JP2016162703A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker that enables both of a roaster design having a high degree of freedom of arrangement and reduced noise of an air blowing fan by increasing the size of a roaster, installing and locating the roaster in the vicinity of the center portion of a housing or the like.SOLUTION: In an induction heating cooker including, in a main body below a top plate 2 having a heating target mounted on the upper surface of the main body, a heating coil 13a for generating induction magnetic field to heat the heating target, an inverter circuit for supplying electric power to a heating coil, temperature detection means for detecting the temperature of the heating target, control means for controlling the inverter based on the detection result of the temperature detection means, and a roaster having heating means below the heating coil, the inverter circuit is disposed between the top plate and the roaster, an air blowing fan 20 is disposed below the inverter circuit and on the side surface of the roaster, and an air flow passage passing via the outside of the main body, the inverter circuit, the heating coil and the temperature detection means is formed through the air blowing fan.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an induction heating cooker.

  In this type of conventional induction heating cooker, as shown in Patent Document 1, a top plate for placing a heated container is arranged on the upper surface of the main body, and an induction heating coil is arranged below the top plate, An induction heating cooker in which a plurality of electronic boards that drive the induction heating coil, a turbofan that cools the induction heating coil and the electronic board are arranged in the main body, two induction heating units, and one A heater heating unit and one roaster are provided.

  In induction heating cooking not equipped with a roaster, as shown in Patent Document 2, a top plate on which a cooking container is placed, a heating coil that is provided below the top plate and heats the cooking container, and the top plate An infrared sensor unit provided below and having an infrared sensor for detecting infrared rays that have passed through the top plate radiated from the cooking container; an inverter including a switching element for supplying a high-frequency current to the heating coil; and the switching element A control circuit that adjusts the control heating power according to the output of the infrared sensor, a heat sink that fixes and cools the switching element disposed below the heating coil, and a blower that blows cooling air from the outlet A configuration with a fan is known.

Japanese Patent Laid-Open No. 2005-302407 JP 2014-135119 A

  A conventional induction heating cooker equipped with a roaster is provided with a heating coil for heating the pan and a radiant heater for heating the pan with the heat of the heater below the top plate on which the pan is placed as in Patent Document 1. A configuration is known in which a roaster for heating fish or meat is disposed below the left heating coil. An induction heating cooker equipped with a roaster is known to have a configuration in which a plurality of electronic boards that drive a heating coil and a blower fan that cools the induction heating coil and the electronic board are arranged below the right coil and on the side of the roaster. It has been. The induction heating cooker has provided high heating power and high safety induction heating technology by developing a control function of the heating power and pan temperature for heating the pan placed on the top plate. In addition, there is a need for an induction heating cooker that is easy to use, such as increasing the size of the roaster cabinet and expanding the automatic cooking menu. As the volume of the roaster increases, large fish and pizza can be cooked and the cooking menu increases. Moreover, even when a plurality of ingredients are cooked, it is possible to cook at one time, and cooking costs can be shortened and cooking can be performed with a small amount of power consumption, so that the electricity bill can be reduced.

  The shape of the bottom of the conventional roaster cabinet is a rectangle with a small width with respect to the depth. Since the induction heating cooker requires a space for arranging an electronic substrate such as an inverter on the side surface of the roaster as shown in Patent Document 1, the roaster has a shape having a narrow width with respect to the depth. Therefore, it is difficult to expand the volume in the roaster cabinet by expanding the width of the roaster to the same depth and making the bottom shape in the roaster cabinet close to a square.

As a solution to the above problem, a combination in which an inverter board and a blower fan are arranged below the heating coil of Patent Document 2 in the upper part of the roaster cabinet can be considered. In this case, the blower fan is housed in the space between the top plate and the roaster (about 60 to 70 mm), and the fan diameter of the blower fan is smaller than the configuration of Patent Document 1 and the like. When the induction resistance of the induction heating cooker is the same and the same air volume is taken as the operating point, the fan is operated at an increased rotational speed if the fan diameter is small. When the rotational speed is increased, the fan noise increases in proportion to the rotational speed. From the viewpoint of usability, it is important to reduce the noise of the operation of the induction heating cooker. The operating noise of the induction heating cooker is a noise source due to fluid noise or motor noise generated by a blower fan that cools an electronic board such as a heating coil or an inverter. Therefore, there is also a problem of reducing the operation noise of the blower fan in order to expand the volume of the roaster.

