Abstract: A pump includes first and second impellers and a sealing element. The sealing element is arranged between the first and second impellers around the drive shaft. The sealing element has a first end transvers to the drive shaft and facing the first impeller and a second end transverse to the drive shaft facing the second impeller. The sealing element has a length along an axis smaller than the distance between the first and second impellers such that the sealing element is movable along the axis between the first and second impellers. The first and second ends of the sealing element have first and second areas transverse to the axis, the first area being larger than the second area such that the force exerted by the lower pressure generated by the first impeller is substantially equal to the force exerted by the higher pressure generated by the second impeller.

Abstract: A pump includes first and second impellers and a sealing element. The sealing element is arranged between the first and second impellers around the drive shaft. The sealing element has a first end transvers to the drive shaft and facing the first impeller and a second end transverse to the drive shaft facing the second impeller. The sealing element has a length along an axis smaller than the distance between the first and second impellers such that the sealing element is movable along the axis between the first and second impellers. The first and second ends of the sealing element have first and second areas transverse to the axis, the first area being larger than the second area such that the force exerted by the lower pressure generated by the first impeller is substantially equal to the force exerted by the higher pressure generated by the second impeller.

Abstract: A pump for fluids includes a pump housing, a power source enclosed within the housing, a drive shaft connected to the power source, at least one pump inlet arranged in the pump housing, a pump outlet arranged in the pump housing, a first impeller arranged within a first impeller chamber and rotated by the drive shaft, and a second impeller arranged within a second impeller chamber and rotated by the drive shaft. The pump is changeable between a first configuration in which the first and second impeller are arranged in parallel to provide a high pumping capacity, and a second configuration in which the first and second impeller are arranged in series to provide a pump with less pumping capacity.

Abstract: Disclosed is a system for controlling a pump, such as a submersible pump intended for pumping water, including a pump and a separate electronic control unit connected to the pump by an electrical cable. The control unit is adapted to be detachably connected to the pump. The control unit is adapted to allow the pump's power supply to pass through the control unit. An electronic controller is arranged in the pump for controlling at least one of the pump's functions and/or monitoring at least one of the pump's operating conditions. The pump and the control unit are adapted to communicate with each other and transmitting signals, including necessary control and/or monitoring information/data, between each other.

Abstract: A pump for fluids includes a pump housing, a power source enclosed within the housing, a drive shaft connected to the power source, at least one pump inlet arranged in the pump housing, a pump outlet arranged in the pump housing, a first impeller arranged within a first impeller chamber and rotated by the drive shaft, and a second impeller arranged within a second impeller chamber and rotated by the drive shaft. The pump is changeable between a first configuration in which the first and second impeller are arranged in parallel to provide a high pumping capacity, and a second configuration in which the first and second impeller are arranged in series to provide a pump with less pumping capacity.

Abstract: Disclosed is a system for controlling a pump, such as a submersible pump intended for pumping water, including a pump and a separate electronic control unit connected to the pump by an electrical cable. The control unit is adapted to be detachably connected to the pump, by that the control unit is adapted to allow the pumps power supply to pass through the control unit, by that an electronic controller is arranged in the pump for controlling at least one of the pump's functions and/or monitoring at least one of the pump's operating conditions, and by that the pump and the control unit are adapted to communicate with each other and transmitting signals, including necessary control and/or monitoring information/data, between each other.