EP0493345B1 - Wall-mounted gas boiler with premixing burner, particularly for domestic use - Google Patents
Wall-mounted gas boiler with premixing burner, particularly for domestic use Download PDFInfo
- Publication number
- EP0493345B1 EP0493345B1 EP91830573A EP91830573A EP0493345B1 EP 0493345 B1 EP0493345 B1 EP 0493345B1 EP 91830573 A EP91830573 A EP 91830573A EP 91830573 A EP91830573 A EP 91830573A EP 0493345 B1 EP0493345 B1 EP 0493345B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- burner
- chamber
- gas
- mixing chamber
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/0036—Dispositions against condensation of combustion products
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/14—Arrangements for connecting different sections, e.g. in water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/14—Arrangements for connecting different sections, e.g. in water heaters
- F24H9/148—Arrangements of boiler components on a frame or within a casing to build the fluid heater, e.g. boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
- F28F1/325—Fins with openings
Definitions
- This invention relates to a wall-mounted gas boiler with premixing burner, particularly useful for domestic use.
- this invention relates to a boiler of the type mentioned above, whose features are such as to make the technologies of premixing burners advantageously applicable to wall-mounted boilers of domestic type.
- atmospheric burners are mainly employed in technology of wall-mounted gas boilers, i.e. burners in which the flame is fed with gas, with the addition of primary air, such components being mixed before they enter the burner, as well as by secondary air which is present around the flame.
- the essential feature of such type of boiler consists in that, as air is present in abundant amount, optimal combustion conditions occur in the most different situations.
- boilers are characterized by combustion residues of polluting type, as well as by a low power density.
- the NO X oxides are made up of NO+NO2, and such compounds, on becoming dispersed in the atmosphere, react with water forming nitric acid, so giving rise to the well known acid rains.
- NO X occurs in the very core of the flame, at very high temperatures, so that the formation of NO X is very high in burners of the atmospheric type, wherein a very large flame is formed so that high temperature are reached.
- Such kind of burner realizes the combustion just of gas with the addition of primary air, such components being mixed upstream of the burner itself.
- JP-A-58085016 it is described a heating device provided with a pre-mixing device to regulate the air/gas ratio, said regulation being obtained by two distinct sensors 21 and 23.
- combustion occurs through the formation of a number of small flames, so that the temperature reached in each one of them is averaged and does not reach up to the values of the atmospheric-type burners.
- the structure of the pre-mix burner also has, in addition to the problem connected to the sophisticated technology involved, the problem arising from the noise produced by vibrations.
- the Applicant has developed a wall-mounted boiler for domestic use, wherein a pre-mix burner is provided which is capable of operating also in a modulated way and has a very compact structure.
- the boiler according to this invention is so realized as not to produce noise.
- the invention comprises a wall-mounted gas boiler, particularly useful for domestic employment, and of the type comprising a pre-mix burner, a heat exchanger, a circuit for conveying the combustion air, fan means for the circulation of said air a chamber for mixing air with the gas, and an opening upstream of said mixing chamber, in the air circulation circuit, said boiler being characterized in that said opening is provided with valve means and allows the dilution air to flow downstream the burner without being mixed with the gas present in the mixing chamber; said opening being of such a size that when it is fully closed by the valve, the burner works at the maximum power, whereas when the opening is completely open, the burner operates at the minimum power, said valve means being opened or closed on the basis of the water temperature in the heat exchanger, means being provided at the point corresponding to the mixing chamber in order to change the amount of gas introduced in proportion to the flowrate of the air flowing through the same, and in that said burner is provided laterally with holes that allow the passage of air that arrives from said opening directly above the burner itself.
- Said valve means will preferably be made up of a butterfly valve which is controlled by a step motor.
- the means employed for changing the amount of gas introduced into the mixing chamber can comprise, according to the present invention, two static-pressure tubes arranged respectively at the points corresponding to the outlet of the mixing chamber and to a reduction in the cross section downstream of said chamber and before the burner, said static-pressure tubes being connected to the valve for the introduction of gas.
