JP2014135119A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a temperature of an infrared sensor and maintain detection accuracy of the infrared sensor thereby to accurately detect a temperature.SOLUTION: An induction heating cooker comprises: a first cooling duct 54 which has a top face and lateral faces and is arranged on the outside of a heat sink 64, for cooling the heat sink 64 by cooling air; and a second cooling duct 57 which is formed on the top face of the first cooling duct 54 and includes a second exhaust part 59 arranged near an infrared sensor unit 53 and a second suction part 58 arranged on the windward side of the second exhaust part 59 with respect to a cooling fan 60, in which a part of the cooling air flows in from the second suction part 58 and is exhausted from the exhaust part 59 in a manner of being separated from the cooling air which passes through the first cooling duct 54 and the cooling air blown out from the second suction part 58 blows at the infrared sensor unit 53.

Description

  The present invention relates to an induction heating cooker provided with an infrared sensor.

Conventionally, this type of induction heating cooker is provided on the upper surface of the main body 21, a top plate 23 on which the cooking container 22 is placed, a heating coil 24 that is provided on the lower part of the top plate 23 and heats the cooking container 22, and a top An infrared sensor 26 that is provided below the plate 23 and detects infrared rays emitted from the cooking vessel 22, a control circuit 27 that controls the output of the heating coil 24 according to the output of the infrared sensor 26, and a magnetic flux from the heating coil 24 There is a magnetic shield plate 28 that suppresses leakage and supports the heating coil 24 from below, and an infrared sensor 26 and a control circuit 27 are arranged below the magnetic shield plate 28.

  FIG. 6 is a main cross-sectional view of a conventional induction heating cooker.

JP 2009-289424 A

  However, in the conventional configuration, since the infrared sensor 26 is cooled by the cooling air heated by the heat generating component of the control circuit or the magnetic shield, the temperature of the infrared sensor 26 rises, and the detection accuracy of the infrared sensor in the temperature region is maintained. It had the problem that it was difficult.

  The present invention solves the above-described conventional problems, and reduces the temperature of the infrared sensor, maintains the infrared detection accuracy without heating the cooling air by the heat-generating component of the control circuit or the magnetic shield, and maintains the accurate temperature. It aims at providing the induction heating cooking appliance which can detect.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention is provided on the upper surface of a main body, and a top plate on which a cooking container is placed, and heating that is provided below the top plate and heats the cooking container. A high frequency current is supplied to the heating coil, including a coil, an infrared sensor unit that is provided below the top plate and has an infrared sensor that detects infrared rays that have passed through the top plate radiated from the cooking container, and a switching element An inverter that drives the switching element and adjusts a 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 an outlet A cooling fan for blowing cooling air from the heat sink, and A first cooling duct configured to cool the heat sink by the cooling air disposed outside the first cooling duct, and the first cooling duct opposed to the outlet provided at a front end of the first cooling duct. A first air intake unit that takes in the cooling air; and a first air exhaust unit that exhausts the cooling air taken in from the first air intake unit provided at a rear end of the first cooling duct, A second cooling duct is formed on the upper surface of the first cooling duct, and the second cooling duct is provided on the wind with respect to the cooling fan more than the second exhaust part and the second exhaust part. A part of the cooling air flows from the second air intake part, flows separately from the cooling air passing through the first cooling duct, and flows from the second exhaust part. And the second exhaust part is red. Provided in the vicinity of the line sensor unit, wherein the cooling air blown out from the second suction unit is obtained by a structure falling on the infrared sensor unit.

  Thereby, the temperature effect of the heat sink can be reduced with respect to the infrared sensor, the temperature of the infrared sensor is reduced, the infrared detection accuracy is maintained, and accurate temperature detection is possible. Even if the heat sink and the infrared sensor are installed close to each other, the infrared sensor can be kept at a low temperature, so that the degree of freedom in installing the infrared sensor can be increased.

The induction heating cooker of the present invention can realize an improvement in the degree of freedom of installation of the infrared sensor and accurate temperature detection.

