JP2004039263A - Electromagnetic cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To configure an elecromagnetic cooker in which the size of a cooling fan and a cooling motor is reduced while maintaining a cooling function, and a noise (rotational noise) to be generated is substantially reduced. <P>SOLUTION: The electromagnetic cooker comprises a housing including a suction port and a discharge port, an air blowing part, a partition wall part having a plurality of jet blowing holes, a heating coil arranged on an upper side of the partition wall part, and a circuit part supplying a current to the heating coil. The air blowing part, the partition wall part, the heating coil, and the circuit part are arranged in the housing. A air current delivered from the air blowing part passes along the circuit part, via the jet blowing hole of the partition wall to form a jet flow. When the jet flow crashes into the heating coil, the heating coil is cooled down. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic cooker, and more particularly to an electromagnetic cooker having a heating coil and a cooling housing for cooling a semiconductor circuit device.
[0002]
[Prior art]
The electromagnetic cooker uses a heating coil (electromagnetic induction coil) to form an eddy current at the bottom of the pot without using a flame, thereby causing the pot itself to generate heat, thereby being highly safe. In addition, the electromagnetic cooker is a very excellent cookware because it has high thermal efficiency and can save time and cost required for cooking. For this reason, electromagnetic cookers have become more and more popular in recent years at a rate exceeding that of conventional gas cookers.
[0003]
Here, the conventional electromagnetic cooker will be described in detail with reference to FIGS. 1 and 10. In FIG. 1, the electromagnetic cooker 1 generally includes a top plate 5 formed of glass or the like, a grill unit 6, a dial-type heating power adjustment unit 7, and a display unit 8. In addition, a cooling housing (housing) 110 is formed in the electromagnetic cooker 1 as shown by a broken line in FIG.
[0004]
As shown in FIG. 10, the cooling housing 110 has an upper surface covered by a top plate 5 and generally has an electromagnetic induction coil or a heating coil 112 therein and a large current supplied thereto. A semiconductor circuit device 114 such as a series of power modules, a cooling motor 116 for cooling the heating coil 112 and the power module 114 by air, and a cooling fan (blower unit) 117 are provided. The heating coil 112 is supported by a partition wall 120 via a spring 118, and a gap 122 is formed between the heating coil 112 and the partition wall 120 at regular intervals. The semiconductor circuit device 114 is mounted on two wiring boards 115 and is electrically connected to the heating coil 112 (not shown). The cooling motor 116 and the cooling fan 117 are designed to be driven according to the heat generated by the heating coil 112 and the power module 114.
[0005]
The cooling housing 110 has an inlet 124 for taking in air from the outside and an outlet 126 for discharging air to the outside. In addition, the partition 120 has a communication hole 130 provided immediately below a substantially central portion of the heating coil 112. When the cooling fan 117 rotates, the air taken in from the suction port 124 becomes an air current, flows along the power module 114 and the wiring board 115 as indicated by arrows, and air-cools them. Similarly, the airflow passes through the communication hole 130 and flows along the heating coil 112 in parallel with the gap 122 between the heating coil 112 and the partition wall 120 to exhaust heat generated from the heating coil 112.
[0006]
[Problems to be solved by the invention]
However, in the cooling housing 110 of the electromagnetic cooker 1 having such a structure, it is not easy to sufficiently exhaust particularly the heat generated from the heating coil 112, and the amount of air flowing through the gap 122 between the heating coil 112 and the partition 120 is reduced. By increasing, the normal operation of the electromagnetic cooker 1 was guaranteed. That is, in order to secure a sufficient cooling function, it is necessary to increase the size of the cooling fan 117 and the cooling motor 116 or to increase the number of rotations. Therefore, it is inevitable that the space occupied by the cooling motor 116 and the cooling fan 117 increases, and it has been difficult to reduce the noise (rotation noise) due to the high-speed rotation.
