JP2000051069A - Jar rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jar rice cooker capable of eliminating whitening and sticking of rice when rice is kept warm and improving taste and odor of rice while rice is kept warm. SOLUTION: A process in which dew adhering on a pot 2 and a lid 7 when rice is kept warm is evaporated is provided, and a heating condition is changed by closing and opening the lid in the process so that dew adhering on the lid and around the pot due to steam of rice when rice is kept warm is evaporated to prevent the dew from dropping on rice.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jar rice cooker used for general household or business use.

[0002]

2. Description of the Related Art Conventionally, this type of rice cooker is, for example, shown in FIG.
The configuration shown in FIG. In FIG. 12, 1
Is a cylindrical body 51 having an open upper surface.
A protection frame 52, which is a storage portion for a pot 53, is disposed inside the protection frame 52. The protection frame 52 is formed of a non-metallic material into a bottomed cylindrical shape. It is engaged around.

Reference numeral 53 denotes a pot having an outwardly projecting flange 54 formed at an upper end opening thereof. The pot 53 is mounted on the upper surface of an upper frame 55 in a suspended state, thereby forming a protective frame 5.
2 is detachably disposed. An induction coil 56 is provided outside the protection frame 52, and the induction coil 56
The protection frame 52 is supported by a coil cover 57 formed of a heat-resistant resin material at a lower portion of the outer circumference of the protection frame 52 so that the distance to the outer circumference of the pot 53 is constant.

Reference numeral 58 denotes a synthetic resin outer cover.
Is rotatably supported via a pin 60 on a hinge member 59 integrally formed on the upper portion of the upper frame 55. Reference numeral 61 denotes an inner cover, and the inner cover 61 is fixed to the inner surface of the outer lid 58. The inner cover 61 has a heating plate 62 as a heating element.
Is fixed, and a lid induction coil 64 supported by a coil support 63 is located above the heating plate 62. Due to the electromagnetic action of the lid induction coil 64, the heating plate 6
2 generates heat. Further, a sensor 65 for detecting the temperature of the heating plate 62 is directly attached to the heating plate 62 with an aluminum tape to adjust the temperature of the heating plate 62.

Reference numeral 66 denotes an engaging member which is located on the opposite side of the hinge member 59 and is integrally formed on the upper end of the protection frame 52. The engaging lever 6 is attached to the outer lid 58 so as to face the engaging member 66.
7 is rotatably instructed via a pin 60. When the outer lid 58 is closed, the pan packing 69 is pressed against the flange 54 of the pan 53 to hermetically close the pan 53.

Reference numeral 70 denotes a steam cylinder, which prevents squirt from spilling outside. Reference numeral 71 denotes a control board, which controls input and output of a current to the induction coil 56 and input and output of a signal of the operation display unit 72. A cooling fan 73 cools the control board 25 and the induction coil 56.

[0007]

However, in the rice cooker having the above-described structure, the dew due to the steam of the rice adheres around the lid and the pot during the heat insulation, and the rice is whitened by dripping on the soybean rice. There is a problem that causes stickiness, impairs the taste of the rice during the heat retention, and causes odor to the rice during the heat retention.

[0008] The present invention solves the above-mentioned problems, and eliminates the dew due to the steam of the rice during the heat retention and adheres to the periphery of the lid and the pan. Eliminating choking and improving the taste of cooked rice and the smell of cooked rice.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a main body, a pan removably stored in the main body, a lid for opening and closing the pan, and a heating means. A step of evaporating dew adhering to the pot and the lid is provided, and a heating state and the like when evaporating the dew according to opening and closing of the lid are changed as necessary.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claims 1 to 11 comprises a main body, a pot removably stored in the main body, a lid for opening and closing the pan, and a heating means for heating the lid. By providing a process for evaporating dew adhering to the pan and lid during heat insulation, dew can be prevented from adhering to the lid, and soup can be prevented from dripping onto rice, thereby reducing whitening and stickiness of rice. Thus, it is possible to improve the taste and smell of rice while keeping warm.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

First, the configuration of the jar rice cooker according to the present invention will be described. In FIG. 1, the main body 1 is
Like the conventional jar rice cooker, it is opened on the upper surface, a pot 2 for storing the food to be heated is arranged inside the main body 1, a protection frame 3 on which the pot 2 is placed, and a protection frame 3 placed around the protection frame 3. A bottom heater 4 as a pan bottom heating means is fixed. If the bottom heater 4 is IH, the heating power is increased, heating can be performed quickly, and fine heating control can be performed, so that more delicious rice can be cooked. A bottom sensor 5 for detecting the temperature of the pan bottom surface 28 is disposed on the pan bottom surface 28 as pan temperature detecting means, and means for estimating the rice cooking and heat retaining state from the temperature is employed.

On the side of the protective frame 3, a side heater 6 is provided as a pot side heating means for heating the side of the pot. If the side heater 6 is IH, the heating power becomes large, heating can be performed quickly, and fine heating control can be performed. In addition, the heat efficiency when heating the pan 2 is further improved, and the heat insulation is improved.
It is possible to cook more delicious rice, and the effect of removing dew attached to the pot 2 is further enhanced.

The upper openings of the main body 1 and the pan 2 are openably and closably covered by a lid 7. The lid 7 is, on one side of the main body 1, a hinge shaft 8 which is pivotally supported so as to be openable and closable. On the opposite side, the main body 1 has an engaging portion 10 that engages with the lid 7 via the hook button 9. A hinge spring 11 is provided on the hinge shaft 8 so that a force is applied to the cover 7 in the cover opening direction (FIG. 2). Reference numeral 7a is an outer lid that forms the outer surface of the lid 7.
An outer lid cover 7b covers the pot side of the outer lid 7a. The outer lid cover 7b has a lid heater 1 as a heating means for heating the lid.
2 are arranged.

Further, a heating plate 13 which is heated by heat generated by the lid heater 12 is disposed on the side of the outer lid cover 7b. If the lid heater 12 is an IH heater, the heating plate 13 is more efficiently heated by the lines of magnetic force, so that more delicious rice can be cooked. In addition, heating can be quickly performed, fine heating control can be performed, and high heat insulating properties and an effect of more effectively removing dew adhering to the lid 7 can be obtained. The heating plate heat generating portion 13a that generates heat is usually made of aluminum,
In the case of IH, stainless steel or iron-based metal is used as a material. Further, a lid sensor 14 for detecting the temperature of the heating plate 13 is provided so as to be in contact with the heating plate 13, and means for estimating the rice cooking and heat retaining state from the temperature is employed.

A steam cylinder 16 having a float 15 movable inside when the lid 7 is opened and closed, and a float detection unit 17 for detecting the movement of the float 15 are provided around the steam cylinder 16 inside the lid. The float 15 moves to the hinge 18 when the lid 7 is opened, and detects the opening and closing of the lid 7 as lid opening / closing detecting means, thereby forming a lid opening / closing detection mechanism 26 (FIG. 3). Specifically, float 15
To the magnet 20, and the reed switch 21 to the float detector 17.
There is a means for detecting the opening and closing by using the Other body 1 and lid 7
A method of arranging a magnet 20 on one side and a reed switch 21 on the other side to detect the opening and closing of the lid 7, and a contact type switch that operates in conjunction with the opening and closing operation of the lid 7 on the lid 7 or the main body 1. There is also a method in which 22 is provided.

Reference numeral 19 denotes a room temperature sensor which detects the outside air temperature around the main body 1 and controls the rice cooking and the heat keeping state based on the detected temperature. The heating board 23 supplies power to each heater, and the control board 24 controls heating of each heater to an optimum state based on information obtained from each sensor.

Next, the operation of the jar rice cooker according to the present invention will be described with reference to FIG. A microcomputer 25 is provided on the control board 24. The microcomputer receives a signal input from the operation unit, and controls heating of the rice cooker based on a program recorded in the microcomputer 25 in advance. The program is programmed to control the heating of the rice cooker using output signals from the bottom sensor 5, the lid sensor 14, the room temperature sensor 19, and the lid opening / closing detection mechanism 26 as input signals.

