Liquid flow detection device

Abstract

The utility model discloses a liquid flow detection device, and relates to the technical field of detection devices. The flow detection device comprises a pulse type liquid flow sensing module which is used for sensing and outputting a liquid flow signal; the signal coupling module is used for receiving and coupling the liquid flow signal and outputting a coupled pulse signal; the waveform shaping module is used for shaping the coupling pulse signal and outputting a one-way coupling pulse signal with one-way pulsation; the reference signal output module is used for outputting a liquid flow reference signal; the signal comparison module is used for comparing the one-way coupling pulse signal with the liquid flow reference signal and outputting a comparison signal; and the detection module is used for outputting a liquid flow detection result according to the comparison signal. Liquid flow signals output by the pulse type liquid flow sensing module only comprise coupling pulse signals after passing through the signal coupling module, the design difficulty of a detection circuit is simplified, and meanwhile the stability and accuracy of liquid flow detection are enhanced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of detection devices, and in particular to a liquid flow detection device. Background Art

[0002] Liquid flow detection devices play a vital role in industrial and laboratory applications, used to monitor liquid flow and provide accurate data support.

[0003] Current liquid flow detection devices typically use a magnetic reed switch. During flow detection, liquid passing through pushes a small magnet toward the reed switch. When the magnet reaches the magnetic sensing position, the reed switch closes and outputs a switching signal. However, this liquid flow detection solution suffers from large measurement errors. The assembly position and angle of the liquid flow switch significantly influence the measurement results, easily leading to false detections.

[0004] To address the technical issue of large detection errors in magnetic reed switch-type liquid flow switches, liquid flow detection devices can utilize pulsed liquid flow sensors and utilize a single-chip microcomputer for signal sampling and identification. The microcontroller receives the pulse signals output by the sensor and processes them to generate flow rate data. However, the inclusion of a microcontroller in existing liquid flow detection devices results in high material and maintenance costs. Furthermore, the microcontroller's stability and reliability may be challenged in high-frequency environments. Utility Model Content

[0005] The utility model provides a liquid flow detection device to simplify the design difficulty of the detection circuit, overcome the problem of large detection error existing in the traditional magnetic reed tube type liquid flow switch, and enhance the accuracy of liquid flow detection.

[0006] The first aspect of the present invention provides a liquid flow detection device, comprising:

[0007] A pulsed liquid flow sensor module is provided in the circuit between the liquid inlet and the liquid outlet, and is used to sense and output a liquid flow signal;

[0008] a signal coupling module connected to the pulsed liquid flow sensing module, configured to receive and couple the liquid flow signal and output a coupled pulse signal;

[0009] a waveform shaping module, connected to the signal coupling module, for shaping the coupled pulse signal and outputting a unidirectional coupled pulse signal with unidirectional pulsation;

[0010] Reference signal output module, used for outputting liquid flow reference signal;

[0011] a signal comparison module, connected to the waveform shaping module and the reference signal output module respectively, for comparing the unidirectional coupled pulse signal with the liquid flow reference signal and outputting a comparison signal;

[0012] The detection module is connected to the signal comparison module and is used to output a liquid flow detection result according to the comparison signal.

[0013] Optionally, the liquid flow detection device further includes:

[0014] The filtering and level conversion module is provided in the circuit between the signal comparison module and the detection module, and is used for filtering and level converting the comparison signal to obtain a liquid flow status signal, and outputting the liquid flow status signal to the detection module.

[0015] Optionally, the signal comparison module includes:

[0016] a filtering unit, configured to filter the unidirectionally pulsating unidirectional coupled pulse signal output by the waveform shaping module and output a DC signal;

[0017] The comparison unit includes a first signal input terminal and a second signal input terminal, wherein the first signal input terminal is connected to the output terminal of the filtering unit, and the second signal input terminal is connected to the output terminal of the reference signal output module, and is used to compare the DC signal with the liquid flow reference signal and output a comparison signal.

[0018] Optionally, the signal coupling module includes a first capacitor;

[0019] The first end of the first capacitor is connected to the output end of the pulse liquid flow sensor module, and the second end of the first capacitor is connected to the input end of the waveform shaping module.

[0020] Optionally, the waveform shaping module includes: a second capacitor, a first resistor, a first diode and a first transistor;

[0021] The first end of the second capacitor, the first end of the first resistor, and the positive electrode of the first diode serve as the input end of the waveform shaping module and are all connected to the base of the first transistor. The second end of the second capacitor, the second end of the first resistor, and the negative electrode of the first diode are all grounded. The collector of the first transistor is connected to the power signal end, and the emitter of the first transistor is grounded. The emitter of the first transistor is the output end of the waveform shaping module.

[0022] Optionally, the waveform shaping module further includes: a second resistor, a third resistor and a fourth resistor;

[0023] The first end of the second resistor and the first end of the third resistor are both connected to the input end of the waveform shaping module; the second end of the second resistor is grounded, and the second end of the third resistor is connected to the base of the first transistor; the fourth resistor is arranged in the circuit between the emitter of the first transistor and the ground end.

[0024] Optionally, the reference signal output module includes: a three-terminal voltage regulator, a fifth resistor and a sixth resistor;

[0025] The first pin of the three-terminal regulator is connected to the first end of the fifth resistor, serving as the output end of the reference signal output module; the second pin of the three-terminal regulator is connected to the second end of the fifth resistor and the first end of the sixth resistor; the third pin of the three-terminal regulator and the second end of the sixth resistor are both grounded.

