Grill and heating cooker

Abstract

A grill (2) is provided with: a heating chamber (20); a door body (21); an upper heating unit (22) that heats the upper surface of the object to be heated; a pair of lower heating units (23) that are disposed on the outer sides of the pair of side wall sections (203), respectively, and that have infrared radiation sections (230) that radiate infrared rays into the heating chamber (20) from the outer sides of the side wall sections (203) and heat the lower surface or side surfaces of the object to be heated; and an exhaust duct (30) through which exhaust gas in the heating chamber (20) is discharged from the exhaust port (301) to the outside of the heating chamber (20), each side wall part (203) has a side opening part (24) in a region facing the infrared emission part (230) of each lower heating unit (23), and the side opening part (24) is covered by a side transmission part (26) through which infrared rays emitted from the infrared emission part (230) of each lower heating unit (23) pass.

Description

Technical Field

[0001] The present invention relates to a grill and a heating cooker equipped with the grill. Background Art

[0002] Conventionally, a heating cooker is known that includes a grill having a pair of lower-fire burners consisting of Bunsen burners disposed on the lower inner portions of the left and right side walls of a heating chamber. In this heating cooker, the lower surface or side surfaces of an object to be heated are heated by exhaust combustion gas ejected from the flame holes of the lower-fire burners toward the left and right central portions of the heating chamber. In addition, in this heating cooker, secondary air guide plates extending from the inner wall of each side wall toward the inner side of the heating chamber are disposed above and below the air inlet port provided at the lower portion of each side wall. Furthermore, secondary air is guided from the outside of the heating chamber to the periphery of the flame hole of each lower-fire burner by each secondary air guide plate, and the exhaust combustion gas ejected from the flame hole flies to the left and right central portions of the heating chamber through the secondary air flow (e.g., Japanese Patent Laid-Open Gazette No. 2015-19827).

[0003] However, during cooking using a grill, grease, oil smoke, and the like from the food scatter inside the heating chamber, contaminating the heating chamber, and thus the user needs to clean the heating chamber.

[0004] However, in the above-mentioned conventional grills, there are many parts protruding into the heating chamber, such as the lower fire burner and the secondary air guide plate. Therefore, there is a problem that the user's hands are difficult to reach the parts that need to be cleaned, and the cleanability is poor. Summary of the Invention

[0005] An object of the present invention is to provide a grill having excellent cleanability inside a heating chamber and a cooking device including the grill.

[0006] According to the present invention, there is provided a grill comprising:

[0007] A rectangular box-shaped heating chamber having an upper wall, a pair of side walls, a bottom wall, a rear wall, and a front opening that opens forward, and capable of storing heated objects;

[0008] a door body, the door body being capable of opening and closing the front opening of the heating storage from the front;

[0009] a pair of lower heating units, each of the pair of lower heating units being disposed on an outer side of a pair of side walls of the heating chamber and having an infrared radiating portion configured to radiate infrared rays from an outer side of each of the pair of side walls into the heating chamber to heat a lower surface or a side surface of the object to be heated; and

[0010] An exhaust duct is connected to the heating reservoir and forms an exhaust passage connected to an exhaust port, and the exhaust port is used to discharge the exhaust gas in the heating reservoir to the outside of the heating reservoir.

[0011] Each of the side walls has a side opening in a region facing the infrared radiation portion of each of the lower heating units.

[0012] The side opening of each of the side wall portions is covered by a side transmissive portion that transmits the infrared rays emitted from the infrared ray emitting portion of each of the lower heating units.

[0013] According to the present invention, it is possible to provide a grill having an excellent cleanability inside a heating chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic perspective view showing an example of the heating cooker according to the first embodiment of the present invention.

[0015] Figure 2 This is a schematic perspective view of main parts showing an example of a grill according to Embodiment 1 of the present invention.

[0016] Figure 3 This is a schematic perspective view of main parts showing an example of the lower portion of the grill according to the first embodiment of the present invention.

[0017] Figure 4 This is a schematic longitudinal sectional view of the main parts showing an example of a grill according to the first embodiment of the present invention.

[0018] Figure 5 This is a schematic cross-sectional view of the main parts showing an example of a grill according to the first embodiment of the present invention.

[0019] Figure 6 This is a schematic perspective view of main parts showing an example of the lower portion of a grill according to a second embodiment of the present invention.

[0020] Figure 7 This is a schematic longitudinal sectional view of the main parts showing an example of a grill according to a second embodiment of the present invention.

[0021] Figure 8 This is a schematic cross-sectional view of the main parts showing an example of a grill according to a second embodiment of the present invention.

