Equal-flow area conical screw-sleeve pair

Abstract

The invention discloses an equal-flow area conical screw-sleeve pair, which belongs to the application field of single-screw pumps. A conical sleeve comprises an inner curved conical sleeve surface, a big conical sleeve end surface, a small conical sleeve end surface, and an outer cylindrical conical sleeve surface; a big conical screw end surface and the big conical sleeve end surface compose an inlet end of the conical screw-sleeve pair; and a small conical screw end surface and the small conical sleeve end surface compose an outlet end of the conical screw-sleeve pair. The flow area of one section of the conical screw-sleeve pair is defined as a difference between the area of the inner curved conical sleeve surface and the area of an outer curved conical screw surface in the section. The equal-flow area characteristic and equal-cavity characteristic of the conical screw-sleeve pair can help increase the displacement of a single-head conical screw pump and reduce pressure fluctuation, so that flow is smoother; moreover, pressure rise from the inlet end to the outlet end is relatively small, relative sliding speed is low in the process of movement, consequently, abrasion is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the application field of single-screw pumps, in particular to a method for forming a curved surface of a tapered screw-bush pair, capable of transporting very viscous media, all media containing water, media containing gas, and media containing fibers and solid particles. Medium, etc., can be used in petroleum, chemical, pharmaceutical and other fields. Background technique [0002] The traditional cone-screw-sleeve pairs widely used in single-head cone-screw pumps are mostly cavity-reducing structures. Rotating, the working medium is continuously conveyed from the inlet end of the conical screw-bush pair to the outlet end. There are many defects and problems in some existing tapered screw rod-bush pairs. In the patent document CN 103883522 A and the patent document CN 103775334 A, the flow area of ​​each cross-section of the proposed conical screw bush pair from the inlet end to the outlet end is continuously reduced, and th...

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Problems solved by technology

In the patent document CN 103883522 A and the patent document CN 103775334 A, the flow area of ​​each cross-section of the proposed conical screw bush pair from the inlet end to the outlet end is continuously reduced, and the volume of each cavity is rapidly reduced accordingly, resulting in The displacement of the pump is small, the pressure pulsation between the chambers is large, and the flow is not stable, which seriously affects the normal operation and service life of the pump.

In the patent document WO 2010100134 A2, a conical screw bushing pair with equal volumes is proposed. The volume of each cavity is equal. The realization method is through the combination of a series of parameters such as eccentricity and rotor diameter. The volume of each cavity is made equal, but the flow area of ​​each cross-section from the inlet end to the outlet end of this conical screw bushing pair is not constant, which increases the flow instability. At the same time, the patent does not give There is no way to process and manufacture the specific surface equations of the cone-screw and the cone-shaped bushing, which affects the promotion and use of the cone-screw pump

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