# US 2021/0277902 A1 · Regenerative pump start and actuation stage for high-speed centrifugal fuel pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277902 A1 - Document ID: US20210277902A1 - Status: Published application - Kind: A1 - Application number: 17/192,458 - Filed: 2021-03-04 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: Eaton Intelligent Power Limited - Applicants: Eaton Intelligent Power Limited - Inventors: Cody M. Mackey; Martin A. Clements - Web page: https://patentgrep.com/patent/US20210277902A1 ## CPC - F04D 1/02: having non-centrifugal stages, e.g. centripetal - F04D 5/003: {of multistage type} - F02C 7/236: Fuel delivery systems comprising two or more pumps - F02C 9/28: Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed (F02C9/30 - F02C9/38, F02C9/44 take precedence) - F04D 5/002: {Regenerative pumps (for elastic fluids F04D23/008)} - F04D 5/007: {Details of the inlet or outlet} - F04D 15/0005: {by using valves} - F04D 15/0072: {Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) ## Abstract A fuel pump system (100) and associated method for supplying fuel from an associated fluid source (112) to an associated downstream use (102, 104) including for engine (i) start mode, (ii) run mode, and (iii) actuation mode are disclosed. The system has a pump (110) including a primary stage (116) having an inlet (114), and an outlet (120) that is configured to selectively supply pressurized flow for the (ii) run mode, and a regenerative stage (130) commonly driven with the primary stage to selectively provide pressurized fluid for the (i) start mode and the (iii) actuation mode. ## Claims ### Claim 1 A fuel pump system for supplying fuel from an associated fluid source to an associated downstream use(s) including for engine (i) start mode, (ii) run mode, and (iii) actuation mode, the system comprising: a pump including a primary stage having an inlet and an outlet that is configured to selectively supply pressurized flow for the (ii) run mode; and a regenerative stage commonly driven with the primary stage to selectively provide pressurized fluid for the (i) start mode and the (iii) actuation mode. ### Claim 2 (depends on 1) The fuel pump system of claim 1 further comprising a control valve, a regenerative stage control valve, and a pressure regulator valve, the control valve in communication with the primary stage for controlling operation thereof. ### Claim 3 (depends on 2) The fuel pump system of claim 2 wherein the control valve is in communication with the pressure regulator valve to selectively control fluid flow to the regenerative stage. ### Claim 4 (canceled) ### Claim 5 (canceled) ### Claim 6 (depends on 2) The fuel pump system of claim 2 wherein the pressure regulator valve and the regenerative stage control valve are both open during the (i) start mode. ### Claim 7 (depends on 2) The fuel pump system of claim 2 wherein the pressure regulator valve and the regenerative stage control valve are both closed during the (ii) run mode. ### Claim 8 (depends on 2) The fuel pump system of claim 2 wherein the pressure regulator valve is open and the regenerative stage control valve is closed during the (iii) actuation mode. ### Claim 9 (depends on 2) The fuel pump system of claim 2 further comprising a first check valve downstream of the primary stage outlet. ### Claim 10 (canceled) ### Claim 11 (canceled) ### Claim 12 (depends on 2) The fuel pump system of claim 2 further comprising a second check valve downstream of the regenerative stage. ### Claim 13 (canceled) ### Claim 14 (canceled) ### Claim 15 (depends on 2) The fuel pump system of claim 2 further comprising a third check valve downstream of both the primary stage and the regenerative stage. ### Claim 16 (canceled) ### Claim 17 (canceled) ### Claim 18 (depends on 2) The fuel pump system of claim 2 further comprising a control valve, a regenerative stage control valve, and a pressure regulator valve, the control valve in communication with the primary stage for controlling operation thereof, the control valve in communication with the (b) pressure regulator valve to selectively control fluid flow to the regenerative stage, the regenerative stage control valve selectively controlling fluid flow from the regenerative stage for the (i) start mode, and the regenerative stage control valve in fluid communication with the outlet of the primary stage such that the regenerative stage control valve selectively closes in response to a preselected pressure at the primary stage outlet. ### Claim 19 (canceled) ### Claim 20 A fuel pump system for supplying fuel from an associated fluid source to an associated downstream use(s) including for engine (i) start mode, (ii) run mode, and (iii) actuation mode, the system comprising: a pump including a primary stage having an inlet, a centrifugal pump stage having an impeller, and an outlet that is configured to selectively supply pressurized flow for the (ii) run mode; and a rotary member stage commonly driven with the centrifugal pump to selectively provide pressurized fluid for the (i) start mode and the (iii) actuation mode. ### Claim 21 (depends on 1) The fuel pump system of claim 1 further comprising a rotary member control valve, and a pressure regulator valve, and control valve in communication with the centrifugal pump for controlling operation thereof. ### Claim 22 A method of supplying fuel from an associated fluid source to an associated downstream use(s) including for engine (i) start mode, (ii) run mode, and (iii) actuation mode, the method comprising: selectively supplying pressurized flow for the (ii) run mode with a pump including a primary stage having an inlet and an outlet that is configured to selectively supply pressurized flow for the (ii) run mode; and selectively providing pressurized fluid for the (i) start mode and the (iii) actuation mode with a regenerative stage commonly driven with the primary stage. ### Claim 23 (depends on 22) The method of claim 22 further comprising providing a regenerative stage control valve, a pressure regulator valve, and a control valve controlling operation of the primary stage. ### Claim 24 (depends on 23) The method of claim 23 further comprising communicating the control valve with the pressure regulator valve, and selectively controlling fluid flow to the regenerative stage. ### Claim 25 (canceled) ### Claim 26 (canceled) ### Claim 27 (depends on 23) The method of claim 23 further comprising opening the pressure regulator valve and the regenerative stage control valve during the (i) start mode. ### Claim 28 (depends on 23) The method of claim 23 further comprising closing the pressure regulator valve and the regenerative stage control valve during the (ii) run mode. ### Claim 29 (depends on 23) The method of claim 23 further comprising opening the pressure regulator valve and closing the regenerative stage control valve during the (iii) actuation mode. ### Claim 30 (depends on 23) The method of claim 23 further comprising locating a first check valve downstream of the primary stage outlet. ### Claim 31 (canceled) ### Claim 32 (canceled) ### Claim 33 (depends on 23) The method of claim 23 further comprising locating a second check valve downstream of the regenerative stage. ### Claim 34 (canceled) ### Claim 35 (canceled) ### Claim 36 (depends on 23) The method of claim 23 further comprising locating a third check valve downstream of both the primary stage and the regenerative stage. ### Claim 37 (canceled) ### Claim 38 (canceled) ### Claim 39 (depends on 23) The method of claim 23 further comprising providing a regenerative stage control valve, a pressure regulator valve, and a control valve in communication with the primary stage, and controlling operation of the primary stage with the control valve, and selectively controlling fluid flow to the regenerative stage, the regenerative stage control valve selectively controlling fluid flow from the regenerative stage with the pressure regulator valve the (i) start mode, and selectively closing the regenerative stage control valve with the outlet of the primary stage such that the regenerative stage control valve selectively closes in response to a preselected pressure at the primary stage outlet. ### Claim 40 (canceled)