JP2007029591A - Rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice cooker constituted so as to prevent dew formation in a heat radiating plate secured to a lid portion in an upper portion of a pot by which the usability is enhanced by effectively preventing the dew formation not only directly after cooking but also during cooking by preventing the dew formation from an early time by heating the upper portion of the pot from the early time when selecting "okayu" or rice gruel. <P>SOLUTION: The pot 1 into which rice and water is charged is heated by a heating means 2, the upper portion of the pot 1 is heated by a lid heating means 5, the temperature of the pot 1 is sensed by a lid temperature sensing means 3, and the temperature of the upper portion of the pot 1 is sensed by a lid temperature sensing means 6. The heating means 2 is driven and controlled by a control means 7 according to the content of a menu selected by a menu selecting means 4. The control means 7 carries out heating by the lid heating means 5 prior to sensing boiling by the lid temperature sensing 6 when a "okayu" course is selected, carries out heating and stopping in a predetermined time interval by the heating means 2, senses boiling by the reduction of the changing quantity of the sensed temperatures by the lid temperature sensing means 3, and thereafter reduces the fire power of the heating means 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rice cooker configured to prevent condensation on a heat sink attached to a lid at the top of a pan.

  Conventionally, this type of rice cooker has been configured as shown in FIG. 8 (see, for example, Patent Document 1). Hereinafter, the configuration will be described.

  As shown in FIG. 8, a pan heating means for removably storing a pan 13 for cooking rice by putting rice and water in a protective frame 12 stored in the rice cooker body 11 and heating the pan 13 at the bottom of the protective frame 12. 14 is provided, and a pan temperature detecting means 15 for detecting the temperature of the pan 13 by contacting the bottom surface of the pan 13 is provided. The upper part of the rice cooker body 11 is covered with a lid 16 so as to be opened and closed. A lid heating means 17 and a lid temperature detection means 18 are provided on the lid body 16, and a side surface heating means 19 is provided on the outer periphery of the protective frame 12. After the boiling is detected by the lid temperature detection means 18 during rice cooking, the lid heating means 17 and the side surface heating means 19 are simultaneously controlled.

In the above configuration, the lid temperature detecting means 18 senses the boiling of the contents of the pan 13 and controls the energization of the lid heating means 17 and the side surface heating means 19 at the same time, thereby condensing on the heat dissipation plate 20 attached to the lid body 16. Can be prevented.
JP-A-5-220043

  However, in such a conventional configuration, when lid heating by the lid heating unit 17 is performed, the lid temperature detection unit 18 is affected, and therefore boiling detection cannot be performed well. Therefore, the lid heating means 17 can be operated to prevent the heat sink 20 from condensing only after boiling is detected, and in the case of a menu for cooking using the lid temperature detecting means 17 such as porridge, the heat sink 20 There was a problem that condensation could not be prevented sufficiently.

  In addition, in the case of rice crackers, mixing may be performed during cooking, and if the lid 16 is opened during cooking, a large amount of dew will be generated due to condensation on the heat sink 20 and the area around the rice cooker will be soiled. Had the problem of being bad.

  The present invention solves the above-mentioned conventional problems, and prevents the occurrence of condensation early by heating the upper part of the pan early when selecting porridge, effectively preventing condensation not only immediately after cooking but also during cooking. It aims to prevent and improve usability.

  In order to achieve the above object, the present invention heats a pan containing rice and water by heating means, heats the upper part of the pot by lid heating means, detects the temperature of the pot by the pan temperature detecting means, and upper part of the pot. Is detected by the lid temperature detection means, an arbitrary rice cooking course is selected from the plurality of rice cooking courses by the menu selection means, and the output of the pan temperature detection means is determined by the content of the menu selected by the menu selection means by the control means The control means is configured to drive and control the heating means. When the porridge is selected by the menu selection means, the control means performs heating by the lid heating means before the boiling temperature is detected by the lid temperature detection means, and the heating means The amount of change in the temperature detected by the pan temperature detecting means can be reduced by heating and stopping at a predetermined time period. In detecting the boil, then it is obtained by the structure that reduces the heating power of the heating means.

  As a result, when the rice porridge course is selected, the top of the pan is heated early so that condensation on the heat sink attached to the lid on the top of the pan can be prevented from occurring early. Even so, dew condensation can be effectively prevented and usability can be improved.

  The rice cooker of the present invention can prevent the occurrence of condensation on the heat sink attached to the lid at the top of the pan early by heating the top of the pan early when the rice porridge course is selected, just after cooking In addition, dew condensation can be effectively prevented even during cooking, and usability can be improved.

  1st invention consists of the pan which puts rice and water, the heating means which heats the said pan, the lid heating means which heats the upper part of the said pan, the pan temperature detection means which detects the temperature of the said pan, and the said pan The lid temperature detecting means for detecting the temperature of the upper part of the menu, the menu selecting means for selecting an arbitrary rice cooking course from a plurality of rice cooking courses, and the pan temperature detecting means according to the contents of the menu selected by the menu selecting means Control means for driving and controlling the heating means in response to the output, the control means, when the porridge course is selected by the menu selection means, before the lid temperature detection means detects boiling, the lid heating means The amount of change in the temperature detected by the pan temperature detecting means is reduced by performing heating by the heating means and heating / stopping the heating by the heating means at predetermined time intervals. The boiling temperature is detected, and then the heating power of the heating means is reduced. When the porridge is selected, detection by the pan temperature detecting means is performed by heating and stopping at a predetermined time period. Since boiling can be detected by reducing the amount of temperature change, the pan upper part can be heated before condensation occurs on the heat sink attached to the lid on the upper part of the pan. The occurrence of dew condensation can be prevented from early on, and dew condensation can be effectively prevented not only immediately after cooking but also in the middle of cooking, and the usability can be improved.

  In a second aspect based on the first aspect, when the control unit selects the porridge course by the menu selection unit, the control unit performs heating by the lid heating unit before the boiling temperature is detected by the lid temperature detection unit, The temperature rise gradient from the pan temperature detecting means by heating by the means, that is, if the temperature increase rate at a predetermined time interval is equal to or less than a predetermined value, it is determined as boiling, and the heating power of the heating means is reduced. When the rice porridge course is selected, boiling can be detected when the temperature increase rate from the pan temperature detecting means is compared at a predetermined time interval by heating by the heating means, and the temperature increase rate becomes a predetermined value or less. Therefore, it is possible to heat the top of the pan before the occurrence of condensation on the heat sink attached to the lid on the top of the pan. It is possible to prevent Kukara, even while cooking not only immediately after cooking can effectively prevent condensation, it is possible to improve the usability.

  3rd invention is equipped with the 2nd temperature detection means which detects the temperature of the side of a pan in the 1st above-mentioned invention, and a control means is lid temperature detection means, when a porridge course is chosen by menu selection means The heating by the lid heating means is performed before the boiling is detected by the above, and the heating power of the heating means is reduced by detecting the boiling by the second temperature detecting means, and the porridge course is selected. When the lid temperature detecting means performs heating by the lid heating means before the boiling is detected, and the second temperature detecting means reaches the predetermined temperature, the boiling can be detected. The top of the pan can be heated before the condensation occurs on the heat sink attached to the unit, which can prevent the occurrence of condensation on the heat sink from an early stage. Even during cooking not only be able to prevent condensation effectively after, it is possible to improve the usability.

  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 is a block diagram of a rice cooker in Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the rice cooker.

  As shown in FIG. 1 and FIG. 2, the pot 1 contains rice and water. The pot 1 is heated from the bottom by the heating means 2, and the pot temperature detecting means 3 is in contact with the bottom of the pot 1. The temperature of the pan 1 is detected. The lid heating means 5 heats the lid portion at the top of the pan 1, and the lid temperature detection means 6 senses the temperature of the lid portion at the top of the pan 1. The menu selection means 4 can select an arbitrary rice cooking course from a plurality of rice cooking courses, and the control means 7 outputs the output of the pan temperature detection means 3 according to the contents of the menu selected by the menu selection means 4. The heating means 2 is driven and controlled.

  Here, the control means 7 is heated by the lid heating means 5 that heats the lid of the upper part of the pan 1 before the boiling temperature is detected by the lid temperature detection means 6 when the menu selection means 4 selects the porridge course. The boiling means is detected by reducing the amount of change in the temperature detected by the pan temperature detecting means 3 by heating / stopping the heating by the heating means 2 at a predetermined time period, and thereafter the heating power of the heating means 2 is reduced. The configuration is to let

  The operation and action of the above configuration will be described with reference to FIG. In step 21, a menu to be cooked before the start of cooking is input by the menu selection means 4, and it is determined whether the menu selected in step 22 is porridge or not. If not, it proceeds to step 23 and a cooking menu other than porridge (usually white rice etc.) ). If porridge has been selected in step 22, the process proceeds to step 24, where heating by the heating means 2 with 100% thermal power is performed. In step 25, heating by the lid heating means 5 is started 5 minutes after the start of cooking.

  In step 26, duty heating control (on for 14 seconds / 2 off for turning on the heating means 2) is performed. Thereby, when the heating means 2 is on (100% thermal power), the bottom of the pan 1 is rapidly heated, and the temperature detected by the pan temperature detecting means 3 is greatly increased, and when it is off (0% thermal power). Since the temperature in the pan 1 is lower than the bottom of the pan 1, it acts to lower the temperature detected by the pan temperature detecting means 3, and the detected temperature is lowered. By this duty heating control, when the initial water temperature is low, the difference between the rising peak temperature when the heating means 2 is on and the descending peak temperature when the heating means 2 is off is large, and this difference decreases as the water temperature rises.

  From this, in step 27, the rising peak temperature when the heating means 2 is on is detected, and in step 28, the falling peak temperature when it is off is detected. These are compared in step 29, and step 26 to step 29 are repeated until the difference is within 5 ° C. When the difference is within 5 ° C. in step 29, the water temperature in the pan 1 is sufficiently high, so it can be determined that the state is just before boiling. After determining the boiling state, the process proceeds to step 30 to make the heating power of the heating means 2 weak enough to maintain boiling (55% thermal power), and temperature adjustment control so that the temperature of the pan temperature detecting means 3 can be maintained at 93 ° C. To do.

  Steps 30 to 31 are repeated until the predetermined porridge cooking time (about 1 hour) ends in step 31. If the cooking time for rice porridge has elapsed, the process proceeds to step 32 and cooking of rice porridge is finished.

  From these steps, when the porridge course is selected, boiling can be detected by reducing the amount of change in the temperature detected by the pan temperature detection means 3 by heating and stopping at a predetermined time period. The top of the pan 1 can be heated before the occurrence of condensation on the heat sink attached to the lid on the top of the pan 1, thereby preventing the occurrence of condensation on the heat sink from an early stage.

  As described above, in the present embodiment, the control means 7 performs heating by the lid heating means 5 before the boiling temperature is detected by the lid temperature detection means 6 when the porridge course is selected by the menu selection means 4. At the same time, boiling is detected by reducing the amount of change in the temperature detected by the pan temperature detecting means 3 by heating / stopping the heating by the heating means 2 at a predetermined time period, and thereafter the heating power of the heating means 2 is reduced. Since the porridge course is selected, boiling can be detected by reducing the amount of change in the temperature detected by the pan temperature detecting means 3 by heating and stopping at a predetermined time period when the porridge course is selected. The pan top can be heated before the dew condensation occurs on the heat sink attached to the lid on the top of the pan 1. This prevents the heat dew condensation from occurring early. Rukoto can, even in the middle of cooking not only immediately after cooking it is possible to effectively prevent the condensation, it is possible to improve the usability.

(Embodiment 2)
FIG. 4 is a block diagram of the rice cooker according to Embodiment 1 of the present invention.

