FIELD OF INVENTION
The present invention generally relates to a centre holder for axial support of turbine
rotors. More particularly, the present invention relates to a centre holder for axial
support of turbine rotors to withstand heavy axial load while rotating along with the
rotor.
BACKGROUND OF THE INVENTION
At present the rotor axial support is fixed up by mounting a rotating centre on the face
of an angle plate having clamped on the table of machine. The axial load on rotor is
generated due to flexible coupling on the machine and due to lack of care in the
existing system which causes enormous load on angle plate. Since the rotating centre is
a loose part and has no axial movement for setting. The whole process of setting the
centre with rotor is a repetitive process consuming a lot of time.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to propose a centre holder for axial
support of turbine rotors which eliminates the disadvantage of the prior art.
Another object of the present invention is to propose a centre holder for axial support
of turbine rotors which can withstand the axial load of turbine rotors.
A further object of the present invention is to propose a centre holder for axial support
of turbine rotors which rotates centre part along with rotor rotation.
A still further object of the present invention is to propose a centre holder for axial
support of turbine rotors which has axial movement for easy setting.
An yet further object of the present invention is to propose a centre holder for axial
support of turbine rotors which reduces the assembly and fitting time after the rotor is
loaded on the machine.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.l - shows the diagram of prior art
Fig.2 - shows the construction of centre holder according to the present invention
Fig.3 - shows Detail A of centre holder as shown in Fig.2 according to an embodiment
of the present invention
Fig.4 - shows the View B of the centre holder as shown in Fig.3 according to present
invention
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE PRESENT
INVENTION
Fig.l shows the diagram of prior art which comprises of an angle plate clamped on the
bed plate of machine after fitting a rotating centre on the centre of rotor and butting
with the face of angle plate.
Fig.2 shows the structure of the centre holder comprising of a fabricated stand with
centre holder fitted (welded) on top.
Fig.3 shows a centre holder having a cylindrical configuration which comprises of a
cylindrical shaft (1). The cylindrical shaft (1) having a conical shaped front end which is
fitted with a flange (3) by a plurality screws (2). The flange (3) is guided with a special
flange (4) which is clamped with a spindle sleeve (5) with a plurality of screws (6)
inside the housing (7). The shaft (1) is supported by a plurality ball bearings (8) for
easy rotation disposed in between one, inner bush (9) and one outer bush (10) that are
fitted inside the spindle sleeve (5). The rear end of the cylindrical shaft (1) is covered
by one cover (11) with a plurality screws (12). One special nut (13) is fitted at the rear
end of the spindle sleeve (5) having clamped with a plurality of screws (14) to prevent
rotation of the special nut (13). One special bush (15) is provided between spindle
sleeve (5) and housing (7) for frictionless surface. One ring (16) is fitted with housing
(7) using a plurality screws (17) to prevent the movement of special bush (15). One
threaded spindle (18) is fitted in the special nut (13). One back cover disc (19) is fitted
with housing (7) with bolts (20) and compression springs (21) as shown in Fig.3. Also
the back cover disc (19) is fitted with one roller thrust bearing (22). One slide bush (23)
is fitted in the cover disc (19) to guide the threaded spindle (18) and for easy rotation.
Fig.4 shows one slide key (24) and one screw (25) are fitted in between housing (7)
and spindle sleeve (5) to prevent the rotation of the spindle sleeve (5) when the
threaded spindle (18) is rotated for forward and backward movement of shaft (1). All
components are made of steel materials.
WE CLAIM
1. A centre holder for axial support of turbine rotors comprises:
- a cylindrical configuration having a central cylindrical shaft (1);
- the cylindrical shaft (1) having a conical shaped at front end;
- the shaft (1) is fitted with a flange (3) by a plurality of screws (2);
- the flange (3) is guided with a special flange (4) which is clamped with a spindle
sleeve (5) with a plurality of screws (6) inside a housing (7);
- the shaft (1) is supported by a plurality of ball bearings (8) for easy rotation
disposed in between one inner bush (9) and one outer bush that are fitted inside
a spindle sleeve (5);
- the rear end of the shaft (1) is covered by one cover (11) with a plurality of
screws (12);
- one special nut (13) is fitted at the rear end of the spindle sleeve (5) having
clamped with a plurality of screws (14) to prevent rotation of the special nut
(13);
- one special bush (15) is disposed in between spindle sleeve (5) and the housing
(7) for frictionless surface and one ring (16) is fitted with the housing (5) by
screws (17) to prevent the movement of special bush (15);
- one threaded spindle (18) is fitted with a special nut (13);
- one back cover disc (19) is fitted with the housing (7) with a plurality of bolts
and compression spring (21) and one roller bearing (22) is mounted inside the
back cover;
- one slide bush (23) is fitted at the rear side of roller thrust bearing in the back
cover disc (19) to guide one threaded spindle (18) for easy rotation;
- one side key (24) and one screw are fitted in between housing (7) and spindle
sleeve (5) to prevent the rotation of the spindle sleeve (5) when the threaded
spindle rotates for forward and backward movement of shaft (1);
characterised in that axial load of rotors is counter balanced by the compression
springs fitted with cover disc and the axial movement of centre shaft is
regulated by threaded spindle.
2. The centre holder as claimed in claim 1 wherein the shaft rotates along with the
rotation of rotor.
3. The centre holder as claimed in claim 1 wherein the holder is made of steel
materials.

The present invention relates to a centre holder for axial support of turbine rotors
comprises a cylindrical configuration having a central cylindrical shaft (1) and the
cylindrical shaft (1) having a conical shaped at front end and the shaft (1) is fitted with
a flange (3) by a plurality of screws (2) and the flange (3) is guided with a special
flange (4) which is clamped with a spindle sleeve (5) with a plurality of screws (6)
inside a housing (7) and the shaft (1) is supported by a plurality of ball bearings (8) for
easy rotation disposed in between one inner bush (9) and one outer bush that are fitted
inside a spindle sleeve (5) and the rear end of the shaft (1) is covered by one cover
(11) with a plurality of screws (12) and one special nut (13) is fitted at the rear end of
the spindle sleeve (5) having clamped with a plurality of screws (14) to prevent
rotation of the special nut (13) and one special bush (15) is disposed in between
spindle sleeve (5) and the housing (7) for frictionless surface and one ring (16) is fitted
with the housing (5) by screws (17) to prevent the movement of special bush (15) and
one threaded spindle (18) is fitted with a special nut (13) and one back cover disc (19)
is fitted with the housing (7) with a plurality of bolts and compression spring (21) and
one roller bearing (22) is mounted inside the back cover and one slide bush (23) is
fitted at the rear side of roller thrust bearing in the back cover disc (19) to guide one
threaded spindle (18) for easy rotation and one side key (24) and one screw are fitted