JP2692540B2 - Heat cooker with lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid-added heat cooking container such as an electric rice cooker.

[0002]

2. Description of the Related Art A conventional electric rice cooker, which is one of the above-mentioned lid-added heat cooking containers, is generally constructed as shown in FIG.

That is, FIG. 12 is a vertical sectional view showing the overall construction of the electric rice cooker body. This electric rice cooker is, for example, used for both cooking and keeping warm,
The container main body includes a bottomed cylindrical outer case 1 configured so that the rice cooker 6 can be set therein, and a lid unit 7 that covers an upper portion of the outer case 1.

The outer case 1 comprises a cylindrical cover member 2 formed of a thin metal plate, and a shoulder member 4 and a bottom member 3 made of synthetic resin, which are connected to the upper and lower ends of the cover member 2, respectively. It is configured and is provided with a bottomed cylindrical inner container 5 in which the rice cooker 6 is detachably set.

At the center of the bottom surface of the inner container 5, there is provided a center sensor 28 whose upper end side temperature sensing surface 28a contacts the bottom surface of the rice cooker 6, and further the center sensor 28.
The rice cooking heater H ₁ is arranged in a spiral shape so as to be embedded in the heating plate 24 so as to surround the. In addition, inside the center sensor 28, a temperature sensitive element for detecting the temperature of the rice cooker 6 is located on the temperature sensing surface 28a side, and the rice cooker 6 is located under the temperature sensitive element. A rice cooker set sensor (consisting of a magnet and a reed switch) that detects whether or not is built in.

The lid unit 7 is formed in a hollow structure by an outer cover 8 made of synthetic resin forming the outer peripheral surface thereof and an inner cover 9 made of synthetic resin forming the inner peripheral surface. 8 and the inner cover 9 are integrally configured by joining their peripheral portions to each other with good airtightness, for example, by high frequency welding or the like. A vapor discharge port 70 is provided at a side portion of the lid unit 7 having the above structure, and a vapor discharge cylinder mounting hole 71 is formed at a lower portion of the vapor discharge port 70. A rubber-made vapor discharge cylinder mounting packing 72 is attached to the vapor discharge cylinder mounting hole 71.

Below the inner cover 9 of the lid unit 7, an inner lid 73 composed of upper and lower plate members 73a and 73b for closing the upper opening of the rice cooker 6 is provided.
The upper plate 73a is attached to the inner cover 9 with screws 74.
It is provided by mounting on the side. The central portion of the inner lid 73 composed of the upper and lower two plate members 73a and 73b is recessed upward by a predetermined depth, and the central portions of the respective recesses are connected to each other by a pin 81 and a bracket 82 to be integrated. The steam for cooking rice is introduced into the internal space 76 of the inner lid 73 through the steam introducing holes 75 formed in the peripheral wall of the recess of the lower plate member 73b. A steam discharge cylinder 78 having a pressure adjusting device 77 for releasing the steam introduced into the internal space 76 to the outside is fixed to the steam discharge cylinder mounting hole 71. The vapor discharge cylinder 78 is the packing 72 for mounting the vapor discharge cylinder.
Is attached so that it can be removed from the inner space 73 of the inner lid 73.
Are fitted through. Further, the space between the lid unit 7 and the inner lid 73 is sealed by a packing 79 attached to the peripheral portion of the inner cover 9, so that steam leaks to the outside from a portion other than the pressure regulator 77. Is being prevented.

Then, the steam at the time of boiling is once introduced into the internal space 76 in the inner lid 73 through the steam introducing hole 75 of the inner lid 73, and then from the steam introducing port 78a in the lower portion of the vapor discharge cylinder 78. Valve body 77a of pressure regulator 77, steam outlet 7
It is discharged to the outside from the upper steam discharge port 70 via 7b. Therefore, in the case of such a configuration, for example, the "oneba" that is generated during rice cooking is normally defoamed when it is introduced into the internal space 76 of the inner lid 73, and then becomes liquid, and the circumference of the lower plate member 73b is reduced. It comes to be returned to the inside of the rice cooker 6 from the return hole 80 formed at the end, so that the liquid droplet component by the "bed" is directly discharged from the pressure adjusting device 77 side to the steam discharge port 70 side. No spills occur.

[0009]

However, when the inner lid having the upper and lower double plate structure for forming the inner space is provided inside as described above, the structure of the lid unit portion is inevitably complicated. is there.

Therefore, it is conceivable to omit the inner lid of the lid unit for the purpose of simplifying the structure. And if it does so, the cost will be reduced and the maintenance will be easy.

On the other hand, however, when doing so, the liquid droplets such as "Oneba" at the time of boiling the rice directly reach the pressure adjusting device portion and are discharged to the outside from the steam discharge port through the steam discharge port. However, there is a problem that spills are likely to occur.

[0012]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above-mentioned problems, and includes a container to be heated, a case for accommodating the container to be heated, and a lid for the container to be heated. , A steam outlet provided in the lid, a first heating means for heating the heated container, a rice cooking amount determination means for determining the rice cooking amount, and a rice cooking amount determined by the rice cooking amount determination means Control the heating state of the first heating means,
In a heating and cooking container with a lid, which comprises a first heating control means for maintaining a boiling heating state within a predetermined time, a heat radiating plate constituting a lower surface part of the lid and a second heat radiating plate for heating the heat radiating plate. When the boiling heating state within a predetermined time is maintained by the heating means and the first heating control means, the droplets adhering to the heat dissipation plate are evaporated and vaporized in accordance with the amount of cooked rice determined by the amount of cooked rice determination means. Second heating control means for controlling the heating state of the second heating means is provided so that the temperature of the heat radiating plate is raised to such an extent that it can be heated.

