EP1838996A1 - Gas burner, in particular for domestic cooking appliances - Google Patents

Gas burner, in particular for domestic cooking appliances

Info

Publication number
EP1838996A1
EP1838996A1 EP06704362A EP06704362A EP1838996A1 EP 1838996 A1 EP1838996 A1 EP 1838996A1 EP 06704362 A EP06704362 A EP 06704362A EP 06704362 A EP06704362 A EP 06704362A EP 1838996 A1 EP1838996 A1 EP 1838996A1
Authority
EP
European Patent Office
Prior art keywords
burner
gas
injector
presents
flame
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.)
Withdrawn
Application number
EP06704362A
Other languages
German (de)
French (fr)
Inventor
Carlo Paesani
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.)
Defendi Italy SRL
Original Assignee
Defendi Italy SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Defendi Italy SRL filed Critical Defendi Italy SRL
Publication of EP1838996A1 publication Critical patent/EP1838996A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F24C3/08—Arrangement or mounting of burners
    • F24C3/085—Arrangement or mounting of burners on ranges
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/06—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with radial outlets at the burner head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2207/00—Ignition devices associated with burner

Definitions

  • the present invention relates to a gas burner, in particular for domestic cooking appliances.
  • This gas system is formed from various components:
  • the gas system hence consists of a sub-assembly consisting of the ramp with relative cross arms welded together, control valves mounted on the ramp, and gas tubes which connect the valves to the injectors, these being fixed to the cross arms in any manner.
  • This sub-assembly is fixed to the cooker structure by screwing the outer ends of the cross arms to the lateral sheet metal parts of the cooker.
  • the sheet metal cooker top is then fixed to the structure.
  • the cooker top presents holes corresponding with the injectors, to allow passage of the venturi tube attached to the burner base.
  • the burner also comprises the Venturis and the base, usually in the form of two pieces of sheet metal joined together, and a flame divider, also of sheet metal or of pressed aluminium.
  • a die-cast aluminium support is used, also acting as the venturi, on which the base is fixed and about which the base is centered; this ensures better alignment, however the constituent parts of the burner are of large number and costs are higher.
  • Another drawback consists of the fact that, if present, the ignition plug is normally fixed to the cooker top and is hence not subjected to centering about the burner.
  • An object of the invention is to create a gas sub-assembly consisting of only a few parts and hence of low production cost, but which at the same time ensures good operation and practicality of use, such as ease of cleaning and of treatment of the movable parts.
  • Figure 1 is a longitudinal section through the burner
  • Figure 2 is a perspective view of the flame divider
  • Figure 3 is a perspective view of the bracket
  • Figure 4 is a plan view of the cooker top from above
  • Figure 5 shows a variant of the bracket.
  • the burner is composed substantially of an injector support 1 , an injector 2, a bracket 3, a flame divider 4 and an enamelled cap 5.
  • the bracket 3 is of U-shape and lowerly presents a horizontal surface 7 comprising a hole in which the injector support 1 is locked by means of a spring 8.
  • the surface 7 extends into two vertical walls 9 and upperly presents two flanges containing two opposing holes 11 through which screws 12 are screwed for fixing the bracket 3 to the upper sheet metal of the cooker top 14.
  • One of the two flat flanges 10 of the bracket 3 presents an extension 15 in which two seats are provided for possibly housing the ignition plug 16 and the thermocouple 18.
  • a slot 19 is present, passing through both a flange 10 and a vertical wall 9.
  • the cooker top 14 upperly presents a raised collar 20, external to the cooker top 14 there being provided the flame divider 4 on which the enamelled closure cap 5 rests.
  • the flame divider 4 centrally presents a frusto-conical vertical conduit 21 , which forms the first portion of the venturi and communicates upperly with a portion 22 shaped to form, together with the inner surface 23 of the cap 5, a radially extending horizontal conduit 24 producing a venturi effect.
  • the flame divider 4 externally presents an edge 25 along which a series of ports 26 are present for exit of the air-gas mixture, to form a flame ring.
  • the flame divider 4 In its lower portion external to the conduit 21 , the flame divider 4 presents a centering fin 27, two walls 28 and 29, and bearing surfaces 30 and 31.
  • the bracket 3 which is constructed in one piece to ensure that the system is coaxial.
  • the frusto-conical conduit 21 of the flame divider 4, forming the first portion of the venturi is perfectly aligned with the injector 2 by virtue of the fin 27 and the walls 28 and 29. This enables perfect gas distribution to be achieved along the ports 26, with a resultant regular and uniform flame ring.
  • the burner venturi is formed, in combination with the inner surface 23 of the cap 5, directly on the flame divider 4, with a vertical portion 21 and a radial portion 22. This eliminates the need to apply vertical Venturis, hence reducing cost.
  • the radial venturi also enables the height of the bracket 3 to be reduced, with evident constructional and cost advantages.
  • the flame divider 4 rests on the bracket 3 and not on the cooker top 14; this means that less heat is transmitted to the cooker top, hence resulting, if this latter is of stainless steel sheet construction, in lesser yellowing of the sheet metal.
  • the system is also very easy to clean: in this respect, if liquids spill over from the pan, the rim 20 provided on the cooker top 14 prevents penetration of the water into the interior of the cooker.
  • the rim 20 also prevents dirt penetration into the interior when cleaning the cooker top.
  • the primary air 32 required for mixing with the gas originates from the interior of the cooker.
  • primary air is taken from outside the cooker (primary air 33).
  • bracket 3 merely has to be made from a portion of cylindrical pipe, shaping the walls 28 and 29 and the surfaces 30 and 31 in a manner suitable to create air passageways, then raising the flame divider 4 a further few millimetres from the cooker top 14.
  • the two traditional cross arms are shaped to form two brackets in each of them (see Figure 5). In this manner, even if the cross arms are screwed to the side structure of the cooker, the burners are centered about the cross arm, to always provide injector-venturi alignment.
  • Special burners such as fish kettle and double or triple ring burners, are also used on medium and low cost cookers, consequently the constructional concept described in the present patent is also valid for special burners.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

