Abstract: A multistage compressor installation in which compression stages utilizing centrifugal compressors are independently driven by drivers that can be electric motors configured to be controlled by a speed controller. Intercoolers are located between stages to remove the heat of compression and the stages are connected such that outlets are located opposite to inlets of the compressors and conduits connecting the intercoolers to the stages are in an in-line relationship to inhibit the formation of pressure drops between stages. The conduits connecting the stages incorporate tapered transition sections configured such that flow velocity gradually decreases towards the intercooler and gradually increases from the intercooler to the next succeeding compression stage to further inhibit pressure drops.

Abstract: A reciprocating pump assembly has a pump within a housing. The pump has a crankshaft that rotates and a crosshead that is connected to a plunger via a pony rod. The plunger pumps fluid through cylinders in the pump. A connecting rod connects at one end to the crankshaft and at another end to the crosshead to translate the crankshaft's rotational movement into linear movement of the crosshead and thereby the plunger. The end connected to the crosshead is secured to the crosshead by a bushing located within the crosshead that allows the connecting rod end to pivot during operation. The bushing extends more than 180 degrees, retaining the connecting rod with the crosshead without the need for a wrist pin. The end secured by the bushing can be retained within the bushing by a lock plate, and retainers without the need for a wrist pin.

Abstract: A linear compressor is provided that includes a shell; a fixed member installed inside the shell, and including a cylinder that provides a compression space for a refrigerant introduced into the shell; a moving member including a piston that compresses the refrigerant sucked into the compression space inside the cylinder, and that is linearly reciprocated with respect to the fixed member; and a suction muffler positioned on or in a suction passage of the refrigerant inside the shell. A suction volume with a larger sectional area in a central portion than in both ends is defined in the suction muffler.

Abstract: A fuel system is described that comprises a pressure raising and shut-off valve (PRSOV), and a control valve arrangement operable to control a fuel pressure applied to a part of the PRSOV urging the PRSOV towards a closed position, wherein the control valve arrangement is supplied with fuel at a pressure controlled by a variable fluid pressure potentiometer network including a variable flow restrictor which is variable in response to changes in the position occupied by the PRSOV.

Abstract: An apparatus includes a housing defining a first cavity containing a pump, a second cavity containing a filter and a lumen configured to provide fluid communication between the first cavity and the second cavity. The housing has a first end portion configured to be disposed within a fluid reservoir and a second end portion including a flange configured to be disposed outside of and coupled to the fluid reservoir. A surface of the first end portion defines a first opening in fluid communication with the first cavity. A surface of the second end portion defines a second opening in fluid communication with the second cavity. A cover is configured to be removably coupled to the second end portion of the housing about the second opening such that the filter can be removed from the second cavity when the flange is coupled to the fluid reservoir.

Abstract: A compressor, such as an air-conditioning compressor for motor vehicles, particularly with a drive which has an adjustable swept volume, for the intake and compression of a refrigerant and a lubricant separator, which separates lubricant from the refrigerant, in particular, in the discharge pressure region of the compressor. The lubricant is introduced to the drive by a partial flow branching off from the high pressure refrigerant flow.

Abstract: A pair of dual chamber mixing pumps are combined which allow for a constant dispense rate profile using motor speed modulation. Each pump is divided into two chambers, the proximal chamber and the distal chamber. The chambers are defined in part by a piston having proximal and distal ends and recessed sections. The pump utilizes one common driving mechanism to axially rotate and laterally reciprocate the piston to provide continuous pumping of fluids with reduced pulsations. Each fluid enters through its own pump inlet and outlet. The pumps are operated 90° out of phase with respect to each other.

Abstract: A micropump of peristaltic drive system of pressing a tube having elasticity to transport a fluid is disclosed. The micropump includes: a pump module including the tube, a cam that presses the tube, and a cam shaft on which the cam is pivotally mounted; a drive module including a drive force transmission mechanism that transmits a drive force from a motor to the cam shaft; a coupling member that detachably couples the pump module and the drive module; and a linkage mechanism provided between the motor and the cam shaft to link the drive force.

Abstract: A method for controlling the motor of an air handling system to provide a desired output of flowing air therefrom while minimizing the power used by the motor, including operationally connecting a switched reluctance electric motor to a blower, operationally connecting an electronic controller to the switched reluctance electric motor, operationally connecting at least one sensor to the electronic controller, measuring at least one environmental parameter with the at least one sensor, inputting the desired air flow into the electronic controller, calculating the minimum motor speed necessary to provide the desired air flow, and sending a control signal from the electronic controller to the motor to control the motor to the minimum motor speed necessary to provide the desired air flow.

Abstract: A common regulator valve is provided for a variable displacement pump fuel metering scheme in which the common regulator valve both controls working output to a pump actuator to control displacement of the variable displacement pump and also to control bypass of excess fuel flow. The regulator valve also includes a differential piston which generates a compensation force off of the bypass flow in order to compensate for changes in spring force and flow reaction force at different system pressures and operational states. As a result, errors in the metered fuel flow can be either eliminated or substantially reduced.

Abstract: A closure bottom plate 1 for electric pump 100, in particular for a boiler circulation centrifugal pump, is made of a cup-shaped motor cover 2 and a connector-holder cover 3. The bottom plate 1 has an internal aeration path 4, intended to allow the circulation—by natural convection—of air which is heated during the operation of the electric pump 100 preventing the formation of condensate inside the bottom plate 1. The internal aeration path 4 is extended between at least one inlet opening 22 arranged on the motor cover 2 and an outlet opening 36, successively crossing the internal volume of the motor cover 2, the coupling opening 21, and a labyrinth 32 defined by the connector-holder cover 3.

