Abstract: A compressor includes: a plurality of terminals; a terminal cover protecting the plurality of terminals; a temperature sensor configured to detect a temperature of a shell; and a cover having a flat portion disposed around the plurality of terminals, and a sensor protection portion covering the temperature sensor, the sensor protection portion being integrally formed with the flat portion to extend from the flat portion. The terminal cover is attached to cover the flat portion of the cover in a state in which the temperature sensor disposed on the shell is covered by the sensor protection portion of the cover. Thus, it is possible to prevent a lead wire of the temperature sensor from being accidentally cut when the terminal cover is attached.

Abstract: A compressor of an embodiment includes three suction pipes. A first center of a first suction pipe, a second center of a second suction pipe, and a third center of a third suction pipe are positioned at vertices of a triangle. A first distance between the first center and a center of a compressor main body is smaller than a second distance between the second center and the center of the compressor main body and a third distance between the third center and the center of the compressor main body. The first suction pipe is connected to a first suction port on an uppermost side. A second virtual plane on which a central axis of a main curved pipe part of the second suction pipe is disposed and a third virtual plane on which a central axis of a main curved pipe part of the third suction pipe is disposed are inclined to opposite sides from each other with respect to a first virtual plane on which a central axis of a main curved pipe part of the first suction pipe is disposed.

Abstract: The present disclosure relates to a compressor having a first rotor and a second rotor disposed within a housing, where the first rotor is configured to rotate about a first axis of the housing and the second rotor is configured to rotate about a second axis of the housing. The first rotor and the second rotor engage with one another such that rotation of the first rotor and the second rotor pressurizes a vapor within the housing. The compressor includes an end plate coupled to a discharge end of the housing, where the end plate includes a variable opening configured to discharge a flow of the vapor from the housing. The end plate also includes a first movable member and a second movable member that are configured to increase or decrease a cross-sectional area of the variable opening to adjust the flow of the vapor.

Abstract: A system and technique for determining functionality of a hydraulic system including first and second motors mutually coupled in driving relation with a pump, a sensor generating a signal representative of a monitored condition, and a controller configured to selectively control activation and deactivation of the motors. Fitness detection logic stored in memory of the controller is executable by a processor to: determine, based on the signal while the first motor is activated and second motor is deactivated during a first test interval, whether the monitored condition meets a predefined threshold prior to expiration of the first test interval; determine, based on the signal while the second motor is activated and first motor is deactivated during a second test interval, whether the monitored condition meets the predefined threshold prior to expiration of the second test interval; and generate a readiness signal representative of the determined functionality of the hydraulic system.

Abstract: A method for operating a pressure control system having a multistage compressor includes outputting, by the multistage compressor in order to fill a pressure medium store or pressure medium chambers of the pressure control system, a pressure medium compressed multiple times. Outputting the pressure medium compressed multiple times includes providing, by a first compression stage, a precompressed pressure medium and further compressing, by a second compression stage, the precompressed pressure medium to form a compressed pressure medium and then outputting the compressed pressure medium. Alternatively, outputting the pressure medium compressed multiple times includes providing a compression pressure medium, which is obtained from additional compression of an already compressed charge pressure medium from the pressure medium reservoir or the pressure medium chambers of the pressure control system, wherein the compression pressure medium is output without additional compression by the second compression stage.

Abstract: Provided is a pumping system that includes a parallel dual chamber pumping mechanism and an attachable disposable cassette. The disposable cassette may include a multi-laminate membrane, which facilitates efficient, accurate and uniform delivery of fluids. The membrane can be held in intimate contact with the pumping fingers of the pumping mechanism by electrostatic or magnetic attraction, thereby allowing the pump to pull a vacuum without the need for a preloaded elastomeric pumping segment.

Abstract: A pump assembly with a pump unit comprising an impeller for pumping fluid, an electric motor for driving the impeller, a control module for controlling the speed of the electric motor in a control mode, and an interface for receiving a pulse width modulated (PWM) control signal with a duty cycle indicative of the speed of the electric motor. The control module is configured to interpret the PWM control signal at start-up of the electric motor per default in a configuration mode as a configuration bit sequence based on the duty cycle of the PWM control signal during a pre-determined configuration window.

