Packing gland seal assembly as an upstream seal for mixer rotors

摘要

In the field of helical bladed rotors, and their sealing assemblies an improved upstream seal for mixer rotors is provided. It includes a bushing-like visco sleeve subassembly, a sleeve shaped metallic liner positioned abutting the visco sleeve; a sleeve-like, visco seal having first and second peripheries, an L-shaped packing seat retainer, all configured to provide a single annular shaped inner chamber in which a single, rope-like packing component serves to minimize hardening of the packing assembly by minimizing feed particulate material leaking into the upstream visco seal.