Abstract: Embodiments of the present invention are directed to method and devices for measuring the pressure of a pump chamber in which no internal opening or connections are needed. One embodiment of the present invention is directed to an apparatus for pumping fluid. The apparatus comprises at least one housing having a transducer surface. The transducer surface has a thickness exhibiting measurable deformation upon the chamber holding a fluid under pressure such that the transducer surface has a first position at which the chamber is at one pressure and a second position at which the chamber is at a second pressure. A strain sensor is affixed to the transducer surface producing; at least one signal upon the transducer surface assuming the first position and at least one signal upon the transducer surface assuming the second position to function as an integrated pressure transducer.

Abstract: It is an object of the present invention to provide a portable vacuum carrying system comprising an ion pump (6) comprising a casing (1), a positive electrode (2) provided in the casing (1), a negative electrode (3) fixed to the inner wall of the casing (1) and located on the circumference of the positive electrode (2), magnets (4) placed so as to surround the circumference of the negative electrode (3), and a connection part (5) for connecting the casing (1) to other devices.

Abstract: A restraint system (300, 300?, 500) for a vaned diffuser (225) of a turbocharger (100) or other fluid boosting device is provided that can reduce or eliminate losses. The system (300, 300?, 500) uses a structure to provide both a pressure load on the vaned diffuser (225) and a seal for the vaned diffuser (225). The structure can be a fluoroelastomer O-ring (350, 350?, 550). The O-ring (350, 350?, 550) can be positioned at least partially in a channel (325, 325?, 525) formed in at least one of the diffuser ring (206, 206?), the compressor housing (103) and the center housing (102).

Abstract: An exemplary pump includes a pump housing defining a pump cavity, a movable pumping member situated in the pump cavity, and at least one pressure-absorbing member located inside the pump housing. The housing also has an inlet and an outlet, and includes at least one interior non-wearing location that contacts liquid in the pump housing when the pump housing is primed with the liquid. The movable pumping member, when driven to move, urges flow of the liquid from the inlet through the pump cavity to the outlet. The at least one pressure-absorbing member is located inside the pump housing at the non-wearing location and contacts the liquid. The pressure-absorbing member has a compliant property to exhibit a volumetric compression when subjected to a pressure increase in the liquid contacting the pressure-absorbing member, the volumetric compression being sufficient to alleviate at least a portion of the pressure increase.

Abstract: The peristaltic pump of the invention incorporates at least one pumping roller and one occluding roller. The occluding roller is located diametrically across the pumping roller and is designed to provide occlusion only and not progressive squeezing of the pump tubing while rotating in the same direction as the pumping roller. Such occlusion prevents back-flow through the tubing. More than two rollers spaced evenly along the periphery of the rotor allow for various useful combinations of pumping and occluding rollers. Two occluding and one pumping roller combination creates a pulsatile flow close to that of a human heart—with systole being about twice shorter than diastole.

Abstract: A pneumatically operated reciprocating pump comprises two opposed pumping chambers, in each one of which a respective flexible bellow slides under the control of a pneumatically operated shuttle valve capable to alternatively let a gaseous fluid in one of the two chambers for expanding the respective flexible bellow, each one of the two chambers being connected to at least one respective suction valve and to at least one respective delivery valve. Each delivery valve is provided with a compensating elastic means capable to compensate variations of rate of fluid that is pumped by the respective chamber. The pneumatically operated shuttle valve comprises a shaped spool sliding between two limit positions within a perforated cylinder, which shuttle valve is connected, for each chamber, to one or more delivery ducts and to one or more ducts for respectively letting and discharging gaseous fluid in and from the respective chamber.

Abstract: Various embodiments of the invention provide a screw compressor for compressing a refrigerant in a refrigeration system. The screw compressor includes a rotor case, which accommodates a primary helical rotor that is intermeshed with at least one secondary helical rotor, to compress the refrigerant in the rotor case. The rotor case also includes a slide valve supporting member that is fixed on an inner wall of the rotor case. Moreover, a slide valve, located in the rotor case, slides axially on the slide valve supporting member. The slide valve controls the volume of refrigerant during compression. The slide valve is fitted with at least one internal pressure relief valve, to relieve internal pressure in the screw compressor.

Abstract: A process for sizing an axial length of a throat in a jet pump, where an exponential relationship between mixing and kinetic energy dissipation of the primary jet is plotted in terms of a non-dimensional parameter on a graph which ranges from around 1.0 at an axial length of zero to a ratio of less than 0.1 at the minimal axial length of the throat to produce complete mixing between the primary and secondary fluids. This non-dimensional parameter is referred to as the Stein number.

Abstract: A variable displacement pump includes: a pump body; a rotor; a cam ring; inlet and outlet ports; first and second fluid pressure chambers; a metering orifice provided in a discharge passage connected with the outlet port; a pressure regulating section arranged to regulate the pressure introduced into the first or second fluid pressure chamber, and including a high pressure chamber, a middle pressure chamber, and a low pressure chamber; a relief valve; a pilot orifice provided in a passage connecting the metering orifice and the middle pressure chamber, and having a circular section with a diameter of a mm; and a damper orifice provided in a passage connecting the outlet port and the high pressure chamber, and having a circular section with a diameter of b mm. The pilot orifice and the damper orifice satisfy the following relationships: a+2b?2.1?0, ?4a+b?16.3?0, and a?1.8.