JP5542725B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker that heats an object to be heated disposed on an upper surface of a top plate by a heating means provided in a main body.

  Conventionally, as this type of cooking device, “a plurality of air discharge ports 35D are formed as air discharge portions on the upper surface of the air duct portion 35B at positions corresponding to the lower surfaces of the induction heating coils 4 and 5; The peripheral members such as the induction heating coils 4 and 5 and the coil bases 4A and 5A that support the induction heating coils 4 and 5 are cooled by the air discharged from the air discharge port 35D (for example, see Patent Document 1).

JP 2010-182480 A (page 11, FIG. 5)

The heating cooker described in Patent Document 1 has a configuration in which cooling air is blown out to two heating coils from an air duct portion (cooling duct) provided so as to straddle two heating coils.
However, a technique for efficiently supplying more cooling air to one of the two heating coils has not been disclosed. For example, when one of the two heating coils has a larger heat generation amount than the other, it is necessary to increase the cooling air relative to the heating coil having the larger heat generation amount. The case could not be handled. In order to increase the cooling capacity, it is conceivable to increase the blowing capacity of the fan. However, in that case, the cooling capacity becomes excessive in part, and the operation cost and noise increase.

  This invention is made | formed in order to solve the above subjects, and provides the heating cooker provided with the cooling duct which can cool a heating coil efficiently.

  The cooking device according to the present invention includes a main body, a top plate that covers an upper surface of the main body, a first heating coil and a second heating coil disposed in the main body, and an air supply for supplying cooling air into the main body. Means, a first cooling duct disposed below the first heating coil, and formed with a plurality of jet openings for ejecting the cooling air supplied by the blowing means toward the first heating coil, and the second A second cooling duct disposed below the heating coil, and formed with a plurality of jet ports for ejecting the cooling air supplied by the blowing means toward the second heating coil; the first cooling duct; and the second cooling duct. A connecting portion that communicates with the cooling duct, and the second cooling duct is configured to be relatively large with respect to the first cooling duct, and the cooling air supplied by the blowing means is One cooling duck And in which by way of the connecting portion is arranged to be guided to the second cooling duct.

  According to the present invention, the second cooling duct is configured to be relatively large with respect to the first cooling duct, and the cooling air supplied by the blowing means passes through the first cooling duct and the connecting portion. Arranged to be led to the second cooling duct. For this reason, even when a 2nd heating coil is comprised large sized with respect to a 1st heating coil, a 2nd heating coil can be cooled. Moreover, since the 2nd cooling duct has been arrange | positioned with respect to the 1st cooling duct in the downstream of cooling air, the cooling air from a ventilation means can be used efficiently.

It is a perspective view which decomposes | disassembles and shows a part of heating cooker which concerns on embodiment. It is a top view in the state where the top plate of the cooking-by-heating machine concerning an embodiment was removed. It is a top view of the state which removed the top plate and heating means of the heating cooker which concerns on embodiment. It is a perspective view of the air path unit which concerns on embodiment. It is a figure explaining the right cooling duct which concerns on embodiment. It is a figure explaining the left cooling duct which concerns on embodiment. It is XX arrow sectional drawing of FIG. It is the perspective view which looked at the cooling duct which concerns on embodiment from the bottom. It is a figure explaining the flow of the cooling air of the heating cooker which concerns on embodiment.

  FIG. 1 is an exploded perspective view showing a part of the heating cooker according to the embodiment. Drawing 2 is a top view in the state where the top plate of the cooking-by-heating machine concerning an embodiment was removed. In the following description, when describing the direction of the heating cooker, the lower side of the paper in FIG. 2 is referred to as “front side”, the upper side of the paper is referred to as “rear side”, and the top plate side in the heating cooker is referred to as “upper side”. Called.

[Overall configuration of cooking device]
The cooking device 100 is a so-called built-in cooking device that is installed in an installation opening formed in kitchen furniture such as a sink. The heating cooker 100 includes a substantially rectangular parallelepiped main body case 1 having an upper surface opened and a top plate 2 covering the upper surface opening of the main body case 1. A main body intake port 11 and a main body exhaust port 12 are provided on the rear side of the main body case 1. The inside of the main body case 1 is partitioned vertically by a support plate 13. A box-shaped grill heating chamber 14 is provided below the support plate 13, and the left heating coil unit 3 and right heating are provided above the support plate 13. A coil unit 4 and an electric heater 5 are provided. An operation display unit 15 is provided on the front side of the top plate 2. Inside the main body case 1, a circuit board 16 on which a circuit for performing overall control including heating control of the cooking device 100 is mounted, and an operation display board 17 are provided.

