UA35430A - End gasket - Google Patents

Abstract

The invention relates to sealing units of rotary shafts of pumps, machines and apparatuses of chemical, oil-processing and other fields of industry. The end gasket has shaft, rotary and non-rotary tightening rings.

Description

The invention relates to sealing devices for rotating shafts of pumps, machines and devices of chemical, oil refining and other industries.

There is a known end seal (AS USSR Mo2028525), which is the closest in its technical essence to the proposed one, which contains a body, a shaft, rotating and non-rotating sealing rings that are in contact with each other on a flat friction surface, and on the friction surface of the rotating ring, an annular a groove of a rectangular profile, which on the side of the base is connected by axial channels with conical radially placed cavities, which are connected to a compacted cavity, from which they are separated by balls by means of leaf springs fixed on the outer surface of a rotating sealing ring.

The main disadvantage of the known end seal is that the movement of the compacted liquid along the axial channels is complicated due to the adhesion of the compacted liquid to the walls of the channel under the action of centrifugal force.

The task of the invention is to increase the reliability of the end seal and reduce the loss of the compacted liquid.

The technical result is achieved by the fact that the annular groove is made in the form of a rectangular trapezoid, the outer side of which is inclined at an angle a to the axis of rotation of the ring and is directed from the axis of rotation in the direction of movement of the compressed liquid. The angle E is taken from the condition that the axial force. which moves the compacted liquid, was greater than the friction force of the compacted liquid on the wall of the annular groove.

Fig. 1 shows the end seal, general view: Fig. 2 - view B in Fig. 1.

The end seal consists of a fixed friction ring 1, which is installed in the housing 2, sealed by secondary seals C and 4 and fixed with pins 5, a movable friction ring 6, on the end surface of which there is an annular groove in the form of a rectangular trapezoid 7, the outer side of which is inclined under angle U to the axis of rotation of the ring, which is installed in the bushing 8 and sealed by secondary seals 9 and 10. In the bushing 8, conical radially located cavities 11 are made, which are connected by longitudinal channels 12 with the annular groove 7, and are closed by balls 13 with the help of plate springs 14. The sleeve 8 is connected to the shaft 15 by a key 18 and is sealed by a secondary seal 17. The stationary friction ring 1 is pressed against the movable ring 6 by a pressure element 18 through a spring 19.

Sealing works as follows.

When the shaft 15 is stopped, the sealing of the seal is carried out by the junction of the friction rings 1 and 6 due to their pressing by the pressure element 18 through the spring 19, and the conical radially placed cavities 11 are closed by balls 13 with the help of plate springs 14. When the shaft 16 rotates, the sleeve 8 with the friction ring 6 rotates The compressed liquid tries to penetrate through the junction of the friction rings 1 and 6 to the outside and enters the ring groove 7, which is made in the form of a rectangular trapezoid, the outer side of which is inclined at an angle 9 to the axis of rotation of the ring b. Under the action of the centrifugal force, the compacted liquid is pressed against the outer side of the groove 7, and due to the angle of inclination of its outer side, an axial force arises in the liquid, under the action of which the compacted liquid moves to the conjugate channels 12. through which it enters the radially located cavities 11. Under the action of the centrifugal force force, the compacted liquid presses on the balls 13, overcoming the elasticity of the springs 14 and through the created gap is ejected back into the compacted cavity. When the centrifugal force is reduced under the action of the elastic force of the springs 14, the balls 13 tightly close the conical radially located cavities 11. This blocks the back penetration of the compacted liquid through the conical radially located cavities 11 and the longitudinal channels 12 into the annular groove 7 and beyond.

Thus, the proposed design of the end seal promotes the movement of the compacted liquid from the annular groove back to the compacted cavity and excludes the possibility of the compacted liquid penetrating to the outside. 18 5. Z B 9 14 13 t: she dra n them and IH DU Ex 1 ; in Boshchi; ) y MI tt Y E o RE "rom

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Claims (1)

An end seal containing a body, a shaft, rotating and non-rotating sealing rings, which are in contact with each other along a flat friction surface, and the friction surface of the rotating ring has an annular groove with a rectangular profile, which is connected on the side of the base by axial channels with conical radially placed cavities, which are connected to a compacted cavity, from which they are separated by balls by means of plate springs fixed on the outer surface of the rotating sealing ring, differs in that the annular groove is made in the form of a rectangular trapezoid, the outer side of which is inclined at an angle a to the axis of rotation of the ring and is directed from axis of rotation in the direction of movement of the compacted liquid, the angle i is taken from the condition that the axial force that moves the compacted liquid is greater than the friction force of the compacted liquid on the wall of the annular groove.