Common sense of high-speed centrifugal pump (partial flow pump)

High-speed centrifugal pump is driven by the machine, gearbox and pump three parts. The vertical structure of the more widely used, the power of 7.5 ~ 132kW; when the drive power exceeds 160 kW, the use of horizontal structure. Pumps and speed increasers are enclosed structures that can be used outdoors. High-speed centrifugal pump impeller is fully open, there is no front and rear cover, the blade is a radial straight blade, there are general impeller and induction wheel with impeller structure of two types; impeller mounted on the pump shaft, the pump shaft and growth The high-speed shaft of the pump is directly connected. The water pressure chamber in the pump body is annular and has a small space. One or two conical diffuser tubes are arranged around the water pressure chamber, and the inlet of the diffuser tube is provided with a nozzle. Great influence. Because the impeller is open, almost no axial force is generated in operation, so there is no axial balance device; the gap between the impeller and the pump casing is large, usually 2 ~ 3mm, no seal ring is needed between the pump casing and the impeller . Seal device with static spring-type mechanical seal, the pump has a cyclone separator, used to transport a small amount of liquid purified after the introduction of mechanical seals for lubrication and cooling. The pump speed is achieved through the gearbox, so the gearbox is one of the key components of a high-speed pump. High-speed pump for high-lift, small flow situations; due to the large gap between the impeller and the shell, it can be used to transport solids containing particles and high viscosity liquid; impeller with induction wheel has good resistance to cavitation. The pump is compact, low mass, small volume, small footprint, basic engineering is relatively simple, but the processing accuracy is high, manufacturing more difficult.