CN101137426B - Breather filter for reduction of contaminant diffusion - Google Patents
Breather filter for reduction of contaminant diffusion Download PDFInfo
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- CN101137426B CN101137426B CN2006800073190A CN200680007319A CN101137426B CN 101137426 B CN101137426 B CN 101137426B CN 2006800073190 A CN2006800073190 A CN 2006800073190A CN 200680007319 A CN200680007319 A CN 200680007319A CN 101137426 B CN101137426 B CN 101137426B
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- filter
- top layer
- air
- valve
- breather
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- 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
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/106—Ring-shaped filtering elements
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- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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- 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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4272—Special valve constructions adapted to filters or filter elements
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- 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
- B01D53/0431—Beds with radial gas flow
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/1446—Reducing contamination, e.g. by dust, debris
- G11B33/146—Reducing contamination, e.g. by dust, debris constructional details of filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/25—Coated, impregnated or composite adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- 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
Abstract
The present invention relates to breather filters that can reduce or prevent transmission of contaminants by diffusion. In an embodiment, the invention includes a breather filter (400) assembly including a valve. The valve includes a top layer defining a first aperture (403), a bottom layer defining a second aperture (402), a filter element arranged between the top layer and the bottom layer. The filter element (408) includes filtration media. The top layer (420) can be configured to flex away from the bottom layer (422) creating an air gap between the top layer and filter element. In an embodiment, the invention includes a breather filter (400) including a top layer (420), a bottom layer (422), a filter element (408) disposed between the top layer and the bottom layer, and a valve assembly comprising a first side and a second side. The valve assembly can be configured to change from a closed configuration to an open configuration when an air pressure differential between the first side and the second side exceeds a threshold amount.
Description
The application submitted to as the pct international patent application on February 03rd, 2006; With the Donaldson Company of U.S. national corporation; Inc. name; Applicant as all designated states except that the U.S.; Brian Babcock (United States citizen), Amy Butterfield (United States citizen), Katsushi Isogawa (Japanese citizen), Carl Soldner (United States citizen) be only as the applicant who specifies the U.S., and the priority of No. the 60/649th, 711, the U.S. Provisional Application that requires to submit on February 03rd, 2005.
Technical field
The present invention relates to a kind of filter that is used for electronic shell.More particularly, the present invention relates to reduce and to prevent the breather filter of pollutant through diffusing into.
Background technology
Disc driver is placed in the enclosure so that the required cleaning ambient of optimization operation of equipment to be provided with other electronic equipment usually.But pollutant also possibly get into electronic shell or in shell, producing during use from external source.Comprise particulate, can damage driver gradually, cause performance degradation such as the gas of water vapour and the pollutant of liquid, and in some cases in addition can cause driver suddenly with entirely ineffective.
When disc driver or other electronic equipment during in operation, the common heating of air in the shell also increases the air pressure in the shell.Because the air pressure that increases, if if passage is arranged or do not have gas-tight seal then air can be overflowed from shell.On the contrary, when disc driver or other electronic equipment are out of service, the air in the shell cool down and shell in air pressure reduce.Because the air pressure that reduces is if if having passage or do not have gas-tight seal then air immigration driver.If have pollutant in the air of immigration shell, enclosure can be contaminated.
Breather filter is generally used for preventing because the pollutant that is carried by exchange of air gets into electronic shell.Breather filter can be arranged on the passage top to remove pollutant from the air that gets into shell.A lot of breather filter designs comprise always can supply external environment condition that air passes through and the fluid communication path between the electronic shell inside.Therefore, the removable breather filter that passes of air is with issuable any air pressure difference between balance electronic enclosure and the outside.But, because fluid communication path opens always, pollutant can through in addition do not have the entering of air or the diffusion process of going out moves through this path.
Therefore need a kind ofly reduce or prevent the breather filter of pollutant through diffusing into.
