JP2007020771A - Rice cooker with warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that cooked rice cannot be heated to a favorite heat retaining temperature when a reheating function is used. <P>SOLUTION: A rice cooker with warmer has a body whose top face is opened, a lid openably covering the opening portion of the top face of the body, a pot removably stored in the body, a temperature sensing means which abuts against the pot, a heating means to heat the pot and rice to be cooked in the pot, a weight sensing means to sense the weight of the pot and the weight of the rice to be cooked in the pot, a time measuring means to sense the amount of electrical power input by the heating means, a heating control means to control the heating means, a warming function to maintain the temperature of the interior of the pot at a prescribed heat retaining temperature and a reheating function to increase the internal temperature of the pot to a level higher than the heat retaining temperature, and controls an arrival temperature after reheating by controlling the amount of input electric power by the weight of the cooked rice in the pot. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a jar rice cooker.

  Conventionally, in a jar rice cooker that automatically shifts to a heat-retaining process that maintains the temperature of the cooked rice at about 70 ° C. by the user's operation, reheating means that raises the temperature of the heat-retained cooked rice to a temperature higher than the heat-retained temperature during heat retention There is a jar rice cooker with. In the jar rice cooker having this function, there is a jar rice cooker in which the reheating time setting is changed depending on the heat retaining temperature in the pan at the time of operation (see, for example, Patent Document 1).

The jar rice cooker of the conventional example keeps the temperature while notifying the temperature state in the pan, and when the reheating switch is operated, the reheating time setting is changed according to the temperature detected by the pan temperature sensor, and the time is clearly indicated. Thereby, the reheating end time is known immediately after the operation, which is convenient.
JP-A-5-293032

  However, in the jar rice cooker of the conventional example disclosed in Patent Document 1, although the end time of the reheating operation is known, the heated rice may not rise to the temperature required by the heated rice, and the heated rice with the heat required by the user is provided. There was something I couldn't do. This is due to the fact that the total input power varies depending on the power supply voltage due to the control of heating for a predetermined time according to the heat retention temperature at the time of reheating operation, and the rise of the heat insulation rice by the amount of heat insulation rice in the pan This was because the temperature reached by the heated rice could not be controlled due to the fact that the temperature constantly fluctuated.

  The jar rice cooker of the present invention solves the above-mentioned conventional problems, and can control the total input power during the reheating operation based on the weight of the heat-insulated rice, and thus can always provide heat-insulated rice with stable heat. The purpose is to provide a jar rice cooker.

  In order to solve the above problems, a jar rice cooker according to the present invention includes a main body, a lid that covers the upper surface opening of the main body so as to be openable and closable, lid temperature detection means disposed in the lid, and detachable from the main body. A pan stored in the pan, a pan temperature detecting means abutting on the pan, a heating means for heating the pan and the food in the pan, and detecting the weight of the pan and the food in the pan. Weight detection means, timing means, input power amount detection means for detecting the amount of input power by the heating means, heating control means for controlling the heating means, and heat retention for maintaining the temperature in the pan at a predetermined heat retention temperature A function and a reheating function for raising the temperature in the pan to a temperature higher than the heat retaining temperature, and controlling the reached temperature after reheating by controlling the amount of input electric power according to the weight of the food in the pan It is characterized by.

  The jar rice cooker of the present invention controls the temperature of the heated rice during the reheating operation accurately by controlling the amount of input power by the weight of the cooked food in the pan, and always provides reheated rice with a stable temperature. Can do.

  The jar rice cooker of this invention can provide the reheated rice of the stable heat.

  1st invention, the main body with which the upper surface opened, the lid | cover which covers the upper surface opening part of the said main body so that opening and closing is possible, the pan detachably accommodated in the said main body, the pan temperature detection means contact | abutted to the said pan, The heating means for heating the pot and the food in the pot, the weight detection means for detecting the weight of the pot and the food in the pot, the time measuring means, and detecting the input electric energy by the heating means An input power amount detecting means for controlling, a heating control means for controlling the heating means, a heat retaining function for maintaining the temperature in the pan at a predetermined heat retaining temperature, and raising the temperature in the pan to a temperature higher than the heat retaining temperature. A jar rice cooker that has a reheating function and controls the temperature reached after reheating by controlling the amount of input power based on the weight of the food in the pan, and accurately controls the temperature of the heated rice during the reheating operation. And always provide reheated rice with stable temperature It can be.