[0022] Explanation of symbols

[0023] 1: Gas stove; 2: Grill; 2a: Grill; 3: Stove burner; 4: Grill plate; 5: Hood; 5a: Hood; 10: Stove body; 11: Top plate; 14: Grill opening; 20: Heating chamber; 21: Door; 22: Upper burner; 23: Lower burner; 23a: Heater; 24: Side opening; 26: Side transparent portion; 30: Exhaust duct; 51: Accommodation; 51a: Accommodation; 53: Auxiliary duct; 53a: Auxiliary duct; 60: Bottom reflector; 61: Bottom transparent portion; 63: Side reflector; 200: Front opening; 202: Upper wall; 203: Side wall; 204: Bottom wall; 205: Rear wall; 220: Burner plate; 221: Venturi tube; 230: Burner plate; 230a: Cylinder ;230b: heating element;231: venturi part;300: exhaust passage;301: exhaust port;310: duct opening;510: lower opening;510a: lower opening;511: upper wall;511a: upper wall;512: lower wall;512a: lower wall;513: front wall;513a: front wall;514: rear wall;514a: rear wall;515: side wall;515a: side wall;520: rear opening;520a: rear opening;530: auxiliary opening;530a: auxiliary opening;531: auxiliary upper wall;531a: auxiliary upper wall;532: auxiliary lower wall;532a: auxiliary lower wall;533: auxiliary rear wall;533a: auxiliary rear wall;534: auxiliary side wall;534a: auxiliary side wall;F: food to be cooked. DETAILED DESCRIPTION

[0024] (Implementation Method 1)

[0025] Hereinafter, a cooking device including a grill according to the present embodiment will be described in detail with reference to the drawings.

[0026] Figure 1 This is a schematic perspective view showing an example of the heating cooker according to the present embodiment applied to a built-in gas range. Figure 2 This is a schematic three-dimensional diagram of the main parts of the grill. Figure 3 This is a schematic perspective view of the main parts showing the lower part of the grill. Figure 4 This is a schematic longitudinal section of the main parts around the grill. Figure 5 The gas stove 1 includes a plurality of stove burners 3 facing upward from a stove opening (not shown) in a top plate 11 and a grill 2 incorporated in a stove body 10 serving as a main heating and cooking device.

[0027] The grill 2 includes a rectangular box-shaped heating chamber 20 having an upper wall 202, a pair of left and right side walls 203, 203, a bottom wall 204, a rear wall 205, and a front opening 200 that opens forward; and a door 21 that can be opened and closed from the front to close the front opening 200 of the heating chamber 20. In this specification, the door 21 side is referred to as the front side. When viewing the gas stove 1 from the door 21 side, the direction facing the back of the door 21 and the heating chamber 20 is referred to as the front-to-back direction, the width of the heating chamber 20 is referred to as the left-right direction, and the height of the heating chamber 20 is referred to as the up-down direction.

[0028] The heating chamber 20 houses a grill plate 4, for example, made of aluminum molded or cast bodies with excellent heat conductivity, as well as metal or ceramic cooking utensils such as a grill grate (not shown), a steamer, and a cast iron pot (Dutch oven). During cooking, food F is placed on or within these cooking utensils to be heated. Therefore, in this embodiment, the grill plate 4 and food F constitute the heated items.

[0029] The door body 21 is connected and supported to the stove body 10 in a manner that it slides back and forth to open and close. Although not shown in the figure, a connecting plate is provided at the lower rear portion of the door body 21, extending toward the interior of the heating chamber 20. The connecting plate is connected to a support frame of the appliance support body 40 that supports the grill plate 4 from below. Thus, by pulling the door body 21 forward, the grill plate 4 is pulled out to the front of the heating chamber 20, and by pushing the door body 21 backward, the grill plate 4 is accommodated in the heating chamber 20. In addition, in order to avoid complication, Figure 4 as well as Figure 5 The device support 40 is omitted.

[0030] An upper ignition burner (upper heating unit) 22 is provided on the upper wall 202 of the heating chamber 20. The upper ignition burner 22 is a surface-burning, fully one-stage burner whose lower surface is composed of a ceramic combustion plate 220. A plurality of flame holes are formed over substantially the entire area of ​​the lower surface of the combustion plate 220. Although not shown in the figure, a spark plug that generates a spark discharge when a high voltage is applied from an igniter and a thermocouple that serves as a flame detection sensor for detecting the presence or absence of a flame are provided behind the combustion plate 220 of the upper ignition burner 22. When the upper ignition burner 22 is ignited, a flame is formed over the entire lower surface of the combustion plate 220. Furthermore, combustion exhaust gas is ejected from the combustion plate 220 of the upper ignition burner 22 downward into the heating chamber 20, and infrared rays are radiated. The heat of the combustion exhaust gas and the radiant heat of the infrared rays are used to heat mainly the upper surface of the grill plate 4 and the food F placed on the grill plate 4. The upper ignition burner 22 has a venturi section 221 at its rear end, extending outward and rightward from the upper wall 202 of the heating chamber 20. Although not shown, a gas nozzle is inserted into an opening at the outer end of the venturi section 221. Therefore, when fuel gas is ejected from the gas nozzle into the opening of the venturi section 221, it is drawn into the venturi section 221 along with the surrounding air, generating a mixture of fuel gas and primary air, which is then supplied to the combustion plate 220.

