US20040149043A1 - Self-retaining pressure sensor assembly having notched seal retention flange - Google Patents
Self-retaining pressure sensor assembly having notched seal retention flange Download PDFInfo
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- US20040149043A1 US20040149043A1 US10/357,715 US35771503A US2004149043A1 US 20040149043 A1 US20040149043 A1 US 20040149043A1 US 35771503 A US35771503 A US 35771503A US 2004149043 A1 US2004149043 A1 US 2004149043A1
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- pressure sensor
- sensor assembly
- notches
- assembly
- flange
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
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- FIG. 3 is a cross-sectional view of a fully assembled pressure sensor- and seal according to this invention.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
- This invention relates to a pressure sensor assembly including a resilient seal for sealing a pressure vessel opening and retaining the pressure sensor in the opening, and more particularly to a seal that provides reduced and controlled insertion and extraction forces.
- Motor vehicle engine controls sometimes require measurement of gas pressures subject to positive pressure fluctuations that tend to expel or blow out the pressure sensor. For example, the gas pressure in the intake manifold of an internal combustion engine experiences a sudden positive surge during an engine backfire. A similar condition can occur with a fuel tank vapor pressure sensor in the event of a crash. Although the usual solution in such applications is to use screw fasteners or the like to secure the pressure sensor to the wall of the pressure vessel, it has been found that the sensor can be adequately secured with significant reductions in material and assembly expense by fitting the stem of the sensor with a resilient, flexible annular seal having a retention flange that is larger than the pressure vessel opening. Such a seal is disclosed in the U.S. Pat. No. 5,317,924 to Maack, issued on Jun. 7, 1994, assigned to the assignee of the present invention, and incorporated herein by reference.
- Referring to FIG. 1, the
seal 10 disclosed in the aforementioned U.S. Pat. No. 5,317,924 includes a plurality offins 12 of approximately the same diameter as the opening 14 in apressure vessel wall 16, aretention flange 18 having a diameter that is larger than the opening 14, and a centralaxial bore 20. Thepressure sensor 22 has aported stem 24 that terminates in an enlargedcylindrical foot 26, and thestem 24 is inserted through theseal bore 20 until theseal 10 is retained between thefoot 26 and ahousing 28 of thesensor 22. When the assembly is inserted into theopening 14, theretention flange 18 extends through theopening 14 and seats against the interior periphery of thepressure vessel wall 16 about theopening 14. Thefins 12 prevent leakage between theseal 10 and theopening 14, and theflange 18 andfoot 26 retain thesensor 22 in theopening 14 in the presence of a high positive gas pressure in the pressure vessel. When thesensor 22 must be removed for repair or replacement, it may be extracted with a suitable tool capable of exerting an extraction force sufficient to deform and compress theretention flange 18. - In usage, the insertion and extraction forces are held to reasonably low values by appropriate selection of the seal composition and by coating the seal with an oil-based lubricant prior to insertion of the pressure sensor into the pressure vessel opening. For example, the seal may be a fluorosilicone polymer, and the lubricant may be a silicone emulsion. The fluorosilicone material is very resilient and flexible by nature, and the silicone-based lubricant remains on the seal so that the extraction force is not significantly increased over time. In a typical application of the sensor depicted in FIG. 1, the average insertion force may be approximately seven pounds, while the average extraction force may be approximately eighteen pounds.
- While the above-described approach has been successfully used in automotive applications for several years, newly proposed emission regulations severely restrict the use of fluorosilicone materials and silicone emulsion lubricants in engine applications. For example, many manufacturers now specify the use of fluorocarbon instead of fluorosilicone, and only water-based lubricants. Unfortunately, fluorocarbon is less flexible than fluorosilicone, and water-based lubricants tend to evaporate over time. As a result, the force required to extract a sensor equipped with a fluorocarbon seal is unacceptably high. Also, it would be desirable from a cost standpoint to eliminate the seal lubricant entirely. Accordingly, what is needed is a seal design that will permit the use of relatively stiff material such as fluorocarbon and no lubricant, and still provide acceptably low insertion and extraction forces.
