JP2017068940A - Induction heating cooker - Google Patents

Abstract

An induction heating cooker capable of reducing noise of a fan device is provided. A main body, a grill house built in the main body, a top plate installed on the upper surface of the main body, a right heating coil, a left heating coil, a middle heating coil, and a left heating coil provided below the top plate, A left substrate 7b on which electronic components for supplying power to the middle heating coil are mounted; a right substrate 7a on which electronic components for supplying power to the right heating coil are mounted; and a fan device 9 for discharging cooling air to the heating coil and the substrate; The fan device 9 is provided with a discharge port for discharging cooling air in two directions from the position of the tongue portion 95d toward the reverse rotation direction of the impeller 91, and the discharge port far from the tongue portion 95d is on the left substrate side. The discharge port on the side close to the tongue 95d is directed to the right substrate side. [Selection] Figure 7

Description

  The present invention relates to a cooling structure for an induction heating cooker.

  A top plate is arranged on the upper surface of the main body, the main body is provided with a plurality of heating coils, and a board for driving and controlling each heating coil is stored in a plurality of stages in a space on the opposite side of the roaster from one end side of each board. A fan that rotates in the vertical direction is arranged to send cooling air.

JP 2011-3372 A

  In the conventional induction heating cooker shown in Patent Document 1, since the fan is provided close to one end of the substrate, the cooling air generated by the fan is divided later, for example, the stacked upper and lower substrates Had a problem that only inefficient cooling air generated at the tip of the fan could flow. For this reason, when a large amount of air is required, there is a need to increase the rotational speed of the fan, resulting in a problem that the noise is increased.

  In order to solve the above-mentioned problems, an induction heating cooker according to the present invention is provided with a main body, a grill box built in the main body, a top plate installed on the upper surface of the main body, and a lower portion of the top plate. The left heating coil, the left heating coil, the middle heating coil, the left board on which the electronic components for supplying power to the left heating coil and the middle heating coil are mounted, and the electronic components for supplying power to the right heating coil are mounted. And a fan device that discharges cooling air to the heating coil and the substrate. The fan device discharges cooling air in two directions from the position of the tongue toward the reverse rotation direction of the impeller. An outlet is provided, and a discharge port on the side far from the tongue is directed toward the left substrate, and a discharge port near the tongue is directed toward the right substrate.

  According to the present invention, since the cooling air discharged from the fan device can be used efficiently for cooling, the noise of the fan device can be reduced.

It is a perspective view of the induction heating cooking appliance which concerns on 1st Example of this invention. It is an exploded view of the induction heating cooking appliance shown in FIG. It is side surface sectional drawing cut | disconnected by the AA line shown in FIG. It is the top view which removed the top plate of the induction heating cooking appliance shown in FIG. FIG. 3 is an exploded perspective view of the fan device shown in FIG. 2. It is front sectional drawing cut | disconnected by the BB line shown in FIG. It is a layout of the board | substrate and fan apparatus in the board | substrate cover cut | disconnected by the DD line | wire shown in FIG. It is a perspective view of the heat sink which cools the high heat-emitting component shown in FIG. It is the top view which showed the flow of the air in an induction heating cooking appliance. It is side surface sectional drawing at the time of the heating coil installation of FIG. It is the top view which removed the heating coil of the induction heating cooking appliance shown in FIG. It is a lower side perspective view explaining the inside of a right board cover and a wind tunnel. It is a rear upper surface perspective view of a right board cover and a wind tunnel explaining a wind tunnel. It is an upper side perspective view explaining a left board cover. It is an upper surface perspective view of the induction heating cooking appliance shown in FIG. 11 explaining the drainage channel of a right board cover.

  Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In addition, with reference to the user's line of sight relative to the induction heating cooker Z (see FIG. 1), front and rear, up and down, and left and right are defined as shown in FIG.

  FIG. 1 is a perspective view of an induction heating cooker Z according to the present embodiment, and FIG. 2 is an exploded view of FIG. FIG. 4 is a top view of the induction heating cooker shown in FIG. 1 with the top plate removed. First, as an example, a case will be described in which the induction heating cooker Z (see FIG. 1) is a built-in type IH (Induction Heating) cooking heater provided with a grill 5 for heating an object to be cooked with an electric heater or the like.

