Load-Sensing Fluid Circuit With Accumulator Pressure Compensation
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Solution Overview
Problem
In fluid circuits with load sensing systems, high load pressures require large hydraulic pumps, leading to degraded energy efficiency.
Innovation Solution
A fluid circuit with a pressure fluid source, multiple actuators, a direction switching valve, and a discharge amount control mechanism, including an accumulator to adjust the supply pressure based on accumulator pressure, ensuring the supply pressure is higher than the maximum load pressure by a target pressure difference, and using an electromagnetic proportional pressure reduction valve to control the pressure difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large hydraulic pump is used to handle high load pressures, then the system can respond to high load demands, but energy efficiency is degraded
Solution Approach 1:
The accumulator stores pressure fluid in advance during low-demand periods when the pump operates at lower pressure. When high load pressure is demanded, the accumulator releases the stored pressure fluid immediately, eliminating the need for the pump to continuously operate at high pressure capacity, thus improving energy efficiency while maintaining reliability
Solution Approach 2:
The accumulator acts as an intermediary between the pump and the actuators. It decouples the pump's pressure generation from the actuators' pressure demands, allowing the pump to operate more efficiently while the accumulator handles peak pressure demands, thereby resolving the contradiction between handling high load pressure and maintaining energy efficiency
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 configuration allows for high-energy-efficiency operation by adjusting the output pressure of the pressure fluid source according to the accumulator pressure, effectively compensating for load pressure fluctuations and improving energy efficiency.
Implementation Method 1
an accumulator (60) configured to accumulate part of return fluid from the actuators, the accumulator being able to discharge the pressure fluid from the accumulator to a pressure-fluid-source-side flow path of the direction switching valve
Implementation Method 2
using an electromagnetic proportional pressure reduction valve to control the pressure difference
Data Source
AI summary
A fluid circuit includes a pressure fluid source configured to supply pressure fluid, multiple actuators connected to the pressure fluid source, a direction switching valve configured to switch a supply destination of the pressure fluid supplied from the pressure fluid source, and a discharge amount control mechanism configured to control the output pressure of the pressure fluid source such that a pressure difference ΔP between the output pressure of the pressure fluid source and the maximum load pressure of the load pressures of the multiple actuators reaches a target value ΔPt. The fluid circuit further includes an accumulator configured to accumulate part of return fluid from the actuators.