Abstract: An in-line motor and pump assembly is supported at the bottom of a fuel storage tank by a pipe and an internal concentric conduit for housing electrical conductors extending therewithin to the motor. An impeller, coaxial with the rotor of the motor, draws the fuel into an annular passageway surrounding the stator of the motor. Further passageways convey the fuel to an annular passageway defined between the pipe and the conduit for discharge external of the storage tank. A low pressure environment attendant the inflow of the fuel is used to channel fuel for lubrication and cooling purposes to a lower journal bearing and thrust bearing supporting a common shaft for the impeller and the motor. A high pressure environment attendant outflow of fuel is used to channel fuel for lubrication and cooling purposes to a journal bearing supporting the upper end of the shaft.

Abstract: A compressor 13, for example for a gas turbine engine (10, FIG. 1), comprises a circumferentially extending static casing component 20 defining a generally axially extending main gas flow path 24. The compressor also includes a rotating aerofoil arrangement 26 comprising an aerofoil support 30 and a plurality of aerofoils 28 extending radially from the aerofoil support 30 into the main gas flow path 24. The aerofoil support 30 and the circumferentially extending static casing component 20 define a circumferentially extending generally radial passage 40 having an outlet 42 in communication with the main gas flow path 24 through which leakage air may flow into the main gas flow path 24, and the static casing component 20 includes a continuous circumferentially extending projection formation 44 projecting into the radial passage 40 to control the flow of leakage air into the main gas flow path 24.

Abstract: A high efficiency, low-noise fan ring for use with a heat exchanger having an annular fan ring body attached to a coaxial mounting ring. The fan ring body extends in a substantially perpendicular direction from an inner periphery of the mounting ring. The annular body has a circumferential periphery profile defined by a plane coincident the center axis and an inner surface of the fan ring body. The periphery profile includes a transition portion and a curved portion. The transition portion extends in a substantially perpendicular direction from the mounting ring and attaches to an end of the curved portion. In order to reduce noise and increase uniformity of airflow, the length of the curved portion of the periphery profile is sufficient long to reduce recirculation of air entering the fan ring body.

Abstract: A cooling fan for an engine in a vehicle. Ordinarily, a fan rotates within a shroud, which surrounds the fan. Leakage can occur between the tips of the fan blades and the shroud, wherein fan exhaust moves forward, and then passes through the fan again. The invention reduces leakage by placing a surface downstream of the fan. The surface employs the Coanda Effect, to urge fan exhaust to continue in the downstream direction, and not move forward as leakage air.

Abstract: A liquid pump (100) includes a top cover (40), a back plate (50), and a spacing member (60). The spacing member is sandwiched between the top cover and the back plate, thereby dividing an interior of the liquid pump into a fluid chamber (14) and a receiving cavity (16) isolated and hermetical from the fluid chamber. The fluid chamber is disposed between the top cover and the spacing member for receiving therein a fluid dynamic bearing (70) and a rotor (20) which drives working fluid to enter and leave the liquid pump. The receiving cavity is disposed between the spacing member and the back plate for receiving therein a stator (30) which drives the rotor to rotate in respective to the bearing.

Abstract: A blade is disclosed. The blade includes a metallic base comprising an airfoil, a section of the airfoil comprising a recess within a surface of the airfoil, and a composite inlay disposed within and bonded to the recess.

Abstract: Turbine system including a turbine and a tubular arrangement having an exit opening. The tubular arrangement is arranged on a downstream side of the turbine. At least one flow controlling device at least partially prevents a fluid flow through the tubular arrangement from becoming detached from the tubular arrangement. The at least one flow controlling device is positioned within the fluid flow and in an area of the exit opening. The turbine system is configured to operate efficiently in an environment wherein at least an upper edge of the exit opening is arranged above a downstream liquid level.

Abstract: The present invention relates to an inline fan housing assembly adaptable for connection with conduits of various diameters. The inline fan housing assembly comprises a connector collar for connection to the inlet or exhaust ports of the fan housings to adapt the fan housings for connection to a variety of conduits having diameters not designed to connect with the inlet or exhaust ports of the fan housing. The inline fan housing assembly also comprises an inner inlet ring for adapting the inlet port of the inline fan housing to direct air into motorized impellor of various sizes mounted within the inline fan housing. The connector collars of the present invention contain one or more steps, each step suitable for connection with a conduit of a different diameter. In one exemplary embodiment, the inner steps of the connection collar are removable thereby allow for increased air flow through the connection.

