impeller supported for unidirectional rotation about a vertical axis. The fan includes a circular array of vertically oriented, radially extended blades, each blade being at its ends to a pair of end plates and characterized by a leading surface of a substantially flute-like configuration defining a forwardly opening compression chamber extended along the length thereof and communicating with apertures extended radially into the end plates, between the ends of adjacent blades defining openings for accommodating vertical streams of air flowing between the blades.

Abstract: A high speed, high capacity impeller assembly for a double suction, double volute centrifugal pump. The impeller assembly includes an impeller and two inducers rotatably mounted on a shaft. The inducers feed influent into the eye of the impeller on either side thereof. The impeller includes a plurality of vanes having a low lead angle at the leading edge of each vane. Partial vanes are also provided between each main vane to reduce vortex motion and pump vibration.

Abstract: A pump having centrifugal and vortex impellers mounted on a common rotor member. Impellers are mounted on opposite sides of rotor and make maximum use of rotor diameter. Fluid follows a serial path through the centrifugal and vortex impellers. The vortex impellers rotate in a vortex channel divided into one or more sections, plural sections of which may be arranged in parallel flow relation. The casing surrounding the rotor member may form the necessary inlet, outlet, and internal fluid channels for the pump.