[0031] The left and right side walls 203, 203 of the heating chamber 20 are provided with side openings 24, 24, respectively, which are longer in the front-to-back direction. The side openings 24, 24 are larger in the vertical and front-to-back directions than the combustion plates 230, 230 of the lower-fire burners 23, 23, which will be described later. Furthermore, the side openings 24, 24 are covered by infrared-transmissive side transmissive portions 26, 26, in a manner substantially coplanar with the side walls 203, 203. Therefore, the side transmissive portions 26, 26 face the combustion plates 230, 230 of the lower-fire burners 23, 23 in the left-to-right direction. Furthermore, by providing the side walls 203, 203 with the side transmissive portions 26, 26, the left and right inner wall surfaces of the heating chamber 20 are formed into substantially flat surfaces. For example, a heat-resistant material such as crystallized glass having excellent infrared transmissivity can be used as the side transmissive portions 26, 26. In addition, the side transmission portions 26, 26 may be subjected to surface treatment such as oil repellent treatment.

[0032] A pair of left and right lower burners (lower heating units) 23, 23 are provided on the outer sides of the left and right side walls 203, 203 of the heating chamber 20, extending in the front-to-back direction along the left and right side walls 203, 203. The left and right lower burners 23, 23 have the same structure, except for being bilaterally symmetrical. Therefore, the structure of the lower burners 23, 23 and their surroundings will be described using a single lower burner 23 as an example.

[0033] The lower burner 23 has a roughly rectangular shape that is elongated in the front-to-back direction. It is positioned upright with its short side oriented approximately vertically. Like the upper burner 22, the lower burner 23 is a surface-burning, fully primary burner constructed with a ceramic combustion plate 230 on the side of the sidewall 203. Although not shown, behind the combustion plate 230 of the lower burner 23 are located a spark plug that generates a spark discharge when a high voltage is applied from an igniter, and a thermocouple that serves as a flame detection sensor to detect the presence of a flame. When the lower burner 23 is ignited, a flame forms along the entire side of the combustion plate 230, ejecting combustion exhaust gas toward the sidewall 203 while emitting infrared rays. The combustion exhaust gas ejected from the combustion plate 230 of the lower burner 23 is blocked by the aforementioned side transmissive portion 26. However, the infrared rays emitted from the combustion plate 230 of the lower burner 23 pass through the side transmissive portion 26 and are radiated into the heating chamber 20. As a result, the radiant heat of infrared radiation primarily heats the grill plate 4 and the lower surface or side surfaces of the food F placed on it. Therefore, in this embodiment, the combustion plate 230 of the lower burner 23 constitutes the infrared radiating portion. The lower burner 23 has a venturi section 231 extending rearward at its rear end. Although not shown, a gas nozzle is inserted into an opening at the rear end of the venturi section 231. Therefore, when fuel gas is ejected from the gas nozzle into the opening of the venturi section 231, the fuel gas is drawn into the venturi section 231 along with the surrounding air, generating a mixture of fuel gas and primary air, which is then supplied to the combustion plate 230. Alternatively, the lower burner 23 can be positioned in an inclined position, with the combustion plate 230 facing the lower surface of the grill plate 4, and the upper end of the lower burner 23 is positioned further outward than the lower end.

[0034] An exhaust duct 30 connected to the cooking space in the heating chamber 20 is connected to the rear wall 205 of the heating chamber 20. The exhaust duct 30 can also be connected to the upper wall 202 of the heating chamber 20. The exhaust duct 30 is connected to the exhaust port 301 at the upper end, and the exhaust port 301 at the upper end is used to discharge exhaust gas containing combustion exhaust or oil smoke generated by food to the outside of the gas stove 1. Therefore, the exhaust duct 30 constitutes an exhaust passage 300. The exhaust duct 30 is extended obliquely upward from the upper part of the rear wall 205 of the heating chamber 20 toward the lower surface side of the top plate 11. The exhaust port 301 faces the grill opening 14 opened on the upper surface of the top plate 11 from below. In addition, on the left and right duct side walls (not shown) forming the exhaust duct 30, a duct opening portion 310 (see FIG. 1 ) opening to the outside is provided. Figure 3 The duct opening 310 is connected to an auxiliary opening 530 of an auxiliary duct portion 53 of the cover body 5 described later.

[0035] like Figure 2 、 Figure 3 as well as Figure 5 As shown, a cover 5 is provided on the outside of the side wall 203 of the heating chamber 20. This cover 5 covers the area where the combustion plate 230 of the lower-fire burner 23 is formed, at a predetermined distance from the outside. The cover 5 is connected to the side wall 203 of the heating chamber 20 at a predetermined location along the peripheral edge of the side wall 203. Thus, the cover 5 forms a recessed chamber on the outside of the side wall 203 of the heating chamber 20, which is recessed toward the outside of the heating chamber 20. Furthermore, the side wall 203, where the lateral permeable portion 26 of the heating chamber 20 is provided, and the front portion of the cover 5 provided on the outside of the side wall 203 define a housing 51. This housing 51 accommodates the combustion plate 230 of the lower-fire burner 23, which is separated from the cooking space within the heating chamber 20. Alternatively, the cover 5 can be connected from the upper wall 202 or the bottom wall 204.

