Water pump cavitation monitoring and control system

Abstract

A water pump cavitation monitoring and control system belongs to the technical field of water pump monitoring and control. The invention aims to solve the problem that the working efficiency of a water pump is affected due to the fact that water pump cavitation judgment is not timely in an existing water pump cavitation monitoring and control mode, especially a single-index water pump cavitation monitoring and control method. The sensor module is used for monitoring running state data of the water pump in real time and transmitting the running state data to the control module, and the running state data comprise pressure data, temperature data and vibration data; the control module is used for judging cavitation on the basis of the pressure data, the temperature data and the vibration data and controlling the action of the exhaust device according to a judgment result; the basis of cavitation judgment based on the pressure data, the temperature data and the vibration data is that vibration data abnormity is met, and temperature abnormity or pressure abnormity is met at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of water pump monitoring and control, and in particular relates to a water pump cavitation monitoring and control system. Background Art

[0002] Intermittently working water pumps often experience cavitation. After cavitation is formed, the water pump will heat up and vibrate violently. If not handled in time, the equipment may be damaged. Such problems are often discovered by on-site inspections by patrol personnel and then exhaust treatment is performed. This not only increases the workload of operators, but may also damage the equipment due to untimely treatment. Therefore, an intermittent water pump cavitation monitoring and control system is needed, which can monitor the operating status of the water pump in real time, exhaust air in time after cavitation is formed, and remind equipment operators to discover it in time, so as to improve the reliability of the system, reduce costs and realize intelligent management. Summary of the invention

[0003] The present invention aims to solve the problem that the existing water pump cavitation monitoring and control methods, especially the water pump cavitation monitoring and control methods with a single indicator, have untimely water pump cavitation judgment, which affects the working efficiency of the water pump.

[0004] A water pump cavitation monitoring and control system, comprising: a control module (1), a sensor module (4), and an exhaust device (5);

[0005] Sensor module (4): used for real-time monitoring of the running status data of the water pump, including pressure data, temperature data, and vibration data, and transmitting the collected data to the control module (1);

[0006] A control module (1) determines cavitation based on pressure data, temperature data, and vibration data, and controls the operation of the exhaust device (5) according to the determination result;

[0007] The basis for determining cavitation based on pressure data, temperature data, and vibration data is: vibration data anomaly, and temperature anomaly or pressure anomaly is satisfied.

[0008] Furthermore, the sensor module (4) comprises a pressure sensor, a vibration sensor, and a temperature sensor, all of which are arranged on the water pump.

[0009] Furthermore, abnormal vibration data refers to that the high-frequency component in the vibration frequency data is greater than or equal to a vibration frequency threshold.

[0010] Furthermore, the temperature abnormality means that the temperature of the pump body is 10° C. to 15° C. higher than the temperature of the pump body in normal operation.

[0011] Furthermore, abnormal pressure refers to a pressure fluctuation range of 10% to 30%.

[0012] Furthermore, the system also comprises a communication module (2), and the communication module (2) is used to realize data transmission between the control module (1) and the remote monitoring system.

[0013] Furthermore, the control module (1) is also used to receive disconnection fault data detected by the sensor module, and if disconnection fault data detected by the sensor module is received, an early warning signal is sent to a remote monitoring system through the communication module (2).

[0014] Furthermore, the system also comprises a parameter display and adjustment module (3), which is used to display the current operating status information of the water pump and can also adjust parameters and limit values ​​according to different working conditions.

[0015] Beneficial effects:

[0016] This application has functions such as fault diagnosis and early warning. By monitoring the operating parameters and using effective judgment basis for control, it can detect water pump abnormalities in time and discharge the gas, thereby effectively avoiding water pump cavitation, improving the working efficiency of the water pump, and reducing energy waste.

[0017] At the same time, the control system adopts a low-cost single-chip microcomputer combined with common sensors and communication modules. It has a simple structure, easy installation, flexible interface and can be combined with a remote monitoring system. It can effectively improve the operation reliability and management efficiency of the water pump and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the arrangement of the water pump cavitation monitoring and control system of the present invention.

