Variable frequency control system of CCRO water purifier

Abstract

The utility model provides a CCRO water purifier frequency conversion control system, which belongs to the technical field of water purifier control and comprises a main controller, a digital quantity input / output module, an analog quantity input module, an analog quantity output module, a frequency converter module, an intermediate relay module, an electromagnetic valve module and a sensor module. The input end of the main controller is connected with the signal output end of the digital quantity input / output module, and the output end of the main controller is connected to the electromagnetic valve module through the intermediate relay module; the signal input end of the digital quantity input / output module is connected with a button; the signal input end of the analog input module is connected with the sensor module; the sensor module is connected with a water purifier water pump; the signal output end of the analog quantity output module is connected with the frequency converter module; the frequency converter module is connected with a water purifier water pump motor. Frequency conversion adjustment of the water purifier is achieved, energy is remarkably saved, the water purification efficiency is effectively improved, and the service life of the RO membrane is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of water purifier control technology, specifically a CCRO water purifier frequency conversion control system. Background Technology

[0002] Reverse osmosis (RO) water purification systems, as core equipment in the water treatment field, are widely used in drinking water purification, industrial water use, and other scenarios. Traditional RO systems often employ fixed-frequency control for their pump units, making it impossible to adjust operating parameters in real time according to water quality and quantity requirements, leading to increased energy consumption. Significant system pressure fluctuations and frequent start-stop or overload operation can easily cause mechanical damage to RO membrane elements, shortening equipment lifespan. Traditional control systems rely on manual adjustment of valves and parameters, lacking real-time data feedback and closed-loop control capabilities, making it difficult to accurately maintain stable product water quality, and resulting in high costs for troubleshooting and maintenance.

[0003] With the increasing demands for energy conservation and environmental protection and the development of industrial automation technology, variable frequency technology has demonstrated significant energy-saving advantages in the field of industrial transmission by adjusting the motor speed to achieve dynamic matching of flow and pressure. However, its application in RO water purification systems still faces problems such as insufficient precision in multi-device collaborative control, sensor feedback lag, and low system integration. How to combine variable frequency control with PLC, achieve dynamic adjustment of water pump speed through multi-module collaboration, and build an integrated control system with real-time monitoring, intelligent adjustment, and fault early warning functions has become a key technical direction for improving the stability and energy efficiency of RO water purification systems. Utility Model Content

[0004] This invention addresses the problems of insufficient frequency conversion control accuracy, sensor feedback lag, and low system integration in existing RO water purification systems by providing a CCRO water purifier frequency conversion control system:

[0005] The system comprises a main controller, a digital input / output module, an analog input module, an analog output module, a frequency converter module, an intermediate relay module, a solenoid valve module, and a sensor module. The input terminal of the main controller is connected to the signal output terminal of the digital input / output module, and the output terminal of the main controller is connected to the solenoid valve module via the intermediate relay module. A button is connected to the signal input terminal of the digital input / output module. The signal input terminal of the analog input module is connected to the sensor module. The sensor module is connected to a water purifier pump. The signal output terminal of the analog output module is connected to the frequency converter module. The frequency converter module is connected to the water purifier pump motor.

[0006] Furthermore, the frequency converter module includes a first frequency converter, a second frequency converter, a third frequency converter, and a fourth frequency converter. The first frequency converter is connected to a first RO raw water pump motor, the second frequency converter is connected to a second RO raw water pump motor, the third frequency converter is connected to an RO high-pressure pump motor, and the fourth frequency converter is connected to an RO circulation pump motor.

[0007] Furthermore, the solenoid valve module includes an inlet solenoid valve, a concentrate solenoid valve, a first counter-flushing solenoid valve, a second counter-flushing solenoid valve, a third counter-flushing solenoid valve, and a fourth counter-flushing solenoid valve.

