Numerical-control water hydraulic variable piston pump

Abstract

The invention provides a numerical-control water hydraulic variable piston pump. The numerical-control water hydraulic variable piston pump comprises a rear end cover (1), a valve plate (2), a rotary cylinder body assembly (3), a shell (4), a water hydraulic electro-hydraulic proportional valve (5), piston shoe assemblies (6), a set plate (7), a variable swash plate (8), a connecting rod (9), a swash plate lining (11), a variable spring (12), a variable piston (13), a front end cover (14) and a shaft (16), wherein the number of the piston shoe assemblies (6) is an odd number. The swash plate angle change of the pump is controlled through the interaction of the water hydraulic electro-hydraulic proportional valve, the variable piston and the variable swash plate, and displacement control of the water hydraulic pump is achieved. According to the numerical-control water hydraulic variable piston pump, a pin is matched with a groove in the spherical surface of the variable swash plate so that the lateral force generated in the process that rotating friction of the piston shoe assemblies drive the variable swash plate to rotate can be effectively reduced or eliminated, and the lateral impact on a variable mechanism composed of the connecting rod and the variable piston can be reduced, so that the service life of the variable mechanism is greatly prolonged, and the reliability of the variable mechanism is greatly improved.

Description

technical field [0001] The invention relates to the technical field of displacement pumps, in particular to a digitally controlled water hydraulic variable displacement plunger pump. Background technique [0002] In recent years, breakthroughs have been made in water hydraulic transmission and control technology that directly uses water (filtered natural water, including seawater and fresh water) instead of mineral oil as the working medium, and in a wide range of engineering applications, compared with traditional oil Hydraulic transmission has proved to have outstanding advantages such as environmental protection, cleanliness, high efficiency, convenient use and maintenance, and low operating cost. Water hydraulic transmission and control technology has been widely used in high-pressure water atomization, seawater desalination, high-pressure water cleaning, stage drive and control, submersible buoyancy adjustment system, marine engineering and other transmission and contro...

AI Technical Summary

Problems solved by technology

Its principle is similar to the working principle of the valve-distribution plunger pump, but when the hydraulic cylinder is used instead of the plunger pump plunger as the suction and drainage working element, the working frequency of the reciprocating motion of the water cylinder is much lower than that of the column due to the low movement speed of the water cylinder. The working frequency of the plug pump leads to the prominent shortcomings of the pump such as large pressure pulsation, which greatly limits the application of the variable pump system in which the pressure signal is used as the feedback signal of the closed-loop control

[0006] With the wide application of water hydraulic transmission and control technology in food, fire protection, iron and steel, metallurgy, coal mine, chemical industry, injection molding, marine engineering, medicine, food, packaging, environmental protection, water treatment and other fields, general water hydraulic quantitative pump and water hydraulic control The valve control method is far from meeting the increasingly high transmission and control requirements in terms of power adjustment, energy saving, efficiency improvement, control accuracy improvement, and digital control.

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