WO1999008048A1 - Burner for a cooking apparatus - Google Patents

Burner for a cooking apparatus Download PDF

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Publication number
WO1999008048A1
WO1999008048A1 PCT/CA1998/000761 CA9800761W WO9908048A1 WO 1999008048 A1 WO1999008048 A1 WO 1999008048A1 CA 9800761 W CA9800761 W CA 9800761W WO 9908048 A1 WO9908048 A1 WO 9908048A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
burner
diffuser plate
chamber
anyone
Prior art date
Application number
PCT/CA1998/000761
Other languages
French (fr)
Inventor
Jean-Pierre Patenaude
Original Assignee
Woodflame Inc.
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 Woodflame Inc. filed Critical Woodflame Inc.
Priority to AU87247/98A priority Critical patent/AU8724798A/en
Priority to CA002299251A priority patent/CA2299251A1/en
Publication of WO1999008048A1 publication Critical patent/WO1999008048A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/06—Roasters; Grills; Sandwich grills
    • A47J37/07—Roasting devices for outdoor use; Barbecues
    • A47J37/0754—Roasting devices for outdoor use; Barbecues with blowers providing forced air circulation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/06—Roasters; Grills; Sandwich grills
    • A47J37/07—Roasting devices for outdoor use; Barbecues
    • A47J37/0704—Roasting devices for outdoor use; Barbecues with horizontal fire box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B1/00—Combustion apparatus using only lump fuel
    • F23B1/30—Combustion apparatus using only lump fuel characterised by the form of combustion chamber
    • F23B1/36—Combustion apparatus using only lump fuel characterised by the form of combustion chamber shaft-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F23L1/02—Passages or apertures for delivering primary air for combustion  by discharging the air below the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00018—Means for protecting parts of the burner, e.g. ceramic lining outside of the flame tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/26—Biowaste
    • F23G2209/261—Woodwaste

