Thermostatic Mixing Unit Stop Mechanism for Overpressure Seal Integrity
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Solution Overview
Problem
Existing mixer taps with thermostatic means are prone to ejection during accidental overpressure events, leading to leaks and safety hazards due to the failure of thermostatic elements to maintain tightness.
Innovation Solution
A mixing unit with a thermostatic element that includes a heat-sensitive part and a moving part, where a stop limits the travel space of the thermostatic element outside its housing, ensuring the sealing of the housing remains intact even under overpressure, and a peripheral sealing gasket guarantees tightness by being in annular contact with the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thermostatic element is allowed to move freely in response to temperature changes, then the thermostatic control function is improved, but the element may be ejected during accidental overpressure events causing leaks and safety hazards
Solution Approach 1:
The patent applies preliminary anti-action by providing a stop that preliminarily prevents the harmful ejection of the thermostatic element during overpressure events. The stop is positioned to counteract the excessive outward movement that could occur under abnormal pressure conditions, thereby preventing the ejection hazard before it can manifest while still allowing normal thermostatic operation.
Solution Approach 2:
The stop is pre-positioned in the housing to define a limited travel space for the thermostatic element. This preliminary arrangement ensures that even under accidental overpressure, the element cannot move beyond the predetermined safe position, preventing ejection while maintaining normal thermostatic responsiveness within the constrained range.
2Object-affected harmful factors
If the thermostatic element travel space is limited by a stop, then the ejection hazard is prevented, but the thermostatic responsiveness may be restricted
Solution Approach 1:
The stop is strategically positioned to provide localized constraint only in the direction of potential ejection, while leaving the thermostatic element free to move within the limited travel space in response to normal temperature variations. This local quality approach ensures that the constraint applies only where needed to prevent harm, without unduly restricting the element's functional responsiveness.
3Reliability
If the thermostatic element can move to seal the hot water passage, then the temperature control function is improved, but the seal may fail during overpressure events causing hot water leaks
Solution Approach 1:
The stop provides preliminary protection against the seal failure that could occur during overpressure events. By limiting the thermostatic element's travel space, the stop prevents the element from moving to positions where it could fail to maintain the seal on the hot water passage, thereby preventing hot water leakage while still allowing the element to move sufficiently for normal temperature control.
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
Prevents leaks by ensuring the thermostatic element's movement is restricted, maintaining the seal and preventing the hot water passage from opening, thus enhancing safety and reliability.
Implementation Method 1
a thermostatic element (73; 173; 273) including both a heat-sensitive part (75; 175) arranged at least partially in the outlet, and a moving part (77) translatable relative to the heat-sensitive part
Data Source
AI summary
A mixing unit for a mixer tap has a first intake for a first incoming stream, and a second intake for a second incoming stream. The mixing unit mixes the first and second incoming streams in order to form an output stream, and has an outlet for the output stream. A thermostat includes a heat-sensitive portion and a translationally movable portion along an axis. A seal of the second intake is connected to the movable portion. A recess connects the outlet with the second intake and housing and is sealed by the heat-sensitive portion and the translationally movable portion. The outlet has an abutment to restrain the translational movement of the heat-sensitive portion along the axis, in a direction parallel to the axis and opposite to the seal. The abutment limits the movement of the heat-sensitive portion and the translationally movable portion outside of the recess to avoid breaking the tight seal.