Device for generating light and / or heat

Abstract

Device for generating light and / or heat, comprising: - a combustion chamber (18) for burning fuels; - an exhaust unit (20) connected to the combustion chamber (18) and extending vertically upwards from the combustion chamber (18) for discharging combustion gases and / or flames from the combustion chamber (18), the exhaust unit (20) being designed as a hollow profile; - a supply unit (16) connected to the combustion chamber (18) and extending from the combustion chamber (18) at least partially in the vertical direction upwards and in the horizontal direction for receiving and supplying fuel into the combustion chamber (18), wherein the supply unit (16) is designed as a hollow profile; - a collecting unit (22) arranged below the combustion chamber (18) for collecting combustion residues from the combustion chamber (18); - a housing (12) for at least partially accommodating the combustion chamber (18), the extraction unit (20) and the collecting unit (22), wherein the housing (12) is designed as a hollow profile whose longitudinal axis extends in the vertical direction; - a flame guide (30) arranged on a first end face (32) of the housing (12) and extending parallel to the longitudinal axis of the housing (12) to form a flame column, wherein the flame guide (30) is designed as a hollow profile; - a passage (24) extending between the inner wall of the housing (12) and the collecting unit (22) for providing an air flow; - a collecting element (26) arranged below the passage (24) in the region of a second end face (34) of the housing (12) is designed to retain combustion residues emerging through the passage (24) from the collecting unit (22) and / or the combustion chamber (18).

Description

Technical area

[0001] The following describes a device for generating light and / or heat, with the aid of which a visible flame can be created. The device is particularly intended for outdoor use, for example, in gardens, on patios, or at events. In addition to providing heat, it also serves as a decorative display of a stable column of flame. The targeted design, consisting of a combustion chamber, supply unit, exhaust unit, and a transparent flame guide, enables clean, controlled combustion. At the same time, safety aspects are taken into account by retaining escaping combustion residues and functionally directing airflow. Technical background

[0002] It is well known that so-called fire tubes or flame objects are used in decorative outdoor fireplaces to create atmospheric light and heat effects. Such devices typically consist of a cylindrical housing with an integrated combustion chamber in which solid fuels, particularly wood pellets, are burned. The resulting flame is often directed upwards via a vertically arranged, transparent flame guide, such as a glass tube, creating a visible column of flame.

[0003] There is a constant need for devices that generate light and / or heat and enable reliable and safe operation. In particular, the goal is to find a solution that combines visible flame formation with clean combustion without the uncontrolled release of unwanted residues or causing safety-related impairments. This also aims to functionally support the supply of combustion air without making the overall design unnecessarily complex or requiring high maintenance. The goal is to provide a reliable, durable, and aesthetically pleasing device that is particularly suitable for outdoor use.

[0004] Based on this situation, the present object is to propose a device for generating light and / or heat in which the escape of combustion residues from the device can be reduced without significantly impairing the air supply required for operation. At the same time, the device should remain simple and safe to handle, and a stable, visually appealing flame control should be enabled. Description - Technical solution

[0005] The present problem is solved by the features of the independent claim. Advantageous embodiments are specified in the subclaims, the description, and the drawings. To the extent technically feasible, the teachings of the subclaims can be combined arbitrarily with the teachings of the main and subclaims.

[0006] In particular, the object is achieved by a device for generating light and / or heat, comprising: - a combustion chamber for burning fuel; - an exhaust unit connected to the combustion chamber and extending vertically upwards from the combustion chamber for discharging combustion gases and / or flames from the combustion chamber, the exhaust unit being designed as a hollow profile; - a supply unit connected to the combustion chamber and extending from the combustion chamber at least partially in the vertical direction upwards and in the horizontal direction for receiving and supplying fuel into the combustion chamber, wherein the supply unit is designed as a hollow profile; - a collecting unit arranged below the combustion chamber for collecting combustion residues from the combustion chamber; - a housing for at least partially accommodating the combustion chamber, the extraction unit and the collecting unit, wherein the housing is designed as a hollow profile whose longitudinal axis extends in the vertical direction; - a flame guide arranged on a first end face of the housing and extending parallel to the longitudinal axis of the housing to form a flame column, the flame guide being designed as a hollow profile, - a passage between the inner wall of the housing and the collection unit to provide air flow; - a collecting element arranged below the passage in the region of a second end face of the housing is designed to retain combustion residues emerging through the passage from the collecting unit and / or the combustion chamber.

