JP2006136516A - Jar type rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To delay the progress of fouling of cooked rice, and to acquire an excellent hot keeping performance by controlling a pan heating means in such a manner that the temperature of cooked rice may be kept at 60°C until the lid is opened after rice cooking. <P>SOLUTION: This jar type rice cooker is equipped with a main body 1 which keeps the upper surface open, the pan 2 which is freely detachably housed in the main body 1, the lid 3 which freely openably covers the main body 1, the pan heating means 7 which heats the pan 2, and a lid opening/closing sensing means 13 which senses the opened/closed state of the lid 3. When the lid 3 is kept closed after rice cooking, the pan heating means 7 is controlled at a first hot keeping temperature, and when the lid 3 is opened, the pan heating means 7 is controlled at a second hot keeping temperature which is higher than the first hot keeping temperature. Thus, the progress of fouling of cooked rice until the lid 3 is opened after rice cooking, and an excellent hot keeping performance can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a general household jar rice cooker.

  Conventionally, this type of jar rice cooker has a configuration as shown in FIG. 3, for example. Reference numeral 47 denotes a rice cooker main body having an open top surface, and a pot 31 for containing rice and water is detachably stored in the main body 47. Inside the main body 47, a pan heating means 33 composed of a heating coil for heating the pan 31, an inverter board 48 equipped with an inverter 32 for driving the pan heating means 33, and a side surface heating means 34 for heating the side surface of the pan 31 are arranged. It is installed. A pan sensor 38 that detects the temperature of the pan 31 is disposed at the center of the pan heating means 33. Reference numeral 49 denotes a lid that covers the upper surface opening of the rice cooker body 47 so as to be openable and closable. The lid 49 is rotatably supported by a hinge member 51 integrally formed on the upper portion of the upper frame 50 via a pin 52. A heat radiating plate 35 is fixed to the lid 49, and a lid heating means 36 for heating the lid portion and a lid sensor 37 for detecting the temperature of the heat radiating plate 35 are attached to the heat radiating plate 35 so as to be in close contact with each other. A control board 54 is disposed in the lid 49. The control board 54 is equipped with a microcomputer 55 as control means, an LCD 56 as display means, a buzzer 57 as notification means, an operation means 46 and the like. Further, a lid open / close detection means 39 comprising a float 58 and a float detector 59 is disposed in the lid 49.

  The microcomputer 55 inputs the output of the pan sensor 38 and the output of the lid sensor 37, and the amount of rice and water in the pan 31, that is, the amount of cooked rice 41 for determining the amount of rice cooked, and the amount of cooked rice determination 41 The heating output of the pan heating means 33, the side surface heating means 34, and the lid heating means 36 is determined by the output of, and the output of the pot sensor 38 and the output of the lid sensor 37 are input to control the inverter 32 based on the rice cooking sequence. The heating output of the pan heating means 33, the heating output of the side surface heating means 34 and the lid heating means 36 are controlled, and further a signal is output to the LCD 56 for displaying the state of the rice cooker and the buzzer 57 for notifying abnormalities of the rice cooker. The rice cooking control means 44 and the memory | storage means 45 which memorize | stores a rice cooking sequence are comprised. The operation means 46 outputs a signal to the microcomputer 55 for selecting a rice cooking sequence stored in the storage means 45 in the microcomputer 55 or starting rice cooking.

  The microcomputer 55 receives a signal input from the operation means 46, and based on the rice cooking and warming sequence stored in advance in the storage means 45 inside the microcomputer 55, the pan sensor 38, the lid sensor 37, and the lid opening / closing detection means 39. The heating control of the jar rice cooker is performed using the output signal from the input signal as an input signal.

  General jar rice cooker shifts to a heat insulation process that automatically heats the rice after the completion of rice cooking, but the temperature of the rice immediately after cooking is about 100 ° C, but the normal heat retention temperature of rice is normal Is around 71 ° C., and this temperature is defined as a stable temperature during heat retention. And the process in which each heating amount differs according to the temperature of rice is provided so that the temperature of rice may be optimally controlled during heat retention. In this state, assuming that the temperature of the rice and the temperature of the pan 31 are substantially the same, the temperature of the rice is controlled by the temperature detected by the pan sensor 38.

  The microcomputer 55 lowers the temperature in a short time as much as possible until the temperature detected by the pan sensor 38 reaches 71 ° C. in the heat retention process after the completion of cooking, so that the pan heating means 33, the side surface heating means 34, and the lid heating means 36. Stop energizing and stop heating. And if the detection temperature of the pan sensor 38 will be 71 degrees C or less, it will transfer to a heat insulation temperature control process so that the temperature of rice may be kept at 71 degreeC.

In the heat insulation and temperature adjustment process, when the temperature detected by the pan sensor 38 is 71 ° C. or lower, the energization to the pan heating means 33 is energized for 1 second in 16 seconds with 16 seconds as one cycle (1 second on / 16 second cycle). When the temperature detected by the pan sensor 38 reaches 71 ° C. or higher again, the energization to the pan heating means 33 is stopped and the heating is stopped, and the temperature detected by the lid sensor 37 is 72 ° C. or lower. Energizes the side heating means 34 and the lid heating means 36 at a current rate of (2 seconds on / 16 cycle) and heats again when the detected temperature of the lid sensor 37 reaches 72 ° C. or higher. The energization to the lid heating means 36 is stopped, the heating is stopped, and this operation is repeated. By this operation, the temperature of the rice can be kept at a stable temperature during the heat retention.
JP 2000-70124 A

  Conventionally, when rice is kept warm, there are problems such as drying of the rice, yellowing due to aminocarbonyl reaction involving protein and starch in the rice, and generation of off-flavor (warming odor) due to fat oxidation. Since the taste deterioration is accelerated as the temperature increases, a new problem arises that when the temperature is lowered to reduce the taste deterioration, germs floating in the air are mixed and the rice rots.

  The present invention solves the above-mentioned conventional problems, and provides a jar rice cooker with excellent heat retention performance by preventing the heating during the heat retention as much as possible and delaying the progress of the deterioration of the rice without rotting the rice. Objective.

  In order to solve the above-mentioned conventional problems, the jar rice cooker of the present invention includes a lid open / close detection means for detecting the open / close state of the lid, and a pan temperature detection means for detecting the temperature of the pot, and after the rice cooking, the lid open / close When the detecting means detects that the lid is closed, the pot heating means is controlled so that the detected temperature of the pan temperature detecting means becomes the first heat retaining temperature (for example, 60 ° C.) which is the lowest temperature at which rice does not age, When the open / close detection means detects that the lid has been opened, the pot heating means is set such that the temperature detected by the pot temperature detection means is higher than the first heat retention temperature and becomes a second heat retention temperature (for example, 72 ° C.) at which bacteria do not grow. Is controlled.

  Since 100 ° C is maintained for about 20 minutes during cooking, most bacteria are sterilized. If the lid remains closed after cooking rice, new bacteria will not enter the pan of the jar rice cooker. Therefore, even if the pan heating means is controlled to keep the temperature of the rice at 60 ° C., which is the lowest temperature at which the rice does not age, at a temperature lower than the normal temperature at the time of keeping warm, the growth of bacteria will be less rotted. Therefore, the pan heating means is controlled so that the temperature of the rice is kept at 60 ° C. until the lid is opened.

  Once the lid is opened, the bacteria floating in the air and the bacteria attached to the rice scoop when you try to cook the rice will stick to the rice in the pan, so open the lid to prevent the bacteria from breeding The pan heating means is controlled so that the temperature of the cooked rice is maintained at 72 ° C., which is a normal stable temperature during incubation and does not grow.

  Thereby, after cooking rice, it is possible to delay the progress of the deterioration of the rice by refraining from heating at the time of heat retention until the lid is opened.

  The jar rice cooker of the present invention controls the pot heating means so that the temperature of the rice is maintained at 60 ° C. until the lid is opened after cooking the rice, so that the deterioration of the rice is delayed and excellent heat retaining performance can be obtained. it can.

  1st invention is the main body with which the upper surface opened, the pan stored in the said main body so that attachment or detachment is possible, the lid | cover which covers the said main body so that opening and closing is possible, the pan heating means which heats the said pan, and the temperature of the said pan Pan temperature detecting means, control means for controlling energization to the pot heating means, timing means, and lid open / close detection means for detecting the open / closed state of the lid, the control means is the end of rice cooking Thereafter, until the lid opening / closing detection means detects that the lid has been opened, the pan heating means is controlled to maintain the temperature detected by the pot temperature detection means at the first heat retaining temperature, and the lid opening / closing detection means After detecting that the lid has been opened, the pan heating means is controlled to maintain the temperature detected by the pan temperature detecting means at a second temperature higher than the first temperature, so that the progress of rice deterioration is delayed. Excellent heat retention performance can be obtained.

  2nd invention is the main body with which the upper surface opened, the pan detachably accommodated in the said main body, the lid | cover which covers the said main body so that opening and closing is possible, the pan heating means which heats the said pan, and the temperature of the said pan Pan temperature detecting means, control means for controlling energization to the pot heating means, timing means, and lid open / close detection means for detecting the open / closed state of the lid, the control means is the end of rice cooking Thereafter, until the lid opening / closing detection means detects that the lid has been opened, the pan heating means is controlled to maintain the temperature detected by the pot temperature detection means at the first heat retaining temperature, and the lid opening / closing detection means After detecting that the lid is opened, the pan heating means is controlled to maintain the temperature detected by the pan temperature detecting means at a third temperature higher than the second temperature for a predetermined time during the temperature keeping process. Delays the progress of rice degradation even after it is opened , It is possible to obtain a not even excellent heat insulation performance that rice rot because the bacteria can be sterilized be mixed.

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

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a jar rice cooker according to the first embodiment of the present invention. In FIG. 1, 1 shows the main body of a jar rice cooker, and is equipped with the detachable pan 2 inside. Further, a lid 3 covering the upper surface of the pan 2 is rotatably supported on the hinge shaft 4 and is installed to be opened and closed. A lid opening / closing detection means 13 for detecting opening / closing of the lid 3 is constituted by a magnet 5 installed on the upper part of the lid 3 and a reed switch 6 installed at a position facing the magnet 5 on the main body 1 side. A pan heating means 7 for heating the pan 2 and a pan temperature detecting means 8 for detecting the temperature of the pan 2 are arranged inside the main body 1.

  A steam cylinder 9 for discharging the steam in the pot to the outside of the main body 1 is provided at the opening on the upper surface of the pot 2. A lid temperature detecting means 10 for detecting the temperature of the lid 3 is provided in contact with the lid 3 and controls the lid heating means 11.

  The control means 12 has a microcomputer mounted on a circuit board (not shown). The control means 12 is a rice cooking program stored in the microcomputer in advance based on an operation command input by the user via the operation panel 13 and a signal input from the pan temperature detection means 8 and the lid temperature detection means 10 by software. Thus, the heating control of the pan 2 and the lid 3 is performed. The control means 12 controls the heating amount of the pan heating means 7 and the lid heating means 11 by the energization rate (energization time per unit time) of each heating means.

  As shown in FIG. 2, for example, a plastic spherical steam valve 14 is arranged in the steam cylinder 9, so that during steaming, the steam valve 14 moves upward by the steam force, and the steam is main body. Since the steam valve 14 is positioned at the lower part of the steam cylinder 9 and closes the lower hole 15 of the steam cylinder 9 during the heat retention, the bacteria floating in the air outside the main body 1 are It becomes more difficult to enter the pot 2.

  About the jar rice cooker of Embodiment 1 of this invention comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  A user puts rice to be cooked and water corresponding to the amount of the rice into the pan 2 and decorates the main body 1. When the user operates a rice cooking start switch (not shown), the rice cooking process is performed.

  The rice cooking process is divided into pre-cooking, cooking, boiling, and steaming in chronological order. In the pre-cooking step, the pot heating means 7 is controlled so that the temperature of the pot 2 becomes a temperature suitable for water absorption of rice (50 ° C.), and the rice and water in the pot are heated. Next, in the cooking step, the pan 2 is heated with a predetermined amount of heat by the pan heating means 7 until the temperature of the pan 2 reaches a predetermined value (100 ° C.). The amount of cooked rice is determined based on the temperature rise rate at this time. In the boiling maintenance process, the pot heating means 7 and the lid heating means 11 are energized until the temperature in the pot 2 reaches a predetermined value (usually about 110 ° C.) exceeding 100 ° C. Heat. In this boiling maintenance step, the rice is held at 100 ° C. or higher for about 20 minutes, and the rice of β starch is turned into a rice that can be digested and absorbed. Finally, in the steaming step, the heating (follow-up) by the pan heating means 7 and the lid heating means 11 is performed a plurality of times during a predetermined time until the time measuring means (not shown) determines that the predetermined time has passed. (Cooking) and heating stop (pause) are repeated, and the rice cooking process is completed.