Definitions

  • This invention relates to a burner for the combustion of fuels such as wood, coal, oil, etc. and more particularly to a solid fuel burner which results in a highly efficient conversion to usable energy while minimizing unburned, pollution producing by-products.
  • the present invention relates to a new improved combustion system that provides dynamic combustion at low air pressure.
  • a prior art diffuser (100) and burner (102) for a combustion system as described in US patent no. 4,924,847 and 4,747,781 is illustrated.
  • the diffuser (100) includes a diffuser plate (104), a lower plate (106) and side walls (108), the combination forming a type of manifold.
  • the diffuser plate (104) is provided with a plurality of small openings (110)).
  • the bottom of the diffuser (100) is fitted with a conduit (112) thereby creating a type of manifold having an input by means of the conduit (112) and an output through openings (110) in the diffuser (100).
  • the opposite end of the conduit (112) is connected to a source of air such as an air pump (114).
  • a source of fuel such as a piece of wood or coal is placed on the surface of the diffuser plate (104) in the combustion chamber (116) of the burner (102). Ignition of the wood is initiated by igniting a suitably positioned supply of paper or other readily combustible material.
  • biofuel is becoming again a very interesting fuel as it is not only renewable, the time to produce fuel being from a few months to a few years, but unlike fossil fuel, where fuel has been accumulated through time, it does not and will not create that environment and climatic instability created by the use of fossil fuel. It is with that spirit in mind that this invention is presented.
  • the present system is specially adapted to burn chunks or pieces of wood or similar byproducts of the biofuel family.
  • An object of the present invention is to propose an improved burner that provides dynamic combustion at low pressure and therefore consumes less energy than prior art burners .
  • a burner comprising a combustion chamber bottomed with a diffuser plate, the diffuser plate having an upper surface adapted to support a source of f el , a lower surface and spaced-apart openings therethrough.
  • the burner further comprises an air-receiving chamber in fluid communication with the combustion chamber via the diffuser plate, the air-receiving chamber having an air inlet for connection to an air pump means for forcing air through the openings of the diffuser plate so as to cause the air to exit on the upper surface thereof in the form of small jets of a given velocity.
  • the burner is characterized in that it further comprises a dynamic air chamber topped with the diffuser plate, the dynamic air chamber having a bottom wall provided with a funnel-shaped inlet in communication with the air-receiving chamber for receiving an air flow of a given velocity from the air-receiving chamber and increasing said velocity to thereby create an air turbulence zone below the diffuser plate.
  • the present invention also relates to a cooking apparatus comprising a burner as described hereinbefore, a grill assembly mountable above the burner and a support to support the grill assembly above the burner.
  • Figure 1 is a cross-sectional side elevational view of a cooking apparatus including a burner according to a preferred embodiment of the present invention.
  • Figure 2 is a cross-sectional front elevational view of the cooking apparatus of figure 1.
  • Figure 3 is a perspective view of the burner of figure 1.
  • Figure 4 is an exploded side elevational view of the burner of figure 1.
  • Figure 5 is a cross-sectional view of another version of a dynamic air chamber which may be set under the diffuser plate of the burner of figure 1.
  • FIG. 6 is a cross-sectional side elevational view of a prior art burner of a combustion system.
  • the cooking apparatus (10) such as a portable stove including a preferred embodiment of a burner (14) according to the present invention is illustrated.
  • the cooking apparatus (10) in a general manner comprises a grill assembly (12) with handles (52), a tubular burner (14) and a support to mount the grill assembly (12) over the burner (14).
  • the support preferably consists of an open container (16) adapted to receive therein the burner (14) in an upright position.
  • the container (16) has sidewalls (18) each having an upper edge (20) adapted to receive and support a corresponding outer edge (22) of the grill assembly (12) such that the grill (12) is mountable over the burner (14) which is enclosed in the container (16). More particularly, the upper edge (20) of each of the sidewalls (18) defines an L-shaped shoulder on which a corresponding outer edge (22) of the grill (12) is resting.
  • the burner (14) is made of a heat-resistant material preferably stainless steel.
  • the burner (14) comprises a combustion chamber (60) bottomed with a diffuser plate (62).
  • the combustion chamber (60) preferably has a cylindrical side wall (61).
