阅读说明：本技术 移动式加热装置的蒸发器子组件 (Evaporator subassembly for a mobile heating device ) 是由 B·迈尔 V·戴尔 K·默斯尔 A·鲁奇克 T·潘维茨 V·阿伦茨 于 2019-05-09 设计创作，主要内容包括：本发明涉及一种用于移动式加热装置、特别是用于机动车的蒸发器子组件,其具有以下特征：蒸发器(1)、被构造成接收蒸发器(1)的蒸发器容纳器(2)、电热塞(4)和燃烧室(6),其中电热塞(4)相对于蒸发器(1)的主表面(11)延伸或被构造成可倾斜地延伸到燃烧室(6)中。(The invention relates to an evaporator subassembly for a mobile heating device, in particular for a motor vehicle, having the following features: the evaporator (1), an evaporator receptacle (2) configured to receive the evaporator (1), a glow plug (4) and a combustion chamber (6), wherein the glow plug (4) extends relative to a main surface (11) of the evaporator (1) or is configured to extend tiltably into the combustion chamber (6).)

1. Evaporator subassembly for a mobile heating device, in particular for a motor vehicle, wherein the evaporator subassembly has:

-an evaporator (1);

-an evaporator receptacle (2) configured to be able to receive an evaporator (1);

-a glow plug (4); and

-a combustion chamber (6);

wherein the glow plug (4) extends into the combustion chamber (6) obliquely to the main surface (11) of the evaporator (1) or is configured so as to be extendable into the combustion chamber (6) obliquely to the main surface (11) of the evaporator (1).

2. Evaporator subassembly for a mobile heating device, in particular for a motor vehicle, in particular according to claim 1, having:

-an evaporator (1);

-an evaporator receptacle (2) configured to be able to receive an evaporator (1);

-a glow plug (4);

it is characterized in that the preparation method is characterized in that,

at least one central projection (9) projects from a main surface (11) of the evaporator (1).

3. The evaporator subassembly of claim 1 or claim 2,

it is characterized in that the preparation method is characterized in that,

the primary, secondary or multistage evaporator dome (3) is arranged between the evaporator receptacle (2) and the fuel supply line (10).

4. The evaporator subassembly of any of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the glow plug (4) is received in the evaporator receptacle (2) via a glow plug bush (42), wherein the glow plug (4) is preferably fixed in the glow plug bush (42) by a limiting element, which in particular comprises a bent plate or is in the form of a bent plate and/or comprises an engagement structure or is in the form of an engagement structure, preferably comprises a thread structure and/or a press-fit structure.

5. The evaporator subassembly of any of the preceding claims, in particular of any of claims 2-4,

it is characterized in that the preparation method is characterized in that,

the cross-sectional contour of the projection (9) of the evaporator (1) is polygonal, in particular quadrangular, preferably rectangular or trapezoidal, with rounded corners, if applicable.

6. The evaporator subassembly of any of the preceding claims, in particular of any of claims 2-4,

it is characterized in that the preparation method is characterized in that,

the projection (9) of the evaporator (1) is at least substantially configured as an annular body which preferably flattens out in the radial direction of the evaporator receptacle (2).

7. The evaporator subassembly of any of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the evaporator (1) is at least partially made of a porous nonwoven, in particular a metal fiber nonwoven, and/or at least partially made of a fabric molded fiber member, and/or at least partially made of a porous heat resistant metal, preferably at least partially made of steel, such as high alloy steel 1.4841 or 1.4767.

8. The evaporator subassembly of any of the preceding claims,

it is characterized in that the preparation method is characterized in that,

a flame detector is provided, preferably in one piece with the glow plug (4).

9. Evaporator subassembly according to any of the preceding claims, in particular according to any of claims 2-8,

it is characterized in that the preparation method is characterized in that,

the protrusion (9) is an integral part of the evaporator (1).

10. The evaporator subassembly of any of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the evaporator receptacle (2) has at least one combustion air passage opening (6).

11. A vehicle, in particular an automotive vehicle, wherein the vehicle comprises an evaporator subassembly according to any one of the preceding claims.

