JP2015159101A - electromagnetic cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic cooker capable of preventing a magnetic flux generated from a heating coil from being leaked to the outside of a main body part.SOLUTION: An electromagnetic cooker 1 comprises: a heating coil 27 provided in a box-like main body part 3; a magnetic flux leakage prevention part 51 arranged between a bottom part 3a of the main body part 3 and the heating coil 27, and formed of a non-magnetic metal material to prevent a magnetic flux generated from the heating coil 27 from being leaked to the outside of the main body part 3; and a gap part 55 provided between the magnetic flux leakage prevention part 51 and the heating coil 27 and having a width of 3 mm or more and 35 mm or less.

Description

  The present invention relates to an electromagnetic cooker that cooks food by induction heating a food pan.

  A concentric induction heating coil (hereinafter abbreviated as “heating coil”) is installed below the top plate made of crystallized glass, etc., and a high-frequency current is passed through the heating coil to generate a magnetic field on the top plate. There is known an induction heating cooker that induces an eddy current at the bottom of a cooking vessel placed and directly heats the cooking vessel with this Joule heat (for example, Patent Documents 1 and 2).

  The magnetic field generated from the heating coil by flowing a high-frequency current may cause the control circuit to malfunction, or the magnetic flux generated from the heating coil may be linked to this floor surface depending on the material of the floor surface where the induction heating cooker is placed during use. The floor of the lever may generate heat. For this reason, the induction heating cooker described in Patent Document 1 is configured to shield the magnetic flux generated from the heating coil from leaking downward by providing a conductive metal plate below the heating coil. In addition, the induction heating cooker described in Patent Document 2 provides a magnetic body and a conductive shielding plate below the heating coil, thereby converging the magnetic flux generated from the heating coil to the magnetic body, The leakage flux is shielded by a conductive shielding plate so that the leakage flux that is not converged does not interlink with the floor surface.

JP-A-62-2288 JP-A-5-315067

  However, since a desktop induction heating cooker cannot secure a sufficient distance between the floor surface and the heating coil, a conductive shielding plate that shields the magnetic flux generated from the heating coil is simply provided below the heating coil. However, there is a problem that the leakage of magnetic flux cannot be sufficiently shielded.

  The objective of this invention is providing the electromagnetic cooker which can prevent that the magnetic flux which generate | occur | produces from a heating coil leaks outside the main-body part.

  In order to solve the above problems, an electromagnetic cooker according to an aspect of the present invention is disposed between a heating coil provided inside a box-shaped main body, a bottom of the main body, and the heating coil. A magnetic flux leakage prevention portion that is formed of a non-magnetic metal material and prevents the magnetic flux generated from the heating coil from leaking outside the main body, and is provided between the magnetic flux leakage prevention portion and the heating coil. Exhaust air having a width of 3 mm or more and 35 mm or less, an intake port formed in the bottom portion, and formed in the main body unit, and exhausting air taken in from the intake port to the outside of the main body unit The magnetic flux leakage prevention part is disposed between the intake port and the exhaust port, and the magnetic flux leakage prevention part is disposed on the bottom portion from a region where the intake port is disposed. It is characterized by having a step that lowers the area. Characterized by a.

  The magnetic flux leakage prevention part may be formed to a thickness of 0.3 mm or more and 1 mm or less.

  The magnetic flux leakage prevention unit may have an outer shape that follows the outer shape of the heating coil.

  The magnetic flux leakage prevention unit may be arranged vertically below the heating coil.

  In the electromagnetic cooker according to the above aspect, a magnetic path forming unit that is formed of a magnetic material and forms a part of a magnetic path through which the magnetic flux generated from the heating coil passes between the heating coil and the magnetic flux leakage prevention unit. May further be included.

  The main body may have a thickness of 40 mm.

  According to the present invention, the magnetic flux generated from the heating coil can be prevented from leaking outside the main body.

1 is an external perspective view of an electromagnetic cooker 1 according to a first embodiment of the present invention. It is a bottom view of the electromagnetic cooker 1 by the 1st Embodiment of this invention. It is a perspective view which shows the internal structure of the electromagnetic cooker 1 which removed the top plate 5 of the electromagnetic cooker 1 by the 1st Embodiment of this invention, and was seen. It is a perspective view which shows the internal structure of the electromagnetic cooker 1 which removed the heating coil 27 of the electromagnetic cooker 1 by the 1st Embodiment of this invention, and was seen. It is a perspective view which shows the internal structure of the electromagnetic cooker 1 which removed and looked at the power circuit part 37 of the electromagnetic cooker 1 by the 1st Embodiment of this invention. It is a section perspective view of electromagnetic cooker 1 by a 1st embodiment of the present invention. It is a perspective view of the state where the electromagnetic cooker 1 by a 1st embodiment of the present invention was cut. It is an external appearance perspective view of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a bottom view of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a left view of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a right view of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a rear view of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a perspective view which shows the internal structure of the electromagnetic cooker 101 which removed and looked at the top plate 105 of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a perspective view of the state where the electromagnetic cooker 101 by the 2nd Embodiment of the present invention was cut. It is sectional drawing of the electromagnetic cooker 101 by the 2nd Embodiment of this invention. It is a bottom view of the electromagnetic cooker 301 by the modification of the 1st Embodiment of this invention. It is the electromagnetic cooker 301 by the modification of the 1st Embodiment of this invention, Comprising: It is an enlarged view of the 2nd inlet 311 vicinity. It is the electromagnetic cooker 401 by the other modification by the 1st Embodiment of this invention, Comprising: It is a top view of the electromagnetic cooker 401 which removed the top plate and was seen.

[First Embodiment]
The electromagnetic cooking device by the 1st Embodiment of this invention is demonstrated using FIGS. 1-5. FIG. 1 is an external perspective view of the electromagnetic cooking device 1 according to the present embodiment. FIG. 2 is a bottom view of the electromagnetic cooking device 1.
As shown in FIG.1 and FIG.2, the electromagnetic cooker 1 is a tabletop type electromagnetic cooker used on a table or the like. The electromagnetic cooker 1 has a rectangular thin plate-like appearance. The electromagnetic cooker 1 is a thin electromagnetic cooker. The electromagnetic cooker 1 is a high output (for example, 1400 W) electromagnetic cooker.

  As shown in FIG. 1, the electromagnetic cooking device 1 includes a box-shaped main body 3 and a top plate 5 disposed on the main body 3 so as to close an opening (not shown) of the main body 3. Yes. The top plate 5 has a thin plate shape and is made of crystallized glass or the like. On the top plate 5 on the front side of the electromagnetic cooker 1, an operation panel 5b operated by the user of the electromagnetic cooker 1, such as a power switch for turning on the electromagnetic cooker 1 and a temperature adjustment switch, is provided. Yes. Note that the operation panel 5 b may be provided on the side surface of the main body 3. A circular pan bottom arrangement portion 5a is provided on almost the entire surface of the top plate 5 excluding the operation panel 5b. A heating coil 27, which will be described later, is provided inside the main body 3 and below the pan bottom arrangement portion 5a. The electromagnetic cooker 1 suggests to the user a place where the magnetic field generated by the heating coil 27 can be applied to the pan bottom most efficiently by providing the pan bottom arrangement portion 5 a on the top plate 5. A power cord 7 is connected to the back side. The main body 3 has a thickness of 40 mm.

  As shown in FIG. 2, legs 3 b are provided at corners of the outer surface of the bottom 3 a of the main body 3. The leg 3b is formed so as to protrude from the outer surface of the bottom 3a. The leg 3b has a truncated cone shape that narrows from the bottom 3a side toward the tip side. The electromagnetic cooking device 1 has leg portions 3b, thereby preventing the bottom portion 3a and the top plate of the table on which the electromagnetic cooking device 1 is placed from coming into direct contact.