  The second invention is such that, in the first invention, the user can select the reached temperature when the reheating function is used, so that the user can eat the reheated rice of his favorite heat. The convenient function of becoming can be realized.

  The third invention has a cooling means for sending outside air into the main body in the first invention, and controls the operation of the cooling means at the time of reheating by a required amount of input power, and the input required for the reheating operation. Judging the necessity of cooling of the heating control means according to the amount of electric power, and performing the reheating operation under the minimum cooling means operation, the loss of heat energy from the jar rice cooker is suppressed, and the continuous heat retention after reheating It is possible to reduce the amount of power that needs to be supplied from time to time, and to keep warm with less power consumption.

  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)
The jar rice cooker of Embodiment 1 of this invention is demonstrated using FIGS.

  FIG. 1 is a partially cutaway side view of a jar rice cooker according to an embodiment of the present invention. A sectional view is shown in the broken part. In order to simplify the drawing, lead wires and the like for electrical connection are omitted. In FIG. 1, 10 is a body (main body) of a jar rice cooker. The body 10 is provided with a lid 20 that covers the upper surface thereof so as to be freely opened and closed. The housing portion 30 of the body 10 includes an upper frame 32 and a lower coil base 31. Reference numeral 11 denotes a pan formed of a magnetic material such as stainless steel or iron. The pan 11 has a flange 12 that protrudes outward from the upper end opening, and is placed in a state in which the flange 12 is lifted from the upper end of the upper frame 32 to be detachably stored in the storage unit 30. The pan 11 has a gap between it and the storage unit 30 when stored. An induction heating coil 13 for induction heating the pan 11 is disposed at a portion of the coil base 31 that faces the bottom of the pan 11. The induction heating coil 13 includes an outer coil disposed outside the bottom surface of the coil base 31 and an inner coil disposed inside the bottom surface. Each induction heating coil is a winding having a center substantially directly below the center of the bottom of the pan 11.

  Reference numeral 14 denotes a circuit board on which a microcomputer (not shown) is mounted. The microcomputer controls the current for generating an alternating magnetic field in the induction heating coil 13 by software. The circuit board 14 is equipped with a current detection circuit that is a current detection means, a voltage detection circuit that is a voltage detection means, and a time measurement means. Below the circuit board 14, a fan motor 18 is installed as a cooling means for cooling components on the board by outside air. The jar rice cooker of Embodiment 1 induction-heats the pan 11 and heats the food 19 in the pan 11. The cooked food 19 is rice before cooking rice, water, cooked rice, or the like. During induction heating, components on the circuit board 14 generate heat when energized, the temperature rises, and there is a risk of destruction when the temperature becomes high. Therefore, the fan motor 18 is operated to perform cooling.

  Here, the configuration of the circuit board 14 will be described with reference to FIG. FIG. 2 is a circuit diagram of the jar rice cooker according to the first embodiment.

  In FIG. 2, 60 is a commercial power source, and 61 is a unidirectional power source that rectifies the commercial power source 60. 62 is an inverter circuit that converts the power source rectified by the unidirectional power source 61 into high frequency power, and the induction heating coil 13 induction heats the pan 11 with the high frequency power from the inverter circuit 62. 63 is an IGBT that is a switching element, and 64 is an induction heating circuit that drives the IGBT 63 and controls the inverter circuit. 65 is a current transformer, and 15 is a current detection circuit that converts current into voltage and outputs the voltage. The output of the current detection circuit 15 is input to the microcomputer 66 and processed. The output of the current detection circuit 15 to the microcomputer 66 is adjusted by a variable resistor 67 (hereinafter referred to as VR) 67. The voltage detection circuit 16 detects the power supply voltage, and the output of the voltage detection circuit 16 to the microcomputer 66 is adjusted by the VR 68. Reference numeral 69 denotes a crystal oscillator which is a time measuring means, and measures time in the microcomputer based on this oscillation. The microcomputer input port from the current detection circuit 15 and the microcomputer input port from the voltage detection circuit 16 are 10-bit A / D input ports.

