A rotary compressor is provided that may include a cylinder having an inner peripheral surface; a roller; and a plurality of vanes slidably inserted into the plurality of vane slots to rotate together with the roller, front end surfaces of which come into contact with the inner peripheral surface of the cylinder due to the back pressure to partition the compression space into a plurality of compression chambers. The cylinder may further include a suction flow path for refrigerant that may include a suction port that communicates with the compression space to suction the refrigerant in a lateral direction, and a suction passage disposed in a direction that crosses the suction port to provide communication between the compression space and the suction port.

This rotary compressor comprises: a casing forming the outer shape; a rolling piston configured to rotate eccentrically in an internal space; a vane configured to contact the rolling piston and divide the internal space into a suction chamber and a compression chamber; and a main suction port connecting the suction chamber to an outside of the cylinder. The rotary compressor also comprises: a cylinder disposed inside the casing; a first flange disposed above the cylinder; and a second flange disposed below the cylinder. The main suction port comprises a sub suction port extending in a direction in which at least one among the first flange and the second flange is disposed, and at least one among the first flange and the second flange has a flow path groove connecting the sub suction port and the suction chamber.

A vacuum pump comprises rotor elements arranged in a suction chamber. An outlet duct is connected to an exhaust pipe. For the purpose of silencing, sound expansion spaces are provided in the outlet duct, which are integrated into the pump housing. Alternatively or in addition to these sound expansion spaces, sound expansion spaces may be provided in an inlet duct which is used for the inlet of gas ballast, said sound expansion spaces being preferably likewise integrated into the pump housing.

A scroll compressor includes a compression chamber that compresses a fluid, an outer peripheral passage into which the fluid flows from a motor chamber, and a suction passage draws in the fluid from the outer peripheral passage to the compression chamber. The compression chamber is defined by a fixed scroll and an orbiting scroll. The outer peripheral passage is defined by a third peripheral wall of a discharge housing member and a fixed peripheral wall of the fixed scroll. The suction passage is provided in the fixed peripheral wall and includes an upstream-side outer peripheral surface located between the suction passage and an electric motor in an axial direction of a rotary shaft. A distance from an axis of the rotary shaft to the upstream-side outer peripheral surface varies in the axial direction of the rotary shaft.

A vane pump includes a rotor that is rotationally driven; vanes inserted into the rotor in a freely slidable manner; pump chambers that are defined between the vanes at adjacent positions; suction ports that guide working oil to the pump chambers; suction pressure chamber that is communicated with the suction ports and that stores the working oil; and a suction passage that is connected to the suction pressure chamber and that has an suction opening end that opens at an outer surface of a pump body. In a state in which the vane pump is mounted, the suction pressure chamber is mounted below the suction opening end of the suction passage.

The motor comprises an internal rotor having an external lob; an external rotor outside the internal rotor and having an internal lob engaging the external lob; and an inlet port and an outlet port. An inner diameter of the inlet port is less than a diameter of a dedendum circle of the internal rotor, and an outer diameter of the inlet port is greater than a diameter of a dedendum circle of the external rotor. An inner diameter of the outlet port equals the diameter of the dedendum circle of the internal rotor. An outer diameter of the outlet port equals the diameter of the dedendum circle of the external rotor. The inner diameter of the inlet port is less than the inner diameter of the outlet port. The outer diameter of the inlet port is greater than the outer diameter of the outlet port.

A rotary compressor includes a cylinder with a vane slot and a suction port. A vane is slidably disposed in the vane slot. The suction port guides fluid to a compression chamber at one circumferential end of the vane slot. The suction port may be formed in a recessed manner in a radial direction such that at least an end of the suction port in contact with an inner circumferential surface of the cylinder forms a slot shape extending between opposite axial side surfaces of the cylinder. A circumferential length of the suction port is reduced from conventional suction ports as a result of the slot configuration, thereby advancing the compression start angle, and a partition wall portion between the suction port and the vane slot may have elasticity, thereby suppressing close contact between the vane and the vane slot.

The pump housing includes a pair of sliding surfaces clamping the outer and inner gears from both their sides to allow both the gears to slide on the sliding surfaces, a suction port part suctioning fuel from outside into inside of the gear accommodation chamber, and a discharge port part discharging fuel from inside into outside of the gear accommodation chamber. At least one of the suction port part and the discharge port part includes an elongated groove that is depressed from the corresponding sliding surface and extends along a circumferential direction of the pump housing in a region opposed to the pump chambers, opening bores that open on the elongated groove from outside of the gear accommodation chamber, and ribs each of which is arranged between the corresponding adjacent two opening bores. The opening bores and the ribs are arranged alternately along an extending direction of the elongated groove.

The motor comprises an internal rotor having an external lob; an external rotor outside the internal rotor and having an internal lob engaging the external lob; and an inlet port and an outlet port. An inner diameter of the inlet port is less than a diameter of a dedendum circle of the internal lob, and an outer diameter of the inlet port is greater than a diameter of a dedendum circle of the external lob. An inner diameter of the outlet port equals the diameter of the dedendum circle of the internal lob. An outer diameter of the outlet port equals the diameter of the dedendum circle of the external lob. The inner diameter of the inlet port is less than the inner diameter of the outlet port. The outer diameter of the inlet port is greater than the outer diameter of the outlet port.

The present disclosure provides a compressor and an air conditioner. The compressor includes a housing; a first rotating shaft mounted in the housing; a connecting assembly sleeved on the first rotating shaft; and a first rotor assembly including a first rotor and a second rotor coaxially disposed on the connecting assembly. The connecting assembly carries the first rotor and the second rotor to rotate about the first rotating shaft together. The connecting assembly is configured to limit the relative positions of the first rotor and the second rotor, such that there exists a clearance between the first rotor and the second rotor. The present disclosure can maintain a clearance between the first rotor and the second rotor without increasing the number of components of the compressor.