JPH03297411A - Cabinet - Google Patents

Abstract

PURPOSE:To prohibit to operate a ventilator device when the ventilation is unnecessary in a process in which the duty ratio is small and the ON time is short such as in a warming time or some other precooking time, and operating the ventilator device surely in cooking, by operating the ventilator device depending on the operation signal of a delay circuit. CONSTITUTION:When the output 28 of a comparator 25 is made Low, the PUT 30 of a delay circuit 18 is ON to apply a DC voltage to a timer IC 31, the output 32 of the timer IC 31 is made High, a transistor 33 is turned ON to turn a relay 19 ON, and a ventilator device 13 is operated. When the heater current of an electric heater 7 is turned OFF in such a condition, the output 28 of the comparator 25 is made High, and thereafter, the timer IC 31 starts the timer operation. Since a variable resistor 34 is regulated to make the output 32 Low after 15 minutes from the time when the output 28 of the comparator 25 is made High, the ventilator device 13 is stopped after 15 minutes when the cooking is finished and the generation of vapor is stopped. Consequently, consumption of useless power is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cabinet that can be used to house electric heating appliances such as rice cookers.

BACKGROUND OF THE INVENTION In recent years, in order to improve the appearance of indoor rooms at home, there has been a demand for cabinets that can be used to house electric heating appliances such as rice cookers.

Conventionally, this type of cabinet was used, for example, in
The configuration described in Japanese Patent No. 37317 was common. The configuration will be explained below with reference to FIG.

As shown in the figure, the electric rice cooker 1 is housed in a cabinet (not shown), and the current flowing through the electric rice cooker 1 is detected by a current transformer 2. Current detection circuit 3
The relay 4 is operated by the current detected by the current transformer 2, the relay 4 opens and closes the circuit of the ventilation device 5, and the ventilation device 5 discharges the steam inside the cabinet. 8 amperes when cooking rice,
If there is a difference in the current during cooking and keeping warm, such as 1 ampere during keeping warm, the current during cooking is detected and the ventilation device 4
It was possible and effective to activate the current while keeping warm and not activate the current.

Problem to be Solved by the Invention In such a conventional cabinet, the current for keeping the electric rice cooker 1 or other electric heating appliance warm is equal to or close to the current for cooking at a very short duty ratio. In the case of the ON-OFF control method, there was a problem that the ventilation device 5 would operate because the detected current is the same even during heat retention.

The present invention solves the above problem, and the ventilation device does not operate when there is no need for ventilation in processes where the duty ratio is small and the ON time is short, such as during warming or pre-cooking, and the ventilation system is ensured during cooking. The purpose is to provide a cabinet in which the device operates.

Means for Solving the Problems In order to achieve the above object, the present invention provides a cabinet body, an electric heating appliance such as a rice cooker housed in the cabinet body, and a ventilation device for ventilating the inside of the cabinet body.
a current detection circuit that outputs an output when the current flowing to the electric heating appliance exceeds a certain current value; and an energization time detection circuit that outputs an operation signal when the output of the current detection circuit continues for a certain period of time t1 or more; a delay circuit that outputs an operation signal based on the operation signal of the energization time detection circuit and outputs a non-operation signal after a certain time t2 has elapsed after the energization time detection circuit outputs the non-operation signal, and the ventilation device The solution to this problem is to operate based on the circuit's operating signal.

Effect of the present invention By the above-mentioned means for solving the problem, when the electric power control for keeping an electric rice cooker or other electric heating appliance warm is a 0N-OFF control method with almost the same electric power as for cooking and a short duty ratio, the electric power is turned on. When the time is less than the fixed time t1, the energization time detection circuit does not output an operation signal, so the ventilation system can be prevented from operating during heat retention, and the ventilation system can be prevented from operating when the cooking time is less than the fixed time t2. The ventilation system can be stopped after exhausting the steam.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to FIGS. 1 to 3.

As shown in the figure, the cabinet body 6 has a door body 9 which is integrally formed with a mounting table 8 on which an electric heating appliance 7 is placed and can be opened and closed. The rail 10 is provided inside the cabinet body 6 and guides the mounting table 8 toward the front of the cabinet body 6 as shown by a two-dot chain line. An intake hole 11 is provided in the upper part of the door body 9, and an exhaust hole 12 is provided in the earthen wall of the cabinet body 6.

A ventilation system 13 is provided within the cabinet body 6, and an electric heating device 7
When in use, outside air is taken in through an intake hole 11 provided in the door body 9, and water vapor generated from inside the electric heating appliance 7 is discharged through an exhaust hole 12.

The electric heating device 7 is connected to a commercial power line 14 via a current transformer 15 that detects the current flowing therein.

