Dual Set Point Temperature Switch with Force Buffer
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Solution Overview
Problem
Temperature control systems face inefficiencies due to hysteresis, requiring two separate switches for widely separated set points, which increases complexity, cost, and modes of failure, while existing solutions are costly and inefficient with multiple moving parts and external power sources.
Innovation Solution
A dual set point temperature control switch is designed using a thermally responsive wax actuator, a spring-biased electric switch, and a force buffer to achieve two widely separated set points with reduced hysteresis, eliminating the need for external power and minimizing moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate temperature control switches are used to achieve widely separated set points, then the desired temperature control is achieved, but the device complexity, cost, and modes of failure increase
Solution Approach 1:
The patent combines two separate temperature control switches into a single integrated device. The first and second switches are merged into one housing with a common actuator mechanism, allowing the device to provide two widely separated temperature set points while reducing complexity, cost, and failure modes associated with using two separate switches
Solution Approach 2:
The single temperature control switch is designed to perform multiple functions by providing two distinct temperature set points. The device can control temperature at either the first set point or the second set point, making it a universal solution that replaces two separate single-function switches
2Measurement precision
If digital temperature control is used to achieve precise temperature control, then temperature accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces digital/electronic temperature control systems with a mechanically actuated switch. The mechanical actuator responds directly to temperature changes and mechanically actuates the switch, eliminating the need for digital sensors, microprocessors, and complex electronic control circuits while maintaining reliable temperature control at two set points
3Ease of operation
If temperature control switch has hysteresis, then the switch responds to temperature changes, but the temperature control accuracy deteriorates
Solution Approach 1:
The patent segments the hysteresis effect into two distinct, controlled hysteresis bands - one for the first temperature set point and another for the second temperature set point. By carefully designing the actuator and spring mechanisms, each hysteresis band is minimized and predictable, allowing for accurate temperature control at both set points despite the inherent hysteresis in the mechanical system
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 reliable operation at two distinct set points with reduced hysteresis, enhancing efficiency and cost-effectiveness by integrating hysteresis in a single switch, reducing complexity and failure modes.
Implementation Method 1
the actuator extends axially in a first direction, going from a first length to a second length. In response to a decrease in temperature, the actuator retracts
Implementation Method 2
The force buffer includes a bias member arranged to compress in response to extension of the actuator in the first direction and to relax in response to retraction of the actuator
Data Source
AI summary
The temperature switch includes a housing, an actuator, a switch, and a force buffer situated between the actuator and the switch. The switch is movable between a first and second state in response to imposition and release of an actuating force FA. The force buffer transmits the actuating force FA from the actuator to the switch when compressed a first distance in the first direction by extension of the actuator in response to an increase in temperature ΔT1. At temperature T1, the force buffer transmits the force FA to move the switch from the first state to the second state. The actuator retracts a second distance in the second direction in response to a decrease in temperature ΔT2. At temperature T2, the force buffer releases the force FA and the switch moves from the second state to the first state.