FR2674001A1 - Premixing gas burner - Google Patents

Abstract

Pre-mix gas burner for a gas stove with several combustion chambers (1) parallel to each other, supplied with a primary gas / air mixture by nozzles which blow through mixing tubes, said mixture exiting from the upper faces (5) of the combustion chambers (1) through nozzles (7) arranged on faces inclined with respect to each other, and with orifices (10, 11) allowing the formation of progressive ignition flames , these ignition orifices being arranged on non-inclined faces at the top (5) of the combustion chambers and on the edges (9) thereof.

Description

The present invention relates to a gas burner premixed with

several combustion chambers

  roughly parallel to each other, alimen-

  tees in a primary gas / air mixture by nozzles which blow

  flow in mixing tubes, said mixture leaving the upper faces of the combustion chambers by nozzles arranged on faces inclined with respect to each other, and with orifices allowing the formation of

progressive ignition flames.

  Such a burner is known. The ignition orifices

  were placed on this burner on the inclined part

  born from the upper face of the combustion chambers

  limited vis-à-vis neighboring combustion chambers to

  a certain distance, by an inclined sheet metal tongue.

  To allow the gradual ignition of the burner ramps

  their, the fixing plate was pierced with holes o not-

  know the flames which, after the lighting of the ramps,

  flared with the flames of the combustion chamber

  sine As a result of the joint combustion of two flames,

  there is formation of CO due to the lack of oxygen, which.

in any case should be avoided.

  The present invention therefore aims to achieve a gradual ignition of the ramps operating correctly on a burner of the aforementioned type, while avoiding the

CO formation after ignition.

  To achieve this object, in accordance with the invention, it is provided that the ignition orifices are arranged

  on non-inclined faces at the top of the

  bustion and on the edges of these, and that, as al-

  ternative, air shutters are arranged in the A, -2-

  intervals between the combustion chambers and the

  killed by an elastic U-shaped sheet fixed by snap-fastening on two neighboring combustion chambers provided with at least

an appropriate throat.

  This allows the flames to be brought as close as possible to each other without, however, mixing them. Ansi, the supply of secondary air into the combustion zone is possible, the quantity of which can be reduced so that

  the ignition is not affected, but in sufficient quantity

  health for the complete combustion of the gas / air mixture

mayor.

  If, when installing a space heater

  such as a circulating or instantaneous water heater, it is necessary to provide one or more shutters

  air, these prefabricated shutters can be interca-

  Strips between two or more combustion chambers Similarly

  me, if, due to the special conditions instead of

  tallation, such shutters are not necessary, they can be removed from the burner if it were

  equipped to make it work without these shutters Finale-

  It is even possible to move shutters whose

  would be equipped the burner to put them in posi-

  particularly favorable for priming.

  This considerably facilitates the start-up of

the heater.

  According to the invention, it is proposed to arrange the

  ignition ports in protrusions of the combustion chambers

  bustion, close together, even in contact with one

with the other.

  This realization allows a very easy ignition while

  ensuring the supply of secondary air also after the

  lighting. Finally, it is particularly advantageous to

  provide for ignition holes or as spouts in form

  me of elongated slits, which extend into the

  protrusions, or as holes arranged separately in the

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  say protrusions and which do not communicate with the beaks

in the form of slits.

  Another improvement consists in that the bottom

of P'U is partly removed.

  Another advantageous improvement is obtained by the fact that the bottom of the PU is made in the form of a mushroom so as to generate an enlargement which rests on the

  upper face of the combustion chamber and thus forms

if a tight contact line.

  Below, two exemplary embodiments of the invention

  are described with Figures 1 to 7 of the accompanying drawing.

The figures show;

  Fig 1, a sectional view of a pre-mix burner

  alable, Fig 2, a detail in a plan view, Fig 3, a variant of the invention, Fig 4, a section of the representation according to fig 3, and

  Fig 5 to 7, an air duct shutter.

  In all the figures, the same references indicate

the same details.

  A pre-mix burner of a gas stove or gas water heater is designed as a multi-burner with a multitude of standing combustion chambers 1 of roughly prismatic shape, which at a certain distance 2 , are arranged fairly parallel

  one in relation to the other All bedrooms

  bustion are supplied with a primary gas / air mixture by one or more mixing tubes which cooperate with

  a gas nozzle provided at a certain distance, said mete

  diaper entering inside 3 of the combustion chambers

  tion The combustion chambers have side walls 4 and upper faces 5 comprising in inclined parts 6 slits in the form of slots 7, through which the fuel mixture exits, all the slots 7 see fig 2 being parallel with respect to each other and

4 2674001

  separated by a strip 8 In the margi-

  nale 9 of two combustion chambers 1, the upper face

  re 5 is provided with horizontal faces 13 or, in other words, not inclined with respect to the vertical It is here that

  find ignition orifices 10, either in the form of a window

  your 7 elongated according to fig 2, left part, either

  me 11 isolated holes, independent of the slots These ori-

  ignition sockets are provided on protrusions 12 of the chambers

  flames of combustion, which extend in space

  free 2 by shrinking it considerably or completely.

  According to fig 1, the projections touch, according to fig 2, they are at a certain distance 13 relative to each other Whether there is this distance 13 and how wide, this is what depends from the place of installation

  and the burner load Strong draft and conditions

  Difficult ignition requirements require a short distance

  pick or its pure and simple deletion, in the case

  milking or with easily ignitable gases - you can

  predict it, even with a certain width.

