Low-noise pump cooled by the pumped water

Abstract

The invention is a new pump comprising an electric immersion motor (M) and two or more centrifugal impellers (G) enclosed by two concentric cylindrical jackets (Ci, Ce), so as to create an interspace (Ia) between the internal jacket (Ci) and the motor (M) and an interspace (Im) between said two jackets (Ci, Ce). The pumped water flows through the internal interspace (Ia) striking the motor (M), passes through the centrifugal impellers (G) and through the interspace (Im) between the two jackets (Ci, Ce) before being expelled by the pump. The internal jacket (Ci) has a hole (Cio) in its bottom (Cif), through which the volume inside the internal jacket (Ci) communicates with the interspace (Im). The two connections (Oa, Om) are positioned radially to the jackets (Ci, Ce), opposite each other and coaxial. An inverter controls the pump automatically.

1 . Pump, comprising: 
 an electric immersion motor having an axle connected to at least two centrifugal impellers; and    at least two concentric cylindrical jackets enclosing the motor with the concentric impellers so as to create an a first interspace between an internal jacket and the motor and a second interspace between the jackets; and wherein pumped water flows through the first interspace striking the motor, passes through the centrifugal impellers and flows through the second interspace between the two jackets before being expelled.    
   
   
       2 . Pump according to  claim 1 , further comprising: a suction connection through which water is suctioned, connected to the internal first jacket passing through a side wall of the external second jacket, and wherein, while delivery connection through which the water is conveyed, said suction connection is connected only to the external second jacket and the second interspace between the two jackets, and wherein said two connections are positioned radially to the jackets opposite to each other and coaxial.  
   
   
       3 . Pump according to  claim 1 , wherein the jackets are shaped like a cup, each being comprised of two metallic cylinders with a closing bottom at one respective end, and wherein the internal jacket has a hole in its bottom, through which a volume inside the internal jacket communicates with the second interspace between said two jackets, and wherein a base applied to the open ends of the two jackets closes said two jackets and keeps them the jackets in their reciprocal positions.  
   
   
       4 . Pump according to  claim 1  wherein the electric motor is housed inside the internal jacket, resting on the base and forming between said motors and said internal jacket a cylindrical interspace, and wherein the centrifugal impellers applied to the rotating shaft of the motor draw the water from the first interspace between the motor and the internal jacket and convey it the water under pressure into the second interspace between the two jackets through the hole in the bottom of the internal jacket.  
   
   
       5 . Pump according to  claim 1 , further comprising: an inverter comprised of an electric power static converter in two main water input and output sections, controlling and managing all motor and all pump operations.  
   
   
       6 . Pump according to  claim 5 , wherein said inverter automatically manages dry operation and relative stop intervals and restart attempts, pump automatic start-up with relative acceleration and deceleration times, insertion of pause times between a start control and a stop control with programmable duration, possible high-torque pump start-up.  
   
   
       7 . Pump according to  claim 5 , wherein said inverter further comprises an electric power static converter divided into two main sections: the input section and the output section, and wherein the input section is comprised of a diode rectifier connected to the mains power supply and converts electric current from AC to DC and wherein the output section consists of an IGBT three-phase inverter and converts the electric current from DC to AC with frequency and amplitude control of the generated AC voltage.