Burner and mobile heating device

Abstract

The present invention relates to a burner for a fuel-operated mobile heating device, in particular for a vehicle heating device, said burner comprising - an evaporator receiver (2) for receiving an evaporator assembly for dispensing and evaporating a liquid fuel, and - at least one fuel supply line (4) for supplying the liquid fuel to the evaporator assembly, wherein the burner has a circumferential wall (8) having a plurality of air supply openings (12), wherein the circumferential wall (8) has an increased thickness in at least a first region surrounding one of the air supply openings compared to a second region located between two air supply openings. The present invention also relates to a mobile heating device and a method for manufacturing an evaporator receiving assembly.

Description

Technical Field

[0001] The invention relates to a burner for a fuel-operated mobile heating device, in particular a vehicle heating device, and to a fuel-operated mobile heating device, in particular a vehicle heating device, and to a method for producing the burner. Background Art

[0002] Burners, in particular evaporator burners, are used in particular in heating devices and / or auxiliary heating devices, in particular for vehicles, which are operated with liquid fuel. The burner can include an evaporator receiving assembly. Figure 1 Figure 2 shows an evaporator receiving assembly 2 according to the prior art. In this evaporator burner, liquid fuel is introduced into the evaporator 3 via a fuel supply line. For example, a metal fiber nonwoven can be used as the evaporator itself. The evaporator is saturated with liquid fuel and distributes it, particularly through capillary action. Heat provided by an ignition pin 11 or ignition element vaporizes and ignites the liquid fuel, allowing combustion of the fuel to be achieved by supplying air. For this purpose, air supply openings 12 are arranged in the circumferential wall 8. This arrangement is known, for example, from DE 10 2018 111 636 A1.

[0003] According to the prior art, DE 10 2005 032 980 B4 discloses an evaporator burner comprising a combustion chamber housing in which the evaporator medium is accommodated in a bowl-shaped carrier. The fuel supply is accommodated in the bottom area of the combustion chamber housing. The combustion chamber housing has a circumferential wall provided with a row of air supply openings arranged in the circumferential direction. The air supply openings each have a radial extension direction, i.e., a direction parallel to the normal of the circumferential wall. The perforations in the combustion chamber have the disadvantage that the fuel and air are unevenly distributed in the combustion chamber, thus causing combustion to proceed in an uncertain manner relative to an ideal combustion process characterized by complete and low-emission combustion. This can lead to soot formation and significantly increased NOx emissions. Empirical configuration of the perforations is often used to improve the distribution of air and fuel, and thus combustion.

[0004] DE 10 2012 211 932 B3 discloses another combustion chamber assembly. This combustion chamber assembly comprises a plurality of combustion air inlet openings, wherein at least one of the combustion air inlet openings has an opening longitudinal axis that is inclined relative to a surface normal of the circumferential wall in the region of the combustion air inlet opening. The combustion air inlet openings can be arranged in a plurality of rows. The combustion air inlet openings in different rows can have different inclination angles of the opening longitudinal axis. The combustion air inlet openings are particularly inclined to such an extent that no remaining radial openings exist when viewed in the direction of the surface normal. At large inclination angles exceeding 40°, the inlet depth is particularly insufficient.

[0005] DE 30 10 078 A1 discloses another heating device for a burner operating with liquid fuel. The heating device has a low-pressure atomizer. The heating device has an obliquely extending spiral opening in the circumferential wall. With typical wall thicknesses ranging from 1.0 to 2.0 mm, the thickness of the circumferential wall is still sufficiently small to ensure turbulence support in all operating conditions. Furthermore, due to production requirements, such as during molding, interrupted edges or chamfers are produced in the openings, particularly the spiral openings. This results in the air supply opening channel of the spiral opening being substantially shorter and therefore less efficient. The thickening of the circumferential wall further impairs the thermal balance of the burner. Summary of the Invention

[0006] The object of the present invention is to specify an improved burner for a fuel-operated mobile heating device and a fuel-operated mobile heating device as well as a method for producing the burner.

