The Shaft Seal Is Not Contact With Mud Sand Pump Design And Mechanism Analysis

Centrifugal pump, one of the distribution equipment oil drilling rig mud pump and purification system certainly, now which axis seal life short existence, replacement and maintenance difficulties, mud leakage loss, pollution of the environment and other issues, Despite the current centrifugal pump has been used on the back of leaves, spiral sealed, anti-pressure-Seal, mechanical seals, Seal various forms of portfolio applications, a variety of new sealing material such as the combination of measures to some extent, solve the problem of pump leakage. However, in addressing this issue on the technology being used on those routes is the traditional mode of thinking, that is, from selection of wear-resistant materials, reduce the load seals regard to the study is difficult to fundamentally solve the problem.This paper cut off from the slurry seals direct contact with the start reverse thinking,and introduces a new type of centrifugal pump—seals had no contact with the slurrypump. Based on principles of Hydrodynamics, through special structural design, pump so that the process of the "gas block" effective partition slurry pump axis seal with the direct contact from the fundamental solution to the pump axis seal leakage seals and the short life, in addition to the design also has a small area, Efficient advantages.From the theoretical analysis and simulation software on the two new structures feasibility study, First in two-phase flow and fluid dynamics based on analysis of gas in the pump room, Due to the rotating axis formed by the whirlpool area of low pressure will form a "gas block" to cut off slurry seals and the direct contact; turn to fluid dynamics as the basis to establish the indoor air flow model, CFX software and used to analyze the flow rate, flow and pressure distribution further theoretically proved that the "gas block" the feasibility and reliability.The solution to the long-standing failure easily pump axis seal, slurry leakage issues with a new line of thought, the principle of resolving similar issues inspiration. This study for the development of a new type of centrifugal pump provides a theoretical and technical support.The design has won state utility model patents. ("Seals do not come in contact with the slurry pump" patent: ZL200420105829X).