EP0530126B1 - Woodburning stove with glass portion and means for the cleaning thereof - Google Patents
Woodburning stove with glass portion and means for the cleaning thereof Download PDFInfo
- Publication number
- EP0530126B1 EP0530126B1 EP19920610059 EP92610059A EP0530126B1 EP 0530126 B1 EP0530126 B1 EP 0530126B1 EP 19920610059 EP19920610059 EP 19920610059 EP 92610059 A EP92610059 A EP 92610059A EP 0530126 B1 EP0530126 B1 EP 0530126B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- box
- air
- chamber
- stove
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B13/00—Details solely applicable to stoves or ranges burning solid fuels
- F24B13/004—Doors specially adapted for stoves or ranges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B5/00—Combustion-air or flue-gas circulation in or around stoves or ranges
- F24B5/02—Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves
- F24B5/021—Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves combustion-air circulation
- F24B5/025—Supply of secondary air for completing combustion of fuel
Definitions
- the invention relates to a woodburing stove with a closed fire box and with a glass portion mounted in the front part of the stove, preferably in the door of the stove, and with a built-in heat exchanger comprising a closed chamber to which air is supplied and led out through a slot at the upper edge of the glass portion to produce a blanket of air which extends along the rear surface of the glass portion.
- the glass portion suffers a serious drawback, namely that it has a marked tendency to become sullied by soot and layers of condensate. These can be burned firmly into the glass portion so that dangerously corrosive means have to be used to dissolve and remove them.
- the DE-A-4 003 779 describes a stove with a closed fire box and with a glass portion mounted in the front part and with a build-in heat exchanger above the glass portion, from which hot air is flowing towards the inner part of the glass portion, and thereby cleaning the glass portion.
- the EP-A-O 250 239 describes a stove, which in this relation is similar to the above mentioned stove.
- the stove according to the invention in which the box extends into the fire box or a part of the fire box above the fire place, and in which there is inserted a plate in the chamber, which extends from the front part up to a distance from the rear wall of the chamber, and in such a manner that the inflowing air passes through the chamber's upper part before being led back through the chamber's lower part for outflow through the slot, has first and foremost a hitherto-unknown efficiency for reasons of the effective heating of the airflow for the cleaning of the glass portion.
- the air is led out via a slot in the front of the box, so that after being being sucked into the box it is heated directly by the flue gases by convection, and is thereby forced out at a considerable rate.
- the flue gases can sweep the box on all sides with the exception of the front, which results in a quick and effective exhange of heat, and by providing the box with an internal dividing plate, the path taken by the air through the box can be increased, hereby making the convection heating as efficient as possible.
- the heat exchanger As disclosed in claim 2, by allowing the heat exchanger to extend for the whole breadth of the fire box and up to a distance from its rear wall, the hot flue gases will be led directly against the bottom of the exchanger box and thereafter pass along the top of the box before they leave the stove, which results in an optimum exchange of heat and utilization of the heat content of the flue gases. This is of particular importance when the stove is being lit.
- Fig. 1 shows a stove 1 seen from the front.
- the example shown has a door which is provided with a transparent glass portion 4 which is set into a frame 3.
- the stove door can be opened and closed, and the fire box can be observed through the glass.
- the heat exchanger is indicated lying behind the opening 7 by stippled lines.
- Fig. 2 shows the inside of the stove.
- the fire box 19 which extends throughout the inside of the stove, is lined with firebricks in a commonly-known manner.
- the heat exchanger is also seen in the form of a box 12 which is open to the front and provided with fixing plates 10 around the air supply opening, as indicated in fig. 1
- the actual box 12 is secured to the front part 23 of the stove by means of bolts or screws 11.
- the heat exchanger will be described in more detail later.
- a plate 17 which has a bent-down rear edge to form a baffle 18 for the flow of flue gas.
- the flue gas is hereby slowed down and also redirected and led upwards towards a turning plate 20 secured to the rear wall of the stove.
- This plate leads the upwardly-flowing gases across the upper side of the heat exchanger, and from here back again before they leave the stove through the discharge pipe 6.
- the heat exchanger itself will now be described with reference to fig. 3.
- the box 12 is configured as a rectangular box which is relatively flat and, as shown in the drawing, is made up of a shroud and a bottom.
- an intermediate wall 9 which extends from the open front end to a distance from the rear wall 26.
- the box is thus divided into an upper chamber 13, which opens out directly at the opening 7, so that the flow of the flue gas through the chamber is led down into a lower chamber 14, the front of which opens out into a funnel-like slot 15, in that the front of the plate has a bent-down portion 16 to form an inclined side wall.
- the angle of the downwardly-bent part 16 will depend on the height of the fire box 19 in the individual stove, in that it is important that that part of the air stream which constitutes the primary air reaches into the stove in sufficient amounts.
