JP2000070128A - Lid of rice cooking jar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dew from occurring and reduce the thickness of the lid by fixing a heat transfer plate in a part facing a metal steam discharge device on the top of a heat radiation plate. SOLUTION: Steam produced during cooking is discharged from steam holes 19 to a steam port through a steam discharge device 17, at this time oneba (sticky rice broth) contained in the steam is separated in the steam discharge device 17. When the cooker shifts into the mode of thermal insulation, a lid heater 33 is energized, and a heat radiation plate 16 is heated to prevent condensation from occurring in the underside of the heat radiation plate 16. At this time, in the parts contacting the steam discharge device 17 through packing 18, heat conduction from the lid heater 33 is slower than when the radiation plate 16 is made of aluminum. As the heat capacity, however, is large to the extent that the heat transfer plate 29 is fixed, heat gradually accumulates in those parts, preventing condensation from occurring. As the heat transfer plate 29 is thin, the thickness of the heat radiation plate 16 does not increase practically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lid for a rice cooker.

[0002]

2. Description of the Related Art In order to eliminate the problem that dew condensation water attached to the inner surface of a lid falls on cooked rice and impairs its flavor when the rice cooker is kept warm, as shown in FIG. The lid heater 3 is mounted on the upper surface of the plate 2,
Is heated at an appropriate temperature. A steam discharge device 5 is attached to a mounting hole 4 provided in the heat radiating plate 2, and the lid heater 3 is arranged in an appropriate pattern in a zigzag shape on the upper surface of the heat radiating plate 2 except for the steam discharge device 5. The tape 6 is used for fixing.

In the conventional rice cooker, since the heat radiating plate 2 is made of an aluminum material having a high thermal conductivity, the entire temperature distribution of the heat radiating plate 2 due to the heat generated by the lid heater 3 is substantially uniform, and the generation of dew is effectively prevented. Could be prevented.

[0004]

However, when the heat radiating plate 2 is formed of a stainless material having a lower thermal conductivity than aluminum material from the viewpoint of aesthetics, a portion of the heat radiating plate 2 which is in contact with the outside air and which is in contact with the steam discharging device 5 and the like. Since the temperature is hardly raised in the vicinity, the temperature difference between the steam contacting the lower surface of the portion becomes large and dew condensation occurs, and the dew condensation water drops on rice.

On the other hand, as the thickness of the lid 1 has been reduced in recent years due to the demand for space-saving rice cookers, the height of the steam discharge device 5 has been reduced, and the diameter of the steam discharge device 5 has been increased in order to secure a capacity for storing rice. Tend to be set large.

With the above configuration, the range of contact with the outside air through the steam discharge device 5 becomes relatively wide.
The temperature difference between the heat radiating plates 2 is further increased, and dew condensation easily occurs. This problem may occur even if the heat sink 2 is formed of an aluminum material having high thermal conductivity.

[0007] It is known that a heat insulating material is interposed around the steam discharge device in order to prevent the above-described dew condensation from occurring (see Japanese Patent Application Laid-Open No. 9-56579).
If it is attempted to effectively prevent the formation of dew by such means, there is a problem that the amount of the heat insulating material increases and the thickness of the lid increases.

Accordingly, the present invention provides a lid for a rice cooker that does not generate the above-described dew condensation water and makes it possible to reduce the thickness of the lid regardless of the material of the heat sink. Make it an issue.

[0009]

In order to solve the above-mentioned problems, the present invention mounts a lid heater on the upper surface of a radiator plate, and installs a vapor discharge device of the lid inside the jar body via the radiator plate. In the lid of the rice cooker which is connected, a metal heat transfer plate is fixed to a portion of the upper surface of the heat radiating plate facing the vapor discharge device.

The heat transfer plate is made of the same material as the heat radiator plate, the heat radiator plate is made of a material having relatively low thermal conductivity such as stainless steel, and the heat radiator plate is made of the same material. And a heat transfer plate fixed to the upper surface thereof with a steam passage hole,
It is possible to adopt a configuration in which the above-mentioned steam discharge device is brought into contact with the periphery of the above-mentioned steam passage hole, and a part of the lid heater is arranged on the outer periphery of the contact portion.

