Abstract: The present invention provides a pump arrangement formed with a plastic pump housing and a motor housing secured to one another. A heat transfer member extends between the housings for picking up heat generated in the pump chamber of the plastic pump housing and transferring the heat for dissipation internally of the motor housing.

Abstract: A heat-pump arrangement with an installation consisting of a motor and a compressor of trochoidal type construction adapted to conditions of heat pump systems to have the smallest structural size and nominal heat spread arranged between heat storage or accumulator and outlet large heat quantities per time unit passing therethrough as well as also being able to operate economically at low partial load range of operation. An intermediate part is provided between a motor and a compressor. Two annular chambers are arranged parallel and axially next to each other. An annular chamber is located toward the motor. The middle part has a dual-arc troichoidal-shaped casing or mantle runway and two side parts which have an eccentric shaft passing therethrough at right angles to the side parts; a triangular piston rotates upon an eccentric of the eccentric shaft for the motor and a compressor of the same type of construction is also arranged on the same eccentric shaft shared in common with the motor.

Abstract: The invention concerns a reciprocating pump whose plunger (10) is connected with a plunger rod (12) that runs in a stuffing box (13) coordinated with the pump cylinder (9) cap and is reciprocated hydraulically, where the cylindrical walls of the pump cylinder (9) are provided, over their entire length, with flow-through openings for a cooling medium passing through them, and the flow-through openings in the cylindrical walls of the pump cylinder (9) are connected to a coolant circuit.

Abstract: A canned motor pump having improved dielectric strength at a high temperature above 200.degree. C. is disclosed in which a jacket is arranged on an outer wall of the canned motor section, to an inlet port of which jacket is supplied a portion of pressurized liquid to be treated, while an outlet port of said jacket is connected to a lower pressure zone of the pump section or pump tubing system to circulate the liquid thereto. In accordance with the canned motor pump, the efficient cooling of the canned motor and the economically advantageous pump system without energy loss may be achieved.

Abstract: A completely sealed, self-contained, liquid-cooled gas compressor is disclosed. It is made up of vertically superimposed and motive power connected electric motor, gas compressor and oil pump coaxially positioned within a vertical sealed cylindrical housing providing an oil sump at its lower end. Heat exchanger tubes are mounted within the oil sump and in an externally mounted heat exchanger for cooling the oil in the sump and cooling compressed gas derived from a series of compressor stages. Cooled oil is caused to continuously flow over the electric motor and compressor to provide cooling and lubrication and sealing of compressor pistons. A special type of axial swash or wobble plate compressor is used to obtain coaxial alignment and direct connection of motor driven shafts.

Abstract: The invention taught herein is for an electrically-operated air compressor unit in which the motor and the air compressor are hung under the floor of the railroad car perpendicular to the floor in series, so that the required space under the floor of the railroad car is only the space occupied by the motor, and the space of the air compressor can be eliminated.

Abstract: A screw compressor assembly includes a motor housing section, a compressor section and an oil separator downstream of the compressor discharge port. The motor housing section defines a flow path for suction gas traveling to the working chamber of the compressor so that the compressor drive motor is cooled by suction gas. The motor housing section also internally defines an integral heat exchange structure through which a passage for the flow of oil is defined. Discharge pressure in the oil separator drives separated oil into the passage in the motor housing heat exchange structure prior to the delivery of such oil to compressor surfaces requiring lubrication. The oil flowing through the integral heat exchange structure is cooled by the suction gas passing over the surface of the heat exchange structure interior of the motor housing.

Abstract: In a rotary compressor for refrigerants of the type having, within a sealed case, a refrigerant compressing device and a motor disposed thereabove for driving the same and having a vertical rotor shaft, an oil-separating member of umbrella shape with a downwardly-directed peripheral rim is disposed coaxially above and fixed relative to the top end of the rotor and functions to guide compressed refrigerant containing lubricating oil particles toward and through the motor windings of the motor thereby to separate the oil particles from the refrigerant, which is then delivered under pressure.

