EP2902707A2 - Firewood oven - Google Patents

Abstract

The invention relates to a log wood stove with: a combustion chamber (2) for burning firewood; a grate (3) having openings (3a) disposed on an underside of the combustion chamber (2) and intended to receive the billet; a Zündmittelaufnahme (10), which is arranged below the combustion grate (3) and for receiving an ignition means (11) is formed; and an ignition device (9, 20) which is designed to automatically ignite the ignition means (11) received by the ignition means receptacle (10).

Description

FIELD OF THE INVENTION

The present invention relates generally to a log burning stove having an automatic ignition device.

BACKGROUND OF THE INVENTION

There are generally known wood stoves that are, for example. Set up as a stove in living rooms. In such stoves comes as fuel and so-called firewood for use.

Known log wood stoves usually have a combustion chamber which is dimensioned so that several logs burn in it. To control the combustion, for example, air valves are provided which control the primary air and secondary air supply.

To light the firewood in firewood ovens, it is known to use flammable materials, such as paper or small pieces of wood, wood chips or the like, or prefabricated firelighters. These materials are typically manually laid by a user to the logs in the combustion chamber. The user ignites the materials by hand, e.g. with a match or a lighter, and the burning material ignites the firewood during its burning time. However, if the user arranges the material unfavorably, if he uses too little material, wrong material, or if the chimney is cold, if there is a bad chimney draft or unfavorable weather conditions, or if he makes another mistake, the ignition of the billets may fail.

The object of the present invention is to provide an improved logwood furnace in which the ignition of logs is simplified.

SUMMARY OF THE INVENTION

In one aspect, the present invention provides a logwood stove comprising: a combustion chamber for burning logs; a grate with openings, which is arranged on an underside of the combustion chamber and provided for receiving the firewood; a Zündmittelaufnahme, below the combustion grate arranged and adapted to receive an ignition means; and an igniter configured to automatically ignite the ignition means received by the ignition means receptacle.

Further aspects and features of the present invention will become apparent from the dependent claims, the accompanying drawings and the following description of preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWING

• Fig. 1 ein Ausführungsbeispiel eines Scheitholzofens in einer dreidimensionalen Schnittansicht veranschaulicht;
• Fig. 2 den Scheitholzofen von Fig. 1 in einer weiteren Ansicht veranschaulicht, sodass eine Zündmittelaufnahme und eine Zündquelle des erfindungsgemäßen Scheitholzofens sichtbar sind;
• Fig. 3 den Scheitholzofen von Fig. 1 mit herausgezogener Zündmittelaufnahme und einer Aschelade veranschaulicht; und
• Fig. 4 eine Zündvorrichtung des Scheitholzofens von Fig. 1 illustriert.

Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which:

• Fig. 1 an embodiment of a logwood stove in a three-dimensional sectional view illustrated;
• Fig. 2 the log stove of Fig. 1 illustrated in another view, so that a Zündmittelaufnahme and a source of ignition of the logwood furnace according to the invention are visible;
• Fig. 3 the log stove of Fig. 1 illustrated with withdrawn Zündmittelaufnahme and an ashtray; and
• Fig. 4 an ignition device of the log stove of Fig. 1 illustrated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the Fig. 1 to 3 is an embodiment of a logwood stove 1 and in Fig. 4 an ignition device in accordance with the present invention is illustrated. Before a detailed description follows first general explanations to the embodiments of the invention and their advantages.

The embodiments relate to a log burning stove comprising a combustion chamber for burning firewood. The combustion chamber is designed so that it can accommodate at least one firewood. Log is typically designed as fissure wood of a tree trunk and has, for example, a length of about 25-33 cm, without the present invention being limited thereto.

The firewood oven includes a grate with openings at the bottom arranged the combustion chamber and is provided for receiving the billets. The logs can be laid by a user on the combustion grate in the combustion chamber for combustion. In some embodiments, primary air flows from below through the openings of the combustion grate into the combustion chamber. In addition, combustion residues, such as charcoal, ash or the like, may fall through the openings into an ash receiving means located thereunder and be disposed of.

