Radial turbine

Abstract

The present invention provides a radial turbine which uses a fluid having a plurality of pressures in a single turbine wheel, to thereby reduce the number of components and lower the cost. A radial turbine ( 100 ) includes a single radial turbine wheel ( 15 ) which converts, into rotational power, swirling energy of a swirling fluid with a first pressure that flows into the radial turbine wheel ( 15 ) from a main inlet ( 21 ) formed at an outer circumferential end through a nozzle ( 27 ) with a radial flow velocity component, wherein a sub inlet ( 29 ) is formed on an outer circumferential side of the radial turbine wheel ( 15 ) at a position radially and axially apart from the main inlet ( 21 ), and the low-boiling-point medium whose pressure decreases from the first pressure as the low-boiling-point medium travels to a radial inner side flows into the sub inlet ( 29 ) through a nozzle ( 35 ).

1 . A radial turbine comprising a single turbine wheel which converts, into rotational power, swirling energy of a swirling fluid with a first pressure that flows into the turbine wheel from a main inlet formed at an outer circumferential end through a high-speed swirling flow generating flow passage such as a nozzle and a scroll with a radial flow velocity component as a main component,
 wherein a single or a plurality of sub inlets are formed on an outer circumferential side of the turbine wheel at positions radially and axially apart from the main inlet and each other, and   swirling fluid whose pressure gradually decreases from the first pressure as fluid travels to a radial inner side flows into each of the sub inlets through a high-speed swirling flow generating flow passage such as a nozzle and a scroll.   
     
     
         2 . The radial turbine according to  claim 1 , wherein a shroud is provided between the main inlet and the sub inlet located on an outermost side in the turbine wheel. 
     
     
         3 . The radial turbine according to  claim 1 , wherein a shroud is provided between the respective sub inlets in the turbine wheel. 
     
     
         4 . The radial turbine according to  claim 1 , wherein a shroud is provided between the sub inlet located on an innermost side and a discharge section in the turbine wheel. 
     
     
         5 . The radial turbine according to  claim 2 , wherein a shroud is provided between the respective sub inlets in the turbine wheel. 
     
     
         6 . The radial turbine according to  claim 2 , wherein a shroud is provided between the sub inlet located on an innermost side and a discharge section in the turbine wheel. 
     
     
         7 . The radial turbine according to  claim 3 , wherein a shroud is provided between the sub inlet located on an innermost side and a discharge section in the turbine wheel. 
     
     
         8 . The radial turbine according to  claim 5 , wherein a shroud is provided between the sub inlet located on an innermost side and a discharge section in the turbine wheel.