Combustion chamber assembly unit

A vehicle heater, comprising a combustion chamber assembly unit comprising:

• a combustion chamber housing with a combustion chamber defined by a circumferential wall and by a bottom area;
• a flame tube, which follows the circumferential wall in a direction of a housing longitudinal axis and surrounds a waste gas flow space, which waste gas flow space is open in the direction of the housing longitudinal axis, wherein a waste gas backflow space is formed between the flame tube and a housing wall of a housing at least partially surrounding the flame tube, the waste gas flow space being open to the waste gas backflow space in a first axial end area of the waste gas backflow space;
• a combustion air feed space surrounding the circumferential wall and being open to the combustion chamber via a plurality of combustion air feed openings provided in the circumferential wall;
• a partition separating the combustion air feed space from the waste gas backflow space;
• an oxidation catalytic converter device positioned downstream in relation to the combustion chamber in a second axial end area of the waste gas backflow space such as to surround the partition and configured such that combustion waste gas flows therethrough;
• and
• a hydrocarbon storage device or a nitrogen oxide storage device or both a hydrocarbon storage device and a nitrogen oxide storage device provided in the second axial end area of the waste gas backflow space.

A combustion chamber assembly unit for a fuel-operated vehicle heater, the combustion chamber assembly comprising:

• a combustion chamber housing comprising a waste gas flow space, a waste gas backflow space, a combustion chamber, a circumferential wall and a housing structure, the housing structure comprising a housing structure wall, a first axial end area, a second axial end area and a housing longitudinal axis, the first axial end area being located axially opposite the second axial end area with respect to the housing longitudinal axis, the circumferential wall defining at least a portion of the combustion chamber, the circumferential wall comprising a plurality of combustion air feed openings;
• a flame tube extending downstream of the circumferential wall with respect to a flow of fluid in the combustion chamber housing, the flame tube surrounding the waste gas flow space, the waste gas flow space being open in a direction of the housing longitudinal axis, wherein at least the flame tube and the housing structure wall define the waste gas backflow space, the housing structure wall at least partially surrounding the flame tube, the waste gas flow space being open to the waste gas backflow space in the first axial end area;
• a partition connected to the circumferential wall and the housing structure wall, at least a portion of the circumferential wall and at least a portion of the partition defining a combustion air feed space surrounding the circumferential wall, the combustion air feed space being in fluid communication with the combustion chamber via the plurality of combustion air feed openings, wherein the combustion air feed openings are provided in the circumferential wall;
• an oxidation catalytic converter device positioned downstream relative to the combustion chamber in the second axial end area, the oxidation catalytic converter device surrounding at least a portion of the partition and the oxidation catalytic converter device being configured such that combustion waste gases flow through the oxidation catalytic converter device;
• and
• a hydrocarbon storage device or a nitrogen oxide storage device or both a hydrocarbon storage device and a nitrogen oxide storage device provided in the second axial end area.