EP3040618B1

EP3040618B1 - Stove with removable burning chamber

Info

Publication number: EP3040618B1
Application number: EP14200531.3A
Authority: EP
Inventors: Anne Jurjen Osinga; Merijn Hartog; Aart Gerardus De Heer; René MARTENS
Original assignee: Mimi Moto Holding BV
Current assignee: Mimi Moto Holding BV
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2017-08-23
Anticipated expiration: 2034-12-30
Also published as: CN107208898B; EP3040618B8; CN107208898A; EP3040618A1; WO2016107688A1

Description

The present invention relates to a stove which is suitable for heating and/or cooking.
Such a stove is generally known. Multi-fuel stoves are for example used in small dwellings, such as in developing countries where the same stove is generally used for cooking and heating purposes. These stoves have a central burning chamber within an outer shell and have air apertures for controlling the burning of generally solid fuel, like wood -pellets, chips or blocks- or remainders thereof, coals such as charcoal, brown coal or the like. When the burning is finished the remaining ash is removed from the burning chamber, usually by turning the stove and depositing the ash remains into a safe storage place.
US 2006/225724 A1 used to delimit claim 1 there from discloses a stove provided with a burning chamber in the form of a fire bucked defining a burning space and having air openings, fig 3A and rows of air openings, whereby at least one row is arranged above the other, an outer shell surrounding the burning chamber, whereby the burning chamber is detachably supported within the outer shell, supporting means holding the burning chamber in an air space at a distance from an inner wall of the outer shell, an electric fan whose air outlet is connected to the air space between the burning chamber and the inner wall, and connector means for inputting electric energy possibly from a battery, solar cells, computer or telephone. In addition it discloses that the inner wall/shell has air openings.
US 4730597 A discloses a biomass stove provided with a burning chamber in the form of a removable fuel basket with rows of air inlet openings. Of the rows of air openings in the burning chamber a higher row has air openings with a smaller diameter than a lower row. A multi burner stove is disclosed too.
US 6615821B1 discloses a portable stove having an inner wall, an outer wall and at least one middle wall nested and affixed centrally to a floor for defining multiple pathways for preheating air before it enters a combustion chamber of the stove.
US 3266478 A discloses a barbecue apparatus having a box like unit with side by side fireboxes. Each firebox has a bottom grate surrounded by perforated walls which have smaller perforations than the grate. A blower may be used for achieving a forced air draft to the boxes.
WO 2006/081595 A2 discloses a portable cooking apparatus having a suspended combustion vessel, which has a row of apertures for permitting airflow into a solid fuel combustion zone of the chamber. A secondary vessel also with apertures is interposed between the vessel and an inner shell for permitting air flow through the apparatus.
US 3791368 A discloses a multipurpose cooking assembly, which can also be used as a stove. A handle attachment structure and a removable handle cooperating therewith are described for handling a top cover of the assembly.
US 3868943 discloses a cooker stove including a electric heater assembly, which is in electrical contact with a battery, and a blower assembly. The blower may be nested in the heater in a position of the cooker. Forced air is blown through space and passages between first, second and third shells to rows of openings formed in a side wall of the stove.
It is an object of the present invention to provide a light weight multi-fuel stove suitable for heating and/or cooking and equipped to easily remove burning remnants from the stove, which stove has only a few components, is easy to manufacture, maintain and operate, and is cost-price friendly.
Thereto the stove according to the invention is characterised by the features of claim 1.
It is an advantage of the stove according to the present invention that the burning chamber is a detachable part of the stove and can be taken out of the stove and carried by any person, in order to empty the lose chamber with its ash in a safe storage place. Due to the low weight of the burning chamber emptying is easy and can be done without spilling or the forming of annoying and harmful dust ash clouds. The empty usually bucket like burning chamber can then easily be -re-filled with burnable materials, carried to the stove and inserted in the stove, ready for a new burning cycle. Advantageously this does not require any transport of the stove as a whole.
The distance of the burning chamber, with its air openings, from the inner wall of the outer shell safeguards a continuous flow of air through the air space and the air openings to the burning fuel materials in the burning chamber.
In an embodiment the stove according to the invention is characterised in that the burning chamber is provided with a flange causing the burning chamber to hang in the air space from the top end of the outer shell. The flange may be a radially outward bended flange, preferably provided at the top end of the burning chamber.
Such a stove having an easy to bend flange can be manufactured in a cost-price friendly way, in particular for use in the developing countries.
Another embodiment of the stove is characterised in that that the detachable burning chamber is provided with a connection part at its top end, and that the stove has a handle having a complementary connection part, both connection parts being equipped for being as mutually detachably engaging connection parts. In particular the connection part on the burning chamber is an extension, and the connection part of the handle is formed as a wired work, both the extension and the wired work being shaped such that the wired work can be clamped in position around the extension.
With a simple though effective outline of the connection part of the handle and its complementary connection part on the burning chamber it is easy to remove and insert the burning chamber from the stove.
With the same handle a further burning chamber possibly present inside the (main) burning chamber can be removed and inserted either individually or simultaneously upon removal or insertion of the main burning chamber.
Further advantageously the same handle can be used to move the stove as a whole.
At present the stove according to the invention will be elucidated further together with its additional advantages while reference is being made to the appended drawing, wherein similar components are being referred to by means of the same reference numerals. In the drawing:

Figs. 1a and 1b show a perspective view and an exploded view respectively of a stove according to the invention;
Figs. 2a and 2b show a side view and an upper view respectively of the stove of figs. 1a/1b;
Figs. 3a and 3b show views of possible embodiments of the main burning chamber having air openings and rows of air openings respectively for application in the stove according to fig. 1a/1b, and
Figs. 4a, 4b and 4c show how nested burning chambers can be removed individually and/or together from the air space within the inner wall of the stove.

Figs. 1a and 1b show in a perspective view and an exploded view respectively a stove 1 for heating and/or cooking, which is provided with a burning chamber 2-1, and an outer shell surrounding the burning chamber 2-1. The outer shell includes a decorative properly coloured outer wall 3-1 on the outside of the stove 1. Within the outer wall 3-1 the outer shell has an inner wall 3-2.
The outer shell may encompass double walls generally filled with a thermally isolating heat resistant material. In practise the burning chamber 2-1 and at least the inner wall 3-2 of the outer shell may be co-axially and will mostly be circular seen in horizontal cross section. For reasons of brevity this circular, co-axial embodiment will be described hereinafter. The inner wall 3-2 is hollow and defines an inner air space 4, wherefrom the inserted burning chamber 2-1 can be removed. The burning chamber 2-1 is detachably supported in the air space within the inner wall 3-2. The wall of the burning chamber 2-1 will generally be provided with air openings 5, capable of letting through air from the air space 4 to the fuel material inside of the burning chamber 2-1, in the condition wherein the chamber 2-1 is lowered in the air space 4 defined by the inner wall 3-2.
The stove 1 has supporting means here shown as an flange 6 holding the burning chamber in the air space 4 at a distance from an inner wall 3-2 of the outer shell. This flange 6 causes the burning chamber 2-1 to hang in the air space 4 from the top end of the outer shell. For reasons of improved stability the flange is an annular flange 6 provided at the top end of the burning chamber 2-1. A radially outward bended flange 6 is easy to manufacture.
The detachable burning chamber 2-1 shown in figs. 2a, 2b, 3a and 3c is provided with a connection part 7-1 at its top end, and the stove 1 has a handle 8 having a complementary connection part 7-2. Both connection parts 7-1 and 7-2 are equipped as mutually detachably engaging connection parts. These parts will here be hooked onto each other as a simple means to remove the burning chamber 2-1 from the air space 4, which eases emptying the burning remains outside the house without transporting the stove 1 as a whole, or to place it back therein possibly holding new materials to be burned.
It is particularly convenient if the connection part 7-1 on the burning chamber 2-1 is an extension, and the connection part 7-2 of the handle 8 is formed as a wired work, both as shown in the above mentioned figures. Preferably the extension and the wired work being shaped such that the wired work can be clamped or tuned in position on or around the extension.
The same handle 8 used for moving the chamber 2-1 in and out of the stove 1 can be used to transport the stove as a whole if the outer wall 3-1 of the outer shell has an outer wall with a similar connection part 7-1 as the burning chamber 2-1 for being engaged by the complementary connection part 7-2 of that same handle 8.
It may be practical to provide a small fire if the burning chamber 2-1 which defines an inner burning space, is provided with a further burning chamber 2-2, which can be inserted in said inner burning space. The chamber 2-2 may also have suitable air openings. Preferably the nestable further burning chamber 2-2 is provided with a connection part 7-1 at its top end, similar to the part 7-1 on the top end flange 6 of the chamber 2-1 for being engaged by the same complementary connection part 7-2 of the handle 8.
In particular figs. 2a and 2b show that the upper flanges at the top ends of the burning chambers 2-1 and 2-2 lie in an upper plane of the stove 1. For constructional ease the stove 1 is provided with possibly removable braces 9 for clamping an upper flanges supporting ring 10.
Figs. 3a and 3b each show main burning chambers 2-1 having air openings 5 and rows of air openings -upper openings in fig. 3b- respectively for application in the stove 1.
The particularly outlined rows with smaller openings on top of and in between larger lower openings appeared to be advantageous in terms of achieving a stable burning yielding quietly burning flames.
The additional drawings of figs. 4a, 4b and 4c show the way wherein only the outer burning chamber 2-1, or only chamber 2-2 or both chambers 2-1 and 2-2 simultaneously can be hooked onto the one handle 8 by means of the oval shaped connection part 7-2 in combination with the connected holding clip-like parts 7-1 on top of the chambers 2-1 and 2-2.
As schematically also shown in fig. 1b the stove 1 is provided with an electric fan 11 whose air outlet is connected to the air space 4. In that case the stove 1 is also provided with connector means 12 for inputting electric energy such as from a battery, solar cells, computer or telephone, either or not provided with solar cells.
The upper part of the stove 1 may be provided with either or not removable cooking pan supports, which may be the braces 9, whereon a backing or cooking pan can be placed. The stove 1 may also hold a suitable grill plate.
As shown the stove 1 is provided legs 13, which may be telescopically extendable in order to conveniently lift the stove 1.

