SU1733787A1 - Shaft face seal - Google Patents

Abstract

The invention is intended to be compacted and to improve the reliability of the device. The sealing ring is made of two parts, one of which is in contact with the support cap. Parts end pins planted on the secondary seal. Parts of the sealing ring are connected by a fastener and a driving means with the shaft. The auxiliary stop of the cover is located with a gap relative to the membrane. 4 il.

Description

The invention relates to marine engineering and can be used to seal a rotating shaft with increased axial and angular movements.

The aim of the invention is to improve the reliability of the seal.

FIG. 1 shows the mechanical seal, section; figure 2 is a view of And figure 1; on fig.Z - section bb in figure 2; Fig. 4 shows a compaction variant.

A rolling or sliding bearing 2 is mounted on the shaft 1 of the mechanical seal (its structure and fastening are not shown) enclosed in the housing 3 and closed with screws 4 by a cover 5. The flexible membrane 6 is clamped along the outer contour and is located relative to the auxiliary stop 7 on the surface of the cover 5 facing the membrane, at a distance of the installation gap a equal to 1/8 of the tension of the membrane, and creates a contact pressure on the sealing rings 8 and 9 of the sealing ring 10 equal to 0.1-0.15 kg / cm.

The sealing ring is made of two parts interconnected by screws 11 and fitted with end flanges 12 and 13 on the rubber ring 14 X - or 0-section of the secondary seal with deformation of the latter by 5%.

The detachable collar 15 of the carrier device, fixed on the shaft neck, with two forks 16 symmetrically arranged on it and two pins fixed on the sealing ring, prevents the latter from slipping in the circumferential direction. A spare rubber ring 18, in case of damage to the main ring, is mounted under the bearing end of the support bearing without fastening. If the shaft does not have a sufficiently high step, replacing the rubber ring is difficult, a separate cheek 19 of the two halves should be provided from the sealing ring 19 (FIG. 2).

Seal works as follows.

When the shaft 1 is rotated, the rubbing force of the rubber ring 14 and the powered link ensure the rotation of the sealing ring 10 synchronous with the shaft.

Compaction is carried out on the end surfaces of sealing surfaces.

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rotating sealing ring 10, fixed cover 5 and resilient membrane 6. With significant axial and angular movements of the shaft 1, the sealing ring 10 remains in the same plane with the contacting elements as the elastic forces and the rubbing strength of the rubber ring 14 o two times less membrane force 6.

The overloads that can occur when the rubber ring 14 exits to the dry shaft and resonant inertia phenomena are removed from the membrane with an auxiliary stop 7, the working part of which is made rounded to prevent the membrane from sticking.

Tube 20 with a single file or valve-breather, introduced into the non-flooded area, ensure the normal operation of the support. In the case of large expected depths during flooding, this tube can be connected to an automatic follow-up system of pressurization of air or inert gas,

The replacement of the rubber ring 14 is carried out as follows.

The detachable yoke 15 is removed from the shaft, the lid 5 is detached from the housing and, together with the rest of the sealing parts, is retracted to the side along the shaft axis, a separate cheek 19 (if present) is removed. A worn or damaged rubber ring 14 is cut and removed.

In the reverse process sequence, the seal assembly is assembled with a new rubber ring 18, lubricated, adjusted in clearance a and checked in operation.

The signal for the next adjustment of the installation gap in the operating

conditions are the occurrence of oil leaks (more than 1-2 drops per minute). This means that wear is extreme, there is no sealing pressure in the friction pairs,

To restore the membrane tension, and, consequently, the contact pressure in the friction pairs, it is necessary to restore its position relative to the auxiliary stop, i.e. bring the gap to normal.

The design with a self-sealing arrangement of the elements of the mechanical seal allows, without reducing the reliability of its operation under water, to reduce the contact pressure in the rhenium vapor, to increase the durability and raise the limiting speed characteristic of the supports.

Claims (1)

Claims of the invention A mechanical shaft seal comprising a sealing ring in contact with the cover and the membrane clamped along the outer contour between the cover and the housing, and the rubber ring of the secondary seal, characterized in that, in order to increase the reliability of the sealing, the sealing ring is made of two parts with sealing along the edges in contact with the lid and membrane, and end pins fitted on the rubber ring of the secondary seal, the end surfaces of the parts of the sealing ring are You are attached to the secondary seal with fasteners interconnected, and with the shaft by means of support means, while on the surface of the lid facing the membrane an auxiliary stop is located at the level of the contact of the sealing parts with the lid and the membrane and with a gap relative to last. /four 18 Pue.i Vida fa 2 7 figl 5 B eight Rig.Z