  The entire top plate 2 is made of a material such as heat-resistant tempered glass or crystallized glass, and is formed in a rectangular or square shape according to the shape of the opening of the main body case 1. The top plate 2 is surrounded by an upper frame 2a formed in a frame shape from a metal plate such as a nonmagnetic stainless steel plate or an aluminum plate. Between the outer periphery of the top plate 2 and the opening of the upper frame 2a, rubber packing or a sealing material (not shown) is interposed, and both are fixed in a watertight state. As described above, the gap formed in the facing portion between the upper frame 2a and the top plate 2 is closed by the rubber packing or the sealing material (not shown). Water droplets do not enter inside.

  The upper frame 2a includes a top plate intake port 21 and a top plate exhaust port 22 that are simultaneously punched and formed by a press machine when the upper frame 2a is formed. The top plate intake port 21 is provided at a position corresponding to the main body intake port 11, and the top plate exhaust port 22 is provided at a position corresponding to the main body exhaust port 12. Although not shown, a cover having a large number of small communication holes is detachably mounted on the top plate intake port 21 and the top plate exhaust port 22. Intrusion of foreign matter into the top plate exhaust port 22 is suppressed.

  A main body inlet 11 provided on the upper surface on the rear side of the cooking device 100 is an opening for sucking air into the cooking device 100. Moreover, the main body exhaust port 12 provided in the upper surface of the rear side of the heating cooker 100 is an opening part for discharging | emitting the heated air in the heating cooker 100 to the exterior of the heating cooker 100. FIG. The intake and exhaust of the cooking device 100 will be described later.

  The grill heating chamber 14 has a substantially box shape in which left, right, top, bottom, and rear wall surfaces are formed of a metal plate such as stainless steel or a steel plate. Heating means such as an electric heater (not shown) is provided near the ceiling or bottom surface in the grill heating chamber 14, and the inside of the grill heating chamber 14 is heated by this heating means. The front side of the grill heating chamber 14 is covered with a door (not shown) so as to be opened and closed.

The left heating coil unit 3 and the right heating coil unit 4 are electromagnetic induction heating means for heating an object to be heated such as a pan placed on the top plate 2 by electromagnetic induction.
The right heating coil unit 4 includes a heating coil 42 (first heating coil) configured by winding an assembly wire obtained by twisting a plurality of thin copper wires into a spiral shape so that the outer diameter shape is circular. Yes. The heating coil 42 is placed above the support plate 13 of the main body case 1 while being placed on the coil base 41.

  In the present embodiment, the left heating coil unit 3 is shown as including an annular central heating coil 32 and four outer peripheral heating coils 33 provided on the outer peripheral side of the central heating coil 32. The central heating coil 32 and the outer peripheral heating coil 33 (second heating coil) are placed above the support plate 13 of the main body case 1 while being placed on the coil base 31. The central heating coil 32 and each outer peripheral heating coil 33 are configured such that the heating output can be set independently.

  In the present embodiment, the sizes of the left heating coil unit 3 and the right heating coil unit 4 are asymmetric, and the left heating coil unit 3 has an outer diameter larger than that of the right heating coil unit 4. It occupies almost half of the left side of case 1. And the heating output by the left heating coil unit 3 is larger than the heating output by the right heating coil unit 4. The left heating coil unit 3 and the right heating coil unit 4 are arranged side by side with respect to the main body case 1, but the left heating coil unit 3 and the right heating coil unit 4 are arranged on the left and right center lines of the main body case 1. It is arranged at an asymmetrical position. The rear end portion of the left heating coil unit 3 is disposed in a positional relationship such that the rear end portion of the left heating coil unit 4 is located on the far side of the main body case 1 with respect to the rear end portion of the right heating coil unit 4.

  In the present embodiment, the left heating coil unit 3 and the grill heating chamber 14 are disposed on the same side with respect to the left-right direction of the main body case 1. That is, the left heating coil unit 3 having a relatively larger diameter than the right heating coil unit 4 is disposed on the grill heating chamber 14. Since the upper wall of the grill heating chamber 14 has a flat plate shape, the left heating coil unit 3 having a relatively large diameter can be stably installed.

  In the coil base 31 and the coil base 41, a plate-shaped or rod-shaped ferrite member (magnetic shield ferrite) (not shown) is provided as a magnetic flux leakage preventing member from the mounted heating coil.

