초록 ▼

The present invention relates to a jet pump having a first inlet duct, a second inlet duct and an outlet duct having an outlet end, wherein the ducts are in fluid communication with each other at a central volume portion. The jet pump also includes a sleeve formed with a closed end at the bottom and

The present invention relates to a jet pump having a first inlet duct, a second inlet duct and an outlet duct having an outlet end, wherein the ducts are in fluid communication with each other at a central volume portion. The jet pump also includes a sleeve formed with a closed end at the bottom and partially enclosing said outlet duct. The sleeve has a lateral opening therein at a predetermined height above the outlet end of said outlet duct. A continuous flowpath with different flow directions is also present within the sleeve along the inner and outer surfaces of said outlet duct towards the lateral opening. The jet pump can be advantageously used in fuel delivery system with saddle fuel tanks.

대표청구항 ▼

What is claimed is: 1. A fuel delivery system for a vehicle equipped with an engine comprising: a saddle fuel tank having an active side and a passive side; a reservoir installed into the active side of the fuel tank, the reservoir having a check-valve in its bottom and a spillway on its top; a fu

What is claimed is: 1. A fuel delivery system for a vehicle equipped with an engine comprising: a saddle fuel tank having an active side and a passive side; a reservoir installed into the active side of the fuel tank, the reservoir having a check-valve in its bottom and a spillway on its top; a fuel pump mounted in the reservoir, the fuel pump having an inlet and an outlet: a fuel diverter In the form of a T-valve having an inlet in fluid communication with the outlet of the fuel pump, a first outlet, and a second outlet in fluid communication with the engine; a jet pump mounted to the reservoir, wherein the jet pump having a first inlet duct having an orifice, the first inlet duct being in fluid communication with the first outlet of the fuel diverter; the jet pump having a second inlet duct in fluid communication with the passive side of the saddle fuel tank; and the jet pump having an outlet duct provided with an outlet end, the outlet being in fluid communication with the inside of the reservoir; and a fuel delivery hose having an Inlet located within the passive side of the saddle fuel tank and an outlet connected to the second inlet duct of the jet pump; the jet pump having a sleeve formed with a closed end at the bottom and partially enclosing the outlet duct, the sleeve including a lateral opening therein at a predetermined height above the outlet end of the outlet duct. 2. The fuel delivery system according to claim 1, wherein the inner diameter of the orifice in the jet pump is in the range of 0.4-0.5 mm. 3. A fuel delivery system for a vehicle equipped with an engine, comprising: a saddle fuel tank having an active side and a passive side; a reservoir installed into the active side of the fuel tank, the reservoir having a check-valve in its bottom and a spillway on its top; a fuel pump mounted in the reservoir, the fuel pump having an inlet and an outlet; a conduit providing fluid communication between the fuel pump and the engine, said conduit having a first end and a second end, said first end being connected to the outlet of the fuel pump and the second end being connected to the engine; a return supply tube having a first end and a second end, the first end of the return supply tube being connected to the engine; a jet pump mounted to the reservoir, wherein the jet pump having a first inlet duct having an orifice, the duct being connected to the second end of the return supply tube, the jet pump having a second inlet duct in fluid communication with the passive side of the saddle fuel tank, and the jet pump having an outlet duct provided with an outlet end, the duct being in fluid communication with the inside of the reservoir, and a fuel delivery hose having an inlet located within the passive side of the saddle fuel tank and an outlet connected to the second inlet duct of the jet pump; the jet pump having a sleeve formed with a closed end at the bottom and partially enclosing the outlet duct, the sleeve including a lateral opening therein at a predetermined height above the outlet end of the outlet duct. 4. The fuel delivery system according to claim 3, wherein the engine is a diesel oil operated engine, and tile inner diameter of the critics in the jet pump is In the range of 2.0-2.5 mm. 5. A jet pump with improved start-up properties comprising: a pump body having a first inlet duct, a second inlet duct, and an outlet duct, said ducts defining respective hollow interiors communicating with each other at a mixing portion; the hollow interior of said outlet duet defines a diffusing portion having an increasing inner cross-section away from the mixing portion and having an outlet end; the first inlet duct includes an inlet end communicating with a nozzle portion having a decreasing inner cross-section towards the mixing portion and defining an orifice opening towards the mixing portion; the second inlet duct is arranged at an angle relative to the first inlet and outlet ducts; a sleeve at least partially covering and arranged around the outlet duct, the sleeve having an open end, a closed end, a solid wall and at least one lateral opening defined through the wall between the open and closed ends; the outlet end of the outlet duct being located deeper in the sleeve than the lateral opening, whereby a continuous flowpath with different flow directions is formed within the sleeve along the inner and outer surfaces of the outlet duct towards the lateral opening; and wherein said opening is made in the form of a slot in the wall of the sleeve. 6. A jet pump with improved start-up properties comprising: a pump body having a first inlet duct, a second inlet duct and an outlet duct, said ducts defining respective hollow interiors communicating with each other at a mixing portion; the hollow interior of said outlet duct defines a diffusing portion having an increasing inner cross-section away from the mixing portion and having an outlet end; the first inlet duct Includes an inlet end communicating with a nozzle portion having a decreasing inner cross-section towards the mixing portion and defining an orifice opening towards the mixing portion; the second inlet duct is arranged at an angle relative to the first inlet and outlet ducts; a sleeve at least partially covering and arranged around the outlet duct, the sleeve having an open end, a closed end, a solid wall and at least one lateral opening defined through the wall between the open and closed ends; and the outlet end of the outlet duct being located deeper in the sleeve than the lateral opening, whereby a continuous flowpath with different flow directions is formed within the sleeve along the inner and outer surfaces of the outlet duct towards the lateral opening; wherein the open end of the sleeve is provided with a rim, and wherein the outlet duct is provided with a flange on its outer surface to bear against the rim of the open end for controlling the depth of insertion of the outlet duct into the sleeve. 7. A jet pump with improved start-up properties comprising: a pump body having a first inlet duct, a second inlet duct and an outlet duct, said ducts defining respective hollow interiors communicating with each other at a mixing portion; the hollow interior of said outlet duct defines a diffusing portion having an increasing inner cross-section away from the mixing portion and having an outlet end; the first inlet duct includes an inlet end communicating with a nozzle portion having a decreasing inner cross-section towards the mixing portion and defining an orifice opening towards the mixing portion; the second inlet duct is arranged at an angle relative to the first inlet and outlet ducts; a sleeve at least partially covering and arranged around the outlet duct, the sleeve having an open end, a closed end, a solid wall and at least one lateral opening defined through the wall between the open and closed ends; and the outlet end of the outlet duct being located deeper in the sleeve than the lateral opening, whereby a continuous flowpath with different flow directions is formed within the sleeve along the inner and outer surfaces of the outlet duct towards the lateral opening; wherein at least one fixing tab fitting into a groove formed in the wall of the sleeve is present on the outer surface of the outlet duct for preventing swivel of the pump body within the sleeve around said axis. 8. The jet pump according to claim 5, wherein the sleeve and the cutlet duct have a common axis. 9. The jet pump according to claim 5, wherein the slot extends generally parallel with said axis from the open end of the sleeve towards the closed end thereof. 10. The jet pump according the claim 9, wherein the slot extends parallel to an axis, the axis being a common axis between the sleeve and the outlet duct. 11. The jet pump according to claim 5, wherein the outlet duct and the inner surface of the sleeve are spaced apart along the flowpath. 12. The jet pump according to claim 5, wherein it comprises fastening means for a firm installation. 13. The jet pump according to claim 5, wherein the first inlet duct and the outlet duct have a common axis.