Abstract: An axial-flow fan unit that produces less noise is provided. Blades 19 are exposed from a venturi 29. The shape of each of the blades 19 is so defined that a space formed between at least an inner surface 28a of each of web leg sections 28A to 28C and an edge 19a of each of the blades 19 located in the radially outward direction of the blades 19 expands toward the ends of the web leg sections 28A to 28C (or web bodies 30A to 30C). With this arrangement, noise produced when the blades 19 rotate along the web leg sections 28A to 28C is reduced.

Abstract: A drying fan, including for water damage restoration, including for drying a room corner extending axially along an interface between a wall and a floor, has a shrouded housing having an axial flow path therethrough, an intake cowling receiving intake air, and an exhaust cowling discharging exhaust air and having a tapered ramp both a) expanding the airflow and b) directing the airflow where desired.

Abstract: A blower includes: an impeller on which there are arranged axial flow blades 40 mounted at circumferential intervals to an outer peripheral surface of a boss; a case surrounding the impeller; and a bell mouth cylindrically constricted to guide gas into the case, wherein an inner diameter of the bell mouth is smaller than an outer diameter of the impeller. Further, each blade has, in the radial direction, a sweepforward wing portion situated on the boss side and exhibiting a positive advance ratio value, and a sweepback wing portion situated on the outer peripheral side of the blade and exhibiting a negative advance ratio value, with the arc length of each blade increasing from the boss side toward the outer peripheral side. Therefore, it is possible to achieve an improvement in ventilation efficiently, through an increase in static pressure and to achieve a reduction in noise.

Abstract: Turbine system including a turbine and a tubular arrangement having an exit opening. The tubular arrangement is arranged on a downstream side of the turbine. At least one flow controlling device at least partially prevents a fluid flow through the tubular arrangement from becoming detached from the tubular arrangement. The at least one flow controlling device is positioned within the fluid flow and in an area of the exit opening. The turbine system is configured to operate efficiently in an environment wherein at least an upper edge of the exit opening is arranged above a downstream liquid level.

Abstract: Twisted blades for outdoor air conditioner condensers and heat pumps that improve airflow efficiency to minimize operating power requirements. The blades can run at approximately 850 rpm to produce approximately 1930 cfm of air flow using approximately 110 Watts of power from an 8-pole motor with an improved diffuser assembly. Using an OEM 6-pole ? hp motor produced approximately 2610 cfm with approximately 145 Watts of power while running the blades at approximately 1100 rpm. Power savings were approximately 24% (40 to 50 Watts) over the conventional configuration with increased air flow. Embodiments of two, three, four and five blades can be equally spaced apart from one another about hubs. Additionally, a novel noise reduction configuration can include asymmetrically mounted blades such as five blades asymmetrically mounted about the hub.

Abstract: A fan with central intake comprises a fan frame, a fan wheel and a fan motor. The fan frame provides a hub seat with an annular spacing for fluid flowing through and a joining part at the center of the hub seat for supporting the bearings. The fan wheel is received in the fan frame and provides a hub with an open side and a hollow side with a circular opening. The annular spacing associated with the circular opening constitutes a central flow route for admitting fluid to pass through such that heat from the central area of a radiator under the fan can be dissipated efficiently.

Abstract: A fan frame (10) for encircling an impeller (20) of a fan unit is disclosed. The fan frame includes a base (11) and a plurality of sidewalls (12) extending from the base. The base defines a hole (13) in a center so that an airflow passage is formed between the impeller and the sidewalls. The sidewalls extend upwardly from side edges of the base for encircling the impeller. Each of the sidewalls is bent inwardly to form a bent portion (121) with a groove (14) formed between the bent portion and an adjacent sidewall for providing extra access to airflow through the passage.

Abstract: A process for manufacturing stators of vacuum pumps, and stators obtained thereby, wherein a plurality of stator discs or rings are formed, preferably by pressing, and then stator discs or rings are coaxially stacked and mutually rotated so as to form a stator surface having defined thereon at least one groove extending in substantially axial direction with respect to a body of the stator.