[0036] The cover body 5 includes an upper wall 511, a lower wall 512, a front wall 513, a rear wall 514, and side walls 515 that form a accommodating portion 51. Furthermore, a slit-shaped lower opening 510 (first opening) that opens downward is formed on the lower wall 512 that forms the lower region of the cover body 5. Furthermore, a rectangular rear opening 520 (second opening) that opens rearward is formed on the upper portion of the rear wall 514 that forms the rear region of the cover body 5. Furthermore, the cover body 5 includes an auxiliary duct portion 53 that extends rearward from the periphery of the rear opening 520. The auxiliary duct portion 53 includes an auxiliary upper wall 531, an auxiliary lower wall 532, an auxiliary rear wall 533, and auxiliary side walls 534. Furthermore, the auxiliary duct portion 53 includes an auxiliary opening portion 530 that opens toward the exhaust duct 30. The auxiliary opening portion 530 is connected to the duct opening portion 310 of the exhaust duct 30. Therefore, the internal space of the accommodating portion 51 of the cover body 5 communicates with the exhaust duct 30 via the rear opening 520 or the auxiliary duct portion 53 .

[0037] When the lower burner 23 is burning, a ventilation effect is created, with the combustion exhaust gas ejected from the combustion plate 230 of the lower burner 23 being exhausted into the exhaust duct 30 through the rear opening 520. Consequently, the interior of the housing 5 reaches a negative pressure, allowing the air within the stove body 10 to be drawn into the housing 51 of the housing 5 through the lower opening 510. Furthermore, when the upper burner 22 is burning, a ventilation effect is created within the exhaust duct 30, causing the exhaust gas, including the combustion exhaust gas within the heating chamber 20, to be exhausted through the exhaust duct 30 to the exterior of the gas stove 1. Consequently, the interior of the housing 5, which is connected to the exhaust duct 30 via the auxiliary duct portion 53, reaches a further negative pressure, enhancing the ventilation effect. Consequently, the air within the stove body 10 is smoothly drawn into the housing 51 of the housing 5 through the lower opening 510. The air introduced into the housing 51 of the cover 5 and the combustion exhaust gas ejected from the combustion plate 230 of the lower burner 23 are then discharged into the exhaust duct 30 through the rear opening 520 and the auxiliary duct 53. Furthermore, together with the exhaust gas from the heating chamber 20, they are discharged from the exhaust port 301 to the exterior of the gas stove 1. As a result, a cooling air flow path is formed within the cover 5, passing from the lower opening 510 through the housing 51, via the rear opening 520 and the auxiliary duct 53, connecting to the exhaust duct 30. This effectively cools the side permeable portion 26 facing the combustion plate 230. Furthermore, the cover 5 prevents the combustion exhaust gas from the lower burner 23 from escaping into the stove body 10. Consequently, the intake of combustion exhaust gas from the openings of the venturi 231 of the lower burner 23 and the venturi 221 of the upper burner 22 is reduced. Consequently, combustion defects in the lower burner 23 and upper burner 22 can be suppressed. Furthermore, if the rear opening 520 is located above the lower opening 510, a plurality of lower openings 510 and rear openings 520 may be provided. Furthermore, the rear opening 520 is preferably provided further rearward than the lower opening 510. Furthermore, the lower opening 510 may be provided in the front region of the cover body 5 (e.g., the lower portion of the front wall 513 or the side wall 515), or in both the lower and front regions. Furthermore, the rear opening 520 may be provided in the upper region of the cover body 5 (e.g., the upper portion of the upper wall 511 or the side wall 515), or in both the rear and upper regions.

[0038] A bottom reflecting portion 60 is preferably formed on the upper surface of the bottom wall portion 204 of the heating chamber 20. The infrared rays from the lower fire burner 23 that are radiated into the heating chamber 20 through the side transmitting portion 26 are reflected toward the lower surface of the grill plate 4 through the bottom reflecting portion 60. The bottom reflecting portion 60 can be formed, for example, by laminating a metal plate such as aluminum having a high reflectivity on the bottom wall portion 204. In addition, the bottom wall portion 204 can also be formed of a BA (Bright Annealed) material. In addition, when the bottom reflecting portion 60 is formed, it is preferred that the bottom reflecting portion 60 is provided at least near the side opening portion 24 in a range corresponding to the length of the combustion plate 230 of the lower fire burner 23 in the front-to-back direction.

[0039] The upper surface of the bottom reflector 60 is preferably covered by a bottom transparent portion 61. The bottom transparent portion 61 is formed, for example, by laminating a heat-resistant material made of crystallized glass on the bottom reflector 60. By covering the upper surface of the bottom reflector 60 with the bottom transparent portion 61, infrared rays from the bottom-fire burners 23 that are radiated into the heating chamber 20 through the side transparent portions 26 are reflected by the bottom reflector 60. This also improves cleanability. The upper surface of the bottom reflector 60 may also be subjected to a surface treatment such as an oil-repellent treatment.

