EP0651203B1 - Brûleur radiant à gaz pour cuisinière ou table de cuisson - Google Patents
Brûleur radiant à gaz pour cuisinière ou table de cuisson Download PDFInfo
- Publication number
- EP0651203B1 EP0651203B1 EP94402191A EP94402191A EP0651203B1 EP 0651203 B1 EP0651203 B1 EP 0651203B1 EP 94402191 A EP94402191 A EP 94402191A EP 94402191 A EP94402191 A EP 94402191A EP 0651203 B1 EP0651203 B1 EP 0651203B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixing chamber
- air
- bell
- gas
- burner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/78—Cooling burner parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/16—Radiant burners using permeable blocks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
- F24C3/06—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame
- F24C3/067—Ranges
Definitions
- the present invention relates to burners with radiant gas, for stoves or tables cooking.
- Such a burner conventionally comprises a head having a porous radiant element, the face of which front defines the combustion face of the burner. Under this radiant element is arranged a chamber in which air and gas mix before reaching said element.
- Such a radiant type gas burner is by example used to make cooktops of a appearance close to that of tables with ceramic glass hob, the front frontal of the radiant element flush with the plane top of the table in which said burner is integrated.
- One such hob has been described in the international patent application of the Applicant published under number WO-92/06334.
- Radiant type gas burners known to this day have the following major drawback: the containers to be heated being very close to the faces of combustion of radiant elements (the space between a container and a radiant element to allow the evacuation of combustion gases is only a few millimeters), it occurs by convection and conduction significant heat transfers to the volumes which are located under the radiant elements.
- a main object of the invention is to solve this problem.
- the cooling achieved is only a side effect of the form and deflector geometry whose main function is distribute the air / gas mixture appropriately in relation to the radiant element. This cooling is insufficient to effectively oppose room warming mixture.
- the invention proposes a burner which is characterized in that the obstacle element has a general exterior outline which is analogous to inner contour of the mixing chamber and which defines with this one a circulation blade in which the air / gas mixture is forced to circulate before reaching the radiant element, to convectively exchange with the or the side walls of the mixing chamber.
- the obstacle-forming element is a bell, this bell having a bottom surrounded by walls lateral extending from said bottom to a bottom of the mixing chamber on which said bell is carried, the interior of this bell being supplied with air and gas, the mixture formed in said bell discharging from this in the vicinity of the bottom of the mixing chamber, then going up to the radiant element by circulating in the circulation space defined between the wall (s) sides of the bell and the mixing chamber.
- Such a structure makes it possible to mix satisfying air and gas before they reach the radiant element of the burner: the air / gas mixture injected in the bell is homogenized there before evacuating at neighborhood of the bottom of the bell to participate actively cooling the walls of the mixing chamber.
- the burner in Figure 1 is a gas burner from radiant type integrated in a T hob. consisting of a combustion head 1 and a body 2 which wear this head 1.
- the combustion head 1 has a skirt 3 cylindrical tubular by which it is supported the body 2. This head 1 is closed at its end opposite the body 2 by a porous membrane 4, which constitutes the radiant element of the burner.
- This membrane 4 is made of a metallic fiber material sintered refractories.
- This material is advantageously of the type which is sold by the company ACOTECH under the name BEKITHERM® AC 200 P1 and which has the particularity of being traversed by a multitude of perforations of diameter less than the distance of jamming of the flames. These perforations make it possible to considerably reduce the pressure drops that this material imposes on the gas mixture. This material also has excellent Nox performance: 40 ppm at 500 kW / m 2 and 10% excess air.
- the front face of the radiant element 4 constitutes the combustion face of the burner. It is flush with compared to the upper face of table T.
- the skirt 3 is surrounded externally, towards its end which carries the radiant element 4, by a annular collar 5.
- This collar 5 is itself annularly bordered by a flat 6. This comes in support on the edge of the opening of the table T, which receives said burner 1, in order to maintain the combustion head 1 compared to table T.
- Body 2 is mainly constituted by a cylindrical wall 7 closed by a bottom 8.
- This cylindrical wall 7 is substantially the same inner and outer diameters than the skirt 3.
- the edge of the skirt 3 bears on that of the edges of the wall 7, which is opposite to the bottom 8.
- This section referenced by 7a in FIG. 1, is extended by a collar 9 ensuring the centering of the skirt 3 relative to the wall 7.
- An annular seal 10 for sealing and catch-up is provided to come between the skirt 3 and the wall 7. This seal 10 is received in a housing U-shaped annular section with the edge 7a near the inner face of the wall 7.
- the skirt 3 and the wall 7 define, with the membrane 4 and bottom 8, a chamber 11 in which air and gas mix before reaching said membrane 4.
- this chamber 11 is arranged an element 12 forming a bell, which is supported by its edge on the bottom 8.
