JP7791797B2 - heating cooker - Google Patents

Description

The present invention relates to a cooking device equipped with a grill chamber.

Generally, grill chambers are designed to heat both sides of food (such as fish) simultaneously, using heat sources such as sheath heaters or gas burners placed above and below the food.

In addition to grilling, in which food is heated by radiant heat from the heat source, the heating chamber of this grill cabinet also controls the temperature inside the heating chamber to perform oven cooking for a variety of dishes, such as pizza, sweets, and cakes. As a result, grill cabinets are being used more frequently and for longer periods of time at high temperatures. The heating chamber of the grill cabinet is equipped with a temperature sensor such as a thermistor, and temperature control is performed based on the value detected by the temperature sensor.

The grill chamber has an opening on the front side of the cooking appliance, and a door is provided to cover this opening. For heat resistance and design reasons, the door typically has a glass panel on the front, which acts as a viewing window, with sheet metal arranged to avoid the viewing window and leave the interior hollow.

When placing food in the heating chamber, the user opens it by pulling a handle on the door. When cooking in the grill chamber, the heat supplied to the heat source causes the temperature inside the chamber to rise to over 200°C, which in turn causes the temperature of the door to rise. The outer surface temperature of the glass panel of the door can reach high temperatures of over 100°C, but the handle that the user touches when opening and closing the door needs to be kept from rising in temperature. Typical handles have a handle that protrudes forward from the glass panel on the front side of the door, or are located below the glass panel, making it difficult for heat to be transferred from the glass panel.

Patent Document 1, for example, discloses a technology for designing doors that harmonize with the system kitchen in which the cooking appliance is installed, which aims to reduce the temperature of the handle by not having the handle protrude forward from the glass plate. Patent Document 1 discloses a technology in which the door has a closed surface facing the opening of the cooking chamber (grill chamber) and a surface located on the front side of the kitchen counter, and is equipped with an insulating structure (insulating material 6c in Figure 3 of the document, or air layer 31 in Figure 4) that suppresses heat conduction from the closed surface side to the surface side.

JP 2017-40394 A

As mentioned above, the technology described in Patent Document 1 reduces the amount of heat transferred to the door by providing an insulating structure (insulating material 6c, air layer 31) in the gap between the door and the hot air inside the oven to suppress heat transfer from the hot air inside the oven to the door. As a result, as is clear from Figures 3 and 4 of the document, in a system kitchen with a specified depth, when the door is closed, the insulating structure provided on the heating chamber side of the door reduces the volume of the oven where cooking takes place, limiting the size of food that can be placed inside the oven.

Furthermore, because the distance from the door to the cooking chamber is long due to the thermal insulation structure, the door does not have a viewing window for directly checking the interior of the chamber, and the structure means that the interior can only be checked indirectly by photographing (see embodiment 4 of Patent Document 1), which raises concerns that intuitive response in an emergency such as a fire may be delayed.

Furthermore, the handle-shaped design element located above the door is located above the cooking chamber, in an area where hot air is likely to collect due to heat conduction caused by rising temperatures in the cooking chamber walls and heat leakage from the contact surface between the door and the cooking chamber, which can lead to insufficient cooling. The door's insulating structure is highly effective in reducing heat transfer, but the effectiveness of the insulating structure itself in lowering the temperature depends on the cooling performance of the door. In other words, the further behind the handle-shaped design element is located from the front decorative panel (door glass), the less likely natural convection will occur near the handle-shaped design element, and cooling air will not flow. This raises concerns about the handle-shaped design element's temperature rising due to insufficient cooling.

The object of the present invention is to solve the above-mentioned problems by minimizing the unevenness on the front side of the main body, preventing clothing and other items from getting caught during cooking, improving kitchen workability, and providing a cooking appliance with a grill compartment that is easy to design and clean.

