JP2013008518A - High frequency induction heating coil, high frequency induction heating unit, and high frequency induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency induction heating device that reduces heating unevenness by reducing variation in level of an induced current of a high frequency induction heating coil used for the high frequency induction heating device, and making the quantity of variation in a heating state due to load variation small.SOLUTION: The high frequency induction heating device uses the high frequency induction heating coils which are arranged in a wave shape partially or entirely on a forward path from one end side to the other end side, folded back at the other end side, and arranged in a wave shape partially or entirely on the return path while crossing the coil on the forward path. A plurality of unit coils each comprising a coil on the forward path and a coil on the return path are connected in series and arranged side by side in a horizontal or vertical direction. Then a high frequency power supply device 8 is connected to the high frequency induction heating coils 90a, 90b to supply high frequency currents.

Description

  The present invention relates to a high-frequency induction heating coil, a high-frequency induction heating unit, and a high-frequency induction heating device that are used in, for example, a canned heating device that heats a filled and sealed can in a short time.

As a conventional canned heating device, a high-frequency induction heating unit, which is a high-frequency induction heating means using induction heating coils, is arranged on both sides in the traveling direction of a conveying means that continuously conveys canned products in an upright state. There is known a high frequency induction heating apparatus that heats each can that is moving along a high frequency induction heating unit on both sides in the traveling direction (see, for example, Patent Document 1).
FIG. 13 shows a schematic side view of a conventional canned heating apparatus. In the canned heating apparatus of FIG. 13, a screw 51 which is a can supply means for supplying each can 52 to the conveyance path 53 at a constant interval, and a flat belt which conveys each can 52 along the conveyance path 53 at a constant speed. And a rotational force applying means 56 that is a thin flat belt that rotates each can 52 in contact with each can 52 that is transported along the transport path 53. A plurality of induction heating coils 57 of a high-frequency induction heating unit that is a high-frequency induction heating unit disposed on one side or both sides of the conveyance path 53 are arranged in series along the conveyance path 53. An electric system 58 from the power switch to the induction heating coil is individually installed for each induction heating coil 57 arranged in series.

  FIG. 14 shows a partial plan view of a canned heating apparatus using a conventional high-frequency heating apparatus. A state in which the can 52 is conveyed at a constant speed while rotating on the conveying means 54 is indicated by a white arrow. The path of the can 52 is regulated by a pair of side guides 59, and is conveyed from the right side to the left side of the sheet of FIG. 14 by a flat belt which is a conveying means 54 between the pair of side guides 59. The conveying means 54 has a protrusion 54a, and the can 52 moves between the side guides 59 while being pushed by the protrusion 54a. The rotational force applying means 56 is a thin flat belt, is in contact with the bottom surface of the can 52, moves in the opposite direction to the conveying means 54, and applies a rotational force to the can 52. As a result, the can 52 moves from the right side to the left side in FIG.

The can 52 generates heat by generating an eddy current by the induction heating coil 57. Since the can 52 moves while rotating on the conveying means 54, the portion approaching the induction heating coil 57 sequentially generates heat according to the rotation.
It should be noted here that the can 52 has a cylindrical shape. The distance between the outer periphery of the can 52 and the induction heating coil 57 is different from W1, W2, and W3 as shown in FIG. A portion near the induction heating coil 57 generates heat strongly, and a portion far from the coil heats weakly. For this reason, the speed of the conveying means 54 is decreased, the rotation of the can 52 is increased, and the outer periphery of the can 52 is heated. However, the conveying means 54 is temporarily stopped and the can 52 is rotated once. It cannot be heated.

  FIG. 15 shows a cross-sectional view of a conveyance path 53 of a conventional canned heating apparatus. Each of the induction heating coils 57 is one in which the induction heating coil main body 57a is accommodated in a non-magnetic case 57b such as an epoxy resin, and the side of the induction heating coil 57 facing the can 52 of the case 57b is It is covered with a relatively thin cover plate 57c. The main body 57a of the induction heating coil 57 is such that a conductive wire 572 is coiled around a ferrite core 571. By passing a current through the conductive wire 572, the induction heating coil 57 is passed through the cover plate 57c of the case. The can 52 passing in the vicinity of is heated by Joule heat based on an induced current (eddy current) generated in a metal can. And the content drink is heated via this can container, and the whole canned food 52 is heated.

Conventionally, a plurality of induction heating coils 57 in which conductive wires 572 are coiled around a ferrite core 571 are arranged in series, or after one induction heating coil is wound in a spiral or spiral shape, It was wound in a spiral or spiral shape.
In high-frequency induction heating, a spiral coil (for example, see Patent Document 2) or a spiral coil is known (for example, see Patent Document 3). Spiral coils and spiral coils can be induction-heated relatively uniformly when the surface to be heated has a shape similar to the coil shape, such as a cylinder or disk. If the plate is to be guided by a circular coil, the four corners are not close to the coil, and it is difficult to generate heat. That is, in the case of a derivative such as a quadrangle and a rectangle, there are many portions that do not face the coil, which causes heating unevenness.