The firewood oven further includes an ignition means receptacle disposed below the firing grid and adapted to receive an ignition means. The Zündmittelaufnahme may have a flat, flat area on which the ignition can be placed. The Zündmittelaufnahme may also be positioned so that it is at least partially disposed below the openings of the combustion grate. The Zündmittelaufnahme can have a circular, elliptical, quadrangular or other geometry. In addition, it may be designed and arranged such that the ignition means, which it receives, is arranged below the openings of the combustion grate. The firing receptacle may also have a boundary circumferentially that prevents the firing means from falling from the flat receiving area.

In addition, the log firing furnace comprises an ignition device, which is designed for automatically igniting the ignition means received by the Zündmittelaufnahme. The ignition device may be electrically operable, as will be explained below, and the ignition means so far heated that it ignites. The ignition device may be activated by operating a switch, but also by setting a start time, by receiving an external control signal, or the like.

By arranging the Zündmittelaufnahme below the combustion grate or below the openings of the combustion grate flames of the ignited ignition means can rise through the openings of the combustion grate up and ignite the logs lying on the combustion grate. Since the ignition device ignites the ignition means automatically ignited also located in the combustion chamber log so automatically.

The Zündmittelaufnahme may also be such that it can accommodate a certain minimum amount of ignition, so that a safe ignition of Log is guaranteed in the combustion chamber. In addition, the Zündmittelaufnahme be designed removable from the log stove, as will be explained in more detail with reference to the following embodiments.

As ignition means basically all combustible materials can be used, such as e.g. wax or paraffin-containing wood chips, wood pellets or other vegetable matter such as rice straw and the like. However, it is also possible to use paraffin or kerosene-fueled firing materials as ignition means, or even liquid firing agents, such as ethanol or the like. Such firing agents may also be used in the form of a fuel paste or a fuel gel. Depending on the type of ignition means and the Zündmittelaufnahme may be configured in a suitable manner for the respective Zündmitteleinsatz.

The ignition means may also be composed of different materials. It can also be divided into areas so that e.g. Areas that are flammable at a lower temperature may be located closer to the igniter than areas that are flammable at a higher temperature. Since materials that are flammable at a higher temperature, usually have a longer burning time, such areas of the ignition can be selectively located below the openings of the combustion grate. A rapid ignition and a long-lasting burning time of the ignition device guarantee a fast and safe ignition of the firewood.

In some embodiments, the logwood furnace further comprises an ash receiving device configured as an ash tray, ash box, or other suitable container for receiving combustion residues. The Zündmittelaufnahme is preferably arranged between the ash receiving device and the combustion grate. In addition, the Zündmittelaufnahme may have openings. Thus, for example, combustion residues from the combustion of the ignition means through the openings of the Zündmittelaufnahme can fall into the ash receiving device. In addition, combustion residues may also fall from the combustion of the billet through the openings of the combustion grate and then fall further through the openings of the underlying Zündmittelaufnahme.

The ignition device may comprise an electrically operable ignition source comprising an electrically operable heating element, an electrically operable piezoelectric element, the generates a spark and ignites a gas, or has other means capable of producing temperatures that allow ignition of the ignition means.

The heating element may be an electric rod heater, an electric tube heater or the like. The heating element generates a temperature with which the ignition means is ignited. The heating element may direct the heat radiation generated during operation in the direction of the ignition means receptacle and the ignition means received thereon so that the ignition means is heated until it ignites.

The ignition device may also comprise an electrically operable fan motor, which may be configured together with the heating element as a Heißluftföhn or air, which is heated by the heating element, selectively flow in the direction of Zündmittelaufnahme.

