The rotor of the rotor of the pump

of the rotor of the rotor pump, often referred to as the axis between two rotor and bearing the centerline of the tilt and offset degree: the rotor can be divided into the coupling misalignment in the bearing is not right. Of the coupler is wrong: can be divided into parallel Angle of the parallel misalignment Angle three conditions:

1. Parallel to the right when the vibration frequency of rotor twice the power frequency;

2。 Right Angle of the coupling attached a bending moment, to try to reduce the Angle of the center line of the two axes. A week each axis rotation, the bending moments of alternating direction once, therefore, right Angle increased in the axial force of the rotor, the rotor in axial vibration frequency;

3。 Parallel Angle in the wrong is a combination of the above two cases, result in radial and axial vibration of the rotor. Bearing no bearing seat is actually reflected in elevation and shaft center position deviation. Of the bearing is wrong: in the bearing shaft load redistribution. Large bearing load may appear higher harmonic vibration, lighter load bearing instability, more easily also cause changes in the critical speed of the axis. No fault is characterized by:

1. Stainless steel rotor pump rotor radial vibration appears twice the frequency, with double and double frequency component is given priority to, the more serious in the shaft system is wrong, double frequency the greater the proportion of, often appear even double frequency energy more than doubled frequency;

2。 Vibration signal of the original in the time domain waveform distortion of sine wave;

3。 Coupling on both sides of the adjacent two bearing oil film pressure changes in the opposite direction, an oil film pressure, the other is smaller;

4。 Coupling is wrong when axial vibration is larger, vibration frequency as double frequency, vibration amplitude and phase stability;

5。 Coupling the axial vibration of two side is basically presents the 180 ° inverse;

6。 Typical axis path for the crescent, banana, of the severely malnourished axis trajectory may appear '8' glyph; Direction is for synchronous precession vortex.

7。 Vibration is sensitive to load changes. When the load changes, the coupling transmission torque change immediately, if the coupling is not right, then the vibration of the rotor state also immediately change generally increased with the increase of load vibration amplitude;

8。 Bearing not included in the right Angle and elevation changes in two cases, right in the middle of the radial bearing vibration is larger, likely higher harmonic, unstable vibration. Caused by uneven heat expansion of the bearing and the bearing in the wrong, make the vibration of the rotor will change too. The change of the vibration inertia, but as a result of heat conduction in time than the load change lag for a period of time. Imbalance is the most common of all kinds of rotating machinery, the causes of unbalanced rotor are various:

1. Rotor water pump rotor the unreasonable structural design, mechanical processing quality deviation, assembly error, material uneven, dynamic balancing precision is poor;

2。 The change of the coupling in the operation of the relative position;

3。 High viscosity rotor pump rotor parts defect, such as: in the operation of the uneven due to corrosion, wear, medium scale, fall off;

4。 CAM rotor pump rotor caused by fatigue stress of rotor parts ( Such as impeller, vane, bandage, brace, etc. ) Local damage, fall off, fly out of the debris. Unbalanced rotor vibration signal, the time waveform and spectrum diagram generally has the following characteristic:

1. The shape of the original time domain waveform close to a pure sine wave;

2。 Vibration signal spectrum diagram, the harmonic energy is mainly concentrated on the working frequency of the rotor, 1 x) That the fundamental frequency vibration component proportion is large, while other times frequency component proportion is relatively small;

3。 In the process of lifting speed, when the speed is lower than the critical speed, amplitude rises with the increase of the rotational speed. When speed across the critical speed, the amplitude decreases with increasing rotating speed, and tends to a stable value of the smaller. When rotation speed is equal to or close to the critical speed, the rotor will resonate, now has the largest amplitude of the peak;

4。 When the work speed must, vibration phase stability;

5。 The rotor axis path diagram of oval;

6。 The rotor of the water pump rotor vortex characteristics for the synchronous precession; Unbalanced rotor vibration signal, the time waveform and spectrum diagram generally has the following characteristic:

1. Two pure static unbalance bearing rotor bearing the same direction of vibration phase, while two pure couple unbalance bearing rotor bearing vibration is reverse phase, the phase difference of 180 °. But the actual rotor generally exists certain static unbalance, and there is a couple unbalance ( Is dynamic imbalance) , at which point the two bearing rotor bearing the same direction of vibration phase difference between 0 ° ~ 180 ° change;

2。 In the case of overhung rotor imbalance may produce a lot of axial vibration. The rotor imbalance, overhanging end bearing rotor axial vibration of two bearing same phase;

3。 Uneven medium scale, power frequency amplitude and phase is slowly changing.

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