Abstract: A piston-type compressor for gaseous media, e.g. a brake air compressor for automotive vehicles, particularly a compressor having capacity control means, is provided with an externally arranged lubricant pump for supplying the lubricant from a storage reservoir which is positioned below the compressor to a lubrication circuit of the compressor. A downwardly extending return line for the lubricant is provided between the otherwise enclosed crankcase of the compressor and the storage reservoir. In order to prevent a build-up of superatmospheric pressure in the crankcase, a self-acting check valve is installed in the return line the check valve serving to block flow of lubricant through the return duct toward the crankcase of the compressor.

Abstract: The uncovering of the opening of the oil pickup tube is avoided by preventing the formation of a stable vortex. The prevention of the formation of a stable vortex is achieved by making the paddles of the impeller axially asymmetrical by at least a minimum critical value.

Abstract: There is disclosed herein a liquid spray gun which includes an improved heat dissipation system and an improved leakage flow recirculating system.The improved heat dissipation system results from an improved and stronger air flow through the gun housing and around the electromagnetic coils. The improved air flow is created by a venturi or aspiration effect at the spray tip created by the action of the piston pump in spraying liquid at high velocity reducing the air pressure adjacent the tip. The internal portion of the housing communicates with the low pressure area so air in the housing is drawn from the housing to the low pressure area. Vents are provided in the housing adjacent the electromagnetic coils for outside air to be drawn into said housing over said coils and to the low pressure area, thus improving air flow and heat dissipation.

Abstract: A cup-like device, called a deturbulator, having a solid base portion and vertically oriented finger-like elements extending therefrom is disposed in the oil sump of a refrigeration compressor so that the base portion is spaced from the bottom of the oil sump. The compressor has a mechanical stirrer which is driven through the sump oil when the compressor is in operation to purposefully agitate the oil in order to create a sound attenuating blanket of foam within the compressor shell. The stirrer is disposed interior of the deturbulator so that the turbulence created by the stirrer in the oil agitation process is localized and contained within the interior of the deturbulator. The bottom of the oil sump, wherein debris normally collects, is therefore shielded from turbulence which would otherwise tend to stir the debris into the oil. The finger-like elements of the deturbulator both act to break up any wave action in the sump oil and to facilitate the production of foam to quiet the compressor.

Abstract: A first portion of a pitot tube-like device faces into the incoming stream of suction gas which enters the hermetic shell of a low-side reciprocating compressor. A second portion of the device extends downwardly toward the oil sump within the shell. The device terminates in a third portion which defines a plurality of apertures and which is immersed in the oil within the sump. The dynamic pressure or velocity head of the incoming suction gas stream is converted within the device to static pressure as a result of the resistance to flow through the device. The resistance to flow through the device is a function of, among other things, the static head at the immersed aperture locations.

Abstract: A hermetic refrigeration compressor has a cylinder block and a crankshaft rotatable about a vertical axis to reciprocate a piston in a cylinder on the cylinder block. A separate bearing housing is secured to the central portion of the cylinder block and extends vertically along the crankshaft, where it carries a pair of roller bearings to journal the crankshaft. The crankshaft has a radially extending flange which is journaled by a thrust-type roller bearing above the bearing housing to absorb the vertical forces on the crankshaft so that all three of the roller bearings are between the crankshaft and the bearing housing to maintain and control the close tolerances required by such bearings.

Abstract: An apparatus for cooling a pressure medium, especially hydraulic fluid, includes a motor-powered pump for conveying the pressure medium and a cooling device includes a fan for the conveying cooling air. In order to permit the cooling device to be mounted on the housing of the pump and/or its drive motor, preferably at the desired point above or below the combined pump and motor, the cooling device is located between columns on the housing of the motor-powered pump and/or on the housing of its drive motor.

Abstract: In a rotary compressor having a motor element and a compression element contained in a sealing case, an oil separating device for separating lubricating oil from an oil-containing refrigerant is attached on the rotor of the motor element. The oil separating device has a circular plate having a diameter substantially equal to the outer diameter of the rotor, wherein a channel-like recess projecting toward the rotor is formed in the circular plate at a position deviated from its central portion; the lower surface of the channel-like recess is adapted to be firmly connected to the upper surface of the rotor, and an aperture is formed at the central portion so that the discharge tube is loosely inserted in the aperture.

