CN219533106U - Automatic dosing system of water quality monitoring station - Google Patents
Automatic dosing system of water quality monitoring station Download PDFInfo
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- CN219533106U CN219533106U CN202223151127.2U CN202223151127U CN219533106U CN 219533106 U CN219533106 U CN 219533106U CN 202223151127 U CN202223151127 U CN 202223151127U CN 219533106 U CN219533106 U CN 219533106U
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Abstract
The utility model relates to the technical field of sewage treatment and provides an automatic dosing system of a water quality monitoring station, which comprises a main control unit and a dosing control circuit, wherein the dosing control circuit comprises a triode Q4, a field effect tube Q2, a field effect tube Q3 and a proportional electromagnetic valve, the base electrode of the triode Q4 is connected with the main control unit, the base electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with a 24V power supply, and the emitter electrode of the triode Q4 is grounded; the grid electrode of the field effect tube Q2 is connected with the collector electrode of the triode Q4, the source electrode of the field effect tube Q2 is connected with a 24V power supply, the drain electrode of the field effect tube Q2 is connected with the first end of the proportional solenoid valve coil L1, the grid electrode of the field effect tube Q3 is connected with the emitter electrode of the triode Q4, the drain electrode of the field effect tube Q3 is connected with the second end of the proportional solenoid valve coil L1, and the source electrode of the field effect tube Q3 is grounded. Through above-mentioned technical scheme, the problem that automatic dosing device can't change the dosing automatically according to the turbidity of sewage among the prior art has been solved.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to an automatic dosing system of a water quality monitoring station.
Background
With the promotion of industrialization and urbanization in China, the urban sewage quantity is continuously increased, and the sewage treatment and recycling become hot problems in the current world today when water resources are extremely precious. In order to recycle sewage, chemical dosing control is needed in the sewage treatment process, and chemical agents are added into the sewage to realize the aim of sewage treatment by utilizing chemical reaction. In recent years, the dosing mode in domestic sewage treatment is usually carried out by adopting a manual adjustment mode, dosing lag is easily caused by manual work, and meanwhile, the manual work efficiency is low.
Along with the rapid development of economy and continuous progress of science and technology, the degree of automation of sewage treatment is higher and higher, and the traditional manual dosing method is changed into automatic dosing, so that the labor intensity of workers is effectively reduced, and the working efficiency of the workers is improved. However, the existing automatic dosing device cannot automatically change the dosing amount according to the turbidity of sewage, so that the quality of the treated water cannot be ensured.
Disclosure of Invention
The utility model provides an automatic dosing system of a water quality monitoring station, which solves the problem that an automatic dosing device in the prior art cannot automatically change dosing amount according to the turbidity of sewage.
The technical scheme of the utility model is as follows:
the automatic dosing system of the water quality monitoring station comprises a main control unit, a turbidity detection circuit and a dosing control circuit, wherein the turbidity detection circuit and the dosing control circuit are connected with the main control unit, the dosing control circuit comprises a resistor R1, a resistor R2, a resistor R3, a triode Q1, a rheostat RP1, a resistor R4, a triode Q4, a resistor R5, a resistor R6, a field effect tube Q2, a field effect tube Q3, a resistor R7, a resistor R8 and a proportional electromagnetic valve,
the first end of the resistor R1 is connected with the main control unit, the second end of the resistor R1 is connected with the base electrode of the triode Q1, the first end of the resistor R1 is connected with a 24V power supply through the resistor R2, the collector electrode of the triode Q1 is connected with the 24V power supply through the resistor R3, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the first end of the rheostat RP1, the second end of the rheostat RP1 is connected with the base electrode of the triode Q4, the base electrode of the triode Q4 is grounded through the resistor R4, the collector electrode of the triode Q4 is connected with the 24V power supply through the resistor R5, and the emitter electrode of the triode Q4 is grounded through the resistor R6;
the grid electrode of the field effect tube Q2 is connected with the collector electrode of the triode Q4, the source electrode of the field effect tube Q2 is connected with a 24V power supply, the drain electrode of the field effect tube Q2 is connected with the first end of the proportional solenoid valve coil L1, the grid electrode of the field effect tube Q3 is connected with the emitter electrode of the triode Q4, the drain electrode of the field effect tube Q3 is connected with the second end of the proportional solenoid valve coil L1, the source electrode of the field effect tube Q3 is grounded through the resistor R7, the first end of the resistor R8 is connected with the drain electrode of the field effect tube Q2, and the second end of the resistor R8 is grounded.