[0007] The object of the present invention is achieved with respect to the burner by the features of the burner according to the invention, with respect to the heating device by the features of the heating device according to the invention, and with respect to the method by the features of the method for producing a burner according to the invention. Suitable embodiments are disclosed in the corresponding dependent claims.

[0008] The burner according to the invention is used for a fuel-operated mobile heating device, in particular for a vehicle heating device, and comprises:

[0009] - an evaporator receiving body for receiving an evaporator assembly for dispensing and evaporating liquid fuel, and

[0010] - At least one fuel supply line for supplying liquid fuel to the evaporator assembly. The evaporator assembly preferably includes an evaporator. The evaporator can be constituted, for example, by a metal grille or a porous material having a large surface area. A burner is understood in the sense of the present invention as a component assembly, in particular a component, to which fuel and combustion air for conversion into heat, in particular for a combustion process, are supplied. The burner has a combustion chamber. The burner has a circumferential wall having a plurality of air supply openings. Preferably, the circumferential wall partially defines the boundary of the combustion chamber.

[0011] The circumferential wall has an increased thickness in at least a first region compared to a second region, the first region surrounding one of the air supply openings and the second region being located between two air supply openings. The air supply opening has an input opening on the outer side of the circumferential wall and an output opening on the inner side of the circumferential wall. An air supply opening channel of the air supply opening is formed between the input opening and the output opening. The air supply opening channel of the air supply opening is extended by the thickening in the first region. "Thickening" is understood as the change or difference in the thickness of the circumferential wall itself in the second region relative to the first region. The targeted thickening in the region of the air supply opening has the advantage that the wall thickness of the circumferential wall can be generally kept small and at the same time the guiding length of the air supply opening channel can be increased. In the case of an air supply opening channel arranged perpendicular to the circumferential wall, an increased input depth of the air flow can be achieved by the increased guiding length, and in the case of an obliquely or inclined air supply opening channel, the eddy or vortex of the air can be increased by the increased guiding length. The burner is particularly suitable for continuous combustion operation or for very strong local load reduction. The burner characteristic curve family can be extended, and fuel mixtures can be used.

[0012] In one configuration, the air supply openings are arranged in at least two rows, in particular two to four rows, in the circumferential direction of the circumferential wall.

[0013] In a further configuration, the circumferential wall has at least one protrusion surrounding the opening face of the air supply opening, wherein the protrusion is arranged on the inner side or the outer side of the circumferential wall. In particular, when the protrusion is arranged on the inner side of the circumferential wall, it is possible that the routed air guiding device does not extend directly on the wall but is constructed to be lifted at a desired distance from the circumferential wall. It is also possible that the first region is constituted by two protrusions opposed to each other on both sides of the circumferential wall. Advantageously, the base surfaces of the opposed protrusions coincide here. In particular, in the region of the same air supply opening (or, if necessary, also in the region of different air supply openings), at least one protrusion can also be arranged on the inner side of the circumferential wall, and one protrusion is arranged on the outer side of the circumferential wall.

[0014] In line with the purpose, the protrusion is at least partially inclined in the outer region. The chamfer, in particular the chamfer around the entire protrusion, improves the air guidance in the region of the protrusion.

[0015] In one configuration, the air supply opening includes a first air supply opening and a second air supply opening. The first air supply opening has a first opening longitudinal axis, a first input surface, and a first output surface. The second air supply opening has a second opening longitudinal axis, a second input surface, and a second output surface. Here, the first opening longitudinal axis forms a first angle with the normal of the circumferential wall of the first air supply opening. The second opening longitudinal axis forms a second angle (different from the first angle, in particular numerically different from the first angle) with the normal of the circumferential wall of the second air supply opening.

[0016] In line with the purpose, the first angle and / or the second angle are selected such that the first input surface and the first output surface or the second input surface and the second output surface at least partially overlap in the projection direction of the normal of the circumferential wall. The remaining opening in the circumferential normal direction is achieved by this configuration.

[0017] In a further configuration, the first angle and the second angle are at most 40° and / or only the first angle is 0°.

