JPS59215979A - Automatic stopping device for electric pump - Google Patents

Abstract

PURPOSE:To enable to decrease consumption of batteries by making an ON- switch to start a pump drive motor an automatic returning type for switching off the ON-switch when the liquid level reaches a fixed level and the motor is automatically stopped. CONSTITUTION:When an automatic returning type ON-switch 16 is put on, transisters Tr4 and 5 of F-F circuits (4-7) are put on together with an output Tr8 to drive a pump drive motor 18 and a light emitting diode 2. At this time, a photo Tr3 to receive light is put on, and a charging of a delay condenser 12 is prevented, so that a Tr10 for reset keeps being off and the motor 18 keeps rotation. When a liquid level goes up to reach a fixed level and a prism 1 is sunk in water, the Tr3 is put off. Then the condenser 12 starts being charged and the F-F circuits are put off by putting the Tr10 on, while the output Tr8 is also put off to stop the motor 18 and the ON-switch 16 is put off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application: 2. Industrial Field of the Invention The present invention relates to an automatic stop device for an electric pump.

Conventional configuration and its problems In conventional electric pump automatic stop devices, when starting the electric pump, it was started by turning on the power switch, but the motor that drives the electric pump once If you leave the power switch on after the machine has automatically stopped, the battery may discharge and become unusable. Therefore, the power switch
After the motor automatically stops, it is necessary to turn it off.

Purpose of the Invention The present invention solves the above-mentioned problems of the conventional technology.After the liquid level detection device operates and automatically stops the liquid supply, the on switch that is the power switch has to be turned off each time. too,
It is said that the battery will run out, and even if the user uses the machine incorrectly, for example, if the on switch is pressed continuously, if the liquid level detection device is activated, it will automatically stop, and then the liquid level detection device will The motor for driving the electric pump remains stopped even when the pump is lifted out of the liquid, and the motor also stops even if both the on and off switches are pressed, ensuring safe operation at all times. The purpose is to provide.

Structure of the Invention In order to achieve the above object, the present invention includes a liquid level detection device consisting of a light emitting element and a light receiving element incorporated in a prism, a +Φ1ψ, a flip-flop, and a flip-flop using the output of the light receiving element. It is equipped with a reset circuit that gives a reset signal, an output circuit that controls a motor for driving the electric pump according to the state of the flip-flop, and an automatic return type on/off switch that starts and stops the motor. By effectively combining the flip-flop and other functions, it is easy to use and can reliably stop the motor even in case of misuse.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to accompanying drawings. In the figure, a person is a liquid level detecting device, and this liquid level detecting device A is constructed by incorporating a light emitting diode 2 as a light emitting element and a light receiving phototransistor 3 as a light receiving element into a prism 1. 4 and 5 are flip-flop transistors, 6 is a resistor connected to the base of transistor 4, 7 is a resistor connected to the base of transistor 6, 8 is an output transistor, and 9 is a resistor connected to the base of output transistor 8. , 10 reset transistors, 11 a resistor connected to the base of the reset transistor 10, 12 a delay capacitor, 13.1
4 is the photodetector phototransistor 4, 5;
17 is an automatic return type off switch that resets the flip-flop transistors 4 and 5, 18 is a motor for driving the electric pump, and 19 is an on switch 166 connected in series with the vapor. 20 is a noise absorbing capacitor connected in parallel with the motor 18; 21 is a current limiting resistor; 22 is a resistor connected between the base and emitter of the transistor 5; 23 is the on switch 16; and a battery connected in series with the off switch 17.

The operation in the above circuit configuration will be explained. Now, when the liquid level has not reached the predetermined liquid level, the light from the light emitting diode 2 is reflected by the prism 1 and enters the light receiving phototransistor 3. As a result, the light receiving phototransistor 3 is turned on. When the liquid level reaches a predetermined level and the prism 1 is submerged in the liquid, the light from the light emitting diode 2 is diffused into the liquid, so almost no light enters the phototransistor 3 for light reception, and as a result, the light reception The phototransistor 3 is turned off. Note that the transistor 4. Transistor 5. Resistor 6 and resistor 7 constitute a flip-flop, which is turned on or off. The output transistor 8 and the resistor 9 constitute an output circuit, and when the flip-flop transistor 4 turns on, the motor 18 and the light emitting diode 2 are driven. Further, the reset transistor 10. resistance 1
1. The delay capacitor 12.degree. resistor 13.14 constitutes a reset circuit, and when the light receiving phototransistor 3 is on, the voltage of the delay capacitor 12 becomes close to zero volts, and the reset transistor 1o is turned off. When the light receiving phototransistor 3 is turned off, the base current of the reset transistor 1o flows through the resistors 11 and 14.
, the reset transistor 10 is turned on and at the same time, the flip-flop transistor 4 is turned off and the flip-flop is turned off. The power-on reset capacitor 15 is provided to ensure that the flip-flop is turned off when the power is turned on. The on switch 16 is used when starting the motor 18, and turns on the flip-flop transistors 4 and 6 when turned on instantaneously. The off switch 17 is used when the motor 18 is manually stopped. When the motor 18 is turned on instantaneously, the base current of the reset transistor 1o is changed to the resistance 11.
When no current flows through the circuit, the reset transistor 10 is turned on and the flip-flop transistor 4.5 is turned off. This turns off the output transistor 8, so the motor 18 stops.

