JPH071059Y2 - 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 rice cooker will be described with reference to FIGS. 2 and 3.

The conventional rice cooker has a heating system of a hot plate method and a radiant method. As shown in FIG. 2, the rice cooker body 61 has an outer pot 63 on which a heat insulating member 62 is wound. And an inner pot 64 that is detachably fitted into the outer pot 63 and accommodates food such as rice.

Then, a heater 65 for heating the inner pot 64 for cooking.
To form a disk-shaped heat plate 66, and the heat plate 66 is disposed so as to abut the bottom surface of the inner pot 64,
The heat of 65 was transferred to the entire bottom surface of the inner pot 64 by the hot plate 66.

On the other hand, the radiant type rice cooker, as shown in FIG.
A space 67 is provided between the bottom of the and the outer pot 63, and this space 67
A heater 68 is installed in the above, and the heat of the heater 68 is radiated to the entire inner pot 64.

In this way, the inner pan 64 is heated by the radiant heat from the heater 68, and the cooked food contained in the inner pan 64 is uniformly heated.

<Problems to be Solved by the Invention> However, it is difficult to uniformly heat the cooked food with the above-described conventional rice cooker, and uneven cooking occurs in the finish of the cooked food.

That is, in the case of the hot plate type rice cooker shown in FIG.
It is necessary for the bottom plate of 64 and the upper surface of the heating plate 66 to come into planar contact with each other in order to uniformly transfer the heat of the heater 65 to the inner pot 64. However, the inner pot must
The contact surface between the heating plate 64 and the heating plate 66 is required to have a high degree of processing accuracy, which leads to an increase in cost of the rice cooker. Further, when the contact surface of the inner pot 64 or the heating plate 66 is deformed or corroded due to long-term use, the heating plate 66
The heat transfer from the inside to the inner pot 64 becomes non-uniform, and uneven cooking increases.

Further, in the case of the radiation type rice cooker shown in FIG. 3, since the heater 68 is disposed in the space 67, there is no need for high processing accuracy as in the hot plate type. However,
In this case, the radiant heat in the vicinity of the fitting of the heater 68 and the terminal portion is weaker than that in the other portions, so that temperature flicker is generated on the bottom surface of the inner pot 64.

Thus, in the conventional rice cooker, the heater 65 or the heater 68 is used.
It is difficult to uniformly transfer the heat of the above to the inner pot 64. Further, in the above rice cooker, since the heater 65 or the heater 68 is disposed below the inner pot 64, a large temperature difference will occur between the upper portion and the lower portion of the inner pot 64 when the temperature rises. As a result, in the conventional rice cooker, it is very difficult to prevent uneven cooking of the cooked food because the entire inner pot 64 is unevenly heated.

<Purpose> Therefore, in the present invention, it is possible to uniformly transfer the heat of the heater to the entire inner pot to uniformly heat the inner pot and the cooked food, and to provide a rice cooker capable of preventing uneven cooking. It is an object.

<Means for Solving the Problems In order to solve the above problems, a rice cooker of the present invention comprises a rice cooker body and a lid body, and the rice cooker body includes an inner pot for containing food and An inner case into which the pan is detachably fitted, a heater is arranged at the bottom of the inner case, and a fan for blowing air to the heater is arranged, and between the inner pan and the inner case. A hot air circulation space is formed in which hot air blown from the fan and heated by a heater circulates, and the lid has an inner lid that closes an upper surface opening of the inner pot and a mounting plate to which the inner lid is attached. A hot air circulation space portion communicating with the hot air circulation space portion of the rice cooker body is formed between the inner pot and the mounting plate, and the inner lid is formed by the inner lid and the inner pot. An opening communicating with the space and the space is provided, and steam generated in the inner pot is cooked in the opening. Attach one end of the steam boss discharged outside the body, to form a hot air exhaust space portion communicating with the hot air circulation space of the lid on the outer periphery of the steam boss,
The hot air space and the other end of the steam boss communicate with each other through the opening of the lid.

