EP2902707B1 - Firewood oven - Google Patents

Description

FIELD OF THE INVENTION

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

BACKGROUND OF THE INVENTION

There are generally known wood-burning stoves which, for example, can also be set up as stoves in living rooms. So-called firewood is also used as fuel in such stoves.

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

To ignite the firewood in firewood stoves, it is known to use easily combustible materials, such as paper or small pieces of wood, wood chips or the like, or else prefabricated ignition aids. A user typically places these materials by hand in the logs located 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 log during its duration. However, if the user arranges the material unfavorably, if he uses too little material, wrong material, or if the fireplace is cold, if the chimney draft is bad or the weather is bad or if he makes another mistake, the firewood can fail to ignite.

EP 1 347 240 A1 discloses a firewood furnace with a device for automatically igniting firewood according to the preamble of claim 1. The ignition device is installed in the firewood furnace. The automatic ignition device comprises a container for holding wood pellets, which is arranged below a firing grate, on which logs rest. The pellets received in the container can be ignited via an adjacent hot air device, which in turn fires up the logs lying above them.

US 1,048,372 A. discloses an automatic ignition device for igniting matches to light a stove. The disclosed ignition device consists of a plate on which matches are clamped and can be ignited via an electrical heating wire which serves as an ignition device. This ignition device can be placed in a kitchen stove and removed again; Both the ignition device, namely the heating wire, and the ignition medium receptacle are combined on it. The object of the present invention is to provide an improved firewood furnace in which the ignition of firewood is simplified.

SUMMARY OF THE INVENTION

In a first aspect, the present invention provides a firewood furnace according to the subject matter of independent claim 1. Another aspect of the invention relates to such a log wood stove, which contains an ignition means. Preferred embodiments of the invention result from the dependent claims, the accompanying drawing and the following description.

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.

Exemplary embodiments of the invention will now be described by way of example and with reference to the accompanying drawing, in which:

• Fig. 1 an embodiment of a firewood furnace illustrated in a three-dimensional sectional view;
• Fig. 2 the firewood stove from Fig. 1 illustrated in a further view so that an ignition means receptacle and an ignition source of the log wood stove according to the invention are visible;
• Fig. 3 the firewood stove from Fig. 1 illustrated with the detonator holder pulled out and an ash drawer; and
• Fig. 4 an igniter of the firewood stove from Fig. 1 illustrated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the 1 to 3 is an embodiment of a firewood stove 1 and in Fig. 4 is illustrates an ignition device in accordance with the present invention. Before a detailed description follows, general explanations of the exemplary embodiments of the invention and their advantages follow.

The exemplary embodiments relate to a firewood furnace which comprises a combustion chamber for burning firewood. The combustion chamber is designed so that it can hold at least one piece of log. Firewood is typically designed as split wood from a tree trunk and has, for example, a length of approximately 25-33 cm, without the present invention being restricted thereto.

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

The firewood furnace further comprises an ignition means receptacle, which is arranged below the firing grate and is designed to receive an ignition means. The ignition device receptacle can have a flat, flat area on which the ignition device can be placed. The ignition means receptacle can also be positioned so that it is at least partially arranged below the openings of the firing grate. The ignition device receptacle can have a circular, elliptical, square or other geometry. In addition, it can be designed and arranged in such a way that the ignition means which receives it is arranged below the openings of the firing grate. The detonator receptacle can also have a circumference that prevents the detonator from falling from the flat receptacle area. In addition, the firewood furnace comprises an ignition device which is designed to automatically ignite the ignition means received by the ignition means receptacle. The ignition device can be operated electrically, as will also be explained further below, and heats the ignition means to such an extent that it ignites. The ignition device can be activated by operating a switch, but also by setting a start time, by receiving an external control signal or the like.

As a result of the arrangement of the ignition agent receptacle below the firing grate or below the openings of the firing grate, flames of the ignited ignition agent can rise up through the openings of the firing grate and ignite the firewood lying on the firing grate. Since the ignition device automatically ignites the ignition agent, the firewood in the combustion chamber also ignites automatically.

