In a roots blower, the main casting parts typically include:
1. Housings: These are the outer casings that contain the internal components and support the entire structure.
2. Rotors: The lobed rotors are essential for creating the compression and displacement of air or gas.
3. End Plates: These plates seal the ends of the housing and support the rotors.
4. Inlet and Outlet Ports: These are the openings for air or gas to enter and exit the blower.
5. Bearings: While not always cast, bearing housings support the rotors and maintain alignment.