<Operation> According to the above configuration, the air sent from the fan is heated by the heater to generate hot air, and the hot air circulates in the hot air circulation space of the rice cooker body and the lid to uniformly heat the inner pot. The hot air of the soot circulates in the hot air circulation space of the rice cooker body and the lid, and uniformly heats the inner pot. Then, the heating of the hot air heats the inner pot, thereby heating the rice and water contained in the inner pot. After that, when the water boils and steam is generated, this steam is discharged from the steam boss to the outside of the rice cooker main body, but hot air is exhausted from the hot air exhaust space part around the outer periphery of this steam boll and discharged from the steam boss. This hot air is mixed with the steam that is generated to prevent sudden discharge of the steam from the opening of the lid.

<Embodiment> An embodiment of the rice cooker of the present invention will be described with reference to FIG.

As shown in FIG. 1, the rice cooker of the present invention has a rice cooker body 1 for heating cooked food such as rice and a lid 2.

The rice cooker main body 1 has an outer case 3 having an open upper surface on the outermost periphery, and the lower end portion of the outer case 3 is closely fitted to a bottom frame 5 having a plurality of legs 4 on the bottom surface. It is fixed.

A heat insulating material 6 is provided in an annular shape along the outer case 3 on the inner peripheral side of the outer case 3. In addition, the inner peripheral side of the heat insulating material 6 is provided with an inner case 8 whose upper surface is opened and in which an inner pot 7 described later can be loosely fitted and accommodated. This inner case 8
Is a press-formed aluminum plate or aluminum-plated steel plate having good thermal conductivity, and is formed into 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 of the outer case 3. It is fixed to the upper frame 9 by screws or claws. A central portion and openings 10 and 11 are formed on the bottom surface of the inner case 8 at the sides of the central portion, and the bottom surface of the inner case 8 rises around the opening portion 10. .

In addition, the inner pot 7 that accommodates cooked food such as rice is loosely fitted on the inner peripheral side of the inner case 8. This inner pot 7
Is, for example, aluminum which is press-molded into a bottomed cylinder, and a flange portion 7a is formed on the entire circumference of the upper end portion. The inner pot 7 is anodized on the outer peripheral surface and is coated with a fluororesin on the inner peripheral surface. As a result, the inner pot 7 can be easily washed after cooking.

Below the inner pot 7, a heat sensitive body 12 for detecting the temperature of the inner pot 7 is disposed so as to abut on the center of the bottom surface of the inner pot 7. The heat sensitive body 12 is connected from the opening 10 of the inner case 8 via a lead wire 13 to a control board 14 on which a microcomputer or the like is mounted. The control board 14 is fixed to the heat shield plate 15 in the direction of the bottom frame 5 with, for example, a screw or the like so that heating by heat from a heater 16 described later is prevented. Further, a power cord 17 is connected to the control board 14 so that electric power is supplied from the outside, and the power cord 17 is connected to a cord reel 18 provided on the bottom frame 5 adjacent to the control board 14. It is wound.

The electric cord 17 is connected to the plug-in terminal 19 arranged above the cord reel 18 via a relay mounted on the control board 14, for example, and is connected via a relay different from the relay described above. It is connected to a lateral heater 20 wound around the upper outer peripheral portion of the case 8. A terminal portion 21 of a heater 16 for heating the inner pot 7 is detachably inserted and connected to the insertion terminal 19, and the heater 16 is, for example, a sheathed heater having a capacity of 700 W. Also, this heater 16
Is formed in an annular shape around the heat sensitive body 12 described above, is fixed to the upper surface of the partition plate 24 by the support member 22 and the glass 23, and is arranged with a predetermined distance from the bottom surface of the inner case 8. It is supposed to be done.

A surface of the partition plate 24 supporting the heater 16 in the direction of the heater 16 is formed into a mirror surface so that the heat of the heater 16 is efficiently reflected to the inner pot 7. Also, this partition board
The reference numeral 24 is formed in an annular shape, the opening 25 is formed in the central portion, and the outer peripheral portion and the side peripheral surface of the inner case 8 are arranged with a predetermined gap. The opening 25 is fitted to the bottom surface of the inner case 8 which is raised around the opening 8a. This allows partition boards
A space 26 for circulating air is formed between 24 and the bottom surface of the inner case 8.

The partition plate 24 is arranged with its outer peripheral portion having a predetermined distance on the side peripheral surface of the inner case 8. However, the partition plate 24 is not limited to this, and may be, for example, the outer peripheral portion and the inner case 8 side. It may be in contact with the peripheral surface, and a plurality of openings may be formed in this contact portion.

