JP2009136540A - Rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe rice cooker capable of preventing a component configuring the rice cooker from being melted or discolored even in an abnormal using state wherein the temperature of a detection means is lower than the temperature of a pot when cooking rice in a burned rice cooking course. <P>SOLUTION: A first prescribed temperature when cooking is completed and a second prescribed temperature higher than the first prescribed temperature are provided. After detecting the first prescribed temperature and before detecting the second prescribed temperature, a cooking program is shifted to the next process at the point of time that the prescribed time elapses. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rice cooker.

  In recent years, interest in “food” in the world including food education has been increasing. Interest in rice is also the same, and rice cookers are equipped with not only cooking programs that prevent the rice at the bottom of the pot from scorching to cook delicious rice, but also those equipped with a cooking program that allows charred eyes to be formed It has become widespread. For example, as disclosed in Patent Document 1, the cooked rice is provided with a charred rice cooking means for controlling the cooked rice heating means so as to be held at a temperature higher than the cooking temperature for a predetermined time after the completion of cooking.

Moreover, as for the rice cooker which mounts the cooking program which was made to form a brown eye, as disclosed by patent document 2, for example, the heating temperature of the pot is higher than the heating temperature in the normal rice cooking heating control mode, The rice cooking control means includes rice cooking control by executing the rice cooking control in the rice heating process including a predetermined heating stop control time.
Japanese Patent No. 3060962 JP 2003-325331 A

  However, in a conventional rice cooker, a foreign object enters between the pan and the detection means for detecting the temperature of the pan, and the abnormal use state that the user does not intend is such that the temperature of the detection means is lower than the temperature of the pan. In this case, even if the temperature of the pan rises, the temperature of the detection means does not reach the temperature at which the burnt can be formed (hereinafter, the heating temperature), and the heating continues. Therefore, there existed a subject that the pan will be in an excessively high temperature state, and the parts constituting the rice cooker will melt or discolor.

  Therefore, the present invention is intended to solve such a conventional problem, and in a rice cooker equipped with a cooking program (hereinafter referred to as a rice cooking course) capable of forming charred rice, the temperature of the pot and the pot In an abnormal use state where foreign matter enters between the detection means and the temperature of the detection means is lower than the temperature of the pan, the detection means does not reach the heating temperature, and the cooking temperature is lower than the cooking completion temperature Heating is continued at a high temperature and the pan is prevented from becoming excessively hot. After detecting the cooking completion temperature, a predetermined time elapses before detecting a predetermined temperature higher than the cooking completion temperature. At that time, the cooking program is transferred to the next process. Thereby, it aims at providing the safe rice cooker which prevented beforehand that the components which comprise a rice cooker will melt | dissolve or discolor.

  In order to achieve the above object, the present invention provides a main body having an open top surface, a lid that covers the upper surface opening of the main body so as to be openable and closable, lid temperature detecting means disposed in the lid, and detachable from the main body. A pan stored in the pan, a pan temperature detecting means for detecting the temperature of the pan, a time measuring means for measuring time, a heating means for heating the food in the pan, and a control means for controlling the heating means, Then, the cooked food in the pan is heated and has a first predetermined temperature at the completion of cooking and a second predetermined temperature higher than the first predetermined temperature, and the first predetermined temperature is detected. The cooking program is shifted to the next step when a predetermined time elapses before the second predetermined temperature is detected.

  As a result, foreign matter enters between the pan and the detection means for detecting the temperature of the pan, and in an abnormal use state where the temperature of the detection means is lower than the temperature of the pan, the temperature is higher than the cooking completion temperature. It is possible to provide a safe rice cooker in which heating is not continued, the pan is prevented from becoming an excessively high temperature state, and components constituting the rice cooker are prevented from melting or discoloring in advance.

  The rice cooker of the present invention avoids the pan from becoming an excessively high temperature state in an abnormal use state where the temperature of the detection means is low relative to the temperature of the pan when cooking on the rice cooking course, It is possible to provide a safe rice cooker that prevents the components constituting the material from melting or discoloring.

