EP3066900A1 - Dispositif d'aération et système électrique comportant un tel dispositif d'aération - Google Patents
Dispositif d'aération et système électrique comportant un tel dispositif d'aérationInfo
- Publication number
- EP3066900A1 EP3066900A1 EP14806011.4A EP14806011A EP3066900A1 EP 3066900 A1 EP3066900 A1 EP 3066900A1 EP 14806011 A EP14806011 A EP 14806011A EP 3066900 A1 EP3066900 A1 EP 3066900A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vent
- filter
- air
- hydrophilic
- ventilation device
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/30—Ventilation or drainage of lighting devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V31/00—Gas-tight or water-tight arrangements
- F21V31/03—Gas-tight or water-tight arrangements with provision for venting
-
- 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
- H05K5/0216—Venting plugs comprising semi-permeable membranes
Definitions
- TITLE Aeration device and electrical system comprising such a ventilation device
- the invention generally relates to the field of air management confined in a housing including in particular a heat source.
- the invention finds particular application in the automotive field, where power electrical circuits are often enclosed in a housing.
- vapor refers to water in gaseous form contained in the air.
- moisture refers to water in liquid form contained in the air, for example in the form of fine droplets suspended in the air. Water molecules in liquid form are usually much larger than water molecules in gaseous form.
- hydrophilic refers to the property of a material consisting of capturing water vapor, for example contained in air.
- hydrophobic refers to the property of a material consisting of repelling moisture, for example contained in air.
- oleophobic refers to the property of a material consisting of repelling fats and oils, for example contained in the air.
- Automotive power equipment usually has a housing in which electrical power components are enclosed. In operation, these components give off heat, which causes an expansion of the indoor air and an increase in the internal pressure of the housing. This pressure variation with respect to the external air pressure generates a force on the hood and the housing seals, which may cause the casing to rupture more or less long-term.
- a break in tightness has a strong impact on the functional parts of the equipment. It allows in particular the intrusion of contaminating elements such as water, dust, etc. This intrusion accelerates the oxidation of metals, deteriorates the quality of electrical contacts, promotes electro-migration and reduces electrical insulation. It can also cause strong impacts on the safety of the vehicle users by creating insulation breaks between the high voltage electrical conductors and the housing itself directly in contact with the chassis.
- the housing with a pressure equalization vent connected to a hose pointing downwards.
- the pressure equalizing vent maintains the internal pressure of the housing the same as the ambient pressure, but does not prevent the penetration of moisture into the housing.
- valves to "depressurize" a housing. These valves are sometimes equipped with a hydrophobic textile to filter the particles and moisture contained in the outside air to prevent them from entering the housing. However, they do not prevent the entry of water vapor.
- desiccants in the form of capsules containing chemical reagents for absorbing water vapor contained in a housing by means of a chemical reaction modifying the structure of the reagents.
- WO 02 077522 A2 discloses the use of desiccant. More specifically, this document describes a ventilation device attached to a housing and having a first vent on the inside of the housing, a second vent on the outside of the housing, and a desiccant vaporizer filter for vaporizing a flow of air passing through the aeration device from the first vent to the second vent.
- Desiccants however, present different problems. First, their absorptive power deteriorates over time. In addition, the reagents saturate beyond a certain amount of absorbed water. Thus, it is necessary to periodically renew the desiccant, which is not always easily possible.
- a ventilation device in particular for a housing of an electrical system, characterized in that it comprises:
- a dehumidifier filter for dehumidifying the second air flow before passing through the vaporizer filter.
- the vaporizer filter comprises a hydrophilic material for capturing the water vapor contained in the first and second air streams.
- the dehumidifier filter comprises a hydrophobic material for repelling the moisture contained in the second air stream.
- the dehumidifier filter is further intended to filter the liquid particles of oil and grease.
- the hydrophobic material is furthermore an oleophobic material for repelling oil and greases.
- the third vent is separate from the second vent and the aeration device further comprises a valve for allowing the passage of the first air flow to the second vent without passing through the dehumidifier filter, and to prevent the air inlet into the aeration device through the second vent.
