JP2017202239A - rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice cooker that can cook rice at a desired burnt level that is specified by a burnt level specification part.SOLUTION: When a burnt level lighter than a standard burnt level is specified by the burnt level specification part 5, the rice cooker sets time obtained by subtracting a prescribed correction time ▵t that is set in accordance with a specified burnt level from a prescribed standard cooking completion time that is set corresponding to the standard burnt level, as a cooking completion time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rice cooker. In particular, the present invention relates to a rice cooker that can specify the degree of burning of cooked rice when cooked.

  Conventionally, a rice cooking heater that heats a rice cooker and a control unit that controls the rice cooking heater, a preliminary cooking process for impregnating rice grains with water, a main cooking process for evaporating the water in the rice cooking pot, and a rice cooking pot There is known a rice cooker in which a cooking process in which the inside is heated to a predetermined cooking temperature and a steaming process in which the cooked cooked rice is steamed are performed. When cooking rice with this kind of rice cooker, the cooking temperature in the cooking process is generally set to be higher than when cooking without cooking.

  However, the moisture evaporation temperature at which the water in the main cooking process evaporates differs depending on the type and quality of the rice, so if a single cooking temperature is set for the same level of burnt, the water in the main cooking process The temperature difference between the evaporation temperature and the cooking temperature in the cooking process is different. As a result, excessive and insufficient heating of the cooked rice may occur in the cooking process, and a desired burn condition may not be obtained. From the above viewpoint, the present applicant has previously proposed that in the cooking process, a temperature obtained by adding a predetermined correction temperature ΔT set according to the burnt eye level to the water evaporation temperature is set as the cooking temperature ( For example, Patent Document 1).

JP 2001-61649 A

  FIG. 4 is a temperature change of the detected temperature when the standard burnt eye level “0” is specified using a household rice cooker. The rice cooker for home use has a small rice cooker and a small amount of rice to cook. Therefore, when the cooked rice begins to burn, the ratio of the burned portion to the entire cooked rice amount increases, and the temperature change of the cooked rice in the cooking process greatly appears in the temperature of the cooker. Therefore, as in Patent Document 1, by increasing / decreasing the correction temperature ΔT for setting the cooking temperature, it is possible to finely control the cooked rice at any level of strength and weakness.

  However, a large rice cooker is used in a commercial rice cooker, and the amount of cooked rice increases. For this reason, even if partial scoring occurs, the entire temperature change is small, and heating to the extent that the temperature change appears makes it easier for the cooked rice to burn. When a strong burnt eye level is specified, the temperature difference between the water evaporation temperature and the cooking temperature becomes large, so it is considered possible to set the correction temperature ΔT to control the burn condition, but the weak burnt eye When the level is specified, the temperature difference between the water evaporation temperature and the cooked temperature is smaller in a large rice cooker as described above than in a small rice cooker even at the same burnt level. It is difficult to control. In particular, when a small amount of cooked rice is cooked with a large-sized rice cooker so as not to be burnt, it is necessary to finish heating before the temperature change appears in the cooking process. Therefore, in such a rice cooker, since correction temperature (DELTA) T like patent document 1 cannot be set, there exists a problem that a burning condition cannot be controlled.

  The present invention solves the above-mentioned problems, and an object of the present invention is to provide a rice cooker that can cook cooked rice with a desired burn condition specified by a burnt eye level specifying unit.

The present invention
A rice cooker that heats the rice cooker;
A temperature detector that detects the temperature in the rice cooker or the bottom of the rice cooker,
A burnt level designation unit capable of designating a predetermined standard burnt eye level and at least a burnt level weaker than the standard burnt eye level;
A controller for controlling the operation of the rice cooker heater,
In the rice cooker that performs the cooking process of heating so that the burnt eyes specified by the burnt eye level designation unit attach to the cooked rice,
When a burnt level that is weaker than the standard burnt eye level is specified by the burnt eye level specification unit, the control unit responds to the specified burnt eye level from a predetermined standard cooking time set for the standard burnt eye level. It is a rice cooker that sets a time obtained by subtracting a predetermined correction time Δt set as a cooking condition.

  According to the above rice cooker, if a burnt level that is weaker than the standard burnt eye level is specified in the burnt eye level specification unit, the burnt level is determined from the standard cooking time set for cooking at the standard burnt eye level. A time obtained by subtracting a predetermined correction time Δt set in accordance with is set as a cooking condition, and the end of the cooking process is determined. As a result, even when the temperature difference due to the burnt eye level is small or when it is necessary to end the heating before the temperature rise occurs in the cooking process, the degree of burning can be controlled regardless of the degree of temperature rise in the cooking process. .

In the above rice cooker, preferably,
The burnt eye level setting section can specify a burnt eye level that is stronger than the standard burnt eye level.
If the standard burnt level or the strong burnt eye level is specified by the burnt eye level specification unit, the control unit determines that the detection temperature detected by the temperature detection unit in the cooking process reaches a predetermined cooking determination reference temperature. A temperature obtained by adding a predetermined correction temperature ΔT set according to the burnt eye level designated as the reference temperature is set as the cooking condition.

At a strong burnt eye level, since a high cooked temperature is required, the temperature difference between a predetermined cooked determination reference temperature and the cooked temperature is increased according to the burnt level. Therefore, by setting the temperature obtained by adding the predetermined correction temperature ΔT to the cooking determination reference temperature as the cooking condition, it is possible to control the degree of burning.
And in the above rice cooker, even when the standard burnt eye level is designated, the temperature obtained by adding the correction temperature ΔT to the cooking determination reference temperature is set as the cooking condition to control the burning condition. The burnt level that produces a clear temperature difference from the temperature is set to the standard burnt level. Therefore, the standard cooking time corresponding to the standard burnt eye level can be set more accurately.

  As described above, according to the present invention, when a burnt level that is weaker than the standard burnt eye level is specified, regardless of the temperature change in the cooking process, the standard cooked food set according to the standard burnt eye level is set. Since the time obtained by subtracting the correction time △ t set according to the burnt level from the time is set as the cooking condition, the rice cooker with a small temperature difference due to the burnt level difference in the cooking process or the weak burnt level In the rice cooker where the temperature change does not appear in the cooking process when specified, the cooked rice can be cooked with a desired burn condition.

Drawing 1 is a schematic structure figure showing an example of a rice cooker concerning an embodiment of the invention. FIG. 2 is a graph showing changes in the detected temperature during the rice cooking operation of the rice cooker according to the embodiment of the present invention. FIG. 3 is a control flow diagram showing an example of rice cooking operation in the rice cooker according to Embodiment 1 of the present invention. FIG. 4 is a graph showing a change in the detected temperature during the rice cooking operation of a conventional household rice cooker.

Hereinafter, the rice cooker according to the present embodiment will be specifically described with reference to the drawings.
FIG. 1 is a schematic configuration diagram in which the rice cooker in the present embodiment is applied to a gas cooker for business use (for example, cooking 5 kg). As shown in FIG. 1, this rice cooker includes a rice cooker 1 in which an upper lid 11 is disposed, and a gas burner 2 (rice cooker) that is disposed on the bottom of the rice cooker 1 and heats the rice cooker 1. . In the gas circuit to the gas burner 2, a first gas valve 22, a second gas valve 23, and a proportional valve 24 are disposed in order from the upstream side, and the first gas valve 22 and the second gas valve 23 are connected to each other. A gas circuit to the pilot burner 26 is branched from between.

  The rice cooker is provided with a pot sensor 12 that comes into contact with the back surface of the top lid 11 of the rice cooker 1 and a pot bottom sensor 13 that comes into contact with the outer surface of the bottom of the rice cooker 1. The inside sensor 12 and bottom sensor 13 function as a temperature detection unit that detects the inside and bottom temperature of the rice cooker 1, and the detected detection signals are output to the control device 30 described later. .

  The rice cooker includes a burnt eye level designation unit 5 that designates the degree of burnt rice cooked by the user. The burnt eye level designation unit 5 includes an UP / DOWN counter 50, a burnt eye level increase button 51 connected to the UP input terminal, and a burnt eye level drop button 52 connected to the DOWN input terminal. Further, the output unit of the UP / DOWN counter 50 is connected to a burnt level indicator 55 provided with a burnt level display lamp 54. The burned rice level can be adjusted by the output of the burnt eye level specifying unit 5, for example, with the standard burnt eye level set to “0”, from “−5” to “+5” in 11 levels. .

  Furthermore, this rice cooker comprises a control device 30 that controls the operation of the gas burner 2 that functions as a rice cooker. The control device 30 includes a CPU, a ROM, a RAM, a timer, and a microcomputer in which a control program is stored. The first gas valve 22, the second gas valve 23, the proportional valve 24, and the hook sensor 12, the bottom sensor 13, the burnt level designation unit 5, and the burnt level indicator 55. Further, the microcomputer of the control device 30 has, as a functional component, a standard burnt level or a strong burnt level on the “+” side higher than the standard burnt eye level (hereinafter, “standard or strong burnt eye”). When “level” is designated), the cooking temperature setting unit 31 that sets the cooking temperature E of the cooked rice as the cooking condition, and the temperature changing unit that changes the correction temperature ΔT according to the standard or strong burnt level 32. When the “−” side weak burnt level (hereinafter referred to as “weak burnt level”) lower than the standard burnt eye level is designated by the burnt eye level specifying unit 5, the cooked rice cooking time e as a cooking condition The cooking time setting unit 33 for setting the time, the time changing unit 34 for changing the correction time Δt according to the weak burnt level, the gas bar Comprising a like heating capacity changing unit 35 for changing the Na 2 thermal (heating capacity). Further, in the memory of the control device 30, a correction temperature ΔT corresponding to the burnt level when the standard or strong burnt level is designated, and a correction time Δ corresponding to the burnt level when the weak burnt level is designated. t, a standard cooking time for setting a cooking time e when a weak burnt eye level is designated, and the like are stored. These are obtained by experiments.

  FIG. 2 is a temperature change of the bottom temperature detected by the bottom sensor 13 when the maximum amount of cooked rice is cooked with the standard burnt level “0” specified. The rice cooking operation in the rice cooker of the present embodiment will be schematically described with reference to FIG. 2. The cooking temperature setting unit 31 is a temperature gradient of the bottom temperature detected by the bottom sensor 13 in the cooking process. When the inflection point ((a) in FIG. 2) from which the value changes from negative to positive is set as the cooking determination reference temperature T0, and the standard or strong burnt eye level is specified by the burnt eye level specification unit 5, the cooking determination standard A temperature (T0 + ΔT) obtained by adding the correction temperature ΔT to the temperature T0 is set as the cooking temperature E. Although the water evaporation temperature in the main cooking process can also be set as the cooking reference temperature T0, the water evaporation temperature for evaporating the water in the rice cooker 1 may not be stable, but after the main cooking process. In the cooking process, the bottom temperature starts to rise after the water evaporates and the moisture in the rice cooker 1 becomes low. Therefore, the cooking judgment reference temperature is based on the inflection point of the temperature gradient of the bottom temperature in the cooking process. By setting T0, the temperature at which scorching starts more accurately can be used as a criterion.

  The temperature changing unit 32 sets the correction temperature ΔT higher as the burnt level specified by the burnt level specifying unit 5 becomes higher. As a result, when a standard or strong burnt level is specified, the same correction temperature ΔT can be obtained even if the cooking determination reference temperature is different due to a difference in the type or quality of rice if the burnt level is the same. Is set. Table 1 shows the correction temperature ΔT that is set when a standard or strong burnt eye level is specified in the rice cooker of the present embodiment.

  As shown in Table 1, in the present embodiment, when the standard or strong burnt eye level is designated, the correction temperature ΔT is set in 6 steps in increments of 6 ° C. within the range of 6 to 36 ° C. . Thus, when the standard or strong burnt eye level is designated, the temperature difference between the cooking determination reference temperature T0 and the cooking temperature E set as the cooking condition becomes large. Therefore, when a standard or strong burnt eye level is specified with a large rice cooker, the burn condition can be controlled by the correction temperature ΔT.

  On the other hand, the correction temperature ΔT when the standard burnt eye level is designated is 6 ° C. Therefore, when a weaker burnt eye level is designated, a plurality of burns are caused by the correction temperature ΔT of less than 6 ° C. It is difficult to control the condition. In particular, in order to cook a small amount of cooked rice with a large-sized rice cooker at a level of weak burnt so as not to be burnt, it is necessary to finish heating before a temperature change appears in the cooking process.

  For this reason, in this embodiment, when a weak burnt eye level is specified by the burnt eye level specification unit 5, the cooking time setting unit 33 sets the bottom temperature of the pot when the standard burnt eye level described above is specified. The time required to reach the temperature obtained by adding the correction temperature ΔT corresponding to the standard burnt eye level to the cooking determination reference temperature is set as the standard cooking time t0 (for example, 2100 seconds), and from the standard cooking time t0 The time (t0−Δt) obtained by subtracting the predetermined correction time Δt set according to the burnt eye level is set as the cooking time e. Thereby, cooked rice can be cooked according to the burnt eye level designated by the cooking time e without setting the cooking temperature E. In addition, when the standard burnt level is specified, the cooking condition can be set according to the cooking time, but in this embodiment, when the standard burning level is specified, the bottom temperature of the pot regardless of the cooking time. Since the cooking temperature is determined based on the cooking temperature E based on this, it is possible to control the scoring condition more accurately. Therefore, the standard cooking time is more accurate by using the standard cooking time when judging the cooking level at the standard burnt level by temperature control as the reference time for the cooking condition when the weak burning level is specified. Can be set.

  The time changing unit 34 sets the correction time Δt longer as the burnt level specified by the burnt level specifying unit 5 becomes lower. Thereby, when a weak burnt eye level is specified, the cooking time e arrives earlier as the burnt burner level becomes lower. Therefore, even with a large rice cooker, the amount of combustion can be reduced before it begins to burn. Table 2 shows the correction time Δt set when a weak burnt level is specified in the rice cooker of the present embodiment.

  As shown in Table 2, in the present embodiment, when a weak burnt eye level is designated, the correction time Δt is set in five stages in increments of 50 seconds within a range of 50 to 250 seconds. Thus, the time difference between the standard cooking time t0 and the cooking time e becomes larger as the level of the weaker burnt eyes. Therefore, even when a weak burnt eye level is specified on a large rice cooker, the burn condition can be controlled by the correction time Δt.

  Next, the rice cooking operation in the rice cooker of the present embodiment will be described with reference to the temperature change graph of the bottom temperature of FIG. 2 and the control flow diagram of FIG. In addition, in the rice cooker of this Embodiment, when a burnt eye level designation | designated part 5 does not designate a burnt eye level, it is comprised so that a standard burnt eye level may be set.

  When the user turns on the rice cooking switch (not shown), the timer is turned on, and it is determined whether or not a weak burnt eye level is designated by the burnt eye level designation unit 5 (steps ST1 to ST2).

  When a weak burnt eye level is specified in the burnt eye level specification unit 5, the correction time Δt corresponding to the specified burnt eye level is read, and the time obtained by subtracting the correction time Δt from the standard cooking time t0 is cooked. Set as time e (steps ST3 to ST4).

  Subsequently, the 1st gas valve 22, the 2nd gas valve 23, and the proportional valve 24 are opened, the gas burner 2 is ignited, and a preliminary cooking process is performed (step ST5-ST6). In this preliminary cooking process, the opening of the proportional valve 24 is adjusted to control the amount of combustion of the gas burner 2, and the rice cooker 1 is heated so that the bottom temperature becomes a predetermined preliminary cooking temperature (eg, about 50 ° C.). To do. Thereby, the moisture content of the rice grain in the rice cooker 1 increases.

  When the predetermined pre-cooking time has elapsed, the pre-cooking process is terminated and the process proceeds to the main cooking process (step ST7). In the main cooking step, the temperature raising step B1 and the water evaporation step B2 are sequentially performed (see FIG. 2).

  In the temperature raising step B1, the rice cooker 1 is heated until the inside of the rice cooker 1 is in a boiling state. At this time, the combustion amount of the gas burner 2 is controlled so that the inside of the rice cooker 1 is in a boiling state. For example, when the temperature at the bottom of the kettle reaches a predetermined boiling temperature (for example, 120 ° C.), the boiling state is maintained until the water in the rice cooker 1 is substantially evaporated. Will also be moderate. For this reason, when a change in the temperature gradient is detected from the temperature curve and the temperature gradient becomes equal to or less than a predetermined value, the process proceeds to the water evaporation step B2.

  In the water evaporation step B2, the rice cooker 1 is heated until the water in the rice cooker 1 is substantially evaporated. And if the water | moisture content in the rice cooking pot 1 runs out in a water | moisture content evaporation process, the bottom temperature will rise rather than a water | moisture-content evaporation temperature, and a temperature gradient will change from negative to positive. For this reason, when the change of the temperature gradient is detected from the temperature curve and an inflection point of the temperature gradient appears, the process proceeds to the cooking process (step ST8).

  Then, in the cooking step, heating is continued with the proportional valve 24 set to a predetermined opening (for example, medium) until the cooking time e corresponding to the weak burnt level specified by the burnt level specifying unit 5 elapses. (Step ST9). As described above, in the present embodiment, when a weak burnt eye level is specified, the standard burnt eye is used by using the correction time Δt set according to the burnt eye level without depending on the correction temperature ΔT. When the cooking time e is set to a time (t0-Δt) that is shorter than the standard cooking time t0 set corresponding to the level as the cooking time e, the temperature difference due to the difference in burnt eye level is small However, the burn condition can be controlled according to the burnt eye level. In addition, according to the present embodiment, the cooking time is set as the cooking condition regardless of the cooking temperature in the cooking process, and therefore a temperature increase in the cooking process is not required for completion determination of cooking. Therefore, even with a rice cooker in which the scoring condition cannot be controlled by the correction temperature ΔT, the cooked rice can be cooked with a desired scoring condition.