  • the diffuser plate (62) has an upper surface adapted to support a source of fuel , a lower surface and spaced-apart openings (68) through the diffuser plate (62) which preferably define a latticed pattern of openings, as best seen from figure 3.
  • the source of fuel is preferably wood.
  • An air-receiving chamber (70) is in fluid communication with the combustion chamber (60) via the diffuser plate (62).
  • the air-receiving chamber (70) is fitted with a conduit (72) thereby creating a type of manifold having an inlet by means of the conduit (72) and an output through openings (68) in the diffuser plate (62).
  • the opposite end of the conduit (72) is devised to be connected to a source of air such as an air pump (74) for forcing air through the openings (68) of the diffuser plate (62) so as to cause the air to exit on the upper surface thereof in the form of small jets, represented with arrows, of a given velocity.
  • the burner (14) may comprise a shield (69) surrounding the side wall (61) of the combustion chamber (60). Also preferably, the combustion chamber (60) has an upper edge provided with a restrictive collar (71).
  • the diameter of the collar (71) is directly related to the dimension of the diffuser plate (62) (or to the dimension and quantity of the openings (68) of the diffuser plate (62) and the quantity of air supplied by the pump (74) through the diffuser plate (62) at near maximum speed).
  • the collar (71) provides a positive pressure inside the combustion chamber (60) to ensure that external air does not recirculate inside the combustion chamber (60). It also limits the dimension of the piece of wood to be inserted in the combustion chamber (60).
  • (70) of the preferred embodiment illustrated has a bottom wall
  • the burner (14) is characterized in that it further comprises a dynamic air chamber (80) topped with the diffuser plate (62).
  • the bottom wall (82) of the dynamic air chamber (80) comprises a rimmed aperture (84) which is adapted to be sealingly connected with an uppermost protruding portion (86) of the dome-shaped member (7-9) which is provided with a hole.
  • the dome- shaped member (79) as it is connected with the rimmed aperture (84) of the dynamic air chamber (80) defines a funnel-shaped inlet for the dynamic air chamber (80) in communication with the air-receiving chamber (70) for receiving an air flow of a given velocity from the air-receiving chamber (70) and increasing said velocity to thereby create an air turbulence zone below the diffuser plate (62). Therefore, the dynamic air chamber (80) provides dynamic combustion, even with a lower pressure from the air pump (74).
  • the diffuser plate (62) and the bottom wall (82) of the dynamic air chamber (80) are preferably concave.
  • the source of fuel such as a piece of wood or coal is placed on the surface of the diffuser plate (62) in the combustion chamber (60) of the burner (14). Ignition of the wood is initiated by igniting a suitably positioned supply of paper or other readily combustible material. After ignition, temperature is established, the air pump (74) is turned on, and an air flow is forced through the conduit (72) into the air- receiving chamber (70), accelerated by passing through the air- funnel-shaped inlet and out through the openings (68) in the diffuser plate (62). Combustion of the wood follows virtually instantaneously and is prompted by the jets of air, with identified arrows, exiting through openings (68) in the diffuser plate (62).
  • air under pressure in the prior art manifold provides a steady, smooth and fast moving air flow represented by dots
  • air under pressure with the funnel-shaped air inlet of the dynamic air chamber (80) provides a turbulent fast moving air flow.
  • the dynamic air chamber adds movement or turbulence to the steady, smooth and fast moving air flow of the prior art manifold.
  • the distance of the funnel-shaped air inlet, which is actually the hole in the dome-shaped member (79), and the diffuser plate (62) is between point five cm (,5 cm) to two point five cm (2,5 cm) with a preferred point nine five cm ( ,95 cm).
  • the diameter of the hole (86) of the funnel is between one cm (1 cm) and three cm (3 cm).
  • FIG. 5 another version of a dynamic air chamber (80) according to the invention and which may be set under the diffuser plate (62) of a burner (14) is illustrated.
  • the funnel-shaped inlet (88) is formed in the rimmed aperture (84) of the bottom wall (82) of the chamber (80).
  • This funnel-shaped air inlet (88) provides three different seatings for the air-receiving chamber (not illustrated): first (indicated as "a") on the perimeter of the bottom wall (82), second (indicated as "b” ) on the perimeter of the rimmed aperture (84) and third (indicated as "c") inside the funnel.
  • the angle C is between 35 9 and 85 s but preferably 75 s to 80 B .
  • the angle ⁇ provides a long smooth flow of air.
  • the funnel-shaped air inlet (88) allows, when used with a large conduit, a sharp low profile.
  • this preferred embodiment of a dynamic air chamber according to the present invention may advantageously be installed under the diffuser plate (104) of the cooking apparatus illustrated in figure 6.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)

