Abstract: A fuel feed device having a first pump assembled with an electric motor in a sheet-metal shell to form a self-contained unit. The drive shaft of the motor projects from the unit and is drivingly connected to an impeller of a second pump whose housing surrounds the impeller. The housing of the second pump surrounds part of the self-contained unit and a sleeve is pushed over the self-contained unit with clearance therebetween and is connected at its lower end to the second pump housing and forms a seal with the self-contained unit by a holding ring and an elastic membrane. The device is easily adapted to casings of the first pump of any form and shape and to requirements, such as changes in filter size, mounting in the fuel tank, and for different types of second pumps.

Abstract: The invention relates to a pump, in particular to an axial piston pump of the swash plate type, wherein the suction pressure medium is fed into the swash plate chamber, so as to be arranged in layers of different pressure. The pressure medium is removed from a desired pressure layer and supplied to the pump chamber so as to obtain a desired pump flow characteristic.

Abstract: A variable displacement piston pump (10) including a plurality of axially aligned pumping cylinders (24) with a drive shaft (40) extending there between having a tiltable swash plate (30) disposed in a relatively dry cavity at one end of the drive shaft (40) for operating the pumping cylinders, and a reaction thrust plate (38) on the other end of the drive shaft (40), for providing reaction force in the drive shaft (40) opposite that provided by the swash plate (30). An inlet shaft seal (72) prevents fluid, which enters the pump at the inlet port (12), from filling the mounting housing (17) and submerging the mount shaft (44) portion of rotating assembly (16) and its supported swash plate (30). Two needle roller bearings (67) support the swash plate (30) and transmit torque from the drive coupling (19) to the swash plate (30). A high pressure fluid restrictor (70) meters hydraulic control fluid to the two needle bearings (67 ).

Abstract: A pump, particularly, for pasteous masses, includes a rotatable outer wheel provided with a plurality of inner teeth, a pinion rotatable inside the outer wheel eccentrically thereto and having a plurality of outer teeth, the outer wheel and the pinion forming an intermediate space therebetween, a pressure seqment located in the intermediate space between the outer wheel and the pinion, an inlet and an outlet which are offset relative one another in direction of rotation, and a filling device connected with the inlet, the filling device including a filling container and a feeding element arranged in the filling container and having a feeding direction so as to feed a mass toward the inlet.

Abstract: A press for the preparation of raw plastic material blanks is described. It has a feed device connected to a rotor housing in which a circular rotor is eccentrically supported for the generation of pressure and the transport of the material. Rotor housing and rotor form a tapering channel. The circular rotor has at least one axially extending material transport ridge forcibly guided along a guide rail located in the rotor housing. At its smaller end the tapering channel forms an extrusion gap which opens into an outlet opening for the plastic material, to which a nozzle is attached.

Abstract: An apparatus and method for raising liquids from one level to a higher level by means of a centrifugal pump operating in air for minimum drag, is described. A sealed tank is half filled with liquid and the remaining space is subjected to an externally applied pressure, thereby raising the liquid in a tank exit tube to a height determined solely by the pressure in the tank. Further liquid is introduced into the tank, against the pressure therein, by means of a rotating inlet tube provided with a plurality of radially extending exit tubes which rotate about a vertical axis in the air space above the liquid in the tank. The inlet tube is rotated by means of an electric or other power source located either internally or externally of the tank.

Abstract: Apparatus for removing manure from a manure pit or lagoon comprises an elongate screw-type auger having an inlet end which is inserted into the manure, and a suction hose from a vacuum wagon connected to the auger outlet. The combined action of the mechanical auger screw with the applied suction is effective in removing manure of widely varying liquid content from the pit or lagoon.

Abstract: An arrangement for feeding a fuel from a supply tank to an internal combustion engine, the arrangement comprises a motor; a multistage feed pump unit driven by the motor and including a flow pump having a rotor and a gerotor pump having an inner runner arranged so that the rotor and the inner runner have aligning axes of rotation and the flow pump is arranged upstream of the rotor pump as considered in the flow direction of a fuel, the rotor of the flow pump and the inner runner of the gerotor pump being located near one another as considered in an axial direction, the gerotor pump also having an outer runner which surrounds a feed chamber, and the rotor of the flow pump having a wall which axially limits the feed chamber surrounded by the outer runner of the gerotor pump.

