Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Ryuichi Ohno

Hirofumi Yoshida

Hiroaki Nakai

Tsuyoshi Karino

Noboru Iida

Yu Shiotani

Hiroshi Hasegawa

Takeshi Ogata

Takumi Hikichi

Atsushi Sakuda

Kiyoshi Sawai

Masanobu Wada

Akira Hiwata

Kentaro Shii

Shingo Oyagi

Tadayoshi Shoyama

Tatsuya Nakamoto

Daisuke Funakosi

Hiroyuki Fukuhara

Hideki Murakami

Daisuke Funakoshi

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

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

Lifetime required of mobile-use fuel cells is secured and prolonged, stabilized pump performance is maintained by preventing bearing seizure and abnormal wear. The shaft () of a pump mechanism section () and the shaft () of a motor section () are integrated, and the shafts () are supported by two or more ball bearings disposed in the pump mechanism section (), thereby making it possible to fill grease in the closed spaces of the ball bearings (), and secure a sufficient lifetime basically with almost no possibility of the grease leaking out, even if it is used at a relatively high environmental temperature.

Air pump

It is an object of the present invention to provide a vane rotary type air pump in which a pump mechanism and a drive motor are directly connected to each other and low noise is realized. In the vane rotary type air pump in which a cylinder (), a rotor () and a vane () are sandwiched between a front plate (not shown) and a rear plate (not shown), an opened end () of the vane groove () is provided in a reversed rotation direction region of the rotor () with respect to straight line connecting a center O of the rotor () and the closed end () of the vane groove (). That is, a 'stroke' type vane disposition is employed. With this noise of the air pump is reduced.

Oilless rotary vane pump having open ends of vane grooves being inclined rearward in the rotation direction

Growing community of inventors

Shiga, Japan

Ryuichi Ohno