Pilot valve assembly for a switch heater

Claim 2

A pilot burner assembly for a switch heater to produce a pilot flame for lighting a main burner, the assembly including a burner connected to a fuel source at one end and having a nozzle at the other end, the improvement in a shield and deflector unit mounted on the nozzle, said unit including a rectangular in cross-section tubular shield portion wrapped around the burner and extending from the nozzle end, said nozzle end of the burner being circular in cross-section, the outer end of the shield portion terminating in a flame discharge opening, and a deflector portion extending over the flame discharge opening coacting with the shield portion to aid flame retention and prevent blowout.

Claim 3

The combination as defined in claim 1, and flame retention holes in said nozzle adjacent the terminal end thereof providing combustion air to the fLame.

Claim 4

A pilot burner assembly for a switch heater to produce a pilot flame for lighting a main burner, the assembly including a burner connected to a fuel source at one end and having a nozzle at the other end, the improvement in a shield and deflector unit mounted on the nozzle, said unit including a tubular shield portion wrapped around the burner and extending from the nozzle end, the outer end of the shield portion terminating in a flame discharge opening, and a deflector portion extending over and covering about one-third of the flame discharge opening coacting with the shield portion to aid flame retention and prevent blowout.

Claim 5

A pilot burner assembly for a switch heater to produce a pilot flame for lighting a main burner, the assembly including a burner connected to a fuel source at one end and having a nozzle at the other end, the improvement in a shield and deflector unit mounted on the nozzle, said unit including a tubular shield portion wrapped around the burner and extending from the nozzle end, the outer end of the shield portion terminating in a flame discharge opening, and a deflector portion extending over and covering about one-third of the flame discharge opening coacting with the shield portion to aid flame retention and prevent blowout.

Claim 6

The combination as defined in claim 3, wherein the shield cross section is sized so that the flame exit area at the flame discharge opening is about equal to the flame exit area at the nozzle end of the burner.

Claim 7

In a switch heater, a single jet burner including an elongated horizontally extending burner tube, a single jet fuel nozzle at one end of the tube, and an opening extending upwardly through the tube adjacent the fuel nozzle, the improvement in a pilot burner assembly for producing a pilot flame in said opening, said assembly comprising a burner connected to a fuel source at one end and having a nozzle at the other end, and a shield and deflector unit mounted on the nozzle, said unit including a tubular shield portion wrapped around the burner and extending from the nozzle end and terminating in a flame discharge opening in the proximity of the burner tube opening, the nozzle end of the burner being circular in cross section and the shield portion being square in cross section, flame retention holes in circumferentially spaced relation at the discharge end of the nozzle within the shield portion and providing combustion air to the nozzle, channels defined between the shield portion and nozzle to permit air to travel to the flame retention holes and the discharge end of the nozzle, and a deflector portion extending over the flame discharge opening of the shield portion.

Claim 8

In a switch heater, a single jet burner including an elongated horizontally extending burner tube, a single jet fuel nozzle at one end of the tube, and an opening extending upwardly through the tube adjacent the fuel nozzle, the improvement in a pilot burner assembly for producing a pilot flame in said opening, said assembly comprising a burner connected to a fuel source at one end and having a nozzle at the other end, and a shield and deflector unit mounted on the nozzle, said unit including a tubular shield portion wrapped around the burner and extending from the nozzle end and terminating in a flame discharge opening in the proximity of the burner tube opening, the nozzle end of the burner being circular in cross section and the shield portion being square in cross section, flame retention holes in circumferentially spaced relation at the discharge end of the nozzle within the shield portion and providing combustion air to the nozzle, channels defined between the shield portion and nozzle to permit air to travel to the flame retention holes and the discharge end of the nozzle, and a deflector portion extending over the flame discharge opening of the shield portion.

Claim 9

The combination as defined in claim 5, wherein the deflector portion is sized to cover about one-third the area of the flame discharge opening.

Claim 10

In a switch heater, a double jet burner including an elongated horizontally extending burner tube, a double jet fuel nozzle centrally of the tube for discharging fuel in opposite directions, the jets being coaxial with the tube, the improvement in a pilot burner assembly extending vertically and producing a pilot flame adjacent the double jet fuel nozzle, said assembly comprising a burner connected to a fuel source at one end and having a nozzle at the other end, and a shield and deflector unit mounted on the nozzle, said unit including a tubular shield portion wrapped around the burner and extending from the nozzle end and terminating in a flame discharge opening adjacent the double jet fuel nozzle, the nozzle end of the burner being circular in cross section and the shield portion being square in cross section, flame retention holes in circumferentially spaced relation at the discharge end of the nozzle within the shield portion and providing combustion air to the nozzle, channels defined between the shield portion and nozzle to permit air to travel to the flame retention holes and the discharge end of the nozzle, and a deflector portion extending over the flame discharge opening of the shield portion.

Claim 11

In a switch heater, a double jet burner including an elongated horizontally extending burner tube, a double jet fuel nozzle centrally of the tube for discharging fuel in opposite directions, the jets being coaxial with the tube, the improvement in a pilot burner assembly extending vertically and producing a pilot flame adjacent the double jet fuel nozzle, said assembly comprising a burner connected to a fuel source at one end and having a nozzle at the other end, and a shield and deflector unit mounted on the nozzle, said unit including a tubular shield portion wrapped around the burner and extending from the nozzle end and terminating in a flame discharge opening adjacent the double jet fuel nozzle, the nozzle end of the burner being circular in cross section and the shield portion being square in cross section, flame retention holes in circumferentially spaced relation at the discharge end of the nozzle within the shield portion and providing combustion air to the nozzle, channels defined between the shield portion and nozzle to permit air to travel to the flame retention holes and the discharge end of the nozzle, and a deflector portion extending over the flame discharge opening of the shield portion.

Claim 12

The combination defined in claim 7, wherein the deflector portion is sized and positioned to split the flame and ignite the fuel from each jet of the nozzle.

Claim 13

The combination as defined in claim 8, and ignition scoops and channels in said burner tube reducing the velocity of a small part of the fuel discharge adjacent the pilot burner flame to enable ignition.