SU1185003A1 - Shaft seal - Google Patents

Abstract

1. A seal of a shaft, mainly a main oil pump, consisting of a main mechanical seal and a backup, made in the form of a lip-face seal, whose elastic cuff is installed with the possibility of movement in the axial direction in case of an emergency leak through the main seal, characterized by that, in order to increase the service life of the backup seal and reliably seal the shaft by evenly distributing the load on the areas of the radial and front contacts, the reserve sealed and, the end surfaces of the latter are made at an angle relative to the shaft axis, equal to the friction angle of the FRIEND of the friction pair materials. 2. The seal according to claim 1, distinguished by the fact that, in order to divert possible leakage through the substrates (L seal, the cuff is mounted on the shaft with a gap along the seal housing. 00 Oi Od

Description

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The invention relates to devices for sealing the shaft exit from the body of a centrifugal pump intended for pumping oil and oil products through main pipelines, and can be used to seal the shafts of pressure hydraulic systems.

The aim of the invention is to increase the service life of the backup seal and reliably seal the shaft by uniformly distributing the load over the areas of the radial and face contacts of the backup seal.

FIG. 1 shows a seal, a general view; on . 2 - backup seal in working condition.

The seal will consist of contact rings 1 and 2, a pair of friction of the main seal, shaft sleeve 3, seal housing 4, axially movable sleeve 5 and backup seal 6 in the form of an elastic cuff with a face

a surface inclined at an angle to the axis of the shaft, equal to the angle of friction of the rest of the materials of the pair of friction backup seal.

The device works as follows.

In the event of failure of the main seal with a pressure Pd of the medium to be sealed, the cuff is tightly seated on the shaft with a gap relative to the seal housing J is pressed against the end surface of the housing and the radial surface of the seal shaft sleeve.

Since the end surface L is inclined to the axis of the shaft at an angle o, in addition to the normal force N, a tangential force arises T. Since the angle of inclination is equal to the friction angle, the tangential force applied to the cuff ensures uniform distribution of the load across the width of the contact, thus achieving a normal mode friction.

Claims (2)

1. SHAFT SEAL, mainly a main oil pump, consisting of a main mechanical seal and a backup, made in the form of a mechanical seal, the elastic sleeve of which is installed with the possibility of movement in the axial direction in case of emergency leakage through the main seal, characterized in that, with the purpose of increasing the life of the backup seal and reliable sealing of the shaft by uniform distribution of the load on the area of the radial and mechanical contacts of the backup seal, then the front surfaces of the latter are made at an angle relative to the axis of the shaft equal to the angle of rest friction of the materials of the friction pair. 2. Seal by π. 1, characterized in that, in order to divert a possible leak through the main seal, the cuff is mounted on the shaft with a gap in the seal housing. SU „1185003 Fig f 1 185003