JPH071060Y2 - rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a rice cooker for uniformly heating and cooking a cooked material such as rice.

<Prior Art> A conventional example will be described based on the cross-sectional views of the essential parts of the rice cooker shown in FIGS. 4 and 5.

FIG. 4 shows a hot plate type rice cooker, including an outer pot 61 on which a heat insulating material 63 is wound, and an inner pot 62 which is detachably fitted into the outer pot 61 and accommodates cooked foods such as rice. have.

Reference numeral 64 denotes a heater embedded in a disk-shaped heat plate 65 that is attached in contact with the bottom surface of the inner pot 62, and the heat of the heater 64 is distributed to the entire bottom surface of the inner pot 62 by the heat plate 65. Is. FIG. 5 shows a radiant type rice cooker, which is different from the hot plate type in that the heater 67 is formed in the outer peripheral portion of the inner pot 62.
It is located at 66. The heat of the air in the space 66 heated by the heat of the heater 67 is distributed to the entire inner pot 62.

<Problems to be Solved by the Invention> However, in the conventional rice cooker described above, it is difficult to uniformly heat the cooked food.

That is, in the case of the hot plate type rice cooker shown in FIG.
65 is disposed so as to contact the bottom surface of the inner pot 62, and the heat from the hot plate 65 is transferred to the inner pot 62 from the bottom.

Therefore, the cooked food contained in the inner pot 62 has a large temperature difference between the upper part and the lower part during heating. For example, when rice is cooked with this rice cooker, the moisture content at the upper part of the inner pan 62 is reduced. While rice with a little dryness is cooked, rice with a high water content is cooked at the bottom of the inner pot 62.

Further, in the case of the radiation type rice cooker shown in FIG. 5, since the heater 67 is arranged in the space, a high processing accuracy is not required. However, in this case, since the radiant heat in the vicinity of the fitting of the heater 67 and the terminal portion is weaker than the radiant heat in other portions, temperature unevenness occurs on the bottom surface of the inner pot 62.

As described above, the conventional rice cooker causes uneven heating due to uneven heating of the bottom surface of the inner pot 62 or a large temperature difference between the upper portion and the lower portion of the food contained in the inner pot 62 during heating. As a result, the taste is deteriorated.

<Means for Solving the Problems> The present invention provides a rice cooker capable of uniformly distributing the heat of the heater to the entire inner pot to evenly heat the food to prevent uneven cooking. The purpose is to have an inner pan for containing food and an inner case for removably fitting the inner pan. Between the inner pan and the inner case, the inner pan is brought into contact with the bottom of the inner pan. First heating means for heating the pan, a partitioning member for partitioning a space formed by the inner pan and the inner case, having an opening at the bottom and side surface below the first heating means, and this partitioning member Second heating means provided in the space formed by the inner pot and a fan for circulating the air in the divided space through the opening.

<Operation> According to the above configuration, the space portion formed by the inner pot and the inner case in the rice cooker body is divided by the dividing member,
An opening is formed in the side surface and the center of the bottom surface of the partition member, and in the bottom surface of the inner case.

Each of these openings is communicated with the divided space, and the air provided in the divided space is circulated through the opening by the fan provided at the bottom of the bottom of the inner case. The circulated air comes into contact with and is heated by the first heating means and the second heating means arranged on the bottom surface of the inner pot.

When the heated air circulates, it also heats the side peripheral surface of the inner pot, so that the bottom of the inner pot is heated by the first heating means and the side of the inner pot is heated by the circulating hot air.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a cross-sectional structure diagram showing a main part of the rice cooker. In the figure, 1 is a rice cooker body for heating cooked foods such as rice,
The upper case has a lid body 2 which is openably and closably attached, and an outer case 22 having an opened upper surface is provided at the outermost periphery. The outer case 22 has a plurality of legs 23 ... . On the inner peripheral side of the outer case 22, the heat insulating material 5 is annularly provided along the outer case 22. Also, on the inner peripheral side of this heat insulating material 5,
An upper case is opened, and an inner case 4 is provided in which an inner pot 11 described later can be loosely fitted and accommodated.

