Electromagnetic induction heating cooker

Abstract

To provide an induction heating cooker with a weighing function for measuring the weight of an object to be heated, the cooker being capable of reducing the influence of vibration and reaction force caused by driving a cooling fan on weighing and measuring the weight of the object to be heated more accurately.SOLUTION: The electromagnetic induction heating cooker according to the present invention includes: a heating and weighing unit 7 for hearing an object to be heated and weighing the object; a cooling mechanism 6 for performing air cooling on a heating unit 3 of the heating and weighing unit 7; a base member 8 supporting the heating and weighing unit 7 and the cooling mechanism 6; and a casing 1 surrounding side peripheries of the heating unit 3 and a weighing unit 4. The cooling mechanism 6 is arranged on an inner surface side of the casing 1 in a state of being out of contact with the heating and weighing unit 7.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic induction cooking appliance having a built-in cooling fan for cooling a heating coil and the like. [Background technology]

[0002] This type of electromagnetic induction cooking appliance (hereinafter referred to as "cooker") is disclosed, for example, in Patent Document 1. In this appliance, a rectangular box-shaped housing contains, from top to bottom, a heating coil, a heating coil support plate that supports the heating coil, and a control circuit, with a cooling fan (cooling device) housed on each side. A top plate on which a cooking vessel such as a pot is placed is provided on the top surface of the housing directly opposite the heating coil. An intake hole facing the cooling fan is provided on one side of the bottom surface of the housing, and a matching exhaust hole is provided on the other side of the top surface of the housing. The outside air taken in through the intake hole by the cooling fan is divided into two parts, one above the other below the heating coil support plate, and after cooling the heating coil on the upper side and the control circuit on the lower side, the two parts join together and are discharged from the exhaust hole.

[0003] The present invention also includes a weighing scale for measuring the weight of an object to be heated placed on the top plate. An electromagnetic induction cooking device equipped with such a weighing scale is disclosed, for example, in Patent Document 2. In the cooking device of Patent Document 2, the top plate is configured to move downward relative to the main body in proportion to the weight of the object to be heated placed on the top plate. The heating coil is supported on the underside of the top plate and moves up and down integrally with the top plate. The weight detection means includes a fixed electrode fixed to the inner bottom surface of the main body and a movable electrode facing the fixed electrode from above. When the top plate moves downward, the movable electrode is pressed down via a vertically elongated spindle, changing the distance between it and the fixed electrode and changing the capacitance between the two electrodes. The weight of the object to be heated placed on the top plate can be detected based on this change in capacitance. Patent Document 2 does not mention a cooling fan for air-cooling the heating coil or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 64-2289 [Patent Document 2] Microfilm of Utility Model Application No. 59-149289 (Utility Model Application No. 61-63796) Summary of the Invention [Problem to be solved by the invention]

[0005] It is believed that it would be possible to measure the weight of the heated object by, for example, placing a weighing scale below the housing in the cooker of Patent Document 1. However, because the cooling fan in the cooker of Patent Document 1 is located inside the housing, if a configuration in which a weighing scale is simply placed below the housing as described above is adopted, it is expected that vibrations generated by the cooling fan as the cooling fan is driven and reaction forces acting on the support structure that supports the cooling fan as the cooling fan is driven will act on the weighing scale through the housing, causing errors in the measured values of the weighing scale.

[0006] An object of the present invention is to provide an electromagnetic induction heating cooker that can more accurately measure the weight of an object to be heated by minimizing the effects of vibrations and reaction forces caused by driving a cooling fan. [Means for solving the problem]

[0007] The electromagnetic induction heating cooker according to the present invention comprises a heating and measuring section 7 consisting of a top plate 2 on which an object to be heated is placed, a heating unit 3 arranged below the top plate 2 to heat the object to be heated, and a measuring unit 4 arranged below the heating unit 3 to measure the weight of the object to be heated, a cooling mechanism 6 having a cooling fan 64 and a feed path 67 that guides air sent out from the cooling fan 64 to the heating unit 3 and performs air cooling for the heating unit 3, a base member 8 that supports the heating and measuring section 7 and the cooling mechanism 6, and a casing 1 that surrounds the sides of the heating unit 3 and the measuring unit 4. The cooling mechanism 6 is characterized in that it is arranged on the inner surface of the casing 1 in a state where it is not in contact with the heating and measuring section 7.