  The essence of the present invention is that the o-

  ignition ports 10, whether designed as windows

  your 7 extending into the projections 12 or as separate holes there, are provided in a marginal part

  horizontal of the upper face 5 of the control chamber

  bustion Thus, the flames coming out of the light ports

  mage 10 burn independently of each other, leaving room for secondary air which arrives through space 2 and can penetrate between the flames and contributes

  thus to the complete combustion of the primary gas / air mixture

  re Any inclination of the flames between them in the zo-

  ignition should be avoided so that they do not mix

  not good on burning In this case, there is formation of oxy-

  of carbon, the influx of secondary air being prevented.

  Let all of the two marginal parts 9 be oriented

  vertically, horizontally or at an angle, is irrelevant

  tance, provided that both parties present the same

-

  tilt or be horizontal.

  Thanks to the invention, the progressive ignition of a burner

  their premixing with multiple ramps is ensured, even under unfavorable draft conditions due

  from the chimney to which the heating appliance is connected

  fé by the burner considered or in the case of diffuse gas

  fires to ignite, such as liquefied gas.

  A premix burner for an instantaneous water heater for the preparation of domestic water according to fig 3 includes two separate support bars 102 and 103

  by distance 101 and supporting the burner elements.

  Between these bars are housed several combustion chambers.

  tion 104, each upper face of which is provided with a cooling tube 105 filled with water The straight elements 106 of the cooling tubes are interconnected by

  elbows 107 which pierce the support bars By the tu-

  be cooling, part of the water to be heated by

  the water heater is heated The main heat exchanger

  cipal of the water heater is above the burner and is not shown The cooling tube can be connected hydraulically in series or in parallel The combustion chambers 104 are separated from each other by spaces 108 equidistant Through these spaces , the air

  secondary arrives at the upper side of the

  bustion, fitted with nozzles 109 The combustion chambers are supplied with a primary gas / air mixture by several mixing tubes each combined with a gas nozzle One of the combustion chambers 104 is provided with

  an ignition electrode; it is therefore lit first

  re, the flames emerging in this room must then

  spread to neighboring combustion chambers At this ef-

  fet, distances 108 must be skipped To ensure

  this transfer to a specific area - it is possible

  ble, without this being compulsory, to plan between all

  the combustion chambers 104 of the air shutters

  fixed between neighboring rooms by snap-fastening.

  6 - This binding is better shown in fig 4 which shows a

  left combustion chamber 104 and a combustion chamber

  straight line 104 forming between them the space 108 already men-

  As can be seen, the nozzles 109 are arranged in an inclined part of the upper face 111 of the combustion chamber 104 The nozzles situated on either side of the cooling tube 105 are opposed The chamber

  proper combustion includes a tu-

  be mixer 112 into which the upper part is introduced

  113 of the combustion chamber, fixed in this tube by wedging at point 114 Part 113 has

  a molding 115, roughly V-shaped The part sees

  sine is also fitted with such a molding, the two molds

  lures extending in space 108.

  The air shutter 110 according to FIG. 7 has a mushroom-shaped head 116, the largest of which

  extent 117 exceeds the width of the space 108 If the ob-

  turator 110 is put in place, this results in a tight contact line 118 along the uppermost parts of the combustion chambers 104 The head 116 is extended by inclined branches 119 approaching one another and whose tips not looking at the head 116 are

  fitted with V-shaped moldings 120 extending towards the ex-

  The shutter is made of sheet steel to

  spells, the branches 119 undergoing a tension directed towards

  the exterior For mounting the shutter in an es-

  pace 108 between two neighboring combustion chambers 104,

  the branches 119 must be compressed They are

  troduits in space 108 by their ends 121 sliding on the external walls 122 of the combustion chambers 104 In contact with the moldings 115 with which the walls of the combustion chambers are provided, they are compressed even more to engage in the recesses 123 downstream of the moldings 115 The moldings 115 and the recesses 123 are

  arranged so that the moldings 120 are prestressed

  tes and the air shutter applied thus with its head in

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  mushroom shape on the combustion chambers, which

  gives rise to the waterproof contact line 118.

  From Figs 5 and 6, it follows that part of the course

  U-shaped bure 124 of the mushroom-shaped head 116 is removed so that the part 125 of the shutter is formed only by the walls 119 This results in a channel 126 formed on the one hand by the remains of the head 116, and on the other by the two walls 119, channel limited by the support bar

  102 as shown in fig 3, above.

8 -

Claims (5)

Claims   1 gas burner premixed with several combustion chambers approximately parallel to each other, between which are formed   spaces used for the supply of secondary air   re and supplied with a primary gas / air mixture by nozzles which blow into mixing tubes,   said mixture leaving the upper faces of the chambers   burners by burners arranged on facets   these inclined with respect to each other, and with orifices allowing the formation of progressive ignition flames, characterized in that the ignition orifices (10, 11) are arranged on faces (13) not inclined at the top (5) rooms   combustion (1) and on the edges (9) thereof.   2 Pre-mix gas burner according to resale   dication 1, characterized in that the ignition orifices (10, 11) are provided in projections (12)   formed by the combustion chambers (1) and tightened   rant the distance (2) between them.   3 Pre-mix gas burner according to resale   indication 1 or 2, characterized in that the ori-   ignition plugs (10) are designed as an extension of the slots (7) in the form of slots or as holes (11) isolated from said spouts. 9 _   4 Pre-mixed gas burner according to the pre-   bule of claim 1, characterized in that air shutters (110) are arranged in the intervals between the combustion chambers and made of an elastic U-shaped sheet fixed by snap-fastening on two adjacent combustion chambers (104) provided   at least one suitable molding (115/123).   Pre-mixed gas burner according to claim 4, characterized in that the bottom (124) of the U is partly removed.   6 Pre-mix gas burner according to the resale   dication 4 or 5, characterized in that the bottom (124) of P'U is made in the form of a mushroom (116)   so as to generate an enlargement (117) which is   then on the upper side of the combustion chamber   tion (104) and thus forms a tight contact line che (118).