Tandem electric pump

Abstract

A tandem pump with a pump housing that includes a first pump portion with a first pump inlet and first pump outlet. The pump housing further includes a second pump portion having a second pump inlet and a second pump outlet. Within the pump housing is a rotatable common shaft that extends between the first and second pump portions. A first pump chamber that includes a first pump element with a first pump outer rotor surrounding a first pump inner rotor. The first pump inner rotor is connected to a first end of the common shaft. A second pump chamber has a second pump element operationally connected to a second end of the common shaft located opposite the first end of the common shaft. A stator is positioned in the first pump portion of the pump housing and circumscribes the first pump outer rotor.

1 . A tandem pump comprising:
 a pump housing defining a first pump portion having a first pump inlet and first pump outlet, a second pump portion having a second pump inlet and a second pump outlet;   a common shaft rotatably positioned in said pump housing and extending between said first pump portion and said second pump portion;   a first pump chamber of said first pump portion having a first pump element with a first pump outer rotor surrounding a first pump inner rotor, wherein said first pump inner rotor is connected to a first end of said common shaft;   a second pump chamber of said second pump portion having a second pump element operationally connected to a second end of the common shaft, opposite the first end of the common shaft; and   a stator contained in said first pump portion of said pump housing circumscribing said first pump outer rotor, wherein said stator and said first pump outer rotor are magnetically coupled so that energization of said stator causes said first pump outer rotor to rotate and pump a first fluid through said first pump chamber between said first pump inlet and said first pump outlet, and rotation of said first pump outer rotor causes rotation of said first pump inner rotor that is translated to said second pump element through said common shaft, wherein said second pump element rotates causing a second fluid to pump through said second pump chamber between said second pump inlet and said second pump outlet.   
     
     
         2 . The tandem pump of  claim 1  wherein the second pump element includes a second pump outer rotor surrounding a second pump inner rotor, wherein said second pump inner rotor is connected to a second end of the common shaft, opposite the first end of the common shaft. 
     
     
         3 . The tandem pump of  claim 1  wherein the second pump chamber further comprises:
 said second pump chamber defined by a wet sleeve and volute, wherein said volute is connected to the pump housing and defines a flow path between the second pump inlet and the second pump outlet and the wet sleeve prevents the second fluid from leaving the second pump chamber; 
 a magnetic rotor connected to the second pump element, wherein the magnetic rotor and the second pump element are rotatably positioned within the second fluid in said second pump chamber ; 
 a magnetic coupling connected to the second end of the common shaft within the pump housing, wherein the magnetic coupling is outside of the second pump chamber and is magnetically coupled to the magnetic rotor through the wet sleeve wherein rotation of the magnetic coupling causes rotation of the magnetic rotor and rotation of the second pump element. 
 
     
     
         4 . The tandem pump of  claim 3  further comprising a single electronics controller contained within the pump housing for controlling the energization of the stator, wherein the single electronics controller is in heat sink contact with a dry side of the wet sleeve so that the second fluid pumping though the second pump chamber cools the single electronics controller. 
     
     
         5 . The tandem pump of  claim 4  wherein the single electronics controller includes one or more insulated-gate bipolar transistors. 
     
     
         6 . The tandem pump of  claim 1  further comprising a single electronics controller contained within the pump housing for controlling the energization of the stator. 
     
     
         7 . The tandem pump of  claim 6  wherein the single electronics controller includes one or more insulated-gate bipolar transistors. 
     
     
         8 . The tandem pump of  claim 7  wherein the pump housing includes a removable pump cover where the single electronics controller is connected in contact with the pump cover for better heat conductivity. 
     
     
         9 . The tandem pump of  claim 1  wherein the second pump portion is a water pump and the first pump portion is an oil pump. 
     
     
         10 . The tandem pump of  claim 1  wherein the second pump portion is a transmission oil pump and the first pump portion is an engine oil pump. 
     
     
         11 . A tandem pump comprising:
 a pump housing defining a first pump portion having a first pump inlet and first pump outlet, a second pump portion having a second pump inlet and a second pump outlet;   a first magnetic coupling element connected to a first end of a first shaft and a second end of said first shaft extends into said a first pump chamber of the first pump portion where a first pump element is rotatably connected to a second end of the first shaft;   the second pump portion includes a second pump chamber defined by a wet sleeve and volute, wherein said volute is connected to the pump housing and defines a flow path between the second pump inlet and the second pump outlet;   a second magnetic coupling element connected to a second shaft, wherein the second magnetic coupling and the second shaft are rotatably positioned in said wet sleeve;   a second pump element coupled to an end of the second shaft positioned in said volute, said second pump element is configured to rotate with said second shaft;   a stator contained in said pump housing having a first coil and a second coil with the first coil circumscribing the first magnetic coupling element of the first pump portion and the second coil circumscribes the second magnetic coupling element, wherein energization of said first coil causes said first shaft to rotate the first pump element and pump a first fluid through said first pump chamber between said first pump inlet and said first pump outlet and energization of said second coil acts on said second magnetic coupling element to cause rotation of said second shaft and rotate said second pump element which causes a second fluid to pump through said second pump chamber between said second pump inlet and said second pump outlet.   
     
