JPS62176409A - Jar rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heater circuit configuration for a jar rice cooker that cooks rice deliciously.

2. Description of the Related Art The heater circuit of a conventional jar rice cooker was constructed as shown in FIG. That is, a relay contact 2 is connected to one end of the AC power source 1, and a bottom heater 3 is installed between one end of the relay contact 2 and the other end of the AC power source 1 to heat the inner pot from below.
are connected. A body heater 4 for heating the inner pot from the side and a bidirectional thyristor 6 are connected in series to both ends of the relay 2. Further, a lid heater 6 that heats the inner pot from above is connected in parallel to the body heater 4. The thyristor 5 and the relay 2 are supplied with drive signals from a control means 7 consisting of a microcomputer and a thermistor (not shown), and are controlled to be turned on or off in accordance with the rice cooking and heat keeping conditions.

When the rice cooking operation is started, the bottom heater 3 heats the inner pot from the bottom by closing the relay contact 2. on the other hand,
When the relay contact 2 is open, heating can be performed by the body heater 4, lid heater 6, and bottom heater 4 by turning on the thyristor 5, but when the maximum heating power is required, the body heater 4, the bottom heater 6 It cannot be heated.

Next, when the rice cooking operation is finished, the relay contact 2 is always open, and the thyristor 5 is turned on and off to perform a warming operation. In this case as well, there is an optimum value for the power balance between the three heat-retaining heaters, and if this balance is disrupted, problems such as dew accumulating somewhere in the inner pot will occur. In this heater circuit configuration, the optimum value is the resistance value ratio of bottom heater: body heater: lid heater = 1: about 13: about 23. Problems to be solved by the invention - In the conventional circuit configuration When the maximum heating power is required, that is, when the relay contact 2 is closed, the body heater 4 cannot perform heating. That is, there was a problem in that it was not possible to heat the entire rice in an ideal cooking state.

The present invention solves these problems and aims to provide a rice cooker that can heat the entire rice in an ideal rice cooking state.

Means for Solving the Problems In order to solve the above problems, the present invention separately provides a body heater on the outside of the inner frame, which is connected in parallel with the bottom heater and for heating the inner pot from the side. By providing one,
When cooking rice, even when the relay contact is closed, the two heaters, the bottom heater and the body heater, can heat the entire rice cooker.

Effects According to the above configuration, by simply adding one body heater, there is no need to increase the number of power control elements or complicate the control operation of the control means, and there is no need to disrupt the power balance during heat retention. It is possible to heat the entire rice in the ideal rice cooking state when maximum heat is required for cooking rice.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the circuit diagram of FIG. 1 and the main body configuration diagram of FIG. 2. In Figure 2,
1o is an inner pot containing rice and water; this inner pot 10 is heated from the bottom by a bottom heater 11;
First and second body heaters 13 and 14 for heating the inner pot 1o from the side are provided on the outer side of the inner frame 12 that houses the inner frame 12. A lid heater 16 is provided at the upper part of the rice cooker, and these four heaters heat the inner pot 10 to cook rice and keep it warm.

The electrical connections of these heaters are as shown in Figure 1.
A relay contact 18 is connected to one end of the AC power source 17, and a bottom heater 11 is connected between the relay contact 18 and the other end of the AC power source 17. Further, a first body heater 13 is connected in parallel to this bottom heater 11. Said relay contact 1
A bidirectional thyristor 19 and a parallel circuit of a second body heater 14 and a lid heater 16 are connected in series to both ends of the heater 8 . The drive signals for the relay contact 18 and the thyristor 19 are output from the control means 2o, and the control means 2o is composed of a thermistor, a microcomputer, and the like. When the relay contact 18 is closed during rice cooking, the two heaters, the bottom heater 11 and the first body heater 13, heat the entire inner pot 1o from both the bottom and sides. , when the relay contact 8 is open and when keeping warm, the bottom heater 11 and the lid heater 1 are turned off.
6 and the second body heater 14. because,
The resistance value of the first body heater 13 is sufficiently large compared to the resistance value of the bottom heater 11, so it hardly contributes to heating. In other words, the resistance value ratio is bottom heater: first body heater: second Body heater: Lid heater = 1: Approx. 13: Approx. 13:
This is because it is approximately 23.

After the rice cooking operation starts, the control means 20 controls the relay contact 1.
8, turn on and off, perform the initial soaking in water called ``Hajime Choro Choro'', and then heat it over high heat called ``Nakaba, Pa''. At this time, the inner pot 1o is heated entirely by the bottom heater 11 and the first body heater 13.
o The entire area is heated evenly. Thereafter, when the rice cooking is finished, the relay contact 18 is opened, and the bottom heater 11, the second body heater, and the lid heater 16 are heated and kept warm in a well-balanced manner by the on/off operation of the thyristor 19.

Effects of the Invention As described above, according to the present invention, the body heater connected in parallel with the bottom heater and for heating the inner pot from the side is separate from the body heater connected in series to both ends of the relay contact. Since it is provided on the outside of the inner frame, during rice cooking, even when the relay contact is closed, the two heaters, the bottom heater and this body heater, can heat the entire body, and as a result, the power control element There is no need to increase the number of rice cookers, complicate the control operation of the control means, or disrupt the power balance during heat retention, and evenly heats the entire rice, which is the ideal rice cooking state, when maximum heat is required when cooking rice. It has the excellent effect of being able to cook rice.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a jar rice cooker showing an embodiment of the present invention, a vertical sectional view of a second jar rice cooker, and FIG. 3 is a circuit diagram of a conventional jar rice cooker. 10... Inner pot, 11... Bottom heater, 1.
2-00. ,,inner frame, 13...first body heater, 1
4...Second body heater, 15...fi, 1
e・-=i upper heater 17...AC power supply, 18
...Relay contact, 19...Thyristor,
20... Control means. Name of agent: Patent attorney Toshio Nakao and one other person N-
- Single bottom heater /, 3-1 1st / IF heater / 4-) = 10- Inner pot 11--Ichiko Ichita/Z--Ichinai Sui/j--Goname 1's fighting heater 14--Goname 2's n gate heater 2nd figure 15-8/6-L heater

Claims (1)

[Claims] A relay contact connected to one end of the AC power source; a bottom heater connected between the relay contact and the other end of the AC power source and provided at the bottom of the inner pot containing rice and water; A first body heater connected in parallel to the bottom heater and provided on the outer side of the inner frame housing the inner pot, and a first body heater connected in series with both ends of the relay contact and provided on the outer side of the inner frame. a second body heater and a thyristor provided therein, a lid heater connected in parallel to the second body heater and provided on an upper part of a lid located at an upper part of the inner pot, and driving the relay and the thyristor. and control means for supplying a signal.