  When the cooking time e arrives as described above, a steaming step is performed in which the first and second gas valves 22 and 23 are closed to extinguish the gas burner 2 and the cooked rice in the rice cooker 1 is steamed for a predetermined time. And the whole rice cooking process is complete | finished by completion | finish of this steaming process (step ST10-ST11).

  On the other hand, when the burnt eye level designation unit 5 does not designate a burnt eye level or when a standard or strong burnt eye level is designated, the correction temperature ΔT corresponding to the burnt eye level is read and the gas burner 2 is ignited. (Steps ST12 to ST13). Next, after the preliminary cooking process and the main cooking process described above are executed and the process moves to the cooking process (steps ST14 to ST16), the temperature at the inflection point where the temperature gradient of the bottom temperature changes from negative to positive. ((A) of FIG. 2) is set as the cooking reference temperature T0, and the temperature (T0 + ΔT) obtained by adding the correction temperature ΔT according to the burnt eye level to the cooking determination reference temperature T0 is set as the cooking temperature E. Set (steps ST17 to ST18). And when the pot bottom temperature becomes the set cooking temperature E, the gas burner 2 is extinguished, a predetermined steaming process is performed, and the whole rice cooking process is complete | finished (step ST19 and steps ST10-ST11).

  Thus, in the rice cooker according to the present embodiment, at the weak burnt level, the correction set according to the designated burnt level from the standard cooking time t0 set corresponding to the standard burnt level. The time (t0−Δt) obtained by subtracting the time Δt is set as the cooking time e, and the standard burnt eye level or the strong burnt eye level is set according to the burnt eye level specified for the cooking determination reference temperature T0. Since the temperature (T0 + ΔT) obtained by adding the corrected temperature ΔT is set as the cooked temperature E, the cooked rice with the desired charcoal condition is cooked regardless of the level of charred on the large rice cooker. Can do.

(Other embodiments)
(1) In the above embodiment, the median value of the strong burn level and the weak burnt level is set as the standard burnt level, but the burnt level that is stronger or weaker than the median is set as the standard burnt level. May be. In this case, similarly to the above embodiment, it is preferable to set the burnt level at which the cooking temperature can be determined by the correction temperature ΔT to the standard burnt level.
(2) In the above embodiment, a fixed correction time Δt is set regardless of the amount of cooked rice, but the correction time Δt may be changed according to the amount of cooked rice.
(3) In the above embodiment, after shifting to the cooking process, it is determined whether the cooking time has been set according to the burnt eye level, but in the case of a rice cooker that is easily burned, it is cooked. You may set so that cooking time may come during the main cooking process before an up process.
(4) In the said embodiment, although the gas rice cooker using a gas burner was mentioned as a rice cooker, you may apply to the electric rice cooker using an electric heater.
(5) In the above embodiment, the bottom temperature detected by the bottom sensor is used as the detected temperature, but the bottom temperature detected by the bottom sensor may be used.

DESCRIPTION OF SYMBOLS 1 Rice cooker 2 Gas burner 5 Burnt level designation | designated part 13 Pot bottom sensor 30 Control apparatus

Claims (2)

A rice cooker that heats the rice cooker;
A temperature detector that detects the temperature in the rice cooker or the bottom of the rice cooker,
A burnt level designation unit capable of designating a predetermined standard burnt eye level and at least a burnt level weaker than the standard burnt eye level;
A controller for controlling the operation of the rice cooker heater,
In the rice cooker that performs the cooking process of heating so that the burnt eyes specified by the burnt eye level designation unit attach to the cooked rice,
When a burnt level that is weaker than the standard burnt eye level is specified by the burnt eye level specification unit, the control unit responds to the specified burnt eye level from a predetermined standard cooking time set for the standard burnt eye level. A rice cooker that sets a time obtained by subtracting a predetermined correction time Δt set as a cooking condition. In the rice cooker according to claim 1,
The burnt eye level setting section can specify a burnt eye level that is stronger than the standard burnt eye level.
If the standard burnt level or the strong burnt eye level is specified by the burnt eye level specification unit, the control unit determines that the detection temperature detected by the temperature detection unit in the cooking process reaches a predetermined cooking determination reference temperature. The rice cooker which sets the temperature which added predetermined correction temperature (DELTA) T set according to the burnt eye level designated as reference | standard temperature as a cooking condition.

Images