Multi injection dual ring gas burner for domestic gas cooking units

Abstract

The present disclosure is related to a dual ring gas burner wherein the outer ring includes multipoint injection with bottom breathing and the inner ring works with top breathing. Two flame rings are included along with burner ports on the caps. As a result, better heating distribution is achieved along with greater ease in cleaning and combined simmer functions with high ratings by having the outer ring gas flow not interfering with the inner ring.

Claims

1. A dual gas burner for a cooking hob having a cooktop panel, the dual gas burner comprising: an inner burner configured to receive gas from below the cooktop panel and combustible air from above the cooktop panel, the inner burner comprising a central burner cap having a plurality of gas ports configured to pass gas and combustible air, the central burner cap arranged on a crown inlet configured to cooperate with a mixing chamber so as to receive gas from the mixing chamber and combustible air from outside the mixing chamber below the central burner cap, wherein the mixing chamber is arranged below the cooktop panel and the crown inlet is arranged above the cooktop panel so as to define an opening through which the combustible air passes to the crown inlet; and an outer annular burner configured to receive gas and combustible air from below the cooktop panel.

2. The dual gas burner according to claim 1, wherein the central burner cap is further arranged on the crown inlet so as to define a gap between the central burner cap and the crown inlet configured to pass gas and combustible air defining a curtain flame.

3. The dual gas burner according to claim 1, wherein the outer annular burner comprises an outer annular burner cap defining a central opening for accommodating a central burner cap therein, the outer annular burner cap arranged to cooperate with a plurality of crown ports extending below the cooktop panel and configured to introduce a combination of gas and combustible air from below the outer annular burner cap.

4. The dual gas burner according to claim 3, wherein the plurality of crown ports comprise slopped surfaces configured and arranged to avoid turbulence of the gas and combustible air passing through the plurality of crown ports below the outer annular burner cap.

5. The dual gas burner according to claim 4, wherein the outer annular burner cap is further arranged on a crown so as to define a gap between the outer annular burner cap and the crown configured to pass gas and combustible air defining a curtain flame.

6. The dual gas burner according to claim 5, wherein the crown further comprises a radial spoke connection arranged between each of the crown ports and a central ring arranged to support the central burner cap.

7. The dual gas burner according to claim 1, further comprising a first gas inlet and a first connecting passage configured to deliver gas to the inner burner and a second gas inlet and a second passage configured to deliver gas to the outer annular burner, wherein the first gas inlet and the second gas inlet are configured to be at least one of individually of combined controlled so as to selective limit a supply of gas into at least one of the first gas inlet and the second gas inlet.

8. The dual gas burner according to claim 7, further comprising a plurality of nozzles arranged in connection with the second passage such that gas flows into at least one of the plurality of nozzles from the second passage, and wherein one of the plurality of nozzles is arranged adjacent a crown port such that a jet of gas exiting the one of the plurality of nozzles enters the crown port drawing with it air by virtue of a Venturi effect.

9. The dual gas burner according to claim 1, further comprising: a spark igniter arranged to ignite gas and combustible air being introduced under a central burner cap; and a flame passage configured to pass a flame and arranged to ignite gas and combustible air being introduced under an outer annular burner cap with the flame.

10. A dual gas burner for a gas cooking hob having a cooktop surface, the dual gas burner having an inner burner arranged within an outer annular burner, and the dual gas burner comprising: a burner body arranged below the cooktop surface, the burner body comprising a mixing chamber arranged to be supplied with gas from a first gas inlet and a plurality of burner body inlets to be supplied with gas from a second gas inlet, a crown arranged above the cooktop surface, the crown comprising a crown inlet extending in a downward direction and arranged to cooperate with the mixing chamber so as to receive gas from the mixing chamber, and a plurality of ports extending in a downward direction and arranged to cooperate with the plurality of burner body inlets so as to receive gas from the plurality of burner body inlets; a central burner cap having a plurality of gas ports and arranged atop the crown inlet; an outer annular burner cap defining an internal opening for accommodating the central burner cap therein and arranged atop and circumferentially about the crown; and wherein the crown inlet is further arranged to receive combustible air from outside the mixing chamber and above the cooktop surface, and the plurality of ports are arranged to receive combustible air from below the cooktop surface, wherein the combustible air for the inner burner is drawn from a location isolated from where the combustible air for the outer annular burner is drawn.

11. The dual gas burner according to claim 10, wherein: the central burner cap further comprises a plurality of gas ports configured to pass gas and combustible air, the central burner cap further arranged on the crown inlet configured to cooperate with the mixing chamber so as to receive gas from the mixing chamber and combustible air from outside the mixing chamber below the central burner cap; and the central burner cap is further arranged on the crown inlet so as to define a gap between the central burner cap and the crown configured to pass gas and combustible air defining a curtain flame.

12. The dual gas burner according to claim 10, wherein: the mixing chamber is arranged below the cooktop surface; and the crown is arranged above the cooktop surface so as to define an opening through which the combustible air passes to the crown inlet.

