WO2010101093A1 - 通気フィルター及びこれを用いた電気装置 - Google Patents
通気フィルター及びこれを用いた電気装置 Download PDFInfo
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- WO2010101093A1 WO2010101093A1 PCT/JP2010/053130 JP2010053130W WO2010101093A1 WO 2010101093 A1 WO2010101093 A1 WO 2010101093A1 JP 2010053130 W JP2010053130 W JP 2010053130W WO 2010101093 A1 WO2010101093 A1 WO 2010101093A1
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- ventilation
- ventilation filter
- flow path
- filter according
- gas
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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
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
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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
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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
- B01D53/22—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 diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/08—Flat membrane modules
- B01D63/087—Single membrane modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/082—Grilles, registers or guards
- F24F13/085—Grilles, registers or guards including an air filter
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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
- G11B33/1486—Control/regulation of the pressure, e.g. the pressure inside the housing of a drive
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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
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
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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
- B01D2253/20—Organic adsorbents
- B01D2253/206—Ion exchange resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/35—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for venting arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/45—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for electronic devices, e.g. computers, hard-discs, mobile phones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/40—Adsorbents within the flow path
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the present invention relates to a ventilation filter and an electric device using the ventilation filter. More specifically, the present invention relates to a ventilation filter that is used by being attached to a casing ventilation hole in an electric device such as a hard disk drive.
- Ventilation holes for relieving air pressure (internal pressure) inside the casing (container) are provided in the casing of the electronic device and the container for storing or transporting chemical substances such as chemicals.
- the ventilation hole is provided with a ventilation filter for blocking contaminants such as dust and water droplets that may enter from the outside.
- a ventilation filter for a hard disk drive (HDD) is known.
- the ventilation filter is required to have a function of preventing contaminants existing outside the housing from entering the inside of the housing, and in particular, an HDD requires a very high air cleanliness. For this reason, it is necessary to suppress dust generation and gas generation from the ventilation filter itself.
- Patent Document 1 describes a filter assembly including a plastic housing that encloses a gas passage and a filter sheet (a ventilation film) that can adsorb gaseous contaminants.
- the gas passage in the plastic housing allows gas to flow between the breather opening (vent) and the gas permeable membrane.
- Patent Document 2 discloses a ventilation filter composed of a laminated structure of a double-sided pressure-sensitive adhesive tape, a gas adsorbent, and a gas permeable membrane.
- Patent Document 1 discloses that a diffusion channel (gas passage) is included. It has the same function as the ventilation filter.
- Patent Document 2 an example of using a porous PTFE membrane is given as an air-permeable material.
- PTFE is the material that generates the least amount of dust and gas among plastics because it has high heat resistance and does not melt even at high temperatures.
- JP 7-2111055 A (FIG. 2 etc.) Japanese Patent No. 3313725 (FIG. 2A, etc.)
- the diffusion channel is formed by punching an opening shape in a thin double-sided adhesive tape, the diffusion channel may be lengthened or complicated. Have difficulty. Moreover, since the cross-sectional area of the diffusion channel is limited by the thickness of the double-sided pressure-sensitive adhesive tape to be used, the gas flow rate cannot be taken sufficiently. That is, the structure of the ventilation filter described in Patent Document 2 has problems that the diffusion efficiency of the flowing gas is poor and the pressure loss is high.
- the present invention has been made under the circumstances as described above, and reduces the contaminants emitted from the ventilation filter to the inside of the housing and the like, and provides a high diffusion efficiency and low pressure loss ventilation filter. It is intended to provide.
- the ventilation filter of the present invention that can achieve the above-mentioned object is provided with an adhesive layer having a through hole at least at one place, a flow path member provided with a flow path communicating with the through hole, and covering the flow path member, A gas permeable filter that also covers a part of the adhesive layer, wherein a peripheral portion of the gas permeable film is fixed to the adhesive layer, and the flow path member is formed between the adhesive layer and the gas permeable film. Is held in the hollow portion.
- the flow path member is a plastic formed product.
- a groove is formed on the first main surface of the flow path member facing the adhesive layer, and the groove is used as a flow path of the flow path member.
- the ventilation filter it is desirable to form a gas adsorbing member between the flow path member and the gas permeable membrane.
- a recess and / or a protrusion is formed on the second main surface of the flow path member facing the gas adsorbing member.
- a concave portion and / or a convex portion be formed on the first main surface of the gas adsorbing member facing the flow path member.
- a ventilation member is sandwiched between the gas adsorbing member and the flow path member. Furthermore, it is desirable that the peripheral portion of the ventilation member is sandwiched between the gas permeable membrane and the adhesive layer at the peripheral portion of the gas permeable membrane.
- a barrier layer is formed between the gas adsorbing member and the ventilation film.
- another gas adsorbing member is further formed between the barrier layer and the ventilation film.
- an engaging portion is formed on the flow path member and / or the gas adsorbing member.
- the ventilation film is made of a fluororesin film, more preferably an expanded porous polytetrafluoroethylene film.
