Low-power-consumption pipeline ultrasonic water level sensor

Abstract

The invention relates to the technical field of pipelines, and discloses a low-power-consumption pipeline ultrasonic water level sensor which comprises a water pipe, an ultrasonic water level monitoring module is arranged on the outer wall of the water pipe, a detection head is arranged in the ultrasonic water level monitoring module, and the outer wall of the detection head is arranged in the water pipe. A buffer plate is arranged in the water pipe, a buffer assembly is arranged on the outer wall of the buffer plate, a fixing column is arranged on the outer wall of the buffer assembly, the outer wall of the fixing column is fixedly connected to the interior of the water pipe, a connecting plate is fixedly connected to the outer wall of the buffer plate, and the outer wall of the connecting plate is slidably connected to the interior of the water pipe. According to the invention, when the buffer plate moves, the sliding column is driven to move so as to compress the spring, the connecting plate and the sliding groove are used for limiting the moving track of the buffer plate, and through compression of the spring, water flow is buffered during water injection, and the situation that the detection head is damaged and cannot work normally due to the fact that the water flow directly acts on the detection head is avoided.

Description

Technical Field

[0001] This invention relates to the field of pipeline technology, and more particularly to a low-power ultrasonic water level sensor for pipelines. Background Technology

[0002] A water level sensor is an instrument used to monitor the water level. It can convert the physical changes in water level into electrical signals or other measurable signals through various sensing technologies (such as pressure sensing, ultrasonic ranging, radar detection, float linkage, etc.), thereby realizing real-time detection and data output of water level.

[0003] Existing ultrasonic water level sensors typically support wireless data transmission, facilitating access to remote monitoring systems. However, during water injection, they cannot buffer the water flow, causing the water to directly impact the probe and damage it. Summary of the Invention

[0004] To overcome the above shortcomings, this invention provides a low-power ultrasonic water level sensor for pipelines, which aims to improve the problem that existing ultrasonic water level sensors cannot buffer the water flow during water injection, causing the water flow to directly impact the probe and thus damage the probe.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A low-power pipeline ultrasonic water level sensor includes a water pipe, an ultrasonic water level monitoring module is provided on the outer wall of the water pipe, a probe is provided inside the ultrasonic water level monitoring module, the outer wall of the probe is provided inside the water pipe, a buffer plate is provided inside the water pipe, a buffer assembly is provided on the outer wall of the buffer plate, a fixed column is provided on the outer wall of the buffer assembly, the outer wall of the fixed column is fixedly connected to the inside of the water pipe, a connecting plate is fixedly connected to the outer wall of the buffer plate, and the outer wall of the connecting plate is slidably connected to the inside of the water pipe; the ultrasonic water level monitoring module (2) includes an ultrasonic water level sensor, a data acquisition and preprocessing module, an AD conversion module, a microcontroller module, a data transmission module, a monitoring and early warning module, and a power supply module; Among them, the ultrasonic water level sensor is used to calculate the water level by emitting ultrasonic pulses and receiving echoes, and is used for real-time monitoring of the water level inside the tunnel. The data acquisition and preprocessing module is used to integrate and process the data from the ultrasonic water level sensor. The AD conversion module is used to convert the analog signal processed by the data acquisition and preprocessing module into a digital signal. The microcontroller module is used to transmit the digital signal processed by the data acquisition and preprocessing module to the monitoring and early warning module via a wireless network; The monitoring and early warning module is used to verify and process the received data, and then determine whether to trigger an alarm. The auxiliary unit is used to assist in water level measurement, ensuring the accuracy of water level measurement and improving measurement precision.

[0006] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, the buffer assembly includes a sliding column, the outer wall of the sliding column is fixedly connected to the outer wall of the buffer plate, the outer wall of the sliding column is provided with a spring, the outer wall of the sliding column is slidably connected to the inside of the fixed column, and the spring is provided inside the fixed column.

[0007] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, a sliding groove is provided inside the water pipe, and the connecting plate is slidably connected to the inside of the water pipe through the sliding groove.

