Cooling systems for submersible pumps
A pump ( 1 ) includes a shaft ( 21 ) for driving an impeller ( 81 ) in a pump chamber ( 80 ); an electrical motor chamber ( 60 ) extending essentially circumferentially around a motor section of the shaft ( 21 ); a cooling circuit chamber ( 30 ) for being filled with a cooling liquid; and a mechanical seal chamber ( 40 ) extending essentially circumferentially around a seal section of the shaft ( 21 ), with the mechanical seal chamber ( 40 ) adapted for being filled with oil. The pump ( 1 ) may be a submersible pump.
1. A submersible pump, comprising:
a shaft ( 21 ) for driving an impeller ( 81 ) in a pump chamber ( 80 ), the pump chamber having an inlet and an outlet for a pumped liquid;
an electrical motor chamber ( 60 ) extending essentially circumferentially around a motor section of the shaft ( 21 );
a cooling circuit chamber ( 30 ) for being filled with a cooling liquid; and
a mechanical seal chamber ( 40 ) extending essentially circumferentially around a seal section of the shaft ( 21 ), with the mechanical seal chamber ( 40 ) adapted for being filled with oil, and
an oil chamber ( 50 ) adapted for being filled with oil,
wherein the electrical motor chamber ( 60 ), the cooling circuit chamber ( 30 ), the mechanical seal chamber ( 40 ) and the pump chamber are hermetically sealed from each other, wherein at least part of the cooling circuit chamber ( 30 ) extends essentially circumferentially around the electrical motor chamber ( 60 ),
wherein the oil chamber ( 50 ) extends essentially circumferentially around the mechanical seal chamber ( 40 ), and wherein
the oil chamber ( 50 ) extends essentially circumferentially around a part ( 30 A) of the cooling circuit chamber ( 30 ) and the cooling circuit extends essentially circumferentially around the mechanical seal chamber ( 40 ).
2. The pump in accordance with claim 1 , wherein the electrical motor chamber is dry or oil filled.
3. The pump in accordance with claim 1 , wherein the cooling circuit chamber ( 30 ) extends essentially circumferentially around the shaft ( 21 ).
4. The pump in accordance with claim 1 , wherein the oil chamber ( 50 ) is in liquid communication with the mechanical seal chamber ( 40 ).
5. The pump in accordance with claim 4 , further comprising a cooling diffuser ( 34 , 35 ) essentially enclosing the oil chamber ( 50 ), wherein at least a part of the cooling diffuser ( 34 ) provides at least one essentially radial passageway ( 39 ) for the oil to pass between the oil chamber ( 50 ) and the mechanical seal chamber ( 40 ), and at least one essentially axial passageway ( 38 ) for the cooling liquid in the cooling circuit chamber ( 30 ), wherein the at least one essentially radial passageway ( 39 ) and the at least one essentially axial passageway ( 38 ) are hermetically separated from one another.
6. The pump in accordance with claim 5 , wherein the total cross section of the at least one essentially axial passageway ( 38 ) is larger than the total cross section of the at least one essentially radial passageway ( 39 ).
7. The pump in accordance with claim 1 , wherein the mechanical seal chamber ( 40 ) comprises a mechanical seal cartridge ( 41 ) for separating the electrical motor chamber ( 60 ) from the pump chamber ( 80 ).
8. The pump in accordance with claim 7 , wherein the mechanical seal cartridge ( 41 ) comprises at least one mechanical seal ( 42 ).
9. The pump in accordance with claim 7 , wherein the mechanical seal cartridge ( 41 ) comprises at least two mechanical seals ( 42 ′, 42 ″).
10. The pump in accordance with claim 1 , wherein the mechanical seal chamber ( 40 ) comprises a leak detector.
11. The pump in accordance with claim 1 , wherein at least one seal ( 45 ) is provided on the seal section of the shaft ( 21 ) for sealing the dry electrical motor chamber ( 60 ) from the cooling circuit chamber ( 30 ).
12. The pump in accordance with claim 11 , wherein the at least one seal ( 45 ) for sealing the electrical motor chamber ( 60 ) from the cooling circuit chamber ( 30 ) is selected from a lip seal or mechanical seal.
13. The pump in accordance with claim 1 , wherein at least one upper seal ( 43 ) is provided on the seal section of the shaft ( 21 ) for sealing the cooling circuit chamber ( 30 ) from the mechanical seal chamber ( 40 ).
14. The pump in accordance with claim 13 , wherein the at least one upper seal ( 43 ) for sealing the cooling circuit chamber ( 30 ) from the mechanical seal chamber ( 40 ) is selected from a V-ring or lip seal.
15. The pump in accordance with claim 1 , wherein at least one lower seal ( 44 ) is provided on the seal section of the shaft ( 21 ) for sealing the mechanical seal chamber ( 40 ) from the pump chamber ( 80 ).
16. The pump in accordance with claim 15 , wherein the at least one lower seal ( 44 ) for sealing the cooling circuit chamber ( 30 ) from the mechanical seal chamber ( 40 ) is selected from a V-ring or lip seal.
17. The pump in accordance with claim 1 , wherein the cooling liquid comprises glycol.
18. The pump in accordance with claim 16 wherein the cooling liquid further comprises water.
19. The pump in accordance with claim 1 , wherein the cooling circuit chamber ( 30 ) is in the form of a closed loop for the cooling liquid.
20. The pump in accordance with claim 19 , wherein an internal impeller ( 33 ) is provided for moving the cooling liquid in the closed-loop cooling circuit chamber ( 30 ).