JPS6243461Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an electric rice cooker that connects multiple rice heaters in parallel when cooking rice to produce a large amount of heat, and connects each rice heater in series to reduce the amount of heat generated when keeping the rice warm. It is related to a heat insulator.

A conventional general electric rice cooker warmer A is as shown in FIG. As shown in the figure, the conventional one has a protective frame 3 inside a main body case 1 via a heat insulating material 2, and a circular rice cooking heater 4 is embedded in the bottom of the protective frame 3. A hot plate 5 is installed,
An inner pot 6 is placed on the hot plate 5. A non-resetting heat-responsive rice cooking switch 8 is installed in a through hole 7 formed in the center of the hot plate 5 to detect the bottom temperature of the inner pot 6. 9 is the switch 8
This is the control lever for turning ON. Next, the operation mode of the conventional electric rice cooker and heat insulator A configured as described above will be explained with reference to the circuit diagram shown in FIG. 2. First, when the rice cooking switch 8 is turned on by pushing down the operation lever 9, current flows through the rice cooking heater 4 connected in series to the rice cooking switch 8, and heating of rice starts. When the temperature of the rice in the inner pot 6 reaches a certain predetermined temperature or higher and the rice is cooked, the rice cooking switch 8 detects the bottom temperature of the pot at that time and turns OFF, and from then on, the rice cooking heater 4 and the heat retention circuit 10 are connected in series. The temperature of the rice in the inner pot 6 was maintained within a predetermined temperature range. Furthermore, the second
In the figure, 11 indicates ON/OFF of rice cooking switch 8.
12 is a rice cooking lamp, and 13 is a heat-retaining lamp.

Therefore, the conventional general electric rice cooker warmer A is
The shape is so-called vertical, which is high in the vertical direction, and since only one heater is used exclusively for cooking rice, it has the following drawbacks. In other words, it is generally important to cook rice with uniform temperature distribution, but
If the height is high in the vertical direction, temperature unevenness will occur in the rice in the vertical direction, and since there is only one heater 4 dedicated to rice cooking, temperature unevenness will occur between the rice directly above the rice cooking heater 4 and the rice further away. Therefore, it had a negative effect on the rice cooking condition.

This invention is an improvement on the conventional electric rice cooker in view of the above-mentioned drawbacks, and uses multiple rice cooker heaters.When cooking rice, multiple rice cooker heaters are connected in parallel to generate a large amount of heat. The objective is to provide an excellent electric rice cooker that can provide an average temperature distribution of rice by connecting each rice cooker heater in series and keeping the rice warm with a small amount of heat when cooking rice and keeping it warm. .

The configuration of the present invention will be described below with reference to embodiments shown in the drawings.

The electric rice cooker warmer B of the embodiment shown in FIG. 3 has a shape with a wide bottom area that is not very high in the vertical direction. Inside the main body case 14, a protective frame 16 is installed with a heat insulating material 15 in between, similar to the conventional electric rice cooker warmer A shown in FIG. 1, and a disk-shaped heating plate 17 is installed on the protective frame 16. has been done. 18 is an inner pot placed on the hot plate 17, and 19 is installed in a through hole 20 drilled in the center of the hot plate 17, and turns off by detecting the temperature of the bottom 18a of the inner pot 18. Non-resetting type heat-responsive rice cooking switch, 21 is rice cooking switch 1
It is a push button type or proximity type operation switch that turns ON the switch 9. In the case of this embodiment, two annular rice cooking heaters 22 and 23 are embedded within the hot plate 17.

Figure 4 is a block circuit diagram of the electric rice cooker warmer B configured as described above.
A rice cooking circuit 26 is constructed by connecting the rice cooking switch 19 and a rice cooking heater circuit 25 in parallel through a switch 24 having multiple contacts interlocking with the rice cooking switch 19. 2
A temperature-sensitive switch 27 is connected in parallel to the switch 6 through a switch 24 having multiple contacts. The specific electric circuit is shown in FIG. The switch 24 having multiple contacts is a three-terminal two-contact type having terminals a, b, and c, and when the rice cooker switch 19 is OFF, short-circuits between the terminals a and b as shown in the figure.
When ON, terminals a and c are short-circuited. still,
28 is a lid heater to which power supply voltage is always supplied regardless of whether the rice cooking switch 19 is ON or OFF.

Next, the operation mode of the rice cooker warmer B according to the embodiment constructed as described above will be explained with reference to FIGS. 3 to 5.

