Pumps are used for the conveying action in the liquid transportation of equipment and production processes

Pumps are the power source for transporting liquids in equipment and production processes. Once a pump malfunctions, it will cause malfunctions in other equipment, leading to production halts. The higher the manufacturing cost of the pump and the more complex its working mode, the greater the importance of continuously measuring and monitoring the working status of the pump. Especially when some faults have occurred in the pump but have not yet led to a shutdown accident, it is very necessary to take relevant monitoring measures. Because the pump is highly sensitive to the condition of the equipment, it also serves as an indicator reflecting the equipment's status. For instance, damage to the slip ring seal and the operation of the sliding bearing without lubrication, as well as cavitation causing damage to the working wheel and casing, etc.

To enhance the usability of the equipment, it is essential to understand the interrelationship between the equipment status and the pump body response. This is also the fundamental prerequisite and starting point for developing a new intelligent circulating pump status diagnosis and measurement system, with the aim of transforming this logical relationship into the minimum configuration of sensing elements. From the analysis of fault statistics by service institutions and users, it can be seen that using 2 to 3 sensing elements is sufficient to determine the operating status of the pump and to a certain extent diagnose the pump body. The application of the sensing element is:

It was identified that the pump was operating without lubrication.

Measure the temperature of the bearing; Measure the vibration amplitude of the pump.

For users of this kind of equipment, it is extremely important to be able to express the working state of the pump body in a concise way. Therefore, it is not feasible to measure a value with a measuring device, interpret each measured value separately, and then integrate all the measured values.

In this case, users must make their own logical reasoning and draw conclusions based on a comprehensive analysis of the data. It is also a very important step to set the corresponding threshold for pre-alarm based on actual work. However, this approach requires users to have a certain understanding of the basic knowledge of pumps in order to set appropriate thresholds for them. If such measures merely serve to prevent malfunctions, then their ability to describe the working condition of the pump body is very limited. When it is determined that the pump body is in an abnormal working state, people often raise the question of which component on the pump body has been damaged. Therefore, the evaluation of the working condition of the pump body should not merely be limited to the simple determination of individual limit values. If the data provided by each sensor is intelligently and intensively measured and evaluated, it will be possible to far exceed the evaluation range of individual indicators, and thereby comprehensively grasp the working status of the pump body and equipment. For this purpose, the diagnostic system of the circulating Pump - Pump Expert - can be used. This system can effectively monitor the working status of the pump body and the equipment with only a small number of sensor elements installed on the pump body. The various signals of the system are interconnected and compared and adjusted with the stored intelligent experts.

In addition, intelligent diagnostic methods such as fault list analysis methods can also be adopted. First of all, it is necessary to select convincing measurement values from the incorrect tree structure. For each group of measurement values, a corresponding measurement threshold is set, and then these values are logically connected to each other. An error report is generated based on the connection status and displayed on the monitor. When making intelligent selections, threshold determinations and connections, this method can also provide some additional information: when the pump body has not yet reached the set threshold, the logical connection unit will send a signal, indicating that the pump body will enter a dangerous state. With the help of electronic devices and microprocessors, these data and signals can be connected.

Adopting this method can promptly determine the location of the damaged parts of the pump body, and sometimes even the cause of the fault can be determined. The user of the pump body can make statements such as: the sliding bearing is damaged or worn, the working wheel is stuck, the viscosity of the conveyed liquid medium is too high, the adjustment is incorrect, the equipment is not filled with liquid, the liquid contains too much gas, the flow is interrupted, and the cooling of the bearing housing is disturbed by the cooling air of the motor.

The feature of this new method is to automatically and comprehensively evaluate the data and provide specific processing suggestions to the operators. Local communication through the display, local infrared interface, bus connection, and remote data transmission all create conditions for the utilization of information. At present, all available communication means can be utilized. Users can not only prevent individual pump bodies from malfunctioning, but also keep track of the operating status of the equipment from it. The Pump Expert system is renowned for its display and operation interface with the latest human-computer interaction technology, as well as its simple operation and easy-to-learn and understand features.

The diagnostic and communication contents can be flexibly set according to various usage scenarios. The installation of the system is also very simple. This system is also applicable to various types of pump bodies. The obtained data and information can also be transmitted to the upper-level management system for its use. The explosion-proof Pump Expert system can be applied in areas with explosion hazards.

The combined analysis of data and information represents a significant advancement in improving the operational efficiency of the pump body and the entire process. It reduces the intensity of service and maintenance work and marks the first step towards preventive maintenance.