12. Use of an evaporator subassembly according to any of claims 1-10 for a vehicle, in particular a motor vehicle.

13. A method for manufacturing the evaporator sub-assembly of any of claims 1-10,

it is characterized in that the preparation method is characterized in that,

the method comprises the following steps:

-forming an evaporator receptacle (2);

-providing an evaporator (1); and

-receiving the evaporator (1) in an evaporator receptacle (2).

14. The method of claim 13, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the projection (9) is produced in the same step as the evaporator (1), preferably by pressing a base material into a female mold, or is preferably attached to the evaporator by a bonded connection, in particular by means of sintering or welding, with the evaporator (1).

15. A kit for manufacturing an evaporator subassembly, in particular according to any one of claims 1 to 10, preferably for use in a method according to claim 13 or claim 14, the kit comprising an evaporator receptacle and at least two different evaporators selectively receivable therein and not structurally identical.

Technical Field

The invention relates to an evaporator subassembly for a mobile heating device and a vehicle, in particular a motor vehicle, comprising an evaporator receptacle and an evaporator.

Background

The evaporator subassembly is typically used in an evaporative burner, particularly in an auxiliary and/or intermediate heater operated with liquid fuel, particularly for a vehicle. In such evaporative burners, liquid fuel is introduced into the evaporator through a fuel supply line. In this case, the metal non-woven fabric and the metal mesh and the metal woven fabric may be a structure serving as an evaporator. In particular, the evaporator used is constructed with a large number of hollow spaces so that the fluid fuel is absorbed by the evaporator by capillary action, the evaporator being permeated with the fuel. In order to evaporate the fuel from the evaporator during the start-up phase of the evaporative burner, heat is required, which is usually provided by a glow plug.

In the prior art, on the one hand, comparatively complex evaporators are used, as described, for example, in DE 1918445 a1 and DE 2129663 a 1. DE 1918445 a1 and DE 2129663 a1 use sintered/porous combustion chamber cylinders comprising two combustion chambers. DE 4243712C 1 also describes a pot-shaped material which is absorbent and heat-resistant and thus functions as an evaporator.

DE 19880561B 4 discloses an evaporative burner for a heating device or for the thermal regeneration of an exhaust gas particle filter. It includes a combustion chamber having an outer peripheral delimiting wall and a front delimiting wall. The front delimiting wall has a central opening through which a central gas guiding web is arranged to project into the combustion chamber. The air-guiding web has longitudinal groove-like radial air outlets on its cylindrical web wall in the combustion chamber and a closed front wall at the end. The supply air web forms an annular chamber in the combustion chamber, in which a porous evaporator material in the form of a multilayer covering is arranged at the bottom of the combustion chamber at the level of the front limiting wall. The multi-layer covering is supplied with fuel by a lateral fuel supply during operation. The fuel is distributed uniformly in the annular evaporator material, evaporates at the combustion chamber inside the evaporator material and there burns together with the supplied air in the annular space of the combustion chamber.

The above-mentioned solutions of the prior art are relatively complex to manufacture and thus may result in high costs. Furthermore, in the (complex-form) evaporators of the prior art, an undefined flame direction may be generated during combustion operation, so that the service life of the corresponding evaporative burner may be considerably reduced.

For this reason, in the prior art, there are simply formed, in particular disk-shaped, evaporators which are received by an at least substantially pot-shaped evaporator receptacle, wherein the glow plug can be arranged, for example, axially, in particular coaxially, or radially relative to the evaporator receptacle.

Fig. 1A is a cross-sectional view of an evaporator subassembly according to the prior art, wherein an at least substantially disc-shaped evaporator 1 is received in a pot-shaped evaporator receptacle 2, and a glow plug 4 is arranged coaxially with respect to the evaporator receptacle 2. The term "coaxial" is intended to be understood herein as meaning that the glow plug 4 is arranged perpendicularly to the main surface 11 of the evaporator 1. The glow plug 4 is oriented by the glow plug bushing 42 and is firmly fixed in terms of its orientation. In fig. 1A, the fuel supply line 10 is arranged axially with respect to the evaporator receptacle 2. In this arrangement, additional constructional complications must be made in order to prevent the return of the fluid fuel into the glow plug bushing 42.