[0018] The first angle and / or the second angle can be in the plane formed by the normal of the circumferential wall and the circumferential direction (at the position of the corresponding air supply opening). Alternatively or additionally, the first angle and / or the second angle can be in the (corresponding) plane formed by the corresponding row.

[0019] In an alternative embodiment, the first angle and / or the second angle can be in the plane formed by the normal of the circumferential wall and the central axis of the circumferential wall (at the position of the corresponding air supply opening). In particular, the first angle and / or the second angle can be in the plane formed by the circumferential normal (at the position of the corresponding air supply opening) and the perpendicular line to the plane formed by the corresponding row.

[0020] Alternatively, the first angle and / or the second angle can extend inclined to the (or the aforementioned) plane formed by the normal of the circumferential wall and the circumferential direction at the position of the corresponding air supply opening. Alternatively or additionally, the first angle and / or the second angle can extend inclined to the plane formed by the (corresponding) row of the air supply opening.

[0021] In one configuration, the air supply openings further include a third air supply opening or a third air supply opening and a fourth air supply opening, each of which has a third angle different from the first and second angles, and optionally a fourth angle different from the first and second angles. The air supply openings may include a plurality of air supply openings, each having a different angle. Even if, in principle, each air supply opening could have a different angle from all other air supply openings, accurate burner design, for example using flow simulations, is complex.

[0022] In one advantageous configuration, adjacent air supply openings at least in the circumferential direction, and in particular adjacent air supply openings in all directions, have different angles. This can be achieved, for example, by an arrangement in which first air supply openings alternate with second air supply openings. The next row can then be started with a staggered arrangement.

[0023] The air supply openings may in particular be arranged in a periodic pattern along the circumferential direction, wherein in particular all rows of air supply openings have the same pattern. The pattern may for example be ABAB, ABCABC, AABBAABB, AABAAB, ABCBABC.

[0024] Furthermore, the air supply openings may be arranged axisymmetrically with respect to the central axis of the circumferential wall.

[0025] Expediently, the air supply openings are arranged at the same distance along the circumferential direction. Here, only the air supply openings of a respective row can have the same distance from one another or have the same distance from one another in all rows.

[0026] In a further embodiment, the circumferential wall has an increased thickness only in the first region of the first air supply opening or only in the first region of the second air supply opening. In a suitable embodiment, the circumferential wall has a first thickening in the first region of the first air supply opening and a second thickening in the first region of the second air supply opening, wherein the first thickening and the second thickening have different thicknesses.

[0027] The air supply openings may be arranged at equal intervals along the circumferential direction.

[0028] The thickness of the wall in the second region expediently amounts to 0.5 to 3.0 mm, preferably 1.0 to 2.0 mm, and / or the thickness of the wall in the first region (compared to the second region) is increased by 0.2 to 3.0 mm.

[0029] In one configuration, the circumferential wall periodically has a first region with an increasing thickness in the circumferential direction.

[0030] In one configuration, the circumferential wall is arranged on an evaporator receiver. The evaporator receiver has a bottom region according to the destination. The circumferential wall advantageously extends from the bottom region. A fuel supply line can lead into the bottom region of the evaporator receiver.

[0031] The mobile heating device according to the invention, in particular a mobile vehicle heating device, comprises a burner according to the invention. The heating device is particularly suitable for land vehicles.

[0032] The method according to the invention for manufacturing a burner, in particular a burner according to the invention, comprises:

[0033] - Selecting a first thickness of the circumferential wall,

[0034] - Selecting at least an increase in the thickness of the first region as a function of the angle of the air supply opening relative to the normal of the circumferential wall,

[0035] - Constructing the first region, in particular by applying a protrusion to the circumferential wall.

