Patent ID: 9091436
Filing Date: 2015-07-28
Classification: F23C,F23D

Abstract:
1. A rich-lean burner comprising: a lean-flame port from which a lean gas that is a lean mixture of a gas and air is to be supplied for combustion; a rich-flame port from which a rich mixture of the gas and air is to be supplied for combustion, and which is disposed outwardly adjacent to the lean-flame port with a gap that vertically extends from a lower portion to an upper portion of the burner and having an opening of the gap being interposed between the lean-flame port and the rich-flame port; a first partition plate disposed between the gap and the lean-flame port; a second partition plate disposed between the gap and the rich-flame port; and a plurality of projections provided on at least one of the first and second partition plates, each of the projections protruding from one of the first and second partition plates with a distal end thereof being in contact with the other of the first and second partition plates to form the opening of the gap having a predetermined size therebetween, wherein the gap is in fluid communication with a gas supply passage at the lower portion of the burner through which the lean gas is to be supplied to the lean-flame port, and wherein a recessed portion is formed at an interface region between the distal ends of the plurality of projections and the other of the first and second partition plates adjacent to the lean-flame port, the recessed portion being configured such that in the interface region the plurality of projections are partially not in contact with the other of the first and second partition plates to form a reduced and predetermined clearance between the distal ends of the plurality of projections and the other of the first and second partition plates in the gap that vertically extends from the gas supply passage at the lower portion of the burner to the upper portion of the burner, such that the entire reduced amount of the lean gas is supplied through the predetermined clearance to the opening of the gap.