Fig. 1B is a cross-sectional view of another conventional arrangement in which the glow plug 4 is axially arranged and fixed relative to the main surface 11 of the evaporator 1 by means of a glow plug bush, while the fuel supply line 10 is coaxially arranged relative to the main surface 11. In this arrangement, additional constructional complications must also be made in order to prevent the return of the fluid fuel into the glow plug bushing 42. In addition, the arrangement of the glow plug 4 disrupts the uniform flow of the vaporized fuel, resulting in poor combustion performance of the arrangement.

Fig. 1C is a cross-sectional view of another arrangement of an evaporator subassembly according to the prior art. In this arrangement, the glow plugs 4 are arranged radially with respect to the disk-shaped evaporator 1, whereby the glow plugs 4 are fixed parallel to the main surface 11 of the evaporator 1. In this conventional arrangement, significant disadvantages arise during operation of the evaporator subassembly in the evaporative burner, since soot and/or carbon deposits can form in the gap 12 which exists between the main surface 11 of the evaporator 1 and the glow plug 4 arranged parallel to the main surface 11. These fumes and/or deposits lead to a thermal bridge between the glow plug 4 and the evaporator 1, so that, in particular during the start-up phase of an evaporative burner with an evaporator subassembly arranged in this way, the ignition energy introduced by the glow plug is distributed over a relatively large surface area, the resulting energy density thus no longer being sufficient to ignite the evaporative burner.

In the arrangements known from the prior art, significant technical disadvantages arise, since on the one hand the optimum fuel delivery is dependent on the position of the fuel supply line and on the other hand the optimum ignition capability and the optimum combustion operation are dependent on the position of the glow plug. It is almost impossible to optimize both positions simultaneously, so that in individual cases a series of tests are required to optimize the positioning. In addition, during the coaxial and axial arrangement of the evaporator assembly, additional, complex structural measures must be taken to prevent a portion of the liquid fuel from flowing into the glow plug sleeve. The radial arrangement of the glow plugs is also disadvantageous because with increasing operation, a thermal bridge is created between the glow plugs and the evaporator due to soot and carbon deposits. The thermal bridge causes the ignition energy introduced during the ignition operation to be distributed over an excessively large surface area. The energy density generated in this case may no longer be sufficient to ignite the evaporative burner, and therefore the evaporative burner in this state cannot be operated and must be cleaned and maintained in an expensive manner.

Disclosure of Invention

Therefore, as can be seen from the prior art at present, there is no satisfactory solution for the above drawbacks. It is therefore an object of the present invention to provide an arrangement of evaporator subassemblies which can be manufactured in a cost-effective manner on the one hand and which can improve fuel delivery, ignition capability (during the start-up phase) and homogeneous combustion operation on the other hand.

This object is achieved in particular by an evaporator subassembly according to claim 1 and/or claim 2 and a manufacturing method according to claim 15.

According to a first aspect of the invention, this object is achieved in particular by an evaporator subassembly having an evaporator, an evaporator receptacle configured to be able to receive the evaporator, a glow plug and a combustion chamber, wherein the glow plug extends into the combustion chamber obliquely with respect to a main surface of the evaporator or is configured to be able to extend into the combustion chamber obliquely with respect to a main surface of the evaporator. In this case, the size of the angle α between the main surface of the evaporator and the glow plug particularly has a value between 0 ° and 90 ° (excluding 0 ° and 90 °), preferably a value between 5 ° and 70 °, or particularly a value between 7 ° and 50 °, or more preferably a value between 9 ° and 30 °. Due to the oblique positioning, an arrangement can be provided in which a better ignition capability is maintained (over the long term), wherein in particular also a better fuel delivery is achieved. In addition, in particular homogeneous combustion operation can be achieved. Preferably, the glow plug is oriented away from the evaporator (extending obliquely). In particular, the distal end of the glow plug is further away from the evaporator or the main component of the evaporator than the proximal end (or than the portion of the glow plug at the location where it is introduced into the combustion chamber). In addition, the proximal end of the glow plug (or the portion of the glow plug where it is introduced into the combustion chamber) may also be farther away from the evaporator or the main component of the evaporator than the distal end.

