WO2008010256A2 - Double fuel burning stove - Google Patents

Double fuel burning stove Download PDF

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Publication number
WO2008010256A2
WO2008010256A2 PCT/IT2007/000503 IT2007000503W WO2008010256A2 WO 2008010256 A2 WO2008010256 A2 WO 2008010256A2 IT 2007000503 W IT2007000503 W IT 2007000503W WO 2008010256 A2 WO2008010256 A2 WO 2008010256A2
Authority
WO
WIPO (PCT)
Prior art keywords
hearth
fact
double
burning stove
fuel burning
Prior art date
Application number
PCT/IT2007/000503
Other languages
French (fr)
Other versions
WO2008010256A3 (en
Inventor
Antonio Ungaro
Original Assignee
Ungaro Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38957206&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2008010256(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ungaro Srl filed Critical Ungaro Srl
Priority to CA002657917A priority Critical patent/CA2657917A1/en
Publication of WO2008010256A2 publication Critical patent/WO2008010256A2/en
Publication of WO2008010256A3 publication Critical patent/WO2008010256A3/en
Priority to US12/354,381 priority patent/US20090120423A1/en

Links

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
    • F24B1/00—Stoves or ranges
    • F24B1/02—Closed stoves
    • F24B1/026—Closed stoves with several combustion zones
    • 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
    • F24B9/00—Stoves, ranges or flue-gas ducts, with additional provisions for heating water 
    • F24B9/04—Stoves, ranges or flue-gas ducts, with additional provisions for heating water  in closed containers

