Sealing device for rotary shaft

Abstract

The present invention provides a rotation axis sealing device which can prevent the abnormal deformation or partial abrasion of the sealing element for prolonging the service lifetime. A plate shaped supporting component (5) which supports a sealing element (3) at the low pressure side (6) is provided with a conical wall part (12) and internal circumferential end smooth wall part (13) with an orthogonal shaped axial center.

Description

technical field [0001] The present invention relates to a rotary shaft sealing device. Background technique [0002] Conventionally, a rotary shaft sealing device using a sealing element 31 made of PTFE or the like as shown in FIG. 6 is known. Alternatively, a rotary shaft sealing device using a sealing element as disclosed in Patent Document 1 is known. [0003] When the sealing fluid (including gas) is under high pressure or the surrounding area (especially the sliding surface 32 ) becomes high temperature and the strength of the sealing element 31 is lowered, there is a problem that abnormal wear of the curved portion 33 is largely locally generated. And, when the pressure P of the sealing fluid chamber 34 is high, because the strength of the sealing member 31 is not enough, the bent portion 33 (from the normal state of FIG. Excessive) deformation 40 is extruded from the gap portion 38 between the inner peripheral edge portion 36 of the plate-shaped support member 35 su...

AI Technical Summary

Problems solved by technology

[0009] Therefore, when a high pressure is applied, there is a problem of being squeezed out from the above-mentioned gap 42, and there is also a problem that the curved portion 33 is scratched by the sharp front end portion 43, thereby generating abrasion powder and shortening the life of the sealing device.

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