KR950003301Y1 - Cooker - Google Patents

Abstract

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Description

Electric Rice Cooker

1 is a schematic view showing a heater installation state of a general electric rice cooker.

2a and b are diagrams showing a circuit diagram of a conventional heating apparatus and its heating state.

3 is a view showing a temperature distribution state of the rice cooker by a conventional heating device.

Figure 4a, b is a circuit diagram showing an embodiment of the heating apparatus of the present invention and a diagram showing the heating state thereof.

5a, b is a circuit diagram showing another embodiment of the heating apparatus of the present invention and a diagram showing the heat state thereof.

Figure 6a, b is a circuit diagram showing another embodiment of the heating apparatus of the present invention and a diagram showing the heating state thereof.

* Explanation of symbols for main parts of the drawings

20: upper heating unit 21: upper heater

30: lower / side heating part 31A, 31B: lower heater

32,32A ~ 32C: Side heater RYS31 ~ RYS39: Relay switch

The present invention relates to a heating device for an electric rice cooker which cooks rice by heating grains such as rice while heating a heater under the control of a microcomputer, and in particular, an electric rice cooker heating device capable of uniformly heating the bottom, side, and top of the rice cooker. It is about.

In general, the firewood over the conventional cauldron is structured to cover the bottom and sides of the cauldron uniformly and heat, so when heated, the heated water in the cauldron is convexed smoothly and transferred to the upper part, which causes the top of the cauldron to rise. Boils faster than the middle and bottom, and the grains ripen as they go from top to bottom.

At this time, water is absorbed or evaporated into the grains, and the rice is uniformly transferred to the lower and side surfaces of the wide cauldron, so that the grains do not become unripe or layered, and maintain a uniform cooking state.

However, the conventional electric rice cooker uses a lower heater with a high heat generation as a main heating element in a limited structure and heats the lower side heat and a lower heater as an auxiliary heating element so that the heat of the lower part is not sufficiently transferred to the side and the top, The state of cooking became uneven.

This conventional technique will be described in detail with reference to the drawings of FIGS. 1 to 3.

1 is a schematic view showing a heater installation state of a general electric rice cooker, as shown therein, the lower heater (3) having a high heat generation amount is installed on the bottom of the rice cooker (2) built in the main body (1), the heat generation amount on the side The lower side heater 4 is installed, and the upper heater 7 is installed above the cooker cover 6 of the lid 5.

FIG. 2A is a circuit diagram of a conventional heating apparatus for controlling heat generation of the heaters 3, 4, and 7 installed as described above, and as shown therein, the output terminals OT1 to OT3 of the microcomputer 10 are resistors R1. It is connected to the base of transistors Q1 to Q3 through ˜R3, connected to the bases of transistors Q1 to Q3, and connected so that the power source B + is applied to the emitters of transistors Q1 to Q3. The collector of Q2 is connected to the relays RY1 and RY2, and the collector of the transistor Q3 is connected to the gate of the triac TRI1 through the resistor R4.

In addition, the relay switch RYS1 and the 110V lower heater 3A are connected in series to the AC power supply AC, and the relay switch RYS2 and the lower heater 3B for the 220V are connected in series. ), The upper heater 7 and the side heater 4 were connected in series to the relay switch RYS1 in parallel.

In the conventional heating apparatus configured as described above, when the microcomputer 10 outputs the low potential to the output terminal QT1 when the AC power source AC is 110V while the power source B + and the AC power source AC are applied, the transistor When Q1 is turned on and the relay RY1 is driven, the relay switch RYS1 is connected, the lower heater 3A for 110V is heated, and the microcomputer 10 outputs when the AC power source AC is 220V. When the low potential is output to the terminal OT2, the transistor Q2 is turned on, and the relay RY2 is driven so that the relay switch RYS2 is connected, and the 220V lower heater 3H generates heat.