Abstract: A motor-driven radial plunger pump has an outer housing enclosing a motor section and a pump section drivingly connected thereto. The motor section has a motor housing cooperating with the outer housing to define a fluid passage having a fluid inlet adjacent to a part of the motor housing in which a brush unit is disposed. The fluid passage contains a filter element and has a recess disposed upstream thereof and adjacent to motor magnets so that magnetic particles contained in the fluid flow are magnetically adhered to and deposited on the bottom of the recess. The pump section has a rotor with radial plungers slidably disposed in cylinder bores in the rotor. The cylinder bores have radially inner end successively communicated with a suction passage communicated with the fluid passage between the outer and motor housings through feed holes formed in a coupling disc plate drivingly connecting the motor with the rotor.

Abstract: A self-priming pump comprises a casing enclosing first and second impellers rotating on a common shaft. The first impeller in an associated impeller cavity pumps a liquid from an inlet to a first output port. The second impeller in an associated impeller cavity pumps the liquid from the inlet via an intake port to a second output port, the second impeller having a positive displacement for evacuating gas from the first impeller cavity. The first and second output ports are connected to an outlet with means provided for preventing reverse fluid flow into the first output port.

Abstract: Arrangement for facilitating the start-up of not self-priming centrifugal mps for the pumping of radioactive liquids in a nuclear fuel reprocessing plant wherein radioactive liquid is pumped from a first to a second container through the container's top by means of transfer piping which includes a centrifugal pump having its suction side in communication with one container and its discharge side connected to a supply pipe leading to the other container. The supply pipe includes a pressurized air operated jet pump adapted to lift, during start-up, liquid from the container into the centrifugal pump which is then operated to pump the liquid from the one container to the other through the jet pump.

Abstract: A high speed centrifugal fuel pump delivers fuel to the main metering valve of a fuel control of a gas turbine engine for feeding the engine's burners, and a boost pump and positive displacement pump pressurize fuel for the servo medium for actuating the various valves and engine geometry actuators. The boost pump also assures that the vapor/liquid flow relationship satisfies the engine's requirements.

Abstract: A pump for pumping a mixture of a liquid and a coarse-grained material comprises a motor-driven rotor (1) having a plurality of longitudinal cylinders (5, 6, 7, 8) having individual piston members (9), whereby these are driven back and forth by means of a pressure medium which is supplied to one end of the rotor. At the other end of the rotor, the cylinder openings, during rotation, pass a stationary inlet channel (21) and a stationary outlet channel (22) for the mass that is to be pumped. The rotor (1) is designed as a truncated cone, the cylinders being obliquely positioned with respect to the axis of rotation and having the greatest radial distance thereto at the cylinder ends which cooperate with the above-mentioned inlet and outlet channels.

Abstract: An improved pump assembly is used to supply fuel to an aircraft engine and includes a positive displacement pump which supplies fuel during low speed operation of the pump assembly and a centrifugal pump which supplies fuel during relatively high speed operation of the pump assembly. The positive displacement pump has a plurality of vanes connected with an impeller of the centrifugal pump. The vanes are forced radially inwardly against a stationary cam surface by fluid pressure. The fluid pressure is conducted from an outlet of the positive displacement pump through a passage in the impeller of the centrifugal pump to pressure chambers disposed at outer ends of the vanes. By providing the fluid pressure passage in the impeller of the centrifugal pump, the axial length of the pump assembly tends to be minimized. The positive displacement pump is rendered ineffective to pump fluid when the output pressure from the centrifugal pump equals the output pressure from the positive displacement pump.

