JP4870642B2 - Induction heating coil and induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating coil and an induction heating cooker, and more particularly to an induction heating coil having a large number of turns and an induction heating cooker equipped with the induction heating coil.

A conventional induction heating apparatus heats an object to be heated (such as a pan) by an induction current due to electromagnetic induction, and a top plate on which the object to be heated is placed, and induction heating arranged immediately below the top plate. A magnetic field is generated by a high-frequency current supplied to the induction heating coil.
At this time, the induction heating coil is disposed in a constrained space between the grill portion (same as a roaster for grilling fish or the like), and has a large number of turns. In order to make the temperature distribution on the bottom surface of the heated body uniform, an invention is disclosed in which a spiral heating coil is held by a donut-shaped magnetic body having a substantially U-shaped cross section (see, for example, Patent Document 1). ).

In addition, the only metal that can be heated in an induction heating cooker is an iron-based metal with high magnetic permeability, so it is manufactured using a non-magnetic, low-resistivity metal such as copper or aluminum (hereinafter referred to as “non-ferrous”). Cooking utensils materials (eg pans) could not be heated. For this reason, in order to further spread the induction heating cooker in the future, it is necessary to greatly reduce the restrictions on the metal used to manufacture cooking utensils (such as pans). It has been known from the past that the frequency should be increased and the number of turns of the induction heating coil should be increased.
At this time, the higher the frequency, the higher the frequency current flows in the vicinity of the surface of the induction heating coil due to the skin effect, and the temperature of the surface itself increases. Therefore, in order to prevent such an increase in the surface temperature and improve the loss of the electromagnetic induction heating coil even in a higher frequency region, the composite conductor in which the strands are twisted together is covered with a cladding tube, and the composite conductor is covered. An invention is disclosed in which a passage through which a cooling medium flows is formed between a pipe and a cladding tube (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-71951 (5th page, FIG. 3) JP 2004-47483 A (page 3, FIG. 2)

  However, the electromagnetic induction heating coil disclosed in Patent Document 1 is housed in a constrained space and requires a large number of turns, so that the winding density increases, and as a result, the cooling air flows inside the stack. There was a problem that it was difficult to reach the winding. For this reason, the induction heating coil is not effectively cooled by the cooling air, and the winding temperature becomes very high, or the melting point temperature of a general winding film reaches about 150 ° C. There were inconveniences such as faster film deterioration.

  In addition, the induction heating coil disclosed in Patent Document 2 allows a refrigerant to flow between the composite conductor and the cladding tube, and the gap between the composite conductor and the cladding tube is narrow. There is a problem that distribution becomes difficult and an apparatus for flowing the refrigerant becomes large.

  The present invention has been made to solve the above-described problems, and enables cooling of the winding inside the induction heating coil while having a simple structure, thereby improving the cooling performance during energization. An induction heating coil that can be used, and an induction heating cooker equipped with such an induction heating coil are obtained.

In the induction heating coil according to the present invention, a coil conductor is wound in a plurality of stages in the axial direction to form one layer, and the one layer is wound in a plurality of layers in the radial direction to have a winding portion formed in a cylindrical shape. A heating coil,
A cylindrical ventilation body is provided that has a ventilation hole that surrounds the layers and is ventilated in the axial direction between each of the plurality of layers or for each predetermined number of layers. It is characterized by being.

In the induction heating coil according to the present invention, a ventilation body having air permeability is disposed between wound coil conductors (hereinafter referred to as “windings”). The cooling air can reach up to. Therefore, it is possible to prevent an excessive temperature rise in the interior, which becomes a problem when the number of turns of the induction heating coil is increased.
In the present invention, the windings (coil conductors) are wound in a plurality of stages in the axial direction (height direction) and a plurality of layers in the radial direction (horizontal direction). The product of each or both of “the number of steps” and “the number of layers” in the radial direction is referred to as “the number of turns”.

