GB2530732A

GB2530732A - Solid fuel stove

Info

Publication number: GB2530732A
Application number: GB1417200.1A
Authority: GB
Inventors: Andrew Price; Ian Hughes; Alex Watson; Kevin Simpson; Walter Bloodworth
Original assignee: Be Modern Ltd
Current assignee: Be Modern Ltd
Priority date: 2014-09-30
Filing date: 2014-09-30
Publication date: 2016-04-06
Also published as: GB201417200D0

Abstract

Disclosed is a solid fuel stove 1 comprising a firebox 14 having a grate 16 disposed therein for supporting solid fuel and a secondary air supply arrangement. The secondary air supply arrangement comprises at least one secondary air outlet 42 disposed above the grate 16 in an upper frontal region of the firebox 14 for supplying secondary air to the firebox 14. First and second 116 secondary air ducts are also supplied, each in fluid communication with at least one secondary air outlet 42 for conveying secondary air from a lower region to an upper region of the stove 1. The first and second secondary air ducts each have an upwardly extending duct section, each of which is laterally spaced and separated from one another along their lengths.

Description

SOLID FUEL STOVE

The invention relates to a solid fuel stove, in particular a solid fuel stove having a secondary air supply arrangement comprising first and second secondary air supply ducts. The invention also relates to a method of making such a stove.

Solid fuel stoves, such as wood burners or multi-fuel stoves, are well known. They typically comprise a stove body defining a firebox having a grate which supports the solid fuel which is combusted within the firebox. It is necessary to control the supply of air to the firebox in order to ensure efficient combustion of the fuel. There are typically three types of air which can be supplied to the firebox. Primary air -this is supplied from below the grate and is drawn up through the combusting fuel. Secondary air -this is supplied to the combusting fuel from towards the top of the firebox and is directed downwards towards the fuel. The secondary air may be pre-heated. Tertiary air -this is supplied directly towards the fuel from above the grate and from the rear of the firebox. Stoves my only have one or two of these types of air supply. For example, there may be a secondary air flow but no primary or tertiary airflow.

It is necessary to provide outlets for supplying the air into the firebox and ducts for conveying the air to the outlets. Typically, the stove body is formed as a metal box, and various metal plates may be welded to it to form the appropriate ducts. The secondary air duct, for example, is usually formed by welding a steel plate across the rear of the metal box structure to form a single wide transversely extending duct.

Such stoves may be relatively expensive and/or complex to manufacture and may result in a relatively large stove when compared to the actual size of the firebox.

It is therefore desirable to provide an improved solid fuel stove that may be less expensive to manufacture and which may be more compact.

According to an aspect there is provided a solid fuel stove, comprising: a firebox having a grate disposed therein for supporting solid fuel; a secondary air supply arrangement comprising: at least one secondary air outlet disposed above the grate in an upper frontal region of the firebox for supplying secondary air to the firebox; and first and second secondary air ducts each in fluid communication with at least one secondary air outlet and for conveying secondary air from a lower region to an upper region of the stove, the first secondary air duct having a first upwardly extending duct section and the second secondary air duct having a second upwardly extending duct section, each upwardly extending duct section upwardly extending from a lower region to an upper region of the stove; wherein the first and second upwardly extending duct sections are laterally spaced and separated from one another along their lengths. Providing two separate secondary air ducts allows them to be laterally spaced from one another.

This may allow the volume of the firebox to be increased, whilst minimizing the outer dimensions of the stove. Further, the structure of the stove may be easier and/or less expensive to manufacture from materials such as steel plate. The stove may have a substantially rectangular cross section in a horizontal plane. The stove may be substantially a rectangular cuboid.

The stove may also comprise a primary air supply arrangement having at least one primary air outlet disposed below the grate for supply primary air to the firebox.

It should be appreciated that usage of terms such as "upwards", "downwards", "forwards", "below", "lateral", "rear" and "frontal" are used with reference to the orientation of the stove in normal use.

The first and second upwardly extending duct sections may be located in rear adjacent corners of the stove. The first and second upwardly extending duct sections may be located in opposing sides of the stove. The first and second upwardly extending duct sections may each have a substantially triangular cross section. The first and second upwardly extending duct sections may be substantially parallel to one another.

