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EP 1 180 642 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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26.10.2005 Bulletin 2005/43 |
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Date of filing: 01.08.2001 |
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International Patent Classification (IPC)7: F23D 14/06 |
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Ultra-high-speed burner for a cooking range or a gas cooker
Hochgeschwindigkeitsbrenner für eine Kochstelle
Brûleur à haute vitesse pour réchaud
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Designated Contracting States: |
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DE ES FR GB IT SE |
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Priority: |
02.08.2000 IT TO000773
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Date of publication of application: |
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20.02.2002 Bulletin 2002/08 |
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Proprietor: SMEG S.p.A. |
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I-42016 Guastalla (IT) |
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Inventor: |
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- Dallaglio, Carmelo
42024 Castelnovo di Sotto (IT)
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Representative: Franzolin, Luigi et al |
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STUDIO TORTA S.r.l.,
Via Viotti, 9 10121 Torino 10121 Torino (IT) |
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References cited: :
EP-A- 0 552 135 US-A- 5 401 164 US-A- 5 842 849
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FR-A- 2 507 743 US-A- 5 704 778
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to an ultra-high-speed burner for a cooking range or
gas cooker.
[0002] A cooking range or gas cooker comprises a number of burners, which differ in size,
sometimes in shape, and in maximum power to meet different cooking requirements. One
of these is the fast heating of large cooking vessels, e.g. to boil a large volume
of water, which calls for high-power, so-called ultra-high-speed burners capable of
supplying at least 3.5 kW.
[0003] Known ultra-high-speed burners comprise burners with one, two or three jet rings,
known as single-, two- or three-ring ultra-high-speed burners respectively. Single-ring
ultra-high-speed burners have one large-diameter, high-power ring, but have the drawback
of failing to provide for uniform heating.
[0004] By way of a solution to the problem, currently marketed ultra-high-speed burners
are two-ring types comprising two concentric jet rings, each with respective power
jet holes, i.e. for the jets providing the heating power. Two- and three-ring ultra-high-speed
burners provide for uniform heating and high power, but have various drawbacks : a
large number of component parts to dismantle when cleaning or servicing the range;
unsightly appearance; unbalanced supply of the gaseous mixture to the two rings; and
flow of the secondary air to the inner rings is hindered by the outer ring. An example
of ultra high-speed burner is disclosed in US 5,704,778. The burner described in there
has the additional drawback of not being suitable for detecting whether one of the
channel debouching in the outer ring is clogged. In order to overcome this drawback,
the ultra high-speed burner disclosed in 5,842,849 comprises an outer ring made of
separate chambers, each channel debouching in a adjacent chamber only. This solution
allows the detection of clogged channels but increases the number of components.
[0005] It is an object of the present invention to provide a high-power burner designed
to eliminate the drawbacks typically associated with the known state of the art.
[0006] According to the present invention, there is provided an ultra-high-speed burner
in accordance with claim 1.
[0007] A non-limiting embodiment of the present invention will be described by way of example
with reference to the accompanying drawings, in which:
Figure 1 shows an exploded view, with parts removed for clarity, of an ultra-high-speed
burner in accordance with the present invention;
Figure 2 shows a plan view of the Figure 1 burner;
Figure 3 shows a section of the Figure 2 burner along line III-III;
Figure 4 shows a view in perspective of a detail of the Figure 2 burner;
Figure 5 shows a plan view of a variation of the Figure 1-4 burner.
[0008] With reference to Figures 1, 2 and 3, number 1 indicates as a whole a gas burner
for a cooking range comprising a wall P, only shown in Figure 3.
[0009] Burner 1 comprises a support 2 fixed to wall P, a plate 3 on top of support 2 and
wall P, a jet ring 4, and a cap 5, which are placed in that order one on top of the
other along an axis A. Burner 1 is supplied by a mains-pressure gas pipe 6 fitted
with two nozzles 7 (only one shown in Figures 1 and 2), and comprises two air-gas
mixture supply conduits 8 and 9 located beneath wall P, connected to support 2, and
comprising respective venturi tubes 10. Support 2 comprises a plate 11 fitted with
a gas detector 12 and a piezoelectric device 13 for lighting the mixture; a central
hole 14 coaxial with axis A and connected to conduit 8; and an opening 15 which, viewed
from above, is sector-shaped, extends about hole 14, and is connected to conduit 9.
