CN112113624B - Water flow monitoring device - Google Patents
Water flow monitoring device Download PDFInfo
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- CN112113624B CN112113624B CN202011013601.8A CN202011013601A CN112113624B CN 112113624 B CN112113624 B CN 112113624B CN 202011013601 A CN202011013601 A CN 202011013601A CN 112113624 B CN112113624 B CN 112113624B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000012806 monitoring device Methods 0.000 title claims description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
The invention relates to the technical field of environmental protection, and provides water flow monitoring equipment, which comprises an amplifying circuit connected with a main control circuit, wherein the amplifying circuit comprises an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is grounded through a resistor R5, the inverting input end of the operational amplifier U1 is connected with the output end of a water flow sensor, the inverting input end of the operational amplifier U1 is also connected with the output end VREF of a compensation circuit, the output end of the operational amplifier U1 is connected to the inverting input end through a feedback network, the compensation circuit comprises an operational amplifier U2A and a resistor divider circuit, the non-inverting input end of the operational amplifier U2A is grounded, the inverting input end of the operational amplifier U2A is connected with the output end of the resistor divider circuit, the output end of the operational amplifier U2A is connected to the input end through a resistor R14, and the output end of the operational amplifier U2A forms the output end VREF of the compensation circuit. Through above-mentioned technical scheme, solved the poor problem of water flow monitoring facilities detection accuracy in prior art.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to water flow monitoring equipment.
Background
The water flow monitoring device is used for realizing functions of real-time online monitoring, data statistics and inquiry, water taking plan management and control and the like on the water consumption of a user, so that technical support is provided for realizing the strictest water resource management system, and sustainable utilization of water resources and water conservation are promoted. Currently, measurement devices for water flow monitoring devices are still to be improved.
Disclosure of Invention
The invention provides water flow monitoring equipment, which solves the problem of poor detection precision of the water flow monitoring equipment in the prior art.
The technical scheme of the invention is as follows: comprises an amplifying circuit connected with a main control circuit, wherein the amplifying circuit comprises an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is grounded through a resistor R5, the inverting input end of the operational amplifier U1 is used for being connected with the output end of a water flow sensor, the inverting input end of the operational amplifier U1 is also connected with the output end VREF of a compensation circuit, the output end of the operational amplifier U1 is connected to the inverting input end through a feedback network,
the compensation circuit comprises an operational amplifier U2A and a resistor divider circuit, wherein the non-inverting input end of the operational amplifier U2A is grounded, the inverting input end of the operational amplifier U2A is connected with the output end of the resistor divider circuit, the output end of the operational amplifier U2A is connected to the input end through a resistor R14, the output end of the operational amplifier U2A forms the output end VREF of the compensation circuit,
the resistor voltage dividing circuit comprises a potentiometer W1, a thermistor RT1, a resistor R12 and a resistor R11 which are sequentially connected, one end of the potentiometer W1 is connected with a power supply 5V, and one end of the resistor R11 is grounded.
Further, the amplifying circuit also comprises an operational amplifier U3, the non-inverting input end of the operational amplifier U3 is grounded, the inverting input end of the operational amplifier U3 is connected with the output end of the operational amplifier U1 through a resistor R17, the output end of the operational amplifier U3 is connected with the inverting input end through a resistor R5 and a resistor R17 in sequence,
the output end of the operational amplifier U3 is connected to the inverting input end through a resistor R15 and a resistor R6 in sequence,
the circuit further comprises a potentiometer W3, wherein two fixed ends of the potentiometer W3 are connected between the resistor R5 and the resistor R15, and a sliding end of the potentiometer W3 is connected to an inverting input end of the operational amplifier U3.
Further, the circuit further comprises a potentiometer W2, wherein two fixed ends of the potentiometer W2 are connected between two bias voltage input ends of the operational amplifier U3, and a sliding end of the potentiometer W2 is connected with the power supply 15V.
Further, the feedback network comprises a resistor R1, a resistor R2 and a resistor R3, wherein the resistor R2 and the resistor R3 are sequentially connected, one end of the resistor R2 is connected with the inverting input end of the operational amplifier U2A, the other end of the resistor R3 is connected with the output end of the operational amplifier U2A, one end of the resistor R2 connected with the resistor R3 is connected with the resistor R1, and the other end of the resistor R1 is grounded.
