Delivery device for discharging a fluid to a fluid line

Abstract

A delivery device, with a delivery piston ( 27 ) which is movable in a pump chamber ( 31 ) by means of an actuation device ( 3 ) and which, in one delivery direction, removes fluid from a fluid line ( 35 ) in a pressure-reducing manner and, in a further and preferably opposite delivery direction, discharges fluid into a further fluid line ( 37 ) in a pressure-increasing manner, is characterized in that a valve device ( 39, 41 ) is introduced into the respective fluid line ( 35, 37 ), each with an opposite mode of action, in such a way that, in the pressure-reducing removal process, the respective valve device ( 39, 41 ) opens in one fluid line ( 35 ) and closes in the further fluid line ( 37 ) and, in the reverse case, in the pressure-increasing discharging process, the respective valve device ( 39, 41 ) closes in one fluid line ( 35 ) and opens in the further fluid line ( 37 ).

1 . A delivery device, having a delivery piston ( 27 ) displaceable in a pump chamber ( 31 ) by means of an actuation device ( 3 ), which in one delivery direction removes fluid from a fluid line ( 35 ) in a pressure-reducing manner and, in another, preferably opposite delivery direction, discharges fluid into another fluid line ( 37 ) in a pressure-increasing manner, characterized in that a valve device ( 39 ,  41 ) is introduced in the respective fluid line ( 35 ,  37 ) with an opposite mode of action in such a way that the respective valve device ( 39 ,  41 ) in the one fluid line ( 35 ) opens during the pressure-reducing removal process and closes in the other fluid line ( 37 ) and, in the opposite case, the respective valve device ( 39 ,  41 ) in the one fluid line ( 35 ) closes during the pressure-increasing discharge process and opens in the other fluid line  37 . 
     
     
         2 . The delivery device according to  claim 1 , characterized in that the respective valve device is formed by check valves ( 39 ,  41 ), the opening directions of which together point in an intended fluid delivery direction in the allocated fluid line ( 35 ,  37 ). 
     
     
         3 . The delivery device according to  claim 1 , characterized in that the respective fluid lines ( 35 ,  37 ), calculated from the pump chamber ( 31 ) to the respective check valves ( 39 ,  41 ) allocatable to said fluid lines, have one and the same line segment ( 43 ,  45 ) with the same flow-through cross section. 
     
     
         4 . The delivery device according to  claim 1 , characterized in that the free cross section of the pump chamber ( 31 ) is the same as or smaller than the free cross section of the respectively connected line segments ( 43 ,  45 ), relative to this connection area. 
     
     
         5 . The delivery device according to  claim 1 , characterized in that the respective fluid line ( 35 ,  37 ,  43 ,  45 ) is a component of a collective fluid delivery line system ( 43 ,  45 ), into which the pump chamber ( 31 ) with its integrated delivery piston ( 27 ) is connected. 
     
     
         6 . The delivery device according to  claim 1 , characterized in that a needle-like extension ( 29 ) of the delivery piston ( 27 ) engages in the pump chamber ( 31 ), into the free end of which the respective fluid lines ( 43 ,  45 ) open. 
     
     
         7 . The delivery device according to  claim 1 , characterized in that the actuation device is formed by an energizable actuating magnet ( 3 ), which, in its one currentless or its other energizable actuating state, moves the delivery piston ( 27 ) into its pressure-reducing or pressure-increasing displaced position. 
     
     
         8 . The delivery device according to  claim 1 , characterized in that the piston delivery pump, consisting of at least the delivery piston ( 27 ) and the pump chamber ( 31 ), is provided with a pressure limiting device ( 33 ) in such a way that, in the event of an undesired pressure increase in the fluid delivery line system ( 43 ,  45 ), the pressure inside the pump chamber ( 31 ) is limited to a predefinable maximum pressure value. 
     
     
         9 . The delivery device according to  claim 1 , characterized in that in order to form the pressure limiting device, the delivery piston ( 27 ), assisted by an energy storage device, in particular in the form of a compression spring ( 33 ), can be moved into a resetting area, which expands the holding volume of the pump chamber ( 31 ) when the corresponding fluid pressure is present in the fluid delivery line system ( 43 ,  45 ). 
     
     
         10 . The delivery device according to  claim 1 , characterized in that a further energy storage device, in particular in the form of another compression spring ( 25 ), permanently acts on the delivery piston ( 27 ), which compression spring seeks to move the delivery piston ( 27 ) into a delivery area that reduces the volume of the pump chamber ( 31 ).