Underground water level monitoring circuit

Abstract

The invention relates to an underground water level monitoring circuit, which comprises a battery, a voltage acquisition and comparison circuit, a mode switching circuit, a sound-light alarm circuit and a leakage and drop control output circuit, and is characterized in that the battery is a 9V lithium battery and supplies power to the voltage acquisition and comparison circuit, the sound-light alarm circuit and the leakage and drop control output circuit; the voltage acquisition and comparison circuit is used for acquiring underground water body resistance and generating two paths of level signals with opposite states through voltage formed by cross comparison; the mode switching circuit is used for identifying the state of the single-pole double-throw switch and changing the working mode of the circuit and the state of a mode indicator lamp; according to the water level detection device, dual-mode switching is adopted to adapt to different water level detection working conditions, mechanical measurement errors are eliminated through probe resistance measurement, endurance is prolonged through the low-power-consumption design, real-time reminding is achieved through the sound-light alarm, and the water level detection device has the advantages of being simple in structure, convenient to use and high in practicability. And the reliability and response efficiency of underground water monitoring are improved.

Description

Technical Field

[0001] This invention relates to the field of monitoring circuits, specifically a groundwater level monitoring circuit. Background Technology

[0002] Groundwater level monitoring is a core component in safeguarding groundwater resources, preventing geological disasters, and ensuring the sustainable use of water resources. Traditional groundwater level monitoring methods often use float switches combined with manual measurement. Although simple in structure, these methods have many inherent drawbacks, such as poor portability, large measurement errors, lack of alarm feedback, and lack of linkage with well-washing equipment, making it difficult to meet the needs of modern intelligent groundwater monitoring.

[0003] Current groundwater monitoring demands place higher requirements on monitoring equipment. Therefore, this patent proposes a low-power, high-precision groundwater level monitoring circuit design with an audible and visual alarm system, aiming to meet the requirements of high precision, high reliability, and equipment collaboration functions for groundwater level monitoring equipment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a groundwater level monitoring circuit to solve the technical problems that current traditional groundwater level monitoring methods mostly use float switches combined with manual measurement. Although the structure is simple, it has many inherent defects, such as poor portability, large measurement error, lack of alarm information feedback, and lack of linkage function with well washing equipment, which makes it difficult to meet the technical needs of modern intelligent groundwater monitoring.

[0005] To achieve the objective of this invention, the technical solution adopted by this invention is as follows: a groundwater level monitoring circuit is designed, including a battery, a voltage acquisition and comparison circuit, a mode switching circuit, an audible and visual alarm circuit, and a discharge control output circuit. The battery is a 9V lithium battery, which powers the voltage acquisition and comparison circuit, the audible and visual alarm circuit, and the discharge control output circuit.

[0006] The voltage acquisition and comparison circuit is used to acquire the resistance value of groundwater and generate two opposite level signals by cross-comparison of the voltage.

[0007] The mode switching circuit is used to identify the state of the single-pole double-throw switch and change the circuit's operating mode and the state of the mode indicator light.

[0008] The audible and visual alarm circuit is used to emit a buzzer alarm and flash an indicator light when the water surface is detected in the still water level mode and when the water surface is detected in the discharge mode.

[0009] The drain control output circuit is used to output an isolation shutdown signal to the well washing equipment when the drain mode detects that the water has left the water surface.

[0010] Preferably, the working mode includes two working modes: still water level and discharge mode. The still water level mode is used to monitor whether it touches the water surface, and the discharge mode is used to monitor whether it leaves the water surface.

[0011] Preferably, the voltage acquisition and comparison circuit includes a probe J1, a potentiometer J2, a dual-channel differential comparator LM2903, resistors R1, R2, R3, R4, R7, R9, R12, and capacitors C1, C6, C7.

[0012] Preferably, the positive terminal of probe J1 is filtered by C6 and then connected to pins 3 and 6 of the dual-channel differential comparator LM2903. Simultaneously, it is connected to the positive terminal of the battery power supply after being connected in series with R4 and R3. The negative terminal is connected to R7 and then connected in series with potentiometer J2 to the negative terminal of the battery power supply. The 8th pin of the dual-channel differential comparator LM2903 is filtered by C1 and then connected to the positive terminal of the battery power supply. The 4th pin is connected to the negative terminal of the battery power supply. The 2nd and 5th pins are filtered by C7 and then connected to the middle voltage divider point of R1 and R2 in the battery power supply circuit. The 1st and 7th pins are pulled up to the positive terminal of the battery power supply through R9 and R12, respectively.

