Thermomechanical Slide Valve Control for Hot Water Recirculation
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Solution Overview
Problem
Existing flow control devices for hot water in sanitary facilities are complex, expensive, and difficult to adjust, relying on electricity or bimetallic components to manage temperature-based fluid flow.
Innovation Solution
A thermomechanical actuator-driven flow control device with a slide valve and hysteresis-inducing arrangements, utilizing thermal expansion and mechanical friction to control fluid flow based on temperature, without the need for electricity, allowing adjustable temperature settings and integration into a cartridge for easy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric valves or bimetallic shutters are used to control hot water flow, then temperature control performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex electric valves or bimetallic shutters with a simpler thermomechanical actuator system. The actuator uses a thermally expandable material that directly converts thermal energy into mechanical motion to drive the slide valve, eliminating the need for electronic components or complex bimetallic mechanisms while maintaining reliable temperature-based flow control
Solution Approach 2:
The patent utilizes thermal expansion of a thermally expandable material within the thermomechanical actuator to directly drive the slide valve. As the material expands or contracts in response to temperature changes, it mechanically actuates the valve without requiring external power sources or complex control systems, thereby reducing device complexity while preserving temperature control functionality
2Loss of time
If recirculation is initiated as soon as water temperature falls below a predetermined temperature, then hot water availability is improved, but energy loss increases
Solution Approach 1:
The patent implements preliminary action by pre-heating water in the recirculation loop before it reaches the draw-off point. The thermomechanical actuator proactively opens the recirculation path when temperature drops, ensuring hot water is already moving toward the outlet before the user activates the tap, thereby reducing waiting time without requiring excessive recirculation
Solution Approach 2:
The patent employs dynamic control of the recirculation system through the thermomechanical actuator, which continuously adjusts the slide valve position based on real-time temperature conditions. This dynamic adjustment allows the system to optimize the balance between hot water availability and energy consumption by opening recirculation only when and where needed, rather than maintaining constant high-flow recirculation
3Adaptability or versatility
If control devices are made adjustable by users, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent enables user adjustability through simple mechanical modifications to the thermomechanical actuator, such as adjusting spring pre-load or selecting different thermally expandable material configurations. These parameter changes allow users to customize temperature thresholds or flow characteristics without requiring complex electronic controls or multiple components, maintaining device simplicity while improving adaptability
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 device provides efficient and reliable flow control, reducing manufacturing costs and user complexity while maintaining performance, ensuring hot water availability without frequent recirculation.
Implementation Method 1
a body (33), which contains a thermally expandable material (34) and which, together with this thermally expandable material (34), forms a heat-sensitive part (35) of the thermomechanical actuator (30) arranged in the chamber (11)
Implementation Method 2
The mechanical friction elements comprise a rigid relief (117), which is provided on a first component from the casing (110) or the slide valve (120) and which interferes axially with a flexible portion of the second component of the casing and the slide valve to generate said resistance
Data Source
AI summary
A fluid control device includes a slide valve movable in a chamber along an axis between a closed position, in which the slide valve is pressed axially against a fixed seat, and an open position, in which the slide valve is axially separated from the seat and a thermomechanical actuator, which is able to drive the slide valve depending on the temperature of the fluid in the chamber and which includes both a thermostatic element, including a fixed piston, and a body forming a heat-sensitive part of the thermomechanical actuator, arranged inside the chamber The piston being mounted with the ability to move along the axis on the body so that the piston deploys against the body when the thermally expandable material expands, and a return spring, interposed axially between the casing and the body so as to retract the piston away from the body when the thermally expandable material contracts.