[0019] Figure 2 It is a control flow chart of the water pump cavitation monitoring and control system of the present invention. DETAILED DESCRIPTION

[0020] Specific implementation method 1: Combination Figure 1 and Figure 2 To explain this embodiment,

[0021] This embodiment is a water pump cavitation monitoring and control system, which includes a control module 1, a communication module 2, a parameter display and adjustment module 3, a sensor module 4, and an exhaust device 5.

[0022] The sensor module 4 includes a pressure sensor, a vibration sensor, and a temperature sensor, all of which are arranged on the water pump 6 and are used to monitor the operating status of the water pump in real time and transmit the collected data to the control module 1 .

[0023] The control module 1 determines cavitation based on the pressure data, the temperature data, and the vibration data, and controls the operation of the exhaust device 5 according to the determination result.

[0024] In some embodiments, the control module uses a high-performance, low-power STM32F103 series single-chip microcomputer as the core controller. The controller is also equipped with data acquisition input and output ports, and the sensor module and the actuator can be connected to the corresponding ports of the single-chip microcomputer. The control logic program is written in assembly language inside the single-chip microcomputer. The program comprehensively judges whether there is a cavitation risk based on the collected sensor parameters. When the controller detects the cavitation risk, it controls the exhaust device to work. The exhaust device consists of an exhaust valve and an exhaust pipe. When cavitation occurs, the exhaust valve opens. Under the action of pressure, the gas in the water pump introduces the gas or liquid into the sewage pit through the drainage pipe.

[0025] The basis for judging cavitation based on pressure data, temperature data, and vibration data is as follows:

[0026] Temperature: If cavitation occurs, the liquid flow into the pump will be reduced, so that the friction heat of the pump cannot be taken away in time, resulting in an increase in the surface temperature of the pump casing;

[0027] Pressure: If cavitation occurs, the amount of liquid entering the pump will be reduced, resulting in lower output pressure and frequent and severe pressure fluctuations.

[0028] Vibration: If cavitation occurs, it will cause the pump's suction to be unstable and the vibration amplitude to increase;

[0029] During normal operation, the temperature and pressure of the water pump are relatively stable, and the vibration is within a normal operating range. When the water pump cavitation occurs, the temperature of the pump body will rise by about 10℃~15℃, and the impeller's working ability will decrease. The pressure affected by the water flow energy conversion will fluctuate by 10%~30%. During cavitation, the impact force generated by the bursting of bubbles inside the pump body will stimulate the vibration of the pump structure to a vibration speed of 5mm / s-10mm / s. However, cavitation determination may also be affected by the outside world. From the temperature point of view, it will be affected by many factors such as environmental factors, the heat dissipation conditions of the pump body itself, and the operating time. Pressure changes may also be caused by other factors, such as pipeline leakage, inlet blockage, etc. Relatively speaking, vibration data can better reflect the cavitation of the water pump. When cavitation occurs, the vibration frequency component will become complicated. When the water pump is operating normally, the relationship between the blade frequency f_ (unit: Hz) and the impeller speed n (unit: r / min) and the number of impeller blades Z is f=nZ / 60; for example, the water pump runs at a speed of 1500r / min and the number of blades does not exceed 12. The vibration frequency is generally less than 300Hz, but the bubble burst caused by water pump cavitation will produce high-frequency shocks. These high-frequency components may be at several thousand hertz or even higher. The specific needs are determined according to the water pump model and the actual working environment (including installation settings). Water pump cavitation can be determined by a comprehensive method, using the abnormal vibration data conditions and the temperature or pressure abnormal conditions to determine whether cavitation occurs. Once it is determined that the water pump is cavitating, the exhaust device 5 is immediately started to quickly exhaust the gas to ensure the normal operation of the water pump.

