Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Tsuyoshi Karino

Hirofumi Yoshida

Hiroaki Nakai

Yu Shiotani

Shingo Oyagi

Ryuichi Ohno

Noboru Iida

Hiroshi Hasegawa

Takeshi Ogata

Takumi Hikichi

Masanobu Wada

Akira Hiwata

Kentaro Shii

Tadayoshi Shoyama

Daisuke Funakosi

Kiyoshi Sawai

Masao Nakano

Akinori Fukuda

Daisuke Funakoshi

Takeshi Hiratsuka

Shinichi Yoshizuka

Hitoshi Takao

Shozo Hase

Nobuyuki Kawahata

Toshihiro Sugie

Itsuo Shimizu

A rotary compressor having two cylinders includes crankshaft having first eccentric portion and second eccentric portion connected to each other by connecting portion. The rotary compressor further includes two compressive elements that compress working fluid in cylinder as first piston inserted over first eccentric portion eccentrically rotates in accordance with rotation of crankshaft. Further, first piston inserted over first eccentric portion undergoes assembly by being inserted over first eccentric portion through second eccentric portion. Further, a releasing portion is provided at each of outer diameter portions of first eccentric portion and second eccentric portion.

Rotary compressor having two cylinders

A rotary compressor () includes a closed casing (), a cylinder (), a piston (), a lower bearing member (), a vane (), a suction port (), a discharge port (), and a partition member (). The partition member () is attached to the lower bearing member () so as to form a refrigerant discharge space () serving as a flow path of a refrigerant discharged from a discharge chamber () through the discharge port (). The lower bearing member () is provided with a first recess () on the same side as the suction port () with respect to a reference plane, the reference plane being a plane including a central axis of the cylinder () and a center of the vane () when the vane () protrudes maximally toward the central axis of the cylinder (). A portion of oil stored in an oil reservoir () flows into the first recess (), and thereby an oil retaining portion () is formed.

Rotary compressor

A rotary compressor () includes a closed casing (), a cylinder (), a piston (), a lower bearing member (), a vane (), a suction port (), a discharge port (), and a partition member (). The partition member () is attached to the lower bearing member () so as to form a space enclosed by the partition member () and the lower bearing member () at a position adjacent to the lower bearing member (). A portion of an oil stored in the oil reservoir () flows into the enclosed space, and thereby an oil retaining portion () is formed. The oil retaining portion () is located on the same side as the suction port () with respect to a reference plane (H).

Rotary compressor with oil retaining portion

A compression element includes a substantially spiral oil groove which is provided in inner peripheral surfaces of bearings and of the shaft. One end of the oil groove opens at a bearing base portion, and the other end of the oil groove opens at a bearing end. According to this configuration, oil in a gap between the shaft and inner peripheries of the bearings and forcibly discharges, into the hermetic container, gas bubbles generated in a sliding gap between the shaft and the bearings and by action of a viscosity pump generated by the substantially spiral oil groove, and it is possible to provide a rotary compressor capable of preventing seizing and wearing caused by gas-involvement at a bearing sliding portion, and capable of securing reliability when refrigerant including R32 is used.

Rotary compressor having an oil groove in an inner peripheral surface of a bearing

In a rotary compressor of a vane rotary type, an outer peripheral surface of an eccentric portion of a shaft on a side adjacent to a center of the shaft is located radially inwardly of an outer peripheral surface of a main shaft inserted in a main bearing and that of an auxiliary shaft inserted in an auxiliary bearing. Also, a back clearance means used in mounting a piston on the shaft is provided in each of an inner peripheral surface of the piston and the eccentric portion of the shaft. Such configurations can reduce a diameter of the eccentric portion. A reduction in diameter of the eccentric portion can reduce a viscous force of oil acting between the eccentric portion of the shaft and the inner peripheral surface of the piston to thereby reduce a rotational moment about a center of the eccentric portion of the shaft, which rotational moment acts on the piston in a direction of rotation of the shaft, thus making it possible to reduce a sliding loss that is generated by a reciprocating motion of a vane in a vane groove.

A scroll compressor employs therein a refrigerant having a small global warming potential and a small ozone depletion potential and mainly comprising hydrofluoroolefin having a carbon-carbon double bond. A stationary scroll has and end plate and a discharge port defined in the end plate at a central portion thereof so as to open into a discharge chamber. The stationary scroll also has a bypass hole defined in the end plate to allow a plurality of compression chambers to communicate with the discharge chamber before the compression chambers communicate with the discharge port. A check valve is provided on the bypass hole to allow the refrigerant to flow from the compression chambers to the discharge chamber. This construction can restrain a baneful influence on the global environment, reduce a temperature increase caused by excessive compression, and restrain decomposition of the refrigerant even in long-term use.

Scroll compressor with bypass holes

A compressor, characterized in that a steel is used as the base material for the other sliding material vaneand nitrided, a CrN or DLC film is formed on the surface by PVD treatment, and a Ni&#x2014;Cr&#x2014;Mo cast iron is used for the other corresponding sliding material piston. It is possible in such a configuration to suppress the temperature rise by sliding friction of the sliding materials, such as the vane tip regionand the peripheral region of pistonthat are vigorously slid, relax decomposition of the refrigerant, and suppress corrosion by hydrogen fluoride generated in reaction with water and oxygen, and thus to provide a compressor higher in reliability.

Compressor with steel and cast iron sliding materials

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Shiga, Japan

Tsuyoshi Karino