Hitachi, Ltd.

Other

Yoshiharu Ueyama

Yoshihiro Nagaoka

Sadashi Tanaka

Yukiji Iwase

Michiaki Ida

Hirotoshi Ishimaru

Tetuya Yoshida

Saburo Iwasaki

Yasushi Takano

Michiyuki Takagi

Tetsuya Yoshida

Koji Hayashi

Akiomi Kohno

Kazuaki Yokoi

Keiji Taguchi

Hiroshi Misumi

Kazuyuki Koide

Setsuo Yazawa

Yuuji Nagai

In a fluidal machine with an impeller rotating to urge a fluid radially outwardly by a centrifugal force, a vane guiding the fluid discharged from the impeller, a vane member which includes a front end of the vane facing to the impeller so that the fluid discharged from the impeller strikes against the front end and which is prevented from contacting the atmosphere, and a casing surrounding the vane member and contacting the atmosphere, the vane member is discrete from the casing, a vibration propagation between the vane member and the casing is prevented or restrained, and a vibration of a pipe extending from the casing is absorbed.

Fluidal machine

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.

Centrifugal fluid machine

At a volute casing of a centrifugal fluid machine, pressure pulsation and vibrating forces acting upon 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 volute,fixed to the casing,is constructed such that radius of the vane trailing edge of the impeller,and 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 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.

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.

Centrifugal type fluid machine

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 3 rotating about a rotating shaft 2 within a casing 1 and having a vaned diffuser 4 or volute 12 fixed to the casing 1 is constructed such that radius of the vane trailing edge of the impeller 3 and radius of the vane leading edge of the diffuser 4 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 3 and the vane leading edge of the diffuser 4 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.

A vane member comprises a first member and a second member, the first member and the second member are joined by that an insert member whose melting temperature is lower than melting temperatures of the first and second members contacts the first and second members, the insert member is heated to a welding temperature which is lower than the melting temperatures of the first and second members and is higher than the melting temperature of the insert member so that a mutual diffusion between at least an original base component of the insert member and at least an original base component of the first member different from the original base component of the insert member and a mutual diffusion between at least the original base component of the insert member and at least an original base component of the second member different from the original base component of the insert member are caused by the heating, and the mutual diffusions by the heating are continued at least until the original base component of the insert member is replaced by at least one of the original base components of the first member and the second member and the at least one of the original base components of the first member and the second member becomes a substitute base component of the insert member.

Vane member and method for producing joint

At 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 3 rotating about a rotating shaft 2 within a casing 1 and having a volute 12 fixed to the casing 1 is constructed such that radius of the vane trailing edge of the impeller 3 and 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 3 and the leading edge of 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.

Growing community of inventors

Tsukuba, Japan

Yoshiharu Ueyama