The electromagnetic cooker 1 includes a first air inlet 9 formed on the front side of the center of the outer surface of the bottom 3 a of the main body 3, and a second air inlet formed on the bottom 3 a side by side with the first air inlet 9. And the intake port 11. The first intake port 9 and the second intake port 11 have the same shape.
Here, the structure of the first and second intake ports 9 and 11 will be described by taking the first intake port 9 as an example. The first intake port 9 has a flat dish shape (petriform shape) and is formed to project downward from the bottom 3a. The first intake port 9 includes a plurality of concentric circular portions 9 a formed concentrically, and a plurality of radial portions extending radially from the innermost concentric circular portion 9 a toward the outer peripheral side of the first intake port 9. 9b. The plurality of concentric circular portions 9a are disposed with a predetermined gap therebetween, and the plurality of radial portions 9b are disposed with a predetermined gap therebetween. For this reason, the area | region enclosed by the adjacent concentric circle part 9a and the adjacent radial part 9b becomes a communicating port which connects the internal space of the main-body part 3 and the external space where the electromagnetic cooker 1 is arrange | positioned. Similarly, the space surrounded by the innermost concentric circle portion 9a is also a communication port. The ambient air is sucked into the internal space of the main body 3 through the communication port formed in the first air inlet 9. Moreover, the 1st inlet port 9 has the thin-plate leg part 9c each provided in the three radial parts 9b among the some radial parts 9b. The thin plate leg portion 9c is formed to be higher than the height of the concentric circle portion 9a and the radial portion 9b. The thin plate leg 9c is formed at substantially the same height as the leg 3b. By making the heights of the thin plate leg portion 9c, the concentric circular portion 9a, and the radial portion 9b different from each other, foreign matters such as paper stick to the surface of the first air inlet 9 during operation of the first blower 17 described later. It comes to prevent.

On the back side of the main body 3, there is formed an exhaust port 13 through which the air sucked from the first and second intake ports 9, 11 and exhausted through the inside of the main body 3 is discharged to the outside. The exhaust port 13 has a slit shape in which a plurality of rectangular openings are formed side by side. The exhaust port 13 is formed in the back side surface of the main-body part 3, and the left side surface and right side surface near the back side surface, respectively. The “left side surface” is a side surface positioned on the left side when viewed from the front side, and the “right side surface” is a side surface positioned on the right side when viewed from the front side.
Further, a cord insertion port 15 into which the power cord 7 is inserted is provided on the right side of the rear side surface of the electromagnetic cooker 1 and on the right side of the exhaust port 13. The cord insertion port 15 is a magnet type insertion port.

Next, the internal structure of the electromagnetic cooker 1 will be described with reference to FIGS. FIG. 3 is a perspective view showing the internal structure of the electromagnetic cooker 1 with the top plate 5 removed. FIG. 4 is a perspective view showing the internal structure of the electromagnetic cooker 1 with the heating coil 27 removed. FIG. 5 is a perspective view showing the internal structure of the electromagnetic cooker 1 viewed with the power supply circuit unit 37 removed.
As shown in FIG. 3, the electromagnetic cooker 1 is generated from a heating coil 27 provided inside the box-shaped main body 3 and a semiconductor element for power control (not shown) provided inside the main body 3. A heat dissipating part 25 for dissipating the heat, a rotating shaft 17a orthogonal to the bottom 3a, a first blower 17 disposed above the first air inlet 9, and a rotating shaft 19a orthogonal to the bottom 3a. And a second blower 19 disposed above the second air inlet 11. The power supply control semiconductor element controls the start and stop of current supply to the heating coil 27 and the current value of the high-frequency current flowing through the heating coil 27 based on the operation of the operation panel 5b by the user. It is an element. The heating coil 27, the first blower 17, and the second blower 19 are disposed so as not to overlap each other in plan view. The first and second air inlets 9 and 11 are formed around the heating coil 27.

  A control circuit unit 35 is disposed on the front side of the main body unit 3. The control circuit unit 35 controls power-on and temperature adjustment based on the operation of the operation panel 5b (see FIG. 1) by the user.

  The heating coil 27 is disposed substantially at the center of the bottom 3a. The heating coil 27 communicates with the first intake port 9 and the exhaust port 13 and is disposed in a first circulation part 39 through which air blown by the first blower 17 circulates. The heating coil 27 has a conducting wire portion (not shown) through which a high-frequency current flows, and a conducting wire fixing portion 27a that winds and fixes the conducting wire portion. The conducting wire fixing portion 27a includes an annular central portion 27a-1 disposed at the center, an outer peripheral portion 27a-2 disposed concentrically around the central portion 27a-1, and an outer peripheral portion from the central portion 27a-1. 27a-2 and a plurality of (in this example, eight) wiring portions 27a-3 which are arranged in a radial manner and are formed with a plurality of groove portions for wiring the conductive wires.

  On the left side of the heating coil 27, the heat radiating portion 25 is disposed. The heat radiating part 25 communicates with the second air inlet 11 and the air outlet 13 and is disposed in the second circulation part 41 through which the air blown by the second blower 19 circulates. The heat radiation part 25 has a heat sink provided with a plurality of fins 25a extending in a direction in which the air blown by the second blower 19 flows. The heat radiating portion 25 is thermally connected to the power control semiconductor element, and radiates heat generated from the power control semiconductor element and conducted by heat conduction from the fins 25a.

  The first blower 17 and the second blower 19 are disposed on the front side of the heating coil 27. The first blower 17 is disposed on the right side, and the second blower 19 is disposed on the left side. The first and second blowers 17 and 19 are controlled to rotate synchronously. The rotation speeds of the first and second blowers 17 and 19 are controlled to be the same. Thereby, it is possible to prevent a beat from occurring due to the rotation of the first blower 17 and the second blower 19. The first and second blowers 17 and 19 are centrifugal blowers. For this reason, the 1st blower 17 arrange | positioned just above the 1st inlet 9 blows the air suck | inhaled into the inside of the main-body part 3 through the 1st inlet 9 in the direction which the bottom part 3a spreads. Can do. Similarly, the 2nd air blower 19 arrange | positioned just above the 2nd inlet 11 blows the air suck | inhaled into the inside of the main-body part 3 through the 2nd inlet 11 in the direction which the bottom part 3a spreads. Can do.

  The electromagnetic cooker 1 opens the heating coil 27 side and is arranged around the first blower 17 to form a first air passage 29 that guides the air blown by the first blower 17 to the heating coil 27. A first air passage wall 21 is provided. The first air passage wall 21 is disposed along the outer peripheral shape of the first blower 17. The first air passage 29 constitutes the upstream side of the first circulation part 39. The first blower 17 sucks the air sucked into the main body 3 through the first air inlet 9 from the direction of the rotating shaft 17a and blows it in the centrifugal direction by the first blower 17. For this reason, the 1st air blower 17 will also blow in the direction where the heating coil 27 is not arrange | positioned, and the cooling efficiency of the heating coil 27 will become low. Therefore, in the present embodiment, the first air passage wall 21 having the heating coil 27 side opened is provided around the first blower 17 to block the air toward the direction in which the heating coil 27 is not disposed, It leads to the opening side. Thus, the first air passage wall 21 can guide almost all of the air sucked from the direction of the rotation shaft 17 a of the first blower 17 and blown in the centrifugal direction to the first air passage 29. One end of the first air passage wall 21 is formed to extend from the periphery of the first blower 17 to the second air passage wall 23 along the periphery of the heating coil 27. The other end of the first air passage wall 21 extends in the direction opposite to the one end of the first air passage wall 21 and is formed along the periphery of the heating coil 27 to the vicinity of the power supply circuit portion 37. Thereby, the electromagnetic cooker 1 can guide almost all the air blown from the first blower 17 to the first air passage 29 and discharge it onto the heating coil 27.