Abstract

The burner (14) for a cooking apparatus (10) comprises a combustion chamber (60) bottomed with a diffuser plate (62), the diffuser plate (62) having openings (68) therethrough. An air-receiving chamber (70) in fluid communication with the combustion chamber (60) via the diffuser plate (62) is provided. The air-receiving chamber (70) has an air inlet (72) for connection with an air pump means (74) for forcing air through the openings (68) of the diffuser plate (62) so as to cause the air to exit on the upper surface thereof in the form of small jets of a given velocity. The burner (14) is characterized in that it further comprises a dynamic air chamber (80) topped with the diffuser plate (62). The dynamic air chamber (80) has a bottom wall (82) provided with a funnel-shaped inlet (79) in communication with the air-receiving chamber (70) for receiving an air flow of a given velocity from the air-receiving chamber (70) and increasing said velocity to thereby create an air turbulence zone below the diffuser plate (62). The burner (14) provides dynamic combustion at low pressure and therefore consumes less energy than prior art burners.

Description

BURNER FOR A COOKING APPARATUS
FIELD OF THE INVENTION
This invention relates to a burner for the combustion of fuels such as wood, coal, oil, etc. and more particularly to a solid fuel burner which results in a highly efficient conversion to usable energy while minimizing unburned, pollution producing by-products.
BACKGROUND OF THE INVENTION
In reference to the applicant's previous US patents No. 4,924,847 and 4,747,781 describing a combustion system for initiating and promoting combustion where combustion was achieved with air under pressure through openings in a diffuser plate, the present invention relates to a new improved combustion system that provides dynamic combustion at low air pressure. Referring to figure 6, a prior art diffuser (100) and burner (102) for a combustion system as described in US patent no. 4,924,847 and 4,747,781 is illustrated. The diffuser (100) includes a diffuser plate (104), a lower plate (106) and side walls (108), the combination forming a type of manifold. The diffuser plate (104) is provided with a plurality of small openings (110)). The bottom of the diffuser (100) is fitted with a conduit (112) thereby creating a type of manifold having an input by means of the conduit (112) and an output through openings (110) in the diffuser (100). The opposite end of the conduit (112) is connected to a source of air such as an air pump (114). In operation, as described in US patent no. 4,924,847, a source of fuel such as a piece of wood or coal is placed on the surface of the diffuser plate (104) in the combustion chamber (116) of the burner (102). Ignition of the wood is initiated by igniting a suitably positioned supply of paper or other readily combustible material. After ignition, temperature is established, the air pump is turned on, and air is forced through the conduit and out of the diffuser (100) through openings (110) in the diffuser plate (104). Combustion of the wood follows virtually instantaneously and is prompted by the jets of air, with identified arrows, exiting through openings (110) in the diffuser plate (104).
Considered as an old fuel for a long time and sometimes forgotten, biofuel is becoming again a very interesting fuel as it is not only renewable, the time to produce fuel being from a few months to a few years, but unlike fossil fuel, where fuel has been accumulated through time, it does not and will not create that environment and climatic instability created by the use of fossil fuel. It is with that spirit in mind that this invention is presented. The present system is specially adapted to burn chunks or pieces of wood or similar byproducts of the biofuel family.
From the original patent, major applications of the burner were the integration of the system to portable products where batteries were the power supply for the air blower. The operating autonomy of prior art combustion systems is in general short, therefore, many batteries are required and the whole thing may be expensive. The following references describe other examples of prior art burners: Japanese patents nos 52-45740 and 55-68506; US patents nos 3,635,651; 3,635,644; 4,184,456; 3,492,986; 1,983,709; 739,491; 4,377,153; 4,504,218; 3,170,504; 3,885,907; 4,248,586; 4,309,948; 1,731,053; 2,663,366; 3,954,387; 4,063,873; 4,674,973; 1,782,229; 4,639,213; 3,810,732; 3,870,459; and 1,552,365.
SUMMARY OF THE INVENTION An object of the present invention is to propose an improved burner that provides dynamic combustion at low pressure and therefore consumes less energy than prior art burners .
