JP3745192B2 - Electric rice cooker - Google Patents

Description

[0002]
BACKGROUND OF THE INVENTION
[0003]
  The present invention relates to an electric rice cooker, and more particularly to heat retention control in an electric rice cooker.
[Prior art]
[0004]
  As a conventionally known electric rice cooker, a rice cooker main body configured to be able to take out the rice cooker freely, a lid of the rice cooker main body, and a heating means for heating the rice cooker There is a normal heat-retaining set temperature Ts that is a temperature at which rice is not easily spoiled after cooking.₁(For example, approximately 72 ° C.) normal heat retention control for performing heat retention control, and normal heat retention set temperature Ts₁Lower temperature setting temperature Ts, which is lower and the temperature at which rice is less likely to deteriorate₂It has become possible to select two heat retention courses, ie, a low temperature heat retention control for performing heat retention control at (for example, 60 to 70 ° C.).
[Problems to be solved by the invention]
[0005]
  By the way, in recent years, families have not been able to eat together, and in particular, there is a problem that fathers who work for the company are not in time for meals of other families. In such a case, if you cook rice according to your family's meal time, the meal time of your father who comes home late will be kept warm as described above, and the temperature will be lower than that of freshly cooked rice. There is a problem that there is.
[0006]
  The present invention was made in view of the above points, so that even a person who is late for the meal time immediately after the completion of cooking can eat the rice in a state close to freshly cooked, as long as it is within a predetermined time. It is intended to do.
[Means for Solving the Problems]
[0007]
  In invention of Claim 1, as a means for solving the said subject, the rice cooker main body comprised so that a rice cooker could be accommodated freely, the cover body of this rice cooker main body, and the said rice cooker were heated. Heating means, normal heat control means for holding the rice cooker temperature at a normal heat set temperature, high temperature heat control means for holding the rice cooker temperature at a high temperature hold set temperature higher than the normal heat set temperature, and the rice cooker In an electric rice cooker equipped with a low temperature heat retention control means for holding the temperature at a low temperature heat retention set temperature lower than the normal heat retention set temperature, when high temperature heat retention by the high temperature heat retention control means is selected, after the end of rice cookingStart high temperature insulation control,Stop high temperature insulation control when a predetermined time has elapsedAt the same time, after the high temperature insulation control by the high temperature insulation control means is finished, it is forcibly shifted to the normal insulation control at the normal insulation setting temperature.I am doing so.
[0008]
  By configuring as above,If high temperature insulation is selected,Only after the end of cooking rice until the elapse of the predetermined time, the temperature control at the heat setting temperature higher than the normal temperature setting temperature will be performed. If so, you can eat freshly cooked rice. In addition, since the continuation time of this high temperature heat insulation control is made into predetermined time, the deterioration of the rice by high temperature heat insulation does not advance.In addition, after the high temperature insulation control is completed, the rice is forced to shift to the normal insulation control at a temperature at which the rice is not easily spoiled. It is possible to keep warm in a state that is difficult to do.
[0009]
  Claim2In the invention, as means for solving the above-mentioned problems,A rice cooker main body configured to be able to take out the rice cooker freely, a lid body of the rice cooker main body, a heating means for heating the rice cooker, and the rice cooker temperature is kept at a normal temperature setting temperature. Normal heat retention control means, high temperature heat retention control means for maintaining the rice cooker temperature at a high temperature heat retention set temperature higher than the normal heat retention set temperature, and low temperature heat retention for retaining the rice cooker temperature at a low temperature heat retention set temperature lower than the normal heat retention set temperature In the electric rice cooker provided with the control means, when the high temperature insulation by the high temperature insulation control means is selected, the high temperature insulation control is started after the completion of the rice cooking, and the high temperature insulation control is stopped when a predetermined time has elapsed. AndAfter the high temperature heat insulation control by the high temperature heat insulation control means is finished, it is forcibly shifted to the low temperature heat insulation control at the heat insulation set temperature lower than the normal heat insulation set temperature.ing.
[0010]
  By configuring as described above, when high temperature heat retention is selected, heat retention control at a heat retention set temperature higher than the normal heat retention set temperature is performed only until a predetermined time elapses after the end of rice cooking. Thus, even if a person is late for the meal time immediately after the end of cooking, it is possible to eat rice that is close to freshly cooked as long as it is within a predetermined time. In addition, since the continuation time of this high temperature heat insulation control is made into predetermined time, the deterioration of the rice by high temperature heat insulation does not advance. AlsoAfter the high temperature insulation control, the rice is forcibly transferred to the low temperature insulation control at a temperature at which the rice is not easily deteriorated. After the high temperature insulation control, the rice is not deteriorated due to the continuation of the high temperature insulation control. Long-term heat retention in a state in which deterioration is prevented can be obtained.
DETAILED DESCRIPTION OF THE INVENTION
[0011]
  Hereinafter, some preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
  First embodiment
  FIG. 1 shows an electric rice cooker according to a first embodiment of the present invention.
[0013]
  As shown in FIG. 1, this electric rice cooker is made of a synthetic resin and configured to accommodate an outer case 4 constituting an outer peripheral surface and an inner peripheral surface and a rice cooker 5 made of a magnetic material. An electromagnetic induction coil that functions as a heating means for heating the rice cooker 5 that is located on the outer peripheral side of the protective frame 6 and the rice cooker body 1 constituted by the frame 6, the lid 2 of the rice cooker body 1, and the protective frame 6. 3.
