Dual-Diaphragm Fluid Control Valve for Pressure Fluctuation Stability
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Solution Overview
Problem
Conventional fluid control valves, such as those described in JP 2007-148465 A and JP 2001-099344 A, fail to account for fluctuations in primary pressure, leading to instability and issues like dust or debris generation due to sliding resistance between components.
Innovation Solution
A fluid control valve design incorporating a first and second diaphragm between the valve element and the body, with a diaphragm chamber separating the valve and back pressure chambers, ensuring a stable operation by maintaining a predetermined relationship between the effective pressure receiving areas of the diaphragms and the passage area in the valve seat, thus neutralizing the impact of primary and secondary pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure regulating shaft with lip packing is used to control secondary pressure, then pressure regulation function is achieved, but sliding resistance generates dust or debris and causes operational instability
Solution Approach 1:
The invention extracts and eliminates the pressure regulating shaft and lip packing components that cause sliding resistance and debris generation. Instead, it uses a diaphragm-based mechanism where the valve element is directly actuated by diaphragm movement, removing the source of the harmful sliding friction and particle generation while maintaining pressure regulation functionality
Solution Approach 2:
The invention replaces the mechanical sliding contact system (pressure regulating shaft and lip packing) with a diaphragm-based flexible membrane system. The diaphragm transmits pressure forces without sliding contact, substituting the problematic mechanical friction-based mechanism with a flexible, debris-free alternative that eliminates dust generation
2Reliability
If conventional pressure regulator design is used, then simple structure is maintained, but fluctuations in primary pressure cause instability in operation
Solution Approach 1:
The invention segments the pressure control function into two independent diaphragm chambers: a first diaphragm chamber that responds to primary pressure fluctuations and a second diaphragm chamber that responds to secondary pressure. This segmentation allows each diaphragm to independently compensate for different pressure variations, stabilizing valve operation while maintaining a relatively simple integrated structure
Solution Approach 2:
The invention changes the operational parameters by using two diaphragms with different effective areas that can independently respond to pressure changes. The first diaphragm area is designed to compensate for primary pressure fluctuations, while the second diaphragm area compensates for secondary pressure changes, allowing the system to adapt to varying pressure conditions without increasing structural complexity
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
The solution ensures stable fluid control valve operation by maintaining a balance of forces, preventing instability and reducing sliding resistance, which in turn minimizes dust or debris generation, even with fluctuations in primary and secondary pressures.
Implementation Method 1
A difference between an effective pressure receiving area of the first diaphragm and an effective pressure receiving area of the second diaphragm is equivalent to a passage area in the valve seat
Data Source
AI summary
A first diaphragm and a second diaphragm are disposed between a valve element and a body, a diaphragm chamber is formed between the first diaphragm and the second diaphragm, the first diaphragm separates a valve chamber from the diaphragm chamber, and the second diaphragm separates the diaphragm chamber from a back pressure chamber. The diaphragm chamber communicates with an output port, the valve chamber and the back pressure chamber communicate with an input port. A difference between an effective pressure receiving area of the first diaphragm and an effective pressure receiving area of the second diaphragm is equivalent to a passage area in a valve seat.