Definitions

  • the object of the present invention is a double fuel burning stove that is capable of functioning with two different fuels, both with a solid fuel in pieces or logs such as wood and with a loose solid fuel such as sawdust, wood pellets etc., and with gaseous fuel and liquid fuel.
  • Solid fuel fired stoves have been in use for a long time ⁇ nd, above all in those places near to woods, are frequently used because of the availability of wood both in quantity and because of its low cost, and represent a form of heating that is widely used in these areas.
  • Patent DE3632023 describes a double fuel burning stove with two hearths. This stove presents, however, the inconvenience of having two communicating hearths and thus of having problems with the air flow necessary for combustion in the two hearths.
  • Patent Application FR-A-2745371 describes a coal and wood fired stove that can be transformed into a stove with a burner for liquid or gaseous fuels.
  • Patent EP 1427966 also describes a double fuel burning stove with two burners, but it too has the disadvantage of having the two hearths communicating between themselves and thus of having problems with the flow of the air necessary for the combustion of the two hearths.
  • the present invention proposes to overcome the difficulties and disadvantages present in the solutions on sale at present.
  • the principal aim of the present invention is to create a double fuel burning stove formed by an external casing, characterised by the fact that said stove is composed of two hearths, a first hearth for one fuel and a second hearth for a second fuel, the second hearth being placed above the first hearth and the second hearth is completely separated from the first hearth.
  • the principal characteristic of the invention is that of having a stove that can function with two different fuels, for example wood that is readily available in wooded areas and another fuel, for example pellets, that is easily handled. The wood fuel is fed by hand while the pellets can be fed automatically.
  • the two fuels can be fed into one of the two hearths of the stove contemporarily or into only one of the two, according to whichever of the fuels is more readily available or economically convenient or better adapted at the moment of use.
  • the stove can be brought automatically to the desired temperature with pellets when one is at a distance from it, while when one is near to the stove it can be fed with wood.
  • the stove also permits the pellets to be fed automatically if for any reason the user does not feed the wood-fired hearth with the necessary quantity of wood.
  • first and the second fuels are solids and that one of the two fuels is a loose solid fuel.
  • first hearth has a first flue and that the second hearth has a second flue and that said flues are separated.
  • second hearth has separate aeration systems.
  • a heat exchanger is placed below the second hearth.
  • Another characteristic is given by the fact that the first hearth has a first door and that the second hearth has a second door.
  • Another characteristic is given by the fact that the second hearth is completely separated from the first hearth by means of a double-walled box that surrounds said second hearth.
  • the heat exchanger positioned below the second hearth is a heat exchanger for the heating of the water.
  • Another characteristic is given by the fact that the double-walled box is a heat exchanger for the heating of the air.
  • first hearth is a. hearth for wood and the second hearth is a hearth for loose solid fuel.
  • first hearth is a hearth for loose solid fuel and the second hearth is a hearth for wood.
  • Figure 1 represents a section of the double fuel burning stove, object of the present invention.
  • a double fuel burning stove is represented, that is formed by an external casing 1 , that can be of sheet-steel with a cavity space 2 that separates an internal metal sheet 3 or which can be an external sheet 1 insulated by refractory material or ceramic both internally and externally.
  • the double fuel burning stove presents a first hearth 4 and a second hearth 5.
  • the second hearth 5 is placed above the first hearth 4.
  • the second hearth 5 is completely separated from the first hearth by means of a double-walled box 6 that surrounds said second hearth 5 at least on the bottom and on three sides.
  • the first hearth 4 and the second hearth 5 have separate flues, respectively the first hearth 4 has a first flue 8 and the second hearth 5 has a second flue 9.
  • the first hearth 4 has a first door 10 provided with a first handle 12, just as the second hearth 5 has a second door 11 provided with a second handle 13. Both the first hearth 4 and the second hearth 5 have separate aeration systems that are controlled externally, to increase or decrease the air necessary for combustion, which for simplicity's sake are not shown.
  • a heat exchanger 14 is positioned, which has the double function of heating a fluid contained within it and of protecting the second hearth 5 from excessive heating from the effect of the flames that can arrive directly from the first hearth 4 positioned immediately below it.
  • the stove shown in figure 1 the stove is a double fuel burning stove and presents the first hearth 4 that is fuelled by wood and the second shearth 5 that is fuelled by a loose fuel (for example sawdust, wood pellets etc.).
  • the second hearth 5 is positioned above the first hearth 4.
  • the double-walled box 6 is a water-jacket that surrounds the second, hearth 5 at least on the bottom and on three sides and separates it completely from the first hearth 4.
  • the water heated in the water-jacketed box 6 can be used for domestic heating and a heat exchanger for hot sanitary water 7 can be placed in the water-jacket.
  • the first hearth 4 and the second hearth 5 have separate flues (8 and 9).
  • the smoke from the combustion in the first hearth 4 in passing to the first flue 8 brushes against and thus heats the external surface of the water-jacketed box 6, while the smoke from the combustion in the second hearth 5 brushes against and thus heats the internal surface of the water-jacketed box 6.
  • Both the first hearth 4 and the second hearth 5 have separate aeration .systems, externally controlled, to increase or decrease the air necessary for combustion, which for simplicity's sake are not shown.
  • a heat exchanger 14 is positioned, and which has the double function of heating a fluid contained within it and of protecting the second hearth 5 from excessive heating caused by the , flames that can arrive directly from the first hearth 4 positioned directly below it.
  • the stove can also be composed of the first hearth 4 for loose solid fuels placed in the lower part and of the second hearth 5, placed above it, for wood, but can also be composed of the first hearth for wood placed in the lower part and of the second hearth, placed above it, for loose solid fuels.
  • the double-walled box 6 can be a water-jacket, or it can be substituted by a heat exchanger for heating the air.
  • the heat exchanger 14 can function with water or it can be substituted by an air heat exchanger.
  • This invention has numerous advantages and will permit to overcome problems which could not be achieved by heating systems on the market today.

Abstract

Double fuel burning stove formed by an external casing, characterised by the fact that said stove is composed of two hearths, a first hearth (4) for one fuel and a second hearth (5) for a second fuel, the second hearth (5) being placed above the first hearth (4) and the second hearth (5) is completely separated from the first hearth (4).

