CN209839711U - Single-point water leakage positioning device with distance display function - Google Patents

Abstract

The utility model discloses a single-point water leakage positioning device with distance display, which comprises a detection module and a data processing module. The detection module includes a water leakage detection cable, a constant current source generating unit, a switch switching unit, a first detection unit and a second The detection unit, the water leakage detection cable is connected to the switch switching unit through the external interface, the water leakage detection cable is also connected to the power supply through the constant current source generation unit, the constant current source generation unit is set on the water leakage detection cable, the input end of the first detection unit They are respectively connected to the constant current source generating unit and the switch switching unit, the switch switching unit is connected to the power supply through the first sampling resistor, and the second detection unit is connected in parallel at both ends of the first sampling resistor, the switch switching unit, the first detection unit and the second detection unit Connected with the data processing module. The utility model can quickly detect whether there is water leakage, and accurately locate the location of the water leakage, and has the advantages of sensitive detection, long positioning distance and high positioning accuracy.

Description

A single-point water leakage location device with distance display

technical field

The utility model relates to the technical field of water leakage location, in particular to a water leakage location device with single point and distance display.

Background technique

Our country has a vast territory, and the climate between the north and the south is very different. The winter in the north is long, and there are many heating equipments. The summer in the south is hot, and the refrigeration and air conditioning are popular. It is a potential hidden danger of water leakage accidents.

For relatively large and critical places, the damage caused by water leakage is relatively large, and it is necessary to determine the location of the water leakage as quickly as possible, so that effective measures can be taken in time to prevent greater losses. In particular, if the leakage in the large computer data room cannot be detected and eliminated in time, it will not only cause short circuit and equipment damage, but also cause serious consequences that cannot be estimated, such as damage and loss of important data, business interruption, etc. Therefore, Real-time detection of water leakage is a very important project.

At present, the detection of traditional water leakage detection equipment is not particularly sensitive. Generally, only a few minutes after the occurrence of a water leakage accident, it can be detected and alarmed, which delays the best time for rescue, and the existing water leakage monitoring equipment cannot locate the location of the water leakage. Very few Devices that can be positioned have a particularly short positioning distance, which causes great inconvenience to users.

Utility model content

The purpose of this utility model is to provide a single-point water leakage positioning device with distance display, which can detect water leakage in real time and locate the location of water leakage, thereby solving the problems in the background technology.

In order to achieve the above object, the utility model adopts the following technical solutions:

A water leakage locating device with a single point and distance display, including a detection module and a data processing module, the detection module includes a water leakage detection cable, a constant current source generation unit, a switch switching unit, a first detection unit and a second detection unit, The water leakage detection cable is connected to the switch switching unit through the external interface, and the water leakage detection cable is also connected to the power supply through the constant current source generating unit. The constant current source generating unit is arranged on the water leakage detection cable. The flow source generation unit is connected to the switch switching unit, the switch switching unit is connected to the power supply through the first sampling resistor, the second detection unit is connected in parallel at both ends of the first sampling resistor, the switch switching unit, the first detection unit and the second detection unit are connected with the data processing unit The modules are connected, the first detection unit is used to detect the location of water leakage and whether there is a disconnection, the second detection unit is used to detect whether there is water leakage, the data processing module adopts a single-chip microcomputer, and the single-chip microcomputer is connected with a display.

Preferably, the water leakage detection cable is composed of three wires, which are water-permeable copper wires, insulated copper wires and resistance wires. The water-permeable copper wires and the insulated copper wires are respectively connected to the switch switching unit through the external interface. It is short-circuit connected with the resistance line, and the constant current source generating unit is arranged on the resistance line.

Preferably, the constant current source generation unit adopts a voltage reference chip, the input terminal of the voltage reference chip is connected to the positive pole of the power supply through the first capacitor, the reference voltage output terminal of the voltage reference chip is connected to the positive phase input terminal of the dual operational amplifier, and the dual operation The inverting input terminal of the amplifier is connected to the source of the switch tube, the negative power supply terminal of the dual operational amplifier is grounded through the second capacitor, and a third capacitor is connected in parallel with both ends of the second capacitor, and the negative power supply terminal of the dual operational amplifier is also connected to the second sampler. The resistor is connected to the source of the switch tube, the output terminal of the double operational amplifier is connected to the gate of the switch tube through the first resistor, and the drain of the switch tube outputs a constant current power supply, which is respectively connected to the resistance line and the first detection unit.