  The electric heater 5 is a heating unit that heats an object to be heated such as a pan placed on the top plate 2 by radiation. As the electric heater 5, for example, a nichrome wire, a halogen heater, a radiant heater or the like is used. The electric heater 5 is arranged in a gap on the back side of the left heating coil unit 3 and the right heating coil unit 4 arranged on the left and right. Since the left heating coil unit 3 is larger than the right heating coil unit 4, the electric heater 5 is disposed on the far right side of the main body case 1 in the present embodiment. In addition, it can also be set as the structure which does not provide the electric heater 5. FIG.

The operation display unit 15 includes an operation unit that receives an operation from the user and outputs a signal corresponding to the operation, and a display unit that displays a heating condition, an operation state, and the like. As an operation means, arbitrary things, such as an operation button which receives pressing operation from a user, and a touch panel which receives touch operation from a user, can be used. As the display means, an arbitrary device such as a liquid crystal screen or a lamp can be used.
Instead of the operation display unit 15 provided on the top plate 2 or in addition to the operation display unit 15, an operation unit such as a button or a dial or a display unit such as a lamp may be provided on the front side of the main body case 1. Good.

  The operation display board 17 is disposed on the front side of the main body case 1 and is connected to the operation display unit 15 and the circuit board 16 by signal lines (not shown). The operation display board 17 includes a circuit that receives a signal from the operation display unit 15 and sends the signal to the circuit board 16, and a circuit that controls a display operation by the operation display unit 15 based on a control signal from the circuit board 16. Has been implemented. In this embodiment, an example in which a control circuit related to operation and display is mounted on one substrate (operation display substrate 17) is shown, but these may be mounted on separate substrates.

  A board case 7 (see FIGS. 3 and 4) is provided in the main body case 1 at a position on the right side, and a circuit board 16 is accommodated in the board case 7. The circuit board 16 includes an inverter circuit that drives the left heating coil unit 3 and the right heating coil unit 4, a drive circuit for the heaters of the electric heater 5 and the grill heating chamber 14, and a fan drive circuit that drives the fan 62 of the fan unit 6. And a circuit board on which a control circuit that performs overall control of the cooking device 100 is mounted. Each circuit may be mounted separately on a plurality of boards, or may be mounted together on one board. In this embodiment, the board on which each circuit is mounted is referred to as a circuit board 16. It shall be named generically. The control circuit mounted on the circuit board 16 includes one or a plurality of microcomputers, performs heating control of the left heating coil unit 3 and the right heating coil unit 4 through an inverter circuit, and also includes an electric heater 5 and a grill heating chamber. Heating control is performed via 14 drive circuits. Further, the control circuit receives a signal from the operation display unit 15 via the operation display board 17 and performs the above-described heating control based on this signal, and in the operation display unit 15 via the operation display board 17. Perform display control.

[Intake / exhaust structure]
Next, the intake structure and exhaust structure of the heating cooker 100 will be described.
Drawing 3 is a top view in the state where the top plate and heating means of the cooking-by-heating machine concerning an embodiment were removed. FIG. 4 is a perspective view of the air passage unit according to the embodiment. FIG. 5 is a diagram illustrating the right cooling duct according to the embodiment, and is a perspective view seen from below. 6A and 6B are diagrams for explaining the left cooling duct according to the embodiment, in which FIG. 6A is a bottom view and FIG. 6B is a perspective view seen from below. 7 is a cross-sectional view taken along the line XX of FIG. FIG. 8 is a perspective view of the cooling duct according to the embodiment as viewed from below.

  The air path unit 200 is an assembly of parts for supplying air sucked from the outside of the main body case 1 as cooling air to various components in the main body case 1, and roughly includes a fan unit 6 and a board case. 7 and a cooling duct 300.

The fan unit 6 includes a fan case 61 and a fan 62 as a blowing means accommodated in the fan case 61. The fan 62 is, for example, a sirocco fan, and its operation is controlled by a fan driving circuit mounted on the circuit board 16.
The fan unit 6 is installed inside the main body case 1 and below the main body intake port 11. When the fan 62 of the fan unit 6 operates, air outside the main body case 1 is sucked from the main body intake port 11.

  The board case 7 is a board housing part for housing the circuit board 16 and includes a left board case 71 and a right board case 72. The left substrate case 71 and the right substrate case 72 have a box shape having an opening surface on one surface. The substrates that receive the circuit substrate 16 are brought into contact with each other by an engagement means (not shown). The outline of the case 7 is configured.

