JP2009302072A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower-profile induction heating cooker that can uniformly cool an induction heating coil. <P>SOLUTION: The induction heating cooker comprises: the induction heating coil 11 for heating a heated object; a coil base 12d on which the induction heating coil 11 is placed; and a coil base unit 70 consisting of a shielding ring 17 annularly formed around the coil base 12d with a conductor. A cooling hole 22 is provided in a position as the projection plane of the induction heating coil 11 on the coil base 12d. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an induction heating cooker characterized by cooling an induction heating coil.

  Conventionally, an induction heating cooker induces an overcurrent with a high-frequency magnetic flux generated by passing a high-frequency current through an induction heating coil, and heats an object to be heated with Joule heat generated thereby. In recent years, the object to be heated has been diversified, and there are not only iron pans but also non-magnetic stainless steel pans, copper pans, aluminum pans, and the like. Along with this, induction heating cookers tend to be increased in output in order to realize cooking based on the type of object to be heated.

  The induction heating cooker with high output increases the effective frequency due to the skin effect to increase the frequency, and heat generation increases. Further, since the current value is increased, the self-heating of the induction heating coil is also increased. In order to increase the performance of such an induction heating cooker, it is required to efficiently cool the induction heating coil. Therefore, various induction heating cookers have been proposed in which the induction heating coil is efficiently cooled.

  As such, “a flat plate on which the object to be heated is placed, a heating coil located below the flat plate, a gap provided between the flat plate and the heating coil, a blower, and the heating A blowing induction wall that is located below the coil and induces a part of the wind generated by the blower to guide the wind upward from substantially the lower center of the heating coil, and the heating coil is substantially donut-shaped. An induction heating apparatus having a structure having a ventilation hole in the center has been proposed (for example, see Patent Document 1).

  In this induction heating cooker, a ventilation hole is provided in the center of the second heating coil, a temperature detection unit is provided in the ventilation hole, and a gap is provided between the flat plate and the second heating coil. The cooling air is distributed above and below the second heating coil, and is shielded by the arrangement of the temperature detection part, and is diffused radially around the ventilation hole on the lower surface of the second heating coil to have an equal strength. Yes.

  Further, “a coil unit comprising a top plate provided on a top frame on the top surface of the main body, and at least an induction heating coil and a coil base on which the induction heating coil is placed, provided below the top plate; An induction heating cooker comprising a fan device provided on the duct unit and a duct for guiding the air blown by the fan device to the coil unit, wherein a plurality of openings are provided on an upper surface of the duct located below the coil unit, An induction heating cooker characterized in that cooling air is ejected from a plurality of openings and collides against the lower surface of the coil unit has been proposed (see, for example, Patent Document 2).

  This induction heating cooker has a plurality of openings on the upper surface of the duct located below the coil unit, and forms a flow of a multi-hole collision jet that blows cooling air from the openings and collides with the lower surface of the coil unit. Therefore, the induction heating coil can be efficiently cooled with a low air volume, and the temperature distribution of the induction heating coil is reduced to increase the reliability.

JP-A-2004-171926 (page 7-10, FIG. 1) JP 2004-214217 A (page 5-7, FIG. 2)

  On the other hand, induction heating cookers tend to be smaller and thinner so that they can be installed in various places. In order to reduce the thickness, it is desirable to form a gap (gap) between the flat plate on which the object to be heated is placed and the heating coil for heating the object to be heated. However, since the induction heating cooker described in Patent Document 1 is provided with a predetermined gap between the flat plate and the second heating coil, the problem that the demand for thinning cannot be realized. was there.

  In addition, in the case of cooling the induction heating coil by blowing cooling air from the lower surface of the induction heating coil as in the induction heating cooker described in Patent Document 2, the gap between the top plate and the induction heating coil is reduced. Although the air passage cross-sectional area of the duct that guides the air blown by the fan device to the coil unit is constant, the cooling air that is blown out is biased depending on the position of the opening, and uniform cooling of the induction heating coil is possible. There was a problem that it could not be realized.

  The present invention has been made to solve the above problems, and provides an induction heating cooker that can uniformly cool an induction heating coil and that is thin.

