Fuel injector and gas turbine

Abstract

A fuel injector includes a premix tube, a fuel introduction unit, and a downstream side plate. The premix tube includes a tube body and a guide part. In the tube body, a through-hole which allows communication between an internal space and an external space is formed at an upstream side end part on a side close to the inlet port. The guide part extends from an end part of the through-hole in a circumferential direction centered on an axis of the premix tube to intersect both the circumferential direction and an axial direction in which the axis extends.

What is claimed is: 
     
         1 . A fuel injector, comprising:
 a premix tube which introduces air from an inlet port into an internal space and discharges an air-fuel mixture in which the air and fuel are mixed from a discharge port;   a fuel introduction unit which introduces fuel into the internal space; and   a downstream side plate through which an end part on the discharge port side of the premix tube penetrates and which supports the end part on a downstream side of the premix tube; wherein   the premix tube includes:   a tube body in which a through-hole which allows communication between the internal space and an external space is formed at an upstream side end part on a side close to the inlet port; and   a guide part which extends from an end part of the through-hole in a circumferential direction centered on an axis of the premix tube to intersect both the circumferential direction and an axial direction in which the axis extends.   
     
     
         2 . The fuel injector according to  claim 1 , wherein the guide part includes an inner guide part extending from a first end part of the through-hole in the circumferential direction toward an inner side of the inlet port and toward a side close to a second end part of the through-hole. 
     
     
         3 . The fuel injector according to  claim 1 , wherein the guide part includes an outer guide part extending from a second end part of the through-hole in the circumferential direction toward an outer side of the inlet port and toward a side close to a first end part of the through-hole. 
     
     
         4 . The fuel injector according to  claim 1 , wherein a plurality of guide parts and through-holes are provided at intervals in the circumferential direction of the inlet port. 
     
     
         5 . The fuel injector according to  claim 1 , wherein the fuel introduction unit includes a nozzle inserted into the internal space from the inlet port and configured to inject fuel from a distal end part thereof. 
     
     
         6 . The fuel injector according to  claim 1 , wherein the fuel introduction unit includes:
 the downstream side plate;   an upstream side plate disposed closer to the inlet port than to the downstream side plate, having an upstream side through-hole through which the premix tube passes, and configured to form a plenum between the upstream side plate, an outer wall of the premix tube, and the downstream side plate;   a fuel supply pipe which supplies fuel to the plenum; and   a fuel through-hole formation part forming a portion of the outer wall of the premix tube and forming a fuel through-hole penetrating through the outer wall of the premix tube.   
     
     
         7 . A gas turbine comprising the fuel injector according to  claim 1 . 
     
     
         8 . The fuel injector according to  claim 2 , wherein the guide part includes an outer guide part extending from a second end part of the through-hole in the circumferential direction toward an outer side of the inlet port and toward a side close to a first end part of the through-hole. 
     
     
         9 . The fuel injector according to  claim 2 , wherein a plurality of guide parts and through-holes are provided at intervals in the circumferential direction of the inlet port. 
     
     
         10 . The fuel injector according to  claim 3 , wherein a plurality of guide parts and through-holes are provided at intervals in the circumferential direction of the inlet port. 
     
     
         11 . The fuel injector according to  claim 2 , wherein the fuel introduction unit includes a nozzle inserted into the internal space from the inlet port and configured to inject fuel from a distal end part thereof. 
     
     
         12 . The fuel injector according to  claim 3 , wherein the fuel introduction unit includes a nozzle inserted into the internal space from the inlet port and configured to inject fuel from a distal end part thereof. 
     
     
         13 . The fuel injector according to  claim 4 , wherein the fuel introduction unit includes a nozzle inserted into the internal space from the inlet port and configured to inject fuel from a distal end part thereof. 
     
     
         14 . The fuel injector according to  claim 2 , wherein the fuel introduction unit includes:
 the downstream side plate;   an upstream side plate disposed closer to the inlet port than to the downstream side plate, having an upstream side through-hole through which the premix tube passes, and configured to form a plenum between the upstream side plate, an outer wall of the premix tube, and the downstream side plate;   a fuel supply pipe which supplies fuel to the plenum; and   a fuel through-hole formation part forming a portion of the outer wall of the premix tube and forming a fuel through-hole penetrating through the outer wall of the premix tube.   
     
     
         15 . The fuel injector according to  claim 3 , wherein the fuel introduction unit includes:
 the downstream side plate;   an upstream side plate disposed closer to the inlet port than to the downstream side plate, having an upstream side through-hole through which the premix tube passes, and configured to form a plenum between the upstream side plate, an outer wall of the premix tube, and the downstream side plate;   a fuel supply pipe which supplies fuel to the plenum; and   a fuel through-hole formation part forming a portion of the outer wall of the premix tube and forming a fuel through-hole penetrating through the outer wall of the premix tube.   
     
     
         16 . The fuel injector according to  claim 4 , wherein the fuel introduction unit includes:
 the downstream side plate;   an upstream side plate disposed closer to the inlet port than to the downstream side plate, having an upstream side through-hole through which the premix tube passes, and configured to form a plenum between the upstream side plate, an outer wall of the premix tube, and the downstream side plate;   a fuel supply pipe which supplies fuel to the plenum; and   a fuel through-hole formation part forming a portion of the outer wall of the premix tube and forming a fuel through-hole penetrating through the outer wall of the premix tube.   
     
     
         17 . A gas turbine comprising the fuel injector according to  claim 2 . 
     
     
         18 . A gas turbine comprising the fuel injector according to  claim 3 . 
     
     
         19 . A gas turbine comprising the fuel injector according to  claim 4 . 
     
     
         20 . A gas turbine comprising the fuel injector according to  claim 5 .