- the mixing in the mix chamber is preferably realized counter-currently.
- the boiler according to this invention is realized by means of an outer container 1 which is made up of just three parts, i.e. a die-cast aluminum casing 2, a cover 3 and a lower Archimedean screw 4 for housing the fan 5.
- an outer container 1 which is made up of just three parts, i.e. a die-cast aluminum casing 2, a cover 3 and a lower Archimedean screw 4 for housing the fan 5.
- the structure realized between the casing 2 and the cover 3 provides two different sealing closures 6 and 7 (see in particular Figure 2) so as to realize two zones, respectively an inner zone 8 which is under pressure, and an outer zone 9 which is depressurized.
- the exchanger 12 and the pre-mix burner 13 are provided within the inner zone 8 on the guides 10 and 11 a slidable way.
- the container 1 so realized reduces the possibility of noise from vibration to a minimum.
- the presence of a double tight seal prevents any unburnt gas leakage from the inner zone 8 from becoming dispersed through the environment so that the unburnt gases are dispersed within the zone 9 and they come back into circulation in the depressurized part.
- a small window 15 which is made up of a transparent material is provided at the point corresponding to the burner 13, in order to observe the flame.
- the outer air enters from the outer pipe of the coaxial pipe 14 and flowing through the lateral passages of the zone 9 while it is sucked by the fan 5 arrives up to the Archimedean screw 4 which provides a mixing chamber 16 for mixing the air with the gas.
- the gas is in turn introduced into said chamber 16 through the nozzle 17 counter-currently with respect to air in order to obtain an optimal mixing.
- the gas-air mixture goes from the mixing chamber 16 towards the burner 13 flowing through a throttled portion 18.
- a hole 19 supplied with a butterfly valve 20 is provided on the path of air, upstream of the mixing chamber 16, so that air can be directly conveyed into the zone 8. Said air will flow directly above the burner 13 through the lateral holes 21 as will be disclosed in the following, without taking part in combustion.
- Two static-pressure tubes 22, 23 connected to the gas valve 24 are provided at the outlet of the mixing chamber 16, at the point corresponding to the throttled zone, said gas valve 24 being in turn connected to the nozzle 17.
- the fan 5 is provided with a motor 25.
- the exchanger 12 is made up of two arrays of alternate pipes 26 and 27, connected to the inlet 28 and to the outlet 29 of water circulating through the plant.
- the fins in the smoke passage are shaped laterally in such a way as to convey the outer smokes towards the pipes 27, and are provided below said pipes 27 with holes 30 for discharging heat in order to prevent them from receiving an excess amount of heat.
- the design selected in the realization and the arrangement of the burner 13 and the exchanger 12 allows a very compact boiler to be realized both in the horizontal and the vertical direction, so that such boiler can be embedded into a usual hanging housing.
- the boiler when is switched on by the user and is regulated for a water feed at 70°C, begins operating with the valve 20 in the position that closes the hole 19 fully.
- the pre-mix burners ask for a constant optimal regulation of mixing: indicatively, a gas-air mixture with a 30 % excess air amount with respect to the stoichiometric proportion.
- tha value of ⁇ p which is detected by them on the basis of the change in cross-section, is proportional to the value of the fluid (gas-air) flowrate that flows, even though the value of p keeps always positive.
- Said value of ⁇ p which is read by the valve 24 determines the amount of gas which is introduced into the mixing chamber 16.
- the boiler of this invention has been so realized as to modulate its power without the occurrence of condensation.
- the hole 19 is of such sizes that when it is fully closed by tha valve 19 the maximum power of the burner is employed, whereas when such hole is completely open, the burner is at the minimum power.
- an electronic device causes through a small step-motor the valve 20 to open.
- a part of the air instead of being conveyed into the chamber 16 is conveyed directly into the zone 8, above the burner 13 through the small holes 21.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Geometry (AREA)
- Gas Burners (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
Description
- This invention relates to a wall-mounted gas boiler with premixing burner, particularly useful for domestic use.
