JPS63169430A - Heating cooker - Google Patents

Abstract

PURPOSE:To increase the number of cooking kinds by making simultaneous current-conduction and individual current-conduction possible to both the upper and lower heaters. CONSTITUTION:At the initial period of heating start current to both heaters 4a, 4b is supplied to make preheating in the condition that contacts 20b, 20d are switched on and a contact 20f is switched off by the operation of a relay 20. After that, the contacts 20b, 20d are off and the contact 20 is on by the operation of the relay 20 caused by the signal from a control means 21 and power source voltage is applied on the side of a switchover circuit 19. In this condition, a relay 18 is operated by the signal from the means 21 and current to the upper heater 4a and lower heater 4b is alternately supplied. At that time, by the operation of a changeover switch 11, 12 the current-carrying conditions of the heater 4a can be brought in such voltage control conditions as rated currentsupplying, half-wave current-supplying with a diode 9, and voltage drop current-supplying with an auxiliary resistor 10. The optimum heating condition therefore can be set to be suitable for cooked foodstuffs and cooking performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating cooker such as an open toaster having a function of controlling energization of a heater provided in a cooking chamber.

2. Description of the Related Art Conventionally, this type of heating cooker has been constructed as shown in FIGS. 4 and 5, for example. That is, both side walls 32a of the substantially box-shaped inner casing 32 forming the cooking chamber 31,
Between 32b are upper and lower heaters 3 that heat the cooking chamber 31.
3a and 33b are provided, and these heaters 33g
, 33b was provided. The control circuit in this control section 34 is as shown in the jgS diagram. A diode 35 and an auxiliary resistor 36 are connected in series to the upper heater 33a, and switches 37 and 38 are connected to the diode 35 and the auxiliary resistor 36, respectively. connected in parallel. A lower heater 33b is connected in parallel with this circuit, and a power source 41 is connected in series with these through a main switch 39 and a timer 40.

Using the above configuration, switch 37.
By turning on and off 38, the controllers 33a, 33
It controlled the energization of b. For example, when the switch 37 is turned on and the switch 38 is turned off, the upper heater 33a and the auxiliary resistor 36 are connected in series, and the power of the upper heater 33a is slightly reduced. In addition, when the switch 37 is turned off and the switch 38 is turned on, the upper heater 33a and the diode 3
5 is connected in series, and the upper heater 33a performs half-wave rectification, reducing the power to half.

The heater 33 is turned on by changing the knob and switches 37 and 38.
The electric power of a and 33b was controlled, and it was possible to adjust the thermal power according to the food being cooked.

Problems to be Solved by the Invention In such a conventional configuration, although the heating amount of the heaters 33a and 33b is adjusted using a diode 35, an auxiliary resistor 36, etc., delicate adjustment is not possible. It was very difficult to obtain optimal heating conditions. For example, when cooking gratin to brown the food, heating is performed more than necessary in order to brown the food, but at this time the lower heater 33b also continues to heat. However, in cases where the amount of heating is very delicate, such as when the inside of the food is heated too much and the quality of the rice cake is poor, if the amount of heating is too large, the inside of the rice cake may become hollow. There was a problem that dripping occurred, and conversely, if the amount of heating was small, the browning did not occur. Furthermore, it is extremely difficult to obtain the best results when cooking foods with completely different cooking heights, such as toast and gratin, under almost the same heating conditions.

The present invention solves these conventional problems by adjusting the heating amount according to the food being cooked, preventing deterioration in the quality of the food due to the height of the food, and achieving optimal cooking conditions. The purpose of this invention is to provide a heating cooker that can be heated.

Means for Solving the Problem In order to solve this problem, the heating cooker of the present invention includes a cooking chamber, an upper heater and a lower heater disposed at the upper and lower parts of the cooking chamber, and the upper and lower heaters. The controller is equipped with an upper heater circuit having an upper heater, a lower heater circuit having a lower heater, a power supply circuit that applies a power supply voltage to both ends of these heater circuits, and a power supply circuit that applies a power supply voltage to both ends of these heater circuits. 1 switching means to switch the power supply voltage from the power supply circuit,
a switching circuit that alternately applies voltage to the upper heater circuit and the lower heater circuit; and a second switching circuit that selectively switches the power supply voltage between a side that directly connects the power supply voltage to both of the heater circuits and a side that connects the power supply voltage to the switching circuit side.
It is composed of a switching means and a control means for controlling both of these switching means.