[Embodiment 1: Cylindrical ventilation body]
FIG. 1 explains an induction heating coil according to Embodiment 1 of the present invention, and FIG. 1 (a) is a sectional view in side view schematically showing the whole. (B) is sectional drawing of the side view which shows a winding part typically. In the following description, the same or corresponding parts are denoted by the same reference numerals, and a part of the description is omitted.

In FIG. 1, the induction heating coil 100 includes a wound portion around which the winding 1 is wound (winded), and a coil base 6 that holds the wound portion.
In the wound portion of the induction heating coil 100, the winding (same as the coil conductor) 1 is wound in a plurality of stages in the axial direction and in a plurality of layers and in the radial direction. At this time, the cylindrical ventilation body 3 is disposed between the layers of the winding 1 (the first layer, the second layer, the second layer, the third layer, and the like). There are a plurality of cylindrical ventilation bodies 3, each of which has a cylindrical shape provided with ventilation body ventilation holes 3w that allow ventilation in the axial direction (height direction).
The coil base 6 is formed along an annular bottom surface 63 having a center hole 61, an inner periphery of the bottom surface 63, an inner surface 62 perpendicular to the bottom surface 63, and an outer periphery of the bottom surface 63. An outer surface 64 perpendicular to 63, and a coil base ventilation hole 6w is formed in the bottom surface 63 so as to allow ventilation. Further, an air duct 7 is formed below the bottom surface 63.

Therefore, the cooling air supplied to the air duct 7 passes through the coil base ventilation hole 6 w and flows into the ventilation body ventilation hole 3 w and flows into the winding portion of the induction heating coil 100. That is, an air passage in the axial direction (same in the height direction) is formed, and after the winding 1 is cooled, it flows out from above. At this time, the cylindrical ventilation body 3 is manufactured from a material excellent in heat resistance because the winding 1 generates heat and becomes high temperature.
The number of turns of the induction heating coil 100 (the number of stages and the number of layers around which the winding 1 is wound) is not limited and is changed according to the required amount of heat generation. In FIG. 1, the cylindrical ventilation body 3 is disposed between all the layers, but the present invention is not limited to this, and there may be an interlayer where the cylindrical ventilation body 3 is not disposed.

From the above, according to the induction heating coil 100 (Embodiment 1), the tubular ventilation body 3 provided with the ventilation body ventilation hole 3w is used for the purpose of flowing the cooling air for cooling the inside of the winding part. Since the air passage reaching the inside of the winding portion is formed, the inside of the winding portion having a large number of windings can be cooled with high efficiency and reliability together with the cooling of the outer periphery.
Furthermore, by using the cylindrical ventilation body 3 provided with the ventilation body ventilation hole 3w, it becomes possible to form a reliable air path with a long life. Moreover, since the cylindrical ventilation body 3 has a predetermined hardness (anti-deformability), the winding work is facilitated, and an increase in the manufacturing cost of the induction heating coil 100 is suppressed.

[Embodiment 2: Cylindrical ventilation body]
2 and 3 illustrate an induction heating coil according to Embodiment 2 of the present invention. FIG. 2 (a) is a perspective view schematically showing the whole, and FIG. 2 is a perspective view schematically showing the inner diameter of the winding part, FIG. 2C is a side sectional view schematically showing the inner diameter of the winding part, and FIG. 3A is the inner diameter of the winding part. FIG. 3B is a partial cross-sectional view in side view schematically showing the wind flow.

  In FIG. 2, the induction heating coil 200 is provided with a cylindrical ventilation body 203 every three layers. That is, the winding 1 is wound on the inner surface 62 of the coil base 6 with the first layer from the lower stage to the upper stage, and then the second layer moves from the upper stage to the lower stage while directly contacting each other, and the third layer is the lower stage. It is rolled up from the top. Therefore, the cylindrical ventilation body 203 is arranged, and the winding 1 penetrates the winding hole 203c of the cylindrical ventilation body 203, and the fourth layer is wound around the cylindrical ventilation body 203 from the upper stage to the lower stage. is there. And similarly, the cylindrical ventilation body 203 is arrange | positioned between the 6th layer and the 7th layer.