[0010] With reference to Figure 1, plate 3 is disk-shaped and comprises a central through
sleeve 16; and two bean-shaped lateral openings 17 located on opposite sides of sleeve
16 and communicating, in use, with opening 15. To align openings 17 and opening 15,
plate 3 and support 2 comprise respective locating elements (not shown) to position
plate 3 on support 2 with a given orientation. Plate 3 comprises a bottom wall 18;
a lateral wall 19; and two looped, bean-shaped partitions 20, which, together with
bottom wall 18, lateral wall 19 and jet ring 4, define an annular chamber 21 and two
passages 22 connecting openings 17 and annular chamber 21.
[0011] With reference to Figures 1 to 4, jet ring 4 is disk-shaped and comprises a dome
23 with a central through sleeve 24; a ring 25 having a projection 26; and a substantially
cylindrical lateral wall 27, which mates with lateral wall 19 of plate 3 and has a
succession of outlet holes 28 for supplying auxiliary jets. Ring 25 is truncated-cone-shaped
and has a succession of holes 29 for supplying first power jets and located along
a circumference C1; and a succession of holes 30 for supplying second power jets and
located along a circumference C2 larger in diameter than and located beneath circumference
C1. Holes 30 are smaller in diameter than and offset angularly with respect to holes
29. The edge of dome 23 has two sets 31 of holes 32 for supplying the mixture to annular
chamber 21; sets 31 are located on opposite sides of sleeve 24 and passages 22, so
as to correspond with respective partitions 20; and ring 4 and plate 3 have respective
locating elements for so positioning ring 4 on plate 3 that supply holes 32 are offset
with respect to openings 17 on plate 3. In other words, annular chamber 21 is ideally
divided into two sectors 33 and two sectors 34, as shown by the dash lines in Figure
2, wherein sectors 34 communicate directly with respective passages 22, and each sector
33 communicates directly with a respective set 31 of supply holes 32. Given the location
of holes 32 with respect to passages 22, sectors 33 and 34 alternate along the annular
chamber. The division into sectors 33 and 34 is only determined during operation of
burner 1, and depends on distribution of the fuel gas. Ring 4 comprises two partitions
35, which, viewed from above, are substantially the same shape and size as partitions
20, are located at respective sets 31 of holes 32, and rest on top of partitions 20.
Passages 22 are defined by bottom wall 18 and partitions 20 of plate 3, and by the
dome and partitions 35 of jet ring 4.
[0012] Cap 5 is dome-shaped and fits onto projection 26 of ring 4 to form a chamber 36,
which is located on top of ring 4 and communicates with annular chamber 21 via holes
32, and with conduit 9 via sleeve 24.
[0013] In other words, burner 1 comprises two channels 37 and 38 for supplying chamber 21
and for separately supplying sectors 33 and 34 of chamber 21 respectively. Channel
37 is defined by conduit 8, hole 14 in support 2, sleeve 16 on plate 3, sleeve 24
on ring 4, chamber 36, and sets 31 of holes 32.
[0014] Channel 38 is defined, along a first portion, by conduit 9 and opening 15 on support
2, and, along a second portion, by openings 17 and passages 22. In other words, channel
38 is divided into two portions to supply the two opposite sectors 34.
[0015] In actual use, gas is supplied at mains pressure along pipe 6 and is regulated by
a known tap not shown. The pressurized gas is injected by nozzles 7 into respective
venturi tubes 10, and flows into respective conduits 8 and 9 together with air fed
dynamically into conduits 8 and 9. That is, two separate streams of air-gas mixture
flow along channels 37 and 38 in the direction indicated by arrows F to supply respective
sectors 33 and 34 of annular chamber 21 separately. The separation of sectors 33 from
sectors 34 is purely an ideal one, there being no partitions for actually dividing
chamber 21 into different parts, and is due to the dynamic performance of the air-gas
mixture determined by the location of holes 32 with respect to passages 22, i.e. by
the relative position of the end portions of channels 37 and 38. The air-gas mixture
flows out of each sector 33 and 34 of annular chamber 21 through holes 29 and 30 for
supplying the first and second power jets, and through holes 28 for supplying the
auxiliary jets.
