JPS63267311A - Rice cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rice cooker used in general households.

Conventional technology Traditionally used as an electric heater for rice cookers.

■ Aluminum cast heater made by casting a sheathed heater into aluminum.

■ Sheathed heater (for high temperature).

Two are mainly used. When using No.'s cast-in aluminum heater, a direct heating method is used where the pot and boss heater come into direct contact, and when using a sheathed heater, an indirect heating method is used where the pot and electric heater do not come into contact. The reality is that the positions of the pot and electric heater are changed depending on the electric heater being used.

However, in the direct heating method using a cast-in aluminum heater, the pot and electric heater are in contact with each other, so although the thermal efficiency is excellent, heat transfer from the electric heater to the pot mainly occurs through conduction. Depending on the degree of contact between the pot and the electric heater, or depending on the location, such as the part of the heat exchanger installed in the center of the pot or the top of the pot, an imbalance in heat transfer may occur.

There was a problem that the rice tends to be unevenly cooked and the overall taste is poor.

In addition, the cost is high because strict dimensional accuracy is required to ensure that the electric heater and pot are in close contact with each other, and if an imbalance in heat transfer occurs due to deformation or corrosion during use, uneven cooking becomes even more pronounced. There was a problem.

On the other hand, in the indirect heating method using a Km type sheathed heater (■), the heat transfer from the electric heater to the pot occurs through thermal radiation, so the part of the pot that is 1 m closer to the electric heater becomes soft and In the center part, there was a problem that the rice was cooked unevenly, such as hardness, and the flavor was poor.

To improve this, if the sheathed heater is made into a spiral shape,
The cost is high as it requires modification to improve the flatness of the heater and fixing fittings. Furthermore, since the heating area of the heater is small, the temperature of the heater itself becomes high, and the heat shielding structure of the rice cooker body also needs to be enlarged.

Therefore, in order to solve these problems, the inventor of the present invention has developed a top plate 80 in the shape of an inverted circular shape, which is made of a metal plate and has a hole 80a in the center, as shown in FIG.

A heat insulating base consisting of a spirally wound heating wire 81, a spirally wound heating wire 818, a hole "a2b" in the center, and a heat insulating material mainly composed of silica-alumina fibers. 82, a cylindrical storage case 88 that houses the heat insulating base 32 and has a bottom with a hole 88a in the center, and a hole provided in the center of each of the top plate 80 and the storage case 788. An electric heater is proposed that includes a fixing ring 84 that is inserted through and fixed to the part Boa e 33a.

Furthermore, a rice cooker using the above-mentioned electric heater is also proposed in which the pot and the electric heater are spaced apart from each other with a certain heating space. This rice cooker is structurally similar to the conventional indirect heating method using a sheathed heater, but whereas the conventional rice cooker uses line heating, it uses surface heating, which heats the pot more evenly. Can be done. As a result, the heat transfer from the electric heater is in an ideal state, and the problem of rice cooking, which has been a problem in the past, has been significantly improved, and the taste of the plate has also been improved, resulting in a significant effect on rice cooking performance.

Problems to be Solved by the Invention However, the above-mentioned rice cooker using an electric heater that has already been proposed is inferior in thermal efficiency, as is the case with the indirect heating method using a sheathed heater. ■The temperature of the rice cooker becomes high. Although it has excellent rice cooking performance, there are some problems.

In reality, the above two drawbacks have become major problems.

An object of the present invention is to solve the above-mentioned problems and provide a rice cooker that has excellent rice cooking performance, thermal efficiency, and heat insulation properties for the rice cooker body.

Means to solve problems In order to solve the above problems, the rice cooker of the present invention is provided.

A top plate made of a metal plate and a spirally wound heating wire.

It has a groove in which the heating wire is arranged in a spiral shape, and
An electric heater consisting of a heat insulating base made of a heat insulating material whose main component is γ-mina fiber, and a storage case made of a metal plate that houses this heat insulating base, an electric heater, a pot that houses food to be cooked,
A protective frame for storing the pot is provided, a heating space is provided between the protection frame and the pot, and the electric heater is installed within the heating space at a predetermined distance from the pot.

The inner side surface of the protective frame is black-treated.

Function In the above configuration, the electric heater used has a much wider heating area compared to the conventional indirect heating method using a sheathed heater, so that the pot can be heated evenly and uneven cooking can be avoided. Decreased.

Moreover, by applying black coating to the inner surface of the protective frame, heat radiation from the protective frame to the pot increases, heat transfer occurs quickly, increasing thermal efficiency and suppressing the rise in temperature of the protective frame. , the warmth of the rice cooker itself can be kept low,
It not only has excellent rice cooking performance, such as good taste and no need for cooking, but also excellent thermal efficiency and heat insulation properties.

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a partially cutaway side view of a rice cooker according to one embodiment of the present invention. In FIG. 1, the rice cooker main body l has a substantially cylindrical shape and has a bottom plate, and is open at the top. A protective frame 8 having a bottom portion is provided. The inner portion of the protective frame 8 is black-treated and provided with a black coating layer 3a. An annular upper frame 4 made of heat-resistant plastic is fitted onto the inner peripheral surface of the upper end of the rice cooker main body l, and the upper frame 4 is fitted with c? , the outer peripheral surface of the upper end of the membrane frame 3 is fitted. A pot 5 is removably housed inside the protective frame 8. The pot 5 has a flange 6 formed outward at the edge of the opening.

By placing this flange 6 on the upper surface of the upper frame 4, it is stably housed inside the protective frame 8.

