UA75445C2 - End gasket - Google Patents

Abstract

The invention relates to tightening units of rotary shafts of pumps, machines and apparatuses of chemical, oil-processing and other fields of industry. An end gasket has a body, a shaft, rotary and non-rotary gasket rings, a circular groove with trapeze-like profile. At the outer side surface of the trapeze-like circular ring faced is made, this forms wedge-like circular cavity to which under action of centrifugal force compressed liquid goes and forms hydraulic lock decreasing liquid flow.

Description

Description of the invention

The invention relates to sealing devices for rotating shafts of pumps, machines and devices of chemical, 2 oil refining and other industries.

The known end seal (SHA Mo35430A, KO patent Mo2145020) is the closest in its technical essence to the proposed one, which contains a body, a shaft, rotating and non-rotating sealing rings that contact each other along a flat friction surface, and on the friction surface of the rotating ring, an annular a groove of a trapezoidal profile, which, on the side of the base, is connected by axial channels with conical 70 radially placed cavities, which are connected to a sealed 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 the inability to remove an increased amount of compacted liquid due to the fact 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. 12 The task of the invention is to reduce the amount of compacted liquid that enters the annular groove.

The technical result is achieved by the fact that a chamfer is made on the outer side of the trapezoidal annular groove, which forms a wedge-shaped annular cavity, into which, under the action of the ventral force, the compacted liquid enters and forms a hydraulic lock, which reduces the flow of liquid.

Figure 1 shows the end seal, general view; in Fig. 2 - view B in Fig. 1; in Fig. 3 - view B in Fig. 2.

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 a to the axis of rotation of the ring and a chamfer 8 is made on it, which forms a wedge-shaped ring cavity 9. The movable friction ring 6 is installed in the sleeve 10 and sealed by secondary seals 11 and 12. In the sleeve 10, conical radially placed cavities 13 are made, which are connected by longitudinal channels 14 with an annular groove 7, and closed by balls 15 with the help of plate springs 16. The sleeve 10 is connected to the shaft 17 by a key 18 and is sealed by a secondary seal 19. The stationary friction ring 1 is pressed against the movable ring 6 by a pressure element 20 through a spring 21 .

Sealing works as follows. at

When the shaft 17 is stopped, the sealing of the seal is carried out by the junction of the friction rings 1 and 6 due to its pressing by the pressure element 20 through the spring 21, and the conical radially placed cavities 13 are closed by balls 15 with the help of plate springs 16. When the shaft 17 rotates, the sleeve 10 with the ring Z friction 6. The condensed liquid tries to penetrate through the junction of the friction rings 1 and 6 to the outside and enters the annular groove 7, which is made in the form of a rectangular trapezoid, the outer side of which is inclined at an angle of 39 to the rotation of the ring 6 and has a chamfer 8 , which forms a wedge-shaped annular cavity 9. Under the action of centrifugal force, the compacted liquid is pressed against the outer side of the groove 7 and part of it enters the wedge-shaped annular cavity 9, where it forms a hydraulic lock that prevents the compacted liquid from entering the annular groove 7. The compacted liquid that remains in ring groove 7 moves to the conjugate channels 14, through which it enters the ra diametrically placed cavities 13. Under the action of centrifugal force, the compacted C liquid presses on the balls 15, overcoming the elasticity of the springs 16 and through the created gap is ejected back into the compacted cavity c. When the oddentrovy force is reduced under the action of the elastic force of the springs 16, the balls 15 are tight

From" close the conical radially placed cavities 13. This blocks the back penetration of the compressed liquid through the conical radially placed cavities 13 and the longitudinal channels 14 into the annular groove 7 and further to the outside.

Thus, the proposed design of the end seal complicates the possibility of penetration - 45 of the compacted liquid to the annular groove and excludes the possibility of penetration of the compacted liquid to the outside. at

Claims (1)

The formula of the invention of them 20 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 on the friction surface of the rotating ring, an annular groove sl of a trapezoidal profile is made, which, on the side of the base, is connected by axial channels with conical radially placed cavities, which are connected to a sealed cavity, from which they are separated by balls by means of plate springs fixed on the outer surface of a rotating sealing ring, 29, which differs in that a chamfer is made on the outer side of the trapezoidal ring groove, which GF) forms a wedge-shaped annular cavity into which, under the action of centrifugal force, compressed liquid enters and forms a hydraulic lock, which reduces the flow of liquid. name) 60 b5