Electromagnetic valve driving circuit, control method and cleaning method of water quality monitoring system

Abstract

The invention discloses an electromagnetic valve driving circuit, a control method and a cleaning method of a water quality monitoring system, which have the advantages that a chip of the electromagnetic valve driving circuit is provided with a first signal access pin and a second signal access pin which are used for receiving control signals; the first output pin and the second output pin are electrically connected with the two electrodes of the self-locking electromagnetic valve respectively, a capacitor is connected between the first output pin and the second output pin, the working state of the self-locking electromagnetic valve can be switched only with little electric quantity, and a basis is provided for achieving little energy consumption of the cleaning method of the water quality monitoring system.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring equipment and control methods, and in particular to a solenoid valve drive circuit, a control method and a cleaning method of a water quality monitoring system. Background Art

[0002] With the development of social economy and the improvement of people's living standards, higher and higher requirements are put forward for the quality of tap water supply. In order to achieve this goal, multi-parameter water quality monitoring technology of tap water supply network came into being. This measure is a powerful means to ensure that the quality of tap water supply meets the standards.

[0003] Existing water quality monitoring systems all use solenoid valves to control the on-off of the measuring water path. When cleaning and testing the water quality monitoring system, the solenoid valve needs to remain open for a period of time. After starting, the traditional normally closed solenoid valve needs to continuously apply voltage to both ends of the coil to maintain sufficient magnetic force to attract the valve switch and keep it in the open state. Once the voltage is stopped, the coil magnetic force disappears, and the solenoid valve will immediately return to the state before starting, which consumes more power. The solenoid valve with a self-locking function can stop applying voltage to the coil after opening, and the valve still remains in the open state. When a reverse voltage is applied to both ends of the coil, the valve will return to its original state and remain in this state after the voltage is disconnected. Compared with traditional solenoid valves, the power-on time of self-locking solenoid valves is greatly shortened, thereby reducing power consumption.

[0004] The purpose of the present invention is to develop a driving circuit for a self-locking solenoid valve used in a water quality monitoring system, a control method for the self-locking solenoid valve, and a cleaning method for self-cleaning the water quality monitoring system using the self-locking solenoid valve. Summary of the invention

[0005] The embodiments of the present invention provide a solenoid valve driving circuit and a control method of a self-locking solenoid valve with low energy consumption, and a cleaning method for a water quality monitoring system to perform self-cleaning.

[0006] The technical solution adopted by the present driving circuit to solve the above-mentioned problem is: a solenoid valve driving circuit, on which a first signal access pin and a second signal access pin for receiving a control signal are provided on the chip, and a first output pin and a second output pin are provided which are respectively electrically connected to the two poles of the self-locking solenoid valve, and a capacitor is connected between the first output pin and the second output pin; When no control signal is received, the first signal access pin and the second signal access pin are at a low level, the first output pin and the second output pin have no voltage output, and the self-locking solenoid valve maintains the original state; When receiving an opening signal, the first signal access pin is at a high level and the second signal access pin is at a low level, the first output pin outputs a positive voltage, the second output pin outputs a negative voltage, and the self-locking solenoid valve is switched to an open state; When a closing signal is received, the first signal access pin is at a low level and the second signal access pin is at a high level, the first output pin outputs a negative voltage, the second output pin outputs a positive voltage, and the self-locking solenoid valve is switched to a closed state.

[0007] The technical solution adopted by the control method to solve another problem is: a control method for controlling a self-locking solenoid valve based on the above-mentioned solenoid valve drive circuit, when controlling the self-locking solenoid valve to perform a valve opening action, a high-level signal is input to the first signal access pin, and a low-level signal is input to the second signal access pin, the first output pin outputs a positive voltage, and the second output pin outputs a negative voltage. After maintaining for 50ms, the first signal access pin and the second signal access pin return to a low level, the first output pin and the second output pin have no voltage output, and the self-locking solenoid valve is switched to an open state; Or when controlling the self-locking solenoid valve to perform the valve opening action, a low-level signal is input to the first signal access pin, and a high-level signal is input to the second signal access pin, the first output pin outputs a negative voltage, and the second output pin outputs a positive voltage. After maintaining for 50ms, the first signal access pin and the second signal access pin return to a low level, the first output pin and the second output pin have no voltage output, and the self-locking solenoid valve switches to a closed state. Compared with the prior art, the technical solution of the solenoid valve drive circuit and control method has the advantage that less electricity is needed to switch the working state of the self-locking solenoid valve, providing a basis for realizing lower energy consumption in the cleaning method of the water quality monitoring system.