[0013]

In the structure of the lid-added heat cooking container of the present invention, as described above, the container to be heated, the case for accommodating the container to be heated, the lid of the container to be heated, and the lid are provided. A steam outlet, a first heating means for heating the heated container, a cooked rice amount judging means for judging the cooked rice amount, and the first heating means according to the cooked rice amount judged by the cooked rice amount judging means. In a heating and cooking container with a lid, such as an electric rice cooker, which comprises a first heating control means for controlling the heating state of the above and maintaining the boiling heating state within a predetermined time, the lower surface portion of the lid is configured. A heat radiating plate and a second heating means for heating the heat radiating plate are provided, and by heating the heat radiating plate, a liquid component such as "oneba" reaching the vapor discharge port is heated and evaporated. ing. Moreover, in that case, a second heating control means for controlling the heating state of the second heating means is further provided, and the second heating control means causes the second heating control means to perform a predetermined time period by the first heating control means. When the boiling heating state in the inside is maintained, the temperature of the heat dissipation plate is increased to such an extent that the droplets adhering to the heat dissipation plate can be evaporated and vaporized according to the rice cooking amount judged by the rice cooking amount judging means. Since the heating amount of the second heating means is controlled, a suitable and efficient heat radiating plate according to the situation of droplet generation such as "oneba" which occurs corresponding to the amount of cooked rice Evaporative vaporization of droplet components such as "Oneba" by heating is performed, and spillage is effectively prevented.

[0014]

As a result of the above, according to the present invention, the inner lid of the lid unit portion can be eliminated and the spillage can be prevented. It becomes possible to provide a container for use.

[0015]

1 to 10 show an embodiment in which the present invention is applied to, for example, an electric rice cooker as an example of a lid-added heat cooking container. And among them, FIG. 1 and FIG.
Shows the configuration of the electric rice cooker main body, FIG. 3 shows the configuration of the control circuit of the electric rice cooker, FIG. 4 shows the basic rice cooking characteristics of the electric rice cooker, and FIGS. 5, 6 and 7 show The heater control contents of the electric rice cooker and FIGS. 8 to 10 show various structural examples of the steam cap portion of the electric rice cooker.

First, FIG. 1 is a longitudinal sectional view showing the overall construction of the electric rice cooker body. This electric rice cooker is used for both rice cooking and heat retention, and has a rice cooker 6 inside.
Bottomed cylindrical outer case 1 configured to be able to set
And a lid unit 7 that covers the upper part of the outer case 1.

The outer case 1 includes a cylindrical cover member 2 formed of a thin metal plate, a shoulder member 4 made of synthetic resin joined to an upper end portion of the cover member 2 and a lower end portion of the cover member 2. It is composed of a bottom member 3 which is connected to the shoulder member 4, and an inner container 5 having a bottom and having a bottom for setting the rice cooker 6 in a removable manner is provided therein. .

At the center of the bottom surface of the inner container 5, there is provided a center sensor 28 whose upper end side temperature sensing surface 28a contacts the bottom surface of the rice cooker 6 so as to surround the center sensor 28. The rice cooking heater H ₁ is arranged in a spiral shape while being embedded in the heating plate 24. In the center sensor 28, a temperature sensing element 72 located on the temperature sensing surface 28a side for detecting the temperature of the rice cooker 6 (see FIG. 3).
However, a rice cooker set sensor (consisting of a magnet and a reed switch) 71 (see FIG. 3), which is located on the lower side thereof and detects whether or not the rice cooker 6 is set, is incorporated.

The lid unit 7 is a hollow which is opened inward by an outer cover 8 made of synthetic resin constituting the outer peripheral surface thereof and an inner cover member 9 made of synthetic resin constituting the inner peripheral surface side heat dissipation plate mounting portion. The outer cover 8 and the inner cover member 9 are integrally formed by joining their peripheral portions to each other with good airtightness, for example, by high-frequency welding or the like.

The outer cover 8 is, for example, as shown in FIGS.
As shown in FIG. 3, a recess 17 is formed at the center and extends long in the left-right direction (the operation panel surface to be described later is defined as the front surface). The recess 17 has a predetermined double wall structure on the upper side thereof. The edge portion having the thickness of is folded back. The edge portion is formed on the handle portion 17a of the lid unit 7.

On the other hand, the inner cover member 9 has an opening 9a having a size substantially corresponding to the upper opening 6a of the rice cooker 6 at the center thereof.
In the opening 9a, a circular heat dissipation plate 10 made of, for example, a metal plate having a high heat conductivity such as an aluminum material is provided with a peripheral end side engaging portion 10d with the heat dissipation surface 10a facing downward. It is attached by engaging. The heat sink 10
The lid heater H ₃ consisting of a cord heater is arranged on the upper surface 10b side of the double-sided tape 10g through the double-sided tape 10g as shown in FIG. 1 and FIG. The heat from the lid heater H ₃ heats the heat dissipation plate 10 itself, and the heat of the heat dissipation plate 10 is radiated from the lower heat dissipation surface 10a to the rice cooker 6 side.

