JP2011003451A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker which reduces occurrence of an erroneous operation of a vibration seismoscope due to thermal deformation and/or vibration from a ventilation fan.SOLUTION: This includes: an induction heating coil 26; an electronic circuit board 22 on which electronic circuit parts are arranged which at least control an output from the induction heating coil 26; a circuit board holder 23 to house the electronic circuit board 22; and a seismoscope 21 which detects the vibration, and the seismoscope 21 is installed on the electronic circuit board 22.

Description

  The present invention relates to an induction heating cooker, and more particularly to an arrangement of a seismic device that detects shaking such as an earthquake installed therein.

  The induction heating cooker is a cooker in which a heating coil is disposed below a top plate on which the object to be heated is placed, and a high frequency current is passed through the heating coil to heat the object to be heated by electromagnetic induction.

  The seismoscope is, for example, installed in an electronic device or the like with a steel ball accommodated in the main body in a recess at the bottom by screwing or the like. The shaking is detected by turning off the energization.

  Conventionally, as an induction heating cooker equipped with a seismic sensor, for example, “an inverter circuit that converts an AC power source into a predetermined high-frequency current, a heating coil that receives the output of the inverter circuit and generates a high-frequency magnetic field, In an induction heating apparatus comprising a pan support for supporting a cooking pan heated by a heating coil and a control means for controlling the operation of the inverter circuit, the vibration detection means for detecting vibration applied to the induction heating apparatus is heated. An induction heating apparatus provided in a cooking apparatus, wherein the control means holds the operation of the inverter circuit in a stopped state when the vibration detection means detects a vibration having a magnitude greater than or equal to a predetermined value is proposed. (For example, refer to Patent Document 1).

JP 2002-75621 A (Claim 1, FIG. 1)

  However, in the induction heating cooker of the above-mentioned Patent Document 1, the seismic device is arranged in a recess provided in the lower part of the circuit board holder in which the electronic circuit board is accommodated. This dent is large enough to accommodate a seismic device. Since the lower part of the circuit board holder is exposed to a high-temperature atmosphere, there has been a problem in that the attachment part of the seismoscope to the holder itself is thermally deformed, resulting in malfunction. Moreover, since the blower fan is installed in the vicinity of the lower part of the circuit board holder, there is a problem that a malfunction occurs due to vibration of the blower fan.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an induction heating cooker that suppresses the occurrence of malfunction of a seismic device due to thermal deformation or vibration of a blower fan. To do.

  An induction heating cooker according to the present invention includes a heating means, an electronic circuit board on which electronic circuit components that at least control the heating means are arranged, a holder that houses the electronic circuit board, and a seismic detector that detects vibration. The seismic device is provided on the electronic circuit board.

  In the present invention, by providing the seismic device on the electronic circuit board, there is no possibility that the mounting portion of the seismic device is inclined due to thermal deformation of the circuit board holder, and further, the distance from the blower fan to the seismic device is increased. Therefore, the malfunction of the seismic device due to thermal deformation or vibration of the blower fan can be suppressed.

It is a perspective view of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is an upper exploded view of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. (a) It is a perspective view of the fan case which concerns on Embodiment 1 of this invention. (b) It is sectional drawing of the ventilation fan which concerns on Embodiment 1 of this invention. (c) It is a top view of the fan case which concerns on Embodiment 1 of this invention. (a) It is a schematic sectional drawing of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. (b) It is a schematic sectional drawing of the conventional induction heating cooking appliance. It is an example of sectional drawing of the seismic device mounted in the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is an upper exploded view of the conventional induction heating cooker.

Embodiment 1 FIG.
FIG. 1 is a perspective view of induction heating cooker 10 according to Embodiment 1 of the present invention. FIG. 2 is an upper exploded view of induction heating cooker 10 according to Embodiment 1 of the present invention.
1 includes a main body case 11, a top plate 12, a first pan position display unit 13, a second pan position display unit 14, a vent hole 15, a grill unit 16, and an operation unit. 17. As shown in FIG. 2, the induction heating cooker 10 includes an induction heating coil 26, a radiant heater unit 27, and a blower fan 24.

  A top plate 12 on which an object to be heated is placed is provided on the upper surface of the main body case 11. The top plate 12 is provided with a cooking utensil when cooking using a first pan position indicator 13 serving as a mark for placing the cooking utensil when cooking by induction heating and a pan that cannot be used with induction heating. The 2nd pan position display part 14 used as the mark to mount is provided.

  An induction heating coil 26 is provided below the first pan position display unit 13, and a radiant heater unit 27 is provided below the second pan position display unit 14. The pan placed on the first pan position display unit 13 is generally made of a metal material such as iron, and an alternating magnetic field formed around the coil in response to energization of the induction heating coil 26 according to an instruction from the operation unit 17. It will be put in the state. As a result, due to the action of eddy current flowing inside the pan, the entire pan serves as a heating source, and the object to be heated contained in the pan is heated.

