JPH069529B2 - rice cooker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rice cooker having a microcomputer-controlled boiling detection device.

2. Description of the Related Art In a conventional rice cooker, as shown in FIG. 6, a temperature sensor for detecting a rapid temperature rise at the bottom of the inner pot at the end of rice cooking and a lid provided inside the lid to detect boiling Some have sensors.

Problems to be Solved by the Invention However, the rice cooker according to the present invention requires two sensors, which increases the cost. For this reason, there is also a thing that the rice cooking power is reduced before boiling without providing the lid sensor.

Means for Solving the Problems The present invention has been made to eliminate the above drawbacks,
The purpose is to obtain a rice cooker that cooks delicious rice by detecting the boiling point with a single sensor and omitting the parts and controlling the effective supply of rice cooking power. For that purpose, it is equipped with an energization control means for controlling energization to the rice cooking heater according to a preset energization program, and the energization is stopped after energizing the rice cooking heater for a certain period of time, and the output temperature of the temperature sensor for detecting the temperature at the time of starting energization again. The boiling state is determined by comparing with a preset constant temperature in the boiling detection device. Further, the rice cooking heater is continuously energized until another certain temperature is detected by the temperature sensor, and then the energization control means controls the energization of the rice cooking heater according to the time program.

Action By doing so, the boiling state can be reliably detected with one sensor, and the rice heating heater can be efficiently energized.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The configuration of this embodiment is as shown in FIG. 1, and FIGS. 2 and 3 similarly show the output temperature characteristics of the temperature sensor and the energized state by the time program, and FIG. 4 shows a diagram for explaining the operation. Show each. In the figure, reference numeral 1 designates a bottomed tubular main body in which a removable inner pot 2 is housed. Three
Is attached to the inside of the main body 1 by a rice cooking heater so as to be in close contact with the outer bottom of the inner pot 2 and heats the inner pot 2. A temperature sensor 5 is attached so as to be in close contact with the outer bottom of the inner rice cooker 2, and is positioned so as to project from a hole formed in the center of the rice cooker 3 so as not to come into contact with the rice cooker 3. It detects the temperature. An energization control unit 4 is provided inside the main body 1 and includes a time program 6 including a microcomputer and the time program 6.
According to the contact part 7 which is turned on and off according to
The energization to the rice cooking heater 3 is controlled through the ON-OFF operation of. Reference numeral 8 denotes a lid, which covers the main body and the upper opening of the inner pot 2. Reference numeral 9 denotes a boiling detection device, which is composed of a microcomputer provided inside the main body, and judges the boiling state by comparing a preset constant temperature T with a temperature T'output from the temperature sensor 5. Is to do. 10 is a power source for connecting the rice cooking heater 3 and the contact portion 7 in series.

Next, the operation of this embodiment will be described.

When a user puts washed rice and an appropriate amount of water into the inner pot 2 and operates a rice cooking switch (not shown), the energization control means 4
The time program 6 in the inside starts operating, the contact portion 7 is closed for the first energization time θ contained in the time program 6, and the rice cooking heater 3 is energized. After the end of the first energization time θ, the contact portion 7 is opened and the energization of the rice cooking heater 3 is suspended during the energization suspension time contained in the time program 6 (Figs. 2 and 3 '). The output temperature of the temperature sensor 5 is input to the boiling detection device 9 after the energization stop time,
When the temperature is higher than a preset constant temperature T, a boiling signal is output (Fig. 3 '), and when the temperature is lower than it, an unboiling signal is output (Fig. 2). When the non-boiling signal is output, the contact portion 7 is closed during the second energization time (θ 'in FIG. 2) contained in the time program 6, and the rice cooking heater 3 is energized. After that, the temperature sensor 5 goes through an energization pause again during the energization pause time.
Is output to the boiling detection device 9 (FIG. 2). Here, when the temperature is higher than the constant temperature T of the boiling detection device 9, the boiling signal is output, and when it is lower, the third energizing time (θ ″ in FIG. 2), the fourth energizing time ... Until the boiling signal is output thereafter. , And the output temperature of the temperature sensor 5 is input to the boiling detection device 9 at each end of the energization pause time during this period, so that when the boiling signal is output from the boiling detection device 9, the boiling state is continued. The effective supply control of the rice cooking power is performed by controlling the electricity supply such as lowering the rice cooking power with an energization program suitable for.

Further, as in another embodiment of FIG. 5, the rice cooker is energized through the energization control means until the output temperature of the temperature sensor after the rice cook switch operation detects a certain constant temperature T ′ different from the constant temperature T. It is also possible to execute the above-mentioned time program after carrying out and detecting.

EFFECTS OF THE INVENTION As described above, according to the present invention, the rice is cooked in accordance with the energization cycle of energization-pause-re-energize-re-pause-re-energize ... defined in the output temperature of one temperature sensor, that is, the time program stored in the energization control means. The heater is energized, and the temperature before re-energization and re-energization is compared with the constant temperature in the boiling detection device to determine unboiling and boiling, so it is possible to save parts , It is possible to obtain a rice cooker that can cook delicious rice by performing effective supply control such as lowering the rice cooking power after detecting boiling.

[Brief description of drawings]

FIG. 1 is a perspective view of a rice cooker according to an embodiment of the present invention when the inner pot is taken out, and FIGS. 2 and 3 are output temperatures of the same temperature sensor when the amount of cooked rice is large and small, and the inner pot. FIG. 4 is a characteristic diagram showing the correlation between the internal temperature and the energization state of the rice cooking heater, FIG. 4 is a diagram for explaining the same operation, and FIG. 5 is the output temperature of the temperature sensor showing another embodiment, A characteristic diagram showing the correlation between the temperature inside the cooker and the energized state of the rice cooker. Fig. 6 shows the correlation between the output temperature of the temperature sensor of the conventional rice cooker, the temperature inside the inner cooker and the energized state of the rice cooker. FIG. 3 ... rice cooking sensor, 4 ... energization control means, 5 ... temperature sensor, 6 ... time program, 9 ... boiling detection device, T ... constant temperature, T '... certain constant temperature.

Claims (2)

[Claims] 1. A rice cooker comprising a main body provided with a rice cooking heater for heating a detachably housed inner pot and a temperature sensor for detecting the temperature of the inner pot, according to a preset time program (6). The energization control means (4) for controlling the energization to the heater (3) and the energization control means (4) are used to energize the rice cooking heater (3) for a certain period of time to stop energization,
It is equipped with a temperature sensor (5) that detects the temperature at the start of re-energization and a boiling detection device (9) that stores a preset constant temperature (T) and outputs a boiling signal or a non-boiling signal,
A rice cooker characterized by using the result of comparison between the temperature at the start of re-energization and the constant temperature (T) via the boiling detection device (9) for judging the boiling state. 2. The energization control means (4) continuously energizes the rice cooking heater (3) until a certain temperature (T ') is detected by the temperature sensor (5), and after detecting the temperature (T'). The preset time program (6)
The rice cooker according to claim 1, wherein energization of the rice cooker heater (3) is controlled in accordance with the above.