  The board case 7 accommodates the circuit board 16 and also serves as an air path for cooling air from the fan unit 6. The substrate case 7 includes a cooling air inlet (not shown) for allowing the cooling air from the fan case 61 to flow into the substrate case 7 in a part of the surface adjacent to the fan case 61. Further, a cooling air discharge port 73 for discharging cooling air to the outside of the substrate case 7 is opened at a position on the front side of the upper surface of the substrate case 7. The cooling air flowing into the inside of the substrate case 7 from the cooling air inlet (not shown) cools each component mounted on the circuit board 16 while passing through the vicinity of the circuit board 16 in the substrate case 7. Then, it proceeds toward the front side of the main body case 1 and flows out from the cooling air discharge port 73 to the outside of the substrate case 7.

  The cooling duct 300 includes a left cooling duct 8 (second cooling duct), a right cooling duct 9 (first cooling duct), and a connecting air passage 10 (connecting portion). The left cooling duct 8 and the right cooling duct 9 are ducts that discharge cooling air toward the left heating coil unit 3 and the right heating coil unit 4, respectively. The connection air passage 10 is a ventilation passage that allows the right cooling duct 9 and the left cooling duct 8 to communicate with each other. The left cooling duct 8, the right cooling duct 9, and the connecting air passage 10 are molded of plastic. In the present embodiment, the left cooling duct 8 and the connection air passage 10 are integrally formed. By connecting the left cooling duct 8 and the connection air passage 10 thus formed integrally with the right cooling duct 9, A cooling duct 300 having a series of ventilation spaces is configured. The cooling duct 300 is disposed at a position where at least a part (a part of the right cooling duct 9 in the present embodiment) overlaps with the cooling air discharge port 73 of the substrate case 7 when viewed from above.

The right cooling duct 9 is installed between the upper surface of the support plate 13 and the lower surface (back surface) of the right heating coil unit 4 and has a function of blowing cooling air toward the right heating coil unit 4. The right cooling duct 9 is disposed so as to face the cooling air outlet 73 of the substrate case 7 and is assembled to the substrate case 7 with screws or the like.
The right cooling duct 9 includes an upper wall 91. In the present embodiment, of the outer shape of the upper wall 91, the left side portion that is a part to be assembled on the substrate case 7 is formed in a rectangular shape, and the right side portion disposed below the right heating coil unit 4 is It is formed in a substantially semicircular shape according to the outer shape of the right heating coil unit 4. As shown in FIG. 8, the connection air passage 10 is connected to the semicircular portion of the upper wall 91 of the right cooling duct 9, and a ventilation space communicating with the right cooling duct 9 and the connection air passage 10 is formed. The upper wall 91 of the right cooling duct 9 is provided with a plurality of jet openings 93 formed so as to penetrate the upper wall 91. The jet port 93 is an opening formed for ejecting the cooling air toward the right heating coil unit 4.

The left cooling duct 8 is installed between the upper surface of the support plate 13 and the lower surface (back surface) of the left heating coil unit 3, and has a function of blowing cooling air toward the left heating coil unit 3.
The left cooling duct 8 includes an upper wall 81 and an outer peripheral wall 82 formed downward from the upper wall 81. The outer shape of the upper wall 81 is formed in a substantially circular shape in accordance with the outer shape of the left heating coil unit 3. The upper wall 81 is provided with a plurality of jet openings 83 formed so as to penetrate the upper wall 81. As shown in FIG. 6, the outer peripheral wall 82 is provided in an arc shape in an area of the outer periphery of the upper wall 81 excluding a boundary portion with the connection air passage 10 (left side in FIG. 6). On the lower surface of the upper wall 81, an inner peripheral rib 84 that is an arcuate wall portion extending downward is formed. A shunt passage for cooling air is formed between the radially inner side and the outer side of the inner peripheral rib 84.

  The cooling duct 300 is formed with a flange-like coupling portion 85. By assembling the coupling portion 85 to the support plate 13 with screws or the like, a ventilation path is formed inside the support plate 13 and the cooling duct 300. The As shown in FIG. 7, the lower end of the outer peripheral wall 82 and the lower end of the inner peripheral rib 84 of the left cooling duct 8 are in contact with the upper surface of the support plate 13, and cooling air is generated between the upper surface of the support plate 13 and the upper wall 81. A space for passing through is formed. Further, the inner peripheral rib 84 is located at a boundary portion between the central heating coil 32 and the outer peripheral heating coil 33 shown in FIG. That is, as shown in FIGS. 2, 3, and 7, the inner peripheral rib 84 is provided at a position that surrounds the outer side of the central heating coil 32 in an arc shape.