[0007] The claimed device serves to generate light and / or heat through the controlled combustion of solid fuels, in particular pellets, within a defined housing structure with optically guided flame formation. It comprises a multitude of functionally coordinated components. A combustion chamber is the combustion space in which the actual combustion of the fuel takes place.

[0008] The combustion chamber is designed for targeted flame formation and heat generation and represents the thermal center of the device. The exhaust unit is a tubular element connected in line with the combustion chamber. It serves to remove flue gases and / or flames.

[0009] The exhaust unit is designed as a hollow profile, forming a channel for the rising gases and allowing for directed flame guidance. The exhaust unit's profile is essentially parallel to the housing's longitudinal extension.

[0010] The feed unit connects an external pellet reservoir or filling area to the combustion chamber. It is designed as a hollow profile and extends in a combination of axial and radial directions. This enables gravity-based fuel supply while simultaneously thermally decoupling it from the central flame area.

[0011] The collection unit is positioned below the combustion chamber and serves to collect ash and combustion residues. Its positioning is chosen so that solids lowered from the combustion chamber by gravity can be reliably collected.

[0012] The central housing is designed as a longitudinal hollow profile and at least partially encloses the aforementioned functional units. It provides structural stability to the device and simultaneously acts as a flow envelope for air and heat. The housing geometry preferably extends upwards in the installation direction, with the longitudinal axis extending vertically.

[0013] The flame guide is located on a first end face of the housing. It is also designed as a hollow profile and allows for the formation of a visible flame column, particularly through a transparent material such as glass. The flame guide is functionally connected to the exhaust unit, allowing the flame to be channeled through.

[0014] The passage between the inner housing wall and the collection unit, particularly the front of the collection unit, provides the necessary air supply for combustion. This passage is deliberately positioned outside the central flame zone to ensure controlled flow and targeted oxygen enrichment in the combustion chamber. At the same time, a portion of the supplied air flows along the outside of the exhaust unit toward the flame guide, creating a chimney effect. This chimney effect promotes a suction effect, efficiently drawing the hot combustion gases from the combustion chamber toward the flame guide. This improves both the stability of flame formation in the glass tube and supports the thermal dynamics of the entire device.

[0015] The collection element, located below the passage, is a safety-relevant component. It is designed to contain ash, embers, or other hot particles that could escape from the passage. The collection element is designed so that it does not completely block the air supply, but merely protects the second end of the housing from debris escaping to the outside.

[0016] Advantageous aspects are explained below, and preferred modified embodiments are described further below. Explanations, particularly regarding advantages and definitions of features, are essentially descriptive and preferred, but not limiting, examples. If an explanation is limiting, this will be expressly stated.

[0017] Where ordinal numbers, such as "first", "second", etc., are used, for example to designate a component, an element, a method step, or a method action, these ordinal numbers are intended purely for differentiation in the designation and do not indicate any dependencies or sequences. This means, in particular, that, for example, a device does not have to have a "first component" in order to have a "second component." A device can also have a "first component" and a "third component" without necessarily having a "second component." Multiple units of the same ordinal number can also be provided, for example, multiple "first components."

