JP2674222B2 - Hot water dispenser for electric jar pot - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a hot water dispenser for an electric jar pot that heats water contained in a container by boiling it.

2. Description of the Related Art Conventionally, as a hot water discharging device for the jar pot, a commercial power source is directly applied to an electromagnetic pump to send air into the container, and hot water is discharged to the outside of the container by utilizing an increase in pressure inside the container.

However, in such a conventional configuration, since only a commercial power source having a constant frequency is applied to the electromagnetic pump, the amount of hot water output cannot be changed, and the amount of hot water spatters may vary depending on the size of the pouring container. There are problems that it takes time and that the fluctuations are large due to the fluctuation of the commercial power supply voltage.

The present invention solves this problem and provides an easy-to-use tapping device for an electric jar pot.

Means for Solving the Problems In order to solve the above problems, the hot water outlet of the electric water heater of the present invention is a rectification output of the rectification stack, wherein a series circuit of a heat insulation heater and an AC input terminal of the rectification stack is connected to an AC power supply. The terminal has a voltage setting circuit that connects the collector and emitter of the transistor, and connects the series circuit of the motor and diode to the collector and emitter of the transistor, and can set multiple voltages. The transistor is configured to be turned on and off so that

Operation According to the above configuration, the terminal voltage of the motor is detected and the voltage applied to the motor is controlled, so that the set voltage can be accurately applied to the motor without being affected by variations in the voltage of the AC power supply. . Also, since a plurality of motor applied voltages can be set, the amount of hot water discharged can be adjusted according to the application.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 2, 1 is a container for containing water, 2 is a lower part of the container 1, a pump for discharging the water in the container 1 to the outside, 3 a motor for driving the pump 2 and 4 to remove the water. A discharge pipe 5 for discharging the water to the pump 2 is a discharge pipe connecting the discharge port 4 and the pump 2, and 6a and 6b are switches to be pushed by the user when the hot water is discharged.

In FIG. 1, 7 is an AC power source and 6g is a switch, which is interlocked with the switch 6a and the switch 6b and is configured to be closed when the switch 6a or the switch 6b is closed. 8
Is a heat retention heater, 9 is a rectifying stack, 10 is a transistor,
11 is a diode, 13 is a comparator 14, reference voltage generation circuit 15, voltage setting circuit 6, transistors 16, 17, resistors 18, 19, capacitors
A control circuit composed of 20, 21 and the comparator 14
Is composed of transistors 14a, 14b, resistors 14c, 14d,
Moreover, the voltage setting circuit 6 includes switches 6a, 6b, resistors 6c, 6d, 6e, 6f.
Further, the reference voltage generation circuit 15 includes an LED 15a,
It is composed of a resistor 15b. The LED 15a is used as a constant voltage diode.

