Hot Isostatic Pressing Cooling via Passive Gas Mixing
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Solution Overview
Problem
Existing hot isostatic pressing methods for cooling loads in furnace chambers often result in uneven cooling, leading to quality issues and potential crack formation, and require complex mixing devices and limited inlet areas, which are costly and inefficient, especially when heating elements are not present on the sides of the furnace.
Innovation Solution
A method utilizing passive mixing by self-convection, where a cooler pressure medium mixes with a hotter medium without special devices, allowing the pressure medium to fall through the hotter medium, creating a mixed medium that is reintroduced to the load compartment, effectively reducing temperature evenly across the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If cold gas is injected directly into the loading space for rapid cooling, then cooling speed is improved, but cooling uniformity deteriorates causing uneven quality and crack formation
Solution Approach 1:
The patent introduces a mixing chamber as an intermediary component between the cold gas source and the loading space. Cold gas is mixed with hot gas from the furnace chamber in this intermediary chamber, creating a temperature-modulated mixed gas that is then introduced into the loading space. This mediator approach prevents direct injection of extremely cold gas while still achieving rapid cooling, resolving the contradiction between cooling speed and uniformity
Solution Approach 2:
The patent changes the temperature parameter of the cooling gas by mixing cold gas with hot gas from the furnace chamber. The mixed gas has an intermediate temperature that is lower than the original hot gas but higher than the cold gas, allowing for controlled cooling rate and uniform heat distribution throughout the loading space, thus achieving both rapid cooling and uniformity
2Stability of the object's composition
If a small inlet area is used for mixed gas as in prior art, then mixing effectiveness is improved, but heating uniformity deteriorates when heating elements are only at the bottom
Solution Approach 1:
The patent segments the gas distribution system by providing multiple inlet openings distributed across the front wall of the furnace chamber rather than a single small inlet. This segmentation allows mixed gas to be introduced at multiple locations simultaneously, improving both mixing effectiveness and heating uniformity throughout the loading space without requiring side heating elements
3Stability of the object's composition
If complex mixing devices such as ejectors with throttling are used, then mixing effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs natural convection and buoyancy forces to achieve gas mixing without requiring complex mechanical mixing devices. The temperature difference between cold and hot gas creates natural flow patterns that facilitate mixing in the mixing chamber, eliminating the need for ejectors, throttling mechanisms, or other complex active mixing components
Solution Approach 2:
The patent replaces mechanical mixing systems (ejectors, pumps, fans) with thermal convection-based mixing. The temperature gradient drives natural convection currents that mix the cold and hot gases passively, substituting a mechanical system with a thermal field-based system that is simpler and more reliable
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 approach achieves even cooling without the need for complex mixing devices, reduces maintenance and operating costs, and allows for larger inlet areas, enabling efficient cooling and heating with heating elements only at the bottom of the furnace.
Implementation Method 1
a passive mixing may be used, in which the cool pressure medium, unaided or unforced, mixes with the hot pressure medium. The thus mixed pressure medium is introduced into the furnace chamber. This means that the actual mixing process is achieved by the movements of differently tempered pressure media, i.e. by self-convection.
Implementation Method 2
The cool pressure medium is delivered to a level in the furnace chamber corresponding to half the height of the load compartment and is allowed to fall through the released hot pressure medium to a level corresponding to the bottom of the load compartment.
Implementation Method 3
The cool pressure medium is delivered to a level in the furnace chamber corresponding to half the height of the load compartment and is allowed to fall through the released hot pressure medium
Data Source
AI summary
A method of cooling a load provided in a load compartment in a furnace chamber of a furnace of a hot isostatic pressing device includes releasing hot pressure medium from the load compartment. Cool pressure medium is provided for enabling it to fall through the released hot pressure medium outside the load compartment. The thus obtained mixed pressure medium is led into the load compartment. A hot isostatic pressing device includes a load compartment having an aperture near an upper portion thereof configured to vent warm pressure medium into a region surrounding the compartment, and a conduit configured to introduce cool pressure medium into the region surrounding the compartment for mixing with the warm medium. The compartment also includes an aperture near a lower portion thereof configured to receive a mix of warm and cool pressure medium from the region surrounding the compartment.