The present invention relates to a kneading and displacing method and mechanism for fluid machinery and the use. The invention is suitable for application in internal combustion engine, pump, compressor, motor, driving, cooling, metering and other fields. During kneading and displacing process, the kneading wheel revolves and rotates in opposite directions inside the kneading cavity to synthesize the kneading and displacing motion, which has greatly lowered speed, moment of momentum and loss rate compared with rotor motion and needs no lubrication. The fluid machinery operating on the kneading and displacing method and mechanism may be used for both gas and liquid and has wide use.
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