Now, assuming that the power is turned on and the flip-flop is off, the charge on the delay capacitor 12 will be transferred to the resistor 14.
．． Since the voltage is discharged through the reset transistor 19, the emitter-base voltage of the reset transistor 10 is zero volts. At this time, the flip-flop transistor 4,
6. Output transistor 8, on switch 16 and off switch 17 are all off, so almost no power supply current flows. When the on switch 16 is turned on in this state, the base current r1 of the flip-flop transistor 4 flows through the resistor 6, so that at the same time as the flip-flop transistor 4 is turned on, the transistor 5 is also turned on and the flip-flop is turned on. When the flip-flop transistor 4 is turned on, the output transistor 8 is turned on, and the motor 18 and the light emitting diode 2 are driven. At this time, the delay capacitor 12 is charged through the resistor 14, but if the light emitting diode 2 starts emitting light immediately after the on switch 16 is turned on, the light receiving phototransistor 3 is turned on, and the delay capacitor 12 is charged by the resistor 13. Since charging of 12 is prevented, the reset transistor 1° remains off. As a result, the flip-flop and output transistor 8 remain on, and the motor 18 rotates. In this state, when the liquid level reaches a predetermined level and the prism 1 is immersed in the liquid, the light from the light emitting diode 2 cannot be diffused into the liquid, and the light receiving phototransistor 3 is turned off. As a result, the delay capacitor 12 is charged through the resistor 14 and the flip-flop transistor 5, and the potential between the base and emitter of the J transistor 1o rises, turning on the reset transistor 1°. "This is G": the flip-flop turns off 91.-2., and the output transistor 8 also turns off, and the motor 1
8 stops.

Next, the operation in the case of abnormal use will be explained. now,
When the on switch 16 and the off switch 17 are turned on, the base current of the reset transistor 10 flows through the resistor 11 and the off switch 17.
The reset transistor 1o is turned on. This results in
Flip-flop transistor 4 and output transistor 8 are turned off, and motor 18 is stopped. Further, when the on switch 16 is turned on continuously, when the light receiving phototransistor 3 is turned off, the delay capacitor 12 is connected to the resistor 14. It is charged through the on switch 16, and the reset transistor 1o is turned on. As a result, the flip-flop transistor 4 and the output transistor 8 are turned off, and even if the on switch 16 is still pressed, the motor 18 is stopped when the predetermined liquid level is reached. If the liquid level detection device is still in this condition and the person is removed from the liquid,
Since the light emitting diode 2 stops emitting light, the light emitting diode 2
- The light-receiving phototransistor 3 remains off, and the phototransistor 3 remains off.
8 continues to stop. When the on switch 16 is turned off in this state, the delay capacitor 12 is discharged via the resistor 14 and the resistor 19, so that it can be returned to its initial state.

Effects of the Invention As described above, according to the present invention, the on switch for starting the pump drive motor is of an automatic return type, so that when the liquid level reaches a predetermined level, the liquid level detection device automatically turns on the pump. When the drive motor is stopped, the on switch connected in series with the battery is in the off state.
This not only prevents battery consumption, but also eliminates the need to turn off the power switch each time, making it easy to use and prevents misuse. It has the excellent feature of being able to reliably stop the pump drive motor by effectively combining other functions.

11 Be-

[Brief explanation of drawings]

The figure is an electric circuit diagram of an automatic stop device for an electric pump according to an embodiment of the present invention. A... Liquid level detection device, 1... Prism, 2... Light emitting diode (light emitting element), 3...
...Phototransistor for light reception (light receiving element), 4.
6...Transistor for flip 7o tube, 8.
... Output transistor, 1o ... Reset transistor, 12 ... Delay capacitor, 16 ... On switch, 17 ... Off switch, 18...Electric pump drive motor, 23...Battery.

Claims (1)

[Claims] A liquid level detection device consisting of a light emitting element and a light receiving element built into a prism, a flip-flop, a reset circuit that gives a reset signal to the flip flop based on the output of the light receiving element, and an electric pump drive device based on the state of the flip flop. It is equipped with an output circuit for controlling the motor, an automatic reset type on switch for setting a flip-flop, a battery connected in series with the on switch, and an automatic reset type off switch for resetting the flip-flop. While driving the element with an output circuit,
An automatic stop device for an electric pump configured such that the reset circuit is inoperative immediately after the ounce inch is turned on, and when the on switch is turned on continuously, the reset circuit is activated by the output of the light receiving element, thereby enabling flip-flop operation. .