Mitsubishi Heavy Industries Limited

Akio Kishimoto

Kenji Ueda

Zenichi Yoshida

Kazuhiko Imoto

A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.

Compressor for use in refrigerator

A compressor for use in a refrigerator, which has a rotary shaft supported by bearings to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft to continue rotating for a while after a liquid refrigerant pump is stopped at, for example, a power failure, thereby preventing the bearings from being damaged. To that end the compressor has a reservoir liquid tank for storing high pressure liquid refrigerant to be supplied to the bearing and a gas storage tank for storing high pressure gas. There is a valve system connected between the gas storage tank and the reservoir liquid tank which is operable upon a power failure to supply high pressure gas to the liquid storage tank.

A parallel type refrigerator provided with a plurality of condensing chambers which are formed by partitioning the inside of a shell of a condenser by partition plates so that a cooling medium flows through tubes respectively provided in the plurality of condensing chambers in sequence, and further provided with a plurality of evaporating chambers which are formed by partitioning the inside of a shell of an evaporator by partition plates so that a cooled medium flows through tubes respectively provided in the plurality of evaporating chambers in sequence. Further, in this apparatus, the plurality of condensing chambers of the condenser, the plurality of throttling mechanisms, the plurality of evaporating chambers and the plurality of compressors are connected through refrigerant piping so that refrigerants discharged from the plurality of compressors are circulated to the plurality of compressors through the plurality of condensing chambers of the condenser, the plurality of throttling mechanisms and the plurality of evaporating chambers in this order.

Parallel type refrigerator

A turborefrigerator in which a coolant discharged from a turbocompressor is condensed in a condenser by dissipating heat to a cooling medium and is then reduced by a throttling mechanism, and thereafter, the coolant evaporates by absorbing heat from a cooled medium in an evaporator and is circulated to the turbocompressor. The present invention simplifies the configuration of such a turborefrigerator, so that the size, weight and cost thereof are reduced. Moreover, the present invention enhances the coefficient of performance thereof and prevents lubricating oil and a cooling medium from blending with each other to cause inconveniences. Thus, the turborefrigerator of the present invention is further provided with an inverter motor whose output shaft directly connected to an impeller of the turbocompressor is supported by a bearing lubricated by a liquid refrigerant, and with a control unit adapted to control both of a suction vane, which is provided in the turbocompressor, and the inverter motor by associating said suction vane and the inverter motor with each other.

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Takasago, Japan

Akio Kishimoto