Abstract: A wind power system (1) for generating power is proposed, comprising a rotor which is axially flowed through, is rotatably held on a shaft (2) and is provided with blades (3), as well as a guide device (5) which accelerates the air flow through the rotor (4). In order to provide advantageous conditions for generating power it is proposed that the guide device (5) consists of several flow conduits (6) tapering in the direction of flow, which conduits are arranged on the rotor (4) in a distributed way in the manner of a rim around the shaft (2), that the blades (3) are associated with one flow conduit (6) each and that the rotor (4) comprises an outside jacket (7) enclosing the same.

Abstract: An axial flow fan of high efficiency and low noise level is provided. The fan includes a motor, an impeller having a plurality of blades around a hub fitted to the motor, and a fan casing having an air inlet on one side and an air outlet on the other, wherein a radial position with a maximum setting angle in a blade section, and a radial position with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction are located between 60% and 80% of the outside diameter of the impeller.

Abstract: A device for controlling a fluid flow is disclosed. The device includes at least two fluid flow drivers, a plenum disposed to receive a fluid flow from the at least two drivers, and a baffle disposed within the plenum. The plenum has a first cross-sectional area proximate the at least two drivers and a second cross-section area at a distance from the at least two drivers, the second cross-sectional area being an exit for the fluid flow. The baffle has a first edge restrained proximate the first cross-sectional area and a second opposing edge freely disposed proximate the second cross-sectional area. The baffle has a surface area responsive to the fluid flow within the plenum to reduce a backflow if one of the at least two drivers is operational and another is non-operational.

Abstract: Novel twisted blades with an air foil for use with air conditioner condensers and heat pumps that provide improved airflow efficiency to minimize operating power requirements having an overall diameter across the blades being approximately 19 inches, and approximately 27.6 inches. The blades (AC-A) can run at approximately 840 rpm to produce approximately 2200 cfm of air flow using approximately 110 Watts of power from an 8-pole motor. Using an OEM 6-pole ? hp motor produced approximately 2800 cfm with approximately 144 Watts of power while running the blades at approximately 1100 rpm. Power savings were 25% (50 W) over the conventional configuration. A second version of the fan (AC-B) with some refinements to the flow geometry produced a similar air flow while using only 131 W of power at 1100 rpm. Power savings were 32% (62 W) over the conventional configuration. Embodiments can include two, three, four and five blades equally spaced apart from one another about hubs.

Abstract: A heat-dissipating fan includes a casing having an air outlet, a base mounted in the air outlet, an impeller being mounted on the base and having a plurality of blades, a plurality of ribs each extending between the base and the casing along a radial direction of the base, and at least one guiding ring fixedly mounted to the ribs. The guiding ring has an axial length that is longer than a width of the guiding ring in the radial direction. The guiding ring guides and divides airflow passing through the air outlet when the impeller is turning.

Abstract: A gas turbine with a compressor area has a rotor shaft 2 to carry rotor blades 1 and a casing 4 to carry stator vanes 3, with the related rotor blades 1 and stator vanes 3 forming an axial clearance space 5 between one another, wherein, in the area of the axial clearance space 5, at least one wall of the rotor shaft 2 and/or of the casing 4 is provided with an arrangement of fins 6 which are inclined against the axial direction.

Abstract: An axial-flow turbine has an exhaust diffuser including a hub-side tube and a tip-side tube. In the exhaust diffuser, front struts and rear struts are placed to cross a flow of working fluid. A wake generated behind the front strut diverts from the rear strut and passes through a gap between a pair of the rear struts. Otherwise, a wake generated behind the front strut hits against the front face of the rear strut. The front struts are equal to or multiple of the rear struts in number.

Abstract: A stator and diffuser assembly is introduced between an engine cooling fan and engine. The stator acts increase the static efficiency per unit airflow of the axial fan by reducing the rotational component of air traveling through the fan and by directing the airflow in an axial direction towards the engine. The diffuser acts to increase the static efficiency per unit airflow of the axial fan used by decelerating the airflow, thereby providing more airflow to the engine at a given fan rotational speed. The stator and diffuser assembly thus decreases the amount of horsepower necessary to drive the fan at a given rotational speed and reduces noise.

Abstract: The invention relates to a blower, especially for a personal computer. The air of the invention is to reduce the noise produces by such a blower.

