FIELD OF INVENTION:
The invention relates to fans and particularly relates to functional testing of axial fan shaft with bearing assembly. The invention in particular relates to an apparatus for arresting vibration in an axial fan shaft with bearing functional testing.
BACKGROUND OF INVENTION:
In coal based Thermal power plants, mechanical power is produced by combustion of coal. The Boiler system burns the coal, and the thermal energy generated is used for generating steam from water. The mechanical energy of steam is converted to the rotational energy of the turbine which in turn rotates the generator which generates electricity.
Fan is one type of Turbo Machineries used for Energy Transfer. In Thermal Power Plant, it is defined as a Rotating Machine with a Bladed Impeller, which maintains a continuous Flow of Fluid (Air/Gas). It is classified as Primary Air (PA) Fan, Forced Draught (FD) Fan and Induced Draught (ID) Fan based on its application in Power Plant. Axial Profiled (AP) Fan construction has Static and Rotor Components. AP Fan Static components consists of Suction Chamber Assembly (1), Housing Assembly (2) and Diffuser Assembly (3). AP Rotor (4) components consist of Impeller (5), Shaft with Bearing assembly (6)-Typical Fan runs at 2000 RPM. The weight of the impeller (5) ranges from 1.2 tons to maximum 3.5 tons. The Fan Shaft with bearing assembly (6) has to handle the Radial and axial load to the tune of 2.5 tons.
To Ensure Temperature control and Leak tightness, All the shaft with bearing assemblies (6) are Functional tested simulating the Site working conditions.
Utility Fans in Thermal Power Plant is used for the flow of fluids, i.e. Air and Flue gas, in its respective line. Based on the flow direction with respect to its fan axis, Fans can be either Radial or Axial type. Moreover, based on its application in Power Plant, it is further classified as Primary Air (PA) Fan, Forced Draught (FD) Fan and Induced Draught (ID) Fan. The construction of Axial Fan constitutes Static and Rotor components. Impeller and shaft with bearing assembly are the Rotor components. The Drive motor is connected

with Main shaft with bearing assembly which in turn rotates the Impeller (Rotor) to create air fluid pressure. Hence Shaft with bearing assembly becomes critical in running of the Axial Fan. Being an assembly with more than 100 components, it is necessary to test the shaft with bearing assembly for its Leak tightness and free and smooth running of shaft before sending it to site.
After the completion of Shaft with bearing assembly it is taken to Test rig for functional test. Where in the shaft with bearing assembly is run at site rpm with simulated radial and axial loads. During Functional testing critical parameters like Oil Leakage, Bearing temperature and Outlet Lubricant oil temperature are inspected for meeting the design requirements. The shaft with bearing is allowed to run continuously for 8 hours during functional testing.
During Axial Fan Shaft with Bearing Assembly (6) functional testing, heavy vibrations were noticed. As a result, Radial shaft seals, angular contact ball bearings and roller bearings which are costlier component was regularly getting damaged during functional testing. This continuous rework resulted in customer dissatisfaction.
One or more drawbacks of conventional systems and process for a method for improving yield strength of a work piece 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:
An object of the present invention is to eliminate rework in shaft with bearing assembly
testing.
Another object of the invention is to reduce the cycle time of shaft with bearing assembly
testing.
Yet another object of the invention is to reduce the power consumption during shaft with
bearing assembly testing.
Further object of the invention is to reduce number man power used for shaft with bearing
assembly testing.
Still further object of the invention is to reduce the human fatigue.
SUMMARY OF THE INVENTION
The present invention provides a novel method and reduces the cycle time of the functional testing of shaft with bearing assembly used in axial fans required for thermal power plant. The vibration arresting equipment (12) has been introduced to lock the mounting flange (10) and steady rest (9).
According to this invention, there is provided an equipment for holding and arresting the mounting flange (10); and steady rest (9); where in the steady rest (9) connect the universal (11) and shaft with bearing assembly (6);
M20 eye bolt with right hand(rh) thread (18) is locked in mounting flange (10), whereas u clamp with m20 stud with left hand(lh) thread (16) and U clamp (13), m10 bolt(14), m10 nut(15) is locking the steady rest(9). Turn buckle (17) is used to adjustment. 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.
BRIEF DESCRIPTIONS 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
Fig 1. Shows axial profile fan components detail in accordance with the invention.
Fig 2. Shows axial profile rotor assembly detail in accordance with the invention.
Fig 3. Shows shaft with bearing assembly functional testing setup- sketch in accordance
with the invention.
Fig 4. Shows shaft with bearing assembly functional testing setup with vibration arresting
equipment in accordance with the invention.
Fig 5. Shows vibration arresting equipment detail in accordance with the invention.
Fig 6. Shows shaft with bearing assembly (12) drawing in accordance with 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.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION:
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.
In a conventional axial fan, Load cell adopter (7) is rested on the steady rest (9). While
applying designed Radial load using Hydraulic Piston (8), the steady rest (9) begins to
shack going out of perpendicularity. When the steady rest (9) goes out of
perpendicularity, the concentricity between Shaft (21) and Universal (11) is disturbed
resulting in vibration.
It takes more cycle time to achieve the concentricity and perpendicularity, since the
adjustments were done in trial and error method. By lifting the steady rest (9) using crane
and by providing shims the vibrations resulting due to no concentricity resulted in damage
to shaft seals (19) and Bearings (20). In turn resulting in rework of the shaft with bearing
assembly.
During rework, the entire Shaft with Bearing assembly (6) is dismantled to change the
Bearing and Shaft seals. Dismantling is a difficult and costly task, since the bearings are
assembled in interference fit by using induction heating.
Therefore, to reduce the Vibration, a novel arresting equipment was developed.
Figure 1 shows an axial profile fan components such as Suction chamber (1), Rotor housing (2), Diffuser assembly (3) and Rotor assembly assembled in accordance with the invention. As depicted,
Figure 2 shows rotor assembly with Impeller assembly (5) and Bearing assembly (6).
Figure 3 shows a shaft with bearing assembly functional testing set up depicting a steady rest (9) on which the bearing assembly (6) is mounted.