Further, below the opening 11 formed on the side of the opening 10 in the inner case 8, a fan 27 for circulating the air interposed between the inner pan 7 and the inner case 8 is arranged. . Further, a hood 28 is arranged below the fan 27, and an outer peripheral end portion of the hood 28 is connected to a bottom surface of the inner case 8. As a result, the fan 27 sends the air introduced from the space 29 through the opening 11 to the heater 16 from the space 30 formed by the hood 28 and the bottom surface of the inner case 8 through the opening 10. Then, the air heated by the heater 16 is circulated in the space portion 31 formed by the side peripheral surface of the inner pan 7 and the side peripheral surface of the inner case 8 so that the air is circulated along the side peripheral surface of the inner pan 7. It has become. The hot air circulation space of the rice cooker body 1 is formed by the spaces 29, 30 and 31.

Further, the fan 27 is provided with a rotation shaft 32 at the center of rotation, and the rotation shaft 32 supports the hood 28, a heat insulating material 33 provided on the hood 28, and the heat insulating material 33. And a bottom plate 34 that extends. A motor 35 for driving the rotary shaft 32 is provided at the lower end of the rotary shaft 32.
A cooling fan 36 for cooling the motor 35 and the like is provided between the motor 35 and the bottom plate 34. Further, a plurality of ventilation holes 37 for introducing air from the outside to the cooling fan 36 are formed in the bottom frame 5 located around the motor 35.

The rice cooker main body 1 having the bottom plate 5 and the outer case 3 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, a lid cover 39, a holder 40 as a mounting plate, and an inner lid 41 are provided in this order at a predetermined interval, and the lid 2 formed by the holder 40 and the inner lid 41 is provided. The hot air circulation space 42 communicates with the hot air circulation space of the rice cooker body 1.

Further, the lid body 2 includes the hot air circulation space 42 and the inner lid 41.
An opening for communicating the space formed by the inner pot 7 with the outside
43 is formed. A steam cap 44 is provided at the upper edge of the opening 43 to prevent the lid 2 from coming into direct contact with steam. A hollow steam boss 45 having an opening whose upper surface has a diameter larger than that of the lower surface is loosely fitted in the opening 43, and the lower surface of the steam boss 45 is abutted against the inner lid 41 and It is connected to an opening 46 provided in the lid 41. Then, on the outer periphery of the steam boss 45, a steam boss outer cylinder 47 is provided with a space, and the lower end of the steam boss outer cylinder 47 is connected to the hot air circulation space portion 42, and the upper end is attached to the steam cap 44. A hot air exhaust space 48 is formed between the steam boss 45 and the steam boss outer cylinder 47, and the hot air exhaust space 48 and the hot air circulation space 42 of the lid 2 communicate with each other.

Inside the steam boss 45, a steam ball 49 having a diameter larger than the diameter of the opening 46 of the inner lid 41 is placed. As a result, the steam ball 49 is housed in the inner pot 7 to heat the food, and when the vapor pressure in the space formed by the inner pot 7 and the inner lid 41 rises, the steam is separated from the opening 46 to generate steam. It is designed to be discharged.

The operation when the rice cooker is used in the above configuration will be described below.

First, power is supplied from the power cord 17 to the control board 14,
The heater 16 is pressed by pressing a rice cooking switch (not shown).
And the energization of the motor 35 is started. And inner pot 7
The bottom surface of is heated by the radiant heat of the heater 16 and the reflected heat reflected by the partition plate 24 having a mirror surface.

Further, the motor 35 described above includes a fan 27 and a cooling fan 36.
The fan 27 sucks the air in the space 29 formed by the partition plate 24 and the bottom surface of the inner case 8 from the opening 11 by rotating.
The sucked air is blown out in the outer peripheral direction by the fan 27, passes through the opening 10 from the space 33 formed by the hood 28 and the bottom surface of the inner case 8 and reaches the heater 16. Then, the air is heated by the heat of the heater 16 and then rises in the space portion 31 formed by the inner pot 7 and the inner case 8. Further, this air passes through the hot air circulation space portion 42 formed by the holder 40 and the inner lid 41 in the lid body 2, and a part of it is the steam boss 45.
Hot air exhaust space 48 formed by the steam boss outer cylinder 47 and
Through the opening 43 of the steam cap 44.

