Abstract: A pump includes a shaft that is rotatable about a central axis. An inducer is mounted on the shaft and has an inducer blade and inducer shroud attached at an outer end of the inducer blade. An impeller is mounted on the shaft downstream of the inducer and has an impeller blade and an impeller shroud attached at an outer end of the impeller blade. There is an axially-elongated annular seal element disposed at an axial end of the inducer shroud that provides sealing between the inducer shroud and the impeller shroud.

Abstract: An apparatus and method regarding an airfoil for a turbine engine, the airfoil comprising an outer wall defining an interior bound by a pressure side and a suction side extending axially between a leading edge and a trailing edge defining a chord-wise direction and extending radially between a root and a tip defining a span-wise direction. The airfoil further comprising at least one cooling passage extending radially within the interior and defining a primary cooling airflow; and at least one cooling hole having an inlet defining a first cross-sectional area, the inlet in communication with the cooling passage, an outlet defining a second cross-sectional area greater than the first cross-sectional area; wherein the primary cooling airflow enters the inlet in a first direction and exits the outlet in a second direction different than the first direction.

Abstract: A seal assembly includes an annular seal support, and an annular seal housing operably connected to the seal support. The seal housing includes a first axial surface facing away from the seal support, and a second axial surface opposite the first axial surface. A seal is located at the first axial surface. One or more first springs extend between the seal support and the second axial surface to urge the seal housing away from the seal support, and one or more second springs are located at the first axial surface to urge the seal housing toward the seal support.

Abstract: A diagonal fan having an electric motor and a diagonal impeller which can be driven about an axis of rotation (RA) by means of the electric motor. The diagonal impeller determines an air inlet and an air outlet and has a hub and impeller vanes which are distributed in the circumferential direction, extend radially outwards from the hub and are surrounded radially externally by a slinger ring. A flow angle ?D formed by the slinger ring relative to the axis of rotation (RA) increases from the air inlet to the air outlet, and a flow angle ?N formed by the hub relative to the axis of rotation (RA) decreases from the air inlet to the air outlet.

Abstract: The invention relates to a housing, wherein the housing has a cover disk having a cylindrical wall and a central receptacle with a hub for supporting a fan having a diagonal fan wheel, wherein a plurality of three-dimensionally curved air guide vanes (S) are arranged about the hub, characterized in that the air guide vanes (S) are materially connected to the cylindrical wall and as a result, the housing is produced in one working step.

Abstract: The helicoid in a tube is an energy conversion device. The helicoid in a tube converts energy in a manner selected from the group consisting of: a) converting the inertia of the mass of the flow of a fluid through the helicoid in a tube into rotational energy; b) converting a rotational energy into a change in the inertia of the mass of the flow of the fluid through the helicoid in a tube; and, c) converting the inertia of the mass of the flow of a fluid through the helicoid in a tube into fluid turbulence, cavitation, and heat in the form of friction. The helicoid in a tube incorporates a turbine stator and a turbine rotor. The turbine rotor installs in the turbine stator.

Abstract: A double suction impeller is disclosed. In at least one embodiment, the impeller is configured for centrifugal pumps and hydraulic power recovery turbines. The impeller's flow-path arrangement comprises inter-blade channels, intersecting each other at the impeller's outer diameter and defining a variable cross section shape, so that the equivalent number of blades is at least doubled with respect to a conventional configuration obtained by the coupling of two single suction impellers and an improved control over the velocity of the flow within the inter-blade channels is achieved.

Abstract: The present invention relates to conductor connection system for a wind turbine lightning protection system adapted to protect a wind turbine blade from lightning strikes. The lightning protection system comprises a down conductor cable adapted to extend in a longitudinal direction of the wind turbine blade and arranged for connection to the root end of the wind turbine blade, and comprises a number of lightning receptors electrically connected to and distributed along the length of the down conductor cable. The down conductor connection system comprises a modular down conductor cable having a first and second down conductor cable part, and at least one down conductor connector arranged between and connected to the ends of the down conductor cable parts. The down conductor connector comprises first and second terminals, connected to an end of each down conductor part, respectively, where the first and second terminals are adapted for mutual connection.

Abstract: A double suction fan includes first and second rings spaced at a predetermined distance apart from and in parallel to each other, an intermediate plate disposed between the first and second rings and including a shaft hole, a plurality of first blades disposed between the first ring and the intermediate plate, a plurality of second blades disposed between the second ring and the intermediate plate, and first and second rotating hubs disposed on both side surfaces of the intermediate plate, wherein each of the first and second rotating hubs is formed of a plurality of hub plates which are disposed perpendicular to the intermediate plate around the shaft hole, and wherein the plurality of hub plates are formed to evenly distribute air introduced through the first and second rings in a longitudinal direction of the plurality of first and second blades when the intermediate plate rotates.

Abstract: A process for optimizing the design of a semi-open centrifugal pump impeller involves the steps of, reducing the number of long blades and adding a medium length splitter blade and a short length splitter blade having varying circumferential distances between any two optimized long blades. Each medium length and short length splitter blade have the same outlet position, profile and thickness as the optimized long blade; however, the medium length and short length splitter blades have different inlet positions relative to the optimized long blade. The long blade, medium length splitter blade and short length splitter blade are arranged in circumferential sequence along the direction of rotation of the impeller. This optimization improves various problems arising from the original semi-open centrifugal pumps, including low efficiency, significant loss at the inlet, inlet cavitation, separation of boundary layers at the blade inlets, narrow lift range of the dead point and excessive noise.

