JPH03291419A - Heater - Google Patents

Abstract

PURPOSE:To keep the heating temperature at an optimum one and to save energy by a method wherein a set time for changing heating output is set shorter as an elapsed time is shorter based on the elapsed time from the time point of a heating stop of a heat generating heating means. CONSTITUTION:On the base of time counting information of a second timer means 3 which counts elapsed time from the time point of a heating stop of a heat generating heating means, a set time calculating part 4d calculates a set time so that it will be shorter as the elapsed time from the time point of the heating stop is shorter. For example, if the time counting information of the second timer means 3 exceeds three min, the set time is set to be five min, and if the information is within 3 min, the set time is set to be zero min. By this constitution, no extra energy is consumed and the heating temperature can be kept at an optimum one.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an exothermic heating means that can freely change the heating output, a timer means that measures the elapsed time from the time when the heating of the exothermic heating means starts, The heating output of the exothermic heating means is changed based on the timing information of the timer means so that the heating output until the elapsed time or the set time is exceeded is greater than the heating output after the set time has elapsed. The present invention relates to a heating device provided with a control means.

[Conventional technology]

Conventionally, in a heating device using an exothermic heating means with a large heat capacity, in order to quickly reach a predetermined heating temperature, heating is performed at a large heating output until a predetermined set time is exceeded; After that, the heating output was controlled to be lowered.

[Problem to be solved by the invention]

When cooking continuously using the above-mentioned conventional heating device, cooking is continued before the residual heat from the previous cooking has cooled down, so the large heating output after cooking starts,
There was a risk that the optimum heating temperature for cooking would be exceeded.

This not only deteriorates the quality of the cooked food but also causes wasteful consumption of energy.

The present invention has been made in view of the above circumstances, and 5.
The purpose of this is to maintain the optimal heating temperature for cooking and to avoid wasting energy even when continuous cooking is performed.

[Means to solve the problem]

The heating device according to the present invention includes: an exothermic heating means that can freely change the heating output; a first timer means that measures the elapsed time from the start of heating of the exothermic heating means; control means for changing the heating output of the exothermic heating means based on the timing information of the first timer means so as to make the heating output of the heater larger than the heating output after the elapse of the set time. It is a thing,
A first characteristic configuration thereof is that a second timer means is provided for measuring the elapsed time from the heating stop point of the exothermic heating means, and the control means controls the heating output based on the timing information of the second timer means. The present invention is configured such that the set time for changing the temperature is shortened as the time elapsed from the time of stopping the heating in the first period is shorter.

The second characteristic configuration specifies a preferable specific configuration when implementing the first characteristic configuration, and includes a turntable for placing a heated object at the bottom of the heating chamber, and the exothermic heating means. is an electric heater placed below the turntable, and another electric heater is placed above the heating chamber.

[For production]

According to the first characteristic configuration, based on the time measurement information of the second timer means that measures the elapsed time from the heating stop point of the exothermic heating means, the set time for lowering the heating output or the elapsed time from the heating stop point is determined. The shorter the elapsed time, the shorter the elapsed time, so during continuous heating cooking, the more residual heat from the previous heating cooking remains, the sooner the heating output will be reduced (
It will become.

The above effect works particularly effectively in the case of a heating device having the second feature. That is, according to the second characteristic configuration, among the upper and lower electric heaters arranged separately above and below the heating chamber,
The electric heater on the lower side is generally disposed directly on the heating chamber body forming the bottom of the heating chamber, and is heated through the heating chamber body, so it has a larger heat capacity than the electric heater on the upper side. In order to compensate for the difference in heating temperature rise speed of the upper and lower electric heaters caused by the difference in heat capacity, the upper electric heater has a steady heating output after heating starts, while the lower electric heater starts heating. This is because it is necessary to make the heating output larger than the heating output after that for a certain period of time so that the heating temperature rises quickly.

〔Effect of the invention〕

According to the first characteristic configuration, even when continuous heating cooking is performed, the more residual heat from the previous heating cooking remains, the earlier the heating output of the exothermic heating means is reduced.
It is now possible to maintain the optimum heating temperature without wasting energy.