Accordingly, the igniter may be configured to generate a flow of hot air and to direct the generated hot air flow to the ignition means received by the ignition means receptacle. The ignition device may direct the flow of hot air from one direction to the ignition means receptacle and ignition means received thereon, while in other embodiments the ignition device directs the hot air flow from more than one direction to the ignition means receptacle and the ignition means received thereon.

The logwood furnace may further include an area disposed below the combustion grate and configured to receive the ignition means receptacle. The area or ignition means receiving area may be a space below the combustion grate, in which the Zündmittelaufnahme can be arranged. The area may be a separate chamber, or it may also arise only by the separation through the combustion grate of the combustion chamber in the interior of the furnace.

The Zündaufaufaufname may be formed as a pan or drawer or other container-like structure that can be inserted or inserted into the area and taken out of this or pulled-pulled. Thus, the Zündmittelaufnahme for an ignition process can be easily removed from the log stove, the ignition means placed and the Zündmittelaufnahme be brought back into the Zündmittelaufnahmebereich in position. In addition, the Zündmittelaufnahme be removed for cleaning.

The area of the logwood stove may also have a bottom, e.g. have a bottom with openings on which the Zündmittelaufnahme is arranged so that combustion residues can fall through the openings in the ash receiving device. For example, by jarring the ignition pickup in the log furnace, combustion debris may fall through the openings of the ignition pickup and the openings of the bottom of the area into the ash pickup device.

In the Zündmittelaufnahmebereich also guide elements or the like may be arranged, which position the Zündmittelaufnahme according to below the combustion grate and possibly support a translational movement of the Zündmittelaufnahme for removal from or inclusion in the log stove. The guide elements may for example be attached to the underside of the firing grid, so that the Zündmittelaufnahme is located above the ash receiver, wherein the Zündmittelaufnahme and the ash receiver are located together in the area below the grate. The guide elements may be formed as rails, engage in the corresponding elements of the Zündmittelaufnahme so that the Zündmittelaufnahme is held by the guide elements.

In some embodiments, the log is formed by a housing having an interior, the interior being divided by the firing grid into an upper area and a lower area. The upper region of the interior thereby forms the combustion chamber, and in the lower region below the combustion grate the Zündmittelaufnahme and the ash receiver are arranged. The ash receptacle may be e.g. rest on the bottom of the lower interior or it may be disposed below an opening in the bottom of the lower interior.

A fan or the like may also be disposed in the ignition means receiving area, distributing hot air generated by the ignition device in the area and thereby assisting ignition of the ignition means on the ignition means receptacle.

It can also be provided on a Zündmittelaufnahme several Zündmittelaufnahmen or more ignition means and at other points of the area for Recording the Zündmittelaufnahme and / or be arranged in the combustion chamber.

In addition, a magazine for ignition means may also be provided in or at the firewood oven, e.g. is arranged away from the combustion chamber to avoid ignition of the ignition means in the magazine. The ignition can be removed manually from the magazine and placed on the Zündmittelaufnahme.

It may be provided in or on the log wood also a charging device, which is adapted to automatically feed the Zündmittelaufnahme with ignition. For this purpose, a chute, a conveyor belt, a screw conveyor or the like may be provided which transports ignition means from the Zündmittelmagazin towards Zündmittelaufnahme.

As stated above, the ignition device may be configured to ignite the ignition means on the basis of a timing and / or to ignite the ignition means in response to receiving an external control signal. For this purpose, the ignition device may have a controller, an operating element and / or an interface.

The controller may include a microprocessor and a nonvolatile memory in which, for example, a time input of a user or the like may be stored. The controller may be configured to control the ignition source, which may include a heating element, a fan motor, a hot air blower, or the like, as set forth above, and / or to control the feeder. The operating element may have an input field with buttons and the like, with the aid of which time specifications can be input, so that a point in time at which the ignition device is to ignite the ignition device can be input. The control element can also be designed as a switch with which the ignition source can be switched on directly. In addition, the interface can be configured as a wireless (WLAN, mobile radio, such as GSM, UMTS, etc.) and / or a wired interface (network, ISDN, telephone line, etc.), via which external control signals can be received. External control signals may e.g. be generated by e-mail, text message, via an app of a tablet PC, smartphones or the like and transmitted to the controller via the interface.