The first secondary air duct may further comprise a first forwardly extending duct section and the second secondary air duct may further comprise a second forwardly extending duct section. Each forwardly extending duct section may be located in an upper region of the stove, may be in fluid communication with the upper end of a respective upwardly extending duct section, and may forwardly extend from a rear region to a frontal region of the stove. The first and second forwardly extending duct sections may be laterally spaced and separated from one another along their lengths.

The first and second forwardly extending duct sections may each have a substantially rectangular cross section. The first and second forwardly extending duct sections may be substantially parallel to one another.

The first and second secondary air ducts may be located in opposing side regions of the stove. The first and second secondary air ducts may be substantially mirror images of one another. The first and second secondary air ducts may lie in parallel and laterally spaced vertical planes which are perpendicular to the front face of the stove.

In use, secondary air may be pre-heated as it is conveyed within the first and second secondary air ducts.

The secondary air supply arrangement may comprise a transversely extending elongate secondary air chamber located in an upper frontal region of the stove. The secondary air ducts may open into the secondary air chamber. The or each secondary air outlet may open from the secondary air chamber. There may be a single secondary air outlet. The first and second secondary air ducts may be arranged to supply secondary air to the single secondary air outlet. The or each secondary air outlet may be in the form of a horizontally extending slit. The or each secondary air outlet may be arranged such that in use the or each secondary air outlet directs secondary air downwards across a frontal region of the firebox. The solid fuel stove may further comprise a baffle plate disposed within the firebox and upwardly angled from a rear region to a frontal region of the firebox. The or each secondary air outlet may be disposed forward from a forward edge of the baffle plate. The or each secondary air outlet may be arranged to direct secondary air into the firebox from above the baffle plate. The solid fuel stove may further comprise an exhaust chamber having an exhaust chamber inlet and a flue outlet for discharging exhaust gases, each opening into the exhaust chamber. The exhaust chamber inlet may be in the form of an elongate slit. The exhaust chamber inlet may be below the or each secondary air outlet. The exhaust chamber inlet may be above the baffle plate and adjacent to a forward edge of the baffle plate.

The solid fuel stove may further comprise an air inlet chamber separated from and disposed below the firebox. The air inlet chamber may have at least one air inlet. The first and second secondary air ducts may be in fluid communication with the air inlet chamber.

The primary air supply arrangement may comprise at least one primary air duct for conveying primary air from a lower region of the stove to at least one primary air outlet.

The primary air duct may be located at the rear of the stove. The solid fuel stove may further comprising a stove body structure having an outer rear panel at least partly defining the outer rear side of the stove and a cover member attached to the outer rear panel, wherein the primary air duct is at least partly defined between the outer rear panel and the cover member.

There may be an air inlet chamber divider disposed within the air inlet chamber and separating the air inlet chamber into a primary air inlet chamber and a secondary air inlet chamber. The primary air inlet chamber and the secondary air inlet chamber may each have at least one air inlet. The at least one primary air duct may be in fluid communication with the primary air inlet chamber and the first and second secondary air ducts may be in fluid communication with the secondary air inlet chamber.

The solid fuel stove may further comprise a tertiary air supply arrangement having at least one tertiary air outlet disposed above the grate in a rear region of the firebox for supplying tertiary air to the firebox. The tertiary air supply arrangement may comprise at least one tertiary air duct for conveying tertiary air from a lower region of the stove to at least one tertiary air outlet. The tertiary air duct may be located at the rear of the stove. The tertiary air duct may be at least partly defined between the outer rear panel and the cover member. A duct divider may separate the primary and tertiary air ducts.

The air inlet chamber may provide a combined secondary-tertiary air inlet chamber.

The first and second secondary air ducts and the tertiary air duct may be in fluid communication with the secondary-tertiary air inlet chamber.

The solid fuel stove may further comprise an airflow control mechanism for controlling the primary and/or secondary and/or tertiary airflow into the firebox. The airflow control mechanism may allow the primary and/or secondary and/or tertiary airflow to be separately controlled. The airflow control mechanism may comprise a primary controller for controlling the primary airflow and a secondary-tertiary controller for controlling the secondary and tertiary airflow. The primary and/or secondary controller may comprise one or more control levers coupled to one or more throttle plates. In use, the airflow may be regulated by moving a control lever to move the throttle plate.

