Intelligent water pump with dual protection function

Abstract

The utility model provides an intelligent water pump with double protection functions, which relates to the technical field of water supply and comprises a pump body, a motor and a controller component from bottom to top, the upper end of the pump body is connected with a flange at the lower end of the motor, a shell is sleeved outside the motor and the controller component and is divided into an upper cavity and a lower cavity, the motor is accommodated in the lower cavity, and the upper cavity is a sealed cavity. The controller assembly is integrated in the pump body and comprises a speed regulation device, a regulation and control module and an HMI man-machine module, the speed regulation device, the regulation and control module and the HMI man-machine module are electrically connected with one another, a pressure sensor is arranged at the tail end of the pump body, and the regulation and control module is provided with an external tail end pressure sensor interface connected with the pressure sensor. The tail end pressure is collected in real time and compared with a target value, the rotating speed of the water pump is adjusted in real time through the speed adjusting device, the tail end pressure is constant, and a storage chip is arranged in the adjusting and controlling module and used for storing feedback pressure, current, power, time, rotating speed and flow data of a tail end pressure sensor.

Description

Technical Field

[0001] The utility model relates to water supply technology, in particular to an intelligent water pump with dual protection functions, belonging to the field of water supply. Background Art

[0002] In order to improve the quality of life of the vast majority of residents in our country, the secondary water supply system is an important part of the water supply system of the water company. It is mainly composed of water pumps, control cabinets, sensors, etc. The system is complex and requires professional personnel to operate. The stability of the system is highly dependent on sensors. Once the sensor fails or fails, the entire system is out of control, resulting in serious consequences. If multiple sensor solutions are used, the system cost will be greatly increased. In view of the above situation, an intelligent water pump with dual protection functions is proposed: the integrated pump body, motor, speed control device, control module, HMI human-machine module, etc. are integrated into one, and it has a dual out-of-control protection function combining sensorless and sensory. The utility model has the advantages of high integration, stable terminal pressure, safety and reliability, and high intelligence. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides an intelligent water pump with dual protection functions, which solves the problems raised in the above background technology.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: an intelligent water pump with dual protection functions: from bottom to top, it includes a pump body, a motor, and a controller assembly, the upper end of the pump body is connected to the flange plate at the lower end of the motor, the motor and controller assembly are covered with a shell, the shell is divided into upper and lower cavities, the motor is accommodated in the lower cavity, the upper cavity is a sealed cavity, the controller assembly is integrated inside, including a speed control device, a control module, and an HMI human-machine module, which are electrically connected to each other, a pressure sensor is arranged at the end of the pump body, and the control module is provided with an external terminal pressure sensor interface connected to the pressure sensor, and the terminal pressure is collected in real time through the external terminal pressure sensor and compared with the target value, and the speed control device is used to adjust the water pump speed in real time to achieve constant terminal pressure, and a storage chip is provided in the control module for storing pressure, current, power, time, speed, and flow data fed back by the terminal pressure sensor.

[0007] Preferably, the rear end cover of the motor is provided with an impeller, a heat dissipation channel is formed between the motor and the lower cavity, and the impeller is driven by the motor shaft to provide cooling air volume for the system.

[0008] Preferably, the control module is provided with a communication module, and the communication module has multiple communication functions such as 4G, Bluetooth, 485, and CAN, so as to realize data exchange and control between the control module and the speed regulation module, HMI human-machine module, sensor, and multiple control modules.

[0009] Preferably, the HMI human-machine module is provided with touch buttons and a display screen to realize human-machine interaction.

[0010] Preferably, the control module may, through a self-learning function, autonomously write the water pump pressure, flow, current, power, speed, and voltage on a dedicated test bench, and draw a one-to-one correspondence into a chart;

[0011] The control module obtains the corresponding pressure and flow rate by looking up the table according to the real-time current, power, speed and voltage. This is a sensorless algorithm that realizes sensorless constant terminal pressure.

[0012] Preferably, the controller component compares the terminal pressure and flow calculated by the sensorless algorithm with the pressure and flow of the terminal sensor, combined with historical data, and determines whether the current system is operating normally by comparing with the target value, thereby avoiding system loss of control due to sensor failure and providing double protection for the system.

[0013] A water pump unit is composed of multiple intelligent water pumps with dual protection functions connected in series or in parallel. The water pump unit realizes data interaction between multiple water pumps through CAN communication provided in the control module, and sets the first water pump as the main control center in the connection sequence, and the other water pumps are slave pumps to realize unified control by one center. When the first main control fails, the second water pump automatically switches to the main control center.