[0014]
  The outer case 4 includes a shoulder portion 4b serving as a connecting portion between a body portion 4a serving as a side peripheral surface of the rice cooker body 1 and an upper edge of the protective frame 6, and a bottom portion serving as a bottom portion of the rice cooker body 1. In the present embodiment, the body portion 4a and the shoulder portion 4b are constituted by an integrally molded product made of synthetic resin, and the bottom portion 4c is constituted separately. In some cases, the body portion 4a and the bottom portion 4c are formed of an integrally molded product made of synthetic resin, and the shoulder portion 4b is configured as a separate body.
[0015]
  The upper part on the front side of the body part 4a in the outer case 4 is gently inclined, and an operation panel part 7 is provided in the part.
[0016]
  On the bottom surface of the protective frame 6 and the back surface of the curved surface, annular electromagnetic induction coils 3 and 3 are respectively disposed. The electromagnetic induction coils 3 and 3 are positioned in a state of being sandwiched between a coil die 8 coupled to the lower surface of the central portion of the bottom surface of the protective frame 6 and extending radially along the protective frame 6 and the protective frame 6. ing. That is, the electromagnetic induction coils 3 and 3 have a shape that follows the outer peripheral surface shape of the protective frame 6. Reference numeral 9 denotes a temperature sensor that detects the temperature of the rice cooker 5 and acts as a boiling detection means and a boiling maintenance detection means, and 10 is a heat retention heater that acts as a heat source for heat retention.
[0017]
  A synthetic resin shoulder ring 11 is attached to the inner peripheral edge of the shoulder portion 4b in the outer case 4 (in other words, the mouth of the rice cooker body 1) by forcible fitting. A metal heater ring 13 having a shoulder heater 12 acting as a heat source for heat retention is attached. As will be described later, the outer periphery of the vacuum double structure 21 in the lid 2 is pressed against the upper surface of the heater ring 13 (in other words, in contact with heat conduction) when the lid 2 is closed. It has become.
[0018]
  That is, in the present embodiment, the heat retaining heater 10 and the shoulder heater 12 constitute a heat retaining heat source. In addition, you may employ | adopt the cover heater attached to the heat sink provided in the lower surface of the cover body 2 instead of the shoulder heater 12, and in that case, a heat retention heater and a cover heater comprise a heat source for heat retention. It becomes.
[0019]
  A rice cooker cooling fan 15 is disposed at the center of the rear space portion 14 formed between the back side of the outer case 4 and the back side of the protective frame 6, and the rice cooker cooling fan. The cooling air from 15 is supplied to the air passage 17 formed between the shoulder 4b and the upper end of the protective frame 6 through the duct 16, and is passed between the rice cooker 5 and the protective frame 6 through the vent hole 18. The outer peripheral surface of the rice cooker 5 is cooled by being supplied to the gap S formed therebetween. The rice cooker 5 is cooled, for example, from the completion of cooking to the transition to the target heat retention temperature or at a predetermined time determined to be necessary during the heat retention process.
[0020]
  On the other hand, the lid body 2 is pivotally supported by a rear part of the outer case shoulder 4b (that is, the opposite side of the operation panel section 7) via a hinge unit 19 so as to be openable and detachable, thereby forming an upper surface. It consists of a synthetic resin lid plate 20 and a vacuum double structure 21 forming the lower surface.
[0021]
  An opening 22 into which a pressure adjusting cap 30 (to be described later) is detachably inserted is formed at a substantially central portion of the lid plate 20, and a screw cylinder 23 having an external thread on the outer periphery at the lip of the opening 22. Are integrally attached by high frequency welding.
[0022]
  The vacuum double structure 21 is configured by forming a vacuum space 26 between two upper and lower doughnut-shaped metal plates 24 and 25 whose inner peripheral side and outer peripheral part are joined to each other. The inner peripheral side joining portion 21 a of the vacuum double structure 21 is covered with a seal member 27 and is inserted into the outer periphery of the screw cylinder 23. A vertical wall portion 25a is formed at a position from the outer periphery of the lower metal plate 25 constituting the vacuum double structure 21 to ensure strength and to be a mounting portion of a seal packing 36 to be described later.
[0023]
  The vacuum double structure 21 is attached by screwing and tightening a screw ring 28 having an internal screw to the screw cylinder 23 in a state where the screw cylinder 23 is fitted and inserted into the inner peripheral side joining portion 21a. ing. That is, the vacuum double structure 21 can be attached to and detached from the upper plate 20 by screwing the screw ring 28.
[0024]
  In addition, a pressure adjusting cylinder 29 is detachably attached in the screw cylinder 23, and an upper portion of the pressure adjusting cylinder 29 is covered by a pressure adjusting cap 30 that is detachably inserted into the opening 22. ing. Reference numeral 31 is a steam inlet to the pressure adjusting cylinder 29, 32 is a steam outlet from the pressure adjusting cylinder 29, 33 is a steam outlet in the pressure adjusting cap 30, 34 is a ball valve, and 35 is attached to the outer periphery of the pressure adjusting cylinder 29. Seal packing.
[0025]
  By the way, in the present embodiment, the vacuum double structure 21 includes an upper metal plate 24 made of a material having poor heat conductivity (for example, stainless steel, titanium, etc.) and a material having good heat conductivity (for example, aluminum or aluminum). And a lower metal plate 25 made of an alloy or the like. Therefore, as the joining means for the upper and lower metal plates 24 and 25, a brazing capable of joining different metals is adopted.
[0026]
  The outer peripheral portion of the lower metal plate 25 is a shoulder heater 12 (specifically, a heater ring) provided on the lip (that is, the outer case shoulder 4a) of the rice cooker body 1 when the lid 2 is closed. 13) to be brought into contact with each other so as to be able to conduct heat.