For domestic appliances, a gas burner provided with a gas arrival pipe fixed to an injector support with which an injector is associated, characterised in that the lower portion of the burner venturi and the injector support are centered within another element (3) formed in one piece.

Description

GAS BURNER, IN PARTICULAR FOR DOMESTIC COOKING APPLIANCES
The present invention relates to a gas burner, in particular for domestic cooking appliances.
Various types of gas burners exist for cookers, from those intended for top of the range cookers and hence of high performance and of costly material construction, to those intended for medium and bottom of the range cookers and hence of lowest possible cost construction.
However even within this latter product range there is a tendency to seek to construct products which always ensure good performance, such as very low CO values, very high thermal efficiency, ease of use and easy cleaning, while at the same time seeking to maintain a very low cost, compatible with that of very low-cost finished products such as those present on the South American market.
Within this product range, commercially available cookers have a gas system based on the cross arm concept.
This gas system is formed from various components:
- a normally L- or U-shaped pipe known as the gas ramp, which carries the gas to the cooker interior and is provided on its front part with holes to which the control valves are fixed, - tubes carrying the gas from the valves to the injectors;
- two suitably bent steel strips, known as the cross arms, which are welded transversely to the gas ramp and are hence disposed parallel to the front part of the cooker. These cross arms are provided with holes, in each of which an injector and the relative gas arrival tube are positioned. The gas system hence consists of a sub-assembly consisting of the ramp with relative cross arms welded together, control valves mounted on the ramp, and gas tubes which connect the valves to the injectors, these being fixed to the cross arms in any manner.
This sub-assembly is fixed to the cooker structure by screwing the outer ends of the cross arms to the lateral sheet metal parts of the cooker. The sheet metal cooker top is then fixed to the structure. The cooker top presents holes corresponding with the injectors, to allow passage of the venturi tube attached to the burner base.
The burner also comprises the Venturis and the base, usually in the form of two pieces of sheet metal joined together, and a flame divider, also of sheet metal or of pressed aluminium.
This system presents certain drawbacks, and in particular:
- alignment between the injector and the venturi is not assured, particularly if, welded to the cross arm, there is a further bridge piece upperly presenting a hole enabling the venturi tube to be centered on the injector; this often causes off-centre gas distribution so that the flames can be seen to be nonuniform,
- gas leakage problems and problems of alignment with the top of the burner, as in some cases the injector is fixed directly on the cross arm,
- in other cases a die-cast aluminium support is used, also acting as the venturi, on which the base is fixed and about which the base is centered; this ensures better alignment, however the constituent parts of the burner are of large number and costs are higher.
Another drawback consists of the fact that, if present, the ignition plug is normally fixed to the cooker top and is hence not subjected to centering about the burner. An object of the invention is to create a gas sub-assembly consisting of only a few parts and hence of low production cost, but which at the same time ensures good operation and practicality of use, such as ease of cleaning and of treatment of the movable parts. This and further objects which will be- apparent from the ensuing description are attained according to the invention by a gas burner for appliances, as described in claim 1.
A preferred embodiment of the present invention is described in detail hereinafter with reference to the accompanying drawings, in which: Figure 1 is a longitudinal section through the burner, Figure 2 is a perspective view of the flame divider, Figure 3 is a perspective view of the bracket, Figure 4 is a plan view of the cooker top from above, and Figure 5 shows a variant of the bracket. As can be seen from the figures the burner is composed substantially of an injector support 1 , an injector 2, a bracket 3, a flame divider 4 and an enamelled cap 5.
An aluminium pipe 6, on which the injector support 1 is fixed by compression and which is connected to the control valve, not shown in the drawings, is screwed to the injector 2.