- the third vent is coincident with the second vent and the dehumidifier filter is further intended to dehumidify the first air stream after passing through the vaporizer filter.
- the third vent is coincident with the second vent and the aeration device further comprises a valve having at least one opening obstructed by the dehumidifier filter, the valve being intended to allow the passage of the first air flow until at the second vent without passing through the dehumidifier filter, and to prevent the entry of air into the aeration device by the second vent other than through the dehumidifier filter.
- the invention also relates to a ventilation device, in particular for a housing of an electrical system, characterized in that it comprises:
- a dehumidifying filter intended to dehumidify the second flow of air before it passes through the vaporizer filter
- said vaporizing filter comprising a hydrophilic film, or a hydrophilic perforated film, or a hydrophilic membrane, or a hydrophilic textile, or a hydrophilic fiber mat.
- This aeration device may comprise any of the features described above.
- this aeration device may include one or more of the following features: the hydrophilic film, the hydrophilic perforated film, the hydrophilic membrane, the hydrophilic textile, or the hydrophilic fiber mat are obtained by applying a surface coating with a pattern of hydrophilic regions and hydrophobic regions at the nanometer scale ;
- the third vent is distinct from the second vent
- the third vent is coincident with the second vent
- the ventilation device further comprises a valve intended to allow the passage of the first air flow to the second vent without passing through the dehumidifying filter, and to prevent the entry of air into the ventilation device by the second vent;
- the valve has at least one opening obstructed by the dehumidifier filter; in particular the valve being intended to allow the passage of the first air flow to the second vent without passing through the dehumidifier filter, and to prevent the entry of air into the aeration device by the second vent other than by passing through the dehumidifier filter;
- the dehumidifier filter is also intended to dehumidify the first air flow after passing through the filter vaporizer.
- a ventilation device mounted on a wall of the housing.
- the electrical system further comprises a device for cooling the internal air of the housing.
- Figure 1 shows, in a simplified view, an electrical system according to the invention.
- FIG. 2 represents, in a sectional view, a first ventilation device according to the invention forming part of the electrical system of FIG.
- FIG. 3 represents, in a three-dimensional view, the aeration device of FIG. 2 in a disassembled configuration and in the absence of a dehumidifying filter.
- Figure 4 shows, in a three-dimensional sectional view, the aeration device of Figure 2 during an air expulsion phase.
- Figure 5 shows, in a three-dimensional sectional view, the aeration device of Figure 2 during an air intake phase.
- Figure 6 shows, in a sectional view, a second aeration device according to the invention.
- Figure 7 shows, in a sectional view, a third aeration device according to the invention.
- the electrical system 100 is an electrical power system for a motor vehicle.
- the electrical system 100 firstly comprises a housing 102 filled with internal air 104 and surrounded by external air 106.
- the electrical system 100 further comprises electrical components 108 enclosed in the housing 102.
- the electrical system 100 further comprises a device 110 for cooling the internal air 104.
- the electrical system 100 further comprises a ventilation device 112 mounted on a wall 114 of the housing 102.
- a ventilation device 112 mounted on a wall 114 of the housing 102.
- the ventilation device 112 is placed partly in a perforation 202 formed in the wall 114 of the housing 102 and is intended to allow air to circulate between the internal air 104 and the external air 106.
- the ventilation device 112 first comprises a body 204 comprising a conical portion 206.
- the conical portion 206 is hollow so as to delimit a cavity 208.
- the conical portion 206 has, at its apex, a small opening constituting a vent subsequently referred to as the inner vent 210.
- the inner vent 210 is located in front of or in the perforation 202 and allows air to circulate between the cavity 208 and the internal air 104.
- the conical portion 206 is further pierced by lateral openings together forming a vent subsequently called external inlet vent 212 allowing air to flow from the external air 106 to the cavity 208.
- the conical portion 206 has a large opening 214 covered by a cover 216 of the ventilation device 112.
- the cover 216 is circular and provided with clips 218 for attachment to the conical portion 206.
- the cover 216 has peripheral openings together forming a vent subsequently referred to as the external outlet vent 220.
- the outward outlet vent 220 allows air to flow from the cavity 208 to the external air 106.
