DRAINAGE PUMP

A drainage pump (100) includes a housing (110) that defines a receiving space (111) configured to receive fluid. The housing (110) defines a suction port (113) configured to introduce fluid into the receiving space (111), and a first discharge port (114) and a second discharge port (115) that are configured to discharge the fluid in the receiving space (111) to an outside of the housing (110). The drainage pump further includes an impeller (121) disposed in the receiving space (111) and configured to rotate about a rotation axis to thereby discharge the fluid in the receiving space (111) through the first discharge port (114) or the second discharge port (115); a first rib (130) that protrudes from an inner circumferential surface of the housing (110) toward a center of the receiving space (111) and that is disposed between the first discharge port (114) and the second discharge port (115); and a second rib (140) that protrudes from a portion of the first rib (130) toward the center of the receiving space (111).