The bracket 3 is of U-shape and lowerly presents a horizontal surface 7 comprising a hole in which the injector support 1 is locked by means of a spring 8.
The surface 7 extends into two vertical walls 9 and upperly presents two flanges containing two opposing holes 11 through which screws 12 are screwed for fixing the bracket 3 to the upper sheet metal of the cooker top 14. - A -
One of the two flat flanges 10 of the bracket 3 presents an extension 15 in which two seats are provided for possibly housing the ignition plug 16 and the thermocouple 18.
In one side of the bracket 3 a slot 19 is present, passing through both a flange 10 and a vertical wall 9.
The cooker top 14 upperly presents a raised collar 20, external to the cooker top 14 there being provided the flame divider 4 on which the enamelled closure cap 5 rests.
The flame divider 4 centrally presents a frusto-conical vertical conduit 21 , which forms the first portion of the venturi and communicates upperly with a portion 22 shaped to form, together with the inner surface 23 of the cap 5, a radially extending horizontal conduit 24 producing a venturi effect.
The flame divider 4 externally presents an edge 25 along which a series of ports 26 are present for exit of the air-gas mixture, to form a flame ring.
In its lower portion external to the conduit 21 , the flame divider 4 presents a centering fin 27, two walls 28 and 29, and bearing surfaces 30 and 31.
When the flame divider 4 is positioned on the bracket 3, the centering rib 27 rests in the seat 19, the two walls 28 and 29 are interposed centrally between the walls 9 of the bracket 3, and the surfaces 30 and 31 rest on the bracket flanges 10.
Hence all the constituent parts of the burner essential for its proper operation are all centered on a single component, the bracket 3, which is constructed in one piece to ensure that the system is coaxial. In this manner the frusto-conical conduit 21 of the flame divider 4, forming the first portion of the venturi, is perfectly aligned with the injector 2 by virtue of the fin 27 and the walls 28 and 29. This enables perfect gas distribution to be achieved along the ports 26, with a resultant regular and uniform flame ring.
The burner venturi is formed, in combination with the inner surface 23 of the cap 5, directly on the flame divider 4, with a vertical portion 21 and a radial portion 22. This eliminates the need to apply vertical Venturis, hence reducing cost. The radial venturi also enables the height of the bracket 3 to be reduced, with evident constructional and cost advantages.
Moreover, the flame divider 4 rests on the bracket 3 and not on the cooker top 14; this means that less heat is transmitted to the cooker top, hence resulting, if this latter is of stainless steel sheet construction, in lesser yellowing of the sheet metal.
The system is also very easy to clean: in this respect, if liquids spill over from the pan, the rim 20 provided on the cooker top 14 prevents penetration of the water into the interior of the cooker. The rim 20 also prevents dirt penetration into the interior when cleaning the cooker top. There are only two movable parts: the flame divider 4 and the enamelled cap 5, both easily cleanable either by hand or in a dishwasher.
After cleaning, positioning the flame divider 4 in its seat in the bracket 3 is particularly easy and unmistakeable because of the rib 27 and the particular shape of the hole in the sheet metal of the cooker top 14. With the embodiment shown in the drawings the primary air 32 required for mixing with the gas originates from the interior of the cooker. In a variant, primary air is taken from outside the cooker (primary air 33).
To achieve this, the bracket 3 merely has to be made from a portion of cylindrical pipe, shaping the walls 28 and 29 and the surfaces 30 and 31 in a manner suitable to create air passageways, then raising the flame divider 4 a further few millimetres from the cooker top 14.
In a further variant, instead of forming a single bracket for each burner, the two traditional cross arms are shaped to form two brackets in each of them (see Figure 5). In this manner, even if the cross arms are screwed to the side structure of the cooker, the burners are centered about the cross arm, to always provide injector-venturi alignment.
Special burners, such as fish kettle and double or triple ring burners, are also used on medium and low cost cookers, consequently the constructional concept described in the present patent is also valid for special burners.