- the ventilation filter it is desirable to add a liquid repellent to the surface of the ventilation film.
- the adhesive layer can be composed of a double-sided adhesive tape.
- a bonding area between the peripheral portion of the ventilation film and the adhesive layer is 0.15 times or more and 0.8 times or less of a bottom area of the ventilation filter.
- the thickness of the flow path member is preferably 0.3 mm to 5 mm.
- a space is formed between the flow path member and the gas adsorbing member, and the volume of the space is 0.02 mm 3 or more per 1 mm 2 area of the main surface of the flow path member.
- the electrical device of the present invention that has achieved the above object has a casing having an opening and the ventilation filter formed so as to cover the opening.
- the flow path member is held in the hollow portion formed between the adhesive layer and the ventilation film, contaminants originating from the flow path member are emitted from the ventilation filter. There is no.
- the shape and material of the flow path member since there are no particular restrictions on the shape and material of the flow path member, there is a high degree of freedom in designing the flow path, and it is possible to construct a high diffusion efficiency ventilation filter. Depending on the design, ventilation with both high diffusion efficiency and low pressure loss.
- a filter can also be configured.
- the peripheral portion of the gas permeable membrane where the adhesive layer and the gas permeable membrane are fixed holds the flow path member, including the strength of the adhesive layer. Since it is thinner and more flexible than the existing part, it has good adhesion to the housing fitted with a ventilation filter. Therefore, even if some swell or deformation occurs in the housing, the collar portion is deformed along the housing, so that the gas hardly leaks.
- FIG. 1 is an upper perspective view of a ventilation filter according to Embodiment 1 of the present invention.
- FIG. 2 is a sectional view of the ventilation filter.
- FIG. 3 is a lower perspective view of the ventilation filter.
- FIG. 4 is a cross-sectional view of the ventilation filter according to Embodiment 1 of the present invention.
- FIG. 5 is a cross-sectional view of a ventilation filter according to Embodiment 2 of the present invention.
- FIG. 6 is a cross-sectional view of a ventilation filter according to Embodiment 3 of the present invention.
- FIG. 7 is a cross-sectional view of a ventilation filter according to Embodiment 4 of the present invention.
- FIG. 8 is a cross-sectional view of a ventilation filter according to Embodiment 5 of the present invention.
- FIG. 9 is a cross-sectional view of a ventilation filter according to Embodiment 6 of the present invention.
- FIG. 10 is a cross-sectional view of a ventilation filter according to Embodiment 7 of the present invention.
- FIG. 11 is a cross-sectional view of another ventilation filter according to Embodiment 7 of the present invention.
- FIG. 12 is a cross-sectional view of a ventilation filter of a reference example.
- a hard disk drive (HDD) is used as an example of the electric device.
- FIGS. 1 to 3 are diagrams illustrating the structure of a ventilation filter according to an embodiment of the present invention. More specifically, FIG. 1 is an upper perspective view of the ventilation filter according to the present embodiment, FIG. 2 is a sectional view, and FIG. 3 is a lower perspective view.
- the ventilation filter includes an adhesive layer 1 having a through hole 1a at at least one location, a flow path member 2 including a flow path 2a communicating with the through hole 1a, and a flow path member 2 And a gas permeable membrane 3 that covers a part of the adhesive layer 1. A peripheral edge (ridge part) 3 a of the gas permeable membrane 3 is fixed to the adhesive layer 1.
- the flow channel member 2 is held in a hollow portion formed between the adhesive layer 1 and the gas permeable membrane 3, and a gas adsorbing member 4 is formed between the flow channel member 2 and the gas permeable membrane 3. .
- FIG. 4 is a cross-sectional view showing a state where the ventilation filter shown in FIGS. 1 to 3 is attached to the inner wall of the housing 5 of the HDD.
- the housing 5 is provided with an opening 5a.
- the presence of the opening 5a allows the opening 5a and the ventilation filter (the through hole 1a, the flow path 2a in the flow path member 2 and the opening 2b) to pass through even if the air inside the housing 5 expands and contracts. It has a structure that allows air to enter and exit through the casing. For this reason, breathing of the HDD housing 5 is realized while keeping the inside of the HDD housing 5 highly clean.
- the HDD housing 5 is supplied with air from which contaminants have been removed by a ventilation filter.
- the inside is kept highly clean without deformation.
- the flow path member 2 prevents moisture from entering the HDD housing 5 to prevent condensation inside the HDD and to prevent rusting. .
- the gas that has entered from the outside of the housing 5 (the lower side in FIG. 4) via the opening 5 a of the housing 5 flows into the ventilation filter from the through hole 1 a of the adhesive layer 1, It flows through 2a to the opening 2b. From the opening 2b, it passes through the gas adsorbing member 4 and the gas permeable membrane 3 to the inside of the housing 5 (upper side in FIG. 1). The gas can also flow in the opposite direction, and escapes from the opening 5a of the housing 5 to the outside through the flow passage 2a from the gas permeable membrane 3 side.