Further, the power supply circuit comprises a PMOS tube M1, a resistor R23 and a resistor R24, wherein the resistor R23 and the resistor R24 are connected in series, one end of the resistor R23 is connected with a battery output end VBAT, one end of the resistor R24 is grounded,
the S pole of the PMOS tube M1 is connected with one end of the resistor R23, the other end of the resistor R23 is connected with the G pole of the PMOS tube M1, and the D pole of the PMOS tube M1 is used as a power supply output positive end V+.
Further, a voltage stabilizing tube VD1 is connected in parallel between the battery output end VBAT and the ground, and a capacitor C21 is connected in parallel between the D pole of the PMOS tube M1 and the ground.
Further, the anti-leakage circuit comprises a diode D3, a capacitor C21, a resistor R20, an optocoupler chip U4, a triode Q2 and a relay K1,
the diode D3 and the capacitor C21 are connected in sequence, the anode of the diode D3 is connected with the PE line, one end of the capacitor C21 is grounded, the resistor R20 is connected with the capacitor C21 in parallel,
the cathode of the diode D3 is also connected with one input end of the optocoupler chip U4, the other input end of the optocoupler chip U4 is grounded, the output end of the optocoupler chip U4 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected with the power supply 12V, and the normally open contact of the relay K1 is connected into the power supply circuit.
The working principle and the beneficial effects of the invention are as follows:
the input end of the amplifying circuit is connected with the output end of the water flow sensor, and is used for amplifying a weak voltage signal output by the water flow sensor, sending the weak voltage signal into the main control circuit, and the main control circuit reads the output of the amplifying circuit and calculates the output to obtain water flow information.
The output signal of the water flow sensor is connected to the inverting input end of the operational amplifier U1 to amplify the signal, the operational amplifier U1 is in an amplifying working state, the temperature can be obviously increased, and the inverting input end of the operational amplifier U1 is overlapped with compensation voltage to offset the change of the static working point of the operational amplifier U1 caused by the temperature change. The specific working process is as follows: the potentiometer W1, the thermistor RT1, the resistor R12 and the resistor R11 form a series voltage dividing circuit, the series voltage dividing circuit is arranged between the power supply 5V and the ground, the thermistor is attached to the back surface of the operational amplifier U1 and used for detecting the temperature of the operational amplifier U1, when the temperature rises, the resistance value of the resistor RT1 is reduced, the voltage division of the resistor R11 and the resistor R12 is increased, the voltage of the inverting input end of the operational amplifier U2A is increased, the voltage VREF of the output end of the operational amplifier U2A is inversely proportional increased, the voltage VREF is superposed on the inverting input end of the operational amplifier U1, the voltage of the inverting input end of the operational amplifier U1 is reduced, and the voltage of the inverting input end of the operational amplifier U1 caused by temperature increase is offset, and the accuracy of amplified output voltage is ensured.
The output voltage of the operational amplifier U1 is hardly influenced by temperature change, and the accuracy of water flow monitoring is improved.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic block diagram of a circuit of the present invention;
FIG. 2 is a schematic diagram of an amplifying circuit according to the present invention;
FIG. 3 is a schematic diagram of a compensation circuit according to the present invention;
FIG. 4 is a schematic diagram of a power supply circuit according to the present invention;
FIG. 5 is a schematic diagram of an anti-leakage circuit according to the present invention;
in the figure: the system comprises a 1-main control circuit, a 2-amplifying circuit, a 3-compensating circuit, a 4-power supply circuit, a 5-leakage-proof circuit and a 6-water flow sensor.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the water flow monitoring device of this embodiment includes an amplifying circuit connected with a main control circuit, the amplifying circuit includes an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is grounded through a resistor R5, the inverting input end of the operational amplifier U1 is connected with the output end of the water flow sensor, the inverting input end of the operational amplifier U1 is also connected with the output end VREF of a compensation circuit, the output end of the operational amplifier U1 is connected with the inverting input end through a feedback network,
the compensation circuit comprises an operational amplifier U2A and a resistor divider circuit, the non-inverting input end of the operational amplifier U2A is grounded, the inverting input end of the operational amplifier U2A is connected with the output end of the resistor divider circuit, the output end of the operational amplifier U2A is connected to the input end through a resistor R14, the output end of the operational amplifier U2A forms the output end VREF of the compensation circuit,
the resistor divider circuit comprises a potentiometer W1, a thermistor RT1, a resistor R12 and a resistor R11 which are sequentially connected, one end of the potentiometer W1 is connected with a power supply 5V, and one end of the resistor R11 is grounded.