According to a second aspect of the invention, this object is achieved, in particular in combination with the first aspect of the invention, by an evaporator subassembly having an evaporator, an evaporator receptacle configured to receive the evaporator, and a glow plug, wherein at least one central projection projects from a main surface of the evaporator (into the combustion chamber). Due to the projections arranged in this way, it is also possible for the evaporator subassembly to be operated with fuels which boil only at high temperatures, for example diesel fuel. Due to the bulge of the evaporator, an additional volume is formed which serves as an additional fuel reservoir in which additional fuel which has not yet evaporated can be received. The additional fuel reservoir has a particularly advantageous effect on the start-up or ignition performance of evaporative burners operated with fuels that boil only at very high temperatures, such as B7 and B100.

The term "main surface of the evaporator" is in particular intended to be understood as referring to the (free) surface of the main component of the evaporator. The main surface is preferably at least substantially flat (where applicable, with an uneven portion corresponding to at most 0.2 times the thickness of the main member) and/or defines at least 10%, preferably 20%, more preferably at least 50% of the inner surface (in contact with the gas in the combustion chamber) of the evaporator. The term "main component" is intended to be understood in particular as a (complete) evaporator without projections. The main member may have an at least substantially constant thickness and/or be configured disc-like (e.g. having a circular outer contour) and/or plate-like (e.g. having a polygonal, in particular rectangular contour). The evaporator or its main component may, where applicable, be constructed without openings having a diameter of more than 100mm or 10mm or 1 mm. The evaporator is not particularly configured in an annular manner. The evaporator or its main component or its main surface can be arranged at least partially (where applicable completely) in the combustion chamber.

A free space portion is preferably located between the evaporator and at least a portion of the glow plug projecting into the combustion chamber (that is, not a spatially separate structure, such as a partition wall or a portion thereof). Preferably, only the gas (during operation) is located in the region between the evaporator or (at least) a part of the evaporator projecting into the combustion chamber and the glow plug.

The term "central projection" is intended in particular to mean a projection which is spaced apart from the edge of the main surface in the radial direction by at least 5% of its (maximum) diameter and/or which is located at the geometric center at least in sections or whose dimension from the geometric center is at least not more than 50%, preferably 25%, relative to the edge of the main surface. Preferably, the outer contour of the bulge is point-symmetrical.

The evaporator can be a separate component with respect to the evaporator receptacle, in particular embedded therein in a non-positive-locking manner, or pressed into it. In some embodiments, the evaporator can be retained in a form-locking manner by a retaining device, for example comprising at least one retaining ring and/or at least one retaining projection. Alternatively or additionally, the evaporator may be fixed in a material-bonded manner.

The evaporator receptacle may be configured in a tank-like manner. According to the explanation, the evaporator receptacle is not configured in an annular manner or as a torus. The evaporator receptacle can form a separate component with respect to the combustion chamber wall or be constructed at least partially from the combustion chamber wall.

In a preferred embodiment of the invention, a one, two or more stage evaporator dome (dome) is disposed in the evaporator subassembly between the evaporator receptacle and the fuel supply line. The efficiency of the evaporator can thereby be further increased. For example, an improved heating power range can be achieved by using an evaporator dome. In this case, the shape of the evaporator bead can be adapted in a suitable manner to the shape of the evaporator.

The term "evaporator lobe" is intended in particular to be understood as a projection which can be configured, for example, as a cylinder, a cone, a dome or a quadrilateral. The one-stage or two-stage evaporator bead comprises in particular two or more projections which preferably meet in a laminated or stepped manner. One, two or more evaporator structures are received in the primary, secondary or multistage evaporator dome, which preferably have different porosities and/or different shapes. Furthermore, the one, two or more stage evaporator bosses (in general or with respect to the individual stages) and/or the evaporator receptacles may preferably be constructed in one piece.

In particular, the glow plug is received in the evaporator receptacle via a glow plug bushing, wherein the glow plug is preferably fixed in the glow plug bushing by a limiting element, which comprises in particular a bent plate or in the form of a bent plate and/or comprises an engagement structure or in the form of an engagement structure. The stop element preferably has a threaded and/or press-fit construction. Owing to the glow plug bushing integrated in the evaporator receptacle, the glow plug can be easily replaced, so that the glow plug can be quickly and easily serviced, for example a defective glow plug can be directly and quickly replaced.

