KR920002942Y1 - Timer with keeping warm type rice cooker - Google Patents

Abstract

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Description

Insulation cooker with timer

1 is a conceptual diagram of the present invention.

2 is an overall view of the present invention cooker.

3 is a circuit diagram of the connection of the lower device (1) and the upper device (2).

4 is a circuit explanatory diagram of an embodiment of the present invention.

5 is a program flowchart stored in the microcomputer 17. FIG.

6 is an explanatory diagram of a conventional example.

* Explanation of symbols for main parts of the drawings

1: lower device 2: upper device

3: cooking completion judgment circuit 4: start switch

5: keep warm switch 7: switch

13: timer 20: thermal insulation circuit

22: the thermostat 24: warming heater

49: upper device movement detection means

The present invention relates to a warming cooker with a timer, and after the preparation work for setting cooking conditions, the insulation circuit is temporarily turned off at the beginning of the operation of the appliance, and even if the warming switch is operated incorrectly during the preparation, the wait before cooking The rice in time does not become unripe.

Conventionally, this type of rice cooker includes, for example, an electric circuit 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., and the other upper device 2 receives electric power from the lower device 1. The heat insulation circuit 20 is formed and the heat insulation circuit 20 is comprised from the 1st thermostat 22, the 2nd thermostat 23, and the insulation heater 24 connected in series. The operating temperatures of the two thermostats 22 and 23 are set differently, and the warming heater 24 is turned ON only between these two set temperatures.

At the time of cooking, the control device 14 and the heating device 12 assembled in the lower device 1 operate to cook rice, and after the completion of cooking, the warming of the rice is made by the insulating circuit 20. That is, the temperature in the pot is kept constant by opening and closing one of the second thermostats 23 provided in the thermal insulation circuit 20.

One of the thermostats, one of which is set to have a low operating temperature, is installed to prevent rice from being uncooked before starting cooking when the timer is cooked using the timer 13. During the waiting time before the start of cooking in the state, the second thermostat 23 is maintained in the open state, and the thermal insulation circuit 20 is kept in the OFF state.

However, when the rice is cooled once by forgetting the electrical connection of the upper device 2 in the device, the first upper amostat 22, which prevents heat generation under low temperature conditions, is always left open so the upper device again It is impossible to return (2) to the warm state. Therefore, while removing the second thermostat 22 from the thermal insulation circuit 20 and at the same time equipped with a thermal switch in the lower device 1, when the thermal switch is operated unconditionally to keep the rice unheated and cooked automatically when finished cooking I can think of doing.

In this case, however, there was a problem that the rice was not cooked well when the operation was continued without knowing that the heat insulation switch was accidentally pressed during the preparation work of the timer (when setting the conditions in the timer set).

This is because the thermal insulation circuit 20 is left in the ON state during the waiting time before cooking by the misoperation of the thermal insulation switch.

In other words, when the warming switch is accidentally pressed during the preparation work of the timer cooking and the appliance operation is started afterwards, the insulation circuit 20 is left in the ON state during the waiting time before cooking and the rice in the pot is already at the start of cooking. It is unripe and contains a large amount of water. Therefore, when the cooking operation is started from this unripe state, the cooked rice sticks together in a good way, causing a qualitative deterioration.

The present invention is a thermal insulation pottery equipped with a timer equipped with a thermal insulation circuit 20 for maintaining the OFF state only when the temperature is above the set temperature and a thermal switch for opening and closing the thermal insulation circuit 20, the preparation of timer cooking In order to prevent the rice in the pot from becoming unripe during the waiting period before cooking, even if the insulation switch is operated by mistake, the insulation circuit 20 is temporarily turned off at the beginning of operation of the cooker. Let's make it a task.

When explaining the technical means of the present invention for solving the above problem using the conceptual diagram shown in FIG. 1, the start switch (4) for starting the cooking of the timer and the normal cooking without using the timer by operating at the end of the preparation work; And a cooking completion judging circuit 3, a thermal insulation switch 5, and an opening / closing switch 7 for opening and closing the thermal insulation circuit 20 so that the opening / closing switch 7 is completed with the thermal insulation switch 5 It turns on by the OR output of the determination circuit 3, and turns it off by the input of the start switch 4 on the contrary.

