JPH0317131Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a heating device such as an oven range or a microwave oven for heating sake cans.

〈Prior art〉 In the case of the [Omakase key], the conventional microwave oven for sake cans was limited to Choshi, and heating was performed by setting the number of Choshi from 1 to 4 (however, 1 to 4 Choshi was heated).
150 c.c.). In other words, the heating time is stored in advance in the control circuit based on the set number of Choshi bottles that determines the amount of sake, so it is OK if a container other than Choshi is used or if the content is more or less than 150 c.c. I couldn't get the finish. Furthermore, it was not possible to heat more than five choshi, and furthermore, it was necessary to set the number of choshi in an operational manner.

<Purpose> In view of the above, an object of the present invention is to provide a heater capable of heating an object to be heated to an optimal temperature state even if the weight or container of the object is different.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. The heater according to the present invention has the following features:
A heating means 2 for heating the object to be heated 1, a weight sensor 3 for detecting the weight of the object to be heated 1, and a control device for controlling the heating time of the object to be heated 1 based on the weight signal from the weight sensor 3. 4, and the control device 4 includes a first heating time calculation formula for setting the heating time according to the weight of the object to be heated that can be placed near the center of the turntable in the heating chamber; A second heating time for setting a heating time corresponding to the weight of the object to be heated whose mounting state extends from near the center to near the peripheral edge to be longer than the heating time calculated by the first heating time calculation formula. A calculation formula is stored, and when the weight of the object to be heated is smaller than the weight value that can be placed near the center of the table, the first heating time calculation formula is used to calculate a value larger than this. In the case of weight, the heating means 2 is controlled by the heating time calculated using the second heating time calculation formula.

FIG. 1 is a schematic diagram of a microwave oven. In the figure, reference numeral 5 denotes a microwave oven body. Inside the body 5, there is provided a turntable 7 which is rotated by a rotary shaft 6 that can move up and down, and below the rotary shaft 6. A weight sensor 3 is provided. This weight sensor 3 is connected to the turntable 7
A structure that changes the capacitance by contacting the rotating shaft 6 located at an appropriate height in the vertical direction according to the weight of the object to be heated 1 above, and changing the interval between the two electrode plates according to the weight. belongs to. This weight sensor 3 is incorporated into an oscillation circuit 8 of a control device 4 that converts changes in capacitance into changes in oscillation frequency. This oscillation circuit 8 is provided with an operational amplifier 12 having a terminal for inputting a positive voltage from resistors R1 and R2 and a terminal for inputting a negative voltage from the weight sensor 3 and resistor R3.
4 is for negative feedback.

The control device 4 also includes this oscillation circuit 8, a main control circuit 9 that inputs changes in the oscillation frequency of the oscillation circuit 8, and calculates a heating time limit T using a predetermined calculation formula, and the main control circuit 9, and a setting device 11 that outputs signals such as heating temperature and heating start using the heated object selection key and the heat start key. The main control circuit 9 is a general one-chip microcomputer, which has a data RAM, a program ROM, and an ALU, is driven by a reference clock oscillation circuit, and calculates two or more functions according to the weight of the object to be heated 1. It is something to be processed.

For example, in the case of a sake can, a single sake can is usually placed in the center of the turntable 7.
However, if the number of sake cans increases, they are arranged around the turntable 7. It is well known that the uniform characteristics of a microwave oven vary greatly depending on where on the turntable 7 the load is placed. In a normal microwave oven, when placed in the center of the turntable 7, the microwaves are stronger and the temperature of the heated object 1 increases more than when placed at the periphery. In other words, the object to be heated 1 is heated better and becomes hotter when placed in the center. Usually, one or two sake cans of Choshi weigh less than 600g including the container. In this case, one or two sake cans are often placed in the center, and more than that (600g or more)
When the weight of sake cans is , the number of cans increases, so they must be placed around the turntable 7. Therefore, even if the heating time is increased according to the weight, the temperature will inevitably become lower due to the influence of uniformity characteristics if the same calculation formula is used. Therefore, if the number of wires increases, the heating time should be made longer than in the relational expression for one or two wires in order to correct the poor uniformity. That is, two or more relational expressions are stored in advance in the main control circuit 9 according to the weight of the object 1 to be heated, so that even if the weight of the object 1 to be heated changes and the position of the turntable 7 changes, the finished temperature remains the same. I'm trying to make it happen.

In this example, the calculation formula is as follows: Weight G and heating limit time T. If G is less than 600g, the heating time T is T = G / c + d, and if it is more than that, T
=G/a+b. Here, each constant a, b, c,
d is determined in advance through experiments and stored in the ROM of the main control circuit 9. For example, a=5, b=
10, c = 15/2, d = 30, and set the heating time ± by setting the [strong] key and [weak] key on the setting device 11.
2/8T. In this way, the main control circuit 9 performs arithmetic processing using two (or more) relational expressions according to the weight G to calculate the heating time. FIG. 3 is a diagram showing the relationship between the heating limit time T and the weight G obtained from the above relational expression.

