Three-Way Valve Circuit for Progressive Pressure Drop Control
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Solution Overview
Problem
Conventional fluid circuits with 3-way valves face challenges in regulating flow between branches with differing pressure drops, leading to difficult control and increased fuel consumption due to sudden changes in pressure drop and flow rates.
Innovation Solution
A fluid circuit design featuring a three-way valve with an adjustment device comprising pistons and elastic elements that gradually adjust the opening and closing of orifices to manage pressure drop differences between branches, ensuring a progressive pressure drop along the valve stroke without increasing overall system pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple 3-way valve is used to manage flow between branches with different pressure drops, then the valve structure is simple, but the control becomes difficult because flow regulation is only effective along a small part of the piston stroke
Solution Approach 1:
The valve is divided into multiple independent orifices (first orifice and second orifice) that can be controlled separately. Each orifice has its own control mechanism allowing independent regulation of flow to different branches, enabling effective control across the entire piston stroke range rather than just a small portion.
Solution Approach 2:
The valve employs dynamic control mechanisms where pistons can move to different positions to progressively open or close each orifice. This dynamic adjustment capability allows the valve to adapt flow distribution throughout the complete stroke range, making control effective across all positions rather than being limited to a small segment.
2Reliability
If the pressure drop of the low pressure drop branch is increased permanently to reduce flow inversion, then the flow control stability improves, but the overall system pressure drop increases leading to higher fuel consumption
Solution Approach 1:
Instead of permanently increasing pressure drop, the system uses dynamically adjustable orifices that can be opened or closed as needed. This allows the system to maintain stable flow control by actively managing pressure distribution through movable pistons and adjustable openings, rather than relying on fixed high pressure drop that would increase energy consumption.
Solution Approach 2:
The system changes the parameters of the orifices (opening area, position) dynamically based on operating conditions. By adjusting these parameters, the system can maintain stable flow control without permanently increasing pressure drop, thus avoiding the penalty of higher fuel consumption while still preventing flow inversion issues.
3Device complexity
If a simple valve is used without progressive pressure drop adjustment, then the device complexity is low, but sudden changes in pressure drop and flow rates occur making control difficult
Solution Approach 1:
The flow path is segmented into multiple independent channels with separate orifices that can be controlled individually. This segmentation allows progressive adjustment of pressure drop across different branches, preventing sudden changes by distributing the pressure management across multiple controllable elements rather than a single abrupt transition.
Solution Approach 2:
The patent introduces intermediary elements (adjustable orifices, control pistons) between the main pressure source and the branches. These intermediaries provide progressive pressure drop management by gradually adjusting flow resistance, preventing sudden pressure and flow rate changes that would occur with a simple valve design.
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 allows for smoother control of flow rates between branches, reducing sudden changes and minimizing fuel consumption by compensating for pressure drop differences, enhancing the regulation of fluid flow in heavy-duty vehicles.
Implementation Method 1
the first piston is slidably mounted in the central channel and comprises an elastic element for returning it to a position closing the second orifice
Data Source
Figure 1A~1C
Figure 2A~2C
AI summary
The invention relates to a fluid circuit comprising a valve (3), the 3-way valve comprises a central channel (13) into which opens an inlet port (10), a first outlet port (11) and a second outlet port (12), the 3-way valve comprises an adjustment device (2, 3, 4) simultaneously ensuring the opening, respectively the closing of the first port (11) and the closing respectively the opening of the second port (12) of so that the closing speed of the first port (11) is faster than the opening speed of the second port (12).