Patent Application
20080168975
(a) Field of the Invention
The present invention relates to a roasting oven and heating device thereof, and more particularly to the structural body of a roasting oven for roasting food materials and an internal heat generating device, specifically providing a configurational structure that enables combustion of fuel material, whereafter, a simple operating method can be used to disperse the fuel material and generate three-dimensional heat radiation waves that are able to synchronously roast the food material. Moreover, during the course of roasting, cleanliness of the location is preserved, and the structure is easy to clean after use.
(b) Description of the Prior Art
Methods of roasting food material include the conventional method of using flames from a fire located below the food material or the Japanese style of using heat waves generated above and transmitted downward towards upper surfaces of the food material, as well as appliances including a bread toaster that uses upper and lower heat sources to heat bread. Moreover, heated air is used, whereby, after actuation, synchronous three-dimensional surface heating of food material can be carried out. Furthermore, fuel material disposed in a bottom portion of a heated earthen body is used to smolder other types of food material, wherein an opening of the earthen body is covered and sealed, thereby enabling heat radiation waves emitted from the smoldering fuel material to first heat the internal air, and then transmission of the heated air heats the surface of the food material. The smoldering method indirectly heats the food material by using the air as a thermal medium, thus, taste of the roasted food material is different from that of food material roasted directly by means of heat waves, for example, roast duck must be directly heated with heat radiation waves in order for the duck meat to contract and dry up, and thereby provide a different chewing and taste experience.
Fuel material used in the aforementioned roasting appliances can be carbon fuel material or heat energy can be transformed from electric heating or gas heating. If a method is used to ignite carbon fuel material or wood material, then other subsidiary appliances must be used, or combustion can be implemented directly on a fire grate of a bottom portion of a roasting oven, resulting in ashes dropping down through perforations in the fire grate after combustion, thereby dirtying the surroundings, and air gaps in the fire grate increase the through flow rate of cold air flow, causing cold air to directly enter the roasting oven and produce a drop in temperature that affects roasting speed.
If the food material is meat, grease produced after heating the meat drips through the fire grate and defiles the surroundings, and in order to form a relatively large area of heat power, after combustion the carbon fuel material must be gripped with tongs and disposed at a relatively peripheral position interior of the roasting oven, operation procedure of which often results in burning the arms of the operator.
A primary objective of the present invention is to provide a roasting oven that is convenient to use and effectively produces three-dimensional heat radiation waves and a heating device thereof, which uses a fire tray, and an igniting platform formed at a central portion of the fire tray enables igniting carbon fuel material; after combustion of the carbon fuel material, a simple pushing aside method is used to move the carbon fuel material into lateral combustion troughs, thereby forming a peripheral burning function, and the vacated fire tray then enables food material to be placed thereon for heating by the peripheral three-dimensional heat radiation formed by the peripheral burning of the carbon fuel material.
A second objective of the present invention is to position a fire tray at a bottom portion of a broiler.
A third objective of the present invention is to design the fire tray with a circular shape or square shape.
To enable a further understanding of said objectives and the technological methods of the invention herein, brief description of the drawings is provided below followed by detailed description of the preferred embodiments.
Referring to
The through hole 11 is defined in the bottom portion of the broiler 1, and a convex arched body 31 is located on an inner breadth of the fire tray 3 corresponding to position of the through hole 11. A corresponding concave combustion trough 35 is formed lateral to the arched body 31, and a top portion of the arched body 31 is a flat igniting platform 32, and perforations 33 vertically penetrate through the igniting platform 32 to enable supplying an air flow. Subsidiary air gaps 34 are defined in an inclined side wall 311 of the arched body 31, and a periphery of the combustion trough 35 is provided with a wall 351 shaped according to that of the combustion trough 35.
The broiler 1 and the surrounding 2 are joined together by means of a bottom tray 21 of the bottom portion of the surrounding 2, and convection holes 22 vertically penetrate the bottom tray 21.
