UNIT OF SEALING FURNACE WORM SHAFT WITH GRANULAR MATERIALS Russian patent published in 2012 - IPC F27B7/24 

FIELD: metallurgy.

SUBSTANCE: unit of sealing furnace worm shaft with granular materials contains screw 1, sealing bushing 2, whereby in the sealing area the shaft is equipped with sleeve 4 made of a high strength material and it has spiral grooves 6 with a polished surface and slopes 7 with angles of over 10 degrees on outer surface 5 in order to avoid self-blocking in the grooves of the granular material. The said sealing bushing 2 has grooves 10 with polished surface on internal surface 9 that are made capable of rotating in the direction opposite to the one of the shaft and slopes 11 with angles excluding a possibility of material self-blocking in the grooves whereby the shaft rotating direction ensures squirting of granular material 8 back into furnace 12.

EFFECT: reliable sealing of the shaft in the furnace hot area is ensured and low maintenance cost.

1 dwg