The solid fuel stove may further comprise an inner stove body structure at least partly defining the rear side and the opposing lateral sides of the firebox; an outer stove body structure located around and attached to at least a part of the inner stove body structure and having opposing outer lateral side panels at least partly defining the opposing outer lateral sides of the stove and having a front frame defining an opening for providing access to the interior of the firebox; wherein the first and second secondary air ducts are at least partly defined between the inner and outer stove body structures. The inner stove structure may comprise opposing inner lateral side panels.

The inner stove structure may comprise an outer rear panel at least partly defining the outer rear side of the stove. The inner stove structure may be integrally formed or may comprise a plurality of panels connected together, such as by welding. Similarly the outer stove structure may be integrally formed or may comprise a plurality of panels connected together, such as by welding. The stove body may further comprise a top panel and/or a bottom panel. The inner and outer stove body structures may be welded to one another. The inner and outer stove body structures may be at least partly formed from steel plate. The solid fuel stove may further comprise a fire door coupled to the front frame of the outer stove body structure such that it can be moved between at least an open position in which the opening is exposed and a closed position in which the opening is covered. One or more insulating liners may be provided or disposed within the firebox.

According to another aspect there is provided a solid fuel stove, comprising: a firebox having a grate disposed therein for supporting solid fuel; a stove body comprising: an inner stove body structure at least partly defining the rear side and the opposing lateral sides of the firebox; an outer stove body structure located around and attached to at least a part of the inner stove body structure and having opposing outer lateral side panels at least partly defining the opposing outer lateral sides of the stove and having a front frame defining an opening for providing access to the interior of the firebox; and a secondary air supply arrangement having at least one secondary air outlet disposed above the grate in an upper frontal region of the firebox for supplying secondary air to the firebox, and at least one secondary air duct in fluid communication with at least one secondary air outlet and for conveying secondary air from a lower region to an upper region of the stove; wherein the at least one secondary air duct is at least partly defined between the inner and outer stove body structures.

The stove may also comprise a primary air supply arrangement having at least one primary air outlet disposed below the grate for supply primary air to the flrebox.

The inner and outer stove body structures may be welded to one another. The inner and outer stove body structures may be at least partly formed from steel plate. The solid fuel stove may further comprise a fire door coupled to the front frame of the outer stove body structure such that it can be moved between at least an open position in which the opening is exposed and a closed position in which the opening is covered.

According to yet another aspect there is provided a method of manufacturing a solid fuel stove in accordance with any statement herein, the method comprising: forming an inner stove body structure at least partly defining the rear side and the opposing sides of the firebox; forming an outer stove body structure having opposing outer lateral side panels at least partly defining the opposing outer lateral sides of the stove and having a front frame defining an opening for providing access to the interior of the firebox; locating the outer stove body structure around the inner stove body structure to at least partly define at least one secondary air duct between the inner and outer stove body structures; and attaching the inner and outer stove body structures together. It should be appreciated that the method steps may be performed in any order and the order in which they are described is not limiting, except where one step cannot be performed before another has been carried out.

Forming the inner stove body structure may comprise bending and/or welding steel plate. Forming the outer stove body structure may comprise bending and/or welding steel plate. Attaching the inner and outer stove body structures together may comprise welding them together.

The invention may comprise any combination of the features and/or limitations referred to herein, except combinations of such features as are mutually exclusive.

Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 schematically shows a perspective view of a solid fuel stove; Figure 2 schematically shows the stove of Figure 1 with the door open; Figure 3 schematically shows a cross-sectional view of the stove of Figure 1 along the line A-A; Figure 4 schematically shows a front view of the stove of Figure 1; Figure 5 schematically shows an exploded view of the stove body of the stove of Figure 1; Figure 6 schematically shows a perspective view of the inner stove body structure of Figure 5; Figures 7 and 8 schematically show sectioned views of the stove of Figure 1; and Figure 9 schematically shows a cross sectional view of the stove of Figure 1 along the line B-B.

Figures 1 and 2 show a solid fuel stove 1 such as a wood burning stove or a multi-fuel stove. The stove 1 is substantially a rectangular cuboidal and comprises a stove body which defines a combustion chamber, known as a firebox 14, and a grate 16 which is disposed and supported within the firebox 14. An opening 18 (Figure 2) is provided in the stove body 10 which provides access to the firebox 14. The stove 1 further comprises a door assembly 12 hingedly mounted to the front of the stove body 1 over the opening 18. The door assembly 12 comprises a door 20 having a door frame 22 and a glass panel 24, and a handle 26 connected to a latch member 28 by a rotatable shaft (not visible). The door 20 can be moved between a closed position (Figure 1) in which it covers the opening 18 and an open position (Figure 2) in which the opening 18 is exposed to provide access to the firebox 14. The handle 26 can be operated to engage the latch member 28 with the stove body 10 so as to keep the door 20 closed.