The ignition device receptacle can also be designed in such a way that it can hold a certain minimum amount of ignition device, so that a reliable ignition of Firewood is guaranteed in the combustion chamber. In addition, the ignition agent receptacle can be designed to be removable from the firewood furnace, as will be explained in more detail with reference to the following exemplary embodiments.

Basically, all flammable materials can be used as ignition means, e.g. wood chips, wood pellets or other vegetable substances such as rice straw and the like provided with wax or paraffin. However, fuels provided with paraffin or kerosene can also be used as ignition means, or else liquid fuels, such as ethanol or the like. Such fuels can also be used in the form of a fuel paste or a fuel gel. Depending on the type of ignition means, the ignition means receptacle can also be designed in a suitable manner for the respective ignition means used.

The ignition means can also be composed of different materials. It can also be divided into areas so that e.g. Areas which are flammable at a lower temperature can be arranged closer to the ignition device than areas which are flammable at a higher temperature. Since materials which are flammable at a higher temperature generally have a longer burning time, such areas of the ignition means can be arranged in a targeted manner below the openings of the firing grate. Rapid ignition and a long-lasting burning time of the ignition agent guarantee a quick and safe ignition of the logs.

In some exemplary embodiments, the log wood stove further has an ash receiving device which is designed as an ash drawer, ash box or as another container suitable for holding combustion residues. The ignition agent receptacle is preferably arranged between the ash receiving device and the firing grate. In addition, the ignition means receptacle can have openings. For example, combustion residues can thus fall from the combustion of the ignition agent through the openings in the ignition agent receiver into the ash receiving device. In addition, combustion residues from the combustion of the firewood can fall through the openings of the firing grate and then continue to fall through the openings of the ignition means receptacle underneath.

The ignition device is designed as an electrically activatable ignition source, which is an electrically operable heating element, an electrically operable piezo element generates a spark and ignites a gas, or have other means which are suitable for generating temperatures which allow the igniter to ignite. The heating element can be an electric rod heater, an electric tube heater or the like. The heating element generates a temperature at which the igniter is ignited. The heating element can direct the heat radiation generated during operation in the direction of the ignition agent receptacle and the ignition agent received thereon, so that the ignition agent is heated until it ignites.

The ignition device can also have an electrically operable fan motor, which can be configured together with the heating element as a hot-air dryer or can specifically allow air that is heated by the heating element to flow in the direction of the ignition agent receptacle.

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

The firewood furnace has an area which is arranged below the firing grate and is designed to receive the ignition agent receptacle. The area or igniter receiving area can be a space below the grate in which the igniter receptacle can be arranged. The area can be an independent chamber, or it can only be created by the separation by the firing grate from the combustion chamber in the interior of the furnace.

The detonator holder is designed as a pan or drawer that can be pushed into and removed from the area. The ignition device holder for an ignition process can thus simply be removed from the firewood furnace, the ignition device placed on it and the ignition device holder brought back into position in the ignition device reception area. In addition, the Detonator holder can be removed for cleaning.

The area of the log stove can also have a bottom, e.g. have a bottom with openings on which the ignition agent receptacle is arranged, so that combustion residues can fall through the openings into the ash receiving device. For example, by shaking the ignition agent receptacle in the firewood furnace, combustion residues can fall through the openings of the ignition agent receptacle and the openings in the bottom of the area into the ash receiving device.

Guide elements or the like can also be arranged in the igniter receiving area, which position the igniter receptacle correspondingly below the firing grate and, if necessary, support a translatory movement of the igniter receptacle for removal from or receipt in the firewood furnace. The guide elements can, for example, be fastened to the underside of the firing grate, so that the ignition agent receptacle is arranged above the ash receiving device, the ignition agent receptacle and the ash receiving device being located together in the area below the firing grate. The guide elements can be designed as rails, into which corresponding elements of the ignition means receptacle engage, so that the ignition means receptacle is held by the guide elements.

In some exemplary embodiments, the logs are formed by a housing which has an interior, the interior being divided into an upper region and a lower region by the firing grate. The upper area of the interior forms the combustion chamber, and the ignition device receptacle and the ash receptacle are arranged in the lower area below the firing grate. The ash receiving device can e.g. rest on the floor of the lower interior or it can be arranged below an opening in the floor of the lower interior.

