TW202537565A - Grills and heating cookers - Google Patents

Abstract

The present invention provides a grill (2) comprising: a heating chamber (20); a door (21); an upper heating unit (22) for heating the upper surface of an object to be heated; a pair of lower heating units (23) respectively disposed on the outer side of a pair of side walls (203), having an infrared radiating part (230) that radiates infrared rays from the outer side of each side wall (203) into the heating chamber (20) to heat the lower surface or side of the object to be heated; and The exhaust pipe (30) supplies exhaust gas from the heating chamber (20) to the outside of the heating chamber (20) through the exhaust port (301). Each side wall (203) has a side opening (24) in the area facing the infrared radiator (230) of each lower heating unit (23). The side opening (24) is covered by a side transmission section (26) through which infrared rays emitted from the infrared radiator (230) of each lower heating unit (23) pass.

Description

Grill and heating cooker

This invention relates to a grill and a heating cooker having said grill.

A conventional heating cooker is known to have a grill rack with a pair of bottom-burner burners, each consisting of a Bunsen burner, mounted on the lower inner side of the left and right side walls of the heating chamber. In this heating cooker, the lower surface or side of the object being heated is heated by combustion exhaust gases ejected from the flame holes of the bottom-burner into the center of the left and right sides of the heating chamber. Furthermore, 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 provided above and below the air inlets located at the lower part of each side wall. Furthermore, secondary air is guided from the outside of the heating chamber to the periphery of the flame holes of each lower burner through each secondary air guide plate, and the combustion exhaust gas ejected from the flame holes flies to the left and right central parts of the heating chamber through the secondary air flow (for example, Japanese Patent Publication No. 2015-19827).

However, when using a grill for heating and cooking, oil and fumes from the food will scatter inside the heating chamber, causing contamination. Therefore, users need to clean the heating chamber regularly.

However, in the aforementioned conventional grills, there are more components protruding into the heating chamber, such as the bottom burner and secondary air guide plate. As a result, it is difficult for users to reach the areas that need cleaning, leading to poor cleaning performance.

The purpose of this invention is to provide a grill with excellent cleaning properties for use in heated storage rooms and a heating cooker having said grill.

According to the present invention, a grill is provided, comprising: 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 for receiving an object to be heated; a door capable of opening and closing the front opening of the heating chamber from the front; a pair of lower heating units, each arranged outside one of the pair of side walls of the heating chamber, and having an infrared radiating section that radiates infrared rays from the outside of each of the side walls into the heating chamber to heat the lower surface or side of the object to be heated; and An exhaust duct is provided, connected to the heating chamber, and forming an exhaust passage communicating with an exhaust port for discharging exhaust gas from inside the heating chamber to the outside. Each side wall has a side opening in the area facing the infrared radiator of each lower heating unit. The side openings of each side wall are covered by side-transmitting portions, which allow infrared radiation emitted from the infrared radiator of each lower heating unit to pass through.

According to the present invention, a grill with excellent cleanability can be provided for use in heated storage rooms.

(Implementation Method 1)

The heating cooker with the grill involved in this embodiment will be specifically described below with reference to the accompanying drawings.

Figure 1 is a schematic perspective view showing an example of a heating cooker adapted to a built-in gas stove according to this embodiment. Figure 2 is a schematic perspective view of the main part of the grill. Figure 3 is a schematic perspective view of the main part of the lower portion of the grill. Figure 4 is a schematic longitudinal sectional view of the main part around the grill. Figure 5 is a schematic cross-sectional view of the main part around the grill. The gas stove 1 includes: a plurality of cooktop burners 3 facing upward from the cooktop opening (not shown) on the top plate 11; and a grill 2 assembled within the cooktop body 10, which serves as the main body of the heating cooker.

The grill 2 includes: a rectangular box-shaped heating chamber 20, which has an upper wall 202, a pair of left and right side walls 203, 204, a bottom wall 204, a rear wall 205, and a front opening 200; and a door 21, which can be opened and closed from the front to close the front opening 200 of the heating chamber 20. In addition, in this specification, the side of the door 21 is regarded as the front side. When observing the gas stove 1 from the side of the door 21, the direction in which the door 21 faces the inside of the heating chamber 20 is called the front-back direction, the width direction of the heating chamber 20 is called the left-right direction, and the height direction of the heating chamber 20 is called the up-down direction.

The heating chamber 20 houses cooking utensils made of metal or ceramic, such as a grill plate 4 (made of aluminum with excellent thermal conductivity), a grill rack (not shown), a steamer, or a cast iron pot (Dutch oven). During cooking, the food to be cooked, F, is placed on or contained within these cooking utensils and heated. Therefore, in this embodiment, the grill plate 4 and the food to be cooked, F, constitute the heated object.

