Pneumatic blow-off silencer

Abstract

The present invention relates to a silencer for the damping of noises occurring in pneumatic pressure systems as a result of pressure blow-off flows from a pressure side to an atmosphere side. The silencer consists of a housing surrounding an expansion space, with a pressure-side inlet for the blow-off flow and with an opposite atmosphere-side outlet. A damping element consisting of a porous material through which a flow is capable of passing is arranged within the expansion space in the vicinity of the inlet. The damping element has a flow area through which a flow is capable of passing, which is larger than the inner cross-sectional area (A 1 ) of the expansion space.

1 . A silencer for the damping of noises occurring in pneumatic pressure systems as a result of pressure blow-off flow from a pressure side to an atmosphere side, the silencer comprising a housing having an interior defining an expansion space, the housing comprising a pressure-side inlet for the blow-off flow and with an opposite atmosphere-side outlet, a damping element arranged within the expansion space in the vicinity of the inlet and which consists of a porous material through which the blow-off flow is capable of passing.  
   
   
       2 . A silencer particularly according to  claim 1  wherein the damping element has a flow area effective for throughflow, which is larger than the inner cross-sectional area of the expansion space.  
   
   
       3 . A silencer according to  claim 2  wherein the damping element is designed as an elongate hollow body with an inflow orifice located on one side and connected to the pressure-side inlet and with a porous body wall having a bottom opposite the inflow orifice.  
   
   
       4 . A silencer according to  claim 3  wherein the body wall of the damping element is formed of a porous plastic, in particular from the group of polyolefins, preferably of a porous high-density polyethylene (HDPE).  
   
   
       5 . A silencer according to  claim 1  wherein an insulting material of a wadding or fibre material is arranged within the expansion space.  
   
   
       6 . A silencer according to  claim 5  wherein the insulating material is arranged in the region between the damping element and the atmosphere-side outlet.  
   
   
       7 . A silencer according to  claim 1  wherein the ratio of the inner cross section (A 1 ) of the expansion space to the cross sectional areas (A 2 ) of the atmosphere-side outlet is in the range of between 2:1 and at most 30:1, and preferably about 8:1.  
   
   
       8 . A silencer according to  claim 1  wherein the ratio of the inner cross section (A 1 ) of the expansion space to the cross sectional areas (A 2 ) of the pressure-side outlet is in the range of between 2:1 and at most 30:1, and preferably about 8:1.