Turbomachine sparkplug fixing assembly

Patent metadata

Field	Value
Publication number	US-2016369701-A1
Application number	US-201415106162-A
Country	US
Kind code	A1
Filing date	Nov 26, 2014
Priority date	Dec 23, 2013
Publication date	Dec 22, 2016
Grant date	—

Abstract

Assembly comprising, on a turbomachine:—a combustion chamber ( 30 ) having a longitudinal axis ( 30 a ) and comprising: internal and external longitudinal walls ( 90 ) having a first opening ( 90 a ) substantially transverse to said axis ( 30 a ), an outer casing ( 110 ) having a second opening ( 110 a ) likewise substantially transverse to said axis ( 30 a ),—a turbomachine sparkplug ( 150 ),—a device ( 130 ) for radially securing the sparkplug ( 150 ), which device ( 130 ) comprises a sparkplug adapter ( 160 ) fixed toward a first end to the outer casing ( 110 ), facing the second opening ( 110 a ) and through which adapter and casing the sparkplug ( 150 ) in question passes, and a sparkplug guide ( 190 ) kept in contact with the external longitudinal wall ( 90 ), facing the first opening ( 90 a ) and through which the sparkplug ( 150 ) passes to emerge in the combustion chamber ( 30 ), the sparkplug ( 150 ) and the sparkplug guide ( 190 ) each having a screw thread ( 103, 105 ), the screw threads ( 103, 105 ) being screwed together so as to stabilize the sparkplug ( 150 ) radially to the axis ( 30 a ) of the combustion chamber ( 30 ) with respect to said external longitudinal wall ( 90 ), and—in this condition, the sparkplug ( 150 ) and the sparkplug guide ( 190 ) are mounted freely with respect to the outer casing ( 110 ) in a direction substantially radial to the axis of the second opening ( 110 a ).

First claim

1 . Assembly comprising, on a turbomachine:
a combustion chamber featuring a longitudinal axis and comprising: an air and fuel injection device, an internal longitudinal wall and an external longitudinal wall having a first opening substantially transverse to said axis, an outer casing having a second opening also substantially transverse to the axis of the combustion chamber, a turbomachine sparkplug, a device for radially securing the sparkplug to the turbomachine, which device comprises:
a sparkplug adapter fixed towards a first end to the outer casing, facing the second opening and through which adapter and casing the sparkplug in question passes and
a sparkplug guide kept in contact with the external longitudinal wall, facing the first opening and through which the sparkplug passes to emerge in the combustion chamber wherein:
the sparkplug and the sparkplug guide each have a screw thread, the screw threads being screwed together so as to stabilise the sparkplug radially to the axis of the combustion chamber, with respect to said external longitudinal wall and in this state, the sparkplug and sparkplug guide are installed freely in relation to the outer casing, in a direction substantially radial to the axis of the second opening.

2 . Assembly according to claim 1 , wherein the sparkplug guide is mounted in a recess located between the external longitudinal wall and the outer casing and that a substantially axial means of sliding, such as ball bearings, is interposed between the sparkplug guide and the respective wall of the annular boss of the external longitudinal wall.

3 . Assembly according to claim 1 , wherein the sparkplug adapter has, towards a second end opposite the first end, holes to allow passage of air between the inside and outside of the sparkplug adapter.

4 . Assembly according to claim 1 , wherein: in the sparkplug adapter, the sparkplug is equipped with a collar surrounding the latter locally and joined with at last one seal arranged in abutment between an inner edge of the sparkplug adapter and the collar.

5 . Assembly according to claim 4 , wherein the first and second deformable seals are arranged on either side of the collar, to ensure airtightness, on either side of said collar.

6 . Assembly according to claim 1 , wherein the sparkplug adapter features a first and a second part joined in order to be assembled together, for example by screw-fitting and disassembled in relation to one another substantially parallel to the axis of the second opening in the outer casing.

7 . Assembly according to claim 1 , wherein the sparkplug and sparkplug adapter are mutually equipped with centring systems comprising a bead around the sparkplug.

8 . Assembly according to claim 7 , wherein the centring systems comprise a spherical bearing around the sparkplug.

9 . Turbomachine comprising the assembly according to claim 1 , including the combustion chamber with the outer casing.

Assignees

• Snecma

Inventors

• Pireyre Pierre-Francois Simon Paul
• Leglaye Francois
• Stifanic David Gino

Classifications

• F02C3/14

  characterised by the arrangement of the combustion chamber in the plant (combustion chambers per se F23R; F02C3/205 takes precedence) · CPC title

• F23R3/002

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title

• F23R3/10

  for primary air (F23R3/06, F23R3/045 take precedence) · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F05D2240/35

  Combustors or associated equipment · CPC title