- More particularly, this invention relates to a boiler of the type mentioned above, whose features are such as to make the technologies of premixing burners advantageously applicable to wall-mounted boilers of domestic type.
- As is known, atmospheric burners are mainly employed in technology of wall-mounted gas boilers, i.e. burners in which the flame is fed with gas, with the addition of primary air, such components being mixed before they enter the burner, as well as by secondary air which is present around the flame.
- The essential feature of such type of boiler consists in that, as air is present in abundant amount, optimal combustion conditions occur in the most different situations.
- However, such boilers are characterized by combustion residues of polluting type, as well as by a low power density.
- Indeed, it is well known that carbon dioxide, water, oxygen, nitrogen and NOx are formed in combustion.
- The NOX oxides are made up of NO+NO₂, and such compounds, on becoming dispersed in the atmosphere, react with water forming nitric acid, so giving rise to the well known acid rains.
- The formation of NOX occurs in the very core of the flame, at very high temperatures, so that the formation of NOX is very high in burners of the atmospheric type, wherein a very large flame is formed so that high temperature are reached.
- Another kind of boilers already known is that in which a premixing (or premix) burner is provided, this kind of boiler being particularly employed in case of high powers, because the technology connected to the same is a very sophisticated and advanced one.
- Such kind of burner realizes the combustion just of gas with the addition of primary air, such components being mixed upstream of the burner itself.
- In JP-A-58085016 it is described a heating device provided with a pre-mixing device to regulate the air/gas ratio, said regulation being obtained by two
distinct sensors - It is obvious that it is necessary to have a gas/ air ratio always of optimal value, as well as an always intimate mixing in connection.
- It is just because of such requirements that in general this technology only is advisable for application to high power plants.
- However, the technical feature of said pre-mix burners are such as to make them interesting for the application also to domestic plants.
- Indeed, combustion occurs through the formation of a number of small flames, so that the temperature reached in each one of them is averaged and does not reach up to the values of the atmospheric-type burners.
- This means a combustion wherein a very low production of NOX occurs, in addition to a higher power density (value of about 1/10 with respect to the atmospheric boilers).
- Accordingly, a much less polluting combustion is obtained with respect to the combustion occurring in plants equipped with atmospheric burners.
- The structure of the pre-mix burner also has, in addition to the problem connected to the sophisticated technology involved, the problem arising from the noise produced by vibrations.
- Such drawback also has certainly not contributed to the employment of said type of burners in the field of wall-mounted boilers for domestic use.
- In the light of what has been discussed above, the Applicant has developed a wall-mounted boiler for domestic use, wherein a pre-mix burner is provided which is capable of operating also in a modulated way and has a very compact structure.
- Moreover, the boiler according to this invention is so realized as not to produce noise.
- Accordingly, the invention comprises a wall-mounted gas boiler, particularly useful for domestic employment, and of the type comprising a pre-mix burner, a heat exchanger, a circuit for conveying the combustion air, fan means for the circulation of said air a chamber for mixing air with the gas, and an opening upstream of said mixing chamber, in the air circulation circuit, said boiler being characterized in that said opening is provided with valve means and allows the dilution air to flow downstream the burner without being mixed with the gas present in the mixing chamber; said opening being of such a size that when it is fully closed by the valve, the burner works at the maximum power, whereas when the opening is completely open, the burner operates at the minimum power, said valve means being opened or closed on the basis of the water temperature in the heat exchanger, means being provided at the point corresponding to the mixing chamber in order to change the amount of gas introduced in proportion to the flowrate of the air flowing through the same, and in that said burner is provided laterally with holes that allow the passage of air that arrives from said opening directly above the burner itself.
- Said valve means will preferably be made up of a butterfly valve which is controlled by a step motor.
- The means employed for changing the amount of gas introduced into the mixing chamber can comprise, according to the present invention, two static-pressure tubes arranged respectively at the points corresponding to the outlet of the mixing chamber and to a reduction in the cross section downstream of said chamber and before the burner, said static-pressure tubes being connected to the valve for the introduction of gas.