Summary of the invention
The present invention relates to reduce or to prevent that pollutant from getting into the breather filter of electronic shell.In one embodiment, the present invention includes the breather filter assembly, this assembly comprises valve.This valve comprise the top layer that limits first hole, limit the bottom in second hole and be arranged on top layer and bottom between filter element, filter element comprises filter medium.Filter element be attachable to first and one of bottom go up and stop up the inlet air flow path between said top layer and the said bottom.Said top layer only be configured to when the air pressure on said filter assemblies first side during greater than the air pressure on filter assemblies second side deflection between said top layer and said filter element, to form the air gap.
In one embodiment, the present invention includes the breather filter that is used for electronic shell, comprise top layer, bottom and be arranged on top layer and bottom between filter element, and valve module comprises first side and second side.Valve module has to be opened structure and closes structure.Valve module is configured to when the pressure reduction between first side and second side surpasses critical quantity, open structure from closing to construct to change to.
In one embodiment, the present invention includes the valve module that is used for breather filter, comprise top layer that limits a plurality of holes and the bottom that also limits a plurality of holes.Valve module can be configured to take closed position and open position; Make when the closed position top layer and bottom is adjacent one another are and the hole misalignment.At this open position, the air gap separates a part of top layer and a part of bottom.
In one embodiment, the present invention includes the breather filter assembly, it comprises basic unit, valve layer and filtering medium layer.Filtering medium layer can be arranged between basic unit and the valve layer.The valve layer can comprise top layer that limits a plurality of internal holes and the bottom that limits outside flap.Top layer can be adjacent to bottom, and outside flap is arranged on the internal holes top.Outside flap is configured to deflection away from internal holes.
Above summary of the present invention does not also mean that and has described each said embodiment of the present invention.The purpose of this following just accompanying drawing and detailed description.
Description of drawings
Can understand the present invention more fully with reference to accompanying drawing, wherein:
Fig. 1 is the stereogram according to the filter of the embodiment of the invention.
Fig. 2 is the vertical view of the filter of Fig. 1.
Fig. 3 is the cutaway view along line A-A ' intercepting of Fig. 2.
Fig. 4 is the cutaway view according to embodiments of the invention passive valve in off position.
Fig. 5 is the cutaway view of the passive valve of Fig. 4 in open mode.
Fig. 6 is the stereogram according to the filter of the embodiment of the invention.
Fig. 7 is the vertical view of the filter of Fig. 6.
Fig. 8 is the cutaway view along the filter of Fig. 9 of line B-B ' intercepting of Fig. 7.
Fig. 9 is the cutaway view of filter shown in Figure 6, shows the path that air passes filter.
Figure 10 is the cutaway view that is attached to the electronic shell outside according to the filter of the embodiment of the invention.
Figure 11 is the cutaway view that is attached to electronic shell inside according to the filter of the embodiment of the invention.
Figure 12 is the stereogram of the filter shown in Figure 11.
Figure 13 is the cutaway view according to another filter of the embodiment of the invention.
Figure 14 is the amplification view of a part of the filter of Figure 13.
Figure 15 is the cutaway view of a filter part shown in Figure 13, shows the path that air passes filter.
Figure 16 is the cutaway view of a filter part shown in Figure 13, shows the path that air passes filter.
Figure 17 is the cutaway view according to another filter of the embodiment of the invention.
Although principle of the present invention is fit to various modifications and alternative form, illustrates and will describe its details in detail with the mode of instance and accompanying drawing.But should be appreciated that and do not mean that the present invention is limited to described specific embodiment.Opposite the present invention falls into institute's disclosure and claims scope and interior all modifications, equivalent and the substitute of spirit with covering.
The specific embodiment
Should refer to that at the term " valve " of this use flowing of fluid can be by it through opening, close or hindering the device that the moveable part of one or more flowing ports or path begins and stops or slowing down at least.
Term " aggressive valve " in this use should refer to that wherein the outside device of valve itself is passed through in the opening and closing of valve, such as passing through machinery, hydraulic pressure, pneumatic, electronics or the Electromagnetically actuated valve that activates.
Term " passive valve " in this use should refer to the valve that the wherein opening and closing of valve are directly activated by the pressure in the fluid flow stream of valve control.
Term " adsorbent " and " absorbent " in this use should all refer to absorb or sorbing material, only if concrete context has the phase antirepresentation.That is the interactional concrete property between pollutant of, capturing and the filter material is not by reference.