[0040] As described in detail above, according to the grill 2 of this embodiment, the lower burner 23 is separated from the cooking space within the heating chamber 20 by the side permeable portion 26. This prevents the adhesion of dirt such as grease and soot to the lower burner 23 and its surrounding components. Furthermore, according to this embodiment, the number of components protruding into the heating chamber 20, such as the lower burner 23 and the secondary air guide plate, can be reduced. This makes it possible to provide a grill 2 that is easy to clean within the heating chamber 20.

[0041] Furthermore, in conventional grills equipped with a lower-fire burner within the heating chamber and with air inlet openings in the side walls, during cooking, grease, soot, and the like scattered from the food can partially block the flame holes of the lower-fire burner exposed within the heating chamber, or the air inlet openings in the side walls can be partially blocked. Consequently, the shape of the flame collapses, or the amount of secondary air introduced into the heating chamber decreases. As a result, the combustion exhaust gas cannot fully reach the left and right central portions of the heating chamber, and heating performance is likely to decrease. However, according to this embodiment, the combustion plate 230 of the lower-fire burner 23 is separated from the cooking space within the heating chamber 20 by the side permeable portion 26. Therefore, dirt can be reliably prevented from adhering to the lower-fire burner 23 during cooking. Furthermore, according to this embodiment, since the cleanability of the heating chamber 20 is improved, a decrease in heating performance caused by dirt on the side permeable portion 26 can also be suppressed. Thus, stable heating performance can be ensured over a long period of time.

[0042] Furthermore, in conventional grills using a Bunsen burner as a bottom burner, the flame extends roughly horizontally from the flame hole toward the interior of the heating chamber. The secondary air from the air inlet provided in the sidewall causes the exhaust gas to flow in the direction of the flame. This easily causes interference between the flame and the cooking utensils, which can deteriorate the combustion of the Bunsen burner. Furthermore, the heating provided by the exhaust gas from a Bunsen burner has a strong directional nature. Therefore, when using cooking utensils such as the grill plate 4 or a cast iron pot, the temperature of the areas where the exhaust gas is more likely to strike is higher than that of the areas where it is less likely to strike. As a result, the cooking utensils are prone to temperature distribution, resulting in uneven heating of the heated items. This not only results in poor heating performance but also increases the risk of localized degradation of the cooking utensils. However, in this embodiment, a surface-burning bottom burner 23 is used, which features a combustion plate 230 that generates a short flame and radiates infrared light. Furthermore, the exhaust gas emitted from the bottom burner 23 is blocked by the lateral transmission portion 26. Consequently, the cooking utensils are heated by the radiant heat of the infrared light that diffuses radially. This prevents deterioration of combustion in the bottom burner 23. Furthermore, compared to using a Bunsen burner, the temperature distribution in the cookware is reduced. This allows for uniform heating of the object, resulting in excellent heating performance. Furthermore, since the flame or exhaust gas from the bottom burner 23 does not come into contact with the cookware, localized degradation of the cookware is prevented, improving its durability.

[0043] Furthermore, according to this embodiment, the cover 5 having the lower opening 510 and the rear opening 520 forms a cooling air flow path within the cover 5. This allows cooling of the side permeable portions 26. This suppresses temperature increases in the side permeable portions 26, improving durability. In particular, according to this embodiment, the cover 5 communicates with the exhaust duct 30. This facilitates cooling air flow within the cover 5, further cooling the side permeable portions 26.

[0044] Furthermore, according to this embodiment, the lower surface of the object to be heated can be efficiently heated by the infrared rays reflected by the bottom reflecting portion 60. This can improve the heating performance.

[0045] Furthermore, according to the present embodiment, the cleanability of the bottom wall portion 204 of the heating storage 20 can be improved by the bottom transparent portion 61 covering the upper surface of the bottom reflective portion 60 .

[0046] (Implementation Method 2)

[0047] The grill of this embodiment has the same structure as the grill of Embodiment 1, except that an infrared heater is used as the lower heating unit instead of the lower burner. Therefore, the same components as those of Embodiment 1 are denoted by the same reference numerals and their description will be omitted. The description will focus on the differences.

[0048] like Figures 6 to 8 As shown, similar to the first embodiment, the left and right side walls 203 of the heating chamber 20 of the grill 2a of this embodiment have side openings 24, 24 that are elongated in the front-to-back direction. These side openings 24, 24 are larger in the vertical and front-to-back directions than the heating elements 230b, 230b of the heaters 23a, 23a, described later. Furthermore, the side openings 24 are covered by infrared-transmissive side transmissive portions 26, 26, substantially coplanar with the side walls 203, 203. These side transmissive portions 26, 26 face the heating elements 230b, 230b of the heaters 23a, 23a, in the left-to-right direction.

[0049] A pair of left and right heaters 23a, 23a, are disposed on the outer sides of the left and right side walls 203, 203 of the heating chamber 20, extending in the front-to-back direction along the side walls 203, 203. The left and right heaters 23a, 23a have the same structure, except for being bilaterally symmetrical. Therefore, the structure of the heaters 23a, 23a and their surroundings will be described using one heater 23a as an example.

