Abstract: A remote startup system includes: a terminal; a center server configured to receive a startup request; and a vehicle having a driving device, the vehicle configured to receive a startup request, and start up the driving device, wherein at least one of the center server and the vehicle includes an information acquisition unit configured to acquire information on transmission availability state of a power transmission device that transmits power of the driving device in the vehicle to driving wheels, or information on an operation state of a rotation prevention device that prevents rotation of the driving wheels when a function of transmitting the startup request is activated or when the startup request is transmitted, and a permission determination unit configured to determine whether to permit the startup of the driving device based on the startup request, based on the information acquired by the information acquisition unit.

Abstract: A remote startup system includes a first terminal and a second terminal, a center server configured to communicate with each of the first terminal and the second terminal and receive a startup request from each of the first terminal and the second terminal, and a vehicle on which a driving device is mounted, the vehicle being configured to communicate with the center server, receive a startup request from the center server, and start up the driving device. The remote startup system is configured to prohibit startup of the driving device based on a startup request from the second terminal when the driving device is started up and being operated based on the startup request from the first terminal or when the driving device is likely to be started up based on the startup request from the first terminal.

Abstract: A method and a system for operating an electric turning machine (ETM) operatively connected to an internal combustion engine (ICE) are disclosed. The ETM operates as a motor with a first control strategy and as a generator with a second control strategy, the second control strategy being distinct from the first control strategy. The system comprises an engine control unit adapted for controlling an operation of the ETM according to the first and second control strategies. Electric and assisted start procedures are available for starting the ICE by delivering electric power from a power source to the ETM which is co-axially mounted to a crankshaft of the ICE. Assisted start includes delivering the electric power to the ETM while a recoil starter is used to rotate the crankshaft. A manual start procedure is also available. The power source is charged by the ETM when the ICE is running.

Abstract: System and method are disclosed for detecting and refreshing an aged battery in a vehicle with a start-stop system. An example vehicle includes an engine configured to operate in a start-stop mode and a power management system. The power management system is configured for determining that a charge acceptance value of a battery is below a threshold, responsively disabling the start-stop mode and displaying a message via a display, refreshing the battery and enabling the start-stop mode after refreshing the battery.

Abstract: A solenoid drive may include a ferromagnetic housing having a coil receiving chamber axially limited by opposing face side walls, a cylindrical coil arrangement having at least one electric coil, the coil arrangement being arranged in the chamber and coaxially surrounding a cylindrical coil interior space, a ferromagnetic plunger stop having a central region projecting axially in the interior space, a ferromagnetic plunger arranged at the housing opposing the plunger stop, and a ferromagnetic bypass device extending in a circumferential direction and arranged coaxially with respect to the coil arrangement and radially within the coil. The plunger may project axially into the coil interior space and may be adjustable axially bi-directionally relative to the housing between active and distal positions, which are proximal and distal, respectively, with respect to the central region. The bypass device may be spaced apart axially from the face side walls.

Abstract: A laser device includes a light source device including a semiconductor laser; and a laser cavity irradiated with light from the light source device and including a saturable absorber. A beam waist diameter r of the light that irradiates the laser cavity and an initial transmittance T0 of the saturable absorber satisfy a relationship of 7.75×T04?7.77×T03+3.13×T02+0.16×T0+0.74?r?2.62×T0+0.675.

Abstract: A hydroelectricity generating unit capturing marine current energy includes a floating hull, at least one paddle wheel assembly, at least one generator assembly, a torque transmission system, and an anti-drift mooring system. The at least one paddle wheel assembly is rotatably mounted to the floating hull and operatively coupled with the at least one generator assembly by the torque transmission system, wherein a kinetic energy of the at least one paddle wheel assembly is transferred to the at least one generator assembly by the torque transmission system to generate hydroelectricity. The torque transmission system can be a hydraulic system, a pulley system, a multiple gearbox system, or a direct driveshaft. The floating hull is tensionably coupled to a subsurface environment by the anti-drift mooring system, enabling the least one paddle wheel assembly to capture water current.

