BURNER AND MOBILE HEATING DEVICE

Abstract

A burner for a mobile fuel-operated heating device, in particular for a vehicle heating device, comprising: —an evaporator receiving body for receiving an evaporator assembly for distributing and evaporating liquid fuel and—at least one fuel supply line for supplying liquid fuel to the evaporator assembly, wherein the burner has a circumferential wall with a plurality of air supply openings, and the circumferential wall has an increased thickness at least in a first region which surrounds one of the air supply openings in comparison to the thickness in a second region which lies between two air supply openings. The invention additionally relates to a mobile heating device and to a method for producing the evaporator receiving assembly.

Claims

1. A burner for a mobile fuel-operated vehicle heating device, comprising an evaporator receiving body for receiving an evaporator assembly for distributing and evaporating liquid fuel, and at least one fuel supply line for supplying liquid fuel to the evaporator assembly, wherein the burner has a circumferential wall with a plurality of air supply openings, and wherein the circumferential wall has an increased thickness at least in a first region surrounding one of the air supply openings compared to a second region located between two air supply openings.

2. The burner according to claim 1, wherein the air supply openings are arranged along at least two rows in the circumferential direction of the circumferential wall.

3. The burner according to claim 1, wherein the circumferential wall has at least one projection which comprises an opening surface of the air supply opening, wherein the projection is arranged on an inner side of the circumferential wall and/or on an outer side of the circumferential wall.

4. The burner according to claim 1, wherein the projection is at least partially beveled in an outer region.

5. The burner according to claim 1, wherein the air supply openings comprise first air supply openings having a first opening longitudinal axis, a first inlet surface and a first outlet surface, and second air supply openings each having a second opening longitudinal axis, a second inlet surface and a second outlet surface, wherein the first opening longitudinal axis forms a first angle α1 to a circumferential wall normal to the first air supply opening, wherein the second opening longitudinal axis forms a second angle α2, different from the first angle, to a circumferential wall normal to the second air supply opening, and wherein the first angle α1 and the second angle α2 are selected such that the first inlet surface and the first outlet surface as well as the second inlet surface and the second outlet surface at least partially overlap in the projection direction of the circumferential wall normal.

6. The burner according to claim 1, wherein the first angle α1 and the second angle α2 are at most 40°, and/or wherein exclusively the first angle α1 is 0°.

7. The burner according to claim 1, wherein the first angle α1 and/or the second angle α2 lies/lie in a plane spanned by the circumferential wall normal and a circumferential direction at the location of the respective air supply opening, and/or wherein the first angle α1 and/or the second angle α2 lies/lie in a plane spanned by the respective row, or wherein the first angle α1 and/or the second angle α2 lies/lie in a plane spanned by the circumferential wall normal at the location of the respective air supply opening and a central axis of the circumferential wall, or wherein the first angle α1 and/or the second angle α2 is/are oblique to a plane spanned by the circumferential wall normal and a circumferential direction at the location of the respective air supply opening, and/or wherein the first angle α1 and/or the second angle α2 is/are oblique to a plane spanned by the respective row.

8. The burner according to claim 1, wherein the air supply openings further comprise third air supply openings or third and fourth air supply openings having a third angle α3 and optionally fourth different angle α4 different from the first angle and the second angle, or wherein the air supply openings comprise a plurality of air supply openings each having different angles.

9. The burner according to claim 1, wherein the circumferential wall has an increased thickness exclusively in the region of first air supply openings or exclusively in the region of second air supply openings.

10. The burner according to claim 1, wherein the air supply openings are equally spaced along the circumferential direction.

11. The burner according to claim 1, wherein the thickness of the circumferential wall in at least a second region is 0.5 to 3.0 mm, preferably 1.0 to 2.0 mm, and the thickness of the circumferential wall in at least a first region is increased by 0.2 to 3.0 mm.

12. The burner according to claim 1, wherein the circumferential wall periodically has first regions with an increased thickness in the circumferential direction.

13. The burner according to claim 1, wherein the circumferential wall is arranged on an evaporator receiving body having a bottom region.

14. A mobile vehicle heating device, comprising a burner according to claim 1.

15. A method of producing a burner according to claim 1 comprising, selecting a first thickness of the circumferential wall, selecting at least one increase in thickness for the first regions depending on an angle of the air supply openings to a normal to the circumferential wall, and forming first regions in particular by applying protrusions to the circumferential wall.

