FIELD OF INVENTION
[001] The present disclosure relates to hydroelectric generators / motors, more particularly, the present disclosure relates to a radial jack for transmitting forces and vibrations from the hydroelectric generators / motors.
BACKGROUND OF THE INVENTION
[002] Hydroelectric generators are commonly used to generate and supply electricity into an electrical grid. The generators of this kind generally include turbines comprising a rotor with a rotor hub and a plurality of blades. The rotor is set into rotation under the influence of flowing water on the blades. The rotation of the rotor shaft drives the generator rotor.
[003] During operation of the hydroelectric generator, undesired vibrations may
occur in the system structure under operations. Vibrations in this sense are meant
to include any kind of oscillatory or repeating displacements in any direction
(transverse, longitudinal or torsional) of any amplitude (large or small) and of any
frequency (high or low, constant or varying). These vibrations may be caused by
different factors, e.g. flowing water striking the blades,
rotor movements, structure imbalances, vibrations from the foundation structure etc. If generator is subjected to this kind of vibrations during a prolonged period of time, fatigue damage may result. Fatigue damage may lead to a reduced life time of the generator and/or its components. Furthermore, the danger exists that when vibrations cause resonance in the generator, this can lead to a potentially dangerous increase of the vibrations.
[004] In order to overcome the damage due to vibrations, radial jacks are provided to counter external forces acting on the generator while in operation. These jacks are mostly used in suspended/top bracket type of generator construction. Various factors are involved in the designing of radial jacks for vertical hydro generators/motors. For example, the forces acting on the radial jack forms the basic measures involved in the construction of radial jack for hydro

generators/motors. Radial jacks are required for: transmission of radial forces and UMP acting on bearing bracket to concrete; to enhance the radial stiffness of the bearing bracket; to reduce the undue vibrations occurring in the generator; etc.
OBJECTS OF THE INVENTION
[005] An object of the invention is to propose novel design of radial jack for transmission of radial forces & unbalanced magnetic pull acting on bearing bracket of hydro generator.
[006] Another object of the invention is to enhance the radial stiffness of the bearing bracket and reduce the vibrations occurring in generator with effective utilization of material for cost saving.
[007] Further object of the invention is to make the arrangement robust to handle forces acting on it and ease of assembly during erection & maintenance.
SUMMARY OF THE INVENTION
[008] The present disclosure relates to a radial jack for a hydroelectric power generator / motor. The radial jack includes a bracket plate (1) coupled to a bracket assembly of the hydroelectric power generator; a square plate (2) configured to be coupled to the bracket plate (2); a cylinder (3) having one end secured to the square plate (2), wherein the cylinder (3) includes a plurality of ribs (4) being equi-angularly disposed on circumference / outer surface of the cylinder (3), the ribs (4) being extending along a length of the cylinder (3); a block (5) being coupled to a second end of the cylinder (3), the block (5) includes a bush (6) to receive a lock nut (7) and a thrust bolt (8), the thrust bolt (8) being configured to be screwed to the lock nut (7), wherein the thrust bolt (8) includes a spherical surface head; and a foundation plate (9) contacting the spherical surface head of the thrust bolt (8), the foundation plate (9) being embedded in a generator foundation, wherein forces generated in the hydroelectric power generator are transmitted from the bracket plate (1) to the foundation plate (9).

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[009] Further objects and advantages of this invention will be more apparent from
the ensuing description when read in conjunction with the accompanying drawings
of the exemplary embodiments and wherein:
Figure 1 shows: Novel arrangement of radial jack.
Figure 2 shows: Cross-sectional view of arrangement of radial jack of Fig. 1 in accordance with an embodiment of the present disclosure.
Figure 3 shows: Cross-section of radial jack structure.
Figure 4 shows: Detail of foundation plate.
DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE
PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING
DRAWINGS
[0010] The present invention, now be described more specifically with reference to
the following specification.
[0011] Fig. 1 illustrates a novel arrangement of radial jack in accordance with an embodiment of the present disclosure. As shown, the radial jack is provided between a top bracket assembly of the hydroelectric power generator and a generator foundation. In an embodiment, the radial jack is configured to effectively transmit radial, vibration, and other unbalanced forces of the hydroelectric power generator to the generator foundation.
[0012] Fig. 2 illustrates a cross-sectional view of arrangement of the radial jack with respect to the hydroelectric power generator and the generator foundation. As shown, the radial jack includes a bracket plate (1) coupled to a bracket assembly of the hydroelectric power generator. The radial jack further includes a square plate

