US20070125231A1 - Pressure equalisation device - Google Patents

Pressure equalisation device Download PDF

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Publication number
US20070125231A1
US20070125231A1 US10/556,167 US55616704A US2007125231A1 US 20070125231 A1 US20070125231 A1 US 20070125231A1 US 55616704 A US55616704 A US 55616704A US 2007125231 A1 US2007125231 A1 US 2007125231A1
Authority
US
United States
Prior art keywords
enclosure
air passage
air
carrier
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/556,167
Other languages
English (en)
Inventor
Alan Thomas
Colin Gradwell
Mark Hemmings
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knorr Bremse Rail Systems UK Ltd
Original Assignee
Knorr Bremse Rail Systems UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Knorr Bremse Rail Systems UK Ltd filed Critical Knorr Bremse Rail Systems UK Ltd
Assigned to KNORR-BREMSE RAIL SYSTEMS (UK) LTD. reassignment KNORR-BREMSE RAIL SYSTEMS (UK) LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GRADWELL, COLIN, HEMMINGS, MARK, THOMAS, ALAN
Publication of US20070125231A1 publication Critical patent/US20070125231A1/en
Priority to US12/905,188 priority Critical patent/US8105408B2/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0627—Protection against aggressive medium in general
    • G01L19/0636—Protection against aggressive medium in general using particle filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/40—Particle separators, e.g. dust precipitators, using edge filters, i.e. using contiguous impervious surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/002—Air treatment devices
    • B60T17/008—Silencer devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members
    • F16K15/144—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery
    • 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
    • G01L19/14—Housings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0213—Venting apertures; Constructional details thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0213—Venting apertures; Constructional details thereof
    • H05K5/0215—Venting apertures; Constructional details thereof with semi-permeable membranes attached to casings

