JP2517031B2 - Induction heating device for vending machines - Google Patents

Description

TECHNICAL FIELD The present invention is directed to hot selling of canned beverages such as coffee by induction heating.
T-sale) vending machine induction heating device.

2. Description of the Related Art In recent years, an automatic heating vending machine that applies induction heating and instantly heats a canned beverage at the time of sale has been devised, but this type of automatic vending machine is disclosed in Japanese Utility Model Publication No. 54-15598. By winding a heating coil for inductively heating a cylindrical canned beverage along the cylindrical can wall in the laid state along the wall, there is one that attempts to efficiently and uniformly heat the entire canned beverage with a simple structure. is there.

FIG. 4 shows a conventional heating coil wound in an arc plate shape along a cylindrical can wall. Reference numeral 1 is a canned beverage, and 2 is a heating coil wound in a single layer in an arc plate shape so that the can wall of the canned beverage 1 is along. FIG. 5 is a block diagram of an induction heating device of a vending machine. In the figure, 2 is a heating coil, 3 is a resonance capacitor connected in parallel to the heating coil 2, and 4 is a switching semiconductor connected in series to the heating coil 2,
Reference numeral 5 is a diode for reverse conduction, which is connected in parallel to the switching semiconductor 4 and constitutes a voltage type resonant inverter circuit 7 formed by a single transistor for converting DC power supplied from the DC power supply 6 into high frequency power. Reference numeral 8 is a fixed-cycle conduction control means for receiving a HOT sale signal 9 generated at the time of sale in a main body of an automatic vending machine (not shown) and periodically conducting (switching) the switching semiconductor 4 for a certain period of time.

The operation of the induction heating device of the vending machine configured as described above will be described. First, when the HOT sale switch (not shown) of the canned beverage 1 by induction heating of the vending machine (not shown) is selected, the HOT sale signal 9 is generated. The fixed cycle conduction control means 8 receives this signal to make the switching semiconductor 4 conductive in a fixed cycle. Thereby, the DC power from the DC power supply 6 is high-frequency switched by the switching semiconductor 4 and resonated by the heating coil 2 and the resonance capacitor 3 to generate high-frequency power in the heating coil 2 and induce the canned beverage 1 on the heating coil 2. It is to heat.

Problems to be Solved by the Invention However, in the conventional configuration, the heating coil is wound in an arc plate shape along the cylindrical can wall of the can beverage, and in the experiment, the length of the heating coil is longer than the length of the can beverage. If it becomes longer, burning will occur at the place where the lid part of the can drink and the cylindrical can wall part are joined, so the length of the heating coil must be about the length of the can drink. . That is, the sizes of canned beverages such as coffee currently sold are mostly as shown in the table, and it is necessary to set the minimum length to a can diameter of 66 mm and the capacity of a 190 ml can to about 73.0 mm.

In this case, the coil wire has a current capacity of φ0.5 mm × 2
When a heating coil is realized by using about 0 strands, the total number of turns is 10 to 15 turns. On the other hand, the voltage-type resonance inverter system generally has a relationship that the heating output (P) is proportional to the coil current (A) flowing through the heating coil and the square of the number of turns (T) of the heating coil. Ie P
∝AT ² To reduce the heating time at the time of sale, the heating output at an input voltage of 100 V is 1200 W (this 1200 W is about the maximum output of the electric cooker applying induction heating that adopts this inverter method)
In order to obtain, the coil current (≈current flowing through the switching semiconductor) becomes 100 A or more, and there is a problem that the heat generation of the heating coil itself increases and the circuit cost greatly increases due to the large capacity of the switching semiconductor. Also, in order to bring this coil current to a practical level of 20 to 30 A, the number of turns of the heating coil cannot be increased with the conventional configuration, so the heating output must be reduced to about 1/4. The time is about four times longer, and the waiting time for heating for the purchaser of canned drinks is too long to be realized as a product.

In view of the above problems, it is an object of the present invention to provide an induction heating device for a vending machine, which can obtain a predetermined heating output without increasing the coil current.

Means for Solving the Problems In order to solve the above problems, the induction heating device of the vending machine of the present invention uses a heating coil for inductively heating a canned beverage as a plurality of layers of at least two layers or more.