Embodiments of the invention comprise can reduce or prevent the breather filter of pollutant through diffusing into.Some embodiments of the present invention be included in opens when having critical air pressure reduction with can balance air pressure, but when not having critical air pressure reduction close preventing or reduce pollutant through diffusing into breather filter and/or electronic shell.Fig. 1 is the stereogram according to the filter 100 of the embodiment of the invention.Filter 100 has top layer 104 and air valve assembly 102.In certain embodiments, top layer 104 is processed by fluid impermeable material basically, such as the barrier layer.Pressure reduction reaches critical value space-time air-valve assembly 102 and opens between the valve both sides.Air valve assembly 102 can be configured such that critical value setting is at desired pressure reduction.
Fig. 2 is the vertical view of the filter of Fig. 1.Air valve assembly 102 is arranged on top layer 104 middle parts.But, be to be understood that air valve assembly 102 also can squint from top layer 104 middle parts.Fig. 3 is the cutaway view that is attached to electronic shell 112 along the filter 100 of Fig. 1 of line A-A ' intercepting of Fig. 2.Should be appreciated that filter 100 can use any routine techniques, comprise and use binding agent and mechanical fixed part to be attached to electronic shell 112.Air valve assembly 102 is aimed at the breather port 110 in the electronic shell 112.The top layer 104 of filter is adjacent to the inner surface 114 of electronic shell 112.Therefore, in the embodiment shown, filter is attached to the inside of electronic shell 112.But, should be appreciated that the outside that also is attachable to electronic shell 112 at other embodiment middle filtrator.The perimeter edge of top layer 104 is attached to the perimeter edge of bottom 106.
In certain embodiments, air valve assembly 102 is just opened when only the air pressure on the top side 116 of air valve assembly 102 is than the big critical quantity of air pressure on the bottom side 118 of air valve assembly 102.In other embodiments, valve module 102 is just opened when only the air pressure on the top side 116 of air valve assembly 102 is than the little critical quantity of air pressure on the bottom side 118 of air valve assembly 102.Stating is among other embodiment, and the air pressure of valve module 102 on the top side 116 of air valve assembly 102 opened during big or little critical quantity than the air pressure on the bottom side 118 of air valve assembly 102.
It is inner that electronic shell such as the disc driver housing is used in the electronic unit that diminishes gradually.Therefore, for breather filter, be more greatly favourable unlike necessity.In certain embodiments, the gross thickness of breather filter is less than about 5 millimeters.In a particular embodiment, the gross thickness of breather filter is less than about 3mm, alternatively less than 2mm, and in certain embodiments less than 1mm.Filter shown in Fig. 3 can be used for making air can pass as required to prevent between electronic shell is inside and outside, setting up big pressure reduction.For example; When the air pressure on the bottom 118 of air valve assembly 102 during greater than the air pressure on the top 116 of air valve assembly, air can pass bottom 106, filter element 108 and air valve assembly 102 and flow out the breather port 110 on the electronic shell 112 then.When air flows out like this, in case close less than critical quantity air valve assembly 102 across the pressure reduction reduction and the pressure reduction of air valve assembly 102.On the contrary; When the air pressure on the top 116 of air valve assembly during less than the air pressure on the bottom 118 of air valve assembly 102; Air can pass breather port 110, air valve assembly 102, filter element 108, bottom 106 and get into electron shell body 112, and balance is across the air pressure of valve module 102.
Filter shown in Fig. 3 is compared the amount that can reduce to be diffused into from the outside pollutant of electronic shell with the breather filter that comprises the fluid flowing path of opening always.Reason is when air valve assembly 102 in off position the time, because air valve assembly 102 physically blocks the path, the amount of pollutant that can feed the electronics enclosure interior is relatively little.In addition, can be used for absorbing can be through any pollutant of air valve assembly 102 diffusions for filter element 108 (even time) in off position.
