JPH0437558Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application and overview of the invention] The present invention is a heat-retaining rice cooker, in particular, an upper device equipped with a rice cooker etc. is detachably mounted on a lower device equipped with a heating device etc. This is a rice cooker with a top and bottom separated type.In addition to the automatic keep-warm function after rice is cooked, the keep-warm operation can also be performed manually.This allows the rice to be re-warmed as needed even if it gets cold. It was made so that it could be done.

[Prior art and its problems] As shown in FIG. 5, a conventional heat-retaining rice cooker of this kind with a top and bottom separation type has a lower device 1 equipped with an appliance power plug 11 and an outlet 10, and a lower device 1 mounted on the lower device 1. and a heat insulation circuit 20 and a heat insulation power plug 2
1, etc., and the electric circuit thereof is as shown in FIG.

That is, the lower device 1 is provided with a heating device 12, a control device 14, a timer 13, etc.
The other upper device 2 is provided with a heat-retaining power plug 21 for connecting to the outlet 10 of the lower device 1, and furthermore, a heat-retaining circuit 2 is provided on the downstream side thereof.
0 is formed. The heat-retaining circuit 20 includes a first thermostat 22, a second thermostat 23, and a heat-retaining heater 24 connected in series. and the above two thermostats 22,
The operating temperatures of 23 are set to different values,
The heat retaining heater 24 only operates between these two set temperatures.
It becomes ON state.

When cooking rice, the control device 1 built into the lower device 1
4 and the heating device 12 work to cook the rice, and after the rice is cooked, the temperature inside the upper device 2 is kept constant by the heat retention circuit 20. That is, heat insulation circuit 2
The cooked rice is kept warm by opening and closing the second thermostat 23 provided at 0.

However, the conventional device described above has a problem in that the upper device 2 cannot be kept warm in some cases.

This is because the heat retention circuit 20 is controlled by the first thermostat 22, which maintains the open state under conditions in which the inside of the rice cooker is cold.

That is, the first thermostat 22, whose operating temperature is set low, is provided to prevent the rice grains from becoming half-cooked before cooking when the timer 13 is used to perform timer rice cooking. This is because the first thermostat 22 is kept open and the heat retention circuit 20 is kept OFF during the waiting time before rice cooking when the inside of the rice cooker is at a low temperature.

Therefore, if the upper device 2 is removed from the lower device 1 and left for a certain period of time during warming, and the cooked rice cools down, both the upper and lower devices 2,
Even if the first thermostat 22 is connected, the cooked rice will no longer be kept warm again due to the action of the first thermostat 22, which continues to remain in the OFF state at low temperatures.

[Technical Problem] The present invention is a vertically separated type in which the lower device 1 is provided with an electrical connector for the appliance power supply, and the upper device 2 is equipped with a heat-retaining circuit 20 that receives electricity from the lower device 1. In a heat retention type rice cooker, in order to keep the rice warm again even if it has cooled once, it is possible to manually control the power supply to the heat retention circuit 20 while still having an automatic heat retention function after rice cooking is completed. The task is to do so.

[Technical Means] The technical means of the present invention for solving the above problems will be explained using the conceptual diagram shown in FIG. In addition, the lower device 1 includes a rice cooking completion determination circuit 3, an upper device movement detection means 4 for detecting whether or not the upper device 2 and the lower device 1 are used separately, and a heat retention switch 5. , an opening/closing switch 7 for opening and closing the heat insulation circuit 20
The open/close switch 7 is closed by the OR output of the heat retention switch 5 and the rice cooking completion determination circuit 3, and is opened by the detection output of the upper device movement detection means 4. .

[Effect] The above technical means works as follows.

When rice cooking is completed and an output signal is output from the rice cooking completion determination circuit 3, regardless of the output of the heat retention switch 5 (ON/OFF state of the heat retention switch 5), the OR condition of these two outputs is satisfied, so the open/close switch 7
is closed upon receiving the OR output, and the heat-retaining circuit 20 becomes energized. In other words, the cooked rice is kept warm.