  The output from the current detection circuit 15 to the microcomputer 66 (hereinafter referred to as the IinAD value) is adjusted so that the AD value is 250 and the AD value is 750 when the power supply current is 5A and 13A. . As a result, it can be seen from the IinAD value that the power supply current is [{(IinAD value) −250} / 500 × 8] +5] A. Similarly, the output from the voltage detection circuit 16 to the microcomputer 66 (hereinafter referred to as the VinAD value) is adjusted so that when the power supply voltage is 90V, the AD value is 250 and 110V and the AD value is 750. Shall. Thus, it can be seen that the power supply voltage is [{(VinAD value) −250} / 500 × 20] +90] V according to the VinAD value. The input power is calculated from the product of the power supply current and the power supply voltage, and the input power amount is calculated from the input power and time.

  In FIG. 1, reference numeral 21 denotes a base fixed with a gap at the bottom of the coil base 31. The base 21 is provided with a weight detection means 40 for detecting the weight of the pan 11, a pan detection means 46 for detecting the presence or absence of the pan 11, and a temperature detection means 52 for detecting the temperature of the pan 11. The configuration of each detection means will be described with reference to FIGS. FIG. 3 is an exploded perspective view of main parts of the jar rice cooker according to the first embodiment.

  The weight detection means 40 includes a load cell 41, a sensor base (insulating member) 42, and a contact tube (detecting body) 43. The load cell 41 is a robust type load transducer (weight detection element). The load cell 41 has a screw hole 411 at one end and a screw hole 412 at the other end. A thin plate 211 having a screw hole 212 is attached to the base 21. One end of the load cell 41 is screwed to the base 21 via a screw hole 212 and a screw hole 411. The other end of the load cell 41 has a gap with respect to the base 21. A resistance wire strain gauge 413 is attached to the load cell 41. A change in resistance of the strain gauge 413 when the load cell 41 is bent by a load is taken out as an electrical signal by the bridge circuit.

  Reference numeral 42 denotes a resin sensor base. The load cell 41 is fitted into the recess 421 of the sensor base 42. The sensor base 42 is screwed to one end of the load cell 41 through a screw hole 422 and a screw hole 412.

  Reference numeral 43 denotes a contact tube made of aluminum having a thickness of 2 mm. The contact tube 43 has two claw portions 431 facing the lower side. The stopper cylinder 43 is fixed to the sensor base 42 by passing the claw portion 431 through the stopper cylinder fixing hole 423 of the sensor base 42 and bending it. The contact tube 43 has a flange 432 protruding inward at the upper end. An induction heating coil 13 is disposed outside the bottom surface of the coil base 31. The contact cylinder 43 is passed through one through hole provided in the central portion of the bottom of the coil base 31 (the central portion of the induction heating coil 13 where the induction heating coil 13 is not disposed). The The upper end of the contact tube 43 is higher than the inner bottom portion of the coil base 31 (FIG. 1). The weight detection means 40 measures and supports the weight of the pan 11 only at the substantially central portion of the outer bottom thereof. Therefore, the weight detection means 40 can be attached without interfering with the induction heating coil 13. Since the pan 11 supported by the center portion of the bottom is stably disposed in the storage unit 30, the induction heating coil 13 can heat the pan 11 appropriately and stably.