  The induction heating cooker Z is an apparatus that generates an eddy current at the bottom of a cooking pot (not shown) made of metal and generates the cooking pot itself by Joule heat generated by the eddy current. The aforementioned eddy current is generated by changing the magnetic flux temporally by passing a high frequency current of about 20 kHz to 40 kHz, for example, through the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c. The induction heating cooker Z mainly includes a main body 1, a top plate 2, a right heating coil 3a, a left heating coil 3b, an intermediate heating coil 3c, a right substrate 7a placed on the substrate bases 73a and 73b, and a left A board 7b, a right board cover 6a, a left board cover 6b, and a fan device 9 are provided so as to cover the right board 7a and the left board 7b. The main body 1 is a housing having an outer shell corresponding to a space (predetermined left-right width, front-rear width, height) in which the induction heating cooker Z is installed, and has a box-like shape (concave shape) with an open top. Yes. On the main body 1, the lower left grille 5, the right board 7 a and the left board 7 b placed on the board bases 73 a and 73 b above the partition plate 1 b covering the grille warehouse 5, and the lower side constituting the fan device 9. The casing 90b and the impeller 91 are disposed in a planar shape, and the right discharge port 95a and the left discharge port 95b (FIG. 5) that are the outflow portions of the fan device 9 are disposed so as to include the surfaces of the right substrate 7a and the left substrate 7b. .

  The right board 7a and the left board 7b are covered with a right board cover 6a and a left board cover 6b, respectively, and an upper casing 90a that constitutes the fan device 9 is arranged alongside the right board cover 6a and the left board cover 6b. Above these, the right heating coil 3a, the left heating coil 3b, the middle heating coil 3c, the display unit P1, and the like are installed, and the top plate 2 is further installed so as to cover from above. Here, the electronic components 71 on the right board 7a and the left board 7b are used to supply a high-frequency current to the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c, and to drive the fan device 9. Integrated circuits, inverter circuits, capacitors, resistors, etc. The board bases 73a and 73b are insulating members (resin members) for fixing the right board 7a and the left board 7b, and are fixed to the inner wall of the main body 1 and the partition plate 1b.

  The right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c are installed below the top plate 2, and a temperature sensor 34 that detects the temperature of the pan bottom is installed near the center. Further, the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c are arranged on the downstream side of the fan device 9, and the cooling air blown from the fan device 9 is inside the right substrate cover 6a and the left substrate cover 6b. After cooling the right substrate 7a and the left substrate 7b, the right heating coil 3a and the left heating coil 3b are cooled via the upper discharge part 60a on the upper surface, and the middle heating coil 3c is cooled via the rear discharge part 60b of the wind tunnel 6c. It is like that. The right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c are coils through which high-frequency current flows by driving an inverter circuit described later, and are placed on the coil base 31. In this embodiment, the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c are provided one by one on the right, left, and center back in plan view. The coil base 31 is supported by three support portions 32 (for example, springs), and an upward biasing force is given by the support portions 32. Thereby, the heating coil is pressed against the lower surface of the top plate 2, and the distance between the cooking pot and the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c is kept constant.

  The grill compartment 5 on the left side of the front face of the main body 1 is provided with an insertion port (not shown) for sliding the article back and forth to install an object to be cooked (not shown). An operation panel P <b> 2 for mainly adjusting the heating condition in the grill 5 is provided on the front right side of the main body 1. The name of the grill box 5 may be a roaster or an oven.

  The top plate 2 is composed of a plate glass (not shown) on which the cooking pan is placed and a frame portion (not shown) that holds four sides of the plate glass, and is installed from above the main body 1. . The top plate 2 has a three-necked pan mounting unit 21 corresponding to the installation positions of the three right heating coils 3a, the left heating coil 3b, and the middle heating coil 3c, and an operation unit 22 for adjusting the heating of the cooking pan. And an exhaust opening H2. The exhaust opening H2 is a plurality of holes for discharging air blown from the fan device 9, and is provided at the rear (right side / left side) of the top plate 2. Since the exhaust opening H2 is located at the upper part of the fan device 9 and flows upward from below the main body 1, a low pressure loss of the exhaust air passage can be achieved.

  FIG. 3 is a sectional side view taken along line AA shown in FIG.

  An intake opening H <b> 1 for taking in air from the outside by driving the fan device 9 is provided on the back side of the main body 1. Air blown out from the fan device 9 into the main body 1 is discharged from an exhaust opening H2 provided behind the top plate 2.

  In addition to the rear of the main body 1, for example, if an intake opening is provided on the lower front side, relatively low temperature air can be easily taken into the main body 1. Further, by providing the intake opening H1 on the back side far from the grill 5 located on the left side (see FIG. 2), it is possible to make it difficult to suck in the high-temperature air taken in through the intake opening H1.

