JP2009123658A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker with heating coils arranged on the upper face of a cooling duct, using the cooling duct for suppressing the leakage of lines of magnetic force from the heating coils. <P>SOLUTION: The heating cooker comprises the heating coils 21, 22 arranged under a top plate 2 for induction heating a cooking vessel such as a pan placed on the top plate 2, and a cooling means for cooling the heating coils 21, 22 with air blown from a fan unit 12. The cooling means has the cooling duct 16 for guiding cooling air from the fan unit 12 to the lower faces of the heating coils 21, 22. The cooling duct 16 is formed of a non-magnetic conductive material. The upper face of the cooling duct 16 has a surface area large enough to continuously encircle the heating coils 21, 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heating cooker provided with a cooling means for blowing and cooling a heating coil provided for induction heating of a cooking container placed on a top plate.

  In this type of cooking device, an induction heating coil as a heating means is provided in a box-shaped case body, and a cooking container such as a pan is placed on the top plate that is mounted so as to cover the upper surface thereof and heated. It is said. However, since the drive means for driving the heating coil includes an inverter circuit composed of a heat-generating switching element, the heat-generating electronic components are blown and cooled together with the heating coil that generates a large amount of heat. So that cooking can be performed.

  Among the above, the cooling means for the heating coil is particularly provided with a cooling duct for guiding the air from the blower fan, that is, the cooling air to the vicinity of the heating coil in order to efficiently cool the heating coil. For example, the cooling duct is arranged so as to be spaced below the heating coil, and the cooling air is blown out from a plurality of blowing holes provided on the upper surface of the cooling duct (see, for example, Patent Document 1).

On the other hand, in this kind of cooking device, in order to prevent leakage of magnetic lines of force from the heating coil, an aluminum magnetic shielding member is provided on the outer periphery of the heating coil (see, for example, Patent Document 2). Such leakage of magnetic field lines is likely to leak into the air, for example, when the magnetic field lines are not effectively absorbed by the pan, such as when the pan is displaced with respect to the heating coil. Therefore, for example, as a measure for preventing leakage of magnetic field lines due to the position shift of the pan, an extension portion extending downward is provided on the outer peripheral portion of the pan so that the extension portion can be locked to the top plate (top plate). Therefore, it is possible to prevent the displacement and to maintain the leakage of the magnetic lines of force at a certain level (see, for example, Patent Document 3).
Japanese Patent Laying-Open No. 2005-353457 (pages 3, 4 and FIG. 2) Japanese Patent Laying-Open No. 2005-83639 (5th page, FIG. 3) Japanese Examined Patent Publication No. 7-11983 (Page 2, Fig. 1)

  As disclosed in Patent Document 1 and Patent Documents 2 and 3, improvement of the cooling effect of the former heating coil and measures against leakage of magnetic lines of force from the latter heating coil are performed by stable cooking such as noise reduction. Above, it is an indispensable problem in this kind of cooking device. In addition, this kind of cooking device is required to be thin and compact. For example, in a built-in type incorporated in a kitchen or the like, it is desirable to make it as thin as possible in order to effectively use the space below it. In addition, a configuration in which the height is easy to operate even with a stationary type is desirable. However, the cooling means described in the above-mentioned patent document cannot be said to be thin enough, and the magnetic field leakage prevention means is limited to a specific pan structure or a magnetic shielding member, and has some problems. Yes.

  In addition, this type of cooking device often has a built-in grill unit capable of cooking grilled fish and the like, and in particular, there is a growing need for an increase in the size of this grill unit. (Approximately 26 cm), the size of the sword fish is increasing to the extent that it can be burned to five at once. For this reason, the range which a grill unit occupies becomes large, and the space area | region which arrange | positions a heating coil, a cooling means, etc. tends to become still narrower. Therefore, it is necessary to further simplify the configuration and promote a reduction in thickness on the basic condition that leakage of magnetic field lines can be sufficiently prevented without causing a decrease in cooling effect.

  In order to solve the above-mentioned problems, the main object of the present invention is to effectively prevent leakage of magnetic lines of force by using a cooling duct having a heating coil disposed on the upper surface, and further, it is thin with a simple structure. An object of the present invention is to provide a cooking device that can be easily used and can be expected to have a good cooling effect.

The heating cooker of the present invention includes a main body of the heating cooker, a top plate that is provided so as to cover the upper surface of the main body and on which a cooking container such as a pan is placed, and is disposed under the top plate in the main body. And a heating coil for induction heating the cooking container, and a cooling means for cooling the heating coil by blowing air from a fan unit.
The cooling means includes a cooling duct that guides cooling air from the fan unit to the lower surface of the heating coil,
The cooling duct is formed of a nonmagnetic conductive material, and the upper surface of the cooling duct has a surface area large enough to continuously surround the heating coil. 1 invention).