The present invention has been made to solve the above-described problems, and is provided on the upper surface of the main body, on which a heated object is placed, and on the lower side of the top plate, which guides the heated object. A heating coil for heating; an inverter circuit for supplying electric power to the heating coil; temperature detecting means for detecting the temperature of the object to be heated; and control means for controlling the inverter based on a detection result of the temperature detecting means; An induction heating cooker comprising: a roaster provided below the heating coil; and the inverter circuit, the heating coil, and a blower fan that cools the temperature detecting means, wherein the inverter circuit is located below the top plate And it arrange | positions above the said roaster and does not arrange | position at the substantially same height as the said roaster, but the said ventilation fan is substantially the said roaster. Flip disposed height, through the blowing fan, the body outside the inverter circuit, the heating coil, in which air path passing through said temperature detecting means is formed.

  According to the present invention, an inverter or an electronic board for driving a heating coil is disposed between the top plate and the roaster, and the blower fan is disposed below the inverter and on the side surface of the roaster so that the width of the roaster is approximately the same as the depth. It can be expanded and the capacity of the roaster cabinet can be increased. By expanding the internal volume, large-scale ingredients can be cooked to increase the number of cooking menus for roasters, making it possible to cook large quantities or multiple ingredients at once, enabling cooking with less cooking time and less power consumption. It becomes. In addition, it is possible to design the placement position of the roaster in the vicinity of the central portion of the housing, and the placement of the roaster can be freely adjusted, so that it is possible to provide an induction heating cooker with high design.

  In addition, according to the present invention, since the blower fan can be arranged in the space below the roaster side surface and the inverter board, a fan with a large outer diameter of about the roaster height can be designed. Can design. In addition, the resistance placed around the fan intake / exhaust is minimized, the ventilation resistance near the fan intake / exhaust port is reduced, turbulent noise can be suppressed, the roaster is expanded, and the operation noise is reduced. A small induction cooker can be provided.

The perspective view which shows the structure of the induction heating cooking appliance of Example 1. FIG. The top view except the top plate of the induction heating cooking appliance of Example 1. The block diagram explaining the heating part of the cooking-by-heating machine of Example 1, and its control. Sectional drawing centering on the right heating coil of the induction heating cooking appliance of Example 1. The top view except the top plate and heating coil unit of the induction heating cooking appliance of Example 1. Sectional drawing which mainly made the left and right heating coils of the induction heating cooking appliance of Example 2 Sectional drawing mainly using the ventilation fan of the induction heating cooking appliance of Example 2. The top view except the top plate and heating coil unit of the induction heating cooking appliance of Example 2. The perspective view which shows the structure of the induction heating cooking appliance of Example 3. Sectional drawing centering on the right heating coil of the induction heating cooking appliance of Example 3.

  Embodiments of the present invention will be described with reference to the drawings.

  The first embodiment will be described below with reference to FIGS.

  FIG. 1 is an inclined view of the main body 1 of the induction heating cooker according to the first embodiment. In the following description, an induction heating cooker having three pot places where induction heating can be performed will be described as an example. However, the application target of the present invention is not limited to this, and a single hole at the center rear is used as a radiant heater or a halogen heater. It may be a pan place that can be heated by radiant heat from a heater (heating source). The cooking pan (not shown) may be a magnetic iron pan suitable for induction heating, or a non-magnetic aluminum pan or copper pan.

  In this embodiment, a built-in type induction heating cooker that fits into the kitchen is used, but a stationary type that is placed in the kitchen may be used.

  A cooking pot for an object to be heated when cooking is placed on the top plate 2 on the upper surface of the main body 1. A cooking pan (not shown) can be cooked by being placed on the placement portion 3 drawn on the top plate 2. In the placement unit 3, a right placement unit 3a and a left placement unit 3b are disposed in front of the top surface of the top plate 2, and a central placement unit 3c is located at the back (center rear) between the placement units 3a and 3b. Is arranged. And the heating coil unit 25 shown in FIG. 2 mentioned later for heating a cooking pan under each mounting part 3 on both sides of the top plate 2 is each installed.

  The center placing part center 3c is a place where it is difficult to reach the position of the cook. For this reason, when the cooking pan is placed on the right placing part right 3a and the left placing part left 3b in front, when reaching the center placing part center 3c, the right placing part right 3a and left placing It is difficult to perform cooking in which the hand is moved at the center mounting portion center 3c by steam generated during cooking from the cooking pan placed on the mounting portion left 3b. Therefore, the kind of cooking performed in the center mounting part center 3c is suitable for cooking that does not require much movement by the chef, mainly cooking such as stew and heat insulation. Moreover, in order to suppress that the boiling power and heat retention require only a small heating power and the maximum power consumption is limited, the heating power of the center mounting portion center 3c is controlled from the right mounting portion right 3a and the left mounting portion left 3b. It is set to be weaker and smaller and to reduce power consumption.