[0018] The device components designed as hollow profiles – such as the housing, the supply unit, the exhaust unit, the flame guide, and the combustion chamber – can each have different cross-sectional shapes. The hollow profiles do not have to be uniform, but can be designed in various ways depending on functional and design requirements. For example, the housing can be cylindrical (round), the combustion chamber cuboid (rectangular), and the supply unit can be designed as a trapezoidal or hexagonal profile. Polygonal, oval, or asymmetrical profile cross-sections are also possible. In particular, the flame guide can be realized as a round glass tube, the supply unit as a rectangular sheet metal duct profile, and the exhaust unit as a polygonal cross-section. The choice of the respective profile can be adapted to the flow conditions, heat flow, manufacturing costs, or visual appearance.

[0019] The device comprises, in particular, at least three legs or feet, which are attached to the housing and / or the feed unit and / or the collection unit and serve to ensure stable installation on a floor or surface. The legs can be designed, for example, as permanently welded supports, screwed-on profiles, or height-adjustable elements and enable stable, tip-proof operation outdoors, particularly in the garden or on a terrace.

[0020] The following assumes that the device is in the installed position. Accordingly, the term "vertical" refers to a direction along the installation axis, i.e., from bottom to top, and the term "horizontal" refers to a direction perpendicular to the installation axis, i.e., perpendicular to the longitudinal axis of the housing. Terms such as "above" or "below" are to be understood in the context of this list. This functional definition allows for consistent orientation of the components and flow directions, regardless of the exact installation position or any inclinations in the area of ​​use.

[0021] The device is designed as a modular system in which all functional components are arranged along a central housing. Fuels, particularly wood pellets, are fed through the feed unit into the combustion chamber. Combustion takes place there with the addition of air, which flows through the passage between the collection unit and the inner wall. The resulting flame jet is directed vertically upward via the exhaust unit and then enters the flame guide, which is designed, in particular, as a cylindrical glass tube, creating a visually visible column of flame.

[0022] The ash produced during combustion falls through the first grid structure into the collection unit, which is designed to be removable. At the same time, turbulence could cause ash particles to escape through the passage. The collection element located below the passage prevents precisely this uncontrolled escape of combustion residues, especially when the lower, second end face of the housing is open or positioned close to the floor. This ensures safe, cost-effective operation with efficient air supply, while allowing the flame path to be controlled and decoratively visible.

[0023] In a further embodiment, the collecting element arranged below the passage is designed as an inclined or angled sheet metal. An inclined collecting element is understood to be a component that projects diagonally from the front of the housing towards the center of the housing. This geometry ensures that particles or ash that enter the lower area of ​​the housing do not escape uncontrollably onto the ground, but are specifically retained or diverted to the side by an inclined surface. At the same time, the air flow is only slightly influenced by the inclined arrangement, thus ensuring a consistent oxygen supply.

[0024] Furthermore, it is possible to design the collection element to be movable, particularly by pivoting or folding it on a housing wall. A pivoting collection element can be positioned so that it can be removed from the airflow as needed or opened for cleaning. This is particularly advantageous for ease of maintenance when ash or combustion residues accumulate on the collection element during extended operation. The ability to precisely adjust the position also allows for fine-tuning of the air flow at the lower end of the device.

[0025] Another advantageous embodiment concerns the choice of material for the collection element. The component can be made not only of sheet metal, but also alternatively of a refractory ceramic material or a high-temperature-resistant composite material. This increases durability, especially during continuous use, and enables use in environments with high humidity or corrosive components in the fuel.

[0026] In one embodiment, the housing is additionally equipped with one or more perforations in the lower area to facilitate air flow. These openings can promote airflow, particularly during windless operation or when heat demand is high, and simultaneously serve as a secondary air supply for more complete combustion.

[0027] Furthermore, the entire device can be designed in a modular manner. Modular means that the individual functional units, in particular the combustion chamber, collection unit, extraction unit, and pellet feed, are designed as separable components. These modules can be plugged, screwed, or connected with locking elements. A modular design facilitates production, transport, and maintenance, as well as the possibility of configuring individual variants.

