A rotary compressor is provided that may include a rotational shaft, first and second bearings configured to support the rotational shaft in a radial direction, a cylinder disposed between the first and second bearings to form a compression space, a rotor disposed in the compression space to form a contact point forming a predetermined gap with the cylinder and coupled to the rotational shaft to compress a refrigerant as the rotor rotates, and at least one vane slidably inserted into the rotor, the at least one each vane coming into contact with an inner peripheral surface of the cylinder to separate the compression space into a plurality of regions. The at least one vane may include a pin that extends upward or downward, and a lower surface of the first bearing or an upper surface of the second bearing may include a rail groove into which the pin may be inserted.

An oil-free scroll air compressor, includes two fixed scrolls and a movable scroll with scroll wraps on both sides. The fixed scrolls each are provided on an end surface thereof with scroll wraps. The movable scroll with scroll wraps on both sides is provided on both end surfaces thereof with scroll wraps. The two fixed scrolls and the movable scroll with scroll wraps on both sides together form two gas compression channels located on two sides. The scroll warps on a same end surface are configured as a double-parallel-groove structure, which further divides the gas compression channel on the same side into two gas compression channels, thereby increasing displacement of the scroll air compressor. After a gas is introduced through a gas inlet on a circumferential surface of the fixed scroll, the gas is compressed in multiple compression channels and then discharged from a center of the scroll air compressor.

A multi-stage rotary vane pump comprising at least two rotor elements. The rotor elements are supported by a rotor shaft. The rotor elements and the rotor shaft are in the form of a single piece.

An outer gear and an inner gear expand and contract volume of pump chambers formed between both the gears, and rotate to suction fuel into the pump chambers and then discharge fuel from the pump chambers sequentially. The inner gear includes an insertion hole that is depressed along its axial direction. A joint member includes a main body portion that is fitted to a rotary shaft, a foot portion that extends from the main body portion along the axial direction and is inserted in the insertion hole with a clearance therebetween, and a protruding portion that protrudes from the foot portion toward a rotation progress side of the inner gear and has its width in the axial direction further narrowed toward a top portion of the protruding portion.

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 rotary compressor of an embodiment has a rotating shaft, an electric motor, a compression mechanism, a balancer, and a balancer cover. The compression mechanism has a cylinder, a main bearing, and a sub-bearing. The balancer is provided on the rotating shaft on a second side of the sub-bearing in an axial direction thereof. The balancer cover covers the balancer. A lubricating oil supply path that opens on a second side end face in the axial direction is provided in the rotating shaft. A supply hole that allows the supply path to communicate with the outside of the balancer cover is formed in the balancer cover at a position facing the supply path in the axial direction. A seal mechanism that seals between the balancer cover and the rotating shaft is provided between the balancer cover and the rotating shaft while allowing relative movement between the balancer cover and the rotating shaft in the axial direction.

A rotary pump is presented for use in a medicament delivery device, where the pump has a back plate having an inner surface and a rotor housing is positioned adjacent to the back plate having a peripheral wall. A front plate support is connected to the back plate and a flexible front plate is positioned between the front plate support and the rotor housing. The pump is rotated using a planetary gear transmission, where an eccentric shaft is operatively connected to the planetary gear mechanism. A rotor is rotationally fixed to the eccentric shaft and movably positioned within the rotor housing. The rotor has three lobes, where each lobe has two peripheral curved surfaces sharing a common apex, where a first portion of each peripheral surface adjacent to the apex defines a non-smooth curve.

A rotary cylinder piston compressor pump is provided, including a rotating shaft (2), a piston (3) and a cylinder (4). A rotating shaft hole (21) is provided in the rotating shaft (2). An oil guiding channel, provided in the cylinder (4), communicating with the rotating shaft hole (21). A recess (45) is formed in the inner end face of the cylinder (4). An oil path (61) sealed relative to a compression cavity (49) of the cylinder (4) is formed between the recess (45) and the piston (3). The oil path (61) between the recess (45) and the piston (3) is communicated with an oil path (62) between the piston (3) and the rotating shaft (2) and is communicated with the oil guiding channel by means of an oil returning channel. Also provided is a compressor including the compressor pump.

The present disclosure provides a multi-stage compressor and an air conditioner having the same. The multi-stage compressor includes: a first-stage cylinder including a first-stage compression cavity and a first vane disposed in the first-stage compression cavity; a second-stage cylinder including a second-stage compression cavity and a second vane disposed in the second-stage compression cavity, wherein a refrigerant flowing out from the first-stage compression cavity enters the second-stage compression cavity; a linkage structure disposed between the first vane and the second vane, so that the second vane is capable of moving with a movement of the first vane and maintain contact with a roller in the second-stage compression cavity.

Disclosed herein is an integrated pump system in which a motor is directly coupled to a pump, preferably using a modular connection. The integrated pump system may operate in a uni-directional or bi-directional mode. The integrated pump system incorporates an internal cooling channel which directs the returning low pressure hydraulic fluid past the controller and the motor for cooling purposes. The low pressure hydraulic fluid is also directly fed into the coupling between the motor and the pump to provide both cooling and lubrication.