Steam turbine

Details Steam turbine Steam turbine

2000-02-01

2001-10-16

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

C415S150000, C415S157000, C415S159000, C415S202000, C415S915000

Reexamination Certificate

active

06302644

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a steam turbine with regulation of the fresh steam flow.
BACKGROUND OF THE INVENTION
Steam turbines with nozzle section regulation, in which the first turbine stage, also called the control stage, of the steam turbine is equipped with a plurality of admission sectors, whose steam flow can be set by a specific control valve in each case are known. In such steam turbines, there are in each case at least three or more control valves.
Steam turbines without nozzle section regulation or without a control stage are also known. Such steam turbines are constructed with at least one control valve up to 180 MW, with two control valves up to 600 MW and with four control valves over 600 MW.
The turbine casings of steam turbines with a control stage are constructed differently in design terms than the turbine casings of steam turbines without a control stage.
SUMMARY OF THE INVENTION
The invention is based on the object of achieving a reduction in the casting models and the modules, especially for the turbine casings, and as a result achieving lower refitting times and lower costs.
According to the invention, this is achieved in that the number of control valves for regulating the fresh steam flow on a steam turbine with a control stage is identical to that for one without a control stage, there being at least two control valves, and in that the turbine outer casing of a steam turbine with a control stage is of identical design, at least in the region of the fresh steam inlet section, to one without a control stage.


REFERENCES:
patent: 3190612 (1965-06-01), Conrad, Sr. et al.
patent: 3350061 (1967-10-01), Strass
patent: 4642025 (1987-02-01), Heiniger et al.
patent: 5695317 (1997-12-01), Ritter
patent: 852 247 (1952-08-01), None
patent: 44 25 352 (1996-01-01), None
patent: 44 25 353 (1996-01-01), None
patent: 478810 (1938-01-01), None
patent: 63-38605-A (1988-02-01), None

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