Hydraulic pressure intensifier

Abstract

The invention relates to a hydroelectric pressure intensifier in which the plunger piston ( 8 ) and/or the driving spindle ( 9 ) of said plunger piston and/or the piston rod ( 3 ) of the working piston ( 2 ) are driven by electrical means, especially electromotors such as linear motors ( 11 ).

1 . Hydraulic pressure intensifier 
 with a working area ( 4 ) arranged in an aggregate housing ( 1 ) for changing pressures, i.e. a low storage pressure for a rapid traverse advance and a return stroke as well as a high working pressure for a working stroke,    with a working piston ( 2 ), limiting the working area ( 4 ) at the front side and actuated by the working pressure in the working housing ( 1 ) for the working stroke; said working piston is guided by a piston rod ( 3 ) to the outside of the housing ( 1 ),    with a storage volume ( 5 ), hydraulically connected with the working area ( 4 ), arranged in a cylindrical space of the housing ( 1 ); hydraulic oil under storage pressure flows out of said storage volume during rapid traverse into the working area ( 4 ) and flows back again with the return stroke,    with a plunger piston ( 8 ) that can be actuated as high pressure generator and is immersing into the working area ( 4 ) after rapid traverse, exhibiting a driving spindle ( 9 ),    with a drive unit of the plunger piston ( 8 ) on the opposite side of the working area ( 4 ) for rapid traverse and also for the working stroke for the generation of the high working pressure 
 characterized by the fact,  
 that the plunger piston ( 8 ), respectively the driving spindle ( 9 ) is driven at least for the working stroke by electrical working means ( 11 ,  18 ,  22 ,  23 ).  
   
     
     
         2 . Pressure intensifier according to  claim 1 , characterized by the fact that an electric motor ( 11 ,  18 ,  22 ) serves as driving means.  
     
     
         3 . Pressure intensifier according to  claim 2 , characterized by the fact that a ball spindle motor or such serves as electrical driving means.  
     
     
         4 . Pressure intensifier according to  claim 2 , characterized by the fact that the electric motor is designed as linear motor ( 11 ), with which the plunger is at least indirectly connected with the plunger piston ( 8 ) and/or the piston rod ( 3 ) of the working piston ( 2 )  
     
     
         5 . Pressure intensifier according to one of the preceding claims, characterized by the fact that the rapid traverse stroke lying before the working stroke and/or the return stroke lying behind the working stroke are caused at least partially hydraulically.  
     
     
         6 . Pressure intensifier according to one of the preceding claims, characterized by the fact that an annular area ( 16 ) for hydraulic control, in particular for the return stroke is present within the housing ( 1 ) and around the piston rod ( 3 ), as well as limited by the working piston ( 2 ).  
     
     
         7 . Pressure intensifier according to  claim 6 , characterized by the fact that a hydraulic connection ( 15 ) consists between annular area ( 16 ) and storage volume ( 5 ).  
     
     
         8 . Pressure intensifier according to  claim 7 , characterized by the fact that around the driving spindle ( 9 ) an annular piston ( 12 ) is axially movable arranged, which is sealed towards the driving spindle and to the housing ( 1 ); said annular piston limits a compensation area ( 14 ), which is filled with hydraulic fluid, towards the storage piston ( 7 ) and is loaded by a spring ( 13 ) determining the hydraulic low pressure on the side opposite to the storage piston ( 7 ), and is connected with the hydraulic connection ( 15 ).  
     
     
         9 . Pressure intensifier according to  claim 8  or  9 , characterized by the fact that a control valve ( 17 ) is arranged in each case in the hydraulic connection between the storage volume ( 5 ) and the annular area ( 16 ), respectively the compensation area ( 14 ), which as one-way valve blocks in the flow direction out of the annular area ( 16 ) or the storage volume ( 5 ), however throttles in the flow direction to these areas.  
     
     
         10 . Pressure intensifier according to one of the  claims 4  to  10 , characterized by the fact that the driving spindle ( 9 ) respectively the piston rod ( 3 ) can be driven by a linear motor.