(2) configured to be coupled to the bracket plate (1). In an embodiment, the radial jack assembly consists of the square plate (2) at the base by which it is fixed to top bracket plate (1). The square plate (2) includes a through hole, as illustrated with ref. to Fig. 3.
[0013] The radial jack further includes a cylinder (3) having one end secured to the square plate (2). In an embodiment, the cylinder (3) includes a plurality of ribs (4) being equi-angularly disposed on circumference / outer surface of the cylinder (3), the ribs (4) being extending along a length of the cylinder (3). The ribs (4) are cuboidal shaped plates defining a length, a width, and a height. In an example, four ribs (4) are provided around the cylinder (3) at an equal interval of 90 degree.
[0014] The radial jack further includes a block (5) being coupled to a second end of the cylinder (3). In an embodiment, the block (5) includes a bush (6) to receive a lock nut (7) and a thrust bolt (8). The thrust bolt (8) being configured to be screwed to the lock nut (7), wherein the thrust bolt (8) includes a spherical surface head. In an alternate embodiment, the thrust bolt (8) may include any arcuate surface head.
[0015] Fig. 2 further illustrates a foundation plate (9). In an embodiment, the foundation plate (9) contacts or touches the spherical surface head of the thrust bolt (8). The foundation plate (9) is embedded in the generator foundation, wherein forces generated in the hydroelectric power generator are transmitted from the bracket plate (1) to the foundation plate (9). In an embodiment, the foundation plate (9) is grouted in concrete in the generator foundation, and the forces from the bracket plate (1) are transmitted to the foundation plate (9) through the spherical surface head of the thrust bolt (8).
[0016] Fig. 3 illustrates a cross-sectional view, taken along section Y-Y of Fig. 2, of the radial jack structure according to an embodiment of the present disclosure. As shown, the cylinder (3) and the ribs (4) are secured to the square plate (2). In an embodiment, the cylinder (3) and the ribs (4) are welded to the square plate (2). Fig.

3 further shows that the square plate (2) includes a plurality of threaded holes corresponding to threaded holes of the bracket plate (1). In an embodiment, the square plate (2) is secured to the bracket plate (1), as mentioned earlier, through a plurality of screws (10) and washers (11), the screws (10) and washers (11) are configured to engage the square plate (2) and the bracket plate (1) about their respective threaded holes. In an example, the square plate (2) and the bracket plate (1) includes four threaded holes. Alternatively, the square plate (2) and the bracket plate (1) may include any number of corresponding threaded holes for mutual engagement by the screws (10) and the washers (11).
[0017] Fig. 4 illustrates details of the foundation plate (9) in accordance with an embodiment of the present disclosure. As shown, the foundation plate (9) includes a plurality of grouting lugs configured to be grouted in the generator foundation. In an example, the foundation plate (9) includes four grouting lugs.
[0018] Hence optimized, cost effective and stout design of the radial jacks has been developed for utilization in various projects. This radial jack can be retro-fitted into old machines without any drastic modification in the existing structure. The complete radial jack structure is so fabricated for providing adequate stiffness to it. The number of radial jacks shall be decided on the basis of multiples of top bracket arms. The advantages of the proposed design of radial jack for hydro generator/motors are as follows:
- The designed radial jack structure is rigid enough for transmission of forces to foundation and reduces vibration in the supported structure.
- It provides sufficient flexibility between connected structures.
- Easier to install and dismantle during erection and maintenance because of simple construction.
- The optimized design of radial jack is economical.
[0019] It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments

employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims.

WE CLAIM:
1. A radial jack for a hydroelectric power generator / motor, the radial jack
comprising:
a bracket plate (1) coupled to a bracket assembly of the hydroelectric power generator;
a square plate (2) configured to be coupled to the bracket plate (1);
a cylinder (3) having one end secured to the square plate (2), wherein the cylinder (3) includes a plurality of ribs (4) being equi-angularly disposed on circumference / outer surface of the cylinder (3), the ribs (4) being extending along a length of the cylinder (3);
a block (5) being coupled to a second end of the cylinder (3), the block (5) includes a bush (6) to receive a lock nut (7) and a thrust bolt (8), the thrust bolt (8) being configured to be screwed to the lock nut (7), wherein the thrust bolt (8) includes a spherical surface head; and
a foundation plate (9) contacting the spherical surface head of the thrust bolt (8), the foundation plate (9) being embedded in a generator foundation, wherein forces generated in the hydroelectric power generator are transmitted from the bracket plate (1) to the foundation plate (9).
2. The radial jack as claimed in claim 1, wherein the cylinder (3) and the ribs (4) are welded to the square plate (2).
3. The radial jack as claimed in claim 1, wherein the foundation plate (9) is grouted in concrete in the generator foundation.
4. The radial jack as claimed in claim 1, wherein the forces from the bracket plate (1) are transmitted to the foundation plate (9) through the spherical surface head of the thrust bolt (8).

5. The radial jack as claimed in claim 1, wherein the square plate (2) includes a through hole.
6. The radial jack as claimed in claim 1, wherein the square plate (2) includes a plurality of threaded holes corresponding to threaded holes of the bracket plate (1), wherein the square plate (2) is secured to the bracket plate (1) through a plurality of screws (10) and washers (11) about their respective threaded holes.
7. The radial jack as claimed in claim 3, wherein the foundation plate (9)
includes a plurality of grouting lugs configured to be grouted in the
generator foundation.