Hydraulic Accumulator
Hydraulic Accumulator is an energy storage device which is filled with
pressurized fluid that supplied constant pressure to hydraulic system. Fluid is
pumped by the
hydraulic pump
and enters into the accumulator and starts charging as the nitrogen in the
bladder is compressed via fluid pressure is greater than the pre-charged
pressure. When pump can't supply constant pressure in any sudden case the
accumulator can supply instant pressure for smooth pulsation.
Generally,
accumulator is separated between compressible gas and non-compressible fluid
inside the shell. The bladder pre-charged with nitrogen gas and pressure
calculated by system requirement.
Hydraulic accumulator has three separate part according to construction:-
- Hydraulic fluid/oil chamber
- Piston
- Compressed gas/Oil chamber
Spring accumulator
In a spring type accumulator spring forces to piston and it acts against the
fluid. Spring supply the require pressure to the system if needed. Spring
accumulator is used to mobile applications for their small in size. There are
some disadvantages of spring accumulators. Its cycle rates is very high and
spring may lose their elasticity.
Raised weight accumulator
Raised weight accumulator constructed with a cylinder and fluid filled inside
it. A series of weights kept on it and exerts a downstream force to the piston
resulting pressure and thus delivery the constant pressure. This type of
accumulator has used in the tower, bridge London.
Piston accumulator
Piston accumulator is consist of cylinder assembly and fluid and gas is
separated with piston. When fluid enters inside the cylinder then piston acts
to upstream forces to gas and it get compressed and when system needs instant
pressure piston forces downstream pressure and supplied needed pressure to the
system. Usually piston accumulator uses due to their greater efficiency and
flexibility and can operate in high temperature fluids. Mounting is very easy
and long life time and require less maintenance. On the other hand, it is very
expensive to manufacture.
Bladder accumulator
Bladder accumulator is a kind of hydro-pneumatic accumulator. This type of
accumulator is filled with nitrogen gas and fit inside the steel pressure
vessel. Typically, bladder accumulator is use to both low- and high-pressure
applications. This type of accumulator can response time is fast.
Compressed gas accumulator
This type of accumulator have a cylinder inside and an elastic diaphragm
separate this two chamber between fluid and gas. Fluid chamber is connected
with hydraulic line and other chamber hold gas under pressure.
Diaphragm accumulator
Diaphragm accumulator is used in both industrial and mobile applications. A
synthetic rubber diaphragm that separate with the gas and liquid chambers. Its
main advantages are Compaq design, low cost and quick shock response type.
Applications of accumulator
Mobile hydraulics and industrial machinery.
Advantages of accumulator
- Relatively low installation cost
- Reduce hydraulic system shocks
-
Quick response to hydraulic system for constant flow (As an example piston
pumps create pulsating flow)
- Reduce the noise levels and shock absorption
- Maintain constant pressure
Basic hydraulic system components. Basic pneumatic system. Basic hydraulic
components pneumatic system
hydraulic accumulator Our facebook group
Post a Comment