Abstract: Housing for a gear motor having an electric motor, an air circulation fan, several gears in a speed reduction gear train, and a low speed output shaft; the housing being manually disassembleable by pivoting an arm locking the three sections of the housing together, shafts for gears and the output shaft all being journaled in two separable sections of the hosuing such that separation of the sections makes the shafts readily disassembleable manually from the housing.

Abstract: A distributor-type fuel injection pump of the type including a magnetic valve disposed on the head portion of a pump body, wherein a pair of oil seals is disposed on opposite sides of the feed pump, and a bypass passage bypasses the cam chamber and connects a discharge side of the feed pump and an inlet side of the magnetic valve. With this construction, the fuel is delivered without passing through the cam chamber. On the other hand, the lubrication oil is introduced into the cam chamber through clearances between the drive shaft and the bearings and through passageways defined in the drive shaft. The cam assembly or other movable components are lubricated exclusively with the lubrication oil, so that the fuel injection pump operates stably over an extended period of time.

Abstract: A device for generating a vacuum comprises a liquid-ring vacuum pump driven by an electric motor and operating with a working fluid. A mixture of compressed air and working fluid from the pump flows to a preseparator which separates a major portion of the working fluid from the gaseous mixture. The separated working fluid is fed from a reservoir in the preseparator via a liquid cooling coil back to the liquid-ring vacuum pump, while the gas still loaded with a residue of the working fluid is fed to a fine separator by means of a gas cooler, working fluid separated in the fine separator being returned to the pump via a return line. The preseparator and the fine separator are physically spaced from one another. The gas cooler and the liquid cooling coil are also physically spaced from one another and are located in the path of the cooling air stream for the electric motor.

Abstract: An oil-sealed rotary vacuum pump includes a pump system and an electric drive motor connected by a drive shaft and located within a housing. The housing is divided by a partition into two separate compartments with the pump system in one compartment and the drive motor in the other compartment. The drive shaft extends through a passage in the partition between the two compartments and the passage is arranged so that any leakage flow is directed from the motor compartment into the pump system compartment.

Abstract: The discharge gas which has been compressed by the compressor main body is cooled by heat dissipation through the heat exchanger, after which it is again returned to the compressor. When the lubricant oil is sucked under pressure of the discharge gas, it is also cooled. Each and every component part of the compressor main body and the electric motor is cooled by causing the cooled discharge gas to pass there through, whereby the temperature rise in the compressor as a whole can be suppressed.

Abstract: A scroll having flow passages constructed so as to provide improved lubricating properties while eliminating excessive consumption of oil. First flow paths have upper ends communicating with a motor chamber formed between the frame of the compressor and an upper portion of the electric motor which drives the compressor, and lower ends which open above an oil pool formed in the lower part of the housing of the compressor. The first flow paths extend in the axial direction of the compressor between the outer wall of the motor and the frame so that all or part of the gas which is sucked into the motor chamber can flow downwardly. Second axially extending flow paths are provided extending in the axial direction of the compressor between the frame and the shell with the gas passing through the first flow paths being caused to change its direction of flow near the lower end of the frame to flow upwardly.

Abstract: A combination fluid tank, air/fluid cooler, and mounting system for the prime mover and pump of a hydraulic power unit comprises a tank having a pair of spaced parallel laterally aligned prime mover and pump mounting plates on opposite walls thereof with a torsion tube connecting the mounting plates. A fan induces a flow of air internally of the torque tube providing for cooling of fluid in the tank. Efficient cooling in combination with a deaerating compartment within the tank minimizes the size of the tank.