[0008] Furthermore, the intermediate relay module includes a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay, a fifth intermediate relay, a sixth intermediate relay, a seventh intermediate relay, an eighth intermediate relay, and a ninth intermediate relay. The first intermediate relay is connected to a first RO raw water pump, the second intermediate relay is connected to an RO high-pressure pump, the third intermediate relay is connected to an RO circulation pump, the fourth intermediate relay is connected to the inlet solenoid valve, the fifth intermediate relay is connected to the concentrate solenoid valve, the sixth intermediate relay is connected to the first counter-flushing solenoid valve, the seventh intermediate relay is connected to the second counter-flushing solenoid valve, the eighth intermediate relay is connected to the third counter-flushing solenoid valve, and the ninth intermediate relay is connected to the fourth counter-flushing solenoid valve.

[0009] Furthermore, it also includes a circuit breaker module, comprising a first circuit breaker, a second circuit breaker, a third circuit breaker, and a fourth circuit breaker. The first circuit breaker is connected to the first RO raw water pump motor, the second circuit breaker is connected to the second RO raw water pump motor, the third circuit breaker is connected to the RO high-pressure pump motor, and the fourth circuit breaker is connected to the RO circulating pump motor.

[0010] Furthermore, it also includes an alarm unit, which includes a buzzer connected to the main controller via a relay.

[0011] Furthermore, it also includes a display touchscreen, which is connected to the digital input / output module via a data cable.

[0012] Furthermore, it also includes a switching power supply, which outputs 24V DC power to power the main controller and the display touch screen.

[0013] Furthermore, the main controller adopts the Siemens S7-200SMART series 6ES7 288-1SR60 programmable controller.

[0014] Furthermore, the digital input / output module adopts a 6ES7 288-2DR32 expansion module; the analog input module adopts three 6ES7 288-3AE08 expansion modules; and the analog output module adopts two 6ES7 288-3AQ04 expansion modules.

[0015] The beneficial effects of this utility model are as follows:

[0016] By connecting the frequency converter module to the main controller, the system can dynamically adjust the pump motor speed according to real-time water quality and quantity requirements. Under low load conditions, it automatically reduces pump speed, lowers energy consumption, and reduces frequent start-stop operations and mechanical wear, extending the service life of the pump and RO membrane elements and significantly reducing maintenance costs. The sensor module collects the water purifier pump pressure parameters in real time and feeds them back to the PLC main controller. Combined with the analog input / output module, it realizes dynamic closed-loop regulation of pressure and flow, effectively avoiding membrane element damage or product water quality fluctuations caused by pressure fluctuations, improving product water stability and equipment operational reliability. The solenoid valve module is connected to the main controller through the relay module, enabling the main controller to control the water purifier's solenoid valves. This system, through modular connection, achieves dual protection of frequency converter control and valve control for the water purifier, reducing installation and commissioning complexity and adapting to the expansion needs of water purification systems of different scales. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the variable frequency segmented adjustment system of the CCRO water purifier of this utility model.

[0019] Figure 2 This is a schematic diagram of the inverter module connection of this utility model.

[0020] Figure 3 This is a schematic diagram of the connection of the main controller of this utility model.

[0021] Figure 4 This is a schematic diagram of the connection of the digital input / output module of this utility model.

[0022] Figure 5 This is a schematic diagram showing the connection between the analog input module and the analog output module of this utility model. Detailed Implementation

[0023] In order to make the objectives, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the specific embodiments. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0024] Reference Figure 1 , a variable frequency control system for a CCRO water purifier, including a main controller, a digital input / output module, an analog input module, an analog output module, a frequency converter module, an intermediate relay module, a solenoid valve module, and a sensor module; the input end of the main controller is connected to the signal output end of the digital input / output module, and the output end of the main controller is connected to the solenoid valve module through the intermediate relay module; a button is connected to the signal input end of the digital input / output module; the signal input end of the analog input module is connected to the sensor module; the sensor module is connected to the water pump of the water purifier; the signal output end of the analog output module is connected to the frequency converter module; the frequency converter module is connected to the water pump motor of the water purifier;

[0025] Exemplarily, according to the pressure tolerance range of the RO membrane and the requirements of the system of the present utility model, the pressure before the RO circulation pump is divided into:

[0026] Low pressure range, P < P1, the sensor module collects the pressure, connects to the main controller through the analog input module, and the frequency converter module sets the frequency to the maximum value F3 by controlling the rotation speed of the RO circulation pump motor;

[0027] Medium pressure range, P1 ≤ P < P2, the sensor module collects the pressure, connects to the main controller through the analog input module, and the frequency converter module adjusts the frequency to F2 by controlling the rotation speed of the RO circulation pump motor;

[0028] High pressure range, P ≥ P2, the sensor module collects the pressure, connects to the main controller through the analog input module, and the frequency converter module increases the frequency to F3 by controlling the rotation speed of the RO circulation pump motor;

[0029] Wherein, P1 is the first preset value, P2 is the second preset value, F2 is the adjusted frequency in the medium pressure range, F3 is the maximum frequency, and F2 < F3;

[0030] The main controller is built-in with a PID algorithm, determines the pressure range according to the pressure value collected in real time by the sensor module, dynamically adjusts the output frequency of the frequency converter module, and realizes smooth transition through the ramp time of the frequency converter;

[0031] For example, the digital input / output module receives information from the water purifier's buttons, and the main controller connects to the solenoid valve module via an intermediate relay to control the water purifier's valves;

[0032] It should be noted that this system, through the collaboration of a PLC main controller and multiple modules, forms a closed loop with real-time data feedback from sensors. The connection method of this system can accurately maintain the stability of system pressure and flow. The main controller is connected to the frequency converter, which adjusts the speed of the water pump motor in segments according to the pressure range, which can reduce energy consumption and reduce equipment wear. The main controller is connected to the solenoid valve module through the relay module, which can achieve precise control of each valve while controlling the frequency converter, preventing the water purifier from being overloaded.

[0033] In this embodiment, reference Figure 2 The frequency converter module includes a first frequency converter, a second frequency converter, a third frequency converter, and a fourth frequency converter. The first frequency converter is connected to a first RO raw water pump 1 motor, the second frequency converter is connected to a second RO raw water pump 2 motor, the third frequency converter is connected to an RO high-pressure pump 1 motor, and the fourth frequency converter is connected to an RO circulation pump 1 motor. It also includes a circuit breaker module, including a first circuit breaker QF1, a second circuit breaker QF2, a third circuit breaker QF4, and a fourth circuit breaker QF6. The first circuit breaker QF1 is connected to the first RO raw water pump 1 motor, the second circuit breaker QF2 is connected to the second RO raw water pump 2 motor, the third circuit breaker QF4 is connected to the RO high-pressure pump 1 motor, and the fourth circuit breaker QF6 is connected to the RO circulation pump 1 motor.

[0034] It should be noted that by independently controlling each water pump motor through multiple frequency converters, the speed can be precisely adjusted according to the water purification needs, thereby achieving energy saving and consumption reduction; the matching circuit breaker module provides overload and short circuit protection, ensuring the safe operation of the motor, extending the equipment life, and reducing maintenance costs;

[0035] In this embodiment, reference Figure 3The solenoid valve module includes an inlet solenoid valve 1, a concentrate solenoid valve 1, a first counter-flushing solenoid valve 1#1-1, a second counter-flushing solenoid valve 1#1-2, a third counter-flushing solenoid valve 1#2-1, and a fourth counter-flushing solenoid valve 1#2-2; the intermediate relay module includes a first intermediate relay KA1, a second intermediate relay KA4, a third intermediate relay KA6, a fourth intermediate relay KA8, a fifth intermediate relay KA9, a sixth intermediate relay KA10, a seventh intermediate relay KA11, an eighth intermediate relay KA12, and a ninth intermediate relay KA13. The first intermediate relay KA1 is connected to a first RO raw water pump 1, and the second intermediate relay KA2 is connected to an R... The high-pressure pump 1 is connected to the RO circulation pump 1 via the third intermediate relay KA6; the fourth intermediate relay KA8 is connected to the inlet solenoid valve 1; the fifth intermediate relay KA9 is connected to the concentrate solenoid valve 1; the sixth intermediate relay KA10 is connected to the first counter-flushing solenoid valve 1#1-1; the seventh intermediate relay KA11 is connected to the second counter-flushing solenoid valve 1#1-2; the eighth intermediate relay KA12 is connected to the third counter-flushing solenoid valve 1#2-1; and the ninth intermediate relay KA13 is connected to the fourth counter-flushing solenoid valve 1#2-2. The solenoid valve module is connected to the main controller via the intermediate relay module, enabling the main controller to control the solenoid valves.

