JPS6226765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an electronic jar rice cooker for cooking rice and keeping it warm.

Conventionally, when cooking rice with this type of electronic jar rice cooker, if you do not soak the rice sufficiently in water after rinsing the rice, the moisture will not penetrate into the rice enough and the core will remain in the cooked rice. There were times when the rice did not cook properly.

The present invention has been developed in view of these conventional drawbacks, and is characterized in that fluffy rice can be cooked even if the rice is simply rinsed and there is no soaking time.

Embodiments of the electronic jar rice cooker of the present invention will be described below with reference to the accompanying drawings.

The electronic jar rice cooker is configured such that a lid 2 is attached to a main body 1 so as to be openable and closable, and an inner pot 3 can be detachably housed in the main body 1. A rice-cooking heater 4 and a rice-cooking switch 5 are installed on the inner bottom of the main body 1, a heat-retaining heater 6 and a heat-retaining temperature-sensitive switch 7 are installed on the inner surface of the main body 1, and a lid heater 8 is installed on the bottom surface of the lid 2. It is set up.

Next, the operation of this rice cooker will be explained. In FIG. 2, 9 is an AC power supply, and 10 is a relay. When the temperature of the heat-retaining temperature-sensitive switch 7 is lower than a predetermined operating temperature, the contacts of this switch 7 are closed, and the coil of the relay 10 is closed. voltage is applied,
The contacts of relay 10 are common contact C - normally open contacts N, O
There is a short circuit between the rice cooking heater 4 and the warming heater 6.
A heat retention circuit is formed by the lid heater 8 to keep the rice warm, and the temperature of the rice gradually rises (third
_T1 in the figure). This allows water to quickly penetrate into the rice. At this time, even if the rice cooking switch 5 is closed, the common contact C which is the contact of the relay 10 - the normally closed contacts N, C
Because of the gap, the rice cooking heater 4 does not consume power during normal rice cooking. Next, when the temperature of the heat-retaining temperature-sensitive switch 7 rises and reaches the operating temperature, the contact of the heat-retaining temperature-sensitive switch 7 opens, and the relay 10 is activated by short-circuiting between C-N and C. The space between O is open.

As a result, the rice cooking heater 4 is connected to the AC power source 9 between the contacts C-N and C of the relay 10 and through the rice cooking switch 5, a rice cooking circuit is formed, and the rice is heated to a high temperature by the rice cooking heater 4. It is cooked.
When the operating point of rice cooking switch 5 is reached,
T ₂ when the rice cooking switch 5 opens and the rice cooking ends. After rice cooking is completed, the temperature-sensitive switch 7 for keeping warm is open until the temperature of the temperature-sensitive switch 7 falls to the operating temperature, so the contacts of the relay 10 are C-N,
Since C is short-circuited and C-N and O are open, no current flows through any heaters, but when the temperature drops to the operating temperature of switch 7, C-N and C are open and C-N is open. -N and O are short-circuited, and the parallel circuit of the heat-retaining heater 6 and lid heater 8 is connected in series with the rice-cooking heater 4, and this series circuit is connected to the AC power supply 9 to form a heat-retaining circuit, and the rice-cooking heater 4 is connected in series. T ₃ is kept at a constant temperature.

As described above, according to the present invention, even if the rice is cooked without soaking it thoroughly in water, sufficient water content in the rice is ensured in a short period of time at a temperature that provides good soaking efficiency, and fluffy and delicious rice can be produced. In addition to being able to cook rice, a temperature-sensitive switch with a low current capacity for heat retention is used as the drive source for the relay coil, which extends the contact life of this switch and improves reliability. When switching from the end of the rice cooking operation to the keep-warm operation via the relay coil, the switch is made only by the operating temperature of the heat-retaining temperature-sensitive switch. The structure is simpler than that of the original, and
The operation can also be simplified.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the electronic jar rice cooker of the present invention, and FIG. 2 is an electric circuit diagram of the same rice cooker.
FIG. 3 is a diagram showing the rice cooking characteristics. 1...Body, 2...Lid, 3...Inner pot, 4...Rice cooking heater, 5...Rice cooking switch, 6...Warmth keeping heater, 7...Warmth sensitive switch, 8...Lid heater .

Claims (1)

[Claims] 1. A lid provided on the rice cooker main body so that it can be opened and closed, an inner pot detachably housed in the main body, a rice cooking heater provided on the inner bottom of the main body, and a rice cooking heater provided in the center of the rice cooking heater in the inner pot. The rice cooker has a rice cooking switch provided in pressure contact with each other, a heater for keeping warm provided on the inner surface of the main body, a temperature sensitive switch for keeping warm and a lid heater provided on the lower surface of the lid, and when the rice cooking switch is closed, Until the heat-retaining temperature-sensitive switch reaches a predetermined temperature, the rice-cooking heater, the heat-retaining heater, and the lid heater are energized to keep them warm, and from when the heat-retaining temperature-sensitive switch reaches the predetermined temperature, the rice-cooking heater operates. a rice-cooking heater so that when the rice-cooking switch is opened after the rice-cooking operation is operated, the heat-retaining temperature-sensitive switch maintains the temperature in the inner pot at a predetermined temperature;
An electronic jar rice cooker characterized by being provided with a relay coil having a contact point that controls energization of a heat-retaining heater and a lid heater to perform a heat-retaining operation.