A COMBI STOVE AND USE OF A COMBI STOVE

Abstract

Disclosed is a combi stove (1) arranged for combusting both logs and granular material. The combi stove (1) comprises a common combustion chamber (2) arranged so that both the logs and the granular material may be combusted in the common combustion chamber (2). The combi stove (1) further comprises ash collecting means (3) arranged under the combustion chamber (2) and a front aperture (4) through which logs may be placed in the combustion chamber (2). Also the combi stove (1) includes a granular material combustion area (5) arranged in the combustion chamber (2), wherein the granular material combustion area (5) comprises a bottom combustion surface (6) including bottom airflow apertures (7) arranged to enable an airflow to the granular material during a combustion of the granular material in the granular material combustion area (5), wherein the granular material combustion area (5) is at least partly surrounded by a granular material area sidewall (8) comprising sidewall airflow apertures (9) arranged to enable an airflow to flue gasses generated during a combustion of the granular material in the granular material combustion area (5), and wherein at least a part of the granular material area sidewall (8) is releasable from the granular material combustion area (5). Furthermore, a use of a combi stove (1) is disclosed.

Claims

1. A combi stove arranged for combusting both logs and granular material, said combi stove comprising, a common combustion chamber arranged so that both said logs and said granular material may be combusted in said common combustion chamber, ash collector arranged under said combustion chamber, a front aperture through which logs may be placed in said combustion chamber, a granular material combustion area arranged in said combustion chamber, wherein said granular material combustion area comprises a bottom combustion surface including bottom airflow apertures arranged to enable an airflow to said granular material during a combustion of said granular material in said granular material combustion area, wherein said granular material combustion area is at least partly surrounded by a granular material area sidewall comprising sidewall airflow apertures arranged to enable an airflow to flue gasses generated during a combustion of said granular material in said granular material combustion area, and wherein at least a part of said granular material area sidewall is releasable from said granular material combustion area.

2. The combi stove according to claim 1, wherein said common combustion chamber comprises a log combustion area and wherein said log combustion area is arranged between said front aperture and said granular material combustion area.

3. The combi stove according to claim 2, wherein said log combustion area is separated at least partly from said ash collector by means of a grate.

4. The combi stove according to claim 3, wherein said grate and said bottom combustion surface are substantially level.

5. The combi stove according to claim 1, wherein a bottom part of said releasable part of said granular material area sidewall is arranged to engage said bottom combustion surface to substantially fix said releasable part of said granular material area sidewall against displacement in a horizontal plane.

6. The combi stove according to claim 1, wherein said releasable part of said granular material area sidewall is arranged to surround at least 20% of said granular material combustion area.

7. The combi stove according to claim 1, wherein said sidewall airflow apertures are arranged at a top edge of said granular material area sidewall.

8. The combi stove according claim 1, wherein said combi stove comprises granular material feeder arranged for feeding granular material up into said granular material combustion area from beneath said granular material combustion area during a combustion of said granular material in said granular material combustion area.

9. The combi stove according to claim 1, wherein said combi stove comprises a granular material storage arranged beneath said combustion chamber.

10. The combi stove according to claim 1, wherein said combi stove comprises a flue arranged above said combustion chamber.

11. The combi stove according to claim 1, wherein said combi stove comprises airflow generator for actively generating an airflow through said bottom airflow apertures and said sidewall airflow apertures at least during a combustion of said granular material.

12. The combi stove according to claim 1, wherein a top edge of said granular material area sidewall is formed with a non-uniform height over said bottom combustion surface.

13. The combi stove according to claim 1, wherein said granular material is wood pellets.

14. Use of the combi stove according to claim 1 for combusting wood logs and wood pellets.

15. The combi stove according to claim 1, wherein said releasable part of said granular material area sidewall is arranged to surround preferably at least 30% of said granular material combustion area.

16. The combi stove according to claim 1, wherein said releasable part of said granular material area sidewall is arranged to surround most preferred at least 45% of said granular material combustion area.

Description

FIGURES

[0042] The invention will be described in the following with reference to the figures in which

[0043] FIG. 1 illustrates a combi stove shown without front cover, as seen in perspective,

[0044] FIG. 2 illustrates a combi stove shown without back cover, as seen in perspective,

[0045] FIG. 3 illustrates a combi stove shown without back cover, as seen from the back,

[0046] FIG. 4 illustrates a cross section through the middle of a combi stove, as seen from the side,

[0047] FIG. 5 illustrates a granular material combustion area, as seen in perspective,

[0048] FIG. 6 illustrates the releasable part of the granular material area sidewall, as seen from in perspective,

[0049] FIG. 7 illustrates a cross section through the middle of a granular material combustion area, as seen from the side, and

[0050] FIG. 8 illustrates a granular material combustion area, as seen from the top.

