Switching Spring Protection in Rod Controllers
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Solution Overview
Problem
Existing switching devices in rod controllers face issues with overpressing or damaging the switching spring due to the small working travel and lack of resilient spring bases, leading to high manufacturing and installation costs for override protection mechanisms.
Innovation Solution
A switching device with a thermomechanical temperature detection system using a sensor that generates relative movement between a tube and rod, actuating a switch with an elastic switching spring and a separate elastic spring base, which absorbs bending forces and allows for free movement of the switching spring, preventing damage and reducing the need for additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small working travel of around 1 mm is provided for the switching spring, then the switching device can be compact, but the switching spring is at risk of being overpressed or damaged
Solution Approach 1:
The switching mechanism is divided into two separate components: a switching spring for actuation and a resilient spring base for mounting. This segmentation allows the spring base to absorb excess movement and protect the switching spring from overpressing, while maintaining a compact overall structure.
Solution Approach 2:
The resilient spring base acts as an intermediary between the sensor and the switching spring. It absorbs bending forces and relative movements, preventing direct transmission of excessive forces to the switching spring, thereby protecting it from damage while enabling compact design.
2Reliability
If override protection mechanisms are added to prevent overpressing, then the switching spring is protected, but the manufacturing and installation costs increase
Solution Approach 1:
The protective function is merged into the spring base itself, which is already a necessary component for mounting the switching spring. The spring base combines structural support, resilient protection, and mounting functions in a single element, eliminating the need for separate override protection mechanisms.
Solution Approach 2:
The resilient spring base provides self-protection for the switching spring through its inherent elasticity and bending capability. The structure automatically absorbs excess forces without requiring additional protective components or complex adjustment mechanisms, simplifying both manufacturing and installation.
3Device complexity
If the switching spring is directly connected to the sensor, then the structure is simple, but the switching spring cannot move freely and is prone to damage
Solution Approach 1:
The direct connection between sensor and switching spring is segmented by introducing a resilient spring base as an intermediate mounting element. This allows the switching spring to move freely relative to the spring base while maintaining structural simplicity through the integrated 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
The solution prevents overpressing and damage to the switching spring by allowing a larger movement path and reducing manufacturing complexity, while maintaining effective temperature detection and switching functionality.
Implementation Method 1
the sensor generates a relative movement due to a different thermal expansion behavior of different sensor parts, in particular a tube and a rod in it
Implementation Method 2
Due to the elasticity of the spring base between its attachment to the switching device on the one hand and the connection to the switching spring on the other hand
Data Source
Figure 1A~3
Figure 1B
Figure 4~8
AI summary
The device i.e. rod controller (11), has a switching spring that is connected to right ends of a flexible spring base (27) and supported to the spring base. The spring and base run in a same direction with a flat angle. The base is fastened to an end of the device turned away from a connection area. A thermo-mechanical temperature detecting device that includes a sensor (14) engages with a relative movement in proximity to the connection area between the spring and the base for execution of the switching movement.