Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing with mounting means
Reexamination Certificate
2002-06-06
2004-09-21
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing with mounting means
C248S671000
Reexamination Certificate
active
06793458
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a turbine assembling and transporting frame capable of assembling a turbine on a frame and transporting the turbine as it is and a turbine assembling method and a turbine transporting method using the frame, particularly to a turbine assembling and transporting frame preferable for assembling and transporting a high pressure turbine, a high and intermediate pressure integral turbine or the like of a steam turbine and a turbine assembling method and a turbine transporting method using the frame.
2. Description of the Related Art
In recent years, in order to easily install a power generating equipment mainly of a small-sized class or an intermediate-sized class at a site of a destination of export or the like, there has been frequently adopted integral transporting and assembling for previously assembling a turbine in a factory and delivering the turbine in a completely assembled state substantially finished with confirmation and adjustment of clearances between a stationary portion and a rotary portion. For example, it is disclosed in Japanese Non-examined Patent Publications No. 7-102906, No. 5-149107 and No. 62-267505.
First, an explanation will be given of an outline of a constitution of a turbine constituting an object of applying the conventional technology and this invention. A turbine
1
exemplified in
FIG. 7
is a high and intermediate pressure integral turbine of a steam turbine and is composed of a casing
2
constituting a stationary portion and a rotor
3
constituting a rotary portion in gross classification. The casing
2
is constituted by upper and lower divided members, that is, a casing lower half portion
4
and a casing upper half portion
5
. Similarly, the casing lower half portion
4
is constituted by an outer casing lower half portion
4
a
and an inner casing lower half portion
4
b
assembled inside of the outer casing portion
4
a
, and the casing upper half portion
5
is constituted by an outer casing upper half portion
5
a
and an inner casing upper half portion
5
b
assembled inside of the outer casing upper half portion
5
a
. The inner casing lower half portion
4
b
and the inner casing upper half portion
5
b
are respectively assembled with nozzles
6
each having an upper and lower divided portion constituting a stationary part for regulating and guiding flow of steam to the rotor
3
.
Next, an explanation will be given of the conventional technology with regard to assembling and transporting the turbine
1
in reference to FIG.
8
through FIG.
10
.
FIG. 8
is a perspective view showing a constitution of a conventional turbine assembling equipment, and
FIG. 9
is a sectional view showing to enlarge a portion the equipment of FIG.
8
.
As shown in FIG.
7
and
FIG. 8
, in assembling the turbine
1
, conventionally, there has been frequently used a base level block
11
constituting an article of a factory facility as a frame for assembling and supporting the turbine
1
. The base level block
11
is in a shape of a large-sized block, for example, a box-like shape, and an upper face of the base level block is made as a horizontal receive face
12
, and at least one pair of the base level block
11
are arranged at positions of two ends of the casing
2
in a turbine shaft direction. In
FIG. 8
, only one of the pair of base level blocks
11
is shown. Each bearing standard
14
is installed to the basic level block
11
, and thus the assembling of the turbine is performed. Each bearing standard
14
has a pair of casing support bases
13
separately arranged for supporting the casing
2
and half-ring-like receive member
18
on which a bearing
19
for supporting a rotating rotor is placed, as main components, and the whole composes a welding structure. Thus, the bearing standard
14
has a function of supporting the casing and a function of supporting the rotor.
Each pair of casing support bases
13
supports the casing
2
to be assembled at two portions of the casing
2
interposing the rotor
3
at the positions of the respective end portions in the turbine shaft direction. Each casing supporting base
13
is constituted by, for example, in a shape of a parallelepiped block, having a fitting groove
15
an upper face of which is opened on one side of the supporting base
13
and a horizontal receive portion
16
with a flat upper face on the other side of the supporting base
13
. Further, a projected portion
4
c
projected downwardly from an end portion of the casing lower half portion
4
of the turbine
1
can be inserted into and held by the fitting groove
15
, and the end portion of the casing
2
after assembling can be mounted on and held by the horizontal receive portion
16
with the flat face, so that a shop assembly condition of the turbine
1
can be reproduced. Further, the bearing standard
14
has, for example, a constitution of holding a ring-like receive member
18
in a shape of a semicircular arc, an upper face of which is opened in a frame member
17
in a quadrangular shape in plane view, so that a lower half portion of a bearing
19
upwardly and downwardly divided in two can be fitted and held by this constitution. Further, in assembling, first, the casing lower half portion
4
is mounted on the casing support bases
13
. In this case, the projected portions
4
c
at the two portions of the respective end portions of the casing lower half portion
4
in the axial direction are respectively inserted into the fitting grooves
15
of a total of four pieces of the casing support bases
13
, symmetrically arranged with respect to the rotor shaft.
FIG. 9
shows a state of inserting a projected portion
4
c
into the fitting groove
15
. That is, each projected portion
4
c
of the casing lower half portion
4
is respectively inserted into and supported by the respective fitting groove
15
of the casing support base
13
in a state of being mounted on an assembly key
20
. And by adjusting a thickness of the assembly key
20
, a horizontal level of the casing lower half portion
4
is accommodated and the assembly is installed by coordinating the assembly in a relative positional relationship such that uniform load is applied. Further, the installed casing lower half portion
4
is assembled with parts on the lower half side in stationary parts of the nozzles
6
and the like upwardly and downwardly divided in two.
Thereafter, the bearing
19
shown in
FIG. 8
is supported by the bearing standard
14
, the rotor
3
is contained in the bearing
19
, clearances are measured, clearance values are made to be proper by adjusting positions of the stationary parts and the rotor
3
, and parts on the upper half side are assembled. Thereby, the rotor
3
can be held rotatably in a state of assembling the bearing
19
to the bearing standard
14
. Hence, finally, the casing upper half portion
5
is assembled to the casing lower half portion
4
, which are fastened by bolts to thereby finish assembling and the turbine
1
is completed. At this occasion, the casing lower half portion
4
is supported by the casing upper half portion
5
and, therefore, a running key
21
is inserted between the casing
2
and the receive portion
16
of the casing support base
13
and the previously inserted assembly key
20
is detached, so that the casing
2
is supported by the running key
21
. In this way, the casing
2
constituting the stationary portion and the rotor
3
constituting the rotary portion are assembled by corresponding support structures, respectively.
Further, at a site of installing the turbine such as a power station, the bearing standard
14
is installed to a concrete foundation or the like. Hence, the above-described assembled bearing
19
is detached from the rotor
3
and the rotor
3
is brought into a state of being held in the casing
2
. The detached bearing
19
is delivered separately from the assembled casing
2
. In this case, as a substitute for releasing support by the bearing
19
, the rotor
3
is fixed t
Hiyama Katsuhide
Kakizaki Makoto
Kawai Chikahiro
Matsuyama Kenzo
Takahashi Mitsuo
Foley & Lardner LLP
Kabushiki Kaisha Toshiba
Look Edward K.
White Dwayne J
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