In order to operate the stove, the door 20 is opened and fuel is loaded into the firebox 14 and supported on the grate 16. The door 20 is then closed and the fuel is combusted within the firebox 14. Exhaust gases exit the firebox 14 through one of two flue outlets 30 provided in the stove body 10 (the flue outlet 30 not being used is sealed). A number of air supply arrangements are provided which can be used to supply air to the firebox 14. The air supplied by these arrangements can be controlled so as to control the combustion of the fuel. In this particular embodiment the stove 1 is provided with a primary air supply arrangement, a secondary air supply arrangement and a tertiary air supply arrangement. These air supply arrangements will be described in detail below. It should be appreciated that in other embodiments there may only be one or two types of air supply arrangement. For example, there may be a primary and a secondary air supply arrangement, but no tertiary air supply arrangement. In yet a further embodiment there may be only a secondary air supply arrangement.

Referring to Figures 3 and 4, a baffle plate 32 is located within the firebox 14 and transversely extends across the entire width of the firebox 14. The baffle plate 32 is angled upwards and extends from the rear of the firebox 14 towards a frontal region of the firebox 14. An exhaust chamber 34 is defined above the baffle plate 32 and the two flue outlets 30 (only one of which is used) open from this exhaust chamber 34. An exhaust chamber inlet 36 in the form of an elongate silt or slot extending across the width of the firebox 14 is located above the forward edge 38 of the baffle plate 32, and in use, exhaust gases E generated within the firebox 14 flow around the forward edge 38 of the baffle plate 32, into the exhaust chamber 36, and out through one of the flue outlets 30.

The primary air supply arrangement comprises a plurality of primary air outlets 40, or nozzles. The primary air outlets 40 are in the form of small holes arranged side-by-side in a transversely extending line. The primary air outlets 40 are provided in a rear wall of the firebox 14 and are disposed below the grate 16. The primary air outlets 40 are arranged to direct primary air P into the firebox 14 from below the grate 16. The secondary air supply arrangement comprises a single secondary air outlet 42 in the form of a transversely extending elongate slit or slot. The secondary air outlet 42 is located above the grate 16 in an upper frontal region of the firebox 14. More particularly, and as shown in Figure 3, the secondary air outlet 42 is located in front of the forward edge 38 of the baffle plate 32 and is at approximately the same height as the edge 32. The secondary air outlet 42 is arranged to direct secondary air S into the firebox 14 from above the grate 14 and is arranged to direct secondary airS downwards across the frontal region of the firebox 14 and across the inner surface of the door 12 (specifically the glass panel 24). The tertiary air supply arrangement comprises a plurality of tertiary air outlets 44, or nozzles. The tertiary air outlets 44 are in the form of small holes arranged side-by-side in a transversely extending line. The tertiary air outlets 44 are provided in a rear wall of the firebox 14 and are disposed above the grate 16. The tertiary air outlets 44 are arranged to direct tertiary air T into the firebox 14 from above the grate 16.

The stove body 10 is constructed so as to form ducts that supply primary, secondary and tertiary air to the primary, secondary, and tertiary air outlets. With reference to Figure 5, the stove body 10 comprises an outer stove body structure 46, an inner stove body structure 48, and a cover member 50, and a top panel 52. The stove body 10 is substantially symmetrical about a vertical plane perpendicular to the front face of the stove 1.

The outer stove body structure 46 comprises left and right lateral side panels 54, 56 that define the outer lateral sides of the stove 1 and a front frame 58 that defines the opening 18 to the firebox 14. The lateral side panels 54, 56 are parallel to one another and perpendicular to the front frame 58. The outer stove body structure 46 also comprises left and right rear flanges 60, 62 that extend at right angles from the left and right lateral side panels 54, 56 respectively and which are parallel to the front frame 58.

In this embodiment the outer stove body structure 46 is integrally formed from cutting and bending steel plate. However, in other embodiments it could be constructed by attaching discrete panels together.

