JPH0523153Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to electric heating equipment such as a jar pot.

(b) Prior Art In recent years, electric heating devices such as electric jar pots have been designed to prevent the main body from falling over due to a hand or foot caught on the power cord, as shown in Japanese Utility Model Publication No. 12024/1983, for example. A magnetic type plug is used to prevent this. However, this magnetic type plug can come off by applying a small amount of force to the power cord or the plug itself, so it may come off without the user knowing, and even if you think you have boiled water, it may come off. There were times when there was no such thing.

In order to solve such problems, for example,
Publication No. 60-123122 discloses a reed switch that opens and closes in response to the attachment and detachment of a magnetic plug, a secondary battery, and a buzzer. When the magnetic plug is removed, the reed switch closes and the secondary battery and buzzer are connected. It has been proposed that a buzzer will sound to notify that the plug has been removed.

However, in the above configuration, when the magnetic plug is connected, the reed switch is held open, and in this state, the power supply may be interrupted if the power cord is accidentally unplugged from the outlet or a power outage occurs. Even if the heating of the device stopped, the buzzer did not sound, so the user could not be informed that the heating of the device was interrupted.

(c) Problems that the invention aims to solve This invention takes into account the above points, and solves the problem not only when the plug is removed while the device is in operation, but also when the power cord is accidentally unplugged from the outlet or when a power outage occurs. The purpose of this invention is to reliably notify the user of the status using a buzzer.

(d) Means for solving the problems The heating device of the present invention includes a heating device main body that has a bottomed cylindrical container and a heater that heats the container;
A magnetic plug detachably connected to the main body includes a backup circuit, a buzzer, and detects whether or not power is being applied to the main body, and when the application of power is stopped, the backup circuit The device includes a control circuit that operates the buzzer by discharging the buzzer.

(E) Effect Since the present invention is constructed as described above, it will not only be possible to prevent the magnetic plug from coming off during the heating operation of the device, but also to prevent damage if the power cord is accidentally unplugged from the outlet or a power outage occurs. When the power supply to the device is stopped due to this and the heating operation is interrupted, the control circuit detects this condition, discharges the backup circuit, and activates the buzzer to notify the user that the heating has stopped. .

(f) Embodiments Examples of the present invention will be described based on the drawings. FIG. 1 is a side partial sectional view of the electric jar pot of the present invention, in which numeral 1 indicates the jar pot body, which will be described in detail below.

1' is a cylindrical outer frame, and 2 is a bottomed cylindrical container housed within the outer frame for storing water.
3 is a heater wrapped around the lower outer circumference of the container 2;
Reference numeral 4 denotes an air supply pipe that is connected to a pump (not shown) and pumps air into the container 2, and 5 is a hot water supply pipe that has one end connected to the bottom wall of the container 2 and the other end facing the outside of the outer frame 1'. When air is forced into the container 2 through the air supply pipe 4, the water in the container 2 is led out. Reference numeral 6 denotes a plug receiver provided at the lower part of the outer frame 1'.

7 is a lid that closes the upper opening of the jar pot body 1, and 8 is a magnetic plug that is detachably attached to the plug receiver 6.

Fig. 2 is an electric circuit diagram of the electric jackpot of the present invention, in which 10 is an AC power supply, 11 is a thermostat connected in series to the heater 3, 12 is a capacitor forming a backup circuit, and 13 is for controlling the discharge of the capacitor. In the control circuit, the diode 14,
15, Zener diode 16, resistor 17, 18,
19, smoothing capacitor 20 and transistor 2
Consists of 1. 22 is a buzzer.

Next, the operation in the above configuration will be explained.
First, when the magnetic plug 8 is attached to the plug receiver 6 and the heater 3 is energized to start boiling water, the diode 14, resistor 17, capacitor 20
Since a constant voltage from the Zener diode 16 is applied to the capacitor 12 via the diode 15, the capacitor 12 is charged. Further, since the constant voltage is applied to the base of the transistor 21 via the resistor 19, the transistor 21 is turned off and the buzzer 22 is not energized.

Next, when the magnetic plug 8 is removed during the boiling of water, the base potential of the transistor 21 becomes low and a base current flows through the resistors 18 and 19, so the transistor 21 is turned on and the discharge current of the capacitor 12 flows to the buzzer 22. Therefore, the buzzer 22
A beep sounds to notify the user that the plug 8 has been removed, power to the heater 3 has been cut off, and the water boiling operation has been interrupted.

Similarly, if the power cord is accidentally unplugged from the outlet while boiling water, or if a power outage occurs, transistor 21 turns on and capacitor 1
2 (capacitor 20) flows to the buzzer 22, which can notify the user that the water boiling operation has been interrupted.

(g) Effects of the invention As described above, according to the invention, not only when the magnetic plug comes off during the heating operation of the device, but also when
If the power cord is accidentally unplugged from the outlet,
Alternatively, if the power supply to the device is interrupted due to a power outage and the heating operation is interrupted, the control circuit detects this condition and discharges the backup circuit to activate the buzzer. It is possible to reliably notify the user that the heating operation has been interrupted against the user's will.

[Brief explanation of drawings]

FIG. 1 is a partial side sectional view of the electric jar pot of the present invention, and FIG. 2 is a similar electric circuit diagram. 1... Jar pot body (heating equipment body), 2
... Container, 3 ... Heater, 8 ... Magnetic plug, 12 ... Capacitor (backup circuit),
13...control circuit, 22...buzzer.

Claims (1)

[Scope of utility model registration request] A heating device main body having a bottomed cylindrical container and a heater for heating the container, and a magnetic plug detachably connected to the main body, a backup circuit, a buzzer, and a power supply to the main body. An electric heating device comprising: a control circuit that detects whether or not power is being applied, and when the application of power is stopped, causes the backup circuit to discharge and operate the buzzer.