When the microcomputer 10 outputs a low potential to the output terminal OT3 while the relay switch RYS1 is not connected, the transistor Q3 is turned on and a trigger signal is applied to the gate of the triac TRI1. Since the upper heater 7, the side heater 4, and the lower heater 3A for 110V are heated, the upper heater 7 and the side heater 4 are turned on when the relay switch RYS1 is connected. Does not fever That is, the conventional heating apparatus selectively drives the relays RY1 and RY2 according to the AC power source AC of 110V and 220V when cooking, as shown in FIG. 2B, so as to lower the heater 3A and 3B. ) Heats selectively and heats the lower heater 3A, side heater 4 and upper heater 7 by conducting the triac TRI1 when moisturizing or warming. Control the amount of heat generated by adjusting the conduction and blocking duty ratio.

However, the conventional heating device as described above is heated depending on the lower heater which is the main heating element during cooking, so that the heated water is not convection smoothly, as shown in FIG. The temperature rise of the phosphorus B part caused a temperature deviation, resulting in uneven cooking. Also, the lower heater, the side heater, and the upper heater can all heat the front surface, but the lower heater has the side of the main heating element. Since the heater and the upper heater are designed to have a lower resistance than the resistance value, the side heater and the upper heater generate more heat than the lower heater, thereby causing a thermal imbalance.

The present invention was devised to solve the above-mentioned conventional problems, and it is possible to heat the lower heater, the side heater and the upper heater independently to reduce the temperature deviation of each part of the rice cooker uniform cooking state An object of the present invention is to provide a heating apparatus capable of obtaining the same, which will be described in detail with reference to FIGS. 4 to 6.

Figure 4a is a circuit diagram showing an embodiment of the heating apparatus of the present invention. As shown therein, the heating apparatus of the present invention has an upper heating part 20 for heating the upper part of the rice cooker under the control of the microcomputer (not shown in the drawing), and the side and the lower part of the rice cooker under the control of the microcomputer. And a lower / side heating part 30 for selectively heating.

Here, the upper heating unit 20 connects the triac TRI1 and the upper heater 21 controlled by the microcomputer to the AC power source AC21 in series.

The lower / side heating part 30 connects the relay switch RYS31 and RYS32, the lower heater 31A for 110V, and the lower heater 31B for 220V, respectively, in series to the AC power source AC21, and the side heater. (32) and the relay switch (RYS33) in series with the AC power source AC21 to connect the junction box of the relay switch (RYS31) and the lower heater (31A) for 110V and the connection point of the side heater 32 and relay switch (RYS33) The relay switch RYS34 was connected in between.

In the heating apparatus of the present invention configured as described above, when the triac TRI21 of the upper heating unit 20 is turned on under the control of the microcomputer while the AC power source AC21 is applied, the upper heater 21 is heated and the upper portion of the rice cooker is heated. Heating.

In this state, when the relay switch RYS33 is connected under the control of the microcomputer as shown in FIG. 4B, the side heater 32 generates heat to reinforce the side temperature of the rice cooker. By controlling the duty ratio, the heating values of the lower heaters 31A and 31B and the side heaters 32 are adjusted to perform the moxibustion and heat retention functions.

In the state where the upper heater 21 is heated as described above, when the relay switches RYS31 and RYS32 are selectively connected according to the AC power source AC11 of 110V and 220V, the lower heaters 31A and 31B It is selectively heated to cook while heating the rice cooker together with the upper heater 21, and the lower heaters 31A and 31B are selectively generated according to the AC power source AC21 of 110V and 220V. As the duty ratio of the switch RYS33 is adjusted, the upper heater 21, the lower heater 31A or 31B, and the side heater 32 are all heated to cook the rice cooker while heating the entire surface.