Further, the dosing control circuit further comprises a resistor R15, an optocoupler U3, a resistor R16 and a resistor R17, wherein a first input end of the optocoupler U3 is connected with the main control unit through the resistor R15, a second input end of the optocoupler U3 is grounded, a first output end of the optocoupler U3 is connected with a 5V power supply through the resistor R16, and a second output end of the optocoupler U3 is connected with a first end of the resistor R1 through the resistor R17.
Further, the utility model also comprises a current detection circuit, wherein the current detection circuit comprises a resistor R10, a resistor R11, a resistor R14, an operational amplifier U1, a resistor R9, a resistor R12 and an operational amplifier U2, wherein the inverting input end of the operational amplifier U1 is connected with the first end of the resistor R8 through the resistor R10, the non-inverting input end of the operational amplifier U1 is connected with the source electrode of the field effect transistor Q3 through the resistor R11, the non-inverting input end of the operational amplifier U1 is grounded through the resistor R14, the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1 through the resistor R9, the output end of the operational amplifier U1 is connected with the non-inverting input end of the operational amplifier U2 through the resistor R12, the output end of the operational amplifier U2 is connected with the inverting input end of the operational amplifier U2, and the output end of the operational amplifier U2 is connected with the main control unit.
Further, the turbidity detection circuit comprises an infrared emission circuit and an infrared receiving circuit, the infrared emission circuit comprises a resistor R21, a resistor R20, an operational amplifier U4, a resistor R19, a resistor R18, a resistor R22, a triode Q5, a resistor R23, a resistor R24, a resistor R25, an infrared emitter U5 and a field effect transistor Q6,
the first end of the resistor R21 is connected with a 12V power supply, the second end of the resistor R21 is connected with the in-phase input end of the operational amplifier U4 through the resistor R20, the anti-phase input end of the operational amplifier U4 is grounded through the resistor R19, the output end of the operational amplifier U4 is connected with the base electrode of the triode Q5 through the resistor R22, the collector electrode of the triode Q5 is connected with the 12V power supply, the emitter electrode of the triode Q5 is connected with the anti-phase input end of the operational amplifier U4 through the resistor R18, the emitter electrode of the triode Q5 is connected with the first end of the resistor R23, the second end of the resistor R23 is connected with the in-phase input end of the operational amplifier U4 through the resistor R24, the second end of the resistor R23 is connected with the first end of the infrared emitter U5 through the resistor R25, the second end of the infrared emitter U5 is connected with the drain electrode of the field effect transistor Q6, the grid electrode of the field effect transistor Q6 is connected with the main control unit, and the source electrode of the field effect transistor Q6 is grounded.
Further, the infrared receiving circuit comprises a resistor R26, a resistor R27, an infrared receiver U7, a capacitor C5, a capacitor C6, a resistor R28, a resistor R29, a resistor R30, an operational amplifier U6, a capacitor C8, a resistor R31, an operational amplifier U8, a resistor R32, a resistor R33 and a resistor R34,
the first end of the resistor R26 is connected with a 5V power supply, the second end of the resistor R26 is connected with the first end of the infrared receiver U7, the second end of the infrared receiver U7 is grounded through the resistor R27, the first end of the capacitor C5 is connected with the second end of the resistor R26, the second end of the capacitor C5 is connected with the inverting input end of the operational amplifier U6 through the resistor R28, the first end of the capacitor C6 is connected with the second end of the infrared receiver U7, the second end of the capacitor C6 is connected with the non-inverting input end of the operational amplifier U6 through the resistor R29, and the output end of the operational amplifier U6 is connected with the inverting input end of the operational amplifier U6 through the resistor R30;
the output end of the operational amplifier U6 is connected with the first end of the resistor R31 through the capacitor C8, the second end of the resistor R31 is connected with the inverting input end of the operational amplifier U8, the non-inverting input end of the operational amplifier U8 is connected with a 5V power supply through the resistor R33, the non-inverting input end of the operational amplifier U8 is grounded through the resistor R34, the output end of the operational amplifier U8 is connected with the inverting input end of the operational amplifier U8 through the resistor R32, and the output end of the operational amplifier U8 is connected with the main control unit.
