WO1999021641A1 - A method and device at an air drier - Google Patents

A method and device at an air drier Download PDF

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Publication number
WO1999021641A1
WO1999021641A1 PCT/SE1998/001855 SE9801855W WO9921641A1 WO 1999021641 A1 WO1999021641 A1 WO 1999021641A1 SE 9801855 W SE9801855 W SE 9801855W WO 9921641 A1 WO9921641 A1 WO 9921641A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
return valve
compartment
pressure
desiccant
Prior art date
Application number
PCT/SE1998/001855
Other languages
French (fr)
Inventor
Sven-Olof Larson
Original Assignee
Haldex Brake Products Ab
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 Haldex Brake Products Ab filed Critical Haldex Brake Products Ab
Priority to AU95636/98A priority Critical patent/AU9563698A/en
Publication of WO1999021641A1 publication Critical patent/WO1999021641A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0415—Beds in cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/265—Drying gases or vapours by refrigeration (condensation)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0446—Means for feeding or distributing gases

Definitions

  • the present invention relates to a method and device for removing water from air before its entering into desiccant in an air drier.
  • Air driers are typically used for drying air before its use in different pneumatic systems, such as a brake system or a door operating system of a vehicle.
  • the air coming from an air compressor of the vehicle is normally too wet (and dirty) for being suitable for direct use in the pneumatic systems.
  • Desiccant is used in the air drier as the agent for removing the moist, as is well known in the art .
  • the air from the compressor contains such a large content of water that it is advantageous to remove the free water, before it enters the desiccant .
  • Such a water removal may according to the invention be attained in that the air to be dried is transported under a certain over-pressure into and through a condensation department past an upper non-return valve and that condensated water is removed from the compartment through a lower non-return valve arranged in the bottom thereof and opening downwards as an effect of unloading the space below the bottom from the over-pressure.
  • the single Figure is a cross-sectional view through a vehicle air drier. Except for the aspects having to do with the invention the air drier is conventional, and the description below will be concentrated to portions relevant for the proper understanding of the invention.
  • a shown air drier is of the so called single tower type.
  • a preferably cylindrical container 1, for example of deep-drawn steel plate, is sealingly connected to a base 2 having appropriate channels for the supply of moist air from an air compressor (not shown) and the delivery of dried air to air tanks or other means (not shown) in the vehicle .
  • a replaceable cartridge 3 containing desiccant 4 for drying moist air is arranged in the container 1.
  • the desiccant 4 can be regenerated by already dried air, as is described below. When no further satisfactory regeneration is possible and the useful life of the cartridge 3 has come to its end, it is to be replaced by a new one .
  • Compressed air enters from the base 2 into a slot between the container 1 and the outside of the cartridge 3, as is indicated by arrows 5.
  • the air is cooled down against the container 1, and its velocity is decreased. Free moist or water in the air can condensate and be removed in an appropriate way.
  • This valve may preferably but not necessarily have the form of a rubber sealing ring with a sealing lip 1 " against the outer wall of the cartridge 3.
  • Moist and water in the air can here condensate against this cartridge wall and flow down to the bottom of the cartridge 3, as is indicated by arrows 8.
  • the compartment 6 can accordingly be called a condensation compartmen .
  • the air is again redirected and flows upwards into the desiccant 4, as is indicated by the arrows 9.
  • the desiccant 4 By the passage through the desiccant 4 the remaining moist is removed from the air, which leaves the cartridge 3 through its perforated bottom into the base 2, as is indicated by the arrow 10.
  • an unloading valve (not shown) is opened, so that the pressure in the space between the container 1 and the cartridge 3 but also - due to the presence of a lower non-return valve 11 in the bottom of the compartment 6 - in the cartridge 3 is decreased.
  • the unloading is represented by an arrow 12.
  • the upper non-return valve 7 is closed due to the pressure difference over it, and water collected in the bottom region of the compartment 6 is flushed out through the lower non-return valve 11.
  • the lower non-return valve 11 may preferably but not necessarily have the form of oblong spring washers attached to the underside of the perforated bottom of the compartment 6.
  • a certain amount of dry air is passed backwards through the desiccant 4 for regeneration thereof.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Drying Of Solid Materials (AREA)
  • Drying Of Gases (AREA)