In the following description, the jet port 83 positioned on the radially inner side of the inner peripheral rib 84 may be referred to as the jet port 83a, and the jet port 83 positioned on the outer side may be referred to as the jet port 83b.
The diameters of the jet port 83 of the left cooling duct 8 and the jet port 93 of the right cooling duct 9 are not particularly limited. For example, the diameter is about 6 mm to 12 mm, and can be set according to the desired amount of cooling air. . Moreover, you may provide the jet nozzle which has a 2 or more types of aperture diameter like the jet nozzle 83 illustrated to FIG. 3, FIG.

  The connecting air passage 10 has an upper wall 10a, a side wall 10b extending downward from the upper wall 10a, and a side wall 10c, and forms a ventilation passage through which cooling air can pass. The connecting air passage 10 is integrally formed with the left cooling duct 8 and is connected to the right cooling duct 9. As shown in FIG. 8, the upper wall 10 a on the side where the right cooling duct 9 is connected in the connection air passage 10 is formed to match the semicircular shape of the upper wall 91 of the right cooling duct 9. By fitting the semicircular portion of the upper wall 91 of the right cooling duct 9 and the semicircular portion of the upper wall 10 a of the connection air passage 10 to match, the side wall 10 c is continued to the lower side of the upper wall 91. That is, the side wall 10 c of the connection air passage 10 functions as a part of the side wall of the right cooling duct 9.

  In the present embodiment, an example in which the connection air passage 10 and the left cooling duct 8 are integrally formed is shown. However, the connection air passage 10 and the left cooling duct 8 are configured separately and are connected to each other. It may be. Further, the connecting air passage 10 and the right cooling duct 9 may be integrally formed. Further, the length of the air path of the connection air path 10 is not limited to that shown in the figure, and any air path capable of circulating the cooling air from the right cooling duct 9 to the left cooling duct 8 may be used.

[Operation of cooking device]
Next, the operation of the cooking device 100 will be described.
When an object to be heated such as a pan is placed on the top plate 2 and the operation display unit 15 is operated by the user to give a heating instruction, the control circuit mounted on the circuit board 16 is moved from the operation display unit 15. The energization to the heating means (left heating coil unit 3, right heating coil unit 4, electric heater 5) designated based on the information is started. Thereby, an object to be heated such as a pan on the top plate 2 is heated.

  In parallel with the heating by the heating means, the control circuit mounted on the circuit board 16 drives the fan 62. When the fan 62 operates, cooling air for cooling the components in the heating cooker 100 is generated.

[Cooling air flow]
Next, the flow of cooling air in the heating cooker 100 will be described. FIG. 9 is a diagram illustrating the flow of cooling air in the heating cooker 100 according to the embodiment. In FIG. 9, the rough flow of the cooling air is schematically shown by arrows. Further, in FIG. 9, for convenience of explanation, the top plate 2, the left heating coil unit 3, the right heating coil unit 4, and the electric heater 5 are not illustrated, but these members are installed in a use state. Shall.

  When the fan 62 operates, air is sucked into the fan case 61 in the main body case 1 through the top plate air inlet 21 and the main body air inlet 11 (arrow X1 in FIG. 9). The sucked air is sent to the fan 62 and flows into the substrate case 7 as cooling air from the cooling air inlet (not shown) of the substrate case 7, and heat is generated from the circuit board 16 and the inverter in the substrate case 7. The part is cooled (arrow X2 in FIG. 9). The cooling air that has passed through the substrate case 7 exits from the cooling air outlet 73 of the substrate case 7 and flows into the right cooling duct 9 (arrow X3 in FIG. 9).

  A part of the cooling air flowing into the right cooling duct 9 is ejected upward from the jet port 93 to cool the right heating coil unit 4 in contact with the right heating coil unit 4 (arrow X4 in FIG. 9). . The cooling air blown from the jet port 93 flows through the upper part of the support plate 13 toward the rear of the main body case 1 and cools the electric heater 5 and other components in this process (arrow X5 in FIG. 9). The cooling air merges with the cooling air discharged from the main body exhaust port 12 and is discharged from the top plate exhaust port 22 (arrow X12 in FIG. 9).

  Further, a part of the cooling air flowing into the right cooling duct 9 proceeds to the left cooling duct 8 through the connection air passage 10 of the left cooling duct 8 (arrow X6 in FIG. 9). A part of the cooling air flowing into the left cooling duct 8 advances straight as it is and flows into the inner peripheral rib 84 (arrow X7 in FIGS. 7 and 9). The cooling air that has flowed into the inner peripheral rib 84 is ejected upward from a jet port 83 a provided inside the inner peripheral rib 84, and is an area centered on the central heating coil 32 of the left heating coil unit 3. This is cooled in contact with (arrow X8 in FIGS. 7 and 9).

