# US 12,601,478 B2 · Combustion apparatus

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- Number: US 12,601,478 B2
- Document ID: US12601478B2
- Status: Granted
- Kind: B2
- Application number: 18/340,307
- Filed: 2023-06-23
- Published: 2024-02-22
- Granted: 2026-04-14
- Earliest claimed: 2022-08-22
- Assignees: Rinnai Corporation
- Applicants: Rinnai Corporation
- Inventors: Yusuke Shiraha; Masaru Takeuchi
- Web page: https://patentgrep.com/patent/US12601478B2

## CPC

- F23D 14/70: Baffles or like flow-disturbing devices
- F23D 14/02: Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D 14/46: Details
- F23D: BURNERS

## Abstract

In a combustion apparatus that includes a burner constituted by a burner body, an inside of which an air-fuel mixture is supplied to and one surface of which is made into an open surface, and a combustion plate covering the open surface of the burner body, and a combustion box enclosing a combustion space of the air-fuel mixture ejecting from the combustion plate, an offset part that is positioned at a portion which is away from the swelling part in an inflow direction of the air-fuel mixture to the inner chamber and does not oppose to a tip part(s) of the ignition electrode(s) through the combustion plate is provided with the opposite wall of the burner body and the offset part offsets to a combustion-plate side so that a distance between the offset part and the combustion plate becomes shorter than that between the combustion plate and a general part of the opposite wall except the swelling part and the offset part.

## Claims

### Claim 1

A combustion apparatus comprising,
a burner constituted by a burner body an inside of which an air-fuel mixture is supplied to and one surface of which is made into an open surface, and a combustion plate covering the open surface of the burner body; and
a combustion box enclosing a combustion space of the air-fuel mixture ejecting from the combustion plate,
wherein an ignition electrode(s) faced to the combustion plate is mounted on a predetermined side plate of the combustion box and a swelling part, an inside of which becomes an inflow chamber of the air-fuel mixture and which swells in a direction away from the combustion plate, is provided with a part of an opposite wall of the burner body, which opposes to the combustion plate at a distance, and
wherein on a premise that a direction from the predetermined side plate of the combustion box to a side plate, opposite to the predetermined side plate, of the combustion box is a predetermined direction, the air-fuel mixture is configured to flow in the inflow chamber with a direction component to the predetermined direction,
wherein:
an offset part that is positioned at a portion which is away from the swelling part in an inflow direction of the air-fuel mixture to the inflow chamber and does not oppose to a tip part(s) of the ignition electrode(s) through the combustion plate is provided with the opposite wall of the burner wall and the offset part offsets to a combustion-plate side so that a distance between the offset part and the combustion plate is shorter than that between the combustion plate and a general part of the opposite wall except the swelling part and the offset part.

### Claim 2 (depends on 1)

The combustion apparatus as claimed in claim 1, wherein an inclining part, which is positioned between the swelling part and the offset part and a distance from the combustion plate of which continuously decreases toward the offset part, is provided with the opposite wall.