Single-Tapping Boiler Probe for Low Water and Temperature Sensing
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Solution Overview
Problem
Conventional boiler systems require multiple tappings for water level and temperature monitoring, leading to costly redesigns and potential 'run-away boiler' conditions due to the inability to combine these functions in a single probe without draining the system.
Innovation Solution
A dual-function probe that combines low water cutoff and temperature sensing capabilities within a single unit, utilizing a resilient flexing connection and conductive nut for electrical communication, allowing integration into existing tappings without the need for additional holes, and featuring a microcontroller for monitoring and software filtering to prevent unsafe conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple tappings are installed for separate water level and temperature monitoring, then measurement functions are complete, but boiler redesign cost and structural complexity increase
Solution Approach 1:
The patent combines water level monitoring and temperature monitoring into a single dual-function probe that can be inserted through one tapping. The probe includes both a low water cutoff sensor and a temperature sensor, eliminating the need for separate probes and multiple tappings, thus reducing structural complexity while maintaining complete measurement functionality.
Solution Approach 2:
The single probe serves multiple functions: it performs both water level detection (via the low water cutoff sensor) and temperature measurement (via the temperature sensor). This multi-functional design allows one component to replace what previously required two separate components and two separate tappings.
2Device complexity
If a single dual-function probe is used, then boiler structure is simplified, but the ability to replace sensors without draining the boiler is lost
Solution Approach 1:
The probe is designed as a modular assembly where the low water cutoff sensor and temperature sensor are separate, interchangeable components that can be independently replaced. The low water cutoff sensor can be removed and replaced without affecting the temperature sensor, and both can be replaced without draining the boiler, as long as the probe remains inserted in the tapping.
3Device complexity
If temperature sensor is not in the boiler, then system is simpler, but run-away boiler conditions occur
Solution Approach 1:
The control system continuously monitors the temperature sensor output and uses this feedback to regulate burner operation. When the temperature exceeds a predetermined threshold, the control system automatically shuts off the burner, preventing run-away boiler conditions. The system maintains simple operation while ensuring safety through continuous temperature monitoring and automated feedback 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
Enables safe and efficient operation by eliminating the need for multiple tappings, ensuring accurate water level and temperature monitoring, and preventing 'run-away boiler' scenarios through visual indicators and software-controlled burner operation.
Implementation Method 1
When the water level is above the level of the probe, the circuit between the conductive surfaces is closed by virtue of the conductivity of the water surrounding the probe. When the water level falls below the probe, there is no conductivity between the metal conductive surfaces.
Implementation Method 2
The capsule or well houses a thermocouple, while conducting heat energy from the surface of the well to the temperature sensor.
Data Source
AI summary
A dual functionality temperature control measurement and low water cutoff measurement system is taught within a single tapping to a boiler. This dual functionality combines a low water cutoff and temperature sensor into one control utilizing a sensing element suitable for use in a single existing tapping for a boiler. Independent of low water functionality, the temperature sensor is also capable of monitoring temperature as a replacement probe in an existing temperature sensor-only well. A conductive member provides a compression fit inside the probe well for thermistors, while simultaneously providing conduction with the well interior for a low water cutoff signal in a two-conductor well.