Hose pump

Abstract

A hose pump includes a hose bed having a counter support, a carrier disk rotatable relative to the counter support, and a number of pinch rollers and guide rollers arranged on the carrier disk. A guide roller is arranged between two consecutive pinch rollers, and the pinch rollers press a hose inserted into hose bed against the counter support, while pinching the hose when the carrier disk is rotating in the conveying direction to transport the fluid in the hose. To ensure reliable threading of a hose section of a pump hose, when the hose section is somewhat too short and to prevent unthreading of the inserted hose section during operation of the hose pump, the angular distance between a guide roller and the pinch roller preceding the guide roller in the conveying direction is greater than the angular distance between this guide roller and the pinch roller following the guide roller in the conveying direction.

What is claimed is: 
     
         1 . A hose pump to convey a fluid guided in a hose, the hose pump comprising a hose bed having a counter support, a carrier disk rotatable relative to counter support, a plurality of pinch rollers arranged equidistant from each other in a peripheral direction on the carrier disk and a plurality of guide rollers arranged equidistant from each other in the peripheral direction on carrier disk, wherein one of the plurality of guide rollers is arranged between two consecutive pinch rollers in the peripheral direction of the carrier disk and the pinch rollers press a hose inserted into the hose bed against the counter support, when the carrier disk is rotating in a conveying direction, while pinching the hose against the counter support to transport the fluid in the hose in the conveying direction, wherein an angular distance between a guide roller and a pinch roller preceding said guide roller in the conveying direction is greater than an angular distance between said guide roller and a pinch roller following said guide roller in the conveying direction. 
     
     
         2 . The hose pump according to  claim 1 , wherein the angular distance between a guide roller and a pinch roller following said guide roller in the conveying direction is less than 60° and especially no more than 45°. 
     
     
         3 . The hose pump according to  claim 1 , wherein the angular distance between the guide roller and the pinch roller preceding said guide roller in the conveying direction is greater than 60° and especially at least 75°. 
     
     
         4 . The hose pump according to  claim 1 , wherein at least three pinch rollers and at least three guide rollers are arranged on carrier disk. 
     
     
         5 . The hose pump according to  claim 1 , wherein a cylinder protruding above the surface of the carrier disk is arranged in the center of the carrier disk coaxial to the axis of rotation, the outside diameter of the cylinder reaching roughly the outer periphery of the pinch rollers and the guide rollers lying radially farther outward. 
     
     
         6 . The hose pump according to  claim 5 , wherein the radial distance between the outer surface of cylinder and the outer periphery of the pinch rollers and the guide rollers is smaller than the diameter of the hose inserted into the hose bed. 
     
     
         7 . The hose pump according to  claim 1 , wherein the pinch rollers are designed to be essentially cylindrical and to have a smooth outer surface, the outer periphery of the pinch rollers being formed by the smooth outer surface. 
     
     
         8 . The hose pump according to  claim 1 , wherein the guide rollers are essentially cylindrical and have a guide groove running in the peripheral direction on the outer periphery. 
     
     
         9 . The hose pump according to  claim 8 , wherein the guide groove of each guide roller has a semicircular cross section. 
     
     
         10 . The hose pump according to  claim 1 , wherein the pinch rollers and/or the guide rollers are mounted to rotate on the carrier disk. 
     
     
         11 . The hose pump according to  claim 1 , wherein a hose inserted into the hose bed lies on a guide surface formed by the surface of the carrier disk. 
     
     
         12 . The hose pump according to  claim 1 , wherein the axis of rotation of the carrier disk and the axes of the pinch rollers and the guide rollers are parallel to each other. 
     
     
         13 . The hose pump according to  claim 1 , wherein the carrier disk and/or the pinch rollers mounted to rotate on the carrier disk and/or the guide rollers mounted to rotate on the carrier disk are placed in rotation by a drive, when the hose pump is running. 
     
     
         14 . The hose pump according to  claim 1 , in which the magnitude of the relative angular difference between the angular distance between a guide roller and the pinch roller preceding said guide roller in the conveying direction and the angular distance between said guide roller and the pinch roller following said guide roller in the conveying direction lies in the range from 0.2 to 0.5. 
     
     
         15 . The hose pump according to  claim 1 , in which the magnitude of the relative angular difference between the angular distance between a guide roller and a pinch roller preceding said guide roller in the conveying direction and the angular distance between said guide roller and the pinch roller following said guide roller in the conveying direction lies at 0.25. 
     
     
         16 . The hose pump according to  claim 1 , in which the magnitude of the relative angular difference between the angular distance between the guide roller and the pinch roller preceding said guide roller in the conveying direction and the angular distance between said guide roller and the pinch roller following said guide roller in the conveying direction lies at 0.33. 
     
     
         17 . The hose pump according to  claim 1 , wherein the counter support with an essentially circular segment shape emerges tangentially outwards in the area of the hose output of hose bed. 
     
     
         18 . A hose pump to convey a fluid guided in a hose, the hose pump comprising a hose bed having a counter support, a carrier disk rotatable relative to counter support, a plurality of pinch rollers arranged equidistant from each other in a peripheral direction on the carrier disk and a plurality of guide rollers arranged equidistant from each other in the peripheral direction on carrier disk, wherein one of the plurality of guide rollers is arranged between two consecutive pinch rollers in the peripheral direction of the carrier disk and the pinch rollers press a hose inserted into the hose bed against the counter support, when the carrier disk is rotating in a conveying direction, while pinching the hose against the counter support to transport the fluid in the hose in the conveying direction, wherein a cylinder protruding above the surface of the carrier disk is arranged in the center of the carrier disk coaxial to the axis of rotation, the outside diameter of the cylinder reaching roughly the outer periphery of the pinch rollers and the guide rollers lying radially farther outward. 
     
     
         19 . The hose pump according to  claim 18 , wherein the radial distance between the outer surface of the cylinder and the outer periphery of the pinch rollers and the guide rollers is smaller than the diameter of the hose inserted into hose bed.