[0027]
  A seal packing 36 that seals the opening of the rice cooker 5 when the lid 2 is closed is attached to the vertical wall 25 a of the lower metal plate 25 by a packing ring 37.
[0028]
  In FIG. 1, the code | symbol 38 is a handle for carrying, 39 is a lock mechanism which hold | maintains the closed state of the cover body 2, and 40 is a heat insulating material.
[0029]
  By the way, as shown in FIG. 2, the operation panel unit 7 includes a rice cooking key 41, a heat retention selection key 42, a cancel key 43, a reservation key 44, a menu key 45, a reheating key 46, an hour key 47, and a minute key 48. A rice cooking indicator lamp 49, a heat retention indicator lamp 50, a reservation indicator lamp 51, and a liquid crystal display section 52 are provided.
[0030]
  Moreover, the electrical elements in the electric rice cooker having the above-described configuration are connected as shown in the block diagram of FIG. In addition, the same code | symbol is attached | subjected about the electrical element already demonstrated, and detailed description is abbreviate | omitted.
[0031]
  In FIG. 3, reference numeral 53 is a microcomputer unit (hereinafter abbreviated as a microcomputer), 54 is a commercial AC power supply, 55 is a rectifier circuit, 56 is a synchronous trigger circuit, 57 is a pulse width modulation circuit, 58 is an IGBT drive circuit, 59 Is a power feedback circuit, 60 is a power transistor, 61 is a stabilized power supply, 62 is a rectifier circuit, 63 is a step-down transformer, 64 is a triac drive power supply circuit, 65 is a triac drive circuit, 66, 67 and 68 are triacs, and 69 is rice This is a fan motor of the fan 15 for cooling the container.
[0032]
  The microcomputer 52 has a normal temperature setting temperature Ts only after a predetermined time t (for example, 3 hours) has elapsed since the end of cooking.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeIt has a function as a high temperature heat control means for performing heat control at (for example, 90 ° C.).
[0033]
  Next, the high temperature heat insulation control in the electric rice cooker having the above configuration will be described in detail with reference to the flowchart shown in FIG.
(I) High temperature insulation control (refer to the flowchart in FIG. 4)
  After the cooking of rice is finished, it is determined whether or not the high temperature heat insulation is selected by the heat insulation selection key 42 in step S1. If the determination is affirmative, “high temperature heat retention” is displayed on the liquid crystal display unit 52 as shown in FIG.
[0034]
  The rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53. In step S3, the rice cooker temperature T and the high temperature keeping temperature Ts are set._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0035]
  When it is confirmed in step S10 that the high temperature heat control has been continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11, and normal heat control or low temperature heat control described later is started by user selection. If a negative determination is made in step S1, the process proceeds directly to step S11.
[0036]
  The temporal change of the rice cooker temperature T in the above-described heat retention control is as shown in FIG. In addition, the time change of the rice cooker temperature T in the conventional normal heat retention control is as shown in FIG.
[0037]
  As described above, in the present embodiment, the normal heat retention set temperature Ts only after a predetermined time t (for example, 3 hours) has elapsed since the end of cooking.₁(For example, 72 ° C.) higher heat retention set temperature Ts_Three(For example, 90 ° C.), the heat retention control is performed, and even a person who is late for the meal time immediately after the completion of cooking can eat the rice in a state that is close to freshly cooked as long as it is within the predetermined time t. . In addition, since the continuation time of this high temperature heat retention control is set to the predetermined time t, the deterioration of the rice due to the high temperature heat retention does not proceed.
(II) Normal heat retention control (refer to the flowchart of FIG. 8)
  At this time, “normal warming” is displayed on the liquid crystal display unit 52 as shown in FIG.
[0038]
  The rice cooker temperature T detected by the temperature sensor 9 in step S1 is input to the microcomputer 53. In step S2, the rice cooker temperature T and the normal heat retention set temperature Ts.₁(For example, 72 ° C.) where T ≦ Ts₁In step S3, the work coil 3 is energized at a duty ratio = 1/16 with an output of 50%, in step S4, the heat retaining heater 10 is energized in duty ratio = 4/16, and in step S5 Shoulder heater 12 is energized with a duty ratio = 5/16, but T> Ts₁In step S6, the work coil 3 is deenergized. In step S7, the heat retaining heater 10 is energized with a duty ratio = 2/16. In step S8, the shoulder heater 12 is energized with a duty ratio = 5/16. Energized and then returns to step S1. In other words, the rice cooker temperature T is set to the normal heat retention set temperature Ts.₁The normal heat retention control to be held at is performed.
(III) Low temperature insulation control (refer to the flowchart in FIG. 9)
  At this time, “low temperature insulation” is displayed on the liquid crystal display unit 52 as shown in FIG.
[0039]
  The rice cooker temperature T detected by the temperature sensor 9 in step S1 is input to the microcomputer 53. In step S2, the rice cooker temperature T and the low temperature keeping temperature Ts are set.₂(For example, 65 ° C.) where T ≦ Ts₂In step S3, the work coil 3 is energized at a duty ratio = 1/16 with an output of 50%, in step S4, the heat retaining heater 10 is energized in duty ratio = 4/16, and in step S5 Shoulder heater 12 is energized with a duty ratio = 5/16, but T> Ts₂In step S6, the work coil 3 is deenergized. In step S7, the heat retaining heater 10 is energized with a duty ratio = 2/16. In step S8, the shoulder heater 12 is energized with a duty ratio = 5/16. Energized and then returns to step S1. In other words, the rice cooker temperature T is the normal temperature setting temperature.Ts ₁ Lower heat retention set temperatureTs₂Thus, the low temperature heat retention control is performed.
[0040]
  Second embodiment
  FIG. 10 shows a flowchart of the high temperature heat retention control in the electric rice cooker according to the second embodiment of the present invention.
[0041]
  In this case, the microcomputer 53 has a normal temperature setting temperature Ts only until a predetermined time t (for example, 3 hours) elapses after the rice cooking is finished.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeThe function as the high temperature heat control means for performing the heat control at (for example, 90 ° C.) and the normal heat set temperature Ts after the high temperature heat control by the high temperature heat control means is completed.₁It has a function as means for forcibly shifting to normal heat retention control at (for example, 72 ° C.).
[0042]
  Next, high temperature heat retention control applied to the electric rice cooker according to the present embodiment will be described with reference to the flowchart of FIG.
[0043]
  In step S1, it is determined whether or not the high temperature heat retention is selected by the heat retention selection key 42. If an affirmative determination is made here, the rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53, and in step S3, the rice cooker temperature T and the high temperature insulation set temperature Ts._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0044]
  When it is confirmed in step S10 that the high temperature heat control has been continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11, and the above-described normal heat control is forcibly transferred. When a negative determination is made in step S1, the process proceeds to step S12, and normal heat insulation control or low temperature heat insulation control is started by user selection.
[0045]
  As described above, in the present embodiment, after the high temperature heat control is finished, the rice is forced to shift to the normal heat control at a temperature (for example, 72 ° C.) at which the rice is not easily spoiled, and the high temperature heat control is continued. It is possible to perform heat insulation in a state in which it is difficult to rot after high temperature heat insulation control while preventing deterioration of the rice due to.
[0046]
  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.
[0047]
  Third embodiment
  FIG. 11 shows a flowchart of the high temperature heat retention control in the electric rice cooker according to the third embodiment of the present invention.
[0048]
  In this case, the microcomputer 53 has a normal temperature setting temperature Ts only until a predetermined time t (for example, 3 hours) elapses after the rice cooking is finished.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeA function as a high temperature heat insulation control means for performing heat insulation control at (for example, 90 ° C.) and a normal heat insulation set temperature Ts after the high temperature heat insulation control by the high temperature heat insulation control means is completed.₁Lower heat retention set temperature Ts₂And a function as a means for forcibly shifting to low temperature heat retention control at (for example, 65 ° C.).
[0049]
  Next, the high temperature heat retention control applied to the electric rice cooker according to the present embodiment will be described with reference to the flowchart of FIG.
[0050]
  In step S1, it is determined whether or not the high temperature heat retention is selected by the heat retention selection key 42. If an affirmative determination is made here, the rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53, and in step S3, the rice cooker temperature T and the high temperature insulation set temperature Ts._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0051]
  When it is confirmed in step S10 that the high temperature heat control has been continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11 and is forcibly shifted to the low temperature heat control described above. If a negative determination is made in step S1, the process proceeds to step S12, and normal heat insulation control or low temperature heat insulation control is started by user selection.
[0052]
  As described above, in the present embodiment, after the high temperature heat insulation control is finished, the rice is forcibly shifted to the low temperature heat insulation control at a temperature (for example, 65 ° C.) at which the rice is hardly deteriorated, and the high temperature heat insulation control is continued. It is possible to obtain heat insulation for a long time in a state in which the deterioration of the rice is prevented after the high temperature heat insulation control while preventing the deterioration of the rice.
[0053]
  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.
[0054]
  Fourth Embodiment (Reference Example 1)
  FIG. 12 shows a flowchart of the high temperature heat retention control in the electric rice cooker according to the fourth embodiment (Reference Example 1) of the present invention.
[0055]
  In this case, the microcomputer 53 has a normal temperature setting temperature Ts only until a predetermined time t (for example, 3 hours) elapses after the rice cooking is finished.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeIt has a function as a high temperature heat insulation control means for performing heat insulation control at (for example, 90 ° C.) and a function as a means for forcibly stopping the heat insulation control after the high temperature heat insulation control by the high temperature heat insulation control means is completed. ing.
[0056]
  Next, the high temperature heat retention control applied to the electric rice cooker according to the present embodiment will be described with reference to the flowchart of FIG.
[0057]
  In step S1, it is determined whether or not the high temperature heat retention is selected by the heat retention selection key 42. If an affirmative determination is made here, the rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53, and in step S3, the rice cooker temperature T and the high temperature insulation set temperature Ts._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0058]
  When it is confirmed in step S10 that the high temperature heat retention control has continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11, and the heat retention control is forcibly stopped (that is, all the heating means are supplied). Energization is stopped). If a negative determination is made in step S1, the process proceeds to step S12, and normal heat insulation control or low temperature heat insulation control is started by user selection.
[0059]
  As described above, in the present embodiment, the heat insulation control is forcibly stopped after the completion of the high temperature heat insulation control, and if the rice is taken out from the rice cooker 5, there is no concern about the deterioration or spoilage of the rice. . In addition, when it eats next time, if it warms with a microwave oven, it can eat deliciously.
[0060]
  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.
[0061]
  Fifth embodiment
  FIG. 13 shows a flowchart of the high temperature heat retention control in the electric rice cooker according to the fifth embodiment of the present invention.