[0016] In the Figure 5 variation, the annular chamber 21 is divided into two complementary
sectors 39 and 40 by two partitions 41 connected to the partition 20 on the same side
as piezoelectric lighting device 13; jet ring 4 comprises one set 31 of holes 32 for
supplying sector 39; and sector 40 is supplied entirely through openings 17 and passages
22.
[0017] The variation described provides for detecting any interruption in supply of the
air-gas mixture along both channel 37 and channel 38. Any interruption in supply of
the air-gas mixture along channel 37, in fact, would prevent the entire burner 1 from
lighting, by the air-gas mixture not being supplied to piezoelectric lighting device
13; while any interruption in supply of the mixture along channel 38 would only light
the sector 39 jets.
[0018] In a variation not shown, as opposed to pipe 6, burner 1 is supplied by two separate
pipes controlled by one tap for supplying channels 37 and 38 simultaneously or separately.
[0019] The burners described afford numerous advantages. In particular, they comprise a
small number of component parts, and provide for concentrating considerable power
in one relatively small-diameter jet ring.
1. An ultra-high-speed burner for a cooking range or gas cooker, wherein the burner comprises
a plate (3); a jet ring (4) having a ring (25) along which power jet supply holes
(29, 30) are distributed; an annular chamber (21) defined by the plate (3) and the
jet ring (4); a first and a second channel (37, 38) for feeding fuel gas to said annular
chamber (21); said first and said second channel (37, 38) debouching inside respective
sectors (33, 34; 39, 40) of said annular chamber (21); said sectors (33, 34; 39, 40)
comprising at least a first sector (33; 39) communicating with said first channel
(37); and at least a second sector (39; 40) communicating with the second channel
(38); the burner being characterized in that said first sector (33; 34) and said second sector (39; 40) being complementary to
each other and separated by two partitions (41) located in the annular chamber (21).
2. A Burner as claimed in Claim 1, characterized in that said power jet supply holes (29, 30) comprise a succession of first power jet supply
holes (29) and a succession of second power jet supply holes (30).
3. A burner as claimed in Claim 2, characterized in that said first power jet supply holes (29) are arranged on said ring (25) along a first
circumference (C1); and said second power jet supply holes (30) are arranged on said
ring (25) along a second circumference (C2).
4. A burner as claimed in Claim 3, characterized in that said first power jet supply holes (29) are larger in diameter than the second power
jet supply holes (30).
5. A burner as claimed in Claim 3 or 4, characterized in that the first power jet supply holes (29) are offset angularly with respect to the second
power jet supply holes (30).
6. A burner as claimed in Claim 1, characterized by comprising a lighting device (13) adjacent to the first sector (33; 39).
7. A burner as claimed in one of the foregoing Claims, characterized by comprising a cap (5) resting on said jet ring (4) to define a chamber (36) between
the jet ring (4) and the cap (5); said chamber (36) communicating directly with the
annular chamber (21) by means of holes (32); and the first channel (37) being defined
partly by the chamber (36) and by said holes (32).
8. A burner as claimed in Claim 7, characterized in that the first channel (37) is defined partly by a first conduit (8), by a hole (14) in
a support (2), and by a first and a second sleeve (16, 24) of said plate (3) and said
jet ring (4) respectively; said second sleeve (24) communicating directly with said
chamber (36).
9. A burner as claimed in Claim 8, characterized in that said second channel (38) is defined partly by a second conduit (9), by a first opening
(15) formed in said support (2), and by second openings (17) formed in said plate
(3); said plate (3) being so positioned with respect to said support (2) that said
second openings (17) correspond with the first opening (15).
10. A burner as claimed in Claim 9, characterized in that said second channel (38) is defined partly by two passages (22) extending on opposite
sides of said first sleeve (16).
11. A burner as claimed in Claim 10, characterized in that said plate (3) and said jet ring (4) comprise respective first and second partitions
(20, 35) defining said passages (22).
12. A burner as claimed in Claims 8 and 9, characterized in that the first and second conduit (8, 9) comprise respective venturi tubes (10).
