Title:
MODULAR BURNER WITH AN OPTIMIZED SUPPLY FOR A HOB
Kind Code:
A1


Abstract:
Modular burner for a hob of a cooking appliance, characterised in that it comprises a base body (20) in turn comprising a frame (22), a burner base (21,121) mountable centrally onto the frame (22), at least one lid (11,12,111) intended to close on the upper part the frame (22) and the burner base (21,121) and at least one distribution chamber (60,160,260) fixed beneath one side (22′) of the frame (22), said distribution chamber being provided with at least one nozzle (70) for supplying gas and connected with at least one Venturi pipe (71,72,73) and with primary air suction inlets (75) in such a manner to receive the gas supply and distribute it to the modular burner.



Inventors:
Inzaghi, Enzo (Conegliano (Treviso), IT)
Application Number:
12/449863
Publication Date:
04/15/2010
Filing Date:
03/06/2008
Assignee:
Steel Time S.p.A. (Pordenone, IT)
Primary Class:
International Classes:
F24C3/08
View Patent Images:
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Primary Examiner:
SAVANI, AVINASH A
Attorney, Agent or Firm:
HEDMAN & COSTIGAN, P.C. (NEW YORK, NY, US)
Claims:
1. Modular burner for a hob of a cooking appliance, characterised in that it comprises a base body (20) in turn comprising a frame (22), a burner base (21,121) mountable centrally onto the frame (22), at least one lid (11,12,111) intended to close on the upper part the frame (22) and the burner base (21,121) and at least one distribution chamber (60,160,260) fixed beneath one side (22′) of the frame (22), said distribution chamber being provided with at least one nozzle (70) for supplying gas and connected with at least one Venturi pipe (71,72,73) and with primary air suction inlets (75) in such a manner to receive a gas supply and distribute it to the modular burner.

2. Modular burner according to claim 1, characterised in that said burner is quadrangular-shaped, preferably squared.

3. Modular burner according to claim 1, characterised in that said frame (22) comprises four arms, of which one to three are support arms (23) and at least one is a burner arm (24), which extend radially towards the centre of the frame.

4. Modular burner according to claim 3, characterised in that said burner has a square frame (22) with three support arms (23) projecting from the centre of three sides of the frame and one burner arm (24) projecting from the centre of the remaining side (22′) of the quadrangular frame (22).

5. Modular burner according to claim 3, characterised in that said burner has a square frame (22) with two support arms (23) and two burner arms (24).

6. Modular burner according to claim 3, characterised in that each burner arm (24) is U-shaped with flaps (35) and it is provided with a channel (29′) connected to a longitudinal recess (73) provided on the side (22′) of the frame (22) for supplying gas to the entire burner base (21), said burner arm (24) further having flame spreader grooves (30) provided along the edge of the flaps (35) of the U-shape.

7. Modular burner according to claim 6, characterised in that each burner arm (24) has a lower bracket (38) adapted to be connected to a corresponding lower abutment (37) extending from the burner base (21,121).

8. Modular burner according to claim 7, characterised in that said burner base (21) is provided for equipped with radial channels (27) configured in a manner such to correspond to the arms (23,24) in such a manner to be supported by the latter and allow the circulation of the gas supplied by said at least one channel (29′).

9. Modular burner according to claim 8, characterised in that said recess (73), closed on the upper part by the lid (11), is in turn connected with a distribution chamber (60,160,260) for supplying and distributing gas to the entire burner base (21), through at least one opening (71) provided with a throttle (72) passing through the bottom of the recess itself and ending up in the recess in such a manner to cooperate to provide a Venturi pipe.

10. Modular burner according to claim 9, characterised in that fixed beneath the frame (22) is a holder (78) for collecting the drippings provided with a perimeter fixing edge (78′) corresponding to the shape of the frame (22) and having an extended opening (79) along the side (22′) of the frame from which the burner arm (24) extends.

11. Modular burner according to claim 10, characterised in that said distribution chamber (60,160,260) is oblong-shaped in such a manner to substantially extend along the entire side (22′) of the frame (22) from which the burner arm (24) extends centrally.