The door 21 is connected to and supported on the cooktop body 10 by sliding back and forth. Although not shown, a connecting plate extends into the heating chamber 20 from the lower rear of the door 21. A support frame for the appliance support 40, which supports the grill plate 4 from below, is connected to the connecting plate. Thus, by pulling the door 21 forward, the grill plate 4 is pulled out to the front of the heating chamber 20; by pushing the door 21 backward, the grill plate 4 is housed inside the heating chamber 20. Furthermore, to avoid complexity, the appliance support 40 is omitted in Figures 4 and 5.

An upper-fired burner (upper heating unit) 22 is installed on the upper wall 202 of the heating chamber 20. The upper-fired burner 22 is a surface-fired, fully primary burner with a ceramic combustion plate 220 forming its lower surface. Multiple flame holes are formed over approximately the entire lower surface of the combustion plate 220. Although not shown, a spark plug that discharges electricity when a high voltage is applied from an igniter and a thermocouple that serves as a flame detection sensor are provided behind the combustion plate 220 of the upper-fired burner 22. When the upper-fired 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 burner plate 220 of the top-fired burner 22 into the lower part of the heating chamber 20, and infrared radiation is emitted. The heat of the combustion exhaust gas and the radiant heat of the infrared radiation are used to mainly heat the grill plate 4 and the upper surface of the food F placed on the grill plate 4. The top-fired burner 22 has a venturi section 221 at its rear, which extends to the right and outer side from the upper wall 202 of the heating chamber 20. Although not shown, a gas nozzle is inserted into the opening at the outer end of the venturi section 221. Therefore, when the fuel gas is ejected from the gas nozzle into the opening of the venturi section 221, the fuel gas and the air around the opening are drawn into the venturi section 221 together, generating a mixture of fuel gas and primary air, which is then supplied to the combustion plate 220.

On the left and right side walls 203, 203 of the heating chamber 20, there are respectively longer side openings 24, 24 in the front-to-back direction. The side openings 24, 24 have a larger dimension in both the vertical and front-to-back directions than the combustion plates 230, 230 of the lower-fire burners 23, 23 (described later). In addition, the side openings 24, 24 are covered by infrared-transmitting side-transmitting portions 26, 26 in a manner that is substantially coplanar with the side walls 203, 203. Therefore, the side-transmitting 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 side wall portions 203, 203 with side light transmission portions 26, 26, the left and right inner wall surfaces of the heating chamber 20 are formed into substantially flat surfaces. The side light transmission portions 26, 26 can be made of heat-resistant materials such as crystalline glass with excellent infrared transmittance. Additionally, the side light transmission portions 26, 26 can also undergo surface treatments such as oil-resistant treatment.

On the outer sides of the left and right side walls 203, 203 of the heating chamber 20, a pair of lower burners (lower heating units) 23, 23 extending along the left and right side walls 203, 203 in the front-back direction are respectively provided. In addition, the left and right lower burners 23, 23 have the same structure except that they are symmetrical. Therefore, the structure of the lower burners 23, 23 and their surroundings will be explained with one lower burner 23 as an example.

The lower burner 23 has a generally rectangular shape that is longer in the front-to-back direction. The lower burner 23 is arranged with its short side approximately vertical. Like the upper burner 22, the lower burner 23 is a surface-burning, fully primary burner with its side surface of the side wall 203 consisting of a ceramic combustion plate 230. Although not shown, behind the combustion plate 230 of the lower burner 23, there is a spark plug that discharges electricity when a high voltage is applied from the igniter; and a thermocouple that serves as a flame detection sensor to detect the presence or absence of a flame. When the lower burner 23 is ignited, a flame is formed on the entire side of the burner plate 230, and combustion exhaust is ejected to the side wall 203, while also radiating infrared rays. Furthermore, the combustion exhaust ejected from the burner plate 230 of the lower burner 23 is blocked by the aforementioned side-penetrating portion 26, while the infrared rays emitted from the burner plate 230 of the lower burner 23 are radiated into the heating chamber 20 through the side-penetrating portion 26. As a result, the radiant heat of the infrared rays primarily heats the grill plate 4 and the lower surface or side of the food F placed on the grill plate 4. Therefore, in this embodiment, the burner plate 230 of the lower burner 23 constitutes an infrared radiating portion. The bottom burner 23 has a rearwardly extending venturi section 231 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 and the surrounding air are drawn into the venturi section 231 together, generating a mixture of fuel gas and primary air, which is then supplied to the combustion plate 230. Alternatively, the bottom burner 23 can be arranged in an inclined position with its upper end positioned further outward than its lower end, such that the combustion plate 230 faces the lower surface of the grill plate 4.