Abstract: The invention relates to a device for converting wind energy to at least mechanical energy, comprising a rotor with a number of rotor blades drivable rotatably about a rotation axis by wind and a duct disposed therearound, wherein a central axis of the duct substantially coincides with the rotation axis of the rotor, characterized by guide means disposed upstream of the rotor for guiding the wind in a substantially helical movement round the central axis during use of the device such that the wind is supplied in the substantially helical movement round the central axis to the rotor.

Abstract: An aerodynamic device is described for mounting to an outer surface of a wind turbine blade. The aerodynamic device includes a baseplate having an inner surface defining a mounting region and a sealing region at least partially surrounds the mounting region. The mounting region is bonded to the outer surface of the blade by an adhesive. A seal is provided between the sealing region of the baseplate and the outer surface of the blade. The seal at least partially surrounds the mounting region. A barrier is provided between the seal and the adhesive.

Abstract: A wind turbine blade includes a lengthwise portion that extends between a root region and a tip region of the wind turbine blade. The lengthwise portion includes a cross section in which a first region surrounds a second region. The densities of the first and second regions vary with the first density being greater than the second density. The lengthwise portion includes a surface layer that bounds the first region, forms an exterior surface, and is configured to resist environmental degradation. At least one structural element extends longitudinally through the first region and is configured to reinforce the blade during use of the wind turbine. The lengthwise portion of a wind turbine blade may be made through an additive manufacturing process by depositing a main body in a plurality of layers. Each layer may be deposited in a plane generally parallel to a longitudinal axis of the lengthwise portion.

Abstract: The present disclosure is directed to a method for reducing loads of a wind turbine. The method includes monitoring, via a turbine controller, a rotor blade of the wind turbine for faults. If a fault is detected, the method includes determining an operational status of the wind turbine. If a predetermined operational status is present at the same time the fault is present, the method also include actively yawing a nacelle of the wind turbine away from an incoming wind direction until either the fault is corrected or cleared and/or the operational status changes.

Abstract: The present disclosure is directed to a method for optimizing power production of a wind turbine. The method includes determining at least one operational constraint for the wind turbine. The method also includes operating the wind turbine with at least one operational constraint being activated. Further, the method includes varying a tip speed ratio for the wind turbine while the at least one operational constraint is activated so as to maximize a power coefficient of the wind turbine.

Abstract: A wind turbine system is described comprising a plurality of wind turbine modules, each including a rotor, mounted to a support structure including a tower. In use, each rotor has an associated rotating unbalance that defines an unbalance vector. The wind turbine system includes control means configured to coordinate the rotational speeds of the plurality of rotors to attenuate oscillations of the support structure caused by the rotating unbalance of the rotors. Also described is a method of controlling such a wind turbine system. The method comprises coordinating the rotational speeds of the plurality of rotors to attenuate oscillations of the support structure caused by the rotating unbalance of the rotors.

Abstract: A method for outputting control instructions to at least one first wind power installation or at least one first wind farm using an evaluation device or for outputting an event message relating to an operating state of the at least one first wind power installation or the at least one first wind farm using the evaluation device is provided. Data is received by the evaluation device from at least one further wind power installation or from at least one further wind farm and the control instructions or the event messages are generated by evaluating the data and are output by the evaluation device. An evaluation device and a system having the evaluation device for carrying out the method are also provided.

Abstract: The goal of the invention is to maintain a constant supply of electrical energy with use of solar and wind power. According to the invention there is a generator and a first motor mounted on the shaft of the column, where said generator is connected, through a first relay and inverter with a power grid and the generator is also connected, through rectifier with a battery pack. Rotary guides, connected with second motors are covered with a layer with photovoltaic cells.