On the other hand, reference numeral 11 is a vapor discharge port formed on the rear side of the recess 17 of the outer cover 8. A steam discharge passage 12 formed by extending a part of the casing downward in a sleeve shape is connected to a lower portion of the steam discharge port 11 (on the rear surface side of the outer cover). The lower end of the vapor discharge passage 12 is opened at a position higher by a predetermined height than the position of the upper surface 10b of the radiator plate 10 on the inner cover member 9 side, and the radiator plate 10 side corresponding to the opening 12a. Has a deep trapezoidal section 10f formed on the upper side, and a steam cap fitting port 10c for mounting a steam cap described later is formed on the trapezoidal section 10f.

The steam cap fitting port 10c
On the other hand, the steam cap 14 is detachably fitted and locked from the lower side via the steam cap mounting packing 13.

As shown in FIG. 1, for example, the steam cap 14 is made of a highly water-repellent silicone resin member having a hat-shaped cross section having a tubular portion 14a on the upper side and a funnel-shaped flange portion 14b on the lower side. A plurality of ribs 14c, 14c, ... For forming gaps, which are provided with engaging pieces 15, 15, ..., Are provided on the outer peripheral surface side. A vapor outlet hole 14d is provided in the ceiling of the cylindrical body portion 14a. On the other hand, the steam cap mounting packing 13 is made of, for example, a cylindrical rubber member having elasticity, and as shown in FIG. 1, the inner and outer two members fitted into the lower end side opening 12a of the sleeve-shaped steam discharge passage 12 are connected. The first fitting portion 13a having a heavy wall structure, the engaging convex portion 13b formed inside the first fitting portion 13a, and the heat dissipation plate 1
A second fitting portion 13c fitted inside the rising opening edge portion of the 0-side steam cap fitting opening 10c, and the second fitting portion 13c.
And a lip piece 13d which is located outside of the heat radiation plate 10 and is in pressure contact with the upper surface 10a of the heat radiating plate 10, and they are integrally formed.

Therefore, as shown in FIG. 1, the steam cap mounting packing 13 is fitted and fixed to the lower end side opening 12a and the heat radiating plate 10 side opening 10c of the steam discharge passage 12 as shown in FIG. The steam cap 14 having the above structure is inserted from below into the ribs 14c, 1
4c ... the engaging pieces 15, 15 ...
The steam cap 14 is detachably fitted and fixed as shown in the drawing by press-fitting engagement on the side engagement protrusion 13b. Then, in the fitted and fixed state, the steam discharge passage 1 on the outer cover 8 side from the steam introduction passage 16 inside the steam cap 14 through the steam discharge hole 14d in the ceiling portion.
While the first communicating passage reaching 2 is formed, the rib 14 is formed.
By the gap forming action of c, 14c ... to the rice cooker 6 side from the steam discharge passage 12 on the outer cover 8 side through the gaps 18, 18 ... Between the steam cap mounting packing 13 and the heat dissipation plate 10. A second communicating passage is formed.

Therefore, in cooking rice, a large amount of steam generated after boiling passes mainly through the first communication passage through the steam discharge passage 12, and then through the steam discharge port 11 of the outer cover 8.
Although it is discharged to the outside, when spillage occurs due to condensed water that has been cooled and condensed at the time of leaving the steam outlet hole 14d of the steam cap 14 in the first communication passage or "oneba" after boiling continues. The hot water is the steam outlet 11
Second gap due to the above-mentioned gaps 18, 18 ...
It comes to be returned to the inside of the rice cooker 6 through the communication passage.

From the above circumstances, in general, droplets are likely to be generated around the steam cap 14,
In addition, if a large amount of liquid droplets are present in this portion, there is a risk that some of them will be blown out by the boiling pressure during rice cooking. Therefore, it is preferable that the liquid droplets in this portion are vaporized as quickly as possible and then discharged from the vapor discharge port 11 to the outside. In addition, it is necessary to heat the bubble-like "Oneyba" generated in the cooking process to defoam it. Therefore, in this embodiment, the upper surface 10a of the heat dissipation plate 10 is
As is clear from FIG. 2, the cover heater H ₃ has a particularly high disposition density in the vicinity of the steam cap fitting port portion 10c so that the heating temperature of the same portion is higher than that of the other portions. It is configured to improve vaporization of the liquid droplets when the above-mentioned spillage occurs. At the same time, the amount of heating is also program-controlled so that it becomes particularly high at the time of spillage such as "oneba" (described later).

Further, in the above state, a glass wool 19 having a high heat insulating property is interposed between the heat radiating plate 10 having the lid heater H ₃ and the outer cover 8, and particularly the handle portion 1
We are trying to insulate the 7a side.

The lid unit 7 configured as described above is attached to the shoulder member 4 via the hinge mechanism 20 so as to be rotatable in the left-right direction, and the open end side thereof is concerned. A lock mechanism 21 that engages with a predetermined position of the lid unit 7 and maintains the closed state of the lid unit 7 is provided.