12. Modular burner according to claim 11, characterised in that said distribution chamber (60,160,260) comprises a tray (64) contoured by a perimeter edge (65) through which it is fixed beneath the frame (22) with the perimeter edge (78′) of the holder (78) interposed at the opening (79) of such perimeter edge (78′) said distribution chamber (60,160,260) is supplied through a main gas pipe (61) ending in at least one coupling (62) which is inserted into the tray (64).

13. Modular burner according to claim 12, characterised in that the distribution chamber (60,160,260) is supplied in at least one supply position, provided through an inlet pipe (67) connected to a corresponding fitting (62) connected to the main gas pipe (61) each inlet pipe (67) being provided inside a pipe (63) provided with reinforcement ribs (69) connected to the external of the distribution chamber (60,160,260) beneath the tray (64) and fixed to the perimeter edge (65) of the latter in proximity to the internal end, each inlet pipe is connected perpendicularly to a channel (68) which passes through the bottom of the tray (64) and it is preset to accommodate a nozzle (70) facing the bottom of the frame (22) arranged over the tray (64) directly beneath the opening (71).

14. Modular burner according to claim 13, characterised in that the side (22′) of the frame is provided on the lower side, along the entire length of the two sides, with primary air inlet fittings (75) to allow its suctioning through the depression caused by the gas emitted by the nozzle which passes through the Venturi pipe provided at the opening (71) with the related throttle (72) which ends up in the recess (73).

15. Modular burner according to claim 1, characterised in that said distribution chamber is alternatively provided with one, two or three nozzles (70) each facing a corresponding Venturi pipe (71,72,73).

16. Modular burner according to claim 9, characterised in that said burner comprises a first distribution chamber (260) provided with two nozzles (70) and a second distribution chamber (60) provided with three nozzles (70) and in which the frame (22) is consequently provided with two sides (22′) departing from which are two burner arms (24) and consequently the perimeter edge (78′) of the holder (78) is correspondingly provided with two openings (79).

17. Modular burner according to claim 1, characterised in that said burner is of the double burner type (100) with a low flame and a high flame, comprising the base body (20) comprising the frame (22) intended to surround a double crown burner, provided with a burner base (121) with an external crown (122) and an internal crown (123) connected, correspondingly said frame and said burner base are closed on the upper part respectively by means of the lid (11) and a lid (111) of the double crown burner in turn provided with an external crown (112) and an internal crown (113).

18. Modular burner according to claim 17, characterised in that the two burner arms (24) of the frame (22) supply a first channel (127′) and a second channel (127″) of the burner base, the first channel (127′) being connected to the distribution chamber (60) with three nozzles (70), feeds the external crown (122), and the second channel (127″) connected to the distribution chamber (260) with nozzles, feeds the internal crown (123) between said two crowns (122, 123) being provided flow separator elements (128) to avoid preferential paths of the flows.

Description:

The present invention regards a modular burner with an optimised supply for a hob of a cooking appliance.

Hobs for cookers, bearing a plurality of burners arranged at the centre of hobs and provided with underlying holders adapted to collect the drippings and food remnants overflowing from the cooking containers, have been known over the years.

Such burners are usually made circular-shaped and they are provided with a plurality of holes or grooves around the circumference for releasing gas, flame spreaders, through which the flame is distributed to heat the bottom of the container.

Thus, according to the known technique, both the hob and holder have a central opening of relatively big dimensions, passed through by the burner, providing in such zone an expansion vessel which is in turn covered by a lid provided with flame spreader grooves.

Hobs of the abovementioned type are already outdated, given that recessed hobs and generally hobs occupying less vertical space are used in modern cookers.

Therefore, burners provided with supply nozzles and small mixing chambers having throttles to exploit the Venturi principle to suction primary air depending on the conditions both above or beneath the hob and to mix it with the supplied gas.

Schematic examples of such embodiments according to the known technique are indicated in FIGS. 1 and 2, where the same elements are indicated with the same references.

FIG. 1 schematically illustrates a burner 1 with primary air suction A1 beneath the hob, while the burner 1′, illustrated in FIG. 2 provides for the suction of the primary air above the hob.

Both burners 1, 1′ according to the known technique comprise a body 2, a head 3, a nozzle 4 for gas supply G, a throttle or a horizontal Venturi pipe facing the nozzle for suctioning the primary air A1.