[0062]
  In this case, the microcomputer 53 has a normal temperature setting temperature Ts only until a predetermined time t (for example, 3 hours) elapses after the rice cooking is finished.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeThe function as the high temperature heat control means for performing the heat control at (for example, 90 ° C.) and the normal heat set temperature Ts after the high temperature heat control by the high temperature heat control means is completed.₁And the function as a means for forcibly shifting to the normal heat retention control at (for example, 72 ° C.), and the rice cooker temperature T is the normal heat retention set temperature after the high temperature heat retention control by the high temperature heat retention control means is completed. Ts₁Control is performed to rapidly cool until it descends (for example, the cooling fan 15 is forcibly operated).
[0063]
  Next, high temperature heat retention control applied to the electric rice cooker according to the present embodiment will be described with reference to the flowchart of FIG.
[0064]
  In step S1, it is determined whether or not the high temperature heat retention is selected by the heat retention selection key 42. If an affirmative determination is made here, the rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53, and in step S3, the rice cooker temperature T and the high temperature insulation set temperature Ts._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0065]
  When it is confirmed in step S10 that the high temperature heat retention control has continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11, the operation of the cooling fan 15 is started, and the work coil 3 is energized in step S12. In step S13, energization to the heat retaining heater 10 is stopped, and in step S14, the shoulder heater 12 is energized with a duty ratio = 2/16. Thereafter, in step S15, the rice cooker temperature T is set to the normal heat retention set temperature Ts.₁When it is confirmed that the temperature has dropped to (for example, 72 ° C.), the operation of the cooling fan 15 is stopped in step S16, and the process is forcibly shifted to the normal heat retention control in step S17. When a negative determination is made in step S1, the process proceeds to step S18, and normal heat insulation control or low temperature heat insulation control is started by user selection.
[0066]
  As described above, in the present embodiment, after the high temperature heat control is finished, the rice is forced to shift to the normal heat control at a temperature (for example, 72 ° C.) at which the rice is not easily spoiled, and the high temperature heat control is continued. It is possible to perform heat insulation in a state in which it is difficult to rot after high temperature heat insulation control while preventing deterioration of the rice due to. Moreover, since the rice is rapidly cooled by the operation of the cooling fan 15 after the high temperature heat insulation is completed, the deterioration of the rice during the cooling process can be prevented.
[0067]
  In addition, in the case of the electric rice cooker which is not provided with the cooling fan 15, of course, you may use the fan for cooling an electronic component etc. as a means to quench rice.
[0068]
  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.
[0069]
  Sixth embodiment
  FIG. 14 shows a flowchart of the high temperature heat retention control in the electric rice cooker according to the sixth embodiment of the present invention.
[0070]
  In this case, the microcomputer 53 has a normal temperature setting temperature Ts only until a predetermined time t (for example, 3 hours) elapses after the rice cooking is finished.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeThe function as the high temperature heat control means for performing the heat control at (for example, 90 ° C.) and the normal heat set temperature Ts after the high temperature heat control by the high temperature heat control means is completed.₁(For example, 72 ° C.) lower heat retention set temperature Ts₂A function as a means for forcibly shifting to a low temperature insulation control at (for example, 65 ° C.), and after the high temperature insulation control by the high temperature insulation control means is finished, the rice cooker temperature T is a low temperature insulation preset temperature. Ts₂Control is performed to rapidly cool until it descends (for example, the cooling fan 15 is forcibly operated).
[0071]
  Next, the high temperature heat retention control applied to the electric rice cooker according to the present embodiment will be described with reference to the flowchart of FIG.
[0072]
  In step S1, it is determined whether or not the high temperature heat retention is selected by the heat retention selection key 42. If an affirmative determination is made here, the rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53, and in step S3, the rice cooker temperature T and the high temperature insulation set temperature Ts._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0073]
  When it is confirmed in step S10 that the high temperature heat retention control has continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11, the operation of the cooling fan 15 is started, and the work coil 3 is energized in step S12 Is stopped, the energization to the heat retaining heater 10 is stopped in step S13, and the shoulder heater 12 is energized with a duty ratio = 2/16 in step S14. Thereafter, in step S15, the rice cooker temperature T is set to the low temperature keeping temperature Ts.₂When it is confirmed that the temperature has dropped to, the operation of the cooling fan 15 is stopped in step S16, and the process is forcibly shifted to the low temperature keeping control in step S17. When a negative determination is made in step S1, the process proceeds to step S18, and normal heat insulation control or low temperature heat insulation control is started by user selection.
[0074]
  As described above, in the present embodiment, after the high temperature heat insulation control is finished, the rice is forcibly shifted to the low temperature heat insulation control at a temperature (for example, 65 ° C.) at which the rice is hardly deteriorated, and the high temperature heat insulation control is continued. It is possible to obtain heat insulation for a long time in a state in which the deterioration of the rice is prevented after the high temperature heat insulation control, while preventing the deterioration of the rice. Moreover, since the rice is rapidly cooled by the operation of the cooling fan 15 after the high temperature heat insulation is completed, the deterioration of the rice during the cooling process can be prevented.
[0075]
  In addition, in the case of the electric rice cooker which is not provided with the cooling fan 15, of course, you may use the fan for cooling an electronic component etc. as a means to quench rice.
[0076]
  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.
[0077]
  Seventh embodiment (reference example 2)
  FIG. 15 shows a flowchart of the high temperature heat retention control in the electric rice cooker according to the seventh embodiment (Reference Example 2) of the present invention.
