A vane-type compressor with a reduced coating amount of a solid lubricant used for forming a solid lubricant film on an outer peripheral surface of a rotor is provided. In a vane-type compressor (1) including at least: a cylinder 8a which is housed in a housing (2), and has a complete round inner peripheral surface; a complete round rotor (4) which is housed in the cylinder (8a) such that the center (P1) of the rotor (4) is arranged at a position offset from the center (P2) of the cylinder (8a); and a shaft (3) which is press-fitted into a through hole (4a) formed in the rotor (4), a solid lubricant film (30) is formed on an outer peripheral surface (4b) and a side surface (4c) of the rotor (4), and a thickness (L) of the solid lubricant film (30) is set to a value which falls within a range from 10 µm to 20 µm from an initial stage without applying finish working so that a coating amount of the solid lubricant can be relatively reduced.

Provided is an electric compressor (1), which drives, in a cylindrical housing (2), a compressor (4) using an electric motor (3) disposed in the housing (2). The electric compressor is characterized in that the electric motor (3) is formed with a stator (7), which is fixed to the housing (2), and which generates a magnetic force when a current is carried, and a rotor (9), which is rotatably disposed inside of the stator (7), and which rotates with the magnetic force generated by the stator (7). The electric compressor is also characterized in that the stator (7) is press-fitted in a cylindrical body (6) composed of a material having a linear expansion coefficient close to that of the stator (7), and that the cylindrical body (6) is partially press-fitted at a plurality of areas in the inner wall (10) of the housing (2).

The present invention aims to provide a motor-mounted internal gear pump that is small-sized, less expensive and has high reliability, while utilizing a function of an internal gear pump that is suitable for high head.

A motor-mounted internal gear pump has a pump section (81) for sucking and discharging a liquid and a motor section (82) for driving the same. The pump section (81) has an internal rotor (1) having teeth formed around its outer periphery, an external rotor (2) having teeth formed around its inner periphery and a pump casing that accommodates both rotors (1, 2) and has a suction port (8) for sucking a liquid and a discharge port (10) for discharging a liquid. The motor section (82) has a can (6) that composes a part of the pump casing and formed of a non-magnetic material into a thin plate, a rotator arranged at the inside of the can (6) for driving the external rotor or the internal rotor; and a stator (12) arranged at the outside of the can for rotating the rotator.

A scroll type fluid compressor unit wherein, to lighten the unit, orbiting and fixed scroll members are made of aluminium or aluminium alloy. At least one of the scroll members (24) is subjected to surface hardening (35) by copper plating, hard chromium plating or anodic oxidation to reduce wear due to sliding contact between the scroll members. The sealing of fluid pockets between the scroll members is thus maintained during long use of the compressor unit. A surface hardening coating may be applied to one of scroll members and the other scroll member may be coated by a polytetrafluoroethylene coating. In this arrangement, the sliding friction between both scroll members is further reduced.

In order to avoid a surface hardening treatment, at least one of scroll members may be made of anti-wearing aluminium alloy which includes, by weight. 12-25% Si. The scroll member made of such an anti-wearing aluminium alloy is machined to obtain a desired dimensional accuracy and the machined surface, owing to the exposure of many silicon crystals, has a surface anti-wearing property.

A compressor and a method for assembling a compressor are provided. The compressor may include a compressor casing (300) coupled to each of a suction inlet (100), into which a refrigerant may be introduced, and a discharge outlet (200), through which the refrigerant may be discharged, a compressor body (400) mounted inside the compressor casing (300) to compress the refrigerant suctioned in through the suction inlet (100), and then discharge the refrigerant through the discharge outlet (200), a noise reducing member (520,530) disposed between the compressor body (400) and the compressor casing (300), and at least one fixing member (540,560) mounted inside the compressor casing (300) to fix the noise reducing member (520,530) to an inner wall of the compressor casing (300).