Preferably, the cross-sectional contour of the projection of the evaporator can be configured as a polygon, in particular a quadrilateral, preferably a rectangle or a trapezoid, with rounded corners, where applicable. Such a protrusion can be manufactured in a relatively low cost manner.

In particular, the protrusion of the evaporator is at least substantially configured as an at least substantially annular body which is preferably flattened outwards in the radial direction of the evaporator receiver, whereby the shape of the protrusion can advantageously be adapted to the requirements of the burner in which the evaporative evaporator is used. By selecting the shape of the protrusion accordingly, the formation of a first pilot flame during start-up operation may be facilitated. In this case, fuel can be transported from the fuel reservoir to an ignition source, for example a glow plug, and be retained there. The heat to heat and vaporize the remaining fuel may be released by a pilot flame formed at the ignition source. Furthermore, hot flue gases which are left by the pilot flame in so-called dead zones can be avoided, so that the hot flue gases are conveyed directly out of the combustion chamber by the air flow. Furthermore, the current amount of fluid fuel, which can act as a hot ballast (thermal ballast) and thus negatively influence the combustion behavior, can also be reduced by a shape that is flattened in the radial direction (for example in the case of a trapezoid).

Preferably, the evaporator is at least partially manufactured from a porous non-woven fabric and/or mesh and/or woven fabric and/or interlaced fabric and/or mesh, in particular a metal (fibre) non-woven fabric and/or metal mesh and/or metal woven fabric and/or interlaced metal fabric and/or metal mesh and/or at least partially manufactured from a (further) textile molded fibre member, whereby manufacturing costs can be reduced. Alternatively or additionally to metals, other (heat-resistant) materials may also be used, for example, plastic materials and/or ceramic materials. In particular, the evaporator may be at least partially made of a porous heat resistant metal, preferably at least partially made of steel, in particular a high grade steel alloy (e.g. 1.4841 or 1.4767).

In a preferred embodiment, a flame detector is provided, which is preferably formed in one piece with the glow plug. In particular in this case, in a particularly simple embodiment, the temperature-dependent resistance of the ignition plug is measured. From the detected resistance value, conclusions can be drawn about the temperature in the combustion chamber, in particular about the extent to which flame combustion occurs. By integrating the glow plug and the flame detector into one component, the functionality of both components is created in a compact manner in one component, thereby enabling a further improvement in the arrangement of the individual flame detectors within the evaporator subassembly.

Preferably, the projection is an integral part of the evaporator, whereby the manufacturing costs can be further reduced.

Preferably, the evaporator receptacle has at least one combustion air perforation. In this way, an advantageous combustion air supply can be ensured or a construction of the evaporator subassembly which is as compact as possible can be achieved.

The fuel supply line may be arranged centrally (in particular as defined above with respect to the projection) with respect to (or centrally in) the evaporator receiver.

The above object is also achieved in particular by a vehicle, preferably a motor vehicle, comprising an evaporator subassembly of the above-mentioned type.

The above object is also achieved by applying an evaporator subassembly of the above type to a vehicle, in particular a motor vehicle (e.g. a car or truck).

The above object is also achieved by a method of manufacturing an evaporator sub-assembly, in particular of the above type, comprising the steps of: forming an evaporator receiver, providing an evaporator, and receiving the evaporator in the evaporator receiver. Preferably, the projection is produced in the same step as the evaporator, preferably by pressing the base material into the female mold. Thus, the evaporator can be manufactured in a particularly cost-effective manner. Alternatively, the projection can also be connected to the evaporator, preferably in a material-bonded manner, in particular by sintering or welding. Other method steps will be understood from the above description of the evaporator subassembly in particular.