An exhaust pipe 30, communicating with the cooking space inside the heating chamber 20, is connected to the rear wall 205 of the heating chamber 20. The exhaust pipe 30 may also be connected to the upper wall 202 of the heating chamber 20. The exhaust pipe 30 is connected to an upper exhaust port 301, which allows exhaust gases, including combustion exhaust or fumes from food, to be discharged to the outside of the gas stove 1. Therefore, the exhaust pipe 30 constitutes an exhaust passage 300. The exhaust pipe 30 extends obliquely upward from the upper part of the rear wall 205 of the heating chamber 20 toward the lower surface of the top plate 11. The exhaust port 301 faces from below an opening 14 for a grill provided on the upper surface of the top plate 11. Additionally, on the left and right sidewalls (not shown) of the exhaust duct 30, there are duct openings 310 that open outwards (see Figure 3). The duct openings 310 are connected to the auxiliary openings 530 of the auxiliary duct section 53 of the cover 5, which will be described later.

As shown in Figures 2, 3, and 5, a cover 5 is provided on the outer side of the side wall portion 203 of the heating chamber 20. The cover 5 covers the area where the combustion plate 230 of the downfire burner 23 is formed from the outside at a predetermined distance. The cover 5 is connected to the side wall portion 203 of the heating chamber 20 at a predetermined location on the periphery of the side wall portion 203. Therefore, a recessed chamber is formed on the outer side of the side wall portion 203 of the heating chamber 20, recessed towards the outer side of the heating chamber 20. Furthermore, a receiving portion 51 is formed by dividing the side wall portion 203, which has the side passage portion 26 of the heating chamber 20, and the front portion of the cover 5 disposed outside the side wall portion 203. This receiving portion 51 accommodates the burner plate 230 of the bottom burner 23, which is separate from the cooking space inside the heating chamber 20. Alternatively, the cover 5 can also be connected from the upper wall portion 202 or the bottom wall portion 204.

The cover 5 has an upper wall 511, a lower wall 512, a front wall 513, a rear wall 514, and a side wall 515 forming the receiving portion 51. Furthermore, a narrow, slit-like lower opening 510 (first opening) is formed on the lower wall 512 forming the lower region of the cover 5. Additionally, a rectangular rear opening 520 (second opening) is formed on the upper part of the rear wall 514 forming the rear region of the cover 5. Moreover, the cover 5 has an auxiliary conduit portion 53 extending rearward from the periphery of the rear opening 520. The auxiliary conduit portion 53 has an auxiliary upper wall 531, an auxiliary lower wall 532, an auxiliary rear wall 533, and an auxiliary side wall 534. Additionally, the auxiliary duct section 53 has an auxiliary opening section 530 that opens toward the exhaust duct 30. This auxiliary opening section 530 is connected to the duct opening section 310 of the exhaust duct 30. Therefore, the interior space of the housing 51 is connected to the exhaust duct 30 via the rear opening 520 or the auxiliary duct section 53.

When the lower burner 23 is ignited, combustion exhaust gas ejected from the burner plate 230 of the lower burner 23 is ventilated through the rear opening 520 to the exhaust pipe 30. Therefore, the interior of the enclosure 5 becomes negative pressure, and air from inside the cooktop body 10 is drawn into the housing 51 of the enclosure 5 through the lower opening 510. Furthermore, when the upper burner 22 is ignited, exhaust gas containing combustion exhaust gas from the heating chamber 20 is ventilated through the exhaust pipe 30 to the outside of the gas stove 1. Therefore, the interior of the enclosure 5, connected to the exhaust pipe 30 via the auxiliary pipe section 53, becomes further negative pressure, increasing the ventilation effect. Thus, the air inside the main body 10 of the stove is smoothly guided into the receiving portion 51 of the cover 5 through the lower opening 510. Then, the air guided into the receiving portion 51 of the cover 5, along with the combustion exhaust gas ejected from the burner plate 230 of the lower burner 23, is discharged into the exhaust pipe 30 through the rear opening 520 and the auxiliary pipe portion 53, and then, together with the exhaust gas in the heating chamber 20, is discharged to the outside of the gas stove 1 through the exhaust port 301. As a result, a flow path for cooling air connected to the exhaust pipe 30 is formed inside the cover 5 through the receiving portion 51, the rear opening 520, and the auxiliary pipe portion 53 from the lower opening 510. Thus, the side-penetrating portion 26 facing the burner plate 230 can be effectively cooled. Furthermore, the combustion exhaust gas from the lower burner 23 is difficult to leak into the cooktop body 10 through the cover 5. As a result, the intake of combustion exhaust gas from the opening of the venturi section 231 of the lower burner 23 and the opening of the venturi section 221 of the upper burner 22 is also reduced. Therefore, poor combustion in the lower burner 23 and the upper burner 22 can also be suppressed. In addition, if the rear opening 520 is located above the lower opening 510, multiple lower openings 510 and rear openings 520 can be provided respectively. Furthermore, the rear opening 520 is preferably located behind the lower opening 510. Additionally, the lower opening 510 can be located in the front area of the cover 5 (e.g., the lower part of the front wall 513 or the side wall 515), or it can be located in both the lower and front areas. Similarly, the rear opening 520 can be located in the upper area of the cover 5 (e.g., the upper part of the upper wall 511 or the side wall 515), or it can be located in both the rear and upper areas.