Should be appreciated that air valve assembly 102 can adopt various forms.Air valve assembly 102 can be aggressive valve or passive valve.Passive air valve is generally than aggressive valve low cost of manufacture.In one embodiment, filter of the present invention comprises passive air valve.Can use the passive air valve of number of different types.Fig. 4 shows the sectional view of an instance of passive valve 200.Passive valve 200 comprises the ground floor 202 and the second layer 206.Ground floor 202 has a plurality of diameters enough big hole 204 so that air can pass.Similarly, the second layer 206 has a plurality of diameters enough big hole 208 so that air can pass.In one embodiment, hole 208 diameters of the hole 204 of ground floor 202 and the second layer 206 are about 0.5mm at least.
The ground floor 202 of passive valve 200 can be processed by the material of distortion (or deflection) when it is applied power.When the air pressure on second side 212 of valve during greater than the air pressure on first side 214, passive valve can be taked open position.Specifically, when the air pressure on second side 212 of valve during greater than the air pressure on first side 214, ground floor 202 deflections are away from the second layer 206 and form the air flow path between the hole 204 of hole 208 and ground floor of the second layer.At this open position, air can flow along arrow 210 directions and pass passive valve.Ground floor 202 is by being formed for the hole that air passes and having enough flexibilities when being included as passive valve a part of, to take any material of open position to process.For example, the ground floor 202 of passive valve can be processed by the deformable polymer film.Through another instance, ground floor can comprise polyurethane, polypropylene, polyester or polytetrafluoroethylene (PTFE).In certain embodiments, the second layer 206 is poorer than the flexibility of ground floor 202.This may be implemented in a variety of ways.For example, the second layer 206 can be made into thicker than ground floor 202.Through another instance, can the processing of the second layer 206 by flexible material less than the material that is used to make ground floor 202.Equally, should be appreciated that in certain embodiments, the ground floor 202 and the second layer 206 fully deflection so that air-flow can flow along any direction (flow into or flow out shell) according to the direction of first side 214 of shell and the pressure reduction between second side 212.
Fig. 6 is the stereogram according to the filter 300 of the embodiment of the invention.In the figure, filter 300 is shown and has the top layer 304 that limits two top port 302.According to the structure of filter with respect to electronic shell, top port 302 can provide the fluid between filter interior and the electronic shell outside to be communicated with or they can provide the fluid between filter interior and the electronic shell inside to be communicated with.Be to be understood that in certain embodiments filter only comprises a top port.But filter also can comprise the top port 302 more than two.If top port is too little, they can undesirably stop flowing of air.
Fig. 7 is the vertical view of the filter of Fig. 6, comprises the situation of the inside and the bottom of filter 300.In the figure, bottom port 306 shown in broken lines.According to the structure of filter with respect to electronic shell, bottom port can provide the fluid between filter interior and the electronic shell outside to be communicated with or they can provide the fluid between filter interior and the electronic shell inside to be communicated with.Various embodiments of the present invention can comprise the bottom port more than.If bottom port is too little, it can undesirably stop flowing of air.Fig. 7 shows the filter element 308 of filter interior.The air that filter element 308 can be used in the filter removes pollutant.Filter element can be ring-type (or annular).But filter element also can be taked other shape.Filter element 308 can be included in the burlap alternatively.Filter element 308 can comprise that the air that passes breather filter 300 from flowing removes the medium of pollutant.The also removable alternate manner of filter element 308 diffuses into the pollutant of breather filter 300.In certain embodiments, filter element 308 material that can expand when having steam is processed.Through instance, filter element 308 can comprise activated carbon, silica gel, suction expandable polymer or its composition.In one embodiment, filter element 308 comprises super-absorbent polymer.Through instance, super-absorbent polymer can be from the AQUAKEEP SA60N Type II of Sumitomo Seika Chemical or from German Du Pont, the NAFION of Wilmington.