DETAILED DESCRIPTION

[0051] FIG. 1 illustrates a combi stove 1 shown without front cover, as seen in perspective, FIG. 2 illustrates a combi stove 1 shown without back cover, as seen in perspective, FIG. 3 illustrates a combi stove 1 shown without back cover, as seen from the back and FIG. 4 illustrates a cross section through the middle of a combi stove 1, as seen from the side.

[0052] In this embodiment the combi stove 1 comprises a common combustion chamber 2 in which both logs and granular material can be combusted.

[0053] In this embodiment granular material is combusted in a granular material combustion area 5, which in this case is arranged at the back of the common combustion chamber 2 so that a log combustion area 11 is formed in front ofand partly aroundthe granular material combustion area 5. However, in another embodiment the granular material combustion area 5 could be placed elsewhere in the common combustion chamber 2, such as a side, at the front, above or under the log combustion area 11 and/or the granular material combustion area 5 could be placed in more locations in the common combustion chamber 2. And physically separating the granular material combustion area 5 from the log combustion area 11 does not limit the respective combustion processes to the respective arease.g. logs could easily be placed (or fall onto) the granular material combustion area 5 so that log combustion would also take place in the granular material combustion area 5.

[0054] In this embodiment flue means 17 is arranged above said common combustion chamber 2 but in another embodiment the flue means 17 could be arranged next to or even under the common combustion chamber 2.

[0055] In this embodiment ash collecting means 3 in the form of an ash draw is arranged under the combustion chamber 2 so that ash generated in the combustion processes in the common combustion chamber 2 fall down into the ash collecting means 3 by means of gravitye.g. aided by manual sweeping or scraping.

[0056] In this embodiment the combustion chamber 2 and the ash collecting means 3 areat least partlyseparated by a grate 12 ensuring that ash may pass while logs and other larger objects remains in the combustion chamber 2.

[0057] In this embodiment the combi stove 1 is also provided with a front aperture 4 through which the combustion chamber 2 may be accessed. The front aperture is so large that logs can pass and thereby be placed in the combustion chamber 2. The front aperture is also used for accessing the granular material combustion area 5 and the log combustion area 11 during cleaning, maintenance, repair and other.

[0058] In this embodiment the combi stove 1 is further provided with a door 19 that can be opened or closed by a user and in this embodiment the door 19 is provided with a window 20 to allow that the combustion processes in the combustion chamber 2 may be seen even when the door 19 is closed.

[0059] In this embodiment the combi stove comprises a granular material storage 16 arranged entirely beneath the combustion chamber 2 and entirely beneath the ash collecting means 3. However, in another embodiment only parts of the granular material storage 16 would be arranged beneath the combustion chamber 2 and/or the granular material storage 16 or parts of the granular material storage 16 could also or instead be arranged next to or above the common combustion chamber 2.

[0060] In this embodiment the combi stove 1 also comprises granular material feeding means 15 arranged for feeding granular material up from the granular material storage 16 and up into the granular material combustion area 5 from beneath.

[0061] In this embodiment the granular material feeding means 15 comprises a curving auger 21 arranged to transport the granular material from the bottom of the granular material storage 16 and up near the common combustion chamber 2 where the granular material falls through a down duct 23 and further into an upper auger 22 arranged to feed the granular material the rest of the way up into the common combustion chamber 2. However, it is obvious to the skilled person that the granular material feeding means 15 can be arranged in numerous other way by means of numerous other technical means.

[0062] In this embodiment the combi stove 1 is also provided with airflow generating means 18 arranged for actively generating an airflow up through the bottom airflow apertures 7 (see FIG. 7) and the sidewall airflow apertures 9 (see FIG. 6) during the combustion of granular material in the granular material combustion area 5.

[0063] In this embodiment the combi stove 1 is formed as a vertical cylinder but it is obvious that in another embodiment the stove 1 could also or instead have another more or less varying cross sectional shape such as triangular, square, rectangular, oval, polygonal or other or any combination thereof.

[0064] It should be noticed that any orientation reference made throughout this applicationsuch as top, bottom, up, down, side etc.in made is relation to the stove 1 during normal orientation and usei.e. when the stove 1 is arranged to efficiently function as a device for emitting heat generated by a combustion process running inside the stove 1.

[0065] FIG. 5 illustrates a granular material combustion area 2, as seen in perspective, FIG. 6 illustrates the releasable part 10 of the granular material area sidewall 8, as seen from in perspective, FIG. 7 illustrates a cross section through the middle of a granular material combustion area 5, as seen from the side and FIG. 8 illustrates a granular material combustion area 5, as seen from the top.

[0066] In this embodiment the granular material combustion area 5 is formed integrally with the grate 12 but in another embodiment these parts could be formed completely separate.

