Pump for evacuation of viscous liquids

Abstract

A pump for evacuating heavy oil containing mechanical impurities and embedded in strata is disclosed. The pump includes one or more tanks, each with a flexible membrane, situated in an external pump casing. Each flexible membrane divides each tank into two compartments. The first compartment of each tank is in fluid communication with a collector cavity. The second compartment of each tank is in fluid communication with a suction cavity. The suction cavity includes a suction valve and a forcing valve. The pump also includes a hydraulic drive connected with the collection cavity so that operational fluid from the hydraulic drive is forced against the membrane upon insertion of a hydraulic rod and creates suction against the membrane upon extraction of the rod. The external pump casing also includes a change lever for connecting to external pipes.

1 . A pump for evacuating viscous liquid, comprising: 
 an external pump casing;    a sealed collector cavity;    a suction cavity, said suction cavity including a suction valve and a forcing valve;    one or more tanks, each tank including a flexible membrane wherein each flexible membrane hermetically divides each tank into a first compartment and a second compartment, wherein the first compartment of each tank includes openings for fluid communication with said collector cavity and wherein the second compartment of each tank includes openings for fluid communication with said suction cavity;    a hydraulic drive connected to the collection cavity, said hydraulic drive including a rod, a cylinder, and an operational fluid, said rod including a tail unit and an end portion; wherein extraction of said end portion from said cylinder creates suction against said membrane which draws said viscous liquid through said suction valve, and wherein insertion of said end portion back into said cylinder displaces said operational fluid, forcing said operational fluid against said membrane and which forces said viscous liquid through said forcing valve; and    a change lever mounted on said external pump casing for connecting to external pipes.    
   
   
       2 . The pump of  claim 1 , further comprising a fastening screw, wherein said change lever has at least one opening for said fastening screw and at least one slot for securing the tail unit of the rod; said tail unit including an annular groove to receive the fastening screw and including at least one overhang to engage said at least one slot.  
   
   
       3 . The pump of  claim 2 , further comprising a bearing plate affixed to said end portion, said bearing plate preventing exit of said rod from said cylinder.  
   
   
       4 . The pump of  claim 3 , wherein said bearing plate is a multi-lobe centering cam that allows fluid flow past said bearing plate.  
   
   
       5 . The pump of  claim 2 , further comprising a said sealing base of said rod where said rod enters said cylinder, said sealing base including sealing rings and the length of said sealing base extending equivalent to five times the diameter of said rod.  
   
   
       6 . The pump of  claim 1 , wherein said rod is dimensioned with respect to said cylinder to allow fluid flow between said rod and said cylinder.  
   
   
       7 . The pump of  claim 1 , further comprising hydro-pads between each of said tank and said membrane to ensure said membrane is not squeezed out through said openings.  
   
   
       8 . The pump of  claim 1 , wherein a geometry of said hydraulic drive is selected based on the size of said one or more tanks so as to prevent damage to said membrane due to said membrane being forced through said openings.  
   
   
       9 . The pump of  claim 8 , wherein said geometry is selected based further on the dimensions and maximum movement of said rod and temperature of said operating fluid.  
   
   
       10 . The pump of  claim 1 , further comprising branch pipes connecting each of said one or more tanks, said branch pipes including non-welded connections.