Burner arrangement for heater

Patent metadata

Field	Value
Publication number	US-10823397-B2
Application number	US-201414907796-A
Country	US
Kind code	B2
Filing date	Jul 3, 2014
Priority date	Aug 1, 2013
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A burner arrangement (1), for a mobile heater operated with liquid fuel, is provided; having a combustion chamber (2) for converting fuel with combustion air in a flaming combustion, which combustion chamber (2) extends along a longitudinal axis (Z) in a main flow direction (H); a pre-mixing chamber (3), which is arranged fluidicly upstream of the combustion chamber (2), for generating a fuel-combustion air-mixture, which pre-mixing chamber (3) comprises a side wall (4); a fuel evaporation surface (O) arranged in the pre-mixing chamber; a fuel supply (10) for supplying liquid fuel; and a first combustion air supply (6) having a swirl body (7) for supplying a combustion air flow into the pre-mixing chamber (3) with a swirl such that the combustion air is guided along the fuel evaporation surface (O) with a tangential flow component. A neck portion (5) is formed at a transition from the pre-mixing chamber (3) to the combustion chamber (2) at which the flow cross-section abruptly widens in the main flow direction (H).

First claim

The invention claimed is:

1. A burner arrangement for a mobile heater operated with liquid fuel, said arrangement comprising:
a combustion chamber converting fuel with combustion air in a flaming combustion, said combustion chamber extending along a longitudinal axis in a main flow direction;
a pre-mixing chamber in which a flame does not form during regular heating operation, arranged upstream of the combustion chamber, formed separate from the combustion chamber and generating a fuel-combustion air-mixture, said pre-mixing chamber including a side wall tapering in the main flow direction;
a fuel evaporation surface arranged in the pre-mixing chamber and provided by an absorbent material evaporator body being arranged in the pre-mixing chamber;
a fuel supply supplying liquid fuel to said pre-mixing chamber; and
a first combustion air supply having a swirl body and supplying a combustion air flow into the pre-mixing chamber with a swirl such that the combustion air is guided along the fuel evaporation surface with a tangential flow component, wherein a neck portion is formed at a transition from the pre-mixing chamber to the combustion chamber at which a flow cross-section abruptly widens in the main flow direction.

2. The burner arrangement according to claim 1 , wherein the fuel evaporation surface extends over at least a portion of the side wall and the fuel supply includes a fuel outlet opening out at the side wall.

3. The burner arrangement according to claim 1 , wherein the first combustion air supply is formed such that the combustion air flow is supplied substantially parallel to the main flow direction with a tangential flow component.

4. The burner arrangement according to claim 1 , wherein the first combustion air supply opens out into the pre-mixing chamber at a face side of the pre-mixing chamber which faces away from the combustion chamber.

5. The burner arrangement according to claim 4 , wherein the first combustion air supply opens out into the pre-mixing chamber at the face side in a radially outer region of the face side.

6. The burner arrangement according to claim 1 , wherein the fuel outlet opens out in a region in which the evaporator body is arranged.

7. The burner arrangement according to claim 1 , wherein the first combustion air supply and the transition from the pre-mixing chamber to the combustion chamber are formed such that the fuel-combustion air-mixture is introduced into the combustion chamber with a tangential flow component such that a recirculation region in which gases flow opposite to the main flow direction forms in the combustion chamber behind the transition in a radially inner region at a longitudinal axis.

8. The burner arrangement according to claim 1 , wherein the first combustion air supply and the pre-mixing chamber are formed such that the fuel-combustion air-mixture enters into the combustion chamber with a swirl factor of at least 0.6.

9. The burner arrangement according to claim 1 , wherein a second combustion air supply supplying combustion air into the combustion chamber is formed downstream of the pre-mixing chamber.

10. A mobile heater operated with liquid fuel having a burner arrangement according to claim 1 .

Assignees

• Webasto SE

Inventors

• Ilchenko Volodymyr
• Dell Vitali
• Zoske Martin
• Mösl Klaus

Classifications

• F23C7/004 Primary

  using vanes · CPC title

• F23D5/123

  Inserts promoting evaporation · CPC title

• F23D2900/14241

  Post-mixing with swirling means · CPC title

• F23D2900/05002

  Use of porous members to convert liquid fuel into vapor · CPC title

• F23C7/06

  for heating the incoming air (arrangements of regenerators and recuperators F23L15/00) · CPC title