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US 5,216,890 AGranted
Device for and method of producing hyperfine frozen particles
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsCozy Ban, Itaru Kanno, Takaaki Fukumoto
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Abstract
A device for and a method of producing hyperfine frozen particles reduces the quantity of impurity particles in the hyperfine frozen particles produced and stabilizes the generation of hyperfine frozen particles. A hopper includes a heat exchanger through which a coolant, such as nitrogen gas or liquid nitrogen, is circulated. A nitrogen gas inlet through which low temperature nitrogen gas as a coolant is supplied includes a filter to produce a laminar flow of the gas.
Claims10
A device for producing hyperfine frozen particles comprising:
- a hopper having a wall defining an interior of said hopper, an inlet end, and an outlet end;
- a heat exchanger for cooling said wall and the interior of said hopper;
- a nozzle for spraying pure water into said hopper at the inlet end;
- and means for introducing a laminar flow of coolant gas into the inlet end of said hopper.
1 more element
A method of producing hyperfine frozen particles comprising:
- circulating a coolant through a heat exchanger provided on a wall of a hopper to cool the wall to a temperature substantially equal to the temperature within said hopper;
- spraying pure water into said hopper from an inlet end;
- introducing a coolant gas into said hopper from the inlet end through a filter in a laminar flow;
- and
- converting the pure water into hyperfine frozen particles by freezing the water with the coolant gas.
2 more elements
Dependencies are inferred from the claim text.