A bottom reflector 60 is preferably formed on the upper surface of the bottom wall portion 204 of the heating chamber 20. Infrared rays from the downfire burner 23 that are emitted into the heating chamber 20 through the side transmission portion 26 are reflected onto the lower surface of the grill plate 4 through the bottom reflector 60. The bottom reflector 60 can be formed, for example, by laminating a metal plate such as aluminum with high reflectivity onto the bottom wall portion 204. Alternatively, the bottom wall portion 204 can also be formed of BA (Bright Annealed) material. Furthermore, when forming the bottom reflector 60, it is preferable that the bottom reflector 60 is provided at least near the side opening portion 24 in a range corresponding to the length of the burner plate 230 of the downfire burner 23 in the front-to-back direction.

The upper surface of the bottom reflector 60 is preferably covered by the bottom transmission portion 61. The bottom transmission portion 61 is formed, for example, by layering a heat-resistant material made of crystallized glass on top of the bottom reflector 60. By covering the upper surface of the bottom reflector 60 with the bottom transmission portion 61, infrared rays from the downfire burner 23 that are emitted into the heating chamber 20 through the side transmission portion 26 are reflected by the bottom reflector 60. In addition, cleanability is improved. The upper surface of the bottom reflector 60 can also be treated with a surface treatment such as an oil-resistant treatment.

As explained in detail above, in the grill 2 of this embodiment, the bottom-fired burner 23 is separated from the cooking space inside the heating chamber 20 by a side passage 26. Therefore, it prevents grease, fumes, and other contaminants from adhering to the bottom-fired burner 23 and its surrounding components. Furthermore, according to this embodiment, the number of components protruding into the heating chamber 20, such as the bottom-fired burner 23 and the secondary air guide plate, can be reduced. Thus, a grill 2 with excellent cleanability inside the heating chamber 20 can be provided.

Furthermore, in conventional heating chambers equipped with bottom-fired burners and grills with air inlets on the side walls, during heating and cooking, grease, fumes, and other pollutants escaping from the food can partially block the flame holes of the bottom-fired burner or partially block the air inlets on the side walls. This causes the flame shape to collapse or reduces the amount of secondary air introduced into the heating chamber. Consequently, combustion exhaust cannot adequately reach the left and right centers of the heating chamber, easily reducing heating performance. However, according to this embodiment, the burner plate 230 of the bottom-fired burner 23 is separated from the cooking space within the heating chamber 20 by a side passage 26. Therefore, it is possible to reliably prevent dirt from adhering to the bottom-fired burner 23 during heating and cooking. Furthermore, according to this embodiment, due to the improved cleanability within the heating chamber 20, the reduction in heating performance caused by fouling in the side passage 26 can also be suppressed. Thus, stable heating performance can be ensured over a long period.

Furthermore, in the grill rack of a conventional Bunsen burner used in a bottom-fired burner, the flame extends roughly horizontally from the flame hole into the inner side of the heating chamber. Secondary air from air inlets located on the side walls causes the combustion exhaust to flow along the direction of the flame. This easily leads to interference between the flame and cooking utensils, and the combustion of the Bunsen burner tends to deteriorate. Additionally, the heating of the combustion exhaust in a Bunsen burner is highly directional. Therefore, when using cooking utensils such as grill plates or cast iron pots, the areas where the combustion exhaust is easily impacted are hotter than the areas where it is less likely to impact. As a result, the cooking utensils tend to have uneven temperature distribution, and the heated food is heated unevenly. Therefore, not only is the heating performance poor, but localized deterioration of the cooking utensils is also prone to occur. However, according to this embodiment, a surface-burning downburner 23 with a burner plate 230 that forms a short flame and radiates infrared rays is used. In addition, the combustion exhaust gas ejected from the downburner 23 is blocked by the side-penetrating portion 26. Therefore, the cooking utensils are heated by radiant heat of infrared rays that diffuse radially. Therefore, the deterioration of combustion in the downburner 23 can be suppressed. In addition, compared with the case of using a Bunsen burner, the temperature distribution of the cooking utensils is suppressed. As a result, the heated object can be heated evenly, and excellent heating performance can be obtained. Furthermore, since the flame or combustion exhaust of the bottom burner 23 does not come into contact with the cooking utensils, it can also suppress localized deterioration of the cooking utensils and improve their durability.

