Thermal shield for steam turbines

Details Thermal shield for steam turbines Thermal shield for steam turbines

1990-06-21

1992-07-28

Look, Edward K.

Rotary kinetic fluid motors or pumps

Including heat insulation or exchange means

415108, F01D 508

Patent

active

051336405

ABSTRACT:
A thermal shield for a steam turbine inner cylinder surrounding a plurality of turbine blade stages and having an outer cylinder substantially enclosing the inner cylinder. A steam inlet is connected to the inner cylinder through an outer cylinder for admitting high temperature steam into the inner cylinder to effect rotation of the turbine blade stages and a steam exit emits cooled steam from the inner cylinder into a space between the inner and outer cylinders. The shield reduces thermal stress on the inner cylinder from contact on an inner surface with the high temperature steam and contact on an outer surface with the cooled steam. The thermal shield is attached to the outer surface of the inner cylinder and spaced therefrom by a predetermined spacing. The thermal shield extends about all surfaces of the inner cylinder and forms a substantially closed inner space between the shield and the inner cylinder to prevent the flow of the cooled steam over the outer surface of the inner cylinder.

REFERENCES:
patent: 3915581 (1975-10-01), Brandstatter
patent: 4102598 (1978-07-01), Stock et al.
patent: 4149832 (1979-04-01), Sivolap et al.
patent: 4863341 (1989-09-01), Groenendaal
patent: 4915581 (1990-04-01), Groenendaal, Jr. et al.

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