Marine pump switching automatic control system and implementation method thereof

Abstract

The invention discloses a marine pump switching automatic control system and an implementation method thereof.The system comprises at most 16 master and slave pump switching controller units, a master pump is an M-type pump, slave pumps are S-type pumps, each unit comprises one M-type pump switching controller and at most three S-type pump switching controllers, the interiors of all the units are connected through CAN interfaces, and the CAN interfaces are connected with the master and slave pump switching controller units. The units are connected through 485 interfaces, the external resistor is 120 ohms, and the implementation method comprises the steps that the M-type pump switching controller is used for controlling the units, the S-type pump switching controllers are used for directly controlling the pumps, each S-type pump switching controller can control one pump, and one system can control at most 48 pumps. And a plurality of pump switching controller units are effectively integrated into the same system. By optimizing the working sequence and load of the pumps, all the pumps run in the optimal working state, the use efficiency is improved, energy utilization is maximized, and the service life of equipment is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a marine pump switching automatic control system and an implementation method thereof. Background Art

[0002] In modern ship engineering, pumps are important equipment for liquid transportation and management, and are widely used in fuel systems, cooling systems, fresh water supply, sewage treatment and other aspects. In order to meet the needs of high-power and high-efficiency operations, some large ships have begun to use multiple pump combinations to achieve load balancing and redundancy, but multi-pump control still relies on manual or simple timing control methods for start, stop and switch. This simple static mode is difficult to cope with strict dynamic requirements. Under high load or fault conditions, it may cause excessive wear or failure of the pump, which in turn affects the efficiency and safety of the entire system, especially in complex and harsh marine environments. There are great limitations, such as slow response speed and operator error. Therefore, in order to improve the efficiency and safety of ship operations, it is particularly important to establish a reliable pump switching automatic control system. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a marine pump switching automatic control system and its implementation method.

[0004] Technical solution: The marine pump switching automatic control system described in the present invention includes at most 16 master and slave pump switching controller units, the master pump is an M-type pump, and the slave pump is an S-type pump. Each unit includes 1 M-type pump switching controller and at most 3 S-type pump switching controllers. Each unit is connected internally through a CAN interface, and the units are connected through a 485 interface. The external resistor is 120Ω.

[0005] Furthermore, the M-type pump switching controller includes a power board and a control board, the power board includes a power supply unit, a dial unit, a DO output unit and an AI input unit, the control board includes a power conversion unit, a CPU unit, a communication unit, a USB drive unit and a DI input unit, the power supply unit and the power conversion unit provide power for the entire system, and the dial unit, DO output unit, AI input unit, communication unit, USB drive unit and DI input unit are directly connected to the CPU unit.

[0006] Furthermore, the power supply unit is composed of an isolated power supply module, which converts the input voltage into a stable 5V DC output to power the AI ​​input unit and the communication unit.

[0007] Furthermore, the dial unit includes a four-digit rotary dial and a sixteen-digit rotary dial, the four-digit rotary dial is a STANDBY POSITION dial, and the sixteen-digit rotary dial is a 485ID SET dial.

[0008] Furthermore, the DO output unit sends digital signals to control external devices or circuits, and includes five groups of relays, namely DO1, DO2, DO3, DO4 and DO5, with a contact capacity of 2A@30VDC / 250VAC.

[0009] Furthermore, the AI ​​input unit includes an isolation amplifier and an operational amplifier. After receiving the analog signal sent by the sensor, the analog signal is transmitted to the isolation amplifier, and electrical isolation is provided by the isolation amplifier. The signal output by the isolation amplifier is then sent to the operational amplifier for amplification and finally sent to the CPU unit.

[0010] Furthermore, the power conversion unit includes an isolated power module and an LDO power converter. The isolated power module converts the input voltage into a stable 24V DC output to power the DO output unit and the DI input unit. The LDO power converter converts the 5V DC provided by the power unit into a 3.3V DC output voltage to power the dial unit, the DO output unit, the AI ​​input unit, the CPU unit, the CAN communication unit in the communication unit, the USB drive unit and the DI input unit.

