Rotor for pump and with offset main arc and split top

Abstract

The invention relates to a rotor for a Roots pump and with an offset main arc and a split top. A half leaf theoretical profile is formed by connecting a peak concentric fan arc section, a peak weightloss circular arc section, an offset main arc section, a valley conjugated arc section of the offset main arc section, and a valley avoidance arc section corresponding to a fan point end to end. The starting radius of the offset main arc passes through a peak node. A terminal point of the offset main arc section is a joint of a rotor pair. The peak weight loss circular arc section is only determined by a fan passing point and a starting point of the offset main arc section and is tangent to the radius line of the fan point. The valley avoidance arc section is determined by a terminal point passing through the valley conjugated arc section, a valley point and a circle center on a valley axis. The barycenter of a rotor leaf deflects towards a valley part, radial leakage is lower, and rotor shape coefficient is higher.

Description

technical field [0001] The invention relates to a rotor for a Roots pump with an offset main arc and a splayed crown. 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 of the rotor is an eternal theme of its design. Among them, among all the current pump rotors, arc rotors are the most common and have the largest shape factor, with two lobes being ε 0 = 1.67, for 3 leaves ε 0 = 1.48; but the disadvantage is that the center of gravity of the rotor blade is biased towards the peak, which is not conducive to alleviating the dynamic imbalance of the roto...

AI Technical Summary

Problems solved by technology

Among them, among all the current pump rotors, arc rotors are the most common and have the largest shape factor, with two lobes being ε 0 = 1.67, for 3 leaves ε 0 = 1.48; but the disadvantage is that the center of gravity of the rotor blades is biased towards the peak, which is not conducive to alleviating the dynamic imbalance of the rotor system and reducing vibration faults; the radial leakage at the top of the rotor is large

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