On the other hand, Figure 5a is a circuit diagram showing another embodiment of the heating device of the present invention, as shown therein, through the relay (RYS31) (RYS32) and 110V lower heater 31A and 220V lower heater 31B through the relay switch (RYS35) (RYS36), 110V lower heater (31A) side heater (32A) and 220V lower heater (32B) are connected to the movable contact of relay switch (RYS37) (RYS38) so that one fixed contact (a) The connection point of the relay switch RYS31 (RYS32) and the lower heater 31A, 31B was connected, and the other stationary contact point b was connected to the other terminal B, and the lower side / side heating part 30 was comprised.

Another embodiment of the present invention configured as described above is connected to the relay switch (RYS35) (RYS36) in a state in which the movable contact of the relay switch (RYS37) (RYS38) is connected to the other fixed contact (b) as shown in FIG. In this case, the side heaters 32A and 32B generate heat to reinforce the side temperature, and the relay switches 31A and 32B are connected while the movable contacts of the relay switches RYS37 and RYS38 are connected to one fixed contact a. The amount of heat generated is controlled to perform moxibustion and warmth.

The relay switches RYS31 and RYS32 are connected to heat the lower heaters 31A and 31B, or the relay switches RYS31 and RYS32 are connected to the 110V lower heater 31A and the 220V lower heater 31B, respectively. In addition, the relay switch (RYS39) and 110V side heaters 32A and 32B were connected in series, and the 220V side heater 32C was connected in parallel to the 220V lower heater 31B.

According to another embodiment of the present invention configured as described above, the side heaters 34A and 32B and the lower heater 31A generate heat by being connected while controlling the duty ratio of the relay switch RYS39 as shown in FIG. 6B. And the lower heaters 31A and 31B and the side heaters 32B and 32C generate heat as the relay switches RYS31 and RYS32 are connected to heat the rice cooker together with the upper heater 21. You will be cooking.

As described in detail above, the present invention allows the lower heater, the side heater, and the upper heater to independently heat and cook the rice cooker while heating the front, thereby reducing the temperature deviation of each part of the cooker, thereby maintaining a uniform cooking state. You can get it.

Claims (3)

(Correction) The upper part which heats the upper part of the rice cooker which consists of the triac TRI21 which becomes conduction under the control of a microcomputer, and the upper heater 21 which generate | occur | produces in accordance with the conduction state of the triac TRI21 when AC power is applied. The relay switch RYS31 and RYS32 that control the heating unit 20, the lower heater 31A for 110V and the lower heater 31B for 220V by the control of the microcomputer, and the relay switch RYS31 and RYS32 110V lower heater 31A and 220V lower heater 31B that generate heat according to the open state, relay switch RYS33 for controlling side heater 32 to reinforce the side temperature of the rice cooker, and relay switch RYS33. The side and bottom of the rice cooker consisting of a side heater 32 to generate heat according to the open state of the), and a relay switch (RYS34) for controlling the amount of heat generated by the lower heaters 31A, 31B and the side heater 32 is selectively selected. Heating device for an electric rice cooker including a lower / side heating portion 30 to heat. The lower / side heating part 30 connects a relay switch (RYS31) (RYS32), a 110V lower heater (31A) and a 220V lower heater (31B) in series with an AC power source (AC21). The terminal A to which the AC power source AC21 is applied is connected to the relay switch RYS35 (RYS36), the 110V side heater 32A, and the 220V lower heater 32B of the relay switch RYS37 (RYS38). One stationary contact (a) is connected to the movable contact to the connection point of the relay switch (RYS31) and (RYS32) and the lower heater (31A) and 31B, and the other stationary contact (b) is connected to the other terminal (B). Heating device of an electric rice cooker characterized in that. The lower / side heating part 30 connects the relay switch RYS31 and RYS32, the 110V lower heater 31A and the 220V lower heater 31B to the AC power source AC21 in series. In addition, the relay switch (RYS39) and 110V lower heaters 32A, 32B are connected in series, and 220V side heaters 32C are connected in parallel to the lower heater 31B. Heating device.