First, the operation switch 21, part of which is exposed to the outside of the main body case 14, is operated to turn on the rice cooking switch 1.
When the switch 19 is turned on, the switch 24 having multiple contacts linked to the switch 19 is switched, and the terminals a and c are short-circuited. As a result, current flows through the rice cooking heater circuit 25, which connects the rice cooking heaters 22 and 23 in parallel, via the switch 24, and rice cooking heating is started.
Since the heaters 22 and 23 are connected in parallel, a power supply voltage is supplied to each of them, and a heat output large enough for cooking rice can be obtained.
7, embedded in an annular shape at appropriate intervals,
Moreover, the height of the rice cooker warmer B in the vertical direction is considerably lower than that of the conventional rice cooker warmer.
23 are arranged concentrically, so that the inner pot 18
The temperature distribution given to the rice by the heaters 22, 23 is almost uniform, so that the rice can be cooked evenly. Furthermore, compared to the conventional case where there is only one rice cooking heater, the heat generation amount of each of the heaters 22, 23 is smaller, so that the heaters 22,
It is also possible to extend the life of 23.

When the temperature of the rice reaches the finished cooking temperature, the temperature of the pot bottom 18a at this time is set to the rice cooking switch 1.
9 senses and turns OFF. Therefore, the switch 24 having multiple contacts is switched so that the terminals a and b are short-circuited, and the rice cooking heater circuit 25 has the heaters 22 and 23 connected in series.
A series circuit is formed through temperature sensitive switch 27. Therefore, the power supply voltage divided by the resistance of the heaters 22, 23 is applied to each rice cooking heater 22, 23, and the amount of heat generated by each heater 22, 23 is significantly reduced. That is, the lid heater 28
The calorific value of the rice becomes the calorific value suitable for keeping the rice warm.From then on, the temperature-sensitive switch 27 senses the temperature of the rice,
This is a warming process in which it repeatedly turns on and off to keep the rice at an appropriate temperature.

In this way, the electric rice cooker warmer B of this embodiment
The key technology is to install multiple rice cooker heaters and use them in parallel or in series to control the temperature distribution on the rice when heating rice and when heating the rice to keep it warm. The goal is to eliminate variation. As a result, the inner pot 18
It is also possible to change the shape of the electric rice cooker by increasing its base area and decreasing its height in the vertical direction. Generally speaking, lowering the vertical height of an electric rice cooker will eliminate variations in the temperature distribution given to the rice in the vertical direction.
It is said that delicious rice can be obtained, and this example also provides good results in this respect. In addition, since the electric rice cooker B is relatively low in the vertical direction as mentioned above, in the normal electric rice cooker A, the side heater (in addition, the (not shown in FIG. 1) can also be removed, and costs can be reduced accordingly.

As explained above, the present invention includes a rice cooking circuit in which the rice cooking switch is connected in series with a plurality of rice cooking heaters connected in parallel via a switch having multiple contacts that open and close in conjunction with the rice cooking switch; It consists of a temperature-sensitive switch connected in parallel to the rice-cooking circuit via the switch having multiple contacts, so that when the rice-cooking switch is ON, each rice-cooking heater is connected in parallel, and when the rice-cooking switch is OFF, each rice-cooking heater is connected in series. Because of this, it is possible to provide an electric rice cooker and warmer that has a plurality of rice cooker heaters, so when cooking rice, it is possible to reduce the difference in the heating temperature distribution given to the rice by the plurality of rice cooker heaters. You can cook rice with less unevenness. Therefore, if the capacity is the same, it is also possible to expand the bottom area of the inner pot and lower its height. In this case, the lowered height will increase the heating temperature in the vertical direction of the rice. Variations in distribution can also be reduced. In addition, since multiple rice cooker heaters are connected in series when keeping warm, each rice cooker heater can also be used for keeping warm, and side heaters dedicated to keeping warm can be omitted. Since the heat can be maintained in a uniform manner, the distribution difference in the heat retention temperature can be reduced, and the unevenness in heat retention can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main parts showing the whole of a conventional electric rice cooker and warmer, Fig. 2 is its circuit diagram, and Fig. 3 is a longitudinal sectional view of the main parts showing the whole of the electric rice cooker and warmer according to the present invention. , Figure 4 is a block diagram of the electric circuit, Figure 5
The figure is an electrical circuit diagram. 19...Rice cooking switch, 24...Switch having multiple contacts, 22, 23...Rice cooking heater, 29...
...Rice cooking circuit, 27...Temperature-sensitive switch.

Claims (1)

[Scope of utility model registration request] A rice cooking circuit comprising a plurality of rice cooking heaters connected in parallel to the rice cooking switch via a switch having multiple contacts that open and close in conjunction with a rice cooking switch, and the rice cooking circuit having the multiple contacts. The rice cooker comprises temperature-sensitive switches connected in parallel via a switch, and when the rice cooker switch is ON, each rice cooker heater is connected in parallel, and when the rice cooker switch is OFF, each rice cooker heater is connected in series. Cooking rice warmer.