A suction passage includes: a first passage that is cylindrical and connected to a suction unit; and a second passage whose one end is connected to the first passage and other end has an opening on the inner circumference of a cylinder. The second passage is formed, from its one end to the other end, in a slit-like shape penetrating the upper side and the lower side of the cylinder, and satisfies LW1, W1D10.7, W2D1 where the width of the second passage at the other end in a circumferential direction of the cylinder is W1, the width of the second passage at the one end is W2, the length of the second passage from the one end to the other end is L, and the inner diameter of the first passage at an area connected to the second passage is D1.

According to one embodiment, a rotary compressor includes a compression mechanism unit. When H is the length of a middle shaft part, Hp is the length of a bearing hole, Dp is the inner diameter of the bearing hole, Dc is the outer diameter of a crank part, Dm is the outer diameter of the middle journal part, C1 is the axial length of a first chamfered part provided to a middle shaft part-side end edge of the crank part, C2 is the axial length of a second chamfered part, C3 is the axial length of a third chamfered part, and C4 is the axial length. of a fourth chamfered part, Dp is larger than Dc and Dm, and the relationships of [Equation 1] HHp, [Equation 2] H>HpC1C2{square root over ((Dp.sup.2Dc.sup.2))}, and [Equation 2] H>HpC3C4{square root over ((Dp.sup.2Dm.sup.2))} are all satisfied.

A rotary compressor includes a roller that is provided with oil grooves concavely formed in a centrifugal direction from an inner circumferential surface of the roller facing an eccentric portion. The oil grooves are disposed at positions not overlapping an intake and a discharge port in an axial direction.

A rotary compressor is disclosed. The rotary compressor includes a sidewall path formed in an inner wall of a cylinder facing a vane slot and configured to form a space facing a side surface of a vane, and the vane is provided with a communication part configured to selectively communicate between the outside of the vane slot and the sidewall path according to a position of the vane.

According to one embodiment, a rotary compressor includes a compression mechanism unit and an electric motor. The compression mechanism unit includes a first bearing, a second bearing, first to third refrigerant compression units, a second intermediate partitioning panel, and a rotation shaft. The compression mechanism unit is fixed to the sealed container by a pair of fixing units which are provided at two locations spaced apart from each other in the axial direction of the rotation shaft, and the center of gravity of a structure comprising the compression mechanism unit and the rotor of the electric motor is positioned between the pair of fixing units.

Disclosed is a compressor including a housing, and a motor including a stator to be interference fitted into and fixed to an inner circumferential surface of the housing and a rotor rotatable inside the stator. The stator includes an annular back yoke disposed inside the housing, a plurality of teeth extending radially inward from the back yoke, and a coil wound on the plurality of teeth. The back yoke includes a deformation portion compressed and deformed by the housing while the stator is interference fitted into the inner circumferential surface of the housing, a contact portion which protrudes radially outward from the deformation portion and being in contact with the housing, and a cavity formed on a radial inner side of the deformation portion into which which the deformation portion is deformed.

A rotary compressor has a combined vane-roller structure that may ensure improved productivity and reliability through control of mechanical properties. The rotary compressor includes a coupling groove which is disposed at one side of an outer circumferential surface of the roller, which has a circular arc shape from an outer diameter of the roller towards an inner diameter of the roller, and which is configured to couple a vane and the roller, and includes a ferrosoferric oxide (Fe.sub.3O.sub.4) film on a surface of the coupling groove. A manufacturing method of the rotary compressor is also described.

A robot vacuum cleaner that may increase cleaning efficiency around obstacles includes a main body having an intake to suck in dust and air while the main body is driven on a floor, a shutter installed in front of the intake to be able to move from the main body toward the floor, and a shutter driver configured to supply power to move the shutter.

Disclosed herein is a rotary compressor capable of maintaining the overall dynamic balance and providing low vibration and low noise even at high speed operation and capable of improving efficiency by providing a communication passage to communicate operation chambers, which are provided inside each of the plurality of cylinders for compressing a refrigerant, to each other. The rotary-type compressor includes a housing, a drive motor provided inside the housing to generate power and having a stator and a rotor, and a compression unit that receives power from the drive motor and compresses the refrigerant. The compression unit includes a plurality of cylinders in which an operation chamber to compress the refrigerant is provided. The operation chambers provided in each of the plurality of cylinders are provided to have different volumes, and a balancer provided to maintain dynamic balance is provided only in the lower side of the rotor.

The present invention includes a case, a driving motor, a rotating shaft, a cylinder having a compression space formed in a central portion thereof, a roller, a main bearing and a sub bearing, and a vane for partitioning the compression space into a suction chamber and a compression chamber, wherein the vane includes a vane housing provided with a space portion and a communication hole formed through one side of a front end portion thereof to form a flow path of a compressed refrigerant, and a valve member slidably installed in the space portion of the vane housing and selectively communicating the space portion with the compression chamber, wherein the flow path of the compressed refrigerant is formed by the movement of the valve member.