Referring also to Figure 6, the inner stove body structure 48 comprises a number of sections formed from steel plate welded together to define the rear side and the opposing lateral sides of the firebox 14. There is a main section 64 that defines a rear panel section 66, a bottom panel section 68 and left and right angled corner panel sections 70, 72. The rear panel section 66 lies in a vertical plane and is parallel to the front and rear faces of the stove 1 and the bottom panel section 68 lies in a horizontal plane. The angled corner panel sections 70, 72 extend from opposing lateral sides of the rear panel section 66 and line in vertical planes that are angled with respect to the rear panel section 66. The internal angle between the left panel section 70 and the rear panel section 66 is 135°, similarly, the internal angle between the right panel section 72 and the rear panel section 66 is 135°. Attached to the inner side of the rear panel section 66 is an inner back panel 74. Further, left and right sections 76, 78 are attached to the left and right angled corner panel sections 70, 72 respectively. Each of the left and right sections 76, 78 comprises an inner side panel section 80, 82 that lies in a vertical plane and is perpendicular to the front face of the stove 1 and an inner corner panel section 84, 86 that is parallel to and attached to the respective angled corner panel section 70, 72 of the main section 64. The baffle plate 32 is attached to the inner back panel 74 and the left and right sections 76, 78. A base panel 88, which lies in a horizontal plane and is spaced above the bottom panel section 68 is attached to the main section 64, the inner back panel 74 and the left and right sections 76, 78.

The firebox 14 is defined by the base panel 88, the baffle plate 32, the left and right sections 76, 78 and the inner back panel 74. The primary air outlets 40 and the tertiary outlets 44 extend through the rear panel section 66 and the inner back panel 74 into the firebox 14.

The inner stove body structure 48 further comprises an upper U-shaped panel 90 that is mainly located in a horizontal plane, but which comprises a downwardly turned transversely extending lip 92. The upper U-shaped panel 90 is located above the baffle 32 such that the forward edge of the lip 92 is parallel to and forward from the forward edge 38 of the baffle. The U-shaped panel 90 is attached to the rear panel section 66, and the upper edges of the left and right angled corner panel sections 70, 72 of the main section 64. A U-shaped vertical wall section 94 is also provided and is attached to the inner edge of the U-shaped panel 60 and the rear panel section 66 of the main section 64. The top panel 52 of the stove body 10 is attached to the upper edge of the U-shaped veitical wall section 94 and to the upper edge of the rear panel section 66. A first divider 96 is attached to the outer side of the rear panel section 66 of the main section 64 and extends perpendicularly from it. This divider 96 separates the primary air outlets 40 from the tertiary air outlets 44. A second divider 98 is attached between the bottom panel section 68 and the base panel 88, the function of this will be described below.

The cover member 50 is formed from a steel plate and has a central panel 100 with a turned edge 102 that extends around three sides (top, right, left) of the central panel 100.

To assemble the stove body 10, the outer stove body structure 46 is located around the inner stove body structure 48 and the two are attached together by welding.

Specifically, the left and right rear flanges 60, 62 are attached to the rear panel section 66 and the bottom panel section 68 and it is also attached to the top panel 52. Further, the cover member 50 is attached to the inner stove body structure 48 by welding it to the rear panel section 66 and to the bottom panel section 68 such that it is located over the primary and tertiary air outlets 40, 44. The door assembly 12 is then attached to the front frame 58 of the outer stove body structure 46 using hinges. Although not shown, the walls of the firebox 14 may be lined with insulating/fire bricks.

As shown in Figures 7, 8 and 9, the construction of the stove body 10 forms a number of air chambers and air ducts that form part of the primary, secondary and tertiary air supply arrangements. An air inlet chamber 104 is formed between the bottom panel section 68 and the base panel 88. The divider 98 separates the air inlet chamber into a primary air inlet chamber 106 and a combined secondary-tertiary air inlet chamber 108.

The primary air inlet chamber 106 is provided with primary air inlets 107 (Figure 3) through which ambient air can be drawn into the primary air inlet chamber 106.

Similarly, the secondary-tertiary air inlet chamber 108 is provided with secondary-tertiary air inlets 109 (Figure 3) through which ambient air can be drawn into the secondary-tertiary air inlet chamber 108.

The divider 96 disposed between the rear panel section 66 and the cover member 50 forms two separate air ducts, specifically, a primary air duct 110 and a tertiary air duct 112. The primary air duct 110 is connected to the primary air inlet chamber 106 and is arranged to supply primary air to the primary air inlets 40 such that primary air can be supplied to the firebox 14. The tertiary air duct 112 is connected to the secondary-tertiary air inlet chamber 108 and is arranged to supply tertiary air to the tertiary air inlets 44 such that tertiary air can be supplied to the firebox 14.

