Abstract: A multistage ejector is provided for generating a vacuum from a source of compressed air. The compressed air is passed through a series of nozzles, which entrains air so as to form a jet flow in two or more stages and generating a vacuum across each stage. The ejector outlet is formed as a nozzle extending to the outlet end of the ejector and arranged to receive the jet flow from the final stage of the ejector. The ejector outlet nozzle includes a diverging section extending at an angle of divergence to the direction of airflow, the diverging section terminating in a stepwise expansion in the cross-sectional flow area, as viewed in a direction perpendicular to the direction of airflow through the ejector outlet nozzle.

Abstract: An electric water pump having a motor with an axially moveable rotor unit. A rotary pump member is fixed for axial movement with the rotor unit to vary its position within a pump chamber so as to vary the flow rate through the pump chamber.

Abstract: A pump head has a motor coupler; a motor mount; at least one piston housing; a fluid input; a fluid output; and a reciprocating piston to pump a fluid from fluid input to fluid output. The manifold has fluid input and output bores extending parallel with the reciprocating piston, and from end to end thereof. The motor mount has a mounting flange configured to couple to a motor, and a torsion sleeve extending from the flange. A torsion bolt is coupled with the piston housing. An elastomeric sleeve isolates the torsion bolt from torsion sleeve. The torsion bolt longitudinally compresses and radially expands the elastomeric sleeve toward and against the torsion sleeve. The reciprocating piston, piston housing, a first seal, and a second seal in combination define a fluid collection chamber for fluid that leaks past the first seal. A fluid conduit connects the fluid collection chamber to the fluid input.

Abstract: A vertical pump has a motor support for arranging between a lower pump assembly and an upper motor assembly in relation to a vertical pump axis. The motor support features a base plate for coupling to the lower pump assembly; a mounting plate for coupling to the upper motor assembly; and at least three pairs of truss elements connected between the base plate and the mounting plate and oriented obliquely in relation to the vertical pump axis, each pair having respective truss elements with converging ends coupled to one of the base plate or mounting plate at a substantially common point and with diverging ends coupled to the other of the base plate or mounting plate at different points.

Abstract: The hydraulic piston (1) constitutes a hydraulic chamber (5) with a cylinder (4) and has a cylindrical body (6) connected—from the side of the chamber (5)—by a link-stop valve (3) to a cooling and lubricating gasket valve (2) which is passed right through by a flow calibration opening (27), the valve (2) being able to move in longitudinal translation over a short stroke with respect to the body (6) or to be held at a distance from the body (6) by the valve link-stop (3), a valve return spring (30) tending to move the valve (2) away from the cylindrical body (6).

Abstract: A linear compressor is provided that may include a shell having a cylindrical shape, a compressor main body inserted into the shell, a first shell cover coupled to a rear end of the shell, a first support coupled to a front end of the compressor main body that supports the front end of the compressor main body, and a second support that couples a rear end of the compressor main body to the first shell cover and supports the rear end of the compressor main body. The first support may include a support head coupled to a center of the front end of the compressor main body, and a pair of dampers having both ends respectively coupled to the support head and an inner circumferential surface of the shell.

Abstract: A method for actuating a semi-controlled valve that acts in synchronism with the compression cycles of an alternative compressor, and a system for actuating a multi-suction alternative compressor semi-controlled valve. The method for actuating the semi-controlled valve involves detecting at least one compression peak in the course of at least one mechanical cycle of the alternative compressor and switching the functional status of at least an alternative compressor semi-controlled valve based on the detection.

Abstract: A reciprocating piston of a positive displacement pump has a piston body with a plurality of cooling fins on one or more exterior surfaces of the piston body. A seal coupled to the piston body forms a seal with the walls of a cylinder in the positive displacement pump. A rod moves the piston within the cylinder to cause the displacement of fluid.

Abstract: A compressor includes a compression mechanism configured to suck and compress a refrigerant from a suction space to discharge the refrigerant to a discharge space by a driving force transmitted thereto. The compressor includes an oil storage chamber provided in the discharge space to collect oil separated from the refrigerant discharged from the compression mechanism, an oil recovery passage configured to guide the oil in the oil storage chamber to the suction space, and a decompression mechanism provided in the oil recovery passage to reduce a pressure of the oil passing through the oil recovery passage by an orifice hole having an inner diameter smaller than the oil recovery passage. The decompression mechanism is configured such that, when a pressure in the oil storage chamber is increased, the inner diameter of the orifice hole is reduced.

Abstract: A plunger pump fluid end assembly design in which the suction valve and seat is aligned with the plunger and the fluid end housing is constructed with multiple modules. Modules are held in a rigid assembly by staybolts that connect to the power end of the plunger pump. Said staybolts pass though bores in the central fluid module and the suction seat module and bound by a conventional threaded nut. Packing box modules are bound to the central fluid module by bolts that also pass through separate bores in the same central module. A suction valve spring retainer/plunger spacer within the plunger bore of the assembly shields the intersection of the plunger bore and the discharge bore from destructive erosion damage.

