|Publication number||USH1045 H|
|Application number||US 07/615,182|
|Publication date||May 5, 1992|
|Filing date||Nov 19, 1990|
|Priority date||Nov 19, 1990|
|Publication number||07615182, 615182, US H1045 H, US H1045H, US-H-H1045, USH1045 H, USH1045H|
|Inventors||Arthur D. Wilson|
|Original Assignee||The United States Of America As Represented By The Secretary Of The Army|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (75), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The invention described herein may be manufactured, used, or licensed by or for the government for governmental purposes without the payment to me of any royalties thereon.
This invention relates to devices for detecting leaks in seals. More particularly, this invention relates to devices for providing a visual and electronic indication of leakage in a fuze seal.
One of the performance characteristics which must be determined for a fuze seal is the degree of leakage when placed under pressure. The generally accepted method of determining such leakage has been to pressurize the unit under test, submerge it in a liquid, and visually look for bubbles. First, consistently accurate results are not readily obtainable by visual observation. Second, by its very nature, this test cannot be conducted under "dry" conditions. Finally, a significant amount of time is required for set-up and testing.
These difficulties and others not enumerated here are addressed by the invention, one embodiment of which may include a test fixture for mounting the unit to be tested and applying air pressure to it, an air bubble leak indicator, and an air supply. The air bubble leak indicator includes a chamber partially filled with a liquid. The chamber has an input orifice, situated below the liquid level, which is connected to the air supply. It further has an output orifice, situated above the liquid level, which is connected to the test fixture. If the unit under test leaks, the same quantity of air escaping from the seal will leave the air supply and pass through the air bubble leak indicator chamber. It enters the chamber from the input orifice, passes through the liquid, and leaves the chamber via the output orifice. The input orifice has a narrow diameter, forcing the air bubbles to enter the chamber in a narrow stream. A light intensity detector is placed at the opening of the input orifice and can determine whenever an air bubble passes. Further, the chamber of the air bubble leak indicator is transparent, providing a visual check of the operation of the device.
In a second embodiment, the air bubble leak detection test device is provided with a leak rate indicator. The leak rate indicator includes a manometer placed in series between the air bubble leak detection test device and the test fixture.
It is an object of the invention to provide an air bubble leak detection test device which can perform leakage tests rapidly.
A further object of the invention to provide an air bubble leak detection test device which can perform leakage tests accurately.
Yet another object of the invention to provide an air bubble leak detection test device which can perform leakage tests economically.
It is a further object of the present invention to perform leakage tests under "dry" conditions.
It is a still further object of the invention to provide an air bubble leak detection test device which can provide both a visual and an electronic indication of leakage.
It is a further object of the invention to provide an air bubble leak detection test device which can provide an indication of leakage rate.
A more complete understanding of the present invention, as well as other objects and advantages thereof not enumerated, will become apparent upon consideration of the following detailed description, especially when considered in light of the accompanying drawings, wherein:
FIG. 1 is a schematic system diagram of the air bubble leak detection test device; and
FIG. 2 is a partial cross-sectional view of the air bubble leak indicator.
The structure and operation of the air bubble leak detection test device may be best explained by reference to FIG. 1. The air bubble leak detection test device or "system38 is indicated generally by reference numeral 10. The system receives pressurized air from an air supply 12. The output of the air supply 12 is unregulated and thus the system is provided with a regulator 14. The output 16 of the regulator 14 is connected to an isolation valve 18. The purpose of the isolation valve 18 is to shield the system 10 from the fluctuations in pressure of the air from the air supply 12.
The output of the isolation valve 18 is connected to an air accumulator 20. The output 22 of the accumulator 20 is connected to a pressurization valve 24. The output of the pressurization valve 24 is connected to the test fixture 26. The unit to be tested 27 is placed in the test fixture 26 and clamped by seal 28. The output 22 of the accumulator 20 is also connected to an air bubble leak indicator 30 through its input 32. The output 34 of the air bubble leak indicator 30 is connected to a bypass valve 36. The output 34 of the air bubble leak indicator 30 is also connected to a manometer 38 through its input 41. The output of the bypass valve 36 and the output of the manometer 38 are connected to the test fixture 26. Both the air bubble leak indicator 30 and the manometer 38 are partially filled with liquid 40.
