Jet pump

Abstract

A jet pump comprises a HP inlet vent, a nozzle connected to the HP inlet vent via a HP fluid conduit and configured to discharge a first fluid flowing through the HP inlet into a nozzle discharge zone, a LP inlet vent, a LP fluid conduit connected to the LP inlet vent and configured to discharge a second fluid flowing through the LP inlet vent into the nozzle discharge zone. A mixing tube is provided downstream of the nozzle discharge zone for mixing the first and second fluids and an outlet vent is located downstream of the mixing tube for discharging a mixture of the first and second fluids from the jet pump. The jet pump includes a spinner mechanism upstream of the nozzle discharge zone for causing spinning rotation of at least one of the first and second fluids about a longitudinal axis of the nozzle. In one embodiment the spinner mechanism includes a LP inlet chamber connected to receive the second fluid from the LP fluid conduit, the LP inlet chamber comprising a fluid passageway that extends circumferentially around the nozzle to cause rotation of the second fluid around the longitudinal axis of the nozzle.

1 . A jet pump including a HP inlet vent, a nozzle connected to the HP inlet vent via a HP fluid conduit and configured to discharge a first fluid flowing through the HP inlet into a nozzle discharge zone, a LP inlet vent, a LP fluid conduit connected to the LP inlet vent and configured to discharge a second fluid flowing through the LP inlet vent into the nozzle discharge zone, a mixing tube downstream of the nozzle discharge zone for mixing the first and second fluids and an outlet vent downstream of the mixing tube for discharging a mixture of the first and second fluids from the jet pump, wherein the jet pump includes a spinner mechanism upstream of the nozzle discharge zone for causing spinning rotation of at least one of the first and second fluids about a longitudinal axis of the nozzle. 
     
     
         2 . A jet pump according to  claim 1 , wherein the spinner mechanism includes a LP inlet chamber connected to receive the second fluid from the LP fluid conduit, the LP inlet chamber comprising a fluid passageway that extends circumferentially around the nozzle to cause rotation of the second fluid around the longitudinal axis of the nozzle. 
     
     
         3 . A jet pump according to  claim 2 , wherein the LP inlet chamber includes a curved wall that extends at least partly around the nozzle. 
     
     
         4 . A jet pump according to  claim 3 , wherein the LP inlet chamber is substantially involute in shape. 
     
     
         5 . A jet pump according to  claim 3 , wherein the LP inlet chamber is substantially cylindrical in shape. 
     
     
         6 . A jet pump according to  claim 2 , wherein the LP inlet chamber has a tangential inlet port connected to the LP inlet vent. 
     
     
         7 . A jet pump according to  claim 2 , wherein the LP inlet chamber comprises an annular outlet port configured to discharge the second fluid into the nozzle discharge zone. 
     
     
         8 . A jet pump according to  claim 1 , wherein the spinner mechanism includes a static spinner device located within the HP fluid conduit, which is configured to cause rotation of the first fluid around the longitudinal axis of the nozzle. 
     
     
         9 . A jet pump according to  claim 8 , wherein the static spinner device includes at least one helical blade configured to cause rotation of the first fluid as it flows through the HP fluid conduit. 
     
     
         10 . A jet pump according to  claim 3 , wherein the LP inlet chamber has a tangential inlet port connected to the LP inlet vent. 
     
     
         11 . A jet pump according to  claim 4 , wherein the LP inlet chamber has a tangential inlet port connected to the LP inlet vent. 
     
     
         12 . A jet pump according to  claim 5 , wherein the LP inlet chamber has a tangential inlet port connected to the LP inlet vent. 
     
     
         13 . A jet pump according to  claim 3 , wherein the LP inlet chamber comprises an annular outlet port configured to discharge the second fluid into the nozzle discharge zone. 
     
     
         14 . A jet pump according to  claim 4 , wherein the LP inlet chamber comprises an annular outlet port configured to discharge the second fluid into the nozzle discharge zone. 
     
     
         15 . A jet pump according to  claim 5 , wherein the LP inlet chamber comprises an annular outlet port configured to discharge the second fluid into the nozzle discharge zone. 
     
     
         16 . A jet pump according to  claim 6 , wherein the LP inlet chamber comprises an annular outlet port configured to discharge the second fluid into the nozzle discharge zone. 
     
     
         17 . A jet pump according to  claim 2 , wherein the spinner mechanism includes a static spinner device located within the HP fluid conduit, which is configured to cause rotation of the first fluid around the longitudinal axis of the nozzle. 
     
     
         18 . A jet pump according to  claim 3 , wherein the spinner mechanism includes a static spinner device located within the HP fluid conduit, which is configured to cause rotation of the first fluid around the longitudinal axis of the nozzle. 
     
     
         19 . A jet pump according to  claim 4 , wherein the spinner mechanism includes a static spinner device located within the HP fluid conduit, which is configured to cause rotation of the first fluid around the longitudinal axis of the nozzle. 
     
     
         20 . A jet pump according to  claim 5 , wherein the spinner mechanism includes a static spinner device located within the HP fluid conduit, which is configured to cause rotation of the first fluid around the longitudinal axis of the nozzle.