WO2015195092A1 - Dérivation de post-refroidisseur de compresseur à séparateur d'eau intégré - Google Patents

Dérivation de post-refroidisseur de compresseur à séparateur d'eau intégré Download PDF

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Publication number
WO2015195092A1
WO2015195092A1 PCT/US2014/042672 US2014042672W WO2015195092A1 WO 2015195092 A1 WO2015195092 A1 WO 2015195092A1 US 2014042672 W US2014042672 W US 2014042672W WO 2015195092 A1 WO2015195092 A1 WO 2015195092A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
mixing chamber
aftercooler
valve
temperature
Prior art date
Application number
PCT/US2014/042672
Other languages
English (en)
Inventor
Eric C. Wright
Original Assignee
New York Air Brake, LLC
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 New York Air Brake, LLC filed Critical New York Air Brake, LLC
Priority to CA2950691A priority Critical patent/CA2950691C/fr
Priority to CN201480079914.XA priority patent/CN106460819B/zh
Priority to PCT/US2014/042672 priority patent/WO2015195092A1/fr
Publication of WO2015195092A1 publication Critical patent/WO2015195092A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/16—Filtration; Moisture separation

Definitions

  • the present invention relates to compressor aftercooler bypass systems and, more particularly, to an aftercooler bypass having integral water separator.
  • railway braking systems rely on, among other things, air compressors to generate the compressed air of the pneumatic braking system.
  • air compressors are generally provided with an aftercooler to cool the compressed air to 20° F to 40° F above ambient temperature.
  • the cooled, compressed air is then supplied to the air supply system of a locomotive through a compressor discharge pipe that connects to the first main reservoir.
  • This discharge pipe may be as long as 30 feet, and may necessarily include several ninety degree bends.
  • the maximum total amount of water vapor in a volume of air is strongly dependent on the air temperature, as warm air is able to hold much more water vapor than cool air. This effect is characterized as the partial pressure saturation pressure.
  • the water vapor saturation partial pressure is the maximum water vapor in air at that temperature, regardless of air pressure. As air is compressed, the water vapor in the air will also be compressed, until the water vapor partial pressure equals the saturation pressure. The net result is that for a railway compressor with a 10.5: 1 compression ratio, intake air as dry as 9.5 percent relative humidity will be at 100 percent relative humidity after compression.
  • the second stage discharge temperature may be as high as 300 °F above ambient temperature.
  • the hot air discharged from the second stage of an air compressor may contain a significant amount of water vapor.
  • the air temperature is reduced to 20° F to 40° F above ambient temperature. Air at this temperature can hold much less water vapor than air at the second stage discharge temperature, so the excess water vapor precipitates out as liquid water and/or water aerosol.
  • this liquid water is transported into the compressor discharge pipe, it may freeze if the discharge pipe and ambient air are cold enough.
  • the air exiting the compressor is 20° F to 40° F above ambient air temperature, it is subject to further cooling in the compressor discharge pipe. As the air temperature drops in the pipe, further water will precipitate out thereby compounding the problem.
  • the present invention comprises an air compressor for railway braking system that includes an integrated aftercooler bypass valve and integral water separator to prevent freezing of the compressor discharge pipe in winter operation.
  • An integrated aftercooler bypass valve controllably connects the outlet of the second stage of the compressor to the outlet of the aftercooler. When the aftercooler bypass valve is open, then a fraction of the hot air from the compressor second stage outlet flows to the mixing chamber of the aftercooler bypass valve assembly, thereby bypassing the aftercooler. The remaining fraction of the hot air from the compressor second stage outlet flows through the aftercooler and is cooled to a temperature of 20° F to 40° F above ambient temperature as in conventional aftercooling systems.
  • This cooled fraction of air from the aftercooler is directed to a second inlet port on the aftercooler bypass valve assembly to the mixing chamber, where it is mixed with the hot air from the first fraction of air.
  • the combined air has a new temperature which is a mass- temperature average of the two air streams and the new outlet air temperature is the result of the relative mass flow of the two air streams, which is a consequence of the flow capacity of the open bypass valve.
  • the flow capacity of the open bypass valve could be selected to provide a new, mixed compressor outlet temperature of 140° F above ambient temperature so that even if the ambient air temperature was -40° F, the outlet air temperature presented to the discharge pipe would be 100° F.
  • the outlet air temperature can therefore be selected to have a high-enough temperature so that even after flowing through the cold discharge pipe the air has sufficient heat that it remains above 32° F, thus preventing freezing in the pipe.
  • the bypass valve When the bypass valve is closed, all of the hot air from the compressor second stage outlet flows through the aftercooler and is cooled to a temperature of 20° F to 40° F above ambient temperature.
  • the aftercooler bypass valve is controlled to be opened or closed depending on optionally either ambient temperature and/or the compressor system outlet temperature. When the ambient temperature is below a threshold, such as 32° F, then the aftercooler bypass valve is opened. At temperatures above the control temperature, the aftercooler bypass valve is closed.
