A fluid filter includes a body portion and a filter membrane portion. The body portion includes at least one aperture formed therein, wherein the filter membrane portion is disposed in the at least one aperture to filter contaminants from a fluid (e.g., a lubricant). The fluid filter is installed in a fluid passage of scroll compressor, wherein an axial movement of the fluid filter is restrained.

A rotary machine includes an electric motor, an impeller to be rotated by driving the electric motor and suck in and compress a gas, and a housing that houses the impeller and includes a suction port for the gas. The rotary machine further includes heat dissipation fins provided on the housing and disposed to be heat-exchangeable with the gas passing through the suction port, and an inverter connected to the housing and that controls the electric motor.

A compressor includes a scroll and a discharge valve assembly mounted to the scroll. The discharge valve assembly is configured to control fluid flow through a discharge passage. The discharge valve assembly includes a first portion having a backer and a valve member. The first portion includes a discharge opening in communication with the discharge passage. The discharge valve assembly includes a second portion including a body having a top wall, an outer wall and an inner hub. The outer wall is spaced apart from and surrounds the inner hub, defining an inner passage therebetween in communication with the discharge opening. The backer is disposed between the valve member and the second portion. A portion of the outer wall engages the backer. The valve member is deflectable between a closed position restricting fluid flow through the discharge opening and an open position allowing fluid flow through the discharge opening.

A rotor is disposed adjacent the valves of an HVAC system and is configured to spin as the valves control fluid movement toward the rotor, and a magnet is coupled to the rotor and configured to spin within a stator, wherein a compressor causes fluid to move through the valves thereby causing the rotor to spin the magnet, which in turn generates an electrical current.

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 centrifugal compressor for compressing a refrigerant vapour in a refrigeration cycle. The compressor comprises an impeller drive shaft supported by first and second radial bearings for rotation within the compressor housing and an impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft. The first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapour. The compressor further comprises a conduit for supplying a portion of the refrigerant vapour from the impeller assembly to the first and second fluid bearings.

A method of operating a multiple-compressor refrigeration system is provided. This method includes the steps of supplying, via a common supply line, refrigerant gas and oil to a plurality of compressors coupled in series, and attaching an oil flow conduit between adjacent compressors of the plurality of compressors. The oil flow conduit is configured to move oil from a compressor with a relatively higher pressure to a compressor with a relatively lower pressure. The method further includes controlling the pressure for each of the plurality of compressors by regulating a speed at which each of the plurality of compressors operates in order to maintain a pressure differential between the adjacent compressors to facilitate the flow of oil from the compressor with the relatively higher pressure to the compressor with the relatively lower pressure.

A centrifugal compressor for compressing a refrigerant vapor in a refrigeration cycle. The compressor comprises an impeller drive shaft (28) supported by first and second radial bearings (32) for rotation within the compressor housing and an impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft. The first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapor. The compressor further comprising a conduit (36) for supplying a portion of the refrigerant vapor from the impeller assembly to the first and second fluid bearings.

A scroll compressor comprises a housing, a cylindrical rotating shaft, a fixed scroll, a movable scroll, and a drive mechanism. The drive mechanism includes an eccentric pin, and a balancer-integrated bush. The eccentric pin extends in parallel with the rotating shaft from the end part of the rotating shaft. The balancer-integrated bush is disposed between the eccentric pin and the movable scroll, includes an eccentric hole into which the eccentric pin is inserted, and configured to rotate around the eccentric pin, and further includes a balancer in an integrated manner, and is configured to rotatably move relative to the rotating shaft. An elastic member is disposed between the balancer-integrated bush and at least one of the rotating shaft and the eccentric pin, and the elastic member regulates the relatively movable range of the rotating shaft and the balancer-integrated bush.

The invention relates to a positive displacement machine working according to the spiral principle, in particular a scroll compressor, comprising a compressor section and a motor section, wherein an orbiting displacement spiral and a counter spiral are arranged in the compressor section, which engage into one another in such a way that variable compression chambers are formed between the displacement spiral and the counter spiral in order to receive and compress a working medium flowing through a working medium circuit, wherein an electric motor is arranged in the motor section, which is drive-connected to the displacement spiral, and wherein a cooling device is provided for cooling the electric motor. The invention is characterized in that the cooling device is independent of the working medium circuit.