Preferably, the switching unit adopts an analog switch, the first input end and the second input end of the analog switch are respectively connected to the interface of the single-chip microcomputer through the second resistance and the third resistance, and the first open end and the second open end of the analog switch The terminals are respectively connected to the water-permeable copper wire and the insulated copper wire through the external interface, the first common end of the analog switch is connected to the second common end, and the logic input end of the analog switch is respectively connected to the first detection unit and the second detection unit through the fourth resistor. unit connected;

The first detection unit adopts the first instrumentation amplifier, the positive-phase input terminal of the first instrumentation amplifier is grounded through the fourth capacitor, the positive-phase input terminal of the first instrumentation amplifier is also connected to the insulated copper wire through the fifth resistor, and the first instrumentation amplifier The inverting input terminal of the first instrumentation amplifier is connected to the non-inverting input terminal of the first instrumentation amplifier through the fifth capacitor, the inverting input terminal of the first instrumentation amplifier is grounded through the sixth capacitor, and the inverting input terminal of the first instrumentation amplifier is also connected through the sixth resistor Connect the constant current power supply, the output terminal of the first instrumentation amplifier is grounded through the seventh capacitor, and the output terminal of the first instrumentation amplifier is also connected with the logic input terminal of the analog switch through the seventh resistor, the first diode and the fourth resistor in turn, The common terminal of the seventh resistor and the first diode outputs the first detection signal;

The second detection unit adopts a second instrument amplifier, the positive-phase input terminal of the second instrument amplifier is grounded through the eighth capacitor, and the positive-phase input terminal of the second instrument amplifier is also connected to one end of the first sampling resistor through the eighth resistor. One end of a sampling resistor is also connected to the positive pole of the power supply through the ninth resistor, the inverting input terminal of the second instrumentation amplifier is connected with the non-inverting input terminal of the second instrumentation amplifier through the ninth capacitor, and the inverting input terminal of the second instrumentation amplifier is connected through the first Ten capacitors are grounded, the inverting input terminal of the second instrumentation amplifier is also connected to the other end of the first sampling resistor through the tenth resistor, and the other end of the first sampling resistor is also connected to the resistance line, and the output terminal of the second instrumentation amplifier is connected to the other end of the first sampling resistor through the eleventh resistor. The capacitor is grounded, and the output terminal of the second instrumentation amplifier is also connected to the logic input terminal of the analog switch through the eleventh resistor, the second diode and the fourth resistor in turn, and the common terminal of the eleventh resistor and the second diode outputs Second detection signal.

Preferably, the first detection signal and the second detection signal are respectively input into the first voltage follower and the second voltage follower, the output terminal of the first voltage follower is connected with a first sampling circuit, and the first sampling circuit includes sequentially The third sampling resistor and the fourth sampling resistor connected through the first voltage follower, the fourth sampling resistor is grounded, the common terminal of the third sampling resistor and the fourth sampling resistor outputs the first sampling signal, and the first sampling signal is input into the single chip microcomputer, and the second The output end of the second voltage follower is connected with a second sampling circuit, the second sampling circuit includes the fifth sampling resistor and the sixth sampling resistor connected to the second voltage follower in turn, the sixth sampling resistor is grounded, the fifth sampling resistor and the sixth sampling resistor are connected to the second voltage follower. The common end of the six sampling resistors outputs the second sampling signal, and the second sampling signal is input into the single chip microcomputer.

Preferably, the voltage reference chip is a MAX6033 voltage reference chip, the dual operational amplifier is an LM358 amplifier, the analog switch is a MAX4608 analog switch, and both the first instrumentation amplifier and the second instrumentation amplifier are AD8221 amplifiers.

