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US 12,742,443 B1Granted
Apparatus for delivering metered fluid at elevated pressure
AssigneePrince Sattam Bin Abdulaziz University
InventorsMohamed Mohamed Zaky Ahmed, Mohamed Elashmawy
Life of this patent
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Abstract
An apparatus for delivering fluid at elevated pressure includes a pressure vessel to store pressurized air and a liquid, a piston assembly including a first piston movable within a first cylinder and a second piston movable within a second cylinder. The first piston and the second piston are connected through a common shaft. A control valve to selectively connect the pressure vessel or a liquid reservoir to the first cylinder. A delivery check valve and a suction check valve connected to the second cylinder to control fluid flow during operation. The apparatus operates in a repeating cycle including a delivery mode and a suction mode.
Claims20
An apparatus for delivering metered fluid at elevated pressure, comprising:
- a first fluid circuit associated with a first liquid, the first fluid circuit comprising:
- a first liquid reservoir, configured to store the first liquid,
- a pump, configured to draw the first liquid from the first liquid reservoir,
- a pressure vessel, configured to contain a trapped volume of air and use the trapped volume of air to pressurize the first liquid within the pressure vessel,
- a one-way valve, fluidly connecting the pump to the pressure vessel and configured to permit flow of the first liquid from the pump to the pressure vessel,
- a first cylinder, and
- a control valve, fluidly coupled to the pressure vessel, the first liquid reservoir, and the first cylinder, the control valve being configured to:
- (1) in a delivery mode, connect the pressure vessel to the first cylinder to deliver the first liquid pressurized by the pressure vessel to the first cylinder, and (2) in a suction mode, connect the first cylinder to the first liquid reservoir to permit return flow of the first liquid from the first cylinder to the first liquid reservoir;
- a second fluid circuit associated with a second liquid, the second fluid circuit comprising:
- a second liquid reservoir, configured to store the second liquid,
- a second cylinder,
- a suction check valve, fluidly connecting the second liquid reservoir to the second cylinder and configured to permit flow of the second liquid from the second liquid reservoir into the second cylinder during the suction mode,
- a delivery conduit, and
- a delivery check valve, fluidly connecting the second cylinder to the delivery conduit and configured to permit metered flow of the second liquid from the second cylinder to the delivery conduit during the delivery mode;
- and
- a piston assembly comprising:
- a first piston movable within the first cylinder,
- a second piston movable within the second cylinder,
- a common shaft mechanically coupling the first piston and the second piston such that movement of the first piston in a first direction during the delivery mode causes corresponding movement of the second piston in the first direction,
- an adjustable stroke stopper, configured to limit a range of movement of the first piston and the second piston to control a metered volume of the second liquid delivered during the delivery mode, and
- a return biasing member coupled to the first piston and the second piston and configured to move the first piston and the second piston in a second direction opposite to the first direction during the suction mode,
- wherein the first piston comprises a piston head area larger than a piston head area of the second piston,
- wherein the control valve is a three-way valve actuated according to a timed sequence to switch the apparatus between the delivery mode and the suction mode,
- wherein in the delivery mode the metered second liquid is delivered from the second cylinder through the delivery check valve to the delivery conduit at an elevated pressure corresponding to a pressure of the first liquid acting on the first piston multiplied by a ratio of the piston head area of the first piston to the piston head area of the second piston, and
- wherein in the suction mode, the second liquid is drawn from the second liquid reservoir through the suction check valve into the second cylinder.
22 more elements
A method for delivering metered fluid at elevated pressure using an apparatus, comprising:
- providing a first fluid circuit associated with a first liquid, the first fluid circuit comprising:
- a first liquid reservoir, configured to store the first liquid,
- a pump, configured to draw the first liquid from the first liquid reservoir,
- a pressure vessel, configured to contain a trapped volume of air and use the trapped volume of air to pressurize the first liquid within the pressure vessel,
- a one-way valve, fluidly connecting the pump to the pressure vessel and configured to permit flow of the first liquid from the pump to the pressure vessel,
- a first cylinder, and
- a control valve, fluidly coupled to the pressure vessel, the first liquid reservoir, and the first cylinder, the control valve being configured to:
- (1) in a delivery mode, connect the pressure vessel to the first cylinder to deliver the first liquid pressurized by the pressure vessel to the first cylinder, and (2) in a suction mode, connect the first cylinder to the first liquid reservoir to permit return flow of the first liquid from the first cylinder to the first liquid reservoir;
- providing a second fluid circuit associated with a second liquid, the second fluid circuit comprising:
- a second liquid reservoir, configured to store the second liquid,
- a second cylinder,
- a suction check valve, fluidly connecting the second liquid reservoir to the second cylinder and configured to permit flow of the second liquid from the second liquid reservoir into the second cylinder during the suction mode,
- a delivery conduit, and
- a delivery check valve, fluidly connecting the second cylinder to the delivery conduit and configured to permit metered flow of the second liquid from the second cylinder to the delivery conduit during the delivery mode;
- and
- providing a piston assembly comprising:
- a first piston movable within the first cylinder,
- a second piston movable within the second cylinder,
- a common shaft mechanically coupling the first piston and the second piston such that movement of the first piston in a first direction during the delivery mode causes corresponding movement of the second piston in the first direction,
- an adjustable stroke stopper, configured to limit a range of movement of the first piston and the second piston to control a metered volume of the second liquid delivered during the delivery mode, and
- a return biasing member coupled to the first piston and the second piston and configured to move the first piston and the second piston in a second direction opposite to the first direction during the suction mode,
- wherein the first piston comprises a piston head area larger than a piston head area of the second piston,
- wherein the control valve is a three-way valve actuated according to a timed sequence to switch the apparatus between the delivery mode and the suction mode,
- wherein in the delivery mode, the metered second liquid is delivered from the second cylinder through the delivery check valve to the delivery conduit at an elevated pressure corresponding to a pressure of the first liquid acting on the first piston multiplied by a ratio of the piston head area of the first piston to the piston head area of the second piston, and
- wherein in the suction mode, the second liquid is drawn from the second liquid reservoir through the suction check valve into the second cylinder.
22 more elements
Dependencies are inferred from the claim text.