Based on the vibration analysis of the unit, a shutdown inspection was scheduled. During the inspection, it was confirmed that the self-positioning of the No. 4 bearing was normal, and the tightness and clearance were within acceptable limits. The low-pressure rotor blades and the balance weights showed no signs of loosening, and the No. 4 shaft vibration probe was functioning properly. However, the short-axis coupling bolts between the low-pressure coupling were found to be unevenly tightened. Most of the bolts could be retightened, while several had been tightened by approximately 30 degrees, which raised concerns about their stability.
After adjusting the tightening force of the bolts, the abnormal vibration of the No. 4 shaft disappeared during the cranking process. However, when the unit speed reached 3000 r/min, the vertical vibration of the No. 4 shaft measured 102 micrometers, and the No. 5 shaft vibration reached 234 micrometers. Due to the excessive vibration of the No. 4 shaft, the No. 5 shaft vibration was also significantly out of range. As a result, it was decided to perform on-site dynamic balancing. After reassembling the low-pressure rotor and the low-pressure coupling, the vibration at each bearing was below 50 micrometers at 3000 r/min. Once the unit was connected to the grid and under load, all shaft vibrations remained within 76 micrometers, achieving the best vibration performance since the unit was commissioned.
Another issue identified was the insufficient tightening force of the exciter wheel or the axial movement of the exciter shaft. When the tightening force of the wheel bolts is inadequate, it can lead to noticeable movement in the No. 7 journal during static conditions. However, as the unit rotates, the bolt tightening force may change, resulting in abnormal vibration readings for the No. 7 shaft. During a recent shutdown review, it was observed that the movement at the No. 7 journal had changed, even exceeding the specified limits. This indicated the need for further attention to ensure proper bolt tightening and stable operation of the exciter system.
Pumps And Other Fountain Equipment
Submersible Pumps​
Submersible pumps are the workhorses of many fountain systems, designed to operate while fully submerged in water. Their compact and sealed construction allows them to fit seamlessly into various fountain designs, from small tabletop features to larger garden installations. These pumps are efficient at circulating water, creating gentle flows or more dynamic sprays depending on the model. They often come with adjustable flow rates, enabling users to customize the water display to their liking. Submersible pumps are relatively easy to install and maintain, making them a popular choice for both residential and commercial fountains.​
Centrifugal Pumps​
Centrifugal pumps are commonly used in larger fountain projects where higher water flow and pressure are required. They work by using a rotating impeller to create centrifugal force, which pushes water through the pump and into the fountain system. Unlike submersible pumps, centrifugal pumps are typically installed outside the water source, connected via pipes. They are capable of moving large volumes of water, making them suitable for grand fountains in parks, plazas, or public spaces. These pumps are known for their durability and high performance, but they may require more complex installation and regular maintenance to ensure optimal operation.​
Fountain nozzles are essential components that determine the shape and pattern of the water spray. There is a wide variety of nozzles available, each creating a unique effect. For example, jet nozzles produce a straight, powerful stream of water, while fan nozzles create a wide, flat spray resembling a fan. 雾化喷嘴 (Atomizing nozzles) can turn water into a fine mist, adding a mystical touch to the fountain. Some nozzles are designed to rotate, creating dynamic, ever-changing patterns. The choice of nozzle depends on the desired aesthetic of the fountain, as well as factors such as water pressure and flow rate.​
Lighting Systems​
Lighting systems play a crucial role in enhancing the visual appeal of fountains, especially during the evening and night. LED lights are the most commonly used type due to their energy efficiency, long lifespan, and ability to produce a wide range of colors. These lights can be submerged in water, safely illuminating the water sprays and creating stunning visual effects. Many fountain lighting systems come with color-changing capabilities, allowing users to set different moods and themes. They can be synchronized with the water patterns to create a coordinated audio-visual experience, making the fountain a focal point of any space.​
Control Panels​
Control panels are the brains behind the operation of more sophisticated fountain systems. They allow users to control various aspects of the fountain, such as water flow, spray patterns, lighting, and even timing. With a control panel, you can program the fountain to perform specific sequences at certain times, creating a dynamic and engaging display. Some advanced control panels can be operated remotely via a smartphone app, providing convenience and flexibility. They also help in monitoring the performance of the fountain components, alerting users to any issues that may arise, such as pump malfunctions or low water levels.
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