Furthermore, according to this embodiment, a cooling air flow path is formed within the cover 5, which has a lower opening 510 and a rear opening 520. Therefore, the side-permeable portion 26 can be cooled. This suppresses the temperature rise of the side-permeable portion 26 and improves durability. In particular, according to this embodiment, the cover 5 is connected to the exhaust pipe 30. Therefore, cooling air can easily flow within the cover 5, thereby cooling the side-permeable portion 26.

Furthermore, according to this embodiment, the lower surface of the object being heated can be effectively heated using infrared rays reflected by the bottom reflector 60. This improves heating performance.

Furthermore, according to this embodiment, the cleanability of the bottom wall portion 204 of the heating chamber 20 can be improved by utilizing the bottom transparent portion 61 covering the upper surface of the bottom reflective portion 60.

(Implementation Method 2)

The grill of this embodiment, as a lower heating unit, has the same structure as the grill of embodiment 1, except that it uses an infrared-emitting heater instead of a lower burner. Therefore, the same reference numerals are used for the same structure as in embodiment 1, and the descriptions are omitted; the differences are mainly explained.

As shown in Figures 6-8, similar to Embodiment 1, the heating chamber 20 of the grill 2a in this embodiment has long side openings 24, 24 on its left and right side walls 203, 203, which are longer in the front-to-back direction. The side openings 24, 24 have dimensions larger than the heating elements 230b, 230b of the heaters 23a, 23a (described later) in both the vertical and front-to-back directions. Furthermore, the side openings 24 are covered by infrared-transmitting side-transmitting portions 26, 26, which are substantially coplanar with the side walls 203, 203. The side-transmitting portions 26, 26 face the heating elements 230b, 230b of the heaters 23a, 23a in the left-to-right direction.

On the outer sides of the left and right side walls 203, 203 of the heating chamber 20, a pair of heaters 23a, 23a extending along the front-rear direction of the side walls 203, 203 are respectively provided. Furthermore, the left and right heaters 23a, 23a have the same structure except for being symmetrical. Therefore, the structure of the heaters 23a, 23a and their surroundings will be explained using a single heater 23a as an example.

The heater 23a includes: a cylindrical section 230a extending along the side wall 203 in the front-to-back direction; and a heating element 230b housed within the cylindrical section 230a. The cylindrical section 230a may be, for example, a heat-resistant tube made of crystallized glass with excellent infrared transmittance or ceramic with high far-infrared emissivity. The heating element 230b may be, for example, a graphite film obtained by heat-treating a polymer film to which conventionally known polymer films or fillers have been added.

Both ends of the cylindrical section 230a are sealed. The cylindrical section 230a is filled with inert gases such as nitrogen and argon. Although not shown, one end of a lead wire is connected to each end of the heating element 230b. The other end of the lead wire extends outward from the cylindrical section 230a. By supplying power to the lead wire, current flows through the heating element 230b, generating heat through the resistance of the heating element 230b. At this time, infrared radiation is emitted from the heating element 230b. Furthermore, the radiant heat from the infrared radiation emitted into the heating chamber 20 through the side-penetrating portion 26 primarily heats the grill plate 4 and the lower surface or side surface of the food F placed on the grill plate 4. Therefore, in this embodiment, the heating element 230b constitutes an infrared radiating portion.

A cover 5a is provided on the outer side of the side wall portion 203 of the heating chamber 20. The cover 5a covers the area where the heating element 230b of the heater 23a is formed from the outside at a predetermined distance. The cover 5a is connected to the side wall portion 203 of the heating chamber 20 at a predetermined part of its periphery. Therefore, a receiving portion 51a is formed by dividing the side wall portion 203 where the side passage portion 26 of the heating chamber 20 is provided and the cover 5a disposed on the outer side of the side wall portion 203. The receiving portion 51a receives the heating element 230b of the heater 23a, which is separate from the inside of the heating chamber 20.

