GB2101734A - Pilot burner - Google Patents

Abstract

A pilot gas burner has a cylindrical body 1 with a gas inlet port 2 at one end, a jet 3 feeding air mixing chamber 4 with air inlet ports 5. The air/gas mixture passes through aperture 7 in baffle 6 into combustion chamber 8 having further air inlet ports 9 and an open end from which the flame emerges. <IMAGE>

Description

SPECIFICATION Improvements in or relating to gas burners This invention relates to an improvement in or relating to a gas burner and is primarily concerned with aburnerforthe production of a strong and stable pilot flame for the purpose of igniting a main industrial burner system.

It is one object of this invention to provide a burner wherein good mixing of air and gas occurs and wherein the unit comprises a small compact body which is easily maintained.

A further object is to provide a burner wherein the flame is comparable with that produced by a known and conventional pilot but which consumes less gas and which is less complex in construction.

According to this invention there is provided a gas burner comprising a generally cylindrical body unit with a gas inlet port at one end feeding a mixing chamber through a jet, the mixing chamber including peripheral ports through which air is drawn by the gas from the jet, the side of the mixing chamber opposite the jet including an apertured baffle plate communicating with a combustion chamber having an opposed open end from which the gas flame may issue, the combustion chamber including further peripheral ports. Preferably the jet is a seperate insert or an integral part of the cylindrical body and if seperate may conveniently comprise a stainless steel spud.With construction generally in accordance with the invention the gas flow from the jet is initially mixed with warm air through the whole body heating and the mixing process takes place within the combustion chamber and mixing chamber, thus obviating the risk of outside ignition.

By mixing gas with warm air in the mixing chamber and using a small orifice jet with low pressure gas the unit is made highly efficient resulting in considerable saving in gas consumed. It will be evident that the arrangement according to the invention requires few seperate parts and is simple to manufacture.

An embodiment according to the invention will now be described in conjunction with the accompanying drawing which shows a longitudinal sectional view through the pilot.

Referring to the drawing, the burner has a cylindrical body 1 which has tack welded thereto at one end a gas inlet having a port 2 and a centrally located jet orifice 3 formed by a seperate spud 4 mounted in the port. The jet 3 communicates with a mixing chamber 4 which is contained within the body and has a number of peripheral air inlet ports 5.

Gas issuing from jet 3 passes into mixing chamber 4 and draws in air through the ports 5. The mixing chamber is delimited by a baffle plate 6 incorporating a central aperture 7 through which the gas air mixture passes into a combustion chamber 8 of which the other end is open whereby the gas flame of some 12 to 18 inches in length protrudes. The length of this flame is dependent on the gas pressure. The combustion chamber 8 includes peripheral ports 9 through which further air is drawn. With this arrangement the burning gas heats the cylindrical body 1 thereby effecting a pre-warming on the air/gas mixture within chamber 4 to provide a more efficient combustion.

The spud 4 is screw threaded and includes a hexagonal key-way 10 enabling same to be removed and cleaned in a simple manner or replaced. The burner unit produces the same shape and strength of flame as a conventional pilot but uses much less gas and, furthermore, has fewer parts.

In modification the spud 4 may be replaced by a simple aperture in the port connecting part of the body unit.

When the pliot is used in a high draught burner a wind shield may be added to prevent flame lift off.

This addition stops pressure air rushing through the ports 5 and 7 resulting in flame failure.

1. A gas burner comprising a generally cylindrical body unit with a gas inlet port at one end feeding a mixing chamberthrough a jet, the mixing chamber including peripheral ports through which air is drawn by the gas from the jet, the side of the mixing chamber opposite the jet including an apertured baffle plate communicating with a combustion chamber having an opposed open end from which the gas flame may issue.

2. A gas burner in accordance with Claim 1, wherein the combustion chamber has peripheral ports.

3. A gas burner in accordance with Claim 1 or 2, wherein the jet is a seperate insert detachably mounted within the body.

4. A gas burner according to any preceding Claim, wherein a wind shield is provided around the body coaxial therewith and spaced therefrom.

