Radiant Panel Burner
A radiant panel burner is provided having a primary heat emitter and a secondary heat emitter. The radiant panel includes a plenum chamber that houses a baffle connected to a mixer that supplies combustible gas. In a preferred embodiment, the primary heat emitter is a perforated ceramic grid positioned over the plenum chamber and having a plurality of ports through which the combustible gas can travel. The secondary heat emitter is a non-planar radiant panel positioned over the primary heat emitter that generates convective and radiant heat. The non-planar shape of the secondary heat emitter provides more uniform heating and reduces accumulation of cooking by-products. The radiant panel protects the primary heat emitter from contaminants and provides enclosure for the combustion area for more rapid and efficient heating. Together, the primary and secondary heat emitters are configured to provide fast, clean, efficient, and uniform heating within a grilling apparatus.
The present invention relates to burner devices used in food grilling, particularly infrared burners.
BACKGROUND OF THE INVENTIONThe trend in barbecuing is to use high intensity infrared heat for searing of meats. However, conventional infrared sear burners used in grilling and barbecuing have several disadvantages. Though infrared burners provided very intense heat, they cover only a limited area and are susceptible to contamination from grease and other food products, flare-ups, and non-uniform heating. The heat is often non-uniformly distributed. There is a need for a more robust and efficient burner to provide uniform, high intensity heat over a broader area of the cooking surface.
SUMMARY OF THE INVENTIONThe present invention provides an improved high intensity under-fired infrared sear burner for grilling meats and other suitable foods. A radiant panel burner is provided having a primary heat emitter and a secondary heat emitter. The radiant panel includes a plenum chamber that houses a baffle connected to a mixer that supplies combustible gas. In a preferred embodiment, the primary heat emitter is a perforated ceramic grid positioned over the plenum chamber and having a plurality of ports through which the combustible gas can travel. The secondary heat emitter is a non-planar radiant panel positioned over the primary heat emitter that generates convective and radiant heat. The non-planar shape of the secondary heat emitter provides more uniform heating and reduces accumulation of cooking by-products. The radiant panel protects the primary heat emitter from contaminants, provides enclosure for the combustion area for more rapid and efficient heating, and returns radiant heat back to the primary heat emitter for faster heat-up and efficiency. Together, the primary and secondary heat emitters are configured to provide fast, clean, efficient, and uniform heating as compared to conventional infrared sear burner designs.
In the following discussion, numerous specific details are set forth to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without such specific details. In other instances, well-known elements, processes or techniques have been briefly mentioned and not elaborated on in order not to obscure the present invention in unnecessary detail and description. Moreover, specific details and the like may have been omitted inasmuch as such details are not deemed necessary to obtain a complete understanding of the invention, and are considered to be within the understanding of persons having ordinary skill in the relevant art.
The radiant panel 140 is preferably composed of a durable metal such as steel or ceramic that can withstand high temperatures without distortion or corrosion. Its length portions are open below the panel, while its width portions possess supporting extensions 141 that extend perpendicularly outward from the sides of the panel 140, making contact with two of four perimeter extensions 139. Said supporting extensions 139 extend perpendicularly outward from the vertical sides of the plenum chamber 130 and support the weight of the radiant panel 140. In a heating capacity, the radiant panel 140 evenly distributes combustive gases, acts as a radiant emitter to provide high quality radiant heat to the cooking surface, distributes convective heat, and returns a portion of heat energy back to the ceramic emitter for fast heat-up and efficiency. Additionally, the radiant panel 140 protects the ports 136 of the grid 135 from cooking matter that inevitably falls from a cooking surface above (e.g. grill surface). The resulting burner system provides a very controlled, high temperature, high efficiency heat propagation that is also very durable under intense cooking conditions.
Burner operation begins with natural or propane gas passing through a mixer, where it is combined with 100% of the air required for combustion. An internal baffle (see baffle 231 of
Meanwhile, a portion of the radiant heat propagated within the space between ceramic grid 335 and panel 340 is returned to the grid 335, for additional heating of the ceramic element. Downward motion arrows 302 indicate this quantity of returned radiant heat, which is directed at and absorbed by the ceramic grid 335. As such, this radiant heat energy 302 is not wasted, but rather, transferred to the ceramic grid 335, which in turn becomes further heated. This provides conservation of heat 302 provides added efficiency not found in conventional burners. Accompanying these quantities of radiant heat is a portion of convective heat pushed through the open length portions of the radiant panel 340 and upward to a grilling surface. Curved motion arrows 303 indicate convectively propagated heat flowing upward and outward out from beneath the radiant panel 340. As shown, radiant panel 340 is not flat or planar, but rather, slightly angled and slopes downward from its center toward its terminal lengthwise edges. Its top surface is thus slightly raised along a line parallel to the length axis of the burner 310. The angled sections of the radiant panel 340 terminate in downward projections 350. Thus, this cross-sectional view across the width of the secondary heat emitter shows a symmetric surface that slopes downward from the centerline (which coincides with the “340” label) of the radiant panel to its perimeter edge and then terminates in a vertical or nearly vertical downward projection. These downward projections help protect the combustion/ignition area (air gap) from the wind and contaminants, and isolates this area to promote faster and more efficient heating.
The slight angle in the shape of the radiant panel 340, which may ideally be in the range of 3-6 degrees, provides many advantages. First, the shape helps the panel maintain its shape at high temperatures. Further, the angled shape has the effect of spreading out the radiant heat over a broader area, thus promoting a uniform temperature distribution. The angled shape also prevents oils, fats, and other cooking by-products from accumulating on the radiant panel 340. Thus, the non-flat, convex shape of the radiant panel 340 provides numerous performance advantages. Alternatively, the slope of the radiant panel may be curved (i.e. curved convex surface) rather than linear (i.e. linear convex surface). Thus, as used herein, the term “convex” refers to a slight protrusion or bulge in the upward direction (towards the grilling surface above and away from the plenum chamber) irrespective of whether the bulge is in the form of a linear or curved surface.