[0030] The control module 1 is also used to receive the disconnection and other fault data monitored by the sensor module. If the disconnection and other fault data monitored by the sensor module are received, an early warning signal is sent to the remote monitoring system through the communication module 2;

[0031] The communication module 2 is used to realize data transmission between the control module 1 and the remote monitoring system. The corresponding communication interface and communication protocol can be selected according to the actual needs of the engineering project. The present invention uses the RJ45 network interface and adopts the ModbusTCP communication protocol to transmit the collected data and analysis results to the remote control center in real time, which is convenient for remote monitoring and management by the operating personnel.

[0032] The parameter display and adjustment module 3 is used to display the current operating status information of the water pump. It can also adjust parameters and limit values ​​according to different working conditions, making it convenient for on-site personnel to adjust the cavitation judgment parameters according to different working conditions.

[0033] A water pump cavitation monitoring and control system can be applied to the constant pressure water supply system of the secondary pipe network of the heat exchange station of the heating system. The temperature sensor module and the vibration sensor module are installed on the body of the water supply pump, and the pressure sensor module is installed at the outlet of the water supply pump to ensure the normal operation of each component. The exhaust hole of the water supply pump is connected to the exhaust pipe by threaded connection, and the exhaust pipe is connected to the exhaust valve. After the installation of each module, the temperature, pressure and vibration alarm thresholds are set according to the working requirements and actual conditions of the water supply pump. When cavitation occurs during the operation of the water pump, the controller opens the exhaust valve through system judgment. If the system parameters are still in an abnormal state after a certain period of time, the staff will be reminded. At the same time, the staff can monitor and manage the water supply pump in real time through the remote monitoring system, and can also operate and maintain it on site according to the information of the display module. The water pump cavitation monitoring and control system can play an important role in the water supply pump of the heating station, improving the operating efficiency and reliability of the heating station.

[0034] The above calculation examples of the present invention are only used to explain the calculation model and calculation process of the present invention in detail, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A water pump cavitation monitoring and control system, characterized in that: include: Control module (1), sensor module (4), exhaust device (5); Sensor module (4): used for real-time monitoring of the running status data of the water pump, including pressure data, temperature data, and vibration data, and transmitting the collected data to the control module (1); A control module (1) determines cavitation based on pressure data, temperature data, and vibration data, and controls the operation of the exhaust device (5) according to the determination result; The basis for determining cavitation based on pressure data, temperature data, and vibration data is: vibration data anomaly, and temperature anomaly or pressure anomaly is satisfied.

2. A water pump cavitation monitoring and control system according to claim 1, characterized in that: The sensor module (4) comprises a pressure sensor, a vibration sensor and a temperature sensor, all of which are arranged on the water pump.

3. A water pump cavitation monitoring and control system according to claim 1, characterized in that: Abnormal vibration data means that the high-frequency component in the vibration frequency data is greater than or equal to the vibration frequency threshold.

4. A water pump cavitation monitoring and control system according to claim 1, characterized in that: Temperature abnormality means that the pump body temperature is 10℃~15℃ higher than the normal working pump body temperature.

5. A water pump cavitation monitoring and control system according to claim 1, characterized in that: Abnormal pressure refers to pressure fluctuations between 10% and 30%.

6. A water pump cavitation monitoring and control system according to any one of claims 1 to 5, characterized in that: The system further comprises a communication module (2), wherein the communication module (2) is used to realize data transmission between the control module (1) and the remote monitoring system.

7. A water pump cavitation monitoring and control system according to claim 6, characterized in that: The control module (1) is also used to receive disconnection fault data detected by the sensor module, and if disconnection fault data detected by the sensor module is received, an early warning signal is sent to a remote monitoring system via the communication module (2).

8. A water pump cavitation monitoring and control system according to claim 6, characterized in that: The system further comprises a parameter display and adjustment module (3), which is used to display the current operating state information of the water pump and can also adjust parameters and limit values ​​according to different working conditions.

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