To achieve the above objective, the present invention is characterized by a cooking appliance comprising a pot holder located on the top surface of the main body, a grill compartment located below the pot holder and in front of the main body, a control board, and a main fan unit for cooling the control board. The grill compartment has a heating chamber with an opening on the front, a heating means for heating the interior of the heating chamber, and a door covering the opening. The door has a box covering the opening and a handle unit located above the box. The handle unit has a handle portion formed by recessing a portion of its front surface toward the heating chamber, and is located closer to the heating chamber than the handle portion and has a cavity with multiple openings in the wall. A ventilation duct communicating with one of the multiple openings is located on the side of the grill compartment.

This invention provides a cooking appliance with a grill compartment that efficiently cools the handle, has minimal irregularities on the front side of the main body, and is well-designed and easy to clean.

1 is a perspective view of a cooking device according to a first embodiment of the present invention; FIG. 1 is a perspective cross-sectional view of the cooking device of the first embodiment when the door is open; 1 is an exploded perspective view of a cooking device according to a first embodiment of the present invention; A front cross-sectional view taken along line AA shown in FIG. A front cross-sectional view taken along line BB shown in FIG. A side cross-sectional view taken along line CC shown in FIG. A side cross-sectional view taken along line DD shown in Figure 1. Schematic diagram of the heating cooker of Example 1 seen from above. Modification of the first embodiment FIG. 10 is a perspective cross-sectional view of the cooking device of the second embodiment when the door is open. Schematic diagram of cooking in Example 2 seen from above FIG. 10 is a perspective view of the cooking device of the third embodiment when the door is open; Schematic diagram of a side cross-sectional view of a grill chamber of Example 3 Schematic diagram of a side cross-sectional view of a grill chamber of Example 4

An embodiment of the cooking appliance of the present invention will be described in detail, with reference to the drawings as appropriate. Note that, while a built-in induction cooking heater with a grill compartment will be used as an example of the cooking appliance below, the present invention can also be applied to freestanding induction cooking heaters and built-in or freestanding gas stoves as long as they are cooking appliances with a grill compartment.

First, the overall configuration of the cooking device 100 according to Example 1 of the present invention will be outlined, followed by a detailed description of the structure of the grill chamber 5.

<Overall configuration of cooking device 100>
The cooking appliance 100 of this embodiment is a cooking appliance equipped with an induction heating (IH) function that generates eddy currents in the bottom of a metal pot placed on the top surface and heats the metal pot itself with Joule heat due to the eddy currents, and a grill function that heats food stored in a heating chamber with radiant heat from a heater. Note that, as shown in Figure 1 etc., in the following, the front-back, up-down, and left-right directions are defined based on the line of sight of a user facing the cooking appliance 100.

The configuration of the cooking device 100 of this embodiment will be described below using Figures 1 to 3. Figure 1 is a perspective view of the cooking device 100, Figure 2 is a perspective cross-sectional view of the cooking device with the door open, and Figure 3 is an exploded perspective view of the cooking device 100. As shown in each figure, the cooking device 100 comprises a main body 1, a top plate 2, a heating coil 3, a base plate 7, and a base plate cover 4 that houses the base plate 7, and further includes a built-in grill chamber 5 to which the present invention is applied.

As shown in Figure 3, the main body 1 is a housing with an outer shell corresponding to the space (predetermined left-right width, front-back width, and height) in which the cooking appliance 100 will be installed, and is box-shaped (concave) with an open top. This main body 1 is provided with a grill compartment 5 on the lower left side, and the base plate 7 placed on the base stand 73 above the partition plate 1b covering the grill compartment 5, the lower casing 90b and impeller 91 that make up the main fan unit 9 are arranged flat, and the outlet, which is the outlet of the main fan unit 9, is positioned at a height that includes the surface of the base plate 7.