  According to the above means, the magnetic field lines leaking from the heating coil into the air can be absorbed by using the cooling duct made of a nonmagnetic conductive material with the upper surface connected to the periphery thereof, so that stable performance can be maintained, and noise, radio interference, etc. Can be reduced. In addition, since it is not necessary to separately arrange a dedicated magnetic-shielding member around the heating coil, it is effective for reducing the number of parts and the number of assembly steps, simplifying the configuration, etc., and is convenient for thinning with high convenience. .

(First embodiment)
Hereinafter, it demonstrates with reference to FIG. 1 thru | or 6 which shows 1st Example of the heating cooker of this invention.
First, based on the exploded perspective view shown in FIG. 1, the longitudinal side view shown in FIG. 2, and the longitudinal front view shown in FIG. 3, the overall configuration of the heating cooker will be described. It comprises a main body 1 containing a heating means, a cooling means, etc., which will be described later, and a top plate 2 mounted so as to close the upper surface of the main body 1. Among them, the top plate 2 is made of transparent heat-resistant tempered glass and is opaque, and a circular frame line suitable for placing and heating a cooking container (not shown) such as a pan in the central part thereof, For example, the heating parts 3 and 4 printed and displayed at two places are formed. Further, the periphery is covered with a metallic frame portion, and provided with an intake port 5 and an exhaust port 6 for the outside air that serves as cooling air of the cooling means, and a heating power setting display unit 7 is provided in the front.

  On the other hand, the main body 1 is roughly divided into a case 8 that forms a rectangular box-shaped outer shell and has three regions of an electrical component unit 9, an induction heating unit 10, and a grill unit 11. Among them, the electrical component unit 9 includes a fan unit 12 that constitutes a cooling means, particularly as shown in FIG. 2, and includes an electronic unit 13 and an operation unit 14 mainly for cooking setting on the front side. Yes.

  The fan unit 12 includes a blower fan 12a and a fan case 12b driven by a motor (not shown), and the electronic unit 13 is distributed in, for example, two upper and lower layers, and an inverter such as an IGBT is provided in the upper layer portion. An exothermic electronic component 13a centered on the circuit board is provided as a configuration having heat radiation fins 13b, and an electronic component 13c such as a power source and a noise filter is provided in the lower layer portion, and is provided so as to surround them. The case 8 of the main body 1 is partitioned by the unit case 9a. However, one of the outlets of the fan case 12b communicates with the upper layer side having the heat-generating electronic component 13a of the electronic unit 13 so that the air can be blown in at least two directions, and the other is detailed. Is configured to communicate with the induction heating unit 10 side having a heating coil, which will be described later.

  On the other hand, the induction heating unit 10 and the grill unit 11 include different heating means for cooking. Of these, the grill unit 11 will not be described in detail and will not be described in detail with respect to known configurations such as its specific configuration, and will be briefly described below with reference to FIG. 1. As a whole configuration, it is adjacent to the left side of the electrical component unit 9. The case 8 has a size that occupies approximately two-thirds (2/3) from the left side of the entire width of the case 8, and is surrounded by a metal heat shield 11a (see FIG. 3) that is also the outer case. 8 is partitioned. And as is well known, the inside of the heat shield plate 11a has a heater with sheathed wires on the upper and lower surfaces, and a net plate, a saucer, etc. on which the food to be heated is placed (not shown). , It is configured to be freely inserted and removed in the front.

  On the other hand, the induction heating unit 10 is provided in a shallow space region located above the electrical component unit 9 and the grill unit 11 in the case 8, that is, the unit case 9a and the heat shield plate 11a. The ceiling portion is the bottom surface, and the top plate 2 is the top surface. However, the induction heating unit 10, which will be described in detail later, has coil units 14 and 15 arranged side by side, elastically supports the coil units 14 and 15, and blows air from the fan unit 12. Are provided with a cooling duct 16 for guiding and a display PC board unit 17.

  Therefore, a specific configuration will be described with reference to FIGS. 4 is a longitudinal front view of an enlarged main part, FIG. 5 is a plan view of the main body 1 with the top plate 2 and the display PC board unit 17 removed, and FIG. 6 is an exploded view of one coil unit 14. A perspective view is shown. First, the configuration of the cooling duct 16 will be described with reference to FIGS. 3, 4, and 5. The cooling duct 16 is provided in the induction heating unit 10, and in this embodiment, the ceiling of the unit case 9 a and the heat shield plate 11 a. A part of the structure is used as a bottom surface, and a shallow (height) flat closed space is formed as a whole.

