JP4269491B2 - Induction heating device for beverage cans - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating apparatus for a beverage can that heats a beverage can such as coffee.
[0002]
[Prior art]
7 shows a configuration diagram of a conventional example, FIG. 8 (a) is a front view of FIG. 7, and FIG. 7 (b) is a sectional view taken along line AA of FIG. 7 and 8, 1 is a cylindrical heating coil, 3 is a driving roller for driving the beverage can 2, 4 is a presser roller for pressing the beverage can 2, and 5 is an inverter for supplying high-frequency current to the heating coil 1. Show. 7 and 8, the heating coil 1 is formed in a cylindrical shape and closely wound, and the driving roller 3 for driving the beverage can 2 and the presser roller 4 are arranged at both ends of the beverage can 2. In FIG. 7 and FIG. 8, the beverage can 2 is placed on the drive roller 3 while being laid sideways, and a high-frequency current is supplied from the inverter 5 while being rotated by the rotational force applied by the drive roller 3 and the pressing roller 4. Inductive heating is linked to the magnetic flux of the heating coil 1.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional structure, since the magnetic flux by a heating coil is linked with a drink can, and circulates through the back side of a heating coil, there exists a problem which carries out local heating of the metal components near a heating coil.
Also, since rollers that support and drive the beverage can can only be deployed at both ends of the beverage can, a mechanism component is required to keep the beverage can horizontal when the beverage can is laid sideways and inserted into the heating coil. There is a problem.
[0004]
In addition, the inductance varies due to variations in the winding method of the coil, but this variation cannot be corrected by the coil itself, and there is a problem that the inverter must deal with.
This invention was made in order to solve the above-mentioned problem, and its purpose is to eliminate local heat in the vicinity of the heating coil, reduce the mechanical parts when installing the beverage can in the heating coil, An object of the present invention is to provide an induction heating device for a beverage can in which the inductance can be adjusted by the heating coil itself.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, in an automatic vending machine induction heating apparatus 1 for heating a can of beverage, the heating coil has a plurality of turns, formed into a cylindrical shape having a gap in a predetermined position in the axial direction It is characterized by doing. By providing a beverage can drive roller in a gap provided at a predetermined position in the axial direction of the heating coil with the above configuration, the interval for supporting the beverage can can be made half or less of the length of the beverage can. When the can is laid down and mounted in the heating coil, the beverage can is supported substantially horizontally by the drive roller, and the mounting of the beverage can in the heating coil can be completed without any trouble.
[0006]
In addition , in the beverage can induction heating device, the heating coil can be provided with ferrite forming an external magnetic path. With the above configuration, since the magnetic flux on the back side of the heating coil circulates in the ferrite, there is no leakage magnetic flux, and it becomes possible to prevent local heat of the metal parts near the heating coil.
[0007]
In addition , in the beverage can induction heating device, the inductance of the heating coil can be adjusted by adjusting the length of the gap on the magnetic circuit where the magnetic flux generated by the heating coil circulates and the ferromagnetic part. In the beverage can induction heating device, the length of the gap on the magnetic circuit and the ferromagnetic portion may include a plurality of adjusting ferrites provided along the circumferential direction inside the heating coil in the axial direction. You may make it adjust by making it slide to.
[0008]
Here, the inductance of the heating coil will be described with reference to FIG. In FIG. 3, the heating coil has a ferromagnetic magnetic path in which the back surface and the front and rear ends are surrounded by a U-shaped ferrite, and the adjusting ferrite 7a (approximately 3 / 4) and 7b (for the sake of illustration, the ferrite covering the entire inner surface of the coil is shown).
[0009]
When the entire length of the inner surface of the coil is covered like the adjustment ferrite 7b, the heating coil 1A is surrounded by the ferrite, and all the magnetic flux circulates in the ferrite. Further, when the adjusting ferrite is set to 7a, the magnetic flux Φ induced by the heating coil circulates through the can through the adjusting ferrite 7a, and then returns to the can through the U-shaped ferrite forming the back magnetic circuit. Circulate the road. Here, the inductance of its length to a portion of adjustment ferrite 7a is not inserted between the air gap and a L _a heating coil L = N / Rm (1)
Rm = 1 / μ ₀ (L _f / (μ _f · S) + L _a / S) (2)
N: Number of coil turns Rm: Magnetic resistance μ ₀ : Vacuum permeability L _f : Adjusted ferrite length μ _f : Ferrite relative permeability L _a : Air gap length S: Expressed in cross section of adjusted ferrite .
[0010]
Therefore, the inductance can be increased by increasing the length of the adjusting ferrite, the inductance can be decreased by decreasing the length of the adjusting ferrite, and the inductance can be reduced by the length of inserting the adjusting ferrite into the coil. It can be seen that it can be adjusted. Therefore, the inductance of the heating coil can be adjusted by the above configuration.