- the ventilation device 112 further comprises a vaporizing filter 222 obstructing the internal vent 210 so as to filter the air flowing between the cavity 208 and the internal air 104.
- the vaporizing filter 222 comprises, for example, a hydrophilic material intended to capture, usually in liquid form, the water vapor (that is to say the water molecules in gaseous form) contained in the air. Unlike desiccants, the molecular structure of the hydrophilic material does not undergo a chemical reaction and remains the same during capture.
- Spray filter 222 comprises for example a hydrophilic film, or a hydrophilic perforated film, or a hydrophilic membrane, or a hydrophilic textile, or a hydrophilic fiber mat.
- Spray filter 222 captures at least a portion of the water vapor from the air, for example at least 10%.
- the vaporizing filter 222 is preferably sized for lowering the percentage of water vapor in the internal air 104 so that the lowest temperature of the indoor air 104 (found generally in the vicinity of the cooling device 110) remains higher than the dew point.
- the dew point or dew point is the lowest temperature at which a mass of air can be subjected, at a given pressure and percentage of water vapor, without saturation water formation occurring. .
- the risk of condensation on the cold surfaces of the housing 102 is reduced.
- the vaporizing filter 222 has the shape of a disc centered on the inner vent 210.
- the ventilation device 112 further comprises a dehumidifier filter 224 obstructing the external inlet vent 212 so as to filter the air flowing between the external air 106 and the cavity 208.
- the dehumidifier filter 224 comprises, for example, a material hydrophobic agent for repelling moisture (that is, water molecules in liquid form) contained in the air.
- the dehumidifier filter 224 is also intended to filter the molecules of oils and fats in liquid form and / or hydrocarbon in liquid form and / or dust.
- the hydrophobic material is for example also oleophobic.
- the dehumidifying filter 224 comprises, for example, a hydrophobic film, or a hydrophobic membrane, or a hydrophobic textile, or a hydrophobic fiber mat. These elements are for example obtained by applying a surface coating on the film, membrane, textile, mattress, etc.
- the substrate film, membrane, textile, mattress, etc.
- the substrate is of the same nature as that used for the vaporizing filter 222, only the surface coating changing from one to the other.
- the two filters 222, 224 are glued or heat welded so that they obstruct their respective vents, so that the air passing through these vents has no other solution than to switch to through filters.
- the dehumidifying filter 224 has the shape of a flat ring extending around the vaporizing filter 222 and covering the openings forming the external inlet vent 212.
- the ventilation device 112 further comprises a valve 226.
- the valve 226 is in the form of a flexible disk and is fixed at its center to the lid 216, on the side of the cavity 208.
- the valve 226 is thus interposed between the cavity 208 and the external output vent 220.
- the periphery of the valve 226 rests on a flange 228 of the conical portion 206 delimiting the large opening 214.
- the valve 226 is intended to allow the passage of air from the cavity 208 to the outlet external vent 220, and to prevent the entry of external air 106 into the cavity 208 through the outlet external vent 220.
- the valve 226 is for example made of silicone and held on the lid 216 by a fixing for example type bouterollage. Silicone has the advantage of being resistant to external aggressions, aging and staying flexible over a wide temperature range, generally from -50 ° C to 180 ° C.
- the body 204 includes fixing arms 230 fixing the ventilation device 112 to the housing 102.
- the fixing arms 230 extend from the periphery of the inner vent 210, pass through the perforation 202 of the wall 114 and are clipped on the inner face of the wall 114.
- the ventilation device 112 further comprises a seal 232 disposed between the body 204 and the thickness of the perforation 202 of the wall 114 to ensure a sealed circulation through the internal vent 210.
- the seal 232 surrounds the fastening arms 230, close to the inner vent 210.
- the ventilation device 108 comprises no other openings between the cavity 208 and the outside of the ventilation device 108 than those already described, namely: the internal vent 210, the vent external inlet 212 and external outlet vent 220.
- the electrical system 100 In a first phase of rest, the electrical system 100 has been off for some time.
- the temperature of the internal air 104 is equal to the temperature of the external air 106.
- the electrical system 100 is turned on and the electrical components 108 give off heat, while the cooling device 110 cools the internal air 104.