  The temperature detection means 52 has two collars 521 facing the upper part, and is inserted into the contact tube 43 from the lower side. The outer diameter of the collar 521 is substantially the same as the inner diameter of the contact cylinder 43, and the temperature detection means 52 does not come out from the contact cylinder 43. Further, a spring 51 is inserted between the contact tube 43 and the temperature detection means 52. The spring 51 abuts on the lower surface of the collar 521 and the sensor base 42 and urges the temperature detection means 52 so that the temperature detection means 52 is in close contact with the pan 11. An electrical signal corresponding to the temperature of the pan 11 detected by the temperature detection means 52 is input to the circuit board 14 via the lead wire 53 and the connector 54. The lead wire 53 is pulled out from the groove 424 of the sensor base 42.

  When there is no pan 11 in the storage unit 30, the upper surface of the collar 521 of the temperature detecting means 52 is in contact with the lower surface of the flange 432 of the abutting cylinder 43. The upper surface of the temperature detecting means 52 is located higher than the upper surface of the flange 432.

  When the pan 11 is stored in the storage section 30, the bottom of the pan 11 first comes into contact with the temperature detection means 52, and finally comes into contact with the temperature detection means 52 and the contact cylinder 43 (FIG. 1). Therefore, since the batting cylinder 43 supports the pan 11 at the center, the pan 11 does not tilt. The load cell 41 detects the total weight of the pan 11, the food 19, the sensor table 42, the spring 51, the temperature detection means 52, and the contact tube 43 (the sensor table 42 to the contact tube 43 are hereinafter referred to as weight detection components). Then output. The temperature detection means 52 sinks into the contact tube 43 by the spring 51, and the upper surface thereof is in contact with the bottom of the pan 11 at the same height as the upper surface of the flange 432. The temperature detecting means 52 contacts the bottom of the pan 11 with an appropriate pressure defined by the spring 51 without applying an excessive force.

  The pan detection means 46 is composed of a micro switch fixed to the base 21 (FIG. 1). When the pan 11 is stored in the storage unit 30, the bottom of the sensor base 42 comes into contact with the microswitch, and the pan detection means 46 outputs an ON signal. The operation stroke of the micro switch is larger than the displacement amount of the sensor base 42 on which the pan 11 is placed. Thereby, even when the pan 11 is placed on the sensor base 42 and the micro switch is operated, the weight of the pan 11 supported by the micro switch is very small and does not affect the measurement value of the weight detection means 40. You may comprise so that a microswitch may not support the weight of the pan 11 more than fixed by driving a microswitch via an actuator (for example, the phosphor bronze board which has spring property).

  Electric signals from the temperature detection means 52, the pan detection means 46, and the weight detection means 40 (load cell 41) are respectively input to the circuit board 14, and signals subjected to amplification processing and the like are input to the microcomputer 66. Based on the input from the weight detection means 40, the microcomputer 66 calculates the total weight value of the pan 11, the food 19, and the weight detection component.

  In FIG. 1, reference numeral 90 denotes an operation panel which inputs a signal to a tact switch 92 provided on an operation board 91 connected to the circuit board 14 by pressing an operation key 93 made of a spherical film from the outside. . The operation unit will be described with reference to FIG. FIG. 4 is an operation unit diagram of the jar rice cooker according to the first embodiment. 94 is a rice cooking key for inputting a rice cooking start signal. A cancel key 95 is used to input a canceling signal such as rice cooking operation, heat retaining operation, reservation, and the like. 96 is a heat retention key, which inputs a heat retention operation start signal when operated when the jar rice cooker is in a non-operating state. In addition, when the jar rice cooker is operated when the heat retention state is maintained, a reheating operation start is started. A signal is input. Reference numeral 97 denotes a display unit configured so that the display on the LCD 98 on the operation board 91 can be confirmed from the transparent part of the operation panel 90. The current time, the reserved time, the current state of the jar rice cooker (reserved) Or the like).

  An example of the movement when cooking and keeping warm with the above-described jar rice cooker and measuring the amount of warm rice will be described with reference to FIG. FIG. 5 is a graph of the weight of the cooked food (rice and water or cooked rice) in the pot during the preparation of rice cooking by the jar rice cooker of Embodiment 1 and the heat, the output of the weight detection means, and the output of the temperature detection means. Here, the total weight of the weight detection components is 150 g, and the weight of the pan 11 is 1000 g.