  An induction heating cooker according to the present invention includes an induction heating coil that heats an object to be heated, a coil base on which the induction heating coil is placed, and a magnetic shielding ring that is annularly configured with a conductor around the coil base. An induction heating cooker provided with a coil base unit comprising: a ventilation hole provided at a position on the coil base that is a projection surface of the induction heating coil.

  An induction heating cooker according to the present invention includes an induction heating coil for heating an object to be heated, a coil base on which the induction heating coil is placed, and a rod-shaped ferrite provided radially on the lower surface of the coil base. In the induction heating cooker having a base unit, a fixing portion for fixing the induction heating coil having an opening formed on the induction heating coil side is provided on the upper side of the induction heating coil, and is placed on the coil base. The induction heating coil is fixed from above.

  An induction heating cooker according to the present invention includes an induction heating coil that heats an object to be heated, a coil base on which the induction heating coil is placed, and a magnetic shield ring that is formed annularly with a conductor around the coil base. An induction heating cooker provided with a coil base unit, wherein a ventilation hole is provided at a position to be a projection surface of the coil base induction heating coil, so that the outside of the induction heating coil can be cooled. The temperature can be effectively reduced.

  An induction heating cooker according to the present invention includes an induction heating coil for heating an object to be heated, an induction heating coil for heating the object to be heated, a coil base on which the induction heating coil is placed, and a lower surface of the coil base radially. In the induction heating cooker having a coil base unit made of a rod-shaped ferrite provided, a fixing portion for fixing the induction heating coil formed to be opened on the induction heating coil side is provided on the upper side of the induction heating coil, Since the induction heating coil placed on the coil base is fixed from the upper side, it is not necessary to invert and assemble the coil base in a state where silicon is applied, and the assemblability can be improved.

It is a disassembled perspective view which shows schematic structure of the induction heating cooking appliance which concerns on the reference example 1. FIG. It is a perspective view which shows an example of the shape of a duct. It is a perspective view which shows another example of the shape of a duct. It is a schematic block diagram which shows an example of the coil base and fan mounted in the induction heating cooking appliance which concerns on the reference example 2. FIG. It is a longitudinal cross-sectional view which shows the longitudinal cross-section of a coil base and a fan. It is a schematic block diagram which shows another example of the coil base and fan mounted in the induction heating cooking appliance which concerns on the reference example 2. FIG. It is a longitudinal cross-sectional view which shows the longitudinal cross-section of a coil base and a fan. It is a schematic block diagram which shows an example of the coil base and fan mounted in the induction heating cooking appliance which concerns on the reference example 3. FIG. It is a schematic sectional drawing which shows an example of the induction heating coil and coil base which are mounted in the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a schematic sectional drawing which shows another example of the induction heating coil and coil base which are mounted in the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a schematic sectional drawing which shows an example of the induction heating coil and coil base which are mounted in the induction heating cooking appliance which concerns on Embodiment 2. FIG.

Hereinafter, reference examples and embodiments of the present invention will be described with reference to the drawings.
Reference Example 1
FIG. 1 is an exploded perspective view showing a schematic configuration of an induction heating cooker 100 according to Reference Example 1 of the present invention. This induction heating cooker 100 has a built-in type (system kitchen integrated type) in which a cooking pan mounting part by induction heating is provided in two directions on the left and right, and a cooking pot mounting part by a client heater (RH) heating is provided in the back center. The case of an IH cooking heater will be described as an example. Based on FIG. 1, the structure of the induction heating cooking appliance 100 is demonstrated.

  As shown in FIG. 1, the induction heating cooker 100 is provided with a coil base 12, a duct 13, a fan 14, and a radiant heater 20 in a housing 10. In addition, an induction heating coil 11 for heating an object to be heated such as a pan or a frying pan is placed on the coil base 12. Note that two sets of the coil base 12, the duct 13, the fan 14, and the induction heating coil 11 are provided corresponding to the induction heating of two necks. Although not shown, a control board for controlling the heating of the induction heating coil 11 and components such as fins for cooling the control board are provided in the housing 10.

  In the induction heating coil 11, an eddy current is generated in the object to be heated placed above the induction heating coil 11 by the lines of magnetic force generated by the current, and the object to be heated itself generates heat. The coil base 12 serves to place and hold the induction heating coil 11. The coil base 12 is preferably provided with a ferrite for preventing the magnetic field lines generated from the induction heating coil 11 from flowing downward, and a temperature sensor for detecting the temperature state of the object to be heated. . The coil base 12 has an opening on the bottom surface for causing the air blown from the fan 14 to collide with the induction heating coil 11.