The utility model adopts a high-precision water leakage detection unit, which can quickly detect whether there is water leakage, and accurately locate the location of the water leakage, thereby minimizing the loss caused by water leakage; the detection distance of the single-chip microcomputer can reach 1000 meters, and the monitoring range is wide. The single-chip microcomputer can automatically detect the total length of the cable, and there is no need to manually set the total length of the cable. The utility model has the advantages of sensitive detection, long positioning distance and high positioning accuracy, thereby avoiding the problem of inaccurate detection and inability to locate by traditional water leakage detection equipment, which not only saves costs, but also makes management more convenient, bringing great benefits to users. convenient. The circuit diagrams in the utility model are all self-designed, and have the advantages of simple hardware, low cost, high precision of data collection, and safe and reliable transmission of data.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the circuit schematic diagram of the constant current source generation device described in the utility model;

Fig. 3 is the circuit schematic diagram of the external interface described in the utility model;

Fig. 4 is the circuit schematic diagram of the switch switching unit described in the utility model;

Fig. 5 is the circuit schematic diagram of the first detection unit described in the utility model;

6 is a schematic circuit diagram of the second detection unit of the present invention;

7 is a schematic circuit diagram of the first voltage follower and the second voltage follower described in the present invention;

Fig. 8 is the circuit schematic diagram of the first sampling circuit described in the utility model;

FIG. 9 is a schematic circuit diagram of the second sampling circuit of the present invention.

Detailed ways

The technical solution of the utility model is clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

As shown in Figures 1 to 9, a single-point water leakage positioning device with distance display described in the utility model includes a detection module and a data processing module. The detection module includes a water leakage detection cable, a constant current source generating unit, and a switch. The switching unit, the first detection unit and the second detection unit, the water leakage detection cable is connected to the switch switching unit through the external interface, the water leakage detection cable is also connected to the power supply through the constant current source generation unit, and the constant current source generation unit is set on the water leakage detection line On the cable, the input end of the first detection unit is respectively connected with the constant current source generation unit and the switch switching unit, the switch switching unit is connected to the power supply through the first sampling resistor, and the second detection unit is connected in parallel at both ends of the first sampling resistor, and the switch switching unit , The first detection unit and the second detection unit are connected with the data processing module, the first detection unit is used to detect the location of water leakage and whether there is a disconnection, the second detection unit is used to detect whether there is water leakage, and the switch switching unit is used to switch the first The work of the detection unit realizes the alternate detection of water leakage position and disconnection. The data processing module adopts a single-chip microcomputer, and the single-chip microcomputer is connected with a display, and the display is used to display the water leakage position.

The water leakage detection cable is made up of three wires, which are permeable copper wire VCC2_LPM, insulated copper wire VCC2_LM and resistance wire VCC2_R. The end of the resistance line VCC2_R is short-circuited and connected to the first detection unit, wherein the resistance value per unit length of the resistance line VCC2_R is constant.

The constant current source generation unit uses a voltage reference chip U1, the input terminal IN of the voltage reference chip U1 is connected to the positive pole VCC of the power supply through the first capacitor C1, and the reference voltage output terminal OUTS of the voltage reference chip U1 is connected to the positive phase input terminal of the dual operational amplifier U2 , the inverting input terminal of the dual operational amplifier U2 is connected to the source of the switch tube Q1, the negative power supply terminal of the dual operational amplifier U2 is grounded through the second capacitor C2, and a third capacitor C3 is connected in parallel to both ends of the second capacitor C2. The dual operational amplifier The negative power terminal of U2 is also connected to the source of the switch tube Q1 through the second sampling resistor SR2, the output terminal of the dual operational amplifier U2 is connected to the gate of the switch tube Q1 through the first resistor R1, and the drain output of the switch tube Q1 is constant. The current power supply CC_xuA is respectively connected to the resistance line VCC2_R and the first detection unit. In this embodiment, the switch tube Q1 is a field effect tube. The input power supply passes through the voltage reference chip U1 and the dual operational amplifier U2 in turn to form a stable voltage, thereby providing a constant power supply for the first detection unit.

