CN214475479U

CN214475479U - Simple water leakage detection and alarm circuit

Info

Publication number: CN214475479U
Application number: CN202120768494.3U
Authority: CN
Inventors: 塔特; 韦桉余; 麻丽娟; 王惠宇
Original assignee: Changzhou Vocational Institute of Light Industry
Current assignee: Changzhou Vocational Institute of Light Industry
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-10-22
Anticipated expiration: 2031-04-14

Abstract

The utility model belongs to the technical field of the detection that leaks, especially, relate to a detection and warning circuit simply leak, include: a simple water leakage detection and alarm circuit, comprising: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a diode D1, a triode Q1, a comparator U1 and a relay; the input port J1 connects in series the sensor and the rope that leaks of leaking, when leaking the emergence, the rope that leaks detects to leak and sends the signal for leaking the sensor, and output J2 connects bee calling organ for the suggestion of leaking the warning. The utility model discloses detecting and adopting the bridge type to detect the principle with warning circuit simply leaking, the circuit is simple reliable, through adjusting bridge arm resistance, adaptable different sensor that leaks, the practicality is strong.

Description

Simple water leakage detection and alarm circuit

Technical Field

The utility model belongs to the technical field of the detection that leaks, especially, relate to a detection and warning circuit simply leak.

Background

The household water leakage prevention system can reduce the waste of water resources, reduce the property loss caused by water immersion of furniture and floors, effectively avoid accidents such as electric shock and fire caused by water leakage, and has great significance.

The existing water leakage detection circuits are more, but are not suitable for household water leakage detection, for example, water leakage is detected through an electrode type water sensor, and the water leakage can be detected only when water leakage occurs at a specific position, so that the water leakage detection circuit has limitation; the PLC and the flow sensor are used for detecting water leakage, so that the cost is high; the sensing cable with the partial pressure compensation is used for detecting water leakage, and is suitable for detecting and positioning water leakage of a machine room; the optical fiber sensor is arranged on the water meter to detect water leakage, so that the water meter is not suitable for detecting small water seepage, and the water leakage detection circuit is complex, the system detection cost is high, and the practicability is not strong.

SUMMERY OF THE UTILITY MODEL

The problems existing in the prior art are solved: the utility model discloses detecting and warning circuit simply leaking adopts the bridge type to detect the principle, and the circuit is simple reliable, through adjusting bridge arm resistance, adaptable different sensor that leaks, and the practicality is strong.

The utility model adopts the technical proposal that: a simple water leakage detection and alarm circuit, comprising: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a diode D1, a triode Q1, a comparator U1 and a relay;

pins

1 and 2 of the input port J1 are connected with a capacitor C2 in parallel, the upper end of a capacitor C2 is connected with the lower end of a resistor R1 and a pin 2 of a comparator U1 respectively, the lower end of a capacitor C2 is connected with a resistor R5 in series, one end of the rear end of the capacitor C2 is connected with a pin 3 of a comparator U1, and the other end of the rear end of the capacitor C2 is connected with a 5V power supply in series;

a pin 1 of the comparator U1 is connected with a resistor R4 in series and then is connected with the base electrode of a triode Q1; the emitter of the triode Q1 is grounded; the collector of the triode Q1 is respectively connected with the anode of the diode D1 and the pin 6 of the relay; the cathode of the diode D1 is connected with the 5 pin of the relay, and the cathode of the diode D1 is connected with the 5V power supply;

pins

1 and 2 of the relay are connected in parallel and then connected with a pin 1 of the output end J2; the 4-pin series resistor R3 of the relay is connected with the 2-pin of the output terminal J2.

Further, the input port J1 is connected to a water leakage sensor, the water leakage sensor is connected to a water leakage rope, and when water leakage occurs, the water leakage rope detects a water leakage signal and sends the signal to the water leakage sensor.

Furthermore, the 1,2 pins of the output terminal J2 are connected in series with a buzzer for water leakage alarm prompt.

Further, the relay model is HK-4100F.

The utility model has the advantages that:

1. the alarm threshold is controlled by adjusting the resistance value of the bridge arm resistor, and the alarm is given out by outputting a closing signal through the relay.

Drawings

Fig. 1 is a structural diagram of a simple water leakage detection and alarm circuit of the present invention.

