SU1483148A1 - Shaft seal - Google Patents

Abstract

The invention relates to a sealing technique and can be used to seal rotating rollers in pumps, compressors and turbines. The purpose of the invention is to increase the reliability and durability of work due to the intensification of the heat sink. The seal contains installed in the housing of the inner and outer floating rings with an intermediate chamber between them. The housing is provided with locking fluid inlet and outlet chambers located at an angle of 180 ° in the same radial plane, and an adjustable pressure chamber connected to a pressure differential regulator. At the end of the outer ring, on the low pressure side, there is a buffer annular cavity, and in its body — a system of channels displaced relative to each other in the circumferential direction connecting the chambers in the following sequence: supply chamber — buffer cavity — intermediate chamber — adjustable pressure chamber — outlet chamber wherein the adjustable pressure chamber communicates with the hydrostatic pockets of the outer ring. When the locking fluid circulates through the channels of the outer ring, it is effectively cooled. 8 il.

Description

The invention relates to a sealing technique and can be used to seal rotating shafts in pumps, compressors and turbines.

The purpose of the invention is to increase the reliability and durability of work due to the intensification of the heat sink.

FIG. 1 schematically depicts the proposed seal; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. 3; in fig. 5 is a section of YYD in FIG. 3; in fig. 6 is a section d-d in FIG. 3; in fig. 7 shows section EE of FIG. 3; in fig. 8 - section MF in FIG. 7

The shaft seal contains inlet body 2 inlet 2 and outlet 3 of the chamber for supplying and discharging the locking fluid, a chamber 4 of adjustable pressure associated with a pressure differential controller (not shown), an inner 5 and outer 6 with hydrostatic pockets 7 and floating rings an intermediate chamber 8 between them, and on the end surface 9 of the outer floating ring 6, annular shoulders 10 are made and an elastic sealing ring 11 is installed. The chambers 2 and 3 of the supply and discharge of the locking fluid are located under the warp 180 ° each n rotate each other in the same radial plane and are interconnected by a system of bypass channels 12-15 displaced relative to each other in the circumferential direction, made in the outer floating ring and channels 16 in the compression housing 1. The bypass channels 12 connect

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between each other, the inlet chamber 2 for supplying a barrier liquid with a buffer cavity 17, formed on the end surface of the outer floating ring 6. The overflow channels 13 interconnect the buffer cavity 17 with the intermediate chamber 8 between the rings 5 and 6. Overflow channels 14 connect the intermediate a chamber 8 with an adjustable pressure chamber 4, which in turn is connected to a differential pressure regulator (not shown), by means of bypass channels 15 with hydrostatic pockets 7 and by means of channels 16 with an outlet chamber 3 fluid.

Shaft seal works as follows.

When the machine is running, for example a compressor, a locking fluid, such as oil, is supplied to chamber 2 at a pressure greater than the pressure of the sealing gas. In this case, the locking liquid, which is throttled in the sealing gaps between the floating rings 5, 6 and the shaft, prevents leakage of the compressed gas. To ensure rational organization of the heat sink from the heat-loaded internal floating ring 6, cold oil is bypassed from chamber 2 through channels 12 into the buffer cavity 17, while cooling the body of ring 6 and hydrodynamically unloading the joint between end surface 9 of ring 6 and housing 1 with low pressure side. Next, the oil bypass is carried out through the channels 13 into the intermediate chamber 8 between the rings 5 and 6, while removing heat.

Then the oil enters through the channels 14 into the chamber 4 of the regulated pressure, where the pressure is controlled by means of a pressure differential controller between the oil to be compacted and the compressible oil.

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gas. From the chamber 4, the oil through the channels 16 partially goes to drain through the output chamber 3, and partially flows through the bypass channels 15 to the hydrostatic pockets 7.

Thus, the advantage of the proposed seal is to intensify the heat sink from the outer floating ring, improve working conditions and ensure improved reliability and durability.

Claims (1)

Invention Formula The shaft seal contains internal high and low pressure separating areas of the housing and outer floating rings with hydrostatic pockets with an intermediate chamber between them, with annular shoulders made on the low surface of the outer ring and an elastic sealing ring in the housing of the supply and removal chamber of the locking fluid, and the chamber of adjustable pressure associated with the pressure differential regulator, characterized in that The purpose of improving reliability and durability due to the intensification of heat dissipation, the chamber of discharge and supply of locking fluid are located at an angle of 180 ° in the same radial plane; relative to each other in the circumferential direction of the channels connecting the chambers in the following sequence: supply chamber — buffer cavity — intermediate chamber — adjustable pressure chamber — chambers and a diverter, wherein the pressure-regulated chamber is also in communication with the hydrostatic pockets. And s  H IS 715 g 3 A-A, JS 1B G / Phase.1 / B - 5 K 17 12 fig.Z Yr Fi.g.5 ll Phage.6 HER Phage.7 Female