Patent GB-858805-A (GB)
Title: Sealing ring for relatively rotating parts
IPC: F16J15/36
Filed: 1957-07-05
Abstract: 858,805. Stuffing-box substitutes. GUEYTRON, J. C. R. July 5, 1957, No. 21270/57. Class 122 (5). A sealing ring A<SP>1</SP> for a rotatable shaft 14 where it extends through a wall 16 comprises a rubber &c., collar 1 of U-section having enlargements 4, 5 at the ends of the arms of the U and reinforced by a brass or other rigid hoop 6 and a further collar 12 of self-lubricating material having a sealing face 13 to contact either the wall or the shaft, the collar 1 sealingly engaging either the shaft or the wall. The open end of the collar 1 is closed by a U -section fitting 7 fixed, as by spot-welding, to the hoop 6 and the collar 12, which is made of graphite or a mixture of graphite and a plastic or elastic sub-. stance e.g. rubber, is press-fitted or cemented into a groove 11 in the collar 1. In the arrangement shown in Fig. 2 for a compressor B<SP>1</SP>, the collar 1 is a press fit on the shaft 14 and the collar 12 is urged into sealing contact with the wall 16 by a shoulder 17 on the shaft pressing against the ring 6. Pressure of the sealed fluid entering the interior 9 of the collar 1 through holes 10 in the collar tends to expand it and increase the sealing pressures between the collar 12 and the wall and between the collar 1 and the shaft. In a modification, Fig. 5, the arms of the elastic collar 1c are radially disposed and the collar 12c is secured to the inner periphery of the collar 1c and arranged to engage the shaft 14c on its inner peripheral surface. The collar 1c is fitted in a rigid L-section ring 6c and the complete sealing-ring is held in a recess 21 in the shaft housing 22 by a split-ring 23. In another modification, Fig. 7, the outer enlargement 27 of the elastic collar 1d is reinforced by an L- section rigid ring 6d embedded therein and the interior 9d is closed by a disc 33 located in grooves in the enlargements 27, 28. The collar 1d is also reinforced by a metal disc 34 embedded in the material adjacent the collar 12d which is in facial sealing contact with a ring 36 of chrome-nickel steel or other wear-resistant material secured by vulcanization or cementing to a rubber ring 37 press-fitted in a recess 38 in the wall 16d. The collar 12d may be integral with the collar 1d and made self-lubricating by the addition of graphite &c. to the rubber. In yet another modification, Fig. 8, in which the sealing ring A<SP>5</SP> is held in a recess 39 in the wall 16e by a split-ring 40 and the self-lubricating collar 12e engages the shaft, one enlargement 27e of the elastic collar 1e is smaller than the other enlargement 28e and is reinforced by a ring 6e. The interior 9e is closed by a ring 33e which at one end is embedded in the enlargement 28e and has an offset portion at its other end interposed between the enlargement 27e and the recess 39. The collar 12e is integral with the collar 1e and may bear either directly on the shaft as shown or on a ring resiliently mounted on the shaft. In still another modification, Fig. 11 (not shown), the self-lubricating collar is urged in its direction of sealing by springs housed in the interior of the rubber collar and abutting the closure member therefor.