Abstract: An oil dispersing device in a compresser having a crankshaft with an axial bore therein. An oil pumping device pumps oil upwardly through the axial bore and outwardly through a radial passage communicating with the bore. A cage bearing located in an upper portion of the compressor housing and journalling the crankshaft has a counterbore formed therein which is coaxial with and surrounds the crankshaft and forms an annulus with the outer surface of the crankshaft. Oil passing outwardly through the radial passage pools in the annulus and deflects additional oil exiting from the passage thereby deflecting oil upwardly onto the upper housing wall whereby the oil is cooled by the compressor housing.

Abstract: A horizontal shaft oil pump is provided for use in a compressor comprising an outer housing having an inlet, an outlet, an oil sump, and a crankcase mounted therein. The crankcase has a generally vertically disposed passageway therein in communication with the oil sump, and a crankshaft is horizontally rotatably received in a bore in the crankcase. A reduced diameter portion of the crankshaft forms between the crankshaft and crankcase an annular chamber in communication with the passageway, and a pair of oppositely angularly disposed helical grooves are disposed in the crankshaft on opposite sides of and in communication with the annular chamber. Upon rotation of the crankshaft, a low pressure area is developed in the annular chamber causing lubricant to be drawn upwardly through the crankcase passageway and into the annular chamber. The rotating helical grooves deliver lubricant from the annular chamber to opposite end portions of the crankshaft for lubricating bearings and other moving parts.

Abstract: A cooling device for a hermetic motor-compressor unit having an outer housing with a lubricant sump in the bottom thereof, a rotatable crankshaft vertically disposed in the housing, and a motor having a stator circumferentially disposed about the rotating crankshaft and a rotor connected to the crankshaft for rotation therewith. The cooling device comprises a pick-up tube connected to the rotating crankshaft and having one end thereof extending into the lubricant sump. The pick-up tube has an axial bore disposed therein and a radial passage means disposed therein in communication with the axial bore so that, upon rotation of the crankshaft, oil is pumped upwardly through the axial bore and a portion thereof thrown radially outwardly through the radial passage means and directly against the inner surfaces of the lower end turns of the stator without having first contacted any other parts of the motor.

Abstract: A motor pump set having two coaxial shafts is provided with a fluid circuit for protecting the rotary packing-gland against any ingress of solid particles such as sand. Pumped fluid is withdrawn from an intermediate space of the pump and returned upstream via a duct within the pump shaft in order to lubricate the bearings as it passes. The fraction of the fluid stream which is discharged from the last bearing flows in the vicinity of the packing-gland and is driven through radial discharge ducts under the action of centrifugal force.

Abstract: A motor-pump unit consists of a screw shaft pump and a slot-barrel motor located on the pressure side of the pump. The motor-pump unit is provided with a rigid, preferably one-piece, shaft by which the motor drives the pump. The motor is located on the pressure chamber of the pump with a bearing between the motor and pump. The shaft is supported within the pump, in part by the bearing, and the rotor of the motor is cantilevered on the free end of the shaft outside the pressure chamber. The pot-shaped stator part of the motor is telescoped over the rotor and fastened directly to the pressure side of the pump.

Abstract: A vertical axis hermetic compressor includes an inner cylindrical housing fixed internally of a sealed outer enclosure bearing paired helical screw rotors defining with the inner housing closed thread compressor compression chambers. An electrical drive motor overlies the rotors and is shaft connected to one of the rotors. Compressed refrigerant vapor, where refrigerant is the working fluid, discharges through the motor rotor. A deflector within the top of the outer enclosure such that oil impacted by gas flow discharging axially from the motor adheres to the deflector to provide oil separation.

Abstract: A vertical motor pump including an upper bearing and a lower bearing located on the motor side for journaling a rotary shaft for rotation at an upper portion and a lower portion respectively of a rotor, at least one of the upper and lower bearings being constituted by a ball bearing. The vertical motor pump further includes a hydrostatic lubricated bearing system for journaling the rotary shaft besides the ball bearing, for bearing a radial thrust during operation.