[0013] Preferably, the mode switching circuit includes a single-pole double-throw switch J5, a resistor R11, capacitors C5 and C8, an XOR gate CD4077, a first light-emitting diode J6, and a first transistor Q1.

[0014] Preferably, the common terminal of the single-pole double-throw switch is connected to pin 1 of the first transistor Q1 and pin 1 of the XOR gate CD4077; the normally open terminal is connected to pin 2 of the XOR gate CD4077 and pin 7 of the dual-channel differential comparator LM2903; the normally closed terminal is connected to pin 1 of the dual-channel differential comparator LM2903; pin 3 of the XOR gate CD4077 is connected to R11 and then in series with the first light-emitting diode J6 to the negative terminal of the battery power supply; pin 14 is filtered by capacitor C5 and then connected to the positive terminal of the battery power supply; pin 7 is connected to the negative terminal of the battery power supply; capacitor C8 is connected in parallel with the first light-emitting diode J6; the first transistor Q1 is a PNP type, and pin 2 is connected to the positive terminal of the battery power supply.

[0015] Preferably, the audible and visual alarm circuit includes a timer NE555, capacitors C2, C3, and C4, resistors R5, R6, R8, and R10, a second transistor Q2, a second light-emitting diode J3, and a buzzer J4.

[0016] Preferably, pins 4 and 8 of the timer NE555 are filtered by C4 and then connected to pin 3 of the first transistor Q1 in the mode switching circuit; pins 2 and 6 are connected to C2 and then to the negative terminal of the battery power supply; pin 5 is connected to C3 and then to the negative terminal of the battery power supply; pin 3 is connected to pin 1 of the second transistor Q2; and pin 7 is connected to R5 and R6. The other end of resistor R5 is connected to pin 3 of the first transistor Q1 in the mode switching circuit; the other end of resistor R6 is connected to pin 6 of the timer NE555; the second transistor Q2 is an NPN type, pin 2 is connected to the negative terminal of the battery power supply, and pin 3 is connected to the negative terminal of the second LED J3; the positive terminal of the second LED J3 is connected to R8 and then to the positive terminal of the battery power supply; the positive terminal of the buzzer J4 is connected to R10 and then to pin 3 of the first transistor Q1 in the mode switching circuit, and the negative terminal is connected to the negative terminal of the battery power supply.

[0017] Preferably, the bleed control output circuit includes a third transistor Q3, resistors R13 and R15, and an opto-MOS relay BCY412S.

[0018] Preferably, pin 1 of the third transistor Q3 is connected to pin 3 of the XOR gate CD4077 of the mode switching circuit, pin 2 is connected to the negative terminal of the battery power supply, and pin 3 is connected to R15 and then to the positive terminal of the battery power supply; pin 1 of the opto-MOS relay BCY412S is connected to R13 and then to pin 3 of the first transistor Q1 of the mode switching circuit, pin 2 is connected to pin 3 of the third transistor Q3, and pins 3 and 4 are connected to the output port, which is connected to the underground water well washing equipment.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention introduces a static water level mode and a discharge mode through a mode switching circuit, which can respectively meet the needs of groundwater level contact detection and water removal detection. This avoids the problem of insufficient adaptability of traditional single triggering methods in well washing, pumping and other working conditions, and improves the practicality and flexibility of groundwater monitoring in different operating stages.

[0021] 2. This invention collects water resistance values ​​through a probe and performs cross-comparison using a voltage acquisition and comparison circuit. It eliminates the need for complex mechanical floating structures, reducing measurement errors caused by float jamming, wear, etc., making the monitoring results more stable and reliable, and suitable for long-term use in field or well environments.

[0022] 3. The circuit of this invention is powered by a 9V lithium battery and uses comparators, transistor switches and other devices for state control. The audible and visual alarm and output module are activated only when the triggering conditions are met, which reduces standby power consumption, extends battery life and reduces the frequency of manual maintenance.