[0036] Alternatively, a circumferential wall with a second thickness can also be provided and then material thickness removed in the second region. Description of the Drawings

[0037] The invention is also explained in more detail below with reference to embodiments and with reference to the drawings with regard to further features and advantages. The schematic drawings each show:

[0038] Figure 1 An evaporator receiver assembly according to the prior art is shown;

[0039] Figure 2 An evaporator receiver (not according to the invention) with partially inclined air supply openings is shown;

[0040] Figure 3 A sectional view taken along a row of air supply openings of the evaporator receiver according to Figure 2 is shown;

[0041] Figure 4 A first configuration of the evaporator receiver is shown;

[0042] Figure 5 A sectional view taken along a row of air supply openings of the second configuration is shown, and

[0043] Figure 6 A sectional view taken along a row of air supply openings of the third configuration is shown. Detailed Description

[0044] Figure 2 An evaporator receptacle 2 (not according to the present invention) is shown. The evaporator receptacle 2 has a bottom region 6. A fuel supply line 4 leads into the bottom region. The fuel supply line 4 can be configured, for example, as a tube. In the view shown, the bottom region 6 has a recess that is suitable for receiving an evaporator assembly.

[0045] A circumferential wall 8 extends from the bottom region 6. The circumferential wall is configured sectionally cylindrically and sectionally conically. Alternatively, only a cylindrical configuration is also possible. In the section of the circumferential wall that is below, i.e., closer to the bottom region 6, a receiving element 10 is arranged that 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 matched to the dimensions of the evaporator assembly.

[0046] 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, an arrangement in only one row or in multiple rows is also possible. In Figure 2 this, the number of air supply openings in row 20 is greater than the number of air supply openings in row 22. In addition, the spacing between the air supply openings 12 in row 20 is different.

[0047] A first air supply opening 14 and a second air supply opening 15 are arranged in row 22 here, and a third air supply opening 16 and a fourth air supply opening 17 are arranged in row 20.

[0048] The first air supply opening 14 is implemented here with a first angle α1 of 0°. In this case, the circumferential wall normal 8a in the region of the first air supply opening 14, i.e., the vertical line of the circumferential wall 8, and the first opening longitudinal axis 14a are parallel to each other. In the cylindrically configured first air supply opening 14, the first input surface 14b and the first output surface 14c completely overlap in the projection along the circumferential wall normal 8a, see also Figure 3 as well.

[0049] The second air supply opening 15 is configured obliquely here. The second opening longitudinal axis 15a of the second air supply opening 15 forms a second angle α2 with the circumferential wall normal 8a in the region of the second air supply opening 15 relative to each other. The second angle α2 is in this case only in the plane spanned by the circumferential wall normal 8a and the circumferential direction. In the cylindrically configured second air supply opening 15, the second input surface 15b and the second output surface 15c partially overlap in the projection along the circumferential wall normal 8a.

[0050] The third air supply opening 16 is designed here with a third angle α3 of 0°. In this case, the circumferential wall normal 8a, i.e., a perpendicular to the circumferential wall 8, and the third opening longitudinal axis 16a are parallel to one another in the region of the third air supply opening 16. In the case of a cylindrically shaped air supply opening, the third inlet surface 16b and the third outlet surface 16c completely overlap when projected along the circumferential wall normal 8a.

[0051] The fourth air supply opening 17 is configured obliquely. The fourth opening longitudinal axis of the fourth air supply opening and the circumferential wall normal 8 in the region of the second air supply opening form a fourth angle α4 relative to each other. In this case, the fourth angle α4 lies only in a plane extending from the circumferential wall normal 8a and the central axis. In the cylindrically configured fourth air supply opening 17, the fourth inlet surface and the fourth outlet surface partially overlap when projected along the circumferential wall normal 8a.

[0052] Figure 3 Show the basis of the dissection Figure 2 An exemplary cross-sectional view of a row of air supply openings in an evaporator receiving body (not according to the present invention). In the cross-sectional view shown, the first air supply openings 14 and the second air supply openings 15 are arranged periodically. The period here is ABBABB... Angles α1 and α2 should only be in the plane shown in the figure. The first air supply opening 14 extends perpendicular to the circumferential wall 8. As a result, the circumferential wall normal 8a and the first opening longitudinal axis 14a overlap with each other. 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 the projection along the circumferential wall normal 8a.

