Inverting Valve Diaphragm Structure for Low-Loss Fluid Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional diaphragm-type fluid control valves face challenges with complex designs, added costs, and pressure loss due to the use of ribs, rings, and springs for biasing, which complicate manufacturing and assembly, and can cause vibrations damaging the diaphragm.
Innovation Solution
A diaphragm with a simplified configuration featuring a smooth upper surface and a reinforced fabric embedded in a rubber matrix, which naturally inverts to seal without additional biasing elements, minimizing stress concentrations and facilitating easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If ribs, rings, and springs are added to the diaphragm for biasing, then the diaphragm can be urged to the closed position, but the manufacturing complexity and assembly complexity increase
Solution Approach 1:
The patent removes the complex biasing elements (ribs, rings, springs) from the diaphragm structure entirely. Instead, it relies on the natural elasticity of the diaphragm material and the pressure differential across the diaphragm to provide the necessary closing force, thereby simplifying the diaphragm structure while maintaining the required bias force.
Solution Approach 2:
The diaphragm is designed to utilize its own elastic properties and the fluid pressure differential to generate the closing force. The diaphragm naturally returns to its closed position when pressure is applied, eliminating the need for external biasing devices and making the system self-regulating.
2Force
If ribs, rings, and springs are added to the diaphragm for biasing, then the diaphragm can be urged to the closed position, but the manufacturing cost increases
Solution Approach 1:
By removing the need for ribs, rings, and springs, the patent significantly simplifies the manufacturing process. The diaphragm can be manufactured as a simple elastomeric membrane without complex structural features, reducing material costs, manufacturing steps, and quality control requirements.
Solution Approach 2:
The patent changes the approach from adding structural complexity to optimizing material properties. By selecting appropriate elastomeric materials with suitable durometer hardness and tensile strength, the diaphragm achieves the required mechanical performance through material parameter selection rather than structural complexity.
3Force
If springs are used as biasing devices, then the diaphragm can be forced to the closed position, but pressure loss increases
Solution Approach 1:
The patent replaces the mechanical spring system with a fluid pressure-based system. The closing force is generated by the pressure differential across the diaphragm rather than a mechanical spring, eliminating the energy losses associated with spring compression and mechanical friction.
Solution Approach 2:
The patent uses fluid pressure (pneumatics or hydraulics) to provide the closing force on the diaphragm. The pressurized fluid acts directly on the diaphragm surface area to generate the required force, which is more efficient than mechanical spring systems and avoids the pressure losses inherent in mechanical biasing devices.
4Force
If additional biasing devices are added to the valve, then the diaphragm can be urged to the seated position, but the assembly complexity increases
Solution Approach 1:
The patent merges the biasing function into the basic diaphragm structure and valve body design. The diaphragm's elastic properties and the valve body's pressure chamber configuration work together to provide the closing force, eliminating the need for separate biasing devices and simplifying the overall valve assembly.
Solution Approach 2:
The diaphragm serves multiple functions: it acts as the flow control element, the sealing element, and the biasing element. By making the diaphragm multi-functional, the patent eliminates the need for separate components and reduces the overall complexity of the valve assembly.
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 provides precise control of fluid flow and pressure with reduced wear and complexity, eliminating the need for additional biasing devices, thus enhancing reliability and performance while minimizing pressure loss.
Implementation Method 1
a reinforced fabric embedded in a rubber matrix
Implementation Method 2
a flexible diaphragm element to control fluid flow
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A fluid control valve includes a cover portion and a body portion. Inner surfaces of the cover and the body portion define a chamber that includes an inlet and an outlet in communication with the chamber. The fluid control valve also includes a diaphragm disposed between the cover portion and the body portion. The diaphragm has a flexible member that is disposed within the chamber for controlling communication between the inlet and the outlet. The upper surface of the flexible member has a substantially smooth wall portion. The flexible member has an inverted position in which the upper surface conforms to at least a portion of the inner surface of the cover portion to define a passageway that permits communication between the inlet and the outlet. The diaphragm is configured such that the lower surface of the flexible member and a seat member on the body portion have corresponding radius of curvatures such that the flexible member conforms to and seals against the seat member when the flexible member is not in the inverted position.