[0008] It is desirable to adopt a configuration in which the casing 1 is not in contact with the heating and measuring section 7.

[0009] Heating unit 3 includes heating coil 16 that generates an induction magnetic field above top plate 2, inverter board 17 that supplies high-frequency current to heating coil 16, and housing 21 that houses heating coil 16 and inverter board 17. Cooling mechanism 6 is formed along the inner surface of casing 1 and includes supply duct 55 that has supply path 67 and houses cooling fan 64. Air outlet 66 formed at the downstream end of supply duct 55 is closely opposed to air intake port 47 opened in housing 21 of heating unit 3.

[0010] The supply duct 55 extends in the vertical direction along the front wall 51 of the casing 1, and an intake port 65 for taking in outside air is formed at the lower end of the supply duct 55.

[0011] Air outlet 66 of supply duct 55 opens rearward toward heating unit 3, and air intake port 47 of heating unit 3 is provided on the front surface of housing 21 and faces air outlet 66 of supply duct 55 from front to rear. Heating unit 3 includes a partition wall 18 that separates heating coil 16 and inverter board 17 from above and below. An air guide piece 74 is provided at the front end of partition wall 18 to guide air sent out from air outlet 66 to air intake port 47, and the front end of air guide piece 74 enters the interior of air outlet 66.

[0012] The inverter board 17 includes a horizontal plate-shaped board body 43 and a heat sink 44 for heat dissipation that is erected on the upper surface of the board body 43. The heat sink 44 is surrounded by an air collection duct 45 that opens at the front and rear ends, and the front end of the air collection duct 45 widens toward an air intake port 47 on the front surface of the housing 21.

[0013] The supply duct 55 is arranged close to one of the left and right sides of the front wall 51 of the casing 1, and an operating section 57 to be operated by the cook is provided on the outer surface of the other of the left and right sides of the front wall 51 of the casing 1. [Effects of the Invention]

[0014] For example, when the cooling mechanism 6 is in contact with the heating unit 3, vibrations and reaction forces generated by the cooling fan 64 are transmitted to the heating unit 3 through the contact points between the two, causing errors in the measurements taken by the weighing unit 4. Furthermore, the same is true when the cooling mechanism 6 is in contact with the weighing unit 4; vibrations and reaction forces generated by the cooling fan 64 are transmitted to the weighing unit 4 through the contact points between the two, causing errors in the measurements taken by the weighing unit 4.

[0015] In contrast to this, in the present invention, when the cooling mechanism 6 is arranged on the inner surface of the casing 1 without contacting the heating and weighing section 7, the vibrations and reaction forces generated by the cooling fan 64 can be prevented from being directly transmitted to the top plate 2, heating unit 3, or weighing unit 4 that constitute the heating and weighing section 7, and the influence of these vibrations and reaction forces on the measured values of the weighing unit 4 can be minimized as much as possible, allowing the weight of the heated object placed on the top plate 2 to be measured more accurately.

[0016] When the casing 1 is not in contact with the heating and weighing section 7, it is possible to prevent vibrations and reaction forces generated by the cooling fan 64 from being transmitted to the heating and weighing section 7 via the casing 1. This further reduces the effect of these vibrations and reaction forces on the measured values of the weighing unit 4, allowing for more accurate measurement of the weight of the object to be heated. In other words, if the cooling mechanism 6 is in contact with the casing 1 and the casing 1 is in contact with the heating and weighing section 7, the vibrations and reaction forces generated by the cooling fan 64 are transmitted to the heating and weighing section 7 via the casing 1, which could result in an error in the measured values of the weighing unit 4. However, when the casing 1 is not in contact with the heating and weighing section 7 as in the present invention, it is possible to prevent the vibrations and reaction forces of the cooling fan 64 from being transmitted to the heating and weighing section 7 via the casing 1, even if the cooling mechanism 6 is in contact with the casing 1, thereby allowing for more accurate measurement of the weight of the object to be heated.