- the breadth of the slot 15 is chosen in accordance with the extent of the glass portion 4, and will normally be between 5 and 7 mm, i.e. considerably less than the clearance in the chamber 14.
- a gasket or packing string 27 is inserted between the front part 23 and the fixing plate 10, to ensure airtightness.
- both the lower air valve 5 and the sliding damper 7 can be fully open, hereby leading an ample amount of primary air to the fire.
- the lower air valve 5 can be closed.
- the air 25 which is hereafter led through the heat exchanger will be able to deliver the necessary primary and secondary air to the fire.
- the air 22 is thus preheated, after which it passes down into the lower chamber 14 where the higher air temperature of up to 250°C is achieved when the stove is in operation.
- the volume of air is hereby doubled, and since the outlet slot 15 has a reduced flow clearance in relation to the chamber 14, the flow rate of the hot air 24 becomes very considerable. This results in the effective flow along the rear surface of the glass portion 4, which is hereby heated to more than 150°C, whereby any risk of sooting-up and condensation is excluded.
- the outflow of hot air 25 is used as primary and secondary air, whereby the complete combustion is achieved and at the same time the glass portion is effectively held clean.
- the stove thus has a very high degree of efficiency, while the need for maintenance is minimal.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid-Fuel Combustion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
- The invention relates to a woodburing stove with a closed fire box and with a glass portion mounted in the front part of the stove, preferably in the door of the stove, and with a built-in heat exchanger comprising a closed chamber to which air is supplied and led out through a slot at the upper edge of the glass portion to produce a blanket of air which extends along the rear surface of the glass portion.
- Stoves with glass portions through which the fire can be observed are very widespread, the reason being that they hereby combine the advantage of the stove's visible fire with the advantages of the closed stove from the point of view of combustion.
- However, the glass portion suffers a serious drawback, namely that it has a marked tendency to become sullied by soot and layers of condensate. These can be burned firmly into the glass portion so that dangerously corrosive means have to be used to dissolve and remove them.
- Such deposits on the glass portion are practically impossible to avoid, especially when the stove has been lit and for a short time afterwards, when the surface temperature of the glass portion lies below the dewpoint of the condensate, which is around 150°C.
- Different constructions are known for the generation of an air flow to prevent these deposits, i.e. a flow of air along the inner side of the glass portion, but these constructions have not proven to function in a satisfactory manner.
- From the descriptions of Danish patent application no. 3134/87 and American patent no. 4,941,451, stoves are known wherein preheated air is led down over the glass portion through a gap which extends along the upper edge of the glass portion. The heating of the air is effected by passing it through an opening at the bottom of the stove and leading it up through channels in the sides of the fire box, in which the air is heated, after which it is passed through the gap above the glass portion.
- The DE-A-4 003 779 describes a stove with a closed fire box and with a glass portion mounted in the front part and with a build-in heat exchanger above the glass portion, from which hot air is flowing towards the inner part of the glass portion, and thereby cleaning the glass portion.
- The EP-A-O 250 239 describes a stove, which in this relation is similar to the above mentioned stove.
- However, these known constructions have a very low degree of efficiency, mainly because of the slow heating of the air. This is due first and foremost to the fact that the hot flue gas sweeps only the inner side of the channels, whereby the heat exchanging becomes inadequate, particularly in the ignition phase when the risk of soot and condensation deposits is at its greatest.
- The stove according to the invention, in which the box extends into the fire box or a part of the fire box above the fire place, and in which there is inserted a plate in the chamber, which extends from the front part up to a distance from the rear wall of the chamber, and in such a manner that the inflowing air passes through the chamber's upper part before being led back through the chamber's lower part for outflow through the slot, has first and foremost a hitherto-unknown efficiency for reasons of the effective heating of the airflow for the cleaning of the glass portion.
- This is due first and foremost to the configuration and positioning of the heat exchanger, in that the supply of air takes place directly to the heat exchanger, and because this is placed directly above the bottom of the fire box in the flow of flue gas, thus ensuring that the inflowing air is heated as quickly as possible.
- The air is led out via a slot in the front of the box, so that after being being sucked into the box it is heated directly by the flue gases by convection, and is thereby forced out at a considerable rate.
- By allowing the heat exchanger box to project freely into the fire box, the flue gases can sweep the box on all sides with the exception of the front, which results in a quick and effective exhange of heat, and by providing the box with an internal dividing plate, the path taken by the air through the box can be increased, hereby making the convection heating as efficient as possible.
- When the intake of air through the heat exchanger consists solely of primary and secondary combustion air, the effect of this air flow can be increased, in that there is hereby achieved not only a completely reliable cleaning of the glass portion, but also a perfect combustion due to the pre-heated air.