  A flow of wind from the first intake port 9 toward the exhaust port 13 is formed in the first circulation part 39 by the air blown by the first blower 17. Therefore, the air that enters the heating coil 27 from the first air passage 29 cools the air in the first circulation part 39 that is warmed by the heat generated by the heating coil 27 when passing over the heating coil 27. The air is exhausted from the exhaust port 13 to the outside of the main body 3 in a state where heat is taken from the first flow part 29. Thereby, the temperature in the 1st distribution part 39 falls.

  The electromagnetic cooker 1 is disposed around the second blower 19 by opening the heat radiating unit 25 side, and forms a second air passage 31 that guides the air blown by the second blower 19 to the heat radiating unit 25. A second air passage wall 23 is provided. The second air passage wall 23 is disposed along the outer peripheral shape of the second blower 19. The second air passage 31 constitutes the upstream side of the second circulation part 41. The second blower 19 blows the air sucked into the main body 3 through the second intake port 11 in the direction of 360 ° around the rotation shaft 19a. For this reason, the 2nd air blower 19 ventilates also in the direction where the thermal radiation part 25 is not arrange | positioned, and the heat conversion efficiency in the thermal radiation part 25 will become low. Therefore, in the present embodiment, a second air passage wall 23 having an opening on the side of the heat radiating portion 25 is provided around the second blower 19 to block the air toward the direction in which the heat radiating portion 25 is not disposed, It leads to the opening side. Thus, the second air passage wall 23 can guide almost all of the air blown from the second blower 19 in the direction of 360 ° around the rotation shaft 19 a to the second air passage 31. Both end portions of the second air passage wall 23 are formed to extend to the vicinity of the end portion of the heat radiating portion 25. Thereby, the electromagnetic cooker 1 can guide almost all the air blown from the second blower 19 to the second air passage 31 and can be discharged onto the heat radiating portion 25.

  A flow of wind from the second air inlet 11 toward the air outlet 13 is formed in the second circulation part 41 by the air blown by the second blower 19. Furthermore, since the plurality of fins 25a are formed to extend in the direction in which the air blown by the second blower 19 circulates, the heat dissipating part 25 does not hinder the flow of the air and between the plurality of fins 25a. The air blown from the second blower 19 can be circulated. For this reason, the air that enters the heat radiating portion 25 from the second air passage 31 passes through the heat radiating portion 25 heated by the heat conducted by the power control semiconductor element, that is, between the plurality of fins 25a. Cool 25. Further, the air that enters the heat radiating portion 25 from the second air passage 31 is quickly removed from the exhaust port 13 to the outside of the main body portion 3 without staying between the plurality of fins 25 a in a state where heat is taken from the heat radiating portion 25. Exhausted. Thereby, the temperature in the 2nd distribution part 41 falls efficiently.

As shown in FIG. 4, the power supply circuit unit 37 receives a high-frequency current or other predetermined power supply voltage that flows from the commercial power supply supplied via the power cord 7 and the cord insertion port 15 to the conducting wire portion of the heating coil 27. A circuit component group 37a to be generated is provided in the vicinity of the exhaust port 13. Although the temperature in the vicinity of the circuit component group 37a rises due to the heat generated by the circuit component group 37a, the circuit component group 37a is disposed in the vicinity of the exhaust port 13, so that the air that has passed through the first and second circulation portions 39 and 41 is provided. At the same time, air in the vicinity of the circuit component group 37 a is also exhausted from the exhaust port 13. Thereby, the electromagnetic cooker 1 can prevent the temperature inside the main body 3 from rising due to the heat generated by the power supply circuit unit 37.
Thus, even if the internal space of the main body 3 in which the heating coil 27 is arranged is narrow, the electromagnetic cooker 1 can prevent a temperature rise in the internal space of the main body 3 due to heat generated by the heating coil 27.

  As described above, the electromagnetic cooker 1 causes the first blower 17 to generate an air flow from the first intake port 9 toward the exhaust port 13 and distributes it to the first distribution unit 39 formed inside the main body 3. Can be made. Moreover, the electromagnetic cooker 1 causes the second blower 19 to generate an air flow from the second intake port 11 toward the exhaust port 13 and distribute the air flow to the second distribution unit 41 formed inside the main body unit 3. Can do. Thereby, the heat generated in the heating coil 27 is directly exhausted from the exhaust port 13 to the outside of the main body 3 by the airflow flowing through the first circulation portion 39, and by the airflow flowing through the second circulation portion 41. The air is indirectly exhausted from the exhaust port 13 to the outside of the main body 3 through the heat radiating unit 25. Further, the heat generated in the power supply circuit unit 37 is also exhausted to the outside of the main body unit 3 by the airflow flowing through the first and second circulation units 39 and 41. Thereby, the electromagnetic cooker 1 can efficiently exhaust the heat generated by the heating coil 27 to the outside of the main body 3 to prevent the temperature inside the main body 3 from rising.

  As shown in FIGS. 4 to 5, the electromagnetic cooking device 1 is formed to protrude from the bottom 3 a toward the inside of the main body 3, and to prevent foreign matters from entering the inside of the main body 3 from the exhaust port 13. An intrusion prevention unit 33 is provided. The foreign matter entry prevention unit 33 is disposed between the exhaust port 13 and the power supply circuit unit 37. The foreign matter intrusion prevention unit 33 is formed to be higher than the height of the circuit component group 37 a of the power supply circuit unit 37. The foreign matter entry prevention unit 33 is configured to prevent foreign matter entering from the exhaust port 13 from entering the inside of the main body 3. The foreign matter includes, for example, a metal object such as a knife or fork and moisture such as water.

  As shown in FIGS. 4 and 5, the foreign matter entry prevention unit 33 includes an upper region 33 a higher than the mounting surface on which the circuit component group 37 a of the power supply circuit unit 37 is mounted, and a lower region 33 b lower than the mounting surface. have. The upper region 33a and the lower region 33b are formed integrally, for example. Since the upper region 33a is disposed on the front surface of the circuit component group 37a, for example, a metal foreign object that has entered from the exhaust port 13 during use of the electromagnetic cooker 1 comes into contact with the circuit component group 37a and the power supply circuit unit 37. Can prevent short circuit failure. On the other hand, the lower region 33 b is located at a position lower than the mounting surface of the power supply circuit unit 37. For this reason, the lower region 33 b can prevent foreign matter such as water entering from the exhaust port 13 from entering the inside of the main body 3.

  Further, the foreign matter entry prevention unit 33 includes a passage portion 33c through which air that has circulated through the first and second circulation portions 39 and 41 passes to the exhaust port 13 side. The passage portion 33 c is formed by cutting out at least a part of the upper region 33 a of the foreign matter entry prevention portion 33. Since the foreign matter entry preventing portion 33 has the passage portion 33 c, the foreign matter entry preventing portion 33 does not prevent the air inside the main body portion 3 from being exhausted to the outside through the exhaust port 13. In the present embodiment, a plurality of foreign matter entry prevention units 33 are provided. In addition, the shapes of the plurality of foreign matter intrusion prevention units 33 do not have to be the same. The foreign matter entry prevention unit 33 may have only the lower region 33b, such as the foreign matter entry prevention unit 33 provided on the left side of the cord insertion port 15, for example.

