Combustion heater

Patent metadata

Field	Value
Publication number	US-9625147-B2
Application number	US-81288909-A
Country	US
Kind code	B2
Filing date	Jan 30, 2009
Priority date	Feb 1, 2008
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A combustion heater includes an inner tube having a supply passage for combustion gas in an inner portion, and an outer tube disposed to provide a separated combustion space in an outer periphery of the inner tube. A hole part for ejecting the combustion gas is formed on a tube wall of the inner tube and combustion gas is ejected with ejection characteristics such that circulating flow is formed on the periphery of a stagnation point. According to this combustion heater, a stable flame can be formed without increasing costs and the heating efficiency can be improved.

First claim

The invention claimed is:

1. A combustion heater comprising:
an inner tube having a supply passage for combustion gas in an inner portion,
an outer tube disposed to provide a separated combustion space in an outer periphery of the inner tube,
a hole part for ejecting the combustion gas being formed in a tube wall of the inner tube, and
a supporting member that supports a distal end side of the inner tube that is cantilever supported at a base end, between the inner tube and the outer tube, and maintains an interval between an outer peripheral surface of the inner tube and an inner peripheral surface of the outer tube, wherein:
the flow of combustion gas in the combustion space is set to form a stagnation point for combustion gas at a position which faces the hole part on the inner peripheral surface of the outer tube, and to form circulating flow in the periphery of the stagnation point, wherein
the hole part is formed at a distal end of the inner tube, and
a preheating region in which preheating of the combustion gas is performed in the supply passage using combusted gas is disposed at a base end side of a region of the inner tube in which the hole part is formed, and wherein
the supporting member is supported to allow some movement in an axial direction of the outer tube and
wherein the supporting member is a plate that partitions the combustion space, thereby avoiding combusted gas accumulating in a distal end of the outer tube.

2. The combustion heater according to claim 1 , wherein the supporting member is integrally formed in the inner tube.

3. A combustion heater comprising:
an inner tube having a supply passage for combustion gas in an inner portion,
an outer tube disposed to provide a separated combustion space in an outer periphery of the inner tube,
a hole part for ejecting the combustion gas being formed in a tube wall of the inner tube, and
a supporting member that supports a distal end side of the inner tube that is cantilever supported at a base end, between the inner tube and the outer tube, and maintains an interval between an outer peripheral surface of the inner tube and an inner peripheral surface of the outer tube, wherein:
the combustion gas is ejected with ejection characteristics to form a stagnation point for combustion gas at a position which faces the hole part on the inner peripheral surface of the outer tube and to form circulating flow in the periphery of the stagnation point; wherein
the hole part is formed at a distal end of the inner tube, and
a preheating region in which preheating of the combustion gas is performed in the supply passage using combusted gas is disposed at a base end side of a region of the inner tube in which the hole part is formed, and wherein
the supporting member is supported to allow some movement in an axial direction of the outer tube and
wherein the supporting member is a plate that partitions the combustion space, thereby avoiding combusted gas accumulating in a distal end of the outer tube.

4. The combustion heater according to claim 3 , wherein:
the outer peripheral surface of the inner tube comprises a first region in which the distance to the inner peripheral surface of the outer tube is shortest and a second region in which the distance is longer than the first region, and the hole part is disposed in the first region and forms a stagnation point for combustion gas on an inner peripheral surface of the outer tube.

5. The combustion heater according to claim 4 wherein:
the inner tube is disposed at an eccentric position to the outer tube, and the hole part is formed on the outer peripheral surface at an eccentric orientation to the inner tube.

6. The combustion heater according to claim 5 , wherein a plurality of inner tubes is disposed at an interval in a peripheral direction about the central axis of the outer tube.

7. The combustion heater according to claim 4 , wherein:
a second hole part is provided in a position separated from the first region and ejecting combustion gas to a position separated from the stagnation point, and the second hole part is disposed on both sides sandwiching the first region and disposed alternately with the hole part in a direction along the first region.

8. The combustion heater according to claim 3 , wherein:
a plurality of hole parts is arranged with an interval in the first region, and the supporting member is provided on both sides in a direction of alignment sandwiching the stagnation point corresponding to the respective hole parts, and has a size which respectively covers the combustion space facing the first region.

9. The combustion heater according to claim 2 , wherein the supporting member is integrally formed with the inner tube.

10. A combustion heater comprising:
an inner tube having a supply passage for combustion gas in an inner portion,
an outer tube disposed to provide a separated combustion space in an outer periphery of the inner tube,
a hole part for ejecting the combustion gas being formed in a tube wall of the inner tube,
a member for forming a stagnation point and circulating flow which is formed facing the hole part along an axial direction of the combustion space; and
a supporting member that supports a distal end side of the inner tube that is cantilever supported at a base end, between the inner tube and the outer tube, and maintains an interval between an outer peripheral surface of the inner tube and an inner peripheral surface of the outer tube, wherein
a stagnation point for combustion gas expelled from the hole part and circulating flow is formed on an outer peripheral surface of the member for forming a stagnation point and circulating flow at a position opposite the hole part, wherein
the hole part is formed at a distal end of the inner tube, and
a preheating region in which preheating of the combustion gas is performed in the supply passage using combusted gas is disposed at a base end side of a region of the inner tube in which the hole part is formed and wherein
the supporting member is supported to allow some movement in an axial direction of the outer tube and
wherein the supporting member is a plate that partitions the combustion space, thereby avoiding combusted gas accumulating in a distal end of the outer tube.

11. The combustion heater according to claim 10 , wherein:
the member for forming the stagnation point and circulating flow is disposed on a central axis of the outer tube, and a plurality of inner tubes is disposed about the central axis with the hole part facing the central axis.

12. The combustion heater according to claim 11 , wherein:
the member for forming the stagnation point and circulating flow has a concave curve formed about an axis of the inner tube at each of the plurality of inner tubes.

13. The combustion heater according to claim 11 , wherein:
the member for forming the stagnation point and circulating flow includes a supply passage for combustion gas in an inner section, and the hole part is provided for forming a stagnation point by ejecting combustion gas towards a respective outer peripheral faces of the plurality of inner tubes disposed about the central axis.

14. The combustion heater according to claim 10 , wherein:
a plurality of members for forming the stagnation point and circulating flow is provided at an interval in the combustion space, and is an inner tube that forms the hole parts facing the outer peripheral surface of respectively adjacent inner tubes.

15. The combustion heating according to claim 14 , wherein:
a plurality of inner tubes is disposed with an interval about a central axis

Assignees

• Kato Soichiro
• Takahashi Katsuyoshi
• Mizutani Taku
• Ihi Corp

Inventors

• Kato Soichiro
• Takahashi Katsuyoshi
• Mizutani Taku

Classifications

• F23D14/045

  with a plurality of burner bars assembled together, e.g. in a grid-like arrangement · CPC title

• F23D14/10

  with elongated tubular burner head · CPC title

• F23C2900/03006

  Reverse flow combustion chambers · CPC title

• F23D2203/1012

  tubular · CPC title

• F23D14/125 Primary

  heating a wall surface to incandescence · CPC title