Abstract: A refrigeration compressor assembly includes a motor compressor mounted within a hermetically sealed shell with a sump area at the bottom containing a lubricating oil. An oil stirrer is secured to the crankshaft below the motor components and includes a hub secured to the crankshaft and a conical, smooth, imperforate skirt extending outwardly and downwardly below the oil surface. The oil stirrer is formed of a plastic insulating material which does not permit the formation of eddy currents within the oil stirrer from the motor flux leakage and whose surface is not wetted by the lubricating oil.

Abstract: A multistage resonant reciprocating compressor having opposed cylinders that are driven by a plunger unit. The plunger unit is suspended between a pair of spaced apart flexure springs and is electrically coupled to a linear motor mounted between the springs. The forces acting on the cylinder piston located on one side of the plunger unit are balanced against the piston forces acting on the other side of the unit and the stiffness of the flexure springs arranged so that the natural frequency of the plunger is at or near the exciting frequency of the motor.

Abstract: A servo pump for use in a hydraulic system. The servo pump is constituted by a variable displacement type hydraulic pump adapted to be driven by a high-speed motor and to hydraulically drive an actuator. The motor and the pump are housed in a common casing. The motor shaft and the pump shaft are integrated to form a common rotary shaft which is supported rotatably at both its ends by end bearings and at its intermediate portion by an intermediate bearing.

Abstract: The motor compressor comprises a hermetic casing in which are mounted a reciprocating compressor and a reversible electric motor having a common vertical shaft with an axial duct for conveying lubricating oil from a centrifugal pump located at the lower end of the shaft to an outlet located at its upper end. The outlet of the axial duct is constituted by an elbow tube which is fixed to the upper end of the shaft and has an inclined end portion extending upwardly and radially outwardly with respect to the axis of the shaft.

Abstract: An improved hermetic motor compressor is disclosed which incorporates an improved discharge muffler arrangement wherein the discharge muffler is intergrated with an end portion of the shell and remote from the driving motor whereby heating of the discharge gas by the motor is substantially eliminated and a relatively large surface area is provided to transfer heat to the surrounding atmosphere. Additionally, the compressor incorporates an improved lubrication system wherein in one embodiment a pressure responsive valved vent is provided for the substantially closed crankcase and operates to create a pressure differential between an oil sump and the upper end of an oil distribution passage thereby improving lubricant flow to the bearings as well as providing means for returning lubricant from the crankcase to the sump. In another embodiment a rotating valved vent is provided which operates to selectively place this upper end of an oil distribution passage in communication with the crankcase.

Abstract: A hermetic refrigerant compressor having an electric motor and compressor assembly in a hermetic shell is cooled by oil which is first cooled in an external cooler 18 and is then delivered through the shell to the top of the motor rotor 24 where most of it is flung radially outwardly within the confined space provided by the cap 50 which channels the flow of most of the oil around the top of the stator 26 and then out to a multiplicity of holes 52 to flow down to the sump and provide further cooling of the motor and compressor. Part of the oil descends internally of the motor to the annular chamber 58 to provide oil cooling of the lower part of the motor, with this oil exiting through vent hole 62 also to the sump. Suction gas with entrained oil and liquid refrigerant therein is delivered to an oil separator 68 from which the suction gas passes by a confined path in pipe 66 to the suction plenum 64 and the separated oil drops from the separator to the sump.

Abstract: A hard vacuum pump of the type having a pump body (4) to which a multi-stage stator (3) and a multi-stage rotor (2) mounted on a shaft (1) are connected, said shaft (1) being driven by a motor and rotating in at least two ball bearings (5, 6) disposed in a sleeve (18) formed by an extension of said pump body (4), a dynamic molecular seal (7) being set on said shaft (1) at the body end of the sleeve (18), wherein the opposite end (11) of the sleeve (18) is closed, a nozzle (8) communicating with an outside source of gas being provided at said closed end (11), said pump body (4) also being connected to an exterior primary vacuum pump whereby said ball bearings (5, 6), and the rotor (9) of said motor are permanently swept by said gas entering via said nozzle and leaving via said dynamic seal, said gas flowing at a pressure intermediate between atmospheric pressure and the pump discharge pressure.The invention is used in microelectronics techniques.