[0028] An additional embodiment involves the design of the combustion chamber with air supply openings. These openings are provided in the side walls of the combustion chamber and enable the targeted supply of combustion air at the level of the flame center or the upper flame zone. This can be used as primary air, or as targeted secondary air openings for the afterburning of carbon monoxide or other unburned components. The air openings can be designed simply as holes, as slots, or as defined nozzle elements.

[0029] In a further advantageous embodiment, the pellet feed is designed as a feed tube comprising two segments. A lower section is arranged at an angle to the combustion chamber, while an upper section runs approximately parallel to the flame tube and ends at a horizontal distance from the glass tube. This arrangement ensures that the pellets enter the combustion chamber by gravity, while at the same time remaining thermally decoupled from the hot exhaust gas area. The feed is preferably inclined at an angle between 25° and 35°, with an angle of approximately 30° proving particularly aerodynamic and trouble-free. Such an angle of inclination ensures a reliable flow of the pellets without mechanical conveying elements.

[0030] Furthermore, the combustion chamber can be constructed from a square tube. This profile simplifies installation in the housing, allows for the secure insertion of grate structures, and provides flat contact surfaces for air vents or other functional components. Alternatively, the outer housing can be designed as a circular tube with a recess in the pellet feed area. This recess facilitates the insertion of the feed tube and reduces disruptive turbulence in the inflow area.

[0031] Finally, the upper end of the pellet feeder can be equipped with a cover flap. This cover flap serves to seal the feeder opening against rain, insects, or unwanted sparks. The flap can be manually operated or spring-loaded to close automatically. This feature increases operational safety during outdoor use and protects the fuel supply from the elements.

[0032] Alternatively or additionally, it can be provided that the collecting element closes the inner cross section of the housing in the region of the second end face by at least 20%, in particular at least 25%, particularly preferably at least 30%. In particular, it is provided that the inner cross section of the housing in the region of the second end face is open by at least 20%, in particular at least 25%, particularly preferably at least 30%, in order to allow air to flow into the housing. In a preferred embodiment, the collecting element is dimensioned such that it only covers part of the inner cross section of the housing on the second end face. The term “inner cross section” is to be understood as the free, flow-relevant cross section of the hollow profile in the lower end region of the housing.By partially closing this cross-section, typically about one-third in designs, a barrier is created to prevent ash or embers from escaping without interrupting the air supply. The remaining opening remains open and continues to allow ambient air to enter the interior of the device. This ratio between shielding and permeability represents a functional compromise between safety and combustion efficiency. The percentage specification allows for dimension-independent, design-neutral scalability.

[0033] Alternatively or additionally, it can be provided that the collecting element is designed as a plate extending transversely to the longitudinal axis of the housing. In particular, it is provided that the collecting element is made of a metal sheet. The collecting element can simply be designed as a plate that extends transversely to the installation axis or the longitudinal axis of the housing. This orientation means that the element projects essentially horizontally into the housing and is positioned so that it is located directly below the passage. The plate shape enables simple production and assembly, especially when the component is made of a heat-resistant metal sheet. The choice of material ensures that the element remains dimensionally stable and permanently functional even in direct contact with hot particles.A metal sheet also offers the advantage of good thermal conductivity and mechanical robustness, which is particularly advantageous for outdoor use.

[0034] Alternatively or additionally, the collection element can be provided with openings, slots and / or perforations for the flow of air. To further optimize the flow behavior, the collection element can be provided with openings. These openings, which can be designed as bores, slots or perforation patterns, allow air to flow directly through the collection element into the housing. This ensures an additional supply of combustion air despite the shielding function. This can be particularly important in cases where the collection element takes up a large part of the internal cross-section of the housing or where the air requirement of the combustion chamber is high. The air outlets can be placed evenly or specifically in flow-optimized areas.

