High Pressure Double Membrane Pump and Membrane Element for Such a Pump

Abstract

A high pressure double membrane pump has a central housing ( 3 ), two cylindrical pump chambers ( 7,8 ), a coupling rod ( 4 ) which moves back and forth when the pump is in operation and which has a pump piston ( 9 ), two membranes which divide each of the pump chambers ( 7,8 ) into a product chamber ( 11,12 ) and a compressed air chamber ( 1,2 ) with changing volumes of which the membranes have a peripherally mounted membrane body ( 15 ). In the central area of the membrane body ( 15 ) a rigid implant body ( 17 ) is embedded which is equipped with a dog ( 18 ) which is connected to one end of the coupling rod ( 4 ), and a pneumatic control unit for the alternating impinging of compressed air upon the compressed air chambers. In the area of the compressed air chambers ( 1,2 ) a rigid supporting ring ( 20 ) is pushed onto the dog ( 18 ) between the end of the coupling rod ( 4 ) and the inner side of the membrane ( 5 ). The diameter of said supporting ring is between 50% and 95% of the diameter of the working surface of the membrane ( 5 ), and the periphery thereof is formed as a rounded shoulder ( 21 ) facing away from the membrane body ( 15 ).

1 - 21 . (canceled) 
     
     
         22 . A high pressure double membrane pump, equipped with:
 a central housing ( 3 );   two cylindrical pump chambers ( 7 ,  8 );   a coupling rod ( 4 ) which moves back and forth during pumping operations having a pump piston ( 9 );   two membranes which divide each of the pump chambers ( 7 ,  8 ) into a product chamber ( 11 ,  12 ) and a compressed air chamber ( 1 ,  2 ), provided with dividing membranes ( 5 ,  6 ) changing volumes, having a peripherally mounted elastomer membrane body ( 15 ), wherein a rigid implant body ( 17 ) is embedded in the central region of the membrane body which is provided with a dog ( 18 ) which is connected with one end of the coupling rod ( 4 ); and   a pneumatic control unit for alternating impinging of compressed air upon the pressure chambers,   characterized in that to maintain the functioning of the diaphragm pump above a pressure ratio of 1:3 of ambient pressure to product pressure in the area of the pressure pump chambers ( 1 ,  2 ), a rigid supporting disc is inserted between the end of the coupling rod  4  and the inner side of the membrane ( 5 ) onto the dog ( 18 ), having a diameter which corresponds to between 50% and 95% of the diameter of the working surface of the membrane,   wherein its periphery is formed as a rounded shoulder ( 21 ) which is facing away from the membrane body ( 15 ).   
     
     
         23 . The high pressure membrane pump according to  claim 22 , characterized in that during the operation, the pump is operated with a pressure ratio of the air pressure to product pressure in a range of 1:3 to 1:6. 
     
     
         24 . The high pressure membrane pump according to  claim 22 , characterized in that the diameter of the supporting disc ( 20 ) corresponds to between 70% and 85% of the diameter of the working surface of the membrane. 
     
     
         25 . The high pressure membrane pump according to  claim 24 , characterized in that the diameter of the supporting disc ( 20 ) is greater than the diameter of the implant body. 
     
     
         26 . The high pressure membrane pump according to  claim 25 , characterized in that the diameter of the supporting disc ( 20 ) corresponds to 150% to 210% of the diameter of the implant body. 
     
     
         27 . The high pressure membrane pump according to  claim 22 , characterized in that the supporting disc ( 20 ) is provided with a central opening ( 22 ) which permits movement of the dog ( 18 ) in the direction of the movement axis (A) of the coupling rod ( 4 ). 
     
     
         28 . The high pressure double membrane pump according to  claim 22 , characterized in that the shoulder ( 21 ) originates from a flat central area of the supporting disc ( 20 ) and ends with a partial circle in profile. 
     
     
         29 . The high pressure double membrane pump according to  claim 28 , characterized in that the partial circle of the shoulder ends in an inclined surface, wherein—seen in the profile—a tangent is formed to the inclined surface, which forms in its endpoint an angle from 20 degrees to 60 degrees to the movement axis of the coupling rod. 
     
     
         30 . The high pressure double membrane pump according to  claim 22 , provided with a membrane body ( 15 ) which is curved inwardly toward the air chamber with a saucer shape, wherein the supporting disc ( 20 ) is inserted in the concave area of the membrane curve, and the outer ring area of the membrane presses around the shoulder ( 21 ) when impacted by pressure. 
     
     
         31 . The high pressure double membrane pump according to  claim 22 , characterized in that the supporting disc is provided with cutouts or material reductions. 
     
     
         32 . The high pressure double membrane pump according to  claim 22 , characterized in that the outer side of the supporting disc pointing toward the membrane is smooth. 
     
     
         33 . A membrane element for a high pressure double membrane pump having a pressure ratio of air pressure to product pressure greater than 1:3, in a functional high pressure double membrane in which one of the pump chambers is divided into a product chamber and an air pressure chamber having changing volume, comprising the actual membrane provided with a peripherally mounted elastomer body, wherein a rigid implant body is embedded in the central region of the membrane body which is provided with a dog connected with one end to the coupling rod, comprising a rigid supporting disk, which is mounted between the end of the coupling rod and the inner side of the membrane on the dog, having a diameter which corresponds to between 50% to 95% of the diameter of the working surface of the membrane, whose periphery is formed as a rounded shoulder that is turned away from the membrane body. 
     
     
         34 . The member element according to  claim 33 , characterized in that the diameter of the supporting disc corresponds to 150% to 210% of the diameter of the implant body. 
     
     
         35 . The membrane element according to  claim 33 , characterized in that the shoulder originates from a flat central area of the supporting disc and ends with a partial circle, which ends in an inclined surface, wherein—seen in profile—a tangent is formed to the inclined surface which forms in its end point an angle of 20 degrees to 60 degrees to the movement axis of the coupling rod. 
     
     
         36 . The membrane element according to  claim 33 , provided with a saucer-shaped membrane body curved toward the air chamber, characterized in that the supporting disc is inserted in the concave area of the membrane cure and presses onto the outer ring area of the membrane when impacted by pressure.