  In FIG. 2, a grill portion 16 is provided below the top plate 12. The front surface of the grill portion 16 is flush with the front side surface of the main body case 11. The front opening of the grill portion 16 is covered with a door so as to be opened and closed, and the door is held by a support mechanism of the grill portion 16 so as to be movable in the front-rear direction. A window plate made of heat-resistant glass is installed in the central opening of the door so that the inside of the grill 16 can be seen. The door opening / closing operation is performed by pulling out or pushing in a handle protruding forward.

  In the operation unit 17, it is possible to input or check energization states (heating power, time, etc.) of the grill unit 16, the left and right dielectric heating coils 26, and the heater of the radiant heater unit 27. The operation unit 17 includes a main power switch for turning on / off all the power sources of the heating source at once, a left operation dial for setting the energization of the left heating port and the energization amount (thermal power), and energizing the right heating port. A right operation dial for setting an energization amount (thermal power).

3A is a perspective view of the blower fan 24 according to Embodiment 1 of the present invention, FIG. 3B is a cross-sectional view of the blower fan 24, and FIG. 3C is a top view of the blower fan 24. .
The fan case 28 constituting the blower fan 24 includes a blower inside. The fan case 28 is formed with a blower chamber so as to surround the wing portion 29 of the blower, and an air suction port 25 is formed at the upper end of the blower chamber. As the blower, a centrifugal multi-blade blower (typically, there is a sirocco fan) is used, and a blade having a blade 29 fixed to the tip of the rotating shaft of the drive motor is used.

  FIG. 4 (a) is a schematic cross-sectional view of induction heating cooker 10 according to Embodiment 1 of the present invention. This is a diagram roughly showing the positional relationship between the seismic device 21, the induction heating coil 26, the blower fan 24, and the grill portion 16. In FIG. 4A, details of other components are omitted. FIG. 4B is a schematic cross-sectional view of a conventional induction heating cooker 10.

  The heating coil unit provided below the first pan position display unit 13 includes an induction heating coil 26 and a heating coil holding unit 26a. The induction heating coil 26 is formed by winding a bundle of about 30 thin wires of about 0.1 mm in a spiral shape and winding one or more bundles (hereinafter referred to as “collection wires”) so that the outer shape becomes circular. Finally, it is formed into a disk shape.

  In the first embodiment, a double induction heating coil 26 having an inner heating coil in which a collecting wire is formed into a disk shape and an outer heating coil provided concentrically at intervals outside the inner heating coil is employed. is doing. The heating coil holding part 26 a is a member that holds the induction heating coil 26, and has a substantially circular shape with a slightly larger diameter than the induction heating coil 26.

  Next, in FIG. 4, the induction heating cooker 10 is provided with a blower fan 24 and an air suction port 25 for cooling a portion that becomes hot during heating. A blower fan 24 is provided between the air intake port 25 and the induction heating coil 26, and the air intake side of the blower fan 24 communicates with the air intake port 25 and the ventilating port 15 (see FIG. 2) for exhaust. The side passes through heat generating elements such as the grill portion 16 and communicates with exhaust holes (not shown).

  A circuit board holder 23 in which the electronic circuit board 22 is accommodated is installed above the blower fan 24. On the electronic circuit board 22, an electronic circuit component for controlling the dielectric heating cooker 10 is provided. In the first embodiment, as shown in FIG. 4A, the seismic device 21 is adjacent to the component group. Is provided. The seismoscope 21 functions as a safety device that detects vibrations such as earthquakes, and stops the supply of power to the induction heating coil 26 and the like when detecting a shake greater than a predetermined magnitude during cooking.

  In the first embodiment, by providing the seismic device 21 on the electronic circuit board 22, the distance between the seismic device 21 and the blower fan 24 can be increased, the influence of vibration by the blower fan 24, and the high temperature atmosphere. It is possible to suppress thermal deformation of the mounting portion of the seismic device 21 due to the above.

  As described above, conventionally, the seismic device 21 mounted on the induction heating cooker 10 is provided below the circuit board holder 23 that accommodates the electronic circuit board 22 as shown in FIGS. 4B and 6. It was placed in the dent. The dent was large enough to be accommodated by the seismic device 21 and was adjacent to the blower fan 24 located below the circuit board holder 23.

  However, in the first embodiment of the present invention, by providing the seismic device 21 on the electronic circuit board 22, it is not necessary to provide a recess for housing the seismic device 21 below the circuit board holder 23, and the circuit board holder The effect of simplifying the shape of 23 was also obtained.

Next, the outline | summary of operation | movement of the induction heating cooking appliance 10 which has said structure is demonstrated.
When the power is turned on by the main power switch of the operation unit 17 and the heating conditions such as the heating power level and the heating time are set by the operation dial or the like, these pieces of information are input to the energization control circuit of the electronic circuit board 22 and induced heating. A drive voltage is applied to a drive circuit that drives the coil 26. As a result, a high-frequency current flows through the induction heating coil 26, and a heated object such as a pan placed on the first pan position display unit 13 is heated by the high-frequency magnetic flux from the induction heating coil 26.