In accordance with the invention, that object is achieved with a burner comprising a combustion chamber bottomed with a diffuser plate, the diffuser plate having an upper surface adapted to support a source of f el , a lower surface and spaced-apart openings therethrough. The burner further comprises an air-receiving chamber in fluid communication with the combustion chamber via the diffuser plate, the air-receiving chamber having an air inlet for connection to an air pump means for forcing air through the openings of the diffuser plate so as to cause the air to exit on the upper surface thereof in the form of small jets of a given velocity.
The burner is characterized in that it further comprises a dynamic air chamber topped with the diffuser plate, the dynamic air chamber having a bottom wall provided with a funnel-shaped inlet in communication with the air-receiving chamber for receiving an air flow of a given velocity from the air-receiving chamber and increasing said velocity to thereby create an air turbulence zone below the diffuser plate. The present invention also relates to a cooking apparatus comprising a burner as described hereinbefore, a grill assembly mountable above the burner and a support to support the grill assembly above the burner.
A description of a cooking apparatus incorporating a burner according to a preferred embodiment of the present invention will now be given in details with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional side elevational view of a cooking apparatus including a burner according to a preferred embodiment of the present invention.
Figure 2 is a cross-sectional front elevational view of the cooking apparatus of figure 1. Figure 3 is a perspective view of the burner of figure 1.
Figure 4 is an exploded side elevational view of the burner of figure 1.
Figure 5 is a cross-sectional view of another version of a dynamic air chamber which may be set under the diffuser plate of the burner of figure 1.
Figure 6 is a cross-sectional side elevational view of a prior art burner of a combustion system. DESCRIPTION OF A PREFERRED EMBODIMENT Referring to figures 1 and 2, the cooking apparatus (10) such as a portable stove including a preferred embodiment of a burner (14) according to the present invention is illustrated. The cooking apparatus (10) in a general manner comprises a grill assembly (12) with handles (52), a tubular burner (14) and a support to mount the grill assembly (12) over the burner (14). The support preferably consists of an open container (16) adapted to receive therein the burner (14) in an upright position. The container (16) has sidewalls (18) each having an upper edge (20) adapted to receive and support a corresponding outer edge (22) of the grill assembly (12) such that the grill (12) is mountable over the burner (14) which is enclosed in the container (16). More particularly, the upper edge (20) of each of the sidewalls (18) defines an L-shaped shoulder on which a corresponding outer edge (22) of the grill (12) is resting.
The burner (14) is made of a heat-resistant material preferably stainless steel. Referring also to figure 3, the burner (14) comprises a combustion chamber (60) bottomed with a diffuser plate (62). The combustion chamber (60) preferably has a cylindrical side wall (61). The diffuser plate (62) has an upper surface adapted to support a source of fuel , a lower surface and spaced-apart openings (68) through the diffuser plate (62) which preferably define a latticed pattern of openings, as best seen from figure 3. The source of fuel is preferably wood.
An air-receiving chamber (70) is in fluid communication with the combustion chamber (60) via the diffuser plate (62). The air-receiving chamber (70) is fitted with a conduit (72) thereby creating a type of manifold having an inlet by means of the conduit (72) and an output through openings (68) in the diffuser plate (62). The opposite end of the conduit (72) is devised to be connected to a source of air such as an air pump (74) for forcing air through the openings (68) of the diffuser plate (62) so as to cause the air to exit on the upper surface thereof in the form of small jets, represented with arrows, of a given velocity.
Referring also to figure 4, the burner (14) may comprise a shield (69) surrounding the side wall (61) of the combustion chamber (60). Also preferably, the combustion chamber (60) has an upper edge provided with a restrictive collar (71).