As shown in fig. 1-3, in this embodiment, the input end of the amplifying circuit is connected to the output end of the water flow sensor, and is used to amplify the weak voltage signal output by the water flow sensor, and send the signal to the main control circuit, where the main control circuit reads the output of the amplifying circuit and obtains the water flow information after calculation.
The output signal of the water flow sensor is connected to the inverting input end of the operational amplifier U1 to amplify the signal, the operational amplifier U1 is in an amplifying working state, the temperature can be obviously increased, and the inverting input end of the operational amplifier U1 is overlapped with compensation voltage to offset the change of the static working point of the operational amplifier U1 caused by the temperature change. The specific working process is as follows: the potentiometer W1, the thermistor RT1, the resistor R12 and the resistor R11 form a series voltage dividing circuit, the series voltage dividing circuit is arranged between the power supply 5V and the ground, the thermistor is attached to the back surface of the operational amplifier U1 and used for detecting the temperature of the operational amplifier U1, when the temperature rises, the resistance value of the resistor RT1 is reduced, the voltage division of the resistor R11 and the resistor R12 is increased, the voltage of the inverting input end of the operational amplifier U2A is increased, the voltage VREF of the output end of the operational amplifier U2A is inversely proportional increased, the voltage VREF is superposed on the inverting input end of the operational amplifier U1, the voltage of the inverting input end of the operational amplifier U1 is reduced, and the voltage of the inverting input end of the operational amplifier U1 caused by temperature increase is offset, and the accuracy of amplified output voltage is ensured.
In the embodiment, the output voltage of the operational amplifier U1 is hardly affected by temperature change, so that the accuracy of water flow monitoring is improved.
Further, the amplifying circuit also comprises an operational amplifier U3, the non-inverting input end of the operational amplifier U3 is grounded, the inverting input end of the operational amplifier U3 is connected with the output end of the operational amplifier U1 through a resistor R17, the output end of the operational amplifier U3 is connected with the inverting input end through a resistor R5 and a resistor R17 in sequence,
the output end of the operational amplifier U3 is connected to the inverting input end through a resistor R15 and a resistor R6 in sequence,
the circuit further comprises a potentiometer W3, wherein two fixed ends of the potentiometer W3 are connected between the resistor R5 and the resistor R15, and a sliding end of the potentiometer W3 is connected to an inverting input end of the operational amplifier U3.
As shown in fig. 2, the operational amplifier U3, the resistor R15, and the resistor R17 form an inverting proportion operation circuit, and are cascaded with the inverting proportion operation circuit formed by the operational amplifier U1, and the resistances of the resistor R15 and the resistor R17 are the same, so that the voltage signal input to the inverting input terminal is inverted, and finally, the in-phase amplification of the input voltage signal uin_1 is realized. During practical application, the resistance values of the resistor R15 and the resistor R17 have deviation, so that the deviation of the output voltage gain of the operational amplifier U3 is caused, the deviation of the output gain can be reduced by adjusting the potentiometer W3, the resistor R5 and the resistor R6 play a certain compensation role, the adjusting range of the potentiometer W3 can be reduced, the potentiometer W3 can be conveniently adjusted, and the output precision is further ensured.
In this embodiment, the flow sensor is an electromagnetic flow sensor, and a weak voltage signal uin_1 output by the electromagnetic flow sensor is amplified by the op amp U1 and inverted by the op amp U3, and then a voltage signal uin_2 is output, and the voltage signal uin_2 is input into the main control circuit.
Further, the circuit further comprises a potentiometer W2, wherein two fixed ends of the potentiometer W2 are connected between two bias voltage input ends of the operational amplifier U3, and a sliding end of the potentiometer W2 is connected with a power supply 15V.
As shown in fig. 2, the specific model of the operational amplifier U3 is OP07, the OFFSET voltage input ends OFFSET N1 and OFFSET N2 are respectively provided at the 1 pin and the 8 pin, and the input OFFSET voltage of the operational amplifier U3 can be adjusted by adjusting the potentiometer W2, so that the output is zero when the input is zero, and the output precision is further ensured.