The switch switching unit adopts an analog switch U3, and the first input terminal IN1 and the second input terminal IN2 of the analog switch U3 are respectively connected to the P5.3 and P5.4 interfaces of the microcontroller through the second resistor R2 and the third resistor R3, and the analog switch U3 The first open-circuit terminal NO1 and the second open-circuit terminal NO2 are respectively connected to the permeable copper wire VCC2_LPM and the insulated copper wire VCC2_LM through the external interface J1, the first common terminal COM1 of the analog switch U3 is connected to the second common terminal COM2, and the logic of the analog switch U3 The input terminal VL is respectively connected to the first detection unit and the second detection unit via the fourth resistor R4. The switch switching unit is used to switch the work of the first detection unit to realize the alternate detection of water leakage position and disconnection, and ensure that only one analog switch is turned on at the same time. When the first open-circuit terminal NO1 of the analog switch U3 is turned on, the first The detection unit detects the location of the water leakage, and when the second open-circuit terminal NO2 of the analog switch U3 is turned on, the first detection unit detects whether there is a disconnection.

The first detection unit adopts the first instrumentation amplifier U4, the positive phase input terminal +IN of the first instrumentation amplifier U4 is grounded through the fourth capacitor C4, and the positive phase input terminal +IN of the first instrumentation amplifier U4 is also connected and insulated through the fifth resistor R5 Copper wire VCC2_LM, the inverting input terminal -IN of the first instrumentation amplifier U4 is connected to the non-inverting input terminal +IN of the first instrumentation amplifier U4 through the fifth capacitor C5, and the inverting input terminal -IN of the first instrumentation amplifier U4 is connected through the fifth capacitor C5 The six capacitors C6 are grounded, the inverting input terminal -IN of the first instrumentation amplifier U4 is also connected to the constant current power supply CC_xuA through the sixth resistor R6, the output terminal OUT of the first instrumentation amplifier U4 is grounded through the seventh capacitor C7, and the first instrumentation amplifier U4 The output terminal OUT of the output terminal OUT is also connected to the logic input terminal VL of the analog switch U3 through the seventh resistor R7, the first diode D1 and the fourth resistor R4 in sequence, and the common terminal of the seventh resistor R7 and the first diode D1 outputs the first A detection signal R_ADC. The first detection unit is used to detect the location of the water leakage and whether there is a disconnection, and the detection result is sent to the single chip microcomputer and displayed on the display.

The second detection unit adopts the second instrumentation amplifier U5, the non-inverting input terminal +IN of the second instrumentation amplifier U5 is grounded through the eighth capacitor C8, and the non-inverting input terminal +IN of the second instrumentation amplifier U5 is also connected to the first through the eighth resistor R8 One end of a sampling resistor SR1, one end of the first sampling resistor SR1 is also connected to the positive pole VCC of the power supply through the ninth resistor R9, and the inverting input terminal -IN of the second instrument amplifier U5 is connected to the positive electrode of the second instrument amplifier U5 through the ninth capacitor C9. The phase input terminal +IN is connected, the inverting input terminal -IN of the second instrumentation amplifier U5 is grounded through the tenth capacitor C10, and the inverting input terminal -IN of the second instrumentation amplifier U5 is also connected to the first sampling resistor SR1 through the tenth resistor R10 The other end of the first sampling resistor SR1 is also connected to the resistance line VCC2_R, the output terminal OUT of the second instrumentation amplifier U5 is grounded through the eleventh capacitor C11, and the output terminal OUT of the second instrumentation amplifier U5 is also connected to the eleventh capacitor C11 in turn. The resistor R11, the second diode D2 and the fourth resistor R4 are connected to the logic input terminal VL of the analog switch U3, and the common terminal of the eleventh resistor R11 and the second diode D2 outputs the second detection signal I_ADC. The second detection unit is used to detect whether there is water leakage. If there is water leakage, a constant voltage is generated on the first sampling resistor SR1, and the second instrumentation amplifier U5 extracts the voltage to obtain a second detection signal I_ADC.