[0078]
  In this case, the microcomputer 53 has a normal temperature setting temperature Ts only until a predetermined time t (for example, 3 hours) elapses after the rice cooking is finished.₁(For example, about 72 ° C.) higher heat retention set temperature Ts_ThreeIt has a function as a high temperature heat insulation control means for performing heat insulation control at (for example, 90 ° C.) and a function as a means for forcibly stopping the heat insulation control after the high temperature heat insulation control by the high temperature heat insulation control means is completed. And the rice cooker temperature T is equal to the predetermined temperature Ts after the high temperature heat control by the high temperature heat control means is completed.₀Control is performed to rapidly cool (for example, forcibly operate the cooling fan 15) until the temperature drops to (for example, 60 ° C.).
[0079]
  Next, the high temperature heat insulation control applied to the electric rice cooker according to the present embodiment will be described with reference to the flowchart of FIG.
[0080]
  In step S1, it is determined whether or not the high temperature heat retention is selected by the heat retention selection key 42. If an affirmative determination is made here, the rice cooker temperature T detected by the temperature sensor 9 in step S2 is input to the microcomputer 53, and in step S3, the rice cooker temperature T and the high temperature insulation set temperature Ts._Three(For example, 90 ° C.) where T ≦ Ts_ThreeIn step S4, the work coil 3 is energized with a 50% output at a duty ratio = 1/16, and in step S5, the heat retaining heater 10 is energized with a duty ratio = 5/16, and in step S6 Shoulder heater 12 is energized with a duty ratio = 6/16, but T> Ts_ThreeIn step S7, the work coil 3 is deenergized. In step S8, the heat retaining heater 10 is energized with a duty ratio = 3/16. In step S9, the shoulder heater 12 is energized with a duty ratio = 6/16. Energized. In other words, the rice cooker temperature T is changed to the high temperature holding temperature Ts._ThreeThus, the high temperature heat retention control to be held at is performed.
[0081]
  When it is confirmed in step S10 that the high temperature heat retention control has continued for a predetermined time t (for example, 3 hours), the process proceeds to step S11, the operation of the cooling fan 15 is started, and the work coil 3 is energized in step S12 Is stopped, the energization to the heat retaining heater 10 is stopped in step S13, and the shoulder heater 12 is energized with a duty ratio = 2/16 in step S14. In step S15, the rice cooker temperature T is a predetermined temperature Ts.₀When it is confirmed that the temperature has dropped to (eg, 60 ° C.), the operation of the cooling fan 15 is stopped in step S16, and the heat retention control is forcibly stopped in step S17 (that is, energization of all the heating means is performed). Will be stopped). When a negative determination is made in step S1, the process proceeds to step S18, and normal heat insulation control or low temperature heat insulation control is started by user selection.
[0082]
  As described above, in this embodiment, the heat insulation control is forcibly stopped after the completion of the high temperature heat insulation control, and if the rice is taken out of the rice cooker, there is no concern about the deterioration or spoilage of the rice. In addition, when it eats next time, if it warms with a microwave oven, it can eat deliciously. Moreover, since the rice is rapidly cooled by the operation of the cooling fan 15 after the high temperature heat insulation is completed, the deterioration of the rice during the cooling process can be prevented.
[0083]
  In addition, in the case of the electric rice cooker which is not provided with the cooling fan 15, of course, you may use the fan for cooling an electronic component etc. as a means to quench rice.
[0084]
  Since other configurations and operational effects are the same as those in the first embodiment, the description thereof is omitted.
[0085]
  Eighth embodiment
  FIG. 16 shows an operation panel unit in an electric rice cooker according to the eighth embodiment of the present invention. FIG. 17 shows a high-temperature heat retention control in the electric rice cooker according to the eighth embodiment of the present invention. The flowchart of is shown.
[0086]
  In this case, as shown in FIG. 16, in addition to the various keys in the first embodiment, the operation panel unit 7 includes a high temperature keeping temperature Ts._ThreeThere are provided a temperature selection key 71 for selecting, a time selection key 72 for selecting a high temperature heat retention time t for continuing the high temperature heat retention control, and a confirmation key 73. The liquid crystal display unit 52 has a high temperature keeping temperature Ts selected by the temperature selection key 71 and the time selection key 72._ThreeAnd the high temperature heat retention time t is to be displayed. In the present embodiment, the operation of the temperature selection key 71 causes the high temperature keeping temperature Ts._ThreeCan be selected and set to three types of 80 ° C, 85 ° C and 90 ° C, and the high temperature heat retention time t can be selected and set to three types of 2 hours, 3 hours and 4 hours by operating the time selection key 72. It has become. When the temperature selection key 71 and the time selection key 72 are not operated, the high temperature keeping temperature Ts._ThreeIs set to 90 ° C., and the high temperature heat retention time t is set to 3 hours set in advance.
[0087]
  Next, the high temperature insulation temperature Ts in the present embodiment._ThreeThe setting control of the high temperature heat retention time t will be described with reference to the flowchart shown in FIG.
[0088]
  In step S1, it is determined whether or not the temperature selection key 71 has been turned ON. If the determination is affirmative, in step S2, the high temperature keeping temperature Ts is determined._ThreeIt is determined whether or not is set to 80 ° C. Here, when a positive determination is made, in step S4, the high temperature insulation temperature Ts._Three80 [deg.] C. is displayed on the liquid crystal display unit 52, but if a negative determination is made, in step S3, the high temperature keeping temperature Ts_ThreeIt is determined whether or not is set to 85 ° C. Here, if a positive determination is made, in step S5, the high temperature insulation temperature Ts._Three85.degree. C. is displayed on the liquid crystal display unit 52, but if a negative determination is made, in step S6, the high temperature insulation temperature Ts._Three90 ° C. is displayed on the liquid crystal display unit 52.