Here, the main fan unit 9 is a centrifugal fan composed of an impeller 91, casings 90a and 90b that sandwich the impeller 91 from above and below, and a motor 92 that passes through the casing 90a and connects to the impeller 91. In other words, the impeller 91 is housed in a space surrounded by the casing 90a, which houses the motor 92, and the casing 90b, which houses the intake duct 95, and is supported by the rotating shaft of the motor 92 so as not to come into contact with the casings 90a and 90b. Therefore, the main fan unit 9 has the rotating shaft of the impeller 91 aligned vertically with the main body 1, and blows out air drawn in from below toward the base plate 7.

This main fan unit 9 is positioned upstream of the circuit board 7, and by driving the motor 92, air is drawn in through the intake duct 95 and supplied to the heat sink 75 on the circuit board 7, which is covered by the circuit board cover 4. In addition, the heating coil 3, display unit P1, etc. are installed above the circuit board cover 4, and a top plate 2 is provided to cover it from above.

The electronic components 71 on the board 7 include integrated circuits, inverter circuits, capacitors, resistors, etc., which are used to supply high-frequency current to the heating coil 3 and drive the main fan unit 9. The board base 73 is an insulating member (resin member) for fixing the board 7, and is fixed to the inner wall or partition plate 1b of the main body 1.

The heating coil 3 is installed below the top plate 2, and a temperature sensor 34 that detects the temperature of the bottom of the pot is installed near its center. The heating coil 3 is also located downstream of the main fan unit 9, so that the cooling air blown out from the main fan unit 9 cools the board 7 below the board cover 4, and then cools the heating coil 3 via the outlet 40a at the front corner of the main body. The heating coil 3 is a coil through which a high-frequency current flows when driven by an inverter circuit, and is mounted on a coil base 31.

In this embodiment, one heating coil 3 is provided on the right, one on the left, and one at the rear center when viewed from above. The coil base 31 is supported by three supports 32 (e.g., springs), which apply an upward biasing force. This presses the heating coil against the underside of the top plate 2, maintaining a constant distance between the cooking pot and the heating coil 3.

The grill compartment 5 on the front left side of the main body 1 has an opening (not shown) that slides back and forth to place the food to be cooked (not shown), and a door 6 is provided to cover the opening. Also, on the front right side of the main body 1, there is a front panel 1a positioned so that it is roughly flat on the wide surface in front of the door 6, and a power switch P3 for turning the main power on and off. The front panel 1a is shaped like a kangaroo pocket and has an operating unit (not shown) for adjusting the heat level of the grill compartment. The top plate 2 is installed on top of the main body 1 and consists of a glass plate (not shown) on which a cooking pot is placed and a frame (not shown) that holds the four sides of the glass plate.

The top plate 2 has a three-port pot holder 21 corresponding to the installation positions of the three heating coils 3, an operating section P0 for setting the heating level of a metal pot placed on the pot holder 21, and an exhaust opening H2. The exhaust opening H2 is the outlet for the air path that originates from the exhaust duct 59 of the grill chamber 5 (described below) and the intake opening H1, and is located at the rear (right and left sides) of the top plate 2.

<Configuration of grill chamber 5>
Next, the configuration of the grill chamber 5 of this embodiment will be described with reference to Figures 4 to 7. Figure 4 is a front cross-sectional view of the cooking device 100 taken along line A-A in Figure 1, and Figure 5 is a front cross-sectional view of the cooking device 100 taken along line B-B in Figure 1. Figure 6 is a side cross-sectional view of the cooking device 100 taken along line C-C in Figure 1, and Figure 7 is a side cross-sectional view of the cooking device 100 taken along line D-D in Figure 1.

As shown in the figures, the grill chamber 5 of this embodiment has a box-shaped heating chamber 50 with a front opening through which food 57 is loaded and unloaded. This heating chamber 50 is made by assembling multiple components, each formed into a predetermined shape by pressing aluminum alloy plates, with screws, etc.

In this heating chamber 50, food 57 is placed in a deep-plate-shaped cooking pan 58 placed on a wire rack 54 and cooked. The cooking pan 58 is a deep plate made of a material such as aluminum and shaped like a rectangle when viewed from above, with its surface coated with a fluorine coating agent or the like.