- the Internal air 104 rises in temperature and, as a result, expands.
- the internal air 104 is then overpressurized with respect to the external air 106, which creates an expelled airflow 402 passing through the aeration device 112 from the interior vent 210 to the outflow external vent 220.
- the expelled airflow 402 first passes through the vaporizer filter 222.
- the expelled airflow 402 is generally so strong and hot that it evaporates and carries with it by convection at least a portion of the vapor stored in the vaporizer filter 222, which avoids saturation of the latter.
- the expelled airflow 402 travels through the cavity 208 and, due to its force, raises the periphery of the valve 226 to continue its path to the outgoing outlet vent 220, through which the expelled airflow 402 exits the device.
- the expelled airflow 402 does not pass through the dehumidifier filter 224 which could maintain the humidity in the cavity 208, which is undesirable.
- the electrical system 100 In a third phase of equilibrium, the electrical system 100 reaches a steady state in which the temperature of the internal air 104 remains higher than the temperature of the external air 106, at a relatively constant value.
- the electrical system 100 is off.
- the temperature of the internal air 104 then drops, which creates a vacuum in the housing 102 and an external air suction 106.
- This suction results in a suction air flow 502 through the ventilation device 112 since the external inlet vent 212 to the interior vent 210.
- the intake air stream 502 passes through the dehumidifier filter 224, travels through the cavity 208, then passes through the vaporizer filter 222 to continue its path to the interior vent 210 by which the sucked air flow 502 exits the aeration device 112 to join the internal air 104.
- valve 226 prevents the external air 106 from reaching the cavity 208 through the external outlet vent 220, thereby forcing the external air to pass through the dehumidifier filter 224. .
- the electrical system 100 then returns to the first rest phase.
- the ventilation device 600 may be installed in the electrical system 100 in place of the aeration device 112.
- the ventilation device 600 is similar to the ventilation device 112, so that identical references are given to the common elements. and that they will not be described again.
- the conical portion 206 of the aeration device 600 does not have the external inlet vent 212, the dehumidifier filter 224, or the valve 226.
- the ventilation device 600 comprises a dehumidifying filter 602, for example similar to the dehumidifier filter 224, obstructing the large opening 214 and interposed between the cavity 208 and the cover 216.
- the dehumidifier filter 602 has the shape of a disc fixed at its periphery to the flange 228.
- the external air 106 is intended to enter the aeration device 600 through the vent 220, which will simply be called in the context of this embodiment "external vent”.
- the ventilation device 600 has no other openings between the cavity 208 and the outside of the ventilation device 108 than those already described, namely: the internal vent 210 and the vent outside 220.
- aeration device 600 for example when installed in the electrical system 100, is similar to that of the aeration device 112 except for the following differences which will now be described.
- the expelled air stream passes through the aeration device 600 from the inner vent 210 to the outer vent 220.
- the expelled air stream passes through the vaporizer filter 222 , traverses the cavity 208, then passes through the dehumidifying filter 602 to continue its path to the external vent 220 through which the expelled air flow out of the aeration device 600 to join the external air 106.
- the fact that the flow of expelled air passes through the dehumidifier filter 604 does not present a great disadvantage, because the water it contains (from the inside air 104 or ripped from the vaporizer filter 222) is in the form of steam due to the high temperature. Thus, the steam can pass through the dehumidifier filter 224 without being retained in the cavity 208.
- the air flow sucked through the dehumidifier filter 602 traverses the cavity 208, then passes through the vaporizing filter 222 to continue its way to the inner vent 210 through which the air flow sucked out of the aeration device 600 to join the internal air 104.
- FIG. 7 another aeration device 700 according to the invention will now be described in detail.
- the aeration device 700 may be installed in the electrical system 100 in place of the aeration device 112.
- the aeration device 700 is similar to the aeration device 112, so that identical references are given to the common elements. and that they will not be described again.
- the conical portion 206 of the aeration device 600 does not have the external inlet vent 212 or the dehumidifier filter 224.
- the valve 226 has openings 702 obstructed by a dehumidifying filter 704, for example similar to the dehumidifier filter 224.
