A pump rotor with offset main arc and splayed top

Abstract

The invention relates to a Roots pump rotor with an offset main arc and a splayed top. The valley conjugate arc segment of the main arc segment and the valley avoidance arc segment corresponding to the fan point are composed of 5 parts connected end to end, in which the radius of the starting point of the offset main arc exceeds the peak node; the end point of the offset main arc segment is the rotor The node of the vice; the peak weight reduction arc segment is uniquely determined by the three conditions of passing the fan point and the starting point of the offset main arc segment and tangent to the radius line of the fan point; the valley avoidance arc segment is determined by the conjugate arc segment of the valley passing The three conditions of the end point, the valley point and the center of the circle are uniquely determined on the valley axis, so that the center of gravity of the rotor blade is biased towards the valley, lower radial leakage and larger rotor shape factor.

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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