CENTRIFUGAL PUMP

摘要

PURPOSE: A centrifugal pump is provided to reduce an axial trust generated by the pressure difference of the front and rear surface parts of an impeller, thereby facilitating the impeller work of fluid. CONSTITUTION: A centrifugal pump includes an impeller and a casing (40). The impeller includes a rear shroud (10), multiple blades, and a front shroud (30). A shaft tube body (11) is provided that the rotating shaft is penetrated and coupled to the center of the rear shroud. The blades bend and extend, along the radial direction, from the outer circumferential surface of the shaft tube body, which protrudes forward of the rear shroud, to the edge of the rear shroud. The front shroud covers the front of the plurality of blades, and has a passage between the rear surface (12) and the spaced front surface of the rear shroud and has an inlet (31) of fluid at the center part between the front shroud and the shaft tube body. The casing has a gap through the leakage fluid and passes between the casing and the front surface of the front shroud, and covers the outer circumferential parts of the front shroud and the rear shroud of the impeller. The axial trust reducing means is provided in the casing in order to prevent the axial trust from being generated by the pressure difference between the front surface part and the rear surface part of the impeller at the time of impelling the fluid of the impeller.