  FIG. 5 is a perspective view of the fan device 9 which is arranged substantially in a plane with the right substrate 7a and the left substrate 7b and is provided on the right side of the intermediate heating coil 3c on the side of the substrate bases 73a and 73b. The fan device 9 is a centrifugal fan including an impeller 91, casings 90 a and 90 b provided with the impeller 91 sandwiched therebetween, and a motor 92 that penetrates the casing 90 a and is connected to the impeller 91. That is, the impeller 91 is housed in a space surrounded by the casing 90a provided with the motor 92 and the casing 90b provided with the air inlet 9a, and the rotating shaft 92a of the motor 92 is prevented from contacting the casings 90a and 90b. Is supported rotatably. Therefore, the fan device 9 has the rotating shaft 92a of the impeller 91 in the vertical direction of the main body 1, the impeller 91 rotates in the horizontal direction and sucks in from below, and the reverse direction of the impeller 91 from the position of the side tongue portion 95d. A right discharge port 95a, a branch portion 95c, and a left discharge port 95b are provided on the side, and air is blown out in two directions. Further, the branch portion 95c is provided at a position farther from the rotation center of the impeller 91 than the tongue portion 95d. The intake port 9a of the casing 90b has a bell mouth shape (not shown). That is, the fan device 9 is disposed on the upstream side of the right substrate 7a and the left substrate 7b, and when the motor 92 is driven, air is taken in from the intake port 9a and separated from the right discharge port 95a and the left discharge port 95b in two directions. The cooling air is supplied toward the heat sinks 8a and 8b (see FIG. 2) of the right substrate 7a and the left substrate 7b.

  As shown in FIG. 3, a duct 23 is provided below the fan device 9, that is, between the intake port 9 a and the intake opening H <b> 1 of the main body 1. Even when the temperature rises, air having a low temperature can be sucked from the outside of the main body 1.

  The fan device 9 in induction heating cooking has a sufficient air flow resistance (for example, 100 to 200 Pa) in the main body 1, and the air flow necessary for cooling at a low speed rotation (the air flow characteristic of sufficient pressure-air flow). (E.g., 1.0 to 1.5 m <3> / min) is obtained, so that the right substrate 7a, the left substrate 7b, the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c can be efficiently cooled, and the operating sound during use This makes it easy to reduce noise.

  The air blown from the fan device 9 flows on the right substrate 7a installed in the gap between the substrate board 73a and the right substrate cover 6a (F1), and enters the right heating coil 3a installed on the right substrate cover 6a downstream thereof. It flows through the gap between the right substrate cover 6a and the top plate 2 (F2). In this embodiment, an upper discharge part 60a for supplying air from directly below toward the right heating coil 3a is provided on the upper surface of the right substrate cover 6a. The opening of the upper discharge part 60a faces directly above from the bottom of the right heating coil 3a.

  As shown in FIG. 3, the right discharge port 95a of the fan device 9 is configured such that the intake port 9a communicating with the impeller 91 is located below the substrate base 73a, so that air is inclined upward toward the right substrate cover 6a. Blown out.

  As shown in FIG. 3, the lower surface of the right discharge port 95a of the fan device 9 is disposed below the right substrate 7a, and the upper surface of the right discharge port 95a is disposed below the right substrate 7a. This configuration suppresses the temperature rise of the right substrate cover 6a, which is caused by providing the right substrate 7a and the right heating coil 3a close to each other via the right substrate cover 6a. Since the right heating coil 3a during induction cooking rises to a temperature close to about 200 ° C., the right substrate cover 6a rises in temperature due to the radiant heat of the right heating coil 3a. Therefore, the right discharge port 95a toward the right substrate cover 6a is configured, and the main flow is shifted to the right substrate cover 6a side, thereby suppressing thermal deformation due to radiant heat.

  In this embodiment in which the left substrate 7b is provided on the grill cabinet 5 and the right substrate 7a is provided on the same surface, the right heating coil 3a and the left heating coil are compared with the conventional configuration in which the substrates are stacked on the side of the grill cabinet 5. 3b, the distance between the middle heating coil 3c, the right board 7a, and the left board 7b is also close, so that it is easily affected by the temperature rise of the heating coil. By tilting to the left board cover 6b), heat transferred to the right board 7a and the left board 7b through the right board cover 6a and the left board cover 6b can be prevented, and the entire components in the main body 1 can be efficiently cooled.

