JPS6023607B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device such as a rice cooker or an electronic jar rice cooker that has an airtight seal so that the internal pressure of the pot can be increased when cooking rice. It is an object of the present invention to provide a cooking appliance in which the appliance is not damaged even if the internal pressure decreases, and the lid can be easily opened and closed.

Conventionally, in this type of cooker, in order to improve cooking and heat retention characteristics, an inner cover that covers the upper opening flange of the pot placed on top of the heating element is detachably provided below the outer cover. In many cases, in order to further increase the internal pressure, a packing with a sealing effect is engaged with the green part around the inner cover, and the structure is such that the steam discharge from the inner cover is restricted. When the outer lid is opened in the above-mentioned slow-rise process, the inner space of the pot is expanded, a temporary negative pressure phenomenon occurs, and the inner lid, which should be opened at the same time, separates from the outer lid. On the other hand, after the rice is cooked, the heat supply disappears and the heat dissipates.
A negative pressure phenomenon inevitably occurs within the pot. When this heat dissipation is rapid (at low temperatures or when water is poured on it), the inner lid deforms due to negative pressure, taking into account the fact that steam discharge is restricted, and from then on, the inner lid deforms due to negative pressure.
There was a risk that the performance that should originally be provided would be impaired. In the former case, a countermeasure is to strengthen the engagement force between the inner cover and the outer cover, but if the engagement force is too strong, attachment and detachment operations such as cleaning will become difficult. Moreover, this is not a solution to the latter problem. Furthermore, if the steam exhaust section is enlarged, it becomes impossible to increase the internal pressure, which is the original purpose.

Another problem is that depending on the degree of rice washing and the amount of water used for cooking rice, sticky residue may accumulate in the inner lid, so it is necessary to provide a return hole at the bottom of the inner lid. It was difficult for the sticky liquid to return to the inside of the pot, and when rice was being cooked, sticky liquid spouted out from the hole, causing problems such as sticky sticky liquid leaking out of the steam cylinder of the outer lid.

The present invention solves the above-mentioned conventional drawbacks, and a heat-retaining rice cooker as an embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, reference numeral 1 denotes a main body of the device, which is composed of a cylindrical outer shell 2, a protective frame 3, and a heat insulating material 4 interposed between both 2 and 3.

Reference numeral 5 denotes a pot housed in the main body 1, which is detachably attached to a heating element (not shown) for cooking rice at the bottom of the main body 1.

Reference numeral 6 denotes an outer rhombus that covers the upper surface of the main body 1, and is rotatably supported by a shaft 7 on the upper part of one side of the main body 1, and can be engaged with the upper part of the other side of the main body 1 with a hook lever 8.

A handle 9 is integrally molded on the upper surface of the outer lid 6.

The outer lid 6 has a lower surface made of a metal heat sink 10 and has a lid heat insulating material 11 inside. Reference numeral 12 designates a heat-retaining lid heating element fixed to the upper surface of the heat sink 10, and 13 designates a steam cylinder installed through the outer lid 6.

14 is a pin fixed to the center of the heat sink 10 so as to protrude downward, and 15 is an inner lid made of an aluminum plate that covers the upper surface of the pot 5.

The inner lid 15 has a silicone rubber bush 16 on the pin 14.
It is removably attached via this push 1
Due to the elasticity of 6, the packing 17 attached to the peripheral edge of the inner lid 15 is pressed against the upper flange of the pot 5, thereby closing the opening □ on the top surface of the pot 5. Numeral 18 is a silicone rubber valve seat fixed to the lowest flat surface of the inner lid 15, and 19 is a weight valve. The valve seat 18 and weight valve 19 constitute a pressure regulating valve.

Note that the configuration in which the valve seat 18 is attached to the inner cover 15 is
The inner cover 15 is placed between the upper flange 20 and the lower flange 21 of
is inserted, the lower flange 21 is made larger than the upper flange 20, and the through hole 22 formed in the inner lid 15 is closed from below by the lower flange 21. The lower flange 21 may have a wall thickness of, for example, two ribs or less so as to have flexibility. This lower flange 2
1 changes depending on the pot pressure. That is, when the internal pressure of the pot is lower than the first predetermined pressure, the pot deforms downward as shown in FIG. The pressure inside the pot increases and approaches atmospheric pressure. Further, when the internal pressure of the pan is higher than the second predetermined pressure which is higher than the first predetermined pressure, the tip of the lower flange 21 penetrates the through hole 22 and protrudes upward, as shown in FIG. is partially opened and the gas inside the pot is released onto the inner lid 15 through the through hole 22, and the pressure inside the pot is reduced. In addition,
When the internal pressure of the pot is higher than the first predetermined pressure and lower than the second predetermined pressure, the lower flange 21 opens into the through hole 22 as shown in FIG.
occlude from below.

In the above configuration, during normal rice cooking, the internal pressure of the pot becomes higher than the pressure above the inner lid 15, that is, atmospheric pressure due to heating, and the through hole 22 of the inner lid 15 is closed from below by the lower flange 21 of the valve seat 18, and the inner pressure of the pot increases. further rises, and thereafter is kept at a constant pressure by the weight valve 19. Further, since the ejected material ejected from the weight valve 19 is not ejected upward, the viscous material among the ejected material is not discharged from the steam cylinder 13 to the outside of the vessel. Furthermore, if the weight valve 19 does not operate due to a malfunction and the internal pressure of the pan further increases to exceed the second predetermined pressure mentioned above, the tip of the lower flange 21 penetrates the through hole 22 and protrudes upward. Part of the pot is opened and the pressure inside the pot is reduced, so there is no danger. Also, after the rice is cooked, the pressure inside the pot should be the first level.
When the pressure drops below a predetermined pressure, the lower flange 21 bends downward, air flows into the pot, and the inner pressure of the pot is maintained at atmospheric pressure, so that the inner ring 15 can be easily opened together with the outer lid 6. Note that instead of the lower flange 21, as shown in FIG. 5, the lower part of the bush 16 is extended to form a lower flange 6a, and a through hole 22a is provided in the inner lid 15 at a position covered by the lower flange 6. A similar effect can be expected. As is clear from the above explanation, the elastic member such as the lower flange and the through hole in the inner lid prevent abnormal increases in the internal pressure of the pot, and even if the internal pressure of the pot decreases, the inner cover can be opened easily. The industrial value is great.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the top of a heat-retaining rice cooker according to an embodiment of the present invention, Fig. 2 is a perspective view of the main parts of the inner lid, and Figs. 3, 4, and 5 show the operation of the main parts. A cross-sectional view for explanation,
FIG. 6 is a sectional view of a similar part in another embodiment of the present invention. 5...Nabe, 15...Uchibishi, 16...Fush...
16a... Lower flange, 17... Packing, 18... Valve seat, 19... Bell valve, 21...
...Lower flange, 22, 22a...Through hole. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1 A cylindrical pot with a bottom, a lid that covers the top opening of the pot,
A sealed space is formed in the pot and the packing interposed between the pot and the lid, a through hole is provided in the lid, and an elastic member is attached to cover the through hole from the inside, and this elastic member is arranged so that the internal pressure of the pan reaches the maximum level. When the pressure within the pan is lower than the first predetermined pressure, the pot is separated from the lid and opens the through hole, and when the internal pressure of the pan is higher than the second predetermined pressure, which is higher than the first predetermined pressure, the pan is deformed and inserted into the through hole. A cooking appliance characterized in that the lid is opened and the through hole is closed when the pot internal pressure is above the first predetermined pressure and below the second predetermined pressure.