[0050] The heater 23a comprises a cylindrical portion 230a extending in the front-to-back direction along the sidewall 203, and a heating element 230b housed within the portion 230a. The portion 230a may be made of, for example, a heat-resistant tube made of crystallized glass with excellent infrared transmittance or ceramics with high far-infrared radiation. The heating element 230b may be made of, for example, a graphite film obtained by heat-treating a conventionally known polymer film or a polymer film to which a filler has been added.

[0051] The two ends of the cylinder 230a are sealed. The cylinder 230a is filled with an inert gas such as nitrogen and argon. Although not shown in the figure, one end of a lead is connected to each end of the heating element 230b. The other end of the lead is led out from the cylinder 230a to the outside. By supplying electricity to the lead, current flows through the heating element 230b, and heat is generated by the resistance of the heating element 230b. At this time, infrared rays are radiated from the heating element 230b. Moreover, the radiant heat of the infrared rays radiated into the heating chamber 20 by passing through the side transparent portion 26 mainly heats the grill plate 4 and the lower surface or side of the cooking object F placed on the grill plate 4. Therefore, in this embodiment, the heating element 230b constitutes an infrared ray radiating portion.

[0052] A cover 5a is provided on the outside of the side wall 203 of the heating chamber 20. The cover 5a covers the area where the heating element 230b of the heater 23a is formed, at a predetermined distance from the outside. The cover 5a is connected to the side wall 203 of the heating chamber 20 at a predetermined location on the peripheral edge of the side wall 203. Therefore, the side wall 203, on which the lateral permeable portion 26 of the heating chamber 20 is provided, and the cover 5a disposed on the outside of the side wall 203 define a housing portion 51a, which houses the heating element 230b of the heater 23a separated from the interior of the heating chamber 20.

[0053] The cover body 5a includes a semi-cylindrical side wall 515a forming the accommodating portion 51a, an upper wall 511a extending from the upper end of the side wall 515a toward the side wall portion 203, a lower wall 512a extending from the lower end of the side wall 515a toward the side wall portion 203, a front wall 513a extending from the front end of the side wall 515a toward the side wall portion 203, and a rear wall 514a extending from the rear end of the side wall 515a toward the side wall portion 203. The lower wall 512a, which forms the lower region of the cover body 5a, has a plurality of rectangular lower openings 510a (first openings) formed therein, opening downward at predetermined intervals in the front-to-back direction. Furthermore, a rectangular rear opening 520a (second opening) opening toward the rear is formed in the upper portion of the rear wall 514a, which forms the rear region of the cover body 5a. Furthermore, the cover body 5a includes an auxiliary duct portion 53a extending rearward from the periphery of the rear opening 520a. The auxiliary duct portion 53a includes an auxiliary upper wall 531a, an auxiliary lower wall 532a, an auxiliary rear wall 533a, and auxiliary side walls 534a. Furthermore, the auxiliary duct portion 53a includes an auxiliary opening portion 530a that opens toward the exhaust duct 30. Similar to the first embodiment, the auxiliary opening portion 530a is connected to the duct opening portion 310 of the exhaust duct 30. Therefore, the interior space of the housing portion 51a of the housing 5a communicates with the exhaust duct 30 via the rear opening 520a or the auxiliary duct portion 53a.

[0054] On the inner wall surface of the side wall 515a protruding toward the outside of the cover body 5a, it is preferred to form a side reflector 63. The infrared rays radiated from the heater 23a are reflected into the heating chamber 20 by the side reflector 63. Similar to the bottom reflector 60 of embodiment 1, the side reflector 63 can also be formed by laminating a metal plate such as aluminum with a high infrared reflectivity on the side wall 515a. In addition, the side wall 515a can also be formed by a BA material.

[0055] When power is supplied to the heater 23a and the heating element 230b generates heat, a ventilation effect is created, with the hot air generated by the heating element 230b of the heater 23a being discharged through the rear opening 520a into the exhaust duct 30. Consequently, a negative pressure is created within the housing 5a, allowing air within the stove body 10 to be drawn into the receptacle 51a of the housing 5a through the lower opening 510a. Furthermore, when the upper burner 22 is activated, a ventilation effect is created, causing exhaust gas, including combustion exhaust from the heating reservoir 20, to be discharged outside the gas stove 1 through the exhaust duct 30. Consequently, the housing 5a, which is connected to the exhaust duct 30 via the auxiliary duct 53a, further creates a negative pressure, enhancing the ventilation effect. This allows air within the stove body 10 to be smoothly drawn into the receptacle 51a of the housing 5a through the lower opening 510a. The air introduced into the housing 51a of the housing 5a is then discharged into the exhaust duct 30 through the auxiliary duct portion 53a, along with the hot air generated by the heating element 230b of the heater 23a. Together with the exhaust gas from the heating chamber 20, it is discharged from the exhaust port 301 to the exterior of the gas stove 1. As a result, a cooling air flow path is formed within the housing 5a, passing from the lower opening 510a through the housing 51a, through the rear opening 520a, and through the auxiliary duct portion 53a, connecting to the exhaust duct 30. This effectively cools the heater 23a itself and the side-transmitting portion 26 facing the cylindrical portion 230a of the heater 23a.