  Infrared transmitting windows 16 are provided on the right mounting portion 3 a and the left mounting portion 3 b on the top plate 2. The infrared transmission window 16 is where the infrared rays radiated from the bottom of the cooking pan are transmitted. In the main body 1, the pan temperature is measured by detecting the amount of infrared energy transmitted through the infrared transmission window 16. The top plate 2 is originally painted or printed with a specific design so that the inside of the main body 1 cannot be seen. In order to transmit infrared rays radiated from the bottom of the cooking pot to the lower part of the top plate 2, the infrared transmission window 16 is not subjected to a part of the coating and is applied with a material that transmits the infrared rays and the state of the material of the top plate 2. By the way.

  An exhaust port 5 for exhausting the cooling air that has cooled the inside of the main body 1 is provided at the rear of the main body 1.

  A roaster 6 for grilling fish, pizza or the like is provided below the left part of the main body 1. The roaster 6 has a box shape with an open front, and a heating element such as a sheathed heater ( A thermistor (not shown) for detecting the internal temperature is provided, and the front surface is closed by a door 6b to which a handle 6a is attached. The door 6b has a saucer (not shown) attached to the back side of the door 6b. The door 6b is housed in a cooking chamber so that it can be freely inserted and removed from the front opening, and food such as fish and pizza is placed on the grilled net and the saucer. Place and cook.

  A main power switch 9 for supplying power to the main body 1 is provided at the right front portion of the main body 1.

  FIG. 2 is a top view of the induction heating cooker excluding the top plate 2.

  Below the top plate 2, annular heating coil units 25 are arranged on the left and right sides of the upper part of the main body 1 and the central rear part, respectively, and the cooking pot placed on the top plate 2 is induction-heated by the heating coil 13. To do.

  The heating coils 13 arranged on the left and right and the central rear part are each composed of an annular inner heating coil 14 and an annular outer heating coil 16 arranged with an annular gap 15 provided outside thereof.

  The reason why the gap 15 is provided in the heating coil 13 is that the magnetic flux generated by the inner heating coil 14 and the outer heating coil 16 is dispersed to make the temperature of the cooking pan uniform.

  In addition, although each heating coil 13 was set as the structure which provides the clearance gap 15, it is not limited to this in particular. For example, the structure which is set as the heating coil 13 without the clearance gap 15 which wound the inner side heating coil 14 and the outer side heating coil 16 without the clearance gap may be sufficient.

  On the upper surface on the front side of the top plate 2, upper surface operation portions 7 a, 7 b, 7 c corresponding to the respective heating coils 13 and an upper surface operation portion 7 d corresponding to the roaster 6 are provided, and the heating coil 13 is energized. Setting and operation, heating of the roaster 6 and input of cooking conditions are performed. Also, corresponding upper surface display portions 8a, 8b, 8c, and 8d are provided in the vicinity of the upper surface operation portions 7a, 7b, 7c, and 7d, and display the energization states of the respective heating coils 13 and the roaster 6. To do.

  The upper surface operating unit 7a inputs the heating power of the heating coil 13a on the right side of the main body 1, the upper surface operating unit 7c inputs the heating power of the heating coil 13c at the center rear of the main body 1, and the upper surface operating unit 7b is input on the left side of the main body 1. The heating power of the heating coil 13b is input.

  Here, the control will be briefly described with reference to FIG. The operation / display unit 75 includes the upper surface operation unit 7 and the upper surface display unit 8 described so far. Menus, heating power information, cooking start / off information, etc., input by the operation unit of the operation / display unit 75 are sent as an input signal 80 to the control unit 74 described later, information recognized by the control unit 74, cooking progress, etc. Is sent to the operation / display unit 75 as a display signal 79 and displayed on the upper surface display unit 8.

  The control unit 74 controls the heating unit based on the contents set by the operation / display unit 75 and a program such as automatic cooking incorporated in advance. Based on the set content, cooking start / stop and heating power setting information is sent to an inverter control means 73 or heater control means 82 to be described later via a control signal 78 (control signal 85). And the control signal 78 (control signal 85) which carried the temperature information from the pan temperature detection apparatus 19 (temperature detection means inside the roaster 6 not shown) shown in FIG. 4 described later for detecting the temperature provided in the heating unit is received. To receive temperature information. Although not shown in the block diagram, the blower fan 20 shown in FIG. 4 to be described later is also controlled, and the blower fan 20 is operated during cooking.