The above object is also achieved in particular by a kit for manufacturing an evaporator subassembly, in particular of the above type, comprising an evaporator receptacle and at least two different evaporators which are selectively receivable in the evaporator receptacle and are not structurally identical. Preferably, the first evaporator has at least one first projection (preferably substantially as described above) and the second evaporator has at least one different/other projection (preferably substantially as described above) or no projection. Thus, evaporator subassemblies that can be used in particular for high-boiling fuels (e.g. diesel fuel) are distinguished from evaporator subassemblies for low-boiling fuels (e.g. petroleum fuel) simply by virtue of the bulge of the evaporator.

Overall, due to the modular structure of the evaporator subassemblies, it is easy to manufacture evaporator subassemblies for different fuels, in particular for diesel and petroleum fuels, in the same manufacturing plant, thus further reducing the manufacturing costs.

Preferably, the diameter of the evaporator (in radial direction) is at least 10mm, preferably at least 20mm, and/or at most 80mm, preferably at most 50 mm. The thickness of the evaporator (in axial direction; where applicable, without any protrusions) may be at least 0.7mm, preferably at least 1.5mm, and/or at most 5mm, preferably at most 4 mm. The diameter of the protrusions may be at least 5mm, preferably at least 8mm, and/or at most 30mm, preferably at most 25 mm. The height of the protrusions (in axial direction) may be at least 2mm, preferably at least 4mm, and/or at most 15mm, preferably at most 8 mm. The ratio between the thickness of the evaporator (without any protrusions) and the height of the protrusions may be at least 0.1, preferably at least 0.3, and/or at most 3, preferably at most 1, more preferably at most 0.5. Preferably, the protrusion may be configured as an annular body, wherein the outer diameter of the annular body is at least 8mm, preferably at least 16mm, and/or at most 40mm, more preferably at most 25mm, and/or the inner diameter of the annular body is at least 3mm, preferably at least 5mm, and/or at most 15mm, more preferably at most 12 mm. Where applicable, the evaporator may be configured as a cone, wherein the central part of the (truncated) cone may have a diameter of at least 5mm, preferably at least 12mm, and/or at most 30mm, preferably at most 18mm, and/or the outer diameter of the flattened part of the cone may be at least 10mm, preferably at least 20mm, and/or at most 40mm, preferably at most 40 mm.

Further embodiments can be gathered from the dependent claims.

Drawings

The invention is described below with reference to examples, which are explained in more detail with reference to the figures. In the drawings:

FIG. 1A is a cross-sectional view of an evaporator subassembly for a mobile heating apparatus as may be found in the prior art;

FIG. 1B is a cross-sectional view of an evaporator subassembly for a mobile heating apparatus according to another embodiment of the prior art;

FIG. 1C is a cross-sectional view of an evaporator subassembly for a mobile heating apparatus as is commonly used in the prior art;

FIG. 2 is a cross-sectional view of a first embodiment of an evaporator sub-assembly according to the present invention;

FIG. 3 is a cross-sectional view of a second embodiment of an evaporator sub-assembly according to the present invention;

FIG. 4 is a cross-sectional view of another embodiment of an evaporator sub-assembly according to the present invention;

FIG. 5 is a side view of another embodiment of an evaporator sub-assembly according to the present invention;

FIG. 6 is a side view of another embodiment of an evaporator subassembly according to the invention;

FIG. 7 is a side view of another embodiment of an evaporator subassembly according to the invention;

FIG. 8 is a cross-sectional view of one embodiment of an evaporator according to the present invention;

FIG. 9 is a cross-sectional view of another embodiment of an evaporator according to the invention; and

FIG. 10 is a cross-sectional view of one embodiment of an evaporator according to the present invention.

Detailed Description

Fig. 2 is a cross-sectional view of a first embodiment of an evaporator subassembly according to the present invention. The evaporator subassembly comprises an evaporator receptacle 2, in which evaporator receptacle 2 an evaporator 1 is received. The evaporator receptacle 2 opens into the combustion chamber 6. A fuel supply line 10 opens centrally in the evaporator receptacle 2, through which fuel reaches the evaporator 1, the fuel in the evaporator diffusing and evaporating out of the evaporator 1 in the direction of the combustion chamber 6.

Furthermore, a plurality of combustion air apertures 7 are formed in the side wall 14 of the evaporator receptacle 2, through which combustion air apertures 7 combustion air can pass to the combustion chamber 6 and can be mixed with the evaporated fuel. It is likewise possible (see fig. 4) to form the combustion air perforations 7 in a side wall (further side wall or additional side wall with respect to the evaporator receptacle) of the combustion chamber 6.