[0026] Optionally, the reference signal output module further includes: a seventh resistor and a third capacitor;

[0027] The first end of the seventh resistor is connected to the power signal end, the second end of the seventh resistor and the first end of the third capacitor are both connected to the first pin of the three-terminal regulator, and the second end of the third capacitor is grounded.

[0028] Optionally, the filtering unit includes: a second diode, a fourth capacitor, an eighth resistor and a ninth resistor;

[0029] The anode of the second diode is connected to the output end of the waveform shaping module, the cathode of the second diode, the first end of the fourth capacitor, and the first end of the eighth resistor are all connected to the first signal input end; the second end of the fourth capacitor and the second end of the eighth resistor are both grounded; and the ninth resistor is arranged in the circuit between the cathode of the second diode and the first signal input end;

[0030] The comparison unit includes: an operational amplifier, a tenth resistor, and an eleventh resistor;

[0031] The opposite-name terminal of the operational amplifier is connected to the first signal input terminal, the same-name terminal of the operational amplifier is connected to the second signal input terminal, and the output terminal of the operational amplifier is the output terminal of the signal comparison module; the first end of the tenth resistor is connected to the output terminal of the reference signal output module, the second end of the tenth resistor and the first end of the eleventh resistor are both connected to the second signal input terminal, and the second end of the eleventh resistor is connected to the output terminal of the operational amplifier.

[0032] Optionally, the filtering and level conversion module includes: a twelfth resistor, a fifth capacitor, a third diode, a thirteenth resistor, a second transistor and a fourteenth resistor;

[0033] The first end of the twelfth resistor is connected to the output end of the signal comparison module; the second end of the twelfth resistor, the first end of the fifth capacitor, the cathode of the third diode and the first end of the thirteenth resistor are all connected to the base of the second transistor, the second end of the fifth capacitor, the anode of the third diode, the second end of the thirteenth resistor and the emitter of the second transistor are all grounded; the first end of the fourteenth resistor is connected to the power signal end, and the second end of the fourteenth resistor is connected to the collector of the second transistor; the collector of the second transistor is connected to the detection module.

[0034] The liquid flow detection device provided by the present invention includes a pulsed liquid flow sensor module, a signal coupling module and a waveform shaping module. Through the cooperation of the pulsed liquid flow sensor module, the signal coupling module and the waveform shaping module, it can be ensured that the signal output after the signal coupling module and the waveform shaping module is a unidirectional coupled pulse signal with unidirectional pulsation, which is convenient for subsequent comparison and analysis with the reference signal. Furthermore, the liquid flow detection device also includes a reference signal output module, a signal comparison module and a detection module. The detection module determines the liquid flow detection result according to the comparison result output by the signal comparison module. The technical solution provided by the present invention enables the liquid flow signal output by the pulsed liquid flow sensor module, which includes three state levels, to only include a coupled pulse signal after passing through the signal coupling module, making it more suitable for subsequent data processing and analysis, simplifying the design difficulty of the detection circuit, and enhancing the stability and accuracy of the liquid flow detection.

[0035] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of a liquid flow detection device provided in an embodiment of the present utility model;

[0038] Figure 2 A schematic structural diagram of another liquid flow detection device provided in an embodiment of the present utility model;

[0039] Figure 3This is a circuit connection diagram of a liquid flow detection device provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0040] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Figure 1 A schematic diagram of the structure of a liquid flow detection device provided by an embodiment of the present utility model is shown as follows: Figure 1 As shown, the liquid flow detection device includes a pulse liquid flow sensing module 1, which is arranged in a loop between the liquid inlet 01 and the liquid outlet 02, and is used to sense and output a liquid flow signal; a signal coupling module 2, which is connected to the pulse liquid flow sensing module 1, and is used to receive and couple the liquid flow signal and output a coupled pulse signal; a waveform shaping module 3, which is connected to the signal coupling module 2, and is used to shape the coupled pulse signal and output a unidirectional coupled pulse signal with unidirectional pulsation; a reference signal output module 4, which is used to output a liquid flow reference signal; a signal comparison module 5, which is respectively connected to the waveform shaping module 3 and the reference signal output module 4, and is used to compare the unidirectional coupled pulse signal and the liquid flow reference signal and output a comparison signal; a detection module 6, which is connected to the signal comparison module 5, and is used to output a liquid flow detection result according to the comparison signal.

[0043] Among them, the pulse liquid flow sensor module 1 can be specifically understood as a device that responds to the size of liquid flow through a pulse signal. Its working principle is that when the liquid flows through the sensor, a specific mechanism inside the sensor will measure the liquid flow and convert the amount of liquid flowing through into a pulse signal output. The generation of each pulse signal is associated with a certain amount of liquid passing through the sensor. Therefore, by calculating the frequency or number of pulse signals, the size of the liquid flow can be accurately inferred.

[0044] Specifically, the pulse liquid flow sensor module 1 takes a Hall pulse liquid flow sensor as an example to illustrate the technical solution of the embodiment of the utility model. The Hall pulse liquid flow sensor is set in the loop between the liquid inlet 01 and the liquid outlet 02. When the liquid flows between the liquid inlet 01 and the liquid outlet 02, it drives the water wheel in the Hall pulse liquid flow sensor to rotate. When the small magnet on the water wheel rotates, it periodically triggers the Hall chip to respond, thereby converting the speed of the liquid flow between the liquid inlet 01 and the liquid outlet 02 into the speed of the liquid flow signal output by the Hall pulse liquid flow sensor. According to the formula liquid flow Q = V * S (where Q is the liquid flow, V is the flow velocity of the liquid, and S is the cross-sectional area of ​​the fluid), when the cross-sectional area S of the fluid is constant, the size of the liquid flow Q is proportional to the speed of the liquid flow velocity V, that is, the size of the liquid flow between the liquid inlet 01 and the liquid outlet 02 is proportional to the speed of the liquid flow signal output by the Hall pulse liquid flow sensor. Therefore, by detecting the liquid flow signal output by the Hall pulse liquid flow sensor, the size of the liquid flow can be accurately reflected, which helps to accurately measure the liquid flow and improves the sensitivity of the liquid flow detection device.

