Rotary pump having a hydraulic intermediate capacity with first and second connections

A pump with a pump chamber and a rotary-driven pump element mounted therewithin, at least one suction connection and at least one pressure connection opening into the pump chamber and with circulating pumping cells whose volume can be changed, which are connected with the suction or pressure connection depending on the rotary position of the pump element, comprising:

• a hydraulic intermediate capacity having a first connection and a second connection, wherein the hydraulic intermediate capacity can be stressed by the pumping medium pressure by way of one of the first connection or the second connection being in fluid communication with the pressure connection while the other of said first connection or said second connection is in fluid communication with an adjacent pumping cell and is intermittently occluded by said rotary-driven pump element.

A pump having a pump chamber with a rotary-driven pump element for generating a pumping medium pressure, at least one suction connection and at least one pressure connection opening into the pump chamber and with circulating pumping cells whose volume can be changed, which are connected with the suction connection or pressure connection depending on the rotary position of the pump element, and each pumping cell being separated from an adjacent pumping cell by a vane, the pump further comprising:

• a hydraulic intermediate capacity having a first connection positioned in fluid communication with the pressure connection and a second connection positioned to be intermittently occluded by a vane separating adjacent pumping cells, depending on the rotary position of the pump element, wherein the hydraulic intermediate capacity can be stressed by the pumping medium pressure from the area of a first pumping cell via the first connection and while a second pumping cell adjacent said first pumping cell is either intermittently connected to the pressure of the pumping medium at the pressure connection via the second connection when the vane separating the pumping cells is not positioned to occlude the second connection or has no direct connection to the pressure connection when the vane is positioned during the rotation of the pump element to occlude the second connection.