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 Hydraulic Accumulator

  • The hydraulic accumulator is an energy storage device in which one end is closed and another is connected to the hydraulic pipes.
  • The hydraulic accumulator is divided into three parts: compressed gas (air chamber), piston, and hydraulic fluid (oil chamber).
  • Hydraulic fluid, pressurized by a hydraulic pump, forces the piston of the accumulator to compress the gas in the air chamber.
  •  The compressed gas can store the energy just like a spring. When the aircraft needs the extra flow, the
  • compression energy will release to compensate for the system needs.
  • The the main function of the hydraulic accumulator includes the following:
  • l Provide transient flow in a short time:
  •  The hydraulic accumulator can provide the peak flow in a short time in an intermittent work hydraulic system
  • such as the landing gear control and flap control. The hydraulic accumulator can decrease the size and reduce the weight of the hydraulic system.
  • l Compensate for the leakage and maintain the pressure: The accumulator can provide the flow and maintain constant pressure for the actuation unit that does not move for a long time but needs to maintain constant pressure.
  • l Work as an emergency power supply: When the hydraulic power supply system suddenly stops feeding the hydraulic fluid, the hydraulic accumulator can provide the fluid to keep the system operational in case of
  • emergency. 

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