[0036] It should be noted that the main controller control signal is amplified by the intermediate relay to ensure the stable operation of the solenoid valve. At the same time, the main controller is electrically isolated from the high-voltage circuit to reduce impact interference and extend the equipment life.

[0037] Optionally, refer to Figure 1 and Figure 4 It also includes an alarm unit, which is a buzzer. The buzzer is connected to the digital input / output module through a relay KA32. If the pressure continues to exceed the limit, P>P3, where P3 is the maximum pressure that the RO membrane can withstand, the main controller triggers the shutdown protection and alarms through the buzzer to prevent equipment damage.

[0038] It should be noted that when the system detects abnormal parameters, such as excessive pressure or sudden changes in flow, the main controller quickly triggers the relay KA32 through the digital input / output module. The buzzer emits an audible and visual alarm within 1 second, detecting potential problems several minutes earlier than manual inspection, thus preventing equipment damage or water quality exceeding standards. The relay isolation prevents high-voltage backflow into the controller and its expansion modules, protecting the control unit. The high-decibel buzzer effectively transmits alarms in noisy computer room environments, ensuring timely execution of emergency shutdown and other protective measures, reducing cascading losses caused by sudden failures.

[0039] Optionally, it also includes a display touchscreen, which is connected to the main controller via a data cable;

[0040] It should be noted that the touchscreen displays key system parameters dynamically through a graphical interface, such as RO membrane inlet pressure, pump speed, and product water flow rate, allowing operators to intuitively grasp the operating status. Control parameters can be modified and operating modes switched directly on the touchscreen, eliminating the need for PLC programming or physical buttons, thus reducing operational complexity. In case of an alarm, the touchscreen simultaneously displays the fault code and location, combined with a buzzer to achieve dual early warning, improving fault location efficiency and facilitating timely detection of faults by staff, thereby enhancing the efficiency of the water purifier's frequency conversion control.

[0041] In this embodiment, a switching power supply is also included, which outputs 24V DC power to power the main controller and the display touch screen;

[0042] Optionally, refer to Figure 3 The main controller is a Siemens S7-200SMART series 6ES7288-1SR60 programmable controller;

[0043] Optionally, refer to Figure 4 and Figure 5 The digital input / output module uses a 6ES7 288-2DR32 expansion module; the analog input module uses three 6ES7 288-3AE08 expansion modules; and the analog output module uses two 6ES7 288-3AQ04 expansion modules.

[0044] It should be noted that the main controller integrates 32 I / O outputs and has a built-in Ethernet port supporting Modbus TCP communication, enabling multi-pump and multi-valve coordinated control with a single CPU. Equipped with 3 analog input modules and 2 analog output modules, it can simultaneously process 24 sensor signals and 8 frequency converter control signals, meeting the precise control requirements of complex water purification systems. The 6ES7 288-2DR32 digital module provides 16DI / 16DO relay outputs, which can directly drive intermediate relays to control solenoid valves, reducing external conversion circuits and lowering the system failure rate. It is compatible with the Siemens TIA Portal programming environment, supporting LAD / FBD / STL multi-language programming. The S7-200SMART series is highly versatile, reducing maintenance costs.

[0045] The CCRO water purifier frequency conversion control system of this utility model can be implemented in hardware, software, firmware, or any combination thereof. The various features described are modules, units, or components that can be implemented together in an integrated logic device or separately as discrete but interoperable logic devices or other hardware devices. In some cases, the various features of the electronic circuitry can be implemented as one or more integrated circuit devices, such as integrated circuit chips or chipsets.