[0011] Furthermore, the communication unit includes a CAN communication unit and a 485 communication unit, and the CAN and 485 communication units are used for internal and external communications of the controller unit, respectively.

[0012] Furthermore, the DI input unit receives a digital signal from an external device to determine an input state, and includes six groups of optocoupler circuits, namely DI1, DI2, DI3, DI4, DI5 and DI6.

[0013] The method for realizing automatic control of switching of a marine pump according to the present invention comprises:

[0014] Each system consists of up to 16 controller units, each unit includes 1 M-type pump switching controller and up to 3 S-type pump switching controllers. The M-type pump switching controller is used for control between units, and the S-type pump switching controller is used to directly control the pump. Each S-type pump switching controller can control one pump. A system can control up to 48 pumps. Each unit is connected internally through a CAN interface, and units are connected through a 485 interface. This can effectively integrate multiple pump switching controller units into the same system.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention optimizes the working order and load of the pumps so that each pump can operate in the best working state, improves the utilization efficiency, maximizes the energy utilization, and effectively extends the life of the equipment; with the help of real-time monitoring and status evaluation, potential problems can be discovered in advance and switched to the backup pump in time, thereby improving the reliability of the system and reducing the risk of failure due to human error; in an emergency, automatic switching can respond quickly, reduce the probability of accidents, ensure the safety of personnel and the environment, and avoid economic losses caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Network topology diagram for marine pump switching automatic control system;

[0017] Figure 2 It is the overall circuit structure diagram of the M-type pump switching controller;

[0018] Figure 3 This is the circuit diagram of the power board of the M-type pump switching controller;

[0019] Figure 4 This is a schematic diagram of the control board circuit of the M-type pump switching controller;

[0020] Figure 5 A three-dimensional diagram of the M-type pump switching controller;

[0021] Figure 6 Dimensional drawing of the M-type pump switching controller;

[0022] Figure 7 This is the wiring diagram of the M-type pump switching controller;

[0023] Figure 8 This is the wiring diagram for the S-type pump switching controller. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown in the figure, a marine pump switching automatic control system has a network topology diagram as shown in the figure. Figure 2 As shown, it consists of up to 16 master (M type) and slave (S type) pump switching controller units, each unit includes 1 M type pump switching controller and up to 3 S type pump switching controllers. Each unit is connected internally through a CAN interface, and the units are connected through a 485 interface, and the external resistor is 120Ω.

[0026] The overall circuit structure of the M-type pump switching controller is shown in the figure below: Figure 1As shown, it includes a power board and a control board. The power board includes a power unit 1, a dial unit 2, a DO output unit 3 and an AI input unit 4, and the control board includes a power conversion unit 5, a CPU unit 6, a communication unit 7, a USB drive unit 8 and a DI input unit 9. The power unit 1 and the power conversion unit 5 provide power for the entire system, and the dial unit 2, the DO output unit 3, the AI ​​input unit 4, the communication unit 7, the USB drive unit 8 and the DI input unit 9 are directly connected to the CPU unit 6.

[0027] The schematic diagram of the power board circuit structure of the M-type pump switching controller is as follows: Figure 3 As shown, the power supply unit 1 is used to provide 5V voltage and is composed of an isolated power supply module. The isolated power supply module converts the input voltage into a stable 5VDC output to power the AI ​​input unit 4 and the communication unit 7.

[0028] The dial unit 2 provides the operation interface between the user and the device, and consists of a four-digit rotary dial and a sixteen-digit rotary dial. The four-digit rotary dial is the STANDBY POSITION dial, which is used to set the pump number. Dials 0-4 correspond to pumps numbered 0-4, and a total of three pumps can be numbered. The sixteen-digit rotary dial is the 485ID SET dial, which is used to set the controller unit number. Dials 0-F correspond to units numbered 1-16, and a total of 16 units can be connected.

