Abstract: The invention relates to a roudong volume variation method for fluid machinery and its mechanisms and applications, which is suitable to be used in internal combustion engine, pump, compressor, motor, transmission, refrigeration, metering, etc. In the roudong volume variation method, a roudong volume variation motion can be produced by the combination of a revolution of a roudong rotor in a roudong cavity and a rotation of the same in an inverse direction, causing speed, moment of momentum and loss to be reduced by 90%˜99% in comparison with a rotor with the same ratio. A roudong internal combustion engine has an efficiency increase of 25% and is free from lubrication. A roudong pump has an efficiency as high as 90%. Roudong isothermal compression can reduce 39%˜67% work, while roudong refrigeration can reduce 50% work. Roudong general fluid machinery has the functions of pump and motor, and also has such functions as metering, control, etc.

Abstract: The present invention provides a electronic switch suitable for fading on/off control of electrical equipment like lamps and motors. The main circuit comprises a rectifier bridge circuit and a thyristor. A control circuit includes a fast discharging synchronic integrator and a trigger pulse integrator, the former acts as a pulse phase shifter to provide a self-adapting magnitude variable sawtooth waveform, while the latter acts as a dynamic phase variation memory so as to provide a variable reference for comparison. Trigger pulses which are feed back via the main circuit causes the synchronic integrator to fast discharge. If a control switch is closed, the voltage on the integral capacitor and the trigger angle decreases gradually to produce the fade on. In the fade off process, the conditions are just the opposite. Fading on/off time can be independently set.