Unlike conventional infrared burners, the flame is effectively enclosed, which provides numerous advantages as well. First, the radiant panel enhances the performance of the infrared burner by reflecting part of the radiant energy back to the surface of the primary emitter (i.e. perforated ceramic grid 335). This allows the burner to heat more rapidly and increases the temperature of the primary emitter for more efficiency. By distributing the combustion gases out the side of the burner, heat is better distributed across the surface of the cooking surface or grille. Moreover, because the radiant panel 340 covers the primary emitter (i.e. perforated ceramic grid 335), it protects the primary emitter from fat, grease and other cooking by-products that may fall through the grille and would otherwise fall onto the primary emitter below and cause blockage of the ports in the perforated ceramic grid which would decrease efficiency. The radiant panel 340 also protects the burner from wind and drafts that would prevent the burner from working efficiently. Finally the radiant panel 340 provides a smooth cleanable surface that is not affected by harsh chemicals such as oven cleaners.
While there have been described herein what are considered to be preferred and exemplary embodiments of the present invention, other modifications of the invention shall be apparent to those skilled in the art from the teachings herein. It is noted that the embodiments disclosed are illustrative rather than limiting in nature and that a wide range of variations, modifications, changes, substitutions arc contemplated in the foregoing disclosure and, in some instances, some features of the present invention may be employed without a corresponding use of other features. Many such variations and modifications may be considered desirable by those skilled in the art based upon a review of the foregoing description of preferred embodiments. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.
Claims
1. A radiant panel burner, comprising:
- a plenum chamber;
- a baffle housed within the plenum chamber;
- a mixer connected with the plenum chamber and configured to channel a combustible gas into the baffle and the plenum chamber, wherein the mixer further comprises an adapter for connection to a gas source;
- a primary heat emitter positioned over the plenum chamber, the primary heat emitter having a plurality of ports through which the combustible gas can travel; and
- a secondary heat emitter positioned over the primary heat emitter, the secondary heat emitter having a non-planar shape, wherein a cross-section across the width of the secondary heat emitter shows a symmetric surface in that slopes downward from a centerline to a perimeter edge that terminates in downward projections;
- wherein the primary heat emitter and secondary heat emitter are separated by an air gap in which ignition and combustion of the gas occur;
- wherein the downward projections enclose a portion of the air gap; and
- wherein convective heat is generated from beneath the secondary heat emitter and radiant heat is emitted from the secondary heat emitted.
2. The radiant panel burner of claim 1 wherein the primary heat emitter comprises a perforated ceramic grid.
3. The radiant panel burner of claim 1 wherein the secondary heat emitter comprises a radiant panel having a curved convex surface.
4. The radiant panel burner of claim 1 wherein the secondary heat emitter comprises a radiant panel having a linear convex surface.
5. The radiant panel burner of claim 1 wherein the combustible gas is ignited on a top surface of the primary heat emitter.
6. The radiant panel burner of claim 1 wherein the secondary heat emitter further comprises two supporting projections that rest on the plenum chamber.
7. The radiant panel burner of claim 1 wherein the secondary heat emitter returns radiant heat to the primary heat emitter to provide more efficient and rapid heating.
8. The radiant panel burner of claim 1 wherein the primary heat emitter and secondary heat emitter are configured such that the secondary heat emitter protects the primary heat emitter from any cooking by-products or contaminants falling from a grilling surface above.
9. The radiant panel burner of claim 1 wherein the secondary heat emitter has a slope in the range of 3 to 6 degrees.
10. A radiant panel burner, comprising:
- a plenum chamber;
- a baffle housed within the plenum chamber;
- a mixer connected with the plenum chamber and configured to channel a combustible gas into the baffle and the plenum chamber, wherein the mixer further comprises an adapter connection to a gas source;
- a perforated ceramic grid positioned over the plenum chamber, the perforated ceramic grid having a plurality of ports through which the combustible gas can travel;
- a radiant panel positioned over the perforated ceramic grid, the radiant panel having a non-planar shape wherein a cross-section across the width of the radiant panel shows a symmetric surface that slopes downward from a centerline to a perimeter edge that terminates in downward projections;
- wherein the perforated ceramic grid and radiant panel are separated by an air gap in which ignition and combustion of the gas occur;
- wherein the downward projections enclose a portion of the air gap; and
- wherein convective heat is emitted from beneath the radiant panel and radiant heat is emitted from the radiant panel.
11. The radiant panel burner of claim 8 wherein the secondary heat emitter comprises a radiant panel having a curved convex surface.
12. The radiant panel burner of claim 8 wherein the secondary heat emitter comprises a radiant panel having a linear convex surface.
13. The radiant panel burner of claim 8 wherein the combustible gas is ignited on a top surface of the perforated ceramic grid.
14. The radiant panel burner of claim 8 wherein the radiant panel further comprises two supporting projections that rest on the plenum chamber.
15. The radiant panel burner of claim 1 wherein the secondary heat emitter returns radiant heat to the primary heat emitter to provide more efficient and rapid heating.
16. The radiant panel burner of claim 1 wherein the perforated ceramic grid and radiant panel are configured such that the perforated ceramic grid protects the radiant panel from any cooking by-products or contaminants falling from a grilling surface above.
17. The radiant panel burner of claim 1 wherein the radiant panel has a slope in the range of 3 to 6 degrees.
Type: Application
Filed: Sep 8, 2015
Publication Date: Mar 9, 2017
Inventor: Robert L. Cowan (Orange, CA)
Application Number: 14/848,004