Nozzle assembly for a combustion chamber of an engine, and burner seal

Abstract

A nozzle assembly for a combustion chamber of an engine has a nozzle for injecting fuel into a combustion space of the combustion chamber. The nozzle includes a main body, extending along a nozzle longitudinal axis, a nozzle head, and a nozzle bracket, connected to the main body and having a fuel feed line. The main body includes a central fuel pipe, extending along the longitudinal axis and a fuel outlet opening, and at the nozzle head, at least one air-guiding duct, spaced apart radially from the fuel pipe, with an air outlet opening. The nozzle assembly has a burner seal for sealing with respect to a combustion chamber head, the burner seal formed separately from the main body. The air-guiding duct is formed in the burner seal.

1 . A nozzle assembly for a combustion chamber of an engine, having at least one nozzle for injecting fuel into a combustion space of the combustion chamber, wherein the nozzle comprises a nozzle main body, which extends along a nozzle longitudinal axis and has a nozzle head, and a nozzle bracket, which is connected to the nozzle main body and has at least one fuel feed line,
 wherein the nozzle main body comprises a central fuel pipe, which extends along the nozzle longitudinal axis and has a fuel outlet opening, and at the nozzle head there is at least one air-guiding duct, spaced apart radially from the fuel pipe, with an air outlet opening,   characterized in that the nozzle assembly has a burner seal for providing sealing with respect to a combustion chamber head, said burner seal being formed and arranged spatially separately from the nozzle main body, wherein the at least one air-guiding duct is formed and arranged, preferably only, in the burner seal.   
     
     
         2 . The nozzle assembly according to  claim 1 , wherein there are at least two air-guiding ducts that are spaced apart radially from one another, wherein at least a radially outer air-guiding duct is formed and arranged entirely and/or at least a radially inner air-guiding duct is formed and arranged at least partially in the burner seal. 
     
     
         3 . The nozzle assembly according to  claim 1 , wherein a swirl element for swirl generation is arranged in the burner seal, in the at least one air-guiding duct, preferably in the radially outer air-guiding duct, and/or at least one guide vane for targeted flow guidance and/or swirl generation in an air flow flowing through it is arranged preferably in the radially inner air-guiding duct. 
     
     
         4 . The nozzle assembly according to  claim 2 , wherein the narrowest flow cross section of the radially outer air-guiding duct is designed to be larger, preferably by at least a factor of 2, than the narrowest flow cross section of the radially inner air-guiding duct. 
     
     
         5 . The nozzle assembly according to  claim 1 , wherein the at least one or at least one of the air outlet opening(s), in particular the radially outer air outlet opening, is arranged in an axially set-back manner with respect to the fuel outlet opening, and/or
 in that when there are a plurality of air-guiding ducts, the air outlet opening of the radially inner air-guiding duct and/or of the radially outer air-guiding duct is arranged axially at the level of the fuel outlet opening.   
     
     
         6 . The nozzle assembly according to  claim 1 , wherein the nozzle main body and the burner seal are in contact in an axially movable manner with respect to one another by means of at least one contact element, wherein
 the at least one contact element is in the form of a, preferably entirely circumferential, contact ring and is fastened to the nozzle main body or to the burner seal and/or is integrated integrally in same, and/or   the at least one contact element is formed from the at least one guide vane or comprises same, which is formed at the same time as a spacer element.   
     
     
         7 . The nozzle assembly according to  claim 6 , wherein the at least one contact element has a bevel and/or a rounded portion at least at one, for example its upstream, axial end. 
     
     
         8 . The nozzle assembly according to  claim 6 , wherein the at least one contact element, in particular the contact ring, is formed, on the radial side in contact with the other component, nozzle main body or burner seal, so as to have a curved axial profile, in particular to form a bulging sealing surface, and/or
 in that the at least one contact element, preferably the contact ring, comprises, at its upstream end, a collar which is open radially towards the outside at an angle, wherein preferably the collar is arranged axially upstream of an inlet opening of the at least one air-guiding duct, in particular of the radially inner air-guiding duct.   
     
     
         9 . The nozzle assembly according to any of  claim 6 , characterized in that the contact ring and/or a radially inner ring of the burner seal is arranged in an axially set-back manner with respect to the air outlet opening of the at least one, preferably of the inner, air-guiding duct, wherein the radially inner side of the air-guiding duct is formed in an upstream portion by the contact ring and/or the inner ring and in a downstream portion by the fuel pipe, in particular a fuel-pipe wall, of the nozzle main body. 
     
     
         10 . The nozzle assembly according to  claim 1 , wherein the fuel pipe has a bevel at its downstream end. 
     
     
         11 . The nozzle assembly according to  claim 9 , wherein the at least one guide vane is arranged in the upstream portion. 
     
     
         12 . The nozzle assembly according to  claim 1 , wherein at least one cooling duct, extending for example at least partially parallel to or coaxially with the nozzle longitudinal axis, is arranged in the burner seal, preferably in a radially outer ring, said cooling channel surrounding in particular the, possibly outer, air-guiding duct in a manner radially spaced apart therefrom, wherein in particular a downstream portion of the at least one cooling channel, leading into the combustion chamber, is oriented towards the outside with, preferably only, a radial directional component. 
     
     
         13 . The nozzle assembly according to  claim 1 , wherein at least a part of a securing arrangement for securing the burner seal is present in a tangential and/or axial direction, for example on a structure surrounding the burner seal, wherein
 the securing arrangement comprises a thickened portion on a radially externally circumferential fastening collar of the burner seal, for projecting into a corresponding recess in a structure radially externally surrounding the burner seal, and/or   the securing arrangement is formed between the nozzle main body and the burner seal, wherein a partially circumferential clearance, extending for example over an angular range of between 15° and 120°, preferably 45° and 110°, in particular 100°, is arranged at the upstream end of the contact ring and/or inner ring, and the nozzle main body has, on the outer side of the fuel pipe, a radial thickened portion which projects into the partially circumferential clearance, wherein in particular the radial thickened portion exhibits at most half, preferably at most a quarter, of the circumferential extent of the partially circumferential clearance.   
     
     
         14 . The nozzle assembly according to  claim 1 , wherein at least one central flow body is arranged in the fuel pipe, and at the outer lateral surface of said flow body, fuel fed by means of the fuel pipe can flow in the direction of the fuel outlet opening, via which fuel is able to be introduced into the combustion space. 
     
     
         15 . A burner seal which is designed to be used in a nozzle assembly according to  claim 1 , wherein at least one air-guiding duct for guiding combustion air in a combustion space is integrated into the burner seal.