Combustion chamber assembly unit for a vaporizing burner

1. A combustion chamber assembly unit for a vaporizing burner, the combustion chamber assembly unit comprising:

a combustion chamber housing comprising a circumferential wall extending in a direction of a combustion chamber housing longitudinal axis and a bottom area, the bottom area and the circumferential wall together defining a combustion chamber, wherein the bottom area comprises an evaporating medium carrier and porous evaporating medium on a side of the evaporating medium carrier facing the combustion chamber;

a first flame diaphragm with a first diaphragm opening, the first flame diaphragm being connected to the circumferential wall;

a second flame diaphragm with a second diaphragm opening the second flame diaphragm being connected to the circumferential wall and being disposed at an axial distance to the first flame diaphragm and on an axial side of the first flame diaphragm facing away from the porous evaporating medium; and

an air admission opening arrangement provided in the circumferential wall, the air admission opening arrangement comprising at least one air admission opening between the first flame diaphragm and the second flame diaphragm, wherein no air admission opening is provided in the circumferential wall in an axial area between the porous evaporating medium and the first flame diaphragm.

2. A combustion chamber assembly unit in accordance with claim 1 , wherein the bottom area further comprises an electrically energizable heating device, on a side of the porous evaporating medium facing away from the combustion chamber.

3. A combustion chamber assembly unit in accordance with claim 1 , wherein the air admission opening arrangement is configured for admitting air with a circumferential flow direction component.

4. A combustion chamber assembly unit in accordance with claim 1 , wherein the at least one air admission opening has an opening surface normal oriented essentially at right angles to a radial direction relative to the direction of the combustion chamber housing longitudinal axis.

5. A combustion chamber assembly unit in accordance with claim 1 , wherein the air admission opening arrangement comprises additional air admission openings to provide a plurality of air admission openings following one another in a circumferential direction.

6. A combustion chamber assembly unit in accordance with claim 5 , further comprising an air feed chamber enclosing the circumferential wall, the air feed chamber being connected with the combustion chamber via the air admission openings.

7. A combustion chamber assembly unit in accordance with claim 1 , further comprising an air feed duct open to the combustion chamber via the at least one air admission opening.

8. A combustion chamber assembly unit in accordance with claim 1 , wherein an air routing surface routes air to be admitted into the combustion chamber in a direction towards the at least one air admission opening.

9. A combustion chamber assembly unit in accordance with claim 8 , wherein the air routing surface routes air essentially in a circumferential direction.

10. A combustion chamber assembly unit in accordance with claim 8 , wherein the air routing surface is arranged radially within an air stream routed by the air routing surface.

11. A combustion chamber assembly unit in accordance claim 8 , wherein the air routing surface has a variable radial position.

12. A combustion chamber assembly unit in accordance with claim 11 , wherein the air routing surface has a discharge edge that has a variable radial position.

13. A combustion chamber assembly unit in accordance with claim 11 , wherein the air routing surface is prestressed in a radially outward direction or is prestressed in a direction in which the opening cross-sectional surface of the associated air admission opening is reduced or is prestressed in a radially outward direction and is prestressed in a direction in which the opening cross-sectional surface of the associated air admission opening is reduced.

14. A combustion chamber assembly unit in accordance with claim 1 , further comprising an electrically energizable heating device on a side of the evaporating medium carrier facing away from the combustion chamber or an electrically energizable ignition element provided in an axial area between the porous evaporating medium and the first flame diaphragm, wherein the electrically energizable ignition element extends into the combustion chamber starting from the circumferential wall.

15. A combustion chamber assembly unit in accordance with claim 1 , wherein the circumferential wall is configured expanding in a direction radially away from the bottom area, starting from the second flame diaphragm.

16. A vehicle heater comprising:

a combustion chamber assembly unit comprising:

a combustion chamber housing comprising a circumferential wall extending in a direction of a combustion chamber housing longitudinal axis and a bottom area, the bottom area and the circumferential wall together defining a combustion chamber, wherein the bottom area comprises an evaporating medium carrier and porous evaporating medium on a side of the evaporating medium carrier facing the combustion chamber;

a first flame diaphragm with a first diaphragm opening, the first flame diaphragm being connected to the circumferential wall;

a second flame diaphragm with a second diaphragm opening the second flame diaphragm being connected to the circumferential wall and being disposed at an axial distance to the first flame diaphragm and on an axial side of the first flame diaphragm facing away from the porous evaporating medium; and

an air admission opening arrangement provided in the circumferential wall, the air admission opening arrangement comprising at least one air admission opening between the first flame diaphragm and the second flame diaphragm;

a combustion air feed device feeding combustion air to the combustion chamber via the air admission opening arrangement; and

a fuel feed device feeding fuel to the combustion chamber via the porous evaporating medium, wherein no air admission opening is provided in the circumferential wall in an axial area between the porous evaporating medium and the first flame diaphragm.

17. A vehicle heater in accordance with claim 16 , wherein the bottom area further comprises an electrically energizable heating device on a side of the porous evaporating medium facing away from the combustion chamber.

18. A vehicle heater in accordance with claim 16 , wherein the air admission opening arrangement is configured for admitting air with a circumferential flow direction component.

19. A vehicle heater in accordance with claim 16 , wherein the air admission opening arrangement comprises additional air admission openings to provide a plurality of air admission openings following one another in a circumferential direction and further comprising an air feed chamber enclosing the circumferential wall, the air feed chamber being connected with the combustion chamber via the air admission openings.

20. A combustion chamber assembly unit for a vaporizing burner, the combustion chamber assembly unit comprising:

a combustion chamber housing comprising a circumferential wall extending in a direction of a combustion chamber housing longitudinal axis and a bottom area, the bottom area and the circumferential wall together defining a combustion chamber, wherein the bottom area comprises an evaporating medium carrier and porous evaporating medium on a side of the evaporating medium carrier facing the combustion chamber;

a first flame diaphragm with a first diaphragm opening, the first flame diaphragm being connected to the circumferential wall;

a second flame diaphragm with a second diaphragm opening the second flame diaphragm being connected to the circumferential wall and being disposed at an axial distance to the first flame diaphragm and on an axial side of the first flame diaphragm facing away from the porous evaporating medium, the circumferential wall comprising a circumferential wall portion extending between the first flame diaphragm and the second flame diaphragm and the circumferential wall comprising another circumferential wall portion extending between the porous evaporating medium and the first flame diaphragm, the another circumferential wall portion extending in an axial direction with respect to a longitudinal axis of the combustion chamber housing; and

an air admission opening arrangement provided only in the circumferential wall portion extending between the first flame diaphragm and the second flame diaphragm, wherein no air admission opening is provided in the another circumferential wall portion extending between the porous evaporating medium and the first flame diaphragm.