SU1413339A1 - Shaft gland - Google Patents

Abstract

The invention relates to a sealing technique and can be used in hydraulic units, compressors and pumps. The purpose of the invention is to improve the reliability of the seal. The shaft seal 1 contains a housing 2, a pressure device (LC) 3, a stuffing box (CK) 4. Well 3 covers the CK 4 with a radial clearance 5. CK 4 is equipped with an outer annular collar 7, in the bore of which an elastic sealing ring 8 is placed forming a movable contact pair with a counter surface 9 of the HU 3, the gland packing 10 is placed on the IC 4 and pressure rings (NK) 11 and 12 on the other side, NK 1i, located on the side of the pressure-sealing chamber 6, are provided with elastic elements 13 evenly distributed on the free face at NK I. Elastic elements 13 connect case 2 and NK 1f which is fixed against rotation relative to CK 4 by means of pins 15 .. Pins 15 are placed in response grooves 16 of NK 11, Reliability of operation of the node is ensured by eliminating the possibility of sudden depressurization of the node. 2 3, п, ф-л, 3 Il. "(L

Description

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The invention relates to a sealing technique and can be used in hydraulic units, compressors and pumps.

The purpose of the invention is to increase the reliability of compaction by eliminating the possibility of its sudden failure and depressurization.

FIG. I presents the proposed seal, a longitudinal section; Fig. 2 shows an example of fixing the pressure ring from the wire in the stuffing box; FIG. 3 shows an example of making grooves in a stuffing box

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The gland seal 1 comprises a housing 2, an axially movable and pressurized relative to the housing 2, a pressure device 3 / enclosing a pressure box 4 with a radial clearance 5 and a chamber 6 of compressed pressure. In the bore of the outer ring collar 7, made on the stuffing box 4, an elastic sealing ring 8 is placed, which forms a movable contact pair with the counter surface 9 of the pressing device 3. The gland packing 10 and pressure rings II and 12 are installed in the gas box 4. The pressure ring 11, located on the side of the chamber 6 of the pressurized pressure, is provided with elastic elements 13, which are evenly distributed over its free End 14 and connect it with case-2. The elastic elements I3 are inclined towards the end 4 of the pressure ring 11 in the direction opposite to the direction of rotation of the shaft I (as viewed from the side of the pressure ring 11). The ring 11 is fixed against twisting in the stuffing box 4 (fig. O by means of pins 15 rigidly fixed in the stuffing box 4 and entering into the response grooves 16 of the pressure ring 1I. It is possible to fix the pressure ring 11 in the stuffing box 4 by means of a key. In addition, the pin 15 can be rigidly fixed on the pressure ring II, and the free end can enter into the answer 17, the groove 18 open from the end 17 (FIG. 2), made in the stuffing box 4 and perpendicular to its end 17 (parallel to the shaft axis 1)

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Open from the end 17 of the grooves 19 can be performed at an angle to the end 17 of the stuffing box 4, and the direction of inclination of the grooves 19 coincides with the direction of inclination of the elastic elements 13 (fig.Z)

The pressure ring 12 is designed for easy disassembly and re-sealing of the seal. For this purpose, the pressure ring 12 stops t from the axial displacement relative to the shaft 1. Thereafter, the stuffing box 4 is removed from the gasket 10 and the pressing rings II and 12 by axial displacement from the housing.

Gland seal shaft works as follows.