- the ventilation filter in the present embodiment collects dust generated from the flow path member 2 in order to hold (seal) the flow path member 2 in a hollow portion formed between the adhesive layer 1 and the ventilation film 3. And high-purity gas filtration (filtering) can be performed. Moreover, since there is no restriction
- the flange 3a since the flange 3a includes the strength of the adhesive layer 1 and is thinner and more flexible than the portion holding the flow path member 2, the adhesion between the ventilation filter and the housing 5 in the flange 3a. Is good. That is, even if the housing 5 is deformed due to some external stress applied to the housing 5, the collar portion 3 a follows the deformation of the housing, so that the collar portion 3 a is not easily lifted from the housing 5 and is not easily peeled off. Therefore, it is possible to effectively prevent the gas from flowing into and out of the housing 5 without passing through the gas permeable membrane 3.
- the ventilation filter of the present invention has the adhesive layer 1, the flow path member 2, and the ventilation film 3 as necessary components, but the gas adsorption member 4 needs to adsorb and remove harmful gases. Depending on the case, it is provided.
- the detail of the structural member in this Embodiment is demonstrated.
- the adhesive layer 1 is a sheet-like material having adhesiveness, and is formed, for example, by forming an adhesive on a base material sheet having flexibility.
- the adhesive refers to general substances used for bonding objects to each other, and includes what is called an adhesive.
- the adhesive adhesive
- conventionally known ones such as acrylic adhesives, silicone adhesives, and rubber adhesives can be used as appropriate.
- the acrylic adhesive is excellent in heat resistance and low gas generation. It is preferably used.
- the heat-resistant temperature of the adhesive is, for example, 80 ° C. or higher, preferably 120 ° C. or higher. If the heat-resistant temperature is less than 80 ° C., the flow path member 2 or the gas permeable membrane 3 may be peeled off due to the heat load during use.
- the channel member 2 is a member having the channel 2a for diffusing gas as described above.
- the material of the flow path member 2 is preferably a material that generates little gas and has low gas and moisture permeability, but may be appropriately selected according to the intended use and purpose.
- a plastic forming method for example, an appropriate one can be selected from methods such as injection molding, cast molding, compression molding, and cutting.
- the thickness of the flow path member 2 may be set as appropriate depending on the required air permeability and diffusion resistance. However, if the thickness is too thin, the air resistance increases, and if too thick, the assembly processability and cost are affected. It is preferably 3 mm to 5 mm.
- the flow path 2a may be a hole provided in the flow path member 2 or may be a passage (that is, a groove) exposed on the surface of the flow path member 2.
- a groove is formed on the first main surface of the flow path member 2 facing the adhesive layer 1 and a flow path space is formed between the flow path member 2 and the adhesive layer 1, the groove is formed in the flow path member 2.
- the shape of the flow path 2a can be linear, curved, spiral, spiral, or other forms.
- the length of the flow path 2a is desirably 5 mm or more (preferably 10 mm or more) in order to increase the diffusion efficiency, and the total volume of the flow path 2a is, for example, 0.45 mm in order to reduce the pressure loss of the ventilation filter.
- 3 or more (preferably 0.9 mm 3 or more) is preferably a.
- Air-permeable membrane 3 is a membrane-like material having air permeability, and is desirably provided with air-permeability, collection efficiency and cleanliness suitable for the use environment.
- a porous resin film, an electret nonwoven fabric, a nanofiber nonwoven fabric, or the like can be used.
- Polyethylene, polypropylene, polystyrene, polyimide, or the like can be used as the material of the gas permeable membrane 3.
- a fluororesin excellent in waterproofness more preferably a porous polytetrafluoroethylene (PTFE) film is used. Recommended to use.
- the use of a thin film obtained by laminating a porous PTFE film and another breathable material is preferable from the viewpoint of reinforcement.
- a microscopic shape of the gas permeable membrane 3 a net shape, a mesh shape, or a porous shape can be used.
- the porous PTFE film is excellent in waterproofness, and is suitable for the purpose of providing air permeability inside and outside the HDD while preventing intrusion of water droplets, dust, harmful gas, and the like.
- An expanded porous PTFE film can be used as the porous PTFE film.
- the stretched porous PTFE film is obtained by removing the molding aid from the molded paste obtained by mixing PTFE fine powder with the molding aid, then stretching at a high temperature and high speed, and further firing if necessary. Is obtained.
- the nodes folded crystals
- the fibrils straight-lined drawn by unfolding the folded crystals by stretching to connect the nodes
- Molecular bundle is oriented in the stretching direction. And it has a fibrous structure in which spaces defined between fibrils or between fibrils and nodes become holes.
- biaxial stretching the fibrils spread radially, the nodes connecting the fibrils are scattered in islands, and a cobweb-like fibrous structure in which many spaces defined by the fibrils and the nodes exist. ing.
- the permeable membrane 3 may be a uniaxially stretched porous PTFE film or a biaxially stretched porous PTFE film.
