SU1432299A1 - End seal - Google Patents

Abstract

. The invention relates to a sealing technique, namely to mechanical seals of rotating shafts. The purpose of the invention is to increase the reliability of the mechanical seal when operating under high temperature conditions. The seal includes a housing 1, a non-rotating friction ring, a composite of two elastic metal rings 3 and 4, the ring 3 having an L-shaped radial cross-section, and a ring 4 - rectangular, supplementing the L-shaped. The joints of the rings 3, 4 are diametrically opposed. The friction rings 2 and 10 are tucked in with a coil spring 12. The sealing of the gap between the body 1 and the friction ring 2 occurs due to the elastic properties of the rings 3 and 4. 1 Cp 6-ly, 2 ill. with

Description

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The invention relates to a sealing technique, namely to mechanical seals of rotating shafts under conditions of elevated temperatures.

The purpose of the invention is to increase the reliability of the seal operating at elevated temperatures.

Figure 1 shows the proposed mechanical seal, a longitudinal section; figure 2 - section aa in Fig., 1

The face seal comprises a housing 1, inside which a non-rotating friction ring 2 is installed, consisting of two elastic split metal rings 3 and 4. Ring 3 has an L-shaped radial section, and ring 4 has a rectangular one, which complements the L-shaped radial cross section of ring 3 to rectangular. The junction 5 of the ring 3 is diametrically opposite the junction 6 of the ring 4.

In the joints 5 and 6 there is a thermal gap (figure 2) and axial grooves 7 are made, the width of which with a fully closed joint, i.e. when the gap is equal to zero, is equal to the diameter of the pins 8. The depth of the grooves 7 is equal to the height of 1 part of the pins 8 protruding from the body.

The pins 8 secure the rings 3 and A against rotation relative to the housing 1, allowing them to move in the axial direction, which provides a ring wear composition and a seal to work when the end face 9 of the rotating friction ring 10 is pressed against the shaft 11.

The disc springs 12 rest on a removable retaining ring 13 installed in the groove of the housing 1, and ensure uniform friction of the non-rotating ring 2 friction to the end 9 of the rotating ring 10 friction.

Seal works as follows.

In a static position, the shaft 11 and the ring 10 pressed into it are fixed relative to the housing 1. At low ambient temperatures

thermal gaps in the joints of 5 and 6 rings

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3 and 4 are disclosed.

However, due to the fact that the joints 5 and 6 are diametrically opposed, and the non-rotating friction ring 2 is made in the form of two elastic metal-skull cut of the first rings, one of which has an L-shaped radial cross section,

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Another is rectangular, which complements the first to the rectangular, there are no guaranteed gaps in the seal. In the axial direction, the rings 3 and 4 are clamped together and pressed against the end 9 of the cup springs 12, which rest on the retaining ring 13. They are pressed against the body 1 due to their own elasticity. The radial clearance between the rings 3 and 4 is practically absent; therefore, in the static position, this mechanical seal ensures tightness.

When the shaft 11 rotates, the end surface 9 of the rotating friction ring 10 slides relative to the rings 3 and 4, which are kept from turning by the pins 8 entering the grooves 7. Through the thermal gaps in the joints 5 and 6 of the rings 3 and 4 the lubricant enters the friction zone, which increases the service life of the expected compaction.

Heating leads to a decrease in the thermal gaps in the joints of the rings 3 and 4, without disturbing the tightness and performance of the seal.

Removable snap ring 13 makes it easy to replace broken seal parts.

Claims (1)

1. A mechanical seal containing a body, a rotating ring of a threshing ring and a non-rotating friction ring pressed against it by an elastic element, fixed against rotation relative to the body, characterized in that, in order to increase reliability under conditions of high temperatures, the friction ring is made of two elastic split metal rings, one of which has an L-shaped radial section, and the other is rectangular, which complements the first to rectangular, and the joints of the rings are diametrically opposite, each time carved rings are fixed against rotation relative to the body and interact with it by the outer cylindrical surface. 2, a seal according to claim 2, characterized in that a spring is used as the / elastic element.