[0023] 4. When the water level is detected to be touching or leaving the set position, the audible and visual alarm circuit of this invention can simultaneously output a buzzer and flashing indicator light, which makes it easy for on-site personnel to identify the abnormal water level status at the first time and avoids the response delay caused by relying solely on instrument readings or background checks. Attached Figure Description

[0024] Figure 1 This is a structural block diagram of the present invention;

[0025] Figure 2 This is a circuit diagram of the voltage acquisition and comparison circuit and the mode switching circuit of the present invention;

[0026] Figure 3 This is a circuit diagram of the audible and visual alarm circuit of the present invention;

[0027] Figure 4 This is a circuit diagram of the leakage control output circuit of the present invention;

[0028] In the diagram: 1. Battery; 2. Voltage acquisition and comparison circuit; 3. Mode switching circuit; 4. Audible and visual alarm circuit; 5. Leakage control output circuit. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Example 1: A groundwater level monitoring circuit, see [link / reference] Figures 1 to 4 It includes a battery 1, a voltage acquisition and comparison circuit 2, a mode switching circuit 3, an audible and visual alarm circuit 4, and a discharge control output circuit 5. It has two working modes: still water level and discharge. The still water level mode is used to monitor whether it touches the water surface, and the discharge mode is used to monitor whether it leaves the water surface.

[0031] Battery 1 is a 9V lithium battery 1, which powers the voltage acquisition and comparison circuit 2, the audible and visual alarm circuit 4 and the leakage control output circuit 5.

[0032] Voltage acquisition and comparison circuit 2 is used to acquire the resistance value of groundwater and generate two opposite level signals by cross-comparison of the voltage.

[0033] Mode switching circuit 3 is used to identify the state of single-pole double-throw switch and change the circuit's operating mode and the state of the mode indicator light.

[0034] The audible and visual alarm circuit 4 is used to emit a buzzer alarm and flash an indicator light when the water surface is detected in the still water level mode and when the water surface is detected in the discharge mode.

[0035] The drain control output circuit 5 is used to output an isolation shutdown signal to the well washing equipment when the water level is detected to be leaving the water surface in the drain mode.

[0036] In this scheme, the acquisition end of the voltage acquisition and comparison circuit 2 is connected to the probe and the sensitivity adjustment knob potentiometer. When the probe is inserted into the groundwater, the weak current output by the probe passes through the water body to form a voltage signal. After cross-comparison with a fixed threshold, a high-level signal and a low-level signal are output respectively. When the switch of the mode switching circuit 3 is in the still water level mode, the transistor switch is turned on, the audible and visual alarm circuit 4 is activated by the power of the battery 1, and a sharp buzzer alarm is emitted and the indicator light flashes continuously. When the switch of the mode switching circuit 3 is in the draining mode, the transistor switch is not turned on, the audible and visual alarm circuit 4 is not activated, and the mode indicator light will be lit through the XOR gate. When the probe leaves the groundwater, the two output signal levels of the voltage acquisition and comparison circuit 2 will automatically switch. In the still water level mode, the audible and visual alarm circuit 4 is not activated, and in the draining mode, the audible and visual alarm circuit 4 is activated. The mode indicator light will be lit through the XOR gate, and at the same time, the draining control output circuit 5 will output a shutdown signal to the well washing equipment to automatically stop the groundwater well washing operation.

[0037] For details, see Figure 2 The voltage acquisition and comparison circuit 2 includes probe J1, potentiometer J2, dual-channel differential comparator LM2903, resistors R1, R2, R3, R4, R7, R9, R12, and capacitors C1, C6, and C7. The positive terminal of probe J1 is filtered by C6 and then connected to pins 3 and 6 of the dual-channel differential comparator LM2903. Simultaneously, it is connected to the positive terminal of the power supply of battery 1 through series with R4 and R3. The negative terminal is connected to R7 and then connected in series with potentiometer J2 to the negative terminal of the power supply of battery 1. Pin 8 of the dual-channel differential comparator LM2903 is filtered by C1 and then connected to the positive terminal of the power supply of battery 1. Pin 4 is connected to the negative terminal of the power supply of battery 1. Pins 2 and 5 are filtered by C7 and then connected to the middle voltage divider point of R1 and R2 in the power supply circuit of battery 1. Pins 1 and 7 are pulled up to the positive terminal of the power supply of battery 1 through R9 and R12, respectively.

