Air Cooled Disc Mill Assembly Heat Management
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Solution Overview
Problem
Existing reducing machines face challenges with heat management, including thermal shock, material degradation, and inefficient cooling, which lead to increased costs, material limitations, and reduced productivity due to the use of water cooling systems.
Innovation Solution
The implementation of an air cooling system for both stationary and rotating discs in a disc mill assembly, utilizing air inlets and carrying plates to channel air flow directly over the cooling surfaces, eliminating the need for water jackets and allowing for more uniform heat dissipation and reduced material stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water cooling systems are used to cool the stationary disc, then heat dissipation is effective, but the risk of thermal shock increases and material costs increase
Solution Approach 1:
The patent replaces the water cooling system with an air cooling system. Instead of using liquid water to cool the stationary disc, the invention uses air flow generated by a fan to remove heat from the disc surface. This substitution eliminates the risks associated with water cooling (thermal shock, leakage, rusting) while maintaining effective heat dissipation through increased air flow velocity and surface area exposure.
Solution Approach 2:
The patent changes the cooling medium from water to air, and modifies the cooling mechanism from contact-based water jackets to surface-based air flow. The stationary disc is designed with a smooth surface that allows air to flow directly over it, changing the heat transfer parameters from liquid-to-solid contact cooling to gas-to-solid convection cooling.
2Temperature
If water cooling systems are used, then cooling capability is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The patent extracts and removes the water jacket assembly entirely from the system. Instead of having a complex water cooling infrastructure with jackets, pumps, and circulation systems, the invention uses a simplified air cooling approach where a fan directs air flow over the stationary disc surface, eliminating the need for water-containing components.
Solution Approach 2:
The air cooling system utilizes the existing fan in the reducing machine to generate the cooling air flow. The fan, which is already part of the machine for material processing, doubles as the cooling device by creating air flow over the stationary disc, eliminating the need for a separate cooling system.
3Temperature
If water cooling is applied to a hot stationary disc, then cooling effect is immediate, but catastrophic failure may occur
Solution Approach 1:
The patent replaces water cooling with air cooling to eliminate thermal shock risks. Air has lower heat capacity and thermal conductivity compared to water, resulting in gentler and more uniform cooling that prevents sudden temperature gradients and associated thermal stresses that could cause disc failure.
4Temperature
If water cooling systems are used, then heat management is improved, but material contamination and rusting occur
Solution Approach 1:
The patent substitutes water with air as the cooling medium. This eliminates all water-related problems including leakage, rusting of the stationary disc, and contamination of processed materials. Air cooling provides effective heat management without introducing harmful moisture into the system.
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 air cooling system reduces the risk of thermal shock, decreases material costs, increases productivity, and extends the service life of the discs, while also simplifying maintenance and reducing the generation of off-spec material during initial heating.
Implementation Method 1
air enters through the air inlets and passes between the carrying plate and the rotating air cooling surface, to cool the rotating disc
Implementation Method 2
a second side having a rotating air cooling surface in thermal contact with the rotating cutting surface
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
A reducing machine having an air cooled cutting discs is disclosed. The air cooled discs have cutting surfaces on both sides. The cutting surfaces have edges which are sharpened for cutting input material when the cutting surface is facing the cutting surface of the opposed disc. When the cutting surface of the stationary disc is facing the housing, the cutting surface acts as a heat sink to air cool the stationary disc and the mill assembly in general. Air inlets in the housing lid permit air to flow over the cooling surface of the stationary plate. Air inlets in the carrying plate permit the carrying plate to channel air flow over the rotating cooling surface. A damper restricts air flow over the air cooling surfaces to control the temperature of the reducing machine, such as during start up.