The working principle and the beneficial effects of the utility model are as follows:
in the utility model, the turbidity detection circuit is used for detecting the turbidity of the sewage, the higher the turbidity of the sewage is, the more harmful substances in the sewage are indicated, the turbidity detection circuit converts the turbidity of the sewage into an electric signal and sends the electric signal to the main control unit, and the main control unit outputs PWM pulse control signals with different duty ratios to the input end of the dosing control circuit according to the electric signal sent by the turbidity detection circuit. The dosing control circuit controls the current flowing through the coil L1 of the proportional electromagnetic valve through PWM pulse control signals with different duty ratios, and controls the opening degree of the proportional electromagnetic valve, so that the flow of the medicament added into sewage is controlled. The current flowing through the proportional solenoid coil L1 is proportional to the opening of the proportional solenoid valve port.
Specifically, the working principle of the dosing control circuit is as follows: when the PWM signal output by the main control unit is at a low level, the transistor Q1 is turned off, and the base of the transistor Q4 is at a high level, so that the transistor Q4 is turned on. Under the condition that the triode Q4 is conducted, the field effect tube Q2 and the field effect tube Q3 are conducted simultaneously, so that driving voltage is formed at two ends of a coil L1 of the proportional electromagnetic valve, current passes through the coil L1, and the proportional electromagnetic valve is opened; when the PWM signal output by the main control unit is at a high level, the triode Q1 is conducted, the triode Q4 is cut off, the grid electrode of the field effect tube Q3 is at a low level, the grid electrode of the field effect tube Q2 is at a high level, the field effect tube Q2 and the field effect tube Q3 are cut off simultaneously, and therefore the voltage at two ends of the coil L1 of the proportional electromagnetic valve immediately disappears, and the proportional electromagnetic valve is closed.
Because the current flowing through the proportional solenoid valve coil L1 is in direct proportion to the opening of the valve port of the proportional solenoid valve, when the turbidity detection circuit detects that the turbidity of the sewage is higher, the main control unit can improve the duty ratio of the output PWM signal and improve the average current flowing through the field effect tube Q2 and the field effect tube Q3, and then the current flowing through the proportional solenoid valve coil L1 can correspondingly improve, the proportional solenoid valve can increase the opening of the valve port and improve the dosage of the medicament added into the sewage. According to the utility model, the dosage of the medicament added into the sewage can be changed according to the turbidity of the sewage, so that the efficiency is improved, and the quality of the treated water is ensured.