[0038] Further, see Figure 2 The mode switching circuit 3 includes a single-pole double-throw switch J5, a resistor R11, capacitors C5 and C8, an XOR gate CD4077, a first light-emitting diode J6, and a first transistor Q1. The common terminal of the single-pole double-throw switch is connected to pin 1 of the first transistor Q1 and pin 1 of the XOR gate CD4077. The normally open terminal is connected to pin 2 of the XOR gate CD4077 and pin 7 of the dual-channel differential comparator LM2903. The normally closed terminal is connected to pin 1 of the dual-channel differential comparator LM2903. Pin 3 of the XOR gate CD4077 is connected to R11 and then in series with the first light-emitting diode J6 to the negative terminal of the power supply of battery 1. Pin 14 is filtered by capacitor C5 and then connected to the positive terminal of the power supply of battery 1. Pin 7 is connected to the negative terminal of the power supply of battery 1. Capacitor C8 is connected in parallel with the first light-emitting diode J6. The first transistor Q1 is a PNP type, and pin 2 is connected to the positive terminal of the power supply of battery 1.

[0039] It is worth noting that, see Figure 3 The audible and visual alarm circuit 4 includes a timer NE555, capacitors C2, C3, C4, resistors R5, R6, R8, R10, a second transistor Q2, a second LED J3, and a buzzer J4. Pins 4 and 8 of the timer NE555 are filtered by C4 and then connected to pin 3 of the first transistor Q1 in the mode switching circuit 3. Pins 2 and 6 are connected to C2 and then to the negative terminal of the battery 1 power supply. Pin 5 is connected to C3 and then to the negative terminal of the battery 1 power supply. Pin 3 is connected to pin 1 of the second transistor Q2. Pin 7 is connected to R5 and R10. 6; The other end of resistor R5 is connected to pin 3 of the first transistor Q1 in mode switching circuit 3; the other end of resistor R6 is connected to pin 6 of timer NE555; the second transistor Q2 is NPN type, pin 2 is connected to the negative terminal of the power supply of battery 1, and pin 3 is connected to the negative terminal of the second LED J3; the positive terminal of the second LED J3 is connected to R8 and then to the positive terminal of the power supply of battery 1; the positive terminal of buzzer J4 is connected to R10 and then to pin 3 of the first transistor Q1 in mode switching circuit 3, and the negative terminal is connected to the negative terminal of the power supply of battery 1.

[0040] It is worth noting that, see Figure 4 The discharge control output circuit 5 includes a third transistor Q3, resistors R13 and R15, and an opto-MOS relay BCY412S. Pin 1 of the third transistor Q3 is connected to pin 3 of the XOR gate CD4077 of the mode switching circuit 3, pin 2 is connected to the negative terminal of the power supply of battery 1, and pin 3 is connected to R15 and then to the positive terminal of the power supply of battery 1. Pin 1 of the opto-MOS relay BCY412S is connected to R13 and then to pin 3 of the first transistor Q1 of the mode switching circuit 3, pin 2 is connected to pin 3 of the third transistor Q3, and pins 3 and 4 are connected to the output port, which is connected to the groundwater well washing equipment.

[0041] In addition, all components designed in this invention are general standard parts or components known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this invention does not involve improvements to the internal structure and method.

Claims

1. A groundwater level monitoring circuit, comprising a battery (1), a voltage acquisition and comparison circuit (2), a mode switching circuit (3), an audible and visual alarm circuit (4), and a discharge control output circuit (5), characterized in that, The battery (1) is a 9V lithium battery (1), which powers the voltage acquisition and comparison circuit (2), the sound and light alarm circuit (4) and the leakage control output circuit (5); The voltage acquisition and comparison circuit (2) is used to acquire the resistance value of groundwater and generate two opposite level signals by cross-comparison of the voltage. The mode switching circuit (3) is used to identify the state of the single-pole double-throw switch and change the working mode of the circuit and the state of the mode indicator light. The sound and light alarm circuit (4) is used to emit a buzzer alarm and flashing indicator light when the water surface is detected in the still water level mode and when the water surface is detected in the discharge mode. The drain control output circuit (5) is used to output an isolation shutdown signal to the well washing equipment when the drain mode detects that the water has left the water surface.

2. The groundwater level monitoring circuit of claim 1, wherein, The operating modes include two modes: still water level and discharge. The still water level mode is used to monitor whether the water touches the water surface, and the discharge mode is used to monitor whether the water leaves the water surface.

3. The groundwater level monitoring circuit as described in claim 1, characterized in that, The voltage acquisition and comparison circuit (2) includes probe J1, potentiometer J2, dual-channel differential comparator LM2903, resistors R1, R2, R3, R4, R7, R9, R12 and capacitors C1, C6, C7.