[0053] The second air supply opening 15 extends obliquely. Consequently, the circumferential wall normal 8a and the second opening longitudinal axis 15a are at a second angle α2 relative to each other. A second outlet surface 15c of the second air supply opening 15 is arranged on the inner side of the circumferential wall 8, and a 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 when projected along the circumferential wall normal 8a. Consequently, an opening is present when viewed along the circumferential wall normal 8a. The circumferential wall has a uniform thickness t.

[0054] Figure 4 The embodiment of a burner with an evaporator receiving body 2 is shown. The evaporator receiving body 2 has a bottom region 6. The fuel supply line 4 opens into the bottom region. The fuel supply line can be designed as a pipe, for example. In the illustrated view, the bottom region 6 has a recess that is suitable for receiving the evaporator assembly.

[0055] The circumferential wall 8 extends from the bottom region 6. The circumferential wall is configured cylindrically and sectionally conically. Alternatively, only a cylindrical configuration is also possible. In the section of the circumferential wall 8 that is below, 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 monitor. The height of the receiving element 10 measured from the bottom region is in particular matched to the dimensions of the evaporator assembly.

[0056] A plurality of air supply openings 12 are provided in the circumferential wall 8. In the illustrated example, the air supply openings 12 are arranged in the circumferential direction in two rows 20, 22. However, an arrangement in only one row or in multiple rows is also possible. In Figure 4 this case, the number of air supply openings in row 20 is greater than the number of air supply openings in row 22. In addition, the spacing between the air supply openings 20 in row 20 is different.

[0057] Here, a first air supply opening 14 and a second air supply opening 15 are arranged in row 22, and a third air supply opening 16 and a fourth air supply opening 17 are arranged in row 20. However, in an alternative configuration, it can also only relate to the first air supply opening 14 or only to the first air supply opening 14 and the second air supply opening 15.

[0058] The first air supply opening 14 is implemented here with a first angle α1 of 0°. In this case, the circumferential wall normal 8a in the region of the air supply opening, i.e., the vertical line of the circumferential wall, and the first opening longitudinal axis 14a are parallel to each other. In the case of a cylindrically configured air supply opening, the first input surface 14b and the first output surface 14c completely overlap in the projection along the circumferential wall normal 8a.

[0059] The second air supply opening 15 is configured obliquely here. The second opening longitudinal axis 15a of the second air supply opening 15 forms a second angle α2 with the circumferential wall normal 8a in the region of the second air supply opening relative to each other. The second angle α2 is in this case only in the plane spanned by the circumferential wall normal 8a and the circumferential direction. In the case of a cylindrically configured second air supply opening, the second input surface and the second output surface partially overlap in the projection along the circumferential wall normal. First protrusions 30 are respectively constructed on the inner side of the circumferential wall in the region of the second air supply opening 15. Each first protrusion 30 has a gate shape in the viewing direction, that is, the protrusion extends into the conical region below the circumferential wall. The partially surrounding side walls 34 of each first protrusion 30 are inclined.

[0060] The third air supply opening 16 is designed here with a third angle α3 of 0°. In this case, the circumferential wall normal in the area of the air supply opening, i.e., a perpendicular to the circumferential wall, and the third opening longitudinal axis are parallel to one another. In the case of a cylindrically shaped air supply opening, the third inlet surface 16b and the third outlet surface 16c completely overlap when projected along the circumferential wall normal.

[0061] The fourth air supply opening 17 is configured obliquely. The fourth opening longitudinal axis of the fourth air supply opening and the circumferential wall normal 8a in the region of the fourth air supply opening form a fourth angle α4 relative to each other. In this case, the fourth angle α4 lies only in a plane extending from the circumferential wall normal and the central axis. In the case of a cylindrically configured fourth air supply opening, the fourth inlet surface and the fourth outlet surface partially overlap when projected along the circumferential wall normal 8a.

