Abstract: A gas turbine stationary vane having an airfoil portion and inner and outer shrouds. Five serpentine radially extending cooling air passages are formed in the vane airfoil. The first passage is disposed adjacent the leading edge of the airfoil and the second passage is disposed adjacent the trailing edge. A first portion of the cooling air enters the first passage, from which it flows sequentially to the second, third, fourth and fifth passages. Additional cooling air enters the third passage directly, thereby bypassing the first and second passages and preventing over heating of the cooling air by the time it reaches the fifth passage. A radial tube extends through the second passage and directs cooling air through the airfoil, with essentially no rise in temperature, to an interstage cavity for disc cooling. Fins project into each of the passages and serve to increase the effectiveness and flow rate of the cooling air.

Abstract: A system and method for resisting thermoacoustic oscillations in systems comprised of hot and cold components is disclosed. More particularly, a combined cycle power generation system 32 having a gas turbine 40, a gas turbine discharge duct 34, and a gas turbine recuperator 36 and 38 is disclosed. The system 32 is designed to resist severe thermoacoustic oscillations over its entire load range by providing for an asymmetrical arrangement of the hot section L-l, including the gas discharge duct 34 and the plenum 36 of the recuperator, and the cold section L-l, including the heat exchange tubes 38 of the recuperator. Also disclosed is a steam generation system 42 having a plenum 46, a burner 48, and a furnace 44. The steam generation system 42 is also designed to resist severe thermoacoustic oscillations by providing for an appropriate burner length L and by providing for an asymmetrical arrangement of a hot burner section L-l and a cold burner section l within the burner 48.

Abstract: A vacuum pump control apparatus for an evacuating-type waste water collecting system is disclosed. In the system, waste water discharged from houses and facilities is collected into a water collecting tank by vacuum sewer pipes provided with a negative pressure therein, and the waste water collected in the water collecting tank is discharged by a booster pump while the air in the water collecting tank is discharged by a vacuum pump. The vacuum pump control apparatus comprises a gas-liquid ratio detection arrangement for detecting the ratio of the amount of air to the amount of waste water to be collected into the water collecting tank, and a control system for regulating the operating time of the vacuum pump based upon the gas-liquid ratio detected by the gas-liquid ratio detecting arrangement, so that a target value of the gas-liquid ratio is recovered when it falls below the target value.

Abstract: A pulsatile pump the output of which is infinitely variable between a slow pulsatile flow and increased up to a sharply pulsed flow rate until the pulses run together and a smooth flow results, and which may be varied between wide output pressure and frequency limits. The pump is comprised of a pneumatic control circuit, at least two pneumatically isolated compression chambers, and a novel inlet/outlet pump cartridge and condition-responsive locking means. Operation of the pump is controlled by the use of novel tactile pneumatic response switches. Each compression chamber is communicated with a supply of working fluid through the cartridge. Means are provided for varying the operation of the pneumatic circuit and hence the pump. A flow of pressurized fluid, such as air or nitrogen, is used as the operating media of the pneumatic circuit, although other fluids may be used. Means for monitoring and adjusting pump system parameters are also provided.

Abstract: A hermetic motor compressor comprising a shell formed by an upper and a lower cap connected one to the other in such a way that an airtight closure is obtained in the shell, and by feet fixed to the lower cap for positioning the shell in the correct position during its working, the lower cap defining lower cap lateral surfaces having a very large curvature radius connected to first, second, third and fourth curved surfaces. First and second curved surfaces being connected to a lateral plane and third and fourth curved surfaces being connected one to the other, the lower cap defining a sphere-shape in a lower part thereof and a band in the upper part thereof which is joined to the upper cap.

Abstract: A fuel pump has a motor mounted within a housing with a shaft extending therefrom to which a helically shaped impeller is fitted having at least two turns for pumping fuel from a fuel tank to an automotive engine. The impeller has an involute shaped leading edge designed to efficiently scoop fuel from an inlet into a pumping chamber formed between the helically shaped blade turns comprising the impeller. A trailing edge on the impeller has a narrowed width which increases the effective flow cross-sectional area, thus increasing the fuel pressure. The helically shaped impeller needs no separate casing, as is typically required for conventional fuel pumps employing regenerative turbines, gerotors, roller vanes, or the like, and increases fuel pressure over a longer circumferential distance thus decreasing cavitation.

