JPS5856588Y2 - electric rice cooker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of an electric rice cooker, and in particular, is configured to forcibly uniformize the rice at a relatively high temperature for a predetermined period of time after the completion of cooking.

Normally, in order to cook delicious rice, the temperature of the rice must be kept at a relatively high temperature of around 100℃ for a specified period of time (about 15 to 20 minutes) before transitioning from a high temperature state to a relatively low temperature keeping state after rice cooking is completed. ) is known to carry out so-called forced unevenness.

However, although the rice cooking operation described above is theoretically possible, in practice it is performed using a timer that sets the predetermined time mentioned above or a large number of different electronic components, making the circuit complicated. It had the disadvantage of being expensive.

It is also possible to control the uneven operation after rice cooking is completed using a sealed thermal reed switch (T, R, S) connected in series to the side heater, but in this case, it is necessary to increase the contact capacity of the thermal reed switch. Because of this, it was difficult to provide a side heater with enough heat to generate a relatively high temperature.

The present invention was made to improve the above-mentioned drawbacks, and is explained below with reference to the drawings. 1 is a cylindrical frame, 2 is a bottomed cylindrical outer pot attached to the frame 1 via a heat insulating material 3. , 4 is a heating plate in which a rice cooking heater 5 fixed to the inner bottom of the outer pot 2 is embedded; 6 is an inner pot that can be freely stored in the outer pot 2 and is placed on the heating plate 4 when stored; 7 is an insulating frame cover that fits and fixes between the upper periphery of the frame 1 and the outer edge 2; 8 is a frame cover that engages on one side with the opening periphery of the outer pot 2 and on the other side of the frame cover 7; A heat transfer plate with good heat conduction of one shape engaged with the frame 1 side, 9 an inner lid with good heat conduction such as aluminum placed on the periphery of the opening of the inner pot 6, 10 the inner lid 9 is a knob protruding from the upper surface of the central portion of the inner lid 9, and 11 is located on the upper surface of the inner lid 9, and its outer periphery is placed on the heat transfer plate 8 with the outer periphery of the inner pot 6 over the opening periphery of the inner pot 6. A heat-retaining lid with good heat conduction,
12 is located on the upper surface of the heat-insulating lid 11, and one side is connected to the frame 1.
A pressing fitting 16 is provided with a heat insulating material 13 interposed therebetween, and a spring 14 and a ring-shaped elastic engagement body 15 such as a ring-shaped silicone rubber which is constantly pressed downward by the spring 14 are attached to the back surface of the central part. A force locking mechanism 17 is provided.

Reference numeral 18 denotes an elastic pressing member such as solid silicone rubber, which is provided in the center of the heat-insulating lid 11 and has a downwardly expanding shape, and when the knob 10 is fitted, the inner lid 9 is constantly pressed by the outer peripheral edge of the pressing member 18. It works like this.

Reference numeral 19 is attached to an appropriate position on the upper surface of the heat-insulating lid 11, and is attached to the outer lid 1.
A cylindrical steam venting device 20 is located in the center of the heating plate 4 and is constantly connected to the spring 2.
1 is a rice cooking thermostat configured to protrude upward and come into close contact with the bottom surface of the inner pot 6; 22 is a rice cooking thermostat that is movable by pivotally supporting its main parts; one end is made to protrude from the frame 1;
3 is a switch lever whose other end is connected to the rice cooking thermostat 20.
The switch 24 that controls the rice cooking motor 4 is opened and closed by the movement of the rice cooker motor 4.

Reference numeral 25 indicates a band-shaped side heater attached closely to the outer wall around the opening of the outer pot 2, and 26 indicates a thermal reed switch (T, R, etc.) attached closely to an appropriate position on the outer wall of the outer pot 2. , S), etc., as shown in Figure 4, the optimal temperature for keeping warm at room temperature (T,...approximately 7
0°C), and turns on at a predetermined temperature (from the optimum heat retention temperature T1)
T2...about 100° C.) is OFF, and above a predetermined temperature 12, the ON state is maintained.

Fig. 3 shows the electric circuit of the present invention, which will be explained below. 27.27 is the power supply terminal of the AC power supply, 28
is a rectifier with control pole (hereinafter referred to as SCR), the rice cooking heater 5 is connected in series with a side heater 25, and this series circuit is connected in series with the SCR 28.

A switch 24 operated by the rice cooking thermostat 20 is connected in series with the rice cooking heater 5 and in parallel with a series circuit of the side heater 25 and the SCR 28.

29 and 30 are a resistor and a diode connected in series and connected in parallel to the switch 24; 31 is a capacitor connected between the resistor 29 and the diode 30; and the temperature regulator 26 is connected in series with the resistor 32. connected resistor 3
2, the resistor 29, and the capacitor 31 form a differential circuit, and are connected between the gate and cathode of the SCR 28 via a diode 33 for protecting the gate of the SCR 28.

34 is a rice cooking indicator connected in parallel to the rice cooking heater 5, 35 is a heat retention and unevenness indicator connected in parallel to the switch 24, 36 is a temperature fuse connected in series to the SCR 28, and 37 is a noise prevention device. Capacitor 38 is a resistor for protecting the gate of SCR28.

Next, the operation will be described. First, a predetermined amount of water and rice are stored in the inner pot 6, stored in the outer pot 2, and placed on the heating plate 4. Elastic pressing body 18
It engages with the elastic engagement body 15 of the pressure locking mechanism 17 via.

In this way, the inner cover 9, the heat insulation cover 11, and the outer cover 12 are integrated.

When the outer lid 12 is closed, the outer periphery of the inner lid 9 is tightly placed on the periphery of the opening of the inner lid 6 by the elastic pressing body 18, and the outer periphery of the heat-insulating lid 11 is caused to transfer heat by the pressing fitting 16 of the pressure locking mechanism 17. It is placed in close contact with the plate 8.