[0017] When the air outlet 66 of the supply duct 55 is located close to and opposite the air intake port 47 of the housing 21 of the heating unit 3, the airflow generated by the cooling fan 64 can be reliably sent into the housing 21, thereby more effectively air-cooling the heating coil 16 and inverter board 17 inside the housing 21.

[0018] If an intake port 65 for taking in outside air is formed at the lower end of supply duct 55, which extends vertically along front wall 51 of housing 1, then intake port 65 can be formed at a position relatively far from top plate 2 or the object to be heated, allowing lower-temperature outside air that is less affected by heating by heating unit 3 to be taken into supply duct 55, and the heating unit 3 can be cooled more efficiently with this outside air. This also prevents steam rising from the object to be heated, smoke containing oil, and the like from being sucked into supply duct 55. Furthermore, if supply duct 55 is formed along front wall 51 of casing 1, dust collection filter 71 covering intake port 65 of supply duct 55 can be more easily accessed, allowing filter 71 to be cleaned or replaced more efficiently.

[0019] An air guide piece 74 is provided contiguous with the front end of the partition wall 18 that separates the heating coil 16 and the inverter board 17 from each other above and below, and when the front end of this air guide piece 74 enters the interior of the air outlet 66, the air guide piece 74 can reliably divide the air blown out from the air outlet 66 above and below the partition wall 18. Therefore, both the heating coil 16 and the inverter board 17, which are located above and below the partition wall 18, can be air-cooled appropriately.

[0020] If the front end of the air collection duct 45 surrounding the heat sink 44 of the inverter board 17 widens toward the air intake port 47 of the housing 21, more of the air blown out from the outlet 66 of the supply duct 55 can be taken into the air collection duct 45, increasing the wind speed within the air collection duct 45, thereby enabling the heat sink 44 within the air collection duct 45 to be air-cooled in a focused and efficient manner.

[0021] By arranging the supply duct 55 close to one of the left and right sides of the front wall 51 of the casing 1 and providing the operating unit 57 on the outer surface of the other of the left and right sides, the internal structures of the supply duct 55 and the operating unit 57 can be arranged side by side on the inner surface of the front wall 51 of the casing 1, thereby making it possible to further reduce the dead space inside the casing 1. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a vertical cross-sectional side view of a main part of an electromagnetic induction heating cooker according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view of an electromagnetic induction heating cooker. [Figure 3] FIG. 1 is a front view of an electromagnetic induction cooking appliance. [Figure 4] FIG. 2 is a front view showing the internal structure of the electromagnetic induction heating cooker. [Figure 5] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] (Embodiment) Figures 1 to 6 show an embodiment of an electromagnetic induction heating cooker (hereinafter referred to as "cooker" where appropriate) according to the present invention. In this embodiment, front, back, left, right, and top and bottom refer to the crossed arrows shown in Figure 2 and the indications of front, back, left, right, and top and bottom written near each arrow. As shown in Figures 2 and 3, the cooker comprises a rectangular frame-shaped casing 1 having an opening on its top surface, and a top plate 2 arranged to close the opening from above, and a cooking vessel P such as a pot containing an object to be heated is placed on the top plate 2.

[0024] As shown in FIG. 4, the interior of casing 1 contains, from top to bottom, a heating unit 3 that heats an object to be heated (an object to be heated contained in cooking container P) placed on top plate 2, a weighing unit 4 that measures the weight of the object to be heated, and a control unit 5 that controls the entire cooker. Also, on the inner surface of casing 1, a cooling mechanism 6 that cools heating unit 3 is disposed (see FIG. 1), and includes a cooling fan 64 (described below) and a feed path 67 that guides air sent out from cooling fan 64 to heating unit 3. Heating unit 3 and weighing unit 4 are each electrically connected to control unit 5 via a power cable (not shown). The top plate 2, heating unit 3, and weighing unit 4 described above constitute a heating and weighing section 7.

[0025] As shown in FIG. 4 , a base frame (base member) 8 is provided below the heating and weighing unit 7 to support the heating and weighing unit 7, cooling mechanism 6, and other components, and a casing 1, which is an exterior panel, is fixed to the base frame 8 on all four sides (front, back, left, and right). The base frame 8 is formed in a C-channel shape with openings on the front, back, and top, and houses a control unit 5 inside. A pair of left and right support frames 10 that support the weighing unit 4 are fixed to the edge of the opening on the top surface of the base frame 8. The weighing unit 4 is composed of a base 11 supported by the support frames 10, a weighing machine 12 mounted on the base 11, and a platform 13 that covers the weighing machine 12 from above, and is located approximately in the center of the casing 1. The platform 13 is formed in the shape of a square box that opens downward and surrounds the weighing machine 12 on all four sides.