Next, in this heat-retaining state, when the upper device 2 is separated from the lower device 1 and used, the movement of the upper device 2 is detected by the upper device movement detection means 4, and the on/off switch 7 is activated. It is opened by the detection output, and the electricity supply to the heat retention circuit 20 is cut off.

Next, when the upper device 2 is reset to the lower device 1 and the heat retention switch 5 is further pressed, the heat retention switch 5
The OR condition of the outputs of and the rice-cooking completion determination circuit 3 is established, and as a result, the open/close switch 7 is closed again, so that the heat-retaining circuit 20 is re-energized (heat-retaining state).

That is, when the upper device 2 is separated from the lower device 1 and used, the heat retention circuit 20 can be turned on by turning on the heat retention switch 5 regardless of the temperature of the cooked rice, regardless of whether the temperature of the cooked rice is cold or not. becomes energized, which allows the rice to be reheated.

[Effect] Even after the power supply to the heat retention circuit 20 has stopped, the heat retention circuit 2 can be turned on by simply pressing the heat retention switch 5.
0 can be manually re-energized, so even if for some reason the cooked rice is not kept warm and gets cold, the cooked rice can be kept warm again as needed.

[Example] Next, an example of the present invention described above will be described in detail with reference to the drawings.

The external structure of the rice cooker according to the embodiment of the present invention is as described above.
The structure is similar to the conventional one shown in the figure.

The connection between the lower device 1 and the upper device 2 is constructed as shown in FIG. 3, and an on-off switch 7 is provided in the upstream circuit of the outlet 10 placed on the lower device 1 side. Further, on the upstream side of the on-off switch 7, an upper device movement detection means 4 is provided which outputs an output only when there is current in the on-off switch 7.

On the other hand, in the electric circuit of the upper device 2, there is a rice cooker 2.
The heat retention heater 24 is arranged in such a manner that it surrounds the
A heat-retaining circuit 20 is provided which includes a heat-retaining heater 25 and a top lid heater 25, and a thermostat 28 for temperature adjustment is inserted in series with the heat-retaining heater 24.

On the other hand, as shown in FIG. 2, a microcomputer (hereinafter referred to as microcomputer 17) is incorporated in the control device 14 provided in the lower device 1, and the input port of the microcomputer 17 is connected to the upper device. It comes into contact with the movement detection means 4, the power outage memory circuit 19, the heat preservation state memory circuit 80, the start switch 49, the heat preservation switch 5, the timer setting means 52, and the rice cooker 29, which are arranged in the operating section of the lower device 1. The respective outputs of the heat-sensitive elements 54 are applied. The power failure memory circuit 19 is equipped with a capacitor 51 that operates with a slight delay after power is turned on.

In addition, the output port of the microcomputer 17 has an on-off switch 7, a main solenoid valve 16 that opens and closes the gas circuit of the main burner 15, and a clear circuit 4 of the power failure memory circuit 19.
7. The ON/OFF switch 48 of the heat retention state memory circuit 80 and the clear circuit 49 of the heat retention state memory circuit 80 are connected, respectively.

Each of the above-mentioned components operates according to a program written in the microcomputer 17, and this program will be explained along with the actual use of the rice cooker according to the flowchart shown in FIG. 4.