     
         12 . The tandem pump of  claim 11  further comprising a single electronics controller contained within the pump housing for controlling the energization first coil and second coil independently using the single electronics controller, wherein the single electronics controller is in heat sink contact with a dry side of the wet sleeve so that the second fluid pumping though the second pump chamber cools the single electronics controller. 
     
     
         13 . The tandem pump of  claim 12  wherein the single electronics controller includes one or more insulated-gate bipolar transistors. 
     
     
         14 . The tandem pump of  claim 11  wherein the pump housing includes a removable pump cover where the single electronics controller is connected in contact with the pump cover for better heat conductivity. 
     
     
         15 . A tandem pump comprising:
 a pump housing defining a first pump portion having a first pump inlet and first pump outlet, a second pump portion having a second pump inlet and a second pump outlet;   a first pump chamber of said first pump portion having a first pump element having a first pump outer rotor surrounding a first pump inner rotor, wherein said first pump inner rotor is connected to a first end of a first shaft, said first shaft being rotatably positioned in the pump housing;   a second pump chamber of said second pump portion having a second pump element operationally connected to a first end of a second shaft, said second shaft being rotatably positioned in the pump housing;   a first magnetic coupling element connected to the first pump outer rotor;   a second magnetic coupling element coupled at the second end of the second shaft; and   a stator contained in said pump housing having a first coil and a second coil with the first coil circumscribing the first magnetic coupling element of the first pump portion and the second coil circumscribes the second magnetic coupling element, wherein energization of said first coil acts on the first magnetic coupling element to cause said first pump outer rotor to rotate and pump a first fluid through said first pump chamber between said first pump inlet and said first pump outlet and energization of the second coil acts on said second magnetic coupling to cause rotation of said second shaft which rotates said second pump element and causes a second fluid to pump through said second pump chamber between said second pump inlet and said second pump outlet.   
     
     
         16 . The tandem pump of  claim 15  further comprising a single electronics controller contained within the pump housing for independently energizing the first coil and the second coil. 
     
     
         17 . The tandem pump of  claim 16  wherein the single electronics controller includes one or more insulated-gate bipolar transistors. 
     
     
         18 . The tandem pump of  claim 17  wherein the pump housing includes a removable pump cover where the single electronics controller is connected in contact with the pump cover for better heat conductivity. 
     
     
         19 . The tandem pump of  claim 15  wherein the second pump portion is a transmission oil pump and the first pump portion is an engine oil pump. 
     
     
         20 . A tandem pump comprising:
 a pump housing defining a first pump portion having a first pump inlet and first pump outlet, a second pump portion having a second pump inlet and a second pump outlet;   a first pump chamber of said first pump portion having a first pump element having a first pump outer rotor surrounding a first pump inner rotor, wherein said first pump inner rotor is connected to a first end of a first shaft, said first shaft being rotatably positioned in the pump housing;   a second pump chamber of said second pump portion having a second pump element operationally connected to a first end of a second shaft, said second shaft being rotatably positioned in the pump housing;   a single rotor rotatably positioned inside of said pump housing connected to the first shaft and the second shaft, said single rotor having a magnetic coil wound on its outside surface   a first clutch member coupled between the single rotor and said first shaft;   a second clutch member coupled between the single rotor and said second shaft; and   a stator contained in said pump housing having a stator coil circumscribing the magnetic coil of the single rotor, wherein said stator coil is energized in one of a first manner or a second manner where energization in said first manner causes the single rotor will rotate in a first direction causing said second clutch element to disengage and said first clutch element to engage and drive the first shaft to rotate the first pump member, and energization of said stator coil in a second manner causes said single rotor to rotate in a second direction causing said first clutch to disengage and said second clutch to engage and drive the second shaft to rotate the second pump member.   
     
     
         21 . The tandem pump of  claim 20  further comprising a single electronics controller contained within the pump housing for controlling the energization of the stator. 
     
     
         22 . The tandem pump of  claim 21  wherein the single electronics controller includes one or more insulated-gate bipolar transistors. 
     
     
         23 . The tandem pump of  claim 21  wherein the pump housing includes a removable pump cover where the single electronics controller is connected in contact with the pump cover for better heat conductivity. 
     
     
         24 . The tandem pump of  claim 21  wherein the second pump portion is a water pump and the first pump portion is an oil pump. 
     
     
         25 . The tandem pump of  claim 21  wherein the second pump portion is a transmission oil pump and the first pump portion is an engine oil pump. 
     
     
         26 . The tandem pump of  claim 21  wherein the first pump element includes a first pump outer rotor surrounding a first pump inner rotor, wherein said first pump inner rotor is connected to the first shaft and rotates with the first shaft to pump fluid through the first pump chamber. 
     
     
         27 . The tandem pump of  claim 21  wherein the second pump element includes a second pump outer rotor surrounding a second pump inner rotor, wherein said second pump inner rotor is connected to the second shaft and rotates with the second shaft to pump fluid through the second pump chamber.