Abstract: The present invention relates to an axial flow rotary machine and to a maintainable compressor bleed system therefore. The axial flow rotary machine comprises a primary flow path for a working medium, a secondary flow path for the working medium, a bleed system for allowing a bleed portion of the working medium flowing in the primary flow path to be delivered to the secondary flow path, a support structure for the bleed system located radially inboard of the bleed system, and the panels for gaining access to the bleed system. The panels are located radially outboard of the bleed system. The panels form the inner flow wall for the primary flow path.

Abstract: Small winglets placed at the outer end of each fan blade substantially reduce the vortices created in conventional fans by the pressure differential between the low pressure and high pressure sides of the blade. The winglet acts as a barrier, which substantially blocks leakage around the blade tip, thus suppressing vortices. Technical advantages include noise reduction, because there are no shedding vortices to create noise as the blades pass the struts; increased aerodynamic efficiency of the fan, providing higher air flow for the same fan speed, size, and power, because less energy is lost in vortices; and minimal cost impacts, because housings currently used for fans can still be used with standard finger guards and because winglets and blades can be formed integrally of injection molded plastic.

Abstract: The invention relates to a pump (1) having a pump guide tube (13) for the transport of a heat-exchange medium (6) for a reactor having a bundle of catalyst tubes (2), where the pump (1) has a casing (14) which surrounds the pump guide tube (13), having an aperture (15) in the lower part of the casing (14) via which the heat-exchange medium (6) discharged from the lower region of the reactor by means of the pump (1) flows into the casing (14), flows upward in the region between the inner wall of the casing (14) and the outer wall of the pump guide tube (13), if desired via a heat exchanger (18), flows into the interior of the pump guide tube (13) via an aperture (16) in the upper region of the pump guide tube (13), flows through the pump guide tube (13) from top to bottom and flows via an aperture (17) in the lower region of the pump guide tube (13) into the reactor, into the upper region of the interspace between the catalyst tubes (2).

Abstract: In an axial flow hydraulic machine, a plural number of grooves 5 are formed on an inner surface of a casing, directed into a pressure gradient direction, for connecting between an inlet side of an impeller 1 and an inside of blade residing region on the casing inner surface. With movement of movable members 6 provided on the casing inner surface, the grooves appear within the blade residing region in an unstable operation region, while the grooves cause no interference with the blades of the impeller in a stable operation region.

Abstract: A cover is provided to conceal the forward-facing step defined by the protrusion of the first stage diaphragm into the LP inlet. The cover presents a smoothly contoured surface to the flowing fluid in both radial and circumferential directions and thus reduces energy loss of the working fluid, thereby to increase performance of the LP turbine.

Abstract: A liquid pressing device includes mainly a power device consisting of a motor with a spindle, an upper cap on the motor and a lower cap under the motor, a shell for containing the power device, a helical device fitted around the spindle of the motor and having a conical body and a plurality of helical leaves around the conical body. The helical leaves spiral down to form a helical groove between every two helical leaves for water to pass through. The helical leaves have thickness gradually becoming thinner and thinner downward, and the helical grooves gradually become narrower and narrower downward to add pressure to water flowing up therein. Then the conical member functions to add second pressure to water passing through, sending it to a very high location. Then the liquid pressing device can function as a water pump or a propeller.

Abstract: A rotation device including first and second passages and a rotor shaft with a rotor which connects onto the first passage with a third passage which branches into rotor channels from the third to a fourth passage. The end zones of the third and fourth passages extend axially. The rotation device has a stator including a first central body with an outer surface which co-bounds a passage space with stator blades which have on one end zone forming a fifth passage a direction differing from the axial direction and on another end zone forming a sixth passage a direction differing little from the axial direction. The fifth passage connects onto the fourth passage and the sixth passage connects onto the second passage. The stator includes a second central body where between the sixth passage and the second passage extend manifold channels bounded by the second central body and the housing.

Abstract: A turbo-generator comprising a shaft, on which is positioned an axial ventilator, a cover that divides an inflow chamber for a cooling gas transported by the axial ventilator from an outflow chamber for this cooling gas, and a cylindrical channel segment that is positioned coaxially to the axial compressor and surrounds the axial compressor radially, whereby the inflow chamber comprises an asymmetrical cooling gas supply, and whereby in the inflow chamber means for homogenizing the cooling gas supply to the axial ventilator are provided. In order to improve the cooling, and therefore the efficiency of the machine, the inflow chamber forms a rotation-symmetrical annular chamber in the region of an inflow opening of the channel segment. A cylindrical annular collar is positioned coaxially to the axial ventilator within this annular chamber. The annular collar projects axially into the annular chamber and forms a completely surrounding, radial throttling gap at the inflow opening.

