Three-phase water pump water supply and drainage control and voltage-type water level display

Abstract

A negative electrode of rectifier bridge output is connected in series with a voltage dividing resistor, a relay coil, a fuse and a negative electrode of a grounding diode in sequence; a circuit led out of a positive electrode of the grounding diode is connected with an upper limit water level point A of a water tank; another circuit led out of the positive electrode of the grounding diode is connected with a negative point B on a lower limit water level of the water tank after being connected in series with normally open contacts of a relay and a normally closed button; a voltage stabilizingtube is connected in parallel to two ends of the relay coil; an alternating current power supply is connected to input ends of a two-way reversing switch; output ends of the two-way reversing switch are used for reversing connection between normally closed contacts and the normally open contacts of the relay; transfer contacts of the relay are connected with a water pump motor; a positive electrode of the rectifier bridge output is connected series with the fuse, a current limiting resistor, the voltage dividing resistor, the grounding diode and a water level resistor series group in sequence;and a direct current voltmeter is connected in parallel to the current limiting resistor. When the water level is lower than a lower limit, the normally closed contacts of the relay are connected with the water pump motor, and the water pump starts to supply water. When the water level rises to A, the relay is pulled in, the normally closed contacts of the relay are switched off, and the water pump stops supplying water. When the water level drops below the point B, the relay coil is free from current, the relay is released, the normally closed contacts are switched on, and the water pump supplies water again. During drainage of accumulated water, the alternating current power supply is switched to one normally open contact of the relay through the two-way reversing switch, and the waterpump drains water when the water level is high and stops running when the water level is low, so that switching between water supply and drainage is realized.

Description

technical field [0001] The invention belongs to the field of electric appliances. Background technique [0002] The existing technology of using floating magnets to trigger the closing (or disconnecting) of the reed switch contacts to control the water level, because the current capacity that the reed switch contacts can control is small, it must be equipped with an amplifying power system. And can not display the water level height. [0003] Its bigger shortcoming is that it lacks versatility, and its upper and lower water level difference is fixed, and the water tank of different height must select the controller of different specification for use. [0004] There are also electrode-type water level controllers or electrode-type water level indicators. However, the electrode type water level controller or electrode type water level indicator has the following disadvantages: [0005] 1. They both have only one function, and they need to be used together to both display an...

AI Technical Summary

Problems solved by technology

Line installation is cumbersome and the failure rate is high

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