离心泵叶轮磨损破坏程度下的振动特性分析

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Abstract In order to study vibration characteristics of a centrifugal pump under different damage degrees of its blades at inlet edge, an IS-50-160-00 single-suction centrifugal pump was taken as the test object.To acquire influences of different damage degrees of impeller blades under the same damage mode on the pump vibration, 6 centrifugal pumps were used to do tests.The symmetrical 2, 4 and 6 inlet blades of these pumps were damaged.Acceleration sensors were arranged on these centrifugal pumps, vibration signals in radial, longitudinal, axial and pedestal directions under different operating conditions were collected, respectively.They were analyzed in time domain and in frequency domain, respectively.Vibration signals corresponding to cases of normal impeller blades and symmetrical 2, 4 and 6 inlet blades damaged were compared and analyzed, respectively to obtain vibration signal characteristics under different damage degrees of impeller.The test results showed that in time domain figures, the amplitude fluctuation of the axial vibration of the pump with two damaged blades is the largest, so its stability is the worst; in the frequency domain figures, damaged blades cause the pump rotation to lose balance and generate axial accompanying frequencies to increase vibration energy and a lot of high frequency components appear; in the statistical method, vibration energy decreases at first and then keeps steady with increase in flow rate, and vibration energy in all directions tends to be steady at designed case points; to study vibration characteristics of the centrifugal pump under different damage degrees of its impeller can provide a reference for fault monitoring and diagnosis of centrifugal pumps.

Key words： centrifugal pump damage impeller vibration time domain analysis spectrum domain analysis；

Received: 23 June 2017 Published: 28 December 2018

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I1/44

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