Abstract: A pump, submerged in a fluid in a pump or well, has a buoyant outer, enclosing casing. Communicated to the casing are a conduit to supplying compressed air to the casing, a conduit for carrying the exhausted air away from the casing, an inlet and check valve for permitting entry of fluid into the casing, and an outlet and a check valve connected to discharge piping for carrying fluid away from the casing. The outer casing slides vertically relative to the discharge piping and is supported by the discharge piping for vertical movement between upper and lower stops where the casing actuates an air exhaust valve and a compressed air inlet valve. When the buoyant casing is in the upper position, air within the casing can escape through the open chamber air exhaust valve and compressed air entry is blocked to the casing through the closed compressed air inlet valve.

Abstract: A swash plate type variable displacement compressor comprises cylinder bores, pistons, a suction chamber and a discharge chamber. A suction valve introduces a low pressure gas into a working chamber in each cylinder bore. A discharge valve introduces a high pressure gas in the working chamber into the discharge chamber during a compression stroke. A crank chamber communicates to each of the cylinder bores at rear sides of the pistons. A swash plate is tiltably supported on a drive shaft and connected to each of the pistons through associated rods. The swash plate makes the pistons reciprocate in response to its undulating swing motion and varies its inclination angle based upon pressure differential between pressure in the suction chamber and pressure in the crank chamber therefore adjusting discharge displacement.

Abstract: A peristaltic pump having a pump conduit with an occlusive inlet segment. The pump includes a frame with rollers carried by rotor and rotated by a motor. A flexible conduit having an inlet end and an outlet end is positioned around the rollers and includes an occlusive segment and non-occlusive segment. In its free condition, the occlusive segment is collapsed and the passageway through it substantially completely occluded when the pressure within the occlusive segment is equal to or less than pressure acting on the outside of the occlusive segment. The non-occlusive segment is mildly biased to exhibit an inflated condition with an open passage when in its free condition with the pressure within the non-occlusive segment equal to pressure acting on the outside of the non-occlusive segment.

Abstract: A turbine frame includes outer and inner coaxially disposed annular casings having a plurality of circumferentially spaced apart struts extending therebetween is provided with at least one and preferably two axially spaced apart polygonal stiffening rails, a forward rail and an aft rail, circumferentially disposed on the outer annular casing. The rails have at least a first section with a constant cross-sectional area normal to the casing in a circumferential direction around the outer casing, a linear centroid distribution of the cross-sections in the circumferential direction, and the centroids lie in a first plane P1 which is parallel to and spaced apart from a second plane P2 that is tangential to the outer casing mid-way between adjacent struts.

Abstract: A peristaltic pump includes a pump race for receiving a flexible tubing. A rotatable pump rotor carries at least one roller for contacting the tubing. A roller locating mechanism moves the pump roller between a retracted position free of contact with the tubing and an extended position making operative contact with the tubing. A controller operates the pump (i) in a pumping mode, during which the rotor is rotated with the roller located in its extended position, and (ii) in a valving mode, during which rotation of the rotor is terminated and the roller is selectively moved between its extended position to block fluid flow through the tubing and its retracted position to permit fluid flow through the tubing. The pump thus provides a peristaltic pump pumping function, as well as serving as a valve element.

Abstract: An axial-flow pump combined with an electric motor coaxially arranged therearound. The rotor (1) and stator (2) are common to both the electric motor and the pump. The rotor comprises a central tubular portion (11) defining a central channel (14) with a wall (15) provided with blades (16). The blades preferable do not extend as far as the channel axis (3) so that they define a central free area therealong. The outer portion of the rotor (1) has pairs of permanent magnets (24, 25) with stator coils (9) therebetween. The coils are actuated and deactuated by an electronic switching device (28) controlled by sensors (36, 37) for sensing markings on the rotor. The length of the rotor is smaller than its outer diameter. Said pump may be used to pump liquids or gases and drive vehicles, particularly submarines.

Abstract: A positive displacement centrifugal pump comprises (a) a pressure generating mass rotatable about a first axis and radially movable relative to it upon rotation of the mass, (b) a pumping unit, and (c) a flexible, non-elastic tensioning element operatively connected to the mass and operable in the course of rotation of the mass to cause the mass to move radially inwardly toward the axis so as to effect intake and/or exhaust of fluid within the pump.

Abstract: A fluid intensifier (10) includes an unequal-area pump piston (11) and a drive piston (14). The large-area pump piston chamber (21) communicates with the small-area pump piston chamber (29) via a communicating conduit (30) having a check valve (25) therein. The pump piston is coupled to a drive piston (14) having a lost-motion connection (18) with a two-lobed pilot valve spool (41). The pilot valve (16) controls a pilot pressure in the spool end chamber (60) of a spring-biased control valve (19). The fluid intensifier is automatically reversing as the pump piston approaches either end of its stroke, and is arranged to provide a substantially-constant intensified fluid pressure (P.sub.i) at an outlet.

