JPS6052803B2 - jar rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rice cooker that can keep rice hot for a long time after cooking, and in particular improves the rice cooking characteristics by raising the internal pressure of the pot to above atmospheric pressure and cooking at a high temperature. This improves the safety and operability of the equipment.

Conventionally, boiling rice cookers and general rice cookers have a weight type or a spring type.
A pressure cooker that promotes gelatinization of starch contained in rice is known.

On the other hand, the popularity of jar rice cookers that can cook rice and keep the cooked rice warm for a long time has increased significantly in recent years.

One possible way to improve the rice cooking characteristics of this jar rice cooker is to combine it with the pressure cooking method described above, but in order to maintain the heat retention characteristics at the required level, jar rice cookers have a main body and One of the essential conditions is that the lid has a double structure that includes insulation. Therefore, if a pressure regulating valve is installed on the inner lid that directly covers the opening of the pot, the operating status of the valve cannot be visually checked during cooking, unlike in conventional pressure cookers.
It was required to use a safety device that operated without harming the user. In addition, negative pressure due to a drop in the temperature inside the pot after cooking rice,
There is a problem that negative pressure is generated when the lid is suddenly opened, causing the inner lid to fall off.Furthermore, when opening the lid during use, there is a temporary high pressure that causes the operating force to engage the lid (hereinafter referred to as locking pressure). There was a need for a solution to the problems such as the increase in the number of devices (called "j") and the deterioration of usability.

The present invention aims to solve these problems with a simple and practical configuration, and to provide a jar rice cooker that has excellent rice cooking performance through pressure cooking and is capable of keeping warm for a long time. i Hereinafter, the configuration of the present invention will be explained based on drawings showing embodiments.

Reference numeral 1 designates the main body of the device, including a cylindrical outer shell 2, an upper frame 3 that engages with the curling portion at the upper end of the outer shell 2, a protective frame 4 that engages with the upper frame 3, and a heat insulator interposed between the two. It is composed of material 5 and the like.

Reference numeral 6 denotes a pot serving as a rice cooking container, which has an arbitrary gap from the opening of the protective frame 4 and is detachable.

On the other hand, the outer lid 7 and the handle 8 are integrally molded, and a heat sink 11 with a heat insulating heater 10 is attached to the lower surface via a lid insulating material 9. A steam cylinder 12 is further attached to the heat sink 11. Penetrates through the hole. Reference numeral 13 denotes a backing made of silicone rubber, which engages with a purling portion on the outer periphery of the heat dissipation plate 11, and an annular tongue portion 14 on the periphery of the backing contacts the upper end flat portion of the upper frame 3, and connects the main body 1 and the outer lid. It is constructed so that the space created between the two and 7 can be closed.

1! is an inner lid made of an aluminum plate, and an inner lid backing 1 made of silicone rubber is attached to the curled portion of the periphery to seal the pot 6.
6 is conjugated.

The inner lid backing 16 has annular tongue portions 17 and 18 symmetrically arranged vertically.
Each of these contacts the heat dissipation plate 11 and the flange of the pot 6 with a certain amount of deflection. It is also constructed so as not to impair sealing performance. Further, the inner lid 15 is provided with a valve seat 19 made of silicone rubber for cooking rice at a constant pressure equal to or higher than atmospheric pressure, and a weight valve 20 which is detachable from the valve seat 19.

Further, a bush 21 made of silicone rubber is provided in the center, and a pin 22 screwed onto the heat sink 11 is detachably attached. A small hole 23 is provided at a high point near the center of the inner lid 15 on the opposite side where the weight valve 20 is provided, for releasing a certain amount of steam. The area of this small hole 23 is set to a size that allows steam to pass through within the range where the weight valve 20 is activated by the amount of steam generated during rice cooking. The opening/closing operation of the lid is performed by the outer lid; with the inner lid 15 attached below the knit, it is pivoted to the main body by a shaft 24 at the lower right end, and the lower end hook 26 of the operating lever 25 at the other end is attached to the main body. It is fitted into and locked into an engaging portion 27 provided on the upper frame 3.
When rice is cooked using the rice cooker having the above structure, when the rice boils, the steam that cannot be released from the small holes 23 lifts the weight valve 20, allowing rice to be cooked under constant pressure.

The steam discharged onto the inner lid 15 from both sides is separated from bubbles and the like, and is released into the outside air from the steam cylinder 12 of the outer lid 7. As is clear from the above description, the following effects can be obtained by the configuration of the present invention.

1. Rice is cooked under pressure higher than the set pressure using the weight valve and small holes provided in the inner lid, resulting in excellent rice cooking properties with a high degree of gelatinization, and no noise such as the sound of steam spouting and slight bubbles spewing out from the valve. etc. are all located in the inner abdomen and cannot be seen with the naked eye as they are covered by the outer lid.

It is hygienic and does not cause anxiety. By installing two small holes, even if a problem occurs with the weight valve, the internal pressure will not rise above the second set saturation pressure calculated by the small holes, and there will be no negative impact due to the temperature drop after cooking. The pressure phenomenon can be solved by small holes and does not particularly require a negative pressure valve.

This also alleviates the drawbacks of the inner lid coming off or the pot tending to lift due to the negative pressure generated when the lid is suddenly opened. 3. When opening the lid, the inner lid may fall due to the bending of the inner lid backing, or while steam is being generated (
When closing the lid immediately after cooking rice, etc., there was a drawback that the locking pressure to press the lock to the engaged position was increased, but this can be reduced to a practical level.

4. Although there is no direction to attach the inner lid, the small hole and the weight valve are always on the opposite side and steam comes out from both sides, so it does not concentrate at the bottom of the steam cylinder and has excellent performance against boiling over when there is a large amount of water. improves.

5. Since the small holes are located high on the inner lid, they will not be blocked by ejected bubbles, etc., and the initial effect will always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a top sectional view of a rice cooker showing an embodiment of the present invention, and FIG. 2 is a perspective view of the inner lid thereof. 1... Appliance body, 6... Pot, 7...
...Outer lid, 12...Steam cylinder, 15...Inner cover, 20...Original valve, 21...Bush, 22... Pin, 23...small hole.

Claims (1)

[Scope of Claims] 1. A jar rice cooker that has a pot attached to the appliance body, an inner lid that airtightly covers the opening of the pot, and an outer lid that covers the pot opening flange and the inner lid and is provided with an exhaust section. , the inner lid is equipped with a pressure regulating valve that controls the internal pressure of the pot during rice cooking to a constant pressure above atmospheric pressure, and an area through which steam can pass within a range in which the pressure regulating valve operates according to the amount of steam generated during rice cooking. A jar rice cooker characterized by having a small hole. 2. Claim 1, characterized in that the inner cover has an engagement device in the center that is detachable from the outer cover, and the small hole is provided within a range of 180° on the side that does not include the pressure regulating valve. Jar rice cooker as described. 3. The jar rice cooker according to claim 1, wherein the inner lid has a high part and a low part, and a small hole is provided in the high part.