Integral plus proportional dual pump switching system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-049/08
F04B-023/04
F04B-041/06
F02M-057/02
출원번호
US-0860971
(2010-08-23)
등록번호
US-8523537
(2013-09-03)
발명자
/ 주소
Garry, Michael P.
출원인 / 주소
Woodward, Inc.
대리인 / 주소
Reinhart Boerner Van Deuren P.C.
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
A dual-pump fluid distribution system that includes a first pump having an inlet and an outlet, and configured to supply a first flow of fluid, and a second pump having an inlet and an outlet, and configured to supply a second flow of fluid. In an embodiment, a bypass flow valve with a four-way hydr
A dual-pump fluid distribution system that includes a first pump having an inlet and an outlet, and configured to supply a first flow of fluid, and a second pump having an inlet and an outlet, and configured to supply a second flow of fluid. In an embodiment, a bypass flow valve with a four-way hydraulic bridge is configured to initiate the switch between single-pump mode and dual-pump mode based on fluid flow demand. The bypass flow valve is configured such that the position of the bypass flow valve member relative to the four-way hydraulic bridge operates a pump selector valve. In an embodiment, the pump selector valve has a valve member, a biasing element, and a pressure switching port, and is configured such that the position of the valve member determines whether the second flow of fluid is combined with the first flow of fluid.
대표청구항▼
1. A dual-pump fluid distribution system capable of switching between a single-pump mode and a dual-pump mode depending on a fluid flow demand, the dual-pump fluid distribution system comprising: a first pump having an inlet and an outlet, the first pump configured to supply a first flow of fluid;a
1. A dual-pump fluid distribution system capable of switching between a single-pump mode and a dual-pump mode depending on a fluid flow demand, the dual-pump fluid distribution system comprising: a first pump having an inlet and an outlet, the first pump configured to supply a first flow of fluid;a second pump having an inlet and an outlet, the second pump configured to supply a second flow of fluid; anda bypass flow valve having a valve member, a biasing element, and a four-way hydraulic bridge, the bypass flow valve configured to initiate the switch between single-pump mode and the dual-pump mode based on the fluid flow demand;wherein the bypass flow valve is configured such that a position of the bypass flow valve member relative to the four-way hydraulic bridge operates a pump selector valve; andwherein the pump selector valve has a valve member, a biasing element, and a pressure switching port, the pump selector valve configured such that a position of the pump selector valve member determines whether the second flow of fluid is combined with the first flow of fluid, and further comprising:a variable pressure regulator that includes a first port coupled to the second pump outlet, a second port coupled to the second pump inlet, and a third port directly coupled to the pump selector valve pressure switching port, anda actuation supply unit disposed between the second pump outlet and the pump selector valve, the actuation supply unit configured to provide a pressurized flow of fluid. 2. The dual-pump fluid distribution system of claim 1, further comprising a metering valve configured to sense a pressure differential between the first pump inlet and the first pump outlet, and further configured to maintain the pressure differential within a desired range. 3. The dual-pump fluid distribution system of claim 1, wherein a metering valve is configured to regulate a pressure differential between the first and second pump inlets and the first and second pump outlets by controlling a fluid flow through the metering valve, and by controlling a bypass flow from the first pump outlet through the bypass flow valve back to the first pump inlet. 4. The dual-pump fluid distribution system of claim 1, wherein the four-way hydraulic bridge comprises: a first port in the bypass flow valve coupled, via a first flow line, to a first port at a first end of the pump selector valve;a second port in the bypass flow valve coupled, via a second flow line, to a second port at a second end of the pump selector valve, the second end opposite the first end;a third port in the bypass flow valve coupled, via a third flow line, to a fourth port in the bypass flow valve;wherein the bypass flow valve member is configured to block one of the first and second ports to regulate an outlet pressure of the second pump. 5. The dual-pump fluid distribution system of claim 1, wherein the pressure switching port is configured to provide an override signal to the variable pressure regulator to maintain an outlet pressure for the second pump above an outlet pressure for the first pump. 6. The dual-pump fluid distribution system of claim 1, wherein the fluid distribution system is configured as a fuel distribution system aboard an aircraft. 7. The dual-pump fluid distribution system of claim 1, wherein the first and second pumps comprise fixed-positive displacement pumps. 8. The dual-pump fluid distribution system of claim 1, wherein the biasing elements are coil springs. 9. A method of supplying fluid using a fluid distribution system capable of alternating between a single-pump operation and a dual-pump-operation, the method comprising the steps of: operating the fluid distribution system in a single-pump mode when a flow demand can be satisfied using a first pump;operating the fluid distribution system in a dual-pump mode by adding a flow from a second pump to a flow of the first pump when the flow demand exceeds a capacity of the first pump to meet the flow demand;alternating between the single-pump mode and the dual-pump mode by sensing the flow demand based on a pressure at an outlet of the first pump, wherein sensing the flow demand based on the pressure at the outlet of the first pump comprises placing a bypass flow valve between the first pump outlet and a second pump outlet and a metering valve,wherein alternating between the single-pump mode and the dual-pump mode by sensing the flow demand based on the pressure at the outlet of the first pump further comprises providing the bypass flow valve with a four-way hydraulic bridge such that the bypass flow valve is configured to operate a pump selector valve to regulate an outlet pressure of the second pump,wherein operating the fluid distribution system comprises operating the fluid distribution system wherein an actuation supply unit is coupled between the second pump outlet and the pump selector valve, andwherein operating the fluid distribution system in the single-pump mode comprises positioning a pump selector valve member in the pump selector valve such that a flow path from the second pump outlet to the first pump outlet is directly blocked by the pump selector valve member, and wherein operating the fluid distribution system in the dual-pump mode comprises positioning the pump selector valve member such that the flow path from the second pump outlet to the first pump outlet is not blocked by the pump selector valve member. 10. The method of claim 9, further comprising configuring the metering valve to sense a pressure differential between a first pump inlet and the first pump outlet, and to control a flow rate out of the metering valve to maintain the pressure differential within a desired range. 11. The method of claim 9, wherein operating the fluid distribution system in the dual-pump mode comprises operating the fluid distribution system wherein the first and second pumps are fixed-positive displacement pumps. 12. The method of claim 11, wherein operating the fluid distribution system in the dual-pump mode further comprises providing a variable pressure regulator on a bypass line from the second pump outlet to a second pump inlet, wherein the variable pressure regulator is configured to control an outlet pressure of the second pump to maintain a minimum pressure required to meet the flow demand. 13. The method of claim 9, further comprising providing the actuation supply unit to provide pressurized fluid to a hydraulic device.
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이 특허에 인용된 특허 (6)
Markunas Albert L. (Roscoe IL), Dual pump controls.
Rannenberg George C. (Canton CT), Efficiency fluid pumping system including sequential unloading of a plurality of pumps by a single pressure responsive c.
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