Fig. 8 is the cutaway view along the filter 300 of Fig. 6 of line B-B ' intercepting of Fig. 7.Top layer 304 is adjacent to filter element 308.Filter element is attached on the bottom 310.In structure shown in Figure 8, the inlet air flow path that filter element 308 stops up between top port 302 and the bottom port 306.Fig. 9 is the cutaway view along the filter of Fig. 6 of line B-B ' intercepting of Fig. 7, shows the path that when surpassing critical value across the pressure reduction of filter air passes filter.When the air pressure on first side 314 of filter during greater than the air pressure on second side 316 of filter, such as when shell heats up rapidly, top layer 304 deflections make and produce the gap between top layer 304 and the filter element 308.When this thing happens, the air flow path between top port 302 and the bottom port 306 was opened and air flows along the direction of arrow 312.Should be appreciated that or filter element 308 is attachable on the top layer 304 rather than on the bottom 310.
Under the situation that the material that filter element 308 expands when having water or steam is as stated processed, filter element 308 is used in and more effectively blocks the air flow path that passes filter 300 its period that is exposed to more steam.For example, again referring to the structure shown in Fig. 8, because filter element 308 can expand after being exposed to steam, it can contact top layer 304 and bottom 310 more tightly, and therefore forms sealing and more effectively block airflow better.The expansion of suction expandable polymer also can prevent steam and pass polymer diffusion itself owing to be called the phenomenon of glue obstruction.
Should be appreciated that filter of the present invention can be above electronic shell outside or inside paste the electronic shell upper vent hole.Through instance, referring to Figure 10, the filter that illustrates according to the embodiment of the invention is attached on the outer surface 322 of electronic shell 318.Be to be understood that filter can use any routine techniques, comprise and use binding agent and mechanical fixed part to be attached to electronic shell 318.Electronic shell 318 has passage 320.This filter is arranged so that bottom port 306 is installed in passage 320 tops of electronic shell.On the contrary, Figure 11 shows the cutaway view on the inner surface 324 that filter according to the embodiment of the invention is attached to electronic shell.In this embodiment, separation pad 326 provides the surface 324 of electronic shell 318 and the air gap between the top port 302.The air gap by separation pad 326 forms is enough big so that top layer 304 fully deflection pass the air flow path of filter with generation.Figure 12 shows the top perspective view of Figure 11 middle filtrator.In the figure, can find out that separation pad 326 is arranged on the top layer 304 of filter.
Existing referring to Figure 13, the cutaway view on the inner surface that according to another embodiment of the present invention filter 400 is attached to electronic shell 430 is shown.Should be appreciated that filter 400 can use any routine techniques, comprise that use binding agent and mechanical fixed part are attached.Figure 14 shows the enlarged drawing of a part 432 of the filter of Figure 13.Filter has the top layer 410 that limits top port 434.Filter has the valve layer 442 that comprises the ground floor 423 and the second layer 422.Ground floor 423 comprises a plurality of holes 402 (not in scale drawing) and flap part 420.Flap part 420 deflections are also removable.Similarly, the second layer 422 comprises a plurality of holes 403 (not in scale drawing) and flap part 418.
When valve layer 442 during in the closed position, ground floor 423 is arranged so that relative to each other that with the second layer 422 the flap part 418 of the second layer 422 covers the hole 402 of ground floors 423.Similarly, in the closed position, the flap part 420 of ground floor 423 covers the hole 403 of the second layer 422.Therefore, in this closed position, blocked air and passed flowing of valve layer 442.
The filter 400 that Figure 15 shows Figure 13 how to move so that the path of air can be from a side of electronic shell to electronic shell opposite side.Air pressure on the inside 436 of electronic shell is than the big critical quantity on the outside 438, and 420 deflections of ground floor flap are opened so that air can flow along arrow 426 directions and passed filter.How the filter 400 that Figure 16 shows Figure 13 moves so that the path of air can be from the outside of electronic shell to the inboard of electronic shell.Big critical quantity on the ratio of the air pressure on the outside 438 of electronic shell inboard 436,418 deflections of second layer flap are opened so that air can flow along arrow 428 directions and are passed filter.Therefore, the filter of Figure 13 can flow air before and after between the inboard 436 of electronic shell 430 and the outside 438, but only when existing when being enough to cause one of flap 418,420 deflection to the pressure reduction of open position just so.
