Importance

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Abstract

An improved variable displacement mechanism for a slant plate type compressor, such as a wobble plate type compressor, which increases the cooling efficiency of the compressor is disclosed. The variable displacement mechanism includes a passageway to allow communication between the suction chamber and the crank chamber, and a valve control mechanism for controlling the opening and closing of the passageway. The valve control mechanism includes a first valve control device with a first valve element which opens and closes a hole linking the suction chamber and the crank chamber. The first valve control device acts in accordance with the pressure within its interior space. The valve control mechanism also includes a second valve control device which controls the interior pressure of the first valve control device. The second valve control device is responsive to the actual operating conditions of the compressor. In one embodiment, the second valve control device includes a coil spring made of a shaped memory alloy which expands and contracts in accordance with the temperature within the second valve control device.

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First Claim