FIELD OF INVENTION:
The present invention relates to arrangement of rotor jacking system for bulb generator
of hydroelectric power plant. That is, the complete rotating system of generator and
turbine in standstill is lifted in horizontal condition. This arrangement is economical and
ease of assembly and dis-assembly during erection and maintenance.
BACKGROUND OF THE INVENTION:
Bulb type hydro generator has a horizontal shaft coupled to turbine of enclosed capsule
of steel structure placed in inline water stream for generation of electricity. The rotor of
such system is heavy mass that comprises of generator and turbine rotating parts
supported on two bearings. The rotor jacking system design is based on complete load of
rotating element acting on it by considering the system as simply supported beam on two
supports at location-1 and location-2.
The forces acting on this system is transmitted to the foundation. This system can be used
for following purposes:
a) To support the complete rotating system during erection and schedule
maintenance.
b) To lift the rotor during unit alignment process.
c) To hold the rotor during overhauling and maintenance of combined thrust cum
journal and support bearing.
The proposed design of rotor jacking system has been optimized for effective utilization
in bulb generators.
One or more drawbacks of conventional systems and process for a method for improving
yield strength of a workpiece and an apparatus are overcome, and additional advantages
are provided through the apparatus and a method as claimed in the present disclosure.
Additional features and advantages are realized through the technicalities of the present
disclosure. Other embodiments and aspects of the disclosure are described in detail herein
and are part of the claimed disclosure.
The foregoing summary is illustrative only and is not intended to be in any way limiting.
In addition to the illustrative aspects, embodiments, and features described above, further

aspects embodiments, and features will become apparent by reference to the drawings
and the following detailed description.
OBJECTS OF THE INVENTION:
Considering the above criteria, following analysis have been envisaged to determine the
objective of invention:
It is an object of the invention to propose an arrangement of rotor jacking system to
support the rotating system of bulb generator for ease of erection & maintenance.
Another object of the invention is to transmit the forces acting on it to the foundation
during standstill condition.
Further object of the invention is to make the arrangement compact, economical and ease
of assembly during handling.
SUMMARY OF THE INVENTION
Various objects, features, aspects, and advantages of the inventive subject matter will
become more apparent from the following detailed description of preferred embodiments,
along with the accompanying drawing figures in which like numerals represent like
components.
It is to be understood that the aspects and embodiments of the disclosure described
above may be used in any combination with each other. Several of the aspects and 10
embodiments may be combined to form a further embodiment of the disclosure.
A rotor jacking system for bulb generator that comprises of - a first brake jack (1) assembly
affixed to a support by fastening means the assembly further comprising of a base plate
(2) over which a pipe (11) and four numbers ribs (3) are welded at 90° apart around the
pipe (11) periphery and a round block (4); a jack screw (5) coupled to a jack rod (6)
coupled to a hard wool felt (9) wherein the said brake jack is placed at a first location
(XX) ; and - a second brake jack (10) assembly affixed to a support by fastening means
the assembly further comprising of a base plate (12) over which a pipe (21) and four
numbers ribs (13) are welded at 90° apart around the pipe (21) periphery and a round
block (14); a jack screw (15) coupled to a jack rod (16) further coupled to jack plate (20)
a hard wool felt (17) wherein the said brake jack is placed at a second location (YY);