[0011]
The invention of claim 1 is an induction heating device for a beverage can of a vending machine that heats a beverage-containing can, and two heating coils in a racetrack shape that heats the body of the beverage can from the side surface; The first heating is performed by providing a ferrite that forms a ferromagnetic magnetic path inside the track of the heating coil and a back side of the coil as viewed from the beverage can, and a ferrite that forms a ferromagnetic magnetic path outside the both heating coils. flux of the coil is configured to back through the ferrite on the back of the first heating coil through the ferrite back through the ferrite inside the second heating coil enters the can from ferrite coil inside the inner side of the ferrite In addition, the inductance is adjusted by sliding the ferrites on the back side of both coils toward each other or in a discrete direction.
[0012]
With the above configuration, even in a racetrack heating coil, it is possible to adjust the inductance by changing the magnetic resistance of the circulation path of the magnetic flux generated by both coils by making the ferrite on the back side of the coil approach or discrete. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a configuration diagram of a main part of an embodiment of the present invention, FIG. 2 (a) is a front view of FIG. 1, and FIG. 1 (b) is a cross-sectional view taken along line AA of FIG. In FIG. 1 and FIG. 2, members having the same reference numerals as those of the conventional example have substantially the same functions, and therefore description thereof is omitted. In FIG. 1 and FIG. 2, 1A is a heating coil that is wound in a cylindrical shape and has a gap at a predetermined position between adjacent coil turns, 3 is a driving roller that drives the beverage can 2, and 4 is a beverage can 2. A presser roller 5 for pressing, an inverter for supplying a high frequency current to the heating coil 1, and a ferrite 6 for forming a back magnetic path of the coil. In the figure, the heating coil 1A is cylindrical and wound in multiple layers, and there are a portion where adjacent coil wires are in close contact and a portion where a gap is provided, and the gap portion is V-shaped when viewed from the side. It has become. A U-shaped ferrite 6 that forms a back magnetic path is provided outside the heating coil 1A so as to suppress local heat of the metal parts in the vicinity of the heating coil 1A. A driving roller 3 and a pressing roller 4 that support and drive the beverage can 2 are arranged at a predetermined position in the gap between the ferrite 6 and the heating coil 1A, and the beverage can 2 is rotated during the heating to stir the contents of the beverage. To ensure uniform heating. With the above configuration, the drive roller 3 and the presser roller are provided so that the beverage can 2 can be rotated and the beverage can be easily stirred when the drive roller 3 for driving the beverage can 2 and the pressing roller 4 are provided in the gap between the heating coils 1A. 4 can be freely selected, and the degree of freedom in design increases.
[0014]
Next, the flow of magnetic flux during heating will be described with reference to FIG. When a high frequency current is passed from the inverter 5 to the heating coil 1A, the magnetic flux generated by the high frequency current surrounds the ferrite 6 on the back surface of the heating coil 1A, the surface of the beverage can 2, the ferrite 6 on the back surface of the heating coil 1A, and the heating coil 1A. It arises as follows. At that time, an eddy current is generated by the magnetic flux Φ flowing along the surface of the beverage can 2, and the beverage can 2 generates heat by this current. At this time, the current on the can surface flows along the circumferential direction of the beverage can 2.
[0015]
FIG. 3 shows a block diagram of the main part of another embodiment of the present invention. The embodiment of FIG. 3 is different from the embodiment of FIGS. 1 and 2 in that adjusting ferrites 7a and 7b for adjusting the inductance of the heating coil are added to the heating coil 1A of the embodiment of FIGS. Is a point. The adjusting ferrites 7a and 7b can be slid in the longitudinal direction along the inner surface of the heating coil 1A, and the ferrite 7a and 7b are closed in the magnetic path surrounding the heating coil 1A, and there is no ferrite. The inductance is adjusted by changing the length of the inner surface of the heating coil 1A. The flow of the magnetic flux in FIG. 3 is the same as in FIGS. 1 and 2, but the magnetic flux does not enter the can 2 in the portion where the adjusting ferrites 7a and 7b are present, and the magnetic flux passes through the inside of the adjusting ferrites 7a and 7b and the ferrite 6 on the back surface. Circulates. At this time, the widths and heights of the adjusting ferrites 7a and 7b are important, and it is necessary to intentionally cause magnetic saturation so that the magnetic flux enters the can 2 by reducing them to such an extent that rigidity can be maintained. is there.
