Hitachi, Ltd.

Mitsuru Murata

Masahiko Sugiyama

Shigetaro Tagawa

Masahiro Takebayashi

Hiroshi Iwata

Kazuo Sekigami

Akio Sakazume

Minoru Ooki

Gen Konno

Masatune Sutou

A horizontal type rotary compressor comprising radial partitioning walls in a discharge silencer. A slant portion is formed in the partitioning walls thereby enabling the oil within the discharge silencer to be discharged to the outside of the silencer. Thus, a noise generation due to a cavity resonance in the discharge silencer and an impact noise of a discharge valve in the oil may be prevented. At the same time, a carbonization of the oil, caused by an increase of the oil temperature, may also be prevented.

Horizontal type rotary compressor

A rotary compressor has a main bearing and a sub-bearing which are disposed on both sides of a cylinder, and a vane which is inserted at an eccentric crank pin portion of a crankshaft and is adapted to reciprocate while being in contact at one end thereof with a roller eccentrically rotating inside the cylinder. An oil feeding mechanism for the rotary compressor comprises: an oil feeding hole provided in a portion of the crankshaft closer to the end surface of a sub-journal of the crankshaft; an oil hole provided in a crank pin portion of the crankshaft such as to communicate with both the oil feeding hole and an oil groove formed on the crank pin portion; a spiral oil groove formed in the outer periphery of a main journal of the crankshaft such as to spiral in the direction opposite to the rotational direction of the crankshaft; and a spiral oil groove formed in the outer periphery of the sub-journal of the crankshaft such as to spiral in the same direction as the rotational direction of the crankshaft.

Rotary compressor with spiral oil grooves for crankshaft

A horizontal type rotary compressor including a compression element having a cylinder, a shaft having a crank thereon, a pair of side plates concurrently serving both as bearings of the shaft and as side walls of the cylinder, a roller fitted onto the crank, and a vane so arranged as to slide in a groove of the cylinder and have a tip end thereof contacted with the roller rotating in accordance with the rotation of the crank and an appropriate end thereof urged by a spring to make a reciprocating movement along the groove are provided within a case. A pumping chamber is defined by a rear face of the vane, the groove of the cylinder and the side plates. One of the side plates is formed with a suction port capable of sucking thereinto the oil within the case while the other of the side plate is formed with a discharge port for transmitting the oil in the pumping chamber to an oil feeding passage. An oil feeder means for use in the horizontal type rotary compressor is a space provided at the exit of the suction port of the side plate having the suction port and the suction port opens downwardly so that the feeding of a sufficient or stable amount of oil is ensured even when the surface level of the oil is lowered.

Oil feeder means for use in a horizontal type rotary compressor

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Tochigi, Japan

Mitsuru Murata