- The present invention provides an improved self-retaining pressure sensor assembly including a pressure sensor having a housing and a depending ported stem terminated in an enlarged foot and a flanged resilient seal disposed about the stem between the pressure sensor housing and foot, wherein the seal flange has one or more notches about its circumferential periphery to ease insertion and extraction of the assembly with respect to a circular opening formed in a pressure vessel. The notches reduce the effective area of the flange, proportionately decreasing the force (insertion force) needed to insert the assembly at the time of installation and the force (extraction force) needed to subsequently remove the assembly for repair or replacement. The number and size of the notches can be adjusted to provide acceptable insertion and extraction forces, without lubricant, while not significantly compromising the self-retention capability of the assembly.
- FIG. 1 is an isometric view of a prior art self-retaining pressure sensor and seal.
- FIG. 2 is an isometric view of a pressure sensor seal according to this invention.
- FIG. 3 is a cross-sectional view of a fully assembled pressure sensor- and seal according to this invention.
- Referring to FIG. 3, the
reference numeral 30 generally designates the pressure sensor assembly of the present invention as installed in ancircular opening 32 formed in apressure vessel wall 34. As mentioned above, thepressure vessel wall 34 may be the intake manifold of an internal combustion engine or a motor vehicle fuel tank, for example. In either case, the gaseous medium constrained by thewall 34 is subject to sudden positive pressure surges that tend to expel thesensor assembly 30 from theopening 32. - As with the prior art pressure sensor assembly depicted in FIG. 1, the
pressure sensor assembly 30 depicted in FIG. 3 includes a resilient,flexible seal 36 that serves the dual purpose of sealing the constrained medium from the ambient pressure and retaining theassembly 30 within thepressure vessel wall 34 during positive pressure surges of the constrained medium. In particular, thefins 38 ofseal 36 provide a seal between the constrained medium and the ambient pressure, and theretention flange 40 ofseal 36 seats on the interior surface of thewall 34 about theopening 32 to prevent theassembly 30 from being expelled in the event of a positive pressure surge of the constrained medium. Also as in FIG. 1, theseal 36 is retained on a portedpressure sensor stem 42 between thepressure sensor housing 44 and afoot 46 formed on the end ofstem 42. However, in theseal 36 of FIG. 3, the diameter of thefins 38 is enlarged relative to that of thefins 12 of FIG. 1, and more importantly, theretention flange 40 is provided with a plurality ofnotches 48 in its circumferential periphery. - As best seen in the isometric view of FIG. 2, the
seal 36 includes acentral opening 50 for accommodating thepressure sensor stem 42, anupper flange 52 that extends in part between thepressure sensor housing 44 and the exterior periphery of thepressure vessel wall 34, theaforementioned fins 38, and theaforementioned retention flange 40. In the illustrated embodiment, theretention flange 40 has fournotches 48 evenly spaced about its periphery, each subtending an angle of approximately 40 degrees. However, it will be understood that some applications may require more or fewer notches, and that thenotches 48 may be wider or narrower than in the illustrated embodiment. But in any event, thenotches 48 serve to reduce the effective area of theretention flange 40, allowing theassembly 30 to be inserted into theopening 32 with reduced force, and subsequently extracted with reduced force, for a seal of a given composition, as compared with theprior art seal 10 in which theflange 18 is not