wherein each of the brake jack (1,10) axially moves upward and downward thereby
placing the rotor at desired height. Adjustment of height done by jack screw (5) & (19).
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
It is to be noted, however, that the appended drawings illustrate only typical embodiments
of the present subject matter and are therefore not to be considered for limiting of its
scope, for the invention may admit to other equally effective embodiments. The detailed
description is described with reference to the accompanying figures. In the figures, the
left-most digit(s) of a reference number identifies the figure in which the reference number
first appears. The same numbers are used throughout the figures to reference like features
and components. Some embodiments of system or methods in accordance with
embodiments of the present subject matter are now described, by way of example, and
with reference to the accompanying figures, in which
The invention can be described in detail with the help of the figures in
accompanying drawings:
Figure 1 illustrates a rotor jacking arrangement in accordance to the invention.
Figure 2 illustrates Section-XX, rotor jacking system at location-1 in accordance to the
invention.
Figure 3 illustrates Section-YY, rotor jacking system at location-2 in accordance to the
invention.
Figure 4 illustrates rotor jacking system item in accordance to the invention.
The figures depict embodiments of the present subject matter for the purposes of
illustration only. A person skilled in the art will easily recognize from the following
description that alternative embodiments of the structures and methods illustrated herein
may be employed without departing from the principles of the disclosure described herein.
DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS:
It should be noted that the description and figures merely illustrate the principles of the
present subject matter. It should be appreciated by those skilled in the art that conception
and specific embodiment disclosed may be readily utilized as a basis for modifying or
designing other structures for carrying out the same purposes of the present subject
matter. It should also be appreciated by those skilled in the art that by devising various

arrangements that, although not explicitly described or shown herein, embody the
principles of the present subject matter and are included within its spirit and scope.
Furthermore, all examples recited herein are principally intended expressly to be for
pedagogical purposes to aid the reader in understanding the principles of the present
subject matter and the concepts contributed by the inventor(s) to furthering the art and
are to be construed as being without limitation to such specifically recited examples and
conditions. The novel features which are believed to be characteristic of the present
subject matter, both as to its organization and method of operation, together with further
objects and advantages will be better understood from the following description when
considered in connection with the accompanying figures.
As used in the description herein and throughout the claims that follow, the meaning of
“a”, “an” and “the” includes plural reference unless &e context clearly dictates otherwise.
Also, as used in the description herein, the meaning of “in”' includes “in” and “on” unless
the context clearly dictates otherwise.
The terms "comprises", “comprising”, or any other variations thereof used in the
disclosure, are intended to cover a non-exclusive inclusion, such that a device, system,
assembly that comprises a list of components does not include only those components but
may include other components not expressly listed or inherent to such system, or
assembly, or device. In other words, one or more elements in a system or device
proceeded by “comprises... a” does not, without more constraints, preclude the existence
of other elements or additional elements in the system, apparatus or device.
These and other advantages of the present subject matter would be described in greater
detail with reference to the following figures. It should be noted that the description merely
illustrates the principles of the present subject matter. It will thus be appreciated that
those skilled in the art will be able to devise various arrangements that, although not
explicitly described herein, embody the principles of the present subject matter and are
included within its scope.
Figure 1 shows a rotor jacking system.
Figure 2 shows the rotor jacking system mounted at location-1. At location-1, brake jack
(1) assembly is fixed to steel support structure of bulb with the help of screw (7) and
washer (8). The steel support structure is place on concrete foundation. The stool support
assembly is so fabricated for providing adequate stiffness to it. This assembly comprises