Claims

C L A I M S
1. For domestic appliances, a gas burner provided with a gas arrival pipe fixed to an injector support with which an injector is associated, characterised in that the lower portion of the burner venturi and the injector support are centered within another element (3) formed in one piece.
2. A burner as claimed in claim 1 , characterised in that said element (3) is formed from a sheet metal strip.
3. A burner as claimed in claim 1 , characterised in that said sheet metal strip is elongated, with more than one element (3) being formed on it.
4. A burner as claimed in claim 1 , characterised in that the burner is composed substantially of an injector support (1 ), an injector (2), an element (3), a flame divider (4) and a cap (5).
5. A burner as claimed in claim 1 , characterised in that the element (3) is U-shaped and carries in its lower part a hole for locking the injector support (1).
6. A burner as claimed in claim 6, characterised in that the element (3) is provided with flanges (10).
7. A burner as claimed in claim 4, characterised in that the flame divider (4) lowerly presents a centering rib (27), walls (28, 29), and bearing surfaces (30, 31) which cooperate with the flanges (10) of the element (3) by resting on them.
8. A burner as claimed in claim 4, characterised in that the flame divider (4) and the cap (5) define a radial venturi portion.
9. A burner as claimed in claim 4, characterised in that the flame divider presents along its outer edge a series of ports for exit of the air-gas mixture, to form a flame ring.
10. A burner as claimed in claim 1 , characterised in that the primary air required for mixing with the gas originates from the interior (32) of the cooker.
11. A burner as claimed in claim 1 , characterised in that the primary air required for mixing with the gas originates from the exterior (33) of the cooker.
12. A burner as claimed in claim 1 , characterised in that the element (3) presents an extension (15) on which the ignition plug (16) is housed.
13. A burner as claimed in claim 1 , characterised in that the element (3) presents an extension (15) on which the ignition plug (16) and the thermocouple (18) are housed.
14. A burner as claimed in claim 1 , characterised in that the flame divider presents several mutually concentric flame rings.
15. A burner as claimed in claim 1 , characterised in that the flame divider is of fish kettle shape.
16. A burner as claimed in claim 1 , characterised in that the lower portion of the venturi is of frusto-conical shape.
17. A burner as claimed in claim 1 , characterised in that the lower portion of the venturi is of cylindrical shape.
EP06704362A 2005-01-20 2006-01-16 Gas burner, in particular for domestic cooking appliances Withdrawn EP1838996A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000003A ITVE20050003A1 (en) 2005-01-20 2005-01-20 GAS BURNER, IN PARTICULAR FOR DOMESTIC COOKING EQUIPMENT.
PCT/EP2006/000304 WO2006077058A1 (en) 2005-01-20 2006-01-16 Gas burner, in particular for domestic cooking appliances

Publications (1)

Publication Number Publication Date
EP1838996A1 true EP1838996A1 (en) 2007-10-03

Family

ID=36156052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06704362A Withdrawn EP1838996A1 (en) 2005-01-20 2006-01-16 Gas burner, in particular for domestic cooking appliances

Country Status (6)

Country Link
EP (1) EP1838996A1 (en)
BR (1) BRPI0606674A2 (en)
IT (1) ITVE20050003A1 (en)
MX (1) MX2007008701A (en)
RU (1) RU2380614C2 (en)
WO (1) WO2006077058A1 (en)

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BRPI0605270A (en) * 2006-12-11 2008-01-15 Bsh Continental Eletrodomestic improvement introduced in stove
EP2439454A1 (en) * 2010-10-11 2012-04-11 BSH Bosch und Siemens Hausgeräte GmbH Gas burner for a cooking device
CN102538029B (en) * 2010-12-24 2015-11-25 博西华电器（江苏）有限公司 A kind of gas-cooker
AU2013205632B2 (en) * 2012-02-01 2015-12-24 Sabaf S.P.A. A gas burner for domestic cooktop
US9612018B2 (en) 2012-02-01 2017-04-04 Sabaf S.P.A. Gas burner for domestic cooktop
DE102012206507A1 (en) 2012-04-20 2013-10-24 BSH Bosch und Siemens Hausgeräte GmbH Burner for a gas-fired cooking appliance
US9464812B2 (en) * 2012-10-29 2016-10-11 Whirlpool Corporation Gas supply module for burner with beaded gas supply tube
ES2538286B1 (en) * 2013-12-18 2016-04-26 Bsh Electrodomésticos España, S.A. Gas burner, gas burner arrangement, and cooking point
ES2569279B1 (en) * 2014-11-06 2017-02-15 Bsh Electrodomésticos España, S.A. Bottom of burner for a gas burner, gas burner, and gas cooking point
WO2018224270A1 (en) * 2017-06-09 2018-12-13 Arcelik Anonim Sirketi Fastener for burner injector bearer, oven with such fastener and associated production method
CN108253461A (en) * 2018-02-02 2018-07-06 广东美的厨房电器制造有限公司 Open burner and kitchen range
TR201909667A2 (en) * 2019-06-28 2021-01-21 Bsh Ev Aletleri San Ve Tic As ONE GAS COOKER

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Also Published As

Publication number Publication date
MX2007008701A (en) 2007-09-11
BRPI0606674A2 (en) 2009-07-07
RU2380614C2 (en) 2010-01-27
WO2006077058A1 (en) 2006-07-27
ITVE20050003A1 (en) 2006-07-21
RU2007131439A (en) 2009-02-27

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