  The fan 14 blows air that cools the induction heating coil 11. In the reference example 1, the case where the fan 14 is a sirocco fan (blower fan) which is one of centrifugal fans is shown as an example, but the present invention is not limited to this. The duct 13 is disposed on the lower side of the coil base 12, and a plurality of discharge holes 16 through which air from the fan 14 is ejected toward the induction heating coil 11 are formed in the wall surface (upper surface) of the air passage. The duct 13 is formed in an annular shape, more specifically in a C shape so as to face the lower surface of the coil base 12. The details of the duct 13 will be described later (see FIGS. 2 and 3).

  The radial heater 20 is supplied with AC power of a normal commercial frequency, and the heater itself generates heat, so that the object to be heated is heated by the radiant heat. The coil base 12 is supported from below by a support member (not shown) and is pressed so as to be in close contact with the glass top 30. Moreover, this support member should just support the coil base 12, and does not specifically limit a kind and number.

  Here, a case where the top plate is a glass top 30 formed of heat-resistant glass or the like will be described as an example. The glass top 30 is made of heat-resistant glass or the like and is provided on the upper surface of the housing 10. And the to-be-heated material to be heated can be mounted. The glass top 30 is formed with three pan mounting portions 31. The pan placing unit 31 indicates a part on which the object to be heated is placed on the glass top 30. In other words, the pan placing portion 31 is disposed on the right and left sides of the housing 10 so as to correspond to the induction heating coil 11, and is disposed substantially in the center of the housing 10 so as to correspond to the radiant heater 20. .

  An operation panel (not shown) for receiving support from the user is provided on the front surface of the housing 10. That is, when an instruction is given from the user via the operation panel, the control board (not shown) controls the induction heating coil 11 and the radiant heater 20 based on the contents of the instruction. The control board controls the heating of the induction heating coil 11 and the radiant heater 20 based on the detected temperature from a temperature sensor (not shown).

  Here, a case where a plurality of air holes are formed on the front surface and the back surface of the housing 10 is shown as an example, but the present invention is not limited to this. For example, the front vent may not be provided, and the vents may be formed in the rear portion of the glass top 30 without the front and rear vents. Moreover, although the case where the glass top 30 is comprised with the heat resistant glass is shown as an example, it is not limited to this. Furthermore, although only the pan mounting part 31 is illustrated in the glass top 30, it is not limited to this.

  FIG. 2 is a perspective view showing an example of the shape of the duct. Based on FIG. 2, the duct 13 which is a characteristic part of the reference example 1 will be described. FIG. 2 shows an example in which the fan 14 is connected to the duct 13 via the suction port 15. The duct 13 is formed in an annular shape so as to face the lower surface of the coil base 12 so that the coil base 12 can be placed on the top thereof. A plurality of discharge holes 16 for ejecting air blown from the fan 14 are formed on the wall surface above the duct 13 (that is, the mounting surface of the coil base 12).

  Further, the upper surface of the duct 13 is formed so as to be inclined in the traveling direction of the air blown from the fan 14. This is because air is uniformly ejected from the discharge holes 16 by gradually narrowing the air path of the air (that is, gradually decreasing the area of the cross section of the air path). In the case where the air passage has a constant size, even if a plurality of discharge holes 16 are formed, the air ejection is biased, and the induction heating coil 11 cannot be efficiently and uniformly cooled. Therefore, the duct 13 mounted on the induction heating cooker 100 makes the amount of air ejected from each discharge hole 16 uniform in consideration of the pressure loss in the air passage.

  That is, the air blown from the fan 14 is ejected in order from the discharge hole 16 closer to the suction port 15, but the force (pressure) ejected decreases as the distance from the suction port 15 increases. If it does so, air will not collide uniformly with the induction heating coil 11, and the cooling of the induction heating coil 11 will be biased. In the first reference example, the air passage cross-sectional area is sequentially reduced by an amount to compensate for the pressure loss of the air component ejected from the discharge hole 16 closer to the suction port 15 so that air is uniformly ejected from each discharge hole 16. I made it.