Abstract: A pump for a microfluidic device is disclosed. The pump comprises an actuator and a resilient isolator which is a planar, layered structure. The resilient isolator may comprise a support layer and optionally other layers for strengthening against tensile stress imposed by bending. Alternatively or in addition, the resilient isolator may comprise a plurality of annular regions, layers of the resilient isolator being configured such that at least one of the plurality of annular regions is less resistant than another one of the plurality of annular regions to bending. The actuator may comprise a piezoelectric disc including a surface which comprises electrode regions for electrical connection with respective conductive regions of a conductive layer of the resilient isolator, and an alignment feature for rotational alignment of the piezoelectric disc to ensure the electrical connection between the electrode regions and the respective conductive regions.

Abstract: A working control device comprises an operation lever for making a boom cylinder (36), an arm cylinder (37) and others work to drive a shovel apparatus (30), and a delivered oil amount control device (a controller (150)). A working oil supply source includes a first electric motor (M1) and a first hydraulic pump (P1). When the operation lever is subjected to a single operation, a number of the motor revolution based on the lever operation is set to control the first electric motor. When the number of motor revolution is less than a necessary minimum number of revolutions, the necessary minimum number is set to control the first electric motor (M1). When the operation lever is subjected to a composite operation, a total number of motor revolutions based on the lever operations is set. When the total number is less than a necessary minimum number of revolutions, the necessary minimum number is set to control the first electric motor (M1).

Abstract: An electric oil pump includes a motor including a motor shaft, a pump assembly including a vane pump driven by the motor to suction and discharge oil, and an inverter to drive the motor. The motor includes a rotor, a stator on a side outward from the rotor in a radial direction, and a motor housing containing the rotor and the stator. The motor housing includes a suction port through which the vane pump suctions oil from outside, and a discharge port through which the vane pump discharges oil to outside. The motor housing includes flat surface portions in a portion of an outer periphery thereof. The suction port and the discharge port are located in a first surface of side surfaces which are the flat surface portions of the motor housing and are parallel or substantially parallel to the axial direction.

Abstract: A multi-stage electric gas pump includes a driving mechanism and an eccentric shaft including a main body having a longitudinal axis, a first eccentric portion, and a second eccentric portion, wherein the first eccentric portion and the second eccentric portion are fixed on the main body. The eccentric shaft is driven by the driving mechanism to produce a first circular movement of the first eccentric portion around the longitudinal axis and a second circular movement of the second eccentric portion around the longitudinal axis, wherein the second circular movement is synchronized with the first circular movement. The multi-stage electric gas pump further includes a first cylinder, a second cylinder, and a third cylinder. The cylinders in three stages are driven by the eccentric shaft so as to achieve three-stage pressurization of gas.

Abstract: A fluid end assembly of a hydraulic fluid pump includes a housing, a plug member, a lock cover, and at least one retention pin. The housing may include at least one bore. The plug member may be positioned at least partially within the at least one bore. The lock cover may be coupled to the housing and configured to retain the plug member within the at least one bore during operation of the fluid end assembly. The at least one retention pin may extend at least partially through a portion of the lock cover to retain the lock cover in a rotational position that retains the plug member at least partially within the bore.

Abstract: An example system includes a fluid end having a block, a fluid inlet formed in the block, and a fluid outlet formed in the block. The system also includes an intake manifold fluidly coupled to the fluid inlet, and a fluid conduit fluidly coupled to the fluid outlet and the intake manifold. The system further includes a valve fluidly coupled to the fluid conduit, the valve configured to control fluid flow through the fluid conduit, an actuator coupled to the valve and configured to position the valve in an open position or a closed position, and a controller communicatively coupled to the actuator and configured to send one or more signals to the actuator, causing the actuator to position the valve in the open position or the closed position.