[0007]
Therefore, the present invention has been made to solve such a problem, and an electromagnetic cooker that reduces the size of the cooling fan 117 and the cooling motor 116 while maintaining the cooling function, and further substantially reduces noise caused by the cooling motor 116. It is intended to constitute.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, a housing having a suction port and a discharge port, a blower, a partition having a plurality of jet outlets, and a heating coil disposed above the partition. With a circuit unit that supplies current to the heating coil, a blowing unit, a partition unit, a heating coil, and a circuit unit are arranged in the housing, and the airflow sent from the blowing unit passes along the circuit unit, An electromagnetic cooker in which a jet is formed through a jet outlet of a partition wall and the jet collides with the heating coil to cool the heating coil can be provided. Since the cooling effect of the impinging jet is much higher than the cooling effect of the airflow flowing parallel to the heating coil, the amount of air required to exhaust a certain amount of heat can be significantly reduced. The blower can be downsized, and the noise generated from the blower can be extremely reduced.
[0009]
According to the second aspect of the present invention, a housing having an inlet and an outlet, a blower, a chamber having an inlet and a plurality of jet outlets, and a heating coil disposed above the chamber. And a circuit unit for supplying a current to the heating coil, and a blowing unit, a chamber, a heating coil, and the circuit unit are disposed in the housing, and an airflow sent from the blowing unit passes along the circuit unit, It is possible to provide an electromagnetic cooker in which the heating coil is cooled by being introduced into the inlet of the chamber and forming a jet through the jet outlet, and the jet colliding with the heating coil. In this way, the static pressure in the chamber can be increased more than the static pressure in the cooling housing, and a jet having a higher flow velocity can be formed. Thus, the size of the blower can be further reduced, and the noise generated from the blower can be further reduced.
[0010]
According to the third aspect of the present invention, it is possible to provide an electromagnetic cooker in which the inlet of the chamber is disposed substantially immediately below the center of the heating coil. Since the static pressure in the chamber is formed symmetrically around the inlet, the heating coil can be cooled symmetrically with respect to the center of the heating coil.
[0011]
According to the fourth aspect of the present invention, it is possible to provide an electromagnetic cooker in which the plurality of jet outlets have such a size and configuration that the jet uniformly removes heat generated from the heating coil. The upstream-side jet outlet has a smaller opening area than the downstream-side jet outlet, or the arrangement density of the jet outlets is made coarser on the downstream side than on the upstream side, so that the heating coil can be shifted depending on the position. And can be cooled uniformly.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a semiconductor sealing device according to the present invention will be described with reference to the accompanying drawings. In the description of the embodiments, terms indicating directions (for example, “upper”, “lower”, “right”, and “left”) are used as appropriate for easy understanding. They are not intended to limit the invention.
[0013]
Embodiment 1 FIG.
Embodiment 1 of the electromagnetic cooker according to the present invention will be described in detail below with reference to FIGS. In FIG. 1, the electromagnetic cooker 1 generally includes a top plate 5 formed of glass or the like, a grill unit 6, a dial-type heating power adjustment unit 7, and a display unit 8. In addition, a cooling housing (housing) 10 is formed in the electromagnetic cooker 1 as shown by a broken line in FIG. In the embodiment described below, the cooling housing 10 is arranged above the electromagnetic cooker 1, but the arrangement position is arbitrary and does not limit the present invention.
[0014]
As shown in FIG. 2, the cooling housing 10 has an upper surface covered by a top plate 5 and generally has an electromagnetic induction coil or a heating coil 12 and a large current for supplying a large current thereto. A semiconductor circuit device 14 such as a series of power modules, a cooling motor 16 for cooling the heating coil 12 and the power module 14 by air, and a cooling fan (also referred to as a blowing unit) 17 are provided. The heating coil 12 is supported by a partition wall 20 via a spring 18, and a gap 22 is formed between the heating coil 12 and the partition wall 20 at regular intervals. The power module 14 is mounted on two wiring boards 15 and is electrically connected to the heating coil 12 (not shown). Further, the cooling motor 16 and the cooling fan 17 are designed to be driven according to the heat generated by the heating coil 12 and the power module 14.
[0015]
The cooling housing 10 has a suction port 24 for taking in air from the outside and a discharge port 26 for discharging air to the outside. As shown in FIG. 2, the partition 20 according to the first embodiment has a plurality of minute openings or jet outlets 30. When the cooling fan 17 rotates, the air taken in from the suction port 24 becomes an air current, flows along the power module 14 and the wiring board 15 as indicated by arrows, and air-cools them. This airflow further forms a jet through the jet outlet 30.