Function In the above configuration, in the initial stage of heating the food, after the upper and lower heaters are energized to rapidly heat them, the WR, 2 switching means switches to the switching circuit side, and the first switching means alternately switches the upper and lower heaters. For example, for cooking that requires a dark texture, such as gratin,
If you turn on the upper heater for a long time just before the end of cooking, you can get good brown marks, and when cooking mochi, etc., you can turn on the upper and lower heaters alternately to evenly distribute the top and bottom surfaces of the rice cake without creating cavities. Therefore, the optimum heating condition can be obtained depending on the food to be cooked, and the cooking performance can be improved.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figures 1 to 3, reference numeral 1 denotes a cooking chamber provided on one side of the cooking device main body 2, and the inner cylinder body 3 made of aluminum-treated steel plate or the like is shaped like a box. ing. An upper heater 4a and a lower heater 4b are arranged at the upper and lower parts of the inner cylindrical body 3 between both side walls, respectively. The other side of the cooking device main body 2 is provided with a control section 5 that controls energization of both heaters 4a and 4b, and includes changeover switches 11 and 12, a timer 15, and the like. The deceased, said kitchen 1
An opening/closing door 6 is swingably provided at the front opening of the grill, and the opening/closing door 6 is connected via a metal link 7 to a gridiron 8 on which food is placed. As shown in FIG. 2, the control section 5 includes a diode 9, an auxiliary resistor 10, and an upper heater 4a connected in series, and a first switching switch 11 and an auxiliary resistor 1 that short-circuit both ends of the diode 9.
An upper heater circuit 13 having a second changeover switch 12 that short-circuits both ends of the o, a lower heater circuit 14 having a lower heater (4b), and a main l switch (not shown), a timer 15, and a power supply 16 in the middle. and both heater circuits 1
a power supply circuit 17 that applies a predetermined voltage to heater circuits 3 and 14; and a switching circuit 19 that has a first relay (first switching means) 18 in the middle and alternately switches and applies a power supply voltage to both heater circuits 13 and 14. , the power supply voltage is directly applied to both heater circuits 13 and 14.
a second relay (second switching means) 20 that selectively switches between the side connected to the heater circuit 13 and the side that applies the power supply voltage to both heater circuits 13 and 14 via a switching circuit 19;
．． 20 and a control means (comprised of a microcomputer or the like) 21. The first relay 18 is of a two-contact type. therefore,
The switching circuit 19 connects a common wire 22 that connects the common terminal 18a of the first relay 18 and the second relay 20, and connects the 2@ terminals 18b and 18c of the first relay 18 to each heater circuit 13 and 14, respectively. It consists of upper heater and lower heater branches @23 and 24.

Of the terminals 18b and 18c of the first relay 18, the terminal 18b connected to the upper heater branch line 23 is normally closed (N
The other terminal 18C is always connected (No contact color), and the second relay 20 is a three-contact type. Each common side terminal 20a, 20c, 20e on one side is connected to the power supply circuit 17 side, and the first and second terminals 20e on the other side are connected to the power supply circuit 17 side.
0b and 20d are connected to the upper and lower heater circuits 13 and 14, respectively, and the other third terminal 2Of is connected to the switching circuit 19 side. Note that the second relay 20 has first and second contacts 20b connected to both heater circuits 13 and 14.
, 20d is turned on, the third contact 20f connected to the switching circuit 19 is turned off.

Of course, when the first and second contacts 20b and 20d are turned off,
The third contact 20f is turned on.

In the above configuration, at the beginning of heating, the first and second contacts 20b, 20d'f! are activated by the operation of the second relay 20. :
On, turn off the third contact 20f and turn on the image heaters 4a, 4b.
Electricity is supplied to both of the cooking chambers 1 and 1 to quickly heat the inside of the cooking chamber 1 and preheat the cooking chamber 1.

Thereafter, a signal from the control means 21 causes the second relay 2 to
0 is activated and the first and second contacts 20b, 20d are turned off,
When the third contact 20f is turned on, the power supply voltage is applied to the switching circuit 19 side. In this state, the first relay 18 is activated by a signal from the control means 21, and as shown in FIG. 3, the upper heater 4a and the lower heater 4b are alternately energized. At this time, the first and second changeover switches 11.12
By operating the upper beater 4a, the energization state of the upper beater 4a is changed to
Voltage control can be performed such as rated energization (see Fig. 3a), half-wave energization by the diode 9 (see Fig. 3), and voltage drop energization by the auxiliary resistor 10 (see Fig. 3C). For example, in the case of cooking that requires browning, such as gratin, by increasing the energization time of the upper heater 4a before the end of cooking, the browning will be achieved successfully.For cooking such as grilling, the upper heater 4a and the lower heater 4b By alternately energizing the rice cakes and the rice cakes, the rice cakes can be baked uniformly without forming cavities, in the same way as baking with a gas fire while turning the rice cakes.Furthermore, the control means 21
Furthermore, since the energization time of the upper heater 4a and the lower heater 4b can be freely controlled, the heating time of the upper heater 4a and the lower heater 4b, that is, the heating amount, can be adjusted depending on the size of the food to be cooked. . In this way, the optimum heating shape U can be set according to the food to be cooked, and cooking performance can be improved.

Effects of the Invention According to the above configuration of the present invention, in addition to energizing both the upper and lower heaters at the same time, it is possible to energize each heater separately, so that the optimum heating shape H can be set according to the type and shape of the food to be cooked. Therefore, the quality of cooking can be improved and the variety of cooking can be increased.

[Brief explanation of the drawing]

1 is an overall perspective view of a heating cooker showing an embodiment of the present invention, FIG. 2 is a control circuit diagram of the same heating cooker, FIG. 3 is an explanatory diagram of the heating state of the same heating cooker, and FIG. ...Cooking, 2
...Cooker body, 4a...Upper heater, 4b...Lower heater, 5...Control unit, 13...Upper heater circuit, 1
4... Lower heater circuit, 17... Power supply circuit, 18...
・First relay (first switching means), 19... switching circuit,
20... Second relay (second switching means), 21... Control means. Fig. t-] River storage 4b - Ichishita heater stub S egg Fig. 5 Fig. 4

Claims (1)

[Claims] 1. A cooking cabinet, an upper heater and a lower heater arranged in the upper and lower parts of the cooking cabinet, and a control unit that controls the upper and lower heaters, and the control unit is an upper heater circuit having the upper heater. A lower heater circuit having a lower heater, a power supply circuit that applies a power supply voltage to both ends of these heater circuits, and a first switching means provided in the middle to transfer the power supply voltage from the power supply circuit to the upper heater circuit. a switching circuit that alternately applies voltage to the lower heater circuit; a second switching means that selectively switches the power supply voltage to the side where the power supply voltage is directly connected to the two heater circuits and the power supply voltage to the switching circuit side; and both switching means. A heating cooker comprising a control means for controlling the.