Fluid Pressure Cylinder Return Circuit Using Chamber-to-Chamber Air Reuse
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Solution Overview
Problem
Conventional double acting fluid pressure cylinder driving devices require a larger output for the driving process and lack efficient energy recovery during the return process, leading to prolonged return times and complex circuit structures.
Innovation Solution
A driving method and device for a double acting fluid pressure cylinder that includes a switch valve, fluid supply source, discharge port, and supply check valve, allowing fluid to be supplied from one cylinder chamber to another and discharged externally, thereby rapidly increasing the pressure of one chamber and decreasing the other, simplifying the circuit and reducing return time, with optional throttle valves and tanks for energy savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a complex recovery valve is used to accumulate exhaust air in an accumulator, then energy recovery is improved, but device complexity increases and return time is prolonged
Solution Approach 1:
The invention extracts the essential function of energy recovery from the complex recovery valve system and implements it through a simplified circuit using only a check valve. The check valve selectively directs exhaust air either to the accumulator for energy recovery or directly to the atmosphere, eliminating the need for complex pressure-sensing and switching mechanisms while maintaining effective energy recovery.
Solution Approach 2:
The system enables self-service energy recovery where the exhaust air from the drive side pressure chamber automatically accumulates in the accumulator through the check valve when pressure conditions are favorable, without requiring external control or complex monitoring systems. The high-pressure exhaust air self-directs to the accumulator, and the accumulated pressure automatically serves the return process.
2Loss of energy
If exhaust air is accumulated in an accumulator through a recovery valve, then energy recovery is improved, but return time increases due to delayed discharge
Solution Approach 1:
The invention introduces dynamic switching capability through the check valve that responds to pressure conditions. The system can dynamically adjust between two modes: accumulating exhaust air in the accumulator when energy recovery is beneficial, and directly discharging to the atmosphere when rapid return is needed. This dynamic adaptability resolves the contradiction between energy recovery and return time.
3Loss of energy
If a complex recovery valve with multiple connection states is used, then energy recovery control is improved, but ease of operation deteriorates
Solution Approach 1:
The simplified circuit with the check valve operates autonomously based on pressure differential, eliminating the need for complex control mechanisms. The check valve automatically directs flow based on pressure conditions, making the system easier to operate while maintaining effective energy recovery control.
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 approach shortens the return time of the fluid pressure cylinder, simplifies the circuit, and conserves energy by reusing discharge pressure without the need for complex recovery valves, while allowing for adjustable fluid ratios and pressure management.
Implementation Method 1
When the switch valve is at a second position, the one cylinder chamber communicates with the other cylinder chamber via the supply check valve
Implementation Method 2
supplying part of the fluid accumulated in the one cylinder chamber toward the other cylinder chamber... the fluid pressure of the other cylinder chamber increases and the fluid pressure of the one cylinder chamber rapidly decreases
Data Source
AI summary
A fluid pressure cylinder driving device includes a switch valve, a high pressure air supply source, an exhaust port and a check valve. When the switch valve is at a first position, a head side cylinder chamber communicates with the high pressure air supply source, and a rod side cylinder chamber communicates with the exhaust port. When the switch valve is at a second position, the head side cylinder chamber communicates with the rod side cylinder chamber via the check valve, and the head side cylinder chamber communicates with the exhaust port.