[0056] As in the first embodiment, a bottom reflector 60 is preferably formed on the upper surface of the bottom wall 204 of the heating chamber 20. The bottom reflector 60 reflects infrared rays emitted from the heater 23a into the heating chamber 20 through the side transmissive portion 26 toward the lower surface of the grill plate 4. Furthermore, as in the first embodiment, the upper surface of the bottom reflector 60 is preferably covered with a bottom transmissive portion 61.

[0057] As described in detail above, according to the grill 2a of this embodiment, similar to the first embodiment, heater 23a is separated from the cooking space within heating chamber 20 by side permeable portion 26. This prevents dirt such as grease and soot from adhering to heater 23a and its surrounding components. Furthermore, according to this embodiment, the number of components protruding into heating chamber 20 can be reduced. This provides a grill 2a that is easily cleanable within heating chamber 20.

[0058] Furthermore, according to this embodiment, the cleanability of the interior of the heating chamber 20 can be improved. Therefore, it is also possible to suppress a decrease in heating performance due to contamination of the side transmission portion 26. Thus, stable heating performance can be ensured over a long period of time.

[0059] Furthermore, according to this embodiment, the cooker can be heated by the radiant heat of radially diffused infrared rays. Consequently, the temperature distribution of the cooker is reduced compared to using a Bunsen burner. This allows for uniform heating of the object being heated, resulting in excellent heating performance. Furthermore, since heater 23a emits only infrared rays, localized degradation of the cooker can be suppressed, thereby improving the durability of the cooker.

[0060] Furthermore, according to this embodiment, the infrared rays emitted from the heater 23a can be used by the side reflectors 63 to effectively heat the object being heated. This improves heating performance. In particular, because the semi-cylindrical side reflectors 63 cover the outside of the heater 23a, the radially diffused infrared rays can be reflected upward, downward, and outward from the heater 23a into the heating chamber 20.

[0061] (Other embodiments)

[0062] (1) In the above embodiment, the lower heating unit that radiates infrared rays is used. However, in the present invention, the lower heating unit that radiates far infrared rays may also be used.

[0063] (2) In the above embodiment, a fully primary combustion upper ignition burner is used as the upper heating unit. However, in the present invention, other burners or heaters may be used as the upper heating unit.

[0064] (3) In the above embodiment, the cover is provided to cover a portion of the lower heating unit including the infrared irradiation portion from the outside. However, in the present invention, the cover may be provided to cover the entire lower heating unit from the outside.

[0065] While the present invention has been described in detail above, the present invention can be summarized as follows.

[0066] According to a first aspect of the present technology, there is provided a grill comprising:

[0067] A rectangular box-shaped heating chamber having an upper wall, a pair of side walls, a bottom wall, a rear wall, and a front opening that opens forward, and capable of storing heated objects;

[0068] a door body, the door body being capable of opening and closing the front opening of the heating storage from the front;

[0069] a pair of lower heating units, each of the pair of lower heating units being disposed on an outer side of a pair of side walls of the heating chamber and having an infrared radiating portion configured to radiate infrared rays from an outer side of each of the pair of side walls into the heating chamber to heat a lower surface or a side surface of the object to be heated; and

[0070] An exhaust duct is connected to the heating reservoir and forms an exhaust passage connected to an exhaust port, and the exhaust port is used to discharge the exhaust gas in the heating reservoir to the outside of the heating reservoir.

[0071] Each of the side walls has a side opening in a region facing the infrared radiation portion of each of the lower heating units.

[0072] The side opening of each of the side wall portions is covered by a side transmissive portion that transmits the infrared rays emitted from the infrared ray emitting portion of each of the lower heating units.

[0073] According to the first embodiment, the lower heating unit is separated from the cooking space within the heating chamber by the lateral permeable portion. This prevents grease, soot, and other dirt from adhering to the lower heating unit and its surrounding components. Furthermore, the first embodiment reduces the number of components protruding into the heating chamber, thereby improving cleanability within the heating chamber.

[0074] According to a second aspect of the present technology, in the above-mentioned first aspect,

[0075] A pair of covers are provided, each of which covers the infrared radiation parts of the pair of lower heating units from the outside.

[0076] Each of the cover bodies of a pair of the cover bodies has: a first opening, which is arranged in the lower area or the front area of ​​each of the cover bodies and near the side opening of each of the side wall parts; and a second opening, which is arranged in the upper area or the rear area of ​​each of the cover bodies and is located above the first opening.

[0077] According to the second embodiment, the ventilation effect generated by heating by the lower heating unit creates a negative pressure inside the housing. As a result, a cooling air flow path is formed within the housing, where air is drawn into the housing from outside via the first opening and then discharged to the outside via the second opening. This cools the side permeable portion, suppressing temperature increases in the side permeable portion and improving durability.

[0078] According to a third aspect of the present technology, in the above-mentioned second aspect,

[0079] Each of the covers is configured to communicate with the exhaust duct via the second opening.