Abstract: A turbo-type machine, comprising a casing 2 storing an impeller within an inside thereof, and a plural number of grooves formed on an inner surface of the casing in a direction of pressure gradient of fluid, wherein the grooves 124 are provided from 80 to 150 pieces around a periphery on the inner surface of the casing, and a total width of the grooves all around the inner surface of the casing is from 30% to 50% of a peripheral length on the inner surface of the casing. Also, the area on cross-section of the groove 124 within an area where the blades exist is made larger than that of the groove outside where the blades exist, or openings 127 are drilled on a bottom surface of the grooves, each penetrating through thickness of the casing, or the groove is made in a two-layer structure in the direction of pressure gradient of fluid.

Abstract: An axial/radial three-channel diffuser is provided with two guide vanes for dividing the diffuser into three partial diffusers that are distributed so that the distribution of the surface area over the three partial diffusers in the inlet surface area is uneven. The guide vanes are oriented in accordance with the total pressure field after the last rotating blade row and are arranged at a minimum distance from the trailing edge of the last rotating blade row. Because of its long extension in relation to the channel heights of the partial diffusers, the three-channel diffuser brings about a gentle deflection of the diffuser flow. The diffuser according to the invention results in an improved pressure recovery and increased turbine performance.

Abstract: Small winglets placed at the outer end of each fan blade substantially reduce the vortices created in conventional fans by the pressure differential between the low pressure and high pressure sides of the blade. The winglet acts as a barrier, which substantially blocks leakage around the blade tip, thus suppressing vortices. Technical advantages include noise reduction, because there are no shedding vortices to create noise as the blades pass the struts; increased aerodynamic efficiency of the fan, providing higher air flow for the same fan speed, size, and power, because less energy is lost in vortices; and minimal cost impacts, because housings currently used for fans can still be used with standard finger guards and because winglets and blades can be formed integrally of injection molded plastic.

Abstract: Improved housings for computing devices are disclosed. One improvement pertains to a multi-axis ventilation system. Another improvement pertains to a push button latch for a portable computer. Still another improvement pertains to a media bay ejection system provided with a dampener. These improvements can be provided separately or in any combination in a given computing device.

Abstract: A heat sink-equipped cooling apparatus capable of increasing a size of an air discharge port as compared with a prior art. A fan unit is mounted on a heat sink. The heat sink includes a base formed into a contour having first and second sides defined so that an angle therebetween is substantially 90 degrees. A side wall of the base and a casing of the fan unit cooperate with each other to provide an air discharge port at a position corresponding to sides of the base opposite to the first and second sides while being combined with each other. The air discharge port is constructed so as to permit air sucked through an opening to be discharged therethrough.

Abstract: A compressor casing includes an axially convex inner surface for surrounding a row of rotor blades with radial gaps therebetween. The tip of the blades complement the casing contour for reducing blade tip losses and flow blockage.

Abstract: The invention is a device and method which varies the pressure of a multiphase fluid comprising at least one liquid phase and at least one gaseous phase. The device comprises a housing, a hub, a rotating shaft, and at least two blades defining at least one flow channel. At least one turbulence producing structure is disposed inside at least one flow channel which generates a turbulent zone inside the the at least one channel which mixes the liquid and gaseous phases of the multiphase fluid.

Abstract: An air moving device in the form of an axial flow fan is provided that is adapted for use in substantially enclosed high-density electrical systems, e.g. computers and the like. The fan includes an annular wall extending about the blades thereof and in which pressure equalizing openings are formed for increasing the maximum pressure in the preferred operating area of the fan and just before the stall effect occurs due to increasing system pressure resistance. A method is also provided for optimizing the number and size of the slots to obtain a desired maximum pressure increase. The slots are optimized so that there is no appreciable airflow loss in early stages of the preferred operating area while providing the desired increase in maximum pressure. The slots preferably have an elongated shape, e.g. rectangular or oval, with a major dimension extending generally axially and parallel to the axis of rotation of the blades, and are spaced from each other circumferentially about the annular wall.

