Long-service-life electric air pump for balancing pressure of engine crankcase

The utility model provides a long-life electric air pump for balancing the pressure of an engine crankcase, which comprises a motor, a lower cover plate, a stator, a rotor, blades and an upper cover plate, the upper cover plate, the stator and the lower cover plate are fixed on a motor flange through bolts, the rotor and the blades are positioned in an inner cavity of the stator, and the rotor is driven by an output shaft of the motor; the inner cavity of the stator is elliptical, the long radius of the inner cavity is b, the short radius of the inner cavity is c, the length of the blades is a, the maximum extension amount of the blades is d, the ratio of b to c is 1.1-1.3, the ratio of a to b is 0.5-0.6, the ratio of d to a is 0.2-0.4, the ratio of e to a is 0.1-0.15, and the ratio of e to d is 0.5-0.65. By optimizing and adjusting the ratio of the length of the blade, the maximum extension of the blade, the thickness of the blade, the long radius of the inner cavity of the stator and the short radius of the