When the pressure device 3 is axially moved, its end surface 9 compresses the sealing ring 8, sealing the chamber 6. The axial force from the ring 8 is transmitted to the collar 7 of the stuffing box 4 and then to the pressure ring 12. Due to the axial movement of the stuffing box 4 together with the pressure ring 12 The gland packing 10 presses against the pressure ring I1 and, expanding in the radio direction, presses against the shaft 1 and the gland box 4, sealing the chamber 6. At the same time, the compressing gasket 10 transfers axial force to the pressure ring 11, when moving axially, it deforms the elastic elements 13. From the side of the rotating shaft 1, which almost always has misalignment, the radial forces are transmitted to the packing 10 and are further perceived by the packing box 4 and the pressure rings 11 and 12. Due to the radial compliance of the elastic elements 13 and the radial mobility of the contact pair; an elastic ring 8 — the response surface 9 of the pressing device 3, the functional package consisting of the packing 10., the stuffing box 4 and the pressing rings 11 and 12, tracks the radial movement of the shaft I, which protects the packing 10 from the cyclic mechanical action of the shaft 1, as a result of which the wear of the sealing assembly is reduced and its operation reliability increases.

The gasket 10 is acted upon by the moment of the frictional friction force from the side of the rotating shaft 1, which is

Mits carry cap 10 into circular traffic. Under normal operation of the seal, the circumferential force is balanced by the frictional force between the elastic ring 8 and the counter surface 9 of the pressing device 3, as well as by the force of the deformed elastic elements 13 having angular rigidity. If the moment of friction of shaft 1 about gasket 10 increases, the circumferential force acting on the pressure ring 11 from the stuffing box 4 increases. In this case the rotation of the pressure ring 11 is accompanied by its displacement in the direction of the body 2 by deforming the elastic elements 13, which weakens the compression gasket 10 and reduces the moment of its friction on shaft 1. Thus, between the moment of friction of shaft I and gasket 10 and the force of compression of the latter, negative feedback is established, which ensures the maintenance of an optimal mode of friction in compression enii, increases its reliability and durability.

In the embodiment, in which the pressure ring is provided with pins, which enter the open grooves of the stuffing box, with a sharp increase in the moment of friction under the gasket 10, and hence, the large angle of rotation of the stuffing box 4, the pressure ring 11 is displaced by elastic elements 13 to the side the housing 2 is of such magnitude that the pins 15 exit from the grooves 18 of the stuffing box 4. The circumferential force acting from the stuffing box 4 on the pins 15 disappears and the further deformation of the elastic elements 13 stops.

The packing box 4 with the packing 10 is rotated behind the shaft to a part of the rotation proportional to the number of slots 18 until the latter is aligned with the pins 15 of the pressure ring P. As the pressure ring 11 is spring-loaded with deformed elastic elements 13, the pins 15 enter into the grooves 18 of the packing box 4 and the mode of operation is normalized. The geometrical dimensions of the pressure ring 11, the pins 15 and the grooves 18 are selected so that the pins 15 emerge from the grooves 18 when the deformations of the elastic elements 13 are smaller than the allowable values that

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protects the elastic elements 13 in case of sudden overloading of the seal and increases reliability.

Claims (3)

1. The shaft seal, comprising a housing, a pressure device, a stuffing box, covering the stuffing box and pressure rings located on either side of it, one of which is secured against rotation in the stuffing box and provided with elastic elements evenly placed along its free end with a slope against the direction of rotation of the shaft from the side of the pressure ring, characterized in that, in order to increase reliability, the elastic elements are connected to the housing on the outer surface of the stuffing box There is a ring collar with a bore on the end surface, in which an elastic sealing ring is installed, ... forming a contact pair with the counter surface of the pressure device, which encloses the stuffing box with a radial clearance. 2. Sealing pop. 1, which differs from the fact that the pressure ring on the housing side is secured against rotation by means of installed -. the pins inside it, the grooves in the stuffing box, which are made in the stuffing box, are open from the end of the grooves, 3. Sealing according to claim 1, about t l and h aa yu e so that the grooves in the stuffing box are inclined to its end, and the directions of inclination of the grooves and elastic elements coincide. Editor A.Lezhnina Compiled by I. Pashchenko Tehred L. Oliynyk. Corrector V.Girn to Order 3759/37 Circulation 7.84 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 f5 ti ui.2 f5 19 14 Faq Subscription