First and second secondary air duds 114, 116 are formed between the inner stove body structure 48 and the outer stove body structure 46. The first and second secondary air ducts 114, 116 are disposed on opposing lateral sides of the stove 1 and are substantially mirror images of one another. The first and second secondary air ducts 114, 116 lie in substantially horizontal parallel planes that are perpendicular to the front face of the stove 1. The first and second secondary air ducts 114, 116 are in communication with the secondary-tertiary air inlet chamber 108 and are arranged to convey secondary air from the chamber 108 which is in a lower region of the stove, upwards, and forwards to the secondary air outlet 42 such that secondary air can be supplied to the firebox 14.

Each secondary air duct 114, 116 comprises an upwardly extending duct section 118, and a forwardly extending duct section 122, 124. As best shown in Figure 9, the upwardly extending duct sections 118, 120 are located in adjacent rear corners of the stove 1, have a substantially triangular cross section, and extend vertically upwards.

The upwardly extending duct sections 118, 120 are defined between the corner panel sections 70, 72 and the outer stove body structure 46. The upwardly extending duct sections 118, 120 are laterally spaced from and separated from one another along their lengths. The lower ends of the upwardly extending duct sections 118, 120 are connected to the secondary-tertiary air inlet chamber 108. The forwardly extending duct sections 122, 124 are located in an upper region of the stove 1 and extend horizontally forwards from a rear region of the stove 1 where they are connected to the upper end of the respective upwardly extending dud section 118, 120, to a frontal region of the stove 1. The forwardly extending duct sections 122, 124 have a substantially rectangular cross section and are defined between the U-shaped panel 90, the U-shaped wall 92, the top panel 52 and the outer stove body structure 46. The forwardly extending duct sections 122, 124 are laterally spaced from and separated from one another along their lengths.

A transversely extending elongate secondary air channel 126 is also formed between the U-shaped panel 90, the U-shaped wall 92 and the top panel 52. The secondary air channel is 126 located in an upper frontal region of the stove 1 and the forwardly extending duct sections 122, 124 open into it. The secondary air outlet 42 opens from the secondary air channel 126 such that secondary air conveyed from the secondary-tertiary air inlet chamber 108 by the secondary air ducts 114, ll6can be supplied into the firebox 14 from the secondary air inlet 42.

The exhaust chamber 34 is defined between the baffle plate 32, the top plate 52, the U-shaped panel 90, the U-shaped wall 92 and the outer stove body structure 46. The flue outlets 30 open into the exhaust chamber 34.

Although not shown in detail, an airflow control mechanism is provided comprising a primary airflow lever 128 and a secondary-tertiary airflow lever 130. The primary airflow lever 128 is connected a primary throttle plate which is positioned over the primary air inlets 107 to the primary air inlet chamber 106, and the secondary-tertiary airflow lever 130 is connected to a secondary-tertiary airflow throttle plate which is positioned over the secondary-tertiary inlets 109 to the secondary-tertiary air inlet chamber 108. In use, the position of the levers 128, 130 can be adjusted to control the amount of ambient air which can be drawn into the respective air inlet chambers 106, 108. This in turn controls the amount of primary, secondary and tertiary air supplied to the firebox 14 which affects the combustion of the fuel within the stove.

In use, air drawn into the primary air inlet chamber 106 through the primary air inlets flows through the primary air duct 110 and is supplied into the firebox 14 under the grate 16 through the primary air outlets 40. Air drawn into the secondary-tertiary air inlet chamber 108 through the secondary-tertiary air inlets is preheated within the air inlet chamber 108. The majority of the air enters the first and second secondary air ducts 114, 116 where it is conveyed vertically upwards from a lower region of the stove to an upper region of stove within the upwardly extending duct sections 118, 120. As the secondary air is conveyed within these duct sections 118, 120 it is preheated. The secondary air is then conveyed forwards from an upper rear region of the stove to an upper frontal region of the stove within the forwardly extending duct sections 122, 124.

The pie-heated secondary air then enters the secondary air channel 126 from where it is supplied into the firebox 14 through the secondary air outlet 42. The pie-heated secondary air is supplied downwards across a frontal region of the firebox 14 past the inner surface of the door 20. Some of the air within the secondary-tertiary air inlet chamber 108 enters the tertiary air duct 112 and is supplied into the firebox 14 above the grate 16 through the tertiary air outlets 44.

