SEMINAR ON
SUBMITTED
BY
VIKAS GUPTA
EN-VI (B)
OVERVIEW
 Introduction
 History
 Types of Hydraulic Accumulator
 Functions of Accumulator
 Accumulator design conside...
INTRODUCTION
 A Hydraulic Accumulator is energy storage device.
 It is pressure storage reservoir in which a non-
compre...
HISTORY
 First Hydraulic accumulator was made
by William Armstrong in 1846 built a
crane powered by water of town mains
a...
1. Tower type accumulator
2. Raised weight accumulator
3. Compressed-gas accumulator
4. Spring accumulator
TYPES OF HYDRAU...
1. TOWER TYPE ACCUMULATOR
 The first accumulators for
Armstrong’s hydraulic dock
machinery were simple raised water
tower...
2. RAISED WEIGHT ACCUMULATOR
 A raised weight accumulator consists
of a vertical cylinder containing fluid
to the hydraul...
ADVANTGES :
 Used to meet heavy industrial
requirements.
 Extremely high capacity at low cost.
 Rugged and durable cons...
3. COMPRESSED GAS ACCUMULATOR
 It is widely used accumulator in present scenario.
 It is popularly known as “hydro-pneum...
4. Spring type accumulator
 It uses the energy stored in springs to create a constant
force .
 The load characteristics ...
HYDARULIC SYMBOLS
FUNCTIONS : Where are accumulators used?
Accumulators can be applied creatively in any number of
situations, including:
 ...
 Energy conservation
 Improved response times: An accumulator (bladder type) has virtually
instantaneous response time t...
ACCUMULATOR DESIGN CONSIDERATION :
(What must I know to size and select an accumulator?)
Accumulator type
Accumulator vo...
APPLICATIONS
Accumulators are devices used to store fluid power to do the
following:
Agricultural Machinery & Equipment.
...
CONCLUSION
So what are the benefits of using accumulators?
 Lower installed system costs, accumulator assisted
hydraulics...
 Reduced noise levels, reduced pump and motor size
couple with system shock absorption overall machine
sound levels and r...
Hydraulic accumulator presentation by vikas
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Hydraulic accumulator presentation by vikas

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Hydraulic accumulator presentation by vikas