Abstract: A reinforcement assembly for a tower of a wind turbine is disclosed as having at least one generally cylindrical tower section with an exterior wall and an interior wall defining a height and a thickness therebetween. At least one generally cylindrical tower flange is coupled to the tower section, the tower flange having at least one vertical flange portion and at least one horizontal flange portion. At least one adjustable generally cylindrical reinforcing member has, at least one vertical member portion with at least one flexible portion coupled to the exterior wall of the tower section, and at least one horizontal member portion adjustably engaged with at least one adjusting spacer. Adjustment of the adjusting spacer aligns the reinforcing member with an adjacent tower flange.

Abstract: A method for detecting damage in a bearing of a wind turbine includes collecting vibration data relating to the bearing. Another step includes storing the vibration data in a memory device. The method also includes identifying a plurality of harmonics in the vibration data that are indicative of bearing damage. Further, the method includes eliminating harmonics within a specified frequency proximity to areas of high energy content representative of normal gearbox operation. Moreover, the method includes determining at least one of increases in energy or a variance of the energy within each of the remaining harmonics and calculating a damage factor of the bearing as a function of a least one of the increases in energy or the variance of the energy within each of the remaining harmonics. Accordingly, the method includes comparing the damage factor to a predetermined damage threshold, wherein a damage factor exceeding the predetermined damage threshold may be indicative of a damaged bearing.

Abstract: A maintenance device for maintaining an offshore wind turbine, the device being suitable for pressing against and traveling along the pylon of the wind turbine. The device includes a maintenance platform including a preferably U-shaped notch so that the pylon of the wind turbine can penetrate into said notch and travel means for causing the maintenance platform to travel along the pylon of the wind turbine. The travel means comprising a plurality of motor-driven crawlers arranged under said maintenance platform so that when the pylon of the wind turbine is placed in said notch with the vertical longitudinal axis of the pylon of the wind turbine perpendicular to the work plane of said maintenance platform.

Abstract: Propulsion is achieved without expelling matter by a non-inertial subsystem to generate substantial internal Coriolis recoil forces that supply propulsion. A subsystem discretely injects mass (fluids) radially into a non-inertial system having spinning radially-oriented fins mounted on a thin disc. The mass (fluid) is input at the circumference of the spinning system by radially injecting the fluid at high velocity onto one fin at a time at the outer end thereof. The mass centrifugally slows as it travels toward the axis and leaves the system at a very low velocity near the axis of rotation. The resultant integrated non-linear Coriolis reaction or recoil is constrained to acting through the axis of rotation of the spinning vanes by keeping the rotation rate constant. The net integrated reactive force acting on the axis of rotation of the subsystem produces a propulsive force. The injected and retarded fluids are captured near the rotation axis and recirculated to the input injectors.

Abstract: The invention provides an energy recovery system comprising a first Shape Memory Alloy (SMAs) or Negative the bundle Thermal Expansion (NTE) core and adapted to convert movement of the core into energy in response to a first temperature. Various embodiments are disclosed to include cascaded core arrangements, preheating/cooling of cores and how to decrease the time of reaction for the shape memory alloy in an efficient manner.

Abstract: A variable displacement axial pump, including: a housing including first and second inlet ports and first and second outlet ports; a shaft arranged to receive rotational torque; an axis of rotation for the shaft; swash plate located in the housing; a first cylinder block located in the housing and including first and second through-bores and first and second pistons at least partly disposed in the first and second through-bores, respectively, and connected to the swash plate; and a second cylinder block located in the housing and including third and fourth through-bores and third and fourth pistons at least partly disposed in the third and fourth through-bores, respectively, and connected to the swash plate. The shaft is arranged to rotate, with respect to the swash plate, the first and second cylinder blocks about the axis of rotation.

Abstract: A double-acting pneumatic pump is disclosed herein. It comprises a main body; three partitions including a first partition dividing the main body into two chambers, and a second partition and a third partition respectively disposed at the opposite ends of the two chambers divided by the first partition; a piston rod inserted into the first partition disposed between the two chambers and having a first piston and a second piston at two ends thereof arranged in the two chambers respectively; a switching valve and an air flow valve sequentially connected to inlets of the first partition by pipelines; and a plurality of working pipes respectively connected to each of inlets and outlets of the second partition and the third partition.