Description

DOUBLE FUEL BURNING STOVE Technical field of the patent
The object of the present invention is a double fuel burning stove that is capable of functioning with two different fuels, both with a solid fuel in pieces or logs such as wood and with a loose solid fuel such as sawdust, wood pellets etc., and with gaseous fuel and liquid fuel.
State of the Art
Solid fuel fired stoves have been in use for a long time^nd, above all in those places near to woods, are frequently used because of the availability of wood both in quantity and because of its low cost, and represent a form of heating that is widely used in these areas.
Recently, stoves using loose solid fuels such as sawdust, wood pellets, stones from olives or other dried fruits, olive residue etc. have been developed. Loose solid fuel has, in respect to wood, the advantage of being more easily transportable. Furthermore, a loose solid-fuel stove can be automated and permits lighting and putting out the stove by a timer or by remote control. Gas and liquid fuelled stoves have also been in use for a long time. Bi-fuelled stoves are also present on the market, that have attempted to unite the advantages of a specific fuel with those of another fuel. For example, in order to unite the advantages of wood, above all its economy, to those of loose solid fuels, above all easy to handle, stoves have been designed that can function with both fuels.
Patent DE3632023 describes a double fuel burning stove with two hearths. This stove presents, however, the inconvenience of having two communicating hearths and thus of having problems with the air flow necessary for combustion in the two hearths.
The patent Application FR-A-2745371 describes a coal and wood fired stove that can be transformed into a stove with a burner for liquid or gaseous fuels. Patent EP 1427966 also describes a double fuel burning stove with two burners, but it too has the disadvantage of having the two hearths communicating between themselves and thus of having problems with the flow of the air necessary for the combustion of the two hearths. This disadvantage, present both in DE3632023 and in FR-A-2745371 and in EP 1427866, does not permit the simultaneous use of the two fuels or, if it does permit their use, it does so with the loss of the quality of the combustion since the air for the combustion of a fuel cannot be dosed in a specific way for that fuel; in general if two fuels need a different dosing of the air for combustion then the air for combustion will be dosed in such a way that it is an average of the air for one fuel and for that for the other fuel. In this way it will not be possible to obtain a high yield from the combustion.
The present invention proposes to overcome the difficulties and disadvantages present in the solutions on sale at present. The principal aim of the present invention is to create a double fuel burning stove formed by an external casing, characterised by the fact that said stove is composed of two hearths, a first hearth for one fuel and a second hearth for a second fuel, the second hearth being placed above the first hearth and the second hearth is completely separated from the first hearth. The principal characteristic of the invention is that of having a stove that can function with two different fuels, for example wood that is readily available in wooded areas and another fuel, for example pellets, that is easily handled. The wood fuel is fed by hand while the pellets can be fed automatically.
The two fuels can be fed into one of the two hearths of the stove contemporarily or into only one of the two, according to whichever of the fuels is more readily available or economically convenient or better adapted at the moment of use. For example the stove can be brought automatically to the desired temperature with pellets when one is at a distance from it, while when one is near to the stove it can be fed with wood. The stove also permits the pellets to be fed automatically if for any reason the user does not feed the wood-fired hearth with the necessary quantity of wood.
Another characteristic is given by the fact that both the first and the second fuels are solids and that one of the two fuels is a loose solid fuel. Another characteristic is given by the fact that the first hearth has a first flue and that the second hearth has a second flue and that said flues are separated. Another characteristic is given by the fact that both the first and the second hearths have separate aeration systems. Another characteristic is given by the fact that a heat exchanger is placed below the second hearth.
Another characteristic is given by the fact that the first hearth has a first door and that the second hearth has a second door.
Another characteristic is given by the fact that the second hearth is completely separated from the first hearth by means of a double-walled box that surrounds said second hearth.
Another characteristic is given by the fact that the double-walled box that surrounds said second hearth is present at least on the bottom and on three sides.
Another characteristic is given by the fact that the double-walled box is a water- jacket.