[0008] The cleaning method solves another problem and adopts a technical solution: a cleaning method for a water quality monitoring system, which specifically includes the following steps: S1. Start cleaning tasks regularly; S2, RTU detects whether the first self-locking solenoid valve is in the open state, if yes, it goes to step S4, otherwise it goes to step S3; S3, RTU sends an opening signal to the solenoid valve driving circuit of the first self-locking solenoid valve to open the first self-locking solenoid valve; S4, RTU sends an opening signal to the solenoid valve driving circuit of the second self-locking solenoid valve to open the second self-locking solenoid valve; S5, cleaning time setting; S6, RTU detects whether the first self-locking solenoid valve is in the open state, if yes, it goes to step S7, otherwise it goes to step S8; S7, RTU sends a closing signal to the solenoid valve driving circuit of the first self-locking solenoid valve to close the first self-locking solenoid valve; S8, RTU sends a closing signal to the solenoid valve driving circuit of the second self-locking solenoid valve to close the second self-locking solenoid valve; S9, end the cleaning task; Wherein, the solenoid valve driving circuit of the first self-locking solenoid valve and the solenoid valve driving circuit of the second self-locking solenoid valve are both the above-mentioned solenoid valve driving circuits.

[0009] Compared with the existing technology, the advantage of this cleaning method is that after starting the cleaning task, only a small amount of electricity is needed to open the first self-locking solenoid valve and the second self-locking solenoid valve, and the first self-locking solenoid valve and the second self-locking solenoid valve are closed after a set cleaning time, thereby realizing self-cleaning of the water quality monitoring system with low energy consumption.

[0010] Preferably, the second self-locking solenoid valve is arranged on a cleaning bypass between the water quality analysis module and the drain pipe, and a throttle valve is arranged between the water quality analysis module and the drain pipe, so as to reduce the amount of water wasted during detection and provide a faster water flow for flushing during cleaning.

[0011] As an improvement, the water quality analysis module includes a measuring chamber connected to the measuring waterway and multiple types of water quality sensors connected to the interfaces of the measuring chamber. The measuring chamber is a flow pool formed by assembling multiple sensor mounting seats. It can be freely assembled and disassembled according to the number of water quality monitoring parameters, and can also be modularly maintained to reduce maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a circuit diagram of the solenoid valve driving circuit of the present invention.

[0013] Figure 2 It is a working principle diagram of the water quality monitoring system of the present invention.

[0014] Figure 3 It is a right side stereogram of the water quality monitoring system of the present invention.

[0015] Figure 4 It is a control circuit diagram of the water quality monitoring system of the present invention.

[0016] Figure 5 It is a flow chart of the cleaning method of the water quality monitoring system of the present invention. DETAILED DESCRIPTION

[0017] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0018] This preferred embodiment is for example Figure 3 The figure shows a water quality monitoring system, comprising a battery 1 and a controller 2 installed in the upper part of a box body 11, and a communication module for uploading water quality monitoring data, the communication module comprising an antenna arranged outside the box body 11, a filter 3, a pressure reducing valve 4, a first self-locking solenoid valve 5 and a water quality analysis module 6 for measuring multiple water quality parameters arranged in the lower part of the box body 11 and connected in sequence to the measuring water path, the communication module and the water quality analysis module 6 are electrically connected to the controller 2 respectively, a constant current limiting device is provided between the water quality analysis module 6 and the drain pipe, and the constant current limiting device is a throttle valve 8; a cleaning bypass is connected between the water quality analysis module 6 and the drain pipe, and a second self-locking solenoid valve 7 is provided on the cleaning bypass; the first self-locking solenoid valve 5 and the second self-locking solenoid valve 7 are electrically connected to the controller 2 through their respective solenoid valve drive circuits.

[0019] In this embodiment, if Figure 4 As shown, the controller 2 is an RTU, i.e., a remote terminal control unit, which can be connected to a wired network via a serial port, or connected to a mobile phone APP of a nearby water quality detection manager via Bluetooth, or upload water quality monitoring data to a water quality monitoring platform via other wireless communication modules.