FIG. 16 shows a side view of the helical coil 572. Since both the spiral coil and the spiral coil have a circular shape, a portion (A portion in FIG. 16) where the surface to be heated is not opposed to a derivative to be heated such as a quadrangle is generated, which is a major cause of heating unevenness. Although it is possible to wind a coil in a quadrangular shape, the magnetic flux concentrates in the central portion, so that the difference from the peripheral portion with a small magnetic flux often causes uneven heating.
In addition, when the number of turns is increased, the magnetic flux becomes stronger, but if the magnetic flux is strong, the spiral coil / spiral coil does not want to be heated. Control may be difficult due to the phenomenon that a large current is induced.

17 and 18 show a case where spiral coils and spiral coils are aligned and connected in series so as to correspond to a rectangle that becomes a heating region. FIG. 17 shows a side view when a conventional single winding high frequency induction heating coil is connected in series, and FIG. 18 shows a side view when a conventional double winding high frequency induction heating coil is connected in series. .
In FIG. 17 and FIG. 18, the direction of the current flowing through the coil at a certain moment is indicated by a broken arrow because a high-frequency current flows through the coil and the direction of the current changes. For example, in FIG. 17, the current that flows as indicated by arrow B follows the shape of the coil and flows downward as indicated by arrow C, and then flows upward as indicated by arrow D. Since the coil flows while drawing a loop, when the loops are adjacent to each other, the flow of the arrow C pointing downward on the paper surface and the flow of the arrow D pointing upward on the paper surface are close to each other. The same applies to FIG. Thus, if the direction of the current is opposite, each coil weakens the induced current caused by the other coils. This tendency has the disadvantage that it does not change even if the number of turns of the coil is increased.

  In addition, when spiral coils or spiral coils are used side by side and connected in series, a coil member including an inductance component is necessary for the connection between the coils, and the coil wire length becomes long and the inductance component of the entire coil is also reduced. Will be affected. In a coil having a large number of windings and a high induction coefficient, there is a drawback in that when the load as a derivative is changed, the induced current is likely to change, and the difference in the heating state due to the load change is likely to occur.

Japanese Patent No. 3755630 JP 11-77835 A Japanese Patent No. 4613425

  In the present invention, it is a first object to provide a high frequency induction heating coil, a high frequency induction heating unit, and a high frequency induction heating device that can bring a coil close to a portion where the coil cannot be approached by the conventional winding method and reduce heating unevenness. It is aimed. The second object is to shorten the coil wire length with the same performance as that of a spiral or spiral coil connected in series. Thirdly, it is intended to make it difficult to cause an abnormal induction phenomenon to an unintended end portion of the derivative. Fourthly, even if the load increases or decreases, the change in the magnitude of the induced current is small, and the object is to reduce the amount of change in the heating state with respect to the load fluctuation.

  The high-frequency induction heating coil of the present invention is configured such that a part or all of the outward coil from one end side to the other end side is disposed in a wave shape, the outward coil is folded at the other end side, and the other end side is Using the high-frequency induction heating coil in which a part or all of the coil of the return path folded up to one end side is wave-shaped and crossed with the coil of the outbound path, the outbound coil and the inbound path coil reciprocated once. With a minute as one unit, a plurality of units of coils are connected in series so as to be arranged in the horizontal direction or the vertical direction.

  This greatly reduces heating unevenness. Further, the coil wire length can be shortened with the same performance as that of a series connection of spirals and spiral coils. It is possible to make it difficult for an abnormal induction phenomenon to an unintended end portion of the derivative to occur. Even if the load increases or decreases, the change in the magnitude of the induced current is small, and the amount of change in the heating state with respect to the load variation can be reduced.

The high-frequency induction heating coil of the present invention is disposed with a space provided between the coils at each intersection where the return coil and the forward coil overlap.
As a result, even when a high frequency induction heating coil having no insulating film on its surface is used, the high frequency induction heating coil does not contact at the intersection and an unexpected current does not flow.

The high-frequency induction heating coil according to the present invention is arranged with an insulating spacer interposed between coils at each intersection where the return coil and the forward coil overlap.
As a result, the coils at the intersections of the high-frequency induction heating coils can be separated from each other by a certain distance, and the derivative such as canned food can be stably heated.