An upper heater 51 and a lower heater 52 are installed in the heating chamber 50, sandwiching the cooking pan 58. By controlling the on/off of both heaters, the top and bottom surfaces of the food 57 in the cooking pan 58 can be heated simultaneously or alternately. The upper heater 51 and lower heater 52 are heat sources that utilize radiant heat, such as sheath heaters or electric heaters.

In this grill chamber 5, a door 6 for closing the front opening of the heating chamber 50 slides back and forth along a pair of door rails 56 located on the left and right lower sides of the heating chamber 50. The door 6 is wider and taller than the front opening of the heating chamber 50, and the front side of the heating chamber 50 is equipped with a flange portion 50a (see Figure 7) that extends vertically. Therefore, by bringing the door 6 and the flange portion 50a into approximate surface contact, the front opening of the heating chamber 50 can be airtightly sealed.

In addition, by providing a rubber gasket (not shown) on the contact surface between the door 6 and the flange portion 50a, the airtightness of the front opening of the heating chamber 50 can be further improved. The stand 54 on which the cooking pan 58 is placed slides back and forth in conjunction with the sliding of the door 6 using the door rail 56. The door 6 is detachable from the stand 54, and if it becomes dirty, it can be removed from the grill chamber 5 and cleaned.

An exhaust duct 59 is provided above the rear side of the heating chamber 50 to exhaust oily smoke and steam from within the heating chamber 50, and is configured to be exhausted through an exhaust opening H2 located at the rear of the top plate 2 (see Figure 3). A catalyst 55 for smoke and odor removal is provided inside the exhaust duct 59, which communicates with the exhaust opening H2.

<Configuration around door 6>
Next, the detailed structure around the door 6 of this embodiment will be described with reference to FIG. 6, which is a side cross-sectional view of the grill chamber 5, FIG. 7, which is a side cross-sectional view of the cooking device 100 taken along line D-D shown in FIG. 1, and FIG. 8, which is a schematic diagram of the cooking device 100 as viewed from above.

<<Door configuration>>
As shown in FIG. 6, the door 6 that closes the opening of the heating chamber 50 is made up of a box body 61 having a space inside, and a handle unit 62 provided above the box body 61.

The outer casing of the box 61 is made up of a door panel 61a that forms the front of the door 6, a door base 61b that forms the top and bottom surfaces of the box 61, and a frame 61c that forms the back and left and right surfaces of the door 6. The frame 61c, which forms the back of the door 6, is also provided with a viewing window 61d that allows observation of the inside of the heating chamber 50 when the grill cabinet 5 is in use. In this embodiment, the viewing window 61d is supported by a partition member 61e, and the gap between the partition member 61e and the frame 61c forms a heat shield 61f.

The handle unit 62 is a heat-resistant resin member attached to the upper end of the door 6. The handle unit 62 of the present invention has a recess 62a formed behind the door panel 61a (toward the heating chamber 50) to form a handle portion. In this embodiment, the front end of the handle portion of the handle unit 62 is aligned with the front surface of the door panel 61a. The interior of the handle unit 62 is a cavity 62b, with openings 62c at both ends of the cavity 62b. Each of these is explained in detail below.

The door panel 61a is a flat member made of glass, for example, and is fixed to the frame 61c by being sandwiched between the upper and lower door bases 61b.

The door base 61b is a heat-resistant resin member that supports the door panel 61a. In this embodiment, the handle unit 62 is located above the door base 61b, which is located above the door panel 61a. However, the upper door base 61b and the handle unit 62 may share the same bottom surface, as long as the internal spaces of the box body 61 and the handle unit 62 are separated.

By using a resin material for the handle unit 62 and door base 61b, the handle portion of the handle unit 62 and the mounting structure of the door panel 61a can be molded into any shape, making it easier to improve the assembly and design of the door 6.

