Piston tank with compound piston for high loading and expulsion efficiency
First Claim
1. A piston tank for ejecting a functional fluid in response to pressurization by an actuator fluid, said piston tank comprising:
- a cylindrical tank having an inner tank wall surface;
a barrier mounted to a carriage disposed within said cylindrical tank, said barrier and said carriage individually movable within said tank, said carriage having an axially elongated peripheral sealing surface sealed against said inner tank wall surface by a dynamic shear seal, and said barrier movable relative to said carriage in response to changes in pressure differential across said barrier; and
an actuator fluid inlet port and a functional fluid outlet port on opposing sides of said barrier.
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Accused Products
Abstract
A piston tank with elongated contact between the piston and the tank bore to prevent piston cocking and preserve alignment is equipped with a compound piston that includes a carriage (or glider) and a barrier that is movable relative to the carriage. The carriage is an elongate ring with sealing and contact sites between the ring and the tank bore and axially spaced apart, and the barrier moves or changes shape in response to pressure differentials across the barrier imposed by a pressurized driving fluid. The barrier and carriage can thus move between a position allowing the full volume of the tank to be occupied by fuel or other functional fluid and a position ejecting all of the fuel or functional fluid out of the tank through an outlet port. Two examples of the barrier are disclosed—a plate that is movable within the ring and a diaphragm affixed to the ring and deformable in both directions.
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Citations
10 Claims
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1. A piston tank for ejecting a functional fluid in response to pressurization by an actuator fluid, said piston tank comprising:
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a cylindrical tank having an inner tank wall surface; a barrier mounted to a carriage disposed within said cylindrical tank, said barrier and said carriage individually movable within said tank, said carriage having an axially elongated peripheral sealing surface sealed against said inner tank wall surface by a dynamic shear seal, and said barrier movable relative to said carriage in response to changes in pressure differential across said barrier; and an actuator fluid inlet port and a functional fluid outlet port on opposing sides of said barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification