JPS6238114A - 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 rice cooker having a microcomputer-controlled boiling detection device.

BACKGROUND OF THE INVENTION Conventional rice cookers, as shown in Figure 6, have a temperature sensor that detects a sudden rise in temperature at the bottom of the inner pot when rice cooking is finished, and a lid that is installed inside the lid to detect boiling. Some are equipped with sensors.

Problems to be Solved by the Invention However, such a rice cooker requires two sensors, which increases the cost. For this reason, some rice cookers did not have a lid sensor and the power for cooking rice was reduced before the rice boiled.

Means for Solving the Problems The present invention has been made to eliminate the above-mentioned drawbacks.
By detecting boiling using a single sensor, the number of parts can be omitted, and by effectively controlling the supply of rice cooking power, it is possible to obtain a rice cooker that can cook delicious rice. To this end, it is equipped with an energization control means that controls the energization of the rice cooking heater according to a preset energization program, and after energizing the rice cooking heater for a certain period of time, the energization is stopped, and the output temperature of a temperature sensor that detects the temperature when energization is started again. The boiling state is determined by comparing the boiling temperature 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.

Function: By doing this, the boiling state can be reliably detected with one sensor, and electricity can be efficiently supplied to the rice cooking heater.

Example 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, FIGS. 2 and 6 similarly show the output temperature characteristics of the temperature sensor and the energization state according to the time program, and FIG. 4 similarly illustrates the operation. are shown respectively. In the figure, reference numeral 1 denotes a cylindrical main body with a bottom, in which a removable inner pot 2 is housed. Reference numeral 6 denotes a rice cooking heater which is mounted inside the main body 1 so as to be in close contact with the outer bottom of the inner pot 2 and heats the inner pot 2. 5 is a temperature sensor installed so as to be in close contact with the outer bottom of the inner pot 2,
The foot is positioned so as to protrude from the hole formed in the rice cooker heater 6 and does not come into contact with the rice cooker heater 6.
This detects the temperature at the bottom of the inner pot 2. Reference numeral 4 denotes an energization control means which is provided inside the main body 1 and controls the ON-OFF operation of the contact section 7 from a time program 6 such as a microcomputer and a contact section 7 which operates ON-OFF according to the time program B. The power supply to the rice cooking heater 6 is controlled through the power supply. 8 is the lid body, 9 is the main body and inner pot 2
It covers the upper opening of. Reference numeral 9 denotes a boiling detection device, which is a microcomputer installed inside the main body, and which detects a preset constant temperature T and a temperature sensor 5.
The boiling state is determined by comparing the temperature T output from the boiling point. 10 is a power source that connects the rice cooking heater 6 and the contact portion 7 in series.

Next, the operation of this embodiment will be described.

When the user puts washed rice and an appropriate amount of water into the inner pot 2 and operates the rice cooking switch (not shown), the energization control means 4 is activated.
The time program 6 starts operating, the contact portion 7 closes for the first energization time θ included in the 9-hour program 6, and the rice cooking heater 6 is energized. At the end of 9 hours after the end of the first energization time θ, the indirect 4 part 7 of the energization stop time stored in the duram O is opened and the energization to the rice cooking heater 6 is stopped (Fig. 2 ■ and Fig. 6 ■ ° ). After the energization stop time ends, the output temperature of the temperature sensor 5 is input to the boiling detection device 9.

If the temperature is higher than the preset constant temperature T, a boiling signal is output (■° in Figure 6), and if it is lower than the constant temperature T, a boiling signal is output (■ in Figure 2). When the non-boiling signal is output, the second energizing signal stored in the time program 6 is energized to the A filter 6. Thereafter, the output temperature of the temperature sensor 5 is inputted to the boiling detection device 9 after the power supply is stopped again during the power supply stop time (Fig. 2
). Here, if the temperature is higher than the constant temperature T of the boiling detection device 9,
If the boiling signal is output and it is low, the current is applied for the sixth energization time (Fig. 2, θ), 3, the fourth energization time, and so on until the boiling signal is output, and each energization period during this period is The output temperature of the temperature sensor 5 is input to the boiling detection device 9 every time the rest period ends. Therefore, when a boiling signal is output from the boiling detection device 9, from then on, power supply control such as reducing the rice cooking power is performed with a power supply program appropriate for the boiling state, thereby performing effective supply control of the rice cooking power.

Further, as in another embodiment shown in FIG. 5, after the rice cooking switch is operated, the rice cooking heater is energized via the energization control means until the output temperature of the temperature sensor detects a certain constant temperature T' different from the constant temperature T. The above time program may be executed after detection.

Effects of the Invention As described above, according to the present invention, the output temperature of one temperature sensor, that is, 9 energization/stop-re-energization-re-stop-re-re-energization specified in the time program stored in the energization control means.
- The rice cooking heater is energized according to the energization cycle, and the temperature before re-energization and re-energization is compared with a constant temperature in the boiling detection device to determine whether the rice has boiled or has boiled, which saves labor in one part. This makes it possible to detect boiling and then perform effective supply control such as lowering the rice cooking power to obtain a rice cooker that can cook delicious rice.

[Brief explanation 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 being taken out, and FIGS. 2 and 6 are the output temperatures of the same temperature sensor and the inner pot when the amount of rice to be cooked is large and small. A characteristic diagram showing the correlation between the internal temperature and the energization state to the rice cooking heater. Figure 4 is a diagram to explain the same operation. Figure 5 is a diagram showing the output temperature of the temperature sensor and the internal temperature that shows an example of the same operation. The temperature inside the pot. The characteristic diagram which shows the correlation of the electricity supply state to a rice-cooking heater. FIG. 6 is a characteristic diagram showing the correlation between the output temperature of a temperature sensor of a conventional rice cooker, the temperature inside the inner pot, and the power supply state to the rice cooking heater. 6...Rice cooking heater, 4...Electrification control means. 5...Temperature sensor, 6...Time program. 9... Boiling detection device, T... Constant temperature. T"...a certain temperature.

Claims (1)

[Scope of Claims] 1. A rice cooker equipped with a main body equipped with a rice cooking heater that heats a removably housed inner pot, and a temperature sensor that detects the temperature of the inner pot. ) and an energization control means (4) that controls energization to the rice cooking heater (3) according to the energization control means (4), and after energizing the rice cooking heater (3) for a certain period of time, the energization is stopped and the energization is started again. Temperature sensor (5
) and a preset constant temperature (T), as well as a boiling detection device (9) that outputs a boiling signal or a non-boiling signal.
), wherein a comparison result between the temperature at the start of re-energization and the constant temperature (T) via the boiling detection device (9) is used to determine a boiling state. 2. The energization control means (4) continues to energize the rice cooking heater (3) until a certain constant temperature (T') is detected by the temperature sensor (5), and after detecting the temperature (T'), the electricity is set in advance. The rice cooker according to claim 1, wherein energization to the rice cooking heater (3) is controlled according to the time program (6).