  The inverter control unit 73 monitors and corrects the power setting to the heating coil 13, the start and stop of energization, and the power consumption of the heating coil 13 based on an instruction from the control unit 74. The inverter 72 is controlled by sending an inverter control signal 76 to the inverter 72. For monitoring and correcting the power consumption of the heating coil 13, the power consumption is calculated from the input current and input voltage of each heating coil 13 sent by the detection signal 77 from the inverter 72, which will be described later, and the heating power becomes the set value. Thus, an inverter 72 described later is controlled by an inverter control signal 76.

  The inverter 72 is means for supplying electric power to the heating coil 13 and supplies power to the heating coil 13 based on an instruction from the inverter control means 73. Similarly to the inverter control means 73, the inverter 72 is provided in each heating coil 13, and an inverter right 72a, an inverter left 72b, and an inverter means 72c are provided. Then, the input voltage and the input current of each heating coil 13 are detected and sent to the inverter control means 73 on each detection signal 77.

  The heater control means 82 controls ON / OFF of the heater 81 while monitoring the temperature in the cooking chamber of the roaster 6 based on the signal from the control means 74. The temperature inside the roaster 26 is detected by the temperature detection means, is input to the heater control means 82 by the detection signal 83, and ON / OFF of the power supply to the heater is controlled by an instruction by the control signal 85 from the control means 79. .

  The inverter 72, inverter control means 73, control means 74, and heater control means 82 are disposed on the inverter board 18 shown in FIG. As is clear from FIG. 4, the inverter board 18 is not provided at substantially the same height as the roaster 26, so that the size of the roaster 26 can be determined without being limited by the inverter board 18.

  FIG. 4 is a cross-sectional view in the center front-rear direction of the right heating coil unit 25a of the induction heating cooker.

  In the heating coil unit 25a, the heating coil 13a is installed on the coil base 17a. Further, the coil base 17a is biased in the direction of the top plate 2 by a plurality of springs (not shown), so that the heating coil 13a is substantially parallel to the top plate 2 and placed on the top plate 2. The gap between the cooking pan and the heating coil 13a is kept constant.

  The heating coil 13a is applied with a voltage of several hundred volts at a high frequency of several tens of kHz by the inverter means 100 described later, applies a high frequency magnetic field to the cooking pan to generate an eddy current in the cooking pan, and makes the cooking pan self Heat to exotherm.

  In the vicinity of the center of the heating coil 13a, a plurality of temperature sensors 12a composed of thermistors are provided in close contact with the lower surface of the top plate 2, and the temperature of the cooking pan placed above the heating coil 13a is determined. Detection is performed via the top plate 2. In the present embodiment, the thermistor is used as the temperature detecting means of the top plate 2, but the present invention is not limited to this, and a detector such as a thermocouple may be used. Note that the number of temperature sensors is not limited to two, and may be one or more.

  A sensor visual field cylinder 40 is provided in the gap 15 of the heating coil 13 a, and a pan temperature detecting device 19 is installed under the sensor visual field cylinder 40. The pan temperature detection device 19 is provided with an infrared sensor that detects the temperature of infrared rays radiated from the bottom of the cooking pan through the infrared transmission window 16 of the top plate 2 from the received infrared energy. The infrared radiant energy received by the pan temperature detector 19 includes radiant energy for disturbances such as the top plate 2 and the heating coil 13a in addition to the cooking pan. In the disturbance correction, a correction amount is calculated by a microcomputer inside the main body 1 based on the temperature of the top plate 2 detected by the temperature sensor 12a. The temperature of the cooking pan is obtained by subtracting the disturbance energy from the infrared radiation energy detected by the pan temperature detection device 19.

  Although not shown, the left heating coil unit 25b has the same configuration as the right heating coil unit 25a.

  Under the heating coil unit 25, a substrate on which the inverter is mounted and a radiation fin 22 for cooling the heat generated by the heating element are arranged. An inverter board 18 on which inverters for driving the left and right heating coils 13a and 13b and the central rear heating coil 13c are mounted is disposed.

