Positive displacement pump for transporting a fluid with automatic adaptation to the compressibility of the fluid

Abstract

A positive displacement pump ( 1 ) for transporting a fluid with automatic adaptation to the compressibility of that fluid has a pumping chamber ( 15 ) with a variable volume (V) which is on the one hand delimited by a rigid chamber cover plate ( 10 ) and on the other hand by an elastic diaphragm ( 9 ), a suction channel ( 29 ) which is in flow connection with the pumping chamber ( 15 ) for sucking the fluid to be transported into the pumping chamber ( 15 ), an outlet channel ( 24 ) which is in flow connection with the pumping chamber ( 15 ) for discharging the fluid to be transported from the pumping chamber ( 15 ), and a drive device ( 29 ) for cyclically increasing and reducing the current volume (V) of the pumping chamber ( 15 ), with the drive device ( 29 ) being connected to the diaphragm ( 9 ) by means of a diaphragm connecting element ( 34; 34 a; 34 b) which is spring-mounted in the drive device ( 29 ) by means of a spring element ( 33; 33 a; 33 b).

1 . Positive displacement pump for transporting a fluid comprising
 a. a pumping chamber with a variable volume (V), said pumping chamber being at least partially delimited by a suction and displacement element;   b. at least one suction channel which is in flow connection with the pumping chamber for sucking the fluid to be transported into the pumping chamber;   c. at least one outlet channel which is in flow connection with the pumping chamber for discharging the fluid to be transported from the pumping chamber;   d. a drive device for cyclically increasing and reducing the current volume (V) of the pumping chamber; and wherein   e. the drive device is spring-mounted to the suction and displacement element by means of a spring element so as to transmit force.   
   
   
       2 . Positive displacement pump according to  claim 1 , wherein the spring element is a leaf spring. 
   
   
       3 . Positive displacement pump according to  claim 1 , wherein the spring element is a helical spring. 
   
   
       4 . Positive displacement pump according to  claim 1 , wherein the spring element comprises an elastomer. 
   
   
       5 . Positive displacement pump according to  claim 1 , wherein the spring element is replaceable. 
   
   
       6 . Positive displacement pump according to  claim 1 , wherein the suction and discharge element comprises a diaphragm. 
   
   
       7 . Positive displacement pump according to  claim 1 , wherein the drive device has a rod which is supported on an eccentric disk force-fitted to a drive shaft. 
   
   
       8 . Positive displacement pump according to  claim 1 , wherein a suction valve is provided in the direction of flow between the suction channel and the pumping chamber. 
   
   
       9 . Positive displacement pump according to  claim 1 , wherein an outlet valve is provided in the direction of flow between the pumping chamber and the outlet channel. 
   
   
       10 . Positive displacement pump according to  claim 1 , wherein at least one of the valves comprises a valve flap.