- the gas permeable membrane 3 is preferably used by coating the inner surface of the pores with a liquid repellent polymer.
- a liquid repellent polymer By coating the inner surface of the pores of the gas permeable membrane 3 with a water- and oil-repellent polymer, various contaminants such as body fat, machine oil, and water droplets penetrate or are retained in the pores of the gas-permeable membrane. Can be suppressed. These contaminants reduce the trapping characteristics and ventilation characteristics of the gas permeable membrane and cause the function of the gas permeable membrane to be impaired.
- liquid repellent refers to a substance that has a property or function of repelling liquid
- liquid repellent includes “water repellent”, “water repellent”. It includes “oil agent”, “water / oil repellent” and the like.
- oil repellent includes “oil agent”, “water / oil repellent” and the like.
- water / oil repellent polymer a polymer having a fluorine-containing side chain can be used.
- the details of the water / oil repellent polymer and the method of combining it with a porous PTFE film are disclosed in WO94 / 22928 and the like, and an example thereof is shown below.
- the water / oil repellent polymer the following general formula (1)
- an aqueous microemulsion of this polymer (average particle size 0.01 to 0.5 ⁇ m) is added to a fluorine-containing surfactant (eg ammonium perfluoro).
- Octanate is used to impregnate the pores of the porous PTFE film and then heated. This heating removes water and the fluorine-containing surfactant, and the polymer having fluorine-containing side chains melts to coat the inner surface of the pores of the porous PTFE film while maintaining the continuous pores. A breathable membrane excellent in water and oil repellency can be obtained.
- the shape of the gas permeable membrane 3 has been described as a circular shape.
- the shape of the gas permeable membrane 3 is not limited to a circular shape, and various shapes may be used depending on the shape of the flow path member 2 or the gas adsorbing member 4.
- the bonding area between the peripheral edge of the gas permeable membrane 3 and the adhesive layer 1 (the area of the flange 3a), but in order to prevent gas leakage, it is 0.15 times or more (preferably, the bottom area of the gas permeable filter). (0.3 times or more) is desirable.
- the area of the flange 3a should be 0.8 times or less (preferably 0.6 times or less) the bottom area of the ventilation filter. desirable.
- the gas adsorbing member 4 is not an essential component of the present invention, but is provided depending on the necessity to adsorb and remove harmful gases.
- the gas adsorbent used for the gas adsorbing member 4 activated carbon, silica gel, ion exchange resin or the like is used. Activated carbon is suitable for organic gas adsorption. When an alkali component or an acid component is added to the activated carbon, the adsorption characteristics of the inorganic gas can be added, so that it is preferably used as appropriate.
- the shape of the gas adsorbing member 4 a sheet shape or a tablet shape is preferably used from the viewpoint of workability and handling properties. However, when the bottom surface and the upper surface of the flow path member 2 are formed small, gas adsorbing is used.
- the member 4 is also made thick in order to make the bottom surface small and to secure the ability to adsorb and remove harmful gases accordingly.
- the ventilation filter of the present invention may exhibit advantageous effects in the manufacturing process of attaching to the casing of the electronic device.
- the flow path member 2 is held in the hollow portion formed between the adhesive layer 1 and the gas permeable membrane 3, so that the portion between the adhesive layer 1 and the gas permeable membrane 3 is in the flange portion 3 a. Therefore, even if a strong pressure is applied to the flange portion 3a when the ventilation filter is attached to the housing 5, no pressure is transmitted to the flow channel member 2. Is not damaged, and does not cause an air flow failure due to the deformation of the flow path 2a.
- FIG. 5 is a cross-sectional view of a ventilation filter according to Embodiment 2 of the present invention.
- the second main surface of the flow channel member 2 facing the gas adsorbing member 4 (the side opposite to the first main surface facing the adhesive layer 1). ) Is provided with a recess and / or a protrusion so that a ventilation gap is provided between the flow path member 2 and the gas adsorbing member 4. This is effective for preventing the pressure loss of the ventilation filter from increasing when the gas adsorbing member 4 has low air permeability.
- FIG. 6 is a cross-sectional view of a ventilation filter according to Embodiment 3 of the present invention.
- the first main surface facing the flow path member 2 on the side opposite to the second main surface facing the gas permeable membrane 3) and / or
- the air gap is provided between the flow path member 2 and the gas adsorbing member 4 as in the second embodiment.
- it is effective when the gas adsorbing member 4 has low air permeability.
- the space formed between the flow path member 2 and the gas adsorbing member 4 is 0.02 mm 3 or more (preferably 0.1 mm 3 or more preferably) per 1 mm 2 of the gas adsorbing member 4 in order to effectively exhibit such an effect. ) Is desirable. It is desirable to use compression molding for forming the irregularities of the gas adsorbing member 4.
- FIG. 7 is a cross-sectional view of a ventilation filter according to Embodiment 4 of the present invention.