  In other words, the duct 13 is formed so as to gradually reduce the area of the air passage cross section based on the balance between the amount of air ejected from the discharge hole 16 and the pressure in the air passage. By doing so, air for cooling the induction heating coil 11 is uniformly ejected from each discharge hole 16 of the duct 13, so that the induction heating coil 11 can be uniformly cooled and effective cooling can be realized. become. The number of discharge holes 16 may be determined based on the balance between the amount of air blown and the pressure in the air passage.

  FIG. 3 is a perspective view showing another example of the shape of the duct. Based on FIG. 3, the duct 13a which is the characteristic part of this reference example 1 is demonstrated. FIG. 3 shows an example in which the fan 14 is connected to the duct 13a via the suction port 15. The duct 13a is formed in an annular shape so as to face the lower surface of the coil base 12 so that the coil base 12 can be placed on the duct 13a. A plurality of discharge holes 16 for ejecting air blown from the fan 14 are formed in the wall surface above the duct 13a (that is, the mounting surface of the coil base 12).

  The difference from the duct 13 described above is that the upper surface of the duct 13a is not inclined in the traveling direction of the blown air. That is, the duct 13a is formed so that the upper surface thereof is substantially parallel to the lower surface of the coil base 12, and the lower surface is formed so as to be inclined toward the traveling direction of the blown air. The reason for inclining is the same as in the case of the duct 13. Further, in the duct 13, there is a difference in the distance from each discharge hole 16 to the coil base 12, and although air can be ejected uniformly, a difference occurs in the momentum of the air that collides with the induction heating coil 11.

  In order to eliminate this problem, the duct 13a has a lower surface that is inclined. In addition, a space is created as much as the slope is provided on the lower surface of the duct 13a. If this space is used, further space saving can be realized. For example, a control board or the like that controls a motor or the like that rotates the induction heating coil 11 or the fan 14 may be disposed in the space. That is, the duct 13a can efficiently cool the induction heating coil 11 and can further reduce the size of the induction heating cooker 100.

  In Reference Example 1, the case where the discharge holes 16 are formed in a circular shape is shown as an example, but the present invention is not limited to this. For example, the discharge hole 16 may be formed in an elliptical shape or a polygonal shape. As described above, the number of the discharge holes 16 changes the amount of air blown by the fan 14 in conjunction with the pressure loss in the air passage, so it is preferable to determine the number based on the balance between them. Further, the size of the discharge hole 16 is not particularly limited.

Next, the cooling of the induction heating coil 11 will be briefly described.
First, the fan 14 sucks air from the ventilation hole on the back surface (back side) of the housing 10 and blows the air to the duct 13 and the duct 13 a through the suction port 15. The air blown to the duct 13 and the duct 13a is sequentially ejected from the discharge hole 16 closer to the suction port 15. The air passages of the duct 13 and the duct 13a are gradually narrowed in consideration of the pressure loss as described above. Therefore, even if the discharge hole 16 is far from the suction port 15, the air ejected from the discharge hole 16 is uniform.

  The ejected air collides with the lower surface of the coil base 12 and cools the induction heating coil 11. Since air collides uniformly, the induction heating coil 11 can be efficiently cooled. The temperature of the air that has cooled the induction heating coil 11 rises due to heat exchange with the induction heating coil 11, flows along the lower surface of the glass top 30, and flows outward from the vent on the back surface (back side) of the housing 10. Exhausted.

  Here, although the case where the air intake / exhaust is performed by the air vent provided in the back surface (back side) of the housing 10 has been described as an example, the present invention is not limited thereto. For example, a ventilation hole may be formed in the rear part (back side) of the glass top 30, and air may be sucked and exhausted from the ventilation hole. If the heat generating parts such as a control board (not shown) are cooled by using the air sucked into the fan 14, parts other than the induction heating coil 11 can be efficiently cooled.

Reference Example 2
FIG. 4 is a schematic configuration diagram illustrating an example of a coil base 12a and a fan 14a mounted on an induction heating cooker according to Reference Example 2 of the present invention. Based on FIG. 4, the coil base 12a and the fan 14a which are the characteristic parts of the reference example 2 are demonstrated. Reference Example 2 will be described with a focus on differences from Reference Example 1. The same parts as in Reference Example 1 will be denoted by the same reference numerals and description thereof will be omitted. Similarly to the coil base 12, the coil base 12 a has an opening on the bottom surface for causing the air blown from the fan 14 a to collide (contact) with the induction heating coil 11.

