Cantilever type single-suction small-flow two-screw pump

Abstract

The invention relates to a cantilever type single-suction small-flow two-screw pump. The cantilever type single-suction small-flow two-screw pump comprises a pump body, a driving shaft and a driven shaft, wherein the driving shaft and the driven shaft are arranged in the pump body in parallel, the driving shaft is provided with a left-handed spiral sleeve, the driven shaft is provided with a right-handed spiral sleeve, the driving shaft and the driven shaft are arranged on a bearing pedestal through a needle bearing and three rows of angular contact ball spindles, the pump body is fixed to thebearing pedestal through a fastening bolt, the bearing pedestal supported by the driving shaft and the driven shaft and a gear box are located on one side of the pump body, only two spiral sleeves are arranged, and the pump is of the single-suction structure. The pump has the beneficial effects that the mechanism is compact, each pump only needs two mechanical seals, the mounting size and weightof the pump are reduced, the manufacturing cost of the pump is reduced, and on the special application occasion of the low pressure and small flow, the two-screw pump of the particular structure is used for achieving fluid conveying.

Description

technical field [0001] The patent of the invention belongs to the technical field of twin-screw pumps, in particular to a cantilever type single-suction low-flow twin-screw pump. Background technique [0002] At present, the twin-screw pumps on the domestic and foreign markets are divided into general-purpose, high-temperature, and high-pressure types, and they have different structural forms such as vertical installation and horizontal installation. The high-temperature twin-screw pump belongs to the long-shaft series; the high-pressure twin-screw pump belongs to the thick-shaft and heavy-duty series, which is not within the scope of the pump patent comparison. At present, the general working conditions, that is, the temperature of the conveying medium is less than or equal to 150 °C and the pressure is less than or equal to 60 bar, are used in the general series of horizontal or vertical twin-screw pumps. [0003] However, in some special working conditions, such as food,...

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Problems solved by technology

[0004] The biggest problem of the pump with the above structure is that there is only one spiral sleeve on each shaft, and there is a pressure difference between the inlet and outlet. This pressure not only acts on the spiral sleeve to generate radial force, but also generates a large continuous axial load at the same time.

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