SU1451415A1 - Seal for rotating shaft - Google Patents

Abstract

The invention relates to a sealing technique, in particular, to the structures of floating seals of rotating shafts, and can be used in pump engineering and compressor growth. The purpose of the invention is to increase reliability due to the possibility of tracking the radial shaft oscillations 1 and the self-adjustability of the confusion dimension of the radial clearance between the shaft and the floating ring. The seal comprises a housing filled with a locking fluid, outer and inner floating rings installed with a clearance relative to the shaft, and means for face sealing and damping, which is made in the form of an additional ring fitted with a sealing and damping / shoulders mounted in the annular chamber, in the end of the outer ring. During the operation of the sealing unit, the outer floating ring, deformed under the pressure of the working medium, provides self-regulation of the confusion of the radial gap, while the additional ring is pressed against the body, ensuring the tightness of the joint. Hydraulically: discharged axially, the oversized floating ring tracks the radial movements of the shaft, and the additional ring dampens its radial high-frequency vibrations. 2 hp f-ly, 2 ill. (L

Description

The invention relates to a sealing technique, in particular, to the structures of floating seals of rotating shafts, and can be used in pump construction and compressor design.

The purpose of the invention is to increase reliability.

FIG. I depicts the proposed seal J in FIG. 2 — seals with an additional ring having an external spherical and internal conical surface.

The seal comprises a housing 1 filled with a barrier liquid, an external 2 and. inner 3 floating rings mounted with a gap 4 relative to shaft 5, means for face sealing and damping j which is provided in the form of an additional ring 8j provided in the end chamber 9 provided in sealing ring 6 and in damper arm 7 outer ring 2, Additional ring 8 can be mated with the outer ring 2 on toroidal 1 O surfaces located in the center of mass i of the outer 2 and an additional 8 rings, and on the outer surface of the latter A groove 12 with a sealing ring 13 installed therein. An additional ring 8 can be made with a spherical i 4 and a conical 15 inner surfaces, conjugated respectively with the inner cylinder 1 of the chamber 9 and the spherical surface 17 of the end portion of the outer ring 2, and on the end surface of the additional ring there is an annular groove 18 with a sealing ring 19 installed therein,

The rotary vakhsh seal works as follows.

When the machine is operating under the effect of pressure drop on the seal, the floating ring 3 due to hydroscopic forces builds up and occupies a position relative to the shaft 55 close to concentric. Under the action of the pressure forces of the working medium, the inflatable floating ring 2 is deformed and thus self-regulation of the degree of confusion of the radial gap is automatically ensured.

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between the shaft 5 and the floating ring 2. In this case, the additional ring 8 is clamped to the housing 1 with flanges, thus ensuring the tightness of the joint, and the sealing ring 13 seals the joint between the two rings 2 and 8 as the shaft 5 rotates.

JQ, the axially unloaded outer ring 2, due to the insignificant friction force in the toroidal connection of surfaces 7 and 9, freely tracks the radial pe1. The shaft shaft 5, the additional ring 8, damps its radial high-frequency oscillations. Execution of an additional ring B with a spherical 4 and a conic 15 on top of Q no. They even more closely align the centering ability of the seal and allow the self-assembly of the additional ring 8 in the annular chamber, depending on the pressure differential, acting on the ring. In this case, an additional ring 8 is acted upon by a moment of force, which presses the sealing shoulder 6 to the end wall of the housing 1, the spherical surface 14

2Q to the inner cylindrical surface 16 of chamber 9 and compresses the sealing ring 19, which prevents leakage of the densified medium at the junction points of both rings.

 five

With this support surface

the application of the moment of forces is the spherical surface 17 of the face section of the outer ring 2.

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Thus, the proposed rotary shaft seal has a higher reliability due to the ability to track

, ij radial oscillations of the shaft and self-regulation of the size of the confusion of the radial gap between the rotating shaft and the floating ring. Moreover, such an implementation of the seal design 5 makes it possible to reduce the guaranteed gap between the floating ring and the shaft while maintaining the reliability of the seal operation and thereby increasing the sealing ability of the sealing assembly. Self-regulation of the size of the gap allows to reduce the wear of the floating ring elements and, accordingly, to increase the life of the seal.

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55

Claims (3)

Invention Formula I. Sealing of a rotating shaft, comprising a housing filled with locking greed, outer and inner rings of the ring, installed with a gap relative to the shaft, means for mechanical sealing and damping, characterized in that, in order to increase reliability, means for mechanical sealing and damping in a wave - but in the form of an additional ring fitted with a sealing and damping shoulders, mounted in a ring chamber made in the end part of the outer ring, 2. The seal according to claim 1, which is based on the fact that the additional ring is associated with the narztasnym ring on the toroidal surfaces, 1451415 located in the center of mass of the outer and additional rings, on the outer surface of the latter there is an annular groove with a sealing ring installed in it. 3. Compaction according to claim I, about tl and - the fact that the additional ring is made with a spherical outer and conical inner surfaces, mated respectively with the inner cylindrical surface of the chamber and the spherical surface of the end portion of the outer ring rings are provided with an annular groove with a sealing ring installed in it. f 9 2 ran G6 18.1 a