Tool Cooling Switchover for Furnace Power Failure Protection
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Solution Overview
Problem
Existing cooling methods for tools in heat-treatment furnaces are ineffective during power failures, as they rely on electric pumps to circulate coolant, leading to thermal damage due to uncontrolled heating.
Innovation Solution
The implementation of electrical control valves that automatically switch from a coolant supply to a municipal water system in case of power failure, ensuring continuous cooling by using standard line pressure to deliver cold water through the tool and drain it back to the sewage system, with spring-biased mechanisms for automatic operation without external intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electric pump is used to circulate coolant through the tool, then cooling efficiency is improved during normal operation, but the system becomes unreliable during power failures
Solution Approach 1:
The system dynamically switches between two cooling modes: normal mode using an electric pump for efficient coolant circulation, and emergency mode using gravity-driven flow from elevated water reservoirs when power fails. This dynamic adaptation ensures reliable cooling under varying operational conditions without requiring a permanently complex dual-system infrastructure.
Solution Approach 2:
The system prepares for power failures by pre-positioning water reservoirs at elevated heights, creating gravitational potential energy that automatically activates when power is lost. This beforehand preparation ensures immediate cooling continuity without requiring active control systems or complex emergency pump mechanisms.
2Reliability
If a complex control system with multiple sensors and automated switchovers is implemented, then cooling reliability during power failures is improved, but device complexity increases
Solution Approach 1:
The control system serves itself by using the failure condition (power loss) to directly trigger the emergency cooling mode. The loss of electrical power simultaneously stops the pump and activates the gravity-driven emergency water flow from elevated reservoirs, eliminating the need for separate sensors, controllers, and actuation mechanisms.
Solution Approach 2:
The system replaces complex electrical control mechanisms with a simple mechanical-gravitational system. Elevated water reservoirs use gravitational force to automatically drive water flow through the tool during emergencies, substituting for what would otherwise require electric pumps, valves, and control circuits.
3Productivity
If coolant is recirculated through a coolant supply system, then cooling efficiency is improved, but the system cannot operate during power failures when pumping stops
Solution Approach 1:
The cooling system is segmented into two independent subsystems: a normal cooling subsystem using recirculated coolant through an electric pump, and an emergency cooling subsystem using fresh water from elevated reservoirs driven by gravity. This segmentation allows each subsystem to operate independently according to power availability, ensuring continuous cooling productivity without complicating the overall system operation.
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
This solution ensures the tool remains cooled and protected from thermal damage during power outages, automatically switching to emergency cooling without manual intervention and maintaining cooling efficiency by using municipal water, thus preventing overheating.
Implementation Method 1
the control valves with a are biased with a spring force into the emergency position and the opposite position of the control valves is effected by supplying power that overcomes the spring force
Implementation Method 2
The municipal water is fed into the tool by the standard line pressure
Data Source
AI summary
The invention relates to a method for cooling a tool in a heat treatment furnace, wherein: the tool is supplied during normal cooling operation with coolant from a coolant reservoir through a supply inlet (1), which coolant is returned into the coolant reservoir from the tool via a return flow (2); the supply inlet (1) is coupled by means of an electric actuator (3) alternatively to the coolant reservoir or to the public water supply and the return flow (2) is coupled by means of a further electric actuator (3) alternatively to the coolant reservoir or to the public waste water system (4); the actuators (3, 3′) are supplied with a feed current during normal cooling operation and held in a first position in which coolant is supplied to the tool through the supply inlet (5) from the coolant reservoir and the coolant is fed back through the return flow (2, 6) into the coolant reservoir; and, upon interruption in the power supply, the actuators (3, 3′) are forced into an emergency position in which cold water is supplied to the tool through the supply inlet (7) from the public water supply and the water is discharged through the return flow (2, 8) into the public waste water system (4).