- the valve 226 is for example molded around the dehumidifier filter 704 so that the regions of the dehumidifier filter 704 are not These regions form the openings 702.
- the external air 106 is intended to enter the aeration device 700 through the vent 220, which will simply be called in the context of this embodiment "external vent”.
- the ventilation device 700 comprises no other opening between the cavity 208 and the outside of the ventilation device 108 than those already described, namely: the internal vent 210 and the vent outside 220.
- aeration device 700 for example when installed in the electrical system 100, is similar to that of the aeration device 112 except for the following differences which will now be described.
- the sucked air flow passes through the aeration device 600 from the outer vent 220 to the inner vent 210. Due to the valve 226, the sucked air flow passes through the dehumidifier filter 704, passes through the cavity 208, then passes through the vaporizing filter 222 to continue its way to the inner vent 210 through which the air flow sucked out of the aeration device 700 to join the internal air 104.
- the electrical system 100 is sealed, in particular the housing 102, which means that it does not involve communications with the outside other than that (s) provided by one or more aeration devices according to the invention, optionally associated with one or more pressure equalization vents, each connected or not to a hose directed downwards, and / or one or more pressure relief valve.
- the ventilation devices 112, 600, 700 make it possible to integrate the decompression functions of the housing 102, of filtering moisture and particles, but also of absorbing anti-condensation moisture in a single device.
- the aeration devices 112, 600, 700 therefore have a more durable operation than the desiccant capsules. In particular, they evacuate the water vapor instead of storing it without requiring more additional assembly operation than the desiccant capsules.
- the invention it is possible to reduce the anti-humidity coating application of the printed circuit boards of the electrical components, and thus reduce the corresponding costs.
- the integration of the ventilation devices according to the invention to the electrical systems is not more difficult to achieve than the integration of pressure equalization vents or pressure relief valves.
- the invention does not entail significant additional cost.
- the invention improves the reliability of the power electronics over time.
- the present invention is not limited to the embodiments described above, but is instead defined by the following claims. It will be apparent to those skilled in the art that modifications can be made to the previously described embodiments.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Drying Of Gases (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1360922A FR3012938B1 (fr) | 2013-11-07 | 2013-11-07 | Dispositif d'aeration et systeme electrique comportant un tel dispositif d'aeration |
PCT/FR2014/052811 WO2015067888A1 (fr) | 2013-11-07 | 2014-11-05 | Dispositif d'aération et système électrique comportant un tel dispositif d'aération |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3066900A1 true EP3066900A1 (fr) | 2016-09-14 |
Family
ID=50137791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14806011.4A Withdrawn EP3066900A1 (fr) | 2013-11-07 | 2014-11-05 | Dispositif d'aération et système électrique comportant un tel dispositif d'aération |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3066900A1 (fr) |
FR (1) | FR3012938B1 (fr) |
WO (1) | WO2015067888A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7034581B2 (ja) * | 2016-08-30 | 2022-03-14 | 日東電工株式会社 | 通気部材 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140160680A1 (en) * | 2012-12-11 | 2014-06-12 | Hzo, Inc. | Vapor ports for electronic devices |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2177016B (en) * | 1985-05-29 | 1988-06-22 | Eps Group Ltd | Improved breather desiccator for closed container |
US6709493B2 (en) * | 2001-03-26 | 2004-03-23 | Gore Enterprise Holdings, Inc. | Device for reducing the presence of moisture within an enclosure containing a heat source |
-
2013
- 2013-11-07 FR FR1360922A patent/FR3012938B1/fr active Active
-
2014
- 2014-11-05 EP EP14806011.4A patent/EP3066900A1/fr not_active Withdrawn
- 2014-11-05 WO PCT/FR2014/052811 patent/WO2015067888A1/fr active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140160680A1 (en) * | 2012-12-11 | 2014-06-12 | Hzo, Inc. | Vapor ports for electronic devices |
Also Published As
Publication number | Publication date |
---|---|
FR3012938A1 (fr) | 2015-05-08 |
WO2015067888A1 (fr) | 2015-05-14 |
FR3012938B1 (fr) | 2018-01-26 |
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