16. The burner according to claim 1, wherein the air supply openings are arranged along two to four rows in the circumferential direction of the circumferential wall.

Description

[0038] The disclosure is also explained in more detail below with respect to further features and advantages by means of the description of embodiment examples and with reference to the accompanying drawings. It shows in each case in a principle drawing:

[0039] FIG. 1 evaporator receiving arrangement according to the prior art;

[0040] FIG. 2 evaporator receiving body with partially inclined air supply openings (not according to the present disclosure);

[0041] FIG. 3 cut along a row of air supply openings of the evaporator receiving body according to FIG. 2;

[0042] FIG. 4 first embodiment of an evaporator receiving body;

[0043] FIG. 5 cut along a row of air supply openings of a second embodiment; and

[0044] FIG. 6 cut along a row of air supply openings of a third embodiment.

[0045] FIG. 2 shows an evaporator receiving body 2 (not according to this disclosure). The evaporator receiving body 2 has a bottom region 6. The fuel supply line 4 opens into the bottom region. The fuel supply line 4 can, for example, be designed as a tube. In the illustrated representation, the bottom region 6 has a recess which is suitable for receiving an evaporator assembly.

[0046] A circumferential wall 8 extends from the bottom region 6. The circumferential wall is cylindrical in sections and conical in sections. An exclusively cylindrical design is also possible as an alternative. In a lower section of the circumferential wall, i.e. close to the bottom region 6, a receiving element 10 is arranged, which is suitable for receiving an ignition element and/or a flame guard. The height of the receiving element 10, measured from the bottom region, is in particular adapted to the size of the evaporator assembly.

[0047] A plurality of air supply openings 12 are provided in the circumferential wall 8. In the example shown, the air supply openings 12 are arranged in two rows 20, 22 in the circumferential direction. However, arrangement in only one row or in multiple rows is also possible. In FIG. 2, the number of air supply openings 12 in the row 20 is greater than in the row 22. In the row 20, moreover, the distance between the air supply openings 12 varies.

[0048] Here, first and second air supply openings 14, 15 are arranged in the row 22, and third and fourth air supply openings 16, 17 are arranged in the row 20.

[0049] The first air supply opening 14 is designed here with a first angle α1 of 0°. In this case, the circumferential wall normal 8a, i.e. the perpendicular of the circumferential wall 8, in the area of the first air supply opening 14 and a first opening longitudinal axis 14a are parallel to each other. With a cylindrical air supply opening 14, the first inlet surface 14b and the first outlet surface 14c completely overlap in projection along the circumferential wall normal 8a, see also FIG. 3.

[0050] Here, the second air supply opening 15 is formed at an angle. The second opening longitudinal axis 15a of the second air supply opening 15 and the circumferential wall normal 8a in the region of the second air supply opening 15 are at a second angle α2 to each other. In this case, this second angle α2 lies exclusively in a plane spanned by the circumferential wall normal 8a and the circumferential direction. When the second air supply opening 15 is cylindrical, the second inlet surface 15b and the second outlet surface 15c partially overlap in projection along the circumferential wall normal 8a.

[0051] Here, the third air supply opening 16 is formed with a third angle α3 of 0°. In this case, the circumferential wall normal 8a, i.e., the perpendicular of the circumferential wall 8, in the region of the third air supply opening 16 and a third opening longitudinal axis 16a are parallel to each other. With the air supply opening being cylindrical, the third inlet surface 16b and the third outlet surface 16c completely overlap in projection along the circumferential wall nor-mal 8a.

[0052] The fourth air supply opening 17 is formed obliquely here. The fourth opening longitudinal axis 17a of the fourth air supply opening 17b and the circumferential wall normal 8a in the region of the second air supply opening are at a fourth angle α4 to each other. In this case, this fourth angle α4 lies exclusively in a plane spanned by the circumferential wall normal 8a and the central axis. With the fourth air supply opening 17 being cylindrical, the fourth inlet surface 17b and the fourth outlet surface 17c partially overlap in projection along the circumferential wall normal 8a.

