An oil pump includes a pump component, a valve container, a valve mechanism, and a circumvention passage. The valve container includes a through hole establishing communication between an inside and an outside of the valve container. The valve mechanism includes: a valve body contained in the valve container; a valve element contained movably in the valve body; a back pressure chamber disposed to face a first valve end of the valve element; a drive mechanism disposed to face a second valve end of the valve element and structured to generate a drive force to move the valve element; and an aperture positioned higher in a vertical direction than the through hole and formed in the valve body so as to establish communication between the back pressure chamber and the inside of the valve container. The circumvention passage establishes communication between the through hole and the aperture.

There is disclosed a scroll compressor according to the present disclosure in which a discharge port is formed at a central portion thereof, and a pair of two compression chambers continuously moving toward the discharge port are formed, and a plurality of bypass portions are formed at each interval along a movement path of each compression chamber in the both compression chambers, and compression gradients of the both compression chambers are formed to be different from each other, wherein when an interval between a bypass portion closest to the discharge port and another bypass portion adjacent to the bypass portion among the bypass portions of each compression chamber is defined as a first interval, respectively, a first interval of a second bypass portion belonging to a compression chamber having a relatively larger compression gradient is formed to be smaller than that of a first bypass portion belonging to the other compression chamber between the both compressor chambers.

There is disclosed a scroll compressor according to the present disclosure in which a discharge port is formed at a central portion thereof, and a pair of two compression chambers continuously moving toward the discharge port are formed, and a plurality of bypass portions are formed at each interval along a movement path of each compression chamber in the both compression chambers, and compression gradients of the both compression chambers are formed to be different from each other, wherein when an interval between a bypass portion closest to the discharge port and another bypass portion adjacent to the bypass portion among the bypass portions of each compression chamber is defined as a first interval, respectively, a first interval of a second bypass portion belonging to a compression chamber having a relatively larger compression gradient is formed to be smaller than that of a first bypass portion belonging to the other compression chamber between the both compressor chambers.

A fluid pumping system for a vehicle having an internal combustion engine comprises a housing, an electric motor, a rotatable first input adapted to be driven by the internal combustion engine, a rotatable second input driven by the electric motor, and a pump. The pump includes a drum selectively rotated about a drum axis of rotation by one of the first input and the second input, and a pump rotor selectively rotated by the other of the first input and the second input. The drum includes a cam ring having a cavity in receipt of the pump rotor. The drum includes a first fluid inlet port and a second fluid inlet port on opposite sides of the drum such that fluid entering the cavity through the first and second fluid ports flows axially in a direction parallel to the drum axis of rotation. The drum includes a radially extending outlet port such that pumped fluid flows radially out of the cavity. The housing contains the electric motor and the pump.

A vane pump includes: a suction port configured to guide working oil to a pump chambers; a discharge port configured to guide the working oil discharged from the pump chambers; and a notch formed from an opening edge portion of the suction port towards a reversing direction of a rotation direction of a rotor, wherein the pump chambers each communicates with the suction port through the notch during a course of the transition from the state, in which the pump chamber is in communication with the discharge port, to the state, in which the communication with the discharge port is shut off, as the rotor is rotated.

The present disclosure describes a rotary pulsation generator having a simple structure capable of transferring fluid while implementing low noise and low vibration and having high flow of fluid and high pressure suction and discharge functions. According to the present disclosure, fluid is transferred by adjusting a width and interval of pulsation while reducing vibration caused by eccentric rotation of a rotor.

The present invention provides A motor comprising: a shaft; a rotor including a hole in which the shaft is disposed; and a stator outside the rotor, wherein the rotor comprises a rotor core and a magnet, wherein the rotor core comprises: a main body; a pocket which is formed in the main body and in which the magnet is disposed; first barriers extending from both sides of the pocket; and second barriers formed between an inner circumferential surface of the main body and an outer circumferential surface of the main body, wherein a center (C11) of the second barrier has a certain arrangement angle (θ) in a circumferential direction from a first line (L11) passing through a center (CC) of the main body and a center of a width (W) of the magnet.

A flange for a pump comprises first and second faces and a passageway for cryogenic fluid flow extending from the first face to the second face and at least one of (1) the passageway is for a pipe and comprises a first portion of a first diameter and a second portion of a second diameter greater than the first diameter, wherein when the pipe has an outer diameter that is smaller than the second diameter a gap is formed between the pipe and the passageway where the pipe passes through the second portion; and (2) a first annular groove in one of the first face and the second face and extending around the passageway, wherein the first annular groove in cooperation with the passageway forms a bellows. The gap and bellows increase the thermal resistance between the passageway and the flange, and the bellows allows for flexure during thermal contractions of the flange reducing thermal stress on welded fluid seals.

A flange for a pump comprises first and second faces and a passageway for cryogenic fluid flow extending from the first face to the second face and at least one of (1) the passageway is for a pipe and comprises a first portion of a first diameter and a second portion of a second diameter greater than the first diameter, wherein when the pipe has an outer diameter that is smaller than the second diameter a gap is formed between the pipe and the passageway where the pipe passes through the second portion; and (2) a first annular groove in one of the first face and the second face and extending around the passageway, wherein the first annular groove in cooperation with the passageway forms a bellows. The gap and bellows increase the thermal resistance between the passageway and the flange, and the bellows allows for flexure during thermal contractions of the flange reducing thermal stress on welded fluid seals.

A fluid working system such as a pump for displacing a working fluid such as hydraulic fluid or a motor using a working fluid is provided. The system may have a positive displacement machine which includes one or more working chamber with displacement means such as a cylinder with a reciprocating piston. There are also two or more fluid ports to allow the working fluid to flow into and out of the working chamber. The working fluid flows from one fluid port means to another either being forced to do so when pumped or moving the piston when functioning as an engine. The fluid working system has associated therewith a non-dead compliance volume of a material such as syntactic foam. This compliance volume acts to smooth any pressure fluctuations within the working fluid system.