Peristaltic pump

Abstract

A peristaltic pump for dispensing liquid includes a front casing portion, a rear casing snap-fitted together with the front casing portion, a rotor confined between the front casing portion and the rear casing portion, a plurality of rollers mounted in the rotor, and a flexible tube compressed at equally spaced intervals by the plurality of rollers. The pump is resistant to constant torques and vibrations caused by a machine to which it is attached so that the pump does not become loose and fall apart. In a first embodiment for low torque and low vibration operations, the pump is screwless. In a second embodiment for high torque and high vibration operations, two screws secure a synchronous gear motor to the pump.

1 . A peristaltic pump for dispensing liquid, comprising: 
 a. a front casing portion;    b. a rear casing portion snap-fitted together with the front casing portion;    c. a rotor confined between the front casing portion and the rear casing portion;    d. a plurality of rollers mounted in the rotor; and    e. a flexible tube compressed at equally spaced intervals by the plurality of rollers;    wherein the pump is resistant to constant torques and vibrations.    
   
   
       2 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 at least a pair of open-ended boxes and spring clip pairs configured to snap-fit together the front casing portion and the rear casing portion.    
   
   
       3 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 a tongue in a recess and a mating groove configured to snap-fit together the front casing portion and the rear casing portion.    
   
   
       4 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 a bracket formed integrally with the front casing portion.    
   
   
       5 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 at least a pair of bosses and sleeves aligned and fused together by ultrasonic welding on the front casing portion and the rear casing portion, respectively.    
   
   
       6 . A peristaltic pump for dispensing liquid according to  claim 5 , further comprising: 
 a skirt at least partially surrounding each of the sleeves on the rear casing portion.    
   
   
       7 . A peristaltic pump for dispensing liquid according to  claim 5 , further comprising: 
 a synchronous gear motor having ears and being attached therethrough by ultrasonic welding to the rear casing portion.    
   
   
       8 . A peristaltic pump for dispensing liquid according to  claim 7 , further comprising: 
 screws passing through the ears on the synchronous gear motor and the sleeves on the rear casing portion and being secured at the front casing portion so that the pump is resistant to high torques and high vibrations.    
   
   
       9 . A peristaltic pump for dispensing liquid according to  claim 7 , further comprising: 
 an output shaft extending from the motor and rotating the rotor.    
   
   
       10 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 an inlet channel formed integrally on the front casing portion and configured to hold the flexible tube in place.    
   
   
       11 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 an outlet channel formed integrally on the front casing portion and configured to hold the flexible tube in place.    
   
   
       12 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 an inlet suction branch configured to bring the liquid flowing into the flexible tube.    
   
   
       13 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 a plurality of mated inserts and barrels formed integrally on the rotor and configured to carry the plurality of rollers.    
   
   
       14 . A peristaltic pump for dispensing liquid according to  claim 13 , further comprising: 
 a dowel mounted inside the rotor and configured to align the plurality of mated inserts and barrels.    
   
   
       15 . A peristaltic pump for dispensing liquid according to  claim 1 , further comprising: 
 T-shaped supports configured to reinforce the rotor.    
   
   
       16 . A screwless peristaltic pump for dispensing liquid, comprising: 
 a. a front casing portion;    b. a rear casing portion snap-fitted together with the front casing portion;    c. at least a pair of bosses and sleeves configured to be heat-welded together between the front casing portion and the rear casing portion;    d. a rotor confined between the front casing portion and the rear casing portion;    e. a plurality of rollers mounted in the rotor; and    f. a flexible tube compressed at equally spaced intervals by the plurality of rollers;    wherein the pump is resistant to low torques and low vibrations.    
   
   
       17 . A screwless peristaltic pump for dispensing liquid according to  claim 16 , further comprising: 
 at least a pair of open-ended boxes and spring clip pairs configured to snap-fit together the front casing portion and the rear casing portion.    
   
   
       18 . A screwless peristaltic pump for dispensing liquid according to  claim 16 , further comprising: 
 a recess and a mating groove configured to snap-fit together the front casing portion and the rear casing portion.    
   
   
       19 . A screwless peristaltic pump for dispensing liquid according to  claim 16 , further comprising: 
 a synchronous gear motor having ears and being attached therethrough by ultrasonic welding to the rear casing portion.    
   
   
       20 . A screwless peristaltic pump for dispensing liquid according to  claim 16 , further comprising: 
 a skirt at least partially surrounding each of the sleeves.