Frame 61c is formed by bending the top, bottom, left, and right edges of a thin metal plate, into a box shape with a predetermined thickness in the front-to-back direction, open at the front and closed at the rear and top, bottom, left, and right sides. A hole is molded into the surface of frame 61c that covers the opening of heating chamber 50, and a sight window 61d made of heat-resistant glass is provided to cover this hole. A partition member 61e is provided on the inside of frame 61c to support sight window 61d. The partition member 61e placed on the inside of frame 61c forms two-layer gaps: between door panel 61a and partition member 61e, and between partition member 61e and frame 61c. Each gap becomes a nearly airtight space, forming a heat-shielding section 61f with little air flow and suppressing heat transfer.

By using the door 6, which is composed of the handle unit 62, door panel 61a, door base 61b, frame 61c, and partition member 61e described above, the unevenness of the front surfaces of the handle unit 62 and door panel 61a can be minimized, allowing the door to be integrated into the design of the kitchen counter. Furthermore, by providing two spaces, one above and one below, the door 6 allows the selection of cooling means appropriate for each area.

<<Air flow route around door 6>>
Next, a configuration for blowing air into the cavity 62b in the handle unit 62 through an air blowing path around the entire periphery of the door 6 will be described.

As shown in Figures 1 and 6, in the cooking appliance 100 of this embodiment, when the door 6 of the grill chamber 5 is closed, the door panel 61a, front panel 1a, and the front position of the front end of the handle unit 62 are positioned in a positional relationship such that they are substantially flush with each other. The recess 62a of the handle unit 62 is embedded closer to the heating chamber 50 than the door panel 61a. Furthermore, the cavity 62b within the handle unit 62 is located between the recess 62a and the flange portion 50a of the heating chamber 50, and communicates with openings 62c provided at the left and right ends of the handle unit 62.

As shown in Figure 7, the front end of the ventilation duct 45, located behind the front panel 1a on the right side of the main body 1, has a suction opening 45a aligned with the opening 62c at the right end of the handle unit 62, allowing the air path of the ventilation duct 45 to communicate with the cavity 62b within the handle unit 62. The opening 62c at the right end of the handle unit 62 and the suction opening 45a are located close to each other, for example, within a distance of 2 mm or less when the door is closed, minimizing the amount of air leaking through the gap between them. This is because the ventilation resistance from the opening 62c at the left end of the handle unit 62, through the cavity 62b, to the opening 62c at the right end is sufficiently small compared to the pressure loss of air leaking through the gap.

In other words, as shown in the schematic diagram in Figure 8, the ventilation duct 45 is connected to the intake duct 95 that forms the space on the intake side of the main fan unit 9, and when the main fan unit 9 is driven, air is also drawn into the ventilation duct 45 via the intake duct 95. Therefore, the air flow around the door that cools the recess 62a of the handle unit 62 first enters the cavity 62b from the opening 62c at the left end of the handle unit 62, and the air that exchanges heat in the cavity 62b passes through the opening 62c at the right end of the handle unit 62, flows through the ventilation duct 45 via the suction opening 45a, and is drawn into the intake duct 95.

The thermal energy of the air that rises in temperature within cavity 62b as a result of cooling handle unit 62 is minimal and is not at a level that would affect the cooling efficiency of substrate 7 or heating coil 3 within main body 1. In this embodiment, opening 62c through which outside air flows into cavity 62b is provided only on the left side surface of handle unit 62, but openings 62c may also be provided on the front or top surface of handle unit 62 as long as they are connected to cavity 62b. The more openings 62c there are and the larger their opening areas, the less ventilation resistance there is to the air flowing within cavity 62b, making it easier for cooling air to flow.

In addition, while the recesses 62a shown in this embodiment have the same shape on the left and right sides of the handle unit 62, they may also be configured so that a handle portion is provided only in a portion of the handle unit 62, such as in the center portion of the handle unit 62. For example, if the recesses 62a are only in the center portion of the handle unit 62, the area of the left and right openings 62c can be made larger, making it easier for air to enter the cavity 62b.