Cause that flap 418,420 deflections can change according to the various factors such as the flexibility of the material that is used to make flap, the thickness of flap, the size of flap etc. to the necessary amount of differential pressure of open position.But the shape variable that is to be understood that flap changes into and makes that the necessary pressure reduction of opening them is the requirement of application-specific.The ground floor 423 and the second layer 422 of valve layer 442 can be by basically the polymer film of flow of liquid impermeable (under the situation that does not have hole 402,403) being processed.In certain embodiments, the ground floor 423 of valve layer 442 comprises barrier film with the second layer 422.
In certain embodiments, top port 434 is arranged on breather port top on the electronic shell 430, such as that kind shown in Figure 13.But structure is opposite in other embodiments, such as that kind shown in Figure 17, makes the top port 434 of filter at the opposition side of the filter of the breather port 440 of nearby electron shell 430.
Although not shown, be to be understood that the valve layer also can be made at ground floor flap and only porose at the second layer is only arranged.Such valve layer structure will provide the one-way passage of air.Similarly, the valve layer only can be made into is only having flap and only porose on ground floor on the second layer.
Filter medium
In certain embodiments, breather filter can comprise filter media on filter element or ground floor.Filter media can comprise certain filter medium and/or adsorbent filtering medium.Be used for particular filter media of the present invention and can have the effect on the very wide particle size scope that comprises the visible sizes of submicron to naked eyes (preferably more than or equal to 0.02 micron).The particulate filter media material that is fit to comprise little fiberglass media, efficient electret and such as but be not limited to the diaphragm material that expanded polytetrafluoroethyl, ne barrier film, polypropylene diaphragm, Merlon and polyester barrier film, cellulose mixed esters barrier film, polyvinyl chloride barrier film, cellulose triacetate barrier film and film are formed barrier film and/or its lamination.A kind of particular filter media that especially is fit to is expanded polytetrafluoroethyl, ne (PTFE of expansion or ePTFE), because it has good strainability, covers the adaptability and the spatter property of adsorption layer.The PTFE barrier film of preferable expansion has the gas-flow resistance of about 20mm water column with the face velocity of 10.5 feet of the per seconds filter efficiency to 0.1 micron diameter sized particles 99.99%.The PTFE that expands can be from W.L.Gore & Associates, and Inc buys GORE-TEX
.Millipore PVDF also can be used among some embodiment as particular filter media.
The adsorbing medium that uses in the certain embodiments of the invention can be selected from the adsorbent of wide region and suitable relevant specific gas.These gases comprise steam, dioctyl phthalate, silicones, chlorine, hydrogen sulfide, nitrogen dioxide, mineral acid gas, hydrocarbon compounds and any oxidable or cause any critical elements corrosion or condensable on the critical elements to influence any other gas of their operations.Selected adsorbing medium can be the combination of the different medium type of single type.It can be maybe can be that gas to wide range has a kind of of good adsorption properties to the concrete adsorbent of selecting of specific gas.
The adsorbing medium that uses in the various embodiments of the present invention can comprise physical absorbent, such as but be not limited to silica gel, activated carbon, activated aluminum, molecular sieve or such as the drier of clay; Perhaps chemosorbent, such as but be not limited to calcium carbonate, calcium sulfate, potassium permanganate, sodium carbonate, potash, sodium phosphate, powdery or reactive metal or other reactant that is used for chemical reaction and purifies gas phase corrosion material or pollutant.
If use the combination of adsorbent, they can be arranged on the individual layer of top of each other, or are fixed on one deck.Perhaps, adsorbing medium can be the medium that injects one or more additional adsorbents, and additional adsorbent injects but is not limited to activated carbon, silica gel or injects the aluminium oxide of one or more chemosorbents as stated.Preferable wide region adsorbent is the activated carbon with wide in range pore size distribution that injects one or more chemosorbents such as calcium carbonate or sodium carbonate.In order to make the physical absorbent of broad based, wide in range pore size distribution can be used to provide the gas that absorbs wide region.The injection that carbonate is normally good is selected, because because the d/d compound of chemical reaction of chemosorbent is carbon dioxide, oxygen, He Shui.Preferable adsorbent for given pollutant depends on that the hole size of pollutant, physical absorbent and selection are used for optimizing the chemical composition to the chemosorbent of specific pollutants performance.