Next, the operation will be described. When the switch 6a is pressed, the switch 6a and the switch 6g are closed, and the AC power supply 7 is connected to the heater 8
Full-wave rectification is performed through the rectification stack 9, and the capacitor 21 is charged through the diode 11. In this case, resistors 6c, 6
If the values of d, 6e, 6f are R _6c , R _6d , R _6e , R _6f respectively, then V
_a <until V _c (potential at point c), i.e., V _M (motor terminal voltage)> (a point of potential) V _F (forward voltage of _{LED15a) × (R 6c + R} 6d + R 6e + R 6f) Until / R _6c (1), the output of the comparator 14 becomes LOW and the transistors 16, 17, 10 are turned off. However, when the capacitor 21 is charged until the expression (1) is satisfied, the output of the comparator 14 becomes HIGH, the transistors 16 and 17 are turned on, and the base-emitter voltage of the transistor 17 is V _BE , and the resistance 18
Assuming that the resistance value of R ₁₈ is R ₁₈ , the current of V _BE / R ₁₈ flows through the collector of the transistor 16, and as a result, the transistor 10 turns on, the current of the heater 8 flows toward this transistor 10, and the capacitor 21 Of the electric current flows to the motor 3. Then, the pump 2 rotates and the hot water in the container 1 is discharged from the discharge port 6 through the discharge pipe 5. By the way, the non-inverting input and the output of the comparator 14 are connected by the capacitor 20, and when the output becomes HIGH, the potential of the non-inverting input also rises. Therefore, even if the voltage of the capacitor 21 begins to drop, the comparator 14
The potentials of the inverting input and the non-inverting input of are not reversed, and the electric charge of the capacitor 20 is discharged to some extent through the resistor 19, that is, after a certain time (here, about 500 μ
The values of the capacitor 20 and the resistor 19 are set so that it becomes s), the potentials of the inverting input and the non-inverting input of the comparator 14 are reversed, the output of the comparator 14 becomes LOW, and the transistors 16, 17, 1
0 turns off. Also in this case, the capacitor 1
The potential of the non-inverting input of 4 decreases, and after a certain period of time, the output of the comparator 14 changes from LOW to HIGH, and the transistor 16 and
17,10 turns on. In this way, the transistor 10 performs a switching operation in a cycle of about 1 ms, bypassing the extra heater current, and changing the terminal voltage of the motor 3 to V _F
Keep it at × (R _6c + R _6d + R _6e + R _6f ) / R _6c (this is V _H ). On the other hand, when the switch 6b is pressed, the terminal voltage of the motor 3 is V _F × (R _6c + R _6d + R _6e + R _6f ) / (R _6c
+ R _6d ) (this is _VL ). In this embodiment, the set voltage is V _H and V _L , but the set voltage can be arbitrarily changed by increasing the number of resistors and the number of switches of the voltage setting circuit 6, and the hot water discharge flow rate can be arbitrarily changed. be able to.

EFFECTS OF THE INVENTION As is clear from the description of the above embodiments, according to the present invention, the terminal voltage of the motor is controlled so that the terminal voltage of the motor is controlled to the set voltage by detecting the terminal voltage of the motor. The hot water discharge flow rate can be set accurately without being affected by the voltage fluctuation of the power supply, and the hot water discharge flow rate can be set according to the application. Also, since the current bypass transistor of the warming heater is switched to a constant voltage, a current of the warming heater of, for example, about 50 W is reduced to 1 W.
It can be controlled by a class of transistors.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an electric jar pot showing an embodiment of the present invention, and FIG. 2 is a partially cutaway side view of the electric jar pot. 1 ... Container, 2 ... Pump, 3 ... Motor, 6 ... Voltage setting circuit, 7 ... AC voltage, 8 ... Insulation heater, 9 ...
Rectifier stack, 10 ... Transistor, 11 ... Diode, 13 ... Control circuit, 14 ... Comparator, 15 ... Reference voltage generation circuit.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Koji Noda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Makoto Katagasu, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Incorporated (56) Reference JP-A-57-131417 (JP, A) Actually opened 64-11136 (JP, U) Actually open 1-11-11531 (JP, U)

Claims (1)

(57) [Claims] 1. A container for containing water, a pump for discharging water in the container, and a motor for driving the pump, wherein a series circuit of a heat insulation heater and an AC input terminal of a rectifying stack is connected to an AC power source, The collector and emitter of the transistor are connected to the rectified output terminal of the rectifier stack, the series circuit of the motor and the diode is connected to the collector and emitter of the transistor, and the transistor is turned off when the terminal voltage of the motor is less than or equal to a set voltage. If the terminal voltage of the motor is equal to or higher than the set voltage, a control circuit that turns on the transistor is connected in parallel with the motor, and the control circuit includes a comparator, a reference voltage generation circuit, and a voltage setting circuit that can set a plurality of voltages. The reference voltage of the reference voltage generating circuit is connected to the non-inverting input of the comparator through a resistor, and the voltage setting circuit is connected to the inverting input of the comparator. The non-inverting input and tapping device for an electric pots constituted by connecting a capacitor to the output of the comparator.