SHAFT-TYPE RESISTANCE FURNACE FOR THERMAL TREATMENT OF HIGHLY-PRECISE AND THIN-WALLED DETAILS Russian patent published in 2008 - IPC F27B1/00 

FIELD: heating.

SUBSTANCE: invention relates to shaft-type resistance furnace. Shaft-type resistance furnace for thermal treatment consists of casing, lining, muffler with open low part, heaters, lid, pipes for muffler access to working chamber and shielding gas outlet, tank with operating medium to cool items heated in muffler. Tank with operating medium is surrounded by water jacket and leak-tightly connected to low part of muffler via adapter by means of in-cut connection. Adapter is provided with choke. Cable thermoelectric converters are located on working coil of spring, which is displaced on support bar with clearance and fixed to support base by its low end. Support base is rigidly fixed to cooling tank bottom. Top end of spring is fixed to base under rack for heat-treatable items. Entrapping element contacting with support bar is fixed to the same base. There is an opening in bottom for working terminals of cable thermoelectric converters. Their length is selected against the height of heat treatable items position. Free ends of thermoelectric converters are intended for connection to measuring device and drawn outside through the opening in support base and leak-tight inlet installed inside cooling tank.

EFFECT: stable geometric dimensions of heated in furnace items and keeping of preset degree of mechanical properties.

2 dwg