[0020] The water quality analysis module 6 includes a measuring cavity (not shown in the figure) connected to the measuring water path and multiple types of water quality sensors and a collection line 9 connected to each interface of the measuring cavity, and the multiple types of water quality sensors are electrically connected to the controller 2 through the collection line 9. The multiple types of water quality sensors are residual chlorine sensors, pH sensors, turbidity sensors, conductivity sensors, etc. Here, the measuring cavity is a flow pool formed by assembling multiple sensor mounting seats, and the number of sensor mounting seats can be increased or decreased according to the number of water quality parameters that need to be detected.

[0021] A quick-plug water connector 12 is provided on one side of the box body 11, and the quick-plug water connector 12 is used to connect the sample injection tube. The quick-plug water connector 12 is connected to the filter 3 through a hose; a first quick-plug water outlet 13 and a second quick-plug water outlet 14 are provided on the other side of the box body 11, and the first quick-plug water outlet 13 and the second quick-plug water outlet 14 are connected to the measuring chamber through a three-way joint (not marked in the figure), the throttle valve 8 is connected between the three-way joint and the first quick-plug water outlet 13, and the second self-locking solenoid valve 7 is connected between the three-way joint and the second quick-plug water outlet 14.

[0022] In this embodiment, the solenoid valve driving circuits of the first self-locking solenoid valve 5 and the second self-locking solenoid valve 7 are as follows: Figure 1 As shown, the chip U1 adopts L9110S, and the chip U1 is provided with a first signal access pin IB and a second signal access pin IA for receiving a control signal, the first signal access pin IB is connected to the execution pin IO2 of the RTU, the second signal access pin IA is connected to the execution pin IO3 of the RTU, and is also provided with a first output pin outA and a second output pin outB respectively electrically connected to the two poles of the self-locking solenoid valve, and a capacitor C1 is connected between the first output pin outA and the second output pin outB; When no control signal is received, the first signal access pin IB and the second signal access pin IA are at a low level, the first output pin outA and the second output pin outB have no voltage output, and the self-locking solenoid valve maintains the original state; When receiving the opening signal, the first signal access pin IB is at a high level and the second signal access pin IA is at a low level, the first output pin outA outputs a positive voltage, the second output pin outB outputs a negative voltage, and the self-locking solenoid valve is switched to the opening state; When a closing signal is received, the first signal access pin IB is at a low level and the second signal access pin IA is at a high level, the first output pin outA outputs a negative voltage, the second output pin outB outputs a positive voltage, and the self-locking solenoid valve is switched to a closed state.

[0023] The control method of the first self-locking solenoid valve 5 and the second self-locking solenoid valve 7 is as follows: when the self-locking solenoid valve is controlled to perform the valve opening action, IO2 inputs a high-level signal to the first signal access pin IB, and IO3 inputs a low-level signal to the second signal access pin IA, the first output pin outA outputs a positive voltage, and the second output pin outB outputs a negative voltage. After 50ms, IO2 and IO3 have no voltage, the first signal access pin IB and the second signal access pin IA return to a low level, the first output pin outA and the second output pin outB have no voltage output, and the self-locking solenoid valve is switched to an open state; or when the self-locking solenoid valve is controlled to perform the valve opening action, IO2 inputs a low-level signal to the first signal access pin IB, and IO3 inputs a high-level signal to the second signal access pin IA, the first output pin outA outputs a negative voltage, and the second output pin outB outputs a positive voltage. After 50ms, IO2 and IO3 have no voltage, the first signal access pin IB and the second signal access pin IA return to a low level, the first output pin outA and the second output pin outB have no voltage output, and the self-locking solenoid valve is switched to a closed state.

[0024] like Figure 2 As shown, during measurement, RTU controls the opening of the first self-locking solenoid valve 5, and RTU supplies power to the residual chlorine sensor, pH sensor, turbidity sensor and conductivity sensor. The cavity is filled with sample water, which flows slowly in small amounts under the action of the throttle valve 8, and the residual chlorine sensor, pH sensor, turbidity sensor and conductivity sensor measure accurate water quality parameters; during the measurement interval, RTU controls the closing of the first self-locking solenoid valve 5, so that the water flow completely stops flowing into the measurement cavity; during the measurement interval, when regular flushing is required, RTU controls the opening of the first self-locking solenoid valve 5 and the second self-locking solenoid valve 7, and the flushing water is discharged from the throttle valve 8 and the clean bypass to the drain pipe, and is mainly discharged from the clean bypass at a faster flow rate.

