A constant-wall-thickness screw pump stator and its production process

Abstract

The invention discloses an equal-wall-thickness screw rod pump stator and a production process thereof. The equal-wall-thickness screw rod pump stator sequentially comprises a steel pipe body, a plastic layer and a rubber layer from outside to inside, wherein the inner surface of the steel pipe body is adhered with the outer surface of the plastic layer, and the steel pipe body and the plastic layer are concentrically arranged; and an inner spiral surface of the plastic layer is adhered with an outer spiral surface of the rubber layer. The invention further discloses a production process of the equal-wall-thickness screw rod pump stator; a three-layered structure is obtained by two times of injection molding and processing, so that not only can the production cost of the equal-wall-thickness screw rod pump stator be reduced, but also the processing precision is improved; and the technical problem that the machining length and the machining precision are limited in the prior art is completely solved.

Description

technical field [0001] The invention relates to the technical field of rubber products, in particular to a constant-wall thickness screw pump stator and a production process thereof. Background technique [0002] Screw pump is a rotary positive displacement pump, which can be used to transport liquid, solid-liquid mixture, and is widely used in oil and gas exploration, food, chemical industry and other industries. It is mainly composed of a stator and a rotor conjugated to it. Practice has proved that the performance of the screw pump with equal-wall-thickness stator is superior. At present, Canada Weatherford Company has developed a screw pump with equal-wall-thickness stator. The equal-wall-thickness stator means that the rubber layer of the stator has the same wall thickness, such as figure 1 As shown, it consists of two layers: a steel pipe layer 1 with a spiral inner cavity and a rubber layer 2 with equal wall thickness. The production process is to process the steel p...

AI Technical Summary

Problems solved by technology

The production process is to process the steel pipe with the helical inner cavity by casting or milling, and then press rubber into the gap between the lining core and the steel pipe, but the sand core with the helical surface needs to be made when casting is used. The machining accuracy of this process is not high, the process equipment is expensive, and the length of the stator is limited, generally less than 2m, and the production cost is very high

If the milling process is adopted, a special screw milling machine and internal helical surface processing CAM software must be used. It is understood that the entire equipment costs nearly 10 million yuan, and the entire processing process system has low rigidity, and the processing length and processing accuracy are limited, so it cannot be popularized. application

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