Abstract: A turbine casing supports a row of nozzle vanes through which are flowable hot combustion gases. A baffle surrounds the casing to define a cooling duct. A nacelle surrounds the turbine casing to define a bay having an inlet for receiving bay air, and an outlet for discharging the air. The cooling duct includes an inlet which receives the bay air for flow along the turbine casing for selective cooling thereof.

Abstract: The present invention is intended to implement a high-temperature, high-pressure, high-output, high/low-pressure integrated steam turbine provided with a turbine rotor formed as an integral rotor member. It is provided with a high-pressure turbine (3) to which primary steam (20) is supplied, a low-pressure turbine (5) having last-stage turbine rotor blades (47), a turbine rotor (2) formed of an integral rotor member, an integral casing (6), and a downward-exhaust type of exhaust chamber (15); it has a rated power of at least 100 MW; the last-stage turbine rotor blades are rotor blades of an effective blade length of at least 36 inches rotating at 3000 rpm, or are rotor blades of an effective blade length of at least 33.

Abstract: An environmentally non-intrusive multiple turbine unit for adjustable deployment in water. The turbines are captured in a shroud having an integrally formed augmentor ring and ballasting member to improve efficiency. The multiple turbine arrangement effectively counteracts the rotational counter-torque of individual turbines, thereby enabling stable deployment of the unit without requiring rigid stabilizing structures.

Abstract: A fluid machine comprising a fluid storage tank (1), provided with an inlet (2) and at least with one outlet nozzle (3), and in the area of the outlet nozzle (3) there is mounted, on a holding device (4), at least one rolling rotor (5) represented by a body of a rotary shape.

Abstract: An exhaust system for a marine gas turbine may suppress a reduction of an efficiency even if a space therefor is small. In the exhaust system for a marine gas turbine, in which an end portion of an exhaust diffuser 2 is assembled into an exhaust chamber 1 connected with an upper exhaust eductor 4, the end portion of the exhaust diffuser 2 is disposed in the vicinity of an inlet of the exhaust chamber 1. An outlet 2a of the exhaust diffuser is slanted so that an upper portion of the outlet of an end of the exhaust diffuser is located upstream of a lower portion of the outlet. As a result, the exhaust gas may readily flow around and into the exhaust eductor 4.

Abstract: A bearing housing in a bowl of a vertical turbine pump for a lower bearing of a rotatable pump shaft on which an impeller is mounted includes a separable hollow substantially cylindrical housing body with upper and lower ends, having a radial flange at its lower end adapted for sealing attachment to a bottom face of the bowl such that it is capable of installation in and removal from the bottom face of the bowl, the housing body also having an inside diameter greater than an outside diameter of the shaft to provide a clearance therebetween. A bearing is fixed within the lower end of the housing body for journaling the shaft therein, and provision is made for sealing between the upper end of the housing body and an internal axial bore in the bowl. A seal is also provided between the lower end of the housing body and the shaft for excluding pumped fluid from the clearance.

Abstract: A centrifugal pump having a housing which includes an impeller mounted in the housing. At least one guide vane is mounted between a hub and the housing and in-line with the impeller. The guide vane has a leading guide. A recess is provided in proximity to the leading edge of the guide vane providing a connection between the spaces located on both sides of guide vane to prevent clogging of the impeller by fibrous components flowing in pump medium.

Abstract: A duct fixed to a vehicle propelled through an ambient fluid medium is innally provided with spaced channel passages from which the fluid medium is ejected under pressure tangentially of local duct surfaces through Coanda affected slots at the trailing edge of the duct from which only the ejection of the fluid medium occurs. The supply of the pressurized fluid medium under selective control is limited to different angular segments of the channel passages in order to modify the flow stream through the duct so as to perform certain functions such as thrust control and steerage control effects enhancing vehicle maneuverability.

Abstract: A stationary screw induction system for improving performance of a watercraft has a cylindrical housing with a first closed end and a second open end. A housing inlet opening is disposed within the housing between the first and second ends. Disposed within the inside of the cylindrical housing is an induction screw which is a helical shaped surface radially disposed about a spine which is coincident with the central axis of the cylindrical housing and forms the central section of the induction screw. The helical shaped surface has a leading edge in contact with the spine and an outside edge in contact with the inner surface of the housing. An induction channel acts to conduct fluid from the surrounding environment into the stationary screw induction system. The induction channel has an induction inlet which acts in fluid communication with the housing inlet opening.