Abstract: A pump which is especially suited for pumping fuel from a storage tank to an internal combustion engine includes a rotatable impeller wheel having an annulus of impeller vanes defining respective compartments therebetween which open onto one axial surface of the impeller wheel which extends substantially normal to the axis of the rotation of the impeller wheel, and an end wall having an end surface which is juxtaposed with the axial surface of the impeller wheel and defines an interface therewith. The end wall is provided with a pumping channel which extends along a part-annular course along the trajectory of orbiting movement of the impeller vanes and opens onto the interface. The pressure of the fluid being pumped by the impeller vanes increases in the downstream direction of the pumping channel and exerts a tilting moment about an axis normal to the rotation axis on the impeller wheel.

Abstract: A preferred method includes pumping extrudable and compressible lubricant storage and wicking material from a supply hopper and into a supply conduit wherein passive valve means are utilized so that material is automatically supplied to a pump mechanism from the hopper and automatically prevented from being urged back into the supply hopper while the material being pumped is being forced out of a pumping chamber. In a most preferred form, the method includes utilizing pressure differentials established by the pump means to control the valving action of a valve or flow control member that is interposed between a pumping chamber and a supply hopper.Apparatus embodying the invention in one preferred form includes means for rotating an auger as well as stirring rods (if so desired), and means for operating a reciprocating positive displacement pump in a pump chamber which is supplied with material from the continuously rotating auger.

Abstract: There is described a pump assembly which, in a unitary structure, comprises an electric pump drive motor and a two stage pump contained within a common housing. The motor drives the first stage of the pump upstream of the second stage which supplies the fuel, by creating a higher output from the first stage, which supply pressure is produced on the suction side of the second stage to maintain the pressure build-up in the pump. An air discharge is provided ahead of the inlet to the suction side of the second stage to dispell gases created in the fuel by the elevated pump pressures.

Abstract: A fuel supply pump is proposed where the pumping system comprises two individual pumping stages connected in seriatim and are both driven by the motor armature of an electromotor located in a common housing, and further where the drive of the pumping stage adjacent to the electromotor is accomplished by means of a contactless coupling assembly including permanent magnets fixed in the hub areas of the rotating parts of the adjacently disposed pumping stages. In a further preferred embodiment of the invention the permanent magnets are operatively associated by being in radial alignment but not in contact with each other and are separated in a pressure-tight manner by means of a rigid flange-like element inside the housing of the fuel supply assembly.

Abstract: A pump has a pump driven impeller mounted immediately adjacent the port plate which cooperates with a collector to increase the tangential velocity of fluid entering the inlet port to substantially equal that of the barrel cylinder ports.

Abstract: A fuel pump assembly for supplying fuel to a gas turbine engine has a centrifugal pump, including an impeller, that furnishes the necessary pressure for engine operation at high engine speeds. A vane pump, attached to the back side of the impeller of the centrifugal pump, supplies fuel to the engine for starting and acceleration to idle. The vane pump is of the type having a stationary centrally disposed cam and an annular rotor with radially inwardly directed vanes which ride over the surface of the cam. Before idle speed is attained, the vanes which are substantially hydraulically balanced and made of a light plastic material are adapted to lift off the surface of the cam without the need of pressure relief behind the vanes.

Abstract: A pump set comprising a compressor followed by a liquid ring vacuum pump with the two pumps matched to each other so that a relatively small liquid ring vacuum pump can draw and maintain vacuum under 40 Torr.

Abstract: A method for the ventilation of fuel supply pumps as well as a new type of fuel supply pump are proposed which, particularly in pumps having two pumping stages coupled in series within the housing, serve to secure the ventilation of the first pumping stage. Preferably the first pumping stage is embodied as a lateral channel pump which has a forward anterior base plate. The ventilation bore is arranged axially at first in the base plate and in association with the lateral channel and is preferably formed during manufacture in one piece with the base plate; a reduction of the overly-large diameter of the ventilation bore is effected by the insertion of a reduction part to achieve the flow cross section required for ventilation. The ventilation to the outside of the lateral channel stage takes place via an external connection nozzle on the pump housing, which is secured thereon either axially or radially and can be embodied in one piece therewith as necessary.