  In Reference Example 2, the fan 14a is arranged below the coil base 12a. An opening 40a is provided at the central portion of the coil base 12a, and the fan 14a is laminated on the lower side of the coil base 12a so that the air inlet 45 of the fan 14a faces the opening 40a. In addition, since the fan 14a has shown the case where it is a sirocco fan as an example, the air inlet 45 which suck | inhales air in the center part is provided. Then, air is sucked from above the coil base 12a. That is, a gap is provided between the coil base 12a on which the induction heating coil 11 is placed and the glass top 30, and air is introduced from the opening 40a communicating with the gap.

  First, the induction heating coil 11 can be cooled from the upper side using air sucked into the fan 14a. Then, the air sucked by the fan 14a is blown to the lower side of the induction heating coil 11, and the lower side of the induction heating coil 11 is cooled. That is, the induction heating coil 11 can be cooled from above and below with one fan 14a. Therefore, the induction heating coil 11 can be efficiently cooled. Further, since the coil base 12a and the fan 14a are arranged so as to be stacked, further space saving can be realized.

  FIG. 5 is a longitudinal sectional view showing longitudinal sections of the coil base 12a and the fan 14a. In FIG. 5, the glass top 30 is shown. As shown in the figure, a gap is provided between the coil base 12 a and the glass top 30. Air is introduced through the opening 40a communicating with the gap. That is, air flows from the opening 40a formed in the central portion of the coil base 12a to the suction port 45 of the fan 14a, and the induction heating coil 11 is cooled by the air flowing through the gap.

  Then, the air sucked by the fan 14a is blown to the lower side of the induction heating coil 11, and the lower side of the induction heating coil 11 is cooled. Therefore, the induction heating coil 11 can be cooled from above and below, and the induction heating coil 11 can be efficiently cooled. Note that the distance of the gap between the coil base 12a and the glass top 30 is not particularly limited. For example, it may be determined based on the amount of air to be taken in or the performance of the fan 14a.

  FIG. 6 is a schematic configuration diagram illustrating another example of the coil base 12b and the fan 14b mounted in the induction heating cooker according to Reference Example 2 of the present invention. Based on FIG. 6, the coil base 12b and the fan 14b which are the characteristic parts of the reference example 2 are demonstrated. The difference between the coil base 12a and the fan 14a described above will be mainly described. A centrifugal fan is applied to the fan 14b shown in FIG. 6 instead of a sirocco fan. Similarly to the coil base 12, the coil base 12 b has an opening on the bottom surface for causing the air blown from the fan 14 b to collide (contact) with the induction heating coil 11.

  The centrifugal fan is a fan that blows air in the centrifugal direction. The sirocco fan applied to the fan 14a is also a kind of centrifugal fan. That is, if a centrifugal fan is applied to the fan 14a or the fan 14b, the flow of air sucked from the opening 40a and the opening 40b can be changed in the horizontal direction, so that the induction heating coil 11 is effectively cooled. Is possible. In addition to the sirocco fan, the centrifugal fan includes a turbo fan and a paddle fan. Further, since the coil base 12b and the fan 14b are arranged so as to be laminated, further space saving can be realized.

  FIG. 7 is a longitudinal sectional view showing longitudinal sections of the coil base 12b and the fan 14b. In FIG. 7, the glass top 30 is shown. As shown in the figure, a gap is provided between the coil base 12 b and the glass top 30. Air is taken in from the opening 40b communicating with the gap. That is, air flows from the opening 40b formed in the central portion of the coil base 12b to the fan 14b, and the induction heating coil 11 is cooled by the air flowing through the gap. Then, the air sucked by the fan 14b is blown to the lower side of the induction heating coil 11, and the lower side of the induction heating coil 11 is cooled.

