Large box type generator

A large-scale box-type generator comprises a main generator, an air cooling device, a brushless excitation system and a main junction box, the air cooling device is of a box-type air cooling structure, and plane sealing between an air-water cooler of the box-type air cooling structure and a machine base and plane sealing between an end cover and the machine base both adopt salt-spray-corrosion-resistant sealing strips. The lap joint parts of the sealing strips are spliced by adopting dovetail grooves; and a shaft penetrating part of the main generator is sealed by a rainproof cover, a carbon sealing device and a floating sealing device in sequence in a combined manner. The large-scale box-type generator adopts a box-type air cooling structure, is arranged in a single layer, and is not influenced by a water source in a use occasion; and for plane sealing between the cooler and the engine base as well as between the end cover and the engine base, high-performance salt-spray-corrosion-resistant sealing strips ar