Abstract: An operating method for a conveying device with an eccentric screw pump for conveying viscous construction materials comprising sensing a pressure of the construction material at an outlet of the eccentric screw pump when the eccentric screw pump is running and automatically switching off the eccentric screw pump if the pressure exceeds an upper limit value, otherwise continued operation of the eccentric screw pump. The method includes sensing a characteristic variable of the running eccentric screw pump and comparison of the characteristic variable with a first comparison variable, which is characteristic of operation with an open dispensing device and/or with a second comparison variable, which is characteristic of operation with a closed dispensing device, and switching off the eccentric screw pump if operation with a closed dispensing device is detected, otherwise continued operation of the eccentric screw pump.

Abstract: Embodiments of the present disclosure provide a flow control valve, an oil pump assembly having the flow control valve, and a scroll compressor. The flow control valve includes: a valve body having an inlet configured for a fluid to flow into the valve body and an outlet configured for the fluid to flow out of the valve body; a passage provided between the inlet and the outlet and extending in a predetermined direction, an area of a cross section of the passage perpendicular to the predetermined direction being negatively correlated with a distance from the cross section to the inlet; a valve element slidably provided in the passage, a flow area between the valve element and an inner wall of the passage is negatively correlated with the distance from the valve element to the inlet; and an elastic member provided in the valve body to apply an elastic force on the valve element so as to move the valve element in a direction toward the inlet.

Abstract: A fixture has a body that connects to a motor, the body having a bore. The body has a piston in the bore, separating the bore into a pressure chamber and a lubricant chamber in fluid communication with lubricant in the motor. A technician applies pressure to the pressure chamber, which causes the piston to increase pressure of the lubricant in the lubricant chamber and in the motor. The technician monitors a distance of movement of the piston, indicating a presence of residual air in the lubricant. If the movement meets a amount, the technician applies a vacuum to the lubricant chamber and bleeds out residual air from the lubricant in the motor.

Abstract: Systems and methods are disclosed for reducing pulsations in peristaltic pumps. In some examples, a cassette comprises a cassette body and a flexible sheet joined to the cassette body, wherein a transition region of the flexible sheet comprises at least one ridge that has a maximum height at a position that is offset from a center line of a cassette body transition channel. In some examples, a cassette body transition channel comprises side walls that taper toward an active region of the fluid path and/or toward a bottom of the transition channel. An example method of operating a peristaltic pump comprises operating rollers at a higher speed during portions of a revolution that otherwise would result in a lower than average flow rate and at a lower speed during portions of the revolution that otherwise would result in a higher than average flow rate.

Abstract: A retainer nut assembly for a fluid end of a pump system includes a fastener with a generally cylindrical configuration, first and second ends, external threads configured to engage corresponding threads of a fluid end block, and a cavity formed at the first end. A suction cap is configured to sealingly fit to the fluid end block. A load piston is movably disposed in the cavity adjacent the suction cap. A bore is formed through the fastener in communication with the cavity and provided with hydraulic fluid. A pressure piston is movably disposed in the bore. A threaded passageway is formed through the fastener in communication with the bore and open to the second end. A locking bolt is disposed in the threaded passageway and, when inserted into the threaded passageway, contacts the pressure piston and generates fluid pressure on the load piston.

Abstract: A retainer nut assembly for a fluid end of a pump system includes a plug with two blades separated by edge cuts, a plug exterior face and a threaded rod extending from the plug exterior face. Each of the blades includes an arcuate face. A mid-cap includes a hole for receiving the threaded rod therethrough with the mid-cap positioned adjacent the plug. The mid-cap further includes flange segments. A cover cap includes a hole for receiving the threaded rod therethrough with the cover cap positioned adjacent the mid-cap. The cover cap has extensions separated by cut outs. Each of the extensions are configured to extend axially between respective flange segments of the mid-cap when the cover cap is assembled to the mid-cap. A fastener engages the threaded rod and secures the retainer nut assembly together.

Abstract: A pump system contains a vibration actuator which can be electromagnetically driven by applying an alternating-current voltage E thereto, a sealed chamber connected to a suction port and a discharge port, and a movable wall for changing a volume of the sealed chamber. The movable wall is displaced due to drive of the vibration actuator to supply fluid in the sealed chamber into a target object. The pump system controls an effective value of the alternating-current voltage E so that an amplitude Y of the vibration actuator is constant.