Introduction to bearing materials for drainage pumps
The bearing material of the drainage pump is a key factor affecting its performance and life. Choosing the right bearing material for the drainage pump is essential to ensure the normal operation of the water pump and extend its service life. The following is a brief introduction to the bearing materials of the drainage pump:
1. Metal materials
Bearing alloy (Babbitt alloy or white alloy): The main components are tin, lead, antimony, and copper, which are used to improve the strength and hardness of the alloy. Among them, tin-based alloys are commonly used due to their excellent performance and are suitable for working environments below 150°C.
Copper-based alloys: They have high thermal conductivity and wear resistance, and the inner wall can be finely machined and contact the smooth surface of the shaft. Commonly used are brass, bronze, and copper-lead alloy (lead bronze), which are suitable for water pump bearings with different load and speed requirements.
Wear-resistant cast iron and aluminum-based alloys: These materials also have certain wear resistance and strength, but the specific selection needs to be determined according to the working environment and requirements.
2. Non-metallic materials
Polytetrafluoroethylene (PTFE): It has a low friction coefficient, good self-lubrication and corrosion resistance, and is suitable for water pumps with high speed and wear resistance requirements. However, its shortcomings such as large linear expansion coefficient, poor dimensional stability, and poor thermal conductivity need to be noted.
Graphite: It is a good self-lubricating material, easy to process and smoother with grinding. However, its mechanical properties are poor and it is only suitable for light load occasions. In order to improve its performance, impregnation treatment is often used, such as impregnation with babbitt alloy, copper alloy, etc.
Rubber: It has good elasticity and vibration absorption, but poor thermal conductivity, difficult processing, and requires circulating water lubrication and cooling. Therefore, it is rarely used in water pump bearings.
When selecting drainage pump bearing materials, it is necessary to comprehensively consider factors such as working environment, load, speed, and temperature. For example, in harsh environments such as humidity, high temperature, and high speed, stainless steel bearings are favored for their good corrosion resistance and wear resistance; while under heavy load or impact load conditions, copper-based alloys are widely used for their high strength and wear resistance. At the same time, in order to improve the life and performance of bearings, surface treatment technology, heat treatment technology, and other means can also be used to optimize the bearing material.