[0062] Figure 5 Show the basis of the dissection Figure 4 An exemplary cross-sectional view of a row 22 of air supply openings of an evaporator receiving body. In the cross-sectional view shown, the first air supply openings 14 and the second air supply openings 15 are arranged periodically. The period is ABBABB... Angles α1 and α2 should only be in the plane shown in the figure. The first air supply openings 14 extend perpendicular to the circumferential wall 8. As a result, the circumferential wall normal 8a and the first opening longitudinal axis 14a overlap. 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 when projected along the circumferential wall normal 8a. The circumferential wall in the area of the first air supply opening 14 has a circumferential wall thickness. There is no thickening. As a result, the air supply opening channel of the first air supply opening 14 is relatively short.

[0063] The second air supply opening 15 extends obliquely. Thereby, the circumferential wall normal 8a and the second opening longitudinal axis 15a are at a second angle α2 relative to each other. The second output surface 15c of the second air supply opening 15 is arranged on the inner side of the circumferential wall 8, and the second input surface 15b is arranged on the outer side of the circumferential wall 8. The second input surface 15b and the second output surface 15c partially overlap in the projection along the circumferential wall normal 8a. Thereby, there is an opening in the viewing direction along the circumferential wall normal 8a. A first protrusion 30 is arranged around the second air supply opening on the inner side of the circumferential wall. The first protrusion 30 has the same thickness at the corresponding output surfaces of the second air supply opening 15 in the illustrated example. The first protrusion 30 has an inclined side wall 34 on the side facing away from the output surface of the second air supply opening 15. There is a thickening. The air supply opening channel of the second air supply opening 15 is thereby relatively long and thereby improves the eddy current of the combustion air.

[0064] Figure 6 Exemplary cross-sectional view of a row of air supply openings showing an alternative configuration of the dissected evaporator receiver. Different from the cross-sectional view shown in Figure 5 Instead of the first protrusion 30 on the inner side, a second protrusion 32 is arranged on the outer side of the circumferential wall. The second protrusion is also arranged in the region of the second air supply opening 15 here. In this configuration, the circumferential wall is configured flat or without protrusions on the inner side except for the output surface.

[0065] Even if the present invention is shown by way of example with a burner having an evaporator receiver, the circumferential wall with the aforementioned air supply openings can also be arranged as a separate component in a burner having a housing, for example.

[0066] List of Reference Numerals

[0067] 2 Evaporator receiver

[0068] 4 Fuel supply line

[0069] 6 Bottom region

[0070] 8 Circumferential wall

[0071] 8a Circumferential wall normal

[0072] 10 Receiver element

[0073] 12 Air supply opening

[0074] 14 First air supply opening

[0075] 14a First opening longitudinal axis

[0076] 14b First input surface

[0077] 14c first output surface

[0078] 15 Second air supply opening 15a Second opening longitudinal axis 15b Second input surface

[0079] 15c Second output surface

[0080] 16 Third air supply opening 16a Third opening longitudinal axis 16b Third input surface

[0081] 16c Third output surface

[0082] 17 Fourth air supply opening 20 lines

[0083] 22 lines

[0084] 30 First protrusion

[0085] 32 Second protrusion 34 Inclined side wall α1 First angle α2 Second angle α3 Third angle α4 Fourth angle t Thickness

Claims

1. A burner for a fuel-operated mobile heating device, the burner comprising: - an evaporator receiver (2) for receiving an evaporator assembly for dispensing and evaporating liquid fuel, and - at least one fuel supply line (4) for supplying liquid fuel to the evaporator assembly, wherein the burner has a circumferential wall (8) having a plurality of air supply openings (12), wherein the circumferential wall (8) has an increased thickness in at least a first region compared to a second region, the first region surrounding one of the air supply openings and the second region being located between two air supply openings.

2. The burner according to claim 1, wherein, The burner is for a vehicle heating device.

3. The burner according to claim 1, wherein, The air supply openings (12) are arranged in at least two rows (20, 22) in the circumferential direction of the circumferential wall (8).

4. The burner according to claim 1, wherein, The air supply openings (12) are arranged in two to four rows in the circumferential direction of the circumferential wall (8).

5. The burner according to any one of claims 1 to 4, wherein, The circumferential wall (8) has at least one protrusion surrounding the opening face of the air supply opening (12), wherein the protrusion is arranged on the inner side of the circumferential wall (8) or / and on the outer side of the circumferential wall (8).

