Dry-cleaning apparatus permitting use of ignitable or potentiall

Details Dry-cleaning apparatus permitting use of ignitable or potentiall Dry-cleaning apparatus permitting use of ignitable or potentiall

1993-10-28

1994-10-25

Coe, Philip R.

Textiles: fluid treating apparatus

Machines

Combined

34 77, 34 92, 34601, 34602, 68 20, 68209, D06F 4302, D06F 4308

Patent

active

053577710

ABSTRACT:
To permit the use of combustible and potentially explosive solvents used in dry-cleaning operations, based on hydrocarbon compounds, the dry-cleaning machine is formed with an explosion-resistant housing (8) surrounding a perforated, rotatable drum (1) into which the goods are introduced. After carrying out the normal dry-cleaning procedure, and draining of dry-cleaning solvent, a vacuum pump generates an under-pressure, in the order of below 500 mbar, and preferably about 230 mbar, while heating the mixture to effect drying. A cooling coil, located at a lower portion of the machine, provides for condensation of solvent out of the solvent-air mixture and, after the major portion of the solvent has been evaporated, the heat exchanger is switched over to cooling for final condensation of any remanent solvent. The vacuum continues to be maintained, so that the boiling point of solvent, due to the under-pressure, is lowered by at least 40.degree. C., and preferably 50.degree. C. or more, below the boiling point at ambient air pressure, so that explosions are reliably prevented and, if they should occur nevertheless, the explosive force is substantially decreased since the starting pressure of the explosive force is already substantially below atmospheric pressure.

REFERENCES:
patent: 1151417 (1915-08-01), Stokes
patent: 1740716 (1929-12-01), Traube
patent: 2074508 (1937-03-01), Hetzer
patent: 2310680 (1943-02-01), Dinley
patent: 2681512 (1954-06-01), Armstrong
patent: 3875686 (1975-04-01), Smoot
patent: 3937043 (1976-02-01), Hughes et al.
patent: 4665628 (1987-05-01), Clawson

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