4. The groundwater level monitoring circuit of claim 3, wherein, The positive terminal of probe J1 is filtered by C6 and then connected to pins 3 and 6 of the dual-channel differential comparator LM2903. Simultaneously, it is connected to the positive terminal of the battery (1) power supply after being connected in series with R4 and R3. The negative terminal is connected to R7 and then connected in series with potentiometer J2 to the negative terminal of the battery (1) power supply. The 8th pin of the dual-channel differential comparator LM2903 is filtered by C1 and then connected to the positive terminal of the battery (1) power supply. The 4th pin is connected to the negative terminal of the battery (1) power supply. The 2nd and 5th pins are filtered by C7 and then connected to the middle voltage divider point of R1 and R2 in the battery (1) power supply circuit. The 1st and 7th pins are pulled up to the positive terminal of the battery (1) power supply through R9 and R12 respectively.

5. The groundwater level monitoring circuit of claim 1, wherein, The mode switching circuit (3) includes a single-pole double-throw switch J5, a resistor R11, a capacitor C5, a capacitor C8, an XOR gate CD4077, a first light-emitting diode J6, and a first transistor Q1.

6. The groundwater level monitoring circuit of claim 5, wherein, The common terminal of the single-pole double-throw switch is connected to pin 1 of the first transistor Q1 and pin 1 of the XOR gate CD4077. The normally open terminal is connected to pin 2 of the XOR gate CD4077 and pin 7 of the dual-channel differential comparator LM2903. The normally closed terminal is connected to pin 1 of the dual-channel differential comparator LM2903. Pin 3 of the XOR gate CD4077 is connected to R11 and then connected in series with the first light-emitting diode J6 to the negative terminal of the battery (1) power supply. Pin 14 is connected to the positive terminal of the battery (1) power supply after being filtered by capacitor C5. Pin 7 is connected to the negative terminal of the battery (1) power supply. The capacitor C8 is connected in parallel with the first light-emitting diode J6. The first transistor Q1 is a PNP type, and pin 2 is connected to the positive terminal of the battery (1) power supply.

7. The groundwater level monitoring circuit as described in claim 1, characterized in that, The sound and light alarm circuit (4) includes a timer NE555, capacitors C2, C3, C4, resistors R5, R6, R8, R10, a second transistor Q2, a second light-emitting diode J3, and a buzzer J4.

8. The groundwater level monitoring circuit as described in claim 7, characterized in that, The 4th and 8th pins of the timer NE555 are filtered by C4 and then connected to the 3rd pin of the first transistor Q1 of the mode switching circuit (3). The 2nd and 6th pins are connected to C2 and then to the negative terminal of the battery (1) power supply. The 5th pin is connected to C3 and then to the negative terminal of the battery (1) power supply. The 3rd pin is connected to the 1st pin of the second transistor Q2. The 7th pin is connected to R5 and R6. The other end of the resistor R5 is connected to the 3rd pin of the first transistor Q1 of the mode switching circuit (3). The other end of the resistor R6 is connected to the 6th pin of the timer NE555. The second transistor Q2 is an NPN type. The 2nd pin is connected to the negative terminal of the battery (1) power supply. The 3rd pin is connected to the negative terminal of the second light-emitting diode J3. The positive terminal of the second light-emitting diode J3 is connected to R8 and then to the positive terminal of the battery (1) power supply. The positive terminal of the buzzer J4 is connected to R10 and then to the 3rd pin of the first transistor Q1 of the mode switching circuit (3). The negative terminal is connected to the negative terminal of the battery (1) power supply.

9. The groundwater level monitoring circuit as described in claim 1, characterized in that, The bleed control output circuit (5) includes a third transistor Q3, resistors R13 and R15, and an optical MOS relay BCY412S.

10. The groundwater level monitoring circuit as described in claim 9, characterized in that, Pin 1 of the third transistor Q3 is connected to pin 3 of the XOR gate CD4077 of the mode switching circuit (3), pin 2 is connected to the negative terminal of the power supply of the battery (1), and pin 3 is connected to R15 and then to the positive terminal of the power supply of the battery (1); pin 1 of the optical MOS relay BCY412S is connected to R13 and then to pin 3 of the first transistor Q1 of the mode switching circuit (3), pin 2 is connected to pin 3 of the third transistor Q3, and pins 3 and 4 are connected to the output port and connected to the underground water washing equipment.

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