6. The burner according to claim 5, wherein, The protrusion is at least partially inclined in the outer region.

7. The burner according to any one of claims 1 to 4, wherein, The air supply openings (12) include a first air supply opening (14) and a second air supply opening (15), the first air supply opening having a first opening longitudinal axis (14a), a first input face (14b) and a first output face (14c), and the second air supply opening correspondingly having a second opening longitudinal axis (15a), a second input face (15b) and a second output face (15c), wherein the first opening longitudinal axis (14a) forms a first angle α1 with the circumferential wall normal (8a) of the first air supply opening (14), wherein the second opening longitudinal axis (15a) forms a second angle α2 different from the first angle with the circumferential wall normal (8a) of the second air supply opening (15).

8. The burner according to claim 7, wherein, The first angle α1 and the second angle α2 are selected such that the first input face (14b) and the first output face (14c) and the second input face (15b) and the second output face (15c) at least partially overlap in the projection direction of the circumferential wall normal (8a).

9. The burner according to claim 7, wherein, The first angle α1 and the second angle α2 are at most 40°, and / or wherein only the first angle α1 is 0°.

10. The burner according to claim 7, Among them, the first angle α1 and / or the second angle α2 lie in a plane defined by the circumferential wall normal (8a) and the circumferential direction at the location of the respective air supply opening (12), and / or wherein the first angle α1 and / or the second angle α2 lie in a plane defined by the respective row (20, 22), or Wherein, the first angle α1 and / or the second angle α2 are in the following plane, which is formed by unfolding the circumferential wall normal (8a) at the position of the corresponding air supply opening (12) and the central axis of the circumferential wall, or Wherein, the first angle α1 and / or the second angle α2 extend obliquely to the following plane, which is formed by unfolding the circumferential wall normal (8a) and the circumferential direction at the position of the corresponding air supply opening (12), and / or wherein, the first angle α1 and / or the second angle α2 extend obliquely to the following plane, which is formed by unfolding the corresponding rows (20, 22).

11. The burner according to claim 7, wherein, The air supply opening (12) further includes a third air supply opening (16) or a third air supply opening (16) and a fourth air supply opening (17), the third air supply opening having a third angle α3 different from the first angle and the second angle, or the third air supply opening and the fourth air supply opening having a third angle α3 different from the first angle and the second angle and a different fourth angle α4, or wherein, the air supply opening (12) includes a plurality of air supply openings (12) each having a different angle.

12. The burner according to claim 7, wherein, The circumferential wall has an increased thickness only in the region of the first air supply opening or only in the region of the second air supply opening.

13. The burner according to any one of claims 1 to 4, wherein, The air supply openings (12) are arranged at the same pitch along the circumferential direction of the circumferential wall (8).

14. The burner according to any one of claims 1 to 4, wherein, The thickness of the circumferential wall has a value of 0.5 to 3.0 mm in at least one second region, and the thickness of the circumferential wall increases by 0.2 to 3.0 mm in at least one first region.

15. The burner according to claim 14, wherein, The thickness of the circumferential wall has a value of 1.0 to 2.0 mm in at least one second region.

16. The burner according to any one of claims 1 to 4, wherein, The circumferential wall (8) periodically has a first region with an increased thickness in the circumferential direction.

17. The burner according to any one of claims 1 to 4, wherein, The circumferential wall (8) is arranged on an evaporator receiver (2) having a bottom region (6).

18. A heating device having a burner according to any one of claims 1 to 17.

19. The heating device according to claim 18, wherein, The heating device is a mobile heating device.

20. The heating device according to claim 18, wherein The heating device is a mobile vehicle heating device.

21. A method for manufacturing a burner according to any one of claims 1 to 17, comprising: - selecting a first thickness of the circumferential wall, - selecting to increase the thickness of at least the first region according to the angle of the air supply opening relative to the normal of the circumferential wall, - constructing the first region by applying a protrusion to the circumferential wall.

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