RU2177114C2 - Device for fastening of flame in combustion chamber body - Google Patents

Abstract

FIELD: manufacture of gas-turbine aircraft engines. SUBSTANCE: device for fastening of flame tube in combustion chamber body has pins with flanges. Pins are secured to body flanges by bolts with their one ends, and their other ends are installed through holes in body flanges into holes of inner race of hinged bearings secured in its turn in bosses of flame tube. Outer races of hinged bearings are combined of two circular parts. One ring is installed in boss with preload over outer diameter and pressed to boss and face. The other ring is installed with axial clearance relative to the first ring with diametrical gap in boss and spring-loaded in axial direction by pack of disc springs. EFFECT: higher operating reliability and prolonged service life. 3 dwg

Description

 The invention relates to a gas turbine engine, in particular to combustion chambers.

 A device for mounting a flame tube in the housing of the combustion chamber, containing supports on the housing and fingers with flanges and with spherical ends placed in the bushings on the flame tube [1].

 However, the presence of a gap in the connection of the finger sphere with the sleeve leads to increased wear of the finger and sleeve due to mutual displacements and collisions under the influence of vibrations.

 A device for mounting a flame tube in the housing of the combustion chamber, containing fingers with flanges, mounted on the flanges of the housing with bolts, and other ends through holes in the flanges of the housing, inserted into the holes of the inner rings of articulated bearings, mounted in the bosses on the flame tube [2].

 A disadvantage of the known device is low reliability and low resource. The existing small mounting clearance on the surfaces of the spherical bearing rings increases as the operating time increases. Abrasion of mating surfaces occurs due to the presence of mutual multiple movements of structural elements under the action of vibrations. When the gaps increase, wear is added to abrasion due to hardening (contact corrosion) in addition to abrasion due to collisions of the bearing elements through the increased gap. These factors lead to premature wear and destruction of parts, to a decrease in service life and reliability.

 The technical result achieved by the invention is to increase the reliability and resource of work.

 The technical result is achieved by the fact that the outer rings of the articulated bearings are made up of two ring parts, one of the rings is installed in the boss with an interference fit on the outer diameter and pressed against the end of the boss, and the second ring is installed with an axial clearance relative to the first with a diametrical clearance in the boss and is axially spring-loaded with a cup-spring package.

 The design provides clearance-free operation of the elements, eliminates the collisions of the elements and the appearance of rivets and additional wear, which ensures an increase in service life and reliability.

 In FIG. 1 shows a General view of the device as part of a combustion chamber; in FIG. 2 - section aa along a pair of fasteners; in FIG. 3 - element B, one of the bosses of the flame tube with an articulated bearing and the end of the fastening pin installed in it is separately shown.

 A device for attaching a flame tube in the housing of the combustion chamber contains fingers 1 equally spaced around the circumference with flanges fixed to the flanges of the housing 3 by bolts 4, and the other ends through holes in the flanges 2 inserted into the holes of the inner rings 5 of the spherical bearings mounted in the flame tube 6 bosses 7. The outer rings of the spherical plain bearings are made of two annular parts 8 and 9. Ring 8 is mounted in the boss 7 with an interference fit on the outer diameter and pressed against the boss end. The ring 9 is installed with an axial clearance B relative to the ring 8 and with a diametrical clearance G in the boss 7. Ring 9 is spring-loaded by the spring package 10.

 During operation of the device in the engine under the influence of vibrational mutual movements of structural elements, wear may occur at the contact points of the parts. During the wear process, the gaps in the proposed device do not appear, since under the influence of the spring package 10 the ring 9 is continuously pressed against the ring 5, and the ring 5 is pressed against the ring 8. The elimination of the gaps between the parts eliminates the impact of the parts against each other, which reduces wear and eliminates the appearance of hardening, and this provides an increase in resource and reliability, i.e. the achievement of the technical result is achieved.

Sources of information
1. V.F. Pavlenko et al. "Combat aircraft", M., Military Publishing House, 1984, p. 185.

 2. "Manual for the technical operation of the engine NK-16ST", book 2, NPO "Trud", 1984, (prototype attached).

Claims (1)

 A device for mounting a flame tube in a housing of a combustion chamber, comprising fingers with flanges, bolted to the flanges of the housing, and other ends through holes in the flanges of the housing, inserted into the holes of the inner rings of the spherical bearings, mounted in the bosses on the flame tube, characterized in that the outer the rings of the spherical bearings are made up of two ring parts, one of the rings being installed in the boss with an interference fit on the outer diameter and pressed against the end of the boss, and the second ring is mounted axially the gap with respect to the first with a diametrical clearance in the boss and is axially spring-loaded with a disk spring package.

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