Rubber screw rotor molding line applicable to screw-type volumetric pump

Abstract

The invention discloses a rubber screw rotor molding line applicable to a screw-type volumetric pump. The rubber screw rotor molding line comprises two sections of identical sealing curves g-h-i and five sections of identical force transferring curves a-b-c-d-e-f; and each of the five sections of force transferring curves a-b-c-d-e-f is formed by sequentially connecting a section of circular arc ab of a base circle D2, a section of equiamplitude hypocycloid bc which takes a small circle R as a movable circle and a pitch circle D as a fixed circle, a section of involute cd of the base circle D2, a section of equiamplitude epicycloid de which takes the small circle R as a movable circle and the pitch circle D as a fixed circle, and a section of Achimedean spiral ef beginning with the epicycloid apex e. When rubber screw rotors work, a contact area is reduced, the abrasion is reduced, the force transferring curves are completely continuously engaged, no leakage region or retention region exists, and strict sealing is formed; in addition, the transition is smooth, and the rubber screw rotor molding line is suitable for rubber molding; after assembly, the volumetric efficiency of the screw-type volumetric pump is high, and the overall efficiency is ideal; and the screw-type volumetric pump is especially suitable for use on working conditions of high flow rate, low lift and high abrasion requirement, and conveys a fluid containing micro solid particles.

Description

technical field [0001] The invention belongs to the technical field of screw positive displacement pumps, and in particular relates to a rubber screw rotor profile suitable for screw positive positive displacement pumps. Background technique [0002] The screw positive displacement pump relies on the change of the closed volume between the two screw rotors in the pump and the inner cavity of the pump to transport various fluids, and is widely used in microelectronics, semiconductors, pharmaceuticals, precision processing and other industries. The key technology of the screw positive displacement pump is a pair of screw rotors meshing with each other, and the design of the end surface profile of the screw rotor will directly affect the performance of the screw positive positive displacement pump, such as sealing, conveying efficiency, volume ratio, etc. Determines the processing difficulty of the screw rotor. In the prior art, metal screw rotor pumps are more common, and met...

AI Technical Summary

Problems solved by technology

In the prior art, metal screw rotor pumps are more common, and metal screw rotors are easier to form by turning. However, rubber screw rotor pumps have great differences in materials and processing techniques. For example, rubber will shrink when it is molded. The processing of the molding die is very complicated, too sharp transition is not conducive to rubber molding, the speed of the rubber screw rotor should not be too fast, etc., the existing metal screw rotor end surface molding line cannot be applied to the rubber screw rotor

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