Next, a magnetic flux leakage prevention unit that prevents the magnetic flux generated in the heating coil 27 from leaking to the outside will be described with reference to FIGS. 6 and 7 with reference to FIGS. FIG. 6 is a perspective view showing a state in which the electromagnetic cooking device 1 is cut in parallel with the left side surface and the right side surface through the central axis of the heating coil 27. FIG. 7 is a cross-sectional view of the electromagnetic cooker 1 when the cut state of the electromagnetic cooker 1 shown in FIG. 6 is viewed in the normal direction of the left side surface of the heating coil 27.
As shown in FIGS. 4 and 6, the electromagnetic cooker 1 is disposed between the bottom 3 a of the main body 3 and the heating coil 27, is formed of a nonmagnetic metal material, and is generated from the heating coil 27. Has a magnetic flux leakage prevention portion 51 for preventing leakage of the magnetic flux to the outside of the main body portion 3. The magnetic flux leakage prevention unit 51 is disposed vertically below the heating coil 27. The magnetic flux leakage prevention unit 51 is formed of a material other than the material that forms the cooking container to be heated placed on the top plate 5. The magnetic flux leakage prevention unit 51 is made of, for example, aluminum. The magnetic flux leakage prevention part 51 is formed with a thickness of 0.3 mm or more and 1 mm or less, for example. In the present embodiment, the magnetic flux leakage prevention unit 51 is formed with a thickness of 0.6 mm, for example. The magnetic flux leakage prevention unit 51 has an outer shape that follows the outer shape of the heating coil 27. In this embodiment, the magnetic flux leakage prevention part 51 has a circular outer shape. Therefore, the magnetic flux leakage prevention part 51 has a thin disk shape. The magnetic flux leakage prevention part 51 has a diameter that is substantially the same as the inner diameter of the outer peripheral part 27 a-1 of the heating coil 27. Since the magnetic flux leakage prevention part 51 is disposed in the first flow part 39, a temperature rise due to radiant heat from the heating coil 27 is prevented. As shown in FIG. 5, the magnetic flux leakage prevention unit 51 is provided with a through hole 51 a for fixing the power supply circuit unit 37.

  A gap 53 of 3 mm or more and 35 mm or less is provided between the magnetic flux leakage prevention unit 51 and the heating coil 27. That is, the lower limit value of the width of the gap 53 is 3 mm, and the upper limit value is 35 mm. As shown in FIG. 7, the width L1 of the gap 53 is, for example, the distance between the surface of the magnetic flux leakage prevention part 51 and the bottom of the groove part of the wiring part 27a-3 of the conducting wire fixing part 27a. The surface of the magnetic flux leakage prevention unit 51 is a surface where the magnetic flux leakage prevention unit 51 faces the heating coil 27. The bottom part of the groove part of the wiring part 27a-3 is a part in contact with the conductor part located closest to the magnetic flux leakage prevention part 51 in the depth direction of the groove part when the conductor part is wired in the groove part. A region sandwiched between the surface of the magnetic flux leakage prevention portion 51 and a plane that includes the bottom of the groove portion of the wiring portion 27a-3 and faces the surface of the magnetic flux leakage prevention portion 51 is the gap portion 53.

  In the gap portion 53, a power supply circuit portion 37 and a magnetic path forming portion 55 are disposed. The magnetic path forming part 55 is made of a magnetic material, and forms a part of a magnetic path through which the magnetic flux generated from the heating coil 27 passes. The magnetic path forming portion 55 is disposed inside the conducting wire fixing portion 27a. Magnetic flux generated by flowing a high-frequency current through the heating coil 27 is linked to the bottom of the cooking container to be heated above the top plate 5. Thereby, an eddy current is induced at the bottom of the cooking container and Joule heat is generated. Thus, the cooking container is directly induction heated by the magnetic flux generated from the heating coil 27. On the other hand, the magnetic flux generated by applying a high-frequency current to the heating coil 27 is almost converged on the magnetic path forming portion 55 below the heating coil 27. Thereby, it can prevent that the magnetic flux which generate | occur | produces with the heating coil 27 links with the top plate of the table where the electromagnetic cooker 1 is set | placed. However, all of the magnetic flux generated by the heating coil 27 is not converged on the magnetic path forming portion 55, and a part of this magnetic flux leaks from the magnetic path forming portion 55 and becomes a leakage magnetic flux. However, the magnetic flux leakage prevention part 51 is arranged above the bottom part 3 a of the main body part 3 and below the magnetic path forming part 55. Since the magnetic flux leakage prevention unit 51 shields the leakage magnetic flux, the leakage magnetic flux does not leak outside the electromagnetic cooker 1. For this reason, even if the top plate of the table on which the electromagnetic cooker 1 is placed at the time of use is formed of a material that is induction-heated, the top plate is prevented from being induction-heated by the electromagnetic cooker 1. .

  In the electromagnetic cooker 1, the heating coil 27 is arranged so that the cooking container to be heated placed on the top plate 5 is induction-heated most efficiently. For this reason, the distance between the cooking container to be heated and the heating coil 27 is the distance at which the magnetic flux generated by the heating coil 27 is interlinked most efficiently with the cooking container to be heated. Further, the magnetic flux density of the magnetic flux generated from the heating coil 27 decreases as the distance from the heating coil 27 increases. For this reason, if the cooking container to be heated is lifted above the top plate 5 while the electromagnetic cooker 1 is in an operating state, the magnetic flux interlinking with the cooking container gradually decreases, and the cooking container to be heated When the distance from the heating coil 27 exceeds a predetermined value, the cooking container is not induction heated. The leakage magnetic flux generated below the heating coil 27 is smaller than the magnetic flux generated above the heating coil 27 by the amount of the magnetic path forming portion 55 provided in the heating coil 27. For this reason, even when a high permeability metal plate is used for the table top, the distance between the table top on which the electromagnetic cooker 1 is placed and the heating coil 27 is equal to or greater than the predetermined value described above. If so, the table top is not induction heated by the magnetic flux generated from the heating coil 27.

  Therefore, in the present embodiment, the range of the width L1 of the gap 55 is set so as to include the distance between the cooking container to be heated and the heating coil 27. The lower limit value of the width L 1 of the gap 55 is set to the distance from the upper surface of the heating coil 27 to the upper surface of the top plate 5. Here, the upper surface of the heating coil 27 is a facing surface where the heating coil 27 faces the top plate 5. The top surface of the top plate 5 is the back surface of the facing surface where the top plate 5 faces the top surface of the heating coil 27, that is, the surface of the pan bottom arrangement portion 5 a in contact with the outside. Further, the upper limit value of the width L1 of the gap 55 is set to the above-described predetermined value. The width L1 of the gap, that is, the distance between the magnetic flux leakage prevention unit 51 and the heating coil 27 is always shorter than the distance between the top plate of the table on which the electromagnetic cooking device 1 is placed and the heating coil 27. For this reason, by setting the width L1 of the gap 53 to the above-described predetermined value, the distance between the magnetic flux leakage prevention unit 51 and the top of the table becomes a margin that makes it difficult to induction heat the top. In the present embodiment, the distance between the cooking container to be heated and the heating coil 27 is, for example, 7.5 mm, the predetermined value is, for example, 35 mm, and the width L1 of the gap 53 is, for example, 22 mm.

  When the electromagnetic cooker 1 is a thin electromagnetic cooker, and the width L1 of the gap 53 cannot be sufficiently secured with respect to the magnitude of the magnetic flux generated from the heating coil 27, the magnetic flux leakage prevention unit 51 Increase the thickness. When the thickness of the magnetic flux leakage prevention unit 51 is increased, the magnetic flux does not easily pass through the leakage prevention unit 51 even if the magnitude of the magnetic flux is the same, so that the leakage magnetic flux shielding effect of the leakage prevention unit 51 is enhanced.