[0026] As shown in Figures 1 and 4, the upper part of the casing 1 surrounds the sides of the measuring unit 4 and the heating unit 3 on all four sides. In addition, the casing 1 is not in contact with the heating and measuring section 7, which consists of the top plate 2, the heating unit 3, and the measuring unit 4. The casing 1 is made of a metal such as stainless steel, and prevents leakage of magnetic and electromagnetic waves generated by the heating unit 3.

[0027] As shown in FIG. 1, the measuring unit 4 supports the entire heating unit 3 from below. The heating unit 3 also supports the entire top plate 2 from below. In addition, as described above, the casing 1 is not in contact with the heating and measuring section 7 consisting of the top plate 2, heating unit 3, and measuring unit 4, so the weight of the top plate 2 and other components does not act on the casing 1. Therefore, the measuring unit 4 is acted upon by the weights of the heating unit 3 and top plate 2 and the weight of the object to be heated (including the cooking container P) on the top plate 2. Because the former weight (the weight of the heating unit 3 and top plate 2) is constant, the latter weight, i.e., the weight of the object to be heated, can be measured by subtracting the former weight from the measurement value of the measuring unit 4 in advance.

[0028] As shown in Figure 5, the heating unit 3 is composed of a horizontal, disk-shaped heating coil 16 facing the inner surface of the top plate 2, an inverter board 17 that supplies high-frequency current to the heating coil 16, a partition wall 18 that separates the heating coil 16 and the inverter board 17 from above and below, two temperature sensors 19 and 20 that detect the temperature of the cooking container P through the top plate 2, and a housing 21 that houses these components. The heating coil 16 is placed on the upper surface of the partition wall 18 via a plurality of spacers 22 that are equally spaced around its circumference. When high-frequency current is supplied to the heating coil 16 from the inverter board 17, an induced magnetic field is generated above the top plate 2, causing eddy currents to flow in the cooking container P on the top plate 2. The Joule heat generated by the electrical resistance heats the cooking container P and the food placed therein (i.e., the object to be heated).

[0029] As shown in FIG. 5 , the top plate 2 on which the cooking container P is placed is composed of a rectangular top frame 25, a rectangular glass plate 26, and a shield plate 27 fitted inside the top frame 25. The glass plate 26 and the shield plate 27 are stacked one above the other in the order shown, and the top surfaces of the glass plate 26 and the top frame 25 are approximately flush with each other. A support flange 28 with an L-shaped cross section projects inward from the inner peripheral edge of the top frame 25 to support the glass plate 26 and the shield plate 27. A cover wall 29 extends downward from the outer peripheral edge of the top frame 25, covering the upper end of the casing 1 from the outside. The shield plate 27 is made of a nonmagnetic, conductive material such as aluminum, and has a circular coil opening 30 in its center, allowing the heating coil 16 to face the glass plate 26. The diameter of the coil opening 30 is set slightly larger than the outer diameter of the heating coil 16.

[0030] Of the two temperature sensors 19 and 20 that make up the heating unit 3, the first temperature sensor 19 is a thermistor that is in close contact with the center of the underside of the glass plate 26 of the top plate 2 and detects its temperature, and is supported by a sensor bracket 33 that stands upright from the upper surface of the partition wall 18 toward the center hole of the heating coil 16. The second temperature sensor 20 is a radiation thermometer that detects the temperature of infrared rays radiated from the glass plate 26 and is disposed in a recumbent position on the underside of the partition wall 18. A triangular prism 34 with a 45-degree reflective surface is disposed in front of the second temperature sensor 20, and a detection hole 35 is opened in the center of the partition wall 18 that faces the reflective surface of the prism 34 and the center hole of the heating coil 16. In other words, infrared rays emitted downward from the center of the underside of the glass plate 26 pass through the central hole of the heating coil 16 and the detection hole 35 to reach the prism 34, where they are reflected horizontally by its reflective surface toward the second temperature sensor 20, and their temperature is detected by the second temperature sensor 20.