A fan or the like can also be arranged in the ignition device receiving area, which distributes hot air generated by the ignition device in the area and thus supports the ignition of the ignition device on the ignition device receiving device.

A plurality of ignition means receptacles or a plurality of ignition means can also be provided on one ignition means receptacle and also at other points in the area Recording the ignition agent holder and / or be arranged in the combustion chamber.

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

A loading device can also be provided in or on the firewood furnace, which is designed to automatically load the ignition means receptacle with ignition means. For this purpose, a slide, a conveyor belt, a screw conveyor or the like can be provided, which transports ignition means from the ignition agent magazine to the ignition agent receptacle.

As stated above, the ignition device can be designed to ignite the ignition means on the basis of a time specification and / or to ignite the ignition means in response to the receipt of an external control signal. For this purpose, the ignition device can have a control, an operating element and / or an interface.

The controller can have a microprocessor and a non-volatile memory in which, for example, a time entry by a user or the like can be stored. The controller can be set up to control the ignition source, which can have a heating element, a fan motor, a hot-air dryer or the like, as explained above, and / or the charging device. The control element can have an input field with buttons and the like, with the aid of which time specifications can be entered, so that a point in time at which the ignition device is intended to ignite the ignition means can be entered. 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 designed 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 can e.g. generated by email, SMS, via an app on a tablet PC, smartphone or the like and transmitted to the controller via the interface.

Coming back to the 1 to 3 An embodiment of a firewood furnace 1 is shown there.

The firewood furnace 1 has an interior with a combustion chamber 2, on the bottom of which a firing grate 3 is arranged. The interior is formed by four walls 4a-d, a floor 4e and a ceiling (not shown). The combustion chamber 2 is delimited on the four sides with 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, a support 5a or 5b is arranged, on which the firewood furnace 1 is set up. The bottom of the combustion chamber 2 is formed by the grate 3.

The firing grate 3 has openings 3a in a centrally arranged area, which are designed as openings and extend from the top of the firing grate 3 to the bottom.

In the interior of the firewood furnace 1, an area 6 for an ignition means receptacle 10 is provided below the firing grate 3. The area 6 is separated from the combustion chamber 2 by the firing grate 3. The area 6 is accessible from the outside through rectangular openings 6a and 8 in the front wall 4a. Otherwise, the area 6 is delimited on the top by the firing grate 3, on the sides by the walls 4a-d of the log wood stove 1 and below by the floor 4e of the interior of the log wood stove 1.

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

Two guide elements 12a and 12b are also attached to the underside of the firing grate 3. The guide elements 12a and 12b extend from the front wall 4a to the rear wall 4c and are formed parallel to one another and parallel to the side walls 4b and 4d. The guide elements 12a and 12b are also arranged at a distance from one another such that they can guide the ignition means receptacle 10. The guide elements 12a and 12b are designed as rails in which the ignition means receptacle 10 can engage.

The ignition device receptacle 10 is designed as a pan and has a border 13 which is circular in shape and is attached to a pan base 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 a center inside the border 13 openings 14 so that the combustion residues (charcoal, ash, ...) fall into the ash tray 7 below.

The distance between the guide elements 12a and 12b is adapted to the width of the pan base 16, so that the in the Fig. 3 The left and right edge of the pan base 16 shown can engage in the guide elements 12a and 12b, so that the guide elements 12a and 12b hold the ignition means receptacle 10. A handle 17 is attached to the border 13, on which the ignition means receptacle 10 can be taken and removed through the opening 6a of the area 6. In addition, the ignition device receptacle 10 can be shaken back and forth on the handle 17 in order to shake combustion residues that have collected on the pan bottom 16 through the openings 14, so that the combustion residues fall into the ash drawer 7.

An ignition means 11 can be arranged on the pan base 16 in the ignition means receptacle 10, as is exemplarily shown in FIG Fig. 2 is shown. There, a circular ignition means 11 is arranged in the ignition means receptacle 10, the diameter of which is designed such that it is surrounded by the border 13 and is thus held in the border 13. The ignition means 11 has an outer circular area 11a with a material that is easily flammable and an inner circular area 11b with a material that has a long burning time.