[0014] (III) Beneficial effects

[0015] The utility model provides an intelligent water pump with dual protection functions. It has the following beneficial effects:

[0016] The intelligent water pump with dual protection function integrates the pump body, motor, speed regulation device, control module, HMI human-machine module, etc., and can automatically stabilize the terminal pressure when a single or multiple water pumps are combined; it has a dual out-of-control protection function combining sensorless and sensor. The utility model has the advantages of high integration, stable terminal pressure, safety and reliability, high intelligence, and low system cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is composed of an intelligent water pump with dual protection functions;

[0018] Figure 2 This is a schematic diagram of the sensorless control of the utility model;

[0019] Figure 3 This is the sensorless control flow chart of the utility model;

[0020] Figure 4 This is a schematic diagram of the dual out-of-control protection function of the utility model that combines sensorless and sensory functions;

[0021] Figure 5 It is a one-year power trend partition diagram of the utility model;

[0022] Figure 6 Calculate historical average data for each day within the utility model interval.

[0023] In the figure: 1. Pump body; 2. Motor; 3. Impeller; 4. Radiator; 5. Speed ​​regulating device; 6. Control module; 7. HMI human-machine module; 8. Casing. DETAILED DESCRIPTION

[0024] The utility model provides an intelligent water pump with dual protection functions, such as Figure 1-6 As shown, from bottom to top, it includes a pump body 1, a motor 2, and a controller component. The overall structure is dustproof and waterproof. The upper end of the pump body 1 is connected to the flange plate at the lower end of the motor 2. The motor 2 and the controller component are covered with a shell 8. The shell 8 is divided into an upper and lower cavity. The motor 2 is accommodated in the lower cavity. The upper cavity is a sealed cavity. The controller component is integrated inside, including a speed regulating device 5, a control module 6, and an HMI human-machine module 7, which are electrically connected to each other. A pressure sensor is set at the end of the pump body 1. The control module 6 is provided with an external terminal pressure sensor interface connected to the pressure sensor. The terminal pressure is collected in real time through the external terminal pressure sensor and compared with the target value. The speed regulating device 5 is used to adjust the water pump speed in real time to achieve constant terminal pressure. The control module 6 is provided with a storage chip for storing pressure, current, power, time, speed, and flow data fed back by the terminal pressure sensor.

[0025] As a preferred implementation scheme, an impeller 3 is provided at the rear end cover of the motor 2, a heat dissipation channel is formed between the motor 2 and the lower cavity, and the impeller 3 is driven by the shaft of the motor 2 to provide cooling air volume for the system, thereby improving the heat dissipation effect.

[0026] In the implementation scheme of this case, the control module 6 is provided with a communication module, which has multiple communication functions such as 4G, Bluetooth, 485, CAN, etc., to realize data communication and control between the control module 6 and the speed control module, HMI human-machine module 7, sensors, and multiple control modules. Through 485 and the speed control module, data interconnection is realized, and the speed command is sent to the speed control module, and the speed control module controls the operation of the motor 2 according to the specified speed. In addition to 485 communication, the control module 6 and the speed control module are also connected by IO dry contacts. When the communication is lost, the speed control module is controlled by high and low levels to ensure system stability.

[0027] An improvement is provided, which is a water pump unit consisting of a plurality of intelligent water pumps with dual protection functions connected in series or in parallel. The water pump unit realizes data interaction between a plurality of water pumps through the CAN communication provided in the control module 6, and sets the first water pump as the main control center according to the connection sequence, and the other water pumps as slave pumps, so as to realize unified control by one center. When the first main control fails, the second water pump automatically switches to the main control center.

[0028] In the present embodiment, the HMI human-machine module 7 is provided with touch buttons and a display screen to realize human-machine interaction.

[0029] The sensorless pressure algorithm first calculates the relationship between flow and pump speed under different pressures through experimental means, and calculates other curves of various flow and pressure through several sets of special flow, pressure and speed curves (as shown below), and stores these data in the storage chip for use in control. The principle is through the conservation of mechanical energy of the fluid, that is, kinetic energy + gravitational potential energy + pressure potential energy = constant relationship;

[0030]

[0031] The self-learning function of the intelligent water pump control module 6 refers to measuring the current, power, speed, and voltage of the water pump at different speeds, pressures, and flow rates through a dedicated test bench, and drawing a one-to-one correspondence into a graph.

[0032]

[0033] Note: The chart only shows part of the data.

[0034] As shown in the table, the principle of the intelligent water pump sensorless constant pressure algorithm is to look up the corresponding pressure and flow rate according to the real-time current, power, speed, and voltage of the water pump to achieve sensorless constant terminal pressure. Figure 2 As shown:

[0035] Preferably, the controller component compares the terminal pressure and flow calculated by the sensorless algorithm with the pressure and flow of the terminal sensor, combined with historical data, and determines whether the current system is operating normally by comparing with the target value, thereby avoiding system loss of control due to sensor failure and providing double protection for the system.