[0008] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, the data acquisition and preprocessing module includes an amplification circuit and a dual operational amplifier bandpass filter. The amplification circuit is composed of an OPA277 operational amplifier and resistors and capacitors, which is used to amplify and filter the data acquired by the array sensor before inputting it into the signal conversion circuit, thereby greatly reducing signal noise and signal loss during measurement.

[0009] As a further preferred embodiment of the low-power ultrasonic water level sensor for pipelines of the present invention, the amplification circuit and dual operational amplifier bandpass filter include a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. The signal input -IN terminal is connected to one end of the first resistor; the other end of the first resistor is connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier; the other end of the first capacitor is connected to the other end of the third resistor and the output pin of the first operational amplifier; the signal input +IN terminal is connected to one end of the second resistor; and the other end of the second resistor is connected to the first operational amplifier... The positive power supply pin of the first operational amplifier is connected to one end of the fourth resistor and one end of the second capacitor. The other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to one end of the seventh resistor and the output pin of the second operational amplifier. The other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the third capacitor. The other end of the third capacitor is grounded.

[0010] As a further preferred embodiment of the low-power ultrasonic water level sensor for pipelines of the present invention, the spring is made of a nickel alloy.

[0011] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, a rotating component is provided inside the water pipe, a threaded block is provided on the outer wall of the rotating component, a cleaning ring is fixedly connected to the outer wall of the threaded block, a sliding component is provided on the outer wall of the cleaning ring, a support frame is provided on the outer wall of the sliding component, and the outer wall of the rotating component is located inside the support frame.

[0012] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, the rotating assembly includes a reciprocating lead screw, the outer wall of which is rotatably connected to the inside of the water pipe, a cross plate is fixedly connected to the top end of the reciprocating lead screw, the internal thread of the threaded block is threadedly connected to the outer wall of the reciprocating lead screw, and the outer wall of the reciprocating lead screw is rotatably connected to the inside of the support frame.

[0013] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, the sliding component includes a connecting column, the outer wall of the connecting column is fixedly connected to the outer wall of the cleaning ring, a limiting column is slidably connected inside the connecting column, the outer wall of the limiting column is fixedly connected to the inside of the support frame, and the outer wall of the limiting column is fixedly connected to the inside of the water pipe.

[0014] As a further preferred embodiment of the low-power pipeline ultrasonic water level sensor of the present invention, the inside of the cleaning ring is disposed on the outer wall of the probe head, and the outer wall of the support frame is fixedly connected to the inside of the water pipe.

[0015] The present invention has the following beneficial effects: This invention relates to a low-power pipeline ultrasonic water level sensor and its ultrasonic water level monitoring module. The ultrasonic water level sensor performs real-time monitoring of the environment inside the tunnel. It calculates the water level height by emitting ultrasonic pulses and receiving echoes. The acquired analog signals are transmitted to a data acquisition and preprocessing module for processing, converting the analog signals into digital signals and filtering out noise to reduce interference. The processed digital signals are then transmitted wirelessly or via wired connection to a monitoring and early warning module. This module performs in-depth analysis of the received data and calculates based on program instructions to determine the presence of potential threats and anomalies. When potential threats or anomalies are detected, an alarm is triggered. This system utilizes the ultrasonic water level sensor for ultrasonic measurement of water level height. The measurement data is stable and reliable, unaffected by light, and maintains measurement stability in various environments, effectively improving data accuracy, reducing false alarms, and enhancing equipment reliability. This invention relates to a low-power ultrasonic water level sensor for pipelines. During water injection, the water flow first contacts a buffer plate, which then moves the buffer plate. The movement of the buffer plate causes the sliding column to move, thereby compressing the spring. The connecting plate and the sliding groove limit the movement trajectory of the buffer plate. By compressing the spring, the water flow is buffered during water injection, preventing the water flow from directly acting on the probe and causing damage to the probe, thus preventing it from working properly.