Referring to
Referring to
The bottom portion of the broiler 1 is elevated using the elevating members 4, thereby enabling the air A to enter from the space created by elevating the broiler above the ground. A periphery of the fire tray 3 forms the wall 351, and a clearance G separates the wall 351 and the broiler 1, which prevents heat waves generated by the carbon fuel material 52 from being directly conducted to the broiler 1 therethrough. Apart from the heat waves radiating upwards, other heat from the broiler 1 is prevented from being directly transmitted to the surrounding 2 by a space 20 similarly provided between the broiler 1 and the external surrounding 2, thus providing the surrounding 2 with a protective function.
The surrounding 2 is primarily fabricated from any material able to be formed into a concrete shape, and is a simple plate made from iron or iron-copper or wooden material, such as wood boards, pressed boards or bamboo splints. Materials that have heat resistant properties are preferred.
The convection holes 22 defined in the bottom tray 21 of the surrounding 2 enable cold air to enter therethrough and pass through the space 20, thereby contributing to the temperature drop to the surrounding 2, and preventing the surrounding 2 from reaching a high temperature.
Referring to
The aforementioned convection of the air A can be also implemented directly through holes 73 defined in the breadth of the cover 7, thereby enabling hot air to directly pass therethrough without being regulated. Such a configuration is applicable for use when roasting standard quantified carbon fuel material 52 and quantified food material 60, such as use in commercial locations, thereby eliminating the need for installation of the regulating valve 72 and reducing cost.
Heat radiation waves 520 produced by the carbon fuel material 52 are radiated upwardly or obliquely, thus, transmitting close to three-dimensional angular radiation to the food material 60 disposed in the upper central area of the broiler 1, and thereby enabling equalized heating of the entire external surface of the food material 60.
The inner surface of the cover 7 can be provided with a reflecting surface 730 facing the carbon fuel material 52, thereby enabling inverse reflection of the incident heat radiation waves 520 towards the food material 60. The reflecting surface 730 is able to produce an aggregation effect due to curvature of the cover 7, thereby enabling reflecting and concentrating the heat energy on the food material 60 located at the center of the broiler 1.
If the food material 60 is meat food material or food material having water content, then a tray 6 can be used to hold the food material, and the tray 6 is provided with a support device 61 to support food material or provide a clamping basis when withdrawing the food material.
Feet 62 are located below the tray 6, thereby enabling lateral flow of the air A after entering the perforations 33. The tray 6 is a disk body, interior of which is able to collect grease produced after heating the food material 60, thereby avoiding tainting the lower portion of the roasting oven 10 with grease, as well as preventing staining a tabletop 40, and maintaining cleanliness of the roasting area.
The elevating members 4 used on the tabletop 40 are of low height dimensions, if implemented on the ground, then length of the elevating members 4 can be altered by a method of assembling/disassembling feet material, thereby raising height of the roasting oven 10 above the ground, and facilitating the user in upright operation thereof.
The regulating valve 72 primarily enables pressure release of the upper aggregated hot air, wherein regulating objective is to enable modulation in speed of release of the hot air flow. If the speed of release is high, then the carbon fuel material 52 acquires an ample supply of oxygen, and is thus able to produce a substantially large heat output. However, in order to achieve a slow fire roasting of enable the food material, then the regulating valve 72 is able to lower the speed of release of the hot air flow, thereby preventing the air A from acquiring high convection kinetic energy, and retarding combustion speed of the carbon fuel material 52, thus producing low power heating.
Structural configuration of the regulating valve 72 is a general air flow rate regulating device, such as a vane-type or valve-type or blocking-type regulating valve device, and the regulating valve is of general component design, and thus not further described herein.