  As shown in FIG. 4, the control means 9 receives the output of the pan temperature detection means 3 according to the contents of the menu selected by the menu selection means 4 and controls the driving of the heating means 2. When the porridge is selected, the lid heating means 5 performs heating before the boiling is detected by the lid temperature detection means 3, and the temperature rise gradient from the pan temperature detection means 3 by heating by the heating means 2, that is, a predetermined time If the rate of temperature increase at the interval is less than or equal to a predetermined value, it is determined that the temperature is boiling, and the heating power of the heating means 2 is reduced. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation of the above configuration will be described with reference to FIG. In step 41, the menu to be cooked before the start of cooking is input by the menu selection means 4, and it is determined whether the menu selected in step 42 is porridge or not. If not, it proceeds to step 43 and a cooking menu other than porridge (usually white rice etc.) ). If porridge has been selected in step 42, the process proceeds to step 44, where heating by the heating means 2 with 100% thermal power is performed. In step 45, heating by the lid heating means 5 is started 5 minutes after the start of cooking.

  In step 46, the temperature of the pan temperature detecting means 3 is detected three times every 10 seconds. In step 47, the heating power (90% heating power) of the heating means 2 is reset. In step 48, the rate of temperature rise in the pan 1 is calculated from the temperature detected in step 46, and when it has decreased continuously three times, it is determined that it is just before boiling and the process proceeds to step 51. If the rate of temperature increase does not decrease, the process proceeds to step 49, where it is determined whether the pan temperature detecting means 3 exceeds 120 ° C. If the temperature does not exceed 120 ° C, the process returns to step 46, and steps 46 to 49 are repeated until the rate of temperature increase decreases or the pan temperature exceeds 120 ° C. When the pan bottom temperature exceeds 120 ° C., the process proceeds to Step 50, the heating of the heating means 2 is stopped for 30 seconds, and the process proceeds to Step 51. Steps 51 to 53 perform the same operations as steps 30 to 32 in FIG.

  From these steps, when the porridge course is selected, boiling can be detected by reducing the temperature rise gradient from the pan temperature detecting means 3 by heating, that is, the temperature rise rate at a predetermined time interval. Heating of the upper part of the pan 1 can be performed before the occurrence of condensation on the heat sink attached to the upper lid 1, thereby preventing the occurrence of condensation on the heat sink from an early stage.

  As described above, in the present embodiment, the control means 9 performs heating by the lid heating means 5 before the boiling temperature is detected by the lid temperature detection means 6 when the porridge course is selected by the menu selection means 4. At the same time, the temperature rise gradient from the pan temperature detecting means 3 by heating by the heating means 2, that is, the temperature rise rate at a predetermined time interval falls below a predetermined value, the boiling is determined, and the heating power of the heating means 2 is reduced. Therefore, when the rice cracker course is selected, the temperature rise rate becomes equal to or less than a predetermined value when the temperature rise gradient from the pan temperature detecting means 3 is compared at a predetermined time interval due to heating by the heating means 2. Since it can be detected, the top of the pan 1 can be heated before the dew condensation occurs on the heat sink attached to the lid of the top of the pan 1. It is possible to prevent the occurrence of dew condensation early, even during cooking not only immediately after cooking it is possible to prevent condensation effectively, it is possible to improve the usability.

(Embodiment 3)
FIG. 6 is a block diagram of a rice cooker according to Embodiment 3 of the present invention.

  As shown in FIG. 6, the 2nd temperature detection means 8 detects the temperature of the side surface of the pan 1, and is provided as shown in FIG. The control means 10 receives the output of the pan temperature detection means 3 according to the contents of the menu selected by the menu selection means 4 and controls the heating means 2 so that the rice porridge course is selected by the menu selection means 4. The lid heating means 5 is heated before the boiling is detected by the lid temperature detecting means 6, and it is determined that the second temperature detecting means 8 has reached the predetermined temperature, and the heating power of the heating means 2 is reduced. The configuration is to let Other configurations are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation of the above configuration will be described with reference to FIG. In step 61, a menu to be cooked before the start of cooking is input by the menu selection means 4, and it is determined whether the menu selected in step 62 is porridge or not. If not so, the process proceeds to step 63, and a cooking menu other than porridge (usually white rice etc.) ). If porridge has been selected in step 62, the process proceeds to step 64, where heating by the heating means 2 with 100% thermal power is performed. In step 65, heating by the lid heating means 5 is started 5 minutes after the start of cooking.

