SU1460503A1 - Rotary shaft seal - Google Patents

Abstract

The invention relates to sealing technology and can be used in centrifugal compressors and pumps. The purpose of the invention is to increase the reliability and durability of operation by reducing the temperature of the barrier fluid in the sealing gap. The seal contains installed with sealing gaps relative to the shaft in the chamber filled with barrier fluid under pressure, external smooth and internally ribbed floating rings, between which there is a distributor bushing forming bores with rings by bridges, adjacent to the sealing gaps, and a gate fluid, engulfing the rings and the sleeve, while the cavity supplying the barrier fluid is connected by channels in the sleeve with cavities adjacent to the sealing gap frames The sleeve is made of a material with low thermal conductivity. 1 hp f-ly, 3 ill.

Description

one

The invention relates to downstream technology and can be used in centrifugal compressors and pumps.

The purpose of the invention is to increase the reliability and durability of work by reducing the temperature of the barrier fluid in the sealing gap.

FIG. 1 depicts the proposed seal; in fig. 2 shows section A-A in FIG. one; in fig. 3 — Seal with the centering of the outer ring with self-aligning pads.

The seal of the rotating shaft contains the yoke 1, the cover 2, the outer 3 and the inner 4 floating rings mounted with sealing gaps 5 and 6 relative to the shaft 7. The yoke and the cap are sealed to the outer diameter with elastic rings o. Preload preload

Rings 3 and 4 to the end surfaces of the cage and the carriage are made by an elastic ring 9. Between the floating rings is placed a sleeve made of a material with low thermal conductivity distribution sleeve 10, the inner ring 4 that is sasopom M 11. To exclude movement in the radial direction and possible contact with the rotating shaft: the distributor sleeve is fixed on the inner ring by means of the landing gear 12. Floating rings and the distributor sleeve: they form a bridge 13 separated from each other by a jumper. olosti 14 and 15 adjacent the sealing gap 5 and 6 and the sealing liquid chamber for supplying the bone 16. In the junction body / sleeve is formed alternating between channels 17 and 18 (figure 2.), soybean: n

m

3 14 and

14

15 with cavity

recess cavities 16.

Compaction for high pressure compressors can be accomplished by centering the outer floating ring with self-aligning pads 19.

The seal of the rotating shaft works as follows.

The barrier fluid that enters the cavity 16 under pressure that exceeds the pressure of the compressed gas is divided into two streams. The first flow through the gap 11 between the sleeve 10 and the inner ring 4 removes some of the heat generated in the sealing gap 6 of the inner ring and through the channels 17 in the sealing sleeve 14, the cavity of the outer ring 3 merges into the oil tank. Another part of the sealing fluid from the cavity 16 through the openings 18, the cavity 15 is supplied directly to the entrance to the sealing gap 6 of the inner ring 4. The sealing fluid, throttling in the sealing gap between the rotating shaft 7 and the sealing gap 6, prevents the compressed gas from breaking through . Due to the fact that the distribution sleeve is made: of a material with low thermal conductivity, the heat removed by the first flow is practically not supplied to the rest of the barrier fluid. The flow rate of the barrier fluid through the outer ring significantly exceeds the flow rate through the inner ring, which means that, thanks to jumper 13, the flow of the barrier fluid from chamber 14 into chamber 15 is excluded.

Consequently, the temperature of the sealing fluid at the inlet to the sealing gap between the shaft and the inner ring will be close to the temperature of the sealing fluid at the entrance to the seal.

1460503

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and the amount of leakage into the gas cavity will be minimal.

Thus, placement between the floating rings of a distribution sleeve made of a material with low thermal conductivity, reduces leakage of the barrier fluid in the direction of the gas cavity, increasing the reliability and durability of the seal and the compressor as a whole.

Claims (2)

1. Seal rotating shaft containing outer smooth and inner ribbed floating rings installed with sealing gaps relative to the shaft in the chamber filled with barrier fluid under pressure, characterized in that, in order to increase the reliability and durability of work, the seal is provided with a distribution sleeve placed between floating rings - 25 and separated with them from each other made by the bridge of the cavity on the inner surface of the sleeve, adjacent to the sealing. the gaps, and the barrier fluid supply cavity, which encloses the floating rings and the distribution sleeve, in this case, the channels that connect the cavities to the sealing gap, and the sleeve, are made of a material with low thermal conductivity, are filled in the sleeve. 2. Seal to n.l, tl and h ate, with the distributor being made onto the sleeve with a skirt, covering the internal floating ring with a gap, and the channels connecting the cavity adjacent to the sealing gap of the external floating ring. with liquid supply slide cavity35 40 45 These are made with access to the gap between the skirt and the inner ring. 8 3 y / 1Л А-А  V 6 L 17, Fie.2 Fi.Z