  Electronic components for driving the heating coil right 13a, the heating coil left 13b, and the heating coil center 13c described in FIG. 3 are mounted on the inverter board 18, and the inverter right 72a, the inverter left 72b, the inverter center 72c, and the inverter A control means right 73a, an inverter control means left 73b, and an inverter control means center 73c are mounted.

  A blower fan 20 is disposed below the inverter board 18. The blower fan 20 of the present embodiment will be described using a centrifugal fan through which air passes in the radial direction, but an axial fan through which air passes through in the axial direction may be used.

  An intake port 7 is provided on the back surface of the main body 1. The outside air of the main body 1 is taken into the main body 1 by driving the blower fan 20 through the intake port 7 and sucked into the blower fan 20.

  Between the upper part of the inverter board 18 and the left and right heating coil units 25, a duct 31 for guiding the cooling air from the blower fan 20 to the heating coil right 13a and the heating coil left 13b is disposed.

  The duct 31 is provided with an opening 32 for taking cooling air into the blower outlet 30 side of the blower fan 20. The opening part 32 and the blower outlet 30 form the joined air path. Generally, a heat generating element that requires the heat radiation fins 22 has a large amount of heat generation, and therefore is disposed in the vicinity of the opening 32 and is directly cooled by air from the blower fan 20.

  A coil outlet 33a is opened at the lower portion of the heating coil right 13a. A sensor guide 34a is disposed at the coil outlet 33a. An opening 35 a is provided above the pan temperature detection device 19.

  Here, the flow of the cooling air below the right heating coil will be described. The air sent by the blower fan 20 flows into the opening 32 of the duct 31 and cools the electronic components of the inverter board 18, and then passes from the lower side of the right heating coil unit 25 a to the top plate 2 through the coil outlet 33 a. Then, cooling air is blown to cool the heating coil right 13a. A part of the cooling air in the duct 31 is guided to the sensor guide 34 a and blows the cooling air to the pan temperature detecting device 19, and is also guided to the sensor visual field cylinder 40 through the opening 35 a above the pan temperature detecting device 19 and the top plate. 2 and the pot temperature detector 19 are cooled. By cooling the sensor visual field cylinder 40, heat disturbance that becomes infrared energy other than the cooking pot can be reduced, so that the accuracy of measuring the pot temperature detected by the pot temperature detecting device 19 is improved. Also on the heating coil left 13b side, the same cooling effect as that of the heating coil right 13a is obtained.

  In addition, the pan temperature detection device 19 of the present embodiment is arranged so that the sensor guide 34a is placed. However, if the above-described flow of cooling air is obtained, the pan temperature detection device 19 is installed on the heating coil unit 25 side. Also good.

  FIG. 5 is a top view of the induction heating cooker of FIG. 2 excluding the heating coil.

  A coil outlet 33a and an opening 35a are opened on the right side, and a coil outlet 33b and an opening 35a are opened on the left side of the upper surface of the duct 31 disposed above the inverter board 18.

  Similarly to the heating coil right 13a, the lower part of the heating coil left 13b is also provided with a coil outlet 33b. A sensor guide 34 b is disposed at the coil outlet 33 b, and an opening 35 b is provided above the pan temperature detection device 19.

  An air path guide 36 is arranged at the lower part of the heating coil right 13a of the duct 31 and guides the cooling air from the blower fan 20 supplied from the opening 32 to the left heating coil side. The lower part of the heating coil left 13b is provided with an air passage guide 37, which guides the cooling air to the left coil outlet 33b. An opening 38 is provided on the downstream side of the duct 31, and air that has cooled the inverter board 31 is discharged to the outside of the duct 31.

  The opening of the duct 31 of the present embodiment is the openings 32 and 38, the coil outlet 33, and the outlet 35, but the opening portion is not limited to this, and if the above cooling effect is obtained, the opening is opened. May be provided in addition to the above.

  A power supply board 26 for supplying power to the inverter board 18 and the like is disposed behind the left heating coil 13b. Since the power supply board 26 generates less heat than the inverter board 16, the power supply board 26 can be cooled by the cooling air flowing inside the main body 1 even when installed outside the duct 31. In this embodiment, the inverter board 18 and the power supply board 26 are used as two boards. However, the number of boards is not limited to this, and the inverter center 72c may be arranged separately on another inverter board. .

  With the above configuration, the flow of air inside the main body 1 sucked from the air inlet 7 will be described.