[0045] Continue to refer Figure 1 As shown, the liquid flow detection device further includes a signal coupling module 2 connected to the pulse liquid flow sensing module 1, for receiving and coupling the liquid flow signal and outputting a coupled pulse signal.

[0046] Among them, the signal coupling module 2 can be specifically understood as a device that can identify the DC component in the liquid flow signal output by the liquid pulse liquid flow sensor module 1 through a specific circuit design, filter it out, and only retain the AC part, that is, the coupled pulse signal part.

[0047] Specifically, the initial position of the magnet on the water wheel in the Hall pulse liquid flow sensor is random. When the water wheel rotates normally, the liquid flow signal output by the Hall pulse liquid flow sensor is a pulse signal. When the position of the magnet on the water wheel makes the magnetic field when the liquid flows unable to activate the Hall pulse liquid flow sensor, the liquid flow signal output by the Hall pulse liquid flow sensor is a continuous low-level signal. Conversely, when the position of the magnet on the water wheel makes the magnetic field when the liquid flows continuously activate the Hall pulse liquid flow sensor, the liquid flow signal output by the Hall pulse liquid flow sensor is a continuous high-level signal. Therefore, the liquid flow of the Hall pulse type The liquid flow signal output by the sensor has three levels: a continuous low-level signal, a continuous high-level signal, and a pulse signal. The low-level signal and the high-level signal may interfere with subsequent signal processing and analysis. Therefore, the signal coupling module 2 is connected to the pulse liquid flow sensing module 1 to filter out the DC component in the liquid flow signal, i.e., the continuous low-level signal and the continuous high-level signal, and only retain the AC part in the liquid flow signal, i.e., the pulse signal. The coupled pulse signal processed in this way ensures the accuracy and stability of the liquid flow signal, making it more suitable for subsequent data processing and analysis, thereby improving the stability and reliability of the liquid flow detection device.

[0048] Continue to refer Figure 1 As shown, the liquid flow detection device further includes a waveform shaping module 3, which is connected to the signal coupling module 2 and is used to shape the coupled pulse signal and output a unidirectional coupled pulse signal with unidirectional pulsation.

[0049] Among them, the waveform shaping module 3 can be specifically understood as shaping the coupled pulse signal output by the signal coupling module 2 through a specific circuit design, so that after the coupled pulse signal passes through the waveform shaping model 3, the output signal is a unidirectional coupled pulse signal with unidirectional pulsation, that is, the output signal only contains a pulse signal in the positive direction and a zero signal.

[0050] Specifically, the waveform shaping module 3 shapes the coupled pulse signal output by the signal coupling module 2, which only includes pulse signals, into a unidirectional coupled pulse signal with unidirectional pulsation that only includes positive direction pulse signals and zero signals. This helps to standardize the waveform of the output signal, making it easier to process and analyze, while reducing possible noise interference, improving the clarity and stability of the signal, and thus improving the stability and reliability of the flow detection device.

[0051] Continue to refer Figure 1 As shown, the liquid flow detection device further includes a reference signal output module 4 for outputting a liquid flow reference signal.

[0052] Specifically, reference signal output module 4 can be understood as a device that, through a specific circuit design, provides a stable reference signal representing the liquid flow rate under standard conditions. Specifically, the liquid flow reference signal output by reference signal output module 4 can serve as a benchmark for calibrating and calibrating a liquid flow detection device. By comparing and analyzing the signal with the actual detected liquid flow signal, anomalies in the liquid flow rate can be better understood, allowing for timely identification and implementation of appropriate measures, thereby improving the stability and reliability of the liquid flow monitoring device.

[0053] Continue to refer Figure 1 As shown, the liquid flow detection device further includes a signal comparison module 5, which is connected to the waveform shaping module 3 and the reference signal output module 4 respectively, and is used to compare the unidirectional coupled pulse signal and the liquid flow reference signal and output a comparison signal.

[0054] Specifically, signal comparison module 5 receives the unidirectional coupled pulse signal output by waveform shaping module 3 based on the actual measured liquid flow rate and the liquid flow reference signal output by reference signal output module 4, representing the liquid flow rate under standard conditions. After comparing and analyzing the two signals, signal comparison module 5 outputs a comparison signal indicating the difference between the two signals. Based on the comparison signal, the liquid flow detection device can accurately monitor and analyze liquid flow rates. When abnormal liquid flow rates are detected, the device can promptly identify the problem and take appropriate measures, thereby improving the stability and reliability of the liquid flow detection device.

[0055] For example, when the unidirectional coupling pulse signal is greater than the liquid flow reference signal, the signal comparison module 5 will output a low-level comparison signal after comparison and analysis, which is used to represent that the liquid flow between the liquid inlet 01 and the liquid outlet 02 is normal at this time; when the unidirectional coupling pulse signal is less than the liquid flow reference signal, the signal comparison module 5 will output a high-level comparison signal after comparison and analysis, which is used to represent that the liquid flow between the liquid inlet 01 and the liquid outlet 02 is abnormal at this time, and the water flow in the water circuit formed by the liquid inlet 01 and the liquid outlet 02 is insufficient, and the water flow needs to be adjusted in time.