  Then, a suction port portion 16a (see FIGS. 1 and 2) for taking in air (cooling air) discharged from the fan case 12b of the fan unit 12 into the cooling duct 16 is provided on the right side of the unit case 9a on the bottom surface side. Forming. That is, the cooling air is taken in from the lower surface on the right end side of the cooling duct 16 and flows to the left end side to blow and cool a heating coil to be described later. The fan unit 12 and the cooling duct 16 cool the so-called heating coil. Means.

  However, the flat cooling duct 16 is formed in a reverse dish shape with a nonmagnetic conductive material such as aluminum except for the bottom portion described above, and the periphery thereof is screwed to the ceiling portion of the unit case 9a or the heat shield plate 11a. As shown in FIGS. 1 and 5, the upper surface of the upper surface has a surface area larger than these so as to surround each coil unit 14, 15. And the opening parts 19 and 20 (refer FIG. 3) of the same shape are formed in the upper and lower sides of this cooling duct 16, and the said coil units 14 and 15 are integrated correspondingly to this.

  First, the specific configuration of the coil units 14 and 15 will be described. However, each coil unit 14 and 15 is comprised from the heating coils 21 and 22 and the coil support members 23 and 24 which mount and support each heating coil 21 and 22 from the lower surface side, respectively. Since the coil units 14 and 15 have substantially the same configuration, the one (left side) coil unit 14 will be described below with reference to FIG.

First, the circular heating coil 21 includes an inner peripheral coil portion 21a and an outer peripheral coil portion 21b. The inner peripheral coil portion 21a is a small-diameter copper wire coil portion, the outer peripheral coil portion 21b is a large-diameter copper wire coil portion, and the two coil portions 21a and 21b are arranged concentrically. And it is set as the structure which spaced apart between the inner peripheral side coil part 21a and the outer peripheral side coil part 21b, and the predetermined clearance part 21c was provided.
Thus, in the present embodiment, the inner coil 21a and the outer coil 21b, which are the heating coils 21, are a single wire formed by twisting and knitting a number of individually insulated copper wires, so-called one coil. Thus, one heating coil 21 is formed.

  On the other hand, the coil support member 23 that supports the heating coil 21 from the lower surface side is made of a heat-resistant resin having a substantially disc shape as a whole as clearly shown in FIG. An opening 25 for direct cooling from the side is provided. Specifically, a large number of inner periphery side openings 25a and outer periphery side openings 25b are formed intermittently along the circumference.

  When the heating coil 21 is mounted on the coil support member 23, the coil support member 23 has a portion corresponding to the gap 21c between the inner peripheral coil portion 21a and the outer peripheral coil portion 21b. Is formed with an annular wall portion 27 so as to close it. Therefore, the lower surface side of the copper wire portion of the heating coil 21 is supported by the coil support member 23 with the lower surface side of the heating coil 21 exposed to the cooling duct 16 with respect to the plurality of inner periphery side openings 25a and outer periphery side openings 25b. It becomes the form made.

  Moreover, in the present embodiment, the outer periphery side opening 25b is formed to have a diameter larger than the outermost diameter of the heating coil 21, that is, the opening is greatly larger than the copper coil width of the outer periphery side coil portion 21b. Therefore, when the heating coil 21 is attached to the coil support member 23, a plurality of ventilation holes 26 (see FIGS. 3, 4, and 5) formed by gaps with a part of the outer peripheral side penetrating vertically are formed on the circumference. Become. However, since the inner circumferential side opening 25a has an opening shape equivalent to the width of the copper wire coil in the radial direction of the inner circumferential side coil portion 21a in the present embodiment, the inner circumferential side opening 25a is substantially in a fully closed state. There is no gap (see FIGS. 3, 4 and 5).

  Note that, on the other (right) coil support member 24 side (see FIG. 3), the vent hole 26 based on the opening 25 is formed in the same configuration as described above. Further, on the lower surface side of these coil support members 23 and 24, although not shown, ferrite for absorbing magnetic lines of force below the heating coils 21 and 22 is provided.