Next, a method of controlling heating of a jar rice cooker according to the present invention will be described with reference to FIGS. 5 to 7, the vertical axis indicates the temperature of the bottom sensor or the lid sensor and the power of each heater, and the horizontal axis indicates the elapsed time immediately after the end of rice cooking.

Immediately after cooking, the temperature of the rice in the pot is about 100 ° C. The microcomputer 25 is programmed to automatically maintain the temperature when the rice cooking is completed, and shifts to the heat retention when the rice cooking is completed. In order to optimally control the temperature of the rice while keeping the temperature, a process is provided in which the amount of heating differs according to the temperature of the rice. Here, in the normal heat retention, the optimal temperature for keeping the rice when the rice is kept warm is around 70 ° C., and it is necessary to lower the temperature of the rice around 30 ° C. When the temperature of the rice decreases, the saturated vapor pressure in the pan decreases, and the steam that has been saturated at the time of high temperature becomes dew as the temperature decreases and adheres to the lid 7 and the side surface 27 of the pan. In addition, dew generated from the rice in proportion to the temperature drop of the rice adheres to the lid 7 and the pot side surface 27. Dew adhering to the lid 7 and the pot side surface 27 drops on the rice and causes whitening and stickiness of the rice. Therefore, conventionally, in order to reduce the dew attached to the lid 7 and the pot side 27, the lid 7 and the pot side 27 have been slightly heated during the temperature drop of the rice. But,
When the temperature of the rice drops, the dew is generated immediately after the rice is cooked, and if the lid 7 is kept closed without the rice being unraveled, more dew is generated than when the rice is unraveled. It changes depending on the outside temperature around the jar rice cooker.

The most distinctive feature of the jar rice cooker of the present invention is that the lid 7
And a step of heating and controlling the temperature of the rice to evaporate the dew generated during the temperature reduction of the rice.
6 in conjunction with the opening and closing of the lid 7 while keeping the temperature and the outside air temperature around it. By evaporating the dew attached to the lid 7 more effectively, the taste of the rice for keeping the heat can be improved. Yes, it can improve the smell of rice while keeping warm.

When the lid 7 is opened and closed, the dew adhering to the lid 7 evaporates and decreases. Therefore, before and after the lid 7 is opened and closed, heating before opening and closing the lid 7 is more effective than after opening and closing the lid 7 to evaporate more dew. It can be evaporated, and the taste of the warm rice can be improved (FIG. 5). Since the occurrence of dew increases with the passage of time, if the lid 7 is not opened and closed within a specific time after the completion of rice cooking, the dew can be effectively evaporated by heating the lid 7 more. Here, the specific time, which is t1 in FIG. 5, varies depending on the heat retention amount and the ambient temperature of the jar rice cooker, and can be determined based on the amount of rice cooked and the outside air temperature detected by the room temperature sensor 19.

The temperature of the rice is detected by the bottom sensor 5.
In order to keep the heated rice delicious, it is necessary to quickly adjust the temperature of the rice to the optimal temperature, but if the lid 7 is heated too much to evaporate the dew generated on the lid 7 while the temperature of the rice is falling, It takes time to lower the temperature. Moreover, when the lid 7 is not opened and closed immediately after cooking rice, it takes more time to lower the temperature of the rice. Therefore, when the lid 7 is not opened and closed immediately after cooking rice, when the temperature of the rice at which the dew occurs is reached, the lid 7 is heated more and the step of evaporating the dew of the lid 7 is provided. The dew can be more effectively evaporated by controlling the process to return to the original process after evaporating. That is, it is more effective to provide a step of evaporating dew when the bottom sensor 5 detects a specific temperature, for example, θ1 in FIG. 5 when the lid 7 is not opened and closed immediately after cooking rice.

