Rotary kinetic fluid motors or pumps – Including casing part selectively movable relative to fixed...
Reexamination Certificate
1999-11-01
2001-03-20
Verdier, Christopher (Department: 3745)
Rotary kinetic fluid motors or pumps
Including casing part selectively movable relative to fixed...
C415S213100, C029S889100
Reexamination Certificate
active
06203270
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method of transporting a steam turbine and a device for aiding the transportation of a steam turbine.
DESCRIPTION OF THE RELATED ART
In general, a steam turbine includes a rotor and a casing for enclosing the rotor. A pair of bearing boxes, which enclose bearings for rotationally supporting the opposite ends of the rotor, are provided on the opposite end portions of the rotor.
The casing includes a steam inlet through which steam is directed to turbine portions which are symmetrically provided on either side of the rotor. Each of the turbine portions includes multistage stationary and moving blades provided around and along the rotor.
In the prior art, in order to transport a steam turbine, the steam turbine must be disassembled because the rotor is not rigidly connected to the casing so that a relational movement between the casing and rotor is caused when the assembled steam turbine is lifted for transportation.
SUMMARY OF THE INVENTION
The invention is directed to solve the above mentioned prior art problems, and the objective of the invention is to provide an improved method of transporting a steam turbine, and a device for aiding the transportation of a steam turbine which allow the steam turbine to be transported without disassembling the turbine.
The invention provides a method of transporting a steam turbine which includes a rotor extending along a longitudinal axis and having multistage stationary and moving blades, a casing, supported by a base structure, for enclosing the rotor, bearings for rotationally supporting the rotor, and a pair of glands for sealing between the casing and the rotor, the casing including longitudinally opposite side flanges, the glands being mounted onto gland portions which are provided on the respective sides of the rotor outside of the casing and attached to the respective side flanges of the casing through a pair of flexible members. The method comprises the steps of removing the glands from the rotor; mounting restrainers to the rotor where the glands had been mounted and to the side flanges of the casing whereby the rotor and the casing are connected to each other to limit the relative movement therebetween and the restrainers bear the weight of the rotor with the bearings; and transporting the casing and the rotor with the bearings coupled to the rotor.
According to another feature of the invention, there is provided a device for aiding transportation of a steam turbine which includes a rotor extending along a longitudinal axis and having multistage stationary and moving blades, a casing, supported by a base structure, for enclosing the rotor, bearings for rotationally supporting the rotor, and a pair of glands for sealing between the casing and the rotor, the casing including longitudinally opposite side flanges, the glands being mounted onto gland portions which are provided on the respective sides of the rotor outside of the casing and attached to the respective side flanges of the casing through a pair of flexible members. The device comprises restrainers which are adapted to replace the glands after the glands are removed from the rotor and the casing. The restrainers are fitted onto the rotor where the glands had been mounted, and secured to the side flanges of the casing whereby the rotor and the casing are connected to each other to limit the relative movement therebetween and the restrainers bear the weight of the rotor with the bearings.
According to the invention, when lifting the steam turbine, the restrainers radially and axially hold the rotor and bear the weight of the rotor and the bearing boxes.
REFERENCES:
patent: 4928911 (1990-05-01), Hardtke
patent: 4951902 (1990-08-01), Hardtke
Mitsubhisi Heavy Industries, Ltd.
Verdier Christopher
Wallenstein & Wagner Ltd.
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