BEARINGS FOR THERMAL POWER PLANT
SHIVAJI CHOUDHURY
TYPE OF BEARINGS
Plain Bearing
Plain bearing is simplest type of bearing ,comprising just a bearing surface and no rolling elements
also known as specific styles bushing, journal bearings, sleeve bearing, rifle bearing.
These bearings are mostly suited for high speed and high load
Rolling element bearings : A rolling-element bearing,
also known as a rolling bearing,is a bearing which carries a load by placing round elements between the two pieces. The relative motion of the pieces causes the round elements to roll with very little rolling resistance and with little sliding.
ROLLING ELEMENT BEARING
BALL BEARING ROLLER BEARING
RADIALRADIAL THRUSTTHRUST
Deep groveBall bearing
Angular contactBall bearing
Self alignmentBall bearing
ThrustBall bearing
Angular contactThrust Ball bearing
Cylindrical Roller bearing
Taper Roller bearing
Needle Roller bearing
Cylindrical thrustRoller bearing
Needle thrustRoller bearing
Taper thrustRoller bearing
Spherical thrust Roller bearing
SphericalRoller bearing
TYPES OF ROLLING BEARING Ball bearing
Roller bearing
Ball bearings are generally better suited for higher speeds and lighter load ,while roller bearings are used for relatively slower speed and heavier load.
Cylindrical roller bearings utilize cylinders with approx length/ratios ranging from 1.1 to 1.3
Needle bearings have rollers whose lengths are at least 4 times their diameter.
BALL BEARINGSo DEEP GROOVE BALL
BEARINGS o The most popular types
among rolling bearing.o Radial load and axial load in
both directions can be accommodated.
o Suitable for operation at high speed with low noise and low vibration.
ANGULAR CONTACT BALL BEARINGS
Angular contact bearing are common in applications involving heavy thrust load.
single row angular bearings are good for thrust in one direction where double row angular bearings can carry thrust in either direction.
BALL BEARINGo SELF ALIGMENT BALL
BEARING o There are two sets of balls which run on a
pair of grooves on the inner ring, with a single outer-ring concave surface.
This allows the bearing to accommodate misalignment of the shaft.
The self-aligning radial contact bearings are a popular choice in applications involving heavy load ,high speed and long bearing span but they can not withstand high thrust load.
BALL THRUST BEARING composed of ball bearing
supported in a ring, can be used in low thrust applications where there is little radial load.
CYLINDRICAL ROLLER BEARING CYLINDRICAL ROLLER
THRUST BEARING These bearings are suitable for
arrangements that have to support heavy axial loads.
Can only accommodate axial loads acting in one direction.
Use of this type of bearing is limited to low rotation speed.
CYLINDRICAL ROLLER BEARING
Roller bearings typically have higher load capacity than ball bearings, but a lower capacity and higher friction under loads perpendicular to the primary supported direction.
NEEDLE ROLLER BEARING NEEDLE ROLLER THRUST
BEARING These bearing can
accommodate heavy loads and shock load.
these bearings provide a high degree of stiffness with in minimum space
NEEDLE ROLLER BEARING
These bearings are roller bearing with cylindrical roller bearing are small in diameter ,in spite of their low cross section
Needle roller bearing have a high load carrying capacity and extremely suitable for bearing arrangements where radial space is limited .
TAPER ROLLER BEARING TAPER ROLLER
THRUST BEARING Tapered thrust bearings include
rollers that have conical sections.
The bearing design ensures a true rolling motion for maximum bearing life and load-carrying capacity.
TAPER ROLLER BEARING Taper are generally used in
applications involving heavy radial and thrust load.
The bearing is elements in rolling surface and raceways intersect at common point on axis.
Taper roller bearing are generally mounted in pair ,one facing the other
SPHERICAL ROLLER BEARING SPHERICAL ROLLER
THRUST BEARING Spherical roller thrust bearings
are ideal for applications where conditions include heavy loads, difficulties in establishing or maintaining housing alignment and problems with shaft deflection.
SPHERICAL ROLLER BEARING
Spherical roller bearings are inherently self-aligning and very robust. The two rows of rollers make the bearings able to carry heavy loads.
These bearings are designed for heavy radial loads and moderate thrust .
APPLICATION OF BEARINGSS.N TYPE OF BEARING TYPICAL APPLICATION
1 RADIAL BALL BEARING
ONE ROW OF BALLS
ELECTRICAL MOTORS,CART AND LIGHT TRAILER WHEELS,CONVEYER BELTS PULLEY,GEAR BOX
2 RADIAL BALL BEARING
TWO ROWS OF BALLS
REDUCTION GEAR BOX
3 ANGULAR CONTACT BALL BEARING
ONE ROW OF BALLS
CENTRIFUGAL PUMPS,MACHINE TOOLS,ENDLESS SCREW GEARBOX.
