Abstract: A hermetic compressor includes a sealed casing which accommodates therein a compressing unit for compressing a refrigerant and a driving unit for driving the compressing unit. A communication passage is provided for establishing communication between the compressing unit and a discharge muffler. The discharge muffler is formed therein with a substantially annular hermetic passage for the compressed refrigerant introduced via the communication passage. In the substantially annular hermetic passage, the introduced compressed refrigerant is bifurcated in opposite directions. The substantially annular hermetic passage has an outlet in the discharge muffler. At the outlet, the bifurcated refrigerant joins and flows out of the substantially annular hermetic passage so as to reduce pressure pulsation of the compressed refrigerant by canceling pressure pulsation components contained in the bifurcated refrigerant.

Abstract: A compact, easy-to-handle turbo vacuum pump includes a housing having an inlet port and an outlet port; a cylindrical rotor disposed in the housing and having a stepped peripheral surface and a plurality of blades secured to protruding corners of the steps; and a pumping mechanism portion in which a pumping stage is formed by a stator which faces the blades of the rotor across a narrow gap, and in which peripheral pump flow paths are provided in step-like recessions inside the stator. The turbo vacuum pump further includes a rotating shaft which is connected to the rotor and is rotatably supported by a radial gas bearing and a thrust gas bearing; and a motor portion for operating the rotor. Gas sucked in through the inlet port can be discharged into the atmosphere through the outlet port.

Abstract: A noise suppressor for hermetic compressors comprises a one piece elongate damper element twisted in the form of a helix, with adjustable pitch for the noise frequency band that one wishes to damp. The damper element is designed to be inserted in a gas passage duct of small hermetic refrigeration compressors, for the purpose of reducing the noise emitted by the compressor, by the opening and closing movements of the suction valve and by the flow of refrigerant gas.

Abstract: An improved positive displacement pumping system uses a pair of pumps operating in opposition to one another to provide continuous and constant volumetric flow at a constant predetermined pressure.

Abstract: Methods and devices for enhancing bootstrap hydraulic systems for use in vehicular power steering systems are disclosed. Improved pressure dividing networks are provided for enabling balanced operation of supply pressure control function when valve input shaft and sleeve are in relative centered positions or for enabling a first method of providing speed sensitive control of steering assist. Control valves utilizing a combination of open-center and closed-center flow control orifices are provided for reducing parasitic pressure losses. An improved variable displacement pump is provided for enabling volumetric flow rate efficient operation of bootstrap systems. A vehicular speed dependent command signal for a servo motor powered bootstrap hydraulic system is utilized in another method of providing speed sensitive control of steering assist.

Abstract: A refrigerant suction and discharge apparatus for a hermetic compressor includes a suction pipe drawing refrigerant from the exterior of the hermetic compressor, a suction muffler having a hollow cavity at one side and, another side, an intake opening provides a communication into a suction chamber, and at least two guide pipes positioned adjacent to the outlet opening of the suction pipe to refrigerant gas from the suction pipe gas into the suction muffler.

Abstract: A peristaltic pump includes a panel member having a rotatably driven rotor with roller elements on it, two projections which each have insert-receiving slots, two cover-supporting slots each extending away from a respective projection, and an orientation tab disposed between the projections. A one-piece insert has a platelike portion with ends slidably received in the insert-receiving slots, a recess which receives the orientation tab, and two pairs of aligned projections on opposite sides thereof, the insert further including a flexible tube extending around the rotor and having its ends engaging respective projections on one side of the platelike portion. A cover member is removably supported on the panel member by flanges which slidably engage the cover-receiving slots and by locking surfaces thereon which engage locking surfaces on the projections, the cover member including a curved surface adjacent and facing the roller elements on the rotor, and serving as a cover for the tube and rotor.

Abstract: A liquid refrigerant pump includes a housing having a hollow interior for receiving liquid refrigerant, a motor disposed within the interior of the housing and connected to a source of power, a rotatable pump member disposed within the interior of the housing and a shaft interconnecting the motor and pump member for rotating the pump member to increase the pressure of the liquid refrigerant upon the motor receiving electrical power.

Abstract: Pump apparatus for an evaporative cooler includes an impeller housing sealed on its top wall by a closed cell foam element and a bearing and seal element. The impeller housing has only one water inlet and one water outlet. The sealing of the impeller housing allows the level of the water in which the pump is disposed to be substantially lower than with prior art pumps, and substantially eliminates air intake into the impeller housing except through the one water inlet. Water outflow is only through the impeller housing outlet. Two embodiments are illustrated.

Abstract: The invention provides a series of bi-directional aseptic volume filler cylinders, that are able to provide measured volume fillers as the piston is driven in both directions by providing an aseptic disk value which is able to direct material in the desired directions. Both sides of the chamber are able to draw material from a single passage and output material to a single passage.

Abstract: A pumper system is adapted to enable pumps to be switched between parallel operation, for the high flow conditions normally desired for in-situ pigging operations within a line to be cleaned, and series operation, for the high pressure conditions needed in the event the pigging device becomes obstructed in the line.