  In the present embodiment, as shown in FIGS. 3 and 4, temperature sensors 28 for detecting the temperature of the cooking container are respectively disposed in the central portions of the coil units 14 and 15. Hereinafter, the temperature sensor 28 on the one (right side) coil unit 14 side will be described in particular with reference to the enlarged longitudinal front view of FIG. 4. The temperature sensor 28 is provided with a heat sensitive part 29 in contact with the top plate 2 at the tip. A case main body 30 that supports 29, and a heat insulating material 31 sandwiched between the heat sensitive portion 29 at the upper portion of the case main body 30 and is fitted to a cylindrical boss portion 32 at the center of the coil support member 23 In this state, the temperature sensor 28 is mounted via a spring member 33 made of a compression coil spring so as to be biased upward.

  Therefore, the heat-sensitive part 29 is always incorporated in a state where it is pressed against the lower surface of the top plate 2. Further, the heat insulating material 31 is formed in a disk shape with a heat-resistant non-woven fabric or the like, surrounds the heat sensitive portion 29, and an outer peripheral end portion of the annular protruding portion that extends upward from the boss portion 32. It is pressed by 32 a and pressed against the lower surface of the top plate 2. A plurality of through holes 34 penetrating vertically are formed on the outer peripheral side of the protrusion 32a, and the protrusion 32a holds the heat insulating material 31 so that the heat insulating material 31 is not blocked above each through hole 34. ing.

  An arrow A shown in FIGS. 1 to 5 indicates a flow direction of so-called cooling air based on the outside air from the intake port 5 (see FIG. 1) and based on the air blown from the fan unit 12. For example, FIG. 5 is a plan view of the main body 1 with the top plate 2, the display PC board unit 17 and the like removed, and the cooling air enters the cooling duct 16 on the lower surface side of the coil unit 15 on the right side of the figure. It is taken in and flows in the duct 16 toward the coil unit 14 on the left side in the figure. At this time, since the cooling duct 16 has a flat configuration, it is desirable that there be no protrusion that causes wind resistance inside, but for example, the coil lead wire 35 cannot be avoided.

  Therefore, in the present embodiment, at least the coil lead wire 35 from the heating coil 22 on the right side of the drawing is drawn out along the flow direction of the wind indicated by the arrow A so as not to cause resistance on the upstream side of the cooling air. It is connected to the stand 36. From this terminal block 36, it leads out to the outer upper surface of the cooling duct 16, and is connected to the drive circuit etc. of the control apparatus which is not shown in figure. Incidentally, the height of the coil lead wire 35 is about 3 to 5 mm, and it can be easily estimated that it becomes a large resistance as a protrusion in the cooling duct 16 to be flattened. In FIG. 5, an intake duct 37 is provided on the right rear side of the main body 1 and communicates with the intake port 5 and the fan casing 12b. Further, an exhaust duct 38 through which cooling air is finally discharged to the outside is provided on the rear left side, and communicates with the exhaust port 6 (see FIG. 1) of the top plate 2.

  Here, a plurality of elastic support devices 39 that elastically support the coil units 14 and 15 having the heating coils 21 and 22 will be described. As described above, the surface area of the upper surface of the cooling duct 16 is such that the coil units 14 and 15 are surrounded by a continuous surface. Therefore, the means for elastically supporting the coil units 14 and 15 is erected in a plurality of places (for example, three places) for each unit in the cooling duct 16. Hereinafter, since all have a common configuration, the elastic support device 39 (one piece) for the coil unit 14 on the left side (leeward side) will be described with reference to FIG.

  The bottom surface of the cooling duct 16 shown in the figure corresponds to the ceiling portion of the heat shield plate 11 a that configures the grill unit 11. Accordingly, a plurality (three in this embodiment) of bolt members 40 are vertically fixed to the heat shield plate 11a beyond the height of the cooling duct 16. The upper coil support member 23 is fitted with a cylindrical holder 41 which is spaced from the bolt member 40 and is fitted around the outer periphery of the pair of holders 41. A spring member 42 urged upward is mounted between the heat shield plate 11a and the elastic support device 39 is erected on the heat shield plate 11a so as to be located inside the cooling duct 16.

  Thus, the coil unit 14 composed of the coil support member 23 and the heating coil 21 is lifted and supported in a state where the upward biasing force of the spring member 42 acts. In order to maintain a predetermined dimension between the heating coil 21 and the lower surface of the top plate 2 against this upward biasing force, spacers 43 (which may be integrated with the coil support member 23 or separate) may be interposed at a plurality of locations. ing. At this time, the outer peripheral end portion of the coil support member 23 is incorporated in the proximity or contact state with the upper surface of the cooling duct 16, that is, a large gap is not generated, but the height is reduced.