Abstract: The present disclosure relates to a solenoid valve having a ventilation structure, in which a connection passage for connecting a first space that is an operating space of an armature and a second space that is a lower space of a bobbin is formed on a bottom surface of a housing. The second space of the bobbin is connected with an outer space of the housing by a communication path. Accordingly, by connecting the first space that is the operating space of the armature with an outer space of the solenoid valve, a negative pressure can be avoided in the operating space of the armature, thus preventing the performance of the armature from being deteriorated.

Abstract: It is disclosed a hermetic compressor, provided with at least one fluid expansion chamber, whose useful volume is narrowly defined between a section of one of the faces (inner or outer) of the airtight housing of the compressor and at least one wall section adjacently attached to one of the faces of the airtight housing of the compressor.

Abstract: A compressor includes a compression mechanism configured to compress refrigerant, an electromotive mechanism configured to drive the compression mechanism, a shell accommodating the compression mechanism and the electromotive mechanism, a reservoir provided inside the shell and configured to store mixed liquid including liquid refrigerant and refrigerating machine oil, and an electrode provided inside the reservoir and facing an inner surface of the shell.

Abstract: A fluid transportation device includes a valve cover, a valve body, a valve membrane and a valve chamber seat. The valve cover has two openings. The valve body includes an inlet passage and an outlet passage. The valve membrane is arranged between the valve body and the valve chamber seat, having two valve plates respectively close an inlet valve channel and an outlet valve channel of the valve chamber seat. The valve chamber seat forms a pressure chamber which is sealed and covered by an actuator. The valve cover is sleeved on the valve body and tightly fitted to the inner wall of an outer sleeve to assemble the device, in which a first gasket is disposed between the valve body and the valve membrane, and a second gasket is disposed between the valve membrane and the valve chamber, by which sealing effect is improved and backflow is prevented.

Abstract: A pump intake pressure control apparatus includes an intake conduit joining a pump to either a pressurized or unpressurized liquid source, a wide-range flow controller configured to control the flow of liquid through the intake conduit, pressure sensors for detecting the pressure of the liquid in the intake conduit upstream and downstream of the flow controller, and an electronic master controller programmed to receive input from the pressure sensors and to actuate the wide-range flow controller to maintain the pressure downstream of the wide-range flow controller at or below a predetermined desired value. In one embodiment of the invention, the wide-range flow controller is a branched portion of the intake conduit having a valve in each branch. In another embodiment of the invention, the flow controller is a gate valve having a stationary triangular blocking member projecting into the passage between the inlet and outlet ports of the valve.

Abstract: A service module for troubleshooting a pumping unit, particularly that used in the oil/gas industry, is operatively coupled between a motor of the pumping unit and a high pressure shutoff sensor which acts to kill the motor of the pumping unit in the event a pressure of the pipeline exceeds a prescribed threshold. The service module is operable in a first normal operating mode in which the shutoff sensor acts as it normally would to shut off the motor when the prescribed threshold is exceeded, and in a second troubleshooting mode where the normal operation of the shutoff sensor is bypassed for a predetermined period of time. After the predetermined period of time of the second troubleshooting mode has elapsed, the service module automatically returns to the normal operating mode. The shutoff sensor thus remains operatively coupled to the motor during troubleshooting of the motor.

Abstract: A pushrod assembly 5 may include a seal carrier 50 for a spaced seal assembly 60 and/or a seal carrier 70 for a stacked seal assembly 74, the spaced seal assembly including first and second annular seals 61, 62 separated by a spacer 63 to isolate between the seals a vented region 28 of the pushrod housing 6, the stacked seal assembly including at least two annular seals 80 stacked on the seal carrier. Each seal assembly can be removed and replaced via an access end 52, 72 of the seal carrier after detaching the access end from an adjacent component of the assembly. The seal carriers may be incorporated into a cryogenic pump 2 wherein at least one annular seal is arranged on each seal carrier to seal the pushrod assembly 5 within its housing 6.

