Centrifugal fluid machine

• Main Authors: Nagaoka, Yoshihiro, Tanaka, Sadashi, Iwase, Yukiji, Ida, Michiaki, Ishimaru, Hirotoshi, Iwasaki, Saburo, Ueyama, Yoshiharu, Yoshida, Tetuya
• Format: Patent
• Language: English
• Published: 02.04.2002

The present invention relates to centrifugal fluid machines such as a pump or compressor and, more particularly, relates to a centrifugal fluid machine in which noise and pressure pulsation may be suitably abated. At a vaned diffuser or a volute casing of a centrifugal fluid machine, pressure pulsation and vibrating forces acting upon the diffuser or the volute casing are mitigated or cancelled so as to abate the noise from the centrifugal fluid machine. The fluid machine having an impeller rotating about a rotating shaft within a casing and having a vaned diffuser or volute fixed to the casing is constructed such that radius of the vane trailing edge of the impeller and radius of the vane leading edge of the diffuser or radius of the volute tongue is varied in the direction of axis of rotation and inclinations, on a meridional plane, of the vane trailing edge of the impeller and the vane leading edge of the diffuser or the volute tongue are set in the same orientation, thereby reduction in head and efficiency or occurrence of an axial thrust may be restrained to the extent possible to optimally abate the noise and pressure pulsation of the centrifugal fluid machine.