PACKING UNIT OF ROTOR TUNNEL SHIELD Russian patent published in 2003 - IPC

FIELD: underground construction, tunnel construction. SUBSTANCE: packing unit of rotor tunnel shield includes central pack-off sealing located between rotor and immobile shaft anchored in central part of partition of shield frame and peripheral sealing. Central pack-off sealing comes in the form of profiled V-shaped rings with diverging outer protrusions which are placed in grooves of immobile shaft or rotor for elastic interaction of protrusions with immobile shaft and rotor. Peripheral sealing is located between rotor and partition of shield frame and is made of rows of profiled rings comprising two elements, as minimum. One element has latch positioned in groove of rotor or partition of shield frame which carries wedge-shaped inclined projection interacting with sealed surface. The other element is fixing element that has form of V-shaped profile with diverging outer protrusions and is mounted for elastic interaction of protrusions with walls of first elements and for fixing sectional profiled ring in groove. EFFECT: enhanced operational reliability, improved unification of elements of packing unit. 6 dwg