Next, the operation of the cooking device configured as described above will be described.
However, since the cooking operation is generally well known, it will be briefly described as follows. First, a cooking container such as a pan that accommodates an object to be heated is placed on the top plate 2. Now, for example, the case where the left and right heating units 3 and 4 shown in FIG. 1 are used will be described. When the cooking setting by the operation unit 14 or the heating power by the heating power setting display unit 7 is set and a start switch (not shown) is turned on, a control device (not shown) drives a driving means such as an inverter and the heating coils 21 and 22. For example, automatic cooking by induction heating is started through the cooking container, and cooking is automatically executed through temperature control by the temperature sensor 28 and timing operation.

  However, the magnetic field lines generated by the heating coils 21 and 22 during cooking are absorbed in the cooking container in the proper arrangement in the upper part and absorbed in the cooling duct 16 in the lower part, resulting in stable performance. Can be maintained, and the noise from the heating coils 21 and 22 and concerns such as radio wave interference can be avoided. This is because the cooling duct 16 is made of a nonmagnetic conductive material such as aluminum, and the upper surface of the cooling duct 16 has a surface area large enough to continuously surround the heating coils 21 and 22. Because.

With the start of the heating cooking, the blower fan 12a constituting the cooling means is also driven, and the outside air taken in from the intake port 5 and the intake duct 37 as shown in FIGS. Then, it branches into two directions in the case 8 and blows air, and the heat generation part is blown and cooled.
Hereinafter, in detail, one of the two branches flows into the cooling duct 16 side as clearly shown in FIG. 2, and the other flows into the electronic unit 13 side. On the electronic unit 13 side, air cooling is mainly performed on the heat-generating electronic component 13a and the like in the upper layer portion. Here, the case where the induction heating unit 10 side is blown and cooled through the cooling duct 16 will be described in detail.

  First, the inlet 16a of the cooling duct 16 shown in FIG. 2 is located on the lower surface side of the coil unit 15 having the heating coil 22 on the right side shown in FIGS. Intake as cooling air. Accordingly, the cooling air flowing into the cooling duct 16 flows from the right coil unit 15 side toward the left coil unit 14 side as indicated by an arrow A. Therefore, in this embodiment, as shown in FIG. 5, the coil lead wire 35 wired on the upstream side in the cooling duct 16 flat with respect to the cooling air flowing in the direction of arrow A is also drawn and wired in the same direction. Therefore, a smooth air blowing action is performed without causing a large resistance of the cooling air.

  Therefore, in FIG. 3, the main tendency of the cooling air is that the flow of air flows from the right side to the lower side of the left coil units 14 and 15 in the direction of arrow A in the direction of the arrow A. However, the heating coils 21 and 22 constituting the units 14 and 15 are supported on the lower surfaces thereof by the coil support members 23 and 24, and the openings 25 (inner peripheral side openings) of the support members 23 and 24. 25a and the outer peripheral opening 25b) are supported in a state where the lower surfaces of the heating coils 21 and 22 are exposed in the cooling duct 16. Therefore, the main cooling air on the lower surface side described above flows while cooling the coils 21 and 22 via the lower surface side of the heating coils 21 and 22.

  On the other hand, a plurality of ventilation holes 26 penetrating partly up and down where no copper wire portion is interposed are formed in the outer peripheral side opening 25b. Therefore, a part of the cooling air flows into the upper surface side from each ventilation hole 26 located in the outer peripheral portion of the heating coils 21 and 22 and flows while cooling the upper surface side of the coils 21 and 22. Furthermore, as clearly shown in FIG. 4, the cooling air can be moved from the lower surface side to the upper surface side also from the through-hole 34 provided around the temperature sensor 28. That is, the cooling air is also taken from the central portion of each heating coil 21, 22 to promote the cooling action on the upper surface side of the coil 21, 22. Thus, even on the upper surface side of the heating coils 21 and 22, an effective cooling action is performed by the cooling air taken in from the central portion and the outer peripheral portion.

  By the way, when the cooling air is taken into the upper surface side of the heating coils 21 and 22 from the periphery of the temperature sensor 28, the temperature sensor 28 may be cooled. Since it is surrounded, it is not exposed to the cooling air, and therefore the accuracy of temperature detection with respect to the cooking container is not impaired, and the heat insulating material 31 is held in place by the protrusion 32a, so that the through hole 34 is provided. There is no fear of blocking.

  The cooling air that has flowed through the upper and lower surfaces of the heating coils 21 and 22 passes through a predetermined exhaust route (not shown) through the closed space of the induction heating unit 10 and is exhausted from the exhaust duct 38 and the exhaust port 6 to the outside. Is done. Further, the cooling air on the electronic unit 13 side, whose explanation is simplified, is also collected in the same exhaust route as described above and exhausted through the exhaust duct 38.

