Reciprocating piston engine

Abstract

A reciprocating piston machine is provided having at least one membrane ( 1 ) produced from an elastomeric material and an oscillating reciprocating drive that acts on a center zone ( 3 ) of the membrane ( 1 ). Between the center zone ( 3 ) of the membrane and its circumferential edge zone ( 5 ), a deformable membrane zone (M) is provided that is deformed during the oscillating pumping movements. The reciprocating piston machine according to the invention is characterized in that the work and/or auxiliary membrane ( 1 ), in its deformable membrane zone, is provided with at least two cantilever-type annular zones ( 7, 8 ) that merge into each other in a reduction of cross-section ( 9 ) of the membrane ( 1 ) and in that the membrane cross-section, starting from the reduction of cross-section ( 9 ), enlarges in the annular zones ( 7, 8 ). The membrane of the reciprocating piston engine according to the invention is very durable and functions with little noise.

1 . A reciprocating piston machine comprising at least one working membrane ( 1 ) and/or at least one auxiliary membrane made from an elastomeric material and having an oscillating drive, engaging the membrane ( 1 ) in a central area ( 3 ), with a deformable membrane area (M) being provided between the central area ( 3 ) of the membrane ( 1 ) and a circumferential edge area ( 5 ) clamped in the reciprocating piston machine and deforming during the oscillating pumping movement, wherein a different geometrical configuration of the working membrane and/or the auxiliary membrane ( 1 ), caused by the drive, to mounting points provided in the central area and at the circumferential edge area is developed by two merging curves, which define a shape of the membrane.  
   
   
       2 . A reciprocating piston machine according to  claim 1 , wherein a membrane cross-section of the working membrane and/or auxiliary membrane is sized in the deformable membrane area (M), such that during pumping movement almost identical tension and/or elastic deformations develop in an upper surface membrane zone of the deformable membrane area (M).  
   
   
       3 . A reciprocating piston machine according to  claim 1 , wherein the working membrane and/or auxiliary membrane has at least two cantilever-shaped annular areas ( 7 ,  8 ) in the deformable membrane area (M), merging in a cross-sectional reduction ( 9 ) of the membrane ( 1 ), and the cross-section of the membrane, starting from the cross-sectional reduction, enlarges in each of the annular areas ( 7 ,  8 ).  
   
   
       4 . A reciprocating piston machine according to  claim 3 , wherein the cross-section of the membrane at least partially enlarges linearly in the annular areas ( 7 ,  8 ).  
   
   
       5 . A reciprocating piston machine according to  claim 3 , wherein the cross-sectional reduction ( 9 ) ranges from 0.6 to 0.8 in reference to a diameter of the deformable membrane area (M).  
   
   
       6 . A reciprocating piston machine according to  claim 1 , wherein the reciprocating piston machine comprises a membrane pump.  
   
   
       7 . A reciprocating piston machine according to  claim 1 , wherein the working membrane of the membrane pump is a molded membrane or a flat membrane.  
   
   
       8 . A working membrane or auxiliary membrane for a reciprocating piston machine, which is designed according to  claim 1.