Another characteristic is given by the fact that the heat exchanger positioned below the second hearth is a heat exchanger for the heating of the water. Another characteristic is given by the fact that the double-walled box is a heat exchanger for the heating of the air.
Another characteristic is given by the fact that the heat exchanger positioned below the second hearth is an air heat exchanger.
Another characteristic is given by the fact that the first hearth is a. hearth for wood and the second hearth is a hearth for loose solid fuel. Another characteristic is given by the fact that the first hearth is a hearth for loose solid fuel and the second hearth is a hearth for wood. Other characteristics and advantages of the invention will appear clear from the following description of some methods of creating the invention, given as non- limiting examples in figure 1.
A brief description of the figures
Figure 1 represents a section of the double fuel burning stove, object of the present invention.
Description of the invention
In figure 1 a double fuel burning stove is represented, that is formed by an external casing 1 , that can be of sheet-steel with a cavity space 2 that separates an internal metal sheet 3 or which can be an external sheet 1 insulated by refractory material or ceramic both internally and externally. The double fuel burning stove presents a first hearth 4 and a second hearth 5. The second hearth 5 is placed above the first hearth 4. The second hearth 5 is completely separated from the first hearth by means of a double-walled box 6 that surrounds said second hearth 5 at least on the bottom and on three sides. The first hearth 4 and the second hearth 5 have separate flues, respectively the first hearth 4 has a first flue 8 and the second hearth 5 has a second flue 9.
The smoke from the combustion in the first hearth 4 in passing to the first flue 8 brushes against and thus heats the external surface of the double-walled box 6, while the smoke from the combustion in the second hearth 5 brushes against and thus heats the internal surfaces of the double-walled4 box 6. The first hearth 4 has a first door 10 provided with a first handle 12, just as the second hearth 5 has a second door 11 provided with a second handle 13. Both the first hearth 4 and the second hearth 5 have separate aeration systems that are controlled externally, to increase or decrease the air necessary for combustion, which for simplicity's sake are not shown.
Below the second hearth 5 a heat exchanger 14 is positioned, which has the double function of heating a fluid contained within it and of protecting the second hearth 5 from excessive heating from the effect of the flames that can arrive directly from the first hearth 4 positioned immediately below it. In the stove shown in figure 1 the stove is a double fuel burning stove and presents the first hearth 4 that is fuelled by wood and the second shearth 5 that is fuelled by a loose fuel (for example sawdust, wood pellets etc.). The second hearth 5 is positioned above the first hearth 4. The double-walled box 6 is a water-jacket that surrounds the second, hearth 5 at least on the bottom and on three sides and separates it completely from the first hearth 4. The water heated in the water-jacketed box 6 can be used for domestic heating and a heat exchanger for hot sanitary water 7 can be placed in the water-jacket. The first hearth 4 and the second hearth 5 have separate flues (8 and 9). The smoke from the combustion in the first hearth 4 in passing to the first flue 8 brushes against and thus heats the external surface of the water-jacketed box 6, while the smoke from the combustion in the second hearth 5 brushes against and thus heats the internal surface of the water-jacketed box 6. Both the first hearth 4 and the second hearth 5 have separate aeration .systems, externally controlled, to increase or decrease the air necessary for combustion, which for simplicity's sake are not shown.
Below the second hearth 5 a heat exchanger 14 is positioned, and which has the double function of heating a fluid contained within it and of protecting the second hearth 5 from excessive heating caused by the, flames that can arrive directly from the first hearth 4 positioned directly below it.
The stove can also be composed of the first hearth 4 for loose solid fuels placed in the lower part and of the second hearth 5, placed above it, for wood, but can also be composed of the first hearth for wood placed in the lower part and of the second hearth, placed above it, for loose solid fuels.
Furthermore, the double-walled box 6 can be a water-jacket, or it can be substituted by a heat exchanger for heating the air. The heat exchanger 14 can function with water or it can be substituted by an air heat exchanger.
This invention is not limited to the representation given by the figures but can be perfected and modified by men expert in the art without altering the aim of the patent.
This invention has numerous advantages and will permit to overcome problems which could not be achieved by heating systems on the market today.

