A compressor may include first and second scroll members having first and second scroll wraps, respectively. The scroll members define a suction inlet, a discharge outlet, and fluid pockets moving therebetween. The second scroll member may include a port, and a passage. The port may be in fluid communication with at least one of the pockets. The passage may extend through a portion of the second end plate and may be in fluid communication with the port. A valve assembly may be disposed in the passage and may include a valve member displaceable between open and closed positions. A recompression volume may be disposed between the valve member and the at least one of the pockets. The recompression volume may be less than or equal to approximately one percent of a volume of one of the pockets at a suction seal-off position.

A compressor includes a container provided with an oil reservoir which is provided at a bottom portion of the container to allow oil to be collected in the oil reservoir. The container is provided such that a rotary shaft is inclined relative to the direction of gravity or to be laid horizontal. In the container, an electric motor mechanism, the rotary shaft, a compression mechanism and a frame which fixes the compression mechanism to the container are provided. To the container, a suction pipe is connected to cause refrigerant to flow into space between the frame and the electric motor mechanism. In the frame, a suction port is formed to cause the refrigerant having flowed into the space to flow into the compression mechanism, and each of the suction portion and a connection port of the suction pipe, which connects with the container is located at a position which is higher than or the same as the level of the rotary shaft as seen in a rotation axial direction. A rib is formed in a first flow passage which extends downwards in the direction of gravity from the connection port, extends through an area located above the oil reservoir, and reaches the suction port.

An Oldham coupling includes an annular ring having a first side and a second side opposite to the first side, a first and a second engaging groove that are diametrically opposed and located on the first side, and a third and a fourth engaging groove that are diametrically opposed and located on the second side. The first and second engaging grooves are configured to be engaged with a first and a second engaging projection provided on a fixed element. The third and fourth engaging grooves are configured to be engaged with a third and a fourth engaging projection provided on an orbiting scroll. The first and third engaging grooves are located in a first angular sector, and the second and fourth engaging grooves are located in a second diametrically opposed angular sector of the annular ring, the first and second angular sectors have an opening angle less than 40.

A compressor includes a bore, a rotor disposed within the bore, a compressor inlet, a compressor outlet and a compression chamber defined between the bore and the rotor. A volume of the compression chamber gradually reduces from the compressor inlet to the compressor outlet. An economizer is configured to fluidically connect to the compression chamber. The economizer is configured to inject a working fluid into the compression chamber at an injection position. The injection position is changeable according to a working condition of the compressor.

A technique that allows a plurality of series-connected compressors in a refrigerant circuit to have equal amounts of oil in a more versatile manner is provided. A compression apparatus according to an embodiment in the disclosure includes series-connected compressors 10, 20 in a refrigerant circuit 1 that is to circulate a refrigerant; an oil separator 30 is provided in a discharge passage 50 of the compressor 10 of the compressors 10, 20, and separates oil from the refrigerant discharged from the compressor 10 and causes the refrigerant separated from the oil to flow downstream (intake passage 80); an oil return passage 70 returns the oil separated by the oil separator 30 to the compressor 10 neighboring upstream; an oil discharge outlet 10A is provided in the compressor 10; and an oil discharge passage 60 connects the oil discharge outlet 10A to an inlet of the oil separator 30.

The present disclosure provides a variable-frequency compressor with adaptive heating power control and a method for operating the same. According to an embodiment of the present disclosure, the variable-frequency compressor includes: a compression unit, for compressing a medium entering the variable-frequency compressor; a motor, including a stator and a rotor, for driving the compression unit; and a controller, configured to adaptively control a heating power of a winding of the stator according to information of the variable-frequency compressor.

A compressor or vacuum pump including: a casing having a cooling gas inlet and a cooling gas outlet for allowing a cooling gas to flow therethrough; a fan mounted at the cooling gas inlet, including a fan housing and configured to blow said cooling gas into said casing; a compression or vacuum chamber including a first housing, a process gas inlet and outlet for allowing a process gas to flow therethrough and at least one rotating element; a driving module including a second housing and at least one bearing for supporting said at least one rotating element; a silencer including a cover and configured to attenuate noise generated by the compressor or vacuum pump. The silencer includes a recess structure on its cover, configured to deflect the cooling gas flow from the fan towards the driving module.

An in-vehicle motor-driven compressor includes a temperature rise estimator configured to estimate a temperature rise of the diode based on an expected reverse current, an on-voltage of the diode, and a heat resistance of the diode. The in-vehicle motor-driven compressor further includes a rotation speed controller configured to set a rotation speed limit of the electric motor, based on the estimated temperature rise of the diode so that a temperature of the diode does not exceed a junction temperature of the diode even when the electric motor is stopped and the reverse current flows through the diode, and limit a rotation speed of the electric motor to lower than or equal to the rotation speed limit.

A compressor has a compressor body and a motor integrated with one another, with the structure in which the sub-assembly of the motor portion and the compressor body assembled by positioning centers of the motor and compressor casings with positioning pins. When the deformation of a flange surface of the motor casing is large on a side of the compressor casing, positioning pin holes may have positional dimensions where the positioning is difficult, and the rigidity of the motor casing is increased to avoid change to the dimensional positions of the pin holes of the motor casing after the sub-assembly process. Fastening seats to fasten a motor stator by use of fastening members and ribs to reinforce the fastening seats are thus provided inside the motor casing to increase rigidity of the motor casing and inhibit deformation of the positional dimensions of the positional pin holes.

A fluid machine includes an electric motor, an inverter, a housing, a cover member that is fixed to the housing and defines an accommodation chamber, a sealing member that is disposed between the cover member and the housing, and a fastening member that is fastened to the housing. The housing has an insertion hole. The fastening member has a shank inserted into the insertion hole, a flange applying a fastening force to the cover member through a rubber washer, and a positioning portion defining positions of the shank and the flange relative to the housing. The cover member is supported on the housing. Stiffness of the rubber washer is greater than stiffness of the sealing member.