[0056] Continue to refer Figure 1 As shown, the liquid flow detection device further includes a detection module 6 connected to the signal comparison module 5, and configured to output a liquid flow detection result according to the comparison signal.

[0057] Specifically, detection module 6 performs further analysis and processing based on the comparison signal output by signal comparison module 5 after comparing and analyzing the unidirectional coupled pulse signal and the flow reference signal, to determine whether the liquid flow rate meets the standard flow rate and output a liquid flow rate detection result. Detection module 6 can provide real-time feedback on the liquid flow rate detection result based on the comparison signal, thereby monitoring changes in the liquid flow rate in real time, promptly detecting anomalies and taking necessary measures to ensure stable operation of the liquid flow detection device and that the water flow rate meets the specified flow rate requirements.

[0058] For example, when the reference signal output by the signal comparison module 5 is a low-level signal, indicating that the liquid flow rate between the liquid inlet 01 and the liquid outlet 02 is normal at this time, the detection module 6 will output a judgment result that the liquid flow condition is normal after analysis and processing based on the low-level signal; when the reference signal output by the signal comparison module 5 is a high-level signal, indicating that the liquid flow rate between the liquid inlet 01 and the liquid outlet 02 is abnormal at this time, and the water flow rate of the water circuit formed by the liquid inlet 01 and the liquid outlet 02 is insufficient, the detection module 6 will output a judgment result that the liquid flow rate condition is abnormal after analysis and processing based on the high-level signal, and remind the operator to adjust the water flow rate in time.

[0059] The liquid flow detection device provided by the present invention includes a pulsed liquid flow sensor module 1, a signal coupling module 2 and a waveform shaping module 3. Through the cooperation of the pulsed liquid flow sensor module 1, the signal coupling module 2 and the waveform shaping module 3, it can be ensured that the signal output after the signal coupling module 2 and the waveform shaping module 3 is a unidirectional coupled pulse signal with unidirectional pulsation, which is convenient for subsequent comparison and analysis with the reference signal. Furthermore, the liquid flow detection device also includes a reference signal output module 4, a signal comparison module 5 and a detection module 6. The detection module 6 determines the liquid flow detection result based on the comparison result output by the signal comparison module 5. The technical solution provided by the present invention enables the liquid flow signal output by the pulsed liquid flow sensor module 1, which includes three state levels, to only include a coupled pulse signal after passing through the signal coupling module 2, making it more suitable for subsequent data processing and analysis, simplifying the design difficulty of the detection circuit, and enhancing the stability and accuracy of the liquid flow detection.

[0060] Figure 2 A schematic diagram of another liquid flow detection device provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the liquid flow detection device also includes a filtering and level conversion module 7, which is arranged in the circuit between the signal comparison module and the detection module, and is used to filter and level convert the comparison signal to obtain a liquid flow status signal, and output the liquid flow status signal to the detection module.

[0061] Specifically, the filtering and level conversion module 7 can be understood as a device that, through a specific circuit design, filters and level-converts the comparison signal output by the signal comparison module 5 to obtain a stable and reliable liquid flow status signal, and transmits it to the detection module 6. Specifically, the filtering and level conversion module 7 eliminates noise and interference signals in the comparison signal output by the signal comparison module 5 through filtering and level conversion, retains the effective signal frequency, thereby improving signal quality and reducing signal errors, ensuring that the liquid flow status signal output to the detection module 6 is accurate and reliable, and making the liquid flow detection result output by the detection module 6 based on the liquid flow status signal more accurate. The filtering and level conversion module 7 can effectively improve the signal processing capability of the liquid flow detection device, thereby improving the stability and reliability of the liquid flow detection device.

[0062] Continue to refer Figure 2 As shown, the signal comparison module 5 may include: a filtering unit 501, which is used to filter the unidirectional pulsating unidirectional coupled pulse signal output by the waveform shaping module 3 and output a DC signal; a comparison unit 502, which includes a first signal input terminal 5021 and a second signal input terminal 5022, the first signal input terminal 5021 is connected to the output terminal 5011 of the filtering unit 501, and the second signal input terminal 5022 is connected to the output terminal 401 of the reference signal output module 4, and is used to compare the DC signal with the liquid flow reference signal and output a comparison signal.

[0063] Specifically, the filtering unit 501, through a specific circuit design, filters the unidirectionally pulsating unidirectional coupled pulse signal output by the waveform shaping module 3 to eliminate the high-frequency components in the unidirectional coupled pulse signal and retain the DC component, thereby obtaining a stable DC signal output, which is output to the comparison unit 502 through the first signal input terminal 5021, thereby ensuring the stability and accuracy of the DC signal output based on the current liquid flow between the liquid inlet 01 and the liquid outlet 02. The comparison unit 502 receives the DC signal output by the output terminal 5011 of the filtering unit 501 through the first signal input terminal 5021, and receives the liquid flow reference signal output by the output terminal 401 of the reference signal output module 4 through the second signal input and output terminal 5022. The comparison unit 502 compares the DC signal with the liquid flow reference signal through a specific circuit design, thereby achieving real-time monitoring of the current liquid flow and outputting a comparison signal, thereby improving the stability and reliability of the liquid flow detection device.

