Helical Thermostatic Cartridge Adjustment for Fine Temperature Control
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Solution Overview
Problem
Existing sanitary thermostatic mixing valves lack the ability to provide high mixed water temperatures while allowing for fine temperature adjustments and ensuring user safety from scalding, as they typically limit rotation to 360° and lack effective mechanisms for disinfection with hot water.
Innovation Solution
A sanitary thermostatic mixing valve with a helically or spirally designed guide track for the stop body, allowing the rotary handle to rotate more than 360°, enabling fine adjustment of mixed water temperature and incorporating an intermediate stop for safe high-temperature settings, with the stop body movable in radial or axial directions to overcome design constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotary handle is limited to 360° rotation, then the device structure is simple, but the mixed water temperature cannot be adjusted finely and high temperatures for disinfection cannot be achieved
Solution Approach 1:
The guide track is designed with a curved geometry (arc-shaped or helical) instead of a straight line, allowing the stop body to traverse more than 360° of rotation. This curved path enables the rotary handle to rotate through multiple cycles while the stop body follows the curved guide track, achieving fine temperature adjustment and high-temperature disinfection capability without requiring a completely different mechanical structure
Solution Approach 2:
The guide track extends into a third dimension by using a helical or arc-shaped path in space. Instead of a simple linear guide track in one dimension, the track is configured to wind through multiple rotations in three-dimensional space, allowing the stop body to achieve greater than 360° rotation while maintaining a compact device structure
2Adaptability or versatility
If the rotary handle rotates more than 360°, then fine temperature adjustment and high-temperature disinfection are enabled, but the risk of scalding increases
Solution Approach 1:
A safety stop is introduced as an intermediary element within the guide track at a position corresponding to a safe maximum temperature. This safety stop acts as a mechanical mediator that prevents the stop body from being positioned beyond the safe temperature range, thereby eliminating scalding risk while still allowing the rotary handle to rotate more than 360° for fine adjustment and disinfection functions
Solution Approach 2:
The guide track with its curved geometry and integrated safety stop provides self-regulating functionality. The mechanical structure itself enforces the safe temperature limit through the safety stop position, and the system automatically prevents dangerous configurations without requiring external control systems or user intervention
3Reliability
If a safety mechanism is added to prevent scalding, then user safety is improved, but the device complexity increases
Solution Approach 1:
The safety stop function is merged into the existing guide track structure. Instead of adding a separate safety mechanism as an independent component, the safety function is integrated directly into the guide track's geometry, where the track's shape and the safety stop's position work together to enforce temperature limits. This merging approach provides safety functionality while minimizing additional structural complexity
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 the achievement of high mixed water temperatures for disinfection while allowing for precise temperature adjustments beyond 360° rotation, ensuring user safety by allowing the mixed water temperature to be set between minimum and maximum safe levels.
Implementation Method 1
A thermostatic element, particularly designed as an expansion element, is located between the inlets and the mixed water outlet
Data Source
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AI summary
The invention relates to an adjustment unit (1) for a thermostat cartridge (2), wherein the adjustment unit (1) comprises a rotary handle (3), a movable stop body (4) and a guide track (5) for the stop body (4), wherein the guide track (5) is spiral or helical in shape.