1. Vibration characteristics under normal operation
During continuous operation, the High Pressure Online Circulation Pump will normally vibrate to a certain extent. This vibration mainly comes from the high-speed rotation of the rotating parts of the pump, such as the impeller. When the impeller rotates, periodic vibrations will occur due to factors such as uneven mass distribution, slight errors in the manufacturing process, or the force of the medium on the impeller. Generally speaking, the amplitude of normal vibration is relatively small and usually within the range specified by the design. For example, for a precision-manufactured High Pressure Online Circulation Pump, the axial vibration amplitude may be between 0.05 - 0.15 mm, and the radial vibration amplitude may be between 0.1 - 0.3 mm. The frequency of vibration is often related to the rotation speed of the impeller, which is usually an integer multiple of the impeller rotation frequency. This is because the unbalanced force of the impeller, the excitation force of the fluid on the impeller, etc. will produce a vibration frequency component based on the impeller rotation frequency.
2. Factors affecting vibration and corresponding performance
Pump flow rate has a significant impact on vibration. When the flow rate deviates from the rated flow rate, the fluid flow state in the pump changes. For example, under low flow conditions, backflow may occur, which causes unstable fluid forces on the impeller, thereby increasing the vibration amplitude. In this case, the vibration frequency may become complex. In addition to the frequency related to the impeller speed, low-frequency pulsation frequencies may also occur, and the vibration amplitude may increase from the upper limit of the normal range to 0.3 - 0.5 mm. Under high flow conditions, due to the increased impact force of the fluid on the impeller, the vibration may also be intensified, and the axial vibration may increase to about 0.15 - 0.25 mm.
In addition, the foundation on which the pump is installed will also affect vibration conditions. If the installation foundation is not solid, the vibration of the pump will be transmitted through the foundation and amplified during continuous operation. For example, if installed on an uneven or insufficiently rigid foundation, the vibration amplitude of the pump may increase by 30% - 50% compared to when installed on an ideal foundation, and may cause resonance of the foundation and surrounding equipment, leading to the stability of the entire system. sexual decline.
3. Measures to monitor and control vibration
To ensure the stability of the pump in continuous operation, vibration needs to be monitored. Vibration sensors, such as acceleration sensors or displacement sensors, are usually used to monitor the vibration amplitude and frequency of the pump in real time. Once the vibration exceeds the set threshold, the control system will sound an alarm and take appropriate measures. For example, the operating parameters of the pump can be adjusted, such as changing the speed of the impeller through frequency conversion speed regulation, so that the pump can return to normal operating conditions. At the same time, measures are also taken to reduce vibration during the pump design and manufacturing process. For example, high-precision dynamic balance correction is performed on the impeller to control the imbalance of the impeller within a very small range to reduce the vibration caused by the imbalance of the impeller. During installation, ensure that there are good shock-absorbing measures between the pump and the foundation, such as using rubber shock-absorbing pads, etc., to reduce the transmission of vibration.
