Burner

Patent metadata

Field	Value
Publication number	US-10316715-B2
Application number	US-201615160673-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 27, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The burner includes a first tube portion having a tube end including an ejection port and a second tube portion extending toward the ejection port in the first tube portion. The combustion gas generated by combusting air-fuel mixture is ejected from the ejection port. The second tube portion includes a heat exchanging portion that vaporizes liquid fuel with combustion heat of the combustion chamber and supplies the vaporized fuel to the premixing chamber. The outer surface of the second tube portion functions as a heat receiving surface of the heat exchanging portion. A fuel supply section of the burner is configured to vaporize liquid fuel and supply the vaporized fuel to the premixing chamber, and supply liquid fuel to the heat exchanging portion.

First claim

The invention claimed is:

1. A burner comprising:
a first tube portion having a tube end including an ejection port, wherein combustion gas generated by combusting air-fuel mixture is ejected from the ejection port;
a second tube portion having an open end and a closed end, the closed end being located closer to the ejection port than the open end, the second tube portion extending in the first tube portion toward the ejection port;
a third tube portion that is disposed at least partially inside the second tube portion, the third tube portion having an open end and an annular wall that couples the third tube portion with an inner wall of the first tube portion;
a burner head that connects an inner circumferential surface of the first tube portion with an outer circumferential surface of the second tube portion, wherein the burner head and the second tube portion partition a space inside the first tube portion into a premixing chamber including a space inside the second tube portion and a combustion chamber located outside the second tube portion, the combustion chamber leading to the ejection port;
a communication passage provided in the burner head, the communication passage being oriented relative to the second tube portion so that air-fuel mixture that has been premixed in the premixing chamber flows through the open end of the second tube portion into a mixing chamber positioned upstream from the communication passage and flows from the mixing chamber through the communication passage into the combustion chamber, wherein the mixing chamber is partitioned from a space inside the first tube portion upstream from the communication passage by the annular wall of the third tube portion;
a heat exchanging portion arranged in the second tube portion, wherein the heat exchanging portion vaporizes liquid fuel with combustion heat of the combustion chamber and supplies the vaporized fuel to the premixing chamber, and an outer surface of the second tube portion functions as a heat receiving surface of the heat exchanging portion;
an ignition portion arranged in the combustion chamber; and
a fuel supply section including:
a vaporized fuel supply section that includes an electric heater, the vaporized fuel supply being configured to vaporize liquid fuel by being heated by the electric heater and supply the vaporized fuel to the premixing chamber,
a liquid fuel supply section configured to supply liquid fuel to the heat exchanging portion to vaporize the liquid fuel and supply the vaporized fuel directly to the premixing chamber; and
wherein
the second tube portion includes a heat receiving tube, which is an inner tube, and a cover, which is an outer tube covering an outer circumferential surface of the heat receiving tube,
the heat exchanging portion includes a flow passage defined by the outer circumferential surface of the heat receiving tube and an inner circumferential surface of the cover, and
liquid fuel flowing through the flow passage is vaporized with combustion heat of the combustion chamber.

2. The burner according to claim 1 , wherein
the outer circumferential surface of the heat receiving tube includes a groove extending to be continuous from the closed end to the open end, the groove defining the flow passage,
the closed end is an inflow end that allows liquid fuel to flow into the groove, and
the fuel supply section includes a supply pipe, which extends to the inside of the heat receiving tube and supplies liquid fuel to the inflow end.

3. The burner according to claim 1 , wherein the heat exchanging portion includes a fin, which is arranged on an outer circumferential surface of the cover and faces the combustion chamber.

4. The burner according to claim 1 , further comprising control circuitry configured to control driving of the fuel supply section, wherein
when the second tube portion reaches a target temperature during driving of the vaporized fuel supply section, the control circuitry is configured to stop driving of the vaporized fuel supply section and drive only the liquid fuel supply section.

5. The burner according to claim 1 , further comprising control circuitry configured to control driving of the fuel supply section, wherein
the control circuitry is configured to drive the liquid fuel supply section without driving the vaporized fuel supply section when temperature of the second tube portion is higher than or equal to a target temperature.

Assignees

• Hino Motors Ltd

Inventors

• Tsumagari Ichiro
• Shibuya Ryo
• Nakagawa Shun

Classifications

• F23N2225/16

  burner temperature · CPC title

• F23D11/40

  Mixing tubes; Burner heads · CPC title

• F23N1/02

  conjointly with air supply · CPC title

• F01N3/025 Primary

  using fuel burner or by adding fuel to exhaust · CPC title

• F23N2025/16

  Mechanical Engineering · mapped topic