원심 펌프 내 BBSM의 성능 평가

Abstract

In this study, the Bleed Bushing Sealing Mechanism (BBSM) is used to prevent the fluid leakage in the gaps of casing and axis of a centrifugal pump. The BBSM is a novel and newly developed technology - which is both economical and durable - that we intend to use to fix the shortcomings of the existing packing systems such as the grand and mechanical seal packing systems. The BBSM is composed of a bushing which is attached to rotor blades which is further attached to the labyrinth seal, which has an Outlet through which water flows out. The rotor blade and the labyrinth seal have one bypass each. The bypass at the rotor blade carries water through it back into the pump, while the bypass at the labyrinth (which has seven teeth’s) seal carries water through it to the outside. The BBSM is resistant to wear and tear as it does not come into direct contact with the rotating shaft and sleeve. Hence, it is a novel concept (breakthrough in some ways), as this technology allows less heat generation of the structure by reducing the use of cooling water. The results show that the narrow gap between the bush and the shaft creates flow resistance which leads to high pressure and as a result, the outflow mass becomes less. Also, the fluid that is pushed back through the bypass at the rotor serves in reducing the leakage. Moreover, the results show that the labyrinth seal also helps in reducing the flow rate into the Inlet. Altogether, when the BBSM mechanism is used, it serves to reduce the overall leakage.