  A part of the cooling air flowing into the left cooling duct 8 flows outside the inner peripheral rib 84 (between the inner peripheral rib 84 and the outer peripheral wall 82) (arrow X9 in FIG. 9). This air is jetted upward from a jet port 83b provided on the outer side of the inner peripheral rib 84, and cools this while coming into contact with the region around the outer peripheral heating coil 33 of the left heating coil unit 3 ( Arrow X10 in FIG. 9). The cooling air jetted from the jet openings 83a and 83b flows in the upper part of the support plate 13 toward the rear of the main body case 1 (arrow X11 in FIG. 9), and the cooling air discharged from the main body exhaust opening 12 or the jet outlet The cooling air from 93 is merged and discharged from the top plate exhaust port 22 (arrow X12 in FIG. 9).

  Here, the dimensional relationship of the cooling duct 300 and the flow of the cooling air will be further described. As shown in FIG. 3, the diameter of the left cooling duct 8 is ΦA, the diameter of the right cooling duct 9 is ΦB, the width of the connecting air passage 10 in the depth direction is width C, and the diameter of the inner peripheral rib 84 of the left cooling duct 8 is Let ΦD. Although the right cooling duct 9, the left cooling duct 8, and the inner peripheral rib 84 are not strictly circular or arcuate, the portions illustrated in FIG. 3 are referred to as ΦA, ΦB, width C, and ΦD, respectively. .

  First, ΦA (diameter of the left cooling duct 8)> ΦB (diameter of the right cooling duct 9). Since the left heating coil unit 3 has a larger diameter than the right heating coil unit 4, the left cooling duct 8 is made larger than the right cooling duct 9 in accordance with this. Thus, the cooling air is blown out to the whole area | region of each heating coil unit by making the left cooling duct 8 and the right cooling duct 9 into the magnitude | size match | combined with the corresponding left heating coil unit 3 and the right heating coil unit 4. To be able to.

  The relatively large-diameter left cooling duct 8 is arranged so as to be positioned downstream of the relatively small-diameter right cooling duct 9 in the flow of cooling air. By doing in this way, the loss of the cooling air blown from the fan unit 6 can be reduced, and cooling air can be used efficiently. For example, in contrast to the present embodiment, when the small-diameter cooling duct is arranged downstream of the large-diameter cooling duct, the cooling air passage narrows from the large-diameter cooling duct to the small-diameter cooling duct, so that the pressure is reduced. Loss (shape loss) increases. However, according to the present embodiment, the relatively large-diameter left cooling duct 8 is disposed downstream of the relatively small-diameter right cooling duct 9 in the cooling air flow. Pressure loss can be reduced as compared with the case where the arrangement of both cooling ducts is changed.

  Further, it is preferable that the flow passage cross-sectional area of the cooling air flowing to the connection air passage 10 in the right cooling duct 9 and the flow passage cross-sectional area of the connection air passage 10 are substantially the same. In the present embodiment, since the height of the upper surface of the cooling duct 300 and the support plate 13 is substantially constant throughout, ΦB (the diameter of the right cooling duct 9) and the width C are made as large as possible. By doing in this way, the pressure loss of the cooling wind which flows from the right cooling duct 9 to the connection wind path 10 can be suppressed.

  Further, ΦD (the diameter of the inner peripheral rib 84) is configured to have a size corresponding to the outer shape of the central heating coil 32 of the left heating coil unit 3. By doing so, the cooling air flowing into the left cooling duct 8 can be distributed to the central heating coil 32 and the outer peripheral heating coil 33. For example, unlike the present embodiment, when the inner peripheral rib 84 is not provided, the cooling air flowing into the left cooling duct 8 proceeds substantially linearly and is guided by the outer peripheral wall 82 on the right side of the paper in FIG. Most of the water is ejected from the jet port 83 in the vicinity. That is, most of the cooling air is blown only to a part of the outer peripheral heating coil 33, and there is a possibility that the entire left heating coil unit 3 cannot be efficiently cooled. In particular, in the left cooling duct 8 located on the downstream side of the right cooling duct 9 as in the present embodiment, the cooling air velocity is weaker than that of the right cooling duct 9, so the amount of cooling air blown out from the jet outlet 83. The variation of can be large. However, according to the present embodiment, since the inner peripheral rib 84 is provided, the cooling air flowing into the inner peripheral rib 84 is guided by the inner peripheral rib 84 and ejected from the jet port 83a. The cooling air flowing into the outside of the rib 84 is guided by the outer peripheral wall 82 and is ejected from the jet port 83b. In this way, the cooling air in the left cooling duct 8 can be distributed to the central heating coil 32 and the outer peripheral heating coil 33, and both can be efficiently cooled.

