4. What are the characteristics of the oil seal and sealing structure of screw pumps?
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The shaft seal of a screw pump is generally designed as a rubber-reinforced oil seal, which should be replaced during each major overhaul. It consists of a lip seal made from materials such as nylon or polyethylene, and it boasts excellent wear and pressure resistance. It can operate in environments where the surface finish of the shaft is not high and the lubrication conditions are somewhat poor. Its suitable operating temperature range is from –70 to +100°C, and it can be used with oils, water, and other fluids at pressures below 0.01 MPa. The seal ring has limited resilience, so wire rings or similar elements are typically used to enhance its sealing performance.
The oil seal and sealing structure characteristics of screw pumps mainly include the following aspects: 1. The shaft seal is a rubber-skeleton oil seal, which possesses wear resistance and pressure resistance, making it suitable for operation in environments with low surface finish and poor lubrication conditions. 2. The shaft seal uses lip seals made of materials such as nylon and polyethylene, which can effectively prevent leaks of oil, water, and other fluids. 3. The temperature range for the sealing ring is from -70°C to +100°C; it can be used in oils, water, and other media at pressures below 0.01 MPa. 4. The resilience of the sealing ring is poor; generally, wire rings or similar elements are used to provide additional elasticity in order to improve the sealing performance. In summary, the oil seal and sealing structure of screw pumps are designed to prevent leakage of the medium inside the pump; they also possess wear resistance and pressure resistance, making them suitable for operation under various temperature and pressure conditions. .