Figure 4 shows the shaft with bearing assembly functional testing set up with the vibration arresting equipment (12).
Figure 5 shows the vibration arresting equipment (12). Holding and arresting the Mounting flange (10); and Steady rest (9) is done using the Vibration arresting equipment (12). Initially M20 Eye bolt with RH thread (18) is locked in Mounting Flange (10), whereas U clamp with M20 Stud with LH thread (16) and U clamp (13), M10 Bolt (14), M10 Nut (15) is Locking the Steady rest (9). Then shaft (21) is allowed to run in slow RPM (around 100RPM). Using the Turn buckle (17) system steady rest perpendicularity is adjusted accurately to reduce the vibration.
The distance between the Mounting flange (10) and steady rest (9) is tuned to eliminate vibration. Adjustments can be done even at time of operation. Since threaded turn buckle system is used, minute adjustment can also be achieved. Once the system is stable without any vibration, the Shaft (21) RPM is increased to the design RPM (around 1500RPM).
Figure 6 shows the complete bearing assembly.
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 1o 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 recitations,” 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 does 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:

1. Elimination of rework in shaft with bearing functional testing.
2. Reduction of cycle time for bearing functional testing.
3. Reduction of man power.

List of reference numerals:
1. Suction Chamber
2. Rotor Housing
3. Diffuser Assembly 54. Rotor Assembly
5. Impeller
6. Bearing assembly
7. Load cell adopter
8. Load cell 109. Steady rest

10. Mounting flange
11. Universal
12. Vibration arresting equipment
13. U clamp 1514. M10 bolt

15. M10 nut
16. LH thread
17. Turn buckle
18. RH thread 2019. Shaft seals

20. Bearing
21. Shaft

We claim:
1. An apparatus for arresting vibration for a shaft (21) with bearing assembly in an axial fan
profile, comprising
5- M20 eye bolt with RH thread (18) locked in a mounting flange (10);
- a U-clamp (13) consisting of a M20 stud with LH thread (16), M10 bolt (14) and M10 nut (15) to lock the steady rest (9);
- turn buckle (17);
wherein the turn buckle (17) is rotated to vary the distance between the mounting flange
10 (10) and steady rest (9) which arrests the vibration.
2. The apparatus as claimed in claim 1, as illustrated in the accompanying drawings.