Fogging Coil Fuse Protection for Over-Temperature Cutoff
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Solution Overview
Problem
Existing battery-powered fog generators face instability due to rapid thermal changes, necessitating safety systems to maintain thermal stability and prevent uncontrolled melting by interrupting current flow upon detecting over-temperature.
Innovation Solution
Implementing safety mechanisms such as fusible wires, low frequency pump motor driving, current measurement, optical sensing, and thermal sensing using thermistors or thermopiles to detect and interrupt current flow when over-temperature is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid energy exchange is used to achieve high vaporization rate, then productivity is improved, but thermal stability deteriorates causing uncontrolled melting
Solution Approach 1:
The fusible wire is pre-installed as a safety mechanism that will automatically melt if temperature exceeds safe limits. This preliminary protective measure is built into the system before operation, allowing high power delivery while having a predetermined fail-safe that activates only under abnormal conditions.
Solution Approach 2:
The fusible wire acts as an intermediary safety component between the power source and the heating coil. It mediates the energy flow by being designed to fail safely at a specific temperature threshold, protecting the main system components from thermal damage while allowing normal high-power operation.
2Reliability
If safety mechanisms are added to prevent overheating, then reliability is improved, but device complexity increases
Solution Approach 1:
The fusible wire provides self-service safety protection without requiring external monitoring systems or user intervention. The wire automatically melts when temperature exceeds the safe threshold, inherently protecting the system through its own physical property (melting point) without adding complex control electronics or sensing mechanisms.
Solution Approach 2:
The fusible wire is designed as a simple, inexpensive sacrificial component that may need replacement after triggering. Rather than using complex, expensive electronic safety systems, the patent employs a simple metal wire with specific melting characteristics that provides reliable protection at minimal cost and 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
Ensures thermal stability and prevents uncontrolled melting by effectively interrupting current flow, enhancing the safety and reliability of battery-powered fog generators.
Implementation Method 1
The fusible wire 1 heats up both by the Joule effect and by the heat that reaches it from the coil 2 by thermal conduction.
Implementation Method 2
The fusible wire 1 heats up both by the Joule effect and by the heat that reaches it from the coil 2 by thermal conduction.
Implementation Method 3
Once a certain critical value is exceeded, generally between 400° C. and 600° C. depending on the application, the fuse wire 1 melts, interrupting, in a manner that cannot be reset by the user, the passage of current.
Implementation Method 4
a hollow metal coil 2 is brought to a temperature of several hundred degrees by applying an electric current and thus exploiting the generation of heat by the Joule effect
Implementation Method 5
This fluid vaporizes upon contact with the metal walls and is expelled at high pressure at the opposite outlet end 5
Implementation Method 6
thermal sensing using thermistors or thermopiles to detect and interrupt current flow when over-temperature is reached
Data Source
AI summary
A safety system for a battery-powered fog generator is described, designed to operate on a vaporization coil (2) of a fogging fluid; the safety system includes: a fuse wire (1), each placed at one end of the coil (2), suitable for heating both due to a Joule effect and through heat coming from the coil (2) by thermal conduction, the fusible wire (1) being therefore designed to melt when its temperature exceeds a melting threshold value, interrupting the power supply from the battery to the coil (2); a sensor (6) designed to detect the temperature of the coil (2) when current flows in it; and a control unit (7) operatively connected to the sensor (6).