The first detection signal and the second detection signal are also respectively input into the first voltage follower U6 and the second voltage follower U7, the output end of the first voltage follower U6 is connected with the first sampling circuit, and the first sampling circuit includes A voltage follower U6 is connected to the third sampling resistor SR3 and the fourth sampling resistor SR4, the fourth sampling resistor SR4 is grounded, the common terminal of the third sampling resistor SR3 and the fourth sampling resistor SR4 outputs the first sampling signal ADC_A0, the first sampling The signal ADC_A0 is input to the single chip microcomputer, and the output end of the second voltage follower U7 is connected with a second sampling circuit, and the second sampling circuit includes the fifth sampling resistor SR5 and the sixth sampling resistor SR6 connected to the second voltage follower U7 in sequence, the sixth The sampling resistor SR6 is grounded, the common terminal of the fifth sampling resistor SR5 and the sixth sampling resistor SR6 outputs the second sampling signal ADC_A1 , and the second sampling signal ADC_A1 is input into the microcontroller. The first voltage follower U6 and the second voltage follower U7 are used to improve the output load capacity, and the first sampling circuit and the second sampling circuit are used to convert the detection signal into an AD signal that can be recognized by the single-chip microcomputer and send it to the single-chip microcomputer.

In this embodiment, the voltage reference chip U1 uses a MAX6033 voltage reference chip, the dual operational amplifier U2 uses an LM358 amplifier, the analog switch U3 uses a MAX4608 analog switch, and both the first instrumentation amplifier U4 and the second instrumentation amplifier U5 use an AD8221 amplifier.

When the utility model is working, the water leakage detection cable is placed in the area to be detected. Under the action of the constant current source, as long as the water is lapped on the water leakage detection cable, a constant current will be generated on the first sampling resistor SR1. The second instrument amplifier U5 extracts the voltage to obtain the second detection signal I_ADC, and then the second voltage follower U7 and the first sampling circuit generate the first sampling signal ADC_A1 that can be recognized by the single-chip microcomputer and input it to the single-chip microcomputer. The single-chip microcomputer controls the analog switch U3 works, when the first open-circuit terminal NO1 of the analog switch U3 is connected, the first detection unit detects the water leakage position, when the second open-circuit terminal NO2 of the analog switch U3 is connected, the first detection unit detects whether there is a disconnection, the second A detection unit outputs the first detection signal R_ADC, the first detection signal R_ADC is converted into the second sampling signal ADC_A0 which can be recognized by the single-chip microcomputer through the first voltage follower U6 and the first sampling circuit, and then input to the single-chip microcomputer, and The display shows the location of water leakage and whether there is a disconnection, so as to realize real-time water leakage detection in the area to be detected. The utility model has the advantages of sensitive detection, long positioning distance and high positioning precision, which brings great convenience to users.

Claims (6)

