Rich-lean burner

Patent metadata

Field	Value
Publication number	US-9933155-B2
Application number	US-201514693164-A
Country	US
Kind code	B2
Filing date	Apr 22, 2015
Priority date	Apr 22, 2015
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A rich-lean burner has on an upper end portion thereof: a lean flame port longitudinally extended to eject a lean fuel-air mixture which is leaner in fuel concentration than a theoretical fuel-air ratio; a blind clearance located on each lateral side of the lean flame port, the blind clearance being free from ejection of a fuel-air mixture; and a rich flame port located on lateral outside of each of the blind clearances to eject a rich fuel-air mixture which is richer in fuel concentration than the theoretical fuel-air ratio. The rich-lean burner further has a lean-flame deforming device to deform a lean flame formed by combustion of the lean fuel-air mixture ejected from the lean flame port such that the shape of one lateral side of the lean flame becomes asymmetrical with the shape of laterally opposite side of the lean flame.

First claim

What is claimed is:

1. A rich-lean burner comprising on an upper end portion thereof: a lean flame port longitudinally extended to eject a lean fuel-air mixture which is leaner in fuel concentration than a theoretical fuel-air ratio; a blind clearance located on each lateral side of the lean flame port, the blind clearance being free from ejection of a fuel-air mixture; and a rich flame port located on lateral outside of each of the blind clearances to eject a rich fuel-air mixture which is richer in fuel concentration than the theoretical fuel-air ratio,
wherein the rich-lean burner further comprises a lean-flame deforming means to deform a lean flame formed by combustion of the lean fuel-air mixture ejected from the lean flame port such that the shape of one lateral side of the lean flame becomes asymmetrical with the shape of laterally opposite side of the lean flame;
wherein the lean-flame deforming means is arranged such that an upper end of a plate to partition the blind clearance on one lateral side of the lean flame port and the rich flame port on lateral outside of blind clearance is different in height from an upper end of a plate to partition the blind clearance on the laterally opposite side of the lean flame port and the rich flame port on the lateral outside of the blind clearance; and
wherein the lean-flame deforming means is arranged such: that the lean flame port is divided into a plurality of longitudinally disposed blocks; and that the shape of one lateral side of the lean flame formed by the combustion of lean fuel-air mixture ejected from the block of even-numbered lean flame ports as counted from a front end is symmetrical with the shape of the laterally opposite side of the lean flame formed by the combustion of lean fuel-air mixture ejected from the block of odd-numbered lean flame ports as counted from the front end.

Assignees

• Rinnai Kk

Inventors

• Ojiro Takashi

Classifications

• F23D99/002

  Burners specially adapted for specific applications · CPC title

• Y02E20/344

  Cross-Sectional Technologies · mapped topic

• F23D23/00

  Assemblies of two or more burners (gas burners with provision for a retention flame F23D14/26) · CPC title

• F23D91/00

  Mechanical Engineering · mapped topic

• F23C2201/20

  Burner staging · CPC title