KR890000030Y1 - Level control apparatus of water storage tank - Google Patents

Abstract

No content.

Description

Liquid level control of storage tank

1 is a circuit diagram showing the overall configuration of the present invention.

2 is a circuit diagram showing a conventional liquid level controller.

* Explanation of symbols for main parts of the drawings

E ₁ , E ₂ , E ₃ : Sensor rod RET ₂ : Rectifier circuit

Q ₁ , Q ₂ , Q ₃ : Transistor RL: Relay

P ₁ : Pump M ₁ : Motor

SR: Selection switch SR ₁ -SR ₄ : Selection switch contact

RL ₁₃ ⓐ, RL ₃ ⓑ: Relay contact C: Movable contact

MC ₁ : Magnet MC: Magnet Contact

The present invention relates to a liquid level control device of a storage tank used for storing a certain amount of industrial water or residential living water, improves the reliability of the operation and allows the water supply and drainage operation selectively with a simple structure, Regardless of the high or low supply voltage, only one magnet can be used to drive the pump.

Conventionally, the liquid level control device of the storage tank has been widely used for practical use. Looking at the structure, the liquid level of the storage tank is sensed by a sensing rod, and the signal obtained from the storage tank is amplified by a transistor to drive the magnet as an amplified signal. The pump is controlled by the contact to keep the liquid level of the storage tank constant. This causes the magnet drive transistor to malfunction when there are noisy electric fields such as transmission stations, transmission laps, etc. or noise caused by external radio waves. There was a frequent problem, and there was also a problem in that the wiring for the water supply and drainage operation of the pump operated by the magnet was cumbersome, as well as the need to separately purchase and attach the magnet according to the power supply voltage.

The present invention is to make the signal detected by the sensing rod to be negative in order to solve the problems of the conventional storage tank liquid level control device as described above, connecting the water supply and drainage function selection contact point and the pump drive DC The (DC) magnet can be driven directly with a transistor, which will be described in detail with reference to the accompanying drawings.

The motor (M ₁ ) of the relay (RL) and the pump (P ₁ ) operated for the current of the rectifier circuit (RET ₂ ) flowing through the sensing rods (E ₁ ), (E ₂ ), (E ₃ ) In the known ones, the contacts RL ₁ -a, RL'-b, (c) of the relay RL and the selector switch SR between the sensing rod E ₂ and the sensing rod E ₁ . Connect the contacts SR ₁ , SR ₂ and (c) in series and amplify the "-" output of the rectifier circuit RET ₂ connected thereto with the transistor Q ₁ and contact the contact SR of the selector switch SR. ₃ ), a relay (R ₄ ) connected to the NPN and the PNP transistors (Q ₂ ) and (Q ₃ ) via (SR ₄ ), and the collector and emitter of the transistors (Q ₂ ) and (Q ₃ ) connected in parallel. ₁₎ and the connections, as represented by the broken line magnet (MC ', if ₁₎ the exchange acceptance has (MC to the center tap of the power transformer (T)' select ₁₎ switch the magnet (MC ₁₎ (SR ₁₎ (SR ₅ ), (SR ₆ ), (c) and relay (RL) contacts (RL ₁ -c), (RL ₁ -d), (c) and magnets for alternating current (MC ' ₁ ) By connecting A code MC is the contact of the magnet (MC _1), RET ₁ is a rectifier circuit and, LED ₂ relay (RL) and the magnet (MC ₁₎ the display lamp indicating the operational for power supply, R _3, R ₄ , E ₅ , E ₆ , R ₇ are resistors, C ₁ , C ₂ are capacitors, LED ₁ is the power indicator, SL 'is the selector switch for low voltage adjustment, C is the relay (RL) and selection This is the movable contact of the switches SR and SL.

Referring to the effect of the present invention made in detail as follows.

First, turn the selector switch SR to the water supply position, and apply the voltage input to the power transformer T with the selector switch SL to obtain a smooth DC voltage from the rectifier circuit RET ₁ . Assuming that there is no water inside the reservoir, the voltage "+" is applied from the resistor R ₃ to the base of the transistor Q ₁ and the voltage applied to the base of the transistor Q ₃ is the same. A voltage lower than the collector voltage is applied.

Therefore, transistor (Q ₃₎ is in a conductive state of the relay (RL), and the indicator lamp (LED _2), and the magnet (MC _1), the ray re Since the current through the transistor (Q ₃₎ animation (RL) The automatic terminal C leads to the contacts RL _1- b.

In addition, the indicator lamp (LED ₂ ) is turned on, and the motor (M ₁ ) is operated while the (MC) of the magnet (MC ₁ ) is turned "ON", so that the water in the reservoir tank by the rotation of the pump (P ₁ ) Is being supplied and when the movable terminal C of the relay RL is connected to the contacts RL _1-a , the sensing rod E ₁ and the sensing rod E ₂ are "OFF". In this case, the user can know that the pump P ₁ is currently running through the indicator lamp LED ₂ .

If this condition persists for some time, the water level is increased in the storage tank by the operation of the pump (P ₁ ). This state continues until the water level reaches the detection rod (E ₁ ), and the water level is detected in the detection rod (E). ₁ ) When the output current of the rectifier circuit (RET ₂ ) can flow through the sensing rod (E ₃ ) and the water to reach the bar, in the present invention, the capacitor (C ₂ ) is charged and the resistor (R ₆ ) Through the voltage applied to the base of the transistor Q ₁ becomes "-", the transistor Q ₁ is cut off, and the base of the transistor Q ₃ has a "+" level voltage by the resistor R ₅ . Transistor Q ₃ is cut off.