Adsorbent medium can include, but are not limited to one or more in the following structure: 100% sorbing material, such as granulated sorbent, carbonization is woven or non-woven material; The non-woven material such as the dipping adsorbent of cellulose or polymer non-woven fleece that can comprise latex, acrylic acid or some other bonding systems; Can comprise polymer or pottery porous casting adsorbent with the loose structure that keeps them; Be used as the polymer or the membrane for polymer of the injection adsorbent of porous workbench, wherein the space in the workbench is filled with adsorbent.The PTFE barrier film that the polymer workbench includes but not limited to expand, polypropylene diaphragm, polyethylene barrier film, polypropylene diaphragm, polyethylene barrier film, polyvinylidene fluoride barrier film, polyvinyl alcohol barrier film, polyethylene terephthalate barrier film and
Shape BecomeCan be made into the barrier film of any other polymer with node and fubril structure.Sorbent material can be the mixture of a type or any amount physical absorbent and/or chemosorbent fully.
In certain embodiments, adsorbing medium can comprise the inflatable composition of water.In one embodiment, adsorbing medium can comprise the water swellable absorbent.The water swellable absorbent also is called the hypersorption polymer.The water swellable absorbent can comprise anionic polymer, such as gather (acrylic acid), gather (methacrylic acid), isobutene-copolymer-maleic anhydride, gather (vinylacetic acid), gather (vinyl phosphonate), gather (vinyl sulfonic acid), carboxymethyl cellulose, CMS, intersection dish glue, alginic acid, poly-aspartate, polyglutamic acid and its composition and EVA
Alkali metal with
Ammonium saltCationic polymer; Such as gathering (vinylamine), gather (aziridine), gather (aminopropanol vinethene), gathering (allylamine); Gather (quaternary amine), gather (hydroxide two propylene Dimethyl Ammonium), poly-asparagine (polyasparagins), polyglutamic acid amides, polylysin, gather smart ammonia amine; With the salt of its composition and EVA, above-mentioned anion and cationic polymer.In one embodiment, the water swellable absorbent comprises one of sodium polyacrylate, polyethylene ammonium salt, polyacrylic acid, polyvinylamine and composition and growth.In one embodiment, the water swellable absorbent comprises the AQUAKEEP SA60N that can buy from Sumitomo Seika Chemicals.In another embodiment, the water swellable absorbent can comprise can be from German Du Pont, the NAFION that Wilmington buys.
Although described the present invention with reference to several specific embodiments, the technical staff in present technique field will appreciate that and can carry out multiple variation and without departing from the spirit and scope of the present invention to it.
Claims (9)
1. breather filter assembly comprises:
Valve, said valve comprises:
Top layer limits first hole;
Bottom limits second hole; And
Filter element is arranged between said top layer and the bottom, and said filter element comprises filter medium,
Said filter element be attached on the one deck in said top layer and the bottom and stop up said top layer and said bottom between inlet air flow path; And
Said top layer only be configured to when the air pressure on said filter assemblies first side during greater than the air pressure on filter assemblies second side deflection between said top layer and said filter element, to form the air gap.
2. breather filter assembly as claimed in claim 1 is characterized in that said valve comprises passive valve.
3. breather filter assembly as claimed in claim 1 is characterized in that, said filter medium absorbs steam.
4. breather filter assembly as claimed in claim 1 is characterized in that, said filter medium comprises the inflatable absorbing polymeric of water.
5. breather filter assembly as claimed in claim 1 is characterized in that, said top layer and said bottom comprise impermeable basically polymer film.
6. breather filter assembly as claimed in claim 1 is characterized in that said top layer limits a plurality of holes.
7. breather filter assembly as claimed in claim 1 is characterized in that said bottom limits a plurality of holes.
8. breather filter assembly as claimed in claim 1 is characterized in that said filter element is annular.