  By driving the blower fan 20, the outside air for cooling sucked from the air inlet 7 flows into the duct through the opening 32, and heats the circuit components of the left and right inverters on the inverter board 18 and the central inverter and each control means. While stealing, the air channel guide 36 and the wall surface of the duct 31 deflect the flow, and then pass through the opening 38 on the downstream side of the duct 31 to cool the power supply board 26 and the central heating coil unit 25c. Exhaust from the exhaust port 5 to the outside. Further, part of the cooling air in the duct 31 flows into the left and right coil outlets 33 to cool the left and right heating coils 13. A part of the cooling air in the duct 31 flows into the left and right sensor guides 34 and cools between the pan temperature detecting device 19 and the top plate 2. The cooling air that has cooled the heating coil 13 and the pan temperature detection device 19 is discharged from the exhaust port 5 to the outside.

  In this embodiment, the duct 31 is installed below the left and right heating coil units 25, and the inverter board 18 is housed to protect the board from the radiant heat from the heating coil 13 during cooking, and the air duct 36 in the duct 31 An air passage through which the cooling air passes is formed by the left and right coil outlets 33 and the sensor guide 34 so that the cooling air can be efficiently distributed to the substrate, the heating coil unit, and the pan temperature detecting device.

  The conventional induction heating cooker like patent document 1 was arrange | positioned in the space of a roaster side surface by the structure which arrange | positions an inverter board of right and left, and a center as an independent board respectively, but as shown in the present Example. By reducing the number of inverter boards 18, power supply boards 26, and the number of boards to two, etc., wiring to connect each board can be reduced, electronic parts such as connectors can be reduced, and electronic parts are consolidated in the same layer. Wiring is shortened and an inverter board can be manufactured at low cost. Further, the assembly cost can be reduced because the assembly time can be shortened by reducing the number of electronic parts such as inverter parts.

  When the duct 31 is made of nonmagnetic metal aluminum, interference of electromagnetic noise between the heating coil 13 and the inverter board 18 can be reduced, and the magnetic shielding effect of the pan temperature detecting device 19 can be obtained.

  Further, a main part installed in a space opposite to the roaster 6 below the inverter board 18 in the main body 1 is a blower fan 20. Since the side surface portion of the roaster 6 can be arranged at a position that does not block the flow of air flowing into the blower fan 20 from the air inlet 7 of the main body 1, the roaster 6 extends from the left side surface of the main body 1 to the vicinity of the blower fan 20. In range, for example, the width of the roaster 6 can be designed to be the same length as the depth, the size of the roaster 6 can be increased, and the installation position of the roaster 6 can be arranged near the center of the housing. Get higher.

Further, the blower fan 20 of this embodiment can be designed in a range of about 200 mm in height from the top plate 2 to the bottom surface of the main body 1. Here, the fan diameter D ₁ of the present embodiment. On the other hand, when the inverter board and the blower fan are arranged in the same layer between the top plate and the roaster, the height of the blower fan must be designed in the range of 60 to 70 mm. In this case, the fan diameter D ₂ and To do.

When the fan diameter D ₁ , fan rotation speed N ₁ , and air volume Q ₁ are large, and the fan diameter D ₂ , fan rotation speed N ₂ , and air volume Q ₂ are small, the relationship between fan diameter and air volume is as follows. It can be expressed as Q ₁ = Q ₂ × (D ₁ / D ₂ ) ³ × (N ₁ / N ₂ )
In the case of the design of the air volume Q ₁ = Q2, since D ₁ > D ₂ , the fan diameter D ₁ of the present embodiment having a large fan diameter can set the rotation speed N ₁ to be lower than the fan diameter D _2. . Here, the fan noise is proportional to the rotational speed N of the fan. According to the present embodiment in which the fan rotation speed N can be set small, it is possible to design a fan with a low rotation speed, and to provide an induction heating cooker with a low operation sound of the fan and the motor.

  A second embodiment will be described with reference to FIGS. 6, 7, and 8. FIG. Example 2 is the content regarding arrangement | positioning and the blowing direction of the ventilation fan 20 demonstrated in Example 1. FIG. Note that the description of the points in common with the first embodiment will be omitted.

  FIG. 6 is a central cross-sectional view in the left-right direction of the left and right heating coil units of the induction heating cooker.

  In the lower part of the heating coil unit 25 in FIG. 6, a substrate on which an inverter is mounted and the radiation fins 22 are described. An inverter board 18 on which inverters for driving the left and right heating coils 13a and 13b and the central rear heating coil 13c are mounted is disposed. The heat dissipating fins 22 are arranged with fins that reduce the ventilation resistance of the cooling air from the right heating coil unit 25a to the left heating coil unit 25b. Although the shape of Example 1 and the inverter board 18 are different, the control means of the heating coil 13 is the same as that of FIG.