Abstract

Air to be dried in an air drier is transported under a certain over-pressure into and through a condensation compartment (6) past an upper non-return valve (7). Condensated water is removed from the compartment through a lower non-return valve (11) arranged in the bottom thereof and opening downwards as an effect of unloading the space below the bottom from the over-pressure.

Description

A METHOD AND DEVICE AT AN AIR DRIER
Technical Field
The present invention relates to a method and device for removing water from air before its entering into desiccant in an air drier. Background of the Invention
Air driers are typically used for drying air before its use in different pneumatic systems, such as a brake system or a door operating system of a vehicle. The air coming from an air compressor of the vehicle is normally too wet (and dirty) for being suitable for direct use in the pneumatic systems. Desiccant is used in the air drier as the agent for removing the moist, as is well known in the art .
However, in many cases the air from the compressor contains such a large content of water that it is advantageous to remove the free water, before it enters the desiccant .
The Invention
Such a water removal may according to the invention be attained in that the air to be dried is transported under a certain over-pressure into and through a condensation department past an upper non-return valve and that condensated water is removed from the compartment through a lower non-return valve arranged in the bottom thereof and opening downwards as an effect of unloading the space below the bottom from the over-pressure.
The Drawing
The invention will be described in further detail below reference being made to the drawing, in which the single Figure is a cross-sectional view of an air drier according to the invention. Detailed Description of a Preferred Embodiment
The single Figure is a cross-sectional view through a vehicle air drier. Except for the aspects having to do with the invention the air drier is conventional, and the description below will be concentrated to portions relevant for the proper understanding of the invention.
A shown air drier is of the so called single tower type. A preferably cylindrical container 1, for example of deep-drawn steel plate, is sealingly connected to a base 2 having appropriate channels for the supply of moist air from an air compressor (not shown) and the delivery of dried air to air tanks or other means (not shown) in the vehicle .
A replaceable cartridge 3 containing desiccant 4 for drying moist air is arranged in the container 1. When required, the desiccant 4 can be regenerated by already dried air, as is described below. When no further satisfactory regeneration is possible and the useful life of the cartridge 3 has come to its end, it is to be replaced by a new one .
Compressed air enters from the base 2 into a slot between the container 1 and the outside of the cartridge 3, as is indicated by arrows 5. Here, the air is cooled down against the container 1, and its velocity is decreased. Free moist or water in the air can condensate and be removed in an appropriate way.
After redirection the air passes down into a substantially vertical compartment 6 past an upper nonreturn valve 7. This valve may preferably but not necessarily have the form of a rubber sealing ring with a sealing lip 1 " against the outer wall of the cartridge 3.
Moist and water in the air can here condensate against this cartridge wall and flow down to the bottom of the cartridge 3, as is indicated by arrows 8. The compartment 6 can accordingly be called a condensation compartmen .
The air is again redirected and flows upwards into the desiccant 4, as is indicated by the arrows 9. By the passage through the desiccant 4 the remaining moist is removed from the air, which leaves the cartridge 3 through its perforated bottom into the base 2, as is indicated by the arrow 10.
When after a drying period a predetermined maximum pressure in the air system has been attained, an unloading valve (not shown) is opened, so that the pressure in the space between the container 1 and the cartridge 3 but also - due to the presence of a lower non-return valve 11 in the bottom of the compartment 6 - in the cartridge 3 is decreased. The unloading is represented by an arrow 12. At this stage the upper non-return valve 7 is closed due to the pressure difference over it, and water collected in the bottom region of the compartment 6 is flushed out through the lower non-return valve 11. The lower non-return valve 11 may preferably but not necessarily have the form of oblong spring washers attached to the underside of the perforated bottom of the compartment 6.
A certain amount of dry air is passed backwards through the desiccant 4 for regeneration thereof.
When a predetermined minimum pressure has been attained, the unloading valve is again closed, and the described process is repeated.