  Here, the right heating coil 3a is cooled, and the air (F2) flowing through the gap between the right substrate cover 6a and the top plate 2 is discharged toward the exhaust opening H2 behind the main body 1. The exhaust opening H2 is covered with an exhaust cover 25 provided with a plurality of small-diameter holes in a metal plate, so that liquid (not shown) that flows when spillage or the like occurs on the top plate 2 is difficult to enter. ing. The exhaust cover 25 is detachable and can be removed and cleaned when it becomes dirty. Further, the liquid that has passed through the exhaust cover 25 is received by the water receiving portion 94 provided below the exhaust cover 25 so as to receive and buffer the dropped liquid droplets on a wide surface so that it does not flow into the fan device 9 side. Yes. A lattice-like partition 94 a is provided between the water receiving portion 94 and the motor 92 to suppress liquid intrusion into the main body 1.

  Further, in the configuration of the present invention, by disposing the fan device 9 in the vicinity of the exhaust opening H2, the distance from the right exhaust opening H2 to the right substrate 7a can be increased, and the liquid enters the charging part of the substrate. It has a difficult structure. Therefore, the possibility of liquid intrusion of the right substrate 7a with respect to the exhaust opening H2 can be extremely reduced, and this embodiment has a highly safe structure in which failure is unlikely to occur. In the left exhaust opening H2, as shown in FIG. 2, a water receiving portion 1a is provided on the partition plate 1b, and the droplets that have passed through the exhaust cover 25 fall to the rear of the grill box 5. Therefore, it is difficult to enter the left substrate cover 6b side.

  6 is a front cross-sectional view taken along line BB shown in FIG. The heating chamber 50 in the grill cabinet 5 is a space for arranging cooked food such as fish grill, for example, and an electric heater (upper heater 51 and lower heater 52) as a heat source and a grill on which fish and the like are placed. 54 and a tray 53 disposed below the grill net 54. As described above, the heating chamber 50 is arranged in the left region in the main body 1 in a plan view, and the inner tray 53 and the like can slide relative to the main body 1 in the front-rear direction.

  Note that the heat source of the heating chamber 50 is not limited to the electric heater, and the food may be heated by microwaves, water vapor, or a combination thereof. Further, a temperature controller may be provided and oven heating may be performed. In FIG. 1, the induction heating cooking appliance Z provided with the grill 5 with 1/2 or more of main body width was shown.

  As shown in FIG. 3, the fan device 9 for allowing air to flow through the right board 7a and the left board 7b on which the electronic component 71 is mounted, and the air path in the right board cover 6a and the left board cover 6b, Since it is arranged in the vicinity of the exhaust opening H2 of the top plate 2, the right region in the main body 1 shown in FIG. 6 showing the front cross section of the intermediate heating coil 3c is a space (chamber part F0). As shown in FIGS. 2, 3, and 4, in this embodiment, the right substrate 7a is disposed below the right heating coil 3a on the right side, and the left substrate 7b is disposed below the left heating coil 3b on the left side. An inverter circuit for supplying power to the right heating coil 3a on the right side is mounted on the right board 7a, and an inverter circuit for supplying power to the left heating coil 3b on the left side and the middle heating coil 3c on the back side is mounted on the left board 7b. The right substrate 7a and the left substrate 7b are respectively disposed in a space in which the substrate base 73a and the right substrate cover 6a, and the substrate base 73b and the left substrate cover 6b are vertically combined, and the space serves as an air flow path (F1). The right board cover 6a and the left board cover 6b have a structure that covers at least the upper surfaces of the charging parts of the right board 7a and the left board 7b.

  FIG. 7 is a layout of the board and the fan device in the board cover cut along the line DD shown in FIG. As shown in FIG. 7, the heat sink 8a of the right substrate 7a is disposed downstream of the right discharge port 95a of the casing 90a of the fan device 9, and the heat sink 8b of the left substrate 7b is disposed downstream of the left discharge port 95b. Has been. The heat sinks 8 a and 8 b are heat radiators that absorb heat from the high heat generating element 72, which is an electronic component with high heat generation, and dissipate heat to the air flowing in through the fan device 9. Each of the heat sinks 8a and 8b has fins (not shown) having a predetermined surface area, and is installed on the right substrate 7a and the left substrate 7b. The right discharge port 95a and the left discharge port 95b of the fan device 9 are divided into two portions facing the heat sinks 8a and 8b, and a predetermined flow rate of air is guided to the heat sinks 8a and 8b as the motor 92 is driven. Since the heat generating elements 72 constituting the inverter circuit are installed in the heat sinks 8a and 8b, high cooling performance can be obtained by arranging them on the most upstream side near the fan device 9.