of base plate (2) at the bottom over which pipe (11) and four numbers ribs (3) are welded
to the base plate (2) at 90° apart around the pipe (11) periphery and round block (4) is
placed at the top, which is welded to rib (3) and pipe (11). The stool support assembly is
placed over the brake jack (1) on base plate (2) which has rectangular slot at the bottom.
The round block (4) has internal threading throughout its length. The jack screw (5) with
external threading is assembled with the round block (4). The jack screw (5) has a collar
at certain distance from top face with holes drilled on the outer periphery of collar. These
holes are used to rotate the jack screw (5) which will facilitate its axial movement up and
down. The jack rod (6) is assembled to jack screw (5) with the help of counter bore at the
bottom of jack rod (6). The top face of jack rod (6) of radius similar to the radius of the
shaft collar outer diameter. Hard wool felt (9) is placed in between shaft and jack rod (6)
which will protect the surface of shaft collar outer diameter. For uniform loading, the
surface contact has been maintained between them.
Figure 3 shows the rotor jacking system mounted at location-2. At location-2, brake jack
(10) assembly is fixed to steel support structure of bulb with the help of screw (15) and
washer (16). The steel support structure is place on concrete foundation. The stool support
assembly is so fabricated for providing adequate stiffness to it. This assembly comprises
of base plate (12) at the bottom over which pipe (21) and four numbers ribs (13) are
welded to the base plate (12) at 90° apart around the pipe (21) periphery and round block
(14) is placed at the top, which is welded to rib (13) and pipe (21). The stool support
assembly is placed over the brake jack (10) on base plate (12) having rectangular slot at
the bottom. The round block (14) has an internal threading throughout its length. The
jack screw (19) with external threading is assembled with the round block (14). The jack
screw (19) has a collar at certain distance from top face with holes drilled on the outer
periphery of collar. These holes are used to rotate the jack screw (19) which will facilitate
its axial movement up and down. The jack plate (20) is assembled to jack screw (19) with
the help of counter bore at the bottom of jack plate (20). The top face of jack plate (20)
has a radius, which is matching with the radius of the shaft outer diameter. Hard wool felt
(17) is placed in between shaft and jack plate (20) which will protect the surface of shaft
outer diameter.
The brake jack (1) & (10) piston can move axially upward to certain length as desired
during operation of rotor jacking system. Brake jack (1) & (10) is operated with the help

of hydraulic power pack connected to it through hose pipe. The complete assembly can
be assembled to certain height to facilitate the movement of brake jack (1) & (10) piston.
The load from shaft via rotor jacking system is transferred to support structure and in turn
to foundation.
Hence, optimized, cost effective and stout design of rotor jacking system has been
developed for jacking purpose in bulb generator.
Each of the appended claims defines a separate invention, which for infringement
purposes is “reorganized as including equivalents to the various elements or limitations
specified in the claims. Depending on the context, all references below to the “invention”
may in some cases refer to certain specific embodiments only. In other cases, it will be
recognized that references to the “invention” will refer to subject matter recited in one or
more, but not necessarily all, of the claims.
Groupings of alterative elements or embodiments of the invention disclosed herein are not
to be construed as limitations. Each group member can be referred to and claimed
individually or in any combination with other members of the group or other elements
found herein. One or more members of a group can be included in, or deleted form, a
group for reasons of convenience and/or patentability. When any such inclusion or deletion
occurs, the specification is herein deemed to contain the group as modified thus fulfilling
the written description of all groups used in the appended claims.
With respect to the use of substantially plural and/or singular terms herein, those having
skill in the art can translate form the plural to the singular and/or from the singular to the
plural as is appropriate to the context and/or application. The various singular/plural
permutations may be expressly set forth herein for sake of clarity.
It still be understood by takes within the art that in general, terms used herein, and
especially in the appended claims (e.g, bodies of the appended claims) are generally
intended as “open” terms (eg, the term “including” should be interpreted as “including but
not limited to,” the term “having” should be interpreted as “having at least”, the term
“includes” should be interpreted as “includes but is not limited to” etc.)- It will be further
understood by those within the art that if a specific number of an introduced claim
recitation is intended, such an intent will be explicitly recited in the claim, and in the
absence of such recitation no such intent is present. For example, as an aid to
understanding, the following appended claim may contain usage of the introductory