Main sectional view showing detailed structure and flow of wind near infrared sensor of induction heating cooker in embodiment 1 of the present invention The front view of the principal part of the infrared heating sensor vicinity of the induction heating cooking appliance in Embodiment 1 of this invention The perspective view of the part of the vicinity of the infrared sensor of the induction heating cooker in Embodiment 1 of this invention. The perspective view of the 1st cooling duct 54 in Embodiment 1 of this invention The perspective view of the 1st cooling duct 54 in Embodiment 1 of this invention Main sectional view of induction heating cooker in the conventional example

  1st invention is provided in the upper surface of a main body, the top plate which mounts a cooking container, the heating coil which is provided under the top plate and heats the cooking container, and is provided under the top plate and the above-mentioned An infrared sensor unit having an infrared sensor that detects infrared rays that have passed through the top plate radiated from a cooking container, an inverter that includes a switching element and supplies a high-frequency current to the heating coil, and drives the switching element and the infrared ray A control circuit that adjusts the control heating power according to the output of the sensor, a heat sink that fixes and cools the switching element disposed below the heating coil, a cooling fan that blows cooling air from the outlet, and an upper surface and a side surface Having the heat by the cooling air disposed outside the heat sink A first cooling duct configured to cool the tank, and a first air intake section that takes the cooling air into the first cooling duct that opposes the air outlet provided at the front end of the first cooling duct And a first exhaust part for exhausting the cooling air taken in from the first intake part provided at the rear end of the first cooling duct, and a second exhaust part on the upper surface of the first cooling duct. A cooling duct is formed, and the second cooling duct has a second exhaust part and a second intake part provided on the windward side with respect to the cooling fan than the second exhaust part, A part of the cooling air flows from the second air intake part, flows separately from the cooling air passing through the first cooling duct, flows out from the second exhaust part, and is discharged from the second exhaust part. Is provided in the vicinity of the infrared sensor unit, and the second Since the cooling air blown out from the intake portion is configured to hit the infrared sensor unit, the cooling air can be guided to the infrared sensor without heating the cooling air by a heat generating component such as a switching element of the control circuit. This improves the cooling efficiency of the infrared sensor and enables accurate temperature detection.

In particular, the second invention includes a magnetic shielding plate that shields a leakage magnetic field of the heating coil between the lower surface of the heating coil of the first invention and the upper surfaces of the first and second cooling ducts. By arranging a part or all of the infrared sensor unit below, it is possible to suppress the influence of ambient light from above the top plate, and to cool the infrared sensor without heating the cooling air due to the heat generated by the magnetic shield. Since wind can be guided, the cooling efficiency of the infrared sensor can be improved and accurate temperature detection can be performed.

  In particular, the third invention uses a sirocco fan as the cooling fan of the first or second invention, and arranges the inlet of the second cooling duct in the vicinity of the outer periphery of the outlet of the cooling fan. Since the cooling air in the portion having a particularly high flow velocity can be used, the infrared sensor can be more effectively cooled.

  In the fourth aspect of the invention, in particular, a step part having a partially reduced height is formed on the upper surface of the first cooling duct of any one of the first to third aspects, and the second cooling duct is formed in the step part. In addition, by arranging a part of the heat sink below the stepped portion, the heat sink volume and surface area can be maximized, and the cooling efficiency of the switching element is improved. An infrared sensor can be arrange | positioned on a heat sink and the arrangement | positioning freedom degree can be raised.

  In the fifth invention, in particular, the first cooling duct of any one of the first to fourth inventions is molded from a resin, a hinge is formed in the first cooling duct, and the hinge is bent by the hinge. Since the two cooling ducts are configured, the first cooling duct and the second cooling duct can be configured by one component, so that the mold cost can be reduced and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a main cross-sectional view showing a detailed configuration and wind flow in the vicinity of an infrared sensor of an induction heating cooker according to Embodiment 1 of the present invention.

  In FIG. 1, a top plate 23 on which a cooking container 22 is placed is provided on the upper surface of a main body 21 that forms an outer shell, and a heating coil 24 that induction-heats the cooking container 22 is provided below the top plate 23. In addition, a magnetic shield plate 28 that suppresses magnetic flux leakage of the heating coil 24 is provided below the heating coil 24, and a control circuit 27 including an inverter 51 that supplies a high-frequency current to the heating coil 24 is provided on the magnetic shield plate 28. It is provided below.