- the ventilation member 6 is sandwiched between the flow path member 2 and the gas adsorption member 4.
- the ventilation member 6 is a material that can secure a gap for ventilation, and preferably a nonwoven fabric or a net material can be used. At this time, if a material having filtration characteristics is used as the material constituting the ventilation member 6, when there is much dust generation from the gas adsorbing member 4, the dust moves to the flow path 2a and clogs the flow path 2a. It can be prevented from flowing out of the ventilation filter.
- a porous resin film, an electret nonwoven fabric, a nanofiber nonwoven fabric, or the like can be used as a specific material having filtration characteristics.
- the ventilation filter according to the fourth embodiment of the present invention is also effective when the gas adsorbing member 4 has low air permeability as in the second or third embodiment, but compared to the second or third embodiment, In addition to omitting the step of forming irregularities on the flow path member 2 and the gas adsorbing member 4, there is an advantage that dust can be collected before reaching the gas permeable membrane 3.
- FIG. 8 is a cross-sectional view of a ventilation filter according to Embodiment 5 of the present invention.
- the ventilation filter according to the fifth embodiment has basically the same configuration as the ventilation filter according to the fourth embodiment, but the ventilation member 6 is formed wider, and the peripheral portion of the ventilation member 6 Is sandwiched between the gas permeable membrane 3 and the adhesive layer 1 at the peripheral edge portion (the flange portion 3 a) of the gas permeable membrane 3. With such a structure, the ventilation member 6 can be stably fixed.
- the gas flow is possible even in the portion where the ventilation member 6 is in contact with the flange portion 3a due to the gas flow in the in-plane direction of the ventilation member 6, the pressure loss of the ventilation filter can be kept low. Since the gas permeable membrane 3 needs to have a certain strength, it is effective when the air permeability of the gas permeable membrane 3 cannot be increased.
- FIG. 9 is a cross-sectional view of a ventilation filter according to Embodiment 6 of the present invention.
- a barrier layer 7 that cannot transmit gas is formed between the gas adsorbing member 4 and the gas permeable membrane 3.
- the gas flowing into the ventilation filter from the through hole 1a tries to reach the ventilation film 3 through the path where the ventilation resistance is the lowest.
- the gas passes through the gas permeable membrane 3 into the housing 5.
- the barrier layer 7 is effective when the gas is to cross the gas adsorbing member 4 through the longest path possible.
- the opening 2 b of the flow path member 2 is disposed at the center of the gas adsorption member 4. This is because the gas containing harmful gas permeates through the gas adsorbing member 4 over a distance of at least half the width of the gas adsorbing member 4.
- this ventilation filter it is desirable to form another gas adsorbing member between the barrier layer 7 and the ventilation film 3.
- the barrier layer 7 in FIG. 9 is provided, the adsorption performance for the gas existing inside the housing 5 (upper side in FIG. 9) is lowered, so that the gas adsorption member 4 and two layers of another gas adsorption member are formed. More preferably, the barrier layer 7 is sandwiched between the gas adsorbing members.
- FIG. 10 is a cross-sectional view of a ventilation filter according to Embodiment 7 of the present invention, and shows an example in which a convex portion is provided in the flow path member 2 and a concave portion is provided in the gas adsorbing member 4.
- the shape of the convex portion can take various forms such as a columnar shape, a conical shape, and a trapezoidal shape.
- FIG. 11 is a cross-sectional view of another ventilation filter according to Embodiment 7 of the present invention, and is an example in which the gas adsorbing member 4 is formed with a recess that can accommodate the entire flow path member 2. .
- the flow path member 2 and the gas adsorbing member 4 can be engaged with each other to prevent the relative displacement between the flow path member 2 and the gas adsorbing member 4. be able to.
- the present invention is not limited to an HDD, and it is necessary to have a housing (container) to reduce fluctuations in atmospheric pressure (internal pressure) inside the housing. It can be used for any housing that has it. For example, it can be used in various control boxes with a built-in computer, a chemical storage container or a transport container.
- FIG. 12 is a cross-sectional view of a ventilation filter shown as a reference example.
- This ventilation filter has a structure in which a gas adsorbing member in which a gas adsorbent is sealed in an expanded porous PTFE membrane formed in a container shape and a plastic molded body 8 having a diffusion channel are combined by welding.
- This ventilation filter has a smaller amount of plastic used and an exposed area of the plastic than the ventilation filter disclosed in Patent Document 1, but the side surface of the flow path member is exposed on the surface of the ventilation filter.
- burrs, cutting waste, release agents, and the like are scattered in the housing.