Now, set the resistance value of the rice-cooking heater 5 to about 16k, and the resistance value of the side heater 25 to about 108g, push down the button 23 to move the switch lever 22, and press the switch 24.
When it is closed, the heating plate 4 is heated by the heat of 600 W from the rice cooking heater 5, and the inner pot 6 is heated to start the rice cooking operation.

As the temperature rises as rice cooking progresses, the temperature of the temperature controller 26 changes as shown in Figure 5 A, turning OFF near the optimum temperature for keeping warm (approximately 70 degrees Celsius) and turning ON near the predetermined temperature (approximately 100 degrees Celsius).
However, the switch 24 remains closed and the side heater 25 continues to stop generating heat.

Eventually, when the rice cooking completion temperature (approximately 160°C) is reached, the rice cooking thermostat 20 acts to turn off the switch 24, but at this time the temperature near the temperature regulator 26 is relatively high (maintains the ON state). SC with differential signal from resistor 29, capacitor 31 and resistor 32
In order to turn on R28 and cause the side heater 25 to generate heat, the inner pot 6 uses the bottom surface of the rice cooking heater 5 to generate heat of approximately 1
0W and the side heater 25 has a heat output of about 70W, total of 8
Since the heating value is set to 0W and the heating is continued, as shown in Fig. 5A, the temperature of the temperature controller 26 drops rapidly from the high temperature (approximately 160°C) at the time of completion of cooking, as shown in Fig. 5A. The temperature port is set at a predetermined temperature (higher than the optimum heat retention temperature and lower than the rice completion temperature) for approximately 15 to 20 minutes from the time the rice is cooked.
(approximately 100°C) and forcefully uniform the temperature.

When the temperature of the outer wall of the outer pot 2 drops to about 100° C., the temperature regulator 26 turns OFF, stopping the gate signal of the SCR 28 and stopping the side heater 25 from generating heat.

At this time, the rice cooking heater 4 also stops generating heat, and the temperature of the outer wall of the outer pot 2 drops rapidly.

When the outer wall of the outer pot 2 reaches the optimum temperature for heat retention, the temperature controller 26 is turned on and the rice cooking heater 4
The rice is heated from the bottom and sides of the inner pot 6 with a total heat output of 80 W, which is about 70 W from the W and side heater 25, and the rice is heated to about 70 W.
It enters a warm state where it is kept warm at around ℃.

In addition, in the present invention, the temperature regulator 26 is connected in series with the resistor 32 and connected between the gate and cathode of the SCR 28, but the temperature regulator 26 does not necessarily have to be connected between the gate and the cathode. In short, it is clear that the same effect can be achieved even if the circuit is inserted into the gate circuit of the SCR 28 and the gate signal of the SCR 28 is controlled.

As described above, in the present invention, the rice cooking heater of the heating plate fixed to the inner bottom of the outer pot is connected in series with a switch for controlling the heater, and the side surface of the rice cooking plate that is attached to the switch in close contact with the outer wall of the outer pot is connected to the switch for controlling the heater. A series circuit of a heater and a rectifier with control poles is connected in parallel, the temperature regulator is arranged on the control pole side of the rectifier with control poles, and after rice cooking is completed, the rice cooking heater and the side heater are made to continuously generate heat by the regulator. Since the rice is held at a predetermined temperature higher than the optimum temperature and lower than the cooking completion temperature for a certain period of time, the rice is maintained at a relatively high predetermined temperature for a certain period of time from the completion of cooking to the keeping warm state. They can be forced to eat rice in order to obtain delicious food.

In particular, this irregular operation over a certain period of time is not only inexpensive because it does not use an expensive timer or many different types of electronic components, but also by simply using a rectifier with control poles connected in series with a temperature controller and a side heater. Just by disposing it on the gate side, the rice can be heated at a relatively high temperature for a certain period of time after the rice is cooked, so that the steaming operation can be performed relatively easily.

Furthermore, since the operation of the temperature regulator is converted into the operation of the rectifier with control poles to control the heat generation of the side heaters, the amount of heat generated by the side heaters can be made relatively large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the electric rice cooker of the present invention, Fig. 2 is a partial sectional view, Fig. 3 is an electric circuit diagram, Fig. 4 is an explanatory diagram showing the operating state of the temperature controller, and Fig. 5 is a temperature It is an explanatory diagram showing a temperature one-hour characteristic diagram of a regulator and rice temperature, and a change in calorific value of each part. 1...Frame, 2...Outer pot, 4...
...Heating plate, 5...Rice cooking heater, 6...
... Inner pot, 20 ... Rice cooking thermostat, 24 ... Switch, 25 ... Side heater 26 ... Temperature regulator, 28 ...・・・・・・
Rectifier with control pole.

Claims (1)

[Scope of utility model registration request] a frame, an outer pot installed in the frame, an inner pot that can be stored in the outer pot, a heating plate that has a rice cooking heater fixed to the inner bottom of the outer pot; a rice cooking switch that controls the heat generation of the rice cooking heater; a side heater that is closely attached to the outer surface of the outer pot; and a temperature regulator that is turned off from the optimum heat retention temperature to a predetermined temperature and turned on above the temperature; The rice cooking heater is connected in series with a switch, and a series circuit of the side heater and a rectifier with control poles is connected in parallel to the switch, and the temperature regulator is used to control the rectifier with control poles. The electricity is arranged on the pole side and when the rice cooking is completed, the rice cooking heater and the side heater are made to generate heat by the controller to maintain the rice at a predetermined temperature higher than the optimum temperature for keeping the rice warm and lower than the rice completion temperature. rice cooker.