[0016]
Here, the jet refers to a flow of air discharged at a predetermined flow rate from a minute opening such as the jet outlet hole 30. When such a jet impinges on the surface of the heating coil 12 at a substantially right angle, convective heat transfer occurs from the hot surface of the heating coil 12 to a cooler airflow, and is cooled by the impinging jet. The cooling effect (impact jet effect) by the impinging jet generally depends on the flow velocity V of the jet and the collision distance H from the jet outlet 30 to the surface of the heating coil 12, and the flow velocity V depends on the opening area of the jet outlet 30. S and the static pressure P in the cooling housing 10. Therefore, when the static pressure P in the cooling housing 10 is constant, by adjusting the opening area S and the collision distance H, it is possible to obtain a jet having a desired collision jet effect.
[0017]
It is known that the effect of the impinging jet due to the jet is significantly higher than the effect of cooling due to the airflow flowing in parallel along the surface of the heating coil 12. To confirm this, a comparative experiment was performed, and a graph shown in FIG. 3 was obtained. FIG. 3 shows the relationship between the total air volume (ventilation volume) ejected per unit time from the plurality of jet outlets 30 and the heat transfer coefficient due to the impinging jet effect in the cooling housing 10 according to the first embodiment of the present invention. Shown by solid line. At this time, the collision distance H from the jet outlet 30 to the surface of the heating coil 12 was 20 mm, and the jet outlets 30 were formed in a circular shape with a diameter of 15 mm. Similarly, FIG. 3 shows the relationship between the amount of air flowing per unit time from one communication hole 130 and the heat transfer coefficient due to the airflow flowing in parallel along the surface of the heating coil in the conventional cooling housing 110 described above. Is indicated by a broken line. As is clear from FIG. 3, when the total air volume is the same, the heat transfer coefficient when cooling using the jets ejected from the plurality of jet outlets 30 is the heat transfer rate due to the airflow flowing from one communication hole 130. Extremely higher than the rate (easy to exhaust heat). That is, according to the plurality of jet outlets 30 of the present invention, the heat transfer coefficient is higher if the total airflow is constant, and in other words, the same heat transfer coefficient can be obtained with a smaller airflow, as compared with the related art. it can.
[0018]
It has been found that it is necessary to ensure a heat transfer coefficient of about 25 W / m ² K in order to cool the heating coil 12 to a safe temperature in the specification under the standard driving conditions of the electromagnetic cooker 1. Therefore, according to the prior art, an air flow of about 0.03 m ³ / s is required to obtain the above-described heat transfer coefficient, whereas according to the present invention, an air flow of about 0.01 m ³ / s is required. Thus, the total amount of air supplied to the heating coil 12 can be reduced to about 1/3. Since a predetermined heat transfer coefficient can be obtained with about 1/3 of the conventional air flow, the size of the cooling motor 16 and the cooling fan 17 can be reduced, or the number of revolutions can be substantially reduced. Further, the reduction in the number of revolutions makes it possible to extremely reduce noise caused by the cooling motor 16 and the cooling fan 17.
[0019]
The jet outlet 30 rectifies the airflow flowing from left to right in FIGS. 2 and 4A to 4D to form a jet in a direction perpendicular to the surface of the heating coil 12 or the top plate 5. It is preferable to have the rectification unit 32 so as to facilitate the operation. The rectifying section 32 shown in FIG. 4A has an inclined section 32a that tapers uniformly upward, and the rectifying section 32 shown in FIG. It has an inclined portion 32b that tapers uniformly upward and a vertical portion 32c that extends vertically from the central portion. As shown in FIG. 4C, the rectifying section 32 may be a curved section 32d that bends at an arbitrary curvature instead of the inclined section 32b in FIG. 4B. Further, as shown in FIG. 4D, the rectification unit 32 may be an rectification unit 32 having an arbitrary shape that more effectively rectifies an airflow flowing from left to right.
[0020]
Further, each of the jet outlets 30 formed in the partition wall 20 has been described as having a circular shape in plan view as shown in FIG. 5, but is not limited thereto, and may have an elliptical shape or an arbitrary polygonal shape. Has the same effect. Further, the jet outlets 30 may be radially arranged in the radial direction, or may be formed at an arbitrary arrangement position such as a staggered shape. The jet outlets 30 may be arranged according to the shape and heat generation density of the heating coil 12.