In addition, in the embodiment, only the handle portion of the handle unit 62 is cooled, but by connecting the cavity 62b within the handle unit 62 with the space of the box body 61, some of the air can be used to cool the door panel 61a.

As described above, in this embodiment, low-temperature outside air flows into the recess 62a, which is the main grip portion of the handle unit 62 located above the door 6, allowing for efficient cooling.

<<Modifications>>
Next, a modified example of the first embodiment will be described with reference to Fig. 9. Fig. 9 is a diagram showing a modified example of the cooking device.

In the modified example shown in Figure 9, the base plate 7 of the cooking appliance 100 is positioned to the side of the grill chamber 5. The main fan unit 9, which blows air to the base plate 7, is positioned between the base plate 7 and the front panel 1a. The main fan unit 9 draws air from the front bottom surface of the main body 1, a part of the front panel 1a, or a gap around its periphery, and blows it toward the base plate 7. In other words, by connecting the space upstream (suction side) of the main fan unit 9 with the suction opening 45a, air can be drawn in through the opening 62c (right side) of the handle unit 62, as in Figure 8. The main fan unit 9 is close to the opening 62c of the handle unit 62, which has the effect of simplifying the structure.

<Grilling operation>
Next, cooling of the handle portion of the door 6 during actual grill cooking will be specifically described with reference to Figures 1 to 8. Here, the description will be given taking as an example the case where food (not shown) placed on the cooking pan 58 of the heating chamber 50 is cooked.

First, the user pulls the door 6 forward to open the front opening of the heating chamber 50, places the cooking pan 58 with food inside the heating chamber 50, and then sets the cooking temperature and time using the control panel (not shown) on the front panel 1a, or selects a preset automatic cooking menu, and presses the cook button on the control panel to begin grill cooking. Then, as cooking begins, the upper heater 51 or lower heater 52 is energized, heating the food. The main fan unit 9 also operates to prevent the temperature of the internal components of the main body 1 from rising when the grill chamber 5 is in use.

During heating, the wall temperature of the heating chamber 50 rises, and the resulting hot air also raises the temperatures of the flange portion 50a of the heating chamber and the frame 61c of the door 6. Around the door 6, the hot air rises by natural convection, heating the handle unit 62 located at the top of the door 6. Meanwhile, when the main fan unit 9 is driven, negative pressure is created within the intake duct 95 on the suction side of the impeller 91, creating a flow in which air is drawn in through the intake opening H1 and the ventilation duct 45 connected to the intake duct 95. The ventilation duct 45 is connected to the suction opening 45a at the rear of the front panel 1a and draws air from the cavity 62b of the handle unit 62 through an opening 62c located adjacent to the suction opening 45a. By drawing outside air into the cavity 62b in this way, the recess 62a of the handle unit 62 is cooled. In other words, while the grill chamber 5 is in use, the main fan unit 9 is running, allowing air to be steadily drawn into the cavity 62b of the handle unit 62 and cooled.

Note that while grilling, the user may be cooking another dish on the top plate 2, and in doing so may work in front of the main body 1 or move left and right in front of the kitchen counter. The door 6 of the grill chamber 5 of the present invention is designed to be nearly flat with minimal unevenness between the kitchen counter and the front of the main body, making it less likely to catch on clothing or interfere with cooking operations. It also reduces the risk of food or other debris flying from the top plate 2 adhering to and soiling the handle unit 62.

As explained above, the cooking appliance of this embodiment efficiently cools the handle unit 62, minimizes irregularities on the front side of the main body 1, and provides a system kitchen with excellent design and ease of cleaning.

Next, the cooking device of Example 2 will be described using Figures 10 and 11. Note that overlapping explanations of points common to Example 1 will be omitted.