In the lid unit 7, the packing 2 is provided on the outer periphery of the heat dissipation plate 10 below the inner cover member 9.
5 is provided, and the packing 25 seals the rice cooker 6 from the rice cooker 6 to prevent steam from leaking to the outside from a portion other than the steam cap 14 portion.

Further, a heat insulation heater H ₂ is provided on the outer surface of the side wall of the inner container 5 and is surrounded by glass wool 18. The heat-retaining heater H ₂ is mainly used to keep the cooked rice warm and prevent spoilage.

On the other hand, between the inner container 5 and the outer case 1 on the front side of the rice cooker main body, the above-mentioned rice cooking heater H ₁ ,
A microcomputer unit 23 for controlling power supply to the heat retaining heater H ₂ and the lid heater H ₃ is housed. Further, the shoulder member front side extended portion 4 on the front side of the main body
An operation panel unit 22 that constitutes an operation unit is provided in the. For example, as shown in FIG. 2, the operation panel unit 22 has three rice cooking functions of white rice cooked rice, porridge, and quick cooked rice.
Menu switch 41 for selecting (rice cooking menu)
If, rice start switch for the thermal insulation and cancel switch 42, to start cooking by the cooking heater H ₁ based on the cooking menu selected by the menu switch 41 to energize and de-energization control of the insulation heater H ₂ 43 (phage cooking), a reservation switch 44 for timer reservation, a clock adjustment switch 45, a time button 46 for the same clock, a minute button 47 for the same clock, and the menu switch 41. A liquid crystal display unit 53 is provided for displaying a rice cooking menu or the like so that the user can visually recognize the selection menu.

Next, based on the electric circuit diagram shown in FIG. 3, the structure of the electric control unit in the electric rice cooker of this embodiment will be described. In FIG. 3, parts corresponding to those shown in FIGS. 1 and 2 are designated by the same reference numerals.

In other words, the power supply voltage AC100 (V) from the commercial AC power supply 29 detects the abnormal heating state of the rice cooker 6 and fuses it through the temperature fuse 30 that melts the rice cooker H ₁ , the heat retention heater H ₂ and the lid heater H. _{In addition} to being supplied to the respective microcomputers ₃ , the voltage is stepped down by the step-down transformer 35, rectified by the rectifier 36, and supplied to the microcomputer unit 23 as its operating power supply voltage. The configuration of the microcomputer unit 23 will be described later.

The rice cooking heater H ₁ and the heat retaining heater H ₂ are connected in series with each other, and the lid heater H ₃ is connected with them in parallel with each other. A normally open contact 31a of the relay 31 is connected in series to the rice cooking heater H ₁ . The relay coil 31b of the relay 31 is turned on / off by a command signal from the microcomputer unit 23.
The excited / demagnetized state is controlled by the controlled first transistor 37. Reference numeral 32 is a diode for absorbing the counter electromotive force generated when the relay coil 31b is demagnetized.

On the other hand, triacs 33 and 34 are connected between the heat retaining heater H ₂ and the power source side ground line and between the lid heater H ₃ and the power source side ground line, respectively. Then, the gate terminals of these triacs 33, 34 are controlled by a command signal from the microcomputer unit 23 to be turned on / off by the second and third gate terminals.
ON / OFF control signals from the transistors 38 and 39 are supplied.

The microcomputer unit 23
Operates according to a clock signal from the reference frequency generation circuit (OSC) 40, and operates in accordance with a predetermined program.
-ON / OFF of the third transistors 37, 38, 39
Then, the power supply state to the rice cooking heater H ₁ , the warming heater H ₂ and the lid heater H ₃ is specifically controlled according to the basic rice cooking characteristics shown in FIG. 4, for example, as shown in the flowcharts of FIGS. 5 to 7. To do. This power supply control is performed based on an output signal from the temperature sensing element 72 incorporated in the center sensor 28. Incidentally, reference numeral 71
Is a rice cooker set sensor for detecting whether or not the rice cooker 6 is set at the start of rice cooking.

Further, the above-mentioned switches 41 to 45 of the operation panel section 22, the liquid crystal display section 53, the buzzer 73 for notifying the completion of rice cooking, etc. are respectively connected to the input / output interface section of the microcomputer unit 23. ing. The microcomputer unit 23
Constitutes the first and second heating control means in the claims.

By the way, FIG. 4 is a diagram showing ideal temperature change characteristics (basic rice cooking characteristics) of the rice cooker 6 during normal "white rice" rice cooking operation and "porridge" rice cooking operation. The rice cooking operation is roughly classified into a predetermined temperature (for example, a rice cooker temperature of 40 ° C.)
"Absorption process" in which rice absorbs water with water, "Cooking process" in which it is heated to a boiling state after the end of the absorption process, and "Boiling process" in which the boiling state is maintained for a further predetermined time.
And a "purple process" for simmering cooked rice after completion of the boiling process. The ideal heating condition of the rice cooker 6 varies depending on the amount of cooked rice, for example, by setting the length of the "boiling process" and the power supplied to the rice cooking heater H ₁ in the "boiling process" in accordance with the amount of cooked rice. You can cook rice deliciously. On the other hand, regarding the "cooking process", it has also been empirically known that rice can be cooked deliciously by causing a substantially constant temperature change regardless of the amount of cooked rice. In this embodiment, a predetermined period Δt in the middle of the “cooking process”
In, the amount of cooked rice (total number) is determined, and the heating control in the subsequent "boiling step" is performed corresponding to the determined amount of cooked rice.