- The mixing in the mix chamber is preferably realized counter-currently.
- This invention will be now disclosed in the following according to some preferred embodiments of the same, with particular reference to the Figures of the enclosed drawings, wherein:
- Figure 1 is a front view whose closure member is removed, of the boiler according to this invention;
- Figure 2 is a vertical transverse cross-sectional view of the boiler according to this invention; and
- Figure 3 is a top view of the Archimedean screw according to this invention.
- With reference now to all figures enclosed herein, the boiler according to this invention is realized by means of an
outer container 1 which is made up of just three parts, i.e. a die-cast aluminum casing 2, acover 3 and a lower Archimedeanscrew 4 for housing thefan 5. - The structure realized between the
casing 2 and thecover 3 provides two different sealing closures 6 and 7 (see in particular Figure 2) so as to realize two zones, respectively aninner zone 8 which is under pressure, and an outer zone 9 which is depressurized. - The
exchanger 12 and thepre-mix burner 13 are provided within theinner zone 8 on theguides 10 and 11 a slidable way. - The outflow of the smokes from the
zone 8 and the inflow of air sucked in by thefan 5 occur through thecoaxial pipe 14. - The
container 1 so realized reduces the possibility of noise from vibration to a minimum. - Moreover, the presence of a double tight seal prevents any unburnt gas leakage from the
inner zone 8 from becoming dispersed through the environment so that the unburnt gases are dispersed within the zone 9 and they come back into circulation in the depressurized part. - A
small window 15 which is made up of a transparent material is provided at the point corresponding to theburner 13, in order to observe the flame. - The outer air enters from the outer pipe of the
coaxial pipe 14 and flowing through the lateral passages of the zone 9 while it is sucked by thefan 5 arrives up to the Archimedeanscrew 4 which provides amixing chamber 16 for mixing the air with the gas. - The gas is in turn introduced into said
chamber 16 through thenozzle 17 counter-currently with respect to air in order to obtain an optimal mixing. - The gas-air mixture goes from the
mixing chamber 16 towards theburner 13 flowing through a throttledportion 18. - A
hole 19 supplied with abutterfly valve 20 is provided on the path of air, upstream of themixing chamber 16, so that air can be directly conveyed into thezone 8. Said air will flow directly above theburner 13 through thelateral holes 21 as will be disclosed in the following, without taking part in combustion. - Two static-
pressure tubes gas valve 24 are provided at the outlet of themixing chamber 16, at the point corresponding to the throttled zone, saidgas valve 24 being in turn connected to thenozzle 17. Thefan 5 is provided with amotor 25. - The
exchanger 12 is made up of two arrays ofalternate pipes inlet 28 and to theoutlet 29 of water circulating through the plant. - The fins in the smoke passage are shaped laterally in such a way as to convey the outer smokes towards the
pipes 27, and are provided below saidpipes 27 withholes 30 for discharging heat in order to prevent them from receiving an excess amount of heat. - The design selected in the realization and the arrangement of the
burner 13 and theexchanger 12 allows a very compact boiler to be realized both in the horizontal and the vertical direction, so that such boiler can be embedded into a usual hanging housing. - Turning now to the description of the operation of the boiler according to this invention, it is to be remarked that the kind of embodiment shown in the figure provides a system for modulating power.
- With the hypothesis of a boiler whose sizes are suitable for operating between a minimum power of 7,000 kcal/hr and a maximum power of 20,000 kcal/hr, the boiler, when is switched on by the user and is regulated for a water feed at 70°C, begins operating with the
valve 20 in the position that closes thehole 19 fully. - Gas and the air sucked in by the
fan 5 are mixed within thechamber 16 and then they go towards theburner 13. - The boiler in such conditions and till the value of the temperature designed is almost reached, operates at the maximum power.
