A liquid pump includes a housing, a motor fixed in the housing, and an impeller driven by the motor. The motor includes a stator and a rotor rotatable relative to the stator. The impeller is connected to a rotor of the motor. The housing includes a guide wall surrounding the stator, and a guide face extending outwardly from an outer surface of the guide wall to guide a liquid flowing to the guide wall to flow in a direction away from the stator, thus ensuring the electrical safety of the liquid pump.

A hanging windmill has a wind turbine and a generator mounted on an airframe supported by a hanger at the center of gravity of the assembly. A stop is provided for preventing the tipping of the airframe on the hanger beyond a point where the blades of the wind turbine strike the hanger.

A wind turbine for capturing energy from a fluid flow comprises a rotor having a rotational axis and a plurality of rotor blades 104 arranged for rotation about the rotational axis. The rotor blades extend longitudinally in a direction substantially parallel to the rotational axis. A shield member V3 is arranged to shield some of the rotor blades from an oncoming wind where incidence of the wind on those rotor blades would act against rotation of the rotor in the direction of rotation. The rotor blades 104 are distributed about the circumference of the rotor and are spaced from the rotational axis, defining a substantially cylindrical space within the rotor through which the wind passes. The shield member V3 is defined by a radially inward surface and a radially outward surface. The radially inward surface follows substantially a portion of the circumference of the rotor. The radially outward surface of the shield member V3 comprises a first portion which meets the radially inward surface. In the region of the interface with the radially inward surface, the first portion extends in a first direction n that makes an angle of at least 0 degrees and up to 90 degrees in the contra-rotational direction with the radial direction of the rotor. The radially outward surface of the shield member V3 comprises a second portion which meets the first portion. At least a portion of the second portion extends in a second direction p that makes an angle of more than 0 degrees in the contra-rotational direction with the first direction n. The turbine has improved power output and efficiency compared to earlier similar designs.

A serrated panel (70) for a wind turbine blade is disclosed. The panel (70) is configured to be attached to the trailing edge of a blade to form a plurality of serrations (71) at the trailing edge of the blade. The serrated panel comprises a base part (72) for attaching the panel (70) to the trailing edge of the blade. An exterior surface (78) of the base part comprises a corrugated surface in direction between longitudinal ends of the panel such that the exterior surface comprises crests (82) aligned substantially with midpoints of bases (80) of the serrations (71) and valleys (83) aligned substantially between serrations (71).

Disclosed is a method of adaptively adjusting lift and drag on an airfoil-shaped sail. The method includes: (1) mounting at least one airfoil-shaped sail body having an airfoil-shaped cross section; (2) defining a Y-shaped air jet channel in the airfoil-shaped sail body; (3) arranging a flow regulating gate in the Y-shaped air jet channel; (4) adjusting the flow regulating gate to automatically adjust the gate opening extent and the cross section opening or closing extent in response to an oncoming flow with a varying direction and speed, to regulate the airflow within the air jet channel and accordingly change the angle of attack, so that the lift and drag on the sail body can be automatically adjusted as the wind speed changes. Further disclosed are an airfoil-shaped sail implementing the above method as well as a vertical-axis wind turbine employing the airfoil-shaped sail.

An article of manufacture having a nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in a scalable table, the scalable table selected from the group of tables consisting of TABLE 1, wherein the Cartesian coordinate values of X, Y and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete airfoil shape.

The invention relates to a novel rhomboidal wind turbine blade with a dihedral angle, as a supplement to another invention filed by the same applicant in 2013, said blade originally comprising four planar rhomboidal sides and a dihedral angle, and now including a longitudinal depression in the side forming the dihedral angle, from the center of the major axis of the blade, which traps more wind with a concave shape and directs same to the vertex of the angle, compressing the wind which rebounds from the vertex of the angle and powering the rotary movement with two sets of two blades per generator, as well as including an automatic safety system allowing the position of the blades to be changed in the event of high-speed winds by a computer system between a motor and a wind speed sensor, with the blades being coupled to the rotor with an angle that can be varied in response to high-speed winds.

An article of manufacture having a nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in a scalable table, the scalable table selected from the group of tables consisting of TABLE 1, wherein the Cartesian coordinate values of X, Y and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete airfoil shape.

Disclosed is a micro wind cell and a micro wind cell array for generation of power. The micro wind cell for generating wind power may comprise a rotor, an upper support and a lower support, a spacer rod, one or more bearings, a generator mount, a power generator and a rotor pin. The rotor further comprises a plurality of rotor blades and a through hole formed at the center of the rotor. The through hole is configured to receive a rotor pin. Further, the rotor blades are configured perpendicular to the direction of wind and the rotor rotates for generation of power. The micro wind cell array comprises one or more micro wind cells for generating power utilizing flow of wind from multiple directions along a wall, and a battery pack for storing the generated power. The micro wind cell array in isosceles quadrilateral shape may enable stacking of arrays.

A wave energy converter utilizes a flotation module that rises and falls with the passage of waves, a submerged tube containing a constriction which multiplies the speed of the water passing therethrough, a turbine (or other hydrokinetic apparatus) positioned so as to extract energy from the accelerated flow of water within and/or through the tube, and a submerged gas- or liquid-filled chamber housing one or more energy conversion components (e.g. generators, transformers, rectifiers, inverters). By providing a chamber in proximity to the turbine, generators can be placed in closer proximity to the turbine that turns them, and the shared shaft can be shorter than if the generators were placed in the buoy adjacent to the surface.