JPH0375993A - Induction heating device of automatic vending machine - Google Patents

Abstract

PURPOSE:To bring can drinks whose can diameters are different to induction heating by one set of heating coils by using such a circular arc-like heating coil as the can wall of the can drink having the maximum diameter runs along. CONSTITUTION:A can 1a of a small diameter is contained along the lowest face of a circular arc part of a can containing part 3 to which a circular arc- like heating coil is wound so that the can wall of a can 1b having the maximum diameter runs along. According to this constitution, many kinds of can drinks of two kinds, etc., whose can diameters are different are brought to induction heating satisfactorily by using one set of heating coils in common.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an induction heating device for a vending machine that heats induction-heatable canned beverages such as coffee at the time of sale and sells them hot.

[Conventional technology] - When canned beverages such as coffee are stored at high temperatures for long periods of time, the growth of bacteria increases compared to when they are stored at room temperature. Alternatively, store it at room temperature and heat it by induction at the time of sale.
Vending machines that sell over-the-counter (OT) products have been proposed.

Unexamined Japanese Patent Publication No. 1-6 as an induction heating device for this type of vending machine
No. 4776, as shown in Figure 7, a heating coil/I/2 for induction heating a cylindrical canned beverage 1 is wound so that the cylindrical can wall follows the minimum dimensions for induction heating sales. In this way, canned beverages 1 of different lengths can be efficiently heated with one heating coil, thereby increasing the operating rate of the vending machine.

Problems to be Solved by the Invention However, currently, there are two diameters for canned beverages as shown in the table, and the contents are diversifying, so there are only a few products sold with heating coils for single-diameter canned beverages. The problem was that the operating rate of vending machines had to be reduced.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an induction heating device for a vending machine that inductively heats canned beverages of different diameters with one heating coil.

Means for Solving the Problems In order to solve the above problems, the induction heating device for a vending machine of the present invention provides a can with the largest diameter among at least two types of canned beverages that can be induction heated. The heating coil is equipped with a heating coil wound in an arc shape so that the wall of the beverage can follows, and a can storage part that is set so that the lowermost surface of the canned beverage is located at the lowermost portion of the arcuate surface of the heating coil.

Effects The present invention has the above-described configuration, and can be used for various types of canned beverages by using a heating coil wound in an arc along the can wall of the canned beverage with the largest diameter. Canned beverages can be sold by induction heating using a single heating coil.

Embodiment FIG. 1 is a perspective view showing an embodiment of a heating coil and a can storage section in an induction heating device for a vending machine according to the present invention. FIG. 2 is a sectional view taken along line A-A' in FIG. Figure 1,
Referring to Figure 2, diameters of 1a and 1b are φ53 and φ, respectively.
66mm canned beverage, 2 is a large diameter φ66m shoulder canned beverage 1
The heating coil is wound in an arc shape so that the can wall follows b. 3 is a heating coil 2 and a canned beverage 1a according to the diameter of the canned beverage 1a, 1b.

This is a can storage section that is set so that the lowermost surface of the canned beverage is located at the lowermost portion of the arcuate surface of the heating coil by changing the distance from the heating coil.

FIG. 3 shows a circuit diagram of an induction heating device for a vending machine according to the present invention. In the figure, 2 is a heating coil, 4 is a resonant capacitor connected in parallel to the heating coil, 5 is a power switching semiconductor connected in series to the heating coil 2, and 6 is an inverter connected in antiparallel to the power switching semiconductor 5. These are diodes for conducting operation, and these constitute a resonant high frequency inverter circuit 8 which converts DC power supplied from a DC power source into high frequency power. 9 receives a HOT sales signal 10 generated at the time of sale in the main body of a vending machine (not shown) and periodically conducts (switches) the power switching semiconductor 5 for a preset heating time.
This is a constant cycle conduction control means.

The operation of the induction heating device for a vending machine configured as described above will be explained. First, when a HOT sales switch (not shown) using induction heating of a vending machine (not shown) is selected, a HOT sales signal 10 is input to the periodic conduction control means 9.

The periodic conduction control means 9 receives this signal and periodically conducts (switches) the power 6 and the basic switching semiconductor 5.
let In this way, the DC power from the DC power supply 7 is switched at high frequency by the power switching semiconductor 5, and resonated by the heating coil/I/2 and the resonant capacitor 4, thereby generating a constant high frequency power in the heating coil (v2) and heating it. A canned beverage 1 on a carp/L/2 is heated by induction for a preset heating time and sold.