In the case of the present embodiment, based on the basic rice cooking characteristics, the rice cooking heater H ₁ and the heat retention heater H ₂ are controlled to execute "white rice cooking" and "porridge rice cooking", and at the same time, as boiling over by the "Oneba" does not occur in the boiling maintain process, and to perform heating control of the effective Futahita H ₃ in the same process.

The contents of the heater control are shown in the flow charts of FIGS.

[0042] That is, when one of cooking menus "rice" or "porridge" is selected by the menu switch 41, first the temperature of the rice device 6 in Step S ₁ of FIG. 5 is a first reference temperature It is determined whether the temperature is 25 ° C. or lower (heater OFF state temperature before starting rice cooking).

As a result, if YES, the steps S ₂ ,
Proceed to S ₃ and S _4, and proceed to the above rice cooking heater H ₁ and heat retention heater H.
₂ , the lid heater H ₃ has a duty ratio of 6/14,
Heating is started by turning on and off on 8/14 and 2/14.

After the heating is started, the temperature of the rice cooker rises, and when the first reference temperature 25 ° C. is exceeded and the determination result in step S ₁ is NO, the process proceeds to step S ₅ and the same. Rice cooker temperature is the second reference temperature of 38 ℃
It is determined whether or not: As a result, if YES in the range of 28 ° C. or higher and 38 ° C. or lower, step S ₆ ,
Proceed to S ₇ and set the duty ratio of the rice cooking heater H ₁ to 2
On the other hand, the duty ratio of the upper heat retention heater H ₂ is increased to 10/14 to continue the heating state, and the temperature distribution of water in the rice cooker is made uniform.

Then, when the temperature of the rice cooker exceeds the second reference temperature of 38 ° C. (NO in step S ₅ ), the process proceeds to step S ₈ and the rice cooking heater H ₁ is turned off once and the bottom portion is heated. The heating amount from the above is reduced, and it is further determined in step S ₉ whether or not the rice cooker temperature has dropped to 41 ° C. or lower which is the third reference temperature.

[0046] As a result, when the result is YES the process proceeds to step S _10, the duty ratio of the insulation heater H ₂ 14/1
By raising the temperature to 4 (100%), the temperature of the rice cooker is maintained at 40 ° C, which is suitable for water absorption, and the water absorption step (500 seconds) is executed. On the other hand, when the rice cooker temperature for which the determination result of step S ₉ is NO exceeds the third reference temperature 41 ° C., the heat retention heater H ₂ is turned off to lower the heating amount, and the rice cooker temperature is also absorbed. The water absorption step is performed while maintaining the temperature at 40 ° C.

[0047] Then, the in each case, further determines willing lapse of a predetermined set water time 500 seconds to step S _12, becomes a YES said setting water time 500 seconds has elapsed, turn step S Proceed to ₁₃ and above rice cooker H
The duty ratio of ₁ is 14/14 and the heat insulation heater H ₂ is OF
The duty ratios of F and the lid heater H ₃ are controlled to 14/14, respectively, to heat the entire surface of the rice cooker 6 from both upper and lower sides to start the cooking process.

Next, in step S ₁₄ , it is determined whether or not the rice cooker temperature has reached a temperature exceeding a fourth reference temperature 71 ° C. for making a summation determination by executing the cooking and heating,
If YES determination is made as reaching the above temperature, the process proceeds to step S _15, the other heater H ₁ from the viewpoint in terms of leaving only the Futahita H ₃ to ensure the vaporization of the steam cap 14 parts, H ₂ is turned off, and the heating amount is temporarily reduced greatly for a predetermined set time Δt = 60 seconds required for summing judgment. Then, in step S ₁₆ , the same set time Δt = 60
Determining the course of seconds, while calculating a slip numbers in rice unit 6 from the temperature decrease after the passage of the set time Delta] t = 60 seconds, further proceeds to step S ₁₇ in FIG. 6, the cooking heater H ₁ again The duty ratio of 14/14 and the heat insulation heater H ₂ to O
Return the duty ratio of the FF and the lid heater H ₃ to 14/14 and cook up to the boiling state (up to this point, "rice cooked rice" and "rice cooked rice" are the same).

Thereafter, the process proceeds to step S ₁₈ , and it is determined whether the current rice cooking menu is the "porridge" menu or the "white rice" menu based on the operation data of the menu switch 41, and the "porridge" menu is displayed. If YES, then proceed to step S ₁₉ to determine whether or not the rice cooker temperature is at or below the fifth reference temperature of 100 ° C. (boiling temperature), while using the “white rice” menu. rice device temperature proceeds to step S ₂₀ is followed in the case of a NO is equal to or sixth reference temperature 105 ° C. below.

[0050] In the "porridge" menu, YES it judged to be when the rice reactor temperature 100 ° C. or less was in step S _19, to continue the heating state of the step S _17, rice device temperature which are determined with the other NO when exceeding the 100 ° C. the cooking amount it is determined the coupling number proceeds to step S ₃₉ to S ₄₄ in FIG. 9
Predetermined time (0 seconds, 1
After maintaining the boiling state (100 ° C.) according to the “rice porridge” with a predetermined heating amount within 30 seconds and 250 seconds), when the above respective times have elapsed, the process proceeds to step S ₄₄ and the duty of the rice cooking heater H ₁ is changed. The heating is performed in the boiling state by setting the ratio to 2/4 and the duty ratio of the heat retention heater H ₂ to 12/14 (the control thereafter is described later).