Solid fuel stoves as described above may be inexpensive to manufacture when compared to the prior art. Further, it may be possible to manufacture more compact stoves having a larger firebox volume for the same external dimensions. This may result from separate first and second secondary air ducts located on opposing sides of the stove. It should be appreciated that in other embodiments, there may be a single secondary air duct defined or formed between an inner stove body structure and an outer stove body structure. Although it has been described that there is a single secondary air outlet, in other embodiments multiple secondary air outlets could be provided.

Claims

CLAIMS: 1. A solid fuel stove, comprising: a firebox having a grate disposed therein for supporting solid fuel; and a secondary air supply arrangement comprising: at least one secondary air outlet disposed above the grate in an upper frontal region of the firebox for supplying secondary air to the firebox; and first and second secondary air ducts each in fluid communication with at least one secondary air outlet and for conveying secondary air from a lower region to an upper region of the stove, the first secondary air duct having a first upwardly extending duct section and the second secondary air duct having a second upwardly extending duct section, each upwardly extending duct section upwardly extending from a lower region to an upper region of the stove; wherein the first and second upwardly extending duct sections are laterally spaced and separated from one another along their lengths.
2. A solid fuel stove according to claim 1, wherein the first and second upwardly extending duct sections are located in rear adjacent corners of the stove.
3. A solid fuel stove according to claim 2, wherein the first and second upwardly extending duct sections each have a substantially triangular cross section.
4. A solid fuel stove according to any preceding claim, wherein the first and second upwardly extending duct sections are substantially parallel to one another.
5. A solid fuel stove according to any preceding claim, wherein the first secondary air duct further comprises a first forwardly extending duct section and wherein the second secondary air duct further comprises a second forwardly extending duct section, each forwardly extending duct section located in an upper region of the stove, in fluid communication with the upper end of a respective upwardly extending duct section, and forwardly extending from a rear region to a frontal region of the stove.
6. A solid fuel stove according to claim 5, wherein the first and second forwardly extending duct sections are laterally spaced and separated from one another along their lengths.
7. A solid fuel stove according to claim 5 or 6, wherein the first and second forwardly extending duct sections each have a substantially rectangular cross section.
8. A solid fuel stove according to any of claims 5-7, wherein the first and second forwardly extending duct sections are substantially parallel to one another.
9. A solid fuel stove according to any preceding claim, wherein the first and second secondary air ducts are located in opposing side regions of the stove.
10. A solid fuel stove according to any preceding claim, wherein the first and second secondary air ducts are substantially mirror images of one another.
11. A solid fuel stove according to any preceding claim, wherein in use, secondary air is pre-heated as it is conveyed within the first and second secondary air ducts.
12. A solid fuel stove according to any preceding claim, wherein there is a single secondary air outlet, wherein the first and second secondary air ducts are arranged to supply secondary air to the single secondary air outlet.
13. A solid fuel stove according to any preceding claim, wherein the or each secondary air outlet is in the form of a horizontally extending slit.
14. A solid fuel stove according to any preceding claim, wherein the or each secondary air outlet is arranged such that in use the or each secondary air outlet directs secondary air downwards across a frontal region of the firebox.
15. A solid fuel stove according to any preceding claim, further comprising a baffle plate disposed within the firebox and upwardly angled from a rear region to a frontal region of the firebox, wherein the or each secondary air outlet is forward from a forward edge of the baffle plate.
16. A solid fuel stove according to any preceding claim, further comprising an air inlet chamber separated from and disposed below the firebox, the air inlet chamber having at least one air inlet, wherein the first and second secondary air ducts are in fluid communication with the air inlet chamber.
17. A solid fuel stove according to any preceding claim, further comprising a primary air supply arrangement having at least one primary air outlet disposed below the grate for supply primary air to the firebox;
18. A solid fuel stove according to claim 17, wherein the primary air supply arrangement comprises at least one primary air duct for conveying primary air from a lower region of the stove to at least one primary air outlet.
19. A solid fuel stove according to claim 17 or 18, further comprising a stove body structure having an outer rear panel at least partly defining the outer rear side of the stove and a cover member attached to the outer rear panel, wherein the primary air duct is at least partly defined between the outer rear panel and the cover member.