The inner case 4 is, for example, a press-molded steel plate, and is screwed or clawed to an upper frame 6 formed in an annular shape made of, for example, heat-resistant plastic, the upper end of which is fitted to the inner peripheral surface of the upper end. It is fixed by a stop. Further, the bottom surface of the inner case 4 is formed with a central portion and openings 4a and 4b on the sides of the central portion. On the inner peripheral side of the inner case 4 described above, an inner pot 11 for containing cooked food such as rice is removably fitted. The inner pot 11 is, for example, aluminum press-molded into a bottomed cylinder. The outer peripheral surface is anodized, and the inner peripheral surface is coated with a fluororesin. As a result, the inner pot 11 can be easily washed after cooking.

A suction case 52, which is a partition member, is disposed between the inner pan 11 and the inner case 4.
Is configured to divide a space portion formed by the inner pot 11 and the inner case 4 to form an air circulation path. A flange portion 52c is formed on the upper edge portion of the suction case 52, and the flange portion 52c is supported by the upper frame 6 described above. In addition, the suction case 52 has an opening 52d for communicating the space portion divided by the suction case 52.
Is formed on the side surface of the. Further, the heat retaining heater 30 is provided on the side surface outer peripheral portion of the suction case 52. Further, on the bottom surface of the suction case 52, an opening 52a having a diameter substantially equal to that of the opening 4a of the inner case 4 is formed in the central portion.

On the inner peripheral side of the opening 52a, a heat sensitive body 24 for detecting the temperature of the inner pot 11 is arranged so as to abut on the central portion of the bottom surface of the inner pot 11. The heat sensitive body 24 is connected from the opening 4a of the inner case 4 via lead wires 25, 25 to a control board 26 on which a microcomputer or the like is mounted.
The control board 26 is fixed to the heat shield plate 27 with, for example, screws. A power cord 40 is connected to the control board 26 so that power is supplied from the outside, and the power cord 40 is a cord reel provided adjacent to the control board 26.
It is wound around 28. Around the heat sensitive body 24, the first heating means is arranged so as to contact the bottom surface of the inner pot 11. The first heating means is composed of an annular hot plate member 51 and a heater 7 embedded in the hot plate member 51, such as a sheath heater having a capacity of 700 W. This makes the inner pot
The heat of the heater 7 is transferred to the entire bottom surface of the heater 11 via the hot plate member 51. Further, the second portion is located in the outer region of the outer peripheral portion of the hot plate member 51 and in the region below the bottom surface of the inner pot.
A heater 7a, which is a heating means, is provided. This heater
7a is composed of an annular sheathed heater or the like having a capacity of 200 W, and is fixed to the bottom surface of the inner case 4 by screws or the like.

In addition, the outer periphery of the hot plate member 51 has an opening through which air circulates.
An annular waste receiving member 12 provided with a plurality of 12a is arranged so that the inner peripheral side is fixed to the hot plate member 51 and the outer peripheral side is in contact with the suction case 52. The air from the opening 4a flows in the outer peripheral direction between the bottom surface of the hot plate member 51 and the bottom surface of the suction case 52, and receives heat from the hot plate member 51 and the heater 7a.
Further, a hood 32 is provided on the bottom side of the inner case 4 on the lower side. The outer peripheral end of the hood 32 is raised, and the outer peripheral end is opened at the opening 4b on the bottom surface of the inner case 4.
And connected to the outside of 4a. The hood 32 is formed with an opening 32a having a diameter smaller than the diameter of the opening 4a, and the periphery of the opening 32a is raised at a height where it abuts against the hot plate member 51. In the space 44 formed by the hood 32 and the inner case 4, a fan 9 for sending air is provided below the opening 4b. As a result, the fan 9 allows the air introduced from the space 43 formed by the suction case 52 and the inner case 4 through the opening 4b to be introduced into the space.
A space formed by the side peripheral surface of the inner pan 11 and the side peripheral surface of the suction case 52 for sending out the air heated by the heat plate member 51 and the heater 7a from 44 through the opening 4a to the hot plate member 51. It is made to flow into the portion 45 and circulate along the side peripheral surface of the inner pot 11.