Provided in the head zone is a mixing chamber 6 having the flame spreaders 7 from which the mixture is released to be ignited and to mix with the secondary air A2.

Embodiments according the known technique are intended for burners with one or more flame crowns (usually circular) supplied by a single nozzle.

A drawback of such burners lies in the fact that regardless the presence of the horizontal Venturi pipe, suctioning and the subsequent mixing of primary air is limited, by the configuration of the burner, to a single pipe and to the corresponding mixing chamber hence the combustion cannot be complete and the burner cannot be efficient.

Another drawback can be observed in the poor possibility to distribute the flame properly upon variation of the maximum heating power desired in a burner. In burner configurations according to the known art the maximum power of the flame directly depends on the diameter of the burner. However, increasing such diameter implies varying the size of the hob increasing the production costs of the cooker.

Thus, the general objective of the present invention is that of overcoming the abovementioned drawbacks of the known art providing a modular burner with an optimised supply for a hob.

A particular objective of the present invention is that of providing a modular burner of an easily variable power depending on the use conditions.

In the light of the abovementioned objectives, according to the present invention, a modular burner with an optimised hob was conceived, having the characteristics outlined in the attached claims.

Structural and functional characteristics of the present invention as well as its advantages with respect to the known art shall be clearer and more evident from the observation of the following description, with reference to the attached drawings, which show a modular burner made according to the innovative principles of the invention itself.

IN THE DRAWINGS

FIGS. 1 and 2 are raised sectional schematic views of two burners according to the known art;

FIGS. 3a and 3b are perspective views, respectively seen from the top and from below, of the burner according to the invention;

FIG. 3c is a raised sectional view of a portion of a burner of FIGS. 3a,3b;

FIGS. 4a and 4b are perspective views respectively, seen from the top and from below, of a detail of the burner of FIGS. 3a,3b according to the invention;

FIGS. 4c-4e are respectively a plan view, alongside sectional front and side views of a detail of the burner of FIGS. 4a,4b according to the invention;

FIG. 5 is a raised sectional view of the burner of FIGS. 3a and 3b;

FIG. 6 is a perspective exploded view of the base of the burner according to the invention;

FIGS. 7 and 8 show a burner babe according to the invention in a perspective view, respectively seen from above and below;

FIG. 9 is an exploded perspective view of the burner according to the invention;

FIGS. 10a and 10b respectively show a plan and raised view of a burner according to the invention;

FIGS. 11a and 11b are perspective views, respectively seen from above and below, of a burner according to a different embodiment of the invention;

FIG. 11c is a raised sectional view of a portion of the burner of FIGS. 11a,11b;

FIGS. 12a and 12b are perspective views, respectively seen from above and below, of a detail of the burner of FIGS. 11a,11b;

FIGS. 12c-12e are respectively a plan view, alongside sectional front and side views of a detail of the burner of FIGS. 12a,12b;

FIGS. 13a and 13b are perspective views, respectively seen from above and below, of a burner according to a different embodiment of the invention;

FIG. 13c is a raised sectional view of a portion of the burner of FIGS. 13a,13b;

FIGS. 14a and 14b are perspective views, respectively seen from above and below, of a detail of the burner of FIGS. 13a,13b;

FIGS. 14c-14e are respectively a plan view, alongside sectional front and side views of a detail of the burner of FIGS. 14a,14b;

FIGS. 15a and 15b are perspective views, respectively seen from above and below, of a burner according to a different embodiment of the invention;

FIG. 15c is a raised sectional view of a portion of the burner of FIGS. 15a,15b;

FIG. 16 shows a plan view of the burner according to FIGS. 15a,15b;

FIGS. 17 and 18a,18b show a perspective view of the same number of details of the burner according to FIGS. 15a,15b;

FIG. 19 shows an exploded perspective view of the burner according to FIGS. 15a,15b;

FIGS. 20a and 20b show a perspective view, respectively seen from above and below, of the base of the burner according to FIGS. 15a,15b.

Referring to the figures, a modular burner 10 intended for a hob of a cooking appliance comprises a base body 20 in turn comprising a frame 22 exemplified in a non-limiting manner as quadrangular-shaped, a burner base 21 centrally mountable onto the frame 22, at least one lid, preferably an external lid 11 and an internal lid separated and respectively intended to close the frame 22 and the burner base 21 on the upper part.