Thus, the current flowing in the relay (RL) and the current flowing in the magnet (MC ₁₎ is a movable contact block (C) of the relay (RL) which was in contact (RL ₁ -a) are contacts (RL _1- b ), The sensing rod (E ₁ ) and the sensing rod (E ₂ ) are short and the contact (MC) of the magnet (MC ₁ ) is "OFF", so the motor (M ₁ ) is stopped. Supply of water by the pump P ₁ is cut off, and the indicator lamp LED ₂ is turned off, so it can be easily seen that the operation of the pump P ₁ is stopped.

As the water in the storage tank consumption in this state, the water level in the storage tank is, and gradually beginning to fall, than some time has elapsed it is looking sensing rod detection would be the water level drop below the (E ₁₎ rods (E ₁₎ It is connected to the sensing rod E ₂ installed at a much lower position, so that the current state is maintained until the water level is lower than the sensing rod E ₂ .

After a while, when the water level drops lower than the sensing rod E ₂ , the voltage is supplied to the base of the transistor Q ₁ because the "+" voltage supplied by the resistor R ₃ is applied to the base of the transistor Q ₃ . The transistor Q ₃ is brought into a conductive state with a "-" bias voltage.

Therefore, in the relay RL and the magnet MC ₁ , the flow of current resumes and the operation of the motor M ₁ is resumed by the operation of the contact MC, and the water level of the storage tank is controlled by the pump P ₁ . Starts to rise again and the contact RL _1-a of the relay RL and the movable contact C are connected to each other so that the detection rod E ₁ and the detection rod E ₂ are disconnected. As in the operating state, the water level of the storage tank rises to the sensing rod E ₁ , the power of the motor M is cut off by the contact MC, and the sensing rod E ₁ and the sensing rod E ₂ . As water is shortened and water is used, the water level is lowered below the sensing rod (E ₂ ), and the water level in the storage tank is continuously maintained at a constant water level by repeating the process of rising again. the invented support obtained by means of, unlike the conventional storage tank liquid level control device detection rod _{(E 1), (E 2} ) "-" after the transistor (Q ₃₎ amplifying the signal voltage of, geotyieoseo one be applied to the (Q ₂₎ because it can to compensate for this, even if the external signal noise personnel transistor _{(Q 2), (Q 3} ) It is possible to prevent the malfunction of the magnets. The magnet MC ₁ is composed of transistors Q ₂ and Q ₃ so that the contact MC can be controlled regardless of the input power. Magnet (MC ' ₁ ), selector switch (SR') and relay (RL) contact (SR ₅ ) (SR ₆ ) (RL ₁ -c) (RL ₁ -d) (C) The magnet MC ' ₁ may be connected to the middle tap on the input side of the transformer T.

That is, when the current flows through the relay RL by the operation of the electric bar, when the contacts RL ₁ -c and the movable contact C are connected, the input current of the transformer T is placed in the water supply position. After passing through the contacts of the relay RL, flows to the magnet MC ' ₁ to turn on the contact MC, the motor M ₁ is operated, and the storage tank is full and the relay RL is filled. When the flowing current is cut off relay contact (RL ₁ -d) and the movable contact (C) is connected to Motor, because current is flowing in the block (M ₁₎ the rotation of Motor (M ₁₎ is stopped to be stored in It is possible to keep the face value almost constant.

And, releasing the select switch (SR) to a multiple position at this time as opposed to detection of an electrical operating rod _{(E 1), (E 2} ) on even if the water level is not reached by conduction of the transistor (Q ₁₎ transistor (Q ₂ ) is cut off, so relay (RL) and the magnet (MC _1), so there can not flow a current relay (RL) and the magnet (MC ₁₎ has a stop movable pump (P _1), so no current to flow And drainage.

In this way, the present invention can be used with confidence because it is not malfunctioned even when installed in a place where there is a strong external noise in a power transmission facility, and the drainage and water supply operation can be conveniently selected by the selection switch (SR). It is possible to drive the motor with only one magnet regardless of the input voltage, so there is no need to purchase and install the magnet separately according to the power supply voltage, so it is convenient to use and inexpensive to manufacture. It is a useful design made.

Claims (2)

The current of the rectifier circuit RET ₂ flowing through the sensing rods E ₁ , E ₂ , and E ₃ flows through the relay RL to operate the motor M ₁ of the pump P ₁ . In the known, between the sensing rod E ₂ and the sensing rod E ₁ , the contacts SR ₁ , SR ₂ , RL ₁ -a of the selection switch SR, the relay RL, Connect (RL ₁ -b) and (C) in series, and amplify the "-" output of (RET ₂ ) at the transistor Q _{1 with the} positive charge connected to it, and then contact the contact point SR ₃ of the selector switch SR. And (SR ₄ ) and (C) to connect NPN and NPN transistors (Q ₂ ) and (Q ₃ ), and the collector and emitter of transistors (Q ₂ ) and (Q ₃ ) are connected in parallel. ray (RL) and the magnet (MC ₁₎ and connected, and Motor liquid level control device of a storage tank to drive the (M ₁₎ of the pump (P ₁₎ using the same contact (MC). The contacts SR ₅ , SR ₆ , and SL ₁ -of the selection switch SR and the relay RL, wherein the magnet MC ₁ is connected to the intermediate wrap of the input side of the transformer T. c), (L _1- d), (C) and the liquid level control device of the storage tank replaced by the alternating magnet (MC ').