phrases “at least one” and “one or more” to introduce claims recitations. However, the
use of such phrases should not be construed to imply that the introduction of a claim
recitation by the indefinite articles “a” or “an” limits any particular claim containing such
introduced claim recitation to inventions containing only one such recitation, even when
the same claims includes the introductory phrases “one or more” or “at least one” and
indefinite articles such a “a” or “an” (e.g, “a” and/or “an” should typically be interpreted
to mean “at least one” or “one or more”); the same holds true for the use of definite article
used to introduce claim recitations. In addition, even if a specific number of an introduced
claim recitation is explicitly recited, those skilled in the art will recognize that such
recitation should typically be interpreted to mean at least the recited number (e.g the bare
recitation of “two recitation,” without other modifiers, typically mean at least two
recitations, or two or more recitations). Furthermore, in those instances where a
convention analogous to “at least one of the A, B and C, etc.” is used, in general such a
construction is intended in the sense one having skill in the art would understand the
convention (eg. “a system having at least one A, B and C etc. would include but not be
limited to systems that have A alone, B alone, C alone, A and B together, A and C together,
B and C together, and/or A, B and C together etc.). In those instances , where a convention
analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is
intended in the sense one having skill in the art would understand the convention (e.g.,
“a system having at least one of A, B or C” would include but not be limited to systems
that have A alone, B alone, C alone, A and B together, A and C together, B and C together
and/or A, B and C together etc.). It will be further understood by those within the art that
virtually any disjunctive word and/or phrase presenting two or more alternative terms,
whether in the description, claims, or drawings, should be understood to contemplate the
possibilities of including one of the terms, either of the terms or both terms. For example,
the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and
B”.
The above description do not provide specific details of manufacture or design of the
various components. Those of skill in the art are familiar with such details, and unless
departures from those techniques are set out, techniques, known related art or later
developed deigns and materials should be employed. Those in the art are capable of
choosing suitable manufacturing and design details.

The technology used herein is for the expose of describing particular embodiments only
and is not intended to be limiting of the present disclosure. It will be appreciated that
several of the above-disclosed and other features and functions, or alternative thereof,
may be combined into other systems or application. Various presently unforeseen or
unanticipated alternatives, modification, variation, or improvements therein.
ADVANTAGES:
The advantages of the proposed design of rotor jacking system are as follows:
1. The designed rotor jacking arrangement is rigid enough for transmission of forces
to foundation.
2. It provides sufficient flexibility between connected structures.
3. Easier to install and dismantle during erection and maintenance because of simple
construction.
4. The optimized design of is economical.

LIST OF REFERENCE NUMERALS:
1 & 10 BRAKE JACK
2 & 12 BASE PLATE
3 & 13 RIB
4 & 14 ROUND BLOCK
5 & 19 JACK SCREW
6 JACK ROD
7 & 15 SCREW
8 & 16 WASHER
9 & 17 HARD WOOL FELT
11 & 21 PIPE
20 JACK PLATE

WE CLAIM:
1. A rotor jacking system for bulb generator that comprises of
- a first brake jack (1) assembly affixed to a support by fastening means the
assembly further comprising of a base plate (2) over which a pipe (11) and four
numbers ribs (3) are welded at 90° apart around the pipe (11) periphery and a
round block (4); a jack screw (5) coupled to a jack rod (6) coupled to a hard wool
felt (9) wherein the said brake jack is placed at a first location (XX) ; and
- a second brake jack (10) assembly affixed to a support by fastening means the
assembly further comprising of a base plate (12) over which a pipe (21) and four
numbers ribs (13) are welded at 90° apart around the pipe (21) periphery and a
round block (14); a jack screw (15) coupled to a jack rod (16) further coupled to
jack plate (20) a hard wool felt (17) wherein the said brake jack is placed at a
second location (YY);
wherein each of the brake jack (1,10) axially moves upward and downward thereby
placing the rotor at desired height and adjustment of height is done by jack screw
(5) & (19).
2. The rotor jacking system for bulb generator as claimed in claim 1, wherein base
plate (2, 12) is welded to rib (3,13) which is welded to a block (4).
3. The rotor jacking system for bulb generator as claimed in claim 1, wherein jack rod
(6) is assembled to jack screw (5), which supports the rotor complete at location
(XX).
4. The rotor jacking system for bulb generator as claimed in claim 1, wherein jack
plate (20) is assembled to jack screw (19), which supports the rotor complete at
location (YY).
5. The rotor jacking system for bulb generator as claimed in claim 1, wherein the jack
plate at second location is of the same radius as the shaft and for uniform loading,
surface contact has been maintained between them.

6. The rotor jacking system for bulb generator as claimed in claim 1, wherein top of
the jack rod (6) at first location is of the same radius as the shaft collar and for
uniform loading, surface contact has been maintained between them.