  The diameter and number of the jet openings 93 of the right cooling duct 9 are set to a minimum configuration sufficient to cool the right heating coil unit 4. The diameter and number of the jet ports 93 of the right cooling duct 9 are increased so that the cooling air jetted from the jet port 83 of the left cooling duct 8 is larger than the cooling wind jetted from the jet port 93 of the right cooling duct 9. Set. By doing in this way, more cooling air can be supplied to the left heating coil unit 3 with respect to the total cooling air volume of the fan unit 6.

  As described above, according to the present embodiment, the left cooling duct 8 is configured to be relatively large with respect to the right cooling duct 9, and the cooling air supplied by the fan unit 6 is converted into the right cooling duct. 9 and the connecting air passage 10 so as to be led to the left cooling duct 8. For this reason, even when the left heating coil unit 3 is configured larger than the right heating coil unit 4, the left heating coil unit 3 can be cooled. Further, since the left cooling duct 8 is arranged on the downstream side of the cooling air with respect to the right cooling duct 9, the pressure loss can be reduced as compared with the case where the arrangement of both cooling ducts is changed. Therefore, the cooling air from the fan unit 6 can be efficiently used to cool the left heating coil unit 3 and its peripheral components.

Further, since the left cooling duct 8 and the right cooling duct 9 communicate with each other to form a series of cooling ducts 300, the distribution of the cooling air blown out from each cooling duct is divided into the total area of the jet port 83 and the jet port 93 ( (Caliber and number) can be adjusted. That is, by increasing or decreasing the total area of the jet port 93 of the right cooling duct 9, the amount of cooling air to the left cooling duct 8 can be adjusted, and the cooling air can be easily distributed. Further, for example, when manufacturing multiple models having different heating values (necessary cooling air volume) between the left heating coil unit 3 and the right heating coil unit 4, the diameters of the jet port 83 and the jet port 93 according to the required cooling air volume. It is only necessary to design the number and the number, and the air volume adjustment is easy even when manufacturing many models.
As described above, by adjusting the jet port 83, the cooling air supplied from the fan 62 can be supplied to the left heating coil unit 3 more efficiently. Therefore, the cooling capacity for the left heating coil unit 3 can be increased without increasing the capacity of the fan 62, which contributes to cost reduction and energy consumption reduction.

  Further, the diameter and number of the jet ports 93 of the right cooling duct 9 are increased so that the cooling air jetted from the jet port 83 of the left cooling duct 8 is larger than the cooling wind jetted from the jet port 93 of the right cooling duct 9. It was set. For this reason, it is possible to supply more cooling air to the left heating coil unit 3 having a larger calorific value than the total cooling air amount of the fan unit 6.

  In addition, the cross-sectional area of the portion of the right cooling duct 9 where the cooling air flows toward the connection air passage 10 and the cross-sectional area of the connection air passage 10 are substantially the same. For this reason, the pressure loss of the cooling air flowing from the right cooling duct 9 to the connection air passage 10 can be suppressed. Therefore, the cooling air from the fan unit 6 can be efficiently used to cool the left heating coil unit 3 and its peripheral components.

  Further, the left heating coil unit 3 of the present embodiment includes a central heating coil 32 having a circular shape in plan view, and an outer peripheral heating coil 33 disposed on the outer periphery of the central heating coil 32. The left cooling duct 8 is provided with an inner peripheral rib 84 formed in a plan view arc shape having substantially the same diameter as that of the central heating coil 32, and the inner peripheral rib 84 provides cooling air in the left cooling duct 8. A shunt passage for shunting was formed. By diverting the cooling air in this way, it is possible to suppress the biasing of the cooling air to a part of the left heating coil unit 3, and the central heating coil 32 and the outer peripheral heating coil 33 can be cooled in a well-balanced manner.

  In the embodiment, the annular central heating coil 32 and the four outer peripheral heating coils 33 provided around it are shown as an example, but the specific configuration of the left heating coil unit 3 is not limited to this. For example, an annular heating coil that can be independently driven may be arranged in a double or triple manner. And it is good to provide a shunting path which distributes cooling air by providing an inner peripheral rib so that required cooling air may be allocated to each part of a heating coil.