At this time, the ventilator hole 203w that allows ventilation in the axial direction (height direction) is formed in the cylindrical ventilator 203. Moreover, the phase of the coil base ventilation hole 6w formed in the coil base 6 holding the induction heating coil 200 and the cylindrical ventilation body 203 coincide with each other.
Therefore, the cooling air supplied to the air duct 7 passes through the coil base ventilation hole 6w and flows into the ventilation body ventilation hole 203w of the cylindrical ventilation body 203, and cools the winding 1 inside the induction heating coil 200. (Refer to FIG. 3B).
In addition, although the cylindrical ventilation body 203 is arrange | positioned for every three layers, the induction heating coil 200 is not limited to this, A cylindrical ventilation body is according to the cooling performance requested | required. The interval at which 203 is arranged (the number of layers sandwiched between the tubular vents 203) is appropriately determined. Further, the interval at which the cylindrical ventilation body 203 is arranged may be different between the inner diameter side and the outer diameter side.

[Embodiment 3: Planar ventilation body]
FIG. 4 illustrates an induction heating coil according to Embodiment 3 of the present invention, and is a cross-sectional view in side view schematically showing a wound part.
In FIG. 4, a winding (same as the coil conductor) 1 is wound around the winding portion of the induction heating coil 300 in a plurality of stages in the axial direction (height direction) and in a plurality of layers in the radial direction (horizontal direction). Is formed. At this time, the planar ventilation body 303 is disposed between the stages of the winding 1 (first stage, second stage, second stage, third stage, etc.). There are a plurality of planar ventilation bodies 303 each having a flat plate shape having ventilation body ventilation holes 303w that allow ventilation in a direction parallel to the surface (horizontal direction).

Accordingly, a radial air path (same in the horizontal direction) is formed by the air vent hole 303w, and the cooling air flows into the air vent hole 303w from the inner diameter side of the winding portion, so that After cooling the winding 1 inside the turning part, it flows out from the outer diameter side. At this time, the planar ventilation body 303 is manufactured from a material excellent in heat resistance because the winding 1 generates heat and becomes high temperature.
Note that the number of turns of the induction heating coil 300 is not limited, and the number of turns is changed according to the required amount of heat generation. Further, in FIG. 4, the planar ventilation body 303 is disposed between all the stages, but the present invention is not limited to this, and there may be an interstage where the planar ventilation body 303 is not disposed. .

[Embodiment 4: Rod-like ventilation body]
5A and 5B illustrate an induction heating coil according to Embodiment 4 of the present invention, in which FIG. 5A is a partial cross-sectional view schematically showing a winding part in the middle of manufacture, and FIG. 5B is completed. FIG. 6 is a partial sectional view in side view schematically showing the wound portion, and FIG. 5C is a partial sectional view in plan view schematically showing the completed wound portion.
In FIG. 5, the outer periphery of the winding 1 (same as the coil conductor) 1 of the induction heating coil 400 is covered with a covering 4. And when winding the coil | winding 1 covered with the coating | covering body 4, the rod-shaped ventilation body 403 is pinched and wound in the position which wants to form an air path (refer (a) of FIG. 5). And after winding the coil | winding 1, the contact part of the coating | coated body 4 is fuse | melted by heating, and it is made to adhere mutually.

At this time, the rod-like ventilator 403 is formed with a ventilator vent 403w that allows ventilation in the axial direction (height direction). Therefore, the cooling air flows into the air vent hole 403w of the rod-like vent 403 and cools the winding 1 inside the induction heating coil 400. Therefore, the induction heating coils 100 and 200 (Embodiments 1 and 2). ) Is obtained.
The shape (diameter or thickness or width), interval (quantity), etc. of the rod-like air-permeable body 403 are determined so as to compensate the cooling performance in accordance with the amount of heat generated by the induction heating coil 400 and the amount of cooling air. is there.
Furthermore, although the rod-shaped ventilation body 403 is arranged in the axial direction (height direction) in the above, it may be arranged in the radial direction (plane direction). By disposing the rod-shaped aeration body 403 in the radial direction (plane direction), the same effect as that of the induction heating coil 300 (Embodiment 3) can be obtained.

