A flow balance device for piston pump

Abstract

The invention belongs to the field of a piston, and particularly relates to a flow balancing device for a piston pump. The flow balancing device comprises a pump body and a piston arranged in the pump body, wherein one end of a main piston rod is fixedly connected with the piston, the other end of the main piston rod extends out of the outer side of the pump body, the inside of the pump body is divided into two pump cavities by the piston, the two pump cavities are respectively communicated with a corresponding liquid inlet pipe and a corresponding liquid discharge pipe, the flow balancing device comprises a balancing piston rod, one end of the balancing piston rod is fixedly arranged at one side, deviating from the main piston rod, of the piston, the other end of the balancing piston rod extends out of the outer side of the pump body and forms sliding fit with a hydraulic buffer mechanism, and an axial line of the balancing piston rod is parallel to or coincident with an axial line of the main piston rod. Compared with the piston pump in the prior art, the flow balancing device has the advantages that the return speed of the piston is more uniform, the flow is more stable, the pulsation is more balanced, and the reliability and the stability of the work of the piston pump are improved.

Description

technical field [0001] The invention belongs to the field of piston pumps, and in particular relates to a flow balance device for piston pumps. Background technique [0002] Piston pumps are widely used in petrochemical, coal chemical and oil fields. The structure of the double-acting piston pump in the prior art is as follows: figure 1 As shown, it includes a pump body 10 and a piston 30 arranged in the pump body 10, one end of the main piston rod 20 is affixed to the piston 30, and the other end of the main piston rod 20 stretches out from the outside of the pump body 10; the piston 30 The inside of the pump body 10 is divided into two pump chambers, and the two pump chambers are respectively connected with corresponding liquid inlet pipes and liquid discharge pipes. Because the cylinder volume difference formed by the volume of the main piston rod 20 always exists in the two pump chambers of the piston pump in the above structure, when the volume of the main piston rod ...

AI Technical Summary

Problems solved by technology

Because the cylinder volume difference formed by the volume of the main piston rod 20 always exists in the two pump chambers of the piston pump in the above structure, when the volume of the main piston rod 20 is large, the cylinder volume difference can reach more than 20%. Acting piston pumps always have disadvantages such as unstable flow and large pulsation. The pump body and its components will continue to bear the impact of fluctuations and instability caused by large flow differences, so the piston pump is prone to failure and shortens its service life.

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