[0016] 3. The low-power ultrasonic water level sensor for pipelines of this invention drives the reciprocating lead screw to rotate by rotating the cross plate, which in turn drives the threaded block to move. The cleaning ring moves under the drive of the threaded block, thereby realizing automatic cleaning of the probe head and avoiding the effect of impurities adhering to the probe head surface after long-term use, which leads to inaccurate data collection. Attached Figure Description

[0017] Figure 1This is a three-dimensional structural diagram of the low-power pipeline ultrasonic water level sensor proposed in this invention. Figure 2 This is a schematic diagram of the ultrasonic water level monitoring module of the low-power pipeline ultrasonic water level sensor proposed in this invention. Figure 3 This is a circuit diagram of the data acquisition and preprocessing module of the low-power pipeline ultrasonic water level sensor proposed in this invention. Figure 4 This is a schematic diagram of a partial cross-plate structure of the low-power ultrasonic water level sensor for pipelines proposed in this invention. Figure 5 This is a schematic diagram of a partial structure of the sliding column of the low-power ultrasonic water level sensor for pipelines proposed in this invention. Figure 6 This is a schematic diagram of a partial spring structure of the low-power ultrasonic water level sensor for pipelines proposed in this invention. Figure 7 This is a partial structural diagram of the cleaning ring of the low-power pipeline ultrasonic water level sensor proposed in this invention.

[0018] Legend: 1. Water pipe; 2. Ultrasonic water level monitoring module; 3. Buffer plate; 4. Sliding column; 5. Spring; 6. Fixed column; 7. Connecting plate; 8. Slide groove; 9. Reciprocating screw; 10. Cross plate; 11. Threaded block; 12. Cleaning ring; 13. Connecting column; 14. Limiting column; 15. Support frame; 16. Probe head. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figures 1-7 An embodiment of the present invention provides a low-power pipeline ultrasonic water level sensor, including a water pipe 1, an ultrasonic water level monitoring module 2 disposed on the outer wall of the water pipe 1, a probe 16 disposed inside the ultrasonic water level monitoring module 2, the outer wall of the probe 16 disposed inside the water pipe 1, a buffer plate 3 disposed inside the water pipe 1, a buffer assembly disposed on the outer wall of the buffer plate 3, a fixing post 6 disposed on the outer wall of the buffer assembly, the outer wall of the fixing post 6 being fixedly connected to the inside of the water pipe 1, and a connecting plate 7 being fixedly connected to the outer wall of the buffer plate 3, the outer wall of the connecting plate 7 being slidably connected to the inside of the water pipe 1. like Figure 2As shown, the ultrasonic water level monitoring module 2 includes an ultrasonic water level sensor, a data acquisition and preprocessing module, an AD conversion module, a microcontroller module, a data transmission module, a monitoring and early warning module, and a power supply module. Among them, the ultrasonic water level sensor is used to calculate the water level by emitting ultrasonic pulses and receiving echoes, and is used for real-time monitoring of the water level inside the tunnel. The data acquisition and preprocessing module is used to integrate and process the data from the ultrasonic water level sensor. The AD conversion module is used to convert the analog signal processed by the data acquisition and preprocessing module into a digital signal. The microcontroller module is used to transmit the digital signal processed by the data acquisition and preprocessing module to the monitoring and early warning module via a wireless network; The monitoring and early warning module is used to verify and process the received data, and then determine whether to trigger an alarm. The auxiliary unit is used to assist in water level measurement, ensuring the accuracy of water level measurement and improving measurement precision.

