JPS61290914A - Lid apparatus of rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lid device for a rice cooker used in general households.

Conventional Technology Recently, the number of people living alone, such as those working alone, students, and the elderly, has increased, and as a result, small-capacity rice cookers with a heat retention function have become popular. Because these types have a small capacity, the opening area of the inner pot is small, and if the lid heater is attached, the surface of the rice will dry out while keeping it warm, resulting in dry rice.
It is common to have a structure that does not include a lid heater.

A conventional lid device of this type of rice cooker had a structure as shown in FIG. That is, 1 is an inner pot that is detachably housed in the rice cooker main body 2, 3 is an inner lid that covers the opening of the inner a1, and 4 is an inner pot that is detachably housed in the rice cooker main body 2.
6 is a steam cylinder that communicates the inside of the inner pot 1 with the atmosphere via the inner pot 3; and 7.
is the rice being kept warm. The shape of the inner lid 3 forms a gentle slope 31L toward the outer circumference, and a stepped portion 3b.
The outer circumferential end portion 3C is formed through the outer circumferential end portion 3C.

Problems to be Solved by the Invention However, with such a structure, dew that adheres to the inner lid 3 during heat retention becomes powder and flows down the slope 3a, and is intermittently deposited on the plate at the step 3b. As a result, there was a risk that the rice 7 would become significantly soggy due to concentrated dripping.

This is due to the following reasons. That is, in the rice cooker in the heat-retaining state, the space between the inner pot 1 and the inner lid 3 is always filled with saturated steam (A). In order to keep the heat retention temperature of the rice 7 constant, the heat retention heating element 6 provided in the outer pot 4 repeatedly performs 0N-OFFi, so the inner lid 3 is warmed through the inner pot 1 and the ON state is maintained. Sometimes the temperature is higher than the saturated steam temperature for a certain period of time, but at other times it is lower than the saturated steam temperature. Saturated steam (A) is in the inner lid 3
Condensation begins when the temperature of the vapor becomes lower than the saturated steam temperature, and this is generally called dew. This dew starts to evaporate again when the temperature of the inner lid 3 becomes higher than the saturated steam temperature, but if not all of it evaporates, the outer periphery of the inner lid 3 is close to the flange 1a of the inner pot 1, heating element 6
Since the period of time when the steam temperature is higher than the saturated steam temperature is longer than that of the inner circumferential part and the amount of evaporation is larger when the is turned on, a large amount of dew remains in the inner circumferential part, and eventually it becomes granular dew and reaches the inclined part 3a of the inner lid 3. The particles flow toward the outer circumferential side along the edges, accumulate in the step portion 3b in a granular form, and eventually drip onto the rice 7. Subsequently, the granular dew that is generated in the same manner tends to pass through the same path many times, and therefore the part where it drips onto the rice 7 is also the same, resulting in concentrated dripping.

The present invention is intended to solve these problems, and aims to prevent the conspicuous softening caused by the concentrated dripping of dew on the inner lid onto the plate during heat retention.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an inner lid whose outer end is in close contact with the flange of the inner pot and which is made of a metal with excellent heat conduction. a ring-shaped groove that partitions an inner circumferential portion and projects upward; the inner circumferential portion is configured to have a higher slope than the outer circumferential portion; and a plurality of grooves are provided on the inner circumferential side of the groove It has holes.

Effect: With this configuration, saturated steam near the inner cover escapes into the external space of the inner cover through the plurality of holes before it partially condenses, and does not condense around the holes, so it adheres to the inner periphery of the inner cover. The amount of dew that forms is relatively reduced, and the dew that condenses in areas other than around the hole on the inner periphery becomes particles and flows along the slope of the inner periphery to the ring-shaped groove, where it forms in the groove. It is diffused in a ring shape inside.

At this time, the outer periphery is set close to the pot flange, so that there is a large amount of evaporation, and even if it condenses, it does not become granular. When this is repeated and the internal capacity of the groove is exceeded, the dew flows uniformly towards the outer periphery, but since it is not granular, it evaporates easily, and as a result,
The outer periphery should be wetted thinly and uniformly, and there will be no concentrated dripping onto the plate.

