Chilling assembly line workpieces by cryogen counterflow

Details Chilling assembly line workpieces by cryogen counterflow Chilling assembly line workpieces by cryogen counterflow

1988-07-20

1989-11-07

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62373, 62 511, F25D 1306

Patent

active

048783544

ABSTRACT:
Workpieces (e.g. valve seats, valve guides, or cylinder liners for an internal combustion engine) are chilled as they are supplied to a station on an assembly line, using a feeder/chiller that includes a passage to convey workpieces downwardly from a location at the top of the passage to an assembly line station. The chiller/feeder is fed cryogen from a reservoir of liquid cryogen. Because cryogen fluid (chilled nitrogen vapor) entering the passage is denser than air, downward flow of cryogen fluid must be restricted. For example, the passage includes a constriction below the position at which cryogen is fed to the passage. The constriction is configured and sized to allow workpieces to move through the constriction, yet the constriction is small enough to restrict the downward flow of cryogenic fluid when a workpiece is positioned in the constriction. Above the constriction, the cooling passage is large enough to allow sufficient clearance around workpieces to permit an upward flow of cryogenic fluid. The cryogenic fluid flows up the passage, counter to the movement of workpieces down the passage.

REFERENCES:
patent: 1955728 (1934-04-01), Allen et al.
patent: 1980156 (1934-11-01), Emrick
patent: 2218722 (1940-10-01), Ross
patent: 2487821 (1949-11-01), McCandless et al.
patent: 3025680 (1962-03-01), De Brosse et al.
patent: 3621550 (1971-11-01), Colestock
patent: 3972202 (1976-08-01), Stearns
patent: 4715187 (1987-12-01), Stearns

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