[0035] Alternatively or additionally, it can be provided that the collecting element can be arranged adjustably in the region of the second end face of the housing. In particular, it is provided that the adjustability of the collecting element allows the air flow introduced in the region of the second end face of the housing to be adjusted. A further advantageous embodiment provides that the collecting element is not rigidly arranged in the housing, but is adjustably arranged. Such adjustability can be achieved by slots, guide rails or a folding joint. It allows the user to move the collecting element closer to or further away from the air opening as needed. This adjustment option allows the air inlet into the housing to be specifically regulated, for example to adapt to different fuel types, weather conditions or performance requirements. In addition, the flow of air through the collecting element itself can be influenced as desired.

[0036] Alternatively or additionally, the housing can be provided with a lateral recess for at least partially accommodating the combustion chamber, the extraction unit, and the collection unit. In particular, the passage is arranged adjacent to a housing wall opposite the recess. The housing can be provided with a lateral recess through which the combustion chamber, the collection unit, and the extraction unit can be pushed or inserted into the housing. This recess is functionally arranged so that the passage between the collection unit and the housing wall is on the opposite side. This arrangement creates a clear separation between the supply side and the airflow side, which lengthens the flow path and thermally stabilizes it. The lateral insertion opening also facilitates the assembly and maintenance of individual components.

[0037] Alternatively or additionally, the collection unit can be designed to be displaceable, in particular in the horizontal direction. In particular, it is provided that the cross-section of the passage can be adjusted by displacing the collection unit. In a further embodiment, the collection unit itself is mounted so that it can be displaced. A horizontal displacement of the collection unit changes the distance to the housing wall and thus the flow cross-section of the passage. Through this targeted change, the air flow through the housing can be regulated. At the same time, cleaning the collection unit is simplified because it can be pulled out completely or moved into a maintenance position if necessary. The displaceable mounting can be realized using guide grooves, rails or frame elements.

[0038] Alternatively or additionally, it can be provided that the flame guide is at least partially transparent. In particular, it is provided that the flame guide is made of heat-resistant glass, in particular borosilicate glass, and is arranged at its lower end at least partially within the housing. The flame guide is preferably transparent. This serves particularly decorative purposes, in order to use the flame as a visible design element. The transparent material is ideally a heat-resistant glass such as borosilicate glass, which combines high thermal resilience with optical clarity. The flame guide can be inserted into the housing or integrated so that the flame channel is flush or slightly overlapping with the glass. This design stabilizes the flame and at the same time protects against flying sparks.

[0039] Alternatively or additionally, a first grid structure can be arranged between the combustion chamber and the collection unit. In particular, a second grid structure is provided between the combustion chamber and the extraction unit. For the targeted retention of combustion residues, grid structures are provided between the combustion chamber and the collection unit below. This first grid structure prevents larger particles from falling uncontrollably into the lower area of ​​the device. In addition, a second grid structure can be used between the combustion chamber and the extraction unit. This serves to retain sparks or glowing particles that would otherwise enter the flame guide. Both grids can be made of metal, be replaceable and heat-resistant.

[0040] Alternatively or additionally, it can be provided that the collecting element, the collecting unit, the combustion chamber and the extraction unit are arranged in the housing in such a way that the air flow is introduced into the housing at least via the second end face and is guided via the passage around the end face of the collecting unit into the combustion chamber and additionally on the outside along the extraction unit in the direction of the flame guide. In a particularly functional overall arrangement, the components mentioned are positioned in such a way that the air enters the housing via the lower end face, is guided below and to the side of the collecting unit through the passage and then flows on in two ways: On the one hand, part of the air is guided directly into the combustion chamber, where it serves as combustion air. On the other hand, a second part of the air flows upwards along the outside of the extraction unit in the direction of the flame guide.This airflow along the hot inner core creates a chimney effect, which supports the dissipation of flames and gases while simultaneously ensuring a visually calm flame pattern. The flow path can thus be used twice: for primary combustion and for thermal stabilization. Short description of the drawings

[0041] A preferred technical solution is explained in more detail below with reference to the accompanying drawings using preferred embodiments. The term "figure" is abbreviated to "Fig." in the drawings.