The air bubble leak indicator 30 is illustrated in greater detail in FIG. 2. The air bubble leak indicator 30 has a narrow internal chamber 42 partially filled with liquid 40. The input 32 of the air bubble leak indicator 30 is connected to a narrow orifice 44 located inside the internal chamber 42. The outlet 46 of the orifice 44 will emit a stream of bubbles if air leaks from the unit under test 27.
The following structure provides the means for detecting a stream of air bubbles. A light source 48 emits light which is directed into a fiber optic conduit 50. The output 52 of the fiber optic conduit 50 is positioned at the outlet 46 of the narrow orifice 44. A second fiber optic conduit 54 is positioned colinearly with respect to the first fiber optic conduit 50 just beyond the outlet 46 of the narrow orifice 44. The outlet 56 of the second fiber optic conduit 54 is positioned adjacent to a light detector 58.
Air bubbles passing through the liquid 40 in the air bubble leak indicator 30 enter an upper chamber 60. The air flow then leaves the upper chamber 60 through the output 34 of the air bubble leak indicator 30.
To operate the system, all valves, the isolation valve 18, the pressurization valve 24, and the bypass valve 36, are opened. This will permit the system lines to pressurize. After a short interval, the isolation valve 18 is closed. Typically, the pressurization valve 24 will be linked to the isolation valve 18, so that both valves are closed. The air bubble leak indicator 30, which is constructed from a transparent material 64, will register any indication of leakage from the unit under test 27. If there is leakage, air bubbles will flow upward through the liquid 40 in the chamber 42 of the air bubble leak indicator 30. This can be determined visually. The passage of bubbles past the fiber optic conduits 50 and 54 will diffract the light passing between them. If an oscilloscope or similar device is connected to the output 62 of the light detector 58, this diffraction, or rather the passage of air bubbles, will be detected.
An indication of rate of leakage can be had by closing bypass valve 36. This will shunt the output of air flow from the air bubble leak indicator 30 to the input 41 of the manometer 38. If one does not desire to measure leakage rate, the manometer 38 and the bypass valve 36 can be elimianted. The output 34 of the air bubble leak indicator 30 would then be connected directly to the line connecting the pressurization valve 24 and the test fixture 26.
While there has been described what is the believed to be the preferred embodiment of the invention, those skilled in the art will recognize that other and further modifications may be made thereto without departing from the spirit of the invention, and it is intended to claim all such embodiments that fall within the true scope of the invention.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5918264 *||Oct 27, 1993||Jun 29, 1999||Usf Filtration And Separations Group Inc.||Fiber monitoring system|
|US6003363 *||Sep 18, 1998||Dec 21, 1999||Fastest, Inc.||Leak detection apparatus and method|
|US6783008||Oct 9, 2002||Aug 31, 2004||U.S. Filter Wastewater Group, Inc.||Hollow fibre restraining system|
|US6821420||May 1, 2003||Nov 23, 2004||U. S. Filter Wastewater Group, Inc.||Apparatus and method for cleaning membrane filtration modules|
|US6872305||Apr 2, 2003||Mar 29, 2005||U.S. Filter Wastewater Group, Inc.||Membrane filtration system|
|US6884350||May 12, 2003||Apr 26, 2005||U.S. Filter Wastewater Group, Inc.||Modified membranes|
