A shaft-valve composite flow distribution method for a water hydraulic plunger pump

Abstract

The invention belongs to the field of plunger pump flow distribution, and specifically discloses a composite flow distribution method for a shaft valve of a hydraulic plunger pump. The hydraulic plunger pump comprises an annular shell, a rotary eccentric shaft, a plurality of plunger sliding shoe assemblies and a plurality of extruding flow distribution valve assemblies, the rotary eccentric shaftis coaxially arranged with the annular shell, the plurality of plunger sliding shoe assemblies are uniformly distributed in the circumferential direction of the rotary eccentric shaft and are installed on the annular shell, and the plurality of extruding flow distribution valve assemblies are in one-to-one correspondence with the plunger sliding shoe assemblies; the plunger sliding shoe assemblies perform reciprocating motion in the radial direction of the annular shell during the rotating process of the rotary eccentric shaft, and the plunger sliding shoe assemblies are always attached to the outer surface of the rotary eccentric shaft and are in communication with a flow distribution groove on the rotary eccentric shaft; when the plunger sliding shoe assemblies move towards the direction close to the rotary eccentric shaft, the plunger sliding shoe assemblies are in communication with the flow distribution groove to realize water absorption; when the plunger sliding shoe assembliesmove in the direction away from the rotary eccentric shaft, the plunger sliding shoe assemblies are not in communication with the flow distribution groove; and water drainage is realized by the extruding flow distribution valve assemblies, so that the composite flow distribution of the shaft valve of the hydraulic plunger pump is realized.

Description

technical field [0001] The invention belongs to the field of flow distribution of plunger pumps, and more specifically relates to a method for compound flow distribution of a shaft valve of a water hydraulic plunger pump. Background technique [0002] The water hydraulic pump is the core power component of the water hydraulic system. The water hydraulic pumps currently developed mainly include gear pumps, vane pumps and plunger pumps. Compared with gear pumps and vane pumps, plunger pumps have higher pressure. And volumetric efficiency, so the plunger type water hydraulic pump is currently the most widely used. [0003] For plunger-type water hydraulic pumps, the flow distribution method has a great influence on the volumetric efficiency and performance of the pump. At present, there are two main flow distribution methods of water hydraulic pumps, one is the distribution valve distribution, and the other is the distribution plate distribution. Both methods have their own ad...

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Problems solved by technology

[0004] 1) For the plunger pump with distribution valve, the sealing performance of the valve is good, the output pressure of the plunger pump is high, and the anti-pollution ability of the distribution valve is strong, which reduces the pollution sensitivity of the plunger pump to the medium, but the valve distribution method is large Due to the large mass of the spool in the flow pump, the speed of the pump is not high, which greatly increases the volume and weight of the pump;

[0005] 2) For the distribution of the distribution plate, the pump has high speed, small size and light weight, but a pair of friction pairs are added to the distribution of the distribution plate, and the anti-pollution ability of the distribution of the distribution plate is poor, and the sealing performance is worse than that of the valve distribution, and the pressure of the pump is not high. high

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