Claims

A stove (1) provided with:
- a burning chamber (2-1) defining a burning space and having air openings (5) and rows of air openings, whereby at least one row is arranged above the other,

- an outer shell surrounding the burning chamber (2-1), whereby the burning chamber (2-1) is detachably supported within the outer shell,

- supporting means (6) holding the burning chamber (2-1) in an air space (4) at a distance from an inner wall (3-2) of the outer shell,

- an electric fan (11) whose air outlet is connected to the air space (4) between the burning chamber (2-1) and the inner wall (3-2), and connector means (12) for inputting electric energy possibly from a battery, solar cells, computer or telephone,
characterised in that:
- of the rows of air openings (5) in the burning chamber (2-1) a higher row has air openings with a smaller diameter than a lower row, and that

- the stove (1) is provided with a further burning chamber (2-2) having rows of air openings (5), which further burning chamber (2-2) can be inserted in the burning space of the burning chamber (2-1), such as to form nested burning chambers (2-1, 2-2) which can be removed individually and/or together from the air space within the inner wall (3-2) of the stove (1).
Stove (1) according to claim 1, characterised in that the burning chamber (2-1; 2-2) is provided with a flange (6) causing the burning chamber (2-1) to hang in the air space (4) from the top end of the outer shell.
Stove (1) according to claim 2, characterised in that the flange (6) is a radially outward bended flange, preferably provided at the top end of the burning chamber (2-1; 2-2).
Stove (1) according to any one of the claims 1-3, characterised in that the detachable burning chamber (2-1; 2-2) is provided with a connection part (7-1; 7-1) at its top end, and that the stove (1) has a handle (8) having a complementary connection part (7-2), both connection parts (7-1, 7-2) being equipped for being as mutually detachably engaging connection parts.
Stove (1) according claim 4, characterised in that the connection part (7-1; 7-1) on the burning chamber (2-1; 2-2) is an extension, and that the connection part (7-2) of the handle (8) is formed as a wired work, both the extension and the wired work being shaped such that the wired work can be clamped in position around the extension.
Stove (1) according to any one of the claims 4 or 5, characterised in that the outer shell has an outer wall (3-1) having a connection part (7-1) for being engaged by the complementary connection part (7-2) of the handle (8).
Stove (1) according to any one of the claims 4-6, characterised in that the further burning chamber (2-2) is provided with a connection part (7-1) at its top end for being engaged by the complementary connection part (7-2) of the handle (8).
Stove (1) according to any one of the claims 1-7, characterised in that the outer shell encompasses double walls (3-1, 3-2) filled with a thermally isolating heat resistant material.
Stove (1) according to any one of the claims 1-8, characterised in that the upper flanges (6) at the top ends of the burning chambers (2-1, 2-2) lie in an upper plane of the stove, and that the stove (1) is provided with possibly removable braces (9) for clamping an upper flanges supporting ring (10).
Stove (1) according to claim 9, characterised in that the upper part of the stove (1) is provided with a possibly removable support, such as for a cooking pan or a grill plate.
Stove (1) according to any one of the claims 4-10, characterised in that only the outer burning chamber (2-1), or only the further burning chamber (2-2) or both chambers (2-1, 2-2) simultaneously can be hooked onto the one handle (8) by means of the oval shaped connection part (7-2) in combination with the connection parts (7-1) which are in the form of holding clip-like parts on top of the chambers (2-1, 2-2).
Stove (1) according to any one of the claims 1-11, characterised in that the burning chamber/chambers (2-1, 2-2) and the outer shell are co-axially, in particular circularly relative to one another.