Figure 10 is a perspective cross-sectional view of the cooking appliance 100 of this embodiment with the door open, and Figure 11 is a schematic diagram of the cooking appliance 100 of Figure 10 as viewed from above. The cooking appliance 100 of this embodiment differs from Example 1 in the air-blowing structure using the ventilation duct 45 that communicates with the handle unit 62. That is, in this embodiment, a dedicated door cooling fan 49 is provided on the side of the grill chamber 5 and near the front panel 1a, separate from the main fan unit 9, as air-blowing means for blowing air into the cavity 62b within the handle unit 62. This allows the handle unit 62 to be cooled regardless of the placement of the circuit board 7 and main fan unit 9 within the cooking appliance 100. In this embodiment, the circuit board 7 is located on the side of the grill chamber 5, and the main fan unit 9 is provided behind the circuit board 7. As with Example 1, the direction of air flow within cavity 62b is preferably such that the door cooling fan 49 draws air toward the main body 1, but if the cooling performance of the door cooling fan 49 is sufficient, it may also be configured to blow outside air from the door cooling fan 49 through the ventilation duct 45 into cavity 62b of the handle unit 62.

This makes it easy to determine the flow rate of air sent to the cavity 62b inside the handle unit 62 by selecting the door cooling fan 49 taking into account the fan characteristics. Furthermore, because the cooling fan's outer shape can be selected to match the cross-section of the ventilation duct's air passage, ventilation resistance caused by the ventilation duct 45 can be reduced, allowing for more efficient airflow. Furthermore, because the main fan unit 9 and door cooling fan 49 can be controlled separately, it is possible to suppress abnormal noise and other noise that occurs when the flow passing through the cavity 62b is excessive. Furthermore, it is also possible to reduce heat leakage (energy loss) from the heating chamber 50 due to excessive cooling of the handle unit 62, which occurs when the handle unit 62 is configured using the main fan unit 9 as in Example 1.

Next, a cooking device according to a third embodiment will be described using Figures 12 and 13. Note that overlapping explanations of points common to the above embodiments will be omitted.

Figure 12 is a perspective view of the cooking device of this embodiment when the door is open, and Figure 13 is a schematic side cross-sectional view of the grill chamber 5. The opening structure of the door 6 and the structure of the box body 61 of the door 6 differ from those of Example 1.

In other words, in this embodiment, the cooling configuration of the present invention is applied to a structure in which the door 6 opens vertically. Because this is the ventilation path when the door 6 is closed, the present invention is applicable regardless of how the door 6 is opened. Furthermore, in this embodiment, a unique cooling structure is also provided for the box 61. That is, the handle unit 62, like in the first and second embodiments, is configured to circulate cooling air into the cavity 62b through the opening 62c of the handle unit 62 by cooling means (main fan unit 9 and door cooling fan 49) provided behind the front panel 1a. Furthermore, the box 61 is provided with an exhaust port 61g on the frame 61c, which forms its side, and an intake port 61h on the lower door base 61b, which forms its bottom. This configuration utilizes the rising air currents generated inside the box 61 to circulate cooling air and reduce the temperature of the door panel 61a.

This reduces the temperature of the handle unit 62 and the door panel 61a, allowing the entire door to be cooled efficiently.

Next, we will explain the cooking device of Example 4 using Figure 14. Note that we will omit redundant explanations of points common to the above examples.

Figure 14 is a schematic diagram of a side cross-sectional view of the grill chamber 5 of this embodiment, which differs from embodiment 1 in that the door cooling fan 49, which blows air into the cavity 62b in the handle unit 62, is located inside the box body 61 of the door 6. That is, in this embodiment, the cavity 62b of the handle unit 62 is connected to the space of the box body 61, and part of the box body 61 serves as a ventilation duct 45b, allowing air to be blown into the cavity 62b from the door cooling fan 49 installed in the box body 61.