  As described above, when the heating by the induction heating coil 26 is performed, the blower fan 24 is driven. When the blower fan 24 is driven, air is sucked from the air suction port 25 of the fan case 28 by rotating the blade portion 29 at a high speed inside the fan case 28. The sucked air cools the heat generating elements such as the electronic parts on the electronic circuit board 22 that controls the driving of the grill portion 16 and the induction heating cooker 10, and exhaust holes (see FIG. It is discharged from (not shown).

FIG. 5 is an example of a cross-sectional view of the seismic device 21 mounted on the induction heating cooker according to Embodiment 1 of the present invention.
The seismic sensor 21 includes a base member 30, a mounting portion 30 a, a cover member 31, a steel ball seat portion 32, a switch portion 33, one terminal portion 34, the other terminal portion 35, and a contact 36. The movable piece 37, the lever 38, the plunger 39, and the steel ball 40 are provided.

  The seismic device 21 is installed in the electronic circuit board 22 and the circuit board holder 23 shown in FIG. 2 by attaching screws to the mounting part 30a while the steel ball 40 housed in the main body is housed in the steel ball seat part 32. Fixed.

Next, the mechanism of the switch switching operation in the seismic device 21 will be described.
When the seismic device 21 is placed in a horizontal position, the steel ball 40 is correctly received and placed on the steel ball seat 32 as shown in FIG. 2, and the plunger 39 in contact with the tip of the lever 38 is pushed by the weight of the steel ball 40. It is. In this state, the lever 38 is urged downward, and the intermediate portion of the movable piece 37 is in contact with the contact 36 of the other terminal portion 35.

When the seismoscope installed as described above receives vibration, the steel ball 40 rolls and disengages from the steel ball seat 32, the pressing of the plunger 39 is released, and the lever 38 is displaced upward to move. The piece 37 is displaced upward. Then, the movable piece 37 is separated from the contact point 36 of the other terminal portion 35 and the energization is interrupted.
Note that the seismic device 21 used in the first embodiment is not limited to the cross-sectional structure shown in FIG.

  In Embodiment 1 which concerns on this invention, the seismic device 21 mounted in the induction heating cooking appliance 10 is installed on the electronic circuit board 22. FIG. The seismic device 21 is fixed to the electronic circuit board 22 and the circuit board holder 23 by attaching screws to the mounting portion 30a shown in FIG.

The lower periphery of the circuit board holder 23 becomes a high temperature atmosphere of about 100 ° C. due to heat generated by the grill portion 16 and the like. Since the amount of air flowing into the upper part of the electronic circuit board 22 is small, the temperature on the electronic circuit board 22 is lower than the temperature around the lower part of the circuit board holder 23. Moreover, since the electronic circuit board 22 has heat resistance, even if the seismic device 21 is installed, thermal deformation in the mounting portion hardly occurs.
Furthermore, since the positions of the seismic device 21 and the blower fan 24 are separated from each other, it is possible to suppress malfunctions that the seismic device 21 detects vibrations from the blower fan 24.

Therefore, by installing the seismic device 21 on the electronic circuit board 22, the effects listed below can be obtained.
(1) There is no possibility that the mounting portion is inclined due to thermal deformation of the circuit board holder 23, and malfunction of the seismic device 21 can be suppressed.
(2) The distance from the blower fan 24 to the seismic device 21 can be increased, and the influence of vibration by the blower fan 24 is greatly reduced. Also, the electronic circuit board 22 itself has an effect of absorbing vibration.
(3) Conventionally, a long wiring for supplying power to the seismic device 21 was required. However, by adopting the structure shown in FIG. 2, the wiring length to the seismic device 21 can be shortened. It was.
(4) Since the circuit board holder 23 does not need a dent at the bottom and the shape itself is simplified, the manufacturing cost of the circuit board holder 23 can be reduced.
(5) Since the electronic circuit board 22 can be fastened together with a screw between the seismic device 21 and the circuit board holder 23, a screw for fixing the electronic circuit board 22 and the circuit board holder 23 used in the past is used. Is no longer necessary, leading to a reduction in raw material costs.

  DESCRIPTION OF SYMBOLS 10 Induction cooking device, 11 Main body case, 12 Top plate, 13 1st pan position display part, 14 2nd pan position display part, 15 Ventilation opening, 16 Grill part, 17 Operation part, 20 Cover, 21 22 electronic circuit board, 23 circuit board holder, 24 blower fan, 25 air inlet, 26 induction heating coil, 26a heating coil holding part, 27 radial heater part, 28 fan case, 29 wing part, 30 base member, 30a mounting part , 31 cover member, 32 steel ball seat part, 33 switch part, 34 one terminal part, 35 other terminal part, 36 contact point, 37 movable piece, 38 lever, 39 plunger, 40 steel ball.

Claims (2)

Heating means;
An electronic circuit board on which electronic circuit components for controlling at least the heating means are disposed;
A holder for accommodating the electronic circuit board;
Equipped with a seismoscope to detect vibration,
An induction heating cooker, wherein the seismic device is provided on the electronic circuit board. The induction heating cooker according to claim 1, wherein the seismic device and the holder are fixed with the electronic circuit board interposed therebetween.

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