- This bell-shaped element 12 is defined by a cylindrical body 14 closed by a bottom 13.
- the diameter outside of body 14 is slightly less than the diameter inside of chamber 11. Its axial height is significantly smaller than the height of the chamber 11, so that the bottom 13 is spaced from the membrane 4.
- This element 12 forming a bell is extended by several legs 15 which project radially with respect to the external face of the body 14. These legs 15 are distributed over the entire periphery of said body 14 and ensure the centering of said element 12 in the mixing chamber 11.
- the edge of the element 12 forming a bell has also, between the legs 15, shaped recesses 16 of slots which are regularly distributed throughout its around. These recesses 16 ensure communication between the internal volume of the bell 12 and the blade circulation which is defined between the outer faces of the bell 12 and the interior faces of the chamber 11.
- the bell 12 and the wall 7 are further crossed radially by a channel 17 which opens into said bell 12 and which supplies the chamber 11 in air and gas, the air and the gas being propelled into said channel by means of ventilation arranged upstream of the mixing chamber. So that the bell can be removed from the bottom 8, the recess of the bell 12 in which the channel 17 is past is a notch 17a formed on the edge of said bell 12.
- the bottom 8 is crossed by an orifice 8a from from which a tubular element 18 extends coaxially in chamber 11, up to the radiant element 4.
- a tubular element 18 extends coaxially in chamber 11, up to the radiant element 4.
- an electrode 19 which opens out of said tubular element 18 at its end opposite the bottom 8. This electrode 19 is thus partially projecting relative to the front face of the radiant element 4.
- tubular element 18 is embedded in a ring 20 of ceramic material which thermally insulates the membrane 4.
- a tubular cylindrical stopper 21 extends to from this ring 20, towards the bottom 8, surrounding the tubular element 18.
- This stopper 21 is of a length shorter than the length of element 18. It ends in its end opposite to the ring 20 by a flange outer annular 22. Between this flange 22 and the bottom 8 is compressed a helical spring 23 also passed over the tubular element 18.
- Locking means (not shown) keep the combustion head 1 in place on the body 2, while the spring 23 is compressed.
- These locking means are for example means electromagnetic.
- Body 2 and channel 17 are previously integrated into the table T, during assembly thereof.
- the operator passes the spring 23 and the stopper 21 on the tubular element 18. Then, he introduces the bell 12 in chamber 11, positioning the notch 17a on channel 17. He then covers the whole by the head combustion 1, the ring 20 of which bears on the stopper 21 and exerts on said head 1 an effort to compress, via the collar 22, the spring 23. When the skirt 3 is in place on the edge from wall 7, the operator locks the head combustion 1 on the body 2.
- the bell 12 defines with the side face cylindrical mixing chamber a blade of circulation, in which the air / gas mixture is forced to circulate while being in contact with said lateral face over most of its height.
- the walls which define said chamber 11 are thus cooled by the air / gas mixture, while this is preheated, which improves the efficiency of the burner.
- the air / gas mixture does not reach its auto-ignition temperature (from around 500 ° C for LPG gases; around 800 ° C for natural gas).
- Spring 23 is subtracted from the high temperatures, since it is arranged inside the distribution bell 12 and that it doesn't push the membrane 4 directly, but via the stopper 21.
- the circulation of the air / gas mixture also allows the cooling of the seal 10 which is arranged nearby inner faces of the skirt 3 and of the cylinder 7, and benefits from the temperature gradient in this wall. This cooling is all the better as this joint seal 10 is located just above the channel supply 17, so that it is cooled by a "fresh" gas mixture, directly from bell 12 distribution.
- the central position of the electrode 19 presents the advantage of being favorable to ignition. It is indeed the center of the porous membrane 4 which is the least disturbed by the movement of ambient air. It's also at the center level, that natural convection with the ambient air is the weakest.
- the perforations in the membrane 4 allow increase the range of operating powers of the burner. Also, the ventilation means working with less back pressure, they rotate more slowly and are therefore less noisy.
- the disassembly of the head 1 can intervene without the user do not have to handle the electrode 19 and the high connections voltage to which it is connected, since the head of combustion slides in relation to the tubular element 18 and electrode 19.
- the burner has a head 101 and a body 102 which together define a chamber 111.
- the head 101 has a radiant element 104.
- Chamber 111 is supplied with air and gas by a channel 117.
- an element 112 which forms a obstacle for the circulation of the air / gas and force mixture the air / gas mixture to circulate along the faces inside the mixing chamber, before combustion.
- the element 112 forming an obstacle is a solid element which is of an external geometry complementary to the interior geometry of the mixing chamber 111.
- the blade of circulation thus defined obliges the air / gas mixture to circulate in contact with the walls of room 111 and at thus participate in the cooling thereof.