  • the aftercooler bypass valve assembly optionally includes an integral water separator to remove the liquid and aerosol water from the outlet air stream.
  • an integral water separator to remove the liquid and aerosol water from the outlet air stream.
  • Figure 1 is a perspective view of an aftercooler bypass system according to the present invention.
  • Figure 2 is a flow diagram of an aftercooler bypass system according to the present invention.
  • Figure 3 is a cross-sectional view of an embodiment of a bypass valve according to the present invention.
  • FIG. 1 an after cooler bypass system 10.
  • System 10 is interconnected to an air compressor 12 via a connector duct 14 that is fluidly interconnected to the second stage outlet 16 of compressor 12 so that at least a portion of the air exiting compressor 12 may be redirected to system 10 away from the aftercooler inlet pipe 18 of a conventional aftercooler 20.
  • Connector duct 14 diverts the compressed air exiting outlet 16 of air compressor 12 to a bypass valve assembly 22 having a mixing chamber 24.
  • Valve assembly 22 is also is interconnected to the discharge flange 34 of aftercooler 20, so that cooled air exiting aftercooler 20 may be intermixed with the hot air diverted by connector duct 14.
  • Valve assembly 22 further comprises a bypass valve 26 that may be selectively opened or closed, or at least partially opened, based on a threshold, such as the ambient air temperature.
  • Valve assembly 22 preferably comprises a water separator 28 attached thereto and positioned proximately to mixing chamber 24 to assist with the removal of water from the intermixed air streams.
  • the intermixed air in mixing chamber 24 may then be provided to the braking system via an outlet flange 42 that can connect to the conventional discharge piping used to conduct compressed air to the main reservoir of the braking system.
  • bypass valve 26 When bypass valve 26 is closed, the cooled compressed air exiting aftercooler 20 will still pass through mixing chamber 24 so that water separator 28 can remove any undesired water and then exit to the braking system via flange 42.
  • Bypass valve 26 is preferably dimensioned to provide a predetermined mixing ratio of bypassed air and thus result in a predetermined outlet temperature above ambient temperature when ambient air temperatures fall below as threshold, such as freezing.
  • valve 26 may be controlled to adaptively maintain mixed air temperature based on the ambient air temperature.
  • aftercooler bypass valve assembly 22 may be formed as a single, integral unit that may be installed or replaced as a single unit for easer installation or repair in the field.
  • bypass valve 26 selectively allows compressed air leaving compressor 12 to bypass aftercooler 20 and then intermix with the cooled air leaving aftercooler 20 by discharge flange 34.
  • bypass valve assembly 22 provides a direct and short bypass of aftercooler 20 so that when bypass valve 26 is open, the flow resistance through bypass valve assembly 22 is less than the flow resistance through aftercooler 20.
  • a substantive fraction of hot air will preferentially flow through bypass valve 26 into mixing chamber 24.
  • This arrangement is significantly simpler and less costly than conventional approaches that necessitate the use of a three-way valve to simultaneously block the connection to an aftercooler while opening another connection to an aftercooler bypass line.
  • water separator 28 preferably includes an automatic drain valve 30 to expel liquid and aerosol water from the outlet air stream. While drain valve 30 is shown schematically in Fig. 2 as a solenoid valve on the bottom of the reservoir 32 of water separator 28, drain valve 30 could additionally comprise a pneumatically piloted drain valve at the bottom of the reservoir, with the controlling solenoid integrated into the block of aftercooler bypass valve 22. Reservoir 32 of water separator 28 may include an integral, pneumatic connection between the solenoid valve 30 in the valve block and the
  • bypass valve 26 could be formed using a suitable two-way valve known in the art, bypass valve 26 may also be made in the same manner as the unloading valves 64 of the cylinder heads of air compressor 12, as these valves are designed to operate reliably at the high temperature and pressure of the second stage cylinder outlet. For example, as seen in Fig.
  • bypass valve 26 may comprise a housing 50 having a control input 52 for controlling the position of a valve 54 positioned within housing 50 and biased by one or more springs 56 for movement between a closed position, where valve 52 engaged a seat 58 formed in housing 50, and an open position, where valve 52 allow an inlet port 60 to be in communication with an outlet port 62.
  • valve 54 and seat 58 form a metal to metal contact for reliable operation at the high temperatures and pressures associated with system 10.
  • Inlet port 60 is interconnected to second stage outlet 16 of compressor 12 by connector duct 14, and outlet port 62 is interconnected to mixing chamber 24.
  • bypass valve 26 could optionally be a proportional valve that would allow the outlet temperature of aftercooler 20 to be controlled over a range of temperatures.
  • the outlet temperature could be controlled by an associated controller 36 having an ambient air thermometer 38, or comparable sensor, as well as an inline temperature sensor 40 downstream of mixing chamber 24.
  • the outlet temperature could be set to 100° F whenever the ambient temperature is at or below freezing by varying the opening of aftercooler bypass valve 26 to provide the needed high temperature air flow to mixing chamber 24.
  • bypass valve 26 and controller 36 may be configured to provide closed-loop control of the outlet temperature, thereby providing a variable mixing ratio and a controllable outlet temperature independent of ambient temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