Definitions

  • the present invention relates to a pressure equalisation device adapted to be operatively connected to an enclosure to ensure that, during operation, the pressure in the enclosure is substantially equal to atmospheric pressure at all times.
  • the enclosure and the air vents are subjected to a harsh environment which includes dust and water and it is necessary to exclude such foreign matter from entering the enclosure through the pressure equalisation device, to prevent damage to the equipment inside the enclosure.
  • IP 66 is an industry standard for instrument protection, the first digit indicating a level of protection against solid objects, 6 being no ingress of dust possible, the second digit indicating a level of protection against liquids, 6 being protection against powerful jets of water.
  • a pressure equalisation device adapted to be operatively connected to an enclosure, the device including an air passage which, when the device is so connected to the enclosure, provides a fluid communication between the interior of the enclosure and atmosphere, the air passage containing a barrier wall comprising an air permeable membrane forming a particulate filter.
  • the barrier wall extends across the air passage and a predetermined distance along the passage so as to have an area subjected to the air flow which is greater than the cross-sectional area of the passage.
  • the device comprises a carrier for the barrier wall, the carrier being sealingly insertable in a bore in a wall of the enclosure, the air passage being formed in part by said bore.
  • the permeable membrane preferably forms a micro particulate filter, which may be formed of a polymer material.
  • the barrier wall also forms a water barrier preventing the increase of water into the enclosure.
  • the device may also include a baffle means to inhibit water entering the air passage.
  • the baffle may serve to clamp the carrier to the enclosure.
  • the device preferably includes a second air passage in parallel with the first air passage for venting the enclosure, the second air passage including a one-way vent valve adapted to permit air flow out of the enclosure through said second air passage but to prevent air flowing into the enclosure through said second air passage.
  • the second air passage is formed in said carrier, the one-way vent valve comprising a resilient diaphragm biased to close said second air passage and being urged to a closed position by air flowing in a direction towards the enclosure and being opened against the resilient bias by air flowing out of the enclosure.
  • FIG. 1 shows across-section through a pressure equalisation device
  • FIG. 2 shows a schematic form of a vent arrangement and a sealed enclosure.
  • the pressure equalisation device comprises an air permeable device 2 which permits air to flow to and from the interior of the enclosure and a one-way vent valve 3 which permits air to flow out of the interior of the enclosure 1 but prevents air from flowing into the enclosure 1 .
  • FIG. 1 there is shown in schematic form a cross-sectional view of a pressure equalisation device 2 incorporated in a wall 4 of a sealed enclosure 1 .
  • the sealed enclosure 1 comprises the housing 4 of an air pressure operated brake control valve for a railway braking system, which contains gauge pressure sensitive components, but which will not be described in any more detail.
  • the housing wall 4 has a stepped bore 5 providing an air passage 6 having an inlet 7 exposed to atmospheric pressure and an outlet 8 leading into the interior of the enclosure.
  • the larger diameter portion 5 a of the bore 5 contains an annular carrier 9 having a central opening 10 which defines the first air passage 6 , and a plurality of axially extending bores 11 arranged about the carrier 9 on a diameter smaller than the smaller diameter 5 b of the stepped bore 5 in the housing and which form a second air passage.
  • the first air passage is closed by an air permeable membrane 12 which extends along the axial direction of the air passage 6 towards the interior of the enclosure 1 so that the surface area of the membrane which is subjected to the passage of air is substantially greater than the cross-sectional area of the opening 10 in the carrier 9 .
  • the membrane 12 is formed of a microporous polymer which is air permeable but provides a micro-particulate filter to prevent any dust entering the enclosure through the air passage 6 .
  • a suitable material is sold by W L Gore Inc. under the Trademark GORE-TEX.
  • the membrane is preformed in a semi-rigid condition so that it overlies the carrier 9 and maintains its shape in the installed condition in which it is clip-fastened into the opening 10 in the carrier 9 for ease of assembly.
  • the carrier 9 is sealed in the stepped bore 5 a by an annular ring seal 13 located between the carrier 9 and the shoulder 14 of the stepped bore 5 whilst a further annular ring seal 15 is located between the wall of the opening on the carrier 9 and the membrane 12 to prevent the ingress of air past the membrane 12 .
  • a resilient annular silicon rubber diaphragm 16 is located on the outside of the carrier 9 and is clamped in position through a spacer 18 by a baffle plate 17 secured to the outer surface of the wall of the enclosure by screws 19 .
  • the diaphragm 16 forms a one-way check valve for the second air passage formed by the bores 11 .
  • the diaphragm 16 In its normal position the diaphragm 16 lies against the face of the carrier 9 to close the second air passage, as shown.
  • the resilient diaphragm deflects to open the second air passage.
  • the diaphragm In the absence of a substantial air flow, the diaphragm lies in its closed position to close the second air passage but if air flows in the inward direction towards the interior of the housing, the higher external pressure urges the diaphragm 16 against the surface of the carrier 9 to securely and air tightly close the bores 11 .
  • the second air passage remains closed but if there is, for example, a failure in the braking system which results in the generation of high pressure in the interior of the enclosure, this high pressure is vented through the second air passage, which minimises the risk of damage being caused to the barrier wall 12 .
  • the baffle plate 17 has an outwardly extending frusto-conical section 20 axially aligned with the opening 6 in the carrier and having a central bore 21 through which air can flow into the pressure equalisation device. Outside this the baffle plate is shielded by a further, channel-shaped baffle 22 which is also secured to the enclosure housing 4 .
  • the pressure in the interior of the enclosure is maintained at atmospheric pressure by air passing in the appropriate direction through the barrier wall 12 .
  • the micro-particulate filter characteristic of the membrane prevents the ingress of any dust into the enclosure.
  • the enclosure 1 In the working condition, when installed on a railway vehicle, the enclosure 1 is subjected to water impact, which can impinge on the housing with a great force as a jet of water if the vehicle passes through standing water, for example, at high-speed.
  • a first line of defence is provided by the channel shaped baffle plate 22 which prevents water impinging directly on the membrane 12 .
  • Water can pass along the channel flowing laterally of the axis of the first air passage 6 so that to enter the air passage it must change direction by 90 degrees and flow up through the opening in the inner baffle plate 17 before impinging on the membrane 12 .
  • the vast majority of the force of the water is deflected or broken before the water contacts the membrane which reduces the risk of damage to the membrane and also the risk of water being forced through by rupturing the membrane 12 .
  • Water is prevented from passing through into the interior of the housing through the membrane 12 since the pores in the membrane are smaller than molecules of water.
  • the second air passage formed by the plurality of bores 11 in the carrier is normally closed by the annular diaphragm 16 but if the pressure in the interior of the enclosure rises rapidly due, for example, to a failure in the pneumatic braking circuits, the air can flow out through the second air passage, urging diaphragm 16 to the open position, to therefore prevent the excessive air pressure damaging the membrane 12 .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Transportation (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Fluid-Pressure Circuits (AREA)
US10/556,167 2003-05-09 2004-05-10 Pressure equalisation device Abandoned US20070125231A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/905,188 US8105408B2 (en) 2003-05-09 2010-10-15 Pressure equalisation device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0310701.8 2003-05-09
GB0310701A GB2401330B (en) 2003-05-09 2003-05-09 Pressure equalisation device
PCT/GB2004/002015 WO2004099749A1 (en) 2003-05-09 2004-05-10 Pressure equalisation device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/002015 A-371-Of-International WO2004099749A1 (en) 2003-05-09 2004-05-10 Pressure equalisation device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/905,188 Continuation US8105408B2 (en) 2003-05-09 2010-10-15 Pressure equalisation device

Publications (1)

Publication Number Publication Date
US20070125231A1 true US20070125231A1 (en) 2007-06-07

