CONVECTION DRYING DEVICE AND METHOD OF COATING HARDENING (VERSIONS) Russian patent published in 2012 - IPC F26B9/06 F26B3/04 

FIELD: machine building.

SUBSTANCE: in particular, this invention relates to a convection drying device of simplified design to harden coatings applied onto an item. The invention also relates to versions of the method to harden a coating applied onto an item placed inside a drying chamber casing. According to the first version, a drying device comprises a casing (32) of a drying chamber with a conveyor passing through it to move an item via the drying chamber, a fan to supply compressed air into the casing (32) of the drying chamber, an air duct comprising the first element protruding into the casing (32) of the drying chamber, and the second element connected to the fan for compressed air supply from the fan into the casing (32) of the drying chamber, a burner arranged substantially between the first and the second elements to heat compressed air. Besides, the first element is made with many air outlet holes distributed along the casing (32) of the drying chamber to direct the heated air to the item. According to the invention, the fan is made as capable to supply air to the casing (32) of the drying chamber in the volume of less than 25 stand. cub. feet/min, per foot of the drying chamber casing length (139 norm. m³/hr per metre of the drying chamber casing length). According to the second version, a drying device to harden a coating applied onto an item moved through a drying chamber comprises a casing (32) of a drying chamber with a conveyor passing through it to move an item via the drying chamber, a fan to supply compressed air into the casing (32) of the drying chamber, an air duct comprising the first element protruding into the casing (32) of the drying chamber, and the second element connected to the fan for compressed air supply from the fan into the casing (32) of the drying chamber, a burner arranged substantially between the first and the second elements to heat compressed air, besides, the first element is made with many air outlet holes distributed along the casing (32) of the drying chamber to direct the heated air to the item. According to the invention, distribution of the heated compressed air via air outlet holes is carried out with the ratio of air flow speed to the volume flow of air making approximately from 150 to 650 feet^-2 (approximately from 1584 to 6950 m^-2). According to the first version, the method to harden a coating applied onto an item placed inside the drying chamber casing includes supplying compressed air to the casing (32) of the drying chamber, heating of the compressed air near the casing (32) of the drying chamber to produce heated compressed air and distribution of the heated compressed air in the inner space of the casing (32) of the drying chamber in points distanced from each other via air outlet holes. Besides, supply of compressed air to the casing (32) of the drying chamber is carried out in the volume of less than approximately 25 stand. cub. feet/min, per foot of the drying chamber casing length (139 norm. m³/hr per metre of the drying chamber casing length). According to the second version, the method to harden a coating applied onto an item placed inside the drying chamber casing includes supplying compressed air to the casing (32) of the drying chamber, heating of the compressed air near the casing (32) of the drying chamber to produce heated compressed air and distribution of the heated compressed air in the inner space of the casing (32) of the drying chamber in points distanced from each other via air outlet holes. Besides, distribution of the heated compressed air in the inner space of the casing (32) of the drying chamber in points distanced from each other is carried out with the ratio of air flow speed to the volume flow of air making approximately from 150 to 650 feet^-2 (approximately from 1584 to 6950 m^-2).

EFFECT: reduced power inputs.

36 cl, 7 dwg