# US 4,400,156 A · Gas burner

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- Number: US 4,400,156 A
- Document ID: US4400156A
- Status: Granted
- Kind: A
- Application number: 06/322,236
- Filed: 1981-11-17
- Granted: 1983-08-23
- Earliest claimed: 1980-12-03
- Assignees: Febrag AG Watt
- Inventors: Markus Frey
- Web page: https://patentgrep.com/patent/US4400156A

## CPC

- F23D 14/82: Preventing flashback or blowback
- F23D 14/62: Mixing devices; Mixing tubes
- F24H 3/065: {using fluid fuel}
- F23D: BURNERS
- F24H: FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL (steam generation F22)

## Abstract

In a gas burner arrangement which has at least one burner, and a mixing chamber for mixing entering air and fuel, includes, in combination, a conduit which establishes intercommunication between the mixing chamber and the burner, an expansion chamber communicating with the mixing chamber, and a burner channel communicating with the expansion chamber and the burner, respectively, so that air and fuel entering the mixing chamber will be intermixed and the resulting mixture will proceed therefrom through the expansion chamber and subsequently through the burner channel to the burner.

## Claims

### Claim 1

In a gas burner arrangement having at least one burner, and a mixing chamber for mixing entering air and fuel,
in combination
means establishing a conduit between said mixing chamber and said burner, said conduit including an expansion chamber downstream of and communicating with said mixing chamber, and said conduit including a burner channel downstream of and communicating with said expansion chamber and with said burner, respectively,
whereby air and fuel entering said mixing chamber will be intermixed, and the resulting mixture will proceed therefrom through said conduit to the burner,
wherein said burner channel has an open end, said conduit further comprising a delivery passage establishing the communication between said mixing chamber and said expansion chamber, and said conduit including an intermediate passage establishing the communication between said expansion chamber and said burner channel, whereby the conduit will supply said mixture to a flame developed at the open end of said burner channel,
wherein each of said passages has a predetermined cross-section, the cross-section of each passage being sized so that a selected fuel mixture will have an operative velocity of the fuel mixture throughout the conduit which exceeds its ignition velocity therein.

### Claim 2 (depends on 1)

In a gas burner arrangement as claimed in claim 1, wherein said intermediate passage terminates substantially tangentially to said burner channel.

### Claim 3 (depends on 1)

In a gas burner arrangement as claimed in claim 1, wherein the conduit generates an operative velocity in each passage in the range of from about 150 feet per second to about 600 feet per second.

### Claim 4 (depends on 3)

In a gas burner arrangement as claimed in claim 3, wherein the operative velocity is in the range of from about 240 feet per second to about 450 feet per second.

### Claim 5 (depends on 2)

In a gas burner arrangement as claimed in claim 2, wherein said burner channel and said intermediate passage communicating therewith are so proportioned that a vortex arises when the fuel mixture passes through said burner channel to feed the flame.

### Claim 6 (depends on 1)

In a gas burner arranged as claimed in claim 1, a second burner, said conduit further comprising a second burner channel establishing communication with said expansion chamber and said second burner.

### Claim 7 (depends on 1)

A heat exchanger using a gas burner arrangement as claimed in claim 1, for generating hot air, further comprising a housing accommodating said gas burner arrangement, and wherein air to be warmed entering said housing streams past said gas burner arrangement, and receives heat therefrom.

### Claim 8 (depends on 7)

A heat exchanger as claimed in claim 7, wherein said gas burner arrangement is cooled and insulated by the air entering through said housing and streaming past said gas burner arrangement.

### Claim 9 (depends on 7)

A heat exchanger as claimed in claim 7, wherein the air leaving said heat exchanger is flame-heated by said gas burner arrangement.