[0046] The main controller, digital input / output module, analog input module, analog output module, frequency converter module, intermediate relay module, solenoid valve module, sensor module, circuit breaker module, alarm unit, and display touch screen involved in this utility model can all adopt commonly used circuit forms and models in the field. This utility model does not limit the specific model. Based on the knowledge of those skilled in the art, the corresponding circuit forms and specific models can be expected to realize the functions of this utility model.

[0047] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A CCRO water purifier frequency conversion control system, characterized in that, include: The system comprises a main controller, a digital input / output module, an analog input module, an analog output module, a frequency converter module, an intermediate relay module, a solenoid valve module, and a sensor module. The input terminal of the main controller is connected to the signal output terminal of the digital input / output module, and the output terminal of the main controller is connected to the solenoid valve module via the intermediate relay module. A button is connected to the signal input terminal of the digital input / output module. The signal input terminal of the analog input module is connected to the sensor module. The sensor module is connected to a water purifier pump. The signal output terminal of the analog output module is connected to the frequency converter module. The frequency converter module is connected to the water purifier pump motor.

2. The CCRO water purifier frequency conversion control system according to claim 1, characterized in that, The frequency converter module includes a first frequency converter, a second frequency converter, a third frequency converter, and a fourth frequency converter. The first frequency converter is connected to a first RO raw water pump motor, the second frequency converter is connected to a second RO raw water pump motor, the third frequency converter is connected to an RO high-pressure pump motor, and the fourth frequency converter is connected to an RO circulation pump motor.

3. The CCRO water purifier frequency conversion control system according to claim 1, characterized in that, The solenoid valve module includes an inlet solenoid valve, a concentrate solenoid valve, a first counter-flushing solenoid valve, a second counter-flushing solenoid valve, a third counter-flushing solenoid valve, and a fourth counter-flushing solenoid valve.

4. The CCRO water purifier frequency conversion control system according to claim 3, characterized in that, The intermediate relay module includes a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay, a fifth intermediate relay, a sixth intermediate relay, a seventh intermediate relay, an eighth intermediate relay, and a ninth intermediate relay. The first intermediate relay is connected to a first RO raw water pump, the second intermediate relay is connected to an RO high-pressure pump, the third intermediate relay is connected to an RO circulation pump, the fourth intermediate relay is connected to the inlet solenoid valve, the fifth intermediate relay is connected to the concentrate solenoid valve, the sixth intermediate relay is connected to the first counter-flushing solenoid valve, the seventh intermediate relay is connected to the second counter-flushing solenoid valve, the eighth intermediate relay is connected to the third counter-flushing solenoid valve, and the ninth intermediate relay is connected to the fourth counter-flushing solenoid valve.

5. The CCRO water purifier frequency conversion control system according to claim 2, characterized in that, It also includes a circuit breaker module, comprising a first circuit breaker, a second circuit breaker, a third circuit breaker, and a fourth circuit breaker. The first circuit breaker is connected to the first RO raw water pump motor, the second circuit breaker is connected to the second RO raw water pump motor, the third circuit breaker is connected to the RO high-pressure pump motor, and the fourth circuit breaker is connected to the RO circulating pump motor.

6. The CCRO water purifier frequency conversion control system according to claim 1, characterized in that, It also includes an alarm unit, which includes a buzzer connected to the digital input / output module via a relay.

7. The CCRO water purifier frequency conversion control system according to claim 1, characterized in that, It also includes a display touchscreen, which is connected to the main controller via a data cable.

8. The CCRO water purifier frequency conversion control system according to claim 7, characterized in that, It also includes a switching power supply, which outputs 24V DC power to power the main controller and the display touch screen.

9. The CCRO water purifier frequency conversion control system according to claim 1, characterized in that, The main controller is a Siemens S7-200SMART series 6ES7 288-1SR60 programmable controller.

10. The CCRO water purifier frequency conversion control system according to claim 1, characterized in that, The digital input / output module uses a 6ES7 288-2DR32 expansion module; the analog input module uses three 6ES7 288-3AE08 expansion modules; and the analog output module uses two 6ES7 288-3AQ04 expansion modules.

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