The utility model will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a circuit diagram of a dosing control circuit of the present utility model;
FIG. 2 is a circuit diagram of an isolated drive circuit of the present utility model;
FIG. 3 is a circuit diagram of a current detection circuit according to the present utility model;
FIG. 4 is a circuit diagram of an infrared emission circuit according to the present utility model;
fig. 5 is a circuit diagram of an infrared receiving circuit in the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, the embodiment provides an automatic dosing system of a water quality monitoring station, which comprises a main control unit, a turbidity detection circuit and a dosing control circuit, wherein the turbidity detection circuit and the dosing control circuit are connected with the main control unit, the dosing control circuit comprises a resistor R1, a resistor R2, a resistor R3, a triode Q1, a rheostat RP1, a resistor R4, a triode Q4, a resistor R5, a resistor R6, a field effect transistor Q2, a field effect transistor Q3, a resistor R7, a resistor R8 and a proportional electromagnetic valve, a first end of the resistor R1 is connected with the main control unit, a second end of the resistor R1 is connected with a base electrode of the triode Q1, a first end of the resistor R1 is connected with a 24V power supply through the resistor R2, a collector electrode of the triode Q1 is connected with the 24V power supply through the resistor R3, an emitter electrode of the triode Q1 is grounded, a first end of the triode RP1 is connected with a base electrode of the triode Q4 through the resistor R4, a base electrode of the triode Q4 is grounded through the resistor R4, and a second end of the triode RP1 is connected with a base electrode of the triode Q4 through the resistor R6; the grid electrode of the field effect tube Q2 is connected with the collector electrode of the triode Q4, the source electrode of the field effect tube Q2 is connected with a 24V power supply, the drain electrode of the field effect tube Q2 is connected with the first end of the proportional solenoid valve coil L1, the grid electrode of the field effect tube Q3 is connected with the emitter electrode of the triode Q4, the drain electrode of the field effect tube Q3 is connected with the second end of the proportional solenoid valve coil L1, the source electrode of the field effect tube Q3 is grounded through a resistor R7, the first end of a resistor R8 is connected with the drain electrode of the field effect tube Q2, and the second end of the resistor R8 is grounded.
In this embodiment, the medicament and water are mixed into a medicament liquid to be temporarily stored in the storage tank, the storage tank is connected with the electromagnetic proportional valve through a pipeline, and the medicament liquid is discharged into sewage to be treated through the electromagnetic proportional valve.
The turbidity detection circuit is used for detecting the turbidity of the sewage, the higher the turbidity of the sewage is, the more harmful substances in the sewage are indicated, the turbidity detection circuit converts the turbidity of the sewage into an electric signal and sends the electric signal to the main control unit, and the main control unit outputs PWM pulse control signals with different duty ratios to the input end of the dosing control circuit according to the electric signal sent by the turbidity detection circuit. The dosing control circuit controls the current flowing through the coil L1 of the proportional electromagnetic valve through PWM pulse control signals with different duty ratios, and controls the opening degree of the proportional electromagnetic valve, so that the flow of the medicament added into sewage is controlled. The current flowing through the proportional solenoid coil L1 is proportional to the opening of the proportional solenoid valve port.
Specifically, the working principle of the dosing control circuit is as follows: when the PWM signal output by the main control unit is at a low level, the transistor Q1 is turned off, and the 24V power supply forms a loop through the resistor R3, the varistor RP1 and the resistor R4, and the base of the transistor Q4 is at a high level, so that the transistor Q4 is turned on, and the voltage of the base of the transistor Q4 can be adjusted by the varistor RP 1. Under the condition that the triode Q4 is conducted, the grid voltage of the field effect tube Q3 is higher than the source voltage of the field effect tube Q3, and the grid voltage of the field effect tube Q2 is lower than the source voltage of the field effect tube Q2, so that the field effect tube Q2 and the field effect tube Q3 are conducted simultaneously, driving voltage is formed at two ends of a coil L1 of the proportional electromagnetic valve, current passes through the coil L1, and the proportional electromagnetic valve is opened.
When the PWM signal output by the main control unit is at a high level, the transistor Q1 is turned on, and the collector of the transistor Q1 is grounded, so that the transistor Q4 is turned off. At this time, the gate of the fet Q3 is at a low level, and the gate of the fet Q2 is at a high level, so that the fets Q2 and Q3 are turned off simultaneously, and thus the voltage across the coil L1 of the proportional solenoid valve immediately disappears, and the proportional solenoid valve is turned off.
In this embodiment, since the current flowing through the proportional solenoid valve coil L1 is proportional to the opening of the valve port of the proportional solenoid valve, when the turbidity detection circuit detects that the turbidity of the sewage is high, the master control unit increases the duty ratio of the output PWM signal to increase the average current flowing through the field effect transistor Q2 and the field effect transistor Q3, so that the current flowing through the proportional solenoid valve coil L1 is correspondingly increased, and the proportional solenoid valve increases the opening of the valve port to increase the dosage of the medicament added into the sewage.