  As described above, the electromagnetic cooker 1 according to the present embodiment has the width L1 of the gap 53, that is, the magnetic flux leakage prevention unit 51 and the heating coil, based on the distance between the cooking container to be heated and the heating coil 27. 27 is set. Thereby, even if the thickness of the main-body part 3 becomes thin like 40 mm or less and the distance between the heating coil 27 and the top plate of a table becomes short, the electromagnetic cooker 1 by this embodiment is a heating coil. Can be more effectively prevented from leaking to the outside of the main body 3. As a result, even if the top plate of the table on which the electromagnetic cooking device 1 is placed, for example, is made of a metal material with high permeability, the magnetic flux generated from the heating coil 27 is shielded by the magnetic flux leakage prevention unit 51 and is thus removed. Do not link with the board. Thereby, the temperature rise of the top plate of the table is prevented when the electromagnetic cooker 1 is used.

[Second Embodiment]
An electromagnetic cooker according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is an external perspective view of the electromagnetic cooking device 101 according to the present embodiment. FIG. 7 is a bottom view of the electromagnetic cooking device 101. FIG. 8 is a left side view of the electromagnetic cooking device 101. FIG. 9 is a right side view of the electromagnetic cooking device 101. FIG. 10 is a rear view of the electromagnetic cooking device 101. The “left side surface” is a side surface positioned on the left side when viewed from the front side, and the “right side surface” is a side surface positioned on the right side when viewed from the front side.
As shown in FIGS. 6 to 10, the electromagnetic cooker 101 is a desktop type electromagnetic cooker that is used on a table or the like. The electromagnetic cooker 101 has a rectangular thin plate-like appearance. The electromagnetic cooker 101 is a thin electromagnetic cooker. The electromagnetic cooker 101 is an electromagnetic cooker having a lower output (for example, 1000 W) than the electromagnetic cooker 1 according to the first embodiment.

  As shown in FIG. 6, the electromagnetic cooker 101 includes a box-shaped main body 103 and a top plate 105 disposed on the main body 103 so as to close an opening (not shown) of the main body 103. Yes. The top plate 105 has a thin plate shape and is made of crystallized glass or the like. On the top plate 105 on the front side of the electromagnetic cooker 101, an operation panel 105b operated by a user of the electromagnetic cooker 101 such as a power switch and a temperature adjustment switch for turning on the electromagnetic cooker 101 is provided. Yes. A circular pan bottom arrangement portion 105a is provided on almost the entire surface of the top plate 105 excluding the operation panel 105b. A heating coil 127, which will be described later, is provided inside the main body 103 and below the pan bottom arrangement portion 105a. The electromagnetic cooker 101 suggests to the user a place where the magnetic field generated by the heating coil 127 can be applied to the pan bottom most efficiently by providing the pan bottom arrangement portion 105a on the top plate 105.

  As shown in FIG. 7, leg portions 103 b are provided at corners on the outer surface of the bottom portion 103 a of the main body portion 103. The leg portion 103b is formed to protrude from the outer surface of the bottom portion 103a. The leg portion 103b has a truncated cone shape that becomes narrower from the bottom 103a side toward the distal end side. The electromagnetic cooking device 101 has the leg portion 103b, thereby preventing the bottom portion 103a and the top plate of the table on which the electromagnetic cooking device 101 is placed from coming into direct contact with each other.

  The electromagnetic cooker 101 has an intake port 109 formed on the left side on the front side of the center of the outer surface of the bottom 103a of the main body 103. The intake port 109 has the same configuration as the first intake port 9 in the first embodiment. The air intake port 109 has a flat dish shape (a petri dish shape), and is formed to protrude downward from the bottom portion 103a. The intake port 109 includes a plurality of concentric circular portions 109a having the same configuration as the plurality of concentric circular portions 9a of the first intake port 9, a plurality of radial portions 109b having the same configuration as the plurality of radial portions 9b, It has three thin plate legs 109c having the same configuration as the three thin plate legs 9c. The region surrounded by the adjacent concentric circular portions 109a and the adjacent radial portions 109b and the space surrounded by the innermost concentric circular portions 109a are the internal space of the main body 103 and the electromagnetic cooker 101. It becomes a communication port that communicates with the external space. External air is sucked into the internal space of the main body 103 through this communication port formed in the suction port 109. Further, by making the height of the thin plate leg portion 109c, the concentric circular portion 109a and the radial portion 109b different from each other, foreign matters such as paper stick to the surface of the air inlet 109 during operation of the blower 117 described later. It has become.

  As shown in FIGS. 8 and 9, the main body 103 is formed so that the front side region where the intake port 109 is formed is thinner than the back side region where the intake port 109 is not formed. Thereby, since the space | interval of the air inlet 109 and the top plate of the table where the electromagnetic cooker 101 is placed becomes long, the electromagnetic cooker 101 becomes easy to suck the outside air into the main body 103.

As shown in FIG. 10, an exhaust port 113 is formed on the back side of the main body 3 to exhaust the air that is sucked from the intake port 109 and passes through the inside of the main body 103 to the outside. The exhaust port 113 has a slit shape in which a plurality of rectangular openings are formed side by side. The exhaust port 113 is formed near the back side of the main body 103 and the back side of the left side (see FIG. 8).
Further, a cord insertion port 115 into which the power cord 107 is inserted is provided on the right side of the rear side surface of the electromagnetic cooker 101 and to the right of the exhaust port 113. The cord insertion port 115 is a magnet type insertion port.

Next, the internal structure of the electromagnetic cooker 101 will be described with reference to FIG. FIG. 11 is a perspective view showing the internal structure of the electromagnetic cooker 101 with the top plate 105 removed.
As shown in FIG. 11, the electromagnetic cooker 101 is generated from a heating coil 127 provided inside a box-shaped main body 103 and a semiconductor element for power control (not shown) provided inside the main body 103. A heat dissipating part 125 that dissipates the heat and a blower 117 that is provided above the intake port 109 with a rotating shaft 117a that is orthogonal to the bottom part 103a. The semiconductor element for power control controls the start and stop of current supply to the heating coil 127 and the current value of the high-frequency current flowing through the heating coil 127 based on the operation of the operation panel 105b by the user. It is an element. The heating coil 127 and the blower 117 are arranged so as not to overlap each other in plan view. The intake port 109 is formed around the heating coil 127.

  A control circuit unit 135 is disposed on the front side of the main body unit 103. The control circuit unit 135 controls power-on and temperature adjustment based on the operation of the operation panel 105b (see FIG. 6) by the user. Note that the operation panel 105 b may be provided on the side surface of the main body 103. The main body 103 has a thickness of 40 mm.

  The heating coil 127 is disposed substantially at the center of the bottom 103a. The heating coil 127 communicates with the air inlet 109 and the air outlet 113, and is disposed in the flow part 139 through which air blown by the blower 117 flows. The heating coil 127 has a conducting wire portion (not shown) through which a high-frequency current flows, and a conducting wire fixing portion 127a that winds and fixes the conducting wire portion. The conducting wire fixing portion 127a includes an annular central portion 127a-1 disposed at the center, an outer peripheral portion 127a-2 disposed concentrically around the central portion 127a-1, and an outer peripheral portion from the central portion 127a-1. And a plurality of (in this example, eight) wiring portions 127a-3 in which a plurality of groove portions for wiring the conductive wires are formed. The heating coil 127 has the same structure as that of the heating coil 27 in the first embodiment, but a conducting wire having a lower rated current than the conducting wire wired to the heating coil 27 is used.

