A scroll compressor includes oil in an oil storage space that is brought into direct contact with and stirred with a discharge refrigerant. The scroll compressor includes a fixed scroll, an orbiting scroll coupled to one side of the fixed scroll, and a discharge cover coupled to another side of the fixed scroll and provided with a muffler hole communicating with a refrigerant discharge space and the oil storage space.

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.

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.

Vane compressor comprising a stator, a rotor housed in the stator and provided with a body internally tangent to a side wall of the stator and with a plurality of vanes sliding in respective seats formed in the body of the rotor and pushed in a centrifugal direction to sealingly cooperate with the side wall of the stator, and a lubrication system comprising in combination one or more solid jet nozzles, arranged in the side wall of the stator to direct the solid jet towards the rotor, and at least one axial spray nozzle.

Vane compressor comprising a stator, a rotor housed in the stator and provided with a body internally tangent to a side wall of the stator and with a plurality of vanes sliding in respective seats formed in the body of the rotor and pushed in a centrifugal direction to sealingly cooperate with the side wall of the stator, and a lubrication system comprising in combination one or more solid jet nozzles, arranged in the side wall of the stator to direct the solid jet towards the rotor, and at least one axial spray nozzle.

The present disclosure relates to a two-stage rotary vane vacuum pump casing 200 that comprises an exterior surface 202 and a first plurality of cooling fins 204 (214) protruding from the exterior surface 202, wherein each cooling fin 204 (214) extends along the exterior surface 202 between a first and second cooling fin end 201a, 201b, and is a non-planar element that forms an at least partially enclosed cooling channel 206 (216) between the first and second ends 201a, 201b of the cooling fin 204 (214b). The present disclosure also provides a method of making a two-stage rotary vane vacuum pump casing 200 using extrusion and providing a removable end plate for a two-stage rotary vane vacuum pump casing 200.

The present invention relates to a device (1, 30) for the recirculation of an at least partially gaseous composition containing hydrogen, wherein the device (1, 30) is a dry rotary pump comprising a first rotating shaft (13) and a second rotating shaft (14) driving respectively a first piston with claws (8) and a second piston with claws (9) in rotation in a pumping chamber (2) comprising an inlet orifice (11) and an outlet orifice (10) for the gaseous composition, the first rotating shaft (13) and the second rotating shaft (14) being configured to be driven in rotation by a drive system (17,18) situated in a gear chamber (4), wherein the device (1, 30) comprises a first pair of seals (19) and a second pair of seals (20), each comprising a first shaft seal (19a, 20a) and a second shaft seal (19b, 20b), the first pair of seals (19) being provided around the first rotating shaft (13) and the second pair of seals (20) being provided around the second rotating shaft (14) between the pumping chamber (2) and the gear chamber (4), wherein the device (1, 30) comprises a pressure equalization chamber (25) which is in fluid connection with a gap (24) present between the first shaft seal (19a, 20a) and the second shaft seal (19b, 20b) of the first and of the second pair of seals (19, 20) to regulate the pressure in the gap (24), wherein the gear chamber (4) is in fluid connection with the gap (24), and wherein the pumping chamber (2) is in fluid connection with the first shaft seal (19a) of the first pair of seals (19) and with the first shaft seal (20a) of the second pair of seals (20) by means of a pulsation attenuation chamber (22). The present invention also relates to a fuel cell system (40, 50, 60, 70, 80, 90) comprising a device for recirculation according to the present invention.

A scroll compressor includes a scroll compression mechanism, a motor, and a casing. The motor includes a stator having a stator core and an insulator, a rotor disposed inside the stator, a coil wound around a plurality of teeth of the stator core via the insulator, and an outgoing line at an end of the coil. When the motor is viewed along a rotation axis of the rotor, at least one of the outgoing line and a film wound around the outgoing line satisfies 0.65<(D1−da)/(D1−D2)<0.95. An outer radius of the teeth centered on a position of the rotation axis of the rotor is D1. An inner radius of the teeth is D2. An average distance from the position of the rotation axis of the rotor to the at least one of the outgoing line and the film wound around the outgoing line is da.

A scroll compressor includes a scroll compression mechanism, a motor, and a casing. The motor includes a stator having a stator core and an insulator, a rotor disposed inside the stator, a coil wound around a plurality of teeth of the stator core via the insulator, and an outgoing line at an end of the coil. When the motor is viewed along a rotation axis of the rotor, at least one of the outgoing line and a film wound around the outgoing line satisfies 0.65<(D1−da)/(D1−D2)<0.95. An outer radius of the teeth centered on a position of the rotation axis of the rotor is D1. An inner radius of the teeth is D2. An average distance from the position of the rotation axis of the rotor to the at least one of the outgoing line and the film wound around the outgoing line is da.

Provided is a sliding component capable of reducing the frictional resistance of a sliding surface entailing eccentric rotation. An annular sliding component has a sliding surface relatively sliding with eccentric rotation. A plurality of grooves open to a fluid space on the inner diameter side are circumferentially provided in the sliding surface. A side wall surface of the groove is configured by a wall surface continuous in a circular arc shape in a plan view.