- As already mentioned above, the pre-mix burners ask for a constant optimal regulation of mixing: indicatively, a gas-air mixture with a 30 % excess air amount with respect to the stoichiometric proportion.
- To that aim, the two static-
pressure tubes - Indeed, tha value of Δp which is detected by them on the basis of the change in cross-section, is proportional to the value of the fluid (gas-air) flowrate that flows, even though the value of p keeps always positive.
- Said value of Δp which is read by the
valve 24 determines the amount of gas which is introduced into themixing chamber 16. - When the value of the water temperature comes close to the value set forth by the user, there is the need for regulating the power of the boiler.
- This could also be realized by reducing the speed of the fan, so as to decrease the amount of air. Such reduction is read by the static-
pressure tubes - Such modulation system is affected however by the drawback connected to the fact that, as the sizes of the
exchanger 12 are designed for 20,000 kcal/hr, smokes would be cooled too much, so giving rise to condensation phenomena, with all accompanying problems. - Accordingly, the boiler of this invention has been so realized as to modulate its power without the occurrence of condensation.
- This is possible thanks to the
hole 19 as well as to thebutterfly valve 20 which are provided in the flow of air, upstream of themixing chamnber 16. - The
hole 19 is of such sizes that when it is fully closed bytha valve 19 the maximum power of the burner is employed, whereas when such hole is completely open, the burner is at the minimum power. - As the requirement of reducing the boiler power occurs, which reduction is decided on the basis of the water temperature, an electronic device causes through a small step-motor the
valve 20 to open. - A part of the air instead of being conveyed into the
chamber 16 is conveyed directly into thezone 8, above theburner 13 through thesmall holes 21. - Thus the value of Δp is reduced, as the air flowrate through the throttled
zone 18 is reduced, so that the gas conveyed is also reduced and the boiler power is thus reduced. - At the same time, air flowing through the
hole 19, which air is called "dilution air", dilutes the smokes so preventing them from being condensed when in contact with theexchanger 12. - It is to be observed that the dilution air does not take part in combustion in any way, so that the
burner 13 keeps its pre-mix features unaltered.
Claims (4)
- A wall-mounted gas boiler, particularly useful for domestic employment, and of the type comprising a pre-mix burner (13), a heat exchanger (12), a circuit (14,8,4) for conveying the combustion air, fan means (5) for the circulation of said air, a chamber (16) for mixing air with the gas, and an opening (19) upstream of said mixing chamber (16), in the air circulation circuit, said boiler being characterized in that said opening (19) is provided with valve means (20) and allows the dilution air to flow downstream the burner without being mixed with the gas present in the mixing chamber (16); said opening (19) being of such a size that when it is fully closed by the valve (20), the burner works at the maximum power, whereas when the opening (19) is completely open, the burner operates at the minimum power, said valve means (20) being opened or closed on the basis of the water temperature in the heat exchanger (12), means (24) being provided at the point corresponding to the mixing chamber (16) in order to change the amount of gas introduced in proportion to the flowrate of the air flowing through the same, and in that said burner is provided laterally with holes (21) that allow the passage of air that arrives from said opening (19) directly above the burner (13) itself.
- A wall-mounted gas boiler according to claim 1, characterized in that said valve means (20) are made up of a butterfly valve controlled by a step-motor.
- A wall-mounted gas boiler according to one of the preceding claims, characterized in that said means (24) for changing the amount of gas introduced into the mixing chamber comprise two static-pressure tubes arranged respectively at the point corresponding to the outlet of the mixing chamber (16) and at the point corresponding to a reduction (18) in the cross section which is realized downstream of said chamber (16), before the burner, said static-pressure tubes being connected to the gas introduction valve (26).
