Automatic kettle locking systems for popcorn machines
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Solution Overview
Problem
Conventional popcorn machines with fire containment/suppression systems struggle to prevent the spread of fires in wider cabinets, as existing systems require a 45-second delay in activating fire extinguishing agents, which can cause fires to spread when the kettle is dumped, especially in machines with doors wider than three feet.
Innovation Solution
An automatic kettle locking system that locks the popping kettle in an upright position when the temperature exceeds a normal operating range but is below the fire ignition point, preventing the kettle from being dumped and allowing fire suppression systems to contain and extinguish fires effectively without spreading to the popcorn below.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the kettle is allowed to be dumped during high temperature operation, then the operator can empty the kettle of remaining contents, but burning oil can be poured onto popped corn causing the fire to spread
Solution Approach 1:
The locking system applies a counter-action (locking) in advance when high temperature is detected, preventing the harmful action of dumping burning oil onto popcorn before the fire suppression system can activate
Solution Approach 2:
The system locks the kettle in the upright position as a preliminary safety measure when temperature exceeds the threshold, ensuring the kettle cannot be dumped during the critical 45-second delay period before fire suppression activation
2Reliability
If the fire suppression system is activated with a 45-second delay after fusible link breakage, then the system can contain the fire within the cabinet, but the kettle can be dumped during this delay causing fire to spread to popcorn
Solution Approach 1:
The locking system preemptively prevents the harmful dumping action during the 45-second delay period by engaging the lock mechanism when high temperature is detected, counteracting the potential operator action that would spread fire
Solution Approach 2:
The locking system acts as an intermediary safety mechanism between the temperature detection system and the fire suppression system, bridging the gap during the 45-second delay by preventing kettle dumping
3Area of stationary object
If the cabinet width is increased to four feet or more for commercial popcorn machines, then the machine can handle larger volumes, but existing fire containment systems become less effective at preventing fire spread
Solution Approach 1:
The locking system performs a preliminary protective action by securing the kettle in the upright position before fire can spread in the larger cabinet space, providing an additional safety layer that compensates for the increased fire spread risk in wider cabinets
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
The kettle locking system eliminates the risk of fire spreading by maintaining the kettle in an upright position during high temperatures, allowing existing fire suppression systems to effectively contain and extinguish fires within the cabinet, even in wider popcorn machines, thereby enhancing safety and compliance with safety tests.
Implementation Method 1
a solenoid (232) configured to lock the arm (114) in the upright position when the temperature of the popping kettle (107) exceeds a predetermined threshold
Implementation Method 2
a bi-metallic strip (233) operably connected to the solenoid (232) and configured to open an electrical circuit to the solenoid (232) when the temperature of the popping kettle (107) exceeds the predetermined threshold
Data Source
AI summary
Systems and methods for preventing dumping of a popping kettle in a popcorn machine above a preset temperature to facilitate fire containment are disclosed herein. In some embodiments, a popcorn machine can include one or more temperature control systems to prevent the popping kettle from exceeding a normal operating temperature range. In the event such systems fail, however, embodiments of the present technology include lock systems that will lock the popping kettle in an upright position before the kettle reaches a temperature that will ignite the popping oil. Locking the popping kettle in this manner prevents an operator from inadvertently dumping burning oil onto popcorn piled in the bottom of the cabinet, igniting the popcorn and causing the fire to spread. Locking the kettle can also provide additional time for a fire suppression system to extinguish the fire while it is contained in the kettle.