  The heating coil 24 and the magnetic shield plate 28 are provided with infrared transmission holes 52, and the infrared sensor 26 is provided below the top plate 23 corresponding to the lower part of the cooking container 22. The infrared rays transmitted through the top plate 23 radiated from the bottom surface are detected and a signal corresponding to the temperature is output. Infrared sensor 26 is surrounded and fixed by a casing made of metal such as aluminum in order to reduce the influence of magnetic flux from heating coil 24, and forms infrared sensor unit 53. The infrared sensor unit 53 is insulated from the magnetic shield plate 28 by providing an insulation distance with the magnetic shield plate 28, thereby reducing the influence of the magnetic field of the coil and increasing the temperature of the magnetic shield plate 28, thereby reducing the thermal effect. .

  The heating coil 24 is fixed on a coil base 29 made of an insulating material such as resin with an adhesive or the like, and the coil base 29 is fixed on the magnetic shield plate 28 by screws or the like. Although the heating coil 24 is made of a metal wire having a low resistance such as copper or aluminum, Joule heat is generated by the amount of resistance in order to supply a high-frequency current from the inverter 51 when the cooking vessel 22 is inductively heated. The temperature rises. The magnetic shield plate 28 is also heated by induction to a great extent, and generates heat and rises in temperature due to heat conduction from the heating coil 24 via the coil base 29.

The cooling fan 60 installed on the lower surface of the main body 21 takes in air from the air inlet 61 and blows cooling air from the air outlet 62 mainly to the inverter 51 on the control circuit 27. The inverter 51 is provided with a heat sink 64 that fixes and cools the switching element 63. The first cooling duct 54 disposed outside the heat sink 64 is configured in parallel to surround the heat sink 64. The first cooling duct 54 is provided with a first air intake portion at a position facing the outlet 62, and takes in the cooling air and induces the air to the heat sink 64. The cooling air is exhausted from one exhaust part 56. A second cooling duct 57 is formed on the upper surface of the first cooling duct 54 to cool the infrared sensor 26. The second cooling duct 57 has a second exhaust part 59 at the rear end and a second intake part 58 provided on the windward side of the cooling fan 60 than the second exhaust part 59, A part of the cooling air flows from the second intake portion 58 and flows separately from the cooling air passing through the first cooling duct 54, and is discharged from the second exhaust portion 59, while being discharged from the second exhaust portion 59. Is provided in the vicinity of the infrared sensor unit 53, and the cooling air blown out from the second exhaust part 59 hits the infrared sensor unit 53.

  FIG. 2 is a front view of the main part in the vicinity of the infrared sensor of the induction heating cooker according to Embodiment 1 of the present invention.

  In FIG. 2, the magnetic shield plate 28 is installed substantially parallel to the top plate 23, and the first cooling duct 54 is installed close to the magnetic shield plate 28 so as to be parallel to the lower side. A heat sink 64 is disposed along the lower surface of the first cooling duct 54. A step portion 65 having a partially reduced height is formed on the upper surface of the first cooling duct 54, and a second cooling duct 57 is formed outside the step portion 65 of the first cooling duct 54. Since the upper surface of the second cooling duct 57 has the same height as the upper surface of the first cooling duct 54, space saving in the height direction can be achieved.

  Further, by disposing a part of the heat sink 64 below the step portion 65, the volume and surface area of the heat sink 64 can be maximized, the cooling efficiency of the switching element 63 can be improved, and the infrared sensor. The unit 53 can also be arranged on the heat sink 64 to increase the degree of freedom of arrangement.

  FIG. 3 is a perspective view of a portion near the infrared sensor of the induction heating cooker according to Embodiment 1 of the present invention.