The frame comprises four arms of which one to three of the support arms 23 and at least one burner arm 24 extend radially towards the centre of the same.

In the embodiment exemplified in FIGS. 3a-14e of the burner, provided are three support arms 23 projecting from the centre of three sides of the frame and a burner arm 24 projecting from the centre of the remaining side 22′. However, it should be observed that the number and the position of the same can be varied. The burner arm 24 is thus U-shaped and it is connected to a channel 29′ connected to a longitudinal recess 73 provided on the side 22′ of the frame 22.

The recess 73, closed on the upper part by the lid 11, is in turn connected to a distribution chamber 60 for supplying and distributing gas to the entire burner base 21, through at least one opening 71 provided with a throttle 72 passing through the bottom of the recess itself.

Furthermore, the burner arm 24 has flame spreader grooves 30 made along the edge of the flaps 35 of the U-shape to allow, along such section, lighting up of the flame.

Provided at the end facing inwards the frame of each support arm 23 is a seat 31 adapted to accommodate the corresponding ends of the burning base 21 and allow its fastening.

Given that it is required to allow the passage of gas along the channel 29′, the burner arm 24 is provided with a lower bracket 38 adapted to be connected to a corresponding lower abutment 37 extending from the burner base 21.

The burner base 21 is provided with radial channels 27 configured in such a manner to correspond to the arms 23,24 in such a manner to be supported by the latter and allow the circulation of the gas provided by the channel 29′.

The burner base 21 further comprises a crown 26 provided with a central opening 28 for aeration, with channels 27 extending radially from said crown.

Three of the channels 27 are each provided at their open ends with a bracket 32 intended for one of the three arms 23.

The fourth channel 27 is preset to be connected to the burner arm 24 and provides a lower abutment 37 for this purpose.

Both the crown 26 and the channels 27 are U-shaped with flaps 35 and a bottom 36.

The three channels 27 intended for connection with the three support arms 23 are further provided with a transverse septum 34 which closes the channel at its end to be inserted into the seat 31.

The fourth channel 27 intended to be connected with the burner arm 24 is U-shaped and provided with an open pipe 29, to be connected to the channel 29′ to allow gas delivery to the burner.

Provided along the edges of the flaps 35 are flame spreader grooves 30.

Preset for the closure of the pipes on the upper part are lids 11 and 12 seal fixed by means of screws. Provided on the upper part of such lids 11,12 are respectively first and second flaps 13 and 13′ for holding the cooking containers at a raised position with respect to the burner, the first flaps 13 are provided for extending from the external lid 11 while the second flaps extend from the internal lid 12 for holding smaller cooking containers.

The external lid 11 is thus provided corresponding to the frame 22.

The internal lid 12 is made corresponding to the burner base 21, in particular it comprises four plates 17 projecting radially from a central crown 16 configured in a manner such to correspond respectively to the radial channels 27 and to the crown 26 of the burner base.

The internal lid 12 is further provided with an opening corresponding to the aeration opening 28 of the burner base.

Fixed beneath the frame 22 is a holder 78 for collecting the drippings, provided with a perimeter fixing edge 78′, corresponding to the shape of the frame 22 and provided with an opening 79 extended along the side 22′ of the frame from which the burner arm 24 extends.

The quadrangular shape of the plate, preferably squared, allows manufacturing modular cookers made up of a limited number of different components, guaranteeing considerable saving in terms of production costs.

The distribution chamber 60 is made oblong-shaped in such a manner to substantially extend along the entire side 22′ of the frame 22 from which the burner arm 24 extends centrally.

The distribution chamber 60 thus comprises a tray 64 contoured by a perimeter edge 65 through which it is fixed beneath the frame 22 with the perimeter edge 78′of the holder 78 interposed at the opening 79 of such perimeter edge 78′.

The distribution chamber 60 is supplied through a main gas pipe 61 ending in at least one coupling 62 which is inserted into the tray 64.

In the exemplified embodiment the distribution chamber is supplied at three separate and equispaced supply positions, provided by means of inlet pipes 67 connected to three couplings 62 to each one of which a branching of the main gas pipe 61 is connected.