|US6955762||Nov 15, 2002||Oct 18, 2005||U. S. Filter Wastewater Group, Inc.||Method of cleaning membranes|
|US6974554||Sep 30, 2003||Dec 13, 2005||U.S. Filter Wastewater Group, Inc.||Potting method|
|US7018533||Mar 16, 2004||Mar 28, 2006||U.S. Filter Wastewater Group, Inc.||High solids module|
|US7226541||Dec 16, 2003||Jun 5, 2007||Siemens Water Technology Corp.||Membrane polymer compositions|
|US7247238||Aug 9, 2004||Jul 24, 2007||Siemens Water Technologies Corp.||Poly(ethylene chlorotrifluoroethylene) membranes|
|US7264716||Nov 20, 2003||Sep 4, 2007||Siemens Water Technologies Corp.||Membrane filtration manifold system|
|US7300022||Jul 30, 2004||Nov 27, 2007||Siemens Water Technologies Corp.||Modified membranes|
|US7404896||Jul 29, 2004||Jul 29, 2008||Siemens Water Technologies Corp.||Modified membranes|
|US7718057||Sep 18, 2008||May 18, 2010||Siemens Water Technologies Corp.||Wastewater treatment system|
|US7718065||May 30, 2008||May 18, 2010||Siemens Water Technologies Corp.||Filtration method and apparatus|
|US7722769||May 9, 2008||May 25, 2010||Siemens Water Technologies Corp.||Method for treating wastewater|
|US7819956||Jun 30, 2005||Oct 26, 2010||Siemens Water Technologies Corp.||Gas transfer membrane|
|US7862719||Aug 19, 2005||Jan 4, 2011||Siemens Water Technologies Corp.||Square membrane manifold system|
|US7867417||Dec 2, 2005||Jan 11, 2011||Siemens Water Technologies Corp.||Membrane post treatment|
|US7931463||Aug 5, 2005||Apr 26, 2011||Siemens Water Technologies Corp.||Apparatus for potting membranes|
|US7938966||Oct 10, 2003||May 10, 2011||Siemens Water Technologies Corp.||Backwash method|
|US7988891||Jul 14, 2006||Aug 2, 2011||Siemens Industry, Inc.||Monopersulfate treatment of membranes|
|US8048306||Dec 22, 2005||Nov 1, 2011||Siemens Industry, Inc.||Scouring method|
|US8182687||Jan 30, 2008||May 22, 2012||Siemens Industry, Inc.||Methods of minimising the effect of integrity loss in hollow fibre membrane modules|
|US8262778||Aug 10, 2011||Sep 11, 2012||Siemens Industry, Inc.||Membrane post treatment|
|US8268176||Aug 27, 2004||Sep 18, 2012||Siemens Industry, Inc.||Backwash|
|US8293098||Oct 23, 2007||Oct 23, 2012||Siemens Industry, Inc.||Infiltration/inflow control for membrane bioreactor|
|US8372276||Nov 17, 2011||Feb 12, 2013||Siemens Industry, Inc.||Membrane cleaning with pulsed airlift pump|
|US8372282||Dec 5, 2003||Feb 12, 2013||Siemens Industry, Inc.||Mixing chamber|
|US8377305||Sep 15, 2005||Feb 19, 2013||Siemens Industry, Inc.||Continuously variable aeration|
|US8382981||Jul 29, 2009||Feb 26, 2013||Siemens Industry, Inc.||Frame system for membrane filtration modules|
|US8496828||Dec 19, 2005||Jul 30, 2013||Siemens Industry, Inc.||Cleaning in membrane filtration systems|
|US8506806||Sep 13, 2005||Aug 13, 2013||Siemens Industry, Inc.||Methods and apparatus for removing solids from a membrane module|
|US8518256||Apr 15, 2011||Aug 27, 2013||Siemens Industry, Inc.||Membrane module|
|US8524794||Jul 4, 2005||Sep 3, 2013||Siemens Industry, Inc.||Hydrophilic membranes|
|US8622222||May 29, 2008||Jan 7, 2014||Siemens Water Technologies Llc||Membrane cleaning with pulsed airlift pump|
|US8623202||Oct 17, 2012||Jan 7, 2014||Siemens Water Technologies Llc||Infiltration/inflow control for membrane bioreactor|
|US8652331||Aug 17, 2009||Feb 18, 2014||Siemens Water Technologies Llc||Membrane system backwash energy efficiency|
|US8758621||Mar 24, 2005||Jun 24, 2014||Evoqua Water Technologies Llc||Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis|
|US8758622||Dec 22, 2005||Jun 24, 2014||Evoqua Water Technologies Llc||Simple gas scouring method and apparatus|