The diameter of the collar (71) is directly related to the dimension of the diffuser plate (62) (or to the dimension and quantity of the openings (68) of the diffuser plate (62) and the quantity of air supplied by the pump (74) through the diffuser plate (62) at near maximum speed). The collar (71) provides a positive pressure inside the combustion chamber (60) to ensure that external air does not recirculate inside the combustion chamber (60). It also limits the dimension of the piece of wood to be inserted in the combustion chamber (60).
Referring to figures 1 and 2, the air-receiving chamber
(70) of the preferred embodiment illustrated has a bottom wall
(76) and side walls (78) formed by an outwardly protruding circular recess shaped in the bottom wall (17) of the container (16). This recess is adapted to be covered by a dome-shaped member (79) which defines the top wall of the air-receiving chamber (70). The conduit (72) may advantageously be connected to one of the sidewalls (78) of the air receiving chamber (70) to form the air inlet thereof. Referring now also to figure 4, the burner (14) is characterized in that it further comprises a dynamic air chamber (80) topped with the diffuser plate (62). The bottom wall (82) of the dynamic air chamber (80) comprises a rimmed aperture (84) which is adapted to be sealingly connected with an uppermost protruding portion (86) of the dome-shaped member (7-9) which is provided with a hole.
As can best be appreciated from figures 1 and 2, the dome- shaped member (79) as it is connected with the rimmed aperture (84) of the dynamic air chamber (80) defines a funnel-shaped inlet for the dynamic air chamber (80) in communication with the air-receiving chamber (70) for receiving an air flow of a given velocity from the air-receiving chamber (70) and increasing said velocity to thereby create an air turbulence zone below the diffuser plate (62). Therefore, the dynamic air chamber (80) provides dynamic combustion, even with a lower pressure from the air pump (74). For the best results, the diffuser plate (62) and the bottom wall (82) of the dynamic air chamber (80) are preferably concave.
In operation, the source of fuel such as a piece of wood or coal is placed on the surface of the diffuser plate (62) in the combustion chamber (60) of the burner (14). Ignition of the wood is initiated by igniting a suitably positioned supply of paper or other readily combustible material. After ignition, temperature is established, the air pump (74) is turned on, and an air flow is forced through the conduit (72) into the air- receiving chamber (70), accelerated by passing through the air- funnel-shaped inlet and out through the openings (68) in the diffuser plate (62). Combustion of the wood follows virtually instantaneously and is prompted by the jets of air, with identified arrows, exiting through openings (68) in the diffuser plate (62).
As seen in figure 6, air under pressure in the prior art manifold provides a steady, smooth and fast moving air flow represented by dots, whereas, as seen in Figs. 1 and 2, air under pressure with the funnel-shaped air inlet of the dynamic air chamber (80) provides a turbulent fast moving air flow. In other words, the dynamic air chamber adds movement or turbulence to the steady, smooth and fast moving air flow of the prior art manifold. The distance of the funnel-shaped air inlet, which is actually the hole in the dome-shaped member (79), and the diffuser plate (62) is between point five cm (,5 cm) to two point five cm (2,5 cm) with a preferred point nine five cm ( ,95 cm). The diameter of the hole (86) of the funnel is between one cm (1 cm) and three cm (3 cm).
Referring to figure 5, another version of a dynamic air chamber (80) according to the invention and which may be set under the diffuser plate (62) of a burner (14) is illustrated. In this case the funnel-shaped inlet (88) is formed in the rimmed aperture (84) of the bottom wall (82) of the chamber (80). This funnel-shaped air inlet (88) provides three different seatings for the air-receiving chamber (not illustrated): first (indicated as "a") on the perimeter of the bottom wall (82), second (indicated as "b" ) on the perimeter of the rimmed aperture (84) and third (indicated as "c") inside the funnel. The angle C is between 359 and 85s but preferably 75s to 80 B. The angle © provides a long smooth flow of air. The funnel-shaped air inlet (88) allows, when used with a large conduit, a sharp low profile.
As can be appreciated, this preferred embodiment of a dynamic air chamber according to the present invention may advantageously be installed under the diffuser plate (104) of the cooking apparatus illustrated in figure 6.

