KR940007688Y1 - Automatic control system of water supply - Google Patents

Abstract

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Description

Water supply automatic control device

1 is a circuit diagram of the present invention.

2: The state sensor attached to the tank.

* Explanation of symbols for main parts of the drawings

(2) Tank (S1) (S2): Water level detection terminal

(G1): OR gate (G2)-(G5): NAND gate

(Q1) (Q2): Transistor (PC): Photo Coupler

(LED): Light Emitting Diode (T): Triac

(G): Triac gate terminal (SV): Solenoid valve

The present invention relates to a water supply automatic control device for the purpose of automatically controlling the water level of the water supply tank.

There are many devices and methods to control the water level in the water supply tank. In general, the combination of the reed switch and the magnet has been widely used. However, the contact part of the reed switch is frequently broken, and the control operation by the contact is used. This is inevitable, and the structure is complicated and the price is expensive.

The present invention detects the water level by a non-corrosive conductor and solves the conventional problems by using a high-voltage high-current thyristor, so that the durability and noise due to the inductive spark and the opening and closing contact caused by surge generated in the general electric field It is intended to provide a contactless control device that solves the problem of the present invention will be described in detail with reference to the accompanying drawings as follows.

The upper water level detection terminal (S1) and the lower water level detection terminal (S2) of the present invention are conductors fixed to a height to be controlled at one side of the tank (2), and these upper and lower level detection terminals (S1) (S2) are usually "H". Is connected to the two input terminals of the oar gate G1 which is in an input state, and the output of the oar gate G1 is connected to the base terminal of the transistor Q1 controlling the photocoupler PC and the collector terminal of the transistor Q2. The lower water level detection terminal S2 is connected to the input terminal of the NAND gate G2, and is connected to the output terminal of the NAND gate G2 to one input terminal of the latch circuit composed of the NAND gates G3 and G4. The input terminal is connected to the upper water level detection terminal S1, the output of the latch circuit, that is, the output terminal of the NAND gate G3 is connected to the input terminal of the NAND gate G5, and the output terminal of the NAND gate G4 is transistor Q2. Connected to the base terminal of the NAND gate (G5) Output terminals are connected to the light emitting diode (LED).

On the other hand, the signal of the porter coupler (PC) is configured to trigger the triac (T) by connecting to the gate terminal (G) of the triac (T).

Reference numerals R1-R7 denote resistors C1-C4, capacitor AC, AC power input terminal TF, voltage drop transformer D1, rectifier diode 4, rectifier circuit section 6, AC output terminal.

According to the present invention configured as described above, when the water level in the tank 2 is lower than the low water level detection terminal S2, since the two inputs of the oragate G1 are in the "H" state, the transistor Q1 is operated and the photocoupler PC is operated. The triac T is triggered and the solenoid valve SV connected to the AC output terminal 6 is operated to supply water to the tank 2, and at the same time, the output of the NAND gate G2 is in the "L" state and the NAND gate ( The output of G3) is in the "H" state and the output of the NAND gate G5 is in the "L" state, so that the light emitting diode LED is turned on to indicate the water supply state.

In this state, when the water level of the tank 2 rises and the lower detection terminal S2 contacts the water surface, the ground state is established. Therefore, only one input terminal of the ora gate G1 becomes "L" state, but the output is "H" state. As it is, the water supply continues as described above.

At this time, the output of the NAND gate G2 is changed to the "H" state, but since one input of the NAND gate G4 is in the "H" state, the output of the NAND gate G3 is maintained in the "H" state so that the light emitting diode (LED) ) Lights up continuously.

In this state, when the water level rises further and the upper water level detection terminal S1 comes into contact with the surface of the water, the two inputs of the ora gate G1 are in the "L" state, and thus the output is in the "L" state so that the transistor Q1 is not operated. The trigger signal is not applied to the triac (T) and the solenoid valve (SV) also does not operate, so the water supply is stopped.

On the other hand, when the upper water level detection terminal S1 is grounded, the input of the NAND gate G4 is in the "L" state, so the outputs of the NAND gates G3 and G4 are in the "L" "H" states, respectively, and the NAND gate G5. ) Outputs the " H " state so that the light emitting diode LED is turned off and the transistor Q2 is operated.

In this state, when the water level of the tank 2 is lowered and the upper water level detection terminal S1 is in the "H" state, and the lower water level detection terminal S2 is in the "L" state, the output of the oragate G1 is in the "H" state. However, since the transistor Q2 is in an operating state, the bias voltage is not applied to the base terminal of the transistor Q1, so that the transistor Q1 is not operated.

In this state, when the water level becomes lower and the upper and lower water level detection terminals S1 and S2 are in the "H" state, the output of the oragate G1 is in the "H" state and the output of the NAND gate G2 is "L". State, the outputs of the NAND gates G3 and G4 are changed to the "H" and "L" states, respectively, so that the output of the NAND gate G5 is in the "L" state and the transistor Q2 is not operated. Is applied to the base terminal of the transistor Q1 as a bias voltage to activate the transistor Q1, and the triac T is triggered by the signal of the photocoupler PC and the solenoid valve SV The water supply is recovered by the operation, and the light emitting diode (LED) is also turned on again and the water supply is continued until the water level of the upper level detection terminal (S1) contacts.

That is, the present invention requires frequent operation of the solenoid valve (SV) by an operation in which the water supply operation is performed until the upper water level detection terminal (S1) is connected to the water surface and the water level is lowered below the lower water level detection terminal (S2). It is used to semi-permanently by the non-contact control and to solve the conventional problems.

Claims (1)

The upper and lower water level detection terminals S1 and S2 fixed to one side of the tank 2 are composed of two input terminals of an ora gate G1 and one side input terminal and a gate of a latch circuit of the NAND gates G3 and G4. Respectively connected to the input terminal of (G2), the base terminal of transistor (Q1) and the collector terminal of transistor (Q2) are connected to the output terminal of orifice (G1), and the latch circuit to the output terminal of NAND gate (G2). Connect the other input terminal of the terminal, connect the NAND gate (G5) and the light emitting diode (LED) in series to one output terminal of the latch circuit, and display the water supply, and the base terminal of the transistor (Q2) to the other output terminal of the latch circuit. The photocoupler PC is connected to the collector terminal of the transistor Q1, the gate terminal G of the triac T to which the load is connected to the output terminal of the photocoupler PC is connected to the water level. Water supply automatic control station characterized in that the load is interrupted accordingly .