JPS5836345Y2 - Heat retention type gas rice cooker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat-retaining gas rice cooker that actively heats and maintains rice using an electric heating device after cooking is completed.

JP-A-49-10916 as a heat-retaining gas rice cooker
No. 5 is known.

This has a double pot structure, with a thick hot plate installed at the bottom of the outer pot, which is heated with a gas burner, and the conductive heat from this heats the inner pot, which is inserted into the outer pot, indirectly. A heat insulating layer made from a heat insulating material is provided on the body of the outer pot, and after rice cooking is completed, the rice is heated and kept warm by an electric heating device built into the heat insulating layer.

In the conventional example of this configuration, since indirect heating is used, the advantages of gas-fired power cannot be utilized even though gas-fired power is used.

In other words, compared to electric rice cookers, gas rice cookers allow you to set the firepower to a sufficiently high level, so it is generally said that the rice cooks more deliciously and takes less time to cook.However, in the case of indirect heating, Because water is interposed between the outer and outer pots, the inside of the inner pot is heated over high heat, and the efficiency decreases due to heat transfer loss due to indirect heating, which lengthens the cooking time.

On the other hand, in the case of rice cooking with a flap structure, since the bottom of the rice cooker and the upper part thereof are also directly heated by gas firepower, the above-mentioned problems regarding the completion of cooking and the cooking time do not occur.

However, in this case, in order to obtain sufficient heating efficiency, it is necessary to expose the bottom of the rice cooker sufficiently widely to the gas heating power side, that is, to the combustion chamber side, and the heat retention effect during heat retention is reduced.

This is because the portion above the bottom of the rice cooker is exposed to the combustion chamber or exhaust chamber, that is, the cold air passage section during heat retention.

The present invention was developed in consideration of these points, and it allows rice to be cooked in a short time and achieves good results.In addition, in order to increase the heat retention effect, heat can be efficiently absorbed only from the lowest part of the rice cooker. The task is to do so.

The technical means of the present invention for solving the above problems is to support the rice cooker with a heat insulating layer on the body, expose only the bottom of the rice cooker from the heat insulating layer to the combustion chamber below the heat insulating layer, and A large number of fins are provided radially in the combustion gas contact area at the bottom of the pot, and the outer ends of these fins are made to approximate the inner diameter of the lower end of the heat insulating layer of the body.

According to the above technical means of the present invention, the combustion gas from the burner of the combustion chamber heats the bottom of the rice cooker while directly contacting the fin group, and is then exhausted.

Therefore, even if only the bottom comes into contact with combustion gas,
Almost the same heat absorption effect as when combustion gas comes into contact with the bottom and body of a rice cooker can be obtained.

This is because the fins promote the heat absorption effect.

After the rice is cooked, the rice is heated and kept warm by the heat insulating layer on the body, the heat insulating layer on the top lid, and the electric heating device built into these, but in this case, the gap around the outer circumference of the rice pot is Due to contact with the upper end or the lower end of the heat insulating layer of the body, it is blocked in the vertical direction, and no convection occurs within the gap.

In addition, since only the bottom of the rice cooker is exposed and fins are attached only to the bottom, the heat radiation area is minimized only at the bottom, and these heat radiation areas are located at the lowest level of the rice cooker. Due to the nature of heat transfer, heat loss from the rice cooker can be kept low despite the fins.

Therefore, the rice cooks well, the cooking time is short, and the heat retention efficiency is improved.

Furthermore, since the fins were provided near the maximum outer diameter of the bottom,
Demonstrates maximum heat absorption effect and further improves thermal efficiency.

Hereinafter, details of embodiments of the present invention will be explained based on the drawings.

In the figure, reference numeral 1 denotes a rice cooking pot, which is fitted into an inner shell 3 fixed in a main body case 2, and whose bottom outer periphery is supported by an annular protrusion 4 at the lower end of the inner shell. established within.

Here, there is an appropriately small gap between the inner shell 3 and the side wall of the rice cooker 1, but the lower end of the gap is closed by the protrusion 4, and the inner shell 3 has a heat insulating layer 5 attached to the outside. An electric heating device 6 is disposed in contact with the inner shell 3.

Further, an appropriate gap is provided between the outer periphery of the heat insulating layer 5 and the main body case 2 to form an annular exhaust passage 7, and the upper end thereof is connected to the rice cooker 1.
It communicates with a combustion chamber 8 formed below.