[0031] As shown in FIG. 5 , the housing 21 of the heating unit 3 is made of a metal such as stainless steel and is formed in the shape of a square box with an opening on the top surface. The housing 21 supports the top plate 2 at its upper end and is supported from below by the weighing unit 4. Specifically, the housing 21 is composed of a center case 38 that forms the left-right center of the housing 21 and a pair of side cases 39 that form both left and right ends. The center case 38 is formed to have the same width as the platform 13 of the weighing unit 4 and is placed on the platform 13, and each side case 39 extends downward along the outer surface of the platform 13 and is joined to the outer surface. A support arm 40 that supports the top frame 25 from below is integrally formed on the upper part of each side case 39.

[0032] As shown in FIG. 5, inverter board 17 is disposed on the bottom surface of center case 38 and is composed of a rectangular board main body 43 that is slightly smaller than the bottom surface, and a heat sink 44 for heat dissipation that is erected on the right half of board main body 43. Heat sink 44 is surrounded from above and to the left and right by air collection ducts 45 that open at the front and rear ends. As shown in FIG. 6, an air intake port 47 that occupies most of the front surface of housing 21 is provided, and an exhaust port 48 that occupies most of the rear surface of housing 21 is also provided. The front end of air collection duct 45 extends to and widens toward air intake port 47 on the front surface of housing 21.

[0033] As shown in FIG. 6 , the casing 1 includes a front wall 51 and a rear wall 52 that face each other from front to back with the heating unit 3, the measuring unit 4, and the like sandwiched between them, and a pair of left and right side walls 53, 53 that connect the side edges of the front wall 51 and the rear wall 52. A supply duct 55 that blows air rearward toward the air intake port 47 is formed on the inner surface of the front wall 51. The air blown out from the supply duct 55 flows within the housing 21 of the heating unit 3 from the front (air intake port 47) to the rear (air exhaust port 48) to cool the heating coil 16, inverter board 17, and other components that generate heat within the housing 21. As described above, the front end of the air collection duct 45 expands toward the air intake port 47, so that a larger amount of air is drawn into the air collection duct 45, and the air velocity within the air collection duct 45 is higher than that outside. This allows for focused and efficient air cooling of the heat sink 44 within the air collection duct 45.

[0034] As shown in FIG. 6, the supply duct 55 is located near the right side of the front wall 51 of the casing 1. As shown in FIG. 2, an operation unit 57 operated by the cook is provided on the outer surface of the left side of the front wall 51. As shown in FIG. 2, the operation unit 57 is composed of a touch panel 58, a rotary dial 59, and a push button 60. A cook standing in front of the casing 1 can adjust the output of the heating coil 16 by operating the operation unit 57. The operation unit 57 is located at the top of the front wall 51, and the top of the operation unit 57 slopes downward toward the front. A transparent, rectangular operation cover 61 is detachably attached to the top end of the front wall 51 (see FIGS. 1 and 2). The operation cover 61 covers the operation unit 57 from above to protect it from water spilling over from the cooking container P on the top plate 2.

[0035] As shown in Figure 1, supply duct 55 extends in the vertical direction along the inner surface of front wall 51 of casing 1, and houses a cooling fan 64 inside. A supply path 67 is formed in supply duct 55 downstream of cooling fan 64. Cooling fan 64 is made up of a pair of left and right axial fans (see Figure 6), and when these cooling fans 64 are driven, an upward airflow is formed inside supply duct 55. An intake port 65 for taking in outside air is formed at the lower end of supply duct 55, and an outlet port 66 for blowing air toward heating unit 3 is formed at the upper end of supply duct 55.

[0036] As shown in FIG. 1, the intake port 65 opens downward and faces from above a front vent hole 69 formed in the front wall 51 of the casing 1. The front vent hole 69 is composed of long holes aligned in a row on the left and right sides in the front-to-rear direction (see FIG. 6), and a dust-collecting filter 71 with an integrated handle 70 for insertion and removal is attached between the front vent hole 69 and the intake port 65. The supply duct 55 is bent midway, and extends straight upward from the intake port 65 to the bent portion, but slopes upward and rearward from the bent portion to the outlet 66. The cooling fan 64 is disposed between the intake port 65 and the bent portion.