  According to the first aspect of the present invention, there is provided a main body having an upper surface opened, a lid body that covers the upper surface opening of the main body so as to be openable and closable, lid temperature detecting means disposed in the lid body, and detachably stored in the main body. A pot to be heated, a pot temperature detecting means for detecting the temperature of the pot, a time measuring means for measuring time, a heating means for heating the food in the pot, and a control means for controlling the heating means, The cooked food in the pan is heated and has a first predetermined temperature at the completion of cooking and a second predetermined temperature higher than the first predetermined temperature, and the first predetermined temperature is detected. Then, before detecting the second predetermined temperature, the cooking program is shifted to the next step when a predetermined time has elapsed, and between the pan and the detecting means for detecting the temperature of the pan. Abnormal use condition where a foreign object enters and the temperature of the detection means is lower than the temperature of the pan Oite, pan can provide excess avoids a high temperature condition, safe cooker parts is prevented that melts or discoloration constituting the cooker.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
The rice cooker in the 1st Embodiment of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view in the front-rear direction of the rice cooker according to the first embodiment of the present invention, in which a substantially cylindrical main body 10 and a lid 20 that covers the upper surface thereof are installed so as to be freely opened and closed. Reference numeral 22 denotes a lid body temperature detecting means disposed in the lid body 20. The pan housing part 30 of the main body 10 is composed of a protective frame 32 and an upper body coil base 31. A pan 11 is made of a magnetic material such as stainless steel or iron. The pan 11 has a gap between the pan 11 and the pan storage portion 30 during storage. In addition, a bottom coil 33 that electromagnetically heats the pan 11 is disposed at a portion of the protective frame 32 facing the bottom of the pan 11. The bottom coil 33 is a coiled heating means having a center substantially directly below the center of the bottom of the pan 11. Reference numeral 12 denotes a circuit board. A microcomputer (control means) 121 is mounted on the circuit board 12. The microcomputer 121 controls a current for generating an alternating magnetic field in the bottom coil 33. On the circuit board 12, a time measuring means 122 is mounted. Reference numeral 40 denotes a pan temperature detecting means configured to come into contact when the pan 11 is stored in the pan storage portion 30. The rice cooker of the present invention heats the pot 11 by electromagnetic induction heating and cooks the food 15 in the pot 11. The cooked food 15 is rice before cooking rice, water, cooked cooked rice, or the like.

  A general rice cooking operation will be described with reference to FIG. FIG. 2 shows a cooking program chart when normal rice cooking is performed, and the drawn waveforms are the detected temperature waveform (solid line) of the pan temperature detecting means 40, the temperature waveform of the pan 11 (one-dot chain line), and the protective frame 32. The relationship between the temperature waveform (two-dot chain line), the detected temperature waveform (dotted line) of the lid temperature detecting means, and the input power (shaded portion) to the heating means 33 and the rice cooking time is shown.

  Rice cooking is mainly referred to as the pre-cooking step A, the leveling step B, the rice cooking amount determination step C, the boiling maintenance step D, and the BD steps together. And an unevenness process E.

  In the pre-cooking process A, the control means 121 controls the bottom coil 33 to heat the pan 11 so that the temperature detected by the pan temperature detection means 40 is at a temperature point T1 (here, for example, around 40 to 60 ° C.). The pre-cooking step A is a step for sufficiently gelatinizing the center of the rice in the subsequent steps by immersing the rice in water at a temperature lower than the gelatinization temperature and allowing the rice to absorb water in advance.

  Next, the process proceeds to the cooking process. In the leveling process B and the rice cooking amount determination process C, the water in the pot 11 boils, and the temperature detected by the pot temperature detecting means 40 reaches the temperature point T2 (boiling point of water (for example, near 100 ° C.)). The pan 11 is heated by the bottom coil 33 until the lid body temperature detecting means 22 detects a predetermined temperature Tβ (for example, 80 ° C.) by the steam.

  Moreover, in the rice cooking amount determination process C, after the pan temperature detection means 40 detects a predetermined temperature Tα (for example, 80 ° C.), the rice cooking amount is calculated from the time tg required until the lid body temperature detection means 22 detects the predetermined temperature Tβ. judge.

  Next, the process proceeds to the boiling maintenance step D. The controller 121 controls the bottom coil 33 to heat the pan 11 so that the detected temperature of the pan temperature detector 40 maintains the boiling state at the temperature point T2 (boiling point of water). And if this process passes, the water in the pan 11 will evaporate, there will be no water in the pan 11, and the temperature of the pan 11 will rise. When the temperature detected by the pan temperature detecting means 40 reaches the temperature point T3 (the boiling point of water (for example, 130 ° C.) above the boiling completion temperature), it is determined that there is no water in the pan 11. Tn and Th are the maximum temperature points of the pan 11 and the protective frame 32 at this time, respectively.

  It shifts to the next unevenness process of E when the detection temperature of the pan temperature detection means 40 reaches T3. The control means 121 controls the heating means 33 to heat the pot 11 so that the temperature detected by the pot temperature detection means 40 is maintained at a temperature point T2 or higher (eg, 98 ° C.), thereby promoting the gelatinization of rice.

  Next, the rice cooking operation | movement at the time of cooking with a rice cooking course is demonstrated. FIG. 3 (a) is a cooking program chart in the case of maximum cooking in the rice cooking course in the normal use state. After detecting the cooking completion temperature T3 with no water in the pan 11 in the boiling maintenance process D, T3 The control means 121 controls the heating means 33 to heat the pan 11 until a temperature point T4 (here, for example, 160 ° C.) at a higher temperature is detected. Since the brown eyes are more easily formed as the temperature of the pan 11 becomes higher, T4 is set as high as possible within a range in which the protective frame 32 is not likely to be dissolved. The heating time at this time is ta. Moreover, the maximum temperature point Tn1 of the pan 11 is Tn1> Tn, and the pan 11 is heated (Tn1−Tn) ° C. more than when cooked normally, but the components constituting the rice cooker are melted. There is no fear of discoloration.