Abstract: An external gear pump, having a driving first pump gear and a second pump gear driven by the first pump gear, which intermesh to convey a fluid from a suction side to a pressure side of the external gear pump. The first pump gear and the second pump gear each have a plurality of teeth, each having a leading tooth flank leading in the rotation direction of the corresponding pump gear and a trailing tooth flank. The leading tooth flank of the first pump gear interacts with the trailing tooth flank of the second pump gear to drive the second pump gear via the first pump gear. The trailing tooth flanks of the first pump gear extend concavely to form a fluid pocket at at least one axial position in the radial direction at least in sections in each case.

Abstract: A rotary apparatus comprises a housing, a rotor, and a face seal. The rotor is mounted for rotation relative to the housing. The housing and the rotor cooperate to provide an annular clearance passage therebetween. The face seal is positioned in communication with the clearance passage and establishes a sealed connection between the housing and the rotor to block ingress of debris from the clearance passage. The housing or the rotor comprises a knife partially defining the clearance passage to cut debris that may enter the clearance passage. The rotary apparatus may be used, for example, in a shaft assembly or a final drive.

Abstract: The pump includes a pumping chamber within a sealed internal chamber, a pump inlet connected to the pumping chamber, a pump outlet connected to the pumping chamber, and a rotational pumping element configured to pump the corrosive fluid from the pump inlet to the pump outlet. The rotational pumping element is within the pumping chamber. The pump includes a drive shaft for driving the rotational pumping element. The drive shaft is completely within the sealed internal chamber. The drive shaft is configured for magnetically coupling to an external motor. A pump housing forms the sealed internal chamber. The rotational element, the pumping chamber, and the pump housing are formed from any one a conductive plastic, a non-conducting plastic with conducting particles, a semi-conducing ceramic, and combinations thereof. The drive shaft is formed from the semi-conducting ceramic.

Abstract: A controlled variable delivery external gear machine (VD-EGM). The VD-EGM includes a housing, an inlet, a drive gear, a driven gear, the drive gear configured to engage the driven gear in an angular mesh zone, an outlet, a first slider comprising a first longitudinal portion connected to a second longitudinal portion such that longitudinal forces applied to the first and second longitudinal portions substantially cancel each other thereby requiring between about 0 N to about 20 N to longitudinally moving the first slider, selective positioning of the first slider configured to vary net operational volumes of fluid communication between the inlet and the outlet, for a given rotational speed of the drive gear, and a first drive mechanism coupled to the first slider and configured to cause the first slider to slide in a longitudinal direction.

Abstract: The present invention includes a case, a driving motor, a rotating shaft, a cylinder having a compression space formed in a central portion thereof, a roller, a main bearing and a sub bearing, and a vane for partitioning the compression space into a suction chamber and a compression chamber, wherein the vane includes a vane housing provided with a space portion and a communication hole formed through one side of a front end portion thereof to form a flow path of a compressed refrigerant, and a valve member slidably installed in the space portion of the vane housing and selectively communicating the space portion with the compression chamber, wherein the flow path of the compressed refrigerant is formed by the movement of the valve member.

Abstract: Gear pump (1) for pumping liquids, of the type comprising: a stator unit (2), which is equipped with a substantially cylindrical cavity (3) and is designed to generate a magnetic field rotating on the inside of said cavity (3); a substantially tubular, cylindrical bush (4), which is keyed on the inside of the cavity (3) of the stator unit (2); and at least one pumping gear (5, 6) housed in an axially rotatable manner on the inside of the bush (4); one or more longitudinal grooves (12) being present in the zone of contact between the stator unit (2) and the bush (4), said longitudinal grooves extending in the interstitial space between the bush (4) and the stator unit (2) and being designed to conduct an adhesive inside the interstitial space between the bush (4) and the stator unit (2).