Detailed Description

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

as shown in fig. 1: the utility model discloses the circuit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a diode D1, a triode Q1, a comparator U1 and a relay;

pins

a pin 1 of the comparator U1 is connected with a resistor R4 in series and then is connected with the base electrode of a triode Q1; the emitter of the triode Q1 is grounded; the collector of the triode Q1 is respectively connected with the anode of the diode D1 and the pin 6 of the relay; the cathode of the diode D1 is connected with a pin 5 of the relay and then is connected with a 5V power supply;

pins

1 and 2 of the relay are connected in parallel and then connected with a port 1 of the output end J2; the 4-pin series resistor R3 of the relay is connected with the 2 ports of the output terminal J2.

Input port J1 connects the sensor that leaks, the utility model discloses a sensor model that leaks is LS01N03-S01, and the sensor that leaks is connected with the rope that leaks, and when leaking the emergence, the rope that leaks detects to leak and gives the sensor that leaks with signal transmission, and buzzer is connected to output J2 for the suggestion of reporting an emergency and asking for help or increased vigilance of leaking.

In this embodiment, R1 ═ 200K Ω, R2 ═ 200K Ω, R3 ═ 10 Ω, R4 ═ 2K Ω, R5 ═ 200K Ω, and C2 ═ 104 μ F;

the type of the comparator is HK-4100F, the type of the triode Q1 is 9013, the type of the diode D1 is SS14, and the type of the comparator U1 is 1542;

the utility model discloses the theory of operation does:

the input end J1 inserts the sensor that leaks, when the rope that leaks detects to leak, two induction lines in the rope that leaks short circuit to make the electric current change, the sensor that leaks conducts the circuit change received to detection circuitry, judge output voltage through the voltage size of 2 and 3 pins of comparator U1 in the detection circuitry, the comparative voltage value size of 2 and 3 pins of comparator U1 is changed through adjusting resistance R1, R2 and R5;

when no water leakage occurs, the detection current of the water leakage sensor at the input end of J1 is 0, the input end J1 is equivalent to open circuit, the voltage of the pin 2 of the comparator U1 is greater than the voltage of the pin 3, the output voltage of the comparator 1 is low, the base voltage of the triode Q1 is low, the NPN triode is cut off, no potential difference exists between the two ends of the coils 5 and 6 of the relay HK4100F, the armature of the relay is released, the normally open contact of the relay is released, and the switch is equivalent to open circuit.

When water leaks, a large detection current is generated by a water leakage sensor at the input end of J1, the voltage of a pin 2 of a comparator U1 is less than the voltage of a pin 3, the output voltage of a comparator 1 is high, the base voltage of a triode Q1 is high, an NPN triode is in saturated conduction, a +5V power supply is added to the two ends of a coil of a relay HK4100F, the relay is attracted, a normally open contact of the relay is closed, namely the switch is closed, the circuit of the output end is conducted, and a buzzer gives an alarm.

Through bridge comparison, the impedance of the measured sensor in dry and wet states changes, and through adjusting the resistance values of R1, R2 and R5, the voltage values of the pin 2 and the pin 3 of the comparator U1 can be determined, so that the water leakage signal output threshold value is determined.

The utility model has the advantages that: the alarm threshold is controlled by adjusting the resistance value of the bridge arm resistor, and the alarm is given out by outputting a closing signal through the relay.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A simple water leakage detection and alarm circuit is characterized by comprising: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a diode D1, a triode Q1, a comparator U1 and a relay;

pins 1 and 2 of an input port J1 are connected in parallel with the capacitor C2, the upper end of the capacitor C2 is connected with the lower end of the resistor R1 and a pin 2 of the comparator U1 respectively, the lower end of the capacitor C2 is connected in series with the resistor R5, then one end of the capacitor C2 is connected with a pin 3 of the comparator U1, and the other end of the capacitor C2 is connected in series with the resistor R2 and then is connected with a 5V power supply;

the 1 pin of the comparator U1 is connected with the base electrode of the triode Q1 after being connected with the resistor R4 in series; the emitter of the triode Q1 is grounded; the collector of the triode Q1 is respectively connected with the anode of the diode D1 and the pin 6 of the relay; the cathode of the diode D1 is respectively connected with the 5-pin of the relay and a 5V power supply;

pins 1 and 2 of the relay are connected in parallel and then connected with a pin 1 of an output end J2; and the 4 pins of the relay are connected with the 2 pins of the output end J2 after being connected with the resistor R3 in series.

2. The simple water leak detection and alarm circuit of claim 1, wherein: the input port J1 is connected in series with a water leakage sensor and a water leakage rope.

3. The simple water leak detection and alarm circuit of claim 1, wherein: and the 1,2 pins of the output end J2 are connected with a buzzer in series.

4. The simple water leakage detection and alarm circuit of claim 1, wherein the relay is HK-4100F.