Cleaning of workpieces having organic residues
AssigneeUnion Industrie Comprimierter Gase GmbH NFG. KG
InventorRobert Adler
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Abstract
The process concerns the cleaning of workpieces exhibiting organic residues, with the use of a fluid introduced under pressure into a pressure tank loaded with the workpieces. According to the invention, the fluid is circulated during the cleaning step, using preferably liquefied gases, e.g. carbon dioxde, as the fluid. By the use of a heat exchanger, the temperature of the fluid can be regulated during the process.
Claims30
In a process for cleaning workpieces exhibiting organic residues, comprising introducing compressed gas under pressure into a pressure tank loaded with the workpieces, the improvement wherein:
- a liquefied or supercritical gas having a temperature is mechanically circulated within the pressure tank during cleaning of the workpieces whereby the mechanically circulated liquefied or supercritical gas exhibits a circulation velocity and said circulation velocity of said liquefied or supercritical gas is varied during said cleaning, and
- wherein said temperature of said liquefied or supercritical gas in the pressure tank is maintained constant during said cleaning.
An apparatus for cleaning workpieces contaminated with organic residues said apparatus comprising:
- a first cylindrical pressure tank containing an impeller mounted on an axle within said first cylindrical pressure tank;
- said first cylindrical pressure tank is connected via conduits provided with valves with a second cylindrical pressure tank containing an impellar mounted on an axle within said second pressure tank;
- one of said conduits is provided with a pump, and a heat exchanger is positioned in this or another connecting conduit wherein said heat exchanger and said pump are connected with each pressure tank respectively by additional conduits;
- and that each pressure tank is connected by means of additional conduits with one or several storage tanks for compressed gases.
In a process for cleaning workpieces exhibiting organic residues, comprising introducing compressed gas under pressure into a pressure tank loaded with the workpieces, the improvement wherein:
- a liquefied or supercritical gas having a temperature is mechanically circulated within the pressure tank during cleaning of the workpieces whereby The mechanically circulated liquefied or supercritical gas exhibits a circulation velocity and said circulation velocity of said liquefied or supercritical gas is varied during said cleaning,
- wherein during said cleaning the temperature of the liquefied or supercritical gas is not varied stepwise to influence dissolving properties of said liquefied or supercritical gas.
Dependencies are inferred from the claim text.