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Abstract
Description
図1~3は、本発明の実施の形態に係る通気フィルターの構造を解説する図である。より詳しくは、図1は本実施の形態に係る通気フィルターの上側斜視図であり、図2は断面図であり、図3は下側斜視図である。図1~3に示されるように、通気フィルターは、少なくとも1箇所に貫通孔1aを有する接着層1と、貫通孔1aに連通する流路2aを備えた流路部材2と、流路部材2を覆い、かつ接着層1の一部も覆う通気膜3とを有する。通気膜3の周縁部(鍔部)3aが接着層1に固定されている。流路部材2は、接着層1と通気膜3との間に形成される中空部内に保持されており、流路部材2と通気膜3との間には気体吸着部材4が形成されている。
接着層1は、接着性を有するシート状物であり、例えば、可撓性を有する基材シートに接着剤を形成してなるものである。本発明において、接着剤とは、物と物を貼り合わせるのに用いる物質一般を指すものであり、粘着剤と呼ばれるものを含むものとする。接着剤(粘着剤)としては、アクリル系接着剤、シリコーン系接着剤、ゴム系接着剤等、従来公知のものが適宜使用できるが、アクリル系接着剤が耐熱性や低発ガス性に優れており好ましく用いられる。接着剤の耐熱温度(被着体に対して接着性を保持できる温度)は、例えば、80℃以上、好ましくは120℃以上である。耐熱温度が80℃未満では、使用時の熱負荷によって流路部材2または通気膜3が剥れてしまう場合がある。
流路部材2は、上述の通り、気体を拡散させるための流路2aを有する部材である。流路部材2の材料としては、発ガスが少なく、ガスや水分の浸透性が小さいものが良いが、使用用途や目的に応じて適宜選定すればよい。好ましくはポリカーボネート、ポリプロピレン、ポリエステル、ナイロン、アクリルポリマー、ポリアセタール、液晶ポリマー、ABS樹脂、ポリスチレン、ポリフェニレンサルファイド、ポリエーテルエーテルケトン、ポリウレタン、エポキシ樹脂、不飽和ポリエステル樹脂、合成ゴム、熱可塑性エラストマー、特に好ましくは熱可塑性プラスチックである。プラスチックの形成方法は、例えば、射出成型、注型成型、圧縮成型、切削加工等の方法から適切なものを選択し得る。中でも射出成型は、加工精度や量産性に優れるため最も好ましい。流路部材2の厚みは必要とされる通気性や拡散抵抗によって適宜設定すればよいが、厚みが薄すぎると通気抵抗が高くなり、厚すぎると組み立て加工性やコストに影響が出るので、0.3mm~5mmとすることが好ましい。
通気膜3は、通気性を有する膜状物であり、使用環境に適合した通気性と捕集効率とクリーン性を備えたものであることが望ましい。通気膜3には、多孔質樹脂フィルムやエレクトレット不織布やナノファイバー不織布等を用いることができる。通気膜3の材料としては、ポリエチレン、ポリプロピレン、ポリスチレン、ポリイミド等を使用することができるが、好ましくは防水性に優れたフッ素樹脂、更に好ましくは、多孔質ポリテトラフルオロエチレン(PTFE)のフィルムを用いることが推奨される。多孔質PTFEフィルムと他の通気性素材をラミネートした薄膜を用いることは、補強の観点で好ましい。通気膜3の微視的形状としては、ネット状、メッシュ状、多孔質のものを用いることができる。多孔質PTFEフィルムは、防水性に優れ、水滴、塵埃、有害ガス等の侵入を防止しつつHDDの内外の通気性を持たせる用途に適している。
撥水撥油性ポリマーとしては、下記一般式(1)
で表されるフルオロアルキルアクリレートおよび/またはフルオロアルキルメタクリレートを重合して得られる含フッ素側鎖を有するポリマー(フッ素化アルキル部分は4~16の炭素原子を有することが好ましい)を好ましく用いることができる。このポリマーを用いて上記多孔質PTFEフィルムの細孔内を被覆するには、このポリマーの水性マイクロエマルジョン(平均粒径0.01~0.5μm)を含フッ素界面活性剤(例、アンモニウムパーフルオロオクタネート)を用いて作製し、これを多孔質PTFEフィルムの細孔内に含浸させた後、加熱する。この加熱によって、水と含フッ素界面活性剤が除去されるとともに、含フッ素側鎖を有するポリマーが溶融して多孔質PTFEフィルムの細孔内表面を連続気孔が維持された状態で被覆し、撥水性・撥油性の優れた通気膜が得られる。
気体吸着部材4は、上述したように、本発明の必須の構成ではないが、有害気体を吸着除去する必要に応じて場合により設けられる。気体吸着部材4に用いられる気体吸着剤としては、活性炭、シリカゲル、イオン交換樹脂などが用いられる。有機ガスの吸着には活性炭が適している。活性炭にアルカリ成分や酸成分を添着すると無機系ガスの吸着特性も付加できるので適宜用いるのが良い。
