Pressure Switch Diaphragm Clamping for High-Pressure Tightness
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Solution Overview
Problem
Conventional pressure switches in the construction machinery field face challenges with pressure tightness, particularly when handling high-pressure fluids, as they are prone to deformation due to differential pressures, leading to leakage and reduced reliability.
Innovation Solution
A pressure switch design featuring a diaphragm with a thin plate shape, a cap, a stopper, and a ring-shaped member, where the diaphragm unit is clamped by a body with a ring-shaped member to prevent deformation, ensuring equal pressure inside and outside the storage space and reducing stress concentrations, thereby enhancing pressure tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure fluid is introduced into the storage space of the diaphragm unit, then the pressure switch can function to switch on and off depending on pressure variation, but differential pressure causes deformation that moves the cap away from the stopper in the outer circumference section, reducing pressure tightness
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs specifically at the outer circumference section of the cap and stopper where deformation occurs. This localized reinforcement addresses the specific problem area without requiring overall thickening of all components, thus maintaining pressure tightness while avoiding excessive deformation in the critical outer circumference region.
Solution Approach 2:
The cap and stopper are segmented into different thickness regions, with the outer circumference section having increased thickness compared to the central portion. This segmentation allows the structure to provide additional strength where needed (at the edges prone to deformation) while maintaining flexibility and functionality in the central area for pressure sensing operations.
2Reliability
If the diaphragm unit is made with thin plate shape for sensitivity, then it can deflect properly to switch the element, but it becomes more susceptible to deformation under differential pressure
Solution Approach 1:
The diaphragm unit employs local quality by having different thickness characteristics in different regions. The central portion remains thin to maintain sensitivity and deflect properly for switching function, while the outer circumference section has increased thickness through reinforcement ribs to resist deformation under differential pressure. This creates an optimized structure that balances sensitivity and strength.
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 effectively suppresses deformation of the stopper and cap, maintaining pressure tightness and preventing leakage, even under high-pressure conditions, by ensuring the ring-shaped member comes into pressure contact with the outer circumference section and accommodating the diaphragm unit within the body.
Implementation Method 1
a diaphragm with a thin plate shape configured to deflect in an out-of-plane direction depending on pressure variation on a first surface of front and back surfaces
Implementation Method 2
the ring-shaped member comes into pressure contact with the outer circumference section
Data Source
AI summary
A pressure switch is provided which enables an increased pressure tightness. A pressure switch comprises a diaphragm, a cap to define a storage space for pressure fluid, a plate-shaped stopper configured to limit a position of the diaphragm in the event of pressure variation to define a working position, a coupling section for coupling outer circumferences of the diaphragm, the cap and the stopper to form a diaphragm unit, a ring-shaped member formed with a substantially same diameter as the diaphragm unit, a switch element, and a body (a tubular section of a joint section and a switch holding tube) configured to accommodate the ring-shaped member and the diaphragm unit while clamping an outer circumference section of the diaphragm unit together with the ring-shaped member so that the ring-shaped member comes into pressure contact with the outer circumference section.