Coming back to the Fig. 1 to 3 there is shown an embodiment of a log wood stove 1.

The log wood stove 1 has an interior with a combustion chamber 2, at the bottom of a combustion grate 3 is arranged. The interior space is formed by four walls 4a-d, a floor 4e and a ceiling (not shown). The combustion chamber 2 is bounded on the four sides by walls, namely with the front wall 4a, the rear wall 4c and two side walls 4b and 4d. On the side walls 4b and 4d, respectively, a support 5a and 5b is arranged, on which the log wood stove 1 is set up. The bottom of the combustion chamber 2 is formed by the combustion grate 3.

The grate 3 has in a centrally disposed region openings 3a, which are configured as openings and extend from the top of the burner grate 3 to the bottom through.

In the interior of the log firing furnace 1, a region 6 is provided for a Zündmittelaufnahme 10 below the combustion grate 3. The area 6 is separated by the combustion grate 3 from the combustion chamber 2. The area 6 is accessible from the outside through rectangular openings 6a and 8 in the front wall 4a. Otherwise, the area 6 is bounded at the top by the grate 3, on the sides by the walls 4a-d of the log wood stove 1 and below by the bottom 4e of the interior of the log wood stove first

In area 6, an ash tray 7 is provided on the bottom 4e, which is accessible through an opening 8 in the front wall 4a and can be removed from the area 6.

On the underside of the burner grate 3 also two guide elements 12a and 12b are attached. The guide members 12a and 12b extend from the front wall 4a to the rear wall 4c and are formed parallel to each other and parallel to the side walls 4b and 4d. The guide elements 12a and 12b are also spaced from each other so that they can lead the Zündmittelaufnahme 10. The guide elements 12a and 12b are formed as rails into which the Zündmittelaufnahme 10 can engage.

The Zündmittelaufnahme 10 is formed as a pan and has a border 13 which is circular and is mounted on a pan bottom 16. The pan bottom 16 is designed as a rectangular plate and the border 13 is arranged centrally on the pan bottom 16. The pan bottom 16 has centered inside the border 13 openings 14, so that the combustion residues (charcoal, ash, ...) fall into the underlying ash tray 7.

The distance of the guide elements 12 a and 12 b is adapted to the width of the pan bottom 16, so that in the Figure 3 shown left and right edge of the pan bottom 16 can engage in the guide elements 12a and 12b, so that the guide elements 12a and 12b hold the Zündmittelaufnahme 10. At the border 13, a handle 17 is attached, on which the Zündmittelaufnahme 10 can be removed and removed through the opening 6a of the area 6. In addition, on the handle 17, the Zündmittelaufnahme 10 are shaken back and forth to shake combustion residues that have accumulated on the pan bottom 16 through the openings 14 so that the combustion residues fall into the ashtray 7.

In the Zündmittelaufnahme 10, an ignition means 11 can be arranged on the pan bottom 16, as exemplified in Fig. 2 is shown. There, a circular ignition means 11 is arranged in the Zündmittelaufnahme 10, whose diameter is designed such that it is surrounded by the border 13 and thus held in the border 13. The ignition means 11 has an outer circular portion 11a with a material which is easily flammable and an inner circular portion 11b with a material having a long burning time.

The ignition means 11 is arranged so that a flame, which is formed during its combustion, extends through the openings 3a of the combustion grate 3 and thereby ignited logs, which is arranged above the openings 3a on the combustion grate 3.

For igniting the ignition means 11 or the outer region 11a of the ignition means 11, an ignition device in the form of an electrically activatable ignition source 9 is arranged adjacent to the border 13. The ignition source 9 is formed in this example as Heißluftföhn and can flow through an opening 15 in the border 13 hot air, which ignites the ignition means 11. It can be activated by pressing a switch or operating element.

