A scroll compressor is provided. The scroll compressor includes a fixed scroll, an orbiting scroll configured to orbit with respect to the fixed scroll and including an orbiting end plate, and a main frame to which the orbiting scroll is coupled to orbit. The scroll compressor includes a compression chamber in which a refrigerant is compressed by the fixed scroll and the orbiting scroll, and a first back pressure chamber and a second back pressure chamber provided to communicate with the compression chamber. The first back pressure chamber and the compression chamber communicate with each other through a first flow path. The second back pressure chamber and the compression chamber communicate with each other through a second flow path. A different intermediate back pressure is formed in the first back pressure chamber and the second back pressure chamber.

A system includes a compressor housing having an intake portion and a discharge portion and a rotor disposed in the compressor housing and configured to compress a fluid flowing from the intake portion toward the discharge portion. The rotor includes a body portion and an internal passageway formed within the body portion extending along an axial length of the rotor. The internal passageway is configured to direct a lubricant between the intake portion and the discharge portion of the compressor housing.

Disclosed herein is a scroll compressor having a shaft balancer capable of attenuating vibration while preventing deformation of the rotary shaft during operation at a high speed.

A scroll pump includes a first scroll member having a first involute, a second scroll member scroll member having a second involute, and a camshaft rotatably connected to the first scroll member and to the second scroll member. A link is pivotably connected to the first scroll member and the second scroll member. The first and second scroll members cooperate to define a working volume wherein a working fluid is pressurized during operation of the scroll pump. The second scroll member is configured to equalize pressure across first and second opposed surfaces of an end plate thereof. The second scroll member includes a piston and cavity configured to bias the second scroll member toward the first scroll member in response to pressure across the first and second opposed surfaces of the end plate of the second scroll member.

A scroll compressor of an electrical refrigerant drive contains a housing having a low-pressure chamber, a high-pressure chamber, compression chambers and a counter-pressure chamber. A stationary scroll has a base plate and a spiral wall, the base plate of the stationary scroll delimits the high-pressure chamber. A movable scroll has a base plate and a spiral wall which engages into the spiral wall of the stationary scroll and forms the compression chambers with the spiral wall. The base plate of the movable scroll delimits the counter-pressure chamber. A first fluidic connection is provided which connects the counter-pressure chamber to the radially innermost compression chamber, and the first fluidic connection is located in a positioning region of the radially innermost compression chamber between 75° to 195° following the merge angle.

A compressor may include a shell, first and second scrolls, a seal assembly, a modulation control chamber, and a modulation control valve. The first scroll may include a first end plate having a biasing passage extending therethrough. The seal assembly may isolate a discharge pressure region from a suction pressure region. The seal assembly and the first scroll may define an axial biasing chamber therebetween that communicates with the axial biasing chamber and a first pocket between the first and second scrolls. The modulation control chamber may be fluidly coupled with the biasing chamber by a first passage. The modulation control valve may be fluidly coupled with the modulation control chamber by a second passage and movable between a first position allowing communication between the second passage and the suction pressure region and a second position restricting communication between the second passage and the suction pressure region.

An electric compressor includes a housing, a drive shaft, a motor, a movable scroll, and a fixed block. The fixed block is fixed to the housing and disposed between the motor and the movable scroll. The motor includes a stator and a rotor. The rotor has an introduction passage that is formed through the rotor in an axial direction of the drive shaft. The drive shaft includes a balance weight that is disposed between the fixed block and the motor and extends to a position where the balance weight covers at least a part of the introduction passage in a radial direction of the drive shaft in a view in the axial direction. The introduction passage includes a first passage located outward of the balance weight in a circumferential direction of the rotor and the drive shaft, and a second passage facing the balance weight in the axial direction.

A scroll compressor and a method for oil enrichment and distribution, wherein the scroll compressor includes a compressor housing, two scrolls, a respective base plate, an eccentric drive, a drive shaft, an axis of rotation, a balance weight, a first bearing, a second bearing, and a counter-pressure space, and wherein a sealing washer is fixed on the first bearing at a side of the first bearing directed to the cavity of the rotatable balance weight and of the second bearing such that the sealing washer seals the first bearing on one side in a radially outer part of a region between an inner ring and an outer ring through which fluid can flow and is, at the same time, spaced from the inner ring in a radial manner such that a gap through which fluid can flow remains.

According to one embodiment, a rotary shaft of a rotary compressor includes a first connection shaft and a second connection shaft. The first connection shaft has a cross-sectional shape including a first outer surface, a second outer surface, and a third outer surface. L1 represents a distance from an intersecting point located on one end side where the first outer surface and the second outer surface intersect each other to the rotation center, L2 represents a distance from an intersecting point located on an other end side where the first outer surface and the second outer surface intersect each other, to the rotation center, and L3 represents a distance from the third outer surface to the rotation center, a relationship of L1>L3≥L2 is satisfied.

A compressor includes a motor, a balance weight and a partition. The motor includes a rotor having a first end surface and a second end surface. The balance weight is disposed on the first end surface or the second end surface. The partition is disposed on the first end surface or the second end surface. The rotor has a through hole extending from the first end surface to the second end surface. The partition divides, from the through hole, at least one of a front region and a rear region. The front region is located in front of a front edge of the balance weight in a rotational direction of the rotor. The rear region is located behind a rear edge of the balance weight in the rotational direction of the rotor.