- As disclosed in
claim 2, by allowing the heat exchanger to extend for the whole breadth of the fire box and up to a distance from its rear wall, the hot flue gases will be led directly against the bottom of the exchanger box and thereafter pass along the top of the box before they leave the stove, which results in an optimum exchange of heat and utilization of the heat content of the flue gases. This is of particular importance when the stove is being lit. - As disclosed in
claim 3, by providing the chamber with a plate, it is a simple matter to fashion the box and the plate in accordance with the conditions in the fire box of the relevant stove. - As disclosed in
claim 4, by bending-down the lower part of the plate, the run-off speed of the flue gases under the heat exchanger will be slowed down, which results in an effective convection. - Finally, as disclosed in
claim 5, it is expedient to allow the slot to have a relatively small breadth, in that the speed of the air through the slot is hereby considerably increased due to the heating of the air and its subsequent expansion in volume. This provides the strongest possible air flow. - An example embodiment according to the invention will be explained in more detail in the following with reference to the drawing, where
- fig. 1
- shows a stove seen from the front,
- fig. 2
- shows a section through the stove seen in the direction II-II in fig. 1, and
- fig. 3
- shows an enlarged section through the heat exchanger.
- Fig. 1 shows a stove 1 seen from the front. The example shown has a door which is provided with a
transparent glass portion 4 which is set into aframe 3. The stove door can be opened and closed, and the fire box can be observed through the glass. - Below the door there is mounted an
air valve 5, and at the top of the stove can be seen the connection 6 for a not-shown discharge pipe. - Finally, above the door there is an
elongated opening 7, behind which lies asliding damper plate 2 mounted with ahandle 8 by which it can be moved. - The heat exchanger is indicated lying behind the opening 7 by stippled lines.
- Fig. 2 shows the inside of the stove. In the example shown, the
fire box 19, which extends throughout the inside of the stove, is lined with firebricks in a commonly-known manner. - The heat exchanger is also seen in the form of a
box 12 which is open to the front and provided withfixing plates 10 around the air supply opening, as indicated in fig. 1 - The
actual box 12 is secured to thefront part 23 of the stove by means of bolts orscrews 11. The heat exchanger will be described in more detail later. - On the rear wall 26 of the
box 12 there is mounted aplate 17 which has a bent-down rear edge to form abaffle 18 for the flow of flue gas. The flue gas is hereby slowed down and also redirected and led upwards towards aturning plate 20 secured to the rear wall of the stove. - This plate leads the upwardly-flowing gases across the upper side of the heat exchanger, and from here back again before they leave the stove through the discharge pipe 6.
- The heat exchanger itself will now be described with reference to fig. 3. The
box 12 is configured as a rectangular box which is relatively flat and, as shown in the drawing, is made up of a shroud and a bottom. - Inside the box there is secured an
intermediate wall 9 which extends from the open front end to a distance from the rear wall 26. The box is thus divided into anupper chamber 13, which opens out directly at the opening 7, so that the flow of the flue gas through the chamber is led down into alower chamber 14, the front of which opens out into a funnel-like slot 15, in that the front of the plate has a bent-down portion 16 to form an inclined side wall. The angle of the downwardly-bent part 16 will depend on the height of thefire box 19 in the individual stove, in that it is important that that part of the air stream which constitutes the primary air reaches into the stove in sufficient amounts. - The breadth of the
slot 15 is chosen in accordance with the extent of theglass portion 4, and will normally be between 5 and 7 mm, i.e. considerably less than the clearance in thechamber 14. - Between the
front part 23 and thefixing plate 10, a gasket orpacking string 27 is inserted to ensure airtightness. - When the stove is being lit, both the
lower air valve 5 and thesliding damper 7 can be fully open, hereby leading an ample amount of primary air to the fire. When the fuel has ignited and is burning, thelower air valve 5 can be closed. Theair 25 which is hereafter led through the heat exchanger will be able to deliver the necessary primary and secondary air to the fire. - When the
air 21 is sucked in through theopening 7, it first passes through theupper chamber 13, which is swept by theflue gas 28 before this leaves the stove through the discharge pipe. - The
air 22 is thus preheated, after which it passes down into thelower chamber 14 where the higher air temperature of up to 250°C is achieved when the stove is in operation. - The volume of air is hereby doubled, and since the
outlet slot 15 has a reduced flow clearance in relation to thechamber 14, the flow rate of thehot air 24 becomes very considerable. This results in the effective flow along the rear surface of theglass portion 4, which is hereby heated to more than 150°C, whereby any risk of sooting-up and condensation is excluded. - With the known heat exchangers, it has not hitherto been possible to achieve this high airflow and temperature.
- Hereafter, the outflow of
hot air 25 is used as primary and secondary air, whereby the complete combustion is achieved and at the same time the glass portion is effectively held clean. - The stove thus has a very high degree of efficiency, while the need for maintenance is minimal.
