# US 10,119,509 B2 · Multiple stage fuel pump

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- Number: US 10,119,509 B2
- Document ID: US10119509B2
- Status: Granted
- Kind: B2
- Application number: 14/930,312
- Filed: 2015-11-02
- Published: 2016-05-05
- Granted: 2018-11-06
- Earliest claimed: 2014-11-03
- Assignees: Coavis
- Applicants: Coavis
- Inventors: Gyu Sang Yu; Won Young Choi; In Seok Sohn
- Web page: https://patentgrep.com/patent/US10119509B2

## CPC

- F02M 59/16: characterised by having multi-stage compression of fuel
- F04D 5/006: {the stages being axially offset}
- F04D 13/0653: {the motor being flooded}
- F04D 15/0005: {by using valves}
- F04D 29/669: {especially adapted for liquid pumps (F04D29/18 takes precedence)}
- F04D 5/007: {Details of the inlet or outlet}
- F05D 2250/53: of regenerative pumps
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A multi-stage fuel pump includes a casing having a fuel intake formed on one side thereof and a fuel discharge port formed on the other side thereof, and a plurality of impellers provided within the casing, having a plurality of blades disposed on a circumferential surface in an outward direction of the circumferential surface and having blade chambers formed between the blades and penetrating through upper and lower surfaces of the impellers to allow fuel to be discharged and introduced to and from upper and lower sides of the blades, and formed in multiple stages, wherein fuel intaken through the fuel intake according to rotation of the impellers is discharged to the fuel discharge port through the blade chambers of the impellers, and the numbers of the blades of each of the impellers are different, thereby reducing blade passage frequency (BPF) noise generated according to rotation of the impellers.

## Claims

### Claim 1

A multi-stage fuel pump comprising:
a casing having a fuel intake formed on one side thereof and a fuel discharge port formed on the other side thereof; and
a plurality of impellers provided within the casing, having a plurality of blades disposed on a circumferential surface in an outward direction of the circumferential surface and having blade chambers formed between the blades and penetrating through upper and lower surfaces of the impellers to allow fuel to be discharged and introduced to and from upper and lower sides of the blades, and formed in multiple stages,
wherein a flow channel is formed such that fuel intaken through the fuel intake according to rotation of the impellers is discharged to the fuel discharge port through the blade chambers of the impellers, and
the numbers of the blades of each of the impellers are different,
wherein the casing comprises:
an upper casing having an upper flow channel recess formed on a lower surface thereof and allowing fuel to flow therein and the fuel discharge port connected to the upper flow channel recess and allowing fuel to be discharged by penetrating through upper and lower surfaces thereof;
an intermediate casing coupled to a lower side of the upper casing having an intermediate upper flow channel recess formed on an upper surface thereof and allowing fuel to flow therein and an intermediate lower flow channel recess formed on a lower surface thereof and allowing fuel to flow therein; and
a lower casing coupled to a lower side of the intermediate casing and having a lower flow channel recess formed on an upper surface thereof and allowing fuel to flow therein and the fuel intake connected to the lower flow channel recess and allowing fuel to flow by penetrating through upper and lower surfaces thereof,
wherein the impellers are provided in a space between the upper casing and the intermediate casing and a space between the intermediate casing and the lower casing, respectively,
wherein an intake flow channel is formed in the intermediate casing such that a fuel inlet side and the fuel intake of another impeller are connected through a fuel inlet side of one impeller; and
a discharge flow channel is formed in the upper casing and the intermediate casing such that each of fuel outlet sides of the impellers is connected to the fuel discharge port.

### Claim 2 (depends on 1)

The multi-stage fuel pump of claim 1, wherein the impellers are formed to have different outer diameters and have different numbers of blades, or are formed to have the same outer diameter and have different numbers of blades.