Spiral seal

2021-10-12View Original

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A spiral seal is also a type of dynamic seal; it features spiral grooves machined on a rotating shaft or on the sleeve that surrounds the shaft, with a sealing medium filled between the shaft and the sleeve. The rotation of the shaft creates a pumping action similar to that of a pump in the helical groove, thereby preventing the leakage of the sealing fluid. Its sealing capacity depends on the helix angle, pitch, tooth width, tooth height, effective length of the tooth, as well as the gap between the shaft and the sleeve. Since there is no friction between the seals, their lifespan is long; however, due to constraints on the available space, their spiral length is generally short, which limits their sealing capacity. When the pump operates at reduced speed, its sealing performance is significantly reduced.

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Spiral seal

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