Abstract: An infusion system having a pumping mechanism with tube-engaging members for pumping fluid through a tube, a releasable pressure plate that can be attached and detached from the pumping mechanism having a releasable attachment mechanism for attaching an infusion tube to the pressure plate such that the infusion tube can be engaged by the tube-engaging members when the pressure plate is attached to the pumping mechanism, and an infusion tube for delivering fluid from a fluid source to a patient that is arranged and configured to be attached to the pressure plate by the attachment mechanism and used with the pumping mechanism. The infusion tube can be quickly replaced by detaching the infusion tube from the releasable attachment mechanism and attaching a new infusion tube to the pressure plate.

Abstract: A water system includes a reciprocating pump operated by pedal power. The pumpstand includes a housing in which a foot pedal and a drive shaft rotate. An eccentric pin, rotating with the drive shaft, moves a connecting rod, which in turn causes a pushrod to oscillate vertically. The pushrod extends into a pressure-tight chamber formed above the rising main (wellpipe). A pumprod connected to the pushrod extends to move a conventional plunger through vertical oscillations. A flywheel is attached to the drive shaft, and a counterweight is mounted on the flywheel diametrically opposite the eccentric pin. The radial distance from the drive shaft to the counterweight can be adjusted. A discharge pipe extends from the pressure-tight chamber to an elevated or pressurized storage tank. A distribution pipe from the storage tank feeds water to a number of distribution points, such as faucets in houses.

Abstract: A linear compressor includes a casing, and a cylinder member suspended by springs from the casing. The cylinder member forms a compression chamber in which a piston is reciprocated by a linear motor. The motor includes a first stator situated inside of the piston, and a second stator situated opposite the first stator outside of the piston. The cylinder member comprises spaced apart first and second cylinder blocks with the second stator clamped therebetween. The first cylinder block contains the compression chamber, and the second cylinder block carries a hollow guide extending into the piston, with the first stator mounted on an outer surface of the guide. The piston includes an axial shaft reciprocally guided within the hollow guide. The piston carries a first magnet. A coil disposed between the first and second stators generates a magnetic field passing across the magnet to cause the piston to reciprocate.

Abstract: A compact getter pump, compatible with size limitations of portable apparatus is described. In one embodiment a getter device and a heating apparatus capable of heating getter elements to a desired temperature, are contained within a thermally insulating housing comprised of a plurality of nested thermally insulating shields with an open end. The open end of at least one of the shields is covered with a particle trap. In another embodiment, each of the nested thermally insulating shields is of a substantially cylindrical shape and is substantially coaxially disposed along an axis defined by the heating apparatus. In one embodiment a plurality of getter elements and a heating apparatus are enclosed by three nested evenly spaced cylindrical metal shields that have open ends and are coaxially disposed along an axis defined by the getter elements and the heating apparatus.

Abstract: An electromechanical transducer drives a resonator plate, which develops oscillating pressure in a contacting liquid. A high-speed check valve rectifies the pressure oscillations, causing pumping. On the driver side of the valve, the high inertial flow impedance in a narrow passageway confines oscillating pressure while admitting non-oscillating fluid flow. On the valve side opposite the driver, a volumetric compliance element decouples the inertia of the fluid passageway to permit fast acceleration and deceleration of fluid pulsing through the valve. A high-speed passive check valve consists of a thin-section o-ring covering a circular slot, with circumferential tension setting the forward bias pressure. Pump frequencies above one kilohertz and microliter stroke volumes are practical. Electrical impedance measurements on the pump indicate fluid volume in the pump.