[0067] In this embodiment the granular material combustion area 5 comprises a bottom combustion surface 6 having a number of bottom airflow apertures 7 arranged to enable an airflow to the granular material during the combustion process inside the granular material combustion area 5.

[0068] In this embodiment the granular material combustion area 5 is completely surrounded by a granular material area sidewall 8 which together with the bottom combustion surface 6 forms a burning pot being wider at the bottom than at the top. However, in another embodiment the granular material area sidewall 8 and the bottom combustion surface 6 could be formed in numerous other ways.

[0069] In this embodiment a releasable front part 10 of the granular material area sidewall 8 is formed separate and releasable from the granular material combustion area 5 and the rest of the granular material area sidewall 8 so that the granular material combustion area 5, the bottom combustion surface 6 and other may more easily be accessed.

[0070] In this embodiment the bottom combustion surface 6 is substantially level with the grate 12 so that when the releasable part 10 of the granular material area sidewall 8 is removed from the granular material area sidewall 8 the bottom combustion surface 6 can easily be cleaned for slag, ash and other and the waste material can easily be swept or pushed out on the grate 12 where it will fall down to the ash collecting means 3.

[0071] In this embodiment a bottom part 13 of the releasable part 10 of the granular material area sidewall 8 is provided with a protruding edge arranged to engage a corresponding recess in the bottom combustion surface 6 so that the releasable part 10 of the granular material area sidewall 8 is substantially fixed against displacement in a horizontal plane but can freely be pulled upwards manually and thereby be removed to enable access to the bottom combustion surface 6. However, in another embodiment the releasable part 10 of the granular material area sidewall 8 could be secured against horizontal displacement in relation to the bottom combustion surface 6 in numerous other ways e.g. by means of guide spindles, matching geometry, screws, clamps or other or any combination thereof.

[0072] In this embodiment the back part of the granular material area sidewall 8 is formed integrally with the bottom combustion surface 6 so that only around 70% of the bottom combustion surface 6 can be released from the bottom combustion surface 6. But in another embodiment only 60%, 50%, 40% or even less of the granular material area sidewall 8 would be releasable from the bottom combustion surface 6 or 80%, 90% or even 100% of the granular material area sidewall 8 could be releasable from the bottom combustion surface 6.

[0073] As best seen in FIG. 6 the releasable part 10 of the granular material area sidewall 8 is in this embodiment provided with sidewall airflow apertures 9 arranged to enable an airflow to the passing flue gasses generated during the combustion process on the bottom combustion surface 6. In this embodiment the sidewall airflow apertures 9 are arranged at the sides along the top edge 14 of the granular material area sidewall 8 but in another embodiment the apertures 9 could also or instead be arranged at the front, further down towards the bottom combustion surface 6 or elsewhere.

[0074] As best seen in FIGS. 6 and 7 the fixed back part of the granular material area sidewall 8 is in this embodiment also provided with sidewall airflow apertures 9 and in this embodiment the air flow is guided from the airflow generating means 18 up into the fixed back part of the granular material area sidewall 8 and from there out of the sidewall airflow apertures 9 in the fixed back part and also further on into the releasable part 10 of the granular material area sidewall 8 and thus also out of the sidewall airflow apertures 9. However, it in another embodiment the air flow could be distributed in numerous other ways.

[0075] In this embodiment of the invention the top edge 14 of the granular material area sidewall 8 is provided with top edge protrusions 28 ensuring that the top edge 14 is provided with a non-uniform height over the bottom combustion surface 6 so that a log or similar accidentally placed on the granular material combustion area 5 will not hinder or quench the combustion process in the granular material combustion area 5.

[0076] The invention has been exemplified above with reference to specific examples of combi stove 1, combustion chamber 2, granular material combustion area 5 and other. However, it should be understood that the invention is not limited to the particular examples described above but may be designed and altered in a multitude of varieties within the scope of the invention as specified in the claims.

LIST

[0077] 1. Combi stove

[0078] 2. Combustion chamber

[0079] 3. Ash collecting means

[0080] 4. Front aperture

[0081] 5. Granular material combustion area

[0082] 6. Bottom combustion surface

[0083] 7. Bottom airflow apertures

[0084] 8. Granular material area sidewall

[0085] 9. Sidewall airflow apertures

[0086] 10. Releasable part of granular material area sidewall

[0087] 11. Log combustion area

[0088] 12. Grate

[0089] 13. Bottom part of releasable part

[0090] 14. Top edge of granular material area sidewall

[0091] 15. Granular material feeding means

[0092] 16. Granular material storage

[0093] 17. Flue means

[0094] 18. Airflow generating means

[0095] 19. Door

[0096] 20. Window

[0097] 21. Curving auger

[0098] 22. Upper auger

[0099] 23. Down duct

[0100] 24.

[0101] 25.

[0102] 26.

[0103] 27.

[0104] 28. Top edge protrusion