Workpiece chilling and shrinking

Details Workpiece chilling and shrinking Workpiece chilling and shrinking

1990-06-14

1992-01-28

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62 502, 62374, 62380, F25D 1306

Patent

active

050834363

ABSTRACT:
An apparatus for chilling and shrinking workpieces being conveyed to a workstation on an assembly line comprises, a chilling chamber, a conveyer for transporting workpieces, at least one generally vertical conduit for transporting cryogenic liquid out of a bath to an outlet above the bath, wells for storing cryogenic fluid bath, baffles for slowing the counterflow of cryogenic vapor and a lid for maintaining vapor in the chilling chamber. The workpieces first go through the pre-cooling process where cryogenic vapor flows in a counterflow to chill the workpieces. The workpieces move through openings in the baffles, and after the pre-cooling process, the conveyer transports the workpieces to the cooling stage where baths of cryogenic liquid are stored in wells. Generally vertical conduits are immersed in the wells. The density of cryogenic fluid in the conduit is reduced by warm vapor, enabling the cryogen to flow up the conduit. Cryogen reaching the outlet above the bath is sprayed onto workpieces transported by the conveyer. Cryogenic vapor resulted from the spraying flows to the pre-cooling section where it forms the counterflow discussed above.

REFERENCES:
patent: 3405531 (1968-10-01), Davis, Jr. et al.
patent: 3455120 (1969-07-01), Schlemmer
patent: 3485055 (1969-12-01), Webster et al.
patent: 3879954 (1975-04-01), Cann
patent: 4637216 (1987-01-01), Shenoy et al.

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