Fully water-lubricated valve distribution plunger pump

Abstract

The invention discloses a fully water-lubricated valve distribution plunger pump which comprises a pump main body, a rotary unit, a supporting unit and a plunger distribution unit, wherein the pump main body comprises a cavity, and a water inlet and a water outlet which are communicated with the cavity; the rotary unit comprises a rotation spindle one end of which is arranged in the cavity of the pump main body; the supporting unit consists of an axial supporting unit and a radial supporting unit; the plunger distribution unit consists of a distribution valve assembly and a plunger shoe assembly, the plunger shoe assembly does periodic movement under the rotation of the rotation spindle, thus driving the on and off of valves in the distribution valve assembly, and leading a fluid to flow into the cavity from the water inlet or a fluid in the cavity to be discharged from the water outlet so as to realize flow distribution; a helical groove is arranged on the peripheral surface where the rotation spindle and the radial supporting unit are matched, and the pumping action of the helical groove leads the fluid to circularly flow in the cavity at two end surfaces of the rotation spindle. The fully water-lubricated valve distribution plunger pump fully utilizes the spaces of the shell and the spindle, and the radial sliding bearing design greatly improves the bearing capability of the spindle, and extends the service life of the hydraulic pump.

Description

technical field [0001] The invention relates to the technical field of displacement hydraulic pumps, in particular to a valve-distribution plunger hydraulic pump. Background technique [0002] With the emergence of the world's energy crisis and the improvement of people's awareness of environmental protection, as well as the special physical and chemical characteristics of the water medium itself, water hydraulic technology has advantages that oil pressure systems cannot match in many fields (such as underwater operations, rescue and fire fighting, food processing, etc.) The advantages of water hydraulic technology have gained great attention and developed rapidly. [0003] The water hydraulic pump is the key power component in the water hydraulic system and the heart of the water hydraulic system. Its performance directly determines the performance of the entire water hydraulic system. At present, the water hydraulic plunger pumps with valve distribution in the world mainl...

AI Technical Summary

Problems solved by technology

This structure is developed on the basis of the first structure. The main friction pair is directly lubricated by water. However, due to structural limitations, the force condition is relatively bad, the lubrication condition is relatively poor, the friction pair wears seriously, and the life of the pump is shortened. less than guaranteed

For example, in the hydraulic pump disclosed in the patent document CN1434209A, the main shaft is a through-shaft structure, and the sliding support bearings at both ends of the main shaft are limited by the structure, so it is difficult to increase the size and the radial bearing capacity, which limits the increase of the inclination angle of the swash plate. Large (the swash plate inclination angle of the pump is only 10°, while the swash plate inclination angle of the general swash plate axial piston pump reaches more than 15°), which further limits the increase of the power density of the pump

The hydraulic pump disclosed in the patent document CN101949374A adopts a structural mode in which the swash plate is stationary and the cylinder body rotates. This solution solves the problem of dynamic imbalance of the swash plate, but due to the unbalanced state of the flow distribution valve and plunger movement in the cylinder body, the cylinder There is a serious dynamic unbalance problem in the body, and it adds three pairs of friction pairs, especially the friction pair of the thrust sliding bearing of the cylinder block, which reduces the reliability of the hydraulic pump, and the radial arrangement of the distribution valve increases the The radial size of the hydraulic pump increases the volume and mass of the hydraulic pump

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