SU1506209A1 - Labyrinth seal - Google Patents

Abstract

The invention relates to a sealing technique and makes it possible to increase the reliability of the seal. In the labyrinth seal, the ridge is made of a material with the possibility of moving and changing the gap between the sealing surfaces at the moment of transition from the inoperative state of the device to the working one, thereby reducing the leakage of the working fluid. 4 il.

Description

The invention relates to sealing technology and can be used, in particular, to seal shafts on the impellers of turbomachines.

The purpose of the invention is to increase reliability by reducing leakage of the working fluid through the pack. hardening

Fig. 1 shows the inoperative seal, section view; in fig. 2 - the same, with the bimetallic part 1 of the child, in FIG. 3 - the seal in the working state; in fig. 4 - the same, the detail is made from easy-to-process material “

The labyrinth seal consists of part 1, in which annular ridges 2 are made, made of bimetallic material (sheet) 3, 4 and entering with a gap 1 in annular grooves 5 about the colored part 6 To prevent shear stresses at the place of attachment of the ridge 2 to the part 1 bimetallic only 1 part of the ridge 2o protruding from the part

In order to prevent wear of the ridge 2 in the event ITM contacts the part 6, the latter can be made of a light-processing material.

When switching from the non-operating state to the working temperature of the sealing parts, the crest 2 is deformed and assumes the position shown in Figure 3. The gap 1 at the same time becomes minimal. In the case of the manufacture of the part 6 of the easily processed material after burn-in, the comb 2 takes the position shown in

Fig; 4 about

When using a bimetallic plate as the material of the ridge in the working condition, the minimum clearance is provided and, thus, the leakage of working fluid through the seal 3 is minimal.

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Claims (2)

Claims I. A labyrinth seal, the temperature of parts of which changes upon transition from non-working to working state, containing grooves in one of the parts that have annular ridges on the counter part, with a gap, o. It is distinguished by the fact that, in order to increase reliability by reducing the leakage of the working fluid through the seal, the crests are made of a material that can move and change the gap between the seal parts at the time of transition from the non-working to the working state. 2. The seal according to claim 1, about tl and - so that the ridges are made of bimetallic material, Compaction according to claim 1, of which is the ridge made of a material that has a shape memory. AO Seal according to claim 1, characterized in that the part of the ridge projecting from the part in which the ridge is fixed is made bimetallic. five Tszig.1 2 Fig.z Compiled by IoPashenko Editor AoShshikina Tehred M. Khodanych Order 5A10 / 38 Tir.azh 721 VNIIPI State Committee for Inventions and Discoveries at 1 ZhNT USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. FIG. Proofreader M. Pojo Subscription