The drive circuit 10 also includes a transistor 13 whose base side is connected to the output terminal of the main control circuit 9.
and the relay switch 1 of the AC circuit 14 of the heating means 2 connected to the collector side of the transistor 13.
It is composed of a relay coil 15B that controls ON/OFF of 5A. The heating means 2 includes the AC circuit 14 and a high-frequency oscillation circuit 19 having a known structure that includes a transformer 16, a rectifier 17, a magnetron 18, etc., and heats the object 1 by oscillating high-frequency waves into the main body 5. It is configured.

Next, heating control of the object to be heated 1 will be explained based on the flowchart shown in FIG. is measured by the weight sensor 3, and the change in capacitance due to the weight change is output from the output terminal of the operational amplifier 12 of the oscillation circuit 8 to the main control circuit 9 as a change in frequency. The main control circuit 9 converts the weight from the number of pulses within a certain gate time.

Then, it is determined whether the object to be heated 1 is smaller than, for example, 600 g, and if it is smaller than 600 g, the heating limit time T is calculated using the function T=G/a+b,
If the weight is 600g or more, arithmetic processing is performed using the function T=G/c+d to calculate the heating limit time. Based on the calculation result, an output signal is output to the drive circuit 10 to turn on the transistor 13 and excite the relay coil 15B, thereby turning on the AC circuit 14 of the heating means 2.
By turning on, the high frequency oscillation circuit 19 is driven to cause the magnetron 18 to oscillate and heat the object 1 for a limited time T.

In this way, depending on the weight G of the object to be heated 1, the heating time is determined using two or more functional formulas to achieve a finish according to that weight, so there are no restrictions on the container, and it is usually used in households. Most containers give a good finish. Moreover, there is no limit to the number of containers, and any number of containers can be heated as long as they are lined up on the turntable 7, and a good finish can be obtained. I also put a container of alcohol on turntable 7.
It is easy to operate, as all you have to do is close the door and press the ``sake can'' and ``heat'' keys.

Note that the present invention is not limited to the number of calculation formulas for controlling the heating time and the weight for changing the calculation formulas, etc., to the above embodiments, and many modifications and changes can be made to the above embodiments within the scope of the present invention. Of course, it is possible to add

<Effects> As is clear from the above description, the present invention includes a heating means for heating an object to be heated, a weight sensor for detecting the weight of the object to be heated, and a weight signal from the weight sensor. A control device for controlling the heating time of the object is provided, and the control device controls a first heating time for setting the heating time according to the weight of the object to be heated that can be placed near the center of the table in the heating chamber. In order to set the heating time according to the calculation formula and the weight of the object to be heated, which is placed on the table from the vicinity of the center to the vicinity of the peripheral edge, to be longer than the heating time calculated by the first heating time calculation formula. The second heating time calculation formula is stored, and when the weight of the object to be heated is smaller than the weight value that can be placed near the center of the table, the first heating time calculation formula is stored. , when the weight is greater than this, the heating means is controlled by the heating time calculated using the second heating time calculation formula.

Therefore, according to the present invention, if the weight of the object to be heated is such that it can be placed near the center of the table, the heating time is controlled using the first heating time calculation formula to perform uniform heating, and In the case of weight, the object to be heated is located near the peripheral edge of the table, and the heating time calculated by the first heating time calculation formula cannot heat the object near the peripheral edge to the desired temperature. Therefore, the second heating time calculation formula is used to make the heating time longer than the heating time corresponding to the weight of the object to be heated that can be placed near the center of the table.

In this way, since the heating time is not set by the number of containers as in the past, but by the weight sensor, a good finish can be obtained without much restriction on the number of containers.

In addition, since the placement status of the heated object on the table is determined based on the signal from the weight sensor,
For example, depending on the type of object to be heated, "Omakase key"
By using this, you can heat the objects near the peripheral edge of the table to the desired temperature, and there is no limit to the number of containers, and you can heat as many containers as you like on the table. It has excellent effects when finished.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a microwave oven showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the control device, Fig. 3 is a diagram showing the relationship between heating time and weight, and Fig. 4 is the control flow of the same. It's a chat. 1: object to be heated, 2: heating means, 3: weight sensor, 4: control device.

Claims (1)

[Claims for Utility Model Registration] A heating means for heating an object to be heated, a weight sensor for detecting the weight of the object to be heated, and a heating time of the object to be heated based on a weight signal from the weight sensor. A control device is provided, and the control device includes: a first heating time calculation formula for setting the heating time according to the weight of the object to be heated that can be placed near the center of the table in the heating chamber; a second heating time calculation formula for setting a heating time corresponding to the weight of the object to be heated, which is placed from near the center to near the peripheral edge, to be longer than the heating time calculated by the first heating time calculation formula; is stored, and when the weight of the object to be heated is smaller than the weight value that can be placed near the center of the table, the first heating time calculation formula is used to The heater is configured to control the heating means according to the heating time calculated using the second heating time calculation formula.