Meanwhile, in the above-mentioned "rice" menu, the above steps S ₂₀ rice device temperature is the sixth reference temperature 105 in
If it is determined to be below ℃, the same temperature is 105 ℃
While continuing the heating state of the step S ₁₇ until a state exceeding, when it is determined as NO reaches the boiling maintained temperature 110 ° C. of rice menu which the rice device temperature is the reference beyond ° C. the temperature of 105, after starting the counting operation of the elapsed time determining timer for Futahita control duty determination, which will be described later, from said time point, rice amount based on the focus speed calculation value the routine proceeds to step S _21, S ₂₂ (minor, intermediate amount, a large amount ), And the determined amount of cooked rice, “small amount, medium amount, large amount”
Boiled state according to "white rice" rice by setting the heating amounts of the rice cooker H ₁ and the heat retention heater H ₂ according to
Maintain (110 ° C.) (see FIG. 4).

Then, after that, steps S ₂₆ , S ₂₇ , S ₂₈
After sequentially judging the elapse of the boiling maintenance time of 180 seconds, 360 seconds, and 660 seconds from the count value of the elapsed time determination timer, the following steps S ₂₉ , S ₃₀ , S ₃₁ , and S ₃₂ correspond to the respective elapsed times. Then, the duty ratio of the lid heater H ₃ is changed from full power 14/14 to 12 after the first 180 seconds has elapsed.
/ 14, 9/14, 7/14 and so on, the heat radiating plate 10 is heated by gradually decreasing the setting as time passes,
The lower surface of the heat sink 10 and the steam cap 14
When the "oneba" comes into contact with and invades the part, the temperature of the heat sink 10 is controlled to be sufficiently high,
The bubble-shaped "Oneba" is defoamed by heating, and the droplets (liquid component) after defoaming are effectively evaporated and vaporized.

In the above case, the reason why the duty ratio of the lid heater H ₃ is set to be larger at the beginning of boiling when the elapsed time of the boiling maintaining time is shorter and smaller at the beginning of boiling is as follows. by.

That is, in the cooking process, the bubble-like "bed" generated by maintaining boiling for a predetermined time lowers the temperature of the steam cap 14 by touching the heat radiating plate 10. And the temperature of the part is 10
When the temperature falls to 0 ° C. or lower, the “nemba” in the bubble state is liquefied to be a so-called “nemba” state, but when the state occurs in the steam cap 14, spillage is particularly likely to occur.
However, if the temperature of the heat dissipation plate 10 is set sufficiently high before the "nemba" in the bubble state comes into contact with the heat dissipation plate 10, thereafter, the preheating and the rise of the rice cooker temperature may occur. Since the temperature of the heat sink 10 can be maintained sufficiently high due to the synergistic effect, the heating amount can be relatively small. Further, by doing so, the life of the lid heater H ₃ can be lengthened, leading to energy saving. Therefore, at the initial stage of boiling start (180 seconds), full power (14
/ 14) quickly raises the temperature and reaches a certain temperature,
After that, the power is gradually reduced.

Further, according to this control, it is not necessary to separately provide a temperature sensor on the heat dissipation plate portion.

Next, as a result of performing the cooking and heating as described above and controlling the heating of the lid heater H ₃ , whether or not the temperature of the rice cooker 6 has reached 130 ° C. is continued in step S.
_When it is judged in ₃₃ and the water content has decreased and the rice cooker temperature has reached 130 ° C, proceed to the "Murashi process", and set the preset time.
Within (12 minutes), "purple" is performed while maintaining a predetermined temperature (eighth reference temperature 110 ° C). The "steaming" during at step S ₃₄ until the lapse of the predetermined set time 12 minutes are determined,
Step determines the upper and lower change in S ₃₅ from the eighth reference temperature 110 ° C., the step S ₃₇ in accordance with the determination result, or cooking heater H ₁ in S _16, insulation heater H _2, Futahita H
_By changing the ON / OFF state of ₃ and the duty ratio at ON as shown in the figure, the rice cooker temperature can be set to the above 11
This is done by maintaining at 0 ° C.

[0057] When the final course of the set time of 12 minutes at step S ₃₄ is determined, and ends all the control performed buzzer informing of rice completed in step S _38.

Meanwhile, if the step S ₁₉ of FIG. 6 proceeds to step S ₃₉ to S ₄₄ of FIG. 7 "porridge" rice, as follows.

That is, when the heating in step S ₄₄ is started as described above, the lid heater H ₃ similar to that in the case of "rice cooked rice" is controlled to be ON in steps S ₄₅ , S ₄₇ and S _49. The boiling maintenance times of 180 seconds, 360 seconds, and 660 seconds are sequentially determined. Then, the following steps S ₄₆ , S ₄₈ ,
The duty ratio of the lid heater H ₃ is set to the first full power state 14 at each elapsed time determined in S ₅₀ and S _51.
/ 14 to 12/14, 9/14, 7/14 are set to be gradually smaller and the heat sink 10 is heated, and the bubble-like "oneba" is on the bottom surface of the heat sink 10 as in the case of the above "white rice" rice cooking. Boil-out is prevented by heating and defoaming at the stage of touch and effectively vaporizing the droplets that have entered the steam cap 14.