[0064] For example, when the DC signal is greater than the liquid flow reference signal, the comparison unit 502 will output a low-level comparison signal after comparison and analysis, which is used to represent that the liquid flow between the liquid inlet 01 and the liquid outlet 02 is normal at this time; when the DC signal is less than the liquid flow reference signal, the comparison unit 502 will output a high-level comparison signal after comparison and analysis, which is used to represent that the liquid flow between the liquid inlet 01 and the liquid outlet 02 is abnormal at this time, and the water flow in the water circuit formed by the liquid inlet 01 and the liquid outlet 02 is insufficient, and the water flow needs to be adjusted in time.

[0065] Figure 3 This is a circuit connection diagram of a liquid flow detection device provided by an embodiment of the present utility model. Figure 3 As shown, the signal coupling module 2 includes a first capacitor C1 , a first end of the first capacitor C1 is connected to the output end 101 of the pulse liquid flow sensor module 1 , and a second end of the first capacitor C1 is connected to the input end 301 of the waveform shaping module 3 .

[0066] Specifically, the liquid flow signal output by the pulse liquid flow sensor module 1 has three levels of signals: a continuous low-level signal, a continuous high-level signal, and a pulse signal. The low-level signal and the high-level signal may interfere with subsequent signal processing and analysis. Therefore, the first end of the first capacitor C1 is connected to the output end 101 of the pulse liquid flow sensor module 1, receives the liquid flow signal output by the pulse liquid flow sensor module 1, filters out the DC component in the liquid flow signal, i.e., the continuous low-level signal and the continuous high-level signal, and retains only the AC part in the liquid flow signal, i.e., the pulse signal. The second end of the first capacitor C1 is connected to the input end 301 of the waveform shaping module 3, and outputs the coupled pulse signal to the waveform shaping module 3. The coupled pulse signal processed in this way ensures the accuracy and stability of the liquid flow signal, making it more suitable for subsequent data processing and analysis, thereby improving the stability and reliability of the liquid flow detection device.

[0067] Continue to refer Figure 3 As shown, the waveform shaping module 3 includes a second capacitor C2, a first resistor R1, a first diode D1 and a first transistor Q1; the first end of the second capacitor C2, the first end of the first resistor R1 and the positive electrode of the first diode D1 serve as the input end 301 of the waveform shaping module 3, and are all connected to the base of the first transistor Q1, and the second end of the second capacitor C2, the second end of the first resistor R1 and the negative electrode of the first diode D1 are all grounded; the collector of the first transistor Q1 is connected to the power signal end, and the emitter of the first transistor Q1 is grounded; the emitter of the first transistor Q1 is the output end 302 of the waveform shaping module 3.

[0068] Specifically, the first end of the second capacitor C2, the first end of the first resistor R1, and the anode of the first diode D1 serve as the input end 301 of the waveform shaping module 3, receiving the coupled pulse signal output by the signal coupling module 2. The first end of the second capacitor C2, the first end of the first resistor R1, and the anode of the first diode D1 are all connected to the base of the first transistor Q1, and the second end of the second capacitor C2, the second end of the first resistor R1, and the cathode of the first diode D1 are all grounded to filter out noise and interference signals in the coupled pulse signal and transmit it to the base of the first transistor Q1. The collector of the first transistor Q1 is connected to the power signal terminal, and the emitter of the first transistor Q1 is grounded; the emitter of the first transistor Q1 is the output terminal 302 of the waveform shaping module 3, so as to realize shaping processing of the filtered coupled pulse signal transmitted to the base of the first transistor Q1, so that after the filtered coupled pulse signal passes through the first transistor Q1, the output signal is a unidirectional coupled pulse signal with unidirectional pulsation, that is, the output signal only contains pulse signals in the positive direction or negative direction and zero signals, which helps to standardize the waveform of the output signal, making it easier to process and analyze, while reducing possible noise interference, improving the clarity and stability of the signal, and thus improving the stability and reliability of the flow detection device.

[0069] Continue to refer Figure 3 As shown, the waveform shaping module 3 also includes a second resistor R2, a third resistor R3 and a fourth resistor R4; the first end of the second resistor R2 and the first end of the third resistor R3 are both connected to the input end 301 of the waveform shaping module 3; the second end of the second resistor R2 is grounded, and the second end of the third resistor R3 is connected to the base of the first transistor Q1; the fourth resistor R4 is arranged in the circuit between the emitter of the first transistor Q1 and the ground end.

[0070] Specifically, the first end of the second resistor R2 is connected to the input terminal 301 of the waveform shaping module 3, and the second end of the second resistor R2 is grounded. This directs a portion of the current output by the pulsed liquid flow sensor module 1 to the ground, ensuring circuit stability, sharing the circuit load, and protecting other components from overload damage. The first end of the third resistor R3 is connected to the input terminal 301 of the waveform shaping module 3, and the second end of the third resistor R3 is connected to the base of the first transistor Q1 to divide the voltage to the base of the first transistor Q1, thereby regulating the amplitude of the signal input to the first transistor Q1, ensuring that the signal operates within an appropriate range, and protecting the first transistor Q1 from excessive signals. The fourth resistor R4 is disposed in the circuit between the emitter of the first transistor Q1 and the ground terminal to limit current and protect the first transistor Q1 from overload and short circuits, helping to stabilize the circuit, ensure the normal operation of the components, and extend their lifespan. The rational design and function of the protective resistor help maintain the normal operation of the liquid flow detection circuit, protect the components, and ensure the accuracy and reliability of the liquid flow detection device.

[0071] Continue to refer Figure 3 As shown, the reference signal output module 4 includes a three-terminal voltage regulator U1, a fifth resistor R5 and a sixth resistor R6; a first pin U11 of the three-terminal voltage regulator U1 is connected to the first end of the fifth resistor R5, serving as the output end 401 of the reference signal output module 4; a second pin U12 of the three-terminal voltage regulator U1 is connected to the second end of the fifth resistor R5 and the first end of the sixth resistor; a third pin U13 of the three-terminal voltage regulator U1 and the second end of the sixth resistor R6 are both grounded.