  1. 1. SEMINAR ON SUBMITTED BY VIKAS GUPTA EN-VI (B)
  2. 2. OVERVIEW  Introduction  History  Types of Hydraulic Accumulator  Functions of Accumulator  Accumulator design consideration  Application  Conclusion
  3. 3. INTRODUCTION  A Hydraulic Accumulator is energy storage device.  It is pressure storage reservoir in which a non- compressible hydraulic fluid is held under pressure by an external source.  The external source used can be a spring, a raised weight, or a compressed gas.  The main reasons that an accumulator is used in a hydraulic system, is that the pump doesn’t need to be so large to cope with extremes of demand and supply circuit can respond quickly to any temporary demand and to smooth pulsation.
  4. 4. HISTORY  First Hydraulic accumulator was made by William Armstrong in 1846 built a crane powered by water of town mains at Newcastle, United Kingdom.  Later 1852 ,Armstrong used Grimsby Dock Tower for the constant pressure for cranes, lock gates and sluices.  Grimsby Dock Tower is hydraulic accumulator is used for the purpose of containing a 30,000UK gallon (136 m3) hydraulic wrought iron reservoir at a height of 300feet (91 m) to provide power for lock gates and cranes of Grimsby Dock.
  5. 5. 1. Tower type accumulator 2. Raised weight accumulator 3. Compressed-gas accumulator 4. Spring accumulator TYPES OF HYDRAULIC ACCULUMATOR
  6. 6. 1. TOWER TYPE ACCUMULATOR  The first accumulators for Armstrong’s hydraulic dock machinery were simple raised water tower.  It uses hydraulic head  It delivers constant pressure to the output LONDON TOWER BRIDGE
  7. 7. 2. RAISED WEIGHT ACCUMULATOR  A raised weight accumulator consists of a vertical cylinder containing fluid to the hydraulic line.  The cylinder is closed by a piston on which a series of weights are placed that exert a downward force on the piston and thereby energizes the fluid in the cylinder.  Gravity acts on the weight to pressurize the hydraulic system fluid, thus storing energy.
  8. 8. ADVANTGES :  Used to meet heavy industrial requirements.  Extremely high capacity at low cost.  Rugged and durable construction. LIMITATIONS :  Extremely bulky and heavy.  Problem in sealing. Hydraulic engine house, Bristol Harbor.
  9. 9. 3. COMPRESSED GAS ACCUMULATOR  It is widely used accumulator in present scenario.  It is popularly known as “hydro-pneumatic accumulator”. It apply force to the liquid by using a compressed gas that acts as the spring.  It uses inert gas (nitrogen) under pressure that provides the compressive force on fluid.  Oxygen is not used because oxygen and oil can form an explosive mixture when combined under pressure  As the volume of the compressed gas changes the pressure of the gas, and pressure of the fluid, changes inversely.
  10. 10. 4. Spring type accumulator  It uses the energy stored in springs to create a constant force .  The load characteristics of a spring are such that the energy storage depends on the force required to compress s spring.  The free (uncompressed) length of a spring represents zero energy storage.  As liquid under pressure enters the cylinder, causing a spring to compress, the pressure on the liquid will rise because of the increased loading required to compress the spring.
  11. 11. HYDARULIC SYMBOLS
  12. 12. FUNCTIONS : Where are accumulators used? Accumulators can be applied creatively in any number of situations, including:  Shock or pulsation dampening: An accumulator can be used to cushion the pressure spike from sudden valve closure, the pulsation from pumps or the load reaction from sudden movement of parts connected to hydraulic cylinders.  Leakage compensation: An accumulator can be used to maintain pressure and make-up for lost fluid due to internal leakage of system components including cylinders and valves.  Thermal expansion: An accumulator can absorb the pressure differences caused by temperature variations in a closed hydraulic system.
  13. 13.  Energy conservation  Improved response times: An accumulator (bladder type) has virtually instantaneous response time that can provide fluid very quickly to fast-acting valves such as servos and proportional to improve their effectiveness Discharge valve, electric (optional) Accumulator P-port Gauge portShut-off valve Manifold Block Pressure- relief valve Discharge, manual Adapter fitting, Flange
  14. 14. ACCUMULATOR DESIGN CONSIDERATION : (What must I know to size and select an accumulator?) Accumulator type Accumulator volume Nominal hydraulic system pressure Minimum and Maximum hydraulic system pressure Pre-charge pressure Required flow rate Output volume capacity Recharge time Response time Fluid type
  15. 15. APPLICATIONS Accumulators are devices used to store fluid power to do the following: Agricultural Machinery & Equipment. Forestry Equipment. Oil Field & Offshore. Machine Tools and Off- Road Equipment. Mining Machinery & Equipment. Construction Equipment. Suspension in vehicles.
  16. 16. CONCLUSION So what are the benefits of using accumulators?  Lower installed system costs, accumulator assisted hydraulics can reduce the size of the pump and electric motor which results in a smaller amount of oil used, a smaller reservoir and reduced equipment costs.  Less leakage and maintenance costs, the ability to reduce system shocks will prolong component life, reduce leakage from pipe joints and minimize hydraulic system maintenance costs.  Improved performance, low inertia bladder accumulators can provide instantaneous response time to meet peak flow requirements. They can also help to achieve constant pressure in systems using variable displacement pumps for improved productivity and quality.
  17. 17.  Reduced noise levels, reduced pump and motor size couple with system shock absorption overall machine sound levels and results in higher operator productivity.  Flexible design approaches. A wide range of accumulator types and sizes, including accessory items, provides a versatile and easy to apply design approach.  Reduced energy costs, cost savings of up to 33% are achievable in high performance industrial machinery using accumulators.

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