EP0493345A2 - Chauffe-eau à gaz mural avec brûleur de prémélange, en particulier pour usage domestique - Google Patents

Chauffe-eau à gaz mural avec brûleur de prémélange, en particulier pour usage domestique Download PDF

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Publication number
EP0493345A2
EP0493345A2 EP91830573A EP91830573A EP0493345A2 EP 0493345 A2 EP0493345 A2 EP 0493345A2 EP 91830573 A EP91830573 A EP 91830573A EP 91830573 A EP91830573 A EP 91830573A EP 0493345 A2 EP0493345 A2 EP 0493345A2
Authority
EP
European Patent Office
Prior art keywords
air
chamber
burner
wall
mixing
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.)
Granted
Application number
EP91830573A
Other languages
German (de)
English (en)
Other versions
EP0493345A3 (en
EP0493345B1 (fr
Inventor
Marcello C/O Merloni Termosanitari Venanzoni
Flavio C/O Merloni Termosanitari Chiavetti
Alberto C/O Merloni Termosanitari Marconi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Merloni Termosanitari SpA
Original Assignee
Merloni Termosanitari SpA
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Filing date
Publication date
Application filed by Merloni Termosanitari SpA filed Critical Merloni Termosanitari SpA
Publication of EP0493345A2 publication Critical patent/EP0493345A2/fr
Publication of EP0493345A3 publication Critical patent/EP0493345A3/en
Application granted granted Critical
Publication of EP0493345B1 publication Critical patent/EP0493345B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 + N0 2 , 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.
  • 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.
  • a wall-mounted gas boiler in particular for domestic use, of the type comprising a pre-mix burner, a heat exchanger, a circuit for the introduction of the combustion air, means for causing said air to circulate, a chamber for mixing air and gas, wherein an opening which can be closed by valve- means is also provided, upstream of said mixing chamber in the circuit for the circulation of air, said opening allowing the dilution air to flow downstream of the burner, said air being so prevented from mixing with the gas; said opening being of so sizes as to allow the burner to operate at the maximum power when the opening is completely closed, and to allow said burner to operate at the minimum power when said opening is completely open, said valve means becoming opened or closed on the basis of the temperature of water contained within the heat exchanger, means being provided at the point corresponding to said mixing chamber for changing the amount of gas introduced in proportion to the air flowrate passing through the same.
  • a boiler of the type mentioned above having the features mentioned above, said boiler comprising an integral container having a pressurized inner chamber, the burner and the heat exchanger being arranged within said pressurized chamber, and an outer depressurized chamber through which the air sucked by the fan flows, the outflow of the inner chamber smokes and the inflow of air into the outer chamber occuring through an upper coaxial pipe; a closure member of the container, said member being provided with a double seal in order to tightly seal the inner chamber as well as the outer chamber; and a lower Archimedean screw, which houses the fan, said screw being connected with the outer chamber, and in which screw the chamber is provided for mixing gas with air, while said chamber is in turn provided with means for changing the amount of gas introduced in proportion to the flowrate of the air flowing through the same.
  • said burner is provided laterally with holes that allow air to flow through 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 heat exchanger is realized with a pipe coil arranged along a double array, the pipes being staggered, said heat exchanger being preferably provided with holes for the introduction of air at the points corresponding to the upper pipes.
  • said container which is made up of an integral piece provides in the inner chamber some guides for inserting the burner and the exchanger in a slidable way.
  • 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 8 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 Ap 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 Ap 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)
EP91830573A 1990-12-21 1991-12-18 Chauffe-eau à gaz mural avec brûleur de prémélange, en particulier pour usage domestique Expired - Lifetime EP0493345B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4861090 1990-12-21
IT48610A IT1241559B (it) 1990-12-21 1990-12-21 Caldaia murale a gas con bruciatore a premiscelazione, in particolare per uso domestico.