[0042] The drawings show Fig. 1 is a side sectional view of an embodiment of a device for generating light and / or heat; and Fig. 2 a perspective sectional view of the device according to Fig. 1. Detailed description of the drawings

[0043] The described embodiments are merely examples that can be modified and / or supplemented in a variety of ways within the scope of the claims. Each feature described for a specific embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a specific claim category can also be used correspondingly in an embodiment of a different claim category.

[0044] Fig. 1 shows a side sectional view of an embodiment of a device 10 for generating light and / or heat in the erected state. The device 10 has a cylindrical housing 12 whose longitudinal axis extends vertically and serves as a central support element for the other components. Several legs 14 are arranged on the underside of the housing 12, which extend diagonally outwards and each end in a plate-shaped support surface. The legs 14 ensure that the device 10 stands stable on a surface. Attached to the side of the housing 12 is a feed unit 16, which is designed as an inclined hollow profile and extends from an upper free end at a feed angle to the combustion chamber 18. The feed unit 16 serves to receive and gravity-controlled feed fuel, in particular pellets, into the combustion chamber 18.The combustion chamber 18 is cuboid-shaped and, in the embodiment shown, has lateral screw connections for attachment to the housing 12. Above the combustion chamber 18, the exhaust unit 20 connects seamlessly to the combustion chamber 18. The exhaust unit 20 extends vertically upwards. The combustion chamber 18 is located in the central area of ​​the housing 12 and is firmly received therein. Below the combustion chamber 18, a collecting unit 22 is arranged, which is also integrated into the housing 12. This collecting unit 22 serves to collect combustion residues, in particular ash and / or embers. Between the collecting unit 22 and the opposite inner wall of the housing 12, a passage 24 is formed, through which air can be supplied from the environment.In the region of a first end face 32 of the housing 12, a flame guide 30 is arranged, which is designed as a transparent glass tube, in particular made of borosilicate glass. The flame guide 30 is designed independently of the extraction unit 20 and serves to control the guidance and presentation of the flame column. A first grid structure 28 is arranged between the combustion chamber 18 and the collection unit 22, through which combustion residues can pass and reach the collection unit 22. A second grid structure 36 is provided between the combustion chamber 18 and the extraction unit 20, which serves as a flame arrestor or for spark control. Below the passage 24, in the region of a second end face 34 of the housing 12, there is a collection element 26, which extends transversely to the longitudinal axis of the housing 12 and serves to retain falling embers or ash from the passage 24.

[0045] Fig.Figure 2 shows a perspective sectional view of the device 10. Here, the housing 12, the supply unit 16, the combustion chamber 18, the first grid structure 28, the collecting unit 22, and the collecting element 26 arranged below are particularly clearly visible. The supply unit 16 ends above the grid structure 28 at the combustion chamber 18, so that the fuel can be introduced specifically into the area above the grid. The laterally arranged passage 24 runs between the inner wall of the housing 12 and the front side of the collecting unit 22. Ambient air can be introduced into the device 10 through the passage 24, whereby the air flow serves on the one hand to supply oxygen for combustion in the combustion chamber 18 and on the other hand also rises along the outside of the exhaust unit 20 into the flame guide 30. This chimney effect creates a suction effect that supports the discharge of the combustion gases from the combustion chamber 18 towards the flame guide 30.The collecting element 26 is located below the passage 24 and is designed as a flat element with a beveled edge. It protects the floor from falling ash or embers without significantly impeding the air flow into the combustion chamber 18. The flame guide 30 is arranged parallel to the longitudinal axis of the housing and allows for a visually appealing presentation of the escaping flames. The lower end of the flame guide 30 is positioned within the housing 12, forming a closed combustion and exhaust channel. List of reference symbols 10 Device 12 housings 14 legs 16 Feed unit 18 Combustion chamber 20 trigger unit 22 Collection unit 24 rounds 26 Collection element 28 First lattice structure 30 Flame guidance 32 First end face of the housing 34 Second end face of the housing 36 Second lattice structure

