Pressure Switch Actuation Unit With Trapped Limiter Pocket
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Solution Overview
Problem
In pressure switches, high fluid pressure rise rates can cause the actuator to overtravel and separate from the piston, leading to potential damage or breakage of the switching component due to excessive displacement or force.
Innovation Solution
The actuator and piston are integrated as a single actuation unit with a limiter member that extends outwardly, forming a monolithic structure to prevent overtravel by engaging with a pocket or cavity within the pressure switch body, and a seal arrangement is used to maintain a fluid-tight seal, preventing fluid from reaching the switching component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator and piston are kept as separate components, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates due to potential overtravel and separation under high pressure rise rates
Solution Approach 1:
The actuator and piston are merged into a single integrated actuation unit, eliminating the interface between separate components. This integration ensures that the limiter member on the piston directly controls actuator travel, preventing separation and overtravel even under high pressure rise rates, thereby resolving the reliability issue while accepting increased manufacturing complexity
2Object-affected harmful factors
If the actuator travels freely without integration, then the ease of operation is improved and device complexity is reduced, but the object-affected harmful factors increase due to potential damage to the switching component
Solution Approach 1:
The limiter member is pre-configured on the piston to exert preliminary anti-action on the actuator's travel path. This built-in mechanical constraint proactively prevents the actuator from exceeding its safe travel distance, eliminating the harmful effect of overtravel damage before it can occur, while maintaining smooth operation within the allowed range
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 configuration effectively prevents overtravel of the actuation unit, safeguarding the switching component from damage by ensuring controlled movement and maintaining a sealed environment, thereby enhancing the reliability and durability of the pressure switch.
Implementation Method 1
The actuator 104 is biased in a first direction D1 along the axis A by a spring arrangement 110 of one or more spring members
Implementation Method 2
the actuation unit carries a seal member that provides a fluid tight seal between the actuation unit and the pressure switch body
Data Source
AI summary
A pressure switch includes an actuation unit disposed within a body of the pressure switch and biased in a first direction by a spring arrangement and accessible at a fitting end of the pressure switch to be movable in a second direction against the bias of the spring by fluid at the fitting end. The actuation unit includes a limiter trapped in a pocket to limit the range of travel of the actuation unit, thereby safeguarding the electrical switch element from sustaining damage due to excessive travel. The pocket may be formed by the cooperation of two separate pieces. The spring arrangement may be biased by another piece disposed within a body of the pressure switch.