  In FIG. 3, a sirocco fan is used as the cooling fan 60, and since it has the characteristics of being thin, high-pressure, and high air volume, it is optimal for an induction heating cooker that is thin in the height direction with high pressure loss. Since the air inlet 61 of the cooling fan 60 is disposed on the lower surface of the main body 21, the air volume at the upper part of the air outlet 62 is increased by the law of inertia. Therefore, the upper right portion in FIG. 3 shows the highest air flow and the cooling efficiency is high. A second intake portion 58 of the second cooling duct 57 is provided in the upper right portion in the drawing near the outer periphery of the blowout port 62, and the cooling air is guided to the infrared sensor unit 53 to cool the infrared sensor 26. In addition to improving the efficiency, the infrared sensor unit 53 can be cooled even if the cross-sectional area of the flow path of the second cooling duct 57 is reduced. Therefore, the volume and surface area of the heat sink 64 are increased and the cooling efficiency of the switching element 63 is improved. be able to.

FIG. 4 is a perspective view of first cooling duct 54 according to Embodiment 1 of the present invention.
FIG. 5 is a perspective view of first cooling duct 54 according to Embodiment 1 of the present invention.

In FIG. 4, the first cooling duct is molded from resin, and a hinge 66 is formed in the first cooling duct 54, and the hinge 66 is bent to constitute the second cooling duct 57 in FIG. Thereby, the 1st cooling duct 54 and the 2nd cooling duct 57 can be comprised by one component, and can reduce a cost.

  As described above, the induction heating cooker according to the present invention can improve the degree of freedom of installation of the infrared sensor and realize accurate temperature detection. Therefore, induction heating cooking for home use or business use including the infrared sensor is possible. It can be used for purposes such as vessels.

DESCRIPTION OF SYMBOLS 21 Main body 22 Cooking container 23 Top plate 24 Heating coil 26 Infrared sensor 27 Control circuit 28 Magnetic-shield board 29 Coil base 51 Inverter 52 Hole 53 Infrared sensor unit 54 1st cooling duct 55 1st air intake part 56 1st exhaust part 57 Second cooling duct 58 Second air intake part 59 Second exhaust part 60 Cooling fan 61 Air inlet 62 Air outlet 63 Switching element 64 Heat sink 65 Step part 66 Hinge

Claims (5)

A top plate provided on the upper surface of the main body for placing the cooking container, a heating coil provided below the top plate for heating the cooking container, and provided below the top plate and radiated from the cooking container. An infrared sensor unit having an infrared sensor that detects infrared light that has passed through the top plate, an inverter that includes a switching element and that supplies a high-frequency current to the heating coil, and drives the switching element and according to the output of the infrared sensor A control circuit that adjusts the control heating power; a heat sink that fixes and cools the switching element disposed below the heating coil; a cooling fan that blows cooling air from a blowout port; The heat sink is cooled by the cooling air disposed in A first cooling duct configured as described above, a first air intake section that takes the cooling air into the first cooling duct that faces the outlet provided at a front end of the first cooling duct, and And a first exhaust part for exhausting the cooling air taken in from the first intake part provided at the rear end of the first cooling duct, and a second cooling duct is provided on the upper surface of the first cooling duct. And the second cooling duct has a second exhaust part and a second air intake part that is provided on the windward side of the cooling fan than the second exhaust part, A part of the air flows from the second air intake part, flows separately from the cooling air passing through the first cooling duct, flows out from the second exhaust part, and the second exhaust part is connected to the infrared sensor. Provided in the vicinity of the unit and blowing from the second intake section. Issued said cooling air induction cooking device has a configuration which corresponds to the infrared sensor unit. Between the lower surface of the heating coil and the upper surfaces of the first and second cooling ducts, there is provided a magnetic shield for shielding the leakage magnetic field of the heating coil, and a part or all of the infrared sensor unit is disposed below the magnetic shield. The induction heating cooker according to claim 1. The induction heating cooker according to claim 1 or 2, wherein a sirocco fan is used as a cooling fan, and an inlet of the second cooling duct is arranged in the vicinity of the outer periphery of the outlet of the cooling fan. A step portion having a partially reduced height is formed on the upper surface of the first cooling duct, a second cooling duct is formed on the step portion, and a part of the heat sink is disposed below the step portion. The induction heating cooking appliance of any one of Claims 1-3. The first cooling duct is molded from resin, a hinge is formed on the first cooling duct, and the second cooling duct is formed by bending the hinge with the hinge. Induction heating cooker.

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