In order to keep the rice in an optimum state during the heat retention, various processes having different heating amounts are provided as shown in FIG. 6, for example, according to the temperatures detected by the bottom sensor 5 and the lid sensor 14. The state of the dew on the lid 7 varies depending on each process, and it is easy to occur in the process in which the temperature of the rice falls. Therefore, if the lid 7 is not opened and closed after the rice cooking until the process in which dew is most likely to occur, the lid 7 is heated more and a process for evaporating the dew is provided, so that the dew attached to the lid 7 can be effectively removed. It can evaporate and improve the taste of warm rice. Even if the dew on the lid 7 is evaporated once, dew is generated on the lid 7 again as the temperature of the rice drops. Therefore, a step of heating the lid 7 more and evaporating the dew on the lid 7 at a specific time interval from immediately after the rice cooking until the lid 7 is opened and closed, for example, at a time interval from t1 to t4 in FIG. Thus, the dew generated in the step of lowering the temperature of the rice can be evaporated. The same effect can be obtained by increasing the amount of heating of the lid 7 according to the change in the temperature of the rice.

During the heat retention, even if the lid 7 is once opened and closed,
If the lid 7 is kept closed for a certain period of time, the lid 7 is exposed again. Therefore, if the lid 7 is not opened and closed for a certain period of time after the lid 7 is opened and closed once, for example, if the lid is not opened and closed during the time from t1 to t3 in FIG.
Is heated more and the step of evaporating the dew is provided, so that the dew attached to the lid 7 can be effectively evaporated.

The dew that occurs during the heat retention is first generated on the lid 7, but also on the portion of the pot side 27 that is not in contact with the rice, causing the pot side 27 to be loose and dripping on the rice around the pot. Doing so whitens the rice around the pot and causes stickiness. Therefore, the pot side heating means for heating the pot side 27 has been used, and the pot side has been heated slightly while the temperature of the rice is decreasing in order to reduce the dew attached to the pot side 27. However, when the temperature of the rice drops, the dew is generated immediately after the rice is cooked, if the lid 7 is closed without being loosened, more dew is generated than when the rice is loosened, and the amount of generated dew is kept warm. It changes depending on the quantity and the outside temperature around the jar rice cooker.

Therefore, as shown in FIG. 6, there is provided a step of controlling the heating of the side surface 27 of the pot and evaporating the dew generated during the temperature drop of the rice. Dew on the pot side surface 27 can be effectively evaporated by changing the opening and closing of the inner lid 7 and the surrounding outside air temperature. That is, by performing the same control as the above-described step of evaporating the dew on the lid 7 also on the heating means of the pan side 27, the dew generated on the pan side 27 can be effectively evaporated, and the heat retention can be achieved. The taste of the rice can be improved and the smell of the rice kept warm can be improved. Since the heat capacity of the pot 2 is larger than that of the lid 7, a large amount of heating is required to evaporate the dew on the side surface 27 of the pot. So slightly in Figure 7
By heating the bottom surface 28 as well, the dew generated on the side surface 27 of the pot can be more effectively evaporated, the taste of the rice for keeping warm can be improved and the smell of the rice for keeping warm can be improved.

Next, a method of controlling heating in the step of removing dew will be described. In order to evaporate the dew that has been generated and adhered to the lid 7 and the pot side surface 27, the dew can be evaporated by heating for more than a predetermined time. However, since the amount of dew varies depending on the heat retention amount, the heating amount may be too large or too small depending on the heat retention amount. Therefore, by changing the heating amount according to the heat retention amount, the dew on the lid 7 and the pot side surface 27 can be more effectively evaporated.

The temperature at which the dew of the lid 7 evaporates is specified by the temperature detected by the lid sensor 14, and the temperature of the lid sensor 1 is determined.
4 is to heat more than necessary to detect a specific temperature, for example, in FIG. 5 until the lid sensor detects φ2, thereby providing sufficient and necessary heating to evaporate the dew on the lid 7 and the pot side surface 27. And dew can be more effectively evaporated. The same effect can be obtained by heating the lid sensor 14 for more than a predetermined time while maintaining the specific temperature.

The amount of dew varies depending on the temperature of the rice. Therefore, by changing the heating amount from the temperature of the pot bottom surface 28 detected by the bottom sensor 5, dew can be effectively evaporated.

The amount of dew varies depending on the temperature around the jar rice cooker. Therefore, by changing the heating amount according to the outside air temperature detected by the room temperature sensor 19, the dew can be more effectively evaporated.