As shown in fig. 2, the dosing control circuit in this embodiment further includes a resistor R15, an optocoupler U3, a resistor R16, and a resistor R17, where a first input end of the optocoupler U3 is connected to the main control unit through the resistor R15, a second input end of the optocoupler U3 is grounded, a first output end of the optocoupler U3 is connected to a 5V power supply through the resistor R16, and a second output end of the optocoupler U3 is connected to a first end of the resistor R1 through the resistor R17.
Because the driving capability of the PWM pulse control signal output by the main control unit is weak, the proportional electromagnetic valve cannot be normally opened or closed, and therefore, an isolation driving circuit is arranged between the main control unit and the dosing control circuit in the embodiment.
The isolation driving circuit is composed of a resistor R15, an optocoupler U3, a resistor R16 and a resistor R17, wherein the optocoupler U3 is used for improving the driving capability of PWM signals, when the PWM signals output by the main control unit are low level, the optocoupler U3 is cut off, the optocoupler U3 outputs low level signals to the base electrode of the triode Q1, when the PWM signals output by the main control unit are high level, the optocoupler U3 is conducted, and the optocoupler U3 outputs high level signals to the base electrode of the triode Q1. The optical coupler U3 can also play a role in signal isolation.
As shown in fig. 3, the embodiment further includes a current detection circuit, where the current detection circuit includes a resistor R10, a resistor R11, a resistor R14, an operational amplifier U1, a resistor R9, a resistor R12, and an operational amplifier U2, where an inverting input end of the operational amplifier U1 is connected to a first end of the resistor R8 through the resistor R10, an non-inverting input end of the operational amplifier U1 is connected to a source electrode of the field effect transistor Q3 through the resistor R11, the non-inverting input end of the operational amplifier U1 is grounded through the resistor R14, an output end of the operational amplifier U1 is connected to an inverting input end of the operational amplifier U1 through the resistor R9, an output end of the operational amplifier U1 is connected to an non-inverting input end of the operational amplifier U2 through the resistor R12, and an output end of the operational amplifier U2 is connected to the master control unit.
In this embodiment, in order to ensure that the operation of the proportional solenoid valve is more stable, a current detection circuit is further provided to determine whether the operation state of the proportional solenoid valve is stable by the current flowing through the proportional solenoid valve coil L1.
The voltages at the two ends of the resistor R7 and the resistor R8 are collected to obtain the voltages at the two ends of the coil L1 when the proportional solenoid valve works, and the voltages at the two ends of the coil L1 can obtain the current flowing through the coil L1. The voltage at two ends of the resistor R7 is added to the non-inverting input end of the operational amplifier U1 after passing through the resistor R11, the voltage at two ends of the resistor R8 is added to the inverting input end of the operational amplifier U1 after passing through the resistor R10, the operational amplifier U1 forms a differential amplifying circuit, the differential amplifying circuit can improve the stability of the circuit and the common mode rejection ratio of the circuit, a voltage signal amplified by the operational amplifier U1 is sent to the main control unit after passing through a follower formed by the operational amplifier U2, the follower can play a role of signal isolation, and a filter circuit is added between the output end of the operational amplifier U1 and the main control unit and is formed by the resistor R13 and the capacitor C2 and used for filtering high-frequency clutter in the signal.
