A cp type single screw pump

Abstract

The invention discloses a CP type single-screw pump, which is applied to single-phase liquid conveyance or gas-liquid two-phase mixed conveyance. Particularly, when a pump performs positive rotation, and the gas-liquid two-phase flow is conveyed in a mixed way, the inner compression on gas-phase media can be automatically realized. The CP type single-screw pump is characterized in that a first through hole is formed at the back part of a screw rod and between a region with the screw groove depth approaching to 0 and the back part end surface of the screw rod; a valve assembly used for controlling the fluid suck-in or discharge-out process is arranged in the first through hole; a through hole with the completely identical position and shape as the first through hole is formed in a way of being corresponding to each screw groove; a valve assembly identical to the valve assembly is arranged in each through hole. The invention provides a key technology for developing CP type single-screw machinery to a pump field. The CP type single-screw pump has the advantages that the structure is simple; the lift head is high; the efficiency is high; the self suction capability is high, and the like. The CP type single-screw pump can be used in the fields of urban water supply, irrigation, oil-gas mixed conveyance and the like.

Description

Technical field: [0001] The invention relates to a pump, in particular to a CP type single screw pump. Background technique: [0002] The screw pump is a rotary pump that relies on the volume change and movement of the meshing space formed by the pump body and the screw to transport or pressurize the fluid medium. The screw pump has the characteristics of small size, high efficiency and high lift, and has self-priming function. It is a constant flow pump, and the flow rate is proportional to the speed. Screw pumps include single screw pumps, twin screw pumps, triple screw pumps, etc. A single screw pump usually refers to a positive displacement pump in which a single screw rotates in an internal thread groove of the pump body to drive a fluid medium. In the existing literature (patent number: WO82 / 03428), the CP single-screw machine widely used in the field of compressors is applied to the field of pumps, and a CP-type single-screw pump is proposed. Conveying fluid media....

AI Technical Summary

Problems solved by technology

When rotating forward, if the triangular orifice on the CP single-screw compressor is still used as the discharge orifice of the CP single-screw pump, when the screw groove is closed, there is still a long section between the working chamber and the orifice in the circumferential direction of the cylinder. Due to the incompressibility of the liquid, the liquid trapped in the working chamber cannot be discharged, and the phenomenon of trapped liquid will occur, and the function of conveying the fluid medium cannot be realized

When reversing, if the triangular orifice on the CP single-screw compressor is still used as the suction orifice of the CP single-screw pump, when the screw groove turns over the triangular orifice, no fluid medium will enter the working chamber. However, the direction of movement of the star gear teeth further increases the working chamber. Since the liquid cannot expand, the phenomenon of trapped liquid will also occur, and the function of conveying fluid medium cannot be realized.

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