In order to solve the above-mentioned problem, a lid of a rice cooker is provided, in which a lid heater is mounted on an upper surface of a radiator plate and a vapor discharge device of the lid communicates with the inside of the jar body through the radiator plate. In the above, a configuration may be adopted in which the heat sink is formed of a clad material of a material having a high thermal conductivity and a material having a low thermal conductivity.

[0012]

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

FIG. 1 shows a main body 11 of a rice cooker and a hinge 1.
2 shows a state in which the lid 13 is attached so as to be freely opened and closed. Lid 1
3 has an upper lid 14, an inner lid 15 combined with the lower surface thereof, and a heat radiating plate 16 combined with the lower surface of the inner lid 15,
A steam discharge device 17 is provided at a portion of the upper lid 14 that is offset from the hinge 12.

A packing 18 is attached to the lower end of the steam discharge device 17, and the packing 18 contacts an upper surface of a heat transfer plate 29, which will be described later, provided on the radiator plate 16 (see FIG. 4A). A steam passage hole 19 penetrating through the heat radiating plate 16 and the heat transfer plate 29 is provided in the range of the contact portion. The steam passage hole 19 communicates with the inside of the pot 20 in the main body 11.

The steam discharge device 17 has a steam cap 22 provided with a steam port 21, separates the sludge from the steam that has entered together with the sleek through the steam passage hole 19, and allows only the steam to escape from the steam port 21. discharge.

As shown in FIGS. 2 (a) and 2 (b), the heat radiating plate 16 is provided with a large number of mounting claws 23 on the outer peripheral edge of a disk-shaped member made of stainless steel, and three disk-shaped members are provided on the disk portion. The vapor passage holes 19 are provided adjacent to each other. These steam passage holes 19
Is subjected to a burring process so that burrs 24 are generated from the lower surface to the upper surface.

A heat transfer gasket 26 having three holes 25 fitted around the burrs 24 of the steam passage holes 19 is interposed on the upper surface of the heat radiating plate 16.
A heat transfer plate 29 made of the same material as the heat radiating plate 16 is fixed via a double-sided pressure-sensitive adhesive sheet 28 having a hole 27 surrounding the heat transfer plate 29.

The heat transfer plate 29 is provided with the above-mentioned steam passage hole 1.
9 is formed in a disc shape having a diameter slightly larger than the contact area of the packing 18 of the steam discharge device 17 with the three holes 30 fitted into the burrs 24 of the steam discharge device 17. ). In addition, burr 2
By caulking the portion 4, the heat radiating plate 16, the heat transfer packing 26 and the heat transfer plate 29 are integrated.

Further, as shown in FIG. 3, a circular double-sided adhesive sheet 32 having a hole 31 slightly smaller in diameter than the heat transfer plate 29 is joined to the upper surfaces of the heat radiator plate 16 and the heat transfer plate 29. A lid heater 33 in the form of a cord is arranged in a zigzag pattern around the hole 31 and an aluminum foil 35 of the same diameter having a hole 34 of the same shape is joined to the upper surface thereof, and the aluminum foil 35 is covered. Ridge 3 along the shape of heater 33
6 (see FIG. 4).

As shown in FIG. 5, the heat radiating plate 16 to which the lid heater 33 is mounted as described above is
The portions 1 and 34 are aligned with the holes 37 of the inner lid 15 and are fixed to the lower surface of the inner lid 15 by the attachment claws 23. The inner lid 15 is fitted and fixed to the lower surface of the upper lid 14.

The lead wire 38 of the lid heater 33 is
It is pulled out through the rear part of the inner lid 15 to the hinge 12 of the lid.

The vapor discharge device 17 of the upper cover 14 passes through the hole 37 of the inner cover 15 and the packing 18 thereof
A steam passage reaching the steam port 21 is formed by contacting a circular portion inside the steam passage holes 19 inside the steam passage holes 19 (see FIG. 1).

The lid of the rice cooker of the embodiment is as described above, and the steam generated at the time of cooking rice is discharged from the steam passage hole 19 through the steam discharge device 17 through the steam outlet 21,
At this time, the waste mixed with the steam is separated in the steam discharge device 17.