[0021] like Figure 3As shown, the data acquisition and preprocessing module includes an amplification circuit and a dual operational amplifier bandpass filter. The amplification circuit, composed of an OPA277 operational amplifier and resistors and capacitors, amplifies and filters the data acquired by the array sensor before inputting it to the signal conversion circuit, significantly reducing signal noise and signal loss during measurement. The amplification circuit and dual operational amplifier bandpass filter include a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. The signal input -IN terminal is connected to one end of the first resistor; the other end of the first resistor is connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier; the other end of the first capacitor is connected to the other end of the third resistor and the output pin of the first operational amplifier; the signal input +IN terminal is connected to one end of the second resistor; the other end of the second resistor is connected to the positive power supply pin of the first operational amplifier and the fourth resistor. One end of the first operational amplifier is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor, respectively. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to one end of the seventh resistor and the output pin of the second operational amplifier, respectively. The other end of the seventh resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to one end of the ninth resistor, respectively. The other end of the ninth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded. The amplifier circuit and the dual operational amplifier bandpass filter amplify and filter the data acquired by the array sensor before inputting it to the signal conversion circuit, greatly reducing signal noise and signal loss in the measurement. The amplifier circuit consists of an OPA277 operational amplifier and resistors and capacitors. This circuit is a typical differential amplifier circuit. At the same time, C3 and R6, and C4 and R7 form a low-pass filter. A dual op-amp bandpass filter is constructed using two OPA277 operational amplifiers. The Q value and center frequency of this bandpass filter are adjustable. Adjusting R9 adjusts the resonant frequency, and adjusting R8 adjusts the Q value. Notably, after acquiring the gas signal parameters, a multiplexed analog switch selects the output to the signal processing circuit before inputting it to an AD7794 for digital-to-analog conversion, transforming the analog signal into a digital signal. This facilitates long-distance wireless signal transmission.

[0022] Specifically, when water flows into the water pipe 1, it first contacts the buffer plate 3, which then moves the buffer plate 3. When the buffer plate 3 moves, the buffer plate 3 and the buffer assembly are fixed together, causing the buffer assembly to slide inside the fixed column 6. When the buffer plate 3 moves, the buffer plate 3 and the connecting plate 7 are fixed together, causing the connecting plate 7 to move. Through the cooperation between the buffer plate 3, the buffer assembly, the fixed column 6 and the connecting plate 7, the direct impact of water flow on the probe 16 is avoided, which could damage the probe 16, while also improving the accuracy of the detection.

[0023] Reference Figures 4-6 The buffer assembly includes a sliding column 4, the outer wall of which is fixedly connected to the outer wall of the buffer plate 3. A spring 5 is provided on the outer wall of the sliding column 4. The outer wall of the sliding column 4 is slidably connected to the inside of the fixed column 6. The spring 5 is located inside the fixed column 6. A groove 8 is provided inside the water pipe 1. The connecting plate 7 is slidably connected to the inside of the water pipe 1 through the groove 8. The spring 5 is made of nickel alloy. Specifically, when the buffer plate 3 moves, the fixed action of the buffer plate 3 and the sliding column 4 will drive the sliding column 4 to move. When the sliding column 4 moves, it will cooperate with the fixed column 6 to compress the spring 5. The groove 8 is used to limit the movement trajectory of the connecting plate 7, thereby improving the stability of the connecting plate 7 when it moves. Through the excellent toughness and fatigue resistance of the nickel alloy itself, the spring 5 can still have good elastic potential energy after long-term use.

[0024] Reference Figure 1 , Figure 6 and Figure 7 The water pipe 1 has a rotating assembly inside, with a threaded block 11 on its outer wall. A cleaning ring 12 is fixedly connected to the outer wall of the threaded block 11. A sliding assembly is provided on the outer wall of the cleaning ring 12, and a support frame 15 is provided on the outer wall of the sliding assembly. The outer wall of the rotating assembly is located inside the support frame 15. The rotating assembly includes a reciprocating screw 9, whose outer wall is rotatably connected to the inside of the water pipe 1. A cross plate 10 is fixedly connected to the top of the reciprocating screw 9. The threaded block 11 is threadedly connected to the outer wall of the reciprocating screw 9, and the outer wall of the reciprocating screw 9 is rotatably connected to the inside of the support frame 15. The sliding assembly includes a connecting post 13, whose outer wall is fixedly connected to the outer wall of the cleaning ring 12. A limiting post 14 is slidably connected inside the connecting post 13. The outer wall of the limiting post 14 is fixedly connected to the inside of the support frame 15, and the outer wall of the limiting post 14 is fixedly connected to the inside of the water pipe 1. The cleaning ring 12 is located on the outer wall of the probe head 16, and the outer wall of the support frame 15 is fixedly connected to the inside of the water pipe 1. Specifically, by rotating the cross plate 10, the reciprocating screw 9 is driven to rotate, which in turn drives the threaded block 11 to move up and down reciprocally. When the threaded block 11 moves, the cleaning ring 12 is driven to move by the fixing action of the threaded block 11 and the cleaning ring 12. The connecting column 13 and the limiting column 14 cooperate with each other to support the movement of the cleaning ring 12, thereby improving the stability of the cleaning ring 12 during movement. Through the movement of the cleaning ring 12, the probe head 16 is automatically cleaned, avoiding the effect of impurities covering the surface of the probe head 16 and causing a decrease in detection accuracy.

[0025] Working Principle: The ultrasonic water level sensor monitors the tunnel's internal environment in real time. It calculates the water level by emitting ultrasonic pulses and receiving echoes. The collected analog signals are transmitted to the data acquisition and preprocessing module for processing, converting them into digital signals and filtering out noise to reduce interference. The processed digital signals are then transmitted wirelessly or via wired to the monitoring and early warning module. This module performs in-depth analysis of the received data and calculates based on program instructions to determine the presence of potential threats and anomalies. An alarm is triggered when potential threats or anomalies are detected. This system utilizes the ultrasonic water level sensor for ultrasonic measurement of water level, providing stable and reliable data unaffected by light conditions. It maintains measurement stability in various environments, effectively improving data accuracy, reducing false alarms, and enhancing equipment reliability.

[0026] When water flows into water pipe 1, it first impacts buffer plate 3, causing it to slide sliding column 4 inside fixed column 6, further compressing spring 5. While buffer plate 3 moves, it also drives connecting plate 7 to move inside water pipe 1 through sliding groove 8. Through the combined action of buffer plate 3 and spring 5, the effect of preventing water flow from impacting probe head 16 and causing damage to probe head 16 is achieved. Rotating the cross plate 10 drives the reciprocating screw 9 to rotate, which in turn causes the threaded block 11 to drive the cleaning ring 12 to move up and down on the outer wall of the probe head 16. The connecting column 13, the limiting column 14, and the support frame 15 work together to improve the stability of the cleaning ring 12 during movement. By automatically cleaning the probe head 16 with the cleaning ring 12, the effect of avoiding impurities adhering to the surface of the probe head 16 and causing inaccurate data collection can be achieved.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-power ultrasonic water level sensor for pipelines, comprising a water pipe (1), characterized in that: An ultrasonic water level monitoring module (2) is provided on the outer wall of the water pipe (1). A probe (16) is provided inside the ultrasonic water level monitoring module (2). The outer wall of the probe (16) is located inside the water pipe (1). A buffer plate (3) is provided inside the water pipe (1). A buffer assembly is provided on the outer wall of the buffer plate (3). A fixing column (6) is provided on the outer wall of the buffer assembly. The outer wall of the fixing column (6) is fixedly connected to the inside of the water pipe (1). A connecting plate (7) is fixedly connected to the outer wall of the buffer plate (3). The outer wall of the connecting plate (7) is slidably connected to the inside of the water pipe (1). The ultrasonic water level monitoring module (2) includes an ultrasonic water level sensor, a data acquisition and preprocessing module, an AD conversion module, a microcontroller module, a data transmission module, a monitoring and early warning module, and a power supply module. Among them, the ultrasonic water level sensor is used to calculate the water level by emitting ultrasonic pulses and receiving echoes, and is used for real-time monitoring of the water level inside the tunnel. The data acquisition and preprocessing module is used to integrate and process the data from the ultrasonic water level sensor. The AD conversion module is used to convert the analog signal processed by the data acquisition and preprocessing module into a digital signal. The microcontroller module is used to transmit the digital signal processed by the data acquisition and preprocessing module to the monitoring and early warning module via a wireless network; The monitoring and early warning module is used to verify and process the received data, and then determine whether to trigger an alarm. The auxiliary unit is used to assist in water level measurement, ensuring the accuracy of water level measurement and improving measurement precision.