[0072] Specifically, a first pin U11 of the three-terminal voltage regulator U1 is connected to the first end of the fifth resistor R5, and a second pin U12 of the three-terminal voltage regulator U1 is connected to the second end of the fifth resistor R5 and the first end of the sixth resistor. By adjusting the resistance ratio of the fifth resistor R5 and the sixth resistor R6, the operating state of the three-terminal voltage regulator U1 is precisely controlled. Thus, the first pin U11 of the three-terminal voltage regulator U1 serves as the output terminal 401 of the reference signal output module 4, outputting a stable reference signal representing the liquid flow rate under standard conditions. When the voltage in the liquid flow detection circuit fluctuates, by adjusting the ratio of the fifth resistor R5 and the sixth resistor R6, the output voltage of the three-terminal voltage regulator U1 can be adjusted to maintain a stable level, providing a reliable liquid flow reference signal output. This liquid flow reference signal can be used as a benchmark for calibrating and calibrating the liquid flow detection device. By comparing and analyzing the actual detected liquid flow signal, it can better understand abnormal liquid flow rates, promptly identify problems, and take appropriate measures, thereby improving the stability and reliability of the liquid flow monitoring device.

[0073] Continue to refer Figure 3 As shown, the reference signal output module 4 also includes a seventh resistor R7 and a third capacitor C3; the first end of the seventh resistor R7 is connected to the power signal end, the second end of the seventh resistor R7 and the first end of the third capacitor C3 are both connected to the first pin U11 of the three-terminal regulator U1, and the second end of the third capacitor C3 is grounded.

[0074] Specifically, the first end of the seventh resistor R7 is connected to the power signal terminal, and the second end of the seventh resistor R7 is connected to the first pin U11 of the three-terminal voltage regulator U1 to divide the voltage input to the reference signal output module 4 from the power signal terminal, thereby introducing an appropriate voltage into the three-terminal voltage regulator U1 to ensure a stable liquid flow reference signal output, which helps to adapt to different power supply voltages and enable the liquid flow detection device to operate normally under different working conditions. The first end of the third capacitor C3 is connected to the first pin U11 of the three-terminal voltage regulator U1, and the second end of the third capacitor C3 is grounded to provide a stable voltage filtering effect, ensuring that the three-terminal voltage regulator U1 obtains a stable input voltage, which helps to reduce interference in the liquid flow detection circuit and improve the stability and reliability of the liquid flow reference signal output. Through the reasonable design and configuration of the seventh resistor R7 and the third capacitor C3, the reference signal output module 4 can ensure the stable transmission of voltage from the power signal terminal to the three-terminal voltage regulator U1, and provide the liquid flow detection device with a stable liquid flow reference signal output to represent the liquid flow under standard conditions.

[0075] Continue to refer Figure 3 As shown, the filtering unit 501 includes a second diode D2, a fourth capacitor C4, an eighth resistor R8 and a ninth resistor R9. The positive electrode of the second diode D2 is connected to the output terminal 302 of the waveform shaping module 3, and the negative electrode of the second diode D2, the first end of the fourth capacitor C4 and the first end of the eighth resistor R8 are all connected to the first signal input terminal 5021; the second end of the fourth capacitor C4 and the second end of the eighth resistor R8 are both grounded; and the ninth resistor R9 is arranged in the circuit between the negative electrode of the second diode D2 and the first signal input terminal 5021.

[0076] Specifically, the anode of the second diode D2 is connected to the output terminal 302 of the waveform shaping module 3, and the cathode of the second diode D2 is connected to the first signal input terminal 5021, to ensure that the unidirectional pulsating unidirectional coupled pulse signal output by the waveform shaping module 3 is a unidirectional input signal to the comparison module 5, preventing interference from reverse signals and ensuring the normal operation of the liquid flow detection system. The first end of the fourth capacitor C4 and the first end of the eighth resistor R8 are both connected to the first signal input terminal 5021, and the second end of the fourth capacitor C4 and the second end of the eighth resistor R8 are both grounded to filter the unidirectional pulsating unidirectional coupled pulse signal output by the waveform shaping module 3 to eliminate the high-frequency components in the unidirectional coupled pulse signal and retain the DC component, thereby obtaining a stable DC signal, which is transmitted to the comparison unit 502 via the first signal input terminal 5021 to represent the current liquid flow between the liquid inlet O1 and the liquid outlet O2. A ninth resistor R9 is positioned in the circuit between the cathode of the second diode D2 and the first signal input terminal 5021. By appropriately setting the resistance of the ninth resistor R9, voltage division can be achieved, ensuring that the signal input to the first signal input terminal 5021 is within an appropriate range to meet the requirements of the subsequent liquid flow detection circuit. By properly configuring the components in the filtering unit 501, the unidirectional coupled pulse signal output by the waveform shaping module 3 can be effectively processed, resulting in a stable DC signal, which supports the accuracy of liquid flow detection.

[0077] Continue to refer Figure 3 As shown, the comparison unit 502 includes an operational amplifier U2A, a tenth resistor R10 and an eleventh resistor R11; the opposite-name terminals of the operational amplifier U2A are connected to the first signal input terminal 5021, the same-name terminals of the operational amplifier U2A are connected to the second signal input terminal 5022, and the output terminal 5023 of the operational amplifier U2A is the output terminal 503 of the signal comparison module 5; the first end of the tenth resistor R11 is connected to the output terminal 401 of the reference signal output module 4, the second end of the tenth resistor R10 and the first end of the eleventh resistor R11 are both connected to the second signal input terminal 5022, and the second end of the eleventh resistor is connected to the output terminal 5023 of the operational amplifier U2A.

