JPS591603Y2 - rice cooker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rice cooker in which an inner pot is housed within an outer pot equipped with a rice cooking heater.

Conventionally, in this type of rice cooker, the inner lid was in pressure contact with the top surface of the inner pot in which the rice was placed, and the inner lid was provided with a steam hole through which the steam generated during cooking was released. It has become.

However, in order to cook rice deliciously and efficiently, it is generally believed that it is better to use pressure cooking by increasing the internal pressure of the inner pot, like in a pressure cooker. If a rice cooker is equipped with a steam vent, the internal pressure of the inner pot will hardly rise, making it impossible to perform pressure cooking.

This invention was developed in view of this point, and uses pressure cooking to cook rice deliciously and efficiently.
Another object of the present invention is to provide a rice cooker that can adjust the internal pressure of the inner pot during rice cooking.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

Figure 1 shows an electronic rice cooker, which is an example of a rice cooker.
2 is an outer pot fixed inside the main body 1, 3 is a heat-retaining heater attached to the outer circumferential surface of the outer pot 2, and 4 is a ring-shaped rice cooking pot fixed to the bottom of the outer pot 2. A heating plate 6 has a heater 5 embedded therein, a temperature sensor 6 is provided in the center of the heating plate 4, and an inner pot 7 is housed within the outer pot 2 so that its bottom surface is in contact with the heating plate 4.

Reference numeral 8 denotes an outer cover provided to the main body 1 so that it can be opened and closed; 9 is a handle; a heat sink 10 is fixed to the lower surface of the outer cover 8; a space between the outer cover 8 and the heat sink 10 is provided with a handle; A heat insulating material 11 is filled.

In the center of the heat sink 10, an inner lid fixture 12 having a boss portion 12a at the lower end is vertically installed, and the upper end of the inner lid fixture 12 is fixed to the heat sink 10 with a nut 13. .

A ventilation passage 12b having a predetermined length l is provided on the outer peripheral surface of the inner lid fitting 12 from the lower end boss portion 12a upward.

The inner lid fitting 12 has a mounting bush 1 made of rubber material.
4 (Fig. 3.

(see FIG. 4) is forcibly fitted into the mounting bush 14, and an inner cover 20 is airtightly mounted around this mounting bush 14.

A thick sliding part 15 is provided at the lower part of the mounting bush 14, and the central hole 15a of this sliding part 15 is connected to the inner lid fitting 1.
2, and the wall thickness t of the sliding portion 15 is slightly shorter than the length l of the air passage 12b.

A bowl-shaped inner shell part 16 and an outer shell part 17 are integrally provided on the upper part of the mounting bush 14. The inner shell part 16 is shorter than the outer shell part 17, and the sliding part 15 of the mounting bush 14 is used for mounting the inner lid. When located at the lower end of the tool 12 (when the outer cover is opened), only the outer shell 17 comes into pressure contact with the heat sink 10 to maintain the stability of the inner cover 20.

At this time, since the elastic force of the outer shell part 17 is not so large, the mounting bush 14 is attached to the boss part 12 of the inner lid fixture 12.
There is no chance of dropping from a.

When the sliding part 15 is pushed up to the top of the inner lid fixture 12 (when the outer lid is closed), the inner part 16 as well as the outer part 17 comes into pressure contact with the heat sink 10, causing the inner lid 20 to have a large downward force. Applying pressure.

Further, an appropriate number of steam venting notches 18 are provided at the tips of the inner shell part 16 and the outer shell part 17, and the sliding part 15 of the mounting bushing 14 has several pressure regulating holes 19 communicating with each other vertically. is provided.

A packing 21 is attached to the outer peripheral end of the inner lid 20,
This packing 21 is pressed against the upper surface of the inner bear to seal the inside of the inner bear.

A slide plate 22 is inserted through the inner lid fitting 12 so as to be vertically movable, and a pressure regulating spring 23 is provided between the slide plate 22 and the heat sink 10.

The slide plate 22 is always urged downward by a pressure regulating spring 23, and closes the pressure regulating hole 19 at a predetermined pressure to form a pressure regulating valve.

The operation of the rice cooker having the above configuration will be explained.

First, when the outer cover 8 is closed, the gasket 21 at the outer peripheral end of the inner cover 20 is in pressure contact with the upper surface of the inner bear, so the mounting bush 14 is pushed upward by the reaction force. Both the inner shell part 16 and the outer shell part 17 of 14 are in pressure contact with the heat sink 10, and the inner cover fitting 12
The upper end of the ventilation passage 12b is the sliding part 15 of the mounting bush 14.
The inside and outside of the inner lid 20 are not in communication with each other (see FIG. 2).