notched. During such insertion and extraction, thenotches 48 partially collapse as the material offlange 40 is compressed, whereafter the flange material returns to its former state. Thenotches 48 are preferably arcuate in shape as shown, and symmetrically disposed about the periphery of theflange 40. In the illustrated embodiment, thenotches 48 are sized to reduce the effective area of theretention flange 40 by approximately 45%, providing a similar percentage of reduction in the required insertion and extraction forces, compared with an assembly having a seal of the same material with an un-notched retention flange. - Due to the reduced insertion and extraction forces afforded by the notching of
retention flange 40, theassembly 30 may be installed without a lubricant, and the extraction force will not increase over time, as in the case of a lubricant subject to loss by evaporation. Also, the characteristic stiffness of the seal material is no longer critical, allowing the use of non-silicone containing polymers such as fluorocarbon. - In summary, the pressure sensor assembly of the present invention contributes to reduced cost compared to the prior art sensor of FIG. 1 by eliminating the need for a lubricant to ease insertion and extraction, and by permitting a wider range of seal material selection. While the invention has been described in reference to the illustrated embodiment, it is expected that various modifications in addition to those mentioned above will occur to those skilled in the art. For example, the
notches 48 may vary in number and/or shape as mentioned above, and the seal material may be different than specified for the illustrated embodiment. Accordingly, it will be understood that sensor assemblies incorporating these and other modifications may fall within the scope of this invention, which is defined by the appended claims.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/357,715 US6779406B1 (en) | 2003-02-04 | 2003-02-04 | Self-retaining pressure sensor assembly having notched seal retention flange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/357,715 US6779406B1 (en) | 2003-02-04 | 2003-02-04 | Self-retaining pressure sensor assembly having notched seal retention flange |
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US20040149043A1 true US20040149043A1 (en) | 2004-08-05 |
US6779406B1 US6779406B1 (en) | 2004-08-24 |
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US10/357,715 Expired - Lifetime US6779406B1 (en) | 2003-02-04 | 2003-02-04 | Self-retaining pressure sensor assembly having notched seal retention flange |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110621529A (en) * | 2017-04-10 | 2019-12-27 | 伊顿智能动力有限公司 | Vapor pressure sensor assembly |
US20220146356A1 (en) * | 2020-11-12 | 2022-05-12 | Magna Energy Storage Systems Gesmbh | Holder for a pressure sensor |
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WO2007002185A2 (en) | 2005-06-21 | 2007-01-04 | Cardiomems, Inc. | Method of manufacturing implantable wireless sensor for in vivo pressure measurement |
DE102006005502B4 (en) * | 2006-02-07 | 2024-05-08 | Robert Bosch Gmbh | Pressure sensor mounting with molded seal |
US7636053B2 (en) * | 2006-09-20 | 2009-12-22 | Toyota Motor Engineering & Manufacturing North America, Inc. | Article and method for monitoring temperature and pressure within a pressurized gas cylinder |
US8894582B2 (en) | 2007-01-26 | 2014-11-25 | Endotronix, Inc. | Cardiac pressure monitoring device |
US10003862B2 (en) | 2007-03-15 | 2018-06-19 | Endotronix, Inc. | Wireless sensor reader |
US8570186B2 (en) | 2011-04-25 | 2013-10-29 | Endotronix, Inc. | Wireless sensor reader |
US8493187B2 (en) * | 2007-03-15 | 2013-07-23 | Endotronix, Inc. | Wireless sensor reader |
US8154389B2 (en) | 2007-03-15 | 2012-04-10 | Endotronix, Inc. | Wireless sensor reader |
