Pump rotor with splayed top and involute combination profile

Abstract

The invention discloses a pump rotor with a splayed top and involute combination profile. The half-leaf theoretical profile consists of four parts, that is a peak concentric fan arc section, a peak weight reduction arc section, an involute arc section and a valley avoidance arc section, wherein the four parts are connected end to end. A maximum shape coefficient of the pump rotor is effectively improved compared with that of a common rotor, and the more number of blades of the rotor, the more obvious the synergism is; the peak weight reduction arc section enables the center of gravity of the blades to shift to the valley, so that the alleviating of dynamic imbalance of a rotor system and reducing of vibration faults are facilitated; the splayed top of the peak concentric fan arc section enables radial leakage to be lower; and the valley avoidance arc section can simplify the processing of the valley avoidance arc section part of the rotor, so that the so-called air-tight phenomenon that two positions are conjugate at the same time is avoided.

Description

technical field [0001] The invention belongs to the technical field of involute rotors for Roots pumps, and in particular relates to a pump rotor with a splayed crown and an involute combined profile. Background technique [0002] Roots pump is a rotary positive displacement pump. Its working principle is similar to gear pump. It has the characteristics of simple principle, small size, light weight, low cost, good sealing performance and no pollution. It is widely used in medium transportation, vacuum pumping, drum pumping, etc. wind etc. [0003] The shape factor of the rotor directly determines the medium output of the pump, and the pursuit of a larger shape factor is an eternal theme of its design. Among the rotors seen at present, the involute rotor is more common, and its maximum shape coefficient is also very large, and the processing method of the involute is quite mature. The maximum shape coefficient of the rotor with 2 lobes is 1.6177, and the maximum The shape f...

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Problems solved by technology

Among the rotors seen so far, the involute rotor is more common, and its maximum shape coefficient is also very large, and the processing method of the involute is quite mature. The maximum shape coefficient of the rotor with 2 lobes is 1.6177, and the maximum The shape factor is 1.4639, but there are certain defects: 1. The contact between the rotor top and the pump casing is a line contact in the width direction, and the radial leakage is large; Balance and reduce vibration failure

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