  On the left side of the heating coil 127, a heat radiating portion 125 is disposed. Similarly to the heating coil 127, the heat radiating unit 125 is disposed in the circulation unit 139. The heat radiating unit 125 includes a heat sink including a plurality of fins 125a extending in a direction in which the air blown by the blower 117 flows. The heat radiating portion 125 is thermally connected to the power control semiconductor element, and radiates heat generated from the power control semiconductor element and conducted by heat conduction from the plurality of fins 125a.

  The blower 117 is disposed on the left side of the front side of the heating coil 127. The blower 117 is a centrifugal blower. For this reason, the air blower 117 disposed immediately above the air inlet 109 can blow the air sucked into the main body 103 through the air inlet 109 in the direction in which the bottom 103a spreads.

  The electromagnetic cooker 101 is disposed around the blower 117 by opening the heat dissipating part 125 and the heating coil 127 side, and forms an air passage 129 for guiding the air blown by the blower 117 to the heat dissipating part 125 and the heating coil 127. A road wall 121 is provided. The air passage wall 121 is disposed along the outer peripheral shape of the blower 117. The air passage 129 constitutes the upstream side of the circulation part 139. The blower 117 sucks air sucked into the main body 103 through the intake port 109 from the direction of the rotating shaft 117a and blows it in the centrifugal direction. For this reason, the air blower 117 blows air in the direction in which the heat dissipating part 125 and the heating coil 127 are not arranged, and the cooling efficiency of the heat dissipating part 125 and the heating coil 127 is lowered. Therefore, in the present embodiment, the air passage wall 121 having the heat radiation part 125 and the heating coil 127 side opened is provided around the blower 117 to block the air in the direction in which the heat radiation part 125 and the heating coil 127 are not arranged. At the same time, it is guided to the opening side. Thus, the air passage wall 121 can guide almost all of the air blown from the blower 117 in the direction of 360 ° around the rotation shaft 117a to the air passage 129. One end of the air passage wall 121 extends from the periphery of the blower 117 to the inside of the left side surface of the main body 103. The other end of the air passage wall 121 is formed along the periphery of the heating coil 127 that extends in the opposite direction to the one end of the air passage wall 121 and is located on the front side. Thereby, the electromagnetic cooker 101 can guide almost all the air blown from the blower 117 to the air passage 129 and can be discharged onto the heat radiating unit 125 and the heating coil 127.

  A flow of wind from the intake port 109 toward the exhaust port 113 is formed in the circulation part 139 by the blower of the blower 117. For this reason, the air that enters the heating coil 127 from the air passage 129 cools the air in the circulation part 139 heated by the heat generated by the heating coil 127 when passing over the heating coil 127 and heats from the circulation part 139. Is exhausted from the exhaust port 113 to the outside of the main body 103. Further, since the fins 125a are formed to extend in the direction in which the air blown by the blower 117 flows, the heat dissipating part 125 does not block the flow of the air, and the air is blown from the blower 117 between the plurality of fins 125a. Circulated air can be circulated. For this reason, the air that enters the heat radiating portion 125 from the air passage 129 passes through the heat radiating portion 125 when passing through the heat radiating portion 125 heated by the heat conducted from the power control semiconductor element, that is, between the plurality of fins 125a. cool. Further, the air entering the heat radiating portion 125 from the air passage 129 is quickly exhausted to the outside of the main body portion 103 from the exhaust port 113 without staying between the plurality of fins 125a in a state where heat is taken from the heat radiating portion 125. The Thereby, the temperature in the circulation part 139 falls efficiently.

  As shown in FIG. 11, the power supply circuit unit 137 generates a high-frequency current or other predetermined power supply voltage that flows from the commercial power supply supplied via the power cord 107 and the cord insertion port 115 to the conducting wire portion of the heating coil 127. A circuit component group 137a is provided near the exhaust port 113. Although the temperature in the vicinity of the circuit component group 137a of the power supply circuit unit 137 rises due to the heat generated by the circuit component group 137a, the circuit component group 137a is disposed in the vicinity of the exhaust port 113. Air near the group 137a is also exhausted from the exhaust port 113. Thereby, the electromagnetic cooker 101 can prevent the temperature inside the main body 103 from increasing due to heat generated by the power supply circuit unit 137.

As described above, the electromagnetic cooker 101 can generate an air flow from the air inlet 109 to the air outlet 113 by the blower 117 and distribute it to the circulation part 139 formed inside the main body 103. As a result, the heat generated in the heating coil 127 is directly exhausted from the exhaust port 113 to the outside of the main body unit 103 by the airflow flowing through the circulation unit 139, and from the exhaust port 113 through the heat dissipation unit 125. Exhaust indirectly to the outside. Furthermore, the heat generated in the power supply circuit unit 137 is also exhausted to the outside of the main body unit 103 by the airflow flowing through the flow unit 139. Thereby, the electromagnetic cooker 101 can efficiently exhaust the heat generated by the heating coil 127 to the outside of the main body 103 and prevent the temperature inside the main body 103 from rising.
Thus, even if the internal space of the main body 103 in which the heating coil 127 is arranged is narrow, the electromagnetic cooker 101 can prevent the temperature of the internal space of the main body 103 from being increased due to heat generated by the heating coil 127.

  As shown in FIG. 11, the electromagnetic cooking device 101 is formed so as to protrude from the bottom 103 a toward the inside of the main body 103, and prevents foreign matter from entering from the exhaust port 113 to the inside of the main body 103. 133. The foreign matter entry prevention unit 133 is disposed between the exhaust port 113 and the power supply circuit unit 137. The foreign matter entry prevention unit 133 is formed to be higher than the height of the circuit component group 137a of the power supply circuit unit 137. The foreign matter entry prevention unit 133 prevents foreign matter entering from the exhaust port 113 from entering the inside of the main body portion 103. The foreign matter includes, for example, a metallic foreign matter such as a knife or a fork or moisture such as water.

  The foreign matter entry prevention unit 133 has an upper region 133a higher than the mounting surface on which the circuit component group 137a of the power supply circuit unit 137 is mounted, and a lower region 133b lower than the mounting surface. The upper region 133a and the lower region 133b are integrally formed, for example. Since the upper region 133a is disposed on the front surface of the circuit component group 137a, for example, a metal foreign object that has entered from the exhaust port 113 during use of the electromagnetic cooker 101 contacts the circuit component group 137a and the power supply circuit unit 137. Can prevent short circuit failure. On the other hand, the lower region 133b is located at a position lower than the mounting surface of the power supply circuit unit 137. For this reason, the lower region 133 b can prevent foreign matters such as water entering from the exhaust port 113 from entering the main body 103.

  In addition, the foreign matter entry prevention unit 133 includes a passage portion 133c through which air that has circulated through the circulation portion 139 passes to the exhaust port 113 side. The passage part 133c is formed by cutting out at least a part of the upper region 133a of the foreign matter entry prevention part 133. Since the foreign matter entry preventing portion 133 has the passage portion 133c, it does not prevent the air inside the main body portion 103 from being exhausted to the outside through the exhaust port 113. In the present embodiment, a plurality of foreign matter entry prevention units 133 are provided. In addition, the shapes of the plurality of foreign matter intrusion prevention units 133 need not be the same. Although illustration is omitted, the foreign matter entry prevention unit 133 may have only the lower region 133b, similar to the foreign matter entry prevention unit 33 in the first embodiment.