[0080] During cooking, a ventilation effect is created within the exhaust duct, where exhaust gas from the heating chamber is discharged outside the heating chamber. Furthermore, according to the third embodiment, since each cover is connected to the exhaust duct via the second opening, air within the cover is discharged into the exhaust duct via the second opening. This increases the negative pressure within the cover, enhancing the ventilation effect. This facilitates the flow of cooling air into the cover, thereby cooling the side-permeable portion.

[0081] According to a fourth aspect of the present technology, in any one of the first to third aspects,

[0082] The bottom wall of the heating storage has a bottom reflecting portion at least near the side opening of each side wall portion, and the bottom reflecting portion reflects the infrared rays emitted from the infrared emitting portion of each lower heating unit through the side transmitting portion and into the heating storage toward the heated object.

[0083] According to the fourth aspect, the lower surface of the object to be heated can be efficiently heated by the infrared rays reflected by the bottom reflecting portion, thereby improving the heating performance.

[0084] According to a fifth aspect of the present technology, in the fourth aspect,

[0085] The bottom reflective portion is covered by a bottom transmissive portion that transmits the infrared rays.

[0086] According to the fifth aspect, the cleanability of the bottom wall portion of the heating storage can be improved.

[0087] According to a sixth aspect of the present technology, in any one of the first to fifth aspects,

[0088] Each of the lower heating units is a surface combustion type burner having a combustion plate configured to emit the infrared rays by burning supplied fuel gas.

[0089] According to the sixth aspect, a gas grill having excellent cleanability can be provided.

[0090] According to a seventh aspect of the present technology, in any one of the first to fifth aspects,

[0091] Each of the lower heating units is a heater having a heating element, and the heating element radiates the infrared rays when supplied with electric power.

[0092] According to the seventh aspect, an electric grill having excellent cleanability can be provided.

[0093] According to an eighth aspect of the present technology, in the seventh aspect,

[0094] A side reflector is provided. The side reflector is arranged outside each of the side wall portions and reflects the infrared rays radiated from the heating element of the heater into the heating chamber.

[0095] According to the eighth aspect, the object to be heated can be efficiently heated by infrared rays emitted from the heating element of the heater, thereby improving heating performance.

[0096] According to a ninth aspect of the present technology, there is provided a cooking device including the grill according to any one of the first to eighth aspects.

[0097] According to the ninth aspect, a cooking device equipped with a grill having excellent cleanability can be provided.

Claims

1. A grill, characterized in that: The grill has: A rectangular box-shaped heating chamber having an upper wall, a pair of side walls, a bottom wall, a rear wall, and a front opening that opens forward, and capable of storing heated objects; a door body, the door body being capable of opening and closing the front opening of the heating storage from the front; a pair of lower heating units, each of the pair of lower heating units being disposed on an outer side of a pair of side walls of the heating chamber and having an infrared radiating portion configured to radiate infrared rays from an outer side of each of the pair of side walls into the heating chamber to heat a lower surface or a side surface of the object to be heated; and An exhaust duct is connected to the heating reservoir and forms an exhaust passage connected to an exhaust port, and the exhaust port is used to discharge the exhaust gas in the heating reservoir to the outside of the heating reservoir. Each of the side walls has a side opening in a region facing the infrared radiation portion of each of the lower heating units. The side opening of each of the side wall portions is covered by a side transmissive portion that transmits the infrared rays emitted from the infrared ray emitting portion of each of the lower heating units.

2. The grill according to claim 1, wherein: A pair of covers are further provided, wherein the pair of covers respectively cover the infrared radiation parts of the pair of lower heating units from the outside. Each of the pair of covers has a first opening, which is provided in a lower region or a front region of each cover and is near the side opening of each side wall; and a second opening, wherein the second opening is arranged in an upper region or a rear region of each of the cover bodies and is positioned above the first opening.

3. The grill according to claim 2, wherein: Each of the covers is configured to communicate with the exhaust duct via the second opening.

4. The grill according to any one of claims 1 to 3, characterized in that: The bottom wall of the heating storage has a bottom reflecting portion at least near the side opening of each side wall portion, and the bottom reflecting portion reflects the infrared rays emitted from the infrared emitting portion of each lower heating unit through the side transmitting portion and into the heating storage toward the heated object.

5. The grill according to claim 4, wherein: The bottom reflective portion is covered by a bottom transmissive portion that transmits the infrared rays.

6. The grill according to any one of claims 1 to 3, characterized in that: Each of the lower heating units is a surface combustion type burner having a combustion plate configured to emit the infrared rays by burning supplied fuel gas.

7. The grill according to any one of claims 1 to 3, characterized in that: Each of the lower heating units is a heater having a heating element, and the heating element radiates the infrared rays when supplied with electric power.

8. The grill according to claim 7, wherein: A side reflector is provided. The side reflector is arranged outside each of the side wall portions and reflects the infrared rays radiated from the heating element of the heater into the heating chamber.

9. A heating cooker, characterized in that: A grill according to any one of claims 1 to 3 is provided.

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