Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Yu Shiotani

Takeshi Ogata

Masanobu Wada

Shingo Oyagi

Hiroshi Hasegawa

Hirofumi Yoshida

Hiroaki Nakai

Tsuyoshi Karino

Takumi Hikichi

Akira Hiwata

Kentaro Shii

Tadayoshi Shoyama

Ryuichi Ohno

Yasufumi Takahashi

Daisuke Funakosi

Osamu Kosuda

Subaru Matsumoto

Daisuke Funakoshi

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 a second principal surface () of the lower bearing member () located on the opposite side to the cylinder () 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 refrigerant discharge space () is limited so that a region where the refrigerant discharge space () is not present is formed on the same side as the suction port with respect to a first reference plane, and in that region, the second principal surface () of the lower bearing member () is in contact with an oil in an oil reservoir () directly or via the partition member ().

Rotary compressor with cylinder immersed in oil

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 compression mechanism (), a motor (), a suction path (), a back-pressure chamber (), a return path (), an inverter (), and a controller (). A check valve () of a reed valve type for opening and closing a return port () of the compression mechanism () is disposed in the back-pressure chamber (). The return path () functions to return a working fluid to the suction path () from the back-pressure chamber (). A volume-varying valve () is provided in the return path (). The volume-varying valve () allows the working fluid to flow through the return path () when the suction volume of the compression mechanism () should be set relatively small, and precludes the working fluid from flowing through the return path () to increase the pressure in the back-pressure chamber () when the suction volume of the compression mechanism () should be set relatively large.

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

There may be a case where, by simply coupling the first compressor (expander compressor unit) and the second compressor with an oil-equalizing pipe, the first compressor is not lubricated sufficiently, thereby decreasing reliability. The volumetric capacity (V) of the first available oil space () of the first compressor () is set larger than the volumetric capacity (V) of the second available oil space () of the second compressor (). With this configuration, even if the oil level (S) of the first oil sump () decreases in transition to a state of steady operation, it is possible to maintain a sufficient amount of oil in the first compressor (), and thus high reliability as a fluid machine can be achieved.

Fluid machine and refrigeration cycle apparatus

A fluid machine () includes a first compressor () and a second compressor (). The first compressor () has a first closed casing (), a first compression mechanism (), an expansion mechanism (), and a shaft (). A first oil reservoir () is formed in the first closed casing (). The second compressor () has a second closed casing () and a second compression mechanism (). A second oil reservoir () is formed at a bottom portion in the second closed casing (). The first closed casing () and the second closed casing () are connected to each other by an oil passage () so that a lubricating oil can flow between the first oil reservoir () and the second oil reservoir (). An opening () of the oil passage () on a side of the first closed casing () is located above the expansion mechanism () with respect to the vertical direction. This configuration prevents the low temperature lubricating oil in a surrounding space of the expansion mechanism () and the high temperature lubricating oil in the second compressor () from flowing. Thereby, the heat transfer between the first compressor () and the second compressor () is suppressed.

An expander-compressor unit () includes a closed casing (), a compression mechanism () disposed at an upper position in the closed casing (), an expansion mechanism () disposed at a lower position in the closed casing (), a shaft () coupling the compression mechanism () to the expansion mechanism (), and an oil pump () disposed between the compression mechanism () and the expansion mechanism (). The oil pump () supplies the oil held in an oil reservoir () to the compression mechanism () via a suction passage. A strainer () is provided to the suction passage so that the oil to be drawn into the oil pump () passes through the strainer.

Expander-compressor unit

An expander-compressor unit () includes a closed casing (), a compression mechanism (), an expansion mechanism (), a shaft (), and an oil pump (). The shaft () includes an upper shaft () provided with an upper eccentric portion () for the compression mechanism (), and a lower shaft () provided with lower eccentric portions (and) for the expansion mechanism () and an intermediate eccentric portion () for the oil pump (). The expansion mechanism () has an upper bearing member () for supporting a supported portion () of the lower shaft () located immediately above the lower eccentric portion (). The intermediate eccentric portion () has a diameter equal to or less than that of the supported portion ().

An expander-compressor unit (A) includes a closed casing (), a compression mechanism (), an expansion mechanism (), a shaft (), and an oil pump (). The shaft () couples the compression mechanism () to the expansion mechanism () so that power recovered by the expansion mechanism () is transferred to the compression mechanism (). The oil pump () is disposed between the compression mechanism () and the expansion mechanism (), and supplies an oil held in an oil reservoir () to the compression mechanism (). An oil supply passage () is formed in the shaft () so that the oil discharged from the oil pump () can be supplied to the compression mechanism (). A lower end () of the oil supply passage () is located below an inlet () of the oil supply passage () formed in an outer circumferential surface of the shaft ().

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Osaka, Japan

Yu Shiotani