Abstract: A fluid pressurizing structure and fan using same are disclosed. The fluid pressurizing structure includes a hub having a plate portion located therearound. The plate portion has a first and a second surface provided with a plurality of first and second hollow protrusions, respectively. Each of the first hollow protrusions has a first fluid inlet and a first fluid outlet, and each of the second hollow protrusions has a second fluid inlet and a second fluid outlet. The first and second fluid outlets extend through the plate portion to communicate the first and second fluid inlets with the second and first surface, respectively. When the fan rotates, fluid drawn thereinto sequentially flows through the first fluid inlets and outlets and the second fluid inlets and outlets in a helical movement in cycles, and is therefore continuously pressurized, which facilitates reduced fan vibration and noise and fan motor power consumption.

Abstract: A rotating thrust-producing apparatus having a control system includes a rotatable foil having opposite first and second faces and a plurality of spaced apart fins occupying a periphery thereof. A pressure control assembly includes a first adjustable control surface disposed adjacent to a first face of the foil so as to be selectively movable over the fins of the foil. The pressure control assembly may include a second control surface disposed adjacent to the second face of the foil and which may be adjustable. As the foil is rotated, and the at least one adjustable control surface is moved over fins of the foil, a fluid pressure imbalance is created, causing a thrust in the direction of the pressure deficit.

Abstract: A silencer assembly especially designed for attachment to the exhaust port of vacuum pumps and which adapts to the pumps pressure changes to regulate the outlet flow. The silencer features a perforated housing having an inner channel which connects to the discharge port of the vacuum pump and a valve assembly having a spring-loaded ball for dynamically regulating the fluid flow through the perforated housing. Once the pressure of the flow from the pump is high enough to compress a spring by pushing on a rubber ball which acts as a valve, a channel opens inside the silencer and the air can be vented through the radially distributed perforations on the housing. As the air escapes, the noise caused by the flow is reduced.

Abstract: The present invention describes a wind turbine comprising a hub, at least one blade and at least one pitch bearing to connect the at least one blade to the hub, the at least one pitch bearing comprising at least an inner ring and an outer ring, and at least a rolling race, wherein the wind turbine further comprises at least a tensioning system configured to exert a radial compression force to at least a part of the outer ring of the at least one pitch bearing, thus increasing the resultant stiffness of the at least one pitch bearing.

Abstract: An impeller for centrifugal pump comprising: a disc, a succession of vanes which extend from the disc around the rotation axis, a central body, adapted for connection to a rotating shaft, the vanes having a profile with a double curvature: a first curvature with respect to a sectional plane that is parallel to the disc, a second curvature with respect to a sectional plane that is perpendicular to the plane of the disc, each one of the vanes comprising an inside curve and an outside curve with different curvatures: the inside curve having an angle of curvature chosen between zero and one quarter of a round angle, and/or the outside curve has an angle of curvature chosen between zero and one quarter of a round angle.

Abstract: A system for modulating air flow in a gas turbine engine is provided. The system may include a seal wall comprising an opening, a seal door configured to slideably engage the seal wall, and an actuator configured to move the seal door over the opening. In various embodiments, the system may include a surface forward of the seal door. The seal door may be configured to seal a passage through the surface and the opening of the seal wall. A track may be disposed under the seal door. The track may comprise cobalt. Rollers may be coupled to the seal door with the rollers on the track. The seal door may comprise a nickel-chromium alloy. A sync ring may be coupled to the seal door. The actuator may be coupled through the sync ring to the seal door.

Abstract: A blower assembly for a heating, ventilation, and/or air conditioning (HVAC) system includes a centrifugal fan having a fan wheel. A plurality of blades are coupled to the fan wheel at an inner blade boundary and extend radially to an outer blade boundary. The blower assembly includes a first housing panel and a second housing panel disposed on opposite sides of the centrifugal fan and extending transverse to the centrifugal fan. The blower assembly includes a wall extending between the first housing panel and the second housing panel and a flange extending from the wall at a vertex. The flange extends outwardly from the wall. A first radial distance from the vertex to the outer blade boundary is between 4 percent and 20 percent of a second radial distance from a rotational axis of the centrifugal fan to the outer blade boundary.

Abstract: A noise reduction method of a ventilator, comprising the following steps: S1 starting a ventilator and imputing a required wind pressure d at a man-machine interface, and then sending a signal to an actuator through a processor, and adjusting a first blade automatically to a maximum adjustable angle state a?° through the actuator and a second blade to a minimum adjustable angle state b°; S2 regulating a revolution speed, when a wind pressure is d, feeding back a revolution speed c, a conducting noise e1 and a radiated noise f1 to the processor through an acquisition device, and after the processor receives a revolution speed information, sending a command to lock the revolution speed to the actuator through the processor. The present disclosure can effectively solve the poor noise reduction function of the present noise reduction hoop, and can effectively reduce the cost and simplify the installation process.

Abstract: A counter rotating axial air moving device structure is disclosed. The rear rotor includes a rear hub and rear blades, and a pitch angle of each of the rear blades increases gradually in a direction away from the rear hub. The front rotor, the rear rotor and the stator component are stacked with each other. The ratio of the thickness to the diameter is equal to or greater than about 0.25 and equal to or less than about 0.8. Therefore, a better performance curve is obtained, and the vibration and noise are avoided.

Abstract: An airfoil includes pressure and suction sides that extend between a leading edge and a trailing edge. The airfoil has a camber line along an airfoil section that is equidistant between the exterior surface of the pressure and suction sides. The camber line extends from a 0% camber position at the leading edge to a 100% camber position at the trailing edge. A ratio of a maximum thickness to an axial chord length is between 0.2 and 0.5. The maximum thickness is located along the camber line between about 13% and 38% camber position.