Pump body device, compressor and vehicle

The pump body device comprises a rotor seat, a rotor, a connecting shaft and a first end cover, the rotor seat is provided with a rotor cavity, the rotor is arranged in the rotor cavity, the connecting shaft is connected with the rotor to limit the position of the rotor, the first end cover is connected with the connecting shaft to limit the position of the connecting shaft, and the first end cover is fixedly connected with the rotor seat. According to the technical scheme, the first end cover is positioned through the rotor seat, the connecting shaft is positioned through the first end cover, the rotor is connected through the connecting shaft, and then the rotor is positioned in the rotor cavity. In the rotating process of the rotor, the driving assembly only provides driving force for rotation of the rotor, so that the possibility of friction between a rigid structure of the rotor and other structures of the pump body device in the rotating process of the rotor is reduced, and the probability of abnormal s