The high-frequency induction heating coil according to the present invention is configured such that the forward coil from one end side to the other end side is arranged in a wave shape, the forward coil is folded at the other end side, and the return coil is folded from the other end side to the one end side. As a wave shape intersecting with the forward coil, ∞ is continuous.
As described above, in the present invention, the high-frequency induction heating coil is arranged so that the shape of ∞ is continuous, thereby greatly reducing heating unevenness.

  In the high-frequency induction heating coil of the present invention, the waveform of the coil is a sine curve wave, an arc-shaped wave, a bent line-shaped wave, or a combination of any two or more of these waves. This reduces heating unevenness and makes it easy to manufacture a high-frequency induction heating coil.

  In the high frequency induction heating unit of the present invention, a high frequency power supply device is connected to the above-described high frequency induction heating coil, and a high frequency current is supplied. Thus, a to-be-derivatized product such as canned food can be stably heated with the high-frequency power supply device using the above-described high-frequency induction heating coil.

  Moreover, in the high frequency induction heating device of the present invention, there is provided a heating object conveying means for conveying the heating object along the high frequency induction heating coil of the above-described high frequency induction heating unit, and the heating object is heated while the heating object is being conveyed. It is configured to heat the object. This achieves uniform heating while moving the object to be heated.

  The high-frequency induction heating coil, high-frequency induction heating unit, and high-frequency induction heating device of the present invention have an effect of greatly reducing heating unevenness. In addition, the spiral coil and the spiral coil tend to have a higher number of windings (turns) and a higher partial magnetic flux density than the derivative, but the high-frequency induction heating coil and high-frequency induction heating of the present invention. Units and high-frequency induction heating devices can be shorter than conventional coils, the magnetic flux density to the derivative is less likely to be dense, the induction coefficient is lower, and local heating is also reduced. Abnormal induction phenomenon to the part is hard to occur. Even if the load increases or decreases, there is an effect that the change in the magnitude of the induced current is small and the amount of change in the heating state with respect to the load variation is small.

  In particular, when the surface to be heated of the derivative to be heated is rectangular, the portions that are not physically opposed in the series connection of the spiral coil or the spiral coil are reduced, and there is a large heating unevenness improvement effect.

The schematic side view of the canned heating apparatus using the high frequency induction heating apparatus concerning 1st embodiment of this invention. The figure which showed schematic structure of the high frequency induction heating apparatus concerning 1st embodiment of this invention. (A) A diagram showing a single unit of high frequency induction heating coil in which the forward coil and the return coil according to the first embodiment of the present invention reciprocate once, separated from each other. (B) FIG. The figure which shows the state which connected the high frequency induction heating coil of two units concerning one embodiment in series (c) It is a high frequency to the high frequency induction heating coil of two units connected in series concerning the first embodiment of this invention. The figure which shows the state which connected the power supply device and was set as one high frequency induction heating unit. The perspective view which showed the positional relationship of the high frequency induction heating unit concerning 1st embodiment of this invention, and the conveyance path | route of a heating target object. The fragmentary sectional view of the canned heating apparatus using the high frequency heating apparatus concerning 1st embodiment of this invention. (A) Side view of a modification of the high frequency induction heating coil according to the first embodiment of the present invention (b) Side view of a modification of the high frequency induction heating coil according to the first embodiment of the present invention (c) ) Side view of a modification of the high frequency induction heating coil according to the first embodiment of the present invention. The perspective view of the high frequency induction heating unit concerning 1st embodiment of this invention. The perspective view which showed the position of the conveyance path | route of the other high frequency induction heating unit and heating target concerning 1st embodiment of this invention. The perspective view of the other high frequency induction heating unit concerning 1st embodiment of this invention. The perspective view of the high frequency induction heating unit concerning 2nd embodiment of this invention. (A) The figure which showed the direction of the electric current which flows into the high frequency induction heating coil concerning 2nd embodiment of this invention (b) The direction of the electric current which flows through the high frequency induction heating coil concerning 2nd embodiment of this invention FIG. The figure which showed the structure of the other high frequency induction heating unit concerning 2nd embodiment of this invention. The schematic side view of the canned heating apparatus using the conventional high frequency heating apparatus. The partial top view of the canned heating apparatus using the conventional high frequency heating apparatus. The fragmentary sectional view of the canned heating apparatus using the conventional high frequency heating apparatus. The side view of the conventional high frequency induction heating coil. The side view when the conventional single winding high frequency induction heating coil is connected in series. The side view when the conventional double winding high frequency induction heating coil is connected in series.

  In the high-frequency induction heating coil and the high-frequency induction heating apparatus using the same according to the present invention, the coil is arranged in a wave shape from one end, folded back at the other end, and a coil having a continuous ∞ character in side view (hereinafter, ∞ Called a coil). With respect to this ∞ coil, a plurality of units of coils are arranged in series so as to be aligned in the horizontal direction or the vertical direction, with one round trip of the forward coil and the backward coil as one unit.