Further, the feedback network comprises a resistor R1, a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are sequentially connected, one end of the resistor R2 is connected with the inverting input end of the operational amplifier U2A, the other end of the resistor R3 is connected with the output end of the operational amplifier U2A, one end of the resistor R2 connected with the resistor R3 is connected with the resistor R1, and the other end of the resistor R1 is grounded.
As shown in FIG. 2, the feedback network formed by the resistor R1, the resistor R2 and the resistor R3 is equivalent to a resistor with a large resistance value, so that the amplification factor of the operational amplifier U1 can be ensured, the resistance values of the resistor R1, the resistor R2 and the resistor R3 can be selected to be smaller, the circuit stability is better, and the output precision of the circuit is further improved.
Further, the power supply circuit comprises a PMOS tube M1, a resistor R23 and a resistor R24, wherein the resistor R23 and the resistor R24 are connected in series, one end of the resistor R23 is connected with a battery output end VBAT, one end of the resistor R24 is grounded,
the S pole of the PMOS tube M1 is connected with one end of a resistor R23, the other end of the resistor R23 is connected with the G pole of the PMOS tube M1, and the D pole of the PMOS tube M1 is used as a power supply output positive end V+.
As shown in fig. 4, in this embodiment, the battery is used for supplying power, so that the installation on a pipeline is facilitated, the resistor R23 and the resistor R24 form a series voltage dividing circuit, the series voltage dividing circuit is arranged between the battery output end VBAT and the ground, and provides bias voltage for the PMOS tube M1, when the voltage of the battery output end VBAT is too low, the voltage dividing of the resistor R23 is reduced, the PMOS tube M1 is turned off, and the connection between the subsequent circuit and the battery output end VBAT is disconnected, so that the battery is prevented from being excessively discharged.
Further, a voltage stabilizing tube VD1 is connected in parallel between the battery output end VBAT and the ground, and a capacitor C21 is connected in parallel between the D pole of the PMOS tube M1 and the ground.
As shown in fig. 4, the voltage stabilizing tube VD1 is connected in parallel between the battery output end VBAT and the ground, so that transient overvoltage can be absorbed, and damage to subsequent circuits is avoided; a capacitor C21 is connected in parallel between the D pole of the PMOS tube M1 and the ground, so as to play a role in stabilizing voltage and provide a stable power supply for a subsequent circuit.
Further comprises an anti-leakage circuit, the anti-leakage circuit comprises a diode D3, a capacitor C21, a resistor R20, an optocoupler chip U4, a triode Q2 and a relay K1,
the diode D3 and the capacitor C21 are connected in sequence, the anode of the diode D3 is connected with the PE wire, one end of the capacitor C21 is grounded, the resistor R20 is connected with the capacitor C21 in parallel,
the cathode of the diode D3 is also connected with one input end of the optocoupler chip U4, the other input end of the optocoupler chip U4 is grounded, the output end of the optocoupler chip U4 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected with the power supply 12V, and the normally open contact of the relay K1 is connected into the power supply circuit.
As shown in fig. 5, the casing of the monitoring device in this embodiment is connected to a PE line, during normal operation, the PE line is not electrified, the voltage between the PE line and the ground is 0, the optocoupler chip U4 is not conductive, the output end of the optocoupler chip U4 is at a high level, the triode Q2 is conductive, the coil of the relay K1 is electrified, the normally open contact is closed, and the power supply circuit supplies power to the subsequent circuit; when the circuit in the shell leaks electricity, the shell is electrified, a potential difference exists between the PE wire and the ground, when the potential difference reaches a set value, the optical coupler chip U4 is conducted, the output end of the optical coupler chip U4 is in a low level, the triode Q2 is not conducted, the coil of the relay K1 is powered off, the normally open contact is disconnected, the power supply circuit is disconnected from a subsequent circuit, and the protection circuit element is further damaged.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The water flow monitoring equipment comprises an amplifying circuit (2) connected with a main control circuit (1), and is characterized in that the amplifying circuit (2) comprises an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is grounded through a resistor R5, the inverting input end of the operational amplifier U1 is used for being connected with the output end of a water flow sensor (6), the inverting input end of the operational amplifier U1 is also connected with the output end VREF of a compensation circuit (3), the output end of the operational amplifier U1 is connected to the inverting input end through a feedback network,
the compensation circuit (3) comprises an operational amplifier U2A and a resistor divider circuit, wherein the non-inverting input end of the operational amplifier U2A is grounded, the inverting input end of the operational amplifier U2A is connected with the output end of the resistor divider circuit, the output end of the operational amplifier U2A is connected to the input end through a resistor R14, the output end of the operational amplifier U2A forms the output end VREF of the compensation circuit (3),
the resistor voltage dividing circuit comprises a potentiometer W1, a thermistor RT1, a resistor R12 and a resistor R11 which are sequentially connected, one end of the potentiometer W1 is connected with a power supply 5V, and one end of the resistor R11 is grounded.
