JPS6326097Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lid device for a rice cooker that has an improved structure of a lid member that comes into elastic contact with an opening at the upper end of a pot.

Conventionally, for example, in a heat-retaining pot, the lid member for opening and closing the pot has an outer lid with a double-walled structure that is hollow inside to provide heat insulation, an inner lid located below the outer lid, and an outer lid side. It consists of a lid heater that is fixed to the inner lid and comes into elastic contact with the inner lid by a spring. When the lid member is closed, the outer periphery of the inner lid comes into pressure contact with the upper opening of the pot to prevent steam leakage during cooking, while when keeping the rice warm, it prevents condensation on the inner lid due to the heat generated by the lid heater and prevents water droplets. Make sure that it does not drip onto the rice.

However, since the inner lid is formed into a thin aluminum plate with thermal conductivity in mind, it is easily deformed and there is a risk of steam leaking during cooking.
Since the lid heater is in contact with the inner lid using spring force, there is a lot of heat loss due to unstable contact.
In particular, it is difficult for heat to be sufficiently transmitted to the outer peripheral edge of the inner lid away from the lid heater, so that condensation is likely to occur and water droplets are likely to drip. Furthermore, an inner cover is required in addition to an outer cover with a double-walled structure, resulting in a so-called triple-walled structure, which has the drawback of increasing the number of parts and increasing material costs.

The present invention was developed in view of the above circumstances, and its purpose is to reliably prevent steam leakage between the outer periphery of the lid member and the pot when cooking rice, and also to transfer the heat from the lid heater to the lid member when keeping the rice warm. can be efficiently conducted to
Furthermore, it is an object of the present invention to provide a lid device for a rice cooker that can reduce the number of members corresponding to the inner lid and save material costs.

An embodiment of the present invention will be described below based on the drawings. 1 is an outer case of the rice cooker, 2 is an inner case disposed within the outer case 1, and a heat insulating material 3 is interposed between both the inner and outer cases 2 and 1. Reference numeral 4 denotes a pot disposed within the inner case 2, and an annular flange portion 4a projecting horizontally outward is integrally formed at the upper end opening of the pot. 5 is the pot 4 at the inner bottom of the inner case 2.
This is an electric heater for cooking rice that is placed close to the bottom of the rice cooker.

Now, 6 is a lid member for opening and closing the pot 4, which is rotatably attached to the outer case 1 by an appropriate hinge mechanism. 8 is a ring-shaped plastic mounting frame fitted to the lower opening edge of the lid outer plate 7; 9 is a ring-shaped plastic mounting frame fitted to the lower surface of the lid outer plate 7 so as to extend to the opening edge of the mounting frame 8; A plurality of protruding boss portions (only one is shown in the figure) 10 is an inner lid plate made of a metal such as an aluminum plate which is a good thermal conductor, and is fastened to the boss portion 9 with screws 11, The portion extends outward and overlaps the inner peripheral edge of the mounting frame 8 with a slight gap. An annular lid heater 12 is attached to the upper surface of the lid inner plate 10 of the lid member 6 in a thermally conductive contact state, and a hollow portion 13 formed between the lid inner and outer plates 10 and 7 is heat-insulated. The material 14 is filled and acts as a heat insulator. Reference numeral 15 denotes a packing made of an elastic heat-resistant material, which is formed into a ring shape of silicone rubber, for example, and whose upper end is mounted so as to be held between the overlapping portion of the mounting frame 8 and the lid inner plate 10. A curled portion 15a is formed at the lower end of the pot so that it can come into elastic contact with the flange portion 4a of the pot 4. In addition, 16 is a group of through holes formed in the lid inner plate 10, 17 is a steam vent formed in the lid outer plate 7 facing the through hole group 16, and 18 is a through hole group 16 formed in the lid outer plate 7. This is a guide cylinder portion that protrudes so as to communicate between the steam outlet 17 and the steam outlet 17.

Next, the operation of the above structure will be explained. During rice cooking, the gasket 15 comes into elastic contact with the flange portion 4a and seals between these members, so that leakage of steam and cooking liquid is prevented. Furthermore, even if foreign matter such as rice remains on the flange portion 4a, the gasket 15 deforms due to its own elasticity, so a good sealing relationship between the gasket 15 and the flange portion 4a is maintained, preventing steam or cooking liquid from leaking out. Leakage is prevented. In addition, when the electric heater 5 is turned off and the rice is kept warm after cooking, the lid heater 12 generates heat and the heat is transmitted to the lid inner plate 10, but the lid heater 12 is attached to the lid inner plate 10 itself. Therefore, heat loss is small, and the entire lid inner plate 10 is heated uniformly to a high temperature. For this reason, during heat retention, the lid inner plate 10
There is no dew condensation even in a part far away from the lid heater 12, and water droplets do not drip onto the rice.

Furthermore, since the lid member 6 is composed of the inner and outer lid plates 10 and 7, a member corresponding to a conventional inner lid is not required, the number of parts can be reduced, and material costs can be saved.

As explained above, the present invention can reliably prevent leakage of steam etc. from between the outer periphery of the lid member and the pot when cooking rice, while efficiently heating the lid member and transferring it to the lid member when keeping warm. It is possible to provide a lid device for a rice cooker that can prevent partial dew condensation, and can further reduce the number of parts and contribute to saving on material costs.

[Brief explanation of the drawing]

The drawing is a vertical sectional view of only the left half of an embodiment of the present invention. In the figure, 4 is a pot, 4a is a flange, 6 is a lid member, 7 is an outer lid plate, 10 is an inner lid plate, 12 is a lid heater, 13 is a hollow part (insulation part), and 15 is a packing.

Claims (1)

[Scope of utility model registration request] A lid member for opening and closing the top opening of the pot is constructed by interconnecting an outer lid plate and an inner lid plate made of metal to which a lid heater is attached so that the inside acts as a heat insulator, and the inner lid plate A lid device for a rice cooker, comprising a gasket made of an elastic material attached to the outer periphery of the pot, which presses against a flange portion formed at the periphery of the upper opening of the pot.