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.

A screw compressor of the present invention comprises: a housing having a compression chamber; male and female rotors provided in the compression chamber; a driving shaft for rotating the male and female rotors; and a seal cover across which the driving shaft is provided, and further includes: an oil chamber provided at the seal cover, and returning, to the compression chamber, oil having leaked into the driving shaft; and a breather for injecting external air into the oil chamber. Therefore, the breather is provided at the upper part of the oil chamber and an oil recovery line is provided at the lower part thereof so as to cause a pressure difference between the upper and lower parts of the oil chamber, such that the flow of the oil having leaked into the driving shaft is smoothly recovered in the oil recovery line.

Liquid ring systems are known for compressing gasses. However, known systems include moving surfaces that require high precision manufacturing. The invention provides a valve arrangement for a liquid ring system comprising: a plurality of plates; a vane set; and a chamber set that comprises at least one chamber, wherein a first chamber of the chamber set comprises: a first valve, disposed on a first plate of the plurality of plates, which is configured to be closer to the first face of a first vane of the vane set than the second face of the second vane of the vane set; and a second valve, disposed on a second plate, which is configured to be closer to the second face of the second vane than the first face of the first vane.

A rotary internal combustion engine has: a rotor; a housing circumscribing a rotor cavity, the rotor received within the rotor cavity, the housing having a peripheral wall and a side housing assembly secured to the peripheral wall, the side housing assembly having plates located at spaced apart ends of the peripheral wall, the plates defining seal running surfaces in sealing engagement with opposed end faces of the rotor, the plates made of silicon carbide.

A gear bearing structure for an external gear pump includes a driving gear and the driven gear accommodated rotatably in a pump body of the external gear pump, an inlet chamber formed on one side of a mesh portion of the driving gear and the driven gear, an outlet chamber formed on the other side of the mesh portion, a hollow cylindrical bushing for holding a rotational shaft of the driving gear or the driven gear with a lubricating liquid film formed between itself and the rotational shaft, and a ring plate spring disposed between the pump body and the bushing to urge the bushing so as to slidably contact with a side face of the one of the driving gear and the driven gear.

Provided is a motor rotor which, without changing an integral fastening structure relying on swage pins, increases resistance to the excessive excitation force of the motor rotor and which can easily prevent decreases in fastening strength; a motor that uses the motor rotor, and an electric compressor are also provided. This motor rotor is provided with a cylindrical rotor core comprising multiple laminated magnetic steel sheets, end plates and balance weights laminated on both ends of the rotor core, and multiple headed swage pins which are inserted from one side and which integrally fasten the rotor core, the end plates and the balance weights. The material of the balance weight arranged to the head of the swage pin is harder than that of the swage pin, and the material of the balance weight arranged to the swage part of the swage pin is softer than that of the swage pin.

An elastic body is provided which biases one of a fixed scroll and an orbiting scroll in a direction in which the fixed scroll and the orbiting scroll are spaced away from each other. With this, upon the start-up of a compressor, a gap is formed between the fixed scroll and the orbiting scroll, and thus the startability is improved.

A pump is described, including: a drive shaft including a rotor; a first housing part and a second housing part, between which a pump chamber is formed, in which the rotor is arranged; a rotary bearing via which the drive shaft is mounted on the first housing part such that it can rotate about its rotational axis; and a passage including a first opening and a second opening, wherein the rotary bearing is arranged between the pump chamber and the first opening, and the second opening of the passage emerges onto the side of the second housing part which faces away from the pump chamber.

A vane pump including a housing having a peripheral wall portion, a bottom wall portion, and a pump chamber; a rotor disposed in the pump chamber to be rotatable; a vane disposed to be slidable in the radial direction with respect to the rotor and partitioning the pump chamber into working chambers; and a reed valve that opens and closes a discharge hole of the bottom wall portion. A pressure relief groove is disposed in a portion of the bottom wall portion corresponding to the discharge section with a clearance secured between the peripheral wall portion and the pressure relief groove. When the vane overlaps the pressure relief groove, a pair of the working chambers on both sides of the vane in the rotational direction communicates with each other via the pressure relief groove.

In a scroll compressor (1) provided with a fixed scroll (3) and an orbiting scroll (5), an inclined portion is provided in which the inter-facing surface distance (L) between an end plate (3a) and an end plate (5a) that face each other decreases continuously from the outer peripheral side towards the inner peripheral side. The inclined portion is configured from wall inclined portions (3b1, 5b1) in which the height of a wall (3b, 5b) decreases continuously from the outer peripheral side towards the inner peripheral side, and end plate inclined portions (3a1, 5a1) in which a tooth bottom surface is inclined in accordance with the incline of the wall inclined portions (3b1, 5b1). The inclined portion is provided across a range of no less than 180° around the center of the spiral.