13. The dual gas burner according to claim 10, wherein: the outer annular burner cap is configured to pass gas and combustible air, the outer annular burner cap arranged to cooperate with the plurality of ports extending below the cooktop surface and configured to introduce a combination of gas and combustible air below the outer annular burner cap.

14. The dual gas burner according to claim 13, wherein the plurality of ports comprise slopped surfaces arranged to avoid turbulence of the gas and combustible air passing through the ports below the outer annular burner cap.

15. The dual gas burner according to claim 14, wherein the outer annular burner cap is further arranged on the crown so as to define a gap between the outer annular burner cap and the crown configured to pass gas and combustible air defining a curtain flame.

16. The dual gas burner according to claim 15, wherein the crown further comprises a radial spoke connection arranged between each of the plurality of ports and a central ring arranged to support the central burner cap.

17. The dual gas burner according to claim 16, further comprising: a first gas inlet, a first connecting passage configured to deliver gas to the crown inlet, a second gas inlet, and a second passage configured to deliver gas to the plurality of ports, and wherein the first gas inlet and the second gas inlet are individually controlled so as to selectively limit a supply of gas into the first gas inlet and the second gas inlet.

18. The dual gas burner according to claim 17, further comprising: a plurality of nozzles arranged in connection with the second passage such that gas flows into the plurality of nozzles from the second passage, and wherein one of the plurality of nozzles is arranged adjacent one of the ports such that a jet of gas exiting the one of the plurality of nozzles enters the port drawing with it air by virtue of a Venturi effect; a spark igniter arranged to ignite gas and combustible air being introduced under the central burner cap; and a flame passage configured to pass a flame and arranged to ignite gas and combustible air being introduced under the outer annular burner cap with the flame.

Description

(1) In the following, advantageous examples of the invention are explained with reference to the accompanying figures, wherein:

(2) FIG. 1 depicts an exploded view of a gas burner assembly;

(3) FIG. 2 depicts a side section view of the fully assembled gas burner assembly taken through a first gas inlet port;

(4) FIG. 3 depicts a perspective view, partially in section through a nozzle for an outer burner ring;

(5) FIG. 4 depicts a top perspective view of a crown of the gas burner assembly; and

(6) FIG. 5 depicts a bottom perspective view of the crown

DETAILED DESCRIPTION OF THE INVENTION

(7) As used throughout the present disclosure, unless specifically stated otherwise, the term or encompasses all possible combinations, except where infeasible. For example, the expression A or B shall mean A alone, B alone, or A and B together. If it is stated that a component includes A, B, or C, then, unless specifically stated otherwise or infeasible, the component may include A, or B, or C, or A and B, or A and C, or B and C, or A and B and C. Expressions such as at least one of do not necessarily modify an entirety of the following list and do not necessarily modify each member of the list, such that at least one of A, B, and C should be understood as including only one of A, only one of B, only one of C, or any combination of A, B, and C.

(8) Referring to FIG. 1, the gas burner includes a center burner cap 10, an outer annular burner cap 30, a burner body 50 and a crown 100. When the gas burner is assembled the crown 100 rests on the burner body 50 and the center burner cap 10 and the outer burner cap 30 both rest on the crown 100. The center burner cap 10 and the outer burner cap 30 both include a plurality circular gas ports 12, 32, respectively.

(9) The burner body 50 includes a first gas inlet 52 and a second gas inlet 58. The first gas inlet 52 extends horizontally toward a mid-portion of the burner body 50 for supplying gas to the center cap 10. Referring to FIG. 2, the first gas inlet 52 connects to a mixing chamber 54. A nozzle 56 is disposed in a bottom of the mixing chamber 54 for directing the gas in an upward direction into the crown 100. As the gas exits the nozzle 56 it draws combustion air via a Venturi effect through a circumferential opening 80 between a bottom of the crown 100 and a top of the cooking panel 15. The air/fuel mixture is then conveyed through a first inlet 132 of the crown 100 into a central chamber 102 defined between the center burner cap 10 and a central portion 120 of the crown 100. As illustrated in FIG. 2, the first inlet 132 in the central portion 120 of the crown 100 is offset from a center of the crown 100. The air/fuel mixture may exit the central chamber 102 through the gas ports 12 formed in the inner burner cap 10.

(10) A terminal peripheral edge 10a of the inner burner cap 10 is spaced above central portion 120 of the crown 100 by a plurality of spaced-apart standoffs 142 (FIG. 4). The space between the terminal edge 10a and the central portion of the crown 100 is dimensioned to form a combustion-gas exit port that extends circumferentially about the base of the inner burner cap 10 to produce a circumferential curtain flame that extends about its circumference, including between adjacent circular burner ports 12. This curtain flame is in addition to the main flames that exit from the gas ports 12. The curtain flame is a carry-over flame that connects or joins adjacent main flames. The curtain flame helps in re-igniting the main flames during accidental blow-out. Tabs 143 are provided for positioning the inner burner cap 10 on the central portion of the crown 100.