The cover 5a has a semi-cylindrical side wall 515a forming a receiving 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. On the lower wall 512a forming the lower region of the cover 5a, a plurality of rectangular lower openings 510a (first openings) opening downwards at predetermined intervals in the front-to-back direction are formed. Furthermore, on the upper part of the rear wall 514a forming the rear region of the cover 5a, a rectangular rear opening 520a (second opening) opening backwards is formed. Furthermore, the cover 5a has an auxiliary duct portion 53a extending rearward from the periphery of the rear opening 520a. The auxiliary duct portion 53a has an auxiliary upper wall 531a, an auxiliary lower wall 532a, an auxiliary rear wall 533a, and an auxiliary side wall 534a. In addition, the auxiliary duct portion 53a has an auxiliary opening portion 530a that opens toward the exhaust duct 30. This auxiliary opening portion 530a is connected to the duct opening portion 310 of the exhaust duct 30, similar to Embodiment 1. Therefore, the internal space of the receiving portion 51a of the cover 5a is connected to the exhaust duct 30 via the rear opening 520a or the auxiliary duct portion 53a.

A side reflector 63 is preferably formed on the inner wall surface of the side wall 515a that protrudes outward from the outer side of the housing 5a. Infrared rays emitted from the heater 23a are reflected into the heating chamber 20 through the side reflector 63. Similar to the bottom reflector 60 of Embodiment 1, the side reflector 63 may be formed, for example, by laminating a metal plate such as aluminum with high infrared reflectivity onto the side wall 515a. Alternatively, the side wall 515a may also be formed of BA material.

When electricity is supplied to the heater 23a and the heating element 230b heats up, a ventilation effect is created, causing the hot air generated by the heating element 230b of the heater 23a to be discharged from the rear opening 520a to the exhaust pipe 30. Therefore, a negative pressure is created inside the enclosure 5a, and air from inside the cooktop body 10 is drawn into the receiving portion 51a of the enclosure 5a through the lower opening 510a. Furthermore, when the top burner 22 is ignited, a ventilation effect is created, causing exhaust gas containing combustion exhaust from the heating chamber 20 to be discharged to the outside of the gas stove 1 through the exhaust pipe 30. Therefore, the enclosure 5a, connected to the exhaust pipe 30 via the auxiliary pipe section 53a, is further under negative pressure, increasing the ventilation effect. Thus, the air inside the main body 10 of the stove is smoothly guided into the receiving portion 51a of the cover 5a through the lower opening 510a. Then, the air guided into the receiving portion 51a of the cover 5a, together with the hot air generated from the heating element 230b of the heater 23a, is discharged into the exhaust pipe 30 through the auxiliary pipe portion 53a, and together with the exhaust gas in the heating chamber 20, is discharged to the outside of the gas stove 1 through the exhaust port 301. As a result, a flow path of cooling air is formed inside the cover 5a from the lower opening 510a through the receiving portion 51a, through the rear opening 520a and the auxiliary pipe portion 53a, and connected to the exhaust pipe 30. Therefore, the heater 23a itself and the side passage 26 facing the cylinder portion 230a of the heater 23a can be effectively cooled.

As in Embodiment 1, a bottom reflector 60 is preferably formed on the upper surface of the bottom wall portion 204 of the heating chamber 20. This bottom reflector 60 reflects infrared rays from the heater 23a that are emitted into the heating chamber 20 through the side transmission portion 26 toward the lower surface of the grill plate 4. Furthermore, as in Embodiment 1, the upper surface of the bottom reflector 60 is preferably covered by the bottom transmission portion 61.

As explained in detail above, the grill 2a according to this embodiment, similar to that in Embodiment 1, has its heater 23a separated from the cooking space inside the heating chamber 20 by a side passage 26. Therefore, it is possible to prevent grease, fumes, and other contaminants from adhering to the heater 23a and its surrounding components. Furthermore, according to this embodiment, the number of components protruding into the heating chamber 20 can be reduced. Thus, a grill 2a with excellent cleanability inside the heating chamber 20 can be provided.

Furthermore, according to this embodiment, the cleanability of the heating chamber 20 can be improved. Therefore, the reduction in heating performance caused by fouling in the side ventilation section 26 can also be suppressed. As a result, stable heating performance can be ensured over a long period of time.

Furthermore, according to this embodiment, cooking appliances can be heated by radiant heat from infrared rays that diffuse radially. Therefore, compared to using a Bunsen burner, the temperature distribution of the cooking appliance is suppressed. This allows for uniform heating of the object being heated, resulting in excellent heating performance. Additionally, only infrared rays are emitted from the heater 23a. Therefore, localized deterioration of the cooking appliance can be suppressed, and the durability of the cooking appliance can be improved.

Furthermore, according to this embodiment, the object to be heated can be effectively heated using infrared rays emitted from the heater 23a via the side reflector 63. This improves heating performance. In particular, since the semi-cylindrical side reflector 63 covers the outer side of the heater 23a, radially diffused infrared rays can be reflected upwards, downwards, and outwards from the heater 23a into the heating chamber 20.

(Other implementation methods)

(1) In the above embodiment, a lower heating unit that emits infrared rays is used. However, in this invention, a lower heating unit that emits far-infrared rays may also be used.