Abstract: A system for conditioning the air of a selected area, e.g. a room, of a house or other building structure, including individual refrigeration units for respectively heating and cooling the room. The respective units are sized according to the heating and cooling loads of the room, and when heating add blower motor and compressor heat and when cooling exclude such extraneous heat.

Abstract: A drive shaft (26) of a gear type fuel pump (2) forms a driving interconnection between an engine gearbox (4) and a shaft (14) which carries the driving gear (10) of the fuel pump. The drive shaft has a slightly diverging lubricant supply passage (65) which receives lubricant from an oil jet (70) in the engine gearbox and directs the lubricant to the engaged splines (44, 46) at the inboard end of the drive shaft. Lubricant from the area of spline engagement is returned to the gearbox via radial passage (78), annular lubricant return passage (68) and radial passage (80). O-ring seals (82, 84) on the drive shaft, which straddle a drain passage (86) prevent the mixing of the lubricant and the fuel which may envelop an intermediate portion of the drive shaft. Wear of the engaged, oil lubricated splines (40, 42) at the outboard end of the drive shaft should provide a general indication of spline wear at the inboard end of the drive shaft because both ends are exposed to similar lubrication.

Abstract: An air compressor including a compressor unit, a drive unit for driving the compressor unit, a sound insulating box having an air inlet and an outlet and encasing the compressor and drive units, a fan positioned in the sound insulating box on the side of the air inlet for suctioning air thereinto, and a duct mounted in the sound insulating box. The duct has at one end opened toward the discharge side of the fan and the other end opened into at least one of the compressor and drive units where cooling is needed.

Abstract: A system for lubricating the main drive shaft bearings in a scroll compressor enclosed within a hermetic shell. The drive shaft and its main bearings are supported in a frame that defines first and second chambers adjacent each end of a main bearing. Each of the chambers includes an opening to a spatial volume contained within the compressor shell. An oil pump at the lower end of the drive shaft supplies oil through a bore in the shaft to a swing link bearing and a thrust bearing, both disposed adjacent its upper end. Oil is dispersed into the spatial volume as a mist of oil droplets by the rotating elements connected to the drive shaft. Fan means are disposed within the second chamber and are operative to develop a differential pressure between the two chambers so that oil droplets are drawn toward the first chamber, lubricating the main bearing as they pass through it.

Abstract: The vertical crankshaft of a hermetic compressor has a longitudinal inner duct for drawing-off oil from the bottom of the hermetic housing. This duct comprises a cylindrical vertical upper duct section which is eccentric relative to the axis of rotation of the shaft, and has its outlet at the upper end of the shaft. At this upper end there is a side outlet passage which comprises a groove made in the upper end face of the shaft and extending from the outlet of the eccentric duct section to the lateral surface of the upper end portion of the shaft in the area in which the outlet and surface are closest together. The bottom of the groove slopes upwards towards the lateral surface.

Abstract: A vertical axis hermetic compressor includes an inner cylindrical housing fixed internally of a sealed outer enclosure bearing paired helical screw rotors defining with the inner housing closed thread compressor compression chambers. An electrical drive motor overlies the rotors and is shaft connected to one of the rotors. Compressed refrigerant vapor, where refrigerant is the working fluid, discharges through the motor rotor. Centrifugal force functions as a primary oil separator for oil entrained within the working fluid. An inverted dish deflector underlies a gas discharge port axially within the top of the outer enclosure such that oil impacted by gas flow discharging axially from the motor adheres to the deflector to provide secondary oil separation while the gas passes about the periphery of the deflector to escape through the discharge opening of the outer enclosure.

Abstract: An electric compressor including a cylinder having a cylinder chamber and inlet and outlet ports opening into the chamber, a piston capable of reciprocating in the chamber and having a first operative face with a first peripheral edge portion inclined at a given angle, a rotating member capable of rotating in the chamber and having an outer peripheral surface capable of opening and closing the inlet and outlet ports, and a second operative face with a second peripheral edge portion inclined at the given angle and capable of being in sliding contact with the first edge portion, the first and second operative face and the peripheral surface of the chamber defining a compression chamber, pushing device for pushing the piston toward the rotating member, and a motor for rotating the rotating member. The inlet and outlet ports are opened and closed and the piston is reciprocated so that gas is sucked into the compression chamber through the inlet port, compressed, and discharged through the outlet port.