[0025] Cleaning methods for water quality monitoring systems, such as Figure 5 As shown, the specific steps include: S1. Start cleaning tasks regularly; S2, RTU detects whether the first self-locking solenoid valve 5 is in the open state, if yes, it goes to step S4, otherwise it goes to step S3; S3, RTU sends an opening signal to the solenoid valve driving circuit of the first self-locking solenoid valve 5 to open the first self-locking solenoid valve 5; S4, RTU sends an opening signal to the solenoid valve driving circuit of the second self-locking solenoid valve 7 to open the second self-locking solenoid valve 7; S5, cleaning fixed time N4, N4 is the cleaning time stored in the RTU logic program; S6, RTU detects whether the first self-locking solenoid valve 5 is in the open state, if yes, it goes to step S7, otherwise it goes to step S8; S7, RTU sends a closing signal to the solenoid valve driving circuit of the first self-locking solenoid valve 5 to close the first self-locking solenoid valve 5; S8, RTU sends a closing signal to the solenoid valve driving circuit of the second self-locking solenoid valve 7 to close the second self-locking solenoid valve 7; S9, end the cleaning task.

[0026] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solenoid valve drive circuit, characterized in that: The chip is provided with a first signal access pin and a second signal access pin for receiving a control signal, and is also provided with a first output pin and a second output pin respectively electrically connected to the two poles of the self-locking solenoid valve, and a capacitor is connected between the first output pin and the second output pin; When no control signal is received, the first signal access pin and the second signal access pin are at a low level, the first output pin and the second output pin have no voltage output, and the self-locking solenoid valve maintains the original state; When receiving an opening signal, the first signal access pin is at a high level and the second signal access pin is at a low level, the first output pin outputs a positive voltage, the second output pin outputs a negative voltage, and the self-locking solenoid valve is switched to an open state; When a closing signal is received, the first signal access pin is at a low level and the second signal access pin is at a high level, the first output pin outputs a negative voltage, the second output pin outputs a positive voltage, and the self-locking solenoid valve is switched to a closed state.

2. A control method for controlling a self-locking solenoid valve based on the solenoid valve drive circuit of claim 1, characterized in that: When controlling the self-locking solenoid valve to perform the valve opening action, a high-level signal is input to the first signal access pin, and a low-level signal is input to the second signal access pin. The first output pin outputs a positive voltage, and the second output pin outputs a negative voltage. After 50ms, the first signal access pin and the second signal access pin return to a low level, and the first output pin and the second output pin have no voltage output, and the self-locking solenoid valve is switched to the open state; Or when controlling the self-locking solenoid valve to perform the valve opening action, a low-level signal is input to the first signal access pin, and a high-level signal is input to the second signal access pin, the first output pin outputs a negative voltage, and the second output pin outputs a positive voltage. After maintaining for 50ms, the first signal access pin and the second signal access pin return to a low level, the first output pin and the second output pin have no voltage output, and the self-locking solenoid valve switches to a closed state.

3. A method for cleaning a water quality monitoring system, characterized in that: The specific steps include: S1. Start cleaning tasks regularly; S2, RTU detects whether the first self-locking solenoid valve is in the open state, if yes, it goes to step S4, otherwise it goes to step S3; S3, RTU sends an opening signal to the solenoid valve driving circuit of the first self-locking solenoid valve to open the first self-locking solenoid valve; S4, RTU sends an opening signal to the solenoid valve driving circuit of the second self-locking solenoid valve to open the second self-locking solenoid valve; S5, cleaning time setting; S6, RTU detects whether the first self-locking solenoid valve is in the open state, if yes, it goes to step S7, otherwise it goes to step S8; S7, RTU sends a closing signal to the solenoid valve driving circuit of the first self-locking solenoid valve to close the first self-locking solenoid valve; S8, RTU sends a closing signal to the solenoid valve driving circuit of the second self-locking solenoid valve to close the second self-locking solenoid valve; S9, end the cleaning task; Wherein, the solenoid valve driving circuit of the first self-latching solenoid valve and the solenoid valve driving circuit of the second self-latching solenoid valve are both the solenoid valve driving circuits as claimed in claim 1.

4. A method for cleaning a water quality monitoring system according to claim 3, characterized in that: The second self-locking solenoid valve is arranged on a clean bypass between the water quality analysis module and the drain pipe, and a throttle valve is arranged between the water quality analysis module and the drain pipe.

5. A method for cleaning a water quality monitoring system according to claim 4, characterized in that: The water quality analysis module includes a measuring cavity connected to a measuring water path and multiple types of water quality sensors connected to various interfaces of the measuring cavity. The measuring cavity is a flow pool formed by assembling multiple sensor mounting seats.

Images