  When the rice cooking process ends, the process automatically shifts to the heat insulation process.

  In cooking rice, since the rice is kept at 100 ° C. or higher for 20 minutes, most of the bacteria are sterilized, and when the lid 3 is closed, the bacteria floating in the air outside the main body 1 are in the pot 2. Since it is difficult to enter, even if the temperature of the rice drops to 60 ° C, there is no risk of spoilage.

  Therefore, when the lid opening / closing detection means 13 is closed (in a state where it is not detected that the lid 3 is opened) after the rice cooking process is finished, the temperature detected by the pan temperature detection means 8 is set to 60 ° C. The heating amount of the pan heating means 7 and the lid heating means 11 is controlled by the energization rate of each heating means so as to keep.

  When the lid opening / closing detection means 13 detects that the lid 3 has been opened during the heat retention step, the heating amounts of the pan heating means 7 and the lid heating means 11 are set so as to keep the temperature detected by the pot temperature detection means 8 at 72 ° C. Control by the energization rate of the heating means.

  Until the lid is opened after cooking the rice, the pan heating means is controlled to 60 ° C., so that the progress of the deterioration of the rice can be delayed and excellent heat retaining performance can be obtained.

  As described above, in the present embodiment, after cooking rice, the pot heating means is controlled so as to keep the temperature of the rice at 60 ° C. until the lid is opened, so that the starch is oxidized, yellowed, and tasted by heating. It is possible to delay the progress of deterioration and to obtain excellent heat retention performance.

  Note that the pot heating means 7 may be a heater, a coil for induction heating the pot 2, or any heating means.

  In the present embodiment, the lid opening / closing detection means is composed of a magnet provided on the lid and a reed switch provided on the main body. It is good also as what comprised from the float which moves to the hinge side, and the float detection part which detects the movement of the float.

  Further, in the present embodiment, when the lid opening / closing detection means 13 detects that the lid 3 is opened, the temperature detected by the pan temperature detection means 8 is kept at 72 ° C., that is, the temperature at the time of keeping stable becomes 72 ° C. However, the temperature at the stable temperature is 60 ° C. (first temperature), and is maintained at 98 ° C. (third temperature) that can be sterilized even if bacteria are mixed for a predetermined time during the temperature maintaining process. You may make it the heat retention process controlled to do.

  As described above, the jar rice cooker according to the present invention controls the pan heating means so that the temperature of the rice is kept at 60 ° C. until the lid is opened after cooking the rice. Performance can be obtained and it is useful as a domestic jar rice cooker.

Sectional drawing of the jar rice cooker in Embodiment 1 of this invention Sectional broken sectional view of the jar rice cooker in Embodiment 1 of the present invention. Cross-sectional view of a conventional jar rice cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Pan 3 Lid 7 Pan heating means 8 Pan temperature detection means 10 Lid temperature detection means 11 Lid heating means 12 Control means 13 Lid opening / closing detection means

Claims (2)

A main body with an open top surface, a pan that is detachably stored in the main body, a lid that covers the main body so as to be opened and closed, a pan heating means that heats the pan, and a pan temperature detection that detects the temperature of the pan Means, a control means for controlling energization to the pan heating means, a timing means, and a lid open / close detection means for detecting the open / closed state of the lid, the control means detecting the lid open / close detection after the completion of rice cooking Until the means detects that the lid is opened, the pan heating means is controlled to maintain the temperature detected by the pan temperature detecting means at the first heat retaining temperature, and the lid open / close detection means detects that the lid has been opened. Is a jar rice cooker that controls the pot heating means to maintain the temperature detected by the pot temperature detecting means at a second temperature higher than the first temperature holding temperature. A main body with an open top surface, a pan that is detachably stored in the main body, a lid that covers the main body so as to be opened and closed, a pan heating means that heats the pan, and a pan temperature detection that detects the temperature of the pan Means, a control means for controlling energization to the pan heating means, a timing means, and a lid open / close detection means for detecting the open / closed state of the lid, the control means detecting the lid open / close detection after the completion of rice cooking Until the means detects that the lid is opened, the pan heating means is controlled to maintain the temperature detected by the pan temperature detecting means at the first heat retaining temperature, and the lid open / close detection means detects that the lid has been opened. Is a jar rice cooker that controls the pan heating means so as to maintain the temperature detected by the pan temperature detecting means at a third temperature higher than the second temperature keeping temperature for a predetermined time during the heat keeping step.

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