Experiental table device and experimental method for testing gap exciting force characteristic of front cover plate of centrifugal pump

Abstract

The invention provides an experimental table device for testing gap exciting force characteristic of a front cover plate of a centrifugal pump. The experimental table device is used for detecting thefront cover plate and comprises a shell, a spindle and a base, both the shell and the front cover plate sleeve the spindle, a gap is formed between the shell and the front cover plate, and a measuringloop is formed; the measuring loop is connected with a drainage tube, a workbench and a propelling block are slidably arranged at the top of the base and fixedly connected, a gasket is arranged at the top of the workbench, the shell is positioned at the top of the gasket, a threaded hole is formed in the propelling block and matched with a screw in use, and the screw is fixedly connected with a valve. Only the front cover plate and a spindle set part connected with the front cover plate need to be mounted and demounted, so that the experimental table device is simple and convenient to mount and demount, and no damage is caused to other parts in the process of mounting and demounting, so that experimental efficiency is improved greatly, experimental period is shortened, experimental accuracy is improved, and experimental errors caused by other factors are reduced.

Description

technical field [0001] The invention relates to the technical field of a rotating machine experiment, in particular to an experimental bench device and an experimental method for measuring the characteristics of the exciting force of the front cover plate gap of a centrifugal pump. Background technique [0002] Centrifugal pumps play an extremely important role in aerospace, shipbuilding, petrochemical and other fields, and the problems caused by their vibration become more and more prominent. The problems of centrifugal pump vibration and shafting rotor dynamics are getting more and more attention. In addition, while the centrifugal pump transmits the fluid medium, it is also stimulated by the fluid in the pump to the impeller. These forces act as the external excitation of the pump rotor, affecting the dynamic response of the pump rotor, and even the stability of the work. Among them, the excitation force of the gap between the front cover plate of the rotating impeller a...

AI Technical Summary

Problems solved by technology

Although CFD technology can simulate the flow field in the sealed chamber very well and has good accuracy in calculating the leakage of the seal, it is still difficult to further study the influence of the flow field on the dynamics of the rotor system

The application of the analytical model of the fluid excitation force can well study the nonlinear influence of the fluid excitation in the seal on the rotor system, but the analytical model contains many experimental parameters and empirical coefficients

The rotor sealing test bench can only be designed according to the principle of similarity for relevant data testing, and the experimental conditions have a great influence on the test results

[0005] Using the perturbation method to solve the bulk flow model requires a lot of programming time, and, for complex models, there are certain limitations

However, the existing CFD software needs to draw grids when simulating the rotor, and it takes a lot of time to perform simulation calculations.

[0006] To sum up, the existing research is mainly based on the perturbation method and CFD, and there are few test benches for the rotor dynamics system under the gap flow field of the centrifugal pump front cover, and the working conditions are single, which is not enough to realize the rotor system model and leakage flow. Impact

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