  The duct 41 is an air path that guides air from the blower fan 20 to the inverter board 18, the left and right heating coil units 25, and the pan temperature detection device 19.

  Between the upper part of the inverter board 18 and the left and right heating coil units 25, a duct 41 that guides the cooling air from the blower fan 20 from the heating coil right 13a to the heating coil left 13b is disposed.

  The duct 41 is provided with an opening 42 for taking cooling air into the blower outlet 30 side of the blower fan 20. The opening 42 forms an air passage that is connected to the air outlet 30. A coil outlet 33a is opened at the lower portion of the heating coil right 13a. A sensor guide 34 a is arranged at the coil outlet 33 a, and an opening 35 a is provided above the pan temperature detection device 19. Similarly, the coil blower outlet 33b is opened in the lower part of the left heating coil 13b. A sensor guide 34 b is disposed at the coil outlet 33 b, and an opening 35 b is provided above the pan temperature detection device 19.

  FIG. 7 shows a cross-sectional view of the main body 1 in the center and the left-right direction of the blower fan 20.

  The air inlet 7 on the back side of the main body 1 and the fan air intake portion 20a of the blower fan 20 are arranged to face each other.

  FIG. 8 is a top view excluding the heating coil unit 25 of FIG.

  The duct 41 is provided with a coil outlet 33c below the central heating coil unit 25c. An air path guide 43 that guides cooling air to the left coil outlet 33b and an air path guide 44 that guides cooling air to the central coil outlet 33c are formed inside the duct 41. An opening 45 is provided on the downstream side of the duct 41, and air that has cooled the inverter board 18 is discharged out of the duct 41.

  The flow of the cooling air in the left and right heating coils 13 and the pan temperature detecting device 19 is the same as in the first embodiment.

  With the above configuration, the flow of air inside the main body 1 sucked from the air inlet 7 will be described.

  By driving the blower fan 20, the outside air for cooling sucked from the air inlet 7 flows into the duct 41 through the opening 42, and heats the circuit components of the left and right and center inverters on the inverter board 18 and each control means. , While passing through the opening 45 on the downstream side of the duct 41, the power supply substrate 26 is cooled and discharged to the outside from the exhaust port 5 behind the top plate 2. Further, a part of the cooling air in the duct 41 flows into the left and right and the coil outlets 33 at the center and cools the left and right heating coils 13. A part of the cooling air in the duct 41 flows into the left and right sensor guides 34 and cools between the pan temperature detecting device 19 and the top plate 2. The cooling air that has cooled the heating coil 13 and the pan temperature detection device 19 is discharged from the exhaust port 5 to the outside.

  In this embodiment, the duct 41 is installed on the lower side of the left and right heating coil units 25, protects the substrate from the radiant heat from the heating coil 13 during cooking by housing the inverter substrate 18, and the air duct 43 in the duct 41, 44, the right and left, and the coil outlet 33 and the sensor guide 34 in the center form an air passage through which the cooling air efficiently passes through the substrate, the heating coil unit, and the pan temperature detecting device.

  Since all the circuits cannot be accommodated in the duct 41, a power supply equipped with one part of a circuit that does not generate extremely heat, a part that does not carry a large current, a control circuit that rectifies the entire heating cooker system, a rectifier circuit, etc. The substrate 26 is installed in the vicinity of the exhaust port 5.

  In this embodiment, the opening of the duct 41 is the openings 42 and 45, the coil outlet 33, and the outlet 35. However, the opening is not limited to this, and the above cooling effect can be obtained. Alternatively, it may be formed by providing other openings.

The difference from the first embodiment is that the rotation shaft of the blower fan 20 and the fan air intake portion 20a are in the front-rear direction of the main body 1. Therefore, even if the roaster 6 is enlarged to the vicinity of the blower fan 20, An air passage that largely deflects the flow of air flowing into the air 20 is not possible. For this reason, since the ventilation resistance of the air intake passage of the blower fan 20 can be reduced as compared with the first embodiment, the fan rotation speed N can be reduced compared to the first embodiment, and the operation sound of the fan and the motor can be reduced.

  A third embodiment will be described with reference to FIGS. The third embodiment relates to a configuration in which a plurality of intake ports are added to the first embodiment to expand the intake area. Note that the intake port of the present embodiment may be applied to the second embodiment. Further, the description of the points in common with the previous embodiment will be omitted.

