The disclosure herein relates to device, for example a gear pump, for pumping fluid. The gear pump comprises a motor for driving a rotatable drive shaft; a drive gear configured to be driven by the drive shaft; an idler gear which meshes with the drive gear; an annular magnet disposed coaxially with the drive shaft and configured to rotate therewith; and a sensor for sensing rotation of the annular magnet and generating an output signal corresponding to a rotational position of the drive shaft.

A compressor may include a casing; an electric motor provided in the casing and that operates a rotational shaft; and a compression device. A flow path guide may be installed between the electric motor and the compression device, and may separate a refrigerant flow path from an oil flow path. The flow path guide may have a first partition wall and a second partition wall which are spaced apart from each other. In addition, the flow path guide may have an oil discharge port formed in at least a section of the flow path guide along a circumferential direction thereof, the oil discharge port allowing a guide space between the first partition wall and the second partition wall to be open toward the inner surface of the casing.

A compressor and an air conditioning system. The compressor includes a low-pressure-stage compressor body and a high-pressure-stage compressor body, where the low-pressure-stage compressor body is provided with a low-pressure-stage suction port and a low-pressure-stage exhaust port, the high-pressure-stage compressor body is provided with a high-pressure-stage suction port and a high-pressure-stage exhaust port, a communication pipeline is arranged between the low-pressure-stage exhaust port and the high-pressure-stage suction port, the low-pressure-stage suction port communicates with a low-pressure-stage gas source, and the high-pressure-stage suction port has a first state of communication with the low-pressure-stage exhaust port and a second state of communication with the low-pressure-stage gas source.

The present disclosure relates to a scroll compressor and its lubricating oil supply system. The lubricating oil supply system includes: an oil passage P.sub.1 formed by a core hole extending longitudinally through the crankshaft; an oil pump, whose oil suction port is immersed in the lubricating oil in the oil pool, and the oil outlet is connected to the oil circuit P.sub.1; an oil passage P.sub.3 located in the gap between the upper end surface of the crankshaft and the lower surface of the orbiting scroll; an oil passage P.sub.4 formed by a longitudinal hole in the crankshaft, the longitudinal hole extending downwards from the upper end surface of the crankshaft; an oil passage P.sub.5 formed by a transverse hole in the crankshaft and a gap between the lower edge of the hub of the orbiting scroll and the upper surface of the upper counterweight, the transverse hole extending transversely from the outer peripheral surface of the upper end of the crankshaft to communicate with the longitudinal hole, the opening of the transverse hole on the outer peripheral surface of the upper end of the crankshaft is aligned with the gap between the lower edge of the hub and the upper surface of the upper counterweight; an oil passage P.sub.6 formed by the gap between the outer peripheral surface of the hub and the upright wall of the upper counterweight, and the gap between the outer peripheral surface of the hub and the inner peripheral surface of the center hole of the housing; and an oil passage P.sub.2 formed by an oil return pipe so that the lubricating oil circulates.

A motor-driven compressor with a housing and an electric motor includes a stator that includes a stator core including a yoke and teeth, an insulator including an insulator base in contact with an end face of the yoke, and three-phase windings, each being wound around the corresponding teeth in a concentrated manner so as to form coils. The winding of each phase forms connection wires locked on an outer circumferential surface of the insulator base. Each connection wire connects adjacent coils of the corresponding phase. The outer circumferential surface includes a locking surface including accommodation grooves, each accommodating the corresponding connection wire, and a non-locking surface that does not lock the connection wires. The stator core includes an engagement recess that engages with part of a jig. The engagement recess is located radially outward from the insulator base on the end face and located radially outward from the non-locking surface.

A scroll compressor includes a casing, a scroll compression mechanism, a motor, a crankshaft, a bearing, a frame fixed to the casing; and an oil separation member fixed to the frame. The motor includes a stator and a rotor rotatable in a rotational direction. The bearing rotatably supports the crankshaft. The oil separation member suppresses mixing of a refrigerant and a lubricating oil. The frame supports the bearing and has first and second fixed legs fixed to the casing. The oil separation member has a first horizontal and inclined surfaces. The first inclined surface has a first inclined surface upstream portion and a first inclined surface downstream portion. The first inclined surface downstream portion is disposed higher than the first inclined surface upstream portion. The first horizontal surface, the first inclined surface, and the first fixed leg are disposed in order from upstream to downstream in the rotational direction.

A scroll compressor of an air conditioner includes a refrigerant discharge tube through which refrigerant discharged to an inner space of a casing is discharged into a refrigeration cycle, a venturi tube disposed adjacent to the refrigerant discharge tube in the inner space of the casing, and a liquid refrigerant discharge tube having a first end connected to the venturi tube and a second end opposite to the first end and communicating with the inner space of the casing at a lower side of the refrigerant discharge tube, where liquid refrigerant can be suppressed from excessively stagnating in the inner space of the casing.

The invention relates to an orbital pump for pumping a fluid, wherein the pump comprises at least one pump control system, a motor that can be controlled by the pump control system, a rotor shaft (10) for fluid transport, and a rotor sensor for detecting an absolute angle of rotation of the rotor shaft (40), the rotor sensor is connected to the pump control system and designed to transmit the angle of rotation of the rotor shaft (40) to the pump control system, and the pump control system is designed to rotationally control the rotor shaft (40) by means of the motor until the rotor shaft (40) is in a pre-determined angle of rotation position.

A split power gerotor pump includes a rotational axis, a shaft, an inner gerotor, an eccentric pocket, and an outer gerotor. The inner gerotor is rotationally fixed on the shaft, rotatable about the rotational axis, and includes n first lobes. The eccentric pocket is rotatable about the rotational axis, and includes a cylindrical bore with a center radially offset from the rotational axis and an outer surface, disposed radially outside of the cylindrical bore and arranged for direct engagement with a gear or a rotor for an electric motor. The outer gerotor includes a cylindrical outer surface installed in the cylindrical bore and n+1 second lobes.

The present invention includes a phase angle detection unit generating a phase angle signal switched at a timing at which a cogging torque generated with the rotation of a rotor of a brushless DC motor reaches near a peak on a negative side hindering the rotation of the rotor, an inverter circuit energizing coils of respective phases of the brushless DC motor by switching elements according to an input of a driving signal, an energization period calculation unit calculating an energization period Tw from a target rotation speed set for the brushless DC motor, and a drive control unit energizing the coils sequentially by outputting the driving signal to the respective switching elements for each energization period, gradually increasing a duty of the driving signals to the switching elements at a start of each energization period, and decreasing the duty after the phase angle signal is switched.