| 摘要 |
A screw rotor (10) has a housing (12) with an inlet port (18) and an outlet port (20), a male rotor (14) with helical threads (34, 36), and a female rot or (16) with helical grooves (38, 40). The helical threads (34, 36) and helical grooves (38, 40) are designed to eliminate the blow hole leak pathway for multiple-pitch screw rotor products as well as single-pitch screw rotor products. The male rotor has a pair of helical threads with a phase-offset aspect, and the female rotor has a corresponding pair of helical grooves. Th e female rotor counter-rotates with respect to the male rotor and each of the helical grooves respectively intermeshes in phase with each of the helical threads. The phase-offset aspect of the helical threads is formed by a pair of teeth (42, 44) bounding a toothless sector (46).
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