1. A water leakage locating device with a single-point distance display, characterized in that: it includes a detection module and a data processing module, and the detection module includes a water leakage detection cable, a constant current source generation unit, a switch switching unit, and a first detection unit And the second detection unit, the water leakage detection cable is connected to the switch switching unit through the external interface, the water leakage detection cable is also connected to the power supply through the constant current source generation unit, the constant current source generation unit is set on the water leakage detection cable, the first detection unit The input terminals of the constant current source generating unit and the switching unit are respectively connected, the switching unit is connected to the power supply through the first sampling resistor, the two ends of the first sampling resistor are connected in parallel with the second detection unit, the switching unit, the first detection unit and the second detection unit The second detection unit is connected with the data processing module. The first detection unit is used to detect the location of water leakage and whether there is a disconnection. The second detection unit is used to detect whether there is water leakage. The data processing module adopts a single-chip microcomputer connected with a display. 2. A single-point water leakage locating device with distance display as claimed in claim 1, characterized in that: the water leakage detection cable is made of three wires, which are respectively water-permeable copper wires, insulated copper wires and resistance wires, The permeable copper wire and the insulated copper wire are respectively connected to the switching unit through the external interface, the end of the insulated copper wire is short-circuited to the resistance wire, and the constant current source generating unit is arranged on the resistance wire. 3. A single-point water leakage locating device with distance display as claimed in claim 2, characterized in that: the constant current source generating unit adopts a voltage reference chip, and the input terminal of the voltage reference chip is connected to the positive pole of the power supply through the first capacitor , the reference voltage output terminal of the voltage reference chip is connected to the positive input terminal of the dual operational amplifier, the inverting input terminal of the dual operational amplifier is connected to the source of the switch tube, the negative power supply terminal of the dual operational amplifier is grounded through the second capacitor, and the second The two ends of the two capacitors are connected in parallel with a third capacitor, the negative power supply end of the dual operational amplifier is also connected to the source of the switch tube through the second sampling resistor, the output terminal of the dual operational amplifier is connected to the grid of the switch tube through the first resistor, and the switch The drain stage of the tube outputs a constant current power supply, which is respectively connected to the resistance line and the first detection unit. 4. A single-point water leakage locating device with distance display as claimed in claim 3, characterized in that: said switch switching unit adopts an analog switch, and the first input end and the second input end of the analog switch pass through the second input end respectively. The resistor and the third resistor are connected to the interface of the single-chip microcomputer, the first open-circuit end and the second open-circuit end of the analog switch are respectively connected to the water-permeable copper wire and the insulated copper wire through the external interface, and the first common end of the analog switch is connected to the second common end. The logic input end of the analog switch is respectively connected to the first detection unit and the second detection unit through the fourth resistor; The first detection unit adopts the first instrumentation amplifier, the positive-phase input terminal of the first instrumentation amplifier is grounded through the fourth capacitor, the positive-phase input terminal of the first instrumentation amplifier is also connected to the insulated copper wire through the fifth resistor, and the first instrumentation amplifier The inverting input terminal of the first instrumentation amplifier is connected to the non-inverting input terminal of the first instrumentation amplifier through the fifth capacitor, the inverting input terminal of the first instrumentation amplifier is grounded through the sixth capacitor, and the inverting input terminal of the first instrumentation amplifier is also connected through the sixth resistor Connect the constant current power supply, the output terminal of the first instrumentation amplifier is grounded through the seventh capacitor, and the output terminal of the first instrumentation amplifier is also connected with the logic input terminal of the analog switch through the seventh resistor, the first diode and the fourth resistor in turn, The common terminal of the seventh resistor and the first diode outputs the first detection signal; The second detection unit adopts a second instrument amplifier, the positive-phase input terminal of the second instrument amplifier is grounded through the eighth capacitor, and the positive-phase input terminal of the second instrument amplifier is also connected to one end of the first sampling resistor through the eighth resistor. One end of a sampling resistor is also connected to the positive pole of the power supply through the ninth resistor, the inverting input terminal of the second instrumentation amplifier is connected with the non-inverting input terminal of the second instrumentation amplifier through the ninth capacitor, and the inverting input terminal of the second instrumentation amplifier is connected through the first Ten capacitors are grounded, the inverting input terminal of the second instrumentation amplifier is also connected to the other end of the first sampling resistor through the tenth resistor, and the other end of the first sampling resistor is also connected to the resistance line, and the output terminal of the second instrumentation amplifier is connected to the other end of the first sampling resistor through the eleventh resistor. The capacitor is grounded, and the output terminal of the second instrumentation amplifier is also connected to the logic input terminal of the analog switch through the eleventh resistor, the second diode and the fourth resistor in turn, and the common terminal of the eleventh resistor and the second diode outputs Second detection signal. 5. A single-point water leakage locating device with distance display according to claim 4, characterized in that: the first detection signal and the second detection signal are respectively input into the first voltage follower and the second voltage follower , the output terminal of the first voltage follower is connected with the first sampling circuit, the first sampling circuit includes the third sampling resistor and the fourth sampling resistor which are connected successively through the first voltage follower, the fourth sampling resistor is grounded, and the third sampling resistor The common terminal with the fourth sampling resistor outputs the first sampling signal, the first sampling signal is input to the single-chip microcomputer, the output terminal of the second voltage follower is connected with the second sampling circuit, and the second sampling circuit includes a circuit connected to the second voltage follower in turn The fifth sampling resistor and the sixth sampling resistor, the sixth sampling resistor is grounded, the common terminal of the fifth sampling resistor and the sixth sampling resistor outputs the second sampling signal, and the second sampling signal is input into the single chip microcomputer. 6. A kind of single-point water leakage locating device with distance display as claimed in claim 4, characterized in that: said voltage reference chip adopts MAX6033 voltage reference chip, dual operational amplifier adopts LM358 amplifier, and analog switch adopts MAX4608 analog switch, Both the first instrumentation amplifier and the second instrumentation amplifier use the AD8221 amplifier.