Claims

1. A method of removing water from air before its entering into desiccant (4) in an air drier, c h a r a c te r i z e d in that the air to be dried is transported under a certain over-pressure into and through a condensation compartment (6) past an upper non-return valve (7) and that condensated water is removed from the compartment (6) through a lower non-return valve (11) arranged in the bottom thereof and opening downwards as an effect of unloading the space below the bottom from the over-pressure .
2. A device in an air drier for removing water from air before its entering into desiccant (4) therein, c h a r a c t e r i z e d by a condensation compartment (6) having an upper non-return valve (7) and in its bottom a lower non-return valve (11), both valves (7, 11) having the same non-return direction.
3. A device according to claim 1, c h a r a c t e ri z e d in that the upper non-return valve (7) is in the form of a sealing ring with a sealing lip (X) engaging a condensating, substantially vertical wall.
4. A device according to claim 1, c h a r a c t e ri z e d in that the lower non-return valve (11) is in the form of spring washers attached to the underside of the perforated bottom of the condensation compartment (6) .
PCT/SE1998/001855 1997-10-29 1998-10-16 A method and device at an air drier WO1999021641A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU95636/98A AU9563698A (en) 1997-10-29 1998-10-16 A method and device at an air drier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9703945-7 1997-10-29
SE9703945A SE9703945L (en) 1997-10-29 1997-10-29 Mode and arrangement of an air dryer

Publications (1)

Publication Number Publication Date
WO1999021641A1 true WO1999021641A1 (en) 1999-05-06

Family

ID=20408783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001855 WO1999021641A1 (en) 1997-10-29 1998-10-16 A method and device at an air drier

Country Status (3)

Country Link
AU (1) AU9563698A (en)
SE (1) SE9703945L (en)
WO (1) WO1999021641A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7625437B2 (en) 2004-12-10 2009-12-01 Haldex Brake Products Gmbh Cartridge for cleaning compressed air in compressed air supply systems of motor vehicles
DE102010002243B4 (en) * 2010-02-23 2017-06-22 Haldex Brake Products Aktiebolag Impurity separation device
WO2017102960A1 (en) * 2015-12-18 2017-06-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Air dryer cartridge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451674B (en) * 1981-08-21 1987-10-26 Bosch Gmbh Robert AIR DUMMATOR FOR PRESSURE AIR CONDITIONS
SE454410B (en) * 1982-09-03 1988-05-02 Bosch Gmbh Robert Air drying
CH685359A5 (en) * 1992-04-23 1995-06-15 Bruno Lamparter Adsorption dryer with easily assembled components

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451674B (en) * 1981-08-21 1987-10-26 Bosch Gmbh Robert AIR DUMMATOR FOR PRESSURE AIR CONDITIONS
SE454410B (en) * 1982-09-03 1988-05-02 Bosch Gmbh Robert Air drying
CH685359A5 (en) * 1992-04-23 1995-06-15 Bruno Lamparter Adsorption dryer with easily assembled components

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7625437B2 (en) 2004-12-10 2009-12-01 Haldex Brake Products Gmbh Cartridge for cleaning compressed air in compressed air supply systems of motor vehicles
DE102010002243B4 (en) * 2010-02-23 2017-06-22 Haldex Brake Products Aktiebolag Impurity separation device
WO2017102960A1 (en) * 2015-12-18 2017-06-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Air dryer cartridge
US10723341B2 (en) 2015-12-18 2020-07-28 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Air dryer cartridge

Also Published As

Publication number Publication date
SE9703945L (en) 1999-04-30
AU9563698A (en) 1999-05-17
SE9703945D0 (en) 1997-10-29

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