[0078] Specifically, the opposite-name terminal of the operational amplifier U2A is connected to the first signal input terminal 5021, the same-name terminal of the operational amplifier U2A is connected to the second signal input terminal 5022, and the output terminal 5023 of the operational amplifier U2A is the output terminal 503 of the signal comparison module 5. The operational amplifier U2A compares the signal sizes inputted by the first signal input terminal 5021 and the second signal input terminal 5022 to accurately monitor and analyze whether the current liquid flow rate meets the standard liquid flow rate. When the liquid flow rate is abnormal, the problem can be discovered in time and corresponding measures can be taken, thereby improving the stability and reliability of the liquid flow detection device.

[0079] For example, when the input signal of the first signal input terminal 5021 is greater than the input signal of the second signal input terminal 5022, that is, the input signal of the opposite-name terminal of the operational amplifier U2A is greater than the input signal of the same-name terminal of the operational amplifier U2A, the operational amplifier U2A will output a low-level comparison signal after comparison and analysis, which is used to represent that the liquid flow rate between the liquid inlet 01 and the liquid outlet 02 is normal at this time; when the input signal of the first signal input terminal 5021 is less than the input signal of the second signal input terminal 5022, that is, the input signal of the opposite-name terminal of the operational amplifier U2A is less than the input signal of the same-name terminal of the operational amplifier U2A, the operational amplifier U2A will output a high-level comparison signal after comparison and analysis, which is used to represent that the liquid flow rate between the liquid inlet 01 and the liquid outlet 02 is abnormal at this time, and the water flow rate of the water circuit formed by the liquid inlet 01 and the liquid outlet 02 is insufficient, and the water flow rate needs to be adjusted in time.

[0080] Specifically, the first end of the tenth resistor R11 is connected to the output terminal 401 of the reference signal output module 4, and the second end of the tenth resistor R10 is connected to the second signal input terminal 5022. By appropriately setting the resistance value of the tenth resistor R10, the output voltage of the reference signal output module 4 can be divided, which helps to ensure that the input signal of the second signal input terminal 5022 is within an appropriate range to meet the working requirements of the operational amplifier U2A. The first end of the eleventh resistor R11 is connected to the second signal input terminal 5022, and the second end of the eleventh resistor is connected to the output terminal 5023 of the operational amplifier U2A. By appropriately setting the resistance value of the eleventh resistor R11, the current output by the operational amplifier U2A can be divided, which helps to ensure that the current output by the operational amplifier U2A is within an appropriate range and protects the subsequent liquid flow circuit from the influence of excessive current. By reasonably configuring the tenth resistor R10 and the eleventh resistor R11 in the comparison unit 502, the signal can be adjusted and processed to ensure the normal operation of the liquid flow detection device.

[0081] Continue to refer Figure 3 As shown, the filtering and level conversion module 7 includes a twelfth resistor R12, a fifth capacitor C5, a third diode D3, a thirteenth resistor R13, a second transistor Q2 and a fourteenth resistor R14; the first end of the twelfth resistor R12 is connected to the output end 503 of the signal comparison module 5; the second end of the twelfth resistor R12, the first end of the fifth capacitor C5, the cathode of the third diode D3 and the first end of the thirteenth resistor R13 are all connected to the base of the second transistor Q2, the second end of the fifth capacitor C5, the anode of the third diode D3, the second end of the thirteenth resistor R13 and the emitter of the second transistor Q2 are all grounded; the first end of the fourteenth resistor R14 is connected to the power signal end, and the second end of the fourteenth resistor is connected to the collector of the second transistor Q2; the collector of the second transistor Q2 is connected to the detection module 6.

[0082] Specifically, the first end of the twelfth resistor R12 is connected to the output terminal 503 of the signal comparison module 5, and the second end of the twelfth resistor R12 is connected to the base of the second transistor Q2. By appropriately setting the resistance value of the twelfth resistor R12, the voltage output by the comparison module 5 can be divided, ensuring that the signal input to the filtering and level conversion module 7 is within an appropriate range to meet the requirements of the subsequent liquid flow detection circuit. The first end of the fifth capacitor C5, the cathode of the third diode D3, and the first end of the thirteenth resistor R13 are all connected to the base of the second transistor Q2. The second end of the fifth capacitor C5, the anode of the third diode D3, and the second end of the thirteenth resistor R13 are all grounded to filter noise and interference signals from the comparison signal and transmit it to the base of the second transistor Q2. The emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is connected to the detection module 6 to perform level conversion on the comparison signal input to the second transistor Q2, so that the comparison signal can be converted into a liquid flow state signal suitable for processing by the detection module 6, so that the detection module 6 can output a more accurate liquid flow detection result based on the liquid flow state signal. The first end of the fourteenth resistor R14 is connected to the power signal end, and the second end of the fourteenth resistor is connected to the collector of the second transistor Q2. By appropriately setting the resistance value of the fourteenth resistor R14, the voltage of the power signal end input to the second transistor Q2 can be divided, ensuring that the signal input to the second transistor Q2 is within an appropriate range to protect the second diode D2 and the subsequent liquid flow detection circuit. By reasonably configuring the various components in the filtering and level conversion module 7, the filtering processing and conversion of the comparison signal can be achieved, and a stable and reliable liquid flow state signal can be obtained to ensure the normal operation of the system and improve the stability and reliability of the liquid flow detection device.