Claims

WHAT IS CLAIMED IS:
1. A burner (14) for a cooking apparatus (10) comprising: a combustion chamber (60) bottomed with a diffuser plate (62), the diffuser plate (62) having an upper surface adapted to support a source of fuel , a lower surface and spaced-apart openings (68) therethrough; an air-receiving chamber (70) in fluid communication with the combustion chamber (60) via the diffuser plate (62), the air-receiving chamber (70) having an air inlet (72) for connection to an air pump means (74) for forcing air through the openings (68) of the diffuser plate (62) so as to cause the air to exit on the upper surface thereof in the form of small jets of a given velocity, the burner (14) being characterized in that it further comprises: a dynamic air chamber (80) topped with the diffuser plate
(62), the dynamic air chamber (80) having a bottom wall (82) provided with a funnel-shaped inlet (79) in communication with the air-receiving chamber (70) for receiving an air flow of a given velocity from the air-receiving chamber (70) and increasing said velocity to thereby create an air turbulence zone below the diffuser plate (62).
2. A burner (14) according to claim 1, characterized in that the diffuser plate (62) is concave.
3. A burner (14) according to anyone of claims 1 and 2, characterized in that the bottom wall (82) of the dynamic air chamber (80) is concave.
4. A burner (14) according to anyone of claims 1 to 3, characterized in that the bottom wall (82) of the dynamic air chamber (80) comprises a rimmed aperture (84) and that the burner (14) comprises a dome-shaped member (79) defining the funnel-shaped inlet, the dome-shaped member (79) having an uppermost protruding portion (86) provided with a hole and adapted to fit together with the rimmed aperture (84) of the bottom wall (82) of the dynamic air chamber (80).
5. A burner (14) according to anyone of claims 1 to 4 , characterized in that the air-receiving chamber (70) comprises a top wall defined by the dome-shaped member (79).
6. A burner (14) according to anyone of claims 1 to 5, characterized in that the air-receiving chamber (70) includes side walls (78) and a bottom wall (76), one of the sidewalls (78) being provided with the air inlet (72) of the air- receiving chamber (70).
7. A burner (14) according to anyone of claims 1 to 6, characterized in that the combustion chamber (60) has a cylindrical side wall (61).
8. A burner (14) according to anyone of claims 1 to 7, characterized in that the combustion chamber (60) has an upper edge provided with a restrictive collar (71).
9. A burner (14) according to anyone of claims 1 to 8 , characterized in that it comprises a shield (69) surrounding the side wall (61) of the combustion chamber (60).
10. A burner (14) according to anyone of claims 1 to 9, characterized in that the openings (68) in the diffuser plate (62) define a latticed pattern of openings (68).
11. A burner (14) according to anyone of claims 1 to 10, characterized in that the burner (14) is made of a heat- resistant material.
12. A burner (14) according to anyone of claims 1 to 11, characterized in that the burner (14) is made of stainless steel .
13. A burner (14) according to anyone of claims 1 to 12, characterized in that it further includes the source of fuel.
14. A burner (14) according to anyone of claims 1 to 13, characterized in that the source of fuel is wood.
15. A cooking apparatus (10) characterized in that it comprises: a burner (14) according to anyone of claims 1 to 14; a grill assembly (12) mountable above the burner (14); and a support to support the grill assembly (12) above the burner ( 14) .
16. A cooking apparatus (10) according to claim 15, characterized in that the support comprises an open container
(16) adapted to receive therein the burner (14) in an upright position, the container (16) having sidewalls (18) each having an upper edge (20) adapted to receive and support a corresponding outer edge (22) of the grill assembly (12) such that the grill assembly (12) is mountable over the burner (14) enclosed in the container (16).
17. A cooking apparatus (10) according to claim 16, characterized in that the container (16) has a bottom wall (17) provided with an outwardly protruding circular recess adapted to be covered by the dome-shaped member (79) so as to form the air-receiving chamber (70).
PCT/CA1998/000761 1997-08-08 1998-08-07 Burner for a cooking apparatus WO1999008048A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU87247/98A AU8724798A (en) 1997-08-08 1998-08-07 Burner for a cooking apparatus
CA002299251A CA2299251A1 (en) 1997-08-08 1998-08-07 Burner for a cooking apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,211,502 1997-08-08
CA 2211502 CA2211502A1 (en) 1997-08-08 1997-08-08 Improvement in a combustion system

Publications (1)

Publication Number Publication Date
WO1999008048A1 true WO1999008048A1 (en) 1999-02-18

Family

ID=4161117

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1998/000761 WO1999008048A1 (en) 1997-08-08 1998-08-07 Burner for a cooking apparatus

Country Status (3)

Country Link
AU (1) AU8724798A (en)
CA (1) CA2211502A1 (en)
WO (1) WO1999008048A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005063096A1 (en) 2003-12-30 2005-07-14 Woodflame Inc. Insulated barbecue cooking device
WO2009021886A2 (en) * 2007-08-10 2009-02-19 BSH Bosch und Siemens Hausgeräte GmbH Cooking appliance, in particular vegetable oil cooker

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US1731053A (en) 1928-05-31 1929-10-08 Doherty Res Co Porous refractory diaphragm
US1782229A (en) 1928-12-17 1930-11-18 Econoheet Company Space heater
US1983709A (en) 1932-09-28 1934-12-11 Air O Mat Burner Company Fuel burner
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005063096A1 (en) 2003-12-30 2005-07-14 Woodflame Inc. Insulated barbecue cooking device
WO2009021886A2 (en) * 2007-08-10 2009-02-19 BSH Bosch und Siemens Hausgeräte GmbH Cooking appliance, in particular vegetable oil cooker
WO2009021886A3 (en) * 2007-08-10 2010-09-23 BSH Bosch und Siemens Hausgeräte GmbH Cooking appliance, in particular vegetable oil cooker

Also Published As

Publication number Publication date
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AU8724798A (en) 1999-03-01

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