Abstract: A variable capacity single-headed piston type compressor having a cylinder block defining therein a plurality of cylinder bores in which single-headed pistons are reciprocated so as to compress refrigerant gas in response to a rotation of rotation-to-reciprocation converting unit arranged in a crank shaft defined by the cylinder block and a front housing hermetically attached to a front end of the cylinder block, the crank chamber being provided with a suction gas inlet port formed so as to open into the crank chamber, a rear housing hermetically attached to a rear end of the cylinder block and defining a suction chamber for the refrigerant gas before compression and a discharge chamber for the refrigerant gas after compression, the suction chamber being in fluid communication with the crank chamber so as to receive the refrigerant gas from the crank chamber via a fluid passageway for the suction of the refrigerant gas, and a flow regulating valve arranged in the fluid passageway to adjustably change the cros

Abstract: In a compressor there is a hermetic case (1) having a high pressure gas outlet (1a) that houses a cylinder block (3) defining a gas suction chamber (7) and a gas discharge chamber (8). A main gas discharge tube (9) has an inlet end (9a) in fluid communication with the gas discharge chamber (8) and an outlet end (9b) communicating the gas discharge chamber (8) with the gas outlet (1a) of the case. At least one gas discharge auxiliary tube (10) is provided with an inlet end (11) receiving gas from the discharge chamber (8) and an outlet end (12) to provide the gas to the gas stream flowing in the main gas discharge tube.

Abstract: An oil pump apparatus incorporates, an oil pump housing, and a rotor located in the oil pump housing, wherein the rotor forms a first set of pockets having a capacity increasing toward the rotating direction of the rotor and a second set of pockets having a capacity decreasing toward the rotating direction of the rotor. The apparatus further includes a plurality of suction ports connected with the first set of pockets, each of the suction ports being isolated from other adjacent suction ports, a discharge port connected with the second set of the pockets, and a control valve.

Abstract: A pumping system in accordance with the invention comprises n (n.gtoreq.1) piston or diaphragm primary pumping modules (P1 to Pn) including each at least one pumping unit, connected by means of unidirectional valves (V11-V1n) respectively to n tanks (R1-Rn) containing fluids, a collecting head (CH) receiving the fluids delivered by the various primary modules, and a secondary piston pumping unit (S) for discharging the mixture of fluids collected in this head with a substantially constant flow rate. The pistons are shifted alternately for example by the translation motion of endless screws (9) driven by motors (12). A control set (17-20) associated with position detectors (AC1-ACn) and pressure detectors (C1 to Cn, Cs) proportion the fluids injected and adjust the phases, the piston strokes and their velocities in order to obtain a substantially constant discharge rate. Each primary module can also comprise a second pumping module also allowing a constant rate to be obtained during the suction phase.

Abstract: A variable displacement swash plate type compressor has a coupling structure between a drive shaft and a swash plate in order to allow the swash plate to be movable along the drive shaft and inclinable relative to the same. The coupling structure comprises a bearing portion provided on the drive shaft to rotate therewith. The bearing portion includes first and second semicylindrical outer walls which are symmetrically arranged with respect to an axis of the drive shaft and first and second flat side walls which are symmetrically arranged with respect to the axis. Each of the first and second semicylindrical outer walls is perpendicular to each of the first and second flat side walls. The bearing portion further includes a rectangular center bore formed in a hub portion of the swash plate. The center bore is so sized and shaped as to intimately and slidably receive therein the bearing portion.

Abstract: A method and a pumping system for lifting formation fluids from a production zone in a wellbore which allows the pump unit to be retrieved through the production tubing while leaving the tubing, electrical cable, and the remainder of the components of the pumping system in place. A pump unit is retrievably positioned within the production tubing and is releasably connected to a downhole motor whereby the motor will drive the pump when electricity is supplied thereto through the cable secured to the tubing. This allows the pump unit to be both retrieved and installed through the tubing without removing the production tubing string, the motor, or the electrical cable from the wellbore.

Abstract: The peristaltic pump includes a motor and an assembly driven by the motor. The assembly includes a rotating member, a retaining member having a slot, and a tubing advance pad sized to be substantially disposed in the slot, wherein in a first time interval the tubing advance pad is substantially disposed in the slot and the rotating member is configured to compress a tube along a path defined by the retaining member and at least a portion of the tubing advance pad, and in a second time interval the retaining member is configured to release the tubing advance pad from the slot, the tubing advance pad is coupled to the rotating member and the tube is prepared to advance from a first position to a second position.