4 ANGULAR CONTACT BALL BEARING
TWO ROWS OF BALLS
ENDLESS SCREW REDUCTION GEARBOX,CART WHEEL
5 SELF ALIGNMENT BALL BEARING
LONG AND FLEXIBLE SHAFT ,LIGHT SHELL
APPLICATION OF BEARINGSS.N TYPE OF BEARING TYPICAL APPLICATION
6 CYLINDERICAL ROLLER BEARING
LARGE ELECTRICAL MOTORS
7 TAPPERED ROLLER REDUCTION GEAR SHAFT,TRUCK WHEEL
8 SPHERICAL ROLLER BEARING
LARGE INDUSTRIAL FANS,LARGE REDUCTION GEAR BOX
9 BALL THRUST BEARING VERTICAL SHAFT THRUST BEARING
10 SPHERICAL ROLLER THRUST BEARING
HEAVY VERTICAL SHAFT (FANS,TURBINE,GENERATOR)
JOURNAL BEARINGS Journal bearings are commonly used in turbine, large fans,
large pumps that operate at high speed and temperature. These types of bearings utilize hydrodynamics
lubrication ,which means that load carrying surfaces of bearing are separated by relatively thick film of lubrication that prevents metal to metal contact.
Journal bearings are coated with layer of white metal or Babbitt material ,serves as bearing surface.
TYPE OF JOURNAL BEARINGS
Cylindrical bearing.
Cylindrical bearing with grooves.
Elliptical lobe bearing.
Tilting pad bearing.
CYLINDRICAL JOURNAL BEARING
Cylindrical journal bearings are most common type of type of journal bearing used in industry.
It consists of cylindrical steel blocking plate with Babbitt bonded to inside bearing surface and the bearings are generally split into two halves for ease of assembly.
JOURNAL BEARINGS JOURNAL BEARING THRUST BEARING
Thrust bearings keep the rotor in its correct axial position
TURBINE BEARINGS500 MW KWU TURBINE
JOURNAL BEARING
THRUST CUMJOURNALBEARING
JOURNALBEARING
JOURNALBEARING
JOURNAL BEARING (210 MW KWU L P TURBINE)
BEARINGS FOR FANS
Most power plant fans utilize oil film journal bearings
Roller bearings are most commonly used in smaller to medium size fans.
BEARINGS FOR ID FAN
BEARINGS FOR FD FAN
BEARING FOR BFP Journal bearing. Thrust bearing.
JOURNALBEARING
THRUST BEARING
BEARINGS FOR CEP Vertical pumps
used for condensate service typically equipped with sleeve bearings.
Sleeve bearing for condensate pumps are typically design for lubrication by pumped fluid.
BEARINGS FOR AIR PRE HEATER
BEARINGS FOR BOWL MILL :XRP I .Taper roller journal bearing Journal Bearing (Upper & Lower) in sets H 242649 / H 242610 / 437549 / HH 437510 . II. Vertical shaft bearing a) Thrust bearing C-8091-C or T11000 or 577101 / T-811 / KT 811 b) Upper bearing 5256E / N1050 or 577089 / 326097 / HB-1-BC-1B
SKF Germany (or) Timken TTL USA (or) 577089A-NR-513-FAG Germany /280 RU
92. c) Lower bearing NU330 / A5240 WMR6 / 5240 SKF / 548408 FAG
III .Worm shaft bearing a) Thrust bearing 454761, 541358A / 29438 / 29438-CD-FAG
Germany or FAG 41358A b) Radial bearing N334 FAG Germany (or) N334 EMI .
BEARINGS FOR AIR PRE HEATER :500 MW
SN SERVICE BEARING TYPE
BEARINGNO
1 PAPH SUPPORT BRG SPH ROLLER THRUST BRG
294/560E
2 PAPH GUIDE BRG SPH ROLLER BRG 23060/CCK/C3/W33
3 SAPH SUPPORT BRG SPH ROLLER THRUST BEARING
23072/CCK/C3/W3
4 SAPH GUIDE BRG SPH ROLLER BRG 23072/CCK/C3/W33
BEARING STANDARDS AFBMA/ANSI (Anti friction bearing manufacturers
association/ American national standard institute) STD -20 (RADIAL BEARING,EXECPT TAPERED ROLLER
BEARINGS) STD-19.1(EXCEPT TAPPERED ROLLER BEARINGS) ISO ISO-492 (RADIAL BRG) ISO -199 (THRUST BALL BEARINGS) JIS JIS-B 1524 (ALL TYPES OF BEARINGS) DIN DIN-620 (ALL TYPES OF BEARINGS)
THANKING YOU
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