Patent attributes
A steam generator includes a boiler, a water supply pipe, a drainage pipe, and a steam supply pipe. The boiler has a first side wall, a second side wall, a bottom wall, a water inlet, a drain outlet, and a steam discharge port. The water supply pipe supplies water to the boiler. The drainage extends to a drainage pipe outlet below the drain outlet by way of a curved portion thereof having a shape projecting upward from the drain outlet. The steam supply pipe supplies steam to a cavity. The bottom wall has an inner bottom surface downwardly inclined from the first side wall toward the second side wall which faces the first side wall. The water inlet is in the first side wall near the inner bottom surface, and the drain outlet is in the second side wall near the inner bottom surface and lower than the water inlet.