The current detection circuit 16 operates and outputs an output signal when the output signal of the current transformer 15 exceeds a certain value, and the energization time detection circuit 17 operates when the output of the current detection circuit 16 continues for a certain period of time t1 seconds or more. operates and outputs an operating signal. The delay circuit 18 outputs an operation signal to operate the relay 19 based on the operation signal of the energization time detection circuit 17, starts a timer operation based on the non-operation signal of the energization time detection circuit 17, and outputs a signal to disable the relay 19 after a certain period of time t2. Output. Relay 19 is activated by the output from delay circuit 18 to operate ventilator 13 .

FIG. 3 is a specific circuit diagram of the above embodiment, and the operation will be explained with reference to this specific circuit diagram.

When a start switch (not shown) of the electric heating appliance 7 is pressed, cooking starts and the heater is energized.

When the heater current flows, a voltage is generated at the output of the current transformer 15, and if the current is larger than a certain current value,
Positive power 21 of comparator 20 of current detection circuit 16
Since the voltage becomes higher than the reference voltage 22, the output of the comparator 20 (7) becomes High. This sensing current can be adjusted by a variable resistor 24. When the output 23 of the comparator 20 becomes High and approximately 2 seconds (tl) or more elapse, the energization time detection circuit 17
The negative input 26 of the comparator 25 becomes higher than the reference voltage 27, and the output 28 of the comparator 25 becomes higher than the reference voltage 27.
Or Low Seven. Here, the energization time of about 2 seconds (tl) or more can be adjusted by the variable resistor 29.

When the output 28 of the comparator 25 becomes Low, the PUT (Programmable Unijunction Transistor) 30 of the delay circuit 18 is turned on, DC voltage is applied to the timer IC 31, and operation starts, and the output 32 of the timer IC 31 becomes High, and the transistor 33 is turned on, the relay 19 is turned on, and the ventilation device 13 is operated.

In addition, when you press the keep warm switch on the electric heating appliance 7, it enters the keeping warm state and is energized with low power, but the electric heating appliance 7 can be replaced, so depending on the item, the same heater that is energized during cooking may be energized. Low power is obtained by reducing the duty ratio. For example, 1 second O
When the current is turned on with N and OFF for 15 seconds, the current flowing through the heater is the same, so the output from the current transformer 15 is the same as during cooking, and the output from the comparator 20 is also H.
2 seconds (tl) by the variable resistor 29.
The comparator 25 is activated by the above High signal, and the output 28 is adjusted to be Low, so 1
When it is ON for seconds, the comparator 25 does not operate, the output 28 does not become Low, and the ventilation device 13 does not operate.

Next, when cooking, the output 32 of the timer IC 31 goes high.
h, and with the ventilation system 13 operating, the electric heating appliance 7
When the heater current turns OFF, the output 28 of the comparator 25 becomes High, and from that point on, the timer IC 3
1 starts the timer operation. The variable resistor 34 is adjusted so that the output 32 becomes Low 15 minutes (t2) after the output 28 of the comparator 25 becomes High, and when cooking is completed, the heater current disappears and steam is no longer generated. The ventilation device 13 stops after 15 minutes (t2) when the temperature has subsided.

Heater current is temporarily turned off during cooking due to temperature control, etc.
Even if the OFF time is less than 15 minutes (t2),
During this time, the ventilation device 13 continues to operate. These 15 minutes (
t2) can be adjusted by the variable resistor 34.

Effects of the Invention As is clear from the above-described embodiments, according to the present invention, power control during heat retention of an electric rice cooker or other electric heating appliance is 0N-OF with almost the same power as during cooking and a short duty ratio.
When the F control method is used, the energization time detection circuit does not output an operation signal when the energization time is less than a certain time t1, so the ventilation system can be prevented from operating during heat retention, and there is no unnecessary power consumption. This prevents the food being cooked from being cooled down by the air blowing, and after the cooking is finished, the ventilation system is stopped after a certain period of time t2 has elapsed.
No steam remains inside the cabinet.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram of a cabinet according to an embodiment of the present invention, Fig. 2 is a sectional view of the cabinet, Fig. 3 is a specific circuit diagram of the cabinet, and Fig. 4 is a block circuit diagram of a conventional cabinet. It is a diagram. 6... Cabinet body, 7... Electric heating appliance, 13... Ventilation system, 16... Current detection circuit, 17... Energizing time Detection circuit, 18.
...Delay circuit.

Claims (1)

[Claims] A cabinet body, an electric heating appliance such as a rice cooker housed in the cabinet body, a ventilation device that ventilates the interior of the cabinet, and a current that is output when the current flowing to the electric heating appliance exceeds a certain current value. a detection circuit;
an energization time detection circuit that outputs an operation signal when the output of the current detection circuit continues for a certain period of time t1 or more; and an energization time detection circuit that outputs an operation signal according to the operation signal of the energization time detection circuit, and the energization time detection circuit outputs a non-operation signal. After that, for a certain period of time t2
a delay circuit that outputs a non-operation signal after a period of time has elapsed, and the ventilation device is operated by the operation signal of the delay circuit.