The generator stator cooling water centrifugal pump YCZ50-250 is a vital component of the power system. Its main function is to remove the heat generated by the generator stator winding during operation through circulating cooling water to ensure that the generator can work stably within a safe temperature range. In this process, the pump axle sleeve is a key component that supports the pump shaft and reduces friction. Its wear resistance and corrosion resistance directly affect the service life and working efficiency of the pump.

The YCZ50-250 shaft sleeve is made of wear-resistant and corrosion-resistant specially treated carbon steel material. In a high-performance centrifugal pump such as the YCZ50-250, the selection of sleeve material is particularly critical and must meet the following requirements:

• Wear resistance: The generator stator cooling water circulation may contain trace amounts of solid particles. Under long-term operation, these particles will cause wear on the sleeve. High-quality sleeve materials can resist this wear, reduce deformation, and extend service life. For example, stainless steel containing elements such as nickel and chromium is not only hard, but also has good wear resistance.
• Corrosion resistance: Cooling water may contain corrosive components such as acidic and alkaline substances and oxidants. Especially in the specific working environment of power plants, seawater cooling or cooling water with added chemicals will corrode the pump body material more seriously. Therefore, the sleeve material needs to have excellent corrosion resistance, such as copper alloys resistant to seawater corrosion or metal materials treated with surface plating to resist chemical erosion.

Recommended sleeve lubrication method

In order to further improve the service life of the sleeve and reduce energy consumption, a suitable lubrication method is essential. For the YCZ50-250 centrifugal pump sleeve, the following lubrication methods are recommended:

• Grease filling: Filling the contact surface between the sleeve and the journal with high-performance grease, such as composite ester-based grease, can effectively reduce dry friction and improve wear resistance. Suitable for occasions where continuous water supply is not possible or there are special requirements for lubrication. Regular inspection and replenishment of grease is the focus of maintenance.
• Oil bath lubrication: For some large or heavy-loaded centrifugal pumps, an oil pool or oil ring can be set to allow the sleeve to work in an oil bath, which can provide continuous and uniform lubrication. The selection of oil products needs to consider factors such as working temperature and corrosiveness. Synthetic oil or special pump oil is commonly used.
• Automatic lubrication system: In high-level applications, an automatic lubrication pump or distributor can be used to inject lubricating oil or grease into the sleeve regularly and quantitatively to ensure a constant lubrication state. Although this method is more expensive, it can greatly improve the reliability and maintenance convenience of the system.

In summary, the sleeve of the YCZ50-250 generator stator cooling water centrifugal pump emphasizes wear resistance and corrosion resistance in design and material selection to adapt to complex and changing working environments. A reasonable lubrication method is the key to ensuring the long-term stable operation of the sleeve, and it needs to be flexibly selected according to specific working conditions and maintenance conditions.
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