RU2150638C1 - Device for securing fire tube in combustion chamber housing - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: proposed device includes retainer whose spherical end is inserted in ring secured on fire tube and its second flanged end is secured on flange of housing and stack of disk springs with device for pressing this stack. Spherical end of retainer is made in form of collet. Fitted in central hole of retainer is pin whose one taper end rests against taper bevels of collet tabs and other threaded end with nut screwed on it compresses disk spring stack located in sleeve mounted on retainer flange. Springs release tabs of retainer collet by taper end of pin. EFFECT: enhanced reliability; increased service life. 2 dwg

Description

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

 A device for attaching a flame tube in a combustion chamber housing is known, comprising supports uniformly spaced around the circumference and fingers pivotally connected at one end to the flame tube and the other to a combustion chamber housing (ed. St. USSR N 240391, F 02 C, 1963 )

 However, the known device is unreliable, because when working under the action of high temperatures and thermal movements of parts, jamming of joints can occur.

 A device for mounting a flame tube in a combustion chamber housing is known, comprising a retainer, a spherical end of which is inserted into a ring fixed in the flame tube, and a second flange end thereof is fixed to the housing flange, a disk spring package with a device for preloading it ("Operational Manual engine NK-16ST ", book. 2, NTO" Trud ", 1984).

 A disadvantage of the known device is low reliability and low resource. In it, a package of springs is located near a stream of hot gases and a heat pipe heated to high temperatures. Thermal radiation and hot gases will heat the spring package until they lose elasticity, and the package will not perform its functions. The absence of preloading of the fixation elements by the package will lead to mutual displacements and impact of parts under the influence of vibrations, which will cause hardening and increased wear, which reduce the service life.

 The purpose of the invention is to increase the reliability and service life.

 This goal is achieved by the fact that the spherical end of the clamp is made of a collet, and a finger is installed in the central hole of the clamp, resting on one conical end on the tapered bevels of the collet petals, and the second threaded end with a nut screwed on it compresses a packet of Belleville springs placed in a glass mounted on a retainer flange. The spring package by the tapered end of the finger unclenches the petals of the collet of the retainer.

 In FIG. 1 shows a General view of the device as part of a combustion chamber; in FIG. 2 - section aa along one of the latches.

 The device for attaching the flame tube contains a latch 1, the spherical end 2 of which is inserted into the ring 3, mounted on the flame tube 4, and the second flange end 5 is mounted on the flange 6 of the housing 7, the disk spring package 8. The spherical end 2 of the latch 1 is made collet with longitudinal cuts 9. A finger 10 is installed in the central hole of the latch 1, resting on the conical end 11 on the conical bevels 12 of the collet petals, and the second threaded end with the nut 13 screwed onto it with the washer 14 compresses the disk spring package 8. To hold of the lighter 10 from turns while screwing the nut 13 there is a tetrahedral protrusion 15, and a cotter pin 16 is installed in the hole of the finger against unscrewing during operation. The spring package 8 is placed in the cup 17 mounted on the flange 5 of the latch 1.

 During assembly, a pack of springs 8 compressed by a nut 13 will press the tapered end 11 of the pin 10 to the bevels 12 of the retainer 1 and press the collet petals to the ring 3. The spherical end 2 of the retainer 1 will tightly work on the surface of the ring 3.

 During operation of the device as part of the combustion chamber of a gas turbine engine, a package of springs ensures the gapless operation of sphere 2 in ring 3, which eliminates the impact of joint elements under the influence of vibrations, eliminates hardening and increased wear of the retainer and ring of the gas pipe, providing an increased service life. The package of springs 8 is located here in the cold zone, which excludes heating by hot gases and radiation from the flame tube, and this increases the reliability of the package.

 Experimental specimens are made and tested as part of gas turbine engines. Confirmed claimed benefits.

Claims (1)

 A device for attaching a flame tube in the housing of the combustion chamber, containing a latch, the spherical end of which is inserted into a ring mounted on the flame tube, and the second flange end thereof is fixed to the flange of the housing, a disk spring package with a device for preloading it, characterized in that the spherical end the clamp is made of a collet, and a finger is installed in the central hole of the clamp, resting on one conical end on the conical bevels of the collet petals, and compressing the packet with the second threaded end with a nut screwed on it Belleville springs placed in a cup mounted on the flange of the clamp, while the springs tapered end of the finger open the petals of the collet of the clamp.

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