  In this way, the current flow in the vicinity of the intersection of the first-layer high-frequency induction heating coil extending from one end to the other end and the second-layer high-frequency induction heating coil extending from the other end to one end intersects. Thus, the magnetic field can be strengthened. It is possible to realize a chain of small current rings connected in a chain. Therefore, as shown in FIGS. 17 and 18, the current does not flow in the opposite direction in the portion where the high frequency induction heating coil is adjacent, and the magnetic field is not canceled out. And the area | region where the intensity | strength of the line of magnetic force was extremely strengthened decreased, and the area | region where the intensity | strength of the line of magnetic force was extremely weakened also decreased. As a whole, the strength of the magnetic field lines is averaged, and uniform high frequency induction heating is performed in a wide area. As a result, the coil wire length can be shortened with the same performance as that of a spiral or spiral coil connected in series.

  When the heated surface of the derivative is rectangular, the length of the long side is set to the wave height of the opposing coil, and the coil is continued in a wave shape until the length of the long side of the heated surface can be accommodated. The wavelength can be examined depending on the application, but is typically about twice the wave height. The shape of the arc-shaped wave, that is, the wave shape is not only a sine curve, but also a wave shape in which a circle and a circle are close to each other and continuous, a wave shape that is connected by a straight line that crosses the circle and the circle, or a triangular wave or a rectangle It may be a wave and its partial deformation is possible. In addition, deformation (position adjustment) in the direction orthogonal to the surface to be heated, angle adjustment of the adjacent (crossing) part of the coil, and position adjustment in the orthogonal direction are intended to improve heating unevenness or intentionally increase or decrease the heating intensity. Is also effective. At the other end, it is folded back so that the corrugation is arcuate. When the surface to be heated is an ellipse or a special shape, it can be dealt with by partially changing the shape and wave height of the coil.

(First embodiment)
FIG. 1 shows a schematic side view of a canned heating apparatus as a first embodiment of the high-frequency induction heating apparatus of the present invention. The basic configuration shown in FIG. 1 is the same as that of the conventional canned heating apparatus shown in FIG. 13, and the same parts are denoted by the same reference numerals and description thereof is omitted. FIG. 2 shows a schematic configuration of the high-frequency induction heating device according to the first embodiment of the present invention. In FIG. 2, the heating object conveyance means which conveys the heating object of the high frequency induction heating apparatus of this invention is simplified by the arrow (X), and the high frequency induction heating unit 9 is also simplified.

  In the high frequency induction heating apparatus of the present invention, the high frequency induction heating coils 90a and 90b are arranged so as to be undulated by a plurality of wavelengths from one end to the other end in the longitudinal direction, like the high frequency induction heating unit 9 shown in FIG. It is folded up near the other end, and is arranged so as to be undulated for a plurality of wavelengths from the other end to the one end with the same wavelength. A single unit of the reciprocating coil of the forward coil and the return coil is arranged in series so that a plurality of coils, that is, the high-frequency induction heating coils 90a and 90b are aligned in the horizontal direction or the vertical direction. is doing. In FIG. 2, two units of coils 90 a and 90 b are arranged in the same plane of the paper surface. However, the two units of coils may be arranged vertically to the paper surface. When two units of coils 90a and 90b are set up perpendicular to the paper surface and a heated object such as a can is conveyed in the direction of the arrow (X) between them, high-frequency induction heating can be performed from both sides of the heated object.

  In FIG. 2, the coil length of one unit coil is represented by (K1), the coil length of another unit coil is represented by (K2), and the coil pitch (wavelength) is represented by (P1), (P2), (P3) and (P4). Wave heights are indicated by (H1) and (H2). The distance between the two unit coils is indicated by (Bh). As these parameters of the coil length (K), pitch (P), wave height (H), and coil interval (Bh), optimum values are selected according to the size of the heating object and the heating temperature. The wave pitches P1, P2, P3, etc. may all be the same pitch or different pitches. This is because, when various pitches are mixed, various shapes of magnetic fields can be generated and the object to be heated can be heated uniformly.

In FIG. 2, a high-frequency power supply device 8 is connected to the end of the high-frequency induction heating coil 90a, and a high-frequency current is applied so that it can be used as one high-frequency induction heating means. When two units of the high-frequency induction heating coils 90a and 90b are arranged in parallel with a space between them and a conveying means is provided between them and the can 52 is conveyed while being rotated, an eddy current flows through the can 52 and heat is generated.
The configuration of the present invention will be described with reference to FIGS. 3 (a), (b) and (c). In the present invention, as in the high-frequency induction heating coil 90a or 90b in FIG. 3A, all of the outward coils are arranged in a wave shape from one end side to the other end side, and the outward coil is folded at the other end side. From the other end side to the one end side, for the high-frequency induction heating coil that is arranged in a wave shape and intersects with the outward coil from the other end side to the one end side, the amount of reciprocation between the outward coil and the return coil is one One unit.