(2) In the above embodiment, an all-primary combustion burner is used as the upper heating unit. However, in this invention, other burners or heaters may also be used as the upper heating unit.

(3) In the above embodiment, the cover is provided in such a way that it covers a part of the lower heating unit including the infrared irradiation part from the outside. However, in the present invention, the cover may also be provided in such a way that it covers the entire lower heating unit from the outside.

The invention has been described in detail above, but it can be summarized as follows.

According to a first aspect of the present invention, a grill is provided, comprising: 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 for receiving an object to be heated; a door capable of opening and closing the front opening of the heating chamber from the front; a pair of lower heating units, each disposed on the outer side of one of the pair of side walls of the heating chamber, and having an infrared radiating section that radiates infrared rays from the outer side of each of the side walls into the heating chamber to heat the lower surface or side of the object to be heated; and An exhaust duct is provided, connected to the heating chamber, and forming an exhaust passage communicating with an exhaust port for discharging exhaust gas from inside the heating chamber to the outside. Each side wall has a side opening in the area facing the infrared radiator of each lower heating unit. The side openings of each side wall are covered by side-transmitting portions, which allow infrared radiation emitted from the infrared radiator of each lower heating unit to pass through.

According to the first method described above, the lower heating unit is separated from the cooking space inside the heating chamber by a side passage. Therefore, it prevents grease, fumes, and other contaminants from adhering to the lower heating unit and its surrounding components. Furthermore, according to the first method described above, the number of components protruding into the heating chamber can be reduced. This improves the cleanability of the heating chamber.

According to a second aspect of the present invention, in the first aspect described above, a pair of covers are provided, each covering the infrared radiating portion of a pair of lower heating units from the outside. Each of the pair of covers has: a first opening located in the lower or front region of each cover and near a side opening on the side wall; and a second opening located in the upper or rear region of each cover and positioned above the first opening.

According to the second method described above, the ventilation effect generated during heating by the lower heating unit creates a negative pressure inside the enclosure. As a result, a flow path is formed inside the enclosure for cooled air that enters from outside through the first opening and exits to the outside through the second opening. This cools the side-permeable portion, suppresses temperature rise in the side-permeable portion, and improves durability.

According to a third aspect of this technology, in the second aspect described above, each of the enclosures is configured to be connected to the exhaust duct via the second opening. During heating and cooking, a ventilation effect is created in the exhaust duct, allowing exhaust gas from the heating chamber to be discharged outside the heating chamber. Furthermore, according to the third aspect, since each enclosure is connected to the exhaust duct via the second opening, air inside the enclosure is discharged to the exhaust duct via the second opening. Therefore, the negative pressure inside the enclosure increases, and the ventilation effect is enhanced. Consequently, cooling air flows more easily into the enclosure, thereby cooling the side-permeable portion.

According to a fourth aspect of the present technology, in any of the first to third aspects described above, the bottom wall portion of the heating chamber has a bottom reflective portion near at least the side opening of each of the side walls, the bottom reflective portion causing infrared rays emitted from the infrared radiating portions of each of the lower heating units through the side radiating portions into the heating chamber to be reflected toward the object being heated.

According to the fourth method described above, the lower surface of the object being heated can be effectively heated using infrared rays reflected by the bottom reflector. This improves heating performance.

According to a fifth aspect of this technology, in the fourth aspect described above, the bottom reflective portion is covered by a bottom transparent portion through which the infrared light passes.

According to the fifth method mentioned above, the cleanability of the bottom wall of the heating chamber can be improved.

According to a sixth aspect of the present technology, in any of the first to fifth aspects described above, each of the lower heating units is a surface combustion burner with a combustion plate that emits the infrared radiation by burning the supplied fuel gas.

According to the sixth method mentioned above, a gas grill with excellent cleaning performance can be provided.

According to the seventh aspect of this technology, in any of the first to fifth aspects described above, each of the lower heating units is a heater having a heating element that emits the infrared rays by being supplied with electricity.

According to the seventh method mentioned above, an electric grill with excellent cleaning performance can be provided.

According to an eighth aspect of the present technology, in the seventh aspect described above, a lateral reflector is provided, the lateral reflector being disposed on the outer side of each of the sidewall portions, so that the infrared rays emitted from the heating element of the heater are reflected into the heating chamber.

According to the eighth method described above, the object being heated can be effectively heated using infrared rays emitted from the heating element of the heater. As a result, heating performance can be improved.

According to the ninth aspect of this technology, a heating cooker with a grill having any of the first to eighth aspects described above is provided.

According to the ninth method mentioned above, a heating cooker equipped with a grill that is easy to clean can be provided.