In addition, the better the thermal conductivity of the material of the inner lid, the longer the temperature of the inner lid exceeds the saturated steam temperature when the heating element is turned on, and the longer the temperature of the inner lid exceeds the saturated steam temperature. The better the adhesion of the outer peripheral edge and the deeper the stepped part of the inner lid, the more easily it receives the heat from the inner pot, so the same thing can be said as above.
As a result, the evaporation rate of dew on the outer periphery of the inner lid is also low, and higher effects can be expected.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 3, 8 is an outer lid, and this outer lid 8
The rice cooker is equipped with a steam cylinder 9 for releasing steam into the atmosphere, and is pivotally connected to a hinge part 11 provided on the upper side of the rice cooker main body 1o, so that it can be opened and closed. 12 is a heating element 1 for cooking rice
016 is a bottomed cylindrical inner pot that is removably housed inside the rice cooker body 10, and 16 is fitted into a protrusion 8a provided on the outer lid 8. The inner cover 16 is made of a metal with excellent thermal conductivity and is supported by fitting together.The inner cover 16 has a ring-shaped groove that partitions an outer peripheral part 16a and an inner peripheral part 16b'i and projects upward. 1
6C is formed, and the inner peripheral part 16b is the outer peripheral part 16.
The slope is configured to be higher than zL. Further, eight holes 17 are provided closer to the inner peripheral portion 16b than the groove 16c.

The outer peripheral end 16d of the inner lid 16 is placed in close contact with the flange 15a of the inner pot 15.

The operation of the above configuration will be explained next.

During heat retention, the saturated steam CB) near the inner cover 16 escapes from the hole 17 to the external space (C) of the inner cover 16 before condensing, and does not condense around the hole 17, so the inside of the inner cover 16 does not condense. Peripheral part 1
The amount of dew adhering to 6b is relatively reduced. Inner peripheral part 16
The dew that has condensed in areas other than the vicinity of the hole 17 in b becomes particulate and flows along the slope of the inner circumferential portion 16b to the groove 160, where it is diffused in a ring shape inside the groove 160. At this time, since the outer peripheral part 16& is close to the flange part 15a of the pot 15,
The amount of evaporation is large, so even if it condenses, it does not become granular. If this is repeated and the internal tolerance of the groove 160 is exceeded, the dew will be removed from the outer periphery 1.
61L, but since it is not granular, it evaporates easily, and as a result, the outer peripheral portion 161L is only thinly and uniformly wetted, and concentrated dripping onto the rice 18 does not occur.

Effects of the Invention As described above, according to the present invention, the outer end of the inner pot is in close contact with the flange portion of the inner pot, and the inner lid is made of a metal with good thermal conductivity. a ring-shaped groove that partitions the area and projects upward; the inner peripheral part is configured to have a higher slope than the outer peripheral part; and a plurality of grooves are provided on the inner peripheral side of the ring-shaped groove Since the holes are provided, it is possible to prevent concentrated dripping of dew from the inner lid, and as a result, it is possible to reliably prevent the rice from becoming locally soggy during keeping warm.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of the inner lid of a rice cooker lid device according to a second embodiment of the present invention, FIG. 2 is a bottom view of the inner lid, and FIG. 3 is a lid device according to an embodiment of the present invention. A sectional view of the adopted rice cooker, FIG. 4 is a sectional view of a conventional rice cooker. 10...Rice cooker body, 12...Outer pot,
13.14...Heating element, 16...Inner pot, 15a...Flange part, 16...Inner lid, 161L...Outer periphery Section, 16b...
Inner peripheral part, 16C...Ring-shaped groove, 16d...
...Outer peripheral end, 17...hole. Name of agent: Patent attorney Toshio Nakao and 1 other person16
---inside 1 f6 (1, -- one tato〃) sound p I7 ---com/6c Fig. 2 IO-11 Cooking Banhonban f2 ---da LfJl Fig. 4

Claims (1)

[Claims] A rice cooker main body, an outer lid covering an upper opening of the rice cooker main body, an inner pot removably housed inside the rice cooker main body, an outer pot including a heating element, and a flange of the inner pot. and an inner lid made of a metal with excellent thermal conductivity, the outer peripheral end of which is in close contact with the inner lid, and the inner lid has a ring-shaped groove that partitions the outer peripheral part and the inner peripheral part and projects upward. What is claimed is: 1. A lid device for a rice cooker, characterized in that the inner circumferential portion is configured to have a higher slope than the outer circumferential portion, and further includes a plurality of holes provided on the inner circumferential side of the groove.