- A wall-mounted gas boiler according to one of the preceding claims, characterized in that the mixing within said mixing chamber (16) occurs counter-currently.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT4861090 | 1990-12-21 | ||
IT48610A IT1241559B (en) | 1990-12-21 | 1990-12-21 | WALL GAS BOILER WITH PRE-MIXING BURNER, IN PARTICULAR FOR DOMESTIC USE. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0493345A2 EP0493345A2 (en) | 1992-07-01 |
EP0493345A3 EP0493345A3 (en) | 1992-09-02 |
EP0493345B1 true EP0493345B1 (en) | 1996-01-31 |
Family
ID=11267623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91830573A Expired - Lifetime EP0493345B1 (en) | 1990-12-21 | 1991-12-18 | Wall-mounted gas boiler with premixing burner, particularly for domestic use |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0493345B1 (en) |
AT (1) | ATE133777T1 (en) |
DE (2) | DE69116842T2 (en) |
ES (1) | ES2033617T3 (en) |
IT (1) | IT1241559B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102393067A (en) * | 2011-11-16 | 2012-03-28 | 宝鸡市海浪锅炉设备有限公司 | Novel energy-saving boiler |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5171144A (en) * | 1991-09-09 | 1992-12-15 | A. O. Smith Corporation | Pressurized air seal for combustion chamber |
AT402443B (en) * | 1995-08-17 | 1997-05-26 | Vaillant Gmbh | METHOD FOR OPERATING A WATER HEATER AND DEVICE FOR IMPLEMENTING THE METHOD |
DE19711141C2 (en) * | 1997-03-18 | 1999-05-06 | Bosch Gmbh Robert | Heater with a burner powered by a fuel-air mixture |
CN111094865A (en) * | 2017-09-26 | 2020-05-01 | 株式会社能率 | Water heating device |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2320505A2 (en) * | 1973-11-12 | 1977-03-04 | Lecomte Robert | Central heating system boiler - has air passage between outer casing and combustion chamber divided by two vertical steel partitions for cooling outer casing |
NL7906458A (en) * | 1979-08-28 | 1981-03-03 | Nefit Nv | BOILER. |
NL8000460A (en) * | 1980-01-24 | 1981-08-17 | Laurentius Cornelis Johannes L | Central heating boiler combustion chamber - contg. oil or gas burner above heat exchanger for water and bottom flue outlet |
JPS5885016A (en) * | 1981-11-13 | 1983-05-21 | Matsushita Electric Ind Co Ltd | Combustion control device |
JPS58108394A (en) * | 1981-12-21 | 1983-06-28 | Hitachi Ltd | Heat exchanger |
NL8403236A (en) * | 1984-10-24 | 1986-05-16 | Henk Durieux | High efficiency central heating boiler - uses spirally wound heat exchanger around combustion chamber and around coaxial insulation block |
NL8702987A (en) * | 1987-12-10 | 1989-07-03 | Fasto Bv | HEATER. |
-
1990
- 1990-12-21 IT IT48610A patent/IT1241559B/en active IP Right Grant
-
1991
- 1991-12-18 EP EP91830573A patent/EP0493345B1/en not_active Expired - Lifetime
- 1991-12-18 DE DE69116842T patent/DE69116842T2/en not_active Expired - Fee Related
- 1991-12-18 DE DE199191830573T patent/DE493345T1/en active Pending
- 1991-12-18 AT AT91830573T patent/ATE133777T1/en not_active IP Right Cessation
- 1991-12-18 ES ES91830573T patent/ES2033617T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102393067A (en) * | 2011-11-16 | 2012-03-28 | 宝鸡市海浪锅炉设备有限公司 | Novel energy-saving boiler |
Also Published As
Publication number | Publication date |
---|---|
EP0493345A3 (en) | 1992-09-02 |
ES2033617T3 (en) | 1996-06-01 |
IT9048610A0 (en) | 1990-12-21 |
DE69116842T2 (en) | 1996-09-05 |
DE69116842D1 (en) | 1996-03-14 |
IT1241559B (en) | 1994-01-17 |
IT9048610A1 (en) | 1992-06-22 |
DE493345T1 (en) | 1992-12-17 |
ATE133777T1 (en) | 1996-02-15 |
EP0493345A2 (en) | 1992-07-01 |
ES2033617T1 (en) | 1993-04-01 |
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