Hydrostatic bearing type seal for a controlled deflection roll

Abstract

Abstract A CONTROLLED DEFLECTION ROLL HAS A NON-ROTATIVE SHAFT AND A SUPERIMPOSED ROLL SHELL WITH RADIAL SPACE BETWEEN THE TWO. END AND AXIALLY EXTENDING SEALS ARE CONNECTED TO THE SHAFT AND BEAR AGAINST THE INSIDE OF THE ROLL SHELL TO DIVIDE THE SPACE INTO TWO COMPARTMENTS, INTO ONE OF WHICH LIQUID IS INTRODUCED UNDER PRESSURE SO THAT WHEN THE ROLL SHELL IS WORKING AGAINST A COUNTER ROLL UNDER PRESSURE, THE DEFLECTION OF THE ROLL SHELL IS CONTROLLED BY THE PRESSURE ON THE LIQUID WITH CONSEQUENT OPPOSITE BEAM DEFLECTION OF THE SHAFT. ONE OR MORE OF THESE SEALS, AND PREFERABLY ALL OF THEM, IS FORMED BY A PISTON WHICH RECIPROCATES IN A RECESS IN THE SHAFT TO AND FROM THE INSIDE OF THE ROLL, THIS PISTON HAVING AN OUTER SURFACE FACING THIS INSIDE AND IN WHICH A RECESS IS FORMED TO FORM A HYDROSTATIC BEARING PAD COOPERATING WITH THE INSIDE OF THE ROLL, THIS INSIDE FORMING WHAT IS IN EFFECT A HYDROSTATIC BEARING RUNNER. THERE IS A FLUID CONNECTION BETWEEN THIS RECESS AND THE BACK OF THE PISTON AND A SOURCE OF FLUID UNDER PRESSURE IS CONNECTED TO THE RECESS THROUGH A FLOW RESTRICTOR SO THAT THE PISTON FORMS A SEAL ACTING LIKE A HYDROSTATIC BEARING. THE SOURCE OF SEALING PRESSURE MAY BE SEPARATE FROM THAT SUPPLYING THE ROLL DEFLECTION PRESSURE, EITHER IN THE SENSE OF BEING LITERALLY A SEPARATE SOURCE OR A SOURCE WORKING THROUGH A PRESSURE CONTROLLING SYSTEM, WHEREBY THE SEALING PRESSURE MAY BE VARIED INDEPENDENTLY OF THE ROLL DEFLECTION CONTROLLING PRESSURE.

Inventors

• 👤 Samuel S Board Jr
• 👤 George R Cournoyer
• 👤 Peter Hold

Bibliographic Details