Electric motor-driven pump for washing machines and the like

Abstract

Electric motor-driven pump for washing machines and the like comprising a rotor housing ( 2 ) having a coupling flange ( 3 ) connectable to a casing ( 4 ) so as to form a fluid chamber for an impeller ( 5 ), the pump comprises at least one vibration-damping spacer ( 6 ) arranged between the flange ( 3 ) and the casing ( 4 ), further the spacer ( 6 ) is integrally provided with connection means adapted to associate the flange ( 3 ) and the casing ( 4 ) to the spacer.

1 . Electric motor-driven pump for washing machines and the like comprising a rotor housing ( 2 ) having a coupling flange ( 3 ) connectable to a casing ( 4 ) so as to form a fluid chamber for an impeller ( 5 ), characterized in that said pump comprises at least one vibration-damping spacer ( 6 ) arranged between said flange ( 3 ) and said casing ( 4 ), said spacer ( 6 ) being integrally provided with connection means adapted to associate said flange ( 3 ) and said casing ( 4 ) to said spacer.  
   
   
       2 . Pump according to  claim 1 , characterized in that said connection means comprise at least one seat ( 26 ) adapted to accommodate at least one matchingly shaped associating element ( 24 ) provided on said casing ( 4 ) in order to connect the latter to the spacer ( 6 ), said seat ( 26 ) being adapted to engage at least one matchingly shaped profile ( 28 ) provided on said coupling flange ( 3 ) in order to connect the latter to the spacer.  
   
   
       3 . Pump according to  claim 1  or  2 , characterized in that said spacer ( 6 ) comprises an annular ring having an axially extending edge ( 21 ), said at least one seat ( 26 ) comprises one or more fins ( 27 ) extending from the outer edge of the spacer annular ring along the axially extending edge ( 21 ), said fins ( 27 ) forms an arcuate grooves adapted to accommodate said associating element ( 24 ) which comprises respective tongues ( 25 ).  
   
   
       4 . Pump according to  claim 1 , characterized in that said fins ( 27 ) are angularly spaced apart from one another by substantially the same angle that separates the tongues ( 25 ) so that a reciprocal rotation between the spacer ( 6 ) and the casing ( 4 ) allows the tongues ( 25 ) to be inserted into the arcuate grooves and locked between the fins ( 27 ) and the axially extending edge ( 21 ).  
   
   
       5 . Pump according to  claim 1 , characterized in that said profile ( 28 ) extends from an outer edge of said coupling flange ( 3 ) along an annular raised ridge ( 11 ) thereof, said profile ( 28 ) forming one or more undercuts ( 29 ) matchingly shaped and angularly spaced apart to accommodate said fins ( 27 ) upon a reciprocal rotation between the spacer ( 6 ) and the coupling flange ( 3 ).  
   
   
       6 . Electric motor-driven pump for washing machines and the like comprising a rotor housing ( 2 ) having a coupling flange ( 3 ) connectable to a casing ( 4 ) so as to form a fluid chamber for an impeller ( 5 ), characterized in that said pump comprises at least one vibration-damping spacer ( 6 ) arranged between said flange ( 3 ) and said casing ( 4 ), said spacer ( 6 ) being integrally provided with connection means to associate one between said flange ( 3 ) and said casing ( 4 ) to said spacer ( 6 ), said connection means being adapted to cooperate with fastening means ( 22 ) in order to associate the other between said flange ( 3 ) and said casing ( 4 ) to said spacer ( 6 ).  
   
   
       7 . Pump according to  claim 6 , characterized in that said connection means comprise at least one perforated section ( 16 ) adapted to be received in at least one matchingly shaped opening ( 17 ) formed through the coupling flange ( 3 ) so as to engage said opening ( 17 ).  
   
   
       8 . Pump according to  claim 6  or  7 , characterized in that a cylindrical through cavity is provided in said at least one perforated section ( 16 ) to accommodate said fastening means ( 22 ).  
   
   
       9 . Pump according to  claim 6 , characterized in that said spacer ( 6 ) comprises an annular ring, and said perforated section ( 16 ) protruding axially from said ring.  
   
   
       10 . Pump according to  claim 1 , characterized in that said spacer ( 6 ) is made of resilient elastic material.  
   
   
       11 . Pump according to  claim 1 , characterized in that said vibration-damping spacer ( 6 ) act as a seal element between the coupling flange ( 3 ) and the spacer ( 6 ).