JPS5917227Y2 - rice cooker - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rice cooker that adopts a double lid structure in order to improve rice cooking and heat retention characteristics, and its purpose is to prevent burning.

Generally, in this type of rice cooker, boiling over during cooking may become a problem, and therefore, various countermeasures have been conventionally taken to solve the problem of boiling over.

For example, structures have been adopted in which the space between the inner lid and the outer lid is increased, or the diameter of the steam hole of the steam outlet portion provided vertically through the outer lid is increased.

In addition to this structure, other measures have been taken, such as installing a pressure regulating valve to adjust the pressure inside the pot, or installing a special mechanism inside the steam outlet to eliminate the bubbles generated.

However, if the space between the inner and outer lids is increased, the product itself becomes larger, which not only makes the product look unsightly, but also has the disadvantage that it is heavy and difficult to move when housewives carry it around. When the diameter of the steam hole at the outlet part is increased, the heat of the rice easily escapes to the outside because the steam hole is large, and as a result, there is a drawback that delicious rice cannot be kept warm for a long time.

Furthermore, those in which a pressure regulating valve is provided or a special mechanism is provided in the steam outlet have the drawbacks of increasing the number of parts, complicating the structure, and increasing costs.

The present invention has been devised to eliminate the above-mentioned conventional drawbacks, and the present invention will be explained below based on drawings showing embodiments thereof.

In Figure 1, 1 is the rice cooker main body, and Figure 2 is the rice cooker main body 1.
This support frame 2 has an upper frame 3 at its upper end.
By attaching the upper frame 3 to the upper part of the rice cooker main body 1, it is supported within the rice cooker main body 1.

4 is a heating element fixed to the support frame 2; 5 is a pot detachably supported within the support frame 2; the bottom of this pot 5 is placed on the heating element 4.

Reference numeral 6 denotes an outer lid that closes the upper end opening of the pot 5. The outer lid 6 has a handle 7 integrally formed in its upper part and is rotatably supported by a hinge shaft 8.

Reference numeral 9 denotes a steam outlet portion provided vertically through the outer lid 6, and has a steam hole 9a provided on the upper surface.

10 is a metal plate that constitutes the lower surface of the outer cover 6;
A pan gasket 11 is fixed to the periphery of the pan 0, and this pan gasket 11 comes into contact with the upper outer peripheral edge of the pan 5 when the outer lid 6 is closed.

A connecting rod 12 is fixed to the center of the metal plate 10, and an inner cover 14 is detachably held on the connecting rod 12 via a rubber member 13 having elasticity.

Reference numeral 15 denotes a hook portion provided on the outer lid 6 on the opposite side to the hinge shaft 8. The hook portion 15 is removably held in a hook receiving portion 16 provided on the upper cover 3.

The elastic rubber member 13 is applied with a force in the direction of separating the inner cover 14 from the metal plate 10, and when the hook part 15 and the hook receiver part 16 are engaged, the inner cover 1
The opening step part 1 has the outer peripheral edge 14a of 4 at the top of the pot 5.
7 to bring them into close contact.

Further, as shown in FIG. 2, the inner lid 14 has a protrusion 18 protruding upward near the center and a liquid reservoir 19 near the outer periphery.

A plurality of steam holes 20 are provided adjacently to the protrusion 18, and as shown in FIG.
A notch 21 having a width smaller than the diameter of the hole communicates between the holes.

Further, a plurality of steam holes 22 having a smaller area than the steam holes 20 are formed in the liquid reservoir 19 .

In the above configuration, when rice is cooked, steam and bubbles generated in the pot 5 are removed because the area of the steam hole 20 provided near the protrusion 18 of the inner lid 14 is larger than that of the steam hole 22 provided near the liquid reservoir 19. Therefore, the steam mainly tries to exit from the steam vent 20.

One of the factors necessary for the growth of bubbles is a stable steam ejection velocity from the steam vents, but by making the shape of the steam vents 20 as shown in Figure 3, When bubbles pass through the circular and rectangular sections, a turbulent flow occurs, resulting in slightly different ejection speeds.

Furthermore, since the steam holes 20 have an etched portion, the bubbles are less likely to form the most stable spherical shape, so that the bubbles disappear.

Therefore, only steam and fluid Oneva come out onto the inner lid 14, and these flow into the liquid reservoir 19 provided at a low point on the outer periphery, so the steam hole 20 is always open. As a result, the steam hole 2 provided near the liquid reservoir 19
No more bubbles than 2.

Further, the oneba accumulated in the liquid reservoir 19 drips into the pot 5 from the steam hole 22 as the pressure inside the pot 5 decreases after the rice cooking is completed.

Note that if the steam hole 20 provided near the protrusion 18 of the inner lid 14 is a perfect circle, bubbles will come out onto the inner lid 14 through the steam hole 20 and elongate, and the inner lid 14 and the outer lid will be elongated. Closed space 2 with 6
3, and as the pressure inside the closed space 23 increases, a small diameter steam hole 9a formed in the steam outlet part 9
This causes the water to blow out onto the outer lid 6 and cause a boil over phenomenon.

As described above, according to the present invention, the space between the inner cover and the outer cover can be increased as in the conventional case, or the diameter of the steam hole in the steam outlet section provided vertically through the outer cover can be increased. It has great practical value, as it is possible to reliably prevent boilovers by simply slightly improving the steam hole provided in the inner lid, without increasing the size or installing a special mechanism inside the steam outlet. Moreover, it can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a rice cooker showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the main parts, and Fig. 3 is a diagram showing a steam hole provided near the center of the inner lid. be. 1...Rice cooker body, 5...Pot, 6...
...outer lid, 9...steam outlet, 14...
...Inner lid, 17...Opening step, 20...
...Steam hole, 21...Notch.

Claims (1)

[Scope of utility model registration request] A rice cooker main body, a pot removably housed within the main body, an outer lid that closes an opening at the upper end of the pot, and a steam spout provided vertically through the outer cover. an inner cover provided below the outer cover, the outer periphery of which comes into close contact with the opening step of the pot when the outer cover is closed, and a plurality of steam holes provided in close proximity to the inner cover; A rice cooker characterized in that adjacent steam holes are communicated with each other by a notch having a width smaller than the hole diameter.