Patent ID: 7165943
Filing Date: 2007-01-23
Classification: F01D,F02C,F05D,Y02T

Abstract:
1. A geothermal turbine, comprising: a turbine casing; a turbine rotor shaft; a plurality of nozzle diaphragm outer rings fixed to the turbine casing; a plurality of nozzle diaphragm inner rings located radially inside the nozzle diaphragm outer rings; a plurality of nozzles placed between the nozzle diaphragm outer rings and the nozzle diaphragm inner rings, which form a steam passage; and a plurality of rotor blades mounted on the turbine rotor shaft, which face the nozzles and form a blade cascade in a circumferential direction; wherein the rotor blade includes a plurality of cover pieces connecting tip portions of adjacent blades, each cover piece including a first tenon protruding from one side of the cover piece and a first tenon hole on opposite side of the cover piece, the first tenon being inserted into a second tenon hole arranged on a tip portion of a first blade, and a second tenon protruding from a second blade next to the first blade being inserted into the first tenon hole, whereby the blade is continuously coupled 360 degrees around the wheel.