Abstract: A high-vacuum pump is disclosed as including a molecular pump assembly and an oil-seated rotary pump assembly, a speed change mechanism being interposed between the two assemblies so as to transmit driving forces, with a predetermined ratio, between the assemblies. The molecular pump assembly includes a housing having inlet and outlet ports, and spiral grooves, including main and subsidiary grooves, are provided upon interior wall surfaces of the housing so as to establish fluidic communication between the ports. A vacuum-sealed rotor, suitably mounted upon a first drive shaft, is rotatably disposed within the housing so as to achieve a compression and pumping operation of fluid along the spiral grooves from the inlet port to the outlet port, and the oil-sealed rotary pump assembly is likewise provided with inlet and outlet ports, the inlet port thereof being directly connected to the outlet port of the molecular pump assembly.

Abstract: An apparatus for compressing gaseous fluid including a reciprocating compressor and a receiver or tank connected with the compressor for receiving the compressed gaseous fluid. The compressor includes one or more cylinders supported on a crankcase having a rotating crankshaft therein with throws connected by connecting rods with pistons reciprocating in the cylinders. Discharge valves are reciprocably mounted at ends of the cylinders and are of a size substantially that of the cross-section of the cylinder bore and opening in response to pressure in the respective cylinders.

Abstract: A self-priming centrifugal pump including a priming piston disposed in a priming chamber which communicates with the pumping chamber to receive fluid therefrom. During priming, the priming piston is driven by the impeller shaft through an eccentric to discharge such fluid from the priming chamber. During normal operation of the pump, that is after the pump has been successfully primed, the priming piston is retained out of driven relationship with the eccentric by fluid supplied from the pumping chamber, thereby preventing the priming piston from taking power from the pump during such normal operation.

Abstract: Apparatus for eliminating cavitation in a main pump in which the rotor of a supercharging pump is connected to the rotor of the main pump such that the latter rotor drives the rotor of the supercharging pump. Permanent communication is established between the delivery side of the supercharging pump and the induction inlet of the main pump. A hydraulic fluid reservoir is connected to the inlet of the supercharging pump and it is also connected to the delivery side of the supercharging pump through the intermediary of a valve which controls the flow of hydraulic fluid to the reservoir from the delivery side of the supercharging such that when the pressure at the induction inlet of the main pump exceeds a predetermined value flow is established to the reservoir in order to avoid the appearance of cavitation in the main pump. Leakage flow within the main pump is also recycled to the reservoir continuously through the valve.

Abstract: A three-section pump including a variable displacement piston pump and an additional rotary pump arranged in axial alignment upon a common drive shaft together with a centrifugal pump, the output for the centrifugal pump being connected to the input for the piston pump in order to assure positive filling. Preferably, the output for the centrifugal pump is also connected with the input for the additional rotary pump in order to also assure its optimum operation. The three-section pump includes a specially configured housing permitting compact assembly of the three-section pump and providing a bearing mount for the common drive shaft of the three-section pump.

Abstract: This invention relates to an electromechanical pumping and fuel metering means interfacing an electronic fuel control adapted for small engines. A centrifugal engine driven pump and electrically driven pump are combined such that the electrically driven pump pressurizes the fuel at low crank up speeds and continuously meters fuel to the burner section and the centrifugal pump pressurizes the fuel at all other times, so as to utilize the centrifugal pump during its high efficiency regime and the electrically driven pump when the centrifugal pump is not at its high efficiency regime.

Abstract: Method and apparatus for pumping fuel to jet engines and the like utilizing at least two stages, the first of which is a main stage including a centrifugal pump, together with a secondary stage including a positive displacement pump. The two pump stages are driven from a common drive means. In the new system, the positive displacement pump is used as a startup pump and the centrifugal pump is the sole pumping means employed during conditions of higher fuel demand. Speed responsive means are provided in conjunction with the positive displacement pump, which means are responsive to the speed of the centrifugal pump, the speed responsive means being used to terminate pumping action by the positive displacement upon the centrifugal pump reaching a predetermined speed.

Abstract: A gear-driven transport ring rotates around a toroidal chamber. Spaced sealing rings carried by the transport ring divide the chamber into compartments which serve to transport liquid from a feed station to a discharge station. Gas or vapor pressure is employed at the discharge station to bring the liquid up to desired discharge pressure and to transport it to, for example, the feed water intake of a steam boiler.