Paint drying furnace

Details Paint drying furnace Paint drying furnace

1997-08-08

1998-10-20

Walberg, Teresa J.

Heating

With means diluting, purifying or burning exhaust gases

432 59, F27D 1700

Patent

active

058237674

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to paint drying furnaces for baking and drying paint films on painted objects following a painting process, and more particularly to a paint drying furnace having furnace interior circulating gas passages for withdrawing furnace gases from furnace interiors and returning the withdrawn gas to the furnace interiors again, furnace interior heating means for heating, to a high temperature, the gases returned from the furnace interior circulating gas passages to the furnace interiors to heat the furnace interiors, hot gas heat source type radiator means with surfaces heated by passing a heat source hot gas through inner gas passages to radiate heat from the radiating surfaces to a furnace interior, a radiator circulating gas passage for returning a gas outputted from the inner gas passages of the radiator means, to the inner gas passages of the radiator means again, a combustion type radiator heating device mounted on the radiator circulating gas passage for heating the gas circulating through the radiator circulating gas passage, and a fresh air passage connected to a gas passage portion of said radiator circulating gas passage which transmits the gas outputted from the inner gas passages of the radiator means, to the combustion type radiator heating device, for mixing fresh air into the gas circulating through the radiator circulating gas passages, said combustion type radiator heating device being a direct heating type, combustion type heating device for burning a fuel directly in an atmosphere of the gas circulating through said radiator circulating gas passage.


BACKGROUND ART

Conventionally, as shown in FIG. 5, a paint drying furnace as noted above has, apart from a combustion type radiator heating device 19a mounted on a radiator circulating gas passage 20, and acting as furnace interior heating means Ha for heating, to a high temperature, gas RA' returned from a furnace interior circulating gas passage 9a to a furnace interiors 1a, a combustion type furnace interior heating device 19a' disposed on the furnace interior circulating gas passage 9a for heating gas RA circulating through the furnace interior circulating gas passage 9a by burning operation of a burner b.
For the radiator circulating gas passage 20 having gas PA circulating therein and containing no paint solvent vapor generated in the furnace interior during baking and drying treatment, the combustion type radiator heating device 19a mounted thereon comprises a direct heating type, combustion type heating device (i.e. the type for burning a fuel directly in the atmosphere of the circulating gas PA to be heated) which is advantageous in terms of thermal efficiency. On the other hand, for the furnace interior circulating gas passage 9a having gas RA circulating therein and containing paint solvent vapor generated in the furnace interior, the combustion type furnace interior heating device 19a' mounted thereon comprises an indirect heating type, combustion type heating device in which burning flames and combustion gas G produced by the burning operation of burner b and the gas RA circulating through the furnace interior circulating gas passage 9a to be heated exchange heat in a non-contact mode through an inner heat exchanger hx.
It has been necessary to employ, as the above combustion type furnace interior heating device 19a', an indirect heating type, combustion type heating device in which burning flames and combustion gas G, and the gas RA to be heated exchange heat in a non-contact mode, in order to avoid a situation in which the paint solvent vapor included in the gas RA circulating through the furnace interior circulating gas passage 9a is directly exposed and reacts to the burning flames in the combustion type heating device 19a', to produce a reaction product which lowers paint film quality (i.e. a reaction product which adheres to the paint films after return to the furnace interiors 1b, 1c to lower paint film quality).
In FIG. 5, 7 denotes radiator means for radiating heat to the furnace inter

REFERENCES:
patent: 4092100 (1978-05-01), Phillips
patent: 4164819 (1979-08-01), Devillard
patent: 4324545 (1982-04-01), Hubbert
patent: 4656758 (1987-04-01), Nakayama
patent: 4662840 (1987-05-01), Ellison
patent: 4670994 (1987-06-01), Takata et al.
patent: 4771707 (1988-09-01), Robson et al.
patent: 5568692 (1996-10-01), Crompton et al.
patent: 5588222 (1996-12-01), Thompson

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