JPH0646949A - Rice boiler - Google Patents

Abstract

PURPOSE:To protract the period of time, during which rice is changed into an alpha-state, to contrive to improve the finish of rice boiling by once stopping boiling rice and heating through the output of a controller, when the detected temperature of a temperature sensor reaches a first temperature; thereafter by resuming the boiling rice and heating, when a set-up time elapses; and by causing the boiling rice and heating to progress, until the detected temperature of the temperature sensor reaches a second temperature. CONSTITUTION:When the start signal of starting boiling rice is inputted, an on-off valve 21 is opened and an igniter 3 operates for a given period of time so that a spark discharge occurs in the burner port of a gas burner 10 and the gas burner 10 ignites and boiling rice and heating progresses. With the progress of the boil heating, the temperature in a rice boiler 1 rises, which temperature is monitored by a temperature sensor S. When the detected temperature of the temperature sensor S reaches a first temperature A1, the on-off valve 21 is closed. After that, the stopped state of heating continues for a given period of time. After the lapse of the given period of time, a reigniting operation is carried out so that the boiling rice and heating is resumed. When the temperature in the rice boiler 1 rises again and the detected temperature of the temperature sensor S reaches a second temperature A2, the on-off valve 21 is closed so that the boiling rice and heating is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker, and more particularly to a rice cooker of a type in which the rice cooking power is changed from the start of rice cooking to the end of rice cooking.

[0002]

2. Description of the Related Art As the above-mentioned type, there is a type of rice cooker in which the heating power is temporarily weakened when the temperature in the rice cooker approaches the temperature at which the rice has been cooked. The structure shown in FIG. 1 is generally adopted. . In this case, the temperature of the bottom of the rice cooker (1) is detected by the temperature sensor (S). On the other hand, the gas burner (10) for heating the rice cooker (1) faces the bottom of the rice cooker (1), and the gas circuit to this is connected to the main gas circuit (2a) equipped with the on-off valve (21). A bypass circuit (2b) that bypasses this is provided, and an orifice (22) is inserted in this bypass circuit (2b). The on-off valve (21) is a temperature sensor.
It is controlled by the control unit (C) that inputs the temperature detected by (S).

In this conventional rice cooker, after the rice is cooked, gas is supplied to the gas burner (10) with the opening / closing valve (21) opened, and the heating power of the gas burner (10) depends on the diameter of the nozzle (N). It corresponds to the set supply gas amount. In other words, the cooked rice is heated by high heat. The temperature of the bottom of the rice cooker (1) at this time is detected by the temperature sensor (S), and this detected temperature is the temperature at which the rice heating is completed (hereinafter referred to as the second temperature (A
₂ )) a certain temperature lower than the set temperature (hereinafter referred to as the first temperature)
(A ₁ )), the heating of the cooked rice proceeds with the on-off valve (21) closed by the action of the control device (C). At this time, the amount of gas to the gas burner (10) is limited by the orifice (22), and the heating power of the gas burner (10) becomes weak.

Therefore, as shown in FIG. 2, in the section from the first temperature (A ₁ ) to the second temperature (A ₂ ) in the rice cooker (1), the temperature rising gradient in the rice cooker (1) is increased. Becomes smaller, and the time in which the inside of the rice cooker (1) is maintained in the high temperature region becomes longer than in the case where the above control is not performed. In other words, the rice cook heating stop time can be delayed, and the α-formation time (the time to change the starch quality to α-starch by maintaining the temperature of rice during cooking at 98 ° C or higher) is set accordingly. This improves the cooked rice.

However, even this conventional one has a problem that the α-formation time cannot be sufficiently long. INDUSTRIAL APPLICABILITY The present invention relates to a rice cooker (1) which is heating rice with a temperature sensor (S)
In the rice cooker that detects the temperature inside and stops heating the rice when the detected temperature reaches the second temperature (A ₂ ) that corresponds to the heating end temperature for cooking rice, the α conversion time can be further extended. In this way, the task is to improve cooking.

[0006]

[Technical Means] The technical means of the present invention taken in order to solve the above-mentioned problem is that "the temperature detected by the temperature sensor (S) is lower than the second temperature (A ₂ ) by a constant temperature (A ₁ )), A control device (C ₁ ) for temporarily stopping the heating of the cooked rice and restarting the cooked rice heating after the elapse of the set time is provided.

[0007]

The above technical means operates as follows. It is the same as the conventional rice cooker that the heating of the cooked rice is finally stopped when the temperature detected by the temperature sensor (S) reaches the second temperature (A ₂ ), but before that, the temperature sensor (S) When the detected temperature of No. 1 reaches the first temperature (A ₁ ), the heating of the cooked rice is temporarily stopped by the output of the control device (C ₁ ). After that, when this state elapses for a set time, the cooking rice heating is restarted and the cooking rice heating proceeds until the temperature detected by the temperature sensor (S) reaches the second temperature (A ₂ ).

