Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Hideto Nakao

Shin Sekiya

Shinichi Takahashi

Tatsuya Sasaki

Hideaki Maeyama

Masahiro Hayashi

Soshi Ikeda

Tetsuhide Yokoyama

Kazuya Watanabe

Shohei Ishimura

Naofumi Takenaka

Masakazu Sato

Katsuhiro Ishimura

Yusuke Tashiro

Raito Kawamura

Jun Nishio

Yoshinori Shirafuji

Yasuhide Hayamaru

Masakazu Kondo

Atsushi Kawashima

Noboru Masuda

Makoto Tsukiji

Shinsuke Miki

Takeshi Izawa

Keisaku Ishihara

An air-conditioning apparatus includes a main circuit in which a compressor, a flow switching device, an indoor heat exchanger, a pressure reducing device, and a plurality of parallel heat exchangers connected in parallel with each other are connected by pipes, a bypass pipe, a flow control device provided to the bypass pipe and configured to adjust a flow rate of refrigerant flowing through the bypass pipe, an evaporating pressure sensor configured to measure an evaporating pressure of the refrigerant, and a controller. The air-conditioning apparatus is configured to operate in a normal heating operation mode and a heating-defrosting operation mode. When an operation associated with the normal heating operation mode is switched to an operation associated with the heating-defrosting operation mode, the controller adjusts an opening degree of the flow control device using the evaporating pressure in the parallel heat exchanger and a driving frequency of the compressor.

Air-conditioning apparatus

An air-conditioning apparatus includes a main circuit in which a compressor, a load side heat exchanger, a first pressure reducing device, and a plurality of parallel heat exchangers connected in parallel with each other are connected by pipes, a bypass pipe diverting a portion of refrigerant discharged by the compressor, a flow switching unit connecting a parallel heat exchanger to be defrosted to the bypass pipe, a plurality of flow rate control devices controlling flow rates of refrigerant flowing through the plurality of parallel heat exchangers, and a controller which controls, in the heating-defrosting operation mode or in the heating operation mode after execution of the heating-defrosting operation mode, the flow rate control devices to control, in accordance with a frost state of a parallel heat exchanger functioning as an evaporator among the plurality of parallel heat exchangers, the flow rate of refrigerant flowing through the parallel heat exchanger.

Air-conditioning apparatus having heating-defrosting operation mode

A compressor of an air-conditioning device includes a scroll mechanism unit having a fixed scroll and an orbiting scroll that cooperates with the fixed scroll to compress refrigerant. There is a first space portion provided between the scroll mechanism unit and an electric motion unit; an annular second space portion provided in a circumference of the scroll mechanism unit in a radial direction; a communication path provided between the first space portion and the second space portion, to guide, to the second space portion, the refrigerant sucked from the suction pipe to the first space portion. A part of the refrigerant between the first expansion valve and the second expansion valve is injected simultaneously to the first space portion and the second space portion.

Air-conditioning device

A vane compressor including plural vanes that perform a compression operation such that the normal to a circular arc formed by each vane tip portion and the normal to the inner peripheral surface of a cylinder are constantly approximately coincident with each other. Each of the plural vanes is held constantly in the normal direction of the inner peripheral surface of the cylinder or is held constantly along a direction having a fixed inclination with respect to the normal direction of the inner peripheral surface of the cylinder so that the compression operation is performed in the state the normal to the circular arc formed by the tip portion of each of the plural vanes and the normal to the inner peripheral surface of the cylinder are constantly approximately coincident with each other. The plural vanes are rotatably and movably supported with respect to a rotor portion.

Vane compressor with vane aligners

There is provided a vane compressor with a plurality of vanes having a structure in which a rotor portion and a rotary shaft are unitarily formed so as to reduce bearing sliding loss of the rotary shaft and reduce gas leakage loss by narrowing a space formed between the rotor portion and the inner peripheral surface of a cylinder. In the vane compressor with the plurality of vanes according to the present invention, an angle &#x3b1; of a circular arc constituting the partial ring shape of each vane aligner satisfies a relationship of  where R is a distance between the rotational central axis of each bush and the rotational central axis of the rotor portion, e is a distance between the central axis of the inner peripheral surface of the cylinder and the rotational central axis of the rotor portion, and N (a natural number of two or greater) is the number of the vanes.

A vane compressor according to the present invention, including a cylinder which is approximately cylindrical and whose both ends located in an axial direction are open, a cylinder head and a frame which close both the ends of the cylinder, a rotor shaft which includes a rotor part being cylindrical and rotating in the cylinder and a shaft part transmitting torque to the rotor part, and a vane which is installed in the rotor part and whose tip portion has the R-shape facing outward, performs the compression operation in the state where the normal to the R-shape of the tip portion of the vane and the normal to the inner surface of the cylinder are always approximately coincident with each other.

Vane compressor

A refrigerant-circulating system which comprises a refrigeration cycle comprising a refrigerant compressor, a condenser, an expansion mechanism and an evaporator to form a refrigerant circuit and employing a refrigerant which contains no chlorine, wherein an aromatic polyether oil having as a base oil structure a benzene ring having an ether bond is employed as a refrigerator oil.

Refrigerant-circulating system, and refrigerant compressor and refrigeration cycle employing the refrigerant compressor

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Tokyo, Japan

Hideto Nakao