JPH01164324A - Jar pot - Google Patents

Abstract

PURPOSE: To avoid drive of a pump to prevent water splashing when the water level lowered, by equipping a heater to heat water contained in a vessel, a pump to deliver water in the vessel, and a water level detection means to stop the pump when the water level in the vessel came down to a level equal to or lower than a prescribed value. CONSTITUTION: When a user shuts a drive switch 8, power is conducted to a solenoid coil 22 through a bidirectional thyristor 21 to actuate a pump 3 to deliver water. When the water level in a vessel 1 comes down during water delivery and a float 14 comes down to the level of an LED 11 and a phototransistor 12, the light of the LED 11 is interrupted by the float 14 and cannot reach the phototransistor 12. Since the phototransistor 12 does not turn power ON, voltage at the plus side input terminal of a comparator 19 is higher than the voltage at the minus side input terminal and that the DC power source voltage is divided by a resistance 17 and a resistance 19, the output of the comparator 19 becomes a high level, a drive signal to the bidirectional thyristor 21 is stopped, and power supply to the solenoid coil 22 is stopped even when the drive switch is shut, and then the pump 3 is stopped to stop water delivery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a jar pot for boiling water and keeping it warm in general households.

BACKGROUND OF THE INVENTION Conventional jar pots of this type have a structure in which an air pump using a solenoid coil or a manual air pump is used to increase the air pressure inside the container and push out water.

Problems to be Solved by the Invention However, with such a conventional configuration, when the water level in the container drops to near the intake of the water conduit pipe, air is forced out together with water from the discharge port. However, there was a problem in that the water would splash all over the place, and if the water was at a high temperature, such as when keeping warm, the user could get burned.

The present invention solves the above-mentioned conventional problems, and aims to provide a safe jar pot that can prevent water from splashing by not driving the pump when the water level drops. It is something to do.

Means for Solving the Problems In order to solve the above problems, the jar pot of the present invention includes a bottomed cylindrical container, a heater for heating water contained in the container, and a water heater for heating the water contained in the container. The container has a pump that discharges water, and a water level detection means that stops the pump when the water level in the container falls below a set value.

Effect With the above configuration, when the water level in the container decreases and the water level drops to near the intake of the water conduit pipe, the water level detection means detects the decrease in the water level and stops the pump, thereby removing the water. Discharge is stopped, water can be prevented from splashing, and there is no risk of burns when the water temperature is high, such as when keeping warm, so it is safe.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway side view of a jar pot showing an embodiment of the present invention. In Fig. 1, 1 is a bottomed cylindrical container that stores water, 2 is a heater that heats the water stored in container 1, and 3 is a solenoid that will be described later to increase the air pressure in container 1 and discharge water. 4 is a thermostat to keep the water temperature constant, 5 is a transparent water discharge pipe, and 6 is attached to the bottom of the water discharge pipe 5 to detect when the water level in the container 1 has fallen below a set value. A water level sensor 7 is a circuit board, and the current to the pump 3 is turned on and off by the output signal of the water level sensor 6 as a water level detection means. Reference numeral 8 denotes a drive switch for the pump 3, 9 a jar body for storing the container 1, etc., and IO a lid for opening and closing the upper openings of the container 1 and the container 9.

FIG. 2 is a circuit diagram of a jar pot showing an embodiment of the present invention. In FIG. 2, the water level sensor 6 is connected to the water discharge pipe 5.
A light-emitting diode 11 and a phototransistor 12 are provided at the bottom of the screen to face each other across the water discharge pipe 5.
and a float 14 that can freely move up and down within the water discharge pipe 5 and is positioned by a stopper 13 to block the light from the light emitting diode 11 when the water level drops. The circuit board 7 also includes a DC power supply section 15, a resistor 16 whose one end is connected to the collector of the phototransistor 12 and the other end to the DC power supply section 15, and resistors 17 and 18 connected to the DC power supply section 15. a series circuit, a comparator 19 in which connection points between the phototransistor 12 and the resistor 16 are connected to e input terminals, and connection points between the resistor 17 and the resistor 18 are connected to O input terminals; An energization control element 21 (hereinafter referred to as a bidirectional thyristor) whose gate is driven via the thyristor 20 is installed. 22 is a solenoid coil built into the pump 3, and this solenoid coil 22 is connected in series to a bidirectional thyristor 21 connected to the drive switch 8.

Next, the operation of this configuration will be explained. When the water level is higher than the water level sensor 6, the float 14 is not between the light emitting diode 11 and the phototransistor 12;
Light from the light emitting diode 11 is transmitted to the phototransistor 12
The light is received by the phototransistor 12, and the phototransistor 12 becomes conductive.
The voltage at the Φ input terminals of the comparator 19 is lower than the voltage at the O input terminals obtained by dividing the DC power supply voltage by the resistor 17 and the resistor 18, and the output of the comparator 19 becomes low level, and the bidirectional thyristor 21 is driven. Here, when the user closes the drive switch 8, the solenoid coil 22 is energized via the bidirectional thyristor 21, and the pump 3 is operated to discharge water. Furthermore, when the water level in the container 1 decreases during dispensing and the float 14 comes down to the level of the light emitting diode 11 and phototransistor 12, the light from the light emitting diode 11 is blocked by the float 14 and does not reach the phototransistor 12, causing the Since transistor 12 is not turned on,
The voltage at the e input terminals of the comparator 19 is higher than the voltage at the O input terminals obtained by dividing the DC power supply voltage by the resistor 17 and the resistor 18, and the output of the comparator 19 becomes high level, resulting in bidirectional Even if the drive signal to the thyristor 21 is stopped and the drive switch 8 is closed, the solenoid coil 22 is not energized, the pump 3 is stopped, and water discharge is stopped.

Effects of the Invention As described above, according to the present invention, when the water level becomes lower than the position of the water level sensor, the drive of the pump is stopped and water discharge is stopped, so that air is ejected from the discharge port together with water. This is extremely advantageous in practical terms, as it prevents water from splashing and eliminates the risk of burns that can occur when the water temperature is high, such as when keeping warm.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a jar pot showing an embodiment of the present invention, and FIG. 2 is a schematic diagram of the same jar pot. 1... Container, 2... Heater, 3... Pump, 5...
...Water discharge pipe, 6...Water level sensor (water level detection means),
7... Circuit board, 11... Light emitting diode, 12.
...Phototransistor, 14...Float, 19...
Comparator, 21... Bidirectional thyristor, 22... Solenoid coil.

Claims (1)

[Claims] 1. A cylindrical container with a bottom, a heater that heats the water contained in the container, and a pump that discharges the water in the container;
A water jar pot comprising water level detection means for stopping the pump when the water level in the container falls below a set value.