Turbocharger with a double-vane nozzle system

Abstract

Disclosed is a turbocharger with a dual-blade nozzle system, comprising a turbine housing, a fixed nozzle ring ( 1 ), a linearly moving nozzle disk ( 2 ), a mid-housing ( 5 ), a rack ( 4 ), rocker arm rods ( 3 ), and a gear ( 6 ), wherein airfoil-shaped fixed blades ( 8 ) are provided on the front end face of the fixed nozzle ring ( 1 ), with blade-type holes ( 9 ) provided between the fixed blades ( 8 ), and the fixed nozzle ring ( 1 ) is sheathed around the outside of the mid-housing ( 5 ) and fixed to the mid-housing ( 5 ) via screws; the linearly moving nozzle disk ( 2 ) is provided on the rear end of the fixed nozzle ring ( 1 ), a group of moving blades ( 7 ) is provided on the front end face of the linearly moving nozzle disk ( 2 ), the moving blades ( 7 ) are movably inserted into the blade-type holes ( 9 ), the rear end face of the linearly moving nozzle disk ( 2 ) is fixedly connected to two rocker arm rods ( 3 ), with the rocker arm rods ( 3 ) inserted into the mid-housing ( 5 ) and engaged with the rack ( 4 ) via the gear ( 6 ). The provision of an additional blade along a nozzle flow passage in the turbocharger with the dual-blade nozzle system can not only reduce the cross-sectional area of the passage, but also separate the original nozzle into two gas passages to reduce the loss of gas flow due to transverse flow; in addition, the gas flow can flow at an optimum gas flow angle according to the original design, so that the turbine can keep working in the high efficiency region.

1 . A turbocharger with a double-vane nozzle system, comprising a turbine housing, characterized in that it further comprises a fixed nozzle ring, a linearly moving nozzle disk, a middle-housing, a rack, a gear and rocker arm rods,
 wherein a plurality of airfoil shape fixed vanes are provided on a front end face of the fixed nozzle ring, with blade-shaped holes arranged between the fixed vanes, the fixed nozzle ring is provided with a center hole at the center, and sheathed around circumference of a middle-housing and fixed to the middle-housing via screws, a linearly moving nozzle disk is mounted to a rear end of the fixed nozzle ring, a plurality of moving blades is provided on a front end face of the linearly moving nozzle disk, and the shape of the moving blade is consistent with that of the blade-shaped hole, the moving blades are movably inserted into the blade-shaped holes, the linearly moving nozzle disk is provided with a center hole at its center and sheathed around the circumference of the middle-housing, the rear end face of the linearly moving nozzle disk is fixedly connected with two rocker arm rods, the rocker arm rods are inserted into the middle-housing, each of the rocker arm rods is provided with teeth at one end and engaged with a rack via the gear, the rack is connected to a driving device.   
     
     
         2 . The turbocharger with a double-vane nozzle system according to  claim 1 , characterized in that an intake angle of the blade is ranged from about 18 to 24 degrees. 
     
     
         3 . The turbocharger with a double-vane nozzle system according to  claim 1 , characterized in that 4 to 11 fixed vanes are employed and 4 to 11 moving blades are employed. 
     
     
         4 . The turbocharger with a double-vane nozzle system according to  claim 1 , characterized in that the driving device connected to the rack is an air packet executor or a solenoid valve.