Method for researching influence of balance hole diameter on working state of centrifugal pump

Abstract

The invention discloses a method for researching the influence of the diameter of a balance hole on the working state of a centrifugal pump, which comprises the following steps: S1, selecting a research object, selecting a closed impeller centrifugal pump with an open balance hole double-sealing ring structure as the research object, and establishing a centrifugal pump three-dimensional model; s2, determining a numerical calculation method of the model, and performing numerical calculation on the model; s3, checking the calculation model, performing calculation domain grid division on the model, dividing the integral model of the centrifugal pump by adopting a hybrid grid division mode, and checking the model; and s4, analyzing a calculation result according to the relationship between the diameter of the balance hole and the flow characteristics of the rear pump cavity of the centrifugal pump and the friction loss of the disc. Through the research method, the influence of the diameter of the balance hole on the flowing rule of liquid in the rear pump cavity and friction loss of the disc is disclosed, and theoretical and scientific basis is provided for research on the influence of the diameter of the balance hole on the working state of the centrifugal pump.

Description

technical field [0001] The invention relates to the technical field of experimental research on centrifugal pumps, in particular to a method for studying the influence of the diameter of a balance hole on the working state of a centrifugal pump. Background technique [0002] A centrifugal pump is a pump that relies on the centrifugal force generated when the impeller rotates to transport liquid. Its main principle is to rely on the high-speed rotation of the impeller to force the liquid in the center of the impeller to be thrown away at a high speed, thereby forming a low-pressure, low-level groove in the center of the impeller. Therefore, the liquid in the pump is continuously sucked up, and then the work is carried out. In the work of the centrifugal pump, the axial force of the pump chamber behind the centrifugal pump and the friction loss of the disc are the two main factors affecting the working state of the centrifugal pump. Influencing factors; [0003] Among them, t...

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Problems solved by technology

[0003] Among them, the axial force is one of the most important factors affecting the service life and stable operation of the centrifugal pump. Due to the current incomplete research on the liquid flow mechanism in the pump chamber of the centrifugal pump, it is impossible to accurately calculate and balance the axial force of the centrifugal pump. , has become an important topic in the research of the pump industry; in the method of balancing the axial force by opening the balance hole on the back cover of the centrifugal pump impeller, the diameter of the balance hole is closely related to the magnitude of the axial force; the friction loss of the impeller disc is the largest mechanical loss of the centrifugal pump The most important energy loss, the prior art points out that the disc friction loss of the pump is determined by the relative rotational motion of the liquid in the impeller cover plate and its side cavity; at present, there are many studies on the liquid flow in the side cavity of the front cover plate of the centrifugal pump impeller In-depth research, and due to the balance hole, seal ring and other structures on the impeller back cover side of the centrifugal pump, the flow of the cavity on the back cover side of the impeller is more complicated than that on the front cover side, which affects the friction loss of the impeller disc of the centrifugal pump. , Gap leakage and axial force have great influence;

[0004] Therefore, it is of great significance to study the flow characteristics of the pump cavity and the friction loss of the disc after the centrifugal pump, which is of great significance to accurately calculate the axial force and reduce the energy loss, but in the prior art, there is no relevant research

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