Here, as shown in FIG. 4, a heating coil 2 is wound around an MMCD canned beverage 1b having a diameter of φ66 in an arc shape so that the can wall follows the can wall.
Now, the operation of the resonant high-frequency inverter circuit 8 will be explained when the can storage section 11 is set so that the bottom surfaces of canned beverages 1a and 1b of different diameters are in the same position. At this time, the positional relationship between the heating coil 2 and the canned beverages 1a, 1b having different diameters is as shown in FIG. As is clear from the figure, it can be seen that the canned beverage 1a having a diameter of 53 mm is farther away from the heating coil /I/2 than the canned beverage 1b having a diameter of 66 mm. As the distance between the heating coil/I/2 and the load (canned beverage) increases, the electric power absorbed by the load (canned beverage) decreases (decreases heating efficiency), and the AC equivalent resistance of the heating coil (heating coil) v2 decreases. At the same time, the effect of canceling magnetic flux due to eddy currents generated in the can wall is reduced, and the AC equivalent inductance is increased. Therefore, as shown in FIG. 5, the current flowing through the power switching semiconductor 5 and the diode 6 increases for the canned beverage 1a with φ53 am (in FIG. 5, A is the canned beverage 1a between φ53, and B is the canned beverage 1a with φ66 am). canned drink pHb
(current waveform when heating). From this, the switching loss of the power switching semiconductor 5 and the diode 6 during induction heating increases in the canned beverage 1a having a diameter of 53 mm compared to the canned beverage 1b having a diameter of 66 mm.

Therefore, the power switching semiconductor 5 has a large current φ
It is necessary to use one rated according to the characteristics of the canned beverage 1a of No. 53.

On the other hand, the heating coil 2 and the can i storage section 3 shown in FIG. A heating coil (V2) is wound in an arc shape as shown in FIG. I have to. This reduces the switching loss of the power switching semiconductor 5 and the diode 6 during induction heating of the canned beverage 1a having a diameter of φ53, and makes the switching loss of the power switching semiconductor 5 and the diode 6 constant regardless of the diameter.

As described above, according to this embodiment, the heating coil 2 has a diameter of 66 mm.
By winding the canned beverage 1b in an arc shape so that the can wall follows the diameter of the canned beverage 1b, even the canned beverage 1a having a diameter of φ53 can be heated by induction. 1, on the heating coil 2, a canned beverage 1a;
The can storage section 3 that stores the canned beverage 1b brings the canned beverage 1a close to the heating coil 2, and the canned beverage 1a, the canned beverage 1b, and the heating coil /I/
2, the switching loss of the power switching semiconductor 5 and the diode 6 during induction heating can be kept to a minimum. Circuit 8 can be realized. -Also, even if the heating coil/I/2 is adapted to the diameter of the canned beverage 1b with a diameter of φ66, the canned beverage 1a with a diameter of φ53 and the canned beverage 1b with a diameter of φ66πm are always at the top of the arc surface of the heating coil. The lowest side of the canned beverage is at the bottom 11'
Like T! The practical effects such as i'i: being determined are extremely large.

In this embodiment, the can storage section 3 is configured to accommodate canned beverages 1a of different diameters,
1b, it is obvious that the same effect can be obtained by making the structure V-shaped and supporting it at two points as shown in Fig. 6.

Effects of the Invention As is clear from the examples, the induction heating device for a vending machine of the present invention is effective for induction heating of canned beverages with the largest diameter among at least two different diameters of canned beverages that can be heated by induction. It is equipped with a heating coil wound in an arc shape along the can wall, and a can storage section that is set so that the bottom surface of the can beverage is located at the bottom of the arc surface of the heating coil. −
and support the can drinker with at least two or more points,
Since the heating coil has a structure that changes the distance between the heating coil and the canned beverage according to the diameter of the canned beverage, the heating coil 10
By winding the bale in an arc along the can wall of the can beverage, which has the largest diameter among the can beverages that can be heated by induction, it is possible to induction heat even small diameter can beverages.

Moreover, the can storage part that is located on the heating coil and stores canned beverages is structured so that the distance between each canned beverage and the heating coil is equivalently equal for canned beverages of different diameters. Therefore, the loss in the electric circuit can be kept constant regardless of the type of canned beverage, and the electric circuit rating for induction heating can be realized without burning. Even if the heating coil is wound in an arc so that it follows the can wall of the can beverage, which has the largest diameter, the bottom surface of the can beverage will always be at the bottom of the arc surface of the heating coil, regardless of the can diameter. The practical effects are extremely large, such as being able to be positioned so that the

[Brief explanation of drawings]

Fig. 1 is a perspective view of a heating coil and a can storage section showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A' in Fig. 1, and Fig. 3 is an induction heating of a vending machine of the present invention. The circuit configuration diagram of the device, FIG. 4, shows canned beverages 1a with different diameters. 11, 7 A cross-sectional view of the can storage part set so that the bottom surfaces of 1b are at the same position, FIG. 5 shows voltage and current waveforms of the power nutwitching semiconductor 5 and diode 6, and FIG. FIG. 7 is a cross-sectional view of a can storage section supported by a can storage section, and FIG. 7 is a perspective view of a conventional heating coil. 1a, 1b...Canned beverage, 2...Heating coil, 3...Can storage section.

Claims (3)

[Claims] (1) A heating coil wound in an arc shape along the can wall of a can beverage with the largest diameter among can beverages of at least two or more diameters that can be heated by induction; and a circular arc of the heating coil. An induction heating device for a vending machine, comprising: a can storage section configured such that the bottom surface of the canned beverage is located at the bottom of the surface. (2) The induction heating device for a vending machine according to claim 1, wherein the can storage section is provided on the upper surface of the heating coil and has a structure to support the canned beverage at at least two points. (3) The induction heating device for a vending machine according to claim 1, wherein the can storage section has a structure that changes the distance between the heating coil and the can beverage according to the diameter of the can beverage.