Static bilge pump

Abstract

A static bilge pump has a body surrounded by a shell, forming a motive plenum therebetween. Inlets in the front of the shell allow a motive fluid to enter the motive plenum. The motive plenum tapers, decreasing in cross-sectional area along with width as it moves toward its aft, and ends at a motive nozzle. The body houses a suction chamber in fluid communication with a suction inlet that is in fluid communication with the bilge of a boat. Ejectors are positioned proximal to and between the motive nozzle and the discharge outlet. When the static bilge pump is exposed to fluid flow from its front to its stern, such as when a boat is in motion, water enters the motive inlets, filling the motive Plenum and acting as a motive fluid. The motive fluid is ejected at high pressure from the motive nozzle, creating suction at the ejectors and discharging the motive fluid as well as liquid with in the suction chamber out the discharge outlet.

1 . A static bilge pump comprising:
 a body having a convex bottom and a top configured to life flush against a bottom of a boat hull;   and suction chamber in fluid communication with a suction inlet and one or more ejectors, wherein the one or more ejectors are located on the bottom of the body;   a convex shell having a front and a back and configured to fit over the bottom of the body, thereby forming a motive plenum between the body and the shell, and wherein the motive plenum tapers from the front of the shell to one or more motive nozzles positions at the back of the shell and proximal to the one or more ejectors of the body;   one or more motive inlets at the front of the convex shell providing fluid communication between the plenum and the region in front of the static bilge pump.   
     
     
         2 . The static bilge pump of  claim 1  further comprising a check valve that prevents fluid from flowing out of the suction chamber through the suction inlet. 
     
     
         3 . The static bilge pump of  claim 1  wherein the static bilge pump is affixed to the bottom of a boat hull and the suction inlet is in fluid communication with a bilge fluid collector in a bilge of the hull. 
     
     
         4 . The static bilge pump of  claim 3  wherein the suction inlet is in fluid communication with the bilge fluid collector by means of a transom adapter.