A plunger type digital pump

Abstract

A plunger type digital pump mainly comprises a flow distribution end cover, a shell, low-pressure valve bodies, high-pressure valve bodies, a cylinder body, a roller plunger, flow distribution slide ways, sleeves, an output shaft, bearings and an end cover, wherein the cylinder body is formed by stacking five parts, the roller plunger is arranged in a fifth cylinder body, plunger cavities are divided into oil suction channels and oil pressing channels by a fourth cylinder body, a second cylinder body is embedded in a first cylinder body and a third cylinder body, the low-pressure valve bodiesand the high-pressure valve bodies are uniformly arranged at intervals in the circumferential directions of the first cylinder body, the second cylinder body and the third cylinder body, and valve core controllers are uniformly arranged at intervals in the circumferential direction of the second cylinder body; the first flow distribution slide way, the second flow distribution slide way and the third flow distribution slide way are mounted and fixed to the output shaft, a first rectification valve seat and a high-speed valve core are embedded in each low-pressure valve body, closing control can be carried out through electric signals, and a second rectification valve seat and a valve core are embedded in each high-pressure valve body; and by adjusting the working state and sequence of thevalve cores in each low-pressure valve body, discrete control on the flow can be realized, and then variable control on the output flow of a plunger pump can be realized.

Description

technical field [0001] The invention relates to an axial plunger hydraulic pump, in particular to an axial plunger digital hydraulic pump. Background technique [0002] Piston pumps are widely used in the hydraulic field. In order to realize the adjustment of the output displacement, variable mechanisms are added on the basis of quantitative plunger pumps. These variable mechanisms are mainly swash plate mechanisms. Due to the complexity of variable mechanisms and poor reliability, As a result, the weight and volume per unit power are relatively large. At present, a lot of research has been done on the displacement adjustment of plunger pumps, mainly based on incremental digital control. For example, the digital pump with the authorized announcement number CN201510658229. The valve realizes displacement pulse width modulation. This structure has the following disadvantages. The plunger is radially installed, and the number of high-speed switching valves is the same as that...

AI Technical Summary

Problems solved by technology

This structure has the following disadvantages. The plunger is radially installed, and the number of high-speed switching valves is the same as that of the plunger. Therefore, the structure is complex and not compact enough, and the overall size is large; the rated displacement range is small due to the size of the eccentric sleeve. In terms of structure, the rated displacement can only be increased by increasing the number of plungers and high-speed switching valves; in addition, the control oil circuit becomes more complicated as the number of plungers increases, resulting in serious throttling loss and reduced mechanical efficiency

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