Further, when the state is shifted to the heat retention state, the lid heater 3
3, heat is applied to the radiator plate 16 to prevent dew condensation on the lower surface of the radiator plate 16. At this time, the heat conduction from the lid heater 33 in the portion in contact with the steam discharge device 17 via the packing 18 is delayed as compared with the case where the radiator plate 16 is made of aluminum, but the heat capacity is reduced by the amount of the heat transfer plate 29 fixed. Is large, heat is gradually accumulated in that portion, and the heat prevents the occurrence of dew condensation.

In the above embodiment, both the heat radiating plate 16 and the heat transfer plate 29 are made of stainless steel, but both may be made of aluminum. By using the same material for both, the occurrence of electrolytic corrosion can be suppressed. Also, a combination of stainless steel on one side and aluminum on the other may be used, but in that case, it is necessary to take appropriate measures to suppress electrolytic corrosion.

In any of the above cases, the heat capacity is increased by the heat transfer plate 29 within the range where the packing 18 of the steam discharge device 17 contacts, and the generation of dew is prevented by the heat accumulated in that portion. be able to.

The heat radiating plate 29 may be formed of a clad material of stainless steel and aluminum, and the heat transfer plate 29 may be omitted. The addition of the stainless steel material increases the heat capacity, and thus has the same effect as the heat transfer plate 29.

[0028]

As described above, according to the present invention, the heat capacity is increased by the amount of the heat transfer plate by providing the metal heat transfer plate at the portion of the heat radiator plate facing the steam discharge device of the lid. The portion of the heat radiating plate is heated by the heat accumulated in the heat transferring plate to prevent the occurrence of dew condensation. For this reason, it is possible to prevent the dew water from falling onto the cooked rice during the heat retention. Further, since the heat transfer plate is made of a thin material, there is an advantage that the thickness of the heat sink is not substantially increased.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an embodiment.

2 (a) is a partially exploded perspective view of the same, and FIG. 2 (b) is a sectional view of the assembled state of FIG.

3 (a) is a perspective view of the heat sink, and FIG. 3 (b) is a sectional view taken along line bb in FIG. 3 (a).

FIG. 4 is an exploded perspective view of the lid.

FIG. 5 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main body 12 Hinge 13 Cover 14 Upper cover 15 Inner cover 16 Heat sink 17 Steam discharge device 18 Packing 19 Steam passage hole 20 Hook 21 Steam port 22 Steam cap 23 Mounting claw 24 Burr 25 hole 26 Heat transfer packing 27 hole 28 Double-sided adhesive sheet 29 Heat transfer plate 30 hole 31 extraction hole 32 double-sided adhesive sheet 33 lid heater 34 extraction hole 35 aluminum foil 36 ridge 37 hole 38 lead wire

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[Procedure amendment]

[Submission date] November 25, 1998 (1998.11.
25)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3 is an exploded perspective view of the heat radiating plate.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4A is a perspective view of the heat sink, and FIG. 4B is a sectional view taken along line bb in FIG.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5 is an exploded perspective view of the lid.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Fig. 6

[Correction method] Added

[Correction contents]

FIG. 6 is a partial sectional view of a conventional example.

Continued on the front page F term (reference) 4B055 AA05 BA14 BA54 CA22 CA70 CB03 CB08 CB30 CC45 DA05 DB04 FA09 FB01 FB02 FB05 FC08 FE10

Claims (5)

[Claims] 1. A lid of a rice cooker in which a lid heater is mounted on an upper surface of a radiator plate and a vapor discharge device of the lid communicates with the inside of the jar body via the radiator plate. A lid for a rice cooker, wherein a metal heat transfer plate is fixed to a portion facing the steam discharge device. 2. The rice cooker lid according to claim 1, wherein the heat transfer plate is made of the same material as the heat radiator plate. 3. The lid of a rice cooker according to claim 1, wherein said heat radiating plate is made of a material having relatively low thermal conductivity such as stainless steel. 4. A steam passage hole is provided in the heat radiating plate and the heat transfer plate fixed to the upper surface of the heat radiating plate, and the steam discharging device is brought into contact with the periphery of the steam passing hole. The lid of the rice cooker according to any one of claims 1 to 3, wherein a part of the lid heater is arranged. 5. A lid of a rice cooker in which a lid heater is mounted on an upper surface of a heat radiating plate and a vapor discharge device of the lid is connected to the inside of the jar body through the heat radiating plate. A lid for a rice cooker, wherein the lid is made of a clad material of a high material and a low material.