Abstract: A method and apparatus for evacuating a vacuum system which includes an evacuating portion comprising first and second vacuum pumps which are connected in series. The method and the apparatus are characterized in that the first vacuum pump is operated in a range from reverse rotation to forward rotation, and the second vacuum pump is rotated unidirectionally, thereby enabling pressure control of the vacuum system over a wide range.

Abstract: The invention relates to a peristaltic pump system. The pump system comprises both an insert (10) and a motor assembly (30). The insert essentially comprises a wall (16) and a duct (22) of deformable material. The motor assembly comprises a drive shaft (38), a plate (50) on which rotary means (54, 64) are mounted to guide wheels (48) suitable for co-operating with the duct (22). When the shaft (38) is inserted, the wheels (48) are spread outwards and compress the duct (22) between themselves and the wall (16) of the insert.

Abstract: A scroll-type machine is disclosed which is particularly well suited for use as a compressor in refrigeration and air conditioning systems and incorporates a unique arrangement for modulating the capacity thereof. In one group of embodiments the capacity of the scroll-type machine is modulated by relative axial movement between the scroll members so as to form a leakage path across the wrap tips and opposed end plates. In another group of embodiments, modulation is achieved by reducing the orbital radius of one of the scroll members to thereby form a leakage path across the flank surfaces of the wraps. Both types of scroll separation may be accomplished in a time pulsed manner to thereby enable a full range of modulation with the duration of the loading and unloading periods being selected to maximize the efficiency of the overall system.

Abstract: A process and apparatus for controlling a rotary screw compressor capacity mechanism by manual pneumatic means. The apparatus compromises a specially placed rotary type cartridge valve enclosed in a valve body and housing. The assembly is attached via a flexible coupling to a rotating indicator rod that follows internal movement of the compressor's capacity piston mechanism. Manual movement of the assembly body opens valve ports that pneumatically position the compressor's internal capacity piston.

Abstract: A compressor with a compressing device compresses gas containing oil mist. The compressing device includes a compression chamber. A receiving chamber receives the compressed gas discharged from the compression chamber. The receiving chamber has a duct for discharging the gas from the receiving chamber. A hollow cylinder communicates with the duct and projects inside the receiving chamber. The gas directed toward the duct flows around the cylinder to generate centrifugal force for separating the oil mist from the gas.

Abstract: A hydraulic axial piston motor is disclosed, having a rotatable cylinder drum, in which several work pistons, each provided at one end with a slider shoe, are arranged in work cylinders so as to be axially movable, having a control plate, a swash plate, against which the slider shoes bear, a pressure plate which holds the slider shoes on the swash plate, and a pressure-applying unit, which acts on the pressure plate and comprises a hydraulic piston-cylinder arrangement. Using such a motor it is desirable for an adequate contact pressure to be produced using simple means. For that purpose, the piston-cylinder arrangement is arranged between the cylinder drum and the control plate.

Abstract: A hydraulic unit having a hollow oil container which has a receiving space for oil between an external outer wall and an internal outer wall, and having a pump unit which comprises an electric motor and a pump which can be driven by the electric motor. Such a hydraulic unit is to be further developed in such a manner that it has only a low noise level, in which connection also sufficient cooling of the hydraulic fluid and of the electric motor should be assured. This is achieved in the manner that at least the pump, and preferably the pump unit, is included in an enclosure which is formed by the hollow oil container and at least one sound-damping element.

Abstract: A pump assembly which includes a prop head which is driven by a rotor that is located in a housing to which the pump head is attached. The pump head includes a drive gear and a driven gear. The drive gear is coupled to the rotor by a shaft which is received at opposite ends by a bearing located in a closed end of the rotor housing and a bearing which is located in the pump head.