JPS6037053Y2 - electric rice cooker - Google Patents

Description

[Detailed explanation of the idea] This invention applies to electric rice cookers (including electronic jar rice cookers).

The same applies hereafter). The conventional electric rice cooker is
It is normal to turn off the rice cooker immediately after the rice has boiled, and then steam and heat the rice using a steam heater, or steam the rice using the residual heat of the rice cooker, and then heat the rice additionally using a steam heater. Ta.

That is, in conventional electric rice cookers, both steaming heating and additional heating are not actively performed after heating the rice.

As a result, the rice could not be cooked sufficiently deliciously.

The reason for this is that electric rice cookers do not have a large amount of residual heat like older stoves, so if steaming is done only with residual heat, steaming will not be sufficient, and even if you actively steam and heat, additional heating will be required. This is because if there is no moisture, evaporation of water will not occur.

This invention has been developed in view of the above-mentioned drawbacks of conventional electric rice cookers, and has been improved so that steaming and heating is performed using a steaming heater after the rice has finished cooking, and additional heating is performed using the rice-cooking heater several minutes after the start of steaming and heating. The circuit is configured to perform active steaming heating and additional heating after the rice has been cooked so that delicious rice can be cooked, and the three heating operations are performed by using two heaters in combination to reduce the number of parts.
The purpose is to provide an electric rice cooker that is inexpensive in terms of cost.

The configuration of the present invention will be described below based on the embodiments shown in the drawings.

As shown in Figs. 1 and 4, in the present invention, the steaming heater 1 and the motor 2' of the motor cam timer are connected in parallel, and the motor cam timer 2' is connected to this parallel circuit.
One changeover contact a1 constituting the changeover switch 5w-1
are connected in series to form a steaming circuit A.

A heating circuit port is configured by further connecting a rice cooking heater 3 in parallel to this steaming circuit A.

C is a switching circuit connected in series to the heating circuit port, and this switching circuit C is a non-returnable thermal type installed at the bottom of the rice cooker body between the normally open contact of the motor cam timer 2 and the switching circuit C. It is configured by connecting in parallel one switching contact C1 of the rice cooking switch 5w-2.

In addition, the selector switch 5w-1 of the motor cam timer 2
The other switching contact a2 constituting the switch is connected to the other switching contact b2 of the non-returnable thermal rice cooking switch 5w-2.

In the figure, 4 is a lid heater, and 5 is a heat-retaining circuit.

Next, the operation of the electric rice cooker having the above structure will be explained with reference to the circuit diagram shown in FIG. 1, the time chart shown in FIG. 2, and the bottom temperature chart shown in FIG. 3.

Rice cooking is started by operating the non-returnable thermal rice cooking switch 5w-2.

This rice cooking switch 5W-2 is the rice cooking temperature T1.
In the following, the fixed contact C and the switching contact C1 are connected to each other so that the rice cooking heater 3 is energized, so the rice cooking heater 3 starts cooking and heating the rice.

On the other hand, the changeover switch 5w-1 of the motor cam timer 2 is set in advance so that the fixed contact a and the switching contact a□ are connected when rice cooking starts. The timer 2 is made conductive and each operation is started.

The motor cam timer 2 then switches the changeover switch 5w-1 to the changeover contact a2 side about one minute after the start of operation.

Therefore, the heating of the steam heater 1 and the operation of the motor cam timer 2 are stopped.

From then on, only the rice cooking heater 3 heats the rice.

As the rice is cooked, the temperature of the rice rises, reaching the finished cooking temperature T1.
When the temperature T1 is reached, the non-returnable thermal rice cooking switch 5w-2 senses the temperature T1, performs a switching operation, and connects the switching contact C2 and the fixed contact C.

Therefore, the rice cooking and heating by the rice cooking heater 3 is completed.

At this point, there is still excess water around the rice, and the rice is not fluffy.

Due to the switching operation of the thermal rice cooking switch 5w-2, the steaming heater 1, the motor 2' of the motor cam timer, the contact aa of the changeover switch 5w-1, and the non-returnable thermal rice cooking A circuit passing through the contact C2-c of the switch 5w-2 is formed, and steaming heating by the steaming heater 1 and time counting by the motor cam timer 2 are started.