As in Fig. 4 is shown, the log wood stove 1 comprises in another embodiment, an ignition device 20 having a controller 21 for controlling the ignition source 9, a communication interface 22 and a control element 23.

The ignition source 9 comprises a heating element 24 and a fan motor 25. The ignition source 9 is tubular with an opening which is arranged opposite the opening 15 in the border 13, so that hot air from the ignition source 9 out through the opening 15 of the border 13 in the Inside the Zündmittelaufnahme 10 is blown and there heats the ignition means 11 to ignite. The heating element 24 and the fan motor 25 are arranged correspondingly within the ignition source 9.

The controller 21 of the firewood furnace 1 according to the invention comprises a microprocessor and a non-volatile memory, and is designed to control the ignition source 9. In this case, via the operating element 23, the ignition source 9 can be activated directly or it can e.g. Enter a time at which the ignition device 20 is to ignite the ignition means 11 at a given time. The controller 21 stores this data in its memory. In addition, the controller 21 can receive via the interface 22 external control signals, by means of which the controller 21, the ignition source 9 is activated immediately or performs a time programming of the ignition process. Such control signals may, for example, via SMS, e-mail, or by external programs, e.g. Apps, which run on external devices, such as a (tablet) PC, smartphone or the like. The interface 22 of the controller 21 can receive data both wirelessly and by wire.

Claims (15)

Log furnace, comprising: a combustion chamber (2) for burning logs; a grate (3) having openings (3a) disposed on an underside of the combustion chamber (2) and provided for receiving the billet; an ignition receiving means (10) disposed below the combustion grate (3) and adapted to receive an ignition means (11); and an ignition device (9, 20) adapted to automatically ignite the ignition means (11) received by the ignition means receptacle (10). Log firing furnace according to claim 1, further comprising an ash receiving device (7), wherein the Zündmittelaufnahme (10) between the ash receiving means (7) and the combustion grate (3) is arranged. Log firing oven according to one of the preceding claims, wherein the Zündmittelaufnahme (10) has openings (14). Log wood stove according to one of the preceding claims, wherein the ignition device (9, 20) has an electrically activatable ignition source which can be activated by operating a switch or a control element. Log burning stove according to one of the preceding claims, wherein the ignition device (9, 20) has an electrically operable heating element (24). Log burning stove according to one of the preceding claims, wherein the ignition device (9, 20) has an electrically operable fan motor (25). Log firing furnace according to one of claims 5 or 6, wherein the ignition device (9, 20) is adapted to generate a hot air flow and to direct the generated hot air flow to the ignition means (11) received by the ignition means receptacle (10). Log firing furnace according to one of the preceding claims, further comprising a region (6) which is arranged below the combustion grate (3) and is adapted to receive the Zündmittelaufnahme (10). Log firing furnace according to claim 8, wherein the Zündmittelaufname (10) is designed as a pan or drawer, which can be inserted and removed from the area (6). Log firing furnace according to claim 8, wherein guide elements (12a, 12b) are fastened to the underside of the firing grate (3), into which the ignition means receptacle (10) can be inserted. A firewood oven as claimed in any one of the preceding claims, wherein the firing device (9, 20) is adapted to ignite the firing means (11) based on a timing. A firewood oven according to any one of the preceding claims, wherein the firing device (9, 20) is adapted to ignite the firing means (11) in response to receipt of an external control signal. A firewood oven according to claim 12, wherein the ignition device (9, 20) is adapted to ignite the ignition means (11) based on a timing. Ignition means for use in a log burning stove (1) according to any one of the preceding claims, wherein the ignition means (11) is composed of different materials. A primer according to claim 14, which is divided into regions which are flammable at a lower temperature and can be arranged closer to the igniter (9, 20) than regions which are flammable at a higher temperature.

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