In the above heating control, when the temperature detected by the temperature sensor (S) reaches the first temperature (A ₁ ), the heating is stopped, so the temperature in the rice cooker (1) temporarily drops. It is then raised to the second temperature (A ₂ ) by reheating. Therefore, the first
Compared to those controlled by the low heat heating when it becomes the temperature (A _1), the time required from when it becomes the first temperature (A ₁₎ to a second temperature (A ₂₎ is long.

[0009]

[Effect] Since the time required to reach the second temperature (A ₂ ) from the time when the temperature reaches the first temperature (A ₁ ) becomes long, the α-formation time becomes longer and the cooked-up temperature is further improved.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiment shown in the drawings, the present invention is applied to a gas rice cooker, and the temperature inside the rice cooker (1) is detected by a temperature sensor (S) placed in contact with the bottom of the rice cooker. The rice cooker (1) is heated by the gas burner (10),
The gas circuit to this gas burner (10) has a control device described later.
An electromagnetic on-off valve that is controlled to open and close by the output from (C)
(21) is inserted. The spark plug (31) of the igniter (3) faces near the flame hole of the gas burner (10), and this igniter (3) is also controlled by the control device (C), and the ignition signal is sent to the control device (C). When is input, it operates for a fixed time.

A microcomputer is used as the control device (C), and a program based on the flowchart shown in FIG. 5 is executed. The control operation will be described below with reference to FIG. When the start signal to start cooking rice is input, the on-off valve (21) is opened and the igniter (3)
Operates for a certain period of time and spark discharge occurs in the flame hole portion of the gas burner (10), the gas burner (10) ignites, and heating of cooked rice proceeds.
Although not shown in FIG. 5, it is determined whether or not the gas burner (10) is ignited during operation of the igniter (3), and if not ignited, the on-off valve (21) is closed. Equipped with safety equipment.

As the cooking rice heating progresses, the temperature in the rice cooker (1) rises as shown in FIG. 4, and this temperature is monitored by the temperature sensor (S). When the temperature detected by the temperature sensor (S) reaches the first temperature (A ₁ ), this is judged in step (41) and the on-off valve (21) is closed. Then, this heating stopped state continues for a certain period of time. This allows the rice cooker
Although the temperature inside (1) decreases by a certain temperature, the heating stop time is set to a predetermined time, and after this set time has elapsed, the re-ignition operation from step (42) to step (45) is executed to cook rice. Heating is restarted.

As a result, when the temperature in the rice cooker (1) rises again and the temperature detected by the temperature sensor (S) reaches the second temperature (A ₂ ), the on-off valve (21) is closed to heat the rice. Be stopped. In this embodiment, steps (41) to (45) function as the control device (C ₁ ). Also, the first temperature (A ₁ ) = 125
℃, the second temperature (A ₂ ) = 145 ℃, once the rice heating is stopped, the time until reheating is executed, that is, the re-ignition standby time (T) is set to about 60 seconds. There is.

The temperature detected by the temperature sensor (S) at the start of reignition is preferably 100 ° C. or higher. Further, when comparing the gas rice cooker of this embodiment with the conventional gas rice cooker described above,
The conventional type requires a pilot burner (11) (see Fig. 1) to secure the stability of the flame in a low heat heating state.
According to the present invention, since the gas burner (10) is once extinguished and then re-ignited, it is not necessary to provide a circuit for (11) in the gas circuit. Further, the orifice (22) and the like are also unnecessary.

From the above, the gas cooker of the embodiment of the present invention can greatly simplify the structure of the gas circuit as compared with the conventional one. In addition, in the said Example, although this invention was implemented in the gas rice cooker, it cannot be overemphasized that this can be implemented in an electric rice cooker.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional example.

[Fig. 2] An explanatory view showing temperature changes in the rice cooker (1) in the rice cooking process.

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

FIG. 4 is an explanatory view showing a temperature change in the rice cooker (1) in the rice cooking process.

FIG. 5 is a flowchart of the control device (C).

[Explanation of symbols]

(1) ・ ・ ・ Rice cooker (S) ・ ・ ・ Temperature sensor (A ₂ ) ・ ・ ・ Second temperature (C ₁ ) ・ ・ ・ Control device (1) ・ ・ ・ Gas burner (21) ・ ・ ・ Open / close valve

Claims (3)

[Claims] 1. The temperature sensor (S) detects the temperature inside the rice cooker (1) while heating the rice, and when the detected temperature reaches the second temperature (A ₂ ) corresponding to the rice heating end temperature. In a rice cooker that stops heating rice, a temperature sensor (S)
The first temperature at which the detected temperature is lower than the second temperature (A ₂ ) by a certain temperature
(A ₁ ) A rice cooker equipped with a control device (C ₁ ) that temporarily stops cooking rice heating and then restarts cooking rice heating after a set time has elapsed. 2. The temperature inside the rice cooker (1) when heating the rice is restarted
The rice cooker according to claim 1, which has a temperature of 100 ° C or higher. 3. A rice cooker, a rice cooker (1), and a gas burner (10)
Gas cooker of the type to be heated by the controller (C ₁ )
The rice cooker according to claim 1 or 2, wherein the on-off valve (21) inserted into the gas circuit to the gas burner (10) is controlled to open and close, and the ignition device to the gas burner (10) is controlled. .