Publications (3)

Publication Number Publication Date
EP0493345A2 true EP0493345A2 (fr) 1992-07-01
EP0493345A3 EP0493345A3 (en) 1992-09-02
EP0493345B1 EP0493345B1 (fr) 1996-01-31

Family

ID=11267623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91830573A Expired - Lifetime EP0493345B1 (fr) 1990-12-21 1991-12-18 Chauffe-eau à gaz mural avec brûleur de prémélange, en particulier pour usage domestique

Country Status (5)

Country Link
EP (1) EP0493345B1 (fr)
AT (1) ATE133777T1 (fr)
DE (2) DE493345T1 (fr)
ES (1) ES2033617T3 (fr)
IT (1) IT1241559B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532165A2 (fr) * 1991-09-09 1993-03-17 Aos Holding Company Dispositif d'étanchéité à l'air sous pression pour chambre de combustion
DE19711141A1 (de) * 1997-03-18 1998-09-24 Bosch Gmbh Robert Heizgerät mit einem durch ein Brennstoff-Luftgemisch gespeisten Brenner
DE19633880B4 (de) * 1995-08-17 2008-02-28 Vaillant Gmbh Verfahren zum Betrieb eines Wasserheizers
US11512871B2 (en) * 2017-09-26 2022-11-29 Noritz Corporation Water heater

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102393067B (zh) * 2011-11-16 2013-06-12 宝鸡市海浪锅炉设备有限公司 新型节能锅炉

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2320505A2 (fr) * 1973-11-12 1977-03-04 Lecomte Robert Centrale de chauffe compacte
FR2464437A1 (fr) * 1979-08-28 1981-03-06 Nefit Nv Chaudiere dont le bruleur est forme par une paroi de la chambre de melange
NL8000460A (nl) * 1980-01-24 1981-08-17 Laurentius Cornelis Johannes L Verwarmingsinrichting.
JPS5885016A (ja) * 1981-11-13 1983-05-21 Matsushita Electric Ind Co Ltd 燃焼制御装置
JPS58108394A (ja) * 1981-12-21 1983-06-28 Hitachi Ltd 熱交換器
NL8403236A (nl) * 1984-10-24 1986-05-16 Henk Durieux Verwarmingsketel voor een centrale verwarmingsinstallatie.
EP0320072A2 (fr) * 1987-12-10 1989-06-14 Fasto B.V. Réchauffeur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2320505A2 (fr) * 1973-11-12 1977-03-04 Lecomte Robert Centrale de chauffe compacte
FR2464437A1 (fr) * 1979-08-28 1981-03-06 Nefit Nv Chaudiere dont le bruleur est forme par une paroi de la chambre de melange
NL8000460A (nl) * 1980-01-24 1981-08-17 Laurentius Cornelis Johannes L Verwarmingsinrichting.
JPS5885016A (ja) * 1981-11-13 1983-05-21 Matsushita Electric Ind Co Ltd 燃焼制御装置
JPS58108394A (ja) * 1981-12-21 1983-06-28 Hitachi Ltd 熱交換器
NL8403236A (nl) * 1984-10-24 1986-05-16 Henk Durieux Verwarmingsketel voor een centrale verwarmingsinstallatie.
EP0320072A2 (fr) * 1987-12-10 1989-06-14 Fasto B.V. Réchauffeur

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 183(M-235), 12th August 1983; & JP-A-58 085 016 (MATSUSHITA DENKI SANGYO K.K.) 21-05-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 215 (M-244)(1360), 22nd September 1983; & JP-A-58 108 394 (HITACHI SEISAKUSHO K.K.) 28-06-1983 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532165A2 (fr) * 1991-09-09 1993-03-17 Aos Holding Company Dispositif d'étanchéité à l'air sous pression pour chambre de combustion
EP0532165A3 (en) * 1991-09-09 1993-07-14 Aos Holding Company Pressurized air seal for combustion chamber
DE19633880B4 (de) * 1995-08-17 2008-02-28 Vaillant Gmbh Verfahren zum Betrieb eines Wasserheizers
DE19711141A1 (de) * 1997-03-18 1998-09-24 Bosch Gmbh Robert Heizgerät mit einem durch ein Brennstoff-Luftgemisch gespeisten Brenner
DE19711141C2 (de) * 1997-03-18 1999-05-06 Bosch Gmbh Robert Heizgerät mit einem durch ein Brennstoff-Luftgemisch gespeisten Brenner
US11512871B2 (en) * 2017-09-26 2022-11-29 Noritz Corporation Water heater

Also Published As

Publication number Publication date
IT1241559B (it) 1994-01-17
ES2033617T1 (es) 1993-04-01
EP0493345A3 (en) 1992-09-02
DE69116842T2 (de) 1996-09-05
DE69116842D1 (de) 1996-03-14
DE493345T1 (de) 1992-12-17
IT9048610A1 (it) 1992-06-22
EP0493345B1 (fr) 1996-01-31
ATE133777T1 (de) 1996-02-15
IT9048610A0 (it) 1990-12-21
ES2033617T3 (es) 1996-06-01

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