Shape-Memory Alloy Mixing Unit for Reliable Tap Temperature Control
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Solution Overview
Problem
Existing mixing units for mixer taps are complex to manufacture and require specialized knowledge, making them less reliable and durable compared to alternatives.
Innovation Solution
A mixing unit with a spiral actuating element made of shape memory alloy, which deforms in response to temperature changes to control the flow of hot and cold water, simplifying manufacturing and enhancing reliability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermostatic module with a cup containing thermoexpandable wax is used to actuate the shutter, then the temperature control reliability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces the complex mechanical thermostatic system (cup with thermoexpandable wax, pusher, shutter mechanism) with a shape memory alloy element that directly deforms in response to temperature changes. This substitution eliminates multiple mechanical components while maintaining temperature control functionality, thereby improving reliability without the complexity of the original mechanical system.
Solution Approach 2:
The invention changes the material parameter from conventional thermostatic wax to shape memory alloy, which exhibits superior temperature-responsive deformation characteristics. This material parameter change enables more reliable temperature control with simpler construction, as the shape memory alloy can be directly integrated into the shutter actuation mechanism without requiring additional mechanical transmission components.
2Reliability
If a thermostatic module with multiple components (cup, wax, pusher, shutter) is implemented, then the temperature control efficiency is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent merges multiple separate components (thermostatic element, actuator, shutter mechanism) into a single integrated shape memory alloy element. This consolidation reduces the number of parts that need to be manufactured and assembled, significantly improving ease of manufacture while maintaining the temperature control efficiency through the inherent properties of the shape memory alloy.
Solution Approach 2:
The shape memory alloy element performs multiple functions simultaneously: it senses temperature changes, converts thermal energy to mechanical deformation, and directly actuates the shutter. This self-service capability eliminates the need for separate sensing, actuation, and control components, making the device easier to manufacture while maintaining efficient temperature control.
3Ease of manufacture
If a simple actuating element is used, then the ease of manufacture is improved, but the reliability and durability may deteriorate
Solution Approach 1:
The invention changes the material parameter from conventional simple actuators to shape memory alloy, which provides superior reliability and durability through its unique temperature-responsive properties. This material parameter change enables the actuating element to be both simple in construction (easy to manufacture) and highly reliable, as the shape memory alloy inherently provides consistent, repeatable deformation cycles over long periods.
Solution Approach 2:
The patent employs shape memory alloy, an advanced composite material with tailored properties that combine simplicity of form with high reliability. This composite material approach allows the actuating element to maintain structural integrity and functional consistency under varying thermal conditions, achieving both ease of manufacture and high reliability-durability without requiring complex multi-component designs.
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 a reliable and durable mixing unit that is easy to manufacture, effectively regulating water temperature and flow rates by using a shape memory alloy actuating element that adjusts the shutter position based on temperature, ensuring efficient operation.
Implementation Method 1
The additional box (6) comprises an actuating element (106) made of a shape memory alloy, arranged downstream of the outlet (52) of the cartridge (4), on the passage of the outgoing flow (M1)
Data Source
Figure 1
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Figure 4
AI summary
This mixing unit for a mixer tap comprises a first inlet for a first incoming flow of fluid, a second inlet (50) for a second incoming flow (C1) of fluid having a temperature (Tc) higher than that of the first incoming flow, means for mixing the incoming flows to form an outgoing flow (M1) having an outlet temperature (Tm), an outlet (52) for the outgoing flow, a shutter (72) that is movable between an open position of the second inlet and a closed position of the second inlet, and an actuating element (106) for the shutter, which is disposed at least partially at the outlet so as to deform, depending on the outlet temperature, between a first shape, to move the shutter to the open position, and a second shape, to move the shutter to the closed position. According to the invention, the actuating element is made of a shape-memory alloy.