Abstract: A hot swappable fan module includes an outer frame, a cooling fan, a fixing element, and a light guide assembly. The cooling fan is located on one side of the outer frame. The fixing element is operable to fix the outer frame and the cooling fan. The light guide assembly includes a light guide post, a first stopping portion, and a second stopping portion. The light guide post penetrates through the cooling fan and the outer frame. The first stopping portion is located on the light guide post, and abuts against one surface of the cooling fan opposite to the outer frame. The second stopping portion is arranged opposite to the first stopping portion, is light-transmittable, and is optically coupled to the light guide post, and abuts against one surface of the outer frame opposite to the cooling fan.

Abstract: A centrifugal blower apparatus includes a scroll-shaped housing with first and second air inlets which open to a blower chamber that is in fluid communication with an air outlet. The blower includes a motor to drive impellers, wherein the motor is secured to a frame coupled within the housing in a manner to substantially enhance aerodynamic performance of the blower.

Abstract: A reduced-pressure device includes a housing having recesses on sidewalls thereof, an air pressure storage unit and a compression unit. The air pressure storage unit is installed in the housing and comprises a pressure storage container, a piston assembly and a piston spring, and the compression unit is mounted on the piston assembly. The compression unit further includes a pressing element and a turntable. The pressing element is accommodatable in the recesses of the housing, and rotatable by the turntable in relative to the air pressure storage unit and the housing, and when the pressing element is pulled out of the recesses and rotated to a predetermined position to compress the piston assembly to produce a negative pressure in the pressure storage container, the pressing element can be rotated back to the original position to be accommodated in the recesses again after using.

Abstract: In a sealed compressor (100) of the present invention, a valve plate (150) is provided with a plurality of discharge holes (151a, 151b) and a plurality of discharge valves (171a, 171b) which open and close the plurality of discharge holes. A tip end surface (160a) of a piston (160) is provided with a plurality of convex portions (161a, 161b), at least tip end portions of which are located inside of the discharge holes (151a, 151b) in a state in which the piston (160) is located at a top dead center.

Abstract: An exemplary heat pump (10) includes: a compressor (16A, 16B) that discharges refrigerant; an oil separator (30) that separates oil from the refrigerant discharged from the compressor; an oil return channel (80) that returns the oil separated by the oil separator to the compressor; a pressure sensor (86A, 86B) that detects a pressure in the oil return channel; a first pressure loss member (84A, 84B) and a second pressure loss member (88A, 88B) disposed in portions of the oil return channel at an oil separator side and a compressor side relative to the pressure sensor; and a control device that increases an output of the compressor in a case where a pressure detected by the pressure sensor exceeds a suction pressure of the compressor and less than a discharge pressure of the compressor.

Abstract: A refrigeration system with two or more compressors configured to compress a flow of refrigerant with oil entrained therein. A suction flow piping arrangement is configured to supply a flow of refrigerant and oil to the two or more compressors. The suction flow piping arrangement has a suction header configured to carry the flow of refrigerant and oil, and a primary compressor supply conduit connected to the suction header. The primary compressor supply conduit supplies refrigerant and oil to a first compressor of the two or more compressors. A secondary compressor supply conduit branches off from the suction header. The secondary compressor supply conduit supplies refrigerant to a second compressor of the two or more compressors. The primary compressor supply conduit is configured to supply more oil to the first compressor than the secondary compressor supply conduit supplies to the second compressor.

Abstract: A cryogenic fluid pump includes an outlet tube extending along the pump centerline, the outlet tube having an outlet passage that is fluidly in communication with the combined outlet and with a pump outlet opening, and a shroud that extends concentrically along the outlet tube and has an inner diameter that is larger than an outer diameter of the outlet tube such that a gap is formed in a radial direction between an inner surface of the shroud and an outer surface of the outlet tube, the gap extending along at least a portion of the outlet tube.

Abstract: An axleless blade set includes an annular frame and a driving structure. The driving structure serves to drive the annular frame. Blades extend from an inner wall of the annular frame and an outer wall of the annular frame is formed with a plurality of driving sheets. The driving structure serves to drive the driving sheets so as to drive the annular frame and the blades therein to rotate. As a result, wind blows from one side to another side along an axial direction with a large strength. Therefore defects of wind blowing from prior art fans of low strength and dispersing randomly are resolved.

Abstract: A method of controlling a motor of a ventilator of a heat exchanger, the method includes detecting a starting behavior of the motor, detecting a starting obstacle of the motor, setting the starting behavior of the motor in accordance with a predefined scheme of correction, and setting at least one of a torque of the motor is set and a direction of rotation of the motor is set, and the direction of the motor being reversed.

Abstract: An apparatus and method, the apparatus comprising: a microfluidic channel (3); an electromechanical gel (5) provided within the microfluidic channel (3); at least one pair of electrodes (7) wherein the at least one pair of electrodes (7) are configured to control the electric field across the microfluidic channel (3) to cause the electromechanical gel (5) to deform in response to a voltage applied to the electrodes (7) such that the deformation enables fluid to be pumped through the microfluidic channel (3).