  Further, in the present embodiment, the example in which the inner peripheral rib 84 is provided only in the left cooling duct 8 to form the diversion passage is shown, but the diversion passage may be formed in the right cooling duct 9. However, when the cooling air discharge port 73 is greatly opened below the right cooling duct 9 as in the present embodiment, the cooling air easily spreads over the entire right cooling duct 9, so even if a shunt passage is not provided. Cooling air can be ejected from each jet port 93 in a well-balanced manner.

  Further, a circuit board 16 that performs energization control of the right heating coil unit 4 and the left heating coil unit 3 is accommodated, an introduction port (not shown) for introducing cooling air from the fan unit 6 into the inside, and cooling air A substrate case 7 having a cooling air outlet 73 for discharging the air to the outside is provided. The cooling air supplied from the fan unit 6 is guided to the right cooling duct 9 via the substrate case 7. For this reason, components mounted on the circuit board 16 that generates heat by driving can be cooled.

  In the above description, the built-in heating cooker has been described as an example, but the present invention can also be applied to a stationary heating cooker.

1 Body case, 2 Top plate, 2a Upper frame, 3 Left heating coil unit, 4 Right heating coil unit, 5 Electric heater, 6 Fan unit, 7 Board case, 8 Left cooling duct, 9 Right cooling duct, 10 Connection air passage 10a upper wall, 10b side wall, 10c side wall, 11 main body inlet, 12 main body outlet, 13 support plate, 14 grill heating chamber, 15 operation display section, 16 circuit board, 17 operation display board, 21 top plate inlet, 22 Top plate exhaust port, 31 Coil base, 32 Central heating coil, 33 Outer peripheral heating coil, 41 Coil base, 42 Heating coil, 61 Fan case, 62 Fan, 71 Left board case, 72 Right board case, 73 Cooling air outlet 81 Upper wall, 82 Outer peripheral wall, 83 Jet port, 83a Jet port, 83b Jet port, 84 Inner rib, 85 Coupling Part, 91 upper wall, 93 spout, 100 heating cooker, 200 air channel unit, 300 cooling duct.

Claims (8)

The body,
A top plate covering the upper surface of the main body;
A first heating coil and a second heating coil disposed in the body;
A blowing means for supplying cooling air into the main body;
A first cooling duct disposed below the first heating coil and formed with a plurality of jet openings for blowing out the cooling air supplied by the blowing means toward the first heating coil;
A second cooling duct which is disposed below the second heating coil and has a plurality of jet ports formed by ejecting the cooling air supplied by the blowing means toward the second heating coil;
A connecting portion for communicating the first cooling duct and the second cooling duct;
The second cooling duct is configured to be relatively large with respect to the first cooling duct, and the cooling air supplied by the blower means passes through the first cooling duct and the connecting portion. A heating cooker arranged to be led to the second cooling duct. The cooking device according to claim 1, wherein the second heating coil has a relatively large diameter with respect to the first heating coil. The total area of the jet port of the first cooling duct is set so that the cooling air jetted from the jet port of the second cooling duct is larger than the cooling wind jetted from the jet port of the first cooling duct. The cooking device according to claim 1 or 2, wherein the cooking device is a cooking device. The cooking device according to any one of claims 1 to 3, wherein a shunt passage for shunting cooling air in the cooling duct is provided inside the second cooling duct. The second heating coil includes a plurality of heating coils,
The shunt passage for shunting the cooling air in the second cooling duct is provided in the second cooling duct so as to correspond to the plurality of heating coils. The heating cooker as described in any one of Claims. The second heating coil includes a central heating coil having a circular shape in plan view, and an outer peripheral heating coil disposed on an outer periphery of the central heating coil.
Inside the second cooling duct is formed in a plan view arc shape having substantially the same diameter as the central heating coil, and the cooling air in the second cooling duct is made to correspond to the central heating coil and the outer peripheral heating coil. The wall part which forms the shunt path which shunts is provided. The heating cooker as described in any one of Claims 1-3 characterized by the above-mentioned. The flow path cross-sectional area of the portion where the cooling air flows toward the connection portion in the first cooling duct and the flow path cross-sectional area of the connection portion are configured to be substantially the same. The cooking device according to any one of claims 1 to 6. A circuit board for controlling energization of the first heating coil and the second heating coil is accommodated, and an inlet for introducing cooling air from the air blowing means into the inside, and the cooling air in the first cooling duct And a substrate housing portion having a discharge port for discharging toward the
The cooling air supplied by the air blowing means is guided to the first cooling duct via the substrate housing portion. The cooking according to any one of claims 1 to 7, vessel.

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