1. Ein Ultrahochgeschwindigkeitsbrenner für einen Kochbereich oder Gaskocher, wobei der
Brenner eine Platte (3); einen Düsenring (4) mit einem Ring (25), entlang dem Energiedüsenzufuhrlöcher
(29, 30) verteilt sind; eine ringförmige Kammer (21), die durch die Platte (3) und
den Düsenring (4) definiert ist; einen ersten und einen zweiten Kanal (37, 38), um
Brenngas der ringförmigen Kammer (21) zuzuführen, umfasst; wobei der erste und der
zweite Kanal (37, 38) innerhalb entsprechender Sektoren (33, 34; 39, 40) der ringförmigen
Kammer (21) einmünden; wobei die Sektoren (33, 34; 39, 40) wenigstens einen ersten
Sektor (33; 39), der mit dem ersten Kanal (37) in Verbindung steht, und wenigstens
einen zweiten Sektor (39; 40) umfassen, der mit dem zweiten Kanal (38) in Verbindung
steht; wobei der Brenner dadurch gekennzeichnet ist, dass der erste Sektor (33; 34) und der zweite Sektor (39; 40) komplementär zueinander
sind und durch zwei Raumteiler (41), die in der ringförmigen Kammer (21) angeordnet
sind, getrennt sind.
2. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass die Energiedüsenzufuhrlöcher (29, 30) eine Folge erster Energiedüsenzufuhrlöcher
(29) und eine Folge zweiter Energiedüsenzufuhrlöcher (30) umfassen.
3. Brenner nach Anspruch 2, dadurch gekennzeichnet, dass die ersten Energiedüsenzufuhrlöcher (29) an dem Ring (25) entlang eines ersten Umfangs
(C1) angeordnet sind; und die zweiten Energiedüsenzufuhrlöcher (30) an dem Ring (25)
entlang eines zweiten Umfangs (C2) angeordnet sind.
4. Brenner nach Anspruch 3, dadurch gekennzeichnet, dass die ersten Energiedüsenzufuhrlöcher (29) im Durchmesser größer als die zweiten Energiedüsenzufuhrlöcher
(30) sind.
5. Brenner nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die ersten Energiedüsenzufuhrlöcher (29) hinsichtlich des Winkels bezüglich der zweiten
Energiedüsenzufuhrlöcher (30) versetzt sind.
6. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass er benachbart zu dem ersten Sektor (33; 39) eine Zündvorrichtung (13) umfasst.
7. Brenner nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass er eine Kappe (5) umfasst, die auf dem Düsenring (4) ruht, um eine Kammer (36) zwischen
dem Düsenring (4) und der Kappe (5) zu definieren; wobei die Kammer (36) mit der ringförmigen
Kammer (21) mittels Löchern (32) unmittelbar in Verbindung steht; und wobei der erste
Kanal (37) teilweise durch die Kammer (36) und durch die Löcher (32) definiert ist.
8. Brenner nach Anspruch 7, dadurch gekennzeichnet, dass der erste Kanal (37) teilweise durch eine erste Rohrleitung (8), durch ein Loch (14)
in einer Halterung (2) und durch eine erste und eine zweite Hülse (16, 24) der Platte
(3) bzw. des Düsenrings (4) definiert ist; wobei die zweite Hülse (24) mit der Kammer
(36) unmittelbar in Verbindung steht.
9. Brenner nach Anspruch 8, dadurch gekennzeichnet, dass der zweite Kanal (38) teilweise durch eine zweite Rohrleitung (9), durch eine erste,
in der Halterung (2) ausgebildete Öffnung (15) und durch zweite, in der Platte (3)
ausgebildete Öffnungen (17) definiert ist; wobei die Platte (3) relativ zu der Halterung
(2) so positioniert ist, dass die zweiten Öffnungen (17) der ersten Öffnung (15) entsprechen.
10. Brenner nach Anspruch 9, dadurch gekennzeichnet, dass der zweite Kanal (38) teilweise durch zwei Durchlässe (22) definiert ist, die sich
auf gegenüberliegenden Seiten der ersten Hülse (16) erstrecken.
11. Brenner nach Anspruch 10, dadurch gekennzeichnet, dass die Platte (3) und der Düsenring (4) entsprechende erste und zweite Raumteiler (20,
35) umfassen, die die Durchlässe (22) definieren.