  Here, as shown in FIG. 3 (a), when the high frequency induction heating coils 90a and 90b as one unit are disconnected and the high frequency power supply device 8 is connected to each unit and the high frequency power is supplied, the high frequency induction heating coil 90a is provided. And 90b oscillation timing cannot be controlled uniformly. The direction of the current flowing through the high-frequency induction heating coils 90a and 90b is the same, reverse, or slightly shifted, and the induced magnetic field becomes stronger or weaker, resulting in uniform heating. Can not.

Therefore, as shown in FIG. 3 (b), as the high frequency induction heating coil of the present invention, high frequency induction heating coils 90a and 90b, which are coils of a plurality of units, are arranged in series so as to be aligned in the horizontal direction or the vertical direction. .
As shown in FIG. 3 (c), the high frequency induction heating unit of the present invention is configured such that a high frequency power supply device 8 is connected to the high frequency induction heating coil of the present invention to supply a high frequency current. Thus, the high-frequency induction heating coils 90a and 90b oscillate in a unified manner by supplying high-frequency power from one high-frequency power supply device 8.

In the present invention, a conveying means for conveying a heating object as shown by an arrow (X) is provided between the high-frequency induction heating coils 90a and 90b of the high-frequency induction heating unit configured as shown in FIG. A high-frequency induction heating device is configured to heat the object to be heated while the object is being conveyed.
In the present invention, the high frequency induction heating coils 90a and 90b arranged as shown in FIG. 2 can be energized by the single high frequency power supply device 8, so that a large number of high frequency power supply devices 58 are provided as in the conventional example shown in FIG. There is an advantage that it is not necessary to provide.

FIG. 4 is a perspective view showing the positional relationship between the high-frequency induction heating unit according to the first embodiment of the present invention and the conveyance path of the heating object.
At the positions where the high-frequency induction heating coils 90a and 90b intersect the forward path and the return path in a side view, the forward coil and the return coil of the high-frequency induction heating coil are spaced apart in the depth direction. In order to separate the forward coil and the return coil of the high frequency induction heating coil, a space may be provided, or an insulating spacer may be interposed. FIG. 4 shows an example in which a space is provided between the forward coil and the return coil of the high-frequency induction heating coil.

  In the portion where the high frequency induction heating coils 90a and 90b intersect and overlap each other, the direction of the current intersects in the same direction in the vertical direction. For this reason, since the directions of the currents intersect in the same direction, the magnetic field is strengthened, and the eddy current generated in the derivative is increased. As a result, the high-frequency induction heating coils 90a and 90b are efficiently and sufficiently heated at the portion where each of the high-frequency induction heating coils 90a and 90b intersects and overlaps at a predetermined angle. Further, since a plurality of unit coils are connected in series to one high frequency power source 8, the direction of the current flowing through each unit coil varies according to one high frequency power source 8. When each high frequency power supply 58 is connected to each high frequency induction heating coil 57 as in the conventional example of FIG. 13, the oscillation cycle of the high frequency power supply cannot be controlled uniformly. Since the unit coils are connected in series, the direction of the current flowing through the coil of each unit can be controlled uniformly.

  The fact that the direction of the current is not reversed is a point that differs greatly from the winding method of the conventional high-frequency induction heating coil shown in FIGS. In the conventional method of winding the coil shown in FIG. 17, the current direction is opposite in the vertical direction and the magnetic field is canceled at the position adjacent to the coil. For this reason, the eddy current generated in the derivative is extremely weak and is not sufficiently heated. The present invention has a specific effect that the derivative is efficiently and sufficiently heated at the intersecting and overlapping portions in each of the high-frequency induction heating coils 90a and 90b.

In FIG. 4, the coil case of the high frequency induction heating unit according to the first embodiment of the present invention is omitted, and only the high frequency induction heating coils 90a and 90b and the high frequency power supply device 8 are shown in a perspective view.
In FIG. 4, a plurality of high-frequency induction heating coils 90a and 90b are positioned on a pair of parallel planes spaced from each other. And the conveyance path | route of the heating target object is provided like the arrow (X) between the some high frequency induction heating coils 90a and 90b. The direction of the current flowing through the first layer coil (L1) and the second layer coil (L2) from the front of the high frequency induction heating coil 90a is opposite, and the third layer coil of the high frequency induction heating coil 90b spaced apart from each other. (L3) and the direction of the current flowing through the fourth layer coil (L4) are also opposite. When the object to be heated is conveyed as indicated by an arrow (X), induced currents flow in different directions in the object to be heated and are heated uniformly.