  FIG. 9 is an inclined view of the main body 1 of the induction heating cooker. An intake port 50 made of a plurality of openings and an intake port 51 made of a plurality of openings are arranged in front of the lower surface of the top plate 1 of the main body 1 on the right side surface of the main body 1.

  External air on the right side surface of the main body 1 is taken into the main body 1 by driving the blower fan 20 through the air inlet 50. External air on the front surface of the main body 1 is taken into the main body 1 by driving the blower fan 20 through the air inlet 51.

FIG. 10 shows a cross-sectional view in the front-rear direction of the center of the right heating coil unit 25a of the induction heating cooker.
In addition to the intake port 9 described in the first embodiment, an intake port 52 including a plurality of openings is provided on the bottom surface of the main body 1. External air on the bottom surface of the main body 1 is taken into the main body 1 by driving the blower fan through the air inlet 52.

  With the above configuration, in the air path from the blower fan 20 to the exhaust port 5 that takes air into the main body 1 sucked from the four places of the intake ports 7, 50, 51, 52, the inverter board 18 is the same as in the first embodiment. The heating coil unit 25 and the pan temperature detecting device 19 are cooled.

  Although this embodiment is described as four intake ports, it is sufficient that two or more intake ports are open, and if a plurality of intake ports can be formed, the intake ports 7, 50, 51, 52 can be freely combined. good.

  By arranging a plurality of intake ports of the main body 1, the opening area of the intake port of the main body 1 is increased, and the ventilation resistance of the air path through the outside air of the main body 1 and the blower fan 20 can be reduced. Since the ventilation resistance of the intake air flow path of the blower fan 20 can be reduced, the fan rotation speed N can be further reduced as compared with the first embodiment, so that the operation sound of the fan and the motor is reduced.

Further, when the main body 1 is incorporated in the kitchen, the air on the front surface of the main body 1 can be taken in from the intake port 51, so that the temperature rise of the air sucked by the blower fan 20 is suppressed, and the inverter board 18, heating coil unit 25, pan temperature An effect of stabilizing the cooling performance of the detection device 19 is obtained.

DESCRIPTION OF SYMBOLS 1 ... Main body of induction heating cooker 2 ... Top plate, 2a ... Lower surface 3 of top plate ... Heating coil 3a ... Inner heating coil, 3b ... Gap, 3c ... Outer heating coil 5 ... Exhaust port 6 ... Grill warehouse 6a ... Handle, 6b: Grill doors 7a, 7b, 7c ... Upper surface operation units 8a, 8b, 8c ... Upper surface display unit 9 ... Main power switch 10 ... Front operation unit 12 ... Temperature sensor 13 ... Heating coil 14 ... Inner heating coil 15 ... Gap 16 ... Outer Heating coil 17 ... Coil base 18 ... Inverter board 19 ... Pan temperature detector 20 ... Blower fan 30 ... Air outlet 31, 41 ... Duct 32, 38, 42, 45 ... Opening 33 ... Coil air outlet 34 ... Sensor guide 35 ... Air outlet 40 ... Sensor field cylinder 72 ... Inverter means 73 ... Inverter control means 76 ... Inverter detection signal 77 ... Detection signal 78 ... Control signal

Claims (4)

A top plate provided on the upper surface of the main body, on which an object to be heated is placed;
A heating coil provided under the top plate for inductively heating the object to be heated;
An inverter circuit for supplying power to the heating coil;
Temperature detecting means for detecting the temperature of the object to be heated;
Control means for controlling the inverter based on the detection result of the temperature detection means;
A roaster provided below the heating coil;
A blower fan that cools the inverter circuit, the heating coil, and the temperature detection means;
In an induction heating cooker equipped with
The inverter circuit is disposed below the top plate and above the roaster and not disposed at substantially the same height as the roaster,
The blower fan is disposed at substantially the same height as the roaster,
An induction heating cooker characterized in that an air passage is formed through the blower fan, outside the main body, through the inverter circuit, the heating coil, and the temperature detecting means. The induction heating cooker according to claim 1,
The induction heating cooker, wherein the air passage is an air passage formed between the temperature detecting means and the top plate. In the induction heating cooker according to claim 1 or 2,
The induction heating cooker, wherein the air passage also serves as a support for holding the temperature detecting means. In the induction heating cooker according to any one of claims 1 to 3,
An induction heating cooker characterized in that a part of the air passage is made of at least a non-magnetic aluminum material and is formed as a magnetic shield for the inverter circuit and the temperature detecting means.