When steaming is carried out by active heating in this way, the excess ice around the rice penetrates deeper into the core of the rice than when steaming is carried out using a small amount of residual heat from heating the rice. moisture becomes more even.

In other words, fluffier rice can be obtained.

The motor cam timer 2 closes its normally open contact for a predetermined period of time when a predetermined period of time has elapsed since the start of steaming and heating.

As a result, a circuit passing through the rice cooking heater 3 and the normally open contact point is formed, and additional heating is performed by the rice cooking heater 3 during the cherry blossom season.

By the way, the temperature of the rice after the rice cooking is finished decreases relatively rapidly, as is clear from the pot bottom temperature diagram in FIG.

For this reason, the starch in the rice stops gelatinizing, making it impossible to obtain delicious rice. However, in the present invention, by performing the above-mentioned additional heating using the rice cooking heater 3, a rapid drop in the temperature of the rice can be prevented. The gelatinization of starch can be completely promoted to the core of the rice.

When time has elapsed since the start of steaming and heating, the motor cam timer 2 operates the changeover switch 5w-1 to connect the fixed contact a and the changeover contact a1 and cut off the power to the steaming circuit A. It will be in a warm state.

Incidentally, the motor cam timer 2 operates for a predetermined time 'ut2. 'G' is counted and the switch 5W-1 and the normally open contact are operated to perform steaming heating and additional cooking heating.In this case, if the time is counted from the start of rice cooking, the end time of rice cooking will be determined by the amount of rice. This is because steaming and heating and additional heating cannot be performed at accurate timings depending on the amount of ice.

In short, in this invention, there is a steaming circuit in which one switching contact constituting the changeover switch of the motor cam timer is connected in series to a parallel circuit of the motor of the motor cam timer and the steaming heater, and a steaming circuit that is parallel to the steaming circuit. A heating circuit is constructed with a rice cooking heater connected to the
A normally open contact of a motor cam timer and one switching contact of a non-resettable thermal rice cooking switch are connected in parallel to form a switching circuit for the heating circuit, and the switching circuit and the heating circuit are connected in series. By connecting the other switching contact constituting the switching switch of the motor cam timer and the other switching contact of the rice cooking switch, the switching circuit of the motor cam timer and the switching circuit control energization to the heating circuit. However, since I mistakenly started steaming and heating the rice by a few minutes before starting steaming and heating, I added additional heating using the rice cooker, so active steaming and additional heating ensured that the rice was sufficiently fluffy and that the starch had not gelatinized. You can cook delicious rice that reaches the core of the rice.

Furthermore, since the three heating operations are performed using two heaters, parts can be omitted, and an electric rice cooker can be provided at low cost.

[Brief explanation of the drawing]

The drawings are all for explaining the embodiments of the present invention. Figure 1 is a circuit diagram of the electric rice cooker of the present invention, Figure 2 is a time chart of each switch and heater, and Figure 3 is a diagram showing the temperature at the bottom of the pot. FIG. 4 is a sectional side view of the main part of the electric rice cooker of the present invention. 2...Motor cam timer, 1...
Steaming heater, 5W-1...Motor cam timer switch, A...Steaming circuit, 3
...Rice cooking heater, opening...Heating circuit,
b... Motor cam timer normally open contact, 5w
-2...Non-resetting type thermal rice cooking switch, c...
...Switching circuit.

Claims (1)

[Scope of utility model registration request] The steaming circuit consists of a parallel circuit of the motor of the motor cam timer and the steaming heater connected in series with one switching contact that constitutes the switching switch of the motor cam timer, and the rice cooking heater connected in parallel to this steaming circuit. The switching circuit of the heating circuit is configured by connecting the normally open contact of the motor cam timer and one switching contact of the non-resetting type thermal rice cooking switch in parallel, and the switching circuit and the heating circuit are connected in parallel. By connecting the circuit in series and connecting the other switching contact constituting the switching switch of the motor cam timer and the other switching contact of the rice cooking switch, the switching switch of the motor cam timer and the switching circuit can be connected in series. An electric rice cooker characterized in that the power supply to the heating circuit is controlled so that additional heating is performed by the rice cooker several minutes after the start of steaming and heating by the steaming heater.