Fully-coated anti-corrosion magnetic pump shaft with impeller capable of being locked in a dual mode

Abstract

The invention relates to a fully-coated anti-corrosion magnetic pump shaft with an impeller capable of being locked in a dual mode. The pump shaft comprises a pump shaft body and the impeller. The pump shaft body is provided with a center hole, a metal core, a shaft shoulder, a key groove and a bolt hole. A polyether-ether-ketone injection molding coating is arranged on the total surface of a hollow metal core of the pump shaft. The impeller and the pump shaft are connected through a key, an impeller nut and an impeller bolt in a locked mode. The locking direction of the impeller nut is opposite to the rotating direction of the impeller. The total surface of the hollow metal core of the pump shaft is coated with the polyether-ether-ketone injection molding coating so that the pump shaft can be wrapped completely, permeation of corrosive media is eradicated, and therefore the service life of the pump shaft is prolonged; by adopting the impeller nut capable of locking the impeller on the pump shaft and an impeller screw locking the impeller nut on the pump shaft, the dual-locking purpose is achieved, the safe operation of the impeller is well ensured by means of the dual-locking structure, and it is ensured that the dual-locking structure is not prone to loosening.

Description

technical field [0001] The invention relates to a shaft, in particular to a fully covered corrosion-resistant magnetic pump shaft with double-lockable impellers. Background technique [0002] Due to the characteristics of full sealing, no leakage, and corrosion resistance, magnetic pumps are currently used more and more widely, especially in the chemical industry, where they are often used to transport chemical liquids. At the same time, due to the long-term transportation of chemical liquids, it has a great impact on the service life of the components of the magnetic pump that are in contact with corrosive liquids, especially the pump shaft of the key components, which bears a lot of strength and high temperature during work, and at the same time must meet the requirements of corrosion resistance. The requirements of ceramic pump shafts are usually used. Because of its low mechanical strength, it can only be used for small magnetic pumps. The pump shaft strength of high...

AI Technical Summary

Problems solved by technology

At the same time, due to the long-term transportation of chemical liquids, it has a great impact on the service life of the components of the magnetic pump that are in contact with corrosive liquids, especially the pump shaft of the key components, which bears a lot of strength and high temperature during work, and at the same time must meet the requirements of corrosion resistance. The requirements of ceramic pump shafts are usually used. Because of its low mechanical strength, it can only be used for small magnetic pumps. The pump shaft strength of high-nickel alloy steel can meet the requirements. However, due to the harsh working environment and short service life, it has become a magnetic pump. The life of each part in the pump is short, and the replacement of the pump shaft not only increases the direct cost, but more importantly, affects the production process. Usually, several shutdowns are required to replace the pump shaft between each overhaul, and the indirect economic loss is very large. To install the impeller, generally put a conical cap to fix the impeller on the pump shaft, and fix the conical cap on the pump shaft through bolts, but the impeller will generate a huge axial force, which is transmitted to the bolt through the conical cap In general, after running for a long time, the bolts will loosen or even break. In this case, the rotation of the impeller in the non-locked state will generate a huge overturning moment, which will seriously affect the safe operation of the pump and lead to a surge in maintenance costs.

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