Emergency shaft seal device by deformation of packing ring
AssigneeNipon Pillar Packing Co.. Ltd.
InventorsTakahisa Ogawa, Hirofumi Aritsubo
Life of this patent
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Abstract
This invention discloses an emergency shaft seal device wherein a packing ring of elastic material the inside diameter of which is larger than the outside diameter of a rotatable shaft is received in an annular groove along the periphery of the rotatable shaft to be free and not in contact with the rotatable shaft, and in the event of abnormal condition of a main shaft seal device used under the normal conditions, the packing ring is deformed by the pressure of a pressurized fluid applied to the outer periphery of the packing ring to be equally pressed to the periphery of the rotatable shaft so that the sealing is performed by the packing ring in place of main shaft seal.
Claims14
An emergency shaft seal device arranged in association with a main shaft seal device about a rotatable shaft, comprising:
- a seal housing having an inner periphery wherein an annular receiving groove is formed on the inner periphery along the periphery of the rotatable shaft;
- a packing ring of rubber material the inside diameter of which is larger than the outside diameter of the rotatable shaft and which is received in the receiving groove of the seal housing in such a manner as to be free and not in contact with rotatable shaft;
- and
- pressing means provided on the side of the seal housing and by which the packing ring is pressed and deformed by a pressurized fluid so as to be tightly pressed against the periphery of the rotatable shaft.
Dependencies are inferred from the claim text.