A glow plug bushing 5 is arranged in an additional part of the side wall 14, wherein said glow plug bushing 5 defines an angle α of the glow plug 4 relative to the main surface 11 of the evaporator 1. The main surface 11 is the (free) surface of the main member 8 of the evaporator 1. The main member 8 is formed by the (entire) evaporator 1 (without any protrusions 9, if applicable, see fig. 4). In fig. 2, the evaporator 1 does not have any protrusions 9 and has at least a substantially constant thickness or is configured as a disk-like (e.g. with a circular outer contour).

It is also conceivable for the glow plug bush 5 to be formed on another side wall of the combustion chamber 6. The glow plug 4 is received in a glow plug bushing 5, wherein the glow plug is fixed by a limiting element (not shown). Furthermore, a flame detector (not shown) may be integrated in the glow plug 4, so that the glow plug may provide an additional function of flame monitoring.

Fig. 3 is a cross-sectional view of a second embodiment of an evaporator subassembly according to the invention, wherein, in addition to the embodiment shown in fig. 2, a two-stage evaporator dome 3 is integrated in the evaporator receptacle 2 between the fuel supply line 10 and the evaporator 1.

Fig. 4 is a cross-sectional view of another embodiment of the invention, in which the combustion chamber 6 is delimited by a side wall 14 of the combustion chamber 6 that is separate from the evaporator receptacle. In addition to the exemplary embodiment shown in fig. 2, the limiting device 13 is arranged at the outer edge of the evaporator receiver 2 and is configured in the present exemplary embodiment as a limiting ring. The evaporator 1 is held in place by a stop 13.

Fig. 5 is a cross-sectional view of another embodiment. In this exemplary embodiment, in addition to the exemplary embodiment of fig. 4, the primary evaporator dome 3 is arranged between the evaporator receptacle 2 and the fuel supply line 10.

FIG. 6 is a cross-sectional view of another embodiment of an evaporator sub-assembly according to the present invention. In this case, the evaporator 1 has a central projection 9, which central projection 9 projects from the evaporator 1 in the direction of the combustion chamber 6, the central projection 9 thereby reducing the distance between the evaporator 1 and the glow plug 4. The protrusion 9 of the evaporator 1 is in this embodiment a cylinder (shown as a rectangle in cross-sectional view).

Fig. 7 is a cross-sectional view of a further embodiment of an evaporator subassembly according to the invention, wherein, in addition to the embodiment shown in fig. 6, an evaporator boss 3 is integrated in the evaporator receptacle 2 between the fuel supply line 10 and the evaporator 1. Preferably, the multi-stage evaporator dome 3 is integrated in the evaporator receptacle 2 (not shown).

Fig. 8 is a cross-sectional view of an embodiment of an evaporator 1 according to the invention. In this embodiment, the projection 9 is formed substantially of a cylinder.

Fig. 9 is a cross-sectional view of another embodiment of an evaporator 1 according to the present invention. In this embodiment, an annular body (torus) forms the protrusion 9. In this case, the upper side of the ring-shaped body projecting into the combustion chamber 6 is flattened in the radial direction, so that two trapezoids, each having one side flattened in the axial direction, can be seen in a cross-sectional view.

Fig. 10 is a cross-sectional view of another embodiment of an evaporator 1 according to the present invention. In this embodiment, the cone forms the projection 9 of the evaporator 1. In the cross-sectional view of fig. 10, the protrusion 9 is shown as a trapezoid.

In this connection it is noted that all the above-mentioned components per se and in any combination, in particular the details shown in the figures, are to be considered as having significance in inventive terms. Modifications thereof will occur to those skilled in the art.

List of reference numerals

1 evaporator

2 evaporator receiver

3 convex round part of evaporator

4 glow plug/flame detector

5 glow plug bushing

6 combustion chamber

7 combustion air perforation

8 Main Member

9 projection

10 fuel supply line

11 major surface of evaporator

12 gap

13 position limiter

14 side wall

The angle alpha.