SU401848A1 - RADIAL MECHANICAL SEAL OF ROTATING SHAFT - Google Patents

Description

The invention relates to contact seals used in mechanical engineering for limiting fluid leakage along a rotating shaft.

A radial-face seal of a rotating shaft is known by means of metal clips inserted into the body, IB of which are continuous rings made of antifriction material with an internal oval-shaped boring, fixed from rotation by clamps and pressed to the shaft in diametrically opposite directions covering them along the semicircle springs.

Izvestnos seal is not enough reliability because of the complexity of the design, it has two wells and small details like stoppers. In addition, this seal limits the maximum number of revolutions of the shaft to the relative speed of slip of the rings on the shaft.

The aim of the invention is to simplify the construction, 1) reduce the reliability of the seal and increase the maximum allowable number of shaft revolutions due to the redistribution of the slip speed between the face and radial friction surfaces.

For this ring, the proposed seals are not fixed, they can rotate against the shaft, they are pressed against it by one ring spring, which moves from one ring to another, each covering an arc equal to half the circumference, and the oval-shaped internal boring of each

the ring is offset from the outer surface away from the spring enclosing the ring.

FIG. 1 depicts the described seal, the general view; in fig. 2 - section along AA

pas figs. one; in fig. 3 is a view along arrow 5 in FIG. 2

The seal contains a sleeve 2 inserted into the housing 1, the sealing rings 3 and 4, which are pressed to the shaft 5 by an annular (bracelet) spring 6. The assembly is closed by a protective jaw 7 and a split spring ring 8. The sealing rings 5 and 4, made of an anti-friction material, have an internal oval boring {and

The ring gauge is offset from the center of the shaft) and the system of discharge grooves for hydraulic unloading in the axial and radial directions. The end surfaces of the rings 3 and 4 and the thrust collar 2

lapped and pressed to each other by pressure forces of the medium to be compressed. Bracelet spring 6 covers each of the sealing rings 3 and 4 along the semicircle and passes from one ring to another along transition grooves cut at an angle to

ploakosti connector rings. Under the action of the spring 6, the sealing rings 3 and 4 are displaced one relative to the other in diametrically opposite directions and without a gap cover the shaft along the surface of two semirings. The strength of the friction between the bracelet spring and the rings prevents triple rotation of one Ring relative to another.

When the shaft 5 rotates, the sealing rings 5 and come into rotation due to the fact that the moment of frictional forces between the shaft and the rings exceeds the moment of forces of three types with the end surface of the ring 4 and the yoke 2. When the number of shaft revolutions increases to the specified value, the centrifugal forces acting in in the direction opposite to the action of the ring, as a result of the displacement of the center of gravity of the ring relative to the axis of rotation, reduce the force of the ring to the shaft and, accordingly, reduce the moment of friction force along the radial surface and. With equal moments of friction forces on the radial and face surfaces of the sealing rings, the rings begin to rotate relative to the shaft, and as the number of revolutions increases, the speed

The slip is distributed between the face and radial friction surfaces.

Subject invention

Radial-face seal of the rotating shaft with the help of built-in holders in the casing, each of which has made of antifriction material

two continuous rings with an oval-shaped bore, pressed against the shaft in a diametrically opposite direction with a spring covering each ring in an arc equal to half a circle, characterized in that

with the aim of simplifying coping, increasing the reliability and the maximum permissible shaft rotation speed due to the redistribution of the slip speed between the face and radial friction surfaces, the ring is not

fixed against rotation, pressed against the shaft of one transition from one ring to another AND covering them in an arc equal to half a circle-, spring, and the internal boring of each ring is oval-shaped

offset from the outer surface away from the spring enclosing the ring.

FIG.

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FIG. 3