PURGING OR VENTILATION SYSTEM AND CONTROL UNIT OR APPARATUS FOR INCREASED SAFETY AND NON-SPARKING MOTORS FOR EXPLOSIVE GAS AND DUST ATMOSPHERES

摘要

The present invention provides a control unit and purging system for pre-start purging of motor enclosure for the increased safety and non-sparking motors to prevent the explosion due to the danger of potential air gap sparking of cage rotor and potential stator winding discharge at the time of motor starting. The invention consists of a motor enclosure, connecting pipes, air filter, solenoid valves for inlet and vent, manual vent valve, inlet pressure regulator, differential pressure switch, time delay relays for motor purging time and motor starting time, a venturie flow meter, a purge switch, a power switch to the control panel, a power supply, a selector switch for purging time, a selector switch for motor starting time, and an explosion proof box for control panel components.