Piston pump

摘要

A hand-operated piston pump includes a drive shaft and a rotor mounted in a housing case, the rotor having axial compression chambers, a piston biased by an elastic member sliding in each compression chamber and having a projecting end that engages a cam track; a fluid reservoir in the housing case; a valve plate downstream of the rotor having conduits for a pressurized fluid that communicate with conduits in walls of the compression chambers, the valve plate being non-rotatably mounted below the housing case and communicating with conduits that carry the pressurized fluid to and from a consuming unit through an interposed check valve inserted in a corresponding valve body, the valve body having an upper flange with fluid supply and return channels communicating with the fluid conduits of the valve plate. The valve plate floats relative to the upper flange and is separated therefrom by a separating member.

主权项

1. A hand-operated piston pump, particularly for directional control of watercrafts, or boats, said pump comprising:
a drive shaft (3), which is rotatably mounted in a housing case (1); a rotor (4), which is mounted in the housing case (1) and is rotationally integral with the drive shaft (3), said rotor (4) having a plurality of axial compression chambers (104) formed in a body of said rotor (4), said axial compression chambers (104) surrounding the drive shaft (3); a piston (304) axially and slidably housed in each compression chamber (104) and biased by an elastic member, the piston having one end projecting out of one end side of a corresponding compression chamber (104) against a cam track (8) comprising an annular plate inclined with respect to an axis of rotation of the rotor (4); a fluid reservoir in said housing case (1); and a valve plate (6) located downstream from the rotor (4) and having at least two separate fluid passage conduits (106, 306) for passage of a pressurized fluid, the at least two separate conduits (106, 306) alternately communicating with conduits (204) for drawing or discharging the pressurized fluid, the latter conduits being provided in bottom delimiting walls of the compression chambers (104) facing toward the valve plate (6), wherein the valve plate (6) is non-rotatably mounted below the housing case (1) and communicates with conduits for supplying and returning the pressurized fluid to a consuming unit through an interposed check valve (28) inserted in a corresponding valve body (27), said valve body (27) having an upper flange (271), said upper flange having fluid supply and return channels communicating with said fluid passage conduits (106, 306) of said valve plate, and wherein said valve plate (6) is disposed to float relative to said upper flange (271), sealing members being interposed between said valve plate (6) and said upper flange (271) to cause said valve plate (6) to be separate from said upper flange (271).