Structure of rotor connection of multi-axial multi-stage roots pump

A plurality of rotor bodies in rotor connection with one another, wherein each rotor body of the plurality of rotor bodies are characterized in that each rotor body includes a rotor shaft arranged on a first end face of each said rotor body;

• a sub-shaft cavity opened in the rotor shaft of each said rotor body wherein the sub-shaft cavity and the rotor shaft are arranged concentrically and coaxially within each said rotor body;
• a first locating keyway opened on a first side inside the sub-shaft cavity of each said rotor body and a second locating keyway opened on a second side inside the sub-shaft cavity of each said rotor body in a symmetrical position with said first locating keyway, wherein said first and second locating keyway each begin at an edge of the sub-shaft cavity of each said rotor body;
• a sub-shaft arranged on a second end face, opposite said first end face, of each said rotor body wherein the sub-shaft and the rotor shaft of each said rotor body are arranged concentrically and coaxially;
• and a first sub-shaft locating keyway opened on a first side of the sub-shaft of each said rotor body and a second sub-shaft locating keyway opened on a second side of the sub-shaft of each said rotor body in a symmetrical position with said first sub-shaft locating keyway, and wherein said first and second sub-shaft locating keyway being at an edge of the sub-shaft of each said rotor body;
• wherein the sub-shaft of one rotor body is securable within a sub-shaft cavity of an other rotor body adjacent said one rotor body through the use of two sub-rotor shaft keys placed within the first and second locating keyways, respectively, within the sub-shaft cavity of the other rotor body and the first and second sub-shaft locating keyways within the sub-shaft of the one rotor body.