[0016]
FIG. 4 shows a configuration diagram of the main part of another embodiment of the present invention, FIG. 5 shows an overview of the heating coil of FIG. 4, and FIG. 6 shows a cross-sectional view of FIG. 4, 5, and 6, 2 is a beverage can, 3 is a driving roller for driving the beverage can 2, 8 a and 8 b are racetrack heating coils, and 9 a and 9 b are in the tracks of the heating coils 8 a and 8 b. And magnetic field strength for heating the beverage can 2 by preventing leakage of magnetic flux with the adjusting ferrites 10a and 10b mounted on the rear surfaces of the two heating coils 8a and 8b. Shows ferrite to enhance. In the figure, the magnetic flux Φ generated by the coil 8a (8b) enters the can 2 from the ferrite 9a (9b) in the track of the coil 8a (8b) and passes again through the ferrite 9a (9b) outside the coil and the adjusting ferrite 10a (10b). Each heating coil that returns to the ferrite 9a (9b) in the track independently circulates, and one that exits from the ferrite 9a in the track of one heating coil 8a and enters the beverage can 2 in the track of the other heating coil 8b Both heating coils are configured so that they pass through the ferrite 9b, the adjusting ferrite 10b, and the adjusting ferrite 10a and then return to the ferrite 9a and circulate again. Further, the adjusting ferrites 10a and 10b are formed in a V shape so that the magnetic flux can easily enter the can 2, and the total length thereof is shorter than the length of the beverage can 2 so that the magnetic flux does not concentrate on the lid portion of the beverage can 2. It has become. In addition to the ferrites 9a and 9b, a drive roller 3 is provided in the tracks of the heating coils 8a and 8b. The reason why the drive roller 3 is provided in the track is to increase the magnetic flux in the beverage can 2 by increasing the dimension A in the figure. Since the drive roller 3 is mounted in the track, it is necessary to use a nonmetal.
[0017]
The adjusting ferrites 10a and 10b are installed so as to be movable in the BC direction, and the inductance of the coil can be adjusted by adjusting the magnetic resistance of the magnetic path of the magnetic flux that circulates by linking to both the heating coils 8a and 8b. I have to. At this time, it is desirable to open a gap of at least 1 mm between the adjusting ferrites 10a and 10b in order to suppress fluctuations in inductance due to the type of can.
[0018]
【The invention's effect】
According to the present invention, since a gap is provided at a desired position of the cylindrical coil, the position of the driving roller and the pressing roller can be freely designed when the beverage can is rotated to stir the beverage, and the optimum rotational stirring is performed. There is an effect that can be given. Further , since the back magnetic circuit is made of ferrite, the leakage magnetic flux is reduced, and only the beverage can is heated, thereby improving the electrical efficiency of the heating coil. Further , by providing the adjustment ferrite, the inductance can be adjusted without changing the number of turns of the heating coil. Therefore, it is possible to eliminate variations in inductance among heating coils, for example, to surround 3/4 of the inner surface of the coil with adjustment ferrite when heating an iron can, and to enclose almost all of the inner surface of the coil when heating an aluminum can. By combining with a mechanism for moving the adjusting ferrite, the inductance variation due to the can material can be reduced. If the difference in inductance is reduced, all the cans can be operated within the most efficient control range of the inverter, which has the effect of saving energy as a whole.
[0019]
The present invention applies the adjustment of the inductance to the racetrack-type heating coil, and has the effect of reducing the difference in inductance due to the can material and operating the inverter efficiently. Further, in the racetrack type coil, the heating coil and the heating parts such as ferrite can be gathered in one place, so that there is an effect of improving the freedom of arrangement of the can temperature sensor and the like.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of main parts of an embodiment of the present invention. FIG. 2 (a) is a front view of FIG. 1, and FIG. 3 (b) is a side view. FIG. 4 is a block diagram of the main part of another embodiment of the present invention. FIG. 5 is a schematic view of the heating coil of FIG. 4. FIG. 6 is a cross-sectional view of FIG. Configuration diagram [Fig. 8] (a) is a front view of Fig. 7, (b) is a side view of Fig. 7 [Explanation of symbols]
1A, 8a, 8b Heating coil 6, 9a, 9b Ferrite 7a, 7b, 10a, 10b Adjusted ferrite

Claims (1)

In an induction heating apparatus for beverage cans of a vending machine that heats cans containing beverages , two heating coils in a racetrack shape for heating the body of the beverage can from the side, the track inside the heating coils, and the beverage cans The ferrite that forms the ferromagnetic magnetic path on the back side of the coil as viewed from the side and the ferrite that forms the ferromagnetic magnetic path on the outside of both heating coils are provided, and the magnetic flux of the first heating coil can be transferred from the ferrite inside the coil. It is configured so that it passes through the ferrite on the inside of the second heating coil, passes through the ferrite on the back side, passes through the ferrite on the back side of the first heating coil, and returns to the inside ferrite, and the ferrite on the back side of both coils approaches each other. Alternatively, the induction heating device for a beverage can, wherein the inductance is adjusted by sliding in a discrete direction .

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