Claims:We Claim:
1. A supercharger (10) with an integrated gear pump, said integrated gear pump comprising:
a gear housing (18);
a cavity (16) defined within said gear housing (18), said cavity (16) adapted to house a first gear (20) and a second gear (22); characterized in that
an inlet (12) disposed in the gear housing (18), the inlet (12) adapted to channel fuel from a fuel tank to the cavity (16); and an outlet (14) disposed in the gear housing (18), the outlet (14) adapted to supply pressurized fuel from the cavity (16) of said integrated gear pump.

2. The supercharger (10) for the fuel injection system in accordance with Claim 1 wherein the inlet (12) is located between said first gear (20) and said second gear (22), said inlet (12) further orientated perpendicular to an axis of said first gear (20) and an axis of said second gear (22).

3. The supercharger (10) for the fuel injection system in accordance with Claim 2 wherein the outlet (14) is located between said first gear (20) and said at least said second gear (22), said outlet (14) further oriented perpendicular to the axis of said first gear (20) and the axis of said second gear (22), and wherein said outlet (14) is located opposite to said inlet (12).
, Description:Field of the invention
[0001] This invention relates to a pre-supply pump and more particularly to a pre-supply pump for a fuel injection system.
Background of the invention
[0002] US 2014196463 describes a gas turbine engine fuel supply system that includes a primary gear pump and a secondary gear pump. The primary gear pump always actively delivers fuel to the downstream fuel system, and is sized to supply 100 percent of the burn flow needed at a select low demand condition. The secondary gear pump is sized to make up the remainder of the flow at high demand conditions, and actively delivers fuel to the downstream fuel system only during those conditions. To supply discharge fuel pressures in excess of gear pump capability, a supercharger pump is disposed upstream of the primary and secondary gear pumps. The supercharger pump is preferably activated only during high demand conditions as an additional energy conservation measure.
Brief description of the accompanying drawing
[0003] Figure 1 illustrates a schematic diagram of a gear pump arrangement of a supercharger.
Detailed description of the invention
[0004] A supercharger 10 with an integrated gear pump is described. The supercharger 10 comprises a gear housing 18 and a cavity 16 defined within the gear housing 18, the cavity 16 adapted to house a first gear 20 and a second gear 22. An inlet 12 is disposed in the gear housing 18, the inlet 12 adapted to channel fuel from a fuel tank to the cavity 16. An outlet 14 is disposed in the gear housing 18, the outlet 14 adapted to supply pressurized fuel from the cavity 16 of the supercharger 10.
[0005] Figure 1 illustrates a schematic diagram of a gear pump arrangement of a supercharger 10. The supercharger 10 comprises a gear pump arrangement provided on one portion of the supercharger 10. The gear pump arrangement comprises a gear housing 18. A cavity 16 is defined within the gear housing 18. The cavity 16 comprises a first gear 20 and a second gear 22 that are each positioned within the cavity 16.
[0006] The supercharger 10 comprises an inlet 12 that is disposed in the gear housing 18. The inlet 12 extends from an outer portion of the gear housing 18 to an inner portion of the gear housing 18, and channels fuel from a fuel tank to the cavity 16 of the gear housing 18.The inlet 12 is located between the first gear 20 and the second gear 22, the inlet 12 further orientated perpendicular to an axis of the first gear 20 and an axis of the second gear 22. More specifically, fuel is channeled from the outer portion of the gear housing 18 to the inner portion of the gear housing 18 due to the suction created by the rotation of the first gear 20 and the second gear 22. Fuel that is channeled into the cavity 16 of the gear housing 18 flows between the first gear 20 and a wall of the gear housing 18, and the second gear 22 and the wall of the gear housing 18 and therefore gets pressurized. Pressurized fuel from the cavity 16 of the gear housing 18 flows to the outlet 14 of the supercharger 10. From the outlet 14 of the supercharger 10, the fuel is delivered to a high pressure fuel pump before it is finally delivered to an engine. The outlet 14 is located between the first gear 20 and the second gear 22. The outlet 14 is further oriented perpendicular to the axis of the first gear 20 and the axis of the second gear 22. The outlet 14 is located opposite to the inlet 12 of the supercharger 10. The clearance defined between the first gear 20, the second gear 22 and the inner wall of the gear housing 18 is manufactured to tight tolerances to facilitate pressurizing fuel that is delivered from the super charger 10 to the maximum possible extent.
[0007] The working principle of the integrated gear chamber of the supercharger 10 is described as an example. Fuel flows from a fuel tank to the cavity 16 of the gear housing 18 due to the suction created by the rotation of the first gear 20 and the second gear 22. Due to the rotation of the first gear 20 and the second gear 22, fuel is channeled through the clearance defined between the first gear 20, the second gear 22, and the outer portion of the gear housing 18 where it gets pressurized. Pressurized fuel is delivered from the outlet 14 of the supercharger 10 from where it is supplied to a high pressure fuel pump. In the exemplary embodiment, the outlet 14 is defined opposite to the inlet 12 of the supercharger 10.
[0008] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to leverage and dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the claims.