9. breather filter assembly as claimed in claim 1 is characterized in that said top layer comprises perimeter edge, and said bottom comprises the perimeter edge on the perimeter edge that is attached to said top layer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64971105P | 2005-02-03 | 2005-02-03 | |
| US60/649,711 | 2005-02-03 | ||
| PCT/US2006/003803 WO2006084106A1 (en) | 2005-02-03 | 2006-02-03 | Breather filter for reduction of contaminant diffusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101137426A CN101137426A (en) | 2008-03-05 |
| CN101137426B true CN101137426B (en) | 2012-02-22 |
Family
ID=36777578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800073190A Expired - Fee Related CN101137426B (en) | 2005-02-03 | 2006-02-03 | Breather filter for reduction of contaminant diffusion |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2008528286A (en) |
| CN (1) | CN101137426B (en) |
| WO (1) | WO2006084106A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007095335A2 (en) | 2006-02-13 | 2007-08-23 | Donaldson Company, Inc. | Filter web comprising fine fiber and reactive, adsorptive or absorptive particulate |
| US7988860B2 (en) | 2007-03-15 | 2011-08-02 | Donaldson Company Inc. | Superabsorbent-containing web that can act as a filter, absorbent, reactive layer or fuel fuse |
| US8885291B2 (en) | 2012-08-10 | 2014-11-11 | Donaldson Company, Inc. | Recirculation filter for an electronic enclosure |
| US10010822B2 (en) | 2012-08-10 | 2018-07-03 | Donaldson Company, Inc. | Recirculation filter for an electronic enclosure |
| US9114349B2 (en) | 2012-10-26 | 2015-08-25 | Donaldson Company, Inc. | Controlled moisture vapor transmission filter assembly for electronic enclosures |
| WO2015123406A1 (en) | 2014-02-13 | 2015-08-20 | Donaldson Company, Inc. | Recirculation filter for an enclosure |
| DE102020108055A1 (en) * | 2020-03-24 | 2021-09-30 | Mann+Hummel Gmbh | Particle discharge device, filter assembly and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5417743A (en) * | 1994-01-21 | 1995-05-23 | W. L. Gore & Associates, Inc. | Self-adhesive vent filter and adsorbent assembly with a diffusion tube |
| US5997614A (en) * | 1998-07-13 | 1999-12-07 | Donaldson Company, Inc. | Filter with diffusion channel and methods of making and using the filter |
| US6296691B1 (en) * | 1999-09-21 | 2001-10-02 | Gore Enterprise Holdings, Inc. | Multi-functional molded filter for removing contaminants from an enclosure |
| US6395073B1 (en) * | 1999-08-23 | 2002-05-28 | Gore Enterprise Holdings, Inc. | Multi-functional filter for removing contaminants from an enclosure |
| US6683746B1 (en) * | 1999-02-10 | 2004-01-27 | Hitachi Global Storage Technologies Netherlands B.V. | Disk drive breather filter with adsorbent layer shorter than receiving sheet aperture |
-
2006
- 2006-02-03 CN CN2006800073190A patent/CN101137426B/en not_active Expired - Fee Related
- 2006-02-03 WO PCT/US2006/003803 patent/WO2006084106A1/en active Application Filing
- 2006-02-03 JP JP2007554232A patent/JP2008528286A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5417743A (en) * | 1994-01-21 | 1995-05-23 | W. L. Gore & Associates, Inc. | Self-adhesive vent filter and adsorbent assembly with a diffusion tube |
| US5997614A (en) * | 1998-07-13 | 1999-12-07 | Donaldson Company, Inc. | Filter with diffusion channel and methods of making and using the filter |
| US6683746B1 (en) * | 1999-02-10 | 2004-01-27 | Hitachi Global Storage Technologies Netherlands B.V. | Disk drive breather filter with adsorbent layer shorter than receiving sheet aperture |
| US6395073B1 (en) * | 1999-08-23 | 2002-05-28 | Gore Enterprise Holdings, Inc. | Multi-functional filter for removing contaminants from an enclosure |
| US6296691B1 (en) * | 1999-09-21 | 2001-10-02 | Gore Enterprise Holdings, Inc. | Multi-functional molded filter for removing contaminants from an enclosure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008528286A (en) | 2008-07-31 |
| WO2006084106A1 (en) | 2006-08-10 |
| CN101137426A (en) | 2008-03-05 |
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Granted publication date: 20120222 Termination date: 20160203 |