[0036] Combination Figure 4 Figure 5 , Figure 6 Further explanation of the implementation method. The terminal pressure sensor feeds back the pressure signal to the control center of the control module 6 through the 4-20mA analog interface of the control module 6 to obtain real-time terminal pressure data. The control module 6 is equipped with a clock function and can perform time correction with the cloud to ensure time accuracy; the control module 6 is equipped with a storage chip, which stores operation data every 3-10 minutes. The stored data includes: sensor feedback pressure, current, power, time, speed, and can store 1 year of operation data (such as Figure 5 As shown, the vertical axis unit is pa), and the historical data of each day is summarized; in order to reduce the calculation cycle and data volume, according to the total power trend chart, the continuous data with a total power difference within a certain range is divided into an interval, and a year is divided into multiple intervals AZ; and the pressure, current, power, and speed of each interval are summarized and averaged to generate a range chart of pressure, current, power, and speed in the interval for one day, as shown in Figure 6 When the system is running, at 0:00 every day, the range chart of the day is selected according to the date as the basis for fault judgment.

[0037] like Figure 4 As shown, the terminal pressure data obtained by the sensorless algorithm is compared with the pressure value fed back by the terminal pressure sensor. If the error between the two values ​​is within 5%, it is determined to be normal and the system is working normally. If the error between the two values ​​is between 5% and 10%, a warning signal is issued, but the system does not stop to maintain the current state of operation; if the error between the two values ​​exceeds 10%, the historical data is compared at this time. If the pressure data fed back by the pressure sensor is within the historical data range and the sensorless pressure exceeds the historical data, the sensor pressure signal is used to maintain the system operation, and the sensorless algorithm coefficient is adjusted to correct the sensorless pressure value; otherwise, the sensor pressure signal is used to maintain the system operation, and the system issues a fault alarm; when the pressure sensor pressure, the sensorless algorithm pressure, and the historical data all differ by more than 10%-30%, the system is maintained by all three systems to ensure basic water supply; once the pressure sensor pressure, the sensorless algorithm pressure, and the historical data all differ by more than 30%, the system is shut down for protection. This solution provides a dual fault protection for the water supply system, solves the problem of system sensor fault detection, and at the same time ensures the ability of the water pump to supply water when the sensor fails.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent water pump with dual protection functions, characterized in that: From bottom to top, it comprises a pump body (1), a motor (2), and a controller component. The upper end of the pump body (1) is connected to the flange plate of the lower end of the motor (2). The motor (2) and the controller component are provided with a shell (8) outside. The shell (8) is divided into an upper and lower cavity. The motor (2) is accommodated in the lower cavity. The upper cavity is a sealed cavity. The controller component is integrated inside and comprises a speed regulating device (5), a control module (6), and an HMI human-machine module (7). The control module (6) is electrically connected to each other. A pressure sensor is arranged at the end of the pump body (1). The control module (6) is provided with an external terminal pressure sensor interface connected to the pressure sensor. The terminal pressure is collected in real time through the external terminal pressure sensor and compared with the target value. The speed regulating device (5) is used to adjust the speed of the water pump in real time to achieve constant terminal pressure. The control module (6) is provided with a storage chip for storing the pressure, current, power, time, speed, and flow data fed back by the terminal pressure sensor.

2. The intelligent water pump with dual protection function according to claim 1 is characterized in that: The rear end cover of the motor (2) is provided with an impeller (3), a heat dissipation channel is formed between the motor and the lower cavity, and the impeller (3) is driven by the motor shaft to provide the system with the required air volume for cooling.

3. The intelligent water pump with dual protection function according to claim 1 is characterized in that: The control module (6) is provided with a communication module, and the communication module has multiple communication functions such as 4G, Bluetooth, 485, and CAN, so as to realize data communication and control between the control module (6) and the speed regulating device (5), the HMI human-machine module (7), the sensor, and the multiple control modules (6).

4. The intelligent water pump with dual protection function according to claim 1 is characterized in that: The HMI human-machine module (7) is provided with touch buttons and a display screen to realize human-machine interaction.

5. The intelligent water pump with dual protection function according to claim 1 is characterized in that: The control module (6) may, through a self-learning function, autonomously write the water pump pressure, flow, current, power, speed, and voltage on a dedicated test bench, and draw a one-to-one correspondence in a graph; The control module (6) obtains the corresponding pressure and flow rate by looking up the table according to the real-time current, power, rotation speed and voltage. This is a sensorless algorithm that realizes sensorless constant terminal pressure.

6. The intelligent water pump with dual protection function according to claim 5 is characterized in that: The controller component compares the terminal pressure and flow calculated by the sensorless algorithm with the pressure and flow of the terminal sensor, combined with historical data, and determines whether the current system operation is normal by comparing with the target value, avoiding system loss of control due to sensor failure, and providing double protection for the system.

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