Next, a magnetic flux leakage prevention unit that prevents the magnetic flux generated by the heating coil 127 from leaking to the outside will be described with reference to FIGS. 14 and 15. FIG. 14 is a perspective view showing a state where the electromagnetic cooker 101 is cut in parallel to the left side surface and the right side surface through the central axis of the heating coil 127. FIG. 15 is a cross-sectional view of the electromagnetic cooker 101 as viewed in the normal direction of the left side surface of the heating coil 127 when the electromagnetic cooker 101 shown in FIG. 14 is cut.
As shown in FIG. 14, the electromagnetic cooker 101 is disposed between the bottom 103 a of the main body 103 and the heating coil 127, and the magnetic flux generated from the heating coil 127 is formed of a nonmagnetic metal material. 103 has a magnetic flux leakage prevention unit 151 that prevents leakage to the outside of the magnetic field 103. The magnetic flux leakage prevention unit 151 is disposed vertically below the heating coil 127. The magnetic flux leakage prevention unit 151 is formed of a material other than the material that forms the cooking container to be heated placed on the top plate 105. The magnetic flux leakage prevention part 151 is made of aluminum, for example. The magnetic flux leakage prevention unit 151 is formed with a thickness of 0.3 mm or more and 1 mm or less, for example. In the present embodiment, the magnetic flux leakage prevention unit 151 is formed with a thickness of, for example, 0.6 mm. The magnetic flux leakage prevention unit 151 has an outer shape that follows the outer shape of the heating coil 127. In this embodiment, the magnetic flux leakage prevention part 151 has a circular outer shape. Therefore, the magnetic flux leakage prevention part 151 has a thin disk shape. The magnetic flux leakage prevention part 151 has a diameter that is substantially the same as the inner diameter of the outer peripheral part 127a-1 of the heating coil 127. Since the magnetic flux leakage prevention unit 151 is disposed in the circulation unit 139 (see FIG. 13), a temperature rise due to radiant heat from the heating coil 127 is prevented.

  Between the magnetic flux leakage prevention part 151 and the heating coil 127, a gap part 153 of 3 mm or more and 35 mm or less is provided. That is, the lower limit value of the width of the gap portion 153 is 3 mm, and the upper limit value is 35 mm. As shown in FIG. 15, the width L2 of the gap 53 is, for example, the distance between the surface of the magnetic flux leakage prevention part 151 and the bottom of the groove part of the wiring part 127a-3 of the conducting wire fixing part 127a. The surface of the magnetic flux leakage prevention unit 151 is a surface where the magnetic flux leakage prevention unit 151 faces the heating coil 127. The bottom part of the groove part of the wiring part 127a-3 is a part in contact with the conductor part located closest to the magnetic flux leakage prevention part 151 in the depth direction of the groove part when the conductor part is wired in this groove part. A region sandwiched between the surface of the magnetic flux leakage prevention unit 151 and the plane that includes the bottom of the groove portion of the wiring portion 127a-3 and faces the surface of the magnetic flux leakage prevention unit 151 is the gap portion 153.

  In the gap portion 153, a power circuit portion 137 and a magnetic path forming portion 155 are arranged. The magnetic path forming unit 155 is made of a magnetic material, and forms a part of a magnetic path through which the magnetic flux generated from the heating coil 127 passes. The magnetic path forming portion 155 is disposed inside the conducting wire fixing portion 127a. Magnetic flux generated by applying a high-frequency current to the heating coil 127 is linked to the bottom of the cooking container to be heated above the top plate 105. Thereby, an eddy current is induced at the bottom of the cooking container and Joule heat is generated. Thus, the cooking container is induction-heated by the magnetic flux generated from the heating coil 127. On the other hand, the magnetic flux generated by flowing a high-frequency current through the heating coil 127 is almost converged on the magnetic path forming unit 155 below the heating coil 127. Thereby, it can prevent that the magnetic flux which generate | occur | produces with the heating coil 127 interlinks with the top plate of the table where the electromagnetic cooker 101 is set | placed. However, all of the magnetic flux generated by the heating coil 127 is not converged on the magnetic path forming unit 155, and a part of this magnetic flux leaks from the magnetic path forming unit 155 and becomes a leakage magnetic flux. However, the magnetic flux leakage prevention unit 151 is disposed above the bottom 103 a of the main body 103 and below the magnetic path forming unit 155. Since the magnetic flux leakage prevention unit 151 shields the leakage magnetic flux, the leakage magnetic flux does not leak outside the electromagnetic cooker 101. For this reason, even if the top plate of the table on which the electromagnetic cooker 101 is placed at the time of use is formed of a material that is induction-heated, the top plate is prevented from being induction-heated by the electromagnetic cooker 101. .

Since the width L2 of the gap 153 is set based on the same idea as the setting of the width L1 of the gap 53 in the first embodiment, the description thereof is omitted.
As described above, the electromagnetic cooker 101 according to the present embodiment has the width L2 of the gap 153, that is, the magnetic flux leakage prevention unit 151 and the heating coil, based on the distance between the cooking container to be heated and the heating coil 127. The distance to 127 is set. As a result, the electromagnetic cooker 101 according to the present embodiment has the heating coil even when the thickness of the main body 103 is reduced to, for example, 40 mm or less and the distance between the heating coil 127 and the table top is shortened. Can be effectively prevented from leaking out of the main body 103. As a result, even if, for example, the top plate of the table on which the electromagnetic cooker 101 is placed is made of a metal material with high permeability, the magnetic flux generated from the heating coil 127 is shielded by the magnetic flux leakage prevention unit 151 and this top. Do not link with the board. Thereby, the temperature rise of the top plate of the table is prevented when the electromagnetic cooker 101 is used.

(Modification)
An electromagnetic cooker according to a modification of the first and second embodiments will be described with reference to FIGS. 16 and 17. The electromagnetic cooker according to this modification is characterized in that the shape of the intake port is different from the shape of the intake port in the first and second embodiments. Hereinafter, taking the first embodiment as an example, the electromagnetic cooker according to the present modification will be briefly described as different from the electromagnetic cooker 1. In addition, the same code | symbol is attached | subjected to the component which show | plays the effect | action and function similar to the electromagnetic cooker 1 by the said 1st Embodiment, and the description is abbreviate | omitted.

FIG. 16 is a bottom view of the electromagnetic cooker 301 according to this modification. FIG. 17 is an enlarged view of the vicinity of the second air inlet 311.
As shown in FIGS. 16 and 17, the electromagnetic cooker 301 according to the present modification includes a communication port formed in a spiral shape in the same direction as the rotation directions of the first and second blowers (not shown). The first and second intake ports 309 and 311 are provided. Since the first intake port 309 and the second intake port 311 have the same shape, the structure of the first and second intake ports 309 and 311 will be described below using the second intake port 311 as an example. explain.

  The second air inlet 311 has a flat dish shape (petriform shape), and is formed to protrude downward from the bottom portion 303 a of the main body portion 303. The second air inlet 311 has a plurality of concentric circular portions 311a formed concentrically and a plurality of radial portions 311b extending radially outward from the concentric circular portions 311a arranged on the innermost side. . The plurality of radial portions 311b are formed to bend in the same direction as the rotation direction of a second blower (not shown) disposed above the second air inlet 311. The plurality of concentric circular portions 311a are arranged with a predetermined gap therebetween, and the plurality of radial portions 311b are arranged with a predetermined gap therebetween. A region surrounded by the adjacent concentric circular portions 311a and the adjacent radial portions 311b serves as a communication port that connects the internal space of the main body portion 303 and the external space where the electromagnetic cooker 301 is disposed. In addition, the space surrounded by the concentric circular portion 311a arranged on the innermost side is also a communication port.

