Patent ID: 10054120

Abstract:
The present invention relates to a volute pump and particularly provides a volute pump for delivering a liquid containing fibrous substances and solid substances, while preventing these substances from obstructing the pump. The volute pump includes a pump casing (10) having a protrusion (14) projecting into a flow passage (11) and separating a starting end of a volute from a terminal end of a volute. The protrusion (14) faces a liquid outlet (23) of an impeller (20). A radius of curvature (Rb) of a cross section of a distal edge of the protrusion (14) at its one side end (14b) is larger than a radius of curvature (Ra) of the cross section of the distal edge of the protrusion (14) at other side end (14a). The other side end (14a) faces a main plate (20a), while the one side end (14b) is located opposite to the main plate (20a).