  FIG. 5 shows a partial cross-sectional view of a canned heating device using the high-frequency heating device according to the first embodiment of the present invention. Actually, for the purpose of heating the cylindrical container, a coil unit having an effective area of 750 mm × 95 mm was created and experimented. Using a φ4mm copper tube, the wave height was 90mm and the wavelength was about 220mm. The cylindrical container is designed to move and rotate along the coil unit while rotating, but it is a unit that uses seven conventional circular coils with the effective diameters of 90mm and 70mm that are made for exactly the same purpose. In comparison with the above, there was an increase in the heating width especially above and below the coil, and improvement in heating unevenness was confirmed.

  As can be seen by comparing the winding method of the coil of FIG. 4 of the present invention and the winding method of FIG. 17 of the conventional example, when the reciprocal portion of the coil of FIG. 4 is compared with the corresponding coil portion of FIG. It will be appreciated that the high frequency induction heating coil of the invention is short. If the total length of the high frequency induction heating coil is short, there is no waste of the high frequency induction heating coil, and even if there is a load fluctuation of the derivative, there is little change in the magnitude of the induced current, and the amount of change in the heating state with respect to the load fluctuation is small. It is running low.

  Although not shown in the drawings, the high frequency induction heating coil often uses a hollow tube to flow water through the inside cavity to cool the high frequency induction heating coil, but FIG. 4 of the present invention and FIG. 17 of the conventional example. As you can see, the cavity of the high-frequency induction heating coil is not a loop, but is mostly wavy, so it has the advantage of being easy to flow and cool. is there.

Incidentally, in the above, a φ4 mm copper tube, that is, a hollow coil is exemplified as the high-frequency induction heating coil, but if necessary, a solid coil as a high-frequency induction heating coil, a hollow wire coated with an insulator, or an insulation A solid coil covered with a body may be used.
Further, in the above, an example is shown in which all of the forward coils from one end side to the other end side are arranged in a wave shape, and all of the return coils from the other end side to one end side are arranged in a wave shape. A part of the coil may be arranged in a corrugated shape, and a part of the return coil from the other end side to the one end side may be arranged in a corrugated form. FIG. 6A shows a modified example in which a part, not all, of the coil is arranged in a waveform. In the high frequency induction heating coil 91a shown in FIG. 6A, the corrugated portion and the straight portion are connected together. In this way, by making a part of the shape non-corrugated, the amount of heat generated in the region can be set to an arbitrary value different from the amount of heat generated in the corrugated region.

  Further, FIG. 6B shows an example in which a substantially linear high-frequency induction heating coil 92a is bent and arranged. From one end to the other end, a substantially linear coil is folded and placed in a corrugated shape, and the other end is folded back into an arc shape. Try to be continuous.

  In FIG. 6 (c), a high frequency induction heating coil is formed in which an insulative spacer is sandwiched between coils at each intersection where the folded return coil and the forward coil overlap each other, so that the letter ∞ continues. Reference numeral 19 denotes an insulating spacer. By interposing the insulator spacer 19 between the coils at each intersection where the folded high-frequency heating coil 93a overlaps, the mutual influence is suppressed so that the magnetic field does not become extremely strong or weak at each intersection where the coils 93a overlap. Thus, the peak of the magnetic field is suppressed, and the heat generation temperature of the object is averaged.

In the above description, the case where the coil is on one plane has been described. However, if necessary, the coil may be on a curved surface curved with an arbitrary curvature, or on an uneven surface where the plane and the curved surface are mixed. May be.
In FIG. 4, the front high frequency induction coil and the back high frequency induction coil are connected in series to one high frequency power supply 8. As a result, the current flowing in the high-frequency induction coil of the first layer (L1), the second layer (L2) of the high-frequency induction heating coil 90a, the third layer (L3) of the high-frequency induction heating coil 90b, and the fourth layer (L4). Each direction can be reversed. And a heating target object can be uniformly heated by conveying a heating target object in the conveyance direction shown by arrow (X) between the front high frequency induction coil 90a and the back high frequency induction coil 90b.

  In FIG. 7, the arrow (X) in the conveyance direction of the heating object is not written, but this figure may be used as one high frequency induction heating unit. As described above with reference to FIG. 2, the coil length (K), the corrugated pitch (P), the interval (Bh) of the high frequency induction coil, and the wave height (H) are arbitrarily set as necessary. The whole may be used as one high frequency induction heating unit. The pitch of the front high frequency induction coil may be different from the pitch of the back high frequency induction coil, or the pitch of adjacent high frequency induction coils may be increased or decreased.