An electric heater 7 is installed below the pot 5 in a heating space 8 formed between the bottom of the protective frame B and the bottom of the pot 6 at a predetermined distance 8a between the bottom of the pot 5 and the bottom of the pot 5. It is located apart from the The electric heater 7, as shown in FIG.
A top plate 7a made of stainless steel m (sUs804) and a heat insulating base 7b formed mainly of silica-alumina fibers.
, an electric FA line 7c, and a stainless steel housing case 7d that houses the heat insulating base 7b. The top plate 7a is.

It is lid-shaped and has six claws 7e bent inward on the side edge, a hole in the center, and a convex R2 groove on the whole.
Along with the 0GG spherical push.

Heat-resistant coating is applied. The heat insulating base 7b is provided with a spiral groove 7f and a hole in the center, and the heat &! 7c is provided. The storage cake 7d has a hole in the center and six square holes 7g in the side edges, with which the claws 7e engage when fitted with the top plate 7a. will be combined. Assembling the electric heater 7.

Said heating wire? c+ Insulating base 7b arranged inside groove 7f
are stored in the storage case 7d, the top plate 7a is placed over the top, the claws 7e are locked into the square holes 7g, and the fixing rings 7h are inserted through the holes in the center to integrate them. Bye. The electric heater 7 is attached to the bottom of the protection frame 8 and supported by a support member (not shown).

A heat-sensitive element 9 for detecting the end temperature of rice cooking is disposed in the center of the heating space 8 and is attached to the protection frame 8.

Further, a microswitch 11 is disposed between the bottom of the rice cooker main body l and the bottom of the protective frame a, and is turned on and off by a lever lO that is interlocked with the heat-sensitive element 9 to control energization of the electric heater 7. has been done. Further, a 1 display plate 12 is attached to the side surface of the rice cooker main body l, and a button 13 is attached to a lever lO. Also in the opening of the rice cooker body.

A lid 14 is attached so that it can be opened and closed.

Explain the operation of the rice cooker shown below. first.

Washed rice and water are stored in a pot 5, the pot 5 is stored inside a protective frame 8, and a lid 14 is closed. By pressing the button 13, the lever 10 is rotated, the heat sensitive element 9 linked to the lever 10 is operated, and the cooking state is reached, and the micro switch 11 is turned on to energize the electric heater 7. When the electric heater 7 generates heat, the air inside the sealed heating space 8 is heated, and the pot 5 is heated through this heated air. Then, the rice is cooked by heating the pot 5.

When all the water inside the pot 5 is absorbed by the rice and disappears, the bottom of the pot 5 becomes empty and the temperature rapidly rises by 1. At this time, the temperature of the heat-sensitive element 9! W also rose.

Push down the lever 1G, and the micro switch 11 is set to 171.
Then, the electricity to the electric heater 7 is stopped and the rice cooking is completed.

In the rice cooker described in Item 1, the heat generating area of the 1U air heater 7 is wider than that when using a conventional sheathed heater, and the pot 5 can be heated evenly, with less uneven cooking. In addition, since the inner surface of the protective frame 8 is black-treated and the black coating layer 8a is provided, heat radiation from the protective frame 8 to the pot 5 is increased, and heat transfer is performed quickly.
Thermal efficiency is increased, and the heat shielding property is excellent, so that the rise in temperature of the rice cooker main body 1 is suppressed, and delicious rice can be efficiently cooked.

Additionally, the thermal efficiency and temperature of the rice cooker of the example (7) were compared with those of a conventional rice cooker that was not black-treated, and the results are shown in Table 1. Thermal efficiency was evaluated by measuring the cooking time required to cook 1.8g of rice with constant power consumption.

As is clear from the results shown in Table 1, in the above example in which the inner surface of the protective frame 3 was treated with black, the rice cooking time was shortened, the thermal efficiency was increased, and the temperature of the rice cooker main body 1 was lower. It has excellent heat shielding properties.

Table 1 Effects of the Invention As described above, the cooker of the present invention has a top plate made of a metal plate, a spirally wound heating wire, and a groove in which the heating wire is arranged in a spiral shape. An electric heater consisting of a heat insulating base made of a heat insulating material whose main component is Shinocar RV Mina fiber and a storage case made of a metal plate that houses this heat insulating base is placed between the protective frame and the pot. installed at a predetermined distance from the pot inside a heating space formed in
The inside surface of the protective frame is black-treated.

The rice cooking performance is very good, as the heating chamber is heated evenly, the rice is cooked evenly, and the rice is delicious.Moreover, heat radiation from the protective frame to the pot is increased, and heat transfer is carried out quickly. ,
Thermal efficiency and heat shielding properties for the rice cooker body are also extremely excellent.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view showing a rice cooker according to an embodiment of the present invention, Figure 2 is a sectional view of the electric heater of the same rice cooker, and Figure 3 is an exploded perspective view of a conventional electric heater. be. 2... Heat insulating material, 3... Protective frame, 3a... Black coating layer, 5... Pan, 7... Electric heater, 7a...
Top plate, 7b...insulation base. 7c... Heating wire, 7d... Storage case, 7f.
...Groove, 8...Heating space part. 1st Medical S-娃7-Electric Hizl rJD Heat QP! I, Q Figure 2 7, -Electrification, Hee 7 7 Shikaku bulge 71 Shimakusen 7cm list Atsuzuka 7t & I Nu, φ6 goose 7 hole/groove

Claims (1)

[Claims] 1. A top plate made of a metal plate, a spirally wound heating wire,
It has a groove in which the heating wire is arranged in a spiral shape, and
An electric heater consisting of a heat insulating base made of a heat insulating material mainly composed of alumina fibers, a storage case made of a metal plate that houses the heat insulating base, a pot that houses the food to be cooked, and a protection housing that houses the pot. a frame, a heating space is provided between the protective frame and the pot, the electric heater is installed within the heating space at a predetermined distance from the pot, and an inner side surface of the protective frame. A rice cooker with black coating.