This allows the entire door 6 to be cooled efficiently and simultaneously, regardless of the placement of the circuit board 7 or main fan unit 9 inside the main body. In Figure 14, the air intake 61h for the door cooling fan 49 is provided in the lower door base 61b, with the cavity 62b of the handle unit 62 at the most downstream side. To more efficiently cool the grip of the handle unit 62, the cooling fan may be positioned so that it draws in outside air through the opening 62c of the handle unit 62 and exhausts it out through an opening located in the same position as the air intake 61h in Figure 14.

The present invention is not limited to the above-described embodiments, and includes various modifications. The above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those that include all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace other configurations with respect to the configuration of each embodiment.

100... cooking appliance, 1... main body, 1a... front panel, 2... top plate, 3... heating coil,
4...board cover, 5...grill chamber, 50...heating chamber, 50a...flange portion, 51...upper heater, 52...lower heater, 54...base, 55...catalyst, 56...door rail, 58...cooking pan, 59...exhaust duct, 6...door, 61...box body, 61a...door panel, 61b...door base, 61c...frame, 61d...sight window, 61e...partition member, 61f...heat shield portion, 61g...exhaust port, 61h...intake port, 62...handle unit, 62a...recess, 62b...cavity, 62c...opening, 7...board, 9...main fan unit, 91...impeller, 95...intake duct, 45, 45b...ventilation duct, 45a...suction opening,

Claims (8)

A cooking appliance comprising: a pot holder disposed on the top surface of a main body; a grill chamber disposed below the pot holder and in front of the main body; a control board; and a main fan device for cooling the control board.
The grill chamber has a heating chamber having an opening on the front surface, a heating means for heating the inside of the heating chamber, and a door for covering the opening,
The door has a box body that covers the opening and a handle unit that is disposed above the box body,
the handle unit has a grip portion formed by recessing a part of a front surface toward the heating chamber, and a cavity disposed closer to the heating chamber than the grip portion and having a plurality of openings in a wall surface;
A cooking device characterized in that a ventilation duct communicating with one of the plurality of openings is provided on a side of the grill chamber. The cooking device according to claim 1,
A cooking device characterized in that the front end of the handle portion is positioned in a positional relationship that is approximately flush with the front surface of the box body. The cooking device according to claim 1,
A cooking device characterized in that one of the plurality of openings is provided on the front or top surface of the handle unit. The cooking device according to claim 1,
the opening communicating with the ventilation duct is an opening provided on a side surface of the handle unit,
The cooking appliance is characterized in that the ventilation duct draws air from the cavity using the main fan device arranged on the rear side of the main body. The cooking device according to claim 1,
the opening communicating with the ventilation duct is an opening provided on a side surface of the handle unit,
The cooking appliance is characterized in that the ventilation duct draws air from the cavity by the main fan device disposed on the front side of the main body. The cooking device according to claim 1,
the opening communicating with the ventilation duct is an opening provided on a side surface of the handle unit,
The cooking appliance is characterized in that the ventilation duct draws air from the cavity using a door cooling fan disposed on the front side of the main body. The cooking device according to any one of claims 1 to 6,
The cooking device is characterized in that the box body has a cavity inside and a plurality of openings on its outer casing. A cooking appliance comprising: a pot holder disposed on the top surface of a main body; a grill chamber disposed below the pot holder and in front of the main body; a control board; and a main fan device for cooling the control board.
The grill chamber has a heating chamber having an opening on the front surface, a heating means for heating the inside of the heating chamber, and a door for covering the opening,
The door has a box body that covers the opening and a handle unit that is disposed above the box body,
the handle unit has a grip portion formed by recessing a part of a front surface toward the heating chamber, and a cavity disposed closer to the heating chamber than the grip portion and having a plurality of openings in a wall surface;
A cooking device characterized in that a ventilation duct communicating with an opening on the box side among the plurality of openings, and a door cooling fan supplying outside air to the ventilation duct are arranged inside the box.