Dry Ice Blasting Conditioning Unit for Sensitive Surface Cleaning
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Solution Overview
Problem
Conventional dry ice blasting systems are limited in their application due to abrasive effects on sensitive surfaces and inability to treat textiles, open-pored objects, and certain materials like nickel, chrome, and ceramics, as they rely on high kinetic energy that can damage these surfaces.
Innovation Solution
A device with a conditioning unit that adjusts the dry ice particle-compressed air mixture to reduce kinetic energy and sublimation distance, allowing for a non-abrasive and gentle treatment by controlling the sublimation effect, particle size, and jet pressure, enabling safe cleaning of sensitive surfaces without damaging them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dry ice particles are accelerated to high speed (approximately 300 meters per second) for effective contaminant removal, then cleaning efficiency is improved, but abrasive damage to sensitive surfaces occurs
Solution Approach 1:
The patent applies parameter changes by controlling the sublimation distance of dry ice particles before they reach the surface. By adjusting parameters such as particle size, compressed air pressure, and nozzle-to-surface distance, the dry ice particles partially or completely sublimate before impact, transforming from a high-kinetic-energy state that causes abrasion to a controlled sublimation process that maintains cleaning effectiveness while reducing surface damage.
Solution Approach 2:
The patent utilizes phase transitions by allowing dry ice particles to sublimate (transition from solid to gas) at a controlled distance from the target surface. This phase transition reduces the kinetic energy of particles before they reach sensitive surfaces, eliminating abrasive damage while maintaining the cleaning effect through the sublimation process itself and the resulting gas expansion that lifts contaminants.
2Productivity
If conventional dry ice blasting is used on sensitive surfaces, then contaminant removal is achieved, but the surfaces such as nickel, chrome, and ceramics are damaged
Solution Approach 1:
The patent applies preliminary action by causing dry ice particles to partially or completely sublime before they reach the surface. This pre-sublimation process prepares the particles in a way that eliminates their harmful kinetic energy while preserving their cleaning capability, allowing contaminant removal without compromising the strength and integrity of sensitive surfaces.
Solution Approach 2:
The patent uses the sublimation process as an intermediary mechanism between the dry ice particles and the surface. By introducing this intermediate phase transition step at a controlled distance from the target, the harmful direct impact is meditated through the sublimation process, which transforms the interaction from a damaging mechanical impact to a gentler thermal and expansive cleaning action.
3Power
If high kinetic energy dry ice particles are used, then cleaning power is increased, but the method cannot be applied to textiles, open-pored objects, and delicate materials
Solution Approach 1:
The patent applies dynamics by making the dry ice particle stream dynamically adjustable through controlled sublimation. By varying parameters such as particle size, compressed air pressure, and sublimation distance, the system can adapt its cleaning power in real-time, enabling the same system to effectively clean a wide range of materials from robust surfaces to delicate textiles and open-pored objects without causing damage.
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 allows for the safe and effective cleaning of previously inaccessible surfaces by reducing wear and thermal load, enabling the use of dry ice blasting on materials like nickel, chrome, soft aluminum, and ceramics without damaging them, while maintaining the sublimation effect for efficient contaminant removal.
Implementation Method 1
the dry ice particles transform into a gaseous state, or sublimate, the moment they hit the surface to be cleaned
Implementation Method 2
Dry ice particles, such as dry ice pellets, are accelerated by compressed air to a speed of approximately 300 meters per second
Implementation Method 3
the low temperature of the dry ice particles makes the coating brittle, leading to cracking and contributing to its detachment
Implementation Method 4
the dry ice penetrates the coating and instantly evaporates, causing it to expand approximately 700 to 1,000 times in volume
Data Source
Figure 1a~1c
Figure 2
AI summary
The invention relates to a device (1) for dry ice treatment of surfaces (12), wherein the device (1) comprises a dry ice source (2) for providing dry ice, a mixing unit (3), a compressed air source (4) fluidically connected to the mixing unit (3), and a conditioning unit (5) fluidically connected to the mixing unit (3) for adapting a dry ice particle-compressed air mixture (11) provided by the mixing unit (3) to application-specific conditions. The conditioning unit (5) is configured to condition the dry ice particle-compressed air mixture (11) such that a predetermined or definable proportion of the dry ice particles in the dry ice particle-compressed air mixture (11) completely sublimates at a predetermined or definable distance in front of the surface (12) to be treated.