As shown in fig. 4, the turbidity detection circuit in this embodiment includes an infrared emission circuit and an infrared receiving circuit, the infrared emission circuit includes a resistor R21, a resistor R20, an operational amplifier U4, a resistor R19, a resistor R18, a resistor R22, a triode Q5, a resistor R23, a resistor R24, a resistor R25, an infrared emitter U5 and a field effect transistor Q6, a first end of the resistor R21 is connected to a 12V power supply, a second end of the resistor R21 is connected to an in-phase input end of the operational amplifier U4 through the resistor R20, an inverting input end of the operational amplifier U4 is grounded through the resistor R19, an output end of the operational amplifier U4 is connected to a base electrode of the triode Q5 through the resistor R22, a collector electrode of the triode Q5 is connected to a 12V power supply, an emitter electrode of the triode Q5 is connected to a first end of the triode Q23 through the resistor R18, a second end of the resistor R23 is connected to an in-phase input end of the operational amplifier U4 through the resistor R24, a second end of the resistor R23 is connected to a first end of the infrared emitter U5, a second end of the infrared emitter U5 is connected to a drain electrode of the field effect transistor Q6.
The turbidity of sewage will be lower as the turbidity of sewage will be higher as the content of harmful substances or organic matters in sewage is higher, the turbidity of sewage will be lower as the photoelectric sensor detects through this embodiment, photoelectric sensor includes infrared transmitter and infrared receiver, place photoelectric sensor in sewage, infrared transmitting circuit is arranged in controlling infrared transmitter and sends infrared light, infrared receiver changes the optical signal received into the electrical signal through infrared receiving circuit when receiving infrared light and sends to main control unit, main control unit can judge the turbidity of sewage through the size of the electrical signal received.
Specifically, the working principle of the infrared emission circuit is as follows: the operational amplifier U4 and the triode Q5 form a constant current circuit, when the circuit is electrified, a 12V power supply is added to the non-inverting input end of the operational amplifier U4 through the resistor R21 and the resistor R20, wherein the resistance values of the resistor R19, the resistor R20, the resistor R18 and the resistor R24 are equal, the voltage stabilizing tube D4 ensures that the voltage input to the non-inverting input end of the operational amplifier U4 is always in a stable state, when the circuit is electrified, the operational amplifier U4 outputs a high level, the triode Q5 is conducted at the moment, the emitter voltage of the triode Q5 is added to the inverting input end of the operational amplifier U4 after passing through the resistor R18, and the non-inverting input end and the inverting input end of the operational amplifier U4 are identical in voltage, so long as the input voltage of the operational amplifier U4 is stable, and the current flowing through the resistor R25 is stable.
When the infrared emitter U5 works, the main control unit outputs a square wave pulse signal, when the pulse signal is in a high level, the field effect transistor Q6 is conducted, namely, current passes through the infrared emitter U5 and the field effect transistor Q6 and then reaches the ground, and at the moment, the infrared emitter U5 emits infrared light; when the pulse signal is at a low level, the field effect transistor Q6 is turned off, and the infrared emitter U5 does not emit light.
As shown in fig. 5, in this embodiment, the infrared receiving circuit includes a resistor R26, a resistor R27, an infrared receiver U7, a capacitor C5, a capacitor C6, a resistor R28, a resistor R29, a resistor R30, an operational amplifier U6, a capacitor C8, a resistor R31, an operational amplifier U8, a resistor R32, a resistor R33, and a resistor R34, where a first end of the resistor R26 is connected to a 5V power supply, a second end of the resistor R26 is connected to a first end of the infrared receiver U7, a second end of the infrared receiver U7 is grounded through the resistor R27, a first end of the capacitor C5 is connected to a second end of the resistor R26, a second end of the capacitor C5 is connected to an inverting input end of the operational amplifier U6 through the resistor R28, a first end of the capacitor C6 is connected to an non-inverting input end of the operational amplifier U6, and an output end of the operational amplifier U6 is connected to an inverting input end of the operational amplifier U6 through the resistor R30; the output end of the operational amplifier U6 is connected with the first end of the resistor R31 through the capacitor C8, the second end of the resistor R31 is connected with the inverting input end of the operational amplifier U8, the non-inverting input end of the operational amplifier U8 is connected with a 5V power supply through the resistor R33, the non-inverting input end of the operational amplifier U8 is grounded through the resistor R34, the output end of the operational amplifier U8 is connected with the inverting input end of the operational amplifier U8 through the resistor R32, and the output end of the operational amplifier U8 is connected with the main control unit.
