Title of Invention

AN IMPROVED TOP GUIDE PAD STOP MADE OF STEEL PLATES MOULDED IN EPOXY FOR INSULATING IT FROM BEARING HOUSING OF HYDRO GENERATOR

Abstract In the new design of guide stop (Ref Fig. No.02), main consideration were to increase circulation of oil, proper bonding of insulation material and to eliminate complicated machining. In the new design instead of machining from a heavy block of steel it is made from six thick steel plate, which is trimmed and bent at both the ends to get the required size and shape of pad stop, without any machining. The pad stop made by bending the steel plate is moulded with epoxy fiber glass insulation to make it a monolithic mass. There is no danger of knocking down of the insulating from pad stop during working condition.
Full Text 2
FIELD OF INVENTION
This invention is related to an improved epoxy moulded type top guide pad stop
to restrict the circumferential movement of guide pad and also to keep the top
guide pad insulated from bearing housing of Hydro Generator.
BACKGROUND OF THE INVENTION
Top guide bearing is a main part of Hydro Generator which guides and supports
the rotating shaft (Ref. Figure No.03) and pad stop is provided to restrict the
circumferential movement of guide pads The guide pad stops are designed
such that these do not create any obstruction in the oil circulation path inside the
bearing housing, so as to maintain the temperature of guide bearing pads within
permissible limits. Further, to eliminate the circulation of shaft currents through
bearing pads and to avoid electrical pitting and damages of bearing pads, only
Top guide bearing pads needs to be insulated from the bearing housing. This
necessitates the provision of insulated guide pad stop for Top guide bearing of
Hydro Generators.
In the existing, pad stop having extremely complicated shape is machined from a
solid steel block number of machining operations to achieve desired shape of pad

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stop. For insulating it from bearing housing, insulated strips are glued to it on
both the sides of the guide pad stop (Ref Fig. No. 01).
OBJECTS OF THE INVENTION
It is therefore, an object of the present invention to propose an improved epoxy
moulded top guide pad stop to restrict circular movement of guide pad and to
keep the top guide pad insulated from bearing housing of Hydro Generators,
which eliminates the disadvantages of existing system (i.e. complicated
machining and gluing of insulation of pad stops).
Another object of the present invention is to propose an improved epoxy
moulded top guide pad stop which improves oil circulations and to keep the
uniform temperature gradient inside the housing.
A further object of the present invention is to propose an improved epoxy
moulded top guide pad stop which improves the bonding strength of insulation
with pad stop to avoid any chance of knock down of the insulation from the pad
stop during operation.

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A still further objection of the present invention is to propose an improved epoxy
moulded top guide pad stop which is easy to manufacture and less cost.
SUMMARY OF TH E INVENTION
In the new design of guide stop (Ref Fig. No.02), main consideration were to
increase circulation of oil, proper bonding of insulation material and to eliminate
complicated machining. In the new design instead of machining from a heavy
block of steel it is made from six thick steel plate, which is trimmed and bent at
both the ends to get the required size and shape of pad stop, without any
machining. The pad stop made by bending the steel plate is moulded with epoxy
fiber glass insulation to make it a monolithic mass. There is no danger of
knocking down of the insulating from pad stop during working condition.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING:
FIGURE-1: Shows a schematic diagram of conventional type pad stop and also
the required machining and bonding process of insulation in
(Prior Art).

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FIGURE-2: Shows a schematic diagram of new Design of epoxy moulded type
guide pad stop as per invention.
FIGURE-3: Shows a schematic diagram of arrangement of moulded type Pad
stop in working condition as per invention.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE
INVENTION
As shown in fig (2); the top guide pad stop comprising six mm thick bent plates
and two inserts (2, 2) in assembled condition. The top guide pad stop is
provided with two holes (3, 3) for inserting fastenable means, to be mounted
with guide bearing support ring (5) shown in Fig 3. The stop guide pad moulded
with epoxy fibre glass insulting material (4, 4) pad stop in assembled Fig: 3
shows a epoxy moulded pad stop in assembled condition with the guide bearing,
support Ring (5).