  FIG. 8 is a perspective view of a heat sink that cools the high heat generating element 72 (72a, 72b, 72c, 72x) shown in FIG. 7, viewed from the left rear of the main body through the right substrate cover 6a and the left substrate cover 6b. It is. Ribs 60b extending downward (substrate side) may be provided on the upper wall surfaces of the right substrate cover 6a and the left substrate cover 6b. Ventilation ducts 65a and 65b are constituted by the surfaces where the ribs 60b or the heat generating elements 72 of the heat sinks 8a and 8b are attached and the outer walls of the right substrate cover 6a and the left substrate cover 6b.

  The heat sinks 8 a and 8 b are installed on the upstream side near the fan device 9. That is, the heat sinks 8a and 8b are arranged so that the high heat generating element 72 having the largest heat generation amount is first cooled by the air flowing in through the right discharge port 95a and the left discharge port 95b. As described above, the heat generating elements 72 can be effectively cooled by arranging the heat sinks 8a and 8b in the vicinity of the right discharge port 95a and the left discharge port 95b and concentrating the flow.

  In the present embodiment, an example in which a half bridge circuit of a current resonance inverter is configured by the number of high heat generating elements 72 shown in FIG. The heat sink 8a of the right substrate 7a cools the two IGBTs 72a and the diode bridge 72x that supply power to the right heating coil 3a. The heat sink 8b of the left substrate 7b cools the two IGBTs 72b, the two IGBTs 72c and the diode bridge 72x that supply power to the left heating coil 3b and the middle heating coil 3c. In this embodiment, the diode bridge 72x of the inverter that supplies power to the left heating coil 3b and the middle heating coil 3c is shared. The diode bridge 72x sharing is configured to be optimal on the single left substrate 7b, and as shown in FIG. 8, the high heat generating elements 72 are arranged in the longitudinal direction of the main body and used as a cooling air passage. ing.

  Since the fan device 9 is a centrifugal fan, two right discharge ports 95a and a left discharge port 95b are provided in the reverse rotation direction of the impeller 91 from the position of the tongue portion 95d, and the branch portion 95c is the rotation center of the impeller 91 from the tongue portion 95d. By providing at a farther position, the cooling air discharged from the discharge port can be more efficiently discharged from the left discharge port 95b more efficiently than the right discharge port 95a. For this reason, the electronic components of the substrate having a large heat generation amount and the substrate having a higher ambient temperature are cooled by the cooling air that can be efficiently discharged from the left discharge port 95b. The substrate is the left substrate 7b. The installation position of the left substrate 7b is provided above the grill cabinet 5, and when cooking is performed in the grill cabinet 5, the temperature of the lower surface of the left substrate 7b becomes high. Further, the left substrate 7b is provided with two IGBTs 72b and two IGBTs 72c for supplying power to the left heating coil 3b and the middle heating coil 3c, and a diode bridge 72x shared for supplying power to the two heating coils. Since the amount of electric power of the middle heating coil 3c is controlled much with respect to the right substrate 7a, the amount of heat generation is also large.

  By providing the above-described left substrate 7b in the left discharge port 95b on the side from which a large amount of cooling air can be efficiently taken, the fan device 9 can be easily designed, and the efficient fan device 9 is provided. 9 is also designed to reduce noise.

  FIG. 9 is a top view showing a flow in the main body 1 from the fan device 9 to the exhaust opening H2 through the top plate 2. FIG.

  As shown in FIG. 9, the air discharged from the fan device 9 flows from the rear to the front through the ventilation ducts 65a and 65b near the center of the left and right of the main body 1 (see FIG. 7). The air that has passed through the ventilation duct 65a is bent to the right side of the main body to cool the electronic component 71 (not shown) on the right substrate 7a in the right substrate cover 6a, and to the right heating coil 3a downstream thereof. Supplied. Further, the air is diverted from the air that has passed through the ventilation duct 65a, and is supplied to the intermediate heating coil 3c via the wind tunnel 6c that is bent to the left side of the main body and connected to the rear portion of the right substrate cover 6a.

  Further, the air that has passed through the ventilation duct 65b is bent to the left side of the main body to cool the electronic component 71 (not shown) on the left board 7b in the left board cover 6b, and to the left heating coil 3b downstream thereof. Supplied. That is, the cooling air of the fan device 9 is guided so that the main flow branches and flows left and right in the right substrate cover 6a and the left substrate cover 6b, so that the downstream exhaust opening H2 is efficiently downstream without crossing the flows. It is easy to be guided to. Further, in this configuration, the cooling air passage is composed of two layers in the right substrate cover 6a and the left substrate cover 6b (F1) and below the top plate 2 (F2). The number of parts that change the flow direction by colliding with the air flow is reduced, and a structure with reduced ventilation resistance can be realized.