[0037] The air outlet 66 opens rearward and faces closely to the air inlet 47 of the housing 21 of the heating unit 3 (there is a gap between them). The air blown out from the air outlet 66 flows into the housing 21 from the air inlet 47 and is divided into the upper and lower sides of the partition wall 18. To ensure this division, the front end of the partition wall 18 extends to the air inlet 47, and an air guide piece 74 is provided that is continuous with the front end of the partition wall 18 and extends to the air outlet 66. The air guide piece 74 is inclined downward and forward toward the air outlet 66, and its tip extends slightly into the supply duct 55 (however, it does not touch the wall surface of the supply duct 55). By appropriately adjusting the dimensions and angle of the air guide piece 74, the air blown out from the air outlet 66 can be divided into the upper and lower sides of the partition wall 18 in a desired ratio.

[0038] The air flowing above the partition wall 18 cools the heating coil 16 and the glass plate 26, while the air flowing below the partition wall 18 cools the inverter board 17. As described above, the heat sink 44 of the inverter board 17 is primarily cooled by the action of the air collection duct 45. The air after heat exchange that has cooled the heating coil 16, the inverter board 17, etc. is discharged rearward through the exhaust port 48 on the rear surface of the housing 21. The rear wall 52 of the casing 1 is provided with rear vent holes 76 consisting of a group of vertically elongated holes, and a rear duct 77 that opens at the bottom is formed outside the rear vent holes 76. Therefore, the air after heat exchange that is discharged from the heating unit 3 through the exhaust port 48 is released downward outside the cooker through the rear vent holes 76 and the rear duct 77.

[0039] As described above, in the cooker of this embodiment, the cooling mechanism 6 is not in contact with the heating and measuring section 7, so vibrations generated from the cooling fan 64 when the cooling fan 64 is driven and the reaction force acting on the cooling fan 64 can be prevented from being transmitted to the heating and measuring section 7. Furthermore, in the cooker of this embodiment, the casing 1 is not in contact with the heating and measuring section 7, so the vibrations and reaction force generated from the cooling fan 64 can be prevented from being transmitted to the heating and measuring section 7 via the casing 1. As described above, the influence of the vibrations and reaction force generated by the cooling fan 64 on the measurement value of the measuring unit 4 can be minimized, so the weight of the object to be heated on the top plate 2 can be measured more accurately.

[0040] The air outlet 66 of the supply duct 55 is positioned closely opposite the air intake port 47 of the housing 21 of the heating unit 3, so that the airflow generated by the cooling fan 64 can be reliably sent into the housing 21, thereby more accurately air-cooling the heating coil 16 and inverter board 17 inside the housing 21.

[0041] Intake port 65 for taking in outside air is formed at the lower end of supply duct 55, which extends vertically along front wall 51 of housing 1. Therefore, by forming intake port 65 at a position relatively far from top plate 2 or the object to be heated, it is possible to take in lower temperature outside air, which is less affected by heating by heating unit 3, into supply duct 55 and more efficiently air-cool heating unit 3 using this outside air. It is also possible to prevent steam rising from the object to be heated, smoke containing oil, and the like from being sucked into supply duct 55. Furthermore, because supply duct 55 is formed along front wall 51 of casing 1, it is possible to more easily access dust collection filter 71 covering intake port 65 of supply duct 55, allowing for more efficient cleaning and replacement of filter 71.

[0042] An air guide piece 74 is provided contiguous with the front end of the partition wall 18 that separates the heating coil 16 and the inverter board 17 from above and below, and the front end of this air guide piece 74 is positioned inside the air outlet 66, so that the air guide piece 74 can reliably divide the air blown out from the air outlet 66 above and below the partition wall 18. Therefore, both the heating coil 16 and the inverter board 17, which are located above and below the partition wall 18, can be air-cooled appropriately.

[0043] The front end of the air collection duct 45 surrounding the heat sink 44 of the inverter board 17 is widened toward the air intake port 47 of the housing 21, so that more air blown out from the air outlet 66 of the supply duct 55 can be taken into the air collection duct 45, increasing the air speed inside the air collection duct 45. This allows the heat sink 44 inside the air collection duct 45 to be air-cooled intensively and efficiently.

