EXHAUST HOOD FOR LOW-PRESSURE STEAM TURBINE

摘要

PROBLEM TO BE SOLVED: To reduce the output of a turbine, and to restrict the exciting force of a rotor blade by providing a lower wheel chamber forming an exhaust hood of a low- pressure steam turbine with a vertical rib to be bonded to an end wall of the lower wheel chamber in the downstream of an annular diffuser, and providing an outside vertical rib to be bonded to the outside of the end wall of the lower wheel chamber and a bearing housing. ;SOLUTION: In an exhaust hood for low-pressure steam turbine, the steam flow 3 passed through a final stage rotor blade 2 arrives at annular diffusers 6a, 6b surrounded by a flow guide 4 and a bearing cone 5. The steam flow 3 in the upper wheel chamber side is led to the lower wheel chamber 9 through a space surrounded by the upper wheel chamber 7 and an inner wheel chamber 8, and the steam flow 3 of the lower wheel chamber side is directly flowed into the lower wheel chamber 9, and finally, both the flows from the upper and the lower wheel chambers 7, 9 are joined and discharged to a steam condenser. In this case, as a strength member for the lower wheel chamber 9, a vertical rib 10 is arranged in the downstream of the annular diffuser 6a with a sufficient distance, and the vertical rib 10 is welded for bonding to the end wall 9a of the lower wheel chamber 9. A vertical rib 14 is also provided, and welded for bonding to the bearing housing 12 and the outside of the end wall 9a.;COPYRIGHT: (C)2000,JPO