Abstract: A Method for controlling the liquid injection of a compressor device or expander device. This compressor device includes at least one compressor element or expander element, whereby the element comprises a housing that comprises a rotor chamber in which at least one rotor is rotatably affixed by means of bearings, whereby liquid is injected into the element. The method comprises the step of providing two independent separated liquid supplies to the element, whereby one liquid supply is injected into the rotor chamber and the other liquid supply is injected at the location of the bearings. The separated liquid supplies are realised by means of a modular channelling piece of an injection module.

Abstract: Disclosed herein is a compressor with an oil return unit, The compressor includes: a main housing; a turning scroll which is turnably mounted to the housing; a fixed scroll which engages with the turning scroll and forms a compression chamber; an auxiliary housing which includes a discharge space communicating with an outlet side of the fixed scroll, and a collection space in which oil collected in the discharge space is temporarily stored; an oil return passage which is formed in the fixed scroll and communicates with the collection space; and an oil supply passage which is formed in the main housing, communicates with the oil return passage, and diverges such that oil is supplied to at least two places.

Abstract: A screw compressor includes: a screw compressor main body; a motor for driving the screw compressor main body; a gearbox interposed between the screw compressor main body and the motor to transmit a driving force of the motor to the screw compressor main body; and a gas cooler positioned below either the screw compressor main body or the motor and attached as a separate body to a side surface of the gearbox.

Abstract: A centrifugal pump includes a selectable regenerative style pumping element, including a regenerative pump rotor and at least one side wall flow channel formed by a rotating disc. The regenerative pumping element is selectable between a first state in which the disc does not rotate with the impeller and a second state in which the disc rotates with the impeller.

Abstract: A centrifugal compressor, in which a plurality of impellers that rotate along with a rotation shaft to pump fluid by using centrifugal force are disposed at a plurality of stages along an axial direction to compress, in a stepwise manner, the fluid sucked in from a suction port, the centrifugal compressor including: a closed impeller including a plurality of vanes disposed in a radial manner about the rotation shaft, and a shroud covering the plurality of vanes from radially outside; and an open impeller including a second plurality of vanes without a shroud. The closed impeller is disposed at a rearmost stage in a fluid flow direction. The open impeller is disposed at a stage located immediately after the suction port in the fluid flow direction.

Abstract: A vortex pump configured to discharge gas suctioned into the vortex pump to an engine of a vehicle, the pump including: an impeller; and a housing rotatably housing the impeller and including a discharge channel extending from an outer circumferential edge of the impeller along a direction separating away from a rotation axis of the impeller, where the impeller includes: a plurality of blades disposed in an outer circumferential portion of an end surface of the impeller along a rotation direction of the impeller; a plurality of blade grooves, each of which is disposed between adjacent blades; and an outer circumferential wall disposed at the outer circumferential edge for closing the plurality of blade grooves at an outer circumferential side of the impeller, and the housing includes an opposing groove opposing the plurality of the blade grooves and extending along the rotation direction of the impeller.

Abstract: A motor of a ceiling fan includes a support unit, a rotor unit, a first bearing, a supporting bearing and a stator unit. The support unit has a shaft. The rotor unit has a rotational connecting member. The rotational connecting member includes a central hole through which the shaft extends, as well as an inner flange extending inwardly of the central hole. The first bearing includes an inner race fit around the shaft and an outer race connected to an inner periphery of the rotational connecting member. The inner and outer races are spaced from each other in a radial direction perpendicular to the shaft. The supporting bearing includes a fixed race fit around the shaft and a rotational race abutting with the inner flange. The fixed race and the rotational race are spaced from each other in an axial direction. The stator unit is connected to the support unit.