  Moreover, you may provide the conveyance path | route of a heating target object as a high frequency induction heating unit of the form which made the space | interval (Bh) of the high frequency induction coil approached extremely outside the high frequency induction coil. As a high-frequency induction heating unit in which the interval (Bh) between the high-frequency induction coils is further widened, a plurality of rows of heating object conveyance paths may be provided. As the pitch (P), interval (Bh), and wave height (H) of the high frequency induction coil, optimum values can be selected as necessary.

  By changing the winding method of the high-frequency induction coils so that the high-frequency induction coils are close to each other (Bh) so that the high-frequency induction coils do not overlap, the direction of the current flowing through the adjacent high-frequency induction coils can be disturbed. . When the direction of the current flowing through the high frequency induction coil is disturbed, the magnetic flux generated in the space around the coil is strengthened in the space region where the direction of the current flowing in the coil is the same direction, and the magnetic flux is strengthened in the space region flowing in a different direction. Weaken each other. And the distribution of the lines of magnetic force generated around the coil is disturbed in a fine region. As a result, the region where the strength of the magnetic field lines is extremely increased is reduced, and the region where the strength of the magnetic field lines is extremely weakened is also reduced. As a whole, the strength of the magnetic field lines is averaged, and uniform high frequency induction heating is performed in a wide area.

  FIG. 8 shows, as a modification of the high frequency induction heating unit shown in FIG. 4, a high frequency induction coil 90a for one reciprocation consisting of a first layer (L1) and a second layer (L2), a third layer (L3), and The case where the high frequency power supply device 8 is arranged in series between the high frequency induction coils 90b for one reciprocation consisting of the fourth layer (L4) is shown. In FIG. 9, the arrow (X) in the conveyance direction of the heating object is not written, but the wave-shaped pitch (P), the interval (Bh) of the high-frequency induction coil, and the wave height (H) are arbitrarily set as necessary. Then, the whole can be used as one high frequency induction heating unit as in the case of FIG.

  In the first embodiment, the high-frequency heating coil used in the canned heating apparatus has been described as an example. Therefore, although the example which has arrange | positioned the high frequency heating coil in planar shape is shown, according to the shape of a heating target object, you may arrange | position a high frequency heating coil along a concave surface or a convex surface. As for the wave height (H), if necessary, the case of high and low may be mixed, and the wave height (H) may be gradually increased or gradually decreased in the conveyance direction of the heating object. As described above, an optimum value can be selected as necessary for the value of the wave height (H).

  Further, when the coils are arranged in a wave form from one end to the other end, the wave pitch (wavelength) may be changed in the middle, and the coils may be arranged in a dense wave form. The amount of heat generation can be increased in a portion where the wavelength of the high frequency heating coil is short and the high frequency heating coil is dense, and the amount of heat generation can be decreased in a portion where the wavelength of the high frequency heating coil is long and the high frequency heating coil is sparse.

  In the first embodiment, the example is shown in which the waveform of the outward coil and the waveform of the return coil are the same. However, depending on the need for heat generation, a combination of different waveforms can be used. Alternatively, a combination of different wave forms in which the coil wave height and the coil wavelength are changed may be used.

(Second embodiment)
FIG. 10 is a perspective view of a high frequency induction heating unit according to the second embodiment of the present invention. In FIG. 10, three high frequency induction heating coils (that is, three units of coils) 94a, 94b, 94c are vertically moved on the same vertical plane, and Bv1, Bv2 are set as coil intervals. Decided and placed in adjacent positions. The three high-frequency induction heating coils positioned above and below are viewed as one wall, and the front of the wall is used as a conveyance path for the heating object.

  In FIG. 10, three high frequency induction heating coils 94a, 94b, 94c are connected in series and connected to the high frequency power supply 8 so that the currents of adjacent high frequency induction heating coils flow in the same direction. This is because if the currents of the high-frequency induction heating coils adjacent to each other flow in the opposite direction, the magnetic fields are canceled and weakened.

  In FIG. 10, the lower high frequency induction heating coil 94a (L1, L2), the middle high frequency induction heating coil 94b (L3, L4), and the upper high frequency induction heating coil 94c (L5, L6) are connected in series. It is connected to a high frequency power supply 8. Therefore, the current of the high-frequency induction heating coil close to the top and bottom flows in the same direction. When the currents of the high-frequency induction heating coils close to each other flow in the same direction, the magnetic field strengthens. 11 (a) and 11 (b) illustrate the current flow in the case of FIG. As shown in FIGS. 11 (a) and 11 (b), the direction of the current is the same in the vertical direction or the horizontal direction in the portion where the high frequency induction heating coils intersect and in the adjacent portion. Since the direction of the current is the same, the magnetic field is strengthened, and the eddy current generated in the derivative increases. As a result, the derivative is efficiently and sufficiently heated at the portion where the high-frequency induction heating coils intersect and overlap each other at a predetermined angle and the adjacent portions.