The inlet pipes 67 are provided inside the lugs 63 provided with reinforcement ribs 69 connected to the external of the distribution chamber 60 beneath the tray 64 and fixed to the perimeter edge 65 of the latter.

In proximity to the internal end, each inlet pipe is perpendicularly connected to a channel 68 which passes through the bottom of the tray 64 and it is preset to accommodate a nozzle 70.

Each of the three nozzles 70 faces the bottom of the frame 22 arranged over the tray 64 directly beneath the opening 71.

The opening 71 and the related throttle 72 ending up in the recess 73 in practice provide a Venturi pipe.

The side 22′ is provided on the lower part of the frame, along the entire length of the sides of the primary air delivery fittings 75 to allow suctioning through the depression caused by the gas emitted by the nozzle which passes through the Venturi pipe provided by the opening 71 with the related throttle 72 which ends up in the recess 73.

Such three nozzled distribution chamber is intended for high power burners to exploit the gas/air mixture to the maximum.

Depending on the number of nozzles provided it is possible to modify the suction mode of primary air through the delivery fittings 75 thus obtaining an increase of the gas/air mixture distribution to be conveyed to the burner.

The burner according to the invention is susceptible to advantageous construction variants.

Referring to FIGS. 11a-12e illustrated is a different embodiment in which the distribution chamber 160 is provided with a single central nozzle 70 supplied by the pipe 61 with a relative coupling 62 of the related inlet pipe 67.

Correspondingly provided is a single Venturi pipe defined by the opening 71, throttle 72 ending up in the recess 73, the other characteristics remaining substantially identical to the three nozzled embodiment.

Though maintaining the modular support dimensions of the plate identical, such embodiment is intended for low power flames.

According to a different embodiment illustrated in FIGS. 13a-14e a distribution chamber 260 has two nozzles 70 supplied by the pipe 61 with the related two fittings 62 each regarding the related inlet pipe 67. Correspondingly provided are two Venturi pipes each defined by the opening 71, throttle 72 ending up in the recess 73, the other characteristics remaining substantially identical to the three nozzled embodiment.

Though maintaining the modular support dimensions of the plate identical, such embodiment is intended for medium power flames.

Another different embodiment of the invention is illustrated in FIGS. 15a-20b and it is intended for high power flames.

In such embodiment, provided for are two distinct supplies 61 for two distribution chambers.

In the exemplified embodiment a first distribution chamber 260 provides for two nozzles and a second distribution chamber 60 provides for three nozzles, with the related characteristics described previously. The frame 22 is consequently provided with two sides 22′ departing from which are two burner arms 24 for a more substantial supply of air/gas mixture hence the square-shaped frame is provided with two support arms 23.

Consequently, the perimeter edge 78′ of the holder 78 is correspondingly provided with two openings 79 to allow the passage of gas from the two distribution chambers.

In the present embodiment, in order to obtain the highest flow rate of the fuel provided by the two distribution chambers, provided for is a double burner 100 with a low flame and a high flame.

The double burner 100 thus comprises the base body 20 which in turn comprises the frame 22 intended to surround a double crown burner, provided with a burner base 121 with an external crown 122 and an internal crown 123 connected.

Correspondingly, regarding the closure of the upper part alongside the lid 11 of the frame, provided is a lid 111 of the double crown burner in turn provided with an external crown 112 and an internal crown 113. Thus, the two burner arms 24 of the frame 22 supply a first channel 127′ and a second channel 127″ of the burner base.

The first channel 127′, connected to the three nozzled distribution chamber 60, feeds the external crown while the second channel 127″ connected to the two nozzled distribution chamber 260 feeds the internal crown. Provided between the two crowns are flow separator elements 128 to prevent preferential paths of the flows.

In such manner, it is possible to obtain a high gas flow rate maintaining the efficiency of the mixture and thus an intense combustion distributed on the two crowns.

Referring to the present description and the related figures, it is clear how a modular burner according to the invention is particularly useful and advantageous. Thus the objective outlined in the introduction of the description is attained.

Obviously, the shapes of the burner according to the invention may vary from the ones shown solely for exemplifying and non-limiting purposes in the drawings. Therefore, the scope of protection of the invention is delimited by the claims attached.