

Add to Cart
Working principle of energy accumulator
Hydraulic oil is an incompressible liquid, so it is not possible to
accumulate pressure energy using hydraulic oil, and it needs to
rely on other media to convert and accumulate pressure energy. For
example, the bladder type inflatable accumulator developed by using
the compressibility of gas (nitrogen) is a device for storing
hydraulic oil. The bladder type accumulator consists of an oil part
and a gas part with a gas seal, and the oil around the bladder is
connected to the oil circuit. When the pressure increases, the oil
enters the accumulator and the gas is compressed until the system
pipeline pressure no longer increases; When the pipeline pressure
drops, compressed air expands, hydraulically injecting oil into the
circuit, thereby slowing down the decrease in pipeline pressure.
The purpose of the accumulator
Accumulators have two purposes. ① When the flow required by the
load during low-speed movement is less than the flow rate of the
hydraulic pump, the excess flow rate of the hydraulic pump is
stored in the accumulator. When the flow rate required by the load
is greater than the flow rate of the hydraulic pump, the liquid is
discharged from the accumulator to compensate for the insufficient
flow rate of the hydraulic pump When the machine is shut down but
still needs to maintain a certain pressure, the hydraulic pump can
be stopped and the accumulator can compensate for the leakage of
the system to maintain the pressure of the system. Accumulators can
also be used to absorb the pressure pulsation of hydraulic pumps or
the hydraulic impact pressure generated in the system. The pressure
in an accumulator can be generated by compressed gas, heavy hammer,
or spring, and the accumulator can be divided into gas type, heavy
hammer type, and spring type accordingly. The direct contact
between gas and liquid in gas accumulators is called contact type,
which has a simple structure and large capacity, but gas is easily
mixed in the liquid, and is commonly used in hydraulic presses. Gas
and liquid that do not come into contact with each other is called
an isolation type, which is commonly isolated by a skin bag and a
diaphragm. The volume change of the skin bag is large, while the
volume change of the diaphragm is small, and it is commonly used to
absorb pressure pulsations. The heavy hammer type has a large
capacity and is commonly used in systems such as rolling mills for
energy storage.