Patent ID: 9163643
Filing Date: 2015-10-20
Classification: F04D,F05D

Abstract:
1. A suction casing comprising: a casing main unit having a substantially donut-shaped hollow portion inside thereof; a suction nozzle that introduces a fluid from an outer circumferential side to an inner circumferential side in a radial direction; a chamber that comprises a substantially doughnut-shaped space in communication with an inside of the suction nozzle on the outer circumferential side and that guides the fluid, introduced from the suction nozzle, to an inlet opening portion opening in an axial direction and having a substantially annular shape; and a fitting part that is located in the chamber and is fitted into the chamber at a range of a lower portion from side portions of the chamber, to form a remaining space of the hollow portion as a flow path through which the fluid flows, wherein the chamber includes an introduction portion communicating with the inside of the suction nozzle, and a guide portion communicating with the introduction portion and the inlet opening portion, and a radial width of the introduction portion has a width that is constant from a top of the chamber, the top of the chamber being a joint portion to which the suction nozzle is joined, to both sides of the chamber, which are substantially 90 degrees away from the top of the chamber in a circumferential direction, and gradually narrows in the circumferential direction from an outer peripheral surface of the fitting part in the range of the lower portion from the side portions of the chamber.