Family

ID=9957764

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/556,167 Abandoned US20070125231A1 (en) 2003-05-09 2004-05-10 Pressure equalisation device
US12/905,188 Expired - Lifetime US8105408B2 (en) 2003-05-09 2010-10-15 Pressure equalisation device

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/905,188 Expired - Lifetime US8105408B2 (en) 2003-05-09 2010-10-15 Pressure equalisation device

Country Status (10)

Country Link
US (2) US20070125231A1 (de)
EP (1) EP1625373B1 (de)
JP (1) JP4917427B2 (de)
KR (1) KR101121765B1 (de)
CN (2) CN1806163A (de)
AT (1) ATE485500T1 (de)
DE (1) DE602004029668D1 (de)
ES (1) ES2354879T3 (de)
GB (1) GB2401330B (de)
WO (1) WO2004099749A1 (de)

Cited By (8)

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US20100218675A1 (en) * 2005-12-27 2010-09-02 Andre Buijs Gas separation apparatus
US20110252971A1 (en) * 2008-11-06 2011-10-20 Masashi Ono Vent Filter
US9108133B1 (en) * 2014-07-24 2015-08-18 Fujikura Rubber Ltd. Air-permeable water non-permeable device
US20170251559A1 (en) * 2014-07-10 2017-08-31 Peerless Industries, Inc. Enclosed media device with improved heat transfer capabilities
CN107806954A (zh) * 2017-10-24 2018-03-16 江苏省无线电科学研究所有限公司 一种气压传感器辅助测量装置
DE102020101213A1 (de) 2020-01-20 2021-07-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Gehäuse mit einer Druckausgleichseinrichtung
US20230125466A1 (en) * 2020-03-30 2023-04-27 Zf Cv Systems Europe Bv Pneumatic device with sealing means and method therefor
US12560253B2 (en) 2022-01-11 2026-02-24 Donaldson Company, Inc. Vent assembly

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DE102016117329A1 (de) * 2016-09-15 2018-03-15 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Gehäuse für ein Steuergerät
CN107168396A (zh) * 2017-06-20 2017-09-15 成都旭思特科技有限公司 应用于高海拔环境的射频装置
CN109383922B (zh) * 2017-08-14 2022-01-11 罗伯特·博世有限公司 盖组件和包括盖盖组件的储液器
CN108692087B (zh) * 2018-06-15 2023-10-31 哈尔滨新中新电子股份有限公司 一种分腔防水的水控一体机
ES2875858T3 (es) * 2018-09-11 2021-11-11 Knorr Bremse Systeme Válvula de compensación de presión
DE102019112241A1 (de) * 2019-05-10 2020-11-12 Valmet Automotive Solutions GmbH Druckausgleichselement
DE102019213303A1 (de) * 2019-09-03 2021-03-04 Robert Bosch Gmbh Maschine, insbesondere Elektromotor oder Elektrogenerator, mit einem dichten Gehäuse und Lüftungsorgan
CN110967141A (zh) * 2019-11-22 2020-04-07 南京南瑞水利水电科技有限公司 一种微压传感器用防水防潮气压平衡装置
CN110736583B (zh) * 2019-11-22 2025-04-08 武汉飞恩微电子有限公司 一种表压力传感器用气流变向的防护结构
TWI742603B (zh) * 2020-04-09 2021-10-11 伊諾司生技股份有限公司 一種具有空腔的感測器
US11850612B2 (en) 2020-09-15 2023-12-26 Aereos Interior Solutions, LLC Rigid bottle with pressure equalization for use in a liquid dispensing system
ES2977814T3 (es) * 2021-01-19 2024-08-30 Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh Dispositivo secador de aire y dispositivo de tratamiento de aire
EP4180291B1 (de) 2021-11-16 2024-07-17 ZF CV Systems Global GmbH Auspuff eines gehäuses zur aufnahme von elektronischen komponenten einer pneumatischen vorrichtung
CN120268128B (zh) * 2025-06-10 2025-09-02 杭州爱华仪器有限公司 一种户外机箱除尘除水装置

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EP1625373A1 (de) 2006-02-15
JP4917427B2 (ja) 2012-04-18
US8105408B2 (en) 2012-01-31
WO2004099749A8 (en) 2006-11-23
GB2401330A (en) 2004-11-10
EP1625373B1 (de) 2010-10-20
ES2354879T3 (es) 2011-03-18
JP2006525908A (ja) 2006-11-16
CN101706342B (zh) 2012-02-08
US20110049399A1 (en) 2011-03-03
ATE485500T1 (de) 2010-11-15
KR101121765B1 (ko) 2012-03-23
KR20060030851A (ko) 2006-04-11
CN101706342A (zh) 2010-05-12
WO2004099749A1 (en) 2004-11-18
CN1806163A (zh) 2006-07-19
GB2401330B (en) 2006-04-12
GB0310701D0 (en) 2003-06-11

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