[0029] DO output unit 3 is used to send digital signals to control external devices or circuits. It consists of five groups of relays, namely DO1, DO2, DO3, DO4 and DO5, with a contact capacity of 2A@30VDC / 250VAC. Among them, DO1 is used to output the standby pump indication signal, DO2 is used to output the start command signal, DO3 is used to output the fault signal, DO4 is used to output the conversion completion signal, and DO5 is used to output the standby output point signal. When the relay is working, the corresponding LED light will light up, which is convenient for judging the working status of the pump at this time.

[0030] The AI ​​input unit 4 is used to receive analog signals and convert them into digital signals, and is composed of an isolation amplifier and an operational amplifier. After receiving the analog signal sent by the sensor, it is transmitted to the isolation amplifier, which provides electrical isolation. This not only protects downstream electronic equipment, but also maintains signal integrity and prevents interference sources from affecting signal quality. The signal output by the isolation amplifier is then sent to the operational amplifier for amplification and finally sent to the CPU unit 6.

[0031] The schematic diagram of the control board circuit structure of the M-type pump switching controller is as follows Figure 4As shown, the power conversion unit 5 is used to provide 24V and 3.3V voltages, and is composed of an isolated power module and an LDO power converter, wherein the input voltage is converted into a stable 24V DC output through the isolated power module to power the DO output unit 3 and the DI input unit 9. The 5V DC provided by the power supply unit 1 is converted into a 3.3V DC output voltage through the LDO power converter to power the dial unit 2, the DO output unit 3 and the AI ​​input unit 4, the CPU unit 6, the CAN communication unit in the communication unit 7, the USB drive unit 8 and the DI input unit 9.

[0032] The CPU unit 6 is the core control part of the device, responsible for executing various logical operations, data processing and instruction control. The CPU unit 6 consists of a CPU minimum system circuit and an anti-static protector, wherein the CPU uses an STM32F103C8T6 chip.

[0033] The communication unit 7 is composed of a CAN communication unit and a 485 communication unit. The CAN (Controller Area Network) and 485 (usually referring to the RS-485 communication standard) communication units are used for internal and external communications of the controller unit, respectively. The CAN bus supports multiple nodes (devices) to communicate on the same network, which is suitable for complex distributed systems. RS-485 can support a longer transmission distance, which is suitable for communication between remote devices. The CAN communication unit and the 485 communication unit work together to realize the communication of the entire system.

[0034] The USB drive unit 8 is used to realize data transmission between the device and an external computer or other devices, and is composed of a USB drive and a drive protection circuit.

[0035] The DI input unit 9 is used to receive digital signals from external devices to determine the input status. It is composed of six groups of optical coupling circuits, namely DI1, DI2, DI3, DI4, DI5 and DI6. Among them, DI1 is used to input automatic signals, DI2 is used to input stop signals, DI3 is used to input operation feedback signals, DI4 is used to input pressure abnormality signals, DI5 is used to input power status signals, and DI6 is used to input external fault signals. When the optical coupling is working, the corresponding LED light will light up, which is convenient for judging the working status of the pump at this time.

[0036] 3D and dimensional drawings of the M-type pump switching controller, such as Figure 5 and Figure 6 As shown, the length of this M-type pump switching controller is 99mm, the width is 45.2mm, and the height is 113.65mm. The size and appearance of the S-type pump switching control are consistent with those of the M-type pump switching control.

[0037] The circuit diagram of the M-type pump switching controller is as follows: Figure 7 As shown in the table below, there are 32 interfaces.

[0038] The interface functions are shown in the following table.

[0039]

[0040] The circuit diagram of the S-type pump switching controller is as follows: Figure 8 As shown in the figure, it can be seen that its function is basically the same as that of the M-type pump switching controller, the difference is that the S-type pump switching controller does not have the 485 communication function.

