JPH04251121A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To eliminate a heating disturbance of a cooked item and make a well-dried flavor rich cooked state in a heating and cooking device having a ventilating fan for cooking fishes or meats. CONSTITUTION:In order to eliminate stagnation of flow in a heating chamber, a ventilating fan 13 and a control device 1 for controlling a rotation of the discharging fan. The control device 1 may provide the number of rotation of the ventilating fan 13, its rotational direction and an output time as one data and stores many combinations of the data as a data series of one period. In correspondence with each of the cooking operations, the ventilating fan is controlled under the most suitable data series, thereby water vapor or smoke or heated air in the heating chamber is entirely agitated uniformly without being stayed at one location, resulting in that there is no difference in concentration of discharged air at a central part and a peripheral part of the heating chamber and the heating disturbance for the cooked item is eliminated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device for cooking food using a heater or the like, and particularly to a grilling device for cooking fish and meat.

0002

2. Description of the Related Art Generally, a conventional heating cooking apparatus A has electric heating devices (
For example, planar heaters 14a and 14b are installed. A door 16 is provided at the front of the heating chamber 19 for taking food 15 in and out. The electric heating devices 14a and 14b are controlled by a control device 17.

[0003] If the food 15 is a fish or meat dish, the heating chamber 19
A mounting table 27 is placed on top of the enamel oven dish 18 inserted into a shelf, and food is cooked on the table 27. This is to bring the food 15 as close as possible to the electric heating device 14a, and also to allow the enamel dish 18 to catch oil and juice released from the food 15 during cooking. The steam 20 and smoke generated during cooking and the heated air in the heating chamber 19 are removed by an exhaust guide 22 by an exhaust fan 25 at a constant rotation speed according to each cooking menu.
is forcibly exhausted out of the device through the Note that 26 is an oxidation catalyst that purifies exhaust gas.

0004

[Problems to be Solved by the Invention] However, in the heating cooking apparatus A having the above-mentioned configuration, the exhaust fan 25 rotates at a constant rotation speed, so that the flow of steam 20, smoke, and heated air is in a steady state. Therefore, the center of the heating chamber is well vented, but the periphery of the heating chamber is vented less than the center. If you cook meat or fish in this state, the food around the heating chamber will look like steamed food, and it won't be crispy or fragrant, and it won't get very brown.

The present invention has been made in view of the above, and
The purpose is to provide a heating cooking device without uneven heating as described above.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a heating chamber for storing food to be cooked, a heating means for heating the food to be cooked, and a heating means provided outside the heating chamber in the heating chamber. an exhaust fan that forcibly exhausts the air;
a control means for controlling the rotation of the exhaust fan, the control means converts the rotation speed, rotation direction, and output time of the exhaust fan into one data, and converts a large number of combinations of the data into data of one cycle. A plurality of one-cycle data series are stored as a series, the exhaust fan is controlled by the one-cycle data series, and the one-cycle data series is such that the power spectrum of the air volume of the circulation fan is changed to a frequency. It is characterized by being an inversely proportional data series.

[0007]

[Function] The heating cooking device of the present invention can increase or decrease the number of revolutions of the exhaust fan, or rotate forward or reverse, depending on the above-mentioned configuration, thereby eliminating water vapor, smoke, and heat in the heating chamber. Since the exhausted air does not stay in one place but is stirred throughout the heating chamber, there is no difference in density between the center and the periphery of the heating chamber, and uneven heating of the food is corrected.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating cooking apparatus A according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a heating cooking apparatus A according to an embodiment of the present invention.
FIG. A commercial power source 2 supplies a voltage generated by a constant voltage generating circuit 5 to a microcomputer (hereinafter referred to as microcomputer) 1 via a low voltage transformer 3.

At the terminal of the microcomputer 1, there is a thermistor 12 as a temperature detector whose analog value changes depending on the temperature;
A timer knob 7 for setting numerical values such as heating time is connected to a display device 6 for displaying cooking functions, cooking menus, cooking times, and cooking temperatures.

Furthermore, the terminals of the microcomputer 1 include a group of menu switches 8-e for selecting necessary heating functions and cooking menus, and a rising switch 8-c and a descending switch 8-d for setting a heating target temperature. Input means 8 is connected, which includes a start switch 8-a for instructing to start cooking, a cancel switch 8-b for instructing to interrupt or cancel cooking, and the like.

On the other hand, when the heating function, cooking menu, heating target temperature, heating time, etc. are input into the ROM of the microcomputer 1, the information is displayed on the display device 6, and the microcomputer 1 The RAM has the function of setting, and at the same time has the function of counting the time signal taken in via the time pulse generation circuit 4 to measure the heating time.

