INTERMEDIATE INTAKE-TYPE DIAPHRAGM AND CENTRIFUGAL ROTATING MACHINE

摘要

An introduction flow channel (51) configured to guide a first fluid (G1) toward an impeller (3), an intermediate suction flow channel (62) adjacent to the introduction flow channel (51) and configured to guide a second fluid (G2) toward the impeller (3), and a curved flow channel (52) connected to downstream sides of the introduction flow channel (51) and the intermediate suction flow channel (62) are defined. The curved flow channel (52) extends so that an inner surface is curved from a position of connection with the introduction flow channel (51) toward one side in the direction of the axial line (O). The diaphragm includes a flow-regulating vane (54) that is provided in the introduction flow channel (51) to regulate the first fluid (G1) to flow along the radial direction; and a partition wall (9) that partitions the introduction flow channel (51) and the intermediate suction flow channel (62) in the direction of the axial line (O). A radially inner end portion (9c) of the partition wall (9) is located further on a radially inner side than a radially outer end portion (54d) of the flow-regulating vane (54), and further on a radially outer side than a boundary (F) between the introduction flow channel (51) and the curved flow channel (52).