Deflation safety device

The utility model belongs to the technical field of turbine engine control, and particularly relates to a deflation safety device. The device is simple in structure and high in reliability, a sensor and a control system do not need to be used, and the use cost is effectively reduced. The rotating speed of the power turbine rotor is inducted through the induction coil, when the rotating speed exceeds a preset value, the deflation electromagnetic valve is automatically opened, the air flow in front of the power turbine is reduced, and overload of the engine is effectively prevented. By arranging a plurality of groups of induction coils connected in series and in parallel, when one group of induction coils breaks down, other induction coils can still work normally, and normal operation of the device is ensured. By selecting the deflation electromagnetic valve with a self-locking function, the electromagnetic valve can still be kept in an opening or closing state under the condition that an induction coil is powe