[0041] The marine pump switching automatic control system designed by the present invention is installed on the guide rail, the terminals are pluggable, the wiring is convenient, safe and reliable. It has the characteristics of small size, light weight, high reliability, long service life, simple operation, etc., which can effectively improve system efficiency, optimize resource allocation, improve system reliability, reduce failure risks, enhance safety assurance, and reduce operating costs.

Claims

1. A marine pump switching automatic control system, characterized in that: It includes up to 16 master and slave pump switching controller units. The master pump is an M-type pump and the slave pump is an S-type pump. Each unit includes 1 M-type pump switching controller and up to 3 S-type pump switching controllers. Each unit is connected internally through a CAN interface, and the units are connected through a 485 interface. The external resistor is 120Ω.

2. The marine pump switching automatic control system according to claim 1, characterized in that: The M-type pump switching controller comprises a power board and a control board, wherein the power board comprises a power supply unit (1), a dial unit (2), a DO output unit (3) and an AI input unit (4), and the control board comprises a power conversion unit (5), a CPU unit (6), a communication unit (7), a USB drive unit (8) and a DI input unit (9). The power supply unit (1) and the power conversion unit (5) provide power for the entire system, and the dial unit (2), the DO output unit (3), the AI ​​input unit (4), the communication unit (7), the USB drive unit (8) and the DI input unit (9) are directly connected to the CPU unit (6).

3. The marine pump switching automatic control system according to claim 1, characterized in that: The power supply unit (1) is composed of an isolated power supply module, which converts the input voltage into a stable 5V DC output to supply power to the AI ​​input unit (4) and the communication unit (7).

4. The marine pump switching automatic control system according to claim 1, characterized in that: The dial unit (2) comprises a four-digit rotary dial and a sixteen-digit rotary dial, the four-digit rotary dial is a STANDBYPOSITION dial, and the sixteen-digit rotary dial is a 485ID SET dial.

5. The marine pump switching automatic control system according to claim 1, characterized in that: The DO output unit (3) sends digital signals to control external devices or circuits, and includes five groups of relays, namely DO1, DO2, DO3, DO4 and DO5, with a contact capacity of 2A@30VDC / 250VAC.

6. The marine pump switching automatic control system according to claim 1, characterized in that: The AI ​​input unit (4) comprises an isolation amplifier and an operational amplifier. After receiving an analog signal sent by a sensor, the analog signal is transmitted to the isolation amplifier, and electrical isolation is provided by the isolation amplifier. The signal output by the isolation amplifier is then sent to the operational amplifier for amplification and finally sent to the CPU unit (6).

7. The marine pump switching automatic control system according to claim 1, characterized in that: The power conversion unit (5) comprises an isolated power module and an LDO power converter. The isolated power module converts the input voltage into a stable 24VDC output to supply power to the DO output unit (3) and the DI input unit (9). The LDO power converter converts the 5V DC provided by the power supply unit (1) into a 3.3V DC output voltage to supply power to the dial unit (2), the DO output unit (3), the AI ​​input unit (4), the CPU unit (6), the CAN communication unit in the communication unit (7), the USB drive unit (8) and the DI input unit (9).

8. The marine pump switching automatic control system according to claim 1, characterized in that: The communication unit (7) comprises a CAN communication unit and a 485 communication unit, and the CAN and 485 communication units are used for internal and external communications of the controller unit respectively.

9. The marine pump switching automatic control system according to claim 1, characterized in that: The DI input unit (9) receives a digital signal from an external device to determine an input state, and comprises six groups of optical coupling circuits, namely DI1, DI2, DI3, DI4, DI5 and DI6.

10. A method for realizing automatic control of marine pump switching, characterized in that: include: Each system consists of up to 16 controller units, each unit includes 1 M-type pump switching controller and up to 3 S-type pump switching controllers. The M-type pump switching controller is used for control between units, and the S-type pump switching controller is used to directly control the pump. Each S-type pump switching controller can control one pump. A system can control up to 48 pumps. Each unit is connected internally through a CAN interface, and units are connected through a 485 interface. This can effectively integrate multiple pump switching controller units into the same system.

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