Reference Example 3.
FIG. 8: is a schematic block diagram which shows an example of the coil base 12c and the fan 14c which are mounted in the induction heating cooking appliance which concerns on the reference example 3 of this invention. Based on FIG. 8, the coil base 12c and the fan 14c which are the characteristic parts of the reference example 3 are demonstrated. In Reference Example 3, differences from Reference Example 1 and Reference Example 2 will be mainly described, and the same parts as those in Reference Example 1 and Reference Example 2 will be denoted by the same reference numerals and description thereof will be omitted. Similarly to the coil base 12, the coil base 12 c also has an opening on the bottom surface for causing air blown from the fan 14 c to collide (contact) with the induction heating coil 11.

  In the reference example 3, the fan 14c is stacked on the lower side of the coil base 12c. An opening 40c is provided in the central portion of the coil base 12a, and the fan 14c is stacked on the lower side of the coil base 12c so that the air inlet 45 of the fan 14c faces the opening 40c. Then, air is sucked from above the coil base 12c. That is, a gap is provided between the coil base 12c on which the induction heating coil 11 is placed and the glass top 30, and air is taken in from the opening 40c communicating with the gap.

  First, the induction heating coil 11 can be cooled from the upper side using the air sucked into the fan 14c. Then, the air sucked by the fan 14c is blown to the lower side of the induction heating coil 11, and the lower side of the induction heating coil 11 is cooled. That is, since the induction heating coil 11 can be cooled from above and below with one fan 14a, the induction heating coil 11 can be efficiently cooled.

  In the reference example 2, a case where the periphery of the fan 14a and the fan 14b is opened is shown as an example. However, in the reference example 3, the fan 14a is attached to the fan 14c so as to face the lower surface of the coil base 12c. ) Shaped air passage is formed, and a guide 60 having an open upper surface of the air passage is provided to effectively use air blown from the fan 14c. By controlling the air flow in this way, effective use of air used for cooling the induction heating coil 11 can be realized, and the induction heating coil 11 can be effectively cooled.

  The guide 60 has a spiral air path so that air flows from the air inlet 45 of the fan 14c to the outside. Thus, the air can be caused to collide (contact) with the lower surface of the induction heating coil 11 without leaking or escaping, and the induction heating coil 11 can be effectively cooled. In addition, the number of spirals in the air passage, the air passage volume, and the like are not particularly limited. Here, the case where the fan 14c is a sirocco fan is shown as an example, but the present invention is not limited to this. For example, the fan 14c may be a centrifugal fan similar to the fan 14b, or may be another centrifugal fan.

Embodiment 1 FIG.
FIG. 9 is a schematic configuration diagram showing an example of a coil base 12d mounted on the induction heating cooker according to Embodiment 1 of the present invention. Based on FIG. 9, the induction heating coil 11 and the coil base 12d, which are the characteristic portions of the first embodiment, will be described. In the first embodiment, differences from Reference Example 1 to Reference Example 3 will be mainly described, and the same parts as those in Reference Examples 1 to 3 will be denoted by the same reference numerals and description thereof will be omitted. . Similarly to the coil base 12, the coil base 12 d has an opening 40 d on the bottom surface for causing air blown from a fan (not shown) to collide (contact) with the induction heating coil 11.

  The induction heating cooker according to Embodiment 1 is provided under the glass top 30 on which the object to be heated such as a pan is placed, and generates a magnetic field on the object to be heated in order to perform induction heating cooking. An induction heating coil 11 for causing an eddy current to flow and heating, a coil base 12d for holding the induction heating coil 11, and a magnetic shield ring 17 formed in a ring shape with a conductor around the coil base 12d. Has been. The induction heating coil 11, the coil base 12 d, and the magnetic shield ring 17 constitute a coil base unit 70. In addition, a cooling hole 22 that is a ventilation hole is provided at a position that is a projection surface of the induction heating coil 11 of the coil base 12d. The cooling hole 22 is provided on the holding surface of the coil base 12 d that holds the induction heating coil 11, and the jet cooling air is effectively brought into contact with the induction heating coil 11. Furthermore, the coil base unit 70 is held by an elastic body (not shown) such as a spring, for example, in contact with the back surface of the glass top 30.

  The induction heating coil 11 needs to cool the induction heating coil 11 in order to generate a magnetic field and generate self-heating during operation. For this reason, in this Embodiment 1, the cooling hole 22 is provided between the induction heating coil 11 and the magnetic-shielding ring 17 (position used as the projection surface of the induction heating coil 11 of the coil base 12d), and the induction heating coil 11 is made. Cooling is effective from below. That is, the induction heating coil 11 is cooled by guiding the jet cooling air from the opening 40 d of the coil base 12 d provided below the induction heating coil 11 to the cooling hole 22.