Effect of the Invention With the above-described configuration, the present invention makes it possible to easily increase the total number of turns by using two or more layers even if the length of the heating coil is about the length of the canned beverage and the number of turns per layer is small. Therefore, the predetermined heating output can be obtained without increasing the coil current.

Practical Example FIG. 1 shows a heating coil of an example of an induction heating device for a vending machine according to the present invention. 2 is a sectional view taken along the line AA 'in FIG. In FIG. 1, the heating coil 10 is wound in two layers in a circular arc plate shape so that the can wall of the canned beverage 1 is along. As shown in FIG. 2, the heating coil 10 has a first circumference upper layer (101 to 102), a first circumference lower layer (102, 103, 104) from the center thereof,
Second circumference lower layer (104, 105, 106), Second circumference upper layer (106, 10)
7, 108), the third upper layer (108, 109, 110), ... and Nth
It is wound in two layers up to the lap, and the number of turns is 2N. Further, FIG. 3 shows a block diagram of the induction heating device of the vending machine of the present invention. In the figure, 10 is a heating coil wound in two layers as described above. The other configurations are the same as the conventional ones, and thus the description thereof is omitted.

The operation of the induction heating device of the vending machine configured as described above will be described. First, when the HOT sale switch (not shown) of the canned beverage 1 by induction heating of the vending machine (not shown) is selected, the HOT sale signal 9 is generated. The fixed cycle conduction control means 8 receives this signal to make the switching semiconductor 4 conductive in a fixed cycle. Thereby, the DC power from the DC power supply 6 is high-frequency switched by the switching semiconductor 4, and the heating coil 10 and the resonance capacitor 3 resonate to generate high-frequency power in the heating coil 10 to induce the canned beverage 1 on the heating coil 10. It is heated and sold as HOT. In this case, the number of turns of the heating coil 10 is twice the number of turns of the single-layer heating coil, and if the heating output is the same, the coil current is 1/4 that of the single-layer coil.

As described above, according to the present embodiment, the heating coil 10 is wound in two layers in order from the center in the shape of an arc plate along which the cylindrical can wall of the canned beverage 1 runs. Ten
Since the total number of turns can be easily increased even if the length is about the length of the canned beverage 1 and the number of turns per layer is small, a predetermined heating output can be obtained without increasing the coil current. As a result, excessive heat generation in the heating coil 10 can be prevented, and the inverter circuit 7 can be constructed at low cost without increasing the withstand voltage of the switching semiconductor 4.

EFFECTS OF THE INVENTION As described above, the present invention has at least two layers of heating coils for inductively heating canned beverages that are sequentially wound from the center or the outer periphery in an arc plate shape along the cylindrical can wall of the canned beverages. Due to the multiple layers, if the heating coil is longer than the canned beverage, can burning will occur, so even if the number of turns per layer is reduced by limiting the length of the heating coil to the length of the canned beverage, multiple layers By doing so, the total number of turns can be easily increased, so that a predetermined heating output can be obtained without increasing the coil current. As a result, excessive heat generation in the heating coil due to an increase in coil current can be prevented, and the inverter circuit can be configured at low cost without increasing the withstand voltage of the switching semiconductor.

[Brief description of drawings]

FIG. 1 is a perspective view of a heating coil showing an embodiment of the present invention,
2 is a sectional view taken along the line AA 'of the heating coil of FIG. 1, FIG. 3 is a block diagram of an induction heating device of a vending machine according to an embodiment of the present invention, and FIG. 4 is a perspective view of a conventional heating coil. FIG. 5 is a block diagram of a conventional induction heating device for a vending machine. 1 ... Can drink, 3 ... Resonant capacitor, 4 ... Switching semiconductor, 7 ... Inverter circuit, 10 ... Heating coil.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideki Omori Inventor Hideki Omori 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kazuhiko Asada 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-1-171094 (JP, A)

Claims (1)

(57) [Claims] 1. A heating coil for inductively heating a canned beverage, which is sequentially wound from a center or an outer periphery in an arc plate shape along a cylindrical can wall of the canned beverage, and a plurality of heating coils having at least two layers are provided. Induction heating device for vending machines, which is characterized by layers.