[0083] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A liquid flow detection device, characterized in that: include: A pulsed liquid flow sensor module is provided in the circuit between the liquid inlet and the liquid outlet, and is used to sense and output a liquid flow signal; a signal coupling module connected to the pulsed liquid flow sensing module, configured to receive and couple the liquid flow signal and output a coupled pulse signal; a waveform shaping module, connected to the signal coupling module, for shaping the coupled pulse signal and outputting a unidirectional coupled pulse signal with unidirectional pulsation; Reference signal output module, used for outputting liquid flow reference signal; a signal comparison module, connected to the waveform shaping module and the reference signal output module respectively, for comparing the unidirectional coupled pulse signal with the liquid flow reference signal and outputting a comparison signal; The detection module is connected to the signal comparison module and is used to output a liquid flow detection result according to the comparison signal.

2. The liquid flow detection device according to claim 1, characterized in that: The liquid flow detection device also includes: The filtering and level conversion module is provided in the circuit between the signal comparison module and the detection module, and is used for filtering and level converting the comparison signal to obtain a liquid flow status signal, and outputting the liquid flow status signal to the detection module.

3. The liquid flow detection device according to claim 1, characterized in that: The signal comparison module includes: a filtering unit, configured to filter the unidirectionally pulsating unidirectional coupled pulse signal output by the waveform shaping module and output a DC signal; The comparison unit includes a first signal input terminal and a second signal input terminal, wherein the first signal input terminal is connected to the output terminal of the filtering unit, and the second signal input terminal is connected to the output terminal of the reference signal output module, and is used to compare the DC signal with the liquid flow reference signal and output a comparison signal.

4. The liquid flow detection device according to claim 1, characterized in that: The signal coupling module includes a first capacitor; The first end of the first capacitor is connected to the output end of the pulse liquid flow sensor module, and the second end of the first capacitor is connected to the input end of the waveform shaping module.

5. The liquid flow detection device according to claim 1, characterized in that: The waveform shaping module includes: a second capacitor, a first resistor, a first diode and a first transistor; The first end of the second capacitor, the first end of the first resistor, and the positive electrode of the first diode serve as the input end of the waveform shaping module and are all connected to the base of the first transistor. The second end of the second capacitor, the second end of the first resistor, and the negative electrode of the first diode are all grounded. The collector of the first transistor is connected to the power signal end, and the emitter of the first transistor is grounded. The emitter of the first transistor is the output end of the waveform shaping module.

6. The liquid flow detection device according to claim 5, characterized in that: The waveform shaping module further includes: a second resistor, a third resistor and a fourth resistor; The first end of the second resistor and the first end of the third resistor are both connected to the input end of the waveform shaping module; the second end of the second resistor is grounded, and the second end of the third resistor is connected to the base of the first transistor; the fourth resistor is arranged in the circuit between the emitter of the first transistor and the ground end.

7. The liquid flow detection device according to claim 1, characterized in that: The reference signal output module includes: a three-terminal voltage regulator, a fifth resistor and a sixth resistor; The first pin of the three-terminal regulator is connected to the first end of the fifth resistor, serving as the output end of the reference signal output module; the second pin of the three-terminal regulator is connected to the second end of the fifth resistor and the first end of the sixth resistor; the third pin of the three-terminal regulator and the second end of the sixth resistor are both grounded.

8. The liquid flow detection device according to claim 7, characterized in that: The reference signal output module further includes: a seventh resistor and a third capacitor; The first end of the seventh resistor is connected to the power signal end, the second end of the seventh resistor and the first end of the third capacitor are both connected to the first pin of the three-terminal regulator, and the second end of the third capacitor is grounded.

9. The liquid flow detection device according to claim 3, characterized in that: The filtering unit includes: a second diode, a fourth capacitor, an eighth resistor and a ninth resistor; The anode of the second diode is connected to the output end of the waveform shaping module, the cathode of the second diode, the first end of the fourth capacitor, and the first end of the eighth resistor are all connected to the first signal input end; the second end of the fourth capacitor and the second end of the eighth resistor are both grounded; and the ninth resistor is arranged in the circuit between the cathode of the second diode and the first signal input end; The comparison unit includes: an operational amplifier, a tenth resistor, and an eleventh resistor; The opposite-name terminal of the operational amplifier is connected to the first signal input terminal, the same-name terminal of the operational amplifier is connected to the second signal input terminal, and the output terminal of the operational amplifier is the output terminal of the signal comparison module; the first end of the tenth resistor is connected to the output terminal of the reference signal output module, the second end of the tenth resistor and the first end of the eleventh resistor are both connected to the second signal input terminal, and the second end of the eleventh resistor is connected to the output terminal of the operational amplifier.

10. The liquid flow detection device according to claim 2, characterized in that: The filtering and level conversion module includes: a twelfth resistor, a fifth capacitor, a third diode, a thirteenth resistor, a second transistor and a fourteenth resistor; The first end of the twelfth resistor is connected to the output end of the signal comparison module; the second end of the twelfth resistor, the first end of the fifth capacitor, the cathode of the third diode and the first end of the thirteenth resistor are all connected to the base of the second transistor, the second end of the fifth capacitor, the anode of the third diode, the second end of the thirteenth resistor and the emitter of the second transistor are all grounded; the first end of the fourteenth resistor is connected to the power signal end, and the second end of the fourteenth resistor is connected to the collector of the second transistor; the collector of the second transistor is connected to the detection module.

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