5. A gas burner according to any preceding Claim, wherein the jet threadably engages the bore in one end of the body, the jet having a counterbored keyway for engagement with a tool to remove same.

6. A pilot gas burner as described herein and exemplified with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to gas burners This invention relates to an improvement in or relating to a gas burner and is primarily concerned with aburnerforthe production of a strong and stable pilot flame for the purpose of igniting a main industrial burner system. It is one object of this invention to provide a burner wherein good mixing of air and gas occurs and wherein the unit comprises a small compact body which is easily maintained. A further object is to provide a burner wherein the flame is comparable with that produced by a known and conventional pilot but which consumes less gas and which is less complex in construction. According to this invention there is provided a gas burner comprising a generally cylindrical body unit with a gas inlet port at one end feeding a mixing chamber through a jet, the mixing chamber including peripheral ports through which air is drawn by the gas from the jet, the side of the mixing chamber opposite the jet including an apertured baffle plate communicating with a combustion chamber having an opposed open end from which the gas flame may issue, the combustion chamber including further peripheral ports. Preferably the jet is a seperate insert or an integral part of the cylindrical body and if seperate may conveniently comprise a stainless steel spud.With construction generally in accordance with the invention the gas flow from the jet is initially mixed with warm air through the whole body heating and the mixing process takes place within the combustion chamber and mixing chamber, thus obviating the risk of outside ignition. By mixing gas with warm air in the mixing chamber and using a small orifice jet with low pressure gas the unit is made highly efficient resulting in considerable saving in gas consumed. It will be evident that the arrangement according to the invention requires few seperate parts and is simple to manufacture. An embodiment according to the invention will now be described in conjunction with the accompanying drawing which shows a longitudinal sectional view through the pilot. Referring to the drawing, the burner has a cylindrical body 1 which has tack welded thereto at one end a gas inlet having a port 2 and a centrally located jet orifice 3 formed by a seperate spud 4 mounted in the port. The jet 3 communicates with a mixing chamber 4 which is contained within the body and has a number of peripheral air inlet ports 5. Gas issuing from jet 3 passes into mixing chamber 4 and draws in air through the ports 5. The mixing chamber is delimited by a baffle plate 6 incorporating a central aperture 7 through which the gas air mixture passes into a combustion chamber 8 of which the other end is open whereby the gas flame of some 12 to 18 inches in length protrudes. The length of this flame is dependent on the gas pressure. The combustion chamber 8 includes peripheral ports 9 through which further air is drawn. With this arrangement the burning gas heats the cylindrical body 1 thereby effecting a pre-warming on the air/gas mixture within chamber 4 to provide a more efficient combustion. The spud 4 is screw threaded and includes a hexagonal key-way 10 enabling same to be removed and cleaned in a simple manner or replaced. The burner unit produces the same shape and strength of flame as a conventional pilot but uses much less gas and, furthermore, has fewer parts. In modification the spud 4 may be replaced by a simple aperture in the port connecting part of the body unit. When the pliot is used in a high draught burner a wind shield may be added to prevent flame lift off. This addition stops pressure air rushing through the ports 5 and 7 resulting in flame failure. CLAIMS

1. A gas burner comprising a generally cylindrical body unit with a gas inlet port at one end feeding a mixing chamberthrough a jet, the mixing chamber including peripheral ports through which air is drawn by the gas from the jet, the side of the mixing chamber opposite the jet including an apertured baffle plate communicating with a combustion chamber having an opposed open end from which the gas flame may issue.

2. A gas burner in accordance with Claim 1, wherein the combustion chamber has peripheral ports.

3. A gas burner in accordance with Claim 1 or 2, wherein the jet is a seperate insert detachably mounted within the body.

4. A gas burner according to any preceding Claim, wherein a wind shield is provided around the body coaxial therewith and spaced therefrom.

5. A gas burner according to any preceding Claim, wherein the jet threadably engages the bore in one end of the body, the jet having a counterbored keyway for engagement with a tool to remove same.

6. A pilot gas burner as described herein and exemplified with reference to the accompanying drawings.