At this time, the inner pot 7 is uniformly heated by the hot air circulating in the space portions 26, 29, 30, 31 and the hot air circulation space portion 42, and the cooking (rice, water) stored in the inner pot 7 by this heating. The temperature rises and steam is generated. Then, when the pressure in the space formed by the inner pot 7 and the inner lid 4 rises due to the generation of steam, and the pressure in this space reaches a pressure sufficient to lift the steam ball 49, the steam ball 49 Opening of inner lid 41
The steam separated from the steam 46 passes through the steam boss 45 and is discharged from the opening 43 of the steam cap 44.The steam passing through the steam boss 45 contains the hot air exhaust space 48.
The hot air that has passed through the steam cap 44 is mixed with the steam in the steam cap 44 to prevent the steam from suddenly spouting from the opening 43 of the steam cap 44. In addition, if too much water is poured into the inner pot 7 or if there is too much heat, there is a risk that hot broth will fly out of the steam boss 45, but this may be caused by mixing hot air from the hot air exhaust space 48. To prevent.

As described above, the heating of the inner pot 7 is performed by circulating the air heated by the heater 16 around the inner pot 7 in addition to the radiant heat of the heater 16 and the anti-heat of the partition plate 24. It has become. As a result, since the inner pot 7 is heated uniformly, it is possible to prevent uneven cooking of the food contained in the inner pot 7, and the partitioning plate 24 efficiently transfers the radiant heat of the heater 16 to the inner pot. By reflecting on 7, heat loss is reduced.

Further, the partition plate 24 is a reflection plate for reflecting the radiant heat of the heater 16 and a space portion as a passage for introducing air into the fan 27.
It has a function as a partition plate forming 30. Therefore, by using the partition plate 24, the rice cooker can be made compact with a low height at low cost, and the workability at the time of assembly is good.

<Effect of the device> Since the rice cooker according to the present invention has the above-described configuration, the inner pan is heated uniformly by the radiant heat of the heater and the heated air circulating along the side peripheral surface of the inner pan. It becomes possible to prevent uneven cooking of the cooked food contained in the inner pot.

Also, by mixing hot air exhausted from the steam exhaust space discharged from the steam boss, it is possible to prevent sudden steam from being ejected from the steam boss, and when too much water is put in the inner pot. When the heat is too strong, the boiling broth is prevented from jumping out of the steam boss by mixing hot air.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the rice cooker of the present invention, FIG.
FIG. 1 is a partial sectional view showing a conventional hot plate type rice cooker, and FIG. 3 is a partial sectional view showing a conventional radiation type rice cooker. In the drawing, 1: Rice cooker body, 2: Lid body, 7: Inner pot, 8: Inner case, 16: Heater, 26,29,30,31: Space part, 27: Fan, 40: Holder, 4
1: Inner lid, 42: Hot air circulation space part, 43, 46: Opening part, 44: Steam cap, 45: Steam boss, 47: Steam boss outer cylinder,
48: Hot air exhaust space part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Osamu Oyama 22-22 Nagaikecho, Abeno-ku, Osaka, Osaka Prefecture Sharp Corporation (72) Kazuo Ueda 22-22 Nagaikecho, Abeno-ku, Osaka, Osaka Within the corporation

Claims (1)

[Scope of utility model registration request] 1. A rice cooker main body and a lid body, the rice cooker main body having an inner pan for containing food to be cooked and an inner case in which the inner pan is detachably fitted. A heater is provided at the bottom of the heater, a fan is provided to blow air to the heater, and a hot air circulating space in which hot air blown from the fan and heated by the heater is circulated between the inner pot and the inner case. Forming a portion, the lid body has an inner lid that closes an upper surface opening of the inner pot, and a mounting plate that attaches the inner lid, and the lid body of the rice cooker body is provided between the inner lid and the mounting plate. A hot air circulation space part communicating with the hot air circulation space part is formed, and an opening part communicating with the space part formed by the inner lid and the inner pan is provided in the inner lid, and the inner pan is formed in the opening part. Connect one end of the steam boss that discharges the steam generated inside to the outside of the rice cooker body, and connect the other end of the steam boss A hot air exhaust space portion communicating with the hot air circulation space portion of the lid body is formed on the outer periphery of the steam boss, the hot air exhaust space portion being connected to the opening provided on the upper surface of the lid body. A rice cooker characterized in that the other end is communicated with the opening of the lid.