Pump assembly with user-accessible wet region

Abstract

A centrifugal pump assembly, with an electric motor, arranged in a stator housing, wherein a box, containing an electrical board and closed at the free end by a lid, is arranged at an axial end of the stator housing. The pump assembly includes a wet region, further having a plug which has, at one end, a contour adapted to enter a hole connected to the wet region, acting as a flow control element, and, at the other end, a head adapted to be easily accessible to the user. The plug has such a length that the outer surface of the head is at a level that is proximate to the level of the lid of the box in a closed configuration.

1 . A centrifugal pump assembly, with an electric motor, arranged in a stator housing, wherein a box, containing an electrical board and closed at a free end by a lid, is arranged at an axial end of said stator housing, said centrifugal pump assembly comprising a wet region, and further comprising a plug which has, at one end, a contour adapted to enter a hole connected to said wet region, acting as a flow control element, and, at another end, a head adapted to be easily accessible to the user, said plug having such a length that an outer surface of said head is at a level that is proximate to the level of the lid of said box in a closed configuration. 
     
     
         2 . The centrifugal pump assembly according to  claim 1 , wherein said plug has an intermediate section having dimensions similar to dimensions of said head. 
     
     
         3 . The centrifugal pump assembly according to  claim 1 , wherein said plug has a plug covering element adapted to hide the presence of said plug. 
     
     
         4 . The centrifugal pump assembly according to  claim 1 , wherein said contour comprises a disk-like end element which continues in the hole, connected to said wet region, with a threaded element. 
     
     
         5 . The centrifugal pump assembly according to  claim 1 , wherein said head is disk-shaped and has a notch adapted for insertion of a tip of a screwdriver. 
     
     
         6 . The centrifugal pump assembly according to  claim 2 , wherein a first tubular section having a diameter that is smaller than said head is interposed between said head and said intermediate section and wherein a second tubular section having a diameter that is smaller than said first tubular section is interposed between said intermediate section and said disk-like end element. 
     
     
         7 . The centrifugal pump assembly according to  claim 1 , wherein said electrical box is provided internally with a tubular body with an axis of extension that coincides with, or is parallel to, an axis of extension of said box. 
     
     
         8 . The centrifugal pump assembly according to  claim 7 , wherein said tubular body has an extension from a surface of contact with said stator housing to said lid of said box. 
     
     
         9 . The centrifugal pump assembly according to  claim 8 , wherein at a section of said tubular body both said electrical board and said lid have a through hole with an axis of extension that coincides with the one of said tubular body. 
     
     
         10 . The centrifugal pump assembly according to  claim 9 , wherein said through hole and said tubular body are adapted for the insertion of said plug. 
     
     
         11 . The centrifugal pump assembly according to  claim 1 , wherein said electrical box and said stator housing have mutually complementary contact surfaces. 
     
     
         12 . The centrifugal pump assembly according to  claim 1 , wherein said box has one or more first pins adapted to be inserted in corresponding through holes which are present on a contact surface of the stator housing. 
     
     
         13 . The centrifugal pump assembly according to  claim 12 , wherein said box has one or more second pins, which are extended inside the box and in a direction of the lid, the tips of which are adapted for insertion in corresponding holes which are present on a surface of the lid that is directed toward the inside of the box. 
     
     
         14 . The centrifugal pump assembly according to  claim 1 , wherein said electrical board is provided with male connecting plates adapted to be inserted in female terminals connected to said electric motor. 
     
     
         15 . The centrifugal pump assembly according to  claim 1 , wherein said electrical board has, at one end, a connector which is adapted to be inserted in an electric power supply terminal which is external to the pump.