According to the second characteristic configuration, an electric heater with a large heat capacity disposed below the turntable at the bottom of the heating chamber is used as the exothermic heating means, and by controlling as described above,
Even when continuous heating cooking is performed, it is now possible to perform appropriate heating cooking without disturbing the heating temperature balance between the upper and lower electric heaters.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
The heating device, whose schematic structure is shown in block diagram form, consists of a high-frequency oscillation type heating means (8), upper and lower electric heaters (7), (1)
) to cook the food (H) placed in the heating chamber (5). (6) is a turntable for placing food, and in particular, in order to uniformly heat each part of the food by the high frequency oscillation type heating means (8), a motor (M) is used.
It is driven by and rotates. (D) is a mounting table.

The electric heater (7) (hereinafter abbreviated as the upper heater) placed on the upper side of the heating chamber is exposed inside the heating chamber, and is directly connected to the heating chamber.
Since the object can be heated with radiant heat, a sheathed heater with a relatively small heat capacity is used.

On the other hand, an electric heater (hereinafter abbreviated as the lower heater) as a heat-generating heating means (1) placed below the turntable (6) indirectly heats the object through the turntable (6). Therefore, a plane heater with a large heat capacity is used.
7), <8) and turntable drive motor (M),
This is a control board that controls a fan motor (not shown), etc., is equipped with a microcomputer (not shown), and is programmed with the order of heating and cooking. The control board (9) is also equipped with a buzzer (B) for notifying the operator of key input and the completion of cooking.

(10) is an operation panel, which allows selection of cooking to be performed;
It is equipped with a keyboard (K) for giving commands such as setting cooking conditions, starting cooking, and canceling cooking, and a display device (D) for displaying information such as heating output and elapsed time in setting mode or cooking execution mode. There is.

Taking the case of baking toast with this cooker as an example, the outline of its operation and operation will be explained as follows. This heating device displays the display (D) except during cooking and cooking settings.
is a clock display, and in this state the keyboard (K
) can be used to select various types of cooking. here,
Press the "Toast" key to enter toast cooking setting mode. Next, use the numeric keypad or up/down keys to set the number of pieces of bread and the degree of baking.

At this time, the heater heating time is determined according to these set values. The settings for toast cooking are now complete, and you can now turn on the start key or the receiver. At this time, the display (9
) displays the cooking mode and setting values.

When the start key is pressed, cooking starts after checking that the door is closed.

Then, the upper and lower heaters (7) and (1) start heating the bread, which is the object to be heated (H) placed in the heating chamber (5). While cooking is in progress, the display (9) displays the cooking mode and a timer indicating the total cooking time, and the display is subtracted as the cooking progresses.

When the timer ends and cooking is complete, the upper and lower heaters (7
), (1) is stopped, the buzzer (B) sounds to notify the completion of cooking, and the display (9) returns to the clock display. Although the high frequency oscillation type heating means (8) is not used in this toast cooking mode, it is used in the "frozen toast" cooking mode for baking frozen bread and other cooking modes.

Next, control of the lower heater (1) as the exothermic heating means will be explained based on the block diagram of FIG. 2. Control means (
4), the first timer means (2) and the second timer means (3) are included in a microcomputer mounted on the control board (9). and control means (4
) is a set time storage unit (4c), and the set time and the first
A comparison unit (4) for comparing the time information with the time information of the timer means (2).
b), a heating output control section (4a) that variably controls the heating output of the lower heater (1) based on the comparison result, and a set time that calculates the set time based on the timing information of the second timer means (3). It is composed of a calculation section (4d).

The operation will be described in detail below. The set time calculation section (4d) performs a calculation based on the time information of the second timer means (3) such that the shorter the elapsed time from the heating stop point, the shorter the set time is. For the sake of simplicity, when the elapsed time from the heating stop point, that is, the time information of the second timer means (3) exceeds 3 minutes, the set time is set to 5 minutes, and when it is less than 3 minutes, the set time is set to 0. Comparison operations and binary selection are performed. The calculation result is stored in the set time storage section (4c). This stored set time and the time information of the first timer means (2) are compared in a comparison section (4b), and the comparison result is given to the heating output control section (4a). Heating output control section (4a)
The heating output of the lower heater (1) is controlled in two levels, strong and weak. Strong output is obtained by continuously energizing the lower heater (1), and weak output is obtained by intermittent energization (10 seconds ON/10 seconds OFF). It will be done. Then, based on the comparison result signal from the comparison section (4b), if the time measurement information of the first timer means exceeds the set time, the heating output of the lower heater is set to weak output, and if it is within the set time, output is set to strong output. to control. If the above control operation is drawn in a flowchart, it will be as shown in FIG. 3.