When the power is connected, the microcomputer 17 starts operating according to the flowchart shown in FIG. 4, and first judges the state of the input port 18 to which the power failure memory circuit 19 is connected. As mentioned above, there is a slight delay in charging after the power is turned on, so
The output of the power outage memory circuit 19 is not yet applied to the input port 18, and the rice is being cooked for the first time (if the rice is not being cooked after the end of a power outage that occurred during cooking or keeping the rice warm).
If it is determined that the heat retention switch 5 is pressed, the process moves to the heat retention work, and if the heat retention switch 5 is not pressed, the start switch 49 is activated.
Waits for the button to be pressed and starts subsequent control.
(Refer to the drawing numbers 81 to 83 in the figure.) When the start switch 49 is pressed, the open/close switch 7 is opened and the electric circuit to the heat insulation circuit 20 is connected.
Set to OFF state. (Refer to the drawing number 80 part in the same figure) Following the above “”, the timer setting means 52
After reading the setting time set by the timer and setting up the timer, the rice cooking operation is completed. In this embodiment, when the set time of the timer setting means 52 is "0", normal rice cooking (rice cooking without using a timer) is performed. (Drawing numbers 84~
(See part 86) When the microcomputer 17 determines that the rice cooking operation is completed based on the output of the heat-sensitive element 54 brought into contact with the rice-cooking pot 29, the microcomputer 17 closes the open/close switch 7 and at the same time closes one of the microcomputers 17. A signal is output from output port 45 of
The OFF switch 48 is turned on, thereby charging the warming state storage circuit 80 and storing the fact that rice cooking has been completed (warming state). (See the drawing number 87 part in the same figure). The procedure in the program for determining whether or not rice cooking is completed based on the output of the heat sensitive element 54 corresponds to the rice cooking completion determination circuit 3 described above.

Next, it is determined whether or not the heat retention circuit 20 is set on the lower device 1 (whether or not there is an output from the upper device movement detection means 4), and if it is connected, the upper device 2 is By continuing to supply electricity to the heat-retaining circuit 20, the heat-retaining state is maintained, and this heat-retaining state is maintained until a stop switch (not shown) is pressed. (Refer to the drawing numbers 88 to 90 in the same figure.) Also, during the above-mentioned warming, it is always checked whether or not the warming circuit 20 is electrically connected.
When the output from the upper device movement detecting means 4 disappears and it is determined that the upper device 2 has been separated and moved from the lower device 1, the open/close switch 7 is turned off. (See drawing numbers 89 and 91 in the same figure.) When the upper device 2 is reset to the lower device 1, electricity is not supplied to the heat retention circuit 20, so if the heat retention switch 5 is pressed again, Only then, the heat retaining circuit 20 is reenergized (see portions 91 and 92 in the figure). That is, when the separated and moved upper device 2 is reset to the lower device, even if the cooked rice is cold, it can be kept warm by simply pressing the heat retention switch 5, regardless of the temperature of the cooked rice.

Finally, when the stop switch is pressed during heat retention, the power failure memory circuit 19 and the heat retention state memory circuit 80
etc. are cleared and the rice cooker is maintained in a stopped state. (Refer to drawing numbers 90 and 94 in the same figure)

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of the present invention, Fig. 2 is a circuit explanatory diagram of an embodiment of the present invention, Fig. 3 is a circuit diagram of the connecting part between the lower device 1 and the upper device 2, and Fig. 4 is the microcomputer 17.
5 and 6 are explanatory diagrams of the conventional example. In the figure, 1...lower device, 2...upper device, 3...
... Rice cooking completion judgment circuit, 4 ... Upper device movement detection means, 5 ... Heat retention switch, 7 ... Open/close switch,
20... Heat retention circuit, 23... Thermostat, 2
4... Warmth heater.

Claims (1)

[Scope of utility model registration request] The lower device 1 is provided with an electric connection for the appliance power supply, and the upper device 2 is equipped with a heat-retaining circuit 20 that receives electricity from the lower device 1. The heat retention circuit 20 is configured to turn off only when the temperature exceeds the temperature.
In addition, the lower device 1 includes a rice cooking completion determination circuit 3, an upper device movement detection means 4 for detecting whether or not the upper device 2 and the lower device 1 are used separately, and a heat retention switch 5. , heat retention circuit 20
An open/close switch 7 is provided for opening and closing, and the open/close switch 7 is closed by the OR output of the heat retention switch 5 and the rice cooking completion determination circuit 3, and conversely by the detection output of the upper device movement detection means 4. A heat-retaining rice cooker that can be opened.