WO2008115456A1 (en) * | 2007-03-15 | 2008-09-25 | Nunez Anthony I | Transseptal monitoring device |
US7819016B2 (en) * | 2009-03-03 | 2010-10-26 | Kuo-Liang Chen | Non-disposable and reusable air pressure gauge |
BE1020453A3 (en) * | 2011-12-01 | 2013-10-01 | Unilin Bvba | FURNITURE AND METHOD FOR MANUFACTURING FURNITURE. |
EP3632303B1 (en) | 2012-09-14 | 2022-02-02 | Endotronix, Inc. | Pressure sensor, anchor, delivery system and method |
DE102015104410B4 (en) * | 2015-03-24 | 2018-09-13 | Tdk-Micronas Gmbh | pressure sensor |
US9996712B2 (en) | 2015-09-02 | 2018-06-12 | Endotronix, Inc. | Self test device and method for wireless sensor reader |
US11615257B2 (en) | 2017-02-24 | 2023-03-28 | Endotronix, Inc. | Method for communicating with implant devices |
AU2018224198B2 (en) | 2017-02-24 | 2023-06-29 | Endotronix, Inc. | Wireless sensor reader assembly |
AU2018254569B2 (en) | 2017-04-20 | 2022-05-12 | Endotronix, Inc. | Anchoring system for a catheter delivered device |
AU2018304316A1 (en) | 2017-07-19 | 2020-01-30 | Endotronix, Inc. | Physiological monitoring system |
WO2019046837A1 (en) | 2017-09-02 | 2019-03-07 | Precision Drone Services Intellectual Property, Llc | Seed distribution assembly for an aerial vehicle |
Citations (8)
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US4756193A (en) * | 1987-09-11 | 1988-07-12 | Delco Electronics Corporation | Pressure sensor |
US4850227A (en) * | 1987-12-22 | 1989-07-25 | Delco Electronics Corporation | Pressure sensor and method of fabrication thereof |
US5209122A (en) * | 1991-11-20 | 1993-05-11 | Delco Electronics Corporation | Pressurer sensor and method for assembly of same |
US5317924A (en) * | 1992-07-13 | 1994-06-07 | Delco Electronics Corporation | Self-retaining, self-sealing pressure sensor |
US5377403A (en) * | 1992-04-06 | 1995-01-03 | Delco Electronics Corp. | Method of manufacturing a pressure sensor assembly |
US5942691A (en) * | 1998-07-22 | 1999-08-24 | Delco Electronics Corp. | Differential pressure transducer assembly |
US6050147A (en) * | 1997-12-05 | 2000-04-18 | Delco Electronics Corp. | Pressure sensor assembly |
US6227055B1 (en) * | 1999-11-01 | 2001-05-08 | Delphi Technologies, Inc. | Pressure sensor assembly with direct backside sensing |
-
2003
- 2003-02-04 US US10/357,715 patent/US6779406B1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4756193A (en) * | 1987-09-11 | 1988-07-12 | Delco Electronics Corporation | Pressure sensor |
US4850227A (en) * | 1987-12-22 | 1989-07-25 | Delco Electronics Corporation | Pressure sensor and method of fabrication thereof |
US5209122A (en) * | 1991-11-20 | 1993-05-11 | Delco Electronics Corporation | Pressurer sensor and method for assembly of same |
US5377403A (en) * | 1992-04-06 | 1995-01-03 | Delco Electronics Corp. | Method of manufacturing a pressure sensor assembly |
US5317924A (en) * | 1992-07-13 | 1994-06-07 | Delco Electronics Corporation | Self-retaining, self-sealing pressure sensor |
US6050147A (en) * | 1997-12-05 | 2000-04-18 | Delco Electronics Corp. | Pressure sensor assembly |
US5942691A (en) * | 1998-07-22 | 1999-08-24 | Delco Electronics Corp. | Differential pressure transducer assembly |
US6227055B1 (en) * | 1999-11-01 | 2001-05-08 | Delphi Technologies, Inc. | Pressure sensor assembly with direct backside sensing |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110621529A (en) * | 2017-04-10 | 2019-12-27 | 伊顿智能动力有限公司 | Vapor pressure sensor assembly |
US20220146356A1 (en) * | 2020-11-12 | 2022-05-12 | Magna Energy Storage Systems Gesmbh | Holder for a pressure sensor |
US11656142B2 (en) * | 2020-11-12 | 2023-05-23 | Magna Energy Storage Systems Gesmbh | Holder for a pressure sensor |
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US6779406B1 (en) | 2004-08-24 |
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