JPH0457337B2 - - Google Patents

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 of their small capacity, the opening area of the inner pot is small, and if a lid heater is attached, the surface of the rice will dry out while keeping it warm, resulting in dry rice, so they are generally constructed without a lid heater. It is true.

A conventional lid device of this type of rice cooker had a structure as shown in FIG. In other words, 1 is an inner pot that is detachably housed in the rice cooker body 2, 3 is an inner lid that covers the opening of the inner pot 1, 4 is an outer pot equipped with a heat-retaining heating element 5, and 6 is an inner pot of the inner pot 1. It is a steam cylinder that communicates the inside with the atmosphere via the inner pot 3, and 7 is the rice that is being kept warm. The inner lid 3 has a shape that forms a gentle slope 3a toward the outer circumference, and forms an outer circumferential end 3c via a stepped portion 3b.

Problems to be Solved by the Invention However, with such a structure, the dew that adheres to the inner lid 3 during heat retention becomes particles and flows down the slope part 3a, and drips intermittently onto the rice at the step part 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 rice 7 warm,
The heat-retaining heating element 5 provided in the outer pot 4 is ON-
Since the OFF state is repeated, the inner lid 3 is heated through the inner pot 1, and the temperature is higher than the saturated steam temperature for a certain period of time when the steam is ON, but the temperature is lower than that at other times. The saturated steam [A] starts to condense when the temperature of the inner lid 3 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 it does not completely evaporate, the outer periphery of the inner lid 3 is close to the flange 1a of the inner pot 1, When the heating element 5 is turned on, the time that the temperature of the steam is higher than the saturated steam temperature is longer than that of the inner circumference, and the amount of evaporation is also greater. It flows toward the outer periphery along the portion 3a, accumulates in the step portion 3b in a granular form, and eventually drips onto the rice 7. Subsequently, the granular dew that is generated in the same manner becomes easier to pass through the same route over and over again, so that the droplets drop onto the rice 7 at the same location, resulting in concentrated dripping.

The present invention solves these problems,
The purpose is to prevent the rice from becoming soggy due to the concentrated dripping of dew that forms on the inner lid onto the rice while keeping it warm.

Means for Solving the Problems In order to achieve the above object, the present invention includes a rice cooker main body, an outer lid that covers the upper opening of the rice cooker main body, and a rice cooker that is detachably housed inside the rice cooker main body. an inner pot, an outer pot including a heating element, and an inner lid that is in close contact with the outer peripheral edge of the flange of the inner pot and is made of a metal with excellent heat conduction; A ring-shaped protrusion is provided between the inner circumference and the outer circumference, which has an inclined surface that slopes downward from the inner circumference to the outer circumference, and further includes a ring-shaped protrusion that protrudes upward between the inner circumference and the outer circumference. The groove is configured to have a higher slope, and a plurality of holes are provided on the inner peripheral side of the groove.

Effect With this configuration, the saturated steam near the inner lid escapes into the external space of the inner wall through the plurality of holes before it partially condenses, and because it does not condense around the holes, it adheres to the inner periphery of the inner lid. The amount of dew condensed on the inner periphery other than around the hole becomes granular and flows along the slope of the inner periphery to the ring-shaped protrusion, where it condenses. It is diffused into a ring shape by the circumferential side wall of the section. At this time, since the outer peripheral part is close to the pot flange, there is a large amount of evaporation, and even if it condenses, it does not become granular. When this is repeated and the dew accumulated on the inner circumference of the protrusion exceeds the height of the protrusion, the dew flows uniformly towards the outer circumference, but since it is not granular, it easily evaporates, and as a result, the outer circumference The rice will be coated thinly and evenly, and there will be no concentrated dripping on the rice.

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 heat-retaining heating element is turned on. 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, and as a result,
The evaporation rate of the lid at the outer periphery of the inner lid also increases, and even higher effects can be expected.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 3, reference numeral 8 denotes an outer lid, and this outer lid 8 is equipped with a steam cylinder 9 for releasing steam into the atmosphere, and a hinge part 11 provided on one side of the upper part of the rice cooker main body 10. It is pivoted to the front and can be opened and closed. 12 is an outer pot equipped with a heating element 13 for cooking rice and a heating element 14 for keeping warm. 15 is a bottomed cylindrical inner pot that is detachably housed inside the rice cooker main body 10, and 16 is a pot that is supported by fitting into a protrusion 8a provided on the outer lid 8 and has excellent heat conduction. The inner cover 16 is made of metal, and the inner cover 16 includes an outer circumferential part 16a and an inner circumferential part 16b.
A ring-shaped protrusion 16c is formed that protrudes upward from the inner circumferential portion 16b, and the inner circumferential portion 16b is configured to have a higher slope than the outer circumferential portion 16a. Further, eight holes 17 are provided closer to the inner peripheral portion 16 than the protruding portion 16c. And the outer peripheral end 16 of the inner lid 16
d is placed in close contact with the flange portion 15a of the inner pot 15.

The operation of the above configuration will be explained next.

During heat retention, the saturated steam [B] near the inner lid 16 escapes from the hole 17 into the external space [C] of the inner lid 16 before being partially condensed, and does not condense around the hole 17.
The amount of dew that adheres to the inner peripheral portion 16b of the inner lid 16 is relatively reduced. Dew that has condensed on areas other than the vicinity of the hole 17 on the inner peripheral part 16b becomes particles and flows along the slope of the inner peripheral part 16b to the groove 16c, where it flows to the protruding part 16c, and the dew condenses on the inner periphery of the protruding part 16c. It is dammed up and stored by the side walls. When the accumulated dew exceeds the height of the protrusion 16c, it is dispersed in a ring shape. At this time, the outer peripheral part 16a is the pot 15
Since it is close to the flange part 15a, the amount of evaporation is large.
Even if it solidifies, it will not become granular. If this is repeated and the internal tolerance of the groove 16c is exceeded, the dew will be removed from the outer peripheral part 16.
Although it flows uniformly toward the rice 18, it evaporates easily because it is not granular, and as a result, the outer peripheral portion 16a 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 excellent heat conduction. is provided with a protrusion on the ring that protrudes upward, and the inner periphery is configured to have a higher slope than the outer periphery, and a plurality of holes are provided on the inner periphery side of the ring-shaped protrusion. This prevents the concentrated dripping of dew from the inner lid, and as a result, it is possible to reliably prevent the rice from becoming partially soggy while being kept warm.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of the inner lid of a lid device for a rice cooker showing an embodiment of the present invention, FIG. 2 is a bottom view of the inner lid, and FIG. 3 is a diagram of the lid device in 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, 13,1
4... Heating element, 15... Inner pot, 15a... Flange, 16... Inner lid, 16a... Outer periphery, 16b...
...Inner peripheral part, 16c...Ring-shaped protrusion, 16d
...Outer peripheral end, 17...hole.

Claims (1)

[Claims] 1. 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 equipped with a heating element, and the inner pot. an inner lid whose outer peripheral end is in close contact with the flange portion and which is made of a metal with excellent heat conduction; the inner lid is an inclined surface that continuously slopes downward from the inner peripheral part toward the outer peripheral part; and a ring-shaped protrusion for dispersing water droplets that protrudes upward on a continuous slope between the inner peripheral part and the outer peripheral part, and the slope of the inner peripheral part is higher than that of the outer peripheral part. configured,
A lid device for a rice cooker, characterized in that a plurality of holes are provided on the inner peripheral side of the protrusion.