Furthermore, when the start switch 8-a is inputted in the ROM of the microcomputer 1 after completing the predetermined heating settings, the magnetron 10 or the heater 14-a, which is the heating means, is activated based on the contents stored in the RAM of the microcomputer 1. a, 1
4-b and the like to start heating, and further controls the magnetron 10 and heater 14 according to the input level of the thermistor 12 and the elapsed heating time, which are measured separately.

Further, the ROM of the microcomputer 1 is provided with a function of displaying on the display device 6 the heating state in progress, for example, the set heating time by subtracting the heating time as time passes after heating is started.

FIG. 2 shows the rotational speed of the exhaust fan and the control rotation of the forward and reverse rotations. By controlling the photocoupler 15 with the output of the microcomputer 1, the triac 16 of the primary circuit is controlled, and the rotation speed of the exhaust fan motor 18 can be varied. Furthermore, forward rotation or reverse rotation of the exhaust fan motor 18 is determined by turning on or off the relay contact 17. That is, the rotation speed of the exhaust fan can be controlled by the on-time of the photocoupler 15.

Furthermore, the ROM of the microcomputer 1 stores the rotation speed, rotation direction, and output time of the exhaust fan 25 as one data corresponding to each cooking, and stores a large number of combinations of the above data as one cycle data series. It has been done.

For example, when performing power control in four stages as shown in FIG. 3, if the photocoupler 15 is turned on at each timing a to f as shown in FIG. Supplied.

The ROM of the microcomputer 1 stores a plurality of one-cycle data series as shown in FIG. 3, corresponding to each cooking. By controlling the exhaust fan using the data series shown in Figure 3, the exhaust air such as steam 20, smoke, and heated air inside the heating chamber will have no difference in density between the center and the periphery of the heating chamber, and the food will be cooked. The uneven heating is corrected.

Furthermore, when controlling with a data series in which the power spectrum of the air volume of the exhaust fan 25 is inversely proportional to the frequency (1/f: f = frequency) in the data series of one cycle, uneven heating of the food is A phenomenon in which there was no difference between the center and the periphery of the room was observed. Figure 5 shows the frequency characteristics of the power spectrum of the exhaust fan air volume at that time.
Shown below.

Furthermore, the power spectrum of the air volume is 1/f2
, 1/f1.5, etc. (f=frequency), and to add more of these, it is sufficient to add corresponding data for each.

In the above embodiment, the air volume of the exhaust fan 25 is set to 4.
Although we have described switching to stages, it goes without saying that it can be easily applied to increasing or decreasing individual stages, combining forward and reverse rotations, and other physical quantities.

[0022]

[Effects of the Invention] As described above, the heating cooking apparatus of the present invention provides additional effects.

[0023] That is, in the present invention, the rotation speed and rotation direction of the exhaust fan change depending on the cooking menu, and the steam, smoke, and heated air are not concentrated in one place but are agitated and exhausted. This eliminates the difference in the density of the exhaust air between the center and the periphery of the heating chamber, which has the effect of preventing uneven heating of the food.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control circuit of a cooking device according to an embodiment of the present invention.

FIG. 2 is a control circuit diagram of an exhaust fan motor of a cooking device according to an embodiment of the present invention.

FIG. 3 is a timing chart for controlling the rotation speed of the exhaust fan motor of the cooking device according to the embodiment of the present invention.

FIG. 4 is a diagram showing the on-timing of the photocoupler corresponding to each power when controlling the rotation speed of the exhaust fan motor of the cooking device according to the embodiment of the present invention.

FIG. 5: Frequency characteristic diagram of the exhaust fan of the cooking device according to the embodiment of the present invention.

[Fig. 6] Side sectional view of a conventional heating cooking device

[Fig. 7] Planar sectional view of a conventional heating cooking device

[Explanation of symbols]

A Cooking device 1 Control means (microcomputer) 14 Heater 19 Heating chamber 25 Exhaust fan

Claims (2)

[Claims] 1. A heating chamber for storing food to be cooked, heating means for heating the food to be cooked, and an exhaust fan provided outside the heating chamber for forcibly exhausting air in the heating chamber.
A control means for controlling rotation of the exhaust fan,
The control means stores a plurality of one-cycle data series, with the rotation speed, rotation direction, and output time of the exhaust fan as one data, and a large number of combinations of the data as one-cycle data series. , a heating cooking device that controls the exhaust fan using the data series of one cycle. 2. The heating cooking apparatus according to claim 1, wherein the one-cycle data series is a data series in which the power spectrum of the air volume of the circulation fan is inversely proportional to frequency.