[0089]
  In steps S4 to S6, each high temperature insulation temperature Ts_ThreeIs displayed, it is determined in steps S7 to S9 whether or not the temperature selection key 71 has been turned ON again. If an affirmative determination is made in steps S7 to S9, respectively, the high temperature insulation temperature Ts in steps S10 to S12._ThreeAre set to 85 ° C., 90 ° C. and 80 ° C., respectively, and in steps S13 to S15, the respective high temperature insulation temperatures Ts are set._ThreeIs displayed on the liquid crystal display unit 52. After the display, the process proceeds to step S16 and waits for the ON operation of the enter key 73 to wait for the high temperature keeping temperature Ts._ThreeThe selection setting is confirmed. If a negative determination is made in steps S7 to S9, the process directly proceeds to step S16 and waits for the ON operation of the confirmation key 73 to wait for the high temperature keeping temperature Ts._ThreeThe selection setting is confirmed.
[0090]
  If a negative determination is made in step S1 and if it is determined in step S16 that the confirmation key 73 has been turned ON, the process proceeds to step S17 to determine whether or not the time selection key 72 has been turned ON. If an affirmative determination is made here, it is determined in step S18 whether or not the high temperature heat retention time t is set to 2 hours. Here, if an affirmative determination is made, 2 hours is displayed on the liquid crystal display unit 52 as the high temperature heat retention time t in step S20. If a negative determination is made, the high temperature heat retention time t is 3 hours in step S19. A determination is made as to whether or not it has been set. Here, if an affirmative determination is made, 3 hours is displayed on the liquid crystal display unit 52 as the high temperature heat retention time t in step S21, but if a negative determination is made, the high temperature heat retention time t is 4 hours in step S22. Is displayed on the liquid crystal display unit 52.
[0091]
  When each high temperature heat retention time t is displayed in steps S20 to S21, it is determined whether or not the time selection key 72 is turned ON again in steps S23 to S25. If an affirmative determination is made in steps S23 to S25, the high temperature insulation time t is set to 3 hours, 4 hours, and 2 hours in steps S26 to S28, respectively, and the high temperature insulation time t is set to liquid crystal in steps S29 to S31. It is displayed on the display unit 52. After the display, the process proceeds to step S32, waits for the ON operation of the confirmation key 73, the selection setting of the high temperature heat retention time t is confirmed, and then the process returns to step S1. If a negative determination is made in steps S23 to S25, the process directly proceeds to step S32, and the selection setting of the high temperature heat retention time t is confirmed after the confirmation key 73 is turned on. Note that if a negative determination is made in step S17, the process returns to step S1.
[0092]
  As described above, in the present embodiment, the high temperature keeping temperature Ts._ThreeIn addition, the high temperature heat retention time t can be selected and set according to the user's preference, and can meet various user requirements. In addition, considering the deterioration of rice, etc., the high temperature insulation temperature Ts_ThreeThe maximum value of the high temperature heat retention time t needs to be determined in advance.
[0093]
  In addition, since it is the same as that in the 1st-7th embodiment mentioned above about the structure and high temperature heat retention control of an electric rice cooker, description is abbreviate | omitted.
[0094]
  In each of the above embodiments, the type in which the rice cooker is heated by electromagnetic induction using a work coil has been described. However, the present invention provides an electric heater in which an electric heating element is embedded in a hot plate made of a good heat conductor. It can also be applied to a heating source.
【The invention's effect】
[0095]
  According to invention of Claim 1, the rice cooker main body comprised so that rice cooker could be detachably accommodated, the cover body of this rice cooker main body, the heating means which heats the said rice cooker, and the said rice cooker Normal temperature control means for maintaining the temperature at a normal temperature setting temperature; high temperature temperature control means for maintaining the rice temperature at a high temperature temperature setting temperature higher than the normal temperature setting temperature; and the rice temperature at a temperature lower than the normal temperature setting temperature In an electric rice cooker equipped with a low temperature heat control means for holding at a low temperature heat set temperature, when high temperature heat insulation by the high temperature heat control means is selected, after the end of rice cookingStart high temperature insulation control,When the high temperature heat insulation control is stopped when the predetermined time has passed and the high temperature heat insulation is selected, the heat insulation set temperature that is higher than the normal heat insulation set temperature only after the predetermined time elapses after the end of cooking. In this way, even if a person is late for the meal time immediately after the end of cooking, he can eat rice that is close to freshly cooked as long as it is within the specified time. There is an effect that it can respond to the request. In addition, since the continuation time of this high temperature heat insulation control is made into predetermined time, the deterioration of the rice by high temperature heat insulation does not advance.
[0096]
  Also,After completion of the high temperature heat insulation control by the high temperature heat insulation control means, it is forcibly shifted to the normal heat insulation control at the normal heat insulation set temperature.BecauseAfter the high temperature insulation control, the rice is forcibly transferred to the normal insulation control at a temperature at which the rice is not easily spoiled. Can keep warm in difficult conditionsThere is also an effect.
[0097]
  Claim2To the invention ofAccording to the invention, the rice cooker body configured to be able to take out the rice cooker freely, the lid of the rice cooker body, the heating means for heating the rice cooker, and the rice cooker temperature are normally kept at a set temperature. A normal warming control means for maintaining the rice cooker temperature at a high temperature warming set temperature higher than the normal warming set temperature, and a holding temperature at the low temperature keeping set temperature lower than the normal warming set temperature. In the electric rice cooker equipped with the low temperature heat control means, when the high temperature heat control by the high temperature heat control means is selected, the high temperature heat control is started after the completion of the rice cooking, and the high temperature heat control is performed when a predetermined time has elapsed. When high temperature heat insulation is selected so that the control is stopped, the heat retention control is performed at a heat retention set temperature higher than the normal heat retention set temperature only until a predetermined time elapses after the completion of cooking. So If even a person who delayed meal time after meal completion within a predetermined time period, will be able to eat the rice state close to cooked, there is an effect that it corresponds to the various demands of users. In addition, since the continuation time of this high temperature heat insulation control is made into predetermined time, the deterioration of the rice by high temperature heat insulation does not advance.