|US8808540||Nov 12, 2004||Aug 19, 2014||Evoqua Water Technologies Llc||Module cleaning method|
|US8840783||Feb 12, 2013||Sep 23, 2014||Evoqua Water Technologies Llc||Water treatment membrane cleaning with pulsed airlift pump|
|US8858796||Aug 22, 2006||Oct 14, 2014||Evoqua Water Technologies Llc||Assembly for water filtration using a tube manifold to minimise backwash|
|US8894858||Jul 15, 2014||Nov 25, 2014||Evoqua Water Technologies Llc||Method and assembly for water filtration using a tube manifold to minimize backwash|
|US8956464||Jun 11, 2010||Feb 17, 2015||Evoqua Water Technologies Llc||Method of cleaning membranes|
|US9022224||Sep 22, 2011||May 5, 2015||Evoqua Water Technologies Llc||Fluid control manifold for membrane filtration system|
|US9023206||Jan 9, 2013||May 5, 2015||Evoqua Water Technologies Llc||Frame system for membrane filtration modules|
|US9206057||Feb 11, 2014||Dec 8, 2015||Evoqua Water Technologies Llc||Membrane cleaning with pulsed airlift pump|
|US9533261||Jun 26, 2013||Jan 3, 2017||Evoqua Water Technologies Llc||Potting method|
|US9573824||Nov 26, 2013||Feb 21, 2017||Evoqua Water Technologies Llc||Membrane cleaning with pulsed airlift pump|
|US9604166||Sep 17, 2012||Mar 28, 2017||Evoqua Water Technologies Llc||Manifold arrangement|
|US9630147||Nov 10, 2014||Apr 25, 2017||Evoqua Water Technologies Llc||Fluid control manifold for membrane filtration system|
|US20030178365 *||Feb 18, 2003||Sep 25, 2003||Fufang Zha||Scouring method|
|US20030205519 *||May 1, 2003||Nov 6, 2003||Fufang Zha||Apparatus and method for cleaning membrane filtration modules|
|US20030234221 *||Apr 2, 2003||Dec 25, 2003||U.S. Filter Wastewater Group, Inc.||Membrane filtration system|
|US20040000520 *||Nov 15, 2002||Jan 1, 2004||Gallagher Paul Martin||Method of cleaning membranes|
|US20040035782 *||May 12, 2003||Feb 26, 2004||Heinz-Joachim Muller||Modified membranes|
|US20040084369 *||Sep 30, 2003||May 6, 2004||U.S. Filter Wastewater Group, Inc.||Scouring method|
|US20040178154 *||Mar 19, 2004||Sep 16, 2004||Pall Filtration And Separations Group Inc.||Scouring method|
|US20040191894 *||Dec 16, 2003||Sep 30, 2004||Heinz-Joachim Muller||Membrane polymer compositions|
|US20040232076 *||Jun 14, 2004||Nov 25, 2004||Fufang Zha||Scouring method|
|US20040238442 *||Mar 16, 2004||Dec 2, 2004||Johnson Warren Thomas||High solids module|
|US20040262215 *||Jul 19, 2004||Dec 30, 2004||Fufang Zha||Hollow fibre restraining system|
|US20050029185 *||Jul 30, 2004||Feb 10, 2005||Heinz-Joachim Muller||Modified membranes|
|US20050029186 *||Jul 29, 2004||Feb 10, 2005||Heinz-Joachim Muller||Modified membranes|
|US20050087898 *||Sep 30, 2003||Apr 28, 2005||U. S. Filter Wastewater Group, Inc.||Potting method|
|US20050098494 *||Aug 9, 2004||May 12, 2005||Daniel Mullette||Halar membranes|
|US20050218073 *||Mar 4, 2005||Oct 6, 2005||Gallagher Paul M||Method of cleaning membranes|
|US20070084795 *||Oct 4, 2006||Apr 19, 2007||Jordan Edward J||Method and system for treating wastewater|
|US20070138090 *||Oct 4, 2006||Jun 21, 2007||Jordan Edward J||Method and apparatus for treating wastewater|
|US20070209993 *||Jul 31, 2006||Sep 13, 2007||Fufang Zha||Hollow fibre restraining system|
|US20080214687 *||Jun 20, 2006||Sep 4, 2008||Heinz-Joachim Muller||Cross Linking Treatment of Polymer Membranes|
|US20090230053 *||Dec 2, 2005||Sep 17, 2009||Siemens Water Technologies Corp.||Membrane post treatment|
|US20170059444 *||Aug 31, 2015||Mar 2, 2017||AUTOMATIC TOOL CONTROL AND MANAGEMENT SYSTEMS, INC., d/b/a ATC, Inc.||Large volume test apparatuses and methods for detection of small defects|
|U.S. Classification||73/40, 73/49.3, 73/52|