Oscillating restrictor

Abstract

A reciprocating piston machine ( 1 ) with at least one inlet and/or outlet valve that has a strip, tongue or lamella shaped closing member ( 5 ). The opening movements ( 8 ) of the closing member ( 5 ) are limited through a stroke restrictor ( 6 ) assigned to each valve. The stroke restrictor ( 6 ) has or defines at least one ventilation hole ( 8 ) inside the contact area of the closing member ( 5 ). This ventilation hole ( 8 ) prevents the formation of air cushions ( 7 ) between the closing member ( 5 ) and the corresponding stroke restrictor ( 6 ) effectively. In the absence of the ventilation hole ( 8 ), the air cushion ( 7 ) can limit the opening movements of the closing member ( 5 ) prematurely, which in turn could lead to the generation of additional noise.

What is claimed is:  
     
         1 . A reciprocating piston machine ( 1 ) with at least one inlet and/or at least one outlet valve ( 3 ,  4 ) with a strip, tongue or lamella shaped closing member ( 5 ), a stroke restrictor corresponding to the valve ( 3 ,  4 ) to limit opening movements of the closing member ( 5 ), wherein the stroke restrictor ( 6 ) includes or defines at least one ventilation hole ( 8 ) in a contact region of the closing member ( 5 ).  
     
     
         2 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein an external outline of the stroke restrictor ( 6 ) is complementing to an external outline of the closing member ( 5 ).  
     
     
         3 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein the stroke restrictor ( 6 ) and the closing member ( 5 ) have strip or tongue shape.  
     
     
         4 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein the stroke restrictor ( 6 ) has at least one ventilation hole ( 8 ), with a point-shaped or circular cross section.  
     
     
         5 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein the stroke restrictor ( 6 ) has at least one ventilation hole ( 8 ) with a longitudinally extended hole cross section aligned lengthwise or crosswise to the stroke restrictor ( 6 ).  
     
     
         6 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein the stroke restrictor has a plurality of ventilation holes ( 8 ) having axes which are parallel to one another, and the ventilation holes ( 8 ) have a longitudinally extended opening cross 'section that extends crosswise to the stroke restrictor ( 6 ).  
     
     
         7 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein the reciprocating piston machine ( 1 ) is a compressor.  
     
     
         8 . A reciprocating piston machine ( 1 ) according to  claim 1 , wherein the reciprocating piston machine ( 1 ) is a membrane pump.