Claims (5)
- Woodburning stove with a closed fire box (19) and with a glass portion mounted in the front part of the stove, preferably in the door of the stove, and with a built-in heat exchanger comprising a closed chamber (13,14) to which air is supplied and led out through a slot at the upper edge of the glass portion to produce a blanket of air which extends along the rear surface of the glass portion, said chamber being configured in a closed box (12) which is mounted above the glass portion (4) on the inside of the front part (23), and wherein the flow of air (21) to the chamber (13, 14) is effected via openings (7) directly through the front part (23), characterized in that the box (12) extends into the fire box (19) or a part of the fire box above the fireplace, and that in the chamber (13, 14) there is inserted a plate (9) which extends from the front part (23) up to a distance from the rear wall (26) of the chamber, and in such a manner that the inflowing air (22) passes through the chamber's upper part (13) before being led back through the chamber's lower part (14) for outflow through the slot (15).
- Heat exchanger according to claim 1, characterized in that the box (12) extends for the full breadth of the fire box (19) and up to a distance from its rear wall, thus leaving a gap for the discharge of the flue gases (28).
- Heat exchanger according to claim 2, characterized in that the box (12) is provided with a rearwardly-extending plate (17, 18), so that the box and the plate together extend up to a distance from the rear wall of the fire box (19).
- Heat exchanger according to claim 3, characterized in that the rear edge (18) of the plate is bent downwards to form a flue-gas pocket under the heat exchanger.
- Heat exchanger according to any one of claims 1-4, characterized in that the slot (15) has a breadth of about 5-7 mm for the whole of its length.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK153591A DK171475B1 (en) | 1991-08-30 | 1991-08-30 | Fireplaces with glass partition and cleaning means |
DK1535/91 | 1991-08-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0530126A2 EP0530126A2 (en) | 1993-03-03 |
EP0530126A3 EP0530126A3 (en) | 1993-05-12 |
EP0530126B1 true EP0530126B1 (en) | 1996-01-17 |
Family
ID=8105839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920610059 Expired - Lifetime EP0530126B1 (en) | 1991-08-30 | 1992-08-21 | Woodburning stove with glass portion and means for the cleaning thereof |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0530126B1 (en) |
DE (1) | DE69207680T2 (en) |
DK (1) | DK171475B1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2912491A1 (en) * | 2007-02-13 | 2008-08-15 | Labattu Michel | Frontal secondary air preheating device for e.g. wood-burning stove, has container with bends and air passages to allow free circulation of frontal secondary air in device in zigzag manner, where air passages are constituted of openings |
AT504892B1 (en) * | 2007-10-04 | 2008-09-15 | Windhager Zentralheizung Techn | RAUMHEIZEINRICHTUNG |
CA2691409C (en) * | 2009-01-31 | 2018-07-03 | Landy Vent Uk Limited | Combustion apparatus |
ITRA20090011A1 (en) * | 2009-03-24 | 2010-09-25 | Malta Ing Michele | CONDENSING STOVE |
EP2455666A1 (en) | 2010-11-17 | 2012-05-23 | József Simkó | Closed stove with improved efficiency |
DE202011051990U1 (en) | 2011-11-16 | 2012-01-18 | Lars Betzner | Stove with improved efficiency |
CN104390242A (en) * | 2014-11-10 | 2015-03-04 | 昆山富凌能源利用有限公司 | Secondary oxygen supply energy saving oven core |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4343289A (en) * | 1980-03-21 | 1982-08-10 | Zimmerman Valentine J | Wood burning stove |
AT377597B (en) * | 1981-07-31 | 1985-04-10 | Kent Heating Ltd | OVEN |
US4683868A (en) * | 1986-04-09 | 1987-08-04 | Vermont Castins, Inc. | Wood burning stove having glass cleaning system |
GB8615153D0 (en) * | 1986-06-20 | 1986-07-23 | Ti Parkray Ltd | Solid fuel heating appliances |
AT403318B (en) * | 1989-02-10 | 1998-01-26 | Karl Stefan Riener | OVEN WITH AN INSERT DIVIDING THE COMBUSTION CHAMBER |
-
1991
- 1991-08-30 DK DK153591A patent/DK171475B1/en not_active IP Right Cessation
-
1992
- 1992-08-21 EP EP19920610059 patent/EP0530126B1/en not_active Expired - Lifetime
- 1992-08-21 DE DE1992607680 patent/DE69207680T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DK153591D0 (en) | 1991-08-30 |
DE69207680D1 (en) | 1996-02-29 |
EP0530126A2 (en) | 1993-03-03 |
DK171475B1 (en) | 1996-11-11 |
DE69207680T2 (en) | 1996-08-14 |
DK153591A (en) | 1993-03-01 |
EP0530126A3 (en) | 1993-05-12 |
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