Abstract:
The invention relates to a method for the production of a bladder accumulator (10) which separates two media chambers (16, 18) from one another in a storage housing (12) by means of a bladder body (14), comprising at least the following production steps:—extruding a plastic tube over the bladder body (14);—shaping the plastic tube with the integrated bladder body (14) in a molding tool that corresponds to a predeterminable plastic core container (20), and—winding at least one plastic fiber from the outside on the plastic core container (20) for the purpose of creating the storage housing (12).
Abstract:
A pulsation control device is constructed at least partially of a composite carbon (and/or other fibers)/epoxy exostructure having an oblong cylindrical or spheroidal shape, optionally with metallic portions or reinforcements, together with a non-metallic polymer non-load sharing liner. A pressure drop tube preferably extends from an opening through an exterior wall of the body into an interior space within the body.
Abstract:
A microfluidic valve assembly includes a structure defining a microfluidic fluid path and an actuator that can be moved between different positions controlling flow through the channel. In one embodiment, the actuator can be threaded into at least a portion of the structure, and can be moved rotationally between a first position, causing relatively greater constriction of a microfluidic fluid path, and a second position causing relatively lesser constriction of the fluid path. Actuating the actuator, e.g., by rotation, can deform material between the valve and the fluid path, thereby constricting at least a portion of the underlying fluid path and regulating the flow of a fluid in the fluid path. In another aspect, the invention provides a reservoir into which fluid can be placed and from which fluid can be introduced into a microfluidic system. In one embodiment, the reservoir is expandable and thereby able to store fluid under pressure for delivery to a microfluidic system.
Abstract:
A hydraulic accumulator comprises a pressure shell, a bladder, and a rod. The pressure shell is filament wound around a leak proof barrier/mold. The bladder is tubular and carried by the rod. The rod extends though the pressure shell and seals to the ends of the shell. The shell has a first generally cylindrical section positioned at the first end and a second generally cylindrical section positioned at the second end. A third generally cylindrical mid section is positioned between the first end and the second end. A first generally frustoconical section connects the first end section to the mid section and a second generally frustoconical section connects the second end section to the mid section. The bladder is tubular and expandable. A first chamber having an annular cross section for gas is formed between the rod and the bladder. A second chamber having an annular cross section for liquid is is formed between the bladder and the shell. A first flow passage is formed through an end seal means communicating with the first chamber. A second flow passage is formed though an end seal means communicating with the second chamber.
Abstract:
The invention is an accumulator which stores energy by deforming from its original shape in response to the flow of a pressurized fluid. The stored energy is returned when the fluid flow is reversed and the accumulator returns to its original shape. At least one part of the novelty of the accumulator is that it captures elastic strain energy of a stretched bladder, as opposed to relying on gases and metals for energy storage as is usually seen in conventional accumulators.
Abstract:
A piston accumulator includes a housing having a housing wall and a piston disposed in the housing. The housing wall and the piston form a pressure chamber. The piston is slidably moveable along the housing wall so as to change a volume of the pressure chamber. A slide layer disposed on at least one of the piston and the housing wall is configured to guide the piston free of guide rings.
Abstract:
An accumulator for a hydraulic system, wherein the accumulator comprises a liner, a piston and a housing, that defines a pressure chamber, for receiving hydraulic fluid at high pressure, wherein the piston is biased towards an end position of the pressure chamber for interacting with the hydraulic fluid in the pressure chamber, and the piston is movable in a predetermined range for accumulating hydraulic fluid. The accumulator has at least one outlet port in a sidewall of the liner, which outlet port is covered by the piston in the predetermined range and is uncovered when the piston has moved a predetermined distance from the end position. A hydraulic system is also provided that comprises the above accumulator and an all-wheel drive system comprising the above hydraulic system. A method for de-airing an accumulator according to above is also provided.
Abstract:
An impedance shaping element (or more simply, an impedance shaper) physically alters or shapes the mechanical impedance of a drive system as it appears from an interface and facilitates use of feedback control to improve performance by altering or shaping a dynamic coupling between an interface and a control system. For example, the impedance shaper can be used to adjust a coupling value from a first value to a second different value. In one embodiment, an impedance shaper controls the compliance, damping and inertia characteristics of fluid within a fluid path.
Abstract:
A fluid transmission system adapted to provide a controlled force to a dynamic system includes a controller, a drive system coupled to the controller and to a path having a captured amount (mass) of fluid contained therein and an interface coupled to the captured fluid path.
Abstract:
A gas-oil pressure accumulator having a load-bearing structure of composite material, suitable for aircraft hydraulic circuits. The accumulator is formed of a cylindrical body with closed ends, at least one of which is composed of a convex cap. A piston slideable in the cylindrical body defines two chambers, one adapted for containing hydraulic oil and the other adapted for containing gas under pressure. The walls subjected to internal pressure are formed with an internal core of metallic material of small thickness, and are provided with a facing of composite material, composed of high-strength fibres impregnated with synthetic resin, adapted for resisting the loads due to the pressure, which facing of composite material extends at least over one of the end caps of the cylindrical body, the winding of the fibers being continuous and without the superposition of consecutive turns in any one layer of turns, with winding angles differing from the angles corresponding to the equilibrium path of the stresses on the surface of the cylindrical body itself.