[0021]
Embodiment 2 FIG.
Embodiment 2 An electromagnetic cooker according to a second embodiment of the present invention will be described below with reference to FIG. The electromagnetic cooker 1 according to the second embodiment has the same configuration as the first embodiment except that a chamber having an inlet and a plurality of jet outlets is provided instead of the partition wall. The description of the contents to be performed is omitted.
[0022]
6, the chamber 40 of the cooling housing 10 according to the second embodiment supports the heating coil 12 similarly to the partition wall 20 of the cooling housing 10 according to the first embodiment. Further, the chamber 40 has an airflow inlet 42 provided adjacent to the cooling fan 17, and the upper plate 44 of the chamber 40 arranged so as to face the heating coil 12 has the first embodiment. Similarly to the partition wall 20, a plurality of jet outlets 30 are formed.
[0023]
In the electromagnetic cooking device 1 configured as described above, a part of the airflow sent out by the cooling fan 17 flows along the power module 14 and the wiring board 15 and air-cools them. In addition, a part of the airflow is introduced into the inlet 42 of the chamber 40 and is jetted through the plurality of jet outlets 30 to form a jet. Then, as in the first embodiment, the jet collides with the surface of the heating coil 12 to obtain a jet collision effect, and the surface of the heating coil 12 is efficiently cooled.
[0024]
As described above, according to the second embodiment, when a part of the airflow is introduced into the chamber 40, the static pressure P in the chamber 40 increases more than the static pressure P in the cooling housing 10. A jet having a higher flow velocity V than in the first embodiment can be formed. In this way, the electromagnetic cooker 1 having a higher jet collision effect can be configured, so that the size of the cooling motor 16 and the cooling fan 17 can be reduced, or the number of revolutions can be further reduced. Further, since the number of rotations can be suppressed lower, the noise generated by the cooling motor 16 and the cooling fan 17 can be substantially reduced.
[0025]
The jet outlet hole 30 according to the second embodiment may have an arbitrary planar shape similarly to the first embodiment, and may have a rectifying unit 32 as shown in FIG.
[0026]
Since the airflow introduced into the chamber 40 is ejected from the jet outlets 30 arranged from left to right in FIG. 6, the static pressure P in the chamber 40 recovers downstream, and the airflow is introduced. It is lowest near the mouth 42 and gradually increases toward the downstream side. Therefore, when the jet outlets 30 having the same opening area S are formed uniformly, the flow velocity V of the jet jetting out through the jet outlets 30 on the downstream side is higher than the flow velocity V on the upstream side. As described above, when the flow velocity V of the jet flow differs depending on the position where the jet outlet hole 30 is arranged, the expected cooling effect due to the jet collision varies. Therefore, it is preferable that the downstream jet outlet 30 has an opening area S smaller than that of the upstream jet outlet 30 so as to make the jet collision effect uniform over the entire surface of the heating coil 12. Alternatively, it is preferable that the arrangement density of the jet outlets 30 is made coarser on the downstream side than on the upstream side, so that the heating coil 12 is uniformly cooled regardless of the location (position).
[0027]
Embodiment 3 FIG.
Third Embodiment An electromagnetic cooker according to a third embodiment of the present invention will be described below with reference to FIG. The electromagnetic cooker 1 according to the third embodiment differs from the electromagnetic cooker 1 according to the second embodiment in that the inlet is provided adjacent to the cooling fan, but the chamber is provided substantially below the center of the heating coil. Since it has the same configuration except that it is formed on the lower plate, the description of the same content will not be repeated.
[0028]
As shown in FIG. 7, the chamber 40 of the electromagnetic cooker 1 according to the third embodiment supports the heating coil 12 as in the second embodiment. The chamber 40 has an upper plate 44 in which a plurality of jet holes 30 are formed, and a lower plate 46 provided with an inlet 45 communicating with a space in which the power module 14 and the wiring board 15 are arranged. Have. As described above, the inlet 45 of the third embodiment is provided substantially below the center of the heating coil 12 and substantially at the center of the chamber 40.