[0053] FIG. 3 shows an exemplary cut through a row of air supply openings of the evaporator receiving body according to FIG. 2 (not according to the present disclosure). In the section shown, first air supply openings 14 and second air supply openings 15 are arranged periodically. The periodicity here is A-B-B-A-B-B . . . . The angles α1 and α2 are intended to be exclusively in the plane shown in this figure. Here, the first air supply opening 14 is perpendicular to the circumferential wall 8. Thus, circumferential wall normal 8a and first opening longitudinal axis 14a are superimposed. The first outlet surface 14c of the first air supply opening 14 is arranged on the inner side of the circumferential wall 8, and the first inlet surface 14b is arranged on the outer side of the circumferential wall 8. The first inlet surface 14b and the first outlet surface 14c completely overlap in projection along the circumferential wall normal 8a.

[0054] The second air supply opening 15 runs obliquely. Thus, circumferential wall normal 8a and second opening longitudinal axis 15a are at a second angle α2 to each other. On the inner side of the circumferential wall 8, the second outlet surface 15c of the second air supply opening 15 is arranged, and on the outer side of the circumferential wall 8, the second inlet surface 15b is arranged. The second inlet surface 15b and the second outlet surface 15c partially overlap in projection along the circumferential wall normal 8a. Thus, an opening is provided when viewed along the circumferential wall normal 8a. The circumferential wall has a uniform thickness t.

[0055] FIG. 4 shows an embodiment of a burner with an evaporator receiving body 2. The evaporator receiving body 2 has a bottom region 6. A fuel supply line 4 opens into the bottom region. The fuel supply line can, for example, be designed as a tube. In the embodiment shown, the bottom region 6 has a recess which is suitable for receiving an evaporator assembly.

[0056] A circumferential wall 8 extends from the bottom region 6. The circumferential wall is cylindrical in sections and conical in sections. Alternatively, an exclusively cylindrical design is also possible. In a lower section of the circumferential wall 8, i.e. near the bottom region 6, a receiving element 10 is arranged which is suitable for receiving an ignition element and/or a flame monitor. The height of the receiving element 10, measured from the bottom region, is in particular adapted to the size of the evaporator assembly.

[0057] A plurality of air supply openings 12 is provided in the circumferential wall 8. In the example shown, the air supply openings 12 are arranged in two rows 20, 22 in the circumferential direction. However, an arrangement in only one row or in several rows is also possible. In FIG. 4, the number of air supply openings in row 20 is greater than in row 22. Furthermore, in row 20, the distance between air supply openings 20 varies.

[0058] In row 22, first and second air supply openings 14, 15 are arranged here, and third and fourth air supply openings 16, 17 are arranged in row 20. However, in alternative embodiments, it could also be exclusively first air supply openings 14 or exclusively first and second air supply openings 14, 15.

[0059] The first air supply opening 14 is designed here with a first angle α1 of 0°. In this case, the circumferential wall normal 8a, i.e. the perpendicular of the circumferential wall, in the area of the air supply opening and a first opening longitudinal axis 14a are parallel to each other. When the air supply opening is cylindrical, the first inlet surface 14b and the first outlet surface 14c completely overlap in projection along the circumferential wall normal 8a.

[0060] Here, the second air supply opening 15 is formed obliquely. The second opening longitudinal axis 15a of the second air supply opening 15 and the circumferential wall normal 8a in the region of the second air supply opening are at a second angle α2 to one another. In this case, this second angle α2 lies exclusively in a plane spanned by the circumferential wall normal 8a and the circumferential direction. When the second air supply opening is cylindrical, the second inlet surface and the second outlet surface partially overlap in projection along the circumferential wall normal. In the region of each of the second air supply openings 15, projections 30 are formed on an inner surface of the circumferential wall. The projections 30 have a gate shape in the viewing direction, that is, the projections extend toward the lower tapered portion of the circumferential wall. A partially circumferential side wall 34 of each projection 30 is beveled.

[0061] Here, the third air supply opening 16 is designed with a third angle α3 of 0°. In this case, the circumferential wall normal, i.e. the perpendicular of the circumferential wall, in the region of the air supply opening and a third opening longitudinal axis are parallel to each other. When the air supply opening is cylindrical, the third inlet surface 16b and the third outlet surface 16c completely overlap in projection along the circumferential wall normal.