[Embodiment 5: Coil base cylindrical rib]
FIG. 6 explains an induction heating coil according to Embodiment 5 of the present invention, and is a cross-sectional view in side view schematically showing the portion.
In FIG. 6, the induction heating coil 500 is housed in a coil base 506. At the bottom surface 563 of the coil base 506, cylindrical tubular ribs 503 (for example, about several millimeters in thickness) are formed at predetermined intervals, and the tubular ribs 503 are provided with rib vent holes 503w that allow ventilation in the axial direction. Is formed.
Therefore, if the winding 1 is wound so as to wind the cylindrical rib 503, the cooling air that has reached the lower surface of the coil base 506 flows into the rib vent hole 503 w and is wound inside the induction heating coil 500. Then, the air flows out from the tip of the cylindrical rib 503 to the inside, and the cooling air reaches a wide range. A coil base vent hole 563w is formed on the bottom surface 563 of the coil base 506.

According to the induction heating coil 500 (Embodiment 5), the air passage between the windings 1 is used by using the cylindrical rib 503 provided on the coil base 506 for the purpose of flowing the cooling air for cooling it. Therefore, the induction heating coil 500 having a large number of windings can cool the outer periphery and cool the inside with high efficiency and reliability.
In addition, the ventilation body (cylindrical shape, planar shape, rod shape) described in the first to fourth embodiments is applied to the wound portion (the range in which the winding 1 is in direct contact) between the tubular ribs 503. You may arrange.

[Embodiment 6: Bar-shaped spacer]
7A and 7B illustrate an induction heating coil according to Embodiment 6 of the present invention, in which FIG. 7A is a partial sectional view schematically showing a portion near the inner diameter of the winding portion, and FIG. It is a fragmentary sectional view of the side view which shows a flow typically.

In FIG. 7, in the induction heating coil 600, rod-like spacers 603 are arranged for every three layers. That is, the induction heating coil 600 has a bar-shaped spacer 603 instead of the cylindrical ventilation body 203 in the induction heating coil 200 (Embodiment 2).
The rod-shaped spacers 603 are parallel to the axial direction (height direction) and are arranged at a predetermined interval in the circumferential direction. Therefore, the windings 1 abut against each other via the rod-shaped spacers 603, A gap 2w is formed in a range where the rod-shaped spacers 603 are not in contact with each other.

At this time, the coil base ventilation hole 6w and the gap 2w formed in the coil base 6 holding the induction heating coil 600 coincide with each other in at least one of the phases.
Therefore, the cooling air that has passed through the coil base ventilation hole 6w flows into the gap 2w and cools the winding 1 inside the induction heating coil 600. Therefore, the same effect as in induction heating coil 200 (Embodiment 2) can be obtained.

It should be noted that the size and shape of the rod-shaped spacer 603 in the induction heating coil 600 and the arrangement form (such as arrangement intervals in the step direction and the layer direction) are not limited, and are appropriately determined according to the required cooling performance. is there.
Furthermore, instead of the planar ventilation body 303 in the induction heating coil 300 (Embodiment 3), rod-shaped spacers 603 may be arranged in the radial direction (horizontal direction). At this time, the same effect as the induction heating coil 300 (Embodiment 3) is obtained.

[Embodiment 7: Coil base rod-shaped rib]
8A and 8B illustrate an induction heating coil according to Embodiment 7 of the present invention, in which FIG. 8A is a partial cross-sectional view schematically showing the vicinity of the inner diameter of the winding portion, and FIG. It is a fragmentary sectional view of the side view which shows a flow typically.

In FIG. 8, the induction heating coil 700 is provided with rod-like ribs 705 every three layers. That is, induction heating coil 700 has rod-shaped rib 705 instead of cylindrical rib 503 in induction heating coil 500 (Embodiment 5).
The rod-shaped ribs 705 are provided on the bottom surface 763 of the coil base 706, and are parallel to the axial direction (height direction) and arranged at a predetermined interval in the circumferential direction. Accordingly, the windings 1 are in contact with each other via the rod-shaped ribs 705, and a gap 2w is formed in a range where the windings 1 are not in contact with the rod-shaped ribs 705 between the windings 1.

