SU1314167A1 - Shaft seal - Google Patents

Abstract

The invention relates to a sealing technique. The purpose of the invention is to improve reliability. The seal comprises a housing, in the annular cavity of which a floating ring is installed, installed with a gap relative to the shaft and separating the gas cavity from the atmosphere. The gap has a throttling and sealing areas, between which a step-like annular chamber with a guide device installed in it, made in the form of a cellular shell, is connected to it, connected to the housing cavity. A mechanical filler is located on the sealing area. The ring is secured by a pin. In the casing, a barrier fluid supply chamber is separated from the high pressure zone by an elastic ring. The presence of a guide vane reduces the flow of sealing fluid, and the presence of a cellular structure in the sealing section of the ring increases the reliability of the shutter and reduces the angular oscillation of the ring. 1 hp f-ly, 2 ill. With S (L SAO 4 05

Description

one

The invention relates to a sealing technique, in particular, to seals of a shaft with a floating ring and a hydraulic closure.

The purpose of the invention is to increase the reliability of work by reducing the angle angle of the ring.

FIG. 1 schematically shows the proposed seal ;, FIG. 2 view A in FIG. one.

The seal comprises a housing 1, in the annular cavity 2 of which an apavary ring 3 is installed, installed with a gap relative to the shaft 4 and separating the gas cavity from the atmosphere. The gap has a throttling 5 and sealing 6 areas, between which a step-like annular chamber 7 is made on the ring with a guiding device 8 installed in it, made in the form of a cellular shell filled with, for example, hexagonal cells, and connected by channels 9 with a cavity 2 A cellular filler 10 is placed in the sealing area of the floating ring 10. The ring is fixed in the circumferential direction by pin 11. In the housing there is a chamber 12 for supplying barrier liquid, separated from the high-pressure zone with an elastic ring 13.

Seal works as follows.

The shut-off fluid under pressure exceeding the pressure in the high-pressure cavity (gas chamber) is fed into chamber 12, from which through channels 9 enters the stepped annular chamber 7, in the inner portion of which a guide apparatus 8 is installed. shells. The barrier fluid after the guiding device 8 enters the sealing 6 and throttle 5 sections of the gap, creating

Y2

Giving - hydraulic valve between the high pressure cavity (gas chamber) and the low pressure cavity. After the guiding device, there is no circumferential velocity component at the barrier fluid, which leads to a decrease in its consumption.

The presence of a cellular structure on the sealing area of the floating ring contributes to the formation of a reliable liquid shutter that prevents gas leakage, increases the sealing ability of the seal, thereby ensuring effective sealing. In addition, the cellular structure provides more intense heat removal from the bolt in the sealing gap into the body of the floating ring and reduces the angular oscillations of the ring.

Claims (2)

1. The shaft seal, comprising a housing with a barrier fluid supply chamber and an annular cavity, in which a floating ring is installed with a clearance relative to the shaft, the gap having sealing and throttling portions separated by an annular chamber on the ring communicating with the housing cavity; that, in order to increase reliability of operation, the floating ring is provided with a cellular filler, which forms a sealing section, and a guide device is made between the throttle and sealing sections 2. Sealing according to claim 1, about tl, which means that the guiding apparatus is made in the form of an annular groove filled with cellular filler,  11 3 2 783 G2 / Type A fic one FIG. 2