図5は、本発明の実施の形態2に係る通気フィルターの断面図である。本実施の形態では、流路部材2の表裏2つの主面のうち、気体吸着部材4に対向する流路部材2の第2主面(接着層1に対向する第1主面とは反対側)に凹部および/または凸部を設けることにより、流路部材2と気体吸着部材4の間に通気用の隙間を設けた構造である。気体吸着部材4の通気性が低い場合に、通気フィルターの圧力損失が高まってしまうのを防止するのに有効である。気体吸着部材4の表面(下面:第1主面)に沿って空気が流れるときに有害ガスが吸着されるため、有害ガス除去の観点でも有効である。凹部および/または凸部を形成することにより流路部材2と気体吸着部材4の間に形成する空間は、このような効果を有効に発揮させるため、流路部材2の1mm2あたり、0.02mm3以上(好ましくは0.1mm3以上)とすることが望ましい。流路部材2の凹凸形状は、射出成型でも切削加工によっても形成し得るが、生産効率の観点からは、射出成型を用いることが望ましい。
図6は、本発明の実施の形態3に係る通気フィルターの断面図である。本実施の形態では、気体吸着部材4の表裏2主面のうち、流路部材2に対向する第1主面(通気膜3に対向する第2主面とは反対側)に凹部および/または凸部を設けることにより、実施の形態2と同様に流路部材2と気体吸着部材4の間に通気用の隙間を設けた構造である。実施の形態2と同様に、気体吸着部材4の通気性が低い場合に有効である。この場合も気体吸着部材4の表面(下面)に沿って空気が流れるときに有害ガスが吸着されるため、有害ガス除去の観点でも有効である。流路部材2と気体吸着部材4の間に形成する空間は、このような効果を有効に発揮させるため、気体吸着部材4の1mm2あたり、0.02mm3以上(好ましくは0.1mm3以上)とすることが望ましい。気体吸着部材4の凹凸形成には、圧縮成型を用いることが望ましい。
図7は、本発明の実施の形態4に係る通気フィルターの断面図である。本実施の形態では、流路部材2と気体吸着部材4の間に通気部材6を狭持した構造である。通気部材6は、通気用の隙間を確保できる素材であり、好ましくは不織布やネット素材が使用できる。このとき、通気部材6を構成する素材に濾過特性を有するものを使えば、気体吸着部材4からの発塵が多い場合に、塵埃が流路2aへ移行して流路2aを詰まらせたり、通気フィルターの外へ流出したりするのを防ぐことができる。濾過特性を有する具体的な材料としては、多孔質樹脂フィルムやエレクトレット不織布やナノファイバー不織布などを用いることができる。本発明の実施の形態4に係る通気フィルターも、実施の形態2又は3と同様に気体吸着部材4の通気性が低い場合に有効であるが、実施の形態2又は3の場合に比べて、流路部材2や気体吸着部材4に凹凸を形成する工程が省けるほか、塵埃が通気膜3に到達するまでに捕集できるメリットがある。
図8は、本発明の実施の形態5に係る通気フィルターの断面図である。実施の形態5に係る通気フィルターは、基本的には実施の形態4に係る通気フィルターと同様の構成を有しているが、通気部材6が広めに形成されており、通気部材6の周縁部が、通気膜3の周縁部(鍔部3a)において通気膜3と接着層1との間に狭持されている。このような構造により、通気部材6を安定的に固定することができる。また、通気部材6の面内方向への気体の流通により、通気部材6が鍔部3aに接する部分においても気体流通が可能であるため、通気フィルターの圧力損失を低く抑えることができる。通気膜3にはある程度の強度が必要であるため、通気膜3の通気性を高くできない場合に有効である。
図9は、本発明の実施の形態6に係る通気フィルターの断面図である。本実施の形態に係る通気フィルターでは、気体吸着部材4と通気膜3との間に気体が透過できないバリア層7が形成されている。貫通孔1aから通気フィルターに流入する気体は、通気抵抗が最も低くなる経路で通気膜3に到達しようとするが、気体吸着部材4中を通過する距離が短くなるほど、有害気体が十分に除去できていない状態で通気膜3から筐体5内に透過してしまう。バリア層7は、気体をできるだけ長い経路で気体吸着部材4を横切らせようとする場合に有効である。このような効果を有効に発揮させるためには、流路部材2の開口部2bが気体吸着部材4の中央部に配置されていることが好ましい。有害気体を含む気体が、気体吸着部材4の幅の少なくとも1/2の距離に渡って気体吸着部材4中を透過するためである。なお、この通気フィルターにおいて、バリア層7と通気膜3との間に、さらに別の気体吸着部材を形成することが望ましい。図9のバリア層7を設けた場合、筐体5の内部(図9の上側)に存在するガスに対する吸着性能が低下するため、気体吸着部材4と、さらに別の気体吸着部材の二層の気体吸着部材にバリア層7が挟まれた構造にする方がより好ましい。
上記実施の形態1~6において、気体吸着部材4を使用した場合、従来はなかった課題が生じる。すなわち、流路部材2および気体吸着部材4は、いずれもある程度の剛性を有するため、もし流路部材2と気体吸着部材4との相対位置関係にずれが生じると、通気フィルターの気体吸着性能が低下したり、ばらついたり、或いは、通気膜3に破損を生ずる可能性がある。これを防止するため、流路部材2および/または気体吸着部材4に係合部を設けることにより流路部材2と気体吸着部材4を固定することが望ましい。係合部としては、例えば、流路部材2に凹部または凸部、気体吸着部材4に凸部または凹部を設ける方法がある。図10は、本発明の実施の形態7に係る通気フィルターの断面図であり、流路部材2に凸部、気体吸着部材4に凹部を設けた場合の例である。凸部の形状は、柱状、錐状、台形状など、種々の形態をとることができる。