  In the rice cooking preparation stage, first, when the user pulls out the pan from the body 10, the weight detection means output is 150 g which is the total weight of the weight detection components (a). Next, when the pan 11 containing the food 19 (rice and water) is put in the main body and the weight detection means output is 2290 g (b), the difference between the weight detection component and the total weight of the pan 11 is 1150 g. From this, it can be understood that 1140 g (c) is the weight of the food 19. Further, when the lid 20 is closed, the member on the lower surface of the lid 20 comes into contact with the pan flange 12, so that a force is applied to the pan 11, and when the output of the weight detection means is 2790 g (d), the contact force of the lid 20 is equivalent to 500 g. I can understand that there is.

  When rice cooking is started by pressing the rice cooking key 94 in the rice cooking stage, the pot 11 is induction-heated by the induction heating coil 13 according to the program in the microcomputer 66. The temperature of the cooked food 19 increased due to heat conduction from the pot 11, and the rice absorbed and expanded water, and the water evaporated by boiling, resulting in almost no excess water in the pot. Is detected by the temperature detection means 52, and after that, rice cooking is performed and the rice cooking is finished. From the weight detection means output 2570 g (e) at this time, the weight detection component weight, the pan 11 weight, and the contact force of the lid 20, the cooked rice weight can be grasped as 920 g (f).

  When cooking is finished, a heat retaining operation is started, and the pan 11 is maintained at a predetermined temperature according to a program in the microcomputer. When the user opens the lid 20 at α1, the weight detection means output is reduced by the amount of contact force of the lid 20. When the user loosens the cooked rice at α2, the weight detection means output fluctuates dramatically. Furthermore, if some rice is removed to eat at α3, the weight detection means output is reduced. Thereafter, when the user closes the lid 20, the output is stabilized after the weight detection means output increases again by the contact force of the lid 20. The microcomputer determines that the user's work is finished in this stable state. The weight of the insulated rice in the pan 11 can be grasped as 630 g (h) from the weight detection means output 1780 g (g) before the user closes the lid 20, the weight detection component weight, and the pan 11 weight. Even when the same operation is performed in β, it can be determined that the weight of the heated rice is 340 g (j) from the weight detection means output 1490 g (i) before the user closes the lid 20 by the same determination as described above.

  When the temperature is kept, the reheating operation is started by pressing the temperature keeping key 96. Here, the ultimate temperature of reheating in this jar rice cooker is 84 ° C., the specific heat of the pan 11 is 0.17 cal / g / ° C., the specific heat of the heated rice is 0.8 cal / g / ° C., and the specific heat of the pan 11 with respect to the input electric energy. The heat generation efficiency is 80%. Note that 1 Wh≈860 cal.

If the temperature of the pan 11 and the heated cooked rice is 74 ° C. and 340 g during the reheating operation, the pan 11 and the cooked cooked rice need to be raised by 10 ° C. in order to perform the heating to the ultimate temperature of 84 ° C. That is,
{((Wet 11 weight) × 0.17 + (Insulated rice weight) × 0.8) × 10} cal
= {((1000) × 0.17 + (340) × 0.8) × 10} cal
= 4420cal
The amount of heat must be heated in the pan 11. Accordingly, the microcomputer 66 is energized to the induction heating coil 13 in consideration of the heat generation efficiency until the input power amount becomes (necessary heat generation amount) / (heat generation efficiency) = 4420 cal / 0.8 = 5525 cal≈6.424 Wh, What is necessary is just to induction-heat the pot 11. In addition, when the temperature of the pan 11 exceeds 100 ° C., there is a concern that the moisture of the heat-retained cooked rice evaporates and causes drying / burning, but the heating operation is performed several times to several times while maintaining the temperature at 95 ° C. It is possible to prevent drying and scoring by any method in which the total input power amount becomes the target input power amount divided into ten times.