At this time, the coil base ventilation hole 6w formed in the coil base 706 holding the induction heating coil 700 and the gap 2w coincide with each other at least in any phase.
Therefore, the cooling air that has passed through the coil base ventilation hole 6w flows into the gap 2w and cools the winding 1 inside the induction heating coil 700. Therefore, an effect similar to that of induction heating coil 500 (Embodiment 5) is obtained.

  It should be noted that the size and shape of the rod-shaped spacer 603 in the induction heating coil 600 and the arrangement form (such as arrangement intervals in the step direction and the layer direction) are not limited, and are appropriately determined according to the required cooling performance. is there.

[Eighth embodiment: rod-shaped spacer]
FIG. 9 is for explaining the induction heating coil according to the eighth embodiment of the present invention, and is a partial sectional view in plan view schematically showing the inner diameter side of the winding part.
In FIG. 9, in the induction heating coil 400 (Embodiment 4) described above, the rod-shaped aeration body 403 is arranged between the windings 1 (interlayer), whereas the induction heating coil according to Embodiment 8 is used. In 800, a gap that allows ventilation is formed at a position corresponding to the rod-shaped vent 403.
That is, the winding 1 is wound into a cylindrical shape together with an air path forming member (not shown), and the cover 4 is welded and fixed to each other, and then the air path forming member is removed and formed on the removed trace. The gap is defined as a gap 2w that allows ventilation (in FIG. 5 (c), the rod-like ventilation body 403 is deleted, and the ventilation hole 403w is replaced with a gap that allows ventilation).
Therefore, in induction heating coil 800, the same effect as in induction heating coil 400 (Embodiment 4) is obtained.

[Embodiment 9: induction heating cooker]
10 and 11 show an example of an induction heating cooker according to Embodiment 9 of the present invention, in which FIG. 10 is a perspective view, and FIG. 11 is a side sectional view showing the part.
10 and 11, an induction heating cooker 900 includes a box-shaped main body case 10 having an upper surface and a front surface that are open, a top plate (top plate) 12 that is attached to the upper surface opening of the main body case 10, and a top plate. 12, a holding frame 11 that holds the periphery of 12, induction heating coils 100 a, 100 b, 100 c (see Embodiment 1) disposed immediately below the top plate 12, and cooling means for cooling the induction heating coil 100 and the like ( (Not shown) and an outside air inlet 15 provided on the rear side of the holding frame 11.

The top plate 12 is made of a nonmagnetic material such as plate glass. Immediately above the induction heating coil 100 (corresponding position), placement unit displays 13 a, 13 b, and 13 c that display the placement position of the object to be heated 14 are printed on the top surface of the top plate 12.
A front panel 21 is provided on the front surface of the main body case 10, an operation unit 22 is provided on the front panel 21, and a drawer type roaster 23 is provided on the front opening.

In the following description, reference numerals “a, b, c” are omitted from the description of common contents.
10 and 11, a middle plane 8 is provided in the body case 10 in parallel with the top plate 12, and the coil base 6 is installed on the middle plane 8. An air duct 7 is formed between the middle plane 8 and the bottom surface 63 of the coil base 6, and a predetermined interval is formed between the winding portion and the top plate 12.

  Therefore, as described above, the induction heating coil 100 can cool the inside with high efficiency and reliability together with the cooling of the outer periphery, so that the reliability of the induction heating cooker 900 can be improved.

  In addition, the induction heating coil installed in the induction heating cooker 900 is not limited to the three induction heating coils 100 (Embodiment 1), but induction heating coils 100 to 800 (Embodiments 1 to 8). ) May be selectively installed in a predetermined number. Moreover, you may mix the conventional induction heating coil (The said air path is not formed).