Claims

[1] Device for generating light and / or heat, comprising: - a combustion chamber (18) for burning fuels; - an exhaust unit (20) connected to the combustion chamber (18) and extending vertically upwards from the combustion chamber (18) for discharging combustion gases and / or flames from the combustion chamber (18), the exhaust unit (20) being designed as a hollow profile; - a supply unit (16) connected to the combustion chamber (18) and extending from the combustion chamber (18) at least partially in the vertical direction upwards and in the horizontal direction for receiving and supplying fuel into the combustion chamber (18), wherein the supply unit (16) is designed as a hollow profile; - a collecting unit (22) arranged below the combustion chamber (18) for collecting combustion residues from the combustion chamber (18); - a housing (12) for at least partially accommodating the combustion chamber (18), the extraction unit (20) and the collecting unit (22), wherein the housing (12) is designed as a hollow profile whose longitudinal axis extends in the vertical direction; - a flame guide (30) arranged on a first end face (32) of the housing (12) and extending parallel to the longitudinal axis of the housing (12) to form a flame column, wherein the flame guide (30) is designed as a hollow profile; - a passage (24) extending between the inner wall of the housing (12) and the collecting unit (22) for providing an air flow; - a collecting element (26) arranged below the passage (24) in the region of a second end face (34) of the housing (12) is designed to retain combustion residues emerging through the passage (24) from the collecting unit (22) and / or the combustion chamber (18). [2] Device according to claim 1, wherein the collecting element (26) closes the inner cross section of the housing (12) in the region of the second end face (34) by at least 20%, in particular at least 25%, particularly preferably at least 30%, wherein in particular the inner cross section of the housing (12) in the region of the second end face (34) is open by at least 20%, in particular at least 25%, particularly preferably at least 30%, in order to allow air flow into the housing (12). [3] Device according to claim 1 or 2, wherein the collecting element (26) is designed as a flat element, in particular a plate, extending transversely to the longitudinal axis of the housing (12), wherein in particular the collecting element (26) is made of a metal sheet. [4] Device according to one of the preceding claims, wherein the collecting element (26) has openings, slots and / or perforations for the flow of air. [5] Device according to one of the preceding claims, wherein the collecting element (26) can be adjustably arranged in the region of the second end face (34) of the housing (12), wherein in particular the air flow introduced in the region of the second end face (34) of the housing (12) can be adjusted by the adjustability of the collecting element (26). [6] Device according to one of the preceding claims, wherein the housing (12) has a lateral recess for at least partially accommodating the combustion chamber (18), the extraction unit (20) and the collecting unit (22), wherein in particular the passage (24) is arranged adjacent to a wall of the housing (12) opposite the recess. [7] Device according to one of the preceding claims, wherein the collecting unit (22) is designed to be displaceable, in particular in the horizontal direction, wherein in particular the cross section of the passage (24) is adjustable by the displacement of the collecting unit (22). [8] Device according to one of the preceding claims, wherein the flame guide (30) is at least partially transparent, wherein in particular the flame guide (30) consists of heat-resistant glass, in particular borosilicate glass, and is arranged at its lower end at least partially within the housing (12). [9] Device according to one of the preceding claims, wherein a first grid structure (28) is arranged between the combustion chamber (18) and the collecting unit (22), wherein in particular a second grid structure (36) is arranged between the combustion chamber (18) and the extraction unit (20). [10] Device according to one of the preceding claims, wherein the collecting element (26), the collecting unit (22), the combustion chamber (18) and the extraction unit (20) are arranged in the housing (12) in such a way that the air flow is introduced into the housing (12) at least via the second end face (34) and is guided via the passage (24) around the end face of the collecting unit (22) into the combustion chamber (18) and additionally on the outside along the extraction unit (20) in the direction of the flame guide (30).

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