12. Brenner nach Anspruch 8 und 9, dadurch gekennzeichnet, dass die erste und die zweite Rohrleitung (8, 9) entsprechende Venturi-Düsen (10) umfassen.
1. Brûleur fonctionnant à très grande vitesse pour une installation de cuisson ou pour
une cuisinière à gaz, dans lequel le brûleur comprend une plaque (3); un anneau (4)
de production de jets comportant un anneau (25) le long duquel sont répartis des trous
(29, 30) de délivrance de jets de puissance; une chambre annulaire (21) définie par
la plaque (3) et l'anneau (4) de production de jets; des premiers et seconds canaux
(37, 38) pour amener du gaz combustible à ladite chambre annulaire (21); lesdits premiers
et seconds canaux (37, 38) débouchant à l'intérieur de secteurs respectifs (33, 34;
39, 40) de ladite chambre annulaire (21); lesdits secteurs (33, 34; 39, 40) comprenant
au moins un premier secteur (33; 39) communiquant avec ledit premier canal (37) et
au moins un second secteur (39; 40) communiquant avec le second canal (38); le brûleur
étant caractérisé en ce que ledit premier secteur (33; 34) et ledit second secteur (39 ; 40) sont complémentaires
l'un de l'autre et sont séparés par deux cloisons de séparation (41) situées dans
la chambre annulaire (21).
2. Brûleur selon la revendication 1, caractérisé en ce que lesdits trous (29, 30) de délivrance de jets de puissance comprennent une succession
de premiers trous (29) de délivrance de jets de puissance et une succession de seconds
trous (30) de délivrance de jets de puissance.
3. Brûleur selon la revendication 2, caractérisé en ce que lesdits premiers trous (29) de délivrance de jets de puissance sont disposés sur
ledit anneau (25) le long d'une première circonférence (C1); et lesdits seconds trous
(30) de délivrance de jets de puissance sont disposés sur ledit anneau (25) le long
d'une seconde circonférence (C2).
4. Brûleur selon la revendication 3, caractérisé en ce que lesdits premiers trous (29) de délivrance de jets de puissance ont un diamètre supérieur
à celui des seconds trous (30) de délivrance de jets de puissance.
5. Brûleur selon la revendication 3 ou 4, caractérisé en ce que les premiers trous (29) de délivrance de jets de puissance sont décalés angulairement
par rapport aux seconds trous (30) de délivrance de jets de puissance.
6. Brûleur selon la revendication 1, caractérisé en ce qu'il comporte un dispositif d'allumage (13) au voisinage du premier secteur (33; 39).
7. Brûleur selon l'une des revendications précédentes, caractérisé en ce qu'il comprend un capot (5) en appui sur ledit anneau (4) de production de jets pour
définir une chambre (36) entre l'anneau (4) de production de jets et le capot (5);
ladite chambre (36) communiquant directement avec la chambre annulaire (21) à l'aide
de trous (32), et le premier canal (37) étant défini en partie par la chambre (36)
et lesdits trous (32).
8. Brûleur selon la revendication 7, caractérisé en ce que le premier canal (37) est défini en partie par un premier conduit (8), par un trou
(14) formé dans un support (2) et par des premier et second manchons (16, 24) de ladite
plaque (3) et dudit anneau (4) de production de jets respectivement; ledit second
manchon (24) communiquant directement avec ladite chambre (36).
9. Brûleur selon la revendication 8, caractérisé en ce que ledit second canal (38) est défini en partie par un second conduit (9), par une première
ouverture (15) formée dans ledit support (2) et par des secondes ouvertures (17) formées
dans ladite plaque (3); ladite plaque (3) étant positionnée par rapport audit support
(2) de telle sorte que lesdites secondes ouvertures (17) correspondent à la première
ouverture (15).
10. Brûleur selon la revendication 9, caractérisé en ce que ledit second canal (38) est défini partiellement par deux passages (22) qui s'étendent
sur les côtés opposés dudit premier manchon (16).
11. Brûleur selon la revendication 10, caractérisé en ce que ladite plaque (3) et ledit anneau (4) de production de jets comprennent des première
et seconde cloisons de séparation respectives (20, 35) définissant lesdits passages
(22).
12. Brûleur selon les revendications 8 et 9, caractérisé en ce que les premier et second conduits (19) comprennent des tubes à venturi respectifs (10).