1: Gas Stove 2: Grill Rack 2a: Grill Rack 3: Stove Burner 4: Grill Plate 5: Cover 5a: Cover 10: Main Stove Body 11: Top Plate 14: Grill Rack Opening 20: Heating Chamber 21: Door 22: Upper Burner 23: Lower Burner 23a: Heater 24: Side Opening 26: Side Transmission Section 30: Exhaust Pipe 51: Reception Section 51a: Reception Section 53: Auxiliary Pipe Section 53a: Auxiliary Pipe Section 60: Bottom Reflector 61: Bottom Transmission Section 63: Side Reflector 200: Front Opening 202: Upper Wall Section 203: Side wall 204: Bottom wall 205: Rear wall 220: Burner plate 221: Venturi tube section 230: Burner plate 230a: Cylinder section 230b: Heating element 231: Venturi tube section 300: Exhaust passage 301: Exhaust port 310: Pipe 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

Figure 1 is a schematic perspective view showing an example of the heating cooker according to Embodiment 1 of the present invention. Figure 2 is a schematic perspective view showing the main parts of an example of the grill according to Embodiment 1 of the present invention. Figure 3 is a schematic perspective view showing the main parts of an example of the lower part of the grill according to Embodiment 1 of the present invention. Figure 4 is a schematic longitudinal sectional view showing the main parts of an example of the grill according to Embodiment 1 of the present invention. Figure 5 is a schematic cross-sectional view showing the main parts of an example of the grill according to Embodiment 1 of the present invention. Figure 6 is a schematic perspective view showing the main parts of an example of the lower part of the grill according to Embodiment 2 of the present invention. Figure 7 is a schematic longitudinal sectional view showing the main parts of an example of the grill according to Embodiment 2 of the present invention. Figure 8 is a schematic cross-sectional view of the main parts of an example of the grill according to Embodiment 2 of the present invention.

1: Gas stove

2: Grill

3: Stove burner

4: Grill rack

11: Roofing board

14: Grill grill opening

20: Heated Storage

21: Door Body

22: Top-lit burner

23: Bottom-fired burner

24: Side opening

26: Side Transmission Section

30: Exhaust pipe

60: Bottom reflector

61: Bottom Transmission Section

200: Front opening

202: Upper wall section

203: Side wall part

204: Bottom wall

205: Posterior wall portion

220: Combustion Board

230: Combustion board

300: Exhaust passage

301: Exhaust port

F: The ingredient to be cooked

Claims (9)

A grill, characterized in that it comprises: 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 for receiving food to be heated; a door capable of opening and closing the front opening of the heating chamber from the front; a pair of lower heating units, each disposed on the outer side of one of the pair of side walls of the heating chamber, and having an infrared radiating section that radiates infrared rays from the outer side of each of the side walls into the heating chamber to heat the lower surface or side surface of the food to be heated; and An exhaust duct is provided, connected to the heating chamber, and forming an exhaust passage communicating with an exhaust port for discharging exhaust gas from inside the heating chamber to the outside. Each side wall has a side opening in the area facing the infrared radiator of each lower heating unit. The side openings of each side wall are covered by side-transmitting portions, which allow infrared radiation emitted from the infrared radiator of each lower heating unit to pass through. The grill according to claim 1 is characterized in that, it further comprises a pair of covers, each of the covers externally covering the infrared radiating portions of the pair of lower heating units; each of the covers has: a first opening located in the lower or front region of each cover and near a side opening on the side wall of each cover; and a second opening located in the upper or rear region of each cover and positioned above the first opening. The grill according to claim 2 is characterized in that, each of the enclosures is configured to communicate with the exhaust duct via the second opening. A grill according to any one of claims 1 to 3, characterized in that: the bottom wall of the heating chamber has a bottom reflector near at least the side openings of each of the side walls, the bottom reflector causing infrared rays emitted from the infrared radiators of each of the lower heating units through the side radiators into the heating chamber to reflect back onto the object being heated. The grill according to claim 4 is characterized in that, the bottom reflective portion is covered by a bottom transparent portion through which the infrared light passes. The grill according to any one of claims 1 to 3 is characterized in that, each of the lower heating units is a surface-burning burner with a combustion plate that emits the infrared radiation by burning the supplied fuel gas. The grill according to any one of claims 1 to 3 is characterized in that: each of the lower heating units is a heater having a heating element that emits the infrared rays by being supplied with electricity. The grill according to claim 7 is characterized in that it has lateral reflectors disposed on the outer side of each of the sidewall portions, such that infrared rays emitted from the heating element of the heater are reflected into the heating chamber. A heating cooker, characterized in that it has a grill as described in any one of claims 1 to 3.