  FIG. 10 is a side sectional view when the right heating coil 3a is installed as an example. As shown in FIG. 10, the right heating coil 3a is mounted on a coil base 31 in which rod-shaped ferrite 33, which is a magnetic material, is radially incorporated. For example, an elastic spring or the like is used to It is hold | maintained by the three support parts 32 via the support groove. The ferrite 33 is arranged so that the magnetic flux around the right heating coil 3a generated by the high-frequency current supplied from the right substrate 7a including the inverter to the right heating coil 3a is directed to the cooking pot. The ferrite 33 may be a fan shape instead of a rectangle with respect to the right heating coil 3a. If it is fan-shaped, it becomes easy to cover the lower surface of the right heating coil 3a with the ferrite 33, and magnetic flux leakage can be reduced. The support portion 32 is installed on the right substrate cover 6a, the left substrate cover 6b, and the casing 90a (see FIG. 2), and supports the coil base 31 from below. In the present embodiment, the support portion 32 is constituted by a spring inserted into the support groove, and while the right heating coil 3a is aligned, the coil base 31 is pressed against the top plate 2 side, and the right heating coil 3a and the top plate are pressed. 2 are in close proximity.

  Near the center of the coil base 31, a contact-type temperature sensor 34 such as a thermistor that indirectly detects the temperature of the cooking pot from the contact temperature with the top plate 2 is arranged via a sensor base. The sensor base is provided with a shaft portion (not shown) penetrating through the support hole 31b in the center of the coil base 31, and the temperature sensor 34 on the sensor base 34a is attached to the top plate 2 by a spring provided in the shaft portion. It is configured to press against. The smaller the gap between the right heating coil 3a and the top plate 2, the better the electrical coupling with the cooking pan. Therefore, the smaller the gap, the more efficient the heating. The right heating coil 3a of this embodiment has a configuration in which a litz wire obtained by twisting a plurality of strands is spirally wound, and the right heating coil 3a includes an outer litz wire 30a and an inner litz wire 30b. The structure is divided into multiple parts. The configuration as described above is an effective arrangement for uniformly heating the cooking pan. If a temperature sensor is separately provided between the outer litz wire 30a and the inner litz wire 30b, A sensor can be arranged at a position close to the maximum temperature part, and the cooking pot temperature can be appropriately controlled. Here, the temperature sensor may be a non-contact sensor such as an infrared sensor instead of the thermistor.

  On the other hand, when liquid enters due to cracks in the top plate 2, the electronic components 71 of the right substrate 7a and the left substrate 7b exposed from the upper discharge part 60a provided on the right substrate cover 6a and the left substrate cover 6b are protected. Therefore, a waterproof plate 35 larger than the outer shape of the right heating coil 3 a is installed in the right heating coil 3 a of the present embodiment in the gap with the top plate 2. The waterproof plate 35 is not limited as long as it is a material that does not affect induction heating of the cooking pot. For example, a mica plate is easy to manufacture because it is inexpensive and easy to mold. In addition, the waterproof board 35 is installed in the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c of the present embodiment. The upper board discharge part 60a of the right board cover 6a and the left board cover 6b provided below the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c is covered with a waterproof plate 35. Therefore, the liquid that enters through the top plate 2 above the right heating coil 3a, the left heating coil 3b, and the middle heating coil 3c does not enter the upper discharge part 60a, and the right heating coil 3a, the left heating coil 3b, It drops on the right board cover 6a and the left board cover 6b on the outer peripheral side of the middle heating coil 3c, and the charged parts of the right board 7a and the left board 7b are protected.

  As shown in FIG. 11, an opening 63 and an upper discharge part 60a are provided in the right substrate cover 6a and the left substrate cover 6b shown in the present embodiment. The openings provided above the right substrate cover 6a and the left substrate cover 6b are obtained by arranging a plurality of round holes at a plurality of locations. Although the area of one round hole is small, the whole is totaled and the right heating coil 3a and the left heating coil 3b are cooled. Moreover, the diameter of a round hole may be the same and may have a part from which a diameter differs. And since the opening area is large in total by arranging a set of a plurality of round holes at a plurality of locations, the overall ventilation resistance from the intake opening H1 to the exhaust opening H2 is reduced. For this reason, it is possible to efficiently blow air from the fan device 9 with less fan power. As shown in FIG. 10, since the cooling air can be supplied from below the right heating coil 3a, the right heating coil 3a can be efficiently cooled with a low pressure loss.