  As mentioned above, according to the jar rice cooker of Embodiment 1, since the input electric energy is managed while grasping | ascertaining the amount of insulated rice, even if a power supply voltage fluctuates, the ultimate temperature after reheating is large and varies. It wo n’t be done.

  In addition, when the amount of the heated rice is different, when the temperature of the pan in the reheating operation and the temperature of the heated rice is different, the temperature reached by the heated rice can be accurately controlled by appropriately correcting the above calculation. .

  In addition, numerical values such as specific heat and heat generation efficiency listed here are not limited, and change depending on the configuration and initial temperature of the jar rice cooker, so that appropriate correction is necessary.

(Embodiment 2)
The jar rice cooker of Embodiment 2 of this invention is demonstrated using FIG. FIG. 6 is an operation unit diagram of the jar rice cooker according to Embodiment 2 of the present invention. Since the configuration other than the illustrated portion is the same as the jar rice cooker (FIGS. 1 to 5) of the first embodiment, the description thereof is omitted.

  Reference numeral 99 denotes a reheating selection key, and every time the reheating selection key 99 is pressed during heat retention, the numbers 95 → 85 → 80 → 95 are repeatedly displayed on the LCD. This number represents the reheat attainment temperature, and the user can select the reheat attainment temperature by pressing the heat retention key 96 in a state where the desired temperature is displayed on the LCD.

For example, when the reheating operation is started in a state where 95 ° C. is selected as the reheating attainment temperature, if the temperature of the pan 11 and the heated rice is 74 ° C. and 340 g, the heating to the attainment temperature 95 ° C. is performed. In addition, it is necessary to raise the pan 11 and the heated cooked rice by 21 ° C. That is,
{((Wot 12 weight) × 0.17 + (Insulated rice weight) × 0.8) × 21} cal
= {((1000) × 0.17 + (340) × 0.8) × 21} cal
= 9282cal
The amount of heat must be heated in the pan 11. Therefore, the microcomputer 66 is energized to the induction heating coil 13 in consideration of the heat generation efficiency until the input power amount becomes (necessary heat generation amount) / (heat generation efficiency) = 9282 / 0.8 = 1016cal≈13.49 Wh. What is necessary is just to induction-heat the pot 11. When a different temperature is selected as the reheating arrival temperature, the arrival temperature of the heated rice can be accurately controlled with respect to the temperature selected by the user by appropriately correcting the above calculation.

  As described above, according to the jar rice cooker of Embodiment 2, the user can select the ultimate temperature when using the reheating function, which is more convenient.

  The set temperature, the display method, the operation procedure, and the like listed here are not limited.

(Embodiment 3)
The jar rice cooker of Embodiment 3 of this invention is demonstrated using FIG. FIG. 7: is a flowchart regarding cooling means operation | movement when reheating operation is performed using the jar rice cooker of Embodiment 3 of this invention. Since the structure of the jar rice cooker is the same as the jar rice cooker (FIGS. 1-5) of Embodiment 1, description is abbreviate | omitted.

  In a conventional jar rice cooker, when the pot 11 is induction-heated, components on the circuit board 14, for example, the switching element IGBT63, etc. generate heat when energized, the temperature rises, and there is a risk of destruction when the temperature becomes high. The fan motor 18 is operated to perform cooling. This is the same during the reheating operation, and the fan motor 18 is operated during the induction heating. However, since the outside air at a very low temperature relative to the heat retaining temperature is sent, the heat energy from the entire jar rice cooker is received. It will be lost. Therefore, in order to continue the heat insulation after reheating, it is necessary to supplement the electric power energy corresponding to the heat energy just cooled. On the other hand, when the energization amount is very small, the temperature rise of the components on the circuit board 14 is small, and there is a case where there is no fear of destruction even if the fan motor 18 is not cooled.

  Here, in the jar rice cooker of this invention, if the input electric energy is less than 6 Wh at the time of a reheating operation, the component on the circuit board 14 shall not be destroyed. Further, it is assumed that the required input electric energy is Q and the input electric energy is P.