- the element 112 forming obstacle and the mixing chamber 111 are shaped parallelepiped.
- the element 112 and the chamber 111 are substantially conical in shape and widens towards the element radiant from the burner head.
- the bell shape of the obstacle which corresponds in particular to the embodiments represented on the Figure 1 and Figures 2c to 2d, nevertheless constitutes a preferred solution for the invention, since the air / gas mixture injected into the bell is homogenized there, before being evacuated by recesses provided for this purpose in the vicinity of the edge of the bell 112, in actively participating in cooling the walls of the mixing chamber.
- the mixing chamber 111 can be supplied with air / gas mixture from its bottom and not laterally.
- the seal 110 between the body 102 of the burner and the combustion head 101 is then advantageously disposed near the bottom of said body 103, i.e. in a plane distant from the element radiant 104.
- the means which allow the combustion head 101 relative to the body 102 of the burner can be made up of complementary ramps 130, for example helical, which have the body 102 and the combustion head 101 and which allow a operator to release head 101 from body 102 by axially pivoting said head 101 relative to said body 102.
- the shaped element bell has a helical profile, which forces the mixture which goes up towards the radiant element to circulate in rotation outside of said bell-shaped element, which promotes exchanges with the interior faces of the mixing chamber.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
- la figure 1 est une vue en coupe d'un brûleur à gaz du type radiant conforme à un mode de réalisation particulier préféré de l'invention ;
- les figures 2a et 2d représentent schématiquement d'autres variantes possibles pour l'invention.
Claims (11)
- Brûleur à gaz, pour cuisinière ou table de cuisson, comportant une tête de combustion (1, 101) et une chambre de mélange (11, 111), ladite tête présentant un élément poreux radiant (4, 104), ladite chambre (11, 111) étant disposée sous l'élément radiant (4, 104) et recevant de l'air et du gaz pour alimenter ledit élément radiant en mélange air/gaz, au moins un élément (12, 112) formant obstacle à la circulation du mélange air/gaz étant disposé dans ladite chambre (11, 111), ledit élément formant obstacle (12, 112) envoyant le mélange air/gaz sur les faces latérales de la chambre de mélange (11, 111) pour les refroidir, caractérisé en ce que l'élément formant obstacle (12, 112) présente un contour général extérieur qui est analogue au contour intérieur de la chambre de mélange (11, 111) et qui définit avec celui-ci une lame de circulation dans laquelle le mélange air/gaz est forcé à circuler avant d'atteindre l'élément radiant, pour échanger convectivement avec la ou les parois latérales de la chambre de mélange (11, 111).
- Brûleur selon la revendication 1, caractérisé en ce que l'élément formant obstacle est une cloche (12, 112), cette cloche présentant un fond (13) entouré par des parois latérales (14) s'étendant à partir dudit fond (13) vers un fond (8) de la chambre de mélange (11) sur lequel ladite cloche est portée, l'intérieur de cette cloche (12, 112) étant alimenté en air et en gaz, le mélange formé dans ladite cloche (12, 112) s'évacuant de celle-ci au voisinage du fond (8) de la chambre de mélange, puis remontant jusqu'à l'élément radiant (4) en circulant dans la lame de circulation définie entre la ou les parois latérales de la cloche (12, 112) et la chambre de mélange (11).
- Brûleur selon la revendication 2, caractérisé en ce que la tête de combustion (1) peut être écartée du fond (8) de la chambre de mélange (11), au moins un élément (23) formant ressort étant comprimé entre le fond (8) de la chambre de mélange (11) et un organe butoir (21) s'étendant entre ledit ressort (23) et la tête de combustion (1), ledit élément formant ressort (23) étant disposé à l'intérieur de la cloche (12, 112), le brûleur comportant également des moyens de verrouillage pour s'opposer à l'action dudit élément formant ressort.
- Brûleur selon l'une des revendications 2 ou 3, caractérisé en ce que la cloche (12, 112) présente au moins une échancrure (17a) que traverse un canal (17) latéral pour l'alimentation de la chambre de mélange (11) en air et/ou en gaz.
- Brûleur selon l'une des revendications 1 à 3, caractérisé en ce que la chambre de mélange est alimentée en air et en gaz par son fond, et en ce que la tête de combustion présente une jupe en appui, par l'intermédiaire d'un joint d'étanchéité, sur ledit fond, ladite jupe définissant, avec ledit fond et l'élément radiant, la chambre de mélange.
- Brûleur selon l'une des revendications précédentes, caractérisé en ce que la tête de combustion (1) est portée par un corps (2) s'étendant à partir d'un fond (8) que présente la chambre de mélange (11), ledit corps (2) définissant ladite chambre de mélange (11) avec la tête de combustion (1).
