Rotary lobe pump and rotary lobes

Abstract

The invention relates to a rotary lobe pump ( 10 ) for conveying fluids, in particular liquids laden with solid matter, comprising a casing ( 45 ) and at least one pair of intermeshing rotary lobes ( 1 ) arranged inside the casing ( 45 ), each rotary lobe ( 1 ) having at least one recess ( 13, 43 ) formed on the circumferential surface ( 5 ) thereof and/or at least one recess ( 41 ) formed on an end surface ( 7, 9 ) thereof. The invention relates to in particular a rotary lobe pump, in which at least one trap member ( 15, 17, 39, 51 ) is arranged in at least one recess ( 13, 41, 43 ) and is adapted to capture solid matter. The invention also relates to a rotary lobe ( 1 ) for a rotary lobe pump ( 10 ) for conveying fluids, in particular liquids laden with solid matter, said rotary lobe having at least one recess ( 13, 43 ) formed on the circumferential surface ( 5 ) thereof and/or at least one recess ( 41 ) formed on an end surface ( 7, 9 ) thereof.

1 . A rotary lobe pump for conveying fluids, in particular liquids laden with solid matter, comprising
 a casing and at least one pair of intermeshing rotary lobes arranged inside the casing, each rotary lobe having at least one recess formed on the circumferential surface thereof and/or at least one recess formed on an end surface thereof,   characterised in that at least one trap member is arranged in at least one recess and is adapted to capture solid matter.   
     
     
         2 . The rotary lobe pump according to  claim 1 ,
 characterised in that a gap is formed between an edge of the at least one recess and the at least one trap member.   
     
     
         3 . The rotary lobe pump according to  claim 1 ,
 characterised in that the gap has widened wedge-shaped sections.   
     
     
         4 . The rotary lobe pump according to  claim 1 ,
 characterised in that the at least one recess is in the form of a groove and has a cross-section which is   substantially rectangular, and/or   at least partially conically tapered towards the bottom of the recess, or   conically widened at least partially towards the bottom of the recess.   
     
     
         5 . The rotary lobe pump according to  claim 1 ,
 characterised in that the at least one trap member is in the form of a flat body, wherein the height of the flat body is less than or equal to the depth of the recess accommodating the at least one trap member.   
     
     
         6 . The rotary lobe pump according to  claim 5 ,
 characterised in that one or more wedge-shaped recesses are provided on at least one lateral surface of the at least one trap member, which faces the edge of the recess.   
     
     
         7 . The rotary lobe pump according to  claim 5 ,
 characterised in that the at least one trap member has a plurality of adjacently arranged projections, between each of which a gap is formed.   
     
     
         8 . The rotary lobe pump according to  claim 1 ,
 characterised in that the at least one trap member is embodied in the form of a dowel pin, threaded pin or head screw, wherein a plurality of trap members are preferably fixed adjacently and reversibly detachable in the at least one recess, and wherein a gap is formed between each pair of adjacent trap members.   
     
     
         9 . The rotary lobe pump according to  claim 1 ,
 characterised in that the at least one trap member is embodied in the form of a coil spring which is arranged at least predominantly inside the recess, wherein the longitudinal axis of the coil spring is arranged parallel to the bottom of the recess.   
     
     
         10 . The rotary lobe pump according to  claim 1 ,
 wherein the rotary lobes have a sealing line on each vane, along which the rotary lobes are at a minimal distance from an inner wall of the casing, and a plurality of recesses are arranged in the circumferential surface adjacently and preferably parallel to the sealing line,   characterised in that elastically deformable seal members are provided as trap members, which extend partially outside the recess in the direction of the inner wall of the casing.   
     
     
         11 . The rotary lobe pump according to  claim 8 ,
 characterised in that one or more trap members embodied as head screws are fixed in the at least one recess, wherein the head screws preferably have no anti-fatigue portion, and/or   are screwed into a threaded hole, the thread of which extends in the fastened state to a contact surface of the head screw.   
     
     
         12 . Rotary lobes for a rotary lobe pump for conveying fluids, in particular liquids laden with solid matter, said rotary lobe having at least one recess formed on the circumferential surface thereof and/or at least one recess formed on an end surface thereof,
 characterised in that at least one trap member is arranged in at least one recess and is adapted to capture solid matter.   
     
     
         13 . A method for sealing a rotary lobe against an inner wall of the casing of a rotary lobe pump, comprising the steps of:
 conveying a fluid, in particular a liquid laden with solid matter, by means of the rotary lobe pump,   capturing solid matter from the conveyed fluid by means of at least one trap member which is arranged in at least one recess of the rotary lobe.