The figure shows the key structural part of the centrifugal pump - the worm shell (Volute), which is the core "heart" part of the pump. Its main function is to convert the kinetic energy generated by the high-speed rotation of the impeller into pressure energy through the spiral channel to realize the transportation of liquids (such as pumping, circulation, etc.).

The structure with flange on the left is the water inlet (usually connected to the suction pipe), and the large-diameter cylinder on the right is the water outlet (connected to the drain pipe); the internal cavity is used to accommodate the impeller, and the external ribs enhance the structural strength.