To explain using the above-mentioned "toast" cooking mode, when you press the start key after setting toast cooking, if the elapsed time from the time when the previous toast cooking was completed, that is, from the time when heating stopped, is over 3 minutes. , the lower heater is heated by continuous electricity (strong output) for the first 5 minutes, then turned on for 10 seconds.
/ Changed to intermittent energization (weak output) with OFF for 10 seconds. If the elapsed time from the previous heating stop is within 3 minutes,
The lower heater (1) is heated from the beginning by intermittent energization (low output) of 10 seconds ON/10 seconds OFF. On the other hand, the upper heater is always continuously energized from the start of heating to the stop of heating. This situation can be expressed in a time chart as shown in Fig. 4.

In this way, as mentioned above, when controlling the lower heater (1), which has a larger heat capacity than the upper heater (7), when starting from a cold state, heating is performed at high power for the first 5 minutes. On the other hand, in continuous cooking, when the residual heat from the previous heating is large, the heating is performed at a low output which is a steady output immediately after the start of cooking. As a result, both sides of the bread will be baked evenly in both cases.

[Another example]

In the above embodiment, an electric heater is used as the exothermic heating means (1), but the present invention is not limited to this.
For example, an exothermic heating means such as a gas burner may be used. In the embodiment, the heating output was controlled by changing the strength by switching between continuous energization and intermittent energization, but it may also be done by changing the applied voltage of an electric heater, or in the case of a gas burner, This can be done by changing the amount of supply.

Furthermore, based on the timekeeping information of the second timer means, the shorter the elapsed time from the heating stop point, the shorter the set time is calculated. In the embodiment, when the timekeeping information of the second timer means exceeds 3 minutes, The set time is 5 minutes, and when it is within 3 minutes, the set time is set to 0 minutes.The calculation is based on a one-step comparison and binary selection.For example, 1 minute, 2 minutes, 3 minutes, and 3.
Compare the stages and set the setting time to 0 minutes, 1 minute, and 3.
By increasing the number of comparisons and selections as necessary, such as four-value selection of minutes and fifths, more fine-grained control can be achieved.

Incidentally, although reference numerals are added to the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of a heating device according to an embodiment of the present invention;
FIG. 2 is a control block diagram thereof, FIG. 3 is a flow chart explaining the control operation, and FIG. 4 is a time chart thereof. (1)...Exothermic heating means (lower heater), (2
)...First timer means, (3)... Second timer means, (4)... Control means, (5)
... Heating chamber, (6) ... Turntable, (7) ... Electric heater (upper heater).

Claims (1)

[Scope of Claims] 1. An exothermic heating means (1) that can freely change the heating output, and a first timer means (2) that measures the elapsed time from the start of heating of the exothermic heating means (1). , the exothermic heating means is configured to make the heating output until the elapsed time exceeds the set time higher than the heating output after the set time has elapsed, based on the timing information of the first timer means (2). (
A heating device is provided with a control means (4) for changing the heating output of (1), and a second timer means (2) for measuring the elapsed time from the time when heating of the exothermic heating means (1) is stopped.
3) is provided, and the control means (4) is configured to set a preset time for changing the heating output based on the timing information of the second timer means (3) to determine the elapsed time from the heating stop point. A heating device configured to be shorter. 2. The heating device according to claim 1, wherein a turntable (6) for placing a heated object is provided at the bottom of the heating chamber (5), and the exothermic heating means (1) is connected to the turntable. (6) A heating device that is an electric heater placed at a lower portion, and an electric heater (7) is placed at the upper part of the heating chamber (5).