  Since the radial part 311b is formed to be curved, the gap between the adjacent radial parts 311b becomes longer from the inside to the outside of the second air inlet 311. For this reason, the communication port surrounded by the adjacent concentric circular part 311a and the adjacent radial part 311b becomes larger from the inner side to the outer side of the second intake port 311 in plan view. Furthermore, the outer shape of the communication port is trapezoidal as a whole, and the longer the trapezoidal leg is located on the rotational direction side of the second blower. For this reason, the plurality of communication ports are formed in a spiral shape in the same direction as the rotation direction of the second blower as a whole in plan view. The second intake port 311 has a spiral communication port in the same direction as the rotation direction of the second blower, thereby improving the intake efficiency.

  Further, the second air inlet 311 has a plurality (13 in this example) of thin plate leg portions 311c provided at predetermined intervals on the radial portion 311b between the adjacent concentric circular portions 311. The thin plate leg portion 311c is formed to be higher than the height of the concentric circle portion 311a and the radial portion 311b. Different heights of the thin plate leg portion 311c, the concentric circular portion 311a and the radial portion 311b prevent foreign matters such as paper from sticking to the surface of the second air inlet 311 during operation of the second blower. It has become.

As described above, according to the electromagnetic cooking device according to the present modification, the efficiency of intake air into the main body portion is improved, so that cool air can be efficiently blown into the main body portion, and the cooling efficiency inside the main body portion is also improved. To do.
In this example, the modified example of the first embodiment has been described. However, the intake port having the structure shown in FIGS. 16 and 17 can be applied to the intake port of the second embodiment.

(Other variations)
An electromagnetic cooker according to another modification of the first and second embodiments will be described with reference to FIG. The electromagnetic cooker according to the present modification is characterized in that it includes foreign object intrusion prevention units arranged in a staggered manner. Hereinafter, taking the first embodiment as an example, the electromagnetic cooker according to the present modification will be briefly described as different from the electromagnetic cooker 1. In addition, the same code | symbol is attached | subjected to the component which show | plays the effect | action and function similar to the electromagnetic cooker 1 by the said 1st Embodiment, and the description is abbreviate | omitted.

FIG. 18 is a diagram for explaining the electromagnetic cooker 401 according to this modification, and is a plan view of the ionization cooker 401 with the top plate 5 (not shown in FIG. 18) removed.
As shown in FIG. 18, the electromagnetic cooking device 401 according to the present modification includes a plurality of foreign matter entry prevention units 433 arranged in a staggered manner between the exhaust port 13 and the power supply circuit unit 37. The foreign matter entry preventing portion 443 is formed to project in a zigzag manner from the bottom 3 a of the main body 3 toward the inside of the main body 3, for example. The gap formed between the adjacent foreign matter entry prevention portions 433 by arranging the plurality of foreign matter entry prevention portions 433 in a staggered manner is a passage portion through which air circulated through the first and second circulation portions 39 and 41 passes. 433c. The plurality of foreign matter entry prevention units 433 include an upper region and a lower region that perform the same functions as the upper region 33a and the lower region 33b provided in the foreign matter entry prevention unit 33, and cut at least a part of the upper region. You may have the passage part formed lacking. The foreign matter entry prevention unit 433 includes, for example, a foreign matter entry prevention unit that protrudes from the bottom 3 a of the main body 3 toward the inside of the main body 3, and a foreign matter entry that protrudes from the back side of the top plate 5 toward the inside of the main body 3. You may form so that a prevention part may be arrange | positioned in zigzag form.

As described above, the electromagnetic cooker according to the present modification prevents the temperature inside the main body from rising and prevents foreign matter from entering the main body, so that the failure rate of the electromagnetic cooker can be reduced. .
In addition, although this example demonstrated as a modification of the said 1st Embodiment, the foreign material approach prevention part of the structure shown in FIG. 18 is applicable also to the foreign material approach prevention part in the said 2nd and 3rd embodiment.

1, 101, 201, 301, 410 Electromagnetic cooker 3, 103, 203, 303 Main body part 3a, 103a, 203a, 303a Bottom part 3b, 103b Leg part 5, 105, 205 Top plate 5a, 105a, 205a Pan bottom arrangement part 5b , 105b, 205b Operation panel 7, 107 Power cord 9, 309 First intake port 9a, 109a, 209a, 311a Concentric circular part 9b, 109b, 209b, 311b Radial part 9c, 109c, 311c Thin plate leg part 11, 311 Second Inlet 13, 113, 213 Exhaust outlet 15, 115 Code insertion port 17 First blower 17 a, 19 a, 117 a Rotating shaft 19 Second blower 21 First air passage wall 23 Second air passage wall 25, 125 Heat radiation part 25a, 125a Fin 27, 127, 227 Heating coil 27a, 127a, 22 a Conductor fixing portion 27a-1, 127a-1 Central portion 27a-2, 127a-2 Outer peripheral portion 27a-3, 127a-3 Wiring portion 29 First air passage 31 Second air passage 33, 133, 233, 433 Foreign matter entry prevention unit 33a, 133a Upper region 33b, 133b Lower region 33c, 133c Passing unit 35, 135 Control circuit unit 37, 137 Power supply circuit unit 37a, 137a Circuit component group 39 First distribution unit 41 Second distribution unit 51, 151 Magnetic flux leakage prevention part 51a Through hole 53 Gap part 55, 155 Magnetic path forming part 109, 209 Air inlet 117, 217 Blower 121, 221 Air path wall 129, 229 Air path 139, 239 Distribution part

In order to solve the above problem, an electromagnetic cooker according to an aspect of the present invention is a box-shaped heating coil provided inside a main body having a bottom portion provided with a step, and a bottom portion of the main body portion. wherein disposed between the heating coils, and the magnetic flux leakage prevention portion where the magnetic flux generated from the heating coil is formed of a metal material of the nonmagnetic material is prevented from leaking to the outside of the body portion, the front SL bottom and formed air inlet, formed in the body portion, the air sucked from the intake port and an exhaust port for exhausting to the outside of the main body portion, before Symbol air inlet, relatively of said bottom It is disposed at a higher side, before Symbol flux leakage preventing portion and the exhaust port shall be the characterized in that it is arranged in relatively low side of the bottom portion.

Claims (6)

A heating coil provided inside the box-shaped main body,
A magnetic flux leakage prevention unit that is disposed between the bottom of the main body and the heating coil and is formed of a nonmagnetic metal material and prevents magnetic flux generated from the heating coil from leaking to the outside of the main body. When,
A gap provided between the magnetic flux leakage prevention part and the heating coil and having a width of 3 mm or more and 35 mm or less;
An air inlet formed in the bottom,
An exhaust port that is formed in the main body portion and exhausts air sucked from the intake port to the outside of the main body portion;
The magnetic flux leakage prevention part is disposed between the intake port and the exhaust port,
The said bottom part has a level | step difference from which the area | region where the said magnetic flux leak prevention part is arrange | positioned becomes lower than the area | region where the said air inlet is arrange | positioned. The electromagnetic cooker according to claim 1, wherein the magnetic flux leakage prevention part is formed to a thickness of 0.3 mm or more and 1 mm or less. The electromagnetic cooker according to claim 1, wherein the magnetic flux leakage prevention unit has an outer shape that follows an outer shape of the heating coil. The electromagnetic cooker according to any one of claims 1 to 3, wherein the magnetic flux leakage prevention unit is arranged vertically below the heating coil. A magnetic path forming part that forms a part of a magnetic path that is formed of a magnetic material and through which a magnetic flux generated from the heating coil passes is provided between the heating coil and the magnetic flux leakage prevention part. Item 5. The electromagnetic cooker according to any one of items 1 to 4. The electromagnetic cooker according to any one of claims 1 to 5, wherein the main body has a thickness of 40 mm.

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