2. The low-power ultrasonic water level sensor for pipelines according to claim 1, characterized in that: The buffer assembly includes a sliding column (4), the outer wall of which is fixedly connected to the outer wall of the buffer plate (3), a spring (5) is provided on the outer wall of the sliding column (4), the outer wall of which is slidably connected to the inside of the fixed column (6), and the spring (5) is provided inside the fixed column (6).

3. The low-power ultrasonic water level sensor for pipelines according to claim 1, characterized in that: The water pipe (1) has a groove (8) inside, and the connecting plate (7) is slidably connected to the inside of the water pipe (1) through the groove (8).

4. The low-power ultrasonic water level sensor for pipelines according to claim 2, characterized in that: The data acquisition and preprocessing module includes an amplifier circuit and a dual operational amplifier bandpass filter. The amplifier circuit consists of an OPA277 operational amplifier and resistors and capacitors, which amplifies and filters the data acquired by the array sensor before inputting it into the signal conversion circuit, greatly reducing signal noise and signal loss during measurement.

5. The low-power ultrasonic water level sensor for pipelines according to claim 4, characterized in that: The amplifier circuit and dual operational amplifier bandpass filter include a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first operational amplifier, a second operational amplifier, and a third operational amplifier. The signal input -IN terminal is connected to one end of the first resistor. The other end of the first resistor is connected to one end of the first capacitor, one end of the third resistor, and the negative power supply pin of the first operational amplifier. The other end of the first capacitor is connected to the other end of the third resistor and the output pin of the first operational amplifier. The signal input +IN terminal is connected to one end of the second resistor. The other end of the second resistor is connected to the positive power supply pin of the first operational amplifier and the fourth resistor. One end of the first operational amplifier is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the other end of the fourth resistor and grounded. The output pin of the first operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the positive power supply pin of the second operational amplifier. The negative power supply pin of the second operational amplifier is connected to the negative power supply pin of the third operational amplifier. The positive power supply pin of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor, and the other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to one end of the seventh resistor and the output pin of the second operational amplifier, and the other end of the seventh resistor is connected to one end of the fourth capacitor. The other end of the fourth capacitor is connected to one end of the ninth resistor, and the other end of the ninth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded.

6. The low-power ultrasonic water level sensor for pipelines according to claim 2, characterized in that: The spring (5) is made of nickel alloy.

7. The low-power ultrasonic water level sensor for pipelines according to claim 1, characterized in that: The water pipe (1) is provided with a rotating component inside. The outer wall of the rotating component is provided with a threaded block (11). The outer wall of the threaded block (11) is fixedly connected with a cleaning ring (12). The outer wall of the cleaning ring (12) is provided with a sliding component. The outer wall of the sliding component is provided with a support frame (15). The outer wall of the rotating component is located inside the support frame (15).

8. The low-power ultrasonic water level sensor for pipelines according to claim 7, characterized in that: The rotating assembly includes a reciprocating screw (9), the outer wall of which is rotatably connected to the inside of the water pipe (1), a cross plate (10) is fixedly connected to the top of the reciprocating screw (9), the internal thread of the threaded block (11) is connected to the outer wall of the reciprocating screw (9), and the outer wall of the reciprocating screw (9) is rotatably connected to the inside of the support frame (15).

9. The low-power ultrasonic water level sensor for pipelines according to claim 8, characterized in that: The sliding assembly includes a connecting column (13), the outer wall of which is fixedly connected to the outer wall of the cleaning ring (12), and a limiting column (14) is slidably connected inside the connecting column (13). The outer wall of the limiting column (14) is fixedly connected to the inside of the support frame (15), and the outer wall of the limiting column (14) is fixedly connected to the inside of the water pipe (1).

10. The low-power ultrasonic water level sensor for pipelines according to claim 9, characterized in that: The cleaning ring (12) is located inside the outer wall of the probe head (16), and the outer wall of the support frame (15) is fixedly connected to the inside of the water pipe (1).

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