In this embodiment, the infrared receiver U7 is configured to receive infrared light sent by the infrared transmitter U5, the infrared receiver U7 converts a received infrared light signal into an electrical signal, and because the electrical signal generated by the infrared receiver U7 is weak, the electrical signal is amplified, the electrical signals at two ends of the infrared receiver U7 are added to the input end of the operational amplifier U6, the operational amplifier U6 forms a first-stage differential amplification circuit, the amplified electrical signal is filtered by the capacitor C8 and then added to the inverting input end of the operational amplifier U8, the operational amplifier U8 forms a second-stage differential amplification circuit, and finally the amplified signal is sent to the main control unit, the main control unit determines the turbidity of the sewage according to the received voltage, and the turbidity of the sewage is in proportion to the signal received by the main control unit, that is, the higher the voltage received by the main control unit is, the higher the turbidity of the sewage is, and the lower is the opposite.
In order to improve the detection precision of the circuit, the electric signal output by the operational amplifier U8 is filtered by a filter circuit formed by the resistor R35 and the capacitor C10 and then is sent to the main control unit, and the filter circuit is used for filtering high-frequency clutter in the electric signal output by the operational amplifier U8. The common mode rejection ratio of the circuit can be improved by adopting the differential amplifying circuit, and the purpose of adopting the differential amplifying circuit in two stages is to reduce noise interference.
The foregoing description of the preferred embodiments of the utility model 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 utility model.
Claims (5)
1. The automatic dosing system of the water quality monitoring station is characterized by comprising a main control unit, a turbidity detection circuit and a dosing control circuit, wherein the turbidity detection circuit and the dosing control circuit are connected with the main control unit, the dosing control circuit comprises a resistor R1, a resistor R2, a resistor R3, a triode Q1, a rheostat RP1, a resistor R4, a triode Q4, a resistor R5, a resistor R6, a field effect transistor Q2, a field effect transistor Q3, a resistor R7, a resistor R8 and a proportional electromagnetic valve,
the first end of the resistor R1 is connected with the main control unit, the second end of the resistor R1 is connected with the base electrode of the triode Q1, the first end of the resistor R1 is connected with a 24V power supply through the resistor R2, the collector electrode of the triode Q1 is connected with the 24V power supply through the resistor R3, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the first end of the rheostat RP1, the second end of the rheostat RP1 is connected with the base electrode of the triode Q4, the base electrode of the triode Q4 is grounded through the resistor R4, the collector electrode of the triode Q4 is connected with the 24V power supply through the resistor R5, and the emitter electrode of the triode Q4 is grounded through the resistor R6;
the grid electrode of the field effect tube Q2 is connected with the collector electrode of the triode Q4, the source electrode of the field effect tube Q2 is connected with a 24V power supply, the drain electrode of the field effect tube Q2 is connected with the first end of the proportional solenoid valve coil L1, the grid electrode of the field effect tube Q3 is connected with the emitter electrode of the triode Q4, the drain electrode of the field effect tube Q3 is connected with the second end of the proportional solenoid valve coil L1, the source electrode of the field effect tube Q3 is grounded through the resistor R7, the first end of the resistor R8 is connected with the drain electrode of the field effect tube Q2, and the second end of the resistor R8 is grounded.
2. The automatic dosing system of a water quality monitoring station according to claim 1, wherein the dosing control circuit further comprises a resistor R15, an optocoupler U3, a resistor R16 and a resistor R17, wherein a first input end of the optocoupler U3 is connected with the main control unit through the resistor R15, a second input end of the optocoupler U3 is grounded, a first output end of the optocoupler U3 is connected with a 5V power supply through the resistor R16, and a second output end of the optocoupler U3 is connected with a first end of the resistor R1 through the resistor R17.