20. A solid fuel stove according to claim 18 or 19 when appended to claim 16, further comprising an air inlet chamber divider disposed within the air inlet chamber and separating the air inlet chamber into a primary air inlet chamber and a secondary air inlet chamber, the primary air inlet chamber and the secondary air inlet chamber each having at least one air inlet, wherein the at least one primary air duct is in fluid communication with the primary air inlet chamber and wherein the first and second secondary air ducts are in fluid communication with the secondary air inlet chamber.
21. A solid fuel stove according to any preceding claim, further comprising a tertiary air supply arrangement having at least one tertiary air outlet disposed above the grate in a rear region of the firebox for supplying tertiary air to the firebox.
22. A solid fuel stove according to claim 21, wherein the tertiary air supply arrangement comprises at least one tertiary air duct for conveying tertiary air from a lower region of the stove to at least one tertiary air outlet.
23. A solid fuel stove according to claim 22 when appended to claim 19, wherein the tertiary air duct is at least partly defined between the outer rear panel and the cover member, a duct divider separating the primary and tertiary air ducts.
24. A solid fuel stove according to claim 22 or 23 when appended to claim 16, wherein the air inlet chamber provides a combined secondary-tertiary air inlet chamber, wherein the first and second secondary air ducts and the tertiary air duct are in fluid communication with the secondary-tertiary air inlet chamber.
25. A solid fuel stove according to any preceding claim, further comprising a stove body comprising: an inner stove body structure at least partly defining the rear side and the opposing lateral sides of the firebox; an outer stove body structure located around and attached to at least a part of the inner stove body structure and having opposing outer lateral side panels at least partly defining the opposing outer lateral sides of the stove and having a front frame defining an opening for providing access to the interior of the firebox; wherein the first and second secondary air ducts are at least partly defined between the inner and outer stove body structures.
26. A solid fuel stove according to claim 25, wherein the inner and outer stove body structures are welded to one another.
27. A solid fuel stove according to claim 25 or 26, wherein the inner and outer stove body structures are at least partly formed from steel plate.
28. A solid fuel stove according to claim 26 or 27, further comprising a fire door coupled to the front frame of the outer stove body structure such that it can be moved between at least an open position in which the opening is exposed and a closed position in which the opening is covered.
29. A solid fuel stove, comprising: a firebox having a grate disposed therein for supporting solid fuel; a stove body comprising: an inner stove body structure at least partly defining the rear side and the opposing lateral sides of the firebox; an outer stove body structure located around and attached to at least a part of the inner stove body structure and having opposing outer lateral side panels at least partly defining the opposing outer lateral sides of the stove and having a front frame defining an opening for providing access to the interior of the firebox; and a secondary air supply arrangement having at least one secondary air outlet disposed above the grate in an upper frontal region of the firebox for supplying secondary air to the firebox, and at least one secondary air duct in fluid communication with at least one secondary air outlet and for conveying secondary air from a lower region to an upper region of the stove; wherein the at least one secondary air duct is at least partly defined between the inner and outer stove body structures.
30. A solid fuel stove according to claim 29, wherein the inner and outer stove body structures are welded to one another.
31. A solid fuel stove according to claim 29 or 30, wherein the inner and outer stove body structures are at least partly formed from steel plate.
32. A solid fuel stove according to any of claims 29-31, further comprising a fire door coupled to the front frame of the outer stove body structure such that it can be moved between at least an open position in which the opening is exposed and a closed position in which the opening is covered.
33. A solid fuel stove substantially as described herein with reference to the accompanying drawings.
34. A method of manufacturing a solid fuel stove in accordance with any preceding claim, the method comprising: forming an inner stove body structure at least partly defining the rear side and the opposing sides of the firebox; forming an outer stove body structure having opposing outer lateral side panels at least partly defining the opposing outer lateral sides of the stove and having a front frame defining an opening for providing access to the interior of the firebox; locating the outer stove body structure around the inner stove body structure to at least partly define at least one secondary air duct between the inner and outer stove body structures; and attaching the inner and outer stove body structures together.
35. A method according to claim 34, wherein forming the inner stove body structure comprises bending and/or welding steel plate.
36. A method according to claim 34 or 35, wherein forming the outer stove body structure comprises bending and/or welding steel plate.
37. A method according to any of claims 34-36, wherein attaching the inner and outer stove body structures together comprises welding them together.
38. A method according to claim 34 and substantially as described herein.