  12 is a perspective view of the lower side where the right board cover 6a and the wind tunnel 6c are connected, and FIG. 13 is a rear top perspective view of the right board cover 6a and the wind tunnel 6c.

  4 and 11, the positional relationship among the right substrate cover 6a, the wind tunnel 6c, and the intermediate heating coil 3c is shown as viewed from above. The right substrate cover 6a shown in FIG. 12 includes a connection port 6a4 that connects to the right discharge port 95a of the fan device 9, and a guide plate 6a5 that forms an outline of the right substrate cover 6a is provided in the front-rear direction. The front end of the guide plate 6a5 has an outlet 6a1 that opens to the left. An air passage is provided on the left side of the exit. 6a2 is a U-turn flow path by turning to the left from the outlet 6a1 at the front end and making a U-turn flow that flows backward. A connecting port 6a3 connected to the wind tunnel 6c is provided at the rear end of the U-turn flow path 6a2.

  The wind tunnel 6c of FIG. 13 is provided with a connection port 6c1 connected to the right substrate cover 6a on the front side, and a rear part includes a rear discharge part 60b. This rear discharge part 60b blows cooling air directly from the side surface of the intermediate heating coil 3c. As shown in FIG. 11, the position where the middle heating coil 3c is arranged is on the left side of the fan device 9, and the wind tunnel 6c uses the gap between the right discharge port 95a and the left discharge port 95b to branch the fan device 9. Arranged in front of 95c.

  Since the middle heating coil 3c is disposed behind the left discharge port 3b of the fan device 9, there is no air passage for blowing air from the lower surface. However, the middle heating coil 3c has an amount of heat as compared with the right heating coil 3a and the left heating coil 3b. Since there is little, it can cool by sending air back from the back discharge part 60b.

  FIG. 14 is a top perspective view of the left substrate cover 6b. A connection port 6b2 connected to the left discharge port 95b of the fan device 9 is provided on the right side surface of the left substrate cover 6b. A partition plate 6b1 is provided from the rear side of the connection port 6b2 to the vicinity of the center. This is because the left discharge port 95b of the fan device 9 is directed left front, so that it flows toward the heat sink 8b arranged on the front side without diffusing to the left side or the rear side in the left substrate cover 6b. An upper discharge part 60a is provided on the upper surface of the left substrate cover 6b. Further, a rib 60a1 is provided around the round hole of the upper discharge part 60a on the upper surface of the left substrate cover 6b. In the upper discharge part 60a, as shown in FIG. 12, only a hole is formed on the inner upper surface of the right substrate cover 6a. Similarly, the left substrate cover 6b has only a hole in the inner upper surface. When the air flowing inside discharges from the round hole, rather than only passing through the plate thickness of the upper surface (thickness because it is made of resin), it is preferable to pass through the plate thickness plus the height of the rib 60a1. This is because the flow is smoothed and the flow at the outlet on the upper surface (tip of the rib 60a1) becomes smooth. Further, like the rib 60a1, the rib 63a is provided around the opening 63, and water spilled on the upper surface of the left substrate cover 6b from the upper discharge portion 60a including the rib 60a1 and the opening 63 including the rib 63a It does not flow directly to the charging part of the left substrate 7b.

  FIG. 15 is a top perspective view of the induction heating cooker shown in FIG. 4 for explaining the drainage channel of the substrate cover.

  A drainage channel 6a7 is provided at the front ends of the left substrate cover 6b and the right substrate cover 6a in FIGS. 14 and 15 to allow water spilled on the left substrate cover 6b and the right substrate cover 6a to flow to the bottom of the main body 1. As a result, when the top plate 2 is cracked and water enters, not only does it not reach the charging part of the board, but also spills the water to the bottom of the main body 1 to the drain hole (not shown) at the bottom of the main body 1 It is what drains.

  A cooking pot is placed on the pan placing portion 21 of the top plate 2 (corresponding to the right heating coil 3a on the right side and the middle heating coil 3c on the rear side), and the operation portion 22 (see FIG. 1) is operated by the user. Thus, the heat treatment is started. The operation unit 22 is a touch key and can be operated by touching a key printed on the top plate 2.