As described above, the above embodiment has the following effects.
Since the magnetic lines of force generated from the heating coils 21 and 22 in the air can be absorbed using the cooling duct 16 made of aluminum (nonmagnetic conductive material) with the upper surface connected to the surroundings, stable performance can be maintained, Noise and radio interference can be reduced. Therefore, it is not necessary to separately provide a dedicated magnetic-shielding member around the heating coil, which is effective in reducing the number of parts and the number of assembly steps, simplifying the configuration, and being convenient and thin. In the implementation, it is conceivable that some irregularities and cuts are formed on the upper surface of the cooling duct 16, but almost the same effect can be expected to that extent. In short, the upper surface close to the periphery of the heating coils 21 and 22. As long as the configuration is continuous.

  The cooling air from the cooling duct 16 disposed on the lower surface side of the coil units 14 and 15 is effectively cooled from the lower surface side of the heating coils 21 and 22 facing the opening 25 provided in the coil support members 23 and 24. . In addition, in this embodiment, among the openings 25, the outer opening 25b is opened to have a larger diameter than the copper wire portions (coil width) of the outer coils 21b and 22b of the heating coils 21 and 22. Since a ventilation hole 26 having a gap penetrating vertically is formed in a part of the outer periphery, the cooling air can flow from the lower surface side to the upper surface side through the ventilation hole 26, and from the upper surface side of the heating coils 21 and 22. Cooling can be performed at the same time, and a sufficient cooling effect can be obtained and stable performance can be maintained.

  Further, in the present embodiment, the cooling air is taken into the central upper surface side from the plurality of through holes 34 in the vicinity thereof without directly applying the cooling air to the heat sensitive portion 29 of the temperature sensor 28 disposed in the center of each of the heating coils 21 and 22. Thus, the upper surface side of the heating coils 21 and 22 can be cooled more effectively, and the fear of a decrease in temperature detection accuracy due to cooling air can be avoided. However, the ventilation hole 26 and the through-hole 34 are not limited to the above-described embodiment, and can be implemented in an appropriate shape. Further, the temperature sensor 28 is not limited to the configuration arranged at the center of the heating coils 21 and 22, and a plurality of the temperature sensors 28 may be provided such as being arranged in the gap portions 21 c and 22 c (see FIG. 5).

  On the other hand, as a form of the heating coils 21 and 22 provided with the ventilation holes 26 as described above, a so-called two-divided configuration of the inner peripheral coil portions 21a and 22a and the outer peripheral coil portions 21b and 22b is adopted. This is effective in terms of preventing uneven heating for large pans and the like, but it is not limited to this, and it goes without saying that it can be easily applied to a form that is divided more than that, or vice versa. .

  In addition, the coil support members 23 and 24 that constitute the coil units 14 and 15 and support the heating coils 21 and 22 from the lower surface side have an assembly configuration in which their outer peripheral ends are close to or in contact with the upper surface of the cooling duct 16. Therefore, it is possible to obtain an assembly configuration in which the height dimension of the cooling duct 16 and the coil units 14 and 15 disposed on the upper surface side thereof is minimized, and the so-called induction heating unit 10 can be thinned. On the other hand, according to such a configuration, it is possible to prevent the cooling air from leaking out of the cooling duct 16 as early as possible from the outer peripheral ends of the coil support members 23 and 24. This is also effective in that the cooling air can be used efficiently because the pressure in the cooling duct 16 can be increased and the inflow movement of the cooling air from the main lower surface side to the upper surface side can be promoted.

  However, since an effective cooling action can be obtained as described above, the cooling duct 16 itself can also have a flat configuration, which is effective in further reducing the overall thickness. In this case, in this embodiment, as shown in FIG. 5, the coil lead wire 35 from the heating coil 22 located in the windward side in the cooling duct 16 is wired along the flow of the cooling air. Thus, a smooth flow in the cooling duct 16 can be expected by minimizing the flow resistance to the left of the figure, and a good cooling effect can be expected.

  Further, an elastic support device 39 that elastically supports the coil units 14 and 15 is erected in the cooling duct 16 as shown in FIG. This is because the cooling duct 16 can be erected inside the duct 16 by utilizing the fact that the surface area of the upper surface is made large so as to prevent the leakage of magnetic lines of force from the heating coils 21 and 22 in the air. This is advantageous in that it can be made more compact than a configuration provided outside.

