ES348994A2 - Compression pump for hydraulic circuits. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improvements in the object of the main patent no. 337.962, by "compression pump for hydraulic circuits", characterized in that when to obtain the automatic reduction of the area of effective compression of the piston, the complementary possibilities of an internal axial conduit attached to the bottom of the chamber of compression of the pump and linked to the hydraulic circuit, with an axial cavity of the said piston, in which that duct is permanently located, the evacuation is controlled with the aid of the conventional unidirectional valve device, substantially of seat flat, from the excess of fluid to the feeding vessel, through a passage of limited section to achieve the substantial characteristic of coming to limit, by the forced circulation of the fluid through the above-mentioned passage of limited section, the flow of fluid that can be evacuated per unit of time towards the vessel, so that, in the event that the displacement of the piston is fast, that step to the being of limited section is insufficient to evacuate towards the vessel, the volume of fluid displaced by the greater effective oppressive surface of the piston, with which the fluid goes to fill more quickly the remaining hydraulic circuit and consequently the smaller oppressive surface of the piston also begins to act more quickly, whose filling time and elapsed time between the start of the first working phase and the instant in which the second phase begins, decrease proportionally to the increase in the speed of displacement of the piston. Plunger. (Machine-translation by Google Translate, not legally binding)