2. The water flow monitoring device according to claim 1, wherein the amplifying circuit (2) further comprises an operational amplifier U3, the non-inverting input terminal of the operational amplifier U3 is grounded, the inverting input terminal of the operational amplifier U3 is connected with the output terminal of the operational amplifier U1 through resistors R5 and R15 in sequence,
the output end of the operational amplifier U3 is connected to the inverting input end through a resistor R17 and a resistor R6 in sequence,
the circuit further comprises a potentiometer W3, wherein two fixed ends of the potentiometer W3 are connected between the resistor R17 and the resistor R15, and a sliding end of the potentiometer W3 is connected to an inverting input end of the operational amplifier U3.
3. The water flow rate monitoring device according to claim 2, further comprising a potentiometer W2, wherein two fixed ends of the potentiometer W2 are connected between two bias voltage input ends of the op-amp U3, and a sliding end of the potentiometer W2 is connected with the power supply 15V.
4. The water flow monitoring device according to claim 1, wherein the feedback network comprises a resistor R1, a resistor R2 and a resistor R3, the resistor R2 and the resistor R3 are sequentially connected, one end of the resistor R2 is connected with an inverting input end of the op-amp U1, the other end of the resistor R3 is connected with an output end of the op-amp U1, one end of the resistor R2 connected with the resistor R3 is connected with the resistor R1, and the other end of the resistor R1 is grounded.
5. The water flow monitoring device according to claim 1, further comprising a power supply circuit (4), wherein the power supply circuit (4) comprises a PMOS tube M1, a resistor R23 and a resistor R24, the resistor R23 and the resistor R24 are connected in series, one end of the resistor R23 is connected with a battery output VBAT, one end of the resistor R24 is grounded,
the S pole of the PMOS tube M1 is connected with one end of the resistor R23, the other end of the resistor R23 is connected with the G pole of the PMOS tube M1, and the D pole of the PMOS tube M1 is used as a power supply output positive end V+.
6. The water flow monitoring device according to claim 5, wherein a voltage stabilizing tube VD1 is connected in parallel between the battery output end VBAT and the ground, and a capacitor C21 is connected in parallel between the D pole of the PMOS tube M1 and the ground.
7. The water flow monitoring device according to claim 5, further comprising an anti-leakage circuit (5), the anti-leakage circuit (5) comprising a diode D3, a capacitor C21, a resistor R20, an optocoupler U4, a triode Q2 and a relay K1,
the diode D3 and the capacitor C21 are connected in sequence, the anode of the diode D3 is connected with the PE line, one end of the capacitor C21 is grounded, the resistor R20 is connected with the capacitor C21 in parallel,
the cathode of the diode D3 is also connected with one input end of the optocoupler chip U4, the other input end of the optocoupler chip U4 is grounded, the output end of the optocoupler chip U4 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected with the power supply 12V, and the normally open contact of the relay K1 is connected into the power supply circuit (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011013601.8A CN112113624B (en) | 2020-09-24 | 2020-09-24 | Water flow monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011013601.8A CN112113624B (en) | 2020-09-24 | 2020-09-24 | Water flow monitoring device |
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| Publication Number | Publication Date |
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| CN112113624A CN112113624A (en) | 2020-12-22 |
| CN112113624B true CN112113624B (en) | 2023-12-05 |
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| CN202011013601.8A Active CN112113624B (en) | 2020-09-24 | 2020-09-24 | Water flow monitoring device |
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