COMBUSTION PLATE

• US 20160116160A1
• Filed: 10/21/2015
• Published: 04/28/2016
• Est. Priority Date: 10/24/2014
• Status: Active Grant

• Current Assignee: Rinnai Corporation
• Original Assignee: Rinnai Corporation
• Inventors: Takeuchi, Masaru
• Granted Patent: US 9,841,187 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F23D 14/02 Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
• CPC Class Codes: F23D 14/145 combustion being stabilised at a screen or a perforated plate
• CPC Class Codes: F23D 14/74 Preventing flame lift-off
• CPC Class Codes: F23D 14/82 Preventing flashback or blowback
• CPC Class Codes: F23D 2203/005 Radiant burner heads
• CPC Class Codes: F23D 2203/1023 with specific free passage areas
• CPC Class Codes: F23D 2212/10 ceramic
• CPC Class Codes: F23D 2900/00003 Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Abstract

A combustion plate is for use in a totally aerated combustion burner in which a plate main body made of ceramic has formed therein a multiplicity of flame holes for ejecting a premixed gas. The plate main body is provided, in a lattice shape, with non-flame-hole sections free of flame holes. Each of those sections of the plate main body which are enclosed by the non-flame-hole sections constitutes a collective flame-hole section having formed therein in a crowded manner a plurality of flame holes. Flame holes formed in those peripheral portions of the collective flame-hole sections which are adjacent to the non-flame-hole sections are smaller in diameter than the diameter of the flame holes formed in those portions of the collective flame-hole sections which are inner than the peripheral portions.

Claims

1. A combustion plate for use in a totally aerated combustion burner in which a plate main body made of ceramic has formed therein a multiplicity of flame holes for ejecting a premixed gas,

wherein the plate main body is provided, in a lattice shape, with non-flame-hole sections free of flame holes, each of those sections of the plate main body which are enclosed by the non-flame-hole sections constituting a collective flame-hole section having formed therein in a crowded manner a plurality of flame holes,

characterized in that flame holes formed in those peripheral portions of the collective flame-hole sections which are adjacent to the non-flame-hole sections are smaller in diameter than the diameter of the flame holes formed in those portions of the collective flame-hole sections which are inner than the peripheral portions.

2. The combustion plate according to claim 1,

wherein flame holes are formed in each of those side portions of the non-flame-hole sections which are adjacent to the respective collective flame-hole sections, the flame holes being formed at a predetermined spacing from one another in a longitudinal direction of the non-flame-hole sections, and

wherein the predetermined spacing is set larger than the spacing from one another of the flame holes formed in the collective flame-hole sections as seen in a direction parallel to the longitudinal direction of the non-flame-hole sections.

3. The combustion plate according to claim 2, wherein the flame holes formed in each of the side portions of the non-flame-hole sections are also smaller in diameter than the diameter of those flame holes formed in those portions of the collective flame-hole sections which are inner than the peripheral portions.