(11) Referring to FIG. 1, the burner body 50 includes a lower body 60 and an upper body 70. The first gas inlet 52 and the second gas inlet 58 are formed in the lower body 60. The lower body 60 includes internal passages (not shown) for connecting the second gas inlet 58 to three nozzles 62 (two nozzles 62 are shown in FIG. 1). Referring to FIG. 3, the three nozzles 62 are positioned below the cooktop panel 15 and create jets of high pressure gas that are directed toward inlets 72 in the upper body 70. The inlets 72 extend through one or more openings formed in the cooktop panel 15 and the ports 104 of the crown 100 rest on the inlets 72 of the burner body 50. As the jets of high pressure gas pass through the inlets 72, combustion air is drawn from below the cooktop panel by the gas (via a venturi effect). The air/fuel mixture passes through the inlets 72 and ports 104 of an outer ring 110 of the crown 100 that are disposed in the inlets 72.

(12) After passing through the ports 104, the air/fuel mixture enters an outer chamber 106 formed between the outer ring 110 and the outer burner cap 30. A sloped surface 105 is formed around the outlets of the ports 104. The sloped surface 105 is configured to reduce the turbulence of the air/fuel mixture as it flows into the outer chamber 106. The air/fuel mixture may exit the outer chamber 106 through the gas ports 32 formed in the outer burner cap 30. In addition, an outer peripheral terminal edge 30a of the outer burner cap 30 rests on a plurality of spaced-apart standoffs 122 (FIG. 4) for spacing the outer peripheral terminal edge 30a of the outer burner cap 30 above the outer ring 110. The air/fuel mixture in the outer chamber 106 may exit through this space to define a connecting or curtain flame between adjacent circular burner ports 32. This curtain flame functions in the same manner as the curtain flame for the inner burner cap 10 i.e., to connect or join adjacent main flames and help re-ignite the main flames during accidental blow-out. Tabs 123 are provided for positioning the outer burner cap 30 on the outer ring 110 of the crown 100.

(13) Referring to FIG. 4, the outer ring 110 and the central portion 120 are connected by a plurality of spokes 108 (see also FIG. 5). The upper surface of the central portion 120 includes a raised annular band 124, an opening 126 for a spark ignitor 140 (FIG. 2) and an outer perimeter flange 128. The central portion 120 also includes a stability chamber 129. A slot 124a is formed in the raised annular band 124 for directing the air/fuel mixture toward the opening 126 for the spark ignitor 140 (FIG. 2).

(14) Similar to the central portion 120, the outer ring 110 also includes a raised annular band 114 and an outer perimeter flange 118. The outer ring 110 also includes a passage 150 for allowing a flame from the central portion 120 to ignite the air/fuel mixture exiting the gas ports 32 on the outer burner cap 30. In this manner, the flames generated by the inner burner are used to ignite the air/fuel mixture of the outer burner. An opening 150a extends through the bottom wall of the outer ring 110 below the passage 150. The opening 150a is provided to allow a consistent flow of air into the passage 150 so that the transfer flame between in inner burner and the outer burner stays ignited. The opening 150a also allows the burner assembly to operate at low flame conditions without generating a popping sound. The popping sound is considered to be caused by the sudden ignition of the air/fuel mixture in the passage 150 during low flame conditions.

(15) Referring to FIG. 5, the three ports 104 extend from the bottom of the crown 100 and are located and dimensioned to be positioned in the three ports 72 of the burner body 50. The first inlet 132 of the crown 100 is located and dimensioned to be positioned in the mixing chamber 54 of the burner body 50.

(16) Concerning operation of the gas burner assembly, after the fuel gas has passed into burner assembly through the first gas inlet 52 and the second gas inlet 58, it is mixed with induction air and the mixture fills the chambers 102, 106 under the respective inner burner cap 10 and outer burner cap 30. The air/fuel mixture exits through the respective circular burner ports 12, 32 and through the gaps under the terminal edges 10a, 30a of the inner burner cap 10 and the outer burner cap 30. The air/fuel mixture exiting the inner burner cap 10 near the spark ignitor 140 is ignited to create flames at the circular burner ports 12 and under the outer peripheral edge 10a. The flame exiting the inner burner cap 10 passes through the passage 150 formed in the outer ring 110 to ignite the air/fuel mixture exiting the burner ports 32 and under the outer peripheral terminal edge 30a of the outer burner cap 30.

(17) Because the gas burner assembly includes a first gas inlet 52 and a second gas inlet 58 to supply combustion gas independently to the respective first and second chambers 102, 106, it is contemplated that the intensity of the flames exiting the inner burner cap 10 and the outer burner cap 30 can be separately controlled. In the embodiment shown, there is a single spark ignitor 140 that ignites only the air/fuel mixture from the inner burner cap 10.

(18) In the present gas burner assembly, combustion air for the inner burner comes from above a cooktop and air for the outer burner comes from below the cooktop. In this respect, the gas burner assembly is a combined top-breather and bottom-breather burner.

(19) Since the devices and processes described in detail above are exemplary embodiments, they can be modified to a large extent in the usual way by a person skilled in the art without leaving the field of the invention. In particular, the mechanical arrangements and the proportions of the individual elements to each other are simply exemplary. Having described some aspects of the present disclosure in detail, it will be apparent that further modifications and variations are possible without departing from the scope of the disclosure. All matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.