[0098]
  Also,After the high temperature heat insulation control by the high temperature heat insulation control means is finished, it is forcibly shifted to the low temperature heat insulation control at the heat insulation set temperature lower than the normal heat insulation set temperature.BecauseAfter the high temperature insulation control, the rice is forced to shift to the low temperature insulation control at a temperature at which the rice is not easily deteriorated. Long-term heat retention with deterioration preventedThere is also an effect.
[Brief description of the drawings]
[0099]
FIG. 1 is a longitudinal sectional view of an electric rice cooker according to a first embodiment of the present invention.
FIG. 2 is a front view of an operation panel unit during normal heat display in the electric rice cooker according to the first embodiment of the present invention.
FIG. 3 is a block diagram showing a connection state of electrical elements in the electric rice cooker according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing the contents of high temperature heat retention control in the electric rice cooker according to the first embodiment of the present invention.
FIG. 5 is a front view of the operation panel unit at the time of high temperature heat display in the electric rice cooker according to the first embodiment of the present invention.
FIG. 6 is a time chart showing temporal changes in the rice cooker temperature during high temperature insulation in the electric rice cooker according to the first embodiment of the present invention.
FIG. 7 is a time chart showing temporal changes in rice cooker temperature during heat retention in a conventional electric rice cooker.
FIG. 8 is a flowchart showing the contents of normal heat retention control in the electric rice cooker according to the first embodiment of the present invention.
FIG. 9 is a flowchart showing the contents of low temperature heat retention control in the electric rice cooker according to the first embodiment of the present invention.
FIG. 10 is a front view of the operation panel unit at the time of low temperature heat display in the electric rice cooker according to the first embodiment of the present invention.
FIG. 11 is a flowchart showing the contents of high-temperature heat retention control in the electric rice cooker according to the second embodiment of the present invention.
FIG. 12 is a flowchart showing the contents of high-temperature heat retention control in an electric rice cooker according to a third embodiment of the present invention.
FIG. 13 is a fourth embodiment of the present invention.(Reference Example 1)It is a flowchart which shows the content of the high temperature heat retention control in the electric rice cooker concerning.
FIG. 14 is a flowchart showing the contents of high-temperature heat retention control in an electric rice cooker according to a fifth embodiment of the present invention.
FIG. 15 is a flowchart showing the contents of high-temperature heat retention control in an electric rice cooker according to a sixth embodiment of the present invention.
FIG. 16 shows a seventh embodiment of the present invention.(Reference Example 2)It is a flowchart which shows the content of the high temperature heat retention control in the electric rice cooker concerning.
FIG. 17 is a front view of an operation panel unit in an electric rice cooker according to an eighth embodiment of the present invention.
FIG. 18 is a flowchart showing the contents of selection setting control of a high temperature heat retention temperature and a high temperature heat retention time in an electric rice cooker according to an eighth embodiment of the present invention.
[Explanation of symbols]
[0100]
  1 is a rice cooker body, 2 is a lid, 3 is a heating means (work coil), 5 is a rice cooker, 9 is a temperature sensor, 15 is a cooling fan, and 53 is a microcomputer unit (microcomputer).

Claims (2)

A rice cooker main body configured to be able to take out the rice cooker freely, a lid body of the rice cooker main body, a heating means for heating the rice cooker, and the rice cooker temperature is kept at a normal temperature setting temperature. Normal heat retention control means, high temperature heat retention control means for maintaining the rice cooker temperature at a high temperature heat retention set temperature higher than the normal heat retention set temperature, and low temperature heat retention for retaining the rice cooker temperature at a low temperature heat retention set temperature lower than the normal heat retention set temperature An electric rice cooker equipped with a control means, and when the high temperature heat insulation by the high temperature heat insulation control means is selected, the high temperature heat insulation control is started after the completion of the rice cooking, and the high temperature heat insulation control is performed when a predetermined time has elapsed. The electric rice cooker is characterized in that after the high temperature heat insulation control by the high temperature heat insulation control means is finished, the operation is forcibly shifted to the normal heat insulation control at the normal heat insulation set temperature . A rice cooker main body configured to be able to take out the rice cooker freely, a lid body of the rice cooker main body, a heating means for heating the rice cooker, and the rice cooker temperature is kept at a normal temperature setting temperature. Normal heat retention control means, high temperature heat retention control means for maintaining the rice cooker temperature at a high temperature heat retention set temperature higher than the normal heat retention set temperature, and low temperature heat retention for retaining the rice cooker temperature at a low temperature heat retention set temperature lower than the normal heat retention set temperature An electric rice cooker equipped with a control means, and when the high temperature heat insulation by the high temperature heat insulation control means is selected, the high temperature heat insulation control is started after the completion of the rice cooking, and the high temperature heat insulation control is performed when a predetermined time has elapsed. stops the, you characterized in that so as to forcedly shift to a low temperature heat keeping control at low heat retention setting temperature than the conventional heat insulating set temperature after a high temperature heat keeping control is ended by the high temperature heat keeping control means collector Rice cooker.

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