7 and 8 show the second and third embodiments of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. I will explain the points.
(Second Embodiment)
FIG. 7 is a longitudinal side view of a main part showing a second embodiment of the present invention, and discloses a configuration on the coil unit 44 side corresponding to the coil unit 15 arranged on the right side (windward side) in the above embodiment. Yes. In the present embodiment, in particular, the means for elastically supporting the coil unit 44 is different, and the structure of the coil support member 45 and the cooling duct 46 for supporting the heating coil 22 based on this is also described in the above embodiment. It has a slightly different configuration.

First, the configuration of the coil support member 45 will be described. The opening 47 of the coil support member 45 includes both the inner periphery side coil portion 22a and the outer periphery side coil portion together with the inner periphery side opening portion 47a and the outer periphery side opening portion 47b. It differs from the said Example by the point made into the opening shape corresponded to the copper wire part (coil width) of 22b.
Therefore, when the heating coil 22 is attached to the coil support member 45, the opening 47 is closed by the copper wire portion of the heating coil 22 as shown in the figure, and naturally there is no gap penetrating vertically, so naturally the ventilation hole is formed. Is not formed.

  In contrast, the cooling duct 46 has a horizontal mounting edge 48 that wraps parallel to the horizontal outer peripheral end of the coil support member 45 at the periphery of the opening 20 that is the upper surface of the duct 46. It is said. And, by attaching an elastic body 49 such as foamed rubber between the mounting edge 48 and the opposing outer peripheral end of the coil support member 45, the coil unit 44 is urged upward. Yes. However, the coil support member 45 is provided with the same spacer 43 as in the above embodiment, and the heating coil 22 and the top plate 2 are maintained at a predetermined interval.

  A temperature sensor 50 is provided at the center of the coil unit 44. This is different from the temperature sensor 28 of the above embodiment only in that the heat insulating material 31 is not provided, and the heat-sensitive portion 29 is provided in a state of being pressed against the lower surface of the top plate 2. In addition, it is set as the structure which does not provide the through-hole penetrated up and down even if it exists in the boss | hub part 51 which fits and mounts this temperature sensor 50, and its periphery. In addition, the configuration of the right (windward) coil unit 44 described above is the same as that of the coil unit disposed on the left (leeward side) (not shown), and the other configurations are the same as in the above embodiment. .

  Thus, according to the second embodiment, the cooling air is guided to the cooling duct 46 and reaches the lower surface of the coil unit 44, and the coil 22 is cooled via the lower surface side of the heating coil 22 exposed from the opening 47. To do. That is, since the cooling air does not have a through hole or the like that flows into the upper surface side of the heating coil 22, a cooling operation mainly performed on the lower surface side of the coil 22 is performed. Of course, the cooling action for the heating coil on the leeward side (not shown) is similarly performed. Accordingly, there is no cooling effect on the heat sensitive portion 29 of the temperature sensor 50, and the heat insulating material 31 as in the first embodiment is unnecessary, and the original temperature detection function is exhibited.

  Thus, the configuration in which the cooling air substantially flows only on the lower surface side, and the configuration in which the coil unit 44 is elastically supported on the upper surface of the cooling duct 46 via the elastic body 49 is in contact with each other. Therefore, the structure is excellent in airtightness. Therefore, useless leakage of the cooling air can be prevented, the entire cooling air mainly composed of the lower surface can be effectively contributed to the cooling action, and effects other than the elastic support can be expected.

  However, the support means by the elastic body 49 such as foamed rubber can be diverted to the first embodiment. That is, even if it is configured to blow and cool the upper surface side of the heating coil, the same effects as described above can be expected, such as excellent airtightness on the lower surface side and prevention of unnecessary leakage of cooling air.

(Third embodiment)
FIG. 8 is a view corresponding to FIG. 5 showing a third embodiment of the present invention, which has a non-common configuration of coil units arranged on the left and right sides, so that a more efficient cooling effect can be obtained. Is. That is, in the configuration on the left side (leeward side) in the figure, the remaining configuration including the coil unit 14 is also a configuration corresponding to the first embodiment. On the other hand, on the right side (windward side), for example, the coil unit 44 disclosed in the second embodiment is employed. Therefore, the coil unit 14 having the ventilation holes 26 communicating with the upper and lower sides is disposed on the leeward side of the cooling air on the left side, whereas the closed coil unit having no ventilation holes on the upper side of the right side. 44 is arranged.

