US 9,290,079 B2Granted

Vehicle heater

AssigneeEberspaecher Climate Control Systems GmbH & Co. KG

InventorsAndreas Collmer, Michael Haefner

Life of this patent

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Abstract

A vehicle heater includes a burner arrangement (12) with a flame tube (16), a heat exchanger housing (18) with a circumferential wall (20), which surrounds the flame tube and thus defines a waste gas backflow space (26) and has a waste gas outlet (38) from the waste gas backflow space. A flow cross section provided between the flame tube and the circumferential wall in a first axial area (33) of the waste gas backflow space is smaller in an outlet area (48) than in an opposite area (50) located opposite the outlet and the flow cross section in the outlet area increases in an expansion area following the first axial area. The flow cross section in a second axial area (35) following the expansion area (52), corresponds essentially to the flow cross section in the opposite area and/or the flow cross section has a stepped increase in the expansion area.

Claims20

Dependent claims

A vehicle heater comprising a burner arrangement, the burner arrangement comprising:

a combustion chamber;
a flame tube with a waste gas outlet end area, said flame tube carrying combustion waste gases away from said combustion chamber and extending elongated in a direction of a longitudinal axis with a constant cross sectional area;
a heat exchanger housing with a circumferential wall, which surrounds said flame tube and defines a waste gas backflow space extending essentially annularly about the longitudinal axis and with a bottom area located opposite said waste gas outlet end area of said flame tube, said heat exchanger housing having a waste gas outlet for releasing combustion waste gases from said waste gas backflow space in an outlet circumferential area of said heat exchanger housing, wherein a flow cross section provided between said flame tube and said circumferential wall in a first axial area of said waste gas backflow space is smaller in said outlet circumferential area than in a circumferential area located opposite the outlet circumferential area in relation to the longitudinal axis, and a flow cross section in said outlet circumferential area increases in an expansion area following said first axial area in an axial direction, wherein at least one of:
a flow cross section in the outlet circumferential area in a direction of said waste gas outlet in a second axial area following said expansion area corresponds essentially to a flow cross section in an opposite circumferential area;
and
a flow cross section increases in a stepped manner in said expansion area.

3 more elements

A vehicle heater burner arrangement comprising:

a combustion chamber;
a flame tube with a waste gas outlet end, said flame tube carrying combustion waste gases away from said combustion chamber and extending in a direction of a longitudinal axis with a constant cross sectional area;
a heat exchanger housing with a circumferential wall, which surrounds said flame tube and defines a waste gas backflow space extending essentially annularly between said flame tube and said circumferential wall and with a bottom located opposite said waste gas outlet end of said flame tube, said heat exchanger housing having a waste gas outlet for releasing combustion waste gases from said waste gas backflow space, said waste gas outlet extending radially outwardly from said circumferential wall at a location axially spaced from said waste gas outlet end, said circumferential wall having an outlet side and an opposite side, opposite to said outlet side, said waste gas backflow space comprising:
a first axial portion adjacent to said waste gas outlet end of said flame tube, said first axial portion having an outlet side flow cross section, on said outlet side, that is smaller than an opposite side flow cross section, on said opposite side;
a second axial portion adjacent to said waste gas outlet of said heat exchanger housing, said second axial portion having an outlet side flow cross section, on said outlet side, that is larger than said outlet side flow cross section of said first axial portion;
and
an expansion axial portion axially between said first axial portion and said second axial portion, said expansion axial portion having a flow cross section that expands on said outlet side from said outlet side flow cross section of said first axial portion to said outlet side flow cross section of said second axial portion.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/546,467Filed 11 Jul 2012
Priority: DE 10 2011 079 01812 Jul 2011
Published: US 2013/0015255 A117 Jan 2013
Granted: 22 Mar 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B60H 1/2212
The heat being derived from burners: arrangements of burners for heating air
F23C 3/00
Combustion apparatus characterised by the shape of the combustion chamber
F23M 9/10
Baffles or deflectors for air or combustion products ; Flame shields: baffles or deflectors formed as tubes, e.g. in water-tube boilers
B60H 1/00264
The devices being independent of the vehicle: transportable devices