In this case, the duty ratio of the lid heater H ₃ is increased as the time after maintaining the boiling is shorter, and is decreased as the time is increased as compared with the case of the "white rice" menu. It is for the same reason.

Next, whether or not the above-mentioned cooking heating and heating control of the lid heater H _{3 have} exceeded a predetermined set time of 2000 seconds set in correspondence with the rice cooking characteristics of "porridge" (see FIG. 4). determined in step S ₅₂ that follows, when a YES to the time 2000 seconds has elapsed, then the process proceeds to "steaming process", predetermined set time corresponding to the "porridge" (7 minutes) within a predetermined temperature "Murashi" is performed while maintaining at 100 ° C. The "Murashi"
Until the predetermined set time of 7 minutes is determined in step S ₅₃ , the rice cooking heater H ₁ is turned off, the heat retention heater H ₂ is turned off, and the duty ratio of the lid heater H ₃ is set to 2/14. And the rice cooker temperature is 100 ℃ above
Made by maintaining.

[0062] Then, finally after the heaters H _1, H _2, H ₃ to OFF in step S ₅₅ when the lapse of the set time of 7 minutes is determined in step S _53, rice completed in step S ₃₈ The buzzer is notified and the whole control is terminated.

As the structure of the steam cap 14 in the above-described embodiment, the structure shown in FIGS. 8 to 10 can be adopted in addition to the structure shown in FIG.

First, the structure shown in FIG. 8 has the same basic structure as that of the structure shown in FIG. 1, except that the steam outlet 14d is located at the ceiling and is not opened in the vertical direction. 14a, which is located on the peripheral wall of the upper end side and is opened to the side, and two ribs 14 are provided only at the opening of the steam outlet hole 14d.
It is characterized in that a gap defined by c and 14c is formed to correspond to the same second communication passage as described above.

With such a structure, the "nemba", which rises from below as a barrier against the ceiling, once collides with the ceiling and is then led out to the side. It will not be blown out in 11 directions. In addition, since there is a second communication passage for return due to the gap 18 between the ribs 14c, 14c in the lead-out portion, the liquid component of the “Oneyba” that is led out passes through the second communication passage. It is effectively returned to the inside of the rice cooker 6 through.

Therefore, spillage is less likely to occur.

Next, in the case of FIG. 9, a plurality of steam outlet holes 14d are formed in the radial direction, which are open to the side like the above-mentioned FIG.
In accordance therewith, a plurality of second communication passages formed by the inter-rib gaps 18 are also formed in the radial direction, and the steam outlet holes 14 are formed.
It is characterized in that a part of the ceiling portion corresponding to the opening of d is cut out to facilitate the discharge of the steam component toward the upper steam discharge port 11.

With this structure, the steam outlet 14
The passage length due to the plate thickness to the side of part d disappears, and there is essentially only the opening surface.

Therefore, in addition to the effect of preventing the "bedlock" from blowing out due to the barrier action of the ceiling portion similar to that of FIG. 8 described above, an efficient upward vapor discharging effect similar to that of FIG. 1 can be realized.

Further, in FIG. 10, the funnel-shaped flange portion 14 under the steam cap 14 having the structure shown in FIG. 8 is used.
A tubular portion 14e is further formed on the lower end side of the b, and a bottomed tubular tray portion 14f is detachably fitted to the tubular portion 14e. Then, the steam introducing holes 14g, 14h, 1 are provided at the center of the bottom of the tray 14f and at a plurality of parts on the side.
It is characterized by forming 4h ...

With this structure, it becomes difficult for the "oneba" itself to enter the steam cap 14, and in addition, after the "oneba" inside has stayed on the saucer part 14f, the bottom part It comes to be returned downward through the central steam introduction hole 14g.

Therefore, the effect of preventing spillage is improved more than the steam cap having the structure shown in FIG.

Further, in the above-described embodiment, the case where the present invention is applied to the heater heating type electric rice cooker has been described, but the lid unit 7 in which the inner lid similar to the above-mentioned embodiment is omitted and the heat dissipation plate is provided. The structure can be applied to an electromagnetic cooking pan which employs an electromagnetic induction heating device as a pan heating means as shown in FIG. 12, for example.

Therefore, the lid heater control system for preventing blowout according to the present invention described above has the same structure as that shown in FIG.
The same can be applied to the second electromagnetic cooking pot as well, whereby effective measures against spillage can be taken.

First, the electromagnetic cooking pot of FIG. 12 is used for both cooking and heat retention, for example, and has a bottomed cylindrical outer case 61 configured so that the pot 60 can be set inside.
And a lid unit 62 that covers the upper portion of the outer case 61.

The outer case 61 is composed of a cylindrical cover member 63 formed of a synthetic resin plate, and a synthetic resin shoulder member 64 joined to the upper end of the cover member 63. A saucer-shaped protection frame 65 for setting the pan 60 so that it can be taken out is provided inside.

