Vertical Line Shaft Pumps Vibration and Bearing SpacingVertical Line Shaft Pumps Vibration and Bearing Spacing 立式長軸泵振動與軸承跨距

Vertical Line Shaft Pumps Vibration and Bearing Spacing

立式長軸泵振動與軸承跨距

Problem 問題

Vertical line shaft pumps often struggle with vibration and resonance. Their long shafts inherently lack stiffness, making them highly susceptible to resonance when operating speeds approach the critical frequency. A key strategy to boost stiffness and prevent resonance is to shorten bearing spacing. But what are the established design standards for bearing spacing?

立式長軸泵因軸太長，所以剛性差，轉速接近共振臨界頻率，容易發生共振，縮短軸承跨距可提高剛性，避免發生共振，但軸承跨距有什麼設計標準?

Standards of bearing spacing 軸承跨距標準

ANSI/HI 2.3 Rotodynamic Vertical Pumps of Radial, Mixed, and Axial Flow Types for Design and Application §2.3.3.5: 1.5m~3m

ANSI/AWWA E103 Horizontal Centrifugal and Vertical Line Shaft Pumps §4.4.2.4.1: ≤1.5m

CJ/T 235 Vertical long shaft pump §Appendix A: Figure(Critical Speed, Shaft Diameter)