The technical means act as follows.

First, when the timer is set and the start switch 4 is pressed, the opening / closing switch 7 is turned off unconditionally by the input signal of the start switch 4, so that the thermal insulation circuit 20 is regardless of whether the thermal switch 5 is inserted. It becomes a non-energized state. That is, at the beginning of the operation of the rice cooker after the preparation operation, the thermal insulation circuit 20 is confirmed to be OFF.

Then, the cooking operation is performed while the timer setting time elapses. In addition, when the timer is not set (when "0" of the set time), rice heating is performed without waiting for time immediately after the heat insulation circuit 20 is turned off.

When the cooking operation is completed and there is an output from the cooking completion determination circuit 3, the output of the cooking completion determination circuit 3 and the output of the thermal insulation switch 5 are irrelevant whether or not the output of the thermal insulation switch 5 is present. Since the OR condition is satisfied, the opening / closing switch 7 is turned on by this OR output, whereby the thermal insulation circuit 20 is energized. That is to keep warm.

In addition, when only the insulation is desired, pressing the insulation switch 5 establishes an OR condition between the output of the insulation switch 5 and the output of the cooking completion determination circuit 3, regardless of whether the cooking region is before or after cooking. (7) is turned on, whereby the thermal insulation circuit 20 is energized, and the thermal insulation state of rice is ensured.

The present invention has the following unique effects.

Since the thermal insulation circuit 20 is forcibly turned off at the beginning of the operation of the cooking machine after the preparation work in the timer setting is finished, the rice in the cooking pot during the waiting time before cooking even if the insulation switch is operated by mistake during the preparation work. This is not unripe. Therefore, the cooking operation is started in the uncooked state, it is possible to prevent the sticking of the cooked rice qualitatively and to prevent the degradation of the cooked rice.

In addition, the start switch 4 is operated even at the start of normal cooking without using a timer. Therefore, the open / close switch 7 is turned off when the start switch 4 is pressed to open and close the thermal insulation circuit 20. In the case of normal cooking, the thermal insulation circuit 20 does not operate unnecessarily during the cooking, and the thermal insulation circuit 20 is after the completion of cooking, in which the warming of the rice is practically necessary (cooking completion determination circuit 3). When there is an output from the) is to operate so that there is no waste in the operation of the thermal insulation circuit (20).

Next, an embodiment of the present invention described above will be described in detail with reference to the drawings.

The overall configuration of the rice cooker according to the embodiment of the present invention consists of a lower device 1 and an upper device 2 that can be separated up and down, as shown in FIG. The setting means 52, the start switch 4, the control apparatus 14, the outlet 10, etc. are arrange | positioned, and the upper apparatus 2 mentioned later is supplied with electricity from the said outlet 10. FIG.

In addition, the lower device 1 is provided with a main burner 15 for heating the pot 29. On the other hand, the upper device (2) includes a pot 29 or a thermal insulation circuit 20 which is arranged outside the pot 29 and a thermal insulation power plug 21 for supplying electricity to the thermal insulation circuit 20, etc. It is installed.

In addition, in the thermal insulation circuit 20, as shown in FIG. 3, a thermal insulation heater 24 or an upper lid heater 25 is provided, and the thermostat 28 for temperature adjustment in series with the thermal insulation heater 24 is provided. Is inserted. The connection part of the lower apparatus 1 and the upper apparatus 2 is shown in FIG. 3, and the opening / closing switch 7 is provided in the circuit of the upstream of the outlet 10 in the lower apparatus 1 side. . On the upstream side of the on / off switch 7, an upper device movement detecting means 49 which outputs only when a current flows in the on / off switch 7 is provided.

On the other hand, as shown in FIG. 4, a microcomputer (hereinafter referred to as a microcomputer 17) is assembled in the control device 14 installed in the lower device 1, and the microcomputer 17 controls the mechanism before and after cooking. It is made to be.

