| 摘要 |
<p>Apparatus for providing power to run essential machinery ordinarily run by an electrical main powered motor has a stand-by engine coupled by automatic clutch to the machinery to be driven. A compressed air system is fed by an electric motor driven compressor deriving its power from the electric supply main and by the stand-by engine driven compressor during periods of power failure. This system holding compressed air in reserve in a storage tank is used for powering a pneumatic motor to start the engine upon failure of power in the electric supply main. The supply of compressed air to the starter motor and to operate an engine operation switch is controlled by a power failure detector system also air operated which normally withholds compressed air from the pneumatic starter motor, but upon failure allows passage of the air to the starter motor. An engine running detector in turn controls pneumatically the starter valve system to stop the flow of air to the starter motor thus stopping the starter motor once the engine is running. A time delay in the power failure detector prevents starting the stand-by engine during momentary losses of power. As power is restored in the electric supply main, the power failure detector turns the engine switch off thus stopping the stand-by engine.</p> |