  The winding method of each high-frequency induction coil in the second embodiment is the same, but the direction of the current flowing through each high-frequency induction coil is increased while the current of the adjacent high-frequency induction heating coils flows in the same direction to strengthen the magnetic field. You can see that it is up and down, left and right and confused. As described above, in the second embodiment, since a large number of loop currents can be generated simultaneously on one plane, a large number of eddy currents are simultaneously generated on the surface of the heating object facing the high frequency induction coil. Arise.

If a heating target is conveyed in front of the high frequency induction heating coil positioned up and down on the same vertical plane as shown in FIG. 10, the heating target can be uniformly heated.
Note that the parameters of the coil length (K), pitch (P), coil interval (Bv), and wave height (H) shown in FIG. 10 have optimum values according to the size of the heating object and the heating temperature. The selection is the same as in the first embodiment. For example, as shown in FIG. 12, one pitch (P7) in one unit of coil 90b may be changed from the other (P1, P2, P3, etc.). This is because, by changing one pitch, not only that part but also the state of eddy current generated in the derivative by the high frequency induction heating coil connected to that part is changed.

  As described above, in the present invention, even when a plurality of high-frequency induction heating coils are arranged vertically on the same vertical plane, the currents of the high-frequency induction heating coils flow so as to flow in the same direction. Does not cancel out the magnetic field. In particular, when a high frequency current is supplied to a high frequency induction heating coil arranged vertically or horizontally with one high frequency power supply device, the currents of the adjacent high frequency induction heating coils are the same in the same direction without any special control. There is an effect that it can be made to flow.

  In the above description, an example has been described in which the coil of the forward path and the coil of the return path are arranged as a unit, and the coils of a plurality of units are arranged in series so as to be aligned in the horizontal direction or the vertical direction. A plurality of units of coils may be connected in series so as to be arranged in both the horizontal direction and the vertical direction. A plurality of units of coils may be arranged in series so as to be arranged in a radial pattern.

  The present invention can be applied to heating of a container containing a derivative sheet, induction heating of a hot plate or a mold used for hot plate welding, heating of a sheet derivative to be bonded, and the like.

DESCRIPTION OF SYMBOLS 8 High frequency power supply device 9 High frequency induction heating unit 90a, 90b, 91a, 92a, 93a, 94a, 94b, 94c High frequency induction heating coil 57a Induction heating coil main body 9b, 57b Case 9c, 57c Cover plate 19 Insulator (spacer)
51 Screw (canned food supply means)
52 Canned food 53 Support plate 54 Conveying belt (conveying means)
54a (Conveyor belt) protrusion 56 Rotating force applying belt (Rotating force applying means)
57 Induction heating coil 58 Electrical circuit (electrical system)
59 Side Guide 571 Ferrite Core 572 Conductive Wire

Claims (10)

A part or all of the outward coil from one end side to the other end side is arranged in a wave shape, the outward coil is folded at the other end side, and the return coil is folded from the other end side to the one end side. About a high frequency induction heating coil that is arranged in a wave shape with a part or all of the crossing with the forward coil,
A high frequency induction heating characterized in that a plurality of units of coils are arranged in series so as to be arranged in a horizontal direction or in a vertical direction, with one unit corresponding to one round trip of the forward coil and the return coil. coil.   2. The high frequency induction heating coil according to claim 1, wherein a space is provided between the coils at the intersections where the return coil and the forward coil overlap each other.   3. The high frequency induction heating coil according to claim 1, wherein an insulating spacer is interposed between coils at each intersection where the return coil and the forward coil overlap each other. Place the forward coil from one end side to the other end side in a wave shape,
Fold the outward coil at the other end side,
4. The ∞ character is continuous from the other end side to the one end side as a wave shape in which the coil of the return path is crossed with the coil of the forward path. High frequency induction heating coil.   The high frequency induction heating coil according to any one of claims 1 to 4, wherein a wave shape of the coil is a sine curve wave.   The high frequency induction heating coil according to any one of claims 1 to 4, wherein a wave shape of the coil is a circular wave.   The high frequency induction heating coil according to any one of claims 1 to 4, wherein a wave shape of the coil is a bent linear wave.   5. The high frequency induction according to claim 1, wherein the wave shape of the coil is a wave that is a combination of two or more of a sine curve wave, an arcuate wave, or a bent line wave. Heating coil.   A high frequency induction heating unit configured to connect a high frequency power supply device to the high frequency induction heating coil according to any one of claims 1 to 8 and to energize a high frequency current.   A heating object conveying means for conveying the heating object along the high frequency induction heating coil of the high frequency induction heating unit according to claim 9 is provided, and the heating object is heated while the heating object is being conveyed. Configured high-frequency induction heating device.