[0029]
In the cooling housing 10 configured as described above, the air flow sent out by the cooling fan 17 flows along the power module 14 and the wiring board 15 as shown by arrows, and air-cools them. Further, a part of the air flow enters the chamber 40 through the inlet 45 and is jetted through the plurality of jet outlets 30 to form a jet. Thus, similarly to the first embodiment, the jet collides with the surface of the heating coil 12, whereby a jet collision effect is obtained, and the surface of the heating coil 12 is efficiently cooled.
[0030]
In the third embodiment, since the airflow entering the chamber 40 passes through the inlet 45 arranged at a substantially central position thereof, unlike the second embodiment, the static pressure P in the chamber 40 It is formed symmetrically at the center. Thus, the heating coil 12 is preferably cooled symmetrically about its center.
[0031]
Embodiment 4 FIG.
Embodiment 4 of the electromagnetic cooker according to the present invention will be described below with reference to FIGS. 8 and 9. The cooling housing 10 according to the fourth embodiment is different from the third embodiment in that a second chamber for storing a power module and a wiring board is formed in addition to the first chamber for forming a jet. Except for this point, it has the same configuration, and the description of the same content will not be repeated.
[0032]
As shown in FIG. 8, the cooling housing 10 according to the fourth embodiment has a first chamber 40 for forming a jet, and a second housing for storing the power module 14 and the wiring board 15 as in the third embodiment. It has a chamber 50. The first chamber 40 has an upper plate 44 in which a plurality of jet outlets 30 are formed, and a lower plate 46 in which an inlet 45 is formed. The second chamber 50 has a second inlet 52 and communicates with the inlet 45 of the first chamber 40.
[0033]
In summary, the electromagnetic cooker 1 according to the fourth embodiment includes a first chamber 40 having an inlet 45 and a plurality of jet outlets 30, and a heating coil 12 disposed above the first chamber 40. . The electromagnetic cooker 1 further has a second inlet 52, a second chamber 50 that communicates with the inlet 45 of the first chamber 40, and is disposed in the second chamber 50. And a blower such as a cooling fan 17 for sending an airflow to the second inlet 52.
[0034]
In the electromagnetic cooker 1 configured as described above, the airflow sent from the blower fan 17 is introduced from the second inlet 52, flows along the power module 14 and the wiring board 15, and cools them. The airflow introduced into the second chamber 50 enters the inlet 45 of the first chamber 40 without being directly discharged from the outlet 26 of the cooling housing 10, and flows into the jet outlet of the first chamber 40. A jet is formed via 30. Then, the jet collides with the heating coil 12 to cool the heating coil 12 efficiently. That is, the flow path of the airflow in the fourth embodiment is limited to one (one system) flow path that flows through the second chamber 50, the first chamber 40, and the jet outlet 30.
[0035]
In the fourth embodiment, the airflow that cools the heating coil 12 cools the power module 14 and the wiring board 15 in the second chamber 50 before being taken in from the inlet 45 of the first chamber 40. The temperature rises above room temperature, and the cooling effect on the heating coil 12 decreases. However, since the maximum allowable operating temperature of the heating coil 12 is higher than the maximum allowable operating temperature of the power module 14, it is necessary to cool the heating coil 12 to a temperature range in which the heating coil 12 can be operated even when a higher airflow is used. Is possible. In this manner, by integrating the airflow path, both the power module 14 and the heating coil 12 can be cooled with a smaller airflow. Thus, the size of the cooling motor 16 and the cooling fan 17 can be reduced, or the number of rotations can be substantially reduced. The reduction in the number of revolutions makes it possible to extremely reduce noise caused by the cooling motor 16 and the cooling fan 17.
[0036]
In the above description, particularly in FIG. 8, the inlet 45 of the first chamber 40 is provided substantially below the center of the heating coil 12 and substantially at the center of the first chamber 40. Alternatively, however, as shown in FIG. 9, it may be provided at the end of the first chamber 40 located in the opposite direction to the cooling fan 17. Similarly, in the electromagnetic cooker 1 configured as shown in FIG. 9, both the heating coil 12 and the power module 14 can be cooled with a smaller airflow by unifying the flow path of the airflow. Thus, the cooling motor 16 and the cooling fan 17 can be reduced in size, or the number of revolutions can be substantially reduced, and the noise generated by the cooling motor 16 and the cooling fan 17 can be extremely reduced.
