Housing of a gasket for a turbomachine injector

Patent metadata

Field	Value
Publication number	US-10995671-B2
Application number	US-201716304406-A
Country	US
Kind code	B2
Filing date	May 29, 2017
Priority date	May 31, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

An inlet body is for a fluid injector for a turbomachine. The inlet body includes a casing and an inlet nozzle, housed inside the casing, that serves as a seat for a mobile sealing member. The inlet nozzle includes a central duct for the fluid and an annular rim surrounding the central duct. The annular rim includes a housing for a gasket. The housing is defined by a bottom wall, an opening opposite the bottom wall, and two opposite walls which each extend between the bottom wall and the opening. The walls are tilted towards each other in the direction of the opening.

First claim

The invention claimed is:

1. A fuel injector for a turbomachine, the fuel injector comprising, from upstream to downstream:
a sealing valve;
a diaphragm; and
a metering device,
wherein the fuel injector further comprises from upstream to downstream an inlet body, a central body into which the inlet body leads, a fixing plate for fixing the fuel injector to a wall of a combustion chamber, an injection unit, and an injector nose located near a distal end of the injection unit,
wherein the fuel injector further comprises an external casing delimiting the fuel injector towards an outside of the fuel injector,
wherein the inlet body houses the sealing valve inside the external casing,
wherein the sealing valve comprises a stopper, a spring, and an inlet nozzle,
wherein the spring stresses the stopper towards a closed position of the stopper,
wherein the inlet nozzle is a seat for the stopper,
wherein the stopper comprises a body, an inner pipe on an inside of the body, and admission pipes which lead into the inner pipe through the body of the stopper,
wherein the body of the stopper comprises an annular wall, a base wall, and an annular contact edge,
wherein the base wall closes the stopper upstream, and the base wall is surrounded by the contact edge,
wherein the contact edge contacts a gasket when the stopper is in the closed position,
wherein each admission pipe is a channel which extends between an intermediate space and the inner pipe,
wherein the admission pipes are distributed at angles through the body of the stopper,
wherein the admission pipes are each inclined downstream in relation to a longitudinal direction of the inlet body,
wherein the intermediate space is delimited radially to an exterior by an internal surface of the external casing,
wherein the intermediate space is delimited radially to an interior by the stopper in the closed position of the stopper,
wherein the intermediate space connects fluidically the inlet nozzle to the stopper in an open position of the stopper,
wherein the intermediate space has no fluid communication with the inlet nozzle in the closed position of the stopper,
wherein the inlet nozzle comprises an annular body which is traversed at two opposite ends thereof in an axial direction by an inlet and an outlet, and a central pipe which extends from the inlet to the outlet in the longitudinal direction of the inlet body,
wherein the inlet of the inlet nozzle leads to the exterior of the fuel injector,
wherein the annular body of the inlet nozzle comprises an annular rim which surrounds the central pipe and which delimits a housing for accommodating the gasket,
wherein the housing is delimited by a base wall, an opening opposite the base wall, and two opposite walls which each extend between the base wall and the opening,
wherein the gasket is crimped into the housing by the two opposite walls which are inclined towards one another in the direction of the opening,
wherein the two opposite walls are spaced apart by a distance which is equal to at most 70% of a maximum diameter of the gasket in a radial direction in longitudinal cross-section of the inlet body, to close the housing,
wherein the annular rim comprises an evacuation pipe opening into the housing and to the exterior of the inlet nozzle,
wherein the evacuation pipe is configured to evacuate fluid out of the housing,
wherein at least a portion of the evacuation pipe extends in a direction parallel to the longitudinal direction of the inlet body,
wherein the portion of the evacuation pipe is formed by a groove arranged on a radially outwardly facing external surface of the inlet nozzle, and
wherein the groove faces the internal surface of the external casing.

2. The fuel injector according to claim 1 ,
wherein an external wall of the two opposite walls is inclined at an angle between 15° and 25° relative to the longitudinal direction.

3. The fuel injector according to claim 1 , wherein the housing has a substantially trapezoidal form in longitudinal cross-section of the inlet body, and wherein the opening is positioned substantially parallel to the base wall of the housing.

4. The fuel injector according to claim 1 , wherein the evacuation pipe traverses an external edge of the annular rim.

5. A method for production of a fuel injector for a turbomachine,
the fuel injector comprising, from upstream to downstream:
a sealing valve;
a diaphragm; and
a metering device,
wherein the fuel injector further comprises from upstream to downstream an inlet body, a central body into which the inlet body leads, a fixing plate for fixing the fuel injector to a wall of a combustion chamber, an injection unit, and an injector nose located near a distal end of the injection unit,
wherein the fuel injector further comprises an external casing delimiting the fuel injector towards an outside of the fuel injector,
wherein the inlet body houses the sealing valve inside the external casing,
wherein the sealing valve comprises a stopper, a spring, and an inlet nozzle,
wherein the spring stresses the stopper towards a closed position of the stopper,
wherein the inlet nozzle is a seat for the stopper,
wherein the stopper comprises a body, an inner pipe on an inside of the body, and admission pipes which lead into the inner pipe through the body of the stopper,
wherein the body of the stopper comprises an annular wall, a base wall, and an annular contact edge,
wherein the base wall closes the stopper upstream, and the base wall is surrounded by the contact edge,
wherein the contact edge contacts a gasket when the stopper is in the closed position,
wherein each admission pipe is a channel which extends between an intermediate space and the inner pipe,
wherein the admission pipes are distributed at angles through the body of the stopper,
wherein the admission pipes are each inclined downstream in relation to a longitudinal direction of the inlet body,
wherein the intermediate space is delimited radially to an exterior by an internal surface of the external casing,
wherein the intermediate space is delimited radially to an interior by the stopper in the closed position of the stopper,
wherein the intermediate space connects fluidically the inlet nozzle to the stopper in an open position of the stopper,
wherein the intermediate space has no fluid communication with the inlet nozzle in the closed position of the stopper,
wherein the inlet nozzle comprises an annular body which is traversed at two opposite ends thereof in an axial direction by an inlet and an outlet, and a central pipe which extends from the inlet to the outlet in the longitudinal direction of the inlet body,
wherein the inlet of the inlet nozzle leads to the exterior of the fuel injector,
wherein the annular body of the inlet nozzle comprises an annular rim which surrounds the central pipe and which delimits a housing for accommodating the gasket,
wherein the housing is delimited by a base wall, an opening opposite the base wall, and two opposite walls which each extend between the base wall and the opening,
wherein the gasket is crimped into the housing by the two opposite walls which are inclined towards one another in the direction of the opening,
wherein the two opposite walls are spaced apart by a distance which is equal to at most 70% of a maximum diameter of the gasket in a radial direction in longitudinal cross-section of the inlet body, to close the housing,
wherein the annular rim comprises an evacuation pipe opening into the housing and to the exterior of the inlet nozzle,
wherein the evacuation pipe is configured to evacuate fluid out of the housing,
wherein at least a portion of the evacuation pipe extends in a direction parallel to the longitudinal direction of the inlet body,
wherein the

Assignees

• Safran Aircraft Engines

Inventors

• Chabaille Christophe
• Bissieres Antoine
• Mottet Lauranne Sophie

Classifications

• F02C9/263

  by means of fuel metering valves · CPC title

• F16J15/32

  with elastic sealings, e.g. O-rings · CPC title

• F23R2900/00012

  Details of sealing devices · CPC title

• F23N2235/24

  Valve details · CPC title

• F05D2240/35

  Combustors or associated equipment · CPC title