Hydropneumatic Accumulator Segmentation for Leakage and Damping Trade-off
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Solution Overview
Problem
Hydropneumatic pressure accumulators face a trade-off between service life and damping efficiency, as small gas volumes lead to high pressure loss due to gas leakage, while larger volumes result in inefficient damping, especially with high-frequency pressure pulses.
Innovation Solution
A hydropneumatic pressure accumulator design featuring a fixed dividing wall with a check valve connecting the gas storage and working spaces, dynamically decoupling the chambers to prevent gas transfer during pressure increases and allowing after-flow during decreases, allowing for a large additional gas volume without the inefficiencies of small gas working volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the volume of the gas working chamber is increased to counteract gas losses and extend service life, then service life is improved, but damping efficiency deteriorates because the system becomes too soft with higher workspace volumes
Solution Approach 1:
The gas volume is segmented into two distinct chambers: a gas working chamber (24) with small volume for efficient damping, and a gas storage chamber (12) with large volume for compensating gas losses. The partition wall (28) with connecting passage (30) separates these functions while allowing controlled interaction through a check valve (32), resolving the contradiction between service life and damping efficiency.
Solution Approach 2:
A check valve (32) is introduced as an intermediary component in the connecting passage (30) between the gas storage chamber (12) and gas working chamber (24). This valve acts as a one-way gate that allows gas to flow from the storage chamber to the working chamber when pressure drops, but prevents reverse flow during pressure increases, enabling the system to maintain both large total gas volume and small working chamber volume.
2Reliability
If the volume of the gas working chamber is decreased to improve damping efficiency, then damping efficiency is improved, but service life is reduced due to unreasonably high pressure loss from gas leakage
Solution Approach 1:
The gas volume is segmented into two distinct chambers: a gas working chamber (24) with small volume for efficient damping, and a gas storage chamber (12) with large volume for compensating gas losses. The partition wall (28) with connecting passage (30) separates these functions while allowing controlled interaction through a check valve (32), resolving the contradiction between service life and damping efficiency.
Solution Approach 2:
The check valve (32) enables the system to recover gas from the storage chamber (12) when pressure in the working chamber (24) drops due to leakage or pulsations. This recovery mechanism discards the problem of gas loss by providing a reservoir that automatically replenishes the working chamber, thereby extending service life without compromising damping performance.
3Duration of action of stationary object
If a large additional gas volume is provided in the accumulator housing, then service life is extended, but the interior space must be reduced by partition arrangement to maintain small gas working space
Solution Approach 1:
The partition wall (28) is arranged transversely to the longitudinal axis (4) of the accumulator housing (2), dividing the interior space into axial segments. This dimensional arrangement allows the gas storage chamber (12) to occupy the end region while the gas working chamber (24) occupies the central region, efficiently utilizing the housing volume and simplifying the overall structure compared to alternative spatial arrangements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design extends the service life and maintains high damping efficiency by decoupling the gas chambers, providing a static behavior similar to a large-volume system while maintaining a small gas working volume, effectively addressing the leakage issues and efficiency concerns.
Implementation Method 1
the connecting section between the gas storage space and the gas working space contains a check valve which opens when the pressure in the gas storage space exceeds the pressure in the gas working space. This prevents any transfer of gas from the gas working chamber to the gas storage chamber in the event of a pressure increase caused by pulsations
Implementation Method 2
a gas working chamber (24) which is adjoined by a fluid chamber (22) and in which a pressurized working gas is present, wherein the pressurized working gas serves to damp pressure pulsations in the fluid chamber (22)
Data Source
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AI summary
The invention relates to a hydropneumatic pressure accumulator, in particular a pulsation damper, comprising an accumulator housing (2) and a movable separating element (20), which separates a pressurized working gas-containing gas working space (24) from a fluid chamber (22) in the accumulator housing (2). The hydropneumatic pressure accumulator is characterized in that a gas storage chamber (12) is provided, which contains an additional volume of the pressurized working gas, said gas storage chamber (24) being connected via a connecting path (30) having a throttle point.