図12は、参考例として示す通気フィルターの断面図である。この通気フィルターは容器状に形成された延伸多孔質PTFE膜に気体吸着剤を封入した気体吸着部材と、拡散流路を形成したプラスチック成型体8とを溶着により合体した構造である。この通気フィルターは、上記特許文献1に開示されている通気フィルターと比較するとプラスチックの使用量やプラスチックの露出面積は小さいものの、流路部材の側面は通気フィルター表面に露出しており、特許文献1に開示されている通気フィルターと同様に、バリ、切削屑、離型剤などが筐体内に飛散してしまう問題がある。
1a 貫通孔
2 流路部材
2a 流路
2b 開口部
3 通気膜
4 気体吸着部材
5 筐体
6 通気部材
7 バリア層
8 プラスチック成型体
Claims (19)
- 少なくとも1箇所に貫通孔を有する接着層と、前記貫通孔に連通する流路を備えた流路部材と、該流路部材を覆い、かつ前記接着層の一部も覆う通気膜とを有する通気フィルターであって、前記通気膜の周縁部が前記接着層に固定され、前記流路部材は、前記接着層と前記通気膜との間に形成される中空部内に保持されていることを特徴とする通気フィルター。
- 前記流路部材がプラスチック形成物である請求項1に記載の通気フィルター。
- 前記接着層に対向する前記流路部材の第1主面に溝が形成されており、該溝が前記流路部材の流路である請求項1または2に記載の通気フィルター。
- 前記流路部材と前記通気膜との間に気体吸着部材が形成されている請求項1~3のいずれかに記載の通気フィルター。
- 前記気体吸着部材に対向する前記流路部材の第2主面に凹部および/または凸部が形成されている請求項4に記載の通気フィルター。
- 前記流路部材に対向する前記気体吸着部材の第1主面に凹部および/または凸部が形成されている請求項4または5に記載の通気フィルター。
- 前記気体吸着部材と前記流路部材との間に通気部材が狭持されている請求項4~6のいずれかに記載の通気フィルター。
- 前記通気部材の周縁部が、前記通気膜の周縁部において前記通気膜と前記接着層との間に狭持されている請求項7に記載の通気フィルター。
- 前記気体吸着部材と前記通気膜との間にバリア層が形成されている請求項4に記載の通気フィルター。
- 前記バリア層と前記通気膜との間に、さらに気体吸着部材が形成されている請求項9に記載の通気フィルター。
- 前記流路部材および/または前記気体吸着部材に係合部が形成されている請求項1~10のいずれかに記載の通気フィルター。
- 前記通気膜がフッ素樹脂膜で構成されている請求項1~11のいずれかに記載の通気フィルター。
- 前記フッ素樹脂膜が多孔質ポリテトラフルオロエチレン膜で構成されている請求項12に記載の通気フィルター。
- 前記通気膜の表面に撥液剤を添加した請求項1~13のいずれかに記載の通気フィルター。
- 前記接着層が両面粘着テープである請求項1~14のいずれかに記載の通気フィルター。
- 前記通気膜の周縁部と接着層との接合面積が前記通気フィルターの底面積の0.15倍以上、0.8倍以下である請求項1~15のいずれかに記載の通気フィルター。
- 前記流路部材の厚さが0.3mm~5mmである請求項1~16のいずれかに記載の通気フィルター。
- 前記流路部材と前記気体吸着部材の間に空間が形成され、該空間の体積が前記流路部材の主面の面積1mm2あたり0.02mm3以上である請求項5~17のいずれかに記載の通気フィルター。
- 開口部を有する筐体と、該開口部を覆うように形成された請求項1~18のいずれかに記載の通気フィルターとを有する電気装置。
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Also Published As
Publication number | Publication date |
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EP2404652B1 (en) | 2017-05-17 |
CN102413898B (zh) | 2015-04-22 |
CA2754431C (en) | 2014-06-03 |
JP2010207663A (ja) | 2010-09-24 |
US20120060693A1 (en) | 2012-03-15 |
CA2754431A1 (en) | 2010-09-10 |
CN102413898A (zh) | 2012-04-11 |
EP2404652A1 (en) | 2012-01-11 |
US8568503B2 (en) | 2013-10-29 |
AU2010219775B2 (en) | 2013-11-07 |
KR20120002988A (ko) | 2012-01-09 |
AU2010219775A1 (en) | 2011-10-20 |
KR101624766B1 (ko) | 2016-05-26 |
EP2404652A4 (en) | 2013-06-19 |
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