  Next, the rice cooking operation | movement at the time of the rice cooking course in the abnormal use state in the conventional rice cooker is demonstrated with FIG.3 (b) and FIG. FIG. 3B shows an abnormal use state that is not intended by the user, such as a foreign object entering between the pan 11 and the pan temperature detecting means 40, and the temperature of the detecting means is lower than the temperature of the pan 11. The cooking program chart at the time of cooking in the rice cooking course is shown. FIG. 4 shows that the pot temperature detecting means 40 and the pot 11 when the rice cooking is started in a state where a foreign matter 90 such as a rice grain attached to the bottom of the pot 11 enters between the pot temperature detecting means 40 and the pot 11. The positional relationship is shown. Since the pan temperature detection means 40 and the pan 11 do not normally contact each other, normal detection cannot be performed. tg1 is the time required for the amount of cooking rice. At this time, after detecting the cooking completion temperature T3 in a state where the water in the pan 11 is exhausted, the time for heating the pan 11 when the heating is continued until the temperature point T4 having a temperature higher than T3 is detected is defined as tb. To do. The time tb here is a time longer than at least ta, the maximum temperature point Tn2 of the pan 11 is Tn2> Tn1, and the pan 11 is (Tn2-Tn1) as compared with the case where the pan 11 is cooked in the normal cooking state and cooked in the rice cooking course. It will be heated excessively. Since the maximum temperature point Th2 of the protective frame 32 at this time can be a temperature at which the protective frame 32 may be dissolved, there is a possibility that the components constituting the rice cooker melt or discolor.

  Further, FIG. 5 shows a rice cooker according to the present invention in which a foreign substance enters between the pan 11 and the pan temperature detection means 40, and the user whose temperature of the detection means is lower than the temperature of the pan 11. The cooking program chart at the time of cooking in the rice cooking course in the abnormal use state which is not intended is shown. After the cooking completion temperature T3 is detected and before the second predetermined temperature T4 higher than T3 is detected, when a predetermined time tc (ta <tc <tb) has elapsed, between the pot 11 and the pot temperature detecting means 40 It is determined that the rice is being cooked in an abnormal use state where a foreign object has entered, and the process proceeds to the uneven process of the next process E. Thereby, it can avoid that the pan 11 becomes an excessively high temperature state. The maximum temperature point Tn3 of the pan 11 is Tn2> Tn3> Tn1, and the pan 11 is heated to an excess of (Tn3-Tn1) ° C. compared to the case where the pan 11 is cooked in a normal cooking state and cooked on a rice cooking course. There is no risk of melting or discoloring the parts that make up the vessel.

  As described above, according to the rice cooker of the first embodiment, foreign matter enters between the pan 11 and the pan temperature detecting means 40, and the temperature of the detecting means becomes lower than the temperature of the pan 11. In an abnormal use state not intended by the user, it is safe because the pan 11 can be prevented from becoming an excessively high temperature state and the components constituting the rice cooker can be prevented from melting or discoloring.

  It can be used not only for general households but also for business rice cookers.

Cross-sectional view of the essential parts of the rice cooker in the basic configuration of the present invention and in the first embodiment Cooking program chart at the time of cooking other than rice cooking course in normal use state in conventional rice cooker (A) Cooking program chart when cooking rice cooking course in the normal use state in the conventional rice cooker (b) Cooking program chart during cooking rice cooking course in the abnormal use state in the conventional rice cooker Positional diagram of pan temperature detection means and pan Cooking program chart when cooking rice cooking course in abnormal use state of rice cooker in Embodiment 1 of the present invention

Explanation of symbols

10 body body 11 pan 12 circuit board 121 microcomputer (control means)
122 Timekeeping means 15 Cooked food 20 Lid body 22 Lid temperature detection means 30 Pot storage part 31 Body coil base 32 Protection frame 33 Bottom coil 40 Pot temperature detection means

Claims (1)

A main body having an upper surface opened; a lid body that covers the upper surface opening of the main body so as to be openable and closable; lid temperature detection means disposed in the lid body; a pan that is detachably stored in the main body; A pot temperature detecting means for detecting temperature, a time measuring means for measuring time, a heating means for heating the food in the pot, and a control means for controlling the heating means Heating by the heating means, having a first predetermined temperature when cooking is completed, and a second predetermined temperature higher than the first predetermined temperature, and after detecting the first predetermined temperature, A rice cooker in which a cooking program is transferred to the next step when a predetermined time has elapsed before the second predetermined temperature is detected.

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