As described above, since the induction heating coil of the present invention can cool the inside with high efficiency and reliability together with the cooling of the outer periphery, various induction heating coils that have excellent cooling reliability and are supplied with low frequency and high frequency. Can be widely used as.
In addition, since the induction heating cooker of the present invention has excellent cooling reliability of the induction heating coil to be equipped, various induction heating cookers for home use and business use with high reliability, and various induction heatings not limited to cooking. It can be widely used as a device.

Sectional drawing etc. which show typically the induction heating coil which concerns on Embodiment 1 of this invention. The perspective view etc. which explain the induction heating coil which concerns on Embodiment 2 of this invention. The fragmentary sectional view etc. which explain the induction heating coil shown in FIG. Sectional drawing explaining the induction heating coil which concerns on Embodiment 3 of this invention. The fragmentary sectional view explaining the induction heating coil which concerns on Embodiment 4 of this invention. Sectional drawing explaining the induction heating coil which concerns on Embodiment 5 of this invention. The fragmentary sectional view explaining the induction heating coil which concerns on Embodiment 6 of this invention. The fragmentary sectional view explaining the induction heating coil which concerns on Embodiment 7 of this invention. The fragmentary sectional view explaining the induction heating coil which concerns on Embodiment 8 of this invention. The perspective view which shows an example of the induction heating cooking appliance which concerns on Embodiment 9 of this invention. The side view which shows an example of the induction heating cooking appliance which concerns on Embodiment 9 of this invention.

Explanation of symbols

  1: winding (coil conductor), 2w: gap, 3: cylindrical vent, 3w: vent vent, 4: covering, 6: coil base, 6w: coil base vent, 7: air duct 8: Middle plane, 10: Main body case, 11: Holding frame, 12: Top plate, 13a: Placement portion display, 13b: Placement portion display, 13c: Placement portion display, 14: Object to be heated, 15: Outside air inlet, 21: front panel, 22: operation unit, 23: roaster, 61: center hole, 62: inner surface, 63: bottom surface, 64: outer surface, 100: induction heating coil (first embodiment), 200: induction Heating coil (Embodiment 2), 203: Cylindrical vent, 203c: Winding hole, 203w: Ventilator vent, 300: Induction heating coil (Embodiment 3), 303: Planar vent, 303w: Ventilator vent 400, induction heating coil (Embodiment 4), 40 : Rod-shaped aeration body, 403w: ventilation body ventilation hole, 500: induction heating coil (Embodiment 5), 503: cylindrical rib, 503w: rib ventilation hole, 506: coil base, 563: bottom surface, 563w: passage through coil base Pore, 600: induction heating coil (sixth embodiment), 603: rod-shaped spacer, 700: induction heating coil (seventh embodiment), 705: rod-shaped rib, 706: coil base, 763: bottom surface, 800: induction heating coil (Embodiment 8), 900: Induction heating cooker (Embodiment 9).

Claims (5)

An induction heating coil having a wound portion in which a coil conductor is wound in a plurality of stages in the axial direction to form one layer, and the one layer is wound in a plurality of layers in the radial direction to form a cylindrical shape,
A cylindrical ventilation body is provided that has a ventilation hole that surrounds the layers and is ventilated in the axial direction between each of the plurality of layers or for each predetermined number of layers. An induction heating coil characterized by comprising: The winding portion includes an annular bottom surface, an inner surface perpendicular to the bottom surface formed along the inner periphery of the bottom surface, and an outer surface perpendicular to the bottom surface formed along the outer periphery of the bottom surface. Stored in the coil base,
The induction heating coil according to claim 1, wherein a coil base ventilation hole is formed in at least one of the bottom surface, the inner surface, and the outer surface . The induction heating coil according to claim 2, further comprising an air duct that supplies air to a ventilation hole formed in the coil base .   A top plate on which the cooking container is placed;
  The induction heating coil according to any one of claims 1 to 3, which is disposed immediately below the top plate;
  A heating control unit for controlling a high-frequency current supplied to the induction heating coil;
An induction heating cooker characterized by comprising:   5. The induction heating cooker according to claim 4, further comprising cooling means for supplying air to the induction heating coil.

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