[0062] Here, the fourth air supply opening 17 is formed obliquely. The fourth opening longitudinal axis 17a of the fourth air supply opening 17b and the circumferential wall normal 8a in the region of the fourth air supply opening are at a fourth angle α4 to each other. In this case, this fourth angle α4 lies exclusively in a plane spanned by the circumferential wall normal and the central axis. When the fourth air supply opening is cylindrical, the fourth inlet surface 17b and the fourth outlet surface 17c partially overlap in projection along the circumferential wall normal 8a.

[0063] FIG. 5 shows an exemplary section through the row 22 of air supply openings of the evaporator receiving body according to FIG. 4. In the section shown, first air supply openings 14 and second air supply openings 15 are arranged periodically. The periodicity here is A-B-B-A-B-B . . . . The angles α1 and α2 are to be exclusively in the plane shown. Here, the first air supply opening 14 is perpendicular to the circumferential wall 8. Thus, circumferential wall normal 8a and first opening longitudinal axis 14a are superimposed. The first outlet surface 14c of the first air supply opening 14 is arranged on the inner side of the circumferential wall, and the first inlet surface 14b is arranged on the outer side of the circumferential wall 8. The first inlet surface 14b and the first outlet surface 14c completely overlap in projection along the circumferential wall normal 8a. The first outlet surface 14c of the first air supply opening 14 is arranged on the inner side of the circumferential wall 8, and the first inlet surface 14b is arranged on the outer side of the circumferential wall 8. The first inlet circumferential 14b and the first outlet surface 14c completely overlap in projection along the circumferential wall normal 8a. In the region of the first air inlet opening 14, the circumferential wall has the circumferential wall thickness. There is no thickening. An air supply opening channel of the first air supply opening 14 is thus relatively short.

[0064] The second air inlet opening 15 extends obliquely. Thus, circumferential wall normal 8a and second opening longitudinal axis 15a lie one above the other at a second angle α2 to each other. The second outlet surface 15c of the second air supply opening 15 is arranged on the inner side of the circumferential wall 8, and the second inlet surface 15b is arranged on the outer side of the circumferential wall 8. The second inlet surface 15b and the second outlet surface 15c partially overlap in projection along the circumferential wall normal 8a. Thus, an opening is provided as viewed along the circumferential wall normal 8a. First projections 30 are arranged around the second air supply openings on the inside of the circumferential wall. In the example shown, the first projections 30 have an equal thickness at the respective outlet surface of the second air supply opening 15. On a side facing away from the outlet surface of the second air supply opening 15, the projection 30 has beveled side walls 34. A thickening is present. An air supply opening passage of the second air supply opening 15 is thus relatively long, thus improving the swirl of the combustion air.

[0065] FIG. 6 shows an exemplary cut through a row of air supply openings of an alternative embodiment of an evaporator receiving body. Deviating from the cut shown in FIG. 5, second projections 32 are arranged on the outer side of the circumferential wall instead of the first projections 30 on the inner side. The second projections are also arranged here in the region of the second air supply openings 15. In this embodiment, the circumferential wall is smooth or without protrusions on an inner side apart from the outlet surfaces.

[0066] Even though the disclosure is illustrated using the example of a burner with an evaporator receiving body, a circumferential wall with the air supply openings described above can also be arranged elsewhere in the burner, for example with a housing, as a separate component.

REFERENCE NUMERALS

[0067] 2 evaporator receiving body [0068] 4 fuel supply line [0069] 6 bottom region [0070] 8 circumferential wall [0071] 8a circumferential wall normal [0072] 10 receiving element [0073] 12 air supply opening [0074] 14 first air supply opening [0075] 14a first opening longitudinal axis [0076] 14b first inlet surface [0077] 14c first outlet surface [0078] 15 second air supply opening [0079] 15a second opening longitudinal axis [0080] 15b second inlet surface [0081] 15c second outlet surface [0082] 16 third air supply opening [0083] 16a third opening longitudinal axis [0084] 16b third inlet surface [0085] 16c third outlet surface [0086] 17 fourth air supply opening [0087] 17a fourth opening longitudinal axis [0088] 17b fourth inlet surface [0089] 17c fourth outlet surface [0090] 20 row [0091] 22 row [0092] 30 first projection [0093] 32 second projection [0094] 34 beveled side wall [0095] α1 first angle [0096] α2 second angle [0097] α3 third angle [0098] α4 fourth angle [0099] t thickness