Double-screw pump without bearing

Abstract

The invention discloses a double-screw pump without a bearing. A tightly-fitting 8-shaped fitting surface which is arranged between the external surfaces of the main sub screw shaft and the sub screw shaft in a housing and the interior surface of a lining of the housing, is the main bearing-surface, so that there is no bearing in the working section. Helical grooves on the two screw shafts form a natural lubricating channel. In the process of pumping material, a lubricating liquid film with a certain thickness and a supporting liquid film are formed on the fitting surface by using the principal of dynamic and static pressure, and the heat generated from the fitting surface is taken away, so that a virtuous cycle forms. Two synchronous gears are arranged in the central sections of the main and the sub screw shaft, so as to improve the performance of suction greatly. The lining of the housing and the housing can be arranged as an integral structure or a detachable structure. A mechanical seal is arranged between the main screw shaft and a front end shield. The outer end of the mechanical seal can be provided with a small rolling bearing as an auxiliary bearing of seal. The double-screw pump without the bearing provided by the invention solves the problems of complicate structure, long dimension, bad rigidity, poor performance of suction and the like existing in the prior art, and can be used in places with high temperature, high pressure and the like that traditional double-screw pumps can not handle, especially is suitable for used in conveying clean material with high viscosity.

Description

[0001] (1) Technical field: Bearingless twin-screw pump is a twin-screw pump used for conveying liquid, which belongs to variable capacity pump of rotary screw (B05B). (two) background technology: [0002] The general layout of traditional twin-screw pumps includes the following two types: ① External bearing type, see figure 1 , with shell 1n and bushing 2n ( figure 1 The two are integrated), the main screw 4n, the auxiliary screw 3n, the front and rear end mechanical seals 6n, the external front and rear end covers 5n, the external front and rear bearings 7n, and the synchronous gearbox 8n. It can be seen that four sets of mechanical seals and four sets of bearings need to be installed in order to make the twin-screws run. ②Built-in bearing type, see figure 2 , with shell 1m and bushing 2m ( figure 2 The two are integrated), the main screw is 4m, the auxiliary screw is 3m, the built-in front and rear bearings are 7m, the mechanical seal is 6m, and the front and rear end ...

AI Technical Summary

Problems solved by technology

[0003] The bearingless twin-screw pump provided by the present invention is to solve the problems of the existing twin-screw pump such as complex structure, long axial dimension, poor rigidity and poor material suction.

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