According to the above configuration, the cooling air taken into the cooling duct 16 flows from the lower surface side of the right coil unit 44 to the left side, and the heating coil 21 facing downward from the openings 25 and 47 of the left and right coil units 14 and 44. , 22 is cooled from the lower surface side.
In this case, for example, in the configuration in which the coil unit 15 on the windward side has the ventilation hole 26 as in the first embodiment, the cooling air flows from the ventilation hole 26 on the windward side immediately after flowing into the cooling duct 16 to the upper surface side. On the other hand, the air flow to the coil unit 14 side on the leeward side is reduced, and the flow rate from the relatively narrow ventilation hole 26 to the upper surface side tends to be reduced. May not be obtained.

  On the other hand, according to the present embodiment, since there is no ventilation hole in the coil unit 44 on the windward side, the cooling air does not immediately flow into the upper surface side of the heating coil 22, and therefore the air volume does not decrease rapidly. It flows to the leeward side and flows well from the lower surface side of the coil unit 14 to the upper surface side through the ventilation hole 26. As a result, the leeward air volume or wind pressure tends to decrease or weaken. However, on the windward side, the cooling air quickly passes only on the lower surface side of the coil support member 45, and sufficient cooling air is supplied to the leeward side having the above configuration. And a desired cooling effect in which the imbalance is corrected for the left and right heating coils 21 and 22 can be obtained.

  However, in the present embodiment, the right (windward) coil support member 45 is configured not to form a ventilation hole penetrating vertically, but the present invention is not limited thereto, and a ventilation hole having a small area may be provided. In other words, if the opening area of the vent hole 26 located on the leeward side is larger than the vent hole located on the upper side of the cooling air, the same effect as described above can be expected.

  The present invention is not limited to the embodiments described above and shown in the drawings. For example, the bottom surface of the cooling duct may be constituted by the duct itself instead of other constituent members, and the heating cooker is built-in. The present invention can be applied to both the type and the stationary type, and can be implemented with various modifications without departing from the gist of the present invention, such as a cooking device without a grill unit.

The disassembled perspective view of the heating cooker which shows 1st Example of this invention. Vertical side view of cooking device Longitudinal front view of main parts Longitudinal front view showing enlarged main parts Top view with top plate removed Exploded perspective view of coil unit Longitudinal side view of main part showing second embodiment of the present invention FIG. 5 equivalent diagram showing a third embodiment of the present invention.

Explanation of symbols

  In the drawings, 1 is a main body, 2 is a top plate, 8 is a case, 9 is an electrical component unit, 9a is a unit case, 10 is an induction heating unit, 11 is a grill unit, 11a is a heat shield, 12 is a fan unit, 14 , 15, 44 are coil units, 16, are cooling ducts, 21, 22 are heating coils, 23, 24, 45 are coil support members, 25, 47 are openings, 25a, 47a are inner peripheral openings, 25b, 47b is an opening on the outer peripheral side, 26 is a vent hole, 28 and 50 are temperature sensors, 39 is an elastic support device, 43 is a spacer, and 49 is an elastic body.

Claims (7)

The main body of the heating cooker,
A top plate that is provided so as to cover the upper surface of the main body and on which a cooking container such as a pan is placed;
A heating coil disposed under the top plate in the main body for inductively heating the cooking vessel;
In what comprises a cooling means for cooling the heating coil by blowing air from a fan unit,
The cooling means includes a cooling duct that guides cooling air from the fan unit to the lower surface of the heating coil,
The cooling duct is formed of a nonmagnetic conductive material, and has a structure in which an upper surface of the cooling duct has a surface area large enough to continuously surround the heating coil. . A coil support member for supporting the heating coil from the lower surface side;
The coil support member is provided with an opening corresponding to the copper wire portion of the heating coil, and at least a part of the opening is opened larger than the copper wire portion to form a vent hole penetrating vertically. The cooking device according to claim 1, wherein the cooking device is configured.   The cooking device according to claim 2, wherein the outer peripheral end portion of the coil support member is larger than the outer shape of the heating coil and is configured to be close to or in contact with the upper surface of the cooling duct.   The cooking device according to claim 3, wherein an elastic body such as foam rubber is interposed between the outer peripheral end of the coil support member and the upper surface of the cooling duct.   The cooking device according to claim 3, wherein a plurality of heating coils are provided, and the opening area of the ventilation holes located on the leeward side is larger than the ventilation holes located on the upstream side of the cooling air.   The cooking device according to claim 1, wherein the coil support member is elastically supported through a plurality of elastic support devices provided on a lower surface in the cooling duct.   The heating cooker according to claim 1, wherein the coil lead wire led out from the heating coil is arranged along the flow of cooling air in the cooling duct.

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