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WE CLAIM
1 An Improved moulded top guide pad stop to restrict the
circumferential movement of guide pad and to keep the top guide pad
insulated from bearing housing of Hydro Generators compnsing:-
- an invented U shaped member consisting of six mm thick bent steel
plate;
- two steel inserts (2, 2) welded with six mm thick plate (1);
- The top guide pad stop provided with two top holes (3, 3) through
which two fastenable means are inserted for mounting with guide
bearing support ring (5);

2 The pad stop as claimed in claim 1 wherein the bent steel plate and
steel inserts are moulded with epoxy fiber glass insulation (4, 4) to
make it a monolithic mass.
3 An Improved epoxy moulded top guide pad stop to restrict the
circumferential movement of guide pad and to keep the top guide pad

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insulated from bearing housing of Hydro Generators as substantially
illustrated and described herein along with accompanying drawings.

In the new design of guide stop (Ref Fig. No.02), main consideration were to
increase circulation of oil, proper bonding of insulation material and to eliminate
complicated machining. In the new design instead of machining from a heavy
block of steel it is made from six thick steel plate, which is trimmed and bent at
both the ends to get the required size and shape of pad stop, without any
machining. The pad stop made by bending the steel plate is moulded with epoxy
fiber glass insulation to make it a monolithic mass. There is no danger of
knocking down of the insulating from pad stop during working condition.

Documents:

00983-kol-2007-abstract.pdf

00983-kol-2007-claims.pdf

00983-kol-2007-correspondence others 1.1.pdf

00983-kol-2007-correspondence others.pdf

00983-kol-2007-description complete.pdf

00983-kol-2007-drawings.pdf

00983-kol-2007-form 1.pdf

00983-kol-2007-form 18.pdf

00983-kol-2007-form 2.pdf

00983-kol-2007-form 3.pdf

00983-kol-2007-gpa.pdf

983-KOL-2007-(02-05-2012)-CORRESPONDENCE.pdf

983-KOL-2007-(02-12-2011)-ABSTRACT.pdf

983-KOL-2007-(02-12-2011)-AMANDED CLAIMS.pdf

983-KOL-2007-(02-12-2011)-DESCRIPTION (COMPLETE).pdf

983-KOL-2007-(02-12-2011)-DRAWINGS.pdf

983-KOL-2007-(02-12-2011)-EXAMINATION REPORT REPLY RECIEVED.PDF

983-KOL-2007-(02-12-2011)-FORM-1.pdf

983-KOL-2007-(02-12-2011)-FORM-2.pdf

983-KOL-2007-(02-12-2011)-OTHERS.pdf

983-KOL-2007-(04-02-2013)-CORRESPONDENCE.pdf

983-KOL-2007-(04-02-2013)-OTHERS.pdf

983-KOL-2007-(11-07-2012)-CORRESPONDENCE.pdf

983-KOL-2007-(11-07-2012)-FORM-1.pdf

983-KOL-2007-(11-07-2012)-FORM-3.pdf

983-KOL-2007-(11-07-2012)-FORM-5.pdf

983-KOL-2007-(11-07-2012)-OTHERS.pdf

983-KOL-2007-(11-07-2012)-PA-CERTIFIED COPIES.pdf

983-KOL-2007-CORRESPONDENCE.pdf


Patent Number 260094
Indian Patent Application Number 983/KOL/2007
PG Journal Number 14/2014
Publication Date 04-Apr-2014
Grant Date 31-Mar-2014
Date of Filing 11-Jul-2007
Name of Patentee BHARAT HEAVY ELECTRICALS LIMITED
Applicant Address REGIONAL OPERATIONS DIVISION (ROD), PLOT NO: 9/1 DJBLOCK, 3RD FLOOR, KARUNAMOYEE, SALT LAKE CITY, KOLKATA-700091 BHEL HOUSE, SIRI FORT, NEW DELHI- 110049
Inventors:
# Inventor's Name Inventor's Address
1 SHRI HARIOM ATTRI HYDRO GENERATOR ENG. BHEL, BHOPAIL PIN-462021
2 SHRI JUGAL KISHORE BHATI HYDRO GENERATOR ENG. BHEL, BHOPAIL PIN-462021
3 SHRI HAZARILAL HYDRO GENERATOR ENG. BHEL, BHOPAIL PIN-462021
PCT International Classification Number F03B3/12; F03B3/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA