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[CN 201680059787.6] Hydraulic machine and reversible metering pump equipped with the machine
[CN 201680059787.6] Hydraulic machine and reversible metering pump equipped with the machine Title: Hydraulic machine and reversible metering pump equipped with the machine Application number: CN 201680059787.6 Applicant: Doxatron International Company Application date: 2016-10-13 Patent type: Invention application The present invention relates to a hydraulic machine, which includes: a shell (14); a differential piston (1), it has an upper crown (23) and a lower base (27), the upper crown and the lower base are adapted to slide in alternating motion in the housing shell and in the column-shaped seat (22) inside the housing shell, respectively, the piston separating the two chambers (16, 17) of the housing shell; hydraulic switching means for the supply of liquid to and the discharge of fluid from said chamber separated by a piston, controlled by the displacement of said piston, and comprising at least one connecting rod (4) acting on a delivery member (12) comprising an upper valve (3) cooperating with a first seat (25) arranged in an upper crown (23) of said piston, and at least one lower valve (9) cooperating with a second seat (26) provided in a lower base (27) of the piston; and triggering means adapted to initiate, under the action of elastic means (E), an abrupt change in the position of the switching means at the end of the stroke of the piston to reverse the stroke. The upper and lower valve seats respectively accommodate an upper frustoconical portion (25a;26a) and a lower frustoconical portion (25c;26c) having opposite tapers. The invention also relates to a reversible dosing pump comprising such a hydraulic machine.
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