  However, for example, in the case of the induction heating coil 11 (induction heating coil 11a and induction heating coil 11b shown in FIG. 9) having a double circle configuration concentrically on the inner side and the outer side, the induction heating coil 11a may be used depending on the control method. Since the current applied to the induction heating coil 11b is different, the outer induction heating coil 11a may generate more heat. In this case, it is desirable to increase the amount of cooling air to the induction heating coil 11a that generates more heat.

  Therefore, in the first embodiment, the cooling hole 22 is expanded in the outer peripheral direction of the outer induction heating coil 11a, and the jet cooling air brought into contact with the induction heating coil 11a is increased. In other words, the cooling hole 22 is not limited to the projection surface of the induction heating coil 11 of the coil base 12d but is expanded in the outer peripheral direction, so that the jet cooling air is effectively blown to the induction heating coil 11. By doing so, the cooling air can be brought into contact with not only the bottom surface of the induction heating coil 11 but also the side surface, so that a larger cooling area can be obtained.

  FIG. 10 is a schematic configuration diagram showing another example of the coil base 12d mounted on the induction heating cooker according to Embodiment 1 of the present invention. Based on FIG. 10, another example of the induction heating coil 11 and the coil base 12d, which is a characteristic part of the first embodiment, will be described. In FIG. 10, the induction heating coil 11 is divided into an induction heating coil 11a and an induction heating coil 11b so as to form a double structure concentrically with the inner side and the outer side, and the divided induction heating coil 11a and induction heating coil 11a are divided. A holding portion 23 for holding the induction heating coil 11 is provided on the coil base 12d between the coils 11b. In addition, a wind direction plate 24 is provided on the lower surface side of the holding portion 23 so that the jet cooling air jetted from below flows outward in the radial direction of the induction heating coil 11.

  With such a configuration, not only the cooling hole 22 provided in the coil base 12d but also the cooling air blown to the holding portion 23 can be guided to the outer induction heating coil 11a, and the induction heating coil 11a is made larger. It can be cooled with air volume. That is, on the lower surface of the coil base 12 that holds the induction heating coil 11 (the lower surface side of the holding portion 23), the wind direction plate 24 having an inclined surface that makes the cooling air from below become an obtuse angle is provided. It is. Therefore, by combining with the cooling hole 22, a larger amount of air can be introduced, so that the cooling performance of the induction heating coil 11a can be improved.

Embodiment 2. FIG.
FIG. 11: is a schematic block diagram which shows an example of the coil base 12e mounted in the induction heating cooking appliance concerning Embodiment 2 of this invention. Based on FIG. 11, a method for fixing the induction heating coil 11 and the coil base 12e, which is a characteristic part of the second embodiment, will be described. In the second embodiment, differences from the first to third embodiments and the first embodiment will be mainly described, and the same parts as those in the first to third embodiments and the first embodiment will be denoted by the same reference numerals. Shall be omitted.

  The second embodiment has a configuration including a coil base unit 70a including an induction heating coil 11 that performs induction heating, a coil base 12e, and a ferrite core 18 that guides a downward magnetic flux upward. Conventionally, an adhesive such as silicon is generally used to fix the induction heating coil 11 and the ferrite core 18 to the coil base 12e.

  However, since the induction heating coil 11 is on the upper surface side of the coil base 12e, the ferrite core 18 is on the lower surface of the coil base 12e. Therefore, the induction heating coil 11 and the ferrite core 18 are provided on the coil base 12e. Both of the induction heating coil 11 and the ferrite core 18 must be fixed, the coil base 12e must be reversed and the other must be fixed in the same manner. It was a bad composition.

  In order to improve such assemblability, in the second embodiment, a fixing portion 23a for fixing (fixing) the induction heating coil 11 having an opening formed on the induction heating coil 11 side is provided on the upper side of the induction heating coil 11. The induction heating coil 11 placed on the coil base 12e is fixed from above. That is, as shown in FIG. 11, the induction heating coil 11a and the induction heating coil 11b placed on the coil base 12e are fixed so as to cover from above. In addition, this fixing | fixed part 23a may be formed as a recessed part shape which fixes the induction heating coil 11b, and may be formed as a shape which does not have one (outside) side surface which fixes the induction heating coil 11a. .

