Pumpe mit verstellbarem Fördervolumen

摘要

Disclosed is a pump having adjustable conveying volumes, in particular a vane, roller-cell or pendulum-slide pump, comprising a rotation assembly, a lifting ring and a rotationally driven rotor with extendable and retractable vanes, rollers or pendulum sliders that are guided in slots. The vanes, rollers or pendulum sliders form adjustable conveying cells in conjunction with the rotor and the lifting ring, the lifting volume remaining constant during rotation in a centric position of the lifting ring relative to the rotor, yet varying in an eccentric position of the lifting ring towards to the rotor such that the cell volume increases in the suction region of the pump and decreases in the pressure region of the pump, a separation region of at least one cell width being arranged between the suction region of the pump and the pressure region of the pump in order to prevent a short-circuit between the two regions when the cells are switched between the suction region and the pressure region, the pump further having lateral walls or lateral housing walls, which axially seal the rotation assembly, the lateral walls or lateral housing walls having a suction opening (suction kidney) in the suction region and a pressure-side opening (pressure kidney) in the pressure region on at least one side, the pressure kidney optionally having a damping notch extending in peripheral direction towards the separation region, further having an displacement device for displacing the lifting ring, the displacement device having at least one effective pressure surface of a pressure control chamber for exerting a displacement force on the lifting ring and an additional second effective pressure surface of a compensation chamber, which exerts a counter force or compensation force on the lifting ring, further having a regulating/control device, such as a valve, which can vary the pressure on one of the effective pressure areas between high pressure and suction pressure of the pump, and optionally having a spring, which displaces the lifting ring into the fully eccentric position (full lift of the pump during start-up) in the non-pressurised state of the pump. The pump is characterised in that the additional second effective pressure area of the compensation chamber is connected via at least one connection to the region inside the pump, which region extends from the beginning of the separation region of the pump, i.e. from the end of the suction region, to the end of the damping notch, i.e. from the beginning of the pressure region or the pressure kidney, in peripheral direction inside the rotation assembly, i.e. in the switching region of the pump between suction region and pressure region and/or the damping notch.