Referring to
Referring to
Referring to
An upper portion of the square broiler 100 is provided with a cover plate 700 of corresponding shape, and the regulating valve 72 is similarly fitted to the cover plate 700. Long food material can be disposed on a top surface of the square-shaped arched body 310 of the igniting tray 32, and heat waves transmitted from the two side combustion troughs 350 can similarly engulf food material placed central of the broiler 100 (similar to that depicted in
Referring to
A platform 23 can be joined between an upper opening of the surrounding 2 and a corresponding periphery of an end hole of the broiler 1 to serve as a seal end and beautify the structure or serve as a working surface for placement of additional ingredients when roasting, and two connecting points form a reinforcing mechanical strength that enable a periphery of the roasting oven 10 to sustain a relatively large mechanical impact force, thereby protecting safety of the entire structure.
Referring to
Condition for implementation of the broil tray 9 is that convection passageways are able to be formed between the upper end hole of the broiler 1 and the broil tray 9, thereby enabling heated air to be outwardly discharged. Such an implementation is actualized in an embodiment having air drains formed at sides of the broil tray 9 or by means of through holes defined at suitable radially inward locations of the broil tray 9, primary function of which is to provide the air A with convection paths. The air drains or through holes are of general structural design, and thus not described herein.
After covering the upper end hole of the broiler 1, then the broil tray 9 is able to accept the heat radiation waves 520 transmitted by the carbon fuel material 52. The broil tray 9 can be fabricated from material of low specific heat or high specific heat, such as an iron, metal or mineral plate, and the upper surface of the broil tray enables broiling plate-like or small size food material 600, while interior of the broiler 1 maintains roasting of the primary food material 60. Hence, heat energy transformed from the single fire tray 3, apart from being able to roast the primary food material 60, moreover, waste heat absorption and transmission through the broil tray 9 enables synchronous broiling of the plate-like food material 600.
Referring to
Height position of the grill 36 is such that apart from corresponding to position of the air gaps 34 and air flow passing therethrough, it also enables the grill 36 to sift the carbon fuel material 52. Moreover, the grill 36 can be positioned below the air gaps 34, thereby only providing functionality to sift the carbon fuel material 52 to prevent ashes from covering the carbon fuel material 52 after separating from the surface thereof during combustion, and enabling the ashes to drop below, which thus enables the carbon fuel material 52 to provide a surface area that is able to come in direct contact with oxygen during the course of combustion and satisfy oxygen consumption requirements for combustion of the carbon fuel material 52.
Referring to
A central portion of the fire tray 3 forms the arched body 31, a top surface of which forms a cover 37, the air gaps 34 are defined in lateral walls of the arched body 31. Hence, blowing of a strong lateral air flow first impacts an outer surface of the fire tray 3, which disperses wind pressure, while the low speed air A is turned, dissipating kinetic energy thereof during the course of turning, and enters through the air gaps 34, whereafter kinetic energy of formed heated air causes the air to naturally rise, thereby supplying working oxygen required by the carbon fuel material 52 for combustion thereof, and effectively counteracting the strong lateral air flow.
Pressure of a lateral streamline flow that flows vertically upward is dispersed after impacting the cover 37, thereby preventing any obvious influence on the carbon fuel material 52.
Another function of the cover 37 is to bear fallen carbon dust during the combustion operation, thereby avoiding dirtying the surroundings, and the function that causes turning of the air flow prevents the air A from directly blowing vertically into the broiler 1.
The original combustion troughs 35 of the fire tray 3 serve as holding troughs 352 to receive carbon ashes after combustion, whereafter the fire tray 3 can be extracted to enable discarding and cleaning out the ashes.
A barbecue wire frame 90 can be positionally joined to the internal girth of the broiler 1, thereby enabling food material to be placed on the wire frame 90 and absorb heat.
Regardless of whether the aforementioned heating device implementation is attached inside a broiler or is an independent body, a windbreak device 110 may be additionally located at a bottom portion of the related heating device 30, as shown in
Referring to
It is of course to be understood that the embodiments described herein are merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.
