Device for burst pipe safety
AssigneeAirbus Operations GmbH
InventorJuergen Laude
Life of this patent
Estimating the term…
Abstract
A device for the protection against the rupture of pipes carrying a fluid includes two or more flow channels and a closing element which interrupts the flow of fluid if a predetermined permissible volume flow is exceeded. At least one of the flow channels can be closed by a test closure in order to increase the flow speed in the remaining flow channels and for test purposes to bring about a movement of the closing element into the closing position. In this way, devices for the protection against the rupture of pipes integrated into complex systems carrying a fluid can be tested in situ to verify their proper functioning.
Claims13
A hydraulic fuse, comprising:
- a housing with an inflow and an outflow;
- a closing element mounted in a movable manner in the housing with a front face facing the inflow and a closing surface facing the outflow;
- at least two flow channels extending from the inflow to the outflow;
- at least one orifice, arranged in the flow channels to create a pressure drop in a fluid flowing from the inflow to the outflow;
- and
- at least one retainer element arranged between the outflow and the closing element;
- wherein an inflow pressure of the fluid at the inflow acts on the front face of the closing element and an outflow pressure of the fluid at the outflow acts on the closing surface of the closing element;
- wherein the retainer element is dimensioned in such a way that, at a predetermined minimum difference between the inflow pressure and the outflow pressure, the closing element moves against a retaining force from the retainer element towards the outflow into a closing position;
- and
- wherein the hydraulic fuse further comprises at least one test closure for in-situ testing of the hydraulic fuse, the at least one test closure biased in an opening position, and the at least one test closure closes at least one of the flow channels in a closing position, so that the flow speed in the other flow channels is increased, the pressure drop through the orifice increases, and a movement of the closing element is thus induced.
An aircraft comprising at least one hydraulic system, at least one hydraulic pipe system, and at least one hydraulic fuse that is capable of being tested in situ for proper functioning, comprising:
- a housing with an inflow and an outflow;
- a closing element mounted in a movable manner in the housing with a front face facing the inflow and a closing surface facing the outflow;
- at least two flow channels extending from the inflow to the outflow;
- at least one orifice, arranged in the flow channels to generate a pressure drop in a fluid flowing from the inflow to the outflow;
- and
- at least one retainer element arranged between the outflow and the closing element;
- wherein an inflow pressure of the fluid at the inflow acts on the front face of the closing element and an outflow pressure of the fluid at the outflow acts on the closing surface of the closing element;
- wherein the retainer element is dimensioned in such a way that, at a predetermined minimum difference between the inflow pressure and the outflow pressure, the closing element moves against a retaining force from the retainer element towards the outflow into a closing position;
- and
- wherein the device further comprises at least one test closure biased in an opening position and configured to close at least one of the flow channels so that the flow speed in the other flow channels is increased, the pressure drop through the orifice increases, and a movement of the closing element is thus induced.
A method for in situ testing a hydraulic fuse in a system through which fluid flows, the hydraulic fuse having at least one test closure, the method comprising:
- initiating operation of the system, the system including a housing with an inflow and an outflow, a closing element mounted in a movable manner in the housing, at least two flow channels extending from the inflow to the outflow and at least one orifice arranged in the flow channels to create a pressure drop in a fluid flowing from the inflow to the outflow;
- closing at least one flow channel in the hydraulic fuse by moving the at least one test closure into a closed position, the at least one test closure biased in an opening position;
- responsive to the closing, the at least one flow channel in the hydraulic fuse is closed so that the flow speed in the other of the flow channels of the hydraulic fuse is increased and the pressure drop through the orifice increases;
- and
- establishing that the hydraulic fuse operates correctly, if the pressure drop causes the closing element to move relative to the housing to shut off the fluid flow through the hydraulic fuse.
Dependencies are inferred from the claim text.