The fan 9 is provided with a rotary shaft 31 at the center of rotation, and the rotary shaft 31 is provided through a through hole 32b formed in the hood 32. And this rotating shaft 31
Is provided with a motor 36 for driving the rotating shaft 31 at its lower end, and a cooling fan 35 for cooling the motor 36 and the like is provided in the motor 36.
And the hood 32. Further, in the outer case 22 located around the motor 36, vent holes 41a ... Introducing external air to the cooling fan 35 are provided in the lower portion of the motor 36.
Exhaust holes 41b ... Are formed at substantially the same horizontal positions as the cooling fan 35. The rice cooker main body 1 having the outer case 22 is provided with a lid body 2 which can be openably and closably attached on the upper surface thereof. The lid 2 is provided with a display substrate 38 so that the set time or the like can be confirmed from above. Below the display substrate 38, the lid cover 14 and the holder
15 and the inner lid 13 are provided at a predetermined interval in this order,
The lid space 46 formed by the holder 15 and the inner lid 13 is
A space is provided between the flange portion 52c of the suction case 4 and the flange portion 11a formed on the upper end edge of the inner pot 11 so as to communicate with the main body space portion 45 of the rice cooker main body 1.

Further, the lid body 2 includes the lid body space portion 46, the inner lid 13 and the inner pot.
An opening 39 for communicating the space formed by 11 to the outside
Are formed. At the upper edge of the opening 39, the lid 2
A steam cap 42 is provided to prevent direct contact with steam.

The lid 50 is fixed by the lid cover 14 and the holder 15 to prevent air leakage between the main body space 45 and the lid space 46, and is provided so as to abut the flange portion 52c of the suction case 52. It is packing.

Next, the operation of the above-described embodiment of the present invention will be described.

First, when a rice cooking switch (not shown) or the like is pressed, energization of the heaters 7 and 7a and the motor 36 is started. Then, the heater 7 heats the hot plate member 51, and the hot plate member 51 turns into the inner pot 11
Will heat the entire bottom surface of. In addition, the motor 36
Rotates the fan 9 and the cooling fan 35,
Is a space member formed by the suction case 52 and the inner case 4.
The air of 43 is sucked from the opening 4b. The sucked air is
The hood 32 and the inner case 4 are sent out by the fan 9 in the outer peripheral direction.
From the space portion 44 formed by the bottom surface of the above, it reaches the hot plate member 51 through the opening 4a. The air is heated by the hot plate member 51.
After being heated by the heater 7a and the heater 7a, the space 45 formed by the inner pot 11 and the suction case 52 rises. On this occasion,
The side peripheral surface of the inner pot 11 is heated by the air rising in the space 45. Next, the air that has reached the upper portion of the space 45 passes through the opening 52d and flows into the space 43, and is sucked into the space 44 again by the fan 9 from the opening 4b of the inner case 4.

Also, a part of the air that heats the side surface of the inner pot 11 rises further upward, and the flange portion 52c of the suction case 52 and the inner pot 1
Due to the gap provided between the first flange portion 11a and the first flange portion 11a,
Flows into the space 46, heats the upper surface of the inner lid 13, and is discharged to the outside through the opening 39 provided in the lid 2.

Thus, in addition to the hot plate member 51 heated by the heater 7, the air heated by the hot plate member 51 and the heater 7a circulates the side surface of the inner pan 11 to heat the inner pan 11. It is done by doing.

Next, as shown in FIG. 2, the cooked food contained in the inner pot 11
The temperature characteristics, which are changes in temperature rise at the lower center A and the upper center B of 54, were measured using the conventional rice cooker and the rice cooker of this example. As a result, the temperature of the conventional rice cooker is significantly lower than the temperature of the lower center A shown in FIG. 3, while the rice cooker of the present embodiment is the temperature of the upper center B shown by the chain double-dashed line. It is confirmed that is close to the temperature of the lower center A indicated by the solid line. As a result, the rice cooker can uniformly heat the inner pot 11 shown in FIG. 2 from the upper portion to the lower portion, so that it is possible to prevent uneven cooking of the cooked food 54 contained in the inner pot 11.

In addition, the temperature balance from the top to the bottom of the inner pot 11,
It can be changed depending on the circulation amount of air. The air circulation amount can be varied without adjusting the rotation speed of the motor 36 by changing the diameter of the opening 52d formed in the suction case 52 which is the partition member shown in FIG. Is possible.

And, as an effect of the rice cooker having the above-mentioned configuration, the central diameter of the heater 7a is outside the outer diameter of the heater 7 or the inner pot 11
By setting the area below the bottom surface, it is possible to efficiently heat the outer peripheral portion and the outer surface of the inner pot, which is a drawback of the hot plate method, and it is possible to achieve even heating, and even cooking of uneven cooking is further reduced. Become.

Further, by making the power consumption of the heater 7a smaller than that of the heater 7, the inner pot 11 can be heated uniformly from the upper portion to the lower portion. Further, by providing the waste receiving member 12 between the heater 7 and the partitioning member 52, it is possible to prevent rice grains, dust, etc. that have fallen into the inner case 4 from entering between the inner case 4 and the hot plate member 51. This has the effect of improving cleanability.

Further, by providing the heat retaining heater 30 in the upper region of the outer peripheral portion of the partitioning member 12, the heater can be brought as close as possible to the inner pot 11, and it is possible to prevent the occurrence of soup accumulated on the inner surface of the inner pot 11. Therefore, it is possible to prevent deterioration of the cooked food.

Further, on the lower surface of the lid body 2, a lid cover 14, a holder 15,
The inner lids 13 are provided at a predetermined interval in this order, and the lid body space 46 formed by the holder 15 and the inner lid 13 communicates with the space formed by the partitioning member 12 and the inner pot 11. At the same time, since the lid packing 50 fixed to the lid body 2 and abutting on the flange portion 52c of the partition member 12 is provided,
It is possible to prevent air leakage that communicates with the main body space and the lid space 46.

Further, the outer case 22 below the motor 36 is provided with the intake hole 41a and the exhaust hole 41b at a position substantially horizontal to the cooling fan, so that the cooling air introduced from the intake hole 41a efficiently cools the motor 36 and the cooling fan 35 And an exhaust hole provided in a substantially horizontal position
Since the air is efficiently exhausted from 41b, the cooling efficiency is improved, and it is possible to prevent the heat insulating material and the like provided inside the main body from scattering.

<Effects of the Invention> As described above, the present invention has an inner pan that absorbs cooked food and an inner case in which the inner pan is detachably fitted, and the inner pan and the inner case are provided. Between the first heating means, which is in contact with the bottom surface of the inner pan to heat the inner pan, and which is formed by the inner pan and the inner case having an opening at the bottom surface and side surface below the first heating means. A partition member for partitioning the open space portion, and a second space provided in the space portion formed by the partition member and the inner pot
Since heating means and a fan for circulating the air in the divided space through the opening are provided,
With the air circulating along the side peripheral surfaces of the first heating means and the second heating means that are in contact with the bottom surface of the inner pot, it becomes possible to uniformly heat the inner pot, and the inner pot is housed. It is possible to prevent uneven cooking of cooked foods.

[Brief description of drawings]

FIG. 1 is a cross-sectional structural view of a main part of a rice cooker showing an embodiment of the present invention, FIG. 2 is an explanatory view showing a lower center and an upper center of a food item stored in an inner pot, and FIG. 3 is an inner pot. Fig. 4 is a temperature characteristic diagram of the lower center and the upper center of the cooked foods housed in the table. It is a principal part sectional structural drawing of a container. 1 ... rice cooker body, 2 ... lid, 4 ... inner case, 4a ... inner case 4
, 7a ... Heater, 9 ... Fan, 11 ... Inner pan, 12 ... Waste receiving member, 12a ... Waste receiving member opening, 13 ... Inner lid, 14 ... Lid cover, 1
5 ... Holder, 30 ... Heat insulation heater, 35 ... Cooling fan, 36 ... Heater, 41a ... Intake hole, 41b ... Exhaust hole, 46 ... Lid space, 50 ... Lid packing, 51 ... Hot plate member, 52 ... Partitioning member (Suction case), 52
a, 52d ... opening of the partition member, 52c ... flange portion of the partition member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideshi Nakagawa 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Sharp Corporation (72) Shuji Takeda 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside the company

Claims (1)

[Scope of utility model registration request] 1. A rice cooker body and a lid body, wherein the rice cooker body has an inner pot for containing food to be cooked and an inner case in which the inner pot is detachably fitted. Between the inner case and the inner case, there is provided a first heating means that abuts on the bottom surface of the inner pan to heat the inner pan, and an opening is formed in the bottom surface and the side surface below the first heating means. And a second heating means provided in the space formed by the partition member and the inner pot, and the air in the divided space is circulated through the opening. A rice cooker characterized by being provided with a fan.