  In step 66, the heating power (90% heating power) of the heating means 2 is reset. In step 67, the temperature of the upper part of the pan 1 is detected from the second temperature detecting means 8, and it is determined whether or not the temperature detected in step 68 exceeds 85 ° C., and steps 66 to 68 are repeated until it exceeds 85 degrees. If it is determined in step 68 that the angle exceeds 85 degrees, it is determined that the inside of the pan 1 is just before boiling, and the process proceeds to step 69. Steps 69 to 71 perform the same operations as steps 30 to 32 in FIG.

  From these steps, when the porridge course is selected, heating is performed by the lid heating unit 5 before the boiling is detected by the lid temperature detection unit 6, and the second temperature detection unit 8 is reached by reaching a predetermined temperature. Since boiling can be detected, the top of the pan 1 can be heated before the dew condensation on the heat sink attached to the lid on the top of the pan 1, thereby preventing the occurrence of dew condensation on the heat sink from an early stage. can do.

  As described above, in this embodiment, when the menu selection means 4 selects the porridge course, the control means 10 performs heating by the lid heating means 5 before the lid temperature detection means 6 detects boiling. At the same time, since the heating power of the heating means 2 is reduced by detecting boiling by the second temperature detection means 8, when the porridge course is selected, before the boiling temperature is detected by the lid temperature detection means 6 Condensation occurs on the heat sink attached to the upper lid of the pan 1 because the heating by the lid heating means 5 and the second temperature detection means 8 can detect boiling when the temperature reaches a predetermined temperature. The top of the pan 1 can be heated from the front, which can prevent the occurrence of condensation on the heat sink from an early stage, not only immediately after cooking but also during cooking It is possible to prevent dew effectively, it is possible to improve the usability.

  As described above, the rice cooker according to the present invention prevents the occurrence of condensation on the heat sink attached to the lid of the upper part of the pan by heating the upper part of the pan early when the rice cracker course is selected. Since it can effectively prevent condensation not only immediately after cooking but also during cooking, it can improve the usability, so it prevents condensation on the heat sink attached to the lid on the top of the pan It is useful as a rice cooker.

The block diagram of the rice cooker in Embodiment 1 of this invention. Cross section of the rice cooker Main part operation flowchart of the rice cooker Block diagram of rice cooker in Embodiment 2 of the present invention Main part operation flowchart of the rice cooker Block diagram of rice cooker in Embodiment 3 of the present invention Main part operation flowchart of the rice cooker Cross section of conventional rice cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pan 2 Heating means 3 Pan temperature detection means 4 Menu selection means 5 Lid heating means 6 Lid temperature detection means 7 Control means

Claims (3)

A pot for putting rice and water, a heating means for heating the pot, a lid heating means for heating the upper part of the pot, a pot temperature detecting means for detecting the temperature of the pot, and detecting the temperature of the upper part of the pot The lid temperature detecting means, the menu selecting means for selecting an arbitrary rice cooking course from a plurality of rice cooking courses, and the heating means receiving the output of the pan temperature detecting means according to the contents of the menu selected by the menu selecting means Control means for driving and controlling, when the porridge course is selected by the menu selection means, the control means performs heating by the lid heating means before detecting boiling by the lid temperature detection means, Boiling can be achieved by reducing the amount of change in the temperature detected by the pan temperature detecting means by heating and stopping the heating means by a predetermined time period. And knowledge, then the cooker has a structure for reducing the heating power the heating means. The control means performs heating by the lid heating means before detecting boiling by the lid temperature detection means when the porridge course is selected by the menu selection means, and temperature rise gradient from the pan temperature detection means by heating by the heating means That is, the rice cooker according to claim 1, wherein when the rate of temperature increase at a predetermined time interval becomes equal to or less than a predetermined value, the boiling is determined and the heating power of the heating means is reduced. Second temperature detection means for detecting the temperature of the side surface of the pan is provided, and the control means performs heating by the lid heating means before the boiling is detected by the lid temperature detection means when the porridge is selected by the menu selection means. The rice cooker according to claim 1, wherein the cooker is configured to reduce the heating power of the heating means by detecting boiling with the second temperature detecting means.