L'invention concerne un système de dérivation de post-refroidisseur pour permettre de manière sélective à une partie des gaz comprimés chauds sortant d'un compresseur d'air de contourner un post-refroidisseur et de se mélanger aux gaz comprimés refroidis sortant du post-refroidisseur, de façon à s'assurer que les gaz comprimés refroidis soient au-dessus d'une température seuil lorsque la température de l'air ambiant atteint la température de gel ou une température inférieure à cette dernière. Le système comprend une soupape pour commander la quantité d'air déviée autour du post-refroidisseur et une chambre de mélange pour permettre à l'alimentation en air à soupape de se mélanger au flux de sortie de post-refroidisseur. Un capteur de température peut être utilisé pour mesurer la température de l'air ambiant et la température de l'air en aval afin de commander l'ouverture et la fermeture de la soupape et maintenir la température de l'air mélangé souhaitée.
PCT/US2014/042672 2014-06-17 2014-06-17 Dérivation de post-refroidisseur de compresseur à séparateur d'eau intégré WO2015195092A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2950691A CA2950691C (fr) 2014-06-17 2014-06-17 Derivation de post-refroidisseur de compresseur a separateur d'eau integre
CN201480079914.XA CN106460819B (zh) 2014-06-17 2014-06-17 具有一体式水分离器的压缩机后冷却器旁路
PCT/US2014/042672 WO2015195092A1 (fr) 2014-06-17 2014-06-17 Dérivation de post-refroidisseur de compresseur à séparateur d'eau intégré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2014/042672 WO2015195092A1 (fr) 2014-06-17 2014-06-17 Dérivation de post-refroidisseur de compresseur à séparateur d'eau intégré

Publications (1)

Publication Number Publication Date
WO2015195092A1 true WO2015195092A1 (fr) 2015-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/042672 WO2015195092A1 (fr) 2014-06-17 2014-06-17 Dérivation de post-refroidisseur de compresseur à séparateur d'eau intégré

Country Status (3)

Country Link
CN (1) CN106460819B (fr)
CA (1) CA2950691C (fr)
WO (1) WO2015195092A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3071255C (fr) * 2017-08-15 2020-09-01 New York Air Brake Llc Systeme de degivrage pour refroidisseur final de compresseur d'air
CN108708843A (zh) * 2018-05-16 2018-10-26 昆山钜全金属工业有限公司 一种压缩空气循环系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5927399A (en) * 1997-04-15 1999-07-27 Westinghouse Air Brake Company Aftercooler with integral bypass line
US6045197A (en) * 1998-09-15 2000-04-04 Haldex Brake Corporation Aftercooler with thermostatically controlled bypass
US6283725B1 (en) * 1997-07-21 2001-09-04 Westinghouse Air Brake Company Aftercooler bypass means for a locomotive compressed air system
US6540817B1 (en) * 2000-02-18 2003-04-01 Nabco, Ltd Hollow fiber membrane dehumidification device
WO2011093135A1 (fr) * 2010-01-26 2011-08-04 ナブテスコ株式会社 Dispositif à air comprimé pour véhicule ferroviaire

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2257572Y (zh) * 1995-09-29 1997-07-09 西安交通大学 混水式防燃爆压缩机后冷却器
TWI397483B (zh) * 2010-01-26 2013-06-01 Nabtesco Corp 鐵道車輛用空氣壓縮裝置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5927399A (en) * 1997-04-15 1999-07-27 Westinghouse Air Brake Company Aftercooler with integral bypass line
US6283725B1 (en) * 1997-07-21 2001-09-04 Westinghouse Air Brake Company Aftercooler bypass means for a locomotive compressed air system
US6045197A (en) * 1998-09-15 2000-04-04 Haldex Brake Corporation Aftercooler with thermostatically controlled bypass
US6540817B1 (en) * 2000-02-18 2003-04-01 Nabco, Ltd Hollow fiber membrane dehumidification device
WO2011093135A1 (fr) * 2010-01-26 2011-08-04 ナブテスコ株式会社 Dispositif à air comprimé pour véhicule ferroviaire

Also Published As

Publication number Publication date
CA2950691C (fr) 2017-03-07
CN106460819A (zh) 2017-02-22
CN106460819B (zh) 2018-08-21
CA2950691A1 (fr) 2015-12-23

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