SU1209935A1 - Packing system of multistage centrifugal compressor - Google Patents

Description

The invention relates to a compressor structure, in particular to sealing systems of multi-stage centrifugal compressors.

The purpose of the invention is to simplify the design of the system and increase the efficiency of the compressor.

FIG. 1 shows a compressor with a sealing system, a longitudinal section; Fig. 2 shows a variation of the sealing system.

The sealing system of a multistage centrifugal compressor contains a float chamber 1 with a gas cavity 2 and a float chamber 3 with a gas cavity 4, the gas cavities 2 and 4 being connected by pipelines 5 and 6 to the oil collecting cavities 7 and 8 of the seal, and a channel 9 connected at one end to the radial-axial inlet 10 of the first stage 11 of the compressor 12. In addition, the system is equipped with a second channel 13, also connected to the inlet 10. The other end of the channel 9 is connected to the gas cavity 2 of the float chamber 1, and the channel 13 to the gas oh cavity 4 of the float chamber 3, the channel connecting space 9 to the inlet 10 is arranged on a diameter DI, D9 smaller inlet diameter of the impeller 11 of the first stage.

The connection point of the channel 13 to the inlet 10 may also be located on the diameter DS smaller than the input diameter D2 of the impeller of the first stage 11.

In addition, the system contains end labyrinth seals 14 and 15 of shaft 16 with gas cavities 17 and 18, labyrinth seal 19 of dummis 20 and a gas cap cavity 21, with cavities 17 and 18 communicating with each other by channel 22.

When the compressor 12 is operating, the compressed liquid, whose pressure is higher than the pressure of the compressed gas, partially penetrates into the oil-collecting cavities 7 and 8. High-pressure gas passes through the labyrinth

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The second seal 19 of the dummy 20 has a pressure slightly higher than the pressure at the inlet to the first stage 11 of the compressor 12 (by the resistance of the pipeline connecting the cavity 21 to the inlet 10). Therefore, the gas then enters the gas cavity 18, from where a part of the gas passes through the labyrinth seal 15 to the side of the oil-collecting cavity 8, blocks the path of the liquid particles and then draws the liquid from the cavity 8 through the pipeline 6 to the gas cavity 4 of the float chamber 3. From the cavity 4 the purified gas enters the inlet 10.

Another part of the gas from the cavity 18 through the channel 22 enters the end labyrinth seal 14 into the gas cavity 17, from where a part of the gas enters the oil collection cavity 7 and further along the pipeline 5 into the gas cavity 2 of the float chamber 1. Since the place where the channel 9 is connected connecting the cavity 2 of the float chamber 1 to the inlet 10, is on a diameter DI smaller than the input diameter D2 of the impeller of the first stage 11 (where the pressure is minimal), the gas flow is always directed towards the inlet 10.

With more wear of the labyrinth seal 14, the gas can go from the inlet 10 through the channel 13 through the cavities 4 and 8 and the channel 22 in the direction of the entrance to the first stage 11.

In the embodiment of the sealing system (Fig. 2), the channel 13 of the float chamber 3 is connected to the inlet 10 also at the diameter of the RE, which is less than the input diameter Dz of the first-stage impeller.

The proposed implementation of the system makes it possible to simplify the regulation of the system by using a vacuum in the inlet manifold, reject special regulating differential pressure devices, and increase the efficiency of the compressor, eliminating the need to take compressed gas for the needs of the seal.

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Claims (3)

1. SEALING SYSTEM MULTI-STAGE CENTRIFUGAL COMPRESSOR, containing two float chambers with gas cavities. each of which is connected by a pipeline to the oil-collecting cavity of the seal, and a channel connected at one end to the radial-axial inlet pipe of the first stage of the compressor, characterized by heme, which, in order to simplify the design of the system and increase the efficiency of the compressor, the system is equipped with a second channel also connected at one end to the inlet pipe, and at the other end both channels are connected to the gas cavities of the float chambers, and the place of connection of the first channel to the inlet pipe is located at a diameter smaller than the input diameter impeller of the first stage. 2. The system by π. 1, characterized in that, in order to increase reliability, the connection point of the second channel to the inlet pipe is also located on a diameter smaller than the input diameter of the impeller of the first stage. 4 17 11 1S 21 15 18 g Vtlt.f