3. The automatic dosing system of a water quality monitoring station according to claim 1, further comprising a current detection circuit, wherein the current detection circuit comprises a resistor R10, a resistor R11, a resistor R14, an operational amplifier U1, a resistor R9, a resistor R12 and an operational amplifier U2, wherein an inverting input end of the operational amplifier U1 is connected with a first end of the resistor R8 through the resistor R10, an inverting input end of the operational amplifier U1 is connected with a source electrode of the field effect transistor Q3 through the resistor R11, the inverting input end of the operational amplifier U1 is grounded through the resistor R14, an output end of the operational amplifier U1 is connected with an inverting input end of the operational amplifier U1 through the resistor R9, an output end of the operational amplifier U1 is connected with an inverting input end of the operational amplifier U2 through the resistor R12, an output end of the operational amplifier U2 is connected with an inverting input end of the operational amplifier U2, and an output end of the operational amplifier U2 is connected with the main control unit.
4. The automatic dosing system of a water quality monitoring station according to claim 1, wherein the turbidity detection circuit comprises an infrared emission circuit and an infrared receiving circuit, the infrared emission circuit comprises a resistor R21, a resistor R20, an operational amplifier U4, a resistor R19, a resistor R18, a resistor R22, a triode Q5, a resistor R23, a resistor R24, a resistor R25, an infrared emitter U5 and a field effect transistor Q6,
the first end of the resistor R21 is connected with a 12V power supply, the second end of the resistor R21 is connected with the in-phase input end of the operational amplifier U4 through the resistor R20, the anti-phase input end of the operational amplifier U4 is grounded through the resistor R19, the output end of the operational amplifier U4 is connected with the base electrode of the triode Q5 through the resistor R22, the collector electrode of the triode Q5 is connected with the 12V power supply, the emitter electrode of the triode Q5 is connected with the anti-phase input end of the operational amplifier U4 through the resistor R18, the emitter electrode of the triode Q5 is connected with the first end of the resistor R23, the second end of the resistor R23 is connected with the in-phase input end of the operational amplifier U4 through the resistor R24, the second end of the resistor R23 is connected with the first end of the infrared emitter U5 through the resistor R25, the second end of the infrared emitter U5 is connected with the drain electrode of the field effect transistor Q6, the grid electrode of the field effect transistor Q6 is connected with the main control unit, and the source electrode of the field effect transistor Q6 is grounded.
5. The automatic water quality monitoring station dosing system according to claim 4, wherein the infrared receiving circuit comprises a resistor R26, a resistor R27, an infrared receiver U7, a capacitor C5, a capacitor C6, a resistor R28, a resistor R29, a resistor R30, an operational amplifier U6, a capacitor C8, a resistor R31, an operational amplifier U8, a resistor R32, a resistor R33 and a resistor R34,
the first end of the resistor R26 is connected with a 5V power supply, the second end of the resistor R26 is connected with the first end of the infrared receiver U7, the second end of the infrared receiver U7 is grounded through the resistor R27, the first end of the capacitor C5 is connected with the second end of the resistor R26, the second end of the capacitor C5 is connected with the inverting input end of the operational amplifier U6 through the resistor R28, the first end of the capacitor C6 is connected with the second end of the infrared receiver U7, the second end of the capacitor C6 is connected with the non-inverting input end of the operational amplifier U6 through the resistor R29, and the output end of the operational amplifier U6 is connected with the inverting input end of the operational amplifier U6 through the resistor R30;
the output end of the operational amplifier U6 is connected with the first end of the resistor R31 through the capacitor C8, the second end of the resistor R31 is connected with the inverting input end of the operational amplifier U8, the non-inverting input end of the operational amplifier U8 is connected with a 5V power supply through the resistor R33, the non-inverting input end of the operational amplifier U8 is grounded through the resistor R34, the output end of the operational amplifier U8 is connected with the inverting input end of the operational amplifier U8 through the resistor R32, and the output end of the operational amplifier U8 is connected with the main control unit.
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| CN202223151127.2U CN219533106U (en) | 2022-11-26 | 2022-11-26 | Automatic dosing system of water quality monitoring station |
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