[0037]
【The invention's effect】
According to the first aspect of the present invention, since the cooling effect by the impinging jet is much higher than the cooling effect by the airflow flowing parallel to the heating coil, the air flow required to exhaust a certain amount of heat Can be remarkably reduced, and the size of the blower such as the cooling fan and the cooling motor can be reduced, and the noise generated from the blower can be extremely reduced.
[0038]
According to the second aspect of the present invention, the static pressure in the chamber can be made higher than the static pressure in the cooling housing, and a jet having a higher flow velocity can be formed. Thus, the size of the blower can be further reduced, and the noise generated from the blower can be further reduced.
[0039]
According to the third aspect of the present invention, since the static pressure in the chamber is formed symmetrically around the inlet, the heating coil can be cooled symmetrically with respect to the center of the heating coil. .
[0040]
According to the fourth aspect of the present invention, the upstream jet outlet has an opening area smaller than that of the downstream jet outlet, or the arrangement density of the jet outlet is lower in the downstream than the upstream. By making it rough, the heating coil can be cooled uniformly regardless of the position.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an electromagnetic cooker.
FIG. 2 is a cross-sectional view of the cooling housing of the electromagnetic cooker according to the first embodiment of the present invention, taken along line II-II of FIG.
FIG. 3 is a graph for comparing the cooling effects of the jet outlet according to the first embodiment and the conventional communication holes.
FIG. 4 is a cross-sectional view showing a rectifying portion of a jet outlet.
FIG. 5 is a plan view showing a plane shape of a jet outlet provided in a partition wall and an arrangement position with respect to a heating coil.
FIG. 6 is a sectional view similar to FIG. 2, showing a cooling housing of an electromagnetic cooker according to Embodiment 2 of the present invention.
FIG. 7 is a sectional view similar to FIG. 2, showing a cooling housing of an electromagnetic cooker according to Embodiment 3 of the present invention.
FIG. 8 is a sectional view similar to FIG. 2, showing a cooling housing of an electromagnetic cooker according to Embodiment 4 of the present invention.
FIG. 9 is a sectional view similar to FIG. 2, showing a cooling housing of an alternative electromagnetic cooker according to the fourth embodiment.
FIG. 10 is a sectional view showing a cooling housing of the conventional electromagnetic cooker, taken along the line II-II in FIG. 1;
[Explanation of symbols]
REFERENCE SIGNS LIST 1 electromagnetic cooker, 5 top plate, 6 grill, 7 dial-type heating power adjuster, 8 display, 10 cooling housing (housing), 12 heating coil, 14 semiconductor circuit device, 15 wiring board, 16 cooling motor, 17 Cooling fan, 18 spring, 20 partition, 22 gap, 24 inlet, 26 outlet, 30 jet outlet, 32 rectifier, 40 first chamber, 42 inlet, 44 upper plate, 45 inlet, 46 lower plate , 50 second chamber, 52 second inlet.

Claims (4)

An electromagnetic cooker,
A housing having an inlet and an outlet,
Blower,
A partition having a plurality of jet outlets,
A heating coil arranged above the partition,
A circuit section for supplying a current to the heating coil,
The blower, the partition, the heating coil, and the circuit are disposed in the housing,
The airflow sent from the blower passes along the circuit part, forms a jet through the jet outlet of the partition wall, and the heating coil is cooled by the collision of the jet with the heating coil. And an electromagnetic cooker. An electromagnetic cooker,
A housing having an inlet and an outlet,
Blower,
A chamber having an inlet and a plurality of jet outlets;
A heating coil located above the chamber;
A circuit section for supplying a current to the heating coil,
The blower, the chamber, the heating coil, and the circuit are arranged in the housing,
The air flow sent from the blower passes along the circuit part, is introduced into the inlet of the chamber, forms a jet through the jet outlet, and the jet collides with the heating coil, thereby cooling the heating coil. An electromagnetic cooker characterized by being performed. It is an electromagnetic cooker according to claim 2,
An electromagnetic cooker, wherein the inlet of the chamber is disposed almost immediately below the center of the heating coil. The electromagnetic cooker according to any one of claims 1 to 3, wherein
An electromagnetic cooker, wherein the plurality of jet outlets have a size and a configuration such that the jet uniformly removes heat generated from the heating coil.

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