Abstract: The specification describes several uses for pressure sensitive valves during extracorporeal pumping in one embodiment, an improved pumping loop for a roller pump is used in an extracorporeal circuit with a pressure relief valve and pump tubing. The inlet and outlet of the tubing are connected respectively to the outlet and inlet of said valve via two 3 way connections, across the outlet of the pump. The pumping loop allows recirculation of pumped liquid between the inlet and outlet of the pump when the outlet pressure generated by said pump exceeds a set value thereby limiting the pump outlet pressure to the set pressure. The pressure relief valve can also be placed at the inlet if the pump to protect the circuit from excess negative pressure that the pump can generate. The pressure relief valve in combination with the pump loop provides an accurate means to dynamically set the occlusion of the tubing within the roller pump.

Abstract: A peristaltic pump tube holder has a body having first and second pump tube connectors extending outside of it. The pump tube connectors extend at an acute angle relative to a surface of the body to receive a flexible tubing loop and orient the tubing loop for engagement with an external peristaltic pump rotor.

Abstract: An electro-pneumatic blower having an electric motor drive and a set of centrifugal blower blade and a set of compressed air turbine blades, both sets being an integral part of a single blower turbine wheel which is mounted on the shaft of the motor. A preferred embodiment is a 30 pound portable unit which which has been tested at flows of 250 CFM at 6.6 inches water gage pressure rise when driven by a 0.5 HP, 3600 RPM electric motor. The blower provides flows of 375 CFM at 13 inches water gage pressure when driven by a compressed air turbine at 80 psig. The compressed air turbine blades in this embodiment are cast along with the blower blades as parts of a single blower-turbine wheel.

Abstract: An overload protection device for a drive motor of a pressure generator is provided including an auxiliary pump, flow resistance devices, and a pressure-controlled valve. The drive motor drives the main pump of the pressure generator, whose output flow rate is stabilized by a hydraulic regulating valve, which senses the pressure of the output flow of the main pump. The auxiliary pump is also driven by the drive motor and generates an output flow rate proportional to the rotational speed of the drive motor. An auxiliary hydraulic circuit, including the first and second flow resistance devices connected in series, connects the auxiliary pump to the tank of the hydraulic pressure generator. The pressure-controlled valve includes a control chamber connected with a tapping point in the auxiliary hydraulic circuit for sensing the output flow of the auxiliary pump.

Abstract: An infusion pump for regulating fluid flow through the flow path of an IV tubing set for intravenous administration to a patient. The pumping mechanism of the infusion pump comprises a reversible motor having a drive shaft with a wheel mounted thereon. A valve is provided which is adapted for reversibly closing the flow path through the IV tubing set, and a swing arm is provided. The swing arm has a wheel-engaging portion adapted for engaging the wheel, and an actuator portion operatively linked with the valve to actuate the valve. The arrangement is such that, when the motor is turning the drive shaft in a first direction, the swing arm is moved towards a first position where the actuator portion allows the valve to move to its open position to open the flow path. When the motor is reversed to turn the drive shaft in a second direction opposite the first direction, the swing arm is moved to a second position where the actuator portion moves the valve to its closed position to close the flow path.

Abstract: A swash plate is mounted on a drive shaft disposed in a housing having a gas suction chamber in such a way that the swash plate is rotatable integrally with the drive shaft. A plurality of cylinder bores are formed around the drive shaft, extending along the drive shaft. Disposed in each cylinder bore is a piston, which reciprocates between top and bottom dead centers by undulating movement of the swash plate caused by rotation of the drive shaft. A compression chamber where gas is compressed by the reciprocal movement of the piston is defined in each cylinder bore. Provided between the drive shaft and the swash plate is a mechanism for altering an angle of the swash plate with respect to the axis of the drive shaft to change a reciprocal stroke of the piston to thereby control compression displacement. A rotary valve is provided at the drive shaft to be rotatable integrally with the drive shaft.

Abstract: A submersible pump support including at least one pump housing, a first pump support rail extending in a first plane coupled to and supporting the at least one pump housing, a second pump support rail extending in the first direction in the first plane coupled to and supporting the at least one pump housing, wherein a distance of the at least one pump housing from the first plane is no more than one half a distance, in the first plane, between the first and second pump support rails.

Abstract: A pneumatic fan containing a revolving wheel, which has a circumference, first and second stepped fillets at both axial ends thereof, and a rotary main shaft extending from the stepped fillets. The circumference is provided with a plurality of axially extending slots. The pneumatic fan further contains a plurality of impellers which are slidably received by the axially extending slots, each of the axially extending slots having a depth greater than the height of the impellers. Two shaft bearing seats are provided to receive the rotary main shaft at two axial ends thereof. The revolving wheel including the impellers are enclosed in a cylindrical motor seat having an entrance port for receiving air and an exit port for exiting air. The revolving wheel is disposed eccentrically relative to the motor seat, and the motor seat and the rotary main shaft have a point of contact, such that the entrance port and the exit port are disposed equidistantly from, and at opposite sides of, the point of contact.

Abstract: Pumping action is performed by a unitary, sealed, easily replaceable pumping element, comprising a housing with a longitudinal axis, a pumping chamber at one end of the housing, an outlet in a wall of the pumping chamber, an inlet in the housing, axially spaced from the pumping chamber, and a circulator in the pumping chamber, mounted on a support which is free of the rotating elements, and which provides freedom of motion for the circulator to revolve in an orbital path about the longitudinal axis. Magnetic means external to the housing drive the circulator in its orbital path by magnetic action through the walls of the housing. The orbital circulator contains a magnetic element and is driven in a circular path by an external rotating magnetic field.