Abstract: Disclosed embodiments relate to a combination axial fan and LED lighting system configured to fit into the footprint of a standard ceiling tile. Disclosed embodiments further include ceiling tiles with a built-in fan and/or LED lighting. The disclosed systems may include a housing container and an axial fan. The fan has a fan cavity including air diversion mechanism to direct air from the fan cavity toward the lighting and fan components. The inventions include an airflow surface to direct air existing the fan cavity along an LED light fixture. Moreover, disclosed embodiments include one or more UV light sources which irradiate contaminants as air flows through the ceiling tile.

Abstract: In an illustrative embodiment, a control system to synchronize a number of slave fans to a master fan may include a master voltage controlled oscillator to receive input voltages, rotate master blades of the master fan pursuant to the input voltages, and provide reference synchronization signals; a slave voltage controlled oscillator to receive the input voltages modified by a gain, rotate slave blades of the slave fan at slave fan speed pursuant to the input voltages, and provide slave synchronization signals; and a phase lock loop configured to receive the reference synchronization signals and the slave synchronization signals, provide a comparison between the reference slave synchronization signals, and provide the gain pursuant to the comparison between the reference synchronization signals and the slave synchronization signals.

Abstract: An intershaft seal assembly that is between a first shaft and a second shaft of a bearing compartment of an engine includes a first seal element and a retaining element. The first seal element surrounds the first shaft and includes a first portion is in contact with the first shaft and a second portion extending in a non-parallel direction to a radial direction of the first shaft. The retaining element is threadably engaged with the first shaft such that the retaining element presses the first seal element against the shoulder of the first shaft.

Abstract: An assembly is provided for interconnecting a drive shaft of a motor to an impeller of a pump. The assembly includes a stub shaft having an end with a fastener for connecting the stub shaft to an impeller and an opposite end in the form of a sleeve having an inner diameter defining a cavity. The assembly also includes a motor shaft sleeve having an end received within the cavity of the stub shaft and an opposite end in the form of a sleeve having an inner diameter defining a cavity therein for receiving, engaging and being secured to the drive shaft of the motor. The inner diameter of the sleeve of the motor shaft sleeve is smaller than the inner diameter of the sleeve of the stub shaft. A pump and a method of interconnecting a drive shaft of a motor to an impeller are also provided.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) system includes a blower assembly having a blower housing, a motor disposed at least partially within the blower housing, and a small diameter impeller having a plurality of blades disposed about the impeller. The small diameter impeller extends radially into an inlet of the blower housing and includes a peripheral flange that forms a momentum based interstitial seal that orients leakage between the blower housing and the impeller against an incoming airflow entering the at least one air inlet and reduces leakage between the blower housing and the impeller by employing a velocity pressure of the incoming airflow to overcome a static pressure within the blower housing that drives leakage.

Abstract: A low-pressure compressor for a turbine engine, such as an aircraft turbojet engine includes a rotor with two rows of rotor blades between which two annular ribs are positioned; and one annular row of stator blades between the rotor blades. An internal shroud is connected to the stator blades. The internal shroud includes abradable material collaborating with the annular ribs, and annular teeth made of an abradable material and which extend radially towards the rotor, so as to provide sealing. The system may be used in a method for manufacturing a bypass turbojet engine compressor.

Abstract: Systems for pumping water are described. The system can include a covered pool containing a first volume of water, an oared water pump with a plurality of radial oars, an upper reservoir configured in fluid communication with the covered pool, a lower reservoir and a hydroelectric system. The oared pump can pump water from the covered pool into the upper reservoir. The upper reservoir can be configured to communicate water to the lower reservoir through the hydroelectric system with the lower reservoir configured in fluid communication with the covered pool.

Abstract: Provided is a centrifugal compressor impeller that includes blades extending from an inlet to an outlet for a fluid. Each of the blades of the impeller includes, when a distribution of blade angles of a tip is viewed in a direction in which the tip extends from a tip inlet to a tip outlet for the tip, a constant blade angle region in which the blade angles are constant. A start point on the inlet side of the constant blade angle region is set at a position spaced apart from the tip inlet.