  A high-frequency current is supplied from an inverter circuit to the right heating coil 3a and the middle heating coil 3c located below the cooking pan in response to a command from a control device (not shown), and the cooking pan is induction-heated. . When the cooking pan is induction-heated by the right heating coil 3a and the middle heating coil 3c, the high heating element 72 and the electronic component 71 constituting the inverter circuit generate heat in addition to the right heating coil 3a and the middle heating coil 3c. .

  With the start of the heat treatment, the fan device 9 is driven in response to a command from a control device (not shown). When the fan device 9 is driven, a negative pressure is generated at the inlet of the impeller 91, and the air that flows from the intake opening H1 through the duct 23 is taken into the fan device 9. The air discharged from the fan device 9 is divided into the ventilation ducts 65a and 65b in the right board cover 6a and the left board cover 6b, and absorbs heat from the heat sink 8a on the right board 7a. The high heat generating element 72 (72a, 72x) is cooled by heat dissipation through the heat sink 8a, and the other electronic components 71 mounted on the right substrate 7a are also cooled by heat exchange with air. The air that has cooled the right substrate 7a flows from the upper discharge portion 60a above the right substrate cover 6a toward the right heating coil 3a, cools the right heating coil 3a, and is then discharged through the exhaust opening H2. Further, the air is blown from the rear board discharge portion 60b of the wind tunnel 6c to the middle heating coil 3c through the U-turn flow path 6a2 through the U-turn flow path 6a2 and cooled to the intermediate heating coil 3c, and then passed through the exhaust opening H2. Discharged.

  The air discharged from the fan device 9 absorbs heat from the heat sink 8b on the left substrate 7b that generates heat by energizing the middle heating coil 3c. The high heat generating element 72 (72b, 72c, 72x) is cooled by heat dissipation through the heat sink 8b, and the other electronic components 71 mounted on the left substrate 7b are also cooled by heat exchange with air. The air that has cooled the left substrate 7b is discharged from the upper discharge portion 60a above the left substrate cover 6b through the exhaust opening H2 after cooling the middle heating coil 3c.

  According to the present embodiment, since the cooling air discharged from the fan device can be efficiently used for cooling, the noise of the fan device can be reduced.

  In addition, it is good also as a structure which reversed right and left the cooling structure of the induction heating cooking appliance demonstrated above.

DESCRIPTION OF SYMBOLS 1 Main body 2 Top plate 3a Right heating coil 3b Left heating coil 3c Middle heating coil 7a Right board 7b Left board 8a Heat sink 8b Heat sink 6a Right board cover 6b Left board cover 6a1 Outlet 6a2 U-turn flow path 6a5 Guide plate 9 Fan device 23 Duct 60a Upper discharge portion 95a Right discharge port 95b Left discharge port 95d Tongue

Claims (3)

The body,
A grill built in the main body;
A top plate installed on the upper surface of the main body;
A right heating coil, a left heating coil, and a middle heating coil provided below the top plate;
A left substrate mounted with electronic components for supplying power to the left heating coil and the middle heating coil;
A right substrate mounted with electronic components for supplying power to the right heating coil;
A fan device for discharging cooling air to the heating coil and the substrate;
The fan device includes
A discharge port for discharging cooling air in two directions from the position of the tongue to the reverse rotation direction side of the impeller is provided,
The discharge port on the side far from the tongue is directed to the left substrate side,
An induction heating cooker characterized in that the discharge port on the side close to the tongue is directed to the right substrate side. The body,
A grill built in the main body;
A top plate installed on the upper surface of the main body;
A plurality of heating coils provided below the top plate;
A board on which an electronic component that is disposed above the grill box and supplies power to the heating coil is mounted;
A fan device for discharging cooling air to the heating coil and the substrate;
The fan device includes
A discharge port for discharging a plurality of cooling air from the position of the tongue portion to the reverse rotation direction side of the impeller is provided,
An induction heating cooker characterized in that the discharge port on the side far from the tongue is directed to the substrate side. The body,
A grill built in the main body;
A top plate installed on the upper surface of the main body;
A plurality of heating coils provided below the top plate;
A left board on which an electronic component that is disposed above the grill box and supplies power to the heating coil is mounted;
A right substrate mounted with electronic components for supplying power to the right heating coil;
A fan device that is arranged on the side of the grill cabinet and sucks from below to discharge cooling air to the substrate,
The fan device includes
There are two outlets for discharging cooling air from the position of the tongue on the side of the impeller in the reverse rotation direction.
A branch portion is provided between the discharge port and the discharge port,
The branch is
An induction heating cooker provided at a position far from the distance from the rotation center of the impeller to the tongue.

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