Furthermore, the bottom part 9 of the rice cooker 1 has a plurality of fins 10 and 10.
are provided radially protrudingly, and the length of these fins is appropriately set according to the diameter of the lower end protrusion 4 of the inner shell 3 so that the rice cooker 1 can stand upright in the inner shell 3 in a proper state. It has become.

Next, reference numeral 11 denotes a lid body, which is connected to the main body case 1 with a hinge structure to enable single-sided opening and closing, and a hook 12 attached to the handle is arranged on the top of the main body case 2 in the closed state. Inner lid 1 that engages with and locks the base 13, connects at the center, and rotates (opens and closes) integrally with the lid body.
4 closes the upper end opening of the rice cooker 1.

Furthermore, a heat insulating layer 15 filled with a heat insulating material is formed inside the lid, and an electric heating device 16 disposed inside the heat insulating layer and the heat insulating layer 15 is formed inside the lid.
By this means, the rice cooker 1 is kept warm from above.

In the heat-retaining gas rice cooker of the above embodiment, the rice cooking progresses by the burner 17 located below the rice cooking pot 1, and when the rice cooking is completed, the burner 17 is automatically turned on by the action of the thermal response device 19 etc. linked to the valve device 18. The fire was extinguished and the electric heating device 6
, 16 and the heat insulating layers 5, 15, the heat is actively kept.

In both the rice cooking and heat retention processes described above, ideally, in terms of rice cooking performance, it is desirable for the combustion gas to come into contact with the rice cooker pot 1 over as wide a range as possible. It is desirable to be covered as much as possible by the heat retaining layer.

Although these two problems are contradictory, in the embodiment of the present invention, only the bottom part 9 of the rice cooker 1 is made to protrude from the heat insulating layer 5, and a plurality of fins 10 and 10 are made to protrude radially from the bottom part, so that the gas Under the restrictive conditions of a rice cooker, the rice cooker 1 is covered to the maximum extent by the heat insulating layer 5, and the contact area of the combustion gas is small due to the action of the fins 10.10. Enables sufficient heat transfer,
This contributes to good cooking.

In addition, in the case of the illustrated embodiment, when fitting the rice cooker 1,
The tips of the fins 10 and 10 perform a guiding function with respect to the inner shell 3, and the rice cooker pot 1 is always reliably and accurately positioned within the inner shell 3, which prevents the fluctuation of the small gap 20 and the thermal response device 1.
9, and it is possible to achieve uniform heat retention and reliable fire extinguishing operation.

In the illustrated embodiment, the lower end of the small gap 20 is closed by the protrusion 4, but the upper end is closed by the flange 2 of the rice cooker 1.
Even if the small gap is closed by 1, heat loss due to convection from the small gap is prevented, and the same purpose of heat retention can be achieved.

As described in detail above, in the heat-retaining gas rice cooker of the present invention, a plurality of fins 10 and 10 are protruded from the bottom 9 of the rice cooker 1 and these are arranged radially, and the rice cooker is connected to the main body case 2. When the rice cooker is inserted into the inner shell 3 and fixed, the bottom part is exposed to the combustion chamber 8, and the side part of the rice cooker 1 is kept warm by the heat insulating layer 5 and electric heating device 6 attached to the inner shell 3. This makes it a heat-retaining gas rice cooker with excellent heat-retaining performance and sufficient rice-cooking efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and in the figure, 1...
...Rice pot, 2...Main case, 3...
・・Inner body, 5゜15・・・・Heat insulation layer, 6.16・・
...Electric heating device, 9...Bottom, 10°10.
...Fin, 11...Lid body.

Claims (1)

[Scope of utility model registration request] In a gas rice cooker, the rice cooker is wrapped in a cylindrical heat insulating layer provided in the body and a heat insulating layer in the upper lid, and is heated and kept warm by an electric heating device built into these heat insulating layers. The rice cooker is supported by a heat insulating layer, and only the bottom of the rice cooker is exposed from the heat insulating layer to the combustion chamber below the heat insulating layer, and a large number of fans are provided radially in the combustion gas contact area at the bottom of the rice cooker. A heat-retaining gas rice cooker in which the outer end of the fin approximates the inner diameter of the lower end of the heat-insulating layer of the body.