In addition, the input port of the microcomputer 17 has a start switch 4, an upper device movement detecting means 49, an electrostatic suppressing circuit 19, a warm state memory circuit 80, a warming switch 5, and a timer setting means. Each output of the heat sensing element 54 attached to the 52 and the pot 29 is applied. The static electricity suppressing circuit 19 is provided with a condenser 51 which operates slightly delayed from the power supply. In addition, the input port of the microcomputer 17 has the kettle valve 16 for opening and closing the gas circuit to the main burner 15, the clear circuit 47 of the static electricity storage circuit 19, the ON state of the warm state memory circuit 80, The OFF switch 48, the clear circuit 49 of the thermal insulation state storage circuit 80, and the open / close switch 7 are connected to each other.

Each device operates according to a program stored in the microcomputer 17, but the program will be described according to the flowchart shown in FIG. When the power supply is connected, the microcomputer 17 starts to operate according to the flowchart in FIG.

(1) First, the state of the input port 18 of the static electricity suppressing circuit 19 is judged, but the capacitor 51 to which the static electricity suppressing circuit 19 is connected is stored as a slight delay from the power supply as described above. When the output of the static electricity suppressing circuit 19 is not applied to (17) and it is judged that it is the first cooking (when cooking is not done after the power failure which has occurred during cooking or keeping warm), and the thermal insulation switch 5 is pressed Next, the process proceeds to the warming operation, and when the warming switch 5 is not pressed, it waits for the start switch 4 to be pressed to start subsequent control (see reference numerals 81 to 83).

(2) When the start switch (4) is pressed next, the on / off switch (7) is turned off so that the electric circuit to the thermal insulation circuit (20) is in a non-energized state (refer to the copper conductive reference numeral (80)).

③ Next, the timer setting means 52 reads out the timer setting time, and the cooking operation is performed after the timer is set up. In this embodiment, when the setting time of the timer setting means 52 is " 0 ", normal cooking (cooking without a timer) is performed (Figs. 84-86 of the figure). See).

④ If the microcomputer 17 determines that the cooking work is completed by the output of the thermosensitive element 54 attached to the lower part of the pot 29, the microcomputer 17 turns on the opening / closing switch 7 and at the same time the microcomputer ( A signal is output from one output port 45 of 17) to turn the ON and OFF switch 48 to the ON state, whereby the warm state memory circuit 80 is stored to store the cooking completion fact (warm state). Next (refer to the reference numeral 87 in the drawing), a procedure in the program that receives the output of the heat sensing element 54 and determines whether cooking has been completed corresponds to the cooking completion determination circuit described above.

⑤ Next, it is judged whether or not the upper device 2 is set in the lower device 1 (there is no output from the upper device movement detecting means 49), and if it is set, the upper device 2 Is kept warm by energization of the thermal insulation circuit 20, and this thermal insulation state is maintained until the stop switch (not shown) is pressed (see the reference numerals 88-90 of the figure).

⑥ In addition, at the time of warming, whether the upper device 2 is set again on the lower device 1 (whether there is an output from the upper device movement detecting means 49) is always checked and When it is judged that the output from the movement detecting means 49 is removed and the upper device 2 is separated and moved from the lower device 1, the opening / closing switch 7 is turned off (reference numeral 89 of FIG. 91). Then, when the upper device 2 is reset to the lower device 1 in the state in which the open / close switch 7 is turned off, electricity is not supplied to the thermal insulation circuit 20.

Therefore, the insulation circuit 20 is energized again only when the insulation switch is pressed again (refer to the reference numerals 91 and 92 in the drawing).

⑦ Finally, when the stop switch is pressed during warming, the static electricity suppressing circuit 19, the warming state memory circuit 80, and the like are cleared and the cooker is kept in a stopped state (see the reference numerals 90 and 94 of the figure). .

Claims (1)

In the insulation tray with timer provided with the insulation circuit 20 which keeps an OFF state only when it exceeds the preset temperature, and the insulation switch 5 for opening / closing the said insulation circuit 20, it is possible to set cooking conditions, etc. A start switch 4 for starting a timer cooking or a normal cooking by operating at the end of the preparation work, a cooking completion judgment circuit 3, and an opening / closing switch 7 for opening and closing the thermal insulation circuit 20 are provided. An on / off switch with a timer, characterized in that the on / off switch (7) is turned on by the OR output of the insulation switch (5) and the cooking completion judgment circuit (3) and off by pressing the start switch (4).