Abstract: A direct suction radial compressor having a crankcase therein dividing the compressor into an upper chamber and a lower chamber sealed one from the other, and suction inlet tubing extending through the top portion of the upper chamber for delivering refrigerant to the compressor. A suction chamber is disposed in the crankcase and sealed from the upper chamber and in communication with the suction inlet tubing, and a plurality of radially disposed cylinders are disposed in the crankcase. Positioned between the suction inlet and the cylinders is a centrifuging assembly that separates liquid refrigerant and oil from gaseous refrigerant, and returns the liquids through a unique network of passageways to an oil sump in the lower chamber.

Abstract: A compressor and its external-rotor drive motor are arranged on a common stationary shaft in a unitary housing. On the end of the stationary shaft which is away from the compressor, a friction pump is mounted for pumping lubricant from a supply in the unit housing into an axial canal drilled in the stationary shaft. The impeller of the friction pump consists of a hollow cylinder which is coupled to the external rotor. The hollow cylinder is received in a pump housing which has an annular space between an inner and an outer housing part into which the hollow cylinder extends, forming an inner and an outer gap. The two gaps are in communication with each other and each contains at least one constriction which forces oil carried by rotation of the hollow cylinder past openings in the inner housing into the axial canal.

Abstract: An impeller for a centrifugal oil pump having improved head and flow output capabilities, which impeller can be machined into the end of a crankshaft. A plurality of radially extending tunnels are disposed horizontally in the crankshaft, with outlets in the perimeter of the crankshaft. An annular groove is provided in the crankshaft, with a groove opening in the bottom surface of the crankshaft and a subtending groove surface defining the depth of the groove. The subtending groove surface is normally narrower than the groove opening, and the groove intersects the tunnels, exposing a part of the tunnel walls to a flow of fluid from directly below. The exposed tunnels act as vanes to scoop oil from the groove and accelerate it to crankshaft speed. Entrained gases collect near the subtending groove surface, and a vent passage is provided to conduct the gases out of the impeller.

Abstract: A hermetic refrigeration rotary motor-compressor comprising a hermetically sealed pressure tight housing can enclosing a compressor unit comprising a housing having at least two axially spaced walls and rotatable in relation to the housing piston and cylinder-piston journaled on eccentric portions of two oppositely rotatable shafts. The piston and cylinder-piston form movable walls, and axially spaced walls of the housing form stationary walls of at least two compression chambers. The compressor unit may be operated by any suitable prime mover, preferably an electric motor. An intake charge of refrigerant vapor may cool the motor unit and is admitted into the compression chamber through intake ports and discharged through a system of discharge valves into the discharge line.

Abstract: A hermetic refrigeration rotary motor-compressor comprising a hermetically sealed pressure tight housing can enclosing a compressor unit comprising rotary cylinder-piston and piston elements journaled on eccentrics of two oppositely rotatable shafts, and a motor unit for driving the compressor unit having a rotor mounted on one of the compressor unit shafts, with a stator of the motor unit positioned in operative relation to the rotor of the motor unit. The piston and cylinder-piston form moveable walls, and two axially spaced walls form stationary walls of a compression chamber. An intake charge of refrigerant vapor may cool the motor unit and is admitted into the compression chamber through intake ports and discharged through a system of discharge valves into the discharge line.

Abstract: A centrifugal oil pump for a compressor having improved head and flow performance in which a plurality of tunnels extend radially outward and angularly upward from the face of the impeller and convey oil to the perimeter of the drive shaft during operation. The oil is collected in a chamber of a housing around the bottom of the crankshaft, flows through a channel of an end plate and is transmitted upwardly in a bore of the crankshaft. Entrained gases are vented from each inlet hole to a common annular ring, and through a vent from the annular ring upwardly in the crankshaft.