Device for measuring a mass flow

Abstract

A device for measuring a mass flow ( 5 ) with guide means ( 4 ) having a surface shaped as a circular arc, across which the mass flow can flow during the measurement, and a force sensor ( 2 ), wherein the guide means ( 4 ) is supported above the force sensor ( 2 ) and the support occurs on a straight line extending through an endpoint of a radius vector r T0 r of a resulting friction force F acting on the mass flow ( 5 ) in the direction of the resulting friction force F acting on the mass flow ( 5 ).

1 . Device for measuring a mass flow ( 5 ) comprising:
 a guide means ( 4 ) having a surface formed as a circular arc, across which the mass flow is capable to flow during the measurement, and   a force sensor ( 2 ),   
     wherein the guide means ( 4 ) is supported above the force sensor ( 2 ), and the support occurs on a straight line which extends through an endpoint of a radius vector r T0   r  of a resulting friction force F acting on the mass flow ( 5 ) in the direction of the resulting friction force F acting on the mass flow ( 5 ). 
   
   
       2 . Device according to  claim 1 , wherein the straight line is inclined with respect to a horizontal by an angle η with 
     
       
         
           
             η 
             = 
             
               arctan 
                
               
                   
               
                
               
                 
                   r 
                   
                     
                       T 
                        
                       
                           
                       
                        
                       0 
                     
                     , 
                     y 
                   
                 
                 
                   r 
                   
                     
                       T 
                        
                       
                           
                       
                        
                       0 
                     
                     , 
                     x 
                   
                 
               
             
           
         
       
     
     wherein r T0   r  is the radius vector of the resulting friction force acting on the mass flow ( 5 ). 
   
   
       3 . Device according to  claim 2 , wherein the angle η is
 about η=48.48° for a friction coefficient of μ=0.1 of the flowing mass,   about η=48.70° for a friction coefficient of μ=0.2 of the flowing mass, and   about η=48.88° for a friction coefficient of μ=0.3 of the flowing mass.   
   
   
       4 . Device according to  claim 1 , wherein the radius vector r T0   r  of the resulting tangential force F acting on the mass flow ( 5 ) is oriented horizontally. 
   
   
       5 . Device according to  claim 1 , wherein the support occurs at the end point of the radius vector r T0   r  of the resulting tangential force F acting on the mass flow ( 5 ). 
   
   
       6 . Device according to  claim 1 , wherein a force measurement direction of the force sensor ( 2 ) is oriented in the direction of the radius vector r T0   r  of the resulting tangential force F acting on the mass flow ( 5 ). 
   
   
       7 . Device according to  claim 1 , wherein the guide means ( 4 ) is supported on the force sensor ( 2 ). 
   
   
       8 . Device according to  claim 1 , wherein the guide means ( 4 ) is rigidly connected with the force sensor ( 4 ), and an assembly comprising the guide means ( 4 ) and the force sensor ( 2 ) is supported on a holding means ( 1 ). 
   
   
       9 . Device according to  claim 1 , wherein the support occurs at a force-sensitive point or a force-sensitive surface of the force sensor ( 2 ). 
   
   
       10 . Device according to  claim 1 , wherein the guide means ( 4 ) is a tube shaped as an arcuated tube or a measurement chute or a slide. 
   
   
       11 . Device according to  claim 1 , wherein the device comprises a supply means ( 7 ) which is suitable and configured to supply the mass flow ( 5 ) to the guide means ( 4 ). 
   
   
       12 . Device according to  claim 11 , wherein the supply means ( 7 ) comprises one or several elements for uniformly distributing the volume flow across a flow cross-section. 
   
   
       13 . Device according to  claim 12 , wherein an element for providing a uniform distribution comprises an inclined plane across which the mass flow is guided. 
   
   
       14 . Device according to  claim 12 , wherein an element for providing a uniform distribution comprises a nozzle. 
   
   
       15 . Device according to  claim 1 , wherein the device comprises a shut-off means ( 8 ) for shutting off the mass flow ( 5 ). 
   
   
       16 . Device according to  claim 15 , wherein the shut-off means ( 8 ) is arranged in the flow direction upstream of the guide means ( 8 ). 
   
   
       16 . Device according to  claim 15 , wherein the shut-off means ( 8 ) is arranged in the flow direction downstream of the guide means ( 8 ).