A center sensor 66 that contacts the bottom surface of the pot 60 is provided in the center of the bottom surface of the protective frame 65, and an annular work coil WC ₁ is arranged so as to surround the center sensor 66. ing. Further, in the center sensor 66, a temperature sensing element for detecting the temperature of the pot 60.
(Not shown) and a rice cooker set sensor (not shown) for detecting whether or not the pan 60 is set are incorporated.

The lid unit 62 is formed in a hollow structure by an outer cover 67 made of synthetic resin forming the outer peripheral surface and an inner cover member 68 made of synthetic resin forming the inner peripheral surface. The peripheral portions of 67 and the inner cover member 68 are joined together by high frequency welding or the like. The lid unit 62 is rotatably attached to the position side of the shoulder member 64 via a hinge mechanism 69, and its open end side is engaged with a predetermined position of the lid unit 62 to close the lid. A lock mechanism 70 for maintaining the closed state of the unit 62 is provided.

Further, a vapor discharge port 71 is provided at a substantially central portion of the lid unit 62, and the vapor discharge port 7 is provided.
A vapor discharge cylinder mounting hole 72 is formed in the lower part of 1. A vapor discharge cylinder 73 is attached to the vapor discharge cylinder mounting hole 72.

Further, the inner cover member 68 of the lid unit 62 is attached with a heat radiating plate 74 having a size corresponding to the upper opening of the pot 60, and the steam radiating plate 74 has a central portion. The lower portion of the vapor discharge cylinder 73 for releasing the vapor to the outside through the inlet 75 is fixed. Further, between the cover 68 of the lid unit 62 and the pot 60,
The inner cover 68 is hermetically sealed by a packing 76 attached to the peripheral portion of the inner cover 68 to prevent the steam from leaking outside from a portion other than the steam introducing port 75.

A heat insulation heater H ₂ is further provided on the outer surface of the side peripheral portion of the pot 60, and a lid heater H ₃ is provided on the heat dissipation plate 74. The heat-retaining heater H ₂ is mainly used to keep the cooking food warm and prevent spoilage, and the lid heater H ₃ heats the radiator plate 74 by heat conduction to heat the upper surface of the pot 60 and the radiator plate 7.
The water droplets generated on the surface of No. 4 are evaporated.

A microcomputer unit 23 for controlling the power supply to the work coil WC ₁ , the heat retention heater H ₂ and the lid heater H ₃ is housed between the protective frame 65 and the outer case 61. An operation panel 22 that constitutes an operation unit is provided on the front side extension of the shoulder member 64. The operation panel 22 is provided with various switches necessary for cooking, and a liquid crystal display section for displaying a cooking menu selected by each of these switches, a cooking level, etc., and making it visible to the user. .

Based on the pan temperature detection value of the temperature sensing element of the center sensor 66 by the microcomputer unit 23, the work coil W similar to that shown in FIG.
The duty control of C ₁ , the heat retention heater H ₂ , and the lid heater H ₃ is performed, and cooking without spillage is performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of an electric rice cooker body in an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the electric rice cooker body.

FIG. 3 is an electric circuit diagram showing a configuration of a control circuit unit of the electric rice cooker.

FIG. 4 is a graph showing basic rice cooking characteristics of the electric rice cooker.

FIG. 5 is a flowchart showing a heater control content of the electric rice cooker.

FIG. 6 is a flowchart continued from FIG. 5 showing heater control contents of the electric rice cooker.

FIG. 7 is a flow chart showing the heater control contents of the electric rice cooker continued from FIG. 6;

FIG. 8 is an enlarged cross-sectional view showing a second structural example of the steam cap portion of the electric rice cooker.

FIG. 9 is an enlarged cross-sectional view showing a third structural example of the steam cap portion.

FIG. 10 is an enlarged cross-sectional view showing a fourth structural example of the steam cap portion.

FIG. 11 is a cross-sectional view showing the structure of an electromagnetic cooking pot as another application example of the present invention.

FIG. 12 is a cross-sectional view showing the structure of a conventional electric rice cooker.

[Explanation of symbols]

1 is an outer case, 6 is a rice cooker, 7 is a lid unit, 8 is an outer cover, 9 is an inner cover member, 10 is a heat radiating plate, 11 is a steam discharge port, 12 is a steam discharge passage, 14 is a steam cap, 2
3 is a microcomputer unit, 28 is a center sensor, H ₁ is a rice cooking heater, H ₂ is a heat retention heater, H ₃ is a lid heater, and WC ₁ is a work coil.

Claims (1)

(57) [Claims] 1. A container to be heated, a case for accommodating the container to be heated, a lid of the container to be heated, a steam outlet provided in the lid, and first heating for heating the container to be heated. Means, rice cooking amount determining means for determining the amount of cooked rice, and controlling the heating state of the first heating means according to the rice cooking amount determined by the rice cooking amount determining means, and maintaining the boiling heating state within a predetermined time In a heating and cooking container with a lid comprising a first heating control means, a heat radiating plate forming a lower surface of the lid, a second heating means for heating the heat radiating plate, and the first heating When the boiling heating state within a predetermined time by the control means is maintained, the temperature of the heat dissipation plate to such an extent that the droplets adhering to the heat dissipation plate can be evaporated and vaporized in accordance with the rice cooking amount judged by the rice cooking amount judgment means. The heating state of the second heating means is controlled so that A lid-added heat cooking container provided with a second heating control means for controlling.