[0044] The supply duct 55 is arranged close to one of the left and right sides of the front wall 51 of the casing 1, and the operating unit 57 is provided on the outer surface of the other of the left and right sides, so that the internal structures of the supply duct 55 and the operating unit 57 are arranged side by side on the inside surface of the front wall 51 of the casing 1, thereby making it possible to further reduce the dead space inside the casing 1. [Explanation of symbols]

[0045] 1 casing 2 top plate 3 Heating Unit 4 Weighing Unit 6 Cooling mechanism 7 Heating measuring section 8 Base material (base frame) 16 heating coil 17 Inverter board 18 Bulkhead 21. Cabinet 43 Board body 44 Heatsink 45 Air collection duct 47 Air supply port 51 Front wall 55 Supply duct 57 Operation section 64 Cooling fan 65 Intake port 66 Air outlet 67 Air duct 74 Wind guide piece

Claims

1. a heating and measuring section (7) including a top plate (2) on which an object to be heated is placed, a heating unit (3) disposed below the top plate (2) for heating the object to be heated, and a measuring unit (4) disposed below the heating unit (3) for measuring the weight of the object to be heated; a cooling mechanism (6) having a cooling fan (64) and a supply path (67) for guiding air sent out from the cooling fan (64) to the heating unit (3), and for air-cooling the heating unit (3); a base member (8) disposed below the heating and measuring unit (7) and supporting the heating and measuring unit (7) and the cooling mechanism (6); a casing (1) surrounding the heating unit (3) and the measuring unit (4); Equipped with An electromagnetic induction cooking device characterized in that a cooling mechanism (6) is disposed on the inner surface side of a casing (1) in a state where the cooling mechanism (6) is not in contact with a heating and measuring section (7).

2. 2. The electromagnetic induction cooking appliance according to claim 1, wherein the casing (1) is not in contact with the heating and measuring section (7).

3. The heating unit (3) includes a heating coil (16) that generates an induction magnetic field above the top plate (2), an inverter board (17) that supplies a high-frequency current to the heating coil (16), and a housing (21) that houses the heating coil (16) and the inverter board (17). The cooling mechanism (6) includes a supply duct (55) formed along the inner surface of the casing (1), having a supply path (67) and accommodating a cooling fan (64); 2. The electromagnetic induction heating cooker according to claim 1, wherein the air outlet (66) formed at the downstream end of the supply duct (55) is closely opposed to an air intake port (47) opened in the housing (21) of the heating unit (3).

4. The supply duct (55) extends vertically along the front wall (51) of the casing (1), 4. The electromagnetic induction cooking appliance according to claim 3, wherein an intake port (65) for taking in outside air is formed at the lower end of the supply duct (55).

5. The air outlet (66) of the supply duct (55) opens rearward toward the heating unit (3), The air intake port (47) of the heating unit (3) is provided on the front surface of the housing (21) and faces the air outlet (66) of the supply duct (55) in the front-rear direction. The heating unit (3) includes a partition wall (18) that separates the heating coil (16) and the inverter board (17) from each other above and below. An air guide piece (74) is provided at the front end of the partition wall (18) to guide the air sent out from the air outlet (66) to the air intake port (47), 5. The electromagnetic induction cooking appliance according to claim 4, wherein a front end of the air guide piece (74) is inserted into the air outlet (66).

6. The inverter board (17) includes a horizontal plate-shaped board body (43) and a heat sink (44) for heat dissipation erected on the upper surface of the board body (43), The heat sink (44) is surrounded by an air collection duct (45) that opens at the front and rear ends, 6. The electromagnetic induction cooking appliance according to claim 5, wherein a front end of the air collection duct (45) widens toward an air intake port (47) on the front surface of the housing (21).

7. The supply duct (55) is arranged near one of the left and right sides of the front wall (51) of the casing (1), 7. The electromagnetic induction cooking appliance according to claim 4, wherein an operating section (57) to be operated by a cook is provided on the outer surface of the other of the left and right sides of the front wall (51) of the casing (1).

Images