Abstract: A reciprocating pump particularly useful in ventilator apparatus includes a piston reciprocatable axially within a cylinder and dividing its interior into an inlet chamber and an outlet chamber, a wall fixed within the inlet chamber, and a drive housing fixed to the wall. The drive housing includes a motor, a rotor rotatable by the motor, a nut rotatable within the drive housing, and a screw threadedly coupled at one end to the nut and fixed at its opposite end to the piston. The piston is substantially unrestrained for axial and rotary movement such that forward and reverse rotation of the nut by the motor reciprocates the screw and the piston axially of the cylinder, and also permits the screw and the piston to rotate with respect to the cylinder to thereby even out wear between the piston and cylinder.

Abstract: A centrifugal pump system including a pump having a rotating seal disposed therein, the temperature of the seal being substantially maintained at an acceptable level by circulating a temperature stabilizing liquid to and from a chamber arranged immediately adjacent the rotating seal. A cooling or barrier tank is positioned adjacent the pump, the cooling tank for receiving the temperature stabilizing liquid from the chamber, allowing it to cool, and directing it back into the chamber thereby maintaining the temperature of the liquid adjacent the rotating seal at a substantially constant and acceptable level. A blower or fan is positioned adjacent both the pump and the cooling tank so as to simultaneously blow air across both of them in order to maintain the temperatures of the pump motor, the liquid within the cooling tank, and the rotating seal at acceptable levels.

Abstract: A medical infusion pump (10) using a pump chamber cassette (86) has a housing (20,22) defining a pump chamber cassette receptacle (84) and a pump driving mechanism (250) for propelling liquid through the pump chamber cassette. A door (50) holds the pump chamber cassette (86) within the cassette receptacle (84) in an operative position relative to the driving mechanism (250). The cassette includes an elastomeric conduit (132), a frame (134) and clips (146,148) for attaching the elastomeric conduit (132) to the frame (134) for holding the elastomeric conduit (132) in a select position relative to the pump driving mechanism (250) of the infusion pump upon placement of the cassette (86) in an operative position relative to the pump driving mechanism (250).

Abstract: In a method for regulating a gas-turbine assembly, essentially consisting of a compressor unit (1), of an HP-combustion chamber (4), of an HP-turbine (6), of an LP-combustion chamber (9), of an LP-turbine (12) and of a generator (14), the rating of the fuel quantity (FH) for the HP-combustion chamber (4) is carried out responsive to a corrected temperature signal which is formed by the value of the temperature (T13) at the outlet of the LP-turbine (12), reduced by the particular temperature rise (.DELTA.T) detectable there. This temperature signal (T13-.DELTA.T) is recorded in that the temperature rise (.DELTA.T) generated by the fuel quantity (FL) introduced into the LP-combustion chamber (9) is subtracted from the measured temperature at the outlet of the LP-turbine (12). The uncorrected temperature signal at the outlet of the LP-turbine (12) is used for rating the fuel quantity (FL) for the LP-combustion chamber (9).

Abstract: A multistage vacuum pump is achieved by utilizing a single piston and cylinder assembly having opposite end portions with substantially equal diameters and an enlarged diameter central portion. One end of the cylinder is closed by a valve and a first stage pumping chamber is defined between the valve and the piston. The enlarged diameter portion of the piston has an axial extent less than the axial extent of the enlarged diameter portion of the cylinder to define second and third stage pumping chambers on opposite sides of the enlarged diameter portion of the piston. The three pumping chambers are interconnected by passage means to an inlet and outlet to provide a sequential reduction in pressure. A single drive unit may be connected to a plurality of pumping units for reciprocating the piston in each pumping unit.

Abstract: A power breaker for a compressor for automobiles including a base provided with a first conducting member and a second conducting member, a circular plate disposed within the base and having a center hole, a resilient disc arranged on the circular plate and including annular portion on which is fitted a diaphragm, a pin inserted through the center hole of the circular plate and having one end bearing against the diaphragm of the resilient disc and another end against the first conducting member, a control disc arranged on the resilient disc, a sealing ring disposed on the control disc, a plug formed with a cavity at one end and a curved recess at another end, a spring mounted in the cavity of the plug, a cover engaged with a top of the base and having a threaded hole, and an adjusting screw threaded engaged with the threaded hole of the cover.