  That is, if the adhesive applied to the fixing portion 23a that fixes the induction heating coil 11a and the induction heating coil 11b is made of silicon having high viscosity, a shape that does not have a side surface that fixes the induction heating coil 11a is formed. Even so, the induction heating coil 11a can be fixed. And after apply | coating an adhesive agent to this fixing | fixed part 23a, the induction heating coil 11 (The induction heating coil 11a and the induction heating coil 11b) is inserted and fixed. In addition, it is good for the fixing | fixed part 23a to set it as the structure which can insert the ferrite core 18 after the induction heating coil 11 is fixed.

  Further, the fixing portion 23a may be configured such that a ferrite cover 19 having electrical insulation can be inserted between the induction heating coil 11 and the ferrite core 18. When assembling the coil base unit 70a, the coil base 12e is turned upside down, and after applying the adhesive, the induction heating coil 11, the ferrite cover 19, and the ferrite core 18 are laminated in this order for bonding. It becomes possible. Therefore, assembling is improved by assembling with this configuration.

  In the reference examples 1 to 3, the first embodiment, and the second embodiment, the case where the induction heating cooker is provided with two induction heating coils (the induction heating coil 11a and the induction heating coil 11b) has been described as an example. However, the present invention is not limited to this. For example, an induction heating cooker having one induction heating coil or an induction heating cooker having three or more induction heating coils may be used. In Reference Example 2, Reference Example 3, and Embodiment 1, the glass top molded with glass as the top plate has been described as an example. However, the present invention is not limited to this.

  Further, in each of the above embodiments, the case where the induction heating cooker is used for a built-in type (system kitchen integrated type) IH cooking heater has been described as an example. However, the present invention is not limited to this. Needless to say, the same effects can be obtained even when used in a cooking heater. Furthermore, you may provide a horizontal part in the part of the inclined part of the duct 13 and the duct 13a in the range from which the air ejected from the discharge hole 16 becomes uniform.

  10 Housing, 11 Induction heating coil, 11a Induction heating coil, 11b Induction heating coil, 12 Coil base, 12a Coil base, 12b Coil base, 12c Coil base, 12d Coil base, 12e Coil base, 13 Duct, 13a Duct, 14 Fan, 14a Fan, 14b Fan, 14c Fan, 15 Suction port, 16 Discharge hole, 17 Magnetic shield, 18 Ferrite core, 19 Ferrite cover, 20 Radiant heater, 21 Support member, 22 Cooling hole, 23 Holding part, 23a Fixing part , 24 Wind direction plate, 30 Glass top, 31 Pan mounting part, 40 opening part, 40a opening part, 40b opening part, 40c opening part, 40d opening part, 50, motor, 60 guide, 70 coil base unit, 70a coil base Unit , 100 induction heating cooker.

Claims (5)

An induction heating coil for heating an object to be heated;
A coil base on which the induction heating coil is placed;
An induction heating cooker provided with a coil base unit comprising a magnetic shielding ring formed annularly with a conductor around the coil base,
An induction heating cooker characterized in that a ventilation hole is provided at a position on the coil base that is a projection surface of the induction heating coil. The induction heating cooker according to claim 1, wherein the vent hole is widened in an outer peripheral direction of the coil base. A holding part for holding the induction heating coil is provided on the coil base,
The induction heating cooker according to claim 1 or 2, wherein an inclined surface is provided on a lower surface side of the holding portion so that cooling air blown from below becomes an obtuse angle and collides with the induction heating coil. . An induction heating coil for heating an object to be heated;
A coil base on which the induction heating coil is placed;
In an induction heating cooker having a coil base unit made of rod-shaped ferrite provided radially on the lower surface of the coil base,
A fixing portion for fixing the induction heating coil formed on the induction heating coil side is provided on the upper side of the induction heating coil, and the induction heating coil mounted on the coil base is fixed from the upper side. Induction heating cooker characterized by. In the fixing part,
The induction heating cooker according to claim 4, wherein the induction heating coil, an insulator that insulates the induction heating coil and the ferrite, and the ferrite are sequentially laminated.

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