  When the reheating operation is started, the necessary input electric energy Q is calculated from the temperature of the pan 11 and the heated rice, the reheat arrival temperature, and the heated rice weight. At this time, if Q <6 Wh, the fan motor 18 is not operated because there is no fear that the components on the circuit board 14 are destroyed by heat generation. On the other hand, if Q ≧ 6 Wh, the fan motor 18 is operated as usual in order to prevent the components on the circuit board 14 from being destroyed by heat generation. Then, the operation of the fan motor 18 is stopped when the difference between the required input power amount Q and the input power amount P falls below 6 Wh. In this way, the heat energy lost from the entire jar rice cooker due to the operation of the fan motor 18 can be reduced. Therefore, the amount of electric power that needs to be supplied at the time of continuous heat insulation after reheating is reduced, and overall consumption is reduced. Thermal insulation can be performed with electric energy.

  As mentioned above, according to the jar rice cooker of Embodiment 3, it can heat-retain with little electric power consumption at the time of the continuous heat retention after reheating.

  The jar rice cooker according to the present invention is useful as a jar rice cooker for home use or business use.

Side view which a part of jar rice cooker of Embodiment 1 of the present invention cut away The circuit diagram of the jar rice cooker of Embodiment 1 of this invention The principal part exploded perspective view of the jar rice cooker of Embodiment 1 of this invention Operation part figure of jar rice cooker of Embodiment 1 of the present invention Graph of the weight and weight detection means output of cooked food (rice and water or cooked rice) in the pot during the rice cooking preparation to heat insulation by the jar rice cooker of Embodiment 1 of the present invention, and the temperature detection means output Operation part figure of the jar rice cooker of Embodiment 2 of this invention The flowchart regarding the cooling means operation | movement when reheating operation is performed using the jar rice cooker of Embodiment 3 of this invention.

Explanation of symbols

10 Body (jar rice cooker body)
11 Pan 12 Flange 13 Induction Heating Coil 14 Circuit Board 15 Current Detection Circuit (Current Detection Means)
16 Voltage detection circuit (voltage detection means)
17 Timekeeping means 18 Fan motor (cooling means)
DESCRIPTION OF SYMBOLS 19 Cooking thing 20 Lid 21 Base 211 Thin plate 212 Screw hole 30 Storage part 31 Coil base 32 Upper frame 40 Weight detection means 41 Load cell 411, 412 Screw hole 413 Resistance wire strain gauge 42 Sensor stand 421 Recess 422 Screw hole 423 Hole 424 Groove 43 Catch tube 432 Flange 431 Claw 46 Pan detection means 51 Spring 52 Temperature detection means 521 Collar 53 Lead wire 54 Connector 60 Commercial power supply 61 Unidirectional power supply 62 Inverter circuit 63 IGBT
64 Induction heating circuit 65 Current transformer 66 Microcomputer 67, 68 Variable resistance (VR)
69 Quartz crystal oscillator (time measuring means)
90 operation panel 91 operation board 92 tact switch 93 operation key 94 rice cooking key 95 cancel key 96 heat retention key 97 display unit 98 LCD
99 Reheating selection key

Claims (3)

A main body having an upper surface opened; a lid that covers the upper surface opening of the main body so as to be openable / closable; a pan that is detachably stored in the main body; a temperature detecting means that contacts the pan; A heating means for heating the food, a weight detection means for detecting the weight of the pan and the food in the pan, a time measuring means, and an input power amount detection means for detecting the input power amount by the heating means A heating control means for controlling the heating means, a heat retaining function for maintaining the temperature in the pan at a predetermined heat retaining temperature, and a reheating function for raising the temperature in the pan to a temperature higher than the heat retaining temperature, A jar rice cooker in which the temperature reached after reheating is controlled by controlling the amount of input power based on the weight of the food in the pot. The jar rice cooker according to claim 1, wherein a user can select an ultimate temperature when using the reheating function. The jar rice cooker according to claim 1 or 2, comprising a cooling means for sending outside air into the main body, and controlling the operation of the cooling means at the time of reheating according to a required amount of input power.