Melting Device With Triangular Heating Tubes
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Solution Overview
Problem
Existing devices for melting granular energetic materials are energy-intensive, lead to safety risks due to inhomogeneous melting and self-ignition concerns, and require discontinuous operation with significant material maintained in a molten state.
Innovation Solution
A device with a thermostatically controlled chamber and a grid of heating elements, where springs with non-adjoining turns prevent grain passage, ensuring continuous and progressive melting while minimizing energy consumption and self-ignition risks, by using a heat transfer fluid and triangular-section tubes for efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If thermostatically controlled liquid circulation in enclosure walls is used for melting, then melting function is achieved, but energy consumption increases and large quantity of material must be maintained in molten state
Solution Approach 1:
The enclosure is divided into multiple heating zones with independent temperature control. Each zone contains heating elements that can be controlled separately, allowing selective melting of material in specific regions rather than maintaining the entire enclosure at melting temperature. This reduces both energy consumption and the quantity of material that must be kept molten.
Solution Approach 2:
Different regions of the enclosure are assigned different thermal characteristics. The lower portion where material is evacuated has enhanced heating capacity, while upper regions have reduced heating. This localized quality distribution optimizes energy use by concentrating thermal energy where it is most needed for melting and evacuation, rather than uniformly heating the entire system.
2Temperature
If thermostatically controlled liquid circulation is used, then melting is achieved, but temperature gradient between periphery and core creates inhomogeneous molten charge
Solution Approach 1:
The heating system is segmented into multiple independent heating zones with separate temperature control. This allows the periphery (in contact with heated walls) and core regions to be heated at different rates and to different temperatures, enabling better control over temperature distribution and reducing thermal gradients that cause inhomogeneity.
Solution Approach 2:
The heating elements operate in periodic cycles with varying intensity. During certain phases, peripheral heating is intensified to melt material near walls; during other phases, core heating is enhanced. This periodic variation in heating patterns helps equalize temperature distribution over time, preventing persistent thermal gradients and improving molten charge homogeneity.
3Temperature
If electrical resistors in rod form are introduced into material, then heating is achieved, but localized hot spots are created which are dangerous for energetic material
Solution Approach 1:
The heating function is extracted from discrete point-source electrical resistors and distributed across extended surface-mounted heating elements along the enclosure walls. This redistribution of the heating function from concentrated points to distributed surfaces eliminates localized hot spots while maintaining effective heating capability throughout the material volume.
Solution Approach 2:
The enclosure walls serve as an intermediary thermal medium between the heat source and the material. Instead of direct contact heating elements, the walls are heated by thermostatically controlled liquid circulation and then transfer heat to the material through conduction and convection. This intermediary approach provides more uniform heat distribution and prevents localized overheating.
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 solution enables continuous, energy-efficient melting with reduced risk of self-ignition and minimal molten material retention, ensuring homogeneous melting and improved safety during the process.
Implementation Method 1
an enclosure (3) made of sheet steel which is connected at its lower part to a thermostatically controlled chamber (4) intended to receive the molten material
Implementation Method 2
The tubes (7) are not contiguous and there remains between each tube a longitudinal slot (8)
Implementation Method 3
there circulates a heat transfer fluid which is heated by a boiler (not shown)
Implementation Method 4
the means making it possible to prevent the passage of the grains through the grid comprise springs with non-adjoining turns which are placed in the slots separating the tubes
Implementation Method 5
When the material is melted, it is evacuated by gravity through a valve arranged in the lower part of the enclosure
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The fusion device comprises an enclosure (3) connected to a thermostated chamber (4) receiving a molten material (2) in its lower part, a grid (6) formed by heating elements for separating the enclosure from the thermostated chamber, and a unit to prevent the passage of grains from the material through the grid. The heating elements of the grid are parallel tubes (7) or hollow components within which a coolant reaches a temperature greater than the melting temperature of the material. The thermostated chamber is maintained in a temperature by a hot casing (5) covering walls of the chamber. The fusion device comprises an enclosure (3) connected to a thermostated chamber (4) receiving a molten material (2) in its lower part, a grid (6) formed by heating elements for separating the enclosure from the thermostated chamber, and a unit to prevent the passage of grains from the material through the grid. The heating elements of the grid are parallel tubes (7) or hollow components within which a coolant reaches a temperature greater than the melting temperature of the material. The thermostated chamber is maintained in a temperature by a hot casing (5) covering walls of the chamber. The bottom of the enclosure is heated by the casing. The tubes are connected at each end to a connection casing, which is connected to the hot casing, and have a triangular section. A tip of the triangle is directed towards the enclosure, and a base of the triangle opposite to the tip is directed towards the thermostated chamber. The unit to prevent the passage of grains comprises non-joint coil springs, which are placed in slits separating the tubes. The slit has an overall dimension of less than the dimension of grains.