The ignition means 11 is arranged in such a way that a flame which arises when it is burned extends through the openings 3a of the grate 3 and thereby ignites firewood which is arranged above the openings 3a on the grate 3.

To ignite 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. In this example, the ignition source 9 is designed as a hot air dryer and allows hot air to flow through an opening 15 in the border 13, which ignites the ignition means 11. It can be activated by pressing a switch or control element.

As in Fig. 4 is shown, the firewood furnace 1 comprises, in a further exemplary embodiment, an ignition device 20 which has a controller 21 for controlling the ignition source 9, a communication interface 22 and an operating 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 that 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 into the Is blown inside the ignition device receptacle 10 and there the ignition device 11 is heated until it ignites. The heating element 24 and the fan motor 25 are arranged accordingly 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 it is designed to control the ignition source 9. The ignition source 9 can be activated directly via the control element 23 or it can e.g. a time is entered at which the ignition device 20 is to ignite the ignition means 11 at a predetermined point in time. The controller 21 stores this data in its memory. In addition, the controller 21 can receive external control signals via the interface 22, by means of which the controller 21 activates the ignition source 9 immediately or carries out a time programming of the ignition process. Such control signals can be sent, for example, via SMS, email, or from external programs, e.g. Apps originate that run on external devices, such as a (tablet) PC, smartphone or the like. The interface 22 of the controller 21 can receive data here both wirelessly and by wire.

Claims (11)

1. Firewood oven, comprising:

   a combustion chamber (2) for burning firewood;

   a combustion grate (3) with openings (3a), which is arranged on an underside of the combustion chamber (2) and is intended for receiving the firewood;

   an igniting means receptacle (10), which is accommodated in a region (6) underneath the combustion grate (3) and is designed for receiving an igniting means (11), wherein the igniting means receptacle has openings in the bottom in order that combustion remains can fall through; and

   an igniting device (9, 20), which is designed for the automatic ignition of the igniting means (11) received by the igniting means receptacle (10), wherein the igniting device (10) is designed as an electrically activatable ignition source, in order to heat the igniting means located in the igniting means receptacle to such an extent that it ignites;

   characterized in that

   the igniting means receptacle (10) is designed as a tray or drawer, which can be pushed into the region (6) and removed from it, wherein the igniting means receptacle has a peripheral surround (13) with an opening (15), which is arranged adjacent to the igniting device (9, 20), in order to ignite the igniting means (11).
2. Firewood oven according to Claim 1, also having an ash receiving device (7), wherein the igniting means receptacle (10) is arranged between the ash receiving device (7) and the combustion grate (3).
3. Firewood oven according to one of the preceding claims, wherein the igniting device (9, 20) has an electrically operable heating element (24).
4. Firewood oven according to one of the preceding claims, wherein the igniting device (9, 20) has an electrically operable fan motor (25).
5. Firewood oven according to either of Claims 3 and 4, wherein the igniting device (9, 20) is designed to produce a stream of hot air and to direct the stream of hot air produced onto the igniting means (11) received by the igniting means receptacle (10) .
6. Firewood oven according to Claim 1, wherein guiding elements (12a, 12b), into which the igniting means receptacle (10) can be pushed, are fastened on the underside of the combustion grate (3).
7. Firewood oven according to one of the preceding claims, wherein the igniting device (9, 20) is designed to ignite the igniting means (11) on the basis of a time presetting.
8. Firewood oven according to one of the preceding claims, wherein the igniting device (9, 20) is designed to ignite the igniting means (11) in response to the reception of an external control signal.
9. Firewood oven according to Claim 8, wherein the igniting device (9, 20) is designed to ignite the igniting means (11) on the basis of a time presetting.
10. Firewood oven according to one of the preceding claims, wherein the igniting means receptacle (10) contains igniting means (11) of differently composed materials.
11. Firewood oven according to Claim 10, wherein the igniting means (11) is divided into regions that can ignite at a lower temperature and can be arranged closer to the igniting device (9, 20) than regions that can be ignited at a higher temperature.

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