Peristaltic pump

Abstract

The invention relates to a multi-channel peristaltic pump, wherein the housing is constituted by a dimensionally stable support frame ( 1 ) and a tube retainer ( 2 ) clipped thereto by means of a snap connection. A rotor ( 3 ) is provided with three rotatable delivery rolls ( 33 a, 33 b, 33 c ) and is mounted on the support frame ( 1 ). The tube retainer ( 2 ) is provided with a tube bed body ( 25 ) which defines on the inside a tube bed and at the end two legs ( 2 a, 2 b ). Flexible tube sections ( 43 ) are received in the tube bed and can be squeezed by the delivery rolls ( 33 a, 33 b, 33 c ) to peristaltically deliver a medium. The two legs ( 2 a, 2 b ) are resiliently elastic so that they can be radially clipped into the support frame ( 1 ). The tube bed body ( 25 ) has a substantially omega-shaped design and is provided with a continuous inlet and outlet area that ensures a peristaltic delivery of the respective medium with only few pulsations. The inventive pump is compact in design, consists of few components and can be quickly and easily assembled.

1 . Peristaltic pump, with a rotor ( 3 ) received in a housing, which is provided with at least one rotatably supported conveyor roller ( 33   a ,  33   b ,  33   c ), as well as with a tubing holder ( 2 ) for receiving of at least one flexible tubing section ( 43 ) that is squeezable by the conveyor roller ( 33   a ,  33   b ,  33   c ) for peristaltically conveying a medium, characterized in that the tubing holder ( 2 ) is provided with a tubing bed body member ( 25 ) for receiving of at least one flexible tubing section ( 43 ), whereby the inlet and/or the outlet region ( 35 , 36 ) of the tubing bed body member ( 25 ) is designed such that the cross sectional area of the tubing relevant for the conveying is continuously decreased and increased, respectively, by the conveyor roller ( 33   a ,  33   b ,  33   c ) rolling over the particular tube section ( 43 ).  
   
   
       2 . Pump according to  claim 1 , characterized in that the tubing bed body member ( 25 ), in the inlet region ( 35 ), passes over from the convex shape to a concave shape in a smooth transition, as seen in the sense of rotation.  
   
   
       3 . Pump according to  claim 1 , characterized in that the tubing bed body member ( 25 ), in the outlet region ( 36 ), passes over from a concave shape to a convex shape in a smooth transition, as seen in the sense of rotation.  
   
   
       4 . Pump according to  claim 2 , characterized in that at least two conveyor rollers ( 33   a ,  33   b ,  33   c ) are provided, and that, with regard to the axis of rotation of the rotor ( 3 ), the inlet region ( 35 ) is located with regard to the outlet region ( 36 ) such that, if one of the conveyor rollers ( 33   a ) is in the inlet region ( 35 ), another conveyor roller ( 33   c ) simultaneously is in the outlet region ( 36 ).  
   
   
       5 . Pump according to  claim 2 , characterized in that the tubing bed body member is designed essentially in the shape of an omega.  
   
   
       6 . Pump according to  claim 2 , characterized in that e tubing bed body member ( 25 ) at least partially and coaxially enlaces the rotor ( 3 ).  
   
   
       7 . Pump according to  claim 2 , characterized in that the tubing bed body member ( 25 ), together with a support frame ( 1 ), constitutes the housing of the pump, whereby the tubing bed body member has two legs ( 2   a ,  2   b ) at its end which are resiliently elastic in radial direction and provided with notch elements, by means of which the tubing bed body member ( 25 ) can be snapped into cut-outs ( 13 ) on the support frame ( 1 ) in the sense of a snap-on connection.  
   
   
       8 . Pump according to  claim 2 , characterized in that the tubing bed body member ( 25 ) is designed such that its dimensional stability and fixation at the support frame ( 1 ) is supported, in addition to the elastically resilient inherent tenseness of the legs ( 2   a ,  2   b ), by the mutual force action of the squeezed tubing section and the squeezed tubing sections ( 43 ), respectively.  
   
   
       9 . Pump according to  claim 2 , characterized in that the tubing bed body member ( 25 ) is provided with a plurality of radially and/or axially extending reinforcing ribs ( 23 ,  24 ).  
   
   
       10 . Pump according to  claim 2 , characterized in that the inner side of the tubing bed body member ( 25 ) is provided with a multitude of groove-like recesses ( 21 ) for receiving and guiding a plurality of tubing sections ( 43 ).  
   
   
       11 . Pump according to  claim 2 , characterized in that the particular conveyor roller ( 33   a ,  33   b ,  33   c ) is in the shape of a barrel and extends in axial directions over the groove-like recesses ( 21 ).  
   
   
       12 . Pump according to  claim 2 , characterized in that the particular tubing section is led into and out of the tubing bed body member ( 25 ) in substantially tangential direction.  
   
   
       13 . Pump according to  claim 2 , characterized in that the rotor ( 3 ) is provided with at least two conveyor rollers ( 33   a ,  33   b ,  33   c ), and that the tubing bed body member ( 25 ) coaxially enlaces the rotor ( 3 ) by an amount of 360° divided by the number of conveyor rollers.  
   
   
       14 . Pump according to  claim 1 , characterized in that the rotor ( 3 ) is provided with three conveyor rollers ( 33   a ,  33   b ,  33   c ), and the inlet portion ( 35 ) is offset around the axis of rotation of the rotor ( 3 ) with regard to the outlet portion ( 36 ) by 210° to 270°, preferably by approximately 240°.  
   
   
       15 . Pump according to  claim 2 , characterized in that the tubing bed body member ( 25 ), in the outlet region ( 36 ), passes over from a concave shape to a convex shape in a smooth transition, as seen in the sense of rotation.