Leakage detection device and continuous flow heater with same
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Solution Overview
Problem
Existing leak detection systems in electronic instantaneous water heaters fail to reliably detect fluid leaks and accumulations regardless of installation position and are ineffective against small leaks or external fluid ingress.
Innovation Solution
The device employs circumferentially arranged measuring electrodes on the housing base and cover to detect fluid contact by measuring resistance, ensuring reliable leak detection with metal or conductive plastic electrodes, and includes a control unit to deactivate the heating element and provide warnings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float switch with buoyancy element is used in a drip tray, then leakage detection is possible, but the system only triggers when a significant amount of water has accumulated and only functions reliably in upright position
Solution Approach 1:
The patent replaces the mechanical float switch system with an electrical resistance-based detection system. Measuring electrodes are integrated into the housing base and cover, detecting fluid presence through changes in electrical resistance rather than mechanical buoyancy. This substitution eliminates the need for gravitational orientation and enables reliable leak detection in any installation position.
Solution Approach 2:
The measuring electrodes serve multiple functions: they detect leaks in the drip tray area, detect fluid ingress into the heating element housing, and provide early warning of small leaks before significant water accumulation occurs. This multi-functional detection capability makes the system adaptable to various installation positions and leak scenarios.
2Quantity of substance
If a float switch system is used, then leakage detection is achieved, but small leaks that do not immediately lead to substantial water accumulation are not detected
Solution Approach 1:
The measuring electrodes are positioned to detect fluid presence before significant water accumulation occurs in the drip tray. By measuring resistance changes at the electrode-housing interface, the system provides early warning of small leaks, enabling preliminary detection before the leak becomes substantial.
Solution Approach 2:
The electrical resistance measurement system replaces the mechanical float switch, enabling detection of minimal fluid presence through resistance changes rather than requiring sufficient water volume to activate a buoyancy element. This provides superior measurement precision for small leak detection.
3Reliability
If metal conductor elements are used as measuring electrodes, then good electrical conductivity is achieved for detecting small amounts of water, but corrosion resistance and long-term reliability may be compromised
Solution Approach 1:
The patent employs metal conductor elements with corrosion-resistant coatings or treatments, combining the high electrical conductivity of metals with the corrosion protection of protective layers. This composite approach maintains reliable electrical performance while resisting degradation from water exposure and humid environments.
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
Ensures early and reliable detection of leaks and external fluid ingress, preventing damage and user risk by immediate power cutoff and alerts, irrespective of installation orientation.
Implementation Method 1
detect wetting of the measuring electrodes with fluid by measuring the resistance between the measuring electrodes
Implementation Method 2
These metal conductor elements have the advantage of good electrical conductivity, such that their electrical resistance is negligibly small compared to the resistance between the two measuring electrodes when wetted with water
Data Source
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AI summary
The invention relates to a device for heating a fluid, comprising a housing body (10), a fluid inlet (11) and a fluid outlet (12), at least one electric heating unit (13) arranged between the fluid inlet (11) and the fluid outlet (12) and configured for heating the fluid, a control unit (14) configured to control the electric heating unit (13) accordingly to heat the fluid to a predetermined setpoint temperature, a housing cover (15) which is detachably arranged on the housing body (10), and is characterized in that the control unit (13) has a leakage detection device, wherein the leakage detection device comprises at least two measuring electrodes (16, 17) which are arranged at least substantially circumferentially on the housing body (10) and/or the housing cover (15), and the leakage detection device is configured to wet the measuring electrodes (16,17) to detect contact with fluid by measuring the resistance between the measuring electrodes (16, 17), and to provide a leakage detection signal in the event of detected contact. Furthermore, the invention relates to an electronic instantaneous water heater with such a device.