- Brûleur selon la revendication 6, caractérisé en ce que ledit corps (2) présente une ouverture pour l'alimentation latérale de la chambre de mélange (11) en mélange air/gaz, la hauteur dudit corps (1) à partir dudit fond (8) jusqu'à la tête de combustion étant juste supérieure à la hauteur de ladite ouverture.
- Brûleur selon l'une des revendications précédentes, caractérisé en ce qu'il comporte une électrode (19) partiellement en saillie par rapport à la face frontale de l'élément radiant (4), cette électrode (19) étant reçue dans un élément tubulaire (18) s'étendant à l'intérieur de la chambre de mélange (11) jusqu'à l'élément radiant (4), ledit élément tubulaire (18) isolant électriquement le mélange air/gaz par rapport à ladite électrode (19).
- Brûleur selon la revendication 8, caractérisé en ce que l'élément tubulaire (18) traverse l'élément radiant (4) et est isolé thermiquement de celui-ci par une bague (20) de colle céramique dans laquelle il est noyé.
- Brûleur selon l'une des revendications 8 ou 9, caractérisé en ce que l'électrode (19) est positionnée au centre de l'élément radiant (4).
- Brûleur selon l'une des revendications précédentes, caractérisé en ce que l'élément radiant (4) est une membrane en un matériau poreux en fibres métalliques réfractaires frittées, cette membrane présentant une multitude de perforations.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9311670 | 1993-09-30 | ||
FR9311670A FR2710726B1 (fr) | 1993-09-30 | 1993-09-30 | Brûleur radiant à gaz pour cuisinière ou table de cuisson. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0651203A1 EP0651203A1 (fr) | 1995-05-03 |
EP0651203B1 true EP0651203B1 (fr) | 1998-02-04 |
Family
ID=9451424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94402191A Expired - Lifetime EP0651203B1 (fr) | 1993-09-30 | 1994-09-30 | Brûleur radiant à gaz pour cuisinière ou table de cuisson |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0651203B1 (fr) |
AT (1) | ATE163080T1 (fr) |
DE (1) | DE69408398D1 (fr) |
FR (1) | FR2710726B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1934532A1 (fr) | 2005-09-30 | 2008-06-25 | Indesit Company S.p.A. | Surface de cuisson à brûleur à gaz comprenant un élément semi-perméable |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2780345B1 (fr) | 1998-06-29 | 2000-09-08 | Valeo Climatisation | Circuit de fluide refrigerant, en particulier pour la climatisation de l'habitacle d'un vehicule automobile |
FR2780346B1 (fr) | 1998-06-29 | 2000-09-08 | Valeo Climatisation | Circuit de fluide refrigerant, notamment pour la climatisation de l'habitacle d'un vehicule automobile |
ITMI20051063A1 (it) * | 2005-06-09 | 2006-12-10 | Polidoro S P A | Bruciatore a gas provvisto di sistema di raffreddamento. |
EP2803912B1 (fr) * | 2013-05-14 | 2021-08-11 | Fenix Outdoor AB | Cuisinière portable |
CN108730982B (zh) * | 2017-04-13 | 2019-08-06 | 深圳市元疆科技有限公司 | 一种封闭燃烧炉头弹性自动泄压防爆结构 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1433771A (en) * | 1973-01-16 | 1976-04-28 | Parkinson Cowan Appliances Ltd | Gas burner |
US4533318A (en) * | 1983-05-02 | 1985-08-06 | Slyman Manufacturing Corporation | Radiant burner |
GB8405681D0 (en) * | 1984-03-05 | 1984-04-11 | Shell Int Research | Surface-combustion radiant burner |
US5313049A (en) * | 1990-10-01 | 1994-05-17 | Butagaz | Cooking top cover with motorized retractable closure means assembly |
-
1993
- 1993-09-30 FR FR9311670A patent/FR2710726B1/fr not_active Expired - Fee Related
-
1994
- 1994-09-30 DE DE69408398T patent/DE69408398D1/de not_active Expired - Lifetime
- 1994-09-30 EP EP94402191A patent/EP0651203B1/fr not_active Expired - Lifetime
- 1994-09-30 AT AT94402191T patent/ATE163080T1/de not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1934532A1 (fr) | 2005-09-30 | 2008-06-25 | Indesit Company S.p.A. | Surface de cuisson à brûleur à gaz comprenant un élément semi-perméable |
EP2182293A1 (fr) | 2005-09-30 | 2010-05-05 | Indesit Company S.p.A. | Plaque de cuisson avec brûleur à gaz comprenant un élément semi-perméable |
Also Published As
Publication number | Publication date |
---|---|
FR2710726A1 (fr) | 1995-04-07 |
ATE163080T1 (de) | 1998-02-15 |
FR2710726B1 (fr) | 1999-08-27 |
EP0651203A1 (fr) | 1995-05-03 |
DE69408398D1 (de) | 1998-03-12 |
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