SU1379552A1 - Shaft cellular seal - Google Patents

Abstract

The invention relates to a sealing technique and can be used in turbomachines for various purposes to seal rotating shafts. The goal is to increase the reliability and efficiency of compaction. The honeycomb shaft seal 2 contains a ferrule 3 mounted in the housing 1 with annular rows of cells 5, which are annularly concentrated with annular chambers 4. The annular chamber 4 is made at a distance of 0.2-0.25 of the cage length from the flow inlet side. Also, the annular chamber is intermittently intermittent, divided by radial bridges into a number of cavities 6, in the form of holes, with bridges located opposite cell faces, and bridges thickness greater than the thickness of the cell face. During operation, due to the presence of the discharge chamber 5, the pressure is equalized around the circumference and the damping of gas oscillations in the seal 1 ° C. f-ly, 4 ill. i (L

Description

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11379552

The invention relates to a sealing technique and can be used in turbomachines for various purposes to seal rotating shafts.

The purpose of the invention is to increase reliability and efficiency by eliminating high-frequency pressure pulsations.

FIG. 1 shows a cellular seal, a longitudinal section; in fig. 2 - section A-A in FIG. 1j in FIG. 3; section B-B in FIG. 1 in FIG. 4, view B in FIG. 1

The honeycomb shaft seal comprises a shaft 3, which is fitted with a gap, and is mounted in the housing 1, with a ring 3 with annular rows of cells 5, concentrically with which the annular chamber 4 is located.

The annular chamber 4 is made intermittently divided by radial lintels 7 into a series of cavities 6, the lintels are located opposite the partitions between the cells, while the thickness of the lintels is greater than the crackle partitions. The annular chamber 4 is located at a distance of 0.2-0.25 length

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arms and damping of gas oscillations in compaction

The choice of the optimal location for the annular discharge chamber is determined by the following conditions: at a distance of 3-5 mm from the inlet of the flow of compacted medium in the cage, which is usually less than one fifth of its length, there is an abrupt decrease in pressure of the compressed medium, the displacement of the annular an unloading chamber at a distance of one quarter of the length of the cage from the entrance to the cage may result in the appearance of a dynamic (pulsating) component of the centering force and the camber tilt relative to the shaft

Claims (2)

1. A honeycomb shaft seal containing a sealed shaft enclosing a gap with a gap, with annular rows of cells, concentrically located an annular chamber, characterized in that, in order to turn from the inlet side of the seal flow, reliability and efficiency of nenomah environment. Seal works as follows. High-pressure sealing medium enters the honeycomb seal and is throttled in the gaps between the ends of the cells and the surface. 35 bots due to the elimination of high-frequency pressure pulsations, the annular chamber is made intermittently separated by radial bridges into a series of cavities, bridges are located opposite the partitions between the cells, with the thickness of the bridges greater than the thickness of the partitions. the shaft, after which it falls into the cell cells 5, where its velocity decreases. Due to the presence of an annular discharge chamber 4 connected to the cells 5, the pressure is equalized by ca. arms and damping of gas oscillations in compaction The choice of the optimal location for the annular discharge chamber is determined by the following conditions: at a distance of 3-5 mm from the inlet of the flow of compacted medium in the cage, which is usually less than one fifth of its length, there is an abrupt decrease in pressure of the compressed medium, the displacement of the annular an unloading chamber at a distance of one quarter of the length of the cage from the entrance to the cage may result in the appearance of a dynamic (pulsating) component of the centering force and the camber tilt relative to the shaft Invention Formula 1. Cellular shaft seal, containing a sealed shaft enclosing with clearance, with a ring with annular rows of cells, concentrically located an annular chamber, characterized in that, in order to increase the reliability and efficiency of 35 40 / I bots due to the elimination of high-frequency pressure pulsations, the annular chamber is made intermittently separated by radial bridges into a series of cavities, bridges are located opposite the partitions between the cells, with the thickness of the bridges greater than the thickness of the partitions. 2. A seal according to claim 1, characterized in that the annular chamber is located at a distance of 0.2-0.25 of the length of the sleeve from the inlet side of the flow of the medium to be compacted. sr1 / g.2 Fig.d the form FIG.