Thermostatic Mixing Valve Single Actuator Control
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Solution Overview
Problem
Thermostatic mixing valves with separate controls for water temperature and flow rate are aesthetically limiting and functionally deficient, requiring two hands for simultaneous adjustment and can confuse users about which control adjusts temperature or flow rate.
Innovation Solution
A thermostatic mixing valve with a single manually operable actuator that allows independent or simultaneous adjustment of water temperature and flow rate, using a combination of rotational and pivotal movements about mutually perpendicular axes, incorporating proportioning and flow regulator mechanisms to maintain user-selected temperatures and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate controls are provided for water temperature and flow rate, then each parameter can be controlled independently, but the device complexity increases and ease of operation deteriorates as two hands are required for simultaneous adjustment
Solution Approach 1:
The patent merges the temperature control function and flow rate control function into a single actuator. The actuator has a first degree of freedom (rotation about a first axis) for temperature control and a second degree of freedom (pivoting about a second axis perpendicular to the first axis) for flow rate control. This allows both parameters to be adjusted independently or simultaneously with one hand, resolving the contradiction between independent control capability and ease of operation.
2Adaptability or versatility
If separate controls are provided for water temperature and flow rate, then each parameter can be controlled independently, but the device complexity increases
Solution Approach 1:
The patent combines multiple control functions into a single actuator structure. The actuator includes a first degree of freedom for temperature control and a second degree of freedom for flow rate control, both integrated into one component. This merging approach maintains the adaptability of independent parameter control while reducing device complexity by eliminating the need for separate control mechanisms.
Solution Approach 2:
The single actuator serves multiple functions: it controls water temperature through rotation about the first axis and controls flow rate through pivoting about the second axis. This multi-functional design achieves the versatility of independent parameter control without requiring separate dedicated controls for each function, thereby reducing overall device complexity.
3Reliability
If separate controls are provided for water temperature and flow rate, then temperature can be maintained constant, but the aesthetic design is limited
Solution Approach 1:
The single multi-functional actuator provides a clean, unified aesthetic appearance while maintaining the reliability of constant temperature control. The actuator's integrated design with two degrees of freedom eliminates the visual clutter of separate controls, offering designers greater aesthetic freedom while preserving the thermostatic mixing valve's ability to maintain stable temperature.
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
Enables users to control water temperature and flow rate independently or simultaneously with one hand, reducing confusion and providing a new aesthetic and functional design, while maintaining consistent user-selected temperatures.
Implementation Method 1
the temperature coupling means acts on the valve member via a thermostat arranged to monitor the outlet water temperature and adjust the position of the valve member to maintain the selected outlet water temperature substantially constant
Data Source
AI summary
A thermostatic mixing valve having a manually operable actuator for user selection of water temperature and flow rate, where the actuator is configured to permit both simultaneous and independent adjustment of the water temperature and the flow rate.