When the rice cooking heater 5 is energized in this state, rice is efficiently cooked because the inside of the rice cooker is not sealed.

When the steam pressure in the inner bear rises to a predetermined pressure or higher on the way, the slide plate 22 moves slightly upward against the pressure regulating spring 23 due to the steam pressure, and the steam in the inner bear flows through the pressure regulating hole 19. from the mounting bush 14 through the notch 18 into the space between the heat sink 10 and the inner cover 20, and further into the outer cover 8.
It is exhausted to the outside from a steam port (not shown) provided in the .

Therefore, there is no fear that the vapor pressure within the inner vessel will rise excessively.

If the cooked rice inside the inner bear is left for a long time, the inside of the inner bear will naturally cool down, and as the temperature drops, the pressure inside the inner bear will become negative.

Due to this negative pressure, the gasket 21 at the outer peripheral end of the inner lid 20 comes into close contact with the upper surface of the inner bear, and the slide plate 22 comes into close contact with the upper surface of the mounting bush 14 to seal the pressure regulating hole 19.
0 does not easily deviate from the inner bear.

However, when the outer cover 8 is opened in this state, the inner cover fitting 12
moves upward together with the heat sink 10, while the mounting push 14 moves downward relative to the inner lid fitting 12.

As shown in FIG. 5, the sliding part 15 of the mounting bush 14 is located in the middle of the ventilation passage 12b of the inner lid mount 12, and the inside and outside of the inner lid 20 are communicated via the ventilation passage 12b. , outside air instantly enters the inner chamber from the ventilation path 12b.

Therefore, the negative pressure inside the inner bear is eliminated, and the outer cover 8 and the inner cover 20 can be opened easily.

In the above embodiment, the inner and outer parts 16 and 17 are integrally provided on the mounting bushing 14 to stabilize the inner cover 20 and apply pressure to the inner cover 20. 17 may be replaced with a pressure spring that urges the inner lid 20 downward.

However, if the inner and outer parts 16 and 17 are provided integrally with the mounting bush 14, assembly is easy without increasing the number of parts, and it also has the dual functions of preventing rattling of the inner cover 20 and applying pressure. , extremely convenient.

As is clear from the above explanation, according to the present invention, the inner lid is brought into airtight pressure contact with the top surface of the inner pot, thereby sealing the inside of the inner pot and enabling pressure cooking to cook rice deliciously and efficiently. be able to.

In addition, a pressure regulating hole is provided in the mounting bush that airtightly attaches the inner lid to the bottom surface of the outer lid, and the pressure regulating hole, pressure regulating spring, and slide plate constitute a pressure regulating valve, so that the inner lid can be airtight when cooking rice. By adjusting the internal pressure of the pot to a constant level, you can always get consistently cooked rice.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of an electronic rice cooker which is an example of a rice cooker according to the present invention, Fig. 2 is a detailed view of part A in Fig. 1, and Fig. 3 is a detailed view of part A of Fig. 1.
4 are a plan view and a half-sectional front view of the mounting bush, and FIG. 5 is a detailed view of section A in FIG. 1 with the outer cover open. 1... Body, 2... Outer pot, 7...
...Inner pot, 8.Curved outer lid, 12.....Inner lid mount, 14.....Mounting bushing, 16.....
・Inner shell part, 17... Outer shell part, 19...
Pressure adjustment hole, 20... Inner cover, 21... Gasket, 22... Slide plate, 23...
Pressure adjustment spring.

Claims (2)

[Scope of utility model registration request] (1) An inner lid fitting is installed vertically at approximately the center of the lower surface of the outer lid that can be opened and closed with respect to the main body of the rice cooker, and an inner lid that is airtightly pressed against the upper surface of the inner pot is attached to the inner lid fitting. It is slidably mounted via a mounting bush, and the mounting bush is provided with a pressure regulating hole that communicates between the inside and outside of the inner cover, while the inner cover fixture is provided with a pressure regulating hole that is movable between the lower surface of the outer cover and the upper surface of the mounting bush. A rice cooker characterized in that the inner lid fitting is provided with a pressure regulating spring that inserts a slide plate and biases the slide plate in a direction that presses the slide plate onto a pressure regulating hole of a mounting bush. (2) A bowl-shaped outer part that is always in pressure contact with the lower surface of the outer cover and an inner part that is in pressure contact with the lower surface of the outer cover only when the outer cover is closed are integrally provided on the upper part of the mounting bush. A rice cooker according to claim 1 of the utility model registration claim.