Although it has been stated that the dew on the pot side surface 27 can be effectively evaporated by slightly heating the pot bottom surface 28, the above-mentioned optimal heating temperature of rice can be obtained by excessive heating of the pot bottom surface 28. If the rice temperature is higher than about 70 ° C., the rice will be dried. Therefore, while the temperature detected by the bottom sensor 5 is maintained at a specific temperature, for example, in FIG. By heating 28, the dew on the pot side 27 can be effectively evaporated.

[0033]

As described above, according to the first to eleventh aspects of the present invention, the main body, the pan removably stored in the main body, the lid for opening and closing the pan, and the heating for heating the lid. By having a step and evaporating the dew attached to the pan and the lid at the time of keeping the heat, the dew is prevented from adhering to the lid or the side of the pan and the soup is not dropped on the rice, so that the rice is cooked. It has the effect of eliminating whitening and stickiness and improving the taste of rice during warming and the smell of rice during warming.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a jar rice cooker according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a hinge portion of the jar rice cooker.

FIG. 3 is a schematic diagram of a lid open / close detecting means of the jar rice cooker.

FIG. 4 is a schematic view of the operation of the jar rice cooker.

FIG. 5 is a schematic diagram of a heating control method of the jar rice cooker.

FIG. 6 is a schematic diagram showing another heating control method for the jar rice cooker.

FIG. 7 is a schematic diagram of still another heating control method for the jar rice cooker.

FIG. 8 is a sectional view of a main part of a conventional rice cooker.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Pot 4 Pot bottom heating means 6 Pot side heating means 7 Lid 12 Heating means 19 Pot temperature detecting means 19 Bottom sensor 26 Lid open / close detecting means

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Atsushi Korai 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazunori Kawano 1006 Okadoma Kadoma, Kadoma City Osaka Pref. (72) Inventor Masaaki Shibata 1006 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Masahiro Koyama 1006 Kadoma, Kazuma, Kadoma, Osaka Pref. BA54 BA64 CA01 CA09 CA22 CA71 CC58 CD01 CD02 CD60 DA02 DA03 DA04 DB14 GA13 GB08 GB09 GB12 GB33 GC12

Claims (11)

[Claims] 1. A main body, a pot removably housed inside the main body, a lid for opening and closing the pan, a heating means for heating the lid, and a heating state controlled by the heating means. A jar rice cooker comprising a control means, wherein the control means includes, in the heat retaining step, at least a step of removing dew to adhere to the lid. 2. The jar rice cooker according to claim 1, wherein the control means changes a heating state at the time of the exposing step depending on whether the lid is opened or closed. 3. The jar rice cooker according to claim 2, wherein the control means changes a heating state at the time of the exposing step according to before and after opening and closing of the lid. 4. The jar rice cooker according to claim 2, wherein the control means changes the heating state depending on whether the lid is opened or closed only for a predetermined elapsed time after the completion of the rice cooking. 5. The jar rice cooker according to claim 2, wherein the control means changes the heating state in accordance with opening and closing of the lid only when the temperature of the pot is equal to or higher than a predetermined value after the rice cooking. 6. The jar rice cooker according to claim 2, wherein the control means changes the heating state in accordance with the presence or absence of opening and closing of the lid only until a specific warming step after completion of the rice cooking. 7. When the lid is once opened / closed after cooking rice, the control means changes the heating state according to the presence / absence of opening / closing of the lid only after a lapse of a predetermined time after the opening / closing of the lid. The jar rice cooker according to claim 2, comprising: 8. The jar rice cooker according to claim 2, wherein the control means changes the heating state of the side of the pot depending on whether the lid is opened or closed. 9. The jar rice cooker according to claim 2, wherein the control means changes the heating state of the bottom surface of the pot according to whether the lid is opened or closed. 10. The rice cooker according to claim 2, wherein the control means changes the heating amount of the heating means at every specific time until the opening / closing operation of the lid is detected. 11. The jar rice cooker according to claim 2, wherein the control means changes the heating amount of the heating means in accordance with the specific temperature of the bottom of the pot until the opening / closing operation of the lid is detected.