Claims

1) Double fuel burning stove formed by an external casing, characterised by the fact that said stove is composed of two hearths, a first hearth (4) for one fuel and a second hearth (5) for a second fuel, the second hearth (5) being placed above the first hearth (4) and the second hearth (5) is completely separated from the first hearth (4).
2) Double fuel burning stove according to claim 1 characterised by the fact that both the first and the second fuels are solids and that one of the two fuels is a loose solid fuel.
3) Double fuel burning stove according to claim 1 characterised by the fact that the first hearth (4) has a first flue (8) and that the second hearth (5) has a second flue (9) and that said flues are separated.
4) Double fuel burning stove according to claim 1 characterised by the fact that both the first (4) and the second hearths (5) have separate aeration systems.
5) Double fuel burning stove according to claim 1 characterised by the fact that a heat exchanger (14) is placed below the second hearth (5). 6) Double fuel burning stove according to claim 1 characterised by the fact that the first hearth (4) has a first door (10) and that the second hearth (5) has a second door (11).
7) Double fuel burning stove according to claim 1 characterised by the fact that the second hearth is completely separated from the first hearth (4) by means of a double-walled box (6) that surrounds said second hearth (5).
8) Double fuel burning stove according to claim 1 characterised by the fact that the double-walled box (6) that surrounds said second hearth (5) is present at least on the bottom and on three sides.
9) Double fuel burning stove according to claim 1 characterised by the fact that the double-walled box (6) is a water-jacket.
10) Double fuel burning stove according to claim 1 characterised by the fact that the heat exchanger (14) positioned below the second hearth (5) is a heat exchanger for the heating of the water.
11)Double fuel burning stove according to claim 1 characterised by the fact that the double-walled box (6) is a heat exchanger for the heating of the air. 12) Double fuel burning stove according to claim 1 characterised by the fact that the heat exchanger (14) positioned below the second hearth (5) is an air heat exchanger.
13) Double fuel burning stove according to claim 1 characterised by the fact that the first hearth (4) is a hearth for wood and the second hearth (5) is a hearth for loose solid fuel.
v
14) Double fuel burning stove according to claim 1 characterised by the fact that the first hearth (4) is a hearth for loose solid fuel and the second hearth (5) is a hearth for wood.
PCT/IT2007/000503 2006-07-17 2007-07-16 Double fuel burning stove WO2008010256A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002657917A CA2657917A1 (en) 2006-07-17 2007-07-16 Double fuel burning stove
US12/354,381 US20090120423A1 (en) 2006-07-17 2009-01-15 Double fuel burning stove

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITCZ2006A000019 2006-07-17
IT000019A ITCZ20060019A1 (en) 2006-07-17 2006-07-17 DOUBLE FUEL STOVE

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/354,381 Continuation US20090120423A1 (en) 2006-07-17 2009-01-15 Double fuel burning stove

Publications (2)

Publication Number Publication Date
WO2008010256A2 true WO2008010256A2 (en) 2008-01-24
WO2008010256A3 WO2008010256A3 (en) 2008-04-24

Family

ID=38957206

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2007/000503 WO2008010256A2 (en) 2006-07-17 2007-07-16 Double fuel burning stove

Country Status (5)

Country Link
US (1) US20090120423A1 (en)
CA (1) CA2657917A1 (en)
IT (1) ITCZ20060019A1 (en)
RU (1) RU2409789C2 (en)
WO (1) WO2008010256A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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DE19510263A1 (en) * 1994-03-25 1995-09-28 Tiba Ag Central heating boiler esp. for large pieces of wood
EP1427966A1 (en) * 2001-08-13 2004-06-16 Ungaro S.r.l. Double solid fuel burning stove

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1450039A (en) * 1922-10-13 1923-03-27 Howard James Combined wood and coal burning stove
DE908526C (en) * 1943-11-16 1954-04-08 Hovalwerk Ag Ospelt Cooking stove with built-in, double-walled boiler
FR2314443A1 (en) * 1975-06-09 1977-01-07 Self Climat Hot water boiler usable with alternative fuels - has separate combustion chambers above and below smoke box leading to water jacket
DE3614998A1 (en) * 1986-05-02 1987-11-05 Karl Flanderka Stove with two furnace chambers arranged one above the other
DE19510263A1 (en) * 1994-03-25 1995-09-28 Tiba Ag Central heating boiler esp. for large pieces of wood
EP1427966A1 (en) * 2001-08-13 2004-06-16 Ungaro S.r.l. Double solid fuel burning stove

Also Published As

Publication number Publication date
ITCZ20060019A1 (en) 2008-01-19
RU2009102267A (en) 2010-08-27
US20090120423A1 (en) 2009-05-14
CA2657917A1 (en) 2008-01-24
WO2008010256A3 (en) 2008-04-24
RU2409789C2 (en) 2011-01-20

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